Batteries, Vol. seven, Pages 81: Effects of State-of-Charge and Penetration Place on Variations in Heat range and Terminal Voltage of a Lithium-Ion Battery Cell during Penetration Tests
Batteries doi: 10. 3390/batteries7040081
Authors: Yiqun Liu Yitian Li Y. Gene Liao Ming-Chia Lai
The toenail penetration test has already been widely adopted as a battery safety test intended for reproducing internal short-circuits. In this paper, the effects of cell initial State-of-Charge (SOC) and penetration location on variations in cell temperature and terminal voltage during transmission tests are investigated. 3 different initial SOCs (10%, 50%, and 90%) plus three different penetration areas (one is at the center of the cell, the various other two are close to the edge of the cell) are used in the particular tests. Once the metal cone starts to penetrate the particular cell, the cell port voltage starts to drop because of to the internal short-circuit. The penetration tests along with higher initial cell SOCs have larger cell surface area temperature increases during the tests. Also, the transmission location always has the highest temperature increment throughout all penetration tests, which usually means the heat source is always at the transmission location. The absolute temperature increment at the penetration place is always higher once the penetration is close to the edge of the cell, compared to once the penetration is at the center of the cellular. The heat generated at the edges of the cellular much more difficult to dissipate. Additionally, a battery cell internal short-circuit model with different penetration locations is normally built in ANSYS Progressive, based on the specs and experimental data associated with the tested battery cellular material. The model is validated with an acceptable difference range by using the particular experimental data. Simulated information shows that the temp gradually reduces from penetration locations to their surroundings. The gradients of the particular temperature distributions are a lot larger nearer to the penetration locations. Overall, this papers provides detailed information on the temperature and airport terminal voltage variations of the lithium-ion polymer battery cell along with large capacity and large power under penetration lab tests. The presented information may be used for assessing the safety of the particular onboard battery power of electric vehicles.