Metal bipolar plate welding tool, welding device and welding method

Abstract

The invention provides a metal bipolar plate welding tool, device and method.The metal bipolar plate welding tool comprises a first tool plate, a second tool plate and a driving mechanism, the first tool plate is provided with a first pressing part and an annular second pressing part, and the second tool plate is provided with a second pressing part; the first tool plate is used for abutting against the middle area of the metal bipolar plate through the first pressing part and abutting against the annular peripheral area of the metal bipolar plate through the annular second pressing part. The annular second pressing part is formed by sequentially splicing more than two sub-pressing parts along the circumferential direction; the sub-pressing parts are used for pressing different positions on the annular peripheral area in a one-to-one correspondence manner; and the driving mechanism is used for driving each sub-pressing part to move so as to adjust the pressing force of each sub-pressing part on the corresponding position on the annular peripheral area. According to the technical scheme, the phenomenon of stress concentration on the annular peripheral area can be reduced, the problems of insufficient soldering, solder skips and welding deformation of the metal bipolar plate are solved, and the welding quality of the metal bipolar plate is effectively guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal bipolar plate welding, and particularly relates to a metal bipolar plate welding tooling, a welding device and a welding method. Background Art

[0002] As an efficient and environmentally friendly energy conversion device, a fuel cell has significant advantages such as high energy conversion efficiency and zero emissions, and has broad development prospects in the future energy field. A metal bipolar plate is the most important component in a fuel cell stack. The metal bipolar plate is mainly used for distributing reactants, conducting electricity, conducting heat, supporting a membrane electrode, and providing a flow channel for discharging water generated by the reaction. The mechanical strength of the metal bipolar plate and the flatness of the metal bipolar plate after laser welding have important effects on the working stability and power generation efficiency of the stack.

[0003] At present, laser welding is often used for welding metal bipolar plates. At the same time, in order to ensure the tightness and flatness of the metal bipolar plate welding, most of the current methods use tooling to perform a primary mechanical pressing treatment on the metal bipolar plate. However, usually due to the processing limitations of the tooling, when pressing the metal bipolar plate, the force on the area is uneven, and the metal bipolar plate cannot be effectively pressed together, resulting in serious deformation of the metal bipolar plate during welding, thereby affecting the subsequent sealing of the metal bipolar plate and the battery performance.

[0004] In the existing related technologies, a split-type laser welding tooling for a fuel cell metal bipolar plate is disclosed. The lower tooling plate of the welding tooling is sequentially spliced by a plurality of blocks arranged along the length direction. And each independent lower tooling plate segment is driven by an independent cylinder to apply different pressures to different regions of the metal bipolar plate. Among them, as Figure 1 shown, the metal bipolar plate 100 has a central region 101 and an annular outer peripheral region 102 arranged along the circumference of the central region 101. The annular outer peripheral region 102 has the outer edge contour of the metal bipolar plate 100. The metal bipolar plate 100 is generally welded along the outer edge contour. Therefore, it is crucial to press the outer edge contour of the metal bipolar plate, that is, the above-mentioned annular outer peripheral region, during welding. When welding and pressing, although the lower tooling plate of the above-mentioned welding tooling can adjust the force on the metal bipolar plate along the length direction, the force on the annular outer peripheral region 102 of the metal bipolar plate 100 is still prone to stress concentration, resulting in quality problems such as warping and virtual welding of the metal bipolar plate during welding, seriously affecting the sealing performance of the metal bipolar plate. Summary of the Invention

[0005] Therefore, the present invention provides a metal bipolar plate welding tooling, a welding device and a welding method, which can solve the technical problem that the force on the annular outer peripheral region of the metal bipolar plate is prone to stress concentration during welding and pressing, resulting in a decrease in welding quality in the prior art.

[0006] To solve the above problems, the present invention provides a welding tooling for metal bipolar plates, which includes a first tooling plate, a second tooling plate and a driving mechanism. The first tooling plate is used to press the metal bipolar plate against the second tooling plate to fix the metal bipolar plate.

[0007] Among them, the first tooling plate is provided with a first pressing portion and an annular second pressing portion. The annular second pressing portion is sleeved outside the first pressing portion. The first tooling plate is used to press the middle region of the metal bipolar plate through the first pressing portion, and press the annular outer peripheral region of the metal bipolar plate through the annular second pressing portion. The annular second pressing portion is formed by splicing two or more sub-pressing portions in sequence along the circumferential direction. Each sub-pressing portion is used to press different positions on the annular outer peripheral region one by one.

[0008] The driving mechanism is used to drive the movement of each sub-pressing portion to adjust the pressing force of each sub-pressing portion on the corresponding position on the annular outer peripheral region.

[0009] In some embodiments, the driving mechanism includes driving cylinders, and the number of the driving cylinders is equal to the number of the sub-pressing portions. The driving mechanism drives the corresponding sub-pressing portions to move through each driving cylinder one by one.

[0010] In some embodiments, in the projection along the center line direction of the first tooling plate, the annular second pressing portion is used to press the contour line of the metal bipolar plate in the middle.

[0011] In some embodiments, the first pressing portion has an annular outer side wall, and the annular second pressing portion is sleeved on the annular outer side wall. Each sub-pressing portion has a first side opposite to the annular outer side wall, and the first sides of each sub-pressing portion are opposite to different regions on the annular outer side wall. Among them, each sub-pressing portion is used to move under the guidance of the opposite regions on the annular outer side wall.

[0012] In some embodiments, the first tooling plate is provided with an installation groove, and both the first pressing portion and the annular second pressing portion are located in the installation groove. The installation groove has an annular groove wall, and the annular second pressing portion is sleeved inside the annular groove wall.

[0013] Each sub-pressing portion has a second side opposite to the annular groove wall, and the second sides of each sub-pressing portion are opposite to different regions on the annular groove wall. Among them, each sub-pressing portion is used to move under the guidance of the opposite regions on the annular groove wall.

[0014] In some embodiments, the number of the sub-pressing parts is N, the annular outer peripheral region has N first regions arranged in sequence along the circumferential direction, and each of the sub-pressing parts is used to press each of the first regions correspondingly;

[0015] Wherein, the welding device further includes a detection device, and the detection device is used to detect the pressing force received by each of the first regions.

[0016] In some embodiments, the detection device includes N pressure sensors, and the detection device detects the pressing force received by each of the first regions correspondingly through each of the pressure sensors.

[0017] In some embodiments, any one of the first regions is taken as the A region, the pressure sensor corresponding to the A region is the A pressure sensor, and the sub-pressing part corresponding to the A region is the A sub-pressing part; wherein,

[0018] In the projection along the center line direction of the first tooling plate, the edge of the first pressing part and the A sub-pressing part are opposite to different regions of the sensing part of the A pressure sensor.

[0019] In some embodiments, the metal bipolar plate welding tooling further includes a controller, and the controller is used to control the driving mechanism to drive the sub-pressing part corresponding to the first region to move when the pressing force received by the first region is less than a preset value, so that the pressing force received by the first region is equal to the preset value.

[0020] In some embodiments, the metal bipolar plate welding tooling further includes a data collector and a display, and the data collector is used to provide the pressing force received by each of the first regions to the display for display.

[0021] The present invention also provides a welding device, which includes the metal bipolar plate welding tooling according to any one of the above; wherein, the welding device further includes a welding structure, and the welding structure is used to perform welding treatment on the metal bipolar plate.

[0022] The present invention also provides a welding method for welding a metal bipolar plate using the welding device described above. The metal bipolar plate welding tooling includes a detection device and a controller. The detection device includes N pressure sensors, and the detection device detects the pressing force received by each of the first regions correspondingly through each of the pressure sensors. The controller is used to control the driving mechanism to drive the sub-pressing part corresponding to the first region to move when the pressing force received by the first region is less than a preset value, so that the pressing force received by the first region is equal to the preset value. The welding method includes the following steps:

[0023] Install the welding device on the welding platform;

[0024] Place the metal bipolar plate to be welded at a preset position on the second tooling plate;

[0025] The welding platform drives the first tooling plate to approach the second tooling plate, so that the first tooling plate presses the metal bipolar plate against the second tooling plate, and the first pressing part presses the middle area, and the annular second pressing part presses the annular outer peripheral area;

[0026] When the pressing force received by the first area is less than the preset value, control the driving mechanism to drive the sub-pressing part corresponding to this first area to move, so that the pressing force received by this first area is equal to the preset value;

[0027] Start the welding structure to weld the metal bipolar plate.

[0028] A metal bipolar plate welding tooling, welding device and welding method provided by the present invention have the following beneficial effects:

[0029] 1. Since a separate annular second pressing part is provided to press the annular outer peripheral area of the metal bipolar plate, and each sub-pressing part of the annular second pressing part can apply different pressing forces to different positions on the annular outer peripheral area, the pressing force of each sub-pressing part on the corresponding position on the annular outer peripheral area can be adjusted according to the actual situation during welding and pressing, so that the force on each part of the annular outer peripheral area is uniform, and thus the stress concentration phenomenon on the annular outer peripheral area can be reduced, solving the problems of virtual welding, leakage welding of the metal bipolar plate and welding deformation of the metal bipolar plate, and effectively ensuring the welding quality of the metal bipolar plate.

[0030] 2. The present invention detects the pressing force received by each first area through a detection device, and can control the driving mechanism according to the value detected by the detection device to control the movement of each sub-pressing part, so that the pressing force received by each first area is consistent. In this way, the pressing force can be evenly distributed at each welding part, and the contact surface of the welded part can be effectively bonded. Description of the Drawings

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are only exemplary. For those of ordinary skill in the art, other implementation drawings can be obtained by extending according to the provided drawings without creative efforts.

[0032] Figure 1 It is a structural schematic diagram of a metal bipolar plate provided by an embodiment of the present invention;

[0033] Figure 2 It is a position relationship diagram between a metal bipolar plate welding tooling and a metal bipolar plate provided by an embodiment of the present invention;

[0034] Figure 3 It is a partial structural schematic diagram when a metal bipolar plate welding tooling presses a metal bipolar plate provided by an embodiment of the present invention;

[0035] Figure 4 It is a diagram reflecting the positional relationship between the first pressing part and the annular second pressing part when pressing the metal bipolar plate and the pressure sensor;

[0036] Figure 5 It is a schematic diagram reflecting when the first pressing part presses the metal bipolar plate;

[0037] Figure 6 It is a schematic diagram reflecting when the annular second pressing part presses the metal bipolar plate;

[0038] Figure 7 It is a positional relationship diagram between a metal bipolar plate welding tooling and a metal bipolar plate provided by another embodiment of the present invention.

[0039] Reference numerals are:

[0040] 1, the first pressing part; 1a, the edge of the first pressing part; 2, the annular second pressing part; 3, the pressure sensor; 3a, the A pressure sensor; 4, the driving cylinder; 5, the data collector; 6, the display; 7, the data line; 10, the first tooling plate; 11, the annular outer wall; 10a, the installation groove; 20, the second tooling plate; 21, the sub-pressing part; 21a, the A sub-pressing part; 30, the fixed point; 100, the metal bipolar plate; 101, the middle region; 102, the annular outer peripheral region; 211, the first side; 212, the second side; 1021, the first region; 1021a, the A region; 10a1, the annular groove wall. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0043] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0044] In addition, it should be noted that the use of words such as "first", "second" etc. to limit the components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0045] Combined with reference to Figures 1-7 As shown, according to an embodiment of the present invention, a metal bipolar plate welding tooling is provided, which includes a first tooling plate 10, a second tooling plate 20 and a driving mechanism. The first tooling plate 10 is used to press the metal bipolar plate 100 against the second tooling plate 20 to fix the metal bipolar plate 100. Among them, a first pressing portion 1 and an annular second pressing portion 2 are provided on the first tooling plate 10. The annular second pressing portion 2 is sleeved outside the first pressing portion 1.

[0046] The metal bipolar plate 100 has a central region 101 and an annular outer peripheral region 102 disposed circumferentially along the central region 101, and the annular outer peripheral region 102 has the outer edge contour of the metal bipolar plate 100. The above-mentioned first tooling plate 10 is used to press the central region 101 of the metal bipolar plate 100 through the first pressing portion 1, and the first tooling plate 10 presses the annular outer peripheral region 102 of the metal bipolar plate 100 through the annular second pressing portion 2. Among them, the annular second pressing portion 2 is formed by splicing two or more sub-pressing portions 21 in sequence along the circumference. Each sub-pressing portion 21 is used to press different positions on the annular outer peripheral region 102 one by one. The driving mechanism is used to drive the movement of each sub-pressing portion 21 to adjust the pressing force of each sub-pressing portion 21 on the corresponding position of the annular outer peripheral region 102.

[0047] In the above example, since the annular second pressing portion 2 is separately provided to press the annular outer peripheral region 102 of the metal bipolar plate 100, and each sub-pressing portion 21 of the annular second pressing portion 2 can apply different pressing forces to different positions on the annular outer peripheral region 102, the pressing force of each sub-pressing portion 21 on the corresponding position of the annular outer peripheral region 102 can be adjusted according to the actual situation during welding and pressing, so that the forces on each part of the annular outer peripheral region 102 are uniform, and further the stress concentration phenomenon on the annular outer peripheral region 102 can be reduced, solving the problems of virtual soldering, leakage soldering of the metal bipolar plate 100 and welding deformation of the metal bipolar plate 100, and effectively ensuring the welding quality of the metal bipolar plate 100.

[0048] The above-mentioned first pressing portion 1 and each sub-pressing portion 21 can both be plate-shaped to facilitate pressing the metal bipolar plate 100.

[0049] It should be noted here that: the above-mentioned metal bipolar plate 100 can be a metal bipolar plate of a fuel cell.

[0050] In one example, the aforementioned first pressing portion 1 can be integrally formed on the first tooling plate 10 to improve the connection stability between the first pressing portion 1 and the first tooling plate 10. In another example, the first pressing portion 1 is detachably arranged on the first tooling plate 10 to facilitate the disassembly, assembly and maintenance of the first pressing portion 1.

[0051] In order to realize the function of the aforementioned driving mechanism, in some embodiments, as Figure 3 shown, the aforementioned driving mechanism can include a driving cylinder 4, and the number of driving cylinders 4 is equal to the number of the aforementioned sub-pressing portions 21. The driving mechanism drives the corresponding sub-pressing portions 21 to move one by one through each driving cylinder 4 to adjust the pressing force of each sub-pressing portion 21 on the corresponding position of the annular outer peripheral region 102.

[0052] Among them, the above-mentioned driving cylinder 4 can be an air cylinder or a hydraulic cylinder, etc.

[0053] In some embodiments, Figure 4 As shown, in the projection along the center line direction of the first tooling plate 10 , the annular second pressing portion 2 is used to press the contour line of the metal bipolar plate 100 in the middle.

[0054] In the above example, the annular peripheral area 102 has the outer edge contour of the metal bipolar plate 100. The annular second pressing portion 2 can ensure that the annular second pressing portion 2 can provide pressing force to all parts of the annular peripheral area 102 by pressing the contour line of the metal bipolar plate 100 in the middle, thereby preventing the annular peripheral area 102 from being partially not pressed by the second pressing portion, resulting in uneven force.

[0055] In some embodiments, Figure 4 As shown, in the projection along the center line direction of the first tooling plate 10 , the center line of the annular second pressing portion 2 extending in the circumferential direction coincides with the contour line of the metal bipolar plate 100 , which is conducive to making the force on the annular second pressing portion 2 more uniform.

[0056] In some embodiments, Figure 3 As shown, the aforementioned first pressing portion 1 has an annular outer wall 11, and the annular second pressing portion 2 is sleeved on the annular outer wall 11. Each sub-pressing portion 21 has a first side 211 opposite to the annular outer wall 11, and the first side 211 of each sub-pressing portion 21 is opposite to a different area on the annular outer wall 11. Among them, each sub-pressing portion 21 is used to move under the guidance of the relative area on the annular outer wall 11.

[0057] In the above example, the annular outer side wall 11 of the first pressing portion 1 can guide the movement of each sub-pressing portion 21 by cooperating with the first side 211 of each sub-pressing portion 21 to improve the movement accuracy of each sub-pressing portion 21 .

[0058] In some embodiments, Figure 3 As shown, each of the aforementioned sub-pressing portions 21 is slidably matched with the annular outer side wall 11 of the first pressing portion 1 to facilitate the annular outer side wall 11 of the first pressing portion 1 to guide the movement of each sub-pressing portion 21 .

[0059] In some embodiments, Figure 3 As shown, the aforementioned first tooling plate 10 is provided with a mounting groove 10a. The first pressing portion 1 and the annular second pressing portion 2 are both located in the mounting groove 10a. The mounting groove 10a has an annular groove wall 10a1, and the annular second pressing portion 2 is sleeved in the annular groove wall 10a1. Each sub-pressing portion 21 has a second side 212 opposite to the annular groove wall 10a1. The second side 212 of each sub-pressing portion 21 is opposite to a different area on the annular groove wall 10a1. Among them, each sub-pressing portion 21 is used to move under the guidance of the relative area on the annular groove wall 10a1.

[0060] In the above example, the annular groove wall 10a1 of the installation groove 10a can guide the movement of each sub-pressing part 21 by cooperating with the second side 212 of each sub-pressing part 21, so as to improve the movement accuracy of each sub-pressing part 21.

[0061] In some embodiments, as Figure 4 shown, the number of the foregoing sub-pressing parts 21 is N, and the foregoing annular outer peripheral region 102 has N first regions 1021 arranged in sequence along the circumferential direction. Each sub-pressing part 21 is used to press each first region 1021 one by one. Wherein, the welding device further includes a detection device, and the detection device is used to detect the pressing force received by each first region 1021.

[0062] In the above example, by setting the detection device to detect the pressing force received by each first region 1021, the driving mechanism can be controlled according to the value detected by the detection device, so as to control the movement of each sub-pressing part 21, so that the pressing force received by each first region 1021 is consistent. In this way, it can be ensured that the pressing forces of each welding part are evenly distributed, and the contact surfaces of the welded parts are effectively fitted.

[0063] In order to realize the function of the foregoing detection device, in some embodiments, as Figure 4 shown, the foregoing detection device may include N pressure sensors 3, and the detection device detects the pressing force received by each first region 1021 through each pressure sensor 3 one by one, so that the function of the detection device detecting the pressing force received by each first region 1021 can be realized.

[0064] As Figure 2 shown, multiple rows of sensor fixing points 30 may be provided at the edge part and the middle part of the foregoing second tooling plate 20, the number of the pressure sensors 3 is equal to the number of the fixing points 30 on the second tooling plate 20, and they correspond one by one. Each pressure sensor 3 is respectively fixed on the surface of the corresponding fixing point 30. Wherein, an installation groove body for installing the corresponding pressure sensor 3 may be provided at each fixing point 30.

[0065] In some embodiments, as Figure 2 shown, the distances between the pressure sensor fixing points 30 on the same side of the second tooling plate 20 are equal and evenly distributed. Wherein, when an installation groove body for installing the pressure sensor 3 is provided at the fixing point 30, the installation groove bodies on the same side of the second tooling plate 20 are parallel to each other.

[0066] In some embodiments, the foregoing pressure sensor 3 may be a thin-film pressure sensor. The foregoing data collector 5 is a multi-channel data collector, and can display and observe the pressure distribution in real time.

[0067] In some embodiments, asFigure 4 As shown, any one of the foregoing first regions 1021 is taken as the A region 1021a, the pressure sensor 3 corresponding to the A region 1021a is the A pressure sensor 3a, and the sub-pressing portion 21 corresponding to the A region 1021a is the A sub-pressing portion 21a. Among them, in the projection along the center line direction of the first tooling plate 10, the edge 1a of the first pressing portion and the A sub-pressing portion 21a face different regions of the sensing portion of the A pressure sensor 3a, so that the A pressure sensor 3a can simultaneously detect the compressive stress applied to the A region 1021a by both the first pressing portion 1 and the A sub-pressing portion 21a, enabling the A pressure sensor 3a to accurately reflect the force condition of the A region 1021a.

[0068] In some embodiments, the metal bipolar plate welding tooling further includes a controller, and the controller is configured to control the driving mechanism to drive the sub-pressing portion 21 corresponding to the first region 1021 to move when the pressing force received by the first region 1021 is less than a preset value, so that the pressing force received by the first region 1021 is equal to the preset value.

[0069] In the above example, the controller and the driving mechanism cooperate to automatically adjust the pressing force received by each first region 1021. In this way, manpower can be saved, which is beneficial to realizing automatic control operation. Among them, when the driving mechanism includes driving cylinders 4, the number of driving cylinders 4 is equal to the number of sub-pressing portions 21, and when the driving mechanism drives the corresponding sub-pressing portions 21 to move one by one through the driving cylinders 4, the controller is configured to, when the pressing force received by the first region 1021 is less than the preset value, control the driving cylinder 4 to drive the sub-pressing portion 21 corresponding to the first region 1021 to move, so that the pressing force received by the first region 1021 is equal to the preset value.

[0070] Each of the foregoing first regions 1021 has a welding site. In a specific application example, the foregoing preset value can be 2N. When the pressing force received by a certain first region 1021 is less than the preset value, such as 2N, the controller can automatically identify the pressure difference and control the corresponding driving cylinder 4 to drive the sub-pressing portion 21 corresponding to the first region 1021 to move, so that the pressing force received by the first region 1021 is equal to the preset value, that is, 2N. Among them, the technology that the controller controls the driving cylinder 4 to drive the pressing component, such as the sub-pressing portion 21, to press a certain region, such as the first region 1021, so that the first region 1021 receives the preset pressing force is the prior art, and the specific principle will not be elaborated here.

[0071] In the above example, the cooperation of the controller, each pressure sensor 3 and each driving cylinder 4 can automatically and secondarily micro-adjust in real time to make the pressing forces of all parts of the metal bipolar plate 100 evenly distributed, ensuring effective fitting of the contact surfaces of the welded parts.

[0072] Among them, the above-mentioned metal bipolar plate welding tooling has a manual mode and an automatic mode, and they can be switched according to needs.

[0073] In some embodiments, as Figure 7 shown, the aforementioned metal bipolar plate welding tooling further includes a data collector 5 and a display 6. The data collector 5 is used to provide the pressing forces received by the foregoing first regions 1021 to the display 6 for display, so that the pressing forces received by the first regions 1021 can be displayed and observed in real time. In this example, the data collector 5 and the foregoing pressure sensors 3 can be connected one by one through a data line 7 to collect the data collected by the pressure sensors 3, and calculate and store the pressing forces received by the first regions 1021. The foregoing controller can be integrated on the data collector 5. The data collector 5 calculates the pressing forces received by the first regions 1021 through the controller to quantitatively identify the pressing forces received by the first regions 1021 respectively.

[0074] The above-mentioned data collector 5 is a multi-channel data collector, which can meet the function of storing multiple groups of data at the same time. The data collector 5 has multiple data collection points, and each data collection point is connected to each pressure sensor 3 one by one to collect the data of each pressure sensor 3.

[0075] Among them, the metal bipolar plate welding tooling of the present invention can accurately identify and monitor the stress concentration parts during the welding and pressing of the metal bipolar plate 100 through the detection device, quickly reflect the distribution of the welding pressing force, and make precise guidance for the subsequent adjustment of the pressing force. It effectively solves the problem that the distribution of the pressing force cannot be monitored and identified by a one-time rigid pressing, and greatly improves the welding quality. Among them, the welding flatness is the key to affecting the welding quality. When the metal bipolar plate 100 is welded and pressed, the stresses on each part of the metal bipolar plate 100 cannot be uniform, which is likely to cause stress concentration, resulting in quality problems such as warping and false soldering of the metal bipolar plate 100 during welding, seriously affecting the sealing performance of the metal bipolar plate 100. The present invention accurately identifies the magnitudes of the pressing forces on each part through the detection device, quickly and intuitively reflects the distribution of the pressing force, facilitates the subsequent adjustment of the uniform distribution of the pressing force, and effectively ensures the welding flatness of the metal bipolar plate 100.

[0076] The metal bipolar plate welding tool of the present invention can automatically and in real time fine-tune the welding pressing force distribution according to the result of the metal bipolar plate 100 pressing force distribution identification, until the pressing force distribution of each part is uniform, so as to ensure the effective fit of the contact surface of the welding part. Among them, the uneven distribution of the pressing force of the metal bipolar plate 100 seriously affects the flatness of the bipolar plate, and the stress of the metal bipolar plate 100 is concentrated during welding pressing, thereby affecting the welding quality and sealing of the metal bipolar plate 100. At present, most welding tools cannot monitor and adjust the pressing force distribution of the metal bipolar plate 100 through a hard pressing once, and cannot ensure the uniform distribution of the pressing force of each part. The metal bipolar plate welding tool of the present invention uses a soft contact pressing method, and does not perform a hard pressing once during welding. After accurately identifying the size of the pressing force of each part and reflecting the pressing force distribution, the device automatically and in real time fine-tune the pressing force of each part of the metal bipolar plate 100 to be uniformly distributed, effectively ensuring the welding quality of the metal bipolar plate 100.

[0077] Among them, the metal bipolar plate welding tooling of the present invention has pressure sensing identification and real-time automatic adjustment functions. It can accurately analyze and identify the local stress concentration points of the metal bipolar plate 100 during the welding and clamping process, and perform secondary micro-adjustments of the local clamping force in a targeted manner, thereby effectively solving the problems of cold welding, leaking welding and bipolar plate welding deformation of the metal bipolar plate 100, and effectively ensuring the welding quality of the bipolar plate.

[0078] The metal bipolar plate welding tool of the present invention has the following advantages compared with the prior art:

[0079] In the present invention, on the one hand, each pressure sensor 3 is respectively fixed on the surface of the welding pressure sensing site, each driving cylinder 4 corresponds to the corresponding sub-pressing part 21 one by one, each pressure sensor 3 can measure the clamping force at each welding site, and each driving cylinder 4 can adjust the clamping force at each welding site by controlling the movement of the sub-pressing part 21; on the other hand, the pressure sensor 3 is connected to the data collector 5, so that the measured pressure value is stored in the data collector 5, and the controller can automatically identify the difference between the system preset clamping force value and the measured value and adjust the clamping force value to be the same as the system preset value by controlling the driving cylinder 4, and perform secondary fine-tuning until the clamping force of each part of the metal bipolar plate 100 is evenly distributed, thereby ensuring that the contact surface of the welding part is effectively fitted, and effectively improving the welding quality of the metal bipolar plate 100.

[0080] The present invention also provides a welding device, which may include the metal bipolar plate welding tooling of any one of the above. The welding device further includes a welding structure for performing welding treatment on the metal bipolar plate 100. Among them, due to the adoption of the above metal bipolar plate welding tooling by the welding device, the stress concentration phenomenon on the annular outer peripheral region 102 can be reduced, and the problems of virtual welding, missed welding of the metal bipolar plate 100 and welding deformation of the metal bipolar plate 100 are solved, effectively ensuring the welding quality of the metal bipolar plate 100.

[0081] The above welding structure may be a laser welding structure. During welding, the metal bipolar plate 100 is installed and fixed and pressed tightly in the above metal bipolar plate welding tooling. After the metal bipolar plate 100 is pressed and fitted, the welding part is exposed and the laser welding structure is turned on to complete the welding.

[0082] The present invention also provides a welding method for welding the metal bipolar plate 100 using the above welding device. Among them, the metal bipolar plate welding tooling includes a detection device and a controller. The detection device includes N pressure sensors 3, and the detection device detects the pressing force received by each first region 1021 through each pressure sensor 3 one by one. The controller is used to control the driving mechanism to drive the sub-pressing part 21 corresponding to the first region 1021 to move when the pressing force received by the first region 1021 is less than a preset value, so that the pressing force received by the first region 1021 is equal to the preset value. Based on this, the above welding method includes the following steps:

[0083] Step S1: Install the welding device on the welding platform to complete the installation of the welding device.

[0084] Step S2: Place the metal bipolar plate 100 to be welded at a preset position on the second tooling plate 20 to complete the installation of the metal bipolar plate 100 to be welded.

[0085] Step S3: The welding platform drives the first tooling plate 10 to approach the second tooling plate 20, so that the first tooling plate 10 presses the metal bipolar plate 100 against the second tooling plate 20, and the first pressing part 1 on the first tooling plate 10 presses the middle region 101 of the metal bipolar plate 100, and the annular second pressing part 2 on the first tooling plate 10 presses the annular outer peripheral region 102 of the metal bipolar plate 100.

[0086] Among them, the specific structure of the welding platform is the prior art, and the welding platform can drive the first tooling plate 10 to approach or away from the second tooling plate 20. It should be noted here that: the above welding platform is sometimes also called a welding device.

[0087] Step S4: when the pressing force applied to the first area 1021 is less than a preset value, the driving mechanism is controlled to drive the sub-pressing portion 21 corresponding to the first area 1021 to move, so that the pressing force applied to the first area 1021 is equal to the preset value.

[0088] The above steps S3 and S4 can both be performed in the automatic mode.

[0089] Step S5: starting the welding structure to weld the metal bipolar plate 100 .

[0090] In the above example, the pressing surface of the aforementioned first pressing portion 1 and the pressing surface of each sub-pressing portion 21 are located on the same plane at the initial position. After the first tooling plate 10 and the second tooling plate 20 are both installed on the welding platform, the welding platform drives the first tooling plate 10 to approach the second tooling plate 20, and the first pressing portion 1 on the first tooling plate 10 presses the middle area 101 of the metal bipolar plate 100, and the annular second pressing portion 2 on the first tooling plate 10 presses the annular outer peripheral area 102 of the metal bipolar plate 100, at this time, the metal bipolar plate 100 is pre-pressed; then each pressure sensor 3 real-timely presses each first The pressing force applied to the area 1021 is detected. When the pressing force applied to a first area 1021 is less than a preset value, the driving mechanism is controlled to drive the sub-pressing portion 21 corresponding to the first area 1021 to move, so that the pressing force applied to the first area 1021 is equal to the preset value. Finally, the pressing force applied to each first area 1021 is kept consistent by adjusting the sub-pressing portion 21. This makes the force applied to the metal bipolar plate 100 more uniform, reduces stress concentration, and effectively solves the problems of cold welding, leaking welding, and bipolar plate welding deformation of the metal bipolar plate 100, thereby effectively ensuring the welding quality of the bipolar plate.

[0091] Among them, during the welding process, the local stress concentration points of the metal bipolar plate 100 during the welding and clamping process are identified through precise analysis, and the local clamping force is adjusted secondary in a targeted manner to ensure that the contact surface of the welding part is effectively fitted, thereby effectively ensuring the welding quality of the metal bipolar plate 100 and reducing production costs.

[0092] The working principle of the present invention is as follows:

[0093] During welding and pressing, first input the preset value of the pressing force into the system, and then start the device. At this time, the pressure sensor 3 detects the pressing force at each welding part. The system automatically identifies the difference between the actual value and the preset value of the pressing force at each part through the controller. When there is a discrepancy between the actual value and the preset value of the pressing force at a certain local welding position, the signal is collected by the data collector 5 and the controller automatically identifies the signal of the local pressure value. After being processed by the controller, the signal is fed back to the corresponding drive cylinder 4, and the drive cylinder 4 drives the corresponding sub-pressing part 21 to move, so as to adjust the local pressure value, make the pressure values of several non-compliant local points consistent with the system preset value, and make the pressing force evenly distributed.

[0094] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0095] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A metal bipolar plate welding tool, characterized in that: It comprises a first tooling plate (10), a second tooling plate (20) and a driving mechanism, wherein the first tooling plate (10) is used to press a metal bipolar plate (100) against the second tooling plate (20) to fix the metal bipolar plate (100); The first tooling plate (10) is provided with a first pressing portion (1) and an annular second pressing portion (2), and the annular second pressing portion (2) is sleeved on the outside of the first pressing portion (1); the first tooling plate (10) is used to press the middle area (101) of the metal bipolar plate through the first pressing portion (1), and to press the annular outer peripheral area (102) of the metal bipolar plate through the annular second pressing portion (2); the annular second pressing portion (2) is formed by splicing two or more sub-pressing portions (21) in sequence along the circumferential direction; each sub-pressing portion (21) is used to press different positions on the annular outer peripheral area (102) in a one-to-one correspondence; The driving mechanism is used to drive each of the sub-pressing portions (21) to move, so as to adjust the pressing force of each of the sub-pressing portions (21) on a corresponding position on the annular outer peripheral area (102).

2. The metal bipolar plate welding tool according to claim 1, characterized in that: The driving mechanism comprises driving cylinders (4), the number of the driving cylinders (4) being equal to the number of the sub-pressing parts (21), and the driving mechanism drives the corresponding sub-pressing parts (21) to move in a one-to-one correspondence through each of the driving cylinders (4).

3. The metal bipolar plate welding tool according to claim 1 or 2, characterized in that: In the projection along the center line direction of the first tooling plate (10), the annular second pressing portion (2) is used to press the contour line of the metal bipolar plate (100) in the middle.

4. The metal bipolar plate welding tool according to claim 1 or 2, characterized in that: The first pressing portion (1) has an annular outer wall (11), and the annular second pressing portion (2) is sleeved on the annular outer wall (11); each of the sub-pressing portions (21) has a first side (211) opposite to the annular outer wall (11), and the first side (211) of each of the sub-pressing portions (21) is opposite to a different area on the annular outer wall (11); wherein each of the sub-pressing portions (21) is used to move under the guidance of a relative area on the annular outer wall (11).

5. The metal bipolar plate welding tool according to claim 1 or 2, characterized in that: The first tooling plate (10) is provided with a mounting groove (10a), the first pressing portion (1) and the annular second pressing portion (2) are both located in the mounting groove (10a), the mounting groove (10a) has an annular groove wall (10a1), and the annular second pressing portion (2) is sleeved in the annular groove wall (10a1); Each of the sub-pressing portions (21) has a second side (212) opposite to the annular groove wall (10a1), and the second side (212) of each of the sub-pressing portions is opposite to a different area on the annular groove wall (10a1); wherein each of the sub-pressing portions (21) is used to move under the guidance of a relative area on the annular groove wall (10a1).

6. The metal bipolar plate welding tool according to claim 1 or 2, characterized in that: The number of the sub-pressing portions (21) is N, the annular outer peripheral area (102) has N first areas (1021) arranged in sequence along the circumferential direction, and each of the sub-pressing portions (21) is used to press each of the first areas (1021) in a one-to-one correspondence; Wherein, the welding device further comprises a detection device, and the detection device is used to detect the pressing force applied to each of the first regions (1021).

7. The metal bipolar plate welding tool according to claim 6, characterized in that: The detection device comprises N pressure sensors (3), and the detection device detects the pressing force applied to each of the first areas (1021) in a one-to-one correspondence through each of the pressure sensors (3).

8. The metal bipolar plate welding tool according to claim 7, characterized in that: Any first region (1021) is taken as region A (1021a), the pressure sensor (3) corresponding to the region A (1021a) is taken as pressure sensor A (3a), and the sub-pressing portion (21) corresponding to the region A (1021a) is taken as sub-pressing portion A (21a); ​​wherein, In the projection along the center line direction of the first tooling plate (10), the edge (1a) of the first pressing portion and the A sub-pressing portion (21a) are opposite to different areas of the sensing portion of the A pressure sensor (3a).

9. The metal bipolar plate welding tool according to claim 7 or 8, characterized in that: It also includes a controller, which is used to control the driving mechanism to drive the sub-pressing portion (21) corresponding to the first area (1021) to move when the pressing force applied to the first area (1021) is less than a preset value, so that the pressing force applied to the first area (1021) is equal to the preset value.

10. The metal bipolar plate welding tool according to claim 7 or 8, characterized in that: The metal bipolar plate welding tool further comprises a data collector (5) and a display (6), wherein the data collector (5) is used to provide the display (6) with the pressing force applied to each of the first regions (1021) for display.

11. A welding device, characterized in that: A metal bipolar plate welding tool comprising any one of claims 1 to 10; wherein the welding device further comprises a welding structure, and the welding structure is used to perform welding processing on the metal bipolar plate (100).

12. A welding method for welding metal bipolar plates using the welding device of claim 11, wherein: The metal bipolar plate welding tool of the welding device is the metal bipolar plate welding tool of claim 9, characterized in that the welding method comprises the following steps: Installing the welding device on a welding platform; Placing the metal bipolar plate (100) to be welded at a preset position on the second tooling plate (20); The welding platform drives the first tooling plate (10) to approach the second tooling plate (20), so that the first tooling plate (10) presses the metal bipolar plate (100) against the second tooling plate (20), and the first pressing portion (1) presses the middle area (101), and the annular second pressing portion (2) presses the annular outer peripheral area (102); When the pressing force applied to the first area (1021) is less than a preset value, controlling the driving mechanism to drive the sub-pressing portion (21) corresponding to the first area (1021) to move, so that the pressing force applied to the first area (1021) is equal to the preset value; The welding structure is started to weld the metal bipolar plate (100).

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