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Polyimide Film Heater For Lithium Battery

Polyimide Film Heater For Lithium Battery
Polyimide film heater is made of Polyimide film as the outer insulator of the heater. With metal foil, and metal wire as an internal conductive heating body, through high temperature and high-pressure heating.
Excellent insulation strength; Excellent electrical strength; Excellent heat conduction efficiency; Excellent resistance stability.
This enables it to be widely used in the heating field and to obtain quite a high-temperature control accuracy.

Polyimide film heater features:

  • A variety of thicknesses
  • Very soft
  • The modified PI film has better thermal conductivity, and its structure is composed of polyimide film and resistance sheet by hot pressing at high temperature
  • According to the need to customize various power, specifications, size, installation of products, covering the heating body use
  • The resistance sheet is etched according to the design resistance value, and the heating uniformity is good
  • It can be customized according to shape, size, power, and voltage requirements
  • It can be easily integrated with thin insulation material to provide a lightweight heating element with an insulation layer
  • Optional single-sided adhesive for quick installation

Polyimide film heater applications:

  1. New energy vehicle battery industry
  2. Communication security industry
  3. The camera
  4. Hard disk video recorder
  5. The power industry
  6. Military and aerospace
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery

Polyimide Film Heater For Lithium Battery

With the rapid development of the new energy vehicle industry, some of its potential problems have begun to emerge. For example, when an electric vehicle runs in a low-temperature environment, the performance of its main components such as the power battery and motor appears power failure.
In the promotion process of electric vehicles, the range, charging time, and safety of use are mainly restricted by the characteristics of power batteries.
The characteristics of lithium-ion power batteries are significantly affected by the ambient temperature, especially in the low-temperature environment, where the available energy and power decay are more serious, and long-term use in the low-temperature environment will accelerate the aging of power batteries and shorten their service life.
Commonly used electric vehicle lithium-ion power battery at -10℃, the capacity and working voltage will be significantly reduced, at -20℃ performance is even worse, showing that its available discharge capacity plummets, and can only maintain at room temperature of about 30% of the capacity.
 
The lower the temperature, the greater the drop in the initial voltage of the power battery. As the temperature decreases, the impedance of the power battery increases, which leads to the increase of the partial pressure of the battery's internal resistance, so the terminal voltage of the battery decreases.
At the beginning of low-temperature discharge, the terminal voltage of the power battery rises, which is mainly caused by the heat generation of the power battery during discharge.
At low temperatures, with the increase of discharge rate, the power characteristics and capacity characteristics of the power battery are attenuated.
The decrease of the solid-phase diffusion coefficient of lithium-ion in negative graphite is also one of the main factors leading to the poor performance of power batteries at low temperatures.
The decrease of the solid-phase diffusion coefficient of lithium-ion in negative graphite at low temperatures is the main velocity control step leading to the deterioration of capacity characteristics of the power battery. When the battery is charged at a low temperature, the small diffusion coefficient will lead to the obstruction of the diffusion process of lithium-ion in the negative electrode graphite, which is easy to produce "lithium deposition" on the surface of the negative electrode particles, causing long-term damage to the battery.
 
As the temperature decreases, the constant current charging time of the power battery will be shortened, while the constant voltage phase charging time will be prolonged, and the total charging time will be longer. In the set charging mode, the amount of charge in the constant voltage phase of the power battery will increase as the temperature decreases. This resulted in a lower temperature, therefore, power battery charging with constant current power cuts, relies mainly on constant voltage to charge, for a long period of time constant voltage charging stage leads to overall power battery charging time extension, reduce charging time efficiency, and a long time of low-temperature constant voltage charging is power battery leads to side effects of a factor for performance attenuation.
 
It is not only difficult for power batteries to discharge at low temperatures but also due to the increase of battery impedance, the charging voltage rises rapidly and the time for the battery to reach the charging protection termination voltage is shortened. Therefore, it is difficult to charge and the charging efficiency is low.
However, with the decrease of the ambient temperature, the discharge voltage of the battery shows a rapid downward trend, and the power characteristics of the power battery deteriorate. With the decrease in the temperature, the time for the power battery to reach the cutoff voltage is shortened, indicating that the available capacity of the power battery is seriously attenuated. Therefore, this is the main reason for the design of the heating material in the 18650 lithium battery.
 
Low-temperature environments, lithium-ion battery charging is difficult, and when charging it's negative and easy to accumulate on the surface to form lithium metal. The growth of lithium dendrites will Pierce the battery diaphragm and cause a short circuit inside the battery, which will not only cause long-term damage to the battery but also induce thermal runaway of the battery, resulting in greatly reduced safety of its use. To solve this technical problem, PI heating sheet material can be added to the 18650 lithium battery. PI film heating sheets can be customized with different sizes in different areas to meet different heating power and temperature requirements. When the battery is in a low-temperature environment, the temperature distribution on the battery heating surface can be realized. Let the battery surface maintain thermal energy, reduce the battery aging, shorten the service life, and improve the safety of the battery
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery
Polyimide film heater for lithium battery

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