How to repair the broken battery of electric vehicle?

For vulcanized batteries, the battery can be discharged first, the original electrolyte is poured out, and a thinner electrolyte with the density below 1. 10g/cm3 is injected, that is, water is added to the battery to dilute the electrolyte, so as to improve the solubility of lead sulfate. When the current rate is less than 20h and the liquid temperature is less than 20℃ ~ 40℃ for a long time, the general vulcanization phenomenon can be alleviated, and the capacity can be restored to more than 80%, which can be considered as successful repair.

2. Shallow-cycle high-current charging method: For the vulcanized battery, use the current with a high current rate of 5 hours, charge the battery to skip charging state, control the liquid temperature not to exceed 40 degrees, and then discharge 30%. If this is repeated several times, the vulcanization phenomenon can be alleviated and eliminated. The mechanism of this method is that the sulfide salt on the surface of the electrode plate is slightly washed by the gas discharged from overcharge, so that it is desorbed and dissolved and converted into active substances.

3. Pulse repair: For the vulcanized battery, some special pulse repair instruments can be used to charge and discharge the battery for many times to eliminate the vulcanization phenomenon. The mechanism of this method is that from the point of view of solid state physics, any insulating layer can be broken down at a sufficiently high voltage. Once the insulating layer is broken down, it will change from an insulating state to a conductive state.

Extended data:

Battery maintenance of electric vehicles;

1. Overcharging of the battery produces a large amount of gas to wash the electrode plate, which accelerates the shedding of active substances on the electrode plate and shortens the battery life.

2. Overcharging the battery will accelerate the water loss, which will lead to the drying of the electrolyte and the increase of the battery temperature, which will lead to thermal runaway, plate expansion and shell deformation.

3, to prevent large current discharge, start, uphill, headwind, try to use your feet to assist. ?

4, to prevent long-term discharge, don't often run after discharge. Charge when the power drops 1/2.

References:

Baidu Baike electric vehicle battery