Battery aging

Dismantling of an aged 18650 round cell: view of the electrode coating.
© Fraunhofer IFAM

Dismantling of an aged 18650 round cell: view of the electrode coating.

Battery and aging tests under defined conditions.
© Fraunhofer IFAM

Battery and aging tests under defined conditions.

REM image in cross-section of an aged electrode: delamination and crack formation within the active layer.
© Fraunhofer IFAM

REM image in cross-section of an aged electrode: delamination and crack formation within the active layer.

Both the lifetime and aging of a battery are determined by a number of factors and can be directly influenced by the choice of operating conditions. An essential aspect is hereby battery safety, which must always be ensured over the entire lifecycle. Therefore, it is necessary to be aware of the causes, mechanisms, and influencing factors of battery aging, whereby a distinction should be made between the cyclical and the calendar aging of a battery. Aging tests under defined conditions help to develop the optimal operating conditions for the respective application.

A further issue in addition to safety is the disposal of batteries. Battery recycling, reuse, and second life are thus also current issues that we are addressing in our department.

To improve battery safety during operation, we concern ourselves with battery monitoring, including new possibilities for the precise monitoring of the battery. New concepts regarding sensor integration to monitor the condition of the battery at the level of the cell are an essential focus point of our work.

We conduct aging tests for all battery sizes and types at both the cell and module levels as well as for large-scale batteries, evaluate their possible application scenarios, and offer our clients a comprehensive consultation on the topic of safety.