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LEAF’s Battery Pack
Key Figures:
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•
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•
•
•

48 modules (in series)
660 lbs total weight
360 V nominal voltage
24 kWh rated capacity (66 Ah)
...
AESC Module - Key Figures:

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•
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8.3 lbs per module
4 cells per module (2 in series, 2 in parallel)
7.5 V nominal vo...
AESC Cell - Key Facts:
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1.8 lbs per cell
3.8 V nominal voltage
125 Wh rated capacity (33 Ah)
2 x better co...
Battery Model # 1:
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3 modules per battery gauge bar (1.5 kWh)
16 bars total
12 bars visible
2 bars reserve
2 b...
Battery Model # 2:
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75 Wh per SOC tick
320 total SOC ticks
281 available SOC ticks
kWh remaining: SOC ticks x 75 W...
Range Estimate:
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Range: kWh remaining x miles/kWh (Energy Economy)
Environmental factors (temps, tire pressure, driv...
Accuracy & Predictability:
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Flat discharge characteristic
Linear SOC tick characteristic
95% model accuracy
Fun Stats:
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4.10V cell voltage when full
4.04V cell voltage at 80%
17% (4 kWh) reserve capacity

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3.92V est. c...
Sources:

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AESC (Nissan and NEC)
MNL forum
Volt forum
Data samples from LEAF owners
Links:

1. http://www.eco-aesc-lb.com/en/product.html
2. http://gm-volt.com/forum/showthread.php?5243-Volt-thermalmanageme...
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Nissan LEAF Battery Pack - Initial Analysis

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Nissan LEAF Battery Pack - Initial Analysis

  1. 1. LEAF’s Battery Pack
  2. 2. Key Figures: • • • • • • 48 modules (in series) 660 lbs total weight 360 V nominal voltage 24 kWh rated capacity (66 Ah) 21 kWh available capacity 192 laminated prismatic cells
  3. 3. AESC Module - Key Figures: • • • • • 8.3 lbs per module 4 cells per module (2 in series, 2 in parallel) 7.5 V nominal voltage 0.5 kWh rated capacity (66 Ah) $662 retail price
  4. 4. AESC Cell - Key Facts: • • • • • • • • 1.8 lbs per cell 3.8 V nominal voltage 125 Wh rated capacity (33 Ah) 2 x better cooling than traditional cylindrical cells LiMn2O4 with LiNiO2 cathode (Nippon Denko) Graphite anode (Hitachi Chemicals) LiPF6 EC type electrolyte (Tomiyama) Celgard PP dry separator
  5. 5. Battery Model # 1: • • • • • • 3 modules per battery gauge bar (1.5 kWh) 16 bars total 12 bars visible 2 bars reserve 2 bars silent (1x top, 1x bottom) kWh remaining: (visible bars + 2) x 1.5 kWh
  6. 6. Battery Model # 2: • • • • 75 Wh per SOC tick 320 total SOC ticks 281 available SOC ticks kWh remaining: SOC ticks x 75 Wh / 1000
  7. 7. Range Estimate: • • • Range: kWh remaining x miles/kWh (Energy Economy) Environmental factors (temps, tire pressure, driver, wind) Reset energy economy gauge before the trip or trip segment
  8. 8. Accuracy & Predictability: • • • • Flat discharge characteristic Linear SOC tick characteristic 95% model accuracy
  9. 9. Fun Stats: • • • 4.10V cell voltage when full 4.04V cell voltage at 80% 17% (4 kWh) reserve capacity • • • 3.92V est. cell voltage at 50% 0.40V est. voltage drop from 12 to 1 bars 30mV est. voltage drop per visible bar • • 85% charging efficiency at 240V (3 kWh / 60 mins) 75% charging efficiency at 120V (1 kWh / 60 mins)
  10. 10. Sources: • • • • AESC (Nissan and NEC) MNL forum Volt forum Data samples from LEAF owners
  11. 11. Links: 1. http://www.eco-aesc-lb.com/en/product.html 2. http://gm-volt.com/forum/showthread.php?5243-Volt-thermalmanagement-system-temperature-band&p=43562#post43562 3. http://www.mynissanleaf.com/viewtopic.php?f=31&t=4295 4. http://www.mynissanleaf.com/viewtopic.php?f=44&t=4760 5. http://green.autoblog.com/2011/08/03/need-to-replace-anissan-leaf-battery-hows-19-392-31-753-u/ 6. http://www.youtube.com/watch?v=FiyRxxbkHH0 7. http://www.mynissanleaf.com/viewtopic.php?f=9&t=2265 8. http://www.no-url.com/LEAF/LevelIIICharging_01-30-11.html

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