Rechargeable battery life judging method
First Claim
1. A method of judging the life of a rechargeable battery, said rechargeable battery being used while charge and discharge are repeatedly performed therefor, wherein when said rechargeable battery is charged with electricity, an internal resistance of said rechargeable battery is measured in a state in which a remaining power of said rechargeable battery has a predetermined capacity, and the value of the internal resistance with passage of time is obtained, thereby judging the life of said rechargeable battery based on the change of the value of the internal resistance with passage of time.
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Abstract
In a method of judging the life of a rechargeable battery, the rechargeable battery being used while charge and discharge are repeatedly performed therefor, an internal resistance (R) is measured in a state in which a remaining power of the rechargeable battery during a charge phase of the rechargeable battery becomes in the range of 30 to 85% of the capacity in a full charge state, and the life of the rechargeable battery is judged based on a change of the value of the internal resistance (R) with passage of time.
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3 Claims
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1. A method of judging the life of a rechargeable battery, said rechargeable battery being used while charge and discharge are repeatedly performed therefor,
wherein when said rechargeable battery is charged with electricity, an internal resistance of said rechargeable battery is measured in a state in which a remaining power of said rechargeable battery has a predetermined capacity, and the value of the internal resistance with passage of time is obtained, thereby judging the life of said rechargeable battery based on the change of the value of the internal resistance with passage of time.
Specification