Heat dissipation method
1. Conduction: Heat travels from the higher part of the object along the object to the lower temperature part, called conduction.
2. Convection: The way heat is transferred by the flow of a liquid or gas is called convection.
3. Radiation: Heat is emitted by an object in a straight line, called radiation.
Car battery cooling method
 1. Natural heat dissipation.
In the natural environment, the heat source radiates heat into the air by means of convection and radiation, which is called natural heat dissipation. For example, the previous generation of smartphones were released into the air through conduction and radiation.
 2. Heat sink heat dissipation. Such as: LED cooling / CPU cooling / north and south bridge cooling.
 3. Air cooling and heat dissipation. Such as: using a fan to force air convection, a fan on the CPU radiator, and so on.
 4. Water cooling. Such as: CPU water cooling radiator and car engine cooling.
 5. Heat pipe heat dissipation. Such as: desktop CPU heat pipe radiator and notebook CPU cooler.


 The importance of thermal management systems




      The heat-related issues of a battery are key factors in determining its performance, safety, longevity, and cost of use. First, the temperature level of a lithium-ion battery directly affects the energy and power performance of its use. At lower temperatures, the available capacity of the battery will rapidly decay. Charging the battery at too low a temperature (such as below 0 °C) may cause an instantaneous voltage overcharge, causing internal lithium and causing a short circuit. .
      Secondly, the heat related problems of lithium ion batteries directly affect the safety of the battery. Defects in the manufacturing process or improper operation during use may cause local overheating of the battery, which in turn may cause a chain exothermic reaction, eventually causing serious thermal runaway events such as smoke, fire or even explosion, threatening the life of the vehicle occupants. Safety.
    In addition, the working or storage temperature of a lithium ion battery affects its service life. The proper temperature of the battery is between 10 and 30 ° C. Too high or too low temperature will cause a rapid decay of battery life. The large size of the power battery makes the ratio of surface area to volume relatively small, the internal heat of the battery is not easy to be dissipated, and the internal temperature unevenness and local temperature rise are more likely to occur, thereby further accelerating battery attenuation, shortening battery life, and increasing users. Total cost of ownership.
     The battery thermal management system is one of the key technologies to deal with the heat related problems of the battery and to ensure the performance, safety and life of the power battery.
The main features of the thermal management system include:
1) Effective heat dissipation when the battery temperature is high to prevent thermal runaway accidents;
2) Preheating when the battery temperature is low, increasing the battery temperature, ensuring charging and discharging performance and safety at low temperatures;
3) Reduce the temperature difference in the battery pack, suppress the formation of the local hot zone, prevent the battery from decaying too fast at the high temperature position, and reduce the overall life of the battery pack.


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The role of thermal silica gel gasket
    Materials that are electrically insulated or have good thermal conductivity between batteries and between batteries and pipes are:
1) changing the contact form between the battery and the heat dissipation pipe from line contact to surface contact;
2) It is beneficial to increase the temperature uniformity between the cells;
3) It is beneficial to increase the overall heat capacity of the battery pack, thereby reducing the overall average temperature.


Battery thermal management system cooling principle
   Procter & Gamble's thermal solutions ensure that your car's battery performance is more stable, allowing your battery pack to last longer and give your battery pack the best performance.
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