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Electro-thermo-mechanical behaviours of laser joints for electric vehicle battery interconnects
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Shaikh, Usama F., Das, Abhishek, Barai, Anup and Masters, Iain (2019) Electro-thermo-mechanical behaviours of laser joints for electric vehicle battery interconnects. In: 2019 Electric Vehicles International Conference (EV), Bucharest, Romania, 3-4 Oct 2019. Published in: Proceedings of 2019 Electric Vehicles International Conference (EV) (In Press)
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WRAP-Electro-thermo-mechanical-laser-electric-vehicle-battery-Das-2019.pdf - Accepted Version - Requires a PDF viewer. Download (3411Kb) | Preview |
Abstract
An automotive battery pack used in electric vehicle (EV) comprises several hundred to a few thousand of individual Lithium-ion (Li-ion) cells when cylindrical cells are used to build the battery pack. These cells are connected in series and/or parallel to deliver the required power and capacity to achieve the designed vehicle driving range. This triggers the need for suitable joining methods capable of providing mechanical strength together with the required electrical and thermal performances. A range of joining techniques are currently employed to connect large numbers of cells, and of these, laser welding is estimated to be the one of most efficient methods. Typically, the cylindrical cell casing is made of electrical grade steel which is electrically connected to copper tabs representing the cylindrical cell terminal to tab interconnect within the battery pack assembly. This study focuses on identifying the effect of laser welding process parameters on the mechanical, electrical and thermal responses of the laser welded joints produced using a 150 W Quasi-CW IR laser. Mechanical strength is assessed by evaluating the lap shear strength of the joint whereas the electrical and thermal responses are captured using voltage sensors and a thermal imaging camera respectively. It was observed that mechanical strength of the joint is highly correlated with electrical resistance and corresponding temperature raise at the joint. Furthermore, the optical micrographs reveal the microstructural characteristics of the joint.
| Item Type: | Conference Item (Paper) | |||||||||
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| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics | |||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
| Library of Congress Subject Headings (LCSH): | Electric vehicles -- Batteries, Laser welding, Electric resistance, Lithium cells -- Cooling, Thermal analysis | |||||||||
| Journal or Publication Title: | Proceedings of 2019 Electric Vehicles International Conference (EV) | |||||||||
| Publisher: | IEEE | |||||||||
| Official Date: | 2 October 2019 | |||||||||
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| Date of first compliant deposit: | 13 November 2019 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | In Press | |||||||||
| Publisher Statement: | © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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| Conference Paper Type: | Paper | |||||||||
| Title of Event: | 2019 Electric Vehicles International Conference (EV) | |||||||||
| Type of Event: | Conference | |||||||||
| Location of Event: | Bucharest, Romania | |||||||||
| Date(s) of Event: | 3-4 Oct 2019 | |||||||||
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