How does internal resistance affect battery capacity?
A battery with low internal resistance delivers high current on demand. High resistance causes the battery to heat up and the voltage to drop. The equipment cuts off, leaving energy behind. Lead acid has a very low internal resistance and the battery responds well to high current bursts that last for a few seconds.
Does internal resistance of a battery increase?
As the battery is discharged the electrolyte concentration is reduced, becoming pure water when the battery is fully discharged. Because of this change in electrolyte concentration the battery resistance increases during discharge.
What happens when the internal resistance of a battery increases?
If at least one of the battery cell’s IR will increase, the whole pack performance will degrade . The higher the internal resistance the less current the battery is capable to provide. The higher the internal resistance the more the battery will heat up on the same current output.
Can a cell capacity be affected by internal resistance?
However, not all factors affect a cell capacity to the same degree as they affect the internal resistance, or vice-versa. There is a general correlation among the most frequent factors that increase the internal resistance and, at the same time, tend to decrease the capacity.
Is the internal resistance test the same as the capacity test?
The table from the document indicates that the internal resistance test may be used instead of the capacity test. However, the internal resistance tests cannot tell us everything regarding battery capability or condition. Low capacity cells can be identified, but absolute predictions regarding the cell capacity are more difficult to make.
What is the internal resistance of a LiPo battery?
In rechargeable lithium polymer (LiPo) batteries, the internal resistance is largely independent of the state of charge but increases as the battery ages; thus, it is a good indicator of expected life.