Battery pack for electric vehicles with fire extinguishing function
The battery pack design addresses the issue of fire containment in electric vehicles by using a temperature-sensitive fire extinguishing liquid distribution system to rapidly cool and absorb into affected cells, preventing thermal runaway and adjacent cell ignition.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- HTC CO LTD
- Filing Date
- 2024-09-03
- Publication Date
- 2026-06-18
AI Technical Summary
Existing battery packs in electric vehicles lack sufficient and effective means to contain and extinguish fires within battery modules, as conventional fire extinguishing devices are spatially constrained and cannot adequately contact burning cells, leading to rapid fire spread.
A battery pack design with a fire extinguishing liquid storage system that sprays extinguishing liquid directly to the affected area based on temperature sensing, using a distributed storage and nozzle system to rapidly cool and absorb into the battery cells, preventing thermal runaway and spread.
The system effectively suppresses internal thermal runaway reactions and prevents fire transfer to adjacent cells by rapidly cooling and absorbing extinguishing liquid into the affected battery cells.
Smart Images
Figure 2026519729000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a battery pack for an electric vehicle having a fire extinguishing function. More specifically, the fire extinguishing liquid stored in a fire extinguishing liquid storage container is sprayed only in the area of the battery module where a fire or abnormal sign occurs, and the fire extinguishing liquid quickly cools the battery cell or is absorbed into the inside of the battery cell to suppress the internal thermal runaway reaction and prevent the transfer to adjacent cells. The present invention relates to a battery pack for an electric vehicle having a fire extinguishing function.
Background Art
[0002] Recently, electric vehicles using batteries have been increasing rapidly. On the other hand, battery fires often occur, but the occurrence of fires due to sparks or leakage is in a situation that is almost unpredictable. Therefore, it is necessary to be prepared for fires.
[0003] An electric vehicle battery is in a form in which a large number of battery modules in which a large number of battery cells are connected are mounted. However, even if a fire occurs in one battery cell, the problem is that the fire rapidly spreads to other connected battery cells or battery modules.
[0004] Generally, secondary batteries can be charged and reused, and in recent years, many lithium-ion batteries with high charge and discharge efficiency have been used. Lithium-ion batteries are relatively small in volume and have high charge and discharge efficiency, so their use has been increasing not only in the electric vehicles and ESS but also in power plants, charging stations, and even portable devices.
[0005] However, since a thin separator is provided between the negative electrode material and the positive electrode material in a lithium-ion battery, the separator may be damaged by impact, or a short circuit may occur between the cathode material and the positive electrode material due to aging or the growth of dendrites, resulting in a fire. In the case of large-scale equipment, there is a problem that enormous property damage occurs.
[0006] On the other hand, while battery packs, including battery modules, employ air-cooling or water-cooling technologies to maintain proper cell temperatures, they cannot adequately control temperatures when thermal runaway occurs in battery cells. This can lead to a serious fire where thermal runaway transfers to adjacent cells, causing the entire battery to ignite.
[0007] Numerous prior art documents describe battery modules or packs equipped with separate fire extinguishing devices to suppress fires caused by thermal runaway in battery cells. However, due to spatial and structural constraints, these devices are limited in that they cannot contain enough extinguishing fluid to extinguish a battery cell fire. Furthermore, conventional prior art designs involve spraying a small amount of extinguishing fluid at a specific location, which is absolutely insufficient to extinguish an actual battery fire. Additionally, because the battery cells are tightly packed together, the extinguishing fluid cannot adequately contact the burning battery cell, making it prone to spreading to adjacent cells. [Overview of the Initiative] [Problems that the invention aims to solve]
[0008] Therefore, the present invention was developed to solve the problems of the prior art described above, and its purpose is to provide an electric vehicle battery pack having a fire extinguishing function, which sprays fire extinguishing liquid from a fire extinguishing liquid storage container only to the area of the battery module where a fire or abnormal signs occur, based on temperature information measured by a temperature sensing sensor, so that the fire extinguishing liquid rapidly cools the battery cells or is absorbed into the battery cells to suppress the internal thermal runaway reaction and prevent transfer to adjacent cells. [Means for solving the problem]
[0009] To achieve the above objective, the present invention provides a battery pack for electric vehicles with a fire extinguishing function, comprising: a number of battery modules, each having a temperature sensing sensor; a case housing the number of battery modules; a fire extinguishing liquid storage container disposed in the case and storing a certain capacity of fire extinguishing liquid at a certain supply pressure; and a supply means that receives the fire extinguishing liquid in the fire extinguishing liquid storage container into a pipe based on information detected by the temperature sensing sensors and supplies it to the battery module showing signs of fire or abnormality, wherein the case comprises a case body and a case cover, and the case cover comprises the number of battery modules The external means is configured such that a number of fire extinguishing liquid storage compartments are positioned on top of each battery module, and a number of open-type spray nozzles are formed on the external means so as to communicate with the number of fire extinguishing liquid storage compartments in a direction facing each battery module, wherein the external means includes one upper plate and a number of lower plates welded together to form a number of fire extinguishing liquid storage compartments, each having an internal space of a certain size, the number of spray nozzles are installed on the lower plates, and the number of fire extinguishing liquid storage compartments are connected to the number of piping.
[0010] The upper plate is formed by press-forming a plate of a certain size to form the numerous fire extinguishing liquid storage compartments, and the lower plate is formed by press-forming a plate corresponding to the size of the fire extinguishing liquid storage compartment and is added to the internal space of a certain size formed in the upper plate to form the internal space of the numerous fire extinguishing liquid storage compartments, and the numerous fire extinguishing liquid storage compartments can be formed by welding the edges of the numerous lower plates to join the upper plate and the lower plate together.
[0011] The upper plate is formed by press-forming a plate of a certain size to create a number of internal spaces of a certain size for forming the number of fire extinguishing liquid storage sections, and the lower plate is configured in a plate shape corresponding to the size of the fire extinguishing liquid storage sections. The number of fire extinguishing liquid storage sections can also be formed by welding the edges of the number of lower plates together to join the upper plate and the lower plate.
[0012] When the upper plate and the lower plate are brought into close contact with each other, it is preferable that at least one of them has a number of embossed portions welded to each other between the upper and lower plates, formed so that their ends protrude inward and make surface contact with each other within the fire extinguishing liquid storage portion.
[0013] The fire extinguishing liquid storage container is positioned near the edge of the case body, and can be integrated with the case body, or a storage space can be formed near the edge of the case body, and a separate container can be inserted and fixed into that storage space.
[0014] It is preferable to use a fire extinguishing agent having characteristic values of electrical conductivity of 10 μS / cm or less and surface tension of 30 dyne / cm (mN / m) or less as the fire extinguishing liquid. Preferably, the case body has a partition wall structure inside that is divided into many sections so that the numerous battery modules can be housed in their respective separate spaces.
[0015] Preferably, the inner surface of the fire extinguishing liquid reservoir has an embossed shape. The supply means may include a distributor connected to the fire extinguishing liquid storage container, a number of pipes connecting the distributor to the number of fire extinguishing liquid storage units, a number of valves provided inside the distributor to selectively supply fire extinguishing liquid to the number of pipes, and a control unit that controls the opening of the valves based on temperature information measured by each of the temperature sensing sensors, so that fire extinguishing liquid is supplied to the fire extinguishing liquid storage unit where the battery module experiencing a fire or abnormality is located and sprayed through the number of spray nozzles. [Effects of the Invention]
[0016] The present invention, based on temperature information measured by a temperature sensing sensor, sprays fire extinguishing liquid from a fire extinguishing liquid storage container only into the area of the battery module where a fire or abnormal signs occur. The fire extinguishing liquid rapidly cools the battery cells or is absorbed into the battery cells to suppress the internal thermal runaway reaction and prevent transfer to adjacent cells. [Brief explanation of the drawing]
[0017] [Figure 1] This is a schematic diagram showing the configuration of an electric vehicle battery pack with fire extinguishing capabilities according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view of the configuration of an electric vehicle battery pack with a fire extinguishing function according to one embodiment of the present invention. [Figure 3] Figure 1 is a perspective view showing the configuration of the case body. [Figure 4] Figure 3 is a plan view showing the battery module positioned within the partition wall of the case body. [Figure 5] Figure 1 is a top perspective view showing the configuration of the case cover. [Figure 6] Figure 1 is a lower perspective view showing the configuration of the case cover. [Figure 7] Figure 5 is a cross-sectional perspective view showing a portion of the case cover shown. [Figure 8]It is a side view showing a cut-out part of the case cover shown in FIG. 5. [Figure 9] It is a conceptual diagram showing the configuration relationship of the supply means shown in FIG. 1.
Mode for Carrying Out the Invention
[0018] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms or words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventor should conform to the principle that he can appropriately define the concept of the terms in order to explain his invention in the best way, and they should be construed in a meaning and concept consistent with the technical idea of the present invention. Also, in the technical terms and scientific terms used, unless otherwise defined, they have the meanings usually understood by those having ordinary knowledge in the technical field to which the present invention pertains. In the following description and the accompanying drawings, descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted. The accompanying drawings are provided as examples to sufficiently convey the idea of the present invention to those skilled in the art. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms. Note that throughout the specification, the same reference numerals represent the same components. It should be noted that the same components in the drawings are represented by the same reference numerals as much as possible everywhere.
[0019] The battery pack for an electric vehicle having a fire extinguishing function according to the present invention is configured to suppress a fire or prevent a fire from occurring by injecting the fire extinguishing liquid in the fire extinguishing liquid storage container only into the area of the battery module where a fire or an abnormal sign occurs based on the temperature information measured by the temperature detection sensor.
[0020] FIG. 1 and FIG. 2 are a schematic view and a cross-sectional view respectively showing the configuration relationship of a battery pack for an electric vehicle having a fire extinguishing function according to an embodiment of the present invention, FIG. 3 is a perspective view showing the configuration relationship of the case body shown in FIG. 1, and FIG. 4 is a plan view of a state in which battery modules are arranged in the partition wall of the case body shown in FIG. 3.
[0021] As shown in FIGS. 1 to 4, the battery pack according to the present embodiment includes a plurality of battery modules 100 each having a temperature detection sensor (not shown), a case 200 for housing the plurality of battery modules 100, a fire extinguishing liquid storage container 300 disposed in the case 200 and storing a fire extinguishing liquid of a certain capacity at a certain supply pressure, and a supply means 400 for supplying the fire extinguishing liquid in the fire extinguishing liquid storage container 300 to a battery module where a fire or an abnormal sign occurs based on the information detected by the temperature detection sensor.
[0022] The battery module 100 is a member that generates electrochemical energy by the movement of ions or electrons and can be arranged in a large number inside the case 200. Here, the battery modules 100 can be arranged in a large number of rows and columns inside the case 200 (see FIG. 4). Also, as shown in FIG. 4, one battery module 100 can include a large number of stacked battery cells 110, and each battery cell 110 can include a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate. Further, the battery module 100 can be provided with a protection circuit module provided for each battery cell 110, or a protection circuit module integrally connected to a large number of battery cells, and the protection circuit module can control the voltage or current during charging and discharging of the battery cell 110. Also, in each battery cell 110, an electrode tab can be drawn out, and the electrode assembly can include all known forms such as a laminated type or a wound type.
[0023] The case 200 accommodates a number of battery modules 100, preferably a component that houses each battery module in its own isolated space, and may include a case body 220 and a case cover 210. Here, the case body 220 can accommodate a number of battery modules 100 inside, has a box shape with one side open, and can be configured to have a partition wall structure inside that is divided into a number of sections so that a number of battery modules 100 can be housed in their respective isolated spaces (see Figures 3 and 4). Therefore, the fire extinguishing liquid is filled only into the isolated space of the battery module 100 that has ignited, and can immerse the liquid up to the height of all or part of the battery module 100 there (see Figure 1). On the other hand, the partition wall 221 of the case body 220 can be constructed at a height lower than the edge of the case body 220. In such a case, the fire extinguishing liquid can be temporarily filled into the isolation space of the ignited battery module 100 to extinguish the fire, and if it overflows beyond the partition wall 221, it can be filled into the isolation space of the adjacent battery module 100 to prevent the spread of flames and heat to adjacent cells.
[0024] The case cover 210 can open and close one open side of the case body 220. Therefore, when the case cover 210 is closed relative to the case body 220, the inside of the case 200 can be protected from the external environment.
[0025] Furthermore, the case cover 210 is configured to simultaneously have the function of sealing the inside of the case body 220 and the function of suppressing or preventing fires caused by thermal runaway by spraying the fire extinguishing liquid stored in the fire extinguishing liquid storage container 300 only into the area of the battery module 100 where a fire or abnormal signs occur. In other words, the case cover 210 is configured in a plate shape and is configured to effectively suppress the fire by concentrating a large amount of fire extinguishing liquid into the battery when abnormal signs or thermal runaway occur in a specific cell or module, and to prevent the fire from spreading to adjacent cells.
[0026] Figures 5 and 6 are upper and lower perspective views showing the structural relationship of the case cover shown in Figure 1, while Figures 7 and 8 are a cross-sectional perspective view and a side view showing a portion of the case cover shown in Figure 5.
[0027] As shown in Figures 1, 5 to 8, the case cover 210 is configured as an external shape means 211 which is a plate of a certain width such that a number of fire extinguishing liquid storage sections 213 equal to the number of battery modules 100 are positioned on top of each battery module 100, and a number of open-type spray nozzles 215 formed on the external shape means 211 which communicate with the number of fire extinguishing liquid storage sections 213 in the direction facing each battery module 100.
[0028] The aforementioned external shaping means 211 serves as a frame that constitutes the exterior appearance of the case cover 210. It is press-formed to form a number of divided fire extinguishing liquid storage sections 213, and is welded to each other along the edges of the fire extinguishing liquid storage sections 213. It consists of an upper plate 212 and a number of lower plates 214 that form a number of fire extinguishing liquid storage sections 213, each having a certain internal space. In this embodiment, the upper plate 212 and lower plate 214 are made of a metal material such as stainless steel or aluminum, but it is preferable that their thickness is between 0.2 and 1.0 mm considering rigidity and weight reduction. On the other hand, the total thickness of the case cover 210 is preferably between 3 and 10 mm considering the capacity of the fire extinguishing liquid, the vehicle structure, and the weight.
[0029] Specifically, the upper plate 212 is constructed by press-forming a plate of a certain size to have a number of internal spaces of a certain size for forming a number of fire extinguishing liquid storage sections 213, and the lower plate 214 is constructed by press-forming a plate corresponding to the size of the fire extinguishing liquid storage section 213 and adding it to the internal spaces of a certain size formed in the upper plate 212 to form the internal spaces of the fire extinguishing liquid storage sections 213. The lower plate 214 has a number of holes drilled for arranging and installing a number of spray nozzles 215. A number of these lower plates 214 are arranged so as to cover the internal spaces of a certain size in the upper plate 212, and the edges of the multiple lower plates 214 are welded together to join the upper plate 212 and the lower plate 214, thereby forming a number of fire extinguishing liquid storage sections 213.
[0030] On the other hand, when the upper plate 212 and the lower plate 214 are press-formed to be flat, the inner upper and inner lower surfaces of the fire extinguishing liquid storage section 213 have a smooth, flat shape. However, when the upper plate 212 and the lower plate 214 are press-formed to have an embossed shape that protrudes inward, as shown in Figures 7 and 8, the inner upper and lower surfaces of the fire extinguishing liquid storage section 213 have a number of embossed portions 216 and 217, respectively. Here, the upper plate 212 and the lower plate 214 are configured to have the same embossed portions 216 and 217, and when they are brought into close contact with each other, the ends of the embossed portions 216 and 217 make surface contact with each other. Therefore, by welding the edges of each lower plate 214 to the upper plate 212, each fire extinguishing liquid storage section 213 is formed, and by welding the embossed sections 216 and 217 that are in close contact with each other, it is possible to ensure the rigidity of the fire extinguishing liquid storage section 213 so as not to expand and deform due to the high-pressure fire extinguishing liquid inside.
[0031] In this embodiment, the external shaping means 211 can also be configured to have numerous fire extinguishing liquid storage sections 213 by welding together press-formed upper and lower plates that are stacked on top of each other. However, when using separate upper and lower plates, the overall weight of the external shaping means 211 increases due to the unnecessary parts not used to form the fire extinguishing liquid storage sections 213. Furthermore, welding the large upper and lower plates together requires long welding lines and many welding points, resulting in poor handling and workability during the manufacturing process, as well as a decrease in yield. In particular, hundreds of spray nozzles must be welded to the lower plate, and even if a welding defect occurs in a single spray nozzle, the entire lower plate must be discarded, which is another drawback.
[0032] However, the external shaping means 211 of this embodiment is composed of one upper plate 212 as described above and a number of lower plates 214 equal to the number of fire extinguishing liquid storage sections 213. By removing unnecessary parts not used to form the fire extinguishing liquid storage sections 213, the overall weight of the external shaping means 211 is reduced. Furthermore, general welding work is possible to join the upper plate 212 and the lower plates 214 together by welding the edges of the numerous lower plates 214 to form the respective fire extinguishing liquid storage sections 213, thus improving workability. In addition, spray nozzles 215 can be attached to individual lower plates 214 in a separate process, and after a leak test, each lower plate 214 can be quickly welded to the upper plate 212 in the joining process.
[0033] On the other hand, in this embodiment, the upper plate 212 and the lower plate 214 are constructed by press forming to provide space for forming the fire extinguishing liquid storage section 213. However, it is also possible to press form only the upper plate 212 and construct the lower plate 214 as a flat plate without press forming. When only the upper plate 212 is press formed in this way, the internal space of the fire extinguishing liquid storage section 213 may become narrower. Taking this into consideration, the depth of the press forming can be increased to enlarge the internal space. In this case, since only the upper plate 212 has an embossed portion 216, by welding the embossed portion 216 to the lower plate 214 while the embossed portion 216 is in close contact with the inner surface of the lower plate 214, it is possible to ensure rigidity that prevents expansion deformation of the fire extinguishing liquid storage section 213 due to the high pressure of the fire extinguishing liquid inside.
[0034] The spray nozzles 215 are open-type nozzles facing each battery module 100 and are positioned in a number of holes formed in the lower plate 214 so as to communicate with each fire extinguishing liquid storage section 213.
[0035] On the other hand, the injection nozzle 215 can also be formed by creating a hole in the lower plate 214 during press forming by a burring process, causing a portion of the lower plate 214 to protrude further outwards, and using that hole as the injection nozzle 215. In other words, by integrating the injection nozzle 215 with the lower plate 214 without attaching a separate plug for nozzle manufacturing, it is possible to reduce manufacturing costs and achieve a reduction in thickness.
[0036] As shown in Figures 1 and 2, the fire extinguishing liquid storage container 300 stores a certain volume of fire extinguishing liquid at a constant discharge pressure. However, if a fire or abnormality occurs in the battery, the fire extinguishing liquid is supplied only to the area of the battery module, and is connected to one side of the fire extinguishing liquid storage section 213 of the case cover 210 via piping 420 through a distributor 410 (described later).
[0037] On the other hand, the fire extinguishing liquid storage container 300 is positioned near the edge of the case body 220 and can be integrated with the case body 220, or a storage space can be formed near the edge of the case body 220, and a separate container can be inserted and fixed into that storage space. Such a fire extinguishing liquid storage container 300 is preferably positioned in a manner that makes maximum use of the area near the edge of the case body 220, taking into consideration the structure of the case 200 that is positioned and fixed in the electric vehicle, and the storage space for the numerous battery modules 100 housed inside the case body 220. For example, the fire extinguishing liquid storage container 300 can be positioned on both side edges of the case body 220, as shown in Figures 1 and 2.
[0038] The fire extinguishing liquid storage container 300 has a structure in which a certain volume of fire extinguishing liquid is filled inside the container so as to have a constant ejection pressure. In this case, in order to store the fire extinguishing liquid so as to have a constant ejection pressure, the internal space of the container may be filled with a pressurized gas that does not cause combustion reactions (for example, nitrogen or carbon dioxide at 5 to 10 bar (0.5 to 1 MPa)). On the other hand, as the fire extinguishing liquid, a cooling fire extinguishing agent having insulating and penetrating properties can be used, but it is preferable to use a fire extinguishing agent that is based on water with high latent heat of vaporization and has characteristic values of electrical conductivity of 10 μS / cm or less and surface tension of 30 dyne / cm or less. Here, if the electrical conductivity exceeds 10 μS / cm, there is a risk of electrical short circuits occurring at the battery terminals and cell electrodes, which may cause additional thermal runaway reactions, and if the surface tension exceeds 30 dyne / cm, there is a disadvantage that the penetrating and wettability will decrease, delaying the cooling and fire extinguishing reaction to the depths of the cell, so it is preferable to use a fire extinguishing agent that satisfies the above conditions.
[0039] Figure 9 is a conceptual diagram showing the configuration of the supply means shown in Figure 1. As shown in Figures 1 and 9, the supply means 400 concentrates the supply of fire extinguishing liquid from the fire extinguishing liquid storage container 300 only to the area of the battery module 100 where a fire or abnormal signs occur, based on temperature information measured by a temperature sensing sensor. The supply means 400 includes a distributor 410 connected to the fire extinguishing liquid storage container 300, a number of pipes 420 connecting the distributor 410 to a number of fire extinguishing liquid storage units 213, a number of valves 430 installed inside the distributor 410 so as to be able to selectively supply fire extinguishing liquid to the number of pipes 420, and a control unit (not shown) that controls the opening of the valves 430 so as to supply fire extinguishing liquid to the fire extinguishing liquid storage unit 213 where the battery module 100 where a fire or abnormal signs (exceeding the battery operating temperature limit or the rate of temperature increase per hour) occurs is located, and sprays it through a number of spray nozzles 215, based on temperature information measured by each temperature sensing sensor.
[0040] In this embodiment, the fire extinguishing liquid storage section 213 of the case cover 210 is divided into six sections, resulting in six pipes 420 and valves 430. However, it is possible to configure more or fewer as needed. On the other hand, it is preferable that the valves 430 in this embodiment be electromagnetic solenoid valves.
[0041] On the other hand, the battery pack of this embodiment is configured to have a vent valve (not shown) in the case body 220, similar to a general battery pack, so that when a fire occurs in the battery, the vent valve opens, allowing for the smooth spraying of fire extinguishing liquid without being affected by the internal pressure of the case 200.
[0042] As described above, the battery pack of this embodiment, based on temperature information measured by a temperature sensing sensor, concentrates the fire extinguishing liquid from the fire extinguishing liquid storage container 300 only in the area of the battery module 100 where a fire or abnormal signs occur, so that part or all of the battery is immersed in the fire extinguishing liquid. This allows the fire extinguishing liquid to be absorbed into the battery cells, suppressing the internal thermal runaway reaction and preventing transfer to adjacent cells. Furthermore, if the fire extinguishing liquid overflows beyond the partition wall 221 of the battery module 100 where the fire occurred, it can also fill the separation space of the adjacent battery module 100, preventing the propagation of flames and heat to adjacent cells.
[0043] The technical details of the electric vehicle battery pack having a fire extinguishing function of the present invention have been described above with reference to the attached drawings, but this is merely an illustrative description of preferred embodiments of the present invention. Therefore, the present invention is not limited to the embodiments described above, and it is obvious to those with ordinary skill in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention, and such modifications or variations should also be considered to fall within the scope of the claims of the present invention. [Industrial applicability]
[0044] This invention can be applied to electric vehicles and used to suppress fires that occur in the battery.
Claims
1. The system includes a number of battery modules, each having a temperature sensing sensor; a case housing the number of battery modules; a fire extinguishing liquid storage container arranged in the case and storing a certain volume of fire extinguishing liquid at a certain supply pressure; and a supply means that, based on information detected by the temperature sensing sensors, receives the fire extinguishing liquid from the fire extinguishing liquid storage container into a pipe and supplies it to the battery module that is showing signs of fire or abnormality. The aforementioned case includes a case body and a case cover, The case cover includes an external shape configured such that a number of fire extinguishing liquid storage compartments equal to the number of battery modules are positioned on top of each battery module, and a number of open-type spray nozzles formed on the external shape so as to communicate with the number of fire extinguishing liquid storage compartments in a direction facing each battery module. The external means includes one upper plate and a number of lower plates, which are welded together to form a number of fire extinguishing liquid storage sections, each having an internal space of a certain size. The numerous spray nozzles are installed on the lower plate, and the numerous fire extinguishing liquid storage sections are connected to the piping. A battery pack for an electric vehicle having a fire-fighting function, characterized in that the upper plate and the lower plate are formed to protrude inward so that when they are in close contact with each other, their ends make surface contact with each other within the fire-fighting liquid storage portion, and at least one of them is provided with a number of embossed portions welded to each other between the upper and lower plates.
2. The electric vehicle battery pack having a fire extinguishing function according to claim 1, characterized in that the fire extinguishing liquid storage container is arranged near the edge of the case body.
3. The electric vehicle battery pack having a fire extinguishing function according to claim 2, characterized in that the fire extinguishing liquid storage container is integrated with the case body, or a storage space is formed near the edge of the case body and a separate container is inserted and fixed into the storage space.
4. The electric vehicle battery pack having a fire extinguishing function according to claim 1, characterized in that the fire extinguishing liquid uses a fire extinguishing agent having characteristic values of electrical conductivity of 10 μS / cm or less and surface tension of 30 dyne / cm or less.
5. The battery pack for an electric vehicle having a fire extinguishing function according to claim 1, characterized in that the case body has a partition structure inside which it is divided into a number of areas so that the number of battery modules can each be housed in their respective separate spaces.
6. The supply means comprises a distributor connected to the fire extinguishing liquid storage container, a plurality of pipes connecting the distributor to the plurality of fire extinguishing liquid storage units, a plurality of valves installed inside the distributor so as to be able to selectively supply fire extinguishing liquid to the plurality of pipes, and a control unit that controls the valves to open so as to be able to supply fire extinguishing liquid to the fire extinguishing liquid storage unit where the battery module in which a fire or abnormality occurs is located and spray it through a plurality of spray nozzles, as described in claim 1.
7. The system includes a number of battery modules, each having a temperature sensing sensor; a case housing the number of battery modules; a fire extinguishing liquid storage container arranged in the case and storing a certain volume of fire extinguishing liquid at a certain supply pressure; and a supply means that receives the fire extinguishing liquid from the fire extinguishing liquid storage container into the piping based on information detected by the temperature sensing sensors and supplies it to the battery module that is experiencing a fire or abnormality. The aforementioned case includes a case body and a case cover, The case cover includes an external shape configured such that a number of fire extinguishing liquid storage compartments equal to the number of battery modules are positioned on top of each battery module, and a number of open-type spray nozzles formed on the external shape so as to communicate with the number of fire extinguishing liquid storage compartments in a direction facing each battery module. The external means includes one upper plate and a number of lower plates, which are welded together to form a number of fire extinguishing liquid storage sections, each having an internal space of a certain size. The numerous spray nozzles are installed on the lower plate, and the numerous fire extinguishing liquid storage sections are connected to the piping. The upper plate is provided with numerous internal spaces of a certain size for forming the numerous fire extinguishing liquid storage sections by press-forming a plate of a certain size, The lower plate is formed by press-forming a plate corresponding to the size of the fire extinguishing liquid storage section, and is added to the internal space of a certain size formed in the upper plate to form internal spaces for the numerous fire extinguishing liquid storage sections, each having an internal section of a certain size. A battery pack for an electric vehicle having a fire-fighting function, characterized in that the numerous fire-fighting liquid storage compartments are formed by welding the edges of the numerous lower plates together to connect the upper plate and the lower plate.
8. The electric vehicle battery pack having a fire extinguishing function according to claim 7, characterized in that the fire extinguishing liquid storage container is arranged near the edge of the case body.
9. The electric vehicle battery pack having a fire extinguishing function according to claim 8, characterized in that the fire extinguishing liquid storage container is integrated with the case body, or a storage space is formed near the edge of the case body and a separate container is inserted and fixed into the storage space.
10. The electric vehicle battery pack having a fire extinguishing function according to claim 7, characterized in that the fire extinguishing liquid uses a fire extinguishing agent having characteristic values of electrical conductivity of 10 μS / cm or less and surface tension of 30 dyne / cm or less.
11. The battery pack for an electric vehicle having a fire extinguishing function according to claim 7, characterized in that the case body has a partition structure inside which it is divided into a number of areas so that the number of battery modules can each be housed in their respective separate spaces.
12. The supply means comprises a distributor connected to the fire extinguishing liquid storage container, a plurality of pipes connecting the distributor to the plurality of fire extinguishing liquid storage units, a plurality of valves installed inside the distributor so as to be able to selectively supply fire extinguishing liquid to the plurality of pipes, and a control unit that controls the valves to open so as to be able to supply fire extinguishing liquid to the fire extinguishing liquid storage unit where the battery module in which a fire or abnormality occurs is located and spray it through a plurality of spray nozzles, as described in claim 7.
13. The system includes a number of battery modules, each having a temperature sensing sensor; a case housing the number of battery modules; a fire extinguishing liquid storage container arranged in the case and storing a certain volume of fire extinguishing liquid at a certain supply pressure; and a supply means that, based on information detected by the temperature sensing sensors, receives the fire extinguishing liquid from the fire extinguishing liquid storage container into a pipe and supplies it to the battery module where a fire or abnormality is detected. The aforementioned case includes a case body and a case cover, The case cover includes an external shape configured such that a number of fire extinguishing liquid storage compartments equal to the number of battery modules are positioned on top of each battery module, and a number of open-type spray nozzles formed on the external shape so as to communicate with the number of fire extinguishing liquid storage compartments in a direction facing each battery module. The external means includes one upper plate and a number of lower plates, which are welded together to form a number of fire extinguishing liquid storage sections, each having an internal space of a certain size. The numerous spray nozzles are installed on the lower plate, and the numerous fire extinguishing liquid storage sections are connected to the piping. The upper plate is provided with numerous internal spaces of a certain size for forming the numerous fire extinguishing liquid storage sections by press-forming a plate of a certain size, The lower plate is configured in a plate shape corresponding to the size of the fire extinguishing liquid storage section. A battery pack for an electric vehicle having a fire-fighting function, characterized in that the numerous fire-fighting liquid storage compartments are formed by welding the edges of the numerous lower plates together to connect the upper plate and the lower plate.
14. The electric vehicle battery pack having a fire extinguishing function according to claim 13, characterized in that the fire extinguishing liquid storage container is arranged near the edge of the case body.
15. The electric vehicle battery pack having a fire extinguishing function according to claim 14, characterized in that the fire extinguishing liquid storage container is integrated with the case body, or a storage space is formed near the edge of the case body and a separate container is inserted and fixed into the storage space.
16. The electric vehicle battery pack having a fire extinguishing function according to claim 13, characterized in that the fire extinguishing liquid uses a fire extinguishing agent having characteristic values of electrical conductivity of 10 μS / cm or less and surface tension of 30 dyne / cm or less.
17. The battery pack for an electric vehicle having a fire extinguishing function according to claim 13, characterized in that the case body has a partition structure inside which it is divided into a number of areas so that the number of battery modules can each be housed in their respective separate spaces.
18. The supply means comprises a distributor connected to the fire extinguishing liquid storage container, a plurality of pipes connecting the distributor to the plurality of fire extinguishing liquid storage units, a plurality of valves installed inside the distributor so as to be able to selectively supply fire extinguishing liquid to the plurality of pipes, and a control unit that controls the valves to open so as to be able to supply fire extinguishing liquid to the fire extinguishing liquid storage unit where the battery module in which a fire or abnormality occurs is located and spray it through a plurality of spray nozzles, as described in claim 13.