2016
DOI: 10.1149/2.0831610jes
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Dimensional Changes in Automotive Pouch Li-Ion Cells: A Combined Thermo-Mechanical/Electrochemical Study

Abstract: In this work it is proposed an integrated measurement system able to measure simultaneously mechanical properties, dimensional variations and Young modulus, of a pouch lithium-ion battery under operative conditions. At the same time, the designed integrated system allows also the measurement of both electrochemical main quantities (current and potentials) and temperature distribution. The complex testing capabilities system was implemented in an owner-lab-made apparatus. Experimental data collected both under … Show more

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Cited by 11 publications
(6 citation statements)
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“…Another fact is that the graphite (especially with silicon) structure expands and shrinks significantly during charging and discharging process, thereby resulting in the volume expansion of the cell. [16][17][18][19][20] Considering that the lithium-ion batteries usually operate under constrained conditions such as being wrapped with a plastic pouch or a metallic shell casing, the volume expansion in a constrained space may induce a field of internal stress and subsequently influence the mechanical and electrical behaviors of the cell. [21][22][23][24][25] In summary, the mechanical response of battery cell subjected to external loading could vary with SOC in two possible mechanisms: (1) the change of mechanical properties of cathode and anode coatings, and (2) internal stress induced by the volume change during charging.…”
mentioning
confidence: 99%
“…Another fact is that the graphite (especially with silicon) structure expands and shrinks significantly during charging and discharging process, thereby resulting in the volume expansion of the cell. [16][17][18][19][20] Considering that the lithium-ion batteries usually operate under constrained conditions such as being wrapped with a plastic pouch or a metallic shell casing, the volume expansion in a constrained space may induce a field of internal stress and subsequently influence the mechanical and electrical behaviors of the cell. [21][22][23][24][25] In summary, the mechanical response of battery cell subjected to external loading could vary with SOC in two possible mechanisms: (1) the change of mechanical properties of cathode and anode coatings, and (2) internal stress induced by the volume change during charging.…”
mentioning
confidence: 99%
“…The LIB was placed inside a chamber at a temperature of 25 °C, and the increase in temperature during both charge and discharge of the LIB was monitored. 41 The temperature increased up to 31.1 °C during discharge, possibly because of the imbalanced resistance of the electrodes at the charge and discharge states. During the charging process, the temperature decreased and subsequently increased again, similar to a previous report.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…As the charging and discharging of LIB change the temperature in addition to the volume change, the temperature response of the CNT sensor was also characterized. To isolate the effect of thermal expansion of the PDMS substrate, the CNTs were coated on a glass substrate following an identical process as a control.…”
Section: Resultsmentioning
confidence: 99%
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“…The chosen mechanical parameterization in the mentioned studies seems to not always consider the state-of-charge (SoC) or pressure-dependence of battery electrode's compressive properties that are reported in the literature. 2,15,16,[44][45][46] However, silicon electrodes in particular heavily change their mechanical structure upon lithiation. This happens because the volumetric share of the active material within the electrode changes upon active material expansion, 31 and due to SoC-dependent mechanical active material properties.…”
Section: List Of Symbolsmentioning
confidence: 99%