Nickel Strip Battery Tab for Spot Welding is a widely used metal connection component for cylindrical lithium battery pack assembly. It is designed to connect individual battery cells, create series and parallel electrical paths, and provide a practical surface for resistance spot welding. Nickel Strips and nickel battery tabs are commonly used with cylindrical battery formats such as 18650 and 21700, while other sizes can also be accommodated through customized dimensions, hole patterns, lengths, and stamped configurations.
For battery pack manufacturers, DIY battery builders, electronics assemblers, energy storage integrators, and electrical equipment designers, selecting an appropriate nickel strip battery tab is an important part of battery interconnection design. The material, thickness, width, tab geometry, punching dimensions, welding method, current requirement, and cell configuration can all influence the suitability of a battery connector strip.
Nickel battery tabs are generally available in two major material categories: nickel plated steel strip and pure nickel strip. Nickel plated steel strip normally uses SPCC low carbon cold rolled steel as the substrate and a nickel plated surface as the conductive and protective layer. It is often selected as an economical option for general battery pack assembly. Pure nickel strip is made from nickel material and is commonly selected where low electrical resistance, corrosion resistance, and reliable welding performance are important.
The term Nickel Strip Battery Tab can describe a flat strip, pre-cut connector, punched battery tab, stamped connection piece, or customized battery interconnect. Depending on the battery pack structure, the tab can be supplied in continuous coils, cut lengths, or pre-formed pieces.
This guide explains the definition, material options, common dimensions, punching hole sizes, battery applications, welding considerations, design factors, advantages, product forms, and selection principles associated with nickel strip battery tabs for spot welding.
A nickel strip battery tab is a thin metal connector used to establish electrical and mechanical connections between battery cells. In cylindrical lithium battery packs, the strip is normally positioned across the positive or negative terminal areas of adjacent cells and joined by resistance spot welding.
Unlike ordinary metal sheet, a battery nickel strip is designed around the practical requirements of battery interconnection. It needs to provide sufficient electrical conductivity while also allowing the welding equipment to create a secure connection without unnecessarily damaging the cell.
A battery tab can be manufactured as a straight strip or as a punched and stamped component. A straight strip is useful when the battery pack configuration requires flexible cutting and forming during assembly. A pre-punched or pre-stamped nickel tab can improve positioning consistency when a particular cell holder, battery layout, or connection pattern is repeatedly produced.
Nickel strips are particularly common in cylindrical battery pack construction because their flat geometry makes them easy to position across multiple cells. The strip can be arranged to create series connections, parallel connections, or combinations of both.
For example, a battery pack may use nickel tabs to connect cells in a series arrangement. In another design, several cells may first be connected in parallel and then connected to another parallel group in series. The required nickel strip configuration changes according to the number of cells, current path, physical layout, and welding process.
Resistance spot welding is widely used for joining battery tabs to cylindrical cells because it can create a localized connection without requiring the entire cell terminal to be heated for an extended period.
A nickel strip provides a convenient welding surface between the cell terminal and the external battery circuit. The welding process creates localized weld points that secure the tab to the terminal.
A suitable battery nickel strip should provide several useful characteristics:
Good electrical conductivity
Appropriate electrical resistance
Stable mechanical structure
Suitable welding behavior
Consistent thickness
Consistent width
Accurate dimensional tolerance
Good corrosion resistance
Suitable flexibility for battery assembly
Compatibility with the selected welding process
The exact requirements depend on the battery pack design. A small low-current battery pack may have different requirements from a high-power battery system.
The thickness of the strip is especially important. A thicker strip can provide a larger conductive cross section, but thickness alone does not determine the current capability of a battery connection. Material type, strip width, connection length, weld quality, electrical resistance, thermal conditions, and the complete current path must also be considered.
Common Materials for Nickel Battery Tabs
Two commonly discussed material categories are nickel-plated steel strip and pure nickel strip.
Nickel-plated steel strip generally uses SPCC low carbon cold rolled steel as its base material. A nickel coating is applied to the surface of the steel strip.
This construction is widely used where an economical battery connection material is desired. The steel substrate provides mechanical strength, while the nickel surface provides a conductive and corrosion-resistant surface suitable for many battery connection applications.
Nickel-plated steel strips are commonly supplied in continuous rolls and can subsequently be slit, cut, punched, or stamped.
When the large nickel-plated coil is processed into narrow strips, the side edges of the finished strip may not have a nickel plating layer. This is an important manufacturing characteristic to understand when evaluating the material structure.
Nickel-plated steel can be used for various general battery pack applications, including cylindrical lithium battery assemblies.
Pure nickel strip is a different material category. It is made from nickel rather than using steel as the main substrate.
A commonly specified grade for battery applications is N6 or Ni200, with nickel content generally specified at Ni ≥ 99.6%.
Pure nickel strips are often selected for applications where low electrical resistance, good corrosion resistance, and reliable spot welding characteristics are important.
Compared with nickel-plated steel, pure nickel generally has different electrical and mechanical properties. Therefore, material selection should be based on the actual battery design rather than simply assuming that a thicker strip is always better.
| Item | Nickel Plated Steel Strip | Pure Nickel Strip |
|---|---|---|
| Base Material | SPCC low carbon steel | Nickel |
| Nickel Content | Nickel coating on steel | Ni ≥ 99.6% for commonly specified grades |
| Cost Position | Economical option | Generally higher material cost |
| Mechanical Strength | Good | Good |
| Electrical Resistance | Depends on construction and dimensions | Low electrical resistance |
| Corrosion Resistance | Provided by nickel surface | Good inherent corrosion resistance |
| Spot Welding | Suitable for many battery assemblies | Excellent suitability for many battery welding applications |
| Typical Use | General battery packs and cost-sensitive designs | Higher-performance battery connections |
| Processing | Slitting, cutting, punching, stamping | Slitting, cutting, punching, stamping |
| Supply Form | Coil, strip, tab | Coil, strip, tab |
| Customization | Available | Available |
Material selection should always be evaluated together with battery current, pack configuration, welding equipment, tab geometry, thermal conditions, and required service life.
Common Specifications
The following specifications are commonly considered when selecting a Nickel Strip Battery Tab for Spot Welding.
Nickel-plated steel strip: SPCC substrate with nickel plating, commonly selected as an economical option.
Pure nickel strip: Ni ≥ 99.6%, commonly selected for applications requiring low resistance and higher current capability.
0.12 mm / 0.15 mm: Commonly used for 1P series connection configurations.
0.15 mm / 0.2 mm: Commonly used for 2P or higher parallel connection tabs.
0.3 mm: Can be used for high-power battery pack applications when the complete design requires a thicker connection strip.
For 18650 battery models, a square punching hole is approximately:
11.5–12 × 12 mm
For 21700 battery models, a square punching hole is approximately:
13.5–14.5 × 14.5 mm
These dimensions should be treated as common reference dimensions rather than universal standards. Actual hole dimensions can vary according to the battery holder, cell arrangement, tab design, welding position, and assembly requirements.
Nickel Strip Thickness Selection
Thickness is one of the most important parameters when designing a battery tab.
A thin nickel strip may be appropriate for a compact, low-current connection. A thicker strip can provide a larger cross-sectional area and may be preferred for higher-current applications.
However, battery designers should not determine current capability based only on thickness. The following factors should be evaluated together:
Strip material
Strip thickness
Strip width
Connection length
Number of parallel strips
Number of weld points
Battery cell characteristics
Operating current
Peak current
Temperature rise
Welding quality
Battery pack structure
For example, a 0.15 mm strip with a wider geometry may perform differently from a narrow 0.15 mm strip. Similarly, two parallel connection strips may provide a different current path from a single strip.
The commonly used 0.12 mm, 0.15 mm, 0.2 mm, and 0.3 mm thickness options provide a practical range for many cylindrical battery pack designs.
0.12 mm Nickel Strip Battery Tab
A 0.12 mm nickel strip is a relatively thin battery connection material. It is commonly considered for compact battery pack structures and 1P series connection applications.
The thin profile allows the strip to remain relatively flexible and easy to position. It can be useful when the battery pack design has limited space around the cell terminals.
A 0.12 mm strip may also be easier to form around certain battery structures. However, the actual suitability depends on the required current and connection geometry.
Typical applications may include:
Compact cylindrical battery packs
1P battery connections
Small electronic devices
Low to moderate current battery assemblies
Prototype battery packs
Lightweight battery assemblies
The final specification should be confirmed through electrical and thermal evaluation.
0.15 mm Nickel Strip Battery Tab
A 0.15 mm nickel strip is one of the commonly used thicknesses for cylindrical lithium battery pack assembly.
It can be used for 18650 battery configurations and is also applicable to many 21700 battery designs.
The 0.15 mm thickness provides a balance between flexibility, mechanical strength, welding behavior, and electrical connection requirements.
Typical applications include:
18650 battery packs
21700 battery packs
1P series connections
2P parallel connections
DIY battery packs
Portable power packs
Electronic equipment battery packs
General lithium battery assemblies
As with all battery interconnect materials, the final application should determine whether the selected thickness is adequate.
0.2 mm Nickel Strip Battery Tab
A 0.2 mm nickel strip provides a thicker connection path than 0.12 mm and 0.15 mm material.
It is commonly considered for 2P or higher parallel connection configurations and for applications where a more substantial connection path is required.
Typical applications include:
Parallel battery groups
Higher-current battery assemblies
Larger cylindrical battery packs
21700 battery pack construction
Energy storage battery packs
Power equipment battery packs
The actual electrical performance depends on the complete strip design rather than thickness alone.
0.3 mm Nickel Strip Battery Tab
A 0.3 mm nickel strip is a relatively thick battery connection option.
It can be used for high-power battery pack designs where the mechanical and electrical design requires a thicker metal interconnect.
Because thicker battery tabs can require different welding parameters, the welding process should be evaluated carefully before mass production.
Potential applications include:
High-power battery packs
Power battery assemblies
High-current battery connections
Heavy-duty battery interconnects
Large cylindrical cell packs
Specialized energy storage systems
18650 Nickel Strip Battery Tab
The 18650 cylindrical battery cell is one of the most widely recognized cylindrical cell formats.
An 18650 battery pack can contain cells connected in series, parallel, or a combination of both.
Nickel strip battery tabs can be used to connect these cells by resistance spot welding.
For 18650 applications, a common punched square hole size is approximately:
11.5–12 × 12 mm
The exact hole dimension should be adjusted according to the actual battery holder and mechanical configuration.
Common 18650 nickel strip applications include:
18650 lithium battery packs
Rechargeable battery packs
Portable power systems
Power tools
Electronic equipment
DIY battery packs
Battery prototypes
Energy storage assemblies
A pre-punched nickel tab can help standardize the position of the connection area when a battery pack uses a repeated cell arrangement.
21700 Nickel Strip Battery Tab
The 21700 cylindrical battery format has become widely used in various high-capacity and high-power battery applications.
Compared with 18650 cells, 21700 cells have a larger physical diameter, so the connection tab geometry may need to be adjusted.
A commonly referenced square punching hole size for 21700 nickel tabs is approximately:
13.5–14.5 × 14.5 mm
This dimension is a reference range and should be customized when the actual battery pack structure requires a different opening.
21700 nickel strip applications include:
21700 lithium battery packs
Electric mobility battery packs
Energy storage systems
Power tool batteries
Portable power stations
High-capacity battery assemblies
DIY battery packs
Battery module prototypes
Nickel Strip Punching and Stamping
Battery nickel strips can be supplied as plain strips or processed into punched and stamped tabs.
Punching is used to create specific openings or connection geometries in the metal strip.
Stamping can produce more complex shapes, including:
Square holes
Round holes
Slotted holes
Offset connection tabs
Extended tabs
Folded tabs
Shaped battery connectors
Custom battery interconnects
Pre-punched nickel battery tabs can simplify assembly when the battery pack has a standardized structure.
For large-scale production, customized stamping can also help improve repeatability and reduce manual cutting operations.
Purpose of Punching Holes in Nickel Battery Tabs
A punching hole can serve several purposes depending on the battery pack design.
It may be used to:
Match a cell holder structure
Reduce unnecessary material
Provide clearance around a battery component
Improve positioning
Create a defined welding area
Match a battery pack fixture
Reduce interference between adjacent components
Improve mechanical assembly
Support a customized connection layout
The hole shape and dimensions should be designed around the actual battery pack.
The commonly referenced dimensions of approximately 11.5–12 × 12 mm for 18650 models and 13.5–14.5 × 14.5 mm for 21700 models provide useful starting points, but they should not be assumed to fit every battery holder or battery design.
Series Connection and Parallel Connection
Nickel strips are used in both series and parallel battery configurations.
In a series connection, battery cells are electrically connected so that their voltages add together.
For example, a battery pack may use nickel tabs to connect the positive terminal of one cell to the negative terminal of the next cell.
For 1P series configurations, 0.12 mm and 0.15 mm nickel strips are commonly used depending on the electrical requirements.
The actual strip specification should be determined by the battery current, cell characteristics, welding design, and pack configuration.
In a parallel connection, multiple cells are connected to increase available capacity and current capability.
For 2P or higher parallel configurations, 0.15 mm and 0.2 mm strips are commonly considered.
The number of parallel cells can significantly influence the required connection design.
For high-power applications, a 0.3 mm strip may be considered when appropriate.
Nickel Strip for Battery Pack Assembly
Battery pack assembly requires a reliable electrical connection between cells and external circuits.
A nickel strip can function as an interconnect between cylindrical cells and can also serve as the interface between the battery cells and other electrical components.
A typical assembly may include:
Cylindrical battery cells
Cell holders or structural components
Nickel battery tabs
Resistance spot welds
Battery management system components
External wires
Protective enclosure
The nickel strip is only one component of the complete battery pack system. Electrical safety and mechanical integrity depend on the entire assembly.
Nickel Strip and Resistance Spot Welding
Resistance spot welding is a localized joining process.
The welding electrodes contact the nickel strip and battery terminal, and electrical current passes through the welding area. Localized resistance generates heat, forming weld points between the tab and terminal.
The welding process must be matched to the material and thickness.
Important welding parameters include:
Welding current
Welding time
Pulse duration
Electrode pressure
Electrode geometry
Number of weld points
Tab thickness
Battery terminal condition
Surface condition
Welding machine characteristics
The correct welding parameters vary from one application to another.
A production process should be validated using representative cells and the actual nickel strip specification.
Advantages of Nickel Strip Battery Tabs
Nickel strip is widely used as a conductive connection material in battery assemblies.
Pure nickel is particularly valued for its relatively low electrical resistance.
Nickel strips are commonly used with resistance spot welding equipment.
A properly selected strip can provide a practical welding interface while avoiding unnecessary heat exposure to the battery cell.
Nickel strips can be:
Slit
Cut
Punched
Stamped
Formed
Customized
This makes them suitable for both simple and complex battery pack configurations.
Common thicknesses such as 0.12 mm, 0.15 mm, 0.2 mm, and 0.3 mm allow designers to select different connection structures.
The strip width can be customized according to cell arrangement and required electrical connection area.
Continuous coil material is convenient for manufacturing, while pre-cut tabs can be convenient for manual or small-batch assembly.
Punched and stamped nickel tabs can be designed for particular battery holders and cell layouts.
Nickel Strip Battery Tab Specification Table
| Specification | Common Option | Application Reference |
|---|---|---|
| Material | Nickel Plated Steel | Economical battery connection |
| Material | Pure Nickel | Low resistance and higher current applications |
| Pure Nickel Grade | N6 or Ni200 | Common pure nickel specification |
| Nickel Content | ≥ 99.6% | Pure nickel reference |
| Thickness | 0.12 mm | Common 1P series connection |
| Thickness | 0.15 mm | 1P and general battery connections |
| Thickness | 0.2 mm | 2P or higher parallel connections |
| Thickness | 0.3 mm | High-power battery packs |
| Battery Cell | 18650 | Cylindrical lithium battery |
| Battery Cell | 21700 | Cylindrical lithium battery |
| 18650 Hole | Approximately 11.5–12 × 12 mm | Punched battery tab reference |
| 21700 Hole | Approximately 13.5–14.5 × 14.5 mm | Punched battery tab reference |
| Form | Coil | Continuous processing |
| Form | Cut Strip | Manual or production assembly |
| Form | Punched Tab | Repeated battery layouts |
| Form | Stamped Connector | Customized battery assembly |
Nickel Strip Width Selection
Thickness is only one dimension of a battery tab. Width is equally important when designing an electrical connection.
A wider strip provides a larger cross-sectional area and may be useful where a larger conductive path is required.
Narrow strips may be preferred when:
Space is limited
Cells are closely arranged
A small connection area is required
The pack structure requires narrow tabs
The welding equipment is designed for narrow strips
Wider strips may be preferred when:
Higher current is required
A larger connection area is needed
Multiple cells are connected
The battery pack has sufficient physical space
Custom slitting can produce different strip widths according to the battery pack design.
Nickel Strip Length
The length of a battery nickel strip depends on the distance between connection points and the battery pack structure.
Short tabs can be used for closely positioned cells.
Longer strips may be required when cells are arranged in multiple rows or when the electrical path extends across several cells.
Custom cut lengths can help reduce material waste and improve assembly efficiency.
Common supply forms include:
Continuous coils
Fixed-length strips
Individual battery tabs
Pre-punched pieces
Custom stamped connectors
Nickel Strip Coil
Nickel strip coils are convenient for continuous production.
A coil can be processed through slitting, cutting, punching, and stamping equipment.
Coil supply is commonly used when battery manufacturers need large quantities of consistent strip material.
Advantages of coil supply include:
Continuous processing
Reduced manual cutting
Consistent dimensions
Efficient material handling
Suitable for automated production
Flexible downstream processing
The exact coil dimensions depend on the manufacturing requirements.
Pre-Cut Nickel Battery Tabs
Pre-cut tabs are suitable when the required battery connection length is already known.
They can be produced according to:
Length
Width
Thickness
Hole size
Hole position
Tab shape
Quantity
Battery cell format
Pre-cut nickel tabs can simplify manual battery pack assembly.
Pre-Punched Nickel Battery Tabs
Pre-punched battery tabs are designed with openings or specific geometric features.
For 18650 battery assemblies, a square hole around 11.5–12 × 12 mm may be used as a reference.
For 21700 battery assemblies, a square hole around 13.5–14.5 × 14.5 mm may be used as a reference.
The actual dimensions should be verified against the cell holder and mechanical assembly.
Custom Nickel Strip Battery Tabs
Custom battery tabs are useful when standard straight strips cannot satisfy the requirements of a particular battery pack.
Customization can include:
Custom thickness
Custom width
Custom length
Custom hole size
Custom hole position
Custom hole shape
Custom tab shape
Custom stamping
Custom bending
Custom connection pattern
Custom nickel tabs can be designed around 18650, 21700, and other cylindrical cell configurations.
Nickel Strip for 18650 Battery Packs
The 18650 format is frequently used in battery packs containing multiple cylindrical cells.
Nickel strips can connect cells in different configurations.
For example:
1P: Cells are connected in series without multiple cells in parallel at each position.
2P: Two cells are connected in parallel at each position.
3P: Three cells are connected in parallel at each position.
Higher parallel configurations are also possible.
As the number of parallel cells increases, the battery connection design must account for the combined electrical current path.
The nickel tab thickness, width, number of strips, and welding pattern should be evaluated together.
Nickel Strip for 21700 Battery Packs
21700 battery packs use larger cylindrical cells than 18650 packs.
This difference affects the mechanical dimensions of the nickel tab.
The approximate 21700 square punching hole reference of 13.5–14.5 × 14.5 mm can be used when developing a customized punched tab, but the final size should correspond to the actual battery holder and assembly structure.
21700 nickel strips are commonly used in:
High-capacity battery packs
Power tool battery systems
Portable power systems
Energy storage packs
Electric mobility systems
Prototype battery assemblies
Nickel Strip for Energy Storage Battery Packs
Energy storage battery packs may contain large numbers of cylindrical cells.
Nickel tabs can be used to connect individual cells into larger battery modules.
The requirements for energy storage applications can vary considerably. A compact low-power storage unit and a high-power storage system may require different interconnection structures.
When selecting nickel strip for energy storage, designers should evaluate:
Continuous current
Peak current
Operating temperature
Number of parallel cells
Number of series cells
Strip dimensions
Weld structure
Mechanical support
Insulation
Thermal management
The nickel strip should be considered as part of the complete electrical path.
Nickel Strip for Power Battery Applications
Power battery systems typically require carefully designed electrical connections.
For high-power applications, a thicker nickel strip such as 0.3 mm may be considered when compatible with the battery architecture and welding process.
However, a thicker strip does not automatically mean a higher allowable current.
The complete connection system determines the actual performance.
Factors include:
Material resistivity
Strip dimensions
Weld resistance
Number of weld points
Cell terminal resistance
Connection length
Thermal environment
Battery operating current
Nickel Strip for DIY Battery Packs
DIY battery packs often use 18650 or 21700 cylindrical cells.
Nickel strip is popular for DIY battery pack assembly because it can be cut and positioned relatively easily and can be joined using suitable spot welding equipment.
DIY battery builders commonly select:
0.12 mm nickel strip
0.15 mm nickel strip
0.2 mm nickel strip
Pre-cut nickel tabs
Punched nickel tabs
However, battery pack construction involves significant electrical and fire safety considerations. Appropriate cell matching, insulation, protection circuitry, welding procedures, and enclosure design are essential.
Nickel Strip for Battery Connector Applications
A battery connector tab creates an electrical path between battery cells and other components.
Nickel strips can be used as:
Cell-to-cell connectors
Series connection tabs
Parallel connection tabs
Battery module connectors
Battery pack interconnects
Terminal connection pieces
The exact connector geometry depends on the battery architecture.
Nickel Strip and Battery Cell Holders
Battery holders can influence the geometry of the nickel tab.
When a cell holder has a specific slot or opening, the nickel strip may require a corresponding punched hole.
This is why hole dimensions should not be selected solely based on the nominal cell diameter.
The following should be considered:
Actual cell dimensions
Holder dimensions
Holder tolerance
Tab width
Tab position
Weld location
Insulation clearance
Mechanical movement
For this reason, a custom punched nickel strip is often preferable for repeated production.
Nickel Strip Battery Tab Design Considerations
A practical battery tab design should consider both electrical and mechanical requirements.
Electrical factors include:
Current
Resistance
Conductivity
Connection length
Cross-sectional area
Number of parallel paths
Weld resistance
Mechanical factors include:
Strip thickness
Strip width
Flexibility
Hole location
Tab length
Battery holder structure
Vibration
Assembly tolerance
Manufacturing factors include:
Coil processing
Slitting accuracy
Cutting accuracy
Punching tolerance
Stamping quality
Burr control
Surface condition
Dimensional consistency
Nickel Strip Burr Control
Punching and stamping can produce burrs along the edges of holes.
Excessive burrs may affect:
Assembly
Insulation
Mechanical clearance
Operator handling
Tab positioning
Therefore, punched battery tabs should be produced with appropriate tooling and process control.
The required burr specification depends on the application and assembly process.
Nickel Strip Surface Quality
Surface condition can affect welding performance.
A consistent surface can help maintain stable contact between the welding electrode, nickel tab, and battery terminal.
Important surface considerations include:
Cleanliness
Plating condition
Surface flatness
Oxidation
Contamination
Scratches
Burrs
For production battery assemblies, consistent surface quality is particularly important.
Nickel Strip Welding Area
The welding area should provide enough material for the required weld points.
If the tab is too narrow, the welding area may become constrained.
If the tab is excessively wide, it may interfere with other components or create unnecessary material usage.
A balanced tab design should provide adequate welding space while fitting the physical battery pack.
Nickel Strip Weld Point Arrangement
The number and arrangement of weld points depend on the battery tab design and welding process.
A battery tab may use multiple weld points to create a stable mechanical and electrical connection.
The welding pattern should be validated according to:
Tab material
Tab thickness
Cell terminal material
Welding current
Welding pulse
Electrode size
Required connection strength
A controlled welding process is essential for consistent battery assembly.
Common Nickel Strip Applications
| Application | Common Battery Format | Typical Nickel Strip Consideration |
|---|---|---|
| DIY Battery Pack | 18650 | 0.12 to 0.2 mm commonly considered |
| Portable Power | 18650 or 21700 | 0.15 to 0.2 mm commonly considered |
| Power Tool Battery | 18650 or 21700 | Material and current path should be evaluated |
| Energy Storage | 18650 or 21700 | Parallel connection design is important |
| High Power Pack | 21700 or other formats | Thicker or multiple connection paths may be considered |
| Battery Prototype | 18650 or 21700 | Custom cut and punched tabs |
| Battery Module | Multiple cylindrical cells | Custom geometry |
| Battery Assembly | Various | Coil or pre-cut strip |
Common Product Forms
Nickel battery tabs can be supplied in several forms.
Continuous nickel strip is suitable for automated or semi-automated processing.
Fixed-length strips are convenient for manual assembly and standardized battery pack production.
Punched tabs contain predefined holes or openings.
Stamped tabs can have more complex shapes.
Custom connector pieces can be produced according to a battery pack drawing or sample.
How to Select Nickel Strip for Spot Welding
Selecting a suitable nickel strip should begin with the battery cell type.
Determine whether the battery uses:
18650
21700
26650
26700
32650
Another cylindrical cell
Identify whether the pack is:
1P
2P
3P
4P
Higher parallel configuration
Consider:
Continuous current
Peak current
Voltage
Battery capacity
Operating conditions
Choose between nickel-plated steel and pure nickel according to the required performance and cost structure.
Common reference options include:
0.12 mm
0.15 mm
0.2 mm
0.3 mm
The strip width should match the electrical and mechanical requirements.
For 18650 designs, approximately 11.5–12 × 12 mm can be used as a reference.
For 21700 designs, approximately 13.5–14.5 × 14.5 mm can be used as a reference.
The selected nickel strip should be tested using the intended welding equipment and battery cell.
Nickel Strip Selection Guide
| Battery Configuration | Common Thickness Reference | Material Options | Typical Form |
|---|---|---|---|
| 1P Series | 0.12 mm | Nickel plated steel or pure nickel | Strip or punched tab |
| 1P Series | 0.15 mm | Nickel plated steel or pure nickel | Strip or punched tab |
| 2P Parallel | 0.15 mm | Nickel plated steel or pure nickel | Strip or punched tab |
| 2P Parallel | 0.2 mm | Nickel plated steel or pure nickel | Strip or punched tab |
| Higher Parallel | 0.2 mm | Material selected according to design | Custom tab |
| High Power Pack | 0.3 mm | Pure nickel or nickel plated steel depending on design | Custom strip or tab |
| 18650 Punched Tab | 0.12 to 0.2 mm | Both options | Approx. 11.5–12 × 12 mm reference hole |
| 21700 Punched Tab | 0.15 to 0.3 mm | Both options | Approx. 13.5–14.5 × 14.5 mm reference hole |
These are general industry reference ranges, not universal engineering standards.
Nickel Strip for Battery Welding Machines
Nickel strips are commonly processed using battery spot welding equipment.
Different welding machines can have different output characteristics. Therefore, the same nickel strip may require different welding parameters on different equipment.
Before mass production, manufacturers should perform sample welding tests.
A good welding validation process can include:
Visual inspection
Weld consistency inspection
Mechanical pull testing where appropriate
Electrical resistance evaluation
Temperature evaluation
Battery cell inspection
Repeated welding testing
Nickel Strip Quality Control
Quality control is important for battery connection materials.
Typical quality control areas include:
Thickness measurement
Width measurement
Length measurement
Hole dimension inspection
Hole position inspection
Surface inspection
Plating inspection
Burr inspection
Flatness inspection
Material verification
Welding performance testing
For custom punched tabs, dimensional consistency is especially important.
Nickel Strip Thickness Tolerance
Thickness tolerance affects both the electrical characteristics and welding process.
If the actual thickness varies significantly, welding conditions may become less consistent.
For this reason, production nickel strip should have controlled thickness and width.
The required tolerance depends on:
Product specification
Welding process
Battery design
Production equipment
Required assembly accuracy
Nickel Strip Width Tolerance
Width tolerance is important when the strip must fit a narrow battery pack.
A wider-than-required strip may interfere with neighboring components.
A narrower-than-required strip may reduce the intended connection area.
Precision slitting can be used when a specific width is required.
Nickel Strip for Automated Battery Assembly
Automated battery production may require continuous strip material or precisely punched components.
Coil material can be fed into automated processing equipment.
Pre-punched tabs can also be used in automated or semi-automated assembly systems.
Important characteristics for automation include:
Consistent dimensions
Stable material thickness
Consistent surface condition
Controlled burrs
Accurate punching
Repeatable tab geometry
Stable feeding performance
Nickel Strip for Battery Pack Prototyping
Prototype battery packs often require flexible material choices.
Continuous nickel strip allows engineers to cut and test different connection patterns.
Pre-punched tabs can be useful when the final battery configuration is already established.
For prototype development, it is helpful to test different:
Materials
Thicknesses
Widths
Hole sizes
Weld patterns
Tab lengths
This allows the final battery interconnect design to be optimized before mass production.
Pure Nickel Strip vs Nickel Plated Steel Strip
The choice between pure nickel and nickel-plated steel depends on application requirements.
Pure nickel is often selected when electrical performance and low resistance are important.
Nickel-plated steel is frequently selected when cost efficiency, mechanical strength, and general battery assembly performance are priorities.
Neither material is automatically suitable for every battery application.
The selection should consider the complete electrical system and welding process.
Economic Considerations
Material cost is one factor in nickel strip selection.
Nickel-plated steel can provide an economical alternative for many general battery applications.
Pure nickel usually has a higher material cost, but it can provide desirable electrical and corrosion characteristics.
The best choice depends on the balance between:
Material cost
Electrical performance
Mechanical requirements
Welding performance
Production volume
Battery service requirements
Custom Nickel Strip Dimensions
Custom battery tabs can be produced according to a required drawing.
Possible custom parameters include:
| Parameter | Customization |
|---|---|
| Material | Nickel plated steel or pure nickel |
| Thickness | Custom specification |
| Width | Custom specification |
| Length | Custom specification |
| Hole Shape | Square, round, slot, or custom |
| Hole Size | Custom |
| Hole Position | Custom |
| Tab Shape | Custom |
| Stamping Pattern | Custom |
| Packaging | Coil, strip, or counted pieces |
Customized dimensions can help battery manufacturers reduce unnecessary material processing during assembly.
Packaging and Handling
Nickel strip should be protected from contamination and physical deformation during transportation and storage.
Coils should be packaged to prevent:
Scratches
Crushing
Bending
Contamination
Moisture exposure
Uncontrolled deformation
Pre-cut battery tabs should be packaged to prevent mixing of different dimensions.
Clear labeling can identify:
Material
Thickness
Width
Length
Battery model
Batch information
Quantity
Storage of Nickel Battery Tabs
Nickel strips should be stored in a clean and dry environment appropriate for metal materials.
The storage area should minimize exposure to:
Excessive moisture
Dust
Chemical contamination
Mechanical damage
The surface should remain clean before welding.
Nickel Strip for 18650 and 21700 Battery Packs
The following comparison provides a practical overview.
| Feature | 18650 Battery Pack | 21700 Battery Pack |
|---|---|---|
| Cell Format | 18650 | 21700 |
| Common Use | Compact battery packs | Higher-capacity cylindrical battery packs |
| Reference Hole Size | 11.5–12 × 12 mm | 13.5–14.5 × 14.5 mm |
| Common Thickness | 0.12 / 0.15 / 0.2 mm | 0.15 / 0.2 / 0.3 mm |
| Tab Type | Straight or punched | Straight or punched |
| Connection | Series or parallel | Series or parallel |
| Customization | Width, length, hole, shape | Width, length, hole, shape |
The values shown are common reference specifications and should be adjusted to the actual battery pack design.
Common Problems When Selecting Nickel Strip
Thickness should not be selected solely based on the physical appearance of the strip.
Current requirements and the complete connection path must be considered.
A narrow strip and wide strip with the same thickness do not have identical cross-sectional areas.
A material may be suitable in principle but require different welding parameters.
Battery holders and pack structures vary. The approximate 11.5–12 × 12 mm hole dimension is a reference rather than a universal requirement.
The approximate 13.5–14.5 × 14.5 mm dimension is also a reference. Actual battery assembly dimensions may differ.
Material cost should be considered together with electrical and mechanical requirements.
Nickel Strip Battery Tab for Professional Battery Assembly
Professional battery assembly typically requires consistent material properties and dimensions.
A production-oriented nickel strip specification may include:
Material grade
Thickness
Thickness tolerance
Width
Width tolerance
Surface finish
Hole size
Hole tolerance
Hole position
Burr requirement
Coil dimensions
Packaging requirement
A clear specification helps ensure that the nickel strip performs consistently during production.
Nickel Strip Battery Tab for Low Current Applications
For lower-current applications, a thinner nickel strip may be appropriate if the electrical and thermal requirements permit.
A 0.12 mm strip can be considered for some 1P series connections.
However, current requirements should always be confirmed before selecting the final material.
Applications can include:
Small electronic devices
Compact rechargeable products
Low-power battery packs
Small prototype assemblies
Nickel Strip Battery Tab for Higher Current Applications
Higher-current battery packs may require:
Thicker nickel strips
Wider nickel strips
Multiple parallel connection paths
More weld points
Optimized connection geometry
A 0.2 mm or 0.3 mm strip may be considered depending on the design.
Pure nickel can also be selected when low electrical resistance is a key requirement.
The actual current capability must be validated through engineering calculations and testing.
Nickel Strip and Battery Safety
Battery interconnection design should always prioritize electrical and mechanical safety.
A nickel tab should not create unintended short circuits.
Adequate insulation and spacing should be maintained around the battery terminals and connection tabs.
Battery pack designers should consider:
Short-circuit protection
Insulation
Cell spacing
Weld quality
Mechanical protection
Thermal management
Battery management system requirements
Proper assembly procedures
The nickel strip itself is only one part of the complete safety system.
Nickel Strip Battery Tab Manufacturing Process
A typical manufacturing sequence may include:
The selected nickel strip material is prepared in coil form.
Large-width material can be slit into narrower strips.
The strip can be cut into specified lengths.
Specific holes or openings can be punched.
More complex tab shapes can be formed.
Dimensions, surface condition, and geometry are inspected.
Finished nickel tabs are packed according to production requirements.
Applications by Battery Type
| Battery Type | Nickel Strip Application |
|---|---|
| 18650 | Battery pack connection and spot welding |
| 21700 | Battery pack connection and spot welding |
| 26650 | Cylindrical cell connection |
| 26700 | Cylindrical battery pack connection |
| 32650 | Larger cylindrical battery assembly |
| Rechargeable Battery | Battery interconnect |
| Energy Storage Battery | Parallel and series connection |
| Power Battery | High-power connection design |
| Portable Power Battery | Compact battery assembly |
| DIY Battery | Custom battery pack welding |
Frequently Asked Questions
A Nickel Strip Battery Tab is a thin metal connector used to electrically and mechanically connect battery cells, particularly cylindrical lithium battery cells. It is commonly joined to cell terminals using resistance spot welding.
Common options include nickel-plated steel strip using an SPCC substrate and pure nickel strip with nickel content of at least 99.6% for commonly specified pure nickel grades.
Common options include 0.12 mm and 0.15 mm, with 0.2 mm also used for certain connection structures.
Common options include 0.15 mm and 0.2 mm, while 0.3 mm can be considered for certain high-power battery pack designs.
A common reference is approximately 11.5–12 × 12 mm for a square hole.
A common reference is approximately 13.5–14.5 × 14.5 mm for a square hole.
Yes. Nickel strips can be customized in thickness, width, length, punching pattern, hole dimensions, hole position, and tab shape.
Yes. Continuous nickel strip is commonly supplied in coil or roll form.
Yes. Nickel strips can be cut into fixed-length pieces or processed into pre-punched and stamped battery tabs.
No. Nickel-plated steel uses a steel substrate with a nickel surface coating, while pure nickel strip is made primarily from nickel.
No. Thickness should be selected according to current requirements, connection geometry, welding capability, mechanical design, and thermal requirements.
Conclusion
Nickel Strip Battery Tab for Spot Welding is an important interconnection material for cylindrical battery pack assembly. It can be used for 18650, 21700, 26650, 26700, 32650, and other cylindrical battery formats.
The two major material options are nickel-plated steel strip and pure nickel strip. Nickel-plated steel using an SPCC substrate provides an economical option for many general battery assemblies, while pure nickel with Ni ≥ 99.6% is commonly considered when low electrical resistance and higher-current performance are important.
Common thicknesses include 0.12 mm, 0.15 mm, 0.2 mm, and 0.3 mm. As a general reference, 0.12 mm and 0.15 mm can be used for many 1P series connection structures, while 0.15 mm and 0.2 mm are commonly considered for 2P or higher parallel connection tabs. A 0.3 mm nickel strip can be considered for high-power battery pack designs when supported by the complete electrical and welding design.
For punched battery tabs, the approximate reference hole size is 11.5–12 × 12 mm for 18650 models and 13.5–14.5 × 14.5 mm for 21700 models. These dimensions should be customized when the battery holder, cell arrangement, welding position, or mechanical structure requires different geometry.
Nickel battery strips can be supplied as continuous coils, cut strips, pre-punched tabs, stamped connectors, and custom battery interconnects. Their flexibility in material selection, dimensions, punching, and stamping makes them suitable for many battery assembly requirements.
For reliable battery pack production, the nickel strip should always be selected as part of the complete battery connection system. Material, thickness, width, current, welding parameters, hole dimensions, cell arrangement, insulation, mechanical structure, and thermal performance should be evaluated together.
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