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Rapid Developmentof
Large Li-Ion Battery Packsusing
Off-the-ShelfBattery Management Systems
9/27/09, 1,
Custom or COTS?
Custom design you own you control
Commercial off-the-shelf (COTS) fast easy little development
9/27/09, 2,
Custom or COTS?
Ownership [%]
Cost & manuf. control [%]
Devel. cost [$k]
Devel. time [months]
Staff [people]
Learning curve [man-weeks]
Cost in qty [10$ / unit]
-200 -150 -100 -50 0 50 100
Off-the-shelfCustom
9/27/09, 3,
BMS chips
9/27/09, 4,
Cell selection
Small cylindrical Pouch
Large cylindrical Prismatic
9/27/09, 5,
Topology selection
Centralized Modular
Master-slave Distributed
9/27/09, 6,
Complexity selection
Simple analog go/no go dumb 2.5~10 $ / cell (20 cells)