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US Patent 6518725 - Charge balancing system
US Patent Issued on February 11, 2003
Estimated Patent Expiration Date:
July 11, 2022Estimated 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 11, 2022Estimated 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.AbstractThe problem of battery failure due to failure of one cell in a rechargeable battery, and the related problem of inefficient use of a battery over its dynamic range due to differences between the performance of cells in a battery, are addresses by providing one or more capacitors selectively coupled to the various cells of the battery. The selective and repetitive coupling of capacitors to the cells permits balancing of charge among the cells. This minimizes the risk that any one cell would suffer catastrophic failure due to being fully charged or discharged prior to the other cells in the battery. This also permits making use of the battery over nearly all of its dynamic range. In this way, battery life is maximized. | InventorAssigneeApplicationNo. 181851 filed on 07/11/2002US Classes:320/116, SERIALLY CONNECTED BATTERIES OR CELLS320/118With discharge of cells or batteriesField of Search320/116, SERIALLY CONNECTED BATTERIES OR CELLS320/117, Switchable to parallel connection320/118, With discharge of cells or batteries320/119, With individual charging of plural batteries or cells320/121, Switchable cells (e.g., for voltage regulation, etc.)320/166CAPACITOR CHARGING OR DISCHARGINGExaminersPrimary: Sherry, Michael J.Assistant: Luk, Lawrence Attorney, Agent or FirmUS Patent References5710504, Switched capacitor system for automatic battery equalizationIssued on: 01/20/1998 Inventor: Pascual, et al.6081095, Voltage balancer device for combination battery Issued on: 06/27/2000 Inventor: Tamura, et al.6121751Battery charger for charging a stack of multiple lithium ion battery cells Issued on: 09/19/2000 Inventor: Merritt Foreign Patent References
International ClassH02J 007/00 |
