TY  - JOUR
PY  - 2022//
TI  - Thermal electrical tests for battery safety standardization
JO  - Energies (Basel, Switzerland)
A1  - Stein, Annika
A1  - Kehl, Daniel
A1  - Jackmann, Cedric
A1  - Essmann, Stefan
A1  - Lienesch, Frank
A1  - Kurrat, Michael
SP  - e7930
EP  - e7930
VL  - 15
IS  - 21
N2  - Battery safety tests are defined by several international standards in different ways and with heterogenous termination and failure criteria. In this work, lithium-ion cells were examined regarding their behavior in the event of overcharging and also in the event of an external short circuit with varied parameters specified by standards. The voltage, current, and temperature curves were evaluated. In addition, the changes in the cells were analyzed using electrochemical impedance spectroscopy (EIS). It is shown that the cells exhibit reproducible behavior in a clamped state. Further, it could be determined that the position of the cell opening during an overcharge has an influence on the further behavior of the cell. EIS data showed that the cells have a significantly higher internal resistance after an overcharge. The short-circuit tests at different ambient temperatures indicated that the internal resistance of the cell decreases with increasing temperature. However, no reproducible effects in impedance spectra were present after the short-circuit test. This work illustrates that the choice of test parameters and termination criteria undoubtedly influence the test results and thus may change the classification of cells as either safe or unsafe. Thus, cells may be classified as safe regarding a certain standard but unsafe regarding another.<p />  <p>Language: en</p>
LA  - en
SN  - 1996-1073
UR  - http://dx.doi.org/10.3390/en15217930
ID  - ref1
ER  -