Battery management system, battery pack, electric vehicle and battery management method

Patent metadata

Field	Value
Publication number	US-2023369660-A1
Application number	US-202218029862-A
Country	US
Kind code	A1
Filing date	Jul 8, 2022
Priority date	Jul 8, 2021
Publication date	Nov 16, 2023
Grant date	—

Abstract

A battery management system according to the present disclosure includes a swelling detector including at least one sensor configured to detect a swelling status of a battery cell; and a control circuit configured to generate first time-series data of the swelling status repeatedly detected during a charging procedure included in a charge/discharge cycle of the battery cell. The control circuit is configured to determine a first change amount of the swelling status in the charging procedure from the first time-series data. The control circuit is configured to determine whether the battery cell is shorted internally based on the first change amount.

First claim

1 . A battery management system, comprising:
a swelling detector including at least one sensor configured to detect a swelling status of a battery cell; and a control circuit configured to generate first time-series data of the swelling status repeatedly detected during a charging procedure included in a charge/discharge cycle of the battery cell, wherein the control circuit is further configured to:
determine a first change amount of the swelling status by the charging procedure from the first time-series data, and
determine whether the battery cell is shorted internally based on the first change amount.

2 . The battery management system according to claim 1 , wherein the swelling status is a thickness of the battery cell or a load acting on the battery cell.

3 . The battery management system according to claim 1 , wherein the control circuit is further configured to determine, as the first change amount, a difference between a minimum swelling status and a maximum swelling status of the first time-series data or a difference between the swelling status detected at a predetermined time after a start time of the charging procedure and the maximum swelling status of the first time-series data.

4 . The battery management system according to claim 1 , wherein the control circuit is further configured to determine that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount.

5 . The battery management system according to claim 1 , wherein the control circuit is further configured to:
generate second time-series data of the swelling status repeatedly detected during a discharging procedure included in the charge/discharge cycle, the discharging procedure being performed after the charging procedure, determine a second change amount of the swelling status from the first time-series data and the second time-series data, wherein the second change amount is a difference between a minimum swelling status of the first time-series data and a minimum swelling status of the second time-series data, and determine whether the battery cell is shorted internally based on the first change amount and the second change amount.

6 . The battery management system according to claim 5 , wherein the control circuit is further configured to determine that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount, and the second change amount is equal to or larger than a second threshold change amount.

7 . The battery management system according to claim 5 , further comprising:
a current detector configured to detect a battery current flowing through the battery cell, wherein the control circuit is further configured to:
generate third time-series data of the battery current repeatedly detected during the charging procedure,
generate fourth time-series data of the battery current repeatedly detected during the discharging procedure,
determine a first accumulated quantity of the battery current in the charging procedure from the third time-series data and a second accumulated quantity of the battery current in the discharging procedure from the fourth time-series data, and
determine that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount, the second change amount is equal to or larger than a second threshold change amount, and a ratio of the second accumulated quantity to the first accumulated quantity is less than a threshold ratio.

8 . The battery management system according to claim 1 , wherein the control circuit is further configured to:
determine a first average change rate of the swelling status in an early stage of the charging procedure and a second average change rate of the swelling status in a late stage of the charging procedure after the early stage from the first time-series data, and determine that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount, and a ratio of the second average change rate to the first average change rate is equal to or larger than a threshold ratio.

9 . A battery pack comprising the battery management system according to claim 1 .

10 . An electric vehicle comprising the battery pack according to claim 9 .

11 . A battery management method, comprising:
detecting a swelling status of a battery cell; generating first time-series data of the swelling status of the battery cell repeatedly detected during a charging procedure included in a charge/discharge cycle of the battery cell; determining a first change amount of the swelling status from the first time-series data; and determining whether the battery cell is shorted internally based on the first change amount.

12 . The battery management method according to claim 11 , wherein the determining of the first change amount of the swelling status comprises determining, as the first change amount, a difference between a minimum swelling status and a maximum swelling status of the first time-series data or a difference between the swelling status detected at a predetermined time after a start time of the charging procedure and the maximum swelling status of the first time-series data.

13 . The battery management method according to claim 11 , wherein the determining of whether the battery cell is shorted internally comprises determining that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount.

14 . The battery management method according to claim 11 , further comprising:
generating second time-series data of the swelling status repeatedly detected during a discharging procedure included in the charge/discharge cycle, the discharging procedure being performed after the charging procedure; and determining a second change amount of the swelling status from the first time-series data and the second time-series data, wherein the second change amount is a difference between a minimum swelling status of the first time-series data and a minimum swelling status of the second time-series data, wherein the determining of whether the battery cell is shorted internally comprises determining whether the battery cell is shorted internally based on the first change amount and the second change amount.

15 . The battery management method according to claim 14 , further comprising:
generating third time-series data of a battery current flowing through the battery cell repeatedly detected during the charging procedure; generating fourth time-series data of the battery current repeatedly detected during the discharging procedure; and determining a first accumulated quantity of the battery current in the charging procedure and a second accumulated quantity of the battery current in the discharging procedure from the third time-series data and the fourth time-series data, wherein the determining of whether the battery cell is shorted internally comprises determining that the battery cell is shorted internally if the first change amount is equal to or larger than a first threshold change amount, the second change amount is equal to or larger than a second threshold change amount, and a ratio of the second accumulated quantity to the first accumulated quantity is less than a threshold ratio.

16 . The battery management method of claim 14 , wherein the determining of whether the battery cell is shorted internally comprises determining that the battery cell is shorted intern

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Ji-Eun
• Choi Young-Eun
• Lee Eun-Ju

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H01M10/425 Primary

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