锂电池膨胀力及位移测试试验台的开发

Development of Lithium Battery Bulk Force and Displacement Test Bench

为了测试充放电过程中锂离子电池膨胀力及膨胀位移,拟开发相应的测试试验台。该实验台由充放电系统、环境控制系统、测试系统、数据采集系统等四部分组成。为了模拟电池对测试装置响应,提出了一种表征充放电过程中锂电池热-机-电耦合作用的等效方法。基于开发的试验台,测试不同放电倍率下电池膨胀位移-荷电状态(state of charge,SOC)曲线及电池膨胀力-荷电状态曲线,使基于温度-电流电压-力的电池管理系统的开发成为可能。

In order to test the bulk force and displacement of lithium battery during the charge and discharge process,a corresponding test bench was developed.The experimental bench consisted of four parts,such as charge and discharge system,environmental control system,test system,and data acquisition system.In order to simulate battery response to the test device,an equivalent method for characterizing the thermo-mechanical-electrical coupling of lithium batteries during charging and discharging was proposed.Based on the developed test bench,it made a battery management system based on temperature-current-voltage-force coupling possible by testing the battery displacement-state of charge curve and battery bulk force-SOC curve under different discharge rates.