US 12,081,049 B2
Battery management circuit, energy storage device, and battery management method
Takashi Ryu, Kyoto (JP)
Assigned to NUVOTON TECHNOLOGY CORPORATION JAPAN, Kyoto (JP)
Filed by Nuvoton Technology Corporation Japan, Kyoto (JP)
Filed on Jan. 20, 2022, as Appl. No. 17/580,030.
Application 17/580,030 is a continuation of application No. PCT/JP2020/027451, filed on Jul. 15, 2020.
Claims priority of application No. 2019-137184 (JP), filed on Jul. 25, 2019.
Prior Publication US 2022/0149635 A1, May 12, 2022
Int. Cl. H02J 7/00 (2006.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01); H02J 7/04 (2006.01); H02J 7/34 (2006.01)
CPC H02J 7/0024 (2013.01) [H01M 10/425 (2013.01); H01M 10/482 (2013.01); H02J 7/0014 (2013.01); H02J 7/04 (2013.01); H02J 7/345 (2013.01); H01M 2010/4271 (2013.01)] 13 Claims
OG exemplary drawing
 
8. A battery management circuit provided for each of sets of battery cells connected in series in an energy storage device including the sets of the battery cells and a capacitor, the battery management circuit comprising:
a positive connection terminal to be connected to a positive electrode of a corresponding one of the sets of the battery cells;
a negative connection terminal to be connected to a negative electrode of the corresponding one of the sets of the battery cells;
a capacitor connection terminal to be connected to a terminal of the capacitor;
a first main switch that connects the capacitor connection terminal to the positive connection terminal;
a second main switch that connects the capacitor connection terminal to the negative connection terminal;
a first sub switch that forms a first path in which a potential difference is generated by a current flowing from the positive connection terminal to the capacitor connection terminal;
a second sub switch that forms a second path in which a potential difference is generated by a current flowing from the capacitor connection terminal to the negative connection terminal; and
a control circuit that performs control to (i) turn on the first main switch in accordance with the potential difference in the first path, and (ii) turn on the second main switch in accordance with the potential difference in the second path.