CN110351904A - A kind of thermal imaging patterning electrothermal device and electric heating products - Google Patents

Abstract

The present invention relates to a thermal imaging patterned electrothermal device, the electrothermal device comprises a heating layer and a protective layer, the heating layer is a thermal imaging patterned heating layer; and/or, the protective layer is a thermal imaging patterned protective layer. The present invention also relates to an electric heating product containing the above electric heating device. Compared with the prior art, the electrothermal device of the present invention can produce thermal imaging patterns, and the product structure is simple, suitable for mass production, and the electrothermal device can be produced on existing equipment, reducing the capital investment of secondary equipment; in addition , the thermal imaging effect of the electrothermal device of the present invention can be achieved through various ways, and has a very large design space.

Description

A thermal imaging patterned electrothermal device and electrothermal product

technical field

The invention relates to the technical field of electric heating elements, in particular to a thermal imaging patterned electric heating device and an electric heating product.

Background technique

Traditional heating methods include burning fuel and generating heat with electric heating elements. Although the former has a high thermal energy conversion rate, it causes serious environmental pollution. The latter utilizes electric heating elements to be made into various heating equipment, utilizes the mode of air convection and heat radiation to transfer heat to certain space, and equipment is convenient for installation, is convenient to family use. Commonly used electric heating products, such as electric blankets, hair dryers, electric floor heating, and electric heating films, have entered people's daily lives. At present, the vast majority of electric heating products only focus on their heating function, and are packaged and printed on the outside of the electric heating product for beautification. However, it has not been noticed in the prior art that by controlling the amount and range of thermal radiation generated by the electrothermal product, the electrothermal product can form a unique thermal imaging pattern in the thermal imaging field.

Contents of the invention

The object of the present invention is to provide a thermal imaging patterned electrothermal device with a simple structure in order to overcome the above-mentioned defects in the prior art.

The purpose of the present application is also to provide an electric heating product containing the above electric heating device.

In order to realize the purpose of the present invention, the application provides the following technical solutions.

In the first aspect, the present application provides a thermal imaging patterned electrothermal device, the electrothermal device includes a heating layer and a protective layer, characterized in that the heating layer is a thermal imaging patterned heating layer;

And/or, the protective layer is a thermal imaging patterned protective layer.

In a specific implementation manner of the first aspect, the thermal imaging patterned heating layer is a thermal imaging patterned electric heating layer, and the protective layer is a thermal imaging patterned protective layer or a uniform protective layer.

In a specific implementation manner of the first aspect, the heating layer is a heating layer that generates heat uniformly, and the protective layer is a thermal imaging patterned protective layer.

In a specific implementation manner of the first aspect, the heat generating layer is prepared by combining one or more methods of coating, printing, electroplating, metal etching and vapor deposition.

In a specific implementation manner of the first aspect, the protective layer includes one or more combinations of an insulating layer, a thermal insulation layer and a heat dissipation layer.

In a specific implementation manner of the first aspect, the thermal imaging patterned protective layer includes at least one of a thermal imaging patterned thermal insulation layer and a thermal imaging patterned heat dissipation layer, wherein in the thermal imaging patterned heat dissipation layer There are at least two heat dissipation regions with different heat dissipation capabilities; the thermal imaging patterned heat preservation layer is provided with at least two heat preservation regions with different heat preservation capabilities.

In a specific implementation manner of the first aspect, the material of the heating layer includes one of metallic materials or inorganic non-metallic materials, and the inorganic non-metallic materials include carbon materials, infrared ceramics, and tourmaline materials. One or more, preferably, the heat generating layer is made of carbon material.

In a specific implementation manner of the first aspect, the metal material includes powder, slurry or electroplating raw material made of one or more of copper, aluminum, iron and nickel;

And/or, the carbonaceous material includes powder or slurry made of one or more of graphite, conductive carbon black, carbon crystal, carbon nanotube, carbon fiber, graphene and fullerene;

The infrared ceramic and the tourmaline material are powder or slurry.

In a specific implementation manner of the first aspect, the type of the heat generating layer includes a combination of one or more of full coverage type, stripe type and hollow type; and the thickness of the heat generation layer of the full coverage type is incomplete Similarly, the thickness and/or width of the heat-generating lines in different parts of the stripe-type heat-generating layer and the hollow-out-type heat-generating layer are not all the same.

In a second aspect, the present application provides an electrothermal product, which is provided with the thermal imaging patterned electrothermal device as described above.

Compared with prior art, the beneficial effect of the present invention is:

(1) The electrothermal device of the present invention can generate thermal imaging patterns, has a simple product structure, is suitable for mass production, and has low cost.

(2) The electrothermal device of the present invention can be produced on existing equipment, reducing capital investment for secondary equipment.

(3) The thermal imaging effect of the electrothermal device of the present invention can be achieved through various ways, and has a very large design space.

(4) For heating devices that are difficult to generate heat uniformly, such as curves, circles, special shapes, and spherical surfaces, devices that can generate heat uniformly can be produced through the solution of the present invention.

Description of drawings

1 is a schematic diagram of the surface structure of the thermographic patterned heating layer in Example 1;

Fig. 2 is the sectional structure schematic diagram of electrothermal device in embodiment 1;

3 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 1;

4 is a schematic diagram of the surface structure of the thermal imaging patterned heating layer in Example 2;

5 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 2;

6 is a schematic diagram of the surface structure of the thermal imaging patterned heating layer in Example 3;

Fig. 7 is a schematic cross-sectional structure diagram of the electrothermal device in embodiment 3;

8 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 3;

9 is a schematic diagram of the surface structure of the thermal imaging patterned heating layer in Example 4;

10 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 4;

11 is a schematic diagram of the surface structure of the thermal imaging patterned heating layer in Example 5;

12 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 5;

13 is a schematic diagram of the surface structure of the thermal imaging patterned protective layer in Embodiment 6 and Embodiment 8;

Fig. 14 is a schematic cross-sectional structure diagram of the electrothermal device in embodiment 6;

15 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 6;

16 is a schematic diagram of the surface structure of the thermal imaging patterned protective layer in Embodiment 7 and Embodiment 8;

Fig. 17 is a schematic cross-sectional structure diagram of the electrothermal device in Embodiment 7;

18 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 7;

19 is a schematic diagram of the surface structure of the thermal imaging patterned heating layer in Example 8;

Fig. 20 is a schematic cross-sectional structure diagram of the electrothermal device in Embodiment 8;

FIG. 21 is a schematic diagram of the thermal imaging test results of the electrothermal device in Example 8. FIG.

In the attached drawings, 1 is the PET film, 2 is the hollow area, 3 is the thermal imaging patterned electric heating layer, 4 is the common part, 5 is the heating pattern part, 6 is the third insulating layer, 7 is the heat dissipation coating, 8 is Heat dissipation layer, 9 is the first insulation layer, 10 is the heating layer, 11 is the second insulation layer, 12 is the common insulation layer, 13 is the common insulation board, 14 is the insulation film, 15 is the insulation layer, and 16 is the common heat dissipation layer.

Detailed ways

Unless otherwise defined, the technical terms or scientific terms used in the specification and claims shall have the ordinary meanings understood by those skilled in the technical field to which the present invention belongs. All the numerical values from the lowest value to the highest value listed in this article refer to all values obtained in increments of one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units. value.

Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be pointed out that in the process of specific description of these embodiments, in order to describe briefly and concisely, it is impossible for this specification to describe all the features of the actual embodiments in detail. description of. Without departing from the spirit and scope of the present invention, those skilled in the art can modify and replace the embodiments of the present invention, and the obtained embodiments are also within the protection scope of the present invention.

Traditional electric heating devices are beautified by packaging and printing patterns, but thermal imaging cannot be achieved. The purpose of this application is to provide a thermal imaging patterned electrothermal device, the electrothermal device includes a heating layer and a protective layer, the heating layer is a thermal imaging patterned heating layer; and/or, the protective layer is a thermal imaging patterned The protective layer. Wherein, the protective layer is located on both sides or one side of the heating layer, and the main function of the protective layer is to protect the heating layer or to enable the heat generated by the heating layer to have a thermal imaging patterning function. It is preferably located on both sides of the heat generating layer.

In a specific embodiment, the thermal imaging patterned heating layer is a heating layer that generates a thermal imaging pattern by itself when energized, that is, a thermal imaging patterned heating layer, and the protective layer is a uniform protective layer.

In a specific embodiment, the thermal imaging patterned heating layer is a thermal imaging patterned electric heating layer, and the protective layer is a thermal imaging patterned protective layer, and the thermal imaging patterned electric heating layer and the thermal imaging patterned protective layer are used layer for better thermal imaging.

In a specific embodiment, the thermal imaging patterned heat generating layer includes one or more combinations of full coverage type, stripe type and hollow type. Among them, the thickness of the full-coverage thermal imaging patterned heating layer is not completely the same; the thickness and/or width of the heating lines in different parts of the striped or hollowed-out thermal imaging patterned heating layer are not all the same. Since three different types of thermal imaging patterned heating layers have different effects on the design of thermal imaging patterns, using a single type is relatively simple in design, but for complex needs, a combination of multiple types of images can also be used .

In a specific embodiment, the heat-generating layer that generates thermal imaging patterns by self-heating is prepared by a combination of one or more methods of coating, printing, electroplating, metal etching and vapor deposition. The obtained heating layer is a coating or a plating layer, both of which are planar heating, and the processing technology is simple, and the existing equipment can be used to realize the effect design, and the capital investment of the secondary equipment can be reduced.

In a specific embodiment, the process of forming thermal imaging patterns by self-heating is preferably coating or printing, both of which have lower production costs and better effects.

In a specific embodiment, the uniform protective layer includes one or more combinations of a uniform insulating layer, a uniform thermal insulation layer and a uniform heat dissipation layer. The main function of the heat dissipation layer is to dissipate the heat generated by the heating layer; the main function of the insulating layer is to isolate the current passing through the heating layer; the main function of the heat preservation layer is to prevent the heat generated by the heating layer from dissipating.

In a specific embodiment, the uniform heat dissipation layer is a general heat dissipation layer material available in the market, specifically one or more of heat dissipation coating, heat dissipation film, heat dissipation fin and heat dissipation plate. Its characteristic is that the area has approximately the same heat dissipation capacity, specifically the same specific surface area or the same thermal radiation coefficient, so that the overall heat dissipation capacity is the same.

In a specific embodiment, the uniform thermal insulation layer is a general thermal insulation layer material available in the market, specifically one or more of thermal insulation coating, thermal insulation film, thermal insulation sheet and thermal insulation board. Its characteristic is that the area has approximately the same thermal conductivity, specifically the same thickness or the same thermal conductivity, so that the overall thermal conductivity is the same.

In a specific embodiment, the heat generating layer is a heat generating layer that generates heat uniformly, and the protective layer is a thermal imaging patterned protective layer.

In a specific embodiment, the thermal imaging patterned protective layer includes at least one of a thermal imaging patterned thermal insulation layer and a thermal imaging patterned heat dissipation layer.

In a specific embodiment, at least two heat dissipation regions with different heat dissipation capabilities are provided in the thermal imaging patterned heat dissipation layer. Specifically, the heat dissipation regions with different heat dissipation capabilities are regions with different comprehensive heat dissipation capabilities formed by at least one of materials with different specific surface areas and different thermal emissivity coefficients.

In a specific embodiment, at least two heat-retaining regions with different heat-retaining capabilities are provided in the thermal imaging patterned heat-retaining layer. Specifically, the thermal insulation regions with different thermal insulation capabilities are regions with different comprehensive thermal conductivity formed by at least one of materials with different thicknesses and different thermal conductivity.

In a specific implementation manner, the protective layer further includes an insulating layer.

In a specific embodiment, the heat dissipation layer, the insulating layer and the thermal insulation layer are one or more combinations of different layers and/or the same layer. Because some materials with special materials or special structures can have the effect of heat dissipation and insulation or the effect of heat preservation and insulation at the same time. Therefore, the heat dissipation layer, insulating layer and thermal insulation layer may be formed independently, or may be composed of multiple layers in one. Considering the convenience of processing, it is preferably a multi-layer structure.

In a specific embodiment, the material of the heat generating layer includes one of metal materials or inorganic non-metal materials, and the inorganic non-metal materials include one of carbon materials, infrared ceramics and tourmaline materials or Multiple, preferably, the material of the heat generating layer is carbon material.

In a specific embodiment, the metal material includes powder, slurry or electroplating raw material made of one or more of copper, aluminum, iron and nickel.

In a specific embodiment, the carbonaceous material includes powder or slurry made from one or more of graphite, conductive carbon black, carbon crystal, carbon nanotube, carbon fiber, graphene and fullerene material. Since thermal imaging is mainly generated by infrared radiation, carbon materials are the preferred material for the heating layer in combination with electrical conductivity and infrared radiation capabilities.

In a specific embodiment, the infrared ceramic and the tourmaline material are powder or slurry.

In a specific embodiment, the electric heating device of the present invention can be in any form available on the market, preferably one or more of electric heating coating, electric heating cloth, electric heating paper, electric heating film, electric heating plate and electric heating block The combination. Considering the convenience of use, it is preferably a combination of one or more of electric heating cloth, electric heating paper, electric heating film and electric heating plate.

In a specific embodiment, the above-mentioned thermal imaging patterned electrothermal device can be applied to electrothermal products, and such electrothermal products can be applied to daily necessities, artworks, health physiotherapy, engineering construction, military training, etc.

Example

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to Examples described below.

Example 1

A thermal imaging patterned electric heating device, with PET film as the protective layer and carbon crystal as the material of the heating layer, the specific preparation steps are as follows:

(1) Using the PET film 1 as the base material, use stickers to cover the area to be hollowed out on the PET film 1. The hollowed out area is a square, a circle and a triangle;

(2) The carbon crystal conductive ink is coated on the surface of the substrate on the above-mentioned PET film 1 covered with stickers by means of coating;

(3) After the carbon crystal conductive ink is dried, the sticker is removed, and a thermal imaging patterned electric heating layer 3 with a hollow area 2 is formed on the surface of the PET film 1, as shown in Figure 1, and its cross-sectional view is shown in Figure 2 .

In this example, the PET film was purchased from Yihua Toray Polyester Film Co., Ltd., with a thickness of 150 um. Carbon crystal conductive ink was purchased from Shenzhen Lianchangda Industrial Co., Ltd., and the thickness of the thermal imaging patterned electric heating layer was 10um.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 3 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 2

A thermal imaging patterned electrothermal device, with PET film as the protective layer and graphene as the material of the heating layer, the specific preparation steps are as follows:

Use PET film as the substrate, use graphene conductive ink, and use gravure printing to print full-page patterns, wherein the gravure lines are square holes, the depth is 50 microns, the density of the ordinary part 4 is 50 mesh, and the density of the heating pattern part 5 is 100 head. A thermographic patterned electric heating layer printed on the heating pattern part 5 thinner than the normal part 4 was obtained, as shown in FIG. 4 , whose cross-sectional view is similar to that of Example 1.

In this embodiment, the PET film is purchased from Yihua Toray Polyester Film Co., Ltd., and its thickness is 150 um. The graphene conductive ink was purchased from Shenzhen Lianchangda Industrial Co., Ltd., and the thickness of the thermal imaging patterned electric heating layer was 5um.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 5 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 3

A thermal imaging patterned electric heating device, using PET film as a protective layer, conductive carbon black and carbon nanotube composite material as a heating layer material, the specific preparation steps are as follows:

Use PET film 1 as the base material, use conductive carbon black and carbon nanotube composite conductive ink, and print striped patterns by gravure printing, wherein the gravure lines are square holes with a depth of 50 microns, and the density of the common part 4 is 50 mesh. The density of the heating pattern part 5 is 80 meshes, and the thermal imaging patterned electric heating layer 3 printed on the heating pattern part 5 is thinner than the ordinary part 4, as shown in FIG. 6 . Then, a layer of PET film 1 is covered on the surface of the thermal imaging patterned electrothermal layer 3 as a protective film to form a sandwich structure, as shown in FIG. 7 .

In this embodiment, the PET film is purchased from Yihua Toray Polyester Film Co., Ltd., and its thickness is 150 um. Conductive carbon black was purchased from Cabot Company, and carbon nanotubes were purchased from Zhenjiang Tiannai Company. The mass ratio of conductive carbon black and carbon nanotubes was 1:1, and the thickness of the thermal imaging patterned electric heating layer was 5um.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 8 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 4

A thermal imaging patterned electric heating device, using an epoxy resin plate as a protective layer, and a graphene material as a heating layer material, the specific preparation steps are as follows:

Using an epoxy resin board as a base material, using graphene conductive ink, printing stretched spline stripe pattern by rotary screen printing, wherein the mesh density is 200 mesh. A thermographic patterned electrothermal layer with a narrower thermal imaging pattern printed on the heating pattern part 5 than the ordinary part 4 is obtained, as shown in FIG. 9 .

In this embodiment, the epoxy resin plate is purchased from the building materials market, and its thickness is 3 mm. Graphene was purchased from Ningbo Moxi Technology Co., Ltd., and the thickness of the thermal imaging patterned electric heating layer was 5um.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 10 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 5

A thermal imaging patterned electrothermal device, using cloth as a protective layer and graphene material as a heating layer material, the specific preparation steps are as follows:

Use cloth as the base material, use graphene conductive ink, and use rotary screen printing to print oblique cross pattern patterns, in which the mesh density is 200 mesh, the width of the common part 4 heating lines is 5 mm, and the heating pattern part 5 lines The width is 2mm. A thermographic patterned electrothermal layer with a narrower thermal imaging pattern printed on the heating pattern part 5 than the ordinary part 4 is obtained, and the structure is shown in FIG. 11 .

In this embodiment, the cloth is made of non-woven fabric, purchased from the building material market, and its thickness is 2 mm. Graphene was purchased from Ningbo Moxi Technology Co., Ltd., and the thickness of the thermal imaging patterned electric heating layer was 5um.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 12 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 6

A thermal imaging patterned electrothermal device, the specific preparation steps are as follows:

(1) Print a layer of heat dissipation coating 7 on the first insulating layer 9, and the coating shape of heat dissipation coating 7 is a square, a circle and a triangle to form a heat dissipation layer 8, as shown in Figure 13;

(2) A uniform heating layer 10 , a second insulating layer 11 and a common insulating layer 12 are sequentially covered on the heat dissipation layer 8 , the cross-sectional view of which is shown in FIG. 14 .

In this embodiment, the heat dissipation coating is made of graphene heat dissipation coating, purchased from Ningbo Moxi Technology Co., Ltd., the thickness of the heat dissipation coating is 3um, and the material of the first insulating layer is PET film, purchased from Yihua Toray Polyester Film Co., Ltd., the thickness of the first insulating layer is 150um, the material of the second insulating layer is PET film, purchased from Yihua Dongli Polyester Film Co., Ltd., the thickness of the second insulating layer is 150um, the material of the heating layer It is graphene, purchased from Ningbo Moxi Technology Co., Ltd., the thickness of the heating layer is 10um, and the material of the ordinary insulation layer is epoxy board, purchased from the building materials market, and the thickness of the ordinary insulation layer is 10mm.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 15 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 7

A thermal imaging patterned electrothermal device, the specific preparation steps are as follows:

(1) Adhere some thermal insulation films 14 with different thermal conductivity on common thermal insulation board 13, the shape of thermal insulation film 14 is a square, a circle and a triangle, forms thermal insulation layer 15, as shown in Figure 16;

(2) Cover the second insulating layer 11 , the uniform heating layer 10 , the third insulating layer 6 , and the uniform common heat dissipation layer 16 sequentially on the insulating layer 15 , as shown in FIG. 17 .

In this embodiment, the material of the thermal insulation film is PET pre-coated film, purchased from Wenzhou Kangfa Packaging Material Co., Ltd., the thickness of the thermal insulation film is 50um, and the material of the first insulating layer is PET film, purchased from Yihua Toray Polymer Co., Ltd. Ester Film Co., Ltd., the thickness of the first insulating layer is 100um, the material of the second insulating layer is PET film, purchased from Yihua Dongli Polyester Film Co., Ltd., the thickness of the second insulating layer is 100um, and the material of the heating layer is Graphene, purchased from Ningbo Moxi Technology Co., Ltd., the thickness of the heating layer is 10um, and the material of the insulation layer is epoxy board, which is purchased from the building materials market. The thickness of the ordinary heat dissipation layer is 3mm.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 18 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

Example 8

A thermal imaging patterned electrothermal device, the specific preparation steps are as follows:

(1) Get a common thermal insulation board 13, and adhere some thermal insulation films 14 with different thermal conductivity to the common thermal insulation board 13 to form a thermal insulation layer 15, as shown in Figure 16;

(2) Print one deck of heat dissipation coating 7 on the first insulating layer to form heat dissipation layer 8, wherein, the area where heat dissipation coating 7 is located in heat dissipation layer 8 corresponds to the area where heat insulation film 14 is located in insulation layer 15, as shown in Figure 13 shown;

(3) Print a grid-shaped thermal imaging patterned electrothermal layer 3 on the surface of the thermal insulation layer 15, wherein the printing ink is graphene, and in the corresponding area of the ordinary thermal insulation board 13 in the thermal insulation layer 15, the thermal imaging patterned electrothermal layer 3 The mesh number is 40 mesh, the thickness is 5um, and the thickness of the corresponding area of the heat preservation film 14 in the heat preservation layer 15 is 50um. The structure of the thermal imaging patterned electric heating layer 3 is shown in FIG. 19 .

(4) Fix the heat dissipation layer 8 on the other side of the thermal imaging patterned electrothermal layer 3, make the area where the heat dissipation coating 7 overlaps with the thermal insulation film 14, and form an electrothermal device as shown in FIG. 20 .

In this embodiment, the common insulation board is made of epoxy board, purchased from the building material market, and its thickness is 3 mm. The material of the thermal insulation film is PET pre-coated film, purchased from Wenzhou Kangfa Packaging Materials Co., Ltd., and the thickness of the thermal insulation film is 50um. The heat dissipation coating is made of graphene, which was purchased from Ningbo Moxi Technology Co., Ltd. The thickness of the heat dissipation coating is 3um, and the graphene was purchased from Ningbo Moxi Technology Co., Ltd.

The thermal imaging test was performed after the electrothermal device prepared above was energized, and the results are shown in FIG. 21 . From this we can find that the electrothermal device of this embodiment has a thermal imaging patterning function.

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present application. It will be apparent to those skilled in the art that various modifications to these embodiments can be easily made, and the general principles described here can be applied to other embodiments without creative efforts. Therefore, the present application is not limited to the embodiments here, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.

Claims (10)

1. A thermal imaging patterned electrothermal device, the electrothermal device comprising a heating layer and a protective layer, characterized in that the heating layer is a thermal imaging patterned heating layer; And/or, the protective layer is a thermal imaging patterned protective layer. 2. The thermal imaging patterned electrothermal device according to claim 1, wherein the thermal imaging patterned heating layer is a thermal imaging patterned electrothermal layer, and The protective layer is a thermal imaging patterned protective layer or a uniform protective layer. 3 . The thermal imaging patterned electrothermal device according to claim 1 , wherein the heating layer is a heating layer that generates heat uniformly, and the protective layer is a thermal imaging patterned protective layer. 4 . 4. The thermal imaging patterned electrothermal device according to claim 1, wherein the heating layer is prepared by combining one or more methods of coating, printing, electroplating, metal etching and evaporation . 5 . The thermal imaging patterned electrothermal device according to claim 1 , wherein the protective layer comprises one or more combinations of an insulating layer, a thermal insulation layer and a heat dissipation layer. 6 . 6. The thermal imaging patterned electrothermal device according to any one of claims 1 to 5, wherein the thermal imaging patterned protective layer comprises at least one of a thermal imaging patterned thermal insulation layer and a thermal imaging patterned heat dissipation layer species, of which: The thermal imaging patterned heat dissipation layer is provided with at least two heat dissipation regions with different heat dissipation capabilities; The thermal imaging patterned thermal insulation layer is provided with at least two thermal insulation regions with different thermal insulation capabilities. 7. The thermal imaging patterned electrothermal device according to any one of claims 1 to 5, wherein the material of the heating layer includes one of metal materials or inorganic non-metallic materials, and the inorganic non-metallic materials include One or more of carbon materials, infrared ceramics and tourmaline materials, preferably, the heat generating layer is made of carbon materials. 8. The thermal imaging patterned electrothermal device according to claim 7, wherein the metal material comprises powder, paste or electroplating made of one or more of copper, aluminum, iron and nickel raw material; And/or, the carbonaceous material includes powder or slurry made of one or more of graphite, conductive carbon black, carbon crystal, carbon nanotube, carbon fiber, graphene and fullerene; The infrared ceramic and the tourmaline material are powder or slurry. 9. The thermal imaging patterned electrothermal device according to claim 1, wherein the type of the heating layer comprises one or more combinations of full coverage type, stripe type and hollow type; and the full The covering type heat generating layer has different thicknesses, and the thickness and/or width of the heat generating lines in different parts of the stripe type heat generating layer and the hollow type heat generating layer are not all the same. 10. An electric heating product, characterized in that the electric heating product is provided with the thermal imaging patterned electric heating device according to any one of claims 1-9.