Battery management device and method

Abstract

A battery management device according to one embodiment of the present invention includes a profile acquisition unit configured to acquire a gas quantity profile indicating a correspondence between a gas generation amount of a battery and a peak change amount, a profile generation unit configured to generate a differential profile for a battery profile indicating a correspondence between a capacity of the battery and a differential voltage, and a control unit configured to determine a target peak change amount from a profile received from the profile generation unit, and set usage conditions of the battery based on a result of comparing the determined target peak change amount with a control criterion preset for the gas quantity profile.

Description

Technical Field

[0001] This application claims priority based on Korean Patent Application No. 10-2022-0075815, filed on June 21, 2022, and all the contents disclosed in the specification and drawings of the said application are incorporated into this application.

[0002] The present invention relates to a battery management device and method, and more particularly, to a battery management device and method capable of diagnosing the state of a battery in a non-destructive manner.

Background Art

[0003] In recent years, the demand for portable electronic products such as notebook computers, video cameras, and mobile phones has increased rapidly, and as the development of electric vehicles, energy storage batteries, robots, satellites, etc. has become full-scale, research on high-performance secondary batteries that can be repeatedly charged and discharged has been actively conducted.

[0004] Currently, commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries are attracting attention for their advantages of being able to charge and discharge freely because they hardly have a memory effect compared to nickel-based secondary batteries, having a very low self-discharge rate, and having a high energy density.

[0005] Such batteries may deteriorate as charging and discharging continue. For example, due to the generation of gas, the electron transfer force in the electrode may decrease, and there may be a variation in the deterioration of the negative electrode. In addition, since the amount of gas generated by the battery may lead to ignition, there is a problem that unexpected accidents may occur if the state of the battery is not diagnosed promptly.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been devised to solve the above problems, and an object thereof is to provide a battery management device and method capable of diagnosing the state of a battery in a non-destructive manner by analyzing a gas amount profile.

[0007] Other objects and advantages of the present invention can be understood from the following description and will become more apparent from the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and combinations thereof shown in the claims.

Means for Solving the Problems

[0008] A battery management device according to an aspect of the present invention may include: a profile acquisition unit configured to acquire a gas amount profile indicating a correspondence relationship between a gas generation amount and a change amount of a peak of a battery; a profile generation unit configured to generate a differential profile for a battery profile indicating a correspondence relationship between a capacity and a differential voltage of the battery; and a control unit configured to determine a change amount of a target peak from the differential profile received from the profile generation unit, and set a usage condition of the battery based on a result of comparing the determined change amount of the target peak with a preset control criterion for the gas amount profile.

[0009] A battery management device according to an aspect of the present invention may be characterized in that the control unit is configured to determine a target peak from the differential profile and determine the change amount of the target peak based on a result of comparing a capacity value of a preset reference peak with a capacity value of the target peak.

[0010] The battery management device according to one aspect of the present invention is configured such that the control criteria include a first control criterion for determining whether the change amount of the target peak corresponds to a first change amount or less of a reference value of the gas generation amount preset from the gas amount profile, and a second control criterion for determining whether the change amount of the target peak corresponds to a second change amount or less of a reference value of the loss amount of the negative electrode reaction area.

[0011] The battery management device according to one aspect of the present invention is characterized in that when the change amount of the target peak satisfies the first control criterion, the control unit is configured to adjust the temperature and the state of charge (SOC) of the battery and decrease the C rate.

[0012] The battery management device according to one aspect of the present invention is characterized in that when the change amount of the target peak satisfies the second control criterion, the control unit is configured to decrease the C rate.

[0013] The battery management device according to one aspect of the present invention may be characterized in that the first change amount is equal to or less than the second change amount.

[0014] The battery management device according to one aspect of the present invention may be characterized in that the gas amount profile is generated based on a differential profile for a plurality of batteries having different temperatures at a specific state of charge (SOC) and the gas generation amounts of the plurality of batteries.

[0015] The battery management device according to one aspect of the present invention may be characterized in that the gas amount profile is configured to show the correlation between the change amount of the peak determined from the differential profile for the plurality of batteries and the corresponding gas generation amount.

[0016] A battery pack according to another aspect of the present invention may include the battery management device according to one aspect of the present invention.

[0017] According to still another aspect of the present invention, a battery management method may include: a gas amount profile acquisition step of acquiring a gas amount profile indicating a correspondence relationship between a gas generation amount of a battery and a change amount of a peak; a differential profile generation step of generating a differential profile for a battery profile indicating a correspondence relationship between a capacity of the battery and a differential voltage; a target peak change amount determination step of determining a change amount of a target peak from the differential profile generated in the differential profile generation step; and a use condition setting step of setting a use condition of the battery based on a result of comparing the determined change amount of the target peak with a preset control criterion for the gas amount profile.

Advantages of the Invention

[0018] According to one aspect of the present invention, by analyzing the gas amount profile, it becomes possible to diagnose the state of the battery in a non-destructive manner.

[0019] The effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0020] The following drawings attached to this specification illustrate preferred embodiments of the present invention and are for the purpose of further understanding the technical idea of the present invention together with the content of the invention. Therefore, the present invention is not to be construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

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Figure 7

Embodiments for Carrying Out the Invention

[0022] The terms and words used in this specification and the claims are not to be construed as limited to ordinary or dictionary meanings. The inventors, in accordance with the principle that they can appropriately define the concept of terms in order to explain the invention in the best way, are construed in meanings and concepts corresponding to the technical idea of the present invention.

[0023] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Thus, there may be various equivalents and modifications that can replace them at the time of this application.

[0024] In addition, when explaining the present invention, if it is recognized that a detailed description of a known configuration or function related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0025] Expressions including ordinal numbers such as first and second are used to distinguish any one of various components from other elements, and are not used to limit the components.

[0026] Throughout the specification, when a part includes a certain component, this means that, unless otherwise specified, it may further include other components rather than excluding other components.

[0027] In the whole of the specification, when a certain part is "connected (linked)" to another part, this includes not only the case where it is "directly connected (linked)", but also the case where it is "indirectly connected (linked)" with other elements interposed therebetween.

[0028] Hereinafter, based on the accompanying drawings, preferred embodiments of the present invention will be described in detail.

[0029] FIG. 1 is a diagram schematically showing a battery management device 100 according to an embodiment of the present invention.

[0030] Referring to FIG. 1, a battery management device 100 according to an embodiment of the present invention may include a profile acquisition unit 110, a profile generation unit 120, and a control unit 130.

[0031] The profile acquisition unit 110 may be configured to acquire a gas amount profile indicating a correspondence relationship between the gas generation amount of the battery and the change amount of the peak.

[0032] Here, the battery may mean one independent cell having a negative electrode terminal and a positive electrode terminal and being physically separable. For example, a lithium ion battery or a lithium polymer battery may be regarded as a battery. Further, the battery may also mean a battery module in which a plurality of cells are connected in series and / or in parallel. Hereinafter, for ease of explanation, it will be described that the battery means one independent cell.

[0033] For example, the profile acquisition unit 110 may directly receive a gas amount profile from the outside.

[0034] The gas amount profile may mean one generated based on the differential profiles of a plurality of batteries having different temperatures at a specific SOC and the gas generation amounts of the plurality of batteries.

[0035] For example, the gas amount profile may indicate the correspondence between the gas generation amount of the battery and the change amount of the peak. Here, the gas generation amount and the change amount of the peak may be relative values. For example, the gas generation amount and the change amount of the peak may be normalized values.

[0036] Also, when the gas amount profile sets X to the change amount of the peak and Y to the total gas amount, it can be represented by an X - Y two - dimensional graph. This will be described in detail based on FIG. 2.

[0037] FIG. 2 is a diagram schematically showing the gas amount profile according to an embodiment of the present invention. In FIG. 2, a gas amount profile represented by an X - Y two - dimensional graph is shown, where X is set to the change amount of the peak and Y is set to the total gas amount. For example, in the embodiment of FIG. 2, the point indicated by ◆ shows the gas amount when the temperature of the battery with SOC 100% is maintained at 70°C. The point indicated by ■ shows the gas amount when the temperature of the battery with SOC 100% is maintained at 65°C. The point indicated by ▲ shows the gas amount when the temperature of the battery with SOC 100% is maintained at 60°C.

[0038] According to the embodiment, the gas amount profile may be configured to show the correlation between the change amount of the peak determined from the differential profiles of a plurality of batteries and the corresponding gas generation amount.

[0039] Specifically, the gas amount profile may be configured to show the correlation between the gas generation amounts corresponding to the change amounts of the peaks determined from the differential profiles of a plurality of batteries measured at different temperatures. Here, the differential profile may mean a differential voltage profile showing the correspondence between the capacity (Q) of the battery and the differential voltage (dV / dQ). Here, the capacity (Q) of the battery and the differential voltage (dV / dQ) may be relative values. For example, the capacity (Q) of the battery and the differential voltage (dV / dQ) may be normalized values. This will be described in detail with reference to FIG. 3.

[0040] FIG. 3 is a diagram schematically showing a plurality of differential profiles according to an embodiment of the present invention. FIG. 3 shows a plurality of differential profiles represented by a two-dimensional graph of X-Y, where X is set to the normalized capacitance and Y is set to the differential voltage (dV / dQ).

[0041] The gas amount profile can be generated based on the change amount of each peak of the plurality of differential profiles. For example, the change amount of the peak can be determined by the result value obtained by comparing the peak of the differential profile with the peak of the reference differential profile. The reference differential profile may mean a profile at the beginning of life (BOL).

[0042] Referring to FIG. 3, since the peak TP1 of the first differential profile is separated from the peak TP8 of the reference profile by about 17 capacitances to the left, the change amount of the peak of the first differential profile can be calculated as -17. For example, the control unit 130 can calculate the change amount of the peak of the first differential profile as -17 by subtracting the capacitance value of the peak TP1 of the first differential profile from the capacitance value of the peak TP8 of the reference profile.

[0043] Conversely, since the peak TP5 of the second differential profile is separated from the peak TP8 of the reference profile by 5 capacitances to the left, the change amount of the peak of the second differential profile can be calculated as -5.

[0044] The gas amount profile can be generated based on the change amount of the peak calculated from each of the plurality of differential profiles and the gas generation amount corresponding to each differential profile.

[0045] Returning to FIG. 2, it can be seen that the correlation between the change amount of the peak and the total gas amount is shown. Therefore, according to an embodiment of the present invention, when using the gas amount profile, the total gas amount can be accurately estimated based on the change amount of the peak.

[0046] The profile generation unit 120 can generate a differential profile for a battery profile indicating the correspondence between the capacity and the differential voltage of the battery.

[0047] Here, the differential profile may mean a differential voltage profile showing the correspondence between the capacity (Q) of the battery and the differential voltage (dV / dQ). Here, the capacity (Q) and the differential voltage (dV / dQ) of the battery can be relative values. For example, the capacity (Q) and the differential voltage (dV / dQ) of the battery can be normalized values.

[0048] The profile generation unit 120 can directly receive a differential profile from the outside, or can directly generate a differential profile by periodically receiving the voltage and capacity of the battery from the outside.

[0049] For example, the battery profile can show the correspondence between the capacity (Q) and the voltage (V) of the battery. Here, the unit of capacity is [mAh], and the unit of voltage can be [V]. Also, the battery profile can be represented by an X-Y two-dimensional graph when X is set as the capacity and Y is set as the voltage.

[0050] Then, the profile generation unit 120 can generate a differential profile corresponding to the first derivative of the battery profile. For example, the profile generation unit 120 can generate a differential voltage profile showing the correspondence between the capacity (Q) and the differential voltage (dV / dQ).

[0051] FIG. 4 is a diagram schematically showing a differential profile according to an embodiment of the present invention.

[0052] The control unit 130 can determine the target peak from the differential profile received from the profile generation unit 120. Specifically, the control unit 130 can determine one of the plurality of peaks of the differential profile as the target peak.

[0053] Generally, phase transition of the negative electrode may occur during the process of charging the battery. When the phase transition of the negative electrode occurs, a peak of the differential profile of the battery may appear. For example, when six phase transitions of the negative electrode occur, peaks Ta(1), Ta(2), Ta(3), Ta(4), Ta(5), and Ta(6) may be included in the differential profile in sequence.

[0054] For example, the control unit 130 may determine Ta(6) included in the differential profile as the target peak.

[0055] The control unit 130 may determine the change amount of the target peak based on the result of comparing the capacity value of the target peak TP10 with the capacity value of a predetermined reference peak.

[0056] Referring to FIG. 4, since the capacity value of the target peak TP10 is separated from the capacity value of the predetermined reference peak TP11 by about 1 to the left, the change amount of the target peak may be determined as -1.

[0057] The control unit 130 may set the usage condition of the battery based on the result of comparing the determined change amount of the target peak with a control criterion preset for the gas amount profile. For example, the control unit 130 may adjust the C-rate of the battery based on the result of comparing the change amount of the target peak with a preset control criterion. This will be described later with reference to FIG. 5.

[0058] The battery management device 100 according to an embodiment of the present invention can accurately diagnose the state of the battery by determining a target peak using a differential profile generated by measuring the battery in real time.

[0059] The battery management device 100 according to an embodiment of the present invention can accurately diagnose the state of the battery and, based on the diagnosis result, set the usage condition of the battery, thereby preventing deterioration associated with the generation of gas in the battery.

[0060] On the other hand, the profile acquisition unit 110, profile generation unit 120, and control unit 130 provided in the battery management device 100 may selectively include processors, application specific integrated circuits (ASICs), other chip sets, logic circuits, registers, communication modems, data processing devices, etc. that are known in the art in order to activate various control logics performed in the present invention. Further, when the control logic is realized by software, the profile acquisition unit 110, profile generation unit 120, and control unit 130 may be realized by a set of program modules. At this time, the program modules are stored in the memory and can be activated by the profile acquisition unit 110, profile generation unit 120, and control unit 130. The memory may exist inside or outside each of the profile acquisition unit 110, profile generation unit 120, and control unit 130, and can be connected to the profile acquisition unit 110, profile generation unit 120, and control unit 130 by various well-known means.

[0061] In addition, the battery management device 100 may further include a storage unit 140. The storage unit 140 can store data, programs, or data generated during the operation and function of each component of the battery management device 100, which are necessary for the operation and function. The storage unit 140 is not particularly limited in its type as long as it is a known information storage means capable of performing data recording, erasing, updating, and reading. As an example, the information storage means may include a random access memory (RAM), a flash memory, a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a register, etc. Further, the storage unit 140 can store program codes defining processes that can be activated by the control unit 130.

[0062] Hereinafter, the control criteria will be specifically described. The control unit 130 can compare the determined change amount of the target peak with a preset control criterion for the gas amount profile. The control criterion can be a value preset during the generation of the battery or a value preset by the user.

[0063] According to the embodiment, the control criterion may include a first control criterion and a second control criterion. This will be described in detail with reference to FIG. 5.

[0064] FIG. 5 is a diagram schematically showing a gas amount profile according to an embodiment of the present invention. FIG. 5 shows a first change amount and a second change amount, and it can be confirmed that the first control criterion is on the left side of the second control criterion.

[0065] The control unit 130 can determine whether the change amount of the target peak satisfies the first control criterion. The first control criterion may mean a criterion for determining whether the change amount of the target peak corresponds to a first change amount or less corresponding to a reference value of the preset gas generation amount from the gas amount profile. For example, in the embodiment of FIG. 5, the first change amount corresponding to the preset reference value of the gas generation amount may be -2.

[0066] The reference value of the preset gas generation amount from the gas amount profile may mean a threshold value at which control of the gas generation amount of the battery is required. Generally, when the change amount of the target peak of the battery is equal to or less than the first change amount (in other words, when the gas generation amount of the battery is equal to or more than the reference value), it may be a case where the battery is exposed to a high temperature for a relatively long time.

[0067] Therefore, when the change amount of the target peak satisfies the first control criterion, the control unit 130 can adjust the temperature and SOC of the battery and reduce the C rate. Specifically, the control unit 130 can lower the upper limits of the temperature and the state of charge (SOC) of the battery. Then, the control unit 130 can reduce the charging C rate of the battery. For example, in the embodiment of FIG. 5, when the change amount of the target peak of the battery is -2 or less, the control unit 130 can lower the upper limits of the temperature and the state of charge (SOC) of the battery and reduce the charging C rate.

[0068] As another example, the control unit 130 can determine whether the change amount of the target peak satisfies the second control criterion. The second control criterion may mean a criterion for determining whether the change amount of the target peak corresponds to or is less than a second change amount corresponding to a reference value of the loss amount of the negative electrode reaction area. For example, in the embodiment of FIG. 5, the second change amount can be -1.

[0069] The reference value of the loss amount of the negative electrode reaction area may mean a threshold value that requires control as the negative electrode deteriorates and the negative electrode reaction area is lost. Generally, the loss of the negative electrode reaction area shortens the life of the battery, which in turn increases the risk of gas generation.

[0070] Therefore, when the change amount of the target peak satisfies the second control criterion, the control unit 130 can reduce the C rate. Specifically, the control unit 130 can reduce the charging C rate of the battery. For example, in the embodiment of FIG. 5, when the change amount of the target peak of the battery is -1 or less and exceeds -2, the control unit 130 can reduce the charging C rate of the battery.

[0071] On the one hand, in one embodiment, the first change amount may be less than or equal to the second change amount. As described above, the loss of the negative electrode reaction area shortens the battery life, and thereby promotes gas generation. Therefore, the second change amount regarding the loss of the negative electrode reaction area may be even larger than the first change amount regarding the gas generation amount. That is, since gas may be generated due to the loss of the negative electrode reaction area, the second change amount may be even larger than the first change amount.

[0072] In this case, the control unit 130 may set the operating conditions of the battery so as to be able to diagnose battery abnormalities regarding the loss of the negative electrode reaction area and the gas generation amount step by step. Since the operating conditions of the battery are set step by step, serious deterioration of the battery can be prevented, and accidents such as unexpected fires and explosions can be prevented.

[0073] The battery management device 100 according to the present invention is applicable to a battery management system (BMS: Battery Management System). That is, the BMS according to the present invention may include the battery management device 100 described above. In such a configuration, at least a part of each component of the battery management device 100 may be realized by complementing or adding functions of components included in the conventional BMS. For example, the profile acquisition unit 110, the profile generation unit 120, the control unit 130, and the storage unit 140 of the battery management device 100 may be realized as components of the BMS.

[0074] In addition, the battery management device 100 according to the present invention may be provided in the battery pack 1. That is, the battery pack 1 according to the present invention may include the battery management device 100 described above and one or more batteries. Further, the battery pack 1 may further include electrical components (such as relays and fuses) and a case.

[0075] FIG. 6 is a diagram schematically showing an exemplary configuration of the battery pack 1 according to another embodiment of the present invention.

[0076] The positive electrode terminal of the battery B can be connected to the positive electrode terminal P+ of the battery pack 1, and the negative electrode terminal of the battery B can be connected to the negative electrode terminal P- of the battery pack 1.

[0077] The measurement unit 200 can be connected to the first sensing line SL1, the second sensing line SL2, and the third sensing line SL3. Specifically, the measurement unit 200 can be connected to the positive electrode terminal of the battery B via the first sensing line SL1, and can be connected to the negative electrode terminal of the battery B via the second sensing line SL2. The measurement unit 200 can measure the voltage of the battery B based on the voltages measured in the first sensing line SL1 and the second sensing line SL2 respectively.

[0078] And the measurement unit 200 can be connected to the current measurement unit A via the third sensing line SL3. For example, the current measurement unit A can be an ammeter or a shunt resistor capable of measuring the charging current and the discharging current of the battery B. The measurement unit 200 can measure the charging current of the battery B via the third sensing line SL3 and calculate the charging amount. Also, the measurement unit 200 can measure the discharging current of the battery B via the third sensing line SL3 and calculate the discharging amount.

[0079] One end of the charge and discharge device can be connected to the positive electrode terminal P+ of the battery pack 1, and the other end can be connected to the negative electrode terminal P- of the battery pack 1. Therefore, the positive electrode terminal of the battery B, the positive electrode terminal P+ of the battery pack 1, the charge and discharge unit 300, the negative electrode terminal P- of the battery pack 1, and the negative electrode terminal of the battery B can be electrically connected.

[0080] FIG. 7 is a diagram schematically showing a battery management method according to still another embodiment of the present invention.

[0081] Preferably, each step of the battery management method can be performed by the battery management device 100. Hereinafter, the contents overlapping with those described above will be omitted or briefly described. The gas amount profile acquisition step (S110) is a step of acquiring a gas amount profile indicating the correspondence between the gas generation amount of the battery and the change amount of the peak, and can be performed by the profile acquisition unit 110.

[0082] For example, the profile acquisition unit 110 can directly receive a gas amount profile from the outside. The gas amount profile may mean a differential profile for a plurality of batteries having different temperatures at a specific SOC and a gas generation amount of the plurality of batteries.

[0083] According to the embodiment, the gas amount profile can be configured to show the correlation between the change amount of the peak determined from the differential profiles for a plurality of batteries and the corresponding gas generation amount.

[0084] Specifically, the gas amount profile can be configured to show the correlation between the gas generation amounts corresponding to the change amounts of the peaks determined from the differential profiles for a plurality of batteries measured at different temperatures.

[0085] The differential profile generation step (S120) is a step of generating a differential profile for a battery profile indicating the correspondence between the capacity of the battery and the differential voltage, and can be performed by the profile generation unit 120.

[0086] For example, the profile generation unit 120 can generate a differential profile for a battery profile indicating the correspondence between the capacity of the battery and the differential voltage.

[0087] Here, the differential profile may mean a differential voltage profile indicating the correspondence between the capacity (Q) of the battery and the differential voltage (dV / dQ). Here, the capacity (Q) and the differential voltage (dV / dQ) of the battery can be relative values. For example, the capacity (Q) and the differential voltage (dV / dQ) of the battery can be normalized values.

[0088] The target peak change amount determination step (S130) is a step of determining the change amount of the target peak from the differential profile generated in the profile generation step (S120), and can be performed by the control unit 130.

[0089] For example, the control unit 130 can determine the target peak from the differential profile received from the profile generation unit 120. Specifically, the control unit 130 can determine any one of the peaks of the differential profile as the target peak. For example, the control unit 130 can determine Ta(6) included in the differential profile as the target peak.

[0090] The control unit 130 can determine the change amount of the target peak based on the result of comparing the capacity value of the predetermined reference peak with the capacity value of the target peak.

[0091] The usage condition setting step (S140) is a step of setting the usage condition of the battery based on the result of comparing the determined change amount of the target peak with a control criterion preset for the gas amount profile, and can be performed by the control unit 130.

[0092] For example, based on the comparison result between the change amount of the target peak and the control criterion preset for the gas amount profile, the C-rate of the battery can be adjusted.

[0093] The control criterion can be a value preset during the production of the battery, or a value preset by the user. Depending on the embodiment, the control criterion can include a first control criterion and a second control criterion.

[0094] For example, the control unit 130 can determine whether the change amount of the target peak satisfies a first control criterion. The first control criterion may mean a criterion for determining whether the change amount of the target peak is equal to or less than a first change amount corresponding to a reference value of the gas generation amount preset from the gas amount profile. When the change amount of the target peak satisfies the first control criterion, the control unit 130 can adjust the temperature and SOC of the battery and reduce the C rate.

[0095] As another example, the control unit 130 can determine whether the change amount of the target peak satisfies a second control criterion. The second control criterion may mean a criterion for determining whether the change amount of the target peak is equal to or less than a second change amount corresponding to a reference value of the loss amount of the negative electrode reaction area. When the change amount of the target peak satisfies the second control criterion, the control unit 130 can reduce the C rate.

[0096] The control unit 130 can set the operating conditions of the battery so as to gradually diagnose battery abnormalities regarding the loss of the negative electrode reaction area and the gas generation amount. Since the operating conditions of the battery are set step by step, serious deterioration of the battery can be prevented, and accidents such as unexpected fires and explosions can be prevented.

[0097] The embodiments of the present invention described above are not only realized by the device and method, but may also be realized via a program that realizes the functions corresponding to the configurations of the embodiments of the present invention or a recording medium on which the program is recorded. Such realization can be easily achieved by those skilled in the technical field to which the present invention pertains from the description of the above-described embodiments.

[0098] As described above, the present invention has been described with reference to the limited embodiments and drawings. However, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made within the equivalent scope of the technical idea and claims of the present invention by those having ordinary knowledge in the technical field to which the present invention pertains.

[0099] In addition, the present invention described above can be variously substituted, modified, and changed by those having ordinary knowledge in the technical field to which the present invention pertains, without departing from the technical idea of the present invention. Therefore, it is not limited by the above-described embodiments and the attached drawings, and all or part of each embodiment can be selectively combined and configured for various modifications.

Explanation of Reference Numerals

[0100] 1: Battery pack 100: Battery management device 110: Profile acquisition unit 120: Profile generation unit 130: Control unit 140: Storage unit 200: Measurement unit 300: Charge and discharge unit

Claims

1. A profile acquisition unit configured to acquire a gas amount profile indicating a correspondence relationship between a gas generation amount of a battery and a change amount of a peak; A profile generation unit configured to generate a differential profile for a battery profile indicating a correspondence relationship between the capacity of the battery and the differential voltage; A control unit configured to determine a change amount of a target peak from the differential profile received from the profile generation unit, and set a usage condition of the battery based on a result of comparing the determined change amount of the target peak with a control criterion preset for the gas amount profile; A battery management device including the above.

2. The control unit is: configured to determine a target peak from the differential profile, and determine the change amount of the target peak based on a result of comparing a capacity value of a reference peak preset with the capacity value of the target peak. The battery management device according to claim 1.

3. The control criterion is: A first control criterion for determining whether or not the change amount of the target peak corresponds to or is less than a first change amount corresponding to a reference value of a gas generation amount preset from the gas amount profile; A second control criterion for determining whether or not the change amount of the target peak corresponds to or is less than a second change amount corresponding to a reference value of a loss amount of a negative electrode reaction area; The battery management device according to claim 1, configured to include the above.

4. The control unit is: configured to adjust the temperature and state of charge (SOC) of the battery and decrease the C rate when the change amount of the target peak satisfies the first control criterion. The battery management device according to claim 3.

5. The control unit is: configured to decrease the C rate when the change amount of the target peak satisfies the second control criterion. The battery management device according to claim 3.

6. The first change amount is less than or equal to the second change amount. The battery management device according to claim 3.

7. The gas amount profile is: Generated based on differential profiles for a plurality of batteries having different temperatures at a specific state of charge (SOC) and the gas generation amounts of the plurality of batteries. The battery management device according to claim 1.

8. The gas amount profile is: The battery management device according to claim 7, configured to show the correlation between the amount of change in the peak determined from the differential profile for the plurality of batteries and the corresponding gas generation amount.

9. A battery pack including the battery management device according to any one of claims 1 to 8.

10. A gas amount profile acquisition step of acquiring a gas amount profile showing the correspondence between the gas generation amount of the battery and the amount of change in the peak; A differential profile generation step of generating a differential profile for a battery profile showing the correspondence between the capacity of the battery and the differential voltage; A target peak change amount determination step of determining the amount of change in the target peak from the differential profile generated in the differential profile generation step; A use condition setting step of setting the use conditions of the battery based on the result of comparing the determined amount of change in the target peak with a preset control criterion for the gas amount profile; A battery management method including the above steps.

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