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In winter, the range of lithium-ion batteries in electric vehicles will decrease, which is mainly due to several reasons. Firstly, there is a certain relationship with the internal electrodes and electrolytes of the battery. As for the power lithium-ion battery of electric vehicles, when the temperature is relatively low, the active substance of the positive electrode material is lower, and its activity is worse. The electrochemical characteristics inside the battery will quickly reduce the activity of the battery, This leads to an increase in internal resistance within the battery.

All lithium ions inside a lithium-ion battery are stored in the positive electrode, while the negative electrode is composed of graphite (carbon). Between the positive and negative poles, there is an electrolyte and a separator. The discharge process of lithium-ion batteries is the movement of lithium ions from the negative electrode to the positive electrode, and the discharge of lithium-ion batteries provides the necessary electrical energy for the operation of electric vehicles.

In the case of a decrease in temperature, the speed of this charging and discharging process will slow down. Therefore, the discharge current decreases, and the capacity of the battery also decreases. The marked working temperature of lithium-ion batteries is 0-40 ℃, but in reality, when the temperature is below 25 ℃, there will be a certain degree of performance degradation: reduced battery capacity, slower discharge speed, and reduced battery output power.

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