A laminated cooling plate structure for a hydrogen fuel cell vehicle

Abstract

The utility model discloses a kind of laminated cooling plate structures for hydrogen fuel cell vehicle, including cooling plate unit, current collection assembly and connecting sealing assembly;Cooling plate unit is equipped with at least two layers, each layer contains rectangular cooling base plate, multiple branch parallel serpentine cooling liquid flow channel is opened in base plate, annular sealing groove is equipped in top surface, four corners have bolt mounting hole, both sides have positioning protrusion;Current collection assembly contains import and export current collection block, respectively set shunt cavity, confluence cavity, top extends cooling liquid inlet and outlet pipe;Connecting sealing assembly is fastened each layer base plate by bolt nut, sealing ring is embedded sealing groove and realizes interlayer sealing.The structure is improved heat exchange efficiency by multilayer design and uniform flow channel, positioning protrusion guarantees assembly precision, sealing assembly prevents leakage, adapts different power hydrogen fuel cell vehicle, solves the problems, such as traditional cooling plate heat exchange deficiency, positioning difference, sealing failure, and assembly and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology for hydrogen fuel cells, and specifically to a stacked cooling plate structure for hydrogen fuel cell vehicles. Background Technology

[0002] During operation, hydrogen fuel cell vehicles continuously generate chemical reaction heat and ohmic heat from the fuel cell stack. If this heat cannot be dissipated in time, it can lead to excessively high stack temperatures, affecting electrochemical reaction efficiency and battery life. Current technologies for hydrogen fuel cell vehicle cooling plates mostly employ a single-layer structure, which has the following shortcomings: First, the heat exchange area is limited, resulting in low cooling efficiency and difficulty in meeting the heat dissipation requirements of high-power-density fuel cell stacks; second, the lack of a dedicated positioning structure during stacking assembly easily leads to misalignment between layers, causing deviations in coolant flow channel alignment; third, the simple interlayer sealing structure design makes coolant leakage prone to occur; fourth, uneven distribution of coolant between cooling layers causes localized differences in heat exchange effects, affecting the temperature uniformity of the fuel cell stack; and fifth, the connecting components tend to protrude after assembly, interfering with the fit with individual fuel cell cells, and the lack of anti-loosening design allows vehicle vibrations to easily cause loosening of the assembly. Therefore, there is an urgent need for a stacked cooling plate structure that is highly efficient in heat exchange, reliably sealed, precisely positioned, and easy to assemble to solve the above-mentioned technical problems. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a stacked cooling plate structure for hydrogen fuel cell vehicles, aiming to solve problems such as insufficient heat exchange area of ​​single-layer cooling plates, interlayer sealing failure, low positioning accuracy, uneven coolant distribution, and assembly interference, thereby achieving the technical effects of efficient heat exchange, reliable sealing, precise positioning, and convenient assembly.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a stacked cooling plate structure for hydrogen fuel cell vehicles, including a cooling plate unit, a current collection assembly, and a connection sealing assembly.

[0005] The cooling plate unit has at least two layers, and each layer of cooling plate units is arranged in parallel stacks. Each layer of cooling plate unit includes a rectangular thin plate-shaped cooling substrate. Multiple parallel serpentine coolant channels are opened inside the cooling substrate. The inlet and outlet ends of the coolant channels extend to the same edge of the cooling substrate and form openings. An annular sealing groove is opened around the outer periphery of the coolant channels on the top surface of the cooling substrate. Bolt mounting holes are opened through the four corners of the cooling substrate. Long strip-shaped positioning protrusions are integrally formed on the left and right edges of the cooling substrate.

[0006] The current collection assembly includes an inlet current collection block and an outlet current collection block, both of which are rectangular block structures adapted to the edge of the cooling substrate. One side of the inlet current collection block has a flow distribution cavity that corresponds to the inlet end opening of the coolant flow channel in each layer of the cooling plate unit. The top of the inlet current collection block extends to form a coolant inlet pipe that communicates with the inside of the flow distribution cavity. One side of the outlet current collection block has a flow convergence cavity that corresponds to the outlet end opening of the coolant flow channel in each layer of the cooling plate unit. The top of the outlet current collection block extends to form a coolant outlet pipe that communicates with the inside of the flow convergence cavity.

[0007] The connection sealing assembly includes a bolt adapted to the bolt mounting hole, a nut that mates with the bolt, and a sealing ring embedded in the annular sealing groove. The bolt passes through the bolt mounting holes of each layer of cooling plate unit in sequence and is threadedly connected to the nut to fasten each layer of cooling plate unit. The cooling plate substrates of two adjacent layers of cooling plate units are sealed together by the sealing ring.

[0008] Furthermore, the multiple branches of the coolant flow channel are arranged in parallel at intervals, with one end of each branch connected to the inlet end of the coolant flow channel and the other end connected to the outlet end of the coolant flow channel, ensuring that the coolant is evenly distributed within the cooling substrate and improving heat exchange uniformity.

[0009] Furthermore, the positioning protrusion extends along the length of the cooling substrate, the top surface of the positioning protrusion is flush with the top surface of the cooling substrate, and the length of the positioning protrusion is the same as the length of the cooling substrate. The positioning protrusion is adapted to the edge groove of the adjacent fuel cell single cell and is embedded in the groove to achieve precise positioning of the cooling plate unit and the fuel cell single cell, avoiding horizontal displacement.

[0010] Furthermore, both the inlet manifold and the outlet manifold are fitted together on one side edge of the cooling substrate where the coolant flow channel opening is located. The opening surface of the flow distribution chamber of the inlet manifold is tightly fitted to the side surface of the cooling substrate, and the opening surface of the flow collection chamber of the outlet manifold is tightly fitted to the side surface of the cooling substrate, ensuring the sealed connection between the flow channel and the collection chamber and preventing coolant leakage.

[0011] Furthermore, the bolt mounting hole is a countersunk hole structure, with the bolt head embedded in the countersunk hole, and the top surface of the bolt head is not higher than the top surface of the cooling substrate, to prevent the bolt head from protruding and interfering with the fit with other components, and to ensure assembly compactness.

[0012] Furthermore, the annular sealing groove is arranged around the outer periphery of the coolant flow channel, the outer periphery of the sealing ring is in contact with the inner wall of the annular sealing groove, and the height of the sealing ring is greater than the depth of the annular sealing groove. When the bolt is tightened, the sealing ring is compressed, fully filling the interlayer gap and enhancing the sealing effect.

[0013] Furthermore, the coolant inlet pipe and coolant outlet pipe are both arranged perpendicular to the top surface of the inlet manifold and the outlet manifold, respectively. The coolant inlet pipe is connected to the middle region of the distribution cavity, and the coolant outlet pipe is connected to the middle region of the manifold, ensuring that the coolant is evenly distributed to each flow channel while reducing fluid resistance.

[0014] One or more technical solutions provided in this application embodiment have at least the following technical effects or advantages compared with the prior art:

[0015] A. Significantly improved heat exchange efficiency: The multi-layer cooling plate unit is stacked and arranged in a serpentine flow channel with multiple parallel branches, which greatly increases the heat exchange area and extends the heat exchange path of the coolant. At the same time, the coolant is evenly distributed through the flow distribution cavity of the inlet manifold, avoiding local overheating and effectively improving cooling efficiency to meet the heat dissipation requirements of high-power fuel cell stacks.

[0016] B. High sealing reliability: Through the cooperation of the annular sealing groove and the sealing ring, combined with the tight fit design of the manifold and the cooling base plate, a double sealing structure is formed. When the bolts are tightened, the sealing ring is compressed and fills the gap between the layers, which completely solves the problem of interlayer coolant leakage and adapts to vehicle vibration and thermal expansion conditions.

[0017] C. Precise positioning and convenient assembly: The positioning protrusions on both sides of the cooling substrate are adapted to the edge grooves of the fuel cell single cell, achieving precise positioning between layers and the battery stack, avoiding assembly misalignment; the bolt mounting holes adopt a countersunk hole structure, the bolt head does not protrude, does not interfere with the assembly of other components, and the connection method of bolts and nuts simplifies the disassembly and assembly process, improving assembly efficiency.

[0018] D. Compact structure and good adaptability: The overall structure is compact, the layout of each component is reasonable, the stacked structure of the cooling plate unit is compatible with the stacked gap of the fuel cell single cell, and the inlet and outlet pipes of the current collector are easy to connect to the vehicle's thermal management system pipeline, making it suitable for use in hydrogen fuel cell vehicles with different power levels.

[0019] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a stacked cooling plate structure for hydrogen fuel cell vehicles according to the present invention.

[0021] Figure 2 This is a bottom view of a stacked cooling plate structure for hydrogen fuel cell vehicles according to the present invention.

[0022] Figure 3 This is an exploded view of a stacked cooling plate structure for hydrogen fuel cell vehicles according to the present invention.

[0023] Figure 4 This is a partially enlarged view of a stacked cooling plate structure for hydrogen fuel cell vehicles according to this utility model.

[0024] As shown in the figure:

[0025] 1. Cooling plate unit; 2. Collector assembly; 3. Connecting and sealing assembly; 11. Cooling base plate; 12. Coolant flow channel; 21. Inlet collector block; 22. Outlet collector block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figure 1-4 As shown, a stacked cooling plate structure for hydrogen fuel cell vehicles includes a cooling plate unit 1, a current collector assembly 2, and a connecting sealing assembly 3.

[0030] In this embodiment, the cooling plate unit 1 is configured as 3 layers, with each layer of cooling plate unit 1 arranged in parallel stacks. The cooling substrate 11 of each layer of cooling plate unit 1 is a rectangular thin plate. The cooling substrate 11 has 6 parallel and spaced serpentine coolant channels 12 inside. One end of each channel converges to the inlet end of the coolant channel 12, and the other end converges to the outlet end of the coolant channel 12. Both the inlet end and the outlet end extend to the right edge of the cooling substrate 11 and form a rectangular opening. A closed annular sealing groove is formed around the outer periphery of the coolant channel 12 on the top surface of the cooling substrate 11. The four corners of the cooling substrate 11 are respectively provided with countersunk bolt mounting holes. The left and right sides of the cooling substrate 11 are integrally formed with long strip-shaped positioning protrusions extending along the length direction. The top surface of the positioning protrusion is flush with the top surface of the cooling substrate 11, and the length is the same as the length of the cooling substrate 11. The positioning protrusion is adapted to the edge groove of the adjacent fuel cell single cell.

[0031] Both the inlet manifold 21 and the outlet manifold 22 of the manifold assembly 2 are rectangular block structures adapted to the right edge of the cooling substrate 11. The left side of the inlet manifold 21 has three diversion cavities corresponding to the inlet openings of the coolant flow channels 12 in each layer, with the openings of the diversion cavities tightly fitted to the right side of the cooling substrate 11. The top of the inlet manifold 21 extends vertically upward to form a cylindrical coolant inlet pipe, which communicates with the central area of ​​the diversion cavities. The left side of the outlet manifold 22 has three confluence cavities corresponding to the outlet openings of the coolant flow channels 12 in each layer, with the openings of the confluence cavities tightly fitted to the right side of the cooling substrate 11. The top of the outlet manifold 22 extends vertically upward to form a cylindrical coolant outlet pipe, which communicates with the central area of ​​the confluence cavities.

[0032] The connecting sealing assembly 3 includes four sets of hexagon socket head cap screws and lock nuts that are adapted to the bolt mounting holes, as well as three O-rings embedded in the annular sealing grooves of each cooling substrate 11. During assembly, the lock nuts are first embedded in the annular sealing grooves of each cooling substrate 11, and then the three cooling substrates 11 are stacked vertically and aligned so that the bolt mounting holes of each layer are coaxial and the positioning protrusions are aligned. Then, the hexagon socket head cap screws are sequentially inserted into the bolt mounting holes of each cooling substrate 11, with the head of the screw embedded in the countersunk hole of the uppermost cooling substrate 11, and the top surface of the head not higher than the top surface of the cooling substrate 11. The lower end of the screw extends out of the bolt mounting hole of the lowermost cooling substrate 11 and is threadedly connected to the lock nut, thus tightening the three cooling substrates 11. At this time, the adjacent two cooling substrates 11 are sealed and fitted by the compressed lock nuts. Finally, the inlet manifold 21 and the outlet manifold 22 are respectively attached and fixed to the right edge of the cooling base plate 11, so that the flow distribution cavity is connected to the inlet opening of the coolant flow channel 12 and the flow collection cavity is connected to the outlet opening of the coolant flow channel 12.

[0033] When this utility model is in operation, the coolant enters the distribution chamber of the inlet manifold 21 through the coolant inlet pipe, and is evenly distributed to the coolant flow channels 12 of each layer of cooling substrate 11. During the flow of the coolant along the serpentine flow channel, it exchanges heat with the cooling substrate 11 and absorbs the heat generated by the fuel cell stack. After heat exchange, the coolant flows into the confluence chamber of the outlet manifold 22 through the outlet end of each layer of coolant flow channel 12, and is then discharged through the coolant outlet pipe to complete the cooling cycle.

[0034] Based on the above implementation scheme, this utility model, as a core heat dissipation component of the fuel cell stack for hydrogen fuel cell vehicles, needs to be linked with existing fuel cell cells, vehicle thermal management systems (including coolant pumps, radiators, pipelines, etc.), and assembly equipment. Its different usage scenarios and the usage status of each structure are as follows:

[0035] I. Application Scenarios for Low-Power Passenger Vehicle Fuel Cell Stacks

[0036] Existing fuel cell stacks for passenger vehicles typically consist of 20-50 stacked individual cells, each approximately 1-2 mm thick, with interlayer spacing needing to accommodate the thickness of the cooling plate. The application of this invention in this scenario is as follows:

[0037] Cooling plate unit 1: 2-3 layers of cooling plate units are stacked. The thickness of each cooling plate 11 is matched with the gap between single cell layers (about 1.5-2mm). The long strip-shaped positioning protrusions on the left and right sides of the cooling plate 11 are embedded in the pre-set grooves on the edges of adjacent single cells to achieve precise positioning of alternating stacking of "single cell-cooling plate unit-single cell". This avoids the interlayer misalignment caused by traditional non-positioning structures (the assembly misalignment rate of traditional structures is about 5-8%, while this structure can reduce it to less than 1%).

[0038] Coolant flow channel 12: A 50% ethylene glycol aqueous solution (commonly used in passenger cars) flows through a serpentine flow channel with multiple parallel branches. After the coolant flows in from the inlet, it is evenly distributed inside the cooling substrate 11 along each branch, so as to fully exchange heat with the heat generated by the single cell and solve the problem of uneven local heat exchange in traditional single-layer flow channels.

[0039] The coolant inlet pipe of the inlet manifold 21 is connected to the outlet pipe of the existing passenger vehicle thermal management system via a quick-connect coupling, and the coolant outlet pipe of the outlet manifold 22 is connected to the system return pipe via a quick-connect coupling; the distribution chamber and the inlet opening of each flow channel are fitted one-to-one to ensure that the coolant is evenly distributed to 2-3 flow channels (the flow deviation of a traditional single-layer flow channel is about 10-15%, while this structure can control it within 5%).

[0040] Connection sealing assembly 3: After the bolt passes through the countersunk bolt mounting holes of each layer of cooling substrate 11, it is tightened with the nut. The bolt head is embedded in the countersunk hole, and the top surface is not higher than the top surface of the cooling substrate 11 to avoid interference with the plates of adjacent single cells. The sealing ring in the annular sealing groove is compressed to form a sealing ring around the flow channel to prevent coolant leakage (suitable for the working pressure of 0.8-1.2MPa of existing passenger car systems).

[0041] II. Application Scenarios for High-Power Commercial Vehicle Fuel Cell Stacks

[0042] Existing commercial vehicle fuel cell stacks typically have a power output of over 100kW, consisting of 80-150 stacked individual cells. These individual cells are larger (usually ≥300mm × 300mm) and have higher heat dissipation requirements. The application of this utility model in this scenario is as follows:

[0043] Cooling plate unit 1: 4-5 layers of cooling plate units are stacked. The size of the cooling plate 11 is matched with the single battery of the commercial vehicle (e.g., 350mm×350mm). The length of the positioning protrusion is consistent with that of the cooling plate 11. After being embedded in the edge groove of the single battery, the horizontal displacement is restricted by the fit between the side of the protrusion and the inner wall of the groove (traditional non-positioning structures are prone to displacement of more than ±2mm under the vibration conditions of commercial vehicles, while this structure can control it within ±0.5mm).

[0044] Coolant flow channel 12: The number of flow channel branches is increased to 6-8 (to adapt to large-size substrates), and each branch is arranged in parallel and spaced apart to ensure that the coolant covers the entire substrate area; the opening size of the flow channel inlet and outlet is slightly larger than that of passenger car scenarios, increasing the flow rate per unit time (to meet the cooling requirements of 15-20L / min for commercial vehicles).

[0045] The flow manifold 2: The inlet flow manifold 21 and the outlet flow manifold 22 adopt a thickened design (the thickness is 20% greater than that of passenger car scenarios), and the inside of the flow distribution cavity and the flow junction cavity are reinforced with reinforcing ribs (to adapt to the higher fluid pressure of commercial vehicles); the coolant inlet pipe and the outlet pipe are connected to the system pipeline through flange joints (the connection method commonly used in existing commercial vehicles), and the inlet pipe is connected to the middle of the flow distribution cavity to ensure the flow balance of 4-5 layers of flow channels.

[0046] Connection sealing component 3: Bolts are selected with high strength grade (such as grade 8.8, while traditionally grade 6.8 is more common) and anti-loosening nuts are used (to adapt to the vibration conditions of frequent start-stop in commercial vehicles); the sealing ring adopts a structure with better temperature resistance (suitable for the coolant temperature of 80-95℃ in commercial vehicles), and the compression is increased by 10% compared with passenger car scenarios to ensure reliable interlayer sealing (can withstand 1.5-2.0MPa pressure).

[0047] III. Usage Status in Automated Production Line Assembly Scenarios

[0048] Existing automated production lines for fuel cell stacks use robots to stack and fasten individual cells to cooling plates. The linkage between this invention and the automated equipment is as follows:

[0049] The guiding function of the positioning protrusion: When the robot grasps the cooling plate unit 1, the positioning protrusion first inserts into the groove of the single battery below. The pre-positioning is achieved through the cooperation between the protrusion and the groove, replacing the traditional manual calibration step (reducing the alignment time between the single battery and the cooling plate from 3-5 seconds to 1-2 seconds).

[0050] Bolt mounting hole compatibility: The positional accuracy (±0.1mm) of the countersunk bolt mounting holes is compatible with the positioning accuracy of automated tightening robots. The robot's tightening axis can be directly aligned with the bolt mounting holes without additional adjustment. After the bolt head is embedded in the countersunk hole, the robot's clamping mechanism can directly grasp the stacked overall structure (traditional bolt heads protrude and are easily interfered with by gripping).

[0051] Pre-assembly of current collector components: The inlet current collector 21 and the outlet current collector 22 are pre-fixed to the cooling plate unit 1 by tooling in the early stage of the production line (the mating surface is coated with sealant to assist sealing). When the robot stacks the pre-assembled cooling plate unit with the single battery, the side of the current collector can be used as a visual positioning reference (the existing production line vision system can achieve a positioning accuracy of ±0.05mm through the edge of the current collector).

[0052] IV. Usage status under maintenance and replacement scenarios

[0053] When the fuel cell stack requires maintenance or the cooling plate malfunctions, the linkage between this invention and existing maintenance tools is as follows:

[0054] The removability of the connecting sealing assembly 3: the nut can be loosened and the bolt removed using an existing socket wrench, without the need for special tools; when disassembling in layers, because the engagement between the positioning protrusion and the single battery groove is a non-rigid connection, the cooling plate unit 1 can be pulled out layer by layer (traditional welded cooling plates need to be replaced as a whole, while this structure can replace the faulty layer separately, reducing maintenance costs by 30-50%).

[0055] Ease of replacing the sealing ring: The annular sealing groove has an open structure. After removing the old sealing ring, the new sealing ring can be directly inserted (compatible with existing O-ring installation tools) without disassembling the manifold assembly 2 (traditional sealing structures are mostly integrally formed with the flow channel, and replacement requires complete disassembly).

[0056] Compatibility of manifold 2: The interface dimensions (such as outer diameter and thread specification) of the coolant inlet and outlet pipes are compatible with the existing pipe fittings of commercial vehicles / passenger vehicles. No external pipe adjustment is required after replacing the cooling plate (traditional cooling plate interfaces often require pipe replacement due to model differences, increasing maintenance time).

[0057] In summary, this utility model achieves efficient linkage with existing technologies by adapting the positioning protrusion to the existing single-cell groove, using the universal interface between the current collector 2 and the existing thermal management pipeline, and ensuring compatibility between the connecting sealing component 3 and automated tools / maintenance tools. At the same time, through the design of multi-layer structure, uniform flow channel, and reliable sealing, it solves the problems of low heat dissipation efficiency, poor positioning, and sealing failure of traditional cooling plates, and adapts to the assembly and maintenance needs of hydrogen fuel cell vehicles of different power levels and different scenarios.

[0058] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A stacked cooling plate structure for hydrogen fuel cell vehicles, characterized in that, It includes a cooling plate unit (1), a collector assembly (2), and a connection sealing assembly (3); The cooling plate unit (1) has at least two layers, and each layer of cooling plate unit (1) is arranged in parallel stacks. Each layer of cooling plate unit (1) includes a rectangular thin plate-shaped cooling substrate (11). The cooling substrate (11) has multiple parallel serpentine coolant channels (12) inside. The inlet and outlet ends of the coolant channels (12) extend to the same side edge of the cooling substrate (11) and form an opening. The top surface of the cooling substrate (11) is provided with an annular sealing groove around the outer periphery of the coolant channels (12). Bolt mounting holes are provided through the four corners of the cooling substrate (11). The left and right sides of the cooling substrate (11) are integrally formed with long strip-shaped positioning protrusions. The current collection assembly (2) includes an inlet current collection block (21) and an outlet current collection block (22), both of which are rectangular block structures adapted to the edge of the cooling substrate (11). One side of the inlet current collection block (21) is provided with a flow distribution cavity that corresponds to the inlet end opening of the coolant flow channel (12) in each layer of the cooling plate unit (1). The top of the inlet current collection block (21) extends to form a coolant inlet pipe that communicates with the inside of the flow distribution cavity. One side of the outlet current collection block (22) is provided with a flow convergence cavity that corresponds to the outlet end opening of the coolant flow channel (12) in each layer of the cooling plate unit (1). The top of the outlet current collection block (22) extends to form a coolant outlet pipe that communicates with the inside of the flow convergence cavity. The connection sealing assembly (3) includes a bolt adapted to the bolt mounting hole, a nut that mates with the bolt, and a sealing ring embedded in the annular sealing groove. The bolt passes through the bolt mounting holes of each layer of cooling plate unit (1) in sequence and is threadedly connected to the nut to fasten each layer of cooling plate unit (1). The cooling plate substrates (11) of two adjacent layers of cooling plate units (1) are sealed and fitted together through the sealing ring.

2. The stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The multiple branches of the coolant flow channel (12) are arranged in parallel at intervals. One end of each branch is connected to the inlet end of the coolant flow channel (12), and the other end is connected to the outlet end of the coolant flow channel (12).

3. The stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The positioning protrusion extends along the length of the cooling substrate (11), the top surface of the positioning protrusion is flush with the top surface of the cooling substrate (11), and the length of the positioning protrusion is the same as the length of the cooling substrate (11).

4. A stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The inlet manifold (21) and the outlet manifold (22) are both fitted together on one side edge of the cooling substrate (11) where the coolant flow channel (12) is opened. The opening surface of the flow distribution cavity of the inlet manifold (21) is tightly fitted to the side surface of the cooling substrate (11), and the opening surface of the flow collection cavity of the outlet manifold (22) is tightly fitted to the side surface of the cooling substrate (11).

5. A stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The bolt mounting hole is a countersunk hole structure, with the head of the bolt embedded in the countersunk hole, and the top surface of the bolt head is not higher than the top surface of the cooling substrate (11).

6. A stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The annular sealing groove is arranged around the outer periphery of the coolant flow channel (12), the outer periphery of the sealing ring is in contact with the inner wall of the annular sealing groove, and the height of the sealing ring is greater than the depth of the annular sealing groove.

7. A stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The coolant inlet pipe and coolant outlet pipe are both set perpendicular to the top surface of the inlet manifold (21) and the outlet manifold (22), and the coolant inlet pipe is connected to the middle area of ​​the splitting cavity, and the coolant outlet pipe is connected to the middle area of ​​the manifold.

8. A stacked cooling plate structure for hydrogen fuel cell vehicles according to claim 1, characterized in that, The positioning protrusion on the cooling substrate (11) is adapted to the edge groove of the adjacent fuel cell single cell. The positioning protrusion is embedded in the groove of the adjacent fuel cell single cell to realize the positioning cooperation between the cooling plate unit (1) and the fuel cell single cell.

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