Measuring Cylindrical Cell‘s expansion by Stereo Camera Based Methods
The increasing use of Lithium-ion batteries in many aspects of human life is accompanied by a growing need for continuous battery supervision and recognition of safety-critical states of operation. Mechanical alterations inside the cell, e.g., caused by lithium plating, are possibly indicative of such states and are thus desirable to recognize. Furthermore, as most mechanical […]
Electrolyte degradation – Additives and their impacts on cell performance
NMC622/Graphite-Pouch-Cells with a capacity of 5 Ah and different electrolytes are investigated under cyclic and calendaric ageing. In addition the analysis of gasses formed during formation, reveals different formation reactions for the different additives. While additve-free electrolyte mainly produces ethylene during formation, the main contribution shifts to carbonmonoxide when additives are used. Carbondioxide is only […]
Experimental analysis of the aging behavior of battery packs with forced air cooling and immersed cooling system
The choice of a proper cooling system and its correct sizing is a key factor when designing a battery pack for a certain application. This influence performance, costs, safety, and lifetime of the battery pack and therefore of the full system. Among all possible methods, the so-called active immersed cooling has not yet been thoroughly […]
Safe-Handling of e-vehicles after accidents: Recommendations for the rescue chain
Through literature research and expert interviews, the current tactical standard of the fire brigades in dealing with crashed electric vehicles was determined. In addition, a survey of firefighters on existing skills and experience in this field was conducted. The identification of the drive system of an accident vehicle can be assessed as uncritical. Reliable tools […]
Achieving Quantitatively Accurate Li-S Models Through Rigorous Validation
This poster represents a paper we recently submitted. The purpose of work is to introduce both a novel zero-dimensional model for Lithium Sulfur cells as well as an empirical model validation technique. Part of the motivation for looking at model validation procedures is that we have come across several shortcomings in the literature. For example, […]
Achieving Quantitatively Accurate Li-S Models Through Rigorous Validation
This poster represents a paper we recently submitted. The purpose of work is to introduce both a novel zero-dimensional model for Lithium Sulfur cells as well as an empirical model validation technique. Part of the motivation for looking at model validation procedures is that we have come across several shortcomings in the literature. For example, […]
Impact of the tabless electrode design on future cylindrical lithium-ion battery packs
Cylindrical lithium ion cell with a tabless electrode experience less current and temperature inhomogenities during cycling compared to cells with a single tab. The enhanced thermal connection between jellyroll and cell can enables effective cooling from the cell top and bottom. As temperature gradients spread in axial direction, the diameter has only minor influence on […]
Development of Si-anode based lithium-ion battery for integration in photovoltaic charging battery system
Solar photovoltaic (PV) energy generation depends greatly on weather conditions, leading to a gap between demand and supply [1]. Therefore, combining photovoltaics energy generation and batteries energy storage is of high interest which can reduce the usage of fossil fuels 2. Batteries to be integrated with a PV module in a PV-Battery system need to […]
Non-contacting chromatic confocal distance measurements of pouch cells during cycling
Lithium-ion cells gain increasingly interest in e-mobility applications. During charging and discharging, these batteries experience reversible thickness changes and inhomogeneous temperature distribution causing a space-dependent aging. Additionally, irreversible expansion and temperature driven defects occur during operation, such as gassing, particle cracking and SEI growth. These aging effects occur inhomogeneously. As a result, the useful life […]
A faster novel experimental procedure for parameterisation of equivalent circuit models for lithium-ion batteries
The battery industry is growing at an exceptional rate driven by the growing electric vehicle industry. Range and power demands from consumers are forcing the industry to develop more capable batteries. Therefore, along with new chemistries being developed, existing chemistries are continually tweaked to meet a need. These, often small changes in chemistry, can result […]