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Introduction and application of formation methods based on serial-connected lithium-ion battery cells

Title data

Müller, Verena ; Kaiser, Rudi ; Poller, Silvan ; Sauerteig, Daniel ; Schwarz, Radu ; Wenger, Martin M. ; Lorentz, Vincent ; März, Martin:
Introduction and application of formation methods based on serial-connected lithium-ion battery cells.
In: Journal of Energy Storage. Vol. 14, Part 1 (2017) . - pp. 56-61.
ISSN 2352-152X

Official URL: Volltext

Project information

Project financing: Andere
The authors gratefully acknowledge the funding of this work by Robert Bosch GmbH. We thank the department of lithium ion batteries at the Bosch plant in Bamberg for technical support. Furthermore, the authors would also like to thank the Fraunhofer IISB and the Department of Energy Electronics for the support in implementation of the introduced circuits and the good cooperation.

Abstract in another language

The process step of formation is one key process to guarantee high performance, long-lasting and safe automotive lithium-ion cells. Since the formation of the cell is the most expensive process in cell manufacturing, reducing process cost and time is advanced. The state-of-the-art formation process includes the cycling of lithium-ion cells each on its own power electronic channel which amounts to about 38% of the total formation costs. Therefore, this paper proposes an optimized formation method by serial-connected lithium-ion cells. Due to small resistance and capacity deviations conditioned by manufacturing tolerances, charge balancing is necessary for formation of serial-connected cells. This paper introduces several serial interconnection circuits for serial cell formation, like passive balancing or drop out system. Furthermore, the associated influences on the formation process parameters, e.g. the charging profile and the charge current control are investigated. The comprehensive comparison of serial formation techniques reveals cost reduction potentials and challenges regarding the process control.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Lithium-ion batteries; Formation process; Solid electrolyte interphase; Charging
Institutions of the University: Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Jun 2022 06:48
Last Modified: 12 Aug 2022 07:10