Multi-roll-core lithium ion battery and battery pack

Abstract

The invention provides a multi-roll-core lithium ion battery which comprises a shell and a pole core group arranged in the shell, the pole core group comprises N cylindrical roll cores, and N is a positive integer and is greater than or equal to 2. According to the pole core group in the multi-roll-core lithium ion battery provided by the invention, if a multi-roll-core parallel connection mode isadopted, the internal resistance of the battery can be reduced, the rate capability is improved, and if a series connection mode is adopted, the voltage and the capacity of the battery can be improved. The invention further provides a battery pack which comprises a shell and a battery array arranged in the shell, the battery array comprises a plurality of rows of battery packs, and each row of battery packs is formed by arranging and coupling the multi-roll-core lithium ion batteries through side surfaces. The single batteries are mutually supported and can be fixed and protected, and the shells of the single batteries are coated with frosted insulating materials, so that the adjacent shells can generate friction force in the direction perpendicular to the chassis, the single batteries are prevented from being mutually dislocated to damage the battery array, and a stabilizing effect is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a multi-core lithium ion battery and a battery pack. Background technique [0002] At present, commercial power batteries mainly include square batteries, pouch batteries and cylindrical batteries. Square batteries and pouch batteries are mainly wound and laminated. The manufacturing process of laminated cells is complicated, the production efficiency is low, and the yield is low, which is not suitable for large-scale production. The operation of wound cells is simple and easy for automated production. However, the core has a certain curvature during the assembly process. After entering the shell, the core and the core and between the core and the shell cannot be completely fitted, and there will be more gaps. After the liquid is injected, there will be additional The electrolyte is filled in these gaps, and the free electrolyte not only does not contribute to the capa...

AI Technical Summary

Problems solved by technology

Among them, the frame and structural parts of the single-unit module often have certain mechanical strength, which can support, fix and protect the single-cell battery. However, there are many installation structures for the module and battery pack, which will not only cause The cost increases, the overall weight of the battery pack increases, and the installation structure takes up more space, resulting in lower overall capacity and lower energy density

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