Upper insulating plate of cylindrical-structured lithium battery

Abstract

The invention discloses an upper insulating plate of a cylindrical-structured lithium battery. The upper insulating plate of the cylindrical-structured lithium battery comprises an upper insulating plate body, and is characterized in that the upper insulating plate body is arch-shaped, a center hole is formed in the insulating plate body, and a thin film is covered on the top of the center hole; a cylindrical baffle is downwards arranged along the circumferential direction of the center hole, and a plurality of groups of diffusion inclined hole groups are formed from the center hole to the outer rim of the upper insulating plate body in the upper insulating plate body; each group of diffusion inclined hole groups is composed of a plurality of diffusion inclined holes, and the sizes of the diffusion inclined holes increase in sequence from the center hole of the upper insulating plate body to the outer rim of the upper insulating plate body; a guide plate group which is composed of a plurality of guide plates is arranged on the bottom of the upper insulating plate body, and is further arranged on the outer side of the cylindrical baffle, and electrolyte solutions, flowing through the plurality of groups of diffusion inclined hole groups, enters the interior of the battery core of the lithium battery along the guide plate group when in use. The upper insulating plate of the cylindrical-structured lithium battery has the advantages that when electrolyte solution filling is conducted by the cylindrical-structured lithium battery of the upper insulating plate, the absorption of the electrolyte solutions is uniform, and the absorption efficiency is high, so that the absorption problem of the electrolyte solutions on the interior of the battery core of the coiling type cylindrical-structured lithium battery are well improved and solved.

Description

Technical field [0001] The invention relates to a cylindrical structure lithium battery, in particular to an upper insulating plate of a cylindrical structure lithium battery. Background technique [0002] With the development of electronic technology and digital technology, the chemical power products that supply energy for it also continue to develop. As a kind of chemical power source, lithium battery has the advantages of high specific capacity, high power discharge, high current discharge, stable electrical performance, wide range of products to adapt to the environment, and long storage life. It has been used in electronic products and digital products. Wide range of applications. [0003] At present, many types of lithium batteries adopt a cylindrical structure manufacturing process. In the internal structure, a sheet-shaped positive electrode, a sheet-shaped negative electrode, and a separator paper are superimposed to be wound into a battery core (ie, a battery). Add an ...

AI Technical Summary

Problems solved by technology

[0004] However, the existing manufacturing process of lithium batteries with a cylindrical structure generally has the problem of uneven injection and absorption of the electrolyte.

The structure of the existing cylindrical lithium battery has some factors that are unfavorable to the absorption of the electrolyte inside the battery cell: the upper insulating plate used in the current battery is a flat disc with holes, and the upper insulating plate is pressed on the battery. The upper end of the core is closely attached to the upper end of the battery core. The battery core is wound by a thinner positive electrode, negative electrode and separator paper under a certain tension. The positive electrode, negative electrode and separator paper are tightly attached. The flat disc structure with holes leads to poor fluidity of the electrolyte, which is not conducive to the electrolyte flowing from the upper end of the cell and penetrating into the inside of the cell; When the electrolyte is injected into the lower center hole, the electrolyte will quickly flow to the center hole and flow to the bottom space of the case, so that most of the electrolyte remains in the bottom of the battery case and the center hole, which will cause the upper part of the battery cell and the lower part of the cell Insufficient liquid absorption, uneven liquid absorption inside the entire cell

The above unfavorable factors will directly affect the absorption of the electrolyte inside the battery cell, which will easily lead to poor electrolyte absorption inside the battery cell, and eventually lead to poor battery performance.

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