	US 12,191,458 B2
	Protection method and device for secondary battery, secondary battery, battery module, battery pack, and electric apparatus
Ting Li, Ningde (CN); Haizu Jin, Ningde (CN); Shaojun Niu, Ningde (CN); Huaichao Tang, Ningde (CN); and Longqing Peng, 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. 1, 2024, as Appl. No. 18/592,946.
Application 18/592,946 is a continuation of application No. PCT/CN2022/099137, filed on Jun. 16, 2022.
Prior Publication US 2024/0258584 A1, Aug. 1, 2024
Int. Cl. H01M 10/42 (2006.01); C23C 16/02 (2006.01); C23C 16/34 (2006.01); C23C 16/40 (2006.01); C23C 16/44 (2006.01); C23C 16/505 (2006.01); C23C 16/56 (2006.01); H01M 10/04 (2006.01)

CPC H01M 10/4235 (2013.01) [C23C 16/0245 (2013.01); C23C 16/345 (2013.01); C23C 16/401 (2013.01); C23C 16/403 (2013.01); C23C 16/405 (2013.01); C23C 16/407 (2013.01); C23C 16/4408 (2013.01); C23C 16/505 (2013.01); C23C 16/56 (2013.01); H01M 10/0404 (2013.01)]

18 Claims

1. A protection method for a secondary battery comprising an injection opening, the method comprising:

step (1): evacuating the secondary battery through the injection opening to within 100 kPa, optionally to within 100 Pa;

step (2): introducing a first reactant into the secondary battery through the injection opening until a pressure in the secondary battery rises by more than 1 Pa, optionally more than 1 kPa, and maintaining the pressure for more than 1 ms, optionally for 0.1s-600s; and optionally

step (3): evacuating the secondary battery through the injection opening to within 100 kPa again, optionally to within 100 Pa; and

step (4): introducing a second reactant into the secondary battery through the injection opening until the pressure rises by more than 1 Pa, optionally more than 1 kPa, and maintaining the pressure for more than 1 ms, optionally for 0.1s-600s;

wherein the second reactant is capable of reacting with the first reactant to form a protection layer on an internal surface of the secondary batter battery.