US 12,148,899 B2
Battery system
Masatsugu Kawakami, Shizuoka-ken (JP); and Yasumasa Oguma, Shizuoka-ken (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 14, 2023, as Appl. No. 18/539,633.
Application 18/539,633 is a continuation of application No. 17/329,444, filed on May 25, 2021, granted, now 11,881,567.
Claims priority of application No. 2020-102286 (JP), filed on Jun. 12, 2020.
Prior Publication US 2024/0113347 A1, Apr. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/48 (2006.01); G01R 31/3835 (2019.01); G01R 31/3842 (2019.01); H02J 7/00 (2006.01)
CPC H01M 10/482 (2013.01) [G01R 31/3835 (2019.01); G01R 31/3842 (2019.01); H01M 10/486 (2013.01); H02J 7/0025 (2020.01); H01M 2220/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A process of using a battery system, the battery system comprising:
a battery pack including a plurality of battery cells connected in series,
a monitoring unit configured to monitor a condition of the battery pack, and
a control unit configured to control at least a discharge of the battery pack, and
the monitoring unit includes:
a voltage sensor configured to measure a total voltage of the battery pack,
a current sensor configured to measure a total current of the battery pack, and
a temperature sensor configured to measure a temperature of the battery pack,
the process comprising the control unit:
calculating capacity condition A of the battery pack at a first discharge cutoff voltage based on the total voltage and the total current,
estimating capacity condition B of the battery pack at the first discharge cutoff voltage based on the total current and the temperature,
determining an occurrence of an over discharge based on the capacity condition A and the capacity condition B, and
changing the first discharge cutoff voltage to a second discharge cutoff voltage that is higher than the first discharge cutoff voltage, when the occurrence of the over discharge is determined.