System and method for balancing charge cycles for batteries or multiple-cell battery packs
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United States of America Patent
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Jul 6, 1999
Grant Date -
N/A
app pub date -
May 5, 1997
filing date -
May 5, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A charging system and method are disclosed that provide balanced charge cycles for batteries or multiple-cell battery packs by using a controller, a charging source gate, multiple adjustable shunting devices and multiple charge monitors. During a virgin charge cycle, the controller adjusts each of the adjustable shunting devices to provide a maximum charging current, opens the charging source gate, and then monitors the charge level of each of the battery cells. When the voltage potential of one of the battery cells reaches a threshold value, the charge source gate is closed to disable the charging current, and the fully charged battery cell is identified. The controller then determines a shunt value for adjusting the adjustable shunting device connected to the fully charged battery cell and uses this shunt value on the next charge cycle. Each subsequent charge cycle results in a different battery cell becoming fully charged and then the recalculation of a shunt value. The overall effect is to allow each battery or each cell of a battery pack to be periodically fully charged, regardless of the variations in the charging, discharging and efficiency characteristics of the batteries or battery cells.
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