Planar heating film and electric heating product

Abstract

The utility model relates to a planar heating film and an electric heating product, comprising a heating layer, the heating layer comprises a base material layer, an electrode structure layer and a conductive coating, the electrode structure layer comprises a first main electrode, a plurality of first branch electrodes, a second main electrode and a plurality of second branch electrodes, the first branch electrodes and the second branch electrodes extend oppositely to form an interdigital structure, and the distance between each first branch electrode and the second main electrode is larger than or equal to the distance between the adjacent first branch electrode and second branch electrode. The distance between each second branch electrode and the first main electrode is larger than or equal to the distance between the adjacent first branch electrode and second branch electrode. Compared with a traditional surface heating film, the conductive coating can be coated on the whole surface and cover the area between the main electrode and the branch electrode, so that the area can emit heat, the area is utilized, the effective heating area is increased, and the heating efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of surface heating films, and particularly relates to a surface heating film and an electric heating product. Background Art

[0002] A surface heating film is a sheet-like heating film that can generate heat and is widely used in various heating devices. In the technical field of heating film preparation, traditional surface heating films are mainly made by coating a conductive material on a substrate, such as carbon-based, ITO, metal grids, etc. However, these materials themselves need to have a relatively large resistance due to heat generation and cannot be used as the main current-collecting line, so an additional main current-collecting line needs to be added.

[0003] The traditional solution is to adopt the design of interdigital electrodes. As Figure 1 shown, the interdigital electrode structure includes a first main electrode 1 and a second main electrode 2 that are oppositely arranged at intervals. A plurality of first branch electrodes 3 are arranged on the first main electrode 1, and a plurality of second branch electrodes 4 are arranged on the second main electrode 2. The plurality of first branch electrodes 3 and the plurality of second branch electrodes 4 extend towards each other to form an interdigital structure. When the conductive coating 5 is applied, it needs to avoid the first main electrode 1 and the second main electrode 2 and can only be applied on the first branch electrodes 3 and the second branch electrodes 4 to form main electrode current collection, and the area between the branch electrodes forms a heating area, so that the overall heating area is a rectangular heating block. However, for some special-shaped heating films, the rectangular heating block will cause uneven heating of the special-shaped heating film and there are many non-heating areas, as Figure 2 shown.

[0004] Chinese Patent CN214544827U discloses a horse-belly-shaped heating film, which includes a horse-belly-shaped substrate layer and a first main path electrode, a second main path electrode, a plurality of first branch electrodes, a plurality of second branch electrodes and a heating film coating arranged on the horse-belly-shaped substrate layer. The first main path electrode and the second main path electrode are arranged at both ends of the long bottom edge of the horse-belly-shaped substrate layer. One end of the first branch electrode is electrically connected to the first main path electrode, and the other end extends towards the second main path electrode to form a U-shaped branch. One end of the second branch electrode is electrically connected to the second main path electrode, and the other end extends towards the first main path electrode to form a U-shaped branch. However, when designing this heating film, not only the first main path electrode and the second main path electrode need to be electrically insulated from the heating film coating, but also the first branch electrode needs to be electrically insulated from the second main path electrode, and the second branch electrode needs to be electrically insulated from the first main path electrode. Thus, when the heating film coating is applied, it needs to avoid the first main path electrode and the second main path electrode, such as covering the first main path electrode and the second main path electrode with a mask such as tape, and then tearing off the tape after the coating is completed, and the coating process is complicated; or using a coating machine that can specify the shape, and the cost is relatively high. Summary of the Invention

[0005] The technical problem to be solved by the present utility model is to provide, in view of the deficiencies of the prior art, a planar heating film with a simple coating process, low coating cost and a larger effective heating area, which can directly coat the conductive coating on the whole surface.

[0006] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] A planar heating film includes a heating layer. The heating layer includes a substrate layer, an electrode structure layer disposed on the substrate layer, and a conductive coating. The electrode structure layer includes a first main electrode, a plurality of first branch electrodes with one end connected to the first main electrode, a second main electrode, and a plurality of second branch electrodes with one end connected to the second main electrode. The first main electrode and the second main electrode are arranged opposite to each other at intervals. The plurality of first branch electrodes and the plurality of second branch electrodes extend towards each other to form an interdigital structure, and each first branch electrode is not directly connected to the second main electrode, and each second branch electrode is not directly connected to the first main electrode. The distance between each first branch electrode and the second main electrode is greater than or equal to the distance between adjacent first branch electrodes and second branch electrodes, and the distance between each second branch electrode and the first main electrode is greater than or equal to the distance between adjacent first branch electrodes and second branch electrodes;

[0008] The electrode structure layer and the conductive coating are arranged in sequence, and the electrode structure layer is located between the substrate layer and the conductive coating, or the conductive coating is located between the substrate layer and the electrode structure layer.

[0009] By adopting the above technical solutions, it can be ensured that the conductive coating does not need to be deliberately arranged to avoid the first main electrode and the second main electrode. The conductive coating can completely cover the first main electrode, the second main electrode, the first branch electrodes and the second branch electrodes, so that the conductive coating can be designed for full-surface coating, or only cover the first branch electrodes and the second branch electrodes, and the design of the conductive coating is more flexible.

[0010] In some embodiments, the distance between adjacent first branch electrodes and second branch electrodes, the distance between each first branch electrode and the second main electrode, and the distance between each second branch electrode and the first main electrode are respectively greater than or equal to 1 mm.

[0011] In some specific embodiments, the intervals between any two adjacent first branch electrodes and second branch electrodes are equal; the distances between each first branch electrode and the second main electrode are equal, and the distances between each second branch electrode and the first main electrode are equal.

[0012] In some specific embodiments, the distance between each of the first branch electrodes and the second main electrode is equal to the distance between adjacent first and second branch electrodes, and the distance between each of the second branch electrodes and the first main electrode is equal to the distance between adjacent first and second branch electrodes.

[0013] In some specific embodiments, the distance between each of the first branch electrodes and the second main electrode is greater than the distance between adjacent first and second branch electrodes, and the distance between each of the second branch electrodes and the first main electrode is greater than the distance between adjacent first and second branch electrodes.

[0014] In some specific embodiments, the distance between adjacent first and second branch electrodes, the distance between each first branch electrode and the second main electrode, and the distance between each second branch electrode and the first main electrode are each 1 - 500 mm. Specifically, such as 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 15 mm, 30 mm, 60 mm, 100 mm, 200 mm, 300 mm, 400 mm, or 500 mm.

[0015] In some specific embodiments, the conductive coating covers all of the first main electrode, the second main electrode, the first branch electrodes, and the second branch electrodes. The regions between the first main electrode and the second branch electrodes and between the second main electrode and the first branch electrodes can be utilized, enabling these regions to also generate heat and increasing the effective heating area.

[0016] In some other specific embodiments, the conductive coating covers all of the first branch electrodes and the second branch electrodes while avoiding the first main electrode and the second main electrode. In some specific examples, the conductive coating can cover only all of the first branch electrodes and all of the second branch electrodes.

[0017] In some specific embodiments, the planar heating film is a special-shaped heating film. The substrate layer is a special-shaped substrate layer.

[0018] In some specific embodiments, the planar heating film is a flexible heating film.

[0019] In some specific embodiments, the width of each of the first branch electrodes and the width of each of the second branch electrodes are each 0.3 - 5 mm; the width of the first main electrode and the width of the second main electrode are each 3 - 15 mm, adjustable according to the magnitude of the current. For example, when the current is 1 - 5 A, the width of the first main electrode and the width of the second main electrode are each 3 - 5 mm; when the current is 5 - 10 A, the width of the first main electrode and the width of the second main electrode are each 5 - 10 mm; when the current is 10 - 20 A, the width of the first main electrode and the width of the second main electrode are each 10 - 15 mm.

[0020] In some specific embodiments, the thickness of the conductive coating is 5-50 μm; such as 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm.

[0021] In some specific embodiments, the conductive coating is a conductive carbon film, an ITO film or a metal nanowire film. The carbon film is formed on the electrode structure layer or the substrate layer by any one of screen printing, coating, deposition, and papermaking processes.

[0022] Further, the conductive carbon film refers to a conductive thin film mainly composed of sp2 hybridized carbon as the conductive material.

[0023] The conductive carbon film is a conductive thin film formed by CVD deposition of a mixture of one or more of graphite, conductive carbon black, carbon nanotubes, and graphene, or a conductive thin film formed by melt blending a mixture of one or more of graphite, conductive carbon black, carbon nanotubes, graphene, and carbon fiber powder with a polymer resin and an additive and then forming a film, or a conductive thin film formed by dispersing and blending a mixture of one or more of graphite, conductive carbon black, carbon nanotubes, graphene, and carbon fiber powder with a polymer resin solution and an additive and then forming and drying a film, or a conductive thin film prepared by a papermaking process after dispersing a mixture of one or more of graphite, conductive carbon black, carbon nanotubes, graphene, and carbon fiber powder with artificial synthetic fibers or natural fibers. The slurry for making the carbon film can be obtained commercially.

[0024] In some specific embodiments, the conductive carbon film can form a self-supporting independent film, or can be attached to a single-sided planar substrate or encapsulated within a double-sided planar substrate.

[0025] In some specific embodiments, the thicknesses of the first main electrode, the second main electrode, the first branch electrode, and the second branch electrode are 5-200 μm respectively, further 10-100 μm, specifically such as 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm.

[0026] In some specific embodiments, the first main electrode, the second main electrode, the first branch electrode, and the second branch electrode are respectively a copper electrode, a silver electrode, an aluminum electrode, a nickel electrode, a tin electrode, a gold electrode, a carbon electrode or their alloy components; they can be obtained by processes such as etching, die cutting, spraying, printing (including screen printing, gravure printing), etc.

[0027] In some specific embodiments, the substrate layer is modified or unmodified, or coated with a pre-coating to increase the coating adhesion, and is polyimide, polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride, epoxy resin, phenolic resin or silicone rubber.

[0028] In some embodiments, the heating film further includes a first insulating encapsulation layer and a second insulating encapsulation layer, and the heating layer is encapsulated between the first insulating encapsulation layer and the second insulating encapsulation layer.

[0029] In some specific embodiments, the first insulating encapsulation layer includes a first insulating layer and a first adhesive layer disposed on one side of the first insulating layer, the second insulating encapsulation layer includes a second insulating layer and a second adhesive layer disposed on one side of the second insulating layer, and the heating layer is adhered between the first adhesive layer and the second adhesive layer;

[0030] The first insulating layer and the second insulating layer are each independently selected from a polyester film, a polyimide film, a silicone rubber or a natural vulcanized or semi-vulcanized rubber film, an epoxy board, a mica board, a polytetrafluoroethylene film, a polyvinylidene fluoride film, a polyethylene film, a polypropylene film or a polyvinyl chloride film.

[0031] The adhesives used for the first adhesive layer and the second adhesive layer are respectively uncured adhesives, heat-conducting materials or fully cured resins. Among them, the uncured adhesives are acrylic resin adhesives, silicone adhesives, polyurethane adhesives; the heat-conducting materials are heat-conducting silicone greases; the fully cured resins are epoxy resins, acrylic resins, silicones, polyurethane resins or polyurea resins, fluorocarbon resins, polyester resins, vinyl ester resins, alkyd resins.

[0032] The second technical solution adopted by the present invention: an electric heating product, comprising the above-mentioned planar heating film.

[0033] Specifically, the electric heating product includes a flexible wearable heating product, a heating seat, a seat cushion, a roof, an armrest, a steering wheel, an electric blanket, a yoga mat, a pet mat, a table mat.

[0034] The flexible wearable heating product such as a heating garment, a heating knee pad, a heating insole and various wearable flexible heating physiotherapy instruments and devices.

[0035] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0036] Compared with the traditional surface heating film, the present invention sets the distance between the first branch electrode and the second main electrode and the distance between the second branch electrode and the first main electrode to be greater than or equal to the distance between adjacent first branch electrodes and second branch electrodes, so that the conductive coating not only has a simple coating process, does not need to use tapes or the like to cover the main electrodes, nor does it need to use a coating machine with a specified shape, greatly reducing the coating cost. Moreover, the conductive coating can cover the area between the main electrodes and the branch electrodes, enabling these areas to also generate heat, making use of these areas, increasing the effective heating area, and having a higher heating efficiency. Brief Description of the Drawings

[0037] Figure 1 is a schematic structural diagram of the electrode structure and the conductive coating of a traditional rectangular heating film;

[0038] Figure 2 is a schematic structural diagram of a traditional special-shaped heating film;

[0039] Figure 3 is a schematic structural diagram of the special-shaped surface heating film of Example 1;

[0040] Figure 4 is Figure 3 a schematic structural diagram of the electrode structure layer and the conductive coating of the special-shaped surface heating film of;

[0041] Figure 5 is Figure 3 a schematic cross-sectional structural diagram of the special-shaped surface heating film of;

[0042] Figure 6 is a schematic cross-sectional structural diagram of the special-shaped surface heating film of Example 2;

[0043] In the figures: 1, the first main electrode; 2, the second main electrode; 3, the first branch electrode; 4, the second branch electrode; 5, the conductive coating; 6, the base material layer; 7, the first insulating layer; 8, the second insulating layer; 9, the first adhesive layer; 10, the second adhesive layer. Detailed Embodiments

[0044] The following further describes the present invention in conjunction with the accompanying drawings of the specification and specific embodiments:

[0045] Example 1

[0046] Referring to Figures 3 to 5 , the special-shaped surface heating film of this example includes a heating layer, and the heating layer includes a special-shaped base material layer 6, an electrode structure layer formed on the base material layer 6, and a conductive coating 5. The electrode structure layer includes a first main electrode 1, a plurality of first branch electrodes 3 with one end connected to the first main electrode 1, a second main electrode 2, and a second branch electrode 4 with one end connected to the second main electrode 2. The first main electrode 1 and the second main electrode 2 are arranged opposite to each other at intervals. The plurality of first branch electrodes 3 and the plurality of second branch electrodes 4 extend towards each other to form an interdigital structure, and each first branch electrode 3 is not directly connected to the second main electrode 2, and each second branch electrode 4 is not directly connected to the first main electrode 1.

[0047] Referring to Figure 3 , the distance H1 between each first branch electrode 3 and the second main electrode 2 is greater than or equal to the distance H3 between adjacent first branch electrodes 3 and second branch electrodes 4, and the distance H2 between each second branch electrode 4 and the first main electrode 1 is greater than or equal to the distance H3 between adjacent first branch electrodes 3 and second branch electrodes 4.

[0048] In some specific examples, the spacing H1 between each first branch electrode 3 and the second main electrode 2 is greater than the spacing H3 between adjacent first branch electrode 3 and second branch electrode 4, and the spacing H2 between each second branch electrode 4 and the first main electrode 1 is greater than the spacing H3 between adjacent first branch electrode 3 and second branch electrode 4.

[0049] When the conductive coating 5 is coated, there is no need to deliberately avoid the first main electrode 1 and the second main electrode 2. Instead, it can be coated on the entire surface of the electrode structure layer. Finally, the conductive coating 5 is formed on the electrode structure layer, and the conductive coating 5 covers the first main electrode 1, the second main electrode 2, all the first branch electrodes 3 and all the second branch electrodes 4. The conductive coating 5 can connect the first main electrode 1 and the second branch electrode 4, and connect the second main electrode 2 and the first branch electrode 3. Compared with the traditional special-shaped heating film, the conductive coating 5 not only has a simple coating process, does not require using tapes to cover the first main electrode 1 and the second main electrode 2, nor does it require a coating machine with a specified shape, greatly reducing the coating cost, but also the conductive coating 5 covers the area between the first main electrode 1 and the second branch electrode 4, and the area between the second main electrode 2 and the first branch electrode 3, enabling these areas to generate heat as well, making use of these areas and increasing the effective heating area, with a higher heating efficiency.

[0050] The spacing H3 between adjacent first branch electrode 3 and second branch electrode 4, the spacing H1 between each first branch electrode 3 and the second main electrode 2, and the spacing H2 between each second branch electrode 4 and the first main electrode 1 are respectively greater than or equal to 1 mm to prevent the heating film from being broken down due to overheating.

[0051] In some specific examples, the spacing H3 between adjacent first branch electrode 3 and second branch electrode 4, the spacing H1 between each first branch electrode 3 and the second main electrode 2, and the spacing H2 between each second branch electrode 4 and the first main electrode 1 are all equal, such as 3 mm.

[0052] In some specific examples, the width of each first branch electrode 3 and the width of each second branch electrode 4 are 0.5 mm respectively, the width of the first main electrode 1 and the width of the second main electrode 2 are 5 mm respectively; the first main electrode 1, the second main electrode 2, the first branch electrode 3 and the second branch electrode 4 are respectively made of copper electrodes, and the thicknesses are 10 μm respectively.

[0053] In some specific examples, the thickness of the conductive coating 5 is 10 μm. The conductive coating 5 uses a conductive carbon film, such as a carbon film formed by carbon nanotubes, which has good electrical conductivity. The carbon paste containing carbon nanotubes is screen-printed onto the electrode structure layer, and it can be printed on the entire surface without deliberately avoiding the first main electrode 1 and the second main electrode 2, greatly improving the printing efficiency.

[0054] In some specific embodiments, the substrate layer 6 is a PI film coated with an adhesive.

[0055] See Figure 5 , the irregular surface-shaped heating film further includes a first insulating encapsulation layer and a second insulating encapsulation layer, and the heating layer is encapsulated between the first insulating encapsulation layer and the second insulating encapsulation layer.

[0056] The first insulating encapsulation layer includes a first insulating layer 7 and a first adhesive layer 9 provided on one side surface of the first insulating layer 7. The second insulating encapsulation layer includes a second insulating layer 8 and a second adhesive layer 10 provided on one side surface of the second insulating layer 8. The heating layer is adhered between the first adhesive layer 9 and the second adhesive layer 10. The substrate layer 6 is adhered to the first adhesive layer 9, and the conductive coating 5 is adhered to the second adhesive layer 10.

[0057] In some specific examples, the first insulating layer 7 and the second insulating layer 8 can respectively be selected from polyester films, polyimide films, silicone rubbers or natural vulcanized or semi-vulcanized rubber films, epoxy boards, mica boards, polytetrafluoroethylene films, polyvinylidene fluoride films, polyethylene films, polypropylene films or polyvinyl chloride films.

[0058] The adhesives used for the first adhesive layer 9 and the second adhesive layer 10 can be uncured adhesives, heat-conducting materials or fully cured resins. Uncured adhesives such as acrylic resin adhesives, silicone adhesives, polyurethane adhesives; heat-conducting materials such as heat-conducting silicone grease; fully cured resins such as epoxy resins, acrylic resins, silicones, polyurethane resins or polyurea resins, fluorocarbon resins, polyester resins, vinyl ester resins, alkyd resins.

[0059] Example 2

[0060] See Figure 6 , the irregular surface-shaped heating film provided in this embodiment has the same basic structure as that in Example 1, and the difference lies in that: the conductive coating 5 is located between the electrode structure layer and the substrate layer 6.

[0061] Specifically, a carbon film is coated on the substrate layer 6 to form the conductive coating 5, and then the electrode structure layer is printed on the carbon film by means of screen printing, gravure printing, spraying, etc.

[0062] The first main electrode, the second main electrode, the first branch electrode and the second branch electrode of the electrode structure layer can all be provided on the carbon film, and the first main electrode and the second main electrode do not need to be deliberately arranged to avoid the carbon film. The production cost is greatly reduced.

[0063] The special-shaped surface heating film can be a flexible surface heating film or a non-flexible surface heating film, and can be widely applied in the fields of heating of electronic devices, heating devices, and devices with special shapes. First, the special-shaped surface heating film connects the branch electrodes and the main electrodes of the interdigital electrodes through a conductive coating, increasing the effective heating area, improving the heating efficiency, and meeting the requirements of electronic devices for high-performance heating films. Second, the special-shaped heating film can achieve S-shaped wire routing for heating, and the conductive coating can be applied without deliberately avoiding the main electrodes, solving the problem of difficult design of existing block-shaped heating areas, enabling the special-shaped heating film to be better applied to special-shaped devices, and meeting the requirements of the heating device manufacturing field for special-shaped heating films. In addition, the special-shaped heating film also utilizes the area between the main electrode and the branch electrodes, effectively improving the design accuracy of the heating area, reducing the non-heating area, improving the use effect of the heating film, and having broad market prospects and application value.

[0064] The special-shaped heating film has a wide range of applications. It can be applied not only to traditional planar devices but also to various special-shaped devices, and has high practical value. Specifically, it can be used for heating clothing, heating knee pads, heating insoles, and various wearable flexible heating physiotherapy instruments and devices, as well as various products such as heating seats, seat cushions, electric blankets, and yoga mats.

[0065] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A planar heating film, comprising a heating layer, wherein the heating layer includes a substrate layer, an electrode structure layer disposed on the substrate layer, and a conductive coating. The electrode structure layer includes a first main electrode, a plurality of first branch electrodes with one end connected to the first main electrode, a second main electrode, and a plurality of second branch electrodes with one end connected to the second main electrode. The first main electrode and the second main electrode are disposed opposite to each other at intervals. The plurality of first branch electrodes and the plurality of second branch electrodes extend towards each other to form an interdigital structure, and there is no direct connection between each first branch electrode and the second main electrode, and there is no direct connection between each second branch electrode and the first main electrode. It is characterized in that: The distance between each of the first branch electrodes and the second main electrode is greater than or equal to the distance between adjacent first and second branch electrodes, and the distance between each of the second branch electrodes and the first main electrode is greater than or equal to the distance between adjacent first and second branch electrodes; The electrode structure layer and the conductive coating are arranged in sequence, and the electrode structure layer is located between the substrate layer and the conductive coating, or the conductive coating is located between the substrate layer and the electrode structure layer.

2. The planar heating film according to claim 1, wherein: The intervals between any two adjacent first and second branch electrodes are all equal; and / or, the distances between each first branch electrode and the second main electrode are equal, and the distances between each second branch electrode and the first main electrode are equal; and / or, the distance between adjacent first and second branch electrodes, the distance between each first branch electrode and the second main electrode, and the distance between each second branch electrode and the first main electrode are respectively greater than or equal to 1 mm.

3. The planar heating film according to claim 2, characterized in that: The distance between each of the first branch electrodes and the second main electrode is greater than the distance between adjacent first and second branch electrodes, and the distance between each of the second branch electrodes and the first main electrode is greater than the distance between adjacent first and second branch electrodes; and / or, the distance between adjacent first and second branch electrodes, the distance between each first branch electrode and the second main electrode, and the distance between each second branch electrode and the first main electrode are respectively 1 - 500 mm.

4. The planar heating film according to claim 1, characterized in that: The conductive coating covers all of the first main electrode, the second main electrode, the first branch electrodes, and the second branch electrodes; or, the conductive coating covers all of the first and second branch electrodes while avoiding the first and second main electrodes.

5. The planar heating film according to claim 1, wherein: The planar heating film is a special-shaped heating film; and / or, the substrate layer is a special-shaped substrate layer; and / or, the planar heating film is a flexible heating film.

6. The planar heating film according to claim 1, characterized in that: The width of each of the first branch electrodes and the width of each of the second branch electrodes are respectively 0.3 - 5 mm; the widths of the first main electrode and the second main electrode are respectively 3 - 15 mm, adjustable according to the magnitude of the current; and / or, the thickness of the conductive coating is 5 - 50 μm; and / or, the conductive coating is a conductive carbon film, an ITO film, or a metal nanowire film; and / or, the thicknesses of the first main electrode, the second main electrode, the first branch electrodes, and the second branch electrodes are respectively 5 - 200 μm; and / or, the first main electrode, the second main electrode, the first branch electrodes, and the second branch electrodes are respectively copper electrodes, silver electrodes, aluminum electrodes, nickel electrodes, tin electrodes, gold electrodes, carbon electrodes, or their alloy components; and / or, The substrate layer is modified or unmodified polyimide, polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride, epoxy resin, phenolic resin, or silicone rubber, or is coated with a pre-coating to increase the coating adhesion.

7. The planar heating film according to claim 6, wherein: The conductive carbon film can form a self-supporting independent film, or the conductive carbon film can be attached to a single-sided planar substrate or encapsulated within a double-sided planar substrate.

8. The planar heating film according to any one of claims 1 to 7, characterized in that: The heating film further includes a first insulating encapsulation layer and a second insulating encapsulation layer, and the heating layer is encapsulated between the first insulating encapsulation layer and the second insulating encapsulation layer.

9. The planar heating film according to claim 8, wherein: The first insulating encapsulation layer includes a first insulating layer and a first adhesive layer provided on one side surface of the first insulating layer, the second insulating encapsulation layer includes a second insulating layer and a second adhesive layer provided on one side surface of the second insulating layer, and the heating layer is adhered between the first adhesive layer and the second adhesive layer; The first insulating layer and the second insulating layer are independently selected from polyester film, polyimide film, silicone rubber or natural vulcanized or semi-vulcanized rubber film, epoxy board, mica board, polytetrafluoroethylene film, polyvinylidene fluoride film, polyethylene film, polypropylene film or polyvinyl chloride film; and / or, the adhesives used for the first adhesive layer and the second adhesive layer are respectively uncured adhesives, thermal conductive materials or fully cured resins, wherein the uncured adhesives are acrylic resin adhesives, silicone adhesives, polyurethane adhesives; the thermal conductive material is thermal conductive silicone grease; the fully cured resins are epoxy resins, acrylic resins, silicone, polyurethane resins or polyurea resins, fluorocarbon resins, polyester resins, vinyl ester resins, alkyd resins.

10. An electric heating product, characterized in that: Comprising the planar heating film according to any one of claims 1 to 9; the electric heating product includes a flexible wearable heating product, a heating seat, a seat cushion, a ceiling, an armrest, a steering wheel, an electric blanket, a yoga mat, a pet mat, a table mat.

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