Extension of Physics-Based single Particle Model for Higher Charge-Discharge Rates
Extension of Physics-Based single Particle Model for Higher Charge-Discharge Rates
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DOI：
10.1016/j.jpowsour.2012.09.084
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发表时间：
2013-02
影响因子：
9.2
通讯作者：
S. Rahimian;Sean Rayman;R. White
中科院分区：
文献类型：
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作者：
S. Rahimian;Sean Rayman;R. White
将溶液相电荷平衡和物质平衡引入单粒子模型，建立了基于等温降阶物理的锂离子电池模型。电解质相中锂离子浓度和电位分布用多项式函数近似。电解质浓度和电极内电势采用三次多项式，而隔膜液相电势和浓度采用抛物线估算。固体颗粒内的扩散也被简化使用的近似解的基础上的固体浓度的解析解。应用上述降阶技术，全阶模型的自由度减少了100以上，而所提出的模型的电池电压的相对误差小于1%，在不同的充电-放电速率高达5C。
An isothermal reduced order physics-based Li ion battery model is developed by incorporating solution phase charge and material balances into single particle (SP) model. Li ion concentration and potential profiles in electrolyte phase are approximated by polynomial functions. A cubic polynomial is used for electrolyte concentration and potential inside electrodes, while separator liquid phase potential and concentration are estimated by parabolas. Diffusion inside solid particles is also simplified using an approximate solution based on analytical solution for the solid concentration. Applying the aforementioned reduction techniques decreases the degree of freedom of full order model by more than 100, while the cell voltage relative error of proposed model is less than 1% at different charge–discharge rates up to 5C.