Energy Storage Systems

Abstract

To provide an energy storage system allowing integrated control management and having an expandable structure.SOLUTION: An energy storage system includes: a control container configured to be connected to an external power conversion system (PCS) and an external electrical system; and a battery container including at least one battery rack and configured to be connected to the control container.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This application claims priority based on Korean Patent Application No. 10-2022-0008140, filed on January 19, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof.

[0002] The present invention relates to energy storage systems. [Background technology]

[0003] In recent years, as demand for portable electronic products such as laptops, video cameras, and mobile phones has grown rapidly and the development of electric vehicles, energy storage batteries, robots, and satellites has gained momentum, active research has been conducted into high-performance batteries that can be repeatedly charged and discharged.

[0004] Currently, commercially available batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium batteries. Among these, lithium batteries are attracting attention due to their advantages of being able to be freely charged and discharged since they have almost no memory effect compared to nickel-based batteries, as well as their extremely low self-discharge rate and high energy density.

[0005] An energy storage system using such a battery can be a device that stores a large amount of power and provides the stored power to multiple load facilities. For example, energy storage systems are used in forms such as energy management systems for industries, buildings, or households, and are used as a continuous power grid and / or an emergency power grid by providing stored power from each user to the load facilities.

[0006] Conventional energy storage systems are composed of containers, each of which contains multiple battery racks, power distribution panels, etc. This means that a container large enough to contain all of the components of the energy storage system is required.

[0007] Furthermore, when multiple energy storage systems are deployed, each energy storage system is composed of an independent container, which poses a problem that each container-based energy storage system must be controlled separately. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been devised to solve the above problems, and aims to provide an energy storage system that is capable of integrated control and management and has an expandable structure.

[0009] Other objects and advantages of the present invention will become apparent from the following description and the embodiments of the present invention, and can be realized by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0010] An energy storage system according to one aspect of the present invention may be an energy storage system including a control container configured to be connected to an external power conversion system (PCS) and an external electrical system, and a battery container including one or more battery racks and configured to be connected to the control container.

[0011] The control container may include a DC unit configured to receive DC power from the power conversion system (PCS) via a DC line, an AC unit configured to receive AC power from the electrical system via an AC line, and a main control unit connected to the AC unit, receiving power from the electrical system via the AC line, and communicatively connected to the power conversion system (PCS).

[0012] The DC unit may further include a main switch having one end connected to the power conversion system (PCS) and configured to be located in a DC line between the control container and the battery container, and a fuse connected to the other end of the main switch and configured to be located in the DC line.

[0013] The DC section may include a number of fuses corresponding to the number of containers of the battery.

[0014] The fuse may be configured to be detachable from the DC section.

[0015] The DC section may further include an insulation measurement unit connected to the DC line and configured to measure the insulation resistance of the DC line, and a surge protection unit connected to the DC line and configured to prevent surge current from flowing in the DC line.

[0016] The AC unit may include a first switch configured to have one end connected to the electrical system, an uninterruptible power supply unit configured to have one end connected to the other end of the first switch, a second switch configured to have one end connected to the other end of the uninterruptible power supply unit, and a third switch configured to have one end connected between the electrical system and one end of the first switch and the other end connected to the other end of the second switch.

[0017] The battery container may be configured to be directly connected to the AC unit via the AC line and connected in parallel to the DC line.

[0018] The main control unit may include a battery system controller (BSC), a master controller communicatively connected to the battery system controller (BSC) via a first communication line, and a bank battery management system (BBMS) communicatively connected to the battery system controller (BSC) via a second communication line.

[0019] The battery container may include one or more battery racks connected to the DC unit and configured to receive the DC power supply via the DC line, and a sub-control unit connected to the AC unit and receiving the power supply from the electrical system via the AC line, and connected so as to be able to communicate with the main control unit via the first communication line and the second communication line.

[0020] The sub-control unit may include a slave controller connected to be able to communicate with the master controller via the first communication line, and a rack battery management system (RBMS) configured to monitor information of the corresponding battery rack and connected to be able to communicate with the bank battery management system (BBMS) via the second communication line.

[0021] When a plurality of the battery containers are deployed, the master controller may be configured to be directly connected to each of a plurality of slave controllers included in the plurality of battery containers via the first communication line.

[0022] When the battery container is multiple, the bank battery management system (BBMS) may be configured to be connected in series with multiple rack battery management systems (RBMS) included in the multiple battery containers in a daisy chain manner via the second communication line.

[0023] The battery rack may further include a water injection container connected to the AC unit to receive power from the electrical system via the AC line, connected to the master controller via a third communication line, and connected to each of the battery racks via a pipeline.

[0024] The water injection container may be configured to release the fire extinguishing liquid therein into the pipeline upon receiving a water injection command from the master controller.

[0025] The battery container may include a sub-switch configured to have one end connected to the DC line and the other end connected to the one or more battery racks. [Effects of the Invention]

[0026] According to one aspect of the present invention, it is possible to provide an energy storage system that allows easy integration management and expansion of battery containers.

[0027] The effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0028] The following drawings attached to this specification are intended to facilitate a further understanding of the technical concepts of the present invention together with the detailed description of the invention to be given later, and therefore the present invention should not be interpreted as being limited to the matters depicted in the drawings. [Brief explanation of the drawings]

[0029] [Figure 1]FIG. 1 is a diagram illustrating a schematic of an energy storage system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating an exemplary configuration of a control container according to an embodiment of the present invention. [Figure 3] 1 is a diagram illustrating an exemplary configuration of a control container and a battery container according to one embodiment of the present invention. [Figure 4] 10A-10C are schematic diagrams illustrating other exemplary configurations of a control container and a battery container according to one embodiment of the present invention. [Figure 5] FIG. 1 is a diagram illustrating a schematic diagram of an exemplary configuration of an energy storage system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted in a way that corresponds to the technical idea of ​​the present invention, in accordance with the principle that the inventor himself can appropriately define the concept of the terms in order to best explain the invention.

[0031] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0032] Furthermore, in describing the present invention, if it is recognized that a specific description of known techniques related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0033] Phrases including ordinal numbers such as first and second are used to distinguish one of various components from the other components, and do not limit the components.

[0034] Throughout this specification, when a part is said to "comprise" a certain element, this does not mean that it may further include other elements, unless otherwise specified.

[0035] Incidentally, throughout this specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" via another element in between.

[0036] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 is a schematic diagram of an energy storage system 10 according to one embodiment of the present invention. Figure 2 is a schematic diagram of an exemplary configuration of a control container 100 according to one embodiment of the present invention.

[0038] An energy storage system 10 according to one embodiment of the present invention may include a control container 100 configured to be connected to an external PCS 20 (Power conversion system) and an external electrical system 30, and a battery container 200 including one or more battery racks 210 and configured to be connected to the control container 100.

[0039] For example, the energy storage system 10 may be written as DC-LINK, the control container 100 may be written as E-LINK, and the battery container 200 may be written as B-LINK.

[0040] Referring to FIG. 1, a control container 100 may include a DC unit 110, an AC unit 120, and a main control unit .

[0041] The DC section 110 may be configured to receive DC power from the PCS 20 via a DC line DCL.

[0042] Specifically, the DC unit 110 may be electrically connected to the PCS 20 via a DC line DCL. The DC unit 110 may receive DC power from the PCS 20 via the DC line DCL. For example, the PCS 20 may convert AC current flowing from the electrical system 30 into DC current and output the converted DC current to the DC unit 110 as DC power.

[0043] For example, in the embodiment of FIG. 2, the DC section 110 may be electrically connected to the PCS 20 via a DC line DCL.

[0044] The AC section 120 may be configured to receive AC power from the electrical system 30 via an AC line ACL.

[0045] Specifically, the AC unit 120 may be electrically connected to the electrical system 30 via an AC line ACL. The AC unit 120 may receive AC power from the electrical system 30 via the AC line ACL. For example, the AC power may be supplied to components contained in the control container 100, such as heating, ventilation, and air conditioning (HAVC), lighting, and a fire suppression system (FSS).

[0046] The main control unit 130 may be configured to be connected to the AC unit 120 and receive power from the electrical system 30 via the AC line ACL. The main control unit 130 may also be connected to the PCS 20 so as to be able to communicate with it.

[0047] Specifically, the main control unit 130 can monitor and control the status of the control container 100 and the battery container 200. The main control unit 130 is connected to the AC line ACL and can receive AC power from the electrical system 30. That is, since the control container 100 does not have a separate power supply device, the main control unit 130 can receive AC power from the AC unit 120.

[0048] Preferably, the main control unit 130 may include a power supply unit 134. Here, the power supply unit 134 may be an SMPS, which is a unit that converts alternating current (AC) into direct current (DC). The power supply unit 134 may be directly connected to the AC unit 120 via an AC line ACL. For example, in the embodiment of FIG. 2, the power supply unit 134 may be connected to the AC line ACL and convert AC power into DC power. Then, the power supply unit 134 may supply the converted DC power to the master controller 132 and the BBMS 133.

[0049] 2, the main control unit 130 may be connected to the AC unit 120 via an AC line ACL, and may receive AC power from the electrical system 30 via the AC line ACL.

[0050] An energy storage system 10 according to one embodiment of the present invention may include a control container 100 and a battery container 200, respectively.

[0051] Therefore, since the control container 100 and the battery container 200 are independent, the energy storage system 10 has the advantage of being easy to install. For example, the energy storage system 10 can be configured by simply connecting the communication lines and power lines between the control container 100 and the battery container 200, which reduces spatial constraints on the energy storage system 10.

[0052] Furthermore, the energy storage system 10 has an advantage in that the battery container 200 can be easily expanded. That is, since multiple battery containers 200 can be easily connected to one control container 100, the capacity of the energy storage system 10 can be easily expanded.

[0053] Referring to FIG. 2, the DC section 110 may include a main switch 111 and a fuse 112 .

[0054] The main switch 111 may be configured to have one end connected to the PCS 20 and to be located on the DC line DCL between the control container 100 and the battery container 200.

[0055] Specifically, the main switch 111 may be located on the DC line DCL, and one end of the main switch 111 may be connected to the PCS 20.

[0056] For example, in the embodiment of FIG. 2, the main switch 111 is located on the DC line DCL, and one end of the main switch 111 may be connected to the PCS 20.

[0057] The fuse 112 may be configured to be connected to the other end of the main switch 111 and located in the DC line DCL.

[0058] Specifically, the fuse 112 may be located on the DC line DCL, and one end of the fuse 112 may be connected to the other end of the main switch 111. That is, the PCS 20, the main switch 111, and the fuse 112 may be connected in series on the DC line DCL.

[0059] For example, in the embodiment of FIG. 2, the fuse 112 may be located in the DC line DCL, and one end of the fuse 112 may be connected to the other end of the main switch 111.

[0060] Meanwhile, fuses 112 may be included in the DC section 110 in a number corresponding to the number of battery containers.

[0061] For example, a fuse 112 may be included in the DC unit 110 to interrupt a short-circuit current in the event of a short-circuit accident. However, because the capacity of the fuse 112 is preset, if a battery container 200 is further connected to the control container 100, the pre-installed fuse 112 alone may not be able to interrupt the short-circuit current in the energy storage system 10.

[0062] Therefore, in order to effectively interrupt the short-circuit current, the number of fuses 112 may be included in the DC section 110 corresponding to the number of battery containers 200. For this purpose, the fuses 112 may be configured to be detachable in the DC section 110. That is, the fuses 112 may be configured to be detachable in the DC section 110 so that the number of fuses 112 included in the DC section 110 corresponds to the number of battery containers 200 connected to the control container 100.

[0063] When the DC section 110 includes multiple fuses 112, the multiple fuses 112 may be connected in parallel. That is, by connecting multiple fuses 112 in parallel, the amount of short-circuit current that can be interrupted can be increased.

[0064] Referring to FIG. 2, the DC section 110 may further include an insulation measurement unit 113 and a surge protection unit 114 .

[0065] The insulation measurement unit 113 may be connected to the DC line DCL and configured to measure the insulation resistance of the DC line DCL, and the surge protection unit 114 may be connected to the DC line DCL and configured to prevent a surge current from flowing through the DC line DCL.

[0066] For example, in the embodiment of FIG. 2, an insulation measurement unit 113 and a surge protection unit 114 may be connected to the DC line DCL between the PCS 20 and the main switch 111.

[0067] The insulation measurement unit 113 may monitor the DC line DCL for a ground fault and detect the insulation resistance of the battery rack 210 included in the battery container 200. For example, the insulation measurement unit 113 may be an insulation monitoring device (IMD).

[0068] The surge protection unit 114 can protect the control container 100 and the battery container 200 from surge currents caused by lightning strikes. For example, the surge protection unit 114 can be a surge protection device (SPD).

[0069] Referring to FIG. 2, the AC unit 120 may include a first switch 121, an uninterruptible power supply unit 122, a second switch 123, and a third switch 124.

[0070] The first switch 121 may be configured to have one end connected to the electrical system 30 .

[0071] 2, the first switch 121 may be located on the AC line ACL, and one end of the first switch 121 may be connected to the electrical system 30.

[0072] The uninterruptible power supply unit 122 may be configured to have one end connected to the other end of the first switch 121 .

[0073] Specifically, the uninterruptible power supply unit 122 may be an uninterruptible power supply system (UPS).

[0074] 2, the uninterruptible power supply unit 122 may be located on the AC line ACL. One end of the uninterruptible power supply unit 122 may be connected to the other end of the first switch 121.

[0075] The second switch 123 may be configured to have one end connected to the other end of the uninterruptible power supply unit 122 .

[0076] 2, the second switch 123 may be located on the AC line ACL, and one end of the second switch 123 may be connected to the other end of the uninterruptible power supply unit 122. That is, the first switch 121, the uninterruptible power supply unit 122, and the second switch 123 may be connected in series on the AC line ACL.

[0077] The third switch 124 may be configured such that one end is connected between the electrical system 30 and one end of the first switch 121 and the other end is connected to the other end of the second switch 123.

[0078] 2, the third switch 124 may be connected in parallel with the first switch 121, the uninterruptible power supply unit 122, and the second switch 123. Specifically, one end of the third switch 124 may be connected to the AC line ACL between the electric system 30 and one end of the first switch 121. The other end of the third switch 124 may be connected to the AC line ACL connected to the other end of the second switch 123.

[0079] The main control unit 130 may include a BSC 131 (Battery system controller), a master controller 132, and a BBMS 133 (Bank battery management system).

[0080] The BSC 131 is a top-level controller and can be communicatively connected to the master controller 132 and the BBMS 133 .

[0081] The BSC 131 may be configured to be connected to the PCS 20 via a first communication line CL1. For example, the first communication line CL1 may be a communication line that applies to a first communication protocol. As a specific example, the first communication line CL1 may be a communication line for Modbus TCP / IP communication.

[0082] The master controller 132 may be communicatively connected to the BSC 131 via a first communication line CL1.

[0083] Here, the master controller 132 is a programmable logic controller (PLC) included in E-LINK and can be abbreviated as E-PLC. That is, the master controller 132 is connected to and controls components included in the control container 100, such as the HVAC, uninterruptible power supply unit 122, door sensor, fuse 112, switch, SMPS, FSS, surge protection unit 114, and insulation measurement unit 113. The master controller 132 can transmit information about the control container 100 acquired from these components to the BSC 131 via the first communication line CL1. That is, the BSC 131 can receive the information about the control container 100 acquired by the master controller 132 via the first communication line CL1. The BSC 131 can then control the master controller 132 to control each component included in the control container 100 based on the information about the control container 100.

[0084] 2, the master controller 132 may be communicatively coupled to the BSC 131 via a first communication line CL1. That is, the PCS 20, the BSC 131, and the master controller 132 may be coupled to each other via the first communication line CL1.

[0085] The BBMS 133 may be communicatively coupled to the BSC 131 via a second communication line CL2.

[0086] For example, the second communication line CL2 may be a communication line that is applied to a second communication protocol. Specifically, the second communication line CL2 may be a communication line for controller area network (CAN) communication.

[0087] For example, in the embodiment of Figure 2, the BBMS 133 may be communicatively connected to the BSC 131 via a second communication line CL2. That is, the BSC 131 may be connected to the master controller 132 and the BBMS 133 via different communication lines. Thus, if a failure occurs in one of the communication lines, the BSC 131 can continue to communicate via the remaining communication lines.

[0088] FIG. 3 is a schematic diagram illustrating an exemplary configuration of a control container 100 and a battery container 200 according to one embodiment of the present invention.

[0089] The battery container 200 may include one or more battery racks 210 and a sub-control unit 220.

[0090] One or more battery racks 210 may be configured to be connected to the DC unit 110 and receive DC power via a DC line DCL.

[0091] Specifically, the battery container 200 may include one or more battery racks 210. Each battery rack 210 may include one or more battery modules. Each battery rack 210 may be connected to a DC line DCL. That is, each battery module included in each battery rack 210 may receive DC power via the DC line DCL. For example, during a charging process of the battery rack 210, each battery module included in the battery rack 210 may receive DC power via the DC line DCL.

[0092] For example, in the embodiment of Fig. 3, the battery rack 210 may be connected in parallel to the DC line DCL. A fuse 112 is connected to the DC line DCL, making it possible to interrupt a short-circuit current. Furthermore, the insulation measurement unit 113 diagnoses ground faults and insulation of the DC line DCL, and the surge protection unit 114 can prevent surge currents from flowing. Therefore, the DC unit 110 can safely protect the battery modules included in the battery rack 210.

[0093] The sub-control unit 220 is connected to the AC unit 120 and receives power from the electrical system 30 via the AC line ACL, and can be connected so as to be able to communicate with the main control unit 130 via a first communication line CL1 and a second communication line CL2.

[0094] Specifically, the sub-controller 220 may monitor and control the state of the battery container 200. The sub-controller 220 may be connected to the AC line ACL and may receive AC power from the electrical system 30. That is, since the battery container 200 does not have a separate power supply device, the sub-controller 220 may receive AC power from the AC unit 120.

[0095] 3, the sub-controller 220 may be connected to the AC unit 120 via an AC line ACL. The sub-controller 220 may receive AC power from the electrical system 30 via the AC line ACL. Here, the main controller 130 and the sub-controller 220 may be connected in parallel to the AC unit 120.

[0096] In the embodiment of FIG. 3, the sub-control unit 220 can be communicably connected to the main control unit 130 via a first communication line CL1 and a second communication line CL2.

[0097] That is, the control container 100 and the battery container 200 are electrically connected via a DC line DCL and an AC line ACL, and can be connected so as to be able to communicate with each other via a first communication line CL1 and a second communication line CL2.

[0098] Therefore, the battery container 200 of the energy storage system 10 can be easily expanded. That is, a plurality of battery containers 200 can be connected to the control container 100 based on connections to the DC line DCL, the AC line ACL, the first communication line CL1, and the second communication line CL2. Therefore, according to one embodiment of the present invention, there is an advantage that the capacity of the energy storage system 10 can be easily expanded.

[0099] The sub-control unit 220 may include a slave controller 221 and a rack battery management system (RBMS) 222.

[0100] The slave controller 221 may be communicatively connected to the master controller 132 via a first communication line CL1.

[0101] Here, the slave controller 221 is a PLC included in B-LINK and may be abbreviated as B-PLC. That is, the slave controller 221 may be connected to the HVAC, uninterruptible power supply unit 122, door sensor, gas sensor, smoke sensor, switch, SMPS, damper, fan, FAN, FSS, etc. included in the battery container 200 and control these components. The slave controller 221 may transmit information about the battery container 200 acquired from these components to the master controller 132 via the first communication line CL1. The BSC 131 may receive the information about the battery container 200 acquired by the master controller 132 via the first communication line CL1. That is, the BSC 131, the master controller 132, and the slave controller 221 may be connected to each other via the first communication line CL1. The BSC 131 may control the slave controller 221 to control each component included in the battery container 200 based on the information about the battery container 200.

[0102] 3, the slave controller 221 may be communicatively connected to the master controller 132 via a first communication line CL1. That is, the BSC 131, the master controller 132, and the slave controller 221 may be connected to each other via the first communication line CL1.

[0103] The RBMS 222 is configured to monitor information of the corresponding battery rack 210 and may be communicatively connected to the BBMS 133 via a second communication line CL2.

[0104] Specifically, the battery container 200 may include one or more battery racks 210. Each battery rack 210 may include one or more battery modules. The status of these battery modules may be monitored by a module battery management system (MBMS). One or more MBMSs may be connected to a corresponding RBMS 222 via a second communication line CL2. That is, the RBMS 222 may monitor the status of the battery rack 210 and the status of the battery modules included in the battery rack 210.

[0105] The RBMS 222 may be connected to the BBMS 133. That is, the BBMS 133 included in the control container 100 may be connected to the RBMS 222 included in the battery container 200 using the second communication line CL2. The BBMS 133 may receive information about the corresponding battery rack 210 from one or more RBMSs 222 included in the battery container 200.

[0106] 2, the battery container 200 may include two RBMSs 222. The RBMSs 222 may be connected to the BBMS 133 via a second communication line CL2. The RBMSs 222 may then be connected to the RBMS 222 via a second communication line CL2. That is, the BSC 131 and the BBMS 133 included in the control container 100 may be communicatively connected to the RBMS 222 included in the battery container 200 via the second communication line CL2.

[0107] An energy storage system 10 according to an embodiment of the present invention may include a first communication line CL1 connecting the BSC 131, the master controller 132, and the slave controller 221, and a second communication line CL2 connecting the BSC 131, the BBMS 133, and the RBMS 222. Therefore, even if a failure occurs in any one of the communication lines, communication can continue via the remaining communication lines.

[0108] For example, even if a failure occurs in the first communication line CL1 and communication between the master controller 132 and the slave controller 221 does not proceed normally, the BBMS 133 can normally receive information about the battery rack 210 from the RBMS 222 via the second communication line CL2. Therefore, the energy storage system 10 has the advantage of being able to establish independent communication paths via different communication lines in consideration of the communication target and purpose. Therefore, stable communication can be performed in the energy storage system 10.

[0109] Additionally, the battery container 200 may further include a sub-switch 230.

[0110] Specifically, the sub-switch 230 may be configured such that one end is connected to the DC line DCL and the other end is connected to one or more battery racks 210.

[0111] The slave controller 221 may be configured to control the operation state of the sub-switch 230. Specifically, the slave controller 221 may control the operation state of the sub-switch 230 to a turn-off state as necessary to cut off the connection between the DC line DCL and the battery rack 210. For example, if the door of the battery container 200 is open or if a fire breaks out in the battery container 200, the slave controller 221 may control the operation state of the sub-switch 230 to a turn-off state.

[0112] For example, when the electrical connection between the DC line DCL and all the battery containers 200 needs to be cut off, the master controller 132 may control the operation state of the main switch 111 to a turned-off state. Then, the slave controller 221 may control the operation state of the sub-switch 230 to a turned-off state. In this case, the operation states of both the main switch 111 and the sub-switch 230 are controlled to a turned-off state, so that the electrical connection between the DC line DCL and the battery rack 210 can be completely cut off.

[0113] For another example, when the connection between the DC line DCL and the target battery container 200 needs to be cut off, the master controller 132 may control the operation state of the main switch 111 to a turned-on state. Then, the slave controller 221 included in the target battery container 200 may control the operation state of the corresponding sub-switch 230 to a turned-off state. In this case, DC power may be supplied to the remaining battery containers 200 except for the target battery container 200.

[0114] The energy storage system 10 according to an embodiment of the present invention has an advantage in that the electrical connection between the battery containers 200 and the DC line DCL can be controlled via the main switch 111 and the sub-switch 230. In particular, since the electrical connection between each of the battery containers 200 and the DC line DCL can be controlled, there is an advantage in that maintenance and expansion of the battery containers 200 can be easily performed.

[0115] FIG. 4 is a schematic diagram illustrating another exemplary configuration of a control container 100 and a battery container 200 according to an embodiment of the present invention.

[0116] The battery container 200 may be configured to be directly connected to the AC unit 120 via an AC line ACL and connected in parallel to a DC line DCL.

[0117] The sub-controller 220 of the battery container 200 may include a power supply unit 223. Here, the power supply unit 223 may be an SMPS. The power supply unit 223 may be directly connected to the AC unit 120 via an AC line ACL. For example, in the embodiment of FIG. 4 , the plurality of battery containers 200 may be directly connected to the AC unit 120 via the AC line ACL. The power supply unit 223 may convert AC power into DC power and supply the converted DC power to the slave controller 221 and the RBMS 222.

[0118] One end of the sub-switch 230 of the battery container 200 may be connected to the DC line DCL, and the other end of the sub-switch 230 may be connected to the battery rack 210. That is, multiple battery containers 200 may be connected in parallel to the DC line DCL. For example, in the embodiment of FIG. 4, multiple battery containers 200 may be connected in parallel to the DC line DCL via the sub-switch 230.

[0119] When multiple battery containers 200 are deployed, the master controller 132 may be configured to be directly connected to each of the multiple slave controllers 221 included in the multiple battery containers 200 via the first communication line CL1.

[0120] Specifically, the master controller 132 may be configured to be directly connected to each of the plurality of slave controllers 221 via the first communication line CL1. For example, the master controller 132 may be configured to be directly connected to each of the plurality of slave controllers 221 via the first communication line CL1 in a home run manner.

[0121] 4, the master controller 132 may be directly connected to the slave controller 221 included in the battery container 200 via a first communication line CL1. The master controller 132 may be directly connected to the slave controller 221 included in the battery container 200 via a first communication line CL1. That is, the communication structure between the master controller 132 and the slave controller 221 may not affect the communication structure between the master controller 132 and the slave controller 221.

[0122] In the case where there are multiple battery containers 200, the BBMS 133 may be configured to be connected to multiple RBMSs 222 included in the multiple battery containers 200 via the second communication line CL2.

[0123] Specifically, the BBMS 133 may be configured to be connected in series with a plurality of RBMSs 222 via the second communication line CL2. The BBMS 133 may be configured to be connected in series with a plurality of RBMSs 222 via the second communication line CL2 in a daisy chain manner.

[0124] For example, in the embodiment of FIG. 4, the BSC 131, the BBMS 133, and the RBMS 222 may be connected in a daisy chain manner via the second communication line CL2.

[0125] The energy storage system 10 according to one embodiment of the present invention has the advantage of providing independence between the communication path along the first communication line CL1 and the communication path along the second communication line CL2, thereby improving the stability of each communication path.

[0126] FIG. 5 is a diagram illustrating a schematic of an exemplary configuration of an energy storage system 10 according to one embodiment of the present invention.

[0127] Referring to FIG. 5, the energy storage system 10 may further include a water injection container 300.

[0128] Specifically, the water injection container 300 may include a water injection device that can inject a fire-extinguishing liquid into the battery container 200 when a fire occurs in the battery container 200. The water injection container 300 may be referred to as a water injection unit (WIU).

[0129] The water injection container 300 may be configured to be connected to the AC unit 120 and receive power from the electrical system 30 via the AC line ACL.

[0130] For example, in the embodiment of Fig. 3, the water filling container 300 may be electrically connected to the AC unit 120 via the AC line ACL, and may receive AC power via the AC line ACL.

[0131] The water injection container 300 may be configured to be connected to the master controller 132 via a third communication line CL3.

[0132] For example, the water injection container 300 may include a control unit and a water injection unit. When the control unit receives a water injection command from the master controller 132, it may control the water injection unit to dispense fire-extinguishing fluid.

[0133] The water injection container 300 may be configured to be connected to each of the battery racks 210 via the pipeline PL. The water injection container 300 may be configured to inject the fire extinguishing liquid therein into the pipeline PL upon receiving a water injection command from the master controller 132.

[0134] Furthermore, the water injection unit may be connected to the RBMS 222 included in the battery container 200 via a pipeline PL. Specifically, the water injection unit may be connected to each battery module included in the RBMS 222 via the pipeline PL. Here, a breakable valve may be provided in the pipeline PL. For example, the valve may be configured to be breakable depending on the temperature of the connected battery rack 210 or battery module.

[0135] For example, if a fire breaks out in the battery container 200, the control unit may receive a water injection command. The control unit may control the water injection unit to inject fire extinguishing liquid into the pipeline PL. In this case, the pipeline PL corresponding to the battery module where the fire broke out should have a broken valve, allowing the fire extinguishing liquid to flow into the battery module through the pipeline PL.

[0136] 5, the master controller 132 may be communicatively connected to the water injection container 300 via a third communication line CL3. For example, the third communication line CL3 may be a communication line that conforms to a third communication protocol. Specifically, the third communication line CL3 may be a communication line for Modbus RTU communication.

[0137] The energy storage system 10 according to one embodiment of the present invention has the advantage of being able to ensure communication stability for each communication path by constructing independent communication paths using the first communication line CL1, the second communication line CL2, and the third communication line CL3.

[0138] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited to these, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the scope of equivalents of the claims.

[0139] Furthermore, the present invention described above is susceptible to various substitutions, modifications, and alterations by a person having ordinary knowledge in the technical field to which the present invention pertains, within the scope of the technical concept of the present invention. Therefore, the present invention is not limited to the above-described embodiments and the accompanying drawings, and may be configured by selectively combining all or part of each embodiment for various modifications. [Explanation of symbols]

[0140] 10 Energy Storage Systems 20 PCS 30 Electrical System 100 Control Container 110 DC section 111 Main switch 112 Fuse 113 Insulation measurement unit 114 Surge Protection Unit 120 AC Section 121 First Switch 122 Uninterruptible Power Supply Unit 123 Second Switch 124 The Third Switch 130 Main control unit 131 BSC 132 Master Controller 133 BBMS 134 Power Supply Unit 200 Battery Container 210 Battery Rack 220 Sub-controller 221 Slave Controller 222RBMS 223 Power Supply Unit 230 Sub Switch 300 Water Container

Claims

1. 1. An energy storage system including: a control container configured to be connected to at least one power conversion system (PCS) and an external electrical system; and a battery container including one or more battery racks and configured to be connected to the control container, The control container a DC unit configured to be connected to the power conversion system (PCS) connected to the electrical system via a DC line; an AC unit connected to the electrical system via an AC line and configured to receive AC power; a main control unit configured to receive power supply via the AC line and to be communicably connected to the power conversion system (PCS); an energy storage system,

2. The power conversion system (PCS) The energy storage system of claim 1 configured to be contained within at least one of the control container and the battery container.

3. The DC section is 10. The energy storage system of claim 1, further comprising a main switch and a fuse configured to be connected in series with the DC line.

4. The fuse is The energy storage system of claim 3 , wherein the DC section includes a number of battery containers corresponding to the number of battery containers.

5. The fuse is The energy storage system according to claim 4 , configured to be detachable from the DC unit.

6. The DC section is an insulation measurement unit connected to the DC line and configured to measure the insulation resistance of the DC line; a surge protection unit connected to the DC line and configured to prevent surge currents from flowing in the DC line; 4. The energy storage system of claim 3, further comprising:

7. The AC unit is a first switch, an uninterruptible power supply unit, and a second switch connected in series to the AC line; a third switch connected in parallel to the first switch and the second switch; 10. The energy storage system of claim 1, comprising:

8. The battery container The energy storage system of claim 1 configured to be directly coupled to the AC section via the AC line and connected in parallel to the DC line.

9. The main control unit a battery system controller (BSC); a master controller communicatively connected to the battery system controller (BSC) via a first communication line; a bank battery management system (BBMS) communicatively connected to the battery system controller (BSC) via a second communication line; 10. The energy storage system of claim 1, comprising:

10. The battery container one or more battery racks configured to be connected to the DC line; a sub-controller that receives the AC power supply via the AC line and is communicably connected to the main controller via the first communication line and the second communication line; 10. The energy storage system of claim 9, comprising:

11. The sub-control unit a slave controller communicatively connected to the master controller via the first communication line; a rack battery management system (RBMS) configured to monitor information of a corresponding battery rack and communicatively connected to the bank battery management system (BBMS) via the second communication line; 11. The energy storage system of claim 10, comprising:

12. The master controller 12. The energy storage system according to claim 11, wherein when a plurality of the battery containers are deployed, the battery containers are configured to be directly connected to each of a plurality of slave controllers included in the plurality of battery containers via the first communication line.

13. The bank battery management system (BBMS) 12. The energy storage system according to claim 11, wherein when there are a plurality of battery containers, the battery containers are configured to be connected in series to a plurality of rack battery management systems (RBMSs) included in the plurality of battery containers in a daisy chain manner via the second communication line.

14. The battery container 10. The energy storage system of claim 1, comprising a sub-switch configured to have one end connected to the DC line and another end connected to the one or more battery racks.

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