được diễn đạt khá tốt

được diễn đạt khá tốt

Kết quả (Anh) 1:

well expressed

Kết quả (Anh) 2:

Introduction Recently, owing to air pollution and global warming issues, interest in electric vehicles (EVs) and plug-in hybrid vehicles (PHEVs) has increased greatly. The batteries used in electric vehicles are mostly lithium-based secondary batteries because of their weight and mileage. Lithium-ion batteries have continued to gain market share in the secondary battery market over the last several years. This is because of their high quality density, low self-discharge and many applications [1.2]. Therefore, the demand for durability of lithium ion batteries is increasing [3.4]. In addition, improving the charging time and efficiency of the battery is an important issue in all battery powered applications. The demand for fast charging is increasing in the case of batteries for electric vehicles [5]. The use of electric cars is increasing the need for fast chargers. Various charging technologies have been developed to improve the condition, life cycle, charging time and charging efficiency of lithium-ion batteries [2.6 – 10]. Among various technologies, constant current (CC) and constant voltage (CV) Charging methods are widely used [1.11]. CC – CV charging technology, charges with CC below the threshold voltage. When the threshold voltage is reached, the current gradually falls, charging to a constant voltage. The magnitude of the CC and CV depends on the battery specifications. The disadvantage of this charging technique is that it reduces the charge current in the CV section to prevent battery damage owing to overvoltage. Therefore, the charging time is extended in this section [6]. InthecaseofCC – CVcharging, Thechargingtimeislongbecausethechargingspeedisslow. Anothermethodistochargewithacurrenthigherthantheratedcurrentforfastcharginguntilthe battery voltage reaches the set threshold. After The CC period, the charging current should be reduced

Kết quả (Anh) 3:

It's a good speech.