US 12,300,846 B2
Pressure relief mechanism, battery box, battery cell, battery, preparation method and apparatus
Yuqun Zeng, Fujian (CN); Jianxiong Yang, Fujian (CN); Peng Wang, Fujian (CN); Zhijun Guo, Fujian (CN); Quankun Li, Fujian (CN); and Zhanyu Sun, Fujian (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Appl. No. 15/734,545
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
PCT Filed Jul. 10, 2020, PCT No. PCT/CN2020/101445
§ 371(c)(1), (2) Date Dec. 2, 2020,
PCT Pub. No. WO2022/006900, PCT Pub. Date Jan. 13, 2022.
Prior Publication US 2022/0013851 A1, Jan. 13, 2022
Int. Cl. H01M 50/317 (2021.01); H01M 50/147 (2021.01); H01M 50/209 (2021.01); H01M 50/342 (2021.01); H01M 50/531 (2021.01)
CPC H01M 50/317 (2021.01) [H01M 50/147 (2021.01); H01M 50/209 (2021.01); H01M 50/3425 (2021.01); H01M 50/531 (2021.01); H01M 2220/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pressure relief mechanism for a battery box, comprising:
a connecting mechanism comprising an aperture, a first boss and a second boss,
wherein the first boss is connected to an inner wall of the aperture and extends toward an axis of the aperture, the first boss and the connecting mechanism formed as the same component,
wherein the second boss is connected to an outer wall of the connecting mechanism and extends away from the axis of the aperture, the second boss being configured to be connected to the battery box, and
wherein the first boss comprises:
a first surface that extends toward the axis of the aperture; and
a second surface that extends toward the axis of the aperture,
wherein the second surface opposes the first surface and is separated from the first surface by a thickness of the first boss along the axis of the aperture, and
wherein the second surface is arranged closer to the second boss along the axis of the aperture than the first surface;
a pressure relief sheet configured to be actuated to release an internal pressure of the battery box when the internal pressure reaches a threshold, the pressure relief sheet being arranged on the first surface of the first boss;
a first protective sheet arranged on the second surface of the first boss to be closer to the second boss along the axis of the aperture than the pressure relief sheet to thereby protect the pressure relief sheet from contacting an electrolytic solution in the battery box;
a compression ring configured to press the first protective sheet and arranged on a side of the first protective sheet away from the first boss along the axis of the aperture; and
a pressing structure connected to a surface of the second boss and configured to be pressed toward the axis of the aperture to press the compression ring toward the second surface of the first boss along the axis of the aperture.