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Mechanical properties of lithium battery modules with different packing angles under quasi-static conditions(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年5期
Page:
107-118
Research Field:
汽车与机械工程
Publishing date:

Info

Title:
Mechanical properties of lithium battery modules with different packing angles under quasi-static conditions
Author(s):
ZHAO Wei1;  YAO Yu-xuan1; 2;  CHEN Xiao-ping2;  CHEN Hao1
(1. School of Energy and Electrical Engineering, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315336, Zhejiang, China)
Keywords:
automotive engineering;  lithium-ion battery;  finite element simulation;  battery packing;  power engineering;  quasi-static condition;  packing angle
PACS:
U469.72
DOI:
10.19721/j.cnki.1671-8879.2023.05.011
Abstract:
In order to research the mechanical safety of lithium-ion battery modules with different packing angles under quasi-static conditions, the mechanical properties and failure behavior of lithium battery modules were investigated by test and simulation.Firstly, the quasi-static radial compression experiment was carried out on the single 18650 lithium-ion battery. The finite element model of the single 18650 lithium-ion battery was established by using ABAQUS software, and the short circuit judgment basis for subsequent research was obtained, according to the maximum equivalent plastic stress rule. Then, in order to verify the feasibility of the finite element model for the simulation of battery modules, the finite element model of battery modules with a small number of batteries and packing angle of 180° and 120° were established under quasi-static load. The SUNS universal testing equipment, KEYSIGHT voltage measuring equipment and SONYFDR-AX4 HD camera were also used to build an experimental system,and the quasi-static radial compression experiment was carried out. Finally, the simulation of quasi-static radial compression of lithium-ion battery modules with a packing width and layers of 6×6, and packing angles of 180°, 120°, 90° and 60° were established, and the resulting load-displacement curves, Von-Mises stress nephogram and equivalent plastic strain nephogram were analyzed to study the mechanical characteristics of the battery modules. The results show that the greater the packing density of the battery module, the greater load it can withstand before short circuit. When the packing angle is 60°, the battery module density is the largest, the maximum load before short circuit is 602.4 kN, and the ratio of compression displacement to total length is 41.43%. By observing equivalent plastic strain nephogram and Von-Mises stress nephogram, it is found that the equivalent plastic strain and stress of the battery module with packing angle of 60° are the most uniform, the variable of the battery shapeis smaller in the longitudinal direction, and the short circuit is least likely to occur.2 tabs, 21 figs, 23 refs.

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Last Update: 2023-10-10