Battery life estimation
First Claim
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1. A method of estimating battery lifetime, the method comprising:
- monitoring a charge characteristic of a battery during a first time period corresponding to a type of battery event;
monitoring an operating condition of the battery wherein the operating condition depends on the type of battery event of the first time period;
calculating a first battery life decrement caused by the type of battery event of the first time period based on the monitored operating condition of the battery, the monitored charge characteristic, and a duration of the first time period;
determining an overall battery life value by combining the first battery life decrement and a second battery life decrement for a second time period wherein the second time period is prior to the first time period and corresponds to at least one prior occurrence of the same type of battery event of the first time period; and
estimating a remaining battery lifetime for the battery based on the overall battery life value.
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Abstract
A method of estimating battery lifetime includes monitoring a charge characteristic of a battery during a first time period, monitoring an operating condition of the battery, determining a first battery life value for the first time period based on the operating condition of the battery, the charge characteristic, and a duration of the first time period, determining an overall battery life value using the first battery life value and a second battery life value for a second time period, and estimating a remaining battery lifetime for the battery based on the overall battery life value.
41 Citations
21 Claims
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1. A method of estimating battery lifetime, the method comprising:
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monitoring a charge characteristic of a battery during a first time period corresponding to a type of battery event; monitoring an operating condition of the battery wherein the operating condition depends on the type of battery event of the first time period; calculating a first battery life decrement caused by the type of battery event of the first time period based on the monitored operating condition of the battery, the monitored charge characteristic, and a duration of the first time period; determining an overall battery life value by combining the first battery life decrement and a second battery life decrement for a second time period wherein the second time period is prior to the first time period and corresponds to at least one prior occurrence of the same type of battery event of the first time period; and estimating a remaining battery lifetime for the battery based on the overall battery life value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for estimating battery lifetime, the apparatus comprising:
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a battery monitor configured to monitor a charge characteristic of a battery during a first time period corresponding to a type of battery event; a life value module coupled to the battery monitor and configured to monitor an operating condition of the battery wherein the operating condition depends on the type of battery event of the first time period, calculate a first battery life decrement caused by the type of battery event of the first time period based on the monitored operating condition of the battery, the monitored charge characteristic, and a duration of the first time period, and determine an overall battery life value by combining the first battery life decrement and a second battery life decrement for a second time period wherein the second time period is prior to the first time period and corresponds to at least one prior occurrence of the same type of battery event of the first time period; and a remaining life module coupled to the life value module and configured to estimate a remaining battery lifetime for the battery based on the overall battery life value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for estimating battery lifetime, the apparatus comprising:
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a battery monitor configured to monitor a float voltage applied to a battery during a first time period wherein the first time period corresponds to a float charge event and monitor a charge characteristic of the battery; a float life value module coupled to the battery monitor and configured to monitor an operating condition of the battery wherein the operating condition depends on the float charge event monitored during the first time period, determine a first float life contribution based on the operating condition of the battery, the float voltage, and a duration of the first time period, and determine an overall float life value combining the first float life contribution and a second float life contribution for a second time period wherein the second time period corresponds to at least one float charge event prior to the float charge event of the first time period; a cycle life value module coupled to the battery monitor and configured to determine, for a third time period wherein the third time period corresponds to a charge cycle event, a rate and/or depth of discharge of the battery, determine an estimated number of discharge cycles based on the discharge rate and/or the depth of discharge, determine a first cycle life contribution for the third time period based on the estimated number of discharge cycles, and determine an overall cycle life value combining the first cycle life contribution and a second cycle life contribution for a fourth time period wherein the fourth time period corresponds to at least one charge cycle event prior to the charge cycle event of the third time period; and a remaining life module coupled to the float life value module and the cycle life value module and configured to estimate a remaining battery lifetime for the battery based on the overall float life value and the overall cycle life value.
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Specification