Apparatus and method for managing battery

Abstract

A battery management device according to one embodiment of the present disclosure may include an SOH calculation unit that calculates the SOH of each of a plurality of battery cells, and a balancing target determination unit that selects a battery cell as a second battery cell in which the difference value of SOC with the first battery cell having the lowest SOC among the plurality of battery cells is greater than or equal to a reference value, and determines a balancing target by comparing the SOH of the first battery cell with the SOH of the second battery cell.

Description

Technology Field

[0001] The present disclosure relates to a battery management device and method, and more specifically, to a battery management device and method capable of determining whether to perform balancing of battery cells by considering the degree of degradation of battery cells. Background Technology

[0002] Recently, active research and development on secondary batteries has been underway. Here, the term "secondary battery" refers to a rechargeable battery, encompassing conventional Ni / Cd and Ni / MH batteries as well as the more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of significantly higher energy density compared to conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight manner, making them suitable for use as power sources for mobile devices. Additionally, as their scope of application expands to include power sources for electric vehicles, lithium-ion batteries are garnering attention as a next-generation energy storage medium.

[0003] In addition, secondary batteries are generally used as battery packs comprising battery modules in which multiple battery cells are connected in series and / or parallel. The state and operation of the battery pack are managed and controlled by a battery management system.

[0004] In the case of Energy Storage Systems (ESS) and electric vehicles using large-capacity batteries containing these battery cells, balancing the battery cells is very important because a large number of battery cells are installed. In particular, in the case of Energy Storage Systems containing large-capacity batteries, there may be instances where some batteries are replaced through warranty service.

[0005] However, in such cases, indiscriminate balancing occurs regardless of the degree of battery degradation, so not only is the desired balancing effect not achieved, but the battery's lifespan may also be deteriorated as the battery is continuously discharged through balancing. The problem to be solved

[0006] The present disclosure aims to provide a battery management device and method that can perform balancing more efficiently and manage batteries safely by determining whether to perform balancing by considering the degradation degree of each battery cell when selecting a battery cell to be balanced.

[0007] The technical problems of the present disclosure are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] A battery management device according to one embodiment of the present disclosure may include an SOH calculation unit that calculates the SOH of each of a plurality of battery cells, and a balancing target determination unit that selects a battery cell as a second battery cell in which the difference value of SOC with the first battery cell having the lowest SOC among the plurality of battery cells is greater than or equal to a reference value, and determines a balancing target by comparing the SOH of the first battery cell with the SOH of the second battery cell.

[0009] The balancing target determination unit of the battery management device according to one embodiment of the present disclosure can determine the second battery cell as the balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell.

[0010] A battery management device according to one embodiment of the present disclosure may further include a balancing control unit that performs balancing on a battery cell determined to be a balancing target.

[0011] The balancing control unit of the battery management device according to one embodiment of the present disclosure can perform balancing when the SOC of the second battery cell is included in a preset range.

[0012] The balancing control unit of the battery management device according to one embodiment of the present disclosure may perform balancing based on one of a first section in which the SOC of the second battery cell is greater than or equal to a first reference value, or a second section in which the SOC of the battery cell is less than or equal to a second reference value that is smaller than the first reference value.

[0013] A battery management device according to one embodiment of the present disclosure may further include a replacement target determination unit that determines a battery cell to be replaced based on the deviation of SOC among the plurality of battery cells in the remaining section, excluding the section in which balancing for the battery cell is performed among the first section or the second section.

[0014] The replacement target determination unit of the battery management device according to one embodiment of the present disclosure can determine a battery cell as a replacement target battery cell if the deviation in SOC from any cell among the plurality of battery cells is greater than or equal to a reference value.

[0015] In the case where the balancing control unit of the battery management device according to one embodiment of the present disclosure can perform balancing for both the first section and the second section, it can perform balancing preferentially for the first section.

[0016] The reference value of the battery management device according to one embodiment of the present disclosure may be set based on the specifications of the battery cell and the battery management system managing the battery cell.

[0017] A battery management method according to one embodiment of the present disclosure may include the steps of: calculating the SOH of each of a plurality of battery cells; selecting a battery cell as a second battery cell in which the difference in SOC with the first battery cell having the lowest SOC among the plurality of battery cells is greater than or equal to a reference value; and determining a balancing target by comparing the SOH of the first battery cell with the SOH of the second battery cell.

[0018] The step of determining the balancing target of the battery management method according to one embodiment of the present disclosure may determine the second battery cell as the balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell. Effects of the invention

[0019] According to the battery management device and method of the present disclosure, when selecting a battery cell to be balanced, balancing can be performed more efficiently and the battery can be managed safely by determining whether to balance based on the degradation degree of each battery cell. Brief explanation of the drawing

[0020] Figure 1 is a block diagram showing the configuration of a typical battery rack. FIG. 2 is a block diagram showing the configuration of a battery management device according to one embodiment of the present disclosure. Figure 3 is a diagram exemplifying the SOC behavior during charging and discharging of a conventional battery cell. FIGS. 4 to 7 are drawings exemplarily illustrating balancing performed through a battery management device according to one embodiment of the present disclosure. FIG. 8 is a flowchart illustrating a battery management method according to one embodiment of the present disclosure. FIG. 9 is a block diagram showing a computing system that executes a battery management method according to one embodiment of the present invention. Specific details for implementing the invention

[0021] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings. In this document, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0022] With respect to the various embodiments of the present disclosure disclosed in this document, specific structural or functional descriptions are provided merely for the purpose of explaining the embodiments of the present disclosure, and the various embodiments of the present disclosure may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this document.

[0023] Expressions such as "first," "second," "first," or "second" used in various embodiments may modify various components regardless of order and / or importance and do not limit said components. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be renamed the first component.

[0024] The terms used in this document are used merely to describe specific embodiments and are not intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0025] All terms used herein, including technical or scientific terms, may have the same meaning as generally understood by those skilled in the art of the present disclosure. Terms defined in commonly used dictionaries may be interpreted as having the same or similar meaning as they have in the context of the relevant technology and are not to be interpreted in an ideal or overly formal sense unless explicitly defined in this document. In some cases, even terms defined in this document shall not be interpreted to exclude embodiments of the present disclosure.

[0026] Figure 1 is a block diagram showing the configuration of a typical battery rack.

[0027] Referring to FIG. 1, a battery control system including a battery rack (1) and an upper controller (2) included in an upper system according to one embodiment of the present disclosure is schematically shown.

[0028] As illustrated in FIG. 1, the battery rack (1) comprises a plurality of battery modules (10) capable of charging and discharging, each composed of one or more battery cells; a switching unit (14) connected in series to the (+) terminal side or the (-) terminal side of the plurality of battery modules (10) to control the charging and discharging current flow of the battery modules (10); a battery protection unit (16) that performs current cutoff, charging and discharging mode switching, etc., for the protection of the battery rack (1); and a battery management system (100) (e.g., RBMS) that monitors the voltage, current, temperature, etc. of the battery rack (1) and controls and manages to prevent overcharging and over-discharging. At this time, the battery rack (1) may be equipped with a battery module (10), a sensor (12), a switching unit (14), and a battery management system (100).

[0029] Here, the switching unit (14) is a device for controlling the current flow for charging or discharging a plurality of battery modules (10), and, for example, depending on the specifications of the battery rack (1), at least one relay, magnetic contactor, etc. may be used.

[0030] A battery protection unit (not shown) includes a relay and a fuse, and can protect the battery rack (10) by controlling the relay on / off according to a control signal of the battery management system (100) to cut off the current. In addition, the battery protection unit can cut off the current applied to the battery rack (1) by melting the fuse when an abnormal current or abnormal voltage occurs.

[0031] The battery management system (100) is an interface that receives values ​​of various parameters measured above, and may include a plurality of terminals and a circuit connected to these terminals to perform processing of the received values. Additionally, the battery management system (100) may control the ON / OFF of a switching unit (14), such as a relay or contactor, and may be connected to a battery module (10) to monitor the status of each battery module (10).

[0032] The upper controller (2) can transmit a control signal for the battery module (10) to the battery management system (100). Accordingly, the operation of the battery management system (100) may be controlled based on the signal applied from the upper controller (2). Meanwhile, the battery cell of the present disclosure may be a component included in the battery module (10) used in an Energy Storage System (ESS). In such a case, the upper controller (2) may be a controller (BBMS) for a battery bank including a plurality of racks or an ESS controller that controls the entire ESS including a plurality of banks. However, the battery rack (1) is not limited to such uses.

[0033] In particular, the battery management system (100) includes a battery management device described below, and can select targets for battery cell balancing by considering the degradation degree of each battery cell. That is, the battery management system (100) of FIG. 1 can perform the functions of the SOH calculation unit (110), balancing target determination unit (120), balancing control unit (130), and replacement target determination unit (140) of FIG. 2.

[0034] Since the configuration of the battery rack (1) and the battery management system (100) are known configurations, a more detailed description will be omitted.

[0035] FIG. 2 is a block diagram showing the configuration of a battery management device according to one embodiment of the present disclosure.

[0036] Referring to FIG. 2, a battery management device (100) according to one embodiment of the present disclosure may include a state of health (SOH) calculation unit (110), a balancing target determination unit (120), a balancing control unit (130), and a replacement target determination unit (140).

[0037] The SOH calculation unit (110) can calculate the SOH of each of the plurality of battery cells. For example, the SOH calculation unit (110) can calculate the SOH based on the state of charge (SOC) of each of the plurality of battery cells. In addition, the SOH calculation unit (110) can calculate the SOH based on various state values ​​such as the battery voltage, internal resistance, and number of charge / discharge cycles.

[0038] The balancing target determination unit (120) can select a battery cell (second battery cell) whose difference in SOC from the battery cell with the lowest SOC (first battery cell) among a plurality of battery cells is greater than or equal to a reference value, and can determine the battery cell to be balanced by comparing the SOH of the first battery cell and the SOH of the second battery cell. For example, the reference value may be set based on the specifications of the battery cell and the battery management system that manages the battery cell.

[0039] Specifically, the balancing target determination unit (120) can determine the second battery cell as a balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell. That is, the balancing target determination unit (120) determines the second battery cell as a primary balancing target when the difference value of SOC with the first battery cell, which has the lowest SOC among the plurality of battery cells, is greater than or equal to a reference value, and then selects the second battery cell as a final balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell.

[0040] In this way, the balancing target determination unit (120) can determine a balancing target when it satisfies the following mathematical formula 1.

[0042] [Mathematical Formula 1]

[0043] SOH Min Cell - SOH Each Cell[n] ≥ 0 (battery cells of n = 1, 2, 3, ⪋, N)

[0045] Here, SOH Min Cell is the SOH value of the battery cell with the lowest SOC (the first battery cell), and SOH Each Cell[n] is the SOH value of a battery cell (second battery cell) whose difference in SOC from the first battery cell is greater than or equal to the reference value.

[0047] The balancing control unit (130) can perform balancing on a battery cell determined to be a balancing target by the balancing target determination unit (120). For example, the balancing control unit (130) can perform balancing when the SOC of the second battery cell is included in a preset section. In this case, the balancing control unit (130) can perform balancing based on one of the sections: a first section where the SOC of the second battery cell is greater than or equal to a first reference value (e.g., SOC upper section, charging end state) or a second section where the SOC of the battery cell is less than or equal to a second reference value (e.g., SOC lower section, discharging end state).

[0048] At this time, if balancing can be performed for both the first section and the second section, the balancing control unit (130) may perform balancing preferentially for the first section, that is, the section where the SOC is at the top. This is because performing balancing based on the section where the battery cell's SOC is at the top can minimize battery degradation and prevent overcharging of the battery.

[0049] The replacement target determination unit (140) can determine a battery cell to be replaced based on the deviation of SOC between multiple battery cells in the remaining section, excluding the section in which balancing for the battery cell is performed in the first section or the second section. In this case, the replacement target determination unit (140) can determine a battery cell to be replaced if the deviation of SOC with any cell among the multiple battery cells is greater than or equal to a reference value (e.g., 15%). For example, any cell among the multiple battery cells may be any one of the multiple battery cells.

[0050] A battery management device (100) according to one embodiment of the present disclosure can prevent indiscriminate balancing as in the past through this configuration. That is, in the battery management device (100) according to one embodiment of the present disclosure, instead of converging all battery cells to one point at the top or bottom of the SOC, a maximum deviation is generated at the opposite point, thereby enabling the detection of battery cells that have degraded relatively quickly through deviation diagnosis.

[0051] In this way, according to a battery management device according to one embodiment of the present disclosure, when selecting a battery cell to be balanced, balancing can be performed more efficiently and the battery can be managed safely by determining whether to balance based on the degradation degree of each battery cell.

[0052] Figure 3 is a diagram exemplifying the SOC behavior during charging and discharging of a conventional battery cell.

[0053] In the graph of Figure 3, the horizontal axis represents the state of the battery cell, and the vertical axis represents the State of Charge (SOC). For example, when a battery cell is being charged, it may be in a charging end state (first section), and when it is being discharged, it may be in a discharging end state (second section). As another example, series-connected battery cells with different SOHs may have different SOCs when charging or discharging ends, because charging ends when one battery cell is fully charged and discharging ends when one battery cell is fully discharged.

[0054] Since the SOH of a battery decreases in proportion to the decrease in capacity, the change in SOC during charging or discharging is more gradual when the battery's SOH is high compared to when it is low. For example, if the SOH of a 100Ah battery cell becomes 50%, the battery cell eventually has a capacity of 50Ah, which means that when charging and discharging with the same current as when the SOH is 100, the slope of the change in SOC from 0% to 100% relative to the original has doubled.

[0055] That is, as shown in Figure 3, it can be seen that the slope is gentler when the SOH is 100 compared to when the SOH is 80. In the case of such a conventional battery cell, in the upper SOC section (e.g., section 1), the battery cell with SOH 80 is balanced based on the battery cell with SOH 100, whereas in the lower SOC section (e.g., section 2), the battery cell with SOH 100 is balanced based on SOH 80.

[0056] As such, conventionally, balancing is performed without considering the SOH of each battery cell, so the battery cells being balanced at the upper (first section) or lower (second section) of the SOC may be opposite to each other, so not only is a substantial balancing effect not obtained, but the battery cells may discharge due to balancing, which can lead to accelerated degradation of the battery module or the entire pack.

[0057] FIGS. 4 to 7 are drawings illustrating balancing performed through a battery management device according to one embodiment of the present disclosure.

[0058] Similar to Fig. 3, the graphs in Figs. 4 to 7 show that the horizontal axis represents the state of the battery cell and the vertical axis represents the state of charge (SOC). Also, as with Fig. 3, it can be seen that the slope of Figs. 4 to 7 becomes gentler as the SOH increases to 80, 90, and 100.

[0059] First, referring to Figure 4, it can be seen that in the upper section where the SOC is high (e.g., the first section, the charging end state), the SOC decreases in the order of SOH 80, 90, and 100, and in the lower section where the SOC is low (e.g., the second section, the discharging end state), conversely, the SOC decreases in the order of SOH 100, 90, and 80.

[0060] As shown in FIG. 4, in this case, according to the battery management device according to the present disclosure, it can be seen that in the upper section of the SOC (first section) where the battery cell with the lowest SOC (i.e., the battery cell with SOH 100) has a higher SOH than other battery cells, balancing is performed based on the battery cell with SOH 100.

[0061] Meanwhile, referring to Fig. 4, it can be seen that in the lower SOC section (section 2), the SOC deviation between battery cells has increased compared to before due to balancing in the upper SOC section (section 1). In this case, through deviation diagnosis, batteries with a large difference in SOC between battery cells—that is, batteries that have undergone relatively severe degradation—can be replaced, thereby ensuring safe battery management.

[0062] In addition, referring to Figure 5, it can be seen that in the upper section of the SOC (Section 1), the SOC decreases in the order of SOH 100, 80, and 90, and in the lower section of the SOC (Section 2), the SOC decreases in the order of SOH 100, 90, and 80.

[0063] In this case as well, in the same manner as in Fig. 4, in the upper section of the SOC (the first section), balancing can be performed on the SOH 80 battery cell based on the SOH 90 battery cell with the lowest SOC. Meanwhile, in the case of the SOH 100 battery cell, balancing is not performed because its SOH is higher than that of the SOH 80 and 90 battery cells.

[0064] On the other hand, referring to Fig. 5, it can be seen that in the lower SOC section (section 2), the SOC deviation between battery cells has increased compared to before due to balancing in the upper SOC section (section 1). In this case, similar to Fig. 4, batteries can be safely managed by replacing batteries with a large difference in SOC between battery cells—that is, batteries that have undergone relatively severe degradation—through deviation diagnosis.

[0065] Also, referring to FIG. 6, it can be seen that in both the upper section of the SOC (first section) and the lower section of the SOC (second section), the SOC decreases in the order of SOH 80, 90, and 100. In this case, according to the operation method of the battery management device of the present disclosure, balancing can be performed based on a battery cell with SOH 100 in both the upper section of the SOC (first section) and the lower section of the SOC (second section).

[0066] At this time, as shown in Fig. 6, balancing can be performed based on the lower SOC section (second section), where the SOC difference between SOH 80, 90, and 100 battery cells is relatively small. This is to ensure that deviation diagnosis is performed based on the upper SOC section (first section), as the SOC difference between battery cells is already significant in the upper SOC section (first section). By performing deviation diagnosis on the upper SOC section (first section) in this way, battery cells that have undergone severe degradation and have a large SOC difference can be replaced.

[0067] In addition, referring to Fig. 7, it can be seen that in the upper section of the SOC (Section 1), the SOC decreases in the order of SOH 80, 90, and 100, and in the lower section of the SOC (Section 2), the SOC decreases in the order of SOH 80, 100, and 90.

[0068] In this case as well, in the same manner as in the previous case, in the upper SOC section (Section 1), balancing can be performed for SOH 80 and SOH 90 battery cells based on the SOH 100 battery cell with the lowest SOC. Meanwhile, in the lower SOC section (Section 2), balancing can be performed for the SOH 80 battery cell based on the SOC 100 battery cell.

[0069] At this time, as shown in Fig. 7, it can be seen that balancing is performed based on the upper section of the SOC (Section 1). This is because performing balancing based on the upper section of the battery cell's SOC (Section 1) can minimize battery degradation and prevent overcharging of the battery. In addition, regarding the lower section of the SOC (Section 2), batteries with a large difference in SOC between battery cells can be replaced through deviation diagnosis.

[0070] A battery management device (100) according to one embodiment disclosed in this document can determine a battery to be replaced based on the result of diagnosing deviations based on the difference in SOH of each battery cell and the SOC of each battery cell after cell balancing.

[0071] FIG. 8 is a flowchart illustrating a battery management method according to one embodiment of the present disclosure.

[0072] Referring to FIG. 8, a battery management method according to one embodiment of the present disclosure can first calculate the SOH of each of a plurality of battery cells (S110). For example, in step S110, the SOH can be calculated based on various state values ​​such as the SOC, voltage, internal resistance, and number of charge / discharge cycles of each of the plurality of battery cells.

[0073] Additionally, among the multiple battery cells, a battery cell whose difference in SOC from the first battery cell with the lowest SOC is greater than or equal to a reference value is selected as the second battery cell (S120). At this time, the reference value may be set based on the specifications of the battery cell and the battery management system that manages the battery cell.

[0074] Then, it is determined whether the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell (S130). If the SOH of the first battery cell is less than the SOH of the second battery cell (NO), the second battery cell is excluded from the balancing target.

[0075] On the other hand, if the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell (YES), the second battery cell is determined to be a battery cell to be balanced (S140). Thus, in steps S120 to S140, the second battery cell, which has a difference in SOC from the first battery cell with the lowest SOC among the plurality of battery cells, is determined to be a primary balancing target, and if the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell, the second battery cell can be determined to be a final balancing target.

[0076] Next, balancing is performed on the battery cell determined to be the balancing target (S150). For example, in step S150, balancing can be performed when the SOC of the second battery cell falls within a preset interval. In this case, balancing can be performed based on one of the intervals: a first interval where the SOC of the second battery cell is greater than or equal to a first reference value (e.g., SOC upper interval, charging end state) or a second interval where the SOC of the battery cell is less than or equal to a second reference value (e.g., SOC lower interval, discharging end state).

[0077] If balancing can be performed for both the first and second sections, in step S150, balancing can be performed preferentially for the first section, that is, the section where the SOC is at the top. This is because performing balancing based on the section where the battery cell's SOC is at the top can minimize battery degradation and prevent overcharging of the battery.

[0078] Meanwhile, although not shown in FIG. 8, a battery management method according to one embodiment of the present disclosure may further include a step of determining a battery cell to be replaced based on the deviation of SOC among a plurality of battery cells for the remaining section excluding the section in which balancing for the battery cell is performed among the first or second sections described above. In this case, a battery cell whose deviation of SOC from any cell among the plurality of battery cells is greater than or equal to a reference value (e.g., 15%) may be determined as a battery cell to be replaced. For example, any cell among the plurality of battery cells may be any one of the cells among the plurality of battery cells.

[0079] In this way, according to the battery management method of one embodiment of the present disclosure, when selecting a battery cell to be balanced, balancing can be performed more efficiently and the battery can be managed safely by determining whether to balance based on the degradation degree of each battery cell.

[0080] FIG. 9 is a block diagram showing a computing system that executes a battery management method according to one embodiment of the present invention.

[0081] Referring to FIG. 9, a computing system (30) according to one embodiment of the present invention may include an MCU (32), a memory (34), an input / output I / F (36), and a communication I / F (38).

[0082] The MCU (32) may be a processor that executes various programs stored in memory (34) (e.g., SOH calculation program, balancing target determination program, etc.), processes various data including SOC, SOH, etc. of battery cells through these programs, and performs the functions of the battery management device shown in FIG. 2 above.

[0083] The memory (34) can store various programs regarding the calculation of the battery cell's SOH and the determination of the balancing target. Additionally, the memory (720) can store various data such as the SOC and SOH data of each battery cell.

[0084] These memories (34) may be provided in multiple quantities as needed. The memories (34) may be volatile memories or non-volatile memories. As volatile memories, the memory (34) may use RAM, DRAM, SRAM, etc. As non-volatile memories, the memory (34) may use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the memories (34) listed above are merely examples and are not limited to these examples.

[0085] The input / output I / F (36) can provide an interface that enables data transmission and reception between an input device (not shown), such as a keyboard, mouse, or touch panel, and an output device (not shown), such as a display, and the MCU (32).

[0086] The communication I / F (340) is configured to transmit and receive various data to and from a server and may be various devices capable of supporting wired or wireless communication. For example, through the communication I / F (38), programs for calculating the SOH of a battery cell or determining a balancing target, or various data, can be transmitted and received from an external server provided separately.

[0087] In this way, a computer program according to one embodiment of the present disclosure may be implemented as a module that performs, for example, the functions illustrated in FIG. 2, by being recorded in memory (34) and processed by an MCU (32).

[0088] In the foregoing, although all components constituting the embodiments of the present disclosure have been described as being combined or operating together, the present disclosure is not necessarily limited to such embodiments. That is, within the scope of the purpose of the present disclosure, all components may be selectively combined and operated in one or more ways.

[0089] Furthermore, terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this disclosure pertains, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and, unless explicitly defined in this disclosure, should not be interpreted in an ideal or overly formal sense.

[0090] The foregoing description is merely an illustrative explanation of the technical concept of the present disclosure, and those skilled in the art to which the present disclosure pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are intended to explain, not limit, the technical concept of the present disclosure, and the scope of the technical concept of the present disclosure is not limited by such embodiments. The scope of protection of the present disclosure shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present disclosure. Explanation of the symbols

[0091] 1: Battery Rack 2: Parent Controller 10: Multiple battery modules 12: Sensor 14: Switching section 30: Computing system 32: MCU 34: Memory 36: Input / Output I / F 38: Communication I / F 100: Battery Management System (BMS) 110: SOH Calculation Unit 120: Balancing target determination unit 130: Balancing control unit 140: Replacement Target Determination Unit

Claims

Claim 1 A battery management device comprising: a SOH calculation unit for calculating the SOH (state of health) of each of a plurality of battery cells; a balancing control unit for identifying a first section indicating a charging end state of the plurality of battery cells and a second section indicating a discharging end state of the plurality of battery cells, and identifying at least one section among the first section and the second section where balancing is to be performed based on the SOC deviation between the plurality of battery cells; and a balancing target determination unit for determining the second battery cell as a final balancing target by comparing the SOH of the first battery cell with the SOH of the second battery cell, wherein, in at least one of the first section and the second section, the difference value of SOC with the first battery cell having the lowest SOC among the plurality of battery cells is greater than or equal to a reference value, and then determining the second battery cell as a final balancing target. The balancing control unit performs balancing on the second battery cell determined as the final balancing target. Claim 2 A battery management device according to claim 1, wherein the balancing target determination unit determines the second battery cell as the balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell. Claim 3 delete Claim 4 delete Claim 5 A battery management device according to claim 1, wherein the balancing control unit performs balancing based on one of a first section in which the SOC of the second battery cell is greater than or equal to a first reference value, or a second section in which the SOC of the battery cell is less than or equal to a second reference value that is smaller than the first reference value. Claim 6 A battery management device according to claim 5, further comprising a replacement target determination unit that determines a battery cell to be replaced based on the deviation of SOC among the plurality of battery cells in the remaining section excluding the section in which balancing for the battery cell is performed among the first section or the second section. Claim 7 A battery management device according to claim 6, wherein the replacement target determination unit determines a battery cell as a replacement target battery cell if the deviation in SOC with any cell among the plurality of battery cells is greater than or equal to a reference value. Claim 8 A battery management device according to claim 5, wherein the balancing control unit performs balancing preferentially for the first section when balancing can be performed for both the first section and the second section. Claim 9 A battery management device according to claim 1, wherein the reference value is set based on the specifications of the battery cell and the battery management system managing the battery cell. Claim 10 A battery management method comprising: a step in which an SOH calculation unit calculates the SOH of each of a plurality of battery cells; a step in which a balancing control unit identifies a first section indicating a charging end state of the plurality of battery cells and a second section indicating a discharging end state of the plurality of battery cells, and identifies at least one section among the first section and the second section where balancing is to be performed based on the SOC deviation between the plurality of battery cells; a step in which a balancing target determination unit, in at least one of the first section and the second section, selects a second battery cell as a primary balancing target in which the difference value of SOC with the first battery cell having the lowest SOC among the plurality of battery cells is greater than or equal to a reference value, and then determines the second battery cell as a final balancing target by comparing the SOH of the first battery cell with the SOH of the second battery cell; and a step in which the balancing control unit performs balancing on the second battery cell determined as the final balancing target. Claim 11 A battery management method according to claim 10, wherein the step of determining a balancing target comprises the balancing target determination unit determining the second battery cell as the balancing target when the SOH of the first battery cell is greater than or equal to the SOH of the second battery cell.

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