Large-size flow channel graphite bipolar plate automatic water bath drying system

Abstract

The present application relates to the technical field of liquid flow battery energy storage device manufacturing equipment, and particularly relates to a large-size flow channel graphite bipolar plate automatic water bath drying system, which comprises a water bath device, a loading device, a drying device and a material moving device, the water bath device is provided with a water bath tank and a supporting plate arranged in the water bath tank, the loading device is provided with a cover plate and a first moving mechanism for driving the cover plate to move, the cover plate is used for covering the bipolar plate on the supporting plate, and the material moving device is used for grabbing and moving the bipolar plate. On the one hand, the present application automatically takes out the solidified and formed bipolar plate from the forming mold, so that the forming mold can be directly used for producing the next bipolar plate, on the other hand, the present application automatically immerses the bipolar plate in warm water and makes it be squeezed in two directions by the supporting plate and the cover plate, so that the bipolar plate uniformly and slowly releases internal stress and suppresses its own warping, and after drying, the finished product of the bipolar plate can be directly obtained, and the whole process has high production efficiency.

Description

Technical Field

[0001] This invention relates to the field of manufacturing equipment for flow battery energy storage devices, specifically to an automatic water bath drying system for large-size flow channel graphite bipolar plates. Background Technology

[0002] The flow channel of the bipolar plate is a long, narrow and deep groove structure. When the groove structure is subjected to force, a local peak stress much higher than the nominal stress will be generated at the corner, resulting in a geometric stress concentration area at the intersection of the flow channel and the plane.

[0003] When using hot molding to prepare larger bipolar plates, the increased area of ​​the bipolar plate makes it more difficult to uniformly compact the powder and fully wet the resin, which amplifies the non-uniformity of various parts of the bipolar plate and makes the stress concentration problem in the geometric stress concentration area more significant.

[0004] After the bipolar plate is removed from the molding die, the traditional process places the hot-molded bipolar plate on a platform to flatten it and allow it to cool naturally. Due to the excessively rapid cooling rate of the large-scale bipolar plate, the stress inside cannot be released evenly, resulting in severe deformation of the geometric stress concentration area, which in turn causes the bipolar plate to warp. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic water bath drying system for large-size flow channel graphite bipolar plates, in order to solve the problem that the stress cannot be uniformly released during the rapid cooling of large-size bipolar plates prepared by the traditional molding method, which leads to severe warping of the large-size bipolar plates.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: An automatic water bath drying system for large-size flow channel graphite bipolar plates includes: a water bath device, disposed on the side of a molding die, having a water bath tank and a support plate disposed in the water bath tank, wherein the support plate is used to place the bipolar plates taken out from the molding die and to immerse the bipolar plates in the water bath tank for heat treatment. A loading device is provided on the side of a water bath, and includes a cover plate and a first moving mechanism for driving the cover plate to move. The cover plate is used to cover the bipolar plate on the support plate to suppress the edge of the bipolar plate from lifting. A drying device is located beside the water bath and is used to receive and dry the bipolar plates that have undergone the heat treatment. The material transfer device includes a suction cup manipulator and a second moving mechanism for driving the suction cup manipulator. The suction cup manipulator is used to adsorb the top wall of the bipolar plate to grasp it, and the second moving mechanism is used to drive the grasped bipolar plate to move it between the molding mold, the water bath and the drying device.

[0007] As another embodiment of the present invention, the loading device further includes a third moving mechanism, the execution part of which is connected to the support plate to lift the support plate and the bipolar plate it supports to above the water surface or to submerge it below the water surface.

[0008] Furthermore, the execution part of the third moving mechanism is connected to a lower support block and an upper pressure block, and the bottom of the support plate is provided with a foot, which does not contact the lower support block; When the cover plate covers the support plate, the lower support block is located below the support plate, the upper pressure block is located above the cover plate, and the distance between the lower support block and the upper pressure block is greater than the distance between the top wall of the cover plate and the bottom wall of the support plate. In the first working condition, the lower support block and the upper pressure block descend to the first position, the bottom foot contacts the bottom wall of the water bath, the lower support block separates from the bottom wall of the support plate, and the upper pressure block contacts the cover plate and applies pressure to it; In the second operating condition, the lower support block and the upper pressure block rise to the second position, the lower support block contacts the bottom wall of the support plate and lifts it out of the water surface, the upper pressure block separates from the cover plate, and the gap height between the upper pressure block and the cover plate satisfies the following condition: the first moving mechanism can move the cover plate out from between the bipolar plate and the upper pressure block.

[0009] Furthermore, a lower perforated plate is fixedly connected to the bottom of the support plate, the lower perforated plate is used to suppress the bending of the support plate, and the bottom foot is fixedly installed on the bottom of the lower perforated plate; An upper perforated plate is fixedly connected to the top of the cover plate, and the upper perforated plate is used to suppress the bending of the cover plate.

[0010] Furthermore, a structural plate is installed on the top of the upper hollow plate, and the upper hollow plate is suspended below the structural plate by a number of pins. Each pin is fitted with an elastic element, and the elastic element connects the upper hollow plate and the structural plate.

[0011] Furthermore, during the same compression stroke, the elastic force provided by each elastic element near the edge of the upper perforated plate is less than the elastic force provided by each elastic element near the center of the upper perforated plate.

[0012] Furthermore, one end of the pin is fixedly connected to the upper perforated plate, and the other end of the pin passes through the structural plate and is threaded. Each of the pins is threaded with a nut, and the nut abuts against the top of the structural plate.

[0013] Furthermore, an external threaded sleeve is fixedly installed on the structural plate, the external threaded sleeve is threadedly connected to the structural plate, and the external threaded sleeve is slidably connected to the pin, and the elastic element is installed between the external threaded sleeve and the upper hollow plate.

[0014] Furthermore, the structural plate includes a quick connector for connecting the first moving mechanism, enabling the first moving mechanism to grasp or release the cover plate.

[0015] Furthermore, the water bath device also includes a warm water circulation system, which is connected to the inlet and outlet of the water bath tank to supply circulating warm water to the water bath tank.

[0016] Compared with the prior art, the present invention has the following advantages: On the one hand, the present invention automatically removes the solidified bipolar plate from the molding mold, so that the molding mold can be used directly and quickly to produce the next bipolar plate. On the other hand, the present invention automatically immerses the bipolar plate in warm water to cool it down and makes it bidirectionally squeezed by the support plate and the cover plate, so that the bipolar plate releases internal stress evenly and slowly and is suppressed from warping. After drying, the finished bipolar plate can be obtained directly, and the whole process has high production efficiency. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a perspective view of an embodiment of the present invention; Figure 2 This is a perspective view of the water bath device and loading device according to an embodiment of the present invention; Figure 3 This is a top view of the water bath device according to an embodiment of the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction, showing the first working condition; Figure 5 for Figure 4 A schematic diagram for the second operating condition; Figure 6 This is a top view of a partial structure of the cover plate according to an embodiment of the present invention; Figure 7 for Figure 6 A cross-sectional view along the BB direction.

[0019] The reference numerals in the figure are as follows: 1-Bipolar plate; 11-Upper mold; 12-Lower mold; 2-Water bath device; 21-Water bath tank; 22-Support plate; 221-Base; 222-Lower hollow plate; 3-Loading device; 31-Cover plate; 311-Upper hollow plate; 312-Pin; 313-Nut; 32-First moving mechanism; 33-Third moving mechanism; 34-Lower support block; 35-Upper pressure block; 36-Structural plate; 361-External threaded sleeve; 362-Quick connector; 37-Elastic element; 4-Transfer device; 41-Suction cup robot; 42-Second moving mechanism. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] After the bipolar plate is removed from the molding die, the traditional process places the hot-molded bipolar plate on a platform to flatten it and allow it to cool naturally. Due to the excessively rapid cooling rate of the large-scale bipolar plate, the stress inside cannot be released evenly, resulting in severe deformation of the geometric stress concentration area, which in turn causes the bipolar plate to warp.

[0022] To reduce the cooling rate of the bipolar plates and allow for a uniform and slow release of internal stress, refer to Figure 1 and Figure 2 This application proposes an automatic water bath drying system for large-size flow channel graphite bipolar plates, which includes: a water bath device 2, a loading device 3, a drying device and a material transfer device 4.

[0023] The water bath device 2 is located on the side of the molding die, and includes a water bath tank 21 and a support plate 22 disposed in the water bath tank 21. The support plate 22 is used to place the bipolar plate 1 taken out from the molding die and to immerse the bipolar plate 1 in the water bath tank 21 for heat treatment. The loading device 3 is located on the side of the water bath 21 and has a cover plate 31 and a first moving mechanism 32 for driving the cover plate 31 to move. The cover plate 31 is used to cover the bipolar plate 1 on the support plate 22 to suppress the edge of the bipolar plate 1 from lifting. The drying device is located beside the water bath 21 and is used to receive and dry the heat-treated bipolar plates 1. The material transfer device 4 includes a suction cup manipulator 41 and a second moving mechanism 42 for driving the suction cup manipulator 41 to move. The suction cup manipulator 41 is used to adsorb the top wall of the bipolar plate 1 to grasp it, and the second moving mechanism 42 is used to drive the grasped bipolar plate 1 to move it between the molding mold, the water bath 21 and the drying device.

[0024] In the above system, the drying device is not shown in the figure. The first moving mechanism 32 and the second moving mechanism 42 can be multi-axis industrial robots. The cover plate 31 has a certain weight so that it can flatten the bipolar plate 1.

[0025] This invention automatically removes the solidified bipolar plate from the molding mold, allowing the molding mold to be used directly and quickly to produce the next bipolar plate. Then, the bipolar plate is automatically immersed in warm water to cool it down and is bidirectionally squeezed by the support plate and the cover plate, so that the internal stress of the bipolar plate is released evenly and slowly and its warping is suppressed. After drying, the finished bipolar plate can be obtained directly. The whole process has high production efficiency.

[0026] The temperature of the warm water is constant and higher than that of natural cooling, specifically set at 60-90℃. This reduces the temperature difference in bipolar plate cooling. During heating, the heat transfer efficiency of water is much higher than that of air, and the homogeneity of water temperature is also higher than that of air. This ensures that the cooling rate of each part of the plate is almost the same on two levels, and the volume shrinkage occurs almost simultaneously. This reduces the impact of the large difference between the surface shrinking and the core still expanding at high temperature, effectively reducing the internal stress caused by shrinkage due to large non-uniformity.

[0027] The automatic water bath drying process of the above system is as follows: Step 1: The press drives the upper mold 11 and lower mold 12 of the forming mold to open, exposing the top of the bipolar plate 1.

[0028] Step 2: The second moving mechanism 42 drives the suction cup robot 41 to adsorb the top wall of the bipolar plate 1, and moves the bipolar plate 1 onto the support plate 22 through the second moving mechanism 42, and releases the vacuum adsorption so that the bipolar plate 1 is placed flat on the top surface of the support plate 22.

[0029] Step 3: The first moving mechanism 32 drives the cover plate 31 to cover the top wall of the bipolar plate 1 so that the bipolar plate 1 is flattened.

[0030] Step 4: Pour warm water into the water bath 21 until the bipolar plate 1 is submerged, then continue to flatten the bipolar plate 1 and maintain its temperature until the stress inside the bipolar plate 1 is uniformly released.

[0031] Step 5: Drain the warm water from the water bath 21 until the bipolar plate 1 is above the water surface. Then, the first moving mechanism 32 drives the cover plate 31 to leave the bipolar plate 1, and the second moving mechanism 42 drives the suction cup robot 41 to adhere to the top wall of the bipolar plate 1, moving the bipolar plate 1 from the water bath 21 into the interior of the drying device.

[0032] Step 6: The drying device dries the residual moisture on the surface of the bipolar plate 1 to obtain the finished bipolar plate 1.

[0033] In the above steps, the water bath 21 needs to be repeatedly filled and drained with warm water, which affects production efficiency. At the same time, when the bipolar plate 1 is placed on the top wall of the support plate 22, it may warp due to sudden cooling. In order to reduce the adverse effects of temperature changes in the support plate 22 and improve production efficiency,

[0034] refer to Figure 3 , Figure 4 and Figure 5 In a preferred embodiment, the loading device 3 further includes a third moving mechanism 33, the execution part of which is connected to the support plate 22 to lift the support plate 22 and the bipolar plate 1 it supports to above the water surface or below the water surface.

[0035] In this preferred embodiment, after the third moving mechanism 33 pushes the support plate 22 out of the water surface, the bipolar plate 1 can be placed on or removed from the support plate 22 without repeatedly injecting and draining warm water into the water bath 21, thereby improving production efficiency. Subsequently, the support plate 22 can be lowered below the water surface. The whole process takes a short time, and the temperature change of the support plate 22 is not significant, thus avoiding warping caused by sudden cooling of the bipolar plate 1.

[0036] Flattening the plasterboard requires a significant amount of weight, so the cover plate 31 is designed to be relatively thick and heavy, which will affect the heat conduction performance of the cover plate 31 and thus affect the efficiency of the temperature conduction of warm water to the bipolar plate 1.

[0037] Therefore, in this embodiment, the cover plate 31 is designed to be thinner, so that it has excellent heat conduction performance. At the same time, in order not to reduce the performance of the cover plate 31 in flattening the bipolar plate 1, an upper pressure block 35 is added to the execution part of the third moving mechanism 33, so that it has the function of pressing down the cover plate 31.

[0038] Specific design scheme reference Figure 4 and Figure 5 The actuator of the third moving mechanism 33 is connected to the lower support block 34 and the upper pressure block 35. The bottom of the support plate 22 is provided with a foot 221, which does not contact the lower support block 34.

[0039] When the cover plate 31 covers the support plate 22, the lower support block 34 is located below the support plate 22, the upper pressure block 35 is located above the cover plate 31, and the distance between the lower support block 34 and the upper pressure block 35 is greater than the distance between the top wall of the cover plate 31 and the bottom wall of the support plate 22.

[0040] In the first working condition, the lower support block 34 and the upper pressure block 35 descend to the first position, the bottom foot 221 contacts the bottom wall of the water bath 21, the lower support block 34 separates from the bottom wall of the support plate 22, and the upper pressure block 35 contacts the cover plate 31 and applies pressure to it.

[0041] In the second working condition, the lower support block 34 and the upper pressure block 35 rise to the second position. The lower support block 34 contacts the bottom wall of the support plate 22 and lifts it out of the water surface. The upper pressure block 35 separates from the cover plate 31, and the gap height between the upper pressure block 35 and the cover plate 31 satisfies the following condition: the first moving mechanism 32 can move the cover plate 31 out from between the bipolar plate 1 and the upper pressure block 35.

[0042] First operating condition reference Figure 4 Second working condition reference Figure 5 The third moving mechanism 33 adopts a hydraulic cylinder. The piston rod of the hydraulic cylinder extends through the bottom plate of the water bath 21 into the interior of the water bath 21. The piston rod is connected to the water bath 21 by a guide sleeve and sealed by a sealing ring. The lower support block 34 and the upper pressure block 35 are both mounted on the piston rod.

[0043] In the above design, only one set of hydraulic cylinders is needed to complete the synchronous lifting, moving closer and further away from each other of the support plate 22 and the cover plate 31. This can both push the bipolar plate 1 out of the water or submerge it below the water surface, and provide pressure to the cover plate 31 to flatten the bipolar plate 1.

[0044] Furthermore, in order to improve the heat conduction effect of the support plate 22 and the cover plate 31, both are designed to be relatively thin, for example, 3~5mm. This makes the support plate 22 and the cover plate 31 easy to bend when under pressure, which in turn causes the bipolar plate 1, which should have been flattened, to bend in an unexpected direction.

[0045] Therefore, it is necessary to improve the structural strength of the support plate 22 and the cover plate 31 without reducing their thermal conductivity. Based on the above objectives, the improvement schemes for the support plate 22 and the cover plate 31 are as follows: a lower perforated plate 222 is fixedly connected to the bottom of the support plate 22, which is used to suppress the bending of the support plate 22, and a foot 221 is fixedly installed at the bottom of the lower perforated plate 222; an upper perforated plate 311 is fixedly connected to the top of the cover plate 31, which is used to suppress the bending of the cover plate 31.

[0046] In the above design, the lower support block 34 no longer directly contacts the support plate 22, but lifts the support plate 22 by lifting the lower hollow plate 222.

[0047] The perforated plate can increase the bending resistance of the support plate 22 and the cover plate 31 on the one hand, and ensure that the warm water can directly contact the back of the support plate 22 and the cover plate 31 on the other hand, ensuring that the temperature of both is always close to the set temperature of the warm water.

[0048] However, the upper perforated plate 311 is different from the lower perforated plate 222. The lower perforated plate 222 is usually submerged below the water surface. Even if the support plate 22 pushes the bipolar plate 1 out of the water, the lower perforated plate 222 does not need to be removed from the water surface. Therefore, the temperature change of the lower perforated plate 222 is less than that of the upper perforated plate 311. The upper perforated plate 311 is more likely to deform due to its own thermal expansion and contraction.

[0049] Furthermore, the bottom feet 221 are fully distributed on the bottom of the lower perforated plate 222 so that the back of the lower perforated plate 222 is evenly supported and the lower perforated plate 222 deforms less when pressed. However, in order to facilitate the first moving mechanism 32 to move out and into the cover plate 31 between the bipolar plate 1 and the upper pressure block 35, the upper pressure block 35 only presses the edge of the upper perforated plate 311. Therefore, the upper perforated plate 311 deforms more when pressed, resulting in uneven force on the bipolar plate 1 and affecting the flattening effect of the bipolar plate 1.

[0050] For the reasons mentioned above, the upper perforated plate 311 requires additional stress compensation design to ensure that all parts of it output the same pressure to the bipolar plate 1, as shown in the reference. Figure 6 , Figure 7 A structural plate 36 is installed on the top of the upper perforated plate 311. The upper perforated plate 311 is suspended below the structural plate 36 by several pins 312. Each pin 312 is fitted with an elastic element 37, which connects the upper perforated plate 311 and the structural plate 36.

[0051] The staff can adjust the elastic force provided by each elastic element 37 as needed, for example, by changing the stiffness, pre-compression amount, and number of elastic elements 37, thereby compensating for the stress on the upper hollow plate 311.

[0052] Furthermore, in order to ensure that the lower pressure block can be accurately lifted to its original position after separating from the lower hollow plate 222, a guide structure is designed between the lower pressure block and the lower hollow plate 222; correspondingly, a guide structure is also designed between the structural plate 36 and the lower hollow plate 222; the guide structure can be a guide post, guide sleeve or conical positioning component or other structural component.

[0053] Based on the above embodiments, the force on the edge of the structural plate 36 is greater than the force on its center. In order to ensure that the structural plate 36 outputs a uniform force to the upper hollow plate 311, each elastic element 37 is configured such that, in the same compression stroke, the elastic force provided by each elastic element 37 near the edge of the upper hollow plate 311 is less than the elastic force provided by each elastic element 37 near the center of the upper hollow plate 311.

[0054] This ensures that when the edge of the structural plate 36 is subjected to pressure from the upper pressure block 35, the structural plate 36 transmits the same pressure to the center and edge of the upper perforated plate 311, thereby keeping the cover plate 31 flat and simultaneously outputting the same pressure to all parts of the bipolar plate 1.

[0055] The specific stiffness, pre-compression amount, quantity, and other parameters of the elastic element 37 can be obtained through experiments. For example, several pressure sensors arranged in a rectangular array are placed on a flat plate, and then the cover plate 31 is driven to squeeze these pressure sensors. The rebound force of the elastic element 37 is adjusted according to the pressure data collected by the pressure sensors so that the pressure data collected by each pressure sensor is basically the same.

[0056] refer to Figure 7 The specific connection method between the upper perforated plate 311 and the structural plate 36 is as follows: one end of the pin 312 is fixedly connected to the upper perforated plate 311, the other end of the pin 312 passes through the structural plate 36 and is threaded, and each pin 312 thread is fitted with a nut 313, which abuts against the top of the structural plate 36.

[0057] This design allows workers to rotate the nut 313 to change its height on the pin 312, thereby changing the distance between the upper perforated plate 311 and the structural plate 36.

[0058] Furthermore, in order to facilitate the staff to change the pre-compression amount of each elastic element 37, the following technical means are also designed in this embodiment: an external threaded sleeve 361 is fixedly installed on the structural plate 36, the external threaded sleeve 361 is threadedly connected to the structural plate 36, and the external threaded sleeve 361 is slidably connected to the pin 312, and the elastic element 37 is installed between the external threaded sleeve 361 and the upper hollow plate 311.

[0059] Simultaneously rotating the nut 313 and the external threaded sleeve 361 can change the height of the external threaded sleeve 361, but not the height of the upper hollow plate 311. This allows the relative distance between each external threaded sleeve 361 and the upper hollow plate 311 to be adjusted independently, thereby allowing the operator to change the pre-compression of each elastic element 37 based on this design, thus changing the elastic force provided by each elastic element 37.

[0060] In addition, the structural plate 36 includes a quick connector 362 for connecting the first moving mechanism 32, so that the first moving mechanism 32 can grasp or release the cover plate 31.

[0061] The water bath device 2 also includes a warm water circulation system, which is connected to the inlet and outlet of the water bath tank 21 to supply circulating warm water (60-90℃) to the water bath tank 21.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. All such modifications or substitutions should be covered within the protection scope of this application, and should not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An automatic water bath drying system for large-size flow channel graphite bipolar plates, characterized in that, include: A water bath device (2) is provided on the side of the molding die, and has a water bath tank (21) and a support plate (22) provided in the water bath tank (21). The support plate (22) is used to place the bipolar plate (1) taken out from the molding die and to immerse the bipolar plate (1) in the water bath tank (21) for heat treatment. The loading device (3) is located on the side of the water bath (21) and has a cover plate (31) and a first moving mechanism (32) for driving the cover plate (31) to move. The cover plate (31) is used to cover the bipolar plate (1) on the support plate (22) to suppress the edge of the bipolar plate (1) from lifting. A drying device is installed on the side of the water bath (21) to receive and dry the bipolar plates (1) that have undergone the heat treatment. The material transfer device (4) includes a suction cup manipulator (41) and a second moving mechanism (42) for driving the suction cup manipulator (41) to move. The suction cup manipulator (41) is used to adsorb the top wall of the bipolar plate (1) to grasp it, and the second moving mechanism (42) is used to drive the grasped bipolar plate (1) to move it between the molding mold, the water bath (21) and the drying device.

2. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 1, characterized in that, The loading device (3) further includes a third moving mechanism (33), the execution part of which is connected to the support plate (22) to lift the support plate (22) and the bipolar plate (1) it supports to above the water surface or below the water surface.

3. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 2, characterized in that, The execution part of the third moving mechanism (33) is connected to the lower support block (34) and the upper pressure block (35). The bottom of the support plate (22) is provided with a foot (221), which does not contact the lower support block (34). When the cover plate (31) covers the support plate (22), the lower support block (34) is located below the support plate (22), the upper pressure block (35) is located above the cover plate (31), and the distance between the lower support block (34) and the upper pressure block (35) is greater than the distance between the top wall of the cover plate (31) and the bottom wall of the support plate (22); In the first working condition, the lower support block (34) and the upper pressure block (35) descend to the first position, the bottom foot (221) contacts the bottom wall of the water bath tank (21), the lower support block (34) separates from the bottom wall of the support plate (22), and the upper pressure block (35) contacts the cover plate (31) and applies pressure to it; In the second working condition, the lower support block (34) and the upper pressure block (35) rise to the second position, the lower support block (34) contacts the bottom wall of the support plate (22) and lifts it out of the water surface, the upper pressure block (35) separates from the cover plate (31), and the gap height between the upper pressure block (35) and the cover plate (31) satisfies the following condition: the first moving mechanism (32) can move the cover plate (31) out from between the bipolar plate (1) and the upper pressure block (35).

4. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 3, characterized in that, The bottom of the support plate (22) is fixedly connected to a lower hollow plate (222), which is used to suppress the bending of the support plate (22), and the bottom foot (221) is fixedly installed on the bottom of the lower hollow plate (222). The top of the cover plate (31) is fixedly connected to an upper perforated plate (311), which is used to suppress the bending of the cover plate (31).

5. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 4, characterized in that, A structural plate (36) is installed on the top of the upper hollow plate (311). The upper hollow plate (311) is suspended below the structural plate (36) by a number of pins (312). Each pin (312) is fitted with an elastic element (37). The elastic element (37) connects the upper hollow plate (311) and the structural plate (36).

6. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 5, characterized in that, During the same compression stroke, the elastic force provided by each of the elastic elements (37) near the edge of the upper perforated plate (311) is less than the elastic force provided by each of the elastic elements (37) near the center of the upper perforated plate (311).

7. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 6, characterized in that, One end of the pin (312) is fixedly connected to the upper hollow plate (311), and the other end of the pin (312) passes through the structural plate (36) and is threaded. Each of the pins (312) is threaded with a nut (313), and the nut (313) abuts against the top of the structural plate (36).

8. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 7, characterized in that, An external threaded sleeve (361) is fixedly installed on the structural plate (36). The external threaded sleeve (361) is threadedly connected to the structural plate (36), and the external threaded sleeve (361) is slidably connected to the pin (312). The elastic element (37) is installed between the external threaded sleeve (361) and the upper hollow plate (311).

9. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 5, characterized in that, The structural plate (36) includes a quick connector (362) for connecting the first moving mechanism (32) so that the first moving mechanism (32) can grasp or release the cover plate (31).

10. The large-size flow channel graphite bipolar plate automatic water bath drying system according to claim 1, characterized in that, The water bath device (2) also includes a warm water circulation system, which is connected to the inlet and outlet of the water bath tank (21) to supply circulating warm water to the water bath tank (21).

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