What's Tab Lead
The tab lead is the terminal that takes out electricity from the battery and is an important component that affects battery life and performance.
Generally, aluminum (AL) is used as the lead material for the positive electrode, and nickel-coated copper (Ni-Plating/Cu) is used as the lead material for the negative electrode.
These lead materials are laminated with a polypropylene (PP) seal, which is called a tab lead.
Battery Structure & the Role of Tab Leads
A battery contains an conductive liquid called electrolyte.
If the electrolyte leaks, the performance of the battery will be impaired, and the highly corrosive and flammable nature of the electrolyte can be dangerous, so PP seals are used to seal the liquid by adhering strongly to the outer film.
On the other hand, the leads must be corrosion resistant to prevent corrosion by the electrolyte to extend battery life, and must have good weldability to the current collector foil inside the battery to efficiently extract electricity.
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