ProBat - Projecting quality-oriented, flexible battery production systems
|Serial capable production technology for battery systems exists until now primarily in consumer applications (e.g. for laptop- and mobile batteries). Lithium ion batteries (hereinafter called Li-ion battery) for the automobile industry have to fulfil strict and extensive requirements particularly in regard to life expectancy, safety, reliability, number of cycles, efficiency and energy density. Therefore they require a most extensively different production system. The fulfillment of safety requirements in the operation of the vehicle requires strict tests and precautionary measures, which are not relevant in other applications because of low voltages.
Because of the very small numbers of automobile batteries until now the production technology is still in development. “The optimization of production technology for large-scale batteries will contribute significantly to the success of electric mobility, as the share of production costs is about 50 % of the manufacturing costs of the battery.” Existing plants often have a prototypical character and are not yet sufficient regarding to flexibility, reliability and availability. Suitable integrated quality assurance measures and corresponding norms and standards need to be developed in order to ensure efficient production as the basis for profitability. An essential requirement for production technology is the efficient adaption to rising as well as fluctuating numbers of units (scalability), to fulfil an expected high volatility turnover of different drive systems and a high dynamic export market. Additionally plants need to have the capability to react fast and efficient to technological development of batteries to enable a profitable production.
The aim is the reduction of rebuilding expenditures (investments and start-up durations) and scrap rate in the battery system assemblage. Therefore a planning tool for a flexible, automated production and an integrated quality assurance is developed. Based on different automation and process alternatives a simulation model of assembly is created. Furthermore an understanding for critical stages in the process and their parameters is worked out. Afterwards suitable in-process measurement and testing procedures for the series production are selected. Therefore practical tests take place for the validation of selection guides.