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Electric Vehicle Requirements for Charging Station

Release time:

2024-06-27

The future charging station should be able to meet the following points according to the characteristics of the battery and the requirements of the battery:

The future charging station should be able to meet the following points according to the characteristics of the battery and the requirements of the battery:

(1) For batteries that have been fully discharged, they should be charged with a large current at the beginning of charging to achieve rapid speed. In the first 15min of fast charging, 50% ~ 80% of the total capacity can be charged.

(2) In order to achieve fast and high efficiency, the charger should adopt a pulse circuit.

(3) Charging to a certain extent, that is, when the battery is charged to a certain turning point, the current should be reduced in a timely manner.

(4) In order to prevent the polarization and gas generation of the polar plate during the charging process, and reduce the charging efficiency, decompose and concentrate the electrolyte, and heat and vulcanize the polar plate, negative pulses should be added in a timely manner to eliminate polarization. When the depolarization is completed and determined to produce a predetermined effect, and the battery plate has been restored to the original good state of charge, the discharge should be automatically stopped and automatically transferred to the state of charge again.

(5) The generation of negative pulses should not only be timely, but also moderate in intensity, not excessive or weak. To this end, the circuit should have a detection function. When the depolarization is not effective, the discharge should be supplemented until the polarization phenomenon is completely eliminated.

(6) The charger circuit should have the function of automatically detecting and controlling the charging voltage, and its very final voltage should not exceed the charging termination voltage specified by the battery.

(7) Constant current is relative and constant voltage is effective. This not only describes the charging process, but is also an effective requirement for the very late stage of charging. The voltage must be based on the charging and discharging termination voltage of the battery. In the very later stage of charging, the charging current is terminated very later because the gap between the charger voltage and the battery voltage is getting smaller and smaller. Therefore, the very high voltage limit of the charger should be very accurate, and only under the very high limit can the current be gradually reduced. When charging to the turning point of this type of battery, the current must be adjusted immediately. At a very late turning point, the charger should be able to automatically switch to very small current charging, which is commonly referred to as trickle mode. The trickle is still pulse width modulated, but the duty cycle is much smaller. The trickle of lead-acid batteries should be below C/16.

(8) After the charging reaches the specified charging end and the trickle fine charging is completed, the battery plates in the battery pack are completely restored, each battery pack is balanced with each other, and the charger can automatically cut off the power supply to stop charging.

(9) In terms of display: there are power supply, charging, each stage status display, charging power display, etc.

(10) reverse, short circuit protection.

(11) The temperature drift is small, the voltage temperature coefficient of the device is low, and the voltage is not unstable due to changes in ambient temperature. This is the condition to ensure the accuracy of the final voltage.

(12) electric vehicle charger circuit clutter, harmonics to meet the requirements, not allowed to stray, harmonic feedback grid.

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