nlspace wrote: ↑Thu Dec 12, 2019 3:51 pm

HX is the lookup table value of the internal resistance, a percentage of the original value. If HX is greater than 100%, then the IR is increasing (meaning cells are degraded).

Typically on the pre-2018 (40 kWh) Leafs the Hx (%) decreased over time following the SOH, which indicates a ratio of conductances (GX/G0),

where G0 is the initial conductance of a new battery. Using resistance as the value and having the percentage decline over time,

then the ratio for resistance is R0/RX. Sample data from my Leaf have indicated a declining value for Hx over time. At least now there's

agreement that Hx is a ratio and not some actual value.

Here're my resistance values over time as SOH declined:

11/20/14 -13,700 miles, 76 mohms per LeafDD, 20 Deg, 73% SOC

11/27 -13,800 miles, 67 mohms per LeafDD, 25 deg, 63% SOC

11/30 - 13,900 miles, 56 mohms per LeafDD, 27 deg, 71% SOC

12/2 - 14.100 miles, 55 mohms per LeafDD, 28 deg, 67% SOC

12/16 - 14,500 miles, 89 mohms per LeafDD, 15 deg, 93% SOC

12/27/14 - 14,800 miles, 103 mohms per LeafDD, 11 deg, 24% SOC

3/10 - 17,400 miles, 60 mohms per LeafDD, 30 deg, 73% SOC

3/14 - 17, 550 miles, 56 mohms per LeafDD, 32 deg, 47% SOC

4/14 - 19,100 miles, 59 mohms per LeafDD, 25 deg. 38% SOC

5/4 - 19,989 miles, 64 mohms per LeafDD, 24 deg. 48% SOC

5/15 - 20,400 miles, 73 mohms per LeafDD, 20 deg. 41% SOC

5/22 - 20,700 miles, 58 mohms per LeafDD, 28 deg. 50% SOC

12/10/15 - 28,000 miles, 90 mohms per LeafDD, 19 deg. 92% SOC

4/5 - 32,000 miles, 74 mohms per LeafDD, 24 deg, 55% SOC

5/16 - 33,700 miles,89 mohms per LeafDD, 22 deg, 47% SOC

5/16 - 33.700 miles, 58 mohms per LeafDD, 31 deg, 76% SOC

10/5 - 39,300 miles, 100 mohms per LeafDD, 22 deg, 50% SOC

10/6 - 39,400 miles, 61 mohms per LeafDD, 30 deg, 51% SOC

10/7 - 39,500 miles, 80 mohms per LeafDD, 25 deg, 56% SOC

10/15 - 40,000 miles, 71 mohms per LeafDD, 27 deg, 45% SOC

10/30 - 41,000 miles, 74 mohms per LeafDD, 23 deg, 66% SOC

12/26/16 - 43,000 miles, 110 mohms per LeafDD, 13 deg, 77% SOC

6/10/17 - 49,600 miles, 89 mohms per LeafDD, 19 deg, 70% SOC

7/1/17 - 51,000 miles, 62 mohms per LeafDD, 33 deg, 44% SOC

8/15/17 - 53,400 miles, 61 mohms per LeafDD, 35 deg, 57% SOC

4/2/18 - 62,100 miles, 110 mohms per LeafDD, 18 deg, 94% SOC

6/13/18 - 65,000 miles, 84 mohms per LeafDD, 26 deg, 52% SOC

9/14/18 - 68,000 miles, 84 mohms per LeafDD, 27 deg, 57% SOC

10/30/18 - 70,000 miles, 93 mohms per LeafDD, 22 deg, 84% SOC

11/9/18 - 70,000 miles, 104 mohms per LeafDD, 22 deg, 89% SOC

11/30/18 - 70,400 miles, 88 mohms per LeafDD, 23 deg, 88% SOC

12/6/18 - 70,800 miles, 116 mohms per LeadDD, 13 deg, 33% SOC

1/30/19 - 72,300 miles, 86 mohms, per LeadDD, 23 deg, 45% SOC

5/29/19 - 74,476 miles, 102 mohms, per LeafDD, 19 deg, 89% SOC

#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs

#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F