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- Title
Characterization of commercial 18,650 Li-ion batteries using strain gauges.
- Authors
Ren, Wenju; Zheng, Taixiong; Piao, Changhao; Benson, Daryn Eugene; Wang, Xin; Li, Haiqing; Lu, Shen
- Abstract
Most battery management systems make decisions based on voltage, current and temperature. Based on volume change, the resistance strain method is proposed and used to obtain more information about battery status. By comparing circumferential and axial strain, it is found that the strain mainly originates from the electrode volume change and SEI formation. The intercalation information of lithium-ion in graphite can be obtained by comparing the circumferential strain curve with the interpolation curve of graphite layer spacing, observed by X-ray diffraction. Rapid increase in circumferential strain is observed during charge when SOC > 92% owing to SEI formation. The difference in strain values along the axial direction is mainly caused by the polarization effects. The strain is buffered by the presence of flexible components, which delays strain inflection points and causes the discharge strain curve to show a monotonic decrease. The optimal location for strain measurement is also proposed. As a result of the rapid rise of strain at the end of charge, this method can be used to optimize the battery and battery management system design.
- Subjects
STRAIN gages; LITHIUM-ion batteries; BATTERY management systems; ELECTRIC batteries; X-ray diffraction; SYSTEMS design
- Publication
Journal of Materials Science, 2022, Vol 57, Issue 28, p13560
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-022-07490-4