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Working Environment Factors That Affect The Battery Life Of Electric Vehicles

- May 18 2021 -

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 the lead-acid batteries used in electric bicycles. This is because the lead-acid batteries of electric bicycles have a more easily vulcanized Working environment.
1. Deep discharge
The lead-acid battery used in the car only discharges unidirectionally during ignition, and the generator will automatically charge the battery after ignition, without causing deep battery discharge. However, it is impossible to charge an electric bicycle 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.
2. High current discharge
The cruising current of an electric vehicle for 20 kilometers is generally 4A, which is higher than the operating current of batteries in other fields, while the operating current of an electric vehicle that is 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.
3. High charging and discharging frequency
The battery used in the field of backup power supply will only be discharged when the power is cut off. If the power is stopped 8 times a year, it will reach a life of 10 years, and only need to achieve a charging life of 80 cycles, while an electric vehicle has a charge and discharge cycle of 300 per year. More than times is very common.
4. Short-time charging
Since electric bicycles are vehicles, there is not much time to charge them. To complete the charging of 36 volts or 48 volts at 20 ampere hours within 8 hours, it is necessary to increase the charging voltage (usually 2.7 to 2.9 volts per cell). When the 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 and exhaust due to excessive oxygen evolution, causing loss of water, 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. After discharging, it is difficult to charge in time. If the large amount of lead sulfate formed after discharge is not charged and reduced to lead oxide for more than half an hour, it will be vulcanized and crystallized .