Pole shoes of rechargeable battery and manufacturing method thereof

Abstract

The invention discloses pole shoes of rechargeable battery and a manufacturing method thereof. The pole shoe of the battery is manufactured by filling active substances in a conductive base material or coating active substance on the surface of the conductive base material; the pole shoe is divided into a head portion, a middle portion and a tail portion in the length direction; the head portion of a positive plate has a length which is 5%-10% of total length of the pole shoe and a thickness which is 50%-90% of maximum thickness of the pole shoe; the tail portion of the positive plate has a length which is 10%-20% of total length of the pole shoe and a thickness which is 50%-90% of maximum thickness of the pole shoe; the head portion of a negative plate has a length which is 5%-10% of total length of the pole shoe and a thickness which is 40%-80% of maximum thickness of the pole shoe; and the tail portion of the negative plate has a length which is 10%-40% of total length of the pole shoe and a thickness which is 40%-80% of maximum thickness of the pole shoe. Active substances of the whole pole shoe are fully participated in a chemical reaction inside the battery, thus reducing quantity of active substances, decreasing manufacturing cost and improving battery performance.

Description

technical field [0001] The invention relates to a battery pole piece and a manufacturing method of a rechargeable battery, in particular to a battery pole piece and a manufacturing method of a rechargeable battery in which positive and negative pole pieces are assembled by winding. Background technique [0002] Rechargeable batteries are a new type of power source that has been vigorously researched and developed at home and abroad in recent years, such as nickel-metal hydride batteries and lithium-ion batteries. Nowadays, it is more and more widely used in communication and digital products, electric tools, instruments and meters, electric vehicles and other fields. [0003] The battery pole piece of a traditional rechargeable battery, the thickness of the pole piece is basically the same in the entire length direction, and the density of the active material contained is also basically the same, we call it a "symmetrical electrode". This kind of "symmetrical electrode" has...

AI Technical Summary

Problems solved by technology

This kind of "symmetrical electrode" has the following problems: 1. During the winding process of this kind of pole piece, the coiled part, that is, the head of the pole piece, is prone to cracks or even breakage due to excessive curvature, which not only reduces the utilization rate of active materials, but also extremely The burrs and falling powder of the battery will cause micro-short circuit of the battery and even pose a safety hazard; 2. The negative electrode sheet of the general battery is longer than the positive electrode sheet, and the active material contained in the end of the winding, that is, the side of the tail of the electrode sheet close to the inner wall of the battery case, is due to The path to participate in the battery reaction is long and the utilization rate decreases, occupying the limited space in the battery case, especially for batteries with high energy density, although the required energy storage density is achieved, other performance of the rechargeable battery is reduced. Such as recycling performance, etc.

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