Abstract
A multi-parameter controlled pinch test was developed to study the occurrence of internal short circuits in Li-ion and Li-ion-polymer cells. By tuning the control parameters (i.e., cell voltage as well as pinching area, load, and speed), the pinch test can reproducibly create an internal short between a cell jelly-roll's inner layer electrodes as small as 1-mm wide. This recreates conditions similar to those that may occur during service. In this paper we demonstrate the use of the pinch test as a means to assess design and manufacturing changes in Li-ion-polymer cells on their thermal stability and to identify features or characteristics that lower risk of potential thermal events created by internal short circuits.
| Original language | English |
|---|---|
| Pages (from-to) | 7779-7783 |
| Number of pages | 5 |
| Journal | Journal of Power Sources |
| Volume | 196 |
| Issue number | 18 |
| DOIs | |
| State | Published - Sep 15 2011 |
Funding
The authors would like to thank Russ Gyenes (Motorola Mobility) for technical advice, Donald Erdman, Christopher Stevens and Yanli Wang (ORNL) for their help on the pinch tests. This work was sponsored by the Laboratory Directed Research and Development (LDRD) program of ORNL managed by the UT-Battelle LLC, for the Department of Energy under contract DE-AC05000OR22725 and Oak Ridge Associated University through ORISE's postdoctoral research program.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DE-AC05000OR22725 |
| Oak Ridge Associated Universities | |
| Oak Ridge National Laboratory | |
| Laboratory Directed Research and Development | |
| UT-Battelle |
Keywords
- Internal short circuit
- Li-ion cells
- Li-ion-polymer cells
- Thermal stability
