Coupled electrochemical-thermal analysis of the novel TESLA-type large format 4680 cylindrical lithium-ion battery under normal and extreme conditions

被引:0
作者
Eze, Chika [1 ]
Zhao, Jingyuan [2 ]
Liu, Huaqiang [3 ]
Shi, Yu [4 ]
Chung, Dukhyun [5 ]
Zhao, Jiyun [6 ]
Chen, Guanhua [7 ,8 ]
Chuang, Abel [1 ]
机构
[1] Univ Calif Merced, Dept Mech Engn, Merced, CA 95340 USA
[2] Univ Calif Davis, Inst Transportat Studies, Davis, CA USA
[3] Dalian Maritime Univ, Naval Architecture & Ocean Engn Coll, Dalian, Peoples R China
[4] Shanghai Univ, Sch Mechatron Engn & Automat, Shanghai, Peoples R China
[5] Chungnam Natl Univ, Dept Mech Engn, Daejeon, South Korea
[6] City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
[7] Hong Kong Quantum AI Lab, 17 Sci Pk West Ave, Hong Kong, Peoples R China
[8] Univ Hong Kong, Dept Chem, Hong Kong, Peoples R China
关键词
Li-ion battery; Electrochemical performance; Thermal performance; Tabless cell designs; LIFEPO4; BATTERY; POLYMER BATTERY; MODEL; MANAGEMENT; PERFORMANCE; DISCHARGE; BEHAVIOR; VALIDATION; FAILURE; DESIGN;
D O I
10.1016/j.jpowsour.2025.237164
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The novel TESLA's large format (LF) 4680 tabless cylindrical lithium-ion battery (LIB) represents a significant advancement in battery technology, promising higher energy density, faster charging capabilities, and reduced costs compared to the traditional LIBs used in current electric vehicles (EVs). Despite the above advantages, tabless 4680 cell is particularly vulnerable to thermal safety hazards due to its higher energy storage capacity poor heat dissipation performance resulting from a reduced surface-to-volume ratio. To address this concern, develop an unrolled 3D electrochemical (EC) model coupled with a 2D axisymmetric heat transfer (HT) model a tabbed 21700 cylindrical LIB, and utilize this to create the corresponding Tabless designs by modifying 21700 tabs into continuous layouts, and scaling up and down to the tabless 4680 and 18650 cells respectively, enabling a comparative analysis of the coupled EC-HT performances of the three cell types under normal extreme conditions. At a standard ambient temperature of 25 degrees C, the voltage curves and total volumetric heat profiles of all three cell types align across discharge currents ranging from 0.1C to 4C rates. This alignment attributed to the cell's tabless design, which reduces internal resistance and enhances current distribution. contrast, their corresponding temperature profiles differ significantly, which demonstrates that although all cells generated total heats at the same volumetric rate, the 4680-cell reached highest maximum temperature (MT) temperature differentials (TD) due to its lower heat dissipation capacity relative to the other cell types. subzero ambient temperature (-25 degrees C), the voltage drops below terminal voltage at 1C-rate for 18650, 21700 and 4680 cells occur at depth of discharge (DoD) of 56 %, 58 %, and 72 %, respectively, which suggests lower capacity degradation of 4680 cells, attributed to reduced Li-ion ohmic, and concentration overpotentials. At a high discharge rate of 4C, all cells exhibit similar capacity degradation with a sharp voltage drop below the terminal voltage at the early stage of discharge process (DoD = 6.4 %). Finally, various battery thermal management systems (BTMS) designs for LF 4680 cell were explored for a discharge protocol of 4C. And we find that increasing coolant's heat transfer coefficient (HTC) only helps to reduce overheating while worsening temperature non-homogeneity. On the other hand, increasing radial thermal conductivity (kradial) may help to lower both overheating and temperature non-homogeneity. While the optimal cooling architecture is a combined "top and bottom" cooling approach. This study provides new insights into the EC-HT performance evaluation and BTMS designs of the LF 4680 cell for current and next-generation EVs.
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页数:27
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