Battery Information Management System and Method

Abstract

A battery information management system according to an embodiment includes a communication device that receives information about a battery rack from a Rack Battery Management System (RBMS) that controls the battery rack, a switch that is connected to the communication device via a local area network and receives information about the battery rack from the communication device, and a controller that receives information about the battery rack from the switch. According to the embodiment, information about all battery cells can be collected and managed regardless of communication speed or data capacity. Therefore, when an abnormality occurs in the system, the battery cell causing the abnormality can be easily found, and only the corresponding battery cell / module can be replaced, thereby reducing repair and maintenance costs.

Description

Technical Field

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2021-0172221 filed on December 03, 2021, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The embodiments disclosed in this document relate to a battery information management system and a battery information management method using the same.

Background Art

[0003] An energy storage system (ESS) is a system that stores electrical energy and manages it so that it can be used when needed. Generally, an energy storage system installed in a power plant that drives a large-scale power grid or a building with a large power consumption includes hundreds to thousands of battery cells. To systematically manage such battery cells, a plurality of battery cells are grouped to form a battery module, and a plurality of battery modules are grouped to form a battery rack. The energy storage system includes a plurality of such battery racks, and an MBMS (Module Battery Management System) and an RBMS (Rack Battery Management System) are provided to control each battery module and battery rack and monitor their states. At the top layer, a BSC (Battery System Controller) is provided to integrally manage a plurality of battery-related information received from the MBMS and RBMS and control the entire battery system.

[0004] The BSC must monitor data related to hundreds to thousands of battery cells at any time (usually at a one-second interval) for the smooth operation of the power storage system. Since there are limitations in communication speed and data capacity for processing all the data, it is common to selectively receive and process only important data (e.g., maximum / minimum cell voltage, module temperature, state of charge (SOC), etc.). However, in this case, since all battery cells cannot be precisely monitored, there is a problem that it is difficult to discover which battery cell is the cause of the problem when an abnormality occurs in the power storage system.

Summary of the Invention

Problems to be Solved by the Invention

[0005] One object of the embodiments disclosed in this document is to provide a battery information management system and a battery information management method capable of monitoring data of all battery cells constituting a power storage system at any time.

[0006] Another object of the embodiments disclosed in this document is to enable easy search for the battery cell that causes an abnormality when an abnormality occurs in the system by storing information of all battery cells in a storage device.

[0007] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description.

Means for Solving the Problems

[0008] A battery information management system according to an embodiment includes a communication device that receives information related to the battery rack from an RBMS (Rack Battery Management System) that controls the battery rack, a switch connected to the communication device via a local area network and receiving the information related to the battery rack from the communication device, and a controller that receives the information related to the battery rack from the switch.

[0009] In a battery information management system according to an embodiment, the battery rack includes at least one battery module, each of the battery modules includes at least one battery cell, and information about the battery rack can include information about each of the battery cells.

[0010] In a battery information management system according to an embodiment, each of the battery modules is controlled by an MBMS (Module Battery Management System), and the RBMS and the MBMS can perform CAN (Controller Area Network) communication to transmit and receive information about each of the battery cells.

[0011] In a battery information management system according to an embodiment, the communication device can change CAN communication data between the RBMS and the MBMS into TCP / IP packets and transmit them to the switch.

[0012] In a battery information management system according to an embodiment, the communication device is assigned an IP in the DHCP (Dynamic Host Configuration Protocol) method, communicates with the switch based on the assigned IP, and the switch can be configured to enable IP assignment by the DHCP method.

[0013] In a battery information management system according to an embodiment, the controller can be configured to store information about each of the battery cells in a storage device. In a battery information management system according to an embodiment, the period during which the controller stores information about each of the battery cells may be within 1 second.

[0014] In a battery information management system according to an embodiment, the controller can be configured to determine whether there is an abnormality in the battery cells based on the information about each of the battery cells stored in the storage device.

[0015] A power storage system according to an embodiment includes at least one battery rack, at least one RBMS (Rack Battery Management System) that controls each of the at least one battery rack, and a battery information management system that manages information regarding the at least one battery rack. The battery information management system includes at least one communication device that receives information regarding the battery rack controlled by each RBMS from each of the RBMSs, a switch connected to the at least one communication device via a local area network and receiving the information regarding the battery rack from the communication device, and a controller that receives the information regarding the battery rack from the switch.

[0016] In a power storage system according to an embodiment, each of the battery racks includes at least one battery module, each of the battery modules includes at least one battery cell, and the information regarding the battery rack can include information regarding each of the battery cells.

[0017] A power storage system according to an embodiment further includes at least one MBMS (Module Battery Management System) that controls each of the at least one battery module, and the RBMS and the MBMS can perform CAN (Controller Area Network) communication to transmit and receive information regarding each of the battery cells.

[0018] In a power storage system according to an embodiment, the communication device can change CAN communication data between the RBMS and the MBMS into TCP / IP packets and transmit them to the switch.

[0019] In a power storage system according to an embodiment, the communication device is assigned an IP in the DHCP (Dynamic Host Configuration Protocol) method, and communicates with the switch based on the assigned IP, and the switch can be configured to enable IP assignment by the DHCP method.

[0020] A power storage system according to an embodiment further includes a storage device that stores information regarding each of the battery cells, and the controller can be configured to store information regarding each of the battery cells in the storage device. In a power storage system according to an embodiment, the period during which the controller stores information regarding each of the battery cells may be within 1 second.

[0021] In a power storage system according to an embodiment, when an abnormality occurs in the power storage system, the controller can be configured to determine the presence or absence of an abnormality in the battery cells based on the information regarding each of the battery cells stored in the storage device.

[0022] A battery information management method according to an embodiment includes a step in which a communication device receives information regarding a battery rack from an RBMS (Rack Battery Management System) that controls the battery rack, a step in which a switch connected to the communication device via a local area network receives the information regarding the battery rack from the communication device, and a step in which a controller receives the information regarding the battery rack from the switch.

[0023] In a battery information management method according to an embodiment, the battery rack includes at least one battery module, each of the battery modules includes at least one battery cell, and the information regarding the battery rack can include information regarding each of the battery cells.

[0024] The battery information management method according to an embodiment may further include a step of the controller storing information regarding each of the battery cells in a storage device. The battery information management method according to an embodiment may further include a step of the controller determining whether there is an abnormality in the battery cell based on the information regarding each of the battery cells stored in the storage device.

Advantages of the Invention

[0025] According to an embodiment, there is provided a battery information management system capable of integrally managing information of all battery cells by using an RBMS that controls a battery rack, a communication device respectively connected to the RBMS, and a switch that receives information regarding each battery cell from the communication device via a local area network and transmits the information to a controller.

[0026] According to the proposed system, compared with a conventional system in which a controller directly collects battery-related information from an RBMS, it is possible to collect and manage information of all battery cells regardless of communication speed and data capacity. Therefore, when an abnormality occurs in the system, it is possible to easily find the battery cell that causes the abnormality, and only the battery cell / module can be replaced to reduce repair and maintenance costs. In addition to this, various effects that can be directly or indirectly grasped are provided by this document.

Brief Description of the Drawings

[0027] To more clearly explain the embodiments or technical solutions of the prior art disclosed in this document, the drawings necessary for the description of the embodiments are briefly introduced below. It should be understood that the following drawings are only for explaining the embodiments of this specification and are not for limitation. Also, for the sake of clarity of the description, the representation of some components in the drawings may be exaggerated or omitted.

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0029] Hereinafter, the embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When attaching reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible when they appear on other drawings. In addition, when explaining the embodiments disclosed in this document, if a specific explanation of a related known configuration or function is determined to impede the understanding of the embodiments disclosed in this document, the detailed explanation thereof will be omitted.

[0030] The terms used in this document are selected as general terms that are widely used currently as much as possible while considering their functions. However, this may vary depending on the intentions or conventions of those skilled in the art or the emergence of new technologies. Also, in certain cases, there are terms arbitrarily selected by the applicant, and in such cases, the meaning thereof is described in the explanation part of the specification. Therefore, it is clarified that the terms used in this document should not be construed merely as the names of the terms, but should be interpreted based on the substantial meaning of the terms and the content throughout this document.

[0031] The terms used in this document are merely used to describe specific embodiments and are not intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0032] FIG. 1 is a block diagram showing the configuration of a power storage system including a battery information management system according to an embodiment. Referring to FIG. 1, a power storage system 1 according to an embodiment includes a plurality of battery racks 101, 102, 103, 104, a plurality of RBMSs (Rack Battery Monitoring Systems) 111, 112, 113, 114 that control the plurality of battery racks 101, 102, 103, 104 respectively, a battery information management system 10 that manages information related to the battery, and a storage device 150 that stores information related to the battery.

[0033] The battery information management system 10 according to an embodiment includes at least one communication device 121, 122, 123, 124 that receives information related to the battery rack from the RBMSs 111, 112, 113, 114, a switch 130 that receives information related to the battery rack from the communication device, and a controller 140 that receives information related to the battery rack from the switch 130.

[0034] Only four battery racks 101, 102, 103, 104, four RBMSs 111, 112, 113, 114, and four communication devices 121, 122, 123, 124 are shown in FIG. 1, but this is merely an exemplary configuration, and the number of each component is not limited to the shown number, and there may be a greater or smaller number of components.

[0035] FIG. 2 is a block diagram showing the configuration of a power storage system according to the prior art. Referring to FIG. 2, a power storage system 2 includes a plurality of battery racks 201, 202, 203, 204, a plurality of RBMSs 211, 212, 213, 214 that control the plurality of battery racks 201, 202, 203, 204 respectively, a controller 240 that receives and manages information related to the battery from the RBMS, and a storage device 250 that stores information related to the battery.

[0036] The most significant structural difference between the power storage system 1 of the embodiment and the conventional power storage system 2 is that it includes additional communication devices 121, 122, 123, 124 connected to their respective RBMSs, and a switch 130 that receives information about all batteries from the communication devices and transmits it to the controller 140. These components communicate in a different manner from the conventional system to enable the collection and management of information related to the battery cells.

[0037] A battery rack is a device for loading and managing a collection of multiple battery modules, and is controlled by a rack battery management system (RBMS) provided in the battery rack. As shown in FIG. 1, the power storage system 1 can include one or more battery racks 101, 102, 103, 104, and the RBMSs 111, 112, 113, 114 provided in each battery rack control the battery rack and collect information about the battery modules and battery cells included in the battery rack.

[0038] FIG. 3 is a block diagram showing the configuration of a battery rack included in a power storage system according to an embodiment. Referring to FIG. 3, a battery rack 101 according to an embodiment can include at least one battery module (M1, M2, M3, M4,...). Each battery module (M1) can include at least one battery cell (C11, C12, C13, C14, C15,...).

[0039] Battery cells (C11, C12, C13, C14, C15,...) are the basic units of batteries configured to be able to charge and discharge electrical energy, and are produced by putting components such as a positive electrode, a negative electrode, a separator, and an electrolyte into a pouch, cylindrical, or rectangular case. According to the embodiment, the battery cells may be, but are not limited to, lithium-ion (Li-ion) batteries, lithium-ion polymer (Li-ion polymer) batteries, nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, etc.

[0040] Battery modules (M1, M2, M3, M4, ...) each contain a plurality of battery cells (C11~C15, C21~C25, C31~C35, C41~C45, ...), and are assemblies in which a certain number of them are bundled and placed in a frame to protect the battery cells from external impacts, heat, vibration, etc. and manage information. The battery modules (M1, M2, M3, M4, ...) are each controlled by a module battery management system (MBMS) (S1, S2, S3, S4, ...). According to an embodiment, the MBMS (S1) controls and manages the battery module (M1), and collects information about the battery cells (C11, C12, C13, C14, C15, ...) that make up the battery module (M1), such as the voltage, current, temperature, resistance, SOC (State of Charge), SOH (State of Health), etc. of each battery cell, and transmits it to an external device of the module.

[0041] Referring to FIG. 3, the MBMS (S1, S2, S3, S4, ...) communicates with an RBMS111 that controls a battery rack 101, which is a higher-level group of the battery modules controlled by each of them, and transmits the state information of the battery cells collected at regular intervals (for example, every 1 second) to the RBMS111. According to an embodiment, the MBMS (S1, S2, S3, S4, ...) and the RBMS111 can exchange data in a CAN (Controller Area Network) communication method. CAN communication is a communication protocol standard designed for controllers and devices to communicate with each other without a host computer within a system. It has the advantages of being very resistant to electrical noise and being able to configure a communication system at low cost. CAN communication is only an example, and the communication method between the RBMS and the MBMS is not limited to this.

[0042] Referring back to FIG. 1, the RBMSs 111, 112, 113, 114 each receive information regarding the battery racks from the connected battery racks 101, 102, 103, 104. More specifically, as shown in FIG. 3, they communicate with the MBMSs (S1, S2, S3, S4,...) that control the battery modules included in the battery racks using CAN communication, and receive information regarding the battery modules and information regarding the battery cells from the MBMSs. That is, the information regarding the battery racks includes information regarding each of the battery cells included in the battery racks.

[0043] At least one of the communication devices 121, 122, 123, 124 constituting the battery information management system 10 each receives information regarding the battery racks including information regarding the battery cells from the RBMSs 111, 112, 113, 114. At this time, the RBMSs 111, 112, 113, 114 and the communication devices 121, 122, 123, 124 can communicate with each other using the CAN communication method, but are not limited thereto. The communication devices 121, 122, 123, 124 each transmit information regarding their respective battery racks to the switch 130 using a local area network.

[0044] According to one embodiment, the communication devices 121, 122, 123, 124 are CAN-to-Ethernet communication devices, and can change the CAN messages including the battery information received from the RBMS into TCP / IP packets and transmit them to the switch 130 via an Ethernet network. For this purpose, the communication devices and the switch can be connected by a wired or wireless LAN (Local Area Network), and it is possible to transmit and receive data of several tens to several thousand Mbit per second from a much farther distance compared to CAN communication. In the embodiment, it has been described that the communication devices and the switch transmit and receive data using an Ethernet network and the TCP / IP protocol, but it is not limited to the communication methods described above.

[0045] Switch 130 receives information regarding the battery rack (including information regarding battery cells) from communication devices 121, 122, 123, and 124 via a local area network (e.g., Ethernet). According to one embodiment, Switch 130 receives battery-related information in the form of TCP / IP packets from the communication devices and transmits the information in the form of TCP / IP packets to Controller 140 via the Ethernet network. As shown in FIG. 1, Switch 130 serves as a switch hub that receives information from a plurality of communication devices 121, 122, 123, and 124 connected via a plurality of ports and selectively, sequentially, or simultaneously transmits the information to Controller 140.

[0046] According to one embodiment, communication devices 121, 122, 123, and 124 are assigned IPs in the DHCP (Dynamic Host Configuration Protocol) manner, communicate with Switch 130 based on the assigned IPs, and Switch 130 can be configured to enable IP assignment by the DHCP method. That is, Switch 130 automatically assigns an IP to a communication device that needs an IP, requests the communication device to return the IP if it is not used, and makes it available for other devices to use.

[0047] Controller 140 receives information regarding the battery rack (including information regarding battery cells) from Switch 130. As described above, the information can be received in the form of TCP / IP packets via the Ethernet network, but is not limited thereto. Controller 140 includes an arithmetic unit for processing information transmitted from a lower-level battery management system (such as MBMS and RBMS) and a control unit for controlling the lower-level battery management system (MBMS and RBMS) based on the processing result, and may be a BSC (Battery System Controller) used in a general battery control system.

[0048] According to one embodiment, the controller 140 can receive information from the switch 130 via a local area network (e.g., Ethernet) (see the dotted line connecting the switch and the controller in FIG. 1), and at the same time, or alternatively, directly receive information regarding the battery racks from the RBMSs 111, 112, 113, 114 (see the solid line connecting the RBMS and the controller in FIG. 1). At this time, for direct communication with the RBMS, a CAN communication method can be utilized instead of Ethernet.

[0049] Referring to FIG. 1 again, the power storage system 1 according to one embodiment further includes a storage device 150 that stores information regarding each battery cell, and the controller 140 can be configured to store the information regarding each battery cell in the storage device 150. The storage device 150 may be, for example, a semiconductor memory such as a RAM, a ROM, or a flash memory, a magnetic disk, an optical disk, or other various storage media, and may also be a concept including an additional device capable of performing data processing, transmission, and display operations together with the storage media. According to other embodiments, the storage device 150 may be a device or system located outside the power storage system 1 (e.g., an external terminal connected via a network, a cloud server, etc.).

[0050] According to one embodiment, the controller 140 can store CAN-to-Ethernet transmission data in the storage device 150 every cycle using a logging program installed in the system (e.g., ModuleLogReceiver (trademark) developed by LGES). The period for the controller 140 to store the information regarding each battery cell can preferably be set within 1 second, but is not limited thereto.

[0051] As shown in FIG. 2, in the prior art power storage system 2, the controller 240 received information from the RBMSs 211, 212, 213, 214 by direct communication such as CAN communication. However, in the case of CAN communication, due to the limitations of communication speed and data capacity, only important battery data (e.g., maximum / minimum cell voltage, module temperature, state of charge (SOC), etc.) had to be selectively received. In contrast, the power storage system 1 according to the embodiment of FIG. 1 uses additional communication devices 121, 122, 123, 124 and switches 130 connected to the respective RBMSs to transmit information to the controller 140 via a local area network such as Ethernet, thereby overcoming the limitations of communication speed and data capacity and being able to collect and manage all battery cell information.

[0052] By recording all battery cell data in real time in this way, it is possible to easily respond when an abnormality occurs in the power storage system. For example, the controller 140 can be configured to read information regarding each of the battery cells stored in the storage device 150 and determine the presence or absence of an abnormality in the battery cells when an abnormality occurs in the power storage system 1. In this case, the relevance between the abnormality of the entire system and the abnormality of the battery cells can be determined according to a predetermined criterion or based on an input from the administrator. When an abnormality of the battery cells is determined, the position (position within a specific battery module in a specific battery rack) and status record information of the battery can be transmitted to the administrator terminal. The administrator can significantly reduce the repair cost and time of the power storage system by replacing only the identified abnormal battery cells.

[0053] FIG. 4 is a flowchart showing a battery information management method according to an embodiment. Referring to FIG. 4, first, a step (S100) is performed in which a communication device receives information regarding a battery rack from an RBMS that controls the battery rack. As described above, the power storage system includes at least one battery rack, and each battery rack is controlled by at least one RBMS. As described with reference to FIG. 3, each battery rack includes at least one battery module, and each battery module includes at least one battery cell. Information regarding the battery rack collected by the RBMS includes information on individual battery cells, such as the voltage, current, temperature, resistance, SOC (State of Charge), SOH (State of Health), etc. of each battery cell. The RBMS that manages the battery rack and the MBMS that manages the battery module can transmit and receive data in a CAN communication method, and each communication device and the RBMS can also transmit and receive data in a CAN communication method.

[0054] Next, a step (S200) is performed in which a switch connected to the communication device via a local area network receives information regarding the battery rack (including information regarding battery cells) from the communication device. According to an embodiment, the communication device is a CAN-to-Ethernet communication device, and can change a CAN message including battery information received from the RBMS into a TCP / IP packet and transmit it to the switch via an Ethernet network. The switch serves as a switch hub that receives information from a plurality of communication devices connected via a plurality of ports and selectively, sequentially, or simultaneously transmits it to the controller. Also, the switch can be configured to support a DHCP function and be able to assign IP addresses to necessary communication devices.

[0055] Next, a step (S300) is performed in which the controller receives information regarding the battery rack (including information regarding battery cells) from the switch. According to one embodiment, the switch transmits the information to the controller in the form of TCP / IP packets via a local area network (e.g., Ethernet). The controller includes an arithmetic unit for processing information transmitted from a lower battery management system (such as MBMS, RBMS), and a control unit for controlling the lower battery management system (MBMS, RBMS) based on the processing result, and may be a BSC (Battery System Controller) used in a general battery control system.

[0056] Next, a step (S400) is performed in which the controller stores information regarding each battery cell in a storage device. The storage device may be, for example, a semiconductor memory such as RAM, ROM, flash memory, or various storage media such as magnetic disks and optical disks, and may be a concept including an additional device capable of performing data processing, transmission, and display operations together with the storage media. The controller receives information regarding all battery cells at a defined period (preferably within 1 second) and records it in the storage device.

[0057] According to one embodiment, the battery information management method may further include a step (S500) in which, when an abnormality occurs in the system, the controller determines the presence or absence of an abnormality in the battery cells based on the information regarding each battery cell stored in the storage device. By recording all battery cell data in the storage device in this way, it is possible to easily respond when an abnormality occurs in the power storage system. If it is determined that there is an abnormality in the battery cell, the position of the battery (the position within a specific battery module of a specific battery rack) and the status recording information can be transmitted to the administrator terminal, and the administrator can significantly reduce the repair cost and time of the power storage system by replacing only the identified abnormal battery cell.

[0058] The battery information management method according to the above-described embodiment can be realized by an application or in the form of program instruction words executable via various computer components, and can be recorded on a computer-readable recording medium. The computer-readable recording medium can include program instruction words, data files, data structures, etc. alone or in combination.

[0059] Just because all the components constituting the embodiment have been described as being combined into one or operating in combination, it is not necessarily limited to such an embodiment. Within the scope of the purpose, all the components may selectively be combined into one or more and operate. Also, terms such as "including", "constituting", or "having" described above should be construed to mean that the component can be inherent, unless otherwise stated to the contrary, and not to exclude other components, but rather may further include other components.

[0060] The above description is merely an illustrative explanation of the technical idea disclosed in this document. Those having ordinary knowledge in the technical field to which the embodiments disclosed in this document belong can make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0061] Therefore, the embodiments disclosed in this document are not for limiting the technical idea disclosed in this document but for explaining it, and the scope of the technical idea disclosed in this document is not limited by such embodiments. The protection scope of the technical idea disclosed in this document should be interpreted according to the claims described later, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of this document.

Description of Reference Numerals

[0062] 1, 2: Power storage system 10: Battery information management system 101, 102, 103, 104, 201, 202, 203, 204: Battery rack 111, 112, 113, 114, 211, 212, 213, 214: RBMS 121, 122, 123, 124: Communication device 130: Switch 140, 240: Controller 150, 250: Storage device M1, M2, M3, M4: Battery module S1, S2, S3, S4: MBMS C11~C15, C21~C25, C31~C35, C41~C45: Battery cell

Claims

1. A communication device that receives information about the battery rack from an RBMS (Rack Battery Management System) that controls the battery rack, A switch connected to the communication device via a local area network and receiving information about the battery rack from the communication device, A controller that receives information about the battery rack from the switch, A battery information management system comprising the above.

2. The battery rack includes at least one battery module, Each of the battery modules includes at least one battery cell, The battery information management system according to claim 1, wherein the information about the battery rack includes information about each of the battery cells.

3. Each of the battery modules is controlled by an MBMS (Module Battery Management System), The battery information management system according to claim 2, wherein the RBMS and the MBMS perform CAN (Controller Area Network) communication to transmit and receive information about each of the battery cells.

4. The battery information management system according to claim 3, wherein the communication device changes CAN communication data between the RBMS and the MBMS into TCP / IP packets and transmits them to the switch.

5. The communication device is assigned an IP in the DHCP (Dynamic Host Configuration Protocol) method and communicates with the switch based on the assigned IP, The battery information management system according to claim 4, wherein the switch is configured to enable IP assignment by the DHCP method.

6. The battery information management system according to claim 2, wherein the controller is configured to store information about each of the battery cells in a storage device.

7. The battery information management system according to claim 6, wherein the period for the controller to store information about each of the battery cells is within 1 second.

8. The battery information management system according to claim 6, wherein the controller is configured to determine the presence or absence of abnormalities in the battery cells based on the information about each of the battery cells stored in the storage device.

9. At least one battery rack, At least one RBMS (Rack Battery Management System) for controlling each of the at least one battery rack, A battery information management system for managing information regarding the at least one battery rack, comprising: The battery information management system includes: At least one communication device that receives information regarding the battery rack controlled by each RBMS from each of the RBMSs, A switch connected to the at least one communication device via a local area network and receiving information regarding the battery rack from the communication device, A controller that receives information regarding the battery rack from the switch, A power storage system including the above.

10. Each of the battery racks includes at least one battery module, Each of the battery modules includes at least one battery cell, The power storage system according to claim 9, wherein the information regarding the battery rack includes information regarding each of the battery cells.

11. Further comprising at least one MBMS (Module Battery Management System) for controlling each of the at least one battery module, The power storage system according to claim 10, wherein the RBMS and the MBMS perform CAN (Controller Area Network) communication to transmit and receive information regarding each of the battery cells.

12. The power storage system according to claim 11, wherein the communication device changes CAN communication data between the RBMS and the MBMS into TCP / IP packets and transmits the packets to the switch.

13. The communication device is assigned an IP in the DHCP (Dynamic Host Configuration Protocol) manner and communicates with the switch based on the assigned IP, The power storage system according to claim 12, wherein the switch is configured to enable IP assignment by the DHCP method.

14. Further comprising a storage device for storing information regarding each of the battery cells, The power storage system according to claim 10, wherein the controller is configured to store information regarding each of the battery cells in the storage device.

15. The power storage system according to claim 14, wherein a period in which the controller stores information regarding each of the battery cells is within 1 second.

16. The power storage system according to claim 14, wherein the controller is configured to determine the presence or absence of an abnormality in a battery cell based on information regarding each of the battery cells stored in the storage device when an abnormality occurs in the power storage system.

17. A step of a communication device receiving information regarding the battery rack from an RBMS (Rack Battery Management System) that controls the battery rack; A step of a switch connected to the communication device via a local area network receiving the information regarding the battery rack from the communication device; A step of a controller receiving the information regarding the battery rack from the switch; A battery information management method including the above.

18. The battery rack includes at least one battery module, each of the battery modules includes at least one battery cell, The battery information management method according to claim 17, wherein the information regarding the battery rack includes information regarding each of the battery cells.

19. The battery information management method according to claim 18, further including a step of the controller storing information regarding each of the battery cells in a storage device.

20. The battery information management method according to claim 19, further including a step of the controller determining the presence or absence of an abnormality in a battery cell based on information regarding each of the battery cells stored in the storage device.

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