Core structure of lithium ion battery

Abstract

The invention relates to a core structure of a lithium ion battery. In the core structure of the lithium ion battery, a core is formed by laminating and winding core monomers by means of a core septum; the core monomer is pressed by correspondingly laminating an anode sheet and a cathode sheet on two sides of the septum; and an anode ear of the anode sheet and a cathode ear of the cathode sheet are separated and positioned on two sides of the same side of the core monomer. The core septum wound with a plurality of the laminated core monomers can wind along the same direction and can also have a Z-shaped winding structure. The core is formed by laminating and winding the core monomers with the anode ears and the cathode ears by means of the core septum; the lithium battery with the core structure can effectively improve an interface structure between the core inner sheet formed by the laminated sheets and the septum, reduce the internal resistance of the core, improve the circulation performance and the rate discharge performance and can also prevent potential safety hazard triggered by misplacement of the anode sheet and the cathode sheet in the assembling process.

Description

technical field [0001] The invention relates to a cell structure of a lithium ion battery. Background technique [0002] As a high-efficiency energy carrier, liquid lithium-ion batteries are widely used in communications and electronics industries, especially in personal communication tools such as mobile phones and PDAs. In the past one or two years, with the rapid development of communication technology, mobile phone color screen technology, MMS technology, Bluetooth technology and camera technology have emerged successively, and higher requirements have been put forward for the capacity, volume, weight and electrochemical performance of liquid lithium batteries. Require. [0003] The traditional liquid lithium battery with winding cell structure can no longer meet the requirements of high capacity and high performance. For cells that require high capacity and large thickness, it is difficult to control the tightness when winding, and the winding is difficult, and because...

AI Technical Summary

Problems solved by technology

[0003] The traditional liquid lithium battery with winding cell structure can no longer meet the requirements of high capacity and high performance. For cells that require high capacity and large thickness, it is difficult to control the tightness when winding, and the winding is difficult, and because the cell The thickness is large, and the shoulders will be formed at the corners of the folds and turns. The positive and negative active materials are easy to peel off from the current collector. Internal short circuit phenomenon; moreover, the winding structure needs to overcome the tension during winding, it is difficult to continue to thicken the active material, and it is difficult to meet the requirements of high performance and high capacity

[0004] For the conventional laminated cell structure, the positive electrode sheet, negative electrode sheet, and separator are simply stacked together during the assembly process, and the interface contact effect is quite different, resulting in poor cycle performance and rate performance of the battery in the later stage. At the same time, there are also problems such as the positive and negative electrode sheets are easily misplaced during the assembly process of the battery cell, and the safety hazards caused by edge burrs and lithium dendrites

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