Soft package battery module and assembly method

Abstract

The invention relates to a soft package battery module and an assembly method. The soft package battery module comprises a housing and a battery module installed in the housing, wherein the battery housing includes a cover shell which is approximately U-shaped on the whole, the upper end of the cover shell is provided with an upper side plate fixedly connected with the cover shell, two ends of thecover shell are provided with end plates fixedly connected with the cover shell, a side cover plate, an integrated cover plate and a high pressure cover are sequentially arranged from outside to inside between the battery module and each plate, and the side cover plate, the integrated cover plate and the high pressure cover are mutually clamped and fixed; and the battery module includes a horizontally arranged electric core assembly, the lower end of the electric core assembly is provided with a bottom side protection plate, and the upper end is provided with a top side protection plate, thereby enabling the electric core assembly to be pressed in the shell through the bottom side protection plate and the top side protection plate. According to the invention, the heat transfer between allelectric cores and between the electric cores and an outer frame of the module is realized, the electric cores and the housing are fixed by a heat conductive structure adhesive, all outer shells arewelded into a fully-enclosed whole, and the strength and safety of the battery module are improved.

Description

technical field [0001] The invention relates to a battery module, in particular to a soft pack battery module and an assembly method. Background technique [0002] The negative electrode materials of battery cells mainly include graphite and silicon carbon, among which silicon carbon has higher specific capacity and specific energy than graphite, and will be the main carrier of the negative electrode of 300Wh / kg or even higher energy density batteries in the future. But at the same time, silicon is prone to volume expansion during charging and discharging. Compared with graphite negative electrodes, the volume expansion of silicon carbon negative electrodes is larger. Experiments have proved that if no restraint pressure is applied to the cells, the charge and discharge performance of silicon carbon negative electrodes is very poor. , so it is particularly important to design a soft pack module that can give a certain binding force to the battery cells in the battery module ...

AI Technical Summary

Problems solved by technology

But at the same time, silicon is prone to volume expansion during charging and discharging. Compared with graphite negative electrodes, the volume expansion of silicon carbon negative electrodes is larger. Experiments have proved that if no restraint pressure is applied to the cells, the charge and discharge performance of silicon carbon negative electrodes is very poor. , so it is particularly important to design a soft pack module that can give a certain binding force to the battery cells in the battery module in advance

[0003] The external cover of the currently used pouch battery module is a closed cylindrical metal structure. When installing, it is necessary to give a certain amount of restraint to the battery cells inside the battery module, and the thickness of the battery module before pressurization is greater than The internal dimensions of the cylindrical shell pose a very serious challenge to the manufacturing process

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