A power battery top cover and a power battery using the top cover

Abstract

The invention belongs to the technical field of power batteries, and in particular relates to a power battery top cover and a power battery using the top cover. The power battery top cover includes a top cover sheet and a first pole and a second pole arranged on the top cover sheet. , pressure relief valve, liquid injection hole, air pressure flip sheet and resistance block, the first pole is insulated and connected to the top cover sheet, the second pole is electrically connected to the top cover sheet through the resistance block, and the air pressure flip sheet is electrically connected to the top cover sheet , a conductive block is arranged above the pressure relief valve, and a baffle is arranged below the pressure relief valve. The air pressure reversal sheet includes a first air pressure reversal sheet and a second air pressure reversal sheet. The thickness of the first air pressure reversal sheet is smaller than that of the second air pressure reversal sheet thickness; when the internal pressure of the power battery increases, the first air pressure flipping sheet and the second air pressure flipping sheet move upward successively, so that the first pole and the second pole are electrically connected. Compared with the prior art, the present invention enables the power battery to have excellent safety protection functions under overcharge, nail penetration, short circuit and hot box tests.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a power battery top cover and a power battery using the top cover. Background technique [0002] Electric vehicles and energy storage power stations generally need to use large-capacity power batteries as power sources. In addition to high capacity, these power batteries should also have good safety and long cycle life, so as to meet the standards of use and meet people's needs. [0003] In the prior art, when the power battery is overcharged, the decomposition of the electrolyte in the power battery will cause excessive heat inside the power battery and cause the battery to catch fire; or increase the internal pressure of the power battery and cause the battery to explode. Therefore, before the power battery goes out of control, it is necessary to use an external short-circuit structure to cut off the connecting part (Fuse) between the positive tab and the p...

AI Technical Summary

Problems solved by technology

The reason is that the first short-circuit component and the second short-circuit component in the top cover structure need to move upwards at the same time, so that a large current will be generated instantaneously during the overcharge, nail penetration or Hot-Box test, because the large current will make the fuse Fusing occurs immediately, resulting in the remaining capacity (SOC) of the battery cell not being reduced in time, and the accumulated energy cannot be released, so the battery cell is still in a high temperature state at this time, and the probability of thermal runaway of the battery is greatly increased

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