US 11,949,119 B2
Cover assembly of secondary battery and secondary battery
Quankun Li, Ningde (CN); Shiyao Zhang, 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 Jul. 14, 2020, as Appl. No. 16/928,523.
Claims priority of application No. 201910729374.X (CN), filed on Aug. 8, 2019.
Prior Publication US 2021/0043901 A1, Feb. 11, 2021
Int. Cl. H01M 50/325 (2021.01); H01M 50/147 (2021.01); H01M 50/155 (2021.01); H01M 50/183 (2021.01); H01M 50/184 (2021.01); H01M 50/30 (2021.01); H01M 50/358 (2021.01); H01M 50/383 (2021.01)
CPC H01M 50/325 (2021.01) [H01M 50/147 (2021.01); H01M 50/155 (2021.01); H01M 50/183 (2021.01); H01M 50/184 (2021.01); H01M 50/358 (2021.01); H01M 50/383 (2021.01); H01M 50/394 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A cover assembly of a secondary battery, comprising:
a cover plate comprising a gas vent;
a pressing block provided with a center hole opposite to the gas vent;
a gas exhaust valve configured to seal the gas vent and create a thermal deformation in response to an increase in temperature to get out of a state of sealing the gas vent; and
a protective part at least partially covering the gas vent and having a gas permeability coefficient smaller than a gas permeability coefficient of the gas exhaust valve,
wherein a first protrusion is provided on a surface of the cover plate facing the gas exhaust valve, and the first protrusion presses against the gas exhaust valve; and the first protrusion is located at a side of a connection portion of the protective part close to the gas vent, and
wherein a second protrusion is provided on a surface of the pressing block facing the gas exhaust valve, and the second protrusion presses against the gas exhaust valve; and the second protrusion is located at a side of the connection portion facing away from the gas vent.