Mark S
They are basically the same cells.
I have removed them from a Ford escape hybrid battery pack.
The ford uses them in 5 cell modules(6 volts nominal).
The Insight uses them in a 6 cell modules
Quite modular.
I hope to use an arduino to monitor and report voltage and diference between series modules.
maybe have it set an led if the difference meets a certain range.
I will also connect a thermister to monitor temp.
I hope this will provide a reference of battery health and watch for degredation.
So far these cells are pretty fault tollerant.
From: "mstafford@natca.net [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, November 2, 2017 7:46 PM
Subject: [Electric Boats] Re: Battery monitor idea
Mark F.,
Your intent is similar to my 2000 Honda Insight with 370K miles and still its first traction battery pack of NiMH cells. So there is evidence of longevity in your plan.
NiMH cells are sometimes even helped by over- and under-charging, "top" balancing and "bottom" balancing. Most Lithium tech batteries rapidly chemically degrade internally with either high or low voltages. NiMH are different; they tolerate long gentle (less than 300mA for more than 3 days) overcharges, as long as they don't build up heat. This makes packs easy to top balance (a "grid charger" in Insight-speak). Some Insight owners even rejuvenate their traction battery packs with intentional sequential high-low-high-low.... cycles bursting to 30 Amps ("pack wacker").
Old Insights use just 3 temp/voltage probe taps on their 175Voc series packs, or one tap every 10 or 15 cells (I forget nominal voltage and cell count).
Just know your plan is not perfect, but could help identify weaker strings of cells.
Mark S.
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Posted by: Mark F <mark.internet@yahoo.ca>
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