Rechargeable battery pack with adaptive regenerative energy control and method thereof
First Claim
1. A method of operating a rechargeable battery pack using regenerative energy comprising the steps of:
- determining a regenerative energy parameter based on regenerative energy provided to the battery pack during operation over a plurality of charging cycles, said plurality of charging cycles interleaved with a plurality of discharging cycles; and
charging the battery pack based on the regenerative energy parameter during at least one of said plurality of charging cycles.
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Accused Products
Abstract
A charging strategy for a rechargeable battery pack is disclosed. The battery pack is used in an application that includes a dynamoelectric machine that may operate as a motor, drawing power from the battery pack, or as a generator, delivering regenerative energy to the battery pack. The strategy monitors the nature, intensity, duration and frequency, among other things, associated with encountered episodes of regenerative energy from the dynamoelectric machine, and adjusts subsequent recharging processes to allow a calculated amount of headroom to accommodate regenerative energy inputs in the future, which may be assumed to be equal in nature, intensity, duration and frequency to what has already been observed. Overcharging is reduced or eliminated, while maximizing the amount of charge on the battery pack, and thus duration of use.
52 Citations
16 Claims
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1. A method of operating a rechargeable battery pack using regenerative energy comprising the steps of:
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determining a regenerative energy parameter based on regenerative energy provided to the battery pack during operation over a plurality of charging cycles, said plurality of charging cycles interleaved with a plurality of discharging cycles; and
charging the battery pack based on the regenerative energy parameter during at least one of said plurality of charging cycles. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A rechargeable battery pack comprising:
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at least one battery cell configured to produce electrical power on a terminal thereof;
means for determining a regenerative energy parameter based on regenerative energy provided during regenerative energy intervals to said terminal of said battery pack during operation over a plurality of charging cycles, said plurality of charging cycles interleaved with a plurality of discharging cycles; and
means for controlling charging of said battery pack in accordance with said regenerative energy parameter based on at least one of said plurality of charging cycles. - View Dependent Claims (8, 9, 10, 11)
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12. A method of operating a rechargeable battery pack using regenerative energy, comprising the steps of:
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determining a regenerative energy parameter based on regenerative energy provided to the battery pack during operation, and charging the battery pack using the regenerative energy parameter, wherein said charging step includes the substeps of;
determining a charge headroom relative to a maximum state of charge of the battery pack;
using the determined regenerative energy parameter, calculating a charge termination voltage that corresponds to said charge headroom; and
charging the battery pack until the charge termination voltage is obtained. - View Dependent Claims (13, 14, 15, 16)
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Specification