Battery system and operating method of battery system

Abstract

A battery system of the present invention is positioned in an electric vehicle and may comprise: a main battery; a battery management device for controlling that the supply of power by the main battery is blocked when an anomaly occurs in one or more components included in the electric vehicle; and an auxiliary battery which is provided separately from the main battery, and which supplies power to one or more components provided in a cooling system for cooling the main battery.

Description

Battery system and method of operating the battery system

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

[0002] The present invention relates to a battery system and a method of operating the battery system.

[0003] Secondary batteries are batteries that can be reused by charging even after discharge, and can be used as an energy source for small devices such as mobile phones, tablet PCs, and vacuum cleaners, and are also used as an energy source for medium and large devices such as automobiles and ESS (Energy Storage Systems) for smart grids.

[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 system requirements. For medium- to large-sized devices such as electric vehicles, high-capacity battery systems, in which multiple battery packs are connected in parallel, can be applied to meet the device's capacity requirements.

[0005] In electric vehicles equipped with such high-capacity battery systems, efforts are ongoing to ensure the stability of the battery system even in various abnormal situations, such as abnormally high temperatures of the battery (see Korean Patent Publication No. 2020-0006404).

[0006] The present invention provides a battery system capable of improving the temperature stability of a battery even when an abnormal condition occurs.

[0007] The present invention provides a method of operating such a battery system.

[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 power supply by the main battery to be cut off 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 by the main battery is cut off.

[0009] The auxiliary battery may be configured to supply power to a refrigerant circulation unit that circulates refrigerant within a refrigerant circulation path. Here, 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 the power supply by the main battery is cut off.

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

[0011] In the event of a malfunction in one or more components, the heat exchange unit may be cut off from the power supply by the main battery. Here, the refrigerant circulation pump may operate using power supplied by the auxiliary battery, thereby allowing the refrigerant to circulate within the refrigerant circulation path without being cooled by the heat exchange unit.

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

[0013] When a problem occurs in one or more components, the battery management device can switch a main relay disposed on the power supply path on the output side 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 through power supplied by the auxiliary battery.

[0014] The battery management device can diagnose 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, when an abnormality has been detected, control to cut off the power supply by the main battery and control to allow the power supply by the auxiliary battery.

[0015] The battery management device may be activated at predetermined 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 has been detected, control may be performed to maintain a power supply cut-off state of the main battery and to allow power supply by the auxiliary battery.

[0016] According to another embodiment of the present invention, a method for operating a battery system is provided, by a battery management device located in an electric vehicle, the method comprising: a step of diagnosing whether an abnormality has occurred in the battery system; a step of controlling power supply by a main battery to be cut off when an abnormality has been detected; and a 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 the power supply by the main battery has been cut off.

[0017] The step of controlling to supply power to one or more components configured in the above cooling system may include the step of controlling to supply power to a refrigerant circulation unit, which circulates refrigerant within a refrigerant circulation 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 the refrigerant circulation unit configured in the cooling system when the power supply by the main battery is cut off.

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

[0020] The step of controlling so that the power supply by the main battery is cut off may include a step of controlling so that the power supply of the main battery to the heat exchange unit is cut off. Here, the step of controlling so that the auxiliary battery supplies power to the refrigerant circulation pump may include a step of causing the refrigerant circulation pump to operate through the power supplied by the auxiliary battery, so that the refrigerant is circulated within the refrigerant circulation path without being cooled by the heat exchange unit.

[0021] The above 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 power supply by the main battery to be cut off may include the step of switching a main relay arranged on the power supply path on the output side of the main battery from a closed state to an open state. Here, the step of controlling the power supply to the one or more components may include the step of controlling the one or more components to operate through the power supplied by the auxiliary battery.

[0023] The step of diagnosing whether an abnormality has occurred in the above battery system may include a step of diagnosing 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.

[0024] The step of diagnosing whether an abnormality has occurred in the above battery system may include a step of diagnosing whether an abnormality has occurred in the battery system by activating at predetermined intervals in the parking mode of the electric vehicle or the sleep mode of the battery system.

[0025]

[0026] According to another embodiment of the present invention, a battery system is located in an electric vehicle, and may include: a main battery for supplying power to the electric vehicle; a battery management device for controlling power supply by the main battery to be cut off when an abnormality occurs in one or more components included in the electric vehicle; and an auxiliary battery provided separately from the main battery, and designed to directly supply power only to a specific component among one or more components configured in a cooling system for cooling the main battery and not to supply power to the remaining components of the cooling system when the power supply by the main battery is cut off.

[0027] The cooling system includes a refrigerant circulation path through which refrigerant flows; a heat exchange unit that cools the refrigerant; and a refrigerant circulation pump that allows the refrigerant to circulate within the refrigerant circulation path, and the auxiliary battery may be configured to directly supply power only to the refrigerant circulation pump of the cooling system when the power supply by the main battery is cut off.

[0028] According to the above-described embodiment of the present invention, even when the output of the main battery is cut off due to an abnormal state of the battery system, at least a part of the function of the cooling system is activated by the auxiliary battery, thereby improving the temperature stability of the battery.

[0029] Figure 1 is a block diagram of a battery system according to an embodiment of the present invention.

[0030] Figure 2 is a block diagram of a battery system according to another embodiment of the present invention.

[0031] Figure 3 is a reference diagram for explaining a cooling system according to an embodiment of the present invention.

[0032] Figure 4 is an operational flowchart of a method for operating a battery system according to an embodiment of the present invention.

[0033] Figure 5 is an operational flowchart of a method for operating a battery system according to another embodiment of the present invention.

[0034] Figure 6 is an operational flowchart of a method for operating a battery system according to another embodiment of the present invention.

[0035] Figure 7 is a block diagram of a battery management device according to an embodiment of the present invention.

[0036] 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 various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated relative to other elements. Furthermore, elements of known technology that are useful or essential in commercially feasible embodiments may often not be depicted so as not to obscure the spirit of various embodiments of the present invention.

[0037] 110: Main battery

[0038] 120: Auxiliary battery

[0039] 200: Battery management device

[0040] 300: Power Requirement Device

[0041] 310; Drive Unit

[0042] 320: Cooling system

[0043] 321: Refrigerant circulation path

[0044] 322: Heat exchange unit

[0045] 323: Refrigerant circulation pump

[0046] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0047] Terms such as "first," "second," "A," and "B" may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, the first component could be referred to as the "second component," and similarly, the second component could also be referred to as the "first component." The term "and / or" includes any combination of multiple related items listed or any one of multiple related items listed.

[0048] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0049] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0050] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0051] During operation of an electric vehicle or battery charging, if a predefined abnormal condition is detected in the battery system, a relay located on the battery output side may open, thereby blocking the battery's charging and discharging power. Typically, a battery cooling system, designed to maintain battery temperature stability, operates by drawing power from the battery. However, if the relay opens and the battery power supply is interrupted, the battery's cooling function also ceases.

[0052] The present invention proposes an appropriate battery protection technology that can improve the temperature stability of a battery even when a relay placed on the output side of a battery is switched to an open state due to an abnormal condition occurring in the battery system, thereby blocking the charging and discharging path.

[0053] Some terms used in this specification are defined as follows:

[0054] A battery cell is the smallest unit that stores electricity, and a battery module is a collection of multiple battery cells that are electrically connected.

[0055] A battery pack or battery rack refers to a system with a minimum single structure that can be monitored and controlled through a BMS (Battery Management System) by electrically connecting module units set by a battery manufacturer, and can be configured to include multiple battery modules and one BPU (Battery Protection Unit) or protection device.

[0056] A battery bank can refer to a large-scale battery rack system comprised of multiple battery racks connected in parallel. A battery bank-level BMS can monitor and control the rack BMS (RBMS) at the battery rack level.

[0057] A battery assembly is a collection of multiple electrically connected battery cells that function as a power source when applied to a specific system or device. Here, the battery assembly may refer to a battery module, battery pack, battery rack, or battery bank, but the scope of the present invention is not limited to these entities.

[0058] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0059] Figures 1 and 2 are block diagrams of a battery system according to an embodiment of the present invention.

[0060] Referring to FIG. 1, the battery system may be configured to include a main battery (110), an auxiliary battery (120), and a battery management device (200).

[0061] The main battery (110) may be configured to supply power to a power request device (300) located within an electric vehicle. Here, the power request device (300) may include a driving device (310) and a cooling system (320) of the electric vehicle. In addition, the power request device (300) may include various components for the operation of the electric vehicle in addition to the driving device (310) and the cooling system (320). The cooling system (320) according to an embodiment of the present invention may be configured to include a refrigerant circulation path (321) through which refrigerant flows, a heat exchange unit (322) for cooling the refrigerant, and a refrigerant circulation pump (323) for circulating the refrigerant within the refrigerant circulation path (321).

[0062] 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 refrigerant within the refrigerant circulation path (321).

[0063] The main relay (410) is placed on the power supply path on the output side of the main battery (110) and is configured to electrically connect or disconnect the main battery (110) and the power request device (300). Here, the main relay (410) can be turned on and off by the battery management device (200).

[0064] The auxiliary relay (420) is placed on the power supply path on the output side of the auxiliary battery (120) and can be configured to electrically connect or disconnect specific components of the auxiliary battery (120) and the cooling system (320). Here, the auxiliary relay (420) can be turned on and off by the battery management device (200).

[0065] Meanwhile, as illustrated in FIG. 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 the component connected to the auxiliary battery (120), may be turned on and off by the battery management device (200).

[0066] In the present invention, the main battery (110) and the auxiliary battery (120) may mean a battery cell or a battery assembly.

[0067] According to one embodiment, the auxiliary battery (120) may be a battery that exhibits an output voltage lower than the output voltage of the main battery (110).

[0068] The battery management device (200) may correspond to a battery management system (BMS) located within a battery system, or may be configured to be included in the BMS.

[0069] The battery management device (200) can control whether power is supplied to the main battery (110) by controlling the on / off operation of the main relay (410). For example, the battery management device (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 request device (300), and can control the main relay (410) to an open state so that the power supply by the main battery (110) is cut off.

[0070] The battery management device (200) can control whether to supply power to the auxiliary battery (120) by controlling the on / off operation of the auxiliary relay (420). For example, the battery management device (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), for example, the refrigerant circulation pump (323), and can control the auxiliary relay (420) to an open state so that the power supply by the auxiliary battery (120) to the cooling system (320) or a specific component of the cooling system (320), for example, the refrigerant circulation pump (323) is cut off.

[0071] According to one 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, based on the collected status information, determine whether a predefined abnormal condition has occurred in the battery system. For example, the battery management device (200) can determine whether an abnormal condition such as overheating, high voltage, high current, short circuit, arc, or venting has occurred in the battery system.

[0072] In one embodiment, the battery management device (200) may, in conjunction with a diagnostic unit of the electric vehicle, check for abnormalities in one or more components included in the electric vehicle. For example, the battery management device (200) may be configured to receive information regarding abnormal conditions in the external components of the battery system from the diagnostic unit of the electric vehicle.

[0073] The battery management device (200) can control the power supply by the main battery (110) to be cut off when an abnormality occurs in the battery system or the electric vehicle, and can control one or more components configured in the cooling system (320) to operate through power supplied by the auxiliary battery (120).

[0074] 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 switch the auxiliary relay (420) from an open state to a closed state. Accordingly, the power supply of the main battery (110) to the power request device (300) is cut off, and only at least some functions of the cooling system (320), for example, 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 be circulated in the refrigerant circulation path (321) without being cooled by the heat exchange unit (322).

[0075] Meanwhile, when the auxiliary battery (120) is configured to be directly connected to a specific component of the cooling system (320), for example, a 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 component so that the component operates through power supplied by the auxiliary battery (120) rather than the main battery (110).

[0076] Figure 3 is a reference diagram for explaining a cooling system (320) according to an embodiment of the present invention.

[0077] Referring to FIG. 3, the cooling system (320) may be configured to include a refrigerant circulation path (321) through which refrigerant (C) circulates. According to one embodiment, the refrigerant (C) may be cooling water.

[0078] 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 coolant circulation path (321) can be accommodated inside the cooling plate (P). Here, the coolant (C) flows inside the cooling plate (P) and can absorb heat generated from the main battery (110). According to one embodiment, the cooling plate (P) can be a heat exchange unit (322).

[0079] The cooling system (320) can reduce the temperature of the coolant (C) through the heat exchange unit (322). Here, the heat exchange unit (322) can reduce the temperature of the first coolant (C) by allowing the first coolant (C) for cooling the main battery (110) to exchange heat with a second coolant having a lower temperature than the first coolant (C).

[0080] The refrigerant circulation pump (323) is arranged on the flow path of the refrigerant (C) and can apply a certain pressure to the refrigerant (C) so that the refrigerant (C) is circulated in a specific direction within the refrigerant circulation path (321).

[0081] Referring again to FIG. 2, the auxiliary battery (120) may be configured to supply power to the 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).

[0082] 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 configured as a 12 V lead-acid battery or a 48 V low-voltage battery for activating only the refrigerant circulation function of the cooling system (320).

[0083] According to an embodiment of the present invention, when the output of the main battery (110) is blocked due to an abnormal condition, the battery cooling function is deactivated, but the coolant circulation function can be activated by the auxiliary battery (120), which is a low-voltage battery. Accordingly, the temperature of the main battery (110) is stabilized for a certain period of time, and the occurrence of additional abnormal conditions can be prevented or delayed.

[0084] Figure 4 is an operational flowchart of a method for operating a battery system according to an embodiment of the present invention.

[0085] The operating method of 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.

[0086] In addition, the operating method of the battery system according to the embodiment of the present invention can be performed in the driving mode of the electric vehicle or the charging mode of the main battery.

[0087] The battery management device (200) can diagnose whether an abnormality has occurred in the battery system (S410). Here, the battery management device (200) can collect status information of the battery system through one or more sensors and determine whether a predefined abnormal condition has occurred based on the collected status information. In addition, the battery management device (200) can receive abnormal condition information regarding the external configuration of the battery system from the diagnostic unit of the electric vehicle.

[0088] The battery management device (200) can check whether a predefined abnormal state has occurred (S420), and if the abnormal state has occurred, control the power supply by the main battery (110) to be cut off (S430). Here, the battery management device (200) can cut off the output of the main battery (110) by switching the main relay (410) located on the power supply path on the output side of the main battery (110) from a closed state to an open state.

[0089] The battery management device (200) can control some functions of the cooling system (320) to be activated through power from the auxiliary battery (120) (S440).

[0090] For example, the battery management device (200) can activate at least some functions of the cooling system (320) by controlling one or more components configured in the cooling system (320) to operate through power supplied by the auxiliary battery (120).

[0091] Figure 5 is an operational flowchart of a method for operating a battery system according to another embodiment of the present invention.

[0092] The battery management device (200) can diagnose whether an abnormality has occurred in the battery system (S510). Here, the battery management device (200) can collect status information of the battery system through one or more sensors and determine whether a predefined abnormal condition has occurred based on the collected status information. In addition, the battery management device (200) can receive abnormal condition information regarding the external configuration of the battery system from the electric vehicle's diagnostic unit.

[0093] The battery management device (200) can check whether a predefined abnormal condition has occurred (S520), and if the abnormal condition has occurred, control the power supply by the main battery (110) to be cut off (S530). Here, since the heat exchange unit (322) of the battery cooling system (320) is configured to operate by receiving power from the main battery (110), the cooling function of the battery can be stopped.

[0094] The battery management device (200) can control the cooling system (320) to maintain only the refrigerant circulation function through the power of the auxiliary battery (120) (S540).

[0095] For example, the auxiliary battery (120) may be configured to supply power to a refrigerant circulation unit (e.g., a refrigerant circulation pump (323)) configured in the cooling system (320). Here, even when the output of the main battery (110) is cut off due to an abnormal condition occurring, the refrigerant circulation unit may be operated through the power of the auxiliary battery (120), so that the refrigerant circulation function may be maintained. At this time, since the power supply to the heat exchange unit (322) is cut off, the refrigerant may be circulated within the refrigerant circulation path (321) without being cooled by the heat exchange unit (322).

[0096] According to an embodiment of the present invention, when the output of the main battery (110) is blocked due to an abnormal condition, the battery cooling function is deactivated, but the coolant circulation function can be activated by the auxiliary battery (120), which is a low-voltage battery. Accordingly, the temperature of the main battery (110) is stabilized for a certain period of time, and the occurrence of additional abnormal conditions can be prevented or delayed.

[0097] Figure 6 is an operational flowchart of a method for operating a battery system according to another embodiment of the present invention.

[0098] A method for operating a battery system according to another embodiment of the present invention can be performed in a parking mode of an electric vehicle or a sleep mode of a battery system.

[0099] When the electric vehicle switches to parking mode or the battery system switches to sleep mode (S610), the battery management device (200) can switch the main relay (410) from a closed state to an open state (S620). Accordingly, the output of the main battery (110) can be cut off.

[0100] Afterwards, the battery management device (200) is activated at predetermined intervals to check for any abnormalities in the battery system and electric vehicle (S630).

[0101] When a predefined abnormal condition occurs, the battery management device can maintain the power supply cut-off state of the main battery (110) (S640). For example, even when the electric vehicle switches from parking mode to driving mode or the battery system is released from sleep mode, the battery management device (200) can prevent the main relay (410) from switching to a closed state and maintain the main relay (410) in an open state.

[0102] 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., refrigerant circulation pump (323)) to operate using power from the auxiliary battery (120). (S650) Accordingly, even when an abnormal condition occurs, the refrigerant circulation function is activated by the auxiliary battery (120), so that the temperature of the main battery (110) can be stabilized for a certain period of time.

[0103] Figure 7 is a block diagram of a battery management device (200) according to an embodiment of the present invention.

[0104] The battery management device (200) according to an embodiment of the present invention may correspond to a battery management system (BMS) located within a battery system, or may be configured to be included in the BMS.

[0105] A battery management device (200) may include at least one processor (210), a memory (220) that stores at least one command executed through the processor, and a transmission / reception device (230) that is connected to a network and performs communication.

[0106] The at least one command may include a command for diagnosing whether an abnormality has occurred in the battery system; a command for controlling power supply by the main battery (110) to be cut off when an abnormality has been detected; and a command for controlling an auxiliary battery (120) 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).

[0107] A command for controlling power supply to one or more components configured in the cooling system (320) may include a command for controlling the auxiliary battery (120) to supply power to a refrigerant circulation unit, for example, a refrigerant circulation pump (323), which circulates refrigerant within a refrigerant circulation path (321).

[0108] The main battery (110) is configured to supply power to the cooling system (320), and the auxiliary battery (120) may be configured to supply power only to a refrigerant circulation unit configured in the cooling system (320), for example, a refrigerant circulation pump (323), when the power supply by the main battery (110) is cut off.

[0109] The cooling system (320) may include a refrigerant circulation path (321) through which refrigerant flows; a heat exchange unit (322) that cools the refrigerant; and a refrigerant circulation pump (323) that allows the refrigerant to circulate within the refrigerant circulation path. Here, a command for controlling power supply to one or more components configured in the cooling system (320) may include a command for controlling the auxiliary battery (120) to supply power to the refrigerant circulation pump (323).

[0110] The command for controlling the power supply by the main battery (110) to be cut off may include a command for controlling the power supply of the main battery (110) to the heat exchange unit (322) to be cut off. Here, the command for controlling the auxiliary battery (120) to supply power to the refrigerant circulation pump (323) may include a command for causing the refrigerant circulation pump (323) to operate through the power supplied by the auxiliary battery (120) so that the refrigerant is circulated within the refrigerant circulation path (321) without being cooled by the heat exchange unit (322).

[0111] The command for controlling the power supply by the main battery (110) to be cut off may include a command for switching the main relay (410) arranged on the power supply path on the output side of the main battery (110) from a closed state to an open state. Here, the command for controlling the power supply to one or more components of the cooling system (320) may include a command for controlling the one or more components to operate through the power supplied by the auxiliary battery (120).

[0112] The command for diagnosing whether an abnormality has occurred in the above battery system may include a command for diagnosing 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 (110).

[0113] The command for diagnosing whether an abnormality has occurred in the above battery system may include a command that is activated at a predetermined time interval 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.

[0114] The battery management device (200) may also include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the battery management device (200) may be connected by a bus (270) and communicate with each other.

[0115] Here, the processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. The memory (or storage device) may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory may be comprised of at least one of a read-only memory (ROM) and a random access memory (RAM).

[0116] The operations of the method according to an embodiment 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 any type of recording device that stores data readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0117] While some aspects of the present invention have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most significant method steps may be performed by such a device.

[0118] Although the present invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

Claims

1. A battery system located within an electric vehicle, Main battery; A battery management device that controls power supply by the main battery to be cut off when an abnormality occurs in one or more components included in the electric vehicle; and A battery system comprising an auxiliary battery, which 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 by the main battery is cut off.

2. In claim 1, The above auxiliary battery is, A battery system configured to supply power to a refrigerant circulation pump that circulates refrigerant within a refrigerant circulation path.

3. In claim 2, The above main battery is, configured to supply power to the above cooling system, The above auxiliary battery is, A battery system configured to supply power only to a refrigerant circulation pump configured in the cooling system when the power supply by the main battery is cut off.

4. In claim 1, The above cooling system, It comprises a refrigerant circulation path through which refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that allows the refrigerant to circulate within the refrigerant circulation path. The above auxiliary battery is, A battery system configured to supply power to the refrigerant circulation pump when the power supply by the main battery is cut off.

5. In claim 4, If one or more parts fail, The above chiller, The power supply from the above main battery is cut off, The above refrigerant circulation pump, A battery system that operates by power supplied by the auxiliary battery, thereby allowing the refrigerant to circulate within the refrigerant circulation path without being cooled by the chiller.

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

7. In claim 1, If one or more parts fail, The above battery management device, The main relay located on the power supply path on the output side of the above main battery is switched from a closed state to an open state, A battery system that controls one or more components configured in the above cooling system to operate through power supplied by the above auxiliary battery.

8. In claim 1, The above battery management device, A battery system that 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, when an abnormality is detected, controls to cut off the power supply by the main battery and allows the power supply by the auxiliary battery.

9. In claim 1, The above battery management device, A battery system that is activated at predetermined 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 when an abnormality has been detected, to maintain the power supply cut-off state of the main battery and to control power supply by the auxiliary battery to be allowed.

10. A method for operating a battery system by a battery management device located in an electric vehicle, A step of diagnosing whether an abnormality has occurred in the above battery system; When an abnormality is detected, a step for controlling the power supply by the main battery to be cut off; and A method for operating a battery system, comprising a 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 the power supply by the main battery is cut off.

11. In claim 10, A step of controlling power supply to one or more components configured in the above cooling system, A method of operating a battery system, comprising a step of controlling the auxiliary battery to supply power to a refrigerant circulation pump that circulates refrigerant within a refrigerant circulation path.

12. In claim 11, The above main battery is, configured to supply power to the above cooling system, The above auxiliary battery is, An operating method of a battery system, wherein power is supplied only to a refrigerant circulation pump configured in the cooling system when the power supply by the main battery is cut off.

13. In claim 10, The above cooling system, It comprises a refrigerant circulation path through which refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that allows the refrigerant to circulate within the refrigerant circulation path. A step of controlling power supply to one or more components configured in the above cooling system, A method of operating a battery system, comprising a step of controlling the auxiliary battery to supply power to the refrigerant circulation pump.

14. In claim 13, The step of controlling the power supply by the above main battery to be cut off is: Including a step of controlling the power supply of the main battery to the chiller to be cut off, The step of controlling the auxiliary battery to supply power to the refrigerant circulation pump is: A method of operating a battery system, comprising the step of causing the refrigerant circulation pump to operate through power supplied by the auxiliary battery, thereby allowing the refrigerant to circulate within the refrigerant circulation path without being cooled by the chiller.

15. In claim 10, The above auxiliary battery is, A method of operating a battery system, wherein the battery exhibits an output voltage lower than the output voltage of the main battery.

16. In claim 10, The step of controlling the power supply by the above main battery to be cut off is: A step of switching a main relay placed on the power supply path on the output side of the main battery from a closed state to an open state is included. The step of controlling power supply to one or more of the components above is: A method of operating a battery system, comprising the step of controlling one or more of the components to operate through power supplied by the auxiliary battery.

17. In claim 10, The step of diagnosing whether an abnormality has occurred in the above battery system is as follows: A method for operating a battery system, comprising a step of diagnosing 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.

18. In claim 10, The step of diagnosing whether an abnormality has occurred in the above battery system is as follows: A method for operating a battery system, comprising a step of diagnosing whether an abnormality has occurred in the battery system by activating the battery system at predetermined intervals in the parking mode of the electric vehicle or the sleep mode of the battery system.

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

20. In claim 19, The cooling system includes a refrigerant circulation path through which refrigerant flows; a chiller that cools the refrigerant; and a refrigerant circulation pump that allows the refrigerant to circulate within the refrigerant circulation path. A battery system, wherein the auxiliary battery is configured to directly supply power only to the refrigerant circulation pump of the cooling system when the power supply by the main battery is cut off.

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