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Article from：luru 28-06-2020
Discharge fever Discharge fever is mainly caused by: the discharge is too fast, there may be a small battery capacity, and the discharge current exceeds 0.5C for a long time.
1) When the rated voltage of the motor is low, the battery capacity is small, and the operating current is too large, the voltage will drop sharply, and the capacity will be quickly consumed, which is harmful to the battery.
2) The electrochemical reaction speed of the battery can only maintain driving, and it is often charged and discharged through the full cycle. When facing uphill, the power consumption is very large, forcing the battery plate to react rapidly, and the heat of the battery casing is high, which will damage the battery and shorten the life.
3) It is ideal that the electrochemical reaction speed of the battery sufficiently supplies sufficient electric energy. The battery case has no abnormal heat, indicating that the battery capacity is sufficient.
In recent years, there have been frequent occurrences of electric vehicles overheating or even catching fire. So, how can we avoid it? How can we ensure that the electric car battery heat dissipation in time?
1 The charging environment should be ventilated and cool
The charging environment in summer is to find a low temperature environment, and the charging environment is close to 25°C. The battery is a chemical. Of course, the chemical reaction requires a temperature. 25℃ is the standard reaction temperature.
Secondly, the charging parameters of the charger should also be adjusted accordingly. The voltage should be reduced in summer and increased in winter. The requirement is that the voltage and temperature have a relationship of -4mv, that is, the temperature increases by one degree and the voltage decreases by 4mv.
2 Check the battery regularly
Due to the high temperature in summer and a relatively high incidence of accidents, during the use process, if the continuous mileage of the electric vehicle suddenly drops by more than ten kilometers in a short time, it is likely that at least one battery in the battery pack has broken. Short-circuit phenomena such as grid, plate softening, and plate active material falling off. At this time, you should go to the professional battery repair organization for inspection, repair or grouping in time to prevent a larger accident.
3 master the charging time
Under normal circumstances, the battery is charged at night, the average charging time is about 8 hours. If it is a shallow discharge (the driving distance is very short after charging), the battery will be fully charged soon, and overcharging will occur when charging continues, causing the battery to lose water and heat, and reduce the battery life. Therefore, it is better to charge the battery once when the depth of discharge is 60%-70%. In actual use, it can be converted into riding mileage, and the necessary charging is carried out according to the actual situation to avoid harmful charging. In summer, due to the hot weather, charging for too long may cause a fire.
4Prevent high temperature exposure
Electric vehicles are strictly prohibited from being exposed to sunlight. An excessively high temperature environment will increase the internal pressure of the battery and force the battery pressure limiting valve to open automatically. The direct consequence is to increase the water loss of the battery. Excessive water loss of the battery will inevitably lead to a decrease in battery activity and accelerate the softening of the polar plate. Fatal injuries such as body heating, shell bulging, and deformation. Cherish your scooter and motorcycle from maintenance the battery.