CN217589024U

CN217589024U - Transfer printing coating equipment of CCM membrane electrode

Info

Publication number: CN217589024U
Application number: CN202221525036.8U
Authority: CN
Inventors: 吴欣欣; 晁威
Original assignee: Weishi Energy Technology Co Ltd
Current assignee: Weishi Energy Technology Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-10-14
Anticipated expiration: 2032-06-17

Abstract

The utility model belongs to the technical field of fuel cell prepares, a rendition coating equipment of CCM membrane electrode is disclosed. According to the transfer printing coating device of the CCM membrane electrode, the coating head is used for coating the catalyst slurry on the coating roller at a certain speed, the coating roller is used for heating and drying the catalyst slurry, so that a catalyst layer is formed, the catalyst layer is transferred onto the proton exchange membrane by the coating roller under the hot pressing action of the pressing roller and the matching action of the coating roller and the pressing roller, the coating and transferring processes are carried out simultaneously, and the production efficiency is improved; after the coating of the catalyst layer on the proton exchange membrane is finished, the cleaning device can clean the coating roller, so that the catalyst slurry coated on the coating head in the subsequent process is prevented from being polluted by residual catalyst and impurities on the coating roller, and the production quality of the CCM membrane electrode is improved.

Description

Transfer printing coating equipment of CCM membrane electrode

Technical Field

The utility model relates to a fuel cell prepares technical field, especially relates to a rendition coating equipment of CCM membrane electrode.

Background

The membrane electrode of the proton exchange membrane fuel cell mainly comprises a proton exchange membrane, a catalyst layer and a diffusion layer. The catalyst layer is composed of an electrocatalyst and a solid polymer electrolyte. CCM (Catalyst coated membrane) is a three-in-one electrode structure composed of a cathode Catalyst layer, an anode Catalyst layer and a proton exchange membrane, and the preparation method is usually a transfer method and a direct coating method.

The CCM is prepared by a transfer printing method, namely cathode and anode catalytic slurry is firstly coated on a special base film, a cathode and anode catalytic layer is prepared after drying, and then the cathode and anode catalytic layer is hot-pressed with a proton exchange membrane, so that the CCM is prepared. The direct coating method for preparing CCM is to coat the cathode catalyst slurry and the anode catalyst slurry on two sides of the proton exchange membrane respectively and prepare the CCM after drying, but the problem of cracking of the catalyst layer caused by swelling of the proton exchange membrane can occur in the process.

For the problem of high cost brought by CCM preparation by transfer printing, the traditional solution is to adopt a base film with relatively low price for production; for the cracking problem of CCM catalytic layers prepared by direct coating, the traditional solution is to optimize the catalyst slurry to reduce cracking.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rendition coating equipment of CCM membrane electrode, its simple structure can low-cost, prepare out high-quality CCM membrane electrode fast, is applicable to mass production CCM membrane electrode.

To achieve the purpose, the utility model adopts the following technical proposal:

the transfer printing coating device of the CCM membrane electrode comprises a coating head, a coating roller, a press roller and a cleaning device; the coating head is used for coating the catalyst layer on the coating roller; the coating roll coated with the catalyst layer is abutted against one side face of the proton exchange membrane, and the coating roll can heat the catalyst layer at a first preset temperature; the pressing roller and the coating roller are oppositely arranged and abut against the other side face of the proton exchange membrane, the pressing roller can apply pressure to the coating roller and transfer the catalyst layer on the coating roller onto the proton exchange membrane, and the pressing roller can heat the proton exchange membrane at a second preset temperature; the cleaning device is in contact with the coating roll, and can clean the coating roll after the coating roll coats the catalyst layer on the proton exchange membrane.

Optionally, the cleaning device comprises a cleaning roller, the cleaning roller is located between the coating roller and the proton exchange membrane transferred with the catalytic layer, the cleaning roller abuts against the coating roller, and the cleaning roller and the coating roller are equal in length.

Optionally, the coating roll is externally coated with a release layer.

Alternatively, the release layer is made of any one of a PTFE film, a PET film, and a PI film.

Optionally, the transfer printing coating device for the CCM membrane electrode further comprises a winding device, and the winding device is used for winding the transferred proton exchange membrane and providing power for the movement of the proton exchange membrane.

Optionally, the diameter, the rotation speed and the first preset temperature of the coating roller are such that after the coating head coats the catalytic layer on the coating roller, the catalytic layer is already dried when the catalytic layer on the coating roller contacts the proton exchange membrane.

Optionally, a first heating device is arranged in the coating roll, and the first preset temperature is in the range of 40-150 ℃.

Optionally, a second heating device is arranged in the pressing roller, and the second preset temperature is in the range of 100-160 ℃.

Optionally, the pressure applied by the pressing roller ranges from 80kg to 160kg.

Optionally, the movement speeds of the coating roller, the pressing roller and the proton exchange membrane are the same.

Has the beneficial effects that:

according to the transfer printing coating device of the CCM membrane electrode, the coating head is used for coating the catalyst slurry on the coating roller at a certain speed, the coating roller is used for heating and drying the catalyst slurry, so that a catalyst layer is formed, the catalyst layer is transferred onto the proton exchange membrane by the coating roller under the hot pressing action of the pressing roller and the matching action of the coating roller and the pressing roller, the coating and transferring processes are carried out simultaneously, and the production efficiency is improved; after the coating of the catalyst layer on the proton exchange membrane is finished, the cleaning device can clean the coating roller, so that the catalyst slurry coated on the coating head in the subsequent process is prevented from being polluted by residual catalyst and impurities on the coating roller, and the production quality of the CCM membrane electrode is improved. The transfer printing coating equipment of the CCM membrane electrode directly coats the catalyst slurry on the coating roller, a transfer printing basement membrane and a coating drying box are not needed in the process, the production process flow is simple, the CCM membrane electrode without cracks can be rapidly prepared at low cost, and the transfer printing coating equipment is suitable for mass production of the CCM membrane electrode.

Drawings

Fig. 1 is a schematic view of a transfer coating apparatus for a CCM membrane electrode according to an embodiment of the present invention.

In the figure:

10. a catalytic layer; 20. a proton exchange membrane; 100. coating heads; 200. a coating roll; 300. a laminating roller; 400. And cleaning the roller.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Referring to fig. 1, in the present embodiment, the transfer coating apparatus for CCM membrane electrode comprises a coating head 100, a coating roller 200, a pressing roller 300 and a cleaning device; the coating head 100 is used for coating the catalyst layer 10 on the coating roller 200; the coating roller 200 coated with the catalytic layer 10 abuts against one side surface of the proton exchange membrane 20, and the coating roller 200 can heat the catalytic layer 10 at a first preset temperature; the pressing roller 300 is opposite to the coating roller 200 and abuts against the other side surface of the proton exchange membrane 20, the pressing roller 300 can apply pressure to the coating roller 200 and transfer the catalyst layer 10 on the coating roller 200 to the proton exchange membrane 20, and the pressing roller 300 can heat the proton exchange membrane 20 at a second preset temperature; the cleaning device is in contact with the coating roller 200, and can clean the coating roller 200 after the coating roller 200 coats the catalyst layer 10 on the proton exchange membrane 20.

The transfer coating device of the CCM membrane electrode transfers the catalyst layer 10 to the proton exchange membrane 20 from a single side, the catalyst layer 10 is one of the cathode catalyst layer 10 or the anode catalyst layer 10, when the CCM membrane electrode is prepared, the cathode catalyst layer 10 and the anode catalyst layer 10 need to be respectively coated on two sides of the proton exchange membrane 20, after one side of the transfer coating device of the CCM membrane electrode in the embodiment is coated, the other side of the transfer coating device of the other CCM membrane electrode is coated, only the coating rollers 200 of the transfer coating devices of the two CCM membrane electrodes are respectively arranged on two sides of the proton exchange membrane 20, and therefore the required CCM membrane electrode is obtained. The transfer printing coating equipment of the CCM membrane electrode directly coats the catalyst slurry on the coating roller 200, a transfer printing basement membrane and a coating drying box are not needed in the process, the production process flow is simple, the CCM membrane electrode without cracks can be rapidly prepared at low cost, and the transfer printing coating equipment is suitable for mass production of the CCM membrane electrode.

According to the transfer coating device of the CCM membrane electrode, catalyst slurry is coated on a coating roller 200 at a certain speed by using a coating head 100, the coating roller 200 heats and dries the catalyst slurry to form a catalyst layer 10, the catalyst layer 10 is transferred onto a proton exchange membrane 20 by the coating roller 200 under the hot-pressing action of a pressing roller 300 and the matching action of the coating roller 200 and the pressing roller 300, and the coating and transferring processes are carried out simultaneously, so that the production efficiency is improved; after the coating of the catalyst layer 10 on the proton exchange membrane 20 is completed, the cleaning device can clean the coating roller 200, prevent the catalyst and impurities remaining on the coating roller 200 from polluting the catalyst slurry coated by the coating head 100 in the subsequent process, and improve the production quality of the CCM membrane electrode.

Specifically, in the present embodiment, the coating head 100 is a slit coating head; the slit type coating head can press catalyst slurry out along a die gap and transfer the catalyst slurry onto the coating roller 200 under a certain pressure, and has the advantages of high coating speed, good coating uniformity and wide coating window.

Further, the coating head 100 and the coating roller 200 are disposed at a predetermined distance, and the predetermined distance enables the catalyst slurry extruded by the coating head 100 to be uniformly coated on the coating roller, and the value of the predetermined distance is selected as a conventional technical means in the art and is not described herein again.

Referring to fig. 1, specifically, in the present embodiment, the cleaning device includes a cleaning roller 400, the cleaning roller 400 is located between the coating roller 200 and the proton exchange membrane 20 to which the catalyst layer 10 is transferred, the cleaning roller 400 abuts against the coating roller 200, and the cleaning roller 400 and the coating roller 200 have the same length. The cleaning roller 400 is used for cleaning the coating roller 200 after the catalytic layer 10 is transferred, and the cleaning roller 400 has the same length as the coating roller 200, so that the cleaning roller 400 can completely cover the axial length of the coating roller 200, can be well matched with the surface of the coating roller 200, and has better cleaning effect.

As a preferred embodiment, the coating roll 200 is externally coated with a release layer (not shown in the figure). The release layer can facilitate the catalyst layer to be separated from the coating roll 200, and can prevent the catalyst layer 10 from remaining on the coating roll 200, so that the production quality of the subsequent coating roll 200 for transferring the catalyst layer 10 is not affected. Further, the release layer is made of any one of a PTFE film, a PET film, and a PI film.

In this embodiment, the transfer coating apparatus for CCM membrane electrode further comprises a rolling device (not shown in the figure) for rolling the proton exchange membrane 20 coated with the catalyst layer 10 and providing power for the movement of the proton exchange membrane 20.

Preferably, the diameter, the rotation speed, and the first preset temperature of the coating roll 200 are such that the catalytic layer 10 has been dried when the catalytic layer 10 on the coating roll 200 is in contact with the proton exchange membrane 20 after the coating head 100 coats the catalytic layer 10 onto the coating roll 200. That is, the diameter, the rotation speed and the first preset temperature of the coating roller 200 are determined by the drying characteristics of the catalyst slurry, the diameter of the coating roller 200 and the diameter of the pressing roller 300 may be the same or different, and the transfer printing and coating device of the CCM membrane electrode arranged in this way can be used for drying the CCM membrane electrode when the CCM membrane electrode is transferred onto the proton exchange membrane 20, so that the CCM membrane electrode with a flat surface, a uniform thickness and no cracks can be prepared.

In order to realize the heating function, in the embodiment, a first heating device (not shown in the figure) is disposed in the coating roller 200, a second heating device (not shown in the figure) is disposed in the pressing roller 300, and both the first heating device and the second heating device are selected as electric heating rods, so that the coating roller 200 can heat the catalyst layer 10 at a first preset temperature, and the pressing roller 300 can heat the proton exchange membrane 20 at a second preset temperature. The value ranges of the first preset temperature, the second preset temperature and the pressure applied by the pressing roller 300 are determined by the characteristics of the selected catalyst slurry, and those skilled in the art can select the values according to actual conditions to achieve the technical effect of uniformly and flatly transferring the catalyst layer 10 onto the proton exchange membrane 20. In this embodiment, the first preset temperature ranges from 40 ℃ to 150 ℃, the second preset temperature ranges from 100 ℃ to 160 ℃, and the pressure applied by the pressing roller 300 ranges from 80kg to 160kg.

Specifically, the coating roller 200 and the pressing roller 300 have the same movement speed as the proton exchange membrane 20. The coating roller 200 and the nip roller 300 are both driven to rotate by a motor so that the coating roller 200 and the nip roller 300 rotate in opposite directions and at the same speed. The transfer printing coating device of the CCM membrane electrode can enable the movement speed of the coating roller 200 for transferring the catalyst layer 10 to be the same as that of the proton exchange membrane 20, prevent the catalyst layer 10 from cracking frequently caused by the excessively high movement speed of the proton exchange membrane 20 and prevent the catalyst layer 10 from wrinkling caused by the excessively low movement speed, and can improve the production quality of the finally prepared CCM membrane electrode.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A transfer coating apparatus of a CCM membrane electrode, comprising:

a coater head (100), the coater head (100) being configured to coat the catalyst layer (10) onto a coater roll (200);

a coating roll (200), wherein the coating roll (200) coated with the catalytic layer (10) abuts against one side face of a proton exchange membrane (20), and the coating roll (200) can heat the catalytic layer (10) at a first preset temperature;

the pressing roller (300) is arranged opposite to the coating roller (200) and abutted against the other side face of the proton exchange membrane (20), the pressing roller (300) can apply pressure to the coating roller (200) and transfer the catalyst layer (10) on the coating roller (200) to the proton exchange membrane (20), and the pressing roller (300) can heat the proton exchange membrane (20) at a second preset temperature;

a cleaning device that is in contact with the coating roller (200) and that is capable of cleaning the coating roller (200) after the coating roller (200) has coated the catalyst layer (10) on the proton exchange membrane (20).

2. The transfer coating apparatus for a CCM membrane electrode according to claim 1, wherein the cleaning device comprises a cleaning roller (400), the cleaning roller (400) is located between the coating roller (200) and the proton exchange membrane (20) to which the catalytic layer (10) is transferred, the cleaning roller (400) abuts against the coating roller (200), and the cleaning roller (400) and the coating roller (200) are equal in length.

3. The CCM membrane electrode transfer coating apparatus of claim 1 wherein the coating roll (200) is coated with a release layer.

4. The transfer coating apparatus for a CCM membrane electrode according to claim 3, wherein the release layer is made of any one of a PTFE film, a PET film, and a PI film.

5. The transfer coating device for the CCM membrane electrode according to claim 1, further comprising a rolling device for rolling the transferred proton exchange membrane (20) and providing power for the movement of the proton exchange membrane (20).

6. The CCM membrane electrode transfer coating apparatus according to claim 1, wherein the diameter, rotation speed and first preset temperature of the coating roll (200) are such that the catalytic layer (10) has been dried when the catalytic layer (10) on the coating roll (200) is in contact with the proton exchange membrane (20) after the coating head (100) coats the catalytic layer (10) on the coating roll (200).

7. The transfer printing and coating device of the CCM membrane electrode assembly according to any one of claims 1-6, wherein a first heating device is arranged in the coating roller (200), and the first preset temperature is in the range of 40-150 ℃.

8. The transfer printing coating device of the CCM membrane electrode assembly according to any one of claims 1-6, wherein a second heating device is arranged in the pressing roller (300), and the second preset temperature is in the range of 100-160 ℃.

9. The CCM membrane electrode transfer coating device according to any one of claims 1-6, wherein the pressure applied by the pressing roller (300) is in the range of 80kg-160kg.

10. The CCM membrane electrode transfer coating device according to any one of claims 1-6, wherein the coating roller (200), the laminating roller (300) and the proton exchange membrane (20) move at the same speed.