Fire extinguishing nozzle and portable battery box fire extinguishing system

Abstract

The utility model relates to battery box fire extinguishing technical field especially, it is a kind of fire extinguishing nozzle and portable battery box fire extinguishing system, fire extinguishing nozzle includes nozzle body and fusible body, nozzle body includes body part and stop part, body part has liquid passage and the liquid outlet of intercommunication liquid passage;Stop part is connected in body part, and blocks the part of liquid outlet;Fusible body is located in liquid passage, and blocks the other part of liquid outlet, and stop part and fusible body are in the axial stop of liquid passage, stop part can block fusible body and exit liquid passage, so that fusible body reliably blocks liquid outlet, fusible body is configured to be able to melt when higher than set temperature, fire extinguishing medium can enter the containing cavity by liquid passage, realize automatic spray and release fire extinguishing, reduce the overall cost of fire extinguishing device.

Description

Technical Field

[0001] This utility model relates to the field of fire extinguishing technology for battery boxes, and in particular to a fire extinguishing nozzle and a portable fire extinguishing system for battery boxes. Background Technology

[0002] Portable battery cases, such as those shaped like rolling suitcases, are large-capacity and portable, making them widely used as backup power sources for communication systems. They provide stable power to communication equipment in mobile power supply systems for base stations or large data centers. Currently, fire prevention measures for rolling suitcase lithium batteries mostly rely on manual fire extinguishing with handheld fire extinguishers. In unattended scenarios, this method cannot provide timely warnings, detect fires, or automatically extinguish them.

[0003] Chinese invention patent application number 201911009166.9 discloses a containerized lithium battery energy storage system and its fire-fighting device with fire-fighting function. It connects a nozzle to the container body, with an electrically controlled valve connected to the nozzle's inlet end. The end of the electrically controlled valve away from the nozzle is connected to a supply pipe. Sensors for detecting fire within the container and a control system for controlling the opening and closing of the electrically controlled valve are installed inside the container. When the sensor detects a fire, the control system opens the electrically controlled valve, allowing fire extinguishing liquid in the supply pipe to flow through the valve to the nozzle, which then sprays the fire extinguishing liquid into the container, thus extinguishing the fire. In this fire-fighting method, the opening of the nozzle outlet requires the control system to control the electrically controlled valve, and the inclusion of the control system, detection sensors, and electrically controlled valve results in a high overall cost for the fire-fighting system. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the opening of the fire extinguishing nozzle of the portable battery box currently requires the use of a control system and sensors, and the cost of the portable battery box fire extinguishing system is relatively high.

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a fire extinguishing nozzle, including a nozzle body and a fusible body; The nozzle body includes a body portion and an anti-detachment portion. The body portion has a liquid passage hole and a liquid outlet, and the liquid outlet communicates with the liquid passage hole. The anti-detachment portion is connected to the body portion and blocks a portion of the liquid outlet. The fusible element is disposed in the liquid passage and blocks another part of the liquid outlet. The anti-detachment part and the fusible element block the axial direction of the liquid passage to prevent the fusible element from detaching from the liquid passage. The fusible element is configured to melt at a temperature higher than a set temperature.

[0006] In some embodiments, the cross-section of the anti-detachment portion perpendicular to the axial direction of the liquid passage is circular, and the anti-detachment portion has a spray hole at its center; in the radial direction of the anti-detachment portion, the portion of the anti-detachment portion away from the spray hole is connected to the body portion, the portion of the anti-detachment portion near the spray hole blocks a portion of the liquid passage, and the portion of the anti-detachment portion near the spray hole blocks the fusible material.

[0007] In some embodiments, the diameter of the circular cross-section of the anti-detachment portion gradually decreases along the spraying direction of the spray hole.

[0008] In some embodiments, the inner wall of the liquid passage containing the fusible element has a frosted layer.

[0009] In some embodiments, the body portion includes a through portion and a wrench portion, the liquid passage hole passes through the through portion and the wrench portion, the anti-detachment portion is connected to the through portion, and the through portion is used to pass through the wall of the portable battery box so that the liquid outlet is located in the receiving cavity of the portable battery box; The box wall has mounting holes, and the through-hole is inserted into the mounting holes; the fire extinguishing nozzle also includes a clamping nut, the outer periphery of the through-hole is provided with external threads, the clamping nut is configured to be placed in the receiving cavity and threadedly fitted on the outside of the through-hole, and the wrench is connected to the end of the through-hole located outside the receiving cavity.

[0010] In some embodiments, the body portion further includes a connector portion for connecting a hose, wherein the end of the hose away from the connector portion is used for connecting a fire extinguishing medium supply device.

[0011] In some embodiments, the fire extinguishing nozzle for the battery box further includes a first sealing ring, which is sleeved on the outside of the through portion and arranged between the box wall and the lever portion.

[0012] In some embodiments, the fire extinguishing nozzle for the battery box further includes a second sealing ring, which is sleeved on the outside of the through portion and located between the clamping nut and the box wall.

[0013] This application also provides a portable battery box fire extinguishing system, including the above-mentioned fire extinguishing nozzle, a fire extinguishing medium supply device, and multiple portable battery boxes. The fire extinguishing medium supply device has a medium outlet, and the body of each portable battery box is connected to the fire extinguishing nozzle. The liquid passage of each fire extinguishing nozzle is connected to the medium outlet.

[0014] In some embodiments, the fire extinguishing medium supply device is a pressure tank, and the pressure tank contains heptafluoropropane fire extinguishing agent.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The fire extinguishing nozzle of this utility model includes a nozzle body and a fusible element. The nozzle body includes a body portion and an anti-detachment portion. The body portion has a liquid passage hole and a liquid outlet communicating with the liquid passage hole. The anti-detachment portion is connected to the body portion and blocks a portion of the liquid outlet. The fusible element is disposed in the liquid passage hole and blocks another portion of the liquid outlet. Moreover, the anti-detachment portion and the fusible element axially block the liquid passage hole. In use, the body portion is connected to a portable battery box, and the liquid outlet is arranged in the receiving cavity of the portable battery box. The fusible element can isolate the fire extinguishing medium in the liquid passage hole from the receiving cavity of the portable battery box. The anti-detachment portion can prevent the fusible element from detaching from the liquid passage hole, so that the fusible element reliably blocks the liquid outlet. The fusible element is configured to melt when the temperature is higher than a set temperature. When a fire occurs in the receiving cavity, the fusible element melts and flows out, the blocking state of the liquid passage hole is released, and the fire extinguishing medium can enter the battery box through the liquid passage hole to realize automatic fire extinguishing. Therefore, the fire extinguishing nozzle of this application can automatically open after a fire occurs in the portable battery box, without the need to install sensors to detect the fire, or to install an electronically controlled valve and control system to control the opening and closing of the liquid passage, thus reducing the overall cost of the fire extinguishing device. Attached Figure Description

[0016] Figure 1 A schematic diagram of the fire extinguishing nozzle of this application connected to a portable battery box; Figure 2 This is a structural schematic diagram of the fire extinguishing nozzle of this application after the fusible element has been installed; Figure 3 A schematic diagram of the structure of the fire extinguishing nozzle of this application without the fusible link installed; Figure 4 This is a structural schematic diagram of the portable battery box fire extinguishing system of this application; In the diagram, 100 is the box wall, 200 is the hose, 300 is the portable battery box, 400 is the extinguishing medium supply device, 500 is the multi-way valve, 1 is the nozzle body, 11 is the body part, 111 is the liquid passage hole, 112 is the liquid outlet, 113 is the through part, 114 is the tightening part, 115 is the connector part, 12 is the anti-detachment part, 121 is the spray hole, 2 is the fusible element, 3 is the clamping nut, 4 is the first sealing ring, and 5 is the second sealing ring. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0019] like Figures 1 to 3 As shown, a preferred embodiment of the fire extinguishing nozzle of this application is used to connect a fire extinguishing medium supply device 400 and a portable battery box 300. The portable battery box 300 has a receiving cavity and a box wall 100 for enclosing the receiving cavity. The fire extinguishing nozzle includes a nozzle body 1 and a fusible element 2. The nozzle body 1 includes a body portion 11 and an anti-detachment portion 12. The body portion 11 has a liquid passage hole 111 and a liquid outlet 112, and the liquid outlet 112 communicates with the liquid passage hole 111. The anti-detachment portion 12 is connected to the body portion 11 and blocks a portion of the liquid outlet 112. The fusible element 2 is disposed in the liquid passage hole 111 and blocks another portion of the liquid outlet 112. Moreover, the anti-detachment portion 12 and the fusible element 2 are axially blocked in the liquid passage hole 111, and the anti-detachment portion 12 can prevent the fusible element 2 from detaching from the liquid passage hole 111. The fusible element 2 is configured to melt at a temperature higher than a set temperature. Specifically, the main body 11 has an outlet end and an inlet end. The outlet 112 is located at the outlet end, and the inlet end has an inlet. After the fire extinguishing nozzle is installed on the box wall 100, the outlet end is located inside the receiving cavity, and the inlet end is located outside the receiving cavity. When no fire occurs in the receiving cavity, the fusible body 2 is in a solid state. The fusible body 2 can isolate the fire extinguishing medium in the liquid passage 111 from the receiving cavity of the portable battery box 300. The anti-detachment part 12 can prevent the fusible body 2 from detaching from the liquid passage 111, so that the fusible body 2 reliably seals the outlet 112. When a fire occurs in the receiving cavity, the fusible body 2 melts and flows out, the sealing state of the liquid passage 111 is released, and the fire extinguishing medium can enter the receiving cavity through the liquid passage 111 to realize automatic fire extinguishing. Therefore, the fire extinguishing nozzle of this application can automatically open after a fire occurs in the portable battery box 300, without the need to install sensors to detect the fire, or to install an electric control valve and control system to control the opening and closing of the liquid passage 111, thus reducing the overall cost of the fire extinguishing device.

[0020] In some embodiments of this application, the anti-detachment portion 12 has a circular cross-section perpendicular to the axial direction of the liquid passage 111. The center of the anti-detachment portion 12 has a spray hole 121. In the radial direction of the anti-detachment portion 12, the portion of the anti-detachment portion 12 away from the spray hole 121 is connected to the body portion 11. The portion of the anti-detachment portion 12 near the spray hole 121 blocks a part of the liquid passage 111, and the spray hole 121 connects to another part of the liquid passage 111. The portion of the anti-detachment portion 12 near the spray hole 121 stops the fusible body 2. The anti-detachment portion 12 is annular in shape, and its annular edge can form a continuous stopping surface in the axial direction of the liquid passage 111. Compared to point-like or sheet-like structures, this provides a larger contact area and more uniform force distribution with the fusible body 2. After the fusible body 2 melts, the extinguishing medium in the liquid passage 111 can flow into the receiving cavity through the spray hole 121. The anti-detachment part 12 can be manufactured by stamping and connected to the liquid outlet end of the main body 11 by welding. In other embodiments of this application, the anti-detachment part 12 can be a block, which is connected to the liquid outlet end of the main body 11 and blocks a portion of the liquid outlet 112.

[0021] In some embodiments of this application, the diameter of the circular cross-section of the anti-detachment part 12 gradually decreases along the spray direction of the spray hole 121. This arrangement results in a smaller diameter at the end of the anti-detachment part 12 away from the main body 11, and a diameter at the end of the anti-detachment part 12 close to the main body 11, making the end of the fire extinguishing nozzle inserted into the receiving cavity more pointed, which facilitates the assembly of the main body 11 onto the box wall 100.

[0022] In some embodiments of this application, the inner wall of the liquid passage 111 containing the fusible body 2 has a frosted layer. Specifically, in this embodiment, the fusible body 2 is formed in the liquid passage 111 by casting. Before pouring the fusible body 2 slurry, the anti-detachment part 12 is connected to the body part 11, and then the fusible body 2 slurry is injected into the liquid passage 111 through the liquid outlet 112. During the injection process, the body part 11 is kept in an up-and-down tilted state. During the injection of the fusible body 2 slurry, the part of the anti-detachment part 12 that blocks the liquid outlet 112 can prevent the fusible body 2 slurry injected into the liquid passage 111 in the initial stage from overflowing from the liquid outlet 112. During the injection process, the slurry injected into the liquid passage 111 in the early stage is simultaneously solidified and forms a foundation to support the subsequently injected fusible body 2 slurry. The fusible body 2 slurry is continuously poured until the liquid outlet 112 is completely blocked. The rough surface of the frosted layer allows the liquid fusible material 2 to form a convex-concave interlocking structure with the rough surface during cooling, increasing the adhesion between the solidified fusible material 2 and the sidewall of the liquid passage 111. When the anti-detachment component is a ring and the fusible material 2 is cast, the ring cavity will be filled with the fusible material 2. In this case, the inner sidewall of the ring can also be provided with a frosted layer. In other embodiments of this application, the fusible material 2 can be formed into a column in a molding die and then pressed into the liquid passage 111 by pressing, so that the column is interference-fitted into the liquid passage 111. After the column is pressed into the liquid passage 111, the anti-detachment part 12 is welded to the body part 11.

[0023] In some embodiments of this application, the main body 11 includes a through-hole 113 and a wrench 114. The through-hole 113 is used to pass through the wall 100 of the portable battery box 300 so that the liquid outlet 112 is located in the receiving cavity of the portable battery box 300. The liquid passage 111 passes through the through-hole 113 and the wrench 114. The anti-detachment part 12 is connected to the liquid outlet end of the main body 11. The wall 100 has a mounting hole, and the through-hole 113 passes through the mounting hole. The fire extinguishing nozzle also includes a clamping nut 3. The outer peripheral side of the through-hole 113 is provided with an external thread. The clamping nut 3 is configured to be able to be set in the receiving cavity and the thread is matched and sleeved on the outside of the through-hole 113. The wrench 114 is connected to the end of the through-hole 113 located outside the receiving cavity. The fire extinguishing nozzle of this application needs to be installed on the wall 100 of the portable battery box 300. During installation, the through-hole 113 is first passed through the mounting hole from the outside of the box, so that the liquid outlet extends into the receiving cavity, while the wrench 114 remains outside the box. Then, the clamping nut 3 is placed into the receiving cavity and fitted onto the external thread of the through-hole 113. The clamping nut 3 is then tightened to move it closer to the inside of the box wall 100 until the clamping nut 3 and the wrench 114 abut against the inner and outer walls of the box, respectively. Afterward, a wrench is used to clamp the wrench 114 outside the box, while another wrench is used inside the receiving cavity to tighten the clamping nut 3 until the nut is tightly fitted against the inside of the box wall 100, thus completing the fixation. After a fire occurs and the fusible material 2 melts, the fire extinguishing nozzle can be removed from the box wall 100, and the fusible material 2 can be refilled into the fire extinguishing nozzle, allowing the fire extinguishing nozzle of this application to be reused.

[0024] In some embodiments of this application, the main body 11 further includes a connector 115, which is used to connect a hose 200. The end of the hose 200 away from the connector 115 is used to connect to the fire extinguishing medium supply device 400. Specifically, the fire extinguishing medium supply device 400 and the connector 115 are connected by a quick-release structure. When transporting the portable battery box 300, the fire extinguishing medium supply device 400 is detached from the connector 115, allowing for separate transport of the fire extinguishing medium supply device 400 and the portable battery box 300. The connector 115 and the fire extinguishing medium supply device 400 are connected by a hose 200, with quick-release heads connected to both ends of the hose 200 to achieve rapid connection between the hose 200 and the fire extinguishing nozzle.

[0025] In some embodiments of this application, the connector 115, the wrench 114, and the through-hole 113 are integrally formed by die casting, facilitating mass production. The fusible element 2 is made of polyetherimide. The portable battery case 300 typically contains lithium batteries. Under normal use, the normal charging and discharging temperature of the lithium batteries is between 30°C and 60°C. When the temperature control performance of the lithium batteries deteriorates, the operating temperature will continue to rise, but below 200°C, spontaneous combustion is generally not possible. The glass transition temperature of polyetherimide is approximately 217°C. The actual processing melting temperature is approximately 340°C to 400°C, but the material softens significantly and loses structural strength at 200°C to 250°C, meeting the nozzle opening requirements. The room temperature compressive strength of polyetherimide reaches 100MPa to 150MPa. To improve the strength of the fusible element, in some embodiments of this application, glass fibers can be added to the polyetherimide to enhance its room temperature strength. The thickness of the fusible element filling the liquid passage along the axial direction of the liquid passage shall meet the melting requirements and ensure sealing performance. In this application, the melting temperature of the fusible element 2 is set at 200°C.

[0026] To ensure the airtightness of the portable battery box 300, in some embodiments of this application, the fire extinguishing nozzle further includes a first sealing ring 4, which is sleeved on the outside of the through-hole 113 and positioned between the box wall 100 and the screw-on part 114. The fire extinguishing nozzle for the battery box also includes a second sealing ring 5, which is sleeved on the outside of the through-hole 113 and positioned between the clamping nut 3 and the box wall 100. The presence of the first sealing ring 4 and the second sealing ring 5 enhances the airtightness between the through-hole 113 and the box wall 100, thereby enhancing the airtightness of the portable battery box 300. After a fire occurs in the battery pack within the housing cavity, the extinguishing medium sprayed from the fire extinguishing nozzle can fill the housing cavity, isolating the battery pack from the air and achieving rapid fire extinguishing.

[0027] In summary, the fire extinguishing nozzle of this utility model includes a nozzle body 1 and a fusible element 2. The nozzle body 1 includes a body portion 11 and an anti-detachment portion 12. The body portion 11 has a liquid passage hole 111 and a liquid outlet 112 communicating with the liquid passage hole 111. The anti-detachment portion 12 is connected to the body portion 11 and blocks a portion of the liquid outlet 112. The fusible element 2 is disposed in the liquid passage hole 111 and blocks another portion of the liquid outlet 112. In use, the body portion 11 is connected to a portable battery box 300, and the liquid outlet 112 is arranged in the portable battery box. The fusible body 2 in the housing cavity of the portable battery box 300 isolates the extinguishing medium inside the liquid passage 111 from the housing cavity of the portable battery box 300. The anti-detachment part 12 prevents the fusible body 2 from detaching from the liquid passage 111, ensuring that the fusible body 2 reliably seals the liquid outlet 112. The fusible body 2 is configured to melt when the temperature is higher than a set temperature. When a fire occurs in the housing cavity, the fusible body 2 melts and flows out, releasing the blockage of the liquid passage 111. The extinguishing medium can then enter the battery box through the liquid passage 111, achieving automatic fire suppression. Therefore, the fire extinguishing nozzle of this application can automatically open after a fire occurs in the portable battery box 300, eliminating the need for sensors to detect the fire and the need for electronic valves and control systems to control the opening and closing of the liquid passage 111, thus reducing the overall cost of the fire extinguishing device.

[0028] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] This application also provides an embodiment of a portable battery box fire extinguishing system, such as... Figure 4As shown, the device includes the aforementioned fire extinguishing nozzle, a fire extinguishing medium supply device, and multiple portable battery boxes 300. The fire extinguishing medium supply device has a medium outlet; the main body 11 also has a liquid inlet connected to a liquid passage 111. Each portable battery box 300 is connected to a fire extinguishing nozzle, and the liquid inlet of each fire extinguishing nozzle is connected to the medium outlet. Specifically, the fire extinguishing medium supply device is connected to multiple fire extinguishing nozzles via multiple hoses 200. The fire extinguishing medium supply device is a pressure tank containing heptafluoropropane fire extinguishing agent. The heptafluoropropane fire extinguishing agent is compressed into a liquid state and stored in the pressure tank. Before the fusible body 2 melts, each hose 200 and each liquid passage 111 is filled with heptafluoropropane fire extinguishing agent and is under high pressure. After a fire occurs, the fusible body 2 melts, and the high-pressure heptafluoropropane fire extinguishing agent is sprayed out from the liquid outlet 112 to extinguish the fire. Filling the pressure tank with heptafluoropropane extinguishing agent is done using a pressure pump. The pressure tank is equipped with a pressure gauge, filling valve, safety valve, normally closed vent valve, and outlet valve. The pressure pump is connected to the filling valve, which uses a standard quick-connect coupling or threaded connection. The pressure pump can be removed from the pressure tank after filling or remain connected. The pressure gauge displays the pressure in real time. Operators periodically check the pressure gauge readings to ensure the pressure tank is functioning correctly and that the extinguishing agent is dispensed at the correct pressure in case of fire. The safety valve automatically releases pressure when the pressure exceeds a set value, ensuring the safety of the pressure tank. The outlet valve connects to a multi-port connector, with each component connected to its corresponding port. The hose 200 adopts a multi-layer structure. The inner layer of the hose 200 is made of polytetrafluoroethylene (PTFE) lining, which has good chemical corrosion resistance, pressure resistance, flexibility and long-term stability. A reinforcing layer is set on the outside of the PTFE lining. The reinforcing layer is made of stainless steel wire braiding or spiral winding to improve pressure resistance. A polyurethane or fluororubber weather-resistant protective layer is set on the outside of the reinforcing layer. The connectors at both ends of the hose 200 are crimp-type hose 200 female connectors.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A fire extinguishing nozzle, characterized in that, Includes the nozzle body (1) and the fusible body (2); The nozzle body (1) includes a body part (11) and an anti-detachment part (12). The body part (11) has a liquid passage hole (111) and a liquid outlet (112). The liquid outlet (112) communicates with the liquid passage hole (111). The anti-detachment part (12) is connected to the body part (11) and blocks a portion of the liquid outlet (112). The fusible body (2) is disposed in the liquid passage (111) and blocks another part of the liquid outlet (112). The anti-detachment part (12) and the fusible body (2) block along the axial direction of the liquid passage (111). The fusible body (2) is configured to melt at a temperature higher than a set temperature.

2. The fire extinguishing nozzle according to claim 1, characterized in that, The anti-detachment part (12) has a circular cross-section perpendicular to the axial direction of the liquid passage (111). The anti-detachment part (12) has a spray hole (121) at its center. In the radial direction of the anti-detachment part (12), the part of the anti-detachment part (12) away from the spray hole (121) is connected to the body part (11). The part of the anti-detachment part (12) near the spray hole (121) blocks a part of the liquid passage (111). The part of the anti-detachment part (12) near the spray hole (121) blocks the fusible material (2).

3. The fire extinguishing nozzle according to claim 2, characterized in that, Along the spraying direction of the spray hole (121), the diameter of the circular cross section of the anti-detachment part (12) gradually decreases.

4. The fire extinguishing nozzle according to claim 1, characterized in that, The inner wall of the liquid passage (111) of the fusible body (2) has a frosted layer.

5. The fire extinguishing nozzle according to claim 1, characterized in that, The main body (11) includes a through part (113) and a wrench part (114). The liquid passage (111) passes through the through part (113) and the wrench part (114). The anti-detachment part (12) is connected to the through part (113). The through part (113) is used to pass through the wall (100) of the portable battery box (300) so that the liquid outlet (112) is located in the receiving cavity of the portable battery box (300). The fire extinguishing nozzle also includes a clamping nut (3), and the outer periphery of the through part (113) is provided with an external thread; the clamping nut (3) is configured to be threadedly fitted onto the outside of the through part (113) and is disposed in the receiving cavity; the wrench part (114) is connected to the end of the through part (113) located outside the receiving cavity.

6. The fire extinguishing nozzle according to claim 5, characterized in that, The main body (11) also includes a connector (115) for connecting a hose (200), and the end of the hose (200) away from the connector (115) is used to connect a fire extinguishing medium supply device.

7. The fire extinguishing nozzle according to claim 5, characterized in that, The fire extinguishing nozzle for the battery box also includes a first sealing ring (4), which is sleeved on the outside of the through part (113) and arranged between the box wall (100) and the wrench part (114).

8. The fire extinguishing nozzle according to claim 5, characterized in that, The fire extinguishing nozzle for the battery box also includes a second sealing ring (5), which is sleeved on the outside of the through part (113) and located between the clamping nut (3) and the box wall (100).

9. A fire extinguishing system for a portable battery box, characterized in that, The device includes the fire extinguishing nozzle as described in any one of claims 1 to 8, and further includes a fire extinguishing medium supply device and a plurality of portable battery boxes (300). The fire extinguishing medium supply device has a medium outlet, and the body of each portable battery box (300) is connected to the fire extinguishing nozzle. The liquid passage (111) of each fire extinguishing nozzle is in communication with the medium outlet.

10. The portable battery box fire extinguishing system according to claim 9, characterized in that, The fire extinguishing medium supply device is a pressure tank, which contains heptafluoropropane fire extinguishing agent.

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