CN217069443U - Bipolar plate dispensing equipment for proton exchange membrane fuel cell - Google Patents
Bipolar plate dispensing equipment for proton exchange membrane fuel cell Download PDFInfo
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- CN217069443U CN217069443U CN202220503346.3U CN202220503346U CN217069443U CN 217069443 U CN217069443 U CN 217069443U CN 202220503346 U CN202220503346 U CN 202220503346U CN 217069443 U CN217069443 U CN 217069443U
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Abstract
The bipolar plate dispensing equipment for the proton exchange membrane fuel cell comprises a base, wherein two ends of the base are respectively fixedly connected with a rack, the rack is connected with a turnover assembly through a rotating shaft, and the rack is connected with the rotating shaft through a transmission assembly to drive the turnover assembly to move so as to complete double-sided dispensing; the turning assembly comprises two turning driving connecting rods which are arranged in parallel, the turning driving connecting rods are movably connected with the rotating shaft respectively, two turning driven connecting rods which are arranged in parallel are arranged between the two turning driving connecting rods, the turning driving connecting rods and the turning driven connecting rods are matched to form a hollowed turning dispensing area for double-sided dispensing of the bipolar plate, clamping assemblies are arranged at four corners or four edges of the hollowed turning dispensing area respectively, and the clamping assemblies are used for connecting the turning driving connecting rods and the turning driven connecting rods and fixedly clamping the bipolar plate in the hollowed turning dispensing area; and the base is also provided with a detection assembly, and the detection assembly is used for detecting and judging whether glue exists on the bipolar plate.
Description
The technical field is as follows:
the utility model relates to a bipolar plate dispensing equipment for proton exchange membrane fuel cell.
Background art:
the hydrogen-oxygen proton exchange membrane fuel cell is a fuel cell type which is applied on a large scale at present, and is widely used in various application scenes such as passenger cars, forklifts, trucks, buses, ships, unmanned planes and the like, the core component of the hydrogen-oxygen proton exchange membrane fuel cell is a fuel cell stack, a membrane electrode assembly is firstly formed by a proton exchange membrane, a gas diffusion layer and the like, a membrane electrode assembly is clamped by two bipolar plates to form a cell unit, and a plurality of cell units are stacked in series to form the fuel cell stack.
The electric pile is the place where the electrochemical reaction takes place, and hydrogen and air are uniformly and alternately distributed between the bipolar plate and the membrane electrode through respective air inlet pipelines and specially designed flow channels. They are respectively used as fuel and oxidant, and can produce electrochemical reaction under the action of catalyst and proton exchange membrane, etc. to directly release electric energy. Meanwhile, the cooling liquid in the cooling loop is responsible for reaction temperature control. In the serial stack structure of tens or hundreds of bipolar plates and membrane electrodes, it is required to ensure that fuel, oxidant and coolant do not leak and leak, so the sealing process is one of the most important processes, in which hydrogen is used as the gas with the minimum molecular weight and combustibility, and the requirements for the sealing process are extremely strict.
Common bipolar plate sealing technologies mainly include dispensing, injection molding, screen printing + injection molding, laser welding, and the like. In any sealing technology, the cooling surfaces of two unipolar plates are firstly attached to form a bipolar plate with two working surfaces, and then each working surface of the bipolar plate is sealed; the dispensing technology has the advantages of maturity, stability and flexible process, particularly, the same set of equipment can quickly adapt to different bipolar plates and membrane electrode types, and the dispensing equipment is very suitable for market requirements of quick iteration of new products and various demands. However, the technology has the disadvantages of low productivity, high equipment cost and the like, and the further application of the technology is limited.
The current working face dispensing is carried out as follows: fixing the bipolar plate on a platform to enable one working surface to be glued to face upwards, pushing viscous liquid glue by using a glue gluing control valve, a vision calibration system and the like, forming a required adhesive tape shape in a glue groove of the bipolar plate by using needle heads with different thicknesses, then placing the bipolar plate in a curing furnace, and curing the viscous glue by using a heat drying or ultraviolet irradiation method. And then, turning over the bipolar plate, putting the working surface which is not glued upwards on another glue dispensing carrier for second glue dispensing and then secondary curing.
Obviously, the curing process is performed twice, and the required curing equipment and time are increased accordingly. If use under the thermocuring condition, when solidifying the second face, the sealed glue that has solidified to a certain extent earlier stage will solidify again, causes the excessive solidification of first face sealed glue easily, reduces the adhesive tape performance.
Therefore, the dispensing and sealing technology has problems of low production efficiency, high equipment investment, easy over-curing, process defect initiation, and the like.
The utility model has the following contents:
the embodiment of the utility model provides an equipment is glued to bipolar plate point for proton exchange membrane fuel cell, structural design is reasonable, based on mutually supporting of a plurality of functional unit on the equipment, merge twice solidification process and be once, can show the production efficiency who promotes the working face point and glue, simplify the actual operation step, thereby optimize the point and glue technology, reduce the solidification loss of sealing member, avoid the secondary solidification phenomenon, promote the life of sealing member, and reduce the production time, save equipment and drop into, reduce and produce line occupation space, the problem that exists among the prior art has been solved.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
the bipolar plate dispensing equipment for the proton exchange membrane fuel cell comprises a base, wherein two ends of the base are respectively fixedly connected with a rack, the rack is connected with a turnover assembly through a rotating shaft, and the rack is connected with the rotating shaft through a transmission assembly to drive the turnover assembly to move so as to complete double-sided dispensing; the turning assembly comprises two turning driving connecting rods which are arranged in parallel, the turning driving connecting rods are movably connected with the rotating shaft respectively, two turning driven connecting rods which are arranged in parallel are arranged between the two turning driving connecting rods, the turning driving connecting rods and the turning driven connecting rods are matched to form a hollowed turning dispensing area for double-sided dispensing of the bipolar plate, clamping assemblies are arranged at four corners or four edges of the hollowed turning dispensing area respectively, and the clamping assemblies are used for connecting the turning driving connecting rods and the turning driven connecting rods and fixedly clamping the bipolar plate in the hollowed turning dispensing area; and the base is also provided with a detection assembly, and the detection assembly is used for detecting and judging whether glue exists on the bipolar plate.
The transmission assembly comprises a turnover cylinder arranged on the inner side of the rack, a driving wheel is connected to a piston rod of the turnover cylinder, the driving wheel is arranged on the outer side of the rack, a driven wheel is connected to the driving wheel through a conveying belt, the driven wheel is connected with a rotating shaft, an auxiliary wheel is arranged on the outer side of the rack, and the auxiliary wheel and the conveying belt are matched for use.
The clamping assembly is an elastic pneumatic mechanism and comprises a clamping block and a clamping cylinder, the clamping cylinder acts to drive the clamping block to act to fixedly clamp the bipolar plate, a clamping groove is formed in the inner side of the clamping block, and an oblique angle with a specific size needs to be machined in the clamping groove according to the thickness of the bipolar plate.
The turnover component comprises a dispensing carrying platform, an anti-sticking groove is arranged on the dispensing carrying platform and used for placing the bipolar plate and preventing the sealant from being adhered to the dispensing carrying platform, a plurality of fixing through holes are uniformly distributed on the outer side of the dispensing carrying platform and used for connecting the pneumatic pressing block to fix the bipolar plate on the dispensing carrying platform.
The bipolar plate is sucked and fixed on the overturning assembly through a mechanical arm sucker.
The detection assembly includes a proximity switch and a photosensor.
The utility model adopts the structure, the frame is connected with the turnover component through the rotating shaft to drive the turnover component to rotate so as to complete double-sided dispensing; the power is provided by the transmission assembly, so that the overturning assembly finishes overturning action; the overturning assemblies with two structures are suitable for different application scenes, so that the functionality of the dispensing equipment is enriched; fixedly clamping the bipolar plate by a clamping assembly of an elastic pneumatic mechanism; the manipulator sucker is used for sucking and fixing the bipolar plate, and the bipolar plate suction device has the advantages of accuracy, high efficiency, simplicity, convenience and practicability.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the transmission assembly of the present invention.
Fig. 3 is a schematic structural diagram of the base of the present invention.
Fig. 4 is a schematic structural view of a first embodiment of the turnover assembly of the present invention.
Fig. 5 is a schematic structural view of a second embodiment of the turnover assembly of the present invention.
In the figure, the device comprises a base 1, a base 2, a rack 3, a turnover driving connecting rod 4, a turnover driven connecting rod 5, a turnover cylinder 6, a driving wheel 7, a conveying belt 8, a driven wheel 9, an auxiliary wheel 10, a clamping block 11, a clamping cylinder 12, a glue dispensing carrying platform 13, an anti-sticking groove 14 and a fixing through hole.
The specific implementation mode is as follows:
in order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.
As shown in fig. 1-5, the bipolar plate dispensing device for the proton exchange membrane fuel cell comprises a base 1, wherein two ends of the base 1 are respectively fixedly connected with a rack 2, the rack 2 is connected with a turning assembly through a rotating shaft, and the rack 2 is connected with the rotating shaft through a transmission assembly to drive the turning assembly to move so as to complete double-sided dispensing; the turning assembly comprises two turning driving connecting rods 3 arranged in parallel, the turning driving connecting rods 3 are movably connected with the rotating shaft respectively, two turning driven connecting rods 4 arranged in parallel are arranged between the two turning driving connecting rods 3, the turning driving connecting rods 3 and the turning driven connecting rods 4 are matched to form a hollowed turning dispensing area for double-sided dispensing of the bipolar plate, clamping assemblies are arranged at four corners or four edges of the hollowed turning dispensing area respectively and are used for connecting the turning driving connecting rods 3 and the turning driven connecting rods 4 and fixedly clamping the bipolar plate in the hollowed turning dispensing area; the base 1 is also provided with a detection assembly, and the detection assembly is used for detecting and judging whether glue exists on the bipolar plate.
The transmission assembly comprises a turnover cylinder 5 arranged on the inner side of the frame 2, a driving wheel 6 is connected to a piston rod of the turnover cylinder 5, the driving wheel 6 is arranged on the outer side of the frame 2, a driven wheel 8 is connected to the driving wheel 6 through a conveying belt 7, the driven wheel 8 is connected with a rotating shaft, an auxiliary wheel 9 is arranged on the outer side of the frame 2, and the auxiliary wheel 9 and the conveying belt 7 are matched for use.
The clamping assembly is an elastic pneumatic mechanism and comprises a clamping block 10 and a clamping cylinder 11, the clamping cylinder 11 acts to drive the clamping block 10 to act to fixedly clamp the bipolar plate, a clamping groove is formed in the inner side of the clamping block 10, and an oblique angle with a specific size needs to be machined according to the thickness of the bipolar plate.
The overturning assembly comprises a dispensing carrying platform 12, an anti-sticking groove 13 is formed in the dispensing carrying platform 12, the anti-sticking groove 13 is used for placing the bipolar plate and preventing the bipolar plate from being adhered to the dispensing carrying platform 12, a plurality of fixing through holes 14 are uniformly distributed on the outer side of the dispensing carrying platform 12, and the fixing through holes 14 are used for being connected with a pneumatic pressing block to fix the bipolar plate on the dispensing carrying platform 12.
The bipolar plate is sucked and fixed on the overturning assembly through a mechanical arm sucker.
The detection assembly includes a proximity switch and a photosensor.
The embodiment of the utility model provides an in proton exchange membrane is bipolar plate dispensing equipment's for fuel cell theory of operation does: based on the mutual cooperation of a plurality of functional assemblies such as transmission assembly, upset subassembly and clamping components on the equipment, can show the whole production efficiency that improves the technology of gluing, simplify the actual operation step, thereby optimize the technology of gluing, reduce the solidification loss of sealing member, avoid the secondary cure phenomenon, promote the life of sealing member, save production time, save equipment input, reduce and produce line occupation space, compare with current "the one side is glued to the point, after the solidification, glue again" traditional handicraft, the curing time of sealed glue has been reduced, and is high in compatibility, be favorable to developing the fuel cell process technology optimization that changes year by year.
In the integral scheme, the bipolar plate mainly comprises a base 1, wherein a transmission assembly, a turnover assembly and a clamping assembly which are matched to act are arranged on the base 1 so as to finish double-sided dispensing of the bipolar plate; two different embodiment configurations are mainly included for the flip assembly.
As shown in fig. 4, in the first embodiment, the flipping assembly includes two flipping driving connecting rods 3 arranged in parallel, the flipping driving connecting rods 3 are movably connected to the rotating shaft respectively, two flipping driven connecting rods 4 arranged in parallel are arranged between the two flipping driving connecting rods 3, the flipping driving connecting rods 3 and the flipping driven connecting rods 4 cooperate to form a hollow flipping dispensing area for dispensing two sides of the bipolar plate, and a dispensing manner suspended in the middle is adopted to prevent the device from touching the liquid sealant.
As shown in fig. 5, in the second embodiment, the flip-flop assembly includes a dispensing carrier 12, an anti-adhesive groove 13 is formed on the dispensing carrier 12, the anti-adhesive groove 13 is used for placing the bipolar plate and preventing the sealant from being adhered to the dispensing carrier 12, a plurality of fixing through holes 14 are uniformly distributed on the outer side of the dispensing carrier 12, the fixing through holes 14 are used for connecting a pneumatic pressing block to fix the bipolar plate on the dispensing carrier 12, and the sealant is prevented from contacting the dispensing carrier 12 due to the arrangement of the anti-adhesive groove 13; in the whole process, each pneumatic pressing block can act independently to press the bipolar plate on the dispensing carrier 12, so that the bipolar plate can be prevented from falling off or deviating.
Preferably, the transmission assembly is connected with action wheel 6 including setting up at 2 inboard upset cylinders 5 in the frame on upset cylinder 5's piston rod, action wheel 6 sets up in 2 outsides in the frame, is connected with from driving wheel 8 through conveyer belt 7 on action wheel 6, link to each other with the pivot from driving wheel 8, is equipped with auxiliary wheel 9 in 2 outsides in the frame, auxiliary wheel 9 and the cooperation of conveyer belt 7 are used, can drive the upset subassembly and rotate 180 and accomplish two-sided point and glue, and action wheel 6, cooperate from driving wheel 8 and auxiliary wheel 9, make the conveyer belt action more smooth, avoid appearing the card pause phenomenon.
Preferably, the clamping assembly is an elastic pneumatic mechanism and comprises a clamping block 10 and a clamping cylinder 11, the clamping cylinder 11 acts to drive the clamping block 10 to act to fixedly clamp the bipolar plate, a clamping groove is formed in the inner side of the clamping block 10, and the bipolar plate is uniformly clamped and fixed through the clamping blocks 10 on four corners or four edges, so that the stress of the bipolar plate is balanced, and the liquid sealant is prevented from being touched.
During the in-service use, at first place the bipolar plate of treating processing and glue on gluing the microscope carrier and carry out the point, accomplish one side after, the manipulator sucking disc picks up bipolar plate, send to in the upset subassembly, come centre gripping fixed bipolar plate through the clamping groove of clamping components, drive assembly drives the upset of upset subassembly, make the other side of bipolar plate upwards, the manipulator sucking disc picks up bipolar plate once more, send again to the microscope carrier of gluing and carry out the operation of gluing at the another side, thereby reduce the sealed glue curing process of bipolar plate working face once, save production time, save equipment input, reduce and produce line occupation space.
Specifically, the bipolar plate without dispensing is fixed on the dispensing carrier, and the dispensing carrier can adopt vacuum adsorption or pneumatic clamping, so that the bipolar plate is tightly attached to the platform. The glue dispensing needle head, the glue dispensing control valve and the like are fixed on the mechanical movement device to realize three-dimensional movement relative to the bipolar plate. The three-dimensional movement can be completely realized by a moving device for fixing the needle head and the dispensing control valve, such as a three-axis manipulator, a six-axis manipulator and the like; the dispensing platform and the dispensing control valve can also be used together, for example, the platform can perform x-axis horizontal movement, and the needle head and the dispensing control valve can perform y-axis and z-axis movement. The dispensing control valve preferably adopts a high-precision electric screw valve, and can also adopt other electric or pneumatic control valves to be responsible for the dispensing control of the needle head. The sealant is supplied by a glue barrel, the glue barrel can be fixed and connected to the glue dispensing control valve, moves together with the glue valve and can also be externally arranged, and the sealant is remotely conveyed through a flexible pipeline. The glue valve, the glue barrel or the connection section of the glue valve and the glue barrel can be additionally provided with a temperature control device for improving the temperature stability of the sealant when the sealant is discharged. The dispensing carrying platform is smooth, the levelness is accurately calibrated, and a laser detector and a motion compensation program can be used in the motion control process of the dispensing control valve/needle head to ensure the stability of the glue shape; the dispensing carrying platform can be additionally provided with a temperature control device such as a temperature measuring instrument, a heater, a radiating fin, a freezing water pipe and the like for controlling the temperature during dispensing.
The needed glue shape is dispensed in a glue dispensing groove on the bipolar plate by the glue dispensing system, after glue dispensing is completed, an online optical detection device can be arranged nearby to perform glue shape detection, namely after glue dispensing is completed, a glue dispensing carrier is automatically moved to a detection area outside a glue dispensing area to perform detection, the same glue dispensing carrier is additionally used for glue dispensing operation in the glue dispensing area, so that the glue shape detection does not affect the beat of the glue dispensing operation, and after detection, the glue dispensing carrier is grabbed by a mechanical arm with a vacuum chuck or a pneumatic clamping jaw and placed into a next working module, namely an unqualified temporary storage tool or an overturning platform. This glue shape testing process also can adopt the mode of not occupying point and gluing the microscope carrier to go on, should move away immediately after gluing the completion this moment and glue valve to safe position, snatch bipolar plate with the manipulator, place bipolar plate upset platform on, the upset platform is used for accomplishing bipolar plate's turn-over, integrates as required to have functions such as temperature control, horizontal upset, glue shape and detect. The overturning platform is made of a metal material with high heat conductivity coefficient, such as aluminum alloy and carbon steel, a cooling temperature control device is arranged in the overturning platform and used for rapidly reducing the temperature of the bipolar plate so as to reduce the fluidity of glue, online optical detection equipment can be arranged on the overturning platform, and rapid glue shape detection is carried out by utilizing the buffering time of temperature control; then clamping the bipolar plate by using a turning tool, and turning the bipolar plate by 180 degrees by taking the short edge of the bipolar plate as an axis so that the working surface without glue dispensing is upward and the working surface after glue dispensing is downward; then moving the bipolar plate at a constant speed and placing the bipolar plate on a glue dispensing carrying platform for secondary glue dispensing, or grabbing the bipolar plate by a manipulator for moving; a groove is designed on the dispensing carrying platform for the secondary dispensing, and the shape of the adhesive tape corresponds to that of the adhesive tape during the primary dispensing, so that the uncured glue is prevented from being damaged due to the contact with the platform; the platform for dispensing the first working surface and the second working surface can be the same, and can also respectively use independent platforms according to capacity requirements and equipment conditions. And the two working surfaces are subjected to glue dispensing and qualified bipolar plates are detected, pushed into a curing tool one by one, and sent into a curing furnace after the tool is full of materials. Some ultraviolet curing furnaces do not need special tools, and can be directly placed on a conveyor belt to be conveyed into the furnace. After the solidification is finished, the glue shape parameters of the upper working surface and the lower working surface, such as the height, the width and the like of the glue strip, are checked in a sampling mode, and the glue dispensing technological parameters are calibrated according to the glue shape parameters after the solidification. Therefore, the dispensing operation of the two working surfaces can be completed by only one-time curing.
It is particularly noted that the bipolar plate dispensing device for proton exchange membrane fuel cell in the embodiment of the present invention can be applied to sealants with viscosity greater than 500Pa · s, and can be almost applied to all olefin series and silica gel series sealant models in the current market.
To sum up, the embodiment of the present invention provides a bipolar plate dispensing device for proton exchange membrane fuel cell, which is based on the mutual cooperation of a plurality of functional components such as a transmission component, a turning component and a clamping component on the device, and can significantly improve the overall production efficiency of the dispensing process and simplify the actual operation steps, thereby optimizing the dispensing process, reducing the curing loss of the sealing member, avoiding the secondary curing phenomenon, prolonging the service life of the sealing member, saving the production time, saving the investment of the curing device, reducing the occupied space of the production line, dispensing the side after curing, and dispensing the glue after curing, and reducing the curing time of the sealing glue, and has strong compatibility, thereby being beneficial to the optimization of the fuel cell process technology which develops and changes year by year; the method has the advantages that the method obviously improves the production efficiency of the process while keeping the advantages of the dispensing process, further avoids the secondary curing phenomenon, creatively promotes the improvement of the process, and passes batch verification on an automatic production line.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (6)
1. The bipolar plate dispensing equipment for the proton exchange membrane fuel cell is characterized in that: the double-side dispensing machine comprises a base, wherein two ends of the base are fixedly connected with a rack respectively, the rack is connected with a turnover assembly through a rotating shaft, and the rack is connected with the rotating shaft through a transmission assembly to drive the turnover assembly to move so as to complete double-side dispensing; the turning assembly comprises two turning driving connecting rods which are arranged in parallel, the turning driving connecting rods are movably connected with the rotating shaft respectively, two turning driven connecting rods which are arranged in parallel are arranged between the two turning driving connecting rods, the turning driving connecting rods and the turning driven connecting rods are matched to form a hollowed turning dispensing area for double-sided dispensing of the bipolar plate, clamping assemblies are arranged at four corners or four edges of the hollowed turning dispensing area respectively, and the clamping assemblies are used for connecting the turning driving connecting rods and the turning driven connecting rods and fixedly clamping the bipolar plate in the hollowed turning dispensing area; and the base is also provided with a detection assembly, and the detection assembly is used for detecting and judging whether glue exists on the bipolar plate.
2. The bipolar plate dispensing device for a pem-fuel cell according to claim 1, wherein: the transmission assembly comprises a turnover cylinder arranged on the inner side of the rack, a driving wheel is connected to a piston rod of the turnover cylinder, the driving wheel is arranged on the outer side of the rack, a driven wheel is connected to the driving wheel through a conveying belt, the driven wheel is connected with a rotating shaft, an auxiliary wheel is arranged on the outer side of the rack, and the auxiliary wheel and the conveying belt are matched for use.
3. The bipolar plate dispensing device for a pem-fuel cell according to claim 1, wherein: the clamping assembly is an elastic pneumatic mechanism and comprises a clamping block and a clamping cylinder, the clamping cylinder acts to drive the clamping block to act to fixedly clamp the bipolar plate, a clamping groove is formed in the inner side of the clamping block, and an oblique angle with a specific size needs to be machined in the clamping groove according to the thickness of the bipolar plate.
4. The bipolar plate dispensing device for a pem-fuel cell according to claim 1, wherein: the overturning assembly comprises a dispensing carrying platform, an anti-sticking groove is formed in the dispensing carrying platform and used for placing the bipolar plate and preventing the sealing glue from being connected to the dispensing carrying platform, a plurality of fixing through holes are uniformly distributed in the outer side of the dispensing carrying platform and used for connecting the pneumatic pressing block to fix the bipolar plate on the dispensing carrying platform.
5. The bipolar plate dispensing device for a pem-fuel cell according to claim 1, wherein: the bipolar plate is sucked and fixed on the overturning assembly through a mechanical arm sucker.
6. The bipolar plate dispensing device for a pem-fuel cell according to claim 1, wherein: the detection assembly includes a proximity switch and a photosensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220503346.3U CN217069443U (en) | 2022-03-08 | 2022-03-08 | Bipolar plate dispensing equipment for proton exchange membrane fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220503346.3U CN217069443U (en) | 2022-03-08 | 2022-03-08 | Bipolar plate dispensing equipment for proton exchange membrane fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217069443U true CN217069443U (en) | 2022-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220503346.3U Active CN217069443U (en) | 2022-03-08 | 2022-03-08 | Bipolar plate dispensing equipment for proton exchange membrane fuel cell |
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| Country | Link |
|---|---|
| CN (1) | CN217069443U (en) |
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- 2022-03-08 CN CN202220503346.3U patent/CN217069443U/en active Active
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