System and method for managing a battery

Abstract

A system and method for managing batteries can proactively notify vehicle users of dangerous situations by detecting whether simultaneous melting of the positive and negative relays has occurred when communication with the battery is interrupted.

Description

Technical Field

[0001] This disclosure relates to a system and method for managing batteries. Background Technology

[0002] Currently, commercially available rechargeable batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium-ion batteries. Among them, lithium-ion batteries, which have almost no memory effect compared to nickel-based batteries, have become the mainstream due to their advantages such as free charging and discharging, extremely low self-discharge rate, and high energy density.

[0003] Recently, secondary batteries (batteries) have been widely used for power and energy storage in vehicles (such as electric two-wheelers and electric vehicles) and medium and large-sized equipment (such as energy storage systems (ESS)). This has led to increased interest in batteries and more active research and development in battery-related fields. Furthermore, for vehicle batteries, the commercialization and research of interchangeable battery packs are already underway.

[0004] Lithium-ion secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Furthermore, a lithium-ion secondary battery includes an electrode assembly and a casing (i.e., the battery housing). The electrode assembly contains positive and negative electrode plates, each coated with a positive and negative electrode active material, respectively, with a separator located between the positive and negative electrode plates. The casing seals and encapsulates the electrode assembly along with the electrolyte. Based on the shape of the casing, lithium-ion secondary batteries can be classified into can-type secondary batteries (where the electrode assembly is housed in a metal can) and pouch-type secondary batteries (where the electrode assembly is housed in a pouch formed of aluminum laminates). Can-type secondary batteries can be further classified according to their shape into prismatic secondary batteries and cylindrical secondary batteries.

[0005] Multiple secondary batteries can be electrically connected and housed together within a module housing (module casing) or a battery pack housing (battery pack casing) to form a battery module or battery pack. Here, each secondary battery included in a battery module or battery pack can be referred to as a battery cell.

[0006] In a battery system comprising multiple batteries connected in parallel (e.g., battery cells, battery modules, or battery packs), the battery management system (BMS) located within the battery detects battery faults and operates and manages the battery system. In a parallel battery pack system, if a specific battery pack experiences a communication failure and both the positive and negative relays blow simultaneously, the higher-level controller and the battery management system cannot receive relay fault information via Controller Area Network (CAN) communication, and the relays for that specific battery pack are physically blown. In the prior art, in the event of a CAN communication failure, an alarm is issued to stop the vehicle's operation and prompt a repair shop to inspect it. However, even a simple communication failure in a single battery pack can ultimately cause the entire vehicle system to fail, leading to user inconvenience and over-diagnosis. Summary of the Invention

[0007] Technical issues

[0008] According to embodiments of this disclosure, a system and method for managing a battery are provided, the system and method detecting whether a positive relay and a negative relay simultaneously blow when communication with the battery is interrupted.

[0009] The problems to be solved by this disclosure are not limited to those described above, and can be extended in various ways without departing from the spirit and scope of this disclosure.

[0010] Technical solution

[0011] According to an embodiment of this disclosure, a system for managing batteries installed in a vehicle is provided. The system includes: a plurality of slave battery management devices, each corresponding to a plurality of batteries; and a master battery management device, which receives data from the plurality of slave battery management devices and, in the event of a communication interruption with one or more of the plurality of batteries, acquires the relay status of the one or more batteries.

[0012] The main battery management device can obtain the relay status of the battery by using the current flowing through each of the plurality of batteries and the current flowing through the junction box on which the main battery management device is installed.

[0013] When the current flowing through the junction box is greater than the sum of the currents flowing through each of the plurality of batteries, the main battery management device can determine that there is a battery in which both the positive and negative relays have blown simultaneously.

[0014] When the current flowing through the junction box is greater than the value obtained by adding a preset margin to the sum of the currents flowing through each of the plurality of batteries, the main battery management device can determine that there is a battery in which both the positive and negative relays have blown simultaneously.

[0015] When it is determined that both the positive and negative relays of a battery have blown simultaneously, the main battery management device can provide a fault alarm message to the vehicle.

[0016] When the vehicle is in wake-up mode, communication with one or more of the batteries is interrupted, and the voltage of the junction box is greater than or equal to a preset reference value, the main battery management device obtains the relay status of the battery.

[0017] When the vehicle is in driving mode or charging mode, the main battery management device can obtain the relay status of the battery.

[0018] The main battery management device receives data from the slave battery management device via Controller Area Network (CAN) communication.

[0019] The battery can refer to one of the following: battery cell, battery cell pack, battery module, battery pack, and battery rack.

[0020] According to an embodiment of the present disclosure, a method for managing a battery is provided, the method being performed by a system for managing batteries installed in a vehicle, the system including a plurality of slave battery management devices corresponding to a plurality of batteries and a master battery management device receiving data from the plurality of slave battery management devices, the method including: in a state of communication interruption with one or more of the plurality of batteries, the master battery management device acquiring a relay state of the one or more batteries.

[0021] In the relay status acquisition operation, the relay status of the battery is acquired by using the current flowing through each of the plurality of batteries and the current flowing through the junction box on which the main battery management device is installed.

[0022] In the relay status acquisition operation, when the current flowing through the junction box is greater than the sum of the currents flowing through each of the plurality of batteries, it can be determined that there is a battery in which both the positive and negative relays have blown simultaneously.

[0023] The method for managing the battery may further include providing a fault alarm message to the vehicle when it is determined that there is a battery in which both the positive and negative relays have blown simultaneously.

[0024] In the relay status acquisition operation, when the vehicle is in wake-up mode, communication with one or more of the batteries is interrupted, and the voltage of the junction box is greater than or equal to a preset reference value, the relay status of the battery can be acquired.

[0025] According to embodiments of the present disclosure, a computer-readable storage medium records a program for performing the above-described method for managing a battery on a computer.

[0026] Beneficial effects

[0027] According to embodiments of this disclosure, by detecting whether the simultaneous melting of the positive and negative relays has occurred when communication with the battery is interrupted, a dangerous situation can be notified to the vehicle user in advance.

[0028] The effects of the various embodiments of this disclosure are not limited to those described above, and it will be apparent to those skilled in the art that various effects are inherent in this disclosure. Attached Figure Description

[0029] Figure 1 This is a block diagram illustrating a battery management device according to an embodiment of the present disclosure.

[0030] Figure 2 This is a block diagram illustrating a system for managing batteries according to an embodiment of the present disclosure.

[0031] Figure 3 This is a flowchart illustrating a method for managing a battery according to an embodiment of the present disclosure.

[0032] Figure 4 It is shown Figure 3 The flowchart shown illustrates the steps for obtaining the battery relay status.

[0033] Figure 5 This is a diagram illustrating an example of a battery relay status acquisition operation according to an embodiment of the present disclosure. Detailed Implementation

[0034] In the following, embodiments will be described in detail with reference to the accompanying drawings. The advantages and features of this disclosure, as well as the methods for implementing this disclosure, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed below, and can be implemented in various different forms, and the embodiments are defined only by the scope of the claims.

[0035] Throughout this specification, the same reference numerals denote the same elements. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, unless expressly defined herein, terms such as those defined in common dictionaries are not to be interpreted in an idealized or overly formal sense.

[0036] In this specification, terms such as "first" and "second" are used to distinguish one component from another, and the scope of the invention is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0037] In this specification, the identifiers used for each step (e.g., a, b, c, etc.) are for ease of description and do not describe the order of each step. Furthermore, the steps described herein may be performed in an order different from the explicitly described order. In other words, the steps may be performed in the same order as described, simultaneously, or in the reverse order.

[0038] In this specification, expressions such as “have,” “may have,” “include,” or “may include” indicate the presence of a corresponding feature (e.g., a component such as a number, function, operation, or part) and do not exclude the presence of additional features.

[0039] Additionally, the term "~unit" as used in this embodiment refers to a hardware element such as an FPGA or ASIC, and a "~unit" performs certain roles. However, a "~unit" is not limited to software or hardware. A "~unit" can be configured to reside in addressable storage media or to execute one or more processors. Therefore, a "~unit" can include, for example, elements such as software elements, object-oriented software elements, class elements and task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided in elements and "~units" can be combined into fewer elements and "~units" or subdivided into additional elements and "~units".

[0040] In the following, a system and method for managing batteries according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0041] First, refer to Figure 1 A battery management device according to an embodiment of the present disclosure is described.

[0042] Figure 1 This is a block diagram illustrating a battery management device according to an embodiment of the present disclosure.

[0043] refer to Figure 1 The battery management device 100 according to the embodiments of the present disclosure can perform diagnostic and / or control operations on the battery 200.

[0044] Here, battery 200 can be a concept including battery cell representing a single secondary battery, battery cell group including multiple battery cells, battery module, battery pack, battery rack, etc.

[0045] Therefore, the battery management device 100 may include a measurement unit 110, a storage unit 120, and a controller 130.

[0046] The measuring unit 110 can be configured to measure the status information of the battery 200.

[0047] Here, the state information of battery 200 can include the internal and / or external states of battery 200. For example, the measuring unit 110 can measure information such as voltage, current, temperature, state of charge (SOC), depth of discharge (DOD), internal resistance, state of health (SOH), idle state, overvoltage or overcurrent state, and equilibrium state, which are internal states of battery 200. For this purpose, the measuring unit 110 can include various sensors, such as voltage sensors or current sensors. As another example, the measuring unit 110 can measure state information of external conditions of battery 200, such as temperature, humidity, and smoke around battery 200. For this purpose, the measuring unit 110 can include sensors, such as temperature sensors, humidity sensors, and smoke sensors. In this respect, the measuring unit 110 can also be referred to as a sensor.

[0048] Here, the measurement unit 110 can measure voltage, current, temperature, etc., through sensors to measure the state information of the battery 200 in one dimension. Furthermore, the measurement unit 110 can perform two-dimensional processing on the one-dimensional information, such as calculations. For example, the measurement unit 110 can measure state information of the battery 200, such as state of charge (SOC), internal resistance, state of health (SOH), and imbalance, based on state information such as voltage, current, and temperature.

[0049] Then, the measurement unit 110 can send the measured status information of the battery 200 to the controller 130.

[0050] Storage unit 120 may be configured to store computer-executable instructions, program code, program data, and / or other suitable forms of information for each component of battery management device 100 (i.e., measurement unit 110 and / or controller 130) to perform their functions. The program stored in storage unit 120 may include a set of instructions executable by controller 130. In embodiments of this document, storage unit 120 may be a memory (e.g., volatile memory, non-volatile memory, or suitable combinations thereof), one or more disk storage devices, optical disk storage devices, flash memory storage devices, or any other form of storage medium or suitable combination thereof accessible by battery management device 100 and capable of storing required information.

[0051] Here, the storage unit 120 can be implemented as an integrated component of another component included in the battery management device 100, such as a component used as the controller 130. For example, the storage unit 120 can be implemented as an embedded memory provided in a processor used as the controller 130.

[0052] The controller 130 can receive measured status information from the measurement unit 110. In addition, the controller 130 can use the status information received from the measurement unit 110 to perform diagnostic and / or control operations on the battery 200.

[0053] Here, the controller 130 can transmit or store information based on diagnostic and / or control operations of the battery 200 to another component. These other components may be those included in the battery management device 100 according to embodiments of this disclosure, or they may be components included in another device located outside the battery management device 100. Specifically, when the target battery 200 is installed in a vehicle, the battery management device 100 can send information based on diagnostic and / or control operations of the battery 200 to a higher-level vehicle control system, such as a vehicle control unit (VCU), electronic control unit (ECU), etc.

[0054] Furthermore, the controller 130 can use various wired or wireless communication configurations or methods to transmit information based on the diagnostic and / or control operations of the battery 200. For example, the controller 130 can use Controller Area Network (CAN) communication to transmit information based on the diagnostic and / or control operations of the battery 200 to the vehicle control system.

[0055] Furthermore, as part of the battery 200 control operation, the controller 130 can be configured to control the charging or discharging operation of the battery 200. In this case, the controller 130 can directly perform the charging or discharging control of the battery 200. Of course, the controller 130 can also indirectly instruct or control other components located inside or outside the battery management device 100 to perform charging or discharging control.

[0056] Furthermore, the controller 130 can perform processing operations based on the state of the battery 200. Here, the controller 130 can be configured to perform different processing operations for each state. Additionally, the controller 130 can perform at least partially the same processing operations for different states. Furthermore, the processing operations performed by the controller 130 do not necessarily include only active operations, but may also include passive operations. Specifically, the processing operations performed by the controller 130 may include operations that do not involve any control or communication.

[0057] In addition, when the controller 130 directly performs the processing operation of the battery 200, the controller 130 can transmit the processing result to other components.

[0058] Furthermore, the battery management operations according to the embodiments of this document can be applied not only to a single battery cell, but also to a unit comprising multiple battery cells, such as a cell assembly, battery module, battery pack, battery rack, and energy storage system (ESS).

[0059] Furthermore, the controller 130 may optionally include, at least in part, a processor, a controller, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, registers, a communication modem, data processing devices, etc. (all of which are well known in the art) to perform related operations or functions. Moreover, these operations can be implemented in software, in which case the program can be stored in the storage unit 120. In this respect, the controller 130 can be referred to by terms such as processor, control unit, or chipset. Furthermore, these components can also be used to implement at least some of the functions of the measurement unit 110.

[0060] Furthermore, the controller 130 does not necessarily have to be physically integrated or located in the same place. For example, some functions of the controller 130 can be performed on the battery 200, while other functions of the controller 130 can be performed on the vehicle side.

[0061] More specifically, at least a portion of the controller 130 can be implemented by a battery management system (BMS), energy storage system (ESS), etc., with the BMS typically included within the battery pack. In this case, at least a portion of the controller 130 can be implemented as being included within the battery 200. Alternatively, at least a portion of the controller 130 can be located external to the battery management device 100. For example, at least a portion of the functionality of the controller 130 can be implemented by an on-board control device such as a VCU or ECU. Furthermore, the measuring unit 110 can also be implemented as an integrated or separate component or element.

[0062] Additionally, a single battery management device 100 can perform integrated diagnostic and / or control operations on each of the plurality of batteries 200. Of course, a single battery management device 100 can be provided for each battery 200. For example, if there are three batteries 200, three battery management devices 100 can be provided to perform diagnostic and / or control operations on each of the three batteries 200. In this case, one of the plurality of battery management devices 100 can operate as a master device, while the remaining battery management devices 100 can operate as slave devices. The single battery management device 100 operating as a master device can control the operation of the remaining battery management devices 100 operating as slave devices to perform integrated management of all the plurality of batteries 200. Furthermore, all the plurality of battery management devices 100 can operate as slave devices, and a single battery management device 100 can be provided to control the operation of all the plurality of battery management devices 100 operating as slave devices.

[0063] Now, refer to Figure 2 A system for managing batteries according to embodiments of the present disclosure is described.

[0064] Figure 2 This is a block diagram illustrating a system for managing batteries according to an embodiment of the present disclosure.

[0065] Reference Figure 2 The system for managing batteries includes multiple slave battery management devices 100-1 to 100-n corresponding to multiple batteries 200-1 to 200-n, and a main battery management device 100-0 connected to the multiple slave battery management devices 100-1 to 100-n. The main battery management device 100-0 can be installed in a vehicle.

[0066] Here, each of the plurality of batteries 200-1 to 200-n can represent one of the following: battery cell, battery cell pack, battery module, battery pack, or battery rack.

[0067] The main battery management device 100-0 can receive data from multiple slave battery management devices 100-1 to 100-n, and can obtain the relay status of one or more batteries 200 when communication with one or more batteries 200 of the multiple batteries 200-1 to 200-n is interrupted.

[0068] In addition, the main battery management device 100-0 can receive data from multiple slave battery management devices 100-1 to 100-n via CAN communication. For example, the main battery management device 100-0 can receive relay status information, current value, unique identification information of battery 200, etc. from each of the multiple slave battery management devices 100-1 to 100-n.

[0069] Therefore, the battery management system according to the embodiments of this disclosure can detect whether the simultaneous melting of the positive and negative relays occurs when communication with the battery 200 is interrupted, thereby notifying the vehicle user of the dangerous situation in advance.

[0070] Here, we will refer to Figure 3 and Figure 4 The battery relay status acquisition operation, as a method for managing a battery according to embodiments of the present disclosure, is described in more detail.

[0071] Figure 3 This is a flowchart illustrating a method for managing a battery according to an embodiment of the present disclosure, and Figure 4 It is shown Figure 3 The flowchart shown is for the steps of obtaining the battery relay status.

[0072] Reference Figure 3 The main battery management device 100-0 can obtain the relay status of one or more batteries 200 when communication with one or more of the plurality of batteries 200-1 to 200-n is interrupted (S100).

[0073] That is, the main battery management device 100-0 can obtain the relay state of battery 200 by using the current flowing through each of the plurality of batteries 200-1 to 200-n and the current flowing through the junction box on which the main battery management device 100-0 is installed. Here, the main battery management device 100-0 can receive the current value flowing through each of the plurality of batteries 200-1 to 200-n from each of the plurality of battery management devices 100-1 to 100-n.

[0074] For more details, see [link to relevant documentation]. Figure 4 When the vehicle is in wake-up mode, communication with one or more batteries 200 is interrupted, and the voltage of the junction box is greater than or equal to a preset reference value, the main battery management device 100-0 can acquire the relay status of one or more batteries 200 (S110-Y). For example, if battery 200 is "a 2.5V capacity battery cell" and there are a total of 96 batteries 200, then considering a 40V margin to avoid misdiagnosis, the reference value can be set to "200V = (96 × 2.5V) - 40V". When the vehicle wakes up, the relays of battery 200 are disconnected. That is, if the voltage of the junction box is measured to be greater than or equal to the reference value "200V", it may mean that the simultaneous melting of the positive and negative relays has occurred. In other words, before performing the battery relay status acquisition operation to determine whether the simultaneous melting of the positive and negative relays has occurred, a pre-diagnostic operation can be performed to compare the voltage of the junction box with the reference value to avoid misdiagnosis due to current deviations of the batteries 200.

[0075] Here, when the vehicle is in driving mode or charging mode, the main battery management device 100-0 can obtain the relay status of the battery 200.

[0076] That is, the main battery management device 100-0 can obtain the current flowing through each of the multiple batteries 200-1 to 200-n and the current flowing through the junction box (S120).

[0077] If the current flowing through the junction box is greater than the sum of the currents flowing through each of the multiple batteries 200-1 to 200-n (S130-Y), then the main battery management device 100-0 can determine that there is a battery 200 where both the positive and negative relays are simultaneously blown (S140).

[0078] Here, the main battery management device 100-0 can determine the presence of a battery 200 where both the positive and negative relays are blown, taking into account a margin to ensure the accuracy of relay status acquisition. In other words, if the current flowing through the junction box is greater than a value obtained by adding a preset margin to the sum of the currents flowing through each of the multiple batteries 200-1 to 200-n, then the main battery management device 100-0 can determine that a battery 200 exists where both the positive and negative relays are blown.

[0079] Subsequently, if it is determined that there is a battery 200 where both the positive and negative relays have blown simultaneously, the main battery management device 100-0 can provide a fault alarm message to the vehicle (S150).

[0080] Now, refer to Figure 5 An example of battery relay status acquisition operation according to an embodiment of this disclosure is described.

[0081] Figure 5 This is a diagram illustrating an example of a battery relay status acquisition operation according to an embodiment of the present disclosure.

[0082] A system for managing batteries, which describes an example of battery relay status acquisition operation according to an embodiment of the present disclosure, may include three slave battery management devices 100-1 to 100-3 corresponding to three batteries 200-1 to 200-3 respectively, and a master battery management device 100-0 connected to the three slave battery management devices 100-1 to 100-3.

[0083] If only the positive relay blows or another fault in battery 200 (in the case where driving is permitted without the battery in question, such as a sensor failure or a defective battery cell) is diagnosed, the relay of the corresponding battery 200 can be disconnected, and driving can be performed using another battery 200.

[0084] However, if both the positive and negative relays blow simultaneously, even if the battery management device 100 controls the relays to disconnect, the battery management device 100 cannot disconnect the relays, resulting in a dangerous situation where the voltage of the battery 200 remains on the inverter side. Here, charging and discharging can also be performed on the vehicle side by blowing the relays.

[0085] Due to a CAN communication failure with battery 200, the main battery management unit 100-0, acting as the upper-level controller, can detect that the vehicle is operating using batteries 200 other than battery 200 (whose own control relay is disconnected). However, because the battery's relay is simultaneously blown, charging and discharging current continues to flow, and the main battery management unit 100-0 is unaware of this. The main battery management unit 100-0 uses batteries 200 other than battery 200 (due to the communication interruption with battery 200) to operate the vehicle. (The corresponding battery itself performs relay disconnection control, but actual disconnection is impossible.) Furthermore, regardless of the vehicle mode (e.g., ignition off mode), high voltage is continuously applied to the inverter, creating a dangerous situation.

[0086] To address this issue, the battery management system according to the embodiments of this document can diagnose whether the positive and negative relays have blown simultaneously, even in the event of a communication interruption, and provide a vehicle operation stop alarm message based on the diagnostic results.

[0087] Reference Figure 5 The main battery management device 100-0 first determines whether communication with one or more batteries 200 is interrupted, and whether the voltage of the junction box on which the main battery management device 100-0 is installed is greater than or equal to a reference value.

[0088] If communication with one or more batteries 200 is interrupted and the voltage of the junction box is greater than or equal to the reference value, the main battery management device 100-0 can acquire the current value flowing from the first slave battery management device 100-1 to the first battery 200-1, acquire the current value flowing from the second slave battery management device 100-2 to the second battery 200-2, and acquire the current value flowing from the third slave battery management device 100-3 to the third battery 200-3.

[0089] Subsequently, the main battery management device 100-0 can determine whether the current flowing through the junction box is greater than the sum of the currents flowing through each of the three batteries 200-1 to 200-3. If the current flowing through the junction box is greater than the sum of the currents flowing through each of the three batteries 200-1 to 200-3, then the main battery management device 100-0 can determine that there is a battery 200 among the three batteries 200-1 to 200-3 where both the positive and negative relays have blown simultaneously. Here, the main battery management device 100-0 can determine whether there is a battery 200 where both the positive and negative relays have blown simultaneously by considering a preset margin value. In other words, if the current flowing through the junction box is greater than the value obtained by adding the margin value to the sum of the current values ​​flowing through each of the three batteries 200-1 to 200-3, then the main battery management device 100-0 can determine that there is a battery 200 among the three batteries 200-1 to 200-3 where both the positive and negative relays have blown.

[0090] When it is determined that there is a battery 200 where both the positive and negative relays have blown simultaneously, the main battery management device 100-0 can provide a fault alarm message to the vehicle.

[0091] The operations of the embodiments described above in this document can be implemented in the form of program instructions, which can be executed by various computer devices and recorded on a computer-readable storage medium. A computer-readable storage medium refers to any medium that participates in providing instructions to a processor for execution. A computer-readable storage medium may include program instructions, data files, data structures, or combinations thereof. For example, computer-readable storage media include magnetic media, optical storage media, and memory. Computer programs can also be distributed across network-connected computer systems, thereby allowing computer-readable code to be stored and executed in a distributed manner. The functional programs, code, and code segments used to implement the embodiments of this document can be readily deduced by a programmer in the art to which the embodiments of this document pertain.

[0092] The embodiments described in this document are intended to depict technical concepts, and the scope of the technical concepts in the embodiments described in this document is not limited to these embodiments. The scope of protection of the embodiments described in this document should be interpreted by the appended claims, and all technical concepts within their equivalent scope should be interpreted as being included within the scope of the embodiments described in this document.

[0093] <Detailed Description of Key Components>

[0094] 100: Battery management device, 100-0: Main battery management device. 100-1: First slave battery management device, 100-2: Second from the battery management device, 100-n: The Nth battery management device, 110: Measurement Department 120: Storage Department 130: Controller 200: Battery 200-1: First Battery 200-2: Second battery 200-n: The nth battery

Claims

1. A system for managing a battery installed in a vehicle, the system comprising: Multiple slave battery management devices, each slave battery management device corresponding to a multiple battery; and A main battery management device that receives data from the plurality of slave battery management devices and, in the event of a communication interruption with one or more of the plurality of batteries, acquires the relay status of the one or more batteries.

2. The system according to claim 1, wherein, The main battery management device obtains the relay status of the battery by using the current flowing through each of the plurality of batteries and the current flowing through the junction box on which the main battery management device is installed.

3. The system according to claim 2, wherein, When the current flowing through the junction box is greater than the sum of the currents flowing through each of the plurality of batteries, the main battery management device determines that there is a battery in which both the positive and negative relays have blown simultaneously.

4. The system according to claim 3, wherein, When the current flowing through the junction box is greater than the value obtained by adding a preset margin to the sum of the currents flowing through each of the plurality of batteries, the main battery management device determines that there is a battery in which both the positive and negative relays have blown simultaneously.

5. The system according to claim 3, wherein, When it is determined that both the positive and negative relays of a battery have blown simultaneously, the main battery management device provides a fault alarm message to the vehicle.

6. The system according to claim 1, wherein, When the vehicle is in wake-up mode, communication with one or more batteries is interrupted, and the voltage of the junction box is greater than or equal to a preset reference value, the main battery management device obtains the relay status of the battery.

7. The system according to claim 1, wherein, When the vehicle is in driving mode or charging mode, the main battery management device obtains the relay status of the battery.

8. The system according to claim 1, wherein, The main battery management device receives data from the slave battery management device via Controller Area Network (CAN) communication.

9. The system according to claim 1, wherein, The battery refers to one of the following: battery cell, battery cell pack, battery module, battery pack, and battery rack.

10. A method for managing a battery, the method being performed by a battery management system installed in a vehicle, the system comprising a plurality of slave battery management devices corresponding to a plurality of batteries and a master battery management device receiving data from the plurality of slave battery management devices, the method comprising: In the event of a communication interruption with one or more of the plurality of batteries, the main battery management device obtains the relay status of the one or more batteries.

11. The method according to claim 10, wherein, In the relay status acquisition operation, the relay status of the battery is acquired by using the current flowing through each of the plurality of batteries and the current flowing through the junction box where the main battery management device is installed.

12. The method according to claim 11, wherein, In the relay status acquisition operation, when the current flowing through the junction box is greater than the sum of the currents flowing through each of the plurality of batteries, it is determined that there is a battery in which both the positive and negative relays have blown simultaneously.

13. The method of claim 12, further comprising: When it is determined that there is a battery in which both the positive and negative relays have blown simultaneously, a fault alarm message is provided to the vehicle.

14. The method of claim 10, wherein, In the relay status acquisition operation, when the vehicle is in wake-up mode, communication with one or more batteries is interrupted, and the voltage of the junction box is greater than or equal to a preset reference value, the relay status of the battery is acquired.

15. A computer-readable storage medium having a program recorded thereon for performing on a computer the method for managing a battery according to any one of claims 10 to 14.

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