Re: Why not Lead Cobalt anda Histerical look Back

["VanDerWal, Peter" <vanderwp@fhu.disa.mil>]

> > I don't know if that's the case hear, but most of what I've heard about
> > tri-polar batteries leads me to think they are more hype than substance.
> 
> To me it sounds like the substance is the cooling of the interconnects 
> by the electrolyte and the convection in the electrolyte caused by it's 
> heating by the interconnects.  If I remember correctly, mixing the 
> electrolyte in a cell improved energy extraction at high current draw 
> rates, but goes to zero improvement at low current draw rates.  
> Basically only so much energy can be stored in a battery with a given 
> cell chemistry.  Fluid cooling of the interconnects will help them last 
> longer and carry more current for a given cross sectional area.
> 

Except that the interconnects on a standard battery are so short and of a
sufficiently large cross section that they have extremely low resistance and
don't get hot in the first place.  With triple redundancy there is even less
heating so there is no need for cooling and probably immeasurable convection
heating.

Take a T-105 6V battery for example.  Internal resistance is .004 ohms for
the whole battery.  The majority of this resistance is plate to plate across
the electrolyte.  I don't know for sure but I'd guess the interconnects have
about .0001 ohm or less resistance.  300 amps of current would cause .03
watts of heating per interconnect or .15 watts total.  Not a lot of heat.