Welding tool, welding method of monopolar plate and monopolar plate

Abstract

The present application discloses a welding tool, a welding method for a monopolar plate, and a monopolar plate. The welding tool includes a pressing plate and a bottom plate. The pressing plate has a first through hole for accommodating a first welding part of a welding device. The bottom plate has a welding area. The welding area has a plurality of second through holes. The plurality of second through holes are spaced apart along the length direction and the width direction of the welding tool. The second through holes are used to accommodate a second welding part of the welding device. The pressing plate is slidably connected to the bottom plate. During the movement of the pressing plate relative to the bottom plate, the projection of the second through hole along the height direction of the welding tool is located within the projection range of the first through hole. The first welding part and the second welding part clamp the assembly to be welded through the first through hole and the second through hole respectively, and generate heat to form a high temperature after current is passed, so that the components in the assembly to be welded can be connected into one in a high temperature environment, and then the assembly to be welded is welded by resistance spot welding, which is conducive to improving welding quality and welding efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of welding equipment, and in particular to a welding tool, a welding method for a monopolar plate, and a monopolar plate. Background Art

[0002] At present, both electrolyzers and fuel cells use a one-plate-two-field approach to improve the airtightness of electrolyzers and fuel cells. Among them, both electrolyzers and fuel cells include stacked plates, sealing strips and membrane electrode assemblies. The sealing strips are installed on the plates through ribs to limit the displacement of the sealing strips during the lamination process and reduce the possibility of the sealing strips being crushed and failing.

[0003] In the prior art, laser welding is usually used to fix the ribs to the plate so that the sealing strip can be installed between two adjacent reinforcing ribs to improve the installation stability of the sealing strip. However, during the laser welding process, it is necessary to continuously provide protective gas, and defects such as cracks and pores are easily generated at the weld, resulting in high welding costs and low welding quality. Summary of the invention

[0004] In view of this, the present application provides a welding tool, a welding method for a monopolar plate and a monopolar plate to solve the technical problems of high welding cost and low welding quality between the rib and the plate in the prior art.

[0005] The present application provides a welding tool for welding components to be welded, the welding tool comprising a pressing plate and a base plate, the pressing plate having a first through hole, the first through hole being used to accommodate a first welding part of a welding device, the base plate having a welding area, the welding area having a plurality of second through holes, the plurality of second through holes being spaced apart along the length direction and the width direction of the welding tool, the second through holes being used to accommodate a second welding part of the welding device; wherein the pressing plate is slidably connected to the base plate, and during the movement of the pressing plate relative to the base plate, the projection of the second through hole along the height direction of the welding tool is located within the projection range of the first through hole, and the first welding part and the second welding part clamp the components to be welded through the first through hole and the second through hole respectively.

[0006] In the embodiment of the present application, the welding area is used to place the assembly to be welded, so that after the pressure plate and the base plate are connected, the two can clamp the assembly to be welded along the height direction of the welding tooling, reduce the possibility of displacement of the assembly to be welded relative to the base plate, and improve the safety during welding. In the process of welding the assembly to be welded, the first welding part and the second welding part clamp the assembly to be welded through the first through hole and the second through hole respectively, and generate heat to form a high temperature after the current is passed, so that the various components in the assembly to be welded can be connected into one in a high temperature environment, thereby realizing the welding of the assembly to be welded.

[0007] At the same time, during the welding process of the assembly to be welded, the pressing plate can slide relative to the bottom plate in the welding area, so that the pressing plate can squeeze out impurities and gas between the components of the assembly to be welded before the first welding part and the second welding part clamp the assembly to be welded through the first through hole and the second through hole respectively, which is conducive to further improving the welding quality. And during the welding process of the assembly to be welded, the pressing plate can continuously apply pressure to the assembly to be welded, while improving the welding efficiency, reducing the possibility of arcing on the surfaces of the components in the assembly to be welded that contact each other, which is conducive to further improving the safety during welding and more in line with actual use needs.

[0008] Therefore, in this embodiment, the welding equipment can perform resistance spot welding on the assembly to be welded through the first through hole of the pressure plate and the multiple second through holes of the base plate, thereby eliminating the need for laser welding and the need to set a protective gas, which is beneficial for reducing the possibility of defects such as cracks and pores at the weld, improving welding quality and welding efficiency, and reducing the production cost of the monopolar plate.

[0009] In a possible embodiment, the pressure plate includes at least two first grooves, and the welding area includes at least two second grooves, at least two of the second grooves are spaced apart along the length and width directions of the welding tool, and each of the second grooves overlaps with the projection of each of the first grooves along the height direction of the welding tool; the second groove is used to accommodate the first rib of the component to be welded, and the first groove is used to accommodate the second rib of the component to be welded.

[0010] In a possible implementation manner, the first groove extends along the movement direction of the pressing plate and is connected to the first through hole, and the first groove is rectangular or arc-shaped.

[0011] In a possible embodiment, along the height direction of the welding tool, the base plate has a first surface and a second surface that are relatively arranged, the first surface is provided with the second groove, the second surface is provided with the third groove, the bottom wall of the second groove is provided with the second through hole, and the second groove and the third groove are connected through the second through hole.

[0012] In a possible implementation manner, along the length direction and the width direction of the welding tool, the second groove is an annular structure.

[0013] In a possible implementation, along the height direction of the welding tool, the cross-sectional shape of the third groove is trapezoidal or semicircular.

[0014] In a possible embodiment, a fourth groove is further provided on the first surface, and along the length and width directions of the welding tool, the fourth groove is located on the side of the second groove away from the edge of the bottom plate and is connected with the second groove, and in the height direction of the welding tool, the bottom wall of the fourth groove is provided with the second through hole, and the fourth groove and the third groove are connected through the second through hole; the second groove, the third groove and the fourth groove form the welding area.

[0015] In a possible implementation, one of the pressure plate and the base plate is provided with a slider, and the other is provided with a slide groove, and the slider is slidably connected to the slide groove so that the pressure plate moves relative to the base plate within the plane of the base plate.

[0016] In a possible embodiment, the pressure plate is provided with the slider, and the base plate is provided with the slide groove, and the slide groove is located on the side of the welding area facing the edge of the base plate along the length direction and the width direction of the welding tooling; the slide groove includes a first section and a second section, the first section extends along the length direction of the welding tooling, and the second section extends along the width direction of the welding tooling, and the first section is connected to and perpendicular to the second section; the pressure plate includes a first pressure plate and a second pressure plate, the first pressure plate slides along the first section, and the second pressure plate slides along the second section.

[0017] In a possible implementation, a reinforcing rib is provided between two adjacent second through holes along the length direction and the width direction of the welding tool.

[0018] In a possible implementation, along the length direction and the width direction of the welding tool, the distance between two adjacent second through holes is L, and L satisfies 2mm≤L≤20mm.

[0019] In a possible implementation manner, the bottom plate is provided with a third through hole, and along the length direction and the width direction of the welding tool, the third through hole is located on a side of the welding area away from the edge of the bottom plate.

[0020] The present application also provides a welding method for a monopolar plate, which uses any of the welding tools described above to weld a first convex rib, a second convex rib, a third convex rib and a fourth convex rib to the plate, and the welding method includes:

[0021] The first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the electrode plate are placed in the welding area; the electrode plate and the first convex rib, the electrode plate and the second convex rib are welded through the first through hole and the second through hole; the electrode plate and the third convex rib, the electrode plate and the fourth convex rib are welded through the second through hole to form the monopolar plate.

[0022] In an embodiment of the present application, the welding area is used to place the components to be welded (i.e., the first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the electrode plate). After the components to be welded are placed in the welding area, the pressure plate and the base plate can clamp the components to be welded along the height direction of the welding tooling to reduce the possibility of relative movement between the parts to be welded and improve the safety during welding.

[0023] During the process of welding the first convex rib, the second convex rib and the electrode plate, the first welding portion can abut against the second convex rib through the first through hole, and the second welding portion can abut against the first convex rib through the second through hole, and generate heat to form a high temperature after the current is passed through, so that the contact surfaces between the first convex rib and the electrode plate and the contact surfaces between the second convex rib and the electrode plate can melt and connect into one in a high temperature environment, thereby realizing the preliminary welding of the components to be welded.

[0024] During the process of welding the third rib, the fourth rib and the pole plate, the first welding portion can directly abut against the fourth rib, and the second welding portion can abut against the third rib through the second through hole, and generate heat to form a high temperature after the current is passed through, so that the contact surfaces between the third rib and the pole plate and the contact surfaces between the fourth rib and the pole plate can melt and connect into one in a high temperature environment, thereby realizing the welding of the components to be welded to form a single pole plate.

[0025] In a possible implementation manner, the pressing plate is provided with a first groove, the bottom plate is provided with a second groove and a fourth groove, and when the first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the electrode plate are placed in the welding area, the welding method includes:

[0026] Place the first rib in the second groove, and place the third rib in the fourth groove; cover the electrode plate on the first rib and the third rib; place the second rib and the fourth rib on the electrode plate so that the first rib and the third rib, the second rib and the fourth rib are located on both sides of the electrode plate along the thickness direction; cooperate and connect the pressing plate with the bottom plate, and make the second rib located in the first groove.

[0027] Among them, the second groove is connected to the fourth groove, and along the length direction and width direction of the electrode plate, the third rib is located on the side of the first rib away from the edge of the electrode plate and is connected to the first rib, and the fourth rib is located on the side of the second rib away from the edge of the electrode plate and is connected to the second rib.

[0028] In a possible implementation manner, when the electrode plate and the third rib, and the electrode plate and the fourth rib are welded through the second through hole, the welding method includes:

[0029] The pressing plate is released from the bottom plate; and the pole plate and the third convex rib, and the pole plate and the fourth convex rib are welded through the second through hole.

[0030] The present application also provides a monopolar plate, which is made by the welding method described in any one of the above items, and the monopolar plate includes a first convex rib, a second convex rib, a third convex rib, a fourth convex rib and a polar plate; along the thickness direction of the monopolar plate, the first convex rib and the third convex rib, the second convex rib and the fourth convex rib are respectively connected to the two sides of the polar plate, and along the length direction and the width direction of the monopolar plate, the third convex rib is located on the side of the first convex rib away from the edge of the polar plate and is connected to the first convex rib, and the fourth convex rib is located on the side of the second convex rib away from the edge of the polar plate and is connected to the second convex rib; wherein, along the thickness direction of the monopolar plate, the projections of the first convex rib and the second convex rib overlap, and the projections of the third convex rib and the fourth convex rib overlap or are misaligned.

[0031] In the embodiment of the present application, the first convex rib and the second convex rib are both annular structures, and along the length and width directions of the electrode plate, the third convex rib is located on the side of the first convex rib away from the edge of the electrode plate and is connected to the first convex rib, and the fourth convex rib is located on the side of the second convex rib away from the edge of the electrode plate and is connected to the second convex rib.

[0032] The monopolar plate includes at least two first ribs and two second ribs, and an annular space for accommodating a first seal can be formed between two adjacent first ribs and between two adjacent second ribs. The first seal is used to isolate the reaction area of ​​the monopolar plate from the external environment to avoid the risk of leakage of the electrolyzer or fuel cell during operation, thereby helping to improve the safety and reliability of the electrolyzer or fuel cell during operation. In the thickness direction of the monopolar plate, the projections of the first rib and the second rib overlap, which can enable the monopolar plate to form a one-plate-two-field structure, which is conducive to reducing the overall volume of the electrolyzer or fuel cell, thereby reducing production costs.

[0033] At the same time, the monopolar plate also includes at least two third ribs and two fourth ribs, and a space for accommodating a second seal can be formed between two adjacent third ribs and between two adjacent second ribs. The second seal is used to isolate the cavity area and the flow field area in the monopolar plate, as well as two adjacent cavity areas, so as to avoid the risk of cross-flow of fluids in different cavity areas during the operation of the electrolyzer or fuel cell, thereby helping to improve the safety and reliability of the electrolyzer or fuel cell during operation. Among them, along the thickness direction of the monopolar plate, the projections of the third rib and the fourth rib overlap or are misaligned, so that the monopolar plate can be applied to the electrolyzer or fuel cell, which is conducive to expanding the application range of the monopolar plate and making it more versatile.

[0034] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 This is a schematic structural diagram of a welding tool provided in this application in a specific embodiment;

[0037] Figure 2 for Figure 1 Schematic diagram of the structure of the medium pressure plate;

[0038] Figure 3 for Figure 1 Schematic diagram of the structure of the midsole plate;

[0039] Figure 4 for Figure 3 A partial enlarged view of

[0040] Figure 5 for Figure 3 A partial cross-sectional view of

[0041] Figure 6 A schematic diagram of the structure of a monopolar plate provided in the present application in a specific embodiment;

[0042] Figure 7 for Figure 6 A partial enlarged view of

[0043] Description of reference numerals:

[0044] 1-Welding tooling;

[0045] 11-pressing plate;

[0046] 111- first pressing plate;

[0047] 112- second pressing plate;

[0048] 113-first through hole;

[0049] 114-first groove;

[0050] 115-slider;

[0051] 116-fitting surface;

[0052] 12- bottom plate;

[0053] 121-side 1;

[0054] 121a - second groove;

[0055] 121b- fourth groove;

[0056] 121c-chute;

[0057] 121c1- first paragraph;

[0058] 121c2-Second paragraph;

[0059] 122-side 2;

[0060] 122a-third groove;

[0061] 123- second through hole;

[0062] 124-Reinforcement ribs;

[0063] 125-third through hole;

[0064] 2-monopolar plate;

[0065] 21- first convex rib;

[0066] 22- second convex rib;

[0067] 23- third convex rib;

[0068] 24- fourth convex rib;

[0069] 25-plate;

[0070] 3- Seals.

[0071] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0072] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0073] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0074] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0075] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0076] The embodiment of the present application provides a welding tool for welding components to be welded, such as Figure 1 and Figure 5 As shown, the welding tool 1 includes a pressing plate 11 and a bottom plate 12. The pressing plate 11 has a first through hole 113, and the first through hole 113 is used to accommodate a first welding part of the welding device. The bottom plate 12 has a welding area (not shown in the figure), and the welding area has a plurality of second through holes 123. The plurality of second through holes 123 are spaced apart along the length direction and the width direction of the welding tool 1, and the second through holes 123 are used to accommodate a second welding part of the welding device.

[0077] Among them, the pressing plate 11 is slidably connected to the base plate 12. During the movement of the pressing plate 11 relative to the base plate 12, the projection of the second through hole 123 along the height direction of the welding tooling 1 is located within the projection range of the first through hole 113, and the first welding part and the second welding part clamp the components to be welded through the first through hole 113 and the second through hole 123 respectively.

[0078] In the embodiment of the present application, the pressing plate 11 and the bottom plate 12 are distributed along the height direction of the welding tool 1, and the bottom plate 12 has a welding area on the side facing the pressing plate 11, and the welding area is used to place the components to be welded, so that after the pressing plate 11 and the bottom plate 12 are matched and connected, the pressing plate 11 and the bottom plate 12 can clamp the components to be welded along the height direction of the welding tool 1, thereby reducing the possibility of displacement of the components to be welded relative to the bottom plate 12 and improving safety during welding.

[0079] Among them, the pressing plate 11 has a first through hole 113 for accommodating the first welding part of the welding equipment, and the bottom plate 12 has a second through hole 123 for accommodating the second welding part of the welding equipment, and the projection of the second through hole 123 along the height direction of the welding tool 1 is located within the projection range of the first through hole 113, so that in the process of welding the assembly to be welded, the first welding part and the second welding part clamp the assembly to be welded through the first through hole 113 and the second through hole 123 respectively, and generate heat to form a high temperature after the current is passed, so that the various components in the assembly to be welded can be connected into one in a high temperature environment, thereby realizing the welding of the assembly to be welded.

[0080] Specifically, the base plate 12 has a plurality of second through holes 123, and the plurality of second through holes 123 are spaced apart along the length and width directions of the welding tool 1, and the pressure plate 11 is slidably connected to the base plate 12. The pressure plate 11 can slide relative to the base plate 12 so that the projections of the second through holes 123 along the height direction of the welding tool 1 fall into the projection range of the first through hole 113 in sequence, so that during the welding process of the assembly to be welded, the welding equipment can perform resistance spot welding on the assembly to be welded through the welding tool 1, which is beneficial to improving the welding efficiency while ensuring the welding quality.

[0081] At the same time, during the welding process of the assembly to be welded, the pressing plate 11 can slide relative to the bottom plate 12 in the welding area, so that the pressing plate 11 can squeeze out the impurities and gas between the components in the assembly to be welded before the first welding part and the second welding part clamp the assembly to be welded through the first through hole 113 and the second through hole 123 respectively, which is conducive to further improving the welding quality. And during the welding process of the assembly to be welded, the pressing plate 11 can continuously apply pressure to the assembly to be welded, while improving the welding efficiency, reducing the possibility of arcing on the surfaces of the components in the assembly to be welded that contact each other, which is conducive to further improving the safety during welding and more in line with actual use needs.

[0082] In some embodiments, the assembly to be welded includes at least a first convex rib 21, a second convex rib 22 and a plate 25. During welding of the assembly to be welded, the first welding portion and the second welding portion are heated to form a high temperature after current is passed through them. Under the high temperature environment of the first welding portion and the second welding portion, the surfaces of the first convex rib 21, the second convex rib 22 and the plate 25 in contact with each other melt and connect into one body, so as to form a Figure 6 The monopolar plate 2.

[0083] Therefore, in this embodiment, the welding equipment can perform resistance spot welding on the assembly to be welded through the first through hole 113 of the pressure plate 11 and the multiple second through holes 123 of the base plate 12, thereby eliminating the need for laser welding and the need to set a protective gas, which is beneficial for reducing the possibility of defects such as cracks and pores at the weld, improving welding quality and welding efficiency, and reducing the production cost of the monopolar plate 2.

[0084] In a specific embodiment, Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the pressure plate 11 includes at least two first grooves 114, and the welding area includes at least two second grooves 121a. The at least two second grooves 121a are spaced apart along the length and width directions of the welding tool 1, and the projections of each second groove 121a and each first groove 114 along the height direction of the welding tool 1 overlap.

[0085] The second groove 121a is used to accommodate the first convex rib 21 of the assembly to be welded, and the first groove 114 is used to accommodate the second convex rib 22 of the assembly to be welded.

[0086] In the embodiment of the present application, the pressure plate 11 includes at least two first grooves 114, the bottom plate 12 includes at least two second grooves 121a, and the projections of each second groove 121a and each first groove 114 along the height direction of the welding tooling 1 overlap, so that in the process of welding the assembly to be welded, the first rib 21 and the electrode plate 25, and the second rib 22 and the electrode plate 25 can be welded simultaneously, which is beneficial to improving the welding efficiency. At the same time, the consistency of the welding positions of the first rib 21 and the second rib 22 can also be improved through the overlapping projections, which is beneficial to improving the yield rate of the monopolar plate 2.

[0087] In addition, when at least two second grooves 121a are spaced apart, the corresponding at least two first grooves 114 are also spaced apart, so that after the assembly to be welded is welded to form a single-pole plate 2, one side of the plate 25 has two spaced apart first ribs 21, and the other side has two spaced apart second ribs 22, so that there is a accommodating space for accommodating the seal 3 between the two adjacent first ribs 21 and the two adjacent second ribs 22, so that in the subsequent lamination process, the two adjacent first ribs 21 and the two adjacent second ribs 22 can both limit the seal 3, reduce the possibility of displacement or crushing of the seal 3, thereby improving the pressure resistance of the seal 3, and then improving the sealing of the electrolyzer or fuel cell.

[0088] Specifically, when the first rib 21 is placed in the second groove 121a, along the height direction of the welding tool 1, the upper surface of the first rib 21 is flush with the upper surface of the second groove 121a to ensure the flatness of the welding area facing the pressure plate 11, thereby ensuring the flatness of the electrode 25 after being placed in the welding area, which is beneficial to improving the overall welding quality.

[0089] In a specific embodiment, Figure 2 As shown, the first groove 114 extends along the movement direction of the pressing plate 11 and is connected to the first through hole 113 . The first groove 114 is rectangular or arc-shaped.

[0090] In the embodiment of the present application, along the height direction of the welding tooling 1, the side of the pressing plate 11 facing the bottom plate 12 has a fitting surface 116 for fitting with the electrode plate 25 to increase the contact area between the pressing plate 11 and the electrode plate 25, which is beneficial to improving the extrusion effect of the pressing plate 11 on the assembly to be welded.

[0091] Among them, the first groove 114 is arranged on the fitting surface 116 and extends along the movement direction of the pressing plate 11. When the pressing plate 11 is connected with the bottom plate 12, the second convex rib 22 is located in the first groove 114, and the second convex rib 22 can abut against the bottom wall of the first groove 114. The bottom wall of the first groove 114 is used to squeeze the second convex rib 22 to reduce the gap between the second convex rib 22 and the electrode plate 25. The second convex rib 22 can also abut against the side wall of the first groove 114. The side wall of the first groove 114 is used to limit the movement of the second convex rib 22 relative to the bottom plate 12 along the length direction and the width direction of the welding tool 1 to improve the stability during welding, and facilitate the positioning of the welding position of the second convex rib 22 through the first groove 114, thereby shortening the positioning time of the second convex rib 22, which is beneficial to improving the positioning accuracy of the second convex rib 22 and improving the welding efficiency.

[0092] At the same time, the first groove 114 is connected to the first through hole 113, so that during the welding process of the assembly to be welded, at least a portion of the second rib 22 is always located in the first through hole 113, so that the first welding part can directly abut the second rib 22 through the first through hole 113, thereby further shortening the positioning time of the first welding part, which is conducive to further improving the positioning accuracy and improving the welding efficiency.

[0093] In addition, during the welding process of the assembly to be welded, the first groove 114 can reduce the possibility of displacement of the second rib 22 relative to the electrode plate 25 , which is beneficial to improving the welding quality between the second rib 22 and the electrode plate 25 .

[0094] In a specific embodiment, Figure 1 , Figure 2 and Figure 3As shown, one of the pressing plate 11 and the bottom plate 12 is provided with a slider 115, and the other is provided with a slide groove 121c, and the slider 115 is slidably connected to the slide groove 121c, so that the pressing plate 11 can move relative to the bottom plate 12 in the plane of the bottom plate 12.

[0095] In the embodiment of the present application, the pressing plate 11 and the bottom plate 12 are slidably connected by the cooperation of the slider 115 and the slide groove 121c, which is conducive to improving the stability and smoothness of the relative sliding between the two, so that the staff can push the pressing plate 11 more easily, thereby helping to reduce the difficulty of operation during the welding process, and more in line with the actual use requirements. At the same time, the cooperation between the slider 115 and the slide groove 121c can also play a limiting role, so that the pressing plate 11 can slide along a preset route, so that the welding position of the second convex rib 22 can be fixed by the first groove 114 of the pressing plate 11, so as to shorten the positioning time of the welding position of the second convex rib 22 and improve the welding efficiency.

[0096] In a specific embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the pressing plate 11 is provided with a slider 115 , and the bottom plate 12 is provided with a slide groove 121 c . Along the length and width directions of the welding tool 1 , the slide groove 121 c is located on one side of the welding area facing the edge of the bottom plate 12 .

[0097] The slide groove 121c includes a first section 121c1 and a second section 121c2. The first section 121c1 extends along the length direction of the welding tool 1, and the second section 121c2 extends along the width direction of the welding tool 1. The first section 121c1 is connected to the second section 121c2 and is perpendicular to each other.

[0098] The pressing plate 11 includes a first pressing plate 111 and a second pressing plate 112 . The first pressing plate 111 slides along the first section 121 c 1 , and the second pressing plate 112 slides along the second section 121 c 2 .

[0099] In the embodiment of the present application, the pressure plate 11 is provided with a slider 115, and the base plate 12 is provided with a slide groove 121c, and along the length direction and width direction of the welding tooling 1, the slide groove 121c is located on the side of the welding area facing the edge of the base plate 12, so that after the pressure plate 11 and the base plate 12 are slidably connected through the cooperation of the slider 115 and the slide groove 121c, the first groove 114 can be located in the welding area, thereby facilitating the positioning of the welding position of the second rib 22.

[0100] Among them, the pressure plate 11 includes a first pressure plate 111 and a second pressure plate 112, and the slide groove 121c includes a first section 121c1 and a second section 121c2. The first section 121c1 and the second section 121c2 are interconnected and perpendicular to each other, so that the first section 121c1 and the second section 121c2 can form an L-shaped slide groove 121c. When the first pressure plate 111 is connected with the first section 121c1, and the second pressure plate 112 is connected with the second section 121c2, the pressure plate 11 can simultaneously limit the movement of the first rib 21 in the plane of the welding area, so as to fix the welding position of the first rib 21.

[0101] Specifically, the pressing plate 11 includes at least two first pressing plates 111 and two second pressing plates 112, and the chute 121c includes at least two first sections 121c1 and two second sections 121c2. When the first section 121c1 and the second section 121c2 are both straight sections, the first section 121c1 and the second section 121c2 can enclose a rectangular chute 121c, and the two first pressing plates 111 are symmetrically distributed on the two first sections 121c1, and the two second pressing plates 112 are symmetrically distributed on the two second sections 121c2, so as to weld the first rib 21 and the electrode plate 25 at the same time, thereby further shortening the processing process and improving the welding efficiency.

[0102] In a specific embodiment, Figure 3 , Figure 4 and Figure 5 As shown, along the height direction of the welding tool 1, the base plate 12 has a first surface 121 and a second surface 122 that are arranged opposite to each other, the first surface 121 is provided with a second groove 121a, the second surface 122 is provided with a third groove 122a, the bottom wall of the second groove 121a is provided with a second through hole 123, and the second groove 121a and the third groove 122a are connected through the second through hole 123.

[0103] In the embodiment of the present application, the first rib 21 is located in the second groove 121a, and the first rib 21 can abut against the bottom wall of the second groove 121a. The bottom wall of the second groove 121a is used to support the first rib 21 to reduce the possibility of the first rib 21 detaching from the second groove 121a. The first rib 21 can also abut against the side wall of the second groove 121a. The side wall of the second groove 121a is used to limit the movement of the first rib 21 relative to the base plate 12 along the length and width directions of the welding tooling 1 to improve the stability during welding.

[0104] The second groove 121a and the third groove 122a are respectively arranged on the first surface 121 and the second surface 122 of the bottom plate 12 along the height direction of the welding tool 1, and the bottom wall of the second groove 121a and the bottom wall of the third groove 122a are connected through the second through hole 123. In the process of welding the assembly to be welded, the second welding part can be in contact with the first rib 21 through the third groove 122a and the second through hole 123 in sequence, so that the first welding part and the second welding part clamp the assembly to be welded along the height direction of the welding tool 1, and then the first welding part and the second welding part can melt and connect the mutually contacting surfaces between the first rib 21 and the electrode plate 25, and the second rib 22 and the electrode plate 25 into one body after the current is passed through the first welding part and the second welding part, so as to form a Figure 6 The monopolar plate 2.

[0105] Therefore, in this embodiment, by arranging the second groove 121a and the third groove 122a to be connected, the first rib 21 and the electrode plate 25, the second rib 22 and the electrode plate 25 can be processed at the same time, which is beneficial to shorten the production process of the monopolar plate 2 and further improve the production efficiency of the monopolar plate 2. At the same time, since the second through holes 123 are distributed at intervals on the bottom wall of the second groove 121a, the bottom wall between two adjacent second through holes 123 can support the first rib 21, which is beneficial to improve the stability and reliability during welding.

[0106] In a specific embodiment, Figure 3 and Figure 6 As shown, along the length direction and width direction of the welding tool 1, the second groove 121a is an annular structure.

[0107] In the embodiment of the present application, during the welding process of the assembly to be welded, a first rib 21 of an annular structure can be formed on one side of the electrode plate 25 through the second groove 121a of the annular structure. After the welding is completed to form the monopolar plate 2, a seal 3 of the annular structure can be accommodated between two adjacent first ribs 21 to improve the sealing performance of the electrolyzer or fuel cell.

[0108] The first convex rib 21 may be an annular structure corresponding to the second groove 121a. When the first convex rib 21 is an annular structure, the first convex rib 21 is an integrally formed structure, which can improve the structural stability of the first convex rib 21, thereby providing a more stable limiting and protective effect on the seal 3. At the same time, the welding steps between multiple sections of the first convex rib 21 in the same second groove 121a can be reduced, thereby further improving the welding efficiency. In addition, when the first convex rib 21 is an annular structure, the second convex rib 22 and the first convex rib 21 may be corresponding annular structures, so that the two can use the same processing technology, which is conducive to improving the production efficiency of the second convex rib 22 and the first convex rib 21.

[0109] Specifically, the second groove 121a and the first rib 21 can be a rectangular structure or a circular structure, so that the monopolar plate 2 can be suitable for electrolyzers or fuel cells of different shapes, which is beneficial to expand the application range of the monopolar plate 2 and make it have higher versatility.

[0110] In other embodiments, the first rib 21 may also be a segmented structure. When the first rib 21 is a segmented structure, multiple segments of the first rib 21 are located in the second groove 121a, and two adjacent first ribs 21 are abutted, which helps to reduce the processing difficulty of the first rib 21.

[0111] In a specific embodiment, Figure 5 As shown, along the height direction of the welding tool 1, the cross-sectional shape of the third groove 122a is trapezoidal or semicircular.

[0112] In the embodiment of the present application, along the height direction of the welding tool 1, the opening direction of the third groove 122a is toward the side away from the second groove 121a. When the cross-sectional shape of the third groove 122a is a trapezoidal structure or a semicircular structure, the third groove 122a has an enlarged accommodation space for accommodating the second welding part to avoid interference between the second welding part and the bottom plate 12, thereby shortening the distance between the second welding part and the bottom wall of the third groove 122a, which is conducive to better achieving the abutment between the second welding part and the first convex rib 21. At the same time, when the cross-sectional shape of the third groove 122a is a trapezoidal structure or a semicircular structure, the side wall of the third groove 122a can play a guiding role to improve the matching efficiency between the second welding part and the first convex rib 21.

[0113] In a specific embodiment, Figure 3 , Figure 4 and Figure 5 As shown, the first surface 121 is also provided with a fourth groove 121b. Along the length direction and width direction of the welding tool 1, the fourth groove 121b is located on the side of the second groove 121a away from the edge of the base plate 12 and is connected with the second groove 121a, and along the height direction of the welding tool 1, the bottom wall of the fourth groove 121b is provided with a second through hole 123, and the fourth groove 121b and the third groove 122a are connected through the second through hole 123, and the second groove 121a, the third groove 122a and the fourth groove 121b form the above-mentioned welding area.

[0114] In the embodiment of the present application, the assembly to be welded further includes a third rib 23, and the fourth groove 121b is used to accommodate the third rib 23. When the third rib 23 is located in the fourth groove 121b, the third rib 23 can abut against the bottom wall of the fourth groove 121b, and the bottom wall of the fourth groove 121b is used to support the third rib 23 to reduce the possibility of the third rib 23 being separated from the fourth groove 121b. The third rib 23 can also abut against the side wall of the fourth groove 121b, and the side wall of the fourth groove 121b is used to limit the movement of the third rib 23 relative to the bottom plate 12 along the length direction and the width direction of the welding tool 1 to improve the stability during welding. And when the third rib 23 is placed in the fourth groove 121b, along the height direction of the welding tool 1, the upper surface of the third rib 23 is flush with the upper surface of the fourth groove 121b (i.e., the fitting surface 116) to ensure the flatness of the welding area facing the pressure plate 11, thereby ensuring the flatness of the electrode 25 after being placed in the welding area, which is beneficial to improving the overall welding quality.

[0115] Among them, the first surface 121 is provided with at least two fourth grooves 121b, and at least two fourth grooves 121b are spaced apart along the length direction and the width direction of the welding tool 1, so that after the assembly to be welded is welded to form a single-pole plate 2, one side of the polar plate 25 has two spaced apart third ribs 23, so that there is an accommodating space for accommodating the seal 3 between two adjacent third ribs 23, so that in the subsequent lamination process, the two adjacent third ribs 23 can limit the seal 3, reduce the possibility of displacement or crushing of the seal 3, thereby improving the pressure resistance of the seal 3, and then improving the sealing of the electrolyzer or fuel cell.

[0116] At the same time, along the length and width directions of the welding tool 1, the fourth groove 121b is located on the side of the second groove 121a away from the edge of the base plate 12 and is connected to the second groove 121a, so that the third rib 23 and the first rib 21 can be an integrally formed structure, which is beneficial to improve the production efficiency of both, improve the stability and reliability of the connection between the third rib 23 and the first rib 21, and reduce the welding steps between the third rib 23 and the first rib 21, thereby further improving the welding efficiency.

[0117] In addition, the bottom wall of the fourth groove 121b is also provided with the second through hole 123, and the fourth groove 121b and the third groove 122a are connected through the second through hole 123, so that the second groove 121a, the third groove 122a and the fourth groove 121b form the welding area.

[0118] Specifically, the fourth groove 121b and the third groove 122a are respectively arranged on the first surface 121 and the second surface 122 of the bottom plate 12 along the height direction of the welding tool 1, and the bottom wall of the fourth groove 121b and the bottom wall of the third groove 122a are connected through the second through hole 123. In the process of welding the assembly to be welded, the second welding part can be in contact with the third convex rib 23 through the third groove 122a and the second through hole 123 in sequence, so that the first welding part and the second welding part clamp the assembly to be welded along the height direction of the welding tool 1, and then the first welding part and the second welding part can melt and connect the surfaces of the third convex rib 23 and the electrode plate 25 that are in contact with each other after the current is passed through them, so as to form a Figure 6 The monopolar plate 2.

[0119] More specifically, the assembly to be welded also includes a fourth rib 24. Along the height direction of the welding tool 1, the fourth rib 24 and the second rib 22 are located on the same side of the electrode plate 25 and are connected to the second rib 22, and the projection of the fourth rib 24 overlaps or is misaligned with the projection of the third rib 23.

[0120] The fourth rib 24 can be an integrally formed structure with the second rib 22, which is conducive to improving the production efficiency of the two, improving the stability and reliability of the connection between the fourth rib 24 and the second rib 22, reducing the welding steps between the fourth rib 24 and the second rib 22, and improving the welding efficiency. In the process of welding the fourth rib 24, the welding position of the fourth rib 24 can be determined as the second rib 22 is fixed, and the fourth rib 24 does not need to be positioned by the pressing plate 11. When the first welding part abuts against the fourth rib 24, it can provide a certain pressure, and can still squeeze out the impurities and gas between the fourth rib 24 and the electrode plate 25, thereby ensuring the welding quality between the fourth rib 24 and the electrode plate 25.

[0121] At the same time, the projections of the fourth rib 24 and the third rib 23 can overlap or be misaligned in the height direction of the welding tool 1. After the welding is completed to form the monopolar plate 2, the seal 3 between two adjacent fourth ribs 24 and the seal 3 between two adjacent third ribs 23 overlap or be misaligned in the height direction of the welding tool 1, so that the monopolar plate 2 can be suitable for an electrolyzer or a fuel cell, which is beneficial to expand the application range of the monopolar plate 2 and make it have higher versatility.

[0122] In addition, in the process of welding the assembly to be welded, it is only necessary to adjust the welding position of the fourth rib 24 so that the fourth rib 24 and the third rib 23 can overlap or be misaligned in the height direction of the welding tool 1, thereby achieving adjustment of the application field of the monopolar plate 2, without replacing the welding tool 1, which is beneficial to improving the versatility of the welding tool 1, and in the process of producing the fourth rib 24 and the second rib 22, it is only necessary to adjust the size relationship between the fourth rib 24 and the second rib 22 to achieve the change of the welding position of the fourth rib 24. This method is not only beneficial to reducing production costs, but also easy to operate, and more in line with actual production needs.

[0123] Therefore, in this embodiment, by arranging the fourth groove 121b and the third groove 122a to be connected, the third rib 23 and the electrode plate 25, and the fourth rib 24 and the electrode plate 25 can be processed at the same time, which is beneficial to shortening the production process of the monopolar plate 2 and further improving the production efficiency of the monopolar plate 2. At the same time, since the second through holes 123 are distributed at intervals on the bottom wall of the fourth groove 121b, the bottom wall between two adjacent second through holes 123 can support the third rib 23, which is beneficial to improving the stability and reliability during welding.

[0124] In a specific embodiment, Figure 5 As shown, a reinforcing rib 124 is provided between two adjacent second through holes 123 along the length direction and the width direction of the welding tool 1 .

[0125] In the embodiment of the present application, the reinforcing rib 124 can improve the structural strength of the bottom wall of the second groove 121a and the fourth groove 121b, reduce the possibility of the bottom wall collapsing or breaking due to excessive pressure on the first convex rib 21, thereby improving the supporting capacity of the first convex rib 21 and improving the service life of the bottom plate 12.

[0126] In a possible implementation manner, the reinforcing rib 124 may serve as the bottom wall of the second groove 121 a and the fourth groove 121 b .

[0127] In a specific implementation, along the length direction and the width direction of the welding tool 1 , the distance between two adjacent second through holes 123 is L, and L satisfies 2mm≤L≤20mm.

[0128] In the embodiment of the present application, the distance L between two adjacent second through holes 123 can be 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, etc.

[0129] When the distance between two adjacent second through holes 123 is too small (for example, L is less than 2 mm), the second through holes 123 are too densely distributed in the area, which may easily lead to an excessive number of welds in the area, making the structural strength of the bottom wall of the second groove 121a or the bottom wall of the fourth groove 121b too low. During welding or subsequent lamination of the monopolar plate 2, the bottom wall of the area may collapse or break, thereby affecting the safety and reliability of the processing process.

[0130] When the distance between two adjacent second through holes 123 is too large (for example, L is greater than 20 mm), the second through holes 123 are too sparsely distributed in the area, which may easily lead to too few welding points in the area, resulting in too low welding quality between the first rib 21 and the electrode plate 25 or the third rib 23 and the electrode plate 25. In the subsequent lamination process of the monopolar plate 2, the seal 3 cannot be effectively limited and protected.

[0131] Therefore, when the distance between two adjacent second through holes 123 satisfies 2mm≤L≤20mm, the distribution of the second through holes 123 in the area is moderate and the number of welding points is moderate, which is beneficial to improve the structural strength of the bottom wall of the second groove 121a or the bottom wall of the fourth groove 121b while ensuring that the first rib 21 and the electrode plate 25 or the third rib 23 and the electrode plate 25 have higher welding quality.

[0132] In a specific embodiment, Figure 3 As shown, the bottom plate 12 is provided with a third through hole 125 . Along the length direction and the width direction of the welding tool 1 , the third through hole 125 is located on a side of the welding area away from the edge of the bottom plate 12 .

[0133] In the embodiment of the present application, the third through hole 125 can be located at the center of the base plate 12, and is used to connect the first surface 121 and the second surface 122 of the base plate 12, so as to reduce the input of raw materials during the production of the base plate 12, thereby reducing the production cost of the base plate 12 while reducing the weight of the base plate 12, so as to achieve lightweight welding tooling 1, thereby facilitating transportation and better meeting actual production needs.

[0134] There may be one or more third through holes 125 .

[0135] The embodiment of the present application further provides a welding method for a monopolar plate, which uses any of the welding tools 1 described above to weld the first rib 21, the second rib 22, the third rib 23 and the fourth rib 24 to the plate 25. The welding method includes:

[0136] The first convex rib 21, the second convex rib 22, the third convex rib 23, the fourth convex rib 24 and the electrode plate 25 are placed in the welding area; the electrode plate 25 and the first convex rib 21, the electrode plate 25 and the second convex rib 22 are welded through the first through hole 113 and the second through hole 123; the electrode plate 25 and the third convex rib 23, the electrode plate 25 and the fourth convex rib 24 are welded through the second through hole 123 to form a monopolar plate 2.

[0137] In the embodiment of the present application, the pressing plate 11 and the bottom plate 12 are distributed along the height direction of the welding tool 1, and the bottom plate 12 has a welding area on the side facing the pressing plate 11, and the welding area is used to place the components to be welded (i.e., the first convex rib 21, the second convex rib 22, the third convex rib 23, the fourth convex rib 24 and the electrode plate 25). When the components to be welded are placed in the welding area, the pressing plate 11 and the bottom plate 12 can clamp the components to be welded along the height direction of the welding tool 1 to reduce the possibility of relative movement between the components to be welded and improve the safety during welding.

[0138] The pressing plate 11 has a first through hole 113 for accommodating a first welding portion of the welding device, and the bottom plate 12 has a second through hole 123 for accommodating a second welding portion of the welding device.

[0139] During the welding process of the first convex rib 21, the second convex rib 22 and the pole plate 25, the first welding portion can abut against the second convex rib 22 through the first through hole 113, and the second welding portion can abut against the first convex rib 21 through the second through hole 123, and generate heat to form a high temperature after the current is passed through, so that the contact surfaces between the first convex rib 21 and the pole plate 25 and the contact surfaces between the second convex rib 22 and the pole plate 25 can melt and connect into one in a high temperature environment, thereby realizing the preliminary welding of the components to be welded.

[0140] During the welding process of the third rib 23, the fourth rib 24 and the pole plate 25, the first welding portion can directly abut against the fourth rib 24, and the second welding portion can abut against the third rib 23 through the second through hole 123, and generate heat to form a high temperature after the current is passed through, so that the contact surfaces between the third rib 23 and the pole plate 25 and the contact surfaces between the fourth rib 24 and the pole plate 25 can melt and connect into one in a high temperature environment, thereby realizing the welding of the components to be welded to form a single pole plate 2.

[0141] Therefore, in this embodiment, the welding equipment can perform resistance spot welding on the assembly to be welded through the first through hole 113 of the pressure plate 11 and the second through hole 123 of the base plate 12, thereby eliminating the need for laser welding and the need to set a protective gas, which is beneficial for reducing the possibility of defects such as cracks and pores at the weld, improving welding quality and welding efficiency, and reducing the production cost of the monopolar plate 2.

[0142] In a specific embodiment, when the first rib 21, the second rib 22, the third rib 23, the fourth rib 24 and the electrode plate 25 are placed in the welding area, the welding method includes:

[0143] Place the first rib 21 in the second groove 121a, and place the third rib 23 in the fourth groove 121b; cover the electrode 25 on the first rib 21 and the third rib 23; place the second rib 22 and the fourth rib 24 on the electrode 25, so that the first rib 21 and the third rib 23, the second rib 22 and the fourth rib 24 are located on both sides of the electrode 25 along the thickness direction; match and connect the pressing plate 11 with the bottom plate 12, and make the second rib 22 located in the first groove 114.

[0144] In the embodiment of the present application, along the height direction of the welding tooling 1, the side of the base plate 12 facing the pressure plate 11 also has a slide groove 121c, and the slide groove 121c is an annular structure. Along the length direction and width direction of the welding tooling 1, the above-mentioned welding area is located in the slide groove 121c, and the welding area is separated from the slide groove 121c by a limiting portion (not marked in the figure).

[0145] Specifically, along the length direction and the width direction of the welding tool 1, the side of the limiting portion facing the inside of the slide groove 121c is the side wall of the slide groove 121c, and the side of the limiting portion facing the welding area is the side wall of the welding area.

[0146] In the process of placing the components to be welded, the first rib 21 and the third rib 23 are first placed in the second groove 121a and the fourth groove 121b respectively, and the upper surface of the first rib 21 is flush with the upper surface of the second groove 121a, and the upper surface of the third rib 23 is flush with the upper surface of the fourth groove 121b, so as to ensure the flatness of the welding area facing the side of the pressure plate 11, thereby ensuring the flatness of the electrode 25 after being placed in the welding area, which is beneficial to improve the overall welding quality.

[0147] When the electrode plate 25 is placed in the welding area, the electrode plate 25 covers the first convex rib 21 and the third convex rib 23, and the edge of the electrode plate 25 can abut against the limiting portion (i.e., the side wall of the welding area) to reduce the possibility of the electrode plate 25 moving relative to the bottom plate 12 within the plane of the bottom plate 12, thereby improving the stability of the electrode plate 25 when placed.

[0148] When the second rib 22 and the fourth rib 24 are placed on the electrode plate 25, the first rib 21 and the third rib 23, the second rib 22 and the fourth rib 24 are located on both sides of the electrode plate 25 along its thickness direction, so that after the assembly to be welded is welded to form a monopolar plate 2, both sides of the monopolar plate 2 have ribs for accommodating the seal 3, so as to play a limiting and protective role for the seal 3 during the subsequent lamination process, thereby improving the sealing of the electrolyzer or fuel cell.

[0149] When the pressing plate 11 and the bottom plate 12 are slidably connected by the cooperation of the slider 115 and the slide groove 121c, the fitting surface 116 of the pressing plate 11 fits not only the upper surface of the limiting portion but also the upper surface of the electrode 25, and the second convex rib 22 is located in the first groove 114 of the pressing plate 11, so that the welding position of the second convex rib 22 is fixed by the first groove 114 of the pressing plate 11, so as to shorten the positioning time of the welding position of the second convex rib 22 and improve the welding efficiency. At the same time, the projection of the second convex rib 22 and the first convex rib 21 along the height direction of the welding tool 1 overlap, so that in the process of welding the assembly to be welded, the first convex rib 21 and the electrode 25, and the second convex rib 22 and the electrode 25 can be welded at the same time, which is conducive to improving the welding efficiency. At the same time, the overlap of the projections can also improve the consistency of the welding positions of the first convex rib 21 and the second convex rib 22, which is conducive to improving the yield rate of the monopolar plate 2.

[0150] Among them, the second groove 121a and the fourth groove 121b are connected, and along the length direction and width direction of the electrode plate 25, the third rib 23 is located on the side of the first rib 21 away from the edge of the electrode plate 25, and is connected to the first rib 21, and the fourth rib 24 is located on the side of the second rib 22 away from the edge of the electrode plate 25, and is connected to the second rib 22, so that the third rib 23 and the first rib 21 can be an integrally formed structure, and the fourth rib 24 can be an integrally formed structure with the second rib 22, which is beneficial to improving the production efficiency of the ribs, improving the stability and reliability of the connection between the third rib 23 and the first rib 21 and between the fourth rib 24 and the second rib 22, reducing the welding steps, and improving the welding efficiency.

[0151] In a specific embodiment, when the electrode plate 25 and the third rib 23, and the electrode plate 25 and the fourth rib 24 are welded through the second through hole 123, the welding method includes:

[0152] The pressing plate 11 is released from the bottom plate 12 ; and the electrode plate 25 and the third rib 23 , and the electrode plate 25 and the fourth rib 24 are welded through the second through hole 123 .

[0153] In the embodiment of the present application, after the first rib 21, the second rib 22 and the electrode plate 25 are welded, in the process of welding the third rib 23, the fourth rib 24 and the electrode plate 25, since the welding position of the fourth rib 24 can be determined as the second rib 22 is fixed, there is no need to position the fourth rib 24 through the pressing plate 11, and the first welding portion can provide a certain pressure when abutting against the fourth rib 24, and can still squeeze out the impurities and gas between the fourth rib 24 and the electrode plate 25, thereby ensuring the welding quality between the fourth rib 24 and the electrode plate 25. Therefore, the first welding portion can directly abut against the fourth rib 24, and the second welding portion can abut against the third rib 23 through the second through hole 123, and generate heat to form a high temperature after the current is passed, so that the surfaces of the third rib 23 and the electrode plate 25 in contact with each other and the surfaces of the fourth rib 24 and the electrode plate 25 in contact with each other can be melted and connected into one in a high temperature environment, thereby realizing the welding of the components to be welded to form a monopolar plate 2.

[0154] The embodiment of the present application also provides a monopolar plate, which is made by any of the welding methods described above, such as Figure 6 and Figure 7 As shown, the monopolar plate 2 includes a first convex rib 21, a second convex rib 22, a third convex rib 23, a fourth convex rib 24 and a pole plate 25. Along the thickness direction of the monopolar plate 2, the first convex rib 21 and the third convex rib 23, the second convex rib 22 and the fourth convex rib 24 are respectively connected to the two sides of the pole plate 25, and the projections of the first convex rib 21 and the second convex rib 22 overlap, and the projections of the third convex rib 23 and the fourth convex rib 24 overlap or are misaligned.

[0155] In the embodiment of the present application, the first rib 21 and the second rib 22 are both annular structures, and along the length and width directions of the electrode plate 25, the third rib 23 is located on the side of the first rib 21 away from the edge of the electrode plate 25 and is connected to the first rib 21, and the fourth rib 24 is located on the side of the second rib 22 away from the edge of the electrode plate 25 and is connected to the second rib 22.

[0156] The monopolar plate 2 includes at least two first ribs 21 and two second ribs 22, and an annular space for accommodating a first seal (not shown in the figure) can be formed between two adjacent first ribs 21 and between two adjacent second ribs 22. The first seal is used to isolate the reaction area of ​​the monopolar plate 2 from the external environment to avoid the risk of leakage of the electrolyzer or fuel cell during operation, thereby helping to improve the safety and reliability of the electrolyzer or fuel cell during operation. In the thickness direction of the monopolar plate 2, the projections of the first rib 21 and the second rib 22 overlap, so that the monopolar plate 2 can form a one-plate two-field structure, which is conducive to reducing the overall volume of the electrolyzer or fuel cell, thereby reducing production costs.

[0157] At the same time, the monopolar plate 2 also includes at least two third ribs 23 and two fourth ribs 24, and a space for accommodating a second seal (not shown in the figure) can be formed between two adjacent third ribs 23 and between two adjacent second ribs 22. The second seal is used to isolate the cavity area and the flow field area in the monopolar plate 2, as well as two adjacent cavity areas, so as to avoid the risk of cross-flow of fluids in different cavity areas during the operation of the electrolyzer or fuel cell, thereby facilitating the improvement of the safety and reliability of the electrolyzer or fuel cell during the operation. In the thickness direction of the monopolar plate 2, the projections of the third rib 23 and the fourth rib 24 overlap or are misaligned, so that the monopolar plate 2 can be applied to the electrolyzer or fuel cell, which is conducive to expanding the application range of the monopolar plate 2 and making it more versatile.

[0158] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A welding tool, used for welding components to be welded, wherein the welding method of the components to be welded is resistance spot welding, characterized in that: The welding tool comprises: A pressing plate, the pressing plate having a first through hole, wherein the first through hole is used to accommodate a first welding portion of a welding device; A bottom plate, the bottom plate having a welding area, the welding area having a plurality of second through holes, the plurality of second through holes being spaced apart along the length direction and the width direction of the welding tool, the second through holes being used to accommodate a second welding portion of the welding device; The pressing plate is slidably connected to the bottom plate, and during the movement of the pressing plate relative to the bottom plate, the projection of the second through hole along the height direction of the welding tool is located within the projection range of the first through hole, and the first welding part and the second welding part clamp the assembly to be welded through the first through hole and the second through hole respectively; The pressing plate is provided with a sliding block, the bottom plate is provided with a sliding groove, the sliding groove is located on a side of the welding area facing the edge of the bottom plate, and the sliding block is slidably connected with the sliding groove; The pressing plate includes a first pressing plate and a second pressing plate, the sliding groove includes a first section and a second section, the first pressing plate slides along the first section, and the second pressing plate slides along the second section.

2. The welding tool according to claim 1, characterized in that: The pressing plate includes at least two first grooves, the welding area includes at least two second grooves, at least two of the second grooves are spaced apart along the length direction and the width direction of the welding tool, and the projection of each of the second grooves and each of the first grooves along the height direction of the welding tool overlaps; The second groove is used to accommodate the first convex rib of the component to be welded, and the first groove is used to accommodate the second convex rib of the component to be welded.

3. The welding tool according to claim 2, characterized in that: The first groove extends along the moving direction of the pressing plate and is connected to the first through hole. The first groove is rectangular or arc-shaped.

4. The welding tool according to claim 2, characterized in that: Along the height direction of the welding tool, the base plate has a first surface and a second surface arranged opposite to each other, the first surface is provided with the second groove, the second surface is provided with the third groove, the bottom wall of the second groove is provided with the second through hole, and the second groove and the third groove are connected through the second through hole.

5. The welding tool according to claim 4, characterized in that: Along the length direction and width direction of the welding tool, the second groove is an annular structure.

6. The welding tool according to claim 4, characterized in that: Along the height direction of the welding tool, the cross-sectional shape of the third groove is trapezoidal or semicircular.

7. The welding tool according to claim 4, characterized in that: The first surface is further provided with a fourth groove, and along the length direction and the width direction of the welding tool, the fourth groove is located on the side of the second groove away from the edge of the bottom plate and is connected to the second groove, and in the height direction of the welding tool, the bottom wall of the fourth groove is provided with the second through hole, and the fourth groove and the third groove are connected through the second through hole; The second groove, the third groove, and the fourth groove form the welding area.

8. The welding tool according to any one of claims 1 to 7, characterized in that: The first section extends along the length direction of the welding tool, the second section extends along the width direction of the welding tool, and the first section is connected to and perpendicular to the second section.

9. The welding tool according to any one of claims 1 to 7, characterized in that: A reinforcing rib is provided between two adjacent second through holes along the length direction and the width direction of the welding tool.

10. The welding tool according to any one of claims 1 to 7, characterized in that: Along the length direction and the width direction of the welding tool, the distance between two adjacent second through holes is L, and L satisfies 2mm≤L≤20mm.

11. The welding tool according to any one of claims 1 to 7, characterized in that: The bottom plate is provided with a third through hole, and along the length direction and the width direction of the welding tool, the third through hole is located on a side of the welding area away from the edge of the bottom plate.

12. A method for welding a monopolar plate, using the welding tool as claimed in any one of claims 1 to 11 for welding, wherein the welding method is resistance spot welding, and is used to weld a first convex rib, a second convex rib, a third convex rib and a fourth convex rib to the plate, characterized in that: The welding method comprises: Placing the first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the electrode plate in the welding area; Welding the electrode plate and the first rib, and welding the electrode plate and the second rib through the first through hole and the second through hole; The polar plate and the third rib, and the polar plate and the fourth rib are welded through the second through hole to form the monopolar plate.

13. The welding method according to claim 12, characterized in that: The pressing plate is provided with a first groove, the bottom plate is provided with a second groove and a fourth groove, when the first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the electrode plate are placed in the welding area, the welding method includes: Placing the first convex rib in the second groove, and placing the third convex rib in the fourth groove; Covering the electrode plate on the first convex rib and the third convex rib; Placing the second convex rib and the fourth convex rib on the electrode plate so that the first convex rib and the third convex rib, the second convex rib and the fourth convex rib are located on both sides of the electrode plate along the thickness direction thereof; The pressing plate is connected with the bottom plate in a matching manner, and the second convex rib is located in the first groove; Among them, the second groove is connected to the fourth groove, and along the length direction and width direction of the electrode plate, the third rib is located on the side of the first rib away from the edge of the electrode plate and is connected to the first rib, and the fourth rib is located on the side of the second rib away from the edge of the electrode plate and is connected to the second rib.

14. The welding method according to claim 13, characterized in that: When the electrode plate and the third rib, and the electrode plate and the fourth rib are welded through the second through hole, the welding method includes: disengaging the pressing plate from the bottom plate; The electrode plate and the third rib, and the electrode plate and the fourth rib are welded through the second through hole.

15. A monopolar plate, manufactured by the welding method according to any one of claims 12 to 14, characterized in that: The monopolar plate comprises a first convex rib, a second convex rib, a third convex rib, a fourth convex rib and a polar plate; Along the thickness direction of the monopolar plate, the first convex rib and the third convex rib, the second convex rib and the fourth convex rib are respectively connected to both sides of the polar plate, and along the length direction and width direction of the monopolar plate, the third convex rib is located on the side of the first convex rib away from the edge of the polar plate and is connected to the first convex rib, and the fourth convex rib is located on the side of the second convex rib away from the edge of the polar plate and is connected to the second convex rib; Wherein, along the thickness direction of the monopolar plate, the projections of the first convex rib and the second convex rib overlap, and the projections of the third convex rib and the fourth convex rib overlap or are misaligned.

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