Will temperature changes affect the performance of electric vehicle lithium-ion batteries?
Temperature changes will directly affect the charging and discharging performance of lithium-ion batteries in electric vehicles, but many electric vehicle users will not pay attention to this when using lithium-ion batteries in electric vehicles. From the current test results of lithium-ion battery manufacturers, the ambient temperature is too high or too low, which has a significant impact on the characteristics of the lithium-ion battery, which is manifested in the voltage drop and insufficient capacity. It is best to control the temperature between 10-50 degrees. , There must be insulation measures.
In fact, in the process of charging and discharging lithium-ion batteries for electric vehicles, chemical reactions will occur, and this reaction will increase or decrease the activity of active materials on the battery. The lower the discharge temperature, the less capacitance will be released. The higher the charging temperature, the higher the acceptability, so the charging voltage is fixed, so that it can be fully charged.
The temperature's influence on the lithium-ion battery of electric vehicles will be more or less, and the focus is on daily maintenance. High temperature will cause electric vehicles to ignite spontaneously. This statement is wrong. However, there is no direct relationship between high temperature in summer and the spontaneous combustion of electric vehicles.
When we talk about the spontaneous combustion of electric vehicles, we associate it with batteries. Because the battery will produce a lot of heat during the charging and discharging process, if the internal temperature of the lithium-ion battery of an electric vehicle continues to rise or the temperature between the single cells is uneven, there will be a risk of overheating and burning and explosion.
According to the information provided by experts, under the condition of a charging current of 5A, the charging time at an ambient temperature of -25ˇăC is 63% slower than the charging time at 25ˇăC. The influence of low temperature on the charging time of lithium-ion batteries cannot be ignored. Excessive charging time will seriously hinder the promotion of electric vehicles. Although the low temperature environment has little effect on the discharge performance of lithium-ion batteries, it will seriously affect the charging performance of the battery and greatly shorten the life of the battery.
The influence of temperature on discharge performance is directly reflected in discharge capacity and discharge voltage. The temperature decreases, the internal resistance of lithium-ion batteries increases, the electrochemical reaction speed slows down, the polarization internal resistance increases rapidly, and the battery discharge capacity and discharge platform decrease, which affects the power and energy output of electric vehicle batteries.
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