US 12,244,024 B2
Top cover assembly and secondary battery
Shoujun Huang, Ningde (CN); Yuanbao Chen, Ningde (CN); Huasheng Su, Ningde (CN); and Peng Wang, Ningde (CN)
Assigned to Contemporary Amperex Technology (Hong Kong) Limited, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Dec. 19, 2020, as Appl. No. 17/128,054.
Application 17/128,054 is a continuation of application No. PCT/CN2020/082356, filed on Mar. 31, 2020.
Claims priority of application No. 201920776865.5 (CN), filed on May 27, 2019.
Prior Publication US 2021/0135310 A1, May 6, 2021
Int. Cl. H01M 50/148 (2021.01); H01M 10/0525 (2010.01); H01M 50/172 (2021.01); H01M 50/184 (2021.01); H01M 50/188 (2021.01); H01M 50/552 (2021.01)
CPC H01M 50/148 (2021.01) [H01M 10/0525 (2013.01); H01M 50/172 (2021.01); H01M 50/184 (2021.01); H01M 50/188 (2021.01); H01M 50/552 (2021.01); H01M 2220/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A top cover assembly comprising:
a top cover plate comprising a lead-out hole and an inside surface forming the lead-out hole;
an electrode terminal comprising a cylindrical portion and an annular flange extending in a circumferential direction of the cylindrical portion, wherein the cylindrical portion penetrates through the lead-out hole, and the annular flange extends along a radial direction of the lead-out hole beyond the inside surface;
a sealing ring comprising a barrel portion and a ring portion extending in the circumferential direction of the barrel portion, wherein the barrel portion of the sealing ring surrounds the cylindrical portion, the inside surface is connected with the cylindrical portion through the barrel portion in a sealing manner, the ring portion comprises a first ring body and a second ring body successively distributed along the radial direction, the first ring body is connected with the barrel portion, the annular flange is connected with the top cover plate through the first ring body in a sealing manner, and the second ring body does not extend beyond the annular flange;
an insulating member comprising a connecting portion and an extension portion, wherein along the axial direction of the lead-out hole, a projection of the connecting portion overlaps with a projection of the second ring body, the connecting portion is connected with the second ring body in a sealing manner, a portion of the insulating member beyond the second ring body forms the extension portion, and along the radial direction, the extension portion extends beyond the annular flange,
wherein the top cover assembly further comprises a lower insulating plate, at least part of the lower insulating plate is disposed between the top cover plate and the annular flange of the electrode terminal along the axial direction and a projection of the lower insulating plate and a projection of the extension portion comprise an overlapped area along the axial direction,
wherein the second ring body and the lower insulating plate overlap along the axial direction, and form a sealing interface perpendicular to the axial direction and a sealing interface parallel to the axial direction at the overlap, and
the lower insulating plate is an integrated member,
wherein the sealing ring comprises an annular accommodation groove, the annular accommodation groove and the second ring body are arranged along the axial direction, and the connecting portion is at least partially disposed in the annular accommodation groove.