Charging condition setting device and operation method for charging condition setting device

Abstract

The charging condition setting device according to embodiments disclosed herein may include: an extraction unit configured to extract a first critical charging condition for preventing lithium deposition in the battery at a specified temperature; a calculation unit configured to perform a specified number of charges on a first target battery at the specified temperature based on the first critical charging condition, and then calculate a first degree of degradation of the first target battery; and a diagnostic unit configured to diagnose the first critical charging condition based on the calculated first degree of degradation.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0045756, filed on April 4, 2024, the disclosure of which is incorporated herein by reference. Technical Field

[0004] The embodiments disclosed herein relate to a charging condition setting device and an operating method for the charging condition setting device. Background Technology

[0005] In recent years, research and development of rechargeable batteries have been actively pursued. Here, a rechargeable battery is a battery capable of being recharged and discharged, and its meaning includes all existing Ni / Cd batteries, Ni / MH batteries, and more recently, lithium-ion batteries. Among rechargeable batteries, lithium-ion batteries have the advantage of a much higher energy density than existing Ni / Cd and Ni / MH batteries. Furthermore, because lithium-ion batteries can be manufactured in a small and lightweight manner, they are used as power sources for mobile devices, and in recent years, their applications have expanded to include power sources for electric vehicles, making lithium-ion batteries a focus of attention as a next-generation energy storage medium.

[0006] A charging diagram for charging secondary batteries is derived based on resistance and the system's upper current limit. However, with the increase in cell area and capacity, preventing abnormal degradation due to lithium deposition has become a crucial task in ensuring battery life and safety. Therefore, it is necessary to set charging conditions that prevent lithium deposition when the battery is in use. Summary of the Invention

[0007] Technical issues

[0008] The embodiments disclosed herein can provide a charging condition setting device capable of setting charging conditions that prevent lithium deposition when the battery is in use, and an operating method for the charging condition setting device.

[0009] Furthermore, the embodiments disclosed herein may provide a charging condition setting device and an operating method for the charging condition setting device, which is capable of extracting critical charging conditions by performing charging at various charging rates (C-rates) based on each battery temperature and state of charge (SOC), and diagnosing whether the critical charging conditions need to be reset by charging based on the extracted critical charging conditions.

[0010] The technical problems of the embodiments disclosed herein are not limited to those described above, and other purposes not mentioned will be clearly understood by those skilled in the art from the following description.

[0011] Technical solution

[0012] A charging condition setting device according to an embodiment disclosed herein includes: an extraction unit configured to extract a first critical charging condition for preventing lithium deposition in the battery at a specified temperature; a calculation unit configured to perform a specified number of charges on a first target battery at the specified temperature based on the first critical charging condition, and then calculate a first degree of degradation of the first target battery; and a diagnostic unit configured to diagnose the first critical charging condition based on the calculated first degree of degradation.

[0013] In the charging condition setting device according to the embodiments disclosed herein, the extraction unit can perform multiple charging operations on the battery at a specified temperature based on multiple charging rates (C rate) for a specified time to obtain negative electrode charging depth data, and extract a first critical charging condition based on the obtained negative electrode charging depth data.

[0014] In the charging condition setting device according to the embodiments disclosed herein, the extraction unit can extract the critical charging rate at which the difference between the time elapsed during charging and the critical charging depth becomes less than or equal to a specified value, based on the acquired negative electrode charging depth data.

[0015] In a charging condition setting device according to an embodiment disclosed herein, a first critical charging condition may include a charging graph indicating charging conditions based on the state of charge (SOC) of the battery at a specified temperature.

[0016] In the charging condition setting device according to the embodiments disclosed herein, the calculation unit may perform a specified number of charges on the first target battery at a specified temperature based on a first critical charging condition, and then calculate the state of health (SOH) of the first target battery, and compare the calculated SOH with the initial SOH of the first target battery to calculate a first degree of degradation of the first target battery.

[0017] In the charging condition setting device according to the embodiments disclosed herein, the diagnostic unit may: diagnose the first critical charging condition as an impossible condition for preventing lithium deposition when the calculated first degree of degradation is equal to or greater than a threshold, and diagnose the first critical charging condition as a possible condition for preventing lithium deposition when the calculated first degree of degradation is less than the threshold.

[0018] In the charging condition setting device according to the embodiments disclosed herein, when the first critical charging condition is diagnosed as an impossible condition for preventing lithium deposition by the diagnostic unit, the extraction unit can extract a second critical charging condition based on a charging rate lower than the first critical charging condition, the calculation unit can perform a specified number of charges on the second target battery at a specified temperature based on the second critical charging condition, and then calculate a second degree of degradation of the second target battery, and the diagnostic unit can diagnose the second critical charging condition based on the calculated second degree of degradation.

[0019] An operation method for a charging condition setting device according to embodiments disclosed herein includes: extracting a first critical charging condition of a battery at a specified temperature; performing a specified number of charges on a first target battery at the specified temperature based on the first critical charging condition, and then calculating a first degree of degradation of the first target battery; and diagnosing the first critical charging condition based on the calculated first degree of degradation.

[0020] In the operation method of the charging condition setting device according to the embodiments disclosed herein, extracting the first critical charging condition may include performing multiple charging operations on the battery at a specified temperature based on multiple charging rates (C rate) for a specified time to obtain negative electrode charging depth data, and extracting the first critical charging condition based on the obtained negative electrode charging depth data.

[0021] In the operation method for a charging condition setting device according to the embodiments disclosed herein, the extraction of a first critical charging condition may include: extracting a critical charging rate based on acquired negative electrode charging depth data, wherein the difference between the time elapsed during charging and the critical charging depth becomes less than or equal to a specified value.

[0022] In an operation method for a charging condition setting device according to embodiments disclosed herein, a first critical charging condition may include a charging graph indicating charging conditions based on the state of charge (SOC) of the battery at a specified temperature.

[0023] In the operation method of the charging condition setting device according to the embodiments disclosed herein, calculating the first degree of degradation of the first target battery may include performing a specified number of charges on the first target battery at a specified temperature based on a first critical charging condition, and then calculating the state of health (SOH) of the first target battery, and comparing the calculated SOH with the initial SOH of the first target battery to calculate the first degree of degradation of the first target battery.

[0024] In the operation method of the charging condition setting device according to the embodiments disclosed herein, diagnosing the first critical charging condition may include: diagnosing the first critical charging condition as an impossible condition for preventing lithium deposition when the calculated first degree of degradation is equal to or greater than a threshold; and diagnosing the first critical charging condition as a possible condition for preventing lithium deposition when the calculated first degree of degradation is less than the threshold.

[0025] The operation method for the charging condition setting device according to the embodiments disclosed herein may further include: when a first critical charging condition is diagnosed as an impossible condition for preventing lithium deposition, extracting a second critical charging condition based on a charging rate lower than the first critical charging condition, performing a specified number of charges on a second target battery at a specified temperature based on the second critical charging condition, and then calculating a second degree of degradation of the second target battery, and diagnosing the second critical charging condition based on the calculated second degree of degradation.

[0026] Beneficial effects

[0027] According to the embodiments disclosed herein, battery life and safety can be improved by setting charging conditions that prevent lithium deposition at each battery temperature and SOC.

[0028] In addition, various effects can be provided, either directly or indirectly, through this disclosure. Attached Figure Description

[0029] Figure 1 This is a block diagram of a charging condition setting device according to an embodiment.

[0030] Figure 2 This is a view used to describe an example of a charging condition setting device according to an embodiment extracting critical charging conditions for preventing lithium deposition in the battery at a specified temperature.

[0031] Figure 3 This is a view used to describe the critical charging conditions extracted by the charging condition setting device according to the embodiment.

[0032] Figure 4 This is a flowchart of the operation of the charging condition setting device according to an embodiment.

[0033] Figure 5 This is a flowchart of the operation of the charging condition setting device according to an embodiment. Detailed Implementation

[0034] In the following description, various embodiments disclosed in this disclosure will be described with reference to the accompanying drawings. However, this is not intended to limit the disclosure to the specific embodiments, and it should be understood to include various modifications, equivalents, and / or alternatives to the embodiments of this disclosure.

[0035] It should be understood that the various embodiments of this disclosure and the terminology used therein are not intended to limit the technical features set forth herein to the particular embodiments, and include various changes, equivalents, or substitutions in the corresponding embodiments. Regarding the description of the drawings, similar or related reference numerals may be used to refer to similar or related elements. It should be understood that the singular form of the noun corresponding to an item may include one or more things unless the relevant context clearly indicates otherwise.

[0036] As used herein, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B or C” can include any one or all possible combinations of the items enumerated together in the corresponding phrase. Unless otherwise specifically stated, terms such as “first” and “second,” “first,” “second,” “A,” “B,” “(a),” or “(b)” can be used simply to distinguish corresponding components from one other component and do not otherwise limit these components (e.g., in terms of importance or order).

[0037] In this specification, it should be understood that if an element (e.g., a first element) is referred to as "connected to," "coupled to," or "in contact with" another element (e.g., a second element) with or without the terms "operationally" or "communically," it means that the element can be connected to the other element directly (e.g., via wired or wireless) or via a third element.

[0038] According to various embodiments, each of the above-described components (e.g., a module or program) may include a single entity or multiple entities, and some of the multiple entities may be configured separately from the other components. According to various embodiments, one or more components or operations of the above-described components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, the integrated component may still perform one or more functions of each of the multiple components in the same or similar manner as they were performed by a corresponding one of the multiple components prior to integration. According to various embodiments, operations performed by a module, program, or other component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be performed in a different order or omitted, or one or more other operations may be added.

[0039] In the following text, reference will be made to Figures 1 to 3 Various embodiments of the charging condition setting device of this disclosure are described to set and diagnose critical charging conditions for preventing lithium deposition in the battery.

[0040] Figure 1This is a block diagram of a charging condition setting device according to an embodiment. Figure 2 This is a view used to describe an example of a charging condition setting device according to an embodiment extracting critical charging conditions for preventing lithium deposition in the battery at a specified temperature. Figure 3 This is a view used to describe the critical charging conditions extracted by the charging condition setting device according to the embodiment.

[0041] refer to Figure 1 The charging condition setting device 100 may include an extraction unit 110, a calculation unit 120, and a diagnostic unit 130.

[0042] According to an embodiment, the extraction unit 110 can extract the critical charging conditions of the battery at a specified temperature. Here, critical charging conditions may refer to charging conditions used to prevent lithium deposition from the battery. For example, critical charging conditions may include a charging graph indicating charging conditions (e.g., charging rate (C rate)) based on the battery's state of charge (SOC) at the specified temperature.

[0043] According to an embodiment, the extraction unit 110 can extract a first critical charging condition for preventing lithium deposition in the battery at a specified temperature.

[0044] According to an embodiment, the extraction unit 110 can perform multiple charging operations on the battery at a specified temperature based on multiple charging rates for a specified time to obtain negative electrode charging depth data.

[0045] According to an embodiment, the extraction unit 110 can extract a first critical charging condition based on the acquired negative electrode charging depth data. For example, the extraction unit 110 can extract a critical charging rate based on the acquired negative electrode charging depth data, where the difference between the time elapsed during charging and the critical charging depth becomes less than or equal to a specified value. The extraction unit 110 can extract the critical charging rate for each state of charge (SOC) and extract the first critical charging condition constituted by the extracted critical charging rates.

[0046] refer to Figure 2The graph 200 shows the negative electrode depth data acquired by the extraction unit 110. The extraction unit 110 can perform multiple charges on the battery based on multiple charging rates (e.g., 0.9C, 1.1C, or 1.2C) for a specified time (e.g., 60 seconds) under specified conditions (e.g., SOC 70% and temperature 25°C) to obtain negative electrode depth of charge data indicating the depth of charge over time, as shown in the graph 200. The extraction unit 110 can extract the critical charging rate (e.g., 1.0C) where the difference from the critical depth of charge 210 becomes less than or equal to a specified value after 60 seconds during the multiple charges. For example, the extraction unit 110 can extract the critical charging rate of 1.0C from the data by interpolation based on the 0.9C and 1.1C charging rates in the graph 200.

[0047] refer to Figure 3 The graph 300 can be confirmed to show the first critical charging condition extracted by the extraction unit 110. The graph 300 can be a charging graph indicating the critical charging rate according to the battery's SOC for multiple charging times (e.g., 60 seconds, 30 seconds, or 1 second). The extraction unit 110 can extract the critical charging rate for each specific condition (e.g., a specific charging time, a specific SOC, or a specific temperature) and extract a charging graph composed of the extracted critical charging rates, as shown in the graph 300.

[0048] Refer again Figure 1 The calculation unit 120 can calculate the degree of degradation of the target battery at a specified temperature. According to an embodiment, the calculation unit 120 can perform a specified number of charges on the target battery at a specified temperature based on the critical charging conditions extracted by the extraction unit 110. The calculation unit 120 can calculate the degree of degradation of the target battery after charging. For example, the calculation unit 120 can calculate the state of health (SOH) of the charged target battery. The calculation unit 120 can calculate the degree of degradation of the target battery by comparing the calculated SOH with the initial SOH of the target battery. Specifically, the calculation unit 120 can calculate the SOH decay rate based on the comparison result of the target battery.

[0049] According to an embodiment, the calculation unit 120 can perform a specified number of charges on the first target battery at a specified temperature based on the first critical charging condition extracted by the extraction unit 110, and then calculate the first degree of degradation of the first target battery. Here, the specified temperature may be the temperature corresponding to the first critical charging condition.

[0050] According to an embodiment, the diagnostic unit 130 can diagnose a first critical charging condition based on a first degree of degradation calculated by the calculation unit 120. For example, when the first degree of degradation is equal to or greater than a threshold, the diagnostic unit 130 can diagnose the first critical charging condition as an impossible condition for preventing lithium deposition. As another example, when the first degree of degradation is less than a threshold, the diagnostic unit 130 can diagnose the first critical charging condition as a possible condition for preventing lithium deposition.

[0051] According to an embodiment, the charging condition setting device 100 can determine whether to reset the critical charging condition based on the diagnostic results of the diagnostic unit 130.

[0052] For example, when the diagnostic unit 130 diagnoses the first critical charging condition as a possible condition for preventing lithium deposition, the charging condition setting device 100 can set the first critical charging condition as the final charging condition without resetting the critical charging condition.

[0053] For example, when the diagnostic unit 130 diagnoses the first critical charging condition as an impossible condition for preventing lithium deposition, the charging condition setting device 100 can reset the critical charging condition. In this case, the charging condition setting device 100 can use the extraction unit 110, the calculation unit 120, and the diagnostic unit 130 to perform extraction and diagnostic operations for a second critical charging condition that is different from the first critical charging condition.

[0054] According to an embodiment, when the diagnostic unit 130 diagnoses the first critical charging condition as an impossible condition for preventing lithium deposition, the extraction unit 110 can extract a second critical charging condition based on a charging rate lower than the first critical charging condition. For example, the extraction unit 110 can extract a second critical charging condition in which the critical charging rate for each SOC is lower than the first critical charging condition by a specified value (e.g., 0.1C).

[0055] According to an embodiment, the calculation unit 120 can perform a specified number of charges on the second target battery at a specified temperature based on a second critical charging condition, and then calculate a second degree of degradation of the second target battery. Here, the specified temperature can be a temperature corresponding to the second critical charging condition. Furthermore, the calculation unit 120 can output the second degree of degradation using the same method as the first degree of degradation output method.

[0056] According to an embodiment, the diagnostic unit 130 can diagnose a second critical charging condition based on a second degree of degradation calculated by the calculation unit 120. For example, when the second degree of degradation is equal to or greater than a threshold, the diagnostic unit 130 can diagnose the second critical charging condition as an impossible condition for preventing lithium deposition. As another example, when the second degree of degradation is less than a threshold, the diagnostic unit 130 can diagnose the second critical charging condition as a possible condition for preventing lithium deposition.

[0057] The extraction unit 110, calculation unit 120, and diagnostic unit 130 described above can be implemented as a single processor or a separate processor. Here, the processor can execute software to allow the processor to control at least one other component (e.g., hardware or software component) of the charging condition setting device 100 and perform various data processing or calculations.

[0058] Figure 4 This is a flowchart of the operation of the charging condition setting device according to an embodiment. Figure 4 It can be Figure 1 The description of the operation of the charging condition setting device 100 is provided, and it can be used... Figure 1 The configuration in the document is used to describe this.

[0059] Figure 4 The embodiments shown are merely one example, and the order of steps according to various embodiments of the present invention may differ. Figure 4 The order shown can be omitted. Figure 4 Some of the steps shown can be rearranged in order, or steps can be combined.

[0060] refer to Figure 4 In operation 405, the charging condition setting device 100 can extract a first critical charging condition to prevent lithium deposition in the battery at a specified temperature.

[0061] According to an embodiment, the charging condition setting device 100 can perform multiple charging operations on the battery at a specified temperature based on multiple charging rates for a specified time to obtain negative electrode charging depth data.

[0062] According to an embodiment, the charging condition setting device 100 can extract a first critical charging condition based on the acquired negative electrode charging depth data. For example, the charging condition setting device 100 can extract a critical charging rate based on the acquired negative electrode charging depth data, where the difference between the time elapsed during charging and the critical charging depth becomes less than or equal to a specified value. The charging condition setting device 100 can extract the critical charging rate for each state of charge (SOC) and extract a first critical charging condition composed of the extracted critical charging rates.

[0063] In operation 410, the charging condition setting device 100 can perform a specified amount of charging on the first target battery at a specified temperature based on the first critical charging condition extracted in operation 410. Here, the specified temperature may be the temperature corresponding to the first critical charging condition.

[0064] In operation 415, the charging condition setting device 100 can calculate a first degree of degradation of the first target battery. According to an embodiment, the charging condition setting device 100 can calculate the state of health (SOH) of the first target battery. The charging condition setting device 100 can calculate the degree of degradation of the first target battery by comparing the calculated SOH with the initial SOH of the first target battery. Specifically, the charging condition setting device 100 can calculate the SOH decay rate based on the comparison result of the first target battery.

[0065] In operation 420, the charging condition setting device 100 can diagnose a first critical charging condition based on a first degree of degradation calculated in operation 415. For example, when the first degree of degradation is equal to or greater than a threshold, the charging condition setting device 100 can diagnose the first critical charging condition as an impossible condition for preventing lithium deposition. As another example, when the first degree of degradation is less than a threshold, the charging condition setting device 100 can diagnose the first critical charging condition as a possible condition for preventing lithium deposition.

[0066] Figure 5 This is a flowchart of the operation of the charging condition setting device according to an embodiment. Figure 5 It can be Figure 1 The description of the operation of the charging condition setting device 100 is provided, and it can be used... Figure 1 The configuration in the document is used to describe this.

[0067] Figure 5 The embodiments shown are merely one example, and the order of steps according to various embodiments of the present invention may differ. Figure 5 The order shown can be omitted. Figure 5 Some of the steps shown can be rearranged in order, or steps can be combined.

[0068] refer to Figure 5 In operation 505, the charging condition setting device 100 can recognize that... Figure 4 In operation 415, the first degree of degradation of the first target battery is calculated to be equal to or greater than the threshold.

[0069] When the first degree of degradation is identified as less than a threshold ("No") in operation 505, the charging condition setting device 100 can diagnose the first critical charging condition as a possible condition for preventing lithium deposition in operation 510.

[0070] When the first degree of degradation is identified as equal to or greater than the threshold ("Yes") in operation 505, the charging condition setting device 100 can diagnose the first critical charging condition as an impossible condition for preventing lithium deposition in operation 515.

[0071] In operation 520, the charging condition setting device 100 may extract a second critical charging condition based on a charging rate lower than a first critical charging condition. For example, the charging condition setting device 100 may extract a second critical charging condition in which the critical charging rate of each SOC is lower than the first critical charging condition by a specified value (e.g., 0.1C).

[0072] In operation 525, the charging condition setting device 100 can perform a specified number of charges on the second target battery at a specified temperature based on a second critical charging condition. Here, the specified temperature can be a temperature corresponding to the second critical charging condition.

[0073] In operation 530, the charging condition setting device 100 can calculate the second degree of degradation of the second target battery. Here, the charging condition setting device 100 can be based on... Figure 4 The second degree of degradation is calculated using the same method as operation 415.

[0074] In operation 535, the charging condition setting device 100 can diagnose a second critical charging condition based on a second degree of degradation calculated in operation 530. For example, when the second degree of degradation is equal to or greater than a threshold, the charging condition setting device 100 can diagnose the second critical charging condition as an impossible condition for preventing lithium deposition. As another example, when the second degree of degradation is less than a threshold, the charging condition setting device 100 can diagnose the second critical charging condition as a possible condition for preventing lithium deposition.

[0075] Unless otherwise stated, the terms such as “comprising,” “including,” or “having” above mean that the corresponding component may be present, and therefore should be understood as potentially including other components rather than excluding them. Unless otherwise defined, all terms including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments disclosed herein pertain. Commonly used terms (such as those defined in dictionaries) should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and will not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

Claims

1. A charging condition setting device, comprising: An extraction unit configured to extract a first critical charging condition for preventing lithium deposition in the battery at a specified temperature; A calculation unit configured to perform a specified number of charges on a first target battery at the specified temperature based on the first critical charging condition, and then calculate a first degree of degradation of the first target battery; as well as A diagnostic unit configured to diagnose the first critical charging condition based on a calculated first degree of degradation.

2. The charging condition setting device according to claim 1, wherein The extraction unit: At the specified temperature, the battery is charged multiple times at multiple charging rates C for a specified time to obtain negative electrode charge depth data. The first critical charging condition is extracted based on the acquired negative electrode charging depth data.

3. The charging condition setting device according to claim 2, wherein, The extraction unit extracts the critical charging rate based on the acquired negative electrode charging depth data, where the difference between the time elapsed during charging and the critical charging depth becomes less than or equal to a specified value.

4. The charging condition setting device according to claim 1, wherein, The first critical charging condition includes a charging graph indicating the charging conditions based on the state of charge (SOC) of the battery at the specified temperature.

5. The charging condition setting device according to claim 1, wherein, The computing unit: Based on the first critical charging condition, the first target battery is charged a specified number of times at the specified temperature, and then the state of health (SOH) of the first target battery is calculated. The calculated SOH is compared with the initial SOH of the first target battery to calculate the first degree of degradation of the first target battery.

6. The charging condition setting device according to claim 1, wherein, The diagnostic unit: When the calculated first degree of degradation is equal to or greater than the threshold, the first critical charging condition is diagnosed as an impossible condition for preventing lithium deposition. When the calculated first degree of degradation is less than the threshold, the first critical charging condition is diagnosed as a possible condition for preventing lithium deposition.

7. The charging condition setting device according to claim 6, wherein, When the diagnostic unit diagnoses the first critical charging condition as an impossible condition for preventing lithium deposition, The extraction unit extracts the second critical charging condition based on a charging rate lower than the first critical charging condition. The calculation unit performs a specified number of charges on the second target battery at the specified temperature based on the second critical charging condition, and then calculates the second degree of degradation of the second target battery, and The diagnostic unit diagnoses the second critical charging condition based on the calculated second degree of degradation.

8. An operating method for a charging condition setting device, comprising: Extract the first critical charging condition of the battery at a specified temperature; Based on the first critical charging condition, a specified number of charges are performed on the first target battery at the specified temperature, and then the first degree of degradation of the first target battery is calculated. as well as The first critical charging condition is diagnosed based on the calculated first degree of degradation.

9. The operating method according to claim 8, wherein, Extracting the first critical charging condition includes: At the specified temperature, the battery is charged multiple times at multiple charging rates C for a specified time to obtain negative electrode charge depth data; and The first critical charging condition is extracted based on the acquired negative electrode charging depth data.

10. The operating method according to claim 9, wherein, Extracting the first critical charging condition includes: extracting the critical charging rate based on the acquired negative electrode charging depth data, where the difference between the time elapsed during the charging period and the critical charging depth becomes less than or equal to a specified value.

11. The operating method according to claim 8, wherein, The first critical charging condition includes a charging graph indicating the charging conditions based on the state of charge (SOC) of the battery at the specified temperature.

12. The method according to claim 8, wherein, Calculating the first degree of degradation of the first target battery includes: Based on the first critical charging condition, the first target battery is charged a specified number of times at the specified temperature, and then the state of health (SOH) of the first target battery is calculated; and The calculated SOH is compared with the initial SOH of the first target battery to calculate the first degree of degradation of the first target battery.

13. The operating method according to claim 8, wherein, Diagnosing the first critical charging condition includes: When the calculated first degree of degradation is equal to or greater than the threshold, the first critical charging condition is diagnosed as an impossible condition for preventing lithium deposition; and When the calculated first degree of degradation is less than the threshold, the first critical charging condition is diagnosed as a possible condition for preventing lithium deposition.

14. The operating method according to claim 13, further comprising: When the first critical charging condition is diagnosed as an impossible condition for preventing lithium deposition. The second critical charging condition is extracted based on the charging rate below the first critical charging condition. Based on the second critical charging condition, a specified number of charges are performed on the second target battery at the specified temperature, and then the second degree of degradation of the second target battery is calculated; as well as The second critical charging condition is diagnosed based on the calculated second degree of degradation.

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