It turns out there was some sort of website form problem and I was able to talk to Matt at
the Electric Car Parts Company today -- working on the order now.
So here's a troubling issue with my setup:
I'm planning to set up the batteries in my Solectria E-10 pickup as a single string of
buddy pairs of CALB CA100 lithium-ions. I'm working with a nominal 144V setup in this
truck and figure the buddy pairs are the best way to limit the current each battery module
sees. I have 56 of them from my Solectria Force now, and my plan is to use them and pick
up additional batteries to bring the total to 96 modules (48 buddy pairs), and set the
whole thing up with an Orion BMS to wrangle the batteries and keep them in good shape.
I wanted to be sure that I had 56 good batteries from the Force so I opened up the battery
boxes today. All the modules look great. I started taking voltage readings and all the
batteries were between 3.31 and 3.34 volts -- except for two of them.
Those two were ZERO VOLTS, and show ZERO OHMS resistance.
Is this a common failure mode of lithium-ions (or the CALB modules)? I'm thinking that
I'd better set up some kind of fusing between the buddy pairs because if one of the pair
fails in this way, it's going to present a dead short to its buddy -- and nothing good is
going to come of that.
Comments? Suggestions? I'm wondering what size & type fuse I should use on the buddy
pairs to deal with this scenario and if such a fuse would be enough. I think the maximum
current draw on the truck will be around 480A (two Brusa AMC320 motor controllers @ max
240A each).
-Tom
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