Research on the behaviour of a LiFePo₄ pouch cell under mechanical stress

Abstract

In this article, research has been done regarding the behaviour of the pouch cell under the action of mechanical abuse, in order to improve pouch battery cells design. Four types of indentations were performed on pouch cell respectively, three-point bending, lateral bending, indentation with hemispherical head and pinch indentation. Contemporary electric vehicles are a solution in terms of environmental pollution, that is why the large vehicle manufacturers also have different models of electric vehicles. Also, a major problem for electric vehicles customers is the autonomy of a vehicle. That forces major electric vehicle manufacturers to invest in in-depth research into storing electricity in energy cells. Li-ion cells seem to be a viable solution at present, and that is why the paper presented a pouch-type cell subjected to specific mechanical stresses. Also, the internal short circuit can be observed in all four tests performed, and its effects are destructive in the case of lithium-ion pouch cells.

Comparative study of Li-ion 18650 cylindrical cell under pinch indentation

“…Other researchers have extensive studies regarding the short circuit phenomena of the batteries [4,5]. Conclusions were mentioned also in the papers, the simulation were validated, load versus deformation results overlapped on the graph.…”

Experimental and Numerical Study on Mechanical Deformation Characteristics of Lithium Iron Phosphate Pouch Battery Modules under Overcharge Conditions

“…At present, there are many related investigations on the safety of battery abuse. − Most abuse is accompanied by battery deformation, such as battery deformation under a mechanical load. − Li et al proposed a plasticity model to characterize the large deformation of the battery cell under external loads. There is also the thermal swelling of the battery caused by an increase in temperature. − Oh et al proposed a three-dimensional (3-D) finite numerical model to investigate the impact of temperature variations on the thermal behaviors of battery cells.…”