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Complete battery-pack design for one-or two-cell portable applications

Posted: 18 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:TI application note? battery-pack design? portable applications?

Although voltage measurement alone has been used in many portable products to approximate the remaining capacity of the battery, this method may have an error of up to 50 percent. The relationship between cell voltage and capacity will vary as a function of discharge rate, temperature, and cell aging. For example, a high discharge rate results in a greater voltage drop than a low discharge rate for the same depletion in capacity. Similar characteristics can be noticed when a cell is discharged at varying temperatures. With the growing demand for products with longer runtimes, system designers need a more accurate solution. Using a gas-gauge IC to measure the charge that enters or leaves a battery will provide a much better estimate of battery capacity over a broad range of application power levels.

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