Automatic fire extinguishing device after automatic induction of thermal runaway of battery of new energy vehicle

Abstract

The invention discloses an automatic fire extinguishing device for automatically sensing thermal runaway of a battery of a new energy vehicle. The automatic fire extinguishing device comprises a base, a control box, a fire blanket body, a release assembly and a fire detection probe. The whole base is of a frame-shaped structure and is fixed to a preset position of a vehicle, and a fixed joint strip is arranged on the top face of the base. The fire blanket body is rectangular and comprises a base cloth layer, a coating and a heat insulation filling layer, a positioning strip is arranged on the top face, and heavy drooping blocks are arranged on the two sides. The release assembly comprises a fixed seat, a splicing seat, an electromagnet, a melt strip and a joint block, and the electromagnet adsorbs the heavy drooping block through magnetic force so as to store the fire blanket; the fire behavior detection probe comprises a spectrum sensor, a smoke sensor and an infrared temperature sensor and is used for monitoring fire behavior in real time. When a fire occurs, the control box receives a detection signal to cut off a power supply of the electromagnet, or the melt strip melts at a high temperature to actively cut off power, so that the weight drop block drops to pull the fire blanket body to be completely unfolded and cover a fire area, and the fire is inhibited by blocking oxygen.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic fire extinguishing, and in particular to an automatic fire extinguishing device that automatically senses thermal runaway of a battery of a new energy vehicle. Background Art

[0002] New energy vehicles are becoming an important development direction for future transportation due to their low-carbon and environmentally friendly characteristics. However, due to the high energy density of new energy vehicle power batteries, thermal runaway may occur during operation or charging, causing the local temperature of the battery to rise rapidly, and even causing fire or explosion, posing great safety hazards to the vehicle and passengers.

[0003] In the existing technology, the fire caused by thermal runaway of new energy vehicle batteries is dealt with mainly in the following ways: first, through the on-board fire fighting system, including spraying fire extinguishing agent or coolant to reduce the battery temperature; second, through the monitoring system to detect the temperature, voltage, current and other parameters inside the battery to achieve early warning of the fire. However, these technologies have certain shortcomings. For example, the system for spraying fire extinguishing agent or coolant is highly complex, occupies a large space in the car, and has a high maintenance cost; although the monitoring system can provide early warning, it lacks the ability to respond quickly to sudden fires. When the fire spreads, it may not be able to effectively suppress the fire source, which will cause greater danger.

[0004] In addition, some technologies use fire blankets as an emergency fire extinguishing method, but the release method of existing fire blankets is mostly a single manual trigger, which is difficult to adapt to the complex scenarios of sudden battery fires and cannot achieve fully automatic response. At the same time, the deployment process of the fire blanket is inefficient and prone to incomplete coverage, thus affecting the fire extinguishing effect. In addition, the existing fire blanket lacks a reliable secondary release mechanism, which makes it easy for the fire to spread due to incomplete release during use, and cannot meet the needs of efficient fire extinguishing of new energy vehicles.

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides an automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries, which can quickly and reliably release a fire blanket to cover the fire source by combining fire detection, automatic triggering, and passive release. The device not only effectively solves the problems of slow response speed and incomplete release of existing fire protection equipment, but also improves the versatility and maintainability of the system through modular design, and increases the safety redundancy of the system through high-temperature fusing technology, significantly improving the efficiency and safety of emergency fire handling in new energy vehicles. Summary of the invention

[0006] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0007] To this end, the technical solution adopted by the present invention is: an automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries, including a base, a control box, a fire blanket body, a release assembly and a fire detection probe. The base is a frame-shaped structure as a whole, fixed at a predetermined position of the new energy vehicle, and its top surface is provided with two fixed strips arranged symmetrically about the center line of the base; the control box is fixed on one side of the base, and its input end is electrically connected to an emergency button; the fire blanket body is rectangular, including a base cloth layer, a coating layer and a heat-insulating filling layer, and its two side edges are provided with weight blocks, and a positioning strip is fixed on the top surface, and the two sides of the fire blanket body are disc-shaped or reel-shaped; the release assembly includes a fixed seat, a splicing block, a splicing seat, an electromagnet, a melting strip and a joint block, the joint block is fixed to the bottom surface of the splicing seat through the melting strip, and the splicing block is used to realize the splicing connection of several fixed seats and the splicing seat; the fire detection probe is arranged at the four corners of the bottom surface of the base for real-time perception of the fire.

[0008] In a possible implementation, the positioning strip is a flexible permanent magnetic strip structure, and the fixing strip is fixed to the top surface of the base and is used to absorb the positioning strip so that the fire blanket body is positioned and adhered to the bottom surface of the base.

[0009] In a possible implementation, the release assembly is formed into a straight line by splicing adjacent fixing seats with a plurality of splicing blocks, fixed to the inner side of the base, and arranged symmetrically about the center line of the base; the splicing seat is detachably mounted on the surface of the fixing seat through the splicing blocks.

[0010] In a possible implementation, the weight blocks on both sides of the fire blanket body are evenly distributed along a straight line and arranged one-to-one with the fixing strips. The weight blocks are fixed to the base by the magnetic force of the electromagnet, and when released, the fire blanket body is pulled down by gravity to unfold freely.

[0011] In a possible implementation, the control box includes a circuit for controlling the on and off of the electromagnet. When the fire detection probe detects an abnormality, the control box receives a signal and cuts off the power supply of the electromagnet, thereby releasing the fire blanket body.

[0012] In one possible embodiment, the melt strip is a polyethylene sheet structure, on the surface of which electrode strips for accessing the electromagnet power supply are arranged. The thickness of the melt strip is 1-5 mm, and the thickness of the electrode strip is less than 1 mm. Under high temperature conditions, the melt strip melts or the electrode strip melts, both of which cause the electromagnet to lose power, thereby releasing the fire blanket body.

[0013] In a possible implementation, the base fabric layer is made of high-silica glass fiber cloth, coated on one side, and the fire blanket body is sewn using high-temperature resistant suture thread, and the base fabric layer is filled with a heat-insulating filling layer.

[0014] In a possible implementation, the fire detection probe includes a spectral sensor, a smoke sensor, and an infrared temperature sensor, which are used to sense the fire in real time and transmit the detection results to the control box; the emergency button is used to manually issue a fire extinguishing command, and the control box cuts off the power supply of the electromagnet after receiving the command to release the fire blanket body.

[0015] In a possible implementation, the base has a built-in independent power supply to ensure that the release assembly can still work normally when the main power supply fails, thereby preventing the fire blanket body from being released by mistake when there is no fire.

[0016] In a possible implementation, a plurality of electromagnets are connected in series to ensure that when any fusion strip or electrode strip is melted, all electromagnets are de-energized synchronously, thereby achieving synchronous release of the fire blanket body.

[0017] Based on the above technical solution, the automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries of the present invention detects abnormal fire through the fire detection probe, triggers the control box to cut off the power supply of the electromagnet, or actively cuts off the power through the melting of the melt strip under high temperature, thereby releasing the fire blanket body, achieving complete coverage of the fire point, quickly blocking oxygen and inhibiting the spread of the fire. The present invention ensures that the release process of the fire blanket body is efficient and stable through adsorption, heavy vertical block traction and secondary release design, has automatic, manual and passive release functions, adapts to a variety of fire scenarios, and significantly improves the emergency handling efficiency and safety of thermal runaway fires of new energy vehicle batteries.

[0018] The beneficial effects achieved by the present invention are: 1. In the present invention, through the dual mechanism of automatic induction and passive release, the fire blanket body can be quickly released and completely cover the fire area after detecting the fire. The gravity pulling of the weight block and the secondary release design of the fixed strip and the positioning strip ensure that the fire blanket body can be efficiently deployed, fully cover the fire source, quickly block oxygen, and inhibit the spread of fire.

[0019] 2. In the present invention, the release component is designed with an electromagnet and a melting strip, combined with the fire detection probe and the control box, and has automatic, manual and high-temperature passive release functions. It can adapt to different fire scenes and ensure the reliable operation of the system. Even if the probe or circuit is damaged, the fire blanket can still be released by high-temperature fusing.

[0020] 3. In the present invention, the release assembly realizes modular splicing connection between the fixing seat and the splicing seat through the splicing block. The structure is simple to install and can be flexibly adjusted according to the requirements of different vehicle models. It has strong versatility and maintainability.

[0021] 4. In the present invention, the melt strip and the connecting block can actively melt the electrode strip or the melt strip body under high temperature, quickly cut off the power supply of the electromagnet, and thus release the fire blanket body. Even in abnormal circumstances (such as damage to the detection probe), it can still effectively respond to sudden fires and ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the installation structure of the release assembly and the fire blanket body according to one embodiment of the present invention; Figure 3 This is a schematic structural diagram of a fire blanket body in a stored state according to an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a release assembly according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the exploded structure of a release component according to an embodiment of the present invention; Figure 6 A schematic diagram of the partial structure of a fire blanket body according to an embodiment of the present invention; Figure 7 The figure is a schematic diagram of a partial cross-section structure of a fire blanket body according to an embodiment of the present invention.

[0023] Reference numerals: 100, base; 110, control box; 120, emergency button; 130, fixed sticker; 200, fire blanket body; 210, weight block; 220, positioning strip; 201, base fabric layer; 202, coating layer; 203, thermal insulation filling layer; 300, release assembly; 310, fixing seat; 311, splicing block; 320, splicing seat; 330, electromagnet; 321, melting strip; 322, joint block; 400, fire detection probe. DETAILED DESCRIPTION

[0024] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0026] An automatic fire extinguishing device for automatically sensing thermal runaway of a new energy vehicle battery provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] In a specific embodiment of the present invention, Figures 1 to 7As shown, an automatic fire extinguishing device for automatically sensing thermal runaway of a new energy vehicle battery includes a base 100, a control box 110, a fire blanket body 200, a release assembly 300 and a fire detection probe 400.

[0028] The base 100 is a frame-shaped structure as a whole, which is used to install the entire device and is fixed to a predetermined position of the new energy vehicle. The top surface of the base 100 is provided with two fixing strips 130 arranged symmetrically about the center line of the base. In a specific embodiment, the fixing strip 130 and the positioning strip 220 on the top surface of the fire blanket body 200 position the fire blanket body 200 to fit the bottom surface of the base 100 through adsorption. It should be noted that the adsorption force between the fixing strip 130 and the positioning strip 220 must be less than the overall mass of the fire blanket body 200 to ensure that when the fire blanket is released, the weight block 210 can be pulled by gravity to expand the storage area of ​​the fire blanket body 200 after the adsorption force is released, ensuring that the fire blanket body 200 can be smoothly and completely separated from the base 100. In another embodiment, the fixing strip 130 and the positioning strip 220 can use a Velcro structure instead of an adsorption design to achieve the same positioning and release functions.

[0029] The fire blanket body 200 is rectangular and includes a base fabric layer 201, a coating layer 202 and a heat insulating filling layer 203. Several weight blocks 210 are provided on the edges of the two sides of the fire blanket body 200. The weight blocks 210 are evenly distributed along a straight line and arranged one by one with the fixed strips 130. The two sides of the fire blanket body 200 are stored in a disc or roll shape and fixed to the bottom of the base 100. The weight blocks 210 are designed to provide gravity traction during the release process so that the fire blanket body 200 can be smoothly unfolded and cover the fire area. The weight blocks 210 are fixed to the inner side of the base 100 by the magnetic force of the electromagnet 330. It should be noted that the magnetic attraction force of the electromagnet 330 on the weight blocks 210 must be greater than the total mass of the fire blanket body 200 and the weight blocks 210 on both sides to ensure that the fire blanket body 200 can be stably stored under normal conditions and will not accidentally fall off due to vehicle bumps or external forces.

[0030] The release assembly 300 includes a plurality of fixing seats 310, a splicing block 311, a splicing seat 320, an electromagnet 330, a melt strip 321 and a joint block 322. The fixing seat 310 is connected to the splicing seat 320 through the splicing block 311 to realize modular splicing. The structure is simple to install, and the number and position of the fixing seats 310 can be flexibly adjusted according to vehicle requirements. Under normal conditions, the electromagnet 330 is installed on the surface of the joint block 322 and is electrically connected to the power supply through the electrode strip inside the joint block 322. The melt strip 321 is a polyethylene sheet structure, which is used to control the power disconnection of the electromagnet 330 when the surface electrode strip breaks under high temperature melting.

[0031] In a high temperature environment, after the melt strip 321 melts, it can no longer provide support for the electromagnet 330. The electromagnet 330 and the weight block 210 adsorbed thereon fall down by gravity, thereby pulling the fire blanket body 200 to unfold. At the same time, when the melt strip 321 melts, the electrode strips arranged on its surface will also melt due to the high temperature, causing the electromagnet 330 to be powered off, further releasing the fire blanket body 200. The thickness of the electrode strip is designed to be less than 1 mm to ensure rapid melting under high temperature conditions, while ensuring that the overall melting of the melt strip 321 can quickly cut off the power supply of the electromagnet 330, thereby achieving passive release in an emergency.

[0032] In a specific embodiment, when a fire occurs and the fire detection probe 400 detects an abnormality, the fire detection probe 400 transmits a detection signal to the control box 110. After receiving the signal, the control box 110 immediately cuts off the power supply of the electromagnet 330, causing the electromagnet 330 to lose its magnetic force, and the weight block 210 falls, driving the fire blanket body 200 to unfold, and finally covering the fire point to extinguish the fire.

[0033] In addition, in abnormal situations, such as when the fire detection probe 400 is damaged or the circuit fails, if the fire spreads rapidly, the device can rely on the active melting of the melt strip 321 in a high temperature environment to melt the electrode strip, thereby cutting off the power supply of the electromagnet 330 and automatically releasing the fire blanket body 200. This design effectively solves the reliability problem in fire handling and ensures that the fire extinguishing device can operate normally in various emergency situations.

[0034] The present invention ensures the stable storage of the fire blanket body 200 under normal conditions and the reliable release under emergency conditions through the adsorption design of the fixing strip 130 and the positioning strip 220, combined with the gravity traction of the weight block 210 and the magnetic adsorption of the electromagnet 330; through the high-temperature melting mechanism of the melt strip 321 and the electrode strip, the distributed release is effectively realized, so that the fire blanket body 200 is fully unfolded, which significantly improves the fire extinguishing efficiency and the reliability of the device, and is suitable for various fire scenarios such as thermal runaway of new energy vehicle batteries.

[0035] The working principle and use process of the present invention: The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries of the present invention can quickly respond when thermal runaway or fire occurs in new energy vehicle batteries through the cooperation of the fire detection probe 400, the control box 110, the release assembly 300, the fire blanket body 200 and the associated adsorption and triggering mechanisms, and automatically release the fire blanket to cover the fire source and suppress the spread of the fire. The working principle and use process of the present invention are described in detail in combination with three scenarios: 1. Scenario 1: Normal detection and manually triggered fire extinguishing process In the normal use state of the present invention, the fire blanket body 200 is stably attached to the bottom surface of the base 100 by the adsorption effect of the fixing strip 130 and the positioning strip 220. At the same time, the weight block 210 is fixed by the magnetic force of the electromagnet 330 to ensure that the fire blanket body 200 is stably stored. At this time, the fire detection probe 400 monitors the fire data around the vehicle in real time and transmits the signal to the control box 110.

[0036] When the driver or passenger of a new energy vehicle discovers a fire, the fire extinguishing device can be manually triggered by pressing the emergency button 120. The specific operation process is as follows: The driver presses the emergency button 120, and the signal is transmitted to the control box 110; The control box 110 cuts off the power supply of the electromagnet 330, so that the electromagnet 330 loses its magnetic force; After losing the restraint of magnetic force, the weighted hanging block 210 falls due to gravity, pulling the fire blanket body 200 to unfold freely; As the fire blanket body 200 is fully unfolded, the gravity pulling action of the weight block 210 releases the adsorption force between the fixing strip 130 and the positioning strip 220, and the fire blanket body 200 is completely separated from the base 100 and covers the fire point; After covering the fire source, the heat insulating filling layer 203 of the fire blanket body 200 isolates oxygen and prevents the high temperature flame from spreading, thereby completing the fire extinguishing.

[0037] Advantages analysis: This process relies on quick human judgment and manual triggering, and is suitable for emergency firefighting operations when a fire is discovered in the early stages to prevent the fire from getting worse. The fire blanket is released smoothly and covers the entire area through the coordinated design of adsorption force, gravity of the weighted drop block, and electromagnet.

[0038] 2. Scenario 2: Automatic detection and triggering of fire extinguishing process When the battery of a new energy vehicle is in thermal runaway or a fire occurs around the vehicle, the fire detection probe 400 will automatically sense changes in environmental parameters such as smoke, infrared temperature anomalies or spectral characteristics, and transmit signals to the control box 110 to start the automatic release process of the fire extinguishing device. The specific operation process is as follows: The fire detection probe 400 detects abnormal parameters, such as increased smoke density, infrared temperature exceeding a threshold, etc., and transmits the signal to the control box 110; After receiving the signal, the control box 110 immediately cuts off the power supply of the electromagnet 330, so that the electromagnet 330 loses its magnetic force; After losing the magnetic restraint, the weighted drop block 210 falls due to gravity, pulling the fire blanket body 200 to unfold freely; During the unfolding process of the fire blanket body 200, the gravity of the weight block 210 gradually releases the adsorption effect between the fixing strip 130 and the positioning strip 220 until the fire blanket body 200 is completely separated from the base 100; The fire blanket body 200 eventually covers the fire point, isolates oxygen through the heat-insulating filling layer 203, and quickly suppresses the spread of fire.

[0039] Advantages analysis: The process completely relies on automatic detection and response mechanisms, without the need for human intervention. It is suitable for scenarios where fires occur quickly and cannot be handled manually in time, such as spontaneous combustion of an unmanned vehicle or thermal runaway of the battery. The multi-sensor design of the fire detection probe uses smoke, infrared temperature and spectrum sensors to ensure the accuracy and sensitivity of detection, combined with the automatic control mechanism of electromagnet power failure, to achieve rapid response and precise fire extinguishing.

[0040] 3. Scenario 3: Passive release fire extinguishing process in high temperature environment In some extreme cases, such as when a battery explodes or a fire spreads suddenly and rapidly, resulting in damage to the fire detection probe 400, or when the control box 110 and the circuit cannot work properly, the device will rely on the high-temperature melting mechanism of the melt strip 321 to achieve passive release of the fire blanket body 200. The specific operation process is as follows: Under the action of high temperature fire, the melt strip 321 gradually melts and loses its supporting function for the electromagnet 330; The electrode strips arranged on the surface of the melt strip 321 are quickly separated due to the deformation and pulling of the melt strip 321, or the electrode strips are melted due to the high temperature environment, causing the electromagnet 330 to be powered off; As the electromagnet 330 loses its magnetic force, the weight block 210 falls due to gravity, pulling the fire blanket body 200 to unfold freely; During the unfolding process of the fire blanket body 200, the weighted vertical block 210 gradually releases the adsorption force between the fixing strip 130 and the positioning strip 220, and finally the fire blanket body 200 is completely separated from the base 100 and covers the fire point; After covering the fire source, the fire blanket body 200 isolates oxygen and suppresses the spread of fire, thus completing the fire extinguishing operation.

[0041] Detailed description of the melting mechanism: The melt strip 321 is a polyethylene sheet structure with a thickness of 1-5 mm, and an electrode strip with a thickness of less than 1 mm is arranged on the surface. When the melt strip 321 is subjected to high temperature, first, the melt strip body gradually melts, causing the electromagnet 330 to fall due to loss of support; secondly, the surface electrode strip melts due to the high temperature environment, directly cutting off the power supply of the electromagnet 330. This dual high temperature response mechanism ensures that the fire extinguishing device can still spontaneously trigger the fire extinguishing process through the fire environment even in extreme cases where the detection device or circuit fails, thereby ensuring the reliability of the system.

[0042] Advantages analysis: This process relies entirely on passive triggering and is suitable for extreme situations such as rapid deterioration of fire conditions, damage to the detection system or power outages. The design of the melt strip and electrode strip ensures that the system can effectively release the fire blanket to prevent the fire from spreading further even without human intervention and electronic control failure.

[0043] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An automatic fire extinguishing device that automatically senses thermal runaway of new energy vehicle batteries, characterized in that: include: A base (100) is in a frame-shaped structure as a whole and is fixed at a predetermined position of a new energy vehicle; the top surface of the base (100) is provided with two fixing strips (130) arranged symmetrically about the center line of the base (100); a control box (110) is fixed to one side of the base (100), and an input end thereof is electrically connected to an emergency button (120); a fire blanket body (200) is in a rectangular shape and comprises a base fabric layer (201), a coating layer (202) and a heat insulating filling layer (203), and weight blocks (210) are provided on the edges of both sides thereof, and a positioning strip (220) is fixed to the top surface , with both sides of the base (100) being stored in a disc-shaped or roll-shaped manner; a release assembly (300), comprising a fixing seat (310), a splicing block (311), a splicing seat (320), an electromagnet (330), a melting strip (321) and a joining block (322), wherein the joining block (322) is fixed to the bottom surface of the splicing seat (320) via the melting strip (321), and the splicing block (311) is used to realize the splicing connection between a plurality of fixing seats (310) and the splicing seat (320); and a fire detection probe (400), arranged at the four corners of the bottom surface of the base (100), and used to sense the fire in real time.

2. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The positioning strip (220) is a flexible permanent magnetic strip structure, and the fixing strip (130) is fixed to the top surface of the base (100) and is used to absorb the positioning strip (220) so that the fire blanket body (200) is positioned and adhered to the bottom surface of the base (100).

3. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The release assembly (300) is formed into a straight line by splicing adjacent fixing seats (310) using a plurality of splicing blocks (311), fixed to the inner side of the base (100), and arranged symmetrically about the center line of the base (100); the splicing seat (320) is detachably mounted on the surface of the fixing seat (310) via the splicing blocks (311).

4. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The weight blocks (210) on both sides of the fire blanket body (200) are evenly distributed along a straight line and arranged one-to-one with the fixing strips (130); the weight blocks (210) are fixed to the base (100) by magnetic attraction of the electromagnet (330), and when released, the fire blanket body (200) is pulled down by gravity to freely unfold.

5. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The control box (110) comprises a circuit for controlling the on and off of the electromagnet (330); when the fire detection probe (400) detects an abnormality, the control box (110) receives a signal and cuts off the power supply of the electromagnet (330), thereby releasing the fire blanket body (200).

6. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The melt strip (321) is a polyethylene sheet structure, and an electrode strip for connecting the power supply of the electromagnet (330) is arranged on its surface. The thickness of the melt strip (321) is 1-5 mm, and the thickness of the electrode strip is less than 1 mm. Under high temperature conditions, the melt strip (321) melts or the electrode strip melts, which causes the electromagnet (330) to be powered off, thereby releasing the fire blanket body (200).

7. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The base fabric layer (201) is made of high-silica glass fiber cloth, coated with a coating (202) on one side, and the fire blanket body (200) is sewn using high-temperature resistant suture thread, and the base fabric layer (201) is filled with a heat-insulating filling layer (203).

8. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The fire detection probe (400) comprises a spectrum sensor, a smoke sensor and an infrared temperature sensor, and is used to sense the fire in real time and transmit the detection result to the control box (110); the emergency button (120) is used to manually issue a fire extinguishing command, and the control box (110) cuts off the power supply of the electromagnet (330) after receiving the command, so as to release the fire blanket body (200).

9. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The base (100) has a built-in independent power supply to ensure that the release assembly (300) can still work normally when the main power supply fails, thereby preventing the fire blanket body (200) from being released by mistake when there is no fire.

10. The automatic fire extinguishing device for automatically sensing thermal runaway of new energy vehicle batteries according to claim 1 is characterized in that: The plurality of electromagnets (330) are connected via a series circuit to ensure that when any melt strip (321) or electrode strip is melted, all the electromagnets (330) are powered off synchronously, thereby achieving synchronous release of the fire blanket body (200).

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