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US Patent 6114835 - Multi-cell battery pack charge balancing circuit
US Patent Issued on September 5, 2000
Estimated Patent Expiration Date:
July 26, 2019Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
July 26, 2019Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA charge balancing circuit incorporates a voltage threshold which determines when to initiate a charge balance mode in order to equalize the level of charge in at least two cells of a multi-cell battery pack. Charge balancing is initiated when the voltage level of a first cell reaches this second threshold. Charge balancing then continues by modifying the charges of the first balance cell and a second reference lesser charged cell until the voltage levels of the first and second cells are equal. A subsequent charge cycle will result in the cell with the greatest charge being balanced with another of lesser charge. In this manner, all of the cells of a multi-cell battery pack are charge balanced over the course of plural charge cycles. | InventorAssigneeApplicationNo. 360746 filed on 07/26/1999US Classes:320/118With discharge of cells or batteriesField of Search320/118, With discharge of cells or batteries320/119With individual charging of plural batteries or cellsExaminersPrimary: Wong, Peter S.Assistant: Tibbits, Pia Attorney, Agent or FirmUS Patent References4053824, Method and device for checking a storage batteryIssued on: 10/11/1977 Inventor: Dupuis, et al.5578914, Charging system for multi-cell battery Issued on: 11/26/1996 Inventor: Morita6043628Management process for electrical energy storage battery systemsand control arrangement for application of the process Issued on: 03/28/2000 Inventor: Perelle, et al. International ClassH02J 007/00 |
