It is normal for Liu Mengjie to charge the battery for 7~ 10 hour.
The charging time of electric vehicle battery with lead-acid battery is generally designed to be 8 hours, and the charging current is limited due to design reasons. Generally, it is normal to charge for more than 7 hours, and it is normal to charge for less than 10 hours. If the battery is fully charged soon, the battery performance will no longer be good.
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Lead-acid batteries are widely used and studied by all kinds of electric vehicles in various countries because of their low price, rich material sources, high specific power, mature technology and manufacturing process and high resource recovery rate. As a labor-saving, convenient, fast, comfortable, cheap and zero-emission personal means of transportation, electric bicycle has been widely accepted by people and paid attention to by relevant state departments.
The light electric vehicle industry development strategy research group, which is attended by the State Council Development Research Center, National Development and Reform Commission, Ministry of Construction and Ministry of Science and Technology, has put forward the "Light Electric Vehicle Industry Development Strategy Report". The number of electric bicycles in China has reached more than 30 million. More than 95% of electric bicycles use VRLA batteries.
The vast majority of commercial electric bicycles are sealed lead-acid batteries, which do not need to be replenished frequently and are maintenance-free. The main chemical reactions are: PbO2+2H2SO4+Pb← charge and discharge → 2PbSO4+2H2O.
Sponge lead, which becomes the cathode and anode of lead sulfate when the lead-acid battery is charged, releases the sulfuric acid component fixed in it into the electrolyte, which becomes sponge lead and lead oxide respectively, and the sulfuric acid concentration in the electrolyte keeps increasing; On the contrary, lead oxide in the anode and sponge lead on the cathode plate react with sulfuric acid in the electrolyte to generate lead sulfate, and the concentration of sulfuric acid in the electrolyte decreases continuously.
When the lead-acid battery is under-charged, the lead sulfate of the positive and negative plates cannot be completely converted into sponge lead and lead oxide. If it is not charged for a long time, it will lead to crystallization of lead sulfate, sulfidation of the electrode plate and poor battery quality.
On the other hand, if the battery is overcharged, the amount of oxygen produced by the anode is greater than the adsorption capacity of the cathode, which will increase the internal pressure of the battery, lead to gas overflow, reduce electrolyte, and may also lead to softening or shedding of active substances, thus greatly shortening the battery life.