SLPinfo.org wrote:
[Cor] implied that with subsequent charging a
series pack can actually move closer together (i.e., become more
balanced). Is that really true?
Yes. Deliberate overcharging is the traditional way to balance lead-acid
batteries. It works, though not very well.
When you overcharge, the batteries that reach "full" first begin to heat
up and gas. If this is a flooded battery, the water loss isn't critical,
as you can replace it. If it's a sealed battery, the case pressurizes
inside. Too much overcharging, and the vents will open to relieve the
pressure, and water will be lost forever -- this shortens that battery's
life.
The extra heat also tends to shorten the life of the battery being
overcharged. If the overcharging is modest, the loss in life is also modest.
So, balancing by overcharging is cheap and easy. As long as the
imbalance you're trying to correct is small, the loss in life isn't too
bad (most people won't notice it).
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee Hart -- see my EVs and projects at http://www.sunrise-ev.com/
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