UofM pouch cell voltage and expansion dataset and modeling code

The goal here is to study the voltage and expansion response of lithium-ion batteries at different charging rates. Specifically, the goal is to capture the observation of the smoothing of the peaks in dV/dQ and retention of the peaks in d^2 \delta/dQ^2 at higher C-rates. The retention of the peaks at higher charging rates enables better estimation of the cell capacity. To achieve this goal a reduced order electrochemical and mechanical model with multiple particles with a size distribution is developed. This allows us to capture the smoothing and preservation of the phase transitions in the voltage and expansion measurements at high C-rates, respectively. The model is written in Matlab software.

本研究旨在探究不同充电倍率（C-rate）下锂离子电池的电压与膨胀响应特性。具体而言，本研究旨在捕捉高充电倍率下dV/dQ曲线峰的平滑化现象，以及d²δ/dQ²曲线峰的保留现象。高充电倍率下的峰保留特性有助于更精准地估算电池单体容量。为达成上述研究目标，本研究构建了一款考虑粒径分布的多颗粒降阶电化学-机械耦合模型。该模型可分别捕捉高充电倍率下电压测试与膨胀量测试中相变的平滑化与保留特性。本模型基于Matlab软件编写实现。