Battery pack for electric vehicles having fire extinguishing function

Abstract

A battery pack for electric vehicles, having a fire extinguishing function, according to this invention, comprises: a plurality of battery modules (100) respectively having temperature sensors; a case (200) that accommodates the plurality of battery modules (100); a fire extinguishing liquid storage container (300) that is arranged in the case (200) and stores a certain capacity of fire extinguishing liquid at a constant supply pressure; and a supply means (400) that supplies, to a battery module where fire occurs or abnormal symptoms are detected, the fire extinguishing liquid in the fire extinguishing liquid storage container (300) on the basis of information detected by the temperature sensors. The battery pack of this invention sprays, only to an area of the battery module where fire occurs or abnormal symptoms are detected, the fire extinguishing liquid stored in the fire extinguishing liquid storage container on the basis of temperature information obtained through measurement via the temperature sensors, such that the fire extinguishing liquid can quickly cool battery cells or be absorbed into the interior of the battery cells to suppress internal thermal runaway reactions and prevent transition to adjacent cells.

Description

Battery pack for electric vehicles with digestive function

[0001] This invention relates to a battery pack for an electric vehicle having a fire extinguishing function, and more particularly, to a battery pack for an electric vehicle having a fire extinguishing function that sprays a fire extinguishing agent stored in a fire extinguishing agent storage container only to a battery module area where a fire or an abnormality occurs, so that the fire extinguishing agent quickly cools a battery cell or is absorbed into the interior of the battery cell to suppress an internal thermal runaway reaction and prevent it from spreading to an adjacent cell.

[0002] Recently, battery-powered electric vehicles have been rapidly increasing in popularity. Meanwhile, battery fires are occurring frequently, and fires caused by sparks or electrical leakage are nearly unpredictable. Therefore, fire preparedness is essential.

[0003] Electric vehicle batteries are equipped with multiple battery modules in which multiple battery cells are connected. The problem is that even if a fire breaks out in one battery cell, the fire quickly spreads to other connected battery cells or battery modules.

[0004] Secondary batteries are generally rechargeable and reusable. Recently, lithium-ion batteries, with their high charge-discharge efficiency, have become increasingly popular. Due to their relatively small size and high charge-discharge efficiency, lithium-ion batteries are increasingly being used in applications such as electric vehicles and ESS, as well as power plants, charging stations, and even portable devices.

[0005] However, since lithium-ion batteries have a thin separator installed between the anode and cathode materials, fire can occur when the separator is damaged by impact, or when a short circuit occurs between the anode and cathode materials due to aging or dendrite growth. In the case of large-scale facilities, there is a problem that enormous property damage occurs.

[0006] Meanwhile, battery packs containing battery modules utilize air-cooling or water-cooling technology to maintain appropriate cell temperatures. However, proper temperature control is impossible in the event of thermal runaway within a battery cell. This can lead to thermal runaway spreading to adjacent cells, potentially igniting the entire battery and resulting in a serious fire.

[0007] To extinguish fires caused by thermal runaway of battery cells, numerous prior art documents have been developed that incorporate separate fire extinguishing devices within battery modules or packs. However, due to space and structural constraints, these devices often lack sufficient fire extinguishing agents to extinguish fires within battery cells. Furthermore, existing patents typically spray small amounts of fire extinguishing agents from specific locations, which is insufficient to extinguish fires within actual batteries. Furthermore, battery cells are placed in close contact with each other, preventing sufficient contact between the fire-initiated cell and allowing the fire to easily spread to adjacent cells.

[0008] Accordingly, the present invention was developed to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a battery pack for an electric vehicle having a fire extinguishing function that sprays a fire extinguishing agent stored in a fire extinguishing agent storage container only to a battery module area where a fire or an abnormality occurs based on temperature information measured by a temperature detection sensor, thereby allowing the fire extinguishing agent to quickly cool a battery cell or be absorbed into the interior of the battery cell to suppress an internal thermal runaway reaction and prevent transfer to an adjacent cell.

[0009] In order to achieve the above object, the battery pack for an electric vehicle having a fire extinguishing function of the present invention comprises a plurality of battery modules each having a temperature detection sensor, a case accommodating the plurality of battery modules, a fire extinguishing fluid storage container disposed in the case and storing a predetermined amount of fire extinguishing fluid at a predetermined supply pressure, and a supply means for supplying the fire extinguishing fluid in the fire extinguishing fluid storage container through a corresponding pipe based on information detected by the temperature detection sensor to a battery module in which a fire has occurred or an abnormality has occurred, wherein the case comprises a case body and a case cover, and the case cover comprises an external means configured such that a plurality of fire extinguishing fluid receiving portions corresponding to the number of the plurality of battery modules are respectively positioned on the upper portions of the respective battery modules, and a plurality of open-type spray nozzles formed on the external means so as to be respectively communicated with the plurality of fire extinguishing fluid receiving portions in a direction toward the respective battery modules, and the external means comprises one upper plate and a plurality of lower plates that are welded to each other to form a plurality of fire extinguishing fluid receiving portions, each having an internal space of a predetermined size, and the plurality of spray nozzles are respectively installed on the lower plates, and the pipes are respectively connected to the plurality of fire extinguishing fluid receiving portions. It is characterized by.

[0010] The upper plate has a plurality of internal spaces of a predetermined size for forming the plurality of extinguishing liquid receiving portions by press forming a plate of a predetermined size, and the lower plate has an internal space of a predetermined size formed by press forming a plate corresponding to the size of the extinguishing liquid receiving portions, which is added to the internal space of a predetermined size formed in the upper plate to form the internal spaces of the plurality of extinguishing liquid receiving portions, and the plurality of extinguishing liquid receiving portions can be formed by welding the edge portions of the plurality of lower plates to connect the upper and lower plates to each other.

[0011] The upper plate has a plurality of internal spaces of a predetermined size for forming the plurality of extinguishing liquid receiving portions by press forming a plate of a predetermined size, and the lower plate is configured in a plate shape corresponding to the size of the extinguishing liquid receiving portions. The plurality of extinguishing liquid receiving portions may be formed by welding the edge portions of the plurality of lower plates to connect the upper and lower plates to each other.

[0012] It is preferable that the upper and lower plates are provided with a plurality of embossed portions welded to each other at least on one side, such that the ends protrude inwardly so that they make surface contact with each other within the digestive fluid receiving portion when they are pressed against each other.

[0013] The above digestive fluid storage container is placed near the edge of the case body, and may be configured as an integral part of the case body, or may be configured by forming a receiving space near the edge of the case body and inserting and fixing a separate container into the receiving space.

[0014] It is preferable to use a fire extinguishing agent having an electrical conductivity of 10 μS / cm or less and a surface tension of 30 dyne / cm or less as the above fire extinguishing agent.

[0015] It is preferable that the case body has a partition structure inside that is divided into a plurality of sections so that the plurality of battery modules can be accommodated in their respective separate spaces.

[0016] It is preferable that the inner surface of the above digestive fluid receiving portion has an embossed shape.

[0017] The supply means may include a distributor connected to the extinguishing agent storage container, a plurality of pipes each connecting the distributor and the plurality of extinguishing agent receiving units, a plurality of valves each installed inside the distributor so as to selectively supply the extinguishing agent to the plurality of pipes, and a control unit that controls the opening of the valves so that the extinguishing agent is supplied to the extinguishing agent receiving unit where the corresponding battery module where a fire or an abnormality occurs is located based on temperature information measured by each of the temperature detection sensors and is sprayed through a plurality of spray nozzles.

[0018] This invention sprays the fire extinguishing agent stored in the fire extinguishing agent storage container only to the battery module area where a fire or an abnormality occurs based on temperature information measured by a temperature detection sensor, so that the fire extinguishing agent can quickly cool the battery cell or be absorbed into the interior of the battery cell to suppress the internal thermal runaway reaction and prevent the transfer to adjacent cells.

[0019] Figures 1 and 2 are a schematic diagram and a cross-sectional view, respectively, showing the configuration of a battery pack for an electric vehicle having a fire extinguishing function according to one embodiment of the present invention.

[0020] Figure 3 is a perspective view showing the configuration of the case body shown in Figure 1.

[0021] Figure 4 is a plan view of a battery module arranged within the bulkhead of the case body illustrated in Figure 3.

[0022] Figures 5 and 6 are upper and lower perspective views showing the configuration of the case cover illustrated in Figure 1.

[0023] Figures 7 and 8 are cross-sectional perspective views and side views of a portion of the case cover illustrated in Figure 5,

[0024] Figure 9 is a conceptual diagram illustrating the configuration of the supply means illustrated in Figure 1.

[0025] Hereinafter, this invention will be described in more detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, they should be construed in a way that is consistent with the technical concept of this invention. Furthermore, unless otherwise defined, the technical and scientific terms used have the meanings commonly understood by those of ordinary skill in the art to which this invention pertains. In the following description and the attached drawings, descriptions of well-known functions and configurations that may unnecessarily obscure the gist of this invention are omitted. The attached drawings are provided as examples to ensure that those skilled in the art can sufficiently convey the spirit of this invention. Accordingly, this invention is not limited to the drawings presented below and may be embodied in other forms. Furthermore, like reference numerals designate like elements throughout the specification. It should be noted that like reference numerals are used throughout the drawings to indicate like elements wherever possible.

[0026] The battery pack for an electric vehicle having a fire extinguishing function according to the present invention is configured to extinguish a fire or prevent a fire in advance by spraying a fire extinguishing agent stored in a fire extinguishing agent storage container only to a battery module area where a fire or an abnormality occurs based on temperature information measured by a temperature detection sensor.

[0027] FIG. 1 and FIG. 2 are a schematic diagram and a cross-sectional diagram respectively showing the configuration of a battery pack for an electric vehicle having a fire extinguishing function according to one embodiment of the present invention, FIG. 3 is a perspective view showing the configuration of the case body shown in FIG. 1, and FIG. 4 is a plan view showing a state in which a battery module is arranged within a bulkhead of the case body shown in FIG. 3.

[0028] As illustrated in FIGS. 1 to 4, a battery pack according to this embodiment comprises a plurality of battery modules (100) each having a temperature detection sensor (not shown), a case (200) accommodating the plurality of battery modules (100), a fire extinguishing agent storage container (300) disposed in the case (200) and storing a certain volume of fire extinguishing agent at a certain supply pressure, and a supply means (400) for supplying the fire extinguishing agent in the fire extinguishing agent storage container (300) to a battery module in which a fire or an abnormality occurs based on information detected by a temperature detection sensor.

[0029] The above battery module (100) is a component that generates electrochemical energy by the movement of ions or electrons, and may be arranged in multiple numbers inside the case (200). Here, the battery modules (100) may be arranged in multiple rows and columns inside the case (200) (see FIG. 4). In addition, one battery module (100) may include multiple stacked battery cells (110) as shown in FIG. 4, and each battery cell (110) may include a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate. In addition, the battery module (100) may be equipped with a protection circuit module provided in each battery cell (110), or a protection circuit module integrally connected to multiple battery cells, and the protection circuit module may control the voltage or current during charging and discharging of the battery cell (110). Additionally, electrode tabs may be withdrawn from each battery cell (110), and the electrode assembly may include any known form, such as a laminated or wound type.

[0030] The case (200) above is a member that accommodates a plurality of battery modules (100), preferably each of which is accommodated in its own separate space, and may include a case body (220) and a case cover (210). Here, the case body (220) can accommodate a plurality of battery modules (100) inside, has a box shape with one side open, and may be configured to have a partition structure divided into a plurality of sections inside so that a plurality of battery modules (100) can be accommodated in their own separate spaces (see FIGS. 3 and 4). Accordingly, the extinguishing agent may be filled only in the separate space of the battery module (100) that was first ignited, and may be submerged up to the height of all or part of the battery module (100) therein (see FIG. 1). Meanwhile, the bulkhead (221) of the case body (220) can be configured to have a height lower than the rim of the case body (220). In this case, the fire extinguishing agent is primarily filled in the separation space of the ignited battery module (100) to extinguish the fire, and when it overflows beyond the bulkhead (221), it is filled in the separation space of the adjacent battery module (100) to prevent the spread of flame and heat to adjacent cells.

[0031] The above case cover (210) can open and close one open side of the case body (220). Therefore, when the case cover (210) is closed with respect to the case body (220), the interior of the case (200) can be protected from the external environment.

[0032] In addition, the case cover (210) is configured to have a function of sealing the inside of the case body (220) and a fire extinguishing function of spraying the fire extinguishing agent stored in the fire extinguishing agent storage container (300) only to the area of ​​the battery module (100) where a fire or an abnormality occurs, thereby extinguishing or preventing a fire caused by thermal runaway. That is, the case cover (210) is configured in a plate shape so that when an abnormality or thermal runaway occurs in a specific cell or module, a large amount of fire extinguishing agent is concentratedly sprayed to the corresponding battery, thereby effectively extinguishing the fire and preventing it from spreading to adjacent cells.

[0033] FIGS. 5 and 6 are upper and lower perspective views illustrating the configuration of the case cover illustrated in FIG. 1, and FIGS. 7 and 8 are cross-sectional perspective views and side views illustrating a portion of the case cover illustrated in FIG. 5.

[0034] As shown in FIG. 1, FIG. 5 to FIG. 8, the case cover (210) is configured to include an external means (211) configured in the form of a plate of a certain width so that a number of extinguishing liquid receiving portions (213) corresponding to the number of battery modules (100) are positioned on the upper portions of each battery module (100), and a number of open-type spray nozzles (215) formed on the external means (211) so as to communicate with each of the plurality of extinguishing liquid receiving portions (213) in a direction toward each of the battery modules (100).

[0035] The above-mentioned external means (211) serves as a frame that constitutes the exterior of the case cover (210), and is composed of an upper plate (212) and a plurality of lower plates (214) that are press-formed to form a plurality of divided extinguishing liquid receiving portions (213) and are welded to each other along the edges of the plurality of extinguishing liquid receiving portions (213) to form a plurality of extinguishing liquid receiving portions (213) each having a predetermined internal space. The upper and lower plates (212, 214) of this embodiment are made of a metal material such as stainless steel or aluminum, and are preferably between 0.2 and 1.0 mm in consideration of rigidity and weight reduction. Meanwhile, the overall thickness of the case cover (210) is preferably between 3 and 10 mm in consideration of the extinguishing liquid capacity and the vehicle structure and weight.

[0036] Specifically, the upper plate (212) is configured to have a plurality of internal spaces of a predetermined size for forming a plurality of extinguishing agent receiving portions (213) by press forming a plate of a predetermined size, and the lower plate (214) is configured to have an internal space of a predetermined size that is added to the internal space of a predetermined size formed in the upper plate (212) by press forming a plate corresponding to the size of the extinguishing agent receiving portions (213) to form the internal space of the extinguishing agent receiving portions (213). In addition, the lower plate (214) has a plurality of holes perforated for arranging and installing a plurality of spray nozzles (215). The plurality of lower plates (214) configured in this way are respectively arranged to cover the internal spaces of the predetermined sizes of the upper plate (212), and the upper and lower plates (212, 214) are joined to each other by welding the edge portions of the plurality of lower plates (214), thereby forming a plurality of extinguishing agent receiving portions (213).

[0037] Meanwhile, when the upper and lower plates (212, 214) are press-formed flat, the inner upper and lower surfaces of the extinguishing agent receiving portion (213) have a smooth and flat shape. However, when the upper and lower plates (212, 214) are press-formed so as to have an embossed shape protruding inward, the inner upper and lower surfaces of the extinguishing agent receiving portion (213) have a plurality of embossed portions (216, 217) as shown in FIGS. 7 and 8. Here, the upper and lower plates (212, 214) are configured to have the same embossed portions (216, 217), so that when they are pressed against each other, the ends of the embossed portions (216, 217) come into surface contact with each other. Accordingly, by welding the upper plate (212) along the edge portion of each lower plate (214), each extinguishing agent receiving portion (213) is formed, and by welding the embossed portions (216, 217) that are in close contact with each other, it is possible to secure rigidity to prevent the extinguishing agent receiving portion (213) from being expanded and deformed by the internal high-pressure extinguishing agent.

[0038] The outer form (211) of this embodiment can also be configured to have a plurality of extinguishing agent receiving portions (213) by welding press-formed upper and lower plates one by one while facing each other to form a plurality of extinguishing agent receiving portions (213). However, when using upper and lower plates one by one, the overall weight of the outer form (211) increases due to unnecessary parts that are not used to form the extinguishing agent receiving portions (213), and in order to weld large-sized upper and lower plates to each other, the welding line is long and the number of welding portions increases, which reduces handling and workability in the manufacturing process and lowers the yield. In particular, hundreds of spray nozzles must be welded to the lower plate, and there is a disadvantage that the entire lower plate must be discarded even if a welding defect occurs in one spray nozzle.

[0039] However, the external means (211) of this embodiment is composed of one upper plate (212) of the above-described form and a plurality of lower plates (214) having the same number of extinguishing agent receiving portions (213), thereby reducing the overall weight of the external means (211) by removing unnecessary portions that are not used to form the extinguishing agent receiving portions (213), and by welding the edge portions of the plurality of lower plates (214) to form each extinguishing agent receiving portion (213), the upper and lower plates (212, 214) can be joined to each other, thereby improving workability. In addition, in a separate process, a spray nozzle (215) can be mounted on each lower plate (214), and after a leak test, the lower plates (214) can be quickly welded to the upper plate (212) through a joining process with the upper plate (212).

[0040] Meanwhile, in this embodiment, the upper and lower plates (212, 214) are each press-formed to provide a space for forming the extinguishing agent receiving portion (213), but only the upper plate (212) may be press-formed and the lower plate (214) may be formed as a flat plate without press-forming. If only the upper plate (212) is press-formed in this way, the internal space of the extinguishing agent receiving portion (213) may become narrow. Taking this into consideration, the depth of the press-forming may be deepened to increase the internal space. In this case, since only the upper plate (212) has the 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 secure rigidity to prevent the extinguishing agent receiving portion (213) from expansion deformation due to the internal high-pressure extinguishing agent.

[0041] The above injection nozzles (215) are open nozzles directed toward each battery module (100), and are installed in a plurality of holes formed in the lower plate (214) so ​​as to communicate with each extinguishing agent receiving portion (213).

[0042] Meanwhile, the injection nozzle (215) can be formed by forming a hole by protruding a portion of the lower plate (214) further outward through a burring process during press forming for the lower plate (214), and the hole can be used as the injection nozzle (215). That is, the injection nozzle (215) can be formed as an integral part of the lower plate (214) without attaching a separate plug for nozzle manufacturing, thereby reducing manufacturing costs and thickness.

[0043] As shown in FIGS. 1 and 2, the extinguishing agent storage container (300) stores a certain amount of extinguishing agent at a certain discharge pressure and supplies the extinguishing agent only to the corresponding battery module area when a fire occurs or an abnormality occurs in the battery. The extinguishing agent storage container (300) is connected to one side of the extinguishing agent receiving portion (213) of the case cover (210) through a pipe (420) via a distributor (410) to be described later.

[0044] Meanwhile, the extinguishing fluid storage container (300) is arranged near the edge of the case body (220), and may be configured as an integral part of the case body (220), or may be configured by forming a receiving space near the edge of the case body (220) and inserting and fixing a separate container into the receiving space. It is preferable that the extinguishing fluid storage container (300) be arranged and configured in a form that makes maximum use of the area near the edge of the case body (220), taking into consideration the structure of the case (200) to be arranged and fixed in the electric vehicle, the receiving space of a plurality of battery modules (100) to be accommodated inside the case body (220), etc. For example, the extinguishing fluid storage container (300) may be arranged and configured at both edges of the case body (220) as shown in FIGS. 1 and 2.

[0045] The above-mentioned extinguishing agent storage container (300) has a structure in which a certain volume of extinguishing agent is filled so as to have a certain injection pressure within the container. At this time, in order to store the extinguishing agent so as to have a certain injection pressure, the internal space of the container may be filled with a pressurized gas (e.g., nitrogen, carbon dioxide 5 to 10 bar) that does not cause a combustion reaction. Meanwhile, a cooling extinguishing agent having insulating and penetrating properties may be used as the extinguishing agent. It is preferable to use a extinguishing agent having characteristics such as an electrical conductivity of 10 μS / cm or less and a surface tension of 30 dyne / cm or less based on water with a high latent heat of vaporization. Here, when the electrical conductivity exceeds 10 μS / cm, an electrical short circuit may occur at the battery terminal and cell electrode, which may cause an additional thermal runaway reaction. In addition, when the surface tension exceeds 30 dyne / cm, the permeability and wettability are reduced, which has the disadvantage of delaying the cooling and extinguishing reaction deep into the cell. Therefore, it is preferable to use a extinguishing agent that satisfies the above conditions.

[0046] Figure 9 is a conceptual diagram illustrating the configuration of the supply means illustrated in Figure 1. As shown in FIG. 1 and FIG. 9, the supply means (400) is configured to intensively supply the extinguishing agent stored in the extinguishing agent storage container (300) only to the battery module (100) area where a fire has occurred or an abnormality has occurred based on temperature information measured by a temperature detection sensor, and comprises: a distributor (410) connected to the extinguishing agent storage container (300); a plurality of pipes (420) each connecting the distributor (410) to a plurality of extinguishing agent receiving units (213); a plurality of valves (430) each installed inside the distributor (410) so as to selectively supply the extinguishing agent to the plurality of pipes (420); and a valve (430) controlled to open so that the extinguishing agent is supplied to the extinguishing agent receiving unit (213) where the battery module (100) where a fire has occurred or an abnormality has occurred (exceeding the battery use temperature limit or the temperature increase rate per hour) is located based on temperature information measured by each temperature detection sensor, and sprayed through a plurality of spray nozzles (215). It consists of a control unit (not shown).

[0047] In this embodiment, the extinguishing fluid receiving section (213) of the case cover (210) is divided into six sections, and thus the number of pipes (420) and valves (430) is configured as six, but it is also possible to configure more or less than that as needed. Meanwhile, it is preferable that the valve (430) of this embodiment be configured as an electronic solenoid valve.

[0048] Meanwhile, the battery pack of this embodiment is configured to have a vent valve (not shown) in the case body (220) in the same manner as a general battery pack, so that when a fire occurs in the battery, the vent valve opens to enable smooth spraying of the extinguishing agent without being affected by the internal pressure inside the case (200).

[0049] The battery pack of this embodiment configured as described above can spray the extinguishing agent stored in the extinguishing agent storage container (300) only to the area of ​​the battery module (100) where a fire or an abnormality occurs based on the temperature information measured by the temperature detection sensor, thereby submerging part or all of the battery with the extinguishing agent, thereby suppressing the internal thermal runaway reaction by absorbing the extinguishing agent into the interior of the battery cell and preventing the spread to adjacent cells. In addition, if the extinguishing agent overflows beyond the bulkhead (221) of the battery module (100) where the fire has occurred, it can also serve to prevent the spread of flame and heat to adjacent cells by filling the separation space of the adjacent battery module (100).

[0050] The technical details of the battery pack for an electric vehicle having a fire extinguishing function of the present invention have been described above with the accompanying drawings, but this has only exemplified the best embodiment of the present invention. Therefore, the present invention is not limited to the embodiments described above, and it will be apparent 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 also fall within the claims of the present invention.

[0051] This invention is applied to electric vehicles and is used to extinguish fires that occur in batteries.

Claims

1. A battery module having a plurality of battery modules each having a temperature detection sensor, a case accommodating the plurality of battery modules, a fire extinguishing agent storage container arranged in the case and storing a certain amount of fire extinguishing agent at a certain supply pressure, and a supply means for supplying the fire extinguishing agent in the fire extinguishing agent storage container through a corresponding pipe based on information detected by the temperature detection sensor to a battery module in which a fire has occurred or an abnormality has occurred. The above case includes a case body and a case cover, The case cover includes an external means configured to have a number of fire extinguishing fluid receiving portions, equal to the number of battery modules, positioned on the upper portions of each battery module, and a number of open spray nozzles formed on the external means to communicate with the number of fire extinguishing fluid receiving portions in a direction toward each of the battery modules. The above external means includes one upper plate and a plurality of lower plates that are welded to each other to form a plurality of digestive fluid receiving portions, each having an internal space of a certain size. The plurality of injection nozzles are respectively installed on the lower plate, and the pipes are respectively connected to the plurality of extinguishing liquid receiving portions. A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the upper and lower plates are formed to protrude inwardly so that, when pressed against each other, the ends thereof come into surface contact with each other within the fire extinguishing fluid receiving portion, and are welded to each other between the upper and lower portions, at least on one side.

2. In claim 1, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is placed near the edge of the case body.

3. In claim 2, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is configured as an integral part of the case body or by forming a receiving space near the edge of the case body and inserting and fixing a separate container into the receiving space.

4. In claim 1, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the above fire extinguishing agent uses a fire extinguishing agent having characteristics of an electrical conductivity of 10 μS / cm or less and a surface tension of 30 dyne / cm or less.

5. In claim 1, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the case body has a partition structure inside that is divided into a plurality of sections so that the plurality of battery modules can be accommodated in their respective separate spaces.

6. In claim 1, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the supply means includes a distributor connected to the fire extinguishing agent storage container, a plurality of pipes each connecting the distributor and the plurality of fire extinguishing agent receiving units, a plurality of valves each installed inside the distributor so as to selectively supply the fire extinguishing agent to the plurality of pipes, and a control unit that controls the valves to be opened so that the fire extinguishing agent is supplied to the fire extinguishing agent receiving unit where the corresponding battery module in which a fire or an abnormality occurs is located based on temperature information measured by each of the temperature detection sensors and is sprayed through a plurality of spray nozzles.

7. A battery module having a plurality of battery modules each having a temperature detection sensor, a case accommodating the plurality of battery modules, a fire extinguishing agent storage container arranged in the case and storing a certain amount of fire extinguishing agent at a certain supply pressure, and a supply means for supplying the fire extinguishing agent in the fire extinguishing agent storage container through a corresponding pipe based on information detected by the temperature detection sensor to a battery module in which a fire has occurred or an abnormality has occurred. The above case includes a case body and a case cover, The case cover includes an external means configured to have a number of fire extinguishing fluid receiving portions, equal to the number of battery modules, positioned on the upper portions of each battery module, and a number of open spray nozzles formed on the external means to communicate with the number of fire extinguishing fluid receiving portions in a direction toward each of the battery modules. The above external means includes one upper plate and a plurality of lower plates that are welded to each other to form a plurality of digestive fluid receiving portions, each having an internal space of a certain size. The plurality of injection nozzles are respectively installed on the lower plate, and the pipes are respectively connected to the plurality of extinguishing liquid receiving portions. The upper plate has a plurality of internal spaces of a certain size for forming a plurality of digestive fluid receiving portions 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 digestive fluid receiving portion, and is added to the internal space of a certain size formed in the upper plate to form an internal space of a certain size, which forms each of the internal spaces of the plurality of digestive fluid receiving portions. A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the plurality of fire extinguishing fluid receiving portions are formed by welding the edge portions of the plurality of lower plates to connect the upper and lower plates to each other.

8. In claim 7, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is placed near the edge of the case body.

9. In claim 8, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is configured as an integral part of the case body or by forming a receiving space near the edge of the case body and inserting and fixing a separate container into the receiving space.

10. In claim 7, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the above fire extinguishing agent uses a fire extinguishing agent having characteristics of an electrical conductivity of 10 μS / cm or less and a surface tension of 30 dyne / cm or less.

11. In claim 7, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the case body has a partition structure inside that is divided into a plurality of sections so that the plurality of battery modules can be accommodated in their respective separate spaces.

12. In claim 7, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the supply means includes a distributor connected to the fire extinguishing agent storage container, a plurality of pipes each connecting the distributor and the plurality of fire extinguishing agent receiving units, a plurality of valves each installed inside the distributor so as to selectively supply the fire extinguishing agent to the plurality of pipes, and a control unit that controls the valves to be opened so that the fire extinguishing agent is supplied to the fire extinguishing agent receiving unit where the corresponding battery module in which a fire or an abnormality occurs is located based on temperature information measured by each of the temperature detection sensors and is sprayed through a plurality of spray nozzles.

13. A battery module having a plurality of battery modules each having a temperature detection sensor, a case accommodating the plurality of battery modules, a fire extinguishing agent storage container arranged in the case and storing a certain amount of fire extinguishing agent at a certain supply pressure, and a supply means for supplying the fire extinguishing agent in the fire extinguishing agent storage container through a corresponding pipe based on information detected by the temperature detection sensor to a battery module in which a fire has occurred or an abnormality has occurred. The above case includes a case body and a case cover, The case cover includes an external means configured to have a number of fire extinguishing fluid receiving portions, equal to the number of battery modules, positioned on the upper portions of each battery module, and a number of open spray nozzles formed on the external means to communicate with the number of fire extinguishing fluid receiving portions in a direction toward each of the battery modules. The above external means includes one upper plate and a plurality of lower plates that are welded to each other to form a plurality of digestive fluid receiving portions, each having an internal space of a certain size. The plurality of injection nozzles are respectively installed on the lower plate, and the pipes are respectively connected to the plurality of extinguishing liquid receiving portions. The upper plate has a plurality of internal spaces of a certain size for forming a plurality of digestive fluid receiving portions by press forming a plate of a certain size, The above lower plate is configured in a plate shape corresponding to the size of the digestive fluid receiving portion, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the plurality of fire extinguishing fluid receiving portions are formed by welding the edge portions of the plurality of lower plates to connect the upper and lower plates to each other.

14. In claim 13, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is placed near the edge of the case body.

15. In claim 14, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the fire extinguishing liquid storage container is configured as an integral part of the case body or by forming a receiving space near the edge of the case body and inserting and fixing a separate container into the receiving space.

16. In claim 13, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the above fire extinguishing agent uses a fire extinguishing agent having characteristics of an electrical conductivity of 10 μS / cm or less and a surface tension of 30 dyne / cm or less.

17. In claim 13, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the case body has a partition structure inside that is divided into a plurality of sections so that the plurality of battery modules can be accommodated in their respective separate spaces.

18. In claim 13, A battery pack for an electric vehicle having a fire extinguishing function, characterized in that the supply means includes a distributor connected to the fire extinguishing agent storage container, a plurality of pipes each connecting the distributor and the plurality of fire extinguishing agent receiving units, a plurality of valves each installed inside the distributor so as to selectively supply the fire extinguishing agent to the plurality of pipes, and a control unit that controls the valves to be opened so that the fire extinguishing agent is supplied to the fire extinguishing agent receiving unit where the corresponding battery module in which a fire or an abnormality occurs is located based on temperature information measured by each of the temperature detection sensors and is sprayed through a plurality of spray nozzles.

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