Battery protection composite material

Abstract

The invention provides a battery protection composite material. The battery protection composite material comprises a mica layer, a bonding layer, a rubber surface treatment coating and a ceramic silicone rubber layer which are sequentially stacked from top to bottom, and the thickness of the mica layer is greater than or equal to that of the ceramic silicone rubber layer. According to the invention, the specific structure and material of the battery protection composite material are limited, so that the problems of insufficient temperature limit, impact resistance, high-temperature heat insulation and the like of the existing insulation protection layer are solved, and the battery protection composite material has the advantages of high temperature resistance, high-pressure gas impact resistance, good electrical insulating property, good fire resistance and good high-temperature heat insulation performance.

Description

Technical Field

[0001] The invention belongs to the field of batteries and relates to a battery protection composite material. Background Art

[0002] At present, in the battery pack of new energy vehicles, heat dissipation is required between battery cells under normal conditions. When the battery thermally runs away, the impact insulating material is required to have good high temperature resistance, good mechanical strength and good thermal insulation performance.

[0003] The prior art solution discloses an insulating protective layer for a battery metal shell, wherein the opening portion of the shell is 1 to 10 mm as an oxidation protective layer, and the rest is an oxidation layer. After the opening portion of the oxidation protective layer is welded and sealed, a colloidal insulating layer is coated on the outer layer of the shell.

[0004] The prior art solution also discloses a battery protection layer, which includes, from top to bottom, a first glass fiber layer, a first adhesive layer, a mica layer, a second adhesive layer, a second glass fiber layer and a ceramic silicone rubber layer arranged in sequence; the thickness of the mica layer is greater than the thickness of the first glass fiber layer and the thickness of the second glass fiber layer; the thickness of the ceramic silicone rubber layer is greater than the thickness of the first glass fiber layer and the thickness of the second glass fiber layer.

[0005] However, the existing protective layer has deficiencies in temperature limit, impact resistance, high temperature insulation, etc., and cannot meet the requirements under specific working conditions. In addition, the use of too much glass fiber layer is not conducive to the heat dissipation of the battery. Therefore, it is necessary to develop an insulating protective layer that is resistant to high temperature, high pressure gas impact, and high temperature insulation. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a battery protection composite material, and in particular, to provide a fire-resistant, impact-resistant and heat-insulating battery protection composite material. In the present invention, by limiting the specific structure and material of the battery protection composite material, the problems of insufficient temperature limit, impact resistance and high-temperature thermal insulation of the existing insulating protective layer are solved. The composite material has the advantages of resistance to high temperature and high-pressure gas impact, good electrical insulation and fire resistance, and good high-temperature thermal insulation performance.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The present invention provides a battery protection composite material, which comprises a mica layer, an adhesive layer, a rubber surface treatment coating and a ceramic silicone rubber layer stacked in sequence from top to bottom;

[0009] The thickness of the mica layer is greater than or equal to the thickness of the ceramic silicone rubber layer.

[0010] In the present invention, by limiting the specific structure and material of the battery protection composite material, the problems of the existing insulating protective layer in terms of temperature limit, impact resistance and high-temperature thermal insulation are solved. The composite material has the advantages of high temperature resistance, high-pressure gas impact resistance, good electrical insulation and fire resistance, and good high-temperature thermal insulation performance.

[0011] It should be noted that the battery protection composite material provided by the present invention, by taking advantage of the synergistic reinforcement effect between the mica layer and the ceramic silicone rubber layer and limiting the thickness relationship between the two, the ceramic silicone rubber layer in the battery protection composite material has a reinforcement function, which can enhance the fire impact resistance of the mica. The mica layer can achieve better heat insulation and heat dissipation functions by carving gaps, and can be used for heat insulation and protection between battery cells. At the same time, the protective layer still has good electrical insulation properties at a high temperature of 1200°C, which can effectively prevent the impact force of high-pressure gas.

[0012] It should be noted that the mica layer in the present invention has good heat resistance and electrical insulation, which can make the protective layer resistant to high temperature and high pressure gas impact effectively fireproof, and its special structure can effectively dissipate heat and insulate.

[0013] It should be noted that the ceramic silicone rubber layer in the present invention has good fire impact resistance and electrical insulation, which can effectively prevent fire from occurring in the protective layer resistant to high temperature and high pressure gas impact. The material used for the ceramic silicone rubber layer can be BT-751 type or SR1500UFR.

[0014] As a preferred technical solution of the present invention, the thickness of the mica layer is greater than 1.0 mm, for example, it can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., but is not limited to the listed values. Other values ​​not listed within the range are also applicable, preferably 2 to 5 mm.

[0015] The thickness of the mica layer in the present invention is greater than 1.0 mm because within this range, the composite material has strong impact resistance. If it is not within this range, it may result in poor impact resistance and unclear thermal insulation effect.

[0016] As a preferred technical solution of the present invention, the gap ratio of the mica layer is 10 to 90% of the surface area of ​​the battery protection composite material, for example, it can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or 90%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0017] Preferably, the depth of each gap on the mica layer is greater than 0.1 mm, for example, it can be 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, 0.70 mm, 0.80 mm, 0.90 mm, 1.0 mm, etc., but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0018] In the present invention, the gap ratio of the mica layer is 10-90% of the surface area of ​​the battery protection composite material and the depth of each gap on the mica layer is greater than 0.1mm. This is because the thermal insulation effect is good within this range. If it is not within this range, it may lead to poor thermal insulation effect and poor heat dissipation.

[0019] It should be noted that the structure of the mica layer in the present invention specifically takes a 2 mm mica plate as an example, and a depth of more than 0.1 mm is carved downward in a tic-tac-toe pattern, which is the gap depth.

[0020] As a preferred technical solution of the present invention, the thickness of the adhesive layer is greater than 0.01 mm, for example, it can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc., but is not limited to the listed values. Other unlisted values ​​within the range are also applicable, preferably 0.02 to 0.05 mm.

[0021] The thickness of the adhesive layer in the present invention is greater than 0.01 mm because the adhesive effect is best within this range. If it is not within this range, the adhesive effect may be poor and the adhesive may fall off easily.

[0022] As a preferred technical solution of the present invention, the thickness of the rubber surface treatment coating is greater than 0.01 mm, for example, it can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm... etc., but is not limited to the listed values. Other unlisted values ​​within the range are also applicable, preferably 0.02 to 0.05 mm.

[0023] The thickness of the rubber surface treatment coating in the present invention is greater than 0.01 mm, and it belongs to the rubber surface treatment agent. If the thickness is not within this range, it may lead to incomplete treatment, loose adhesion, and easy falling off.

[0024] As a preferred technical solution of the present invention, the thickness of the ceramic silicone rubber layer is greater than 0.5 mm, for example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., but is not limited to the listed values. Other values ​​not listed within the range are also applicable, preferably 2 to 4 mm.

[0025] The thickness of the ceramic silicone rubber layer in the present invention is greater than 0.5 mm. If it is not within this range, the ceramic strength may be too thin and the impact strength may be low.

[0026] As a preferred technical solution of the present invention, the overall thickness of the battery protection composite material is 1.52-10.1 mm, for example, it can be 1.52 mm, 1.53 mm, 1.54 mm, 1.55 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10.0 mm or 10.1 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0027] The overall thickness of the battery protection composite material in the present invention is 1.52-10.1 mm. If it is not within this range, the thickness is too low and the overall strength and thermal insulation are poor; if the thickness is too high, the overall weight is heavy and is not suitable for lightweight new energy vehicles.

[0028] As a preferred technical solution of the present invention, the adhesive layer includes any one of an epoxy resin adhesive layer, a silicone resin adhesive layer or a double-sided adhesive layer.

[0029] It should be noted that the epoxy resin adhesive layer, silicone resin adhesive layer and double-sided adhesive layer in the present invention are all known materials that can be obtained by those skilled in the art in a conventional manner, wherein the epoxy resin adhesive layer can be 3M DP-100, 3MDP2216, the silicone resin adhesive layer can be Kraft K704, Kraft K704NB, and the double-sided adhesive layer can be 3M-9119-140, 3M 55236.

[0030] As a preferred technical solution of the present invention, the rubber surface treatment coating includes a silane coupling agent or a primer.

[0031] It should be noted that the silane coupling agent or primer in the present invention is a known material that can be obtained by a person skilled in the art in a conventional manner, and may be Chemlok 608 or JINDA JD-803.

[0032] As a preferred technical solution of the present invention, the mica layer includes any one of a phlogopite layer, a muscovite layer or a fluoromica layer.

[0033] Exemplarily, the preparation method of the battery protection composite material in the present invention includes:

[0034] The adhesive layer is coated on one side surface of the mica layer, and the one side surface of the ceramic silicone rubber layer is coated with a rubber surface treatment coating and then left to stand for 5 minutes. The glue is a thermosetting glue. At 120°C, the glue bonds the mica layer and the treated ceramic silicone rubber layer to form an integral structure, thereby obtaining a high-temperature, high-pressure gas impact-resistant, high-temperature heat-insulating battery protection composite material having a mica layer, an adhesive layer, a rubber treatment coating and a ceramic silicone rubber layer arranged in sequence from top to bottom.

[0035] When in use, the fire-resistant, impact-insulating battery protection composite material can be cut into any size and placed between battery cells for protection. It can be widely used in gaps such as battery packs, battery covers, and between battery cells.

[0036] It should be noted that the battery protection composite material provided in the present invention can be used in other scenarios requiring high temperature and high pressure impact protection, such as fireproof layer, high temperature resistant layer and other occasions that meet the performance parameters of the material of the present invention. In addition, during use, the ceramic silicone rubber layer can be used as the surface layer, that is, the layer close to the flame. The mica layer is used as a heat insulation layer and a heat dissipation layer.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The battery protection composite material of the present invention has good resistance to high-pressure gas impact, does not age after long-term use, has good electrical insulation, a surface voltage of 10 to 25 kV, has good fire resistance, can withstand a high temperature of up to 1300°C, and still has good electrical insulation performance at a high temperature of 400 to 1300°C; has good thermal insulation performance, and an isolation temperature of 300 to 1000°C; has good resistance to high-pressure gas impact, and the gas pressure is 0.1 to 2.0 MPa.

[0039] (2) The battery protection composite material of the present invention can fully maintain the insulation performance of the electrical equipment in the case of short circuit and fire, and can prevent the impact force of high-pressure gas from damaging other battery cells, and can also isolate the damage to other battery cells caused by temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1A schematic diagram of the structure of a battery protection composite material provided in a specific embodiment of the present invention;

[0041] Figure 2 A schematic top view of a mica layer in a battery protection composite material provided in one specific embodiment of the present invention;

[0042] Among them, 1-mica layer; 2-adhesive layer; 3-rubber surface treatment coating; 4-ceramic silicone rubber layer. DETAILED DESCRIPTION

[0043] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main inventive point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] In one embodiment, the present invention provides a battery protection composite material, such as Figure 1 and Figure 2As shown, the battery protection composite material includes, from top to bottom, a mica layer 1, an adhesive layer 2, a rubber surface treatment coating 3 and a ceramic silicone rubber layer 4 which are stacked in sequence; the thickness of the mica layer 1 is ≥ the thickness of the ceramic silicone rubber layer 4.

[0048] It should be noted that the material used for the ceramic silicone rubber layer 4 in the present invention can be BT-751 type or SR1500UFR.

[0049] Furthermore, the thickness of the mica layer 1 is greater than 1.0 mm, for example, it can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0050] Furthermore, the gap ratio of the mica layer 1 is 10 to 90% of the surface area of ​​the battery protection composite material, for example, it can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85% or 90%, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0051] Furthermore, the depth of each gap on the mica layer 1 is greater than 0.1 mm, for example, it can be 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, 0.70 mm, 0.80 mm, 0.90 mm, 1.0 mm, etc., but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0052] Furthermore, the thickness of the adhesive layer 2 is greater than 0.01 mm, for example, it can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0053] Furthermore, the thickness of the rubber surface treatment coating 3 is greater than 0.01 mm, for example, it can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, etc., but is not limited to the listed values, and other values ​​not listed within the range are also applicable.

[0054] Furthermore, the thickness of the ceramic silicone rubber layer 4 is greater than 0.5 mm, for example, it can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0055] Furthermore, the overall thickness of the battery protection composite material is 1.52 to 10.1 mm, for example, it can be 1.52 mm, 1.53 mm, 1.54 mm, 1.55 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 7.5 mm, 8.0 mm, 8.5 mm, 9.0 mm, 9.5 mm, 10.0 mm or 10.1 mm, etc., but is not limited to the listed values, and other values ​​not listed in the range are also applicable.

[0056] Furthermore, the adhesive layer 2 includes any one of an epoxy resin adhesive layer, a silicone resin adhesive layer or a double-sided adhesive layer.

[0057] Furthermore, the rubber surface treatment coating 3 includes a silane coupling agent or a primer.

[0058] Further, the mica layer 1 includes any one of a phlogopite layer, a muscovite layer or a fluorine mica layer.

[0059] Exemplarily, the preparation method of the battery protection composite material in the present invention includes:

[0060] The adhesive layer 2 is coated on the mica layer 1, and the ceramic silicone rubber layer 4 is coated with the rubber surface treatment coating 3 and then left to stand for 5 minutes. The glue is a thermosetting glue. At 120°C, the glue bonds the mica layer 1 and the ceramic silicone rubber layer 4 into an integral structure, thereby obtaining a high-temperature, high-pressure gas impact-resistant, high-temperature heat-insulating battery protection composite material having the mica layer 1, adhesive layer 2, rubber treatment coating and ceramic silicone rubber layer 4 arranged in sequence from top to bottom.

[0061] When in use, the fire-resistant, impact-insulating battery protection composite material can be cut into any size and placed between battery cells for protection. It can be widely used in gaps such as battery packs, battery covers, and between battery cells.

[0062] It should be noted that the battery protection composite material provided in the present invention can be used in other scenarios requiring high temperature and high pressure impact protection, such as fireproof layer, high temperature resistant layer and other occasions that meet the performance parameters of the material of the present invention. In addition, during use, the ceramic silicone rubber layer 4 can be used as the surface layer, that is, the layer close to the flame. The mica layer 1 is used as a heat insulation layer and a heat dissipation layer.

[0063] Example 1

[0064] This embodiment provides a battery protection composite material, wherein:

[0065] The battery protection composite material includes, from top to bottom, a mica layer 1 (phlogopite), an adhesive layer 2 (epoxy resin glue 3M DP-100), a rubber surface treatment coating 3 (Chemlok 608), and a ceramic silicone rubber layer 4 (BT-751 type) which are stacked in sequence.

[0066] Among them, the thickness of the mica layer 1 is 2.0mm, the gap rate of the mica layer 1 is 80%, the gap depth of the mica layer 1 is 0.5mm, the thickness of the adhesive layer 2 is 0.03mm, the thickness of the rubber surface treatment coating 3 is 0.03mm, the ceramic silicone rubber layer 4 is 1mm, and the total thickness is 3.06mm.

[0067] Example 2

[0068] This embodiment provides a battery protection composite material, wherein:

[0069] The battery protection composite material includes, from top to bottom, a mica layer 1 (muscovite mica), an adhesive layer 2 (silicone resin glue Kraft K704), a rubber surface treatment coating 3 (Kenda JD-803), and a ceramic silicone rubber layer 4 (SR1500UFR) which are stacked in sequence.

[0070] Among them, the thickness of the mica layer 1 is 2.0mm, the gap rate of the mica layer 1 is 30%, the gap depth of the mica layer 1 is 0.5mm, the thickness of the adhesive layer 2 is 0.03mm, the thickness of the rubber surface treatment coating 3 is 0.03mm, the ceramic silicone rubber layer 4 is 1mm, and the total thickness is 3.06mm.

[0071] Example 3

[0072] This embodiment provides a battery protection composite material, wherein:

[0073] The battery protection composite material includes, from top to bottom, a mica layer 1 (muscovite mica), an adhesive layer 2 (epoxy resin glue 3M DP2216), a rubber surface treatment coating 3 (Jinda JD-803), and a ceramic silicone rubber layer 4 (BT-751 type) which are stacked in sequence.

[0074] Among them, the thickness of the mica layer 1 is 3.0mm, the gap rate of the mica layer 1 is 50%, the gap depth of the mica layer 1 is 0.6mm, the thickness of the adhesive layer 2 is 0.08mm, the thickness of the rubber surface treatment coating 3 is 0.08mm, the ceramic silicone rubber layer 4 is 1.3mm, and the total thickness is 4.46mm.

[0075] Example 4

[0076] This embodiment provides a battery protection composite material, wherein:

[0077] The battery protection composite material includes, from top to bottom, a mica layer 1 (phlogopite), an adhesive layer 2 (silicone resin glue Kraft K704NB), a rubber surface treatment coating 3 (Chemlok 608), and a ceramic silicone rubber layer 4 (BT-751 type) which are stacked in sequence.

[0078] Among them, the thickness of the mica layer 1 is 1.2mm, the gap rate of the mica layer 1 is 70%, the gap depth of the mica layer 1 is 0.5mm, the thickness of the adhesive layer 2 is 0.04mm, the thickness of the rubber surface treatment coating 3 is 0.04mm, the ceramic silicone rubber layer 4 is 1.0mm, and the total thickness is 2.28mm.

[0079] Example 5

[0080] This embodiment provides a battery protection composite material, wherein:

[0081] The battery protection composite material includes, from top to bottom, a mica layer 1 (fluoromica), an adhesive layer 2 (double-sided tape 3M-9119-140), a rubber surface treatment coating 3 (Jinda JD-803), and a ceramic silicone rubber layer 4 (SR1500UFR) which are stacked in sequence.

[0082] Among them, the thickness of the mica layer 1 is 1.5mm, the gap rate of the mica layer 1 is 80%, the gap depth of the mica layer 1 is 0.8mm, the thickness of the adhesive layer 2 is 0.03mm, the thickness of the rubber surface treatment coating 3 is 0.03mm, the ceramic silicone rubber layer 4 is 1mm, and the total thickness is 2.56mm.

[0083] Example 6

[0084] This embodiment provides a battery protection composite material, wherein:

[0085] The battery protection composite material includes, from top to bottom, a mica layer 1 (fluoromica), an adhesive layer 2 (double-sided tape 3M 55236), a rubber surface treatment coating 3 (Chemlok 608), and a ceramic silicone rubber layer 4 (SR1500UFR) which are stacked in sequence.

[0086] Among them, the thickness of the mica layer 1 is 1.0mm, the gap rate of the mica layer 1 is 40%, the gap depth of the mica layer 1 is 0.9mm, the thickness of the adhesive layer 2 is 0.02mm, the thickness of the rubber surface treatment coating 3 is 0.02mm, the ceramic silicone rubber layer 4 is 0.5mm, and the total thickness is 1.54mm.

[0087] Example 7

[0088] This embodiment provides a battery protection composite material, which is different from Example 1 in that the thickness of the mica layer 1 is 0.7 mm, the thickness of the ceramic silicone rubber layer 4 is 0.3 mm, and the total thickness of the battery protection composite material is 1.06 mm. Other parameters and implementation methods are the same as those in Example 1.

[0089] Comparative Example 1

[0090] This comparative example provides a battery protection composite material, which is different from Example 1 in that the rubber surface treatment coating 3 is not used, and other parameters and implementation methods are the same as those of Example 1.

[0091] Comparative Example 2

[0092] This comparative example provides a battery protection composite material, which is different from Example 1 in that the thickness of the ceramic silicone rubber layer 4 is greater than the thickness of the mica layer 1, and the other parameters and implementation methods are the same as those of Example 1.

[0093] The battery protection composite materials prepared in Examples 1-7 and the battery protection composite materials prepared in Comparative Examples 1-2 were subjected to 30 minutes, 1300°C flame and 1.0 MPa pressure to test the performance of the battery protection composite materials, and the cold surface temperature was measured to test the thermal insulation performance, wherein the cold surface temperature refers to the actual temperature measured on the side or part with a lower temperature, and the cold surface generally refers to the side with a low temperature. The test results are shown in Table 1. The test method for electrical insulation performance refers to GB / T1408.1-2016.

[0094] Table 1 Performance test results of battery protection composite materials in embodiments and comparative examples

[0095]

[0096]

[0097] It can be seen from the data in Table 1 that the battery protection composite materials provided in Examples 1-3 have good fire resistance and resistance to high-pressure gas impact force compared to the battery protection composite materials provided in Examples 4-7. They will not be damaged or corroded during long-term use, have good electrical insulation, a surface voltage of 10 to 25 kV, good fire resistance, and can withstand high temperatures of up to 1300°C. They still have good electrical insulation properties at high temperatures in the range of 400 to 1300°C, and have good thermal insulation properties, with an isolation temperature of 300 to 1000°C.

[0098] The battery protection composite material provided in Example 1-3 is better in electrical insulation performance than the battery protection composite material provided in Comparative Example 1-2. This is because the mica board has excellent impact resistance, the ceramic silicone rubber layer has a certain elasticity under normal conditions, has a certain buffer, and can resist a certain impact force after being ceramicized at high temperature. When the temperature is above 1200°C, it can also show better impact resistance. This is because the ceramic silicone can resist part of the impact force after being ceramicized at 1200°C, and the overall protective body is still the mica board. Since new energy vehicles need to be lightweight, the overall material should not exceed 4.5mm, but the protection of this structure is not limited to new energy vehicles.

[0099] In summary, the battery protection composite material of the present invention can meet the requirements that the battery device can fully maintain the insulation performance of the electrical equipment in the event of a short circuit and fire, while preventing the impact force of high-pressure gas from damaging other battery cells, and at the same time isolating the damage to other battery cells caused by temperature.

[0100] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A battery protection composite material, characterized in that: The battery protection composite material comprises a mica layer, an adhesive layer, a rubber surface treatment coating and a ceramic silicone rubber layer stacked in sequence from top to bottom; The thickness of the mica layer is greater than or equal to the thickness of the ceramic silicone rubber layer.

2. The battery protection composite material according to claim 1, characterized in that: The thickness of the mica layer is greater than 1.0 mm, preferably 2 to 5 mm.

3. The battery protection composite material according to claim 1 or 2, characterized in that: The gap ratio of the mica layer is 10 to 90% of the surface area of ​​the battery protection composite material; Preferably, the depth of each gap on the mica layer is greater than 0.1 mm.

4. The battery protection composite material according to any one of claims 1 to 3, characterized in that: The thickness of the adhesive layer is greater than 0.01 mm, preferably 0.02 to 0.05 mm.

5. The battery protection composite material according to any one of claims 1 to 4, characterized in that: The thickness of the rubber surface treatment coating is greater than 0.01 mm, preferably 0.02 to 0.05 mm.

6. The battery protection composite material according to any one of claims 1 to 5, characterized in that: The thickness of the ceramic silicone rubber layer is greater than 0.5 mm, preferably 2 to 4 mm.

7. The battery protection composite material according to any one of claims 1 to 6, characterized in that: The overall thickness of the battery protection composite material is 1.52-10.1 mm.

8. The battery protection composite material according to any one of claims 1 to 7, characterized in that: The adhesive layer includes any one of an epoxy resin adhesive layer, a silicone resin adhesive layer or a double-sided adhesive layer.

9. The battery protection composite material according to any one of claims 1 to 8, characterized in that: The rubber surface treatment coating comprises a silane coupling agent or a primer.

10. The battery protection composite material according to any one of claims 1 to 9, characterized in that: The mica layer includes any one of a phlogopite layer, a muscovite layer or a fluorine mica layer.

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