Factors of affecting deep-cyclic life of valve-regulated lead-acid battery

The factors (such as grid alloy, AGM separator, the design of the thickness of battery plate, the assembling pressure, the charging regime and the discharging current) of affecting deep cycle life of valve regulated lead acid VRLA battery were discussed. The experimental results of deep cycle life at same discharging regime and different charging regime were also illustrated. The results show that: 1. Adding 1%-1.5% (mass percentage) tin into lead calcium alloy can restore the creep resistance of the grid and prevent the grid growth as well as increase its cycle life; 2. VRLA battery can get the most optimum specific energy and cycle life by adopting the plate with the most optimum thickness; 3. High quality AGM separator and high assembling pressure are the important factors of preventing battery life from early end; 4. Charging regime is the key factor of dominating whether the battery have long serve life or not; 5. The effect of discharging current on battery life is also important because the PbSO 4 produced at low discharging current is more difficult to be oxidized than that produced at high discharging current.