BATTERY MANAGEMENT SYSTEM AND METHOD
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Abstract
A battery management system can be provided which can include a plurality of battery management units connected in series and a host controller. Each battery management unit can include a battery cell, an isolation element, and at least one bypass element. The isolation element is connected with the battery cell in series, and the battery cell is isolated by turning off the isolation element. The bypass elements can be in parallel connection with the battery cell and isolation element, and the battery cell is bypassed by turning on the bypass element. A battery management method can include: activating the battery cell of the battery management unit by turning on the isolation element and turning off the bypass elements of the battery management unit; and deactivating the battery cell of the battery management unit by turning off the isolation element and turning on the bypass elements of the battery management unit.
35 Citations
42 Claims
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1-22. -22. (canceled)
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23. A battery management system, comprising:
a plurality of battery management units connected with each other in series, and each battery management unit comprising; a battery cell; one or more isolation elements connected with the battery cell in series for isolating the battery cell; and one or more bypass elements provided in a parallel connection with the battery cell and the one or more isolation elements for bypassing the battery cell; and a host controller coupled with the isolation elements and the bypass elements, wherein the host controller manages turning on and off of the isolation elements and the bypass elements to disconnect a first battery cell of a first battery management unit while keeping other battery cells of other battery management units activated, and to reconnect the first battery cell of the first battery management unit after a period of quiescent recovery of the first battery cell. - View Dependent Claims (24, 25, 26, 27)
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28. A battery management method for a battery management system which comprises a plurality of battery management units, wherein each of the battery management units has a battery cell, the battery management units being connected with each other in series, the method comprising:
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activating the battery cell of a respective unit of the battery management units by turning on an isolation element of the respective unit and turning off one or more bypass elements of the respective unit, after a period of quiescent recovery of the battery cell; and deactivating the battery cell of the respective unit by turning off the isolation element of the respective unit and turning on the one or more bypass elements of the respective unit, while maintaining other battery cells of other battery management units activated. - View Dependent Claims (29, 30, 31)
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32. A battery management method for a periodic cycling of a redundant battery cell of a battery cells series string to benefit from a quiescent recovery of the redundant battery cell, the method comprising:
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turning off an isolation element which is in a same battery management unit with the redundant battery cell for isolating the redundant battery cell; turning on at least one bypass element which is in the same battery management unit with the redundant battery cell for maintaining an overall connection of the battery cells series string; and after a quiescent recovery period, turning off the at least one bypass element and turning on the isolation element for reconnecting the redundant battery cell in the battery cells series sting. - View Dependent Claims (33, 34, 35)
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36. A battery management method for softly starting a battery management system which comprises a plurality of battery management units, wherein each of the battery management units has a battery cell, the management units being connected in a series string to reduce high inrush current spikes which may damage or reduce battery performance, the method comprising:
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activating a battery cell of a respective unit of the battery management units, by turning on an isolation element of the respective unit and turning off at least one bypass element of the respective unit, after a period of a quiescent recovery of the respective battery cell; and deactivating the respective battery cell of the respective unit, by turning off the isolation element of the respective unit and turning on the at least one bypass element of the respective unit, while keeping other battery cells of other battery management units activated; and activating the battery management units incrementally over a short time period on an initial demand. - View Dependent Claims (37, 38)
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39. A battery management method for a voltage regulation which comprises a plurality of battery management units connected in a series string, the method comprising:
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activating a battery cell of a respective unit of the battery management units, by turning on an isolation element of the respective unit and turning off at least one bypass element of the respective unit, after a period of quiescent recovery of the respective battery cell; and deactivating the respective battery cell of the respective unit, by turning off the isolation element of the respective unit and turning on the at least one bypass element of the respective unit, while keeping other battery cells of other battery management units activated; and activating or deactivating the battery management units incrementally at least one of (i) in response to an external demand;
or (ii) in response to an output from a photovoltaic panel or other varying voltage source.
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41. A battery management method for softly starting a battery management system which comprises a plurality of battery management units connected in a battery cells series string to reduce high inrush current spikes which may damage or reduce battery performance, the method comprising:
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turning off an isolation element which is in a same unit of the battery management units with a redundant battery cell for isolating the redundant battery cell; turning on at least one bypass element which is in the same unit with the redundant battery cell for maintaining an overall connection of the battery cells series string; and after a quiescent recovery period, turning off the at least one bypass element and turning on the isolation element for reconnecting the redundant cell in the battery cells series string; and activating the battery management units incrementally over a predetermined time period on an initial demand.
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42. A battery management method for a voltage regulation which comprises a plurality of battery management units connected in a battery cell series string, the method comprising:
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turning off an isolation element which is in a same unit of the battery management units with a redundant battery cell for isolating the redundant battery cell; turning on at least one bypass element which is in the same unit with the redundant battery cell for maintaining an overall connection of the battery cells series string; and after a quiescent recovery period, turning off the at least one bypass element and turning on the isolation element for reconnecting the redundant battery cell in the battery cells series string; and activating or deactivating the battery management units incrementally at least one of (i) in response to an external demand; and
(ii) during charging in response to an output from a photovoltaic panel or other varying voltage source.
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Specification