Charging protocol inspection device and operation method thereof

Abstract

A charging protocol inspection device according to one embodiment disclosed in this document includes an information acquisition unit that acquires information regarding a charging protocol of a battery cell, an open circuit voltage (OCV) value corresponding to the SOC of the battery cell, and a reference internal resistance value of the battery cell, a resistance calculation unit that calculates the internal resistance value of the battery cell during charging based on the information regarding the charging protocol and the open circuit voltage value corresponding to the SOC of the battery cell, and a comparison unit that compares the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging.

Description

[Technical Field]

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2021-0176328, filed December 10, 2021, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference. SUMMARY OF THE INVENTION The embodiments disclosed herein relate to a charging protocol checking apparatus and method of operation. [Background technology]

[0002] In recent years, research and development into secondary batteries has been actively pursued. Here, the term "secondary battery" refers to a rechargeable battery, encompassing both conventional Ni / Cd batteries, Ni / MH batteries, and more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd batteries, Ni / MH batteries, and other batteries. Furthermore, because lithium-ion batteries can be manufactured to be compact and lightweight, they are used as power sources for mobile devices. Recently, their use has expanded to include electric vehicles, drawing attention as a next-generation energy storage medium.

[0003] Recently, batteries have been equipped with a fast charge function. Fast charge can affect the fast charge life of a battery depending on how the charging protocol is set. Therefore, a method for setting the charging protocol is required. One method involves fabricating a mono-cell three-electrode battery, checking the charge depth, and deriving a charging protocol for a large cell based on the confirmed charge depth of the mono-cell. However, converting from a mono cell to a large cell can be problematic because there are many factors that cannot be taken into account, such as the resistance of the large cell and heat generated during fast charge. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the embodiments disclosed herein is to provide a charging protocol inspection device and an operating method thereof that can calculate the internal resistance value of a battery cell and determine the compatibility of a charging protocol based on the calculated internal resistance value.

[0005] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0006] A charging protocol inspection device according to one embodiment disclosed in this document includes an information acquisition unit that acquires information about a charging protocol of a battery cell, an open circuit voltage (OCV) value corresponding to the SOC of the battery cell, and a reference internal resistance value of the battery cell; a resistance calculation unit that calculates the internal resistance value of the battery cell during charging based on the information about the charging protocol and the open circuit voltage value corresponding to the SOC of the battery cell; and a comparison unit that compares the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging.

[0007] In an embodiment, the information about the charging protocol of the battery cell may include a voltage value according to the SOC of the battery cell when the battery cell is charged according to the charging protocol.

[0008] In one embodiment, the resistance calculation unit calculates an overvoltage value according to the SOC of the battery cell, which is the difference between a voltage value according to the SOC of the battery cell and an open circuit voltage value according to the SOC of the battery cell, and can calculate the internal resistance value of the battery cell during charging by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell.

[0009] In an embodiment, the resistance calculation unit may calculate an internal resistance value of the battery cell during charging for each of the charging protocols. In an embodiment, the comparison unit may compare a reference internal resistance value of the battery cell with an internal resistance value of the battery cell during charging for each SOC.

[0010] In an embodiment, the comparison unit may compare a reference internal resistance value of the battery cell with an internal resistance value of the battery cell during charging for each charging protocol. In one embodiment, the charging protocol may further include a determination unit that determines a similarity between the battery cell and a reference charging protocol based on a comparison result for each charging protocol.

[0011] In an embodiment, the comparison unit may compare a reference internal resistance value of the battery cell with an internal resistance value of the battery cell during charging in a specific section of the SOC.

[0012] In one embodiment, the charging protocol can be set to information about a current that charges the battery in steps depending on the time required to charge the battery.

[0013] In one embodiment, the charging protocol can be set to a protocol for fast charging. In one embodiment, the charging protocol may be set for each fast charging time.

[0014] An operating method of a charging protocol inspection device according to an embodiment disclosed in this document includes the steps of: acquiring information about a charging protocol of a battery cell, an open circuit voltage (OCV) value according to the SOC of the battery cell, and a reference internal resistance value of the battery cell; calculating an internal resistance value of the battery cell during charging based on the information about the charging protocol and the open circuit voltage value according to the SOC of the battery cell; and comparing the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging.

[0015] In an embodiment, the information about the charging protocol of the battery cell may include a voltage value according to the SOC of the battery cell when the battery cell is charged according to the charging protocol.

[0016] In one embodiment, the step of calculating the internal resistance value of the battery cell during charging based on the information about the charging protocol and the open circuit voltage value corresponding to the SOC of the battery cell can include the steps of: calculating an overvoltage value corresponding to the SOC of the battery cell, which is the difference between the voltage value corresponding to the SOC of the battery cell and the open circuit voltage value corresponding to the SOC of the battery cell; and calculating the internal resistance value of the battery cell during charging by dividing the calculated overvoltage value corresponding to the SOC of the battery cell by the current flowing through the battery cell. [Effects of the Invention]

[0017] The charging protocol inspection device and its operating method according to one embodiment disclosed in this document can calculate the internal resistance value of a battery cell for each charging protocol, and can determine whether the charging protocol is suitable based on the calculated internal resistance value.

[0018] The charging protocol inspection device and its operating method according to one embodiment disclosed herein can be used as a guide for the charging protocol because the change in internal resistance value is analyzed as being caused by the negative electrode, and therefore the suitability of the charging protocol can be determined based on the internal resistance value.

[0019] The charging protocol inspection device and its operating method according to one embodiment disclosed in this document can determine the suitability of a charging protocol for a large cell itself without fabricating a mono-cell type three-electrode. In addition, this document may provide a variety of other benefits that may be perceived directly or indirectly. [Brief explanation of the drawings]

[0020] [Figure 1]FIG. 1 is a block diagram illustrating an embodiment of a charging protocol checking device disclosed herein. [Figure 2] FIG. 1 illustrates an example charging protocol according to one embodiment disclosed herein. [Figure 3] FIG. 1 illustrates the change in internal resistance value according to charging protocols according to one embodiment disclosed herein. [Figure 4] 1 is a flowchart illustrating a method of operation of a charging protocol checking device according to one embodiment disclosed herein. [Figure 5] 1 is a flowchart illustrating a method of operation of a charging protocol checking device according to an embodiment disclosed herein. [Figure 6] FIG. 1 is a block diagram illustrating a hardware configuration of a computing system for performing an operation method of a charging protocol checking device according to an embodiment disclosed herein. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the embodiments disclosed herein will be described in detail with reference to the accompanying drawings. When designating components in each drawing, it should be noted that the same components are designated by the same reference numerals whenever possible even when they appear in other drawings. Furthermore, when describing the embodiments disclosed herein, if a detailed description of related known structures or functions is deemed to hinder understanding of the embodiments disclosed herein, such detailed description will be omitted.

[0022] In describing components of the embodiments disclosed herein, terms such as first, second, A, B, (a), and (b) may be used. Such terms are merely used to distinguish a component from other components and do not limit the nature, order, or sequence of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed herein pertain. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0023] FIG. 1 is a block diagram illustrating a charging protocol checking device according to one embodiment disclosed herein. 1 , a charging protocol checking device 100 according to an embodiment disclosed herein may include an information acquiring unit 110, a resistance calculating unit 120, and a comparing unit 130. In an embodiment, the charging protocol checking device 100 may further include a determining unit 140.

[0024] In one embodiment, the charging protocol may be set to information regarding a current for charging the battery in steps according to the time required to charge the battery. For example, the charging protocol may be set to a protocol for fast charging. In another example, the charging protocol may be set according to the fast charging time. Depending on the embodiment, the fast charging time may be set to, for example, 21 minutes or 30 minutes, but is not limited thereto.

[0025] The information acquisition unit 110 can acquire information related to the charging protocol of the battery cell. For example, the information related to the charging protocol of the battery cell can include a voltage value according to the SOC of the battery cell when the battery cell is charged according to the charging protocol.

[0026] The information acquiring unit 110 can acquire an open circuit voltage value according to the SOC of the battery cell. For example, the information acquiring unit 110 can acquire an OCV value for each SOC.

[0027] The information acquiring unit 110 may acquire a reference internal resistance value of the battery cell. For example, the information acquiring unit 110 may acquire an internal resistance value when the battery cell is charged at a reference C-rate. As another example, the C-rate may refer to a current level at which the battery cell is charged step by step. As another example, the reference C-rate may be 0.33C. Depending on the embodiment, the information acquiring unit 110 may transmit the acquired information to the resistance calculating unit 120 or the comparing unit 130 .

[0028] The resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging based on information related to the charging protocol and the open circuit voltage value corresponding to the SOC of the battery cell. For example, the resistance calculation unit 120 can calculate an overvoltage value corresponding to the SOC of the battery cell, which is the difference between the voltage value corresponding to the SOC of the battery cell and the open circuit voltage value corresponding to the SOC of the battery cell. In this case, the resistance calculation unit 120 can calculate the overvoltage value for each SOC of the battery cell.

[0029] The resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell. For example, the resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging for each SOC of the battery cell. As another example, the current flowing through the battery cell may be acquired from the information acquisition unit 110 or from a battery pack including the battery cell.

[0030] According to an embodiment, the resistance calculation unit 120 may calculate the internal resistance value of the battery cell during charging for each charging protocol. For example, the resistance calculation unit 120 may calculate the internal resistance value of the battery cell during charging for each SOC corresponding to each charging protocol.

[0031] The comparison unit 130 can compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell when it is being charged. For example, the comparison unit 130 can compare the reference internal resistance value of the battery cell acquired from the information acquisition unit 110 with the internal resistance value of the battery cell when it is being charged, calculated by the resistance calculation unit 120.

[0032] In one embodiment, the comparison unit 130 may compare the reference internal resistance of the battery cell with the internal resistance of the battery cell when being charged for each SOC. For example, the comparison unit 130 may compare the reference internal resistance of the battery cell with the internal resistance of the battery cell when being charged in a specific SOC range. As another example, the comparison unit 130 may calculate the difference between the reference internal resistance of the battery cell and the internal resistance of the battery cell when being charged for each charging protocol. As yet another example, the comparison unit 130 may sum up the absolute values ​​of the differences between the reference internal resistance of the battery cell and the internal resistance of the battery cell when being charged for each charging protocol. As yet another example, the comparison unit 130 may sample and compare the difference between the reference internal resistance of the battery cell and the internal resistance of the battery cell when being charged at a specific SOC.

[0033] In one embodiment, the comparing unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging for each charging protocol. For example, the comparing unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging for each charging protocol based on a comparison result for each SOC.

[0034] The charging protocol checking device 100 according to an embodiment disclosed herein may further include a determination unit 140. The determination unit 140 may determine the similarity of the battery cell with a reference charging protocol based on the comparison result of each charging protocol compared by the comparison unit 130. For example, the reference charging protocol may be a protocol for determining a reference internal resistance value of the battery cell. As another example, the reference charging protocol may be a protocol for charging the battery cell at a reference C-rate. As another example, the C-rate may refer to the current level at which the battery cell is charged step by step. As another example, the reference C-rate may be 0.33 C.

[0035] As a result of the comparison, the determination unit 140 may determine a charging protocol having an internal resistance value more similar to the internal resistance value of the reference charging protocol. For example, the determination unit 140 may calculate a similarity between the internal resistance value of each charging protocol and the reference charging protocol, and determine a charging protocol having an internal resistance value more similar to the reference charging protocol based on the calculated similarity. As another example, the similarity may be calculated based on the sum of absolute values ​​of differences between the reference internal resistance value and the internal resistance value calculated by the resistance calculation unit 120. As another example, the similarity may be calculated based on the average value, mean square deviation, or standard deviation of the differences between the reference internal resistance value and the internal resistance value calculated by the resistance calculation unit 120. According to an embodiment, the determination unit 140 may determine that a charging protocol calculated to have a high similarity has a longer lifespan than other charging protocols. In this case, the lifespan may be the number of cycles that a battery cell can be charged using the charging protocol.

[0036] In one embodiment, at least some of the information acquisition unit 110, the resistance calculation unit 120, the comparison unit 130, and the determination unit 140 may be implemented as a single module. For example, an MCU may perform the functions of the information acquisition unit 110, the resistance calculation unit 120, the comparison unit 130, and the determination unit 140. However, without being limited thereto, the functions of the information acquisition unit 110, the resistance calculation unit 120, the comparison unit 130, and the determination unit 140 may each be performed as a separate module.

[0037] A charging protocol inspection device according to an embodiment disclosed herein can calculate the internal resistance value of a battery cell for each charging protocol, and can determine whether the charging protocol is suitable based on the calculated internal resistance value.

[0038] The charging protocol inspection device according to one embodiment disclosed herein can be used as a guide for the charging protocol because it analyzes changes in internal resistance as being caused by the negative electrode, and therefore can determine the suitability of the charging protocol based on the internal resistance.

[0039] The charging protocol inspection device according to one embodiment disclosed in this document can determine the suitability of a charging protocol for a large cell itself, without fabricating a three-electrode mono-cell type.

[0040] FIG. 2 is a diagram illustrating an example charging protocol according to one embodiment disclosed herein. 2, it can be seen that the C-rate of the 25.4 minute charging protocol (10) is greater than the C-rate of the 33 minute charging protocol (20). Because charging at a higher C-rate is advantageous for faster charging of battery cells, the 25.4 minute charging protocol (10) can be charged at a higher C-rate than the 33 minute charging protocol (20).

[0041] The 25.4 minute charging protocol (10) can charge at a 3 C-rate up to a depth of charge (DOC) of 30, at a 2.75 C-rate up to a DOC of 35, and at a 2.5 C-rate up to a DOC of 40. The reason the C-rate varies depending on the DOC is that charging at a high C-rate can cause the precipitation of ions contained in the battery cell to proceed quickly, so the higher the DOC, the lower the C-rate must be.

[0042] In the 25.4 minute charging protocol (10) and the 33 minute charging protocol (20), the change in C-rate according to the depth of charge can be referred to as a step. That is, the charging protocol can be set to information (e.g., C-rate) about the current that charges the battery cell in steps according to the time required to charge the battery cell.

[0043] FIG. 3 is a diagram illustrating changes in internal resistance according to charging protocols according to an embodiment disclosed herein. Referring to FIG. 3, which is a graph showing the change in internal resistance value according to the SOC, it is possible to see the internal resistance value when charging at a 0.33 C-rate (reference internal resistance value, 30), the internal resistance value when charging with a 25.4 minute charging protocol (40), and the internal resistance value when charging with a 33 minute charging protocol (50).

[0044] The charging protocol inspection device 100 can determine the similarity between the internal resistance value (40) when charging using a 25.4 minute charging protocol and the internal resistance value (50) when charging using a 33 minute charging protocol, and the reference internal resistance value (30). For example, the charging protocol inspection device 100 can determine the similarity between the internal resistance value (40) when charging using a 25.4 minute charging protocol and the internal resistance value (50) when charging using a 33 minute charging protocol, and the reference internal resistance value (30) in a specific SOC range. In one embodiment, the specific SOC range may be from SOC 60 to SOC 80, and the charging protocol inspection device 100 can determine that the similarity between the internal resistance value (50) when charging using a 33 minute charging protocol and the reference internal resistance value (30) is greater than the similarity between the internal resistance value (40) when charging using a 25.4 minute charging protocol and the reference internal resistance value (30). In this case, the charging protocol inspection device 100 can determine that charging the battery with a 33 minute charging protocol is more preferable than charging the battery with a 25.4 minute charging protocol, and can determine that the battery's cycle life will be even longer when charging the battery with the 33 minute charging protocol.

[0045] FIG. 4 is a flowchart illustrating a method of operation of a charging protocol checking device according to one embodiment disclosed herein. Referring to FIG. 4, the operating method of the charging protocol inspection device 100 according to one embodiment disclosed in this document includes the steps of: acquiring information about the charging protocol of the battery cell, an open circuit voltage (OCV) value according to the SOC of the battery cell, and a reference internal resistance value of the battery cell (S110); calculating the internal resistance value of the battery cell during charging based on the information about the charging protocol and the open circuit voltage value according to the SOC of the battery cell (S120); and comparing the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging (S130).

[0046] In the step of acquiring information about the charging protocol of the battery cell, an open circuit voltage (OCV) value according to the SOC of the battery cell, and a reference internal resistance value of the battery cell (S110), the information acquiring unit 110 may acquire the information about the charging protocol of the battery cell, the open circuit voltage (OCV) value according to the SOC of the battery cell, and the reference internal resistance value of the battery cell. For example, the information about the charging protocol of the battery cell may include a voltage value according to the SOC of the battery cell when the battery cell is charged according to the charging protocol. As another example, the information acquiring unit 110 may acquire an OCV value for each SOC of the battery cell. As another example, the reference internal resistance value of the battery cell may be an internal resistance value when the battery cell is charged at a reference C-rate. According to an embodiment, the C-rate may refer to the level of current at which the battery cell is charged step by step. For example, the reference C-rate may be 0.33 C.

[0047] In the step (S120) of calculating the internal resistance value of the battery cell during charging based on the information related to the charging protocol and the open circuit voltage value corresponding to the SOC of the battery cell, the resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging based on the information related to the charging protocol and the open circuit voltage value (OCV) corresponding to the SOC of the battery cell. For example, the resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging for each SOC of the battery cell.

[0048] In the step of comparing the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging (S130), the comparison unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging calculated by the resistance calculation unit 120. For example, the comparison unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging for each SOC of the battery cell. As another example, the comparison unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging for each charging protocol. As yet another example, the comparison unit 130 may compare the reference internal resistance value of the battery cell with the internal resistance value of the battery cell during charging in a specific SOC range.

[0049] FIG. 5 is a flowchart illustrating a method of operation of a charging protocol checking device according to an embodiment disclosed herein. 5, the method of operating the charging protocol inspection device 100 according to an embodiment disclosed herein may include the steps of: calculating an overvoltage value according to the SOC of the battery cell, which is the difference between a voltage value according to the SOC of the battery cell and an open-circuit voltage value according to the SOC of the battery cell (S210); and calculating an internal resistance value of the battery cell during charging by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell (S220). In one embodiment, steps S210 and S220 may be included in step S120 of FIG. 4.

[0050] In the step (S210) of calculating an overvoltage value according to the SOC of the battery cell, which is the difference between a voltage value according to the SOC of the battery cell and an open circuit voltage value according to the SOC of the battery cell, the resistance calculation unit 120 can calculate an overvoltage value according to the SOC of the battery cell, which is the difference between a voltage value according to the SOC of the battery cell and an open circuit voltage value according to the SOC of the battery cell.

[0051] In the step (S220) of calculating the internal resistance value of the battery cell during charging by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell, the resistance calculation unit 120 can calculate the internal resistance value of the battery cell during charging by dividing the overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell. For example, the current flowing through the battery cell may be the current flowing through the battery cell according to the SOC when the battery cell is charged using the charging protocol.

[0052] FIG. 6 is a block diagram illustrating a hardware configuration of a computing system for performing an operation method of a charging protocol checking device according to an embodiment disclosed herein.

[0053] Referring to FIG. 6, a computing system 1000 according to one embodiment disclosed herein may include an MCU 1010, a memory 1020, an input / output I / F 1030, and a communication I / F 1040.

[0054] The MCU 1010 may be a processor that executes various programs stored in the memory 1020 (e.g., a program for collecting the voltage or current of the battery pack, a program for controlling a relay included in the battery pack, a program for calculating the internal resistance, etc.), processes various information including the internal resistance of the battery and comparison information between the internal resistance of the battery and a reference internal resistance through such programs, and performs the functions of the charging protocol inspection device shown in Figure 1 described above.

[0055] The memory 1020 can store various programs related to collecting and diagnosing battery log information, and various information such as the battery current, voltage, internal resistance, OCV value, and charging protocol information.

[0056] A plurality of such memories 1020 may be provided as necessary. The memories 1020 may be volatile memories or nonvolatile memories. As the volatile memories 1020, RAM, DRAM, SRAM, etc. may be used. As the nonvolatile memories 1020, ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. may be used. The examples of the memories 1020 listed above are merely illustrative and are not limited to these examples.

[0057] The input / output I / F 1030 can provide an interface that connects input devices (not shown) such as a keyboard, mouse, or touch panel, and output devices such as a display (not shown), to the MCU 1010, enabling data to be sent and received.

[0058] The communication I / F 1040 is configured to be able to transmit and receive various data to and from a server and may be any device capable of supporting wired or wireless communication. For example, the battery management device may transmit and receive information such as a control program for a relay included in a battery pack, or information such as the current, current, or internal resistance value of various battery packs from a separately provided external server via the communication I / F 1040.

[0059] In this way, the computer program of one embodiment disclosed in this document may be recorded in memory 1020 and processed by MCU 1010 to be realized, for example, as a module that performs each function shown in Figure 1.

[0060] The above description is merely an illustrative example of the technical ideas disclosed in this document, and various modifications and variations may be made by a person having ordinary skill in the art to which the embodiments disclosed in this document pertain without departing from the essential characteristics of the embodiments disclosed in this document.

[0061] Therefore, the embodiments disclosed in this document are intended to illustrate, not limit, the technical ideas disclosed in this document, and such embodiments do not limit the scope of the technical ideas disclosed in this document. The scope of protection of the technical ideas disclosed in this document should be interpreted according to the claims set forth below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of rights of this document.

Claims

1. an information acquisition unit that acquires information about a charging protocol of a battery cell, an open circuit voltage (OCV) value according to an SOC of the battery cell, and a reference internal resistance value of the battery cell; a resistance calculation unit that calculates an internal resistance value of the battery cell during charging based on information about the charging protocol and an open circuit voltage value according to an SOC of the battery cell; a comparison unit that compares a reference internal resistance value of the battery cell with an internal resistance value of the battery cell during charging; Including, The information regarding the charging protocol of the battery cell includes: a voltage value corresponding to each SOC of the battery cell when the battery cell is charged according to the charging protocol; The comparison unit compares a reference internal resistance value of the battery cell, which is an internal resistance value when the battery cell is charged at a reference C-rate, with an internal resistance value of the battery cell during charging, which is an internal resistance value when the battery cell is charged at a C-rate different from the reference C-rate.

2. A charging protocol inspection device as described in claim 1, wherein the C-rate different from the standard C-rate is a C-rate higher than the standard C-rate.

3. The resistance calculation unit calculating an overvoltage value according to the SOC of the battery cell, which is a difference between a voltage value according to the SOC of the battery cell and an open circuit voltage value according to the SOC of the battery cell; 2. The charging protocol inspection device according to claim 1, wherein the internal resistance value of the battery cell during charging is calculated by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell.

4. The resistance calculation unit The charging protocol inspection device according to claim 1 , further comprising: a charging protocol checker configured to calculate an internal resistance value of the battery cell during charging for each of the charging protocols.

5. The comparison unit The charging protocol inspection device according to claim 1 , wherein the reference internal resistance value of the battery cell is compared with the internal resistance value of the battery cell during charging for each SOC.

6. The comparison unit The charging protocol inspection device according to claim 1 , wherein the reference internal resistance value of the battery cell is compared with the internal resistance value of the battery cell during charging for each charging protocol.

7. The charging protocol checking device according to claim 6 , further comprising a determination unit that determines a similarity between the battery cell and a reference charging protocol based on the comparison result for each charging protocol.

8. The comparison unit The charging protocol inspection device according to claim 1 , wherein a reference internal resistance value of the battery cell is compared with an internal resistance value of the battery cell during charging in a specific section of the SOC.

9. The charging protocol comprises:

5. The charging protocol checking device according to claim 1, wherein information relating to a current for charging the battery cell in steps is set according to a time required to charge the battery cell.

10. The charging protocol comprises: The charging protocol checking device according to claim 1 , which is set to a protocol for rapid charging.

11. The charging protocol comprises: The charging protocol checking device according to claim 1 , wherein the charging protocol checking device is set for each time period for fast charging.

12. Obtaining information about a charging protocol of a battery cell, an open circuit voltage (OCV) value according to an SOC of the battery cell, and a reference internal resistance value of the battery cell; calculating an internal resistance value of the battery cell during charging based on information about the charging protocol and an open circuit voltage value according to an SOC of the battery cell; comparing a reference internal resistance value of the battery cell with an internal resistance value of the battery cell during charging; Including, The information regarding the charging protocol of the battery cell includes: a voltage value corresponding to each SOC of the battery cell when the battery cell is charged according to the charging protocol; The comparing step includes a step of comparing a reference internal resistance value of the battery cell, which is an internal resistance value when the battery cell is charged at a reference C-rate, with an internal resistance value of the battery cell during charging, which is an internal resistance value when the battery cell is charged at a C-rate different from the reference C-rate.

13. The method for operating a charging protocol inspection device described in claim 12, wherein the C-rate different from the reference C-rate is a C-rate higher than the reference C-rate.

14. calculating an internal resistance value of the battery cell during charging based on information about the charging protocol and an open circuit voltage value according to an SOC of the battery cell, calculating an overvoltage value according to the SOC of the battery cell, which is a difference between a voltage value according to the SOC of the battery cell and an open circuit voltage value according to the SOC of the battery cell; 14. The method for operating a charging protocol inspection device according to claim 12 or 13, further comprising: a step of calculating an internal resistance value of the battery cell during charging by dividing the calculated overvoltage value according to the SOC of the battery cell by the current flowing through the battery cell.

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