goldbrick wrote: ↑Fri Sep 15, 2023 7:32 pm
The 'internal resistance' of the battery - often assumed to be measured by the Hx reading in LeafSpy - makes a big difference in how much the battery heats up when charged or discharged. The 40kWh packs do seem to have much more stable Hx readings than the 30kWh packs. So if that is truly a measurement of the equivalent resistance of the battery it makes sense that they would heat up less while charging.
Data compiled over numerous years (2014 - 2020) for Gen 1 Leafs indicate that Hx is the reciprocal of resistance,
i.e. conductance - decreasing as the battery ages. Gen 2 Leafs seem to be following Gen 1 Hx changes as those
batteries age over 5 years, i.e. Hx (battery conductance) is decreasing.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 80% > 1000X, temp < 95F, DOD > 20 Ahrs
#2 Leaf SL MY 12/18: 44K miles, SOH-90, Ahrs-115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F