KR-20260064481-A - APPARATUS FOR DIAGNOSING BATTERY AND METHOD THEREOF

KR20260064481AKR 20260064481 AKR20260064481 AKR 20260064481AKR-20260064481-A

Abstract

A battery diagnostic device according to one embodiment of the present document includes a memory for storing at least one instruction and at least one processor for executing said at least one instruction, and said at least one processor can obtain a reference negative data set of a reference negative battery cell, obtain a reference positive data set of a reference positive battery cell, obtain cell data of a target battery cell, and diagnose the state of said target battery cell based on said reference negative data set, said reference positive data set, and said cell data.

Inventors

김혜영
최현준
김영덕
김태현

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20250721
Priority Date: 20241031

Claims (16)

Memory for storing at least one instruction; and It includes at least one processor that executes the above at least one instruction, and The above-mentioned at least one processor is, Acquire a reference cathode data set of a reference cathode battery cell, and Acquire a reference anode data set of a reference anode battery cell, and Acquire cell data of the target battery cell, and Based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, the method is configured to identify the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired. Battery diagnostic device.
In claim 1, The above-mentioned at least one processor is, Based on the above reference cathode data set and the above reference anode data set, identify the reference data set of a reference entire battery cell that is a full cell, and Configured to identify the temperature of the cathode and the temperature of the anode based on the above reference data set and the above cell data, Battery diagnostic device.
In claim 1, The above-mentioned at least one processor is, The above cell data is divided into multiple sections, and Identifying section data that is included in at least a portion of the cell data and is included in any one of the plurality of sections, and Based on the above reference cathode data set, the above reference anode data set, and the above interval data, Configured to identify the temperature of the cathode and the temperature of the anode in any one of the above sections, Battery diagnostic device.
In claim 2, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge/discharge rate among a plurality of designated charge/discharge rates, and The above anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified temperatures and a specific charge/discharge rate among the plurality of specified charge/discharge rates, The above-mentioned at least one processor is, Based on the above reference cathode data subset and the above reference anode data subset, a reference data subset included in the above reference data set is obtained, and Each reference data included in the above reference data subset is fitted to the cell data such that the deviation between each reference data and the cell data is minimized, and Identifying a first specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data, and Among the plurality of specified temperatures, configured to identify the temperature of the cathode and the temperature of the anode based on the temperature corresponding to the first specific reference cathode data corresponding to the first specific reference data and the temperature corresponding to the first specific reference anode data corresponding to the first specific reference data. Battery diagnostic device.
In claim 4, The above-mentioned at least one processor is, Before obtaining the above reference cathode data subset, identify the first reference cathode data of the reference cathode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference cathode data of the reference cathode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and Based on the first reference cathode data and the second reference cathode data, configured to identify a subset of the reference cathode data corresponding to each of the plurality of designated temperatures, Battery diagnostic device.
In claim 4, The above-mentioned at least one processor is, Before obtaining the above reference anode data subset, identify the first reference anode data of the reference anode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference anode data of the reference anode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and Based on the first reference anode data and the second reference anode data, configured to identify the reference anode data subset corresponding to each of the plurality of designated temperatures, Battery diagnostic device.
In claim 2, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated charge/discharge rates and a specific temperature among a plurality of designated temperatures, The above reference anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified charge/discharge rates and a specific temperature among the plurality of specified temperatures, The above-mentioned at least one processor is, Based on the above reference cathode data subset and the above reference anode data subset, a reference data subset included in the above reference data set is obtained, and Each reference data included in the above reference data subset is fitted to the cell data such that the deviation between each reference data and the cell data is minimized, and Identifying a second specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data, and Among the plurality of specified temperatures, configured to identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on the charge/discharge rate corresponding to the second specific reference cathode data corresponding to the second specific reference data and the charge/discharge rate corresponding to the second specific reference anode data corresponding to the second specific reference data. Battery diagnostic device.
In claim 2, The above-mentioned at least one processor is, Each reference cathode data included in the above reference cathode data set, and each reference anode data included in the above reference anode data set, are Includes voltage profile and capacitance profile, A configuration for identifying the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference cathode data from the voltage profile of the reference anode data. Battery diagnostic device.
Operation of acquiring a reference negative data set of a reference negative battery cell; Operation of acquiring a reference positive data set of a reference positive battery cell; Operation of acquiring cell data of a target battery cell; and Based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, Battery diagnostic method.
In claim 9, Based on the above reference negative electrode data set, the above reference positive electrode data set, and the above cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, is, An operation to identify a reference data set of a reference entire battery cell that is a full cell based on the above reference negative electrode data set and the above reference positive electrode data set; and The operation of identifying the temperature of the cathode and the temperature of the anode based on the above reference data set and the above cell data, Battery diagnostic method.
In claim 9, Based on the above reference negative electrode data set, the above reference positive electrode data set, and the above cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, is, The operation of dividing the above cell data into multiple sections; An operation to identify section data that is included in at least a portion of the cell data and is included in any one of the plurality of sections; and Based on the reference cathode data set, the reference anode data set, and the interval data, the operation of identifying the temperature of the cathode and the temperature of the anode in any one of the intervals, Battery diagnostic method.
In claim 10, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge/discharge rate among a plurality of designated charge/discharge rates, and The above anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified temperatures and a specific charge/discharge rate among the plurality of specified charge/discharge rates, Based on the above reference data set and the cell data, the operation of identifying the temperature of the cathode and the temperature of the anode is, An operation to obtain a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset; An operation of fitting each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized; An operation to identify a first specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data; and Among the plurality of specified temperatures, the method includes an operation of identifying the temperature of the cathode and the temperature of the anode based on the temperature corresponding to the first specific reference cathode data corresponding to the first specific reference data and the temperature corresponding to the first specific reference anode data corresponding to the first specific reference data. Battery diagnostic method.
In claim 12, Based on the above reference cathode data subset and the above reference anode data subset, the operation of obtaining a reference data subset included in the reference data set is, Before obtaining the reference cathode data subset above, an operation of identifying the first reference cathode data of the reference cathode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference cathode data of the reference cathode battery cell obtained at the highest second temperature among the plurality of designated temperatures; and Based on the first reference cathode data and the second reference cathode data, the operation of identifying a subset of the reference cathode data corresponding to each of the plurality of designated temperatures, Battery diagnostic method.
In claim 12, Based on the above reference cathode data subset and the above reference anode data subset, the operation of obtaining a reference data subset included in the reference data set is, Before obtaining the reference anode data subset, the operation of identifying the second reference anode data of the reference anode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the third reference anode data of the reference anode battery cell obtained at the highest second temperature among the plurality of designated temperatures; and Based on the second reference anode data and the third reference anode data, the operation of identifying a subset of the reference anode data corresponding to each of the plurality of designated temperatures, Battery diagnostic method.
In claim 9, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated charge/discharge rates and a specific temperature among a plurality of designated temperatures, The above reference anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified charge/discharge rates and a specific temperature among the plurality of specified temperatures, An operation to obtain a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset; An operation of fitting each reference data to the cell data such that the deviation between each reference data included in the above reference data subset and the cell data is minimized; An operation to identify a second specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data; and Among the plurality of specified temperatures, the method further includes an operation of identifying the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on the charge/discharge rate corresponding to the second specific reference cathode data corresponding to the second specific reference data and the charge/discharge rate corresponding to the second specific reference anode data corresponding to the second specific reference data. Battery diagnostic method.
In claim 10, Each reference cathode data included in the above reference cathode data set, and each reference anode data included in the above reference anode data set, are Includes voltage profile and capacitance profile, Based on the above reference negative electrode data set and the above reference positive electrode data set, the operation of identifying a reference data set of a reference entire battery cell that is a full cell is, The operation of identifying the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference cathode data from the voltage profile of the reference anode data. Battery diagnostic method.

Description

Battery Diagnostic Apparatus and Method Thereof The embodiments disclosed in this document relate to a battery diagnostic device and a method thereof. Recently, active research and development on secondary batteries has been underway. Here, secondary batteries are rechargeable batteries that can be interpreted to encompass conventional Ni/Cd and Ni/MH batteries, as well as recent lithium-ion batteries. With their scope of application expanding to include power sources for electric vehicles, they are garnering attention as a next-generation energy storage medium. With the proliferation of various electronic devices due to the Fourth Industrial Revolution, battery usage is rapidly increasing. Batteries are gaining prominence as an essential energy source in various fields, such as electric vehicles, portable electronic devices, and renewable energy storage systems. Consequently, the importance of battery condition diagnostic technology to improve battery performance and reliability is growing. In particular, technology is being developed to identify the temperature of each battery cell included in a battery unit. By identifying the temperature and resistance of each battery cell, the battery condition diagnostic performance of the battery diagnostic device can be improved. This enables the optimization of battery performance and ensures the quality stability of the battery cells by inspecting for abnormalities. FIG. 1 is a block diagram showing a battery pack in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 2 is a block diagram showing the configuration of a battery diagnostic device in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 3 illustrates an example of a graph showing reference positive electrode data, reference negative electrode data, reference data, and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 4 illustrates an example of a graph showing a reference positive electrode data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 5 illustrates an example of a graph showing a reference negative data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 6 illustrates an example of fitting between reference data and interval data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 7 illustrates an example of a table showing deviations between each fitted reference data and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 8 illustrates an example of a graph showing the actual temperature and the identified temperature of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 9 illustrates an example of the flow of operation of a battery diagnostic device for identifying the temperature and relative resistance of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. FIG. 10 is a block diagram showing the hardware configuration of a computing system performing a battery diagnostic method in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document. Some embodiments disclosed herein are described below with reference to the various embodiments of the accompanying drawings. However, this is not intended to limit the technology to specific embodiments and should be understood to include various modifications, equivalents, and/or alternatives to embodiments of the technology. It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the various embodiments disclosed in this document, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. The singular form of a noun corresponding to an item may include one or more items unless the relevant context clearly indicates otherwise. In describing the components of the embodiments of this document, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components and do not limit the essence, order, or sequence of the c