MIT 2 009 - Product Engineering Processes (19 pages)

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Product Engineering Processes



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Product Engineering Processes

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Pages:
19
School:
Massachusetts Institute of Technology
Course:
2 009 -

Unformatted text preview:

Product Engineering Processes Battery Primer A short battery primer Handbook of batteries Linden and Reddy Short Primer on Batteries Types Primary dry cell non rechargeable low power applications infrequent use Secondary rechargeable high discharge rates frequent use Short Primer on Batteries Selection considerations Physical characteristics size shape weight Voltage nominal maximum minimum discharge profile Load current rate constant power constant resistance pulsed Duty cycle continuous intermittent cyclic Charge discharge cycle cycling float deep cycle efficiency of charging Temperature range maximum minimum and nominal Service life required operation time Safety failure rates leakage off gassing toxicity disposal Environment vibration acceleration orientation Maintenance regular upkeep replacement Cost initial life cycle cost Short Primer on Batteries Cell voltage Cell voltage 4 5 4 3 5 Voltage V 3 2 5 2 1 5 1 0 5 0 Alkaline p Lead acid s Nickel Cadmium s Battery type Nickel metal hydride s Lithium ion s Short Primer on Batteries Specific energy Specific energy 160 Specific energy Wh kg 140 120 100 80 60 40 20 0 Alkaline p Lead acid s Nickel Cadmium s Battery type Nickel metal hydride s Lithium ion s Short Primer on Batteries Energy density Energy density 450 400 Energy density Wh l 350 300 250 200 150 100 50 0 Alkaline p Lead acid s Nickel Cadmium s Battery type Nickel metal hydride s Lithium ion s Short Primer on Batteries Self discharge Shelf life Shelf life months 20 Celcius 60 50 40 30 20 10 0 Alkaline p Lead acid s Nickel Cadmium s Nickel metal hydride s Battery type Lithium ion s Short Primer on Batteries Estimated cycle life Typical cycle life Typical cycle life discharge charge cycles 1200 1000 800 600 400 200 0 Alkaline p Lead acid s Nickel Cadmium s Battery type Nickel metal hydride s Lithium ion s Short Primer on Batteries Temperature range Operating temperature 80 Temperature Celcius 60 40 20 0 Alkaline p Lead acid s Nickel Cadmium s 20 40 60



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