US 11,808,815 B2
Battery state estimation device, battery state estimation method, and battery system
Shinya Nishikawa, Osaka (JP); Tohru Watanabe, Gifu (JP); and Takashi Iida, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/311,373
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Nov. 13, 2019, PCT No. PCT/JP2019/044535
§ 371(c)(1), (2) Date Jun. 7, 2021,
PCT Pub. No. WO2020/129478, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-236658 (JP), filed on Dec. 18, 2018.
Prior Publication US 2022/0026498 A1, Jan. 27, 2022
Int. Cl. G01R 31/3842 (2019.01); G01R 31/367 (2019.01); B60L 58/12 (2019.01); H02J 7/00 (2006.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01); H02J 7/02 (2016.01)
CPC G01R 31/3842 (2019.01) [B60L 58/12 (2019.02); G01R 31/367 (2019.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H02J 7/0048 (2020.01); H01M 2220/20 (2013.01); H02J 7/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A battery state estimation device comprising:
a voltage measuring unit that measures a voltage of a battery cell;
a current measuring unit that measures a current flowing through the battery cell; and
a controller that
estimates an open circuit voltage (OCV) of the battery cell based on the voltage measured by the voltage measuring unit, the current measured by the current measuring unit, and an equivalent circuit model based on electrochemistry of the battery cell, and
estimates a state of charge (SOC) of the battery cell based on (i) the estimated OCV, (ii) SOC-OCV characteristics on a charge side of the battery cell, and (iii) SOC-OCV characteristics on a discharge side of the battery cell,
wherein
at least one of a positive electrode and negative electrode of the battery cell is a mixed electrode containing a plurality of materials, and
the controller
estimates a current flowing through a material in which capacity-OCV characteristics are different between the charge side and the discharge side, the material being included in the plurality of materials contained in the mixed electrode, and
determines a ratio between the SOC-OCV characteristics on the charge side and the SOC-OCV characteristics on the discharge side based on the current.