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Is fast charging an invisible killer of batteries?

1


Is there a scientific basis for fast charging batteries? What are the consequences of injury?


Every battery of the same design has a "healthy charging interval", and the chemical system of fast charging batteries is specially optimized. Its "healthy charging interval" is larger than that of slow charging batteries, and the charging current it can withstand is naturally higher than Slow-charge batteries must be large.


Therefore, if you use a system-optimized fast-charge battery, its life will not be affected. However, if the slow-charge battery is forced to be used as a fast-charge battery, because the charging current exceeds the healthy charging range of the slow-charge battery, the battery will suffer relatively serious damage and its life will be greatly shortened.


Researchers and technicians have discovered after years of research that the healthy charging interval is related to two factors, one is temperature and the other is SOC (state of charge, voltage level). So just identify the healthy charging interval of each battery and perform fast charging within the range. It can be charged quickly without harming it.


2


Are there any restrictions on the frequency of using fast charging?


There is no strict limit, it depends on the user application scenario. Taxi companies have purchased electric cars and use electric cars as a means of production. They have strict requirements for charging speed, so there is no ceiling. On average, taxi users charge once or twice a day. Most car owners travel within 50 kilometers per day and generally use slow charging. For private car owners, fast charging is generally based on emergency charging.


3


Does fast charge to 80% cause less damage to the battery?


The battery has an effective volume, generally reaching 80% of the effective volume. If the battery is fully charged every time, the battery will be in a full-load working state. In the long run, the battery will be very exhausted. The final trickle part of the fast charge can be omitted, because the current will be very small at the end of the charge. Since it is not a constant voltage, At this time, the voltage will still be very large, so the final charging efficiency is very low. It is better to let the battery eat up to 80% full each time, so that the battery will be in a very healthy state. This is the same as people eating.


4


After using fast charging for 3 years, the damage to the battery is significantly greater than slow charging. Is this true?


As mentioned above, every battery of the same design has a "healthy charging interval", and the chemical system of fast-charge batteries is specially optimized, and its "healthy charging interval" is larger than that of slow-charge batteries, and can withstand The charging current is naturally larger than that of a slow-charge battery.


Therefore, if you use a system-optimized fast-charge battery, its life will not be affected. However, if the slow-charge battery is forced to be used as a fast-charge battery, since the charging current exceeds the healthy charging range of the slow-charge battery, the battery will suffer relatively large damage and its life will be greatly shortened.


5


Quick charge can’t get in the battery, the gun jumps, and other phenomena are battery problems? Does it have anything to do with piles and charging agreements?


If the fast charging fails to charge or the gun jumps, there may be many reasons, and it is also greatly affected by the charging pile, such as:


The low-voltage power supply of the charging pile is unstable, or the output voltage is too high or too low due to a fault, which will cause the gun to jump; if the charging pile cannot stably output a large current, it may cause the protection of the gun to jump.


When the fast charging starts or ends, the current needs to climb or drop quickly. If the charging pile cannot respond quickly, it may be diagnosed as a charging pile failure and the battery actively disconnects the circuit.


The fast charge battery itself, if the battery management system fails, or if the temperature of the car is too low in winter, it will not charge or the gun will jump.



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