Battery management apparatus and method

Patent metadata

Field	Value
Publication number	US-11990590-B2
Application number	US-202118019401-A
Country	US
Kind code	B2
Filing date	Jun 3, 2021
Priority date	Aug 14, 2020
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A battery management apparatus and method according to an embodiment of the present disclosure is directed to obtaining a positive electrode profile and a negative electrode profile for a battery cell in a non-destructive manner by appropriately adjusting a preset negative electrode profile. According to one aspect of the present disclosure, by using the battery profile and the adjusted negative electrode profile for the degraded battery cell, there is an advantage that the positive electrode profile of the degraded battery cell may be easily estimated in a non-destructive manner.

First claim

What is claimed is:

1. A battery management apparatus, comprising:
a measuring circuit configured to measure voltage and capacity of a battery cell;
a profile generator configured to receive a voltage value for the measured voltage and a capacity value for the measured capacity from the measuring circuit and to generate a battery profile representing a correspondence between the voltage value and the capacity value;
a profile converter configured to receive the battery profile from the profile generator and to convert the received battery profile into a battery differential profile representing a correspondence between the capacity value and a differential voltage value for the capacity value; and
a controller configured to:
determine at least one reference peak in the battery differential profile,
have a negative electrode profile and a negative electrode differential profile preset for a negative electrode of the battery cell,
adjust the negative electrode differential profile so that at least one target peak preset for the negative electrode differential profile corresponds to the determined reference peak,
adjust the negative electrode profile to correspond to the adjusted negative electrode differential profile, and
generate a positive electrode profile of the battery cell based on the adjusted negative electrode profile and the battery profile.

2. The battery management apparatus according to claim 1 ,
wherein the controller is further configured to determine a plurality of reference peaks in the battery differential profile and to adjust the negative electrode differential profile to be the same as a capacity value of a reference peak, among the plurality of reference peaks, to which capacity values of a plurality of target peaks preset in the negative electrode differential profile correspond.

3. The battery management apparatus according to claim 2 ,
wherein the controller is further configured to adjust the negative electrode differential profile while changing an offset corresponding to a minimum capacity value of the negative electrode differential profile and a scale representing an entire capacity region of the negative electrode differential profile.

4. The battery management apparatus according to claim 3 ,
wherein the controller is further configured to adjust the negative electrode profile to correspond to the adjusted negative electrode differential profile by applying change information of the offset and the scale for the adjusted negative electrode differential profile to the negative electrode profile.

5. The battery management apparatus according to claim 1 ,
wherein the controller is further configured to generate the positive electrode profile by adding the voltage value of the battery profile and the voltage value of the adjusted negative electrode profile for each identical capacity value.

6. The battery management apparatus according to claim 1 ,
wherein the controller is further configured to select a first capacity region and a second capacity region in an entire capacity region of the battery profile, to determine a first reference peak in the first capacity region of the battery profile, and to determine a second reference peak in the second capacity region of the battery profile.

7. The battery management apparatus according to claim 6 ,
wherein the controller is further configured to determine:
a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the first capacity region of the battery profile is 0 and whose differential voltage value is greatest as the first reference peak, and
a peak at which an instantaneous change rate of the differential voltage value for the capacity value in the second capacity region of the battery profile is 0 and whose differential voltage value is greatest as the second reference peak.

8. The battery management apparatus according to claim 1 ,
wherein the negative electrode profile is a profile preset to represent a correspondence between the capacity value and a negative electrode voltage value of the battery cell, and
wherein the negative electrode differential profile is a profile preset to represent a correspondence between the capacity value and a differential negative electrode voltage value of the negative electrode voltage value for the capacity value.

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

10. A battery management method, comprising:
measuring voltage and capacity of a battery cell;
generating a battery profile representing a correspondence between a voltage value for the measured voltage and a capacity value for the measured capacity;
converting the battery profile into a battery differential profile representing a correspondence between the capacity value and a differential voltage value for the capacity value;
determining at least one reference peak in the battery differential profile;
adjusting a negative electrode differential profile so that at least one target peak preset for the negative electrode differential profile of the battery cell provided in advance corresponds to the determined reference peak;
adjusting a negative electrode profile of the battery cell provided in advance to correspond to the adjusted negative electrode differential profile; and
generating a positive electrode profile of the battery cell based on the adjusted negative electrode profile and the battery profile.

11. The battery management method according to claim 10 , wherein:
the determining of at least one reference peak includes determining a plurality of reference peaks in the battery differential profile, and
the adjusting of the negative electrode differential profile includes adjusting the negative electrode differential profile to be the same as a capacity value of a reference peak, among the plurality of reference peaks, to which capacity values of a plurality of target peaks preset in the negative electrode differential profile correspond.

12. The battery management method according to claim 11 ,
wherein the adjusting of the negative electrode differential profile includes adjusting the negative electrode differential profile while changing an offset corresponding to a minimum capacity value of the negative electrode differential profile and a scale representing an entire capacity region of the negative electrode differential profile.

13. The battery management method according to claim 12 ,
wherein the adjusting of the negative electrode profile includes adjusting the negative electrode profile to correspond to the adjusted negative electrode differential profile by applying change information of the offset and the scale for the adjusted negative electrode differential profile to the negative electrode profile.

14. The battery management method according to claim 10 ,
wherein the generating of the positive electrode profile includes generating the positive electrode profile by adding the voltage value of the battery profile and the voltage value of the adjusted negative electrode profile for each identical capacity value.

15. The battery management method according to claim 10 , wherein the determining of at least one reference peak includes:
selecting a first capacity region and a second capacity region in an entire capacity region of the battery profile,
determining a first reference peak in the first capacity region of the battery profile, and
determining a second reference peak in the second capacity region of the battery profile.

16. The battery management method according to cla

Assignees

• Lg Energy Solution Ltd

Inventors

• Yoon Du-Seong
• Koh Dong-Wook
• Lim Jin-Hyung
• Jun Gwang-Hoon
• Choi Jeong-Mi
• Bae Yoon-Jung

Classifications

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · 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

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title