CPC H01M 50/534 (2021.01) [H01M 10/04 (2013.01); C25D 1/04 (2013.01); C25D 3/38 (2013.01); H01M 4/661 (2013.01); H01M 4/70 (2013.01); H01M 10/0525 (2013.01); H01M 50/533 (2021.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11)] | 11 Claims |
1. A tab, which is a copper foil material, wherein a surface of the copper foil material having a large compressive stress is an S surface, a surface having a small compressive stress is an M surface, and only the M surface is provided with an indentation or a reinforcing rib, and
wherein a thickness of the copper foil material is 4 to 8 μm, and a depth of the indentation or a height of the reinforcing rib is between 60 and 120 μm.
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