Plate-shaped fire extinguishing device and battery module equipped with same

Abstract

The plate-shaped fire extinguishing device (100) of the present invention is for extinguishing a fire by spraying a fire extinguishing agent at the location of the fire when a fire breaks out from a battery. It comprises: an outer casing (110) in the shape of a plate of a certain width, which defines a sealed chamber having a certain volume of internal space; a fire extinguishing agent (not shown) which is filled into the internal space of the chamber at a certain amount with a certain spray pressure; a number of nozzles (120) connected to the outer casing so as to communicate with the internal space of the chamber in the upper and / or lower directions; and a number of sealing covers (130) made of a low-melting-point alloy which are filled into the nozzles (120) respectively to seal the nozzles and melt when heated by the battery to a certain temperature or above, thereby spraying the fire extinguishing agent through the nozzles onto the battery.

Description

[Technical Field]

[0001] The present invention relates to a fire extinguisher, and more particularly to a plate-shaped fire extinguishing device that contains a certain volume of fire extinguishing agent at a certain pressure and is disposed in contact with or adjacent to a battery, and that sprays the contained fire extinguishing agent toward the fire site in the event of a battery fire to extinguish the fire. The present invention also relates to a battery module equipped with the plate-shaped fire extinguishing device. [Background technology]

[0002] Recently, the number of battery-powered electric vehicles has increased rapidly. However, battery fires are occurring frequently, and the occurrence of fires caused by sparks or short circuits is almost unpredictable. Therefore, it is necessary to be prepared for fires.

[0003] Electric vehicle batteries are configured with multiple battery modules, each with a large number of battery cells connected together. However, if a fire breaks out in one battery cell, the fire can quickly spread to other connected battery cells or battery modules, which is a problem.

[0004] On the other hand, an ESS (Energy Storage System) is a storage device that stores excess electricity produced at power plants and transmits it when there is a temporary power shortage. Recently, large-scale ESS devices have been made smaller and are increasingly being used in general-use facilities such as buildings, factories, and homes as a means of preparing for power outages or reducing peak power demand.

[0005] In recent years, interest in renewable energy has been increasing rapidly due to the imbalance in power supply and demand, and there has been continuous development of technology that stores electricity produced using renewable energy through ESS and uses it when needed.

[0006] In particular, the ESS market continues to grow as the installation of ESS has recently become mandatory for newly constructed public buildings and the installation of ESS in private buildings as well is increasing to save energy.

[0007] When installing an ESS in a building, the ESS's battery rack (battery module) contains batteries that store energy, a BMS that manages the batteries, a PCS that converts power, etc., and this battery rack is stored in a fixed space such as a basement and operated.

[0008] Generally, secondary batteries can be recharged and reused, and in recent years, lithium-ion batteries, which have high charge / discharge efficiency, have become increasingly popular. Because lithium-ion batteries have a relatively small volume and high charge / discharge efficiency, they are increasingly being used in not only electric vehicles and ESS, but also power plants, charging stations, and portable devices.

[0009] However, lithium-ion batteries have a thin separator between the negative and positive electrode materials, which can be damaged by impact, or can cause a short circuit between the negative and positive electrode materials due to aging or dendrite growth, resulting in fires. This can cause significant property damage in the case of large-scale equipment. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2021-0106063 [Patent Document 2] Korean Patent Registration No. 10-2123685 [Patent Document 3] Korean Patent No. 10-2185759 Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, the present invention has been developed to solve the problems of the prior art described above, and its purpose is to provide a plate-shaped fire extinguishing device that is configured in a plate shape and contains a certain volume of fire extinguishing agent at a certain pressure, is arranged in contact with or adjacent to a battery, and when a fire breaks out from the battery, the nozzle outlet is opened by heat and the contained fire extinguishing agent is sprayed at the fire site to extinguish the fire, and a battery module equipped with the same. [Means for solving the problem]

[0012] To achieve the above object, the present invention provides a plate-shaped fire extinguishing device that can extinguish a fire by spraying a fire extinguishing agent at a location where a fire occurs in a battery, the plate-shaped fire extinguishing device including: an outer casing having one or more chambers sealed to have a certain volume of internal space and configured in a plate shape of a certain width; a fire extinguishing agent that is filled into the internal space of the chamber at a certain amount and at a certain pressure; a plurality of nozzles that are disposed and connected to the outer casing so as to communicate with the internal space of the chamber in at least one direction, or that are formed integrally with the outer casing; and a plurality of sealing caps made of a low-melting point alloy that are filled inside the plurality of nozzles to seal the nozzles and melt at a certain temperature when a fire occurs in the battery, thereby spraying the fire extinguishing agent onto the battery through the nozzles, and the fire is extinguished by spraying the fire extinguishing agent at a certain spray pressure through the nozzle where the low-melting point alloy melts first.

[0013] According to the present invention, the outer shaping means includes an upper plate and a lower plate which are respectively formed along their edges and welded together along their edges to form a certain internal space, and the upper plate and the lower plate each have a plurality of formed portions which protrude inward and are formed so that their ends come into surface contact with each other when they are brought into close contact with each other, and the lower plate further has a plurality of holes which communicate with the outlets of the plurality of nozzles respectively or into which the bodies of the plurality of nozzles can be inserted and fixed, and it is preferable that the inner surfaces of the nozzle outlets are formed with taps or have tapered inclined surfaces to prevent the solid sealing covers which seal the nozzle outlets from coming off the outlets due to the ejection pressure of the fire-extinguishing agent.

[0014] Furthermore, according to the present invention, when the plurality of holes are configured to communicate with the outlets of the plurality of nozzles, respectively, it is preferable to further have a plurality of receiving grooves around the plurality of holes so that the ends of the plurality of nozzles are joined in an inserted state.

[0015] Furthermore, according to the present invention, it is preferable that the nozzle body has a stepped shape so that the nozzle body is welded and joined in a tight contact state around the hole when fitted into the hole.

[0016] According to the present invention, the outer shaping means preferably includes an upper plate and a lower plate that are formed along their respective edges and welded together along their edges to form a certain internal space, and the upper plate and the lower plate each have a plurality of formed portions that protrude inward and are formed so that their ends come into surface contact with each other when they are brought into close contact with each other. The nozzle is preferably formed integrally with the lower plate by forming a hole in a state where a portion of the lower plate protrudes further outward, and a thread tap is preferably machined on the inner surface of the nozzle to further strengthen the bonding strength between the sealing cover made of a low-melting point alloy and the inner surface of the nozzle.

[0017] According to the present invention, the constant ejection pressure of the fire extinguishing agent can be achieved by filling the internal space of the chamber with compressed air or nitrogen gas. In addition, according to the present invention, the fire extinguishing device may be configured to further include a pressure gauge for measuring the internal pressure of the chamber, or may be configured to be connected to a tank storing a separate fire extinguishing agent.

[0018] According to the present invention, the fire extinguishing agent is a fluorinated ketone (CF 12 O) or a fluorine-based ketone (FK-5-1-12, dodecafluoro-2-methylpentan-3-one), and the ejection pressure of the fire extinguishing agent is 5 to 15 kg / cm 2 It is more preferable that:

[0019] Furthermore, according to the present invention, the low melting point alloy preferably melts at a temperature of 60°C to 130°C. Also, according to the present invention, the outer shape means can be configured with a number of chambers each having an internal space sealed and partitioned from another.

[0020] In order to achieve the above object, the present invention provides a battery module including a battery having a plurality of battery cells stacked on top of each other and a case formed to enclose at least a portion of an outer surface of the battery, the battery module including a plate-shaped fire extinguishing device configured as described above, which is arranged in a form in which it is in contact with or adjacent to the battery.

[0021] Furthermore, according to the present invention, the case includes a case body capable of accommodating a battery inside and having an open side, and a case cover that opens and closes the open side of the case body, and the case cover can be configured as the plate-shaped fire extinguishing device. [Effects of the Invention]

[0022] The present invention can be easily applied to batteries because it is configured in a plate shape. When a fire breaks out in a battery and the temperature rises, the temperature of the nozzle closest to the battery where the fire has broken out rises, and the low-melting-point alloy sealing the nozzle outlet melts, opening the nozzle outlet. The fire-extinguishing agent contained in the internal space of the chamber is sprayed at a constant ejection pressure through the opened outlet toward the battery where the fire has broken out, making it easy to extinguish the fire in the battery where the fire has broken out. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view of a plate-shaped fire extinguishing device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the plate-shaped fire extinguishing device shown in FIG. [Figure 3] 3 is a cross-sectional view of the plate-shaped fire extinguishing device shown in FIG. 2 taken along line AA. [Figure 4] 3 is a cross-sectional view of the plate-shaped fire extinguishing device shown in FIG. 2 taken along line BB. [Figure 5] FIG. 2 is a bottom view of the plate-shaped fire extinguishing device shown in FIG. [Figure 6] FIG. 5 is an enlarged cross-sectional view of part C shown in FIG. 4. [Figure 7] FIG. 5 is a cross-sectional view of a modified example of the portion C shown in FIG. 4. [Figure 8] FIG. 5 is a cross-sectional view of a modified example of the portion C shown in FIG. 4. [Figure 9] FIG. 5 is a cross-sectional view of a modified example of the portion C shown in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0024] The plate-shaped fire extinguishing device of the present invention is disposed in contact with or adjacent to the battery of an electric vehicle, ESS, or the like, and is used to extinguish a fire that breaks out from the battery.

[0023] The preferred embodiments of the plate-shaped fire extinguishing device according to the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to the embodiments disclosed below, and can be embodied in various forms. The present embodiments are provided merely to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0025] 1 is a perspective view of a plate-shaped fire extinguishing device according to one embodiment of the present invention, FIG. 2 is a plan view of the plate-shaped fire extinguishing device shown in FIG. 1, FIGS. 3 and 4 are cross-sectional views of the plate-shaped fire extinguishing device shown in FIG. 2 taken along lines AA and BB, respectively, FIG. 5 is a bottom view of the plate-shaped fire extinguishing device shown in FIG. 1, FIG. 6 is an enlarged cross-sectional view of part C shown in FIG. 4, and FIGS. 7 to 9 are cross-sectional views of modified examples of part C shown in FIG. 4.

[0026] As shown in Figures 1 to 6, the plate-shaped fire extinguisher 100 of this embodiment is configured to extinguish the fire when a fire breaks out from a battery by spraying a built-in fire extinguishing agent at the location of the fire, and includes: outer means 110, which is a plate-shaped chamber of a certain width that is sealed to have an internal space of a certain volume; fire extinguishing agent (not shown) that is filled into the internal space of the chamber at a certain amount with a certain spray pressure; a number of nozzles 120 that are connected to the outer means 110 so as to communicate with the internal space of the chamber in the upper and / or lower directions; and a number of sealing covers 130 made of a low-melting point alloy that are filled to the interior of each of the multiple nozzles 120 to seal the nozzles 120 and melt when heated by the battery to a certain temperature or above, allowing the fire extinguishing agent to be sprayed onto the battery through the nozzles 100.

[0027] The exterior means 110 serves as a frame that constitutes the exterior of the plate-shaped fire extinguishing apparatus, and is composed of an upper plate 111 and a lower plate 115 that are formed along their edges and welded together along their edges to form a certain internal space. The upper plate 111 and the lower plate 115 of this embodiment are made of stainless steel, preferably STS304 material, but it is better to use thin plates with a thickness of about 0.5 to 1 t, taking into consideration the space of the battery module (including the battery rack) in which the battery is installed.

[0028] 3 and 4, the upper plate 111 and the lower plate 115 are configured to have a number of forming portions 112, 116, respectively, which are formed to protrude inward. Here, the upper plate 111 and the lower plate 115 are configured to have the same forming portions 112, 116, and when they are brought into close contact with each other, the ends of the forming portions 112, 116 come into surface contact with each other.

[0029] 6 to 8, the lower plate 115 has a plurality of holes 117 that communicate with the outlets of the nozzles 120, respectively, or into which the bodies of the nozzles 120 can be inserted and fixed. Here, the plurality of formed portions 112, 116 may be formed by a typical forming process using a thin stainless steel plate, and the plurality of holes 117 may be formed by punching. Meanwhile, as shown in FIG. 8, when the plurality of holes 117 are configured to communicate with the outlets of the nozzles 120, respectively, it is preferable to configure the lower plate 115 so that a plurality of receiving grooves 118 are formed around the plurality of holes 117 so that the ends of the plurality of nozzles 120 can be fitted and coupled from the outside. Here, the plurality of receiving grooves 118 may be formed by a typical forming process, and the plurality of holes 117 may be formed by punching out central portions of the receiving grooves 118.

[0030] 6 and 7, when the body of nozzle 120 is inserted into hole 117 and fixed, the body of nozzle 120 may be fixed by welding while fitted into hole 117. In this case, it is preferable that the body of nozzle 120 has a stepped shape so that the body of nozzle 120 can be fitted into hole 117 and fit tightly to the periphery of hole 117. In other words, the stepped portion fits tightly to the periphery of hole 117, and the fitted portion is welded to fix.

[0031] However, as shown in Figure 8, when fixing a large number of nozzles 120 with their outlets connected to holes 117, the nozzles 120 are welded together while being fitted into their respective accommodating grooves 118, with the outlets of the nozzles 120 connected to the holes 117 formed in the centers of the accommodating grooves 118 and the ends of the nozzles 120 welded together in a state where they are in close contact with the accommodating grooves 118 around the holes 117.

[0032] The outlet of the nozzle 120 is filled with a molten low-melting-point alloy, which then solidifies to form a sealing lid 130 that seals the nozzle 120. The sealing lid 130 is made of a low-melting-point alloy that melts above a certain temperature, and can be made by mixing components such as bismuth, lead, tin, indium, cadmium, and gallium. In this embodiment, the low-melting-point alloy is preferably a material that melts at 60°C to 130°C. In other words, in this embodiment, if the temperature rises to 60°C to 130°C due to a battery fire, the low-melting-point alloy melts and opens the outlet of the nozzle 120.

[0033] In this embodiment, only the lower plate 115 is configured to have a large number of nozzles 120 and sealing lids 130, but if necessary, the upper plate 111 can also be configured to have a large number of nozzles 120 and sealing lids 130 using the same concept as the lower plate 115.

[0034] In this embodiment, the plate-shaped fire extinguisher 100 has a configuration in which a certain amount of extinguishing agent is filled into the internal space of the chamber at a certain ejection pressure. Therefore, even if the low-melting-point alloy constituting the sealing lid 130 is not melted by external heat such as a fire, the ejection pressure of the extinguishing agent must not cause the sealing lid 130, which seals the outlet of the nozzle 120, to come off the outlet. Therefore, it is preferable that the inner surface of the outlet of the nozzle 120 be formed with a tap such as a screw thread (see FIG. 6) or be configured to have a tapered inclined surface (see FIG. 7). On the other hand, in the case of a tapered inclined surface as shown in FIG. 7, the inner surface, where the ejection pressure of the extinguishing agent acts, is widest and gradually narrows toward the outer surface.

[0035] Meanwhile, in the above-described embodiment, the nozzle 120 is manufactured separately and then mounted and coupled to the outer shaping means. However, as shown in FIG. 9, it can also be integrally formed with the outer shaping means. That is, when the lower plate 115 is press-formed into an embossed shape, a burring process is performed to protrude a portion of the lower plate 115 outward, forming a hole and forming the nozzle 120 integrally with the lower plate 115. In this manner, forming the nozzle 120 integrally with the lower plate 115 eliminates the need for a separate plug for manufacturing the nozzle, thereby reducing manufacturing costs and thickness. Meanwhile, as shown in FIG. 9, it is preferable to machine a threaded tap on the inner surface of the nozzle 120 to further strengthen the bonding strength between the low-melting-point alloy sealing cover 130 and the inner surface of the injection nozzle 120, thereby enabling the nozzle 120 to withstand higher injection pressures of the fire-extinguishing liquid.

[0036] The chamber of this embodiment is configured to have an internal space by welding together the edges of an upper plate 111 and a lower plate 115, which are formed along their edges, and the ends of a number of formed portions 112, 116 formed on the upper plate 111 and the lower plate 115, respectively, are welded together along the edges of the formed portions 112, 116 while being in close contact with each other, thereby forming an internal space between the upper plate 111 and the lower plate 115, while integrating them with each other. In this way, the upper plate 111 and the lower plate 115 are integrated by welding together the edges of the formed portions 112, 116, because the internal space of the chamber is maintained at a constant internal pressure (for example, 5 to 15 kg / cm 2 ) so that it can withstand such internal pressure.

[0037] Meanwhile, the internal space of the chamber is filled with a fixed amount of fire extinguishing agent to maintain a constant ejection pressure. To incorporate the fire extinguishing agent at a constant ejection pressure, the internal space of the chamber may be filled with compressed air or nitrogen gas at a constant pressure. That is, an injection port 113 communicating with the internal space of the chamber, for example, an injection port 113 is formed at one location on one side of the upper plate 111, and the internal space of the chamber is evacuated through the injection port 113. A fixed amount of fire extinguishing agent is then filled into the internal space of the chamber at the vacuum pressure, and compressed air or nitrogen gas is then filled in, so that the fire extinguishing agent expands into the internal space of the chamber and is filled at a constant ejection pressure. Therefore, when the outlet of the nozzle 120 is opened, the fire extinguishing agent is sprayed toward the battery by its own ejection pressure. Meanwhile, the fire extinguishing agent reacts with the flame to cause thermal decomposition, and the substances produced at this time have the suppression, suffocation, and cooling effects to extinguish the fire. Its ejection pressure (internal pressure) is 5 to 15 kg / cm. 2 It is preferable to incorporate the device in the internal space of the chamber so as to have the following characteristics.

[0038] When the plate-shaped fire extinguishing device 100 of this embodiment is installed in close contact with the battery, it can also function to dissipate heat generated from the battery. Therefore, it is preferable to use a fire extinguishing agent that has the property of dissipating heat generated from the battery through a repeated process of evaporation and condensation due to the heat generated from the battery. In particular, it is preferable to use a fire extinguishing agent that has the property of easily evaporating even at low temperatures because it has a cooling effect due to the latent heat of evaporation. Among these, fluorinated ketone (CF) that also has insulating properties is preferable. 12 It is more preferable to use fluorine-containing ketones such as fluorine-containing ketones (FK-5-1-12, dodecafluoro-2-methylpentan-3-one).

[0039] In this embodiment, the outer means 110 is configured with one chamber, but it may be configured with multiple chambers each having an internal space sealed and partitioned from each other. In this case, the number of chambers can be changed according to the application environment.

[0040] The plate-shaped fire extinguisher 100 of this embodiment configured as described above is capable of initial suppression of a fire that breaks out in a battery. That is, when a fire breaks out in a battery and the temperature rises, the temperature of the nozzle 120 closest to the battery where the fire has broken out rises, causing the low-melting-point alloy sealing the outlet of that nozzle 120 to melt and open the outlet of that nozzle 120. The fire extinguishing agent contained in the internal space of the chamber is sprayed through the opened outlet at a certain ejection pressure toward the battery where the fire has broken out, thereby enabling initial suppression of the fire in the battery where the fire has broken out.

[0041] Meanwhile, the plate-shaped fire extinguishing apparatus 100 of this embodiment may further include a pressure gauge 140 for measuring the pressure inside the chamber. The plate-shaped fire extinguishing apparatus 100 of this embodiment may be configured to be used in communication with a tank storing a separate extinguishing agent, thereby enabling more efficient fire suppression by spraying the extinguishing agent stored inside the chamber and in the tank toward the fire site. The tank is filled with a constant amount of extinguishing liquid to maintain the same constant pressure as the internal space of the chamber. To maintain the constant pressure of the extinguishing liquid inside the tank, the internal space of the tank may be filled with compressed air or nitrogen gas.

[0042] The plate-shaped fire extinguishing device 100 of the present embodiment configured as described above is disposed in contact with or adjacent to a battery of an electric vehicle, ESS, or the like, and is used to extinguish a fire that breaks out from the battery. Meanwhile, a battery module (including a battery rack) for an electric vehicle, ESS, or the like may include a battery having a plurality of stacked battery cells and a case formed to enclose at least a portion of the outer surface of the battery. Therefore, the battery module (including a battery rack) of the present embodiment is configured by disposing the plate-shaped fire extinguishing device 100 between the battery and the case, and the plate-shaped fire extinguishing device 100 may be disposed in contact with or adjacent to the battery. In this case, the plate-shaped fire extinguishing device 100 may be configured to be supported or fixed to the case, etc. Meanwhile, the battery module of the present embodiment can also be used as a battery pack to increase the battery capacity.

[0043] A typical battery module case is configured to include a case body with one side open that can accommodate a battery inside, and a case cover that opens and closes the open side of the case body, but it is also possible to configure the case cover as the plate-shaped fire extinguishing device 100 configured as described above.

[0044] The technical details of the plate-shaped fire extinguishing device and the battery module equipped therewith according to the present invention have been described above with reference to the accompanying drawings, which illustrate the most preferred embodiments of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications and variations should be considered to fall within the scope of the present invention. [Industrial Applicability]

[0045] The plate-shaped fire extinguishing device of the present invention is disposed in contact with or adjacent to the battery of an electric vehicle, ESS, or the like, and is used to extinguish a fire that breaks out from the battery. [Explanation of symbols]

[0046] 100 Plate-shaped fire extinguishing device 110 External form means 111 Upper Plate 112, 116 Forming section 113 Injection part 115 Lower plate 117 holes 118 Storage Groove 120 nozzles 130 Sealing lid 140 Pressure Gauge

Claims

1. A plate-shaped fire extinguishing device that can extinguish a fire by injecting a fire extinguishing agent at the location where the fire occurs in the event of a fire from a battery, an outer shape means configured as a plate having a certain width and including one or more chambers sealed to have an internal space of a certain volume; a fire extinguishing agent filled in the chamber at a constant pressure and in a constant amount; a number of nozzles disposed on and coupled to, or integrally formed with, said profile means so as to communicate in at least one direction with the interior space of said chamber; a plurality of sealing caps made of a low melting point alloy that are filled into the nozzles, respectively, to seal the nozzles and melt at a certain temperature when a fire occurs in the battery, thereby spraying the fire extinguishing agent onto the battery through the nozzles; A plate-shaped fire extinguishing device characterized in that the fire extinguishing agent is sprayed at a constant spray pressure through the nozzle in which the low-melting-point alloy is first melted, thereby extinguishing a fire.

2. the outer shaping means includes an upper plate and a lower plate that are respectively formed along their edges and welded together along their edges to form a predetermined internal space; The upper plate and the lower plate each have a plurality of forming portions that are formed by protruding inward and forming such that their ends come into surface contact with each other when they are brought into close contact with each other, the lower plate further includes a plurality of holes that communicate with the outlets of the plurality of nozzles, respectively, or into which the bodies of the plurality of nozzles can be inserted and fixed, respectively; 2. The plate-shaped fire extinguishing device according to claim 1, characterized in that the inner surface of the nozzle outlet is formed with a tap or configured to have a tapered inclined surface, thereby preventing the solid sealing cover sealing the nozzle outlet from coming off the outlet due to the ejection pressure of the fire extinguishing agent.

3. 3. The plate-shaped fire extinguishing device according to claim 2, further comprising a plurality of receiving grooves around the plurality of holes so that the ends of the plurality of nozzles can be fitted and connected when the plurality of holes are configured to communicate with the outlets of the plurality of nozzles, respectively.

4. 3. The plate-shaped fire extinguishing device according to claim 2, wherein the nozzle body has a stepped shape so that the nozzle body is welded tightly around the hole when fitted into the hole.

5. the outer shaping means includes an upper plate and a lower plate that are respectively formed along their edges and welded together along their edges to form a predetermined internal space; The upper plate and the lower plate each have a plurality of forming portions that are formed by protruding inward and forming such that their ends come into surface contact with each other when they are brought into close contact with each other, The nozzle is formed integrally with the lower plate by forming a hole with a portion of the lower plate protruding outward, 2. The plate-shaped fire extinguishing device according to claim 1, wherein the inner surface of the nozzle is provided with a thread tap to further strengthen the bonding strength between the sealing cover made of a low melting point alloy and the inner surface of the nozzle.

6. 2. The plate-shaped fire extinguishing device according to claim 1, wherein the constant ejection pressure of the fire extinguishing agent is achieved by filling the inner space of the chamber with compressed air or nitrogen gas.

7. 7. The plate-shaped fire extinguishing device according to claim 6, further comprising a pressure gauge for measuring the internal pressure of the chamber, or configured to be connected to a tank storing a separate fire extinguishing agent.

8. The fire extinguishing agent is a fluorinated ketone (C ６ F １２ O) or a fluorine-based ketone (FK-5-1-12, dodecafluoro-2-methylpentan-3-one), and the ejection pressure of the fire extinguishing agent is 5 to 15 kg / cm ２ 7. The plate-shaped fire extinguishing device according to claim 6,

9. 2. The plate-shaped fire extinguishing device according to claim 1, wherein the low-melting-point alloy melts at a temperature of 60 to 130°C.

10. 2. The plate-shaped fire extinguishing device according to claim 1, wherein said outer means is composed of a number of chambers each having an internal space sealed and partitioned from one another.

11. A battery module including a battery having a plurality of battery cells stacked on one another, and a case formed to enclose at least a portion of an outer surface of the battery, A battery module comprising the plate-shaped fire extinguishing device according to any one of claims 1 to 10, which is disposed in contact with or adjacent to the battery.

12. the case includes a case body having an opening at one side and capable of accommodating a battery therein; and a case cover for opening and closing the opening at one side of the case body, The battery module according to claim 11, wherein the case cover is configured as the plate-shaped fire extinguishing device.

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