phildw56au
Member
A couple of months ago, I replaced 3 weak modules in my 2012 24kWh battery - specifically, cells 65, 73 and 81 (as identified by Leaf Spy) would drop 200mV+ below the rest of the pack, triggering turtle mode even though the battery would still have ~40% SOC.
I couldn't source new modules, but managed to get some reasonably healthy second-hand ones.
The car's battery behavior has significantly improved, however, two months later, when I look at the battery state using Leaf Spy, I find that the same three cells - 65, 73 and 81 - still report as weak, compared with the rest of the pack.
Unlike the earlier situation, the voltage differential is now closer to 70mV, but it still impacts on the reported energy remaining as the SOC gets low.
So, my question is ... is it likely that the persistent low voltage reporting of those three cells (and just those three cells - not the even-numbered cells in any of the modules) is being caused by a faulty BMS? If so, is it possible to 'reset' the BMS to address this issue?
Any thoughts from the wisdom of the forum would be appreciated.
Cheers, Phil
I couldn't source new modules, but managed to get some reasonably healthy second-hand ones.
The car's battery behavior has significantly improved, however, two months later, when I look at the battery state using Leaf Spy, I find that the same three cells - 65, 73 and 81 - still report as weak, compared with the rest of the pack.
Unlike the earlier situation, the voltage differential is now closer to 70mV, but it still impacts on the reported energy remaining as the SOC gets low.
So, my question is ... is it likely that the persistent low voltage reporting of those three cells (and just those three cells - not the even-numbered cells in any of the modules) is being caused by a faulty BMS? If so, is it possible to 'reset' the BMS to address this issue?
Any thoughts from the wisdom of the forum would be appreciated.
Cheers, Phil