Multi-tab cylindrical lithium ion battery

Abstract

The invention discloses a multi-tab cylindrical lithium ion battery, which comprises: a shell, a battery cell, a positive electrode assembly and a negative electrode assembly, the positive electrode assembly comprises a positive electrode insulating disc, a positive electrode collector plate and a battery cover plate, and a plurality of groups of positive electrode tabs sequentially penetrate through a first positive electrode tab through hole and a second positive electrode tab through hole and then are welded on the positive electrode collector plate, an extension handle of the positive electrode collector plate is bent and then welded on the battery cover plate, the negative electrode assembly comprises a negative electrode insulating sheet and a negative electrode collector plate, and a plurality of groups of negative electrode tabs sequentially penetrate through a first negative electrode tab through hole and a second negative electrode tab through hole and then are welded on the negative electrode collector plate. The invention also discloses another implementation mode of the multi-tab cylindrical lithium ion battery. The lithium ion battery disclosed by the invention is compact in structure, high in energy density, strong in overcurrent capability and suitable for high-rate charge and discharge.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a multi-tab cylindrical lithium ion battery. Background technique [0002] As a green and environmentally friendly new energy source, lithium-ion batteries have the advantages of good reliability, high safety, small size, and light weight. They have been widely used in digital products, electric vehicles, military products and other fields. [0003] The current cylindrical lithium-ion battery causes battery heating due to the lack of tabs. To increase the battery capacity, the diameter increases, and the heating is more serious. Therefore, it is necessary to increase the number of tabs while increasing the diameter to reduce the internal resistance of the battery and reduce heat generation. In the past, the internal resistance can be reduced by using the full tab method, but the battery process includes mechanically or ultrasonically flattening the tabs protrudin...

AI Technical Summary

Problems solved by technology

In the past, the internal resistance can be reduced by using the full tab method, but this battery process includes mechanically or ultrasonically flattening the tabs protruding from the end face, placing a current collector on the flat flat surface, and performing transmission welding with laser. There are four deficiencies in the soft-flat method. One: it needs to occupy a few millimeters of space at each end, reducing the use of space inside the battery; Laser welding is easy to damage the winding core and cause short circuit; Fourth: Welding reliability cannot be confirmed and inspected for welding quality because the solder joint is on the reverse side of the solder sheet

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