US 11,892,515 B2
Determination device relating to plurality of batteries, electricity storage system, determination method and non-transitory storage medium
Yumi Fujita, Tokyo (JP); Tomokazu Morita, Funabashi Chiba (JP); and Nobukatsu Sugiyama, Kawasaki Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Jan. 14, 2022, as Appl. No. 17/576,728.
Application 17/576,728 is a continuation of application No. PCT/JP2021/008318, filed on Mar. 4, 2021.
Claims priority of application No. 2020-149664 (JP), filed on Sep. 7, 2020.
Prior Publication US 2022/0137151 A1, May 5, 2022
Int. Cl. G01R 31/392 (2019.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01)
CPC G01R 31/392 (2019.01) [H01M 10/425 (2013.01); H01M 10/4285 (2013.01); H01M 10/482 (2013.01); H01M 2010/4271 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A determination device relating to a plurality of batteries which are connected in series, comprising:
a processor configured to determine a deterioration variance among the batteries, based on first voltage data indicative of a maximum voltage which is greatest among voltages of the batteries in each of measurements in a plurality of periods in charge or discharge of the batteries, and second voltage data indicative of a minimum voltage which is least among the voltages of the batteries in each of the measurements in the periods,
wherein the processor is configured to:
estimate a first internal state parameter as an internal state of the battery as an elemental battery, the first internal state parameter being based on a variation of the maximum voltage in the first voltage data;
estimate a second internal state parameter as an internal state of the battery as the elemental battery, the second internal state parameter being based on a variation of the minimum voltage in the second voltage data;
determine the deterioration variance among the batteries, based on at least the first internal state parameter and the second internal state parameter;
estimate a third internal state parameter indicative of an internal state in an entirety of a series-connected part of the batteries, based on at least third voltage data indicative of a voltage of the series-connected part of the batteries in each of the measurements in the periods in the charge or the discharge of the batteries; and
determine the deterioration variance among the batteries by comparing the third internal state parameter with the first internal state parameter and the second internal state parameter.