阅读说明：本技术 一种锂电池极片多层涂布的辅助装置 (Auxiliary device for multilayer coating of lithium battery pole pieces ) 是由 崔大祥 焦靖华 张芳 葛美英 王亚坤 卢玉英 张放为 王金 于 2021-07-20 设计创作，主要内容包括：本发明涉及一种锂电池极片多层涂布的辅助装置,包括多面涂布器的涂布刮刀、上层贴片模具和下层贴片模具,其中,上贴片模具和下贴片模具是由高硬度磁性橡胶材料制成的磁性薄片,可依次紧密吸附于多面涂布器的涂布刮刀上且相互紧密吸附,上贴片模具和下贴片模具的宽度相差0.6mm～1mm。本发明的使用方法是：在电池极片下涂层涂布时,将上、下贴片模具依次吸附于多面涂布器/涂布刮刀上,在电池极片上涂层涂布时,仅将上层贴片模具吸附于多面涂布器的涂布刮刀上。本发明辅助装置可使所涂布的电池极片结构的上涂层与下涂层减少相互干扰且具有宽度差值,上涂层的边缘逐渐削薄,从而解决了双层涂布鼓边的问题。(The invention relates to an auxiliary device for multilayer coating of a lithium battery pole piece, which comprises a coating scraper of a multi-surface coater, an upper-layer chip die and a lower-layer chip die, wherein the upper chip die and the lower chip die are magnetic sheets made of high-hardness magnetic rubber materials, the magnetic sheets can be sequentially and tightly adsorbed on the coating scraper of the multi-surface coater and mutually and tightly adsorbed, and the width difference between the upper chip die and the lower chip die is 0.6-1 mm. The using method of the invention is as follows: when coating the lower coating of the battery pole piece, the upper and lower patch dies are sequentially adsorbed on the multi-surface coater/coating scraper, and when coating the upper coating of the battery pole piece, only the upper patch die is adsorbed on the coating scraper of the multi-surface coater. The auxiliary device can reduce the mutual interference between the upper coating and the lower coating of the coated battery pole piece structure, has a width difference value, and gradually thins the edge of the upper coating, thereby solving the problem of double-layer coating edge bulging.)

1. The utility model provides an auxiliary device of lithium-ion battery pole piece multilayer coating which characterized in that: including coating scraper (1), upper paster mould (2) and lower floor's paster mould (3) of multiaspect coating, upper paster mould (2) and lower floor's paster mould (3) be the magnetic sheet who makes by high rigidity magnetic rubber material, can closely adsorb on coating scraper (1) in proper order, also can closely adsorb each other.

2. The auxiliary device for multilayer coating of the lithium battery pole piece according to claim 1, wherein the width difference between the upper and lower layer patch molds is 0.6 mm-1 mm.

3. The auxiliary device for the multilayer coating of the lithium battery pole piece according to the claim 1 or 2, characterized in that more than one patch die is added between the upper patch die (2) and the lower patch die (3) according to the coating thickness requirement.

4. The use method of the auxiliary device for the multilayer coating of the lithium battery pole piece is characterized in that an upper layer patch die (2) and a lower layer patch die (3) are sequentially adsorbed on a coating scraper (1) when a lower coating of the battery pole piece is coated; when coating is carried out on the battery pole piece, only the upper layer sheet sticking mould (2) is adsorbed on a coating scraper.

Technical Field

The invention relates to the technical field of preparation of lithium ion battery pole pieces, in particular to an auxiliary device for multilayer coating of a lithium ion battery pole piece.

Background

In the manufacturing process of the lithium ion battery, an extrusion coating machine is generally adopted, a layer of flowable slurry is coated on the surface of a current collector, a pole piece is prepared after drying, and then the battery is formed through pressing, cutting and assembling.

The thick pole piece has continuous gradient distribution porosity, high energy density and good electrochemical performance. Chinese patent CN 201210191956.5 discloses a method for preparing a lithium ion secondary battery pole piece, in which the porosity of the membrane is gradually increased from the surface close to the current collector to the surface far from the current collector, the capacity of the method is normally exerted, the rate capability is obviously improved, the lithium precipitation condition is obviously improved, and the cycle stability is also obviously improved. As can be seen, the research value in multilayer coating is becoming increasingly prominent.

Chinese patent CN212277235U discloses a multi-layer coated pole piece structure, which sets the width difference between the upper coating and the lower coating, and the edge of the upper coating is gradually thinned, thereby solving the problem of double-layer coating drum edge.

Disclosure of Invention

The invention aims to provide an auxiliary device for multilayer coating, aiming at the problems of inconvenience in actual operation, easiness in edge warping and edge bulging and the like of multilayer coating of a lithium ion battery pole piece.

The object of the invention is achieved by the following solution: the utility model provides an auxiliary device of lithium-ion battery pole piece multilayer coating, includes the coating scraper of multiaspect coater, upper strata paster mould and lower floor's paster mould, upper and lower paster mould be the magnetic sheet of making by high rigidity magnetic rubber material, can closely adsorb on multiaspect coating scraper in proper order, also can closely adsorb each other.

The device can reduce the mutual interference between the upper coating and the lower coating of the coated pole piece structure and has a width difference, and the edge of the upper coating is gradually thinned, thereby solving the problem of double-layer coating drum edge. In the invention, the upper and lower film sticking dies are made of magnetic sheets made of high-hardness magnetic rubber materials, are customized according to the size of the coating scraper of the matched multi-surface coater, and can be sequentially and tightly adsorbed on the coating scraper of the multi-surface coater or mutually and tightly adsorbed.

On the basis of the scheme, the difference between the widths of the upper and lower patch molds is 0.6 mm-1 mm. The width difference of upper and lower paster is 0.6mm ~1mm, can make the upper coat and the lower coating of the pole piece structure of coating reduce mutual interference and have the width difference, and the edge of upper coat is sold thinly gradually to the problem on double-deck coating drum limit has been solved.

The number of the paster molds is not limited to two layers, and the paster molds can be customized according to actual needs and expanded to any number which can be realized by actual thickness and process level.

The invention provides a using method of the device, which comprises the following steps: when the lower coating of the battery pole piece is coated, the upper and lower film sticking dies can be sequentially adsorbed on a coating scraper; when coating is carried out on the battery pole piece, only the upper layer sheet sticking mould can be adsorbed on the coating scraper.

The invention has the advantages that:

1. the invention has simple structure and convenient assembly and use;

2. the invention can effectively assist the multi-layer coating of the battery pole piece and solve the problem of edge bulging of the multi-layer coating;

3. the invention can expand the layer number according to the actual requirement, customize the patch die and realize multilayer coating.

Drawings

FIG. 1 is a front view of the device;

FIG. 2 is a schematic cross-sectional view taken along section A;

the reference numbers in the figures illustrate:

1-coating blade;

2-upper layer patch mould;

and 3, a lower layer patch die.

Detailed Description

Example 1:

the utility model provides an auxiliary device of lithium-ion battery pole piece multilayer coating, as shown in fig. 1 and fig. 2, includes coating scraper 1, upper strata paster mould 2 and lower floor's paster mould 3 of multiaspect coating, upper strata paster mould 2 and lower floor's paster mould 3 be the magnetic sheet who is made by high rigidity magnetic rubber material, can closely adsorb on coating scraper 1 in proper order, also can closely adsorb each other. The width difference between the upper and lower layer patch moulds 1 and 2 is 0.6 mm-1 mm.

The method comprises the following steps:

a) a current collector foil (copper foil or aluminum foil) is laid on the coating machine, the upper and lower layer paster dies 2 and 3 and the foil are wiped clean by alcohol, and the upper and lower layer paster dies and the foil are sequentially adsorbed on a coating scraper 1 of a multi-surface coater;

b) coating the lower coating slurry in a double-layer patch mode, and sequentially adsorbing the upper and lower patch molds 2 and 3 on a coating scraper 1;

c) cleaning and removing the lower-layer patch die 3, only adsorbing the upper-layer patch die 2 on a coating scraper 1, starting coating the upper-layer slurry at the coating initial position of the lower coating, and reserving left and right reserved spaces relative to the lower coating in the width direction as equal as possible, for example, if the widths of the upper and lower patches are different by 0.6mm, reserving 0.3mm on the left and right sides respectively;

d) and finishing coating, closing the equipment, cleaning the device, drying the pole piece, and tidying the edges of the multilayer coating without edge bulging.

Comparative example 1:

a) spreading a current collector foil (copper foil or aluminum foil) on the coating machine, wiping the multi-surface coating device/coating scraper and the foil clean by alcohol, and adjusting the height required by coating of the lower-layer coating;

b) coating the lower layer slurry under the condition that no upper layer and lower layer patch moulds are added;

c) cleaning the multi-surface coater/coating blade 1, adjusting the height required for coating the upper coating slurry, and starting coating the upper coating slurry at the lower coating starting position;

d) and finishing coating, closing the equipment, cleaning the device, drying the pole piece, gradually widening the multilayer coating edge, and causing the edge bulging problem on one side.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.