CN116060766A - Welding method and device for metal bipolar plate, electronic equipment and storage medium - Google Patents

Welding method and device for metal bipolar plate, electronic equipment and storage medium Download PDF

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Publication number
CN116060766A
CN116060766A CN202211678721.9A CN202211678721A CN116060766A CN 116060766 A CN116060766 A CN 116060766A CN 202211678721 A CN202211678721 A CN 202211678721A CN 116060766 A CN116060766 A CN 116060766A
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China
Prior art keywords
welding
flow field
plate
bipolar plate
area
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CN202211678721.9A
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Inventor
薛龙昌
张擘
刘佰博
郭玉
张晗
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CRRC Industry Institute Co Ltd
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CRRC Academy Co Ltd
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Priority to CN202211678721.9A priority Critical patent/CN116060766A/en
Publication of CN116060766A publication Critical patent/CN116060766A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention provides a welding method and device of a metal bipolar plate, electronic equipment and a storage medium, wherein the method comprises the following steps: positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area; and welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate. Different welding modes are adopted for different welding seams, so that the suitability of welding is improved, the heat input caused by the welding mode of non-adaptation is further reduced, and the welding deformation caused by welding of the metal bipolar plate can be effectively avoided.

Description

Welding method and device for metal bipolar plate, electronic equipment and storage medium
Technical Field
The present invention relates to the field of fuel cell technologies, and in particular, to a method and apparatus for welding a metal bipolar plate, an electronic device, and a storage medium.
Background
The metal bipolar plate is formed by connecting yin-yang monopolar plates, and the connecting joint has the characteristics of good tightness, strong corrosion resistance, high reliability and the like. The fiber laser welding method has the advantages of high welding speed, concentrated power density and the like, and becomes a main connection mode of the metal bipolar plate. However, the plate raw material is a stainless steel ultrathin plate with the thickness of 0.1mm, and the welding path is closed and is restrained by a welding clamp, so that larger local deformation and overall deformation are easy to generate after welding. The serious deformation of the polar plate causes uneven pressure distribution of the galvanic pile, and the contact resistance between the polar plate and the gas diffusion layer is increased, thereby restricting the improvement of the performance of the fuel cell.
Today, the welding stress and deformation are important indexes for the construction quality safety of the welded structure. It follows that the effect of welding stresses and deformations on the welding quality and structural safety must be taken into account when solving engineering practical problems. In particular, the welded structure of the sheet member is more severely deformed due to the poor deformation resistance of the sheet itself.
Disclosure of Invention
The invention provides a welding method and device of a metal bipolar plate, electronic equipment and a storage medium, which are used for solving the problem that the welding deformation of the bipolar plate is serious in the prior art.
The invention provides a welding method of a metal bipolar plate, which comprises the following steps:
positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area;
and welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
According to the welding method of the metal bipolar plate provided by the invention, the welding of the sealing area welding seam corresponding to the sealing area and the welding seam of the flow field area corresponding to the flow field area is performed by using a laser, and the welding method comprises the following steps:
and carrying out zero defocusing welding on the welding seam of the sealing area corresponding to the sealing area by using a laser, and carrying out welding on the welding seam of the flow field area corresponding to the flow field area by using the laser.
According to the welding method of the metal bipolar plate, the welding seam of the sealing area is a continuous welding seam.
According to the welding method of the metal bipolar plate, the welding seams of the flow field area are a plurality of discontinuous welding seams.
According to the welding method of the metal bipolar plate provided by the invention, the welding seam of the flow field area corresponding to the flow field area is welded by using a laser, and the welding method comprises the following steps:
and selecting a plurality of welding seams from the welding seams of the flow field area, and welding the selected welding seams by using a laser.
According to the welding method of the metal bipolar plate, when the welding of the sealing area is finished, the width of the welding line is 0.1-0.14mm.
According to the welding method of the metal bipolar plate, when welding is completed, the width of the welding seam of the flow field area is 0.25-0.3mm.
The invention also provides a welding device of the metal bipolar plate, which comprises the following steps:
the positioning and attaching module is used for positioning and attaching the cathode plate and the anode plate of the metal bipolar plate and dividing the attached plate into a sealing area and a flow field area;
and the laser welding module is used for welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser and welding the cathode plate and the anode plate.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of welding a metallic bipolar plate as described in any one of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of welding a metallic bipolar plate as described in any of the above.
According to the welding method, the device, the electronic equipment and the storage medium for the metal bipolar plate, when the bipolar plate of the fuel cell is subjected to laser welding, the cathode plate and the anode plate of the bipolar plate are positioned and attached, so that welding seams between the bipolar plates correspond, meanwhile, the area to be welded is divided into a sealing area and a flow field area, when welding is carried out, different welding modes are adopted for different areas, the suitability of welding is improved, heat input caused by the welding modes which are not suitable is reduced, and welding deformation of the metal bipolar plate caused by welding is effectively avoided.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for welding a metallic bipolar plate provided by the invention;
FIG. 2 is a schematic illustration of a plate of a metallic bipolar plate provided by the present invention;
FIG. 3 is a schematic view of a weld metallographic diagram of a seal region weld provided by the invention;
FIG. 4 is a schematic view of a weld metallographic diagram of a weld of a flow field region provided by the invention;
fig. 5 is a schematic structural view of a welding device for metal bipolar plates according to the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for welding the metal bipolar plate according to the present invention is described below with reference to fig. 1 to 5, and by using the method described according to the present invention, welding accuracy is improved and welding deformation of the metal bipolar plate due to heat input is avoided during welding of the metal bipolar plate of the fuel cell.
Fig. 1 is a flow chart of a method for welding a metal bipolar plate according to the present invention, as shown in fig. 1, the method includes steps 101 to 102.
And 101, positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded anode plate into a sealing area and a flow field area.
In the welding process of the metal bipolar plate of the fuel cell, the metal bipolar plate is fixedly placed at first, and meanwhile, the cathode plate and the anode plate of the bipolar plate are subjected to bonding treatment, so that the welding treatment is performed after bonding. Specifically, before welding, the cathode plate and the anode plate of the metal bipolar plate are subjected to positioning lamination, and after the positioning lamination is completed, the bipolar plate is divided into a sealing area and a flow field area, wherein the sealing area is used for sealing the bipolar plate, and the sealing area is used for processing, so that the space in the bipolar plate is ensured to be in a sealing state.
After the metal bipolar plate is positioned and attached, the metal bipolar plate is subjected to welding treatment, and before welding, the welding area of the bipolar plate can be divided into two areas including a sealing area and a flow field area, wherein the welding seam of the sealing area is used for guaranteeing the air tightness of the metal bipolar plate, and independent spaces are provided for a water cavity, an oxygen cavity and a hydrogen cavity in the metal bipolar plate under the condition of guaranteeing the overall tightness of the bipolar plate.
Taking the metal bipolar plate shown in fig. 2 as an example, fig. 2 is a schematic diagram of a plate of the metal bipolar plate provided by the invention. As shown in fig. 2, the areas 4, 5 and 6 in fig. 2 are respectively independent cavities, namely an oxygen cavity, a water cavity and a hydrogen cavity, and when welding is performed, the sealing area is the area corresponding to the welding seam 1, other areas can be classified into a flow field area, and the flow field area comprises welding seams shown in fig. 2, namely the welding seams of the flow field area. And then welding the welding seam by using a laser when welding treatment is carried out, so as to realize the welding of the cathode plate and the anode plate of the metal bipolar plate.
And 102, welding a sealing area welding line corresponding to the sealing area and a flow field area welding line corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
After the cathode plate and the anode plate of the metal bipolar plate are positioned and attached, a welding treatment is performed. Specifically, welding is performed on a sealing area welding line corresponding to the sealing area and a flow field area welding line corresponding to the flow field area respectively so as to realize welding of the cathode plate and the anode plate.
In one embodiment, when the welding process is performed, the welding process is performed on the basis of different manners, such as different welding processes, for the weld seams corresponding to the seal area and the flow field area. Specifically, when welding, it includes: and carrying out zero defocusing welding on the welding seams of the sealing areas corresponding to the sealing areas by using a laser, and carrying out welding on the welding seams of the flow field areas corresponding to the convection field areas by using the laser.
That is, when welding, different welding modes are adopted for the sealing area and the flow field area according to the difference between the areas and the requirements. When welding the welding seam of the sealing area, performing zero defocusing welding by using a laser, so that the welding seam of the sealing area is in a minimum melting width state after welding; and when welding the weld joint in the convection field region, the welding is performed in a manner of designing a short-line weld joint.
For example, for the sealing area welding seam, the main function is to ensure air tightness, in the actual operation process, the sealing area can be subjected to rubberizing treatment at the sealing place when being piled up, and the sealing area receives adhesive tape pressure at the sealing place when being used. In order to reduce heat input in the welding process and avoid deformation of the polar plates caused by welding, the welding seam design can adopt a laser with zero defocus at the moment so as to ensure the size of the welding seam in the minimum melting width state. The welding seam is a continuous welding seam and mainly plays a role in preventing the mutual channeling among a water cavity, an oxygen cavity and a hydrogen cavity in the metal bipolar plate.
Thus, for the seal zone weld, it may be provided as a continuous weld.
In addition, for the welding seam of the flow field area, the main function is to connect the cathode plate and the anode plate and to conduct electricity. Therefore, under the condition of ensuring the electric conduction requirement, the design of a short-line welding seam can be adopted, so that the heat input caused by overlong and too wide welding seam is avoided, and the problem of deformation of the polar plate caused by the heat input can be effectively avoided.
In an embodiment, the flow field region weld may be provided as a discontinuous weld, and may be formed of a plurality of short line welds as shown in fig. 2, provided in the flow field region, and in the case of excessively long welding, the conductive connection between the cathode plate and the anode plate is achieved by welding the flow field region weld.
Further, in the cathode plate and the anode plate of the bipolar plate, when the flow field region welds are provided, the number to be provided is not limited, and is specifically set according to the practical situation, and it is generally selected when the number of welds is to be subjected to the welding process within an allowable range, wherein the allowable range is a range of the number of welds that the bipolar plate can contain. And when welding, a plurality of welding seams can be selected from the welding seams of the flow field area as welding objects, and the selected welding seams are further welded, and the method specifically comprises the following steps: and selecting a plurality of welding seams from the welding seams of the flow field area, and welding the selected welding seams by using a laser. By randomly selecting a plurality of welding seams as the welding objects, and then using the selected welding mode, the generation of heat input can be effectively reduced.
In addition, after the sealing region weld and the flow field region weld are welded based on the above-described manner, the width of the weld formed when the sealing region weld is completed may be between 0.1 and 0.14mm, and the metallographic phase of the welded weld is shown in fig. 3, and the width of the weld formed when the flow field region weld is completed may be between 0.25 and 0.3mm, and the metallographic phase of the welded weld is shown in fig. 4.
According to the method provided by the embodiment of the invention, when the bipolar plate of the fuel cell is subjected to laser welding, the cathode plate and the anode plate of the bipolar plate are positioned and attached at first, so that welding seams between the bipolar plates are corresponding, meanwhile, the area to be welded is divided into a sealing area and a flow field area, and further, when welding is carried out, different welding modes are adopted for different areas, so that the suitability of welding is improved, heat input caused by the non-adaptive welding mode is reduced, and further, welding deformation caused by welding of the metal bipolar plate is effectively avoided.
The welding device of the metal bipolar plate provided by the invention is described below, and the welding device of the metal bipolar plate and the welding method of the metal bipolar plate described below can be correspondingly referred to each other.
Fig. 5 is a schematic structural diagram of a welding device for metal bipolar plates according to the present invention, and as shown in fig. 5, a welding device 500 for metal bipolar plates includes:
the positioning and attaching module 501 is used for positioning and attaching the cathode plate and the anode plate of the metal bipolar plate, and dividing the attached plate into a sealing area and a flow field area;
and the laser welding module 502 is used for welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser and welding the cathode plate and the anode plate.
Based on the above embodiments, the laser welding module 502 is also configured to:
and carrying out zero defocusing welding on the welding seams of the sealing areas corresponding to the sealing areas by using a laser, and carrying out welding on the welding seams of the flow field areas corresponding to the convection field areas by using the laser.
Based on the above embodiments, the seal zone weld is a continuous weld.
Based on the above embodiments, the flow field welds are several non-continuous welds.
Based on the above embodiments, the laser welding module 502 is also configured to:
and selecting a plurality of welding seams from the welding seams of the flow field area, and welding the selected welding seams by using a laser.
Based on the above embodiments, the seal zone weld has a weld width of 0.1-0.14mm when the weld is completed.
Based on the above embodiments, the weld width of the flow field zone weld is 0.25-0.3mm when the weld is completed.
Fig. 6 is a schematic structural diagram of an electronic device according to the present invention, and as shown in fig. 6, the electronic device may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a method of bonding metallic bipolar plates, the method comprising: positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area; and welding the welding seam of the sealing area corresponding to the sealing area and the welding seam of the flow field area corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform a method of welding a metallic bipolar plate provided by the methods described above, the method comprising: positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area; and welding the welding seam of the sealing area corresponding to the sealing area and the welding seam of the flow field area corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method of welding a metallic bipolar plate provided by the above methods, the method comprising: positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area; and welding the welding seam of the sealing area corresponding to the sealing area and the welding seam of the flow field area corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method of welding a metallic bipolar plate comprising:
positioning and bonding a cathode plate and an anode plate of the metal bipolar plate, and dividing the bonded plate into a sealing area and a flow field area;
and welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser, and welding the cathode plate and the anode plate.
2. The welding method of a metal bipolar plate according to claim 1, wherein the welding of the seal region weld corresponding to the seal region and the flow field region weld corresponding to the flow field region using a laser comprises:
and carrying out zero defocusing welding on the welding seam of the sealing area corresponding to the sealing area by using a laser, and carrying out welding on the welding seam of the flow field area corresponding to the flow field area by using the laser.
3. The method of welding a metallic bipolar plate of claim 1, wherein said seal zone weld is a continuous weld.
4. The method of welding a metallic bipolar plate of claim 1, wherein said flow field welds are discontinuous welds.
5. The method for welding a metal bipolar plate according to claim 2, wherein the welding of the flow field region weld corresponding to the flow field region using a laser comprises:
and selecting a plurality of welding seams from the welding seams of the flow field area, and welding the selected welding seams by using a laser.
6. The method of welding a metallic bipolar plate according to claim 1, wherein the seal zone weld has a weld width of 0.1-0.14mm when the welding is completed.
7. The method of welding a metallic bipolar plate of claim 1, wherein the flow field region weld has a weld width of 0.25-0.3mm when the welding is completed.
8. A welding device for a metal bipolar plate, comprising:
the positioning and attaching module is used for positioning and attaching the cathode plate and the anode plate of the metal bipolar plate and dividing the attached plate into a sealing area and a flow field area;
and the laser welding module is used for welding the sealing area welding seam corresponding to the sealing area and the flow field area welding seam corresponding to the flow field area by using a laser and welding the cathode plate and the anode plate.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of welding a metallic bipolar plate according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements a method of welding a metallic bipolar plate according to any one of claims 1 to 7.
CN202211678721.9A 2022-12-26 2022-12-26 Welding method and device for metal bipolar plate, electronic equipment and storage medium Pending CN116060766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211678721.9A CN116060766A (en) 2022-12-26 2022-12-26 Welding method and device for metal bipolar plate, electronic equipment and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211678721.9A CN116060766A (en) 2022-12-26 2022-12-26 Welding method and device for metal bipolar plate, electronic equipment and storage medium

Publications (1)

Publication Number Publication Date
CN116060766A true CN116060766A (en) 2023-05-05

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Country Status (1)

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CN (1) CN116060766A (en)

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