Battery system including a power supply unit and method of operating the same

Abstract

A battery system according to an embodiment of the present application can include a battery, a breaker located on a charge / discharge line of the battery, and a battery management device configured to manage the battery and control an operation of the breaker. Here, the battery management device can include a controller, a power supply unit configured to receive power from the battery through a first power supply line and supply power to the controller, and a power holding device configured to receive power from the battery through a second power supply line and supply temporary power to the power supply unit in a state in which the breaker is open.

Description

Technical Field

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0118236, filed on September 2, 2024, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to a battery system and its operating method, and more specifically to a battery system and its operating method comprising a power supply unit that supplies power to a battery control device. Background Technology

[0003] Rechargeable and reusable secondary batteries can be used as a power source for small devices such as mobile phones, tablet PCs and vacuum cleaners, as well as for medium and large devices such as automobiles and energy storage systems (ESS) for smart grids.

[0004] Depending on system requirements, secondary batteries can be used in the system as components, such as battery packs in which multiple battery cells are electrically connected, or battery racks in which battery packs are electrically connected. For ESS (Emerging Power Supply) systems used in smart grids, high-capacity battery systems with multiple battery racks connected in parallel can be used to meet the system's required capacity.

[0005] Typically, a battery rack may include a battery protection unit (BPU) to protect the batteries from abnormal and fault currents. The BPU may include a circuit breaker (CB) for forcibly disconnecting the electrical connection between the battery rack and the DC link, as well as a rack battery management system (RBMS) for monitoring and managing the battery pack.

[0006] RBMS may also include a power supply unit (e.g., a switch-mode power supply (SMPS)) that receives power from the battery pack and supplies power to the microcontroller unit (MCU), communication module and other components.

[0007] If a dangerous situation occurs in the battery rack and the circuit breaker trips, the battery power supply to the power supply unit is cut off. Therefore, the RBMS becomes off instead of properly executing the power-off sequence, which includes checking the status of internal components, storing data, and switching internal components to the off state.

[0008] Among the prior art documents related to this invention, JP 2020-072596A is somewhat relevant. Summary of the Invention

[0009] Technical issues

[0010] To avoid one or more problems of the related art, embodiments of this disclosure provide a battery system including a power retention unit that supplies temporary power to a power supply unit.

[0011] To avoid one or more problems of the related technology, embodiments of this disclosure also provide a method for operating a battery system.

[0012] To avoid one or more problems of the related technology, embodiments of this disclosure also provide a battery management device included in a battery system.

[0013] Technical solution

[0014] To achieve the purposes of this disclosure, a battery system may include: a battery; a circuit breaker located on the battery's charge / discharge line; and a battery management device configured to manage the battery and control the operation of the circuit breaker.

[0015] Here, the battery management device may include: a controller; a power supply unit configured to receive power from the battery via a first power supply line and supply power to the controller; and a power holding device configured to receive power from the battery via a second power supply line and supply temporary power to the power supply unit when the circuit breaker is open.

[0016] The controller can control the power holding device to activate the second power supply line when a predefined circuit breaker tripping event occurs.

[0017] The controller can switch the circuit breaker to the open state after the second power supply line is activated, and switch the second power supply line to the inactive state when a predetermined time period has elapsed or a predetermined power outage sequence has been completed.

[0018] The first power supply line may have one end connected between the circuit breaker and the main contactor located on the charging / discharging line, and the other end connected to the first power input terminal of the power supply unit.

[0019] The second power supply line may have one end connected between the battery's output terminal and the circuit breaker, and the other end connected to the second power input terminal of the power supply unit.

[0020] The power holding device may include a power holding switch installed on the second power supply line. Here, when a predefined circuit breaker tripping event occurs, the controller can switch the power holding switch from an open state to a closed state, thereby switching the second power supply line to an active state.

[0021] The power holding device may include: a MOSFET disposed on a second power supply line; an optocoupler that applies a gate voltage to the MOSFET; and a voltage supply switch disposed on the path supplying the operating voltage to the optocoupler. Here, when a predefined circuit breaker tripping event occurs, the controller switches the voltage supply switch from an open state to a closed state, thereby switching the second power supply line to an active state.

[0022] Optocouplers can receive operating voltage from the power supply unit.

[0023] According to another embodiment of this disclosure, a method of operating a battery system can be performed by a battery management device, the battery management device comprising: a controller; a power supply unit configured to receive power from the battery via a first power supply line and supply power to the controller; and a power holding device configured to receive power from the battery via a second power supply line and supply temporary power to the power supply unit.

[0024] The method of operating the battery system may include: monitoring whether a predefined circuit breaker disconnection event has occurred; if a circuit breaker disconnection event has occurred, controlling a power holding device to switch a second power supply line from a deactivated state to an activated state; and after the second power supply line is activated, switching the circuit breaker on the battery's charging / discharging line to a disconnected state.

[0025] The method of operating the battery system may also include switching the second power supply line to a deactivated state if a predetermined time period has elapsed or a predetermined power outage sequence has been completed after the circuit breaker has been switched to the open state.

[0026] Switching the second power supply line from a deactivated state to an activated state may include switching the power holding switch installed on the second power supply line from an open state to a closed state, thereby switching the second power supply line to an activated state.

[0027] The power holding device may include: a MOSFET disposed on a second power supply line; an optocoupler that applies a gate voltage to the MOSFET; and a voltage supply switch disposed on the path supplying an operating voltage to the optocoupler. Here, switching the second power supply line from a deactivated state to an activated state may include switching the voltage supply switch from an open state to a closed state, thereby switching the second power supply line to an activated state.

[0028] According to another embodiment of this disclosure, a battery management device is located between a circuit breaker and a DC link disposed on a battery charging / discharging line. The battery management device may include: a controller; a power supply unit configured to receive power from the battery via a first power supply line and supply power to the controller; and a power holding device configured to receive power from the battery via a second power supply line and supply temporary power to the power supply unit when the circuit breaker is open.

[0029] Beneficial effects

[0030] According to embodiments of this disclosure, even when the circuit breaker is switched to the open state, the battery power supplied to the power supply equipment can be maintained, thereby allowing the battery system to be stably disconnected. Attached Figure Description

[0031] Figure 1 This is a block diagram of a general energy storage system.

[0032] Figure 2 The structure of a universal battery holder is shown.

[0033] Figure 3 This is a block diagram of a battery system according to an embodiment of the present invention.

[0034] Figure 4 This is a circuit diagram of a battery protection device according to an embodiment of the present invention.

[0035] Figure 5 This is a circuit diagram of a power holding unit according to an embodiment of the present invention.

[0036] Figure 6 This is a flowchart illustrating an operation method of a battery system according to an embodiment of the present invention.

[0037] Figure 7 and Figure 8 This is a reference diagram used to illustrate the operation method of a battery system according to an embodiment of the present invention.

[0038] Figure 9 This is a block diagram of a controller according to an embodiment of the present invention.

[0039] 100: Battery protection equipment

[0040] 110: Battery Management Device

[0041] 111: Controller

[0042] 112: Power Supply Unit

[0043] 113: Power Holding Unit

[0044] 114: Current sensor

[0045] 120: Circuit breaker

[0046] 200: Battery Components

[0047] 210: Battery Detailed Implementation

[0048] This invention can be modified in various forms and has various embodiments, and specific embodiments thereof are shown by way of example in the accompanying drawings and will be described in detail below. However, it should be understood that the invention is not intended to be limited to the specific embodiments, but rather, the invention should cover all modifications, equivalents, and substitutions falling within the spirit and scope of the invention. Throughout the description of the accompanying drawings, similar reference numerals refer to similar elements.

[0049] It should be understood that although terms such as first, second, A, B, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the invention. As used herein, the term "and / or" includes a combination of multiple associated listed items or any one of multiple associated listed items.

[0050] It should be understood that when a component is described as being “coupled” or “connected” to another component, it can be directly coupled or connected to the other component, or there may be intermediate components. Conversely, when a component is described as being “directly coupled” or “directly connected” to another component, there are no intermediate components.

[0051] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprising,” “including,” “containing,” “comprise,” and / or “having” as used herein specify the presence of stated features, integers, steps, operations, constituent elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, constituent elements, components, and / or combinations thereof.

[0052] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant field, and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0053] Some of the terms used in this article are defined as follows.

[0054] A battery cell is a basic unit used to store electricity, and a battery module is an assembly in which multiple battery cells are electrically connected.

[0055] A battery rack can refer to a system of single structures assembled by connecting module units in series or parallel, as specified by the battery manufacturer, and that can be monitored and controlled by a battery management system (BMS). A battery rack may include several battery modules and battery protection units or any other protection devices. Here, depending on the device or system using batteries, a battery module may also be referred to as a battery pack.

[0056] A battery bank refers to a large system of battery racks configured by connecting multiple battery racks in parallel. A battery bank BMS can monitor and control several BMSs, with each BMS managing one battery rack.

[0057] A battery assembly may include multiple electrically connected battery cells and refers to an assembly used as a power source by being applied to a particular system or device. Here, a battery assembly may mean a battery module, battery pack, battery rack, or battery bank, but the scope of the invention is not limited to these entities.

[0058] A battery system controller (BSC) is the highest-level device that controls a battery system, including a battery bank-level structure or a multi-bank structure.

[0059] State of charge (SOC) refers to the current state of a battery, expressed as a percentage point [%], and state of health (SOH) refers to the current condition of a battery compared to its ideal or original condition, expressed as a percentage point [%].

[0060] Figure 1 This is a block diagram of a general energy storage system.

[0061] Typically, a battery cell is the basic unit of a battery used to store electricity in an energy storage system (ESS). Series / parallel combinations of battery cells form battery packs, and multiple battery packs form battery racks. In other words, a battery rack, as a series / parallel combination of battery packs, can be the basic unit of a battery system. Here, depending on the device or system in which the batteries are used, a battery pack can be referred to as a battery module.

[0062] refer to Figure 1 A battery rack may include multiple battery packs and battery protection units (BPUs) 50 or protection devices. The battery rack can be monitored and controlled by a rack battery management system (RBMS). The RBMS can monitor the current, voltage, and temperature of each managed battery rack, calculate the state of charge (SOC) of the batteries based on the monitoring results, and control charging and discharging.

[0063] Meanwhile, the BPU 50 is a device used to protect batteries from abnormal and fault currents in the battery rack. The BPU may include a main contactor MC, a fuse, a circuit breaker CB, or a disconnect switch DS. The BPU can control the battery system rack rack by rack-by-rack by controlling the main contactor to turn on / off according to the control of the RBMS. The BPU can also protect the batteries from short-circuit currents by using fuses in the event of a short circuit. Thus, a general-purpose battery system can be controlled by protective devices such as the BPU or switching devices.

[0064] Simultaneously, a Battery System Controller (BSC) 20 can be installed to monitor and control objects in each battery section, including multiple batteries, peripheral circuits, and devices, such as voltage, current, temperature, and circuit breakers. The Battery System Controller is the top-level controller for a library-level battery system comprising multiple battery racks and is also used as a controller in battery systems with multi-library architectures. Here, each library-level battery system may include a Library Battery Management System (BBMS), and the BBMS can monitor and control each rack by interfacing with the RBMS of the battery racks managed by the battery system.

[0065] Furthermore, the power conversion system (PCS) 40 installed in each battery section controls the charging and discharging of the batteries by controlling the power supplied from an external source and the power supplied from the battery section to the outside, and may include a DC / AC inverter. Additionally, if the ESS system is being connected to a photovoltaic (PV; solar power system) module field 70, a PV inverter may be included.

[0066] Simultaneously, the output of each BPU can be connected to PCS 40 via a DC bus, and PCS 40 is connected to the power grid 60. Furthermore, the Energy Management System (EMS) / Power Management System (PMS) 30 can control the energy storage system overall.

[0067] Figure 2 The structure of a universal battery holder is shown.

[0068] The battery rack may include a battery protection unit (BPU) and multiple battery packs. The BPU and multiple battery packs may be connected in a vertically stacked structure.

[0069] The BPU located at the top of the battery rack may include a circuit breaker (CB) and a rack BMS (RBMS).

[0070] RBMS can include a main contactor MC, fuse, microcontroller unit (MCU), memory, power supply unit and current sensor.

[0071] Each of the battery packs located below the BPU may include multiple batteries as well as a battery pack management system (PBMS) for monitoring and managing the batteries.

[0072] The batteries within each battery pack can be connected in series and / or in parallel and connected to power terminals located in the BPU, thereby connecting to a DC link.

[0073] Figure 3 This is a block diagram of a battery system according to an embodiment of the present invention.

[0074] refer to Figure 3 The battery system may include a battery protection device (BPU) 100 and multiple battery modules 200-1 to 200-n.

[0075] In this disclosure, battery assembly may refer to a battery pack, but the scope of the invention is not limited to these entities. For example, battery assembly may mean a battery module, a battery rack, or a battery bank.

[0076] Each of the battery modules 200-1 to 200-n may include multiple cells 210-1 to 210-n and a battery management system (BMS) for managing and controlling the cells. For example, a battery module may correspond to a battery pack and include multiple individual cell BMS and a battery pack BMS (PBMS).

[0077] Multiple batteries 210-1 to 210-n can be connected in series and / or in parallel to form a battery group. This battery group can be connected to the charging / discharging terminals provided on the BPU 100 and electrically connected to a DC link.

[0078] For example, such as Figure 3 As shown, multiple batteries 210-1 to 210-n can be connected in series with each other, and the positive and negative terminals of the uppermost battery assembly (200-1) can be connected to the positive charge / discharge terminal BP and the negative charge / discharge terminal BN of the BPU 100, respectively. Here, the positive charge / discharge terminal BP and the negative charge / discharge terminal BN can be electrically connected to the positive DC link terminal DP and the negative DC link terminal DN within the BPU 100, respectively. Therefore, a group of batteries 210-1 to 210-n connected in series with each other can be connected to the DC link.

[0079] The BPU 100 may include a circuit breaker (CB) and a battery management system (BMS).

[0080] A battery management system (BMS) may include a main contactor (MC), a fuse, a control unit, a power supply unit, a power holding unit, and a current sensor.

[0081] The battery management device may be an upper control device of the BMS included in each of the battery packs 200-1 to 200-n. For example, the battery management device included in the BPU may be a rack BMS (RBMS) that manages multiple battery packs.

[0082] The battery management device can monitor and manage battery modules 200-1 to 200-n.

[0083] Figure 4 This is a circuit diagram of a battery protection device according to an embodiment of the present invention.

[0084] refer to Figure 4 Multiple terminals can be disposed on the outer surface of the battery protection device 100. Here, the terminals may include a positive charging / discharging terminal BP, a negative charging / discharging terminal BN, a positive DC link terminal DP, and a negative DC link terminal DN.

[0085] The positive charging / discharging terminal BP and the negative charging / discharging terminal BN can be connected to the positive and negative terminals of a group of batteries 210, respectively.

[0086] The positive charging / discharging terminal BP can be connected to the positive DC link terminal DP via the positive line Lp, and the negative charging / discharging terminal BN can be connected to the negative DC link terminal DN via the negative line Ln.

[0087] The battery protection device 100 may include a circuit breaker 120 and a battery management device 110. Here, the battery management device 110 can manage the battery assembly and control the operation of the circuit breaker 120.

[0088] Circuit breaker 120 may be located on the battery's charging / discharging lines Lp and Ln. Here, circuit breaker 120 may include a positive disconnect switch CBp located on the positive line Lp and a negative disconnect switch CBn located on the negative line Ln.

[0089] The controller 111 of the battery management device 110 can monitor whether a predefined circuit breaker tripping event has occurred, and if such an event occurs, the controller 111 can switch the circuit breaker from a closed state to an open state. For example, if the current or temperature at a specific location within the battery system exceeds a threshold, the controller 111 can switch both the positive disconnect switch CBp and the negative disconnect switch CBn to the open state, thereby disconnecting the electrical connection between that group of batteries and the DC link.

[0090] The battery management device 110 may include a controller 111, a power supply unit 112, a power holding unit 113, a current sensor 114, a main contactor MC, and a pre-charge circuit (PC, Rpc).

[0091] The controller 111 can be operated by receiving power from the power supply unit 112, and can control the operation of the circuit breaker 120, the power holding unit 113, the main contactor MC, and the pre-charge switch PC.

[0092] The main contactor MC can be located on the positive line Lp, and the pre-charge switch PC and the pre-charge resistor Rpc can be connected in parallel with the main contactor MC.

[0093] The controller 111 can control the electrical connection between the battery pack and the DC link by controlling the on / off state of the main contactor MC and the precharge switch PC.

[0094] The current sensor 114 can be configured to measure the current flowing in the positive line Lp or the negative line Ln. For example, as Figure 4 As shown, the first shunt resistor R1 and the second shunt resistor R2 are arranged on the negative line Ln, and the current sensor 130 can measure the voltage across the first shunt resistor R1 and the voltage across the second shunt resistor R2 to calculate the current flowing through the first shunt resistor R1 and the second shunt resistor R2.

[0095] The power supply unit 112 can receive power from the battery and supply power to the controller 111.

[0096] When the circuit breaker 120 is disconnected, the power holding unit 113 can receive power from the battery and temporarily supply power to the power supply unit 112. Here, the power supply unit 112 can supply the temporary power supplied from the power holding unit 113 to the controller 111.

[0097] The power supply unit 112 can receive power from the battery via the first power supply line L1 and supply power to the controller 111. In addition, the power holding unit 113 can receive power from the battery via the second power supply line L2 and supply temporary power to the power supply unit 112.

[0098] For example, refer to Figure 4 The power supply unit 112 may include a first power input terminal 1, a second power input terminal 2, a grounding terminal 3, and a first power output terminal 4.

[0099] One end of the first power supply line L1 can be connected between the positive disconnect switch CBp and the main contactor MC, and the other end of the first power supply line L1 can be connected to the first power input terminal 1 of the power supply unit 112.

[0100] In addition, one end of the second power supply line L2 can be connected between the positive charging / discharging terminal BP, which serves as the output terminal of the battery, and the positive cut-off switch CBp, and the other end of the second power supply line L2 can be connected to the second power input terminal 2 of the power supply unit 112.

[0101] The power holding unit 113 can be installed on the second power supply line L2 and includes a power holding switch. Here, the controller 111 can control whether to supply temporary power to the power supply unit 112 by controlling the on / off state of the power holding switch.

[0102] One end of the grounding wire Lgrd can be connected to the negative charging / discharging terminal BN and the negative disconnecting switch CBn, and the other end of the grounding wire Lgrd can be connected to the grounding terminal 3 of the power supply unit 112.

[0103] The first power output terminal 4 of the power supply unit 112 can be electrically connected to the controller 111, and can convert the power supplied through the first power supply line L1 or the second power supply line L2 into a set voltage and supply it to the controller 111.

[0104] When a predefined circuit breaker tripping event occurs, controller 111 can control power holding unit 113 to switch the second power supply line L2 to an active state. For example, if the current or temperature at a specific location within the battery system exceeds a threshold, controller 111 can switch the power holding switch included in power holding unit 113 from an open state to a closed state, thereby activating the second power supply line L2. Therefore, power output from the battery can be supplied to power supply unit 112 via the second power supply line L2.

[0105] When the second power supply line L2 is activated, the controller 111 can switch the circuit breaker 120 to the open state.

[0106] Subsequently, controller 111 can deactivate the second power supply line L2 after a predetermined time period has elapsed or a predetermined power-off sequence has been completed. For example, when 20 seconds have elapsed since circuit breaker 120 was switched to the open state, controller 111 can switch the power holding switch from the closed state to the open state to cut off the temporary power supply to power supply unit 112. As another example, when circuit breaker 120 has been switched to the open state, controller 111 can execute a power-off sequence, including internal component status checks, data storage operations, and internal component shutdown state switching operations. When the power-off sequence is completed, controller 111 can switch the power holding switch from the closed state to the open state to cut off the temporary power supply to power supply unit 112.

[0107] Figure 5 This is a circuit diagram of a power holding unit according to an embodiment of the present invention.

[0108] refer to Figure 5 The power holding unit 113 may include a MOSFET 1131, an optocoupler 1132, and a voltage supply switch (PH).

[0109] MOSFET 1131 is located on the second power supply line L2 and can be turned on and off under the control of controller 111. Here, when MOSFET 1131 is turned on (closed state), the second power supply line L2 can be activated, and when MOSFET 1131 is turned off (open state), the second power supply line L2 can be deactivated. In other words, MOSFET 1131 can correspond to a power holding switch.

[0110] The optocoupler 1132 can apply a gate voltage to the MOSFET 1131 under the control of the controller 111. When a gate voltage is applied to the MOSFET 1131, the MOSFET 1131 can be switched from the off state to the on state.

[0111] The optocoupler 1132 may include a first output terminal 1, a second output terminal 2, a first input terminal 3, and a second input terminal 4.

[0112] The light receiving element can be arranged between the first output terminal 1 and the second output terminal 2, and the light emitting element can be arranged between the first input terminal 3 and the second input terminal 4.

[0113] The first output terminal 1 can be connected to the gate terminal of MOSFET 1131, and the second output terminal 2 can be connected to the source terminal of MOSFET 1131. Additionally, the first input terminal 3 can be connected to the operating voltage supply line Lv, and the second input terminal 4 can be connected to the ground line Lgrd of the power supply unit 112.

[0114] One end of the operating voltage supply line Lv can be connected to the first input terminal 3 of the optocoupler 1132, and the other end of the operating voltage supply line Lv can be connected to the second power output terminal 5 of the power supply unit 112. In other words, the light-emitting element of the optocoupler 1132 can receive the operating voltage from the power supply unit 112 to emit light.

[0115] The voltage supply switch PH is located on the operating voltage supply line Lv and can be turned on / off by the controller 111.

[0116] When a predefined circuit breaker tripping event occurs, controller 111 can switch the voltage supply switch PH from the open state to the closed state. Therefore, optocoupler 1132 applies a gate voltage to MOSFET 1131, switching MOSFET 1131 from the off state to the on state, thereby activating the second power supply line L2. Thus, temporary power can be supplied to power supply unit 112.

[0117] When the second power supply line L2 is activated, the controller 111 can switch the circuit breaker 120 to the open state.

[0118] Subsequently, when the predetermined time period has elapsed or the predetermined power outage sequence has been completed, the controller 111 can switch the voltage supply switch PH from the closed state to the open state, thereby switching the second power supply line L2 to the inactive state. Therefore, the temporary power supply to the power supply unit 112 can be cut off.

[0119] Figure 6 This is a flowchart illustrating an operation method of a battery system according to an embodiment of the present invention, and Figure 7 and Figure 8 This is a reference diagram used to illustrate the operation method of a battery system according to an embodiment of the present invention.

[0120] When the battery system's operating mode is activated (S610), the power supply unit 112 can receive power from the battery via the first power supply line L1, such as... Figure 7 As shown in the diagram, power is supplied to the controller 111. Here, the power holding switch included in the power holding device 113 can be kept in the off state (disconnected state), and therefore, the second power supply line L2 can be kept in the inactive state.

[0121] Controller 111 can monitor whether a predefined circuit breaker tripping event has occurred (S620). For example, controller 111 can collect battery state values ​​from a lower-level BMS and determine whether a specific state value exceeds a predefined threshold. If a specific state value exceeds the predefined threshold, controller 111 can determine that a circuit breaker tripping event has occurred.

[0122] If a circuit breaker tripping event occurs (yes in S620), the controller 111 can control the power holding device 113 to switch the second power supply line L2 to the active state (S630).

[0123] Here, controller 111 can switch the power holding switch located on the second power supply line L2 from the open state to the closed state, thereby switching the second power supply line L2 to the active state. For example, controller 111 can... Figure 5The voltage supply switch (PH) shown switches from an open state to a closed state. Therefore, the optocoupler 1132 applies a gate voltage to the MOSFET 1131, causing the MOSFET 1131 to switch from an off state to an on state, thereby activating the second power supply line L2. Thus, as... Figure 8 As shown, the power supply unit 112 can receive power from the battery and supply power to the controller 111 via the second power supply line L2.

[0124] After the second power supply line L2 is activated, the controller 111 can switch the circuit breaker 120 located on the battery charging / discharging line to the open state (S640).

[0125] Subsequently, controller 111 can determine whether a predefined power disconnection condition is met (S650). Here, the power disconnection condition may include one or more of a first condition and a second condition, where a predefined time period has elapsed since circuit breaker 120 was switched off, and a predefined power disconnection sequence has been completed in the second condition. For example, controller 111 can determine whether 20 seconds have elapsed since circuit breaker 120 was switched off, or whether the predefined power disconnection sequence has been fully executed since circuit breaker 120 was switched off.

[0126] If the power disconnection condition is met (yes in S650), the controller 111 can control the power holding unit 113 to disable the second power supply line L2 (S660). For example, the controller 111 can do so by... Figure 5 The voltage supply switch (PH) shown is switched from the closed state to the open state to deactivate the second power supply line L2. Therefore, the temporary power supply to the power supply unit 112 is cut off, and consequently, the power supply to the controller 111 can also be interrupted.

[0127] Figure 9 This is a block diagram of a controller according to an embodiment of the present invention.

[0128] According to an embodiment of the present invention, the controller 900 may be included in a battery management device located between a circuit breaker and a DC link disposed on a battery charging / discharging line.

[0129] Here, the battery management device may include: a power supply unit that receives power from the battery via a first power supply line and supplies power to the controller 900; and a power holding device that receives power from the battery via a second power supply line and temporarily supplies power to the power supply unit.

[0130] The controller 900 may include at least one processor 910, a memory 920 storing at least one instruction executed by the processor, and a transceiver 930 connected to a network and performing communication.

[0131] At least one instruction may include: an instruction for monitoring whether a predefined circuit breaker disconnection event has occurred; an instruction for controlling a power holding device to switch the second power supply line from a deactivated state to an activated state when the circuit breaker disconnection event occurs; and an instruction for disconnecting a circuit breaker located on the battery's charging / discharging line after the second power supply line has been activated.

[0132] At least one instruction may also include an instruction to deactivate the second power supply line if a predetermined time period has elapsed after the circuit breaker has been switched to the open state or a predetermined power outage sequence has been completed.

[0133] Instructions for activating a second power supply line from a deactivated state may include instructions for activating the second power supply line by switching a power holding switch installed on the second power supply line from an open state to a closed state.

[0134] The power holding device may include: a MOSFET disposed on a second power supply line; an optocoupler that applies a gate voltage to the MOSFET; and a voltage supply switch disposed on the path supplying an operating voltage to the optocoupler. Here, the instruction for activating the second power supply line from a deactivated state may include an instruction for activating the second power supply line by switching the voltage supply switch from an open state to a closed state.

[0135] The controller 900 may also include an input interface device 940, an output interface device 950, a storage device 960, etc. The various components included in the controller 900 can be connected to and communicate with each other via a bus 970.

[0136] Here, processor 910 may refer to a central processing unit (CPU), graphics processing unit (GPU), or dedicated processor on which the methods according to embodiments of the present invention are executed. Furthermore, the memory may include at least one of volatile / temporary storage media and non-volatile / non-temporary storage media. For example, the memory may include at least one of read-only memory (ROM) and random access memory (RAM), and may include electrically erasable programmable read-only memory (EEPROM).

[0137] The operation of the method according to embodiments of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes all types of recording devices in which computer systems store data readable by the computer. Furthermore, the computer-readable recording medium can be distributed across network-connected computer systems to store and execute computer-readable programs or code in a distributed manner.

[0138] The operation of the method according to embodiments of the present invention can be implemented in various forms related to the program—such as computer programs or code itself or computer program products.

[0139] In addition, computer-readable recording media may include one or more of volatile / temporary recording media and non-volatile / non-temporary recording media.

[0140] Furthermore, computer-readable recording media can include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory, and can include, for example, various types of servers located on a network. Program instructions can include not only machine language code, such as machine language code created by a compiler, but also high-level language code that can be executed by a computer using an interpreter.

[0141] Although some aspects of the invention have been described in the context of apparatus, they may also refer to, according to the description of the corresponding method, a block or apparatus corresponding to a method step or feature of a method step. Similarly, aspects described in the context of a method may also refer to features of a corresponding block or item or a corresponding apparatus. Some or all of the method steps may be performed by (or using) hardware devices such as, for example, microprocessors, programmable computers, or electronic circuits. In some embodiments, one or more of the most important method steps may be performed by such apparatus.

[0142] In the foregoing, the present invention has been described with reference to exemplary embodiments thereof. However, those skilled in the art will understand that various corrections and modifications may be made to the invention within the scope of the appended claims without departing from the spirit and scope of the invention as described therein.

Claims

1. A battery system, comprising: Battery; A circuit breaker located on the charging / discharging line of the battery; as well as A battery management device configured to manage the battery and control the operation of the circuit breaker. The battery management device includes: Controller; A power supply unit configured to receive power from the battery via a first power supply line and supply power to the controller; and A power retention device configured to receive power from the battery via a second power supply line and to supply temporary power to the power supply unit when the circuit breaker is open.

2. The battery system according to claim 1, wherein, The controller controls the power holding device to activate the second power supply line when a predefined circuit breaker disconnection event occurs.

3. The battery system according to claim 2, wherein, The controller switches the circuit breaker to the open state after the second power supply line is activated, and switches the second power supply line to the inactive state when a predetermined time period has elapsed or a predetermined power outage sequence has been completed.

4. The battery system according to claim 1, wherein, The first power supply line has one end connected between the circuit breaker and the main contactor located on the charging / discharging line, and the other end connected to the first power input terminal of the power supply unit.

5. The battery system according to claim 4, wherein, The second power supply line has one end connected between the output terminal of the battery and the circuit breaker, and the other end connected to the second power input terminal of the power supply unit.

6. The battery system according to claim 1, wherein, The power holding device includes a power holding switch installed on the second power supply line, and When a predefined circuit breaker tripping event occurs, the controller switches the power holding switch from the open state to the closed state, thereby switching the second power supply line to the active state.

7. The battery system according to claim 1, wherein, The power retention device includes: MOSFET, the MOSFET being disposed on the second power supply line; An optocoupler that applies a gate voltage to the MOSFET; and A voltage supply switch is disposed on the path that supplies the operating voltage to the optocoupler, and When a predefined circuit breaker tripping event occurs, the controller switches the voltage supply switch from the open state to the closed state, thereby switching the second power supply line to the active state.

8. The battery system according to claim 7, wherein, The optocoupler receives the operating voltage from the power supply unit.

9. A method for operating a battery system via a battery management device, the battery management device comprising: Controller; A power supply unit configured to receive power from a battery via a first power supply line and supply power to the controller; And a power retention device configured to receive power from the battery via a second power supply line and supply temporary power to the power supply unit, the method comprising: Monitor whether a predefined circuit breaker tripping event occurs; If the circuit breaker trips, the power holding device is controlled to switch the second power supply line from a deactivated state to an activated state; and After the second power supply line is activated, the circuit breaker on the battery's charging / discharging line is switched to the open state.

10. The method of claim 9, further comprising: If a predetermined time period has elapsed or a predetermined power outage sequence has been completed after the circuit breaker is switched to the open state, the second power supply line is switched to the off state.

11. The method according to claim 9, wherein, Switching the second power supply line from a disabled state to an active state includes: Switching the power holding switch on the second power supply line from the open state to the closed state activates the second power supply line.

12. The method according to claim 9, wherein, The power retention device includes: MOSFET, the MOSFET being disposed on the second power supply line; An optocoupler that applies a gate voltage to the MOSFET; and A voltage supply switch is disposed on the path that supplies the operating voltage to the optocoupler, and Switching the second power supply line from a deactivated state to an activated state includes: Switching the voltage supply switch from the off state to the closed state activates the second power supply line.

13. A battery management device located between a circuit breaker and a DC link on a battery charging / discharging line, the battery management device comprising: Controller; A power supply unit configured to receive power from the battery via a first power supply line and supply power to the controller; as well as A power retention device configured to receive power from the battery via a second power supply line and to supply temporary power to the power supply unit when the circuit breaker is open.

14. A computer-readable medium having a program recorded thereon for performing the method according to any one of claims 9 to 12 on a computer.

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