Rigid high-temperature electric heating component

Abstract

The utility model discloses a rigid high-temperature electric heating component which comprises an upper packaging layer, a flexible electric heating layer, a lower packaging layer and a first rigid substrate which are arranged from top to bottom. And the upper packaging layer and the lower packaging layer are made of a high-temperature-resistant colloid material. According to the utility model, the packaging layer of the flexible electrothermal film is made of the high-temperature-resistant colloid material, and the flexible electrothermal film is fixed on the rigid substrate, so that the rigid high-temperature electric heating component is manufactured; the rigid high-temperature electric heating component improves the high-temperature resistance of the flexible electric heating film and prevents the flexible electric heating film from deforming, so that the high-temperature electric heating component has better heating performance at high temperature and can be suitable for a high-temperature environment.

Description

Technical Field

[0001] The utility model relates to the technical field of heating films, in particular to a rigid high-temperature electric heating component. Background Art

[0002] PI heating film, or polyimide film, is a heating film body made of polyimide film as the outer insulator and metal foil or metal wire as the inner conductive heating element, which is heat-sealed at high temperature and high pressure. PI heating film has reliable insulation strength, reliable electrical strength, reliable heat conduction efficiency, and reliable resistance stability, which makes it widely applicable to the heating field.

[0003] Existing PI heating films are generally metal etching structures, that is, metal heating elements, such as stainless steel and copper, are adhered to the PI substrate in a thin film state, and then chemically and other methods are used to etch according to the designed pattern, and finally a strip heating film with a preset resistance is obtained.

[0004] However, PI heating film is not resistant to high temperatures and is prone to deformation and uneven heating at high temperatures. Utility Model Content

[0005] In order to solve the above problems, the utility model discloses a rigid high-temperature electric heating component.

[0006] The utility model discloses a rigid high-temperature electric heating component, comprising an upper packaging layer, a flexible electric heating layer, a lower packaging layer and a first rigid substrate arranged from top to bottom;

[0007] The upper packaging layer and the lower packaging layer are made of high temperature resistant colloid material.

[0008] Preferably, the rigid high-temperature electric heating element further comprises a second rigid substrate;

[0009] The second rigid substrate is arranged on a side of the upper packaging layer away from the flexible electric heating layer.

[0010] Preferably, the material of the first rigid substrate and the second rigid substrate is any one of calcium silicate board, cement fiber board, ceramic board and rock board.

[0011] Preferably, the rigid high-temperature electric heating element further comprises a first insulating layer and a second insulating layer;

[0012] The first insulating layer is disposed between the lower packaging layer and the first rigid substrate;

[0013] The second insulating layer is disposed between the second rigid substrate and the upper packaging layer;

[0014] The first rigid substrate and the second rigid substrate are made of metal.

[0015] Preferably, the first insulating layer and the second insulating layer are made of thermoplastic polyimide.

[0016] Preferably, the high temperature resistant colloid material is any one of thermoplastic polyimide, polyimide and thermoplastic polyimide composite material.

[0017] Optionally, the upper packaging layer includes a first packaging film and a second packaging film arranged from top to bottom.

[0018] Preferably, the flexible electric heating layer comprises a conductor, a heating body and a flexible substrate arranged from top to bottom;

[0019] The heating body is arranged on the flexible substrate by means of magnetron sputtering vacuum coating, silk screen printing or spraying.

[0020] Preferably, the conductor comprises a wire, a metal foil current-carrying bar and a conductive silver paste arranged from top to bottom;

[0021] The conductive wire is connected to the metal foil bus bar;

[0022] The metal foil current-carrying bar is staggered with the conductive silver paste and is respectively bonded to the conductive silver paste and the heating body through thermoplastic polyimide.

[0023] Preferably, the conductor comprises a wire, a metal foil current-carrying bar and a conductive silver paste arranged from top to bottom;

[0024] The conductive wire is connected to the metal foil bus bar;

[0025] The metal foil current-carrying bar and the conductive silver paste are arranged in a staggered manner, and the metal foil current-carrying bar is provided with a plurality of holes along its extending direction.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] (1) The utility model sets the packaging layer of the flexible electric heating film as a high-temperature resistant colloid material, and fixes the flexible electric heating film on a rigid substrate to obtain a rigid high-temperature electric heating component; the rigid high-temperature electric heating component improves the high-temperature resistance of the flexible electric heating film and prevents the deformation of the flexible electric heating film, so the utility model has better heating performance at high temperatures;

[0028] (2) The utility model arranges the heating body on the flexible substrate by means of magnetron sputtering vacuum coating, silk screen printing or spraying to prepare a flexible electric heating layer with planar heating, which heats evenly and quickly and can effectively improve the heating speed and effect of rigid high-temperature electric heating components;

[0029] (3) The utility model punches holes on the metal foil current-carrying strip, making it easier to exhaust the air inside the flexible electric heating layer. The colloid of the sealing film can better bond and fix the metal foil current-carrying strip and the silver paste, thereby improving the adhesion between the metal foil current-carrying strip and the conductive silver paste and the heating body, thereby reducing the contact resistance. Therefore, the utility model has a higher heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the rigid high-temperature electric heating element of the utility model;

[0031] Figure 2 It is a structural diagram of a rigid high-temperature electric heating component omitting the internal structure of the flexible electric heating film;

[0032] Figure 3 This is the appearance diagram of the rigid high-temperature electric heating component of the utility model;

[0033] Figure 4 It is a structural diagram of the flexible electric heating film of the utility model;

[0034] Figure 5 It is a schematic diagram of the structure of the utility model in which a small hole is provided on a metal foil current-carrying strip;

[0035] Figure 6 This is a schematic diagram of the process for preparing a flexible electrode layer of the utility model;

[0036] Figure 7 It is a schematic diagram of the structure of the utility model in which there are no small holes on the metal foil current-carrying strip;

[0037] In the figure, 1 is the second rigid substrate; 2 is the second insulating layer; 3 is the first packaging film; 4 is the second packaging film; 5 is the wire; 6 is the metal foil current-carrying bar; 7 is the conductive silver paste; 8 is the flexible electric heating layer; 9 is the lower packaging layer; 10 is the first insulating layer; 11 is the first rigid substrate; 12 is the notch; 13 is the flexible electric heating film; 14 is the rigid high-temperature electric heating component; 15 is the small hole; 16 is the heating body; 17 is the flexible base; 18 is the PET film; 19 is the ground wire. DETAILED DESCRIPTION

[0038] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0039] like Figure 1As shown, the utility model discloses a rigid high-temperature electric heating element 14, comprising an upper packaging layer, a flexible electric heating layer 8, a lower packaging layer 9 and a first rigid substrate 11 arranged from top to bottom;

[0040] The upper encapsulation layer and the lower encapsulation layer 9 are made of high temperature resistant adhesive film material. The thickness of the adhesive layer on the surface of the adhesive film material of the upper and lower encapsulation layers is 10-20um. Optionally, the upper encapsulation layer includes a first encapsulation adhesive film 3 and a second encapsulation adhesive film 4 arranged from top to bottom. Figure 4 As shown, the upper packaging layer, the flexible electric heating layer 8 and the lower packaging layer 9 are connected in sequence to form a flexible electric heating film 13.

[0041] Preferably, the high temperature resistant adhesive film material is any one of thermoplastic polyimide, polyimide and thermoplastic polyimide composite material.

[0042] The polyimide and thermoplastic polyimide composite material is a PI adhesive film material with polyimide (PI) as the substrate and thermoplastic polyimide (TPI) adhesive coated on the surface. The PI adhesive film material is used as the upper and lower packaging layers to play the role of insulation, bonding, waterproofing and protecting the internal flexible electric heating layer 8. In other embodiments, thermoplastic polyimide can also be used alone as the colloid material of the upper and lower packaging layers.

[0043] The utility model sets the packaging layer of the flexible electric heating film 13 as a high-temperature resistant adhesive film material, and fixes the flexible electric heating film 13 on a rigid substrate to obtain a rigid high-temperature electric heating component 14; the rigid high-temperature electric heating component 14 improves the high-temperature resistance of the flexible electric heating film 13 while preventing the deformation of the flexible electric heating film 13, so the utility model has better heating performance at high temperatures.

[0044] Preferably, the flexible electric heating layer 8 comprises a conductor, a heating body 16 and a flexible substrate 17 arranged from top to bottom;

[0045] The heating body 16 is disposed on the flexible substrate 17 by means of magnetron sputtering vacuum coating.

[0046] In this embodiment, the material of the flexible substrate 17 is polyimide with a thickness of 10-150um, and the heating body 16 is prepared by a magnetron sputtering vacuum coating process, with different process formulas and material coating sequences, and a thickness of 10-200nm. In other embodiments, the magnetron sputtering vacuum coating can also be changed to screen printing or spraying.

[0047] In the utility model, the heating body 16 and the flexible substrate 17 after coating form a planar flexible electric heating layer 8, which generates heat evenly and quickly, can effectively improve the heating speed and effect of the rigid high-temperature electric heating element 14, and has the advantages of pollution-free production, environmental protection, cleanliness and greenness.

[0048] Preferably, the conductor includes a wire 5 , a metal foil bus bar 6 and a conductive silver paste 7 arranged from top to bottom.

[0049] The conductor 5 is connected to a metal foil bus bar 6 . The metal foil bus bar 6 is a metal foil, generally a copper foil, an aluminum foil, etc., and has a preset hardness, thickness and width.

[0050] The conductive silver paste 7 is prepared on the heating body 16 by printing process. It is composed of a conductive phase (mainly silver material), a bonding phase, and a reinforcing phase (organic solvent and other additives). The utility model uses a high temperature resistant resin as the bonding phase to match the use environment of the rigid high temperature electric heating component 14 product.

[0051] The material of the heating body 16 is any one of metal, a mixture of several metals, metal oxide, and a mixture of metal and metal oxide.

[0052] In one embodiment, Figure 7 As shown, the metal foil bus bar 6 and the conductive silver paste 7 are staggered and bonded to the conductive silver paste 7 and the heating body 16 respectively through thermoplastic polyimide.

[0053] In another embodiment, Figure 5 As shown, the metal foil bus bar 6 and the conductive silver paste 7 are staggered, and the metal foil bus bar 6 is provided with a plurality of holes along its extension direction, and the shape of the holes can be circular, square, polygonal, etc. The colloid of the upper packaging layer melts at high temperature and can flow through the plurality of holes onto the contact surfaces of the metal foil bus bar 6 and the conductive silver paste 7 and the heating body 16, respectively, to bond them.

[0054] In this embodiment, holes are punched on the metal foil current-carrying strip 6, and the colloid of the upper packaging layer is melted and immersed in the holes, so that the metal foil current-carrying strip 6 and the conductive silver paste 7 below are tightly bonded to form a good ohmic contact, thereby reducing the contact resistance between the metal foil and the silver paste. At the same time, the air inside the flexible electric heating layer 8 is more easily discharged, thereby improving the adhesion between the metal foil current-carrying strip 6 and the conductive silver paste 7 and the heating body 16, so that the heating efficiency of the utility model is higher.

[0055] Preferably, the rigid high temperature electric heating element 14 of the utility model further includes a second rigid substrate 1;

[0056] The second rigid substrate 1 is arranged on a side of the upper packaging layer away from the flexible electric heating layer 8. Figure 1 , Figure 3 As shown, the second rigid metal plate has a corresponding notch 12 reserved at the corresponding lead-out position of the wire 5 to facilitate the lead-out of the wire 5 .

[0057] The material of the first rigid substrate 11 and the second rigid substrate 1 can be non-metal, such as any one of calcium silicate board, cement fiber board, ceramic board, and rock board; at this time, the flexible electric heating film 13 is fixed between the first rigid substrate 11 and the second rigid substrate 1 by fixing the four corners with screws.

[0058] The first rigid substrate 11 and the second rigid substrate 1 may also be made of metal, such as aluminum plate, steel plate or other metal or alloy material, with a thickness of 0.1 to 6 mm. Since aluminum plate has the advantages of fast heat dissipation, high strength, light weight and moderate price, this embodiment uses aluminum plate as the material of the first rigid substrate 11 and the second rigid substrate 1.

[0059] When the first rigid substrate 11 and the second rigid substrate 1 are made of metal, the rigid high-temperature electric heating element 14 further includes a first insulating layer 10 and a second insulating layer 2;

[0060] The first insulating layer 10 is disposed between the lower encapsulation layer 9 and the first rigid substrate 11;

[0061] The second insulating layer 2 is disposed between the second rigid substrate 1 and the upper packaging layer.

[0062] That is, in this embodiment, the rigid high temperature electric heating element 14 is composed of the outermost first rigid metal plate and the second rigid metal plate; the second outermost first insulating layer 10 and the second insulating layer 2, and the middle flexible electric heating film 13. Figure 2 Preferably, the thickness of the first insulating layer 10 and the second insulating layer 2 are both 10-200 um.

[0063] In this embodiment, TPI (thermoplastic polyimide) is used to make the first insulating layer 10 and the second insulating layer 2; TPI is a thermoplastic material that melts at high temperatures and has a bonding effect after hot pressing and cooling, and can bond the metal plate and the PI electric heating film together, while also having an insulating effect.

[0064] Each insulating layer of the utility model can be pre-bonded and sprayed with the corresponding rigid substrate, or pressed on the corresponding rigid substrate, or can be laminated with the flexible electric heating layer 8 and then heat-pressed together.

[0065] The preparation steps of the rigid high temperature electric heating element 14 of the utility model are as follows:

[0066] Step 1: Prepare and connect the rigid substrate and insulating layer

[0067] There are two ways to connect the rigid substrate and the insulating layer. One is to pre-press the insulating layer onto the corresponding rigid substrate, and the other is to lay the insulating layer and the flexible electric heating film 13 together and then perform heat pressing and compounding.

[0068] This embodiment adopts a method of pre-pressing the insulating layer and the rigid substrate, specifically: the rigid substrate and the insulating layer (made of TPI film) of the same size as the rigid substrate are laid out and placed in a vacuum hot press (a hot press laminating machine can also be used for pre-pressing and bonding, and the excess TPI film can be trimmed after laminating and hot pressing). After the hot press is set to a certain temperature and time, the TPI film and the rigid substrate can be pre-pressed together to obtain a first rigid substrate 11 with a first insulating layer 10 pressed together and a second rigid substrate 1 with a second insulating layer 2 pressed together.

[0069] Step 2: Prepare the flexible electric heating layer 8

[0070] In this embodiment, the heating body 16 of the flexible electric heating layer 8 is made of metal + metal oxide material, and the flexible substrate is made of a 25 um thick PI film, so that the flexible substrate maintains good stability and flatness during the coating process.

[0071] 1. If Figure 6 As shown, a PET film 18 of a certain thickness is pre-coated on the back of a flexible substrate with a thickness of less than or equal to 50um as a support. In the preparation process, metals and metal oxides are sputtered according to the formula. The square resistance of the heating element is 1-600Ω / □ and the thickness is 10-500nm. The heating element 16 and the flexible substrate and the PET film 18 on the back of the flexible substrate form a roll or sheet-like whole. The PET film 18 on the back is tightly attached to the back of the flexible substrate and is slightly bonded. It can be peeled and torn by hand. The heating element 16 and the flexible substrate form an organic whole and cannot be separated.

[0072] 2. A conductive silver paste 7 is prepared on the surface of the heating element 16 after coating by a screen printing process. The conductive silver paste 7 is screen printed on both sides of the heating element. After screen printing and drying, the conductive silver paste 7 is in close contact with the heating element 16 to form an ohmic contact.

[0073] 3. Use a laminating device to attach the metal foil current carrying strip 6 to the conductive silver paste 7. In this preparation process, the metal foil current carrying strip 6 is made of copper foil. The copper foil is attached to the surface of the conductive silver paste 7 through a copper foil unwinding mechanism, and there is a 0-5mm misalignment with the conductive silver paste 7. Figure 1 , Figure 4 and Figure 7 As shown;

[0074] In other embodiments, Figure 5 As shown, a copper foil with several holes on the surface is used as a current-carrying strip so that the TPI glue of the packaging layer flows into the small holes 15, so that the copper foil is better bonded to the conductive silver paste 7 and the heating body 16 after coating, thereby obtaining a flexible electric heating layer 8.

[0075] Step 3: Prepare an upper packaging layer and a lower packaging layer 9, and connect the upper packaging layer to the flexible electric heating layer 8 to obtain a flexible electric heating film 13

[0076] 1. While the copper foil and the silver paste are being bonded, the second packaging film 4 is hot-pressed onto the side of the heating body 16 with the conductive silver paste 7 by a laminating device, which plays a role in fixing and protecting the package. The second packaging film 4 of this embodiment is a PI film material pre-coated with TPI glue. A hot-press laminating machine is used to pre-press the PI film with TPI glue onto the side of the heating body 16 with the conductive silver paste 7 at a preset temperature and pressure. The side with TPI glue is in close contact with the copper foil and the heating body 16. At the same time, the TPI glue fixes the copper foil, the conductive silver paste 7, and the coated heating body 16 to obtain a firmly bonded composite electrode. After laminating, the heating body 16, the copper foil, and the second packaging film 4 are cut to the required size.

[0077] 2. Place the cut heating body 16, copper foil and second packaging film 4 in a quick press for hot pressing for 60-1000 seconds at a temperature of 150-210°C. After quick pressing, place them in an oven for aging and baking for 10-300 minutes at a temperature of 150-210°C. The baking step can also be placed later and then aging after the first packaging film 3 and the lower packaging layer 9 are prepared and connected;

[0078] 3. Laminate the first packaging film 3 and the lower packaging layer 9 with a laminating machine. Before laminating in this step, tear off the PET (polyethylene terephthalate) film 18 on the back of the flexible substrate. After pre-pressing the laminating film, a flexible electric heating film 13 is formed. Then, the flexible electric heating film 13 is pressed with a hot press for 60-1000 seconds at a temperature of 150-210° C. The flexible electric heating film 13 after quick pressing is placed in an oven for aging and baking for 10-300 minutes at a temperature of 150-210° C. The aging and baking in this step can also be performed together with the next step of laying a rigid substrate;

[0079] Step 4: Connect the flexible electric heating film 13 to the rigid substrate and the packaging insulation layer respectively

[0080] 1. The first rigid substrate 11 laminated with the first insulating layer 10 and the second rigid substrate 1 laminated with the second insulating layer 2 in step 1 are respectively laid on the corresponding positions of the flexible electric heating film 13 prepared in the above step to form a laminated structure, and the laminated structure is hot-pressed and bonded by a hot press, and then placed in an oven for baking and curing for 60-1000 seconds at a temperature of 150-210°C;

[0081] 2. After aging, use laser equipment to etch and clean the position where the electrode is to be led out, that is, the insulating layer and the packaging layer corresponding to the position of the electrode groove reserved in the second rigid substrate 1, to expose the copper foil, weld the wire 5 to the copper foil, and then seal the electrode welding point;

[0082] In other embodiments, holes may be pre-reserved at positions corresponding to the upper and lower packaging layers, the first and second insulating layers, and the second rigid substrate 1 to facilitate electrode extraction;

[0083] 3. Use a drilling tool to drill holes at corresponding positions of the first rigid substrate 11 and the second rigid substrate 1, and then install screws and ground wires 19 at the drilled positions to obtain the rigid high-temperature electric heating component 14 of the utility model.

[0084] Compared with the prior art, the utility model has the following beneficial effects:

[0085] (1) The utility model sets the packaging layer and the insulating layer of the flexible electric heating film as a high-temperature resistant colloid material, and fixes the flexible electric heating film on a rigid substrate to obtain a rigid high-temperature electric heating component; the rigid high-temperature electric heating component improves the high-temperature resistance of the flexible electric heating film and prevents the deformation of the flexible electric heating film, so the utility model has better heating performance at high temperatures;

[0086] (2) The utility model arranges the heating body on the flexible substrate by means of magnetron sputtering vacuum coating, silk screen printing or spraying to prepare a flexible electric heating layer with planar heating, which heats evenly and quickly and can effectively improve the heating speed and effect of rigid high-temperature electric heating components;

[0087] (3) The utility model punches holes on the metal foil current-carrying strip, making it easier to exhaust the air inside the flexible electric heating layer. The colloid of the sealing film can better bond and fix the metal foil current-carrying strip and the silver paste, thereby improving the adhesion between the metal foil current-carrying strip and the conductive silver paste and the heating body, thereby reducing the contact resistance. Therefore, the utility model has a higher heating efficiency.

[0088] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A rigid high temperature electric heating component, characterized in that: It includes an upper packaging layer, a flexible electric heating layer, a lower packaging layer and a first rigid substrate arranged from top to bottom; The upper packaging layer and the lower packaging layer are made of high temperature resistant colloid material.

2. The rigid high temperature electric heating element according to claim 1, characterized in that: Also included is a second rigid substrate; The second rigid substrate is arranged on a side of the upper packaging layer away from the flexible electric heating layer.

3. The rigid high temperature electric heating element according to claim 2, characterized in that: The material of the first rigid substrate and the second rigid substrate is any one of calcium silicate board, cement fiber board, ceramic board and rock board.

4. The rigid high temperature electric heating element according to claim 2, characterized in that: Also includes a first insulating layer and a second insulating layer; The first insulating layer is disposed between the lower packaging layer and the first rigid substrate; The second insulating layer is disposed between the second rigid substrate and the upper packaging layer; The first rigid substrate and the second rigid substrate are made of metal.

5. The rigid high temperature electric heating element according to claim 4, characterized in that: The first insulating layer and the second insulating layer are made of thermoplastic polyimide.

6. The rigid high temperature electric heating element according to claim 1, characterized in that: The high temperature resistant colloid material is any one of thermoplastic polyimide, polyimide and thermoplastic polyimide composite material.

7. The rigid high temperature electric heating component according to any one of claims 1 to 6, characterized in that: The upper packaging layer includes a first packaging film and a second packaging film arranged from top to bottom.

8. The rigid high temperature electric heating element according to claim 7, characterized in that: The flexible electric heating layer comprises a conductor, a heating body and a flexible substrate arranged from top to bottom; The heating body is arranged on the flexible substrate by means of magnetron sputtering vacuum coating, silk screen printing or spraying.

9. The rigid high temperature electric heating element according to claim 8, characterized in that: The conductor comprises a conductive wire, a metal foil current-carrying bar and a conductive silver paste arranged from top to bottom; The conductive wire is connected to the metal foil bus bar; The metal foil current-carrying bar is staggered with the conductive silver paste and is respectively bonded to the conductive silver paste and the heating body through thermoplastic polyimide.

10. The rigid high temperature electric heating element according to claim 8, characterized in that: The conductor comprises a conductive wire, a metal foil current-carrying bar and a conductive silver paste arranged from top to bottom; The wire is connected to the metal foil bus bar; The metal foil current-carrying bar and the conductive silver paste are arranged in a staggered manner, and the metal foil current-carrying bar is provided with a plurality of holes along its extending direction.

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