基于机械仿真和测试的高比能量锂硫电池模组开发

doi:10.19799/j.cnki.2095-4239.2020.0335

摘要/Abstract

摘要：

基于高能量密度锂硫电池集成的锂硫电池模组，较传统的锂离子电池模组而言，具有更高的比能量，是未来动力电池产业的重要发展方向。为了开发一款能够满足大众电池模组结构强度标准要求和实际装车需求的锂硫电池模组，本工作基于汽车V模式开发的思想，通过梳理电池模组基本功能的需求定义，结合项目前期对锂硫电池正负极材料、热特性和循环特性等属性的研究，根据大众标准中的冲击、挤压和随机振动等机械仿真要求，总结归纳了锂硫电池模组的设计需求。在设计验证阶段，本项目完成锂硫电池电芯和模组的功能和结构设计，再通过锂硫电池模组的试制和测试验证，完成了整个锂硫电池模组的开发过程。本工作设计开发的锂硫电池模组运用了镁合金、PC(poly carbonate)+ABS(Acrylonitrile Butadiene Styrene)等轻质高强度材料，其能量密度达到了250 W·h/kg，通过了大众标准要求的各项机械性能测试。这种轻量化的模组结构设计在提高模组的能量密度、保持足够的结构强度的同时，还具备良好的散热性能，通过电池模组结构强度来保持预设的锂硫电芯间的预紧力，可以提升其循环性能。

关键词: 锂硫电池, 电池模组, 机械仿真

Abstract:

Compared with the traditional lithium-ion battery module, the lithium-sulfur battery module based on high energy density lithium-sulfur battery has higher specific energy, which is an important development direction for the power battery industry in the future. Developing a lithium-sulfur battery module requires meeting the VW (Volkswagen) battery module structure strength standard and actual car-loading demand. To do so, a project based on automobile V mode development sorted out the demand definition of the basic functions of the battery module, combined with the research on cathode and anode materials, thermal and cycle characteristics of the lithium-sulfur battery in the early stage of the project, and the Volkswagen standard of mechanical shock and crash test requirements. Finally, the design requirements of the lithium-sulfur battery module are summarized. During design verification, the project finished the function and structure design of the lithium-sulfur battery cell and module and completed the whole development process of the lithium-sulfur battery module through a sample trial production and test verification. The lithium-sulfur battery module designed and developed in this paper uses a magnesium alloy, PC (polycarbonate), ABS (acrylonitrile butadiene styrene) and other lightweight high-strength materials. Its energy density reaches 250 W·h/kg, which passed the mechanical property test required by the VW standard. This module structure design improves the module's energy density, maintains sufficient structural strength, and has good heat dissipation performance. Because the structural strength design of the battery module maintains the preset preload between lithium-sulfur batteries, its cycle performance is also improved correspondingly.

Key words: lithium-sulfur battery, cell module, mechanical simulation

中图分类号:

TM 912

谢彬, 孙嘉楠. 基于机械仿真和测试的高比能量锂硫电池模组开发[J]. 储能科学与技术, 2021, 10(2): 586-597.

Bin XIE, Jia'nan SUN. Development of high specific energy lithium-sulfur cell module based on mechanical simulations[J]. Energy Storage Science and Technology, 2021, 10(2): 586-597.

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材料名称	密度/g·cm^-3	弹性模量/GPa	泊松比	材料属性
镁合金	1.7	44.8	0.35	弹塑性
铜	8.9	110	0.37	弹塑性
PP	0.9	0.89	0.42	塑性
结构胶	2.58	0.06	0.2	塑性
ABS+PC	1.4	2	0.35	塑性

序号	锂硫单体安全测试项目		结果
1	参考标准： GB/T31485—2015 单体蓄电池安全性试验	过放电	通过
2		过充电	通过
3		短路	通过
4		跌落	通过
5		加热	通过
6		挤压	通过
7		针刺	通过
8		海水浸泡	通过
9		温度循环	通过
10		低气压	通过

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