US 12,451,704 B2
Electricity storage device control circuit and backup power supply system including same
Shohei Yamanaka, Osaka (JP); Yasuhiro Iijima, Osaka (JP); and Yohsuke Mitani, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/257,459
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 20, 2021, PCT No. PCT/JP2021/047003
§ 371(c)(1), (2) Date Jun. 14, 2023,
PCT Pub. No. WO2022/145270, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 2020-218538 (JP), filed on Dec. 28, 2020.
Prior Publication US 2024/0030722 A1, Jan. 25, 2024
Int. Cl. H02J 7/00 (2006.01); H02J 7/34 (2006.01)
CPC H02J 7/0016 (2013.01) [H02J 7/0047 (2013.01); H02J 7/007182 (2020.01); H02J 7/345 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electricity storage device control circuit comprising:
a voltage detector configured to detect voltages of a plurality of electricity storage devices;
a voltage controller configured to perform a cell balance operation by controlling the voltages of the plurality of electricity storage devices based on a detection result by the voltage detector; and
a plurality of control circuits, each of which is connected in parallel to a corresponding one of the plurality of electricity storage devices, wherein:
each of the plurality of control circuits includes a resistor and a circuit breaker which are connected in series to each other, and
in a charge mode, in which the plurality of electricity storage devices are connected to a primary power supply different from the plurality of electricity storage devices and receive electric power from the primary power supply, the cell balance operation includes controlling the circuit breaker of each of the plurality of control circuits to charge an electricity storage device exhibiting a lowest voltage among the plurality of electricity storage devices by a current flowing through the resistance of each of one or more of the plurality of control circuits other than a control circuit provided to the electricity storage device exhibiting the lowest voltage, while maintaining voltages of one or more remaining electricity storage devices other than the electricity storage device exhibiting the lowest voltage.