Novel winding type lithium ionic cell and manufacturing method thereof

Abstract

The invention discloses a novel wound lithium-ion battery with high capacity and high power performance and a manufacturing method thereof. In the technical proposal of the novel wound lithium-ion battery, an electrode group is arranged in a shell to form an electrode group winding device; the electrode group comprises a cathode plate, a diaphragm and an anode plate, which are stacked in sequence; the diaphragm covers the cathode plate from the bottom thereof; and the end surfaces of the anode and the cathode of the electrode group are respectively welded with an anode ear and a cathode ear. The manufacturing method of the novel wound lithium-ion battery comprises the following steps; at first, the cathode plate, the diaphragm and the anode plate are sequentially stacked to form the electrode group; the metal foil bodies preset on the anode plate and the cathode plate being stacked are arranged in the opposite directions; the anode plate and the cathode plate are stacked in sequence and wound to form a circular electrode group; then the anode ear and the cathode ear are respectively welded on the upper end surface and the lower end surface of the electrode group; and finally the assembly is completed. The invention adopts the novel winding method of 'first stacking, then winding' when the electrode group is wound, thereby realizing high capacity and high power performance.

Description

Technical field [0001] The present invention relates to the field of batteries, and more specifically, to a new type of winding lithium ion battery and a manufacturing method thereof. Background technique [0002] Compared with other types of batteries such as lead-acid and cadmium-nickel batteries, lithium-ion batteries have the advantages of large specific capacity, high working voltage, fast charging speed, wide working temperature range, long cycle life, small size and light weight. At present, it has been widely used in mobile phones, notebook computers, power tools and other fields, and its application range is becoming more and more extensive. [0003] With the expansion of the use range of lithium-ion batteries, we are accustomed to refer to the chemical power supply used in power supply systems as power batteries. For example, when used in power tools, electric vehicles and other fields, power batteries are used in complex conditions and require more batteries. High capa...

AI Technical Summary

Problems solved by technology

[0004] At present, most power batteries use relatively mature technical conditions and a cylindrical cell structure with a high level of automation, but the cylindrical battery cell has the defects of low capacity and low power performance. The current cylindrical lithium-ion battery cannot Fully meet the technical requirements of the power battery

Traditional cylindrical batteries adopt a single-piece positive and negative winding method. In order to increas

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