Roll core assembly structure and method

Abstract

The invention provides a roll core assembly structure and method. The roll core assembly structure and method are used for assembling a roll core, and the roll core comprises a roll core body and a tab extending from the roll core body. The assembly structure comprises: a partition plate assembly comprising a partition plate body, wherein the partition plate body comprises a top wall and at least one side wall, the top wall and the side walls define a containing part used for containing the roll core body, and the partition plate assembly further comprises a connecting piece arranged on the top wall and having conductivity; and a cover plate assembly including a substrate having a first surface and a second surface, a conducting strip arranged on the first surface and used for being connected with the connecting strip, and a pole arranged on the second surface, wherein the pole is electrically conducted with the conducting strip. According to the specification, the manufacturing qualification rate can be improved, and multi-roll core assembly can be carried out.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a winding core assembly structure and assembly method. Background technique [0002] At present, the winding core assembly of power lithium batteries mostly adopts the "butterfly welding" method. Take the assembly of two winding cores as an example, such as figure 1 As shown, first pre-solder the tabs 2 of the core 1, and then face the tabs 2 of the two cores 1, and place the tabs 2 between the connecting sheet and the small protective sheet, and then connect the The tabs, the tabs 2 and the small protective sheet are welded together, so that the tabs 2 of the two winding cores 1 are connected as one. Subsequently, if figure 2 As shown, bend the connecting part of the tab 2, put the winding core 1 into the shell, and install the cover plate 3 above the tab 2 to complete the assembly. However, there are still certain defects in this assembly method, ma...

AI Technical Summary

Problems solved by technology

[0003] 1) During the pre-welding and final welding of the tabs of the winding core, dust will inevitably be generated, and the dust will easily enter the inside of the winding core;

[0004] 2) When the winding core is put into the shell, it is easy to scratch between the aluminum shell and cause a short circuit of the battery;

[0005] 3) The above assembly method needs to reserve a long tab for core assembly, which increases the manufacturing cost;

[0006] 4) After welding, the lug is subjected to a large force due to bending, and it is prone to the risk of breaking due to pulling;

[0007] 5) After the tab is bent, it is located between the cover plate and the winding core of the aluminum shell. The bent tab prevents close contact between the cover plate and the battery core, resulting in a large gap between the cover plate and the winding core. Limits the improvement of battery energy density;

[0008] 6) The above assembly method is currently applicable to the assembly of double winding cores, and cannot adapt to the parallel assembly of more winding cores

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