Battery status management device and its operating method

Abstract

A battery state management device according to one embodiment disclosed in this document may include an information acquisition unit that acquires the capacity, voltage, and SOH (State of Health) of a battery cell corresponding to a charge / discharge cycle, and a controller that calculates a capacity-voltage differential value (dQ / dV) corresponding to the charge / discharge cycle of the battery cell based on the capacity and the voltage, and determines the state of the battery cell based on the capacity-voltage differential value corresponding to the charge / discharge cycle and the SOH of the battery cell.

Description

Technical Field

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2022-0060637 filed on May 18, 2022, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference as part of this specification.

[0002] The embodiments disclosed in this document relate to a battery state management device and an operating method thereof.

Background Art

[0003] In recent years, research and development on secondary batteries have been actively conducted. Here, a secondary battery is a battery that can be charged and discharged, and includes both conventional Ni / Cd batteries, Ni / MH batteries, etc. and recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density compared to conventional Ni / Cd batteries, Ni / MH batteries, etc. In addition, since lithium-ion batteries can be manufactured in a small and lightweight form, they are used as a power source for mobile devices. In recent years, their usage range has been extended to the power source of electric vehicles and they have attracted attention as a next-generation energy storage medium.

[0004] When venting occurs in a lithium-ion battery, problems can directly occur in the battery, such as a decrease in the performance of the cell and an increased possibility of ignition due to leakage of the electrolyte. Therefore, a technique for determining the presence or absence of venting in the battery is required.

Summary of the Invention

Problems to be Solved by the Invention

[0005] One object of the embodiments disclosed in this document is to provide a battery state management device capable of determining the venting of a battery cell and an operating method thereof. One object of the embodiments disclosed in this document is to provide a battery state management device capable of accurately determining the venting of a battery cell based on changes in the voltage and capacity of the battery cell and an operating method thereof.

[0006] The technical problems of the embodiments disclosed in this document are not limited to those mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] A battery state management device according to one embodiment disclosed herein may include: an information acquisition unit that acquires the capacity, voltage, and State of Health (SOH) of a battery cell corresponding to a charge-discharge cycle; and a controller that calculates the differential value (dQ / dV) of the capacity voltage corresponding to the charge-discharge cycle of the battery cell based on the capacity and voltage, and determines the state of the battery cell based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell.

[0008] In one embodiment, the controller can calculate the slope of a graph based on the differential value of the capacitance voltage and the SOH of the battery cell, and determine whether or not venting has occurred in the battery cell based on the slope.

[0009] In one embodiment, the controller can calculate the difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage, and then calculate the slope by associating the calculated difference with the SOH.

[0010] In one embodiment, the controller can control the maximum value of the charging voltage of the battery cell and the charging current of the battery cell to decrease when the tilt changes from a first section in which the tilt is maintained to a second section in which the tilt increases.

[0011] In one embodiment, the controller can determine that venting has occurred in the battery cell when the tilt changes from the second section to a third section in which the tilt decreases.

[0012] In one embodiment, the controller can be configured to display the graph as a value obtained by processing the derivative of the capacitance voltage using dynamic time warping.

[0013] In one embodiment, the horizontal axis of the graph may represent the SOH, and the vertical axis may represent the differential value of the capacitance voltage processed by the dynamic time stretching method. In one embodiment, the SOH may include SOHQ corresponding to the degree of capacity degradation of the battery cell.

[0014] In one embodiment, the controller can calculate the SOHQ as the ratio of the discharge capacity of a particular cycle to the discharge capacity of the first charge-discharge cycle.

[0015] In one embodiment, the information acquisition unit can acquire the capacity, voltage, and SOH of the battery cell within a specific voltage range. In one embodiment, the specific voltage range may be 3.2V to 3.4V.

[0016] In one embodiment, the controller can control the maximum charging voltage of the battery cell and the charging current of the battery cell to decrease when the absolute value of the average of the slope changes from a first interval where the absolute value of the average of the slope is less than or equal to a first set value to a second interval where the absolute value of the average of the slope is greater than or equal to the first set value.

[0017] In one embodiment, the controller can determine that venting has occurred in the battery cell when the second section changes to a third section in which the absolute value of the average of the slope decreases to or less than a second setpoint.

[0018] An operating method for a battery state management device according to one embodiment disclosed herein may include the steps of: acquiring the capacity, voltage, and State of Health (SOH) of a battery cell corresponding to a charge-discharge cycle; calculating the differential value (dQ / dV) of the capacity voltage of the battery cell corresponding to the charge-discharge cycle based on the capacity and voltage; calculating the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell; and determining whether or not venting has occurred in the battery cell based on the slope.

[0019] In one embodiment, the step of calculating the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the state of health (SOH) of the battery cell may include the steps of calculating the difference between the differential value of the capacity voltage corresponding to the charge-discharge cycle and the differential value of the reference capacity voltage, and calculating the slope by associating the calculated difference with the SOH. [Effects of the Invention]

[0020] A battery state management device and its operating method according to one embodiment disclosed herein can determine whether or not venting occurred in a particular cycle based on the differential value of the capacity voltage of the battery cell for each cycle.

[0021] A battery state management device and its operating method according to one embodiment disclosed herein can determine whether or not venting has occurred in a battery cell based on the amount of change in the differential value of the capacity voltage with respect to the SOHQ for each cycle of the battery cell.

[0022] A battery state management device and its operating method according to one embodiment disclosed herein can determine whether or not venting has occurred in a battery cell based on the value of a specific interval of the differential value of the capacity voltage of the battery cell. In addition, this document can provide various effects that can be understood directly or indirectly. [Brief explanation of the drawing]

[0023] [Figure 1] It is a block diagram showing the configuration of a general battery pack. [Figure 2] It is a block diagram showing a battery state management device according to an embodiment disclosed in this document. [Figure 3] It is a diagram showing an example in which a battery state management device according to an embodiment disclosed in this document processes a differential value of the capacitance voltage. [Figure 4] It is a diagram showing an example in which a battery state management device according to an embodiment disclosed in this document determines a vent of a battery cell. [Figure 5] It is a flowchart showing an operation method of a battery state management device according to an embodiment disclosed in this document. [Figure 6] It is a flowchart specifically showing an operation method of a battery state management device according to an embodiment disclosed in this document. [Figure 7] It is a block diagram showing a hardware configuration of a computing system for performing an operation method of a battery state management device according to an embodiment disclosed in this document.

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. Note that when assigning reference numerals to components in each drawing, the same components are assigned the same numerals as much as possible when they are shown on other drawings. Also, when explaining the embodiments disclosed in this document, if a specific explanation of a related known configuration or function is determined to impede the understanding of the embodiments disclosed in this document, the detailed explanation thereof will be omitted.

[0025] In describing the components of the embodiments disclosed herein, terms such as First, Second, A, B, (a), (b), etc., may be used. Such terms are merely for distinguishing a component from other components and do not limit the nature, order, or procedure of that component. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the embodiments disclosed herein belong. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and not as an ideal or overly formal meaning unless explicitly defined in this application.

[0026] Figure 1 is a block diagram showing the configuration of a typical battery pack. Referring to Figure 1, a battery control system including a battery pack 1 according to one embodiment of the present invention and a higher-level controller 2 included in a higher-level system is schematically shown.

[0027] As shown in Figure 1, the battery pack 1 consists of one or more battery cells and includes a rechargeable battery module 10, a switching unit 14 connected in series to the (+) terminal or (-) terminal of the battery module 10 for controlling the flow of charge and discharge current to the battery module 10, and a battery management system 20 that monitors the voltage, current, temperature, etc. of the battery pack 1 and controls and manages it to prevent overcharging and over-discharging. In this case, the battery pack 1 can be provided with multiple battery modules 10, sensors 12, switching units 14, and battery management systems 20.

[0028] Here, the switching unit 14 is an element for controlling the flow of current for charging or discharging the multiple battery modules 10, and depending on the specifications of the battery pack 1, at least one relay, electromagnetic contactor, etc. can be used.

[0029] The battery management system 20 is an interface that receives input values ​​of the various parameters described above, and may include a plurality of terminals and circuits connected to these terminals that process the input values. The battery management system 20 can also control the ON / OFF state of the switching unit 14, for example, a relay or contactor, and can be connected to the battery module 10 to monitor the state of each battery module 10. According to one embodiment, the battery management system 20 may include the battery state management device 100 shown in Figure 2. According to another embodiment, the battery management system 20 may be a different system from the battery state management device 100 shown in Figure 2. That is, the battery state management device 100 shown in Figure 2 may be included in the battery pack 1, or it may be configured as another device outside the battery pack 1.

[0030] The higher-level controller 2 can transmit control signals to the battery management system 20 for the battery module 10. This allows the battery management system 20 to be controlled based on the signals applied from the higher-level controller 2.

[0031] Figure 2 is a block diagram showing a battery state management device according to one embodiment disclosed in this document. Referring to Figure 2, the battery state management device 100 according to one embodiment disclosed in this document may include an information acquisition unit 110 and a controller 120. According to the embodiment, the battery state management device 100 may be included in the battery management system 20 of Figure 1, or it may be a different device from the battery management system 20 of Figure 1.

[0032] The information acquisition unit 110 can acquire the capacity, voltage, and SOH (State of Health) of the battery cell corresponding to the charge-discharge cycle. For example, the information acquisition unit 110 can acquire the capacity, voltage, and SOH of the battery cell within a specific voltage range. According to the embodiment, the specific voltage range may be 3.2V to 3.4V. According to the embodiment, SOH may include SOHQ corresponding to the degree of capacity degradation of the battery cell.

[0033] The controller 120 can calculate the derivative of the capacity voltage (dQ / dV) corresponding to the charge-discharge cycle of the battery cell, based on the capacity and voltage of the battery cell. For example, the controller 120 can calculate the derivative of the capacity voltage by differentiating the capacity of the battery cell with respect to voltage. According to the embodiment, the controller 120 can determine whether or not venting has occurred in the battery cell based on the derivative of the capacity voltage in a specific voltage range. For example, the specific voltage range may be 3.2V to 3.4V.

[0034] Figure 3 shows an example of how a battery state management device according to one embodiment disclosed in this document processes the differential value of the capacity voltage. Referring to Figure 3, the controller 120 can calculate the differential value of the capacity voltage, as shown in the graph in Figure 3, based on the capacity and voltage of the battery cells. For example, the information acquisition unit 110 can acquire the capacity and voltage of the battery cells for each charge-discharge cycle, and the controller 120 can calculate the differential value of the capacity voltage for each charge-discharge cycle.

[0035] According to one embodiment, the controller 120 can determine venting of the battery cell based on the differential value of the capacitance voltage in a specific voltage range 210. For example, the specific voltage range 210 may be the discharge termination voltage range of the battery cell. As another example, the specific voltage range may be 3.2V to 3.4V.

[0036] Referring again to Figure 2, the controller 120 can determine the state of the battery cell based on the derivative of the capacity voltage corresponding to the charge-discharge cycle and the state of health (SOH) of the battery cell. For example, the controller 120 can calculate the slope of the graph based on the derivative of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell. For example, the controller 120 can calculate the change in the derivative of the capacity voltage due to the SOH and the charge-discharge cycle and calculate the slope of the graph.

[0037] According to the embodiment, the controller 120 can calculate the difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage, and can calculate the slope by associating the calculated difference with the State of Health (SOH). For example, the derivative of the reference capacity voltage may be the derivative of the capacity voltage of the battery cell prior to the first cycle.

[0038] According to one embodiment, the controller 120 can be configured to correspond to the value obtained by processing the derivative of the capacitance voltage using dynamic time warping. For example, the controller 120 can set the value obtained by processing the derivative of the capacitance voltage using dynamic time warping on the vertical axis and the SOH value on the horizontal axis to create a graph based on the charge-discharge cycle.

[0039] According to the embodiment, SOH may include SOHQ, which corresponds to the degree of capacity degradation of the battery cell. For example, the controller 120 can calculate SOHQ as the ratio of the discharge capacity of a particular cycle to the discharge capacity of the first cycle.

[0040] According to the embodiment, the controller 120 can set up a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOHQ value corresponding to the charge-discharge cycle, and can determine whether or not venting has occurred in the battery cell based on the slope of the graph. For example, the controller 120 can calculate the difference between the differential value of the capacity voltage corresponding to the charge-discharge cycle and the differential value of the reference capacity voltage, set the value obtained by processing the calculated difference using the dynamic time stretching method on the vertical axis, set the SOHQ value on the horizontal axis, and set up a graph based on the charge-discharge cycle.

[0041] The controller 120 can control the battery cells to decrease the maximum charging voltage and reduce the charging current when the slope changes from a first section where the slope is maintained to a second section where the slope increases. For example, the controller 120 can determine that the probability of venting in the battery cells increases when the slope increases after being maintained (when changing from the first section to the second section), and therefore can control the battery cells to decrease the maximum charging voltage and reduce the charging current in order to prevent venting from occurring. According to the embodiment, the controller 120 can set the section in which the absolute value of the average slope is less than or equal to a first set value as the first section, and the section in which the absolute value of the average slope changes to greater than or equal to a second set value as the second section.

[0042] The controller 120 can determine that venting has occurred in the battery cell when the gradient changes from the second interval to the third interval where the gradient decreases. For example, if venting occurs in the battery cell, the gradient, which was rising in the second interval, can change to the third interval where the gradient decreases. According to the embodiment, the controller 120 can set the third interval from the second interval, where the absolute value of the average gradient is greater than or equal to the second set value, to the interval where the absolute value of the average gradient decreases to or less than the third set value.

[0043] According to the embodiment, the slope can be calculated by determining the difference between the differential value of the capacity voltage corresponding to the charge-discharge cycle and the differential value of the reference capacity voltage. The calculated difference can be processed using a dynamic time stretching method and set on the vertical axis, the SOHQ value on the horizontal axis, and the slope of the graph due to the charge-discharge cycle.

[0044] According to the embodiment, the controller 120 can learn cycles that change from a first section to a second section. For example, the controller 120 can learn cycles that change from the first section to the second section for each charge / discharge condition. In this case, the controller 120 can suppress the occurrence of venting in the battery cells by setting the charge / discharge conditions more precisely.

[0045] According to the embodiment, the controller 120 can learn cycles that change from a second section to a third section. For example, the controller 120 can learn cycles that change from a second section to a third section for each charge / discharge condition. In this case, the controller 120 can suppress the occurrence of venting in the battery cells by setting the charge / discharge conditions more precisely.

[0046] A battery state management device 100 according to one embodiment disclosed herein can determine whether or not venting occurred in a particular cycle based on the differential value of the capacity voltage of the battery cell for each cycle.

[0047] A battery state management device 100 according to one embodiment disclosed herein can determine whether or not venting has occurred in a battery cell based on the amount of change in the differential value of the capacity voltage with respect to the SOHQ for each cycle of the battery cell.

[0048] A battery state management device 100 according to one embodiment disclosed herein can determine whether or not venting has occurred in a battery cell based on the value of a specific interval of the differential value of the capacity voltage of the battery cell.

[0049] Figure 4 shows an example of a battery state management device according to one embodiment disclosed in this document that determines venting of a battery cell. Referring to Figure 4, the controller 120 can set up a graph corresponding to a charge-discharge cycle, with the horizontal axis set to SOHQ and the vertical axis set to the change in the differential value of the capacitance voltage processed by dynamic time stretching. For example, SOHQ can be calculated as the ratio of the discharge capacity of a particular cycle to the discharge capacity of the first cycle. As another example, the change in the differential value of the capacitance voltage can be calculated as the difference between the differential value of the capacitance voltage corresponding to the charge-discharge cycle and the differential value of the reference capacitance voltage.

[0050] The controller 120 can distinguish between a first section where the slope is maintained, a second section where the slope increases, and a third section where the increased slope decreases. For example, the controller 120 can identify cycles of change from the first section to the second section, and cycles of change from the second section to the third section. In this case, the controller 120 can control the battery cell to decrease the maximum charging voltage and reduce the charging current from the cycle of change from the first section to the second section. The controller 120 can also determine that venting has occurred in the battery cell from the cycle of change from the second section to the third section.

[0051] According to the embodiment, the cycles of the first, second, and third intervals can be varied depending on the charge and discharge conditions. For example, when charging with a higher current or voltage (e.g., in the case of fast charging), the battery cell can change from the first to the second interval and from the second to the third interval faster than when charging under normal conditions.

[0052] According to the embodiment, the controller 120 can learn the cycles of the first, second, and third intervals. For example, the controller 120 can learn the cycles of the first, second, and third intervals based on the charge and discharge conditions.

[0053] Figure 5 is a flowchart showing the operation method of a battery state management device according to one embodiment disclosed in this document. According to the embodiment, the operation method of the battery state management device can be performed via the battery state management device 100 shown in Figure 2.

[0054] Referring to Figure 5, the operation method of the battery state management device 100 according to one embodiment disclosed in this document may include the steps of: acquiring the capacity, voltage, and SOH of the battery cell corresponding to the charge-discharge cycle (S110); calculating the differential value of the capacity voltage corresponding to the charge-discharge cycle of the battery cell based on the capacity and voltage (S120); calculating the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell (S130); and determining whether or not venting has occurred in the battery cell based on the slope (S140).

[0055] In step (S110), which involves acquiring the capacity, voltage, and SOH of a battery cell corresponding to a charge-discharge cycle, the information acquisition unit 110 can acquire the capacity, voltage, and SOH of a battery cell corresponding to a charge-discharge cycle. For example, SOH may include SOHQ, which corresponds to the degree of capacity degradation of the battery cell. According to one embodiment, SOHQ can be calculated as the ratio of the discharge capacity of a particular cycle to the discharge capacity of the first cycle.

[0056] In step (S120), which calculates the derivative of the capacity voltage corresponding to the charge-discharge cycle of the battery cell based on its capacity and voltage, the controller 120 can calculate the derivative of the capacity voltage (dQ / dV) corresponding to the charge-discharge cycle of the battery cell based on its capacity and voltage. For example, the controller 120 can calculate the derivative of the capacity voltage based on the capacity and voltage of the battery cell, calculate the difference between the calculated derivative of the capacity voltage and the derivative of the reference capacity voltage, and process the calculated difference using Dynamic Time Warping.

[0057] In step (S130), which calculates the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell, the controller 120 can calculate the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell. For example, the controller 120 can set the calculated difference processed by dynamic time stretching on the vertical axis and the SOHQ on the horizontal axis to set a graph corresponding to the charge-discharge cycle. Based on the set graph, the controller 120 can calculate the slope for each charge-discharge cycle.

[0058] In step S140, which determines whether or not venting has occurred in the battery cell based on the tilt, the controller 120 can determine whether or not venting has occurred in the battery cell based on the calculated tilt. For example, when the tilt changes from a first section where the tilt is maintained to a second section where the tilt increases, the controller 120 can prevent venting of the battery cell by controlling the maximum value of the charging voltage of the battery cell and reducing the charging current of the battery cell. Also, when the tilt changes from the second section to a third section where the tilt decreases, the controller 120 can determine that venting has occurred in the battery cell. In this case, the controller 120 can communicate to the user that venting has occurred in the battery cell and can issue an alarm to instruct them to replace the battery cell.

[0059] Figure 6 is a flowchart specifically illustrating the operation method of a battery state management device according to one embodiment disclosed in this document. Referring to Figure 6, the operation method of the battery state management device 100 may include the steps of calculating the difference between the differential value of the capacity voltage corresponding to the charge-discharge cycle and the differential value of the reference capacity voltage (S210), and calculating the slope by relating the calculated difference to the SOH (State of Health) (S220). According to the embodiment, steps S210 and S220 can be included in step S130 in Figure 5.

[0060] In step (S210), which calculates the difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage, the controller 120 can calculate the difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage.

[0061] In step (S220), where the calculated difference is associated with SOH to calculate the slope, the controller 120 can calculate the slope by associating the calculated difference with SOH. For example, the controller 120 can calculate the slope corresponding to the charge-discharge cycle by associating the calculated difference with SOHQ.

[0062] Figure 7 is a block diagram showing the hardware configuration of a computing system for performing the operation method of a battery state management device according to one embodiment disclosed in this document.

[0063] Referring to Figure 7, the computing system 1000 according to one embodiment disclosed in this document may include an MCU 1010, a memory 1020, an input / output interface 1030, and a communication interface 1040.

[0064] The MCU1010 may be a processor that executes various programs stored in memory 1020 (for example, a battery pack voltage or current acquisition program, a battery cell capacity and voltage acquisition program, a battery cell SOH calculation program, a battery cell differential voltage calculation program, etc.), processes various information including the differential voltage or battery cell SOHQ through such programs, and performs the functions of the controller included in the battery state management device shown in Figure 2 above.

[0065] Memory 1020 can store various programs, such as battery cell capacity, voltage acquisition and calculation of the differential value of the capacitance voltage, and SOH calculation programs. Memory 1020 can also store various information, such as the battery cell current, voltage, capacity, SOHQ, the differential value of the capacitance voltage, and the slope of a graph set based on the SOH.

[0066] Multiple such memory 1020s may be provided as needed. Memory 1020 may be volatile memory or non-volatile memory. As volatile memory, RAM, DRAM, SRAM, etc., can be used for memory 1020. As non-volatile memory, ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc., can be used for memory 1020. The examples of memory 1020 listed above are merely illustrative and are not limiting.

[0067] The input / output interface 1030 can provide an interface that connects input devices (not shown), such as keyboards, mice, and touch panels, with output devices (not shown), such as displays, and the MCU 1010, enabling data transmission and reception.

[0068] The communication interface 1040 is configured to send and receive various data with a server and may be various devices that support wired or wireless communication. For example, the battery status management device can send and receive information such as the voltage, current, state of health (SOH), differential value of the capacity voltage, a graph based on the differential value of the capacity voltage and the SOH of the battery cell, the slope of the graph, and whether or not a vent has occurred in the battery cell from a separately provided external server via the communication interface 1040.

[0069] Thus, the computer program according to one embodiment disclosed in this document may be recorded in memory 1020 and processed by MCU 1010 to be implemented as a module that performs, for example, the functions shown in Figure 2.

[0070] The above description is merely illustrative of the technical concept disclosed in this document, and any person with ordinary skill in the art to which the embodiments disclosed in this document belong can make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0071] Therefore, the embodiments disclosed herein are for illustrative purposes only, not to limit, the technical ideas disclosed herein, and such embodiments do not limit the scope of the technical ideas disclosed herein. The scope of protection for the technical ideas disclosed herein shall be interpreted in accordance with the claims described below, and all technical ideas within an equivalent scope shall be interpreted as being included in the scope of rights of this document.

Claims

1. An information acquisition unit that acquires the capacity, voltage, and SOH (State of Health) of the battery cell corresponding to the charge-discharge cycle, Based on the capacity and voltage, the differential value (dQ / dV) of the capacity voltage corresponding to the charge-discharge cycle of the battery cell is calculated. A controller that determines whether or not venting has occurred in the battery cell based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the state of health (SOH) of the battery cell, A battery status management device, including a battery status management device.

2. The aforementioned controller, The slope of the graph based on the differential value of the capacitance voltage and the SOH of the battery cell is calculated. The battery state management device according to claim 1, which determines whether or not venting has occurred in the battery cell based on the tilt.

3. The aforementioned controller, The difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage is calculated. The battery state management device according to claim 2, wherein the slope of a graph is calculated with the calculated difference as one axis and the SOH as the other axis.

4. The aforementioned controller, The battery state management device according to claim 2 or 3, wherein when the slope changes from a first section in which the slope is maintained to a second section in which the slope increases, the maximum value of the charging voltage of the battery cell is reduced and the charging current of the battery cell is reduced.

5. The aforementioned controller, The battery state management device according to claim 4, which determines that venting has occurred in the battery cell when the second section changes to a third section in which the inclination decreases.

6. The aforementioned controller, The battery state management device according to claim 2 or 3, wherein the graph is set to correspond to a value obtained by processing the differential value of the capacitance voltage using a dynamic time stretching method.

7. The battery state management device according to claim 6, wherein the horizontal axis of the graph is the SOH, and the vertical axis is the differential value of the capacitance voltage processed by the dynamic time stretching method.

8. The aforementioned SOH is, The battery state management device according to claim 2 or 3, comprising an SOHQ corresponding to the degree of capacity degradation of the battery cell.

9. The aforementioned controller, The battery state management device according to claim 8, wherein the SOHQ is calculated as the ratio of the discharge capacity of a specific cycle to the discharge capacity of the first charge-discharge cycle.

10. The aforementioned information acquisition unit, A battery state management device according to any one of claims 1 to 3, which acquires the capacity, voltage, and SOH of the battery cell in a specific voltage range.

11. The battery state management device according to claim 10, wherein the specified voltage range is 3.2V to 3.4V.

12. The aforementioned controller, The battery state management device according to claim 2 or 3, wherein when the absolute value of the average of the slopes changes from a first interval where the absolute value of the average of the slopes is less than or equal to a first set value to a second interval where the absolute value of the average of the slopes is greater than or equal to a second set value, the maximum value of the charging voltage of the battery cell is reduced and the charging current of the battery cell is reduced.

13. The aforementioned controller, The battery state management device according to claim 12, which determines that venting has occurred in the battery cell when the second section changes to a third section in which the absolute value of the average of the slopes decreases to or less than a third set value.

14. The steps include obtaining the capacity, voltage, and State of Health (SOH) of the battery cell corresponding to the charge-discharge cycle, A step of calculating the differential value (dQ / dV) of the capacity voltage corresponding to the charge-discharge cycle of the battery cell based on the capacity and the voltage, A step of calculating the slope of a graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell, A step of determining whether or not venting has occurred in the battery cell based on the tilt, A method for operating a battery status management device, including the operation of the battery status management device.

15. The step of calculating the slope of the graph based on the differential value of the capacity voltage corresponding to the charge-discharge cycle and the SOH of the battery cell is: A step of calculating the difference between the derivative of the capacity voltage corresponding to the charge-discharge cycle and the derivative of the reference capacity voltage, A method for operating a battery state management device according to claim 14, comprising the step of calculating the slope on a graph in which the calculated difference is one axis and the SOH is the other axis.

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