CN214637744U

CN214637744U - Diaphragm coating equipment

Info

Publication number: CN214637744U
Application number: CN202120215205.7U
Authority: CN
Inventors: 刘科; 李正林; 陈朝晖; 盛夏
Original assignee: Jiangsu Housheng New Energy Technology Co Ltd
Current assignee: Jiangsu Housheng New Energy Technology Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-11-09
Anticipated expiration: 2031-01-26

Abstract

The application discloses diaphragm coating equipment, which comprises a roller body, wherein the surface of the roller body comprises a slurry transfer area and a light plate area which are arranged at intervals, and the slurry transfer area and the light plate area are distributed along the circumferential direction of the roller body; the roller body is embedded in the slurry box through the diaphragm contact port, so that the slurry box is airtight. The utility model provides a roll body surface includes interval arrangement's thick liquids transfer district and light version district, thick liquids transfer district can carry thick liquids when the roll body is rotatory, and light version district can not carry thick liquids, so can form interval distribution's thick liquids coating on the diaphragm surface, the regional ventilative increment that does not shift sizing agent on the diaphragm is zero, reduce the ventilative increment of diaphragm on the whole, thereby reduce the internal resistance of lithium cell, and because there is the region that does not shift sizing agent on the diaphragm, improve the infiltration nature of electrolyte, can reduce 30% to 50% thick liquids quantity simultaneously, and the cost is saved.

Description

Diaphragm coating equipment

Technical Field

The application relates to the technical field of lithium battery processing, in particular to a diaphragm coating device.

Background

The separator is an important structure in a lithium battery, and has a function of separating a positive electrode and a negative electrode of the lithium battery to prevent short circuit due to contact between the two electrodes and allowing electrolyte ions to pass therethrough. The performance of the separator determines the interface structure, internal resistance, etc. of the lithium battery.

The diaphragm and the battery pole piece are bonded by adhesive, and the main function of the adhesive is to bond and retain active materials. At present, when the surface of the diaphragm is coated with the adhesive, the surface is coated by reverse coating of a gravure roller, the coating mode is uniform in coating, and the adhesive is flatly covered on the surface of the diaphragm. Firstly, the ventilation increment of the coated diaphragm is 30-150 s/100ml, so that the internal resistance of the lithium battery is increased, and the wettability of an electrolyte is poor after the adhesive is coated; secondly, the amount of adhesive used is large and the cost is high.

Therefore, how to solve the above technical problems should be a great concern to those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a separator coating device, so that the ventilation increment of a separator coated with an adhesive is reduced, the internal resistance of a lithium battery is reduced, the wettability of electrolyte is improved, and the using amount of slurry is reduced.

In order to solve the above technical problem, the present application provides a separator coating apparatus, including:

the surface of the roller body comprises a slurry transfer area and a photomask area which are arranged at intervals, and the slurry transfer area and the photomask area are distributed along the circumferential direction of the roller body;

the roller body is embedded in the slurry box through the diaphragm contact port, so that the slurry box is airtight.

Optionally, the method further includes:

the supporting rod is used for supporting the roller body;

and the bearing is arranged at the end part of the support rod.

Optionally, the support rod is connected with the center of the side surface of the roller body.

Optionally, the roll body is a hollow type, and the support rod penetrates through the roll body.

Optionally, the method further includes:

a feed pump for pumping slurry into the slurry cartridge.

Optionally, the feed pump is any one of:

diaphragm pump, Raff peristaltic pump, screw pump.

Optionally, the roller body is any one of the following:

anilox roll, dot roll, diamond roll, ground roll, flexographic roll.

Optionally, the number of lines of the anilox roll is between 90 and 400, inclusive.

Optionally, the depth of the grooves of the anilox roller is between 50 μm and 200 μm, inclusive.

Optionally, the slurry transfer zone is located in the middle of the surface of the roll body.

The present application provides a membrane coating apparatus, comprising: the surface of the roller body comprises a slurry transfer area and a photomask area which are arranged at intervals, and the slurry transfer area and the photomask area are distributed along the circumferential direction of the roller body; the roller body is embedded in the slurry box through the diaphragm contact port, so that the slurry box is airtight.

It can be seen that the diaphragm coating equipment of the application comprises a roller body and a slurry box, wherein the roller body is embedded in the slurry box through a diaphragm contact port, the surface of the roller body comprises a slurry transfer area and a light plate area which are arranged at intervals, the slurry transfer area can carry slurry when the roller body rotates, and the light plate area can not carry slurry, so that when a diaphragm is in contact with the surface of the roller body through the diaphragm contact port, the position corresponding to the slurry transfer area can be transferred with the slurry, the position corresponding to the light plate area can not be transferred with the slurry, namely, the slurry coating which is distributed at intervals is formed on the surface of the diaphragm, the ventilation increment of the area without transferred with the slurry on the diaphragm is zero, the ventilation increment of the diaphragm is integrally reduced, the internal resistance of the lithium battery is reduced, the wettability of electrolyte is improved due to the existence of the area without transferred with the slurry on the diaphragm, meanwhile, the slurry dosage of 30-50% can be reduced, and the cost is saved.

Drawings

For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a membrane coating apparatus provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a separator coating apparatus for coating a separator according to an embodiment of the present disclosure.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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 application.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As described in the background section, currently, a gravure reverse coating is used to apply an adhesive to the surface of the separator, and the coating is uniform, and the adhesive covers the surface of the separator evenly. Firstly, the ventilation increment of the diaphragm after coating is 30-150 s/100ml, so that the internal resistance of the lithium battery is increased, and the wettability of an electrolyte is poor after coating an adhesive; secondly, the amount of adhesive used is large and the cost is high.

In view of the above, the present application provides a membrane coating apparatus, please refer to fig. 1, where fig. 1 is a schematic structural diagram of a membrane coating apparatus provided in an embodiment of the present application, and the apparatus includes:

the roller comprises a roller body 1, wherein the surface of the roller body 1 comprises a slurry transfer area 11 and a printing plate area 12 which are arranged at intervals, and the slurry transfer area 11 and the printing plate area 12 are distributed along the circumferential direction of the roller body 1;

the roller body 1 is embedded in the slurry box 2 through the diaphragm contact port, so that the slurry box 2 has airtightness.

The slurry transfer area 11 and the photomask area 12 are distributed along the circumferential direction of the roller body 1, namely the circumference of the slurry transfer area 11 and the circumference of the photomask area 12 are both equal to the circumference of the roller body 1; the widths of the paste transfer region 11 and the plate region 12 are not particularly limited in this application, depending on the width of the diaphragm. Preferably, the slurry transfer zone 11 corresponds to the edge of the separator to enhance the adhesion of the separator to the battery pole piece. For example, when the width of the diaphragm is 506.5mm, the width of the paste transfer region 11 and the plate region 12 spaced from the surface of the roll body 1 may be 216+54+50+54 +216mm, the diaphragm is centered, and the middle 50mm is the width of the paste transfer region 11.

It is noted that the roll body 1 includes, but is not limited to, any one of an anilox roll, a dot roll, a diamond roll, a ground roll, and a flexographic roll. The slurry transfer area 11 is provided with a groove and can carry the slurry in the slurry box 2, and the smooth area 12 is a flat surface and cannot carry the slurry in the slurry box 2, namely, a slurry coating cannot be formed on the surface of the diaphragm. For example, when the roll body 1 is an anilox roll, the grooves of the slurry transfer zone 11 are diagonal lines (mesh lines), the mesh line angle is typically 45 °, a typical anilox roll surface length is 1400mm, and the circumference is 314 mm; when the roller body 1 is a dotted roller, the grooves of the slurry transfer zone 11 are dotted; when the roll body 1 is a diamond roll, the grooves of the slurry transfer zone 11 are diamond shaped.

Optionally, the number of lines of the anilox roll is between 90 and 400, inclusive; the depth of the groove is between 50 and 200 mu m, inclusive.

The size of the slurry carrying capacity (ink carrying capacity) of the roller body 1 can be adjusted by changing the line number of the anilox roller on one hand and changing the groove depth or the ratio of the groove opening to the screen wall on the other hand. The user can reasonably select and match the anilox rollers with different thread numbers, ink carrying amounts and screen line angles according to the precision grade of the used equipment, the absorption performance of printing materials, the surface smoothness and the difference of required transmission amount on the plate surface. Specifically, the anilox roll may be set to 150 lines, 70 μm groove depth.

The feed inlet is used for feeding slurry into the slurry tank 2, and the slurry may be a glue-based binder such as PVDF (polyvinylidene fluoride) binder, AFL slurry, PMMA (polymethyl methacrylate) binder, or the like. The roller body 1 is embedded in the slurry box 2 through a diaphragm contact port, so that the slurry box 2 has airtightness, and slurry leakage is avoided. The feed inlet and the diaphragm contact port are both arranged on the surface of the pulp box 2, the diaphragm contact port is arranged below, the diaphragm moves from bottom to top, and the feed inlet can be arranged above or on the side.

Optionally, the membrane coating device further comprises a feed pump for pumping slurry into said slurry tank 2 to increase the feed rate. The feed pump includes, but is not limited to, any one of a diaphragm pump, a Raffing peristaltic pump, and a progressive cavity pump.

The diaphragm coating equipment comprises a roller body 1 and a slurry box 2, wherein the roller body 1 is embedded in the slurry box 2 through a diaphragm contact port, the surface of the roller body 1 comprises a slurry transfer area 11 and a light plate area 12 which are arranged at intervals, the slurry transfer area 11 can carry slurry when the roller body 1 rotates, and the light plate area 12 can not carry the slurry, so when a diaphragm is in contact with the surface of the roller body 1 through the diaphragm contact port, the position corresponding to the slurry transfer area 11 can be transferred with the slurry, the position corresponding to the light plate area 12 can not be transferred with the slurry, namely, a slurry coating layer which is distributed at intervals is formed on the surface of the diaphragm, the ventilation increment of the area without the slurry transferred on the diaphragm is zero, the ventilation increment of the diaphragm is reduced on the whole, the internal resistance of a lithium battery is reduced, and the wettability of electrolyte is improved due to the existence of the area without the slurry transferred on the diaphragm, and the use amount of the slurry of 30-50% can be reduced at the same time, and the cost is saved.

Optionally, in an embodiment of the present application, the membrane coating apparatus further includes:

a support rod 3 for supporting the roller body 1;

and a bearing 4 arranged at the end of the support rod 3.

As a practical manner, the support rods 3 are connected to the centers of the side surfaces of the roller body 1, in this case, the number of the support rods 3 is two, and the number of the bearings 4 is also two, and the support rods 3 are located at the end portions of the support rods 3 away from the roller body 1. As another practical manner, the roller body 1 is hollow, the support rods 3 penetrate through the roller body 1, and the number of the bearings 4 is two and the two bearings are respectively located at two ends of the support rods 3. The roller body 1 is driven by a driving device to rotate through the support rod 3 and the bearing 4, wherein the runout is less than or equal to 0.01mm, and the length of the support rod 3 can be set according to actual requirements. Of course, the roller body 1 can also be rotated by manual control.

Preferably, the middle part of the surface of the roller body 1 is the slurry transfer area 11, so that the middle position of the diaphragm is coated with slurry, namely the slurry is coated on the middle positions of the diaphragm and the battery pole piece, and the bonding force of the middle position is ensured.

The schematic diagram of the coating of the separator by the separator coating apparatus is shown in fig. 2, in which a slurry cartridge 2 is filled with slurry, a separator 5 is moved from bottom to top, and a roll body 1 transfers the slurry onto the separator 5 during rotation to form a slurry coating layer 6 and a non-slurry coating layer 7 on the separator 5. The separator 5 may be a PE (Polyethylene) porous film, a PP (Polypropylene) porous film, a PET (Polyethylene terephthalate) porous film, a separator formed by arbitrarily compounding PE, PP, and PET, and the like.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The separator coating apparatus provided in the present application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A membrane coating apparatus, comprising:

2. The membrane coating apparatus of claim 1, further comprising:

the supporting rod is used for supporting the roller body;

and the bearing is arranged at the end part of the support rod.

3. The membrane coating apparatus of claim 2, wherein the support bar is attached to the center of the side of the roll body.

4. The membrane coating apparatus as claimed in claim 2, wherein the roll body is of a hollow type, and the support rod penetrates the roll body.

5. The membrane coating apparatus of claim 1, further comprising:

a feed pump for pumping slurry into the slurry cartridge.

6. The membrane coating apparatus of claim 5, wherein the feed pump is any one of:

diaphragm pump, Raff peristaltic pump, screw pump.

7. The membrane coating apparatus of claim 1, wherein the roller body is any one of:

anilox roll, dot roll, diamond roll, ground roll, flexographic roll.

8. The membrane coating apparatus of claim 7, wherein the anilox roll has a line number between 90 and 400, inclusive.

9. The separator coating device according to claim 7, wherein the anilox roller has a groove depth between 50 μm and 200 μm, inclusive.

10. The separator coating apparatus according to any one of claims 1 to 9, wherein a central portion of the surface of the roll body is the slurry transfer zone.