Introduction to the winter maintenance of lithium-ion batteries for electric vehicles

The battery capacity has the closest relationship with the cruising range. How much influence does temperature have on battery capacity? It can be seen that when the discharge current is 100A, the battery capacity shrinks by 1.7% and 7.7% from 20°C to 0°C and then to -20°C. This means that even if the temperature is as low as -20°C, the battery can still reach more than 90% of the nominal capacity. It can be said that the influence of temperature on battery capacity is relatively small. However, this does not mean that we can ignore the impact of temperature on the battery. According to the information provided by experts, under the condition of 5A charging current, the charging time at an ambient temperature of -25°C is 63% slower than the charging time at 25°C. The battery life is also a concern. According to the information supplied by Li Peng battery, if a battery with a capacity of 3500 mAh is operated in an environment of -10°C, after less than 100 charge and discharge cycles, the power will decay sharply to 500 mAh, which is basically scrapped. In other words, in a working environment of -10°C, if the battery is charged and discharged once, the battery will be scrapped and replaced after three months. This number may be a bit exaggerated, but the low temperature does greatly shorten the life of the battery. Therefore, regarding the impact of low temperature on the battery, the conclusion is that although the low temperature environment has little effect on the discharge performance of the battery, it will seriously affect the charging performance of the battery and greatly shorten the battery life. Regarding the winter maintenance of electric vehicle lithium-ion batteries: In addition to relying on the technological advancement of lithium-ion battery factories, consumers can also use some simple methods to maintain electric vehicle batteries in winter. So how do you get started? First, pay attention to the charging method. Try not to charge the battery under low temperature conditions. The high temperature is the same. When the high temperature exceeds 30 ℃, the charging current should be increased. Second, when charging in winter, you can use the method of charging several times. When the battery is hot, you can charge more at one time. Third, maintain a fully charged state. In winter, when the battery is discharged more than 50%, the electrolyte will be in danger of freezing. Therefore, the battery should be kept above 50% of the battery in winter. Fourth, every other segment Time to start the car, charge it, don’t let the battery discharge too much, and don’t leave the electric car unoccupied for too long outdoors in winter. In this way, I believe that our lithium-ion battery electric vehicles will survive this winter safely. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Introduction to 18650 Li-ion Battery Performance