Battery flame-retardant, heat-insulating and shockproof functional film and production process thereof

Abstract

The application discloses a battery flame-retardant heat-insulating shockproof functional film and a production process thereof, and belongs to the technical field of new energy batteries. The battery flame-retardant heat-insulating shockproof functional film and the production process thereof comprise a composite diaphragm main body, wherein the composite diaphragm main body comprises a single gas condensation film sheet and a flame-retardant dustproof cloth. In order to solve the problem that the method of compounding fiber as a base material with inorganic aerogel has limited toughness improvement of the aerogel, and cannot prevent object puncture caused by impact under the sudden state of a vehicle and damage to the battery caused by high impact, the pressure of the hinge edge area is smaller than the atmospheric pressure, under the influence of the external pressure, the two are closely attached together, and the surface friction resistance of the cloth itself can effectively prevent the impact force generated during explosion from spreading outward in the first time.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, specifically to a battery flame-retardant, heat-insulating, and shock-resistant functional film and its manufacturing process. Background Technology

[0002] Currently, electric vehicles mainly use lithium-ion batteries as power batteries. However, under extreme conditions, battery thermal runaway is the primary safety issue for electric vehicles. A common and serious problem is that overcharging leads to excessively high temperatures, causing electric vehicles to catch fire or explode. For the problem of localized runaway of battery cells in new energy vehicles, aerogel insulation materials are an effective measure to solve the thermal runaway problem of power batteries and can improve the safety of new energy vehicles. The invention with application number 201610944304.2 discloses a heat insulation film for battery packaging, which uses tetrabutyl titanate as a precursor and adds fiber-modified aerogel, which can effectively improve the toughness of the finished product, improve the dispersibility of fillers in the resin, effectively reduce agglomeration, and improve the stability of the finished product. It also adds nano alumina, nano cerium dioxide, polyethylene terephthalate and other components to enhance the thermal insulation performance of the finished film.

[0003] The extremely high porosity of aerogels makes them highly brittle and fragile in terms of mechanical properties. This fragility is a key factor hindering the application of many inorganic aerogels. In the aforementioned patent, using fibers as a substrate to composite with inorganic aerogels can significantly improve the elastic properties of the composite aerogels. However, this method has limited effect on improving the toughness of the aerogels and cannot address the damage to batteries caused by sudden impacts from vehicles or high-impact collisions. Therefore, it does not meet current needs. To address this, a battery flame-retardant, heat-insulating, and shock-absorbing functional film and its manufacturing process are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a battery flame-retardant, heat-insulating, and shock-absorbing functional film and its manufacturing process. When the inner and outer hinge edges of adjacent single-cell aerosol membrane sheets overlap, the pressure in the hinge edge area will be lower than the external atmospheric pressure. Under the influence of the external pressure, the two will adhere tightly together in time. In addition, the surface friction resistance of the fabric itself, when the battery explodes or an object impacts from the outside, the single-cell aerosol membrane forms a composite separator that can play a good protective role. It can effectively block the impact force generated during the explosion and prevent it from spreading outwards immediately, thus solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a battery flame-retardant, heat-insulating, and shock-absorbing functional membrane, comprising a composite membrane body, wherein the composite membrane body comprises a single aerogel membrane sheet and a flame-retardant and dust-proof woven fabric, the single aerogel membrane sheets are arranged in a matrix distribution, and a rubber plate gap is provided between the single aerogel membrane sheets, wherein the positioning plug inside the rubber plate gap and the flame-retardant and dust-proof woven fabric are integrated into a single structure, the single aerogel membrane sheet comprises a woven film bag and an aerogel inner core, the woven film bag comprising a flame-retardant elastic rope and a metal ring buckle.

[0006] Preferably, the flame-retardant elastic cords are connected by a metal ring buckle, wherein the diameter of the flame-retardant elastic cord is 0.75 mm and the diameter of the metal ring buckle is 0.5 mm.

[0007] Preferably, an inner hinge edge is provided on one side adjacent to the monomer aerocondensing membrane, the inner hinge edge including an inner long hinge edge and an inner short hinge edge, and an outer hinge edge is provided on the other side adjacent to the monomer aerocondensing membrane, the outer hinge edge including an outer long hinge edge and an outer short hinge edge.

[0008] Preferably, both ends of the inner hinge edge are provided with double-headed magnetic pole cards, and the double-headed magnetic pole cards are connected to the inner hinge edge through card slots.

[0009] Preferably, one side of the dual-headed magnetic pole card is configured with a magnetic structure, and the other side of the dual-headed magnetic pole card is configured with an iron structure.

[0010] Preferably, the thickness of the inner hinge edge and the outer hinge edge is 0.25mm, and a clamping groove is provided between the inner hinge edges and between the outer hinge edges.

[0011] Preferably, a rigid gel skeleton is provided around the gel core.

[0012] Another technical solution provided by the present invention: a manufacturing process for a battery flame-retardant, heat-insulating, and shock-absorbing functional film, comprising the following steps:

[0013] S1: Pour epoxy resin into a mold to make a framework structure for inorganic aerogel. After the framework is made, take out the rigid colloidal framework and put it into the aerogel molding mold.

[0014] S2: Place the alcohol gel in a supercritical fluid drying dry pressure container, lower its temperature using a temperature controller, open the pressure reducing valve of the CO2 cylinder, and introduce CO2 from the top of the high-pressure container. As CO2 gas is continuously introduced, a liquid-gas two-phase equilibrium is reached, with the lower layer being liquid CO2. At this point, the ethanol solvent in the gel can be gradually and completely replaced by liquid CO2.

[0015] S3: The temperature is increased at a certain rate, and the liquid CO2 begins to expand gradually. The pressure first reaches the critical pressure. The temperature continues to rise. By releasing a small amount of CO2, the pressure remains constant and eventually reaches the pre-selected critical temperature.

[0016] S4: Maintain the critical state for a certain period of time to allow the liquid in the gel pores to be completely converted into the critical liquid. Pour the liquid aerogel into a mold containing a rigid colloidal skeleton. Then, while keeping the critical temperature constant, slowly release the CO2 fluid of the drying medium through the exhaust valve. When the temperature drops to room temperature, the aerogel is obtained.

[0017] S5: High-density polyethylene chopped strands and aramid chopped strands are blended and woven into individual elastic ropes. Two individual elastic ropes are then cross-woven into flame-retardant elastic ropes. The woven flame-retardant elastic ropes are connected by metal ring buckles to make a mixed woven film bag.

[0018] S6: During the weaving process of the hybrid woven film bag, hinge edges are processed on both sides of each film bag. Finally, the aerogel core is wrapped inside the hybrid woven film bag, and the edges of the hybrid woven film bag are sewn together to obtain a single aerogel membrane sheet. The single aerogel membrane sheets can be combined to form a composite membrane.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention relates to a woven film bag composed of flame-retardant elastic cord and metal ring buckle. The flame-retardant elastic cord is made by weaving individual elastic cords from a blend of high-density polyethylene chopped strands and aramid chopped strands. Two individual elastic cords are then cross-woven to form a flame-retardant elastic cord. The woven flame-retardant elastic cords are connected by metal ring buckles to form the woven film bag. The flame-retardant elastic cord has flame-retardant properties as well as good toughness and elasticity. When subjected to external impact, the flame-retardant elastic cord can absorb excess impact force through deformation and stretching, preventing excessive impact force from damaging the battery. The metal ring buckle bridging the flame-retardant elastic cord is thicker than the flame-retardant elastic cord itself. Therefore, when it comes into contact with the impact of some sharp objects, the metal ring buckle can block the objects and prevent them from puncturing the woven film bag.

[0021] 2. In this invention, the single aerogel membrane is composed of two layers of woven film bags and an aerogel core. The aerogel core is wrapped inside the woven film bag, and then the edges of the woven film bag are sewn together to obtain the single aerogel membrane. The two woven film bags used for assembly are designed with inner and outer hinge edges on adjacent sides. When the single aerogel membrane is assembled into a composite separator, the adjacent outer long hinge edges and inner long hinge edges, as well as the outer short hinge edges and inner short hinge edges are stacked layer by layer. When the inner and outer hinge edges around the adjacent single aerogel membrane are stacked, the pressure in the hinge edge area will be less than the external atmospheric pressure. Under the influence of the external pressure, the two will be tightly bonded together. In addition, the surface friction resistance of the fabric itself, when the battery explodes or an object impacts from the outside, the single aerogel membrane forming a composite separator can play a good protective role, effectively blocking the impact force generated during the explosion and preventing it from spreading outwards immediately.

[0022] 3. In this invention, the rigid gel skeleton is manufactured using epoxy resin molding. Its overall hardness is higher than that of the aerogel core. Therefore, in the production process, the manufactured rigid gel skeleton is first placed into the aerogel mold, and then liquid aerogel is poured into the mold containing the rigid gel skeleton. When the temperature drops to room temperature, the aerogel is obtained. The formed aerogel and the rigid gel skeleton form an integrated structural design. The rigid gel skeleton surrounds the aerogel, so that when subjected to impact and bending, the rigid gel skeleton can play a supporting role and prevent the aerogel from undergoing severe deformation. Attached Figure Description

[0023] Figure 1 This is the overall front view of the present invention;

[0024] Figure 2 This is a schematic diagram of the main structure of the composite diaphragm of the present invention;

[0025] Figure 3 This is a schematic diagram of the monomer aerocondensation membrane structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the hybrid woven film bag structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the flame-retardant elastic rope structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the monomer aerocondensate membrane of the present invention;

[0029] Figure 7 This is a schematic diagram of the aerogel core structure of the present invention.

[0030] In the diagram: 1. Composite diaphragm body; 2. Monomer aerogel membrane sheet; 3. Flame-retardant and dust-proof fabric; 4. Aerogel core; 101. Gap between adhesive sheets; 201. Woven film bag; 2011. Inner hinge edge; 2012. Outer hinge edge; 2013. Double-headed magnetic pole card; 211. Flame-retardant elastic rope; 212. Metal ring buckle; 301. Positioning plug; 401. Rigid gel skeleton. Detailed Implementation

[0031] 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.

[0032] Please see Figure 1-7 An embodiment of the present invention provides a battery flame-retardant, heat-insulating, and shock-absorbing functional membrane, comprising a composite separator body 1, the composite separator body 1 comprising a single aerogel membrane sheet 2 and a flame-retardant and dust-proof fabric 3, the single aerogel membrane sheets 2 being arranged in a matrix distribution, and a glue plate gap 101 being provided between the single aerogel membrane sheets 2, the positioning plug 301 inside the glue plate gap 101 being integrated with the flame-retardant and dust-proof fabric 3, the single aerogel membrane sheet 2 comprising a mixed-woven film bag 201 and an aerogel inner core 4, the mixed-woven film bag 201 comprising a flame-retardant elastic rope 211 and a metal ring buckle 212, the flame-retardant elastic ropes 211 being connected by the metal ring buckle 212, the diameter of the flame-retardant elastic rope 211 being 0.75mm, and the diameter of the metal ring buckle 212 being 0.5mm;

[0033] The composite separator body 1 is composed of multiple individual aerosol membrane sheets 2 spliced ​​together. This spliced ​​structure design can be used with battery modules of different sizes. It eliminates the time spent on cutting during use and also avoids changes in the internal structure of the separator caused by cutting, which would affect the overall quality of the separator.

[0034] The woven film bag 201 is composed of flame-retardant elastic cord 211 and metal ring buckle 212. The flame-retardant elastic cord 211 is made by weaving individual elastic cords from a blend of high-density polyethylene chopped strands and aramid chopped strands. Two individual elastic cords are then cross-woven to form the flame-retardant elastic cord 211. The woven flame-retardant elastic cords 211 are connected by the metal ring buckle 212 to form the woven film bag 201. The flame-retardant elastic cord 211 has flame-retardant properties as well as good toughness and elasticity. When subjected to external impact, the flame-retardant elastic cord 211 can absorb excess impact force through deformation and stretching, preventing excessive impact force from damaging the battery. The metal ring buckle 212 bridging the flame-retardant elastic cord 211 is thicker than the flame-retardant elastic cord 211. Therefore, when it comes into contact with the impact of some sharp objects, the metal ring buckle 212 can block the objects and prevent them from puncturing the woven film bag 201.

[0035] An inner hinge edge 2011 is provided on one side adjacent to the single aerocondensing membrane 2. The inner hinge edge 2011 includes an inner long hinge edge and an inner short hinge edge. An outer hinge edge 2012 is provided on the other side adjacent to the single aerocondensing membrane 2. The outer hinge edge 2012 includes an outer long hinge edge and an outer short hinge edge. Both ends of the inner hinge edge 2011 are provided with double-headed magnetic pole cards 2013. The double-headed magnetic pole cards 2013 are connected to the inner hinge edge 2011 through card slots. One side of the double-headed magnetic pole cards 2013 is set with a magnetic structure, and the other side of the double-headed magnetic pole cards 2013 is set with an iron structure. The thickness of the inner hinge edge 2011 and the outer hinge edge 2012 is 0.25mm. A clamping groove is provided between the inner hinge edges 2011 and between the outer hinge edges 2012.

[0036] The single-layer aerogel membrane 2 is composed of two layers of woven film bags 201 and an aerogel core 4. The aerogel core 4 is wrapped inside the woven film bag 201, and then the edges of the woven film bag 201 are sewn together to obtain the single-layer aerogel membrane 2. The two woven film bags 201 used for assembly are designed with inner hinge edges 2011 and outer hinge edges 2012 on adjacent sides. When the single-layer aerogel membrane 2 is assembled into a composite diaphragm, the adjacent outer long hinge edges are connected to the inner long hinge edges, and the outer short hinge edges are connected to the inner short hinge edges. When the inner hinge edges 2011 and outer hinge edges 2012 of adjacent aerosol membrane sheets 2 are stacked together, the pressure in the hinge edge area will be less than the external atmospheric pressure. Under the influence of the external pressure, the two will be tightly bonded together. In addition, the surface friction resistance of the fabric itself, when the battery explodes or an object impacts from the outside, the composite membrane formed by the aerosol membrane sheets 2 can play a good protective role, effectively blocking the impact force generated during the explosion and preventing it from spreading outwards immediately.

[0037] The interior of the single aerogel membrane 2 is provided with an aerogel core 4, and the aerogel core 4 is surrounded by a rigid colloidal skeleton 401.

[0038] The rigid gel skeleton 401 is manufactured using epoxy resin molding. Its overall hardness is higher than that of the aerogel core 4. Therefore, in the production process, the processed rigid gel skeleton 401 is first placed into the aerogel mold, and then liquid aerogel is poured into the mold containing the rigid gel skeleton 401. When the temperature drops to room temperature, the aerogel is obtained. The formed aerogel and the rigid gel skeleton 401 form an integrated structural design. The rigid gel skeleton 401 surrounds the aerogel, so that when subjected to impact and bending, the rigid gel skeleton 401 can play a supporting role and prevent the aerogel from being severely deformed.

[0039] To better illustrate the production process of a battery flame-retardant, heat-insulating, and shock-absorbing functional film, this embodiment proposes a production process for such a film, including the following steps:

[0040] S1: Pour epoxy resin into a mold to make a skeleton structure for inorganic aerogel. After the skeleton is made, take out the rigid colloidal skeleton 401 and put it into the aerogel molding mold.

[0041] S2: Place the alcohol gel in a supercritical fluid drying dry pressure container, lower its temperature using a temperature controller, open the pressure reducing valve of the CO2 cylinder, and introduce CO2 from the top of the high-pressure container. As CO2 gas is continuously introduced, a liquid-gas two-phase equilibrium is reached, with the lower layer being liquid CO2. At this point, the ethanol solvent in the gel can be gradually and completely replaced by liquid CO2.

[0042] S3: The temperature is increased at a certain rate, and the liquid CO2 begins to expand gradually. The pressure first reaches the critical pressure. The temperature continues to rise. By releasing a small amount of CO2, the pressure remains constant and eventually reaches the pre-selected critical temperature.

[0043] S4: Maintain the critical state for a certain period of time to allow the liquid in the gel pores to be completely converted into the critical liquid. Pour the liquid aerogel into a mold containing a rigid colloidal skeleton 401. Then, while keeping the critical temperature constant, slowly release the CO2 fluid of the drying medium through the exhaust valve. When the temperature drops to room temperature, the aerogel is obtained.

[0044] S5: High-density polyethylene chopped strands and aramid chopped strands are blended and woven into individual elastic ropes. Two individual elastic ropes are then cross-woven into flame-retardant elastic ropes 211. The woven flame-retardant elastic ropes 211 are connected by metal ring buckles 212 to make a mixed woven film bag 201.

[0045] S6: During the weaving process of the mixed-woven film bag 201, hinge edges are processed on both sides of each film bag. Finally, the aerogel core 4 is wrapped inside the mixed-woven film bag 201, and the edges of the mixed-woven film bag 201 are sewn together to obtain the single aerogel membrane 2. The single aerogel membrane 2 can be combined to form a composite diaphragm.

[0046] Working principle: The composite separator body 1 is composed of multiple individual aerogel membrane sheets 2 spliced ​​together. This spliced ​​structure design can be used with battery modules of different sizes, eliminating the time spent on cutting during use and avoiding changes in the internal structure of the separator caused by cutting, thus affecting the overall quality of the separator. The individual aerogel membrane sheet 2 is composed of two layers of woven membrane bags 201 and an aerogel inner core 4. The aerogel inner core 4 is wrapped inside the woven membrane bag 201, and then the seams of the woven membrane bag 201 are sewn together to obtain the final product. The single-unit aerocondensing membrane 2, wherein the two woven film bags 201 used for assembly are each designed with inner hinge edges 2011 and outer hinge edges 2012 on adjacent sides. When the single-unit aerocondensing membrane 2 is assembled into a composite diaphragm, the adjacent outer long hinge edges and inner long hinge edges, as well as the outer short hinge edges and inner short hinge edges, are stacked layer by layer. When the inner hinge edges 2011 and outer hinge edges 2012 around the adjacent single-unit aerocondensing membrane 2 are stacked, the pressure in the hinge edge area will be less than the external atmospheric pressure. Under the influence of the external pressure, the two will be tightly bonded together in time. In addition, the surface friction of the fabric itself will also contribute to this. Friction resistance; in the event of a battery explosion or impact from the outside, the individual aerosol membrane 2 forms a composite diaphragm that provides excellent protection, effectively blocking the impact force generated during the explosion and preventing it from spreading outwards immediately. The woven film bag 201 is composed of flame-retardant elastic cord 211 and metal ring buckle 212. The flame-retardant elastic cord 211 is made by weaving individual elastic cords from a blend of high-density polyethylene chopped strands and aramid chopped strands, and then crossing two individual elastic cords to form the flame-retardant elastic cord 211. The woven flame-retardant elastic cords 211 are connected by... Metal ring buckles 212 are used to connect the components, thus forming a mixed-woven film bag 201. The flame-retardant elastic cord 211 has flame-retardant properties as well as good toughness and elasticity. When subjected to external impact, the flame-retardant elastic cord 211 can absorb excess impact force through deformation and stretching, avoiding damage to the battery due to excessive impact force. The metal ring buckles 212 bridging the flame-retardant elastic cord 211 are thicker than the flame-retardant elastic cord 211. Therefore, when it comes into contact with the impact of some sharp objects, the metal ring buckles 212 can block the objects and prevent them from puncturing the mixed-woven film bag 201.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery flame-retardant, heat-insulating, and shock-absorbing functional membrane, comprising a composite separator body (1), characterized in that: The composite diaphragm body (1) includes a single aerogel membrane sheet (2) and a flame-retardant dustproof fabric (3). The single aerogel membrane sheets (2) are arranged in a matrix. There is a glue plate gap (101) between the single aerogel membrane sheets (2). The positioning plug (301) inside the glue plate gap (101) and the flame-retardant dustproof fabric (3) are integrated into one structure. The single aerogel membrane sheet (2) includes a mixed-woven film bag (201) and an aerogel inner core (4). The mixed-woven film bag (201) includes a flame-retardant elastic rope (211) and a metal ring buckle (212).

2. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 1, characterized in that: The flame-retardant elastic cords (211) are connected by metal ring buckles (212). The flame-retardant elastic cords (211) have a diameter of 0.75 mm, and the metal ring buckles (212) have a diameter of 0.5 mm.

3. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 2, characterized in that: The single aerosol membrane (2) has an inner hinge edge (2011) on one side adjacent to it. The inner hinge edge (2011) includes an inner long hinge edge and an inner short hinge edge. The single aerosol membrane (2) has an outer hinge edge (2012) on the other side adjacent to it. The outer hinge edge (2012) includes an outer long hinge edge and an outer short hinge edge.

4. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 3, characterized in that: Both ends of the inner hinge edge (2011) are provided with double-headed magnetic pole cards (2013), and the double-headed magnetic pole cards (2013) are connected to the inner hinge edge (2011) through card slots.

5. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 4, characterized in that: One side of the dual-headed magnetic pole card (2013) is configured with a magnetic structure, and the other side of the dual-headed magnetic pole card (2013) is configured with an iron structure.

6. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 5, characterized in that: The thickness of the inner hinge edge (2011) and the outer hinge edge (2012) is 0.25mm. A clamping groove is provided between the inner hinge edge (2011) and between the outer hinge edges (2012).

7. The battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 6, characterized in that: The aerogel core (4) is surrounded by a rigid colloidal skeleton (401).

8. A manufacturing process for a battery flame-retardant, heat-insulating, and shock-absorbing functional film, implemented based on the battery flame-retardant, heat-insulating, and shock-absorbing functional film according to claim 7, wherein, Includes the following steps: S1: Pour epoxy resin into a mold to make a skeleton structure for inorganic aerogel. After the skeleton is made, take out the rigid colloidal skeleton (401) and put it into the aerogel molding mold. S2: Place the alcohol gel in a supercritical fluid drying dry pressure container, lower its temperature using a temperature controller, open the pressure reducing valve of the CO2 cylinder, and introduce CO2 from the top of the high-pressure container. As CO2 gas is continuously introduced, a liquid-gas two-phase equilibrium is reached, with the lower layer being liquid CO2. At this point, the ethanol solvent in the gel can be gradually and completely replaced by liquid CO2. S3: The temperature is increased at a certain rate, and the liquid CO2 begins to expand gradually. The pressure first reaches the critical pressure. The temperature continues to rise. By releasing a small amount of CO2, the pressure remains constant and eventually reaches the pre-selected critical temperature. S4: Hold the critical state for a certain time to allow the liquid in the gel pores to be completely converted into the critical liquid. Pour the liquid aerogel into a mold containing a rigid colloidal skeleton (401). Then, while keeping the critical temperature constant, slowly release the CO2 fluid of the drying medium through the exhaust valve. When the temperature drops to room temperature, the aerogel is obtained. S5: High-density polyethylene chopped strands and aramid chopped strands are blended and woven into individual elastic ropes. The two individual elastic ropes are then cross-woven into flame-retardant elastic ropes (211). The woven flame-retardant elastic ropes (211) are connected by metal ring buckles (212) to make a mixed-woven film bag (201). S6: During the weaving process of the mixed-weave film bag (201), hinge edges are processed on both sides of each film bag. Finally, the aerogel core (4) is wrapped inside the mixed-weave film bag (201), and the edges of the mixed-weave film bag (201) are sewn together to obtain a single aerogel membrane (2). The single aerogel membranes (2) are combined to form a composite membrane.

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