Heat insulation pad with packaging film internally provided with fireproof layer

Abstract

The heat insulation pad comprises a heat insulation core material, a buffer frame, an upper packaging film and a lower packaging film, the heat insulation core material is arranged at a core material placing position of the buffer frame, and the fireproof layer is arranged on the working end face of the buffer frame; the heat insulation core material, the buffer frame and the fireproof layer are packaged together through the upper packaging film and the lower packaging film. And the buffer frame is a low-flame-retardant rubber frame or a non-flame-retardant rubber frame. The flame retardant added into the silicone rubber is reduced or even not added, so that the elasticity and the fireproof function of the silicone rubber are transferred to the fireproof layer, and when the battery cell is subjected to thermal runaway, the fireproof layer can be self-flame-retardant, so that the whole heat insulation pad can effectively inhibit or diffuse, isolate air and conduct heat.

Description

Technical Field

[0001] The utility model belongs to the field of power battery safety, and particularly relates to a heat insulation pad with a fireproof layer arranged in a packaging film. Background Art

[0002] New energy heat insulation pads are mainly used for thermal protection between power lithium battery cells, can prevent thermal runaway of the cells, and greatly improve the driving safety of new energy vehicles.

[0003] The structure of the conventional silicone rubber frame heat insulation pad is mainly double-sided adhesive - PET film - silicone rubber frame - aerogel core material - PET film - double-sided adhesive. In order to ensure the flame retardant effect of the heat insulation pad, the silicone rubber is required to have excellent flame retardant performance. When a flame retardant is added to the silicone rubber to improve its flame retardant performance, the elasticity of the silicone rubber will decrease significantly. The higher the flame retardant grade, the worse its elastic function, which may affect the sealing performance and durability of the heat insulation pad. Summary of the Utility Model

[0004] Aiming at the problem of poor elasticity of the silicone rubber of the existing heat insulation pad, the utility model provides a heat insulation pad with a fireproof layer arranged in a packaging film, which uses a low-flame-retardant or non-flame-retardant rubber frame and sets a fireproof layer on the rubber frame to cooperate to achieve the purpose of elasticity and fireproofing and flame retardance.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A heat insulation pad with a fireproof layer arranged in a packaging film, including a heat insulation core material, a buffer frame, an upper packaging film and a lower packaging film. The heat insulation core material is arranged at the core material placement position of the buffer frame, and a fireproof layer is arranged on the working end face of the buffer frame; the upper packaging film and the lower packaging film encapsulate the heat insulation core material, the buffer frame and the fireproof layer together; and the buffer frame is a low-flame-retardant rubber frame or a non-flame-retardant rubber frame. The flame retardant of the normal silicone rubber frame is halogen-free, such as aluminum hydroxide, and the addition amount is 20 - 40%. The addition amount of the low-flame-retardant silicone rubber frame can be less than 10%; when the addition of the flame retardant in the silicone rubber is reduced or even not added, the elasticity of the silicone rubber is ensured, and the fireproof function is transferred to the fireproof layer. When the cell has a thermal runaway, the fireproof layers on the two working end faces of the buffer frame can self-extinguish, so that the whole heat insulation pad can effectively inhibit the spread of fire, isolate air and heat conduction.

[0007] As a preferred scheme of the utility model, the fireproof layer is a fireproof coating or a fireproof film. The fireproof coating is sprayed with epoxy intumescent fireproof paint, or a fireproof film can also be pasted.

[0008] As a preferred scheme of the utility model, the thickness of the fireproof layer is 0.3 - 1 mm.

[0009] As a preferred embodiment of the present utility model, adhesive layers are provided on the outer end surfaces of the upper encapsulation film and the lower encapsulation film, and double-sided tape can be used. The double-sided tape is for pasting between the battery cells.

[0010] As a preferred embodiment of the present utility model, the fireproof layer covers the working end surfaces of the buffer frame and the heat insulation core material.

[0011] As a preferred embodiment of the present utility model, the heat insulation core material is an aerogel core material, including but not limited to "ceramic aerogel felt, pre-oxidized fiber aerogel felt, glass fiber aerogel felt".

[0012] As a preferred embodiment of the present utility model, the upper encapsulation film and / or the lower encapsulation film is a PET film, a PI film or a PU film. The upper and lower encapsulation films can be of the same film material or different film materials, as long as they can perform encapsulation. Of course, other encapsulation materials can also be used, not limited to film materials.

[0013] The present utility model replaces the flame-retardant rubber frame of the original heat insulation pad with a low-flame-retardant or non-flame-retardant rubber frame, and a fireproof layer is provided on the rubber frame. The two are combined to jointly achieve the functions of elasticity and fire protection, providing the tensile resilience performance and other physical properties of the overall heat insulation pad, while also meeting the requirements for the flame retardancy of the heat insulation pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of Embodiment 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0017] Embodiment 1:

[0018] A heat insulation pad with a fireproof layer provided inside an encapsulation film, as Figure 1As shown in the figure, it includes a heat-insulating core material 1, a buffer frame 2, a fireproof layer 3, an upper encapsulation film 4 and a lower encapsulation film 5. The heat-insulating core material is an aerogel core material, including but not limited to ceramic aerogel felt, pre-oxidized fiber aerogel felt, and fiberglass aerogel felt, which is specifically selected according to needs.

[0019] The upper encapsulation film 4 and the lower encapsulation film 5 are PET films, PI films or PU films. The upper and lower encapsulation films can be of the same film material or different film materials, as long as they can be encapsulated. Of course, they can also be other encapsulation materials, not limited to film materials.

[0020] The heat-insulating core material 1 is arranged at the core material placement position of the buffer frame 2, and fireproof layers 3 are arranged on the two working end faces of the buffer frame. The buffer frame is a low-flame-retardant rubber frame or a non-flame-retardant rubber frame. The flame retardant of a normal silicone rubber frame is halogen-free, such as aluminum hydroxide, and the addition amount is 20-40%. While the addition amount of the flame retardant of the low-flame-retardant silicone rubber frame can be less than 10%, or even not added, ensuring the elasticity of the silicone rubber, and the fireproof function is transferred to the fireproof layer.

[0021] The upper encapsulation film 4 and the lower encapsulation film 5 encapsulate the heat-insulating core material 1, the buffer frame 2 and the fireproof layer 3 together, and adhesive layers 6 are provided on the outer end faces of the upper encapsulation film and the lower encapsulation film, and double-sided tape is used for the adhesive layers.

[0022] For this embodiment, the fireproof layer used can be a fireproof coating or a fireproof film. The fireproof coating is sprayed with epoxy intumescent fireproof paint, or a fireproof film can be pasted, and the thickness is 0.3-1 mm. When the battery cell undergoes thermal runaway, the fireproof layer can self-extinguish, enabling the overall heat-insulating pad to effectively inhibit the spread of fire, isolate air and heat conduction.

[0023] Embodiment 2:

[0024] A heat-insulating pad with a fireproof layer arranged inside the encapsulation film, where the fireproof layer is a fireproof film covering the working end faces of the buffer frame and the heat-insulating core material, and the thickness is also 0.3-1 mm. The rest are the same as those in Embodiment 1.

[0025] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0026] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A heat insulation pad with a fireproof layer inside the encapsulation film, comprising a heat insulation core material (1), a buffer frame (2), an upper encapsulation film (4) and a lower encapsulation film (5), characterized in that: The heat-insulating core material (1) is arranged at the core material placement position of the buffer frame (2), and a fireproof layer (3) is arranged on the working end face of the buffer frame; the upper encapsulation film (4) and the lower encapsulation film (5) encapsulate the heat-insulating core material (1), the buffer frame (2), and the fireproof layer (3) together; and the buffer frame is a low-flame-retardant rubber frame or a non-flame-retardant rubber frame.

2. The heat insulation pad with a fireproof layer arranged inside the encapsulation film according to claim 1, wherein: The fireproof layer is a fireproof coating or a fireproof film.

3. The heat insulation pad with a fireproof layer provided inside the encapsulation film according to claim 2, characterized in that: The thickness of the fireproof layer is 0.3 - 1 mm.

4. The heat insulation pad with a fireproof layer arranged inside the encapsulation film according to claim 2 or 3, characterized in that: Adhesive layers (6) are arranged on the outer end faces of both the upper encapsulation film and the lower encapsulation film.

5. The heat insulation pad with a fireproof layer arranged inside the encapsulation film according to claim 2 or 3, characterized in that: The fireproof layer covers the working end face of the buffer frame and the working end face of the heat-insulating core material.

6. The heat insulation pad with a fireproof layer arranged inside the encapsulation film according to claim 1, wherein: The heat-insulating core material is an aerogel core material.

7. The heat insulation pad with a fireproof layer arranged inside the encapsulation film according to claim 1, wherein: The upper encapsulation film (4) and / or the lower encapsulation film (5) is a PET film, a PI film, or a PU film.

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