Double-sided thermal activation heat insulation packaging film and simple and efficient aerogel heat insulation pad packaging structure

Abstract

The utility model discloses a double-sided thermal activation heat insulation packaging film and a simple efficient aerogel heat insulation pad packaging structure, the double-sided thermal activation heat insulation packaging film comprises a base layer, a pressure-sensitive adhesive layer, a flame retardant layer, a heat insulation layer and a thermal activation adhesive layer, one end face of the base layer is provided with the flame retardant layer, and the outer end face of the flame retardant layer is provided with the pressure-sensitive adhesive layer; a thermal insulation layer is arranged on the other end face of the base layer; a thermal activation adhesive layer is arranged on the outer end face of the thermal insulation layer; the pressure-sensitive adhesive layer and the thermal activation adhesive layer are respectively provided with a release layer which can be torn off. According to the simple and efficient aerogel heat insulation pad packaging structure, a double-face heat activation heat insulation packaging film is in a bag shape to package a heat insulation core material, and a heat activation glue layer of the double-face heat activation heat insulation packaging film makes contact with the heat insulation core material. The double-face heat activation heat insulation packaging film is manufactured into the packaging bag in advance, the buffering piece and the heat insulation core material are arranged, then vacuum hot pressing sealing is conducted, the packaging process efficiency of aerogel heat insulation cushion sealing is improved, heat insulation products are more stable, and the customization requirements of different clients are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal insulation packaging, and in particular relates to a double-sided heat-activated thermal insulation packaging film and a simple and efficient aerogel thermal insulation pad packaging structure. Background Art

[0002] The rapid development of the new energy battery industry is inseparable from the continuous development of thermal runaway management technology for battery PACKs. The current mainstream thermal runaway management of battery cells in the market mainly involves adding materials with good thermal insulation effects between battery cells, among which square battery cells mainly rely on aerogel thermal insulation materials. The thermal conductivity of aerogel thermal insulation materials is generally 0.015-0.024 W / (m·K), which has good thermal insulation effects and also has good fire resistance. The flame retardancy can reach UL94-V0 level, but in general, aerogel encapsulation film materials do not have good flame retardancy and thermal insulation effects, which will reduce the effect of the overall aerogel thermal insulation pad to a certain extent.

[0003] On the other hand, the current packaging process of aerogel insulation materials is relatively complicated. The overall packaging solution includes the heat transfer process - fabric process 1 - fabric process 2 - fabric process 3 - hot pressing process - cutting process - gluing process; the process requires a lot of manpower and is very inefficient. On the other hand, because there are many process steps and many process influencing factors, some product defects often occur. Utility Model Content

[0004] The utility model provides a double-sided heat-activated heat-insulating packaging film and a simple and efficient aerogel heat-insulating pad packaging structure, which are used to solve the deficiencies described in the above-mentioned prior art.

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

[0006] A double-sided heat-activated heat-insulating packaging film comprises a base layer, a pressure-sensitive adhesive layer, a flame-retardant layer, a heat-insulating layer and a heat-activated adhesive layer, wherein one end surface of the base layer is provided with a flame-retardant layer, and the outer end surface of the flame-retardant layer is provided with a pressure-sensitive adhesive layer; the other end surface of the base layer is provided with a heat-insulating layer, and the outer end surface of the heat-insulating layer is provided with a heat-activated adhesive layer; and tearable release layers are provided on both the pressure-sensitive adhesive layer and the heat-activated adhesive layer.

[0007] As a preferred solution of the utility model, the heat insulation layer is a metal heat insulation layer, which is usually an aluminum layer or a copper layer with a thickness between 0.1 μm and 1 μm. The function of the metal heat insulation layer is to block heat radiation and reduce heat transfer.

[0008] As a preferred embodiment of the utility model, the base layer is a plastic film such as a PBT film, a PET film, a PI film, a PC film, a PPO film or a PPM film, which has good tensile strength; the flame retardant layer is a resin ink flame retardant layer, which has strong adhesion and can be firmly attached to the base material. The flame retardant generally added is a halogen-free flame retardant, and common ones are inorganic flame retardants, phosphorus flame retardants, and nitrogen flame retardants. The flame retardant layer has excellent flame retardant effect, and the flame retardant grade of the double-sided heat-activated film reaches V-0 level.

[0009] The utility model also provides a simple and efficient aerogel thermal insulation pad packaging structure, including a thermal insulation core material and the above-mentioned double-sided heat-activated thermal insulation packaging film; the double-sided heat-activated thermal insulation packaging film encapsulates the thermal insulation core material, and the heat-activated adhesive layer of the double-sided heat-activated thermal insulation packaging film contacts the thermal insulation core material. The thermal insulation core material is encapsulated using the double-sided heat-activated thermal insulation packaging film. Before packaging, the double-sided heat-activated thermal insulation packaging film can be pre-packaged into a bag shape, and then hot-pressed and sealed after the thermal insulation core material is loaded. The edge sealing in advance simplifies the overall packaging process.

[0010] As a preferred solution of the utility model, the double-sided heat-activated heat-insulating packaging film is a packaging bag structure.

[0011] As a preferred solution of the utility model, the double-sided heat-activated insulating packaging film is an integrated film structure, and the double-sided heat-activated insulating packaging film is folded into a packaging bag to be sealed, and the packaging bag to be sealed has at least one insulating core material loading opening reserved, and the heat-activated adhesive layer at the insulating core material loading opening is hot-pressed after the insulating core material is loaded.

[0012] As a preferred solution of the utility model, the periphery of the packaging bag to be sealed is hot-pressed and bonded with only one insulating core material loading port, and the heat-activated adhesive layer at the insulating core material loading port is hot-pressed and bonded after the insulating core material is loaded.

[0013] As a preferred embodiment of the present invention, the double-sided heat-activated insulating packaging film is composed of two sheets, and the boundary joints of the two sheets of double-sided heat-activated insulating packaging film are heat-pressed at most three locations to form a packaging bag to be sealed, and the insulating core material is loaded into the packaging bag to be sealed from the insulating core material loading port reserved in the packaging bag to be sealed, and the heat-activated adhesive layer at the insulating core material loading port is heat-pressed.

[0014] As a preferred solution of the utility model, the thermal insulation core material is an aerogel thermal insulation core material, which has a low thermal conductivity, is fire-resistant at 1500℃-2000℃, and has a flame retardant performance reaching UL94-V0 level, and can effectively block the chain reaction caused by thermal runaway of the battery cell.

[0015] As a preferred solution of the utility model, a buffer is provided around the thermal insulation core material. The buffer may be a buffer frame or a buffer strip, which is placed around the thermal insulation core material. The buffer has a certain compression stress rebound and good flame retardant properties, and is used to absorb and release the expansion force generated during the charging and discharging process of the battery cell, thereby protecting the battery cell.

[0016] The utility model uses a double-sided heat-activated thermal insulation packaging film with multiple functional layers, and the heat-activated adhesive layer becomes sticky after being catalyzed at an appropriate temperature, and can remain non-sticky at room temperature. The present application can pre-form the double-sided heat-activated thermal insulation packaging film into a packaging bag structure, and then vacuum hot press and seal it after loading the buffer and the thermal insulation core material, which greatly improves the efficiency of the aerogel thermal insulation pad packaging process, making the thermal insulation product more stable and able to meet the customized needs of different customers. In addition, the heat-activated adhesive layer used in the present application belongs to a heat-activated adhesive, which is not sticky at room temperature, can be firmly attached together within a temperature range of 90°C-150°C, a time range of 10s-30s, and a pressure range of 2-5Mpa, and can have a certain degree of adhesion with the buffer and the aerogel thermal insulation core material, so that the overall structure has a certain stability after vacuum hot pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of the double-sided heat-activated thermal insulation packaging film of the utility model.

[0019] Figure 2 It is a packaging bag structure with three perimeters that are heat-pressed with two-piece double-sided heat-activated thermal insulation packaging film.

[0020] Figure 3 This is a schematic diagram of the packaging structure of the aerogel thermal insulation pad of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example:

[0023] A double-sided heat-activated thermal insulation packaging film, such as Figure 1 As shown, it includes a base layer 1, a pressure-sensitive adhesive layer 2, a flame retardant layer 3, a heat-insulating layer 4 and a heat-activated adhesive layer 5. The base layer 1 is a plastic film such as a PBT film, a PET film, a PI film, a PC film, a PPO film or a PPM film, which has good tensile strength; the flame retardant layer is a resin ink flame retardant layer, which has strong adhesion and can be firmly attached to the base material. The flame retardant generally added is a halogen-free flame retardant, and the common ones are inorganic flame retardants, phosphorus flame retardants, and nitrogen flame retardants. The flame retardant layer has excellent flame retardant effect, and the flame retardant grade of the double-sided heat-activated film reaches V-0 level.

[0024] The heat insulation layer is a metal heat insulation layer, usually an aluminum layer or a copper layer, with a thickness between 0.1 μm and 1 μm. The function of the metal heat insulation layer is to block heat radiation and reduce heat transfer.

[0025] The heat-activated adhesive layer 5 is a heat-activated adhesive, which is not sticky at room temperature, but can be firmly bonded together within a temperature range of 90° C. to 150° C., a time range of 10s to 30s, and a pressure range of 2 to 5Mpa.

[0026] A flame retardant layer 3 is provided on one end face of the base layer 1, and a pressure-sensitive adhesive layer 2 is provided on the outer end face of the flame retardant layer 3; a heat insulation layer 4 is provided on the other end face of the base layer 1, and a heat-activated adhesive layer 5 is provided on the outer end face of the heat insulation layer 4; and a tearable release layer 6 is provided on both the pressure-sensitive adhesive layer 2 and the heat-activated adhesive layer 5.

[0027] After obtaining the double-sided heat-activated insulation packaging film, a single piece of double-sided heat-activated insulation packaging film can be used to make a packaging bag, or two pieces of double-sided heat-activated insulation packaging film can be used to make a packaging bag. This application takes two pieces of double-sided heat-activated insulation packaging film as an example to illustrate the packaging bag. Figure 2 shown.

[0028] The boundary joints of two double-sided heat-activated insulation packaging films are combined by heat-pressing at most three places to form a packaging bag to be sealed. The insulation core material 7 is loaded into the packaging bag to be sealed from the insulation core material loading port reserved in the packaging bag to be sealed. The heat-activated adhesive layer at the insulation core material loading port is vacuum hot-pressed. The heat-activated adhesive layer 5 of the double-sided heat-activated insulation packaging film is in contact with the insulation core material, and a buffer member 8 is provided around the insulation core material to obtain a simple and efficient aerogel insulation pad packaging structure. The buffer member can be a buffer frame or a buffer strip. The buffer strip is placed around the insulation core material. The buffer member has a certain compression stress rebound and good flame retardant properties. It is used to absorb and release the expansion force generated during the charging and discharging process of the battery cell to protect the battery cell. This embodiment is demonstrated using a buffer frame as an example.

[0029] The thermal insulation core material used is aerogel thermal insulation core material, which has a low thermal conductivity, is fire-resistant at 1500℃-2000℃, and has a flame retardant performance reaching UL94-V0 level, which can effectively block the chain reaction caused by thermal runaway of the battery cell.

[0030] Of course, the packaging bag may also use a one-piece double-sided heat-activated insulation packaging film, which is folded into a packaging bag to be sealed, and the packaging bag to be sealed has at least one insulation core material loading port reserved, and the heat-activated adhesive layer at the insulation core material loading port is heat-pressed after the insulation core material is loaded. Preferably, the periphery of the packaging bag to be sealed is heat-pressed and bonded with only one insulation core material loading port, and the heat-activated adhesive layer at the insulation core material loading port is heat-pressed after the insulation core material is loaded.

[0031] In the description of this specification, the description of reference terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-sided heat-activated thermal insulation packaging film, characterized in that: The invention comprises a base layer (1), a pressure-sensitive adhesive layer (2), a flame-retardant layer (3), a heat-insulating layer (4) and a heat-activated adhesive layer (5); one end surface of the base layer (1) is provided with a flame-retardant layer (3), and the outer end surface of the flame-retardant layer (3) is provided with a pressure-sensitive adhesive layer (2); the other end surface of the base layer (1) is provided with a heat-insulating layer (4), and the outer end surface of the heat-insulating layer (4) is provided with a heat-activated adhesive layer (5); and a tearable release layer (6) is provided on both the pressure-sensitive adhesive layer (2) and the heat-activated adhesive layer (5).

2. The double-sided heat-activated thermal insulation packaging film according to claim 1, characterized in that: The heat insulation layer is a metal heat insulation layer.

3. The double-sided heat-activated thermal insulation packaging film according to claim 1 or 2, characterized in that: The base layer (1) is a PBT film, a PET film, a PI film, a PC film, a PPO film or a PPM film; and the flame retardant layer is a resin ink flame retardant layer.

4. A simple and efficient aerogel thermal insulation pad packaging structure, characterized in that: It comprises a heat-insulating core material (7) and a double-sided heat-activated heat-insulating packaging film as claimed in any one of claims 1 to 3; The double-sided heat-activated heat-insulating packaging film encapsulates the heat-insulating core material, and the heat-activated adhesive layer (5) of the double-sided heat-activated heat-insulating packaging film is in contact with the heat-insulating core material.

5. The simple and efficient aerogel thermal insulation pad packaging structure according to claim 4 is characterized in that: The double-sided heat-activated heat-insulating packaging film forms a packaging bag structure.

6. The simple and efficient aerogel thermal insulation pad packaging structure according to claim 5 is characterized in that: The double-sided heat-activated insulation packaging film is an integrated film structure, and the double-sided heat-activated insulation packaging film is folded into a packaging bag to be sealed, and the packaging bag to be sealed has at least one insulation core material loading opening reserved, and the heat-activated adhesive layer at the insulation core material loading opening is heat-pressed after the insulation core material is loaded.

7. The simple and efficient aerogel thermal insulation pad packaging structure according to claim 6 is characterized in that: The periphery of the packaging bag to be sealed is hot-pressed and bonded to reserve only one heat-insulating core material loading opening, and after the heat-insulating core material is loaded, the heat-activated adhesive layer at the heat-insulating core material loading opening is heat-pressed and bonded.

8. The simple and efficient aerogel thermal insulation pad packaging structure according to claim 5 is characterized in that: The double-sided heat-activated insulation packaging film is composed of two sheets, and the boundary joints of the two sheets of double-sided heat-activated insulation packaging film are heat-pressed at most three places to form a packaging bag to be sealed, and the insulation core material is loaded into the packaging bag to be sealed from the insulation core material loading port reserved in the packaging bag to be sealed, and the heat-activated adhesive layer at the insulation core material loading port is heat-pressed.

9. The simple and efficient aerogel thermal insulation pad packaging structure according to any one of claims 4 to 8, characterized in that: The thermal insulation core material is an aerogel thermal insulation core material.

10. The simple and efficient aerogel thermal insulation pad packaging structure according to any one of claims 4 to 8, characterized in that: A buffer piece is arranged around the periphery of the heat insulating core material.

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