A ‘Microscopic’ Structural Mechanics FE Model of a Lithium-Ion Pouch Cell for Quasi-Static Load Cases

Breitfuß, Christoph; Sinz, Wolfgang; Feist, Florian; Gstrein, Gregor; Lichtenegger, Bernhard; Knauder, Christoph; Ellersdorfer, Christian; Moser, Joerg; Steffan, Hermann; Stadler, Michael; Gollob, Peter; Hennige, Volker

doi:10.4271/2013-01-1519

Cited by 32 publications

(15 citation statements)

References 5 publications

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“…Breitfuss (2013) reported similar response of pouch cell components in dry and wet conditions under tensile tests. Breitfuss (2013) reported similar response of pouch cell components in dry and wet conditions under tensile tests.…”

Section: Introductionmentioning

confidence: 70%

“…They reported that the experiments were not reproducible and the FE model was not able to predict the forcedisplacement curve. 5 Kisters et al 30 performed hemispherical punch indentation tests on cells with and without electrolyte, in quasi-static and dynamic regimes and showed significant difference between dry and wet cell responses at high speeds. Therefore, the experiments in this study were performed on both dry and wet cells.…”

Section: Introductionmentioning

confidence: 99%

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Elliptical lithium‐ion batteries: Transverse and axial loadings under wet/dry conditions

Kermani

Dixon

Sahraei

2019

Energy Science & Engineering

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Use of lithium‐ion batteries in mobile applications requires understanding of their response in the case of an impact and mechanical damage. Several studies have investigated the properties of pouch and cylindrical cells. However, the mechanical response of the third common form factor of batteries, namely prismatic cells, has not been fully studied. In this paper, extensive experiments were used to investigate the material properties of small commercial prismatic cells with round corners, in transverse and axial directions. Also, the effects of liquid electrolyte on deformation and failure patterns of cells were studied. Results showed that in quasi‐static tests, the wet and dry cells exhibited similar response in terms of load displacement curves. However, the wet cells showed lower failure points and different fracture patterns. Additionally, the type of separator used in the cells affected the peak load. An analytical approach was proposed to extract material properties from full cell crush testing. Then, finite element models were developed and calibrated using the extracted parameters. The models successfully predicted the load‐displacement response of the cells and the onset of short circuit. Additionally, it was shown that consideration of anisotropic material response has a significant effect on proper prediction of axial loading behavior.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Elliptical lithium‐ion batteries: Transverse and axial loadings under wet/dry conditions

Kermani

Dixon

Sahraei

2019

Energy Science & Engineering

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“…The detailed, microscopic or physical method [9,10] tries to model every single electrode layer or the next bigger entity, the set of anode, separator and cathode as one FE component. In this way it is possible to actually model the wound layers as two-dimensional shell sheets.…”

Section: Fe Jelly Roll Materials Modelmentioning

confidence: 99%

“…The separator material used within the jelly roll is based on polypropylene foils. Therefore, direction dependency needs to be addressed as well [9]. These tests are performed on all components of interest.…”

Section: Mechanical Tests For the Jelly Roll Materials Modelmentioning

confidence: 99%

Safe crash integration of inherently unsafe battery technologies

Leitgeb

Thaler

2015

Elektrotech. Inftech.

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Current electrified vehicles (battery-electric BEV and plug-in hybrid vehicles PHEV) suffer from two partially dependent characteristics: high gross weight and limited pure electric driving range. The design possibilities for these vehicles are limited by crash safety requirements, among other factors. The safe battery housing and the current requirement of no-significant deformation on the battery severely restrict options for placement within the vehicle. Structural stiffening measures add additional weight to the already quite heavy battery system. To better utilize the available integration space, deformation and failure characteristics of traction batteries need to be better understood. Today's vehicle development process relies heavily on simulation tools, where finite-element (FE) methods are the established means for full-vehicle crash simulation. Therefore, to evaluate the structural performance capabilities and failure characteristics, the battery system must be adequately modeled and integrated with these methods. The development of new simulation tools that can be used in concert with the established ones are one priority of current research. The focus of this article is on integration aspects, especially in terms of failure prediction for the battery as a component. This article gives an overview on currently developed methods enabling the design of modern, structurally integrated battery concepts, while targeting crash safety demands and increased energy density for longer-range electric driving. Sichere Crashintegration von inherent unsicheren Batterietechnologien. Aktuell am Markt befindliche elektrifizierte Fahrzeuge leiden meist unter zwei von einander abhängigen Eigenschaften: hohes Fahrzeuggewicht und geringe rein elektrische Reichweite. Das liegt teilweise an den Anforderungen an dieCrashsicherheit für Lithiumionenbatterien, die heute unter anderem durch die Vermeidung jeglicher Verformung des Batteriesystems im Crashlastfall erfüllt werden. Dadurch wird allerdings der limitierte Platz im Fahrzeug weiter eingeschränkt sowie das Fahrzeug durch zusätzliche Versteifungsmaßnahmen schwerer. Um zukünftige Elektrofahrzeuge mit geringerer Masse und höherer Reichweite zu entwickeln, ist es notwendig, das Verformungspotential und die Versagenscharakteristik von Batterien besser zu verstehen. Eine der Methoden, die in der Entwicklung von Fahrzeugen erfolgreich eingesetzt wird, ist die Crashsimulation von Gesamtfahrzeugmodellen nach dem Prinzip der Finiten-Elemente-Methode. Das Batteriesystem muss in diesen Simulationsprozess integriert werden, um sowohl das strukturelle Verhalten als auch die Abschätzung von initialem Versagen zu ermöglichen. Neue Methoden und Prozesse, die dieselbe Genauigkeit und Vorhersagegüte wie aktuell verwendete aufweisen, werden zurzeit erforscht und entwickelt. Dieser Artikel gibt einen Einblick in derzeitige Forschungsthemen. Mithilfe dieser Methoden wird es möglich, crashsichere, gewichts-und reichweitenoptimierte Batteriekonzepte zu entwickeln.

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“…An FE model was developed for the cell and modified crushable foam material from LS Dyna library was adopted in order to account for its strain rate dependent behavior. Failure strains were calibrated by comparing load-displacement curves from [53]. Tensile tests were conducted on each cell component, in dry and wet conditions, and in axial and transverse directions.…”

Section: Pouched Cellsmentioning

confidence: 99%

Review: Characterization and Modeling of the Mechanical Properties of Lithium-Ion Batteries

Kermani

Sahraei

2017

Energies

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Li-ion batteries have become a dominant power source in consumer electronics and vehicular applications. The mobile use of batteries subjects them to various mechanical loads. The mechanisms that follow a mechanical deformation and lead to damage and failure in Li-ion batteries have only been studied in recent years. This paper is a comprehensive review of advancements in experimental and computational techniques for characterization of Li-ion batteries under mechanical abuse loading scenarios. A number of recent studies have used experimental methods to characterize deformation and failure of batteries and their components under various tensile and compressive loading conditions. Several authors have used the test data to propose material laws and develop finite element (FE) models. Then the models have been validated against tests at different levels from comparison of shapes to predicting failure and onset of short circuit. In the current review main aspects of each study have been discussed and their approach in mechanical testing, material characterization, FE modeling, and validation is analyzed. The main focus of this review is on mechanical properties at the level of a single battery.

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A ‘Microscopic’ Structural Mechanics FE Model of a Lithium-Ion Pouch Cell for Quasi-Static Load Cases

Cited by 32 publications

References 5 publications

Elliptical lithium‐ion batteries: Transverse and axial loadings under wet/dry conditions

Elliptical lithium‐ion batteries: Transverse and axial loadings under wet/dry conditions

Safe crash integration of inherently unsafe battery technologies

Review: Characterization and Modeling of the Mechanical Properties of Lithium-Ion Batteries

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