Lead-acid batteries, the phenomenon of the aging sulfide what harm?

The phenomenon of lead-acid battery plate vulcanizing lead-acid battery plate generated on the coarse grain white lead sulfide phenomenon, known as the lead sulfate hardening or crystallization, referred to as the sulfide or polarization, also called the sulfuric acid salinization. The coarse grain, lead sulfide is different from the discharge in the formation of fine grained galena. Fine grained galena is small in size, and the electrolyte contact area is large. Conductive performance is good, easy to dissolve. When charging easy conversion of reduction; And coarse grain bulky, lead sulfide particles and the electrolyte contact area is small, conductive performance is poor, normal charging is difficult to translate into lead dioxide, and sponge pure lead. Because of lead sulfide is coarse grain size is big, still can jam the pore of active materials, prevent the penetration of the electrolyte, the battery internal resistance increases significantly.

The cause of the lead-acid battery plate vulcanizing from reaction process, the battery discharge, without charge or not charge in a timely manner, the discharge of lead sulfate crystallization, into irreversible lead sulfate crystals in the plate. There are various understanding of sulfide phenomenon, generally think that there are three kinds of vulcanization: one is the interface between electrode and solution, caused by various types of electrochemical itself irreversibility sulfide, known as electrochemical sulfide; Second is to discharge the reagent consumption, electrode surface not promptly added.

On the electrode surface or charging a product accumulation, can't timely evacuation, known as the concentration of sulfide; Three is the electrolyte, the contact resistance between the electrodes and the conductive material caused by sulfide, is called ohm sulfide. The above three kinds of vulcanization is electrochemical reflect resistance. The main reason is often excessive battery discharge or small flow depth of discharge, the lead sulfate deep into the lower plate, a restoration again when charging, gradually lead to sulfide; In addition, the battery in the case of electrical or insufficient charge after long-term placement, lead sulfate is not conversion, will be on the plate hardening; On the electric power department and the motor vehicle battery don't offline, don't get off for a long time, long time floating, electrode was denied the chance of discharge, also in electrode formed on the surface adsorption barrier layer vulcanization.