非破壞性檢測鋰離子電池健康及荷電狀態

Abstract

鋰離子電池廣泛的應用於電子3C產品中，並可為電子商品供電，然而電池隨著使用時間及存放時間越久，其電池會逐漸老化，若電池充放電超過截止電壓，電池亦有過充或過放的問題，易造成電池表面溫度過高，造成電池熱失控[29]，基於以上的原因，對電池健康程度的監控及電量監控就非常重要。 電池在充放電過程及循環過程中，由文獻[5][24]中提及在電池中的電極層間，電解液分佈不均、氣體生成、裂縫產生等。文獻[11][26][27]研究超聲波檢測中波傳遞的時間隨著SOC及SOH而有所變化，文獻[9]將針對一個循環的充放電過程，進行超聲波在不同SOC的檢測，並發展出一套超聲波訊號和SOC間的關係。 本研究將透過同一循環下，不同SOC的超聲波檢測。不同SOH下，其超聲波訊號隨著SOC的變化情形。不同溫度下，全新電池的超聲波檢測。藉由這三者間的關係，發展出一套完整的超聲波檢測模型，透過電池表面溫度、超聲波檢測，可得知不同溫度下，電池SOH及SOC。

Lithium-ion batteries are widely used in electronic products as the power supply.However, degradation of battery will be happened when the battery is used over the long period of normal cycling or storage.The battery will be overcharged or overdischarged when the battery is charged or discharged over cut-off voltage.It can cause high temperature on the surface of the battery and thermal runaway.Based on the above reasons, health monitoring of Lithium-ion batteries and state of charge monitoring are very important. Literature[5][24] have reported eletrolyte nonuniformity,gas generation,cracks within the electrode layer of batteries during the battery is charged or discharged and cycled.Literature[11][26][27] studied ultrasonic inspection associated with the change of the state of charge and state of health. Literature[9] developed a linear model between the ultrasonic inspection and SOC over one cycle. This study will use ultrasonic inspection associated with the change of SOC over one cycle and different cycle,and different temperature.By the relationship of three,we will develop complete model of ultrasonic inspection.By temperature on the surface of the battery, ultrasonic inspection,we can aquire SOC and SOH of the battery.