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Electric vehicle charging, charger green why can not unplug? What is the function of floating charging?
Release Time:2022-12-12
Electric vehicles are now a means of transportation that can be seen everywhere on the roads in rural areas, towns, counties and even first-tier cities. The core advantage of making it so popular is that it is cheap, whether the monthly salary is 5,000, 3,000, or even 2,000 yuan. , There is basically no pressure to choose an electric car.


The price of electric vehicles is generally relatively low. You can buy an electric vehicle at about 1,000 yuan, and its use cost is lower. Xiaoxin has calculated before that the annual cost of raising an electric vehicle is about 120 yuan, even if it is placed in all power models Among the models, this cost is also very low, and for my country's per capita disposable income of 32,189 yuan, it is affordable for everyone.

But in the process of using electric vehicles, one thing is very important, and that is to do a good job in battery maintenance. If this is not done properly, electric vehicles will face frequent battery replacement, which is not only very troublesome, but also very expensive. , The main cost of a battery for an electric vehicle, a set of 48V20AH brand batteries, the price will be about 500 yuan to 700 yuan, so it is very important to maintain the battery.


Then, if you maintain the battery, it is actually a problem of "it is not difficult for those who meet, but not for those who are difficult". Maintaining the battery is more of a kind of awareness. It can be done with a little effort. Xiaoxin will share with you the maintenance knowledge during the charging process. Point: When the electric car is charging, why can't the charger be unplugged when the charger turns green? What does floating charge do?

There are many car owners who think that the charger "red light is charging state, green is full state", but this is actually a lack of understanding of electric car chargers. In fact, when the charger turns green, the battery of the electric car is not empty. When it reaches a full state, but only at about 90% to 95% capacity, the battery will continue to charge.


The chargers are mainly two-stage and three-stage, but the chargers of electric vehicles are basically three-stage chargers, and the so-called three-stage charging mainly includes: constant current charging stage, constant voltage charging stage, and floating charging stage. stage.

The constant current charging in the first stage is reflected in the fact that the current remains unchanged during charging, and the charging power increases, which increases the battery voltage. The parameters at this time are generally 59.2V for the voltage limit and 1.8A for the current.

The second stage of constant voltage charging is reflected in the fact that when charging, the voltage remains the same, and the amount of power charged will also increase, but at this time, the voltage will not rise rapidly, and the current will gradually decrease until the battery is fully charged to about 95%. , the charger turns green. The parameters at this time are generally constant voltage 59.2V, current limit 1.8A, and the green light will jump when the current drops to 0.35A.

The third stage of floating charging is the charging after the green light is turned on. It allows the charger to maintain the floating charging voltage and charge with a small current. The floating charging voltage is 55.2V and the current is limited to 0.35A until it is fully charged, and the charger is turned off. .

After understanding the principle of the charger, you can understand why the electric vehicle charger is obviously green, but the battery is still charging. Then, at this time, do you need to unplug it immediately, and when should you unplug it?


Through the understanding of the charging process of the three-stage charger, the answer can be drawn: after the charger turns green, the plug should not be unplugged immediately. Then, the question is, when do you need to unplug it?

In fact, the current new national standard electric vehicle chargers also meet relevant standards, and some chargers also have the function of "automatic shutdown". The owner does not need to unplug the power supply. When the battery capacity is full, the charger will Automatic shutdown, cut off the power supply.

If the charger does not have the function of automatic shutdown, you can only rely on the recommended time in the manual at this time. Generally, the floating charging time of a 48V20AH battery is between 30 minutes and 60 minutes. If the weather is cold in winter, the charging efficiency is relatively low. It can be extended to 2 hours, but do not exceed 2 hours, otherwise excessive "float charging" will cause damage to the battery.

The "floating charge" when the charger turns green is useful for the battery. Therefore, Xiaoxin suggested that the third stage of the charger should be charged every time the electric vehicle is charged. However, some netizens are also curious as to what effect the floating charge has. , how it maintains the battery and prolongs the battery life, Xiaoxin also shares it with the car owner.

"Float charge" effect 1: reduce battery grid corrosion

The battery is a device that reacts with active materials to convert "electrical energy" into "chemical energy", and the battery grid is the carrier of the active material. Once the grid is damaged, the interface resistance combined with the active material will be reduced, affecting the The battery life and battery life, and the role of "float charging" is to make the corrosion of the grid in the slowest state and prolong the life of the battery.

"Float charge" effect 2: inhibit the crystallization of the battery

Crystallization is a common fault. The battery will form crystals over time. The degree of crystallinity can be understood as the aging degree of the battery, which is an irreversible existence. Crystallization will lead to a decrease in battery capacity, thus affecting the life of the battery. "Float charge" can inhibit the sulfation, that is, crystallization, caused by the active material, and play a role in prolonging the battery life.

Conclusion: When charging an electric vehicle, "floating charge" plays an extremely important role. Therefore, when the charger turns green, it is actually in the process of "floating charge". The plug should not be unplugged, it should be allowed to continue. Charge until the capacity of the battery is full. If the charger turns green, unplug the power supply. This is obviously a wrong approach, and it is also a way of harming the battery. If there is such a practice, it should be corrected.

Of course, there is also a time limit for "floating charging". If the charger is not an automatic shutdown type, it is necessary to set the timing. It cannot exceed 2 hours in winter. Usually try to unplug it between 30 minutes and 60 minutes. Avoid the loss of water and bulging of the battery due to "overcharging". If the owner can do the above, they can avoid the damage caused by the electric vehicle during the charging process and make the battery last longer.

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