Circular collector discs for Li-ion batteries

Abstract

The invention discloses a circular collector plate for a lithium ion battery, comprising: a plate body, with a first surface facing the battery core and a second surface facing away from the battery core, the second surface is provided with several A convex strip radially and evenly distributed outward from the center of the disk body is used to divide the disk body into several fan-shaped collector areas with equal areas; and it is arranged on the second surface of the disk body and can be folded into any angle tail body. The circular current collecting plate provided by the present invention is used as the current collecting part, and the tail body that can guide the flow is arranged on it. The convex strip can divide the current collecting area into fan-shaped areas with equal areas, and the spot welding method is used to The tabs of the battery cell are evenly welded in the current collecting area. Due to the large spot welding area, the contact area between the tabs and the circular current collecting plate is large, and the solder joints are evenly distributed on the circular current collecting plate, so that the lithium ion The conduction effect of the battery is uniform, the conduction performance is very good, and it can work for a long time with a large current.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a circular collector plate for lithium-ion batteries. Background technique [0002] Lithium-ion batteries, especially lithium-ion batteries using lithium iron phosphate as the positive electrode active material, have the advantages of high specific power, long cycle life, good safety performance, and no pollution. They are the key to the rapid development of electric vehicles and hybrid electric vehicles. product. Among a series of lithium-ion battery products, batteries with cylindrical aluminum alloy casing have attracted much attention. Its special shape and material make the product's shape and size highly stable, with better high-current discharge performance, higher safety performance, and obvious corrosion resistance of the casing. improve. [0003] At present, there are many manufacturing processes for batteries with cylindrical aluminum alloy casings, but...

AI Technical Summary

Problems solved by technology

Although this method uses a protruding cylindrical platform as a current guide part, and the tabs are welded in one part, the welding process is simple, and the protruding cylindrical platform takes up less space, but this method has disadvantages, such as relatively large solder joints, which are harmful to the current flow. the stability of the

[0007] In addition, the traditional battery current guiding device is a strip-shaped metal strip, and the current is derived from the strip-shaped metal strip. When installing this type of current guiding device, the strip-shaped metal strip must be welded to the battery cell one by one, which is very inconvenient. And the distribution of diversion points is very uneven, resulting in poor diversion performance of the battery

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