大容量储能锂电池电芯产热特性研究

doi:10.12096/j.2096-4528.pgt.22135

摘要/Abstract

摘要：

研究大容量储能锂电池电芯的产热特性对于锂电池储能热管理设计有重要意义。采用实验方法测量了电芯的导热系数、比热、电芯在充电和放电过程的绝热温度特性，建立了考虑电芯内部的热传导、电芯表面与空气的自然对流换热的传热模型。数值模拟获得了充电和放电过程中电池最后达到的最高温度、最大温升随着充放电倍率变化的规律，电芯表面温度随时间的变化规律，电芯之间的最佳间距，以及冷却进风量随进风温度变化的规律。结果表明，大容量储能锂电池充电过程产热量略高于放电过程产热量。

关键词: 热管理, 大容量储能锂电池, 电芯, 产热特性, 数值模拟

Abstract:

It is important to study the heat production characteristics of large capacity energy storage lithium-ion battery cells for the design of thermal management of lithium-ion battery energy storage. The thermal conductivity and specific heat of the cell and the adiabatic temperature characteristics of the cell during charging and discharging were measured by experimental method. A heat transfer model considering the heat conduction inside the cell and the natural convection heat transfer between the surface of the cell and the ambient was presented. The maximum temperature and the maximum temperature rise of the cell during charging and discharging were obtained by numerical simulations. The variation of the surface temperature of the cell with time and the optimum-ion distance between the cells were obtained. At the same time, the variation trends of the cooling air quantity changing with the inlet air temperature were obtained. The results show that the heat production of lithium-ion battery with large capacity during charging is slightly higher than that during discharging.

Key words: thermal management, large capacity energy storage lithium-ion batteries, cell, heat production characteristics, numerical simulations

中图分类号:

TK 02

孔文俊, 张艳森, 汤效平, 张伟阔. 大容量储能锂电池电芯产热特性研究[J]. 发电技术, 2022, 43(5): 801-809.

Wenjun KONG, Yansen ZHANG, Xiaoping TANG, Weikuo ZHANG. Study on Heat Production Characteristics of Lithium-ion Batteries for Large Capacity Energy Storage[J]. Power Generation Technology, 2022, 43(5): 801-809.

图/表 11

图1 在0.5 C充电、22 ℃下的实验与仿真温度值对比

Fig. 1 Comparison of temperature between experiment and simulation under the condition of 0.5 C charging with ambient temperature of 22 ℃

图2 在0.5 C放电、22 ℃下的实验与仿真温度值对比

Fig. 2 Comparison of temperature between experiment and simulation under the condition of 0.5 C discharging with ambient temperature of 22 ℃

图3 不同充电倍率下表面温度的变化关系

Fig. 3 Change relationship of surface temperature under different charging rates

图4 不同放电倍率下表面温度的变化关系

Fig. 4 Change relationship of surface temperature under different discharging rates

图5 充电或放电过程结束时电池的最高温度和温升随充电或放电倍率的变化关系

Fig. 5 Change relationship between the maximum temperature and temperature rise of the cell at the end of the charging or discharging process and the charging or discharging rates

图6 充电过程中电芯表面温度随时间的变化

Fig. 6 Change of cell surface temperature with time during charging

图7 放电结束时电芯和流体域的温度场

Fig. 7 Temperature profiles of cell and fluid domain at the end of discharge

图8 放电结束时流体域速度场与电芯温度分布

Fig. 8 Velocity in fluid domain and cell temperature distributions at the end of discharge

图9 不同间距下电池间空气中心处流速与温度分布

Fig. 9 Flow velocity and temperature distributions at the center of the channel between cells under different spacings

图10 侧壁面温度与电池间距的变化关系

Fig. 10 Change relationship between the side wall temperature and the battery spacing

图11 最佳的进风量与进风温度的变化关系

Fig. 11 Change relationship between the optimal inlet air flux and inlet air temperature

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