Charging at low temperature will induce lithium deposition, and in severe cases, it may even penetrate the separator and cause internal short, resulting in an explosion. Therefore, battery preheating techniques are key means to improve the performance and lifetime of lithium-ion batteries in cold climates.
When the battery temperature reaches the fast-charge temperature (20 °C in this study), the batteries can be switched to supercharge mode and charged by a high current. Therefore, preheating can increase the temperature of batteries quickly and enable the battery system switch to supercharge mode as fast as possible.
Because the current is small in trickle mode, temperature of the battery rises slowly. Even when the batteries are preheated to 0 °C and 10 °C, the temperature of the batteries is still below 20 °C during the charge process. The battery system cannot switch to super-charge mode if the batteries'' temperature is lower than 20 °C.
The temperature difference inside the battery is reduced to 5 °C by pulse heating. The preheating strategy reduces the charging time of the battery system by 72 %. The electrochemical performance of lithium batteries deteriorates seriously at low temperatures, resulting in a slower response speed of the energy storage system (ESS).
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