Battery cover plate component, battery cell, battery module, power battery pack and electric vehicle

Abstract

The invention provides a battery cover plate component, a battery cell using the battery cover plate component, a battery module including the battery cell, a power battery pack including the batterymodule and an electric vehicle including the power battery pack. The battery cover plate component comprises a cover plate, sealing cavities, an electrode inner terminal for connecting internal current of the battery, and an electrode outer terminal for extracting the current. The first sealing cavity is filled with nitrogen or inert gas. The pressure in the first sealing cavity is greater than the pressure in the second sealing cavity under the normal state so that the conductive deformation part and the electrode inner terminal are enabled to be electrically connected. A reversible medium capable of generating gas is included in the second sealing cavity. When the battery is abnormal, the gas generated by the medium can act on the conductive deformation part to electrically disconnect the conductive deformation part from the electrode inner terminal so as to improve the safety of the battery and enable the battery to be reused.

Description

technical field [0001] The present invention 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 module, a power battery pack including the battery module, and a power battery pack including the battery cover assembly. Electric vehicles with power battery packs. Background technique [0002] Lithium-ion batteries can not only be used as the power source of various portable devices, but also can be used as one of the core components of hybrid electric vehicles and pure electric vehicles. Its safety performance is increasingly valued by automobile manufacturers and battery manufacturers. [0003] One of the existing effective means to solve the battery safety performance is to install a CID (Current Interrupt Device, current interrupt device) on the battery cover. , the reaction between the internal electrolyte and the electrode material will cause a large amou...

AI Technical Summary

Problems solved by technology

However, its shortcomings mainly include: 1. At the initial stage of battery overcharging, the gas generated inside the battery is less, and the breaking structure cannot be disconnected in time; 2. When the internal pressure of the battery is high, the battery has already experienced thermal runaway. , even if the break-off structure is disconnected, it will not protect the battery; 3. When the battery break-off pressure is high, the starting pressure increases, and the break-off structure cannot be disconnected in time; and when the break-off pressure is small, the break-off structure It may be disconnected when the battery is filled with liquid or stored at high temperature

4. Once the safety device is activated, the entire battery will be scrapped and cannot be used again

Therefore, the purpose of this design is to prevent potential safety hazards such as explosions in extreme cases, and it cannot prevent the occurrence of failure earlier, nor can it allow the battery to function again in the case of false start, so that its application in power batteries will be affected. limit

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