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LioBat

Lifetime-optimized high-performance multiuse and modular battery system based on a design for easy renewability

  • German - Korean joint project
  • German project partners: Constin GmbH, TU Berlin
  • Korean project partners: Bexel, Corn CO. LTD, Kyungpook National University
  • Funded by ZIM
  • Project duration: 01.11.2019 - 31.08.2022

Motivation

With increasing awareness of the environmental impact of vehicles with combustion engine, electric mobility has increased significantly. A widely used energy storage for electric vehicles are Lithium-ion batteries which will be replaced after 5-8 years of use. These batteries are not completely out of order, but less efficient compared to new ones. Disposing of these batteries without testing if they can be used in a 2nd-life version would be a waste of rare materials. The recycling process of batteries is often tedious and less efficient. Currently there are just a few companies that properly recycle their batteries with little waste. This leads to the question if the reuse of these batteries e.g. for stationary applications is more advantageous.

Aims

This project is concerned with the development of a 48V battery system which is characterized by its life-time optimized and easy to disassemble design. A conventional battery system usually consists of many single cells which are welded together. If just one cell ages prematurely the battery loses capacity very quickly and thus becomes prematurely unusable. To equip the battery system partially or completely with new cells the new design is free of any welded or soldered connections.
One of the research focus of the project is to determine the state of health (SOH) of the battery system and/or each single cell. Determining the SOH as accurately as possible can optimize the runtime of the battery system within the 1st-life application and also building the basis of the decision whether a cell is suitable for a 2nd-life application or not. Battery management systems (BMS) currently using model-based methods to determine the SOH online (during operation) which requires extensive preliminary investigations of the used cell type and does not take the individual aging of the cells into account. Common methods for offline SOH determination are capacitance measurements or electrochemical impedance spectroscopy. Both methods are quite exact but costly in terms of time and therefore not suitable for a fully automated sorting process. The aim of the research is the evaluation of alternative parameters to determine the SOH directly. Accelerated aging tests will be performed for selection and validation of these alternative parameters. Based on the results new methods and algorithms will be developed to determine the SOH in short time and with high accuracy.

Zusatzinformationen / Extras

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Contact

M.Sc. Mano Schmitz
+49 (0)30 314-21899
Room EMH 128

Address

Technische Universit├Ąt Berlin
Electrical Energy Storage Technology
Institute of Energy and Automation Technology
Faculty IV
sec. EMH 2
Einsteinufer 11
D-10587 Berlin