Energy storage systems

Abstract

The present invention provides an energy storage system that incorporates a drainage structure capable of easily recovering and processing firefighting water used to suppress fires. [Solution] The energy storage system according to the present invention includes one or more battery racks in which a plurality of battery modules are stacked, and a container provided to house the battery racks inside, wherein the container may include a floor panel on which the battery racks are placed, and a fire extinguishing water recovery chamber provided below the floor panel, with at least one side communicating with the floor panel so that fire extinguishing water falling from the battery racks can flow into it.

Description

Technical Field

[0001] The present invention relates to an energy storage system, and more specifically to an energy storage system capable of collecting fire extinguishing water used for fire suppression at one location for disposal, or reusing the water for suppressing battery fires.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0054390 and Korean Patent Application No. 10-2022-0054391 filed on May 2, 2022, and all contents disclosed in the specification and drawings of the said applications are incorporated into this application.

Background Art

[0003] Currently, widely used secondary batteries include lithium ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and the like. Among these, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, thus allowing free charging and discharging, and are attracting attention for their advantages of extremely low self-discharge rate and high energy density.

[0004] Generally, lithium secondary batteries can be roughly classified according to the shape of the outer packaging into can-type secondary batteries in which an electrode assembly is housed in a metal can, and pouch-type secondary batteries in which an electrode assembly is housed in a pouch formed of an aluminum laminate sheet.

[0005] A secondary battery may be used alone, but generally, a single secondary battery only has a voltage of approximately 2.5 V to 4.5 V, so when a higher output voltage is required, a plurality of secondary batteries are connected to each other in series and / or in parallel to form a battery module. The battery module may be used alone, or two or more battery modules may be electrically connected to each other in series and / or in parallel to form a higher-level device such as a battery rack or a battery pack.

[0006] On the other hand, in recent years, with issues such as power shortages and environmentally friendly energy being highlighted, energy storage systems that include multiple battery racks to store power during off-peak hours and are configured to use the stored power during peak hours have been attracting attention.

[0007] For example, an industrial energy storage system comprises a battery rack consisting of a rack case and numerous battery modules housed vertically within the rack case, an air conditioning unit for controlling the temperature of the battery rack, and a container providing space for housing the components.

[0008] More recently, as a safety measure in the event of a fire in an energy storage system, a fire suppression system has been introduced that is designed to extinguish a fire by injecting fire suppression water into a specific battery module before the heat spreads to other battery modules, in the event of thermal runaway of battery cells inside that module mounted on the battery rack.

[0009] However, after firefighting water is supplied to the battery racks and the interior spaces of the containers to suppress the fire, some remains on the floor of the battery racks and containers. The process of collecting and disposing of this used firefighting water (wastewater) is by no means easy, requiring a great deal of effort and time.

[0010] On the other hand, in order to supply firefighting water to the inside of the container in the event of a fire, a water tank containing a certain amount of firefighting water is placed around the container. Since the water tank cannot be filled with more than a predetermined capacity of firefighting water, if a fire occurs and the firefighting water leaks out of the tank, it must be refilled with more than a certain amount of firefighting water. However, refilling the water tank requires bringing tap water, which is located close to the energy storage system, to the tank, and if this is inconvenient, it may be necessary to call a fire truck or other emergency services. [Overview of the project] [Problems that the invention aims to solve]

[0011] This invention was created to solve the above-mentioned problems, and the technical problem that this invention aims to solve is to provide an energy storage system to which a drainage structure is applied that can easily recover and process firefighting water used to suppress a fire.

[0012] Another technical problem that the present invention aims to solve is to provide an energy storage system that allows for the reuse of fire-extinguishing water by recovering the water used to suppress a fire and refilling it into a water tank.

[0013] The technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned should be clearly understood by those skilled in the art from the description of the invention below. [Means for solving the problem]

[0014] The energy storage system according to the present invention includes one or more battery racks in which a plurality of battery modules are stacked, and a container provided to house the battery racks inside, wherein the container may include a floor panel on which the battery racks are placed, and a fire extinguishing water recovery chamber provided below the floor panel, with at least one side communicating with the floor panel so that fire extinguishing water falling from the battery racks can flow into it.

[0015] The floor panel includes a rack installation area where the battery rack is installed, and a drainage area which is open to allow fire extinguishing water to fall, with the fire extinguishing water recovery chamber located vertically below it. The fire extinguishing water recovery chamber may be provided with a bottom surface that slopes so that the fire extinguishing water flowing in through the drainage area accumulates on the wall side of the container.

[0016] The system may include a valve unit coupled to the wall of the container for draining the fire extinguishing water accumulated in the fire extinguishing water recovery chamber to the outside of the container.

[0017] A water level sensor may be installed inside the fire extinguishing water recovery chamber, and the valve unit may be configured to open and close based on the signal from the water level sensor.

[0018] A drainage pump may be provided inside the fire extinguishing water recovery chamber, and the drainage pump may be configured to operate based on the signal from the water level sensor.

[0019] There are multiple battery racks, which can be arranged in N rows on the floor panel.

[0020] The drainage area may be located in the area between rows of battery racks on the floor panel, or in the area between the side wall of the container and the outermost row of battery racks.

[0021] The drainage area may be covered with a plate-like body having a porous structure.

[0022] The container may further include a water tank located outside the container, a fire extinguishing water supply pipe connecting the water tank and the battery rack, and a fire extinguishing water recovery pipe connecting the fire extinguishing water recovery chamber and the water tank.

[0023] The fire water recovery chamber may be equipped with a water level sensor and a drainage pump, and when the water level sensor detects that the water level in the fire water recovery chamber has reached a certain height, the drainage pump may be activated and the fire water may be moved to the water tank via the fire water recovery piping.

[0024] The battery rack comprises: a plurality of battery modules; a rack case provided with accommodating portions that are configured to allow the plurality of battery modules to be respectively fitted and accommodated at every predetermined height, and each have a structure where the upper, lower, left and right sides excluding the front side and the rear side are blocked; rack connection pipes connected to each of the plurality of battery modules accommodated in the accommodating portions for supplying fire extinguishing water in case of fire; and a drainage guide unit disposed on at least one of the front outer side surface and the rear outer side surface of the rack case, the drainage guide unit guiding drainage of fire extinguishing water such that the fire extinguishing water discharged to the outside of the battery module when fire extinguishing water is injected into the battery module falls to a position spaced a predetermined distance apart from the outer side surface of the rack case.

[0025] Among every two vertically adjacent battery modules, the drainage guide unit can be coupled to the outer side surface of the rack case at a position lower than the battery module located at the upper part and higher than the battery module located at the lower part.

[0026] The drainage guide unit can protrude from the outer side surface of the rack case so as to be inclined at a predetermined angle to form an eave structure.

[0027] The drainage guide unit can be rotatably coupled to the outer side surface of the rack case.

[0028] The drainage guide unit can be rotated downward, and is provided to form an eave structure for the accommodating portion located at the lower part of the drainage guide unit.

[0029] The drainage guide unit can comprise: a drainage guide plate provided in the shape of a plate that is hinge-coupled to the outer side surface of the rack case; and a stopper that limits rotation of the drainage guide plate such that the drainage guide plate forms a predetermined angle with respect to the outer side surface of the rack case.

[0030] The energy storage system may further include a rack base that protrudes upward from the floor panel and supports the battery rack at a predetermined height away from the floor panel, and a fence that surrounds the rack base at a predetermined distance from the rack base, protrudes upward from the floor panel, and has at least one drainage hole on its side. [Effects of the Invention]

[0031] According to the present invention, it is possible to provide an energy storage system that incorporates a drainage structure capable of easily recovering and treating fire-extinguishing water used to suppress a fire.

[0032] Furthermore, according to the present invention, the fire-extinguishing water used to suppress a fire can be recovered and refilled into the water tank, making it possible to reuse the fire-extinguishing water. Therefore, an effect similar to increasing the capacity of the water tank can be obtained.

[0033] Furthermore, according to the present invention, when fire-extinguishing water is supplied to a target battery module (a battery module where a thermal event has occurred) to suppress a fire, it becomes possible to provide a battery rack that prevents other surrounding battery modules from being damaged by flooding.

[0034] The effects of the present invention are not limited to those described above, and other effects not mentioned herein will be clearly understood by a person with ordinary skill in the art to which the present invention pertains from this specification and the accompanying drawings.

[0035] The drawings accompanying this specification illustrate preferred embodiments of the present invention and are intended to further illustrate the technical idea of ​​the invention along with the content of the invention; therefore, the present invention shall not be construed as being limited only to what is shown in the drawings. [Brief explanation of the drawing]

[0036] [Figure 1] This diagram schematically shows the configuration of an energy storage system according to one embodiment of the present invention. [Figure 2] This is a schematic plan view of an energy storage system according to one embodiment of the present invention. [Figure 3] This is a schematic cross-sectional view of an energy storage system according to one embodiment of the present invention. [Figure 4] This figure shows a central area of ​​the floor panel of a container according to one embodiment of the present invention. [Figure 5] This is a cross-sectional view of part A in Figure 4. [Figure 6] This figure shows a battery rack according to one embodiment of the present invention, before the battery modules are inserted. [Figure 7] This figure shows a battery rack according to one embodiment of the present invention, specifically the battery rack after the battery modules have been inserted. [Figure 8] Figure 7 is a front view of the battery rack. [Figure 9] Figure 7 shows the battery rack viewed from the rear. [Figure 10] Figure 7 is a rear view of the battery pack. [Figure 11] This is a diagram showing the rear view of a battery module according to one embodiment of the present invention, which is equipped with air conditioning vents and a water supply valve. [Figure 12] Figure 11 is a partially exploded view of the battery module. [Figure 13] Figure 11 is a schematic cross-sectional view of the battery module. [Figure 14] This figure illustrates an example of firefighting water being injected into and drained from a battery rack according to one embodiment of the present invention. [Figure 15] This figure schematically shows the configuration of an energy storage system according to another embodiment of the present invention. [Figure 16] This is a schematic plan view of an energy storage system according to another embodiment of the present invention. [Figure 17] This is a schematic cross-sectional view of an energy storage system according to one embodiment of the present invention. [Modes for carrying out the invention]

[0037] Preferred embodiments of the present invention will now be described in detail based on the accompanying drawings. Prior to this, terms and words used in this specification and in the claims are not to be interpreted in their ordinary or dictionary sense, but rather in accordance with the principle that inventors may appropriately define the concepts of terms to best describe their invention, and are to be interpreted in a sense corresponding to the technical idea of ​​the present invention. Therefore, the embodiments described herein and the configurations shown in the drawings represent only preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention; it should be understood that, at the time of filing, there may be a variety of equivalent and modified embodiments that can be substituted therefor.

[0038] Figure 1 is a schematic diagram showing the configuration of an energy storage system according to one embodiment of the present invention, Figure 2 is a schematic plan view of the energy storage system according to one embodiment of the present invention, Figure 3 is a schematic cross-sectional view of the energy storage system according to one embodiment of the present invention, and Figure 4 is a diagram showing a central region of the floor panel of a container according to one embodiment of the present invention.

[0039] Referring to these drawings, an energy storage system 10 according to one embodiment of the present invention includes a container 100 and one or more battery racks 200 that can be housed inside the container 100. The container may include a floor panel 120 on which the battery racks 200 are placed, and a fire water recovery chamber 130 located below the floor panel 120 and provided such that at least one side communicates with the floor panel 120 so that fire water falling from the battery racks 200 can flow into it.

[0040] As will be explained in more detail later, the energy storage system 10 according to one embodiment of the present invention is equipped with a fire extinguishing water recovery chamber 130 that can collect and process the fire extinguishing water (wastewater) used to suppress the fire on one side of the wall, so that the fire extinguishing water (wastewater) can be processed quickly after the fire has ended.

[0041] The battery rack 200 may be formed in a configuration in which multiple battery modules 210 are stacked. Each battery module 210 may be formed in a configuration in which multiple secondary batteries are housed in a module housing 212. Each battery module 210 may be housed in a rack case 220 and formed in a configuration stacked in at least one direction. For example, each battery module 210 may be formed in a configuration stacked vertically via the rack case 220.

[0042] Multiple battery racks 200 can be arranged inside the container 100 along at least one direction. For example, an energy storage system 10 according to one embodiment of the present invention may be formed in a shape in which six battery racks 200 are arranged in two rows of three inside the container 100, as shown in Figure 1. Needless to say, the number of battery racks 200 included in the energy storage system 10 may be more or less than six. Also, depending on the size of the container 100 and the number of battery racks 200, they may be arranged in three rows, four rows, or the like, different from this embodiment. That is, the battery racks 200 can be arranged in N rows (where N is a natural number) on the floor plate 120 inside the container 100.

[0043] Furthermore, a battery rack 200 according to one embodiment of the present invention may be configured such that, after fire-extinguishing water is supplied into the rack case 220 to suppress a fire, the fire-extinguishing water is drained to the front or rear of the rack case 220. For example, as shown in Figure 1, the rack case 220 may be configured such that the top and bottom (±Z) and left and right (±X) sides are closed, and only the front and rear (±Y) sides are open. With such a configuration of the rack case 220, the fire-extinguishing water (wastewater) used to suppress the fire can be drained to the front or rear of the rack case 220.

[0044] As shown in Figures 1 to 3, the container 100 includes a floor panel 120 on which the battery rack 200 is placed, and walls surrounding a fire water recovery room 130 and internal space located below the floor panel 120. Here, the walls include a first wall panel 111, a third wall panel 113 facing and parallel to the first wall panel 111, a second wall panel 112 intersecting the first wall panel 111 with both ends connected to the first wall panel 111 and the third wall panel 113, and a fourth wall panel 114 facing and parallel to the second wall panel 112 with both ends connected to the first wall panel 111 and the third wall panel 113. The container 100 is preferably made of a metal material such as steel, but as an alternative, it may be provided in the form of a concrete structure.

[0045] The floor panel 120 may include a rack installation area 121 and a drainage area 123. Here, the rack installation area 121 is the area where the battery racks 200 are installed, and the drainage area 123 is an area that is open so that fire extinguishing water (wastewater) can fall down from the floor panel 120, and the fire extinguishing water recovery room 130 is located vertically below it.

[0046] When the battery racks 200 are arranged in N rows, there may be N rack installation areas 121, and the drainage area 123 may be located in the area between the rows of battery racks 200 arranged in the N rack installation areas 121, or in the area between the side wall of the container 100 and the outermost row of battery racks 200.

[0047] For example, as shown in Figure 1, the rack installation area 121 according to this embodiment includes a first rack installation area 121A and a second rack installation area 121B so that the battery racks 200 can be arranged in two rows. The first rack installation area 121A and the second rack installation area 121B may be located at a predetermined distance apart from each other (in the Y direction). Three battery racks 200 may be arranged in the first rack installation area 121A along the X direction, and the other three battery racks 200 may be arranged in the second rack installation area 121B along the X direction, so that six battery racks 200 can be arranged in two rows of three.

[0048] In this configuration, each battery rack 200 may be positioned so that the front or rear of the rack case faces the drainage area 123, in the direction from which the fire extinguishing water is drained. Each battery rack 200 may also be configured to be connectable to a fire extinguishing water supply pipe 400 to receive fire extinguishing water in an emergency. The fire extinguishing water supply pipe 400 may be connected to a water tank 300 located outside the container 100.

[0049] Each battery rack 200 may be configured to receive fire-extinguishing water from the water tank 300 outside the container 100 via the fire-extinguishing water supply pipe 400 in the event of a thermal event occurring in the battery module 210 contained therein, and the fire-extinguishing water used to extinguish the fire may be drained to the front or rear of the rack case 220.

[0050] The drainage area 123 according to this embodiment may include a central drainage area 123A located in the center of the floor panel 120, and a first side drainage area 123B and a second side drainage area 123C located on both sides of the floor panel 120.

[0051] The central drainage area 123A may be located between the first rack installation area 121A and the second rack installation area 121B, in other words, in the area between the first row of battery racks 200 and the second row of battery racks 200. The first side drainage area 123B may be located in the area between the fourth wall surface 114 and the first rack installation area 121A, and the second side drainage area 123C may be located in the area between the second wall surface 112 and the second rack installation area 121B.

[0052] According to the above configuration, as shown in Figure 2, the fire extinguishing water used to suppress the fire in the first row of battery racks 200 can be drained from the first row of battery racks 200 in the +Y direction or the -Y direction. In this case, the fire extinguishing water drained in the -Y direction flows into the central drainage area 123A, and the fire extinguishing water drained in the +Y direction can flow into the first side drainage area 123B.

[0053] Furthermore, the fire-extinguishing water used to suppress the fire in the second row of battery racks 200 can be drained from the second row of battery racks 200 in the +Y direction or the -Y direction. In this case, the fire-extinguishing water drained in the +Y direction can flow into the central drainage area 123A, and the fire-extinguishing water drained in the -Y direction can flow into the second side drainage area 123C.

[0054] The drainage area 123 may be configured to be covered by a porous plate-like body C1 (see Figure 1). For example, by covering the drainage area 123 with a grating structure, workers can be allowed to move over the drainage area 123, i.e., the fire water recovery room 130.

[0055] The fire water recovery chamber 130 (see Figure 3) can be described as a storage space located below the floor panel 120 for the temporary storage of fire water. Fire water can fall from the drainage area 123 and flow into the fire water recovery chamber 130. The fire water recovery chamber 130 may be formed with a sloping bottom surface 131 so that the fire water accumulates on the wall side of the container 100. For example, the bottom surface 131 of the fire water recovery chamber 130 may be provided with a sloping shape as it progresses from the third wall surface 113 side toward the first wall surface 111 side. In this case, as the fire water moves along the sloping bottom surface 131, the fire water will accumulate inside the fire water recovery chamber 130 on the first wall surface 111 side of the container 100.

[0056] On the other hand, the fire water recovery chamber 130 according to this embodiment is located vertically below each drainage area 123, corresponding to the central drainage area 123, the first side drainage area 123, and the second side drainage area 123, and is configured to be connected to each other on the first wall surface 111 side. That is, there are no drainage channels vertically below the first rack installation area 121 and the second rack installation area 121, and the fire water recovery chamber 130 is partitioned off. This is to narrow the drainage passage through which the fire water can move under the floor panel 120, allowing the fire water to move quickly and accumulate on the first wall surface 111 side. In another embodiment, in order to increase the storage capacity of the fire water recovery chamber 130, the partition of the fire water recovery chamber 130 may be eliminated, so that the entire space under the floor panel 120 is configured as a space for fire water recovery. Alternatively, if the battery rack 200 is configured such that fire extinguishing water is drained only in the direction toward the central drainage area 123A, the first side drainage area 213B and the second side drainage area 213C may be eliminated, and the fire extinguishing water recovery chamber 130 may be configured accordingly only in the lower part of the central drainage area 123A.

[0057] More specifically, referring to Figures 3 to 4 which show the implementation configuration of the central drainage area 123, when firefighting water flows out from the first row of battery racks 200 or the second row of battery racks 200 in the -Y direction or +Y direction, it first moves to the central drainage area 123, and from the central drainage area 123 it may fall down and flow into the firefighting water recovery chamber 130. The firefighting water that has flowed into the firefighting water recovery chamber 130 in this way will secondarily move along the inclined bottom surface 131 of the firefighting water recovery chamber 130 toward the first wall surface 111. As a result, the firefighting water accumulates toward the first wall surface 111, and the water level of the firefighting water increases as it moves toward the first wall surface 111.

[0058] Here, the inclination of the fire water recovery chamber 130, indicated by J1 in Figure 4, can be determined, for example, within the range of 5° to 60°, taking into consideration the length of the container 100 in the X direction. Furthermore, a check stop step 132 may be provided on the bottom surface 131 of the fire water recovery chamber 130. The check stop step 132, as shown in Figure 5, prevents the backflow of the fire water on the bottom surface 131 of the fire water recovery chamber 130 and also prevents slipping when workers clean the fire water recovery chamber 130, and may be provided at predetermined intervals along the inclined surface.

[0059] Returning to Figures 2 and 3, as described above, the energy storage system according to one embodiment of the present invention may further include a valve unit 140, a water level sensor 150, and a drain pump 160 as means for draining the fire extinguishing water accumulated in the fire extinguishing water recovery chamber 130 to the outside of the container 100.

[0060] The valve unit 140 refers to a mechanical device that blocks a flow path or controls the flow rate. For example, the valve unit 140 can be implemented as a ball valve or a gate valve. The valve unit 140 may be configured to be located on the wall of the container 100, i.e., outside the first wall surface 111 in this embodiment, and to be connected to the fire water recovery chamber 130 via a drain pipe that penetrates the first wall surface 111. When the amount of fire water in the fire water recovery chamber 130 exceeds a certain amount, opening the valve unit 140 allows the fire water to be drained outside the container 100.

[0061] According to the structure of the fire extinguishing water recovery chamber 130 in this embodiment, the water level of the fire extinguishing water increases as you move toward the first wall surface 111. Therefore, by arranging the valve unit 140 below the first wall surface 111 and opening the valve unit 140, the difference in water levels of the fire extinguishing water allows the fire extinguishing water to be smoothly drained outside the container 100.

[0062] However, as the water level of the firefighting water gradually decreases, the flow rate and velocity of the firefighting water flowing into the valve unit 140 decrease, which may make it difficult to completely drain the firefighting water from the firefighting water recovery chamber 130 outside the container 100. Furthermore, the valve unit 140 must be opened at the latest before the firefighting water recovery chamber 130 is completely filled with firefighting water. Otherwise, there is a risk that the firefighting water will overflow onto the floor panel 120.

[0063] The water level sensor 150 and the drainage pump 160 can be used as a solution to resolve the problems described above.

[0064] As shown in Figure 3, a water level sensor 150 capable of sensing the water level of the fire extinguishing water is installed inside the fire extinguishing water recovery chamber 130, and the valve unit 140 may be configured to open and close based on the signal from the water level sensor 150. For example, the water level sensor 150 may be configured to transmit a signal for drainage to the valve control unit or sound an alarm when the water level of the fire extinguishing water reaches a predetermined level. In this case, the valve unit 140 may be configured to be opened automatically by the valve control unit or opened manually by an operator who hears the alarm.

[0065] Furthermore, a drainage pump 160 may be installed inside the fire water recovery chamber 130. The drainage pump 160 may be configured to operate based on a signal from the water level sensor 150. For example, similar to the valve unit 140, when the water level sensor 150 detects a predetermined water level, the signal from the water level sensor 150 is transmitted to the drainage pump 160, and the operating switch of the drainage pump 160 is turned on, causing the fire water to move to a drain pipe connected to the valve unit 140.

[0066] According to the configuration and operation of the energy storage system 10 of one embodiment of the present invention to which such a drainage structure is applied, the fire extinguishing water (wastewater) used to suppress the fire can be easily recovered and treated, and the time required to restart the energy storage system 10 after the fire situation has ended can be shortened. In addition, the fire extinguishing water can be moved to an even safer location by connecting external piping to the valve unit 140, or the fire extinguishing water (whose volume has been reduced by draining the fire extinguishing water to suppress the fire) can be moved to the water tank 300, thereby increasing the capacity of the water tank 300.

[0067] Figure 6 shows a battery rack 200 according to one embodiment of the present invention, before the battery module 210 is inserted into the battery rack 200; Figure 7 shows a battery rack 200 according to one embodiment of the present invention, after the battery module 210 is inserted into the battery rack 200; Figure 8 is a front view of the battery rack 200 of Figure 7; Figure 9 is a rear view of the battery rack 200 of Figure 7; and Figure 10 is a rear view of the battery pack of Figure 7.

[0068] Next, with reference to Figures 6 to 10, a battery rack 200 included in the energy storage system 10 according to one embodiment of the present invention will be described.

[0069] Referring to these drawings, a battery rack 200 according to one embodiment of the present invention may include a plurality of battery modules 210, a rack case 220, rack connection piping 230 and a drainage guide unit 240.

[0070] Each battery module 210 may include a secondary battery 211 and a module housing 212 that houses the secondary battery 211, and may be configured to store and release electrical energy. Here, the secondary batteries 211 may be connected in series and / or parallel within the module housing 212, depending on the capacity and output required for the battery module 210.

[0071] Furthermore, each battery module 210 may be equipped with a cooling fan 214 and air vents 216 as means for dissipating the heat generated during charging and discharging. For example, the cooling fan 214 may be provided on the front of the module housing 212, and the air vents 216 may be provided on the rear of the module housing 212. When the cooling fan 214 is operating, outside air enters the battery module 210 through the air vents 216 on the rear of the battery module 210, absorbing the heat of the secondary battery 211, and is then discharged to the outside through the cooling fan 214 on the front of the battery module 210. Conversely to this embodiment, the cooling fan 214 may be provided on the rear of the battery module 210, and the air vents 216 may be provided on the front of the battery module 210.

[0072] Furthermore, each battery module 210 may be configured to directly supply fire-extinguishing water into the module housing 212 in preparation for situations where thermal events such as thermal runaway, ignition, or explosion may occur in the secondary battery 211 during charging and discharging. For example, rack connection piping 230 may be connected to the back of each battery module 210 so that fire-extinguishing water is injected into the battery module 210 when a thermal event occurs. Details of this will be described later.

[0073] As shown in Figure 7, the rack case 220 can be provided in a generally rectangular parallelepiped shape so that the plurality of battery modules 210 can be fitted and housed inside at predetermined height intervals. The rack case 220 can also be made of a rigid material to adequately protect the battery modules 210 from shocks and vibrations, preferably from a metallic material, but can also be made from a non-metallic material that has excellent mechanical rigidity.

[0074] In particular, a rack case 220 according to one embodiment of the present invention is provided with a plurality of storage compartments 221 along the vertical direction, and each of the storage compartments 221 is configured to accommodate a battery module 210. Each storage compartment 221 may have a structure in which the top, bottom, left, and right directions (+Z, -Z, -X, +X) are closed off, excluding the front -Y and rear +Y directions.

[0075] For example, unlike the present invention, in a rack case with an open shape on all sides (top, bottom, left, and right), if fire extinguishing water is supplied to the inside of a particular battery module, the fire extinguishing water will leak out because the battery module is not completely sealed. As a result, battery modules located below that battery module will suffer damage from flooding. To solve this problem, the rack case 220 according to one embodiment of the present invention is configured such that, when suppressing a fire using fire extinguishing water, the top, bottom, left, and right sides of each housing section 221 are closed, and only the front and rear are open, in order to prevent damage to other battery modules 210 from flooding and to guide the drainage of fire extinguishing water forward or backward.

[0076] Furthermore, when the fire extinguishing water discharged from the battery module 210 moves to the front or rear of the rack case 220 and falls outside the rack case 220, a drainage guide unit 240 may be provided on at least one of the front and rear outer surfaces of the rack case 220 so that it falls at a predetermined distance from the outer surface of the rack case 220.

[0077] Such a drainage guide unit 240 can be provided to protrude from the outer surface of the rack case 220 at a predetermined angle, as shown in Figure 7, to form an overhang structure. Here, the overhang refers to the portion that protrudes outward with respect to the outer surface of the rack case 220, and serves to protect and shield the battery module 210 in the housing 221 located below from fire extinguishing water falling from above. Furthermore, by configuring the battery rack 200 to form an overhang structure as described above, the drainage guide unit 240 may also serve to prevent vent gas or flames ejected from the battery module 210 in the event of ignition from spreading to battery modules 210 located above or below it.

[0078] As shown in Figures 7 and 8, the drainage guide unit 240 can be coupled to the outer surface of the rack case 220 at a position lower than the upper battery module 210 and higher than the lower battery module 210 of two adjacent battery modules 210 located vertically. That is, multiple drainage guide units 240 can be arranged along the vertical direction and coupled to the outer surface of the rack case 220 at height intervals between the upper battery module 210 and the lower battery module 210. For example, in this embodiment, seven battery modules 210 are stacked vertically on the battery rack 200. In this case, six drainage guide units 240 can be coupled to the front outer surface 220F of the rack case 220, and six can be coupled to the rear outer surface 220R of the rack case 220. As a result, even if a thermal event occurs in any of the seven battery modules 210 and fire extinguishing water is injected, the other battery modules 210 will not be affected by flooding from the fire extinguishing water.

[0079] Referring to Figure 8, the front of the rack case 220 is shown to have a drainage guide unit 240 positioned so as to partially obstruct the front of the open end of the housing section 221 located below it. In this case, if one attempts to immediately insert the battery module 210 into the housing section 221 in a horizontal position, it will be obstructed by the drainage guide unit 240 and will not be able to be inserted into the housing section 221. Needless to say, unlike in this embodiment, the length of the eaves of the drainage guide unit 240 may be shortened to the extent that it does not interfere when inserting the battery module 210 into the housing section 221. However, in this embodiment, the length of the eaves of the drainage guide unit 240 is made longer in order to allow the drainage of fire extinguishing water by the drainage guide unit 240 to be performed more effectively.

[0080] In this case, there is a problem in that it becomes difficult to fit the battery module 210 into the housing 221. As a means to resolve this problem, the battery rack 200 according to this embodiment is provided with the drainage guide unit 240 rotatably mounted.

[0081] Furthermore, as shown in Figure 6, the drainage guide unit 240 is configured to be rotatable and attachable to the outer surface of the rack case 220 before the battery module 210 is fitted into the housing 221 of the rack case 220. In addition, the drainage guide unit 240 can be rotated upward to cover the housing 221 located above the drainage guide unit 240, or conversely, it can be rotated downward to form an overhang structure over the housing 221 located below it, as shown in Figure 7.

[0082] With the above configuration, when housing the battery module 210 in the rack case 220, for example, in the state shown in Figure 6, first the battery module 210 is fitted into the lowest housing section 221, and then the drainage guide unit 240 located directly above the lowest housing section 221 is rotated to form an overhang structure. This opens the second housing section 221 from the bottom, making it possible to fit the battery module 210. At this point, the second battery module 210 should be fitted into the second housing section 221. By fitting the battery modules 210 sequentially from the lowest housing section 221 to the uppermost housing section 221 using this method, all the battery modules 210 will be housed in the rack case 220, as shown in Figure 7, and all the drainage guide units 240 will form an overhang structure on the outer surface of the rack case 220.

[0083] To describe the rotating drainage guide unit 240 according to this embodiment in more detail, the drainage guide unit 240 may include a drainage guide plate 241 and a stopper 242.

[0084] The drainage guide plate 241 may be provided in the shape of a plate that is hinged 243 to the outer surface of the rack case 220. The drainage guide plate 241 is provided in a size that covers the storage section 221 above it when it is rotated upward and attached to the outer surface of the rack case 220, and may be made of any material that is rigid, such as plastic or metal. The drainage guide plate 241 may be equipped with a magnet 244 in the peripheral region opposite to the peripheral region to which it is hinged 243, as shown in the enlarged portion of Figure 6. The magnet 244 can be used to rotate the drainage guide plate 241 upward and fix it to the outer surface of the rack case 220.

[0085] As described above, the drainage guide plate 241 attached to the outer surface of the rack case 220 is rotated downwards (-Z direction) to protect the storage section 221 below it and form an overhang structure that partially shields it.

[0086] In this case, a stopper 242 can be applied to restrict the rotation of the drainage guide plate 241 so that it forms a predetermined angle θ with respect to the outer surface of the rack case 220. Here, the predetermined angle θ can be determined, for example, in the range of 30° to 60°.

[0087] In this embodiment, the stopper 242 may be provided as a projection extending from the peripheral region of the drainage guide plate 241 near the axis of rotation, so as shown in the enlarged view of Figure 7, that it contacts the outer surface of the rack case 220 at the predetermined angle θ.

[0088] Preferably, the shape of the projection is a roughly right-angled triangle in cross-section, and it can be provided to extend in an elongated manner by a length corresponding to the width of the drainage guide plate 241 on both sides (±X direction). With such a stopper 242, the drainage guide plate 241 is rotated downward and stops when the inclined surface of the right-angled triangle comes into contact with the outer surface of the rack case 220. This makes it possible for the drainage guide plate 241 to form an overhang structure that protrudes at a predetermined angle relative to the outer surface of the rack case 220.

[0089] On the other hand, the drainage guide unit 240 according to this embodiment includes a first drainage guide unit 240A, which is installed on the front outer surface 220F of the rack case 220, as shown in Figure 8, and a second drainage guide unit 240B, which is installed on the rear outer surface 220R of the rack case 220, as shown in Figures 9 and 10.

[0090] The first drainage guide unit 240A is provided to cover the front open end of each of the plurality of storage sections 221, and the second drainage guide unit 240B may be provided to cover the rear open end of each of the plurality of storage sections 221. For example, as mentioned above, the first drainage guide unit 240A is provided to cover the front open end of the storage section 221 when it is rotated upward (+Z direction) and attached to the front outer surface of the rack case 220, as shown in Figure 6, and similarly, the second drainage guide unit 240B may be provided to cover the rear open end of the storage section 221 when it is rotated upward (+Z direction) and attached to the rear outer surface of the rack case 220.

[0091] In other words, as shown in Figures 8 and 10, if the size of the front open end and the size of the rear open end of the housing section 221 are different, the sizes of the first drainage guide unit 240A and the second drainage guide unit 240B may be provided to be different to correspond to this.

[0092] In particular, in this embodiment, each storage section 221 of the rack case 220 is provided such that the width of the rear open end on the left and right (±X direction) is narrower than the width of the front open end on the left and right. In other words, as shown in Figure 10, the width of the rear open end of the storage section 221 is provided to be a width corresponding to "L1". This is to arrange the rack connection piping 230 and the second drainage guide unit 240B on the rear outer surface 220R of the rack case 220 so that they do not interfere with each other. That is, the rack connection piping 230 can be placed in the remaining portion corresponding to "L2" in Figure 10 to avoid interference with the second drainage guide unit 240B.

[0093] The rack connection piping 230 is a component for supplying fire extinguishing water to each battery module 210 in an emergency, and is connected so as to communicate with a fire extinguishing water supply piping 400 on one end, and may be configured to pass through the rear outer surface of the rack case 220 and connect to the battery modules 210 located inside the housing 221. For example, as shown in Figure 9, the rack connection piping 230 may include a main pipe 231 arranged vertically along the rack case 220, and a plurality of connecting nozzles 232 branching off from the main pipe 231 in a crisscross manner, with each connecting nozzle 232 passing through the rear outer surface of the rack case 220 and connecting to a water supply valve 217 located on the rear of the battery module 210. For reference, each of the connecting nozzles 232 may be fitted inside the rack case 220 through through holes (not shown) provided on the outer surface of the rear of the rack case 220.

[0094] Next, referring to Figures 11 to 13, we will describe the configuration of the battery module 210 for introducing fire-extinguishing water into the battery module 210 in the event of thermal runaway or ignition of the secondary battery 211.

[0095] As described above, the battery module 210 may include a module housing 212, a secondary battery 211 housed inside the module housing 212, an air conditioning vent 216 and a water supply valve 217 provided on the back of the module housing 212, and a cooling fan 214 provided on the front of the module housing 212.

[0096] Therefore, when the battery module 210 is fitted into the housing section 221 of the rack case 220, the cooling fan 214 can be positioned on the front side of the rack case 220, and the air conditioning holes 216 and water supply valve 217 can be positioned on the rear side of the rack case 220. When such a battery module 210 is fitted into the housing section 221 of the rack case 220, the lower side of the air conditioning holes 216 can be shielded by the rear outer surface of the rack case 220. That is, as shown by "K1" in Figure 10, the rack case 220 may be provided with a wall protruding from the bottom surface of each housing section 221 at the rear open end of each housing section 221. The wall serves to prevent fire extinguishing water from leaking out to the rear side of the housing section 221. The wall is a component for guiding drainage to the front side of the rack case 220, but it can be omitted when drainage is guided to both the front and rear sides of the rack case.

[0097] The module housing 212 has an internal space capable of accommodating a cell stack formed by stacking secondary batteries 211 in one direction, and can be provided in the shape of a box with a generally rectangular parallelepiped, consisting of a bottom plate, a top plate, left and right side plates 212a, a front plate 213, and a rear plate 215. Here, the six plates may be provided so as to be assembled and disassembled from one another, or some of the six plates may be manufactured as a single unit, while the remaining plates may be manufactured separately and provided so as to be partially assembled and disassembled.

[0098] A pouch-type secondary battery 211 can be used as the secondary battery 211. Multiple pouch-type secondary batteries 211 are stacked in one direction to create a cell stack, and the cell stack is housed inside the module housing 212.

[0099] The cell stack can be arranged inside the module housing 212 such that the longitudinal direction of the pouch-type secondary battery 211 intersects with the side plate 212a of the module housing 212. In other words, as shown in Figures 12 and 13, when the directions intersecting the stacking direction of the secondary battery 211 are defined as the front and back directions of the cell stack, the cell stack can be arranged such that the front and back portions face the left and right side plates 212a, respectively, with a predetermined distance between them. By arranging the cell stack inside the module housing 212 in this way, it becomes possible to secure an airflow space and a space in which the fire extinguishing unit 218 can be arranged inside the module housing 212.

[0100] The fire extinguishing unit 218 may include a pipe-shaped unit body 218a and a plurality of spray nozzles 218b, as shown in Figure 13.

[0101] The unit body 218a may be provided in the shape of a pipe extending along the longitudinal direction of the module housing 212, with one end connected to a water supply valve 217. The plurality of injection nozzles 218b may be arranged at predetermined intervals along the longitudinal direction of the unit body 218a, with their discharge ports facing the cell stack.

[0102] Although not shown in detail, each spray nozzle 218b may include a glass valve (not shown) that normally discharges fire extinguishing water and closes the outlet, and is designed to open the outlet when thermal damage is applied. The glass valve may contain a predetermined liquid or gas inside and be configured to break when heated due to the expansion of the liquid or gas's volume. With such a configuration, for example, if the temperature inside the battery module 210 rises to 70°C to 200°C or higher, or if flames or high-temperature vent gases cause thermal damage to the glass valve, the substance inside the glass valve expands, causing the glass valve to break and the outlet of the spray nozzle 218b to open. Then, the fire extinguishing water inside the unit body 218a can be discharged towards the cell stack through the outlet of the spray nozzle 218b.

[0103] Unlike this embodiment, in some cases, one end of the water supply valve 217 and the connecting nozzle 232 of the rack connecting pipe 230 are connected on the outside of the rear plate 215, and the other end of the water supply valve 217, i.e., the outlet to which the glass valve is connected, is located on the inside of the rear plate 215. In this case, the fire extinguishing unit 218 described above can be omitted from inside the module housing 212.

[0104] According to the fire extinguishing water supply method described above, it becomes possible to supply fire extinguishing water to the interior of only the battery module 210 in the battery rack 200 that has experienced a thermal event.

[0105] In the following section, with reference to Figure 14, we will describe the mechanism by which, when a thermal event occurs inside the battery module 210 and fire extinguishing water is supplied, the fire extinguishing water is then drained to the outside, in the configuration of the battery rack 200 according to one embodiment of the present invention.

[0106] For example, as shown in Figure 14, when a thermal event occurs in the second battery module 210 from the top among the battery modules 210 included in the battery rack 200, the discharge port of the spray nozzle 218b located inside the second battery module 210 opens. Then, due to the pressure difference, fire extinguishing water enters the battery module 210 from the rack connection piping 230 through the water supply valve 217 of the second battery module 210, moves along the unit body 218a, and is discharged from the discharge ports of each spray nozzle 218b.

[0107] In this way, by directly injecting fire-extinguishing water into the second battery module 210 where a thermal event has occurred, the fire and thermal runaway situation in the second battery module 210 can be suppressed more quickly and effectively in the early stages. As a result, the thermal runaway or propagation of flames to the other battery modules 210 can be blocked, and furthermore, the entire energy storage system 10, including the battery rack 200, can be prevented from burning out.

[0108] On the other hand, the module housing 212 of the battery module 210 is not completely sealed. That is, there may be gaps in the module housing 212 due to air vents 216, cooling fans 214, assembly tolerances, etc. Therefore, there is a risk that the fire extinguishing water introduced into the battery module 210 may leak out to the outside of the battery module 210 through the aforementioned parts. If the fire extinguishing water that has leaked out of the battery module 210 flows into other normal battery modules 210, there is a concern that those battery modules 210 may suffer serious water damage.

[0109] Therefore, as described above, the battery rack 200 according to one embodiment of the present invention is configured such that each battery module 210 is housed in a housing section 221 which has a structure in which the top, bottom, left, and right sides are closed off except for the front and rear, so that other normal battery modules 210 are not damaged by water ingress. For example, even if fire extinguishing water leaks from the second battery module 210, as shown in Figure 14, the fire extinguishing water is drained only from the front and rear sides of the rack case 220. Therefore, the possibility of other normal battery modules 210 being damaged by water ingress is very low.

[0110] Furthermore, when the fire extinguishing water is drained outside the housing 221 where the second battery module 210 is located, the flow of the fire extinguishing water is further guided outward along the drainage guide unit 240, so that the fire extinguishing water can fall from a position a predetermined distance away from the front outer surface or the rear outer surface of the rack case 220. In addition, since the drainage guide units 240 are arranged in multiple stages vertically along the height direction of the rack case 220, and the drainage guide units 240 that are relatively lower protect each battery module 210 from fire extinguishing water falling from the height of the second battery module 210, the possibility of other normal battery modules 210 below the second battery module 210 being damaged by water ingress is further reduced.

[0111] On the other hand, each battery rack 200 may be arranged to be fixed to the upper surface of a rack base 125 that protrudes upward from the floor panel 120 and supports the battery rack 200 at a predetermined height away from the floor panel 120. A fence 127, which surrounds the rack base 125 at a predetermined distance from the rack base 125 and has at least one drain hole 127a, may be provided on the floor panel 120 of the container 100.

[0112] As shown in Figure 14, when fire extinguishing water falls from the battery module, it accumulates in the space between the rack base 125 and the fence 127, and as shown in F3 or F4, it can move along the slope formed between the rack base 125 and the fence 127 and be discharged outside the fence 127 through the drain hole 127a. Here, once discharged as shown in F3 and F4, it may be configured to be guided to the central drain area 123A or the side drain areas 123B, 123C of the floor panel 120 (see Figures 1 and 4).

[0113] As described above, according to the battery rack 200 of one embodiment of the present invention, it is possible to prevent fire extinguishing water introduced into a battery module 210 where a thermal event has occurred from flowing into other surrounding battery modules 210.

[0114] Next, an energy storage system according to another embodiment of the present invention will be described with reference to Figures 15 to 17. The same component numbers as in the previously described embodiments refer to the same components, and redundant explanations of the same components will be omitted. The explanation will focus on the differences from the previously described embodiments.

[0115] An energy storage system 10 according to another embodiment of the present invention may include a container 100, one or more battery racks 200 housed in the internal space of the container 100, and a water tank 300 connected to the battery racks 200 via a fire extinguishing water supply pipe 400, which stores fire extinguishing water to be supplied to the battery racks 200 in an emergency. Here, the container 100 includes a floor panel 120 on which the battery racks 200 are arranged, and a fire extinguishing water recovery chamber 130 located below the floor panel 120, with at least one side communicating with the floor panel 120 so that fire extinguishing water falling from the battery racks 200 can flow into it. Furthermore, unlike the embodiments described above, the energy storage system according to another embodiment of the present invention further includes a fire extinguishing water recovery pipe 500 connecting the fire extinguishing water recovery chamber 130 and the water tank 300.

[0116] According to this other embodiment of the present invention, the energy storage system 10 allows the fire-extinguishing water used to suppress the fire to be automatically recovered and refilled into the water tank 300. Therefore, after the fire has subsided, there is virtually no need to clean or remove the fire-extinguishing water used to suppress the fire from inside the container 100 in order to restart the energy storage system 10. Furthermore, the fire-extinguishing water that has escaped from the water tank 300 is recovered and refilled into the water tank 300, which has the effect of increasing the storage capacity of the water tank 300.

[0117] Referring to Figures 16 and 17, as means for draining the fire extinguishing water accumulated in the fire extinguishing water recovery chamber 130 to the outside of the container 100, the energy storage system 10 according to another embodiment of the present invention may include a water level sensor 150 and a drainage pump 160.

[0118] The water level sensor 150 and the drain pump 160 are installed in the fire extinguishing water recovery chamber 130, and the drain pump 160 may be configured to operate when the water level sensor 150 detects that the water level in the fire extinguishing water recovery chamber 130 has reached a certain height. Here, the water level sensor 150 may be implemented by a level gauge or float switch that outputs a signal when the liquid level reaches a certain level, and the drain pump 160 may be implemented by a submersible pump that can operate underwater.

[0119] For example, when the water level in the fire water recovery chamber 130 reaches a certain level, the water level sensor 150 outputs a signal, and at this time, based on the signal, the operating switch of the drain pump 160 is turned on, causing the drain pump 160 to start operating and the fire water to be drained into the fire water recovery pipe 500.

[0120] The fire water recovery piping 500 is provided to extend from the fire water recovery chamber 130 through one side wall of the container 100, i.e., the first wall surface 111, to the water tank 300. Therefore, the action of the drainage pump 160 makes it possible to inject fire water into the water tank 300 via the fire water recovery piping 500. Alternatively, a valve unit (not shown), such as a ball valve or gate valve, which can block the flow path or control the flow rate, may be installed in the fire water recovery piping 500 to block the movement of fire water or control the flow rate.

[0121] In this way, by draining the fire-extinguishing water used to suppress the fire outside the container 100, the time required to restart the energy storage system 10 after the fire has subsided can be shortened. Furthermore, by recovering the fire-extinguishing water and storing it again in the water tank 300 (whose volume has been reduced by draining the water to suppress the fire), an effect can be obtained that is as if the storage capacity of the water tank 300 had been increased.

[0122] On the other hand, although not shown in the diagram for ease of drawing, the energy storage system 10 may further include an air conditioning system for managing the temperature inside the container 100 and a Master Battery Management System for integrated control of the battery rack 200.

[0123] As described above, although the present invention has been explained with limited embodiments and drawings, the technical idea of ​​the present invention is not limited in any way to these, and it goes without saying that it can be implemented by persons with ordinary skill in the art to which the present invention belongs with various modifications and variations within the equivalent scope of the technical idea and claims of the present invention.

[0124] In this specification, terms such as up, down, left, right, front, and back are used to indicate direction. However, these terms are for convenience of explanation, and it will be obvious to those skilled in the art that they may vary depending on the position of the object being discussed and the observer's position.

[0125] Furthermore, the present invention may include the following embodiments. [Section 1] One or more battery racks with multiple battery modules stacked on top of each other, A container provided to accommodate the aforementioned battery rack inside, Includes, The aforementioned container is An energy storage system comprising: a floor panel on which the battery racks are arranged; and a fire extinguishing water recovery chamber located below the floor panel, with at least one side communicating with the floor panel so that fire extinguishing water falling from the battery racks can flow into it. [Section 2] The floor panel includes a rack installation area where the battery rack is installed, and a drainage area which is open to allow fire extinguishing water to fall, with the fire extinguishing water recovery room located vertically below it. The aforementioned fire extinguishing water recovery room is The energy storage system according to item 1, wherein the bottom surface is sloped so that firefighting water flowing in through the drainage area accumulates on the wall side of the container. [Section 3] The energy storage system according to claim 2, further comprising a valve unit coupled to the wall of the container for draining the fire extinguishing water accumulated in the fire extinguishing water recovery chamber to the outside of the container. [Section 4] The energy storage system according to item 3, wherein a water level sensor is provided inside the fire extinguishing water recovery chamber, and the valve unit is configured to open and close based on the signal from the water level sensor. [Section 5] The energy storage system according to item 4, wherein a drainage pump is provided inside the fire extinguishing water recovery chamber, and the drainage pump is configured to operate based on a signal from the water level sensor. [Section 6] The energy storage system according to item 2, wherein there are multiple battery racks, arranged in N rows on the floor panel. [Section 7] The energy storage system according to paragraph 6, wherein the drainage area is located in the area between rows of the battery racks on the floor panel or in the area between the side wall of the container and the outermost row of the battery racks. [Section 8] The aforementioned drainage area is, The energy storage system described in item 2, which is covered by a plate-like body with a porous structure. [Section 9] A water tank located outside the aforementioned container, A fire extinguishing water supply pipe connecting the water tank and the battery rack, A fire water recovery piping connecting the fire water recovery room and the water tank, An energy storage system as described in any one of paragraphs 1 to 8, further including the following: [Section 10] A water level sensor and a drainage pump are installed in the aforementioned fire extinguishing water recovery room. The energy storage system according to paragraph 9, wherein when the water level sensor detects that the water level in the fire extinguishing water recovery chamber has reached a certain height, the drainage pump is activated and the fire extinguishing water moves to the water tank via the fire extinguishing water recovery piping. [Section 11] The aforementioned battery rack is Multiple battery modules, A rack case having a housing section provided to accommodate the multiple battery modules, each fitted into a predetermined height, and having a structure in which the top, bottom, left, and right sides are closed off except for the front and rear, Rack connection piping connected to each of the plurality of battery modules housed in the housing for supplying firefighting water in the event of a fire, A drainage guide unit is provided on at least one of the front outer surface and rear outer surface of the rack case to guide the drainage of fire extinguishing water so that when fire extinguishing water is injected into the battery module, the fire extinguishing water discharged to the outside of the battery module falls to a position a predetermined distance away from the outer surface of the rack case. An energy storage system as described in any one of paragraphs 1 to 8, including the one described in paragraph 1 to 8. [Section 12] The drainage guide unit is The energy storage system according to item 11, wherein the battery modules are coupled to the outer surface of the rack case at a position lower than the upper battery module and higher than the lower battery module of two adjacent battery modules located vertically. [Section 13] The drainage guide unit is The energy storage system according to item 11, wherein the rack case protrudes from the outer surface of the rack case at a predetermined angle so as to form an eaves structure. [Section 14] The drainage guide unit is The energy storage system according to item 11, rotatably coupled to the outer surface of the rack case. [Section 15] The drainage guide unit is The energy storage system according to item 14, wherein it is rotated downward and provided to form an overhang structure with respect to the storage section located below it. [Section 16] The drainage guide unit is A drainage guide plate is provided in the shape of a plate-like body that is hinged to the outer surface of the rack case, A stopper that restricts the rotation of the drainage guide plate so that the drainage guide plate forms a predetermined angle with respect to the outer surface of the rack case, An energy storage system as described in item 14, including the energy storage system described in item 14. [Section 17] The aforementioned energy storage system is A rack base that protrudes upward from the floor panel and supports the battery rack so that it is separated from the floor panel by a predetermined height, A fence surrounds the rack base at a predetermined distance from it, protrudes upward from the floor panel, and has at least one drainage hole on its side, An energy storage system as described in any one of paragraphs 1 to 8, further including the following: [Explanation of Symbols]

[0126] 10 Energy storage systems 100 containers 120 Floor plate 121 Rack installation area 123 Drainage area 130 Firefighting Water Recovery Room 140 valve unit 150 Water level sensor 160 Drainage pump 200 Battery Rack 210 Battery Modules 211 Secondary battery 212 Module Housing 217 Water supply valve 218 Fire extinguishing unit 220 Rack Case 300 aquariums 400 Fire water supply piping 500 Firefighting water recovery piping

Claims

1. Multiple battery racks, each comprising a stack of battery modules and a rack case for housing the multiple battery modules, A container provided to accommodate the aforementioned multiple battery racks inside, Includes, The aforementioned container is The system includes a floor panel on which the aforementioned plurality of battery racks are arranged in N rows, and a fire extinguishing water recovery chamber located below the floor panel, with at least one side communicating with the floor panel so that fire extinguishing water falling from the plurality of battery racks can flow into it. The plurality of battery racks are configured such that, after fire extinguishing water is supplied to the inside of the rack case, the fire extinguishing water is drained to the front or rear of the rack case and falls into the fire extinguishing water recovery chamber. The floor panel includes a rack installation area where the battery rack is installed, and a drainage area which is an open area from which fire extinguishing water can fall. The drainage area includes a central drainage area located in the center of the floor panel, in the region between the N rows of the plurality of battery racks, and a first side drainage area and a second side drainage area located on both sides of the floor panel. The fire extinguishing water recovery room is located vertically below each of the central drainage area, the first side drainage area, and the second side drainage area, and is configured to be connected to each other at the walls of the container. The aforementioned fire extinguishing water recovery room is an energy storage system having a partitioned structure in which there is no drainage channel vertically below the rack installation area.

2. The aforementioned fire extinguishing water recovery room is The energy storage system according to claim 1, wherein the bottom surface is sloped so that fire extinguishing water flowing in through the drainage area accumulates on the wall side of the container.

3. The energy storage system according to claim 2, further comprising a valve unit coupled to the wall of the container for draining the fire extinguishing water accumulated in the fire extinguishing water recovery chamber to the outside of the container.

4. The energy storage system according to claim 3, wherein a water level sensor is provided inside the fire extinguishing water recovery chamber, and the valve unit is configured to open and close based on the signal from the water level sensor.

5. The energy storage system according to claim 4, wherein a drainage pump is provided inside the fire extinguishing water recovery chamber, and the drainage pump is configured to operate based on a signal from the water level sensor.

6. The energy storage system according to claim 1, wherein the drainage area is provided in the area between rows of battery racks on the floor panel or in the area between the side wall of the container and the outermost row of battery racks.

7. The aforementioned drainage area is, The energy storage system according to claim 1, which is covered with a plate-like body with a porous structure.

8. A water tank located outside the aforementioned container, A fire extinguishing water supply pipe connecting the water tank and the battery rack, A fire water recovery piping connecting the fire water recovery room and the water tank, The energy storage system according to any one of claims 1 to 7, further comprising:

9. A water level sensor and a drainage pump are installed in the aforementioned fire extinguishing water recovery room. The energy storage system according to claim 8, wherein when the water level sensor detects that the water level in the fire extinguishing water recovery chamber has reached a certain height, the drain pump is activated and the fire extinguishing water moves to the water tank via the fire extinguishing water recovery piping.

10. The rack case is provided with a housing section that is designed to accommodate the multiple battery modules, each fitted into a predetermined height, and has a structure in which the top, bottom, left, and right sides are closed off except for the front and rear. The aforementioned battery rack is Rack connection piping connected to each of the plurality of battery modules housed in the housing for supplying firefighting water in the event of a fire, A drainage guide unit is provided on at least one of the front outer surface and rear outer surface of the rack case to guide the drainage of fire extinguishing water so that when fire extinguishing water is injected into the battery module, the fire extinguishing water discharged to the outside of the battery module falls to a position a predetermined distance away from the outer surface of the rack case. An energy storage system according to any one of claims 1 to 7, including the following:

11. The drainage guide unit is The energy storage system according to claim 10, wherein, of the two battery modules located vertically adjacent to each other, the battery module is coupled to the outer surface of the rack case at a position lower than the upper battery module and higher than the lower battery module.

12. The drainage guide unit is The energy storage system according to claim 10, wherein the structure protrudes from the outer surface of the rack case at a predetermined angle so as to form an eaves structure.

13. The drainage guide unit is The energy storage system according to claim 10, which is rotatably coupled to the outer surface of the rack case.

14. The drainage guide unit is The energy storage system according to claim 13, wherein it is rotated downwards and provided to form an overhang structure with respect to the storage section located below it.

15. The drainage guide unit is A drainage guide plate is provided in the shape of a plate-like body that is hinged to the outer surface of the rack case, A stopper that restricts the rotation of the drainage guide plate so that the drainage guide plate forms a predetermined angle with respect to the outer surface of the rack case, The energy storage system according to claim 13, including the following:

16. The aforementioned energy storage system is A rack base that protrudes upward from the floor panel and supports the battery rack so that it is separated from the floor panel by a predetermined height, A fence surrounds the rack base at a predetermined distance from it, protrudes upward from the floor panel, and has at least one drainage hole on its side, The energy storage system according to any one of claims 1 to 7, further comprising:

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