scholarly journals Thermal Abuse Behavior of the LIR2450 Micro Coin Cell Battery Having Capacity of 120 mAh with Internal Short Circuit by Penetrating Element

Symmetry ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 246
Author(s):  
Moo-Yeon Lee ◽  
Namwon Kim ◽  
Jae-Hyeong Seo ◽  
Mahesh Suresh Patil
Keyword(s):  
Heat Generation ◽  
Short Circuit ◽  
Lithium Ion ◽  
State Of Charge ◽  
Generation Rate ◽  
Heat Generation Rate ◽  
Coin Cell ◽  
Element Size ◽  
Internal Short Circuit ◽  
Circuit Resistance

Internal short circuit in lithium-ion battery by penetrating element leads to exothermic behavior due to accumulated heat. In the present study, investigations are conducted on the thermal behavior of the LIR2450 micro coin cell haivng capacity of 120 mAh, with internal short circuit by penetrating element. The experimental coin cell discharge study was conducted and validated with numerical study within ±5.0%. The effect of penetrating element size, location of penetrating element, state of charge, discharge rate, short-circuit resistance, and heat transfer co-efficient on maximum coin cell temperature and heat generation rate are analyzed. The penetrating element diameters of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 mm are considered. The effect of initial state of charge (SOC) is considered with 100%, 80%, 60%, and 40%. Three locations for penetrating element are considered with the center, the middle of the radius, and on the edge of the coin cell radius. The different discharge rates of 1C, 2C, 3C, and 4C are considered. The higher-penetrating element size of 3.5 mm with location at the center of the coin cell with 100% SOC showed maximum heat generation rate and maximum temperature of the coin cell. In addition, the optimum value of the dimensionless heat generation rate is obtained at dimensionless short-circuit resistance. The study provides comprehensive insights on the thermal behavior of the lithium-ion cell during thermal abuse condition with internal short circuit by penetrating element.

scholarly journals Effects of State-of-Charge and Penetration Location on Variations in Temperature and Terminal Voltage of a Lithium-Ion Battery Cell during Penetration Tests

Batteries ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 81
Author(s):  
Yiqun Liu ◽  
Yitian Li ◽  
Y. Gene Liao ◽  
Ming-Chia Lai
Keyword(s):  
Experimental Data ◽  
Short Circuit ◽  
Lithium Ion ◽  
State Of Charge ◽  
Initial State ◽  
Battery Cell ◽  
Temperature Increment ◽  
Terminal Voltage ◽  
Internal Short Circuit ◽  
Penetration Tests

The nail penetration test has been widely adopted as a battery safety test 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 penetration tests are investigated. Three different initial SOCs (10%, 50%, and 90%) and three different penetration locations (one is at the center of the cell, the other two are close to the edge of the cell) are used in the tests. Once the steel cone starts to penetrate the cell, the cell terminal voltage starts to drop due to the internal short-circuit. The penetration tests with higher initial cell SOCs have larger cell surface temperature increases during the tests. Also, the penetration location always has the highest temperature increment during all penetration tests, which means the heat source is always at the penetration location. The absolute temperature increment at the penetration location is always higher when the penetration is close to the edge of the cell, compared to when the penetration is at the center of the cell. The heat generated at the edges of the cell is more difficult to dissipate. Additionally, a battery cell internal short-circuit model with different penetration locations is built in ANSYS Fluent, based on the specifications and experimental data of the tested battery cells. The model is validated with an acceptable discrepancy range by using the experimental data. Simulated data shows that the temperature gradually reduces from penetration locations to their surroundings. The gradients of the temperature distributions are much larger closer to the penetration locations. Overall, this paper provides detailed information on the temperature and terminal voltage variations of a lithium-ion polymer battery cell with large capacity and high power under penetration tests. The presented information can be used for assessing the safety of the onboard battery pack of electric vehicles.

Modeling Heat Generation in a Lithium Ion Battery

2011 ◽  
Author(s):  
Wei Wu ◽  
Xinran Xiao ◽  
Xiaosong Huang
Keyword(s):  
Heat Generation ◽  
Numerical Study ◽  
Lithium Ion ◽  
Local Heat ◽  
Generation Rate ◽  
Generation Model ◽  
Heat Generation Rate ◽  
Battery Cell ◽  
Discharge Rates ◽  
Generation Mechanisms

This paper presents a numerical study on heat generation in a lithium-ion (LiC6/LiPF6/LiyMn2O4) battery cell. The numerical model considered multi-physics including battery kinetics, diffusion, and thermal analysis. The heat generation rate was determined by a local heat generation model. This model enables the investigation of the effects of battery parameters on different heat generation mechanisms and the overall heat generation rate in the battery. The effects of the thickness of the battery components and the size of the electrode particles at different discharge rates were evaluated. The results revealed the relationships between these parameters. A battery with a low heat generation rate and efficient battery utilization may be achieved through parameter optimization.

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