Flat plate type fire extinguishing device and battery module equipped with same

Abstract

According to the present invention, a flat plate type fire extinguishing device (100) for extinguishing a fire by spraying a stored fire extinguishing agent to a site where the fire occurs when the fire occurs in a battery, comprises: an outer member (110) comprising a chamber sealed so as to have an internal space having a certain capacity and having a plate-like shape having a certain width; a fire extinguishing agent (not shown) filled in a certain amount in the internal space of the chamber at a certain injection pressure; a plurality of nozzles (120) coupled to the profile assembly so as to communicate with the inner space of the chamber in the upper and / or lower direction, respectively; and a plurality of seal caps (130) which are made of a low-melting-point alloy, are sealed by filling the interiors of the plurality of nozzles (120), are melted when heated to a certain temperature or higher by the battery, and eject a fire extinguishing agent into the battery through the nozzles (120).

Description

Technical Field

[0001] The present invention relates to a fire extinguishing device, and more particularly to a flat plate-type fire extinguishing device that stores a fire extinguishing agent of a certain volume and pressure inside and is arranged in a state of contact with or adjacent to a battery, so that when a fire occurs in the battery, the stored fire extinguishing agent is sprayed toward the fire occurrence site to extinguish the fire. In addition, the present invention also relates to a battery module equipped with the flat plate-type fire extinguishing device as described above. Background Art

[0002] In recent years, the number of electric vehicles using batteries has increased rapidly. In addition, battery fires occur from time to time, and fires caused by sparks or short circuits are almost unpredictable. Therefore, an effective fire countermeasure is needed.

[0003] Batteries for electric vehicles are in the form of multiple battery modules consisting of a large number of connected battery cells. If a fire occurs in one battery cell, the fire will quickly spread to other connected battery cells or battery modules.

[0004] In addition, an energy storage system (ESS) refers to a storage device that stores excess electricity produced at a power plant and transmits it when there is a temporary shortage of electricity supply. Recently, large energy storage system (ESS) devices have been miniaturized and used more and more for general consumers such as buildings, factories and homes for power outage emergencies or peak power reduction purposes.

[0005] In recent years, due to the imbalance between electricity supply and demand, people's attention to new renewable energy has increased dramatically. Therefore, people are also continuously developing technologies that can store electricity produced by new renewable energy through energy storage systems (ESS) and use it during the required time period.

[0006] In particular, the energy storage system (ESS) market is showing a continuous growth trend as newly built public buildings are required to install energy storage systems (ESS) recently and are increasingly being installed in residential buildings for the purpose of saving energy.

[0007] When installing an energy storage system (ESS) in a building, etc., the user's batteries for storing energy, the battery management system (BMS) for managing the batteries, and the power storage inverter (PCS) for converting electricity are first housed in the battery rack (battery module) of the energy storage system (ESS), and then used after the battery rack as described above is housed in a specific space such as a basement.

[0008] Generally speaking, secondary batteries can be reused after being charged, and lithium-ion batteries with high charge and discharge efficiency have been widely used in recent years. Lithium-ion batteries are increasingly used in power stations and charging stations including electric vehicles and energy storage systems (ESS) and even portable devices due to their relatively small size and relatively high charge and discharge efficiency.

[0009] However, because lithium-ion batteries have a thin separation membrane installed between the cathode material and the anode material, the separation membrane may be damaged by impact, or a short circuit may occur between the cathode material and the anode material due to aging or the growth of dendrites, resulting in a fire. This may cause serious property losses for large equipment.

[0010] Prior art literature

[0011] Patent Literature

[0012] Korean Patent Publication No. 10-2021-0106063

[0013] Korean Patent Registration No. 10-2123685

[0014] Korean Patent Registration No. 10-2185759

[0015] Detailed description of the invention

[0016] Technical issues

[0017] Therefore, the present invention is developed to solve the problems existing in the prior art described in the above content, and its purpose is to provide a flat-plate fire extinguishing device that stores a fire extinguishing agent of a certain capacity and a certain pressure inside, and is arranged in a form that is in contact with or adjacent to a battery, so that when a fire occurs in the battery, the discharge port of the nozzle is opened by means of heat and the fire is extinguished by spraying the stored fire extinguishing agent to the fire site, and a battery module equipped with the flat-plate fire extinguishing device.

[0018] Solution to the problem

[0019] In order to achieve the above-mentioned purpose, the present invention is a flat-plate fire extinguishing device for extinguishing a fire by spraying a fire extinguishing agent to a fire occurrence site when a fire occurs in a battery, and is characterized in that it includes: an outer shape component, which is formed in a plate-like form of a certain width by one or more chambers sealed in a manner of having an internal space of a certain capacity; a fire extinguishing agent, which is filled in a certain amount in the internal space of the chamber at a certain spraying pressure; a plurality of nozzles, which are arranged in a manner of being connected to the internal space of the chamber in at least one side direction and are combined with the outer shape component or formed integrally on the outer shape component; and a plurality of sealing covers, which are formed of a low-melting-point alloy (fusible alloy), are sealed by being filled into the interior of the plurality of nozzles respectively, and melt at a certain temperature when a fire occurs in the battery, and the fire extinguishing agent is sprayed into the battery through the nozzles; the fire is extinguished by spraying the fire extinguishing agent at a certain spraying pressure through the nozzles where the low-melting-point alloy melts first.

[0020] In addition, in the present invention, the outer shape component includes: an upper plate and a lower plate, which are respectively molded along the edges and are welded together along the edges to form a certain internal space; the upper and lower plates are respectively equipped with a plurality of molded parts that are molded in a manner that the ends are in surface contact with each other and protrude inward when they are tightly attached to each other, and the lower plate is also equipped with a plurality of holes that are respectively connected to the discharge ports of the plurality of nozzles or through which the main bodies of the plurality of nozzles can be respectively inserted and fixed, and it is preferable to prevent the solid sealing cover that seals the discharge port of the nozzle from detaching from the discharge port due to the injection pressure of the fire extinguishing agent by forming a tap on the inner side surface of the discharge port of the nozzle or making it have a conical inclined surface.

[0021] Furthermore, in the present invention, when the plurality of holes are respectively connected to the discharge ports of the plurality of nozzles, it is preferable to further provide a plurality of receiving grooves around the plurality of holes in order to combine the ends of the plurality of nozzles in an embedded state.

[0022] Furthermore, in the present invention, in order to allow the main body of the nozzle to be closely attached to the periphery of the hole and welded when the main body of the nozzle is inserted into the hole, it is preferable that the main body of the nozzle is configured to have a step.

[0023] In addition, in the present invention, the outer shape component includes: an upper plate and a lower plate, which are respectively molded along the edges and are welded together along the edges to form a certain internal space; the upper and lower plates are respectively equipped with a plurality of molded parts that are molded in a manner such that the ends are in surface contact with each other and protrude inwardly when they are tightly attached to each other, and the nozzle is formed integrally on the lower plate by forming a hole in a state in which a part of the lower plate is further protruded outward, and it is preferable to further strengthen the bonding force between the sealing cover of the low-melting-point alloy and the inner side surface of the nozzle by processing a tap on the inner side surface of the nozzle.

[0024] Furthermore, in the present invention, the certain injection pressure of the fire extinguishing agent can be formed by filling the inner space of the chamber with compressed air or nitrogen.

[0025] In addition, in the present invention, a pressure gauge for measuring the internal pressure of the chamber may be further provided, or the chamber may be connected to a tank storing a separate fire extinguishing agent for use.

[0026] In addition, in the present invention, the fire extinguishing agent is fluorinated ketone (C6F 12 O) or fluorinated ketone (FK-5-1-12, dodecafluoro-2-methylpentan-3-one, dodecafluoro-2-methylpentan-3-one), the injection pressure of the fire extinguishing agent is 5 to 15 kg / cm 2 It is appropriate.

[0027] Furthermore, in the present invention, it is preferred that the low melting point alloy melts at 60°C to 130°C.

[0028] Furthermore, in the present invention, the outer shell component may be composed of a plurality of chambers having respective internal spaces sealed and separated from each other.

[0029] In addition, in order to achieve the purpose as described above, the present invention is a battery module comprising a battery equipped with a plurality of battery cells stacked on each other and a shell formed in a manner that wraps at least a portion of the outer surface of the battery, characterized in that it includes: a flat-plate fire extinguishing device constructed as described above, configured in a form that is in contact with or adjacent to the battery.

[0030] Furthermore, in the present invention, the housing includes: a housing body that can accommodate the battery and has an opening on one side; and a housing cover that opens and closes the opening side of the housing body; the housing cover can be formed by the flat-type fire extinguishing device.

[0031] Effects of the Invention

[0032] The present invention can be easily applied to batteries by adopting a flat plate structure, and in the case where the temperature of the battery rises due to a fire, the temperature of the nozzle at the part closest to the battery where the fire occurred will rise, thereby causing the low-melting-point alloy sealing the discharge port of the corresponding nozzle to melt and open the discharge port of the corresponding nozzle, and the fire extinguishing agent stored in the internal space of the chamber will be sprayed toward the battery where the fire occurred through the opened discharge port at a certain spray pressure, thereby easily extinguishing the fire of the battery where the fire occurred.

[0033] Brief description of the attached figure

[0034] Figure 1 FIG. 1 is a perspective view of a flat-plate fire extinguishing device according to an embodiment of the present invention.

[0035] Figure 2 yes Figure 1 A plan view of the flat-plate type fire extinguishing device shown in FIG.

[0036] Figure 3 as well as Figure 4 Yes Figure 2 2 are cross-sectional views of the flat-plate type fire extinguishing device shown in FIG. 1 taken along line AA and line BB, respectively.

[0037] Figure 5 yes Figure 1 A bottom view of the flat-plate type fire extinguishing device shown in FIG.

[0038] Figure 6 yes Figure 4 An enlarged cross-sectional view of portion C shown in FIG.

[0039] Figures 7 to 9 yes Figure 4 sectional view of a modified example of the C portion shown in FIG.

[0040] Best Mode for Carrying Out the Invention

[0041] The flat-type fire extinguishing device of the present invention can be arranged in contact with or adjacent to a battery of an electric vehicle or an energy storage system (ESS), and can be used to extinguish a fire when a fire occurs in the battery.

[0042] Next, the preferred embodiment of the flat-plate fire extinguishing device according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments disclosed in the following content, but can be implemented in a variety of different forms. These embodiments are only for more complete disclosure of the present invention and more complete introduction of the scope of the present invention to people with general knowledge.

[0043] Figure 1is a perspective view of a flat-plate type fire extinguishing device according to one embodiment of the present invention, Figure 2 yes Figure 1 The plan view of the flat-plate type fire extinguishing device shown in FIG. Figure 3 as well as Figure 4 Yes Figure 2 The flat-plate type fire extinguishing device shown in FIG. is a cross-sectional view taken along line AA and line BB, respectively. Figure 5 yes Figure 1 The bottom view of the flat-plate type fire extinguishing device shown in FIG. Figure 6 yes Figure 4 The enlarged cross-sectional view of the C portion shown in FIG. Figures 7 to 9 yes Figure 4 sectional view of a modified example of the C portion shown in FIG.

[0044] like Figures 1 to 6 As shown, according to the flat-plate fire extinguishing device 100 of this embodiment, when a fire occurs in a battery, the fire is extinguished by spraying the stored fire extinguishing agent to the fire occurrence site, comprising: an outer shape component 110, which is formed in a plate-like form of a certain width by a chamber sealed in a manner of having an internal space of a certain capacity; a fire extinguishing agent (not shown), which is filled in a certain amount in the internal space of the chamber at a certain spraying pressure; a plurality of nozzles 120, which are combined with the outer shape component 110 in a manner of being connected to the internal space of the chamber along the upper and / or lower directions respectively; and a plurality of sealing covers 130, which are formed of a low melting point alloy, are sealed by being filled into the interior of the plurality of nozzles 120 respectively, and melt when heated by the battery to above a certain temperature and spray the fire extinguishing agent into the battery through the nozzles 120.

[0045] The outer shape assembly 110 plays the role of a frame constituting the appearance of the flat-type fire extinguishing device, etc., and includes: an upper plate 111 and a lower plate 115, which are respectively formed along the edges and are welded to each other along the edges to form a certain internal space. According to this embodiment, the upper and lower plates 111 and 115 are made of stainless steel material, specifically, STS 304 material. Considering the space for installing the battery module (including the battery rack) of the battery, it is appropriate to use a thin plate of about 0.5 to 1 t.

[0046] In addition, if Figure 3 as well as Figure 4 As shown, the upper plate 111 and the lower plate 115 are respectively provided with a plurality of molded portions 112 and 116 that are molded in a manner protruding inward. The upper and lower plates 111 and 115 are configured in a manner of being provided with the same molded portions 112 and 116, so that the ends of the molded portions 112 and 116 are in surface contact with each other when they are closely attached to each other.

[0047] In addition, if Figures 6 to 8 As shown, the lower plate 115 is provided with a plurality of holes 117 which are respectively connected to the discharge ports of the plurality of nozzles 120 or the main bodies of the nozzles 120 are respectively inserted and fixed. The plurality of forming parts 112 and 116 are formed by using a stainless steel sheet through a general forming process, and the plurality of holes 117 can be formed by only stamping. Figure 8 As shown, in the case where the plurality of holes 117 are respectively connected to the discharge ports of the plurality of nozzles 120, in order to combine the ends of the plurality of nozzles 120 in a state of being embedded from the outside, it is preferable to configure the plurality of holes 117 in a manner of having a plurality of receiving grooves 118 around the plurality of holes 117. The plurality of receiving grooves 118 are formed by a general molding process, and the plurality of holes 117 only need to be formed by stamping in the central portion of the receiving grooves 118 as described above.

[0048] In addition, if Figure 6 as well as Figure 7 As shown in the figure, when the main body of the nozzle 120 is inserted and fixed into the hole 117, it is only necessary to fix it by welding the main body of the nozzle 120 while it is embedded in the hole 117. At this time, in order to make the main body of the nozzle 120 close to the periphery of the hole 117 while it is embedded in the hole 117, it is preferable that the main body of the nozzle 120 is formed in a form with a step. That is, the step portion is close to the peripheral surface of the hole 117, and the close portion as described above can be fixed by welding.

[0049] However, if Figure 8 As shown, when the hole 117 is fixed in a state of being connected to the discharge outlets of multiple nozzles 120, the nozzle 120 is welded and fixed in a state of being embedded in each receiving groove 118. At this time, the discharge outlet of the nozzle 117 is connected to the hole 117 formed in the center of the receiving groove 118 and the end of the nozzle 120 is tightly attached to the receiving groove 118 around the hole 117.

[0050] In addition, a sealing cap 130 is formed on the discharge port of the nozzle 120, which is sealed by solidifying after being filled with a molten low-melting-point alloy. The sealing cap 130 is made of a low-melting-point alloy (fusible alloy) that can melt above a certain temperature, and can be made by mixing components such as bismuth, lead, tin, indium, cadmium, and gallium. In addition, in this embodiment, it is preferable to use a material that melts at 60°C to 130°C as the low-melting-point alloy. That is, in this embodiment, when a fire occurs on the battery and the temperature rises to 60°C to 130°C, the low-melting-point alloy will melt, thereby opening the discharge port of the nozzle 120.

[0051] In this embodiment, the plurality of nozzles 120 and the sealing cap 130 are provided only on the lower plate 115 . However, the upper plate 111 may be provided with the same plurality of nozzles 120 and the sealing cap 130 as the lower plate 115 as required.

[0052] According to the flat-type fire extinguishing device 100 of this embodiment, a certain amount of fire extinguishing agent is filled in the internal space of the chamber at a certain injection pressure. Therefore, when the low-melting-point alloy constituting the sealing cover 130 is not melted due to external heat such as fire, the sealing cover 130 that seals the discharge port of the nozzle 120 should not be separated from the discharge port due to the injection pressure of the fire extinguishing agent. Therefore, a tap similar to a thread is formed on the inner side surface of the discharge port of the nozzle 120 (see Figure 6 ) or in a manner having a tapered inclined surface (see Figure 7 ) is appropriate. In addition, if Figure 7 As shown, the tapered inclined surface may be configured such that the inner side surface subjected to the injection pressure of the fire extinguishing agent is the widest and gradually narrows toward the outer side surface.

[0053] In addition, the embodiment described in the above content is configured in a manner that the nozzle 120 is separately manufactured and then arranged and combined with the outer shape component, but Fig. 9 As shown, the nozzle 120 may be integrally formed on the outer shape component. That is, the nozzle 120 may be integrally formed on the lower plate 115 by forming a hole in a state where a portion of the lower plate 115 further protrudes outwards by a burring process during stamping as an embossed shape relative to the lower plate 115. When the nozzle 120 is integrally formed on the lower plate 115 as described above, there is no need to install a separate plug in order to manufacture a separate nozzle, thereby achieving the effect of saving manufacturing costs and reducing thickness. In addition, as Fig. 9 As shown, the joining force between the sealing cap 130 of the low melting point alloy and the inner side of the nozzle 120 is further strengthened by machining a thread tap on the inner side of the nozzle 120, so that it can withstand a higher injection pressure of the fire extinguishing agent.

[0054] According to the chamber of this embodiment, the internal space is formed by welding the upper and lower plates 111 and 115 formed along the edges to each other, and the ends of the plurality of formed parts 112 and 116 formed on the upper and lower plates 111 and 115 are welded to each other along the edges of the formed parts 112 and 116 in a state where the ends are closely attached to each other, thereby forming an internal space between the upper and lower plates 111 and 115 in a state where the upper and lower plates 111 and 115 are integrated with each other. As described above, because the internal space of the chamber has a certain internal pressure (e.g., 5 to 15 kg / cm 2), therefore, the upper and lower plates 111 and 115 are integrated by welding them together along the edges of the formed portions 112 and 116, so that they can fully withstand the internal pressure as described above.

[0055] In addition, a certain amount of fire extinguishing agent is filled in the internal space of the chamber at a certain injection pressure. At this time, in order to make the stored fire extinguishing agent have a certain injection pressure, compressed air or nitrogen can be filled into the internal space of the chamber at a certain pressure. That is, an injection portion 13 connected to the internal space of the chamber can be formed, for example, an injection portion 113 is formed at a position on one side of the upper plate 111, and a certain amount of fire extinguishing agent is filled into the internal space of the chamber by means of the vacuum pressure in the state where the internal space of the chamber is vacuumed through the injection portion 113, and then compressed air or nitrogen is filled, thereby achieving a state where the fire extinguishing agent is expanded and filled into the internal space of the chamber at a certain injection pressure. Thereby, when the discharge port of the nozzle 120 is open, the fire extinguishing agent will be sprayed toward the battery by means of its own injection pressure. In addition, the fire extinguishing agent is an agent that undergoes thermal decomposition by reacting with the flame and extinguishes the fire by means of the suppression, suffocation and cooling effects of the substances generated at this time, with a pressure of 5 to 15 kg / cm 2 It is advisable that the injection pressure (internal pressure) is filled to the internal space of the chamber.

[0056] When the flat-plate fire extinguishing device 100 according to this embodiment is installed in a state of being close to the battery, it can also play the role of dissipating the heat generated in the battery. Therefore, as a fire extinguishing agent, it is appropriate to use an agent that has the property of dissipating the heat generated in the battery by means of a repeated process of evaporation and condensation. In particular, in order to achieve the cooling effect of the latent heat of evaporation, it is appropriate to use an agent that can easily evaporate at a lower temperature as a fire extinguishing agent, especially a fluorinated ketone (C6F) that also has insulating properties. 12 O) or fluorinated ketones (FK-5-1-12, dodecafluoro-2-methylpentan-3-one, dodecafluoro-2-methylpentan-3-one) are preferred.

[0057] In this embodiment, the outer component 110 is formed by one chamber, but it can also be formed by a plurality of chambers having respective internal spaces sealed and separated from each other. In this case, the number of chambers can be arbitrarily changed according to the applicable environment.

[0058] The flat-type fire extinguishing device 100 according to the present embodiment constructed as described above can extinguish a fire in the early stage of a battery fire. That is, when the temperature of the battery rises due to a fire, the temperature of the nozzle 120 at the part closest to the battery on fire will rise, so that the low melting point alloy sealing the discharge port of the corresponding nozzle 120 will melt and the discharge port of the corresponding nozzle 120 will be opened, and the fire extinguishing agent stored in the internal space of the chamber will be sprayed toward the battery on fire through the opened discharge port at a certain spray pressure, so that the battery on fire can be extinguished at an early stage.

[0059] In addition, the flat-plate fire extinguishing device 100 according to the present embodiment may also be equipped with a pressure gauge 140 for measuring the pressure inside the chamber. In addition, the flat-plate fire extinguishing device 100 according to the present embodiment may be used in a state of being connected to a tank body storing a separate fire extinguishing agent, and the fire extinguishing agent stored inside the chamber and in the tank body may be sprayed to the fire occurrence site, thereby more effectively extinguishing the fire. Among them, the tank body adopts a structure in which a certain amount of fire extinguishing agent is filled with a certain spraying pressure that is the same as the internal space of the chamber. At this time, in order to make the stored fire extinguishing liquid have a certain pressure, compressed air or nitrogen may be filled into the internal space of the tank body.

[0060] The flat-type fire extinguishing device 100 according to the present embodiment constructed as described above will be configured in a form in contact with or adjacent to a battery such as an electric vehicle and an energy storage system (ESS), so as to be used for extinguishing a fire when a fire occurs in the battery. In addition, a battery module (including a battery rack) such as an electric vehicle and an energy storage system (ESS) may include a battery equipped with a plurality of battery cells stacked on each other and a housing formed in a manner of wrapping at least a portion of the outer side of the battery. Therefore, the battery module (including a battery rack) according to the present embodiment can be configured in a manner in which the flat-type fire extinguishing device 100 is configured between the battery and the housing, and the flat-type fire extinguishing device 100 can be configured in a form in contact with or adjacent to the battery. At this time, the flat-type fire extinguishing device 100 can be configured in a form supported or fixed by a housing or the like. In addition, the battery module according to the present embodiment can also be used as a battery pack constituting a large-capacity battery.

[0061] A general battery module casing can accommodate batteries inside and includes a casing body with an opening on one side and a casing cover for opening and closing the opening side of the casing body. The casing cover can be constructed using the flat-type fire extinguishing device 100 constructed as described above.

[0062] In the above content, technical matters related to the flat-plate fire extinguishing device and the battery module equipped with the flat-plate fire extinguishing device of the present invention are described with reference to the accompanying drawings, but this is only an exemplary description of the best embodiment of the present invention. Therefore, the present invention is not limited to the embodiments described in the above content, and a person with general knowledge in the technical field can make various modifications and variations without departing from the concept and scope of the present invention, and these variations or modifications are all included in the scope of the claims of the present invention.

[0063]

Explanation of symbols

[0064] 100: Flat-type fire extinguishing device 110: External appearance component

[0065] 111: Upper plate 112, 116: Molding part

[0066] 113: Injection part 115: Lower plate

[0067] 117: hole 118: receiving slot

[0068] 120: Nozzle 130: Sealing cap

[0069] 140: Pressure gauge

[0070] Industry availability

[0071] The flat-type fire extinguishing device of the present invention can be arranged in contact with or adjacent to a battery of an electric vehicle or an energy storage system (ESS), and can be used to extinguish a fire when a fire occurs in the battery.

Claims

1. A flat-type fire extinguishing device, characterized in that: A flat-type fire extinguishing device for extinguishing a fire by spraying a fire extinguishing agent to a fire occurrence site when a fire occurs in a battery, characterized in that it comprises: The outer shape component is formed in a plate-like form of a certain width by sealing one or more chambers in a manner of having an internal space of a certain capacity; A fire extinguishing agent is filled in a certain amount at a certain injection pressure in the inner space of the chamber; a plurality of nozzles, arranged in a manner to communicate with the internal space of the chamber in at least one direction and incorporated into the outer shape component or integrally formed on the outer shape component; and, A plurality of sealing caps, made of a fusible alloy, are respectively filled into the plurality of nozzles to seal the battery, and melt at a certain temperature when a fire occurs in the battery, and spray the fire extinguishing agent into the battery through the nozzles; The fire extinguishing agent is sprayed at a certain spraying pressure through the nozzle where the low melting point alloy melts first, thereby extinguishing the fire.

2. The flat-plate fire extinguishing device according to claim 1, characterized in that: The outer shape assembly includes: an upper plate and a lower plate, which are respectively formed along the edges and are welded together along the edges to form a certain internal space; The upper and lower plates are respectively provided with a plurality of molded parts which are molded in such a manner that the ends thereof are in surface contact with each other and protrude inwardly when they are in close contact with each other. The lower plate is also provided with a plurality of holes which are respectively connected to the discharge ports of the plurality of nozzles or into which the bodies of the plurality of nozzles can be respectively inserted and fixed. By forming a tap or a tapered inclined surface on the inner side surface of the discharge port of the nozzle, the solid sealing cap sealing the discharge port of the nozzle is prevented from being separated from the discharge port due to the injection pressure of the fire extinguishing agent.

3. The flat-plate fire extinguishing device according to claim 2, characterized in that: When the plurality of holes are configured to communicate with the discharge ports of the plurality of nozzles, respectively, a plurality of receiving grooves are further provided around the plurality of holes in order to couple the plurality of nozzles in a state where the ends of the plurality of nozzles are fitted.

4. The flat-plate fire extinguishing device according to claim 2, characterized in that: The main body of the nozzle is configured to have a step so that the main body of the nozzle can be closely attached to the periphery of the hole and welded when the main body of the nozzle is inserted into the hole.

5. The flat-plate fire extinguishing device according to claim 1, characterized in that: The outer shape assembly includes: an upper plate and a lower plate, which are respectively formed along the edges and are welded together along the edges to form a certain internal space; The upper and lower plates are respectively provided with a plurality of molded parts which are molded in such a manner that the ends thereof are in surface contact with each other and protrude inwardly when they are in close contact with each other. The nozzle is formed integrally on the lower plate by forming a hole in a state where a part of the lower plate is further protruded outward. The bonding force between the sealing cover of the low melting point alloy and the inner side surface of the nozzle is further strengthened by machining a tap on the inner side surface of the nozzle.

6. The flat-plate fire extinguishing device according to claim 1, characterized in that: The certain injection pressure of the fire extinguishing agent is formed by filling the inner space of the chamber with compressed air or nitrogen.

7. The flat-plate fire extinguishing device according to claim 6, characterized in that: A pressure gauge for measuring the internal pressure of the chamber is further provided, or the chamber is connected to a tank storing a separate fire extinguishing agent for use.

8. The flat-plate fire extinguishing device according to claim 6, characterized in that: The fire extinguishing agent is fluorinated ketone (C6F 12 O) or fluorinated ketone (FK-5-1-12, dodecafluoro-2-methylpentan-3-one, dodecafluoro-2-methylpentan-3-one), the injection pressure of the fire extinguishing agent is 5 to 15 kg / cm 2 .

9. The flat-plate fire extinguishing device according to claim 1, characterized in that: The low melting point alloy melts at 60°C to 130°C.

10. The flat-type fire extinguishing device according to claim 1, characterized in that: The outer shape assembly is composed of a plurality of chambers having respective internal spaces which are sealed and separated from each other.

11. A battery module, characterized in that: A battery module including a battery having a plurality of battery cells stacked on each other and a housing formed in a manner of wrapping at least a portion of an outer side surface of the battery includes: The invention comprises the flat-plate type fire extinguishing device according to any one of claims 1 to 10, which is arranged in contact with or adjacent to the battery.

12. The battery module according to claim 11, characterized in that: The housing includes: a housing body that can accommodate the battery and has an opening on one side; and a housing cover that opens and closes the opening side of the housing body; The outer shell cover is formed by the flat-plate type fire extinguishing device.

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