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

heatsink vs no heatsink comparison

heatsink vs no heatsink comparison
A-B comparison of cell with heatsink and cell without

I set up an interesting thermal comparison. I made two 0.061" thick aluminum plates that are the same size as the cells, and two that were 2" longer and wider.
I placed the same size plates top and bottom of one cell. and the larger plates so the extra 2"of plate was off the bottom and one side of the other cell. the top and bottom plates form a heat sink area where I can blow air.
As expected, the cell with extra fins was only half as hot as the one with only the plates, it stayed under 85F. What I did not expect was that the cool cell dropped off noticeably quicker than the warm one. will reverse the heatsinks and do another run, to see if things change cells as final confirmation.
**** Results of moving the heat sink to the other cell was as expected, the cool side being changed also changed the cell that dropped out first almost exactly the mirror image of this trace. Temperature matters. Where is the sweet spot between longevity, temperature, capacity