Thermal Substitute Cells for Validation of Lithium-ion Battery Systems
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Thermal Substitute Cells for Validation of Lithium-ion Battery Systems
The continuing progress in the development of lithium-ion batteries is leading to range extension with simultaneous cost reduction and shorter charging times. The development cycles for batteries can be further shortened by means of substitute cells. This enables manufacturers to always use the best performing cell technology in new vehicles.
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DEVELOPING LITHIUM-ION BATTERIES IN SHORT CYCLES
To ensure the sustained success of electric vehicles in the marketplace and further improve customer confidence, addressing the issues of range extension, cost reduction and shorter charging times is paramount. Battery systems constitute the point of departure of these developments: lithium-ion cell technology continues to develop dynamically and improve even further. The ongoing challenge therefore lies in always being
AUTHORS
Philipp Seegert is Research Associate at the Institute for Thermal Process Engineering (TVT) of the Karlsruhe Institute of Technology (KIT) in Karlsruhe (Germany).
Sabrina Herberger is Technical Assistant at the Institute of Thermal Process Engineering (TVT) of the Karlsruhe Institute of Technology (KIT) in Karlsruhe (Germany).
able to apply the latest, and best performing cell technology in the vehicle. Efforts are underway to shorten the development cycles of lithium-ion batteries while complying with all applicable validation and quality requirements. Thermal management is a key factor to meet today’s requirements: The ongoing increase of energy density of lithium-ion cells and elevated heat generation during fast charging with currently up to 350 kW require efficient thermal conditioning of the battery to ensure its performance and longevity. Next generation thermal management systems are highly integrated into the battery system and design and validation of these systems continuously shifts from component to system level. In light of the above, new development methods and tools are required to efficiently introduce new innovative technologies, accelerate the validation of battery systems and improve their performance. Thermal substitute cells are a powerful development tool for the validation of new thermal management systems and battery concepts.
André Loges is Lead Engineer in the Battery Systems Division of the Central Advanced Engineering Thermal Management at Mahle International GmbH in Stuttgart (Germany).
electrochemical storage function is removed. This yields multiple benefits that underline the particular importance of substitute cells as a development tool: –– reduction of development time –– improvement of efficiency and quality of thermal management systems –– reduction of validation costs. To operate substitute cells, no complex equipment such as battery cyclers is required; in fact, simple control solutions in the low-voltage range will be sufficient. Hazards caused by leaking substances or by thermal runaway cease to exist. Safety equipment according to hazard levels [1] and high voltage
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