As long as it is a lead-acid battery, it will be vulcanized during use, but lead-acid batteries in other fields have a longer life than those used in electric bicycles. This is because the lead-acid batteries of electric bicycles have a more easily vulcanized work environment.
1. Deep discharge
The lead-acid battery used in the car is only unidirectionally discharged during ignition. After ignition, the generator will automatically charge the battery without causing deep discharge of the battery. Electric bicycles cannot be charged when riding, and often exceed 60% of the deep discharge. During deep discharge, the concentration of lead sulfate increases, and the vulcanization will be quite serious.
2. High current discharge
The cruising current of an electric vehicle for 20 kilometers is generally 4A, which is already higher than the working current of batteries in other fields, and the working current of an electric vehicle that is overspeed and overloaded is even greater. Battery manufacturers have conducted cycle life tests of 70% charge at 1C and 60% discharge at 2C. After such a life test, there are many batteries that can reach a lifespan of 350 charge-discharge cycles, but the actual effect is far from the same. This is because high current operation increases the depth of discharge by 50%, and the battery will accelerate vulcanization. Therefore, the battery life of the electric three-wheeled motorcycle is shorter, because the body of the three-wheeled motorcycle is too heavy, and the working current is more than 6A.
3. High frequency of charge and discharge
Batteries used in the field of backup power supply will only be discharged when there is a power failure. If the battery is stopped 8 times a year, to achieve a life of 10 years, it only needs to achieve 80 cycles of charging life, while electric vehicles charge and discharge cycles 300 times a year. Times and above are common.
4. Short charge
Since the electric bicycle is a means of transportation, there is not much time for charging. To complete the 20A charging of 36V or 48V within 8 hours, it is necessary to increase the charging voltage (usually 2.7~2.9V for a single section). When charging When the voltage exceeds the oxygen evolution voltage (2.35 volts) or the hydrogen evolution voltage (2.42 volts) of a single cell, the battery will open the valve and exhaust due to excessive oxygen evolution, causing water loss, increasing the electrolyte concentration, and increasing the vulcanization of the battery. .
5. Can not be charged in time after discharge
As a means of transportation, the charging and discharging of electric bicycles are completely separated. It is difficult to charge in time after discharge. If a large amount of lead sulfate is formed after discharge, if it is not charged and reduced to lead oxide for more than half an hour, it will sulfide and form crystals. .
