Method and apparatus for determining the performance capabilities of secondary batteries
First Claim
1. The method of determining the capability of a rechargeable battery to deliver its rated load comprising the steps ofproviding a predetermined battery load,establishing a reference voltage representative of the terminal voltage of a good, fully-charged battery of the type being tested immediately upon being connected to a load equal to said predetermined load,for a predetermined time period cyclically connecting and disconnecting said predetermined load from said terminals to produce successive on-periods and off-periods, the frequency of said cyclical load being between 10 and 50 Hz,measuring an ending terminal voltage during an on-period at the end of said time period, andcomparing said ending terminal voltage with said reference voltage as a measure of the capability of said battery to deliver its rated load.
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Abstract
A constant current load is cyclically applied to the battery terminals for about one minute, each load portion of the cycles having a current approximately equal to the rated ampere hour load of the battery and having a duration of about 34 milliseconds in which the load is connected for about 17 milliseconds and disconnected for an equal period. The load current is approximately equal to the rated ampere load of the battery under test. An output indicator denotes the final terminal voltage under load as a percentage of a reference voltage equal to the terminal voltage of an ideal battery of the same kind when fully charged and first subjected to a load equal to the load used in the testing procedure. A battery with an output indication between 90 and 110 is deemed to be acceptable. A lower reading indicates the battery is either undercharged or defective.
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Citations
15 Claims
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1. The method of determining the capability of a rechargeable battery to deliver its rated load comprising the steps of
providing a predetermined battery load, establishing a reference voltage representative of the terminal voltage of a good, fully-charged battery of the type being tested immediately upon being connected to a load equal to said predetermined load, for a predetermined time period cyclically connecting and disconnecting said predetermined load from said terminals to produce successive on-periods and off-periods, the frequency of said cyclical load being between 10 and 50 Hz, measuring an ending terminal voltage during an on-period at the end of said time period, and comparing said ending terminal voltage with said reference voltage as a measure of the capability of said battery to deliver its rated load.
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8. The method of determining the capability of a battery to deliver its rated load comprising in a single capability test the steps of
establishing a reference voltage from the known characteristics under an immediate load of a good and fully-charged battery of the type and voltage rating of the battery to be tested, providing a constant predetermined current cyclical load coupled to the terminals of the battery, for a predetermined time period cyclically connecting and disconnecting said load from said terminals to produce successive on-periods and off-periods, the on-periods and the off-periods each having a duration between 10 and 50 milliseconds, measuring an ending terminal voltage during an on-period at the end of said time period, and comparing said ending terminal voltage with said reference voltage as a measure of the capability of said battery to deliver its rated load.
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15. The method of determining the capability of a battery to deliver its rated load comprising the steps of
establishing a reference voltage from the known characteristics under an immediate load of a good and fully charged battery of the type and voltage rating of the battery to be tested. providing a constant predetermined current cyclical load coupled to the terminals of the battery, for a predetermined time period cyclically connecting and disconnecting said load from said terminals to produce successive on-periods and off-periods, the on-periods each having a duration between 10 and 50 milliseconds, maintaining the current through said load at a constant value during said time period, measuring an ending terminal voltage during an on-period at the end of said time period, and comparing said ending terminal voltage with said reference voltage as a measure of the capability of said battery to deliver its rated load.
Specification