Flexible high-temperature heating element, heating film and heater
By using van der Waals forces to connect the electrodes in the flexible heating film, the problem of weak electrode connection under high temperature conditions is solved, and the stability and conductivity of the electrodes are maintained at high temperatures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-03-10
AI Technical Summary
Existing flexible heating films have weak electrode connections under high-temperature environments, leading to the failure of conductive agents and affecting product quality.
The electrodes are connected by van der Waals forces. First and second superconductors are placed at the electrode positions, and a weakly viscous conductive agent is filled between them. The electrodes are fixed by van der Waals forces and connected to the lead wire by a thick conductive foil.
Maintaining the stability of electrode connections in high-temperature environments avoids the problem of existing conductive agents failing at high temperatures and ensures conductivity.
Smart Images
Figure CN223987185U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric heating technical field, concretely relates to a flexible high temperature heating element, heating film and heating ware. BACKGROUND
[0002] The flexible heating film is composed of the planar heating element of the electric insulating material and the heating material encapsulated in it.
[0003] In order to guarantee its flexibility and foldable characteristics, the electrode also must be thin, generally ≤10um; the module made is good in flexibility and foldable, in the preparation process, since the electrode and the heating element are combined with different materials, generally effective connection is carried out using high-temperature resistant conductive agent, and when the working temperature of the heating element is greater than 200 degrees Celsius, the high-temperature resistant conductive agent on the market will fail, leading to electrode separation or falling off, thereby affecting product quality. SUMMARY
[0004] The utility model wants to solve the technical problem to provide a flexible high temperature heating element, heating film and heating ware, can effectively the thin conductive body is effectively fixed, guarantees the connection availability under high temperature working environment.
[0005] In order to solve the above technical problem, the utility model provides a flexible high temperature heating element, including heating body, the electrode position of heating body is provided with first superconductor, weak adhesion conductive agent and second superconductor, weak adhesion conductive agent is arranged between first superconductor and second superconductor and fills surface gap, first superconductor and second superconductor are combined into an organic whole through van der waals force, and the thickness of second superconductor is ≤10um.
[0006] Further, the first superconductor is a solidified silver paste layer, the second superconductor is a thin conductive foil, and the weak adhesion conductive agent is silver paste.
[0007] Further, the number of the heating body is at least 2, an auxiliary extension section is arranged on the second superconductor corresponding to each of the two adjacent heating bodies, the two auxiliary extension sections are stacked and arranged with the weak adhesion conductive agent therebetween, and the two auxiliary extension sections are combined into an organic whole through van der waals force.
[0008] Furthermore, a thick conductive foil is overlapped on the surface of the second superconductor, and a third superconductor is coated on the surface of the thick conductive foil at the overlap. The third superconductor is also a thin conductive foil. A weakly adhesive conductive agent is provided between the thick conductive foil and the second and third superconductors, as well as between the third superconductor and the second superconductor. The second and third superconductors, the thick conductive foil and the second superconductor, and the thick conductive foil and the third superconductor are bonded together by van der Waals forces. The thick conductive foil is used to connect to the lead wire.
[0009] Furthermore, an auxiliary extension section is provided on the second superconductor, and a thick conductive foil is overlapped on the auxiliary extension section. A third superconductor is covered on the surface of the thick conductive foil at the overlap. The third superconductor is also a thin conductive foil. A weakly adhesive conductive agent is provided between the thick conductive foil and the auxiliary extension section and the third superconductor, as well as between the third superconductor and the auxiliary extension section. The auxiliary extension section and the third superconductor, the thick conductive foil and the auxiliary extension section, and the thick conductive foil and the third superconductor are bonded together by van der Waals forces. The thick conductive foil is used to connect to the lead wire.
[0010] Furthermore, it also includes a thick conductive foil, which extends between the first superconductor and the second superconductor. A weakly adhesive conductive agent is disposed between the thick conductive foil and the second superconductor and the first superconductor. The thick conductive foil is bonded to the second superconductor and the first superconductor by van der Waals forces. The thick conductive foil is used to connect to the lead wire.
[0011] Furthermore, the thin conductive foil is made of silver foil or copper foil.
[0012] Furthermore, the thickness of the thick conductive foil is 15um-30um, and the material is silver foil or copper foil.
[0013] A flexible high-temperature heating film includes two insulating films, with a flexible high-temperature heating element as described above disposed between the two insulating films, and at least one of the two insulating films having an adhesive disposed thereon.
[0014] A heating element comprising the aforementioned flexible high-temperature heating film.
[0015] The beneficial effects of this utility model are:
[0016] After adding a weakly viscous silver paste between the first and second superconductors, van der Waals forces are effectively formed between them, which have reliable strength. This application uses van der Waals forces as the connection of electrode components, instead of relying on the adhesive force of silver paste, thereby effectively avoiding the problem of weak connection of low-viscosity silver paste in the layer structure, as well as the problem of connection failure of existing high-temperature conductive adhesives in working environments above 200 degrees Celsius. Furthermore, the addition of silver paste can effectively ensure its conductivity. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the layer structure of Embodiment 1 of this utility model;
[0018] Figure 2 This is a schematic diagram of the layer structure of Embodiment 2 of this utility model;
[0019] Figure 3 This is a schematic diagram of the layer structure of Embodiment 3 of this utility model;
[0020] Figure 4 This is a schematic diagram of the layer structure of Embodiment 4 of this utility model;
[0021] Figure 5 This is a schematic diagram of the layer structure of Embodiment 5 of this utility model;
[0022] Figure 6 This is an exploded view of the overall structure of the flexible high-temperature heating film of this utility model;
[0023] Figure 7 This is a utility model Figure 6 A frontal view of the structure. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.
[0025] Example 1
[0026] Reference Figure 1 As shown, one embodiment of a flexible high-temperature heating element includes a heating body 1. A first superconductor 2, a weakly viscous conductive agent 3, and a second superconductor 4 are disposed at the electrode positions of the heating body. The weakly viscous conductive agent is disposed between the first superconductor and the second superconductor to fill the surface gap. The first superconductor and the second superconductor are bonded together by van der Waals forces. The thickness of the second superconductor is ≤10µm.
[0027] Specifically, the first superconductor is a cured silver paste layer, the second superconductor is a thin conductive foil, the weakly viscous conductive agent is silver paste, and the thin conductive foil is made of silver foil or copper foil.
[0028] During manufacturing, a layer of silver paste is first printed at the electrode positions of the heating element. The heating element and the silver paste evaporate the solvent at temperatures above 100 degrees Celsius and sinter together to form a dried silver paste layer. Then, silver paste is printed on the surface of the silver paste layer or the back of the thin conductive foil, and the thin conductive foil is attached to the silver paste layer. The width of the silver paste layer is greater than the width of the thin conductive foil, and the width of the printed silver paste is less than or equal to the size of the thin conductive foil. The entire assembly is then placed in a press for hot pressing. During the hot pressing process, the silver paste fills the gaps between the silver paste layer and the surface of the thin conductive foil and removes air, thus allowing the silver paste layer and the thin conductive foil to be firmly fixed together under the action of van der Waals forces.
[0029] Example 2
[0030] Based on the structure of Embodiment 1, referring to Figure 2 As shown, in this embodiment, the number of heating bodies is at least 2. Each of the two adjacent heating bodies is provided with an auxiliary extension section 5 on its corresponding second superconductor. The two auxiliary extension sections are stacked and a weakly viscous conductive agent is provided between them. The two auxiliary extension sections are bonded together by van der Waals forces.
[0031] When heating elements are used in a series-parallel configuration, their electrodes can be effectively connected to form a conductive effect. Therefore, to improve the effective connection between the two thin conductive foils, van der Waals forces are employed. Specifically, during manufacturing, a layer of silver paste is first printed at the electrode positions of both heating elements. The heating elements and silver paste are then cooled to above 100 degrees Celsius to evaporate the solvent and sinter together, forming a dried silver paste layer. Subsequently, silver paste is printed on the surface of the silver paste layer or the back of the thin conductive foil, and the thin conductive foil is adhered to the silver paste layer. The entire assembly is then placed in a press for hot pressing. After the two heating elements are prepared, silver paste is printed on the surface of one of the auxiliary extension sections, and then hot pressing is performed again to complete the connection. Alternatively, during the first hot pressing, silver paste can be printed on the surface of one of the auxiliary extension sections simultaneously, completing the overall connection in one step.
[0032] Example 3
[0033] Based on the structure of Embodiment 1, referring to Figure 3 As shown, in this embodiment, a thick conductive foil 6 is overlapped on the surface of the second superconductor. A third superconductor 7 is wrapped around the surface of the thick conductive foil at the overlap. The third superconductor is also a thin conductive foil. A weakly adhesive conductive agent is provided between the thick conductive foil and the second and third superconductors, as well as between the third superconductor and the second superconductor. The second and third superconductors, the thick conductive foil and the second superconductor, and the thick conductive foil and the third superconductor are bonded together by van der Waals forces. The thick conductive foil is used to connect to the lead wire. The thickness of the thick conductive foil is 15um-30um, and the material is silver foil or copper foil.
[0034] When the electrodes are in use, they need to be led out and connected to the power supply via leads. However, it is very difficult to connect the thin conductive foil directly to the leads, as there are problems such as insufficient connection strength and easy breakage. Therefore, by leading out the thick conductive foil, the conductive foil is connected to the leads, thereby compensating for the problems of connection strength and breakage.
[0035] In the fabrication process, a layer of silver paste is first printed at the electrode positions of the heating element. The heating element and the silver paste are then evaporated at temperatures above 100 degrees Celsius to evaporate the solvent and sinter together, forming a dried silver paste layer. Subsequently, silver paste is printed on the surface of the silver paste layer, the two sides of the overlap between the thick conductive foil and the thin conductive foil, and the back of the thin conductive foil. After printing, these layers are stacked together sequentially, and then the entire assembly is placed in a press for hot pressing to obtain an effectively connected structure. The extended portion of the thick conductive foil and the lead wire can be fixed by welding, riveting, or other methods, thus preventing connection failure.
[0036] Example 4
[0037] Based on the structure of Embodiment 1, referring to Figure 4 As shown, in this embodiment, an auxiliary extension section 5 is provided on the second superconductor, and a thick conductive foil 6 is overlapped on the auxiliary extension section. A third superconductor 7 is covered on the surface of the thick conductive foil at the overlap. The third superconductor is also a thin conductive foil. A weakly adhesive conductive agent is provided between the thick conductive foil and the auxiliary extension section and the third superconductor, as well as between the third superconductor and the auxiliary extension section. The auxiliary extension section and the third superconductor, the thick conductive foil and the auxiliary extension section, and the thick conductive foil and the third superconductor are bonded together by van der Waals forces. The thick conductive foil is used to connect with the lead wire. The thickness of the thick conductive foil is 15um-30um, and the material is silver foil or copper foil.
[0038] Compared with Embodiment 3, this embodiment also provides an epitaxial method for increasing the thickness of the conductive foil. When the thick conductive foil is placed between the silver paste layer and the thin conductive foil, it will cause a local increase in thickness. Although it does not affect the use, in order to improve the quality, the thin conductive foil is extended, that is, it is connected to the thick conductive foil on the auxiliary extension section to form an effective fixation, and then connected by the lead wire.
[0039] During preparation, a layer of silver paste is first printed at the electrode position of the heating body. The heating body and the silver paste evaporate the solvent at a temperature above 100 degrees and sinter together to form a dried silver paste layer. Then, silver paste is printed on any surface between the silver paste layer, the thick conductive thin layer, and the auxiliary extension section. After printing, they are stacked together and then the whole is placed in a press for hot pressing to obtain an effectively connected structure.
[0040] Example 5
[0041] Based on the structure of Embodiment 1, referring to Figure 5As shown, this embodiment also includes a thick conductive foil 6. A portion of the thick conductive foil extends between the first superconductor and the second superconductor. A weakly adhesive conductive agent is disposed between the thick conductive foil and both the second and first superconductors. The thick conductive foil is bonded to the second superconductor and to the first superconductor by van der Waals forces. The thick conductive foil is used to connect to the lead wire. The thickness of the thick conductive foil is 15µm-30µm, and the material is silver foil or copper foil.
[0042] In this embodiment, a method for setting a thick conductive foil is also provided, which is placed directly between the silver paste layer and the thin conductive foil, and can also effectively connect the thick conductive foil.
[0043] Example 6
[0044] Reference Figure 6 and Figure 7 Furthermore, a flexible high-temperature heating film is provided, employing a flexible high-temperature heating element based on Example 3. This includes two insulating films 8, with the aforementioned flexible high-temperature heating element disposed between the two insulating films. At least one of the insulating films has an adhesive layer disposed on it. The insulating films are flexible PI films or aramid films. An adhesive layer can be disposed on the surface of the insulating films for encapsulation and bonding. The adhesive layer can be directly disposed on the surface of the insulating films to form an adhesive structure, or a separate adhesive layer (film) can be used for auxiliary encapsulation. The adhesive layer uses high-temperature resistant PI adhesive or epoxy adhesive. In the flexible high-temperature heating element, the heating body is made of PI graphene or aramid graphene film. Electrodes are disposed on the heating body, with two electrodes in total. Each electrode includes a silver paste layer, silver paste, a thin conductive foil, silver paste, a thick conductive foil, silver paste, and a thin conductive foil stacked sequentially. These layers are pressed together by a press to generate van der Waals forces, thereby firmly bonding them together. After pressing, the air and some silver paste between adjacent layers are expelled. The remaining silver paste can fill the gaps between adjacent layers, ensuring a larger contact area between the layers, improving conductivity, and also greatly enhancing the van der Waals forces between the layers.
[0045] The insulating film corresponding to the lead wire 9 is provided with lead hole 10, and the lead hole is fixed by insulating glue 11.
[0046] During preparation, two layers of insulating film are first cut according to the design dimensions. The outer dimensions of the insulating film are 15mm larger on each side than the dimensions of the heating body. The second and third superconductors are both made of thin copper foil with a width of 12mm and a thickness of 6um. The thick conductive foil is made of thick conductive foil with a width of 10mm and a thickness of 20um. The silver paste is made of high-temperature resistant silver paste, and the adhesive film is made of PI adhesive. The silver paste layer is also prepared using the above-mentioned high-temperature resistant silver paste.
[0047] After the materials are prepared, silver paste is printed on the electrode positions at both ends of the heating body. The heating body and the silver paste evaporate the solvent at a temperature above 100 degrees and sinter together to form a dried silver paste layer. The heating area of the heating body is then slotted out in a staggered manner.
[0048] Subsequently, the insulating film, the heating body with the dried silver paste layer, the second superconductor, the thick conductive foil, the third superconductor, and the insulating film (with adhesive) are positioned and assembled together to obtain the assembled structure. Silver paste is printed between the dried silver paste layer and the second superconductor, between the second superconductor and the thick conductive foil, and between the thick conductive foil and the third superconductor, which can play a preliminary bonding and positioning role.
[0049] The assembled structure is placed on a high-temperature press platform. Under the pressure of the high-temperature press, the air is expelled, and the adhesive-coated insulating film and the heating body are bonded together. Van der Waals forces are generated between the various structural layers under hot pressing. The adhesive-coated insulating film is also bonded to the second and third superconductors. The periphery of the non-heating area of the non-adhesive insulating film, the non-overlapping positions on the thick conductive foil, and the periphery of the adhesive-coated insulating film are pressed together. (The overall size of the heating film is smaller than that of the insulating film.) The pressing temperature is above 200 degrees Celsius, and the time is not less than 1 minute.
[0050] Then, the mounting holes are punched out and an insulating layer is attached around the heating film to strengthen its strength. Lead wires are then welded in, and insulating glue is used to seal and fix the position after welding. Once the heating film is completed and passes inspection, it can be put into storage.
[0051] In the above structure, the non-overlapping position of the thick conductive foil serves as the connection point for the lead wire. During the welding process, it does not come into contact with the thin copper foil. The thick conductive foil as a whole has good strength, ensuring the firmness of the weld. If riveting is used, the non-overlapping position, with its good inherent strength, avoids the problem of delamination due to uncontrollable riveting force, thus effectively improving the connection quality. Furthermore, during use, the pulling force of the lead wire is transmitted from the extension to the connection point between the thick conductive foil and the thin copper foil, rather than acting directly, thus meeting the usage requirements.
[0052] At the overlap of the thick conductive foil and the thin conductive foil, a conductive part can be provided. The conductive part can be a through hole or a strip groove, etc. It can reduce the surface size of the thick conductive foil, and the silver paste extends to the other side through the conductive part. The silver paste in the conductive part can form a convex structure, which can improve the connection strength between the thick conductive foil and the second and third superconductors, and also provide a limiting effect in the horizontal direction of the surface.
[0053] The aforementioned third superconductor can also be a carbon nanotube film, which can also improve the bonding strength. Alternatively, the third superconductor can be designed as a two-layer structure, using a thin copper foil and a carbon nanotube film stacked together. The carbon nanotube film is located on one side of the thick conductive foil, placed within the silver paste between the copper foil and the thick conductive foil, to improve the toughness and strength of the thickened section.
[0054] In addition, carbon nanotube membranes can also be placed inside the silver paste layer. When carbon nanotube membranes are present, they can improve toughness and strength and greatly reduce the cracking problem of the silver paste layer. They can also play a conductive connection role after the silver paste layer cracks, ensuring the integrity of the overall structural pathway and further improving product quality.
[0055] In the above embodiments, the silver paste provides a relatively weak adhesive force. Before being pressed by a press, the silver paste can initially fix the relative positions between the multilayer structures, thereby improving the overall positional accuracy.
[0056] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.
Claims
1. A flexible high temperature heat generating element, characterized in that, The flexible high-temperature heating element comprises a heating body, a first superconductor, a weakly adhesive conductive agent and a second superconductor arranged at the electrode position of the heating body, the weakly adhesive conductive agent is arranged between the first superconductor and the second superconductor to fill the surface gap, the first superconductor and the second superconductor are integrated by Van der Waals force, and the thickness of the second superconductor is less than or equal to 10 um.
2. The flexible high temperature heat generating element of claim 1, wherein, The first superconductor is a solidified silver paste layer, the second superconductor is a thin conductive foil, and the weakly adhesive conductive agent is silver paste.
3. The flexible high temperature heat generating element of claim 2, wherein, The number of the heating bodies is at least two, auxiliary extension sections are arranged on the second superconductors corresponding to adjacent two heating bodies, the two auxiliary extension sections are arranged in a stacked mode and are arranged with the weakly adhesive conductive agent therebetween, and the two auxiliary extension sections are integrated by Van der Waals force.
4. The flexible high temperature heat generating element of claim 2, wherein, A thick conductive foil is arranged on the surface of the second superconductor in a lap joint mode, a third superconductor is arranged on the surface of the thick conductive foil at the lap joint position, the third superconductor is also a thin conductive foil, the weakly adhesive conductive agent is arranged between the thick conductive foil and the second superconductor and between the third superconductor and the second superconductor, the second superconductor and the third superconductor, the thick conductive foil and the second superconductor and the thick conductive foil and the third superconductor are integrated by Van der Waals force, and the thick conductive foil is used for being connected with a lead wire.
5. The flexible high temperature heat generating element of claim 2, wherein, An auxiliary extension section is arranged on the second superconductor, a thick conductive foil is arranged on the auxiliary extension section in a lap joint mode, a third superconductor is arranged on the surface of the thick conductive foil at the lap joint position, the third superconductor is also a thin conductive foil, the weakly adhesive conductive agent is arranged between the thick conductive foil and the auxiliary extension section and between the third superconductor and the auxiliary extension section, the auxiliary extension section and the third superconductor, the thick conductive foil and the auxiliary extension section and the thick conductive foil and the third superconductor are integrated by Van der Waals force, and the thick conductive foil is used for being connected with a lead wire.
6. The flexible high temperature heat generating element of claim 2, wherein, A thick conductive foil is arranged on the surface of the second superconductor in a lap joint mode, a third superconductor is arranged on the surface of the thick conductive foil at the lap joint position, the third superconductor is also a thin conductive foil, the weakly adhesive conductive agent is arranged between the thick conductive foil and the second superconductor and between the third superconductor and the second superconductor, the second superconductor and the third superconductor, the thick conductive foil and the second superconductor and the thick conductive foil and the third superconductor are integrated by Van der Waals force, and the thick conductive foil is used for being connected with a lead wire.
7. The flexible high-temperature heating element according to any one of claims 2-6, characterized in that, The material of the thin conductive foil is silver foil or copper foil.
8. The flexible high-temperature heating element according to any one of claims 4-6, characterized in that, The thickness of the thick conductive foil is 15 um-30 um, and the material of the thick conductive foil is silver foil or copper foil.
9. A flexible high temperature heat generating film, characterized by, The flexible high-temperature heating film comprises two layers of insulating films, the two layers of insulating films are arranged with the flexible high-temperature heating element according to any one of claims 1-6, and at least one of the two layers of insulating films is arranged with a colloid.
10. A heat generator, characterized by The flexible high-temperature heating film comprises the flexible high-temperature heating element according to claim 9.