By Haskins H., Battaglia V., Christophersen J.

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This reduces the number of test conditions required in the core matrix to just the essential calendar and cycling variations. The three identified supplemental test variations are (1) alternate sequences of combined calendar and cycle life conditions to verify the path-independence of the cell performance degradation, (2) application of cold-cranking tests as part of the periodic RPT regime, and (3) cycling at low temperature. Test setup requirements and procedures for these supplemental life tests are provided in the following sections.

Test facility measurement and data recording requirements are provided in Appendix E. It is assumed throughout that the test articles are individual battery cells sized to meet the performance ratings of at least one FreedomCAR battery system target application. The initial cell characterization tests fall into two categories: basic tests applied to all cells and additional tests applied only to selected cells. Basic tests, all conducted at the nominal reference temperature of 30ºC, include (a) capacity verification at a nominal C/1 discharge rate; and (b) pulse power verification using a minimum pulse power profile at only two states of charge.

The normal test duration of one week may be reduced for any cells that reach SOCMIN prior to the end of this test. A minimum of two cells is recommended for each test temperature. 2. The appropriate cold-cranking power profile will be applied at both the maximum and minimum SOCs. 2). 5 AC Electrochemical Impedance Spectrum (EIS) Testing An initial full-spectrum sweep of AC complex impedance (as defined in a cell-specific test plan) will be conducted only for the cells to be life tested in the supplemental life-test matrix.

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Battery Technology Life Verification Test Manual by Haskins H., Battaglia V., Christophersen J.

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