A123

Bikini Pack (10kWh)

Bikini

20Ah Prismatic

http://www.greencarcongress.com/2009/05/a123-prismatic-20090519.html

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 (see Range)	23.76 kWhrs
20C sag Capacity (~97%)	23 kWhrs (although with 14p we will not exceed 9C to provide our max 280A)
Number	(75s14p) x 3 = 3150 cells (810V max and 742V nominal)
Weight (excluding interconnects)	2988 x .072 kg = 226.8 kg (with 16p would be 259.2 kg and 27.3 kWhrs)

Likely A123 50V battery (containing 210 cells)

• 14 parallel x 15 series
• 49.5 V
• 32.2 Ah
• 1.59 kWh
• 14.7 kg + interconnects, packaging and BMS

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

• 742 V nominal (810 V peak)
• 32.2 Ah
• 23.89 kWh
• 220.5 kg + interconnects, packaging and BMS (will be under 300kg)
• Total pack contains 3150 individual M1 cells

Possible smaller 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

Welding them together

• Bill Dube recommends 4000A, for up to 35ms with 14 lbs of force.
• 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
• 2SSIC's new A123 pack and further discussion, don't miss more information
• Need a head like this (e.g. 88A or 188A) and a welder to drive it .

Recommended reading:

• http://www.jesk.co.jp/product_search/miyachi/katarogu/katarogue/resistance-synthesis/sougou.pdf
• http://www.tjsnow.com/supplies/miyachi/cpt_freq_invert.htm
• http://www.tjsnow.com/supplies/miyachi/powers_tran_table.htm
• http://wikileaks.org/wiki/Toyota_Prius_A123_car_fire_investigation_report_2008
• BMS.WebHome links to a discussion about welding cells together

Materials

• Nickel

-- Main.PhilipCourt - 09 Feb 2008

1480Wh 50V (13p15s): <img width="400" alt="GS_1480_50V_(13p15s)_small.jpg" src="/twiki/pub/ElectricSaker/A123/GS_1480_50V_(13p15s)_small.jpg" height="469" />

A123 M1 dimensions: <img width="372" alt="A123_M1_cell_dimensions.png" src="/twiki/pub/ElectricSaker/A123/A123_M1_cell_dimensions.png" height="534" />

A123 32 Series Automotive Class Lithium Ion

Some information collected from here:

• AHR32113M1Ultra 32mm x 113mm, capacity 7000mAh (4000mAh, 30C continous, 185g)
• AHR32157M1HD 32mm x 157mm, capacity 10000mAh

5600mAh to 7000mah (170g?) and 7800mAh to 10000mah (240g?) but of course that takes no account of other differences in their internal formulation and construction.