The development momentum of electric tricycle
s is extremely rapid. In recent years, the actual output each year has exceeded the social holdings. This is an amazing data. The lead-acid batteries used in cars are discharged in a single direction during ignition. After ignition, the generator will automatically charge the battery without causing battery depth. Discharge. It is impossible to charge an electric tricycle when riding, and it often exceeds 60% of the deep discharge. During deep discharge, the concentration of lead sulfate increases, and the vulcanization will be quite serious. The cruising current of high-current discharge electric vehicles for 20 kilometers is generally 4A, which is already higher than the operating current of batteries in other fields, while the operating current of electric vehicles that are overspeed and overloaded is even greater. Battery manufacturers have conducted cycle life tests of 70% at 1C and 60% at 2C. After such a life test, there are many batteries with a life span of 350 charge-discharge cycles, but the actual effect is far different. This is because the high-current operation increases the depth of discharge by 50%, and the battery will accelerate the vulcanization. Therefore, the battery life of an 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. High charging and discharging frequency. Batteries used in the field of backup power supply will only be discharged when there is a power failure. If the power is stopped 8 times a year, it will reach a life of 10 years. Only 80 cycles of charging life are required, while electric vehicles are one year More than 300 charge-discharge cycles are common. Short-term charging Since electric tricycles are vehicles, there is not much time for charging. To complete 36V or 48V 20A-hour charging within 8 hours, the charging voltage must be increased (usually 2.7~2.9V for a single cell) When the charging voltage exceeds the oxygen evolution voltage (2.35 volts) or hydrogen evolution voltage (2.42 volts) of a single cell battery, the battery will open the valve to exhaust due to excessive oxygen evolution, causing loss of water and increasing the electrolyte concentration. The vulcanization phenomenon has increased. It cannot be charged in time after discharging. As a means of transportation, the charging and discharging of electric tricycles are completely separated. It is difficult to charge timely after discharging. If the large amount of lead sulfate formed after discharge is not charged for more than half an hour, it will be reduced to lead oxide. Will vulcanize and form crystals.
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