A manufacturing device for a wound-type laminated battery cell electrode assembly

Abstract

The invention relates to a manufacturing device for a single electrode assembly of a wound-type laminated battery, comprising two devices for extracting a pole piece or a single electrode assembly from a material supply box and bonding it to an adhesive separator coated on both sides. Side feeding mechanism, tension mechanism for maintaining a certain tension and intermittent movement of the double-sided glued adhesive diaphragm, heat and pressure mechanism for applying heat and force load to the surface of the pole piece or single electrode assembly , and a cutting mechanism for cutting off the double-sided adhesive adhesive separator to separate it from the newly formed monolithic electrode assembly after the hot pressing is completed. The invention can realize precise bonding and connection hot pressing of pole pieces or single electrode components, and greatly improves battery quality.

Description

technical field [0001] The invention relates to the technical field of wound laminated batteries, in particular to a manufacturing device for a single electrode assembly of wound laminated batteries. Background technique [0002] With the intensification of the oil crisis and environmental pollution, people gradually turn their attention to the field of clean energy. Lithium secondary batteries with high working voltage, high energy density, long cycle life, environmental protection and pollution-free have attracted much attention and have been widely used in computers. Different fields such as mobile phones, electric vehicles, etc. are gradually occupying a dominant position in life. [0003] The secondary battery is mainly composed of an electrode assembly with a structure of a positive electrode sheet, a separator, and a negative electrode sheet. The electrode assembly can be divided into a wound-type assembly and a stacked-sheet assembly. The preparation method of the w...

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Problems solved by technology

[0004] However, the conventional electrode assembly has the following problems: the wound electrode assembly, since the cross section of the electrode assembly is circular or elliptical, the expansion and contraction of the electrodes may cause uneven gaps between the electrodes during charging and discharging of the battery, As a result, the performance of the battery is degraded; although the wound electrode assembly is suitable for cylindrical batteries, when it is applied to angular or pouch batteries, it will appear that the pole piece is easy to break at the bend, the electrode active material falls off, and the space utilization Low efficiency and other defects; the tension between the front and side of the electrode assembly is inconsistent, which will lead to uneven internal reactions; at the same time, there are also disadvantages such as long pole pieces, large internal resistance of the battery, which are not conducive to high-rate charge and discharge, and low specific power.

[0006] However, there are two significant defects in the above-mentioned winding method: 1. The winding clamp has two upper and lower splints, and the surface of the single electrode assembly and the diaphragm are in contact with each splint and the bottom respectively. The friction coefficient is different, and the friction force on the upper and lower surfaces of each splint is different during the extraction process, resulting in uneven force on the winding core and deformation; when the winding tension of the material tape is too high, it will be difficult to pull out the splint The phenomenon

2. Because the tension of the material tape is not easy to control, the cross-section of the core produced by the above winding method tends to be elliptical, resulting in large gaps between the single electrode components and loose contact

Both of the above significant defects will lead to poor performance of the final battery

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