Open AccessHigh-resolution Interferometric Measurement of Thickness Change on a Lithium-Ion Pouch Battery
Author(s) -
Germany Bohn,
J Taub,
Andreas Linke,
Sena Esen Bayer,
David Oeser,
Andreas Ziegler,
Peter Ettl,
Ansgar Ackva
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/281/1/012030
Subject(s) - materials science , interferometry , lithium (medication) , pouch , repeatability , volume (thermodynamics) , battery (electricity) , graphite , ion , optics , optoelectronics , composite material , chemistry , physics , medicine , power (physics) , organic chemistry , chromatography , quantum mechanics , anatomy , endocrinology
Volume change of graphite leads to change in thickness of battery storage layers during discharging and charging. Pouch cell lithium ion batteries are used in the field of electric vehicles and solar home storage. This paper shows a measurement setup for the three-dimensional measurement of thickness change on a flat 6.7mm thick pouch cell using a white light interferometer. With a measuring field of 7.05mm diameter the resulting 3D thickness change record contains 226000 3D readings. The measuring points have a lateral distance of 13.1μm. The repeatability of the measurement is 312.8nm for the individual values and 64.1nm for the average value. In addition, this paper shows how the storage capacity of this pouch cell drops over 30 charge cycles.