Power soft roll lithium ion battery of multi-roll core structure

Abstract

The invention discloses a power soft roll lithium ion battery of a multi-roll core structure. According to the power soft roll lithium ion battery, a positive plate, a diaphragm and a negative plate are coiled to form a single naked core, a plurality of naked cores are overlapped together in a parallel connection manner, an aluminum strip is welded with an aluminum lug, and a copper strip is welded with a nickel-plated lug or a nickel lug. Multiple naked cores are overlapped together in the parallel connection manner, and the aluminum strip and the copper strip of the naked core formed by the positive plate, the negative plate and the diaphragm in the coiled manner are arranged on one same side of the naked core. Compared with the prior art, the power soft roll lithium ion battery has the advantages that firstly, the large-current charge / discharge property of a polymer lithium battery of a coiled structure can be improved; secondly, the characteristics of simple process and high production efficiency of the coiled lithium battery are maintained; thirdly, precious nickel resources can be saved; fourthly, the service lives of a welding head and a cutter can be prolonged, the cost can be lowered, and the welding stability and consistency can be ensured.

Description

technical field [0001] The invention relates to a soft-packed polymer lithium ion battery, in particular to a power soft-packed ion battery with a multi-roll core structure. Background technique [0002] In recent years, due to the advantages of high working voltage, high energy density, no memory effect, long cycle life and no pollution, lithium-ion batteries have continuously expanded their application fields, and at the same time, their performance requirements in various aspects have also been continuously improved. With the application of lithium batteries in daily life, people gradually understand and affirm the superiority of lithium batteries over other system batteries, and the requirements and expectations for lithium batteries have also increased significantly. The original capacity-type lithium batteries have been widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras. Now the power type lithium battery fluid wi...

AI Technical Summary

Problems solved by technology

[0003] As we all know, the common method of making power-type polymer lithium battery bare cells is stacked: that is, the die-cut positive and negative electrodes and separators are laminated together, which is characterized by the small internal resistance of the battery and is suitable for high-current discharge. The disadvantage is that the lamination process is complicated and the lamination efficiency is very low

If you want to increase the production capacity, you need to purchase a large number of lamination equipment. This structure limits the increase in the production capacity of polymer lithium batteries. On the other hand, the current technical solution uses nickel strips as the negative tab. First, nickel is a rare and precious metal, and the production cost is relatively high. The second is that the conductivity of nickel is also inferior to that of copper; the third is that the Mohs hardness of nickel is also higher than that of copper tabs, and the welding head and tab cutter of ultrasonic welding equipment are greatly worn during production.

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