Multi-section flat PTC (Positive Temperature Coefficient) electrothermal film

Abstract

The utility model relates to the technical field of electrothermal films, and discloses a multi-section flat PTC electrothermal film, which comprises a carbon layer, an anode metal diversion strip and a cathode metal diversion strip, and is characterized in that one end, far away from the anode metal diversion strip, of the upper surface of the carbon layer is tightly attached and connected with the cathode metal diversion strip; the middle part of the upper surface of the carbon layer is tightly attached and connected with an upper thermal expansion isolation layer, the upper surface of the upper thermal expansion isolation layer is tightly attached and connected with an upper insulating layer, and the lower surface of the carbon layer is tightly attached and connected with a lower thermal expansion isolation layer. Compared with most existing multi-section type flat PTC electrothermal films, the multi-section type flat PTC electrothermal film has the advantages that the mechanical strength of the electrothermal film is improved through the anti-stretching layer, the anti-stretching net and the anti-stretching strips, and when the electrothermal film encounters external pulling force, the anti-stretching layer and other protective layers can cooperate with each other, so that the anti-stretching performance of the electrothermal film is improved, and the anti-stretching performance of the electrothermal film is improved. Damage caused by pulling to the internal structure of the electrothermal film is effectively relieved, and therefore the tensile property of the electrothermal film is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrothermal film technology, and in particular to a multi-segment flat PTC electrothermal film. Background Technology

[0002] Electric heating film is a flexible thin-film heating element that efficiently converts electrical energy into heat energy. PTC electric heating film is made of positive temperature coefficient semiconductor material, and its resistance value increases significantly with the increase of temperature. It can automatically limit the power without the need for external temperature control device to avoid overheating. This type of electric heating film has the characteristics of high safety, uniform heating and fast response speed, and is widely used in constant temperature heating, floor heating system and other fields.

[0003] An existing patent (publication number: CN201821770683.9) discloses a PTC frequency conversion self-regulating temperature electric heating film, including an electric heating film layer. A first shielding layer and a second shielding layer are fixedly connected to both sides of the electric heating film layer, respectively. A first insulating layer is fixedly connected to the side of the first shielding layer away from the electric heating film layer, and a second insulating layer is fixedly connected to the side of the second shielding layer away from the electric heating film layer. In the process of realizing this utility model, the inventors found the following problems with the prior art. This kind of electric heating film has waterproof, flame-retardant, and wear-resistant properties, which improves the safety and reliability of the electric heating film and extends its service life. However, this kind of electric heating film lacks tensile strength design, and its internal structure is easily damaged under external force, affecting the overall stability.

[0004] Therefore, those skilled in the art have provided a multi-segment flat-plate PTC electrothermal film to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-segment flat PTC heating film. Compared to traditional multi-segment flat PTC heating films, this multi-segment flat PTC heating film features a thermal expansion isolation layer that automatically deforms at high temperatures to block the conductive path, achieving a passive self-limiting temperature function. Simultaneously, the insulation layer prevents heat loss from the bottom, and the upper and lower insulation layers ensure the safety of the heating film. Furthermore, the addition of a tensile-resistant layer, along with tensile mesh and tensile strips, enhances the mechanical strength of the heating film. When the heating film encounters external tensile forces, the synergistic effect of the tensile-resistant layer and other protective layers effectively mitigates damage to the internal structure of the heating film, thereby improving its tensile performance.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A multi-segment flat PTC electric heating film includes a carbon layer, a positive electrode metal current-conducting strip, and a negative electrode metal current-conducting strip. The negative electrode metal current-conducting strip is tightly attached to one end of the upper surface of the carbon layer away from the positive electrode metal current-conducting strip. An upper thermal expansion isolation layer is tightly attached to the middle part of the upper surface of the carbon layer. An upper insulating layer is tightly attached to the upper surface of the upper thermal expansion isolation layer.

[0008] A lower thermal expansion insulating layer is tightly bonded to the lower surface of the carbon layer. A lower insulating layer is tightly bonded to the lower surface of the lower thermal expansion insulating layer. A heat insulation layer is tightly bonded to the lower surface of the lower insulating layer. A tensile layer is tightly bonded to the lower surface of the heat insulation layer. The tensile layer includes a tensile mesh. Multiple tensile strips are fixedly connected to both ends of the upper surface of the tensile mesh. A base layer is tightly bonded to the lower surface of the tensile layer. A PET film layer is tightly bonded to the upper surface of the upper insulating layer.

[0009] Through the above technical solution, the multi-segment flat PTC electric heating film is equipped with a thermal expansion isolation layer, which automatically deforms at high temperature to block the conductive path and realizes a passive self-limiting temperature function. Through the synergistic effect of the tensile layer and other protective layers, the damage caused by external tensile force to the electric heating film is alleviated, and the tensile performance of the electric heating film is improved.

[0010] Furthermore, the positive electrode metal current guide strip and the negative electrode metal current guide strip are respectively located on both sides of the upper surface of the carbon layer, and the material of the positive electrode metal current guide strip and the negative electrode metal current guide strip is copper;

[0011] Through the above technical solution, copper has good electrical conductivity, and setting positive and negative current-conducting strips on both sides of the upper surface of the carbon layer helps to optimize the current distribution and reduce the contact resistance.

[0012] Furthermore, the thermal expansion insulation layer is made of ceramic, and the insulating layer is made of mica;

[0013] Through the above technical solutions, the thermal expansion isolation layer made of ceramic material blocks the heating element through crystal phase transformation or microcrack propagation, and the insulating layer made of mica material physically blocks the overheated heating element.

[0014] Furthermore, the heat insulation layer is made of ceramic fiber, the tensile layer is made of glass fiber, the tensile mesh is made of interwoven glass fiber cloth, and the base layer is made of glass fiber epoxy resin.

[0015] Through the above technical solution, a heat insulation layer is set to prevent heat loss from the bottom, an anti-tensile layer is set to enhance the mechanical strength of the electric heating film and improve its tensile performance, and a base layer provides mechanical support and insulation for the electric heating film.

[0016] This utility model has the following beneficial effects:

[0017] This utility model proposes a multi-segment flat PTC heating film. Compared with most existing multi-segment flat PTC heating films, this multi-segment flat PTC heating film has a passive self-limiting temperature function by setting a thermal expansion isolation layer, which automatically deforms at high temperatures to block the conductive path. At the same time, the setting of the heat insulation layer prevents heat loss from the bottom, and the setting of the upper and lower insulation layers ensures the safety of the heating film.

[0018] This invention proposes a multi-segment flat PTC heating film. Compared with most existing multi-segment flat PTC heating films, this multi-segment flat PTC heating film improves the mechanical strength of the heating film by setting an anti-tensile layer and using an anti-tensile mesh and anti-tensile strips. When the heating film is subjected to external tensile force, it can effectively alleviate the damage to the internal structure of the heating film caused by the tensile layer and other protective layers through the synergistic effect, thereby improving the tensile performance of the heating film. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-segment flat plate PTC electric heating film proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the flow guide strip in a multi-segment flat PTC electric heating film proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the tensile-resistant layer in a multi-segment flat PTC electric heating film proposed in this utility model;

[0022] Figure 4 This is a cross-sectional view of a multi-segment flat PTC electric heating film proposed in this utility model.

[0023] Legend:

[0024] 1. Carbon layer; 2. Positive electrode metal conductor strip; 3. Negative electrode metal conductor strip; 4. Upper insulating layer; 5. Lower insulating layer; 6. PET film layer;

[0025] 7. Tensile layer; 701. Tensile mesh; 702. Tensile strip;

[0026] 8. Insulation layer; 9. Upper thermal expansion insulation layer; 10. Lower thermal expansion insulation layer; 11. Base layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] One embodiment of this utility model is provided:

[0029] Reference Figure 1 , Figure 2 and Figure 4 It includes a carbon layer 1, a positive electrode metal current guide strip 2 and a negative electrode metal current guide strip 3. The negative electrode metal current guide strip 3 is tightly attached to one end of the upper surface of the carbon layer 1 away from the positive electrode metal current guide strip 2. An upper thermal expansion isolation layer 9 is tightly attached to the middle part of the upper surface of the carbon layer 1. An upper insulating layer 4 is tightly attached to the upper surface of the upper thermal expansion isolation layer 9.

[0030] A lower thermal expansion insulating layer 10 is tightly bonded to the lower surface of the carbon layer 1. A lower insulating layer 5 is tightly bonded to the lower surface of the lower thermal expansion insulating layer 10. A heat insulation layer 8 is tightly bonded to the lower surface of the lower insulating layer 5. A tensile layer 7 is tightly bonded to the lower surface of the heat insulation layer 8. The tensile layer 7 includes a tensile mesh 701. Multiple tensile strips 702 are fixedly connected to both ends of the upper surface of the tensile mesh 701. A base layer 11 is tightly bonded to the lower surface of the tensile layer 7. A PET film layer 6 is tightly bonded to the upper surface of the upper insulating layer 4.

[0031] The multi-segment flat PTC heating film is equipped with a thermal expansion isolation layer, which automatically deforms at high temperatures to block the conductive path and achieve a passive self-limiting temperature function. Through the synergistic effect of the tensile layer 7 and other protective layers, the damage caused by external tensile force to the heating film is mitigated, and the tensile performance of the heating film is improved.

[0032] Reference Figure 1 and Figure 2 The positive electrode metal current guide strip 2 and the negative electrode metal current guide strip 3 are located on both sides of the upper surface of the carbon layer 1, respectively. The positive electrode metal current guide strip 2 and the negative electrode metal current guide strip 3 are made of copper. Copper has good conductivity. Setting positive and negative current guide strips on both sides of the upper surface of the carbon layer 1 is beneficial to optimizing the current distribution and reducing the contact resistance.

[0033] Reference Figure 1 and Figure 4 The thermal expansion insulation layer is made of ceramic, the insulation layer is made of mica, the ceramic thermal expansion insulation layer blocks the heating element through crystal phase transformation or microcrack propagation, the mica insulation layer physically blocks the overheated heating element, and the insulation layer 8 is made of ceramic fiber.

[0034] Reference Figure 3 and Figure 4 The tensile layer 7 is made of glass fiber, the tensile mesh 701 is made of interwoven glass fiber cloth, the base layer 11 is made of glass fiber epoxy resin, the heat insulation layer 8 is provided to prevent heat loss from the bottom, the tensile layer 7 is provided to enhance the mechanical strength of the electric heating film and improve the tensile performance of the electric heating film, and the base layer 11 provides mechanical support and insulation for the electric heating film.

[0035] Working principle: When the temperature of the electric heating film is too high, the thermal expansion insulation layer deforms under high temperature, physically isolating part of the conductive area and reducing the current path, thereby achieving the effect of self-limiting temperature. In daily use of the electric heating film, the insulation layer effectively blocks current leakage, prevents the risk of electric shock, and ensures the safety of the electric heating film. The heat insulation layer 8 isolates the heat at the bottom, preventing heat loss from the bottom. The tensile strength of the electric heating film is improved by the cooperation of the tensile layer 7, the base layer 11 and the PET film layer 6, preventing damage to the internal components caused by external pulling.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-section flat plate PTC electric heating film, comprising a carbon layer (1), a positive metal bus bar (2) and a negative metal bus bar (3), characterized in that: The upper surface of the carbon layer (1) is tightly connected with the negative metal current-carrying bar (3) at one end away from the positive metal current-carrying bar (2), the middle of the upper surface of the carbon layer (1) is tightly connected with the upper thermal expansion isolation layer (9), and the upper surface of the upper thermal expansion isolation layer (9) is tightly connected with the upper insulation layer (4); The lower surface of the carbon layer (1) is tightly connected with the lower thermal expansion isolation layer (10), the lower surface of the lower thermal expansion isolation layer (10) is tightly connected with the lower insulation layer (5), the lower surface of the lower insulation layer (5) is tightly connected with the heat insulation layer (8), the lower surface of the heat insulation layer (8) is tightly connected with the anti-stretching layer (7), the anti-stretching layer (7) comprises an anti-stretching net (701), both ends of the upper surface of the anti-stretching net (701) are fixedly connected with a plurality of anti-stretching strips (702), and the lower surface of the anti-stretching layer (7) is tightly connected with the base layer (11).

2. The multi-section flat plate PTC electrothermal film according to claim 1, characterized in that: The positive metal current-carrying bar (2) and the negative metal current-carrying bar (3) are respectively located on both sides of the upper surface of the carbon layer (1), and the materials of the positive metal current-carrying bar (2) and the negative metal current-carrying bar (3) are copper.

3. The multi-segment flat plate PTC electrothermal film according to claim 1, characterized in that: The material of the thermal expansion isolation layer is ceramic, and the material of the insulation layer is mica.

4. The multi-segment flat plate PTC electrothermal film according to claim 1, characterized in that: The material of the heat insulation layer (8) is ceramic fiber, the material of the anti-stretching layer (7) is glass fiber, the anti-stretching net (701) is formed by longitudinal and horizontal interweaving of glass fiber cloth, and the material of the base layer (11) is glass fiber epoxy resin.

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