Bipolar plate welding clamp

Abstract

The utility model provides a bipolar plate welding fixture. The bipolar plate welding fixture comprises a bottom plate; the bipolar plate is pressed between the bottom plate and the pressing plate, the bottom plate and / or the pressing plate are / is provided with an air blowing channel, the bottom plate is provided with a lower air blowing port communicated with the air blowing channel, the pressing plate is provided with an upper air blowing port communicated with the air blowing channel, and the upper air blowing port is communicated with the air blowing channel. And the lower air blowing ports and the upper air blowing ports are arranged towards the bonding wires of the adjacent bipolar plates. According to the utility model, the cooling and oxygen dilution of the upper and lower side surfaces of the welding wire or welding spot area of the bipolar plate can be realized, the condition that the welding wire or welding spot area becomes yellow or blue due to oxidation can be effectively prevented, and the welding quality is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell bipolar plate welding, in particular to a bipolar plate welding fixture. Background Art

[0002] Bipolar plates are an important part of hydrogen fuel cells, including cathode and anode plates. The structure composed of the two is called a bipolar plate. In conventional technology, the cathode and anode plates are laser welded to ensure that the inner cavity of the bipolar plate has good airtightness. However, due to the high laser energy during the welding process, the welding line or welding point area of ​​the bipolar plate will turn yellow or blue due to high-temperature oxidation, affecting the welding quality of the product. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a bipolar plate welding fixture, which can realize cooling and oxygen dilution on the upper and lower sides of the bipolar plate welding line or welding point area, and can effectively prevent the welding line or welding point area from turning yellow or bluish due to oxidation, thereby ensuring the welding quality.

[0004] The embodiments of the present invention are implemented by the following technical solutions:

[0005] A bipolar plate welding fixture comprises: a base plate; a pressure plate, wherein the bipolar plate is pressed between the base plate and the pressure plate, wherein the base plate and / or the pressure plate are provided with a blowing channel, the base plate is provided with a lower blowing port connected to the blowing channel, the pressure plate is provided with an upper blowing port connected to the blowing channel, and the lower blowing port and the upper blowing port are both arranged toward the welding line of the adjacent bipolar plate.

[0006] According to a preferred embodiment, a lower avoidance groove corresponding to the welding line is provided on a side surface of the bottom plate facing the pressing plate, and the lower air outlet is connected to the lower avoidance groove.

[0007] According to a preferred embodiment, the welding wire includes a main welding wire; the pressure plate includes an outer frame plate and an inner main board, the inner main board is sleeved in the outer frame plate, at least part of the main welding wire corresponds to the first gap formed between the outer frame plate and the inner main board; there are multiple upper air blowing ports, at least part of the upper air blowing ports are arranged on the outer frame plate, and the upper air blowing ports are arranged toward the first gap.

[0008] According to a preferred embodiment, the welding line also includes a first auxiliary welding line, which intersects with the main welding line; the pressure plate also includes an inner auxiliary plate, which is sleeved in the outer frame plate and located between the inner main plate and the outer frame plate, at least part of the first auxiliary welding line corresponds to the second gap formed between the inner auxiliary plate and the inner main plate, and at least part of the main welding line corresponds to the third gap formed between the inner auxiliary plate and the outer frame plate; at least part of the upper air port is arranged on the inner auxiliary plate, and part of the upper air port is arranged toward the second gap; and / or part of the upper air port is arranged toward the third gap.

[0009] According to a preferred embodiment, the bipolar plate welding fixture also includes an electromagnetic suction cup, wherein: the base plate is arranged on the working surface of the electromagnetic suction cup; the pressure plate is arranged on the side of the base plate away from the electromagnetic suction cup, and the pressure plate can have a movement tendency toward the base plate under the action of the electromagnetic suction cup.

[0010] According to a preferred embodiment, a plurality of magnetic pillars are embedded in the bottom plate; and the area on the pressing plate corresponding to the magnetic pillars is magnetic.

[0011] According to a preferred embodiment, the pressing plate is an integrated structure and is made of a light-transmitting material.

[0012] According to a preferred embodiment, the bipolar plate welding fixture further includes an air guide block, the air guide block has an air guide groove; the air blowing channel has a plurality of air inlets, and the plurality of air inlets are connected to the air guide groove.

[0013] According to a preferred embodiment, an annular sealing groove is provided on the bottom plate and / or the pressure plate, and the bipolar plate is located in an area defined by the annular sealing groove.

[0014] According to a preferred embodiment, an upper protrusion is arranged on one side surface of the pressure plate facing the bottom, and a lower protrusion corresponding to the upper protrusion is arranged on one side surface of the bottom plate facing the pressure plate; the upper protrusion and the lower protrusion are arranged close to the welding wire; and the bipolar plate is pressed between the upper protrusion and the lower protrusion.

[0015] According to a preferred embodiment, welding spots are preset on the bipolar plates, welding holes are penetrated through the pressure plates, and the welding holes correspond to the welding spots; an upper supporting protrusion is arranged on one side of the pressure plate facing the base plate, and a plurality of the upper supporting protrusions are arranged around the welding holes; a plurality of lower supporting protrusions corresponding to the plurality of upper supporting protrusions are arranged on one side of the base plate facing the pressure plate, and an air guiding gap is provided between two adjacent upper supporting protrusions and two adjacent lower supporting protrusions; the air guiding gap is connected to the air blowing channel.

[0016] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0017] The utility model presses nitrogen into the blowing channel, and this part of nitrogen flows to the upper and lower sides of the bipolar plate through the upper blowing port and the lower blowing port, and specifically flows to the bipolar plate welding line area. On the one hand, the gas flow rate in the area is increased to achieve cooling of the upper and lower sides of the bipolar plate welding line area, and at the same time reduce the oxygen content in the area, so that the yellowing or bluing of the bipolar plate welding line area due to oxidation during the laser welding process can be suppressed to a great extent, thereby ensuring the welding quality of the bipolar plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a bipolar plate welding fixture provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the exploded structure of the bipolar plate welding fixture provided in an embodiment of the utility model;

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of the structure at J in the middle;

[0022] Figure 4 A schematic diagram of the top view of the bipolar plate welding fixture provided by the new embodiment of the utility model after the electromagnetic chuck is removed;

[0023] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the AA section;

[0024] Figure 6 for Figure 5 A partial enlarged schematic diagram of the structure at K in the middle;

[0025] Figure 7 for Figure 4 Schematic diagram of the cross-sectional structure of the middle BB section;

[0026] Figure 8 for Figure 7 A partial enlarged schematic diagram of the structure at L in the middle;

[0027] Fig. 9A schematic diagram of the three-dimensional structure of the outer frame plate provided in an embodiment of the utility model;

[0028] Fig.10 A schematic diagram of the three-dimensional structure of the inner main board provided by an embodiment of the utility model;

[0029] Fig.11 A schematic diagram of the three-dimensional structure of the inner sub-plate provided in an embodiment of the utility model;

[0030] Fig.12 A schematic diagram of the top view of a bipolar plate provided in an embodiment of the utility model.

[0031] Icons: 100, welding fixture; 110, electromagnetic suction cup; 120, pressing plate; 121, outer frame plate; 1211, upper sealing ring convex; 1212, upper convex; 1213, first upper air blowing port; 122, inner sub-plate; 1221, third upper air blowing port; 123, inner main plate; 1231, second upper air blowing port; 1232, welding hole; 1233, upper supporting convex; 124, positioning hole; 130, bottom plate; 131, air blowing channel; 132, lower avoidance groove; 133, lower sealing ring convex; 1331, annular sealing groove; 1332, sealing strip; 134, lower air outlet; 135, lower protrusion; 136, magnetic column; 137, lower supporting protrusion; 138, positioning pin; 140, air guide block; 141, air nozzle; 142, air guide groove; 200, bipolar plate; 201, main welding line; 202, first secondary welding line; 203, material port; 204, welding point; 210, reaction zone; 220, edge sealing zone; 230, hole zone; a, first gap; b, second gap; c, third gap. DETAILED DESCRIPTION

[0032] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] A bipolar plate welding fixture 100 is used for Fig.12 The bipolar plate 200 shown in the figure is welded. Specifically, the bipolar plate 200 is in the shape of a rectangular plate, and a material port 203 is provided at the end in the length direction thereof to form a channel for hydrogen and oxygen to be input into the bipolar plate 200. In this embodiment, the preset welding line track on the bipolar plate 200 is Fig.12 As shown by the dotted lines in the figure, the welding wires include a main welding wire 201 extending along the edge of the bipolar plate 200 in a closed ring structure, and a first secondary welding wire 202 intersecting the main welding wire 201 and cooperating with the main welding wire 201 to surround the material opening 203. During the laser welding process, the welding wire area on the bipolar plate 200 is easily oxidized to cause yellowing or bluing, which affects the welding quality. To this end, this embodiment provides a bipolar plate welding fixture 100.

[0036] Please refer to Figures 1 to 11 A bipolar plate welding fixture 100 includes a base plate 130 and a pressing plate 120, wherein a bipolar plate 200 is pressed between the base plate 130 and the pressing plate 120, wherein a blowing channel 131 is arranged between the base plate 130 and the pressing plate 120 and / or on the base plate 130 and / or on the pressing plate 120, a lower blowing port 134 connected to the blowing channel 131 is arranged on the base plate 130, an upper blowing port connected to the blowing channel 131 is arranged on the pressing plate 120, and both the lower blowing port 134 and the upper blowing port are arranged toward the welding line of the adjacent bipolar plate 200.

[0037] The bottom plate 130 is used to support the bipolar plate 200 , and the pressing plate 120 is used to cooperate with the bottom plate 130 to press the bipolar plate 200 , so as to fix the bipolar plate 200 between the bottom plate 130 and the pressing plate 120 .

[0038] In order to avoid the yellowing or bluing oxidation phenomenon of the weld line area of ​​the bipolar plate 200 due to high temperature during the laser welding process and ensure the welding quality of the bipolar plate 200, in this embodiment, nitrogen is pressed into the blowing channel 131, and this part of the nitrogen flows to the upper and lower sides of the bipolar plate 200 through the upper blowing port and the lower blowing port 134, specifically flows to the weld line area of ​​the bipolar plate 200, on the one hand, the gas flow rate in the area is increased, the upper and lower sides of the weld line area of ​​the bipolar plate 200 are cooled, and the oxygen content in the area is reduced, so that the yellowing or bluing of the weld line area of ​​the bipolar plate 200 due to oxidation during the laser welding process can be suppressed to a great extent, and the welding quality of the bipolar plate 200 is ensured; at the same time, the setting of the lower blowing port 134 and the upper blowing port can make the weld line area of ​​the bipolar plate 200 be continuously cooled during the welding process, which is conducive to the rapid cooling of the weld line area of ​​the bipolar plate and reduces the thermal deformation of the bipolar plate 200 caused by welding.

[0039] A lower sealing ring protrusion 133 and a lower protrusion 135 are provided on one side of the bottom plate 130 facing the pressure plate 120, and the lower protrusion 135 is located in the area defined by the lower sealing ring protrusion 133; an upper sealing ring protrusion 1211 corresponding to the lower sealing ring protrusion 133 and an upper protrusion 1212 corresponding to the lower protrusion 135 are provided on one side of the pressure plate 120 facing the bottom plate 130; the upper protrusion 1212 and the lower protrusion 135 are arranged close to the welding line; the bipolar plate 200 is pressed between the upper protrusion 1212 and the lower protrusion 135, and the bipolar plate 200 is located in the area defined by the lower sealing ring protrusion 133. When in use, after the bottom plate 130 and the pressure plate 120 cooperate to compress the bipolar plate 200, the lower sealing ring protrusion 133 and the upper sealing ring protrusion 1211 cooperate to form a closed accommodating cavity between the bottom plate 130 and the pressure plate 120, and the bipolar plate 200 is in the accommodating cavity, and the upper blowing port and the lower blowing port 134 are both connected to the accommodating cavity.

[0040] In this embodiment, there are two lower protrusions 135, which are concentrically nested, and the welding line is located between the two lower protrusions 135. Similarly, the upper protrusion 1212 corresponds to the lower protrusion 135, that is, there are two upper protrusions 1212, and the welding line is located between the two upper protrusions 1212. At this time, the lower blowing port 134 is used to guide the nitrogen in the blowing channel 131 to the area between the two lower protrusions 135, and the upper blowing port is used to guide the nitrogen in the blowing channel 131 to the area between the two upper protrusions 1212.

[0041] The lower protrusion 135 and the upper protrusion 1212 cooperate to compress the areas on both sides of the welding line of the bipolar plate 200 to prevent misalignment between the cathode plate and the anode plate of the bipolar plate 200 during welding, thereby ensuring welding quality.

[0042] In some embodiments, the pressure plate 120 may be an integrated design (not shown in the figure) and made of a material that can penetrate laser light, such as transparent quartz glass, transparent sapphire glass, etc.

[0043] When the pressing plate 120 adopts an integrated structural design, the blowing channel 131 is connected to the accommodating cavity formed between the bottom plate 130 and the pressing plate 120, the lower blowing port 134 is arranged at the lower protrusion 135, and the upper blowing port is arranged at the upper protrusion 1212. Specifically, after the nitrogen enters the accommodating cavity through the blowing channel 131, the upper blowing port is used to cool down the welding line area on the upper side of the bipolar plate 200 and dilute the oxygen concentration, and the lower blowing port 134 is used to cool down the welding line area on the lower side of the bipolar plate 200 and dilute the oxygen concentration, thereby preventing the bipolar plate 200 from being over-oxidized during the welding process.

[0044] The area between the two lower protrusions 135 is defined as the lower avoidance groove 132, and the area between the two upper protrusions 1212 is defined as the upper avoidance groove. It should be noted that when the pressing plate 120 adopts an integrated structural design, it is necessary to open a lower exhaust port connected to the lower avoidance groove 132 on the bottom plate 130, and open an upper exhaust port connected to the upper avoidance groove on the pressing plate 120, so that the nitrogen flowing to the upper and lower sides of the welding line area of ​​the bipolar plate 200 can flow smoothly and discharge the fixture to take away the heat generated during the welding process and empty the impurities generated during the welding process, and at the same time prevent the impurities from accumulating in the upper avoidance groove to affect the light transmittance of the pressing plate 120. In addition, the structural design of the upper avoidance groove and the lower avoidance groove 132 can guide the airflow, which is convenient for the designer to plan the nitrogen path according to the direction of the welding line, which is conducive to improving the utilization rate of nitrogen, and at the same time, it is conducive to the rapid spread of nitrogen along the direction of the welding line, which is conducive to improving the cooling efficiency of the welding line area of ​​the bipolar plate 200. In this embodiment, the laser is emitted into the upper avoidance groove through the pressing plate 120 to achieve the welding of the bipolar plate 200 .

[0045] In this embodiment, the pressing plate 120 adopts a split design. Figures 1 to 4 As shown, the pressing plate 120 includes an outer frame plate 121, an inner main plate 123 and an inner sub-plate 122. Fig.11 On the bipolar plate 200, the area outside the main welding line 201 is the edge sealing area 220, and the area inside the main welding line 201 includes the reaction area 210 and the hole area 230, wherein the hole area 230 is defined by the main welding line 201 and the first auxiliary welding line 202. In this embodiment, the outer frame plate 121 corresponds to the edge sealing area 220, the inner main plate 123 corresponds to the reaction area 210, and the inner auxiliary plate 122 corresponds to the hole area 230.

[0046] like Figure 1 and Figure 4As shown, when in use, the inner main board 123 is sleeved in the outer frame board 121, and at least part of the main welding line 201 corresponds to the first gap a formed between the outer frame board 121 and the inner main board 123; there are multiple upper air blowing ports, at least part of which are arranged on the outer frame board 121, and the upper air blowing ports are arranged toward the first gap a. The upper air blowing port on the outer frame board 121 is defined as the first upper air blowing port 1213, and the first gap a here corresponds to the upper avoidance groove in the aforementioned embodiment. Fig. 9 and Fig.10 As shown, one of the upper protrusions 1212 constituting the first gap a or the upper avoidance groove is arranged on the side surface of the outer frame plate 121 facing the bottom plate 130, and the other upper protrusion 1212 is arranged on the side surface of the inner main plate 123 facing the bottom plate 130, and the first blowing port is arranged on the upper protrusion 1212 on the outer frame.

[0047] like Figure 1 and Figure 4 As shown, when in use, the inner sub-plate 122 is sleeved in the outer frame plate 121 and is located between the inner main plate 123 and the outer frame plate 121, at least part of the first sub-welding line 202 corresponds to the second gap b formed between the inner sub-plate 122 and the inner main plate 123, and at least part of the main welding line 201 corresponds to the third gap c formed between the inner sub-plate 122 and the outer frame plate 121; at least part of the upper air blowing port is arranged on the inner sub-plate 122, and part of the upper air blowing port is arranged toward the second gap b and / or part of the upper air blowing port is arranged toward the third gap c. As mentioned above, the second gap b and the third gap c here also correspond to the aforementioned upper avoidance groove, the difference is that the upper protrusion 1212 constituting the upper avoidance groove generates a branch in the hole area 230, specifically the second gap b area. That is, at the end of the bipolar plate 200 in the length direction, the upper protrusion 1212 constituting the upper avoidance groove is respectively arranged on the outer frame plate 121, the inner sub-plate 122 and the inner main plate 123. Specifically as Figures 9 to 11 As shown, the upper air outlet on the inner main board 123 is defined as the second upper air outlet 1231, and the second upper air outlet 1231 is arranged at the upper protrusion 1212 on the inner main board 123; the upper air outlet on the inner sub-board 122 is defined as the third upper air outlet 1221, and the third upper air outlet 1221 is arranged at the upper protrusion 1212 on the inner sub-board 122.

[0048] Furthermore, if Figure 3 and Fig. 9As shown, further, an annular sealing groove 1331 is provided on the bottom plate 130 and / or the pressing plate 120, and the bipolar plate 200 is located in the area defined by the annular sealing groove 1331. Preferably, the annular sealing groove 1331 is provided on the lower sealing ring protrusion 133, and is extended along the extending direction of the lower sealing ring protrusion 133 on one side of the bottom plate 130 toward the pressing plate 120. During operation, a sealing strip 1332 is installed in the annular sealing groove 1331, and after the bottom plate 130 and the pressing plate 120 are brought close to each other, the sealing strip 1332 abuts against the upper sealing ring protrusion 1211, so as to seal the area defined by the annular sealing groove 1331.

[0049] In this embodiment, Figures 2 to 6 As shown, preferably, the blowing channel 131 is arranged on the bottom plate 130, and part of the blowing channel 131 extends to the bottom of the lower avoidance groove 132, as shown in FIG. Figure 6 As shown, the lower blowing port 134 is opened at the bottom of the lower avoidance groove 132, which is used to connect the lower avoidance groove 132 and the blowing channel 131. In this way, nitrogen can quickly enter the lower avoidance groove 132 through the blowing channel 131, so as to achieve cooling and oxygen dilution of the lower side of the welding line area of ​​the bipolar plate 200. Part of the blowing channel 131 extends to the area between the lower avoidance groove 132 and the lower sealing ring convex 133, at which time nitrogen can enter the pressing plate 120, Figure 6 Specifically, the air blowing channel 131 is provided in the gap between the outer frame plate 121 and the bipolar plate 200, and the third upper air blowing port 1221 provided on the outer frame plate 121 acts on the upper side of the bipolar plate 200 to achieve cooling and oxygen dilution of the lower side of the welding line area of ​​the bipolar plate 200. These two types of air blowing channels 131 can be opened separately or combined as follows: Figure 6 Use in the form shown.

[0050] In this embodiment, Figure 7 and Figure 8 As shown, part of the blowing channel 131 extends to the bottom of the inner sub-plate 122, and at this time, the lower blowing port 134 is opened on the side surface of the bottom plate 130 facing the inner sub-plate 122, which is used to connect the gap between the inner sub-plate 122 and the bottom plate 130. The gap between the inner sub-plate 122 and the bottom plate 130 is a part of the aforementioned accommodating cavity. When in use, nitrogen passes through the blowing channel 131, passes through the material port 203 of the bipolar plate 200, enters the upper side of the bipolar plate 200, and flows to the welding line area through the third upper blowing port 1221 set on the inner sub-plate 122, so as to achieve cooling and oxygen dilution of the upper side of the welding line area of ​​the bipolar plate 200.

[0051] Similarly, part of the blowing channel 131 extends to the bottom of the inner main board 123, reaches the upper side of the bipolar plate 200 through the hole structure (not shown) on the bipolar plate 200 corresponding to the inner main board 123, and flows to the welding line area through the second upper blowing port 1231 set on the inner main board 123, so as to achieve cooling and oxygen dilution of the upper side of the welding line area of ​​the bipolar plate 200. In actual application, the fixture can be adaptively adjusted according to the specific bipolar plate 200, so as to achieve cooling and oxygen dilution on both sides of the upper and lower sides of the welding line area of ​​the bipolar plate 200.

[0052] In this embodiment, the bipolar plate 200 welding fixture further includes a gas source, which is connected to the blowing channel 131. The gas source provides nitrogen.

[0053] In this embodiment, the bipolar plate 200 welding fixture further includes an air guide block 140, and the air guide block 140 has an air guide groove 142; the air blowing channel 131 has a plurality of air inlets, and the plurality of air inlets are connected to the air guide groove 142. Figure 2 and Figure 3 As shown, the air guide block 140 is installed on the edge of the bottom plate 130 , and the multiple air blowing channels 131 arranged on the bottom plate 130 can be connected through the air guide groove 142 on the air guide block 140 , so as to facilitate the simultaneous air supply to the multiple air blowing channels 131 .

[0054] Optionally, the air guide block 140 is fixed to the base plate 130 by screws or bolts.

[0055] In this embodiment, a gas nozzle 141 is provided on the gas guide block 140 , and the gas nozzle 141 is connected to the gas guide groove 142 for connecting to a gas source.

[0056] In this embodiment, Figure 1 and Figure 2 As shown, the bipolar plate 200 welding fixture also includes an electromagnetic suction cup 110, wherein: the bottom plate 130 is arranged on the working surface of the electromagnetic suction cup 110; the pressing plate 120 is arranged on the side of the bottom plate 130 away from the electromagnetic suction cup 110, and the pressing plate 120 can have a tendency to move toward the bottom plate 130 under the action of the electromagnetic suction cup 110. In this embodiment, the pressing plate 120 is made of magnetic material, and it can have a tendency to move toward the bottom plate 130 under the magnetic attraction of the electromagnetic suction cup 110, so as to provide a pressing force applied by the pressing plate 120 to the bipolar plate 200. Compared with the traditional fixing method, the electromagnetic suction cup 110 in this embodiment cooperates with the fixing method of the pressing plate 120 to have a higher disassembly and assembly efficiency, and the pressing force applied by the pressing plate 120 to the bipolar plate 200 can be adjusted by adjusting the electromagnetic force of the electromagnetic suction cup 110, so that the welding machine fixture can be adapted to the welding requirements of bipolar plates 200 of different models.

[0057] Furthermore, in order to improve the reliability of fixing the pressing plate 120 and the bottom plate 130, a plurality of magnetic columns 136 are embedded in the bottom plate 130; the area on the pressing plate 120 corresponding to the magnetic columns 136 is magnetic. The magnetic columns 136 can reduce the influence of the thickness of the bottom plate 130, which is conducive to ensuring the magnetic attraction of the electromagnetic chuck 110 to the pressing plate 120, that is, the outer frame plate 121, the inner main plate 123 and the inner sub-plate 122.

[0058] It should be noted that when the pressing plate is an integrated structure, magnetic materials such as magnets or iron can be built into the pressing plate. The pressing plate and the bottom plate 130 can also be fixed by means of screws or the like.

[0059] like Fig.12 As shown, in order to improve the structural strength of the bipolar plate 200, a welding spot 204 is preset in the reaction area 210 of the bipolar plate 200 to prevent excessive oxidation at the welding spot 204, that is, yellowing or bluing. Figure 3 , Figure 4 and Fig.10 As shown, the press plate 120, specifically the inner main plate 123, is provided with a welding hole 1232 corresponding to the welding point 204, an upper support protrusion 1233 is provided on one side of the inner main plate 123 facing the bottom plate 130, and a plurality of upper support protrusions 1233 are arranged around the welding hole 1232, and a plurality of lower support protrusions 137 corresponding to the plurality of upper support protrusions 1233 are provided on one side of the bottom plate 130 facing the inner main plate 123, and there is an air guide gap between two adjacent upper support protrusions 1233 and two adjacent lower support protrusions 137. When in use, the nitrogen entering the area between the inner main plate 123 and the bottom plate 130 (including the area between the inner main plate 123 and the bipolar plate 200 and the area between the bottom plate 130 and the bipolar plate 200) through the blowing channel 131 can flow through the air guide gap, thereby realizing the cooling and oxygen dilution of the upper and lower sides of the bipolar plate 200 in the welding point 204 area. The upper support protrusion 1233 and the lower support protrusion 137 here can reduce the processing workload of the matching surface of the fixture and the bipolar plate 200, which is conducive to ensuring the clamping accuracy of the fixture, and at the same time, it can reserve gaps on both sides of the bipolar plate 200 to facilitate the smooth flow of nitrogen entering the fixture through the blowing channel 131, specifically entering the area of ​​the inner main board 123. It should be noted that the air guide gap here serves as the aforementioned blowing port.

[0060] It should be noted that the bipolar plate 200 structure here is exemplary, and its appearance (mainly the structure and position of the material port 203) and welding wire planning can be adjusted accordingly according to actual needs. Accordingly, the bipolar plate 200 welding fixture provided in this embodiment can be adjusted accordingly following the adjustment of the bipolar plate 200.

[0061] In this embodiment, a positioning pin 138 is provided on the bottom plate 130 , and a positioning hole 124 adapted to the positioning pin 138 is provided on the pressing plate 120 .

[0062] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A bipolar plate welding fixture, characterized in that: include: Bottom plate (130); The pressing plate (120) and the bipolar plate (200) are pressed between the bottom plate (130) and the pressing plate (120), wherein: The bottom plate (130) and / or the pressing plate (120) are provided with a blowing channel (131); the bottom plate (130) is provided with a lower blowing port (134) connected to the blowing channel (131); the pressing plate (120) is provided with an upper blowing port connected to the blowing channel (131); the lower blowing port (134) and the upper blowing port are both arranged toward the welding line of the adjacent bipolar plate (200).

2. The bipolar plate welding fixture according to claim 1, characterized in that: A lower avoidance groove (132) corresponding to the welding line is provided on one side surface of the bottom plate (130) facing the pressing plate (120), and the lower air blowing port (134) is connected to the lower avoidance groove (132).

3. The bipolar plate welding fixture according to claim 1, characterized in that: The welding wire comprises a main welding wire (201); The pressing plate (120) comprises an outer frame plate (121) and an inner main plate (123), wherein the inner main plate (123) is sleeved inside the outer frame plate (121), and at least part of the main welding wire (201) corresponds to a first gap (a) formed between the outer frame plate (121) and the inner main plate (123); There are a plurality of upper air blowing ports, at least some of which are arranged on the outer frame plate (121), and the upper air blowing ports are arranged toward the first gap (a).

4. The bipolar plate welding fixture according to claim 3, characterized in that: The welding line further comprises a first auxiliary welding line (202), wherein the first auxiliary welding line (202) intersects with the main welding line (201); The pressing plate (120) further comprises an inner sub-plate (122), wherein the inner sub-plate (122) is sleeved inside the outer frame plate (121) and is located between the inner main plate (123) and the outer frame plate (121), at least part of the first sub-welding line (202) corresponds to a second gap (b) formed between the inner sub-plate (122) and the inner main plate (123), and at least part of the main welding line (201) corresponds to a third gap (c) formed between the inner sub-plate (122) and the outer frame plate (121); At least part of the upper air blowing ports are arranged on the inner sub-plate (122), and part of the upper air blowing ports are arranged toward the second gap (b); and / or Part of the upper air outlet is arranged toward the third gap (c).

5. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: The bipolar plate (200) welding fixture further comprises an electromagnetic chuck (110), wherein: The bottom plate (130) is arranged on the working surface of the electromagnetic chuck (110); The pressing plate (120) is arranged on a side of the bottom plate (130) away from the electromagnetic suction cup (110), and the pressing plate (120) can have a tendency to move toward the bottom plate (130) under the action of the electromagnetic suction cup (110).

6. The bipolar plate welding fixture according to claim 5, characterized in that: A plurality of magnetic columns (136) are embedded in the bottom plate (130); The area on the pressing plate (120) corresponding to the magnetic column (136) is magnetic.

7. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: The pressing plate (120) is an integrated structure, and the pressing plate (120) is made of a light-transmitting material.

8. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: The bipolar plate (200) welding fixture further comprises a gas guide block (140), wherein the gas guide block (140) has a gas guide groove (142); The air blowing channel (131) has a plurality of air inlets, and the plurality of air inlets are connected to the air guide groove (142).

9. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: An annular sealing groove (1331) is provided on the bottom plate (130) and / or the pressure plate (120), and the bipolar plate (200) is located within an area defined by the annular sealing groove (1331).

10. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: An upper protrusion (1212) is provided on one side of the pressing plate (120) facing the bottom, and a lower protrusion (135) corresponding to the upper protrusion (1212) is provided on one side of the bottom plate (130) facing the pressing plate (120); The upper protrusion (1212) and the lower protrusion (135) are arranged close to the welding line; and the bipolar plate (200) is pressed between the upper protrusion (1212) and the lower protrusion (135).

11. The bipolar plate welding fixture according to any one of claims 1 to 4, characterized in that: A welding point (204) is preset on the bipolar plate (200), and a welding hole (1232) is provided through the pressing plate (120), and the welding hole (1232) corresponds to the welding point (204); An upper supporting protrusion (1233) is arranged on one side of the pressing plate (120) facing the bottom plate (130), and a plurality of the upper supporting protrusions (1233) are arranged around the welding hole (1232); a plurality of lower supporting protrusions (137) corresponding to the plurality of upper supporting protrusions (1233) are arranged on one side of the bottom plate (130) facing the pressing plate (120), and an air guide gap is provided between two adjacent upper supporting protrusions (1233) and two adjacent lower supporting protrusions (137); The air guiding gap is connected to the air blowing channel (131).

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