Heat insulation sheet and battery module comprising same

Abstract

The utility model belongs to the technical field of batteries. The utility model provides a heat insulation sheet and a battery module comprising the same, and the heat insulation sheet comprises a nanometer heat insulation plate, a ceramic silicone rubber frame surrounding the nanometer heat insulation plate, and thermoplastic film layers covering two opposite side surfaces of the nanometer heat insulation plate and the ceramic silicone rubber frame. Through the structure that the ceramic silicon rubber frame is used for framing the nano heat insulation plate, the heat insulation sheet can be ensured to have enough expansion gaps and breathing distances when being arranged among the battery cells, and the heat insulation performance of the nano heat insulation plate can be fully exerted, so that the heat insulation effect of the battery cells is good; and the thermoplastic films on the two sides are matched with the ceramic silicon rubber frame to integrally package the nano heat insulation plate, so that the problems of powder falling and damage of the nano heat insulation plate are effectively solved, the mechanical strength of the nano heat insulation plate is enhanced, and meanwhile, the overall elasticity is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology and relates to a heat insulation sheet and a battery module containing the same. Background Technology

[0002] With the rapid development of new energy technologies, especially the expanding applications of high-performance, high-density batteries in electric vehicles, two-wheeled electric vehicles, and drones, battery safety and stability have become crucial factors. The cell heat shield in a battery module, as a key safety component, plays a vital role in isolating the cells, preventing short circuits, and controlling heat transfer. To ensure the stability and safety of battery modules and extend their lifespan, the design and material selection of the heat shield have become an important research direction.

[0003] To ensure the safety and performance of the battery pack, the material of the heat shield usually needs to have a low thermal conductivity to effectively slow down heat transfer and protect the cells from excessive heat. At the same time, it should have a certain degree of elasticity to ensure that there is sufficient expansion gap and breathing distance between the cells to prevent the cells from being squeezed together and damaged during thermal expansion and contraction.

[0004] Currently, the most commonly used heat insulation sheet materials on the market include nano-insulation boards, mica heat insulation sheets, aerogel heat insulation sheets, foam plastics, super cotton, glass wool, and high-silica cotton. Each of these materials has its own advantages and disadvantages. Among them, the chemical stability and aging performance of foam plastics are greatly affected by the material and environment, and cannot withstand the high temperatures of over 800°C during battery thermal runaway; although super cotton, glass wool, and high-silica cotton have good heat insulation performance, they are easily punctured and cannot withstand the expansion of the battery cell during battery thermal runaway; although mica heat insulation sheets have good heat insulation performance, their performance, especially stability, can be affected under certain extreme conditions. In addition, mica sheets are usually quite thick, which is not conducive to the space optimization of battery modules; while aerogel heat insulation sheets also have good heat insulation performance, their cost is high, and they are difficult to process, making it difficult to achieve mass production.

[0005] Nano-insulation panels not only have a lower thermal conductivity but can also be made thinner, saving space and offering greater cost-effectiveness. They are also easier to process and mold, making them suitable for large-scale applications. Therefore, nano-insulation panels, with their superior thermal insulation performance, are a more advantageous choice than mica insulation sheets and aerogel insulation sheets.

[0006] However, nano-insulation panels are easily damaged by external forces during actual use, especially during battery module assembly. Improper handling may cause the nano-insulation panels to break. At the same time, since the nano-insulation panels are composed of nano-sized particles, long-term use or vibration environments may cause powder shedding, affecting the cleanliness and insulation performance of the battery module.

[0007] In view of the above problems, it is particularly important to develop a new type of thermal insulation sheet structure and solution, which should have excellent thermal insulation performance, be simple and reliable in structure, have cost advantages, be easy to mass-produce, and ensure reliability and stability in long-term use. Utility Model Content

[0008] In view of the problems existing in the prior art, the purpose of this utility model is to provide a heat insulation sheet and a battery module containing the same. The heat insulation sheet includes a nano-insulation plate, a ceramicized silicone rubber frame surrounding the nano-insulation plate, and a thermoplastic film layer covering two opposite sides of the nano-insulation plate and the ceramicized silicone rubber frame. The structure of the nano-insulation plate enclosed by the ceramicized silicone rubber frame ensures sufficient expansion gap and breathing distance when the heat insulation sheet is placed between the battery cells, while also fully utilizing the heat insulation performance of the nano-insulation plate, resulting in good heat insulation effect between the battery cells. Furthermore, the overall encapsulation structure of the nano-insulation plate by the double-sided thermoplastic film combined with the ceramicized silicone rubber frame effectively improves the problems of powder shedding and breakage of the nano-insulation plate, strengthening its mechanical strength while maintaining overall elasticity.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a heat insulation sheet, comprising a nano-insulation board, a ceramicized silicone rubber frame surrounding the nano-insulation board, and a thermoplastic film layer covering two opposite sides of the nano-insulation board and the ceramicized silicone rubber frame.

[0011] The nano-insulation board layer in this invention possesses excellent thermal insulation performance, exhibiting low thermal conductivity and high insulation performance at room temperature, high temperature, and low temperature. However, during battery pack assembly, the nano-insulation board suffers from edge fragility and surface powder shedding. The ceramicized silicone rubber frame in this invention serves to seal and fix the nano-insulation board, enhancing its ease of use and reducing edge damage. Simultaneously, the ceramicized silicone rubber frame's elasticity and deformation capacity in the thickness direction ensure sufficient expansion gap and breathing distance when the insulation sheet is placed between battery cells. The thermoplastic film layer in this invention, combined with the ceramicized silicone rubber frame, forms an encapsulation structure for the nano-insulation board, further resolving the powder shedding problem and improving the overall stability of the insulation sheet.

[0012] The following are preferred technical solutions of this utility model, but are not intended to limit the technical solutions provided by this utility model. Through the following technical solutions, the technical objectives and beneficial effects of this utility model can be better achieved and realized.

[0013] As a preferred technical solution of this utility model, the thickness of the nano-insulation board is 1 to 4 mm, such as 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm or 4 mm, but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0014] As a preferred technical solution of this utility model, the thickness of the ceramicized silicone rubber frame is 2 to 5 mm, such as 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, or 5 mm, but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0015] As a preferred technical solution of this utility model, the thickness of the thermoplastic film layer is 0.5 to 1 mm, such as 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm, but is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0016] As a preferred embodiment of this invention, the thickness of the nano-insulation board is less than or equal to the thickness of the ceramicized silicone rubber frame.

[0017] As a preferred technical solution of this utility model, the total thickness of the heat insulation sheet is 3 to 7 mm, such as 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, or 7 mm, but it is not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0018] As a preferred technical solution of this utility model, the nano-insulation board includes any one of nano-silica insulation board, nano-alumina insulation board, nanoporous silica insulation board or nano-ceramic fiber insulation board.

[0019] As a preferred technical solution of this utility model, the thermoplastic film layer includes any one of PI film, PET film, OPP film or PVC film.

[0020] As a preferred technical solution of this utility model, the ceramicized silicone rubber frame includes a ceramicized methyl ethyl silicone rubber frame.

[0021] This invention does not limit the specific composition and preparation method of the ceramicized silicone rubber frame; adjustments and selections should be made reasonably according to actual needs and circumstances. Generally, the components of ceramicized silicone rubber mainly include a silicone rubber matrix, ceramic filler, flux, reinforcing agent, and vulcanizing agent.

[0022] For example, the ceramicized silicone rubber frame described in this utility model, by mass fraction, comprises 100 parts of methyl ethyl silicone rubber compound, 20-50 parts of glass powder, 20-50 parts of fumed silica, 30-50 parts of wollastonite, and 1-3 parts of vulcanizing agent. The glass powder can be in quantities of 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 parts; the fumed silica can be in quantities of 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, or 35 parts. The amounts can be 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 parts; the wollastonite can be 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50 parts; the vulcanizing agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, but are not limited to the listed values; other data within the above range are also applicable. In this case, the resulting ceramicized silicone rubber frame is a ceramicized methyl ethyl silicone rubber frame.

[0023] Preferably, the vulcanizing agent comprises dimethyl disulfide.

[0024] This invention uses a specific ratio of methyl ethyl silicone rubber compound, glass powder, fumed silica, silica lime, and vulcanizing agent, which can be used to prepare ceramicized silicone rubber. Compared with ordinary silicone rubber, this ceramicized silicone rubber has a higher decomposition temperature and can be sintered into dense ceramic at high temperature, ensuring the integrity of the heat insulation sheet structure between the battery cells in the event of thermal runaway.

[0025] For example, the preparation method of the ceramicized methyl ethyl silicone rubber frame includes mixing and stirring methyl ethyl silicone rubber compound, glass powder, fumed silica, wollastonite, and vulcanizing agent; placing the resulting mixture into a frame mold, and performing a first hot pressing at 140–160°C and 10–30 MPa for 30 minutes, followed by cold pressing at room temperature and 5 MPa for 5 minutes to complete the preparation of the ceramicized silicone rubber frame. The temperature of the first hot pressing can be 140°C, 145°C, 150°C, 155°C, or 160°C, etc., and the pressure of the first hot pressing can be 10 MPa, 15 MPa, 20 MPa, 25 MPa, or 30 MPa, etc., but is not limited to the listed values; other unlisted values ​​within the above range are also applicable.

[0026] This utility model does not limit the manufacturing or assembly method of the heat insulation sheet, and reasonable adjustments and selections should be made according to actual needs and circumstances.

[0027] For example, the assembly method of the heat insulation sheet includes placing a nano-insulation board into a ceramicized silicone rubber frame to obtain a composite, attaching a thermoplastic film to both opposite sides of the composite, and placing it in a vacuum hot press for a second hot press. The temperature of the second hot press is controlled at 120-150°C, the pressure at 5-10 MPa, and the hot press time at 10-30 s, thereby completing the encapsulation of the heat insulation sheet and forming a thermoplastic membrane layer to obtain the heat insulation sheet. The temperature of the second hot press can be 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, or 150°C, etc.; the pressure of the second hot press can be 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, or 10 MPa, etc.; and the time of the second hot press can be 10 s, 15 s, 20 s, 25 s, or 30 s, etc., but is not limited to the listed values; other unlisted values ​​within the above range are also applicable.

[0028] As a preferred embodiment of this invention, the density of the ceramicized silicone rubber frame is ≤1.85 g / cm³. 3 For example, 1.85g / cm 3 1.83g / cm 3 1.80g / cm 3 1.78g / cm 3 Or 1.75g / cm 3 Equivalents include: tensile strength ≥ 3 MPa (e.g., 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, or 5 MPa); elongation at break ≥ 200% (e.g., 200%, 220%, 250%, 280%, or 300%); dielectric strength ≥ 10 kV / mm (e.g., 10 kV / mm, 11 kV / mm, 12 kV / mm, 13 kV / mm, 14 kV / mm, or 15 kV / mm); and insulation resistance ≥ 2.5 × 10⁻⁶. 12Ω, for example 2.5*10 12 Ω, 2.8*10 12 Ω, 3*10 12 Ω, 3.5*10 12 Ω, 4*10 12 Ω, 4.5*10 12 Ω or 5*10 12 Ω, etc.; after being burned at 1200℃ for 10 minutes, the dielectric strength is ≥2.7kV / mm, such as 2.7kV / mm, 3kV / mm, 3.2kV / mm, 3.5kV / mm, 3.8kV / mm or 4kV / mm, etc., but not limited to the listed values. Other unlisted values ​​within the above range are also applicable.

[0029] As a preferred embodiment of this invention, the density of the nano-insulation board is 0.22 g / cm³. 3 ~0.32g / cm 3 For example, 0.22 g / cm³ 3 0.25g / cm 3 0.28g / cm 3 0.3g / cm 3 Or 0.32g / cm 3 Etc.; thermal conductivity is 0.021~0.034W / mK, insulation resistance ≥1*10 9 Ω, for example, 1*10 9 Ω, 1.2*10 9 Ω, 1.4*10 9 Ω, 1.6*10 9 Ω, 1.8*10 9 Ω or 2*10 9 Ω, etc.; dielectric strength ≥7kV / mm, such as 7kV / mm, 8kV / mm, 9kV / mm, 10kV / mm, 11kV / mm or 12kV / mm, etc., but not limited to the listed values, other unlisted values ​​within the above range also apply.

[0030] Secondly, this utility model provides a battery module containing the heat insulation sheet described in the first aspect and disposed between the battery cells.

[0031] Compared with existing technical solutions, this utility model has at least the following beneficial effects:

[0032] This invention utilizes a ceramicized silicone rubber frame to enclose the nano-insulation board, ensuring sufficient expansion gap and breathing distance when the insulation sheet is placed between the battery cells. This also fully leverages the insulation performance of the nano-insulation board, resulting in excellent insulation between the battery cells. Furthermore, the overall encapsulation structure of the nano-insulation board, using a double-sided thermoplastic film in conjunction with the ceramicized silicone rubber frame, effectively improves the issues of powder shedding and breakage of the nano-insulation board. This enhances its mechanical strength while maintaining overall elasticity, thereby improving the consistency and stability of the insulation sheet assembly and use. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the heat insulation sheet described in this utility model;

[0034] Figure 2 This is a schematic diagram of the assembly of the nano-insulation board and the ceramicized silicone rubber frame in the heat insulation sheet of this utility model;

[0035] In the figure: 1-Thermoplastic film layer, 2-Ceramicized silicone rubber frame, 3-Nano insulation board. Detailed Implementation

[0036] The technical solution of this utility model will be further illustrated below through specific embodiments.

[0037] Those skilled in the art should understand that the embodiments described are merely to help understand the present invention and should not be regarded as specific limitations on the present invention.

[0038] Example 1

[0039] This embodiment provides a heat insulation sheet, such as Figure 1 As shown, the heat insulation sheet includes a 4mm thick nano-insulation board 3, a 5mm thick ceramicized silicone rubber frame 2 surrounding the nano-insulation board 3, and a 0.5mm thick thermoplastic film layer 1 covering two opposite sides of the nano-insulation board 3 and the ceramicized silicone rubber frame 2; the nano-insulation board 3 is a nano-silica insulation board, the ceramicized silicone rubber frame 2 is a ceramicized methyl ethyl silicone rubber frame, and the thermoplastic film layer 1 is a PET film.

[0040] The heat insulation sheet is obtained by the following preparation and assembly methods:

[0041] (1) Mix 20g of methyl ethyl silicone rubber compound, 4g of glass powder, 4g of fumed silica, 6g of wollastonite and 0.2g of dimethyl disulfide evenly.

[0042] (2) The mixture obtained in step (1) is introduced into a frame mold with a thickness of 5 mm and subjected to a first hot pressing at 140 °C and 15 MPa for 30 min. Then, it is cold pressed at room temperature and 5 MPa for 5 min to prepare a ceramicized silicone rubber frame 2 with a thickness of 5 mm;

[0043] (3) Place the 4mm nano-insulation plate 3 into the ceramicized silicone rubber frame 2 prepared in step (2) to obtain a composite, such as Figure 2 As shown;

[0044] (4) Use a 0.8 mm thick PET film, place it on two opposite sides of the composite prepared in step (3), and then put it into a vacuum hot press at a temperature of 120°C and a pressure of 5 MPa for a second hot press for 20 seconds to form a thermoplastic film layer and obtain a heat insulation sheet.

[0045] Example 2

[0046] This embodiment provides a heat insulation sheet, such as Figure 1 As shown, the heat insulation sheet includes a 4mm thick nano-insulation board 3, a 5mm thick ceramicized silicone rubber frame 2 surrounding the nano-insulation board 3, and a 0.5mm thick thermoplastic film layer 1 covering two opposite sides of the nano-insulation board 3 and the ceramicized silicone rubber frame 2; the nano-insulation board 3 is a nano-alumina insulation board, the ceramicized silicone rubber frame 2 is a ceramicized methyl ethyl silicone rubber frame, and the thermoplastic film layer 1 is a PET film.

[0047] The heat insulation sheet is obtained by the following preparation and assembly methods:

[0048] (1) Mix 20g of methyl ethyl silicone rubber compound, 5g of glass powder, 6g of fumed silica, 7g of wollastonite and 0.4g of dimethyl disulfide evenly.

[0049] (2) The mixture obtained in step (1) is introduced into a frame mold with a thickness of 5 mm and subjected to a first hot pressing at 140 °C and 15 MPa for 30 min. Then, it is cold pressed at room temperature and 5 MPa for 5 min to prepare a ceramicized silicone rubber frame 2 with a thickness of 5 mm;

[0050] (3) Place the 4mm nano-insulation plate 3 into the ceramicized silicone rubber frame 2 prepared in step (2) to obtain a composite, such as Figure 2 As shown;

[0051] (4) Using a 0.5 mm thick PET film, place it on two opposite sides of the composite prepared in step (3), and then put it into a vacuum hot press at a temperature of 120°C and a pressure of 5 MPa for 20 seconds to form a thermoplastic film layer, thus obtaining the heat insulation sheet.

[0052] Example 3

[0053] This embodiment provides a heat insulation sheet, such as Figure 1 As shown, the heat insulation sheet includes a 4mm thick nano-insulation board 3, a 5mm thick ceramicized silicone rubber frame 2 surrounding the nano-insulation board 3, and a 0.5mm thick thermoplastic film layer 1 covering two opposite sides of the nano-insulation board 3 and the ceramicized silicone rubber frame 2; the nano-insulation board 3 is a nanoporous silicone insulation board, the ceramicized silicone rubber frame 2 is a ceramicized methyl ethyl silicone rubber frame, and the thermoplastic film layer 1 is a PET film.

[0054] The heat insulation sheet is obtained by the following preparation and assembly methods:

[0055] (1) Mix 20g of methyl ethyl silicone rubber compound, 10g of glass powder, 10g of fumed silica, 10g of wollastonite and 0.6g of dimethyl disulfide evenly.

[0056] (2) The mixture obtained in step (1) is introduced into a frame mold with a thickness of 5 mm and subjected to a first hot pressing at 120 °C and 10 MPa for 30 min. Then, it is cold pressed at room temperature and 5 MPa for 5 min to prepare a ceramicized silicone rubber frame 2 with a thickness of 5 mm;

[0057] (3) Place the 4mm nano-insulation plate 3 into the ceramicized silicone rubber frame 2 prepared in step (2) to obtain a composite, such as Figure 2 As shown;

[0058] (4) Using a 0.8 mm thick PET film, place it on two opposite sides of the composite prepared in step (3), and then put it into a vacuum hot press at a temperature of 150°C and a pressure of 5 MPa for 20 seconds to form a thermoplastic film layer, thus obtaining the heat insulation sheet.

[0059] Examples 4 to 6

[0060] Examples 4 to 6 each provide a heat insulation sheet, wherein the thickness of the nano-insulation board 3 is adjusted from 4 mm to 0.7 mm, 1 mm and 4.3 mm respectively. Except for the above, the other conditions are exactly the same as in Example 1.

[0061] Examples 7 to 9

[0062] Examples 7 to 9 each provide a heat insulation sheet, wherein the thickness of the ceramicized silicone rubber frame 2 is adjusted from 5mm to 3mm, 4mm and 6mm respectively. Except for the above, the other conditions are exactly the same as in Example 1.

[0063] Examples 10 to 12

[0064] Examples 10 to 12 each provide a heat insulation sheet, wherein the thickness of the thermoplastic film layer 1 is adjusted from 0.5 mm to 0.2 mm, 1 mm and 1.3 mm respectively. Except for the above, the other conditions are exactly the same as those in Example 1.

[0065] Comparative Example 1

[0066] This comparative example provides a heat insulation sheet that does not use the ceramicized silicone rubber frame 2 or any other frame. Except for the above, the other conditions are exactly the same as in Example 1.

[0067] Comparative Example 2

[0068] This comparative example provides a heat insulation sheet in which a common silicone rubber frame is used instead of the ceramicized silicone rubber frame 2. Except for the above, the other conditions are exactly the same as in Example 1.

[0069] Comparative Example 3

[0070] This comparative example provides a heat insulation sheet in which a mica heat insulation sheet is used instead of the nano heat insulation board 3. Except for the above, the other conditions are exactly the same as those in Example 1.

[0071] Control group 1

[0072] This control group only used the nano-insulation board 3 from Example 1 for subsequent tests.

[0073] It should be noted that when the thickness of the ceramicized silicone rubber frame 2 used in the above embodiments, comparative examples, and control groups is 2-5 mm, the density of the ceramicized silicone rubber frame 2 is ≤1.85 g / cm³. 3 Tensile strength ≥3MPa, elongation at break ≥200%, dielectric strength ≥10kV / mm, insulation resistance ≥2.5*10 12 The dielectric strength is ≥2.7 kV / mm after being burned at 1200℃ for 10 min. Meanwhile, when the thickness of the nano-insulation board 3 used in the above embodiments, comparative examples, and control groups is 1–4 mm, the density of the nano-insulation board 3 is 0.22 g / cm³. 3 ~0.32g / cm 3 The thermal conductivity is 0.021~0.034W / mK, and the insulation resistance is ≥1*10. 9 Ω, dielectric strength ≥7kV / mm.

[0074] Characterization and Testing

[0075] I. The ceramicized silicone rubber frames 2 obtained in Examples 1-3 above were subjected to compressibility tests at 1000 kPa according to the GB / T 7757-2009 standard for determination of compressive stress-strain properties. The results are shown in Table 1.

[0076] Table 1

[0077]

[0078] As can be seen from the test data in Table 1, the ceramicized silicone rubber frame 2 obtained by this invention has sufficient compression performance, which can ensure sufficient expansion gap and breathing distance between the battery cells.

[0079] II. The heat insulation sheets obtained from the above examples, comparative examples, and control groups were subjected to compressibility tests at 1000 kPa according to the GB / T 7757-2009 standard for determination of compressive stress-strain properties. The results are shown in Table 2.

[0080] III. The temperature difference between the cold surfaces of the insulation sheet between the battery cells was tested using a hot plate at 800℃. The results are shown in Table 2.

[0081] Table 2

[0082]

[0083]

[0084] As can be seen from the test data in Table 2, the heat insulation effect of the heat insulation sheet between battery cells designed using this utility model is good, and it basically meets the heat insulation requirements of battery cells on the market.

[0085] In control group 1, the lack of a rubber frame seal and film encapsulation structure resulted in powder shedding upon contact with the surface of the nano-insulation plate, and slight cracks appeared under 1000 kPa pressure. In comparative example 1, the absence of a rubber frame seal structure for the nano-insulation plate meant there was no breathing space for battery expansion, making the nano-insulation plate prone to damage.

[0086] In summary, the structure of this invention, which uses a ceramicized silicone rubber frame to enclose the nano-insulation board, ensures sufficient expansion gap and breathing distance when the insulation sheet is placed between the battery cells, while also fully utilizing the insulation performance of the nano-insulation board, resulting in good insulation effect between the battery cells. Furthermore, the overall encapsulation structure of the nano-insulation board using double-sided thermoplastic films in conjunction with the ceramicized silicone rubber frame effectively improves the problems of powder shedding and damage of the nano-insulation board, strengthens its mechanical strength, and ensures overall elasticity.

[0087] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0089] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A heat insulation sheet, characterized in that, The device includes a nano-insulation board, a ceramicized silicone rubber frame surrounding the nano-insulation board, and a thermoplastic film layer covering two opposite sides of the nano-insulation board and the ceramicized silicone rubber frame; the nano-insulation board includes any one of nano-silica insulation board, nano-alumina insulation board, nanoporous silica insulation board, or nano-ceramic fiber insulation board.

2. The heat insulation sheet according to claim 1, characterized in that, The thickness of the nano-insulation board is 1-4 mm.

3. The heat insulation sheet according to claim 1, characterized in that, The thickness of the ceramicized silicone rubber frame is 2-5 mm.

4. The heat insulation sheet according to claim 1, characterized in that, The thickness of the thermoplastic film layer is 0.5 to 1 mm.

5. The heat insulation sheet according to any one of claims 1-4, characterized in that, The thermoplastic film layer includes any one of PI film, PET film, OPP film or PVC film.

6. The heat insulation sheet according to any one of claims 1-4, characterized in that, The ceramicized silicone rubber frame includes a ceramicized methyl ethyl silicone rubber frame.

7. The heat insulation sheet according to any one of claims 1-4, characterized in that, The density of the ceramicized silicone rubber frame is ≤1.85 g / cm³. 3 Tensile strength ≥3MPa, elongation at break ≥200%, dielectric strength ≥10kV / mm, insulation resistance ≥2.5*10 12 Ω, after being burned at 1200℃ for 10 minutes, the dielectric strength is ≥2.7kV / mm.

8. The heat insulation sheet according to any one of claims 1-4, characterized in that, The density of the nano-insulation board is 0.22 g / cm³. 3 ~0.32g / cm 3 The thermal conductivity is 0.021~0.034W / mK, and the insulation resistance is ≥1*10. 9 Ω, dielectric strength ≥7kV / mm.

9. A battery module, characterized in that, It contains the heat insulation sheet as described in any one of claims 1-8 and is disposed between the battery cells.

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