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How is the capacity of a battery affected by pulses?
1. The capacity of the battery for a low duty cycle of high current pulses will be according to the average discharge rate, rather than the high discharge rate. 2. If the pulse rate and duty cycle are not such that the battery can recover between pulses the battery life will be reduced compared with its average rate discharge curve.
What’s the maximum current a battery can discharge?
•Maximum 30-sec Discharge Pulse Current –The maximum current at which the battery can be discharged for pulses of up to 30 seconds. This limit is usually defined by the battery manufacturer in order to prevent excessive discharge rates that would damage the battery or reduce its capacity.
When is the maximum power obtained in a pulse?
In cases where the majority of the discharge is at low rates, with a few high current pulses spaced widely, the capacity of the battery will be dominated by the low rate. The maximum power is obtained in a pulse when the load resistance is equal to the internal battery resistance.
How can a battery be increased in capacity?
Letting the battery rest between pulses, or reducing the current drawn significantly between pulses, can allow the battery chemistry to relax and increase the capacity of the battery over that of a continuous high current discharge. So polarization losses can be recoverable.
What happens to the capacity of a battery when it discharges?
Most battery discharge curves show constant-current or constant-power discharge. Batteries that have a significant Peukart effect exhibit lower capacity at higher discharge currents. Most primary cells, and lead acid secondary cells show significant Peukart effect.
How long does it take a lead acid battery to discharge?
In like manner a lead acid battery will typically discharge in half an hour when it is discharged at the nominal one hour rate, or the 1C rate, where the capacity C is measured over a 20 hours discharge. Following is a curve of the equivalent capacity of a 55AH sealed lead acid battery when discharged at rates from 222A to 2.75A.