US 11,791,640 B2
Overdischarge prevention circuit of secondary battery and secondary battery module
Munehiro Kozuma, Atsugi (JP); and Takayuki Ikeda, Atsugi (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Appl. No. 17/298,698
Filed by Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
PCT Filed Dec. 5, 2019, PCT No. PCT/IB2019/060459
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/128702, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-237087 (JP), filed on Dec. 19, 2018; and application No. 2018-240100 (JP), filed on Dec. 21, 2018.
Prior Publication US 2022/0052541 A1, Feb. 17, 2022
Int. Cl. H02J 7/00 (2006.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01)
CPC H02J 7/00306 (2020.01) [H01M 10/44 (2013.01); H01M 10/48 (2013.01); H02J 7/0031 (2013.01); H02J 7/0047 (2013.01); H01M 2220/20 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An overdischarge prevention circuit of a secondary battery, comprising:
a charging control circuit electrically connected to the secondary battery;
a disconnecting transistor between the secondary battery and the charging control circuit;
a first transistor whose source is electrically connected to a wiring connecting the secondary battery and the disconnecting transistor;
a second transistor connected to a wiring connecting the disconnecting transistor and the charging control circuit; and
a third transistor whose drain or source is connected to a gate of the second transistor.