Automotive and mobile applications
Lectures
The Future of Automotive Li-Ion Battery Production in Europe
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On the influence of tab-design in large format lithium-ion pouch cells on cell performance and plating behavior
Lithium-ion batteries are the technology of choice for electrochemical energy storage systems, particularly in electromobility. One important research aspect is the tab design and its influence on the cell behavior. Using a model that has been previously verified by Erhard et. al. to accurately simulate the spatial potential distribution across
Novel barriers for preventing thermal propagation – From research to market
The overall increasing application of lithium-ion batteries, driven by the field of electric vehicles and stationary storage systems forcing a permanently increase of energy and power density. Hence, new cell chemistries with thermally sensitive materials are developed by battery industry to meet the customers’ requirements in driving range. Therefore, thermal
First and second degassing of automotive Lithium-Ion batteries at overtemperature experiments
In normal usage operation, lithium-ion batteries (LIB) do not exchange hazardous gases with the environment. But, if there is a defect within the cell, leakage of the LIB with vaporizing electrolyte and serious potential risks1,2,3 are possible. During internal or external battery failures, the pressure inside the battery cell increases
Fast-charging in practice – a way to get it done!
The ability to fast-charge Lithium-Ion batteries is a key requirement for the success of electric vehicles. One main problem when fast-charging Lithium-Ion batteries is Lithium-plating. There, the Lithium-Ions are not intercalated into the anode but are deposited on its surface. This leads not only to safety issues, but also reduces
Posters
Toolchain for advanced modeling of rechargeable lithium-ion batteries
Battery electrical and thermal modeling is a fundamental task in understanding cell and system performance and degradation during the development of battery system for application. This is generally accomplished by i) cell and system test analysis and evaluation, ii) model selection, iii) parameterization, and iv) validation. In the frame of
State of Health Estimation of Lithium-Ion Batteries under Real-World Operational Conditions
Due to the transition to electric mobility the interest for the battery as core component of every battery electric vehicle (BEV) and its State of Health (SOH) rises. Multiple supervised machine learning methods have been applied to the regression task of SOH estimation of lithium-ion batteries from the charging curve
PCCM for Peak Thermal Load Shaving of LIB During 6C Fast Charge
Lithium-Ion Secondary Batteries (LIB) have a narrow operational window in terms of cell temperature. The optimum working temperature is between 15 and 45°C. Thus, modern battery systems for electric vehicles have complex active thermal management systems allowing for heating and cooling to operate the LIB in its desired temperature range.
Parametrization & time-domain transformation of discrete transmission line models for graphite electrodes
Transmission line model (TLM) or mixed conducting networks are used frequently for the characterization of porous electrodes based on the electrodes’ impedance data, showing the influence of the porous morphology and of spatially distributed behavior in the frequency domain. For this purpose, transfer functions are used to characterize the TLM,
Measurement of the Frequency Dependent Acoustical Transmission for the Characterisation of Mechanical Changes in Lithium-Ion Cells
The poster describes the performed steps in order to develop a reproducible ultrasonic-based diagnosis method for lithium-ion cells. In order to assess how useful this method can be several measurements where performed to answer the following questions: How easily can variations in temperature or the sensor coupling affect the results?
Measurement data communication within vehicle battery modules by plastic light guide bodies
Traction batteries for electric vehicles are usually structured in modules of 10-36 cells. Currently these modules have been equipped with a monitoring electronic unit that collects measurement data from all cells and a limited number of other sensors. This module electronic unit communicates with a central battery management system. Future
Interference Scenarios during Single Cell Impedance Measurements in Automotive Battery Packs
Electrochemical Impedance Spectroscopy (EIS) of Lithium-ion (Li-ion) battery cells receives growing interest in the field of automotive battery management systems (BMSs), often referred to as “Online EIS“. EIS is a non-destructive measurement method used for battery state estimation such as temperature, state of charge and state of health. To achieve
Identification of Li-ion batteries’ stress factors during vehicle’s service lifetime: Assessment and Analysis
Accelerated aging of Li-ion batteries plays a crucial role during pre-marketing characterization for warranty and lifetime estimation. The current methodology applied, both in standards and in literature, is solely based on overstress testing (ISO 12405 2018, IEC 62660-1). Such approach, being de-correlated from usage data [1–3], is failing to estimate
Experimental study on detecting and quantifying lithium-deposition with differential voltage analysis and coulomb-counting
High currents during fast charging of lithium-ion cells at elevated states of charge (SOC) induce undesired lithium deposition (LD), which leads to rapid loss of cyclable lithium and therewith an accelerated capacity fade. Furthermore, dendritic LD may penetrate the separator and can cause safety-critical conditions. Much research effort has been
Evaluation of the emission reduction potential of mobility services based on automated vehicles
Autonomous vehicles are considered the main enabler for mobility services and new ownership models in the automotive sector, since the driverless operation provides substantial benefits in terms of costs and management of the fleet. Automated vehicles, currently under development for use in mobility service fleets, are almost completely based on
Electrochemical modeling, validation and parameter identification under high current discharge conditions for a commercial Li-ion battery.
Extreme scenarios of high discharge current must be understood for better battery management system design. Physics-based modeling can give a better insight into the battery response compared to equivalent circuit models but can be challenging due to the large number of parameters. In this work, an electrochemical pseudo-2D model is
Electrical and Thermal Modeling of a Lithium Titanate Oxide based Battery for Railway Application
The electrical and thermal behaviour of a prismatic LTO cell is analyzed and modelled for different operation ranges. Afterwards the validated models are used to simulate a complete traction battery compromising of over 1000 interconnected cells for a high-power railway application. Under consideration of side cooling pipes and cell-to cell
Electrical and Thermal Modeling of a Lithium Titanate Oxide based Battery for Railway Application
The electrical and thermal behaviour of a prismatic LTO cell is analyzed and modelled for different operation ranges. Afterwards the validated models are used to simulate a complete traction battery compromising of over 1000 interconnected cells for a high-power railway application. Under consideration of side cooling pipes and cell-to cell
Dilatometry relaxation as a detection method for reversible lithium deposition in lithium-ion batteries
Fast-charging of lithium-ion batteries at low temperatures and high states of charge (SOC) can lead to accelerated ageing. The primary mechanism that causes the loss of cyclable lithium inventory under those conditions is the irreversible deposition of metallic lithium on the surface of the graphitic anode. The more significant share
Development of an online State-of-Health estimation method for lithium-ion batteries, based on bus fleet data
This study contributes to the development of an online-capable estimation method for State of Health (SoH) estimation for Li-Ion batteries. Implemented on the battery control unit, it is possible to register the aging based on four state variables. These variables include the state of charge (SoC), depth of discharge (DoD),
Calendric Ageing of 18650 Lithium-Ion Cells with Si/C Anode
Although the quality of Lithium-Ion Cells is improving tremendously over the years, the prediction of the lifetime of lithium-ion batteries is still a topic of interest. Economically the lifetime estimation is needed for guarantee issues and mitigating cost risks, when designing electric vehicles and storage applications. For electric vehicles driven
Batalyse- Software for Battery Data Evaluation and Information Management
The market for energy storage is growing exponentially. This development is accompanied by increasing activity in research and industry for the development and selection of better material systems, cells, modules and batteries. As the number of tests increases, so does the amount of test data and information. Both must be
A new method for the mechanical characterization of automotive lithium-ion pouch cells
Large-format pouch cells are widely used in the automotive industry and stacked in modules to increase energy density on battery level. Since pouch cells are packaged in a flexible foil (pouch bag) a mechanically stable module design is crucial for battery safety and optimum lifetime [1]. Design of such requires