An equivalent circuit model for swelling in Prismatic Lithium-ion cells
| dc.contributor.author | Gingsjö, Erik | |
| dc.contributor.author | Harish , Poshith | |
| dc.contributor.department | Chalmers tekniska högskola / Institutionen för elektroteknik | sv |
| dc.contributor.examiner | Thiringer, Torbjörn | |
| dc.contributor.supervisor | Thiringer, Torbjörn | |
| dc.date.accessioned | 2024-04-03T17:14:00Z | |
| dc.date.available | 2024-04-03T17:14:00Z | |
| dc.date.issued | 2023 | |
| dc.date.submitted | ||
| dc.description.abstract | Abstract In this thesis, the expansion behavior of a Prismatic Lithium-ion cell is investigated via its external pressure changes. Experiments were done for 0% to 100% state-of-charge for both charge and discharge at various charging rates from 0.05C to 1.2C. An equivalent circuit with a single resistance was used to model the pressure behavior during charging, where the modeled resistance can be understood as a mechanical resistance of the cell casing to expand. It was shown to exhibit a clear trend for charging rate as well as state-of-charge, with values becoming bigger with both increasing charging rate and state-of-charge up to 0.5C. The model was evaluated for 0.3C with the absolute relative error between the modeled and experimental result being around 1% after 5% to 100% state-of-charge. Data from two research articles with similar pressure change experiments were used to validate the model. The first, [1], used charging rates comparable to those used in this thesis, and the other, [2], used charging rates above 1C. For the former, the modeled resistance values showed similar trends as presented here. For the latter however, the resistance values instead decreased with both state-of- charge and increasing charging rate, which was assumed to be due to lithium plating at higher state-of-charge at the higher charging rates as well as due to thermal effects. | |
| dc.identifier.coursecode | EENX30 | |
| dc.identifier.uri | http://hdl.handle.net/20.500.12380/307642 | |
| dc.language.iso | eng | |
| dc.setspec.uppsok | Technology | |
| dc.subject | Keywords: Li-ion cell, Cell swelling, Equivalent circuit model, Pressure response, Prismatic Li-ion cell | |
| dc.subject | Li-ion cell | |
| dc.subject | cell swelling | |
| dc.subject | Equivalent circuit model | |
| dc.subject | Pressure response | |
| dc.subject | Prismatic Li-ion cell | |
| dc.title | An equivalent circuit model for swelling in Prismatic Lithium-ion cells | |
| dc.type.degree | Examensarbete för masterexamen | sv |
| dc.type.degree | Master's Thesis | en |
| dc.type.uppsok | H | |
| local.programme | Electric power engineering (MPEPO), MSc |