Battery cover components, single cells, battery modules, power battery packs and electric vehicles

Abstract

The disclosure relates to a battery cover assembly, a single battery, a battery module, a power battery pack, and an electric vehicle. The battery cover assembly includes a cover, an electrode inner terminal and an electrode outer terminal. The electrode inner terminal and the electrode outer terminal pass through The current interruption structure is electrically connected, and the battery cover plate assembly includes a sealed cavity for filling with a gas-generating medium and installed on the outside of the cover plate. When the voltage difference between the negative electrodes exceeds the rated value, the gas-generating medium can generate gas to break through the sealed cavity under the action of the gas pressure so that the gas enters the interior of the battery and circulates to the current interruption structure to The electrical connection between the inner terminal of the electrode and the outer terminal of the electrode is broken by the action of air pressure. The cover plate assembly has a gas generation mechanism independent of the inside of the battery. The gas is generated in time to build up the air pressure for the current interruption structure, and the current interruption structure is pulled off in time to improve the safety of the battery.

Description

technical field [0001] The present disclosure relates to the field of batteries, in particular, to a battery cover assembly, a single battery using the battery cover assembly, a battery module including the battery, a power battery pack including the battery module, and a power battery pack including the battery Electric vehicles with power battery packs. Background technique [0002] The existing CID (Current Interrupt Device, current interruption device) technical solution is usually equipped with a pull-off structure that senses the air pressure in the battery. In extreme cases such as thermal runaway of the battery, the reaction between the internal electrolyte and the electrode material will make the A large amount of gas is generated inside the battery. When the gas inside the battery increases, the internal pressure increases, and the increased pressure makes the flipping piece in the breaking structure turn outward, thereby breaking the broken piece with local thinni...

AI Technical Summary

Problems solved by technology

[0004] 1. In the initial stage of battery overcharging, the gas generated inside the battery is less, and the breaking structure cannot be disconnected in time

[0005] 2. When the internal pressure of the battery is high, the battery has already experienced thermal runaway, even if the structure is disconnected, it will not be able to protect the battery

[0006] 3. When the battery breaking pressure is high, the starting pressure increases, and the breaking structure cannot be disconnected in time; while when the breaking pressure is small, the breaking structure may break when the battery is filled with liquid or stored at high temperature

When the internal pressure of the battery is too high, the battery is often in a state of thermal runaway. Although the circuit can be broken at this time, it cannot stop the interaction between the internal materials of the battery and still cannot protect the battery.

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