Flattening method for all-tab cylindrical battery

Abstract

The invention belongs to the technical field of batteries, and discloses a full-tab cylindrical battery rubbing method and a full-tab cylindrical battery. The method comprises the following steps: rotating to a first position from the outer ring of a battery cell kneading plane to the center direction by using a first kneading wheel; and the second rubbing wheel rotates to a second position from the center of the battery cell rubbing plane to the outer ring direction, and the path through which the first rubbing wheel passes and the path through which the second rubbing wheel passes do not coincide. According to the method, under the condition that the tab foil is not increased, the thickness of the rubbing plane of the welding area of the collector plate is effectively increased, the thickness of the non-welding area is reduced, the welding yield of the collector plate is improved, the infiltration rate of electrolyte is improved, and the problem that the rubbing plane blocks the center hole is solved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a flattening method for a full-tab cylindrical battery. Background technique [0002] Kneading is a key process in the manufacturing process of all-tab batteries. When the battery cell is not flattened, the end of the battery cell is not flat, there may be flanging and more burrs, and there is still a certain degree of concentricity relative to the battery cell body. In order to facilitate the follow-up current collector plate welding at the end of the battery core and ensure the welding quality, it is necessary to flatten the end of the battery core, knead the upright lugs of the cylindrical core into a plane, and make the lugs of each layer tightly touch. The burning of the winding core is a common problem in the process of welding the collector plate and the winding core. The thickness of the kneading plane has a great influence on the laser welding effect of the collecto...

AI Technical Summary

Problems solved by technology

However, increasing the amount of foil in the kneading area will, on the one hand, increase the weight of the battery and increase the cost of the battery; on the other hand, it will reduce the speed of the electrolyte passing through the kneading plane, thereby affecting the infiltration rate of the electrolyte into the inside of the winding core

In addition, with the existing kneading technology, the center hole of the winding core on the kneading plane is blocked, which affects the smoothness of the central hole exhaust. When the battery encounters extreme conditions (such as thermal runaway of the battery cell), the battery cell Poor exhaust can lead to significantly increased safety risks

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