Application independent map-based cycle life testing of battery cells
AssigneeSouthwest Research Institute
InventorsBapiraju Surampudi, Joe Steiber, Jeff Qiang Xu
Life of this patent
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Abstract
A method and system for application independent map-based cycle life testing of battery cells is provided. A target depth of discharge (DOD) and a charge/discharge current level is selected for the battery test. The battery is discharged to the target DOD. The battery is cycled within the DOD range one or more times, wherein the cycling comprises a charge pulse and a discharge pulse at the selected current levels. A reference performance test (RPT) is performed on the battery, wherein the RPT comprises a static capacity test and a dynamic power test. The cycling and RPT testing are repeated until an end of test condition is detected.
Claims17
A method for cycle life testing of a battery, said method comprising:
- selecting a target depth of discharge (DOD) for said battery test;
- selecting a DOD range that includes a DOD range minimum value that is less than the target depth of discharge and a DOD range maximum value that is greater than the target depth of discharge for said battery test;
- selecting a charge current (Ic) and a discharge current (Id) for said battery test;
- discharging said battery to said target DOD;
- cycling said battery within said DOD range one or more times, wherein said cycling comprises a charge pulse at Ic and a discharge pulse Id;
- performing a reference performance test (RPT) on said battery, wherein said RPT comprises a static capacity test and a dynamic power test;
- determining if an end of test condition has occurred;
- repeating said cycling and said RPT testing until said end of test condition occurs;
- and
- wherein said test is performed at a first power level, a second power level and a third power level, wherein said first power level is 39% to 41% of a rated power of said battery, said second power level is 24% to 26% of said rated power and said third power level is 9% to 11% of said rated power.
An article comprising a non-transitory storage medium having stored thereon instructions that when executed by a machine result in the following operations:
- selecting a target depth of discharge (DOD) for said battery test;
- selecting a DOD range that includes a DOD range minimum value that is less than the target depth of discharge and a DOD range maximum value that is greater than the target depth of discharge for said battery test;
- selecting a charge current (Ic) and a discharge current (Id) for said battery test;
- discharging said battery to said target DOD;
- cycling said battery within said DOD range one or more times, wherein said cycling comprises a charge pulse at L and a discharge pulse Id;
- performing a reference performance test (RPT) on said battery, wherein said RPT comprises a static capacity test and a dynamic power test;
- determining if an end of test condition has occurred;
- repeating said cycling and said RPT testing until said end of test condition occurs;
- and
- wherein said test is performed at a first power level, a second power level and a third power level, wherein said first power level is 39% to 41% of a rated power of said battery, said second power level is 24% to 26% of said rated power and said third power level is 9% to 11% of said rated power.
Dependencies are inferred from the claim text.