Coiled primary lithium battery cathode structure

Abstract

The invention discloses a coiled primary lithium battery cathode structure and relates to the technical field of primary lithium batteries. The coiled primary lithium battery cathode structure comprises a cathode tab and lithium strips and is characterized by further comprising a lithium bar, wherein the width of the lithium bar is N times that of the cathode tab; N is greater than 4 and smaller than 5; the lithium bar, the cathode tab and the lithium strips are successively stacked and then coiled to form a primary lithium battery cathode structure; in the structure, the lithium strips are located on the outer side; the lithium bar is as thick as the cathode tab. When the battery discharges, the lithium stripes are arranged on two sides of the cathode tab; the thickness of the metal lithium is doubled; therefore, when the lithium strips in other positions are consumed, thinned and almost broken, the lithium strips of the cathode tab still have 100% redundancy, so that the lithium strips have certain thickness; the current collection effect can be effectively realized, so that the breakage of the crimping edges of the cathode tab and the lithium strips can be avoided; due to the adoption of a method for thickening the lithium strips of the cathode tab, the influence on the discharge process is avoided; the discharge reaction is more uniform; the breakage of the lithium strips caused by local excessive reaction is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium primary batteries, in particular to a wound-type lithium primary battery negative electrode structure. Background technique [0002] A lithium primary battery with a winding structure, its cell structure is composed of a layer of positive electrode, a layer of separator, and a layer of negative electrode (metal lithium strip) stacked and wound, see figure 1 . During the discharge process of the battery, metal lithium is oxidized to lithium ions and reacts with the positive electrode to be consumed as a current collector and at the same time as the negative electrode. Therefore, in the later stage of discharge, the lithium ribbon becomes thinner due to consumption and is prone to breakage, resulting in interruption of current collection, resulting in the inability of the positive electrode capacity to be fully utilized, and usually occurs first at the crimping edge of the negative tab and the lith...

AI Technical Summary

Problems solved by technology

The negative electrode structure of the winding lithium primary battery solves the problem that the capacity of the positive electrode cannot be fully utilized due to the breakage of the lithium ribbon during the discharge process.

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