Alec, Thanks for your input. The idea was not to air
compensate them but fill the air bubble (each cell?) with the same or
another liquid. Then close the drilled hole with something elastic to
compensate small volume changes by temperature. Regards, Emile Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens Smyth, Alec 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,
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile 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 Essen The contents of this e-mail are intended for the named addressee only. It
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