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Why does the performance of electric vehicle batteries decline in winter?

Update:03-11-2020
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Charging and discharging is a chemical process, and the […]

Charging and discharging is a chemical process, and the chemical reaction requires certain temperature conditions. In any battery, at low temperatures, the activity of the chemical substances inside will decrease to varying degrees, and the chemical reaction will slow down. Therefore, the battery capacity will decrease a lot when the weather is cold in winter. This is a normal phenomenon.

In winter, because the temperature is below 0 degrees, the battery performance of many electric vehicles is greatly reduced and the mileage is greatly reduced. Using hot water bottle + quilt can solve this problem to a certain extent. 20 minutes before using the car, fill with multiple large hot water bottles and place them around the battery, and then wrap the battery + hot water bottle with cotton blankets to reduce heat outflow. The hot water bottle should be sealed well to prevent short circuit caused by water leakage. You can also use plastic beverage bottles or water bottles instead of hot water bottles.

Note here: If it is rainy and snowy, the humidity will increase at this time, and the battery leakage current will increase. If the battery is discharged too much, it will also affect the life. You can wipe the overall appearance of the battery to keep it dry, especially the charging port. . The charging time in winter can be longer than that in summer, and try to ensure that it is more than 8 hours, but it should not exceed 12 hours. Generally, the charging time is 2 hours after turning the light.

Why is it not recommended to charge electric cars quickly

The quick charge is very harmful to the battery. Generally, the current of the built-in charger is about 1.8-2A, and the current of the rapid charging is 9-11A, so it will be very hurt. The principle of the electric vehicle fast charging station is that the general current of the fast charging station is about 9A, and the small current is almost 0.5A. But the household current is about 1.5A-2A, so because the current in the home is too low, the charging will be slow if the current is low, so the low current at home cannot be quickly charged.

The slow charging of electric vehicles often lasts for more than 6 hours, so in order to want slow charging, it is often necessary to park and charge slowly overnight. In fact, slow-charging batteries are also things that people with experience in the electrochemical industry often suggest that you do: Simply put, fast charging requires high battery quality, and the battery's reaction conditions under high current are too harsh and severe, which deviates from equilibrium. Far away, there will be a greater loss of battery life, and the safety factor will be significantly reduced, so do as little as possible when it is not necessary.

Electric cars are charged at a relatively fast rate. Of course, there is no such clear distinction between how fast is fast charging and how fast is not. AC charging generally refers to a method in which single-phase or three-phase AC power is rectified, filtered, and power factor corrected by an in-vehicle charger, and then converted into DC power with a suitable voltage, and then the power battery is charged.

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