Comparison and validation of methods for estimating heat generation rate of large-format lithium-ion batteries
Comparison and validation of methods for estimating heat generation rate of large-format lithium-ion batteries
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DOI：
10.1007/s10973-014-3672-z
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发表时间：
2014-02
影响因子：
4.4
通讯作者：
Jianbo Zhang;Jun Huang;Zhe Li;Bin Wu;Zhihua Nie;Ying Sun;Fuqiang An;Ningning Wu
中科院分区：
文献类型：
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作者：
Jianbo Zhang;Jun Huang;Zhe Li;Bin Wu;Zhihua Nie;Ying Sun;Fuqiang An;Ningning Wu
通过对Bernardi模型各项的估计，研究了大规格25 Ah锂离子电池的发热率。由熵系数估算了可逆热项，并与量热法的结果进行了比较。用间歇电流法、伏安特性曲线法和新发展的能量法估算了不可逆热项。使用所获得的发热率，在1C充电/放电下的平均电池温度上升计算和验证对在加速速率热量计（ARC）中测量的结果。结果表明，采用适当间隔的间歇电流法和采用软包电池的伏安特性法的结果基本一致，而能量法的结果则稍差。许多技术被发现是有效的，以规避在估计大型锂离子电池的热生成率所遇到的困难。采用与25 Ah电池相同的电极但容量大大降低（288 mAh）的袋式电池，以避免V-I特性方法中的显著温度升高。利用一阶惯性系来校正表面温升相对于内部发热的延迟。十二个热电偶被用来解释温度分布。
The heat generation rate of a large-format 25 Ah lithium-ion battery is studied through estimating each term of the Bernardi model. The term for the reversible heat is estimated from the entropy coefficient and compared with the result from the calorimetric method. The term for the irreversible heat is estimated from the intermittent current method, theV–Icharacteristics method and a newly developed energy method. Using the obtained heat generation rates, the average cell temperature rise under 1C charge/discharge is calculated and validated against the results measured in an accelerating rate calorimeter (ARC). It is found that the intermittent current method with an appropriate interval and theV–Icharacteristics method using a pouch cell yield close agreement, while the energy method is less accurate. A number of techniques are found to be effective in circumventing the difficulties encountered in estimating the heat generation rate for large-format lithium-ion batteries. A pouch cell, using the same electrode as the 25 Ah cell but with much reduced capacity (288 mAh), is employed to avoid the significant temperature rise in theV–Icharacteristics method. The first-order inertial system is utilized to correct the delay in the surface temperature rise relative to the internal heat generation. Twelve thermocouples are used to account for the temperature distribution.