Walker, WQ;
Cooper, K;
Hughes, P;
Doemling, I;
Akhnoukh, M;
Taylor, S;
Darst, J;
... Darcy, E; + view all
(2022)
The effect of cell geometry and trigger method on the risks associated with thermal runaway of lithium-ion batteries.
Journal of Power Sources
, 524
, Article 230645. 10.1016/j.jpowsour.2021.230645.
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Abstract
Consideration of thermal runaway heat output variability is paramount for the development of safe lithium-ion battery assemblies. This study utilizes data gathered from fractional thermal runaway calorimetry (FTRC) experiments to conduct a comparative analysis of thermal runaway heat output for three cell formats (18650, 21700, and 33600) as a function of trigger method (heaters, internal short-circuiting device, and nail penetration). The analysis is based on comparisons for the calculated total energy yield, fractional energy yield, heat rate, and heat flux. This study reveals that nail penetration tends to result in higher thermal runaway heat output for larger cells (21700 & 33600); these experiments also tended to result in higher fractions of the total energy being released through the cell body. The smaller cells (18650) did not appear to have significant variation in heat output as a function of trigger method. This finding suggests that, for this cell type, worst-case scenario heat output could be achievable in assembly level testing regardless of the utilized trigger method. This study also demonstrates successful translation of FTRC results, as recorded in the Battery Failure Databank, into meaningful analysis that breaks down the influence of specific conditions on thermal runaway heat output.
| Type: | Article |
|---|---|
| Title: | The effect of cell geometry and trigger method on the risks associated with thermal runaway of lithium-ion batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jpowsour.2021.230645 |
| Publisher version: | https://doi.org/10.1016/j.jpowsour.2021.230645 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Thermal runaway, Lithium-ion battery safety, Heat output characterization, Fractional thermal runaway calorimetry, Total energy release, Heat rate, Heat flux |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10144748 |
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