US 12,449,480 B2
Battery test device and battery charge testing method
Yutaka Tomizawa, Fukushima (JP); Shigeki Nakajima, Fukushima (JP); Toshihiko Takagi, Fukushima (JP); and Hideki Shoji, Fukushima (JP)
Assigned to TOYO SYSTEM CO., LTD., Fukushima (JP)
Appl. No. 18/013,177
Filed by TOYO SYSTEM CO., LTD., Iwaki (JP)
PCT Filed Feb. 24, 2022, PCT No. PCT/JP2022/007741
§ 371(c)(1), (2) Date Dec. 27, 2022,
PCT Pub. No. WO2022/254827, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 2021-094564 (JP), filed on Jun. 4, 2021.
Prior Publication US 2023/0243890 A1, Aug. 3, 2023
Int. Cl. G01R 31/36 (2020.01); G01R 31/3842 (2019.01); H02J 7/00 (2006.01)
CPC G01R 31/3646 (2019.01) [G01R 31/3842 (2019.01); H02J 7/00714 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A battery test device comprising:
a DC power supply unit which outputs a DC voltage;
a full-bridge circuit having a plurality of switching elements, two input terminals to which the DC voltage is applied, and two output terminals to which a positive terminal and a negative terminal of a battery are connected; and
a control unit which duty-ratio controls ON/OFF of each of the plurality of switching elements of the full-bridge circuit in a predetermined cycle to charge the battery by supplying a charging current to the battery through the full-bridge circuit in a charge test mode,
wherein:
in response to a command to start constant current/constant voltage control in the charge test mode, the control unit executes constant current charge control to supply the charging current to the battery in such a manner that the charging current becomes equal to a set current value,
when a voltage between terminals of the positive terminal and the negative terminal of the battery rises up to a set voltage value during the execution of the constant current charge control, the control unit stops the constant current charge control and executes constant voltage charge control to supply the charging current to the battery in such a manner as to maintain the voltage between the terminals at the set voltage value,
when the charging current drops to 0 [A] during the execution of the constant voltage charge control, the control unit stops the constant voltage charge control and executes zero amp control to maintain the charging current at 0 [A], and
when the voltage between the terminals rises above the set voltage value during the execution of the zero amp control, the control unit stops the zero amp control and executes minute discharge control to make a minute discharging current flow out of the battery.