Journal
IEEE ACCESS
Volume 7, Issue -, Pages 71131-71141Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2019.2918401
Keywords
Li-ion battery; reliability; iPhone battery; chemical aging; manufacturing defects; C-rates
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Funding
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2017087]
- Natural Science Foundation of Heilongjiang Province [QC2016068]
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Li-ion battery reliability has attracted significant research attention, but few studies have incorporated in-service performance and reliability data of batteries installed within a product. This paper investigates battery drain, unexpected shutdowns, and slow performance associated with Li-ion batteries, with a focus on Apple iPhones (R) as a case study. The actions taken by Apple in response to these performance issues are discussed, especially from the perspective of Li-ion battery degradation. It is shown that not all battery reliability issues can be attributed to normal battery degradation; battery manufacturing defects and high C-rate applications are also shown to be contributors to battery reliability and performance issues, including those causing a low state of charge, a low state of health, and unexpected shutdowns.
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