Power battery top cover based on tab direct-leading type flat welding structure

Abstract

The invention discloses a power battery top cover based on a tab direct-leading type flat welding structure. The power battery top cover comprises a metal hard connection part, a metal protection sheet, an upper cover plate, upper plastic and two electrode columns, wherein the metal protection sheet is connected with the metal hard connection part through a tab of a naked battery cell; the upper cover plate is fixed on the upper plastic; the upper cover plate is matched with the upper plastic; one end of each electrode column is electrically connected with the metal hard connection part and the other end of each electrode column penetrates through the upper plastic and the upper cover plate; the electrode columns are in sealing connection with the upper plastic. The upper plastic is used for replacing a retainer and the occupied space of the retainer is reduced; the inner space utilization rate of a battery is improved and the energy density of the battery is improved by 70 percent atleast; after the retainer is cancelled, the naked battery cell and an electrode of a top cover plate do not need to be connected through a metal conductor, so that the distance of a circuit is shortened, the inner resistance of the battery is reduced and the rate performance is improved; meanwhile, the heat generated by the inner resistance is greatly reduced and the safety performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a power battery top cover based on a lug direct-leading flat welding structure. Background technique [0002] At present, for electric vehicles and energy storage power stations, hard-shell batteries are widely used in the industry, and they all hope to improve the utilization rate of the internal space of the battery. The gap area where the bare cell is connected to the top cover generally adopts the mode of a plastic cage to separate the bare cell from the top cover. For batteries with different capacities, the height of the cage is designed according to the capacity. The height of the cage generally ranges from 8 to 12 mm, which is equivalent to occupying the height space of 8 to 12 mm of the battery cell, which occupies a large proportion and affects the energy density of the battery. [0003] Because the existing power battery tabs are all Y-shaped...

AI Technical Summary

Problems solved by technology

The automation of the power battery production line is an inevitable trend, and the combination of the left and right cages is prone to defective products during automated operations, which reduces the product qualification rate

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