Abstract
Pulse charging of lithium-ion polymer batteries (LiPo), when properly implemented, offers increased battery charge and energy efficiencies and improved safety for electronic device consumers. Investigations of the combined impact of pulse charge duty cycle and frequency of the pulse charge current on the performance of lithium-ion polymer (LiPo) batteries used the Taguchi orthogonal arrays (OA) to identify optimal and robust pulse charging parameters that maximize battery charge and energy efficiencies while decreasing charge time. These were confirmed by direct comparison with the commonly applied benchmark constant current-constant voltage (CC–CV) charging method. The operation of a pulse charger using identified optimal parameters resulted in charge time reduction by 49% and increased charge and energy efficiencies of 2% and 12% respectively. Furthermore, when pulse charge current factors, such as frequency and duty cycle were considered, it was found that the duty cycle of the pulse charge current had the most impact on the cycle life of the LiPo battery and that the cycle life could be increased by as much as 100 cycles. Finally, the charging temperature was found to have the most statistically significant impact on the temporarily evolving LiPo battery impedance, a measure of its degradation.
Highlights
IntroductionIn the age of ubiquitous use of lithium-ion polymer (LiPo) batteries in many battery-powered portable electronic devices [1], battery charging has become an imperative topic of research
In the age of ubiquitous use of lithium-ion polymer (LiPo) batteries in many battery-powered portable electronic devices [1], battery charging has become an imperative topic of research.Inappropriate and ineffective battery charging can have adverse effects on the battery and result in limited battery cycle life or even thermal runaway
The pulse charging of a LiPo battery at the optimal parameters, i.e., 50% duty cycle, 12 kHz, and 23 ◦ C, resulted in an additional 100 cycles when compared with a battery charged using the standard constant current-constant voltage (CC–CV) charging algorithm
Summary
In the age of ubiquitous use of lithium-ion polymer (LiPo) batteries in many battery-powered portable electronic devices [1], battery charging has become an imperative topic of research. Market research project li-ion batteries to reach USD 67.7 billion by 2022 and USD 92 billion by 2024 [7,8] This is due to their high energy density and low self-discharge rate. LiPo batteries use gel-like polymer electrolytes that aids in a more flexible form factor and lighter weight [9]. Li-ion polymer usesemisolid a high-conductivity to batteries, use a liquid electrolyte [9]. Thebatteries polymeric allows the polymeric battery to semisolid theform electrolyte ion movement compared to Li-ionsafety batteries, be formedto insupport different factors and withimprove the additional advantages of improved and which good use a liquidstrength. The benchmark against which all other proposed charging methods are compared
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