Battery state management device and operation method thereof

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 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 a battery status management apparatus 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 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 been expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0004] When venting occurs in a lithium-ion battery, it can directly cause problems for the battery, such as reducing cell performance and increasing the possibility of fire due to electrolyte leakage. Therefore, a technology to determine whether or not a battery is venting is required. Summary of the Invention [Problem to be solved by the invention]

[0005] One objective of the embodiments disclosed herein is to provide a battery state management device and an operating method thereof that can determine venting of a battery cell. One objective of the embodiments disclosed herein is to provide a battery status management device and an operating method thereof that can accurately determine venting of a battery cell based on the amount of change in the voltage and capacity of the battery cell.

[0006] 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]

[0007] 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.

[0008] In one embodiment, the controller can calculate a slope of a graph based on the differential value of the capacity voltage and the SOH of the battery cell, and determine whether venting has occurred in the battery cell based on the slope.

[0009] In one embodiment, the controller can calculate the difference between a differential value of the capacity voltage corresponding to the charge / discharge cycle and a differential value of a reference capacity voltage, and calculate the slope by matching the calculated difference with the SOH.

[0010] In one embodiment, the controller may control the charging current of the battery cell to be reduced by decreasing a maximum value of the charging voltage of the battery cell when the slope changes from a first section in which the slope is maintained to a second section in which the slope increases.

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

[0012] In one embodiment, the controller may configure the graph to correspond to a derivative of the capacitive voltage that has been subjected to 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 warping method. In one embodiment, the SOH may include an SOHQ corresponding to a capacity deterioration degree of the battery cell.

[0014] In one embodiment, the controller can calculate the SOHQ as a 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, the voltage, and the SOH in a specific voltage section of the battery cell. In one embodiment, the specific voltage range may be 3.2V to 3.4V.

[0016] In one embodiment, the controller can control the charging current of the battery cell to be reduced by decreasing a maximum value of the charging voltage of the battery cell when the absolute value of the average of the slope changes from a first section in which the absolute value of the average of the slope is less than or equal to a first set value to a second section in which 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 may determine that venting has occurred in the battery cell when the slope changes from the second interval to a third interval in which the absolute value of the average of the slope decreases below a second set value.

[0018] An operating method of a battery state management device according to one embodiment disclosed in this document may include the steps of acquiring the capacity, voltage, and SOH (State of Health) of a battery cell corresponding to a charge / discharge cycle, calculating a capacity-voltage differential value (dQ / dV) corresponding to the charge / discharge cycle of the battery cell based on the capacity and the voltage, calculating a slope of a graph based on the capacity-voltage differential value corresponding to the charge / discharge cycle and the SOH of the battery cell, and determining whether a vent 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 SOH of the battery cell may include a step of calculating the difference between the differential value of the capacity voltage corresponding to the charge / discharge cycle and the differential value of a reference capacity voltage, and a step of calculating the slope by matching the calculated difference with the SOH. Effect of the Invention

[0020] A battery state management device and an operating method thereof according to an embodiment disclosed herein can determine whether venting has occurred in a particular cycle based on a differential value of the capacity voltage of a battery cell for each cycle.

[0021] A battery state management device and an operating method thereof according to an embodiment disclosed in this document can determine whether a vent 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 of the battery cell per cycle.

[0022] A battery status management device and an operating method thereof according to an embodiment disclosed in this document can determine whether a vent has occurred in a battery cell based on a value in a specific range of the differential value of the capacity voltage of the battery cell. In addition, various other benefits may be provided by this document, either directly or indirectly. [Brief description of the drawings]

[0023] [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 a battery status management device according to an embodiment disclosed in this document. [Diagram 3] FIG. 2 is a diagram illustrating an example of a battery state management device according to an embodiment disclosed herein processing a differential value of a capacity voltage. [Figure 4] FIG. 2 is a diagram illustrating an example of a battery state management device according to an embodiment disclosed herein for determining venting of a battery cell. [Diagram 5] 1 is a flowchart illustrating an operation method of a battery state management device according to an embodiment disclosed herein. [Figure 6] 1 is a flowchart illustrating a method of operating a battery status management device according to an embodiment disclosed herein. [Figure 7] FIG. 2 is a block diagram showing the 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 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.

[0025] In describing the 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.

[0026] 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.

[0027] 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 that monitors the voltage, current, temperature, etc. of the battery pack 1 and controls and manages it to prevent overcharging and overdischarging, etc. In this case, the battery pack 1 may be provided with a plurality of 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 for example, at least one relay, electromagnetic contactor, etc. can be used depending on the specifications of the battery pack 1.

[0029] 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 the terminals for processing the input values. The battery management system 20 may also control 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 state of each of the battery modules 10. According to an embodiment, the battery management system 20 may include the battery state management device 100 of FIG. 2. According to another embodiment, the battery management system 20 may be another system different from the battery state management device 100 of FIG. 2. That is, the battery state management device 100 of FIG. 2 may be included in the battery pack 1, or may be configured as another device outside the battery pack 1.

[0030] 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.

[0031] FIG. 2 is a block diagram illustrating a battery status management device according to one embodiment disclosed herein. 2, a battery state management device 100 according to an embodiment disclosed in the present document may include an information acquisition unit 110 and a controller 120. According to an embodiment, the battery state management device 100 may be included in the battery management system 20 in FIG. 1, or may be another device different from the battery management system 20 in FIG.

[0032] The information acquiring 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 acquiring unit 110 can acquire the capacity, voltage, and SOH of the battery cell in a specific voltage range. According to an embodiment, the specific voltage range may be 3.2V to 3.4V. According to an embodiment, the SOH may include an SOHQ corresponding to the degree of capacity degradation of the battery cell.

[0033] The controller 120 can calculate a capacity-voltage differential value (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 capacity-voltage differential value by differentiating the capacity of the battery cell with the voltage. According to the embodiment, the controller 120 can determine whether or not venting has occurred in the battery cell based on the capacity-voltage differential value in a specific voltage section. For example, the specific voltage section may be 3.2V to 3.4V.

[0034] FIG. 3 is a diagram illustrating an example of a battery state management device according to an embodiment disclosed herein processing a differential value of a capacity voltage. 3, the controller 120 may calculate a capacity-voltage differential value based on the capacity and voltage of the battery cell, as shown in the graph of FIG 3. For example, the information acquisition unit 110 may acquire the capacity and voltage of the battery cell for each charge / discharge cycle, and the controller 120 may calculate a capacity-voltage differential value for each charge / discharge cycle.

[0035] According to an embodiment, the controller 120 may determine the vent of the battery cell based on the differential value of the capacity voltage in the specific voltage section 210. For example, the specific voltage section 210 may be a discharge end voltage section of the battery cell. As another example, the specific voltage section may be 3.2V to 3.4V.

[0036] 2 again, the controller 120 can determine 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. For example, 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 calculate the amount of change in the differential value of the capacity voltage due to the SOH and the charge / discharge cycle, and calculate the slope of the graph.

[0037] According to an embodiment, 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, and can calculate the slope by matching the calculated difference with the SOH. For example, the differential value of the reference capacity voltage can be the differential value of the capacity voltage of the battery cell before the first cycle.

[0038] According to an embodiment, the controller 120 may set the differential value of the capacitance voltage to correspond to a value processed by dynamic time warping. For example, the controller 120 may set the value processed by dynamic time warping of the differential value of the capacitance voltage on the vertical axis and the SOH value on the horizontal axis to set a graph according to charge and discharge cycles.

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

[0040] According to the embodiment, the controller 120 can set 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 the battery cell has vented 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, and can set the calculated difference processed by the dynamic time warping method on the vertical axis and the SOHQ value on the horizontal axis to set a graph based on the charge / discharge cycle.

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

[0042] The controller 120 may determine that venting has occurred in the battery cell when the slope changes from the second section to a third section where the slope decreases. For example, when venting occurs in the battery cell, the slope that increased in the second section may change to the third section where the slope decreases. According to the embodiment, the controller 120 may set the third section to a section where the average absolute value of the slope decreases from the second section where the average absolute value of the slope is equal to or greater than a second set value to a third set value or less.

[0043] According to an embodiment, the slope can be calculated by 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 the calculated difference processed by dynamic time warping method is set on the vertical axis, the SOHQ value is set on the horizontal axis, and the slope can be the slope of the graph due to the charge / discharge cycle.

[0044] According to the embodiment, the controller 120 can learn a cycle in which the battery changes from the first section to the second section. For example, the controller 120 can learn a cycle in which the battery changes 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 of the battery cell by setting the charge / discharge conditions in more detail.

[0045] According to the embodiment, the controller 120 can learn a cycle in which the battery changes from the second section to the third section. For example, the controller 120 can learn a cycle in which the battery changes from the second section to the third section for each charge / discharge condition. In this case, the controller 120 can suppress the occurrence of venting of the battery cell by setting the charge / discharge conditions in more detail.

[0046] The battery state management device 100 according to an embodiment disclosed herein can determine whether venting has occurred in a particular cycle based on a differential value of the capacity voltage of a battery cell for each cycle.

[0047] The battery state management device 100 according to one embodiment disclosed in this document can determine whether a vent 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 of the battery cell per cycle.

[0048] The battery status management device 100 according to one embodiment disclosed in this document can determine whether or not a vent has occurred in a battery cell based on a value in a specific range among the differential values ​​of the capacity voltage of the battery cell.

[0049] FIG. 4 is a diagram illustrating an example of a battery state management device according to an embodiment disclosed herein determining venting of a battery cell. 4, the controller 120 may set a graph corresponding to a charge / discharge cycle by setting the horizontal axis to SOHQ and the vertical axis to the amount of change in the differential value of the capacity voltage processed by the dynamic time warping method. For example, the SOHQ may be calculated as a ratio of the discharge capacity of a specific cycle to the discharge capacity of the first cycle. As another example, the amount of change in the differential value of the capacity voltage may be calculated as a difference between the differential value of the capacity voltage corresponding to the charge / discharge cycle and the differential value of a reference capacity voltage.

[0050] The controller 120 may distinguish 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 may check a cycle where the first section changes to the second section, and a cycle where the second section changes to the third section. In this case, the controller 120 may control the battery cell to decrease the maximum charging voltage and decrease the charging current of the battery cell from the cycle where the first section changes to the second section. In addition, the controller 120 may determine that a vent has occurred in the battery cell from the cycle where the second section changes to the third section.

[0051] According to the embodiment, the cycle of the first interval, the second interval, and the third interval can be changed depending on the charging and discharging conditions. For example, when charging at a higher current or voltage (e.g., in the case of fast charging), the battery cell can change from the first interval to the second interval, and from the second interval to the third interval, faster than when charging normally.

[0052] According to an embodiment, the controller 120 can learn a cycle of the first interval, the second interval, and the third interval. For example, the controller 120 can learn a cycle of the first interval, the second interval, and the third interval based on charging and discharging conditions.

[0053] 5 is a flowchart illustrating an operation method of the battery state management device according to an embodiment disclosed herein. According to the embodiment, the operation method of the battery state management device can be performed via the battery state management device 100 of FIG.

[0054] Referring to FIG. 5, an operating method of the battery state management device 100 according to one embodiment disclosed in this document can include the steps of: acquiring the capacity, voltage, and SOH of a battery cell corresponding to a charge / discharge cycle (S110); calculating a capacity-voltage derivative corresponding to the charge / discharge cycle of the battery cell based on the capacity and voltage (S120); calculating a slope of a graph based on the capacity-voltage derivative corresponding to the charge / discharge cycle and the SOH of the battery cell (S130); and determining whether a vent has occurred in the battery cell based on the slope (S140).

[0055] In the step of acquiring the capacity, voltage, and SOH of the battery cell corresponding to the charge / discharge cycle (S110), the information acquiring unit 110 can acquire the capacity, voltage, and SOH of the battery cell corresponding to the charge / discharge cycle. For example, the SOH can include SOHQ corresponding to the capacity degradation degree of the battery cell. According to an embodiment, the SOHQ can be calculated as a ratio of the discharge capacity of a specific cycle to the discharge capacity of the first cycle.

[0056] In the step (S120) of calculating a differential value of a capacity voltage corresponding to a charge / discharge cycle of the battery cell based on the capacity and the voltage, the controller 120 can calculate a differential value of a capacity voltage (dQ / dV) corresponding to a charge / discharge cycle of the battery cell based on the capacity and the voltage. For example, the controller 120 can calculate a differential value of a capacity voltage based on the capacity and the voltage of the battery cell, calculate a difference between the calculated differential value of the capacity voltage and a differential value of a reference capacity voltage, and process the calculated difference by dynamic time warping.

[0057] In the step (S130) of calculating the gradient 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, the controller 120 can calculate the gradient 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. For example, the controller 120 can set a value obtained by processing the calculated difference by the dynamic time warping method on the vertical axis and set the SOHQ on the horizontal axis to set a graph corresponding to the charge / discharge cycle. The controller 120 can calculate the gradient for each charge / discharge cycle based on the set graph.

[0058] In the step of determining whether venting has occurred in the battery cell based on the slope (S140), the controller 120 can determine whether venting has occurred in the battery cell based on the calculated slope. For example, when the slope changes from a first section in which the slope is maintained to a second section in which the slope increases, the controller 120 can prevent venting of the battery cell by reducing the maximum value of the charging voltage of the battery cell and controlling the charging current of the battery cell to decrease. Also, the controller 120 can determine that venting has occurred in the battery cell when the slope changes from the second section to a third section in which the slope decreases. In this case, the controller 120 can notify the user that venting has occurred in the battery cell and can notify the user of an alarm to replace the battery cell.

[0059] FIG. 6 is a flowchart specifically illustrating an operation method of the battery state management device according to an embodiment disclosed herein. 6, the method of operating the battery state management device 100 may include a step of calculating a difference between a differential value of a capacity voltage corresponding to a charge / discharge cycle and a differential value of a reference capacity voltage (S210), and a step of calculating a slope by associating the calculated difference with the SOH (S220). According to an embodiment, steps S210 and S220 may be included in step S130 of FIG.

[0060] In the step (S210) of calculating 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, the controller 120 can calculate 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.

[0061] In the step (S220) of calculating a slope by matching the calculated difference with the SOH, the controller 120 can calculate a slope by matching the calculated difference with the SOH. For example, the controller 120 can calculate a slope corresponding to a charge / discharge cycle by matching the calculated difference with the SOHQ.

[0062] FIG. 7 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.

[0063] 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.

[0064] The MCU 1010 may be a processor that executes various programs stored in the memory 1020 (e.g., a battery pack voltage or current collection program, a battery cell capacity and voltage collection program, a battery cell SOH calculation program, a battery cell capacity-voltage differential calculation program, etc.), processes various information including the capacity-voltage differential value or the battery cell SOHQ through such programs, and performs the functions of a controller included in the battery state management device shown in FIG. 2 described above.

[0065] The memory 1020 can store various programs such as a program for calculating the capacity and voltage of the battery cell, a program for calculating the capacity-voltage differential value, a program for calculating the SOH, etc. The memory 1020 can also store various information such as the current, voltage, capacity, SOHQ, and the slope of a graph set based on the capacity-voltage differential value and SOH of the battery cell.

[0066] A plurality of such memories 1020 may be provided as necessary. The memories 1020 may be volatile memories or non-volatile memories. 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.

[0067] 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.

[0068] 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 capable of supporting wired or wireless communication. For example, the battery state management device can transmit and receive information such as the voltage, current, SOH, and capacity-voltage differential value of various battery cells, a graph based on the capacity-voltage differential value and the SOH of the battery cells, 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 I / F 1040.

[0069] 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.

[0070] 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 knowledge in the technical field to which the embodiments disclosed in this document pertain, without departing from the essential characteristics of the embodiments disclosed in this document.

[0071] 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 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 the capacity, voltage, and SOH (State of Health) of a battery cell corresponding to a charge / discharge cycle; calculating a capacity-voltage differential value (dQ / dV) corresponding to the charge / discharge cycle of the battery cell based on the capacity and the voltage; a controller that determines a state of the battery cell based on a differential value of the capacity voltage corresponding to the charge / discharge cycle and a SOH of the battery cell; A battery status management device comprising:

2. The controller: Calculating a gradient of a graph based on the differential value of the capacity voltage and the SOH of the battery cell; The battery state management device according to claim 1 , further comprising: a determination as to whether or not venting has occurred in the battery cell based on the inclination.

3. The controller: calculating a difference between a differential value of the capacity voltage corresponding to the charge / discharge cycle and a differential value of a reference capacity voltage; The battery state management device according to claim 2 , wherein the slope is calculated by correlating the calculated difference with the SOH.

4. The controller:

4. The battery state management device according to claim 2, 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 device controls to reduce a maximum value of the charging voltage of the battery cell and to reduce a charging current of the battery cell.

5. The controller: The battery state management device according to claim 4 , wherein when the slope changes from the second section to a third section in which the slope decreases, it is determined that venting has occurred in the battery cell.

6. The controller:

4. The battery state management device according to claim 2, wherein the graph is set so as to correspond to a value obtained by processing a differential value of the capacity voltage by a dynamic time warping method.

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

8. The SOH is The battery state management device according to claim 2 or 3, further comprising a SOHQ corresponding to a capacity deterioration level of the battery cell.

9. The controller:

9. The battery state management device according to claim 8, wherein the SOHQ is calculated as a ratio of a discharge capacity of a particular cycle to a discharge capacity of an initial charge / discharge cycle.

10. The information acquisition unit The battery state management device according to claim 1 , wherein the capacity, the voltage, and the SOH are obtained in a specific voltage section of the battery cell.

11. The battery status management device according to claim 10 , wherein the specific voltage range is from 3.2 V to 3.4 V.

12. The controller:

4. A battery state management device according to claim 2, further comprising: a control unit that controls a charging current of the battery cell to be reduced by decreasing a maximum value of the charging voltage of the battery cell when the absolute value of the average of the slope changes from a first section in which the absolute value of the average of the slope is equal to or less than a first set value to a second section in which the absolute value of the average of the slope is equal to or greater than a second set value.

13. The controller: The battery state management device according to claim 12 , wherein when the slope changes from the second section to a third section in which the absolute value of the average of the slope decreases to a third set value or less, it is determined that venting has occurred in the battery cell.

14. Obtaining the capacity, voltage, and SOH (State of Health) of a battery cell corresponding to a charge / discharge cycle; calculating a capacity-voltage differential value (dQ / dV) corresponding to the charge / discharge cycle of the battery cell based on the capacity and the voltage; calculating a gradient of a graph based on a differential value of the capacity voltage corresponding to the charge / discharge cycle and the SOH of the battery cell; determining whether or not venting has occurred in the battery cell based on the slope; A method of operating a battery state management device, comprising:

15. The step of calculating a gradient of a graph based on a differential value of the capacity voltage corresponding to the charge / discharge cycle and the SOH of the battery cell, calculating a difference between a differential value of the capacity voltage corresponding to the charge / discharge cycle and a differential value of a reference capacity voltage; The method for operating a battery state management device according to claim 14, further comprising the step of: calculating the slope by correlating the calculated difference with the SOH.

Images