US 12,100,867 B2
End cover assembly, secondary battery, battery module, appratus, liquid-injection method and device
Qichang Cai, Ningde (CN); Chengyou Xing, Ningde (CN); Libin Zhong, Ningde (CN); Wenwei Chen, Ningde (CN); Quankun Li, Ningde (CN); and Peng Wang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Aug. 16, 2023, as Appl. No. 18/234,496.
Application 18/234,496 is a continuation of application No. 17/831,673, filed on Jun. 3, 2022, granted, now 11,777,184.
Application 17/831,673 is a continuation of application No. PCT/CN2020/091108, filed on May 19, 2020.
Prior Publication US 2023/0395958 A1, Dec. 7, 2023
Int. Cl. H01M 50/645 (2021.01); H01M 50/148 (2021.01); H01M 50/186 (2021.01); H01M 50/15 (2021.01); H01M 50/60 (2021.01); H01M 50/636 (2021.01)
CPC H01M 50/645 (2021.01) [H01M 50/148 (2021.01); H01M 50/186 (2021.01); H01M 50/15 (2021.01); H01M 50/60 (2021.01); H01M 50/636 (2021.01); H01M 2220/20 (2013.01); Y02E 60/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An end cover assembly for a secondary battery, comprising
an end cover, provided with a through hole for injecting electrolyte therethrough and comprising a connecting portion;
a sealing assembly, configured to seal the through hole;
a locking-fixing member, configured to be movable relative to the connecting portion in a radial direction of the through hole, so as to realize switching between a locked state and an unlocked state of the locking-fixing member and the connecting portion, wherein in the locked state, the locking-fixing member presses against the sealing assembly to restrict the end cover from being separated from the sealing assembly; in the unlocked state, the end cover and the sealing assembly are separable to allow the electrolyte to be injected from the through hole;
wherein the locking-fixing member is snap-fitted with the connecting portion, so that the locking-fixing member and the connecting portion are in the locked state;
wherein the sealing assembly comprises a position-limiting member and a sealing member, the sealing member seals the through hole, and the sealing member is arranged between the position-limiting member and the end cover;
the position-limiting member comprises a pressing-against portion and a position-limiting portion, the pressing-against portion is connected to the position-limiting portion and covers at least a part of the sealing member, and the locking-fixing member presses against the position-limiting portion to restrict the end cover from being separated from the sealing assembly;
wherein the end cover further comprises a body portion, and the connecting portion is a boss protruding from a surface of the body portion; wherein the through hole is located outside the connecting portion and penetrates the body portion in its own axial direction; each of the position-limiting member and the sealing member has an annular structure and is sleeved and connected to the connecting portion.