Electric heating film, manufacturing method and heating device

Abstract

The present invention discloses an electric heating film, a manufacturing method and a heating device, wherein the electric heating film comprises a carrier body, an electric heating layer arranged on the carrier body and a packaging layer composited with the carrier body and the electric heating layer, wherein the electric heating layer comprises a brittle conductive material, and the carrier body is a first thermally deformable material. The electric heating film in the present invention comprises a carrier body and an electric heating layer arranged on the carrier body, wherein the carrier body is encapsulated between electrically insulating packaging layers, wherein the carrier body carrying the electric heating layer is a first thermally deformable material, and the electric heating layer located on the carrier layer comprises a brittle conductive material, if the electric heating film works abnormally and the temperature exceeds the thermal deformation temperature of the carrier body, the carrier body will deform, causing the electric heating layer to break, thereby causing the entire electric heating film to be short-circuited and stop heating, effectively solving the safety performance problem of the electric heating film, and the construction is convenient and low-cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating, and in particular to an electric heating film, a manufacturing method and a heating device. Background Art

[0002] As it is in line with the development trend of low-carbon economy and with the resolution of technical and material cost issues, the application scope of electric heating film is becoming wider and wider. Electric heating film is a thin film heating body that can generate heat after being powered on. Its structure is divided into three parts, namely the electric heating layer, busbar and packaging layer. When working, the current passes through the electric heating layer, causing it to generate heat, and then the heat is sent into the space through the packaging layer in the form of radiation, so that the heated object can directly obtain heat. Its comprehensive effect is better than the traditional convection heating method.

[0003] However, the safety of the electric heating film is an issue that cannot be ignored. During the use of the electric heating film, if the voltage is overvoltage or the heat dissipation is poor, there is a risk of fire caused by excessive temperature. There are currently two main ways to solve this problem. Method 1: Equip the electric heating film with a temperature-sensitive overheating protection device. A negative temperature coefficient thermistor device is bonded to the electric heating film and forms a series circuit with the electric heating film. When the temperature is higher than the safe temperature of the electric heating film, the thermistor will increase sharply, causing the circuit to be broken. However, each square meter of the electric heating film is often equipped with 10 to 20 overheating protection devices, which is extremely inconvenient to use and increases the cost of the electric heating film. Method 2: Equip the electric heating film with a heat dissipation device. Bond the electric heating film to a metal plate or sheet with high thermal conductivity to increase thermal conductivity, and further equip it with a fan and other devices to accelerate heat dissipation. However, this method not only increases costs, but also is extremely inconvenient to construct.

[0004] Therefore, how to ensure the safety of electric heating film has become a problem that needs to be solved urgently. Summary of the invention

[0005] In order to effectively overcome the above-mentioned defects of the prior art, the embodiment of the present invention creatively provides an electric heating film, including a carrier body, an electric heating layer arranged on the carrier body, and a packaging layer composited outside the carrier body and the electric heating layer, the electric heating layer includes a brittle conductive material, and the carrier body is a first thermally deformable material.

[0006] In one embodiment, the brittle conductive material includes one or more of a graphene film and a conductive ink.

[0007] In one embodiment, the raw material of the first thermally deformable material includes one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone.

[0008] In one embodiment, the packaging layer is selected as a second thermally deformable material, the thermal deformation temperature of the second thermally deformable material is higher than the thermal deformation temperature of the first thermally deformable material, and the raw material of the packaging layer includes one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone materials.

[0009] In one possible implementation manner, the electric heating layer includes an electrode layer and a membrane layer, and the electrode layer is connected to the membrane layer.

[0010] On the other hand, the present invention provides a method for manufacturing an electric heating film, the method comprising: using a first thermally deformable material to form a carrier body; using a brittle conductive material to form an electric heating layer on the carrier body; using a second thermally deformable material to form a packaging layer on the periphery of the carrier body formed with the electric heating layer.

[0011] In one possible embodiment, the method of forming an electric heating layer on the carrier body using a brittle conductive material includes: forming a film layer on the first surface of the carrier body using a brittle conductive material; or forming a film layer on the first surface and the second surface of the carrier body using a brittle conductive material, wherein the second surface is located on the back of the first surface.

[0012] In one possible implementation manner, the use of brittle conductive material to form an electric heating layer on the carrier body includes: compounding conductive ink on the surface of the carrier body by screen printing; drying the conductive ink printed on the carrier body to form a film layer; or, compounding a graphene film on the carrier body by wet transfer to form a film layer.

[0013] In one possible implementation manner, the electric heating layer is formed on the carrier body by using a brittle conductive material, and further comprises: forming an electrode layer on the carrier body by using a bus bar.

[0014] Another aspect of the present invention provides a heating device, which comprises the electric heating film described in any one of the above items.

[0015] The present invention provides an electric heating film, a manufacturing method and a heating device. The electric heating film in the present invention includes a carrier body and an electric heating layer arranged on the carrier body. The carrier body is encapsulated between electrically insulating encapsulation layers, wherein the carrier body carrying the electric heating layer is a first thermally deformable material. During the heating process, if the electric heating film works abnormally and the temperature exceeds the thermal deformation temperature of the carrier body, the carrier body will deform, and the electric heating layer located on the carrier body includes a brittle conductive material that deforms and breaks at the same time, the entire electric heating film is disconnected, and heating stops, thereby preventing the electric heating film from catching fire due to overheating and excessive temperature, and effectively solving the safety problem of the electric heating film. Moreover, the electric heating film provided by the present invention has a simple structure, is easy to manufacture, and has low cost, which is conducive to large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front view of the structure of an electric heating film provided by one embodiment of the present invention;

[0017] Figure 2 A side view of the structure of an electric heating film provided by one embodiment of the present invention;

[0018] Figure 3 A schematic diagram of another composition structure of an electric heating film provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] See also Figure 1 and Figure 2 On the one hand, an embodiment of the present invention provides an electric heating film, including a carrier body 1, an electric heating layer 2 arranged on the carrier body 1, and an encapsulation layer 3 composited outside the carrier body 1 and the electric heating layer 2, the electric heating layer 2 includes a brittle conductive material, and the carrier body 1 is a first thermally deformable material.

[0023] The embodiment of the present invention specifically provides an electric heating film including a carrier body 1 and an electric heating layer 2 arranged on the carrier body 1, which has excellent safety performance. Among them, the electric heating layer 2 of the electric heating film is formed on the carrier body 1, and the carrier body 1 formed with the electric heating layer 2 is completely encapsulated between the encapsulation layers 3, the encapsulation layer 3 is an electrical insulating material, the carrier body 1 is a first thermal deformation material, and the electric heating layer 2 includes a brittle conductive material. During the heating process, if the electric heating film works abnormally and the temperature exceeds the thermal deformation temperature of the carrier body 1, the carrier body 1 will deform. When the deformation of the carrier body 1 exceeds the maximum deformation limit of the electric heating layer 2, the electric heating layer 2 will break, thereby causing the entire electric heating film to be short-circuited and stop heating, which effectively solves the safety performance problem of the electric heating film, and the construction is convenient and low-cost.

[0024] In the embodiment of the present invention, the carrier body 1 can be in a layered shape. When the carrier body 1 is in a layered shape, due to its wide extension surface, when the electric heating film works abnormally and the temperature exceeds the thermal deformation temperature, the deformation of the carrier body 1 is also large, which is more conducive to the electric heating layer 2 to break. Of course, the carrier body 1 can also be in other shapes, and the present invention does not limit this. The electric heating layer 2 can be set on one side of the carrier body 1, or on both sides of the carrier body 1, such as Figure 3 , and even arranged on multiple surfaces of the carrier body 1, the electric heating film with multiple electric heating layers 2 can provide more heat than ordinary electric heating films, and the range of heat radiation is wider than that of ordinary electric heating films, so that heating objects at different positions can obtain heat.

[0025] In one embodiment, the brittle conductive material includes one or more of graphene film and conductive ink. In the embodiment of the present invention, the electric heating layer 2 uses brittle conductive materials such as graphene film and conductive ink that are easily broken under external force. Graphene has two material forms, one is graphene film and the other is graphene powder. Among them, the conductive ink of the embodiment of the present invention is a mixture of graphene powder and an organic carrier, which is compounded on the carrier body 1, and then the organic carrier in the conductive ink is volatilized at a certain temperature, leaving only the graphene powder that plays a conductive and heat-generating role as the electric heating layer 2. Since graphene has the characteristics of lightness, excellent electrical and thermal conductivity, and is cheap and can be mass-produced, the brittle conductive material made of graphene as raw material also has the characteristics of lightness, excellent thermal conductivity, cheapness, and suitability for industrial production.

[0026] In one embodiment, the raw material of the first thermal deformation material includes one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone. In the embodiment of the present invention, the bearing body 1 that carries the electric heating layer 2 is selected from a material that deforms at a specific temperature, and this temperature is the maximum working temperature of the electric heating film. Among them, since the polyester resin (PET, PolyethyleneTerephthalate) made of polyethylene terephthalate as the main raw material has good mechanical properties, it can withstand an impact strength that is 3-5 times that of other films, is suitable as the bearing body 1, and is non-toxic and tasteless, and is a thermal deformation material, so PET is preferably the material of the bearing body 1. The heat resistance and mechanical properties of polyethylene naphthalate (PEN, Polyethylene Naphthalate) are better than those of polyethylene terephthalate, but the price is higher. Therefore, when a higher working temperature is required and the price is not considered, polyethylene naphthalate is preferably used as the raw material of the bearing body 1. Similarly, polyimide (PI) has better heat resistance than polyethylene naphthalate and has higher mechanical strength, and is also preferably used as the raw material of the carrier body 1. Polyetheretherketone (PEEK) has the best heat resistance among these materials, but its price is relatively high. Therefore, the most suitable raw material can be selected as the raw material of the carrier body 1 according to the actual production application. Of course, the present invention is not limited to these raw materials, and other thermal deformation materials can also be selected according to the situation.

[0027] In one embodiment, the packaging layer 3 is selected as a second thermally deformable material, the thermal deformation temperature of the second thermally deformable material is higher than the thermal deformation temperature of the first thermally deformable material, and the raw materials of the packaging layer 3 include one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone materials.

[0028] In the embodiment of the present invention, the material of the encapsulation layer 3 is selected as a second heat-deformable material whose heat deformation temperature is higher than that of the carrier body 1. In this way, if the electric heating film works abnormally during the heating process and the temperature exceeds the maximum working temperature of the bearing layer, the bearing layer will be deformed and the electric heating layer 2 will break. However, at this temperature, the deformation of the encapsulation layer 3 is small, which plays the role of oxygen isolation and insulation, and maintains the normal shape of the electric heating film. Similarly, since polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone materials have excellent heat resistance and mechanical properties, they are used as the preferred raw materials for the encapsulation layer 3. It should be noted that although the optional types of raw materials for the encapsulation layer 3 are similar to those of the carrier body 1, the heat-deformable material of the encapsulation layer 3 in the embodiment of the present invention must be selected from a material whose heat deformation temperature is higher than that of the carrier body 1.

[0029] Specifically, when the carrier body 1 uses polyethylene terephthalate as the raw material, since the heat resistance of polyethylene naphthalate, polyimide, and polyetheretherketone materials is better than that of polyethylene terephthalate, one or more of these materials can be selected as the raw material of the encapsulation layer 3, such as both layers use polyethylene naphthalate as the raw material, or one layer uses polyethylene naphthalate and the other layer uses polyimide as the raw material. When the carrier body 1 uses polyethylene naphthalate as the raw material, since polyimide and polyetheretherketone have better heat resistance, one or more of polyimide and polyetheretherketone materials can be selected as the raw material of the encapsulation layer 3; when the raw material of the carrier body 1 is polyimide, among these materials, only polyetheretherketone has better heat resistance than polyimide, so the raw material of the encapsulation layer 3 is selected from polyetheretherketone. Of course, the embodiments of the present invention are not limited to these materials, and other suitable materials can also be selected.

[0030] In one embodiment, the electric heating layer 2 includes an electrode layer 201 and a film layer 202, and the electrode layer 201 is connected to the film layer 202. In the embodiment of the present invention, the electrode layer 201 is composed of a plurality of bus bars arranged on the carrier body 1. Common materials of the bus bars are copper or silver. The bus bars are formed on the carrier body 1 by laminating the bus bars on the carrier body 1 or printing the bus bar raw materials on the carrier body 1. The present invention does not limit this formation method and the raw materials of the electrode layer 201. The film layer 202 is made of brittle conductive materials such as graphene film and conductive ink that are easily broken under external force. Graphene has two material forms, one is graphene film and the other is graphene powder. Among them, the conductive ink of the embodiment of the present invention is formed by mixing graphene powder and organic carrier, compounding on the carrier body 1, and then volatilizing the organic carrier in the conductive ink at a certain temperature, leaving only the graphene powder that plays a conductive and heat-generating role as the film layer 202.

[0031] In one embodiment, the thickness of the carrier body 1 and the encapsulation layer 3 are both 0.025 mm-1 mm. Within this thickness range, the deformation of the carrier body 1 is more suitable and the cost is lower. Of course, other suitable thicknesses can be selected according to actual conditions, and the present invention is not limited here.

[0032] On the other hand, an embodiment of the present invention provides a method for manufacturing an electric heating film, the method comprising: first, forming a carrier body 1 using a first thermally deformable material; then, forming an electric heating layer 2 on the carrier body 1 using a brittle conductive material; finally, forming a packaging layer 3 on the periphery of the carrier body 1 on which the electric heating layer 2 is formed using a second thermally deformable material.

[0033] The preparation method provided by the embodiment of the present invention can produce an electric heating film with excellent safety performance while ensuring low cost and construction convenience. Specifically, the embodiment of the present invention first forms a carrier body 1 by using a first thermal deformation material, and then forms an electric heating layer 2 on the carrier body 1 by using a brittle conductive material, such as conductive ink, graphene film, etc. The method of forming the electric heating layer 2 is selected according to the different materials selected. For example, when the brittle conductive material is conductive ink, the conductive ink is printed on the carrier body 1 by printing, and when the graphene film is used, the graphene film can only be composited to the carrier body 1 by wet transfer. In the embodiment of the present invention, the electric heating layer 2 made of brittle conductive material is attached to the carrier body 1 made of thermal deformation material, so that when the electric heating film works abnormally during the heating process and the temperature exceeds the maximum working temperature of the carrier body 1, the carrier body 1 will be deformed, causing the electric heating layer 2 to break, thereby causing the entire electric heating film to be disconnected and stop heating, thereby ensuring the safety performance of the electric heating film.

[0034] The first thermal deformation material is preferably one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone. The specific formation method adopts the existing common method. For example, when producing a polyimide film as the carrier body 1, the first step is to synthesize polyamic acid, and the second step is to form a film by imidization. The present invention does not limit the specific formation method.

[0035] In one possible embodiment, forming the electric heating layer 2 on the carrier body 1 using a brittle conductive material includes: forming a film layer 202 on the first surface of the carrier body 1 using a brittle conductive material; or, forming a film layer 202 on the first surface and the second surface of the carrier body 1 using a brittle conductive material, the second surface being located on the back of the first surface.

[0036] In the embodiment of the present invention, the film layer 202 is formed on the carrier body 1 by using a brittle conductive material. The film layer 202 can be formed on the first surface of the carrier body 1. For example, when the carrier body 1 is a layered film, the film layer 202 can be formed on one surface of the carrier layer by using a brittle conductive material; or, the film layer 202 is formed on the first and second surfaces of the carrier layer, that is, the front and back surfaces by using a brittle conductive material, wherein the brittle conductive material on the two surfaces can be the same brittle conductive material or different brittle conductive materials, and then the electrode layer 201 is formed on both surfaces by using bus bars to form an electric heating layer including the film layer 202 and the electrode layer 201, and both are covered with a packaging layer 3, so that the obtained electric heating film can meet the needs of multi-angle heating compared to the electric heating film with only one side heated. Alternatively, the carrier body 1 can be set as a frame-type body, and then the electric heating layer 2 is formed on one or both sides of the outer surface or inner surface of the carrier body 1 of the frame-type body to realize the space heating function such as an oven, a drying oven, etc., to achieve wide applicability and practicality.

[0037] In one possible implementation manner, an electric heating layer 2 is formed on a carrier body 1 using a brittle conductive material, including: compounding a conductive ink on the surface of the carrier body 1 by screen printing; drying the conductive ink printed on the carrier body 1 to form a film layer 202; or, compounding a graphene film on the carrier body 1 by wet transfer to form a film layer 202.

[0038] In the embodiment of the present invention, since the brittle conductive material includes conductive ink, that is, graphene powder, and graphene film in two forms, different methods need to be used when different forms of graphene are used to make the electric heating layer 2. When the conductive ink is used as a raw material to form the electric heating layer 2 on the carrier body 1, the conductive ink is mainly printed on the carrier body 1 by screen printing to form the electric heating layer 2, and the bus bar is also printed on the carrier body 1 by screen printing to form the electrode layer 201. As for the printing order of the conductive ink and the bus bar, there is no restriction here, which can be determined according to the specific cost requirements of the process under actual conditions. When the graphene film is used to form the electric heating layer 2, the graphene film must first be transferred to the carrier body 1 by wet transfer, and then the bus bar is printed on the same carrier layer by screen printing, and finally the encapsulation layer 3 is used to seal the graphene film and the bus bar to obtain a graphene electric heating film. The advantage of conductive ink heating film is that the process is relatively mature, and the advantage of graphene heating film is its high transparency. Graphene heating film can be selected when high transmittance is required.

[0039] Among them, the conductive ink is made of a mixture of graphene powder and an organic carrier. The conductive ink is printed on the carrier body 1 through screen printing, and then the organic carrier in the ink is volatilized at a certain temperature, and finally only the graphene powder that plays a conductive and heat-generating role is left, and a film layer 202 is formed. Common materials for busbars are copper or silver. The busbars can be formed on the carrier body 1 by laminating the busbars on the carrier body 1, or by printing the busbar raw material on the carrier body 1. The present invention does not limit this formation method. However, when copper is used as the raw material for the busbar, the copper bar with glue can be laminating on the carrier body 1, or the copper paste can be printed on the carrier body 1; and when silver is used as the raw material for the busbar, silver is generally printed on the carrier body 1. Finally, the encapsulation layer 3 is encapsulated.

[0040] In one possible implementation manner, the electric heating layer 2 is formed on the carrier body 1 by using a brittle conductive material, and further includes: forming an electrode layer 201 on the carrier body 1 by using a bus bar.

[0041] Among them, there are multiple bus bars, and the bus bars can be arranged on the film layer 202 compounded with the carrier body 1, or multiple bus bars can be directly arranged on the carrier body 1 to form an electrode layer 201, and then a brittle conductive material is used to form a film layer 202 on the carrier body 1 compounded with the electrode layer 201; as for the order of the steps of making the electrode layer 201 and the film layer 202, the film layer 202 can be formed on the carrier body 1 first, and then the bus bars are compounded to form the electrode layer 201; or the bus bars can be compounded on the carrier body 1 first to form the electrode layer 201, and then the film layer 202 is made, depending on whether the process is cheap or not.

[0042] In one embodiment, the method of forming the encapsulation layer 3 includes any one of a gluing process, a hot pressing process, and a vacuum sealing process.

[0043] In the embodiment of the present invention, the encapsulation treatment of the encapsulation layer 3 can be carried out by processes such as gluing, hot pressing and vacuum sealing, among which the gluing process is the simplest, and the encapsulation can be completed by gluing two layers of the encapsulation layers 3 with glue; the gluing method includes but is not limited to manual rolling and mechanical rolling, but the adhesive commonly used in the gluing will produce bubbles during chemical reaction during gluing, resulting in uneven surface of the bonding part, affecting the encapsulation effect, and the selection of a better adhesive can reduce the generation of small bubbles, such as: silica gel; and hot pressing is more firmly bonded than the gluing method. A binder is used during hot pressing. After the binder is applied, the encapsulation layer 3 is subjected to high-temperature hot pressing to form a relatively firmly bonded encapsulation effect; finally, the vacuum sealing method is more difficult to operate. First, the continuous multiple sides of the encapsulation layer 3 are pressed, and the last side is left. The inside of the electric heating film is evacuated to a vacuum through this unsealed side, and then the last side is sealed. If this method can be achieved, then due to the vacuum state inside it, the encapsulation effect is the best, but since the vacuum state is not easy to achieve, the best encapsulation method can be selected according to the actual situation.

[0044] In one embodiment, the adhesive used in the gluing process includes any one of silicone, acrylic, and epoxy resin adhesives. Among the adhesives used in the gluing process, acrylic and epoxy resin adhesives are prone to foaming at high temperatures, while silicone is not prone to foaming during bonding and is therefore a preferred material.

[0045] The electric heating film provided by the present invention can realize stable operation at multiple temperatures by matching the materials of the electric heating layer 2 and the materials of the encapsulation layer 3. Specifically, when a PET material with a maximum operating temperature of 120°C is selected as the raw material of the heating layer, and one or more materials of PI, PEN and PEEK with a higher maximum operating temperature are selected as the raw material of the encapsulation layer 3, the obtained electric heating film can work stably at 120°C for a long time; when a PEN material with a maximum operating temperature of 180°C is selected as the raw material of the heating layer, and one or more materials of PI or PEEK with a higher maximum operating temperature are selected as the raw material of the encapsulation layer 3, the obtained electric heating film can work stably at 180°C for a long time; when a PI material with a maximum operating temperature of 220°C is selected as the raw material of the heating layer, and a PEEK material with a higher maximum operating temperature is selected as the raw material of the encapsulation layer 3, the obtained electric heating film can work stably at 220°C for a long time. Therefore, different material combinations can be freely selected to meet various needs according to different usage requirements.

[0046] On the other hand, the present invention provides a heating device, which includes any of the above-mentioned electric heating films. In order to solve the safety performance problem of the electric heating film in the heating device while ensuring low cost and construction convenience, an embodiment of the present invention specifically provides a heating device, which includes an electric heating film including a carrier body 1 and an electric heating layer 2 arranged on the carrier body 1, and the carrier body 1 is encapsulated between electrically insulating encapsulation layers 3, wherein the carrier body 1 carrying the electric heating layer 2 is a first thermal deformation material, and during the heating process, if the electric heating film works abnormally and the temperature exceeds the thermal deformation temperature of the carrier body 1, the carrier body 1 will deform, and the electric heating layer 2 located on the carrier layer is a brittle conductive material, and when the carrier body 1 is deformed, the electric heating layer 2 will break, thereby causing the entire electric heating film to be short-circuited and stop heating, effectively solving the safety performance problem of the electric heating film, and the construction is convenient and low-cost. The present invention can be applied to civilian heating heaters, hair transplanters, industrial tunnels and dryers, etc., and has strong practicality.

[0047] Several embodiments are provided below to specifically illustrate the method for manufacturing the electric heating film.

[0048] Example 1

[0049] A conductive ink with a width of 200 mm and a length of 240 mm is printed on a 75 μm thick PEN carrier body 1 by using a screen printer, and then dried in a drying oven to form a film layer 202;

[0050] Then, a conductive silver paste with a width of 7 mm and a length of 230 mm is printed, and the silver paste electrode is also dried in a drying oven to form an electrode layer 201;

[0051] Afterwards, a small roller press is used to press the PEN film with the membrane layer 202 and the electrode layer 201 attached thereto and two 75 μm PI film encapsulation layers 3 coated with silica gel on one side.

[0052] The long-term stable working temperature of the electric heating film is 180°C. When the temperature exceeds 180°C for a long time, the electric heating film will automatically shut down and will not catch fire.

[0053] Example 2

[0054] A conductive ink with a width of 200 mm and a length of 240 mm is first printed on a 110 um thick PET carrier body 1 using a screen printer, and then dried in a drying oven to form a film layer 202;

[0055] Then, a conductive silver paste with a width of 7 mm and a length of 230 mm is printed, and the silver paste electrode is also dried in a drying oven to form an electrode layer 201;

[0056] Afterwards, a small roller press is used to press the PET film with the conductive ink and silver paste electrode attached thereto, the 75 μm PI encapsulation layer 3 and the PEN encapsulation layer 3 with acrylic glue coated on one side together.

[0057] The long-term stable working temperature of the electric heating film is 120°C. If the temperature exceeds 120°C for a long time, the electric heating film will automatically break the circuit and will not catch fire.

[0058] Example 3

[0059] A conductive ink with a width of 200 mm and a length of 240 mm is first printed on a 110 um thick PET film using a screen printer, and then dried in a drying oven to form a film layer 202;

[0060] Then, a conductive silver paste with a width of 7 mm and a length of 230 mm is printed, and the silver paste electrode is also dried in a drying oven to form an electrode layer 201;

[0061] Afterwards, a small roller press is used to press the PET film with the conductive ink layer and the silver paste electrode and two layers of 75 μm thick single-sided adhesive PEN packaging layers 3 coated with acrylic adhesive on one side together.

[0062] The long-term stable working temperature of the electric heating film is 120°C. When the temperature exceeds 120°C for a long time, the electric heating film will automatically shut down and will not catch fire.

[0063] Example 4

[0064] A conductive ink with a width of 200 mm and a length of 240 mm is first printed on a PI film with a thickness of 75 μm using a screen printer, and then dried in a drying oven to form a film layer 202;

[0065] Then, a conductive silver paste with a width of 7 mm and a length of 230 mm is printed, and the silver paste electrode is also dried in a drying oven to form an electrode layer 201;

[0066] Afterwards, a small roller press is used to press the PI film with the conductive ink layer and the silver paste electrode and two PEEK packaging layers 3 with a thickness of 100 um and coated with silicone on one side.

[0067] The long-term stable working temperature of the electric heating film is 220°C. When the temperature exceeds 220°C for a long time, the electric heating film will automatically shut down and will not catch fire.

[0068] Example 5

[0069] A graphene film with a width of 200 mm and a length of 240 mm is transferred onto the PEN carrier body 1 by wet transfer, and is dried in a drying oven to form a film layer 202;

[0070] Then, a conductive silver paste with a width of 7 mm and a length of 230 mm is printed, and the silver paste electrode is also dried in a drying oven to form an electrode layer 201;

[0071] Afterwards, a small roller press is used to press the PEN film with the graphene film and the silver paste electrode attached thereto and two layers of 75 μm PI film encapsulation layers 3 with adhesive on one side.

[0072] The long-term stable working temperature of the electric heating film is 180°C. When the temperature exceeds 180°C for a long time, the electric heating film will automatically shut down and will not catch fire.

[0073] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electric heating film, characterized in that: The invention comprises a carrier body, an electric heating layer arranged on the carrier body, and a packaging layer composited with the carrier body and the electric heating layer, wherein the carrier body is a first thermally deformable material; the carrier body is used to deform when the heating temperature of the electric heating film exceeds its thermal deformation temperature, and the electric heating layer is deformed and broken at the same time, thereby disconnecting the electric heating film and stopping heating; The encapsulation layer is selected to be a second thermally deformable material, and the thermal deformation temperature of the second thermally deformable material is higher than the thermal deformation temperature of the first thermally deformable material; The electric heating layer includes an electrode layer and a film layer, wherein the electrode layer is connected to the film layer; the film layer is a brittle conductive material such as a graphene film or conductive ink that is easily broken under external force; The raw material of the first thermal deformation material includes one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone; The raw material of the encapsulation layer includes one or more of polyethylene terephthalate, polyethylene naphthalate, polyimide, and polyetheretherketone.

2. The method for manufacturing the electric heating film according to claim 1, characterized in that: The method comprises: Using the first thermally deformable material to form a load-bearing body; forming an electric heating layer on the carrier body by using a brittle conductive material; A packaging layer is formed by using a second thermally deformable material on the outer periphery of the carrier body formed with the electric heating layer.

3. The method according to claim 2, characterized in that The method of forming an electric heating layer on the carrier body by using a brittle conductive material comprises: Using a brittle conductive material to form a film layer on the first surface of the carrier body; or, A film layer is formed on the first surface and the second surface of the carrier body by using a brittle conductive material, wherein the second surface is located on the back side of the first surface.

4. The method according to claim 2, characterized in that: The method of forming an electric heating layer on the carrier body by using a brittle conductive material comprises: Compounding the conductive ink on the surface of the carrier body by screen printing; Drying the conductive ink printed on the carrier to form a film layer; or, The graphene film is compounded on the carrier body by wet transfer to form a film layer.

5. The method according to claim 2, characterized in that: The electric heating layer is formed on the carrier body by using a brittle conductive material, and further comprises: An electrode layer is formed on the carrier body by using a bus bar.

6. A heating device, comprising the electric heating film according to claim 1.

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