DaveinOlyWA wrote:first one; batt temps started in mid 50's, ended in low 90's. SOC 4 - 57%. ramp down 54%.
2nd one; batt temps 85-90º, ended 115º SOC 27- 78% ramp down 64%
3rd one (not expecting much) batt temps started 113, ended at 115 (batt temps on charge graph was nearly flat from halfway thru 2nd charge)
started at 22 KW (65 amps) charged 23 mins, SOC 75-91% (59 amps)
That doesn't look horrible to me. It seems that Nissan has decided they don't want the battery temperature to go above 115F.
At a charging rate of 22 kW, the battery "hot spot" temperature is certainly above 115F, perhaps as high as 150F. I don't know about NMC622, but some Li-ion batteries have temperatures above which VERY bad things happen. In this case, it's more likely Nissan just wants to limit the highest temperatures that the hottest cells in the pack will see during charging in order to limit their degradation rate relative to the coolest cells. Remember, the pack's capacity is roughly the capacity of the worst cell-pair times the number of cell-pairs.
agreed. Here you see still charging at 35 KW when temps first hit 115º. So stop charge, go 15 miles down road, start charge at nearly same temp and it drops to 22 KW (see gap on green line) so its looking like starting temp is key.
2nd charge batt temps 84.3/89.2/90.4
Thanks for your rapid charging graph! This is exactly the same problem as we saw on your LEAF 2.0 in Europe.
Here are the numbers from Bjørn's 600 mile yesterday in Norway:
T1: 32,0º T2: 29,7º T3: 22,5º SOC: 16,1% Charge: 42.6 kW
T1: 40,4º T2: 38,9º T3: 30,6º SOC: 42,4% Charge: 44.4 kW
T1: 44,0º T2: 42,6º T3: 34,1º SOC: 54,3% Charge: 45.0 kW
T1: 47,9º T2: 46,6º T3: 37,9º SOC: 68,5% Charge: 36.2 kW
T1: 48,3º T2: 47,0º T3: 38,4º SOC: 70,8% Charge: 34.3 kW
T1: 45,4º T2: 41,8º T3: 32,6º SOC: 48,7% Charge: 22.1 kW
T1: 46,6º T2: 42,7º T3: 33,3º SOC: 56,1% Charge: 21.1 kW
T1: 41,0º T2: 34,4º T3: 23,5º SOC: 34,9% Charge: 25.9 kW
T1: 44,4º T2: 37,7º T3: 26,6º SOC: 54,7% Charge: 26.1 kW
T1: 46,0º T2: 39,2º T3: 28,5º SOC: 64,4% Charge: 26.0 kW
T1: 37,1º T2: 29,6º T3: 18,4º SOC: 15,1% Charge: 30.9 kW
T1: 42,9º T2: 36,2º T3: 25,7º SOC: 52,2% Charge: 29.7 kW
T1: 44,4º T2: 37,8º T3: 27,6º SOC: 60,9% Charge: 29.2 kW
T1: 39,6º T2: 32,7º T3: 22,2º SOC: 21,8% Charge: 26.1 kW
T1: 42,3º T2: 35,3º T3: 24,8º SOC: 48,0% Charge: 26.4 kW
T1: 44,3º T2: 37,3º T3: 26,7º SOC: 59,2% Charge: 27.0 kW