Battery management apparatus and method

Patent metadata

Field	Value
Publication number	US-2023318057-A1
Application number	US-202118013159-A
Country	US
Kind code	A1
Filing date	Jun 23, 2021
Priority date	Sep 4, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

A battery management apparatus includes: a measuring unit to measure voltage and capacity of a battery cell; a profile generating unit to generate a battery profile representing a correspondence between the voltage and the capacity measured by the measuring unit and generate a positive electrode profile of the battery cell based on the generated battery profile and a reference negative electrode profile and a reference negative electrode differential profile preset for the battery cell; and a control unit configured to receive the generated positive electrode profile from the profile generating unit, derive a conversion function representing conversion information from the reference positive electrode profile to the generated positive electrode profile, generate a positive electrode prediction profile for the battery cell from the reference positive electrode profile based on the derived conversion function, and generate a battery prediction profile for the battery cell based on the generated positive electrode prediction profile.

First claim

1 . A battery management apparatus, comprising:
a measuring circuit configured to measure voltage and capacity of a battery cell; a profile generator configured to generate a battery profile representing a correspondence between the voltage and the capacity measured by the measuring circuit, to generate a positive electrode profile of the battery cell based on the generated battery profile, and to generate a reference negative electrode profile and a reference negative electrode differential profile preset for the battery cell; and a controller configured to receive the generated positive electrode profile from the profile generator, to derive a conversion function representing conversion information from the reference positive electrode profile preset for the battery cell to the generated positive electrode profile, to generate a positive electrode prediction profile for the battery cell from the reference positive electrode profile based on the derived conversion function, and to generate a battery prediction profile for the battery cell based on the generated positive electrode prediction profile.

2 . The battery management apparatus according to claim 1 ,
wherein the profile generator is further configured to convert the battery profile into a battery differential profile representing a correspondence between the capacity and a differential voltage for the capacity, to adjust the reference negative electrode differential profile to correspond to the battery differential profile, to adjust the reference negative electrode profile to correspond to the adjusted negative electrode differential profile, and to generate the positive electrode profile based on the adjusted negative electrode profile and the battery profile.

3 . The battery management apparatus according to claim 2 ,
wherein the profile generator is further configured to determine a plurality of reference peaks in the battery differential profile and to adjust the reference negative electrode differential profile such that a capacity of a plurality of target peaks preset in the reference negative electrode differential profile becomes identical to a capacity of a corresponding reference peak.

4 . The battery management apparatus according to claim 3 ,
wherein the profile generator is further configured to adjust the reference negative electrode differential profile by adjusting an offset corresponding to a minimum capacity of the reference negative electrode differential profile and a scale representing an entire capacity region of the reference negative electrode differential profile.

5 . The battery management apparatus according to claim 4 ,
wherein the profile generator is further configured to adjust the reference 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 reference negative electrode profile.

6 . The battery management apparatus according to claim 2 ,
wherein the controller is further configured to generate the battery prediction profile by calculating a difference between a voltage of the positive electrode prediction profile and a voltage of the adjusted negative electrode profile for the same capacity.

7 . The battery management apparatus according to claim 1 ,
wherein the controller is further configured to generate the battery prediction profile by calculating a difference between a voltage of the positive electrode prediction profile and a voltage of the reference negative electrode profile for the same capacity.

8 . The battery management apparatus according to claim 1 ,
wherein the conversion function is configured to convert a voltage per capacity of the reference positive electrode profile into a voltage per capacity of the generated positive electrode profile, for the same capacity.

9 . The battery management apparatus according to claim 1 ,
wherein if the conversion function is provided in plurality, the controller is further configured to derive a conversion prediction function based on a voltage change amount per capacity between the plurality of conversion functions and generate the positive electrode prediction profile by applying the derived conversion prediction function to the reference positive electrode profile.

10 . The battery management apparatus according to claim 9 ,
wherein the controller is further configured to derive the conversion prediction function for a target point and to generate the positive electrode prediction profile for the target point by applying the derived conversion prediction function to the reference positive electrode profile.

11 . The battery management apparatus according to claim 9 ,
wherein the profile generator is further configured to generate the battery profile and generate the positive electrode profile at every preset cycle, and wherein the controller is further configured to derive a conversion function between each of a plurality of positive electrode profiles generated by the profile generator until a current cycle and the reference positive electrode profile, to derive the conversion prediction function based on the plurality of derived conversion functions, to generate the positive electrode prediction profile by using the derived conversion prediction function and the reference positive electrode profile until a next cycle arrives, and then to generate the battery prediction profile.

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

13 . A battery management method, comprising:
measuring voltage and capacity of a battery cell; generating a battery profile representing a correspondence between the measured voltage and the measured capacity of the battery cell; a positive electrode profile generating step of generating a positive electrode profile of the battery cell based on the generated battery profile and generating a reference negative electrode profile and a reference negative electrode differential profile preset for the battery cell; deriving a conversion function representing conversion information from the reference positive electrode profile preset for the battery cell to the generated positive electrode profile; generating a positive electrode prediction profile for the battery cell from the reference positive electrode profile based on the derived conversion function; and generating a battery prediction profile for the battery cell based on the generated positive electrode prediction profile.

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

• 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

• G01R31/388 Primary

  involving voltage measurements · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title

• G01R31/392

  Determining battery ageing or deterioration, e.g. state of health · 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