US 12,266,923 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. 18/302,732.
Application 18/302,732 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 2023/0253780 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)] 20 Claims
OG exemplary drawing
 
1. A battery management system, comprising:
a protection circuit comprising a low-current leakage junction transistor and an over voltage clamping diode; and
an n-channel MOSFET comprising a drain terminal, a gate terminal, and a source terminal,
where the drain terminal is directly coupled to a positive supply line of a battery pack,
where the source terminal is directly coupled to the low-current leakage junction transistor, the source terminal further coupled to the over voltage clamping diode to dissipate current away from the n-channel MOSFET when the n-channel MOSFET is switched to OFF, and
where the gate terminal is coupled to the low-current leakage junction transistor,
wherein the protection circuit is configured to, responsive to detection of a voltage greater than a voltage of the battery pack, switch the n-channel MOSFET from an ON state to an OFF state and maintain the OFF state.