Elastic insulating and heat-insulating composite board

Abstract

The utility model provides an elastic insulation and heat insulation composite board. The elastic insulation and heat insulation composite board comprises a first foam layer, a first bonding layer, a vacuum nanometer heat insulation board layer, a second bonding layer and a second foam layer which are sequentially arranged in a stacked mode. The elastic insulation and heat insulation composite board has excellent compression resilience, heat insulation, high temperature resistance and high temperature insulation performance, and can effectively avoid the problem of permanent deformation caused by long-time extrusion in the use process; and the preparation method is simple in process flow and low in cost, and has a good industrial application prospect.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery protection and relates to an elastic insulating and heat-insulating composite board. Background Art

[0002] In recent years, the energy and number of battery cells in new energy vehicles have increased, and the thermal insulation materials between the single cells play a key role in delaying or blocking the spread of thermal runaway of the single cells to the entire battery system. The elastic materials between the single cells play a key role in alleviating mechanical collisions and stabilizing the cells. Therefore, the elastic thermal insulation materials must have the following properties: flame retardant (reaching V0 level); aging resistance, stable chemical properties; good compression resilience; low thermal conductivity, anti-vibration, electrical insulation; light weight, low price, thin thickness, etc.

[0003] Commonly used thermal insulation materials include foam plastics, glass wool, high-silica wool, aerogels, nano-insulation boards, etc. Among them, the chemical stability and aging performance of foam plastics are greatly affected by the material and the environment, and they cannot withstand high temperatures above 800°C during battery thermal runaway; super wool, glass wool, high-silica wool and aerogel materials are easily punctured and cannot withstand the flames and particle impacts generated by battery thermal runaway.

[0004] CN207697181U discloses a heat-insulating fireproof material for new energy vehicle power batteries. The fireproof material can be a flat layered structure of any shape after being unfolded in a plane. It is composed of five layers: glass fiber cloth, glue layer, nano aerogel felt layer, glue layer, and glass fiber cloth. It is at least composed of a surface layer, a glue layer, and an intermediate layer. Among them, the glass fiber cloth is on the upper and lower surfaces, forming the surface layer; the glue layer is applied to the inner surface of the glass fiber cloth and is in direct contact with the nano aerogel felt layer of the intermediate layer, and the edge of the fireproof material is sealed by bonding or sewing. Although this material has excellent heat-insulating and fire-proof properties, it does not take into account the rebound performance under extrusion between battery cells.

[0005] CN209675463U discloses an aerogel thermal insulation sheet, comprising an aerogel layer, and protective film layers arranged on the upper and lower surfaces of the aerogel layer, wherein the protective film layers are bonded to the upper and lower surfaces of the aerogel layer by hot melt adhesive, and the protective film layers on the upper and lower surfaces of the aerogel layer both extend toward the outer side of the edge of the aerogel layer. The aerogel thermal insulation sheet also includes a frame structure, which surrounds the aerogel layer, and the portion of the protective film layer extending outward from the aerogel layer is bonded to the upper and lower surfaces of the frame structure by hot melt adhesive to prevent the aerogel layer from being severely deformed by the swelling and extrusion of the automobile battery, but the insulation performance at high temperature is not considered.

[0006] Therefore, designing a composite material that has excellent thermal insulation and high-temperature insulation properties and can effectively avoid permanent deformation caused by long-term extrusion during use has become an urgent problem that technical personnel in this field need to solve. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an elastic insulating and heat-insulating composite board with excellent compression rebound, heat insulation, high temperature resistance and high-temperature insulation properties, which can effectively avoid permanent deformation caused by long-term extrusion during use; and its preparation process is simple, the cost is low, and it has good prospects for industrial application.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides an elastic insulating heat-insulating composite board, which comprises a first foam layer, a first bonding layer, a vacuum nano thermal insulation board layer, a second bonding layer and a second foam layer which are stacked in sequence.

[0010] In the utility model, the elastic insulating and heat-insulating composite board is a combined layer structure.

[0011] The utility model provides a composite board which is stacked in sequence by a first foam layer, a first bonding layer, a vacuum nano thermal insulation board layer, a second bonding layer and a second foam layer. The obtained composite board has excellent compression rebound, thermal insulation, high temperature resistance and high temperature insulation performance, and can also effectively avoid the problem of permanent deformation caused by long-term squeezing during use.

[0012] In the present invention, the vacuum nano thermal insulation board layer is a composite insulating material with good thermal stability, low thermal conductivity, and good electrical insulation performance at both room temperature and high temperature; the first foam layer and the second foam layer both have good insulation performance, and have good compression resilience performance at both room temperature and use temperature. Therefore, using the foam layer as the encapsulation layer of the vacuum nano thermal insulation board layer can not only improve the insulation performance of the composite board, but also make the composite board have excellent resilience performance.

[0013] As a preferred technical solution of the present invention, the thickness of the elastic insulating composite board is 2 to 15 mm, for example, it can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm or 14.5 mm, etc., but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0014] As a preferred technical solution of the present invention, the thickness of the first foam layer is 0.5-5 mm, for example, it can be 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or 4.5 mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] As a preferred technical solution of the present invention, the thickness of the vacuum nano insulation board layer is 1 to 5 mm, for example, it can be 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or 4.5 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0016] As a preferred technical solution of the present invention, the thickness of the second foam layer is 0.5-5 mm, for example, it can be 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or 4.5 mm, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0017] As a preferred technical solution of the present invention, the thickness ratio of the first foam layer, the vacuum nano insulation board layer and the second foam layer is (0.5-2):(1-2.5):(0.5-2), for example, it can be 0.5:1:0.5, 0.5:1:1, 1:1:1, 1.5:1:1.5, 1.5:2:1.5 or 2:2.5:2, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] As a preferred technical solution of the present invention, the thickness of the first adhesive layer and the second adhesive layer are both 0.05-0.1 mm, for example, 0.055 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.095 mm, etc., but are not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0019] As a preferred technical solution of the present utility model, the first foam layer and the second foam layer both include a silicone foam layer or an ester foam layer.

[0020] In the present invention, silicon foam or ester foam is selected as the material of the first foam layer and the second foam layer, because silicon foam and ester foam products have good high temperature resistance, creep resistance, excellent elasticity, and good compression rebound performance at both normal temperature and high temperature. Therefore, using silicon foam and ester foam products in the encapsulation layer of the vacuum nano insulation board layer can not only improve the insulation performance of the insulation material, but also improve the compression rebound performance of the material.

[0021] In the present invention, the density of the first foam layer and the second foam layer is 400-500kg / m 3 , for example, it can be 410kg / m 3 , 420kg / m 3 , 430kg / m 3 , 450kg / m 3 , 460kg / m 3 or 480kg / m 3 The above range is not limited to the listed values, and other values ​​not listed within the above range are also applicable.

[0022] In the utility model, the compression strength of the first foam layer and the second foam layer at a compression ratio of 20% are both 50-210 kPa, for example, it can be 60 kPa, 80 kPa, 100 kPa, 120 kPa, 140 kPa, 150 kPa, 160 kPa, 180 kPa or 200 kPa, etc., but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0023] As a preferred technical solution of the utility model, the vacuum nano thermal insulation board layer includes a silicon dioxide vacuum nano thermal insulation board layer.

[0024] Preferably, the packaging film of the vacuum nano thermal insulation board layer comprises a thermoplastic film.

[0025] In the present invention, there is no specific limitation on the material used for the thermoplastic film, as long as it can play a packaging role, and those skilled in the art can make a specific selection according to actual conditions.

[0026] As a preferred technical solution of the present utility model, the first adhesive layer and the second adhesive layer both include any one of a silicone pressure-sensitive adhesive layer, a hot-melt adhesive layer or a double-sided adhesive layer.

[0027] In the utility model, after the surfaces of the first foam layer and the second foam layer are coated with silicone pressure-sensitive adhesive, hot-melt adhesive or double-sided adhesive, they are then bonded to the vacuum nano thermal insulation board layer. When silicone pressure-sensitive adhesive or hot-melt adhesive is used, it is necessary to bond after being treated at a temperature of 90°C; when double-sided adhesive is used, it can be bonded at room temperature. In addition, a primer needs to be coated on the surfaces of the first foam layer and the second foam layer before bonding.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] (1) The elastic insulating and heat-insulating composite board provided by the utility model has excellent compression rebound, heat insulation, high temperature resistance and high temperature insulation properties, and can effectively avoid the problem of permanent deformation caused by long-term extrusion during use; and its preparation process is simple, the cost is low, and it has good industrial application prospects;

[0030] (2) The elastic insulating composite board provided by the utility model has a resistivity of 1×10 11 Ω·cm or more, the electrical strength is maintained at more than 2kV / mm, and the compression rebound stress retention rate is more than 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of the elastic insulating and heat-insulating composite panel provided in Example 1;

[0032] Among them, 1 is the first foam layer, 2 is the first adhesive layer, 3 is the vacuum nano thermal insulation board layer, 4 is the second adhesive layer, and 5 is the second foam layer. DETAILED DESCRIPTION

[0033] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply 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 utility model. 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 utility model, unless otherwise specified, "multiple" means two or more.

[0034] 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0035] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0036] Example 1

[0037] This embodiment provides an elastic insulating and heat-insulating composite board (its structural schematic diagram is shown in FIG. Figure 1 As shown), the elastic insulating composite board includes a first foam layer 1, a first adhesive layer 2, a vacuum nano insulation board layer 3, a second adhesive layer 4 and a second foam layer 5 which are stacked in sequence.

[0038] The elastic insulating and heat-insulating composite board obtained in this embodiment has excellent compression rebound, heat insulation, high temperature resistance and high temperature insulation properties, and can also effectively avoid the problem of permanent deformation caused by long-term squeezing during use; it can be used in the field of new energy electric vehicle battery protection.

[0039] Example 2

[0040] This embodiment provides an elastic insulating and heat-insulating composite board, which includes a first foam layer, a first adhesive layer, a vacuum nano thermal insulation board layer, a second adhesive layer and a second foam layer stacked in sequence;

[0041] The first foam layer and the second foam layer are both silicone foam layers with a thickness of 1.5 mm;

[0042] The vacuum nano thermal insulation board layer is a silicon dioxide vacuum nano thermal insulation board layer with a thickness of 2 mm;

[0043] The first adhesive layer and the second adhesive layer are both PET-based pressure-sensitive double-sided adhesive layers with a thickness of 0.05 mm.

[0044] The elastic insulating composite board obtained in this embodiment has a slow heating rate at the early stage under the condition of 1000°C fire, and the cold surface temperature is between 120 and 150°C; the breakdown voltage at 200°C is 14.86KV, and the resistivity is 3.50×10 14 Ω·cm, and the compressive strength at 20% compression ratio is 151 kPa.

[0045] Example 3

[0046] This embodiment provides an elastic insulating composite board, except that the first foam layer and the second foam layer are adjusted to ester foam layers with a thickness of 1.5 mm; other conditions are the same as those in Example 2.

[0047] The elastic insulating composite board obtained in this embodiment has a slow heating rate at the early stage under the condition of 1000°C fire, and the cold surface temperature is between 130 and 160°C; the breakdown voltage at 200°C is 17.75KV, and the resistivity is 4.02×10 11 Ω·cm, and the compressive strength at 20% compression ratio is 156 kPa.

[0048] Example 4

[0049] This embodiment provides an elastic insulating composite board, except that the thickness of the vacuum nano-insulation board layer is adjusted to 1 mm; other conditions are the same as those in Embodiment 2.

[0050] The elastic insulating and heat-insulating composite board obtained in this embodiment has a slow heating rate in the early stage under the condition of 1000°C fire, and the cold surface temperature is between 170 and 200°C; the breakdown voltage at 200°C is 18.76KV, and the resistivity is 3.12×10 11 Ω·cm, and the compressive strength at 20% compression ratio is 100 kPa.

[0051] Example 5

[0052] This embodiment provides an elastic insulating and heat-insulating composite board, which includes a first foam layer, a first adhesive layer, a vacuum nano thermal insulation board layer, a second adhesive layer and a second foam layer stacked in sequence;

[0053] The first foam layer and the second foam layer are both ester foam layers with a thickness of 1.5 mm;

[0054] The vacuum nano thermal insulation board layer is a silicon dioxide vacuum nano thermal insulation board layer with a thickness of 1 mm;

[0055] The first adhesive layer and the second adhesive layer are both PET-based pressure-sensitive double-sided adhesive layers with a thickness of 0.05 mm.

[0056] The elastic insulating and heat-insulating composite board obtained in this embodiment has a slow heating rate in the early stage under the condition of 1000°C fire, and the cold surface temperature is between 180 and 210°C; the breakdown voltage at 200°C is 18.76KV, and the resistivity is 6.12×10 11 Ω·cm, and the compressive strength at 20% compression ratio is 110 kPa.

[0057] Example 6

[0058] This embodiment provides an elastic insulating composite board, except that the thickness of the first foam layer and the second foam layer are both adjusted to 0.5 mm; other conditions are the same as those of Embodiment 5.

[0059] The elastic insulating composite board obtained in this embodiment has a slow heating rate at the early stage under the condition of 1000°C fire, and the cold surface temperature is between 210 and 240°C; the breakdown voltage at 200°C is 15.76KV, and the resistivity is 4.02×10 11 Ω·cm, and the compressive strength at 20% compression ratio is 210 kPa.

[0060] Comparative Example 1

[0061] This comparative example provides an insulating and heat-insulating composite board, except that the first foam layer and the second foam layer are adjusted to glass fiber cloth layers with a thickness of 1.5 mm; other conditions are the same as those in Example 2.

[0062] Although the elastic insulating and heat-insulating composite board obtained in this comparative example still has excellent thermal insulation and fireproof properties, it does not have rebound performance and is not recommended for use in the field of new energy electric vehicle battery protection.

[0063] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. An elastic insulating composite panel, characterized in that: The elastic insulating composite board comprises a first foam layer, a first bonding layer, a vacuum nano thermal insulation board layer, a second bonding layer and a second foam layer which are stacked in sequence.

2. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness of the elastic insulating and heat-insulating composite board is 2 to 15 mm.

3. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness of the first foam layer is 0.5-5 mm.

4. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness of the vacuum nano thermal insulation board layer is 1 to 5 mm.

5. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness of the second foam layer is 0.5-5 mm.

6. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness ratio of the first foam layer, the vacuum nano thermal insulation board layer and the second foam layer is (0.5-2):(1-2.5):(0.5-2).

7. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The thickness of the first adhesive layer and the second adhesive layer are both 0.05-0.1 mm.

8. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The first foam layer and the second foam layer both include a silicone foam layer or an ester foam layer.

9. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The vacuum nano thermal insulation board layer comprises a silicon dioxide vacuum nano thermal insulation board layer; The packaging film of the vacuum nano thermal insulation board layer comprises a thermoplastic film.

10. The elastic insulating and heat-insulating composite panel according to claim 1, characterized in that: The first adhesive layer and the second adhesive layer both include any one of an organic silicone pressure-sensitive adhesive layer, a hot-melt adhesive layer or a double-sided adhesive layer.

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