Battery system and interworking method in battery system

Abstract

A battery system according to an embodiment of the present invention comprises: lower control devices that individually control a plurality of batteries; and an upper control device that manages the plurality of lower control devices, wherein at least one of the lower control devices may identify the operating state of the battery system, and when the battery system is initialized and operating, may identify an identifier pre-stored in a storage space and perform initialization by itself.

Description

Battery systems and methods of interfacing in battery systems

[0001] This application claims the benefit of Korean Patent Application No. 10-2024-0054106 filed with the Korean Intellectual Property Office on April 23, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery system and a method of interworking in a battery system, and more particularly, to a battery system for interworking between control devices within the battery system and a method of operating the same.

[0003] An energy storage system (ESS) is a system that connects renewable energy, batteries that store electricity, and existing grid power.

[0004] With the recent expansion of smart grids and renewable energy and the emphasis on efficiency and stability of power systems, demand for energy storage systems is increasing.

[0005] Typically, an energy storage system is provided with a battery system comprising at least one battery pack and a battery rack.

[0006] In a battery system, battery management systems (BMSs) individually housed in at least one battery pack or battery rack communicate with each other to manage the batteries. Accordingly, the BMSs are required to assign identifiers for battery management during initial operation of the battery system.

[0007] Meanwhile, if an unexpected problem occurs in a specific battery management device during battery system operation, the conventional battery system diagnoses the condition of the specific battery management device and restarts the system based on the normal battery racks, excluding the specific battery rack corresponding to the specific battery management device with the problem. Consequently, the conventional battery system suffers from a drawback: energy efficiency is reduced by the amount of energy consumed by the excluded battery rack.

[0008] Accordingly, in recent years, in order to prevent a decrease in energy efficiency, when an unexpected problem occurs in a specific battery management device during the operation of a battery system, a technology has been provided to replace the specific battery rack in which the problem occurred with a new battery rack and apply it, or to reconnect the excluded specific battery rack after inspection to restart the battery system.

[0009] However, assigning identifiers to replaced or reconnected battery racks requires initialization of the entire battery system. Therefore, this technology also has the disadvantage of rendering the battery system unusable during the initialization process for assigning identifiers to battery racks.

[0010] The purpose of the present invention to solve the above problems is to provide a battery system.

[0011] Another object of the present invention to solve the above problems is to provide a linkage method in a battery system.

[0012] According to one embodiment of the present invention for achieving the above object, there is provided a battery system including lower control devices for individually controlling a plurality of batteries and an upper control device for managing the plurality of lower control devices, wherein at least one of the lower control devices checks the operating status of the battery system, and when the battery system is initialized and in operation, performs initialization by itself and sets an identifier pre-stored in a storage space.

[0013] At this time, the identifier may be an identifier assigned when the battery system is initialized.

[0014] Additionally, the lower control device can perform initialization by receiving an initialization command from the upper control device when the battery system is in an uninitialized state.

[0015] More specifically, the lower control device can be assigned an identifier from the upper control device when the battery system is in an uninitialized state and perform initialization by an initialization command of the upper control device.

[0016] At this time, the lower control device can update and store the identifier assigned from the upper control device in the storage space.

[0017] Meanwhile, the initialization command may be transmitted from the upper control device after the identifier assignment of the lower control devices by the upper control device is completed.

[0018] Additionally, the lower control device can receive at least one command from the upper control device via a physical internal signal (hardwired signal) or a communication signal.

[0019] Meanwhile, when the initialization of the lower control device is completed, the upper control device individually receives battery information from the lower control devices within the battery system, compares information of a specific battery corresponding to the lower control device for which initialization has been completed with the battery information, and controls the specific battery to be charged or discharged.

[0020] For example, the upper control device can control the specific battery to be charged when the voltage of the battery corresponding to the lower control device falls within a threshold range defined based on the voltages of the plurality of batteries corresponding to the plurality of lower control devices excluding the upper control device.

[0021] Additionally, the plurality of batteries may be provided in a parallel-connected structure.

[0022]

[0023] According to another embodiment of the present invention for achieving the above object, there is provided a method of interworking in a battery system including a plurality of lower control devices and an upper control system managing the same, the method comprising: a step of at least one of the lower control devices checking an operating state of the battery system; and a step of the at least one lower control device performing self-initialization and setting an identifier pre-stored in a storage space when the battery system is initialized and in operation.

[0024] At this time, the identifier may be an identifier assigned when the battery system is initialized.

[0025] Additionally, if the battery system is in an uninitialized state, the method may further include a step of receiving an initialization command from the upper control device and causing the lower control device to perform initialization.

[0026] Here, the step of performing initialization by the lower control device may include a step of assigning an identifier from the upper control device when the battery system is in an uninitialized state, and a step of performing initialization by the lower control device according to an initialization command of the upper control device.

[0027] Additionally, the step of the lower control device performing initialization may further include a step of the lower control device updating and storing the identifier allocated from the upper control device in the storage space.

[0028] Meanwhile, the initialization command may be transmitted from the upper control device after the identifier assignment of the lower control devices by the upper control device is completed.

[0029] Additionally, the lower control device can receive at least one command from the upper control device via a physical internal signal (hardwired signal) or a communication signal.

[0030] Meanwhile, the method of linking in a battery system may further include a step in which, when the initialization of the lower control device is completed, the upper control device individually receives battery information from the lower control devices in the battery system, and a step in which the upper control device compares information of a specific battery corresponding to the lower control device for which initialization has been completed with the battery information, and controls the specific battery to be charged or discharged.

[0031] For example, the step of electrically connecting the specific battery may include a step of controlling the specific battery to be charged when the voltage of the battery corresponding to the lower control device falls within a predetermined threshold range based on the voltages of the plurality of batteries corresponding to the plurality of lower control devices excluding the lower control device.

[0032] Additionally, the plurality of batteries may be provided in a parallel-connected structure.

[0033] According to an embodiment of the present invention, when a lower control device is restarted due to an unexpected abnormality, the battery system and the method for interlocking the lower control device are self-initialized and interlocked by identifier information pre-stored in the lower control device without initializing the entire battery system, thereby preventing the battery system from being interrupted and improving energy efficiency.

[0034] Figure 1 is a block diagram of an energy storage system to which the present invention can be applied.

[0035] Figure 2 is a block diagram of a battery system according to an embodiment of the present invention.

[0036] Figure 3 is a block diagram of an upper control device according to an embodiment of the present invention.

[0037] Figure 4 is a block diagram of a lower control device according to an embodiment of the present invention.

[0038] FIG. 5 is a flowchart for explaining a linking method in a battery system according to an embodiment of the present invention.

[0039] FIG. 6 is a flowchart for explaining a method of interlocking in a battery system when the battery system is in an uninitialized state, according to an embodiment of the present invention.

[0040] FIG. 7 is a flowchart for explaining a method of linking in a battery system when initialization of the battery system is completed, according to an embodiment of the present invention.

[0041] 10: BMS 20: BSC

[0042] 30: PCS 40: Grid

[0043] 50: Load 100: Battery System

[0044] 110: Upper control unit 120: Lower control unit

[0045] 111, 121: Memory 112, 122: Processor

[0046] 113, 121: Transmitter / receiver device 114, 124: Input interface device

[0047] 115, 125: Output interface device 116, 126: Storage device

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0052] 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.

[0053] Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the attached drawings.

[0054]

[0055] Figure 1 is a block diagram of an energy storage system to which the present invention can be applied.

[0056] Referring to Figure 1, the smallest unit of a battery that plays a role in storing power in an energy storage system (ESS) is typically a battery cell.

[0057] Typically, a battery pack is formed by a series / parallel combination of battery cells, and multiple battery packs can form a battery rack. In other words, a battery rack, consisting of a series / parallel combination of battery packs, can serve as the smallest unit of a battery system. Depending on the device or system in which the battery is used, a battery pack may also be referred to as a battery module.

[0058] Additionally, multiple battery racks can be connected in parallel to form a battery bank. For example, Battery #1, Battery #2, …, Battery #N illustrated in FIG. 1 may be in the form of battery modules.

[0059] At this time, a battery management device (BMS, 10) may be installed in each battery. The battery management device (10) monitors the current, voltage, and temperature of each battery pack (or rack) it manages, and calculates the SOC (State Of Charge) based on the monitoring results and controls charging and discharging.

[0060] Meanwhile, a battery system controller (BSC, 20) may be installed in each battery system comprising a plurality of batteries and peripheral circuits, devices, etc. Accordingly, the battery system controller (20) can monitor and control control targets such as voltage, current, temperature, circuit breakers, etc. within the battery system.

[0061] An inverter (Power Conditioning System; PCS, 30) can control power supplied from the grid (40) and power supplied from the battery (10) to supply power required from a load (50). For example, the inverter (30) can be provided as a DC-AC inverter.

[0062] Meanwhile, communication can be made between the battery, battery management device (10), inverter (30), grid (40), and load (50) using CAN (Controller Area Network) or Ethernet.

[0063]

[0064] Figure 2 is a block diagram of a battery system according to an embodiment of the present invention.

[0065] Referring to FIG. 2, the battery system (100) may include an upper control device (110) and a plurality of lower control devices (120). For example, the plurality of lower control devices (120) may include a first lower control device to an Nth lower control device.

[0066] Additionally, the battery system (100) may include a communication cable (130) connecting each of the upper control device (110) and the plurality of lower control devices (120). However, without being limited to the disclosed embodiment, the upper control device (110) and the plurality of lower control devices (120) within the battery system (100) may be interconnected by transmitting and receiving physical internal signals (hardwired signals). For example, the internal signal may be a voltage signal.

[0067] According to an embodiment, the upper control device (110) can control the operation of a plurality of lower control devices (120). For example, the upper control device (110) can be a battery system controller (BSC) or a battery bank management system (Bank BMS).

[0068] Meanwhile, in order for the upper control device (110) to control the operation of a plurality of lower control devices (120), a unique identifier must be assigned to each of the plurality of lower control devices (120).

[0069] Accordingly, the upper control device (110) can sequentially transmit an identifier assignment command to a plurality of lower control devices (120) via a communication cable (130) or a physical internal signal (hardwired signal) when initializing the battery system (100). Accordingly, the upper control device (110) can assign an identifier to each of the sequentially activated lower control devices (120).

[0070] Thereafter, the upper control device (110) can sequentially transmit an initialization command signal to each of the plurality of lower control devices (120) via a communication cable (130) or an internal signal (hardwired signal). Accordingly, the plurality of lower control devices (120) can be sequentially initialized and thus linked with the battery system (100).

[0071] Meanwhile, the lower control device (120) manages a battery corresponding to the lower control device (120) and can be controlled by the upper control device (110).

[0072] More specifically, a plurality of lower control devices (120) are provided, and can individually manage and control the operation of corresponding batteries among the plurality of batteries. Here, the batteries are provided in multiple units and may be provided in a parallel-connected structure. For example, the batteries may be provided as a battery rack including a plurality of battery modules. Accordingly, the lower control devices (120) may be provided as a battery rack management device (Rack BMS) that manages the battery rack.

[0073] The lower control device (120) can be initialized to link with the upper control device (110) when the battery system (100) is initialized.

[0074] According to one embodiment, the lower control device (120) may be assigned an identifier by an identifier assignment command from the upper control device (110). At this time, the lower control device (120) may store the assigned identifier information in a separate storage space. For example, the storage space may be a non-volatile memory (Flash memory) and may be provided as a storage device (126) in FIG. 4, which will be described later.

[0075] Thereafter, the lower control device (120) can be initialized by an initialization command of the upper control device (110). Accordingly, the lower control device (120) can be linked with the battery system (100) through the upper control device (110).

[0076] Meanwhile, the lower control device (120) may be unintentionally reset during operation of the battery system (100) after initialization is completed.

[0077] At this time, the lower control device (120) can check the identifier stored in the storage space to reset the identifier, according to another embodiment.

[0078] Here, the identifier may be a unique identifier of the lower control device (120) assigned from the upper control device (110) when the battery system (100) is initialized. Thereafter, the lower control device (120) can perform initialization on its own without an initialization command from the upper control device (110).

[0079] In summary, the battery system (100) according to the embodiment of the present invention can reset the identifier pre-stored in the storage space as the identifier of the lower control device (120) even if the lower control device (120) is unexpectedly reset due to an abnormality in hardware or software after the initialization of the battery system (100) by pre-storing identifier information assigned when the battery system (100) is initialized. Accordingly, the battery system (100) can reset the identifier of the lower control device (120) without having to re-initialize the entire battery system (100), thereby enabling communication linkage between the upper control device (110) and the lower control device (120).

[0080]

[0081] Figure 3 is a block diagram of an upper control device according to an embodiment of the present invention.

[0082] Referring to FIG. 3, each of the upper control devices (110) may include a memory (111), a processor (112), a transmission / reception device (113), an input interface device (114), an output interface device (115), and a storage device (116).

[0083] According to an embodiment, each of the components (111, 112, 113, 114, 115, 116) included in the upper control device (110) may be connected to each other by a bus and communicate with each other. Here, the bus may be a CAN bus.

[0084] Among the components (111, 112, 113, 114, 115, 116) of the upper control device (110), the memory (111) and the storage device (116) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (111) and the storage device (116) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0085] Among these, the memory (111) may include at least one command executed by the processor (112).

[0086] According to an embodiment, at least one command within the upper control device (110) may include a command to transmit an identifier assignment command to each of the plurality of lower control devices (120) when the battery system (100) is in an uninitialized state.

[0087] Thereafter, at least one command may include a command to transmit an initialization command to each of the lower control devices (120).

[0088] Thereafter, at least one command may further include a command to individually receive battery information from a plurality of lower control devices (120) within the battery system (100) when the initialization of the lower control devices (120) is completed, and a command to compare information of a specific battery corresponding to the lower control device (120) for which initialization has been completed with the battery information and control the specific battery to be charged or discharged. For example, the upper control device (110) may control the specific battery to be charged when the voltage of the battery corresponding to the lower control device (120) falls within a threshold range defined in advance based on the voltages of a plurality of batteries corresponding to the plurality of lower control devices (120) excluding the upper control device (110).

[0089] The processor (112) may mean 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.

[0090] As described above, the processor (112) can execute at least one program command stored in the memory (111).

[0091]

[0092] Figure 4 is a block diagram of a lower control device according to an embodiment of the present invention.

[0093] Referring to FIG. 4, the lower control device (120) may include a memory (121), a processor (122), a transmission / reception device (123), an input interface device (124), an output interface device (125), and a storage device (126).

[0094] According to an embodiment, each of the components (121, 122, 123, 124, 125, 126) included in the lower control device (120) may be connected to each other by a bus and communicate with each other. Here, the bus may be a CAN bus.

[0095] Among the components (121, 122, 123, 124, 125, 126) of the lower control device (120), the memory (121) and the storage device (126) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (121) and the storage device (126) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0096] Among these, the memory (121) may include at least one command executed by the processor (122).

[0097] According to an embodiment, the at least one command may include a command to check the operating status of the battery system (100) and a command to perform self-initialization and set an identifier pre-stored in a storage space when the battery system (100) is initialized and in operation. For example, the storage space may be the storage device (126).

[0098] At this time, the identifier may be an identifier assigned when the battery system (100) is initialized.

[0099] Meanwhile, the at least one command may further include a command to perform initialization by receiving an initialization command from the upper control device (110) when the battery system (100) is not in operation.

[0100] More specifically, the lower control device (120) can be assigned an identifier from the upper control device (110) when the battery system (100) is not in operation, and perform initialization by an initialization command of the upper control device (110).

[0101] Additionally, the at least one command may update and store the identifier assigned from the upper control device (110) in the storage space.

[0102] Meanwhile, the initialization command can be transmitted from the upper control device (110) after the identifier allocation of the lower control devices (120) by the upper control device (110) is completed.

[0103] Additionally, the lower control device (120) can receive at least one command from the upper control device (110) through a physical internal signal (hardwired signal) or a communication signal.

[0104] Additionally, the plurality of batteries may be provided in a parallel-connected structure.

[0105] The processor (122) may mean 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.

[0106] As described above, the processor (122) can execute at least one program command stored in the memory (121).

[0107] The configurations of the battery system according to an embodiment of the present invention have been described above. Below, the method of interworking the lower-level control devices in the battery system will be described in detail.

[0108]

[0109] FIG. 5 is a flowchart for explaining a linking method in a battery system according to an embodiment of the present invention.

[0110] Referring to FIG. 5, the lower control device (120) can check the operating status of the battery system (100) (S510).

[0111] According to an embodiment, the lower control device (120) can check the operating status before and after initialization of the battery system (100) depending on whether or not a status information signal transmitted from the upper control device (110) is received.

[0112] To be more specific, the status information signal may be a signal transmitted from the upper control device (110) to the lower control device (120) after the initialization of the battery system (100) is completed.

[0113] According to one embodiment, if the lower control device (120) does not receive a status information signal because the status information signal is not transmitted from the upper control device (110), it may determine that the initialization of the battery system (100) has not been completed.

[0114] According to another embodiment, when the lower control device (120) receives a status information signal transmitted from the upper control device (110), it can determine that the initialization of the battery system (100) is complete. In other words, when the lower control device (120) receives a status information signal from the upper control device (110), it can determine that the battery system (100) is in operation.

[0115] Afterwards, the lower control device (120) can perform initialization depending on whether the battery system (100) is initialized (S520).

[0116]

[0117] FIG. 6 is a flowchart for explaining a method of interlocking in a battery system when the battery system is in an uninitialized state, according to an embodiment of the present invention.

[0118] Referring to FIG. 6, when the battery system (100) is in an uninitialized state, that is, when it is determined that the initialization of the battery system (100) is not in progress, the lower control device (120) can wait until an identifier assignment command is received from the upper control device (110).

[0119] Afterwards, when an identifier is assigned from the upper control device (110) (S610), the lower control device (120) can store the assigned identifier in a separate storage space (S620).

[0120] Thereafter, the lower control device (120) may wait until an initialization command is received from the upper control device (110). Here, the initialization command may be sequentially transmitted from the upper control device (110) to each of the lower control devices (120) when identifier assignment for the lower control devices (120) within the battery system (100) is completed.

[0121] Thereafter, when an initialization command is received from the upper control device (110) (S630), the lower control device (120) can perform initialization using the identifier stored in the storage space (S640).

[0122] Afterwards, when the initialization of the plurality of sub-control devices (120) is completed, the initialization of the battery system (100) can be completed.

[0123]

[0124] FIG. 7 is a flowchart for explaining a method of linking in a battery system when initialization of the battery system is completed, according to an embodiment of the present invention.

[0125] Referring to FIG. 7, when the initialization of the battery system (100) is completed, the lower control device (120) can determine that the lower control device (120) is currently in a state of being reset due to an abnormality in hardware or software.

[0126] Accordingly, the lower control device (120) can check the identifier information pre-assigned to the lower control device (120) when the battery system (100) is initialized (S710). Here, the pre-assigned identifier information can be stored in a separate storage space.

[0127] Afterwards, the lower control device (120) can reset the pre-assigned identifier information to a new identifier of the lower control device (120) (S720).

[0128] Thereafter, the lower control device (120) can be linked with the upper control device (110) by performing initialization on its own (S730) without an initialization command from the upper control device (110).

[0129] In summary, the battery system (100) according to an embodiment of the present invention can reset the identifier using the identifier information pre-stored in the corresponding lower control device (120) and perform self-initialization when the lower control device (120) is reset due to an unexpected abnormality. Therefore, the battery system (100) according to an embodiment of the present invention can enable communication between the upper control device (110) and a plurality of lower control devices (120) by performing identifier allocation for the restarted lower control device (120) without initializing the entire battery system (100).

[0130] In addition, after the initialization of the lower control device (120) is completed, the upper control device (110) can individually receive battery information from a plurality of lower control devices (120) within the battery system (100). Here, the battery information may be real-time voltage value information of a plurality of batteries individually connected to a plurality of lower control devices (120). For example, the battery information may be state of charge (SOC) information of each of the plurality of batteries.

[0131] Thereafter, the upper control device (110) can compare the battery information of the lower control device (110) for which initialization has been completed and a plurality of lower control devices (110) excluding the lower control device (110) to perform charge / discharge control on a specific battery corresponding to the lower control device (110) for which initialization has been completed.

[0132] For example, the upper control device (110) can check the charging status of a specific battery corresponding to a specific lower control device (120) for which initialization has been completed.

[0133] Thereafter, the upper control device (110) can control the switch of the battery protection unit (BPU) in the lower control device (120) that is in the OFF state to the ON state when the charging state of the specific battery is within a predefined range based on the charging states of the plurality of batteries. Accordingly, the specific battery corresponding to the specific lower control device (120) for which initialization has been completed can be charged.

[0134]

[0135] The battery system and the method of linking in the battery system according to the embodiment of the present invention have been described above.

[0136] According to an embodiment of the present invention, when a lower control device is restarted due to an unexpected abnormality, the battery system and the method for interlocking in the battery system can be re-interlocked with the upper control device in the battery system by initializing the lower control device itself using identifier information pre-stored in the lower control device without initializing the entire battery system.

[0137]

[0138] 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.

[0139] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by the computer using an interpreter, etc.

[0140] 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.

[0141] 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. Sub-control devices that individually control multiple batteries; and A battery system including an upper control device that manages the plurality of lower control devices, At least one of the above sub-control devices, Check the operating status of the above battery system, A battery system that, when the above battery system is initialized and in operation, performs self-initialization and sets a pre-stored identifier in the storage space.

2. In claim 1, A battery system, wherein the above identifier is an identifier assigned when the battery system is initialized.

3. In claim 1, The above sub-control device, A battery system that performs initialization by receiving an initialization command from the upper control device when the above battery system is in an uninitialized state.

4. In claim 3, The above sub-control device, A battery system, wherein, when the above battery system is in an uninitialized state, an identifier is assigned from the upper control device and initialization is performed by an initialization command of the upper control device.

5. In claim 4, The above sub-control device, A battery system that updates and stores the identifier assigned from the upper control device in the storage space.

6. In claim 1, The above initialization command is, A battery system transmitted from the upper control device after the identifier assignment of the lower control devices by the upper control device is completed.

7. In claim 3, The above sub-control device, A battery system that receives at least one command from the upper control device via a physical internal signal (hardwired signal) or a communication signal.

8. In claim 1, The above upper control device, When the initialization of the above sub-control devices is completed, battery information is individually received from the above sub-control devices in the battery system, A battery system that compares information of a specific battery corresponding to the sub-control device for which initialization has been completed with the battery information and controls the specific battery to be charged or discharged.

9. In claim 8, The above upper control device, A battery system that controls the specific battery to be charged when the voltage of the battery corresponding to the above-mentioned lower control device falls within a predetermined threshold range based on the voltages of a plurality of batteries corresponding to the plurality of lower control devices excluding the above-mentioned lower control device.

10. In claim 1, A battery system wherein the above plurality of batteries are provided in a structure connected in parallel.

11. A method of linking in a battery system, including a plurality of lower control devices and an upper control system managing the same, A step of at least one of the sub-control devices checking the operating status of the battery system; and A method of interworking in a battery system, wherein when the battery system is initialized and in operation, the at least one sub-control device performs initialization by itself and sets an identifier stored in a storage space.

12. In claim 11, A method of linking in a battery system, wherein the above identifier is an identifier assigned when the battery system is initialized.

13. In claim 11, A method of interlocking in a battery system, further comprising the step of receiving an initialization command from the upper control device and causing the lower control device to perform initialization when the battery system is in an uninitialized state.

14. In claim 13, The step in which the above sub-control device performs initialization is as follows: When the above battery system is in an uninitialized state, a step of assigning an identifier from the upper control device; and A method of interlocking in a battery system, comprising a step of initializing the lower control device by an initialization command of the upper control device.

15. In claim 14, The step in which the above sub-control device performs initialization is as follows: A method of interworking in a battery system, further comprising a step of updating and storing the identifier assigned from the upper control device in the storage space by the lower control device.

16. In claim 11, The above initialization command is, A method of linking in a battery system, transmitted from the upper control device after the identifier assignment of the lower control devices by the upper control device is completed.

17. In claim 13, The above sub-control device, A method of interworking in a battery system, wherein at least one command is received from the upper control device via a physical internal signal (hardwired signal) or a communication signal.

18. In claim 11, When the initialization of the lower control device is completed, the upper control device individually receives battery information from the lower control devices within the battery system; and A method of linking in a battery system, further comprising a step of comparing information of a specific battery corresponding to the lower control device for which initialization has been completed with the battery information, and controlling the specific battery to be charged or discharged.

19. In claim 18, The step of electrically connecting the above specific battery comprises: A method of interlocking in a battery system, comprising a step of controlling a specific battery to be charged when the voltage of the battery corresponding to the lower control device falls within a predetermined threshold range based on the voltages of a plurality of batteries corresponding to the plurality of lower control devices excluding the lower control device.

20. In claim 11, A method of interconnection in a battery system, wherein the above plurality of batteries are provided in a parallel-connected structure.

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