An Intelligent aging-free Lithium Battery charger
|關鍵字:||鋰電池充電系統;Battery charger systemm|
Technological products have continuously made progress since the beginning of the 21st century. With the advancement of Integrated Circuit Design and associated technique, the electrical equipments, which were large before, can be minimized nowadays. The principle and the purpose of these technological products are various, but there is a common trait, that is, they use rechargeable batteries as the power source. For that reason, the batteries used as the power source dominate the utilization of the portable devices and many battery management systems (BMS) emerge as a result. Using Lithium-ion battery becomes the mainstream of power source of portable devices due to its exclusive characteristics. However, how to fast and effectively charge the battery becomes one of the top BMS issues after rechargeable batteries are increasingly important. On the other hand, the charging strategy of constant-current/constant voltage utilized by the chargers in circulation is that the current is pre-decided to charge the battery. However, we couldn’t adjust the charging current according to the battery’s condition. With aging or different situation of battery, the charging time can’t be optimized by applying same charging current to the batteries with varied aging of batteries during constant current period; what is even worse, the charging time would be prolonged. At the moment, the development target of battery charger is how to adjusting charging current in order to optimize charging time in different state of batteries. In this thesis, an intelligent aging-free Lithium battery charger is proposed to decide the current in constant current period without providing electrochemistry data when every time the charger is turned on. It achieves the purpose of fast charging by adjusting the current in constant current period according to aging effect and internal resistance of the battery and decreases charging time by 27.4%. Therefore, the charging time can be optimized by this intelligent aging-free Lithium Battery charger.