Top cover of power battery, assembly method thereof and power battery

Abstract

The invention discloses a top cover of a power battery. The top cover of the power battery comprises a top cover sheet, a first terminal post, a second terminal post, a first mounting hole, a second mounting hole, an explosion-proof valve and a liquid filling hole, wherein the first terminal post, the second terminal post, the first mounting hole, the second mounting hole, the explosion-proof valve and the liquid filling hole are arranged on the top cover sheet; the first terminal post is mounted in the first mounting hole; the second terminal post is mounted in the second mounting hole; the first terminal post comprises a first matrix part and a second matrix part; a first column part is arranged between the first matrix part and the second matrix part; a first groove is formed among thefirst matrix part, the first column part and the second matrix part; a first seal ring sleeves the first column part; conductive plastic parts are arranged among the first matrix part, the first column part, the first seal ring and the top cover sheet; and a first insulating part is arranged among the second matrix part, the first seal ring and the top cover sheet. An H-shaped terminal post structure of the top cover of the power battery can achieve a good axial positioning effect on top cover parts, so the top cover of the power battery is compact and reliable in structure, dispenses with a riveting working procedure required by a T-shaped terminal post with a conductive block, reduces production cost and improves assembly efficiency.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a power battery top cover, an assembly method thereof, and a power battery. Background technique [0002] As an important part of the power battery, the top cover generally includes a top cover sheet, an explosion-proof valve, a liquid injection hole, a positive pole and a negative pole, etc. Among them, the pole is the internal and external conduction part of the power battery, one end of which is connected to the external circuit of the power battery, and the other end is connected to the battery cell inside the power battery to realize the charging and discharging function of the battery; when the battery is assembled, the positive pole needs to be Pass through the top cover and connect with the positive pole lug of the battery; the negative pole must pass through the top cover and connect with the negative pole of the battery; the assembly function require...

AI Technical Summary

Problems solved by technology

Among them, threaded assembly is to process threads on the pole, and then use nuts to fix the pole and the top cover sheet. Since this method requires threading of the pole and nuts, the processing is complicated, the cost is high, and the assembly efficiency is low. product is heavy

The circlip assembly is to process a ring-shaped slot on the pole. By installing the circlip on the slot of the pole, it presses the top cover and other parts so that they cannot move axially, so that the pole and the pole are connected. The assembly between the top cover pieces; although this method has high reliability and can reduce the product weight compared with threaded assembly, this method also has the problems of cumbersome processing and low assembly efficiency, and there are also problems due to the circlip assembly The risk of pole loosening and battery short circuit caused by improper positioning

Riveting assembly is to put a T-shaped pole on the top cover and then rivet it with the conductive block. However, the reliability of the riveting method is relatively low, and the stability of the connection between the pole and the conductive block cannot be guaranteed; and the riveted The method makes the contact area between the pole and the conductive block too small, resulting in poor flow capacity between the two

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