1, battery water loss is a typical reason, which is mainly characterized by the decrease of battery capacity, which leads to the thermal runaway deformation of the positive plate and the appearance of the battery.
Repair method: pry open the top cover of electric vehicle battery, open the rubber cover and expose the exhaust port; Check whether the battery is dry from the exhaust port and replenish water if necessary. In addition, when using disposable medical syringes and secondary distilled water, attention should be paid to adding them. If not, don't add it. ?
2. "Vulcanization" of battery is a typical reason.
Solution: Use large current to charge the battery to a slightly overcharged state, control the liquid temperature not to exceed 40 degrees, and then discharge 30%, which can alleviate and eliminate several sulfidation phenomena.
3. The battery imbalance fault refers to the problem of one or more small batteries in the battery pack, which leads to the failure of other good batteries to work normally.
Maintenance method: If the battery is unbalanced, users can find a battery with the same battery capacity, voltage, self-discharge and battery internal resistance.
4. Battery short circuit is a common fault, which is caused by spontaneous discharge when the small lead block at the short circuit contacts the positive and negative electrodes, which has a great impact on battery life.
Repair method: remove the lead slag and lead block in a short distance and repair it with new isolation paper.
Matters needing attention in battery use of battery car
1. When charging for the first time, don't ride until the battery is completely dead.
Under normal circumstances, the power of new electric vehicles will not be too much or too little. When the battery car shows the last grid, it is ready to charge.
2. When charging for the first time, choose daytime charging.
Charging at night is easy to overcharge and damage the battery. It is easy to control the charging time during daytime charging, so pay attention to the time when charging.
3. When charging for the first time, make sure it is fully charged within 5~6 hours.
Because the battery of the battery car has never been charged or discharged when it is not used, the charging time should not be too long.
4. When charging for the second time, you can choose deep discharge and then charge for a long time.
This kind of charging can last for 8~9 hours or even 10 hour, so that the chemical reaction of the battery can be fully charged.
5. When charging in summer, do not put the charger on flammable objects.
If the battery car is charged for the first time in summer, the charger may generate very high heat quickly, so the charger should not be placed on flammable objects, and it is best not to be placed on the seat of the battery car to prevent fire.