By Haskins H., Battaglia V., Christophersen J.
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Extra resources for Battery Technology Life Verification Test Manual
Both groups will be subjected to a coldcranking test at each specified RPT interval throughout the duration of the overall test program. The requirements and procedures for the calendar life, cycle life, and cold-cranking tests are as previously specified above. 2 as appropriate) just after the completion of the normal MPPC test at the reference temperature, as follows: After completion of the MPPC profile at SOCMIN, a. Recharge the cell to SOCMAX, including taper charge to the specified cutoff taper current.
This test should be conducted on a minimum of two cells at each temperature. 2 Pulse Power Verification The HPPC procedure of Reference 8 (for power assist applications) will be used to verify the cells’ pulse power capabilities over the full range of SOC. In addition to the normally specified values of SOC used in this test, the HPPC profile should also be applied at the minimum and maximum specified SOCs. ) To enable comparison of these results with those obtained using the MPPC, a minimum of eight cells should be tested at each temperature to be used for life testing.
A taper current is used to complete the discharge to the corresponding specified minimum OCV. 4. The cell is allowed to rest at open-circuit for one hour. 5. The specified MPPC profile is applied. 3 Additional Characterization of Selected Cells Additional characterization tests will be conducted on a limited number of cells to meet the following objectives: (1) mapping of OCV versus SOC to determine the OCVs that correspond to the specified minimum and maximum SOCs, (2) verification of pulse power capabilities over the full range of cell SOC using the HPPC procedure, (3) verification of self-discharge rates, (4) verification of cold-cranking power capabilities, and (5) initial measurement of AC electrochemical impedance spectra (EIS) for comparison with end-of-test spectra.