CN209897295U

CN209897295U - Electrothermal film

Info

Publication number: CN209897295U
Application number: CN201920093056.4U
Authority: CN
Inventors: 袁凯; 刘海滨; 谭化兵
Original assignee: Wuxi Sixth Element Electronic Film Technology Co Ltd
Current assignee: Changzhou sixth element Semiconductor Co.,Ltd.
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2020-01-03
Anticipated expiration: 2029-01-21

Abstract

The utility model provides an electrothermal film, which comprises a heating body layer, a first electrode end and a second electrode end; the first electrode end and the second electrode end are respectively provided with a first connecting terminal and a second connecting terminal, and the first connecting terminal and the second connecting terminal are positioned on the same side of the heating body layer; and the packaging layer comprises a first packaging layer and a second packaging layer, and the first heating body layer, the first connecting terminal and the second connecting terminal are packaged in the packaging layer. The utility model provides an electric heat membrane heat energy conversion rate is high to possess the performance of flexible and resistant washing simultaneously.

Description

Electrothermal film

Technical Field

The utility model relates to a flexible water-fast electric heat membrane that washes belongs to the electric heat membrane field.

Background

The existing high-temperature electric heating film heating body is a circuit formed by etching metal foil, and the emissivity of the metal foil is low, so that the electric heating radiation efficiency is low, and the requirement of an electric heating device with high electric heating radiation efficiency cannot be met. Emissivity is the ratio of the radiation power of an object to the radiation power of a black body at the same temperature, and is also referred to as emissivity, which characterizes the radiation power of the object to light.

The electric heating radiation conversion efficiency of the existing metal foil electric heating film is below 20%.

The metal foil electric heating film mainly comprises the following manufacturing steps: 1) covering a metal film on the insulating film; 2) covering a photosensitive film on the metal foil; 3) patterning the photosensitive film by exposure and development; 4) putting the metal foil into an etching solution to etch an unprotected area; 5) and removing the photosensitive film in the film removing solution, and covering a layer of insulating film on the metal foil. The steps of the process are complex, and the use of the metal foil etching solution and the stripping solution can cause environmental pollution.

Patent (CN104883760A) of wuxi gefei electronic thin film technology limited discloses an electric heating sheet using graphene thin film as a heating body, and graphene as a heating body is prone to generate uneven heat, because the thickness of the graphene thin film is too thin (approximately equal to 0.35nm), the graphene thin film is prone to damage during preparation and processing, and the sheet resistance of graphene is uneven, which is also prone to cause uneven heat generation; in addition, since graphene is too thin, it is easily burned out during large current operation, and thus it is difficult to realize high temperature heating. Meanwhile, the whole flexibility is poor, and the application range is narrow.

Another patent (CN106304428A) of wuxigefei electronic thin film patent limited company adopts a graphite film as a heating element to manufacture a high-temperature electrothermal film, which has a simple process, but has poor corresponding softness due to the adoption of plastic for packaging.

Based on the above problems, in the field of electric heating films, further exploration is still urgently needed about the softness, the water washing resistance degree and the simplification degree of the process of the electric heating film.

The statements in the background section are merely technical equivalents which may be known to a person skilled in the art and do not, of course, represent prior art in this field.

SUMMERY OF THE UTILITY MODEL

To one or more among the prior art problem, the utility model provides an electrothermal film, include:

a heat generating body layer including a first electrode terminal and a second electrode terminal;

the first electrode end and the second electrode end are respectively provided with a first connecting terminal and a second connecting terminal, and the first connecting terminal and the second connecting terminal are positioned on the same side of the heating body layer;

and the packaging layer comprises a first packaging layer and a second packaging layer, and the heating body layer, the first connecting terminal and the second connecting terminal are packaged in the packaging layer.

According to an aspect of the utility model, the electric heat membrane still includes the viscose layer, the viscose layer includes first viscose layer and second viscose layer, first viscose layer set up in generate heat the body layer with first connecting terminal and second connecting terminal's surface with between the first encapsulated layer, the second viscose layer sets up generate heat the body layer with between the second encapsulated layer.

According to an aspect of the utility model, first viscose layer with second viscose layer is ya keli double faced adhesive tape, silica gel double faced adhesive tape, EVA hot melt adhesive, TPU hot melt adhesive or PES hot melt adhesive.

Preferably, the first adhesive layer and the second adhesive layer are both TPU hot melt adhesives.

The TPU hot melt adhesive has the characteristics of excellent high tension, toughness and aging resistance, has the performances of wide hardness range, high mechanical strength, high temperature resistance and the like, and is suitable for being attached to various fabrics.

According to an aspect of the utility model, the thickness on first viscose layer with the second viscose layer is 0.001-1.0 mm.

Preferably, the thickness of the first adhesive layer and the second adhesive layer is 0.02 mm.

In order to reduce the overall thickness of the heating film and improve the flexibility, the thinnest glue is used for the adhesive layer as much as possible, and the thinnest thickness of the TPU hot melt adhesive can reach 0.02 mm.

According to an aspect of the utility model, the electric heat membrane still includes the reflection stratum, the reflection stratum sets up the surface of first encapsulated layer or the surface of second encapsulated layer.

According to an aspect of the invention, the reflective layer is a patterned reflective layer.

Preferably, the material of the reflecting layer is a metal conductive material.

Further preferably, the material of the reflective layer is a pure metal conductive material or a mixed type conductive material.

According to one aspect of the present invention, the pure metal conductive material is a copper foil, a gold foil, or a silver foil.

According to an aspect of the utility model, the mixed type conducting material is one or the combination more than two of silver glue, silver thick liquid, copper thick liquid or carbon thick liquid.

Set up the reflection stratum at the surface of encapsulated layer, when the human body used the electric heat membrane, the reflection stratum can be with the heat reflection of outdiffusion to the human body, ensures that the whole directional radiation of heat energy is to the human body, can also effectively reduce the thickness of electric heat membrane, greatly simplifies electric heat membrane equipment process flow simultaneously.

According to an aspect of the utility model, the heating element layer adopts graphite heat conduction membrane.

Preferably, the graphite film comprises a PI sintered graphite film, a natural graphite film and a graphene coating film.

Further preferably, the heat generating body layer is a PI sintered graphite film.

The PI sintered graphite film refers to a graphite film formed by high-temperature calcination and graphitization under certain pressure. The PI sintered graphite film has better flexibility, and is more suitable for the requirements of heating film flexibility and water washing resistance than other graphite films.

The graphene coating film is a composite film formed by coating graphite on the surface of graphene and coating the graphene with the graphite.

According to an aspect of the present invention, the heat-generating body layer is a patterned graphite film.

Preferably, the pattern is of an end-to-end U-shaped configuration.

According to the utility model discloses an aspect, the both ends of end to end's U type structure are first electrode end and second electrode end respectively, first electrode end with second electrode end symmetry.

Preferably, the U-shaped structure connected end to end comprises a plurality of vertical strip parts and a plurality of bending parts which are parallel.

Further preferably, the vertical bar portions have the same width, and the distances between the adjacent vertical bar portions are the same.

According to an aspect of the present invention, the bending portion is curved in an arc shape or bent at a right angle.

Preferably, the bending part is a right-angle bending.

According to an aspect of the present invention, the width of the bent portion is wider than the width of the vertical bar portion.

According to one aspect of the invention, the width of the bending part is 2-5 times of the vertical strip part.

Preferably, the width of the bending part is 3 times of that of the vertical strip part.

The position of the portion of bending is often in the border position of electric heat membrane, and the force that can receive at the in-process of using or even washing is more complicated than electric heat membrane non-border position, and the width of the portion of bending is thick along the vertical bar relatively, makes the portion of bending be difficult to damage, promotes the wholeness ability of electric heat membrane, prolongs the life of electric heat membrane.

According to an aspect of the present invention, the first electrode terminal and the second electrode terminal are disposed in opposite directions, and the distance between the first electrode terminal and the second electrode terminal is 1-1000 mm.

Preferably, the distance between the first electrode terminal and the second electrode terminal is 20 mm.

The distance between the first electrode end and the second electrode end is set to facilitate the connection with a power supply, and if the distance is too far, the connection with the power supply is inconvenient; if the distance is too close, a short circuit is easily generated.

According to an aspect of the present invention, the thickness of the heat generating body layer is not less than 10 μm.

Preferably, the thickness of the heat generating body layer is 20 to 100 μm.

Further preferably, the thickness of the heat generating body layer is 25 μm.

According to an aspect of the present invention, the thickness of the first connecting terminal and the second connecting terminal is 0.001-0.5 mm.

Preferably, the first connection terminal and the second connection terminal each have a thickness of 0.018 mm.

According to an aspect of the present invention, the area of the first connection terminal is greater than or equal to the area of the first electrode terminal, and the area of the second connection terminal is greater than or equal to the area of the second electrode terminal.

If the area of connecting terminal is less than the area of electrode end, connecting terminal can not cover the electrode end completely, can produce the segment difference between connecting terminal and the electrode end then, connecting terminal except having electrically conductive function, still possess the function of protection electrode end, the electrode end is connected with the power, damage easily at the in-process of washing many times, connecting terminal covers the electrode end, make the electrode end be difficult to damage, if connecting terminal and electrode end produce the segment difference, cause the damage of electrode end easily in the place that produces the segment difference.

According to an aspect of the present invention, the first connection terminal and the second connection terminal each include a metal foil. The metal foil is copper foil, gold foil, silver foil or alloy foil combined by more than two of copper, gold or silver.

According to an aspect of the present invention, the first connection terminal and the second connection terminal each further include an insulating film, the insulating film is provided on the metal foil, and the metal foil is closely connected. Preferably, the insulating film is a PI film.

According to an aspect of the present invention, the thickness of the insulating film is 0.0125 mm.

Further preferably, the first connection terminal and the second connection terminal are non-adhesive rolled PI-attached copper films.

Because the heating element layer chooses the graphite film for use, the graphite film is itself brittle material, and heating element layer electrode end department need adopt the wire to be connected with external power supply and just can switch on and generate heat, so for guaranteeing the long-term indeterminacy of product, need add tailor-made metal connecting terminal in heating element layer electrode end department, guarantee the stability of hookup location. An insulating film is arranged on the metal connecting terminal, the insulating film adopts a PI film, the PI film is softer than metal, and the PI film is very thin, so that the effect of buffering metal foil section difference can be achieved in the manufacturing and using processes of products.

According to an aspect of the utility model, first encapsulated layer with the second encapsulated layer is flexible material, including waterproof cloth, textile fabric, knitted fabric, non-woven fabrics or waterproof silicone membrane.

According to an aspect of the present invention, the thickness of the first encapsulation layer and the second encapsulation layer is 0.005-0.5 mm.

Preferably, the thickness of the first encapsulation layer and the second encapsulation layer are both 0.005 mm.

The utility model also provides a preparation method of electric heat membrane, its step is as follows:

1) patterning the graphite film;

2) attaching the first packaging layer to the first adhesive layer, and attaching the second packaging layer to the second adhesive layer;

3) attaching the graphite film to the second adhesive layer;

4) respectively attaching a first connecting terminal and a second connecting terminal to a first electrode end and a second electrode end of the graphite film;

5) attaching the surfaces of the graphite film, the first connecting terminal and the second connecting terminal to the first adhesive layer;

6) the large sheet of graphite film material is cut into suitable small pieces of product.

According to the utility model discloses an aspect, before laminating first encapsulated layer or laminating second encapsulated layer, through modes such as front printing, impression, rendition with the integrated non-viscose face to first encapsulated layer or second encapsulated layer of metal reflecting material. The embossing mode is preferred, so that the surface is smoother and the appearance effect is better.

According to an aspect of the present invention, the first connection terminal and the second connection terminal each include a metal foil, and the metal foil is a copper foil, a gold foil, a silver foil, or an alloy foil of a combination of two or more of copper, gold, or silver.

Preferably, each of the first connection terminal and the second connection terminal further includes an insulating film disposed on the metal foil to be closely connected to the metal foil.

According to an aspect of the present invention, the first connection terminal and the second connection terminal are PI-attached copper films. Preferably, the PI copper film is fixed on the PI film by gluing or pressure welding, and the copper film is patterned by a process such as yellow light or etching, so that the unnecessary copper film is removed and the copper film can completely cover the electrode terminal.

The utility model discloses a beneficial aspect is:

the utility model discloses a graphite membrane has reduced whole thickness as heating film, has promoted the compliance of electric heat membrane, and in addition connecting terminal and cloth material packaging layer make the washing resistance performance of electric heat membrane promote, have reduced the easy torn risk of heating film simultaneously. The advantages of the present invention are explained by the following points:

(1) the cloth material is adopted to package the graphite film, so that the tearing risk of the graphite film is reduced while the flexibility of the graphite film is ensured.

(2) Need use supporting material and electrode material to generate heat with other heat-generating bodies and compare, the utility model discloses directly adopt the graphite membrane as the heat-generating body, do not need other supporting material and electrode material, the thickness of graphite membrane is very thin, and rethread cloth material collocation glues the material and directly encapsulates the graphite membrane, and whole thickness can be controlled within 0.1mm thinnest, when guaranteeing to generate heat, can make the electric heat membrane very soft, can directly imbed on any required product that generates heat as a cloth.

(3) Graphite heat conduction membrane is a very ripe material, the square resistance is low, generally be less than 0.1 omega, more be close to electric heater, but softer than electric heater, for other high square resistance heating materials, whole heating efficiency can be higher, heat up sooner, and graphite heat conduction membrane's square resistance is very even, through design and the graphite heat conduction membrane of pattern fossil, can guarantee that graphite membrane's whole resistance is at reasonable within range, thereby control current's size, prevent that graphite heat conduction membrane's current load is on the high side or on the low side.

(4) The electrode end of the graphite film is reinforced by the connecting terminal, so that the electrode end of the graphite film is not easily damaged in the process of washing for many times, and meanwhile, the electrode bonding stability of the connecting terminal and the graphite film is improved due to the fact that the metal material of the connecting terminal and the insulating material form different sections, and the risk that the graphite film is torn is reduced.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of patterning of an electrothermal film heat-generating layer according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an electrothermal film (with connecting terminals connected) according to an embodiment of the present invention;

FIG. 3 is a schematic structural view taken along section A-A of FIG. 2;

fig. 4 is a schematic structural view of a

connection terminal

21 or 22 according to an embodiment of the present invention;

FIG. 5 is a schematic structural view taken along section B-B of FIG. 4;

wherein, 1 is a heater layer, 11 is a first electrode terminal, 12 is a second electrode terminal, 2 is a connecting terminal, 21 is a first connecting terminal, 22 is a second connecting terminal, 23 is a metal foil, 24 is an insulating film, 3 is a first adhesive layer, 4 is a second adhesive layer, 5 is a first packaging layer, 6 is a second packaging layer, and a is the width of the bending part.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

According to an embodiment of the utility model, an electric heat membrane is shown, as shown in fig. 1, fig. 2 and fig. 3, the electric heat membrane includes heating element layer 1, first connection terminal 21, second connection terminal 22, first viscose layer 3, second viscose layer 4, first encapsulation layer 5 and second encapsulation layer 6, heating element layer 1 includes first electrode end 11 and second electrode end 12, first electrode end 11 and second electrode end 12 are equipped with first connection terminal 21 and second connection terminal 22 respectively, first connection terminal 21 and second connection terminal 22 are located same one side of heating element layer 1, first viscose layer 3 sets up between heating element layer 1 and first connection terminal 21 and second connection terminal 22's surface and first encapsulation layer 5, second viscose layer 4 sets up between heating element layer 1 and second encapsulation layer 6.

The first adhesive layer 3 and the second adhesive layer 4 are both acrylic double-sided adhesive tape, silica gel double-sided adhesive tape, EVA hot melt adhesive, TPU hot melt adhesive or PES hot melt adhesive. As a preferred embodiment, the first adhesive layer 3 and the second adhesive layer 4 are both TPU hot melt adhesives. The thickness of the first adhesive layer 3 and the second adhesive layer 4 is 0.001-1.0mm, for example: 0.001mm, 0.002mm, 0.003mm, 0.004mm, 0.005mm, 0.01mm, 0.015mm, 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.05mm, 0.055mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, 1.0mm, etc. In a preferred embodiment, the thickness of each of the first adhesive layer 3 and the second adhesive layer 4 is 0.02 mm.

The electric heating film further comprises a reflecting layer, and the reflecting layer is arranged on the outer surface of the first packaging layer 5 or the outer surface of the second packaging layer 6. The reflecting layer is a patterned reflecting layer, the reflecting layer is made of a metal conductive material, the metal conductive material is a pure metal conductive material or a mixed conductive material, the pure metal conductive material is a copper foil, a gold foil or a silver foil, and the mixed conductive material is one or a combination of more than two of silver adhesive, silver paste, copper paste or carbon paste.

The heating body layer 1 adopts graphite films, and the graphite films comprise a PI sintered graphite film, a natural graphite film and a graphite coating film. In a preferred embodiment, the heat generating layer 1 is a PI sintered graphite film. The PI sintered graphite film has better flexibility, and is more suitable for the requirements of heating film flexibility and water washing resistance than other graphite films. The heat-generating body layer 1 is a patterned graphite film. As shown in fig. 1, the pattern is an end-to-end U-shaped structure, two ends of the end-to-end U-shaped structure are a first electrode end 11 and a second electrode end 12, respectively, and the first electrode end 11 and the second electrode end 12 are symmetrical. The U-shaped structure connected end to end comprises a plurality of vertical bar portions and a plurality of bending portions which are parallel, the widths of the vertical bar portions are equal, the distances between the adjacent vertical bar portions are equal, the bending portions are in arc bending or right-angle bending, and as a preferred embodiment, the bending portions are in right-angle bending. As shown in fig. 1, the width a of the bent portion is wider than the width of the vertical bar portion. The width a of the bending part is 2-5 times of the vertical strip part, for example: 2 times, 3 times, 4 times, 5 times, etc. In a preferred embodiment, the width a of the bent portion is 3 times that of the vertical bar portion. The position of the portion of bending is often in the border position of electric heat membrane, and the force that can receive at the in-process of using or even washing is more complicated than electric heat membrane non-border position, and the width a of the portion of bending is thick some relatively vertical bar portion, makes the portion of bending be difficult to damage, promotes the wholeness ability of electric heat membrane, prolongs the life of electric heat membrane. The first electrode tip 11 and the second electrode tip 12 are disposed opposite to each other, and the distance between the first electrode tip 11 and the second electrode tip 12 is 1 to 1000mm, for example: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950mm, 960mm, 970mm, 980mm, 990mm, 995mm, 996mm, 997mm, 998mm, 999mm, 1000mm, and the like. As a preferred embodiment, the distance between the first electrode tip 11 and the second electrode tip 12 is 20 mm.

The thickness of the heat generating body layer 1 is not less than 10 μm. In a preferred embodiment, the thickness of the heat generating body layer 1 is 20 to 100 μm, for example: 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 95 μm, 96 μm, 97 μm, 98 μm, 99 μm, 100 μm, and the like. In a preferred embodiment, the thickness of the heat generating body layer 1 is 25 μm.

The first connection terminal 21 and the second connection terminal 22 each have a thickness of 0.001 to 0.5mm, for example: 0.001mm, 0.002mm, 0.003mm, 0.004mm, 0.005mm, 0.006mm, 0.01mm, 0.015mm, 0.018mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, etc. As a preferred embodiment, the first connection terminal 21 and the second connection terminal 22 each have a thickness of 0.018 mm. As shown in fig. 2, the area of the first connection terminal 21 is greater than or equal to the area of the first electrode terminal 11, and the area of the second connection terminal 22 is greater than or equal to the area of the second electrode terminal 12. If the area of the first connection terminal 21 is smaller than the area of the first electrode terminal 11, the area of the second connection terminal 22 is smaller than the area of the second electrode terminal 12, the first connection terminal 21 cannot completely cover the first electrode terminal 11, and the second connection terminal 22 cannot completely cover the second electrode terminal 12, a step difference may be generated between the first connection terminal 21 and the first electrode terminal 11, and between the second connection terminal 22 and the second electrode terminal 12, the first connection terminal 21 and the second connection terminal 22 have a function of protecting the first electrode terminal 11 and the second electrode terminal 12 in addition to a conductive function, the first electrode terminal 11 and the second electrode terminal 12 are connected to a power source, and are easily damaged during a plurality of times of water washing, the first connection terminal 21 covers the first electrode terminal 11, and the second connection terminal 22 covers the second electrode terminal 12, so that the first electrode terminal 11 and the second electrode terminal 12 are not easily damaged, if the first connection terminal 21 and the first electrode terminal 11 and the second connection terminal 22 and the second electrode terminal 12 have a level difference, the first electrode terminal 11 and the second electrode terminal 12 are easily damaged at the position where the level difference is generated.

Each of the first connection terminal 21 and the second connection terminal 22 includes a metal foil. The metal foil is copper foil, gold foil, silver foil or alloy foil of more than two of copper, gold or silver. Each of the first connection terminal 21 and the second connection terminal 22 further includes an insulating film, and as shown in fig. 4 and 5, the insulating film 24 is provided on the metal foil 23, is closely connected to the metal foil 23, and covers the metal foil 23. The insulating film 24 is a PI film. The thickness of the insulating film 24 was 0.0125 mm. The first connection terminal 21 and the second connection terminal 22 are non-adhesive rolled PI-attached copper films. An insulating film 24 is arranged on the metal foil 23, the insulating film 24 adopts a PI film, the PI film is softer than the metal foil 23, and the PI film is very thin, so that the effect of buffering the step difference of the metal foil 23 can be achieved in the manufacturing and using processes of products.

The first packaging layer 5 and the second packaging layer 6 are both made of flexible materials and comprise waterproof cloth, textile cloth, knitted cloth, non-woven fabric or waterproof silicone films. The thickness of the first encapsulation layer 5 and the second encapsulation layer 6 are both 0.005-0.5mm, for example: 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, etc. As a preferred embodiment, the thickness of the first and second encapsulation layers 5, 6 is 0.005mm each.

According to a second embodiment of the present invention, a method for preparing an electrothermal film according to the first embodiment is shown, as shown in fig. 1, 2 and 3, comprising the following steps:

1) patterning the graphite film 1 as shown in fig. 1;

2) attaching the first packaging layer 5 to the first adhesive layer 3, and attaching the second packaging layer 6 to the second adhesive layer 4;

3) attaching the graphite film 1 to the second adhesive layer 4;

4) attaching a first connection terminal 21 and a second connection terminal 22 to the first electrode terminal 11 and the second electrode terminal 12 of the graphite film 1, respectively, as shown in fig. 2;

5) the graphite film 1, the first connection terminal 21, and the second connection terminal 22 are bonded to the first adhesive layer 3 to form a structure shown in fig. 3;

Before the first packaging layer 5 or the second packaging layer 6 is attached, the metal reflecting material is integrated on the non-adhesive surface of the first packaging layer 5 or the second packaging layer 6 by means of whole surface printing, stamping, transfer printing and the like. In a preferred embodiment, the metal reflective material is integrated on the non-adhesive surface of the first or second sealing layer 5, 6 by means of stamping before the first or second sealing layer 5, 6 is attached.

As shown in fig. 4 and 5, each of the first connection terminal 21 and the second connection terminal 22 includes a metal foil 23, which is a copper foil, a gold foil, a silver foil, or an alloy foil of two or more of copper, gold, and silver. Each of the first connection terminal 21 and the second connection terminal 22 further includes an insulating film 24, and the insulating film 24 is provided on the metal foil 23, is closely connected to the metal foil 23, and covers the metal foil 23.

In a preferred embodiment, the first connection terminal 21 and the second connection terminal 22 are both PI-attached copper films, wherein the metal foil 23 is a copper film and the insulating film 24 is a PI film. The PI copper film is fixed on the PI film in a gluing or pressing mode, and the copper film is patterned through yellow light or etching and other processes, so that the unnecessary copper film is removed, and the copper film can completely cover the electrode end.

The present invention is more visually demonstrated by the following examples.

Example 1:

the present embodiment provides an electrothermal film, as shown in fig. 1, 2 and 3, including: the heat generating body layer 1, the first connection terminal 21, the second connection terminal 22, the first adhesive layer 3, the second adhesive layer 4, the first sealing layer 5, and the second sealing layer 6. The heating element layer 1 comprises a first electrode end 11 and a second electrode end 12, the first electrode end 11 and the second electrode end 12 are respectively provided with a first connecting terminal 21 and a second connecting terminal 22, the first connecting terminal 22 is positioned at the same side of the heating element layer 1, the first adhesive layer 3 is arranged between the surface of the heating element layer 1 and the first connecting terminal 21 and the surface of the second connecting terminal 22 and the first packaging layer 3, and the second adhesive layer 4 is arranged between the heating element layer 1 and the second packaging layer 6.

The heating body layer 1 is a graphene coating film with the thickness of 0.02mm, the first connecting terminal 21 and the second connecting terminal 22 are both copper foils with the thickness of 0.025mm, the first adhesive layer 3 and the second adhesive layer 4 are both TPU hot melt adhesives with the thickness of 0.05mm, and the first packaging layer 5 and the second packaging layer 6 are both polyester fabrics with the thickness of 0.05 mm.

Embodiment 1 also provides a preparation method of the above electrothermal film, comprising the following steps:

(1) as shown in fig. 1, a graphene coating film 1 of 0.02mm is subjected to patterning treatment according to a designed pattern, and then waste materials are removed;

(2) respectively taking 0.05mm polyester fabric as a first packaging layer 5 and a second packaging layer 6, respectively taking 0.05mm TPU hot melt adhesive as a first adhesive layer 3 and a second adhesive layer 4, and respectively attaching the polyester fabric of the first packaging layer 5 and the second packaging layer 6 with the TPU hot melt adhesive of the first adhesive layer 3 and the second adhesive layer 4;

(3) attaching the patterned graphene coating film 1 to the second adhesive layer 4;

(4) as shown in fig. 2, a first connection terminal 21 and a second connection terminal 22 are respectively attached to the first electrode terminal 11 and the second electrode terminal 12 of the graphene coated film 1, and the first connection terminal 21 and the second connection terminal 22 are both 0.025mm copper foils; the first connection terminal 21 and the second connection terminal 22 pattern the copper foil through a yellow light process, and remove the unnecessary copper foil, so that the copper foil can completely cover the first electrode terminal 11 or the second electrode terminal 12;

(5) bonding the surfaces of the graphene coating film 1, the first connection terminal 21 and the second connection terminal 22 to the first adhesive layer 3 to form a structure shown in fig. 3;

(6) cutting the large sheet of electrothermal film material into suitable small pieces.

Example 2:

The heat-generating body layer 1 is a PI sintered graphite film of 0.015mm, the first connection terminal 21 and the second connection terminal 22 are both PI copper-attached films of 0.0305mm (as shown in fig. 4 and 5), wherein the thickness of the PI film 24 is 0.0125mm, the thickness of the copper film 23 is 0.018mm, the first adhesive layer 3 and the second adhesive layer 4 are both TPU hot melt adhesives of 0.02mm, and the first encapsulating layer 5 and the second encapsulating layer 6 are both polyester fabrics of 0.05 mm.

Embodiment 2 also provides a preparation method of the above electrothermal film, including the following steps:

(1) as shown in fig. 1, a PI sintered graphite film 1 of 0.015mm is subjected to patterning treatment according to a designed pattern, and then waste materials are removed;

(2) respectively taking 0.05mm polyester fabric as a first packaging layer 5 and a second packaging layer 6, respectively taking 0.02mm TPU hot melt adhesive as a first adhesive layer 3 and a second adhesive layer 4, and respectively attaching the polyester fabric of the first packaging layer 5 and the second packaging layer 6 with the TPU hot melt adhesive of the first adhesive layer 3 and the second adhesive layer 4;

(3) bonding the patterned PI sintered graphite film 1 with the second adhesive layer 4;

(4) as shown in fig. 2, a first connection terminal 21 and a second connection terminal 22 are respectively attached to a first electrode terminal 11 and a second electrode terminal 12 of a graphene-coated graphite film 1, the first connection terminal 21 and the second connection terminal 22 are both PI-attached copper films of 0.0315mm (as shown in fig. 4 and fig. 5), wherein the thickness of the PI film 24 is 0.125mm, the thickness of the copper film 23 is 0.018mm, the first connection terminal 21 and the second connection terminal 22 are both fixed on the PI film 24 by gluing, the copper film 23 is patterned by a yellow light process, and the unnecessary copper film 23 is removed, so that the copper film 23 can completely cover the first electrode terminal 11 or the second electrode terminal 12;

(5) the surfaces of the PI sintered graphite film 1, the first connection terminal 21, and the second connection terminal 22 are bonded to the first adhesive layer 3 to form a structure shown in fig. 3;

Example 3:

The heater layer 1 is a 0.03mm natural graphite film, the first connection terminal 21 and the second connection terminal 22 are both PI copper-attached films (as shown in fig. 4 and 5) of 0.043mm, wherein the thickness of the PI film 24 is 0.025mm, the thickness of the copper film 23 is 0.018mm, the first adhesive layer 3 and the second adhesive layer 4 are both PES hot melt adhesives of 0.05mm, and the first packaging layer 5 and the second packaging layer 6 are both nylon cloth of 0.07 mm.

Embodiment 3 also provides a preparation method of the above electrothermal film, comprising the following steps:

(1) as shown in fig. 1, a 0.03mm natural graphite film 1 is subjected to patterning treatment according to a designed pattern, and then waste materials are removed;

(2) respectively taking 0.07mm nylon cloth as a first packaging layer 5 and a second packaging layer 6, respectively taking 0.05mm PES hot melt adhesive as a first adhesive layer 3 and a second adhesive layer 4, and respectively bonding the nylon cloth of the first packaging layer 5 and the second packaging layer 6 with the PES hot melt adhesive of the first adhesive layer 3 and the PES hot melt adhesive of the second adhesive layer 4;

(3) bonding the patterned natural graphite film 1 with the second adhesive layer 4;

(4) as shown in fig. 2, a first connection terminal 21 and a second connection terminal 22 are respectively attached to a first electrode terminal 11 and a second electrode terminal 12 of a natural graphite film 1, the first connection terminal 21 and the second connection terminal 22 are both PI-attached copper films with a thickness of 0.043mm (as shown in fig. 4 and fig. 5), wherein the thickness of the PI film 24 is 0.025mm, the thickness of the copper film 23 is 0.018mm, the first connection terminal 21 and the second connection terminal 22 are both fixed on the PI film 24 in a compression joint manner to the copper film 23, the copper film 23 is patterned by an etching process, and the unnecessary copper film 23 is removed, so that the copper film 23 can completely cover the first electrode terminal 11 or the second electrode terminal 12;

(5) bonding the surfaces of the natural graphite film 1, the first connection terminal 21 and the second connection terminal 22 to the first adhesive layer 3 to form a structure shown in fig. 3;

Example 4:

The PI sintered graphite film that the heating element layer 1 is 0.025mm, first connecting terminal 21 and second connecting terminal 22 are the gold foil of 0.001mm, first viscose layer 3 and second viscose layer 4 are the EVA hot melt adhesive of 0.001mm, first encapsulated layer 5 and second encapsulated layer 6 are 0.005 mm's waterproof silicone membrane.

Embodiment 4 also provides a preparation method of the above electrothermal film, comprising the following steps:

(1) as shown in fig. 1, a PI sintered graphite film 1 of 0.025mm is patterned according to a designed pattern, and then waste materials are removed;

(2) respectively taking 0.005mm waterproof silicone films as a first packaging layer 5 and a second packaging layer 6, respectively taking 0.001mm EVA hot melt adhesive as a first adhesive layer 3 and a second adhesive layer 4, and respectively attaching the waterproof silicone films of the first packaging layer 5 and the second packaging layer 6 and the EVA hot melt adhesive of the first adhesive layer 3 and the second adhesive layer 4;

(4) as shown in fig. 2, a first connection terminal 21 and a second connection terminal 22 are respectively attached to a first electrode terminal 11 and a second electrode terminal 12 of a PI sintered graphite film 1, the first connection terminal 21 and the second connection terminal 22 are both gold foils with the thickness of 0.001mm, and the gold foils are patterned by a yellow light process to remove the unnecessary gold foils, so that the gold foils can completely cover the first electrode terminal 11 or the second electrode terminal 12;

Example 5:

The heater layer 1 is a 0.1mm PI sintered graphite film, the first connecting terminal 21 and the second connecting terminal 22 are 0.5mm silver foils, the first adhesive layer 3 and the second adhesive layer 4 are 1mm silica gel double-sided adhesive tapes, and the first packaging layer 5 and the second packaging layer 6 are 0.5mm nylon cloth.

Embodiment 5 also provides a preparation method of the above electrothermal film, comprising the following steps:

(1) as shown in fig. 1, a PI sintered graphite film 1 of 0.1mm is subjected to patterning treatment according to a designed pattern, and then waste materials are removed;

(2) respectively taking 0.5mm nylon cloth as a first packaging layer 5 and a second packaging layer 6, respectively taking 1mm silica gel double faced adhesive tape as a first adhesive layer 3 and a second adhesive layer 4, and respectively attaching the nylon cloth of the first packaging layer 5 and the second packaging layer 6 and the silica gel double faced adhesive tape of the first adhesive layer 3 and the second adhesive layer 4;

(4) as shown in fig. 2, a first connection terminal 21 and a second connection terminal 22 are respectively attached to a first electrode end 11 and a second electrode end 12 of a PI sintered graphite film 1, the first connection terminal 21 and the second connection terminal 22 are both 0.5mm silver foils, and the first connection terminal 21 and the second connection terminal 22 are both patterned by an etching process to remove unnecessary silver foils, so that the electrode ends can be completely covered by the silver foils;

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrothermal film, comprising:

2. An electrothermal film according to claim 1, further comprising an adhesive layer including a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is disposed between the surface of the heat generating body layer and the first connection terminal and the second connection terminal and the first packaging layer, and the second adhesive layer is disposed between the heat generating body layer and the second packaging layer.

3. The electrothermal film of claim 2, wherein the first adhesive layer and the second adhesive layer are acrylic double-sided adhesive tape, silica gel double-sided adhesive tape, EVA hot melt adhesive, TPU hot melt adhesive or PES hot melt adhesive.

4. The electrothermal film of claim 3, wherein the first adhesive layer and the second adhesive layer are both TPU hot melt adhesives.

5. The electrothermal film of claim 2, wherein the first adhesive layer and the second adhesive layer are each 0.001-1.0mm thick.

6. An electrothermal film according to claim 5, wherein the first and second adhesive layers are both 0.02mm thick.

7. The electrothermal film of claim 1, further comprising a reflective layer disposed on an outer surface of the first encapsulation layer or an outer surface of the second encapsulation layer.

8. The electrothermal film of claim 7, wherein the reflective layer is a patterned reflective layer.

9. The electrothermal film of claim 7, wherein the reflective layer is made of a metallic conductive material.

10. The electrothermal film of claim 9, wherein the reflective layer is made of a pure metal conductive material or a hybrid conductive material.

11. The electrothermal film of claim 10, wherein the pure metal conductive material is a copper foil, a gold foil, or a silver foil.

12. The electrothermal film of claim 10, wherein the hybrid conductive material is silver paste, copper paste, or carbon paste.

13. The electrothermal film according to claim 1, wherein the heat-generating body layer is a graphite film.

14. The electrothermal film of claim 13, wherein the heat-generating layer is a patterned graphite film.

15. The electrothermal film of claim 14, wherein the pattern is an end-to-end U-shaped structure.

16. The electrothermal film of claim 15, wherein the ends of the U-shaped structure are a first electrode end and a second electrode end, respectively, and the first electrode end and the second electrode end are symmetrical.

17. The electrothermal film of claim 15, wherein the end-to-end U-shaped structure comprises a plurality of parallel vertical bars and a plurality of bends.

18. The electrothermal film of claim 17, wherein the vertical bars are of equal width and the distance between adjacent vertical bars is equal.

19. The electrothermal film of claim 17, wherein the bent portion is curved in an arc shape or a right angle.

20. The electrothermal film of claim 19, wherein the bent portion is a right angle bend.

21. The electrothermal film of claim 17, wherein the width of the bent portion is wider than the width of the vertical strip portion.

22. The electrothermal film of claim 21, wherein the width of the bent portion is 2-5 times that of the vertical strip portion.

23. The electrothermal film of claim 22, wherein the width of the bent portion is 3 times that of the vertical bar portion.

24. The electrothermal film according to claim 16, wherein the first electrode terminal and the second electrode terminal are disposed opposite to each other, and a distance between the first electrode terminal and the second electrode terminal is 1 to 1000 mm.

25. The electrothermal film of claim 24, wherein the distance between the first electrode terminal and the second electrode terminal is 20 mm.

26. The electrothermal film according to claim 1, wherein the thickness of the heat-generating body layer is not less than 10 μm.

27. The electrothermal film of claim 26, wherein the thickness of the heat-generating body layer is 20-100 μm.

28. The electrothermal film of claim 27, wherein the thickness of the heat-generating body layer is 25 μm.

29. The electrothermal film according to claim 1, wherein the first connection terminal and the second connection terminal each have a thickness of 0.001-0.5 mm.

30. An electrothermal film according to claim 29, wherein the first and second connection terminals have a thickness of 0.018 mm.

31. The electrothermal film according to claim 1, wherein the area of the first connection terminal is greater than or equal to the area of the first electrode terminal, and the area of the second connection terminal is greater than or equal to the area of the second electrode terminal.

32. The electric heating film according to claim 1, wherein the first connection terminal and the second connection terminal each comprise a metal foil.

33. The electrothermal film according to claim 32, wherein each of the first connection terminal and the second connection terminal further comprises an insulating film provided on the metal foil in close contact therewith.

34. The electrothermal film of claim 33, wherein the insulating film is a PI film.

35. An electrothermal film according to claim 33, wherein the thickness of the insulating film is 0.0125 mm.

36. The electrothermal film according to claim 1, wherein the first connection terminal and the second connection terminal are a non-adhesive rolled PI-attached copper film.

37. The electrothermal film of claim 1, wherein the first and second encapsulation layers are both flexible materials.

38. An electrothermal film according to claim 1, wherein the first and second encapsulation layers each have a thickness of 0.005-0.5 mm.

39. The electrothermal film of claim 38, wherein the first and second encapsulation layers each have a thickness of 0.005 mm.