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Whether it is a lithium iron phosphate battery or a ternary lithium-ion battery, it will be affected in low-temperature environments due to the activity of positive and negative electrode materials and the decrease in electrolyte conductivity. From the results, it can be seen that the charging time will correspondingly increase, and the battery will be more difficult to fully charge. During use, the power lithium battery pack will experience a significant increase in power outage speed. Therefore, in order to solve the above problems, engineers have developed a battery preheating system and a thermal management system. By adjusting the temperature of the battery pack, the impact of ambient temperature on its appearance can be reduced. At present, there are generally two types of pre heating methods for battery packs, namely external heating and internal heating. The former is important to improve the battery mode as soon as possible through additional heating devices, while the latter uses alternating current to directly stimulate the internal chemical substances of the battery, causing it to generate heat.

What is the use of pre heating the battery?

Battery pre heating technology is an important component of battery thermal management, aimed at quickly raising the battery temperature to the optimal operating temperature when the temperature is low. Due to the low temperature in winter, it is difficult to fully charge the batteries of electric vehicles, and it is also difficult to discharge them completely. Electric vehicles can solve the problem of reduced endurance of new energy electric vehicles in low temperature environments in winter by installing a parking heater to preheat the new energy vehicle battery pack and keep it at normal working temperature, thus preventing damage to the battery pack caused by low-temperature charging.

The important usage scenarios for battery preheating are mainly concentrated in the winter of northern cities. The important usage scenarios still include two directions, discharge and charging scenarios.

After the vehicle is left in a low-temperature environment for a period of time, starting the vehicle will result in a lower battery temperature, which seriously affects the driving experience and feeling of the vehicle. If you go to the charging station for charging at this time, it will also seriously affect the charging efficiency. Therefore, in the start-up and shutdown strategy of pre heating the battery pack, detailed temperature calibration should be carried out to achieve better usage effects, avoid wasting resources, and meet the customer's usage scenarios.

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