- 學位論文
改善鉛蓄電池效能之連續脈衝充電器
Pulse Train Charger for Improving Lead-Acid Battery Performance
摘要
鉛酸電池作為車輛的電力儲存裝置已有超過百年的歷史，而失效的原因則始終如一：電池板上生成之硫化物。本研究專注於連續脈衝充電器之設計與實現，可減少或消除硫化物衍生之電池失效。本論文提出一異於傳統充電方式之連續脈衝充電器，此連續脈衝充電器以微控制器產生脈波與充電電流經以288W/57.6V/5A之半橋LLC諧振轉換器將20 kHz 之電流脈波對電池充電，並分別以兩組使用過之鉛酸電池進行充放電實驗。 實驗結果顯示經此實驗後電池之放電表現較佳，放電時間縮短表示經連續脈波充電後降低電池電阻，電池之電荷攜帶能力確實改善。比較實驗前，電池內部電阻降至原先之三分之一。
並列摘要
Lead-acid battery has been the standard for basic energy storage device used in Electric Vehicles for more than 100 years, yet the common cause of failure remains the same – sulfation buildup on the battery plates. This study focuses on the design and implementation of a pulse train charger aimed mainly to reduce or reverse the main cause of battery failure caused by sulfation. This paper proposes a pulse train type of charging unique from that of conventional pulse charging. A burst of pulses at 20 kHz frequency is injected in the battery via a 288W/57.6V/5A Half Bridge LLC resonant converter. The pulse train charger was designed and implemented with a microcontroller that regulates the pulses and charge current delivered to the battery. The experiment is done through 2 sets of partially sulfated batteries subjected to charge and discharge cycles. Results show improvements in the discharge performance after tests. The discharge time improvement shows that the charge carrying capability of the battery has improved under pulse train charging. The discharge performance improvement is consistent with the battery impedance findings. Internal battery impedance after pulse train charging is reduced to a third from its original value.