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What should be paid attention to when charging new energy vehicles

Release time：

2023-05-10 13:36

The sales consultant for new energy vehicles stated that when charging, car owners should follow the principle of frequent charging and shallow discharging. In terms of charging frequency, it is necessary to maintain the battery in a fully charged state and not wait for the battery's charge to be below 20% before charging. Excessive discharge will cause the positive and negative active substances inside the battery to gradually convert into resistors, thereby wasting the battery's service life.
The sales consultant suggests checking the remaining battery before leaving. The instrument panel shows that you need to find a charging station with a remaining range of about 50 kilometers. It is best to double the "life saving" range in winter to prevent the temperature from being too low to discharge the battery.
So, regarding the lifespan of the battery, is fast charging better or slow charging better? The sales consultant stated that in theory, frequent fast charging can cause certain damage to the battery compared to slow charging, as fast charging uses currents that are several times or even tens of times higher than the standard for charging.
If fast charging is frequently used, it will accelerate the polarization of the battery cell, leading to lithium evolution. During the lithium evolution process, lithium ions will decrease, ultimately leading to a decrease in battery capacity and affecting battery life. However, except for the lithium iron phosphate battery, the lithium metal will change back to lithium ion and the critical temperature will return to normal after the battery has a short rest after fast charging. However, frequent fast charging can still reduce the battery's restoring ability. Therefore, in order to ensure that new energy vehicles can better solve the range, car owners can choose the approach of "daily slow charging and emergency fast charging".
In addition, lithium-ion batteries are relatively delicate and not sensitive to temperatures ranging from 0 ℃ to 40 ℃. If the temperature changes below 0 ℃ or above 40 ℃ during charging and discharging, the cycle life and capacity of lithium-ion batteries will be lower than normal values. The larger the temperature range, the more capacity and life will be reduced. For example, when it comes to winter, especially in colder regions in the north, the battery life of mobile phones is much shorter than that in summer. This is related to temperature changes, not the reason why mobile phone batteries are not durable.