US 11,923,707 B2
Battery protection circuit, power storage device, and electric device
Shunpei Yamazaki, Tokyo (JP); Takayuki Ikeda, Kanagawa (JP); Munehiro Kozuma, Kanagawa (JP); Takanori Matsuzaki, Kanagawa (JP); Akio Suzuki, Kanagawa (JP); and Seiya Saito, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., (JP)
Appl. No. 17/293,215
Filed by Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
PCT Filed Nov. 6, 2019, PCT No. PCT/IB2019/059520
§ 371(c)(1), (2) Date May 12, 2021,
PCT Pub. No. WO2020/099984, PCT Pub. Date May 22, 2020.
Claims priority of application No. 2018-215129 (JP), filed on Nov. 16, 2018; application No. 2018-224703 (JP), filed on Nov. 30, 2018; and application No. 2018-239482 (JP), filed on Dec. 21, 2018.
Prior Publication US 2022/0052535 A1, Feb. 17, 2022
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/0029 (2013.01) [H02J 7/00712 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A battery protection circuit comprising a switch circuit for controlling charge and discharge of a battery cell,
wherein the switch circuit comprises a mechanical relay, a first transistor, and a second transistor,
wherein the switch circuit has a function of controlling electrical connection between a first terminal and a second terminal,
wherein the mechanical relay has a function of breaking electrical connection between the first terminal and the second terminal,
wherein the first transistor has a function of supplying first current between the first terminal and the second terminal,
wherein the second transistor has a function of supplying second current between the first terminal and the second terminal, and
wherein the first current is higher than the second current.