Device for automatically winding wound laminated battery

Abstract

The invention relates to a device for automatically winding a wound laminated battery. The device comprises a tension mechanism, a feeding mechanism, a sucking cutting mechanism, a turnover mechanism, a pressurizing mechanism, a jacking mechanism and a conveying mechanism, wherein the tension mechanism is used for keeping certain tension for a material strap; the feeding mechanism is used for clamping the material strap or a wingding core and used for achieving intermittent feeding; the sucking cutting mechanism is sued for sucking the material strap and cutting the material strap after winding is competed so as to dissociate the material strap from the winding core; the turnover mechanism is used for turning over the material strap or the winding core; the pressurizing mechanism is used for pressurizing the surface of the winding core so as to tightly overlapping single electrode components; the jacking mechanism is used for jacking out the winding core from a working station after winding is completed; the conveying mechanism is used for conveying the jacked winding core. By adopting the device, intermittent feeding and automatic turnover of the material strap are achieved, the tension of diaphragms inside the winding core is uniform, moreover the surface of the winding core can be pressurized once when winding is performed each time, the single electrode components can be overlapped relatively tightly, good performance can be achieved even after long-time use, and the production efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of wound laminated batteries, in particular to a device for automatic winding 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 winding assembly is as ...

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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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