Challenges for electrochemical and thermal characterization of Li-ion cells to improve thermal management and prevent thermal runaway

The thermal behaviour of lithium-ion cells and their active materials depend on a large variety of internal and environmental physicochemical parameters, which are still not deeply understood. Additionally, the specific materials design and the use of nanoscale materials influences heat generation and heat dissipation during operation of the electrochemical cells. Therefore thermal characterization of the cells, batteries and their individual active and passive materials is required in combination with multiscale electrical electrochemical, thermal and thermodynamic modelling to obtain quantitative and reliable thermal and thermodynamic data. Combined electrochemical-thermal characterization techniques will be presented under normal use (temperature data, heat data, ageing effects) together with safety tests under abuse and accident conditions (thermal abuse, nail penetration, short circuit, gas collection), which are needed in order to study the influence of ageing phenomena on different modes of heat generation and to collect data that can be used in battery management systems. Thus topics to be addressed include:

• Combined electrochemical-thermal characterization techniques for cells: battery calorimetry, thermography
... mehr
• Influence of ageing phenomena on different modes of heat generation
• Combination of experiments with multiscale electric, electrochemical and thermal simulations
• Using thermal and thermodynamic data in battery management systems