CN114367740A - Destressing sealing welding method and welding stress control device for metal bipolar plate - Google Patents
Destressing sealing welding method and welding stress control device for metal bipolar plate Download PDFInfo
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- CN114367740A CN114367740A CN202210139894.7A CN202210139894A CN114367740A CN 114367740 A CN114367740 A CN 114367740A CN 202210139894 A CN202210139894 A CN 202210139894A CN 114367740 A CN114367740 A CN 114367740A
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- speed laser
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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
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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
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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Abstract
The invention discloses a destressing sealing welding method for a metal bipolar plate, which comprises the following processing steps: s1, positioning and clamping; s2, laser welding; firstly, completing first high-speed laser welding at the middle position of the welding track in the welding track, and then completing second and third high-speed laser welding at the edge position of the welding track in the welding track; the invention relates to a destressing sealing welding method and a welding stress control device for a metal bipolar plate. The stress-relief sealing welding method and the welding stress control device enable the stress deformation of the metal bipolar plate after high-speed laser welding to be extremely small, the welding quality to be high, the overall function to be perfect and the practicability to be strong.
Description
Technical Field
The invention relates to the technical field of fuel cell manufacturing, in particular to a metal bipolar plate stress-relief sealing welding method and a welding stress control device.
Background
Fuel cells are a very promising energy technology, and have many advantages over the existing conventional energy conversion technologies, including higher energy conversion efficiency, zero emission of pollutants, quiet operation without moving parts, and the like. There are many types of fuel cells, and this patent focuses on the field of proton exchange membrane fuel cells. Although pem fuel cells have many advantages, there are some problems to be solved.
In a pem fuel cell, the bipolar plate is the core component, and accounts for a considerable proportion of the total weight and cost of the fuel cell stack, and plays the following main roles: 1. the structure supporting function is realized for the electric pile; 2. providing a circulation channel for three media of hydrogen, air and cooling liquid for cooling the galvanic pile, and simultaneously isolating the three media; 3. and (4) conducting, and connecting the single cells in series to form a whole pile.
The common bipolar plate material of the proton exchange membrane fuel cell comprises a graphite plate and a metal plate, and for the metal bipolar plate, a stainless steel plate or a titanium plate with the plate thickness of about 0.1mm is commonly used for manufacturing. The common process is as follows: each bipolar plate is formed by laser welding an anode plate and a cathode plate to form a metal bipolar plate.
In the production process of the metal bipolar plate, a welding process for welding two single plates into one bipolar plate is a key process, and proper laser welding machines need to be selected when the process is finished, and meanwhile, the welded parts of the two plates need to be tightly attached together. And to ensure the close fit of two plates, there are two key factors: 1. two veneers must be flat; 2. the welding fixture is required to be capable of pressing the two plates tightly. The flatness of the single plate needs strict control of a stamping process and single plate detection to ensure; the welding fixture is required to compress two veneers, and the fixture is required to have larger clamping force and good fitting property with the veneers.
In the prior art, the metal bipolar plate is generally compressed in a physical contact manner by adopting a pressing plate, a buckle and other manners, so that when welding operation is performed, as rapid heat transfer cannot be realized between the metal bipolar plate and a clamped welding base, stress is concentrated on the metal bipolar plate after one-time welding forming along a welding track, the metal bipolar plate after being cooled to normal temperature has obvious welding deformation, production and manufacturing of subsequent fuel cells are influenced, and the overall effect is poor. Accordingly, the invention provides a metal bipolar plate stress-relief sealing welding method and a welding stress control device.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a destressing sealing welding method and a welding stress control device for a metal bipolar plate, wherein the destressing sealing welding method and the welding stress control device enable the metal bipolar plate subjected to high-speed laser welding to have extremely small stress deformation and high welding quality.
In order to solve the technical problem, the invention aims to realize that: the invention relates to a destressing sealing welding method for a metal bipolar plate, which comprises the following processing steps:
s1, positioning and clamping; paving a metal bipolar plate to be welded between the welding base and the welding pressing plate, and exposing a preset welding track;
s2, laser welding; the method comprises the steps of firstly completing first high-speed laser welding in a welding track, moving the first high-speed laser welding along the length direction of the welding track and locating the first high-speed laser welding at the middle position of the welding track, then completing second high-speed laser welding in the welding track, moving the second high-speed laser welding along the length direction of the welding track and locating the second high-speed laser welding at the edge position of the welding track, and finally completing third high-speed laser welding in the welding track, wherein the third high-speed laser welding moves along the length direction of the welding track and locates at the edge position of the welding track, a second high-speed laser welding track is arranged on one side of the first high-speed laser welding track, and a third high-speed laser welding track is arranged on the other side of the first high-speed laser welding track.
The invention is further configured to: in step S2, the movement start end of the first high-speed laser welding is close to the movement end of the second high-speed laser welding and close to the movement start end of the third high-speed laser welding; and the moving termination end of the first high-speed laser welding is close to the moving starting end of the second high-speed laser welding and the moving termination end of the third high-speed laser welding.
In step S1, the welding base and the welding pressure plate are both arranged on a welding stress control device;
welding stress control device includes the welding base, and the detachable of welding base's top is mated formation has the welding clamp plate, has laid the welding track on the welding clamp plate, and the orbital below of welding is equipped with a plurality of electromagnetic induction heaters of doing the interval along its extension orbit and arranging, and the electromagnetic induction heater is including establishing by heating member, the induction coil of suit on by the heating member on the welding base, the orbital below of welding is equipped with the cooling channel who sets up on the welding base, and the cooling channel is followed the orbital extension orbit of welding is laid, the port of giving vent to anger of cooling channel is linked together with the external world, and the port of admitting air is equipped with jet cooler.
The invention is further configured to: the split-flow valve set is connected in series between the jet cooler and the cooling channel through a pipeline, the heated body is provided with a split-flow channel penetrating through the heated body, a confluence port of the split-flow valve set is connected with the jet cooler through a pipeline, split ports are respectively connected with the split-flow channel one by one through pipelines, and one end of the split-flow channel, which is not connected with the split-flow valve set, is connected with the cooling channel.
The invention is further configured to: the welding machine is characterized in that a protection channel arranged on the welding base is further arranged below the welding track, the protection channel is also arranged along the extending track of the welding track, a plurality of exhaust ports arranged at intervals along the extending track of the protection channel are arranged on the welding base, one end of each exhaust port is connected with the protection channel, and the other end of each exhaust port is connected with the welding track.
The invention is further configured to: the cooling channel and the protection channel are integrally arranged.
The invention is further configured to: and rare gas is respectively conveyed into the cooling channel and the protection channel.
The invention is further configured to: the noble gas is argon.
The invention is further configured to: each electromagnetic induction heater is controlled by an independent circuit to operate.
In conclusion, the invention has the following beneficial effects:
1. the invention relates to a destressing sealing welding method for a metal bipolar plate, which is characterized in that three welding marks are welded in the same welding track in a reciprocating manner, so that the original connection strength is kept, the stress generated by each welding mark is reduced, the stress deformation is reduced, and the welding quality is improved;
2. the invention relates to a destressing sealing welding method of a metal bipolar plate, which shortens a welding path and improves the welding efficiency by adopting a multi-pass back-and-forth welding mode;
3. the welding stress control device provided by the invention has the advantages that the plurality of electromagnetic induction heaters are embedded along the way below the welding track and are electrified, so that the welding base below the welding track is heated and preheated, the temperature difference between the welding base and a welded bipolar plate is reduced, and the bipolar plate is prevented from being obviously deformed due to stress concentration in the welding process;
4. according to the welding stress control device, the cooling channel is arranged along the lower part of the welding track, and low-temperature gas is introduced into the cooling channel, so that the welding base below the welding track can be rapidly cooled, the effect of cooling the upper end and the lower end of the bipolar plate at the same speed is achieved, and the phenomenon that the temperature difference between the upper end and the lower end of the bipolar plate is large to cause the stress deformation of the bipolar plate to be cooled is avoided;
5. the welding stress control device provided by the invention has the advantages that the protection channel of the welding track is connected through the additional exhaust port, and argon is introduced inwards, so that when the welding operation is carried out along the welding track, oxygen is isolated by the argon, the sealing welding effect is achieved, and the welding quality is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a welded platen embodying the present invention;
FIG. 3 is a schematic view of the present invention with the weld platen removed;
FIG. 4 is a schematic view of a portion of the structure of the present invention;
FIG. 5 is an enlarged view of the portion A of FIG. 4;
FIG. 6 is a schematic view of the internal structure of the present invention;
FIG. 7 is a partial schematic view of the present invention;
FIG. 8 is a schematic diagram of the principle of the stress-free seal welding method of the present invention.
Detailed Description
For a better understanding of the technical solutions of the present invention, the following preferred embodiments of the present invention are described in conjunction with the specific examples, but it should be understood that the descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the patent claims of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention will be further described with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1 to 8, a method for welding a metal bipolar plate with a stress-relief seal according to the present embodiment includes the following steps:
s1, positioning and clamping; paving a metal bipolar plate to be welded between the welding base 1 and the welding pressing plate 2, and exposing a preset welding track 3;
s2, laser welding; the method comprises the steps of firstly completing first high-speed laser welding in a welding track 3, wherein the first high-speed laser welding moves along the length direction of the welding track and is positioned in the middle of the welding track, then completing second high-speed laser welding in the welding track, the second high-speed laser welding moves along the length direction of the welding track and is positioned at the edge position of the welding track, and finally completing third high-speed laser welding in the welding track, wherein the third high-speed laser welding moves along the length direction of the welding track and is positioned at the edge position of the welding track, the second high-speed laser welding track is arranged on one side of the first high-speed laser welding track, and the third high-speed laser welding track is arranged on the other side of the first high-speed laser welding track.
Further, in step S2, the movement start end of the first high-speed laser welding is close to the movement end of the second high-speed laser welding and close to the movement start end of the third high-speed laser welding; and the moving termination end of the first high-speed laser welding is close to the moving starting end of the second high-speed laser welding and the moving termination end of the third high-speed laser welding.
In step S1, the welding base and the welding pressure plate are both disposed on a welding stress control device;
the welding stress control device comprises a welding base 1, a welding pressing plate 2 is detachably paved above the welding base 1, a welding track 3 is arranged on the welding pressing plate 2, a plurality of electromagnetic induction heaters which are arranged at intervals along the extending track of the welding track 3 are arranged below the welding track 3, each electromagnetic induction heater comprises a heated body 4 arranged on the welding base 1 and an induction coil 5 sleeved on the heated body 4, a cooling channel 6 arranged on the welding base 1 is arranged below the welding track 3, the cooling channel 6 is arranged along the extending track of the welding track 3, an air outlet port of the cooling channel 6 is communicated with the outside, and an air inlet port is provided with an air injection cooler 7.
Furthermore, a flow dividing valve group 8 is connected in series between the jet cooler 7 and the cooling channel 6 through a pipeline, a flow dividing channel 9 penetrating through the heated body 4 is formed in the heated body, a confluence opening of the flow dividing valve group 8 is connected with the jet cooler 7 through a pipeline, flow dividing openings are respectively connected with the flow dividing channel 9 through pipelines one by one, and one end, which is not connected with the flow dividing valve group 8, of the flow dividing channel 9 is connected with the cooling channel 6.
Furthermore, a protection channel (not marked in the figure) arranged on the welding base 1 is further arranged below the welding track 3, the protection channel is also arranged along the extending track of the welding track 3, a plurality of exhaust ports 10 arranged at intervals along the extending track of the protection channel are arranged on the welding base 1, one end of each exhaust port 10 is connected with the protection channel, and the other end of each exhaust port is connected with the welding track 3.
Further, the cooling channel 6 and the protection channel are integrally arranged.
Further, rare gases are respectively conveyed into the cooling channel 6 and the protection channel; the noble gas is argon.
Further, each electromagnetic induction heater is controlled by an independent circuit to operate.
In the embodiment, the welding is carried out for a plurality of times (three times) in the same welding track to form three welding marks which are arranged at intervals, the first welding mark is arranged at the middle position of the welding track, the other two welding marks are arranged at the edge position of the welding track, after the first welding is finished, the two sides of the welding marks form stress deformation, and after the subsequent two welding marks and the subsequent three welding marks are finished, the stress deformation generated by the first welding can be compensated, so that the deformation quantity is reduced. It will also be appreciated that the stress deformation resulting from the second third weld properly restores the stress deformation resulting from the first weld.
Setting the moving starting end of the first high-speed laser welding to be close to the moving ending end of the second high-speed laser welding and to be close to the moving starting end of the third high-speed laser welding; the moving termination end of the first high-speed laser welding is set to be close to the moving starting end of the second high-speed laser welding and to be close to the moving termination end of the third high-speed laser welding, so that the welding path is in a reciprocating bending structure, the welding path is shortened, and the welding efficiency is improved.
In the present embodiment, during the welding of the metal bipolar plate by using the high-speed laser welding tool on the welding rail 3, the welding head of the welding tool moves along the welding rail 3, and the electromagnetic induction heater is disposed along the way below the welding rail 3, and as the welding head of the welding tool moves, the electromagnetic induction heater below the corresponding position can work in advance, preheat the corresponding position of the welding base 1, and reduce the temperature difference between the welding head and the welded bipolar plate. When the welded metal bipolar plate is cooled, low-temperature gas can be introduced into the cooling channel 6, so that the welding base 1 is rapidly cooled, and the upper end and the lower end of the metal bipolar plate can achieve the effect of cooling simultaneously.
Wherein the cryogenic gas is achieved by argon passing through the jet cooler 7 at positive pressure.
Through setting up cooling channel 6 and protection channel as an organic whole, make things convenient for the passageway processing, reduce welding base 1's the manufacturing degree of difficulty.
Wherein, set up independent control circuit to each electromagnetic induction heater, make each electromagnetic induction heater can operate alone, reach the effect of subregion control, the accurate temperature regulation in multiple spot position.
The invention relates to a destressing sealing welding method and a welding stress control device for a metal bipolar plate.A welding track is welded with three welding marks in a reciprocating way, so that the original connection strength is kept, the stress generated by each welding mark is reduced, the stress deformation is reduced, and the welding quality is improved; the method adopts a multi-pass back-and-forth welding mode, shortens the welding path and improves the welding efficiency; the device can heat and preheat the welding base below the welding track by embedding a plurality of electromagnetic induction heaters along the way below the welding track and electrifying the electromagnetic induction heaters, so that the temperature difference between the electromagnetic induction heaters and a welded bipolar plate is reduced, and the bipolar plate is prevented from obviously deforming in the welding process due to stress concentration; the device is provided with the cooling channel along the lower part of the welding track, and low-temperature gas is introduced into the cooling channel, so that the welding base below the welding track can be rapidly cooled, the effect of cooling the upper end and the lower end of the bipolar plate at the same speed is achieved, and the phenomenon that the temperature difference between the upper end and the lower end of the bipolar plate is large to cause the stress deformation of the bipolar plate to be cooled is avoided; the device establishes the gas vent through adding and connects welding track's protection passageway to internally let in argon gas, make welding track when doing welding operation on the way, carry out by the isolated oxygen of argon gas, reach sealed welding effect, improve welding quality, whole function is perfect, and the practicality is strong.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship actually shown, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, it is possible for those skilled in the art to combine the embodiments and understand the specific meanings of the above terms according to specific situations.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A stress-relief sealing welding method for a metal bipolar plate is characterized by comprising the following processing steps:
s1, positioning and clamping; paving a metal bipolar plate to be welded between the welding base and the welding pressing plate, and exposing a preset welding track;
s2, laser welding; the method comprises the steps of firstly completing first high-speed laser welding in a welding track, moving the first high-speed laser welding along the length direction of the welding track and locating the first high-speed laser welding at the middle position of the welding track, then completing second high-speed laser welding in the welding track, moving the second high-speed laser welding along the length direction of the welding track and locating the second high-speed laser welding at the edge position of the welding track, and finally completing third high-speed laser welding in the welding track, wherein the third high-speed laser welding moves along the length direction of the welding track and locates at the edge position of the welding track, a second high-speed laser welding track is arranged on one side of the first high-speed laser welding track, and a third high-speed laser welding track is arranged on the other side of the first high-speed laser welding track.
2. The method of claim 1, wherein in step S2, the moving start of the first high-speed laser welding is close to the moving end of the second high-speed laser welding and close to the moving start of the third high-speed laser welding; and the moving termination end of the first high-speed laser welding is close to the moving starting end of the second high-speed laser welding and the moving termination end of the third high-speed laser welding.
3. The method for welding a metal bipolar plate according to claim 1 or 2, wherein in step S1, the welding base and the welding pressure plate are both disposed on a welding stress control device;
welding stress control device includes the welding base, and the detachable of welding base's top is mated formation has the welding clamp plate, has laid the welding track on the welding clamp plate, and the orbital below of welding is equipped with a plurality of electromagnetic induction heaters of doing the interval along its extension orbit and arranging, and the electromagnetic induction heater is including establishing by heating member, the induction coil of suit on by the heating member on the welding base, the orbital below of welding is equipped with the cooling channel who sets up on the welding base, and the cooling channel is followed the orbital extension orbit of welding is laid, the port of giving vent to anger of cooling channel is linked together with the external world, and the port of admitting air is equipped with jet cooler.
4. The method for sealing and welding a metal bipolar plate according to claim 3, wherein a flow dividing valve set is connected in series between the gas injection cooler and the cooling channel through a pipe, the heated body is provided with a flow dividing channel for passing the heated body therethrough, the confluence ports of the flow dividing valve set are connected with the gas injection cooler through a pipe, the flow dividing ports are respectively connected with the flow dividing channels one by one through pipes, and the ends of the flow dividing channels, which are not connected with the flow dividing valve set, are connected with the cooling channel.
5. The method for sealing welding of metal bipolar plate with stress relief and welding stress control device according to claim 4, wherein a protection channel disposed on the welding base is disposed below the welding track, the protection channel is disposed along the extending track of the welding track, the welding base is disposed with a plurality of exhaust ports arranged at intervals along the extending track of the protection channel, one end of each exhaust port is connected to the protection channel, and the other end of each exhaust port is connected to the welding track.
6. The method of claim 5, wherein the cooling channels and the protection channels are integrally formed.
7. The method for welding a metal bipolar plate with a stress relief seal and the welding stress control device according to claim 6, wherein a rare gas is supplied into each of the cooling channel and the protection channel.
8. The method of claim 7, wherein the rare gas is argon.
9. The method of claim 3, wherein each of the electromagnetic induction heaters is controlled by an independent circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210139894.7A CN114367740A (en) | 2022-02-16 | 2022-02-16 | Destressing sealing welding method and welding stress control device for metal bipolar plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210139894.7A CN114367740A (en) | 2022-02-16 | 2022-02-16 | Destressing sealing welding method and welding stress control device for metal bipolar plate |
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| CN114367740A true CN114367740A (en) | 2022-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115555718A (en) * | 2022-12-06 | 2023-01-03 | 适新科技（苏州）有限公司 | Reduce stress deformation's metal bipolar plate laser welding device |
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2022
- 2022-02-16 CN CN202210139894.7A patent/CN114367740A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115555718A (en) * | 2022-12-06 | 2023-01-03 | 适新科技（苏州）有限公司 | Reduce stress deformation's metal bipolar plate laser welding device |
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Application publication date: 20220419 |