Central Innovation Programme for SMEs (ZIM) of the Federal Ministry for Economic Affairs and Energy (BMWi)
Coboc GmbH & Co. KG
Objectives and Results
The intended technological development of the planned ZIM project is a compact one,
powerful fast charging system for pedelec batteries. The development objective of KIT within the framework of the joint project is to develop a process for this purpose.
Currently, charging a pedelec battery takes at least two hours. The aim of the project is to reduce the charging time to at least half and thus achieve a charging time of one hour or less.
Contents and Approach
Reference cells are produced from possible lithium ion cells and operated at the KIT with various parameters. For example, charging methods can be specified for the various output cells so that the cells can then be quickly charged with a high current. The main objective here is to determine the parameters for the charging process in such a way that no excessive ageing occurs and no safety-critical processes occur inside the cell. The important information for the user about the remaining energy content of a battery is usually given in the form of the State-of-Charge (SoC). For this purpose, an algorithm is to be developed that also takes into account the influencing factors caused by rapid charging. A State-of-Health (SoH) determination is also being developed, which indicates the current state of health of the battery to the user or manufacturer.