Cliff notes version of the problem:
Two of the modules in my 2P5S Leaf battery conversion for an Electrak
E20 tractor seem to have failed in an identical manner. The two
modules are a paralleled pair, with the voltage sense terminals
bussed together. What appears to have happened is that one cell in
each 4-cell (2P2S) module has been removed from the circuit, possibly
due to a brief short circuit. The nominal measured 100 Ampere-hour
capacity of this pair of cells has dropped to almost precisely 50 Ampere-hours.
I have a feeling that the brief short circuit may have opened an
overcurrent device in one of the pouch cells in the paired half of
each of the two modules.
Before I go on a long search trying to find healthy modules (SoH
~75-80%) to replace these, it might be worth a go to try and
repair/replace/reset the overcurrent fuse/breaker/fusible link that
is causing the problem.
The new problem is: trying to get the sheet metal off the exterior of
the module in a non destructive manner. Anyone here have tips or
tricks? So far, I've managed to gently pry the coverings almost
loose, but not enough to even peek inside. Are there hidden fasteners
or some such, or are these modules glued into a solid, non-openable brick?
Cor? Phil? Jay? Anyone?
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