Top cover assembly of secondary battery and secondary battery

Abstract

The invention provides a top cover assembly of a secondary battery and the secondary battery. The top cover assembly of the secondary battery comprises a top cover plate, a first electrode terminal, aconnection piece and a sealing piece, wherein the material of the top cover plate is insulation plastic, an electrode leading-out hole is formed in the top cover plate, the first electrode terminal comprises a terminal plate, the terminal plate is arranged at one side of the top cover plate and covers the electrode leading-out hole, a peripheral surface of the terminal plate protrudes out of an inner wall surface of the electrode leading-out hole, the connection piece is connected with the top cover plate and the first electrode terminal, the first electrode terminal is fixedly arranged at the top cover plate by the connection piece, and the sealing piece encircles the electrode leading-out hole and is arranged between the top cover plate and the terminal plate so as to seal the electrodeleading-out hole. By the top cover assembly, the sealing effect of a secondary battery shell is ensured, the occupancy of the internal space of the battery shell is reduced, thus, the energy densityof the secondary battery can be improved, and the application reliability of the secondary battery is ensured.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to a top cover assembly of a secondary battery and the secondary battery. Background technique [0002] At present, the power battery generally adopts a square hard shell structure. The power battery shell includes a shell and a top cover assembly. The power battery shell provides a closed space to accommodate the electrode assembly and electrolyte. The electric energy of the electrode assembly passes through the pole of the top cover assembly. Lead out from the confined space to the outside of the confined space. In the existing top cover assembly, the top cover plate is a metal plate and has a through hole, and the pole is divided into a base part and an extension part, and the cross-sectional area of ​​the base part is larger than the diameter of the through hole. When assembling, the base part is located under the top cover plate (that is, inside the housing), an...

AI Technical Summary

Problems solved by technology

[0003] Since a part of the pole is located inside the shell (usually 1.5-4 mm), and the sealing ring is also located inside the shell, the space utilization rate inside the battery shell will be low, resulting in low energy density of the battery, and because each pole Both columns need to be machined, making the manufacturing process complicated and expensive to manufacture

Moreover, in order to insulate the top cover plate from the electrode terminals provided thereon, it is usually necessary to arrange corresponding insulating parts between the pole and the top cover plate, thus increasing the structural complexity of the top cover assembly and increasing the The overall height of the top cover assembly results in low battery energy density

Images