Tab and battery including the tab
A tab, a preparation method thereof, and a battery including the tab are disclosed. The tab is a copper foil material, 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. In the preparation method of the tab of the disclosure, the S surface/M surface of the copper foil material are identified, and it is ensured that a feed direction is oriented so that the M surface faces outward (or inward), and winding/unwinding directions of each process and a mounting direction of an embossing device are reasonably fixed, so as to ensure that a tab emboss pattern of a product is pressed on the M surface of the copper foil material rather than the S surface or both surfaces.
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.
2. The tab according to claim 1 , wherein a shape of the indentation or the reinforcing rib is one or more of a stripe and a dot.
3. The tab according to claim 2 , wherein the stripe extends in a tab lead-out direction.
4. The tab according to claim 3 , wherein the copper foil material is an electrolytic copper foil material, the S surface is a shiny surface, and the M surface is a matte surface.
5. The tab according to claim 2 , wherein the copper foil material is an electrolytic copper foil material, the S surface is a shiny surface, and the M surface is a matte surface.
6. The tab according to claim 1 , wherein the copper foil material is an electrolytic copper foil material, the S surface is a shiny surface, and the M surface is a matte surface.
7. A battery comprising the tab according to claim 1 .
8. A preparation method of a tab, comprising:
detecting surfaces of a copper foil material to identify an S surface and an M surface of the copper foil material, wherein the S surface is a surface having a large compressive stress, and the M surface is a surface having a small compressive stress, wherein a thickness of the copper foil material is 4 to 8 μm;
controlling a feed direction of the copper foil material and winding and unwinding directions of coating, rolling, slitting, and die cutting so that the M surface faces outward or inward; and
forming an indentation or a reinforcing rib on the M surface, wherein a depth of the indentation or a height of the reinforcing rib is between 60 and 120 μm.
9. The preparation method of a tab according to claim 8 , wherein a shape of the indentation or the reinforcing rib is one or more of a stripe and a dot.
10. The preparation method of a tab according to claim 9 , wherein the stripe extends in a tab lead-out direction.
11. The preparation method of a tab according to claim 8 , wherein the copper foil material is an electrolytic copper foil material, the S surface is a shiny surface, and the M surface is a matte surface.