A kind of heat-dissipating electric heating film

Abstract

The utility model belongs to the field of electric heating films, and in particular, relates to a heat-distributing electric heating film. The electric heating film provided by the utility model comprises a first insulating protective film layer, a resistance layer, a second insulating protective film layer, a mesh heat-conducting layer and a third insulating protective film layer which are stacked in sequence; the resistance layer is composed of heating circuits distributed at a certain interval, and the heating circuits are designed in series or in parallel; the two ends of the heating circuits are respectively used as the positive and negative electrodes of the electric heating film for connecting to an external power supply. The electric heating film provided by the utility model has good heating uniformity.

Description

Technical Field

[0001] The utility model belongs to the field of electric heating films, in particular to a heat-averaging electric heating film. Background Art

[0002] In recent years, with the continuous expansion of the application scope of electric heating films, the requirements for the temperature uniformity of electric heating films have become increasingly higher.

[0003] Common electric heating films on the market include metal electric heating films and non-metallic electric heating films. Non-metallic electric heating films usually include graphene electric heating films, graphite paper electric heating films, carbon fiber electric heating films, carbon crystal electric heating films, etc. In order to match the requirements of resistance, the heating circuits of some electric heating films are usually designed at a certain interval. However, since there are gaps between the heating lines of this type of electric heating film, it is difficult for the heat to completely diffuse to the gap part when it is powered on, resulting in heat accumulation in the heating line part. To achieve the same power density, the temperature of the line part is significantly higher than that of the gap part, and the temperature uniformity is poor, which limits the application of the heating film. Based on the above problems, it is necessary to explore and develop a heat-averaging heating film to reduce the temperature difference between the heating lines and the gap part of the heating film and achieve uniform heating. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a heat-uniform electric heating film, which has good heating uniformity.

[0005] The utility model provides a heat-equalizing electric heating film, comprising a first insulating protective film layer, a resistance layer, a second insulating protective film layer, a heat-conducting layer and a third insulating protective film layer which are stacked in sequence;

[0006] The resistance layer is composed of heating circuits distributed at certain intervals, and the heating circuits are designed to be connected in series or in parallel; the two ends of the heating circuit serve as the positive electrode and the negative electrode of the electric heating film respectively for connecting to an external power supply.

[0007] Preferably, the heating circuit is a single-layer structure or a multi-layer composite structure, and the material of each layer is independently selected as a metal film, graphite thermal conductive paper, graphene film, carbon fiber film or carbon crystal film.

[0008] Preferably, the metal film is aluminum foil, aluminum-plated foil, copper foil, gold foil, silver foil, black foil, nickel-chromium foil, aluminum-nickel-iron foil, tin-aluminum foil, iron-chromium-aluminum foil or hand-torn steel foil.

[0009] Preferably, the graphite thermally conductive paper is PI sintered graphite thermally conductive paper, graphene thermally conductive paper or natural graphite thermally conductive paper.

[0010] Preferably, the resistance layer is composed of heating circuits distributed at certain intervals in an S-shape, U-shape, circular, elliptical or irregular shape.

[0011] Preferably, the width of the heating circuit is ≥0.5 mm.

[0012] Preferably, the thickness of the resistance layer is 10-1000 μm.

[0013] Preferably, the first insulating protective film layer, the second insulating protective film layer and the third insulating protective film layer are independently selected from PET self-adhesive film, PEN self-adhesive film, PI self-adhesive film, PET hot melt adhesive film, PU hot melt adhesive film, PU / cloth hot melt adhesive film, cloth hot melt adhesive film, epoxy board, PET thermosetting film or PI thermosetting film.

[0014] Preferably, the single layer thickness of the first insulating protection film layer, the second insulating protection film layer and the third insulating protection film layer is 20-3000 μm.

[0015] Preferably, the material of the mesh thermal conductive layer is PI sintered graphite thermal conductive paper, natural graphite thermal conductive paper, graphene thermal conductive paper, copper foil or aluminum foil.

[0016] Preferably, the thickness of the mesh heat-conducting layer is 10-1000 μm.

[0017] Compared with the prior art, the utility model provides a heat-averaging electric heating film, including a first insulating protective film layer, a resistance layer, a second insulating protective film layer, a mesh heat-conducting layer and a third insulating protective film layer stacked in sequence; the resistance layer is composed of heating circuits distributed at a certain interval, and the heating circuits are designed in series or in parallel; the two ends of the heating circuits are respectively used as the positive and negative electrodes of the electric heating film for connecting to an external power supply. The electric heating film resistance layer provided by the utility model is designed as a heating circuit at a certain interval, which is particularly suitable for heating special-shaped parts with multiple curved surfaces, multiple hollows or multiple hollow curved surfaces; the heat-conducting layer is a mesh structure, which can not only make the protective film layers on both sides adhere better together, but also the mesh structure makes the heat conduction effect more uniform when heated. The electric heating film provided by the utility model has good heating uniformity and applicable flexibility, which can match the requirements for uniform heating of special-shaped parts, and has good application prospects in the fields of heating of interior parts of new energy vehicles, physical therapy heating, heating and home appliances that require uniform heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the heat-equalizing electric heating film provided in an embodiment of the utility model.

[0020] Explanation of the reference numerals: 1 is the first insulating protective film layer, 2 is the second insulating protective film layer, 3 is the third insulating protective film layer, 4 is the resistance layer, and 5 is the mesh thermal conductive layer. 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] The utility model provides a heat-dissipating electric heating film, such as Figure 1 As shown, it includes a first insulating protective film layer 1, a resistance layer 4, a second insulating protective film layer 2, a mesh heat-conducting layer 5 and a third insulating protective film layer 3 which are stacked in sequence.

[0023] In the electric heating film provided by the utility model, the first insulating protective film layer 1, the second insulating protective film layer 2 and the third insulating protective film layer 3 are independently selected from PET self-adhesive film, PEN self-adhesive film, PI self-adhesive film, PET hot melt adhesive film, PU hot melt adhesive film, PU / cloth hot melt adhesive film, cloth hot melt adhesive film, epoxy board, PET thermosetting film or PI thermosetting film.

[0024] In the electric heating film provided by the present invention, the single layer thickness of the first insulating protective film layer 1 , the second insulating protective film layer 2 and the third insulating protective film layer 3 is preferably 20 to 3000 μm.

[0025] In the electric heating film provided by the utility model, the resistance layer 4 is composed of heating circuits distributed at certain intervals; the heating circuits are designed in series or in parallel; the two ends of the heating circuits serve as the positive electrode and the negative electrode of the electric heating film respectively for connecting to an external power supply; the heating circuit is a single-layer structure or a multi-layer composite structure, and the material of each layer is independently selected as a metal film, graphite thermal conductive paper, graphene film, carbon fiber film or carbon crystal film.

[0026] In the electric heating film provided by the present invention, the resistance layer 4 is preferably composed of heating circuits distributed in S-shaped, U-shaped, circular, elliptical or irregular shapes at certain intervals; the width of the heating circuit is preferably ≥0.5 mm.

[0027] In the electric heating film provided by the utility model, in the resistance layer 4, the metal film is preferably aluminum foil, aluminum-plated foil, copper foil, gold foil, silver foil, black foil, nickel-chromium foil, aluminum-nickel-iron foil, tin-aluminum foil, iron-chromium-aluminum foil or hand-torn steel foil; the graphite thermal conductive paper is preferably PI sintered graphite thermal conductive paper, graphene thermal conductive paper or natural graphite thermal conductive paper.

[0028] In the electric heating film provided by the present invention, the thickness of the resistance layer 4 is preferably 10 to 1000 μm.

[0029] In the electric heating film provided by the present invention, the material of the mesh heat-conducting layer 5 is preferably PI sintered graphite heat-conducting paper, natural graphite heat-conducting paper, graphene heat-conducting paper, copper foil or aluminum foil.

[0030] In the electric heating film provided by the present invention, the thickness of the mesh heat-conducting layer 5 is preferably 10 to 1000 μm.

[0031] The electric heating film provided by the utility model has good heating uniformity and applicable flexibility, and can meet the requirements of uniform heating of special-shaped parts. More specifically, it has the following advantages:

[0032] 1) The resistance layer is designed to be a heating circuit with a certain interval and distributed in an S-shaped, U-shaped, circular, elliptical or irregular shape, which is especially suitable for heating special-shaped parts with multiple curved surfaces, multiple hollows or multiple hollow curved surfaces;

[0033] 2) The protective film used contains a variety of substrates, suitable for different temperature ranges and flame retardant requirements, and can meet the temperature resistance requirements of electric heating films below 250°C;

[0034] 3) Setting a mesh heat-conducting layer makes up for the uneven heating problem caused by the spacing distribution of the resistance layer lines and achieves uniform heating;

[0035] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0036] Example 1

[0037] A kind of Figure 1 The heat-spreading electric heating film of the structure shown is prepared according to the following steps:

[0038] 1) The heating circuit of the resistance layer 4 is obtained by laser cutting or die cutting process, and the resistance layer 4 is graphene / aluminum foil with a thickness of 15 μm;

[0039] 2) Hot pressing and aligning any surface of the resistor layer 4 with the glue surface of the first insulating protective film layer 1, the first insulating protective film layer 1 is a PI hot melt adhesive film, the PI hot melt adhesive film is pre-die-cut with electrode terminal holes for subsequent wiring testing, and the thickness is 50 μm;

[0040] 3) hot pressing and aligning the exposed surface of the resistor layer 4 with the glue surface of the second insulating protective film layer 2, wherein the second insulating protective film layer 2 is a flame retardant hot melt adhesive film with a thickness of 50 μm;

[0041] 4) Using laser or die-cutting technology to pattern the required hollow pattern on the natural graphite thermal conductive paper to obtain a mesh thermal conductive layer 5 with densely distributed circular holes and a thickness of 25 μm;

[0042] 5) hot pressing and aligning any one surface of the mesh heat-conducting layer 5 with the glue surface of the third insulating protective film layer 3, wherein the third insulating protective film layer 3 is a flame-retardant hot-melt adhesive film with a thickness of 50 μm;

[0043] 6) Aligning and hot-pressing the exposed surface of the mesh heat-conducting layer 5 and the flame-retardant fabric surface of the second insulating protective film layer 2;

[0044] 7) Perform electrode processing at the terminal hole position of the first insulating protective film layer 1, and weld or rivet the electrode lead wire to obtain Figure 1 The heat-averaging electric heating film of the structure shown can withstand temperatures of up to 100°C for a long time.

[0045] Example 2

[0046] A kind of Figure 1 The heat-spreading electric heating film of the structure shown is prepared according to the following steps:

[0047] 1) The heating circuit of the resistance layer 4 is obtained by laser cutting or die cutting process, and the resistance layer 4 is natural graphite thermal conductive paper with a thickness of 15 μm;

[0048] 2) hot pressing and aligning any surface of the resistor layer 4 with the glue surface of the first insulating protective film layer 1, the first insulating protective film layer 1 is a PI thermosetting film, the PI thermosetting film is pre-die-cut with electrode terminal holes for subsequent wiring testing, and the thickness is 50 μm;

[0049] 3) hot pressing and aligning the exposed surface of the resistor layer 4 and the glue surface of the second insulating protective film layer 2, wherein the second insulating protective film layer 2 is a PI thermosetting film with a thickness of 50 μm;

[0050] 4) Using laser or die-cutting technology to pattern the required hollow pattern on the copper foil to obtain a mesh-shaped heat-conducting layer 5 with densely distributed square holes and a thickness of 30 μm;

[0051] 5) hot pressing and aligning any one surface of the mesh heat-conducting layer 5 with the glue surface of the third insulating protective film layer 3, where the third insulating protective film layer 3 is a PI thermosetting film with a thickness of 50 μm;

[0052] 6) hot-pressing and laminating the exposed surface of the mesh heat-conducting layer 5 and the PI surface of the second insulating protective film layer 2;

[0053] 7) Perform electrode processing at the terminal hole position of the first insulating protective film layer 1, and weld or rivet the electrode lead wire to obtain Figure 1 The heat-averaging electric heating film of the structure shown can withstand a temperature of up to 130°C for a long time.

[0054] Example 3

[0055] A kind of Figure 1 The heat-spreading electric heating film of the structure shown is prepared according to the following steps:

[0056] 1) The heating circuit of the resistance layer 4 is obtained by laser cutting or die cutting process, and the resistance layer 4 is graphene / aluminum foil with a thickness of 10 μm;

[0057] 2) hot pressing and aligning any surface of the resistor layer 4 with the glue surface of the first insulating protective film layer 1, the first insulating protective film layer 1 is a PET hot melt adhesive film, the PET hot melt adhesive film is pre-die-cut with electrode terminal holes for subsequent wiring testing, and the thickness is 75 μm;

[0058] 3) hot pressing and aligning the exposed surface of the resistor layer 4 with the glue surface of the second insulating protective film layer 2, wherein the second insulating protective film layer 2 is a PET hot melt adhesive film with a thickness of 75 μm;

[0059] 4) Using laser or die-cutting technology to pattern the required hollow pattern on the PI graphite thermal conductive paper to obtain a densely distributed hexagonal mesh thermal conductive layer 5 with a thickness of 25 μm;

[0060] 5) hot pressing and aligning any one surface of the heat conductive layer 5 with the glue surface of the third insulating protective film layer 3, wherein the third insulating protective film layer 3 is a PET hot melt adhesive film with a thickness of 75 μm;

[0061] 6) hot-pressing and laminating the exposed surface of the heat-conducting layer 5 and the PET surface of the second insulating protective film layer 2;

[0062] 7) Perform electrode processing at the terminal hole position of the first insulating protective film layer 1, and weld or rivet the electrode lead wire to obtain Figure 1 The heat-averaging electric heating film of the structure shown can withstand a temperature of up to 60°C for a long time.

[0063] Example 4

[0064] A kind of Figure 1 The heat-spreading electric heating film of the structure shown is prepared according to the following steps:

[0065] 1) The heating circuit of the resistance layer 4 is obtained by laser cutting or die cutting process, and the resistance layer 4 is an iron-chromium-aluminum foil with a thickness of 30 μm;

[0066] 2) hot pressing and aligning any surface of the resistor layer 4 with the glue surface of the first insulating protective film layer 1, the first insulating protective film layer 1 is a PI thermosetting film, the PI thermosetting film is pre-die-cut with electrode terminal holes for subsequent wiring testing, and the thickness is 75 μm;

[0067] 3) hot pressing and aligning the exposed surface of the resistor layer 4 and the glue surface of the second insulating protective film layer 2, wherein the second insulating protective film layer 2 is a PI thermosetting film with a thickness of 50 μm;

[0068] 4) patterning the required hollow pattern on the graphene thermal conductive paper by laser or die-cutting process to obtain a mesh thermal conductive layer 5 with densely distributed cross holes and a thickness of 15 μm;

[0069] 5) hot pressing and aligning any one surface of the mesh heat-conducting layer 5 with the glue surface of the third insulating protective film layer 3, where the third insulating protective film layer 3 is a PI thermosetting film with a thickness of 50 μm;

[0070] 6) hot-pressing and laminating the exposed surface of the heat-conducting layer 5 and the PI surface of the second insulating protective film layer 2;

[0071] 7) Perform electrode processing at the terminal hole position of the first insulating protective film layer 1, and weld or rivet the electrode lead wire to obtain Figure 1 The heat-averaging electric heating film of the structure shown can withstand a temperature of up to 180°C for a long time.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A heat-dissipating electric heating film, characterized in that: It includes a first insulating protective film layer, a resistance layer, a second insulating protective film layer, a mesh heat-conducting layer and a third insulating protective film layer which are stacked in sequence; The resistance layer is composed of heating circuits distributed at certain intervals, and the heating circuits are designed to be connected in series or in parallel; the two ends of the heating circuit serve as the positive electrode and the negative electrode of the electric heating film respectively for connecting to an external power supply.

2. The heat-spreading electric heating film according to claim 1, characterized in that: The heating circuit is a single-layer structure or a multi-layer composite structure, and the material of each layer is independently selected as a metal film, graphite thermal conductive paper, graphene film, carbon fiber film or carbon crystal film.

3. The heat-spreading electric heating film according to claim 2, characterized in that: The metal film is aluminum foil, aluminum-plated foil, copper foil, gold foil, silver foil, black foil, nickel-chromium foil, aluminum-nickel-iron foil, tin-aluminum foil, iron-chromium-aluminum foil or hand-torn steel foil; the graphite thermal conductive paper is PI sintered graphite thermal conductive paper, graphene thermal conductive paper or natural graphite thermal conductive paper.

4. The heat-spreading electric heating film according to claim 1, characterized in that: The resistance layer is composed of heating lines distributed in an S-shape, U-shape, circular shape, elliptical shape or irregular shape at a certain interval.

5. The heat-spreading electric heating film according to claim 1, characterized in that: The width of the heating circuit is ≥0.5 mm.

6. The heat-spreading electric heating film according to claim 1, characterized in that: The thickness of the resistance layer is 10-1000 μm.

7. The heat-spreading electric heating film according to claim 1, characterized in that: The first insulating protective film layer, the second insulating protective film layer and the third insulating protective film layer are independently selected from PET self-adhesive film, PEN self-adhesive film, PI self-adhesive film, PET hot melt adhesive film, PU hot melt adhesive film, PU / cloth hot melt adhesive film, cloth hot melt adhesive film, epoxy board, PET thermosetting film or PI thermosetting film.

8. The heat-spreading electric heating film according to claim 1, characterized in that: The single layer thickness of the first insulating protection film layer, the second insulating protection film layer and the third insulating protection film layer is 20-3000 μm.

9. The heat-spreading electric heating film according to claim 1, characterized in that: The material of the mesh heat-conducting layer is PI sintered graphite heat-conducting paper, natural graphite heat-conducting paper, graphene heat-conducting paper, copper foil or aluminum foil.

10. The heat-spreading electric heating film according to claim 1, characterized in that: The thickness of the mesh heat-conducting layer is 10-1000 μm.

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