Why doesn’t the electric vehicle park at home and the battery runs out?
Why doesn't the electric vehicle park at home and the battery runs out?
1. The characteristics of the battery affect, but the impact is minimal.
The battery itself will produce self-discharge, of course, this factor has minimal impact, such as a 12V series battery, the voltage after being fully charged is generally not less than 13.20V, if the battery is not installed on the car, it is only stored statically, even if stored 2 months, its static voltage will not be lower than 12.90V (conservative value).
2. The leakage of electric vehicles should not be underestimated.
Regardless of whether the electric car is old or new, no matter how good the insulation effect is, this phenomenon is common. Electric cars cannot be 100% insulated, so even if the power lock is turned off, there will be a small current through the electric car. Use a highly accurate ammeter In series test, most vehicles will have a current of at least 0.01A. This means that when the electric vehicle is not riding, it also discharges every moment, and it varies with the ambient temperature and temperature. In addition, electric vehicles are becoming more and more intelligent, and devices such as anti-theft and positioning consume power all the time. Assuming that the 12Ah battery is calculated according to the storage period of 15 days, 0.015A×24 hours×15 days=5.4Ah, indicating that at least 5.4Ah of capacity has been lost due to electric vehicle leakage in 15 days, which should not be underestimated. The accuracy of the ammeter used daily is not high. If the value is not displayed during the test, it is very easy to be ignored.
3. Improper use and storage methods of daily electric vehicles have a great impact.
Electric cars are everyday items for everyone, and many little friends do not fully charge and store them after riding. If it is not used for 1-2 months during the epidemic, the result is very worrying. For example, if we use 50% of the electric cars for 1 month, then 0.015A×24 hours×31 days=11.16Ah, isn’t it? amazing? The unlocking current of a generally good brand electric car is about 0.1A. If the power of the electric car has been turned on and the key has not been removed, one can imagine how much electricity will be leaked in one month (0.1A×24 hours×31 days= 74.4Ah), so scary! More importantly, "over-discharged" batteries are not within the scope of the after-sales guarantee, and the repair rate is low. and so
When the electric car is parked for a long time, it must be fully charged and stored! And at least 7-15 days to add electricity once. New batteries that are not installed in the vehicle must be fully charged for long-term storage! And at least 2 months to add electricity.