CN109877452B - Welding method for metal bipolar plate of fuel cell - Google Patents
Welding method for metal bipolar plate of fuel cell Download PDFInfo
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- CN109877452B CN109877452B CN201910189388.7A CN201910189388A CN109877452B CN 109877452 B CN109877452 B CN 109877452B CN 201910189388 A CN201910189388 A CN 201910189388A CN 109877452 B CN109877452 B CN 109877452B
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Abstract
The invention provides a welding method of a metal bipolar plate of a fuel cell, which comprises the steps of positioning an anode plate and a cathode plate in the metal bipolar plate, enabling the anode plate and the cathode plate to be tightly attached, then using laser beams to move relative to the metal plate along the welding track of the metal bipolar plate, completing a welding path of a plurality of steps, and enabling the anode plate and the cathode plate to be in fusion joint; wherein the laser beam is a low power high frequency pulsed laser beam; and the laser beam also has a weld initiation buffer path before the weld path is performed and a weld termination buffer path after the weld path is completed. The welding method of the invention fully ensures the air tightness of the bipolar plate, has the welding qualification rate of 100 percent, completely overcomes the defect of sealing and air leakage of the metal bipolar plate in other modes, and accelerates the industrialized and automatic production of the metal bipolar plate galvanic pile.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a welding method of a metal bipolar plate of a fuel cell.
Background
A fuel cell is a power generation device that directly converts chemical energy in a fuel and an oxidant into electrical energy. Because the electrochemical reaction is adopted, no combustion is generated, and the restriction of the Carnot cycle is avoided, the energy conversion efficiency is far higher than that of a common heat engine. In addition, the fuel cell has the advantages of no pollution, low noise, high reliability and the like, and has very wide market prospect in the fields of transportation, distributed power generation, portable power generation and the like.
Bipolar plates are important components in fuel cell stacks for distributing reactants, conducting electricity, conducting heat, and supporting Membrane Electrodes (MEAs), as well as providing flow channels for removing water produced by the reaction. The tightness of the bipolar plate determines whether the fuel cell can operate properly. The sealability of bipolar plates is a challenge, especially for the sealing of ultra-thin metallic bipolar plates. If the qualification rate of each bipolar plate cannot be guaranteed to be 100% in the sealing process of the bipolar plate, each bipolar plate needs to be subjected to a leakage detection test, huge manpower, material resources and financial resources are consumed, and meanwhile, the leakage detection test also has the risk of deformation and even damage of the bipolar plate, so the qualification rate of the bipolar plate directly influences the cost and the capacity of the fuel cell. Common bipolar plate sealing methods include bonding and laser welding; the adhesive is mainly suitable for graphite bipolar plates, but the rejection rate is still high, and the adhesive for adhesion is easy to age at the operating temperature of the fuel cell, so that the coolant is leaked. The metal bipolar plate is welded by conventional high-power laser, so that the bipolar plate is easy to break down, the welding wire is poor in continuity, air leakage is caused, the bipolar plate shape is enlarged, the contact area of the bipolar plate and a membrane electrode is reduced, the contact resistance is increased, the performance of a fuel cell is influenced, and the metal bipolar plate cannot be used at all if the metal bipolar plate is heavy.
In conclusion, for the fuel cell, the sealing of the bipolar plate and the qualification rate thereof are of great importance, and the time cost and the economic cost of investment as well as the performance and the service life of the fuel cell are directly influenced; the welding difficulty of the metal pole plate with the thickness within 0.15mm is higher.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a high-efficiency and reliable welding method of a metal bipolar plate of a fuel cell.
In order to achieve the above object, the present invention provides a welding method for a metal bipolar plate for a fuel cell, the welding method comprising the steps of:
positioning two unipolar plates in the metal bipolar plate, and enabling the two unipolar plates to be tightly attached;
the laser beam and the metal polar plate move relatively along the welding track of the metal polar plate to complete a welding path of a plurality of steps, so that the two unipolar plates are fused and jointed;
wherein the laser beam is a low power high frequency pulsed laser beam;
the laser beam also has a weld initiation buffer path prior to implementing the weld path and a weld termination buffer path after completing the weld path.
Further, the laser beam has a first start point, a second start point, a first power peak point, a second power peak point, a first power attenuation point, a second power attenuation point, a first end point, and a second end point, respectively;
the step of completing a number of said welding paths by relative movement of said laser beam comprises:
the laser beam starts to irradiate the unipolar plate from a first starting point and moves relative to the unipolar plate, and the laser beam reaches the set output power when moving to a first power peak point;
the laser beam moves at a constant speed along a set welding path according to the output power;
the output power is reduced when the laser beam moves to a first power attenuation point;
moving the laser beam to a first end point, and ending irradiation;
the laser beam starts to irradiate the unipolar plate from the second starting point and moves relative to the unipolar plate, and the laser beam reaches the set output power when moving to the second power peak point;
the laser beam moves at a constant speed along a set welding path according to the output power;
the output power is reduced when the laser beam moves to a second power attenuation point;
the laser beam moves to a second end point, and the irradiation is ended.
Further, the number of the laser beams is two.
Further preferably, the laser beam is moved in a spiral line, the diameter of each spot formed by the laser beam moving in the spiral line is 0.05-0.30mm, and the adjacent spots have overlapping portions overlapping each other, and the area of the overlapping portions is smaller than that of any one spot.
Further, the area of the overlapping portion is 10% -70% of the area of any one welding spot.
Further or preferably, the output power of the laser beam is 10-100W, and the pulse frequency is 500-3000 Hz.
Further, the thickness of the anode plate and the cathode plate is 0.05-0.30 mm.
Further, the distance between the welding start buffer path and the welding end buffer path is less than or equal to 1 cm.
Further or preferably, characterized in that the relative movement rate of the laser beam is 2-15 mm/s.
The invention provides a welding method of a fuel cell metal bipolar plate, which comprises the steps of positioning an anode plate and a cathode plate in the metal bipolar plate, enabling the anode plate and the cathode plate to be tightly attached, then carrying out relative movement along the welding track of the metal bipolar plate by using a laser beam, completing a welding path of a plurality of steps, and enabling the anode plate and the cathode plate to be in fusion joint; wherein the laser beam is a low power high frequency pulsed laser beam; and the laser beam also has a weld initiation buffer path before the weld path is performed and a weld termination buffer path after the weld path is completed.
The welding method provided by the invention has the following beneficial effects:
(1) by using the low-power pulse laser, the deformation amount of the metal bipolar plate is reduced, the contact area of the bipolar plate and the membrane electrode is increased, and the performance of the galvanic pile is improved;
(2) the quality of a welding line and the air tightness of the bipolar plate can be ensured by adjusting the light emitting speed of the laser and the overlapping rate of welding spots;
(3) by using the clamp, the female and male unipolar plates can be tightly attached, and the unipolar plates are supported by the positioning bottom plate and cannot be subjected to stress deformation; by using the positioning pin of the clamp, the positioning precision of the unipolar plate is ensured, the occurrence of dislocation is avoided, and the welding quality and the air tightness of the bipolar plate are further ensured;
by the technical scheme of the invention, the air tightness of the bipolar plate is fully ensured, the qualification rate of the bipolar plate is 100 percent through test, the defect of sealing and air leakage of the metal bipolar plate in other modes is completely overcome, and the industrial and automatic production of the metal bipolar plate galvanic pile is accelerated.
Drawings
FIG. 1 is a schematic flow chart of steps a-f of a welding method for a metal bipolar plate of a fuel cell according to the present invention;
FIG. 2 is a schematic flow chart of steps g-n of a welding method for a metal bipolar plate of a fuel cell according to the present invention;
FIG. 3 is a schematic flow chart of steps a-f of a modified embodiment of a welding method for a metal bipolar plate of a fuel cell according to the present invention;
FIG. 4 is a schematic flow chart of a modified embodiment of a welding method for a metal bipolar plate of a fuel cell according to the present invention, wherein steps g-n are shown;
FIG. 5 is a schematic diagram of a welding spot in a welding method for a metal bipolar plate of a fuel cell according to the present invention;
FIG. 6 is a partial view of a bonding wire for showing better bonding effect;
FIG. 7 is a partial view of a weld line showing an excessive spot overlap;
FIG. 8 is a partial schematic view showing severe ablation of a bipolar plate due to excessive spot overlap;
FIG. 9 is a partial schematic view of a weld line showing a spot overlap ratio that is too small.
In the figure:
1. the first welding path 2, the second welding path 3, the third welding path 4, the fourth welding path 5, the fifth welding path 6, the sixth welding path 7, the seventh welding path 8, the eighth welding path 9, the ninth welding path 10, the tenth welding path 11, the eleventh welding path 12, the twelfth welding path 13, the thirteenth welding path 14, the fourteenth welding path 15, the first start point 16, the second start point 17, the first end point 18, the second end point 19, the first fluid medium area 20, the second fluid medium area 21, the reaction area 22, the first start buffer path 23, the second start buffer path 24, the first end buffer path 25, the second end buffer path 26, the first power peak point 27, the second power peak point 28, the first power attenuation point 29, the second power attenuation point 30, the welding spot 31 and the overlap.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Referring to fig. 1-4, the present invention provides a method for welding a metal bipolar plate of a fuel cell, comprising the following steps:
positioning two unipolar plates (an anode plate and a cathode plate) in the metal bipolar plate, and enabling the anode plate and the cathode plate to be tightly attached;
performing relative movement along the welding track of the metal bipolar plate by using a laser beam to complete a welding path of a plurality of steps so as to enable the anode plate and the cathode plate to be fused and jointed;
the positioning of the anode plate and the cathode plate refers to fixing the anode plate and the cathode plate according to the using state of the anode plate and the cathode plate in a bipolar plate, and the preset parts of the anode plate and the cathode plate are tightly attached in the state; the welding track refers to the sum of the welding paths of several steps.
In the embodiment, the laser beam is a low-power high-frequency pulse laser beam, and has the effects of reducing the deformation of the metal bipolar plate, increasing the contact area of the bipolar plate and the membrane electrode and improving the performance of the galvanic pile; the power adjustment of the laser is implemented as a percentage of the power of the laser; wherein, in some preferred embodiments, the output power of the laser beam is 10-100W, and the pulse frequency is 500-3000 Hz; in the experiment of the applicant, when the output power of the laser beam is 49W and the pulse frequency is 1000Hz, the welding effect is better, the bipolar plate has clear back marks after welding and has no welding ablation points, as shown in FIG. 6;
in the embodiment provided by the invention, the energy output of the laser beam adopts a mode of slowly increasing at the starting point and slowly decreasing at the end point; specifically, the welding track of the laser beam comprises a welding path for fusion-joining the anode plate and the cathode plate, a welding starting buffer path for gradually reaching the process requirement range of the output power of the laser beam, and a welding ending buffer path for reducing the output power of the laser beam to a safe range. The buffer path is arranged to ensure that the output power of the laser beam on the welding path is consistent, and avoid the over-welding or under-welding caused by the overlarge or the undersize of the power of the starting point or the end point of the laser. In some preferred embodiments, the distance between the weld initiation buffer path and the weld termination buffer path is less than or equal to 1 cm.
In the embodiment provided by the invention, the unipolar plates respectively have a first start point 15, a second start point 16, a first power peak point 26, a second power peak point 27, a first power attenuation point 28, a second power attenuation point 29, a first end point 17, and a second end point 18, the first start point 15, the first power peak point 26, the first power attenuation point 28, and the first end point 17 are located on the same side, and the second start point 16, the second power peak point 27, the second power attenuation point 29, and the second end point 18 are located on the same side;
the step of completing a number of said welding paths by relative movement of said laser beam comprises:
the laser beam starts to irradiate the unipolar plate from the first starting point 15 and moves relative to the unipolar plate, and the set output power is reached when the laser beam moves to the first power peak point 26;
the output power begins to decrease as the laser beam moves to the first power attenuation point 28;
the laser beam moves to the first end point 17, and the irradiation is ended;
the laser beam starts to irradiate the unipolar plate from the second starting point 16 and moves relative to the unipolar plate, and the laser beam reaches the set output power when moving to the second power peak point;
the output power begins to decrease as the laser beam moves to the second power attenuation point 29;
the laser beam moves to the second end point 18, ending the irradiation;
the present invention provides an example for illustrating a complete welding process on a bipolar plate.
In this embodiment, as shown in fig. 1 and 2, the anode plate and the cathode plate have a first fluid medium region 19, a second fluid medium region 20 and a reaction region 21 corresponding to each other in position, the first fluid medium region 19 and the second fluid medium region 20 are respectively located on both lateral (length direction) sides of the reaction region 21, both longitudinal sides (width direction of the reaction region 21) between the first fluid medium region 19 and the reaction region 21 respectively have a first starting point 15 and a second starting point 16, both longitudinal sides between the second fluid medium region 20 and the reaction region 21 respectively have a first end point 17 and a second end point 18, the first starting point 15 and the first end point 17 are located on the same side, and the second starting point 16 and the second end point 18 are located on the same side.
An exemplary welding embodiment is provided in the present invention, it being noted that the welding path is divided into several segments in this example for the purpose of facilitating the understanding of the trend of the welding path by the skilled person, while the movement of the laser beam along the welding path between the starting point and the end point should be understood as continuous, without undue limitation of the invention;
as shown in fig. 1, the step of performing a plurality of welding paths by the relative movement of the laser beam with the welded electrode plate includes:
the laser beam starts from a first starting point 15, sequentially passes through a first power peak point 26, a first welding path 1, a second welding path 2, a third welding path 3, a fourth welding path 4, a fifth welding path 5, a sixth welding path 6, a seventh welding path 7, an eighth welding path 8, a ninth welding path 9, a tenth welding path 10, an eleventh welding path 11, a twelfth welding path 12, a thirteenth welding path 13 and a first power attenuation point 28, and finally moves to a first end point 17 to finish irradiation;
the laser beam starts from the second starting point 16, sequentially passes through the first power peak point 27, the fourteenth welding path 14 and the second power attenuation point 29, and finally moves to the second end point 18 to finish irradiation;
the method specifically comprises the following steps:
a, starting to irradiate the unipolar plate from the first starting point 15, moving the unipolar plate relative to the unipolar plate, reaching a set output power when the laser beam moves to the first power peak point 26, and then moving the unipolar plate in the direction of the second starting point 16 to perform the operation of the first welding path 1; it should be understood that the second starting point 16 side refers to the other side with respect to the reference, with respect to one side in the width direction of the reaction zone 21 where the first starting point 15 is located;
b moving the laser beam away from the reaction zone 21 to perform the operation of the second welding path 2;
c moving the laser beam in the direction of the second starting point 16 to perform the operation of the third welding path 3;
d moving the laser beam in the direction of the reaction zone 21 to perform the operation of the fourth welding path 4;
e moving the laser beam in the direction of the second starting point 16 to perform the operation of the fifth welding path 5;
f moving the laser beam in the direction of the first starting point 15 to perform the operation of the sixth welding path 6; the two end parts of the sixth welding path 6 are arc sections of a quarter of circumference respectively, so that the moving direction of the laser beam is towards the first terminal point 17 after the sixth welding path 6 is finished; the welding path is divided into three sections, the first section of laser beam makes a quarter of circular arc movement to enable the movement direction of the laser beam to face to the first starting point 15 side, the second section of laser beam makes a linear movement along the direction, the third section of laser beam makes a quarter of circular arc movement, and the movement direction of the laser beam faces to the first end point 17 side when the welding path is finished; wherein the first end point 17 side refers to the other side of the reaction zone 21 with respect to the reference, with the one side in the length direction of the reaction zone in which the first start point 15 is located as the reference; as also shown, the sixth welding path 6 end point coincides with the first welding path 1 start point;
g the operation of the seventh welding path 7 is performed by moving the laser beam in the direction of the second fluid medium area 20;
h moving the laser beam in the direction of the second end point 18 side to perform the operation of the eighth welding path 8;
i the operation of carrying out the ninth welding path 9 by moving the laser beam in a direction away from the reaction zone 21;
j moving the laser beam in the direction of the second end point 18 side to perform the operation of the tenth welding path 10;
k moving the laser beam in the direction of the reaction zone 21 to carry out the operation of the eleventh welding path 11;
the twelfth welding route 12 is performed by moving the laser beam in the direction of the second end point 18;
moving the laser beam toward the first end point 17 to perform a thirteenth welding path 13, wherein the two ends of the thirteenth welding path 13 are arc segments of a quarter of a circle, and the thirteenth welding path 13 is moved toward the first start point 15; the output power begins to decrease as the laser beam moves to the first power attenuation point 28; then moving to a first end point 17 to end the irradiation; the thirteenth welding path 13 is in principle identical to the sixth welding path 6.
n (as shown in fig. 2) the laser beam starts to irradiate the unipolar plate from the second start point 16 and moves relative to the unipolar plate to reach the set output power when moving to the second power peak point 27; the laser beam is then moved in the direction of the second fluid medium region 20 to effect operation of the fourteenth weld path 14 and to the second power attenuation point 29, the laser beam output power is reduced and moved to the second end point 18 to terminate irradiation;
according to the welding method, the welding path is mainly straight, the arc paths are few, the curve complexity is low, the programming difficulty can be reduced when the automatic welding equipment is used, and the production efficiency is improved; in addition, the welding method has less welding path junction points and can prevent the bipolar plate from being burnt through.
In this embodiment, the weld initiation buffer path includes:
in step a, the laser beam reaches a first start buffer path 22 from the first start point 15 to the set output power;
in step n, the laser beam reaches the second initial buffer path 23 from the second start point 16 to the set output power;
the weld termination buffer path includes:
in step m, the laser beam decreases from the output power to the second end point 18 as the first end buffer path 24;
in step n, the laser beam decreases from the output power to the first end point 17 as the second end buffer path 25.
It should be understood by those skilled in the art that movement of the laser beam refers to relative movement between the laser beam and the unipolar plate, which may be a welding fixture and a fixed laser that are arranged to be movable, or a welding fixture and a movable laser that are arranged to be fixed.
In this embodiment, two welding starting points are arranged, which may be any starting point to complete the corresponding steps sequentially, and in some improved embodiments, two laser beam emitting devices may be provided simultaneously, and the corresponding steps may be performed sequentially or simultaneously.
In some improved embodiments, the second start buffer path 23 has a coincidence with the sixth welding path 6, the first end buffer path 24 has a coincidence with the seventh welding path 7, and the second end buffer path 25 has a coincidence with the thirteenth welding path 13; as shown in fig. 3 and 4, taking the second start buffer path as an example, the laser beam turns after moving from the second start point 16 to the sixth welding path 6, moves to the start point of the sixth welding path 6 in the opposite direction of the sixth welding path 6, the start point coincides with the second power peak point 27, the laser beam power reaches the peak value, then the operation of the fourteenth welding path 14 is performed, the laser beam output power starts to decrease after moving to the second power attenuation point 29, at this time, the laser beam continues to move a small section along the thirteenth welding path 13, then the laser beam turns to move away from the unipolar plate to the second end point 18, and the irradiation is finished; the principle of the first termination buffer path 24 is the same; the overlapping section of the buffering path and the welding path is used for avoiding the phenomenon that the welding quality is influenced by the over-welding or the false welding caused by the displacement error at the intersection of the starting section and the ending section of the platform or the laser beam device for loading the unipolar plate, for a person skilled in the art, the length of the overlapping section can be properly set according to actual needs, and the distance between the welding starting buffering path and the welding ending buffering path including the overlapping section is less than or equal to 1 cm.
In the embodiment provided by the present invention, the laser beam is moved in a spiral line, the diameter of each spot 30 formed by the laser beam moving in the spiral line is 0.05-0.30mm, as shown in fig. 5, the adjacent spots 30 have overlapping portions 31 overlapping each other, and the area of the overlapping portion 31 is smaller than that of any one spot 30; preferably, the area of the overlapping portion 31 is 10% to 70%, preferably 30%, of the area of any one of the welding spots 30, which can ensure the air tightness of the welded bipolar plate; fig. 6 is a partial schematic view of a bonding wire for showing a better bonding effect according to the present invention.
In the embodiment provided by the invention, the moving speed of the laser beam is 2-15mm/s, and the applicant finds in experiments that when the moving speed of the laser beam is 4mm/s, the diameter of the welding spot 30 is less than 0.2mm, the overlapping rate is 30%, and the fine consistency of welding lines is better. The moving speed of the laser beam is too fast, the overlapping rate between the welding spots 30 is reduced (figure 9), and the risk of air leakage exists; the rate of movement of the laser beam is too slow and the overlap between the spots 30 increases (fig. 7), with the risk of back side ablation and even breakdown of the bipolar plate (fig. 8).
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. A welding method for a metal bipolar plate for a fuel cell, comprising the steps of:
positioning two unipolar plates in the metal bipolar plate, and enabling the two unipolar plates to be tightly attached;
performing relative movement along the welding track of the unipolar plates by using laser beams to complete a welding path of a plurality of steps so as to melt and join the two unipolar plates;
wherein the laser beam is a low power high frequency pulsed laser beam;
the laser beam also has a weld initiation buffer path before the weld path is performed and a weld termination buffer path after the weld path is completed;
the laser beam is respectively provided with a first starting point, a second starting point, a first power peak point, a second power peak point, a first power attenuation point, a second power attenuation point, a first terminal point and a second terminal point;
the step of completing a number of said welding paths by relative movement of said laser beam comprises: the laser beam starts to irradiate the unipolar plate from a first starting point and moves relative to the unipolar plate, and the laser beam reaches the set output power when moving to a first power peak point;
the laser beam moves at a constant speed along a set welding path according to the output power;
the output power begins to decrease when the laser beam moves to a first power attenuation point;
when the laser beam moves to a first end point, ending the irradiation;
the laser beam starts to irradiate the unipolar plate from the second starting point and moves relative to the unipolar plate, and the laser beam reaches the set output power when moving to the second power peak point;
the laser beam moves at a constant speed along a set welding path according to the output power;
the output power begins to decrease when the laser beam moves to the second power attenuation point;
when the laser beam moves to a second end point, ending the irradiation;
the method specifically comprises the following steps: a, starting to irradiate the unipolar plate from a first starting point by a laser beam, moving relative to the unipolar plate, reaching a set output power when the laser beam moves to a first power peak point, and then moving towards a second starting point side to implement the operation of a first welding path; the second starting point side means the other side with respect to the reference, with one side in the width direction of the reaction zone where the first starting point is located as the reference;
b, moving the laser beam in a direction far away from the reaction zone to implement the operation of a second welding path;
c, moving the laser beam towards the direction of the second starting point side to implement the operation of a third welding path;
d, moving the laser beam towards the reaction zone to implement the operation of a fourth welding path;
e moving the laser beam toward the second starting point side to perform the operation of the fifth welding path;
f moving the laser beam in the direction of the first starting point side to perform the operation of the sixth welding path; the two end parts of the sixth welding path are arc sections of a quarter of circumference respectively, so that the sixth welding path finishes the process of enabling the moving direction of the laser beam to be towards the first terminal side; the welding path is divided into three sections, the first section of laser beam makes a quarter of circular arc movement to enable the movement direction of the laser beam to face the first starting point side, the second section of laser beam makes a linear movement along the direction, the third section of laser beam makes a quarter of circular arc movement, and the movement direction of the laser beam faces the first terminal point side when the laser beam is finished; the first end point side refers to the other side relative to one side in the length direction of the reaction zone where the first starting point is positioned as a reference; the sixth welding path end point is superposed with the first welding path starting point;
g moving the laser beam in the direction of the second fluid medium area to perform a seventh welding path;
h moving the laser beam towards the second terminal side to implement the operation of an eighth welding path;
i, moving the laser beam in a direction far away from the reaction zone to implement the operation of a ninth welding path;
j moving the laser beam in the direction of the second end point side to perform the operation of the tenth welding path;
k moving the laser beam toward the reaction zone to perform an eleventh welding path;
moving the laser beam in the direction of the second terminal point side to perform the operation of the twelfth welding path;
moving the laser beam towards the first terminal side to implement a thirteenth welding path, wherein two ends of the thirteenth welding path are respectively arc-shaped sections of a quarter of a circle, and enabling the thirteenth welding path to finish the movement of the laser beam towards the first starting point side; the output power begins to decrease when the laser beam moves to a first power attenuation point; then moving to a first terminal point to finish irradiation;
n laser beams start to irradiate the unipolar plate from the second starting point and move relative to the unipolar plate, and reach the set output power when moving to the second power peak point; then the laser beam moves towards the direction of the second fluid medium area to implement the operation of a fourteenth welding path and reaches a second power attenuation point, the output power of the laser beam is reduced, and the laser beam moves to a second terminal point to finish irradiation;
the laser beam moves in a spiral line mode, the diameter of each welding spot formed by the laser beam moving in the spiral line mode is 0.05-0.30mm, adjacent welding spots are provided with overlapped parts which are mutually overlapped, and the area of the overlapped parts is smaller than that of any one welding spot;
the area of the overlapping part is 10% -70% of the area of any one welding spot;
the relative movement speed of the laser beam is 2-15 mm/s.
2. Welding method according to claim 1, characterized in that said laser beams are two in number.
3. The welding method according to any one of claims 1 to 2, wherein the laser beam output power is 10-100W and the pulse frequency is 500-3000 Hz.
4. The welding method according to claim 3, wherein two unipolar plates of the metallic bipolar plate are an anode plate and a cathode plate, the anode plate and the cathode plate having a thickness of 0.05-0.30 mm.
5. The welding method of claim 3, wherein the weld initiation buffer path and the weld termination buffer path are separated by a distance of less than or equal to 1 cm.
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| CN110303246B (en) * | 2019-07-29 | 2021-10-29 | 武汉华工激光工程有限责任公司 | Seal welding method and bipolar plate |
| CN110518269A (en) * | 2019-08-27 | 2019-11-29 | 浙江锋源氢能科技有限公司 | The welding method of fuel battery metal double polar plate |
| CN111451638B (en) * | 2020-04-10 | 2021-11-02 | 北京新研创能科技有限公司 | Fuel cell metal bipolar plate and welding method thereof |
| CN113020794B (en) * | 2021-03-31 | 2023-03-24 | 龙俊耀 | Ultrahigh-speed precise welding process and welding clamp for hydrogen energy automobile bipolar plate |
| CN114178694A (en) * | 2022-01-11 | 2022-03-15 | 深圳市联赢激光股份有限公司 | Preparation method of collector plate of hydrogen fuel cell, collector plate, preparation equipment and storage medium |
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