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

Same discharge with huge heat sink on one side of cell

Same discharge with huge heat sink on one side of cell
even a monster heat sink cant get the heat out from one side

We saw 100F at the end of the first 62A discharge on the cells with no heatsink. I did the same 62A discharge, but this time instead of insulation, I used a huge finned aluminum heat sink,with a lot of air running over it. the idea is to see how well the heat generated in the discharge was transferred out of the cell with one side kept at 74F.
I was a bit disappointed to see the temp on the back side was only held to 90 degrees instead of the 100. This would lead me to believe that the heat sinks would work much better if they were on both sides of each cell rather than every other one?
The ambient temperature probe was getting heated by the discharge load. will move it to a better spot in the next test