Electric vehicle battery thermal runaway early warning and fire extinguishing device

Abstract

The invention relates to the technical field of electric vehicle battery thermal runaway early warning and fire extinguishing, in particular to an electric vehicle battery thermal runaway early warning and fire extinguishing device which comprises a protection assembly, an early warning heat dissipation assembly is installed in the protection assembly, and a fire extinguishing assembly is installed on the side of the early warning heat dissipation assembly; the adjustable display assembly comprises a bottom supporting frame, a bottom rotating rod is rotatably connected to the interior of the bottom supporting frame, a bottom cooling fan is fixedly connected to the top end of the bottom rotating rod, a temperature sensor is arranged on the side of the bottom cooling fan, and a power source is arranged on the top of the temperature sensor; a warning lamp is arranged at the top of the power source, a motor is arranged on the side of the power source, a worm is fixedly connected to the top of the motor, and a worm gear is meshed with the side of the worm; according to the modularized and linked structural design, the integration level and reliability of the device are improved, the installation and maintenance process is simplified, and all-around and efficient guarantee is provided for the safety of the battery of the electric vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal runaway early warning and fire extinguishing of electric vehicle batteries, and in particular to a thermal runaway early warning and fire extinguishing device for electric vehicle batteries. Background Art

[0002] In recent years, with the growing global demand for clean energy, electric vehicles have rapidly developed in the transportation sector, driven by their environmentally friendly and efficient features. As a core component of electric vehicles, lithium-ion batteries are widely used due to their high energy density and long cycle life. However, lithium-ion batteries are subject to the risk of thermal runaway during use. When a battery experiences an internal short circuit, overcharge or over-discharge, poor heat dissipation, or is subjected to external impact, the internal temperature of the battery rises sharply, triggering a series of violent chemical reactions that can lead to thermal runaway, fire, or even explosion, posing a serious threat to the lives and property of drivers and passengers.

[0003] Existing electric vehicle battery thermal runaway warning and fire-extinguishing devices have significant limitations in their warning functions. Most devices can only provide basic sound and light alarms. When the temperature sensor detects an anomaly, it only indicates the risk with flashing lights and harsh beeps, lacking an accurate assessment of the degree of thermal runaway risk. Due to the lack of multi-sensor data fusion analysis and intelligent algorithms, it is impossible to predict the development trend of thermal runaway. At the same time, there is a lack of effective linkage between the warning system and the battery management and vehicle control systems. After the alarm is issued, it can neither automatically cut off the main circuit power supply of the battery to prevent the continuous release of energy, nor initiate active heat dissipation or fire extinguishing measures. As a result, the battery remains in a dangerous state after the warning, making it difficult to effectively curb the deterioration of thermal runaway and truly unable to achieve emergency treatment of battery safety hazards.

[0004] Therefore, in order to solve the above problems, an electric vehicle battery thermal runaway warning and fire extinguishing device is proposed. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention provides an electric vehicle battery thermal runaway warning and fire extinguishing device with improved adaptability and ease of use. This device addresses the significant limitations of these devices in their warning functions. Most devices only provide basic audio and visual alarms. When a temperature sensor detects an anomaly, they simply flash lights and piercing beeps to indicate the risk, lacking a precise assessment of the degree of thermal runaway risk. Due to a lack of multi-sensor data fusion analysis and intelligent algorithms, it is impossible to predict the development of thermal runaway. Furthermore, the warning system lacks effective linkage with the battery management and vehicle control systems. After an alarm is issued, the system neither automatically shuts off the battery's main circuit power to prevent continued energy release nor initiates active cooling or fire extinguishing measures. This results in the battery remaining in a critical state even after the warning is issued, making it difficult to effectively curb the progression of thermal runaway and effectively addressing battery safety hazards.

[0006] The technical solution adopted by the present invention to solve its technical problems is: it includes a protective component, an early warning heat dissipation component is installed inside the protective component, and a fire extinguishing component is installed on the side of the early warning heat dissipation component; the adjustable display component includes a bottom support frame, the bottom support frame is internally rotatably connected to the bottom rotating rod, and the top of the bottom rotating rod is fixedly connected to the bottom heat dissipation fan, a temperature sensor is provided on the side of the bottom heat dissipation fan, and a power supply is provided on the top of the temperature sensor, a warning light is provided on the top of the power supply, and a motor is provided on the side of the power supply, the top of the motor is fixedly connected to a worm, and a worm wheel is engaged with the side of the worm, the inside of the worm wheel is fixedly connected to the top rotating rod, and the outside of the top rotating rod is rotatably connected to the top support frame, and the top of the top rotating rod is fixedly connected to the top heat dissipation fan.

[0007] Preferably, the motor forms a transmission structure through a worm, a worm wheel, a top rotating rod and a top heat dissipation fan, and the top heat dissipation fan forms a rotation structure through a top rotating rod and a top support frame.

[0008] Preferably, the bottom rotating rod and the bottom heat dissipation fan are integrated, and the bottom heat dissipation fan forms a rotating structure with the bottom supporting frame through the bottom rotating rod.

[0009] Preferably, the power supply is electrically connected to the temperature sensor, and the temperature sensor is electrically connected to the warning light.

[0010] Preferably, the fire extinguishing assembly includes a fire extinguishing medium storage container, a connecting pipe is fixedly connected to the side of the fire extinguishing medium storage container, and the end of the connecting pipe is fixedly connected to a booster pump, and a connecting line is fixedly connected to the side of the booster pump, the top of the booster pump is fixedly connected to a liquid outlet pipe, and the outer wall of the liquid outlet pipe is fixedly connected to a nozzle.

[0011] Preferably, the fire extinguishing medium storage container is connected to the booster pump via a connecting pipe, and the booster pump is electrically connected to the temperature sensor via a connecting line.

[0012] Preferably, the booster pump forms a communication structure with the nozzle through the liquid outlet pipe, and the nozzles are arranged at equal intervals with respect to the outer wall of the liquid outlet pipe.

[0013] Preferably, the protective assembly includes a protective cabinet, one side of the protective cabinet is fixedly connected to a hinge, the other side of the hinge is fixedly connected to a cabinet door, and the top of the cabinet door is fixedly connected to a buckle, the other side of the protective cabinet is fixedly connected to a metal shell, and a spring is provided inside the metal shell, and the top of the spring is fixedly connected to a rod.

[0014] Preferably, the cabinet door forms a rotating structure with the protective cabinet through a hinge, and the material of the cabinet door is set to high-temperature resistant PC.

[0015] Preferably, the cabinet door and the buckle are integrated, and the buckle and the insertion rod form a snap-fit structure, and the insertion rod forms an elastic structure with the metal shell through a spring.

[0016] The present invention is beneficial in that:

[0017] 1. By incorporating a warning and heat dissipation component, the present invention features an ingenious structural design for the electric vehicle battery thermal runaway warning and fire extinguishing device, offering significant advantages in several areas. Regarding the coordinated warning and heat dissipation, the warning and heat dissipation component houses a temperature sensor electrically connected to the power supply and warning light, enabling real-time monitoring of battery temperature. Any abnormal temperature condition immediately triggers the warning light, providing a timely warning. Simultaneously, the bottom heat dissipation fan rotates with the bottom support frame via a bottom rotating rod, while the top heat dissipation fan rotates via a transmission structure comprised of a motor, worm, worm gear, and top rotating rod. This bidirectional heat dissipation design effectively accelerates air circulation around the battery pack, lowering battery temperature and mitigating the risk of thermal runaway at the source. In terms of component layout and functional integration, the protective component integrates both the warning and heat dissipation components within the protective component, creating a compact layout that saves space and facilitates interoperability between components. When the warning and heat dissipation component detects a serious risk of thermal runaway, the fire extinguishing component rapidly responds and extinguishes any fire. This modular and interconnected structural design not only improves the device's integration and reliability but also simplifies installation and maintenance, providing comprehensive and efficient protection for electric vehicle battery safety.

[0018] 2. The present invention is provided with a fire extinguishing component, which has great advantages in structural design and can effectively improve the efficiency and reliability of fire extinguishing. In terms of fire extinguishing medium transmission, the fire extinguishing medium storage container is connected to the booster pump through a connecting pipe. This design ensures that the fire extinguishing medium can flow stably and smoothly from the storage container to the booster pump. The booster pump further pressurizes the fire extinguishing medium so that it is transported to the nozzle through the liquid outlet pipe in a high-pressure state, ensuring that the fire extinguishing medium has sufficient power and speed when spraying, can quickly cover the fire source, and improve the timeliness of fire extinguishing. In terms of the linkage response mechanism, the booster pump is electrically connected to the temperature sensor through a connecting line, realizing a deep linkage between early warning and fire extinguishing. When the temperature sensor detects an abnormal battery temperature and reaches the preset thermal runaway threshold, it will immediately send a signal to the boost pump to start the boost pump. Without manual intervention, the fire extinguishing process is automatically triggered, greatly shortening the response time from early warning to fire extinguishing and reducing the risk of fire spread. In addition, the nozzles are arranged at equal intervals on the outer wall of the liquid outlet pipe, so that the fire extinguishing medium can be sprayed evenly in all directions, forming a large area with no dead angle coverage. No matter which part of the battery pack has a thermal runaway fire, it can be quickly covered and extinguished by the fire extinguishing medium, which significantly enhances the adaptability of the fire extinguishing component to different fire source locations and the fire extinguishing effect, providing a solid guarantee for the safety of electric vehicle batteries.

[0019] 3. The present invention is provided with a protective component, and the protective component of the device takes into account both safety and practicality in its structural design, which has significant advantages. In terms of protective performance, the protective cabinet uses a cabinet door made of high-temperature resistant PC material. The PC material has good flame retardancy and mechanical strength, which can effectively resist the high temperature and flames generated by thermal runaway of the battery, prevent the fire from spreading to the outside of the device, and at the same time protect the internal early warning heat dissipation components and fire extinguishing components from being damaged by high temperature, ensuring the continuous and stable operation of the device. In terms of opening and closing convenience, the cabinet door forms a rotating structure with the protective cabinet through hinges. This design allows the cabinet door to be opened and closed flexibly, making it convenient for staff to install, debug, maintain and inspect the internal components. When it is necessary to operate the device, the cabinet door can be easily opened to access the various internal components. After the operation is completed, the cabinet door can be conveniently closed to restore the protective state of the device. In terms of fixed stability, the cabinet door and the buckle are integrated, the buckle and the plug rod form a snap-fit structure, and the plug rod forms an elastic structure with the metal shell through a spring. When closing the door, the buckle and the rod engage tightly, and the spring's elastic force ensures a secure engagement, preventing the door from accidentally opening due to vibrations during driving, thus ensuring the safety of the device's internal components. This elastic locking structure also makes opening the door convenient: simply applying a certain amount of external force to overcome the spring force disengages the buckle and rod, allowing the door to open, achieving both stability and ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic cross-sectional structural diagram of the present invention as a whole;

[0022] Figure 2 This is a schematic diagram of the overall rear view of the opened structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the early warning heat dissipation component of the present invention;

[0024] Figure 4 Schematic diagram of the three-dimensional structure of the fire extinguishing assembly of the present invention;

[0025] Figure 5 This is a schematic diagram of the open structure of the protective component of the present invention.

[0026] In the figure: 1. Early warning heat dissipation component; 2. Fire extinguishing component; 3. Protection component; 101. Bottom support frame; 102. Bottom rotating rod; 103. Bottom cooling fan; 104. Temperature sensor; 105. Power supply; 106. Warning light; 107. Top cooling fan; 108. Top support frame; 109. Worm gear; 110. Worm; 111. Motor; 112. Top rotating rod; 201. Fire extinguishing medium storage container; 202. Connecting pipe; 203. Booster pump; 204. Connecting line; 205. Liquid outlet pipe; 206. Nozzle; 301. Protection cabinet; 302. Hinge; 303. Cabinet door; 304. Buckle; 305. Metal shell; 306. Spring; 307. Rod. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1 A floating water quality monitoring device is shown, comprising an early warning and heat dissipation component 1, a fire extinguishing component 2, and a protection component 3.

[0030] See also Figures 1 to 5The electric vehicle battery thermal runaway warning and fire extinguishing device shown is characterized in that it includes a protective component 3, an early warning heat dissipation component 1 is installed inside the protective component 3, and a fire extinguishing component 2 is installed on the side of the early warning heat dissipation component 1; the adjustable display component 1 includes a bottom support frame 101, the bottom support frame 101 is internally rotatably connected to a bottom rotating rod 102, and the top of the bottom rotating rod 102 is fixedly connected to a bottom heat dissipation fan 103, a temperature sensor 104 is provided on the side of the bottom heat dissipation fan 103, and a power supply 105 is provided on the top of the temperature sensor 104, a warning light 106 is provided on the top of the power supply 105, and a motor 111 is provided on the side of the power supply 105, a worm 110 is fixedly connected to the top of the motor 111, and a worm gear 1 is engaged with the side of the worm 110 09, the inside of the worm gear 109 is fixedly connected to the top rotating rod 112, and the outside of the top rotating rod 112 is rotatably connected to the top support frame 108, and the top of the top rotating rod 112 is fixedly connected to the top cooling fan 107; the motor 111 forms a transmission structure with the top cooling fan 107 through the worm 110, the worm gear 109, the top rotating rod 112 and the top cooling fan 107, and the top cooling fan 107 forms a rotating structure with the top support frame 108 through the top rotating rod 112; the bottom rotating rod 102 and the bottom cooling fan 103 are integrated, and the bottom cooling fan 103 forms a rotating structure with the bottom support frame 101 through the bottom rotating rod 102; the power supply 105 is electrically connected to the temperature sensor 104, and the temperature sensor 104 is electrically connected to the warning light 106.

[0031] See also Figure 4 The figure shows an electric vehicle battery thermal runaway warning and fire extinguishing device, in which the fire extinguishing component 2 includes a fire extinguishing medium storage container 201, a connecting pipe 202 is fixedly connected to the side of the fire extinguishing medium storage container 201, and the end of the connecting pipe 202 is fixedly connected to the booster pump 203, and the side of the booster pump 203 is fixedly connected to the connecting line 204, the top of the booster pump 203 is fixedly connected to the liquid outlet pipe 205, and the outer wall of the liquid outlet pipe 205 is fixedly connected to the nozzle 206; the fire extinguishing medium storage container 201 is connected to the booster pump 203 through the connecting pipe 202, and the booster pump 203 is electrically connected to the temperature sensor 104 through the connecting line 204; the booster pump 203 is connected to the nozzle 206 through the liquid outlet pipe 205, and the nozzles 206 are arranged at equal intervals about the outer wall of the liquid outlet pipe 205.

[0032] See also Figure 5The electric vehicle battery thermal runaway warning and fire extinguishing device shown in the figure includes a protective component 3 including a protective cabinet 301, a hinge 302 fixedly connected to one side of the protective cabinet 301, and a cabinet door 303 fixedly connected to the other side of the hinge 302, and a buckle 304 fixedly connected to the top of the cabinet door 303, and a metal shell 305 fixedly connected to the other side of the protective cabinet 301, and a spring 306 is provided inside the metal shell 305, and a rod 307 fixedly connected to the top of the spring 306; the cabinet door 303 forms a rotating structure with the protective cabinet 301 through the hinge 302, and the material of the cabinet door 303 is set to high-temperature resistant PC; the cabinet door 303 and the buckle 304 are integrated, and the buckle 304 and the rod 307 form a snap-fit structure, and the rod 307 forms an elastic structure with the metal shell 305 through the spring 306.

[0033] Working Principle: Throughout the entire operation of the device, the protective assembly 3 serves as the foundational support unit and plays a vital role. The protective cabinet 301 utilizes a high-strength frame structure, providing a stable mounting and support environment for the internal early warning and heat dissipation assembly 1 and the fire extinguishing assembly 2. The cabinet door 303 is constructed of high-temperature resistant PC material, which offers excellent flame retardancy and mechanical strength, capable of withstanding high temperatures and certain external impacts. The cabinet door 303 is pivotally connected to the protective cabinet 301 via hinges 302. Made of stainless steel, the hinges offer high wear and corrosion resistance, ensuring flexible opening and closing. When the cabinet door 303 is closed, the integrated latch 304 at its top precisely engages with the rod 307 at the top of the spring 306 within the metal housing 305. The spring 306 has a specific elastic modulus, providing a stable spring force that secures the rod 307 to the latch 304. This prevents the cabinet door 303 from accidentally opening due to vehicle vibration while in motion, creating a safe and stable operating environment for the internal components.

[0034] The early warning heat dissipation assembly 1 is the core component for early detection and initial heat dissipation of battery thermal runaway. The bottom support frame 101 is constructed of aluminum alloy, offering lightweight and high strength. It features precise bearing mounting slots. The bottom rotating rod 102 is pivotally connected to the bottom support frame 101 via high-precision bearings. This connection effectively reduces rotational friction and improves the smoothness of rotation of the bottom rotating rod 102. The bottom rotating rod 102 is integrated with the bottom cooling fan 103. The fan blades of the bottom cooling fan 103 utilize aerodynamic design, generating a high air volume during rotation to provide basic cooling for the battery. The temperature sensor 104, mounted on the side of the bottom cooling fan 103, utilizes a high-precision thermistor temperature sensor. It features a fast response time of less than 1s and a high measurement accuracy of ±0.1°C, enabling real-time and accurate monitoring of battery temperature changes. The temperature sensor 104 is electrically connected to the power supply 105 via high-temperature-resistant shielded cable, which effectively prevents external electromagnetic interference and ensures the accuracy and stability of temperature signal transmission. When the temperature sensor 104 detects that the battery temperature exceeds the preset normal range, it will immediately transmit an electrical signal to the power supply 105. After receiving the signal, the power supply 105 triggers the warning light 106 on its top to light up. The warning light 106 uses a high-brightness LED light, emitting a striking red light and a continuous beeping sound to remind the vehicle user to pay attention to abnormal battery temperature.

[0035] At the same time, the motor 111 on the side of the power supply 105 starts. The motor 111 is a brushless DC motor with the advantages of high efficiency, long life and low noise. The worm 110 fixedly connected to the top of the motor 111 starts to rotate. The worm 110 is precisely meshed with the worm gear 109. The transmission ratio of the two is precisely designed to convert the high-speed rotation of the motor 111 into a low-speed, high-torque rotation of the worm gear 109. The top rotating rod 112 fixedly connected to the inside of the worm gear 109 rotates in the top support frame 108. The top support frame 108 is also made of aluminum alloy and is provided with a guide sleeve adapted to the top rotating rod 112 to ensure the stability of the rotation of the top rotating rod 112. The top cooling fan 107 fixedly connected to the top of the top rotating rod 112 starts to work. The top cooling fan 107 and the bottom cooling fan 103 form a two-way cooling airflow up and down, which greatly enhances the heat dissipation effect. The motor 111 forms a stable transmission structure through the worm 110, the worm wheel 109, the top rotating rod 112 and the top cooling fan 107, thereby achieving efficient heat dissipation, reducing the battery temperature as much as possible, and avoiding further deterioration of thermal runaway.

[0036] If the battery temperature continues to rise and reaches the preset thermal runaway threshold, the temperature sensor 104 will send a start signal to the booster pump 203 in the fire extinguishing component 2 through the connecting line 204. The fire extinguishing medium storage container 201 is made of high-strength stainless steel, has good sealing and corrosion resistance, and can safely store the fire extinguishing medium. The fire extinguishing medium storage container 201 forms a connecting structure with the booster pump 203 through the connecting pipe 202. The connecting pipe 202 is made of a pressure-resistant rubber tube with a steel wire braided layer inside to enhance its pressure resistance and ensure that the fire extinguishing medium can flow smoothly from the storage container 201 to the booster pump 203. After receiving the signal, the booster pump 203 starts immediately, and the impeller inside it rotates at high speed to pressurize the fire extinguishing medium so that the fire extinguishing medium obtains sufficient pressure and flow rate. The pressurized fire extinguishing medium is transported to the nozzles 206 arranged at equal intervals on the outer wall through the liquid outlet pipe 205. The liquid outlet pipe 205 is made of stainless steel and has high strength and corrosion resistance. The specially designed nozzles 206 atomize the fire extinguishing medium into fine particles, increasing the contact area between the fire extinguishing medium and the fire source, thereby improving fire extinguishing efficiency. The nozzles 206 are evenly distributed on the outer wall of the liquid outlet pipe 205, fully covering the area of the battery pack where thermal runaway may occur. They rapidly spray the fire extinguishing medium to cover the fire source, extinguishing the fire promptly and effectively controlling its spread.

[0037] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. An electric vehicle battery thermal runaway warning and fire extinguishing device, characterized by: It comprises a protection component (3), wherein an early warning heat dissipation component (1) is installed inside the protection component (3), and a fire extinguishing component (2) is installed on the side of the early warning heat dissipation component (1); The adjustable display assembly (1) comprises a bottom support frame (101), the bottom support frame (101) is internally rotatably connected to a bottom rotating rod (102), and the top of the bottom rotating rod (102) is fixedly connected to a bottom cooling fan (103), a temperature sensor (104) is provided on the side of the bottom cooling fan (103), and a power supply (105) is provided on the top of the temperature sensor (104), and a warning light (105) is provided on the top of the power supply (105). 06), and a motor (111) is provided on the side of the power supply (105), the top of the motor (111) is fixedly connected to a worm (110), and the side of the worm (110) is meshed with a worm wheel (109), the inside of the worm wheel (109) is fixedly connected to a top rotating rod (112), and the outside of the top rotating rod (112) is rotatably connected to a top support frame (108), and the top of the top rotating rod (112) is fixedly connected to a top cooling fan (107).

2. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 1, characterized in that: The motor (111) forms a transmission structure through a worm (110), a worm wheel (109), a top rotating rod (112) and a top heat dissipation fan (107), and the top heat dissipation fan (107) forms a rotation structure through the top rotating rod (112) and a top support frame (108).

3. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 1, characterized in that: The bottom rotating rod (102) and the bottom cooling fan (103) are integrated, and the bottom cooling fan (103) forms a rotating structure through the bottom rotating rod (102) and the bottom supporting frame (101).

4. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 1, characterized in that: The power supply (105) is electrically connected to the temperature sensor (104), and the temperature sensor (104) is electrically connected to the warning light (106).

5. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 1, characterized in that: The fire extinguishing assembly (2) comprises a fire extinguishing medium storage container (201), a connecting pipe (202) is fixedly connected to the side of the fire extinguishing medium storage container (201), and the end of the connecting pipe (202) is fixedly connected to a booster pump (203), and a connecting line (204) is fixedly connected to the side of the booster pump (203), a liquid outlet pipe (205) is fixedly connected to the top of the booster pump (203), and a nozzle (206) is fixedly connected to the outer wall of the liquid outlet pipe (205).

6. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 5, characterized in that: The fire extinguishing medium storage container (201) is connected to the booster pump (203) via a connecting pipe (202), and the booster pump (203) is electrically connected to the temperature sensor (104) via a connecting line (204).

7. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 5, characterized in that: The booster pump (203) forms a communication structure with the nozzle (206) through the liquid outlet pipe (205), and the nozzles (206) are arranged at equal intervals with respect to the outer wall of the liquid outlet pipe (205).

8. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 1, characterized in that: The protection assembly (3) comprises a protection cabinet (301), one side of the protection cabinet (301) is fixedly connected to a hinge (302), the other side of the hinge (302) is fixedly connected to a cabinet door (303), and the top of the cabinet door (303) is fixedly connected to a buckle (304), the other side of the protection cabinet (301) is fixedly connected to a metal shell (305), a spring (306) is provided inside the metal shell (305), and the top of the spring (306) is fixedly connected to a plug rod (307).

9. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 8, characterized in that: The cabinet door (303) forms a rotating structure with the protective cabinet (301) via a hinge (302), and the material of the cabinet door (303) is set to be high-temperature resistant PC.

10. The electric vehicle battery thermal runaway warning and fire extinguishing device according to claim 8, characterized in that: The cabinet door (303) and the buckle (304) are integrated, and the buckle (304) and the insertion rod (307) form a snap-fit structure, and the insertion rod (307) forms an elastic structure with the metal shell (305) through the spring (306).

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