Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2007-12-19
2009-10-20
Assouad, Patrick J (Department: 2858)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S125000, C320S136000
Reexamination Certificate
active
07605566
ABSTRACT:
A battery backup system includes a control device including a power sensing device, a discharge circuit, a charging circuit, and a plurality of battery packs. A lower threshold is established representative of a minimum acceptable effective energy capacity. Each battery pack is recharged if its effective energy capacity falls below the lower threshold. Additionally, an upper threshold is established representative of the minimum acceptable effective energy capacity plus a performance margin. In a two battery-pack system, if both battery packs fall below the upper threshold, the battery with the least effective energy capacity is discharged to the minimum acceptable effective energy capacity and then recharged to the battery pack's maximum energy capacity. In this way, both battery packs are prevented from approaching the minimum acceptable effective energy capacity at the same time. This reduces the size or number of battery packs and reduces their associated cost and volume.
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Assouad Patrick J
Diao M′Baye
International Business Machines - Corporation
Quarles & Brady LLP.
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