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.
XIE Bin. Development of high specific energy lithium-sulfur cell module based on mechanical simulations[J]. Energy Storage Science and Technology, 2021, 10(2): 586-597
Fig. 8
(a) images of lithium sulfur battery; (b) schematic diagram of internal structure and components of lithium-sulfur batteries; (c) cycle curves of lithium-sulfur batteries
Fig. 10
(a) images of modules before shock test; (b) images of modules after shock test; (c)~(e) 50 g semi-sinusoidal wave curves in three directions x, y, z
Fig. 12
(a) power spectral density curve of random vibration simulation of lithium-sulfur cell module; (b) simulation diagram of random vibration test of lithium-sulfur cell module; (c) power spectral density curve of random vibration test of lithium-sulfur cell module and actual collected curve; (d) photos of lithium-sulfur cell module after random vibration test
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