PTC heating core and PTC heater

Abstract

The utility model relates to the technical field of heating devices, in particular to a PTC (Positive Temperature Coefficient) heating core and a PTC heater. The PTC heating core comprises: a ceramic heating sheet; the electrode plates are arranged on the two sides of the ceramic heating sheet in the thickness direction; one side, far away from the ceramic heating sheet, of each electrode sheet is provided with one insulating substrate; the insulating substrate comprises a metal plate and an insulating film, and at least one side plate surface of the metal plate is wrapped with the insulating film. The PTC heating core provided by the utility model is high in stability and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of heating devices, in particular to a PTC heating core and a PTC heater. Background Art

[0002] The PTC (Positive Temperature Coefficient) heater has a constant temperature heating characteristic. The principle is that after the PTC heater is powered on, the temperature rises due to self-heating, causing the resistance value to increase and enter the transition zone. The surface temperature of the PTC heater will remain constant. This temperature is only related to the Curie temperature and the applied voltage of the PTC heater, and has little to do with the ambient temperature. Even in abnormal working conditions, due to the regulation of the PTC element itself, the input power can be reduced to a very low level, and no unexpected situation will occur. Therefore, PTC heaters are widely used in automobiles and other fields.

[0003] The PTC heater includes a PTC heating core. Common PTC heating cores include a ceramic heating sheet, an electrode sheet, and a ceramic insulating substrate. The electrode sheets are attached to both sides of the ceramic heating sheet, and the side of each electrode sheet away from the ceramic heating sheet is attached to the ceramic insulating substrate. The problem is that the ceramic insulating substrate is easy to break during processing and manufacturing, and it is also possible that the ceramic insulating substrate will break due to thermal stress during later use, thus causing the insulation of the PTC heater to fail. Utility Model Content

[0004] The purpose of the utility model is to provide a PTC heating core and a PTC heater, so as to solve to a certain extent the technical problem in the prior art that the ceramic insulating substrate is easy to break during the processing and manufacturing process, and the ceramic insulating substrate may also break due to thermal stress during later use, thereby causing the insulation failure of the PTC heater.

[0005] The utility model provides a PTC heating core, comprising: a ceramic heating sheet; an electrode sheet, both sides of the ceramic heating sheet in the thickness direction of which are provided with the electrode sheet; an insulating substrate, each side of the electrode sheet away from the ceramic heating sheet is provided with the insulating substrate; the insulating substrate comprises a metal plate and an insulating film, at least one side of the metal plate is wrapped with the insulating film.

[0006] The PTC heating core provided by the utility model has an insulating substrate including a metal plate and an insulating film wrapped on at least one side of the metal plate. Compared with the ceramic insulating substrate, the metal plate has good thermal conductivity, so that the insulating substrate has good thermal conductivity; the elasticity of the metal plate is higher than that of the ceramic, and the metal plate is not easy to break during the production process, so that the insulating substrate can better ensure insulation, so that the PTC heating core has high stability and high reliability; for the PTC heating core of the same specification, the weight of the insulating substrate is less than that of the ceramic insulating substrate, so that the weight of the PTC heating core is small and the cost is low; the insulating substrate of the aluminum sheet wrapped with PI film can be directly cut out of the whole shape to achieve the same insulation effect as the ceramic insulating substrate, so that the processing technology of the PTC heating core is simple. Compared with directly setting an insulating film outside the electrode sheet, the metal plate in the PTC heating core provided in this embodiment can reduce the risk of impurities piercing the insulating film and causing insulation failure.

[0007] Furthermore, the outer surfaces of the metal plates are all wrapped with the insulating film.

[0008] Furthermore, the metal plate is an aluminum plate.

[0009] Furthermore, the insulating film is a PI film.

[0010] Furthermore, a back adhesive layer is provided on a side of the insulating film close to the metal plate; the insulating film and the metal plate are connected by a rolling bonding process.

[0011] Furthermore, a thermally conductive adhesive layer is provided between the insulating substrate and the electrode sheet, and between the electrode sheet and the ceramic heating sheet.

[0012] Furthermore, the electrode sheet comprises an electrode sheet body and pins connected to the electrode sheet body; and the board area of ​​the insulating substrate is larger than the board area of ​​the electrode sheet body.

[0013] Furthermore, the electrode sheet body and the insulating substrate are both rectangular; the length of the insulating substrate is greater than the length of the electrode sheet body by more than 5 mm.

[0014] Furthermore, the width of the insulating substrate is greater than the width of the electrode sheet body by more than 5 mm.

[0015] The utility model provides a PTC heater, comprising the above-mentioned PTC heating core.

[0016] The PTC heater provided by the utility model includes a PTC heating core, and the PTC heating core includes an insulating substrate, which includes a metal plate and an insulating film wrapped on at least one side of the metal plate. The insulating substrate has good thermal conductivity and can better ensure insulation, so that the PTC heating core has high stability and high reliability; the metal plate in the PTC heating core can reduce the risk of impurities piercing the insulating film and causing insulation failure. Therefore, the PTC heater provided by the utility model has high reliability and high stability.

[0017] It should be understood that both the foregoing general description and the following specific embodiments are for the purpose of example and illustration and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the PTC heating core of an embodiment of the utility model;

[0020] Figure 2 for Figure 1 An exploded view of the PTC heating core shown;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the insulating substrate in the PTC heating core shown;

[0022] Figure 4 for Figure 1 An exploded view of the insulating substrate is shown.

[0023] icon:

[0024] 1-Ceramic heating element;

[0025] 2-electrode sheet; 21-electrode sheet body; 22-pin;

[0026] 3-insulating substrate; 31-metal plate; 32-insulating film; 33-back adhesive layer;

[0027] 4- Thermal conductive adhesive layer. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0030] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1 to 4 As shown, an embodiment of the utility model provides a PTC heating core, comprising: a ceramic heating sheet 1; an electrode sheet 2, wherein the electrode sheets 2 are arranged on both sides of the ceramic heating sheet 1 in the thickness direction; an insulating substrate 3, wherein each electrode sheet 2 is arranged on a side away from the ceramic heating sheet 1. Specifically, in the thickness direction of the ceramic heating sheet 1, the insulating substrate 3, the electrode sheet 2, the ceramic heating sheet 1, the electrode sheet 2 and the insulating substrate 3 are arranged in sequence; the insulating substrate 3 comprises a metal plate 31 and an insulating film 32, and at least one side of the metal plate 31 is wrapped with the insulating film 32.

[0034] The PTC heating core provided in this embodiment, the insulating substrate 3 includes a metal plate 31 and an insulating film 32 wrapped on at least one side of the metal plate 31. Compared with the ceramic insulating substrate 3, the metal plate 31 has good thermal conductivity, so that the insulating substrate 3 has good thermal conductivity; the elasticity of the metal plate 31 is higher than that of the ceramic, and the metal plate 31 is not easy to break during the production process, so that the insulating substrate 3 can better ensure insulation, so that the PTC heating core has high stability and high reliability; for the PTC heating core of the same specification, the weight of the insulating substrate 3 is less than that of the ceramic insulating substrate 3, so that the weight of the PTC heating core is small and the cost is low; the insulating substrate 3 of the aluminum sheet is wrapped with a PI film, and the whole shape can be directly cut out to achieve the same insulation effect as the ceramic insulating substrate 3, so that the processing technology of the PTC heating core is simple. Compared with directly setting the insulating film 32 outside the electrode sheet 2, the metal plate 31 in the PTC heating core provided in this embodiment can reduce the risk of impurities piercing the insulating film 32 and causing insulation failure.

[0035] The number of the ceramic heating sheets 1 can be set as required, for example, one, two or three.

[0036] The insulating film 32 may be wrapped on the plate surface of the metal plate 31 which is away from the electrode sheet 2 , or may be wrapped on the plate surface of the metal plate 31 which is close to the electrode sheet 2 .

[0037] As an optional solution, the outer surface of the metal plate 31 is wrapped with an insulating film 32 , that is, the insulating film 32 completely wraps the metal plate 31 .

[0038] In this embodiment, even if impurities pierce the insulating film 32 on one side of the metal plate 31, the metal plate 31 can prevent the impurities from piercing the insulating film 32 on the other side of the metal plate 31, and the insulating film 32 on the other side can still play an insulating role, thereby further improving the insulation reliability of the insulating substrate 3, thereby further improving the stability and reliability of the PTC heating core.

[0039] Based on any of the above embodiments, further, the material of the metal plate 31 can be iron, magnesium, etc. As an optional solution, the metal plate 31 is aluminum, which has low density, good thermal conductivity and good ductility.

[0040] The insulating film 32 is a PI film.

[0041] On the basis of any of the above embodiments, further, a backing layer 33 is provided on a side of the insulating film 32 close to the metal plate 31 ; the insulating film 32 and the metal plate 31 are connected by a rolling bonding process.

[0042] In this embodiment, a backing layer 33 is provided on the insulating film 32, and after the metal plate 31 and the insulating films 32 on both sides are stacked together, they are rolled and bonded at a temperature of about 150°C to completely discharge the air between the insulating film 32 and the metal plate 31 to avoid excessive thermal resistance caused by residual air.

[0043] On the basis of any of the above embodiments, further, a thermal conductive adhesive layer 4 is provided between the insulating substrate 3 and the electrode sheet 2 and between the electrode sheet 2 and the ceramic heating sheet.

[0044] Specifically, in the thickness direction of the ceramic heating sheet 1, a first electrode sheet 2 and a first insulating substrate 3 are sequentially provided on one side of the ceramic heating sheet 1 from the inside to the outside, and a second electrode sheet 2 and a second insulating substrate 3 are sequentially provided on the other side of the ceramic heating sheet 1 from the inside to the outside; a thermal conductive adhesive layer 4 is provided between the first insulating substrate 3 and the first electrode sheet 2, between the first electrode sheet 2 and the ceramic heating sheet 1, between the ceramic heating sheet 1 and the second electrode sheet 2, and between the second electrode sheet 2 and the second insulating substrate 3.

[0045] In this embodiment, the ceramic heating plate 1, the electrode plate 2 and the insulating substrate 3 are connected and fixed together by curing the thermal conductive adhesive layer 4 at high temperature. The thermal conductive adhesive layer 4 can reduce the thermal resistance between the PTC heating core parts and increase the bonding force between the parts.

[0046] like Figure 1 and Figure 2 As shown, based on the above embodiment, further, the electrode sheet 2 includes an electrode sheet body 21 and a pin 22 connected to the electrode sheet body 21; the board area of ​​the insulating substrate 3 is larger than the board area of ​​the electrode sheet body 21.

[0047] In this embodiment, the surface area of ​​the insulating substrate 3 is larger than the surface area of ​​the electrode sheet body 21. It can also be understood that the insulating substrate 3 can completely cover the electrode sheet body 21, thereby ensuring the creepage distance requirements and meeting the production and processing requirements.

[0048] There are two pins 22 , which can be arranged on the same side of the electrode plate, and the pins 22 of the two electrode plates 2 are located on the same side, and the pins 22 are arranged in a strip shape.

[0049] Specifically, the electrode sheet body 21 and the insulating substrate 3 are both rectangular.

[0050] The length of the insulating substrate is greater than the length of the electrode sheet body 21 by at least 5 mm (for example, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6.0 mm, 6.2 mm, 6.5 mm, etc.).

[0051] Furthermore, the width of the insulating substrate is greater than the width of the electrode sheet body 21 by more than 5 mm (for example, 5 mm, 5.3 mm, 5.5 mm, 5.9 mm, 6.0 mm, 6.1 mm, 6.4 mm, etc.).

[0052] An embodiment of the utility model further provides a PTC heater, comprising a PTC heating core of any of the above technical solutions.

[0053] The PTC heater provided in this embodiment includes a PTC heating core, and the PTC heating core includes an insulating substrate 3, and the insulating substrate 3 includes a metal plate 31 and an insulating film 32 wrapped on at least one side of the metal plate 31. The insulating substrate 3 has good thermal conductivity and can better ensure insulation, so that the PTC heating core has high stability and high reliability; the metal plate 31 in the PTC heating core can reduce the risk of impurities piercing the insulating film 32 and causing insulation failure. Therefore, the PTC heater provided in the embodiment of the utility model has high reliability and high stability.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0055] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0056] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

Claims

1. A PTC heating core, characterized in that: include: Ceramic heating element; Electrode sheets, which are provided on both sides of the ceramic heating sheet in the thickness direction; An insulating substrate is provided on one side of each electrode sheet away from the ceramic heating sheet; the insulating substrate comprises a metal plate and an insulating film, and the insulating film is wrapped on at least one side of the metal plate.

2. The PTC heating core according to claim 1, characterized in that: The outer surfaces of the metal plates are all wrapped with the insulating film.

3. The PTC heating core according to claim 1, characterized in that: The metal plate is an aluminum plate.

4. The PTC heating core according to claim 3, characterized in that: The insulating film is a PI film.

5. The PTC heating core according to any one of claims 1 to 4, characterized in that: A back adhesive layer is provided on one side of the insulating film close to the metal plate; The insulating film and the metal plate are connected by a rolling bonding process.

6. The PTC heating core according to any one of claims 1 to 4, characterized in that: A heat-conducting adhesive layer is provided between the insulating substrate and the electrode sheet, and between the electrode sheet and the ceramic heating sheet.

7. The PTC heating core according to any one of claims 1 to 4, characterized in that: The electrode sheet comprises an electrode sheet body and pins connected to the electrode sheet body; The surface area of ​​the insulating substrate is larger than the surface area of ​​the electrode sheet body.

8. The PTC heating core according to claim 7, characterized in that: The electrode sheet body and the insulating substrate are both rectangular; The length of the insulating substrate is greater than the length of the electrode sheet body by at least 5 mm.

9. The PTC heating core according to claim 8, characterized in that: The width of the insulating substrate is greater than the width of the electrode sheet body by more than 5 mm.

10. A PTC heater, characterized in that: include: The PTC heating core according to any one of claims 1 to 9.

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