EV battery

The working principle of lead-acid batteries

by：Vglory 2020-09-22

1. Lead-acid battery discharge: - H2SO4 left, H2O, write a electrolyte proportion p left; Charging: write a p. By p measurements to found new battery her discharge levels. 2. In fact for lead-acid battery discharge: PbO2 + 2 - h2so4, Pb4 + + 2 SO42 - + 2 h20 is plate actives, The positive plate) ( Liquid) Are potential P + 2 v, Pb and electrolysis, Pb + + 2 e ( Negative plate) - negative potential - 0. 1 v ( The cathode) Dissolve in the electrolyte and circuit open: E = 2. 1 v ( The single voltage) 2 - ( - - - - - - 0. 1) = 2. 1 v external connected: negative 2 e - positive plate, combined with Pb4 +, Pb2 +. PbO2 and Pb in lead-acid battery plate, all become PbSO4, the discharge end, in fact the electrolyte can't penetrate the plate active substances the innermost, even battery without electricity supply, plate on the part of active substances can only become lead sulfate. Plate to be as thin as possible, the area is large. 3. Increase the discharge current: the single cell, multiple sets of positive and negative plates in parallel to improve plate Kong Chen degree, reduce the thickness of the plate. 4. Charge and discharge process the opposite: 5. Lead-acid battery charging characteristics determine the battery enough three principles: 1. Charging voltage U reach the Max, and 2 h no longer increases; 2. The electrolyte density, sc to Max, and 2 h no longer increases; 3. Battery heated gives off a lot of bubbles, electrolyte boiling; 6. 1 lead-acid battery discharge characteristics. The single battery voltage to discharging termination voltage ( Such as table) ; 2. P left the minimum value of 1. 1g/cm3。

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