Why does the discussion table of electric vehicles show that the power is blank and keeps flashing! Everything else is normal! How to fix it, please

This is a reminder that the power is decreasing and it is necessary to charge it in time.

1, caused by deep power failure of the electric vehicle, I suggest you charge it continuously 12 hours. If not, activate it with a charger with the same voltage of 20AH.

2. If the charger starts to flash before the battery is plugged in, it is the charger's own problem and needs to be replaced after sale (free of charge within one year).

The deformation of the battery is not sudden, but often has a process. When the battery is charged to 80% capacity, it will enter the high-voltage charging area. At this time, oxygen will first precipitate on the positive plate, and reach the negative electrode through the small holes in the separator, where oxygen revival reaction will be carried out: 2Pb+O2 (oxygen) = 2Pb 0+Q (heat).

PbO+H2SO4=PbSO4+H2O+Q (heat). Heat will be generated during the reaction. When the charging capacity reaches 90%, the oxygen production speed is accelerated and the negative electrode begins to produce hydrogen. With the increase of a large amount of gas, the internal pressure of the battery exceeds the valve pressure, the safety valve opens, the gas escapes, and finally it shows water loss. 2H2O=2H2↑+O2↑ With the increase of battery cycle times, the water content gradually decreases, resulting in the following conditions of the battery:

(1) The oxygen "channel" becomes unobstructed, and the oxidation generated by the positive electrode can easily reach the negative electrode through the "channel".

⑵ The heat capacity decreases, and the largest heat capacity in the battery is water. After losing water, the heat capacity of the battery is greatly reduced, and the generated heat makes the battery temperature rise rapidly.

⑶ Because the superfine glass fiber separator in the battery shrinks after losing water, the adhesion between it and the positive and negative plates becomes worse, the internal resistance increases, and the calorific value increases when charging and discharging. After the above process, the heat generated inside the battery can only be dissipated through the battery tank. If the heat dissipation is less than the calorific value, the temperature will rise.

With the increase of temperature, the overpotential of gas evolution decreases and the gas evolution rate increases. A large amount of oxidation of the positive electrode passes through the "channel" and reacts on the surface of the negative electrode, releasing a large amount of heat, causing the temperature to rise rapidly, forming a vicious circle, which is called "thermal runaway".

Refer to the above content: Baidu Encyclopedia-Electric Vehicle Charger