CN-122029440-A - Battery diagnosis apparatus and method of operating the same

Abstract

According to an embodiment disclosed in this document, a battery diagnosis apparatus may include an information acquisition unit to acquire voltage information related to each of a plurality of battery cells provided in a tray, and a controller to calculate a voltage drop value of each of the plurality of battery cells based on the voltage information, correct the voltage drop value of each of the plurality of battery cells by using a reference value to correct a voltage deviation according to a position where each of the plurality of battery cells is provided in the tray, and determine a state of each of the plurality of battery cells based on the corrected voltage drop value.

Inventors

• LIU CHENGYE
• LI XIANGWU

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260512

Application Date

20240924

Priority Date

20231016

Claims (17)

1. 1. A battery diagnosis apparatus, the battery diagnosis apparatus comprising: An information acquisition unit configured to acquire voltage information of each of a plurality of battery cells arranged in a tray, and The controller is used for controlling the operation of the controller, the controller is configured to: calculating a voltage drop value for each of the plurality of battery cells based on the voltage information; correcting the voltage drop value of each of the plurality of battery cells by using a reference value for correcting a voltage deviation corresponding to a position where each of the plurality of battery cells is arranged in the tray, and A state of each of the plurality of battery cells is determined based on the corrected voltage drop values.
2. 2. The battery diagnosis device according to claim 1, wherein the plurality of battery cells are arranged in a matrix form in the tray.
3. 3. The battery diagnosis device according to claim 2, wherein the reference value is set based on a voltage drop value of battery cells located in at least one column of the tray.
4. 4. The battery diagnostic apparatus of claim 3 wherein the reference value comprises at least one of a median value and an average value of voltage drop values of battery cells located in at least one column of the tray.
5. 5. The battery diagnosis device according to claim 2, wherein the controller is further configured to correct the voltage drop value of each of the plurality of battery cells for each column of the tray such that a median value of voltage drop values of battery cells arranged in the corresponding column is the reference value.
6. 6. The battery diagnostic apparatus of claim 5 wherein the controller is further configured to correct the voltage drop values by, for each column of the tray, adding a difference between the reference value and a median of the voltage drop values of the battery cells located in the corresponding column to a voltage drop value of each of the battery cells located in the corresponding column.
7. 7. The battery diagnostic apparatus of claim 1 wherein the controller is further configured to determine a battery cell for which the corrected voltage drop value exceeds a threshold as defective.
8. 8. The battery diagnosis device according to claim 1, wherein the information acquisition unit is further configured to acquire the voltage information of each of the plurality of battery cells during activation.
9. 9. The battery diagnostic apparatus of claim 8 wherein the controller is further configured to calculate, for each of the plurality of battery cells, a difference between voltage values before and after a room temperature aging process in the activation process as the voltage drop value.
10. 10. The battery diagnosis device of claim 1, wherein the controller is further configured to provide the result of the determination to a user.
11. 11. A battery diagnosis method, comprising the steps of: Acquiring voltage information of each of a plurality of battery cells arranged in a tray; calculating a voltage drop value for each of the plurality of battery cells based on the voltage information; correcting the voltage drop value of each of the plurality of battery cells by using a reference value for correcting a voltage deviation corresponding to a position where each of the plurality of battery cells is arranged in the tray, and A state of each of the plurality of battery cells is determined based on the corrected voltage drop values.
12. 12. The battery diagnosis method according to claim 11, wherein the plurality of battery cells are arranged in a matrix form in the tray, and The reference value is set based on a voltage drop value of battery cells located in at least one column of the tray.
13. 13. The battery diagnostic method of claim 12 wherein the reference value comprises at least one of a median and an average of voltage drop values of battery cells located in at least one column of the tray.
14. 14. The battery diagnosis method according to claim 12, wherein the step of correcting the voltage drop value of each of the plurality of battery cells includes correcting the voltage drop value of each of the plurality of battery cells for each column of the tray such that a median value of voltage drop values of battery cells arranged in the corresponding column is the reference value.
15. 15. The battery diagnosis method according to claim 14, wherein the step of correcting the voltage drop value of each of the plurality of battery cells includes correcting the voltage drop value by adding, for each column of the tray, a difference between the reference value and a median value of the voltage drop values of the battery cells located in the corresponding column to a voltage drop value of each of the battery cells located in the corresponding column.
16. 16. The battery diagnostic method of claim 11, wherein determining the status of each of the plurality of battery cells comprises determining the battery cell for which the corrected voltage drop value exceeds a threshold as defective.
17. 17. The battery diagnosis method according to claim 11, wherein the step of calculating a voltage drop value of each of the plurality of battery cells includes calculating, for each of the plurality of battery cells, a difference between voltage values before and after a room temperature aging process in an activation process as the voltage drop value.

Description

Battery diagnosis apparatus and method of operating the same Technical Field Cross Reference to Related Applications The present application claims priority and rights of korean patent application No. 10-2023-0134948 filed on the korean intellectual property office on day 10 and 16 of 2023, the entire contents of which are incorporated herein by reference. Technical Field Embodiments disclosed herein relate to a battery diagnosis apparatus and a method of operating the same. Background Recently, research and development of secondary batteries have been actively conducted. Herein, the secondary battery, which is a chargeable/dischargeable battery, may include all conventional nickel (Ni)/cadmium (Cd) batteries, ni/Metal Hydride (MH) batteries, etc., as well as recent lithium ion batteries. Among secondary batteries, lithium ion batteries have much higher energy density than conventional Ni/Cd batteries, ni/MH batteries, and the like. Further, lithium ion batteries can be manufactured to be small and light in weight, so that the lithium ion batteries have been used as power sources for mobile devices, and recently, their use ranges have been expanded to power sources for electric vehicles, thereby attracting attention as next-generation energy storage media. The battery may be diagnosed to classify defective cells in terms of factors that may affect the quality of the battery during the manufacturing process of the battery. In particular, during the activation of the battery, a process of classifying the defective battery may be performed. In this case, when a plurality of battery cells are diagnosed according to absolute standards, there is a risk of missing and overdetection due to deviation of each battery cell or the like. Disclosure of Invention Technical problem Embodiments disclosed herein are directed to a battery diagnosis apparatus and an operating method thereof, in which characteristic deviation between battery cells can be corrected to perform diagnosis, thereby reducing omission and overdriving and improving diagnosis performance. The technical problems of the embodiments disclosed herein are not limited to the above-described technical problems, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art from the following description. Technical proposal A battery diagnosis apparatus according to embodiments disclosed herein includes an information acquisition unit configured to acquire voltage information of each of a plurality of battery cells arranged in a tray, and a controller configured to calculate a voltage drop value of each of the plurality of battery cells based on the voltage information, correct the voltage drop value of each of the plurality of battery cells by using a reference value for correcting a voltage deviation corresponding to a position where each of the plurality of battery cells is arranged in the tray, and determine a state of each of the plurality of battery cells based on the corrected voltage drop value. According to an embodiment, the plurality of battery cells may be arranged in a matrix form in the tray. According to an embodiment, the reference value may be set based on a voltage drop value of battery cells located in at least one column of the tray. According to an embodiment, the reference value may include at least one of a median value and an average value of voltage drop values of battery cells located in at least one column of the tray. According to an embodiment, the controller may be further configured to correct the voltage drop value of each of the plurality of battery cells for each column of the tray such that a median value of the voltage drop values of the battery cells arranged in the corresponding column is the reference value. According to an embodiment, the controller may be further configured to correct the voltage drop value by adding, for each column of the tray, a difference between the reference value and a median value of the voltage drop values of the battery cells located in the corresponding column to a voltage drop value of each of the battery cells located in the corresponding column. According to an embodiment, the controller may be further configured to determine a battery cell for which the corrected voltage drop value exceeds a threshold value as defective. According to an embodiment, the information obtaining unit may be further configured to obtain the voltage information of each of the plurality of battery cells during activation. According to an embodiment, the controller may be further configured to calculate, for each of the plurality of battery cells, a difference between voltage values before and after a room temperature aging process in the activation process as the voltage drop value. According to an embodiment, the controller may be further configured to provide the result of the determination to a user. A battery diagnosis method according to embodiments disclosed herei