US 12,334,570 B2
Top cover assembly of secondary battery and secondary battery
Chengdu Liang, Ningde (CN); Kai Wu, Ningde (CN); Xinxiang Chen, Ningde (CN); Shoujun Huang, Ningde (CN); Baisong Chen, Ningde (CN); Huasheng Su, Ningde (CN); and Guowei Li, Ningde (CN)
Assigned to Contemporary Amperex Technology (Hong Kong) Limited, Hong Kong (CN)
Appl. No. 15/733,847
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
PCT Filed Mar. 24, 2020, PCT No. PCT/CN2020/080879
§ 371(c)(1), (2) Date Nov. 30, 2020,
PCT Pub. No. WO2020/207238, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 201910281152.6 (CN), filed on Apr. 9, 2019.
Prior Publication US 2021/0234219 A1, Jul. 29, 2021
Int. Cl. H01M 50/15 (2021.01); H01M 10/0525 (2010.01); H01M 50/176 (2021.01); H01M 50/188 (2021.01); H01M 50/547 (2021.01); H01M 50/593 (2021.01)
CPC H01M 50/15 (2021.01) [H01M 10/0525 (2013.01); H01M 50/176 (2021.01); H01M 50/188 (2021.01); H01M 50/547 (2021.01); H01M 50/593 (2021.01); H01M 2220/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A top cover assembly of a secondary battery, comprising:
a top cover plate, provided with a through hole;
an electrode terminal, covering the through hole;
an insulating plate, wherein at least part of the insulating plate is arranged on a side of the top cover plate away from the electrode terminal;
a seal, wherein at least part of the seal is arranged between the top cover plate and the electrode terminal; and
an insulator, wherein at least part of the insulator is arranged between the top cover plate and the insulating plate;
wherein the insulator and the seal at least jointly enclose a side wall of the through hole and an area, close to the through hole, on an upper surface of the top cover plate, the seal and the insulator are staggered with each other, and an overlapping part is formed between connecting end parts of the seal and the insulator,
wherein the seal is of an annular structure and comprises:
a first part, arranged between the top cover plate and the electrode terminal; and
a second part, wherein an outline dimension of the second part relative to a center of the through hole on a cross section is smaller than that of the first part, and
wherein the insulator is of an annular structure and comprises:
a third part, arranged between the top cover plate and the insulating plate; and
a fourth part, wherein an outline dimension of the fourth part relative to a center of the through hole on a cross section is smaller than that of the third part, an outer surface of the fourth part is fit with the side wall of the through hole, and a top surface of the fourth part is not lower than an upper surface, in contact with the seal, of the top cover plate, and the top surface of the fourth part is higher than a bottommost surface of the seal,
wherein the second part is arranged on a side of the fourth part closest to the center of the through hole and is in contact with the insulator, and
wherein the insulating plate comprises a first main body part and an annular extending part which are connected with each other, the extending part extends to the through hole and at least part of the extending part is arranged in the through hole, and a bottom end of the second part abuts against a top end of the extending part.