Battery Management Apparatus and Method

Patent metadata

Field	Value
Publication number	US-2023280403-A1
Application number	US-202117926309-A
Country	US
Kind code	A1
Filing date	Sep 8, 2021
Priority date	Sep 9, 2020
Publication date	Sep 7, 2023
Grant date	—

Abstract

A battery management apparatus and method performs appropriate control to increase the lifespan of a battery cell by judging whether degradation of the battery cell is accelerated. Since both the voltage change pattern and the differential capacity change pattern between the plurality of peaks included in the plurality of differential profiles are considered, there is an advantage that it is possible to accurately determine whether the state of the battery cell is in a degradation accelerated state.

First claim

1 . A battery management apparatus, comprising:
controller; and memory having stored thereon instructions that, when executed, are configured to cause the controller to:
obtain a plurality of differential profiles for the battery cell at different cycles of the battery cell, each differential profile representing a relationship between voltages and differential capacities corresponding to the voltages during the respective cycle,
for each differential profile, select a respective peak included in a preset voltage region of the differential profile,
determine each of a voltage change pattern and a differential capacity change pattern of the respective selected peaks; and
determine whether degradation of the battery cell is accelerated according to whether the determined voltage change pattern corresponds to a preset first reference pattern and whether the determined differential capacity change pattern corresponds to a preset second reference pattern.

2 . The battery management apparatus according to claim 1 ,
wherein the instructions are configured to cause the controller to determine the voltage change pattern and the differential capacity change pattern for each respective pair of peaks in consecutively obtained differential profiles.

3 . The battery management apparatus according to claim 2 ,
wherein the first reference pattern is a rate of voltage increase equal to or greater than a preset threshold voltage, and wherein the instructions are configured to cause the controller to determine that the voltage change pattern corresponds to the first reference pattern based on the determined voltage change pattern the voltage difference between the respective pair of peaks being equal to or greater than the threshold voltage.

4 . The battery management apparatus according to claim 2 ,
wherein the second reference pattern is an increase in differential capacity, and wherein the instructions are configured to cause the controller to determine that the differential capacity change pattern corresponds to the second reference pattern based on the determined differential capacity change increasing.

5 . The battery management apparatus according to claim 1 ,
wherein the instructions are configured to cause the controller to order the determined voltage change patterns and differential capacity change patterns according to a cycle order of the battery cell, and to determine whether degradation of the battery cell is accelerated based on an analysis of the ordered determined voltage change patterns and differential capacity change patterns.

6 . The battery management apparatus according to claim 5 ,
wherein the instructions are configured to cause the controller to determine at least one target peak at which the voltage change pattern corresponds to the first reference pattern and the differential capacity change pattern corresponds to the second reference pattern.

7 . The battery management apparatus according to claim 6 ,
wherein the instructions are configured to cause the controller to determine that degradation of the battery cell is accelerated from an earliest cycle corresponding to the at least one target peak.

8 . The battery management apparatus according to claim 6 ,
wherein the instructions are configured to cause the controller to set a discharge end voltage for the battery cell to be equal to or greater than a voltage corresponding to the at least one target peak.

9 . The battery management apparatus according to claim 1 ,
wherein the preset voltage region is a partial region of a voltage region for the battery cell.

10 . A battery pack, comprising the battery management apparatus according to claim 1 .

11 . A battery management method, comprising:
obtaining, by a controller, a plurality of differential profiles for the battery cell at different cycles of the battery cell, each differential profile representing a relationship between voltages and differential capacities corresponding to the voltages during the respective cycle for each differential profile, selecting, by the controller, a respective peak included in a preset voltage region of the differential profile; determining, by the controller, each of a voltage change pattern and a differential capacity change pattern of the respective selected peaks; and determining, by the controller, whether degradation of the battery cell is accelerated according to whether the determined voltage change pattern corresponds to a preset first reference pattern and whether the determined differential capacity change pattern corresponds to a preset second reference pattern.

Assignees

• Lg Energy Solution Ltd

Inventors

• Jeong Hee-Seok
• Bae Yoon-Jung
• Cha A-Ming

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H02J7/0047

  Electricity · mapped topic