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In order to ensure the safe and reliable use of lithium-ion batteries, experts have carried out very strict and meticulous battery safety design to achieve battery safety assessment indicators.

(1) The 135 ℃ automatic shut-off protection of the diaphragm adopts the internationally advanced Celgard2300pE pp-pE three-layer composite membrane. When the battery temperature reaches 120 ℃, the pE film holes on both sides of the composite film close, the internal resistance of the battery increases, and the internal temperature rise of the battery slows down. When the battery temperature reaches 135 ℃, the PP film holes close, the internal circuit of the battery breaks, and the battery no longer heats up, ensuring the safety and reliability of the battery.

(2) When adding additives to the electrolyte, under the condition of overcharging the battery and a voltage higher than 4.2V, the electrolyte additives aggregate with other substances in the electrolyte, resulting in a significant increase in internal resistance of the battery. A large area of open circuit is formed inside the battery, and the battery no longer heats up.

(3) The composite structure of the battery cover adopts a scratch explosion-proof structure. When the battery is heated up, some of the gas generated during the activation process inside the battery expands, causing the internal pressure of the battery to increase, and the pressure reaches a certain degree of scratch rupture and deflation.

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