Assembly tool for hydrogen fuel cell stack

Abstract

The invention discloses a hydrogen fuel cell stack assembly tool which is characterized in that the assembly tool comprises a bottom plate (1), the two ends of the bottom plate (1) are each provided with a pair of sliding rails (2) distributed in the length direction of the bottom plate (1), sliding tables (3) are connected to the sliding rails (2) in a sliding mode, and calibration press-fitting mechanisms are arranged on the two sliding tables (3); the two calibration press-fitting mechanisms are symmetrically distributed, a positioning pin (4) is arranged on the sliding table (3), a positioning seat (5) is arranged on the bottom plate (1), a positioning hole matched with the positioning pin (4) is formed in the positioning seat (5), a limiting piece (6) is further arranged at the end of the bottom plate (1), the limiting piece (6) is matched with the outer end face of the sliding table (3), and a handle (7) is further arranged on the sliding table (3).

Description

Technical Field

[0001] The present invention relates to the field of tooling, and in particular to a hydrogen fuel cell stack assembly tooling. Background Art

[0002] Hydrogen fuel cells are an efficient and clean energy conversion technology that has been widely used in transportation, aerospace, mobile power and other fields. A hydrogen fuel cell stack is a device that generates electricity by reacting hydrogen and oxygen. It is the core component of a hydrogen fuel cell. It consists of end plates, insulating plates, current collectors, bipolar plates and MEA, which are assembled together by compression force.

[0003] When assembling a hydrogen fuel cell stack, the components are combined in a certain order and manner to form a whole. Then a certain amount of compression is applied to the assembled components to form close contact between the components. During assembly, the components are required to be stacked neatly, in close contact, and evenly stressed on each force-bearing surface to achieve good gas, liquid, and electronic transmission environment conditions, thereby ensuring the stable operation of the stack. Since the assembly quality of the stack directly affects the performance and life of the fuel cell, the accuracy of the stack assembly process is very important for the fuel cell.

[0004] The long pin limiting method is used in the existing battery stack assembly process. The limiting pin holes of each component of the battery stack are accurately processed according to the design assembly requirements. When assembling the battery stack, they are limited by a long pin to ensure that the parts are stacked neatly, and then pressed by a pressure device. This method has high requirements on the processing accuracy of the limiting pin holes of each component of the battery stack, the material and processing accuracy of the long pin. The high processing accuracy makes the processing difficult and the cost is also high.

[0005] With the rapid development of hydrogen energy, the market's power requirements for hydrogen fuel cells are increasing. Therefore, more parts are needed to assemble the stack, and the axial size of the stack is getting larger and larger. The matching long pin is too long, the reliability of the limit is reduced, and the assembly operation is becoming more and more inconvenient. The trial test found that the long pin is too long and there is a risk of damaging the bipolar plate and MEA. The assembly quality and production efficiency of the long pin limit method can no longer meet the quality requirements and market development needs.

[0006] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0007] The present invention aims to solve the above-mentioned deficiencies in the prior art and proposes a hydrogen fuel cell stack assembly tool which has a simple structure, ingenious design, reasonable layout, and can quickly, conveniently and accurately achieve axial positioning of various components in the stack, thereby ensuring the assembly quality of the stack.

[0008] The technical solution of the present invention is: a hydrogen fuel cell stack assembly tool, characterized in that: the assembly tool comprises a bottom plate 1, and a pair of slide rails 2 distributed along the length direction of the bottom plate 1 are respectively provided at both ends of the bottom plate 1, and a slide table 3 is slidably connected to the slide rail 2, and a calibration press mechanism is provided on both slide tables 3, and the two calibration press mechanisms are symmetrically distributed. The slide 3 is provided with a positioning pin 4, the bottom plate 1 is provided with a positioning seat 5, the positioning seat 5 is provided with a positioning hole matched with the positioning pin 4, and a limiting member 6 is also provided at the end of the bottom plate 1, the limiting member 6 matches the outer end surface of the slide 3, and a handle 7 is also provided on the slide 3. The calibration press-fitting mechanism comprises a vertical plate 8 fixedly connected to the slide 3, a longitudinal slider 9 fixedly arranged on the back side of the vertical plate 8, the longitudinal slider 9 is slidably connected to the longitudinal slide rail 10, the top of the longitudinal slide rail 10 is fixedly connected to the movable pressing plate 11, the bottom of the movable pressing plate 11 is connected to two symmetrically distributed guide bars 12, and the guide bars 12 are movably connected in the guide groove 13 opened on the front side of the vertical plate 8. A connecting block 14 is arranged on the back side of the vertical plate 8, a guide column 15 is fixedly connected to the connecting block 14, a spring 16 is connected to the outer sleeve of the guide column 15, a guide block 17 is arranged on the back side of the movable pressing plate 11 and is located directly above the connecting block 14, the guide column 15 is movably connected to the guide hole provided on the guide block 17, a limiting nut 18 located above the guide block 17 is connected to the top end of the guide column 15, and the spring 16 is located between the connecting block 14 and the guide block 17, a shell 19 is also arranged on the movable pressing plate 11, and the connecting block 14, the guide column 15, the spring 16, the guide block 17 and the limiting nut 18 are all located in the shell 19, Limiting edges 20 are provided at two side edges of the inner side surfaces of the vertical plate 18 and the movable pressing plate 11 .

[0009] Compared with the prior art, the present invention has the following advantages: This type of hydrogen fuel cell stack assembly tooling has a simple structure, ingenious design, and reasonable layout. It is designed to address the problems existing in the traditional stack assembly process. It uses two symmetrically distributed slides to drive two calibration plates to move toward each other, and uses the limiting edges set on the sides of the two calibration plates to calibrate the spatial accuracy of each component in the stack. Compared with the traditional long pin positioning method, this tooling can accurately limit and adjust the stack with large axial dimensions, thereby achieving accurate assembly of large-sized stacks. In addition, its manufacturing process is simple and its manufacturing cost is low. Therefore, it can be said that it has many advantages and is particularly suitable for promotion and application in this field. Its market prospects are very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention (with a workpiece).

[0011] Figure 2 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention (without workpiece).

[0012] Figure 3 It is a partial enlarged view of the slide portion in the embodiment of the present invention.

[0013] Figure 4 It is a partial enlarged view of the movable pressing plate part in the embodiment of the present invention. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention will be described below with reference to the accompanying drawings. Figures 1 to 4 As shown: a hydrogen fuel cell stack assembly tool, which includes a base plate 1 as a basis, a pair of slide rails 2 distributed along the length direction of the base plate 1 are respectively arranged at both ends of the base plate 1, a slide table 3 is slidably connected to the slide rail 2, and a calibration press mechanism is arranged on both slide tables 3, and the two calibration press mechanisms are symmetrically distributed. The slide 3 is provided with a positioning pin 4, the bottom plate 1 is provided with a positioning seat 5, the positioning seat 5 is provided with a positioning hole matched with the positioning pin 4, and a limiting member 6 is also provided at the end of the bottom plate 1, the limiting member 6 matches the outer end surface of the slide 3, and a handle 7 is also provided on the slide 3. The calibration press-fitting mechanism comprises a vertical plate 8 fixedly connected to the slide 3, a longitudinal slider 9 fixedly arranged on the back side of the vertical plate 8, the longitudinal slider 9 is slidably connected to the longitudinal slide rail 10, the top of the longitudinal slide rail 10 is fixedly connected to the movable pressing plate 11, the bottom of the movable pressing plate 11 is connected to two symmetrically distributed guide bars 12, and the guide bars 12 are movably connected in the guide groove 13 opened on the front side of the vertical plate 8. A connecting block 14 is arranged on the back side of the vertical plate 8, a guide column 15 is fixedly connected to the connecting block 14, a spring 16 is connected to the outer sleeve of the guide column 15, a guide block 17 is arranged on the back side of the movable pressing plate 11 and is located directly above the connecting block 14, the guide column 15 is movably connected to the guide hole provided on the guide block 17, a limiting nut 18 located above the guide block 17 is connected to the top end of the guide column 15, and the spring 16 is located between the connecting block 14 and the guide block 17, a shell 19 is also arranged on the movable pressing plate 11, and the connecting block 14, the guide column 15, the spring 16, the guide block 17 and the limiting nut 18 are all located in the shell 19, Limiting edges 20 are provided at two side edges of the inner side surfaces of the vertical plate 18 and the movable pressing plate 11 .

[0015] The working process of the hydrogen fuel cell stack assembly tool of the embodiment of the present invention is as follows: first, the components of the stack to be assembled are placed on the bottom plate 1 between the two slides 3. After all the components are neatly arranged, the handles 7 on the two slides 3 are respectively held to push the slides 3 to move toward the direction of the stack. The slides 3 drive the calibration press-fitting mechanism thereon to move. In the calibration press-fitting mechanism, the inner side surface of the vertical plate 8 contacts the ends of multiple components of the stack to ensure that the end surfaces of all components are in a coplanar state, that is, their positions are corrected in the X-axis direction; and the limiting edges 20 arranged on both sides of the inner side surface of the vertical plate 8 will correct their positions in the Y-axis direction. After the slide 3 moves into place, the positioning pin 4 is inserted into the positioning hole opened on the positioning seat 5, the two slides 3 are fixed, and the two sets of calibration press-fitting mechanisms clamp the multiple components of the stack (they have not been pressed at this time) from both sides, and ensure that their relative position accuracy meets the pressing requirements; Then the press located above the tooling works, the ram of the press moves downward, the middle of the ram directly contacts the workpiece on the uppermost layer, and the two ends of the ram contact the top surfaces of the movable pressing plates 11 in the two calibration pressing mechanisms at the same time; Under the pressure of the pressure head, the stacked components are pressed into an integrated structure. When the pressure head moves, the movable pressing plate 11 also moves downward relative to the vertical plate 8. During this process, the spring 16 is compressed, the guide column 15 slides in the guide hole, and the guide bar 12 slides in the guide groove 13, which plays a guiding role, so that the movement of the movable pressing plate 11 is smoother and more stable. After the pressing process is completed, the pressing head moves upward and leaves the movable pressing plate 11. At this time, the movable pressing plate 11 moves upward again under the action of the spring 16 and returns to the initial position; Pull out the positioning pin 4, pull the handle 7 in the opposite direction, let the two slides 3 move toward the end of the base plate 1, and use the lifting tool to remove the assembled stack from the base plate 1, thus completing the assembly of the hydrogen fuel cell stack.

Claims

1. A hydrogen fuel cell stack assembly tool, characterized in that: The assembly tool comprises a base plate (1), and a pair of slide rails (2) are respectively arranged at both ends of the base plate (1) and are distributed along the length direction thereof. A slide table (3) is slidably connected to the slide rails (2), and a calibration press-fitting mechanism is arranged on both slide tables (3), and the two calibration press-fitting mechanisms are symmetrically distributed. The slide (3) is provided with a positioning pin (4), the bottom plate (1) is provided with a positioning seat (5), the positioning seat (5) is provided with a positioning hole matching the positioning pin (4), a limiting member (6) is provided at the end of the bottom plate (1), the limiting member (6) matches the outer end surface of the slide (3), and a handle (7) is provided on the slide (3). The calibration pressing mechanism comprises a vertical plate (8) fixedly connected to the slide table (3), a longitudinal slide block (9) fixedly arranged on the back side of the vertical plate (8), the longitudinal slide block (9) being slidably connected to the longitudinal slide rail (10), the top of the longitudinal slide rail (10) being fixedly connected to a movable pressing plate (11), the bottom of the movable pressing plate (11) being connected to two symmetrically distributed guide bars (12), the guide bars (12) being movably connected to a guide groove (13) opened on the front side of the vertical plate (8), A connecting block (14) is arranged on the back side of the vertical plate (8), a guide column (15) is fixedly connected to the connecting block (14), a spring (16) is connected to the outer shell of the guide column (15), a guide block (17) is arranged on the back side of the movable pressure plate (11) and is located directly above the connecting block (14), the guide column (15) is movably connected to a guide hole provided on the guide block (17), a limiting nut (18) located above the guide block (17) is connected to the top end of the guide column (15), and the spring (16) is located between the connecting block (14) and the guide block (17), a shell (19) is also arranged on the movable pressure plate (11), and the connecting block (14), the guide column (15), the spring (16), the guide block (17) and the limiting nut (18) are all located in the shell (19), Limiting edges (20) are provided at two side edges of the inner side surfaces of the vertical plate (18) and the movable pressing plate (11).

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