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Title: Comprehensive Battery Safety Risk Evaluation: Aged Cells versus Fresh Cells Upon Mechanical Abusive Loadings

Journal Article · · Advanced Energy Materials
 [1];  [1];  [1]; ORCiD logo [2]
  1. Department of Mechanical Engineering and Engineering Science The University of North Carolina at Charlotte Charlotte NC 28223 USA, Battery Complexity Autonomous Vehicle and Electrification (BATT CAVE) Research Center University of North Carolina at Charlotte Charlotte NC 28223 USA
  2. Department of Mechanical Engineering and Engineering Science The University of North Carolina at Charlotte Charlotte NC 28223 USA, Battery Complexity Autonomous Vehicle and Electrification (BATT CAVE) Research Center University of North Carolina at Charlotte Charlotte NC 28223 USA, School of Data Science University of North Carolina at Charlotte Charlotte NC 28223 USA

Abstract Despite their wide applications, lithium‐ion batteries (LIBs) have been struggling with their safety risks arising from different lifetime stages. Here, the NCMA pouch cell is taken as an example, and the safety of both fresh and aged cells from three milestone stages, that is, internal short circuit (ISC) triggering risk, ISC mode, and the subsequent thermal runaway (TR) consequence is investigated. By combining mechanical abusive testing and physics‐based models on commercialized cells with various states‐of‐health (SOH) and states‐of‐charge, it is discovered that the ISC triggering delays with the decay of SOH and soft ISC mode will be triggered more frequently, which is mainly due to the mechanical behaviors of the current collectors. The temperature rises and peak temperature during the subsequent TR also become milder for aged cells due to the reduced capacity and deterministic soft ISC process. Results here provide a mechanistic explanation of the safety risk comparison between the fresh and aged cells, offering cornerstone guidance to the evaluation and design of next‐generation safer LIBs.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; EE0009111
OSTI ID:
1973281
Alternate ID(s):
OSTI ID: 2418750; OSTI ID: 1983440
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 24 Vol. 13; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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