Electrothermal film

An electric heating film and heating core technology, applied in electric heating devices, ohmic resistance heating, ohmic resistance heating parts and other directions, can solve the problems of reduced high temperature life in the middle, overheating and burning of the central part, etc., to prolong the service life and prevent local temperature. The effect of too high and small power attenuation

Pending Publication Date: 2021-07-23
CHANGZHOU CHANGQING TRAFFIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the electrothermal film is planar, the heat dissipation speed of each part is different, so the phenomenon of overheating in the central part and low temperature around it is common, which may easily cause the high temperature life of the central part to be reduced or even burnt out.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] See figure 1 , The electrothermal film in this embodiment 1 includes an outer cladding layer 1 , a heating core layer 2 and an electrical connection sheet assembly 3 .

[0031] The coating outer layer 1 is composed of an upper surface layer and a bottom layer, both of which are made of PET (PET is the abbreviation of Polyethyleneterephthalate in English, referred to as PET or PETP) or PI (PI is the abbreviation of Polyimide in English, PI is commonly known as polyimide in Chinese, It is made of aromatic heterocyclic polymer compound with imide group chain link in molecular structure) or epoxy resin material. When polyimide is used, it has better high temperature resistance and is suitable for occasions with high fire protection requirements. use. Corresponding parts of the upper surface layer are fixed on the bottom layer and the heating core layer 2 through hot-melt adhesive thermocompression bonding from top to bottom. The heating core layer 2 is wrapped between the...

Embodiment 2

[0036] See figure 2 , the rest of this embodiment is the same as Embodiment 1, the difference is that: the conductive cross-sectional area of ​​the heating part 2-3 is gradually reduced from the inside to the outside, and according to the formula P=I²R, the current in series is the same, and the metal strip per unit length The smaller the conductive cross-sectional area, the greater the resistance and the greater the power. The distance between the parallel adjacent parts of the heating part 2-3 is gradually increased from the inside to the outside. According to the temperature difference between the periphery and the center of the electrothermal film in the working state, it is determined that the periphery needs to be increased and the central part needs to be reduced. The heating power can make the surface temperature of the electrothermal film more balanced under the condition that the overall power remains unchanged.

Embodiment 3

[0038] See image 3 , the rest of this embodiment is the same as that of Embodiment 1, the difference is that: the heating part 2-3 includes an inner heating part 2-31, an inner ring heating part 2-32 and an outer ring heating part 2-33. The inner heating part 2-31, the inner ring heating part 2-32 and the outer ring heating part 2-33 are connected in parallel on the positive electrode connection part 2-1 and the negative electrode connection part 2-2. The inner heating part 2-31, the inner ring heating part 2-32 and the outer ring heating part 2-33 are arranged sequentially from the inside to the outside, the inner ring heating part 2-32 is arranged around the inner heating part 2-31, and the outer ring heating part 2 -33 is set around the inner ring heating part 2-32. The conductive cross-sectional area of ​​the inner heating part 2-31, the inner ring heating part 2-32 and the outer ring heating part 2-33 is set to gradually increase. According to the formula P=I²R, the cur...

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PUM

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Abstract

The invention discloses an electrothermal film. The electrothermal film is characterized by comprising an outer coating layer, a heating core layer and an electric connection sheet assembly. The outer coating layer is composed of an upper surface layer and a bottom layer, and the heating core layer is wrapped by the outer coating and located between the upper surface layer and the bottom layer of the outer coating. The heating core layer is formed by laying conductive heating strips, wherein the head and the tail of each conductive heating strip are respectively provided with a positive electrode connecting part and a negative electrode connecting part, and the part, between the positive electrode connecting part and the negative electrode connecting part, of each conductive heating strip is a heating part. Distances between parallel adjacent parts of the heating parts are gradually reduced from inside to outside. The electric connection sheet assembly comprises a positive electric connection sheet and a negative electric connection sheet, wherein the positive electric connection sheet and the negative electric connection sheet are made of metal conductive materials; the positive electric connection sheet is fixedly and electrically connected to the outer coating layer and is electrically connected to the positive electrode connecting part; and the negative electric connection sheet is fixedly connected to the outer coating layer and is electrically connected to the negative electrode connecting part.

Description

technical field [0001] The invention relates to the technical field of electrothermal film, in particular to an electrothermal film used in electric heating systems such as floors, walls, ceilings, seats, and vehicle floors. Background technique [0002] The electric heating film in the electric heating heating system is a film product that can generate heat after being energized. It is made of conductive materials such as conductive special ink and metal bus bars, which are processed and packaged between insulating films. It belongs to the low-temperature radiation electric heating film. The electric heating film sends heat into the space in the form of radiation, making the human body feel warm, and its comprehensive effect is better than the traditional convection heating method. The heating system usually consists of power supply, thermostat, connectors, insulation layer, electric heating film and finishing layer. The power supply is connected to the electric heating fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/26H05B3/06H05B3/00H05B3/02H05B3/12
CPCH05B3/0014H05B3/02H05B3/06H05B3/12H05B3/267
Inventor 周文舟周银妹刘俊朱其朋李群力
Owner CHANGZHOU CHANGQING TRAFFIC TECH
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