Description:
Today, let's talk about this polyimide film that is even more valuable than gold. What makes this film so strong? Ordinary plastics become soft when heated. For example, cling film becomes soft at 110℃. However, polyimide film remains intact even at a high temperature of 400℃, and liquid helium at minus 269℃ cannot break it either. This remarkable performance stems from its molecular structure, just like how steel transforms into a fishing net. Neither high temperature nor high pressure can break it.
Now let's look at its practical applications. The foldable screen phones you touch every day have screens that can bend tens of thousands of times without cracking. This is thanks to the 0.1-millimeter-thick transparent polyimide film. The antennas in 5G base stations, the battery packs of new energy vehicles, can also use it as an insulating armor. Let me give you another piece of data. When spacecraft pass through the atmosphere, this film can withstand temperatures higher than those on the surface of the sun, protecting precision instruments.
The film heating element is a transparent amber-colored polyimide film. It is a thin and semi-transparent material with excellent dielectric strength.
The manufacturing process of polyimide heaters is similar to etched foil silicone heaters. It is a high-temperature flexible heating element with excellent dielectric properties, capable of operating in a working environment ranging from -185 degrees Celsius to 200 degrees Celsius.Compared with organic silicon heating films, PET films or ceramic electric heating films, polyimide film heater is more compact.
Generally, the optimal operating temperature range for lithium-ion battery packs is 20-35℃. Low-temperature conditions can significantly affect the performance and reliability of lithium-ion batteries in electric vehicles. For instance, it can reduce the fluidity of the electrolyte inside the battery; slow down the charge transmission speed, thereby causing a decrease in battery capacity (relevant studies show that in environments below 0℃, the charging and discharging capacity of the battery may decrease by 20% - 30%) and unstable power output, etc. Moreover, low-temperature charging and discharging cycles can cause lithium to precipitate and accumulate at the negative electrode of the battery (this reaction is irreversible), eventually forming lithium dendrites. In mild cases, this can lead to uncontrollable capacity loss; in severe cases, it can puncture the separator, causing a short circuit and triggering thermal runaway. Therefore, it is necessary to heat lithium-ion batteries in low-temperature environments.
The film heating element features high efficiency for rapid heating and excellent space utilization (the polymide film heater is usually directly attached to the surface of the battery), giving it significant advantages in battery packs with extremely limited space.
In the lithium battery packs of new energy vehicles, the polymide film heater is usually installed in three ways: on the side of the module, on the side and bottom of the module, and in the battery gap. Among these, the side installation of the module can be further divided into single-side installation and double-side installation. Under the condition of the same total power, the heating time of the three installation methods is basically the same, and it all shortens with the increase of heating power. However, the method of installing heating elements on both the side and bottom of the battery can effectively reduce the average temperature of the heating film and improve the safety of use.
Polyimide film heater can withstand most chemicals, making it an ideal material for a wide range of applications such as aerospace, medical and automotive industries.It has excellent electrical insulation properties, which is particularly important in applications involving extreme temperatures.This material is designed with a lightweight approach, making it easy to handle. It can be easily manipulated to fit various shapes and sizes, making it an ideal choice for applications with limited space.
Polyimide film heater has high flexibility and can be easily bent and shaped to fit around corners and curves, making it an ideal choice for custom-designed heating elements.
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