scholarly journals Methodology for Developing a Macro Finite Element Model of Lithium-Ion Pouch Cells for Predicting Mechanical Behaviour under Multiple Loading Conditions

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1921
Author(s):  
Richard Beaumont ◽  
Iain Masters ◽  
Abhishek Das ◽  
Steve Lucas ◽  
Arunn Thanikachalam ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Cell Structure ◽  
Lithium Ion ◽  
Element Model ◽  
Confined Compression ◽  
Computationally Efficient ◽  
Internal Cell ◽  
Bending Load ◽  
Modelling Methodology

To assist in light weighting of electric vehicles by improving the volumetric and gravimetric energy density and the structural performance of the battery pack, a modelling methodology based on a macro finite element model of a pouch cell has been developed. This model treats the core cell structure as a homogeneous orthotropic honeycomb block with the pouch material being defined as an orthotropic fabric with compressive stress elimination. The model considers five compression and bending load cases simultaneously and allows a level of element discretisation that is computationally efficient and appropriate for inclusion in full vehicle and sub-system simulations. The methodology is scalable in that it can be applied to a range of chemistries, external geometries and internal cell constructions. When considering stacks of cells, the model is predictive for both lateral compression and three-point bend, but further work is required to improve the confined compression response.

scholarly journals Modeling and Experimental Verification of Heat Dissipation Model for Test System of Li-ion Battery Test-bench

2021 ◽  
Vol 2066 (1) ◽  
pp. 012088
Author(s):  
Jie Qu ◽  
Meihua Huang ◽  
Chao Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Lithium Ion Battery ◽  
Heat Dissipation ◽  
Test Bench ◽  
Lithium Ion ◽  
Element Model ◽  
Test System ◽  
Optimal Test ◽  
The Finite Element Model

Abstract In order to develop a test-bench which can accurately test the mechanical signal of lithium-ion battery under various working conditions, the finite element model of heat dissipation simulation is established for different test systems designed in the mechanical system of the test-bench. At the same time, pulse excitation experiments are used to verify the simulation results, and the bulk force experiments are carried out to verify the optimal test system structure chosen accord to the simulation results. The mechanical structure of a test system is composed of a lithium-ion battery and upper/lower spacer. In its finite element model, the finite element model of the lithium-ion battery is established by the actual measurement after cutting lithium-ion battery by a diamond cutter, and spacers are established according to their actual design. The heat dissipation simulation finite element model can simulate the heat dissipation of an actual test system, which is conducive to the design and selection of an optimal test system, so as to improve the accuracy of test data measured through the test-bench and provide a reliable data basis for the development of the battery management system coupling temperature-current-voltage-swell-force.

scholarly journals Shape Influence of Active Material Micro-Structure on Diffusion and Contact Stress in Lithium-Ion Batteries

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 134
Author(s):  
Davide Clerici ◽  
Francesco Mocera ◽  
Aurelio Somà
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Contact Stress ◽  
Particle Shape ◽  
Active Material ◽  
Lithium Ion ◽  
Element Model ◽  
Contact Areas ◽  
Diffusion Stress ◽  
Contact Domain

Electrochemical-mechanical modelling is a key issue to estimate the damage of active material, as direct measurements cannot be performed due to the particles nanoscale. The aim of this paper is to overcome the common assumptions of spherical and standalone particle, proposing a general approach that considers a parametrized particle shape and studying its influence on the mechanical stresses which arise in active material particles during battery operation. The shape considered is a set of ellipsoids with variable aspect ratio (elongation), which aims to approximate real active material particles. Active material particle is divided in two domains: non-contact domain and contact domain, whether contact with neighbouring particles affects stress distribution or not. Non-contact areas are affected by diffusion stress, caused by lithium concentration gradient inside particles. Contact areas are affected simultaneously by diffusion stress and contact stress, caused by contact with neighbouring particles as a result of particle expansion due to lithium insertion. A finite element model is developed in Ansys™APDL to perform the multi-physics computation in non-spherical domain. The finite element model is validated in the spherical case by analytical models of diffusion and contact available for simple geometry. Then, the shape factor is derived to describe how particle shape affects mechanical stress in non-contact and contact domains.

scholarly journals Finite element analysis of flexural behavior of textile reinforced concrete slab

2021 ◽  
Vol 261 ◽  
pp. 02042
Author(s):  
Mingqiu Xu ◽  
Jianhua Shao ◽  
Baijian Tang ◽  
Hongming Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Concrete Slab ◽  
Element Model ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Bending Load

Order to investigate the failure effect of textile reinforced concrete (TRC) plate under bending load, the corresponding finite element model is established. By comparing the numerical simulation results with the experimental results, the rationality and feasibility of the finite element model are verified, and then the crack extension of TRC and the ultimate strain of carbon textile are analyzed. The failure mode of the slab under bending load is obtained, and it is found that the carbon textile concrete slab has better reinforcement effect, which greatly improves the safety performance of concrete members.

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