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In-situ instrumentation for smart energy storage
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Fleming, Joe (2018) In-situ instrumentation for smart energy storage. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3517356
Abstract
Lithium-ion technology is an increasing choice for battery powered systems, offering long-lasting, reliable and efficient energy storage. However, significant safety and performance challenges within the technology are still apparent. The current state of the art for monitoring cells performance is typically based on observing full cell voltage and occasional temperature sensor on the skin of a cell. Consequently, it is extremely difficult to track cells’ health within complex, especially high-performance, battery systems. Therefore, a new way of characterising cells’ is required. Here we show the design and manufacturing methods of transforming normal cells into smart systems. The sensor topologies embedded into the cells were electrical temperature, electro-chemical and optical temperature sensors. This enabled in-situ and operando thermal and electrochemical data collection during cells’ real-life operations.
In this work, the impact of the sensors upon the cells performance has been shown to be negligible, with over 100 cycles conducted, versus unmodified cells for both pouch and cylindrical formats. This was validated using time and frequency domain analysis. A significant temperature difference was identified between the cell’s core and can temperatures of up to 6 °C during discharge and 3 °C during charge phase. Therefore, this work illustrates the necessity of internal cell temperature measurements for thermal management and safety validation. Lastly, with the aid of the in-situ measurement tools, certain cells can be further optimised without compromising thermal safety limits, while under particular scenarios safety limits can be breached earlier than the external sensors would indicate, showing how paramount in-situ data is to the operational safety.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries , Lithium ion batteries -- Thermal properties, Storage batteries | ||||
Official Date: | October 2018 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Warwick Manufacturing Group | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Bhagat, Rohit ; Greenwood, David G. ; Towers, David A. | ||||
Sponsors: | Jaguar Land Rover (Firm) ;Engineering and Physica l Sciences Research Council | ||||
Format of File: | |||||
Extent: | xiii, 127 leaves : illustrations, charts | ||||
Language: | eng |
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