Cell manufacturing method and lithium ion battery

Abstract

The invention provides a battery cell manufacturing method and a lithium ion battery. The manufacturing method of a battery cell comprises the following steps: coating pole piece foils in the mode ofan even number of coating, and reserving a blank foil between two symmetrical coatings for forming a tab lead; respectively carrying out die cutting on a positive pole roll and a negative pole roll tofinish pole piece chamfering and tab forming operations, wherein the positive pole roll and the negative pole roll are respectively formed by rolling the coated pole piece foils; slitting the positive pole roll and the negative pole roll after a tab is formed to form a plurality of positive pole pieces and negative pole pieces, and placing the positive pole pieces and the negative pole pieces ona diaphragm in a staggered manner, wherein the diaphragm comprises an even number of diaphragm belts which are arranged in parallel, and the coatings coincide with the diaphragm belts; superposing thediaphragm belts on which the positive pole pieces and the negative pole pieces are placed with a protective film, and performing thermal compounding operation to form pole piece diaphragm composite belts; and winding the parallel pole piece diaphragm composite belts to form a symmetrical pole piece diaphragm winding battery cell.

Description

technical field [0001] The present application relates to the field of lithium-ion battery manufacturing technology, in particular to a method for manufacturing a battery cell and a lithium-ion battery including a wound battery cell made by the method. Background technique [0002] In recent years, the popularity of new energy vehicles has continued to rise, and electric vehicles are more environmentally friendly and economical than fuel vehicles, so they have become the only path for automobile development. Moreover, various countries have formulated different ambitious goals for the phase-out of fuel vehicles and the full electrification of vehicles, and have continuously introduced various high subsidies to encourage the development of electric vehicles. However, with the in-depth research on lithium batteries for new energy vehicles, after several years of development, researchers have found that there are still some problems in the development of electric vehicles, and ...

AI Technical Summary

Problems solved by technology

However, there are still some problems that need to be solved urgently in lamination. Among them, how to improve the working efficiency of lamination to the same or higher level as that of the winding process and how to improve the accuracy of the lamination is the difference between the lamination process and the winding process. The most urgent problem to solve

Moreover, with the continuous upgrading of electric vehicle power batteries, larger-capacity lithium-ion batteries are popular. For large-capacity lithium-ion batteries, the conventional winding and laminated electrode group structures are not the best choice.

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