CN-122003613-A - Battery abnormality diagnosis apparatus and method

Abstract

According to the battery abnormality diagnosis device of the embodiment of the invention, for diagnosing whether each of a plurality of batteries in a battery system is abnormal, the device can monitor the state of the batteries, individually measure the voltage of the batteries when the state of at least one of the batteries satisfies a predetermined diagnosis condition, individually balance the batteries, and diagnose the occurrence of abnormality in at least one of the batteries based on the voltage change before and after each of the batteries is balanced.

Inventors

• LIN JINYU

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20250512

Priority Date

20240614

Claims (17)

1. 1. A battery abnormality diagnosis apparatus for diagnosing whether each of a plurality of batteries in a battery system is abnormal, the battery abnormality diagnosis apparatus comprising: At least one processor, and A memory for storing at least one instruction for execution by the at least one processor; wherein the at least one instruction comprises: instructions to monitor a status of the battery; Instructions to measure the voltage of the batteries individually when the status of at least one of the batteries satisfies a predetermined diagnostic condition; Instructions to perform individual balancing on the battery, and Instructions to diagnose occurrence of an abnormality in at least one of the batteries based on voltage changes before and after each of the batteries is balanced.
2. 2. The battery abnormality diagnosis device according to claim 1, wherein the balancing is performed independently of balancing performed by a battery management device to solve an unbalanced state of the battery in the battery system.
3. 3. The battery abnormality diagnostic device according to claim 2, wherein the instructions to diagnose the occurrence of an abnormality in at least one of the batteries include: instructions to group the batteries into at least one battery group based on the individually measured voltage values of the batteries; instructions to measure the voltage of each of the cells individually after balancing; instructions for separately calculating the voltage difference of each cell measured before and after balancing, and An instruction to diagnose whether an abnormality has occurred in a corresponding battery by comparing the voltage difference value of the corresponding battery with the voltage difference value of each of the batteries in the battery pack to which the battery belongs to derive a comparison value, and comparing the comparison value with a reference voltage drop value predetermined for the corresponding battery pack.
4. 4. The battery abnormality diagnosis device according to claim 3, wherein the instruction to diagnose whether abnormality has occurred in the corresponding battery includes: Instructions for calculating the comparison value by subtracting the voltage difference value of the corresponding battery from an average value of the voltage difference values of the respective batteries in a battery pack to which the corresponding battery belongs; an instruction for counting the number of occurrences of the event having the comparison value lower than the reference voltage drop value, and And if the counted number of times of the corresponding battery is greater than or equal to a predetermined threshold number, determining an instruction that the corresponding battery is abnormal.
5. 5. The battery abnormality diagnostic device according to claim 1, wherein the instructions to individually measure the voltage of the battery include: An instruction to compare the voltage of the battery with a predefined voltage for performing balancing, and If the voltage of the battery exceeds the predefined voltage for performing balancing, then the instructions of the voltage of each of the batteries are measured individually.
6. 6. The battery abnormality diagnostic device according to claim 5, wherein the instructions to individually measure the voltage of the battery include: An instruction to check the open time of the battery when the voltage of the battery exceeds the voltage predefined for performing balancing, and Instructions to individually measure the voltage of each of the cells when the open time of the cells exceeds a predetermined open time.
7. 7. The battery abnormality diagnostic device according to claim 1, wherein the instruction to perform individual balancing of the battery includes: And executing independent balancing on the battery until a command that a predetermined balancing completion condition is satisfied.
8. 8. The battery abnormality diagnostic device according to claim 7, wherein the balance completion condition includes: at least one of a time during which the balance is maintained in the operation state, a time during which the balance termination state is maintained, and the number of times the balance is performed.
9. 9. A battery abnormality diagnosis method using a battery abnormality diagnosis device for diagnosing whether each of a plurality of batteries in a battery system is abnormal, the battery abnormality diagnosis method comprising: Monitoring the state of the battery; Measuring the voltage of the battery individually when the state of at least one of the batteries satisfies a predetermined diagnostic condition; performing individual balancing on the cells, and Diagnosing occurrence of an abnormality in at least one of the batteries based on a voltage change before and after each of the batteries is balanced.
10. 10. The battery abnormality diagnosis method according to claim 9, wherein the balancing is performed independently of balancing performed by a battery management device to solve an unbalanced state of the battery in the battery system.
11. 11. The battery abnormality diagnosis method according to claim 10, wherein diagnosing occurrence of an abnormality in at least one of the batteries includes: grouping the cells into at least one battery group based on individually measured voltage values of the cells; Measuring the voltage of each of the cells individually after balancing; Separately calculating the voltage difference of each cell measured before and after balancing, and Diagnosing whether an abnormality has occurred in a corresponding battery by comparing the voltage difference value of the corresponding battery with the voltage difference value of each of the batteries in the battery pack to which the battery belongs to derive a comparison value, and comparing the comparison value with a reference voltage drop value predetermined for the corresponding battery pack.
12. 12. The battery abnormality diagnosis method according to claim 11, wherein diagnosing whether an abnormality has occurred in the corresponding battery includes: calculating the comparison value by subtracting the voltage difference value of the corresponding battery from an average value of the voltage difference values of the respective batteries in a battery pack to which the corresponding battery belongs; Counting the number of occurrences of events for which the comparison value is below the reference voltage drop value, and If the counted number of times of the corresponding battery is greater than or equal to a predetermined threshold number, it is determined that the corresponding battery is abnormal.
13. 13. The battery abnormality diagnosis method according to claim 9, wherein individually measuring the voltage of the battery includes: comparing the voltage of the battery with a voltage predefined for performing balancing, and If the voltage of the battery exceeds the voltage predefined for performing balancing, the voltage of each of the batteries is measured separately.
14. 14. The battery abnormality diagnosis method according to claim 13, wherein individually measuring the voltage of the battery includes: checking an open time of the battery when the voltage of the battery exceeds the voltage predefined for performing balancing, and The voltage of each of the cells is measured individually when the open circuit time of the cell exceeds a predetermined open circuit time.
15. 15. The battery abnormality diagnosis method according to claim 9, wherein performing individual balancing on the battery includes: An individual balancing is performed on the battery until a predetermined balancing completion condition is satisfied.
16. 16. The battery abnormality diagnosis method according to claim 15, wherein the balance completion condition includes: at least one of a time during which the balance is maintained in the operation state, a time during which the balance termination state is maintained, and the number of times the balance is performed.
17. 17. A battery system, comprising: a plurality of batteries, and A battery management device configured to manage the plurality of batteries, The battery management apparatus monitors a state of the battery, individually measures a voltage of the battery when the state of at least one of the battery satisfies a predetermined diagnosis condition, performs individual balancing on the battery, and diagnoses occurrence of an abnormality in at least one of the battery based on voltage changes before and after each of the battery is balanced.

Description

Battery abnormality diagnosis apparatus and method Technical Field The present application claims priority and benefit from korean patent application No. 10-2024-007533 filed in the korean intellectual property office on day 6 and 14 of 2024, the entire contents of which are incorporated herein by reference. The present invention relates to a battery abnormality diagnosis apparatus and method and a system including the same, and more particularly, to a battery abnormality diagnosis apparatus and method that performs balancing independently of battery balancing that solves battery imbalance in a battery system to diagnose whether a battery abnormality occurs. Background As fossil fuels are depleted and interest in environmental pollution increases, the importance of environmentally friendly alternative energy sources is increasing. Among the various alternative energy sources, the demand for rechargeable battery systems is rapidly increasing. In response to environmental regulations and high oil price problems, battery systems are being applied to various industrial fields ranging from mobile application devices to vehicles, robots, and energy storage devices. In general, lithium secondary batteries are used for batteries, which cause a risk of fire or explosion if internal or external defects occur. Therefore, it is important to diagnose the state of the battery in real time. A conventional battery system applied to an energy storage system diagnoses whether a battery has an abnormality based on the result of balance control performed to solve unbalance of the battery. However, the balance control in the conventional battery system is performed according to a command of an inverter or a battery system controller as a superior control device or a command of the battery management device itself, and thus, there is a disadvantage in that an abnormality diagnosis time and a diagnosis standard depend on the superior control device. Among the prior art documents relevant to the present invention, KR 10-2020-0009920 has some relevance. Disclosure of Invention [ Technical problem ] In order to avoid one or more of the problems of the related art, embodiments of the present disclosure provide a battery abnormality diagnosis apparatus. To avoid one or more problems of the related art, embodiments of the present disclosure also provide a battery abnormality diagnosis method. To avoid one or more problems of the related art, embodiments of the present disclosure also provide a battery system. Technical scheme To achieve the object of the present disclosure, a battery abnormality diagnosis apparatus for diagnosing whether each of a plurality of batteries in a battery system is abnormal may include at least one processor, and a memory configured to store at least one instruction executed by the at least one processor, the at least one instruction may include an instruction to monitor a state of the battery, an instruction to individually measure a voltage of the battery when the state of the at least one of the batteries satisfies a predetermined diagnosis condition, an instruction to individually balance the battery, and an instruction to diagnose occurrence of an abnormality in the at least one of the batteries based on a voltage change before and after each of the batteries is balanced. Here, balancing may be performed independently of balancing performed by the battery management apparatus to solve an unbalanced state of the battery in the battery system. Meanwhile, the instructions to diagnose the occurrence of an abnormality in at least one of the batteries may include instructions to group the batteries into at least one battery group based on individually measured voltage values of the batteries, instructions to individually measure a voltage of each of the batteries after balancing, instructions to individually calculate voltage difference values of the respective batteries measured before and after balancing, and instructions to diagnose whether an abnormality has occurred in the corresponding battery by comparing the voltage difference value of the corresponding battery with the voltage difference value of each of the batteries in the battery group to which the battery belongs to derive a comparison value, and comparing the comparison value with a reference voltage drop value predetermined for the corresponding battery group. Here, the instruction to diagnose whether an abnormality has occurred in the corresponding battery may include an instruction to calculate a comparison value by subtracting the voltage difference value of the corresponding battery from an average value of the voltage difference values of the respective batteries in the battery pack to which the corresponding battery belongs, an instruction to count the number of times the event where the comparison value is lower than the reference voltage drop value occurs, and an instruction to determine that the corresponding battery is abnormal if the