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

First discharge graph

First discharge graph
First recorded discharge, first test ot test fixture

Well the fixture seems to work. I think that we have a test system.

Some uncertainty as to if I was fully charged at the start, but we have a respectable 18AH
The temperature rose immediately and this was at only 68A, so I want some active cooling, based on just this test.
Next I will charge back up, and re-run the test but this time with an infinite heat sink right against the cells instead of the insulation.
The violet cell started at a lower voltage, but soon after the discharge started it was higher, and it remained higher for the rest of the discharge.
Wonder what that means?