CN-121986271-A - Apparatus and method for diagnosing battery

Abstract

An apparatus for diagnosing a battery according to one embodiment of the present disclosure includes a curve acquisition unit to acquire a battery curve indicating a correspondence between a voltage and a capacity of the battery, a curve adjustment unit to adjust preset reference cathode curves and reference anode curves to correspond to the battery curve, thereby generating adjusted cathode curves and adjusted anode curves, and a control unit to extract diagnostic factors for the battery from the adjusted cathode curves and/or the adjusted anode curves, and to diagnose a state of the battery based on the extracted diagnostic factors.

Inventors

• JIN RONGDE
• JIN DONGXIAN
• JIN ZHIYAN
• JIN TAIXUAN
• Pu Junzhe
• YIN RUILING
• Cui Chunzhu
• Cui Shunjiong
• CUI XIANJUN

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260505

Application Date

20250131

Priority Date

20240131

Claims (15)

1. 1. An apparatus for diagnosing a battery, comprising: A curve obtaining unit configured to obtain a battery curve representing a correspondence relationship between a voltage and a capacity of a battery; A curve adjustment unit configured to adjust preset reference positive and negative electrode curves to correspond to the battery curves, to generate adjusted positive and negative electrode curves, and A control unit configured to extract a diagnostic factor for the battery from at least one of the adjusted positive electrode curve and the adjusted negative electrode curve, and diagnose a state of the battery based on the extracted diagnostic factor.
2. 2. The apparatus for diagnosing a battery according to claim 1, Wherein the control unit is configured to calculate a degradation parameter including at least one of an available lithium loss rate, a positive electrode loss rate, a negative electrode loss rate, and a capacity loss rate based on the extracted diagnostic factor, and diagnose the state of the battery based on the calculated degradation parameter.
3. 3. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to determine a first characteristic value from the adjusted positive electrode curve and calculate the available lithium loss rate based on the first characteristic value, a preset first reference characteristic value, and a preset reference difference value.
4. 4. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to compare the available lithium loss rate with a preset first threshold value, and diagnose the state of the battery as an available lithium loss state based on the comparison result.
5. 5. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to determine a second characteristic value from the adjusted positive electrode curve and calculate the positive electrode loss rate based on the second characteristic value, a preset second reference characteristic value, and a preset reference difference value.
6. 6. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to calculate a positive electrode change rate of the adjusted positive electrode curve, and calculate the positive electrode loss rate based on the positive electrode change rate and a preset reference positive electrode change rate.
7. 7. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to compare the positive electrode loss rate with a preset second threshold value, and diagnose the state of the battery as a positive electrode loss state based on the comparison result.
8. 8. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to calculate a negative electrode change rate of the adjusted negative electrode curve, and calculate the negative electrode loss rate based on the negative electrode change rate and a preset reference negative electrode change rate.
9. 9. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to compare the negative electrode loss rate with a preset third threshold value, and diagnose the state of the battery as a negative electrode loss state based on a comparison result.
10. 10. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to determine a first characteristic value and a second characteristic value from the adjusted positive electrode curve, and calculate the capacity loss rate based on the first characteristic value, the second characteristic value, and a preset reference difference value.
11. 11. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to determine a third characteristic value and a fourth characteristic value from the adjusted negative curve, and calculate the capacity loss rate based on the third characteristic value, the fourth characteristic value, and a preset reference difference value.
12. 12. The apparatus for diagnosing a battery according to claim 2, Wherein the control unit is configured to compare the capacity loss rate with a preset fourth threshold value, and diagnose the state of the battery as a capacity loss state based on the comparison result.
13. 13. A battery pack comprising the apparatus for diagnosing a battery according to any one of claims 1 to 12.
14. 14. A vehicle comprising the apparatus for diagnosing a battery according to any one of claims 1 to 12.
15. 15. A method for diagnosing a battery, comprising: A curve obtaining step of obtaining a battery curve representing a correspondence relationship between a voltage and a capacity of a battery; a curve adjustment step of adjusting a preset reference positive electrode curve and a preset reference negative electrode curve to correspond to the battery curve so as to generate an adjusted positive electrode curve and an adjusted negative electrode curve; A diagnostic factor extraction step of extracting a diagnostic factor for the battery from at least one of the adjusted positive electrode curve and the adjusted negative electrode curve, and A diagnosis step of diagnosing a state of the battery based on the extracted diagnostic factor.

Description

Apparatus and method for diagnosing battery Technical Field The present application is based on and claims priority of korean patent application No.10-2024-0015252 filed on 1 month 31 2024 to the korean intellectual property office, the disclosure of which is incorporated herein by reference in its entirety. The present disclosure relates to an apparatus and method for diagnosing a battery, and more particularly, to an apparatus and method for diagnosing a battery that diagnoses a state of a battery. Background In recent years, demand for portable electronic products such as notebook computers, video cameras, portable telephones has sharply increased, and electric vehicles, energy storage batteries, robots, satellites, and the like have been greatly developed. Accordingly, high-performance batteries allowing repeated charge and discharge are being actively studied. Currently, commercial batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium batteries, and the like. Among them, lithium batteries have been attracting attention because of their almost no memory effect and very low self-discharge rate and high energy density compared to nickel-based batteries. Although a great deal of research is currently being conducted on these batteries in terms of high capacity and high density, improving life and safety are also important. In order to improve battery safety, a technique of accurately diagnosing the current state of the battery is required. Disclosure of Invention Technical problem The present disclosure is designed to solve the problems of the prior art, and thus it is an object of the present disclosure to provide an apparatus and method for diagnosing a state of a battery, which non-destructively diagnoses the state of the battery. These and other objects and advantages of the present disclosure will be understood from the following detailed description, and will become more apparent from, the exemplary embodiments of the present disclosure. Furthermore, it will be readily understood that the objects and advantages of the present disclosure may be realized by means of the instrumentalities shown in the appended claims and combinations thereof. Technical proposal An apparatus for diagnosing a battery according to one aspect of the present disclosure may include a curve obtaining unit configured to obtain a battery curve representing a correspondence between a voltage and a capacity of the battery, a curve adjusting unit configured to adjust preset reference positive and negative electrode curves to correspond to the battery curve to generate an adjusted positive and negative electrode curve, and a control unit configured to extract a diagnostic factor for the battery from at least one of the adjusted positive and negative electrode curves, and diagnose a state of the battery based on the extracted diagnostic factor. The control unit may be configured to calculate a degradation parameter including at least one of an available lithium loss rate, a positive electrode loss rate, a negative electrode loss rate, and a capacity loss rate based on the extracted diagnostic factor, and diagnose a state of the battery based on the calculated degradation parameter. The control unit may be configured to determine a first characteristic value according to the adjusted positive electrode curve, and calculate the available lithium loss rate based on the first characteristic value, a preset first reference characteristic value, and a preset reference difference value. The control unit may be configured to compare the available lithium loss rate with a preset first threshold value, and diagnose the state of the battery as the available lithium loss state based on the comparison result. The control unit may be configured to determine a second characteristic value according to the adjusted positive electrode curve, and calculate the positive electrode loss rate based on the second characteristic value, a preset second reference characteristic value, and a preset reference difference value. The control unit may be configured to calculate a positive electrode change rate of the adjusted positive electrode curve, and calculate a positive electrode loss rate based on the positive electrode change rate and a preset reference positive electrode change rate. The control unit may be configured to compare the positive electrode loss rate with a preset second threshold value, and diagnose the state of the battery as a positive electrode loss state based on the comparison result. The control unit may be configured to calculate a negative electrode change rate of the adjusted negative electrode curve, and calculate a negative electrode loss rate based on the negative electrode change rate and a preset reference negative electrode change rate. The control unit may be configured to compare the negative electrode loss rate with a preset third threshold value, and diagnose the state of the bat