battery current ripples

[homoly]

Hello,

I would like to find more information on battery current ripples and estimation of the ripple amplitude in the case of lead acid batteries.

During charging this is most obvious during boost charging ( typically around 0,1C current ). Last time I used VRLA batteries to created square pulse current impulse ( 2 12AH batteries in parallel - i generated pulse with amplitude around 45 Amps ) and during ON time I have observed also a ripples with the amplitude around 2 Amps. Is this phenomenom caused by charging or discharging the lead acid battery with high currents?

Could anybody give me more detailed explanation, name of the phenomenon or some usefull links?

Any help will be appreciated.

Gabriel.

 

[IRstuff]

In general, one disconnects the charger if one doesn't want to see charger artifacts.

TTFN

FAQ731-376

 

[homoly]

Maybe I should express myself more clearly. I am curious about the root cause ( phenomenon ) not the way how it can be avoided. Is it a property of all lead acid batteries, electrochemical process or something else, and so on ....

 

[IRstuff]

The Albers battery site posted in your other thread has a bunch of white papers on impedance testing that mentions noisiness of batteries.

So, it appears that batteries will do so by themselves, which is probably not surprising, given that you're looking at the aggregate effect of millions of little chemical reactions all attempting to occur in parallel.

TTFN

FAQ731-376

 

[homoly]

IRstuff,

Thank you to point this out. I will check again whitepapers focusing on noise.