Mitigating premature wear out of a rechargeable battery
First Claim
1. A computer-implemented method of tracking and moderating a rate of battery wear out, the method comprising:
- determining an actual rate of decreasing charge capacity of a rechargeable battery that exhibits a decreasing full charge capacity;
comparing the actual rate of decreasing charge capacity to a projected rate of decreasing charge capacity for the battery to determine whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity; and
if the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity, modifying one or more variable parameters to slow down the actual rate of decreasing charge capacity of the battery such that the actual rate of decreasing charge capacity remains within a range of the projected rate of decreasing charge capacity, wherein;
assigned values of the one or more variable parameters affect the rate of decreasing charge capacity; and
modifying the one or more variable parameters includes changing a value of at least one variable parameter to provide updated parameter values and reducing a fast charge current and a termination voltage used to charge the rechargeable battery in order to decrease the temperature induced stress on the battery when the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity due to temperature induced stress; and
charging and discharging the battery utilizing the updated parameter values of the at least one variable parameter.
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Accused Products
Abstract
A computer-implemented method and information handling system manage a rate of decreasing full capacity of a rechargeable battery by using a projected/target rate of decreasing charge capacity for the battery. The method includes determining an actual rate of decreasing charge capacity of the battery, comparing the actual rate of decreasing charge capacity to the projected/target rate of decreasing charge capacity to determine whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity, and if the actual rate of decreasing charge capacity is greater than the projected/target rate of decreasing charge capacity, modifying one or more variable parameters to slow down the actual rate of decreasing charge capacity of the battery such that the actual rate of decreasing charge capacity remains within a range of the projected/target rate of decreasing charge capacity, and charging and discharging the battery using the modified parameters.
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Citations
19 Claims
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1. A computer-implemented method of tracking and moderating a rate of battery wear out, the method comprising:
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determining an actual rate of decreasing charge capacity of a rechargeable battery that exhibits a decreasing full charge capacity; comparing the actual rate of decreasing charge capacity to a projected rate of decreasing charge capacity for the battery to determine whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity; and if the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity, modifying one or more variable parameters to slow down the actual rate of decreasing charge capacity of the battery such that the actual rate of decreasing charge capacity remains within a range of the projected rate of decreasing charge capacity, wherein;
assigned values of the one or more variable parameters affect the rate of decreasing charge capacity; and
modifying the one or more variable parameters includes changing a value of at least one variable parameter to provide updated parameter values and reducing a fast charge current and a termination voltage used to charge the rechargeable battery in order to decrease the temperature induced stress on the battery when the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity due to temperature induced stress; andcharging and discharging the battery utilizing the updated parameter values of the at least one variable parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An information handling system comprising:
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a battery management unit having an embedded controller; a rechargeable battery having a decreasing full charge capacity; a charger; a computer-readable storage device embodying computer program instructions executable by a processor and configured to cause the battery management unit to; determine an actual rate of decreasing charge capacity of the battery; compare the actual rate of decreasing charge capacity to the projected rate of decreasing charge capacity to determine whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity; if the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity, modify one or more variable parameters to slow down the actual rate of decreasing charge capacity of the battery such that the actual rate of decreasing charge capacity remains within a range of the projected rate of decreasing charge capacity with each repeated charge and discharge; wherein;
assigned values of the one or more variable parameters affect the rate of decreasing charge capacity; and
modifying the one or more variable parameters includes changing a value of at least one variable parameter to provide updated parameter values;wherein, in response to the actual rate of decreasing charge capacity being greater than the projected rate of decreasing charge capacity due to discharging current induced stress, the BMU modifying the one or more variable parameters further includes the BMU reducing at least one of;
a processor maximum operating frequency to decrease the current induced stress on the battery; and
a number of concurrently executing applications supported; andcharge and discharge the rechargeable battery using the modified one or more variable parameters. - View Dependent Claims (11, 12, 13, 14)
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15. A computer-readable storage device embodying computer program code, the computer program code comprising computer executable instructions configured for:
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determining an actual rate of decreasing charge capacity of a rechargeable battery that exhibits a decreasing full charge capacity; comparing the actual rate of decreasing charge capacity to a projected rate of decreasing charge capacity for the battery to determine whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity; if the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity, modifying one or more variable parameters to slow down the actual rate of decreasing charge capacity of the battery such that the actual rate of decreasing charge capacity remains within a range of the projected rate of decreasing charge capacity, wherein modifying the one or more variable parameters includes determining whether the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity due to voltage induced stress, charging current induced stress, discharging current induced stress, or temperature induced stress; wherein assigned values of the one or more variable parameters affect the rate of decreasing charge capacity and modifying the one or more variable parameters includes changing a value of at least one variable parameter to provide updated parameter values; reducing a termination voltage used when charging the rechargeable battery in order to decrease the voltage induced stress on the battery when the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity due to voltage induced stress; reducing a fast charge current used to charge the rechargeable battery in order to decrease the current induced stress on the battery when the actual rate of decreasing charge capacity is greater than the projected rate of decreasing charge capacity due to current induced stress; and charging and discharging the battery utilizing the updated parameter values of the at least one variable parameter. - View Dependent Claims (16, 17, 18, 19)
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Specification