US 12,119,698 B2
Control unit, battery pack, and power supply device
Shunichiro Sugimori, Tokyo (JP); Yusuke Kusagaya, Tokyo (JP); and Takashi Kabasawa, Tokyo (JP)
Assigned to FDK CORPORATION, Tokyo (JP)
Filed by FDK CORPORATION, Tokyo (JP)
Filed on Jul. 7, 2021, as Appl. No. 17/305,401.
Claims priority of application No. 2020-123934 (JP), filed on Jul. 20, 2020.
Prior Publication US 2022/0021231 A1, Jan. 20, 2022
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/007182 (2020.01) [H02J 7/0048 (2020.01); H02J 7/0071 (2020.01)] 7 Claims
OG exemplary drawing
 
1. A control unit for controlling operation of a charge-discharge circuit that charges or discharges a secondary battery, the control unit comprising:
a controller and a plurality of switching elements configured to control power supply for causing the charge-discharge circuit to operate;
a driving power source that supplies drive power to the controller;
a voltage measurer configured to measure a battery voltage of the secondary battery; and
a battery indicator configured to estimate a remaining battery capacity of the secondary battery from the battery voltage of the secondary battery measured by the voltage measurer,
wherein:
the battery indicator estimates the remaining battery capacity when the controller turns on the plurality of switching elements to start power supply from the control unit to the charge-discharge circuit based on the battery voltage detected at a timing when the controller turns on the plurality of switching elements to start the power supply from the control unit to the charge-discharge circuit, and
the controller turns off the plurality of switching elements to stop the power supply from the control unit (CU) to the charge-discharge circuit after the discharge of the secondary battery by the charge-discharge circuit is ended and at a timing when the battery voltage measured by the voltage measurer is stabilized.