CN116207321A - High-power fuel cell pile press-fitting method and system thereof - Google Patents
High-power fuel cell pile press-fitting method and system thereof Download PDFInfo
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- CN116207321A CN116207321A CN202310431398.3A CN202310431398A CN116207321A CN 116207321 A CN116207321 A CN 116207321A CN 202310431398 A CN202310431398 A CN 202310431398A CN 116207321 A CN116207321 A CN 116207321A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2404—Processes or apparatus for grouping fuel cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
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- 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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Abstract
The invention provides a high-power fuel cell stack press-fitting method, belongs to the technical field of hydrogen fuel cell stack press-fitting, and solves the problem that press-fitting disqualification is easily caused by positioning accuracy in the prior art. The method comprises the following steps: performing tooling material spot inspection, determining that the size of a galvanic pile component meets the stacking requirement and the transferring position of a galvanic pile assembly is accurate, and performing tooling position accuracy check after preliminary lamination of a galvanic pile press-fitting tooling; performing stacking and pressing of the front end plates, and determining that the air tightness of the front end plates after stacking and pressing meets the set requirements; positioning the current collecting plate, paving an air, hydrogen and cooling liquid sealing ring between the end plate and the current collecting plate on the front end plate according to the positioning position, and stacking and pressing the negative current collecting plate after paving; the bipolar plate is stacked and pressed down after the galvanic pile polar plates are assembled in a module mode; stacking and pressing the positive current collecting plates; and stacking and pressing down the rear end plate, installing an insulating plate and a belleville spring assembly at the rear end of the electric pile polar plate, and prepressing the belleville spring assembly.
Description
Technical Field
The invention relates to the technical field of hydrogen fuel cell stack press-fitting, in particular to a high-power fuel cell stack press-fitting method and a system thereof.
Background
The electric energy generated by the fuel cell engine is provided for the whole vehicle driver through the step-up and step-down DCDC, and sufficient kinetic energy is provided for the vehicle. The consistency of the assembly of the stacks as engine core components during production and technical research needs to be strictly controlled. The stack typically contains PACK housings, end plates, current collector plates, membrane electrodes, bipolar plates, insulator plates, spring assemblies, etc. In the working process, the electric pile tightly installs hundreds of bipolar plates and membrane electrode single sheets through the internal and external binding bands or pull rods, and the electric pile shell is used as a tightly installing device. The uniformity of the distribution of the stack press-fitting force and the stacking position accuracy of each bipolar plate have a crucial influence on the initial performance and durability of the stack.
In order to improve the press-fit consistency of a large number of stacked single sheets, the prior art improves the assembly accuracy through various internal positioning rods, external positioning strips and tooling positioning pins. In the process, closed-loop verification of tool position accuracy check is not performed, and part of positioning states are in size open-loop states, so that the uniformity and performance consistency of the press-fitting of the electric pile are seriously affected, and the method is also a key problem to be solved in the development and verification industry of the press-fitting of the electric pile of the fuel cell.
In the press-mounting process of the high-power fuel cell stacks, the stacks are usually pressed for multiple times (more than 1200 sections of bipolar plates and membrane electrodes), the press-mounting is unqualified due to the problem of positioning accuracy, and secondary unstacking and stacking press-mounting are needed, so that the assembly efficiency of the stacks is seriously affected, and a large amount of labor and material cost is wasted.
Disclosure of Invention
In view of the above analysis, the embodiment of the invention aims to provide a high-power fuel cell stack press-fitting method, which is used for solving the problem that press-fitting disqualification caused by positioning precision is easy to occur in the prior art.
In one aspect, an embodiment of the present invention provides a method for press-mounting a high-power fuel cell stack, including:
s1, performing tooling material spot inspection, after determining that the sizes of parts of the galvanic pile meet stacking requirements and the transfer positions are accurate, primarily pressing the galvanic pile press-fitting tooling, and performing tooling position accuracy check;
s2, stacking and pressing the front end plates, and detecting air tightness, wherein the air tightness of the front end plates after stacking and pressing meets the set requirements;
s3, positioning the current collecting plate, paving an air, hydrogen and cooling liquid sealing ring between the end plate and the current collecting plate on the front end plate according to the positioning position, and stacking and pressing the negative current collecting plate after paving;
s4, assembling the modules of the pile electrode plates, and sequentially pressing down the stacking of the bipolar plates and the stacking of the positive current collecting plates after the assembly is completed;
s5, stacking and pressing down the rear end plates, installing an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly.
The beneficial effects of the technical scheme are as follows: the closed loop of the positioning precision of the galvanic pile press-fitting tool is realized through the steps S1-S5, and the positioning precision of the galvanic pile press-fitting tool is improved. The stacking press fitting tool is suitable for high-power high-integration electric pile, mainly solves the problems of inaccurate positioning precision and stacking positioning offset of the tool in the press fitting process, and finally realizes the press fitting of the pull-rod-free electric pile PACK, the uniformity and consistency of the press fitting meet the requirements of the electric pile on the dimension deviation, the consistency of the press fitting and stacking of the electric pile is improved, and meanwhile, the debugging process of the existing tool is improved, so that the technical problem in the current industry is fundamentally solved.
Based on a further improvement of the above method, step S1 further comprises:
s11, building a galvanic pile press fitting tool, so that each positioning block in the tool has six degrees of freedom, and more than 3 gesture adjusting reference points are arranged on each part of the internal support and positioning block of the press;
s12, determining whether the size and the appearance of the key parts of the electric pile meet the stacking requirement, executing the step S13 on the key parts meeting the stacking requirement, and screening out key parts not meeting the stacking requirement;
s13, checking tool positioning accuracy and checking points according to the gesture adjusting reference points, and determining that the rotating position of the galvanic pile assembly is accurate;
s14, performing preliminary pressing on the tool, and checking the position accuracy of the tool through laser tracking equipment;
s15, detecting the cleanliness of the installation surface of the equipment and the cleanliness of the installation surface of the product, so that all key installation surfaces meet the stacking requirement of the front end plate of the galvanic pile.
Furthermore, all the gesture adjusting reference points are arranged in space so that any two points can be collinear, but three points are not collinear at the same time, so that the space coordinate positions of all positioning blocks in the tool are uniquely determined; and, in addition, the processing unit,
step S14 further includes: installing laser tracking balls on the gesture-adjusting reference points on each part of the positioning block, acquiring all laser tracking ball coordinates through laser tracking equipment, checking and checking tool positioning accuracy, measuring whether the gesture-adjusting reference point coordinates at different positions of the positioning block are spatially offset from theoretical data, and if the gesture-adjusting reference point coordinates are spatially offset, calibrating the gesture-adjusting reference point coordinates until the gesture-adjusting reference point coordinates are spatially offset, so that tool position accuracy checking is completed.
Further, step S2 further includes:
s21, stacking and pressing the front end plate according to the diagonal locating pins and the external locating blocks on the long side of the front end plate to obtain an assembly module after the front end plate is pressed;
s22, detecting the air tightness of the assembly module after the front end plate is pressed down, and identifying whether the air tightness of the front end plate after stacking meets the set requirement; if yes, judging that the front end plate stacking and pressing function is finished, executing the step S3, otherwise, executing the next step;
s23, performing front end plate positioning alignment checking and air tightness problem checking, and executing step S22 again after correcting the checked problem parts.
Further, step S3 further includes:
s31, carrying out external positioning on the current collecting plate through the long side and the short side of the current collecting plate;
s32, paving air, hydrogen and cooling liquid sealing rings between the end plate and the current collecting plate on the negative current collecting plate according to the positioning position of the external positioning;
s33, stacking a negative current collecting plate on the assembly module with the front end plate pressed down;
s34, pressing down an assembly module formed by stacking the negative current collecting plates by using a press head of a galvanic pile press-fitting tool so as to ensure the air tightness of the negative current collecting plates and the front end plate at the fluid main pipe and the heat exchange position of the end plate;
s35, detecting whether the air tightness of the negative current collecting plate and the front end plate at the fluid main pipe and the heat exchange position of the end plate is qualified, if the air tightness is qualified, completing the stacking and pressing function of the negative current collecting plate, executing the step S4, and otherwise, performing air tightness problem fault treatment.
Further, step S4 further includes:
s41, starting a fast assembly tool mode of a pile press-fitting tool, and performing module assembly of one group of pile electrode plates 50 to obtain electrode plate modules;
s42, detecting whether the air tightness of each group of pole plate modules is qualified after the assembly is finished, if the air tightness is qualified, executing a step S43, and if the air tightness is unqualified, performing problem checking and processing on the pile pole plates in the pole plate modules;
s43, stacking the polar plate module above the assembly module with the negative electrode current collecting plate stacked and pressed in the step S3, and executing pressing operation;
s44, detecting whether the air tightness of the assembly module subjected to the pressing operation in the step S43 is qualified, if so, judging that the stacking pressing circulation function of the bipolar plate is finished, executing the step S45, and if not, checking and processing the air tightness of the electrode plate and the membrane electrode;
s45, stacking and pressing down the positive current collecting plates.
Further, step S41 further includes:
s411, stacking and press-fitting the pile electrode plates in each group by taking 50 sections as a group until the stacking and press-fitting of the last pile electrode plate are completed, and obtaining an electrode plate module;
s412, after each group of stacking is completed, the plate modules are pressed by the general press-fit force.
Further, step S5 further includes:
s51, stacking the rear end plate on an assembly module for completing the stacking and pressing cycle of the bipolar plate and the stacking and pressing of the positive current collecting plate, and executing pressing operation;
s52, installing an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly to complete the stacking and pressing function of the rear end plate and the spring assembly thereof.
Further, the method comprises the following steps:
s6, locking bolts of the assembly modules with the stacked and pressed rear end plates, and unloading the products locked by the bolts to complete the assembly task;
s7, after recognizing that the pile is compressed to reach a preset compression force, controlling a locking pressure maintaining screw or a fixed pre-tightening force bolt, releasing a press head, releasing the pile, and finishing the whole pile assembly;
s8, testing relevant basic data of the galvanic pile, and ensuring the consistency of the galvanic pile; the basic data test comprises the outer contour dimension of a pile, the overall dry insulation performance parameter of the pile and the overall pile quality;
s9, plugging each interface of the electric pile, and performing electric pile press-fitting stacking to complete the test related to the waiting performance.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. and (3) performing electric pile press-fitting tool calibration by adopting industry-initiated laser tracking equipment, and specifically, performing positioning accuracy check of the press-fitting tool. And a laser tracking positioning ball seat is arranged on each part of the positioning block, so that the theoretical space position and the actual space position of each key positioning point are highly visualized in X, Y, Z directions.
2. The step S1 in the method can be used for checking the tool debugging positioning accuracy, the open-loop dimensional accuracy can be digitally controlled, and the positioning accuracy reaches the accuracy range of one thousandth millimeter from the condition that the closed-loop cannot be realized and the stress uniformity requirement of a galvanic pile is not met in the prior art, so that the dimensional accuracy and the performance uniformity of the galvanic pile can be greatly improved, and the long-term durability problem and the performance non-uniformity problem of the galvanic pile are improved.
3. In the debugging and verification process of the rectifying tool, the debugging work is simple, the operation is portable, the visual effect is good, and the debugging work which can be completed only by a large amount of manual labor and a complicated auxiliary tool can be thoroughly simplified.
In another aspect, an embodiment of the present invention provides a high power fuel cell stack press-fitting system, including:
the tooling material spot inspection unit is used for performing tooling material spot inspection, determining that the size of the parts of the electric pile meets the stacking requirement and the rotating position is accurate, and performing tooling position accuracy check after preliminary press fit of the tooling for press fit of the electric pile;
the front end plate stacking and pressing unit is used for performing front end plate stacking and pressing and detecting air tightness, and determining that the air tightness of the front end plate after stacking and pressing meets the set requirements;
the negative electrode current collecting plate stacking and pressing unit is used for positioning the negative electrode current collecting plate, paving an end plate and an air, hydrogen and cooling liquid sealing ring between the negative electrode current collecting plates on the front end plate according to the positioning position, and performing negative electrode current collecting plate stacking and pressing after paving;
the bipolar plate stacking and pushing-down circulation unit is used for performing module assembly on the galvanic pile polar plates, and performing bipolar plate stacking and pushing-down after the assembly is completed;
the positive current collecting plate stacking and pressing unit is used for positioning the positive current collecting plate and finishing the stacking and pressing of the positive current collecting plate;
and the rear end plate stacking and pressing unit is used for stacking and pressing the rear end plate, and an insulating plate and a belleville spring assembly are arranged at the rear end of the pile electrode plate, so that a pile sealing area is supported through the prepressing belleville spring assembly.
The summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the invention, nor is it intended to be used to limit the scope of the invention.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 is a schematic diagram showing the constitution of a high-power fuel cell stack press-fitting method of example 1;
FIG. 2 shows a conventional sheet stacking flow diagram for a dual stack of example 2;
FIG. 3 shows a flow chart of the press-fitting stacking of the rear end plates of the double stack of example 2;
fig. 4 shows a flowchart of the calibration of the galvanic pile press-fitting tooling of embodiment 2;
fig. 5 shows a schematic diagram of a positioning principle of a tooling positioning block of the laser tracking measurement device in embodiment 2.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While embodiments of the present invention are illustrated in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below.
Example 1
In one embodiment of the present invention, a method for press-mounting a high-power fuel cell stack is disclosed, as shown in fig. 1, comprising the steps of:
s1, performing tooling material spot inspection, after determining that the sizes of parts of the galvanic pile meet stacking requirements and the transfer positions are accurate, primarily pressing the galvanic pile press-fitting tooling, and performing tooling position accuracy check; step S1 is used for finishing the spot inspection function of the tooling materials;
s2, stacking and pressing the front end plates, and detecting air tightness, wherein the air tightness of the front end plates after stacking and pressing meets the set requirements; step S2 is used for completing the stacking and pressing function of the front end plate;
s3, positioning the current collecting plate, paving an air, hydrogen and cooling liquid sealing ring between the end plate and the current collecting plate on the front end plate according to the positioning position, and stacking and pressing the negative current collecting plate after paving; step S3 is used for completing the stacking and pressing function of the negative current collecting plate;
s4, assembling the modules of the pile electrode plates, and sequentially pressing down the stacking of the bipolar plates and the stacking of the positive current collecting plates after the assembly is completed; step S4 is used for completing the bipolar plate stacking and pressing circulation function and the positive electrode current collecting plate stacking and pressing function;
s5, stacking and pressing down the rear end plate, mounting an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly; step S5 is for completing the stack depression function of the rear end plate and the spring assembly thereof.
In implementation, the above-mentioned pile press-fitting tool may be an existing pile press-fitting tool, see patent 202220808524.3, CN202222705714.5, etc.
Tooling position accuracy check can determine lamination uniformity through the hyposensitive paper with different compressive strengths, and for more accurate positioning check, positioning check in embodiment 2 can be used.
Compared with the prior art, the high-power fuel cell stack press-fitting method provided by the embodiment realizes the closed loop of the positioning precision of the stack press-fitting tool through the steps S1 to S5, and improves the positioning precision of the stack press-fitting tool. The stacking press fitting tool is suitable for high-power high-integration electric pile, mainly solves the problems of inaccurate positioning precision and stacking positioning offset of the tool in the press fitting process, and finally realizes the press fitting of the pull-rod-free electric pile PACK, the uniformity and consistency of the press fitting meet the requirements of the electric pile on the dimension deviation, the consistency of the press fitting and stacking of the electric pile is improved, and meanwhile, the debugging process of the existing tool is improved, so that the technical problem in the current industry is fundamentally solved.
Example 2
The improvement on the basis of the embodiment 1 is that the double galvanic piles of the high-power fuel cell are taken as an example for carrying out the press mounting of the double galvanic piles PACK, the problems of inaccurate positioning precision and stacking positioning offset in the press mounting process are mainly solved, the press mounting of the pull rod-free galvanic pile PACK is finally realized, the press mounting uniformity and consistency meet the requirement of galvanic pile size deviation, the press mounting stacking consistency of the galvanic piles is improved, the existing tool debugging process is improved, and the technical problem in the current industry is fundamentally solved.
Preferably, step S1 further comprises:
s11, building a galvanic pile press fitting tool, wherein each positioning block in the tool has six degrees of freedom (moving and rotating along a X, Y, Z axis of a built-in coordinate system of the tool), and more than 3 gesture adjusting reference points are arranged on each part of the internal support and positioning block of the press and serve as laser tracking ball coordinate points;
s12, checking a tool and a logistics point before the press mounting of the electric pile according to the press mounting process of the electric pile, determining whether the size and the appearance of key parts of the electric pile meet the stacking requirement, executing a step S13 on the key parts meeting the stacking requirement, and screening out the key parts not meeting the stacking requirement;
s13, carrying out preliminary checking and spot checking on the positioning accuracy of the tool according to the attitude adjustment datum point, and determining that the turning position of the galvanic pile assembly is accurate; specifically, the theoretical position and the actual position of the gesture adjusting reference point are obtained and compared, whether the difference value of the two positions is in a set range is judged, if the difference value is in the set range, the preliminary verification is finished, and otherwise, the position or gesture with quick positioning is adjusted.
S14, performing preliminary pressing on the tool, and checking the position accuracy of the tool through laser tracking equipment;
s15, detecting the cleanliness of the installation surface of the equipment and the cleanliness of the installation surface of the product, so that all key installation surfaces meet the stacking requirement of the front end plate of the galvanic pile.
Step S14 can also confirm the uniformity of pressing fit through the inferior sensitive paper of different compressive strengths, in order to the location check of more accuracy, can adopt the technical method of step S14 to carry out the frock position accuracy check.
In the tool calibration link (step 1) before press fitting of the electric pile, the assembly precision of the key positioning piece of the tool is checked by adopting industry-initiated empty point position coordinate detection, a mapping relation is established through a space theory digital-analog and space point position coordinate, as shown in fig. 4, the corresponding conversion relation of the space point position coordinate is realized, the equivalent coordinate origin of the 3D digital-analog and the real coordinate is realized, the position difference data is visualized in all directions through positioning points, the dynamic space pose adjustment is carried out, and finally the check of the press fitting tool positioning piece is realized.
In the pile press-fitting tool, each positioning block has six degrees of freedom in space: the basic theory of assembly of the component is that all degrees of freedom of the component are limited on theoretical positions to finish the determination of the space pose of the component, more than 3 pose adjusting reference points are required to be set on the component to further determine the pose of the component, namely coordinate points of a laser tracking ball used subsequently, and the space pose of the component is determined by measuring the coordinates of the pose adjusting reference points, namely the information of local reference positioning points of the component. For the pose adjusting point of the positioning tool part, considering the convenience of use, the pose adjusting point is generally arranged at a position point which is right in front of the press tool and can be covered by the pitching of the laser equipment.
Let the coordinate of the reference point of the component measurement be P m ，
Ρ m ＝[x m y m z m ] T (1)
The coordinates in the assembly coordinate system are P l ，P 0 Is the position of the local coordinate system relative to the assembly coordinate system,
θ, ψ are the attitude angle of the local coordinate system with respect to the assembly coordinate system, then P m And P l The method meets the following conditions:
Ρ 0 ＝[x y z] T
the above formula is further modified as follows:
the jacobian matrix above is:
wherein X is P The pose parameter vector is n, and the number of the pose adjusting reference points is n.
Three space locating points are designed on each part of the internal support and locating tool block of the press, and the space locating points are designed to be colinear at any two points, but the three points are not colinear at the same time, so that the space coordinate position information of the tool locating block is uniquely determined. And measuring whether three-point coordinates of different positions of the tool positioning block have spatial offset with theoretical data or not through laser tracking equipment, and calibrating the tool positioning block by a certain means if the three-point coordinates have the offset, so that the tool position accuracy check (the spatial positioning size check of the electric pile press-fitting tool) is realized.
Referring to fig. 5, a tool position checking process in step S1 is shown, firstly, equipment measurement is initialized, a press and a positioning tool 3D model are loaded in a measurement system, an assembly data matching relationship is determined, and a laser tracking equipment reference coordinate system is debugged to establish a spatial co-coordinate system relationship with the press tool. As shown in fig. 5, the laser tracking is used for checking the position diagram of the part, three laser tracking balls installed on the tooling part equipment are collected through the laser tracking equipment, the tooling space pose is determined, the deviation values of the current pose in the three directions of X\Y\Z all reach 0.03mm, the position of the positioning piece is locked, the position of the tooling positioning block of the press is sequentially determined, and finally the press tooling is debugged. In order to further determine the accuracy of the positioning accuracy, the laser tracking device can monitor any position of the press on line in real time to determine whether the press deviates from theoretical design data. And after all the point positions reach the design tolerance range, locking all the tool positions, and finishing the checking of the positioning strength of the tool.
Preferably, step S2 further comprises:
s21, stacking and pressing the front end plate according to the diagonal locating pins and the external locating blocks on the long side of the front end plate to obtain an assembly module after the front end plate is pressed;
s22, detecting the air tightness of the assembly module after the front end plate is pressed down, and identifying whether the air tightness of the front end plate after stacking meets the set requirement; if yes, judging that the front end plate stacking and pressing function is finished, executing the step S3, otherwise, executing the next step;
s23, performing front end plate positioning alignment checking and air tightness problem checking, and executing step S22 again after correcting the checked problem parts.
In order to determine the connection air tightness of the front end plate and the die, the electric pile press is pressed down quickly for the first time in step S21, air tightness detection is performed, and the air tightness of the stacked end plates is ensured to meet preset requirements. And if the detected data of the air tightness under the pressure is in a preset range, continuing to carry out subsequent stacking, if the air tightness is not satisfied, carrying out front end plate positioning centering checking and air tightness problem checking, and continuing to carry out front end plate stacking pressing after the problem part is processed until the air tightness is detected to be qualified, and entering the next link.
Preferably, step S3 further comprises:
s31, carrying out external positioning on the current collecting plate through the long side and the short side of the current collecting plate;
s32, paving air, hydrogen and cooling liquid sealing rings between the end plate and the current collecting plate on the negative current collecting plate according to the positioning position of the external positioning;
s33, stacking a negative current collecting plate on the assembly module with the front end plate pressed down;
s34, pressing down an assembly module formed by stacking the negative current collecting plates by using a press head of a galvanic pile press-fitting tool so as to ensure the air tightness of the negative current collecting plates and the front end plate at a fluid main pipe and the air tightness of the heat exchange part of the end plate;
s35, detecting whether the air tightness of the negative current collecting plate and the front end plate at the fluid main pipe and the heat exchange position of the end plate is qualified, if the air tightness is qualified, completing the stacking and pressing function of the negative current collecting plate, executing the step S4 (continuing to carry out subsequent stacking), otherwise, carrying out fault treatment on the air tightness problem until the air tightness is qualified, and ending the flow.
Preferably, step S4 further comprises:
s41, starting a fast assembly tool mode of a pile press-fitting tool, and performing module assembly of a group of pile electrode plates 50 to obtain electrode plate modules so as to improve pile press-fitting stacking efficiency;
s42, detecting whether the air tightness of each group of polar plate modules is qualified after assembly is finished, if so, executing a step S43 (the operation is performed as a module for assembly after the detection is qualified, the operation can greatly reduce the stacking time of the electric pile press-fitting and improve the working efficiency), and if not, performing problem investigation and treatment on the electric pile polar plates in the polar plate modules;
s43, stacking the polar plate module above the assembly module with the negative electrode current collecting plate stacked and pressed in the step S3, and executing pressing operation;
s44, detecting whether the air tightness of the assembly module subjected to the pressing operation in the step S43 is qualified, if so, judging that the stacking pressing circulation function of the bipolar plate is finished, executing the step S45, and if not, checking and processing the air tightness of the electrode plate and the membrane electrode;
s45, stacking and pressing down the positive current collecting plates. The stack pressing method is referred to in steps S31 to S35, and does not include step S32.
Preferably, step S41 employs a fast-assembled short stack 50-section bipolar plate stack pressing procedure, and the step further includes:
s411, stacking and press-fitting the pile electrode plates in each group by taking 50 sections as a group until the stacking and press-fitting of the last pile electrode plate are completed, and obtaining an electrode plate module;
s412, after each group of stacking is completed, the plate modules are pressed by the general press-fit force.
Preferably, step S5 further comprises:
s51, stacking the rear end plate on an assembly module for completing the stacking and pressing cycle of the bipolar plate and the stacking and pressing of the positive current collecting plate, and executing pressing operation;
s52, installing an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly to complete the stacking and pressing function of the rear end plate and the spring assembly thereof.
When the sealing rings between the bipolar plates cannot rebound due to permanent compression deformation, the springs form a compensation pile pressing force through prepressing, so that the air tightness of the pile is ensured, and the performance stability of the pile is ensured.
Preferably, the method further comprises the steps of:
s6, locking bolts of the assembly modules with the stacked and pressed rear end plates, and unloading the products locked by the bolts to complete the assembly task;
s7, after recognizing that the pile is compressed to reach a preset compression force, controlling a locking pressure maintaining screw or a fixed pre-tightening force bolt, releasing a press head, releasing the pile, and finishing the whole pile assembly;
s8, testing relevant basic data of the galvanic pile, and ensuring the consistency of the galvanic pile; the basic data test comprises physical information such as the outer contour dimension of the electric pile, the overall dry insulation performance parameter of the electric pile, the overall pile quality and the like;
s9, plugging each interface of the electric pile, and performing electric pile press-fitting stacking to complete the test related to the waiting performance.
Preferably, the double galvanic pile is provided with positioning edge strips.
Preferably, the tool size checking and the product size checking method are carried out through a global coordinate system.
Compared with the prior art, the high-power fuel cell stack press-fitting method provided by the embodiment has the following beneficial effects:
1. and (3) performing electric pile press-fitting tool calibration by adopting industry-initiated laser tracking equipment, and specifically, performing positioning accuracy check of the press-fitting tool. And a laser tracking positioning ball seat is arranged on each part of the positioning block, so that the theoretical space position and the actual space position of each key positioning point are highly visualized in X, Y, Z directions.
2. The step S1 in the method can be used for checking the tool debugging positioning accuracy, the open-loop dimensional accuracy can be digitally controlled, and the positioning accuracy reaches the accuracy range of one thousandth millimeter from the condition that the closed-loop cannot be realized and the stress uniformity requirement of a galvanic pile is not met in the prior art, so that the dimensional accuracy and the performance uniformity of the galvanic pile can be greatly improved, and the long-term durability problem and the performance non-uniformity problem of the galvanic pile are improved.
3. In the debugging and verification process of the rectifying tool, the debugging work is simple, the operation is portable, the visual effect is good, and the debugging work which can be completed only by a large amount of manual labor and a complicated auxiliary tool can be thoroughly simplified.
Example 3
The invention also discloses a high-power fuel cell stack press-fitting system, which uses the high-power fuel cell stack press-fitting method described in the embodiment 1 or 2, and comprises a tooling material spot inspection unit, a front end plate stacking press-fitting unit, a negative electrode current collector stacking press-fitting unit, a bipolar plate stacking press-fitting circulation unit and a rear end plate stacking press-fitting unit.
And the tooling material spot inspection unit is used for performing tooling material spot inspection, determining that the size of the parts of the electric pile accords with the stacking requirement and the rotating position of the electric pile assembly is accurate, and performing tooling position accuracy check after preliminary lamination of the electric pile press-fitting tooling.
The front end plate stacking and pressing unit is used for performing front end plate stacking and pressing and detecting air tightness, and determining that the air tightness of the front end plate after stacking and pressing meets the set requirements.
The negative electrode current collecting plate stacking and pressing unit is used for positioning the negative electrode current collecting plate, laying an end plate and an air, hydrogen and cooling liquid sealing ring between the negative electrode current collecting plates on the front end plate according to the positioning position, and performing negative electrode current collecting plate stacking and pressing after laying is completed.
And the bipolar plate stacking and pushing-down circulation unit is used for performing module assembly on the electric pile polar plates, and performing bipolar plate stacking and pushing-down after the assembly is completed.
And the positive current collecting plate stacking and pressing unit is used for positioning the positive current collecting plate and finishing the stacking and pressing of the positive current collecting plate.
And the rear end plate stacking and pressing unit is used for stacking and pressing the rear end plate, and an insulating plate and a belleville spring assembly are arranged at the rear end of the pile electrode plate, so that a pile sealing area is supported through the prepressing belleville spring assembly.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The high-power fuel cell pile press-fitting method is characterized by comprising the following steps of:
s1, performing spot inspection on tooling materials, and after the dimensions of parts of the galvanic pile are determined to meet stacking requirements and the transfer positions are accurate, primarily pressing the galvanic pile press-fitting tooling and performing tooling position accuracy check;
s2, stacking and pressing the front end plates, and detecting air tightness, wherein the air tightness of the front end plates after stacking and pressing meets the set requirements;
s3, positioning the current collecting plate, paving an air, hydrogen and cooling liquid sealing ring between the end plate and the current collecting plate on the front end plate according to the positioning position, and stacking and pressing the negative current collecting plate after paving;
s4, assembling the modules of the pile electrode plates, and sequentially pressing down the stacking of the bipolar plates and the stacking of the positive current collecting plates after the assembly is completed;
s5, stacking and pressing down the rear end plates, installing an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly.
2. The high power fuel cell stack press-fitting method according to claim 1, characterized in that step S1 further comprises:
s11, building a galvanic pile press fitting tool, so that each positioning block in the tool has six degrees of freedom, and more than 3 gesture adjusting reference points are arranged on each part of the internal support and positioning block of the press;
s12, determining whether the size and the appearance of the key parts of the electric pile meet the stacking requirement, executing a step S13 on the key parts meeting the stacking requirement, and screening out key parts not meeting the stacking requirement;
s13, carrying out preliminary checking and spot checking on the positioning accuracy of the tool according to the attitude adjustment datum point, and determining that the turning position of the galvanic pile assembly is accurate;
s14, performing preliminary pressing on the tool, and checking the position accuracy of the tool through laser tracking equipment;
s15, detecting the cleanliness of the installation surface of the equipment and the cleanliness of the installation surface of the product, so that all key installation surfaces meet the stacking requirement of the front end plate of the galvanic pile.
3. The method for press-fitting a high-power fuel cell stack according to claim 2, wherein all the attitude-adjusting reference points are arranged in space so that any two points can be collinear, but three points are not collinear at the same time, so that the space coordinate positions of all positioning blocks in the tool are uniquely determined; and, in addition, the processing unit,
step S14 further includes: a laser tracking ball is arranged on a gesture adjusting reference point on each part of the positioning block; and acquiring all laser tracking ball coordinates through laser tracking equipment to perform tool positioning accuracy check and point detection, measuring whether the gesture adjusting reference point coordinates at different positions of the positioning block have spatial offset with theoretical data, and if so, calibrating the gesture adjusting reference point coordinates until no spatial offset exists, thereby completing tool position accuracy check.
4. The high power fuel cell stack press-fitting method according to claim 3, characterized in that step S2 further comprises:
s21, stacking and pressing the front end plate according to the diagonal locating pins and the external locating blocks on the long side of the front end plate to obtain an assembly module after the front end plate is pressed;
s22, detecting the air tightness of the assembly module after the front end plate is pressed down, and identifying whether the air tightness of the front end plate after stacking meets the set requirement; if yes, judging that the front end plate stacking and pressing function is finished, executing the step S3, otherwise, executing the next step;
s23, performing front end plate positioning alignment checking and air tightness problem checking, and executing step S22 again after correcting the checked problem parts.
5. The high power fuel cell stack press-fitting method according to claim 4, wherein step S3 further comprises:
s31, carrying out external positioning of the current collecting plate through the long side and the short side of the negative current collecting plate;
s32, paving air, hydrogen and cooling liquid sealing rings between the end plate and the current collecting plate on the negative current collecting plate according to the positioning position of the external positioning;
s33, stacking a negative current collecting plate on the assembly module with the front end plate pressed down;
s34, pressing down an assembly module formed by stacking the negative current collecting plates by using a press head of a galvanic pile press-fitting tool so as to ensure the tightness of the negative current collecting plates and the front end plate at the fluid main pipe and the heat exchange position of the end plate;
s35, detecting whether the air tightness of the negative current collecting plate and the front end plate at the fluid main pipe and the heat exchange position of the end plate is qualified, if the air tightness is qualified, completing the stacking and pressing function of the negative current collecting plate, executing the step S4, and otherwise, performing air tightness problem fault treatment.
6. The high power fuel cell stack press-fitting method according to claim 5, characterized in that step S4 further comprises:
s41, starting a fast assembly tool mode of a pile press-fitting tool, and performing module assembly of one group of pile electrode plates 50 to obtain electrode plate modules;
s42, detecting whether the air tightness of each group of pole plate modules is qualified after the assembly is finished, if the air tightness is qualified, executing a step S43, and if the air tightness is unqualified, performing problem checking and processing on the pile pole plates in the pole plate modules;
s43, stacking the polar plate module above the assembly module with the negative electrode current collecting plate stacked and pressed in the step S3, and executing pressing operation;
s44, detecting whether the air tightness of the assembly module subjected to the pressing operation in the step S43 is qualified, if so, judging that the stacking pressing circulation function of the bipolar plate is finished, executing the step S45, and if not, checking and processing the air tightness of the electrode plate and the membrane electrode;
s45, stacking and pressing down the positive current collecting plates.
7. The high power fuel cell stack press-fitting method according to claim 6, wherein step S41 further comprises:
s411, stacking and press-fitting the pile electrode plates in each group by taking 50 sections as a group until the stacking and press-fitting of the last pile electrode plate are completed, and obtaining an electrode plate module;
s412, after each group of stacking is completed, the plate modules are pressed by the general press-fit force.
8. The high power fuel cell stack press-fitting method according to claim 7, characterized in that step S5 further comprises:
s51, stacking the rear end plate on an assembly module for completing the stacking and pressing cycle of the bipolar plate and the stacking and pressing of the positive current collecting plate, and executing pressing operation;
s52, installing an insulating plate and a belleville spring assembly at the rear end of the pile polar plate, and supporting a pile sealing area through prepressing the belleville spring assembly to complete the stacking and pressing function of the rear end plate and the spring assembly thereof.
9. The high-power fuel cell stack press-fitting method according to any one of claims 1 to 8, characterized by further comprising the steps of:
s6, locking bolts of the assembly modules with the stacked and pressed rear end plates, and unloading the products locked by the bolts to complete the assembly task;
s7, after recognizing that the pile is compressed to reach a preset compression force, controlling a locking pressure maintaining screw or a fixed pre-tightening force bolt, releasing a press head, releasing the pile, and finishing the whole pile assembly;
s8, testing relevant basic data of the galvanic pile, and ensuring the consistency of the galvanic pile; the basic data test comprises the outer contour dimension of a pile, the overall dry insulation performance parameter of the pile and the overall pile quality;
s9, plugging each interface of the electric pile, and performing electric pile press-fitting stacking to complete the test related to the waiting performance.
10. A high power fuel cell stack press-fitting system, comprising:
the tooling material spot inspection unit is used for performing tooling material spot inspection, determining that the size of the parts of the electric pile meets the stacking requirement and the rotating position is accurate, and performing tooling position accuracy check after preliminary press fit of the tooling for press fit of the electric pile;
the front end plate stacking and pressing unit is used for performing front end plate stacking and pressing and detecting air tightness, and determining that the air tightness of the front end plate after stacking and pressing meets the set requirements;
the negative electrode current collecting plate stacking and pressing unit is used for positioning the negative electrode current collecting plate, paving an end plate and an air, hydrogen and cooling liquid sealing ring between the negative electrode current collecting plates on the front end plate according to the positioning position, and performing negative electrode current collecting plate stacking and pressing after paving;
the bipolar plate stacking and pushing-down circulation unit is used for performing module assembly on the galvanic pile polar plates, and performing bipolar plate stacking and pushing-down after the assembly is completed;
the positive current collecting plate stacking and pressing unit is used for positioning the positive current collecting plate and finishing the stacking and pressing of the positive current collecting plate;
and the rear end plate stacking and pressing unit is used for stacking and pressing the rear end plate, and an insulating plate and a belleville spring assembly are arranged at the rear end of the pile electrode plate, so that a pile sealing area is supported through the prepressing belleville spring assembly.
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| JP2009140858A (en) * | 2007-12-10 | 2009-06-25 | Toyota Motor Corp | Manufacturing method and manufacturing facility of fuel cell stack |
| CN203607493U (en) * | 2013-12-03 | 2014-05-21 | 航天新长征电动汽车技术有限公司 | Fuel cell stack packaging structure |
| CN108923057A (en) * | 2018-06-07 | 2018-11-30 | 广东国鸿氢能科技有限公司 | A kind of pre-assembled method of fuel cell pile |
| CN115347223A (en) * | 2022-08-19 | 2022-11-15 | 东方电气(成都)氢燃料电池科技有限公司 | Compensation mechanism, stacked battery packaging structure and full-working-condition packaging force control method |
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| JP2009140858A (en) * | 2007-12-10 | 2009-06-25 | Toyota Motor Corp | Manufacturing method and manufacturing facility of fuel cell stack |
| CN203607493U (en) * | 2013-12-03 | 2014-05-21 | 航天新长征电动汽车技术有限公司 | Fuel cell stack packaging structure |
| CN108923057A (en) * | 2018-06-07 | 2018-11-30 | 广东国鸿氢能科技有限公司 | A kind of pre-assembled method of fuel cell pile |
| CN115347223A (en) * | 2022-08-19 | 2022-11-15 | 东方电气(成都)氢燃料电池科技有限公司 | Compensation mechanism, stacked battery packaging structure and full-working-condition packaging force control method |
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