A PTC flexible heating sheet

Abstract

The utility model provides a PTC flexible heating sheet, which is sequentially laminated with a release layer, a backing layer, a lower insulating layer, a PTC heating layer, and an upper insulating layer from bottom to top; the PTC heating layer includes a PPTC polymer heating film, a finger electrode, and an external wiring harness, and hollow holes are evenly distributed on the PTC flexible heating sheet, and two fingers of the finger electrode extend along the non-hollow area of ​​the PTC flexible heating sheet and traverse the entire non-hollow area. The hollow holes of the PTC flexible heating sheet are of the same type as the hollow patterns of the PPTC polymer heating film, with an area smaller than that of the hollow patterns of the PPTC polymer heating film, and are contained in the hollow patterns of the PPTC polymer heating film.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric heating, in particular to a PTC heating device. Background Art

[0002] PPTC composite materials are composed of polymer as matrix and conductive filler in it. The content of conductive filler exceeds the percolation threshold. It can maintain a low resistance value at room temperature. When the temperature rises, the resistance change reacts sharply in a specific temperature range and rises sharply. The PPTC characteristics can be used as a self-limiting temperature heating material. For the rapidly developing new energy vehicles, the charging and discharging performance of the battery PACK is affected by the ambient temperature. Charging and starting in low temperature environment will cause damage to the battery capacity and cycle performance. The car will be equipped with a suitable heating element. Usually, the car starter requires a larger starting current as the temperature drops. PPTC can adapt to higher heating power at low temperatures and well adapt to the temperature control requirements of automotive power batteries.

[0003] At present, PPTC heating film has been used in new energy batteries. The PPTC heating film is attached to the surface of the PACK to play a self-limiting temperature heating role. The traditional design is prone to bubbles and hollowing when the film is attached when encountering a large heating area, resulting in uneven heating and the inability to observe the specific conditions of the heating surface. It is necessary to make targeted improvements to these problems. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a PTC flexible heating sheet for solving the problems of bubbling and uneven heat caused by the attachment of PPTC heating films in the prior art.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a PTC flexible heating sheet, characterized in that: a release layer, a backing layer, a lower insulating layer, a PTC heating layer, and an upper insulating layer are sequentially attached from bottom to top; the PTC heating layer includes a PPTC polymer heating film with a hollow pattern, a finger electrode, and an external wiring harness, and the hollow holes are evenly distributed on the PTC flexible heating sheet, and the two fingers of the finger electrode extend along the non-hollow area of ​​the PTC flexible heating sheet and traverse the entire non-hollow area. The hollow holes of the PTC flexible heating sheet are of the same type as the hollow pattern of the PPTC polymer heating film, and the area is smaller than the hollow pattern of the PPTC polymer heating film, and are contained in the hollow pattern of the PPTC polymer heating film.

[0006] Optionally, the PPTC polymer heating film is a conductive flame-retardant film layer, and the conductivity at room temperature is greater than 1S / cm; the PTC transition temperature is 60~120°C.

[0007] Optionally, the electrode is one of a silver electrode, a copper electrode, an aluminum electrode, and a nickel electrode.

[0008] Optionally, the hollow holes are in a shape of hexagon, circle or rectangle.

[0009] Optionally, the lower insulating layer and the upper insulating layer are made of PI or PET material with a flame retardant grade of V0.

[0010] Optionally, the back adhesive layer is an acrylic pressure-sensitive adhesive layer with a peel strength greater than 500 gf / in.

[0011] As described above, the utility model of a PTC flexible heating sheet and its manufacturing method have the following beneficial effects: the hollow structure design adopted by the present invention is convenient for pasting, and is not easy to generate bubbles, thereby avoiding the phenomenon of hollowing caused by bubbles left during pasting. The real-time situation of the heating surface can be directly observed. Moreover, the ventilation is good, and the temperature can be reduced faster after power failure, and the hollow design increases the softness of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is an exploded schematic diagram of a PTC flexible heating sheet structure of the present invention.

[0013] Figure 2 Shown is a schematic diagram of the structure of a PTC heating layer in a PTC flexible heating sheet of the present invention.

[0014] Component number description:

[0015] 1 Upper insulation layer

[0016] 2 PTC heating layer

[0017] 21 Finger electrode 1

[0018] 22 Finger electrode 2

[0019] 23 PPTC polymer heating film

[0020] 3 Lower insulation layer

[0021] 4 Adhesive layer

[0022] 5 Release layer

[0023] 6 External wiring harness DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0025] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner. The illustrations only show the components related to the utility model rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed arbitrarily, and the layout of the components may also be more complicated.

[0026] This embodiment provides a PTC flexible heating sheet, the structure of which is as follows Figure 1 and 2 As shown, the PTC heating layer 2 includes a PPTC film material 23 and finger electrodes 21 and 22 of a specific shape formed thereon; a hexagonal hollow pattern is formed on the PPTC film 23, and the shape and enlargement are as shown in FIG. Figure 2 As shown. The PPTC polymer heating film is a conductive flame retardant film layer, and the conductivity at room temperature is greater than 1S / cm; the PTC transition temperature is 60~120℃. The interdigitated electrodes 21 and 22 can be one of silver electrodes, copper electrodes, aluminum electrodes, and nickel electrodes. The shape of the hollow holes formed on the PPTC film 23 can also be hexagonal, circular, rectangular, etc.

[0027] The external wiring harness 6 is welded on the interdigital electrodes 21 and 22, the lower insulating layer 3 is attached to the non-electrode surface of the PTC heating layer 2, the upper insulating layer 1 is attached to the interdigital electrode surface of the PTC heating layer 2, and the adhesive layer 4 with the release layer 5 is attached to the lower insulating layer 3. The lower insulating layer 3 and the upper insulating layer 1 are made of PI or PET materials with a flame retardant grade of V0; the adhesive layer 4 is an acrylic pressure-sensitive adhesive layer with a peel strength greater than 500gf / in. Figure 1 The PTC flexible heating sheet shown has uniform hollow holes, which are of the same type as the hollow patterns of the PPTC polymer heating film, with a smaller area than the hollow patterns of the PPTC polymer heating film, and are contained within the hollow patterns of the PPTC polymer heating film to ensure insulation.

[0028] In summary, the hollow structure design adopted by the utility model is convenient for pasting, and is not easy to generate bubbles, thereby avoiding the phenomenon of hollowing caused by bubbles left by pasting. The real-time situation of the heating surface can be directly observed. Moreover, the ventilation is good, and the temperature can be reduced more quickly after power failure. Moreover, the hollow design increases the softness of the material. Therefore, the present invention effectively overcomes the shortcomings of the prior art and has a high industrial value.

[0029] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A PTC flexible heating sheet, characterized in that: From bottom to top, a release layer, a backing layer, a lower insulating layer, a PTC heating layer, and an upper insulating layer are sequentially laminated; the PTC heating layer includes a PPTC polymer heating film, an insert finger electrode, and an external wiring harness; hollow holes are evenly distributed on the PTC flexible heating sheet; two insert fingers of the insert finger electrode extend along the non-hollow area of ​​the PTC flexible heating sheet and traverse the entire non-hollow area; the hollow holes of the PTC flexible heating sheet are of the same type as the hollow pattern of the PPTC polymer heating film, have a smaller area than the hollow pattern of the PPTC polymer heating film, and are contained in the hollow pattern of the PPTC polymer heating film.

2. A PTC flexible heating sheet according to claim 1, characterized in that: The PPTC polymer heating film is a conductive and flame-retardant film layer, and its conductivity at room temperature is greater than 1S / cm; and its PTC transition temperature is 60-120°C.

3. A PTC flexible heating sheet according to claim 1, characterized in that: The electrode is one of a silver electrode, a copper electrode, an aluminum electrode and a nickel electrode.

4. The PTC flexible heating sheet according to claim 1, characterized in that: The shape of the hollow holes is hexagonal, circular or rectangular.

5. The PTC flexible heating sheet according to claim 1, characterized in that: The lower insulating layer and the upper insulating layer are made of PI or PET materials with a flame retardant grade of V0.

6. The PTC flexible heating sheet according to claim 1, characterized in that: The back adhesive layer is an acrylic pressure-sensitive adhesive layer, and the peeling strength is greater than 500 gf / in.

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