For a pure electric vehicle

Power batteries account for the highest cost

It is also a key factor affecting the battery life

And the saying that “fast charging” hurts the battery

It also allows many electric car owners to

raised some doubts

So what is the truth?

01
Correct understanding of the “fast charging” process

Before answering this question, we might as well get to know the process of “fast charging”. From inserting the gun to charging, the seemingly simple two steps hide a series of necessary steps behind it:

When the charging gun head is connected to the vehicle end, the charging pile will provide low-voltage auxiliary DC power to the vehicle end to activate the built-in BMS (battery management system) of the electric vehicle. After activation, the vehicle end and the pile end perform a “handshake” to exchange basic charging parameters such as the maximum charging power required by the vehicle end and the maximum output power of the pile end.

 After the two parties are matched correctly, the BMS (battery management system) at the vehicle end will send power demand information to the charging pile, and the charging pile will adjust its output voltage and current according to the information, and officially start charging the vehicle.

02
“Fast charging” will not damage the battery

It is not difficult to find that the whole process of “fast charging” of electric vehicles is actually a process in which the vehicle end and the pile end perform parameter matching with each other, and finally the pile end provides charging power according to the needs of the vehicle end. This is like a person who is thirsty and needs to drink water. How much water to drink and the speed of drinking water depend more on the needs of the drinker himself. Of course, the Star Charging charging pile itself also has multiple protection functions to protect battery performance. Therefore, generally speaking, “fast charging” will not hurt the battery.

 In my country, there is also a mandatory requirement for the number of cycles of power battery cells, which must be more than 1,000 times. Taking an electric vehicle with a cruising range of 500 kilometers as an example, based on 1,000 charging and discharging cycles, it means that the vehicle can run 500,000 kilometers. Normally, a private car will basically only reach 200,000 kilometers in its life cycle. -300,000 kilometers of driving range. Seeing this, you in front of the screen will still struggle with “fast charging”

03
Shallow charging and shallow discharge, combining fast and slow charging

Of course, for users who have the conditions to install home charging piles, “slow charging” at home is also a good choice. Moreover, in the case of the same display at 100%, the battery life of “slow charge” will be about 15% longer than that of “fast charge”. This is actually due to the fact that when the car is “fast charging”, the current is large, the battery temperature rises, and the battery chemical reaction is not sufficient, resulting in an illusion of full charge, which is the so-called “virtual power”. And “slow charging” because the current is small, the battery has enough time to respond, and the impact is relatively small.

Therefore, in the daily charging process, you can flexibly choose the charging method according to the actual situation, and follow the principle of “shallow charging and shallow discharging, combination of fast and slow charging”. If it is a ternary lithium battery, it is recommended to keep the SOC of the vehicle between 20%-90%, and it is not necessary to deliberately pursue 100% full charge every time. If it is a lithium iron phosphate battery, it is recommended to charge it at least once a week in order to correct the vehicle SOC value.