Cross-domain reliability analysis from individual components to the entire system during development using the example of a lithium-ion battery cell

Using the development of a lithium-ion cell as an example, an analysis of the reliability of individual components is carried out during development. For example, the effect of newly developed anode materials on the reliability of the entire system can be determined. If data are available, the effect of design specifications on (system) reliability can be calculated quantitatively down to the battery module. With the help of Bayesian Networks, the logical linking of the failure modes with quantitative failure rates from the individual component to the battery cell is represented. For the optimization process of individual components, the effect in the battery module can thus be calculated directly. This is particularly necessary because different developers are usually involved in the various sub-domains for the individual components of a lithium-ion cell. This makes it possible to keep the focus on the reliability of the overall system across company boundaries. Particularly regarding of the current increased development of battery cells without the use of critical raw materials such as cobalt, it is important to evaluate new alternatives directly in the development process, not only in terms of performance, but also in terms of reliability.