My test could have been much better controlled, so yours may be more accurate.
I have a lab hotplate with magnetic stirrer, so I placed a ceramic dish that was about 3" tall X 5" diameter on the hotplate. I bent a full length PTC strip between each ptc sensor so the strip made a loop about 4" diameter I put a right angle bend on the ends so the bare metal was above the water surface. Connections with mini hook test leads.
The stirrer kept the water pretty uniform until I got to 120 or so, and then the temp shot up quickly as the heat finally soaked through the ceramic.
A better test would be to datalog the temp and resistance as the container warms at a more uniform and controlled way.
I was mainly trying to decide if I can use the PTC resistance to do double duty for temperature measurement, and hot cell detection.
Probably not.
The other 4 temperatures sensors may be a better place to start?
I will look at tapping one or more of those or possibily just add a MIMA type temperature probe that would measure the pack exhaust air to the design.
It would be great if the BCM could be powered up so peters BCM monitor could give the charger the pack information, but that has not been accomplished without codes if I remember correctly.
Last edited by Mike Dabrowski 2000; 09-03-2010 at 03:16 PM.
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