21700 Cylindrical Battery Cases Stainless Steel Casing Sets with Sealing Gaskets and Caps

Product Overview

This high-precision cylindrical cell hardware set provides a reliable structural enclosure designed specifically for the prototyping, pilot production, and electrochemical testing of next-generation 21700 lithium-ion and sodium-ion battery cells. Built from premium-grade materials to exacting dimensional tolerances, the hardware ensures dependable mechanical containment and robust internal electrical isolation across repeated charge-discharge cycles.

Engineered primarily for laboratory researchers, university research groups, and industrial cell manufacturing pilot lines, this casing set integrates seamlessly into standard cell fabrication workflows. It allows engineers to evaluate novel electrode chemistries, cathode/anode active material formulations, solid-state or liquid electrolytes, and advanced separator configurations under standardized, repeatable conditions.

Constructed to withstand demanding electrochemical environments, the assembly offers superior structural integrity, exceptional resistance to electrolyte corrosion, and airtight sealing reliability. Whether deployed in automated pilot crimping machines or manual laboratory presses, this hardware ensures leak-proof operation and consistent physical dimensions, minimizing experimental variance across all testing protocols.

Key Features

• Corrosion-Resistant 304 Stainless Steel Casing: Fabricated from high-purity 304 stainless steel, the cylindrical case body provides outstanding chemical compatibility with aggressive non-aqueous liquid electrolytes, minimizing transition metal dissolution and parasitic side reactions during high-voltage cycling.
• Precision-Machined Dimensional Consistency: Tight inner and outer diameter tolerances (21.06 mm ID x 21.13 mm OD) guarantee uniform internal winding volume and consistent contact pressure between the internal jelly-roll electrode assembly and the outer can wall.
• Nickel-Plated Stainless Steel Top Cap: The top cap assembly utilizes a robust stainless steel substrate enhanced by a uniform nickel coating, providing low electrical contact resistance, high current collection efficiency, and superior resistance to external atmospheric oxidation.
• Airtight Nylon O-Ring Sealing: Equipped with a precision-molded nylon O-ring gasket that deforms uniformly under radial and axial crimping pressure to deliver a hermetic, leak-proof seal that prevents electrolyte dry-out and ambient moisture ingress.
• Polypropylene (PP) Insulating Spacer: High-dielectric PP internal spacer provides critical electrical isolation between the top terminal and the casing body, preventing short circuits under high mechanical compression and elevated operating temperatures.
• Optimized for High-Energy Density Configurations: Standardized form factor accommodates high-capacity cell builds capable of achieving 13.15 Wh to 16.77 Wh nominal capacities while maintaining structural containment during cyclic expansion and contraction.
• Seamless Crimping Tool Compatibility: Fully compatible with standard automated and manual matrix crimping dies, ensuring reproducible crimp heights and reliable bursting pressure thresholds without localized stress fractures or deformation.

Applications

Technical Specifications

Why Choose This Product

• Exceptional Material Quality: Manufactured exclusively from industrial-grade 304 stainless steel and high-purity nickel-plated components, ensuring zero chemical contamination in advanced battery chemistry research.
• Precision Manufacturing Tolerances: Stringent quality control protocols maintain micro-scale dimensional accuracy across every batch, ensuring flawless feed into automatic crimpers and consistent internal jelly-roll compression.
• Complete Ready-to-Assemble Sets: Each unit includes matched cans, nickel-plated caps, pre-installed nylon O-rings, and PP insulating spacers, streamlining laboratory workflow and eliminating component mismatching.
• Proven Hermetic Reliability: Engineered to deliver outstanding burst resistance and hermetic sealing integrity under rigorous thermal cycling and continuous multi-C charge-discharge stress tests.

Contact our technical sales team today to request a quote, order sample batches, or discuss bulk component customization for your battery research facility.

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