﻿ 储能钠硫电池保温层优化设计
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1. 上海电力学院 能源与机械工程学院, 上海 200090;
2. 中国科学院 上海硅酸盐研究所, 上海 200050;
3. 上海电力学院 能源与机械工程学院, 上海 200090

Optimal design for thermal insulation layers of energy-storage sodium-sulfur batteries
Zhang Jianping1, Han Yi1, Liu Yu2, Zhu Qunzhi3
1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
3. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Abstract:In order to solve the problems of over large thickness, short life, poor reliability of non-vacuum thermal insulation structure for sodium-sulfur battery, the mathematical model was established by thermal conductivity theory of multi-level insulation layer structure, solid modeling and numerical simulation were done by finite element analysis software ANSYS, the impact of different thermal insulation materials on the actual performance was analyzed, and an optimal design by the actual test validation was proposed. The results indicate that the optimization design meets the design requirements, decreases the total thickness of thermal insulation structure by 37.5% by applying new thermal insulation materials, and then reduces the overall size and weight of the structure. Furthermore, the layout method of the thermal insulation materials arranged according to the material properties and thermal resistance was summarized, which ensures each material is safe and reliable under working conditions. Research results can provide technical references in design and optimization of the insulation structure for sodium-sulfur batteries and other devices in the future.
Key words: sodium-sulfur battery     thermal insulation layers     material properties     finite element analysis     optimal design

1 基本模型 1.1 物理模型描述

 图 1 保温结构示意图Fig. 1 Diagram of thermal insulation structure

1.2 基本方程

1.3 稳态热传导数值求解方法

2 保温结构优化设计方案 2.1 原保温结构设计方案

 图 2 原保温结构方案的总体布局Fig. 2 Overall layout of original thermal insulation structure

 材料 厚度/mm 导热系数/(W/(m·K)) CFB 50 0.043 CFF 20 0.041 SVB 10 0.004

2.2 原保温结构方案材料分析

2.3 优化保温结构设计方案

 图 3 优化保温结构的总体布局Fig. 3 Overall layout of optimized thermal insulation structure

 材料 厚度/mm 导热系数/(W/(m·K)) N-MTIF 30 0.017~0.023 SVB 15 0.004 GF 5 0.035
3 保温结构有限元仿真与实现 3.1 实体模型的建立与网格划分

 图 4 优化保温结构实体模型Fig. 4 Solid model of optimized thermal insulation structure

 图 5 实体模型网格划分Fig. 5 Mesh generation of solid model
3.2 载荷加载与求解

4 数值结果讨论 4.1 数值结果处理

 图 6 整体保温结构温度分布Fig. 6 Temperature distribution of overall thermal insulation structure

 测点 仿真结果/℃ 实验数据/℃ 相对误差/% 1 180.7 190 4.89 2 57.9 75 22.8 3 40.3 40 0.75 注:实验和仿真的内部温度载荷均为339℃.

4.2 实验验证与分析 4.2.1 验证实验与数据分析

4.2.2 优化保温结构的材料与误差分析

 图 7 温度沿厚度方向的变化Fig. 7 Variation curves of temperature along thickness direction

5 结 论

1) 通过应用保温与热分析领域的理论基础,结合钠硫电池保温结构整体设计指标,利用一维平壁导热理论建立物理模型,采用有限元软件仿真与实验验证,得到了一种新型的保温结构设计方案.

2) 该设计方案在满足内部温度在350℃条件下,外壁温升25℃内的设计条件,通过新型保温材料的实际应用,成功将保温结构整体厚度由80 mm缩减到50 mm,缩减率达37.5%,大大缩小了保温装置整体体积,降低了重量.

3) 在非真空结构保温中,为保证部分有严格工作条件限制的材料正常使用,必须合理安排保温材料的布置位置,同时,合理的热阻分配,也能有效保证各保温材料的使用寿命,这一思路在各类保温结构中广泛适用.

4) 保温结构的设计思路和采用的数值计算方法,在保温结构设计以及其他热分析领域具有广泛的适用性,并为钠硫电池配套保温装置的生产提供了重要指导.

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#### 文章信息

Zhang Jianping, Han Yi, Liu Yu, Zhu Qunzhi

Optimal design for thermal insulation layers of energy-storage sodium-sulfur batteries

Journal of Beijing University of Aeronautics and Astronsutics, 2014, 40(12): 1648-1653.
http://dx.doi.org/10.13700/j.bh.1001-5965.2013.0758