Characteristics of Discharging 1. Final Discharging Voltage
The final discharging voltage is the battery terminal voltage in close circuit voltage per cell to which a battery discharging safely and maximize battery life. The higher discharging current is, the lower final discharging voltage of battery should be .
Discharging Current Final Discharging Voltage(VPC) Up to 0.1CA 1.75 0.11-0.17CA 1.70 0.18-0.25CA 1.67 0.26-1CA 1.60 Above 1.1CA 1.30
2 Battery Discharging Characteristics:
The discharging capacity of battery depends on the discharge rate being used and ambient temperature. Figure 2 show the different discharging current corresponding to discharging capacity at 20 oC(68oF) to 25oC(77oF) for LFP type batteries. They show that the rated capacity of a battery is reduced when it is discharged at a value of current that exceeds its 10-hours or 20-hours rate.
Temperature Effects in Relation to Battery Capacity.
At a higher temperature, the capacity of battery increases and conversely at a lower temperature, the capacity of battery decreases. Figure 4 shows the effects of different temperature in relation to battery capacity.
Giving due consideration to the above factors, the actual life of a battery in cycle service is dependent on the depth of discharge of each cycle. The greater the depth of discharge of each cycle, the less the number of cycles available from the battery.
The estimated life under float service of FP type is 7 years at 20oC/68oF; LFP type is 12 years at 20oC/68oF; CFP type is more than 20 years at 20oC/68oF. The float service life is affected by the factors listed above and the number of discharging, the depth of discharging the battery suffers during its life time. The more discharges suffered and the deeper the discharges, the shorter the battery life. The higher the temperature, the shorter the battery life. If the battery temperature remains at an elevated level for an extended period of time, the expected life is reduced by 50% for each 8 to 10oC of constant temperature above 20oC/68oF.
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