Tesla introduced the world to the 4680 battery cell. At 46 millimeters in diameter and 80 millimeters long, it was supposed to beof batteries — the perfect size for getting the most bang for the buck out of an EV battery pack. Buthas other ideas. It is working on 4680 battery cells for Tesla, which is the biggest game in town, but it is also trialing shorter versions of the “fat cells” it hopes to provide to other manufacturers like Volvo, BMW, and Stellantis.
The extra length can also lead to difficulties in injecting the electrolyte that sits between those components correctly. A longer battery means that electrolytes can leak out when they are injected, which means the area between the can and the cap must be cleaned. Samsung SDI is planning to use etching laser technology for that purpose.
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