Method and system for manufacturing battery cathode

Abstract

The invention relates to a method and a system for manufacturing a battery cathode. The method for manufacturing the battery cathode comprises the following steps: S1, continuously coating slurry on two lateral surfaces of a base material to form a base material with the slurry; S2, drying the base material with the slurry; S3, cutting the dried base material with the slurry to form the battery cathode; and S4, forming a thinning section on the base material in a set distance, wherein the thickness of the slurry on one lateral surface of the thinning section is smaller than that of the slurry at other positions. When the base material is cut to be used as the battery cathode, the tail of the battery cathode is the thinning section, and the slurry on the outside surface is thinner; therefore, the use of the slurry is reduced and the cost is saved; and the thickness of the battery cathode is reduced, so the battery cathode is favorable for reducing the assembly ratio of a battery, the assembly is more convenient, the rejection rate of the battery short circuit can be reasonably controlled, and the yield can be improved. The slurry scraped at the thinning section of the base material can be reclaimed, so the method and the system avoid waste of the slurry and have the advantages of cost reduction and environmental protection.

Description

technical field [0001] The invention relates to a battery manufacturing method and system, and more specifically, to a battery negative electrode manufacturing method and system. Background technique [0002] With the rapid development of electronic products, some portable mobile devices are widely used, such as digital cameras, video cameras, etc., which have higher requirements on battery life. Currently, alkaline storage batteries are widely used in these portable mobile devices because they can be charged and discharged repeatedly. [0003] Most of the existing alkaline batteries are nickel-metal hydride batteries, and their structure is usually a strip-shaped negative electrode and a strip-shaped positive electrode separated by a diaphragm, which are packed into a metal outer cylinder after being crimped into a spiral shape. The metal outer cylinder is conductively connected to the strip-shaped negative electrode as a negative terminal, and the sealing plate insulated ...

AI Technical Summary

Problems solved by technology

The strip-shaped negative electrode made of such a structure base material has at least the following defects when it is crimped and wound: 1. The outer surface of the outermost ring formed by the tail of the negative electrode is in contact with the inner wall of the metal outer cylinder, and the outer surface of the negative electrode on the outer surface Theoretically, it is difficult for the hydrogen storage alloy slurry to recombine hydrogen and oxygen with the strip-shaped positive electrode, so the waste of the hydrogen storage alloy slurry in this section increases the cost of the battery; 2. Because the strip-shaped negative electrode and the strip-shaped positive electrode are coiled Finally, it needs to be put into the metal outer cylinder, and usually the inner diameter of the metal outer cylinder is equivalent to the diameter of the strip-shaped negative electrode and positive electrode after curling, which makes it difficult to insert and brings inconvenience to assembly; The contact between the hydrogen storage alloy slurry and the inner wall of the metal outer cylinder prevents the direct conductive contact between the base material and the metal outer cylinder, reduces the electrical conductivity, and even leads to the connection of the negative electrode and the positive electrode through the hydrogen storage alloy slurry, resulting in battery failure. Short circuit, which reduces the battery yield

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