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Cylindrical Cell Cases with Safety Caps — 18650 / 21700 / 26650 / 32650 / 4680

Cylindrical Cell Cases with Safety Caps — 18650 / 21700 / 26650 / 32650 / 4680

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Empty cylindrical cell cases for laboratory and pilot-scale battery assembly. Available in 18650, 21700, 26650, 32650 and 4680 formats, with matching safety caps and format-specific sealing or insulating components. Designed for cylindrical cell fabrication workflows including grooving and final crimping.

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Cylindrical Cell Components · Empty Cell Cases

Cylindrical cell cases for laboratory battery assembly

Empty cylindrical cell cases supplied with matching pressure-relief safety caps for laboratory and pilot-scale battery assembly. Available in 18650, 21700, 26650, 32650 and 4680 formats, in nickel-plated A3 steel with format-specific sealing or insulating components.

5
Cell formats
18 → 46 mm
Case outer diameter
67 → 86 mm
Empty case height
Included
Pressure-relief cap
Key features

One range for the main cylindrical cell formats

A compact range covering five cylindrical cell formats for laboratory and pilot-scale cell fabrication.

Nickel-plated A3 steel

Case and cap constructed from nickel-plated A3 steel.

Pressure-relief safety cap

Matching safety cap with a pressure-relief function; rated opening pressure is format-specific.

Five cell formats

Available in 18650, 21700, 26650, 32650 and 4680 formats.

Groove & crimp workflow

Intended for cylindrical-cell assembly closed by grooving and crimping.

Available formats

Five cylindrical cell case sizes

Select the required cylindrical cell format directly from the product options.

18650
100 pcs / pack
21700
100 pcs / pack
26650
100 pcs / pack
32650
60 pcs / pack
4680
25 pcs / pack
Dimensional reference

Cylindrical cell case geometry

The drawing below defines the dimensional references used in the format specification table.

Cylindrical Cell Case — Dimensional Reference Generic dimensional reference showing outer diameter, inner diameter, empty case height and a wall-thickness reference. Cylindrical Cell Case — Dimensional Reference Dimensions vary by cell format. Refer to the specification table below. Longitudinal Section H t Top View ØD Ød

ØD = case outer diameter · Ød = case inner diameter · H = empty case height · t = derived wall-thickness reference

Product data

Format specifications

Nominal dimensional data and packaging for each available cylindrical cell case format.

Format ØD — Case OD Ød — Case ID H — Empty Case Height t* — Derived Top Cap (Ø × H) Pack
18650 18.0 mm 17.5 mm 67.0 mm ≈0.25 mm Ø17.5 × 4.05 mm 100 pcs
21700 21.2 mm 20.7 mm 73.1 mm ≈0.25 mm Ø20.4 × 4.2 mm 100 pcs
26650 26.0 mm 25.5 mm 68.0 mm ≈0.25 mm Ø25.5 × 5.0 mm 100 pcs
32650 32.0 mm 31.5 mm 68.0 mm ≈0.25 mm Ø31.5 × 5.3 mm 60 pcs
4680 46.0 mm 45.2 mm 86.0 mm ≈0.40 mm Ø45.2 × 5.5 mm 25 pcs

H indicates the height of the empty cylindrical case as supplied, before the subsequent cell grooving and crimping operations. * t is an indicative value derived from the listed outer and inner diameters: t ≈ (∅D − ∅d) / 2. Because published diameters may be rounded, this calculated value should not be treated as a guaranteed manufacturing wall thickness.

Material & safety

Materials, sealing and safety cap

Case, cap and auxiliary sealing or insulating components are supplied according to the selected cylindrical cell format.

Case & cap construction
Case and cap constructed from nickel-plated A3 steel for cylindrical cell assembly.
Sealing & insulation
Nylon sealing or insulating components are used according to the selected cell format; exact configuration varies by format.
Pressure-relief safety cap
The cap incorporates a pressure-relief safety function. Rated opening pressure varies by cell format.
Applications

Cylindrical cell fabrication

Empty cylindrical cases for laboratory and pilot-scale battery-cell assembly.

Cell assembly
Empty cases and matching cap components for cylindrical-cell fabrication.
Grooving
Suitable for cylindrical-cell assembly workflows incorporating case grooving before final closure.
Final crimping
Intended for final mechanical closure using an appropriate cylindrical-cell crimping process.
Important information

Format-specific configuration

Empty cell components These products are supplied as empty cylindrical cell components, without cathode, anode or electrolyte. They are intended for laboratory cell assembly, do not constitute finished batteries, and must not be used or charged as such.
Empty-case dimensions The dimensions listed in the specification table refer to the empty cylindrical cases as supplied. The H value therefore represents empty-case height rather than the nominal height designation of the finished cylindrical cell format.
Dimensional reference The technical drawing is generic and defines only ØD, Ød, H and t. Numerical values are specified separately for each available cell format.
Safety-cap configuration Safety-cap opening pressure and the sealing or insulating component configuration vary by cell format. Use the specification associated with the selected variant whenever format-specific values are required.
Packaging Package quantity depends on the selected format: 100 pcs for 18650, 21700 and 26650; 60 pcs for 32650; and 25 pcs for 4680.

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