Power battery top cover assembly, power battery and battery module

Abstract

The embodiment of the invention provides a power battery top cover assembly, a power battery and a battery module, wherein the power battery top cover assembly comprises a top cover sheet and a firstelectrode terminal, and the first electrode terminal comprises a first conductive plate, a first electrode post and a first terminal plate; Wherein the first pole has a first portion and a second portion, the connecting surface between the first portion and the second portion is at a non-zero included angle with the top cover sheet, and the second portion extends upwardly and through the top coversheet; The first conductive plate is connected with the first part; The first terminal block is connected to the second part. A power battery top cover assembly, since the connection surface betweenthe first portion and the second portion is at a non-zero included angle with the top cover sheet, Therefore, the tensile stress exerted by the sealing ring on the lower end of the first pole does notact perpendicularly on the connecting surface between the first portion and the second portion, i.e., the tensile stress acting perpendicularly on the connecting surface is reduced, thereby reducingthe risk of cracking or breaking of the first pole at the connecting surface.

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to a power battery top cover assembly, a power battery and a battery module. Background technique [0002] In the nonaqueous electrolyte secondary battery, aluminum or an aluminum alloy that is insoluble in the nonaqueous electrolyte at the positive electrode potential is suitably used as a constituent material of the positive electrode pole that contacts the electrolytic solution. Copper or a copper alloy that is not alloyed with the negative electrode active material is often used as a constituent material of the negative electrode pole that is in contact with the electrolytic solution. [0003] When the power battery is grouped, the busbar needs to be welded on the positive terminal board or the negative terminal board. Because the busbar is mostly made of a single material (such as aluminum or copper), and the melting point of aluminum is lower than that of copper...

AI Technical Summary

Problems solved by technology

In the prior art, since the connecting surface between the upper part of the pole and the lower part of the pole is parallel to the top cover sheet, the tensile stress exerted by the sealing ring on the lower part of the pole will act perpendicularly to the connecting surface, making the connection The surface is subjected to a large tensile stress for a long time, so the power battery is likely to cause cracks or even disconnection of the connection surface after a period of use, resulting in liquid leakage, which is more likely to occur when the diameter of the pole is small

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