US 12,266,924 B2
Protection circuit for battery management system
Yue Li, Novi, MI (US); Steve Gierlach, Novi, MI (US); Weiwei Lin, Hangzhou (CN); Brian Large, Novi, MI (US); Jiaping Zhang, Hangzhou (CN); and Ke Xu, Hangzhou (CN)
Assigned to A123 SYSTEMS LLC, Novi, MI (US)
Filed by A123 Systems LLC, Novi, MI (US)
Filed on Apr. 18, 2023, as Appl. No. 18/302,743.
Application 18/302,743 is a division of application No. 17/342,447, filed on Jun. 8, 2021, granted, now 11,670,938.
Claims priority of provisional application 63/042,963, filed on Jun. 23, 2020.
Claims priority of provisional application 63/036,346, filed on Jun. 8, 2020.
Prior Publication US 2023/0253781 A1, Aug. 10, 2023
Int. Cl. H01M 10/42 (2006.01); B60L 50/60 (2019.01); B60L 58/10 (2019.01); H02H 1/00 (2006.01); H02H 7/18 (2006.01)
CPC H02H 7/18 (2013.01) [B60L 50/66 (2019.02); B60L 58/10 (2019.02); H01M 10/4257 (2013.01); H02H 1/0007 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for managing current flow through a cutoff circuit of a battery pack, the method comprising:
flowing a current from a first battery terminal to an external load and preventing current flow from a second battery terminal to the first battery terminal when the cutoff circuit is closed;
responsive to detecting the current between the battery pack and the cutoff circuit greater than a threshold current, flowing the current from a first node that is coupled to a control input of the cutoff circuit to a second node that is coupled to an output of the cutoff circuit while preventing current flow across the control input to the output; and
responsive to detecting the current between the battery pack and the cutoff circuit less than or equal to the threshold current, not flowing the current from the first node to the second node.