可充电锂电池剩余电量预测方法

Method of predicting residual power of rechargeable lithium batteries

为了对锂离子电池剩余电量(SOC)进行准确测量,以2 200 mA?h的聚合物锂电池为研究对象,利用Hyperion平衡充放电设备采集6个不同放电电流下(0.7,1.1,1.7,2.2,2.7和3.3A)的放电电压和放电倍率;采取误差反向传播(BP)和径向基函数(RBF) 2个原理不同的神经网络算法进行SOC预测;把采集的样本数据分为训练组和测试组,采用不同的神经网络算法对训练组进行训练后,选择合适的参数构建神经网络,并用测试组数据进行测试;最终比较2种算法的预测效果和误差。研究结果表明:RBF预测结果的相对误差比BP的低,且预测速度更快,RBF较BP更适合于锂离子电池剩余电量的预测。

In order to accurately measure SOC(state of charge)of lithium ion batteries,the discharge voltage and discharge rate of 6 different discharge currents(0.7,1.1,1.7,2.2,2.7 and 3.3 A)were collected by using Hyperion balanced charge and discharge equipment with 2 200 mA·h polymer lithium battery as the research object.The neural network algorithm based on backpropagation(BP)and radial basis function(RBF)was used.Collected sample data was divided into training group and test group.After training the training group with different neural network algorithms,appropriate parameters were selected to construct the neural network and the test group data were tested.Finally,predicted results and errors of the two algorithms were compared.The results show that the average relative error of RBF prediction is lower than that of BP,and the prediction speed is faster,therefore,RBF is more suitable for the prediction of residual capacity of lithium-ion batteries than BP.