Lithium battery aerogel heat insulation sheet packaging flame-retardant thermosetting film

Abstract

The utility model provides a lithium battery aerogel heat insulation sheet packaging flame-retardant thermosetting film which comprises a glass fiber aerogel heat insulation sheet, and a PET (Polyethylene Terephthalate)-based thermosetting film is arranged on the outer layer of the glass fiber aerogel heat insulation sheet; a glass fiber aerogel heat insulation sheet with extremely low heat conductivity, good mechanical strength and light weight characteristics and a PET-based thermosetting film with good chemical resistance and mechanical properties are compounded to form the thermosetting film, and a graphene soft ceramic sheet is arranged between the glass fiber aerogel heat insulation sheet and the PET-based thermosetting film for heat conduction and flame retardance, so that the high temperature resistance, corrosion resistance and flame retardance of the thermosetting film are greatly improved; the heat-conducting graphene sheet layers at different layers are connected through the metal mixed graphite column, so that the heat of the inner layer can be timely conducted out, the change of the structure and the property of the glass fiber aerogel caused by heat stacking of the thermosetting film is avoided, the lithium battery packaged by the thermosetting film can keep a stable working temperature in a high-temperature environment, thermal runaway does not occur under a short-circuit condition, and the service life of the lithium battery is prolonged. In a combustion test, the PET-based thermosetting film material effectively prevents flame spreading and has good working efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery heat insulation sheet technology, specifically to a flame-retardant thermosetting film for encapsulating lithium battery aerogel heat insulation sheet. Background Technology

[0002] Thermal insulation materials in the new energy field include fiber felt, foam, mica sheets, and aerogel materials. In recent years, aerogel materials have seen extensive research and application, proving their numerous advantages as thermal insulation materials. In the new energy vehicle field, aerogel materials are used not only for thermal insulation and shock absorption between the vehicle body, modules, and shell, and as external cold-proof and high-temperature insulation layers for battery boxes, but also for thermal insulation and flame retardancy between power battery cells. Currently, electric vehicles primarily use lithium-ion batteries as their power source, but under extreme conditions, battery thermal runaway poses safety risks, such as fires caused by battery overcharging. In this context, aerogel cell insulation sheets are used between cells and modules to provide thermal isolation, effectively preventing safety accidents caused by cell thermal runaway.

[0003] Currently, commonly used aerogel materials, such as silicone gel felt, possess good thermal insulation properties and certain temperature resistance and fire resistance, showing promising application prospects. Researchers have conducted extensive studies on this technology, achieving positive results. For example, Chinese patent application CN 114883736A (under examination) discloses an aerogel battery cell thermal insulation sheet, its preparation method, and its application. This method involves preparing an aerogel battery cell thermal insulation sheet by combining fiberglass mesh, aerogel composite slurry, and fiberglass felt. This insulation sheet exhibits high strength, is not easily deformed, and has good thermal stability. However, this method involves complex components, resulting in a complex mixing process, high preparation costs, and insufficient mechanical properties.

[0004] Furthermore, existing aerogels suffer from poor mechanical properties, high manufacturing costs, and insufficient thermal stability and fire resistance, making them increasingly unable to meet the demands of current technological advancements for battery cell insulation materials. Therefore, reducing the manufacturing cost of aerogel materials and further improving their properties, including heat resistance, flame retardancy, and mechanical properties, remains a hot topic and a challenge in the industry. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a flame-retardant thermosetting film for encapsulating lithium-ion battery aerogel insulation sheets. It combines a glass fiber aerogel insulation sheet with extremely low thermal conductivity, good mechanical strength, and lightweight properties with a PET-based thermosetting film possessing excellent chemical resistance and mechanical properties. A graphene soft ceramic sheet is placed between the layers for thermal conductivity and flame retardancy, significantly improving the thermosetting film's high-temperature resistance, corrosion resistance, and flame retardancy. Connecting different layers of thermally conductive graphene sheets with metal-mixed graphite pillars facilitates timely heat dissipation from the inner layers, preventing heat buildup in the thermosetting film from altering the structure and properties of the glass fiber aerogel. The lithium-ion battery encapsulated with this thermosetting film maintains a stable operating temperature under high-temperature conditions and does not experience thermal runaway under short-circuit conditions. In combustion tests, the PET-based thermosetting film material effectively prevents flame spread.

[0006] To achieve the objective of this utility model, the technical solution adopted is as follows:

[0007] A flame-retardant thermosetting film encapsulating a lithium battery aerogel insulation sheet includes a glass fiber aerogel insulation sheet, with a PET-based thermosetting film disposed on the outer layer of the glass fiber aerogel insulation sheet; a thermally conductive graphene soft ceramic sheet is disposed between the glass fiber aerogel insulation sheet and the PET-based thermosetting film; a plurality of thermally conductive filling vertical well holes penetrating the glass fiber aerogel insulation sheet and the PET-based thermosetting film are disposed between the inner thermally conductive graphene soft ceramic sheets; and thermally conductive metal-mixed graphite soft pillars are filled inside the thermally conductive filling vertical well holes.

[0008] As a preferred technical solution, the thickness of the fiberglass aerogel insulation sheet is set to 2.0 mm, the density to 0.15 g / cm³, the thermal conductivity to 0.018 W / m·K, and the tensile strength to 0.5 MPa.

[0009] As a preferred technical solution, the PET-based thermosetting film has a thickness of 0.3 mm, a flame retardant rating of UL94 V-0, and a temperature resistance range of -40 ℃ to 150 ℃.

[0010] As a preferred technical solution, the fiberglass aerogel insulation sheet, the PET-based thermosetting film, and the thermally conductive graphene soft ceramic sheet are all provided with at least two layers. The thermally conductive filling vertical well hole penetrates through the inner layers of the fiberglass aerogel insulation sheet and the PET-based thermosetting film and then comes into direct contact with the thermally conductive graphene soft ceramic sheet.

[0011] As a preferred technical solution, the thermally conductive metal-mixed graphite soft pillars filled inside the thermally conductive filling shaft holes penetrate at least one layer of fiberglass aerogel insulation sheet and PET-based thermosetting film and then come into direct contact with the thermally conductive graphene soft ceramic sheet.

[0012] As a preferred technical solution, the thickness of the fiberglass aerogel insulation sheet is greater than or equal to the sum of the thicknesses of the PET-based thermosetting film and the thermally conductive graphene soft ceramic sheet, wherein the thickness of the PET-based thermosetting film is greater than or equal to the thickness of the thermally conductive graphene soft ceramic sheet.

[0013] As a preferred technical solution, fiberglass aerogel insulation sheet, PET-based thermosetting film and thermally conductive graphene soft ceramic sheet are stacked in sequence. The thermally conductive graphene soft ceramic sheets of adjacent layers are connected by thermally conductive filling vertical well holes and thermally conductive metal mixed graphite soft pillars. The thermally conductive filling vertical well holes of adjacent thermally conductive graphene soft ceramic sheets are staggered.

[0014] This utility model provides a flame-retardant thermosetting film for encapsulating lithium battery aerogel heat insulation sheet, which has the following advantages:

[0015] This invention relates to a thermosetting film that combines a glass fiber aerogel insulation sheet with extremely low thermal conductivity, good mechanical strength, and lightweight properties with a PET-based thermosetting film that has good chemical resistance and mechanical properties. A graphene soft ceramic sheet is placed between the layers for thermal conductivity and flame retardancy, significantly improving the thermosetting film's high-temperature resistance, corrosion resistance, and flame retardancy. Connecting different layers of thermally conductive graphene sheets with metal-mixed graphite pillars facilitates timely heat dissipation from the inner layers, preventing heat buildup in the thermosetting film from altering the structure and properties of the glass fiber aerogel. The lithium battery encapsulated with this thermosetting film maintains a stable operating temperature under high-temperature conditions and does not experience thermal runaway under short-circuit conditions. In combustion tests, the PET-based thermosetting film material effectively prevents flame spread, demonstrating good working efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the flame-retardant thermosetting film encapsulated in the lithium battery aerogel heat insulation sheet of this utility model.

[0017] In the figure: 1. Fiberglass aerogel insulation sheet; 2. PET-based thermosetting film; 3. Thermally conductive graphene soft ceramic sheet; 4. Thermally conductive filling shaft hole; 5. Thermally conductive metal-mixed graphite soft column. Detailed Implementation

[0018] The present invention will be further described and illustrated below with reference to specific embodiments and accompanying drawings.

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model. Example 1

[0021] like Figure 1 As shown, a lithium battery aerogel heat insulation sheet encapsulating a flame-retardant thermosetting film includes a glass fiber aerogel heat insulation sheet 1, with a PET-based thermosetting film 2 disposed on the outer layer of the glass fiber aerogel heat insulation sheet 1; a thermally conductive graphene soft ceramic sheet 3 is disposed between the glass fiber aerogel heat insulation sheet 1 and the PET-based thermosetting film 2; a plurality of thermally conductive filling vertical well holes 4 penetrating the glass fiber aerogel heat insulation sheet 1 and the PET-based thermosetting film 2 are disposed between the inner thermally conductive graphene soft ceramic sheets 3; and thermally conductive metal mixed graphite soft pillars 5 are filled inside the thermally conductive filling vertical well holes 4.

[0022] Furthermore, the thickness of the glass fiber aerogel insulation sheet 1 is set to 2.0 mm, the density to 0.15 g / cm³, the thermal conductivity to 0.018 W / m·K, and the tensile strength to 0.5 MPa.

[0023] Furthermore, the PET-based thermosetting film 2 has a thickness of 0.3 mm, a flame retardant rating of UL94 V-0, and a temperature resistance range of -40 ℃ to 150 ℃.

[0024] Furthermore, the fiberglass aerogel insulation sheet 1, the PET-based thermosetting film 2, and the thermally conductive graphene soft ceramic sheet 3 are all provided with at least two layers, and the thermally conductive filling vertical well hole 4 penetrates through the inner layers of the fiberglass aerogel insulation sheet 1 and the PET-based thermosetting film 2 and then comes into direct contact with the thermally conductive graphene soft ceramic sheet 3.

[0025] Furthermore, the thermally conductive metal-mixed graphite soft pillar 5, which is filled inside the thermally conductive filling shaft hole 4, penetrates at least one layer of glass fiber aerogel insulation sheet 1 and PET-based thermosetting film 2 and then comes into direct contact with the thermally conductive graphene soft ceramic sheet 3.

[0026] Furthermore, the thickness of the glass fiber aerogel insulation sheet 1 is greater than or equal to the sum of the thicknesses of the PET-based thermosetting film 2 and the thermally conductive graphene soft ceramic sheet 3, and the thickness of the PET-based thermosetting film 2 is greater than or equal to the thickness of the thermally conductive graphene soft ceramic sheet 3.

[0027] Furthermore, the fiberglass aerogel insulation sheet 1, the PET-based thermosetting film 2, and the thermally conductive graphene soft ceramic sheet 3 are stacked in sequence. The thermally conductive graphene soft ceramic sheets 3 of adjacent layers are connected by thermally conductive filling vertical well holes 4 and thermally conductive metal mixed graphite soft pillars 5. The thermally conductive filling vertical well holes 4 of adjacent thermally conductive graphene soft ceramic sheets 3 are staggered.

[0028] A hot-pressing process is employed to ensure a tight bond between the fiberglass aerogel insulation sheet and the PET-based thermosetting film material, forming a stable multilayer structure. First, the fiberglass aerogel insulation sheet is cut into a shape matching the size of the lithium battery. Then, it is laminated with the PET-based thermosetting film material using a hot-pressing process to form the encapsulation material. Finally, the encapsulation material is applied during the lithium battery encapsulation process; and the encapsulated lithium battery undergoes high-temperature testing, short-circuit testing, and combustion testing.

[0029] The glass fiber aerogel insulation sheet 1 has extremely low thermal conductivity and good mechanical strength, which can effectively isolate heat transfer and withstand certain mechanical stress. It can effectively ensure that the thermosetting film can maintain a stable working temperature in high-temperature environments, avoiding overheating of the lithium battery and damage to its internal structure. The PET-based thermosetting film 2 can form a stable carbonized layer at high temperatures, preventing flame spread. It also has good chemical resistance and mechanical properties, so the heat generated by the lithium battery can be dissipated in time and combined with the thermally conductive graphene soft ceramic sheet 3 for lithium battery heat dissipation. The encapsulated lithium battery can maintain a stable working temperature in high-temperature environments and does not experience thermal runaway under short-circuit conditions. In the combustion test, the PET-based thermosetting film material effectively prevented the spread of flames. Example 2

[0030] The difference between this embodiment and Embodiment 1 is that:

[0031] like Figure 1 As shown, a lithium battery aerogel heat insulation sheet is encapsulated with a flame-retardant thermosetting film. A graphene thermal conductive sheet is coated on the inner surface of the PET-based thermosetting film 2. That is, a graphene thermal conductive sheet is set between the glass fiber aerogel heat insulation sheet 1 and the PET-based thermosetting film 2. At this time, the thermosetting film only has 3 layers, which can achieve similar technical effects. Example 3

[0032] The difference between this embodiment and embodiments 1 and 2 is that:

[0033] like Figure 1 As shown, a flame-retardant thermosetting film is encapsulated in a lithium battery aerogel heat insulation sheet. A heat-conducting aluminum foil layer is disposed between the glass fiber aerogel heat insulation sheet 1 and the PET-based thermosetting film 2. A graphene heat-conducting sheet is disposed between the PET-based thermosetting film 2 and the heat-conducting aluminum foil layer to directly conduct heat to the outside. A flame-retardant soft ceramic layer is disposed between the glass fiber aerogel heat insulation sheet 1 and the heat-conducting aluminum foil layer to enhance the flame-retardant effect of the glass fiber aerogel.

[0034] In this invention, a glass fiber aerogel insulation sheet with extremely low thermal conductivity, good mechanical strength, and lightweight properties is composited with a PET-based thermosetting film with good chemical resistance and mechanical properties to form a thermosetting film. Graphene soft ceramic sheets are placed between the layers for thermal conductivity and flame retardancy, greatly improving the high-temperature resistance, corrosion resistance, and flame retardancy of the thermosetting film. Connecting different layers of thermally conductive graphene sheets with metal-mixed graphite pillars facilitates timely heat dissipation from the inner layers, preventing heat buildup in the thermosetting film from altering the structure and properties of the glass fiber aerogel. The lithium battery encapsulated with the thermosetting film can maintain a stable operating temperature under high-temperature conditions and does not experience thermal runaway under short-circuit conditions. In combustion tests, the PET-based thermosetting film material effectively prevents flame spread and exhibits good working efficiency.

[0035] The technical solutions disclosed in the embodiments of this utility model have been described in detail above. Specific embodiments have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A lithium battery aerogel thermal barrier sheet encapsulated flame retardant thermoset film, characterized by: The glass fiber aerogel thermal insulation sheet (1) is provided with a PET-based thermosetting film (2) on the outer layer. The glass fiber aerogel thermal insulation sheet (1) is provided with a heat-conducting graphene soft porcelain sheet (3) between the PET-based thermosetting film (2), and a plurality of heat-conducting filling vertical shaft holes (4) penetrating the glass fiber aerogel thermal insulation sheet (1) and the PET-based thermosetting film (2) are arranged between the heat-conducting graphene soft porcelain sheets (3) in the inner layer, and a heat-conducting metal mixed graphite soft column (5) is arranged inside the heat-conducting filling vertical shaft hole (4).

2. The lithium battery aerogel thermal barrier sheet encapsulated flame- retardant thermoset film of claim 1, wherein: The thickness of the glass fiber aerogel thermal insulation sheet (1) is set to 2.0 mm, the density is set to 0.15 g / cm³, the thermal conductivity is set to 0.018 W / m·K, and the tensile strength is set to 0.5 MPa.

3. The lithium battery aerogel separator encapsulated flame retardant thermoset film of claim 1, wherein: The thickness of the PET-based thermosetting film (2) is set to 0.3 mm, the flame-retardant level is UL94 V-0 level, and the temperature resistance range is -40 ℃ to 150 ℃.

4. The lithium battery aerogel separator encapsulated flame retardant thermoset film of claim 1, wherein: The glass fiber aerogel thermal insulation sheet (1), the PET-based thermosetting film (2), and the heat-conducting graphene soft porcelain sheet (3) are each provided with at least 2 layers, and the heat-conducting filling vertical shaft hole (4) is in direct contact with the heat-conducting graphene soft porcelain sheet (3) after penetrating the glass fiber aerogel thermal insulation sheet (1) and the PET-based thermosetting film (2) in the inner layer.

5. The lithium battery aerogel separator encapsulated flame retardant thermoset film of claim 4, wherein: The heat-conducting metal mixed graphite soft column (5) arranged inside the heat-conducting filling vertical shaft hole (4) is in direct contact with the heat-conducting graphene soft porcelain sheet (3) after penetrating at least one layer of the glass fiber aerogel thermal insulation sheet (1) and the PET-based thermosetting film (2).

6. The lithium battery aerogel separator encapsulated flame resistant thermoset film of claim 2, wherein: The thickness of the glass fiber aerogel thermal insulation sheet (1) is greater than or equal to the sum of the thicknesses of the PET-based thermosetting film (2) and the heat-conducting graphene soft porcelain sheet (3), and the thickness of the PET-based thermosetting film (2) is greater than or equal to the thickness of the heat-conducting graphene soft porcelain sheet (3).

7. The lithium battery aerogel separator encapsulated flame resistant thermoset film of claim 1, wherein: The glass fiber aerogel thermal insulation sheet (1), the PET-based thermosetting film (2), and the heat-conducting graphene soft porcelain sheet (3) are stacked in sequence, the heat-conducting graphene soft porcelain sheets (3) between adjacent two layers are connected through the heat-conducting filling vertical shaft hole (4) and the heat-conducting metal mixed graphite soft column (5), and the heat-conducting filling vertical shaft holes (4) between the heat-conducting graphene soft porcelain sheets (3) between adjacent two layers are staggered.

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