A123 20AHr Pouch Cell Battery Build & Info Thread

Oatanet used to run a 170v 60ah factory pack in a dune buggy. I'm guessing or as I remember that's how old men say it. So maybe read about his dune buggy build. He is thinking man.
 
The battery search is over.
High discharge amps, UL certified Kokam 57 ah pouch cells,the add is over on the diyelectric car site,
i would like to build like jonescg he is #1 from what i see
 
drutledge said:
Ok so here's my first attempt at an A123 pouch setup. These cells are from the Midwest group buy of the VicPower cells. It's pretty much what a lot of people were talking about: stainless steel rods with plastic standoffs covering them for insulation threaded through holes drilled into the tabs. I tapped threads into the tops of the 1/4" aluminum for the balance leads. It's a 15S1P setup. If anybody has some specific questions I'd be glad to provide more insight into what I gleaned from this attempt. I can give you my McMaster-Carr shopping list if you want.

A few questions of my own though:
- some people are talking about putting paper in between each cell. Is this to prevent chaffing in case of movement or as an insulator believing that the pouches can leak some voltage.
- compression. When placed in larger vehicles these are put under compression. In my limited charging/discharging I haven't noticed any softening or swelling in the cells. I'm charging at less than 1C and discharging at maybe 2C. Is the compression needed for higher C rates only and bike guys like me can get by with just a good tape job?
- this is my first time playing with lifepo. When I charge with my 600w charger, three of the cells really take off from the rest. They quickly get upwards of 100 mv ahead. When taken of charge they slowly come back to within 10mv but I'm afraid what would happen if I kept them on the charger and walked away for too long. Is this normal? Bad cells? I thought I read somewhere here that lifepo had some more range when being broken in. I was also thinking that perhaps my late at night job of cleaning the goop residue from those darn tab stickers might not have been so great. Maybe this is causing some problems?

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I was going copy your connection idea with long bolts and spacers, how did the connections hold up over time? nice work


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I was going copy your connection idea with long bolts and spacers, how did the connections hold up over time? nice work
 
I had some concerns as my A123 20ah pouch cells as one tab was aluminum and the other tab was copper with a nickel plating ? And after 10 years there's no electrolysis the plastic spacer needs to be the width of the volume of the cell with wise as is the aluminum bus Plus if you notice you can drill and tap it for a sense wire even though you have a BMS I support balance wires phone RC type deal 5S 6s 7s so if need be you can put a cheap monitor on there and most of those have a balancing mechanism that takes days. But even though you put a BMS or a Bluetooth BMS or just balance wires coming out you can monitor if just balance wires out you can put an RC alarm on there at as or below and you get to set it.
 
Find the Big moose thread about A123 20ah pouch cells and on second page your should find the build as there are 300plud pages of info please let me know if you found this discussion page as Big moose is not doing very well in these years but he contributed a lot with that information page about building packs with pouch cells and there's a lot of ideas in brain work.
 
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