PTC heating film with good thermal conductivity
By designing heating components and protective components in the PTC heating film, the hot issues caused by too small contact area between the conductive lines and thermistors are solved, and the mechanical strength is improved, so that the uniform heating of the heating film and the service life are extended.
Patent Information
- Application Number
- CN202422656411.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-11-01
AI Technical Summary
During the use of the existing PTC heating film, due to the small contact area between the conductive lines and the thermistor, the current density is too high, forming hot spots, affecting the heating uniformity and shortening the service life. At the same time, the mechanical strength is insufficient, and it is easy to be damaged due to deformation and damage due to external pressure.
A PTC heating film with good thermal conductivity is designed, by providing heating components and protective components on a ceramic substrate. The heating assembly includes conductive lines, input leads, output leads and cavity. The conductive lines are distributed serpentine, increasing the contact area with the thermistor; the protection assembly includes an insulating layer, a top plate, a bottom plate and a support block to increase mechanical strength and provide electrical isolation.
By increasing the contact area between the conductive lines and the thermistor, the temperature distribution of the heating film is achieved more uniformly, avoiding the formation of hot spots and extending the service life; at the same time, the improved mechanical strength can effectively resist external pressure and prevent deformation and damage of the heating film.
Smart Images
Figure CN223040167U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heating film production, specifically a PTC heating film with good thermal conductivity. Background Technique
[0002] A PTC heating film is a heating element made of a positive temperature coefficient thermistor material. The resistance value of this material increases with the increase of temperature, so it has a self-limiting temperature characteristic, that is, when a certain temperature is reached, its resistance increases and the current decreases, thereby limiting the further rise of temperature. This makes the PTC heating film relatively safe in use and can automatically adjust to a stable working temperature.
[0003] However, during the use of the existing heating film, the contact area between the internal thermistor and the conductive circuit is too small, resulting in too high current density at the contact point, thus forming a hot spot in this area. This not only affects the overall heating uniformity of the heating film, but also may shorten the service life of the heating film. At the same time, the overall mechanical strength of the existing heating film is not high. When subjected to external pressure, the heating film is easily concave and deformed, squeezing the internal thermistor, causing damage to the heating film and unable to be used normally. Content of the Utility Model
[0004] In view of the above situation, to overcome the defects of the existing technology, this embodiment provides a PTC heating film with good thermal conductivity, which solves at least the above technical problems.
[0005] To achieve the above purpose, the utility model provides the following technical solution: a PTC heating film with good thermal conductivity, including:
[0006] A ceramic substrate, on the top of which there are a plurality of PTC thermistors, and a first encapsulation board and a second encapsulation board are respectively arranged at both ends of the ceramic substrate;
[0007] A heating component arranged between the second encapsulation board and the PTC thermistor, the heating component includes: a conductive circuit, an input lead, an output lead and a cavity. A conductive circuit is arranged on the surface of the PTC thermistor, a cavity is opened inside the second encapsulation board, an input lead is arranged inside the cavity, and an output lead is arranged inside the cavity.
[0008] Further, the conductive circuit is distributed in a snake shape on the surface of the PTC thermistor, one side of the input lead is connected with a plurality of first wires, and the plurality of first wires respectively extend to one side of the plurality of PTC thermistors and are connected with the plurality of conductive circuits.
[0009] Further, one side of the output lead is connected with a plurality of second wires, and the plurality of second wires respectively extend to one side of the plurality of PTC thermistors and are connected with the other end of the conductive circuit.
[0010] Furthermore, an input electrode and an output electrode are provided on one side of the second encapsulation board. The input electrode is connected to the input lead, and the output electrode is connected to the output lead.
[0011] Furthermore, a protection component is provided on the ceramic substrate. The protection component includes: an insulating layer, a top plate, a bottom plate, and a support block. An insulating layer is provided on the top of the ceramic substrate, a top plate is connected to the top of the insulating layer, and a bottom plate is connected to the bottom of the ceramic substrate.
[0012] Furthermore, both the top plate and the bottom plate are made of metal plate materials.
[0013] Furthermore, a plurality of support blocks are connected to the top of the ceramic substrate, and the support blocks are silicone rubber blocks.
[0014] The present utility model provides a PTC heating film with good thermal conductivity, having the following beneficial effects:
[0015] The advantages of the present utility model are that through the setting of the heating component, the contact area with the thermistor can be increased, local resistance concentration can be reduced, so that the temperature distribution of the entire heating film is more uniform. At the same time, it can avoid the contact area between the conductive circuit and the PTC thermistor being too small, resulting in too high current density at the contact point, thus forming a hot spot in this area, reducing the heating uniformity and shortening the service life of the heating film. Secondly, through the setting of the protection component, the mechanical strength of the heating film can be improved, effectively resisting external pressure, and avoiding the heating film being deformed and concave inward by external force, causing damage to the heating film. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0017] Figure 2 It is a cross-sectional view of the overall structure of the present utility model.
[0018] Figure 3 It is a top view of the ceramic substrate structure of the present utility model..
[0019] Figure 4 It is a schematic diagram of the PTC thermistor structure of the present utility model.
[0020] Figure 5 It is a schematic diagram of the conductive circuit structure of the present utility model.
[0021] Figure 6 It is a schematic diagram of the support block structure of the present utility model.
[0022] Figures 1-6In the figure: 1. Ceramic substrate; 101. PTC thermistor; 102. Conductive circuit; 103. Support block; 2. Insulating layer; 3. Top plate; 301. Bottom plate; 4. First encapsulation plate; 5. Second encapsulation plate; 501. Cavity; 6. Input lead; 601. Input electrode; 602. First wire; 7. Output lead; 701. Output electrode; 702. Second wire. Detailed implementation manners
[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0024] The PTC heating film with good thermal conductivity will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments.
[0025] The present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.
[0026] Please refer to Figures 1-6 In the figure, a PTC heating film with good thermal conductivity provided in this embodiment includes: a ceramic substrate 1, a plurality of PTC thermistors 101 are provided on the top of the ceramic substrate 1, and a first encapsulation plate 4 and a second encapsulation plate 5 are respectively provided at both ends of the ceramic substrate 1; a heating component disposed between the second encapsulation plate 5 and the PTC thermistor 101, the heating component includes: a conductive circuit 102, an input lead 6, an output lead 7 and a cavity 501, and a protection component is provided on the ceramic substrate 1, the protection component includes: an insulating layer 2, a top plate 3, a bottom plate 301 and a support block 103.
[0027] Among them, through the setting of the heating component, the contact area between the conductive circuit 102 and the PTC thermistor 101 can be increased, and the local resistance concentration can be reduced, so that the temperature distribution of the entire heating film is more uniform, avoiding the contact area between the conductive circuit 102 and the PTC thermistor 101 being too small, resulting in too high current density at the contact point and forming a hot spot in this area, thereby reducing the uniformity of the heating film during heating and shortening the service life of the heating film. Secondly, through the setting of the protection component, the mechanical strength of the heating film can be improved, effectively resisting external pressure and avoiding the heating film being deformed and concave inward by external force, resulting in damage to the heating film.
[0028] Among them, a conductive circuit 102 is provided on the surface of the PTC thermistor 101. A cavity 501 is formed inside the second encapsulation board 5. An input lead 6 is provided inside the cavity 501, and an output lead 7 is provided inside the cavity 501. The conductive circuit 102 is distributed in a serpentine shape on the surface of the PTC thermistor 101. One side of the input lead 6 is connected with a plurality of first wires 602. The plurality of first wires 602 respectively extend to one side of a plurality of PTC thermistors 101 and are connected with the plurality of conductive circuits 102. One side of the output lead 7 is connected with a plurality of second wires 702. The plurality of second wires 702 respectively extend to one side of the plurality of PTC thermistors 101 and are connected with the other ends of the conductive circuits 102.
[0029] Further, an input electrode 601 and an output electrode 701 are provided on one side of the second encapsulation board 5. The input electrode 601 is connected with the input lead 6, and the output electrode 701 is connected with the output lead 7.
[0030] When the heating film is heated up, current is transmitted to the input lead 6 through the input electrode 601, and the current is shunted to the plurality of first wires 602 through the input lead 6. Then, the current is transmitted to the conductive circuit 102 through the first wires 602, so that the current passes through the PTC thermistor 101 to generate Joule heat. Through the setting of the conductive circuit 102, the contact area between the conductive circuit 102 and the PTC thermistor 101 is increased. The larger the contact area, the wider the path for the current to pass through. This can reduce the local resistance concentration, so that the temperature distribution of the entire heating film is more uniform. At the same time, the larger contact area means better heat conduction, enabling more heat to be transferred from the PTC thermistor 101 to other parts or the environment through the contact surface. At the same time, it can avoid the contact area between the conductive circuit and the PTC thermistor 101 being too small, resulting in too high current density at the contact point, thus forming a hot spot in this area. This will not only reduce the heating uniformity but also may shorten the service life of the heating film.
[0031] Then, the current is output to the output lead 7 through the second wire 702 and discharged through the output electrode 701, so that the first wire 602, the second wire 702 and the conductive circuit 102 form a closed loop.
[0032] Among them, an insulating layer 2 is provided on the top of the ceramic substrate 1. A top plate 3 is connected to the top of the insulating layer 2. A bottom plate 301 is connected to the bottom of the ceramic substrate 1. Both the top plate 3 and the bottom plate 301 are made of metal plate materials. A plurality of support blocks 103 are connected to the top of the ceramic substrate 1, and the support blocks 103 are silicone rubber blocks.
[0033] Among them, the insulating layer 2 is made of polyester film material. The polyester film has good electrical insulation and mechanical strength, relatively low cost, can provide electrical isolation to prevent short circuits, and may also protect the internal structure from the external environment.
[0034] Then both the top plate 3 and the bottom plate 301 are made of metal plate materials, so that the top plate 3 and the bottom plate 301 can provide extremely high physical protection and heat conduction performance, extending the service life of the heating film. Then, through the arrangement of a plurality of support blocks 103, the ceramic substrate 1 can be divided into a plurality of chambers, providing electrical isolation for the plurality of PTC thermistors 101 inside. At the same time, the silicone rubber material has excellent flexibility, heat resistance and anti-aging performance, and can resist the heat generated by the PTC thermistors 101.
[0035] Next, the ceramic substrate 1 has extremely high heat resistance, good mechanical strength and excellent electrical insulation performance. Combined with the arrangement of the insulating layer 2, it can completely cover the PTC thermistors 101, avoiding the occurrence of leakage and short circuit. At the same time, its mechanical strength can provide effective support for the top plate 3 and the bottom plate 301, preventing the heating film from deforming and squeezing the PTC thermistors 101, resulting in damage to the PTC thermistors 101.
[0036] Working principle:
[0037] When the heating film is heated up, the current is transmitted to the input lead 6 through the input electrode 601, and then the current is shunted from the input lead 6 to a plurality of first wires 602. Then, the current is transmitted to the conductive circuit 102 through the first wires 602, so that the current passes through the PTC thermistors 101, generating Joule heat. Through the arrangement of the conductive circuit 102, the contact area between the conductive circuit 102 and the PTC thermistors 101 is increased. The larger the contact area, the wider the path for the current to pass through, which can reduce the local resistance concentration, thus making the temperature distribution of the entire heating film more uniform. At the same time, a larger contact area means better heat conduction, enabling more heat to be transferred from the PTC thermistors 101 to other parts or the environment through the contact surface. At the same time, it can avoid the contact area between the conductive circuit and the PTC thermistors 101 being too small, resulting in too high current density at the contact point, thus forming a hot spot in this area, which will not only reduce the heating uniformity but also may shorten the service life of the heating film.
[0038] Among them, the insulating layer 2 is made of polyester film material. Polyester film has good electrical insulation and mechanical strength, relatively low cost, can provide electrical isolation to prevent short circuits, and may also protect the internal structure from the external environment. Then, both the top plate 3 and the bottom plate 301 are made of metal plate materials, so that the top plate 3 and the bottom plate 301 can provide extremely high physical protection and heat conduction performance, and extend the service life of the heating film. Next, through the setting of multiple support blocks 103, the ceramic substrate 1 can be divided into multiple chambers, providing electrical isolation for the multiple PTC thermistors 101 inside. At the same time, the silicone rubber material has excellent flexibility, heat resistance and anti-aging performance, and can resist the heat generated by the PTC thermistors 101. Then, the ceramic substrate 1 has extremely high heat resistance, good mechanical strength and excellent electrical insulation performance. Combined with the setting of the insulating layer 2, it can completely cover the PTC thermistors 101 and avoid the occurrence of leakage and short circuit. At the same time, its mechanical strength can effectively support the top plate 3 and the bottom plate 301, avoiding the heating film from deforming and squeezing the PTC thermistors 101, resulting in damage to the PTC thermistors 101.
[0039] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0040] The above has introduced in detail a PTC heating film with good thermal conductivity provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A PTC heating film with good thermal conductivity, characterized in that: include: A ceramic substrate (1), wherein a plurality of PTC thermistors (101) are provided on the top of the ceramic substrate (1), and a first packaging plate (4) and a second packaging plate (5) are provided at two ends of the ceramic substrate (1); A heating component is arranged between the second packaging board (5) and the PTC thermistor (101), the heating component comprising: a conductive circuit (102), an input lead (6), an output lead (7) and a cavity (501); the conductive circuit (102) is provided on the surface of the PTC thermistor (101); the cavity (501) is provided inside the second packaging board (5); the input lead (6) is provided inside the cavity (501); and the output lead (7) is provided inside the cavity (501).
2. The PTC heating film with good thermal conductivity according to claim 1, characterized in that: The conductive circuit (102) is distributed in a serpentine shape on the surface of the PTC thermistor (101); one side of the input lead (6) is connected to a plurality of first conductive wires (602); the plurality of first conductive wires (602) respectively extend to one side of a plurality of the PTC thermistors (101) and are connected to the plurality of conductive circuits (102).
3. The PTC heating film with good thermal conductivity according to claim 2, characterized in that: One side of the output lead (7) is connected to a plurality of second conductive wires (702), and the plurality of second conductive wires (702) respectively extend to one side of the plurality of PTC thermistors (101) and are connected to the other end of the conductive line (102).
4. The PTC heating film with good thermal conductivity according to claim 2, characterized in that: An input electrode (601) and an output electrode (701) are provided on one side of the second packaging board (5); the input electrode (601) is connected to the input lead (6), and the output electrode (701) is connected to the output lead (7).
5. The PTC heating film with good thermal conductivity according to claim 1, characterized in that: A protective component is provided on the ceramic substrate (1), the protective component comprising: an insulating layer (2), a top plate (3), a bottom plate (301) and a support block (103); the insulating layer (2) is provided on the top of the ceramic substrate (1); the top of the insulating layer (2) is connected to the top plate (3); and the bottom of the ceramic substrate (1) is connected to the bottom plate (301).
6. The PTC heating film with good thermal conductivity according to claim 5, characterized in that: The top plate (3) and the bottom plate (301) are both metal plates.
7. The PTC heating film with good thermal conductivity according to claim 5, characterized in that: A plurality of support blocks (103) are connected to the top of the ceramic substrate (1), and the support blocks (103) are silicon rubber blocks.