On lead-acid battery
At present, most of the commercialized electric bicycles are sealed lead-acid batteries, which do not need regular replenish water and maintenance free. The main chemical reactions are: PbO2+2H2SO4+Pb, charge, discharge, PhSO4+2H2O+PhSO4
Lead acid battery is rechargeable to lead sulphate, the sponge like lead of the anode and anode of lead acid is released into the electrolyte, which is spongy lead and lead oxide respectively, and the concentration of sulphuric acid in the electrolyte becomes larger and larger; on the contrary, the lead oxide in the anode and the spongy lead on the cathode plate and the sulfuric acid in the electrolyte when discharge is discharged. The reaction turned to lead sulphate, while the concentration of sulfuric acid in the electrolyte decreased. When the lead-acid battery is insufficient, the lead sulfate in the two polar plate of the Yin and yang can not be completely converted into spongy lead and lead oxide. If the long-term charge is insufficient, lead sulfate will result in the crystallization of lead sulfate, and the plate is vulcanized and the quality of the battery becomes worse; if the battery is overcharged, the amount of oxygen produced by the anode is greater than the adsorption capacity of the cathode, The internal pressure of the battery increases, resulting in gas spillover and electrolyte decrease, which may lead to softening or falling off of active materials, and the battery life is greatly shortened.