Battery management method and battery system using the same

Abstract

A battery system of a vehicle comprises a battery including a plurality of battery cells, a relay electrically connecting one end of the battery to an external device, and a battery management system. The battery management system comprises a monitoring IC connected to the plurality of battery cells to obtain information regarding the voltage of the plurality of battery cells and the temperature of the battery, and a main control circuit that receives vehicle operation information from the electronic control unit of the vehicle, estimates the charge capacity (SoC) of the battery using the obtained information and the current flowing through the battery, and determines whether the battery system and the vehicle satisfy the conditions for entering a hold mode based on the vehicle operation information and the charge capacity. If the battery system and the vehicle satisfy the conditions for entering a hold mode, the main control circuit changes the operating mode of the battery system to a hold mode that repeatedly turns the monitoring IC on and off over time.

Description

Technology Field

[0001] The present disclosure relates to a battery management method and a battery system using the same. Background Technology

[0002] A Battery Management System (BMS) may include a Battery Monitoring Integrated Circuit (BMIC) that monitors the main battery and a Main Control Unit (MCU) that controls it. Generally, The monitoring IC uses a high-voltage main battery as a power source, but the main control circuit (MCU) often uses a low-voltage auxiliary battery, such as a 12V lead-acid battery, as a power source.

[0003] Meanwhile, in cases where a vehicle is used exceptionally, such as when displayed in a showroom, the main battery may be displayed for a long time without being charged. In this situation, the monitoring IC continuously uses the main battery, posing a risk of over-discharging the main battery. Once the battery is over-discharged, it cannot be recharged and used again, which poses a problem of significant loss costs. The problem to be solved

[0004] The present invention aims to provide a battery management method and a battery system capable of preventing battery discharge by detecting exceptional use of a vehicle. means of solving the problem

[0005] A battery system of a vehicle according to one feature of the invention comprises a battery including a plurality of battery cells, a relay electrically connecting one end of the battery to an external device, and a battery management system. The battery management system comprises a monitoring IC connected to a plurality of battery cells to acquire information regarding the voltage of the plurality of battery cells and the temperature of the battery, and a main control circuit that receives vehicle operation information from an electronic control unit of the vehicle, estimates the charge capacity (SoC) of the battery using the acquired information and the current flowing through the battery, and determines whether the battery system and the vehicle satisfy the conditions for entering a hold mode based on the vehicle operation information and the charge capacity. When the battery system and the vehicle satisfy the conditions for entering a hold mode, the main control circuit changes the operation mode of the battery system to a hold mode in which the monitoring IC is repeatedly turned on and off over time.

[0006] The conditions for entering hold mode further include whether the standby mode of the battery system has been maintained for a predetermined standby time, and in the standby mode of the battery system, the main control circuit may be in a wake-up state, the relay may be open, and the monitoring IC may be in an ON state.

[0007] The vehicle operation information includes at least one of information regarding the vehicle's speed and the vehicle's gear mode, and the main control circuit may determine that the conditions for entering hold mode are satisfied if a standby time has elapsed since the battery system started operating in standby mode, the battery's charging capacity is less than a reference charging capacity, the vehicle's speed is less than a reference speed, or the vehicle's gear mode is parking mode.

[0008] The hold mode includes a monitoring off mode that turns off the monitoring IC for a preset first hold time and a monitoring on mode that turns on the monitoring IC for a second hold time shorter than the first hold time, and in the monitoring off mode and monitoring on mode, the main control circuit is in a wake-up state and the relay may be open.

[0009] A battery management method according to another feature of the invention comprises: a monitoring IC connected to a battery comprising a plurality of battery cells, acquiring information regarding the voltage of the plurality of battery cells and the temperature of the battery; a main control circuit estimating the charge capacity of the battery using the acquired information and the battery current flowing through the battery; a main control circuit receiving information regarding vehicle operation information from an electronic control unit of the vehicle; a main control circuit determining whether the battery system and the vehicle satisfy the conditions for entering a hold mode based on the vehicle operation information and the charge capacity; and, if the battery system and the vehicle satisfy the conditions for entering a hold mode, the main control circuit controlling the operation mode of the battery system to change to a hold mode that repeatedly turns the monitoring IC on and off over time.

[0010] The conditions for entering hold mode further include whether the standby mode of the battery system has been maintained for a predetermined standby time, and in the standby mode of the battery system, the main control circuit may be in a wake-up state, the relay may be open, and the monitoring IC may be in an ON state.

[0011] The vehicle operation information includes at least one of information regarding the vehicle and the vehicle's gear mode, and the step of the main control circuit determining whether the battery system and the vehicle satisfy the conditions for entering a hold mode may include the step of the main control circuit determining that the conditions for entering a hold mode are satisfied if a standby time has elapsed since the battery system started operating in standby mode, the charging capacity of the battery is less than a reference charging capacity, the speed of the vehicle is less than a reference speed, or the vehicle's gear mode is in parking mode.

[0012] The hold mode includes a monitoring off mode that turns off the monitoring IC for a preset first hold time and a monitoring on mode that turns on the monitoring IC for a second hold time shorter than the first hold time, and in the monitoring off mode and monitoring on mode, the main control circuit is in a wake-up state and the relay may be open.

[0013] A vehicle according to another feature of the invention comprises: an electronic control unit that generates vehicle operation information including at least one of information regarding the vehicle's speed and the vehicle's gear mode; and a battery system including a battery comprising a plurality of battery cells and a battery management system that manages the battery. The battery management system comprises: a monitoring IC connected to the battery comprising the plurality of battery cells to acquire information regarding the voltage of the plurality of battery cells and the temperature of the battery; and a main control circuit that receives vehicle operation information from the electronic control unit, estimates the charge capacity (SoC) of the battery using the acquired information and the current flowing through the battery, determines whether the battery system and the vehicle satisfy conditions for entering a hold mode based on the vehicle operation information and the charge capacity, and if the conditions for entering a hold mode are satisfied, controls the operation mode of the battery system to change to a hold mode that repeats turning the monitoring IC on and off over time.

[0014] The conditions for entering hold mode further include whether the standby mode of the battery system has been maintained for a predetermined standby time, and in the standby mode of the battery system, the main control circuit may be in a wake-up state, the relay may be open, and the monitoring IC may be in an ON state.

[0015] The main control circuit can determine that the conditions for entering hold mode are satisfied if, after a standby time has elapsed since the battery system started operating in standby mode, the battery's charging capacity is less than the reference charging capacity, the vehicle's speed is less than the reference speed, or the vehicle's gear mode is parking mode.

[0016] The hold mode includes a monitoring off mode that turns off the monitoring IC for a preset first hold time and a monitoring on mode that turns on the monitoring IC for a second hold time shorter than the first hold time, and in the monitoring off mode and monitoring on mode, the main control circuit is in a wake-up state and the relay may be open. Effects of the invention

[0017] The present invention provides a battery system and a battery management method capable of preventing over-discharge of a battery. Brief explanation of the drawing

[0018] FIG. 1 is a drawing illustrating a vehicle equipped with a battery system according to one embodiment. Figure 2 is an example diagram illustrating the operation mode of the battery system shown in Figure 1. FIG. 3 is a flowchart illustrating a battery management method according to one embodiment. Specific details for implementing the invention

[0019] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are assigned identical or similar reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and / or "part" for components used in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not have distinct meanings or roles in themselves. Furthermore, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description will be omitted. Additionally, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification; the technical concept disclosed in this specification is not limited by the attached drawings, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the invention.

[0020] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0021] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0022] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0024] FIG. 1 is a drawing illustrating a vehicle equipped with a battery system according to one embodiment.

[0025] In FIG. 1, only the components necessary to explain the battery system (1) according to one embodiment of the vehicle (100) are shown, and other components may be connected.

[0026] Referring to FIG. 1, the vehicle (100) includes a battery system (1) and an electronic control unit (2).

[0027] The battery system (1) includes a battery (10), relays (21, 23), and a battery managing system (BMS) (30).

[0028] The battery (10) includes a plurality of battery cells (Cell1 - Celln). The battery (10) may be electrically connected to an external device through the first output terminal (OUT1) and the second output terminal (OUT2) of the battery system (1). The external device may be a charger or a load.

[0029] The relay (21) can be connected between the positive terminal of the battery (10) and the first output terminal (OUT1). Alternatively, the relay (23) can be connected between the negative terminal of the battery (10) and the second output terminal (OUT2). The relays (21, 23) can be closed by the control of the BMS (30) during charging and discharging to electrically connect the battery (10) to an external device. Additionally, the relays (21, 23) can be opened by the control of the BMS (30) to electrically disconnect the battery (10) from the external device.

[0030] The BMS (30) determines the operating mode of the battery system (1) and controls the battery system (1) overall according to the determined operating mode. The BMS (30) may include a monitoring IC (BMIC) (310), a main control circuit (MCU) (330), and a communication unit (350).

[0031] A monitoring IC (310) is connected to each of a plurality of battery cells (Cell1 - Celln) to measure the cell voltage of each of the plurality of battery cells (Cell1 - Celln) and transmit the measured result to an MCU (330). Additionally, the monitoring IC (310) can receive information regarding the temperature detected by a temperature sensor (not shown) provided in the battery (10) and transmit it to the MCU (330). Based on the information regarding the temperature, the MCU (330) can estimate the temperature of the battery (10) and / or the temperature of each of the plurality of battery cells (Cell1 - Celln). Hereinafter, the temperature of the battery (10) and / or the temperature of each of the plurality of battery cells (Cell1 - Celln) are collectively referred to as the temperature of the battery (10).

[0032] In addition, the monitoring IC (310) can perform cell balancing for a battery cell that requires cell balancing among a plurality of battery cells (Cell1 - Celln) under the control of the MCU (330). However, the invention is not limited thereto, and the balancing circuit for cell balancing can be implemented as a separate circuit distinct from the monitoring IC (310).

[0033] The current sensor (25) is connected in series to the current path between the battery (10) and the external device. The current sensor (25) can measure the current flowing through the battery (10), i.e., the charging current and the discharging current, and transmit the measurement results to the MCU (330).

[0034] The MCU (330) can estimate the State of Charge (SOC) of each of the plurality of battery cells (Cell1 - Celln) based on information received from the monitoring IC (310) and the current sensor (25). The MCU (330) can estimate the charge capacity of the battery (10) based on the SoCs of the plurality of battery cells (Cell1 - Celln). The method by which the MCU (330) estimates the charge capacity of each of the plurality of battery cells can be implemented in various known methods, such as a current integration method, a method using an equivalent circuit model, or a method combining the two methods. According to one embodiment, the MCU (330) estimates the charge capacity of each of the plurality of battery cells (Cell1 - Celln) by integrating the battery current, and corrects the charge capacity estimated based on the current integration based on the voltage and battery temperature of each of the plurality of battery cells. However, the present invention is not limited thereto.

[0035] The charge capacity (SOC) of the battery (10) can be estimated, and charging and discharging can be controlled based on the estimated charge capacity. However, the invention is not limited thereto, and the MCU (330) may also estimate the charge capacity of a specific cell among a plurality of battery cells (Cell1 - Celln). Additionally, the MCU (330) may control cell balancing operations for a plurality of battery cells (Cell1 - Celln) based on information regarding a plurality of cell voltages received from the monitoring IC (310).

[0036] The MCU (330) can receive power from an auxiliary battery. In this case, the auxiliary battery is a rechargeable secondary battery and may be a 12V lead-acid battery. For example, in various situations such as when a vehicle is displayed in a showroom, the auxiliary battery can be connected to a charger and charged. Then, even if the MCU (330) remains on, an event in which the auxiliary battery is over-discharged may not occur.

[0037] The communication unit (350) can request or receive information through wireless communication with the electronic control unit (2) of the vehicle. For example, the communication unit (350) can communicate with the electronic control unit (2) through a CAN (Controller Area Network) communication network.

[0038] The electronic control unit (2) can control the operation of the vehicle (100) by obtaining information necessary for the operation of the vehicle (100). For example, the electronic control unit (2) may include the vehicle's ECU (electronic control unit).

[0039] The electronic control unit (2) can receive information regarding the battery system (1) necessary for the operation of the vehicle from the BMS (30). For example, the information regarding the battery system (1) may include information regarding the charge state of the battery (10), the voltage of multiple cells of multiple battery cells (Cell1 - Celln), the battery current, and the temperature of the battery (10). Based on this, the electronic control unit (2) can request control necessary for the operation of the battery system (1) from the BMS (30).

[0040] Additionally, the electronic control unit (2) can transmit a mode switching request to the BMS (30) to change the operating mode of the battery system (1). Accordingly, the BMS (30) can control the operation of the battery system (1) according to the received operating mode.

[0041] In addition, the electronic control unit (2) can check the vehicle's operation information. For example, the vehicle's operation information may include the vehicle's speed and / or the vehicle's gear mode. If there is a request for information regarding the vehicle's operation information from the BMS (30), the electronic control unit (2) can transmit the information to the BMS (30).

[0043] Figure 2 is an example diagram illustrating the operating mode of the battery system (1) shown in Figure 1.

[0044] The battery system (1) can operate in one of the following modes: sleep mode (M1), standby mode (M2), on mode (M3), and hold mode (M4).

[0045] Sleep mode (M1) may be a state in which the battery system (1) is off and the battery system (1) is not electrically connected to an external device. For example, sleep mode (M1) may be a mode in which the MCU (330) is in a sleep state, the relays (21, 23) are open, and the monitoring IC (310) is off.

[0046] While the battery system (1) is operating in sleep mode (M1), if a mode switching request is received from the electronic control unit (2), the MCU (330) can control the battery system (1) to operate in the received mode. The mode switching request may be generated by the electronic control unit (2) of the vehicle or may be generated independently by the MCU (330). The mode switching request may include a wake-up request, a close request, a sleep request, etc.

[0047] For example, when the MCU (330) receives a wake-up request from the electronic control unit (2), the MCU (330) can control the battery system (1) to operate in standby mode (M2). For example, the electronic control unit (2) can generate a wake-up request and send it to the MCU (330) when it detects that a person is sitting in the vehicle. Alternatively, the MCU (330) may generate a wake-up request itself to monitor the battery (1) at regular intervals.

[0048] The standby mode (M2) may be a state in which the battery system (1) is turned on and the battery system (1) is not electrically connected to an external device. For example, the standby mode (M2) may be a mode in which the MCU (330) is in a wake-up state, the relays (21, 23) are open, and the monitoring IC (310) is turned on.

[0049] While the battery system (1) is operating in standby mode (M2), if the MCU (330) receives a mode switching request from the electronic control unit (2), the battery system (1) can be controlled to operate in the received mode.

[0050] For example, when the MCU (330) receives a sleep request to sleep mode (M1), the MCU (330) can control the battery system (1) to operate in sleep mode (M1). Additionally, when the MCU (330) receives a relay close request to turn on mode (M3), the MCU (330) can close the relays (21, 23) to control the battery system (1) to operate in turn mode (M3).

[0051] The ON mode (M3) is a state in which the battery system (1) is ON and the relays (21, 23) are closed so that the battery system (1) is electrically connected to an external device. For example, the ON mode (M3) may be a state in which the vehicle is running or the battery (10) is being charged.

[0052] Meanwhile, there may be cases where the vehicle operates in standby mode (M2) for a long time. In standby mode (M2), the monitoring IC (310) is connected to the battery (10) and receives driving power. Conventionally, the battery may be over-discharged due to the power consumption of the monitoring IC.

[0053] In order to prevent this, an MCU (330) according to one embodiment of the present invention can control the battery system (1) to operate in a halt mode (M4) when the battery system (1) and the vehicle satisfy the conditions for entering a halt mode in standby mode (M2).

[0054] Holt mode (M4) This is a mode for preventing over-discharge of the battery (10), which controls the on and off of the monitoring IC (310) over time.

[0055] The MCU (330) can determine that the battery system (1) and the vehicle satisfy the conditions for entering hold mode if (i) a preset waiting time has elapsed since the battery system (1) started operating in standby mode (M2), (ii) the speed of the vehicle is less than the reference speed or the gear mode of the vehicle is in parking mode, and (iii) the current charging capacity is less than the reference charging capacity. At this time, the waiting time may be 1 hour.

[0056] Specifically, the MCU (330) can determine whether the estimated battery (10) charge capacity (SOC) is less than the reference charge capacity. At this time, the reference charge capacity may be the minimum charge capacity of the battery (10). However, the invention is not limited thereto, and the MCU (330) may determine whether the SOC of a specific cell among a plurality of battery cells (Cell1 - Celln) is less than the minimum charge capacity of the cell.

[0057] Additionally, the MCU (330) can receive vehicle operation information from the battery control unit (2). Based on the received vehicle operation information, the MCU (330) can determine whether the current vehicle speed is below a reference speed. At this time, the reference speed may be 5 km / h. Alternatively, the MCU (330) can determine whether the current vehicle gear mode is in parking mode.

[0058] The MCU (330) can control the battery system (1) to operate in a hold mode (M4) when the battery system (1) and the vehicle satisfy the conditions for entering a hold mode. Specifically, the MCU (330) can repeatedly control the battery system (1) to perform a monitoring off mode (M41) during a first hold time and a monitoring on mode (M42) during a second hold time. For example, the first hold time may be 3 hours and the second hold time may be 3 minutes. However, it is not limited thereto, and the first hold time and the second hold time may be determined in various ways.

[0059] The monitoring off mode (M41) may be such that the monitoring IC (310) is off, the MCU (330) is in a wake-up state, and the relays (21, 23) are open.

[0060] The monitoring on mode (M42) may be such that the monitoring IC (310) is on, the MCU (330) is in a wake-up state, and the relays (21, 23) are open.

[0061] That is, in the monitoring off mode (M41) and monitoring on mode (M42), the MCU (330) is in a wake-up state, the relays (21, 23) are open, and the only difference is whether the monitoring IC (310) is operating.

[0062] During the monitoring on mode (M42), the monitoring IC (310) can monitor information regarding multiple battery cells (Cell1 - Celln) and transmit the monitored information to the MCU (330). During the monitoring off mode (M41), the monitoring IC (310) does not monitor the battery cells, and the values ​​measured during the monitoring on mode (M42) can be retained.

[0063] When the battery system (1) is operating in a hold mode (M4) and the MCU (330) receives a mode switching request, the MCU (330) can control the battery system (1) to exit the hold mode and operate in the requested mode.

[0064] For example, when the battery system (1) is operating in hold mode (M4) and the MCU (330) receives a first signal (S1) which is a sleep request, the main control circuit (310) can terminate the hold mode. Afterward, the MCU (330) can switch the operation of the battery system (1) to sleep mode (M1).

[0065] As another example, when the battery system (1) is operating in a hold mode (M4) and the MCU (330) receives a second signal (S2) which is a close request, the MCU (330) can exit the hold mode. Afterward, the operation of the battery system (1) can be switched to an on mode (M2).

[0067] FIG. 3 is a flowchart illustrating a battery management method according to one embodiment.

[0068] Referring to FIG. 3, the MCU (330) controls the battery system (1) to enter standby mode (M2) (S1).

[0069] Next, the MCU (330) determines whether the battery system (1) and the vehicle satisfy the conditions for entering a hold mode (S2).

[0070] The conditions for entering the hold mode are conditions required for the battery system (1) to enter the hold mode (M4), and may include conditions regarding the mode and charge capacity of the battery system (1) and the operating state of the vehicle. For example, the conditions for entering the hold mode include: (i) a preset standby time has elapsed since the battery system (1) started operating in standby mode (M2); (ii) the speed of the vehicle is below a reference speed or the gear mode of the vehicle is in parking mode; and (iii) the current charge capacity is below the reference charge capacity.

[0071] If, as a result of the judgment, the condition for entering hold mode is not satisfied (S2, NO), the MCU (330) controls the battery system (1) to continue operating in standby mode (M2).

[0072] When the battery system (1) and the vehicle satisfy the conditions for entering a hold mode (S2, Yes), the MCU (330) controls the battery system (1) to operate in a hold mode (M4) (S3).

[0073] In step S3, the MCU (330) can control the battery system (1) to operate in hold mode (M4) by repeatedly turning the monitoring IC (310) on and off.

[0074] Next, while the battery system (1) is operating in hold mode (M4), the MCU (330) determines whether it receives a mode switching request (S4).

[0075] If, as a result of the judgment, a mode switching request is not received (S4, NO), the MCU (330) controls the battery system (1) to continue operating in hold mode (M4).

[0076] When a mode switching request is received as a result of the judgment (S4, YES), the MCU (330) controls the battery system (1) to operate in the received mode (S5).

[0077] The received mode may be a sleep mode (M1) or an on mode (M3).

[0078] According to one embodiment of the present disclosure, in addition to the Sleep Mode, Battery Ready Mode, and On Mode of a conventional battery system, a Halt Mode is added to prevent over-discharge of the battery for exceptional use of the vehicle.

[0079] According to one embodiment of the present disclosure, when a vehicle operates in battery standby mode for a long time, the battery power consumption of the monitoring IC can be reduced to prevent over-discharge of the battery.

[0080] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modified and improved forms by those skilled in the art to which the present invention pertains also fall within the scope of the present invention. Explanation of the symbols

[0081] 1: Battery System 2: Electronic control unit 10: Battery 21, 23: Relay 30: Battery Management System (BMS) 100: Vehicle 310: Monitoring IC (Battery Monitoring Integrated Circuit, BMIC) 330: Main Control Unit (MCU) 350: Communications Department

Claims

Claim 1 A battery system for a vehicle comprises a battery including a plurality of battery cells, a relay electrically connecting one end of the battery to an external device, and a battery management system, wherein the battery management system comprises a monitoring IC connected to the plurality of battery cells to obtain information regarding the voltage of the plurality of battery cells and the temperature of the battery, and a main control circuit that receives vehicle operation information from the electronic control unit of the vehicle, estimates the charge capacity (SoC) of the battery using the obtained information and the current flowing through the battery, and determines whether the battery system and the vehicle satisfy a condition for entering a halt mode based on the vehicle operation information and the charge capacity, wherein if the battery system and the vehicle satisfy the condition for entering a halt mode, the main control circuit controls the operation mode of the battery system to change to a halt mode that repeats the on and off of the monitoring IC over time, and the condition for entering a halt mode further includes whether the standby mode of the battery system has been maintained for a predetermined standby time, wherein in the standby mode of the battery system, the main control circuit is in a wake-up state, the relay is open, and the monitoring IC is in an on state. System. Claim 2 delete Claim 3 A battery system according to claim 1, wherein the driving information of the vehicle includes at least one of the speed of the vehicle and the gear mode of the vehicle, and the main control circuit determines that the condition for entering the hold mode is satisfied when the standby time has elapsed from the time the battery system starts operating in standby mode, the charging capacity of the battery is less than the reference charging capacity, the speed of the vehicle is less than the reference speed, or the gear mode of the vehicle is parking mode. Claim 4 In paragraph 3, the halt mode includes a monitoring off mode that turns off the monitoring IC for a preset first halt time and a monitoring on mode that turns on the monitoring IC for a second halt time shorter than the first halt time, and in the monitoring off mode and the monitoring on mode, the main control circuit is in a wake-up state and the relay is open, a battery system. Claim 5 A battery management method for a battery system comprising a plurality of battery cells, wherein a monitoring IC connected to a battery comprising a plurality of battery cells acquires information regarding the voltage of the plurality of battery cells and the temperature of the battery; a main control circuit estimates the charging capacity of the battery using the acquired information and the battery current flowing through the battery; the main control circuit receives information regarding the operation information of the vehicle from an electronic control unit of the vehicle; and the main control circuit determines whether the battery system and the vehicle satisfy the conditions for entering a hold mode based on the operation information of the vehicle and the charging capacity. A battery management method comprising the step of, when the battery system and the vehicle satisfy the condition for entering the hold mode, controlling the main control circuit to change the operating mode of the battery system to a hold mode that repeats turning the monitoring IC on and off over time, wherein the condition for entering the hold mode further includes whether the standby mode of the battery system has been maintained for a predetermined standby time, and in the standby mode of the battery system, the main control circuit is in a wake-up state, a relay electrically connecting one end of the battery and an external device is open, and the monitoring IC is in an ON state. Claim 6 delete Claim 7 A battery management method according to claim 5, wherein the driving information of the vehicle includes at least one of information regarding the vehicle and the gear mode of the vehicle, and the step of the main control circuit determining whether the battery system and the vehicle satisfy the conditions for entering a hold mode includes the step of the main control circuit determining that the conditions for entering a hold mode are satisfied if the standby time has elapsed from the time the battery system started operating in standby mode, the charging capacity of the battery is less than a reference charging capacity, the speed of the vehicle is less than a reference speed, or the gear mode of the vehicle is parking mode. Claim 8 A battery management method according to claim 7, wherein the halt mode includes a monitoring off mode in which the monitoring IC is turned off for a preset first halt time and a monitoring on mode in which the monitoring IC is turned on for a second halt time shorter than the first halt time, and in the monitoring off mode and the monitoring on mode, the main control circuit is in a wake-up state and the relay is open. Claim 9 A vehicle comprising: an electronic control unit that generates vehicle operation information including at least one of information regarding the speed of the vehicle and the gear mode of the vehicle; a battery system including a battery comprising a plurality of battery cells and a battery management system that manages the battery, wherein the battery management system comprises: a monitoring IC connected to the battery comprising the plurality of battery cells to obtain information regarding the voltage of the plurality of battery cells and the temperature of the battery; and a main control circuit that receives vehicle operation information from the electronic control unit, estimates the charge capacity (SoC) of the battery using the obtained information and the current flowing through the battery, determines whether the battery system and the vehicle satisfy conditions for entering a hold mode based on the vehicle operation information and the charge capacity, and if the conditions for entering a hold mode are satisfied, controls the operation mode of the battery system to change to a hold mode that repeats turning the monitoring IC on and off over time. Claim 10 In claim 9, the condition for entering the halt mode further includes whether the standby mode of the battery system has been maintained for a predetermined standby time, and in the standby mode of the battery system, the main control circuit is in a wake-up state, a relay electrically connecting one end of the battery and an external device is open, and the monitoring IC is in an ON state, a vehicle. Claim 11 A vehicle according to claim 10, wherein the main control circuit determines that the condition for entering the hold mode is satisfied when the standby time has elapsed since the battery system started operating in standby mode, the charging capacity of the battery is less than the reference charging capacity, the speed of the vehicle is less than the reference speed, or the gear mode of the vehicle is parking mode. Claim 12 In claim 11, the above-mentioned halt mode includes a monitoring off mode that turns off the monitoring IC for a preset first halt time and a monitoring on mode that turns on the monitoring IC for a second halt time shorter than the first halt time, wherein in the monitoring off mode and the monitoring on mode, the main control circuit is in a wake-up state and the relay is open, a vehicle.

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