CN219597824U - A cold-pressed microchannel composite bipolar plate mold - Google Patents

Abstract

The utility model discloses a micro-channel composite bipolar plate mold formed by cold pressing, which comprises: a first mold base and a second mold base opposite to each other; a gap between the first mold base and the second mold base A first mold, a discharge frame and a demoulding module are arranged in sequence; the first mold base is fixedly connected with the first mold, and is slidably connected with the discharge frame; the first mold is provided with a microfluidic The channel structure, the micro-channel structure includes: a first main channel and a second main channel arranged in parallel; the first main channel and the second main channel are communicated through a plurality of first sub-channels; the The junction of the first flow channel and the first main flow channel forms a second flow channel; the radius of the second flow channel is smaller than that of the first flow channel. The utility model can balance the gas in the flow channel through the setting of the micro flow channel structure, prevent water vapor condensation during reaction, and improve the performance of the bipolar plate.

Description

A cold-pressed microchannel composite bipolar plate mold

technical field

The utility model relates to the technical field of bipolar plate processing, in particular to a micro-channel composite bipolar plate die formed by cold pressing.

Background technique

The bipolar plate accounts for more than 60% of the overall proportion of the entire proton exchange mode fuel cell stack, and it accounts for more than 30% of the overall cost of the entire battery. It is one of the core components of the proton exchange mode battery and is in the single structure of the entire battery building The outermost layer plays the role of supporting the stack, collecting current, dissipating heat and transporting reaction gas. With the development of technology, the flow channel design of the bipolar plate has changed from the traditional mold to the more advanced parallel flow channel design. Because gas and water are transported through the flow channel in the semiconductor, and gas and water are also a key to the function of the bipolar plate and even the fuel cell, but the structure of the parallel channel mold is relatively simple, and the gas The easy distribution in the flow channel is uneven, which makes the water vapor condense in the pipeline, hinders the gas transportation, and seriously affects the efficiency of the bipolar plate.

Utility model content

In view of this, the purpose of this utility model is to provide a micro-channel composite bipolar plate mold formed by cold pressing, which has a simple and reasonable structure. Through the setting of the micro-channel structure, the gas in the channel can be balanced to prevent the reaction from occurring. Water vapor condenses, improving the performance of the bipolar plates.

A micro-channel composite bipolar plate mold formed by cold pressing, comprising: a first mold base and a second mold base opposite to each other; a first mold base and a second mold base are sequentially arranged between the first mold base and the second mold base mold, discharge frame and demoulding module; the first mold base is fixedly connected with the first mold, and is slidably connected with the discharge frame; the first mold is provided with a micro-channel structure, the The micro-flow channel structure includes: a first main channel and a second main channel arranged in parallel; the first main channel and the second main channel are communicated through a plurality of first sub-channels; The junction of the first main channel forms a second branch channel; the radius of the second branch channel is smaller than that of the first branch channel.

In the above technical solution, the pressure of the first main channel can be increased and the pressure of the second main channel can be lowered by forming the second channel with a radius smaller than the first channel at the junction of the first channel and the first main channel, Reduce the relative difference in pressure drop between the first sub-channels, balance the distribution of gas in the entire flow channel during the transmission process, and help improve drainage performance to prevent water vapor condensation during reaction, greatly improving gas utilization and drainage ability to improve the performance of bipolar plates.

As a preferred technical solution of the present invention, the first sub-channels are arranged in parallel and evenly arranged between the first main channel and the second main channel.

In the above technical solution, the first sub-channels are evenly arranged in parallel, which can ensure the uniform distribution of the gas in the entire flow channel structure and improve the utilization rate of the gas.

As a preferred technical solution of the present utility model, the first runners are divided by flow plates; The direction of the secondary main channel extends.

In the above technical solution, one end of the flow plate is in the shape of an inverted T, and the raised part formed on the side of the inverted T can play the role of turbulent flow on the one hand, and on the other hand, make the pressure of the first sprue relative to the second sprue The drop is larger, thereby improving the efficiency of the bipolar plate.

As a preferred technical solution of the present invention, an insertion hole is provided in the middle of the first mold base; and an insertion block matching the insertion hole is arranged on the first mold.

In the above technical solution, the connection stability between the first mold base and the first mold can be ensured through the matching socket holes and socket blocks.

As a preferred technical solution of the present invention, the four corners of the first mold base are also provided with guide posts, and the guide posts extend along the direction of the discharge frame; Pilot holes for matching posts.

In the above technical solution, the first mold base is connected with the guide hole of the discharge frame through the guide column, and the first mold base can be moved toward the direction of the discharge frame through the sliding fit of the guide column and the guide hole, thereby driving the first The mold is extruded toward the discharge frame, and the setting of the guide column and the guide hole ensures the repeated use of the whole mold and improves the practicability.

As a preferred technical solution of the present invention, one side of the demoulding module is fixedly connected to the discharge frame, and the other side is fixedly connected to the second mold base.

As a preferred technical solution of the present invention, the demoulding module includes: a demoulding backing plate, a limiting plate and an elastic group wrapped in the demoulding frame in sequence; the two ends of one side of the limiting plate pass through The bracket is fixedly connected to the second mold base; the elastic group includes several springs, and is arranged inside the bracket, and a through hole matching the spring is formed on the limiting plate; one end of the spring It is fixedly connected with the second mold base, and the other end is in contact with the release pad through the through hole.

In the above technical solution, by setting the demoulding backing plate, it can ensure that the composite material is evenly stressed during the pressing process, and the molding of the composite material can be ensured; On the one hand, the size of the composite material can be limited; by setting the elastic group to ensure that the whole plate rises slowly on the same level, and is finally ejected into the discharge frame.

As a preferred technical solution of the present invention, the springs are distributed in an array.

In the above technical solution, the arrangement of springs distributed in an array can ensure uniform force on the demoulding pad, and can improve the speed of spring rebound, and can be recycled many times in a short period of time, improving the use efficiency of the mold.

As a preferred technical solution of the present utility model, a placement through slot is formed in the middle of the discharge frame, and the shape and size of the placement slot are adapted to the shape and size of the first mould.

In the above technical solution, the first mold adapted to the placement through groove can ensure the stability of the composite material in pressing, so as to facilitate the molding of the composite material.

As a preferred technical solution of the present utility model, the demoulding backing plate is moved and arranged between the demoulding frame and the placement through groove; match.

In the above technical solution, the stripping backing plate is moved between the stripping frame and the placement channel. During the compression and rebound process, the force on the lower surface of the stripping backing plate is even, and the return of the upper mold is slow during demoulding, ensuring micro The channel composite bipolar plate gradually rises under the action of the spring force, and finally the bipolar plate is directly ejected into the discharge frame, and the microchannel composite bipolar plate product with coordinated appearance and excellent performance can be obtained.

Compared with the prior art, the utility model has the beneficial effects of:

By forming a second runner with a radius smaller than that of the first runner at the junction of the first runner and the first runner, the pressure of the first runner can be raised and the pressure of the second runner can be lowered, so that each first runner The relative difference in pressure drop between the channels is reduced, and the distribution of gas in the entire flow channel is balanced during the transmission process, which is conducive to improving the drainage performance and preventing water vapor condensation during the reaction, greatly improving the utilization rate of the gas and the drainage capacity, thus improving the bipolar board performance.

To sum up, the micro-channel mold of the present invention can well improve the water management problem of the bipolar plate, and effectively avoid the phenomenon of water flooding.

Description of drawings

Fig. 1 is an exploded front view of the microchannel composite bipolar plate mold formed by cold pressing in this embodiment.

Fig. 2 is a schematic diagram of the micro-channel structure in the first mold.

FIG. 3 is an enlarged schematic view of part A in FIG. 2 .

Fig. 4 is a top view of the first mold base.

Figure 5 is a top view of the feeding frame

Fig. 6 is a side exploded view of the microchannel composite bipolar plate mold formed by cold pressing in this embodiment.

Explanation of reference signs:

The first mold base 100, the insertion hole 101, the guide column 102, the second mold base 200, the first mold 300, the first sprue 301, the second sprue 302, the first runner 303, the second runner 304, Flow plate 305, plug-in block 306, discharge frame 400, guide hole 401, placement channel 402, demoulding module 500, demoulding backing plate 501, demoulding frame 502, limit plate 503, elastic group 504, bracket 505 .

Detailed ways

In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. Preferred embodiments of the utility model are provided in the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein.

Please refer to FIG. 1 to FIG. 3 , in a preferred embodiment, a mold for a cold-pressed microchannel composite bipolar plate includes: a first mold base 100 and a second mold base 200 opposite to each other; Between the first mold base 100 and the second mold base 200, a first mold 300, a discharge frame 400 and a demoulding module 500 are sequentially arranged; the first mold base 100 is fixedly connected to the first mold 300, and It is slidingly connected with the discharge frame 400; the first mold 300 is provided with a micro-channel structure, and the micro-channel structure includes: a first main channel 301 and a second main channel 302 arranged in parallel; A main channel 301 communicates with the second main channel 302 through a plurality of first sub-channels 303; the junction of the first sub-channel 303 and the first main channel 301 forms a second sub-channel 304; The radius of the second flow channel 304 is smaller than that of the first flow channel 303 .

In this embodiment, the first main channel 301 can be an inflow channel; the second main channel 302 can be an outflow channel.

During specific implementation, by forming the second runner 304 with a radius smaller than that of the first runner 303 at the junction of the first runner 303 and the first runner 301, the pressure of the first runner 301 can be increased and the pressure of the second runner 301 can be reduced. The pressure of the main channel 302 reduces the relative difference in pressure drop between the first sub-channels 303, balances the distribution of gas in the entire flow channel during the transmission process, and is conducive to improving the drainage performance and preventing water vapor condensation during the reaction, greatly improving The gas utilization rate and drainage capacity are improved to improve the performance of the bipolar plate.

In this embodiment, the first sub-channels 303 are arranged in parallel and evenly arranged between the first main channel 301 and the second main channel 302 .

In the specific implementation process, the first sub-channels 303 are uniformly arranged in parallel, which can ensure the uniform distribution of the gas in the entire channel structure and ensure the improvement of the utilization rate of the gas.

In this embodiment, the micro-channel structure, the width of the first main channel 301 and the second main channel 302 is 2.00 mm, and the depth is 1.00 mm; the depth, width and width of the first branch channel 303 and the width of the ridge are both 1.00 mm; the second runner 304 has a width of 0.20 mm and a depth of 1.00 mm.

In this embodiment, the first branch channels 303 are divided by a flow plate 305; one end of the flow plate 305 close to the first main channel 301 is in an inverted T shape, and the other end is perpendicular to the second channel. The direction of the main channel 302 extends.

In the specific implementation process, one end of the flow plate 305 is in an inverted T shape, and the raised part formed on the side of the inverted T can play the role of turbulent flow on the one hand, and on the other hand, make the first sprue 301 relatively opposite to the second sprue. 302 has a greater pressure drop, which in turn increases the efficiency of the bipolar plate.

In this embodiment, an insertion hole 101 is provided in the middle of the first mold base 100 ;

Please refer to FIG. 4 , during the specific implementation process, the connection stability between the first mold base 100 and the first mold 300 can be ensured through the matching of the socket holes 101 and the socket blocks 306 .

In this embodiment, guide columns 102 are also provided at the four corners of the first mold base 100, and the guide columns 102 extend along the direction of the discharge frame 400; The guide hole 401 that the post 102 fits into.

Please refer to Fig. 1, Fig. 6 and Fig. 5, in the specific implementation process, the first mold base 100 is connected with the guide hole 401 of the discharge frame 400 through the guide post 102, and through the sliding fit between the guide post 102 and the guide hole 401, The first mold base 100 can be moved toward the discharge frame 400, thereby driving the first mold 300 to squeeze toward the discharge frame 400, and the setting of the guide column 102 and the guide hole 401 ensures the repeated use of the entire mold and improves the practicability .

Please refer to FIG. 1 and FIG. 6 , in this embodiment, one side of the demoulding module 500 is fixedly connected to the discharge frame 400 , and the other side is fixedly connected to the second mold base 200 .

In this embodiment, the demoulding module 500 includes: a demoulding pad 501, a limiting plate 503 and an elastic group 504 wrapped in the demoulding frame 502 in sequence; Fixedly connected to the second mold base 200 through a bracket 505; the elastic group 504 includes several springs, and is arranged inside the bracket 505, and a through hole matching the spring is formed on the limiting plate 503 ; One end of the spring is fixedly connected to the second mold base 200, and the other end is in contact with the release pad 501 through the through hole.

In the specific implementation process, by setting the stripping pad 501, it can ensure that the composite material is evenly stressed during the pressing process, and the molding of the composite material can be ensured; by setting the limit plate 503, the depth of the composite material can be limited on the one hand, On the other hand, the size of the composite material can be limited; the arrangement of the elastic group 504 ensures that the whole plate rises slowly on the same level, and is finally ejected into the discharge frame 400 .

In this embodiment, the springs are distributed in an array.

During the specific implementation process, the arrangement of springs distributed in an array can ensure the uniform force on the stripping pad 501, and can improve the spring rebound speed quickly, and can be recycled for many times in a short period of time, improving the use efficiency of the mold.

In this embodiment, a placing through slot 402 is formed in the middle of the discharging frame 400 , and the shape and size of the placing through slot 402 are adapted to the shape and size of the first mold 300 .

During the specific implementation process, the first mold 300 adapted to the placement through groove 402 can ensure the stability of the composite material pressing, so as to facilitate the molding of the composite material.

In this embodiment, the demoulding pad 501 is moved and arranged between the demoulding frame 502 and the placing through groove 402; match.

During the specific implementation process, the demoulding pad 501 is moved and arranged between the demoulding frame 502 and the placement channel 402. During the compression and rebound process, the lower surface of the demoulding pad 501 is evenly stressed, and the upper mold returns during demoulding. Slowly, to ensure that the micro-channel composite bipolar plate gradually rises under the action of the elastic force of the spring group, and finally the bipolar plate is directly ejected into the discharge frame 400, and a micro-channel composite bipolar plate with a coordinated appearance and excellent performance can be obtained board products.

It should be understood that the utility model has low production cost, and the cold press molding process can be operated at normal temperature without heating, and the operation time is short, saving a lot of manpower and material resources, and can meet mass production.

The working principle of the present utility model is as follows: Specifically, when the utility model is used, firstly, each part of the mold after cleaning is in accordance with the second mold base 200, elastic group 504, limit plate 503, demoulding backing plate 501, demoulding The frame 502, the discharge frame 400, the first mold 300, and the first mold base 100 are assembled into a whole in sequence, and then the first mold base 100 and the second mold base 200 are respectively connected to the hydraulic press, and poured into the discharge frame 400 evenly The composite material is pre-pressed and flattened, and then the first mold 300 is slowly pressed down and gradually matched with the first mold 300. The first mold base 100 collides with the discharge frame 400 and sticks closely together. The spring is compressed and waits for the composite material to solidify. Composite bipolar plate with a certain hardness, slowly lift the first mold 300, in the process of compression and rebound, the force on the lower surface of the demoulding pad 501 is uniform, and the return of the upper mold is slow during demoulding, ensuring the micro-channel composite bipolar plate The pole plate gradually rises under the action of the elastic force of the spring group, and finally the bipolar plate is directly ejected into the discharge frame 400, and a microchannel composite bipolar plate product with a coordinated appearance and excellent performance can be obtained.

In describing the present invention, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top ", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying Any device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

Although the description of the utility model is performed in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above contents. Accordingly, all such alternatives, modifications and changes are intended to be included within the spirit and scope of the appended claims.

Claims (10)

1. A microfluidic composite bipolar plate mold formed by cold pressing, characterized in that it comprises: Opposed first mold base (100) and second mold base (200); A first mold (300), a discharge frame (400) and a demoulding module (500) are sequentially arranged between the first mold base (100) and the second mold base (200); The first mold base (100) is fixedly connected with the first mold (300), and is slidably connected with the discharge frame (400); The first mold (300) is provided with a micro-channel structure, and the micro-channel structure includes: A first main channel (301) and a second main channel (302) arranged in parallel; a plurality of first branch channels (303) are passed between the first main channel (301) and the second main channel (302) communication; the junction of the first flow channel (303) and the first main flow channel (301) forms a second flow channel (304); the radius of the second flow channel (304) is smaller than that of the first flow channel Road (303). 2. the microchannel composite bipolar plate mold of cold press forming according to claim 1, is characterized in that, The first sub-channels (303) are arranged in parallel and evenly arranged between the first main channel (301) and the second main channel (302). 3. the microchannel composite bipolar plate mold of cold press forming according to claim 2, is characterized in that, The first branch channel (303) is divided by a flow plate (305); the end of the flow plate (305) close to the first main channel (301) is in an inverted T shape, and the other end is perpendicular to the The direction of the second main channel (302) extends. 4. the microchannel composite bipolar plate mold of cold press forming according to claim 3, is characterized in that, The middle part of the first mold base (100) is provided with an insertion hole (101); the first mold (300) is provided with an insertion block (306) matching the insertion hole (101). 5. the microchannel composite bipolar plate mold of cold press forming according to claim 4, is characterized in that, The four corners of the first mold base (100) are also provided with guide posts (102), and the guide posts (102) extend along the direction of the discharge frame (400); The discharging frame (400) is provided with a guide hole (401) matched with the guide column (102). 6. the microchannel composite bipolar plate mold of cold press forming according to claim 5, is characterized in that, One side of the demoulding module (500) is fixedly connected with the discharge frame (400), and the other side is fixedly connected with the second mold base (200). 7. the microchannel composite bipolar plate mold of cold press forming according to claim 6, is characterized in that, The demoulding module (500) includes: a demoulding pad (501), a limiting plate (503) and an elastic group (504) wrapped in the demoulding frame (502) in sequence; Both ends of one side of the limiting plate (503) are fixedly connected to the second mold base (200) through a bracket (505); The elastic group (504) includes several springs and is arranged inside the bracket (505), and a through hole matching the springs is formed on the limiting plate (503); One end of the spring is fixedly connected to the second mold base (200), and the other end passes through the through hole and contacts the stripping pad (501). 8 . The microchannel composite bipolar plate die formed by cold pressing according to claim 7 , wherein the springs are distributed in an array. 9. the microchannel composite bipolar plate mold of cold press forming according to claim 8, is characterized in that, A placement through slot (402) is formed in the middle of the discharge frame (400), and the shape and size of the placement slot (402) are adapted to the shape and size of the first mold (300). 10. the microchannel composite bipolar plate mold of cold press forming according to claim 9, is characterized in that, The demoulding pad (501) is moved and set between the demoulding frame (502) and the placement channel (402); the shape and size of the demoulding pad (501) are consistent with the placement channel groove (402).