Built-in aerogel composite interlayer structure of battery module

Abstract

The invention discloses a battery module built-in aerogel composite interlayer structure, and belongs to the technical field of battery interlayers, the battery module built-in aerogel composite interlayer structure comprises an interlayer partition plate body, the interlayer partition plate body is composed of an external interlayer frame and internal densely distributed composite gel, and the composite gel is composed of an isolation skeleton, a transfer bearing air bag and a flexible aerogel filling body. The interlayer frame comprises a peripheral composite frame body and polyester fiber protection layers arranged on the two sides of the composite frame body and used for wrapping the composite gel, and a pressure buffering piece for elastically limiting the periphery of the composite gel is arranged in the composite frame body. According to the invention, the aerogel composite interlayer is designed, when the battery module extrudes the interlayer, the internal transfer bearing airbag exhausts gas to the inner buffer strip on the outermost side through a tiny pipeline, so that the inner buffer strip expands outwards, and the process converts the pressure directly acting on aerogel into controllable displacement, thereby creating a precious deformation space for the aerogel in the battery module; direct crushing is avoided, and dynamic pressure redistribution is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery separator, in particular to a kind of battery module built-in aerogel composite separator structure. BACKGROUND

[0002] With the continuous development of technology, there are more and more materials for the separator between the internal batteries of the battery module, among which the aerogel is used as the preferred material because it is much lighter than the transmission heat insulation material and can effectively block the heat transfer to the adjacent battery module, thus gaining valuable "escape time" for the entire battery system and preventing the chain reaction of thermal runaway. Currently, the aerogel used between the battery modules is mainly flexible aerogel and its composite material. The unique nano-porous network structure of the aerogel makes it extremely brittle and easily damaged when squeezed, which causes it to be unable to recover and the heat insulation performance to decrease. Although the existing composite material can provide part of the compression resistance by using fibers, the compression resistance provided by the composite material alone is often insufficient because the squeezed state between the batteries exists at all times during the daily operation of the vehicle-mounted battery. Moreover, when the battery burns and explodes, the current aerogel composite material is difficult to buffer the impact, causing the aerogel material to be damaged and exposed, which affects the heat insulation effect between the batteries. Therefore, the present application proposes a kind of battery module built-in aerogel composite separator structure. SUMMARY

[0003] The purpose of the present application is to solve the problems of the existing aerogel and propose a kind of battery module built-in aerogel composite separator structure.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A kind of battery module built-in aerogel composite separator structure, comprising a separator separator body, the separator separator body is composed of an external separator frame and an internal dense distribution of composite gel body, the composite gel body is composed of an isolation skeleton, a transfer bearing air bag and a flexible aerogel filling body; The separator frame includes a peripheral composite frame and a polyester fiber protective layer arranged on both sides of the composite frame for wrapping the composite gel body, and the composite frame is internally provided with a pressure buffer for elastically limiting the four sides of the composite gel body; The isolation skeleton is composed of a skeleton cylinder and an outwardly expanding cylinder arranged on both sides of the skeleton cylinder; The transfer bearing air bag is provided with a plurality of air bags, which are uniformly arranged between adjacent isolation skeletons for buffering the vibration impact between the battery modules; The flexible aerogel filling body is uniformly distributed around the isolation skeleton and the transfer bearing air bag.

[0005] As a preferred embodiment, the composite frame consists of a central internal rigid strip and an external flexible frame strip, the flexible frame strip deforming under pressure.

[0006] As a preferred embodiment, the pressure buffer includes an inner buffer strip disposed within the composite frame, wherein the inner side of the inner buffer strip has an adaptation groove adapted to the shape of the transfer bearing airbag.

[0007] As a preferred embodiment, the built-in rigid strip has two sliding openings, and a limiting connecting strip is slidably arranged in the sliding opening. Adjacent limiting connecting strips are connected to each other by an elastic pull rope. The limiting connecting strip is connected to a buffer inclined surface, and a buffer groove adapted to the buffer inclined surface is provided on the back of the inner buffer strip.

[0008] As a preferred embodiment, the polyester fiber protective layers located on both sides are interconnected by multiple traction fibers that penetrate the isolation frame, and the traction fibers are connected to the outer expansion cylinder through branch fibers.

[0009] As a preferred embodiment, the transfer bearing airbags are interconnected through micro-channels distributed between the flexible aerogel fillers to achieve the delivery of gas inside the transfer bearing airbags.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention designs an aerogel composite separator. When the battery module squeezes the separator, the internal transfer bearing airbag will discharge the gas through the micro-channel to the outermost inner buffer strip, causing it to expand outward. This process will directly act on the pressure of the aerogel and convert it into a controllable displacement, creating valuable deformation space for the internal aerogel, avoiding it from being directly crushed, and realizing dynamic pressure redistribution.

[0011] 2. This invention uses flexible frame strips as the first layer of buffer to share the initial pressure and achieve outer layer buffering; The internal pressure is converted into smooth outward and lateral displacement through the inner buffer strips, buffer ramps, and buffer troughs, further absorbing energy and achieving middle-layer buffering. The isolation framework provides stable support and elastic recovery, preventing excessive deformation of the aerogel and achieving internal support, which significantly compensates for the insufficient compressive strength of the aerogel. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structural assembly of a battery module with built-in aerogel composite separator proposed in this invention. Figure 2 This is a schematic diagram of the main structure of a battery module with built-in aerogel composite separator proposed in this invention; Figure 3This is a schematic diagram of the separator frame in a battery module built-in aerogel composite separator structure proposed in this invention; Figure 4 This is a schematic diagram of the composite gel body in the built-in aerogel composite separator structure of a battery module proposed in this invention; Figure 5 This is a schematic diagram showing the positional relationship between the isolation frame and the transfer bearing airbag in a battery module built-in aerogel composite separator structure proposed in this invention. Figure 6 This is a schematic diagram of the installation position of the buffer inclined surface in the built-in aerogel composite separator structure of a battery module proposed in this invention. Figure 7 This is a schematic diagram of the pressure buffer component in a battery module built-in aerogel composite separator structure proposed in this invention.

[0013] In the diagram: 1. Isolation frame; 101. Frame cylinder; 102. Outer expansion cylinder; 2. Transfer bearing airbag; 3. Flexible aerogel filler; 4. Composite frame; 401. Internal rigid strip; 402. Flexible frame strip; 5. Polyester fiber protective layer; 6. Inner buffer strip; 7. Limiting connection slide; 8. Elastic pull rope; 9. Buffer inclined surface; 10. Buffer inclined groove; 11. Traction fiber. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] Example, refer to Figures 1 to 7 A battery module with built-in aerogel composite separator structure includes a separator body, which is composed of an outer separator frame and an inner densely distributed composite gel body. The composite gel body is composed of an isolation skeleton 1, a transfer bearing airbag 2 and a flexible aerogel filler 3. The transfer bearing airbags 2 are interconnected through tiny tubes distributed between the flexible aerogel fillers 3. The interconnection can be achieved by connecting rows to rows to realize the delivery of gas inside the transfer bearing airbags 2. It should be noted that the transfer bearing airbag 2, located on the outermost side of the entire composite gel body, is wrapped by the matching groove opened in the inner buffer strip 6. When pressure is generated between adjacent battery modules, the internal transfer bearing airbag 2 will concentrate and transport the internal gas through micro-channels to the outermost transfer bearing airbag 2 under pressure. Through the outward expansion of the inner buffer strip 6, the pressure impact force is buffered and absorbed. Furthermore, the gas in the transfer bearing airbag 2 disappears, reducing its area. This allows the squeezed flexible aerogel filler 3 to have more deformation space, thereby avoiding the structural failure of the flexible aerogel filler 3 under strong pressure.

[0017] The partition frame includes an outer composite frame 4 and polyester fiber protective layers 5 disposed on both sides of the composite frame 4 for wrapping the composite gel. Further, the composite frame 4 is composed of an inner rigid strip 401 in the middle and an outer flexible frame strip 402. The flexible frame strip 402 will deform when compressed.

[0018] Among them, the flexible frame strip 402 is equivalent to a frame-shaped buffer rubber set between the battery modules. When compression occurs between the battery modules, it can share part of the pressure on the internal flexible aerogel filler 3 to avoid structural failure of the flexible aerogel filler 3.

[0019] The composite frame 4 is equipped with a pressure buffer that elastically limits the perimeter of the composite gel. The pressure buffer includes an inner buffer strip 6 inside the composite frame 4. The inner side of the inner buffer strip 6 has an adaptation groove that matches the shape of the transfer bearing airbag 2. When the composite gel is not under pressure, there is a space between the inner buffer strip 6 and the composite frame 4. The existence of this space allows the inner buffer strip 6 to expand outward under impact pressure.

[0020] Furthermore, two sliding openings are provided on the built-in rigid strip 401, and a limiting connecting strip 7 is slidably arranged in the sliding opening. Adjacent limiting connecting strips 7 are connected to each other by an elastic pull rope 8. The elastic pull rope 8 always exerts a pulling force on the buffer inclined surface 9 on both sides. The limiting connecting strip 7 is connected to the buffer inclined surface 9. A buffer inclined groove 10 adapted to the buffer inclined surface 9 is provided on the back of the inner buffer strip 6. The advantage of adopting the above structure is that when the composite gel is subjected to pressure, the inner buffer strip 6 will be squeezed outward. When squeezed, its buffer groove 10 will exert pressure on the buffer inclined surface 9 downward, causing the buffer inclined surface 9 to move to both sides, so that the inner buffer strip 6 can move outward, increasing the deformation space for the internal composite gel. This process will directly convert the pressure acting on the aerogel into a controllable displacement (this displacement space exists directly between the battery pack and the battery box).

[0021] The isolation frame 1 consists of a frame cylinder 101 and an outer expansion cylinder 102 disposed on both sides of the frame cylinder 101; multiple transfer bearing airbags 2 are disposed evenly between adjacent isolation frames 1 to buffer the vibration and impact between battery modules; and flexible aerogel fillers 3 are evenly distributed around the perimeter according to the shape of the isolation frame 1 and the transfer bearing airbags 2.

[0022] It should be noted that the flexible aerogel filler 3 is set inside and outside the isolation frame 1. The isolation frame 1 is made of flexible high-temperature resistant material. Its two sides do not occupy a large amount of surface space, so as to ensure that the flexible aerogel filler 3 can repeatedly contact the battery surface and achieve the maximum heat insulation effect. The existence of the isolation frame 1 also provides support and binding force for the flexible aerogel filler 3. Furthermore, the outwardly expanded cylinders 102 on both sides of the unique skeleton cylinder 101 of the isolation frame 1 can provide the maximum compressive bearing area and strong elastic recovery force.

[0023] Furthermore, the polyester fiber protective layers 5 located on both sides are interconnected by multiple traction fibers 11 that penetrate the isolation frame 1. The traction fibers 11 are connected to the outer expansion cylinder 102 through branch fibers. The arrangement of the traction fibers 11 can not only ensure the connection between two adjacent polyester fiber protective layers 5 and the composite gel, but also achieve the binding of the aerogel around the isolation frame 1. The traction fiber 11 runs through the entire structure, tightly connecting the polyester fiber protective layer 5 on both sides with the internal isolation skeleton 1 and flexible aerogel filler 3 to form a whole. This not only prevents the components from falling apart under vibration and impact, but also strengthens the binding of the aerogel, reducing its own wear and dust generation.

[0024] Through the above mechanism, whether it is the long-term slow expansion (static compression) of the battery during its life cycle or the instantaneous impact during thermal runaway and deflagration (dynamic impact), the destructive energy can be effectively absorbed and transferred; this ensures that the internal flexible aerogel filler 3 is always in a safe low-stress environment, its nanoporous structure is preserved, and thus its top-notch thermal insulation performance is maintained.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A battery module with an embedded aerogel composite separator structure, comprising a separator body, characterized in that, The partition plate body is composed of an outer partition frame and an inner densely distributed composite gel body. The composite gel body is composed of an isolation skeleton (1), a transfer bearing airbag (2), and a flexible aerogel filler (3). The partition frame includes an outer composite frame (4) and a polyester fiber protective layer (5) disposed on both sides of the composite frame (4) for wrapping the composite gel. The composite frame (4) is provided with a pressure buffer that elastically limits the periphery of the composite gel. The isolation frame (1) is composed of a frame cylinder (101) and an outer expansion cylinder (102) disposed on both sides of the frame cylinder (101); Multiple transfer bearing airbags (2) are provided and are evenly arranged between adjacent isolation frames (1) to buffer the vibration and impact between battery modules; The flexible aerogel filler (3) is evenly distributed around the perimeter according to the shape of the isolation skeleton (1) and the transfer bearing airbag (2).

2. The battery module built-in aerogel composite separator structure according to claim 1, characterized in that, The composite frame (4) consists of an inner rigid strip (401) in the middle and an outer flexible frame strip (402). The flexible frame strip (402) will deform when it is compressed.

3. The battery module built-in aerogel composite separator structure according to claim 2, characterized in that, The pressure buffer includes an inner buffer strip (6) disposed in the composite frame (4), and the inner side of the inner buffer strip (6) is provided with an adaptation groove that matches the shape of the transfer bearing airbag (2).

4. The battery module built-in aerogel composite separator structure according to claim 3, characterized in that, Two sliding openings are provided on the built-in rigid strip (401). A limiting connecting strip (7) is slidably provided in the sliding opening. Adjacent limiting connecting strips (7) are connected to each other by an elastic pull rope (8). A buffer inclined nipple (9) is connected to the limiting connecting strip (7). A buffer groove (10) adapted to the buffer inclined nipple (9) is provided on the back of the inner buffer strip (6).

5. The battery module built-in aerogel composite separator structure according to claim 1, characterized in that, The polyester fiber protective layers (5) located on both sides are interconnected by multiple traction fibers (11) that penetrate the isolation frame (1), and the traction fibers (11) are connected to the outer expansion cylinder (102) through branch fibers.

6. The battery module built-in aerogel composite separator structure according to claim 1, characterized in that, The transfer bearing airbag (2) is interconnected through tiny tubes distributed between the flexible aerogel fillers (3) to realize the delivery of gas inside the transfer bearing airbag (2).

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