Abstract
In this paper, an add-on type pulse charger is proposed to shorten the charging time of a lithium ion battery. To evaluate the performance of the proposed pulse charge method, an add-on type pulse charger prototype is designed and implemented. Pulse charging is applied to 18650 cylindrical lithium ion battery packs with 10 series and 2 parallel structures. The proposed pulse charger is controlled by pulse duty, frequency and magnitude. Various experimental conditions are applied to optimize the charging parameters of the pulse charging technique. Battery charging data are analyzed according to the current magnitude and duty at 500 Hz and 1000 Hz and 2000 Hz frequency conditions. The proposed system is similar to the charging speed of the constant current method under new battery conditions. However, it was confirmed that as the battery performance is degraded, the charging speed due to pulse charging increases. Thus, in applications where battery charging/discharging occurs frequently, the proposed pulse charger has the advantage of fast charging in the long run over conventional constant current (CC) chargers.
Highlights
Owing to air pollution and global warming issues, interest in electric vehicles (EVs) and plug-in hybrid vehicles (PHEVs) has increased greatly
In the case of constant current (CC)–constant voltage (CV) charging, the charging time is long because the charging speed is slow
In applications where charging/discharging occurs frequently, such as in electric vehicles, the proposed pulse charging method was proven to benefit from long-term fast charging rather than CC charging
Summary
Owing to air pollution and global warming issues, interest in electric vehicles (EVs) and plug-in hybrid vehicles (PHEVs) has increased greatly. In the case of CC–CV charging, the charging time is long because the charging speed is slow Another method is to charge with a current higher than the rated current for fast charging until the battery voltage reaches the set threshold. In this case,This the charging speed of thecharging battery increases, butrequired the cost for of the capacityincreases This is because a higher charging system is required for the battery capacity [12]. Depending on the frequency and duty of pulse charging, the charging time charging time is shorter than that of the CC–CV charger method. These by 3.4% by applying the duty-varied voltage pulse charging method These charging charging technologies require a dedicated charger with additional and software.
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