According to a report released by fleet management company Geotab after investigating 6,300 electric vehicles, it can be seen that the use of DC fast charging and air conditioning will accelerate the loss and aging of electric vehicle power batteries. Like many moving parts on fuel vehicles, EV power batteries are not sustainable. If you often rely on DC fast charging and air conditioning systems, the battery will age much faster.
(Photo from: GM Motors, via Cnet)
On average, the annual loss of EV batteries is 2.3%. If the nominal life of an EV car is 150 miles, then the loss in five years is about 15 miles.
However, many factors, including the use temperature, will have an impact on the health of the battery, especially the DC fast charging and the cooling scheme designed by the manufacturer.
For EV owners with mileage anxiety, DC fast charging is their preferred charging solution. If connected to 240V (level 2) or 120V (level 1) mains, the car will need several hours of charging waiting time.
The study found that under L2 and L1 charging schemes, EV power battery losses are almost negligible. But as the frequency of DC fast charging increases, the attenuation of the power battery becomes more obvious.
(From: Geotab)
Research indicates that this phenomenon may be related to high current and high temperature during fast charging. For any type of battery, these two factors are extremely unhealthy.
In view of this, if you want to maximize the life of the EV power battery, it is best to use L2 charging instead of DC fast charging.
In terms of battery thermal management, there are also big differences between air-cooled and liquid-cooled solutions. For example, the 2015 Nissan Leaf uses a passive air cooling mechanism, and the battery decay rate reached 4.2% after one year.
As a comparison, the same 2015 Tesla Model S, its battery attenuation is only 2.3%-it can be seen that high temperature will accelerate the degradation of the battery.
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