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Comparison of 5 charging methods of electric vehicle charger and matters needing attention

Date: 2017-06-01
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Constant current charging of electric vehicle charger constant current charging means that the battery is charged with piecewise constant current charging method, and the current is adjusted by charging device to achieve. Its main feature is that the charging method has greater adaptability, and the charging current can be arbitrarily selected and adjusted. So it can be for different condition and battery state of charge (such as battery charging, battery charging at the beginning of the used and went charging). The utility model is especially suitable for charging small batteries with long current and long time, charging batteries in series connected by most batteries, and charging the batteries with slower recovery capacity.

However, due to the charging method of charging current is too small to stage, late in the charge and the charge current is too large, so the charging time is long, the precipitation of gas, in plate impact, high energy consumption and low efficiency (less than 65%), and the whole charging process must be supervised. So, at present only the battery initial charge and long time need to use small current charging for desulphurization.

The constant current charging method should pay attention to the following items:

Because the variant of constant current charging is piecewise constant current charging, the charging current should be adjusted in time in order to avoid charging too late. Moreover, the charging current must be strictly enforced, such as the size of the charging current, the charging time, the timing of the switching current and the selection of the charging termination voltage;

The residual capacity of storage battery should be close, otherwise the charging current according to series battery residual capacity minimum selected, and when the battery sufficient should be immediately removed, and then continue to charge for large capacity battery;

The charging process, every 2 ~ 3H to detect a battery cell voltage, if the voltage has reached 2.4V should be promptly transferred to the second stage charging;

When the electrolyte temperature rises to 40 degrees, the charging current should be halved. If it continues to rise to 45 degrees Celsius, the charging current should be stopped and the charge can be continued until the temperature is below 40 degrees celsius;

The battery electrolyte density charge should conform to the requirements, and the electrolyte between the cell density difference should not exceed 0.01g/cm3;

With this method, the maintenance free batteries should not be charged.

(2) electric vehicle charger - constant voltage charging, constant voltage charging refers to each single battery with a constant voltage (usually from cell number * 2.5V) charge. The main features are: the initial charge current is quite large, battery electric potential and the electrolyte density increased rapidly, with the continuation of the charging charging current decreases, the final charge in only a very small current; short