Graphene variable current electrothermal film

Abstract

Disclosed are a graphene variable current electrothermal film and a manufacturing method thereof. The graphene variable current electrothermal film comprises heat generating units. Each of the heat generating units comprises a carbon heating zone and a silver paste current-carrying strip that are disposed on a first base film and a copper foil current-carrying strip disposed on a second base film,the carbon heating zone is disposed in the middle of the first base film, and the silver paste current-carrying strip is disposed around the carbon heating zone and electrically connected with the carbon heating zone; the first base film covers the second base film, the copper foil current-carrying strip is crimped on the silver paste current-carrying strip and electrically connected with the silver paste current-carrying strip, and the copper foil current-carrying strip is disposed on both sides of the carbon heating zone; and the first base film and the second base film are bonded togetherthrough a hot melt adhesive layer. A cutting partition region is disposed between the adjacent two heat generating units. Each copper foil current-carrying strip comprises a cathode copper foil current-carrying strip and an anode copper foil current-carrying strip, and the cathode copper foil current-carrying strip and the anode copper foil current-carrying strip are respectively disposed on the left and right sides of the carbon heating zone. The invention has the characteristics of high safety performance.

Description

technical field [0001] The invention relates to a graphene variable current electrothermal film and a manufacturing method thereof. Background technique [0002] At present, the common carbon crystal electric heating film has a width of 50-100cm, and its electric conversion efficiency is high. It is widely used in the electric heating industry. It belongs to the carbon element that distributes capacitance through Brownian motion to generate heat. The common positive temperature coefficient electric heating film is made by arranging printed conductors-carbon heating elements and silver paste in parallel on the polyester film PET. The input current realizes heat generation. At present, there are the following problems: 1) When the electric heating film is working, the carbon wire heats up and the resistance increases with the temperature rise, but the current heating film carbon wire is longer and the covering object cannot be completely covered, and the temperature of the sa...

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Problems solved by technology

At present, there are the following problems: 1) When the electric heating film is working, the carbon wire heats up and the resistance increases with the temperature rise, but the current heating film carbon wire is longer and the covering object cannot be completely covered, and the temperature of the same carbon wire is higher. Resistance Large areas with no coverage have small resistance. Under relatively uneven conditions, carbon wires with large resistance values ​​will generate more heat, and prolonged heating will cause safety hazards; 2) The disadvantage of this connection method of busbar copper foil busbars is that the power is turned on and off instantaneously. The current impact generated at the direct connection part is large, and the leakage current generated comprehensively is also large. Long-term use is easy to cause local leakage at the connection part, which is not good for the safe and stable use of the electrothermal film; 3) This electrothermal film is made of carbon black The far-infrared heating ink uses the form of distributed capacitance to adjust the heating value and power through the size of the resistance. Under the same power condition, the electric heating film has a lower voltage and the current increases correspondingly. Wider heating film; 4) The length of the heating carbon wire of this heating film is 45cm to 95cm, and the resistance becomes smaller and the current increases when the power is equal. If the carbon wire is damaged, it is very easy to generate electric sparks and cause danger; 5) This When the electric heating film is working, the power is relatively constant in any situation and will not change correspondingly for different environments. Once partial coverage occurs, it will easily cause serious consequences. The same series coverage resistance will have higher heat. For example, in the steam room accident, it is very likely to be The electric heating film is laid on the wall above the heat accumulation to form a local loss

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