Electric tricycles are developing rapidly
The development of electric tricycles is extremely rapid. In recent years, the actual output every year has exceeded the social holdings. This is an astonishing figure. The lead-acid battery used in the car with deep discharge is only unidirectionally discharged during ignition. After ignition, the generator will automatically charge the battery without causing battery depth. discharge. Electric tricycles cannot be charged during 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.
The cruising current of a large-current discharge electric tricycle 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 over-speed and overloaded electric tricycle 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 electric tricycle, 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.
High frequency of charge and discharge The battery used in the backup power supply field will only be discharged when the power is cut off. If the power is cut off 8 times a year, to achieve a life of 10 years, it only needs to achieve 80 electric tricycle of charging life. It is common for tricycles to charge and discharge more than 300 times a year.
Short-term charging Since electric tricycles are means of transportation, there is not much time for charging. To complete 36-volt or 48-volt 20A hour charging within 8 hours, it is necessary to increase the charging voltage (usually a single section of 2.7~ 2.9 volts), when the charging 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 and increasing the electrolyte concentration. , the vulcanization of the battery is aggravated. It cannot be charged in time after discharge as a means of transportation. The charging and discharging of electric tricycles are completely separated. It is difficult to charge in time after discharge. If a 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 sulfide into crystals.
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