Battery Cell Components & Assembly Kits

Coin Cell Parts Selection Matrix

Product Family	Primary Function	Common Options	Key Parameters	Typical Use
Coin Cell Cases	Provide enclosure, mechanical support, and current conduction	Positive cases, negative cases, covers, bottoms, case sets	Cell format, diameter, internal height, material, sealing method	Standard coin cell assembly
Sealing Rings	Help prevent leakage and isolate positive and negative components	Polymer seals, replacement rings, format-specific seals	Outer diameter, inner diameter, thickness, material, electrolyte compatibility	Cell sealing and insulation
Insulating Washers	Prevent direct contact between conductive components	Insulating rings, washers, and isolation components	Dimensions, thickness, chemical resistance, temperature resistance	Short-circuit prevention and structural isolation
Conductive Spacers	Adjust stack height and improve electrical contact	Stainless steel, aluminum, nickel, and coated spacers	Diameter, thickness, material, surface treatment	Internal height and contact stability control
Wave Springs	Provide continuous axial pressure	Stainless steel and coated wave springs	Outer diameter, free height, material, spring force	Standard coin cell assembly
Conical Springs	Provide support, positioning, and elastic pressure	Stainless steel, aluminum-clad, and gold-coated springs	Outer diameter, height, wire size, compression range	Thicker electrodes or higher pressure requirements
Coated Components	Improve contact behavior, corrosion resistance, or chemical stability	Gold-coated, nickel-coated, and aluminum-clad components	Substrate, coating location, coating thickness, compatibility	High-voltage, EIS, and corrosive electrolyte testing
Mesh or Perforated Cases	Provide controlled gas access	Mesh cases, perforated cases, gas-access cases	Opening design, gas access, sealing method	Lithium-air, lithium-oxygen, and gas-involved testing
Complete Assembly Kits	Provide matched components for assembly	Case sets, case-spacer-spring kits, specialty kits	Format, included parts, materials, quantity	Fast assembly and repeatable laboratory testing

Coin Cell Cases

Coin cell cases are the foundation of laboratory coin cell assembly. They generally consist of a positive case, negative case, cover, bottom, and compatible sealing structure. The case provides space for the electrode, separator, and electrolyte while also supporting mechanical compression and electrical conduction.

Common case formats include:

• CR2016;
• CR2025;
• CR2032;
• Other CR-series coin cell formats;
• Small button cell formats;
• Custom formats for specialized assembly structures.

Common materials include:

• 304 stainless steel;
• 316 or 316L stainless steel;
• Aluminum or aluminum-clad structures;
• Nickel-coated structures;
• Gold-coated structures;
• Other surface-treated materials for application-specific requirements.

Compatibility should not be determined by appearance alone. Even when two formats have similar diameters, their internal height, case thickness, sealing structure, and crimping requirements may differ. Confirm that the case format matches the target electrode and assembly method.

Sealing Rings and Insulating Washers

Sealing rings and insulating washers isolate positive and negative components, reduce the risk of internal short circuits, and help maintain the sealed condition of the assembled cell.

Common products include:

• Coin cell sealing rings;
• Insulating washers;
• Internal insulating rings;
• Polymer sealing components;
• Chemically resistant seals;
• Replacement seals matched to specific CR formats.

When selecting a sealing ring, confirm the case diameter, internal height, and cell format. Electrolyte compatibility, compression behavior, and long-term sealing stability should also be considered. Replace seals that show cracks, deep impressions, deformation, hardening, or contamination.

Conductive Spacers

Conductive spacers adjust the internal stack height, improve contact between the electrode and case, and help maintain stable mechanical pressure and electrical conduction.

Common materials include:

• 304 stainless steel;
• 316 or 316L stainless steel;
• Aluminum;
• Nickel and nickel-coated materials;
• Gold-coated and other surface-treated materials.

Spacer selection depends on:

• Outer diameter;
• Inner diameter;
• Thickness;
• Coin cell case format;
• Electrode thickness;
• Separator thickness;
• Spring height;
• Electrolyte and testing environment.

A spacer that is too thin may result in insufficient contact, while a spacer that is too thick may create excessive stack height, difficult sealing, or excessive internal pressure. Spacers should therefore be selected together with the case, sealing ring, and spring.

Wave Springs and Conical Springs

Springs provide continuous contact pressure inside the coin cell and help maintain stable contact between the electrode, separator, spacer, and case.

Common spring types include:

• Wave springs;
• Conical springs;
• Multi-wave springs;
• Stainless steel springs;
• Aluminum-clad springs;
• Gold-coated springs;
• Other surface-treated springs.

Confirm the following when selecting a spring:

• Outer diameter;
• Spring height;
• Material;
• Surface coating;
• Combined height with the spacer;
• Compatible coin cell format;
• Effect on the overall sealed stack height.

Wave springs have a compact structure and relatively broad contact area, making them suitable for many standard coin cell assemblies. Conical springs provide positioning and resistance to buckling and may be preferred for assemblies requiring more controlled pressure or greater internal stack height.

Materials and Surface Treatment Matrix

Material or Treatment	Main Characteristics	Applications to Consider
304 Stainless Steel	General-purpose material for routine laboratory use	Standard battery materials and electrochemical testing
316/316L Stainless Steel	Higher corrosion resistance for demanding environments	Corrosive electrolytes and extended testing
Aluminum or Aluminum-Clad	Low weight with application-dependent electrical properties	Specialized electrochemical and high-voltage research
Nickel or Nickel-Coated	Electrical and corrosion-resistant surface option	Special electrolyte systems and contact structures
Gold-Coated	Stable contact and surface chemistry for precision applications	EIS, low-current, and precision electrochemical testing
Specialty Coatings	Surface optimization for specific operating conditions	Application-specific battery research

Material selection should consider the positive and negative electrode materials, electrolyte, operating voltage, temperature, and test duration. A coated component should not be assumed to be compatible with every electrochemical system.

Mesh and Perforated Coin Cell Cases

Mesh and perforated cases are specialty coin cell components for experiments that require controlled gas access or gas diffusion.

Typical application areas include:

• Lithium-air battery research;
• Lithium-oxygen battery research;
• Gas diffusion electrode testing;
• Oxygen reduction studies;
• Gas-liquid-solid interface electrochemistry.

Confirm the following when selecting a specialty case:

• Mesh or perforation location;
• Opening size;
• Gas-access area;
• Case sealing structure;
• Compatibility with sealing rings, spacers, and springs;
• Compatibility with the target electrode and separator;
• Effect on electrolyte retention and cell sealing.

Complete Coin Cell Assembly Kits

Complete assembly kits are suitable for users beginning coin cell assembly or seeking improved consistency between repeated laboratory builds.

Depending on the configuration, a kit may include:

• Positive case;
• Negative case;
• Sealing ring;
• Insulating washer;
• Conductive spacer;
• Wave spring;
• Conical spring;
• Specialty coated components;
• Mesh or perforated case.

Confirmation Item	Information to Verify
Cell Format	CR2016, CR2025, CR2032, or another format
Case Configuration	Whether both positive and negative cases are included
Sealing Components	Whether sealing rings and insulating parts are included
Conductive Components	Whether spacers or other conductive contact parts are included
Spring Components	Whether a wave spring or conical spring is included
Material	304, 316L, aluminum-clad, nickel-coated, or gold-coated
Special Structure	Standard sealed, mesh, or perforated structure
Package Quantity	Single kit, small pack, or bulk pack
Customization	Whether dimensions, thickness, material, and surface treatment can be customized

Stack Height and Component Matching

The internal height of an assembled coin cell is determined by the combined thickness of the main components:

Electrode thickness + separator thickness + spacer thickness + spring height + seal compression space

Before ordering, confirm the following:

• Whether the electrode diameter matches the case inner diameter;
• Whether the spacer creates excessive stack height;
• Whether the compressed spring provides sufficient contact pressure;
• Whether the sealing ring matches the case structure;
• Whether the assembly kit includes all required components;
• Whether the case material is compatible with the electrolyte and operating voltage.

Frequently Asked Questions

Category Scope

This category focuses on coin cell cases, internal coin cell assembly parts, sealing and insulating components, conductive spacers and springs, specialty materials and coated components, mesh or perforated coin cell cases, and matched coin cell assembly kits. Pouch cell test fixtures, research test cells, in-situ or operando battery test cells, and general laboratory consumables belong to other product categories.