High-rate and safe cylindrical lithium ion battery ad manufacturing method thereof

Abstract

The invention discloses a high-rate and safe cylindrical lithium ion battery. The battery comprises a positive pole piece and a negative pole piece, wherein a ceramic diaphragm is arranged between thepositive pole piece and the negative pole piece, a positive coating is arranged on a surface of the positive pole piece, a negative coating is arranged on a surface of the negative pole piece, an aluminum foil is arranged on the positive pole piece, a copper foil is arranged on the negative pole piece, high-temperature insulating adhesive tapes are arranged on the outer side surfaces of the positive coating and the negative coating, and polymer adhesives are arranged on surfaces of high-temperature insulating adhesive tapes. The battery is advantaged in that gathered multiple tabs are weldedwith a planar metal sheet current collector to form a full tab, so internal resistance is greatly reduced, and the high-current charging and discharging capacity of the battery is improved. The dry battery cell is subjected to electrolyte injection, packaging, formation and capacity grading, so the high-rate and safe lithium ion battery is assembled, the manufacturing process is simple and convenient, and the lithium ion battery is particularly suitable for new energy application fields of electric vehicles, large-scale energy storage and the like.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a high-rate and safe cylindrical lithium-ion battery and a manufacturing method thereof. Background technique [0002] Lithium-ion batteries have been widely used due to their outstanding features such as high specific energy, high voltage platform, long cycle life, no memory effect, and little harm to the environment. With the increasing demand for green energy, environmental protection, energy storage and utilization, lithium-ion batteries have become a bottleneck in the development of new energy. [0003] The current process for large-scale manufacturing of lithium-ion batteries mainly includes the following processes: preparation of electrode slurry, coating and drying, sheet production, electrode sheet baking, positive and negative electrode sheets and separators combined winding or lamination to form cells , Cell baking liquid injection, formation and volume se...

AI Technical Summary

Problems solved by technology

Among them, the pole piece rolling, cutting and slitting steps involved in the production process inevitably have burrs and bring serious battery safety hazards, although some additional measures such as burr monitoring and dust removal can be taken. The method tries to solve these problems, but it still cannot completely eliminate the burrs and hard-strength active material particles remaining after cutting the pole pieces and slitting. The separator is pierced and the short circuit in the battery

Especially in the manufacture of large-capacity power and energy storage batteries, with the substantial increase in the capacity of single cells, the perimeter of the punched edge of the positive and negative plates is significantly lengthened, resulting in burrs and powder loss during the production and assembly process The chance of intensifying the chance of causing internal short circuit of the battery doubles, the product qualification rate is low, and the battery is very easy to cause fire or even explosion due to internal short circuit during the working process, so it poses a great safety hazard to the surrounding environment in which it is used.

At the same time, most domestic cylindrical lithium-ion batteries use unipolar or bipolar lugs to draw current, resulting in excessive internal resistance of the battery and poor high-current charge and discharge capabilities. lead to safety hazards

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