Energy Storage Systems

Abstract

The energy storage system according to the present invention includes one or more battery racks having a plurality of stacked battery modules, and a container configured to accommodate the battery racks therein, and the container may include a floor panel on which the battery racks are placed, and a fire extinguishing water recovery chamber disposed below the floor panel and having at least one side communicating with the floor panel so that fire extinguishing water dropping from the battery racks can flow into the fire extinguishing water recovery chamber.

Description

[Technical field]

[0001] The present invention relates to an energy storage system, and more particularly to an energy storage system that allows water used to suppress a fire to be collected in one place for disposal or reused for suppressing a battery fire.

[0002] This application claims priority to Korean Patent Application No. 10-2022-0054390 and Korean Patent Application No. 10-2022-0054391, filed on May 2, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] Currently, widely used secondary batteries include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. Among them, lithium secondary batteries have attracted attention due to the advantages that they can be freely charged and discharged since they hardly have a memory effect compared to nickel-based secondary batteries, and they have an extremely low self-discharge rate and high energy density.

[0004] In general, lithium secondary batteries can be broadly classified into can-type secondary batteries, in which the electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which the electrode assembly is housed in a pouch made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0005] Although a secondary battery may be used alone, in general, since a single secondary battery has a voltage of only about 2.5 V to 4.5 V, when a higher output voltage is required, a battery module is formed by connecting multiple secondary batteries in series and / or parallel to each other. The battery module may be used alone, or two or more of them may be electrically connected in series and / or parallel to each other to form a higher level device such as a battery rack or a battery pack.

[0006] Meanwhile, in recent years, as issues such as power shortages and environmentally friendly energy have come to the forefront, energy storage systems that include multiple battery racks to store off-peak power and enable use of the stored power during peak times have been attracting attention.

[0007] As an example, an industrial energy storage system includes a battery rack consisting of a rack case and numerous battery modules housed vertically in the rack case, an air conditioning device for controlling the temperature of the battery rack, and a container for providing space capable of housing the components.

[0008] Recently, as a safety measure in the event of a fire in an energy storage system, a fire extinguishing system has been introduced into the energy storage system, which is designed to inject fire extinguishing water into a specific battery module mounted on a battery rack in the event of thermal runaway of a battery cell inside the specific battery module to extinguish the fire before the heat spreads to other battery modules.

[0009] However, after fire extinguishing water is supplied into the internal space of a battery rack or container to extinguish a fire, it remains on the floor of the battery rack or container. Collecting and disposing of this water (wastewater) after supply is not an easy task, and takes a great deal of time and effort.

[0010] Meanwhile, in order to supply fire extinguishing water to the inside of the container when a fire occurs, a water tank that stores a certain amount of fire extinguishing water is arranged around the container. Since the water tank is not filled with fire extinguishing water beyond a predetermined capacity, when a fire occurs and the water tank drains, the water tank must be filled with more than a certain amount of fire extinguishing water again. However, in order to fill the water tank with fire extinguishing water, it is necessary to draw water from a water supply located close to the energy storage system to the water tank, and if this is inconvenient, there is a problem that a fire engine or the like must be called. Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been created to solve the above problems, and the technical problem that the present invention aims to solve is to provide an energy storage system equipped with a drainage structure that can easily recover and treat the fire water used to suppress a fire.

[0012] Another technical problem to be solved by the present invention is to provide an energy storage system capable of reusing the extinguishing water used to suppress a fire by recovering the extinguishing water used to suppress a fire and storing it again in the water tank.

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

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

[0015] The floor panel includes a rack installation area where the battery rack is installed, and a drainage area which is an open area through which extinguishing water can fall and in which the extinguishing water recovery chamber is located vertically below, and the extinguishing water recovery chamber can be configured so that its bottom is inclined so that the extinguishing water flowing in through the drainage area accumulates on the wall side of the container.

[0016] The fire extinguishing device may further include a valve unit coupled to a 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 provided inside the fire extinguishing water recovery chamber, and the valve unit may be configured to open and close based on a 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 a signal from the water level sensor.

[0019] The battery racks may be multiple and may be arranged in N rows on the floor panel.

[0020] The drainage areas may be provided in the areas of the floor plate between the rows of battery racks or between a side wall of the container and the outermost row of battery racks.

[0021] The drainage area may be covered by a plate of porous structure.

[0022] The fire extinguishing system may further include a water tank disposed 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] A water level sensor and a drainage pump may be provided in the extinguishing water recovery chamber, and when the water level sensor detects that the water level in the extinguishing water recovery chamber has reached a certain height, the drainage pump may be activated to move the extinguishing water to the water tank via the extinguishing water recovery piping.

[0024] The battery rack may include a rack case having a plurality of battery modules and a storage section configured to fit and store the plurality of battery modules at predetermined heights, with the storage sections being closed on all four sides except the front and rear, a rack connection pipe connected to each of the plurality of battery modules stored in the storage section for supplying extinguishing water in the event of a fire, and a drainage guide unit disposed on at least one of the front outer surface and the rear outer surface of the rack case for guiding the drainage of extinguishing water so that the extinguishing water discharged to the outside of the battery modules when the extinguishing water is poured into the battery modules falls at a position a predetermined distance away from the outer surface of the rack case.

[0025] The drainage guide unit may be coupled to an outer surface of the rack case at a position lower than an upper battery module and higher than a lower battery module of each pair of vertically adjacent battery modules.

[0026] The drainage guide unit may protrude from an outer surface of the rack case at a predetermined angle to form an eaves structure.

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

[0028] The drainage guide unit can be rotated downward to form an eave structure with respect to the storage portion located below it.

[0029] The drainage guide unit may include a drainage guide plate having a plate-like shape hinged to the outer surface of the rack case, and a stopper that limits 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.

[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 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 a side thereof. Effect of the Invention

[0031] According to the present invention, it is possible to provide an energy storage system to which a drainage structure is applied that can easily recover and treat fire extinguishing water used to suppress a fire.

[0032] In addition, according to the present invention, the water used to extinguish a fire can be collected and recharged in the water tank, making it possible to reuse the water, which has the same effect as increasing the capacity of the water tank.

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

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

[0035] The drawings attached to this specification are intended to illustrate preferred embodiments of the present invention and serve to facilitate a further understanding of the technical ideas of the present invention as well as the content of the invention, and therefore the present invention should not be interpreted as being limited to only the matters depicted in the drawings. [Brief description of the drawings]

[0036] [Figure 1] 1 is a diagram illustrating a schematic configuration of an energy storage system according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic plan view of an energy storage system according to one embodiment of the present invention. [Diagram 3] FIG. 1 is a schematic cross-sectional view of an energy storage system according to one embodiment of the present invention. [Figure 4] FIG. 2 shows a central area of ​​the floor plate of a container according to one embodiment of the present invention. [Diagram 5] FIG. 5 is a cross-sectional view of part A in FIG. [Figure 6] FIG. 2 illustrates a battery rack according to an embodiment of the present invention before a battery module is inserted into the battery rack. [Figure 7] FIG. 2 is a diagram showing a battery rack according to an embodiment of the present invention after a battery module is inserted into the battery rack. [Figure 8] FIG. 8 is a front view of the battery rack of FIG. [Figure 9] FIG. 8 is a rear view of the battery rack in FIG. 7. [Figure 10] FIG. 8 is a rear view of the battery pack of FIG. 7. [Figure 11] 2 is a diagram showing a rear view of a battery module according to an embodiment of the present invention, in which an air conditioning vent and a water supply valve are provided. FIG. [Figure 12] FIG. 12 is a partial exploded view of the battery module of FIG. [Figure 13] FIG. 12 is a schematic cross-sectional view of the battery module of FIG. [Figure 14] 11 is a diagram illustrating an example of how fire extinguishing water is supplied to and drained from a battery rack according to an embodiment of the present invention. FIG. [Figure 15] FIG. 13 is a diagram illustrating a schematic configuration of an energy storage system according to another embodiment of the present invention. [Figure 16] FIG. 2 is a schematic plan view of an energy storage system according to another embodiment of the present invention. [Figure 17] FIG. 1 is a schematic cross-sectional view of an energy storage system according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims are not to be interpreted as being limited to their ordinary or dictionary meanings, but are to be interpreted as being corresponding to the technical ideas of the present invention in accordance with the principle that the inventor can appropriately define the concept of the term himself / herself in order to best describe the invention. Therefore, it should be understood that the embodiment described in this specification and the configuration shown in the drawings are merely a preferred embodiment of the present invention and do not represent the entire technical ideas of the present invention, and therefore there may be various equivalent and modified embodiments that can be substituted therefor at the time of this application.

[0038] FIG. 1 is a diagram showing a schematic configuration of an energy storage system according to one embodiment of the present invention, FIG. 2 is a schematic plan view of an energy storage system according to one embodiment of the present invention, FIG. 3 is a schematic cross-sectional view of an energy storage system according to one embodiment of the present invention, and FIG. 4 is a diagram showing an area in the center 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 an embodiment of the present invention includes a container 100 and one or more battery racks 200 that can be accommodated inside the container 100. The container may include a floor plate 120 on which the battery racks 200 are arranged, and a fire extinguishing water recovery chamber 130 that is disposed below the floor plate 120 and has at least one side communicating with the floor plate 120 so that fire extinguishing water dropping from the battery racks 200 can flow in.

[0040] As described in more detail below, the energy storage system 10 according to one embodiment of the present invention is equipped with a fire extinguishing water recovery chamber 130 capable of collecting and treating fire extinguishing water (wastewater) used to extinguish a fire on one wall, so that the fire extinguishing water (wastewater) can be promptly treated after the fire situation has ended.

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

[0042] The battery racks 200 may be arranged in at least one direction inside the container 100. For example, as shown in FIG. 1, an energy storage system 10 according to an 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. 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, the battery racks 200 may be arranged in three or four rows, unlike the present embodiment. That is, the battery racks 200 may be arranged in N rows (N is a natural number) on the floor panel 120 inside the container 100.

[0043] In addition, the battery rack 200 according to an 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 discharged to the front or rear of the rack case 220. For example, as shown in Fig. 1, the rack case 220 may be configured to have a structure in which the top and bottom (±Z) and left and right (±X) directions are closed and only the front and rear directions (±Y) are open. With such a configuration of the rack case 220, fire extinguishing water (dirty water) used to suppress a fire can be discharged to the front or rear of the rack case 220.

[0044] As shown in Figs. 1 to 3, the container 100 includes a floor plate 120 on which a battery rack 200 is arranged, a fire extinguishing water recovery chamber 130 disposed below the floor plate 120, and walls surrounding an internal space. Here, the walls include a first wall 111, a third wall 113 facing the first wall 111 and aligned with the first wall 111, a second wall 112 intersecting the first wall 111 and having both ends connected to the first wall 111 and the third wall 113, and a fourth wall 114 facing the second wall 112, aligned with the second wall 112, and having both ends connected to the first wall 111 and the third wall 113. The container 100 is preferably made of a metal material such as steel, and may alternatively 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 an area where the battery rack 200 is installed, and the drainage area 123 is an area that is opened so that fire extinguishing water (sewage) can fall downward from the floor panel 120, and refers to an area where the fire extinguishing water recovery chamber 130 is located vertically below.

[0046] When the battery racks 200 are arranged in N rows, N rack installation areas 121 may be provided, and drainage areas 123 may be provided in the areas 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 the battery racks 200.

[0047] 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 provided at locations spaced apart from each other (in the Y direction) by a predetermined distance. Three battery racks 200 are arranged in the first rack installation area 121A along the X direction, and the other three battery racks 200 are arranged in the second rack installation area 121B along the X direction, so that six battery racks 200 are arranged in two rows of three each.

[0048] At this time, each battery rack 200 may be disposed such that the direction in which the extinguishing water is discharged, i.e., the front or rear of the rack case, faces the drainage area 123. Each battery rack 200 may be configured to be connectable to a fire extinguishing water supply pipe 400 so as to receive a supply of fire extinguishing water in an emergency. The fire extinguishing water supply pipe 400 may be connected to a water tank 300 provided outside the container 100.

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

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

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

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

[0053] In addition, the extinguishing water used to suppress the fire in the second row of battery racks 200 can be drained in the +Y direction or the -Y direction from the second row of battery racks 200. In this case, the extinguishing water drained in the +Y direction can flow into the central drainage area 123A, and the 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 plate-shaped body C1 having a porous structure (see FIG. 1). For example, by covering the drainage area 123 with a cover body having a diffraction grating structure, it is possible to allow an operator to move over the drainage area 123, i.e., the fire extinguishing water recovery chamber 130.

[0055] The extinguishing water recovery chamber 130 (see FIG. 3) can be said to be a storage space arranged below the floor panel 120 to temporarily store extinguishing water. The extinguishing water may fall from the drainage area 123 and flow into the extinguishing water recovery chamber 130. The extinguishing water recovery chamber 130 may be formed with a sloping bottom surface 131 so that the extinguishing water may accumulate on the wall surface side of the container 100. For example, the bottom surface 131 of the extinguishing water recovery chamber 130 may be formed in a sloping shape as it proceeds from the third wall surface 113 side toward the first wall surface 111 side. In this case, the extinguishing water moves along the sloping bottom surface 131, so that the extinguishing water accumulates on the first wall surface 111 side of the container 100 inside the extinguishing water recovery chamber 130.

[0056] Meanwhile, the extinguishing water recovery chamber 130 according to the present embodiment is arranged vertically below each drainage area 123 in correspondence with the above-mentioned 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 is no drainage channel in the vertically lower areas of the first rack installation area 121 and the second rack installation area 121, and the extinguishing water recovery chamber 130 is configured to be partitioned. This is to narrow the drainable passage through which the extinguishing water can move under the floor panel 120, so that the extinguishing water can move quickly and accumulate on the first wall surface 111 side. As another embodiment, in order to increase the storage capacity of the extinguishing water recovery chamber 130, the partition of the extinguishing water recovery chamber 130 may be eliminated, and the entire space under the floor panel 120 may be configured as a space for recovering the extinguishing water. Alternatively, if the battery rack 200 is configured so that fire extinguishing water is only drained from the battery rack 200 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 accordingly, the fire extinguishing water recovery chamber 130 may be configured only below the central drainage area 123A.

[0057] More specifically, referring to Figs. 3 and 4 showing the embodiment of the central drainage area 123, when the extinguishing water flows out from the first row battery rack 200 or the second row battery rack 200 in the -Y or +Y direction, it may move primarily to the central drainage area 123, and then drop downward from the central drainage area 123 and flow into the extinguishing water recovery chamber 130. The extinguishing water that flows into the extinguishing water recovery chamber 130 in this way will secondarily move toward the first wall surface 111 along the inclined bottom surface 131 of the extinguishing water recovery chamber 130. Then, the extinguishing water will accumulate on the first wall surface 111 side, and the water level of the extinguishing water will increase as it moves toward the first wall surface 111 side.

[0058] Here, the inclination of the extinguishment water recovery chamber 130 indicated by J1 in Fig. 4 may be determined within a range of, for example, 5° to 60°, taking into consideration the length of the container 100 in the X direction, etc. And, a backflow check step 132 may be provided on the bottom surface 131 of the extinguishment water recovery chamber 130. The backflow check step 132 is for preventing the backflow of the extinguishment water on the bottom surface 131 of the extinguishment water recovery chamber 130 as shown in Fig. 5, and also for preventing slipping when an operator cleans the extinguishment 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, an 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 drainage 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 means a mechanical device for blocking a flow path or controlling a flow rate. For example, the valve unit 140 may be realized by a ball valve or a gate valve. The valve unit 140 may be configured to be disposed on the wall of the container 100, i.e., on the outside of the first wall surface 111 in this embodiment, and to be connected to the extinguishing water recovery chamber 130 via a drain pipe disposed to penetrate the first wall surface 111. When the extinguishing water accumulates in the extinguishing water recovery chamber 130 to a certain amount or more, the extinguishing water may be drained outside the container 100 by opening the valve unit 140.

[0061] According to the structure of the extinguishing water recovery chamber 130 in this embodiment, the water level of the extinguishing water increases as it proceeds toward the first wall surface 111. Therefore, when the valve unit 140 is arranged below the first wall surface 111 and the valve unit 140 is opened, the difference in the water level of the extinguishing water enables the extinguishing water to be smoothly drained outside the container 100.

[0062] However, as the water level of the fire extinguishing water gradually decreases, the flow rate and flow velocity of the fire extinguishing water flowing into the valve unit 140 decreases, so it may be difficult to completely drain the fire extinguishing water in the fire extinguishing water recovery chamber 130 out of the container 100. Note that the valve unit 140 must be opened at the latest before the fire extinguishing water recovery chamber 130 is filled with the fire extinguishing water. Otherwise, the fire extinguishing water may overflow onto the floor panel 120.

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

[0064] 3, a water level sensor 150 capable of detecting the water level of the extinguishing water is provided inside the extinguishing water recovery chamber 130, and the valve unit 140 may be configured to open and close based on a 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 extinguishing water reaches a predetermined water level. In this case, the valve unit 140 may be configured to be automatically opened by the valve control unit or manually opened by an operator who detects the alarm sound.

[0065] In addition, a drainage pump 160 may be further installed inside the extinguishing 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 a predetermined water level is detected by the water level sensor 150, a signal from the water level sensor 150 is transmitted to the drainage pump 160, and an operation switch of the drainage pump 160 is turned on, so that the extinguishing water moves to a drain pipe connected to the valve unit 140.

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

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

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

[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, a rack connecting 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 accommodates 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 in parallel to each other inside the module housing 212 depending on the capacity and output required for the battery module 210.

[0071] Also, each battery module 210 may include a cooling fan 214 and an air conditioning hole 216 as means for dissipating heat generated during charging and discharging. For example, the cooling fan 214 may be provided at the front part of the module housing 212, and the air conditioning hole 216 may be provided at the rear part of the module housing 212. When the cooling fan 214 is operated, external air enters the inside of the battery module 210 through the air conditioning hole 216 at the rear part of the battery module 210, absorbs heat from the secondary battery 211, and can be discharged to the outside through the cooling fan 214 at the front part of the battery module 210. Contrary to the present embodiment, the cooling fan 214 may be provided at the rear part of the battery module 210, and the air conditioning hole 216 may be provided at the front part of the battery module 210.

[0072] Furthermore, each battery module 210 may be configured to be able to directly supply extinguishing water to the inside of the module housing 212 in preparation for a situation in which a thermal event such as thermal runaway, fire, or explosion occurs in the secondary battery 211 during charging or discharging. For example, the rack connection piping 230 may be connected to the rear surface of each battery module 210, and extinguishing water may be supplied to the battery module 210 when a thermal event occurs. This will be described in detail later.

[0073] 7, the rack case 220 may be provided in a generally rectangular parallelepiped shape so that the plurality of battery modules 210 can be inserted and housed therein at predetermined heights. The rack case 220 may be made of a rigid material so as to sufficiently protect the battery modules 210 from impact and vibration, and may be made of a metal-based material, but may also be made of a non-metallic material having excellent mechanical rigidity.

[0074] In particular, the rack case 220 according to an embodiment of the present invention includes a plurality of receiving sections 221 arranged in the vertical direction, and is configured to receive the battery modules 210 in each of the receiving sections 221. Each receiving section 221 may have a structure in which all sides (+Z, -Z, -X, +X) except for the front -Y and rear +Y are closed.

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

[0076] Furthermore, 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 when the fire extinguishing water discharged outside the battery module 210 moves to the front or rear of the rack case 220 and falls outside the rack case 220, it falls at a position a predetermined distance away from the outer surface of the rack case 220.

[0077] The drainage guide unit 240 may be protruded at a predetermined angle from the outer surface of the rack case 220 to form an eaves structure as shown in Fig. 7. Here, the eaves refer to a portion protruding outward from the outer surface of the rack case 220, and serve to protect and block the battery modules 210 in the receiving section 221 located below from fire extinguishing water falling from above. In addition, since the drainage guide unit 240 is configured in the battery rack 200 to form an eaves structure as described above, it may also serve to block vent gas or flames ejected from the battery module 210 from spreading to the battery modules 210 located above or below when the battery module 210 ignites.

[0078] 7 and 8, the drainage guide unit 240 may 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 battery modules 210 adjacent to each other in the vertical direction. That is, a plurality of drainage guide units 240 may be arranged in the vertical direction and configured to be coupled to the outer surface of the rack case 220 at each height between the upper battery module 210 and the lower battery module 210. For example, in the present embodiment, seven battery modules 210 are stacked in the vertical direction in the battery rack 200. In this case, six drainage guide units 240 may be coupled to the front outer surface 220F of the rack case 220 and six drainage guide units 240 may 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 other than the battery module 210 in question will not suffer damage from flooding due to the fire extinguishing water.

[0079] 8, when looking at the front part of the rack case 220, the drainage guide unit 240 is provided so as to partially block the front side of the open end of the front side of the accommodating part 221 located thereunder. In this case, if the battery module 210 is to be immediately inserted into the accommodating part 221 in a horizontal state, it cannot be inserted into the accommodating part 221 due to interference by the drainage guide unit 240. Needless to say, unlike this embodiment, the length of the eaves of the drainage guide unit 240 may be shortened to such an extent that the drainage guide unit 240 is not interfered with when the battery module 210 is inserted into the accommodating part 221. However, in this embodiment, the length of the eaves of the drainage guide unit 240 is elongated so that the extinguishing water is more effectively drained by the drainage guide unit 240.

[0080] In this case, there is a problem that it becomes difficult to insert the battery module 210 into the accommodating portion 221. To solve this problem, the battery rack 200 according to this embodiment is provided with the drainage guide unit 240 rotatably.

[0081] 6, before the battery module 210 is fitted into the receiving portion 221 of the rack case 220, the drainage guide unit 240 is configured to be rotated and attached to the outer surface of the rack case 220. Furthermore, the drainage guide unit 240 can be rotated upward to cover the receiving portion 221 located at the upper part of the drainage guide unit 240, and conversely, can be rotated downward to form an eaves structure with respect to the receiving portion 221 located below it, as shown in FIG.

[0082] According to the above-mentioned configuration, when the battery module 210 is accommodated in the rack case 220, for example, in the state shown in FIG. 6, the battery module 210 is first inserted into the lowest accommodation portion 221, and then the drainage guide unit 240 immediately above the lowest accommodation portion 221 is rotated to form an eaves structure. Then, the second lowest accommodation portion 221 is opened, and the battery module 210 can be inserted. At this time, the second battery module 210 is inserted into the second accommodation portion 221. By inserting the battery modules 210 in order from the lowest accommodation portion 221 to the highest accommodation portion 221 in this manner, all the battery modules 210 are accommodated in the rack case 220, and all the drainage guide units 240 form an eaves structure with respect to the outer surface of the rack case 220, as shown in FIG. 7.

[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 connected to the outer surface of the rack case 220 by a hinge 243. The drainage guide plate 241 is provided in a size that covers the upper storage section 221 when rotated upward and attached to the outer surface of the rack case 220, and may be made of any material, such as plastic or metal, as long as the material has rigidity. The drainage guide plate 241 may include a magnet 244, as shown in the enlarged view of FIG. 6, in an edge region opposite to the edge region connected to the hinge 243. 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 drain guide plate 241 attached to the outer surface of the rack case 220 is rotated downward (-Z direction) to protect the storage section 221 underneath and form a partially shielded eaves structure.

[0086] At this time, a stopper 242 can be applied to limit the rotation of the drainage guide plate 241 so that the drainage guide plate 241 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 protrusion protruding from the edge region of the drainage guide plate 241 close to the rotation axis so as to contact the outer surface of the rack case 220 at the predetermined angle θ, as shown in the enlarged view portion of Figure 7.

[0088] The shape of the protrusion is preferably a substantially right-angled triangular cross section, and can be provided so as to extend elongatedly by an amount corresponding to a length corresponding to the width of the drainage guide plate 241 in the left and right (±X directions). With such a stopper 242, the drainage guide plate 241 is rotated downward and stops when the inclined surface of the right-angled triangular shape abuts against the outer surface of the rack case 220. This enables the drainage guide plate 241 to have a protruding eaves structure that is inclined at a predetermined angle with respect 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 arranged on the front outer surface 220F of the rack case 220, as shown in FIG. 8, and a second drainage guide unit 240B arranged on the rear outer surface 220R of the rack case 220, as shown in FIG. 9 and FIG. 10.

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

[0091] That is, 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 accommodating section 221 are different from each other, the size of the first drainage guide unit 240A and the size of the second drainage guide unit 240B can be made different from each other to correspond to this.

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

[0093] The rack connection pipe 230 is a component for supplying extinguishing water to each battery module 210 in an emergency, and may be configured to be connected to the extinguishing water supply pipe 400 at one side and to pass through the rear outer surface of the rack case 220 to be connected to the battery module 210 located inside the receiving part 221. For example, as shown in FIG. 9, the rack connection pipe 230 may include a main pipe 231 disposed along the vertical direction with respect to the rack case 220 and a plurality of connection nozzles 232 branched from the main pipe 231 in an intersecting manner, and each connection nozzle 232 may be provided to pass through the outer surface of the rear of the rack case 220 and be connected to a water supply valve 217 disposed on the rear of the battery module 210. For reference, each connection nozzle 232 may be fitted into the rack case 220 through a through hole (not shown) provided on the outer surface of the rear of the rack case 220.

[0094] Next, the configuration of the battery module 210 for injecting fire-extinguishing water into the battery module 210 in the event of thermal runaway or ignition of the secondary battery 211 will be described with reference to Figs.

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

[0096] Therefore, when the battery module 210 is inserted into the receiving portion 221 of the rack case 220, the cooling fan 214 may be disposed at the front side of the rack case 220, and the air conditioning hole 216 and the water supply valve 217 may be disposed at the rear side of the rack case 220. When the battery module 210 is inserted into the receiving portion 221 of the rack case 220, the lower side of the air conditioning hole 216 may be shielded by the outer side of the rear of the rack case 220. That is, as shown by "K1" in FIG. 10, the rack case 220 may have a wall protruding from the bottom surface of each receiving portion 221 at the open end of the rear side of the each receiving portion 221. The wall serves to prevent the extinguishing water from leaking out to the rear side of the receiving portion 221. The wall is a component for guiding drainage to the front side of the rack case 220, but may be omitted when guiding drainage to both the front side and the rear side 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 therein, and may be provided in the shape of a roughly rectangular box composed 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 mutually assemblable and disassembleable, or some of the six plates may be fabricated integrally and the remaining plates may be fabricated separately so as to be partially assemblable and disassembleable.

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

[0099] The cell stack may be disposed in the module housing 212 such that the longitudinal direction of the pouch-type secondary batteries 211 intersects with the side plates 212a of the module housing 212. In other words, as shown in Fig. 12 and Fig. 13, when the directions intersecting with the stacking direction of the secondary batteries 211 are the front direction and the back direction of the cell stack, respectively, the cell stack may be disposed such that the front part and the back part face the left and right side plates 212a with a predetermined gap therebetween. In this way, by disposing the cell stack inside the module housing 212, it is possible to secure a space for air flow and a space in which the fire extinguishing unit 218 can be disposed inside the module housing 212.

[0100] As shown in FIG. 13, the fire extinguishing unit 218 may include a pipe-shaped unit body 218a and a plurality of injection nozzles 218b.

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

[0102] Although not shown in detail, each spray nozzle 218b may include a glass bulb (not shown) that is provided to open the outlet when the extinguishing water is discharged and the outlet is blocked under normal conditions and thermal damage is applied. The glass bulb may be configured to contain a predetermined liquid or gas therein and to break due to the expansion of the volume of the liquid or gas when it receives heat. With this configuration, for example, when the temperature inside the battery module 210 rises to 70°C to 200°C or more or a fire or high-temperature vent gas thermally damages the glass bulb, the material inside the glass bulb may expand and break the glass bulb, opening the outlet of the spray nozzle 218b. Then, the extinguishing water inside the unit body 218a may be discharged toward the cell stack through the outlet of the spray nozzle 218b.

[0103] Unlike the present embodiment, one end of the water supply valve 217 may be connected to the connection nozzle 232 of the rack connection pipe 230 on the outside of the rear plate 215, and the other end of the water supply valve 217, i.e., the outlet connected to the glass bulb, may be disposed on the inside of the rear plate 215. In this case, the above-mentioned fire extinguishing unit 218 may be omitted from the inside of the module housing 212.

[0104] According to the above-described fire extinguishing water supply method, fire extinguishing water can be supplied to the inside of only the battery module 210 in which a thermal event has occurred among the battery modules 210 included in the battery rack 200.

[0105] Hereinafter, with reference to FIG. 14, a mechanism will be described in which, when a thermal event occurs inside a battery module 210 and extinguishing water is supplied, and then the extinguishing water is drained to the outside, when the battery rack 200 is configured according to an embodiment of the present invention.

[0106] 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 outlet of the injection nozzle 218b inside the second battery module 210 is opened. Then, due to a pressure difference, fire extinguishing water flows from the rack connection pipe 230 into the battery module 210 through the water supply valve 217 of the second battery module 210, and is discharged from the outlet of each injection nozzle 218b while moving along the unit body 218a.

[0107] In this way, by directly injecting fire extinguishing water into the second battery module 210 where a thermal event has occurred among the multiple battery modules 210, it is possible to more quickly and effectively extinguish the fire or thermal runaway situation in the second battery module 210 at an early stage. As a result, it is possible to block the spread of the thermal runaway or flame to the other battery modules 210, and further to prevent the entire energy storage system 10 including the battery rack 200 from burning.

[0108] Meanwhile, the module housing 212 of the battery module 210 is not structured to be completely sealed. That is, there is a possibility that gaps may exist in the module housing 212 due to the air conditioning holes 216, the cooling fan 214, assembly tolerances, and the like. Therefore, the fire extinguishing water poured into the inside of the battery module 210 may leak out of the battery module 210 through such parts. If the fire extinguishing water flowing out of the battery module 210 flows into other normal battery modules 210, there is a concern that the battery module 210 may suffer serious damage from flooding.

[0109] For this reason, the battery rack 200 according to an embodiment of the present invention is configured to accommodate each battery module 210 in the accommodation portion 221 that is closed on all sides except the front and rear, as described above, so as to prevent water from flooding other normal battery modules 210. For example, even if extinguishing water leaks from the second battery module 210, the water is drained only to the front and rear sides of the rack case 220 as shown in Fig. 14. Therefore, the possibility that other normal battery modules 210 will suffer water damage is very low.

[0110] Furthermore, when the extinguishing water is drained outside the receiving portion 221 in which the second battery module 210 is located, the flow of the extinguishing water is further guided outward along the drainage guide unit 240, so that the extinguishing water may fall from a position that is 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 relatively lower drainage guide units 240 protect each battery module 210 from the extinguishing water falling from the height of the second battery module 210, the possibility that other normal battery modules 210 below the second battery module 210 will be damaged by flooding is further reduced.

[0111] Meanwhile, each battery rack 200 may be disposed so as to be fixed to an upper surface of a rack stand 125 that protrudes upward from the floor plate 120 and supports the battery rack 200 at a predetermined height from the floor plate 120. A fence 127 may be provided on the floor plate 120 of the container 100, surrounding the rack stand 125 at a predetermined distance from the rack stand 125 and having at least one drainage hole 127a.

[0112] 14, if the extinguishing water falls from the battery module, it accumulates in the space between the rack stand 125 and the fence 127, and as shown by F3 or F4, it moves along the slope formed between the rack stand 125 and the fence 127 and can be discharged outside the fence 127 through the drainage hole 127a. Here, if the water is discharged as shown by F3 and F4, it can be configured to be guided to the central drainage area 123A or the side drainage areas 123B, 123C of the floor panel 120 (see FIGS. 1 and 4).

[0113] As described above, according to the battery rack 200 according to one embodiment of the present invention, it is possible to prevent fire extinguishing water injected into a battery module 210 in which 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 those in the above-mentioned embodiment indicate the same components, and duplicated descriptions of the same components will be omitted, with the focus being on the differences from the above-mentioned embodiment.

[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 an internal space of the container 100, and a water tank 300 connected to the battery racks 200 via an extinguishing water supply pipe 400 and storing extinguishing water to be supplied to the battery racks 200 in an emergency. Here, the container 100 includes a floor plate 120 on which the battery racks 200 are arranged, and an extinguishing water recovery chamber 130 disposed below the floor plate 120 and having at least one side communicated with the floor plate 120 so that extinguishing water dropping from the battery racks 200 can flow in. Also, unlike the above-mentioned embodiment, the energy storage system according to the other embodiment of the present invention further includes an extinguishing water recovery pipe 500 connecting the extinguishing water recovery chamber 130 and the water tank 300.

[0116] According to the energy storage system 10 according to another embodiment of the present invention, the extinguishing water used to suppress the fire can be automatically collected and recharged in the water tank 300. Therefore, after the fire situation is over, there is almost no need to clean or remove the extinguishing water used to suppress the fire from inside the container 100 in order to restart the energy storage system 10, and the extinguishing water that has escaped from the water tank 300 is collected and recharged in the water tank 300, which provides an effect as if the storage capacity of the water tank 300 has been increased.

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

[0118] The water level sensor 150 and the drainage pump 160 are disposed in the fire extinguishing water recovery chamber 130, and the drainage 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 realized by a level gauge or a float switch that outputs a signal when the height of the liquid surface reaches a certain level, and the drainage pump 160 may be realized by a submersible pump that can operate underwater.

[0119] For example, when the water level in the extinguishing 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 operation switch of the drainage pump 160 is turned on, causing the drainage pump 160 to start operating and drain the extinguishing water into the extinguishing water recovery piping 500.

[0120] The extinguishing water recovery pipe 500 is installed to extend from the extinguishing water recovery chamber 130 through one side wall of the container 100, i.e., the first wall 111, to the water tank 300. Therefore, the extinguishing water can be poured into the water tank 300 through the extinguishing water recovery pipe 500 by the operation of the drainage pump 160. Meanwhile, a valve unit (not shown), such as a ball valve or a gate valve, capable of blocking the flow path or controlling the flow rate, may be disposed in the extinguishing water recovery pipe 500 to block the movement of the extinguishing water or control the flow rate.

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

[0122] Meanwhile, although not shown for ease of illustration, the energy storage system 10 may further include an air conditioning device for controlling the temperature inside the container 100, a master battery management system for integrated control of the battery racks 200, and the like.

[0123] As described above, although the present invention has been described using limited embodiments and drawings, the technical idea of ​​the present invention is in no way limited thereto, and it goes without saying that a person having ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations within the scope of the technical idea of ​​the present invention and the equivalent scope of the claims.

[0124] In this specification, terms indicating directions such as up, down, left, right, front, and rear are used, but these terms are used for convenience of explanation, and it will be obvious to a person skilled in the art of the present invention that they may differ depending on the position of the object in question, the position of the observer, etc. [Explanation of symbols]

[0125] 10 Energy Storage Systems 100 containers 120 Floor plate 121 Rack installation area 123 Drainage area 130 Fire Water Recovery Room 140 Valve unit 150 Water Level Sensor 160 Drainage Pump 200 Battery Rack 210 Battery Module 211 Secondary battery 212 Module Housing 217 Water supply valve 218 Fire extinguishing unit 220 Rack Case 300 Aquarium 400 Fire water supply piping 500 Fire water recovery piping

Claims

1. One or more battery racks in which a plurality of battery modules are stacked; A container configured to accommodate the battery rack therein; Including, The container comprises: An energy storage system comprising: a floor panel on which the battery rack is placed; and a fire extinguishing water recovery chamber disposed below the floor panel and having at least one side communicating with the floor panel so that fire extinguishing water dropping from the battery rack can flow into the fire extinguishing water recovery chamber.

2. The floor panel includes a rack installation area where the battery rack is installed, and a drainage area that is an open area through which the fire extinguishing water can fall and in which the fire extinguishing water recovery chamber is located vertically below; The fire extinguishing water recovery chamber comprises: The energy storage system of claim 1 , wherein the bottom surface is sloped so that fire water flowing through the drainage area accumulates on the wall side of the container.

3. 3. The energy storage system of claim 2, further comprising a valve unit coupled to a wall of the container for draining fire water accumulated in the fire water recovery chamber to an exterior 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 a signal from the water level sensor.

5. The energy storage system according to claim 4 , further comprising a drainage pump disposed inside the fire extinguishing water recovery chamber, the drainage pump being configured to operate based on a signal from the water level sensor.

6. The energy storage system of claim 2 , wherein the battery racks are multiple and arranged in N rows on the floor plate.

7. 7. The energy storage system of claim 6, wherein the drainage areas are disposed in areas of the floor plate between the rows of the battery racks or in areas between a side wall of the container and an outermost row of the battery racks.

8. The drainage area is The energy storage system according to claim 2 , which is covered with a plate-shaped body having a porous structure.

9. a water tank disposed outside the container; A fire extinguishing water supply pipe connecting the water tank and the battery rack; A fire extinguishing water recovery pipe connecting the fire extinguishing water recovery chamber and the water tank; The energy storage system of any one of claims 1 to 8, further comprising:

10. A water level sensor and a drainage pump are provided in the fire extinguishing water recovery chamber, The energy storage system of claim 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 to move the fire extinguishing water to the water tank through the fire extinguishing water recovery piping.

11. The battery rack comprises: A plurality of battery modules; a rack case including a storage section that is provided to be able to receive and store the plurality of battery modules at predetermined heights, and that has a structure in which all sides except the front and rear, top, bottom, left and right, are closed; a rack connection pipe connected to each of the battery modules accommodated in the accommodation section for supplying fire extinguishing water in the event of a fire; a drainage guide unit that is disposed on at least one of a front outer surface and a rear outer surface of the rack case and guides drainage of the extinguishing water so that the extinguishing water discharged to the outside of the battery module when the extinguishing water is poured into the battery module falls at a position spaced a predetermined distance from the outer surface of the rack case; The energy storage system of any one of claims 1 to 8, comprising:

12. The drainage guide unit is 12. The energy storage system according to claim 11, wherein, of each pair of vertically adjacent battery modules, a battery module located at an upper part of the rack case is coupled to an outer surface of the rack case at a position lower than that of a battery module located at an upper part of the rack case and higher than that of a battery module located at a lower part of the rack case.

13. The drainage guide unit is The energy storage system according to claim 11 , wherein the rack case is protruded from an outer surface thereof at a predetermined angle to form an eave structure.

14. The drainage guide unit is The energy storage system of claim 11 , wherein the rack case is rotatably coupled to an exterior surface of the rack case.

15. The drainage guide unit is The energy storage system according to claim 14 , wherein the storage unit is rotated downward to form an eave structure with respect to the storage unit located below the storage unit.

16. The drainage guide unit is a drainage guide plate having a plate-like shape and hinged to an outer surface of the rack case; a stopper that limits rotation of the drainage guide plate so that the drainage guide plate forms a predetermined angle with respect to an outer surface of the rack case; 15. The energy storage system of claim 14, comprising:

17. The energy storage system includes: A rack base that protrudes upward from the floor plate and supports the battery rack at a predetermined height from the floor plate; a fence surrounding the rack base at a predetermined distance from the rack base, protruding upward from the floor panel, and having at least one drainage hole on a side surface; The energy storage system of any one of claims 1 to 8, further comprising:

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