Leaf battery degradation case A: AZE0 24 kW⋅h—part 2 2020-10

Posted on 11 January 2021 in Electric vehicles

Part 2 in a series following the state of health (SoH) degradation of a Nissan Leaf AZE0 24 kW⋅h battery.

Vehicle specification:

Vehicle:Nissan Leaf
Type:ZAA-AZE0
MY:2013

Articles in the series Nissan Leaf battery degradation case A: AZE0 24 kW⋅h:

  1. Part 1 2019-10.
  2. Part 2 2020-10 (this article).

Summary

2019-10/2020-10
Period Distance ∆SoH
12 months 8 421 km −2.77 pp
  • A series of DC fast charges gave the SoH a temporary boost of 4.10 percentage points.
  • In the year ending October 2019 the vehicle travelled 8 421 km and the SoH reduced by 2.77 percentage points.

Data

Battery parameters were recorded using Leaf Spy for Android. The table below shows the battery parameters for the year ending October 2020.

Battery degradation 2019-10/2020-10 as recorded by Leaf Spy.
Date Odometer (km) A⋅h SoH (%) Hx (%) Fast charges Type 1,2 charges
2019-10-07 31060 55.31 84.53 77.15 12 1160
2019-10-12 31873 57.96 88.63 83.85 21 1173
2019-10-20 32013 57.05 87.24 82.10 21 1176
2019-10-27 32184 56.45 86.32 80.94 21 1178
2019-11-03 32322 55.99 85.61 80.04 21 1179
2019-12-01 33031 55.16 84.35 78.46 21 1189
2019-12-09 33309 55.28 84.52 78.67 22 1192
2019-12-15 33463 55.05 84.18 78.24 23 1199
2019-12-22 33661 55.90 85.47 79.87 25 1206
2020-03-10 35585 54.45 83.26 77.15 25 1275
2020-08-23 38123 54.09 82.71 76.50 27 1359
2020-10-25 39481 53.48 81.77 75.38 27 1396

Battery degradation 2019-10/2020-10 CSV file.

Observations

  1. The count of Type 1 and 2 charges is higher than actual due to the Leaf's built-in charge timer recording one charge when the vehicle is plugged in, and a second when the timer initiates charging.
  2. The increase in SoH from 84.53% to 88.63% in October 2019 is due to nine quick charges with in a 36 hour period while making the delivery journey.
  3. In the year ending October 2019 the vehicle travelled 8 421 km and the SoH reduced 2.77 percentage points.