Battery winding products and disposable lithium metal batteries

Abstract

The invention discloses a battery winding product and a disposable lithium metal battery. The battery winding product comprises an assembly formed by sequentially overlapping a positive electrode sheet on an inner layer, first diaphragm paper, a negative electrode sheet, and second diaphragm paper on an outer layer, wherein the assembly is wound into a cylindrical winding body; a negative electrode lug which is parallel to the center line of the winding body and extends towards the bottom of a steel casing is connected onto the negative electrode lug; a length of distance is formed between the tail end notch part of the positive electrode sheet and the negative electrode lug positioned on the inner side of the tail end notch part and on the negative electrode sheet. The battery winding product is characterized in that a metal conductor which extends in the direction consistent with the winding direction of the winding body is integrally arranged on the negative electrode lug; the free end of the metal conductor extends towards the tail end notch part of the positive electrode sheet and exceeds a length of distance; the free end of the metal conductor is electrically connected with the negative electrode sheet. The advantages that the condition that in the traditional technology, the negative electrode sheet covered by the insulating sheet cannot participate in a chemical reaction is avoided, all materials on the negative electrode sheet can participate in the reaction, and the electrical performance index of the battery is improved, are achieved.

Description

technical field [0001] The invention relates to the field of lithium metal batteries, in particular to battery winding products and disposable lithium metal batteries. Background technique [0002] Lithium batteries are mainly used in electrical appliances such as cameras, smoke alarms, gas meters, electricity meters, and water meters that require large capacity, long storage time, and wide operating temperature range. A traditional lithium battery includes a metal case, a winding product, and a sealing body; the winding product includes a positive electrode sheet, a first separator paper, a negative electrode sheet, and a second separator paper. The effect, and then use tape to tie up the winding products to prevent the winding products from spreading. Lead out the negative pole lug from the negative pole piece to connect with the bottom of the steel shell, and draw out the positive pole lug from the positive pole piece to connect with the positive pole terminal. The oute...

AI Technical Summary

Problems solved by technology

[0007] The winding product has the following structure: 1. The negative electrode tab is attached to the negative electrode sheet, and then the insulating sheet is attached to the negative electrode tab and the negative electrode sheet. The addition of the insulating sheet will increase the thickness of the winding product, thereby increasing the lateral direction of the winding product diameter, which increases the difficulty of loading the coiled product into the steel shell

[0008] 2. There may be a loose fit between the insulating sheet (tape) and the negative electrode sheet and the negative electrode tab, or even disengagement, which may cause the negative electrode sheet to fuse

[0009] 3. The existing insulating sheet covering, although the fusing phenomenon is avoided, but at the cost of sacrificing the material of the negative electrode sheet covered by the insulating sheet, this part of the negative electrode sheet material is wasted, which affects the discharge capacity of the battery

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