|
Posted by Wayne on October 31, 2007, 10:13 pm
Please log in for more thread options
>
>> Bob Wilson is the battery still available?
>
> I'm not selling either of my batteries. However, they come up on Ebay
> from time to time.
>
>> Where are you located?
>
> Huntsville Alabama.
>
>> How do you refurbish one of those batteries?
>
> The battery pack consists of 38, cell packs with six, 6.5 Ah cells in
> series. NiMH cells at full charge are at 1.2. Each cell pack is at 7.2
> VDC at full charge for 273.6 VDC.
>
> The process I'll use is as follows:
>
> 1) use a 300-400 W load to discharge the battery to an average voltage
> of 0.9-1 VDC, ~228 VDC and cutoff at that level
> 2) measure open cell pack voltage for each pack
> 3) using a constant current, ~1A., to recharget the battery pack to 275
> VDC
> 3a) monitor the cell pack temperatures and look for hot packs
> 4) remove the charger and let cells sit for an hour and normalize their
> temperature
> 5) put a 300-400 W load on the battery assembly and measure the
> individual cell pack voltages during the discharge to ~228 VDC
>
> Based upon these measurements, I should have a mapping of the strongest
> and weakest cell packs. I have four spare battery packs and will weigh
> the weakest and spare packs and put the heaviest ones back in the pack.
> I'll also shift the strongest cell packs into the location of the
> weakest cells. Then I'll repeat the whole pack test.
>
> When done, the strongest cells will be where the weakest cells were
> removed. The weakest cell packs will be removed for electrolyte
> refreshing.
What does that mean? You can't actually dismantle a cell and change the
chemical pastes inside, can you?
Then I'll recharge the pack and install the two, high power
> sockets and safety relays.
>
> When I'm done, my 2003 Prius will have a battery pack with a plug-in
> tickle charger. This means every morning I'll start the car with a fully
> charged battery, actually I'm shooting for 78-79% state of charge as
> well as a warmed engine and transaxle.
>
> The current pack will then go through a survey to identify the strongest
> and weakest cells. Again, the weakest cell pack assemblies will be
> removed and the strongest cell packs shifted to put the strongest ones
> where the weakest ones were located. Then I have this spare inverter I'm
> planning to use with the battery pack for home power.
How many "batteries" are in the car?
Do you buy replacement cells, or packs?
Where do you buy them?
How much to they cost?
Wayne
>
> Bob Wilson
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap