微电网储能电池寿命衰减模型研究

Research on battery life decay model for microgrid energy storage

储能电池在微电网系统运行中放电倍率具有随机性导致其寿命难以准确预估.针对微网运行场景下蓄电池的寿命预测问题,提出了一种用于微电网储能电池寿命估算的衰减模型.将放电倍率对储能的影响折合在储能荷电状态和放电深度中,考虑日历衰减、循环衰减的综合作用和固体电解质界面膜形成机理,获得更能真实反映微电网储能电池寿命衰减特性的模型.不同运行条件下电池的循环测试和模型对衰减数据的拟合实验验证了该模型的预估精度和适用性.

The discharge rate of the energy storage battery in the operation of the microgrid system is random,which makes it difficult to accurately predict its life.Aiming at the problem of battery life prediction in microgrid operation scenarios,a degradation model for life estimation of microgrid energy storage batteries is proposed.In the paper,the effect of discharge rate on energy storage is equivalent to state of charge and depth of discharge of energy storage,and the combined effects of calendar decay,cyclic decay and solid electrolyte interface film formation mechanism are considered to obtain a more realistic reflection of the life degradation characteristics of the microgrid energy storage battery.The cycle test of the battery under different operating conditions and the fitting experiment of the model to the attenuation data verify the prediction accuracy and applicability of the model.