Processing tooling for metal bipolar plates

Abstract

The application relates to the technical field of fuel cells, in particular to a processing tool for a metal bipolar plate. The processing tool comprises two tool plates used for clamping and fixing two polar plates, the tool plate comprises a frame body and at least one shielding strip, and the frame body is defined with a mounting window; the two ends of the shielding strip are connected with the two sides of the mounting window in correspondence, and the shielding strip is arranged in correspondence with a column of welding points of the polar plate. The processing tool and the processing method shield the welding point positions on the polar plate by the shielding strip, then the cathode plate and the anode plate which have completed surface treatment are welded, the contact resistance of the cathode plate and the anode plate can be effectively reduced, the performance of the fuel cell is improved, the shielding strip can avoid covering the welding point positions during surface treatment, and the shielding strip is favorable for avoiding the influence of the coating on the welding quality.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and in particular to tooling for processing metal bipolar plates. Background Technology

[0002] Bipolar plates, also known in the industry as current collectors, are an indispensable core component of fuel cells. They play a crucial role in the fuel cell system, serving multiple functions. Besides separating fuel and oxidant, they also collect and transfer current, evenly distribute gas, dissipate heat, and maintain a uniform temperature field within the cell. During fuel cell operation, bipolar plates play a vital role, and their performance directly affects the overall performance and lifespan of the fuel cell.

[0003] Current development trends in bipolar plates include graphite bipolar plates, metal bipolar plates, and composite bipolar plates. Metal bipolar plates possess advantages such as excellent electrical and thermal conductivity, light weight, and ease of processing and forming, which can significantly reduce manufacturing costs and have become a research hotspot. However, metal bipolar plates are susceptible to corrosion, leading to a decrease in stack efficiency and performance. Furthermore, during application, the passivation / oxide film formed on their surface can reduce conductivity, causing bipolar plate failure. Metal bipolar plates need to maintain excellent conductivity while also possessing good corrosion resistance. Therefore, surface coating modification of metal bipolar plates is employed to reduce contact resistance and improve their conductivity and corrosion resistance.

[0004] However, during laser welding of bipolar plates, the surface coating affects the welding quality. Utility Model Content

[0005] Therefore, it is necessary to provide a processing fixture for metal bipolar plates to address the issue of surface coatings affecting welding quality.

[0006] A machining fixture for a metal bipolar plate includes two fixture plates for clamping and fixing the two plates. The fixture plates include:

[0007] A frame, on which an installation window is defined;

[0008] At least one shielding strip, the two ends of which are connected to the two sides of the mounting window, and the shielding strip is provided in correspondence with a row of solder points of the electrode plate.

[0009] This processing fixture uses shielding strips to cover the weld points on the electrode plates before welding the surface-treated cathode and anode plates. This effectively reduces the contact resistance of the cathode and anode plates, improving the performance of the fuel cell. At the same time, the fixture avoids covering the weld points during surface treatment, ensuring the welding performance of the two cathode and anode plates and preventing the coating from affecting the welding quality. It also reduces the generation of pores in the bipolar plate water flow field area during laser welding, thereby preventing bipolar plate leakage or poor bonding strength between the cathode and anode plates.

[0010] In one embodiment, the shielding strip includes:

[0011] The main body is connected to both ends of the mounting window;

[0012] A shielding point is provided on the main body, and the shielding point is provided corresponding to the solder joint of the electrode plate.

[0013] The body of this shielding strip serves a connecting function, linking multiple shielding points in a row to simplify the structure of the tooling plate. The shielding points are used to shield each solder joint.

[0014] In one embodiment, the size of the blocking point is larger than the size of the body along the width direction of the body, thereby minimizing the width of the body while ensuring the blocking effect and structural strength, thus reducing the body's blocking of other non-welding locations.

[0015] In one embodiment, the shape of the shielding point is circular, elliptical, square, or polygonal, thereby meeting the shielding requirements of different solder joints.

[0016] In one embodiment, the two ends of the body are connected to the side of the frame away from the electrode plate, so that the electrode plate can be accommodated at least partially in the mounting window, and the outer periphery of the mounting window forms a limit on the electrode plate, which helps to improve the alignment effect of the two tooling plates assembling and clamping the electrode plate, thereby ensuring the accuracy of the shielding point shielding the solder joint.

[0017] In one embodiment, the thickness of the shielding strip is less than the thickness of the frame, and both ends of the shielding strip are connected to the side of the frame away from the electrode plate, so that the mounting window has a certain depth to accommodate the electrode plate, and the electrode plate is at least partially located in the mounting window, so as to limit the electrode plate by using the mounting window, which is beneficial to improve the alignment effect of assembling and clamping the electrode plate with two tooling plates, thereby ensuring the accuracy of the shielding point shielding the solder joint.

[0018] In one embodiment, the outer periphery of the mounting window is set correspondingly to the outer periphery of the electrode plate.

[0019] This tooling plate helps to prevent the frame from obstructing the outer periphery of the electrode, thus ensuring that the entire electrode can be surface-treated.

[0020] In one embodiment, the frame further defines a fixing hole, and the machining fixture further includes:

[0021] A fastener passes through the fixing hole to fix the relative positions of the two tooling plates.

[0022] The fasteners and the tooling plate work together to improve the stability of the tooling plate in holding and fixing the electrode plate, and prevent the electrode plate from shifting during the surface treatment process, thereby ensuring that the shielding point always corresponds to the welding point.

[0023] In one embodiment, there are multiple fixing holes, which are spaced apart circumferentially along the mounting window, and the fixing member is provided in a one-to-one correspondence with the fixing hole.

[0024] The fastener can constrain the electrode plate circumferentially, which helps to improve the fastening effect of the fastener.

[0025] In one embodiment, the fixing hole is positioned close to the mounting window, such that the outer periphery of the fixing hole is tangent to the mounting window. This allows the fixing member to not only fix the relative positions of the upper and lower tooling plates when inserted into the fixing hole, but also to constrain and limit the outer periphery of the electrode plate on the side of the fixing member closest to the mounting window, thus enabling the fixing member to perform both phase and fixation functions.

[0026] A method for processing a metal bipolar plate, which is accomplished using the processing fixture described above, includes the following steps:

[0027] Two electrode plates are placed back-to-back between two tooling plates, wherein the two electrode plates are arranged corresponding to the mounting window, the water flow field side of the electrode plate faces the corresponding shielding strip, and the shielding strip is arranged corresponding to a row of welding points of the electrode plate;

[0028] By fixing the relative positions of the two tooling plates, an assembly is obtained;

[0029] The assembly is placed in a surface treatment device for surface treatment to obtain the electrode plate with the water flow field side surface treatment completed;

[0030] The electrode plates with surface treatment completed on the water flow field side are arranged opposite each other, and then welded together to obtain a bipolar plate.

[0031] The processing method for this metal bipolar plate utilizes shielding strips to cover the weld points of the plate, preventing surface treatment from covering these areas. This helps ensure the welding performance when the two cathode and anode plates are welded together, avoids the coating affecting the weld quality, and reduces porosity in the bipolar plate's water flow area during laser welding, thereby preventing bipolar plate leakage or poor bonding strength between the anode and cathode plates. Simultaneously, this processing method uses two tooling plates to clamp the two back-to-back plates, improving surface treatment efficiency. Surface treatment effectively reduces the contact resistance of the anode and cathode plates, enhancing fuel cell performance.

[0032] In one embodiment, the tooling plate defines a fixing hole;

[0033] The step of placing the two electrode plates back-to-back between the two tooling plates includes:

[0034] Place one of the tooling plates;

[0035] Pass the pin through the fixing hole from bottom to top;

[0036] The water flow field side of one of the electrode plates faces the shielding strip of one of the tooling plates, and the shielding strip of one of the tooling plates is provided corresponding to a row of solder joints of the electrode plate;

[0037] Another fixture plate is placed on another electrode plate, the water flow field of the other electrode plate is lateral to the shielding strip of the other fixture plate, and the shielding strip of the other fixture plate is arranged corresponding to a row of solder joints of the electrode plate.

[0038] The pins are used to limit the perimeter of the electrode plates to ensure that the outer contours of the two electrode plates overlap when they are set up, and to ensure that the shielding strips correspond to the solder joints.

[0039] In one embodiment, fixing the relative positions of the two tooling plates to obtain the assembly includes:

[0040] Remove the pin, insert the bolt into the fixing hole, and use the nut to connect and fix the relative positions of the two tooling plates to the bolt to obtain the assembly.

[0041] After the electrode plate position is fixed, remove the pin, and then use bolts and nuts to connect the two tooling plates to ensure that the electrode plate position is fixed during surface treatment.

[0042] In one embodiment, it further includes:

[0043] Clean the bipolar plates;

[0044] The cleaned bipolar plate is then placed back into the surface treatment equipment for a second surface treatment.

[0045] The second surface treatment allows for surface treatment of the bipolar plate's outer surface, which optimizes surface properties, improves surface smoothness, enhances conductivity, reduces contact resistance, ensures smooth current flow within the battery, and improves battery efficiency. Simultaneously, the surface-treated coating protects the bipolar plate base from corrosion, extends its service life, increases mechanical strength, prevents performance degradation due to stress or deformation during use, and provides good thermal conductivity to aid heat dissipation, maintain stable battery temperature, and ensure continuous performance output. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the assembly structure of the machining tooling provided in one embodiment of this application.

[0047] Figure 2 This is a cross-sectional structural diagram of the machining tooling provided in one embodiment of this application.

[0048] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0049] Figure 4 This is a logical illustration of a processing method provided in one embodiment of this application. Figure 1 .

[0050] Explanation of reference numerals in the attached figures:

[0051] 100-Tooling plate; 110-Frame; 111-Mounting window; 112-Fixing hole; 120-Shielding strip; 121-Body; 122-Shielding point;

[0052] 200 - Plate; 210 - Water flow field side; 220 - Gas flow field side. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0059] See Figures 1-3 , Figure 1 A schematic diagram of the structure provided in one embodiment of this application is shown. Figure 2 A cross-sectional structural schematic diagram of the machining tooling provided in one embodiment of this application is shown. Figure 3 It shows Figure 2 A magnified view of a portion of point A in the middle.

[0060] like Figures 1-3 As shown, this embodiment provides a processing fixture for a metal bipolar plate. The fixture includes two fixture plates 100 for clamping and fixing two electrode plates 200, allowing both electrode plates 200 to undergo surface treatment simultaneously. Exemplarily, the electrode plate 200 can be an anode plate or a cathode plate. The electrode plate 200 has a water flow field side 210 and a gas flow field side. More specifically, the gas flow field side is divided into a hydrogen flow field side and an air flow field side. The anode plate has a water flow field side 210 and a hydrogen flow field side, and the cathode plate has a water flow field side 210 and an air flow field side.

[0061] The anode plate is the core area in a fuel cell where the oxidation reaction occurs. Its surface is equipped with a hydrogen flow field to evenly deliver fuel from the inlet to every active site in the anode catalyst layer, preventing reaction dead zones caused by insufficient fuel in certain areas. Simultaneously, it must maintain a stable fuel supply pressure to ensure the reaction rate matches the cathode, while preventing excessive pressure from damaging the proton exchange membrane. The anode plate substrate has excellent conductivity, enabling efficient transfer of electrons generated in the oxidation reaction to the external circuit, and simultaneously transferring electrons returning from the external circuit to the cathode plate. The cathode plate is the core area in a fuel cell where the oxidant reduction reaction occurs, and its structure is similar to that of the anode plate.

[0062] To prevent corrosion of the metal bipolar plates from affecting the efficiency and performance of the fuel cell stack, the surface of the metal bipolar plates is modified with a coating to reduce contact resistance and improve their conductivity and corrosion resistance.

[0063] The tooling plate 100 is used to clamp and fix the two electrode plates 200, thereby performing surface treatment on the electrode plates 200.

[0064] like Figure 1As shown, the tooling plate 100 includes a frame 110 and at least one shielding strip 120. The frame 110 defines an installation window 111; the two ends of the shielding strip 120 are connected to the sides of the installation window 111, and the shielding strip 120 is correspondingly positioned to correspond to a row of weld points on the electrode plate 200. This tooling plate 100 uses the shielding strip 120 to shield the weld point positions on the electrode plate 200 before welding the surface-treated cathode and anode plates. This effectively reduces the contact resistance of the cathode and anode plates, improving the performance of the fuel cell. Simultaneously, this tooling avoids covering the weld point positions during surface treatment, which helps ensure the welding performance when the two cathode and anode plates are welded and fixed, preventing the coating from affecting the welding quality. It also reduces the generation of pores in the bipolar plate water flow field area during laser welding, thereby preventing bipolar plate leakage or poor bonding strength between the cathode and anode plates.

[0065] The tooling plate 100 has a simple structure, which is conducive to large-scale application.

[0066] Specifically, during welding, the coating on the surface-treated electrode plate 200 affects the welding quality. Taking carbon coating as an example, when laser welding thin stainless steel, if a carbon coating is present on the surface, defects such as pores will form at the welding location. If pores form, the carbon coating oxidizes or directly vaporizes under the high temperature of the laser, generating CO gas, thus producing pores. If the gas escape rate is lower than the solidification rate of the molten pool, spherical pores will form, and the porosity can increase by up to 40%, severely affecting the welding quality.

[0067] Furthermore, each column has multiple shielding strips 120, which can simultaneously shield multiple solder joints in that column. The electrode plate 200 may also have multiple columns of solder joints, and there may be multiple shielding strips 120, with each shielding strip 120 shielding one column of solder joints.

[0068] like Figures 1-3 As shown, in one embodiment, the shielding strip 120 includes a body 121 and shielding points 122. The two ends of the body 121 are connected to both sides of the mounting window 111; the shielding points 122 are disposed on the body 121, corresponding to the solder joints of the electrode plate 200. The body 121 of the shielding strip 120 has a connecting function, used to connect multiple shielding points 122 in a row, thereby simplifying the structure of the tooling plate 100. The shielding points 122 are used to shield each solder joint.

[0069] For example, the body 121 may extend along a first direction to block multiple solder joints in the first direction. The body 121 may also extend along a second direction to block multiple solder joints along the second direction.

[0070] Specifically, the extension direction of the body 121 is the same as the arrangement direction of a row of solder joints.

[0071] Optionally, the shape of the shielding point 122 can be circular, elliptical, square, or polygonal to meet the shielding requirements of different solder joints. Since solder joints are usually circular, it is preferable that the shielding point 122 is circular to improve the shielding effect of the solder joint. In addition, the circular shielding point 122 has an arc shape with no sharp corners, which avoids sharp corners from scratching the operator and improves the safety of the operator during the operation.

[0072] The diameter of the shielding point 122 is larger than the diameter of the solder joint, thereby improving the shielding effect.

[0073] Optionally, along the width direction of the body 121, the size of the blocking point 122 is larger than the size of the body 121, thereby minimizing the width of the body 121 while ensuring the blocking effect of the blocking point 122 and the structural strength, thus reducing the blocking of other non-welding points by the body 121. Specifically, the width direction of the body 121 is perpendicular to the arrangement direction of a row of welding points.

[0074] Both ends of the body 121 are connected to the side of the frame 110 away from the electrode plate 200, so that the electrode plate 200 can be accommodated at least partially in the mounting window 111, and the outer periphery of the mounting window 111 forms a limit on the electrode plate 200, which helps to improve the alignment effect of the two tooling plates 100 assembling and clamping the electrode plate 200, thereby ensuring the accuracy of the shielding point 122 shielding the solder joint.

[0075] Optionally, the thickness of the shielding strip 120 is less than the thickness of the frame 110, and both ends of the shielding strip 120 are connected to the side of the frame 110 away from the electrode plate 200, so that the mounting window 111 has a certain depth to accommodate the electrode plate 200, and the electrode plate 200 is at least partially located in the mounting window 111, so as to limit the electrode plate 200 by using the mounting window 111, which is beneficial to improve the alignment effect of the two tooling plates 100 assembling and clamping the electrode plate 200, thereby ensuring the accuracy of the shielding point 122 shielding the solder joint.

[0076] In one embodiment, the outer periphery of the mounting window 111 is set to correspond to the outer periphery of the electrode plate 200, which helps to avoid the frame 110 from blocking the outer periphery of the electrode plate 200, so as to ensure that the entire electrode plate 200 can be surface treated.

[0077] The frame 110 also includes a fixing hole 112. The machining fixture also includes a fastener that passes through the fixing hole 112 to fix the relative positions of the two fixture plates 100. The fastener and the fixture plates 100 work together to improve the stability of the fixture plates 100 in clamping and fixing the electrode plate 200, and prevent the electrode plate 200 from shifting during the surface treatment process, thereby ensuring that the shielding point 122 always corresponds to the welding point position.

[0078] Furthermore, there are multiple fixing holes 112, which are spaced apart circumferentially along the mounting window 111, and the fixing members are set one-to-one with the fixing holes 112. At this time, the fixing members can constrain the electrode plate 200 circumferentially, which is beneficial to improving the fixing effect of the fixing members.

[0079] For example, the fastener can be a screw and nut assembly, a pin, etc.

[0080] Optionally, the fixing hole 112 is located near the mounting window 111, such that the outer periphery of the fixing hole 112 is tangent to the mounting window 111112. This way, when the fastener is inserted into the fixing hole 112, it not only fixes the relative position of the upper and lower tooling plates 100, but the side of the fastener near the mounting window 111 can also constrain and limit the outer periphery of the electrode plate 200, so that the fastener plays a dual role of limiting and fixing.

[0081] like Figure 4 As shown, this embodiment also provides a method for processing a metal bipolar plate, which is completed using the above-mentioned processing fixture. The processing method includes:

[0082] Two electrode plates 200 are placed back to back between two tooling plates 100, wherein the two electrode plates 200 are set to correspond to the installation window 111, and the water flow field side of the electrode plate 200 faces the corresponding shielding strip 120, and the shielding strip 120 is set to correspond to a row of welding points of the electrode plate 200.

[0083] By fixing the relative positions of the two tooling plates 100, the assembly is obtained;

[0084] The assembly is placed in a surface treatment device for surface treatment to obtain an electrode plate 200 with the surface treatment completed on the water flow field side 210.

[0085] The surface-treated electrode plates 200 on the water flow field side 210 are arranged opposite each other, and then welded together to obtain a bipolar plate.

[0086] The processing method of this metal bipolar plate utilizes a shielding strip 120 to shield the weld points of the electrode plate 200, preventing the surface treatment from covering the weld point locations. This helps ensure the welding performance when the two cathode and anode plates are welded and fixed, avoids the coating affecting the welding quality, and reduces the generation of pores in the water flow field area of ​​the bipolar plate during laser welding, thereby preventing bipolar plate leakage or poor bonding strength between the anode and cathode plates. Simultaneously, this processing method uses two tooling plates 100 to clamp the two back-to-back electrode plates 200, which improves surface treatment efficiency. Surface treatment can effectively reduce the contact resistance of the anode and cathode plates, improving the performance of the fuel cell.

[0087] At the same time, the metal bipolar plate is simple to process and suitable for large-scale applications.

[0088] Furthermore, before the electrode plate 200 is placed onto the fixture plate 100, the electrode plate 200 is a cleaned electrode plate that has not undergone surface treatment. Here, the electrode plate 200 can be a cathode plate or an anode plate. It is worth noting that the two electrode plates 200 held by the two fixture plates 100 are typically two cathode plates or two anode plates.

[0089] In the above process, the anode or cathode plate is typically made of stainless steel, titanium, copper, aluminum, nickel, etc. The surface treatment method is physical vapor deposition, used to coat the surface of the electrode plate 200.

[0090] The tooling plate 100 is defined with fixing holes 112, and the processing methods include:

[0091] Two electrode plates 200 are placed back-to-back between two tooling plates 100, including:

[0092] Place one of the tooling plates 100;

[0093] Pass the pin through the fixing hole 112 from bottom to top;

[0094] Two electrode plates 200 are placed back to back in the installation window 111, with the water flow field side 210 of one electrode plate 200 facing the shielding strip 120 of one of the tooling plates 100, and the shielding strip 120 of one of the tooling plates 100 is set to correspond to a row of welding points of the electrode plate 200.

[0095] Another fixture plate 100 is placed on another electrode plate 200, with the water flow field side 210 of the other electrode plate 200 facing the shielding strip 120 of the other fixture plate 100. The shielding strip 120 of the other fixture plate 100 is set to correspond to a row of welding points of the electrode plate 200.

[0096] In the above process, the pins are used to limit the periphery of the electrode plate 200 to ensure that the outer contours of the two electrode plates 200 overlap when they are set up, and to ensure that the shielding strip 120 corresponds to the solder joint.

[0097] By fixing the relative positions of the two tooling plates 100, an assembly is obtained, including:

[0098] Remove the pin, insert the bolt into the fixing hole 112, and use the nut and bolt to fix the relative positions of the two tooling plates 100 to obtain the assembly.

[0099] After the electrode plate 200 is fixed in position, remove the pin, and then use bolts and nuts to connect the two tooling plates 100 to ensure that the electrode plate 200 is fixed in position during surface treatment.

[0100] Furthermore, since the outer circumferential surface of the bolt has threads, and the thickness of the electrode plate 200 is typically very thin, generally around 0.075mm-0.3mm, if the position of the electrode plate 200 is constrained by bolts before placement, the threads can easily damage the outer circumferential contour of the electrode plate 200. Therefore, constraining the position of the electrode plate 200 with bolts before placement not only has a limiting function but also helps to ensure the structural stability of the electrode plate 200 and avoid damage to it.

[0101] Furthermore, the processing method also includes:

[0102] Clean the bipolar plates;

[0103] The cleaned bipolar plates are then placed back into the surface treatment equipment for a second surface treatment.

[0104] The second surface treatment allows for surface treatment of the bipolar plate's outer surface, which optimizes surface properties, improves surface smoothness, enhances conductivity, reduces contact resistance, ensures smooth current flow within the battery, and improves battery efficiency. Simultaneously, the surface-treated coating protects the bipolar plate base from corrosion, extends its service life, increases mechanical strength, prevents performance degradation due to stress or deformation during use, and provides good thermal conductivity to aid heat dissipation, maintain stable battery temperature, and ensure continuous performance output.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A machining fixture for a metal bipolar plate, characterized in that, The tooling includes two tooling plates for clamping and fixing two electrode plates. The tooling plates include: A frame, on which an installation window is defined; At least one shielding strip, the two ends of which are connected to the two sides of the mounting window, and the shielding strip is provided in correspondence with a row of solder points of the electrode plate.

2. The machining fixture for the metal bipolar plate according to claim 1, characterized in that, The shielding strip includes: The main body is connected to both ends of the mounting window; A shielding point is provided on the main body, and the shielding point is provided corresponding to the solder joint of the electrode plate.

3. The machining fixture for the metal bipolar plate according to claim 2, characterized in that, Along the width direction of the body, the size of the occlusion point is larger than the size of the body.

4. The machining fixture for the metal bipolar plate according to claim 2, characterized in that, The shape of the occlusion point can be circular, elliptical, square, or polygonal.

5. The machining fixture for the metal bipolar plate according to claim 2, characterized in that, Both ends of the main body are connected to the sides of the frame opposite to the electrode plate.

6. The machining fixture for the metal bipolar plate according to claim 2, characterized in that, The thickness of the shielding strip is less than the thickness of the frame, and both ends of the shielding strip are connected to the side of the frame away from the electrode plate.

7. The machining fixture for the metal bipolar plate according to any one of claims 1-6, characterized in that, The outer periphery of the installation window is set accordingly to match the outer periphery of the electrode plate.

8. The machining fixture for the metal bipolar plate according to any one of claims 1-6, characterized in that, The frame body further includes a fixing hole, and the machining fixture further includes: A fastener passes through the fixing hole to fix the relative positions of the two tooling plates.

9. The machining fixture for the metal bipolar plate according to claim 8, characterized in that, There are multiple fixing holes, which are spaced apart around the circumference of the mounting window, and the fixing member is provided in a one-to-one correspondence with the fixing hole.

10. The machining fixture for the metal bipolar plate according to claim 8, characterized in that, The fixing hole is positioned close to the mounting window, such that the outer periphery of the fixing hole is tangent to the edge of the mounting window.

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