Battery system and battery system operation method

Abstract

The battery system of the present invention is a battery system located within an electric vehicle, and includes a main battery; a battery management device that controls the main battery to cut off power supply when an abnormality occurs in one or more components included in the electric vehicle; and an auxiliary battery that is provided separately from the main battery and supplies power to one or more components that are configured in a cooling system for cooling the main battery.

Description

[Technical Field]

[0001] This application is based on and claims priority from Korean Patent Application No. 10-2023-0098137, filed with the Korean Intellectual Property Office on July 27, 2023, the contents of which are incorporated herein by reference in their entirety.

[0002] The present invention relates to a battery system and a method for operating a battery system. [Background technology]

[0003] Secondary batteries are batteries that can be reused by recharging after discharge and can be used as energy sources for small devices such as mobile phones, tablet PCs, and vacuum cleaners, as well as medium- to large-sized devices such as automobiles and smart grid ESS (Energy Storage Systems).

[0004] Secondary batteries are applied to systems in the form of assemblies such as battery modules in which multiple battery cells are connected in series and parallel, or battery packs in which battery modules are connected in series and parallel, depending on the requirements of the system. In the case of medium to large devices such as electric vehicles, high-capacity battery systems in which multiple battery packs are connected in parallel can be applied to meet the required capacity of the device.

[0005] In electric vehicles equipped with such high-capacity battery systems, efforts are ongoing to ensure the stability of the battery system even under various abnormal conditions, such as abnormally high battery temperatures (see Korean Patent Publication No. 2020-0006404). Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a battery system that can improve the temperature stability of the battery even when an abnormal state occurs.

[0007] The present invention provides a method for operating such a battery system. [Means for solving the problem]

[0008] A battery system according to one embodiment of the present invention is a battery system located in an electric vehicle, and may include a main battery; a battery management device that controls the main battery to cut off power supply when an abnormality occurs in one or more components included in the electric vehicle; and an auxiliary battery that is provided separately from the main battery and supplies power to one or more components configured in a cooling system for cooling the main battery when the power supply from the main battery is cut off.

[0009] The auxiliary battery may be configured to supply power to a refrigerant circulation unit that circulates the refrigerant in a refrigerant circulation flow path, and the main battery may be configured to supply power to the cooling system, and the auxiliary battery may be configured to supply power only to the refrigerant circulation unit configured in the cooling system when power supply from the main battery is cut off.

[0010] The cooling system may include a refrigerant circulation channel through which a refrigerant flows, a heat exchange unit that cools the refrigerant, and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation channel. Here, the auxiliary battery may be configured to supply power to the refrigerant circulation pump when power supply from the main battery is cut off.

[0011] When an abnormality occurs in one or more components, the heat exchange unit may be cut off from power supply from the main battery. Here, the refrigerant circulation pump may be operated using power supplied from the auxiliary battery, allowing the refrigerant to circulate within the refrigerant circulation path without being cooled by the heat exchange unit.

[0012] The auxiliary battery may be a battery that exhibits an output voltage lower than the output voltage of the main battery.

[0013] When an abnormality occurs in one or more components, the battery management device can switch the main relay arranged on the output side power supply path of the main battery from a closed state to an open state, and control one or more components configured in the cooling system to operate using power supplied by the auxiliary battery.

[0014] The battery management device diagnoses whether an abnormality has occurred in the battery system in the driving mode of the electric vehicle or the charging mode of the main battery, and if an abnormality is detected, controls the main battery to cut off power supply and the auxiliary battery to allow power supply.

[0015] The battery management device is activated at predetermined time intervals in the parking mode of the electric vehicle or the sleep mode of the battery system to diagnose whether an abnormality has occurred in the battery system, and if an abnormality is detected, the battery management device may control the main battery to maintain a power supply cut-off state and allow power supply from the auxiliary battery.

[0016] A method for operating a battery system according to another embodiment of the present invention is a method for operating a battery system by a battery management device located in an electric vehicle, and includes the steps of: diagnosing whether an abnormality has occurred in the battery system; if an abnormality is detected, controlling the main battery to cut off power supply; and, if the main battery cuts off power supply, controlling an auxiliary battery provided separately from the main battery to supply power to one or more components configured in a cooling system for cooling the main battery.

[0017] The step of controlling the supply of power to one or more components configured in the cooling system may include a step of controlling the auxiliary battery to supply power to a refrigerant circulation unit that circulates refrigerant within a refrigerant circulation flow path.

[0018] The main battery may be configured to supply power to the cooling system, and the auxiliary battery may be configured to supply power only to a refrigerant circulation unit configured in the cooling system when power supply from the main battery is cut off.

[0019] The cooling system may include a refrigerant circulation channel through which a refrigerant flows, a heat exchange unit that cools the refrigerant, and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation channel. Here, controlling one or more components configured in the cooling system to supply power may include controlling the auxiliary battery to supply power to the refrigerant circulation pump.

[0020] The step of controlling the main battery to cut off power supply may include the step of controlling the main battery to cut off power supply to the heat exchange unit. Here, the step of controlling the auxiliary battery to supply power to the refrigerant circulation pump may include the step of operating the refrigerant circulation pump using power supplied by the auxiliary battery so that the refrigerant circulates within the refrigerant circulation path without being cooled by the heat exchange unit.

[0021] The auxiliary battery may be a battery that exhibits an output voltage lower than the output voltage of the main battery.

[0022] The step of controlling the main battery to cut off power supply may include switching a main relay disposed on an output power supply path of the main battery from a closed state to an open state, and the step of controlling the supply of power to the one or more components may include controlling the one or more components to operate using power supplied by the auxiliary battery.

[0023] The step of diagnosing whether or not an abnormality has occurred in the battery system may include diagnosing whether or not an abnormality has occurred in the battery system in a driving mode of the electric vehicle or a charging mode of the main battery.

[0024] The step of diagnosing whether an abnormality has occurred in the battery system may include a step of being activated at predetermined time intervals in a parking mode of the electric vehicle or a sleep mode of the battery system to diagnose whether an abnormality has occurred in the battery system.

[0025] A battery system according to yet another embodiment of the present invention is a battery system located within an electric vehicle, and includes: a main battery that supplies power to the electric vehicle; a battery management device that controls the main battery to cut off power supply when an abnormality occurs in one or more components included in the electric vehicle; and an auxiliary battery that is provided separately from the main battery and is designed to directly supply power only to specific components among one or more components that constitute a cooling system for cooling the main battery when power supply from the main battery is cut off, and not to supply power to the remaining components of the cooling system.

[0026] The cooling system includes a refrigerant circulation flow path through which a refrigerant flows; a heat exchange unit that cools the refrigerant; and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation flow path, and the auxiliary battery can be configured to directly supply power only to the refrigerant circulation pump of the cooling system when power supply from the main battery is cut off. [Effects of the Invention]

[0027] According to the above-described embodiment of the present invention, even if the output of the main battery is cut off due to an abnormal state of the battery system, at least a portion of the function of the cooling system can be activated by the auxiliary battery, thereby improving the temperature stability of the battery. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a block diagram of a battery system according to an embodiment of the present invention. [Figure 2] FIG. 4 is a block diagram of a battery system according to another embodiment of the present invention. [Figure 3] 1 is a reference diagram for explaining a cooling system according to an embodiment of the present invention. [Figure 4] FIG. 2 is an operational flow diagram of a method for operating a battery system according to an embodiment of the present invention. [Figure 5] FIG. 10 is an operational flow diagram of a method for operating a battery system according to another embodiment of the present invention. [Figure 6] FIG. 10 is an operational flow diagram of a method for operating a battery system according to yet another embodiment of the present invention. [Figure 7] 1 is a block diagram of a battery management device according to an embodiment of the present invention;

[0029] In some of the accompanying drawings, corresponding components are designated by the same reference numerals. Those skilled in the art will appreciate that the drawings illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to facilitate understanding of the various embodiments, the dimensions of some elements illustrated in the drawings may be exaggerated relative to other elements. Furthermore, elements of the publicly known art that are useful or essential in commercially viable embodiments may often not be depicted in order to avoid detracting from the spirit of the various embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, it is understood that this is not intended to limit the present invention to the specific embodiments, but rather to include all modifications, equivalents, or alternatives within the spirit and technical scope of the present invention. Like reference numerals are used to refer to like elements throughout the drawings.

[0031] Terms such as "first," "second," "A," and "B" may be used to describe various components, but the components should not be limited by these terms. These terms are used only to distinguish one component from another. For example, a first component may be termed a "second component," and similarly, a second component may be termed a "first component," without departing from the scope of the present invention. The term "and / or" includes a combination of multiple associated listed items or any of multiple associated listed items.

[0032] When a component is referred to as being "coupled" or "connected" to another component, it is understood that the component may be directly coupled or connected to the other component, but that there may be other components in between. Conversely, when a component is referred to as being "directly coupled" or "directly connected" to another component, it is understood that there are no other components in between.

[0033] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless the context clearly indicates otherwise. It should be understood that in this application, the terms "comprise" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not preclude the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0034] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted as having an ideal or overly formal meaning unless expressly defined in this application.

[0035] If a predefined abnormal state is detected in the battery system while the electric vehicle is running or the battery is being charged, a relay disposed on the output side of the battery may be switched to an open state to cut off charging and discharging power to the battery. Generally, a battery cooling system for maintaining the temperature stability of a battery operates by receiving power from the battery, but if the battery power supply is cut off due to the relay being open, the battery cooling function is also interrupted.

[0036] The present invention proposes an appropriate battery protection technology that can improve the temperature stability of the battery even when an abnormal state occurs in the battery system, causing the relay located on the output side of the battery to switch to an open state and blocking the charge / discharge path.

[0037] Some terms used in this specification are defined as follows:

[0038] A battery cell is the smallest unit that serves to store power, and a battery module refers to an assembly of a plurality of battery cells that are electrically connected together.

[0039] A battery pack or battery rack refers to the smallest single structure system that can be monitored and controlled through a BMS (Battery Management System) by electrically connecting module units set by the battery manufacturer, and can be composed of multiple battery modules and one BPU (Battery Protection Unit) or protection device.

[0040] A battery bank can refer to a large-scale battery rack system consisting of multiple battery racks connected in parallel. The battery bank BMS can monitor and control the battery rack BMS (RBMS).

[0041] A battery assembly refers to an assembly including a plurality of electrically connected battery cells that is applied to a specific system or device and functions as a power supply source. Here, the battery assembly may refer to a battery module, a battery pack, a battery rack, a battery bank, or the like, but the scope of the present invention is not limited to these.

[0042] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] 1 and 2 are block diagrams of a battery system according to an embodiment of the present invention.

[0044] Referring to FIG. 1, the battery system may include a main battery 110, an auxiliary battery 120, and a battery management unit 200.

[0045] The main battery 110 may be configured to supply power to a power requesting device 300 located in the electric vehicle. Here, the power requesting device 300 may include a drive unit 310 of the electric vehicle and a cooling system 320. The power requesting device 300 may also include various components for operating the electric vehicle in addition to the drive unit 310 and the cooling system 320. The cooling system 320 according to an embodiment of the present invention may include a refrigerant circulation channel 321 through which a refrigerant flows, a heat exchange unit 322 that cools the refrigerant, and a refrigerant circulation pump 323 that circulates the refrigerant within the refrigerant circulation channel 321.

[0046] The auxiliary battery 120 may be configured to supply power to one or more components configured in the cooling system 320. Here, the auxiliary battery 120 may be configured to supply power to activate at least some functions of the cooling system 320. In an embodiment, the auxiliary battery 120 may be configured to supply power to a refrigerant circulation unit that circulates the refrigerant in the refrigerant circulation channel 321.

[0047] The main relay 410 is disposed on the output side power supply path of the main battery 110 and is configured to electrically connect or disconnect the main battery 110 and the power requesting device 300. Here, the main relay 410 can be on / off controlled by the battery management device 200.

[0048] The auxiliary relay 420 is disposed on the output power supply path of the auxiliary battery 120 and can be configured to electrically connect or disconnect the auxiliary battery 120 and specific components of the cooling system 320. Here, the auxiliary relay 420 can be turned on and off under the control of the battery management unit 200.

[0049] 2, the auxiliary battery 120 may be configured to be directly connected to a specific component of the cooling system 320, for example, a refrigerant circulation pump 323. Here, the refrigerant circulation pump 323, which is a component connected to the auxiliary battery 120, may be on / off controlled by the battery management device 200.

[0050] In the present invention, the main battery 110 and the auxiliary battery 120 may refer to battery cells or battery assemblies.

[0051] The auxiliary battery 120 according to one embodiment may be a battery that exhibits an output voltage lower than the output voltage of the main battery 110 .

[0052] The battery management device 200 may correspond to a battery management system (BMS) located within the battery system, or may be configured to be included in the BMS.

[0053] The battery management unit 200 can control the on / off operation of the main relay 410 to control the power supply from the main battery 110. For example, the battery management unit 200 can control the main relay 410 to a closed state so that the stored power of the main battery 110 is supplied to the power requesting device 300, and can control the main relay 410 to an open state so that the power supply from the main battery 110 is cut off.

[0054] The battery management unit 200 can control the on / off operation of the auxiliary relay 420 to control the power supply from the auxiliary battery 120. For example, the battery management unit 200 can control the auxiliary relay 420 to a closed state so that the stored power of the auxiliary battery 120 is supplied to the cooling system 320 or a specific component of the cooling system 320, such as the refrigerant circulation pump 323, and can control the auxiliary relay 420 to an open state so that the power supply from the auxiliary battery 120 to the cooling system 320 or a specific component of the cooling system 320, such as the refrigerant circulation pump 323, is cut off.

[0055] According to an embodiment, the battery management device 200 can diagnose whether an abnormality has occurred in the battery system. Here, the battery management device 200 can collect status information of the battery system through one or more sensors and determine whether a predefined abnormality has occurred in the battery system based on the collected status information. For example, the battery management device 200 can determine whether an abnormality such as overheating, high voltage, high current, short circuit, arc, or venting has occurred in the battery system.

[0056] The battery management device 200 according to an embodiment may be configured to receive information about an abnormal state of an external component of the battery system from the diagnostic unit of the electric vehicle.

[0057] When an abnormality occurs in the battery system or the electric vehicle, the battery management device 200 can control the power supply from the main battery 110 to be cut off, and can control one or more components configured in the cooling system 320 to operate using power supplied by the auxiliary battery 120.

[0058] For example, when a predefined abnormal state is detected in the battery system, the battery management device 200 can switch the main relay 410 from a closed state to an open state and the auxiliary relay 420 from an open state to a closed state. As a result, the power supply from the main battery 110 to the power requesting device 300 is cut off, and at least some functions of the cooling system 320, for example, only the refrigerant circulation pump 323, can be activated by the auxiliary battery 120. At this time, since the power supply to the heat exchange unit 322 is cut off, the refrigerant (C) can circulate within the refrigerant circulation path 321 without being cooled by the heat exchange unit 322.

[0059] On the other hand, if the auxiliary battery 120 is configured to be directly connected to a specific component of the cooling system 320, such as the refrigerant circulation pump 323, the battery management device 200 can switch the main relay 410 from a closed state to an open state, and switch the power supply path to the corresponding component so that the corresponding component operates using power supplied by the auxiliary battery 120 rather than the main battery 110.

[0060] FIG. 3 is a reference diagram for explaining a cooling system 320 according to an embodiment of the present invention.

[0061] 3, the cooling system 320 may include a refrigerant circulation channel 321 through which a refrigerant C circulates. According to an embodiment, the refrigerant C may be cooling water.

[0062] A cooling plate (P) is configured to be in contact with at least a portion of the outer surface of the main battery 110, and a portion of the refrigerant circulation channel 321 may be accommodated inside the cooling plate (P). Here, the refrigerant (C) flows inside the cooling plate (P) and can absorb heat generated from the main battery 110. In one embodiment, the cooling plate (P) may be a heat exchange unit 322.

[0063] The cooling system 320 can reduce the temperature of the refrigerant (C) through the heat exchange unit 322. Here, the heat exchange unit 322 can reduce the temperature of the first refrigerant (C) by allowing the first refrigerant (C) for cooling the main battery 110 to exchange heat with a second refrigerant having a lower temperature than the first refrigerant (C).

[0064] The refrigerant circulation pump 323 is disposed on the flow path of the refrigerant (C) and can apply a certain pressure to the refrigerant (C) so that the refrigerant (C) circulates in a specific direction within the refrigerant circulation flow path 321.

[0065] 2, the auxiliary battery 120 may be configured to supply power to a refrigerant circulation pump 323 configured in the cooling system 320. Here, the auxiliary battery 120 may be configured to supply power only to the refrigerant circulation pump 323, without supplying power to other components such as the heat exchange unit 322.

[0066] The auxiliary battery 120 may be a battery that exhibits an output voltage lower than the output voltage of the main battery 110. For example, the auxiliary battery 120 may be a 12V lead-acid battery or a 48V low-voltage battery for activating only the refrigerant circulation function of the cooling system 320.

[0067] According to an embodiment of the present invention, when the output of the main battery 110 is shut off due to the occurrence of an abnormal condition, the battery cooling function is deactivated, but the refrigerant circulation function can be activated by the auxiliary battery 120, which is a low-voltage battery. This allows the temperature of the main battery 110 to stabilize for a certain period of time, thereby preventing or delaying the occurrence of additional abnormal conditions.

[0068] FIG. 4 is an operational flow diagram of a method for operating a battery system according to an embodiment of the present invention.

[0069] The method for operating a battery system according to an embodiment of the present invention can be performed by a battery management device 200 located in an electric vehicle.

[0070] Furthermore, the method for operating a battery system according to an embodiment of the present invention may be performed in a driving mode of an electric vehicle or a charging mode of a main battery.

[0071] The battery management unit 200 may diagnose whether an abnormality has occurred in the battery system (S410). Here, the battery management unit 200 may collect status information of the battery system through one or more sensors and determine whether a predefined abnormality has occurred based on the collected status information. The battery management unit 200 may also receive abnormality status information for external components of the battery system from a diagnostic unit of the electric vehicle.

[0072] The battery management unit 200 checks whether a predefined abnormal state has occurred (S420), and if the abnormal state has occurred, it can control the main battery 110 to cut off the power supply (S430). Here, the battery management unit 200 can switch the main relay 410, which is arranged on the output side power supply path of the main battery 110, from a closed state to an open state to cut off the output of the main battery 110.

[0073] The battery management unit 200 may control the cooling system 320 so that some functions are activated through the power of the auxiliary battery 120 (S440).

[0074] For example, the battery management device 200 can control one or more components configured in the cooling system 320 to operate using power supplied by the auxiliary battery 120, thereby activating at least some functions of the cooling system 320.

[0075] FIG. 5 is an operational flow diagram of a method for operating a battery system according to another embodiment of the present invention.

[0076] The battery management unit 200 may diagnose whether an abnormality has occurred in the battery system (S510). Here, the battery management unit 200 may collect status information of the battery system through one or more sensors and determine whether a predefined abnormality has occurred based on the collected status information. The battery management unit 200 may also receive abnormality status information for external components of the battery system from a diagnostic unit of the electric vehicle.

[0077] The battery management device 200 checks whether a predefined abnormal state has occurred (S520), and if the abnormal state has occurred, controls to cut off the power supply from the main battery 110 (S530). Here, the heat exchange unit 322 of the battery cooling system 320 is configured to operate by receiving power from the main battery 110, so that the battery cooling function can be stopped.

[0078] The battery management device 200 can control the cooling system 320 so that only the refrigerant circulation function is maintained through the power of the auxiliary battery 120 (S540).

[0079] For example, the auxiliary battery 120 may be configured to supply power to a refrigerant circulation unit (e.g., refrigerant circulation pump 323) configured in the cooling system 320. Here, even if an abnormal state occurs and the output of the main battery 110 is cut off, the refrigerant circulation unit can operate using power from the auxiliary battery 120, thereby maintaining the refrigerant circulation function. At this time, since the power supply to the heat exchange unit 322 is cut off, the refrigerant can circulate within the refrigerant circulation path 321 without being cooled by the heat exchange unit 322.

[0080] According to an embodiment of the present invention, when the output of the main battery 110 is shut off due to the occurrence of an abnormal condition, the battery cooling function is deactivated, but the refrigerant circulation function can be activated by the auxiliary battery 120, which is a low-voltage battery. This allows the temperature of the main battery 110 to stabilize for a certain period of time, thereby preventing or delaying the occurrence of additional abnormal conditions.

[0081] FIG. 6 is a flowchart illustrating an operation of a battery system operating method according to still another embodiment of the present invention.

[0082] A method for operating a battery system according to yet another embodiment of the present invention may be performed in a parking mode of an electric vehicle or a sleep mode of the battery system.

[0083] When the electric vehicle is switched to a parking mode or the battery system is switched to a sleep mode (S610), the battery management unit 200 can switch the main relay 410 from a closed state to an open state (S620), thereby cutting off the output of the main battery 110.

[0084] Thereafter, the battery management device 200 is activated at predetermined time intervals to check whether an abnormality has occurred in the battery system and the electric vehicle (S630).

[0085] If a predefined abnormal state occurs, the battery management unit may maintain the power supply cut-off state of the main battery 110 (S640). For example, even if the electric vehicle is switched from parking mode to driving mode or the sleep mode of the battery system is released, the battery management unit 200 may prevent the main relay 410 from being switched to a closed state and may maintain the main relay 410 in an open state.

[0086] In addition, the battery management device 200 can activate the refrigerant circulation function of the cooling system 320 by controlling the refrigerant circulation unit (e.g., the refrigerant circulation pump 323) to operate using power from the auxiliary battery 120 (S650). As a result, even when an abnormal state occurs, the refrigerant circulation function is activated by the auxiliary battery 120, and the temperature of the main battery 110 can be stabilized for a certain period of time.

[0087] FIG. 7 is a block diagram of a battery management device 200 according to an embodiment of the present invention.

[0088] The battery management device 200 according to an embodiment of the present invention may correspond to a battery management system (BMS) located in a battery system, or may be configured to be included in the BMS.

[0089] The battery management device 200 may include at least one processor 210, a memory 220 that stores at least one instruction executed by the processor, and a transceiver 230 that is connected to a network for communication.

[0090] The at least one command may include a command to diagnose whether an abnormality has occurred in the battery system; a command to control the main battery 110 to cut off power supply if an abnormality is detected; and a command to control the auxiliary battery 120, which is provided separately from the main battery 110, to supply power to one or more components configured in a cooling system 320 for cooling the main battery 110.

[0091] The command to control the supply of power to one or more components configured in the cooling system 320 may include a command to control the auxiliary battery 120 to supply power to a refrigerant circulation unit, such as a refrigerant circulation pump 323, that circulates the refrigerant within the refrigerant circulation path 321.

[0092] The main battery 110 is configured to supply power to the cooling system 320, and the auxiliary battery 120 can be configured to supply power only to a refrigerant circulation unit, such as a refrigerant circulation pump 323, configured in the cooling system 320 when power supply from the main battery 110 is cut off.

[0093] The cooling system 320 may include a refrigerant circulation channel 321 through which a refrigerant flows, a heat exchange unit 322 that cools the refrigerant, and a refrigerant circulation pump 323 that circulates the refrigerant within the refrigerant circulation channel. Here, the command to control power supply to one or more components configured in the cooling system 320 may include a command to control the auxiliary battery 120 to supply power to the refrigerant circulation pump 323.

[0094] The command to control the main battery 110 to cut off the power supply may include a command to control the main battery 110 to cut off the power supply to the heat exchange unit 322. Here, the command to control the auxiliary battery 120 to supply power to the refrigerant circulation pump 323 may include a command to operate the refrigerant circulation pump 323 using the power supplied by the auxiliary battery 120 so that the refrigerant circulates in the refrigerant circulation path 321 without being cooled by the heat exchange unit 322.

[0095] The command to control the main battery 110 to cut off power supply may include a command to switch a main relay 410 disposed on an output power supply path of the main battery 110 from a closed state to an open state. Here, the command to control the supply of power to one or more components of the cooling system 320 may include a command to control the one or more components to operate using power supplied by the auxiliary battery 120.

[0096] The command to diagnose whether an abnormality has occurred in the battery system may include a command to diagnose whether an abnormality has occurred in the battery system in a driving mode of the electric vehicle or a charging mode of the main battery 110.

[0097] The command to diagnose whether an abnormality has occurred in the battery system may include a command that is activated at predetermined time intervals in a parking mode of the electric vehicle or a sleep mode of the battery system to diagnose whether an abnormality has occurred in the battery system.

[0098] The battery management device 200 may further include an input interface device 240, an output interface device 250, a storage device 260, etc. The components included in the battery management device 200 are connected to each other by a bus 270 to communicate with each other.

[0099] Here, the processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to the embodiment of the present invention is performed. The memory (or storage device) may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory may be composed of at least one of a read-only memory (ROM) and a random access memory (RAM).

[0100] The operations of the methods according to the embodiments of the present invention can be embodied as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of storage devices in which data that can be read by a computer system is stored. In addition, the computer-readable recording medium can be distributed among computer systems connected via a network, so that the computer-readable program or code can be stored and executed in a distributed manner.

[0101] Some aspects of the invention have been described in the context of an apparatus, but they may also be described in terms of a corresponding method, where a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may be described in terms of a corresponding block or item or feature of a corresponding apparatus. Some or all of the method steps may be performed by (or using) a hardware apparatus, such as a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

[0102] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims. [Explanation of symbols]

[0103] 110: Main battery 120: Auxiliary battery 200:Battery management device 300: Power request device 310: Drive unit 320: Cooling system 321: Refrigerant circulation channel 322: Heat exchange unit 323: Refrigerant circulation pump

Claims

1. 1. A battery system located within an electric vehicle, comprising: Main battery; a battery management device that controls the main battery to cut off power supply when an abnormality occurs in one or more components included in the electric vehicle; and A battery system including an auxiliary battery that is provided separately from the main battery and that supplies power to one or more components that are configured in a cooling system for cooling the main battery when power supply from the main battery is cut off.

2. The auxiliary battery is The battery system according to claim 1 , configured to supply power to a coolant circulation pump that circulates the coolant in the coolant circulation channel.

3. The main battery is configured to provide power to the cooling system; The auxiliary battery is The battery system according to claim 2 , configured to supply power only to a refrigerant circulation pump configured in the cooling system when power supply from the main battery is cut off.

4. The cooling system comprises: a refrigerant circulation flow path through which a refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation flow path, The auxiliary battery is The battery system according to claim 1 , configured to supply power to the coolant circulation pump when power supply from the main battery is interrupted.

5. When an abnormality occurs in one or more parts, The chiller is The power supply from the main battery is cut off, The refrigerant circulation pump is The battery system according to claim 4 , wherein the battery system operates through power supplied by the auxiliary battery, and the refrigerant is circulated within the refrigerant circulation channel without being cooled by the chiller.

6. The auxiliary battery is The battery system according to claim 1 , wherein the battery exhibits an output voltage lower than an output voltage of the main battery.

7. When an abnormality occurs in one or more parts, The battery management device switching a main relay disposed on an output side power supply path of the main battery from a closed state to an open state; The battery system according to claim 1 , wherein one or more components configured in the cooling system are controlled to operate through power supplied by the auxiliary battery.

8. The battery management device 6. The battery system according to claim 1, wherein the battery system is diagnosed for abnormalities in the electric vehicle operation mode or the main battery charging mode, and if an abnormality is detected, the battery system is controlled to cut off power supply from the main battery and to allow power supply from the auxiliary battery.

9. The battery management device 6. The battery system of claim 1, wherein the battery system is activated at predetermined intervals in a parking mode of the electric vehicle or a sleep mode of the battery system to diagnose whether an abnormality has occurred in the battery system, and if an abnormality is detected, the battery system is controlled to maintain a power supply cut-off state of the main battery and to allow power supply from the auxiliary battery.

10. A method for operating a battery system by a battery management device located in an electric vehicle, comprising: diagnosing whether an abnormality has occurred in the battery system; If an abnormality is detected, controlling the main battery to cut off power supply; and A method for operating a battery system, comprising the step of controlling an auxiliary battery provided separately from the main battery to supply power to one or more components configured in a cooling system for cooling the main battery when power supply from the main battery is cut off.

11. The step of controlling the supply of power to one or more components configured in the cooling system includes: The method for operating a battery system according to claim 10 , further comprising the step of controlling the auxiliary battery to supply power to a refrigerant circulation pump that circulates the refrigerant in a refrigerant circulation channel.

12. The main battery is configured to provide power to the cooling system; The auxiliary battery is The method of claim 11 , further comprising the step of: supplying power only to a refrigerant circulation pump in the cooling system when power supply from the main battery is cut off.

13. The cooling system comprises: a refrigerant circulation flow path through which a refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation flow path, The step of controlling the supply of power to one or more components configured in the cooling system includes: The method for operating a battery system according to claim 10 , further comprising the step of controlling the auxiliary battery to supply power to the coolant circulation pump.

14. The step of controlling to cut off the power supply from the main battery includes: a step of controlling the main battery to cut off power supply to the chiller; The step of controlling the auxiliary battery to supply power to the refrigerant circulation pump includes:

14. The method of operating a battery system according to claim 13, further comprising the step of operating the refrigerant circulation pump using power supplied by the auxiliary battery to circulate the refrigerant within the refrigerant circulation path without being cooled by the chiller.

15. The auxiliary battery is The method for operating a battery system according to claim 10 , wherein the battery exhibits an output voltage lower than an output voltage of the main battery.

16. The step of controlling to cut off the power supply from the main battery includes: a step of switching a main relay disposed on an output side power supply path of the main battery from a closed state to an open state, The step of controlling the supply of power to the one or more components includes:

15. The method of operating a battery system according to claim 10, further comprising the step of controlling the one or more components to operate through power supplied by the auxiliary battery.

17. The step of diagnosing whether an abnormality has occurred in the battery system includes: The method of operating a battery system according to claim 10 , further comprising the step of diagnosing whether an abnormality has occurred in the battery system in a driving mode of the electric vehicle or a charging mode of the main battery.

18. The step of diagnosing whether an abnormality has occurred in the battery system includes:

15. The method of claim 10, further comprising: a step of diagnosing whether an abnormality has occurred in the battery system by activating the battery system at predetermined time intervals in a parking mode of the electric vehicle or a sleep mode of the battery system.

19. 1. A battery system located within an electric vehicle, comprising: a main battery that supplies power to the electric vehicle; a battery management device that controls the main battery to cut off power supply when an abnormality occurs in one or more components included in the electric vehicle; and A battery system including an auxiliary battery that is provided separately from the main battery and is designed to directly supply power only to specific components among one or more components configured in a cooling system for cooling the main battery when power supply from the main battery is cut off, and not to supply power to the remaining components of the cooling system.

20. the cooling system includes a refrigerant circulation flow path through which a refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that circulates the refrigerant within the refrigerant circulation flow path, 20. The battery system of claim 19, wherein the auxiliary battery is configured to directly supply power only to the refrigerant circulation pump of the cooling system when power supply from the main battery is interrupted.

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