Aerogel buffer heat insulation pad for battery module

Abstract

The invention discloses a battery module aerogel buffer heat insulation pad, and relates to the technical field of battery module heat insulation pads, the battery module aerogel buffer heat insulation pad comprises a base pad and buffer gaskets attached to the end faces of the two sides of the base pad, the battery module aerogel buffer heat insulation pad further comprises a pipeline arranged in the base pad, and the pipeline is filled with dry powder; the nozzle is formed in the pipeline; the thermosensitive film covers the nozzle in a sealing manner and is configured to be broken when a preset temperature is reached; the driving device is connected with one end of the pipeline, and the driving device comprises a thermal expansion cavity and a piston piece arranged in the thermal expansion cavity; the self energy of catastrophe is used as a trigger and power source, an external power supply or signal is not depended, the reliability is extremely high, the thermosensitive film and the thermal expansion cavity are both based on the physical phase change principle, the response speed is at the millisecond level, intervention can be performed before large-scale formation of open fire, and thermal runaway is killed in the bud state.

Description

Technical Field

[0001] This invention relates to the field of battery module heat insulation pad technology, and particularly to an aerogel buffer heat insulation pad for battery modules. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage power stations, lithium-ion batteries are widely used due to their high energy density. However, batteries are prone to thermal runaway under conditions such as overcharging, internal short circuits, or mechanical abuse, leading to a sharp rise in temperature and potentially causing fires or even explosions, posing a serious threat to life and property safety. Therefore, thermal management and safety protection technologies for battery modules have become a key research focus in this field. Aerogel materials are considered ideal thermal insulation materials due to their extremely low thermal conductivity. Currently, the industry typically uses aerogel to make thermal insulation pads, which are placed between cells in the battery module or between the cells and the battery pack casing to block the transfer of heat between cells and provide some buffer protection. Existing thermal insulation pads can only slow down the rate of heat spread and cannot actively suppress or extinguish existing fires. Once a cell experiences thermal runaway and generates an open flame, the high-temperature flame will directly impact and eventually burn through the traditional aerogel thermal insulation pad, causing adjacent cells to ignite and resulting in a chain reaction of thermal runaway throughout the entire module.

[0003] To enhance safety, some advanced solutions attempt to integrate fire extinguishing functions into the insulation pad. One known technique involves placing pipes inside the insulation pad and filling them with dry powder extinguishing agent. When the local temperature becomes too high, the pipes melt and rupture, releasing the dry powder and extinguishing the fire. However, the release of dry powder in such solutions often relies on passive diffusion, which lacks sufficient driving force, resulting in limited coverage, uneven coverage, and low fire extinguishing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device that utilizes the energy of the disaster itself as a trigger and power source, does not rely on external power sources or signals, has extremely high reliability, and whose thermistor and thermal expansion cavity are both based on the principle of physical phase change, with a response speed in the millisecond range. It can intervene before large-scale open flames form, nipping thermal runaway in the bud.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an aerogel buffer heat insulation pad for a battery module, comprising a base pad and buffer pads adhered to its two end faces, and further comprising... The pipes are installed inside the base pad and are filled with dry powder. The nozzle is located on the pipe; A heat-sensitive membrane, sealed over the nozzle, is configured to rupture upon reaching a predetermined temperature; A drive unit is connected to one end of the pipe; The driving device includes a thermal expansion cavity and a piston disposed therein; The thermal expansion chamber is configured to generate high-pressure gas when heated, which drives the piston to move and squeeze the dry powder in the pipe out of the nozzle.

[0006] Furthermore, both ends of the pipe are connected to U-shaped bends, and both ends of the pipe are connected to the drive device through the U-shaped bends.

[0007] Furthermore, the front end of the thermal expansion cavity is connected to a U-shaped bend, and an inner ring is provided on the inner wall of the thermal expansion cavity, with one end of the piston fitting against one end of the inner ring.

[0008] Furthermore, the thermal expansion cavity at the other end of the built-in ring is sealed with a phase change working fluid.

[0009] Furthermore, the two ends of the pipe are respectively end a and end b. Each end of a single pipe is connected to a driving device, and the two driving devices are arranged side by side on both sides of the pipe. The thermal expansion end of the upper driving device is aligned with end b of the pipe, and the other end of the upper driving device is connected to end a of the pipe through a U-shaped bend. The thermal expansion end of the lower driving device is aligned with end a of the pipe, and the other end of the lower driving device is connected to end b of the pipe through a U-shaped bend.

[0010] Furthermore, multiple pipes and drive devices are provided, all arranged side by side within the base pad.

[0011] Furthermore, several nozzles are provided, symmetrically arranged side by side on both sides of the pipe.

[0012] Furthermore, a metal insert is provided on the nozzle, and the heat-sensitive film is sealed and fixed on the metal insert around the nozzle by high-temperature resistant epoxy resin.

[0013] Furthermore, a number of heat-conducting fins are arranged in a ring on the outer wall of the thermal expansion cavity.

[0014] The technical effects and advantages of this invention are as follows: This invention utilizes the energy of the disaster itself as a trigger and power source, without relying on external power sources or signals, resulting in extremely high reliability. Both the thermistor and the thermal expansion cavity are based on the principle of physical phase change, with a response speed in the millisecond range. This allows for intervention before large-scale open flames develop, nipping thermal runaway in the bud. The three functions of heat insulation, buffering, and fire extinguishing are seamlessly integrated into a thin-layer component without occupying valuable space within the battery pack. This meets the development requirements of lightweight and high-energy-density electric vehicles. The system has no complex electronic components, few moving parts, and all materials are resistant to high temperatures and aging, with the same lifespan as the battery pack, requiring virtually no maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A; Figure 3 This is a half-sectional view of the base pad structure of the present invention; Figure 4 This is a partial cross-sectional view of the pipeline structure of the present invention; Figure 5 This is a partial sectional view of the driving device of the present invention; Figure 6 This is a schematic diagram of the heat-conducting fin structure of the present invention; Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 8 This is a half-sectional view of the battery casing structure of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of point B; Figure 10 This is a schematic diagram of the sealing plate connection of the present invention.

[0016] In the picture: 1. Base pad; 11. Buffer pad; 12. Sensitive adhesive layer; 13. Battery casing; 14. Heat insulation cavity; 141. Guide plate; 15. Inner plate; 151. Sealing plate; 2. Pipeline; 21. Nozzle; 211. Metal insert; 22. Thermosensitive membrane; 23. U-shaped bend; 3. Drive unit; 31. Thermal expansion cavity; 311. Internal ring; 312. Heat-conducting fins; 32. Piston component. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Refer to Figure 1 - Figure 6This is the first embodiment of the present invention, which provides an aerogel buffer insulation pad for a battery module, including a base pad 1 and buffer pads 11 attached to its two end faces. The base pad 1 is preferably made of aerogel composite material, specifically, it is a flexible felt body made of silica aerogel and ceramic fiber blanket through a needle punching process. The volume ratio of silica aerogel is not less than 60%, and its nanoporous structure can effectively suppress the convective heat transfer of gas molecules and the heat conduction of solids, giving the base pad 1 extremely low thermal conductivity at room temperature and high temperature. The ceramic fiber serves as a skeleton, providing sufficient mechanical strength and flexibility to ensure that the base pad 1 does not undergo structural pulverization and breakage under long-term vibration of the battery pack.

[0019] The thickness of base pad 1 is determined based on the design gap and heat insulation requirements of the battery module.

[0020] Its manufacturing process includes: mixing aerogel powder with ceramic fiber water slurry, wet molding, supercritical drying, and finally molding to a fixed thickness. The base pad 1 has pre-embedded molding pipes 2 inside during the manufacturing process. In addition to heat insulation, the base pad 1 also has excellent flame retardant properties. Even if it is ignited under extreme conditions, it can effectively self-extinguish, without producing molten droplets or contributing flame.

[0021] The buffer pads 11 are fitted onto both end faces of the base pad 1, i.e., the sides facing the battery cell and battery pack casing. The buffer pads 11 are made of an elastic microporous polymer material, such as flame-retardant polyurethane foam, silicone rubber foam, expanded graphite, or polymer composite materials. When the battery cell expands due to charging / discharging or external impact, the buffer pads 11 absorb energy through their elastic deformation, preventing damage to the battery cell or base pad 1 from rigid contact. Their porous structure evenly distributes pressure, preventing stress concentration. The flexibility of the buffer pads 11 ensures proper contact with the battery cell. The tight fit between the surface and the inner wall of the casing reduces the contact thermal resistance. Some of the materials themselves also have good thermal conductivity, which can serve as an auxiliary path for heat conduction to the base pad 1. However, the core heat insulation function is still undertaken by the base pad 1, which fills the gap between the cell and the module, and plays a certain role in damping vibration reduction and dustproof sealing. The buffer pad 11 and the base pad 1 are bonded together by a high-temperature resistant pressure-sensitive adhesive layer 12. The pressure-sensitive adhesive layer 12 has the characteristics of high initial adhesion, strong holding power, wide temperature range, and low volatility, so as to prevent delamination or contamination of the internal environment of the battery in a vacuum environment.

[0022] It also includes a pipe 2 set inside the base pad 1, and the pipe 2 is filled with dry powder. The pipe 2 is arranged along the length or width of the battery module and is responsible for quickly transporting the dry powder. The molding of the pipe 2 is carried out simultaneously with the manufacturing of the base pad 1. In the wet molding stage of aerogel composite material, a soluble or fusible core rod is placed in the blank according to the designed topology. After the base pad 1 is dried and cured, the core rod is removed by heating or dissolving, thereby forming a smooth, continuous and structurally complete cavity pipe 2 inside the base pad 1. This process ensures the integrity of the pipe 2 and the base pad 1 and avoids the strength weakening and sealing problems caused by later slotting and pipe embedding. The inner wall of pipe 2 is surface treated to optimize the flowability of dry powder. Low surface energy materials such as polytetrafluoroethylene are coated on the inner wall of pipe 2 to form a powder-repellent coating, which significantly reduces the adsorption force and static friction between the dry powder and the pipe wall.

[0023] Nozzle 21 is provided on pipe 2. Thermistor 22 is sealed and covered by nozzle 21 and is configured to rupture when a predetermined temperature is reached. Thermistor 22 is preferably a low melting point alloy film with its melting point precisely set at 100℃±5℃. This temperature is higher than the upper limit temperature for normal battery operation, usually ≤60℃, and also higher than the alarm temperature of most BMS, about 80℃. This can effectively prevent false alarms, while being significantly lower than the temperature at which the battery violently erupts due to thermal runaway, thus achieving true early intervention.

[0024] The thermal film 22 is not a single-layer metal foil, but a composite structure. The central layer is a low-melting-point alloy functional layer, and the two sides are covered with thin polymer protective layers to prevent the alloy from being oxidized or scratched during storage. The thermal film 22 is sealed and fixed to a special metal insert 211 on the outer wall of the nozzle 21 by high-temperature resistant epoxy resin to ensure its pressure resistance and sealing performance. When the ambient temperature reaches the melting point of the alloy, the strength of the film is instantly lost. Under the pressure of the pre-charge pressure inside the pipe 2 or the pressure impact after the drive device 3 is started, it is quickly torn, curled or melted and perforated to form an open channel.

[0025] The driving device 3 is connected to one end of the pipe 2. The driving device 3 is an independent module connected to the end of the pipe 2. Both ends of the pipe 2 are connected to U-shaped bends 23. Both ends of the pipe 2 are connected to the driving device 3 through the U-shaped bends 23. The driving device 3 includes a thermal expansion chamber 31 and a piston 32 disposed therein. The thermal expansion chamber 31 is configured to generate high-pressure gas when heated, driving the piston 32 to move and expel the dry powder in the pipe 2 from the nozzle 21. The front end of the thermal expansion chamber 31 is connected to a U-shaped bend 23, and an inner ring 311 is provided on the inner wall of the thermal expansion chamber 31. One end of the piston 32 is attached to one end of the inner ring 311. The other end of the thermal expansion chamber 31 at the inner ring 311 is sealed with a phase change working fluid. The boiling point of the phase change working fluid is slightly lower than the operating temperature of the thermistor 22, it has a large latent heat of vaporization, can generate a large amount of steam, and has stable chemical properties. The working fluid is non-toxic and harmless, and can be fluorinated hydrocarbons such as pentafluoropropane and tetrafluoropropylene, or a mixture of deionized water and ethylene glycol. The filling amount of the working fluid is precisely calculated to ensure that sufficient pressure can be generated at the target temperature to drive the piston 32 to complete the entire stroke. The piston 32 is made of engineering plastic or surface-treated metal and is equipped with double sealing rings to ensure dynamic sealing when sliding in the thermal expansion chamber 31 and to prevent leakage of working fluid vapor. The stroke of the piston 32 is designed to ensure that most of the effective dry powder in the pipeline network 2 is pushed out. In the non-working state, the piston 32 is in the initial position.

[0026] When the battery module is working normally, the temperature is below 80℃, the working fluid in the drive device 3 is liquid, the pressure is saturated vapor pressure, the pipe 2 is filled with dry powder, the nozzle 21 is tightly sealed by the heat-sensitive film 22, and the entire system is in standby mode.

[0027] When an internal short circuit occurs in a battery cell, the temperature rises sharply. The heat acts on the thermistor film 22 through thermal conduction and possible flame radiation. When the local temperature reaches the melting point of 100°C, the film loses its strength.

[0028] The thermal expansion chamber 31 of the drive unit 3 quickly transfers heat to the internal working fluid.

[0029] The working fluid absorbs heat, vaporizes rapidly, and expands in volume hundreds of times, generating high pressure in the sealed thermal expansion chamber 31. The pressure acts on the end face of the piston 32.

[0030] High pressure drives piston 32 to move at high speed, compressing the air at the front of pipe 2 like a syringe and directly pushing dry powder. Under the action of high pressure airflow, the dry powder rushes towards all nozzles 21. At this time, because the heat-sensitive film 22 has been ruptured by heat in the first step or its strength has decreased sharply, the high pressure dry powder airflow easily breaks through the weakened film, forming one or more high-speed, concentrated powder airflows, which are accurately shot towards the initially heated battery cell and its surrounding area.

[0031] The dry powder is applied to the surface of the high-temperature battery cell and any potential flame. Its function is to decompose and absorb heat, reduce the surface temperature of the combustible material, isolate oxygen from the inactive substances produced by decomposition, and interrupt the combustion chain reaction. At the same time, the high-speed powder airflow also has a certain effect of extinguishing the flame and diluting the oxygen.

[0032] This device utilizes the energy of the disaster itself as a trigger and power source, without relying on external power or signals, resulting in extremely high reliability. Both the thermistor 22 and the thermal expansion cavity 31 are based on the principle of physical phase change, with a response speed in the millisecond range. They can intervene before a large-scale open flame forms, nipping thermal runaway in the bud. The three functions of heat insulation, buffering, and fire extinguishing are seamlessly integrated into a thin-layer component without occupying valuable space in the battery pack. This meets the development requirements of lightweight and high-energy-density electric vehicles. The system has no complex electronic components, few moving parts, and all materials are resistant to high temperatures and aging, with the same lifespan as the battery pack, requiring virtually no maintenance.

[0033] Pipe 2 has two ends, a and b, respectively. Each end of a single pipe 2 is connected to a drive device 3, and two drive devices 3 are arranged side by side on both sides of pipe 2. The thermal expansion end of the upper drive device 3 is aligned with the b end of pipe 2, and the other end of the upper drive device 3 is connected to the a end of pipe 2 through a U-shaped bend 23. The thermal expansion end of the lower drive device 3 is aligned with the a end of pipe 2, and the other end of the lower drive device 3 is connected to the b end of pipe 2 through a U-shaped bend 23. Multiple pipes 2 and drive devices 3 are provided, all arranged side by side in the base pad 1.

[0034] If the temperature at end a rises first, causing the heat-sensitive membrane 22 at that location to fail first, the heat is quickly conducted to the thermal expansion end of the lower drive device 3, which is aligned vertically with end a. The lower drive device 3 is thus rapidly activated, and its piston motion, through the U-shaped bend 23, directly applies its power to end b of pipe 2. This action is equivalent to applying pressure from end b of pipe 2, forcefully pushing most of the dry powder within pipe 2 towards end a, where the fire is most severe and the extinguishing agent fails first. Before reaching point A, the dry powder will not be lost in large quantities from nozzles 21 at other locations, thus achieving the accumulation and enhanced spraying of dry powder in the area at point A where the ignition point is located. The system can automatically identify the initial explosion point of the fire and prioritize and concentrate the delivery of fire extinguishing resources to the most dangerous and needed locations. At the most critical moment in the early stage of the fire, it forms an extremely high concentration of dry powder coverage at the local fire point, instantly suppressing the flames and greatly improving the success rate of extinguishing early fires. It avoids the waste of fire extinguishing agents in non-disaster areas. The entire process does not require electronic sensors or complex control logic. It achieves physical intelligence entirely through ingenious fluid loop design and thermodynamic response, resulting in extremely high reliability.

[0035] When a fire occurs in the middle of pipe 2 or both drive devices 3 are triggered simultaneously, the system exhibits a second operating mode. Both drive devices 3 are triggered simultaneously; the upper drive device 3 injects high-pressure gas from end a, and the lower drive device 3 injects high-pressure gas from end b. The dry powder in pipe 2 is simultaneously subjected to opposing impact forces from both ends a and b, meeting in the middle region of pipe 2, generating intense turbulence and vortices. This strong turbulence exerts multi-directional shear force on the dry powder, effectively crushing agglomerates between dry powder particles and completely lifting and raising the stationary dry powder layer tightly adhering to the pipe wall. This ensures that dry powder at any location within pipe 2 is fully mobilized, greatly improving the utilization rate of the extinguishing agent and eliminating the risk of extinguishing failure due to dry powder deposition. Simultaneous injection of high-pressure gas from both ends of pipe 2 is equivalent to establishing high-pressure sources at both ends of pipe 2, which will form a high-pressure vortex within pipe 2. This creates a more evenly distributed flow field. All nozzles 21 arranged along pipe 2, regardless of whether they are closer to end a or end b, operate under similar back pressure, thus achieving nearly equal outlet flow rate and spray velocity, achieving uniform coverage. This makes the spray coverage of the fire extinguishing dry powder more uniform and predictable, and can accurately cover the pre-designed fire extinguishing area. Two drive devices 3 are connected to a single pipe 2. Even if one drive device 3 fails, the other drive device 3 can still work independently to drive the dry powder in the entire pipe 2, providing valuable fault tolerance. Through the cross-connected U-shaped loop, the system not only has a powerful driving force, but also has the physical intelligence to autonomously determine the initial location of the fire and implement targeted enhanced fire extinguishing, constructing a comprehensive and precise active safety protection system to cope with battery thermal runaway.

[0036] Several nozzles 21 are provided, symmetrically arranged on both sides of the pipe 2.

[0037] A metal insert 211 is provided on the nozzle 21. The heat-sensitive membrane 22 is sealed and fixed on the metal insert 211 around the nozzle 21 by high-temperature resistant epoxy resin to ensure its pressure resistance and sealing performance.

[0038] The outer wall of the thermal expansion cavity 31 is provided with several heat-conducting fins 312 arranged in a ring. The thermal expansion cavity 31 is a closed cavity made of a high thermal conductivity metal. Its outer wall is a cylinder with fins to increase the heating area and facilitate the vaporization of the internal phase change working fluid.

[0039] Example 2: Refer to Figure 7 - Figure 10This is the second embodiment of the present invention. This embodiment is different from the first embodiment. The first embodiment mainly deals with local fire points and realizes local fire suppression. In this process, the drive devices 3 on the pipes 2 in the heat insulation pads between multiple sets of battery cells are not all activated. The initial position of the fire is random, which may cause some drive devices 3 to be unable to be triggered because they are located far from the fire source, resulting in a waste of power resources and failure of the isolation function.

[0040] To address the aforementioned issues, this embodiment includes a heat insulation cavity 14 separated from the battery cell within the battery casing 13. One end of the heat insulation cavity 14 is fitted with an inner plate 15 for heat insulation and flame retardancy. One end of the drive device 3 penetrates the inner plate 15 and is positioned within the heat insulation cavity 14. The heat insulation cavity 14 is filled with an igniter, and guide plates 141 are provided at both ends of the heat insulation cavity 14. One end of the guide plate 141 is attached to the heat insulation pad, and the other end of the guide plate 141 contacts the igniter. Two sealing plates 151 are provided on one side of the inner plate 15 to seal... A shape memory metal is provided between the baffle plates 151. When spontaneous combustion occurs inside the battery cell, the ignition material is ignited by the guide plate 141, which can heat all the drive devices 3 in the heat insulation cavity 14 and enable them to start. The temperature of the ignition material can be transferred to the shape memory metal. Then, the shape memory metal deforms and causes the baffle plates 151 to move away from each other, pressing the guide plate 141 against the inner wall of the heat insulation cavity 14, blocking its ignition performance, ensuring that the heat insulation cavity 14 is in a completely sealed state, and preventing the fire from spreading to the inside of the battery cell.

[0041] Through the guide plates 141 distributed on the heat insulation pad, regardless of where the fire originates in the module, as long as it reaches a temperature sufficient to ignite the guide plates 141, it can serve as a trigger signal. The guide plates 141 rapidly transmit the flame or high temperature to the igniter in the heat insulation cavity 14. The rapid combustion of the igniter instantly generates a uniform high-temperature environment in the sealed heat insulation cavity 14. This high-temperature environment simultaneously and uniformly and intensely heats the thermal expansion ends of all the drive devices 3 in the heat insulation cavity 14, forcibly and synchronously activating each drive device 3. This ensures that under any fire situation, all the dry powder in all pipes 2 can be fully driven, forming a powerful, total flooding fire extinguishing powder flow covering the entire battery module. When local fire suppression fails, a solid dry powder isolation zone is synchronously established between all cells, greatly improving the success rate of preventing heat spread. This fundamentally solves the problem of uneven response caused by the randomness of the fire source location, achieving a system-level protection without blind spots.

[0042] The high temperature generated by the igniter, while activating all the drive devices 3, is also transferred to the shape memory metal between the sealing plates 151 on one side of the inner plate 15. After reaching a specific transformation temperature, the shape memory metal deforms, driving the two sealing plates 151 to move away from each other. During this process, the sealing plates 151 forcefully press the guide plate 141 against the inner wall of the heat insulation cavity 14, directly flattening or shearing the guide plate 141 and completely destroying its physical structure. Even if the guide plate 141 is not completely crushed, the huge pressure is enough to form an extremely effective seal between it and the inner wall of the cavity, completely blocking the propagation path of gas and flame. After completing the core task of heat transfer, it can automatically and actively cut off the dangerous connection channel, completely sealing the hazards generated by the combustion of the igniter within the heat insulation cavity 14, effectively preventing the flame from spreading back to the cell area through the channel of the guide plate 141.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery module aerogel buffer insulation pad, comprising a base pad (1) and buffer pads (11) adhered to its two end faces, characterized in that, Also includes The pipe (2) is located inside the base pad (1), and the pipe (2) is filled with dry powder; The nozzle (21) is located on the pipe (2); A thermal membrane (22), which is sealed over the nozzle (21), is configured to rupture when a predetermined temperature is reached; The drive device (3) is connected to one end of the pipe (2); The drive device (3) includes a thermal expansion cavity (31) and a piston (32) disposed therein. The thermal expansion chamber (31) is configured to generate high-pressure gas when heated, driving the piston (32) to move so as to squeeze the dry powder in the pipe (2) out of the nozzle (21).

2. The aerogel buffer insulation pad for a battery module according to claim 1, characterized in that, Both ends of the pipe (2) are connected to U-shaped bends (23), and both ends of the pipe (2) are connected to the drive device (3) through the U-shaped bends (23).

3. The aerogel buffer insulation pad for a battery module according to claim 2, characterized in that, The front end of the thermal expansion cavity (31) is connected to the U-shaped bend (23), and the inner wall of the thermal expansion cavity (31) is provided with an inner ring (311), and one end of the piston (32) is attached to one end of the inner ring (311).

4. The aerogel buffer insulation pad for a battery module according to claim 3, characterized in that, The thermal expansion cavity (31) at the other end of the built-in ring (311) is sealed with a phase change working fluid.

5. The aerogel buffer insulation pad for a battery module according to claim 1, characterized in that, The two ends of the pipe (2) are end a and end b, respectively. Each end of a single pipe (2) is connected to a driving device (3), and the two driving devices (3) are arranged side by side on both sides of the pipe (2). The thermal expansion end of the upper driving device (3) is aligned with end b of the pipe (2), and the other end of the upper driving device (3) is connected to end a of the pipe (2) through a U-shaped bend (23). The thermal expansion end of the lower driving device (3) is aligned with end a of the pipe (2), and the other end of the lower driving device (3) is connected to end b of the pipe (2) through a U-shaped bend (23).

6. The aerogel buffer insulation pad for a battery module according to claim 1, characterized in that, Multiple pipes (2) and drive devices (3) are provided, all arranged side by side in the base pad (1).

7. The aerogel buffer insulation pad for a battery module according to claim 1, characterized in that, Several nozzles (21) are provided, symmetrically arranged on both sides of the pipe (2).

8. The aerogel buffer insulation pad for a battery module according to claim 7, characterized in that, A metal mount (211) is provided on the nozzle (21), and the heat-sensitive film (22) is sealed and fixed on the metal mount (211) around the nozzle (21) by high-temperature resistant epoxy resin.

9. The aerogel buffer insulation pad for a battery module according to claim 8, characterized in that, The outer wall of the thermal expansion cavity (31) is provided with a number of heat-conducting fins (312) arranged in a ring.

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