US 12,092,698 B2
Degradation-determination system and method for determining degradation of secondary battery
Shigemi Masuda, Shizuoka (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
Filed on Sep. 6, 2022, as Appl. No. 17/929,850.
Application 17/929,850 is a continuation of application No. 17/260,733, granted, now 11,467,221, previously published as PCT/JP2019/030528, filed on Aug. 2, 2019.
Claims priority of application No. 2018-147714 (JP), filed on Aug. 6, 2018.
Prior Publication US 2022/0413060 A1, Dec. 29, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/392 (2019.01); G01L 1/20 (2006.01); G01L 1/22 (2006.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/392 (2019.01) [G01L 1/205 (2013.01); G01L 1/22 (2013.01); H01M 10/48 (2013.01); H02J 7/0047 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A degradation-determination system for a secondary battery comprising:
four strain gauges installed on a principal surface of one or more surfaces of the secondary battery, each of the strain gauges being configured to detect pressure of a battery surface at a corresponding installation position, and a position of each strain gauge being represented by two-dimensional coordinates of the principal surface of the secondary battery; and
a degradation determining unit configured to determine degradation of the secondary battery based on measured values by the four strain gauges,
wherein the degradation determining unit is configured to estimate, based on the measured values by the four strain gauges and coordinate positions of the four strain gauges, a maximum expansion position where volume expansion is maximal in a region defined by the four strain gauges, of the one or more surfaces of the secondary battery, and
wherein the degradation determining unit is configured to
determine, based on the measured values by the four strain gauges, a deviation amount derived by the measured values, relative to a reference point of the principal surface of the secondary battery, and
estimate a position offset from the reference point by the deviation amount as the maximum expansion position.