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Modelling and characterisation of ultrasonic joints for Li-ion batteries to evaluate the impact on electrical resistance and temperature raise
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Das, Abhishek, Rajan, Ashwin T. and Barai, Anup (2019) Modelling and characterisation of ultrasonic joints for Li-ion batteries to evaluate the impact on electrical resistance and temperature raise. Journal of Energy Storage, 22 . pp. 239-248. doi:10.1016/j.est.2019.02.017
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WRAP-modelling-characterisation-ultrasonic-joints-batteries-impact-Ashwin-2019.pdf - Accepted Version - Requires a PDF viewer. Download (2207Kb) | Preview |
Official URL: https://doi.org/10.1016/j.est.2019.02.017
Abstract
In automotive and stationary Li-ion battery packs, a large number of individual cells, typically hundreds to thousands of cells, are electrically connected to achieve pack specification. These large number of interconnections are mainly achieved by welding cell tab to bus-bar using a welding technique of choice. Ultrasonic metal welding (UMW) is one of the common joining technique employed to join pouch cell’s tabs to bus-bar. Although commonly employed, there is little research currently exist in literature reporting the joint characteristics in terms of electrical resistance and temperature raise due to charge-discharge current. Li-ion batteries reaching sub-milliohm internal resistance, risks the temperature raise at the joint could be even higher than the cell itself which raise a serious safety concern and they are to be addressed. This research investigates the electrical and thermal characteristics of ultrasonic joints of 0.3 mm aluminium/nickel coated copper tabs to 1.0 mm copper bus-bar. This article reports the dynamic behaviour of electrical resistance and corresponding temperature increase as a result of current flow. To capture the electrical and thermal behaviour of the joint, a numerical model has been developed and validated with experimental results, which can be employed to analyse battery pack performance.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TS Manufactures | ||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Ultrasonic welding | ||||||||
| Journal or Publication Title: | Journal of Energy Storage | ||||||||
| Publisher: | Elsevier | ||||||||
| ISSN: | 2352-152X | ||||||||
| Official Date: | April 2019 | ||||||||
| Dates: |
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| Volume: | 22 | ||||||||
| Page Range: | pp. 239-248 | ||||||||
| DOI: | 10.1016/j.est.2019.02.017 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| RIOXX Funder/Project Grant: |
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