Cylindrical battery with high volume utilization rate and assembly process thereof

Abstract

The invention provides a cylindrical battery with high volume utilization rate and an assembly process thereof, the cylindrical battery comprises a roll core, a shell assembly, a confluence disc and a cover plate, an elastic structure and a welding part on the confluence disc are arranged in a staggered manner to form a multi-petal structure, a confluence disc boss is arranged at the center of the confluence disc, and the direction of the confluence disc boss is the same as that of the elastic structure; one tab of the roll core is fixedly connected with the welding part to form a roll core assembly, the roll core assembly is inserted into a shell of the shell assembly, the confluence disc boss is welded with a pole of the shell assembly, a cover plate is arranged above the roll core assembly, and the cover plate is fixedly connected with the shell and the other tab of the roll core. According to the cylindrical battery with the high volume utilization rate and the assembly process thereof, the volume utilization rate and the energy density of the battery cell are improved, the heat-conducting property is greatly improved, and the service life of the battery is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a cylindrical battery with high volume utilization rate and an assembly process thereof. Background technique [0002] The structure of the cover plate of the traditional cylindrical battery is complex; the cap is used as the positive electrode, and the shell is used as the negative electrode. When assembling a battery module, the conductive connection of the positive and negative electrodes from both ends of the cylindrical battery is not convenient for the design and welding of the busbar of the external module; The tabs have little effect on the power performance of the battery; the method of connecting the busbar to the winding core and then connecting it to the cover plate, and the method of using the rolling groove sealing method, the rolling groove position needs to occupy at least 2-3mm space, which reduces the space utilization of the battery core. an...

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Problems solved by technology

[0002] The structure of the traditional cylindrical battery cover plate is complicated; the cap is used as the positive electrode, and the shell is used as the negative electrode. The tabs rarely affect the power performance of the battery; the method of connecting the bus plate and the winding core to the cover plate after welding, and the method of rolling groove sealing, the location of the rolling groove needs to occupy at least 2~3mm space, which reduces the space utilization of the battery cell and energy density; the winding core and the confluence plate are welded and then connected to the cover plate, which takes up space and affects the volume utilization rate and energy density of the battery cell; after the diameter of the cylindrical battery increases, it is easy to move during use, affecting the welding point and resulting in false welding , affecting performance and service life; with the increase of cylinder size, it is difficult for the existing lug form or structural form to quickly conduct heat and heat transfer, and at the same time increase the welding tooling, resulting in low work efficiency

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