Development of high specific energy lithium-sulfur cell module based on mechanical simulations

doi:10.19799/j.cnki.2095-4239.2020.0335

Abstract

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

CLC Number:

TM 912

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.

Figures/Tables 14

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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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