Short answer: A coin cell crimper is a press with a matched die that folds the edge of the coin cell case over the gasket, sealing the cell airtight. Choose one with dies that match your cell size (CR2016, CR2025 or CR2032), a pressure you can set and repeat, and a size that fits inside your glovebox.
What does a coin cell crimper do?
After you stack the electrode, separator, lithium, spacer and spring inside the coin cell case, the crimper presses the cap into the can and deforms the rim around a polymer gasket. A good seal keeps electrolyte in and moisture out for the whole test.
Types of coin cell crimpers
| Type | How it works | Best for |
|---|---|---|
| Manual (lever or screw) | Pressure set by hand | Occasional use, teaching labs |
| Hydraulic | Hand pump with pressure gauge | Most research labs; repeatable pressure |
| Electric / pneumatic | Motor or air driven, preset pressure | High throughput and best consistency |
How to choose
- Die size: each die fits one diameter; 20 mm dies cover CR2016, CR2025 and CR2032.
- Pressure control: a gauge or preset lets every cell be sealed the same way.
- Glovebox fit: check the footprint and weight against your glovebox port.
- Disassembly die: useful for opening cells for post-mortem analysis.
Tips for a good seal
- Centre the cell in the die before pressing.
- Wipe electrolyte off the rim and gasket; wet gaskets seal poorly.
- Use the same pressure every time and record it.
- Check that the finished cell has no visible gap and the right height (3.2 mm for CR2032).
Frequently asked questions
Why are my coin cells leaking?
Usual causes are too much electrolyte, a damaged or missing gasket, a mismatched die, or inconsistent pressure.
Can one crimper do CR2016 and CR2032?
Yes, if it has a 20 mm die; the cell height changes, not the diameter.
Do you supply coin cell crimpers?
We supply coin cell cases, spacers, springs and lithium chips, and can help with crimping equipment. Contact us to ask about availability.
