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Deep cycle gel solar batteries
What is GEL battery ?
VRLA GEL battery is valve-regulated lead-acid battery (VRLA ) + Gel electrolyte cell technology battery. This is one kind of lead-acid battery for energy storage.
Gel battery is using gel as electrolyte instead of liquid acid. Gel is usually produced by homogeneous dispersion of pyrogenic silica in diluted sulfuric acid. Pyrogenic silica is a kind of powder of very well dispersed SiO, which absorb more than 10 times of its weight acid liquid to produce gel. Because of the thixotropic property of gel, the agglomerates are connecting themselves together as a network which keeps the liquid inside and become gel structure after a certain gelling time. The Gel battery has no liquid inside, the electrolytes is in gel form and stand solid between positive and negative plate inside battery.
The technical features of Gel battery technology :
Using gel as electrolyte
Plate thickness tolerance is not critical since the high compression of plates group assembly is not necessary
More electrolytes for better contact with plates and active materials and container walls, it is good for releasing internal heat and cooling battery temperature.
Using the extra microporous separator which can: a/ reduce the depolarization of the negative electrode and avoid negative plate sulphation b/ without any liquid, significantly decreases thermal runaway c/ Help to prevent short circuits by dendrite growth between the positive and negative plates during deep discharge
Better vent valve design to lower gas leaking rate to extend battery lifetime.
Compared to flooded battery, the advantages of Gel battery are :
Maintenance free, no need to add water
Safe operation since no liquid inside
Can be installed sideways ( upside-down is not recommended )
Long cycle life
Low self-discharge makes shelf life longer.
Long standby life due to its ability to keep electrolyte inside and steady
Performance stays high and stable until the end of life
Tolerance to abuse and heat during operation, good for extreme weather