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PTC heating film low-temperature heating

Introduction to PTC Heating Film: The difference between PTC heating film and PI heating film lies in the heating core. In PTC heating film, the core is made of conductive ink with PTC effect and silver paste instead of steel or copper sheets, while the rest of the structure is the same as PI heating film. Based on the PTC effect, this heating film achieves self-regulating temperature control. It can start at higher power at low temperatures and automatically stops heating when the set temperature is reached. Additionally, its internal ink is designed in parallel, so even if part of the circuit is damaged, it does not affect the normal operation of the entire heating film, thereby avoiding short circuit risks and significantly enhancing safety.

  • Structure: Polyimide film PI film, conductive ink, silver paste, polyimide film PI film, double-sided tape
  • Power density: Power density < 1.2 W/cm²
  • Temperature Resistance: The working temperature of the heating film is -40℃ to 80℃, and the dry burn temperature is ≤100℃.
  • Function: Stick on the side of the battery pack to heat the battery cells through conduction.
  • Thickness range: thinnest 0.22±0.05mm
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Composition of PTC heating film

The PTC heating film preheats the batteries of electric vehicles in low-temperature environments, improving the charging and discharging efficiency and performance of the batteries, extending their service life, and addressing the problem of reduced range for electric vehicles in cold regions.

Thermosensitive materials: They are the key components of PTC heating films and have a positive temperature coefficient characteristic. Common thermosensitive materials include polyethylene oxide, microcrystalline wax, barium titanate, etc. As the temperature rises, the resistance of the thermosensitive material increases significantly, thereby limiting the current and reducing the power of the heating film, achieving a self-limiting temperature function and preventing overheating.

Conductive layer: Made of metal oxides (such as silver, nickel, etc.) or materials like silicon carbide, it has good electrical conductivity and corrosion resistance. When current passes through, electrons in the ceramic substrate move under the influence of the electric field, forming a current in the conductive layer.Ceramic substrate: Usually made of materials such as alumina and zinc oxide, it has good insulation and high-temperature resistance, serving as the basic supporting structure for PTC heating films;Film Substrate: It can serve as a carrier, providing support and protection for the heating film. Common film substrates include polyethylene terephthalate (PET) film and polyimide (PI) film.

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Automotive field

Automotive field

In battery packs and charging facilities, PI heating films are used to heat batteries, improving battery performance and charging efficiency, especially in low-temperature environments. They can effectively address the issue of reduced battery range, such as in northern regions during winter, where PI heating films are commonly used in the battery heating systems of new energy vehicles.
Healthcare field

Healthcare field

In devices such as hemodialysis machines and infusion pumps, PI heating films can be used to heat liquids or maintain a specific internal temperature of the equipment, ensuring the normal operation of medical devices and the effectiveness of treatments. For example, during the hemodialysis process, it is necessary to keep the temperature of the dialysis fluid stable, and PI heating films can provide effective heating.
Aerospace field

Aerospace field

On aircraft, satellites, and other flying vehicles, PI heating films can be used to heat critical components, such as wings and engine inlets, to prevent issues like icing and performance degradation in low-temperature, high-altitude environments. For example, in high-altitude, low-temperature flight conditions, PI heating films can provide reliable heating protection for key components of the aircraft.
Industrial sector

Industrial sector

In some industrial production equipment, such as injection molding machines and extruders, PI heating films can be used to heat barrels, molds, and other components, ensuring the smooth processing and molding of materials. For example, in the plastics processing industry, PI heating films can precisely control the heating temperature, ensuring the quality of plastic melting and molding performance.
Consumer electronics sector

Consumer electronics sector

In cold environments, PI heating films can be used to keep mobile phone batteries warm, preventing performance decline and rapid power drain due to low temperatures. For example, during winter in northern China or in high-altitude cold regions, it can improve the battery life of mobile phones. It can also defog the phone’s camera to ensure clear recording and shooting.
Home life sector

Home life sector

As a new type of underfloor heating material, PI heating film has the advantages of uniform heating, rapid temperature rise, and energy efficiency, making it environmentally friendly. Compared with traditional water-based underfloor heating, it is easier to install, space-saving, and can achieve intelligent temperature control. For example, in small apartments or places with space installation requirements, PI heating film underfloor heating is a very good choice.

Advantages of PTC heating film:

PTC heating is widely used in the automotive industry, heat transfer media, laboratory equipment, the power industry, military aerospace, healthcare, and other fields due to its unique properties, such as excellent physical strength, flexibility, weather resistance, aging resistance, and good chemical corrosion resistance.

  • High Safety: It features an automatic temperature control function. When the temperature reaches a certain value Curie temperature, its resistance increases sharply, thereby limiting the current and keeping the temperature essentially stable. This effectively prevents overheating and reduces safety hazards such as fire. During heating, there are no open flames or electric arcs, making it safer compared to traditional resistance wire heating methods.
  • High thermal efficiency: Heats up quickly, can reach a high temperature in a short time, and has a relatively high thermal conversion efficiency, generally above 70%;
  • Energy saving and environmental protection: When the temperature reaches the set value, the power decreases, reducing energy consumption to some extent and saving energy; additionally, there are no harmful gas emissions, making it environmentally friendly.
  • Long service life: The operating temperature is relatively low and stable, preventing excessive wear on the materials due to high temperatures. As a result, the service life is relatively long, reaching several thousand hours or even longer.
Up to 90%Efficiency improvement
Up to 68%Save costs
Up to 100%Increase in production