Working Principle of Lithium Battery Cap

The function and principle of the battery cap

(1) Positive or negative terminal

(2) Temperature protection function: PTC (sudden increase in resistance, cut off current)

(3) Power-off protection function: CID current disconnecting device

(Inner pressure rises → Vent flips → CID solder joints break)

(4) Pressure relief protection function: Vent

(Inner pressure rises → Vent flips → CID solder joints break → pressure continues to rise → Vent ruptures)

(5) Sealing function: waterproof, gas intrusion, anti-electrolyte evaporation

Key points of cap design

(1) Reduce the height of the cap

(2) Vent's double-sided notch is optimized to single-sided notch, and Vent's blasting and flipping consistency is better

(3) Using duralumin CID application, the Vent notch is not easy to stretch and deform, and its blasting consistency is better

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