Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
Ageing of lithium-ion batteries results in irreversible reduction in performance. Intrinsic variability between cells, caused by manufacturing differences, occurs throughout life and increases with age. Researchers need to know the minimum number of cells they should test to give an accurate represe...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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Wiley
2021
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| _version_ | 1797106703481700352 |
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| author | Dechent, P Greenbank, S Hildenbrand, F Jbabdi, S Sauer, DU Howey, DA |
| author_facet | Dechent, P Greenbank, S Hildenbrand, F Jbabdi, S Sauer, DU Howey, DA |
| author_sort | Dechent, P |
| collection | OXFORD |
| description | Ageing of lithium-ion batteries results in irreversible reduction in performance. Intrinsic variability between cells, caused by manufacturing differences, occurs throughout life and increases with age. Researchers need to know the minimum number of cells they should test to give an accurate representation of population variability, since testing many cells is expensive. In this paper, empirical capacity versus time ageing models were fitted to various degradation datasets for commercially available cells assuming the model parameters could be drawn from a larger population distribution. Using a hierarchical Bayesian approach, we estimated the number of cells required to be tested. Depending on the complexity, ageing models with 1, 2 or 3 parameters respectively required data from at least 9, 11 or 13 cells for a consistent fit. This implies researchers will need to test at least these numbers of cells at each test point in their experiment to capture manufacturing variability. |
| first_indexed | 2024-03-07T07:04:50Z |
| format | Journal article |
| id | oxford-uuid:7f99149c-003c-42b2-80c1-4fc5075aea4d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:04:50Z |
| publishDate | 2021 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:7f99149c-003c-42b2-80c1-4fc5075aea4d2022-04-29T10:58:04ZEstimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7f99149c-003c-42b2-80c1-4fc5075aea4dEnglishSymplectic ElementsWiley2021Dechent, PGreenbank, SHildenbrand, FJbabdi, SSauer, DUHowey, DAAgeing of lithium-ion batteries results in irreversible reduction in performance. Intrinsic variability between cells, caused by manufacturing differences, occurs throughout life and increases with age. Researchers need to know the minimum number of cells they should test to give an accurate representation of population variability, since testing many cells is expensive. In this paper, empirical capacity versus time ageing models were fitted to various degradation datasets for commercially available cells assuming the model parameters could be drawn from a larger population distribution. Using a hierarchical Bayesian approach, we estimated the number of cells required to be tested. Depending on the complexity, ageing models with 1, 2 or 3 parameters respectively required data from at least 9, 11 or 13 cells for a consistent fit. This implies researchers will need to test at least these numbers of cells at each test point in their experiment to capture manufacturing variability. |
| spellingShingle | Dechent, P Greenbank, S Hildenbrand, F Jbabdi, S Sauer, DU Howey, DA Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability |
| title | Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
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| title_full | Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
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| title_fullStr | Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
|
| title_full_unstemmed | Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
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| title_short | Estimation of Li-Ion degradation test sample sizes required to understand cell-to-cell variability
|
| title_sort | estimation of li ion degradation test sample sizes required to understand cell to cell variability |
| work_keys_str_mv | AT dechentp estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability AT greenbanks estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability AT hildenbrandf estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability AT jbabdis estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability AT sauerdu estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability AT howeyda estimationofliiondegradationtestsamplesizesrequiredtounderstandcelltocellvariability |