US 12,461,160 B2
Battery management device, and electric power system
Emha Bayu Miftahullatif, Tokyo (JP); Toru Kouno, Tokyo (JP); Hiroya Fujimoto, Tokyo (JP); Yutaka Ueda, Tokyo (JP); and Katsutoshi Kondo, Tokyo (JP)
Assigned to Hitachi High-Tech Corporation, Tokyo (JP)
Appl. No. 18/287,485
Filed by Hitachi High-Tech Corporation, Tokyo (JP)
PCT Filed Mar. 30, 2022, PCT No. PCT/JP2022/015907
§ 371(c)(1), (2) Date Oct. 19, 2023,
PCT Pub. No. WO2022/230576, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 2021-075636 (JP), filed on Apr. 28, 2021.
Prior Publication US 2024/0125860 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/3835 (2019.01); H01M 10/42 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/3835 (2019.01) [H01M 10/425 (2013.01); H02J 7/0048 (2020.01); H01M 2010/4271 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A battery management device that manages a state of a battery, comprising:
a detector that acquires a detected value of a voltage outputted from the battery; and
a processor that estimates a state of the battery,
wherein the processor identifies a first period from a start time point at or after an end time point when the battery finishes charging or discharging to a first time point when a first duration has elapsed from the start time point,
wherein the processor identifies a second period that starts at a time point after the end time point and that ends at a second time point after an end time of the first period,
wherein the processor acquires, as a second period difference, a difference of an output voltage of the battery from start of the second period to end of the second period,
wherein the processor acquires a relationship between the second period difference and a state of the battery,
wherein the processor refers to the relationship using the second period difference, thereby estimating a state of the battery,
wherein the processor acquires, as a first period difference, a difference of the output voltage from start of the first period to end of the first period, and
wherein if a ratio of the first period difference to the second period difference is at or above a first threshold, the processor estimates that the battery is not in a normal state.