Energy storage system

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, and all the contents disclosed in the specification and drawings of the application are incorporated herein by reference.

[0002] The present invention relates to an energy storage system.

Background Art

[0003] In recent years, with the rapid growth in the demand for portable electronic products such as laptops, video cameras, mobile phones, etc., and the full-scale development of electric vehicles, energy storage batteries, robots, satellites, etc., research on high-performance rechargeable batteries has been actively conducted.

[0004] Currently, commercially available batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium batteries, etc. Among them, lithium batteries are in the spotlight because they have almost no memory effect compared to nickel-based batteries, enabling free charging and discharging, having a very low self-discharge rate, and a high energy density.

[0005] An energy storage system using such a battery can be a device that stores a large amount of electric power and provides the stored electric power to a plurality of load facilities. For example, the energy storage system is used in the form of an industrial, building, or household energy management system, and provides the stored electric power from each usage destination to the load facilities and is used as a normal power grid and / or an emergency power grid at all times.

[0006] Conventional energy storage systems are composed of containers, and each container includes a plurality of battery racks, switchboards, etc. That is, a container of a size that can include all the components of the energy storage system is required.

[0007] In addition, when multiple energy storage systems are deployed, since each energy storage system is composed of independent containers, there is a problem that the energy storage systems in container units must be controlled separately.

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been devised to solve the above problems, and an object thereof is to provide an energy storage system having an integrated control management function and an expandable structure.

[0009] Other objects and advantages of the present invention will be understood from the following description and will become more apparent from the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and combinations thereof shown in the claims.

Means for Solving the Problems

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

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

[0012] The DC section may further include a main switch with one end connected to the power conversion system (PCS) and configured to be located on the 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 on the DC line.

[0013] The number of fuses corresponding to the number of containers of the battery may be included in the DC section.

[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 a surge current from flowing through the DC line.

[0016] The AC section may include a first switch configured such that one end is connected to the electrical system, an uninterruptible power supply unit with one end connected to the other end of the first switch, a second switch with one end connected to the other end of the uninterruptible power supply unit, and a third switch with 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 directly connected to the AC section via the AC line and configured to be connected in parallel to the DC line.

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

[0019] The battery container may include one or more battery racks configured to be connected to the DC section and receive power supply from the DC power source via the DC line, and a sub-control unit connected to the AC section to receive power supply from the electrical system via the AC line and configured to be communicable 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 communicable 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 communicable with the bank battery management system (BBMS) via the second communication line.

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

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

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

[0024] The water injection container may be configured to discharge the internal fire extinguishing liquid to the pipeline when receiving a water injection command from the master controller.

[0025] The battery container may include a sub-switch configured such that one end is connected to the DC line and the other end is connected to the one or more battery racks.

Advantages of the Invention

[0026] According to one aspect of the present invention, it becomes possible to provide an energy storage system in which integrated management and expansion of battery containers are easy to perform.

[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 for the purpose of further understanding the technical idea of the present invention together with the detailed description of the invention to be described later. Therefore, the present invention is not construed as being limited only to the matters described in the drawings.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0030] The terms and words used in this specification and the claims are not to be construed as being limited to the ordinary or dictionary meanings. The inventors, in accordance with the principle that they can appropriately define the concept of the terms in order to explain the invention in the best way, are construed in meanings and concepts corresponding to the technical idea of the present invention.

[0031] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Thus, there can be various equivalents and modifications that can replace them at the time of this application.

[0032] Also, when explaining the present invention, if it is recognized that a detailed description of known technology related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0033] Expressions including ordinal numbers such as first and second are used to distinguish any one of various components from other elements, and the components are not limited by these expressions.

[0034] Throughout the specification, when a part "includes" a certain component, this means that, unless otherwise specified, it may further include other components rather than excluding other components.

[0035] Incidentally, throughout the specification, when a part is "connected" to another part, this includes not only the case where it is "directly connected", but also the case where it is "indirectly connected" with other elements interposed therebetween.

[0036] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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

[0038] An energy storage system 10 according to an 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 grid 30, and one or more battery racks 210, and a battery container 200 configured to be connected to the control container 100.

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

[0040] Referring to FIG. 1, the control container 100 may include a DC section 110, an AC section 120, and a main control section 130.

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

[0042] Specifically, the DC unit 110 can be electrically connected to the PCS 20 via the DC line DCL. And the DC unit 110 can receive the supply of the DC power from the PCS 20 via the DC line DCL. For example, the PCS 20 can convert the alternating current flowing in from the electrical system 30 into a direct current and output the converted direct current as a DC power source to the DC unit 110.

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

[0044] The AC unit 120 can be configured to receive the supply of the AC power from the electrical system 30 via the AC line ACL.

[0045] Specifically, the AC unit 120 can be electrically connected to the electrical system 30 via the AC line ACL. And the AC unit 120 can receive the supply of the AC power from the electrical system 30 via the AC line ACL. For example, the AC power source can be supplied to components such as the heating, ventilation and air conditioning (HAVC) equipment, lighting, and fire suppression system (FSS) included in the control container 100.

[0046] The main control unit 130 can be connected to the AC unit 120 and configured to receive the supply of the power from the electrical system 30 via the AC line ACL. Also, the main control unit 130 can be communicably connected to the PCS 20.

[0047] Specifically, the main control unit 130 can monitor and control the states of the control container 100 and the battery container 200. And the main control unit 130 is connected to the AC line ACL and can receive the supply of the AC power from the electrical system 30. That is, since there is no separate power supply device in the control container 100, the main control unit 130 can receive the supply of the 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 a 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 an AC power supply into a DC power supply. Then, the power supply unit 134 may supply the converted DC power supply to the master controller 132 and the BBMS 133.

[0049] For example, in the embodiment of FIG. 2, the main control unit 130 may be connected to the AC unit 120 via the AC line ACL. Then, the main control unit 130 may receive the supply of the AC power from the electrical system 30 via the AC line ACL.

[0050] The energy storage system 10 according to an 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, as long as the communication line and the power line between the control container 100 and the battery container 200 are connected, the energy storage system 10 can be configured, so that the spatial constraints of the energy storage system 10 can be reduced.

[0052] In addition, the energy storage system 10 has the advantage that the battery container 200 is easy to expand. That is, since it is possible to easily connect a plurality of battery containers 200 to one control container 100, the energy storage system 10 has the advantage that its capacity is easy to expand.

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

[0054] The main switch 111 may be configured such that one end thereof is connected to the PCS 20 and is 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 connected to the other end of the main switch 111 and may be configured to be located on 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 is 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.

[0060] On the other hand, the fuse 112 may be included in the DC unit 110 in a number corresponding to the number of battery containers.

[0061] For example, fuse 112 may be included in DC section 110 to cut off the short-circuit current when a short-circuit accident occurs. However, since the capacity of fuse 112 is preset, if battery container 200 is further connected to control container 100, there is a problem that the short-circuit current of energy storage system 10 cannot be cut off only by the pre-arranged fuse 112.

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

[0063] And when a plurality of fuses 112 are included in DC section 110, the plurality of fuses 112 may be connected in parallel. That is, by connecting the plurality of fuses 112 in parallel, it is possible to increase the amount of short-circuit current that can be cut off.

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

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

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

[0067] The insulation measurement unit 113 can monitor the ground fault of the DC line DCL and detect the insulation resistance of the battery rack 210 included in the battery container 200. For example, the insulation measurement unit 113 can 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 protect device (SPD).

[0069] Referring to FIG. 2, the AC section 120 can 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 can be configured such that one end thereof is connected to the electrical system 30.

[0071] For example, in the embodiment of FIG. 2, the first switch 121 can be located on the AC line ACL. And one end of the first switch 121 can be connected to the electrical system 30.

[0072] The uninterruptible power supply unit 122 can be configured such that one end thereof is connected to the other end of the first switch 121.

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

[0074] For example, in the embodiment of FIG. 2, the uninterruptible power supply unit 122 can be located on the AC line ACL. One end of the uninterruptible power supply unit 122 can be connected to the other end of the first switch 121.

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

[0076] For example, in the embodiment of FIG. 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 thereof is connected between the electrical system 30 and one end of the first switch 121, and the other end thereof is connected to the other end of the second switch 123.

[0078] For example, in the embodiment of FIG. 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 electrical system 30 and one end of the first switch 121. And 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 the highest-level controller and may be communicably connected to the master controller 132 and the BBMS 133.

[0081] In addition, 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 applicable to a first communication protocol. By way of 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 connected so as to be communicable with the BSC 131 via the first communication line CL1.

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

[0084] For example, in the embodiment of FIG. 2, the master controller 132 may be connected so as to be communicable with the BSC 131 via the first communication line CL1. That is, the PCS 20, the BSC 131, and the master controller 132 may be connected to each other via the first communication line CL1.

[0085] The BBMS 133 can be connected to be communicable with the BSC 131 via a second communication line CL2.

[0086] For example, the second communication line CL2 can be a communication line applied to a second communication protocol. To give a specific example, the second communication line CL2 can be a communication line for Controller Area Network (CAN) communication.

[0087] For example, in the embodiment of FIG. 2, the BBMS 133 can be connected to be communicable with the BSC 131 via the second communication line CL2. That is, the BSC 131 can be connected to the master controller 132 and the BBMS 133 via different communication lines. Therefore, even if a defect occurs in any one of the communication lines, the BSC 131 can continue to communicate via the remaining communication lines.

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

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

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

[0091] Specifically, the battery container 200 may include one or more battery racks 210. And each battery rack 210 may include one or more battery modules. And each battery rack 210 may be connected to the DC line DCL. That is, each battery module included in each battery rack 210 may receive the supply of DC power via the DC line DCL. For example, in the charging process of the battery rack 210, each battery module included in the battery rack 210 may receive the supply of 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. Since a fuse 112 is connected to such a DC line DCL, it is possible to cut off the short-circuit current. Also, the insulation measurement unit 113 diagnoses the ground fault and insulation of the DC line DCL, and the surge protection unit 114 can prevent the flow of surge current. Therefore, the battery module included in the battery rack 210 can be safely protected by the DC unit 110.

[0093] The sub-control unit 220 may be connected to the AC unit 120 to receive the supply of power from the electrical system 30 via the AC line ACL, and may be connected to be communicable with the main control unit 130 via the first communication line CL1 and the second communication line CL2.

[0094] Specifically, the sub-control unit 220 may monitor and control the state of the battery container 200. And the sub-control unit 220 is connected to the AC line ACL and may receive the supply of AC power from the electrical system 30. That is, since there is no separate power supply device in the battery container 200, the sub-control unit 220 may receive the supply of AC power from the AC unit 120.

[0095] For example, in the embodiment of FIG. 3, the sub-control unit 220 may be connected to the AC unit 120 via the AC line ACL. And the sub-control unit 220 may receive the supply of the AC power from the electrical system 30 via the AC line ACL. Here, the main control unit 130 and the sub-control unit 220 may be connected in parallel to the AC unit 120.

[0096] Also, in the embodiment of FIG. 3, the sub-control unit 220 may be connected so as to be communicable with the main control unit 130 via the first communication line CL1 and the second communication line CL2.

[0097] That is, the control container 100 and the battery container 200 may be electrically connected via the DC line DCL and the AC line ACL, and may be connected so as to be communicable via the first communication line CL1 and the second communication line CL2.

[0098] Therefore, in the energy storage system 10, the battery container 200 is easily expandable. That is, based on the connections to the DC line DCL, the AC line ACL, the first communication line CL1, and the second communication line CL2, a plurality of battery containers 200 can be connected to the control container 100. Therefore, according to an 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 an RBMS 222 (Rack battery management system).

[0100] The slave controller 221 may be connected so as to be communicable with the master controller 132 via the first communication line CL1.

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

[0102] For example, in the embodiment of FIG. 3, the slave controller 221 can be connected so as to be communicable with the master controller 132 via the first communication line CL1. That is, the BSC 131, the master controller 132, and the slave controller 221 can be connected to each other via the first communication line CL1.

[0103] The RBMS 222 is configured to monitor the information of the corresponding battery rack 210 and can be connected so as to be communicable with the BBMS 133 via the second communication line CL2.

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

[0105] And 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. And the BBMS 133 may receive information on the corresponding battery rack 210 from one or more RBMSs 222 included in the battery container 200.

[0106] For example, in the embodiment of FIG. 2, the battery container 200 may include two RBMSs 222. The RBMS 222 may be connected to the BBMS 133 via the second communication line CL2. And the RBMS 222 may be connected to the RBMS 222 via the second communication line CL2. That is, the BSC 131 and the BBMS 133 included in the control container 100 may be connected so as to be communicable with 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 BSC 131, a first communication line CL1 connecting a master controller 132 and a slave controller 221, and a second communication line CL2 connecting the BSC 131, a BBMS 133, and an RBMS 222, respectively. Therefore, even if a defect occurs in any one of the communication lines, communication can continue via the remaining communication lines.

[0108] For example, even if a problem occurs in the first communication line CL1 and communication between the master controller 132 and the slave controller 221 cannot be performed normally, the BBMS 133 can normally receive information on the battery rack 210 from the RBMS 222 via the second communication line CL2. Therefore, the energy storage system 10 has an advantage that independent communication paths can be constructed via different communication lines in consideration of the communication target and the communication purpose. Therefore, stable communication can be performed in the energy storage system 10.

[0109] 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 operating state of the sub-switch 230. Specifically, the slave controller 221 may control the operating state of the sub-switch 230 to the off state as needed to disconnect the connection between the DC line DCL and the battery rack 210. For example, when the door of the battery container 200 is open or a fire occurs in the battery container 200, the slave controller 221 may control the operating state of the sub-switch 230 to the off state.

[0112] For example, when it is necessary to cut off the electrical connection between the DC line DCL and all the battery containers 200, the master controller 132 can control the operating state of the main switch 111 to the off state. Then, the slave controller 221 can control the operating state of the sub-switch 230 to the off state. In this case, by controlling the operating states of both the main switch 111 and the sub-switch 230 to the off state, it becomes possible to perfectly cut off the electrical connection between the DC line DCL and the battery rack 210.

[0113] As another example, when it is necessary to cut off the connection between the DC line DCL and the target battery container 200, the master controller 132 can control the operating state of the main switch 111 to the on state. Then, the slave controller 221 included in the target battery container 200 can control the operating state of the corresponding sub-switch 230 to the off state. In this case, the remaining battery containers 200 except for the target battery container 200 can be supplied with DC power.

[0114] The energy storage system 10 according to an embodiment of the present invention has an advantage that it can control the electrical connection between the battery container 200 and the DC line DCL 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 that maintenance and expansion of the battery containers 200 can be easily performed.

[0115] FIG. 4 is a diagram schematically showing another exemplary configuration of the control container 100 and the 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 the AC line ACL and connected in parallel to the DC line DCL.

[0117] The sub-control unit 220 of the battery container 200 may include a power supply unit 223. Here, the power supply unit 223 may be a SMPS. The power supply unit 223 may be directly connected to the AC unit 120 via the AC line ACL. For example, in the embodiment of FIG. 4, a plurality of battery containers 200 may be directly connected to the AC unit 120 via the AC line ACL. Then, the power supply unit 223 may convert the 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, a plurality of battery containers 200 may be connected in parallel to the DC line DCL. For example, in the embodiment of FIG. 4, a plurality of battery containers 200 may be connected in parallel to the DC line DCL via the sub-switch 230.

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

[0121] For example, in the embodiment of FIG. 4, the master controller 132 may be directly connected to the slave controller 221 included in the battery container 200 via the first communication line CL1. And the master controller 132 may be directly connected to the slave controller 221 included in the battery container 200 via the 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] When there are a plurality of battery containers 200, the BBMS 133 may be configured to be connected to a plurality of RBMSs 222 included in the plurality of 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 each other in a daisy chain manner with a plurality of RBMSs 222 via the second communication line CL2.

[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 an embodiment of the present invention has an advantage that the stability of each communication path can be improved by providing independence to the communication path along the first communication line CL1 and the communication path along the second communication line CL2.

[0126] FIG. 5 is a diagram schematically showing an exemplary configuration of the energy storage system 10 according to an 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 capable of discharging a fire extinguishing liquid into the battery container 200 when a fire occurs in the battery container 200. And the water injection container 300 may be described as a water injection unit (WIU).

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

[0130] For example, in the embodiment of FIG. 3, the water injection container 300 may be electrically connected to the AC unit 120 via the AC line ACL. And the water injection container 300 may receive the supply of 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 the third communication line CL3.

[0132] For example, the water injection container 300 may include a control unit and a water injection unit. The control unit may control the water injection unit so that the fire extinguishing liquid is discharged when receiving a water injection command from the master controller 132.

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

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

[0135] For example, when a fire breaks out in the battery container 200, the control unit can receive a water injection command. The control unit can control the water injection unit so that the water injection unit discharges the fire extinguishing liquid into the pipeline PL. In this case, since the valve in the pipeline PL corresponding to the battery module where the fire has occurred should be damaged, the fire extinguishing liquid can flow into the interior of the battery module through the pipeline PL.

[0136] In the embodiment of FIG. 5, the master controller 132 can be connected to be communicable with the water injection container 300 via the third communication line CL3. For example, the third communication line CL3 can be a communication line applied to the third communication protocol. To give a specific example, the third communication line CL3 can be a communication line for Modbus RTU communication.

[0137] The energy storage system 10 according to an embodiment of the present invention has an advantage that by constructing independent communication paths using the first communication line CL1, the second communication line CL2, and the third communication line CL3 respectively, the communication stability for each communication path can be ensured.

[0138] As described above, the present invention has been described with reference to limited embodiments and drawings. However, the present invention is not limited thereto, and it goes without saying that various modifications and variations are possible within the equivalent scope of the technical idea and claims of the present invention by those having ordinary knowledge in the technical field to which the present invention belongs.

[0139] In addition, the present invention described above can be variously substituted, modified, and changed by those having ordinary knowledge in the technical field to which the present invention pertains, without departing from the technical idea of the present invention. Therefore, it is not limited by the above-described embodiments and the accompanying drawings, and all or part of each embodiment can be selectively combined and configured for various modifications.

Description of Reference Numerals

[0140] 10 Energy storage system 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 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-control unit 221 Slave controller 222 RBMS 223 Power supply unit 230 Sub-switch 300 Water injection container

Claims

1. An energy storage system comprising: 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, The control container comprises: 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; a main control unit connected to the AC unit to receive power from the electrical system via the AC line and communicably connected to the power conversion system (PCS); 23. An energy storage system comprising:

2. The DC section is 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; a fuse connected to the other end of the main switch and configured to be located in the DC line; 10. The energy storage system of claim 1 further comprising:

3. The fuse is The energy storage system of claim 2 , wherein the DC section is included in a number corresponding to the number of battery containers.

4. The fuse is The energy storage system according to claim 3 , configured to be detachable from the DC unit.

5. 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 a surge current from flowing in the DC line; 3. The energy storage system of claim 2, further comprising:

6. The AC unit is A first switch configured to have one end connected to the electrical system; An uninterruptible power supply unit configured such that one end is 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; a third switch having 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; 10. The energy storage system of claim 1 , comprising:

7. The battery container comprises:

2. 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.

8. The main control unit is 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:

9. The battery container comprises: One or more battery racks connected to the DC unit and configured to receive the DC power supply via the DC line; a sub-controller connected to the AC unit to receive power from the electrical system via the AC line, and connected to be able to communicate with the main control unit via the first communication line and the second communication line; 9. The energy storage system of claim 8, comprising:

10. The sub-control unit includes: 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; 10. The energy storage system of claim 9, comprising:

11. The master controller: The energy storage system according to claim 10, wherein when a plurality of the battery containers are deployed, the battery containers are directly connected to each of a plurality of slave controllers included in the plurality of battery containers via the first communication line.

12. The bank battery management system (BBMS) includes:

11. The energy storage system according to claim 10, wherein when the battery container is multiple, the battery containers are configured to be connected in series to multiple rack battery management systems (RBMSs) included in the multiple battery containers via the second communication line in a daisy chain manner.

13. 10. The energy storage system of claim 9, further comprising a water injection container configured to be connected to the AC unit to receive power from the electrical system via the AC line, to be connected to the master controller via a third communication line, and to be connected to each of the battery racks via a pipeline.

14. The water injection container comprises:

14. The energy storage system of claim 13, configured to release an internal fire extinguishing fluid into the pipeline upon receiving a water injection command from the master controller.

15. The battery container comprises:

2. 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.

Images