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首页> 外文期刊>Journal of Energy Storage >Electrochemical and thermal characteristics of prismatic lithium-ion battery based on a three-dimensional electrochemical-thermal coupled model
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Electrochemical and thermal characteristics of prismatic lithium-ion battery based on a three-dimensional electrochemical-thermal coupled model

机译：基于三维电化学 - 热耦合模型的棱镜离子电池电化学和热特性

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摘要

The performance of large-size lithium-ion batteries (LIBs) is significantly affected by the internal electrochemical processes and thermal characteristics which cannot be obtained by the experimental methods directly. In this work, a 3D electrochemical-thermal coupled model is developed for 30 Ah ternary cathode LIB by coupling 3D layered electrochemical model and 3D thermal model. This coupled model is further validated by comparing simulation results with experimental values, showing the good performance of a developed model. The internal electrochemical processes and thermal characteristics, such as current density, heat generation rate and temperature distribution inside the LIB for 1D and 3D scales, of the battery are investigated at different discharge rates and ambient temperatures. It is observed that the reduction in both the discharge capacity and voltage occurred at high discharge rate and low temperature due to high polarization and transport resistance. A 3D layered model indicated the close relation between current density distribution and total heat generation rate distribution in the unit cell. Among total heat generation at low discharge rate, mostly contribution comes from the heat generated in a negative electrode while the proportion of heat generation in other components increases gradually with the discharge rate, especially in a positive electrode. Also, the effect of battery thickness and heat transfer coefficient are studied. The results show that the temperature gradients along the battery thickness and width are significantly higher for thickened battery and larger heat transfer coefficient, which causes heat inhomogeneities during the electrochemical processes. The proposed model can be used to optimize the electrode and structural design for developing better battery thermal management systems and safer batteries.
机译：大尺寸锂离子电池（LIBS）的性能受到内部电化学工艺的显着影响，包括直接通过实验方法获得的内部电化学方法和热特性。在这项工作中，通过耦合3D层电化学模型和3D热模型，为30AH三元阴极库开发了3D电化学热耦合模型。通过将仿真结果与实验值进行比较，显示出开发模型的良好性能，进一步验证了该耦合模型。在不同的放电速率和环境温度下，研究了电池的电池内部的内部电化学过程和热特性，例如Lib内的电流密度，发热速率和温度分布，电池的电池的电池中的电池。观察到，由于高偏振和传输阻力，放电容量和电压的降低发生在高放电率和低温下。 3D分层模型表明了单元电池中电流密度分布与总发热速率分布之间的紧密关系。在低放电速率下的总热量中，大多数贡献来自负电极中产生的热量，而其他组分中的发热比例随着排出速率而逐渐增加，特别是在正电极中。而且，研究了电池厚度和传热系数的效果。结果表明，对于增稠电池和较大的传热系数，电池厚度和宽度的温度梯度显着更高，导致电化学过程中的热不均匀性。所提出的模型可用于优化电极和结构设计，用于开发更好的电池热管理系统和更安全的电池。

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  • 来源
    《Journal of Energy Storage》 |2021年第10期|102976.1-102976.16|共16页
  • 作者

    Li Huanhuan; Saini Ashwani; Liu Chengyang; Yang Jufeng; Wang Yaping; Yang Tao; Pan Chaofeng; Chen Long; Jiang Haobin;

  • 作者单位

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China|Nankai Univ Coll Chem Key Lab Adv Energy Mat Chem Minist Educ Tianjin 300071 Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Sch Mat Sci & Engn Zhenjiang 212013 Jiangsu Peoples R China|Nankai Univ Coll Chem Key Lab Adv Energy Mat Chem Minist Educ Tianjin 300071 Peoples R China;

    Jiangsu Chunlan Clean Energy Res Inst Co Ltd 73 Beichang Rd Taizhou 225300 Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Automot Engn Res Inst 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Three-dimensional Electrochemical-thermal coupled model; Lithium-ion battery; Electrochemical and thermal characteristic analysis; Heat transfer coefficient;

    机译：三维电化学热耦合模型;锂离子电池;电化学和热特性分析;传热系数;

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