US 12,244,025 B2
Secondary battery and battery module
Dongyang Shi, Ningde (CN); Yuanbao Chen, Ningde (CN); Ning Chen, Ningde (CN); Haizu Jin, Ningde (CN); Zhenhua Li, Ningde (CN); and Fei Hu, 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 Mar. 12, 2020, as Appl. No. 16/817,289.
Application 16/817,289 is a continuation of application No. PCT/CN2019/075827, filed on Feb. 22, 2019.
Claims priority of application No. 201811636967.3 (CN), filed on Dec. 29, 2018.
Prior Publication US 2020/0212379 A1, Jul. 2, 2020
Int. Cl. H01M 50/15 (2021.01); H01M 10/0525 (2010.01); H01M 50/147 (2021.01); H01M 50/176 (2021.01)
CPC H01M 50/15 (2021.01) [H01M 10/0525 (2013.01); H01M 50/147 (2021.01); H01M 50/176 (2021.01)] 20 Claims
OG exemplary drawing
 
1. A secondary battery, comprising an electrode assembly, a case and a cap assembly;
the case having an accommodating cavity, the accommodating cavity having an opening, and the electrode assembly being accommodated in the accommodating cavity;
the electrode assembly comprising electrode units, and the electrode units being stacked in an axial direction of the accommodating cavity;
the cap assembly comprising a cap plate and a vent piece, the cap plate having a length and a width, the cap plate being connected with the case and positioned at a side of the electrode assembly in the axial direction;
the cap plate being provided with a through-hole at a central region of the cap plate in a length direction of the cap plate, the through-hole overlapping a middle point of the cap plate in the length direction, the through-hole having a shape with a maximum spacing oriented along a width direction of the cap plate, the vent piece being connected with the cap plate and covering the through-hole;
the cap plate having a first inner surface at a side close to the electrode assembly, the vent piece having a second inner surface at a side close to the electrode assembly, and the second inner surface being positioned at a side of the first inner surface away from the electrode assembly; and
the cap assembly further comprising a protecting piece, and the protecting piece being mounted to a top surface of the cap plate from outside and covering the through-hole, and the vent piece being connected to a bottom surface of the cap plate positioned at the side of the first inner surface away from the electrode assembly.