US 11,990,778 B2
Secondary battery protection circuit and secondary battery anomaly detection system
Takayuki Ikeda, Kanagawa (JP); Munehiro Kozuma, Kanagawa (JP); Takanori Matsuzaki, Kanagawa (JP); Ryota Tajima, Kanagawa (JP); Shunpei Yamazaki, Tokyo (JP); and Yuki Okamoto, Kanagawa-ken (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Appl. No. 17/258,957
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
PCT Filed Jun. 27, 2019, PCT No. PCT/IB2019/055428
§ 371(c)(1), (2) Date Jan. 8, 2021,
PCT Pub. No. WO2020/012284, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 2018-131018 (JP), filed on Jul. 10, 2018; and application No. 2018-141302 (JP), filed on Jul. 27, 2018.
Prior Publication US 2021/0126473 A1, Apr. 29, 2021
Int. Cl. H02J 7/00 (2006.01); H01M 10/42 (2006.01)
CPC H02J 7/0031 (2013.01) [H01M 10/4235 (2013.01); H02J 7/0036 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A secondary battery protection circuit comprising:
a first memory circuit electrically connected to a secondary battery;
a comparison circuit electrically connected to the first memory circuit;
a second memory circuit electrically connected to the comparison circuit; and
a power-off switch electrically connected to the second memory circuit,
wherein the power-off switch is electrically connected to the secondary battery,
wherein the first memory circuit comprises a first transistor comprising an oxide semiconductor, and
wherein the first transistor is configured to retain a voltage value of the secondary battery in an analog manner.