Method and apparatus for determining depleted capacity of a battery
First Claim
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1. A method for determining depleted capacity of a CFx type battery in an implantable medical device, comprising the steps of:
- measuring an average value of battery voltage and an average value of battery current drawn from a CFx type battery during a measurement time having a length exceeding a battery voltage recovery time of said CFx type battery after a load change; and
determining actual depleted capacity of said CFx type battery from predetermined relationships between combinations of said average values of voltage and current and values of depleted capacity.
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Abstract
In a method and apparatus for determining the depleted capacity of a CFx type battery used in an implantable medical device, average values of battery voltage and battery current drawn from the battery are measured during a measurement time, the length of which exceeds a battery voltage recovery time after a load change, and wherein the actual depleted capacity of the battery is determined by predetermined relations between combinations of the average values of voltage and current and depleted battery capacity.
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Citations
15 Claims
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1. A method for determining depleted capacity of a CFx type battery in an implantable medical device, comprising the steps of:
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measuring an average value of battery voltage and an average value of battery current drawn from a CFx type battery during a measurement time having a length exceeding a battery voltage recovery time of said CFx type battery after a load change; and determining actual depleted capacity of said CFx type battery from predetermined relationships between combinations of said average values of voltage and current and values of depleted capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for determining depleted capacity of a CFx type battery in an implantable medical device, comprising:
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an averaging unit adapted for connection to a CFx type battery for measuring an average value of voltage drawn from said CFx type battery and an average value of current drawn from said CFx type battery during a measurement time having a length exceeding a battery voltage recovery time of said CFx type battery after a load change; and a determining unit connected to said averaging unit for determining actual depleted battery capacity of said CFx type battery from predetermined relationships between combinations of said average values of voltage and current and depleted battery capacity. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification