Special small fire extinguishing device for battery box

Abstract

The utility model relates to the field of fire extinguishing devices, in particular to a special small fire extinguishing device for a battery box. Comprising a support, the support is fixed in a battery box body, a shell is fixed on the support, a plurality of spray holes are formed in the shell, an aerosol generating agent and an electronic enlightening device are packaged in the shell, branch pipes are fixed on two sides of the shell, limiting pipes are fixed on the branch pipes above unit batteries in the battery box body, and temperature control probes are packaged in the limiting pipes. A window is formed in the limiting pipe part on the outer side of the temperature control probe, the temperature control probe is electrically connected with the controller through a wire, the power supply and the electronic inspirator are electrically connected with the controller, the upper end of the limiting pipe tightly abuts against the top plate of the battery box body, and the lower end of the limiting pipe tightly abuts against the upper end of the unit battery below the limiting pipe. The temperature control probe is packaged in the limiting pipe made of the heat insulation material, and the limiting pipe is limited by the unit battery and the top plate of the battery box body, so that the stability of the temperature control probe can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of fire extinguishing devices, specifically to a small fire extinguishing device for battery boxes. Background Technology

[0002] Some battery boxes contain multiple individual cells for energy storage. However, most existing individual cells are lithium-ion batteries, which can cause serious damage if they experience thermal runaway and ignite. The new thermal aerosol fire extinguishing device incorporates a pyrotechnic agent composed of oxidizers, reducing agents, and some additives. This agent, upon activation, undergoes a vigorous redox combustion reaction within itself, generating a cohesive aerosol. This cohesive aerosol is a gaseous dispersion resembling pure white smoke, which can remain suspended in the fire space for an extended period, possessing very high fire extinguishing capabilities. Combining the battery box with the new thermal aerosol fire extinguishing device can effectively extinguish fires when individual cells within the battery box experience thermal runaway.

[0003] Patent document CN219979638U discloses a battery box and battery pack with a built-in fire extinguishing device. When a temperature sensor detects that the ambient temperature inside the battery box reaches its activation temperature, the sensor outputs an activation current, which is transmitted to the fire extinguishing device. This causes the aerosol inside the fire extinguishing device to react rapidly, generating a large amount of gas that is discharged through the nozzle, thus extinguishing the fire. The fire extinguishing device is located inside the battery box and above the battery pack. In this embodiment, the fire extinguishing device is fixedly mounted on top of the battery pack and does not contact the inner surface of the battery box. A certain gap exists between the fire extinguishing device and the inner surface of the battery box to prevent the temperature of the inner surface of the battery box from affecting the fire extinguishing device, thus preventing delayed fire extinguishing or activation of the fire extinguishing device before the battery experiences thermal runaway. That is, there is a certain gap between the outer surface of the temperature sensor and the surface of the partition to prevent the temperature of the partition surface from affecting the temperature sensor, causing the temperature sensor 330 to output a starting current to activate the fire extinguishing device when the fire is not extinguished in time or the battery has not experienced thermal runaway. However, in the battery box of an electric vehicle, the electric vehicle will experience significant vibration during driving. Therefore, if the temperature sensor is only fixedly connected to the thermal aerosol fire extinguishing component, the temperature sensor will come into contact with the battery box or cell unit when the electric vehicle is moving. This can easily cause the temperature of the outer surface of the cell unit or the inner surface of the battery box to affect the fire extinguishing device, resulting in delayed fire extinguishing or activation of the fire extinguishing device when the battery has not experienced thermal runaway. Utility Model Content

[0004] The technical problem to be solved by this utility model is a small fire extinguishing device for battery boxes that can effectively stabilize the temperature control probe and ensure that the temperature control probe can accurately detect the temperature inside the battery box.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A small fire extinguishing device for battery boxes includes a bracket fixed inside the battery box. A shell is fixed to the bracket, and the shell has multiple spray holes. An aerosol generator and an electronic initiator are encapsulated inside the shell. Branch pipes are fixed to both sides of the shell. Limiting tubes are fixed to the branch pipes above the individual cells inside the battery box. The limiting tubes are made of heat-insulating material and contain a temperature control probe. A window is opened on the outer part of the limiting tube around the temperature control probe. The temperature control probe is electrically connected to a controller via a wire located inside the branch pipe. A power supply and an electronic initiator are electrically connected to the controller. The upper end of the limiting tube abuts against the top plate of the battery box, and the lower end abuts against the upper end of the individual cell below it.

[0007] Specifically, the limiting tube is a ceramic fiber tube, and the upper and lower ends of the limiting tube are sealed.

[0008] Specifically, the branch pipe is an insulating pipe.

[0009] Specifically, the limiting tube has a through hole that communicates with the branch tube.

[0010] Specifically, the support is made of ceramic fiber material.

[0011] Specifically, the temperature control probe is located below the branch pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. By encapsulating the temperature control probe in a limiting tube made of heat-insulating material, and with the limiting tube being limited by the top plate of the unit battery and the battery box, the stability of the temperature control probe can be ensured. Therefore, this small fire extinguishing device is suitable for use in the battery box of electric vehicles.

[0014] 2. The limiting tube is made of heat-insulating material, which can prevent the temperature of the outer surface of the cell and the inner surface of the battery box from affecting this small fire extinguishing device, and prevent the fire extinguishing device from being activated when the fire is not extinguished in time or when the cell has not experienced thermal runaway.

[0015] 3. Each cell is equipped with a temperature control probe, which has a wide temperature measurement range inside the battery box. When a cell in the battery box experiences thermal runaway, this small fire extinguishing device can be activated in time to extinguish the fire. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the device.

[0017] Figure 2 This is a schematic diagram of the limiting tube.

[0018] Figure 3 This is a front view of the device.

[0019] Figure 4 This is a cross-sectional view of the branch pipe and fiber tube.

[0020] Figure 5 This is a schematic diagram showing the device installed inside the battery box.

[0021] The components in the attached diagram are named as follows: 1. Bracket, 2. Housing, 3. Spray nozzle, 4. Branch pipe, 5. Limiting pipe, 6. Temperature control probe, 7. Window, 8. Through hole, 9. Battery box, 10. Unit battery. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figures 1-5 As shown, a small fire extinguishing device for battery boxes includes a bracket 1 made of ceramic fiber. The bracket 1 has good heat insulation properties. The bracket 1 is fixed inside the battery box 9, and a shell 2 is fixed on the bracket 1. The shell 2 has multiple spray holes 3, and an aerosol generator and an electronic initiator are encapsulated inside the shell 2.

[0024] Both sides of the outer casing 2 are fixed with branch pipes 4, which are insulating pipes. Limiting pipes 5 are fixed to the branch pipes 4 above the unit batteries 10 inside the battery box 9. The limiting pipes 5 have through holes 8 that communicate with the branch pipes 4. The limiting pipes 5 are made of heat-insulating material; specifically, they are ceramic fiber pipes, and both ends of the limiting pipes 5 are sealed.

[0025] A temperature control probe 6 is encapsulated within the limiting tube 5, and the temperature control probe 6 is located below the branch tube 4. An opening 7 is provided on the outer portion of the limiting tube 5 containing the temperature control probe 6. The temperature control probe 6 is electrically connected to the controller via a wire located inside the branch tube 4. The power supply and electronic actuator are electrically connected to the controller.

[0026] The upper end of the limiting tube 5 is tightly against the top plate of the battery box 9, and the lower end of the limiting tube 5 is tightly against the upper end of the unit battery 10 below it.

[0027] When the cell 10 in the battery box 9 experiences thermal runaway, the temperature inside the battery box 9 rises. When the temperature inside the battery box 9 reaches the activation temperature of the temperature control probe 6, the temperature control probe 6 sends a signal to the controller. Then the controller sends current to the electronic initiator. The electronic initiator causes the aerosol generator to react rapidly and produce a large amount of gas, which is discharged from the nozzle 3 into the battery box 9 to extinguish the fire.

[0028] After this small fire extinguishing device is installed inside the battery box 9, the limiting tube 5 is limited by the unit battery 10 and the top plate of the battery box 9, which can ensure the stability of the temperature control probe 6 and prevent the temperature control probe 6 from directly contacting the battery box 9 and the unit battery 10. Therefore, this small fire extinguishing device is suitable for use in the battery box 9 of electric vehicles.

[0029] The limiting tube 5 is made of heat-insulating material, which can prevent the temperature of the outer surface of the unit battery 10 and the temperature of the inner surface of the battery box 9 from affecting this small fire extinguishing device, and prevent the fire extinguishing device from being activated when the fire is not extinguished in time or when the unit battery 10 has not experienced thermal runaway.

[0030] Each cell 10 is equipped with a temperature control probe 6, which has a wide temperature measurement range inside the battery box 9. When a cell 10 in the battery box 9 experiences thermal runaway, this small fire extinguishing device can be activated in time to extinguish the fire.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A small fire extinguishing device for battery boxes, comprising a bracket (1) fixed inside a battery box body (9), characterized in that, A housing (2) is fixed on the bracket (1). Multiple spray holes (3) are opened on the housing (2). An aerosol generator and an electronic initiator are encapsulated inside the housing (2). Branch pipes (4) are fixed on both sides of the housing (2). Limiting tubes (5) are fixed on the branch pipes (4) above the unit battery (10) inside the battery box (9). The limiting tubes (5) are made of heat insulation material. A temperature control probe (6) is encapsulated inside the limiting tubes (5). A window (7) is opened on the limiting tube (5) outside the temperature control probe (6). The temperature control probe (6) is electrically connected to the controller through a wire. The wire is located inside the branch pipe (4). The power supply and the electronic initiator are electrically connected to the controller. The upper end of the limiting tube (5) is close to the top plate of the battery box (9), and the lower end of the limiting tube (5) is close to the upper end of the unit battery (10) below it.

2. The small fire extinguishing device for battery boxes according to claim 1, characterized in that, The limiting tube (5) is a ceramic fiber tube, and the upper and lower ends of the limiting tube (5) are sealed.

3. The small fire extinguishing device for battery boxes according to claim 1, characterized in that, The branch pipe (4) is an insulating pipe.

4. The small fire extinguishing device for battery boxes according to claim 1, characterized in that, The limiting tube (5) has a through hole (8) which is connected to the branch tube (4).

5. A small fire extinguishing device for battery boxes according to claim 1, characterized in that, The support (1) is made of ceramic fiber material.

6. The small fire extinguishing device for battery boxes according to claim 1, characterized in that, The temperature control probe (6) is located below the branch pipe (4).

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