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| 动力电池内部温度梯度反演计算 |
| Inversion calculation of the temperature gradient in a traction battery |
| 投稿时间：2022-03-16 |
| DOI：10.13259/j.cnki.eri.2023.01.008 |
| 中文关键词: 动力电池 热流密度 温度梯度 温度反演算法 |
| 英文关键词:traction battery heat flux temperature gradient inversion algorithm of temperature |
| 基金项目:国家重点研发计划项目(2018YFB0104400) |
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| 中文摘要: |
| 电池在充放电过程中内部温度的分布特征对于锂离子电池热管理系统的设计十分重要。根据电池的物理结构，将圆柱型电池内部平均分成若干等温层，建立了电池沿径向的产热和传热模型，将测试获得的电池表面温度和热流密度作为边界条件，假设热量从中心向外传递过程中等温层之间的热流密度线性增加，提出了一种计算电池沿径向内部温度分布的方法，并在电池内部中心放置热电偶，验证了该方法的准确性。计算结果表明，电池内部温度并非线性分布，在靠近电池中心位置处相邻等温层之间的温度梯度较小，而在靠近电池表面区域附近相邻等温层之间的温度梯度较大。该计算方法在20～40 ℃环境温度区间内具有较高的精度，而在−10 ℃环境温度下误差会偏大些。 |
| 英文摘要: |
| The temperature distribution in a battery during the charging or discharging process is critical for designing the lithium-ion battery thermal management system. A cylindrical battery was divided into several isothermal layers equally according to the physical structure, and the heat transfer model along its radial direction was established. With the assumption that the heat flux among the isothermal layers increased linearly during the heat transfer from the center to outside, a method for calculating the internal temperature distribution along the radial direction of the battery was proposed using the tested surface temperature and heat flux as the boundary conditions. The accuracy of the calculation method was verified by a built-in thermocouple in the battery. The calculation results show that the non-linear distribution of the internal temperature in the battery was observed, and the temperature gradient between the neighboring isothermal layers near the center of the battery was small, while it was large near the battery surface. High accuracy of the proposed calculation method was achieved within the temperature range of 20 ℃ to 40 ℃, while larger deviation at −10 ℃ was observed. |
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