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ATOMFAIR® polished metallic 21700 cylindrical battery case kits grouped together on a white background.

21700 Cylindrical Battery Case Kit Research Grade ATOMFAIR®

$152.00

Institutional Procurement & Supply Compliance: As a verified US supplier, Atomfair accepts formal institutional Purchase Orders (POs), contract billing schedules, and custom procurement loops for university and national laboratories, and corporate R&D departments globally.

Research grade 21700 battery case kit with Japanese nickel-plated steel (0.22mm wall), pre-welded Al tabs (20×4×0.15mm), IR ≤0.5 mΩ, burst disc. In stock.

SKU: AFMSOFUZ910
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Description

ATOMFAIR® 21700 CYLINDRICAL BATTERY CASE KITS (100 SETS/PACK)

RESEARCH GRADE MATERIAL

Product Overview
Our premium battery case kits establish a high-performance baseline for next-generation 21700 cylindrical battery case integration. Engineered specifically for academic professors, Ph.D. researchers, and corporate engineers conducting high-capacity cell prototyping, this specialized system features ultra-low resistance power caps. Utilizing premium Japanese nickel-plated steel cases, the hardware provides superior mechanical containment alongside robust anti-corrosion behavior. Pre-welded metal tabs and integrated multi-tier protection discs bypass laboratory processing bottlenecks, successfully ensuring uncompromised safety and stable data repeatability during advanced high-power battery R&D workflows.

Technical Specifications
PARAMETER DETAILS
Steel Case Geometry Outer Diameter: 21.15 ± 0.05 mm | Inner Diameter: 20.71 ± 0.05 mm | Total Height: 71.1 ± 0.1 mm | Wall Thickness: 0.22 ± 0.02 mm | Bottom Thickness: 0.25 ± 0.02 mm | Bottom Radius: R0.9 ± 0
Case & Cap Substrate Steel Case: Japanese Imported Nickel-Plated Steel | Top Steel Cap: φ18.95 × 2.0 × 0.5 mm Nickel-Plated Carbon Steel
Cell Compatibility Standard 21700 cylindrical bare cells (Flat-top configuration without built-in PCB protection boards)
Internal Components Safety Burst Disc (φ19.60 × 1.32 × 0.3 mm Aluminum) | Small Insulating Ring (φ14.4 × 0.93 mm PBT) | Internal Connection Plate (φ14.35 × 1.2 × 0.5 mm Aluminum) | Sealing O-Ring (φ20.60 × 4.55 × 0.49 mm PBT)
Internal Resistance ≤0.5 mΩ (Power-type ultra-low resistance structure optimized for large currents)
Pressure Relief Metrics Current Disconnect Pressure: 0.8 – 1.3 MPa | Bursting Pressure Vent: 1.8 – 2.4 MPa
Pre-welded Metal Tabs 20 × 4 × 0.15 mm Pure Aluminum Tabs (Pre-welded via automated production line)
Quality & Corrosion Control Salt spray test: 5 hours (Grade 10); Uniform double-sided O-ring coating process; Smooth surface finish free of foreign matter or burrs
Alternative Options Explore our related catalog or custom cylindrical structures. For tailored bulk configurations or special material testing specs, please contact our support team.

Key Features & Advantages
  • Technical Advantage: Premium imported Japanese nickel-plated steel offers high mechanical strength and exceptional resistance against chemical corrosion during long-term cycling sweeps.
  • Technical Advantage: Power-type internal cell layout lowers cap contact impedance to ≤0.5 mΩ, actively suppressing heat generation under high-current discharge testing.
  • Technical Advantage: High-precision internal aluminum safety burst disc vents reliably if internal gas pressure exceeds safety boundaries, successfully mitigating runaway hazards.
  • Technical Advantage: Factory pre-welded 20 × 4 × 0.15 mm aluminum contact tabs bypass manual processing steps, minimizing cleanroom and glovebox assembly times.
  • Technical Advantage: All-in-one consolidated kit coordinates casings, caps, and pre-formed isolation spacers in equal amounts to ensure seamless integration.

APPLICATION SCOPE: High-capacity anode/cathode material evaluation, power-type liquid electrolyte formulation studies, high-current galvanostatic cycling, 21700 cell prototyping, and custom portable power pack assembly validation runs.
PACKAGING: Dispatched as 100 complete hardware sets per pack, containing 100x steel casings, 100x safety caps, 100x top insulating gaskets, and 100x bottom gaskets, systematically grouped within blister storage trays.
IMPORTANT NOTICE: Regulate storage environment parameters between 0-35 °C and ≤75% RH away from localized heat gradients or volatile gases. These components exhibit a 1-year shelf life under sealed conditions; immediate deployment following vacuum opening is recommended to maintain optimal finish parameters.
TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official quotations.
EMAIL: inquiry@atomfair.com
Manufacturer: Atomfair LLC
Brand: ATOMFAIR®

This battery case kit imposes specific pressure relief and corrosion control requirements to ensure safe operation under high-power conditions. The assembly system is only compatible with flat-top 21700 cells and demands precise dimensional tolerances for proper sealing and electrical performance.

  • Pressure Relief Constraints: The integrated safety burst disc activates at a current disconnect pressure of 0.8 to 1.3 MPa and a bursting pressure of 1.8 to 2.4 MPa to prevent catastrophic failure.
  • Corrosion Resistance Requirement: The nickel-plated steel case must maintain Grade 10 corrosion resistance after 5 hours of salt spray testing to ensure long-term reliability.
  • Cell Compatibility Constraint: Only standard 21700 flat-top bare cells without built-in PCB protection boards are compatible with this assembly system.
  • Internal Resistance Requirement: The power-type top cap achieves ultra-low internal resistance ≤0.5 mΩ, optimized for high-current applications.
  • Dimensional Tolerance Requirement: The case geometry requires strict dimensional tolerances of ±0.05 mm on outer diameter and ±0.1 mm on height for reliable sealing and electrical contact.

How does the ultra-low internal resistance of ≤0.5 mΩ in the ATOMFAIR 21700 case affect the pressure vent activation thresholds for high-power cycling?

The ≤0.5 mΩ internal resistance minimizes heat generation during high current, but the safety vent system is independently calibrated: current disconnect at 0.8-1.3 MPa and burst vent at 1.8-2.4 MPa. This ensures that even with low impedance, thermal runaway is prevented by precise pressure relief mechanisms that activate before the aluminum burst disc ruptures along its predetermined trace.

Can the ATOMFAIR 21700 battery case kit be used with cells that have integrated protection circuits, or only with flat-top bare cells?

These kits are specifically designed for standard 21700 cylindrical bare cells in flat-top configuration without built-in PCB protection boards. The pre-welded aluminum tabs (20×4×0.15mm) and internal component geometry – including the Φ14.35×1.2×0.5mm internal connection plate and Φ20.60×4.55×0.49mm sealing O-ring – assume a bare cell format; using protected cells would physically interfere with these components and compromise sealing and electrical contact.

What are the critical storage and handling requirements to maintain the integrity of the safety burst disc and sealing O-ring in the ATOMFAIR 21700 case kits?

Store sealed kits between 0-35°C at ≤75% RH, away from open flames, heat sources, or corrosive gases to preserve the PBT O-ring and aluminum burst disc integrity. The shelf life is 1 year under sealed conditions, and immediate usage after opening is recommended to prevent contamination or moisture ingress that could compromise the uniform double-sided O-ring coating and smooth surface finish free of foreign matter or burrs.

The ATOMFAIR 21700 battery case kit delivers ultra-low internal resistance (≤0.5 mΩ) and pre-welded aluminum tabs for high-power prototyping, while the Japanese nickel-plated steel housing and integrated burst disc ensure structural integrity and thermal runaway prevention. However, the kit requires strict environmental storage (0–35°C, ≤75% RH) and is exclusively compatible with flat-top 21700 cells lacking protection circuitry.

Positive

  • Power-type ultra-low resistance: Internal resistance ≤0.5 mΩ minimizes heat generation during high-current discharge, enabling reliable high-power testing profiles without thermal distortion.
  • Pre-welded aluminum tabs for rapid assembly: 20×4×0.15 mm tabs are factory-attached via automated welding, eliminating manual tab alignment and spot-welding steps, reducing glovebox processing time.

Trade-offs

  • Controlled storage environment required: Cases must be stored at 0–35°C and ≤75% RH, away from open flames, heat sources, and corrosive gases; sealed shelf life is limited to 1 year.
  • Flat-top cell compatibility only: Designed exclusively for standard 21700 bare cells without built-in PCB protection boards; button-top or protected cells will not fit the assembly.

Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.

To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.

Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).

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