Die cutting knife roller and die cutting device

Abstract

The utility model provides a die-cutting knife roll and a die-cutting device, the die-cutting knife roll is used for cutting a frame film of a film electrode and comprises a knife roll body, and a first blade and a second blade are arranged on the knife roll body. The first cutting edge is used for cutting an active area of the frame film, and the second cutting edge and the first cutting edge are arranged at intervals in the circumferential direction of the knife roll body and used for cutting exhaust holes in the edge of the frame film. According to the die-cutting knife roll, when the knife roll body rotates, the first cutting edge can make contact with a frame film and cut off an active area, the second cutting edge can act on the edge part of the frame film, and exhaust holes are formed in the edge through the cutting action. Therefore, in the subsequent processes of opposite pasting of the cathode and anode frame membranes, stacking operation of membrane electrodes and the like, gas which is originally easily retained between the cathode and anode frame membranes can be smoothly discharged through the exhaust holes, so that the formation of bubbles can be effectively avoided, and the problem of ungluing of the frame membranes caused by the bubbles can be effectively solved; therefore, the production quality and stability of the membrane electrode can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting tool technical field, especially in, the utility model discloses a die cutting knife roll, simultaneously, the utility model discloses a die cutting device with the die cutting knife roll. BACKGROUND

[0002] The membrane electrode is mainly composed of three layers of CCM (including a proton membrane and cathode and anode catalysts arranged on both sides of the proton membrane), cathode and anode gas diffusion layers and a frame film for supporting on both sides. Among them, the five-in-one packaging process is to package the three layers of CCM and the frame films on both sides together to form five layers of CCM. In the five-in-one packaging process, there are several bonding methods such as roll-to-roll, roll-to-sheet and sheet-to-sheet. The current commonly used roll-to-roll frame film raw material presents a two-layer structure, which is composed of a frame film material (usually a single-sided adhesive PEN) and a release film at the bottom, and the frame film is cut by a die cutting knife roll, and before the five-in-one bonding process, the active area of the frame film needs to be cut into shape.

[0003] Specifically, after the frame film is cut, the active area is cut off, and the waste is discharged at the same time. At this time, the frame film is attached to the adhesive bottom film, and a release film is arranged at the position corresponding to the active area to facilitate peeling off the bottom film in the next process. Subsequently, the cathode and anode frame films and the three layers of CCM are packaged by roll hot pressing process, and finally the finished product is wound to form a five-in-one product.

[0004] However, since the roll-to-roll frame film adopts a continuous tape running mode, when the cathode and anode frame films are bonded with the adhesive surface to the adhesive surface, part of the gas that fails to be discharged in time will be retained between the cathode and anode frame films, thereby forming bubbles. Once the membrane electrode is stacked and operated, these bubbles may cause the frame film to open, which adversely affects the life and performance of the membrane electrode. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to provide a die cutting knife roll which can cut exhaust holes on the frame to effectively avoid bubbles between the cathode and anode frame films.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A die cutting knife roll for cutting the frame film of a membrane electrode, comprising a knife roll body, wherein a first cutting edge and a second cutting edge are arranged on the knife roll body;

[0008] The first cutting edge is used for cutting the active area of the frame film, and the second cutting edge is arranged along the circumference of the knife roll body and spaced apart from the first cutting edge, and is used for cutting exhaust holes on the edge of the frame film.

[0009] Further, the first blade is rectangular and extends along the circumference of the knife roller body.

[0010] Further, the second blade is linear and extends along the circumference of the knife roller body.

[0011] Further, the second blade is cylindrical.

[0012] Further, the second blade is a plurality of blades spaced along the axial direction of the knife roller body.

[0013] Further, the spacing L between the two second blades at the two ends and the length H of the first blade in the axial direction of the knife roller body satisfy: L >= H.

[0014] Further, the knife roller body is provided with a third blade for cutting a positioning hole on the frame film.

[0015] Further, the third blade is L-shaped and at least two of the third blades are arranged on opposite sides of the first blade.

[0016] Further, the knife roller body comprises a cylindrical main body portion and a knife cover wrapped around the main body portion.

[0017] The first blade and the second blade are both arranged on the knife cover.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The die cutting knife roller cuts the active area by the first blade and cuts the exhaust hole by the second blade, so that when the knife roller body rotates, the first blade can contact the frame film and cut off the active area, and the second blade can act on the edge portion of the frame film to form the exhaust hole by cutting. In this way, in the subsequent anode and cathode frame film pasting and membrane electrode stack operation processes, the gas originally easily retained between the anode and cathode frame films can be smoothly discharged through the exhaust hole, the formation of bubbles can be effectively avoided, and the frame film opening caused by the bubbles can be avoided, so that the production quality and stability of the membrane electrode can be improved, and the stable performance can be ensured.

[0020] In addition, the first blade is arranged in a rectangular shape along the circumference of the cutter roller body, which can be well adapted to the overall structure of the existing membrane electrode, and the stress distribution of the rectangular blade is relatively uniform when it is in contact with the frame film during cutting, which can reduce the blade wear or damage caused by local stress concentration. By arranging the second blade in a straight line shape, the shape of the exhaust hole is regular and has high straightness, so that the gas can flow out more smoothly through the exhaust hole during the assembly process of the membrane electrode, avoiding the problems of poor gas flow or blockage caused by irregular exhaust hole shape. At the same time, the regular shape of the exhaust hole is also conducive to maintaining the overall strength and stability of the frame film, and reducing the influence of exhaust hole processing defects on the structural performance of the frame film.

[0021] Secondly, the second blade is arranged in a cylindrical shape, which has a relatively uniform pressure distribution on the frame film due to its rounded shape, and is not easy to cause local stress concentration, so that a circular exhaust hole can be cut on the edge of the frame film relatively smoothly, which is conducive to maintaining the overall strength and stability of the frame film. By arranging the second blade in multiple along the axial direction of the cutter roller body, multiple exhaust holes can be cut on the edge of the frame film at the same time, which is conducive to the rapid and smooth discharge of each part of the gas, avoiding the problem of local gas accumulation or poor discharge caused by uneven distribution of exhaust holes, and further avoiding the formation of bubbles between the cathode and anode frame films, thereby improving the performance stability and reliability of the membrane electrode.

[0022] Furthermore, by arranging the distance L between the two second blades at both ends to be greater than the length H of the first blade in the axial direction of the cutter roller body, it can be ensured that exhaust holes can be formed in a larger range on the edge of the frame film, which is conducive to the smooth and comprehensive discharge of gas on the entire edge area of the frame film, avoiding problems such as local gas pressure abnormalities and poor film layer adhesion caused by limited or uneven distribution of exhaust holes. By arranging the third blade, the positioning hole cut by the third blade can provide an accurate positioning reference for the subsequent assembly process of the membrane electrode, which can improve the overall assembly accuracy and efficiency of the membrane electrode.

[0023] In addition, by arranging the third blade in an L shape, it has a unique shape structure, and the corner thereof can form a relatively accurate positioning, which is easier to be recognized by manual visual inspection or automatic image recognition system. At the same time, compared with the positioning hole arranged in a non-diagonal line, the L-shaped positioning hole can limit more degrees of freedom, reduce the cumulative error caused by inaccurate positioning, and thus greatly improve the assembly accuracy of the membrane electrode.

[0024] By arranging the cutter roller body to include a cylindrical main body portion and a cutter skin wrapped outside the main body portion, the main body portion can serve as the core support structure of the cutter roller and provide a stable attachment basis for the cutter skin, and the first blade and the second blade are arranged on the cutter skin, so that the blade portion is relatively independent of the main body portion, facilitating the processing, replacement and maintenance of the blade.

[0025] Another purpose of the utility model lies in providing a die cutting device, including the die cutting knife roller as described above.

[0026] The die cutting device, by setting the die cutting knife roller as described above, can effectively avoid the formation of bubbles between the cathode and anode frame films, and the frame film opening problem caused by bubbles, thereby improving the production quality and stability of the membrane electrode, and ensuring the stable performance. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings that form a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0028] Figure 1 The structure diagram of the die cutting knife roller described in the utility model embodiment is shown in the figure;

[0029] Figure 2 The structure diagram of the die cutting knife roller described in the utility model embodiment is shown in the figure;

[0030] Figure 3 The structure diagram of the die cutting knife roller described in the utility model embodiment is shown in the figure;

[0031] Figure 4 The structure diagram of the die cutting knife roller described in the utility model embodiment is shown in the figure.

[0032] BRIEF DESCRIPTION OF DRAWINGS:

[0033] 1, knife roller body;

[0034] 101, main body part; 102, knife skin;

[0035] 1021, first cutting edge; 1022, second cutting edge; 1023, third cutting edge. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "inner", "outer" and the like indicate the position or location relationship based on the position or location relationship shown in the drawing, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connection", "connection", "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific circumstances.

[0039] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0040] In view of the prior art, the roll-to-roll frame film adopts a continuous walking belt mode, and when the anode and cathode frame films are bonded with the rubber surface to the rubber surface, bubbles are easily formed between the two. Therefore, the present embodiment proposes a novel die cutter roller for cutting the frame film of the membrane electrode, which comprises a cutter roller body 1, and a first cutter edge 1021 and a second cutter edge 1022 are arranged on the cutter roller body 1.

[0041] The first cutter edge 1021 is used to cut the active area of the frame film, and the second cutter edge 1022 is arranged along the circumference of the cutter roller body 1 and spaced from the first cutter edge 1021, and is used to cut the exhaust hole at the edge of the frame film. Here, it should be mentioned that the edge of the frame film is generally a non-membrane electrode use area, which will be cut off after the membrane electrode is formed, therefore, the setting of the exhaust hole at the edge of the frame film has no effect on the membrane electrode.

[0042] The die cutting knife roller of the embodiment, by setting the first blade 1021 for cutting the active area, and the second blade 1022 for cutting out the exhaust hole, whereby when the knife roller body 1 rotates, the first blade 1021 can be in contact with the frame film and cut off the active area, and the second blade 1022 can act on the edge part of the frame film, and through the cutting action, the exhaust hole is formed on the edge. In this way, in the subsequent anode and cathode frame film pair sticking and film electrode stack operation and other processes, the gas that is originally easy to stay between the anode and cathode frame films can be smoothly discharged through the exhaust hole, which can effectively avoid the formation of bubbles and the frame film opening caused by bubbles, thereby improving the production quality and stability of the film electrode and ensuring the stable performance.

[0043] Based on the above overall introduction, one exemplary structure of the die cutting knife roller of the embodiment is shown in Figure 1 and Figure 2 , wherein the knife roller body 1 is in the shape of a cylinder as a whole, and connecting shafts extending along the axial direction of the knife roller body 1 are provided at both ends thereof for connection with a motor or other driving device. In addition, as a preferred embodiment, the knife roller body 1 of the embodiment includes a cylindrical main body part 101, and a blade skin 102 wrapped on the main body part 101, and the first blade 1021 and the second blade 1022 are both provided on the blade skin 102, and the unfolded state of the blade skin 102 is shown in Figure 3 .

[0044] Among them, the main body part 101 serves as the core support structure of the knife roller, providing a stable attachment basis for the blade skin 102, and the first blade 1021 and the second blade 1022 are both provided on the blade skin 102, which can make the blade part relatively independent of the main body part 101, facilitating the processing, replacement and maintenance of the blade. In addition, as a specific embodiment, the blade skin 102 of the embodiment can be riveted or welded on the main body part 101. Of course, other conventional ways can also be used to fix it on the main body part 101.

[0045] And it can be understood that, in addition to including the separately provided main body part 101 and blade skin 102, the knife roller body 1 can also be a one-piece structure, in which case the first blade 1021 and the second blade 1022 can be directly provided on the outer surface of the knife roller body 1.

[0046] In combination with Figure 2 and Figure 3 , as a specific embodiment, the first blade 1021 of the embodiment is in the shape of a rectangle and extends along the circumferential direction of the knife roller body 1. That is, the active area cut out on the frame film is in the shape of a rectangle, which can better adapt to the overall structure of the existing film electrode. Moreover, the stress distribution of the rectangular blade is relatively uniform when it is in contact with the frame film for cutting, which can reduce blade wear or damage caused by local stress concentration.

[0047] In addition, as a preferred embodiment, in combination with Figure 1 and Figure 3 In this embodiment, the second cutting edge 1022 is linear, and extends along the circumference of the knife roller body 1. The second cutting edge 1022 of this structure can form long strip-shaped exhaust holes on the frame film. In this embodiment, by setting the second cutting edge 1022 to be linear, the shape of the exhaust hole can be regular and have high straightness. In this way, during the assembly of the membrane electrode, the gas can flow more smoothly through the exhaust hole, avoiding the problem of poor gas flow or blockage caused by irregular exhaust hole shape. At the same time, the regular exhaust hole shape is also conducive to maintaining the overall strength and stability of the frame film, reducing the impact of exhaust hole processing defects on the structural performance of the frame film, thereby improving the overall quality and reliability of the membrane electrode. In addition, the linear cutting edge structure is simple and easy to manufacture.

[0048] As a further embodiment, the second cutting edge 1022 of this embodiment is spaced apart along the axial direction of the knife roller body 1. As a specific embodiment, as shown in Figure 1 In this embodiment, the second cutting edge 1022 is linear, and extends along the circumference of the knife roller body 1. The second cutting edge 1022 of this structure can form long strip-shaped exhaust holes on the frame film. In this embodiment, by setting the second cutting edge 1022 to be linear, the shape of the exhaust hole can be regular and have high straightness. In this way, during the assembly of the membrane electrode, the gas can flow more smoothly through the exhaust hole, avoiding the problem of poor gas flow or blockage caused by irregular exhaust hole shape. At the same time, the regular exhaust hole shape is also conducive to maintaining the overall strength and stability of the frame film, reducing the impact of exhaust hole processing defects on the structural performance of the frame film, thereby improving the overall quality and reliability of the membrane electrode. In addition, the linear cutting edge structure is simple and easy to manufacture.

[0049] At this time, as a preferred embodiment, as shown in Figure 3 The spacing L between the two second cutting edges 1022 at both ends and the length H of the first cutting edge 1021 in the axial direction of the knife roller body 1 satisfy: L≥H. Thus, when the knife roller rotates to cut the exhaust holes of the frame film, the larger spacing between the two second cutting edges 1022 at both ends can cover a wider range of edge regions of the frame film. During the cutting process, multiple second cutting edges 1022 can simultaneously form exhaust holes on the edge of the frame film, facilitating rapid gas discharge.

[0050] A larger spacing between the two cutting edges at both ends ensures that the exhaust hole cutting operation can be effectively performed even if there are some local irregularities on the edge of the frame film. This helps the gas to flow more smoothly and more comprehensively throughout the edge region of the frame film during the subsequent assembly and operation of the membrane electrode, avoiding problems such as local gas pressure abnormalities and poor film layer adhesion caused by limited or uneven distribution of exhaust holes, thereby further improving the performance and quality stability of the membrane electrode.

[0051] In addition, as another embodiment, in addition to the second blade 1022 being set as a straight line as shown in Figure 3 , it can also be set as a cylindrical shape or other shapes as shown in Figure 4 . This structure can also form corresponding circular or other shaped exhaust holes at the edge of the frame film, and can effectively avoid the formation of bubbles between the anode and cathode frame films. At this time, in addition to being set as a row as shown in Figure 4 , it can also be set as multiple rows. In addition, in addition to being provided only on the right edge as shown in Figure 3 , further blades can be provided at other positions of the non-film electrode use area of the frame film according to the exhaust requirements to form exhaust holes at other positions.

[0052] As a further embodiment, the knife roll body 1 is provided with a third blade 1023 for cutting positioning holes on the frame film. By providing the third blade 1023, the positioning holes cut by it can provide accurate positioning reference for the subsequent assembly process of the film electrode, and can improve the overall assembly precision and efficiency of the film electrode. And as a preferred embodiment, the third blade 1023 is L-shaped and at least two of the diagonals of the first blade 1021.

[0053] And as a specific example, as shown in Figures 1 to 3 , the third blade 1023 of the embodiment is four diagonals of the first blade 1021. By setting the third blade 1023 as L-shaped, it has a unique shape structure, and the corners thereof can form relatively accurate positioning points. Whether it is through manual visual inspection or an automatic image recognition system, it is easier to identify and judge the position accuracy. At the same time, compared with the positioning holes of non-diagonal layout, the L-shaped positioning holes can limit more degrees of freedom, reduce the cumulative error caused by inaccurate positioning, and thus can greatly improve the assembly precision of the film electrode. In addition, it is also helpful to quickly find the deviation problem in the film electrode assembly process, which is beneficial to timely adjustment and correction, and improves production efficiency and product qualification rate. And the third blade 1023 is set as L-shaped, which is also convenient for processing and manufacturing.

[0054] It should be noted that in addition to being set as L-shaped, the third blade 1023 can also be set as rectangular or E-shaped or other shapes.

[0055] Based on the above overall introduction, the die-cutting knife roll of the embodiment can form multiple exhaust holes in the non-film electrode use area of the frame film after the frame film is cut by the roll. The gas that cannot be discharged when the film is originally attached will be discharged along the exhaust holes during the roll pressing, which can effectively reduce the accumulation of bubbles and improve the stability of the film electrode life and performance.

[0056] Example Two

[0057] The embodiment relates to a die cutting device, comprising the die cutting roller as described in embodiment one.

[0058] The die cutting device of the embodiment can effectively avoid the formation of bubbles between the cathode and anode frame films and the frame film opening problem caused by the bubbles, so that the production quality and stability of the film electrode can be improved, and the stable performance of the film electrode can be ensured.

[0059] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1.A die cutting knife roller for cutting a frame film of a membrane electrode, characterized in that: it comprises a knife roller body (1) provided with a first knife edge (1021) and a second knife edge (1022) ; the first knife edge (1021) is used for cutting an active area of the frame film, and the second knife edge (1022) is arranged along the circumference of the knife roller body (1) and is used for cutting an exhaust hole on the edge of the frame film. 2.The die cutting knife roller according to claim 1, characterized in that: the first knife edge (1021) is in a rectangular shape and extends along the circumference of the knife roller body (1). 3.The die cutting knife roller according to claim 2, characterized in that: the second knife edge (1022) is in a straight line shape and extends along the circumference of the knife roller body (1). 4.The die cutting knife roller according to claim 2, characterized in that: the second knife edge (1022) is in a cylindrical shape. 5.The die cutting knife roller according to claim 2, characterized in that: the second knife edge (1022) is a plurality of second knife edges arranged along the axial direction of the knife roller body (1). 6.The die cutting knife roller according to claim 5, characterized in that: the distance L between the two second knife edges (1022) at both ends and the length H of the first knife edge (1021) in the axial direction of the knife roller body (1) satisfy the condition of L ≥ H. 7.The die cutting knife roller according to claim 1, characterized in that: the knife roller body (1) is provided with a third knife edge (1023) used for cutting a positioning hole on the frame film. 8.The die cutting knife roller according to claim 7, characterized in that: the third knife edge (1023) is in an L shape and at least two third knife edges are arranged on one diagonal line of the first knife edge (1021). 9.The die cutting knife roller according to any one of claims 1 to 8, characterized in that: the knife roller body (1) comprises a cylindrical main body portion (101) and a knife cover (102) wrapped around the main body portion (101) ; the first knife edge (1021) and the second knife edge (1022) are arranged on the knife cover (102). 10.A die cutting device, characterized in that: it comprises the die cutting knife roller according to any one of claims 1 to 9. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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