1
\$\begingroup\$

I found many websites as this one where all details regarding battery packs for 24, 30 and 40 kWh batteries of Nissan Leaf models are stated, while I could not find information regarding the battery weight of 62 kWh model.

Battery weight of 40 kWh model is done according to the battery module weight and number of modules, which is 8.7 kg x 24 = 208 kg. Since number of modules is different regarding newer Leaf model, does anyone know how to properly scale its weight?

\$\endgroup\$
5
  • \$\begingroup\$ Why do you need to know? \$\endgroup\$ – Bruce Abbott Apr 30 '20 at 0:29
  • \$\begingroup\$ call a Nissan service location \$\endgroup\$ – jsotola Apr 30 '20 at 0:43
  • \$\begingroup\$ @BruceAbbott I am interested in thermal parameters of the battery \$\endgroup\$ – robmiller505 Apr 30 '20 at 0:57
  • \$\begingroup\$ What does the weight tell you about the thermal parameters? \$\endgroup\$ – pjc50 Apr 30 '20 at 8:23
  • 2
    \$\begingroup\$ I’m voting to close this question because it's not a valid question for this EE site. \$\endgroup\$ – Andy aka Apr 30 '20 at 9:41
2
\$\begingroup\$

According to PUSHEVS, the specs of the 40 kWh and 62 kWh batteries are:-

40 kWh battery

Total battery capacity: 39,46 kWh
Usable battery capacity: 36 kWh (91 %)
Battery weight: 303 kg
Battery energy density: 130 Wh/kg
Cells: 192 (96s2p)
Chemistry: NCM 523
Manufacturer: Envision AESC
TMS: passive air cooling


62 kWh battery

Total battery capacity: 62 kWh
Usable battery capacity: 56 kWh (90 %)
Battery weight: 410 kg (estimation)
Battery energy density: 151 Wh/kg (estimation)
Cells: 288 (96s3p)
Chemistry: NCM 523
Manufacturer: Envision AESC
TMS: passive air cooling

If these figures are accurate then the weight scales up by ~87% of the capacity. However this may just be an artifact of how the 62 kWh battery weight was estimated.

Another (possibly less accurate but more reliable) measurement could be taken from the difference in curb weights between the 40 kWh and 62 kWh models, which is 1729 kg - 1573 kg = 156 kg more for the SV+ vs SV. Based on that the 62 kWh battery is 51% heavier, so it scales at 98% of the capacity (ie. almost 1:1).

\$\endgroup\$
0
\$\begingroup\$

For rough thermal calculations, such as lump sum temperature rise, I would trust a linear scaling:

$$62 \, kWh \times \frac{208 \text{kg}}{\text{24 kWh}} = 547 \,kg$$

FYI: An EV's battery pack is actually over-rated in its nominal capacity to sustain lifetime performance. For example, the 24 kWh battery pack may actually contain 48 kWh worth of battery cells.

When the car is brand new and all cells are fresh (100% rated capacity), the battery management system (BMS) will only permit the car to "use" half the cells. As these cells degrade and lose capacity over time, the BMS will "unlock" more cells for use by the powertrain.

This ensures a nominal 24 kWh over the lifetime of the battery pack.

\$\endgroup\$

Not the answer you're looking for? Browse other questions tagged or ask your own question.