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Hi Emile,
This was a design problem that I ran into years ago, and I
researched it but ended up changing the design to avoid it. The issue is that
"sealed" batteries are not filled with gel or liquid to the top, there is some
free airspace inside them. I have seen no-void batteries on AUVs, but those
batteries were custom built and cost a fortune. To my knowledge if you use
batteries purchased in a regular store, you cannot pressure compensate the
battery compartment without squeezing the
battery.
At the time, I got in touch with manufacturers of AGM
batteries and spoke to one of their engineers. My question was whether I could
drill a very small hole in the top of the case, so as to allow the inside to
compensate. He said definitely not, because the electrolite inside
would dry out over time.
My conclusion was that if you wanted to use air
compensation, you'd have to use conventional liquid-filled batteries and
hydrocaps.
thanks,
Alec From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile Sent: Friday, October 06, 2006 12:22 PM To: psubs Subject: [PSUBS-MAILIST] gel battery question Hi, At the moment the pressure
compensation system op the sgt. Pepper’s is both connected to the thrusters and
the lead acid batterys. This is not ideal.: we had more than
once battery acid or Hydrogen in the thrusters The plan is to use complete sealed
gel battery’s But what to do with the air bubble inside??
Is it possible to fill it complete
with the same goo or some inert liquid and close the battery with a
bladder? Somebody
tried?? Regards, Emile van
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