Apparatus and method for managing battery

Abstract

An apparatus for managing a battery, according to an embodiment of the present invention, comprises: a charging unit electrically connected to a battery and configured to charge the battery; and a control unit configured to set a target capacity on the basis of the battery capacity and a preset reference capacity for the battery, compare the target capacity with the amount of charge after a charging termination voltage of the battery, and transmit a charging command to the charging unit on the basis of the result of the comparison.

Description

Battery management device and method

[0001] This application claims priority to Korean Patent Application No. 10-2024-0014382, filed on January 30, 2024, the entire contents of which are disclosed in the specification and drawings of the said application are incorporated herein by reference.

[0002] The present invention relates to a battery management device and method, and more particularly, to a battery management device and method capable of increasing the lifespan of a battery.

[0003] Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has rapidly increased, and the development of electric vehicles, energy storage batteries, robots, and satellites has been in full swing, research into high-performance batteries capable of repeated charging and discharging is actively being conducted.

[0004] Currently commercialized batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium batteries. Among these, lithium batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based batteries.

[0005] However, lithium plating, where lithium is deposited on the negative electrode surface of a battery, can cause side reactions with the electrolyte and alter the battery's kinetic balance, leading to battery degradation. When a battery deteriorates due to lithium plating, its usable capacity is reduced, potentially shortening its lifespan. Furthermore, if a battery with lithium plating is operated under the same conditions, its degradation can be further accelerated.

[0006] The present invention has been devised to solve the above problems, and its purpose is to provide a battery management device and method capable of increasing the lifespan of a battery in which lithium plating has occurred.

[0007] Other objects and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0008] A battery management device according to one aspect of the present invention may include a charging unit electrically connected to a battery and configured to charge the battery; and a control unit configured to set a target capacity based on a battery capacity of the battery and a preset reference capacity, compare the target capacity with a charge capacity after a charge termination voltage of the battery, and transmit a charge command to the charging unit based on a comparison result.

[0009] The control unit may be configured to calculate a capacity difference between the reference capacity and the battery capacity, and set the target capacity based on the calculated capacity difference.

[0010] The above control unit may be configured to set the target capacity to a value less than or equal to the capacity difference.

[0011] The control unit may be configured to compare a preset threshold capacity with the capacity difference for a voltage section after the charge termination voltage of the battery, and set the target capacity to a lower value between the threshold capacity and the capacity difference.

[0012] The control unit may be configured to transmit the charging command to the charging unit until the charging capacity reaches the target capacity.

[0013] A battery management device according to another aspect of the present invention may further include a measuring unit configured to measure voltage and current of the battery during a charging process of the battery.

[0014] The above control unit may be configured to calculate the capacity of the battery based on the current measured by the measurement unit.

[0015] The control unit may be configured to calculate the charging capacity based on the current measured from the time when the voltage of the battery reaches the charging termination voltage.

[0016] The control unit may be configured to calculate the battery capacity based on the current measured until the voltage of the battery reaches the preset charging start voltage and the charging end voltage.

[0017] The above battery may have a capacity lower than the reference capacity due to loss of available lithium compared to the initial capacity.

[0018] A battery pack according to another aspect of the present invention may include a battery management device according to one aspect of the present invention.

[0019] A battery management method according to another aspect of the present invention may include a target capacity setting step of setting a target capacity based on a battery capacity and a preset reference capacity of the battery; a capacity comparison step of comparing a charge capacity after a preset charge termination voltage of the battery with the target capacity; and a charge command transmission step of transmitting a charge command based on a comparison result of the capacity comparison step.

[0020] According to one aspect of the present invention, a battery management device can increase the available capacity of a battery by forcibly oxidizing an electrolyte of a battery in which available lithium has been lost.

[0021] Additionally, the battery management device can prevent rapid battery degradation by restoring the imbalanced positive and negative electrode balance. In other words, the battery management device has the advantage of extending the battery's lifespan.

[0022] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0023] The following drawings attached to this specification serve to further understand the technical idea of ​​the present invention together with the detailed description of the invention described below, and therefore the present invention should not be interpreted as being limited to the matters described in such drawings.

[0024] FIG. 1 is a schematic diagram illustrating a battery management device according to one embodiment of the present invention.

[0025] FIGS. 2 to 4 are schematic drawings illustrating the positive and negative electrode profiles of a battery according to one embodiment of the present invention.

[0026] FIG. 5 is a schematic drawing of a battery pack according to another embodiment of the present invention.

[0027] FIG. 6 is a schematic drawing of a vehicle according to another embodiment of the present invention.

[0028] FIG. 7 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention.

[0029] Terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best possible manner.

[0030] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0031] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0032] Terms that include ordinal numbers, such as first, second, etc., are used to distinguish one of the various components from the rest, and are not used to limit the components by such terms.

[0033] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0034] Additionally, throughout the specification, when we say that a part is "connected" to another part, this includes not only cases where it is "directly connected" but also cases where it is "indirectly connected" with other elements in between.

[0035]

[0036] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0037] FIG. 1 is a schematic diagram illustrating a battery management device (100) according to one embodiment of the present invention.

[0038] Referring to FIG. 1, a battery management device (100) may include a charging unit (110) and a control unit (120).

[0039] The charging unit (110) may be electrically connected to the battery and configured to charge the battery.

[0040] Specifically, the charging unit (110) can be electrically connected to the positive and negative terminals of the battery. In addition, the charging unit (110) can charge the battery by applying a charging current to the positive terminal of the battery. For example, the charging unit (110) can charge the battery using at least one of a constant current (CC), a constant power (CP), and a pulse method.

[0041] Here, a battery refers to a physically separate, independent cell having a negative terminal and a positive terminal. For example, a lithium-ion battery or a lithium polymer battery may be considered a battery. Furthermore, the battery may be of a cylindrical type, a prismatic type, or a pouch type. Furthermore, a battery may also refer to a battery bank, a battery module, or a battery pack in which multiple cells are connected in series and / or parallel. For convenience of explanation, the term "battery" will be described herein below as referring to a single, independent cell.

[0042] In particular, a battery may lose available lithium compared to its initial capacity, resulting in a battery capacity lower than its reference capacity. In other words, the battery is a degraded battery due to lithium plating. Here, the reference capacity refers to the initial capacity of a battery in its beginning-of-life (BOL) state, the initial capacity of a reference battery corresponding to the battery, or the initial capacity of a theoretically ideal battery. For convenience of explanation, the reference capacity is described below as the initial capacity of the battery.

[0043] FIGS. 2 to 4 are schematic drawings illustrating the positive and negative electrode profiles (PN) of a battery according to one embodiment of the present invention.

[0044] Specifically, FIG. 2 is a schematic diagram illustrating the positive electrode profile (PP) and the negative electrode profile (PN) of a battery in a BOL state. Here, the positive electrode profile (PP) is a profile indicating the relationship between the voltage and capacity of the positive electrode of the battery. The negative electrode profile (PN) is a profile indicating the relationship between the voltage and capacity of the negative electrode of the battery. Referring to FIG. 2, the capacity corresponding to the positive electrode participation start point (pi0) and the negative electrode participation start point (ni0) is 5 [Ah], and the capacity corresponding to the positive electrode participation end point (pf0) and the negative electrode participation start point (nf0) is 50 [Ah]. Therefore, the capacity of the battery according to the embodiment of FIG. 2 is 45 [Ah], which can be preset as the reference capacity of the battery.

[0045] FIG. 3 is a schematic diagram illustrating the positive electrode profile (PP) and negative electrode profile (PN) of a battery in which available lithium has been lost. When available lithium is lost, the lithium intercalated into the crystal structure of the negative electrode material decreases, so that the negative electrode participation end point may change from nf0 to nf1. In addition, the positive electrode participation start point may change symmetrically from pi0 to pi1 as the negative electrode participation end point (nf1) changes. That is, in the embodiment of FIG. 3, the capacity corresponding to the positive electrode participation start point (pi1) is 15 [Ah], the capacity corresponding to the positive electrode participation end point (pf0) is 50 [Ah], the capacity corresponding to the negative electrode participation start point (ni0) is 5 [Ah], and the capacity corresponding to the negative electrode participation end point (nf1) is 40 [Ah]. Therefore, the capacity of the battery according to the embodiment of FIG. 3 is 35 [Ah].

[0046] The control unit (120) may be configured to set a target capacity based on the battery capacity and a preset reference capacity for the battery.

[0047] Here, the battery capacity refers to the current capacity of the battery or the capacity to be diagnosed. For example, in the embodiment of FIG. 2, the reference capacity of the battery is preset to 45 [Ah]. In the embodiment of FIG. 3, the battery capacity is 35 [Ah].

[0048] The control unit (120) can be configured to calculate the capacity difference between the reference capacity and the battery capacity.

[0049] Specifically, the control unit (120) can calculate the capacity difference according to the formula “|reference capacity - battery capacity|”. Here, “||” is a symbol indicating an absolute value.

[0050] For example, in the embodiments of FIGS. 2 and 3, the reference capacity is 45 [Ah] and the battery capacity is 35 [Ah]. Therefore, the control unit (120) can calculate the formula “45-35” to calculate the capacity difference as 10 [Ah].

[0051] The control unit (120) can be configured to set the target capacity based on the calculated capacity difference.

[0052] Specifically, the control unit (120) may be configured to set the target capacity to a value less than or equal to the capacity difference. For example, if the calculated capacity difference is n (n is a natural number), the control unit (120) may set the target capacity within a range greater than or equal to 0 and less than or equal to n.

[0053] In the preceding example, since the calculated capacity difference is 10 [Ah], the control unit (120) can set the target capacity within the range of 0 [Ah] to 10 [Ah]. In the following, for convenience of explanation, it is described that the control unit (120) sets the target capacity to 5 [Ah].

[0054] The control unit (120) may be configured to compare the charge capacity after the charge termination voltage of the battery with the target capacity.

[0055] Specifically, the battery can continue to charge even when the voltage exceeds a preset charge termination voltage. The capacity charged from the time the battery voltage reaches the charge termination voltage is the battery's charge capacity.

[0056] For example, assume that the battery's charge termination voltage is set to 4.2 [V] and the battery's voltage is charged to 4.3 [V]. The capacity charged until the battery's voltage reaches 4.2 [V] is the battery's charge capacity.

[0057] The control unit (120) can compare the charging capacity with the target capacity. For example, the control unit (120) can compare the charging capacity with the target capacity and determine that the charging capacity is less than or equal to the target capacity. As another example, the control unit (120) can compare the charging capacity with the target capacity and determine that the charging capacity is equal to the target capacity.

[0058] In the embodiment of Fig. 3, it is assumed that the target capacity is set to 5 [Ah]. The control unit (120) can compare the size of the charge capacity of the battery and the target capacity (5 [Ah]).

[0059] The control unit (120) may be configured to transmit a charging command to the charging unit (110) based on the comparison result.

[0060] Specifically, the control unit (120) may be configured to transmit a charging command to the charging unit (110) until the charging capacity reaches the target capacity. In other words, the control unit (120) may not transmit a charging command to the charging unit (110) if the charging capacity is equal to the target capacity. In other words, if the charging capacity and the target capacity are equal, charging by the charging unit (110) may be terminated.

[0061] In the embodiment of FIG. 3, the control unit (120) may transmit a charging command to the charging unit (110) when the charging capacity of the battery is less than the target capacity (5 [Ah]). In addition, the control unit (120) may not transmit a charging command to the charging unit (110) when the charging capacity of the battery reaches the target capacity (5 [Ah]). At this time, charging of the battery may be terminated.

[0062] FIG. 4 is a schematic diagram illustrating the positive electrode profile (PP) and negative electrode profile (PN) of a battery after charging has been completed. Specifically, in the embodiment of FIG. 4, the charging capacity of the battery has reached the target capacity (5 [Ah]), and thus charging of the battery has been completed. When the battery is charged to a voltage range after the charging termination voltage, the electrolyte may be oxidized. Due to the electrolyte oxidation reaction, the positive electrode participation start point shifts toward the low potential side, and correspondingly, the negative electrode participation end point shifts toward the high potential side. That is, the positive electrode participation start point may change from pi1 to pi2, and the negative electrode participation end point may change from nf1 to nf2. The capacity of the battery according to the embodiment of FIG. 4 may be 40 [Ah], which may be increased from the capacity (35 [Ah]) of the battery according to the embodiment of FIG. 3.

[0063] The battery management device (100) can increase the available capacity of a battery by forcibly oxidizing the electrolyte of a battery that has lost available lithium.

[0064] In addition, the battery management device (100) can prevent rapid degradation of the battery by restoring the distorted positive and negative balance. For example, referring to FIGS. 3 and 4, the positive and negative balance of FIG. 3 is more distorted than the positive and negative balance of FIG. 4. If the battery of FIG. 3 is operated without the positive and negative balance being restored, it may deteriorate more rapidly than the battery (FIG. 4) whose positive and negative balance has been restored by the battery management device (100). Therefore, the battery management device (100) has the advantage of increasing the expected lifespan of the battery.

[0065]

[0066] Meanwhile, the control unit (120) provided in the battery management device (100) may optionally include a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, etc. known in the art to execute various control logics performed in the present invention. In addition, when the control logic is implemented in software, the control unit (120) may be implemented as a set of program modules. In this case, the program modules may be stored in a memory and executed by the control unit (120). The memory may be located inside or outside the control unit (120) and may be connected to the control unit (120) by various well-known means.

[0067] In addition, the battery management device (100) may further include a storage unit (130). The storage unit (130) may store data or programs required for each component of the battery management device (100) to perform operations and functions, or data generated in the process of performing operations and functions. The storage unit (130) is not particularly limited in type as long as it is a known information storage means known to be capable of recording, erasing, updating, and reading data. As an example, the information storage means may include RAM, flash memory, ROM, EEPROM, registers, etc. In addition, the storage unit (130) may store program codes defining processes executable by the control unit (120).

[0068] For example, the storage unit (130) may store setting information such as the battery's reference capacity, charge termination voltage, and critical capacity. In addition, the storage unit (130) may store information regarding the battery's voltage and current measured by the measurement unit (140).

[0069]

[0070] In one embodiment, the control unit (120) may be configured to compare a preset threshold capacity and a capacity difference for a voltage range after the charge termination voltage of the battery.

[0071] Specifically, the critical capacity can be preset as the total anode capacity of the battery. If the designed anode capacity is 55 [Ah] and the anode capacity corresponding to the charge termination voltage is 50 [Ah], the critical capacity is 5 [Ah].

[0072] The control unit (120) can be configured to set the target capacity to a lower value between the threshold capacity and the capacity difference.

[0073] The control unit (120) can compare the critical capacity and the capacity difference. If the critical capacity is less than the capacity difference, the control unit (120) can set the critical capacity as the target capacity. Conversely, if the critical capacity exceeds the capacity difference, the control unit (120) can set the critical capacity as the target capacity.

[0074] If the target capacity is set to a value greater than the threshold capacity and the battery is charged until the charging capacity reaches the target capacity, the battery may be charged beyond the preset threshold capacity. Therefore, the battery's positive electrode may be subjected to strong stress, potentially resulting in a loss of capacity on the high-potential side of the positive electrode. For example, the positive electrode's engagement end point may shift to the low-potential side due to positive electrode degradation. Therefore, the battery management device (100) can prevent unnecessary positive electrode degradation by setting the target capacity based on the difference between the threshold capacity and the calculated capacity.

[0075]

[0076] Referring to FIG. 1, the battery management device (100) may further include a measuring unit (140).

[0077] The measuring unit (140) may be configured to measure the voltage and current of the battery during the charging process of the battery.

[0078] Specifically, the measuring unit (140) can be connected to the positive and negative terminals of the battery. The measuring unit (140) can measure the positive potential from the positive terminal of the battery and the negative potential from the negative terminal of the battery. In addition, the measuring unit (140) can measure the voltage of the battery by calculating the difference between the positive potential and the negative potential.

[0079] Additionally, the measuring unit (140) can be connected to the charge / discharge path of the battery. Here, the charge / discharge path is a high-current path through which the battery's charge current and discharge current flow. The measuring unit (140) can measure the battery's current by measuring the charge current (or discharge current) flowing in the charge / discharge path.

[0080] The measuring unit (140) can be connected to the control unit (120) via wires and / or wirelessly so as to be able to communicate with it. In addition, the measuring unit (140) can transmit information regarding the voltage and current of the battery to the control unit (120).

[0081] The control unit (120) may be configured to calculate the capacity of the battery based on the current measured by the measurement unit (140).

[0082] Specifically, the control unit (120) can calculate the capacity of the battery based on the current information received from the measurement unit (140). For example, the control unit (120) can calculate the capacity of the battery using the current integration method (coulomb counting method, ampere counting method).

[0083] The control unit (120) may be configured to calculate the battery capacity based on the current measured until the battery voltage reaches the charging end voltage from the preset charging start voltage. For example, the control unit (120) may calculate the battery capacity by integrating the measured current until the battery voltage reaches the charging end voltage. In addition, the control unit (120) may compare the calculated battery capacity with a reference capacity to calculate the capacity difference, and set the target capacity based on the calculated capacity difference.

[0084] In addition, the control unit (120) may be configured to calculate the charging capacity based on the current measured from the time when the battery voltage reaches the charging termination voltage. For example, the control unit (120) may calculate the charging capacity by integrating the current measured from the time when the battery voltage reaches the charging termination voltage. The control unit (120) may compare the calculated charging capacity with a set target capacity and control the charging of the battery based on the comparison result.

[0085] The battery management device (100) can control the charging of the battery by directly measuring the voltage and current of the battery. That is, the battery management device (100) can increase the expected life of the battery by reflecting the current status of the battery.

[0086]

[0087] The battery management device (100) according to the present invention can be applied to a BMS (Battery Management System). That is, the BMS according to the present invention can include the battery management device (100) described above. In this configuration, at least some of the components of the battery management device (100) can be implemented by supplementing or adding to the functions of the components included in a conventional BMS. For example, the charging unit (110), control unit (120), storage unit (130), and measurement unit (140) of the battery management device (100) can be implemented as components of the BMS.

[0088] Additionally, the battery management device (100) according to the present invention may be provided in a battery pack. That is, the battery pack according to the present invention may include the battery management device (100) described above and one or more battery cells. Additionally, the battery pack may further include electrical components (relays, fuses, etc.) and a case.

[0089] FIG. 5 is a schematic drawing of a battery pack according to another embodiment of the present invention.

[0090] The positive terminal of the battery (B) can be connected to the positive terminal (P+) of the battery pack (1), and the negative terminal of the battery (B) can be connected to the negative terminal (P-) of the battery pack (1).

[0091] The measuring unit (140) may be connected to a first sensing line (SL1), a second sensing line (SL2), and a third sensing line (SL3). Specifically, the measuring unit (140) may be connected to a positive terminal of the battery (B) through the first sensing line (SL1), and may be connected to a negative terminal of the battery (B) through the second sensing line (SL2). The measuring unit (140) may measure the voltage of the battery (B) based on the voltage measured at each of the first sensing line (SL1) and the second sensing line (SL2).

[0092] In addition, the measuring unit (140) can be connected to a current measuring unit (A) via a third sensing line (SL3). For example, the current measuring unit (A) can be an ammeter or shunt resistor capable of measuring the charging current and discharging current of the battery (B).

[0093] An external device can be connected to the positive terminal (P+) and negative terminal (P-) of the battery pack (1). For example, the external device can be a charging device or a load. In addition, the positive terminal of the battery (B), the positive terminal (P+) of the battery pack (1), the external device, the negative terminal (P-) of the battery pack (1), and the negative terminal of the battery (B) can be electrically connected.

[0094]

[0095] FIG. 6 is a schematic drawing of a vehicle according to another embodiment of the present invention.

[0096] Referring to FIG. 6, a battery pack according to an embodiment of the present invention may be included in a vehicle (600), such as an electric vehicle (EV) or a hybrid vehicle (HV). Furthermore, the battery pack (610) may drive the vehicle (600) by supplying power to a motor through an inverter provided in the vehicle (600). Here, the battery pack (610) may include a battery management device (100). That is, the vehicle (600) may include a battery management device (100). In this case, the battery management device (100) may be an onboard device included in the vehicle (600).

[0097]

[0098] FIG. 7 is a diagram schematically illustrating a battery management method according to another embodiment of the present invention.

[0099] Referring to FIG. 7, the battery management method may include a target capacity setting step (S100), a capacity comparison step (S200), and a charging command transmission step (S300).

[0100] Preferably, each step of the battery management method can be performed by a battery management device (100). In the following, for convenience of explanation, any content that overlaps with the previously described content will be omitted or briefly described.

[0101] The target capacity setting step (S100) is a step of setting the target capacity based on the battery capacity and the preset reference capacity for the battery, and can be performed by the control unit (120).

[0102] The control unit (120) may be configured to calculate the capacity difference between the reference capacity and the battery capacity. The control unit (120) may be configured to set the target capacity based on the calculated capacity difference.

[0103] The capacity comparison step (S200) is a step of comparing the charge capacity after the battery's charge termination voltage with the target capacity, and can be performed by the control unit (120).

[0104] The control unit (120) can compare the charging capacity with the target capacity. For example, the control unit (120) can compare the charging capacity with the target capacity and determine that the charging capacity is less than or equal to the target capacity. As another example, the control unit (120) can compare the charging capacity with the target capacity and determine that the charging capacity is equal to the target capacity.

[0105] The charging command transmission step (S300) is a step of transmitting a charging command based on the comparison result of the capacity comparison step (S200), and can be performed by the control unit (120).

[0106] Specifically, the control unit (120) may be configured to transmit a charging command to the charging unit (110) until the charging capacity reaches the target capacity. In other words, the control unit (120) may not transmit a charging command to the charging unit (110) if the charging capacity is equal to the target capacity. In other words, if the charging capacity and the target capacity are equal, charging by the charging unit (110) may be terminated.

[0107]

[0108] The embodiments of the present invention described above are not implemented only through devices and methods, but may also be implemented through a program that realizes a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded, and such implementation can be easily implemented by an expert in the technical field to which the present invention belongs based on the description of the embodiments described above.

[0109] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0110] In addition, the present invention described above is not limited to the above-described embodiments and the attached drawings, and all or part of each embodiment may be selectively combined and configured so that various modifications can be made, as those skilled in the art can make various substitutions, modifications, and changes within the scope of the technical idea of ​​the present invention.

[0111] (Explanation of symbols)

[0112] 10: Battery pack

[0113] 100: Battery management device

[0114] 110: Charging part

[0115] 120: Control unit

[0116] 130: Storage

[0117] 140: Measurement section

[0118] 600: Car

[0119] 610: Battery Pack

Claims

1. A charging unit electrically connected to a battery and configured to charge the battery; and A battery management device characterized by comprising a control unit configured to set a target capacity based on a battery capacity and a preset reference capacity for the battery, compare the charge capacity after a charge termination voltage of the battery with the target capacity, and transmit a charge command to the charger based on the comparison result.

2. In paragraph 1, The above control unit, A battery management device characterized in that it is configured to calculate a capacity difference between the reference capacity and the battery capacity and set the target capacity based on the calculated capacity difference.

3. In paragraph 2, The above control unit, A battery management device characterized in that it is configured to set the target capacity to a value less than or equal to the capacity difference.

4. In paragraph 2, The above control unit, A battery management device characterized in that it is configured to compare the preset threshold capacity and the capacity difference for a voltage section after the charge termination voltage of the battery, and set the target capacity to a lower value between the threshold capacity and the capacity difference.

5. In paragraph 1, The above control unit, A battery management device characterized in that it is configured to transmit a charging command to the charging unit until the charging capacity reaches the target capacity.

6. In paragraph 1, Further comprising a measuring unit configured to measure the voltage and current of the battery during the charging process of the battery; The above control unit, A battery management device characterized in that it is configured to calculate the capacity of the battery based on the current measured by the measuring unit.

7. In paragraph 6, The above control unit, A battery management device characterized in that it is configured to calculate the charging capacity based on the current measured from the time when the voltage of the battery reaches the charging termination voltage.

8. In paragraph 6, The above control unit, A battery management device characterized in that it is configured to calculate the battery capacity based on the measured current until the voltage of the battery reaches a preset charging start voltage and a charging end voltage.

9. In paragraph 1, The above battery, A battery management device characterized in that the battery capacity is configured to be less than the reference capacity due to loss of available lithium compared to the initial capacity.

10. A battery pack comprising a battery management device according to any one of claims 1 to 9.

11. Target capacity setting step for setting the target capacity based on the battery capacity and the preset reference capacity for the battery; A capacity comparison step for comparing the charge capacity after a preset charge termination voltage for the battery with the target capacity; and A battery management method characterized by including a charging command transmission step for transmitting a charging command based on the comparison result of the capacity comparison step.

Images