Infiltration cleaning tool for graphite bipolar plate

Abstract

The invention discloses an infiltration cleaning tool for a graphite bipolar plate. The retainer comprises an outer frame and a retainer, the outer frame at least comprises a left side wall, a right side wall, a bottom wall and a rear wall which define a containing cavity, and the left side wall, the right side wall, the bottom wall and the rear wall all comprise hollowed-out structures so that liquid can flow into the containing cavity. The retainer comprises a plurality of spacers made of hydrophobic plastic materials, and the spacers are arranged in the containing cavity side by side in the left-right direction to define a plurality of insert grooves. The inlet and outlet areas of the graphite bipolar plate are positioned at the upper end and the lower end of the graphite bipolar plate, and the flow field reaction area is positioned between the two inlet and outlet areas. The spacer is provided with a reinforcing strip group corresponding to the inlet and outlet area and is provided with a flow guide strip corresponding to the flow field reaction area. The flow guide strip comprises a plurality of inclined sections so as to disturb and guide liquid between the flow field reaction areas of the two adjacent graphite bipolar plates to flow. And the distance between the middle flow field reaction regions of the two adjacent graphite bipolar plates, which is limited by the spacer, is not less than 2mm.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and particularly to an impregnation cleaning tool for graphite bipolar plates. Background Art

[0002] As a core component of fuel cells, graphite bipolar plates have advantages such as excellent electrical conductivity, light component weight, and low cost compared to bipolar plates made of other materials. In the manufacturing process of graphite bipolar plates, the impregnation process is one of the extremely important process steps. The quality of the impregnation process directly determines the performance of the bipolar plates, such as strength, sealing performance, and electrical conductivity.

[0003] The impregnation process is to immerse the molded graphite bipolar plate into a specific resin solution, so that the resin material enters the layer gaps of the graphite layer of the bipolar plate. After impregnation, the impregnated graphite bipolar plate needs to be cleaned and cured in a water bath. Throughout the manufacturing process, the molded graphite bipolar plate is placed on the fixture and will not be taken out of the fixture until the graphite bipolar plate is cured. However, due to the extremely low surface energy of the resin, it is easy to adhere to the gap between the tooling and the bipolar plate, resulting in difficult cleaning and increased cleaning costs. Especially when the distance between adjacent bipolar plates is small, it makes the liquid flow difficult between adjacent bipolar plates, especially between large-area regions such as the flow field reaction area and distribution area of adjacent bipolar plates, seriously affecting the cleaning effect of these regions.

[0004] Based on this, it is necessary to propose a technical solution to overcome the deficiencies of the prior art. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention proposes an impregnation cleaning tool for graphite bipolar plates to improve the cleaning effect.

[0006] The present invention is realized through the following technical solutions: An impregnation and cleaning tooling for graphite bipolar plates, comprising an outer frame and a holding frame disposed in the outer frame. The outer frame at least includes left and right side walls, a bottom wall, and a rear wall. The left and right side walls, the bottom wall, and the rear wall enclose an accommodation cavity. The left and right side walls, the bottom wall, and the rear wall of the outer frame all include a hollow structure to allow liquid to flow into the accommodation cavity in the front-back, left-right, and up-down directions. The holding frame includes a plurality of partitions made of hydrophobic plastic material. The plurality of partitions are arranged side by side in the left-right direction in the accommodation cavity to define the accommodation cavity into several insertion slots for the graphite bipolar plates to be placed side by side and spaced apart in the left-right direction. The graphite bipolar plates are adapted to be loaded into the insertion slots from front to back and are arranged vertically, so that the inlet and outlet areas of each graphite bipolar plate where the medium inlet and outlet are provided are located at the upper and lower ends, and the flow field reaction area is located between the two inlet and outlet areas. Wherein, the partition is provided with a reinforcing strip group composed of several reinforcing strips corresponding to the inlet and outlet areas. The reinforcing strip group is used to contact the graphite bipolar plate to keep it in a vertical state. The partition is provided with a diversion strip corresponding to the flow field reaction area. The diversion strip includes a plurality of inclined segments that extend obliquely in the up-down direction to disturb and guide the liquid flow between the middle flow field reaction areas of two adjacent graphite bipolar plates, and the distance between the middle flow field reaction areas of two adjacent graphite bipolar plates defined by the partition is not less than 2 mm.

[0007] As a further improved technical solution, the partition includes a rectangular contour frame. The diversion strip is located within the contour frame and extends in a wavy shape in the up-down direction.

[0008] As a further improved technical solution, the peak points and valley points of the wavy-shaped diversion strip are respectively connected to two sides in the width direction of the contour frame.

[0009] As a further improved technical solution, the reinforcing strip group is arranged at both ends in the length direction of the contour frame. The several reinforcing strips included in the reinforcing strip group are respectively connected to two sides in the width direction of the contour frame.

[0010] As a further improved technical solution, the contour frame, the diversion strip, and the reinforcing strips are all composed of cylindrical plastic strips with a diameter between 2.5 and 4.5 mm.

[0011] As a further improved technical solution, the partition is a PTFE or PFA injection molded part.

[0012] As a further improved technical solution, the holding frame includes several cushion blocks. The cushion blocks are arranged at both ends in the up-down direction of the partition and are located between two adjacent partitions to support and form the insertion slots between two adjacent partitions, and the width of the insertion slots is not greater than 3 mm.

[0013] As a further improved technical solution, the spacer block is detachably connected to the spacer sheet. The spacer block includes at least two types with different heights, and the two types of spacer blocks are replaceably assembled on the spacer sheet; alternatively, a plurality of spacer blocks are fixedly connected to each spacer sheet, and the spacer sheet includes at least two types with different height spacer blocks fixed thereon, and the two types of spacer sheets are replaceably assembled in the accommodation cavity.

[0014] As a further improved technical solution, the outer frame includes a strip-shaped baffle disposed on its front side, and both ends of the strip-shaped baffle are detachably connected to the left and right side walls.

[0015] As a further improved technical solution, a lifting member is provided at the upper ends of the left and right side walls for facilitating the lifting and taking of the impregnation cleaning tooling.

[0016] The impregnation cleaning tooling for graphite bipolar plates provided by the present invention, on the one hand, uses a spacer sheet made of a hydrophobic plastic material, so that it has hydrophobic properties, reduces the adhesion of the impregnation resin between the impregnation cleaning tooling and the graphite bipolar plates, and reduces the cleaning difficulty; on the other hand, a diversion strip is provided on the spacer sheet corresponding to the flow field reaction area of the graphite bipolar plates. The diversion strip includes a plurality of inclined segments that extend obliquely in the up and down directions to disturb and guide the liquid flow between the middle flow field reaction areas of two adjacent graphite bipolar plates, and the distance between the middle flow field reaction areas of two adjacent graphite bipolar plates defined by the spacer sheet is not less than 2 mm. Such a setting improves the flow flushing ability of the cleaning liquid between two adjacent graphite bipolar plates, especially between the middle flow field reaction areas of two adjacent graphite bipolar plates, and improves the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional combined view of an embodiment of the impregnation cleaning tooling of the present invention.

[0018] Figure 2 is another three-dimensional combined view of an embodiment of the impregnation cleaning tooling of the present invention.

[0019] Figure 3 is a three-dimensional combined view of an embodiment of the impregnation cleaning tooling of the present invention assembled with graphite bipolar plates.

[0020] Figure 4 is a three-dimensional exploded view of an embodiment of the impregnation cleaning tooling of the present invention.

[0021] Figure 5 is a three-dimensional view of the spacer sheet in an embodiment of the impregnation cleaning tooling of the present invention.

[0022] Figure 6 is a three-dimensional view of the graphite bipolar plate that can be assembled with the impregnation cleaning tooling of the present invention.

[0023] Figure 7It is a schematic structural diagram of the cooperation between the spacer and the graphite bipolar plate in the impregnation cleaning tooling of the present invention.

[0024] Explanation of the reference numerals in the attached drawings: 100 - impregnation cleaning tooling; 11 - left and right side walls; 111 - clamping opening; 12 - bottom wall; 13 - rear wall; 14 - strip-shaped baffle; 141 - bent hook portion; 15 - rear baffle; 16 - lifting member; 2 - spacer; 21 - contour frame; 22 - reinforcing strip group; 23 - diversion strip; 201 - insertion slot; 3 - spacer block; 5 - graphite bipolar plate; 51 - inlet and outlet area; 510 - medium inlet and outlet; 52 - flow field reaction area; 53 - distribution area. Detailed implementation manners

[0025] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the attached drawings.

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] The present invention provides an impregnation cleaning tooling 100 for a graphite bipolar plate 5. The impregnation cleaning tooling 100 is used to carry the graphite bipolar plate 5 during the impregnation process and the cleaning process after impregnation, and immerse it in the impregnation liquid or the cleaning liquid.

[0028] The impregnation cleaning tooling 100 includes an outer frame and a holding frame provided in the outer frame. The outer frame at least includes left and right side walls 11, a bottom wall 12, and a rear wall 13. The left and right side walls 11, the bottom wall 12, and the rear wall 13 enclose a receiving cavity. The left and right side walls 11, the bottom wall 12, and the rear wall 13 of the outer frame all include a hollow structure to allow liquid to flow into the receiving cavity in the front-back, left-right, and up-down directions. The holding frame includes a plurality of spacers 2 made of hydrophobic plastic material. The plurality of spacers 2 are arranged side by side in the left-right direction in the receiving cavity to define the receiving cavity into a plurality of insertion slots 201 for the graphite bipolar plates 5 to be placed side by side at intervals in the left-right direction. The graphite bipolar plate 5 is adapted to be inserted into the insertion slot 201 from front to back and is arranged vertically, so that the inlet and outlet area 51 of each graphite bipolar plate 5 where the medium inlet and outlet 510 is provided is located at the upper end and the lower end, and the flow field reaction area 52 is located between the two inlet and outlet areas 51.

[0029] The spacer 2 is provided with a reinforcing strip group 22 composed of a plurality of reinforcing strips corresponding to the inlet and outlet area 51. The reinforcing strip group 22 is used to contact the graphite bipolar plate 5 to keep it in an upright state. The spacer 2 is provided with a flow guiding strip 23 corresponding to the flow field reaction area 52. The flow guiding strip 23 includes a plurality of inclined segments that extend obliquely in the vertical direction to disturb and guide the liquid flow between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5. And the distance between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5 defined by the spacer 2 is not less than 2 mm.

[0030] The impregnation cleaning tooling 100 for the graphite bipolar plate 5 provided by the present invention, on the one hand, uses a spacer 2 made of a hydrophobic plastic material, so that it has hydrophobic properties, reduces the adhesion of the impregnation resin between the impregnation cleaning tooling and the graphite bipolar plate 5, and reduces the cleaning difficulty. On the other hand, the spacer 2 is provided with a flow guiding strip 23 corresponding to the flow field reaction area 52 of the graphite bipolar plate 5. The flow guiding strip 23 includes a plurality of inclined segments that extend obliquely in the vertical direction; with such a setting, the flow guiding strip 23 with hydrophobic properties itself can effectively break the surface tension of the liquid between the narrow adjacent graphite bipolar plates 5, play a flow disturbing effect and guide the liquid flow, so as to improve the flow and flushing ability of liquids such as impregnation liquid and cleaning liquid between two adjacent graphite bipolar plates 5, especially between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5, and improve the impregnation and cleaning effects.

[0031] Please refer to Figures 1 to 4As shown, in this embodiment, the outer frame includes left and right side walls 11, a bottom wall 12, and a rear wall 13. The left and right side walls 11, the bottom wall 12, and the rear wall 13 enclose a receiving cavity. Further, the outer frame may also include a top wall and a front wall. In this embodiment, the outer frame includes a strip-shaped baffle 14 disposed on its front side, and the strip-shaped baffle 14 constitutes the front wall. The two ends of the strip-shaped baffle 14 are detachably connected to the left and right side walls 11, so as to facilitate the graphite bipolar plate 5 and the separator 2 to be placed into the outer frame from the front side of the outer frame and taken out from the outer frame. In this embodiment, the two ends of the strip-shaped baffle 14 are provided with folded hook portions 141, and the left and right side walls 11 are provided with clamping openings 111. The bent portions 141 can be placed in the clamping openings 111 along the front-rear direction, and then the strip-shaped baffle 14 is moved upward or downward, and it can be clamped at the front edge of the left and right side walls 11, which can prevent the graphite bipolar plate 5 from sliding out from the front side of the outer frame during the impregnation or cleaning process. Further, in this embodiment, a rear baffle 15 is also provided at the rear wall 13. The rear baffle 15 has the same structure as the strip-shaped baffle 14, and its two ends are detachably connected to the rear edge of the left and right side walls 11. The left and right side walls 11, the bottom wall 12, the rear wall 13, the top wall and the front wall of the outer frame, as well as the separator 2 all include a hollow structure to allow liquid to flow into the receiving cavity in the front-rear, left-right, and up-down directions. The upper ends of the left and right side walls 11 are provided with lifting members 16 for facilitating the lifting and placing of the impregnation cleaning tooling 100, so as to facilitate manual or hanging machine to lift the impregnation cleaning tooling 100. The above-mentioned front-rear direction, left-right direction, and up-down direction are as indicated by the arrows in the accompanying drawings, and they are relative orientations described with the side where the operator usually takes and places the graphite bipolar plate 5 as the front.

[0032] Please refer particularly to Figure 4 and Figure 5As shown, the cage is composed of a plurality of spacers 2 arranged at equal intervals. The spacers 2 are injection-molded using PTFE (polytetrafluoroethylene) or PFA (perfluoroalkoxy resin), and have excellent hydrophobicity and chemical stability. In this embodiment, each spacer 2 includes a rectangular contour frame 21, a reinforcing bar group 22 located within the contour frame 21, and a diversion bar 23. In this embodiment, the reinforcing bar group 22 is provided at both ends of the contour frame 21 in the length direction, which is also the up-and-down direction in this embodiment. The reinforcing bar group 22 includes a plurality of reinforcing bars, and the plurality of reinforcing bars are respectively connected to two sides of the contour frame 21 in the width direction. The diversion bar 23 is located within the contour frame 21 and extends in a wavy shape in the up-and-down direction. The peak points and valley points of the wavy extension of the diversion bar 23 are respectively connected to two sides of the contour frame 21 in the width direction to improve the connection strength and enhance the overall structural strength of the spacer 2. The cage includes a plurality of cushion blocks 3, and the cushion blocks 3 are provided at both ends of the spacer 2 in the up-and-down direction and are located between adjacent spacers 2 to support and form an insertion slot 201 for inserting and holding the graphite bipolar plate 5 between adjacent spacers 2.

[0033] Please refer to Figure 6 and Figure 7 As shown, in this embodiment, the width d of the insertion slot 201 defined by the cushion block 3 is not greater than 3 mm. In some embodiments, the thickness of the graphite bipolar plate 5 is about 1 mm. If the above width d is too large, on the one hand, the number of graphite bipolar plates 5 that can be accommodated in the impregnation and cleaning tooling 100 with the same volume will decrease, resulting in a decrease in the impregnation and cleaning efficiency; on the other hand, it will also increase the shaking space of the graphite bipolar plate 5 placed in the insertion slot 201 and the inclination angle of the graphite bipolar plate 5, affecting the impregnation and cleaning effect. If the above width d is too small, for example, basically equivalent to the thickness of the graphite bipolar plate 5, on the one hand, it will make it difficult to load the graphite bipolar plate 5, and on the other hand, it will cause each part of the spacer 2 to contact the graphite bipolar plate 5, resulting in an increase in the area of the graphite bipolar plate 5 covered by the spacer 2 and affecting the impregnation and cleaning effect. Preferably, for the graphite bipolar plate 5 with a thickness of about 1 ± 0.2 mm, the width d of the insertion slot 201 is 1.5 - 2.5 mm.

[0034] Of course, in other embodiments, the width of the insertion slot 201 varies according to the graphite bipolar plates 5 of different thicknesses. In some embodiments, the spacer block 3 is detachably connected to the spacer 2. The spacer block 3 includes at least two types with different heights, and the two types of spacer blocks 3 are replaceably assembled on the spacer 2. In other embodiments, a plurality of spacer blocks 3 are fixedly connected to each spacer 2, and the spacer 2 includes at least two types with different height spacer blocks 3 fixedly connected thereto, and the two types of spacers 2 are replaceably assembled in the accommodation cavity. With such an arrangement, the size of the insertion slot 201 is adjustable to meet graphite bipolar plates 5 of different sizes or the clamping requirements with different clamping degrees in different scenarios.

[0035] In some embodiments, since the size of the insertion slot 201 is larger than the thickness of the graphite bipolar plate 5, when the graphite bipolar plate 5 is placed in the insertion slot 201, it will be in a slightly inclined and upright state. In other words, the upright state described in the present invention means that the graphite bipolar plates 5 are arranged in a vertical arrangement in the impregnation and cleaning tooling, and it does not mean that it should be absolutely perpendicular to the horizontal plane. A certain inclination is allowed. Since the graphite bipolar plate 5 is inclined in the insertion slot 201, the inlet and outlet areas 51 at the upper and lower ends of the graphite bipolar plate 5 will contact the spacer 2. To ensure the strength of the spacer 2 and provide better support performance, the spacer 2 is provided with a reinforcing strip group 22 corresponding to the inlet and outlet areas 51 of the graphite bipolar plate 5. In this embodiment, the reinforcing strip group 22 includes a plurality of laterally extending reinforcing strips. Although the arrangement of the reinforcing strip group 22 will reduce the hollow area at this location, since the reinforcing strip group 22 corresponds exactly to the inlet and outlet areas 51 of the graphite bipolar plate 5, which are provided with medium inlets and outlets 510 for oxygen, hydrogen, and water to enter and exit, the liquid can flow fully here. Therefore, the reduction of the hollow area here will not have an adverse effect on the liquid flow here.

[0036] Please refer to Figure 6As shown, in this embodiment, the flow guide strip 23 is correspondingly located outside the flow field reaction area 52 of the graphite bipolar plate 5. In other embodiments, it can further extend to the distribution area 53 of the graphite bipolar plate 5. For the narrow space formed between the flow field reaction areas 52 of two adjacent graphite bipolar plates 5, in the prior art, in order to relieve the poor liquid circulation at this place, the usual way is to try to increase the hollow area of the infiltration cleaning tooling here. For example, the spacer 2 is completely hollowed out here, or in order to take into account the supporting performance at the same time, several cross bars are extremely sparsely arranged. However, although completely hollowing out seemingly reduces the flow resistance, since the liquid here can only flow laminarly along the surface layer of the flow field reaction area 52, at this time, the liquid will form a water film due to the surface tension of the liquid in a narrow space with a relatively large surface area, resulting in poor fluidity. The present invention provides a flow guide strip 23 corresponding to this area. The flow guide strip 23 includes a plurality of inclined sections that extend obliquely in the up and down directions. On the one hand, it can play a role in disturbing the flow, so that the flow state of the liquid in the narrow space formed between the flow field reaction areas 52 of two adjacent graphite bipolar plates 5 is no longer a single state, but a disturbed and transformed state, which helps to break the surface tension of the liquid between the narrow adjacent graphite bipolar plates 5 and promote its flow; on the other hand, the plurality of inclined sections that extend obliquely can guide the liquid to flow obliquely to improve the flushing ability and flushing uniformity. In addition, since the flow guide strip 23 itself is made of fluoroplastics with hydrophobic properties, it further promotes the flow of the liquid on it and enhances the flow guiding effect. In this embodiment, the flow guide strip 23 is wavy in the up and down directions and can guide the liquid flow to be wavy. At the same time, this corrugated structure can also prevent local warping and deformation of the graphite bipolar plate 5 during the curing process.

[0037] In this embodiment, the distance D between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5 defined by the spacer 2 is not less than 2 mm. In other words, the thickness of the spacer 2 is not less than 2 mm. In this embodiment, the spacer 2 is entirely composed of a cylindrical plastic strip, that is, the diameter of the cylindrical plastic strip is not less than 2 mm. Specifically, in this embodiment, the contour frame 21, the flow guide strip 23 and the reinforcing strip are all composed of cylindrical plastic strips with a diameter between 2.5 and 4.5 mm. Preferably, they are composed of cylindrical fluoroplastic strips with a diameter of 3 mm or 3.5 mm or 4 mm. Using a cylindrical shape, its actual contact surface with the graphite bipolar plate 5 is linear, the contact area is small, and the flow disturbing and water guiding effects are better than those of columns with planes such as square columns.

[0038] As can be seen from the above description, for the impregnation cleaning tooling 100 for the graphite bipolar plate 5 provided by the present invention, on the one hand, the spacer 2 made of hydrophobic plastic material is adopted, so that it has hydrophobic properties, reduces the adhesion of the impregnation resin between the impregnation cleaning tooling and the graphite bipolar plate 5, and reduces the cleaning difficulty; on the other hand, a guiding strip 23 is arranged on the spacer 2 corresponding to the flow field reaction area 52 of the graphite bipolar plate 5. The guiding strip 23 includes multiple inclined segments that extend obliquely in the up and down directions to disturb and guide the liquid flow between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5, and the distance between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5 defined by the spacer 2 is not less than 2 mm. Such a setting improves the flowing and flushing ability of the cleaning liquid between two adjacent graphite bipolar plates 5, especially between the middle flow field reaction areas 52 of two adjacent graphite bipolar plates 5, and improves the cleaning effect.

[0039] The present invention is illustrated by several specific embodiments. Those skilled in the art should understand that various transformations and equivalent substitutions can be made to the present invention without departing from the scope of the present invention. In addition, various modifications can be made to the present invention for a specific situation or circumstance without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims of the present invention.

Claims

1. An impregnation cleaning tool for graphite bipolar plates, comprising an outer frame and a retainer arranged in the outer frame, wherein the outer frame comprises at least left and right side walls, a bottom wall and a rear wall, wherein the left and right side walls, the bottom wall and the rear wall surround a receiving cavity, and the left and right side walls, the bottom wall and the rear wall of the outer frame all comprise a hollow structure to allow liquid to flow into the receiving cavity in the front-to-back, left-to-right and up-and-down directions, characterized in that: The retaining frame includes a plurality of spacers made of hydrophobic plastic material, and the plurality of spacers are arranged side by side in the accommodating cavity along the left-right direction to define the accommodating cavity into a plurality of insert slots for the graphite bipolar plates to be placed side by side and spaced apart in the left-right direction. The graphite bipolar plates are suitable for being loaded into the insert slots from front to back and arranged vertically, so that the inlet and outlet areas of each graphite bipolar plate with medium inlet and outlet are located at the upper end and the lower end, and the flow field reaction area is located between the two inlet and outlet areas; wherein, the spacer is provided with a reinforcement bar group consisting of a plurality of reinforcement bars corresponding to the inlet and outlet areas, and the reinforcement bar group is used to contact the graphite bipolar plate to keep it in an upright state, and the spacer is provided with a guide bar corresponding to the flow field reaction area, and the guide bar includes a plurality of inclined sections extending obliquely in the up-down direction to disturb and guide the liquid flow between the middle flow field reaction areas of two adjacent graphite bipolar plates, and the distance between the middle flow field reaction areas of two adjacent graphite bipolar plates defined by the spacer is not less than 2 mm.

2. The impregnation cleaning tool for graphite bipolar plates according to claim 1, characterized in that: The spacer comprises a rectangular outline frame, the guide strip is located in the outline frame and extends in a wave shape in the up and down direction.

3. The impregnation cleaning tool for graphite bipolar plates according to claim 2, characterized in that: The wave crest points and wave trough points of the wave-shaped guide strip are respectively connected to two edges in the width direction of the outline frame.

4. The impregnation cleaning tool for graphite bipolar plates according to claim 2, characterized in that: The reinforcement strip group is arranged at two ends of the outline frame in the length direction, and the reinforcement strips included in the reinforcement strip group are respectively connected to two sides of the outline frame in the width direction.

5. The impregnation cleaning tool for graphite bipolar plates according to claim 4, characterized in that: The outline frame, the guide strip and the reinforcement strip are all composed of cylindrical plastic strips with a diameter between 2.5 and 4.5 mm.

6. The impregnation cleaning tool for graphite bipolar plates according to any one of claims 1 to 5, characterized in that: The spacer is a PTFE or PFA injection molded part.

7. The impregnation cleaning tool for graphite bipolar plates according to any one of claims 1 to 5, characterized in that: The retaining frame includes a plurality of pads, which are arranged at both ends of the spacer in the up and down directions and are located between two adjacent spacers to support the insertion slot formed between the two adjacent spacers, and the width of the insertion slot is not greater than 3mm.

8. The impregnation cleaning tool for graphite bipolar plates according to claim 7, characterized in that: The pad is detachably connected to the spacer, and the pad includes at least two types of pads with different heights, and the two types of pads can be replaceably assembled on the spacer; or, a plurality of pads are fixedly connected to each of the spacers, and the spacers include at least two types of pads with different heights fixed thereon, and the two types of spacers can be replaceably assembled in the accommodating cavity.

9. The impregnation cleaning tool for graphite bipolar plates according to any one of claims 1 to 5, characterized in that: The outer frame includes a strip-shaped baffle plate arranged on the front side thereof, and two ends of the strip-shaped baffle plate are detachably connected to the left and right side walls.

10. The impregnation cleaning tool for graphite bipolar plates according to claim 9, characterized in that: The upper ends of the left and right side walls are provided with lifting pieces for facilitating the lifting and placement of the immersion cleaning tool.

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