阅读说明：本技术 一种电池极片辊压装置及方法 (Battery pole piece rolling device and method ) 是由 肖凯 王易玮 许瑞 胡坤 于 2019-09-27 设计创作，主要内容包括：本发明属于锂离子电池技术领域,尤其涉及一种电池极片辊压装置,包括依次传动连接的放卷组件、分切组件、辊压组件、过辊组件和收卷组件,分切组件包括分切刀轴和设置在分切刀轴上的若干分切刀,辊压组件包括上压辊和设置于上压辊下方的下压辊。本发明还涉及一种电池极片辊压方法,用斑马涂布的方式将浆料涂覆在箔材表面并烘干,得到具有若干条敷料区的单张箔材；将单张箔材分切,得到若干个单条箔材；辊压单条箔材,得到辊压后的单条箔材；对辊压后的单条箔材收卷,辊压完成。本发明提供的辊压方法,使极片在辊压前释放应力,从而解决了使用斑马涂布后箔材的打皱和断带问题,在提高了生产效率同时降低了返工材料成本。(The invention belongs to the technical field of lithium ion batteries, and particularly relates to a battery pole piece rolling device which comprises an unreeling assembly, a slitting assembly, a rolling assembly, a roller passing assembly and a reeling assembly which are sequentially connected in a transmission manner, wherein the slitting assembly comprises a slitting cutter shaft and a plurality of slitting cutters arranged on the slitting cutter shaft, and the rolling assembly comprises an upper pressing roller and a lower pressing roller arranged below the upper pressing roller. The invention also relates to a rolling method of the battery pole piece, which comprises the steps of coating the slurry on the surface of the foil in a zebra coating mode and drying to obtain a single foil with a plurality of dressing areas; cutting a single foil to obtain a plurality of single foils; rolling the single foil to obtain a rolled single foil; and rolling the rolled single foil to finish rolling. The rolling method provided by the invention enables the pole piece to release stress before rolling, thereby solving the problems of wrinkling and strip breakage of the foil after zebra coating, improving the production efficiency and reducing the cost of reworked materials.)

1. The utility model provides a battery pole piece roll-in device, its characterized in that, including the subassembly that unreels, cut subassembly, roll-in subassembly, cross roller assembly and the rolling subassembly of transmission connection in proper order, cut the subassembly including dividing the cutter axle and setting up divide the epaxial a plurality of cutters that divide of cutter, the roll-in subassembly include the compression roller and set up in the lower compression roller of going up the compression roller below.

2. The battery pole piece rolling device according to claim 1, wherein the unwinding assembly comprises an unwinding roller and an unwinding adjusting roller which are arranged in sequence.

3. The battery pole piece rolling device according to claim 1, wherein the slitting knife is a disc slitting knife, and the disc slitting knife comprises an upper disc slitting knife and a lower disc slitting knife arranged below the upper disc slitting knife.

4. The battery pole piece rolling device of claim 1, wherein the rolling assembly further comprises tension rollers disposed on both sides of the lower pressure roller.

5. The battery pole piece rolling device of claim 1, further comprising a deviation correcting assembly disposed between the slitting assembly and the rolling assembly.

6. The battery pole piece rolling device of claim 1, wherein the take-up assembly comprises a take-up slip shaft.

7. The rolling method of the battery pole piece rolling device according to any one of claims 1 to 6, characterized by comprising the following steps:

coating the slurry on the surface of a foil in a zebra coating mode and drying to obtain a single foil with a plurality of dressing areas;

cutting the single foil to obtain a plurality of single foils;

rolling the single foil to obtain a rolled single foil;

and step four, rolling the rolled single foil to finish rolling.

8. The method of claim 7, wherein in step one, void foil regions are attached to both sides of the dressing region.

9. The method of claim 8, wherein in step two, the single foil is slit, in particular along a section of the blank foil between any two dressing sections.

10. The method of claim 9, wherein after rolling is complete, the rolled single foil is die cut to specification.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a battery pole piece rolling device and method.

Background

The lithium ion battery is one of the energy sources of new energy vehicles, the performance requirements of the new energy vehicles on the lithium ion battery are greatly different from those of consumer batteries, the new energy vehicles are generally power batteries, and the existing power batteries generally adopt the lithium ion batteries with multi-lug and full-lug structures, so that the lithium ion battery not only has the performance characteristic of lamination, but also has the advantage of high-efficiency winding.

The production process of the traditional lithium ion battery pole piece generally comprises the working procedures of coating, rolling, slitting and the like. In the production process of the power battery, in order to improve the production efficiency, the coating process adopts zebra coating. The zebra coating is to coat slurry on a foil at intervals, areas covered by the slurry are called dressing areas, a battery pole piece is formed after rolling and cutting, areas not covered by the slurry are called empty foil areas, a battery pole lug is formed after rolling and cutting, and patterns similar to zebra stripes are formed due to the fact that a plurality of dressing areas and the empty foil areas are arranged at intervals, so that the coating method is called zebra coating. Adopt zebra coating can produce many pole pieces simultaneously, however, because zebra coating can lead to a plurality of dressing districts and empty foil district appearing simultaneously on a foil, because the thickness and the material composition in dressing district and empty foil district are different, when receiving the exogenic action in the roll-in process, the stress that produces in a plurality of dressing districts and empty foil district is also different, just so makes the foil take place to crumple easily and the broken tape, has not only reduced production efficiency and has leaded to the material cost to rise simultaneously.

Disclosure of Invention

One of the objects of the present invention is: the utility model provides a battery pole piece roll-in device, the device can solve the foil after zebra coating and produce the problem of crumpling and breaking the area when the roll-in.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a battery pole piece roll-in device, includes that the transmission connects in proper order unreels the subassembly, cuts subassembly, roll-in subassembly, crosses roller assembly and rolling assembly, it is in including dividing the cutter axle and setting to cut the epaxial a plurality of minutes cutters of cutter, the roll-in subassembly include the compression roller and set up in go up the lower compression roller of compression roller below.

As an improvement of the battery pole piece rolling device, the unwinding assembly comprises an unwinding roller and an unwinding adjusting roller which are sequentially arranged. The unwinding adjusting roller can swing left and right relative to the central line, the position is adjustable, and the accuracy of the unwinding position of the coated pole piece is guaranteed.

As an improvement of the battery pole piece rolling device, the slitting knife is a disc slitting knife which comprises an upper disc slitting knife and a lower disc slitting knife arranged below the upper disc slitting knife. The disk slitting knife cuts the coated pole pieces by using a roller shear principle, the cut pole pieces are free from wrinkles and powder shedding, the slitting size precision is high, and burrs on the edges of the pole pieces are small.

As an improvement of the battery pole piece rolling device, the rolling assembly further comprises tension rollers arranged on two sides of the lower pressing roller. The tension roller can adjust the tension of the pole piece before and after rolling, control the tension range and avoid the occurrence of wrinkles and broken belts.

As an improvement of the battery pole piece rolling device, the battery pole piece rolling device further comprises a deviation rectifying assembly, and the deviation rectifying assembly is arranged between the slitting assembly and the rolling assembly. The deviation rectifying assembly is used for adjusting the tension of the cut pole pieces, and side edge errors can not occur before the pole pieces enter the rolling assembly.

As an improvement of the battery pole piece rolling device, the winding assembly comprises a winding slip shaft. The common winding shaft is used for winding the rolled pole pieces, and after the pole piece coil materials are continuously wound, the diameter of the pole piece coil materials generates larger accumulated errors, so that the winding speed difference and the tension difference of the pole piece coil materials are larger. The tightness of the coiled material of the pole piece is different, the end faces are uneven, and the pole piece is damaged and scrapped due to overlarge tension of a serious person. The winding slip shaft consists of a plurality of slip rings, the slip rings are controlled to slip at a certain slip torque value, and the slip amount just compensates the generated speed difference, so that the tension of each pole piece coil material is accurately controlled, the constant tension coiling is realized, and the coiling quality is ensured.

Another object of the present invention is to provide a rolling method of the device as described in the foregoing specification, comprising the steps of:

coating the slurry on the surface of a foil in a zebra coating mode and drying to obtain a single foil with a plurality of dressing areas;

cutting the single foil to obtain a plurality of single foils;

rolling the single foil to obtain a rolled single foil;

and step four, rolling the rolled single foil to finish rolling.

In a modification of the rolling method of the present invention, in step one, the dressing region is connected with a blank foil region on both sides.

As an improvement of the rolling method according to the present invention, in step two, the single foil is slit, specifically along the empty foil section between any two dressing sections.

As an improvement of the rolling method, after the rolling is finished, the single foil after the rolling is subjected to die cutting according to the specification.

The beneficial effects of the invention include but are not limited to: the battery pole piece rolling device provided by the invention not only omits a winding assembly of a conventional rolling machine, but also omits an unwinding assembly of a conventional splitting machine, and combines the two operations of pole piece slitting and rolling together, thereby shortening the material transfer time and improving the production efficiency. According to the rolling method provided by the invention, a single sheet of zebra-coated foil is continuously cut into a plurality of single foils with dressing areas and empty foil areas, and then the plurality of single foils are rolled, so that the stress of a pole piece is released before rolling, the problems of crumpling and strip breakage of the zebra-coated foil are solved, the production efficiency is improved, and the rework material cost is reduced.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus of the present invention.

FIG. 2 is a top view of the apparatus of the present invention.

Fig. 3 is a schematic view of the structure of a single foil according to the present invention.

In the figure: 1-unreeling component, 2-slitting component, 3-rolling component, 4-passing roller component, 5-reeling component, 6-single foil, 7-single foil, 21-upper disc slitting knife, 22-lower disc slitting knife, 31-upper press roller, 32-lower press roller, 51-reeling slip shaft, 61-dressing area and 62-empty foil area.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.