Deformation and failure mechanisms of 18650 battery cells under axial compression An important deformation mode during ground impacts of battery packs made of cylindrical battery cells is axial compression. This type of loading subjects the cell to a complex deformation pattern and failure mechanism.
An important deformation mode during ground impacts of battery packs made of cylindrical battery cells is axial compression. This type of loading subjects the cell to a complex deformation pattern and failure mechanism. The design of endcaps plays an important role in such deformations.
Fracture behaviors of cell shells during thermal runaway are investigated. Experimental characterization validates the physics-based modeling. The shell deformation depends on the inner pressure and temperature distribution. The CFRP sleeve is an effective way to mitigate shell sidewall fractures. 1. Introduction
1. Introduction Cylindrical lithium ion battery cells have been a major power source for Electric Vehicles like Tesla Model S. The vertical configuration of these cells in the floor mounted battery packs make them prone to axial deformation in case of a ground impact.
Deformation and fracture of battery under different temperature distributions According to the experimental observations, there are various fracture behaviors (such as shapes and positions of the facture) of the cell shell during TR which can be classified into two types, i.e., end (or cap) rupture and side rupture.
The deformation ε consists of two parts: the deformation ε p produced by internal pressure and the deformation ε t introduced by the thermal expansion effect. The simulation results show that the stress concentration first occurs in the bottom edge of the battery (Fig. 7 a and c).