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Multilayer electrochemical-thermal coupled modeling of unbalanced discharging in a serially connected lithium-ion battery module

机译：串联连接锂离子电池模块中不平衡放电的多层电化学热耦合建模

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摘要

The temperature gradient due to the battery cooling thermally drives the unbalanced discharging of a battery module, which is seldom discussed. The shortcoming of the previous modeling methodology of modules also limits the discussion. A multilayer electrochemical-thermal model considering parallel connected cells inside each battery is developed for a serially connected module to investigate the unbalanced discharging with the cooling incorporated. The unbalanced discharging intensifies significantly after the depth of discharge exceeds about 0.8. The unbalanced discharging is the most susceptible to the non-uniform cooling when the cooling performance exactly reaches to the stage of slight improvement. The discharging rate slightly aggravates the unbalanced discharging after 4 C. Reducing the initial temperature of the module exponentially aggravates the unbalanced discharging, which will increase by about 100% when the coolant temperature reduces by 5 °C. The local temperature difference of a battery aggravates the unbalanced discharging, especially when each battery has various local temperature differences. Increasing the cell number will reduce the unbalanced discharging and the reduction will be insignificant when the improvement of cooling performance becomes slight with the convective heat transfer coefficient increasing. The results are helpful to the design of cooling configurations, cooling control strategy and equalization method.
机译：由于电池冷却引起的温度梯度热驱动电池模块的不平衡放电，这是很少讨论的。以前的模型模型方法的缺点也限制了讨论。考虑每个电池内的并联电池的多层电化学 - 热模型是为串联连接的模块开发的，以研究利用冷却的不平衡排放。在放电深度超过约0.8后，不平衡放电显着增强。当冷却性能完全达到轻微改善的阶段时，不平衡放电是最容易受到不均匀冷却的影响。放电速率略微加剧4℃后的不平衡放电。减少模块的初始温度指数加剧的不平衡放电，当冷却剂温度降低5℃时，将增加约100％。电池的局部温度差会加剧不平衡的放电，特别是当每个电池具有各种局部温度差异时。增加细胞数将减少不平衡的放电，并且当冷却性能的提高随着对流传热系数增加而变得轻微时，减少将是微不足道的。结果有助于设计冷却配置，冷却控制策略和均衡方法。

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