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Sensors 2018, 18(11), 3808; https://doi.org/10.3390/s18113808

Pressure Monitoring Cell for Constrained Battery Electrodes

1
Electrical Energy Storage Systems, Institute for Photovoltaics, University of Stuttgart, 70569 Stuttgart, Germany
2
Sensor Technology, Institute for Photovoltaics, University of Stuttgart, 70569 Stuttgart, Germany
Current address: Pfaffenwaldring 47, 70569 Stuttgart, Germany.
*
Author to whom correspondence should be addressed.
Received: 4 October 2018 / Revised: 31 October 2018 / Accepted: 2 November 2018 / Published: 6 November 2018
(This article belongs to the Special Issue Sensors for Prognostics and Health Management)
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Abstract

Testing of improved battery components and new electrochemical energy storage materials in a coin cell format as a test cell is becoming the state of the art. The pressure on the electrode surfaces inside an electrochemical cell is one of the important parameters for high ionic/electronic conductivity and the cyclic lifetime. A self-designed pressure monitoring cell allows both applying an adjustable pressure and monitoring the state of charge-dependent cell pressure during cycling. The load cell shows a reciprocal behavior of the temperature sensitivity dependent on the ambient temperature and requires constant temperature conditions while monitoring the cell pressure. Further, dependent on the initial cell pressure, the relaxation time of the assembled pressure monitoring cell must be considered. The present paper describes the setup, the influence of the environment temperature and the mechanical relaxation of the pressure monitoring cell. The first cycling results, using an NCM/graphite coin cell, demonstrate the functionality of the pressure monitoring cell measuring the cell’s pressure as a function of the C-rate. View Full-Text
Keywords: battery test cell; cell pressure; volume change; constrained batteries; pressure measurement; electrode testing battery test cell; cell pressure; volume change; constrained batteries; pressure measurement; electrode testing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Singer, J.P.; Sämann, C.; Gössl, T.; Birke, K.P. Pressure Monitoring Cell for Constrained Battery Electrodes. Sensors 2018, 18, 3808.

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