A123

A123 M1 cell

   Nominal voltage: 3.3 V
   Nominal capacity: 2.3 Ah
   Energy: 7.59 Wh
   Weight: 0.07 kg
   Dimensions: 65.15mm x 25.85 mm diameter

• DOD behavior
• A123 Safety
• Energy and Power Density (M1 = 108.4 Wh/kg, 3300 W/kg, 5800 W/l)

Original A123 cell (M1 specification sheet) - How big, how many and how heavy?

Description	Details
Target Nominal Capacity	22.69 kWhrs
20C sag Capacity	22 kWhrs
Number	(83s12p) x 3 = 2988 cells (896.4V max and 821.7V nominal, 805V 20C sag)
Weight	2988 x .072 kg = 215 kg (would be 287 kg with 16p ~ 30 kWhrs)

Possible A123 50V battery (containing 195 cells)

• 13 parallel x 15 series
• 49.5 V
• 29.9 Ah
• 1.48 kWh
• 13.65 kg + interconnects, packaging and BMS

We would want 15 of these in series to give us the following total pack:

• 742 V nominal
• 29.9 Ah
• 22.2 kWh
• 204.7 kg + interconnects, packaging and BMS (will be well under 300kg)
• Total pack contains 2925 individual M1 cells

Another slightly bigger A123 50V battery (containing 240 cells)

• 15 parallel x 16 series
• 52.8 V
• 34.5 Ah
• 1.82 kWh
• 16.8 kg + interconnects, packaging and BMS

We would want 15 of these in series to give us the following total pack:

• 792 V nominal
• 34.5 Ah
• 27.32 kWh
• 252 kg + interconnects, packaging and BMS (should still be under 300kg)
• Total pack contains 3600 individual M1 cells

Welding them together

• Bill Dube recommends 4000A, not sure for how long but 8ms is in the ball park.
• Video of the method used on the KillaCycle, note pneumatic actuated head for constant pressure
• Killacycle battery pack construction and a picture of the finished product before installation into the box.
• Miyachi newsletter with an article on their welders being used for the Killacycle pack
• EVDL Discussion
• Another EVDL Discussion
• EVDL again... - Bill provides info for sizing cables etc
• Need a head like this and a welder to drive it.

-- Main.PhilipCourt - 09 Feb 2008

1480Ah 50V (13p15s):

A123 M1 dimensions: