Power battery top cover and power battery using top cover

Abstract

The invention belongs to the technical field of power batteries, and especially relates to a power battery top cover and a power battery using the top cover. The power battery top cover comprises a top cover sheet, and a firs pole pillar, a second pole pillar, a pressure release valve, a liquid injection hole, pneumatic overturning sheets and a resistor block, the first pole pillar is in insulation connection with the top cover sheet, the second pole pillar is electrically connected with the top cover sheet through the resistor block, the pneumatic overturning sheets are electrically connected with the top cover sheet, the conductive block is arranged above the pneumatic overturning sheets, a baffle plate is arranged under the pressure release valve, the pneumatic overturning sheets comprise a first pneumatic overturning sheet and a second pneumatic overturning sheet, and the thickness of the first pneumatic overturning sheet is smaller than the thickness of the second pneumatic overturning sheet; and when the pressure in the power battery increases, the pneumatic overturning sheet and the second pneumatic overturning sheet sequentially move upward in order to electrically connect the first pole pillar with the second pole pillar. Compared with power battery top covers in the prior art, the power battery top cover disclosed in the invention makes the power battery have an excellent safety protection function in overcharging, nailing, short circuit and hot box test.

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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