New England Hybrid Festival 2013
Mikes You Tube Videos
Mikes Saturday Hybrid-Solar- Electric Workshop
Insight 20 AH lithium battery system
assembling the pack core
BMS board mounting position?
Capturing the mounting boss positions
Cell tester is modified and lithium test fixture takes shape.
Charging experiments
Cleaning the cell tabs
fixing and deburring the heat spreaders
Final assembled pack core
Finishing the connection blocks
finishing the fins and end plates
First discharge graph
Getting started on the final design and build
Heat sink fins
heatsink vs no heatsink comparison
Higher thermal sensitivity look at the cell heating still shows no dents
Hot and cold cells compared.
How do the big guys do it
Is using this asking for a problem?
main I/O terminals and Heat shrink
Making the 50 insulating strips
Painted cells to increase emissivity
Punching the holes in the tabs
Same discharge with huge heat sink on one side of cell
Testing the fans and layout of the BMS boards
The Battery case starts to take shape
The case is nearly finished
the connector plate is made and mounted
The tab punch
The world in IR Cool
Grid charger Users page
Mikes Surplus Loft
Renewable energy exhibits
New England Hybrid festival 2014

Painted cells to increase emissivity

Painted cells to increase emissivity
> 100A discharge yields 21AH

Put 3 coats of flat black paint on the cells to make the cell surface more of an emitter, so I can get some good thermal uniformity photos.
The discharge was at the highest so far at 103A, and as the photos show. we had some red glowing load bands. Even the #10 lead wires got up to over 100F.
The cells did even better at the 103A than they did at 68A, so I suspect that warm is better than cool for getting the most energy out out of the cells.
Next test will be to freeze the fixture and see what the differences may be.
Pretty impressive cells for sure.