Battery charge depth calculation device and operation method thereof

Abstract

A battery charge depth calculation device according to one embodiment disclosed in this document includes an information acquisition unit that acquires information on an open circuit voltage (OCV) value corresponding to a state of charge (SOC) of a battery cell and a voltage value corresponding to the SOC when the battery cell is being charged, a resistance calculation unit that calculates an internal resistance value corresponding to the SOC when the battery cell is being charged, based on information on the voltage value corresponding to the SOC when the battery cell is being charged and the open circuit voltage value corresponding to the SOC of the battery cell, and a charge depth calculation unit that calculates a charge depth of a negative electrode of the battery cell based on the internal resistance value.

Description

[Technical field]

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2022-0004355, filed on January 11, 2022, and all contents disclosed in the documents of the Korean patent application are incorporated as part of this specification.

[0002] SUMMARY OF THE DISCLOSURE The embodiments disclosed herein relate to an apparatus for calculating depth of charge of a battery and a method of operation thereof. [Background technology]

[0003] In recent years, research and development into secondary batteries has been actively conducted. Here, secondary batteries are batteries that can be charged and discharged, and include both conventional Ni / Cd batteries, Ni / MH batteries, and the 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 the like. In addition, lithium-ion batteries can be manufactured to be small and lightweight, so they are used as power sources for mobile devices, and in recent years their range of use has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0004] In recent years, batteries have been equipped with a fast charging function. Fast charging can also be related to the fast charging life of the battery depending on the setting method of the charging protocol. Therefore, a method for setting the charging protocol is required, and a method exists for creating a mono-cell type three-electrode to confirm the charge depth, and deriving a charging protocol for a large cell based on the confirmed charge depth of the mono-cell type.

[0005] The existing method of checking the charge depth was to check the inflection point by the differential curve based on the negative electrode charging profile, but different values ​​could be read depending on the line of sight of each person.In addition, even when deriving the negative electrode profile from three electrodes, there is a possibility of change depending on the time, so there is the inconvenience of having to make a reference battery cell as well. Summary of the Invention [Problem to be solved by the invention]

[0006] One objective of the embodiments disclosed herein is to provide a battery charge depth calculation device and an operating method thereof that can calculate an internal resistance value of a battery cell and calculate the charge depth of the battery cell based on the calculated internal resistance value.

[0007] One objective of the embodiments disclosed in this document is to provide a battery charge depth calculation device and an operating method thereof that can calculate the charge depth of a battery cell based on the internal resistance value of a two-electrode full cell without fabricating a three-electrode battery cell.

[0008] 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]

[0009] A battery charge depth calculation device according to one embodiment disclosed in this document includes an information acquisition unit that acquires information on an open circuit voltage (OCV) value corresponding to a state of charge (SOC) of a battery cell and a voltage value corresponding to the SOC when the battery cell is being charged, a resistance calculation unit that calculates an internal resistance value corresponding to the SOC when the battery cell is being charged, based on information on the voltage value corresponding to the SOC when the battery cell is being charged and the open circuit voltage value corresponding to the SOC of the battery cell, and a charge depth calculation unit that calculates a charge depth of a negative electrode of the battery cell based on the internal resistance value.

[0010] In an embodiment, the charge depth calculation unit may calculate a charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value. In one embodiment, the preset value may be 2 ohms.

[0011] In one embodiment, the resistance calculation unit calculates an overvoltage value corresponding to the SOC of the battery cell, which is the difference between a voltage value corresponding to the SOC of the battery cell and an open circuit voltage value corresponding to the SOC of the battery cell, and divides the calculated overvoltage value corresponding to the SOC of the battery cell by a current value flowing through the battery cell to calculate an internal resistance value corresponding to the SOC of the battery cell when charging.

[0012] In an embodiment, the resistance calculation unit may calculate an internal resistance value according to a SOC during charging of the battery cell for each C-rate at which the battery cell is charged. In an embodiment, the charge depth calculation unit may calculate a charge depth of a negative electrode of the battery cell for each of the C-rates.

[0013] In one embodiment, the charge depth of the negative electrode of the battery cell can be used in generating a charging protocol for the battery cell. In one embodiment, the SOC value may be a value at which precipitation of ions contained in the battery cell occurs.

[0014] An operating method of a battery charge depth calculation device according to one embodiment disclosed in this document may include the steps of acquiring information on an open circuit voltage (OCV) value corresponding to a SOC of a battery cell and a voltage value corresponding to the SOC when the battery cell is being charged, calculating an internal resistance value corresponding to the SOC when the battery cell is being charged based on the information on the voltage value corresponding to the SOC when the battery cell is being charged and the open circuit voltage value corresponding to the SOC of the battery cell, and calculating a charge depth of a negative electrode of the battery cell based on the internal resistance value.

[0015] In one embodiment, the step of calculating the charge depth of the negative electrode of the battery cell based on the internal resistance value may calculate the charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value.

[0016] In one embodiment, the step of calculating an internal resistance value corresponding to the SOC of the battery cell when charging based on information regarding a voltage value corresponding to the SOC of the battery cell and an open circuit voltage value corresponding to the SOC of the battery cell may include a step 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 a step of dividing the calculated overvoltage value corresponding to the SOC of the battery cell by a current value flowing through the battery cell to calculate an internal resistance value corresponding to the SOC of the battery cell when charging. Effect of the Invention

[0017] The battery charge depth calculation 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 C-rate, and can calculate the charge depth of the battery cell based on the calculated internal resistance value.

[0018] In one embodiment of the battery charge depth calculation device and its operating method disclosed herein, the change in internal resistance value is analyzed as being caused by the negative electrode, and can be used as a guide to the charge depth, so that the charge depth can be calculated based on the internal resistance value.

[0019] The battery charge depth calculation device and its operating method according to one embodiment disclosed in this document can calculate the charge depth of a large cell itself without fabricating a three-electrode mono-cell type. In addition, this document may provide a variety of other benefits that may be perceived directly or indirectly. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a block diagram showing a configuration of a typical battery pack. [Diagram 2] FIG. 1 is a block diagram illustrating an apparatus for calculating the depth of charge of a battery according to an embodiment disclosed herein. [Diagram 3]FIG. 1 is a diagram showing the internal resistance value of a battery cell for each C-rate according to an embodiment disclosed herein. [Figure 4] FIG. 2 is a diagram illustrating an example of a state of charge calculated by a battery state of charge calculation device according to an embodiment disclosed herein. [Diagram 5] 1 is a flowchart illustrating an operation method of an embodiment of a battery charge depth calculation device disclosed herein. [Figure 6] 1 is a flowchart illustrating a method of operating the battery charge depth calculation device according to an embodiment disclosed herein. [Figure 7] FIG. 2 is a block diagram showing a hardware configuration of a computing system for performing an operation method of a battery charge depth calculation device according to an embodiment disclosed herein. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the embodiments disclosed in this document will be described in detail with reference to the exemplary drawings. When referring to components in each drawing, it should be noted that the same components are referred to by the same reference numerals as much as possible when they are displayed in other drawings. In addition, when describing the embodiments disclosed in this document, if a detailed description of related publicly known configurations or functions is deemed to hinder understanding of the embodiments disclosed in this document, the detailed description will be omitted.

[0022] When describing components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b) and the like may be used. Such terms are merely used to distinguish the components from other components, and do not limit the essence, order, or procedure of the components. In addition, 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 in this document belong. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the contextual meaning of the relevant art, and should not be interpreted in an ideal or overly formal sense unless expressly defined in this application.

[0023] FIG. 1 is a block diagram showing the configuration of a typical battery pack. Referring to FIG. 1, a battery control system including a battery pack 1 according to an embodiment of the present invention and a host controller 2 included in a host system is shown.

[0024] 1, the battery pack 1 includes a chargeable and dischargeable battery module 10 consisting of one or more battery cells, a switching unit 14 connected in series to the (+) terminal side or (-) terminal side of the battery module 10 for controlling the flow of charge and discharge current of the battery module 10, and a battery management system 20 (e.g., RBMS) for monitoring the voltage, current, temperature, etc. of the battery pack 1 and controlling and managing the same to prevent overcharging and overdischarging, etc. In this case, the battery pack 1 may include a plurality of battery modules 10, sensors 12, switching units 14, and battery management systems 20.

[0025] Here, the switching unit 14 is an element for controlling the flow of current for charging or discharging the multiple battery modules 10, and may be, for example, at least one relay, electromagnetic contactor, etc., depending on the specifications of the battery pack 1.

[0026] The battery management system 20 is an interface that receives input of measured values ​​of the various parameters described above, and may include a plurality of terminals, and a circuit connected to these terminals and capable of processing the input values. The battery management system 20 may also control the ON / OFF of the switching unit 14, for example, a relay or a contactor, and may be connected to the battery modules 10 to monitor the status of each battery module 10.

[0027] Meanwhile, in the battery management system 20 of the present invention, as described below, a regression analysis on the voltage of the battery cell can be performed via another program. Also, the calculated regression equation can be used to classify the type of abnormality in the battery cell.

[0028] The upper controller 2 can transmit a control signal for the battery module 10 to the battery management system 20. Thus, the operation of the battery management system 20 can be controlled based on the signal applied from the upper controller 2.

[0029] FIG. 2 is a block diagram illustrating a battery charge depth calculation device according to one embodiment disclosed herein. Referring to FIG. 2, the battery charge depth calculation device 100 according to an embodiment disclosed herein may include an information acquisition unit 110, a resistance calculation unit 120, and a charge depth calculation unit 130. In an embodiment, the information acquisition unit 110, the resistance calculation unit 120, and the charge depth calculation unit 130 may be realized as one module. In an embodiment, the information acquisition unit 110, the resistance calculation unit 120, and the charge depth calculation unit 130 may be included in a controller (e.g., a processor, an MCU, an ECU). In an embodiment, the battery charge depth calculation device 100 may be included in the BMS 20 shown in FIG. 1. However, without being limited thereto, according to an embodiment, the battery charge depth calculation device 100 may be included in another device (e.g., a computer, etc.) rather than being included in a battery pack (e.g., the battery pack 1 in FIG. 1).

[0030] The information acquiring unit 110 can acquire an open circuit voltage (OCV) value corresponding to the SOC (State of Charge) of the battery cell. For example, the information acquiring unit 110 can acquire an OCV value for each SOC.

[0031] The information acquiring unit 110 can acquire information on the voltage value according to the SOC when the battery cell is being charged. For example, the information acquiring unit 110 can acquire information on the voltage value according to the SOC when the battery cell is being charged for each C-rate at which the battery cell is being charged. Depending on the embodiment, the voltage value according to the SOC when the battery cell is being charged may be directly measured by the information acquiring unit 110 or may be acquired from another measuring device that measures the voltage and current of the battery cell. According to an embodiment, the information acquiring unit 110 may transmit the acquired information to the resistance calculating unit 120 or the charging depth calculating unit 130 .

[0032] The resistance calculation unit 120 can calculate an internal resistance value corresponding to the SOC of the battery cell when charging, based on information on the voltage value corresponding to the SOC of the battery cell and the open circuit voltage value (OCV 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.

[0033] The resistance calculation unit 120 divides the calculated overvoltage value corresponding to the SOC of the battery cell by the current value flowing through the battery cell to calculate an internal resistance value corresponding to the SOC when the battery cell is being charged. For example, the resistance calculation unit 120 can calculate the internal resistance value when the battery cell is being charged for each SOC of the battery cell. As another example, the current value flowing through the battery cell may be acquired from the information acquisition unit 110 or may be acquired from a battery pack including the battery cell.

[0034] According to an embodiment, the resistance calculation unit 120 may calculate the internal resistance value of the battery cell during charging for each C-rate at which the battery cell is charged. 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 C-rate.

[0035] The charge depth calculation unit 130 can calculate the charge depth of the battery cell based on the internal resistance value. For example, the charge depth calculation unit 130 can calculate the charge depth of the negative electrode of the battery cell based on the internal resistance value calculated by the resistance calculation unit 120. According to an embodiment, since the graphs of the internal resistance value of the entire battery cell and the internal resistance value of the negative electrode of the battery cell have similar shapes as described later in FIG. 3, the charge depth calculation unit 130 can calculate the charge depth of the negative electrode of the battery cell based on the internal resistance value.

[0036] The charge depth calculation unit 130 may compare the internal resistance value with a preset value. For example, the charge depth calculation unit 130 may calculate the charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value. According to an embodiment, the preset value may be 2 ohms. According to an embodiment, the charge depth calculation unit 130 may calculate the SOC of the battery cell when the internal resistance value reaches the preset value as the charge depth of the negative electrode.

[0037] According to an embodiment, the charge depth calculation unit 130 may calculate the charge depth of the negative electrode of the battery cell for each C-rate at which the battery cell is charged. For example, the charge depth of the negative electrode of the battery cell may be lower as the C-rate is higher and may be higher as the C-rate is lower. As another example, as the C-rate becomes higher, the precipitation of ions contained in the negative electrode of the battery cell becomes faster, so that the charge depth may be lower.

[0038] In one embodiment, the charge depth of the negative electrode of the battery cell calculated by the charge depth calculation unit 130 can be used when generating a charge protocol for the battery cell. For example, based on the charge depth of the negative electrode calculated corresponding to the C-rate, the charge protocol can be set so that charging is performed up to the charge depth at the C-rate.

[0039] In one embodiment, the charge depth may be a point at which precipitation of ions contained in a battery cell occurs. For example, the charge depth of a negative electrode may be a point at which precipitation of ions contained in a negative electrode of a battery cell occurs. When precipitation of ions occurs, charging should not proceed any further at the C-rate, so it is important to calculate the charge depth and determine a fast charging protocol.

[0040] A battery charge depth calculation device according to one embodiment disclosed in this document can calculate an internal resistance value of a battery cell for each C-rate, and can calculate the charge depth of the battery cell based on the calculated internal resistance value.

[0041] The device for calculating the depth of charge of a battery according to an embodiment disclosed herein analyzes the change in internal resistance value as being caused by the negative electrode, and can be used as a guide to the depth of charge, thereby allowing the depth of charge to be calculated based on the internal resistance value.

[0042] The battery charge depth calculation device according to one embodiment disclosed in this document can calculate the charge depth using the large cell itself, without fabricating a three-electrode mono-cell type.

[0043] FIG. 3 is a diagram showing the internal resistance value of a battery cell for each C-rate according to an embodiment disclosed herein. Referring to FIG. 3, it can be seen that the internal resistance value 30 of the entire battery cell according to the charging C-rate changes according to the SOC. It can also be seen that the internal resistance value (40) of the negative electrode of the battery cell according to the charging C-rate changes according to the SOC.

[0044] It can be seen that the graphs of the overall battery cell internal resistance (30) according to the charging C-rate and the negative electrode internal resistance (40) according to the charging C-rate are similar in outline to each other. In other words, it can be determined that the change in the overall battery cell internal resistance is due to the change in the negative electrode internal resistance of the battery cell.

[0045] Therefore, the battery charge depth calculation device 100 according to one embodiment can predict the internal resistance value of the negative electrode of the battery cell based on the internal resistance value (30) of the entire battery cell, without separately calculating the internal resistance value (40) of the negative electrode of the battery cell.

[0046] FIG. 4 is a diagram showing an example of the state of charge calculated by the battery state of charge calculation device according to an embodiment disclosed herein. 4, the battery charge depth calculation device (the battery charge depth calculation device 100 in FIG. 2) can calculate the internal resistance value of a battery cell. For example, the battery charge depth calculation device 100 can calculate the internal resistance value of a battery cell for each SOC of the battery cell. In addition, the battery charge depth calculation device 100 can calculate the internal resistance value of a battery cell for each C-rate to be charged.

[0047] The battery charge depth calculation device 100 can compare the calculated internal resistance value of the battery cell with a preset value 50. For example, in FIG. 4, the preset value may be 2 ohms.

[0048] The battery charge depth calculation device 100 can calculate the SOC of a battery cell whose internal resistance value corresponds to a preset value (50) as the charge depth (60) of the negative electrode of the battery cell at that C-rate. For example, when the C-rate is 2C, the battery charge depth calculation device 100 can calculate the charge depth of the negative electrode of the battery cell as SOC 40. As another example, when the C-rate is 1C, the battery charge depth calculation device 100 can set the charge depth of the negative electrode of the battery cell to SOC 70.

[0049] The charge depth of the negative electrode of the battery cell calculated by the battery charge depth calculation device 100 can be used when setting a charging protocol. For example, a user can set a charging protocol to charge to SOC 40 at 2 C-rate, charge to SOC 45 at 1.75 C-rate, and charge to SOC 55 at 1.5 C-rate based on the charge depth of the negative electrode of the battery cell calculated by the battery charge depth calculation device 100. Although five C-rates are illustrated in FIG. 4, the present invention is not limited thereto, and the battery charge depth calculation device 100 can calculate the charge depth of the battery cell corresponding to various C-rates. Therefore, a charging profile can be set more finely based on the charge depth of the negative electrode of the battery cell.

[0050] FIG. 5 is a flowchart illustrating a method of operation of the battery charge depth calculation device according to one embodiment disclosed herein. Referring to FIG. 5, an operation method of the battery charge depth calculation device 100 according to one embodiment disclosed in this document can include a step (S110) of acquiring information on an open circuit voltage value corresponding to the SOC of the battery cell and a voltage value corresponding to the SOC when the battery cell is being charged, a step (S120) of calculating an internal resistance value corresponding to the SOC when the battery cell is being charged based on the information on the voltage value corresponding to the SOC when the battery cell is being charged and the open circuit voltage value corresponding to the SOC of the battery cell, and a step (S130) of calculating a charge depth of the negative electrode of the battery cell based on the internal resistance value.

[0051] In the step (S110) of acquiring information on an open circuit voltage value according to the SOC of the battery cell and a voltage value according to the SOC when the battery cell is being charged, the information acquiring unit 110 can acquire an open circuit voltage (OCV) value according to the SOC (State of Charge) of the battery cell. For example, the information acquiring unit 110 can acquire an OCV value for each SOC.

[0052] In step S110, the information acquiring unit 110 can acquire information on the voltage value corresponding to the SOC when the battery cell is being charged. For example, the information acquiring unit 110 can acquire information on the voltage value corresponding to the SOC when the battery cell is being charged for each C-rate at which the battery cell is being charged. Depending on the embodiment, the voltage value corresponding to the SOC when the battery cell is being charged may be directly measured by the information acquiring unit 110, or may be acquired from another measuring device that measures the voltage and current of the battery cell.

[0053] In a step (S120) of calculating an internal resistance value according to the SOC when the battery cell is charged, based on information on the voltage value according to the SOC when the battery cell is charged and an open circuit voltage value according to the SOC of the battery cell, the resistance calculation unit 120 can calculate the internal resistance value when the battery cell is charged. For example, the resistance calculation unit 120 can calculate the internal resistance value according to the SOC when the battery cell is charged, based on information on the voltage value according to the SOC when the battery cell is charged and an open circuit voltage value according to the SOC of the battery cell.

[0054] In the step (S130) of calculating the charge depth of the negative electrode of the battery cell based on the internal resistance value, the charge depth calculation unit 130 may calculate the charge depth of the negative electrode of the battery cell based on the calculated internal resistance value. For example, the charge depth calculation unit 130 may calculate the charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value. As another example, the charge depth of the negative electrode of the battery cell may be used when setting a charging protocol for the battery cell.

[0055] FIG. 6 is a flowchart specifically illustrating a method of operating the battery charge depth calculation device according to an embodiment disclosed herein. 6, the method of operating the battery charge depth calculation device 100 according to an embodiment disclosed herein may include a step (S210) of 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, and a step (S220) of dividing the calculated overvoltage value according to the SOC of the battery cell by a current value flowing through the battery cell to calculate an internal resistance value according to the SOC during charging of the battery cell. According to an embodiment, steps S210 and S220 may be included in step S120 of FIG. 5.

[0056] 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 internal resistance value according to the SOC of the battery cell when it is being charged, based on information on the voltage value according to the SOC of the battery cell and the open circuit voltage value (OCV value) according to the SOC of the battery cell. For example, 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. In this case, the resistance calculation unit 120 can calculate the overvoltage value for each SOC of the battery cell.

[0057] In a step (S220) of dividing the calculated overvoltage value according to the SOC of the battery cell by the current value flowing through the battery cell to calculate an internal resistance value according to the SOC when the battery cell is being charged, the resistance calculation unit 120 can divide the calculated overvoltage value according to the SOC of the battery cell by the current value flowing through the battery cell to calculate an internal resistance value according to the SOC when the battery cell is being charged. For example, the resistance calculation unit 120 can calculate the internal resistance value when the battery cell is being charged for each SOC of the battery cell. As another example, the current value flowing through the battery cell may be acquired from the information acquisition unit 110 or may be acquired from a battery pack including the battery cell.

[0058] According to an embodiment, the resistance calculation unit 120 may calculate the internal resistance value of the battery cell during charging for each C-rate at which the battery cell is charged. 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 C-rate.

[0059] FIG. 7 is a block diagram showing a hardware configuration of a computing system for performing an operation method of a battery charge depth calculation device according to an embodiment disclosed herein.

[0060] Referring to FIG. 7, a computing system 1000 according to one embodiment disclosed in this document may include an MCU 1010, a memory 1020, an input / output I / F 1030, and a communication I / F 1040.

[0061] The MCU 1010 may be a processor that executes various programs (e.g., a battery pack voltage or current collection program, a relay control program included in the battery pack, an internal resistance calculation program, etc.) stored in the memory 1020, processes various information including the battery internal resistance and comparison information between the battery internal resistance and a preset value through such programs, and performs the functions of the battery charge depth calculation device shown in FIG. 2 described above.

[0062] The memory 1020 can store various programs related to the collection and diagnosis of battery log information, and can also store various information such as the battery current, voltage, internal resistance value, OCV value, charging protocol information, and charging C-rate information.

[0063] A plurality of such memories 1020 may be provided as necessary. The memory 1020 may be a volatile memory or a non-volatile memory. The memory 1020 as a volatile memory may be a RAM, a DRAM, an SRAM, or the like. The memory 1020 as a non-volatile memory may be a ROM, a PROM, an EAROM, an EPROM, an EEPROM, a flash memory, or the like. The examples of the memory 1020 listed above are merely illustrative and are not limited to these examples.

[0064] 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 to enable data transmission and reception.

[0065] 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 of various devices that support wired or wireless communication. For example, the battery charge depth calculation device may transmit and receive information such as a relay control program included in a battery pack and various battery pack currents, currents, or internal resistance values ​​from a separately provided external server via the communication I / F 1040.

[0066] In this manner, a computer program according to 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 performing each function shown in FIG. 2.

[0067] 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.

[0068] Therefore, the embodiments disclosed in this document are intended to explain, not to 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 below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of this document.

Claims

1. an information acquisition unit that acquires information on an open circuit voltage (OCV) value corresponding to a state of charge (SOC) of a battery cell and a voltage value corresponding to the SOC when the battery cell is being charged; a resistance calculation unit that calculates an internal resistance value corresponding to an SOC at the time of charging the battery cell based on information on a voltage value corresponding to an SOC at the time of charging the battery cell and an open circuit voltage value corresponding to an SOC of the battery cell; a charge depth calculation unit that calculates a charge depth of the negative electrode of the battery cell based on the internal resistance value; A battery charge depth calculation device comprising:

2. The charging depth calculation unit is 2. The battery charge depth calculation device according to claim 1, further comprising: a step of calculating a charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value.

3. 3. The device for calculating the depth of charge of a battery according to claim 2, wherein the preset value is 2 ohms.

4. The resistance calculation unit calculating an overvoltage value according to the SOC of the battery cell, the overvoltage value being 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; 4. The battery charge depth calculation device according to claim 1, further comprising: a charging section for charging the battery cell and a charging current flowing through the battery cell, the charging current flowing through the battery cell being divided by the overvoltage value calculated according to the SOC of the battery cell, to calculate an internal resistance value according to the SOC of the battery cell during charging.

5. The resistance calculation unit 4. The battery charge depth calculation device according to claim 1, wherein an internal resistance value according to an SOC during charging of the battery cell is calculated for each C-rate at which the battery cell is charged.

6. The charging depth calculation unit is The battery charge depth calculation device according to claim 5 , further comprising: a charging depth calculation unit for calculating a charging depth of a negative electrode of the battery cell for each of the C-rates.

7. The battery charge depth calculation device according to claim 1 , wherein the charge depth of the negative electrode of the battery cell is used when generating a charging protocol for the battery cell.

8. The charge depth is The device for calculating a depth of charge of a battery according to claim 1 , wherein the SOC is an SOC at which precipitation of ions contained in the battery cell occurs.

9. Obtaining information regarding an open circuit voltage (OCV) value according to an SOC of a battery cell and a voltage value according to an SOC during charging of the battery cell; calculating an internal resistance value according to an SOC during charging of the battery cell based on information on a voltage value according to an SOC during charging of the battery cell and an open circuit voltage value according to an SOC of the battery cell; calculating a charge depth of a negative electrode of the battery cell based on the internal resistance value; A method for operating a battery charge depth calculation device, comprising:

10. The step of calculating a charge depth of the negative electrode of the battery cell based on the internal resistance value includes: The method for operating the battery charge depth calculation device according to claim 9 , further comprising the steps of: calculating the charge depth of the negative electrode of the battery cell by comparing the internal resistance value with a preset value.

11. The step of calculating an internal resistance value according to an SOC during charging of the battery cell based on information on a voltage value according to an SOC during charging of the battery cell 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, the overvoltage value being 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; and dividing the calculated overvoltage value corresponding to the SOC of the battery cell by a current value flowing through the battery cell to calculate an internal resistance value corresponding to the SOC of the battery cell during charging.

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