Special section ‘Energy storage and electric power sub-systems for advanced vehicles’: Nowadays automotive battery systems consist of a vast number of lithium (Li)-ion cells in a serial connection. Next to the operation strategy especially disparities in the performance parameters of the cells at their initial states and during lifetime have therefore a huge influence on the overall system performance and its lifetime. Opposing that fact the disparity of cells due to production process and different boundary conditions is mostly neglected in system design. The cells are rather considered as even according to parameterisation measurements carried out and lifetime experiments of only a few cells per test condition. This study will show that the diversification of the cells has to be taken into account during system layout and packaging in order to optimise the lifetime and performance on system level. Moreover, the impact of the operation strategy on ageing is analysed more in detail and guidelines are given. In these analyses, the study is based on elaborate laboratory experiments with a high number of Li-ion automotive cells.

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Disparity in initial and lifetime parameters of lithium-ion cells

References

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