DESIGN: ~ Electrotor-SloMo ~ Power Storage - Battery - Details

• PC says that many packs in parallel is better than fewer larger packs. This is because there is greater reliability and less copper (by weight) is required to join the batteries.

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Like most lead acid batteries they are not rated at the 1 hour rate, more like the 10 hr rate, which says you can draw 1.5 amps for 10 hours. There is a big difference when you are talking raw power that can be supplied.

http://www.batteryuniversity.com/partone-16.htm

http://www.mpoweruk.com/ A lot of information

• Have printout of section on 'Performance Characteristics', In AeroVantage - Power Storage binder.

 If the discharge takes place over a long period of several hours as with some high rate applications such as electric vehicles, the effective capacity of the battery can be as much as double the specified capacity at the C rate.

• A typical small electric car will use between 150 to 250 Watthours of energy per mile with normal driving. Thus, for a range of 100 miles at 200 Watthours per mile, a battery capacity of 20 KWh will be required.
• Hybrid electric vehicle use smaller batteries but they may be required to operate at very high discharge rates of up to 40C. If the vehicle uses regenerative braking the battery must also accept very high charging rates to be effective. See the section about Capacitors for an example of how this requirement can be accommodated.

http://www.mpoweruk.com/cell_construction.htm#tradeoff

For a given cell chemistry and within the space available inside a given cell case, the cell performance can be optimised for capacity or power.

• Increasing the surface area of the electrodes increases the cell's current handling capability. Thus the cell can both deliver more power and it can be charged more quickly.
• Increasing the volume of electrolyte in the cell increases the cell's energy storage capacity.

The prime trade off is between the area of the electrodes and the volume of the electrolyte which can be contained within the volume available in the cell case.

High power cells require electrodes with a large surface area as well as enlarged current collectors which take up more of the available space within a given cell, displacing the electrolyte and reducing the cell capacity.

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UBC affiliation

http://www.globenewswire.com/newsroom/news.html?d=87017

EPOD International Inc.

CONTACT: 
EPOD International Inc.
Brett Walker
Telephone: (604) 669-0600
Fax: (604) 662-4929

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"bipolar lead-acid" "high power density"

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• The ambient temperature has an effect on the performance of batteries.

• OTHER: Electrical - Power Storage - Battery
• See: AeroVantage - Power Storage binder.
• For information on the electrical characteristics of bus bars see Excel Spreadsheet in C:///Working Data/[search on 'lugs.xls']

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