Liquid cooling heat dissipation structure, DCDC converter, fuel cell system and vehicle

Abstract

The utility model relates to a liquid cooling heat dissipation structure, DCDC converter, fuel cell system and vehicle, including shell and three-dimensional current sharing subassembly, shell includes first shell and second shell, the first shell and second shell cooperate to form the cavity that the cooling liquid passes through; the three-dimensional flow equalizing assembly is arranged in a cavity between the first shell and the second shell and comprises a flow equalizing heat conduction plate and at least one flow equalizing heat conduction column arranged on the flow equalizing heat conduction plate. According to the liquid cooling heat dissipation structure provided by the utility model, the two layers of lightweight shells and the middle three-dimensional flow equalizing assembly are welded to form a sealed high-strength liquid cooling heat dissipation device, so that heat exchange paths of heat-conducting power devices can be reduced; and through the design of the flow-equalizing heat-conducting plate and the flow-equalizing heat-conducting column in the three-dimensional flow-equalizing assembly, the contact area with the cooling liquid can be increased, and the efficient and rapid heat-conducting effect is achieved.

Description

Technical Field

[0001] This utility model relates to a liquid cooling heat dissipation structure, and more particularly to a liquid cooling heat dissipation structure, a DC-DC converter and a fuel cell system, and a vehicle. Background Technology

[0002] Currently, increasing the power output of hydrogen fuel cell systems is a major technological development direction, aiming to provide vehicles with stronger power and longer driving range. However, high-power operation generates a large current, leading to increased heat loss in power devices. In the DC-DC converter of hydrogen fuel cell systems, SiC and GaN are commonly used as the main electronic power devices; therefore, efficient heat dissipation for these devices directly affects the reliability of the entire product. Currently, the industry mostly uses die-cast water-cooled radiators to solve the heat dissipation problem. However, this solution suffers from difficulties in the die-casting process, resulting in a large radiator wall thickness, which affects the heat conduction path and reduces thermal conductivity. Utility Model Content

[0003] The present invention provides a liquid cooling heat dissipation structure to solve the problems mentioned in the background art.

[0004] To address the aforementioned issues, in one embodiment, a liquid cooling structure is provided, comprising: a housing, the housing including a first housing and a second housing, wherein the first housing and the second housing cooperate to form a cavity through which coolant passes; and a three-dimensional flow equalization assembly disposed within the cavity between the first housing and the second housing, the three-dimensional flow equalization assembly including a flow equalization heat-conducting plate and at least one flow equalization heat-conducting column disposed on the flow equalization heat-conducting plate.

[0005] The heat equalization plate has gaps with both the first and second outer shells. The heat equalization plate divides the cavity into a first receiving cavity located between the heat equalization plate and the first outer shell, and a second receiving cavity located between the heat equalization plate and the second outer shell.

[0006] The heat equalization plate includes at least one heat equalization hole penetrating the heat equalization plate, the first accommodating cavity and the second accommodating cavity are connected through the heat equalization hole, and the at least one heat equalization column is spaced apart from the heat equalization hole.

[0007] The aforementioned liquid cooling structure, by welding two lightweight outer shells to the central three-dimensional flow equalization component to form a sealed, high-strength, and efficient heat transfer and flow equalization liquid cooler, can reduce the heat exchange path of the heat-conducting power devices. The design of the flow equalization heat conduction plate and flow equalization heat conduction column in the three-dimensional flow equalization component can increase the contact area with the coolant, resulting in efficient and rapid heat conduction.

[0008] By setting up heat-conducting columns to equalize flow, the strength of the liquid cooling structure can be improved, the hydraulic deformation stress can be effectively dispersed, the casing deformation caused by excessive hydraulic pressure can be prevented from damaging the power devices, and the risk of power device failure can be reduced.

[0009] In one embodiment, the heat-conducting column has a first end and a second end opposite to each other, the first end extending into the first receiving cavity and the second end extending into the second receiving cavity.

[0010] In one embodiment, the flow-equalizing heat-conducting column is a gradually changing flow-equalizing heat-conducting column, which includes an elliptical column.

[0011] In one embodiment, the first housing includes a first set of mounting holes spaced apart along its edge, and the second housing includes a second set of mounting holes spaced apart along its edge, wherein the first set of mounting holes and the second set of mounting holes are spaced apart to enable connection between the first housing and the second housing.

[0012] In one embodiment, the liquid cooling structure further includes: a liquid inlet, which is disposed in the first housing or the second housing and communicates with the cavity; and a liquid outlet, which is disposed in the first housing or the second housing and communicates with the cavity.

[0013] In one embodiment, the first housing includes a first target edge, the second housing includes a second target edge, the first target edge and the second target edge are located on the same side, the liquid inlet is disposed on the first target edge of the first housing or the second target edge of the second housing, and the liquid outlet is disposed on the first target edge of the first housing or the second target edge of the second housing, and is spaced apart from the liquid inlet.

[0014] In one embodiment, the first and second housings are rectangular plates, and the first and second target sides are the shorter sides of the first and second housings located on the same side, respectively.

[0015] In one embodiment, the heat-conducting plate is formed with connecting ribs extending in a preset direction, the connecting ribs being used to guide the coolant to flow in the preset direction.

[0016] In one embodiment, the flow equalization heat conduction plate is square, and the connecting ribs extend along the length or width direction of the flow equalization heat conduction plate, wherein the length of the connecting ribs is less than the corresponding side length of the flow equalization heat conduction plate in its extending direction, thereby forming a gap for coolant to pass through.

[0017] In one embodiment, the three-dimensional flow equalization assembly further includes at least one connecting post disposed on the flow equalization heat conduction plate. The connecting post has a first connecting end and a second connecting end opposite each other. The first connecting end extends to the first receiving cavity and is connected to the first housing. The second connecting end extends to the second receiving cavity and is connected to the second housing. The first housing and the second housing are connected through the connecting post.

[0018] In one embodiment, the housing includes at least one connection through hole disposed on the housing, wherein the at least one connection through hole is correspondingly disposed with at least one connection post, the connection post including a connection end, the connection end of the connection post being accommodated in the connection through hole.

[0019] In one embodiment, each connecting post has a threaded hole at its connecting end, which is used to fix it to the functional device when connected to the housing and the functional device.

[0020] In one embodiment, the connecting post further includes a connecting post body portion, with a connecting end portion located at the end of the connecting post body portion. The size of the connecting post body portion is larger than the size of the connecting through hole, and the size of the connecting end portion is smaller than or equal to the size of the connecting through hole and is accommodated in the connecting through hole.

[0021] In one embodiment, the at least one connection through hole includes at least two, and the at least two connection through holes include a first set of connection through holes disposed on the first housing and a second set of connection through holes disposed on the outside of the second housing, wherein both the first set of connection through holes and the second set of connection through holes include at least one connection through hole.

[0022] On the other hand, the present invention also provides a DC-DC converter, the DC-DC converter including a liquid cooling heat dissipation structure as described in the first aspect and a main power board, the main power board being attached to the liquid cooling heat dissipation structure.

[0023] In one embodiment, the DC-DC converter further includes a cooling channel having an inlet and an outlet, the inlet of the cooling channel being connected to the liquid inlet of the liquid cooling structure, and the outlet of the cooling channel being connected to the liquid outlet of the liquid cooling structure.

[0024] On the other hand, this utility model also provides a fuel cell system, the fuel cell system including a fuel cell stack and a DC-DC converter as described in the second aspect, the DC-DC converter being connected to the fuel cell stack via a connecting copper busbar.

[0025] On the other hand, the present invention also provides a vehicle including a fuel cell system and a power system as described in the second aspect, wherein the fuel cell system is connected to the power system.

[0026] This utility model discloses a liquid cooling heat dissipation structure. By welding two lightweight outer shells to a three-dimensional flow equalization component in the middle, a liquid cooling heat dissipation structure with good sealing performance, high strength, and efficient heat transfer and flow equalization function is constructed. The lightweight outer shell greatly reduces the heat exchange path of the power devices that need to conduct heat. The flow equalization heat conduction column improves the overall strength of the liquid cooling heat dissipation structure, effectively disperses hydraulic deformation stress, and evenly transmits pressure to the entire liquid cooling heat dissipation structure. This prevents the outer shell from deforming when the hydraulic pressure is too high, thereby avoiding damage to the power devices due to the outer shell deformation, reducing the risk of power device failure, and providing a guarantee for the stable operation of the equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an overall structural diagram of the liquid cooling heat dissipation structure in some embodiments of this application.

[0029] Figure 2 This is an exploded structural diagram of the liquid cooling heat dissipation structure in some embodiments of this application.

[0030] Figure 3 This is another exploded structural diagram of the liquid cooling heat dissipation structure in some embodiments of this application.

[0031] Figure 4 This is a structural diagram of a three-dimensional flow equalization component in some embodiments of this application.

[0032] Figure 5 This is a structural diagram of the outer casing in some embodiments of the liquid cooling heat dissipation structure of this application.

[0033] Figure 6 This is a schematic diagram of the coolant flow direction in some embodiments of this application.

[0034] Figure 7 This is a perspective view of a three-dimensional flow equalization component in some embodiments of this application.

[0035] Figure 8 This is a schematic diagram of the structure of a DC-DC converter in some embodiments of this application.

[0036] Figure 9 This is an exploded structural diagram of a DC-DC converter in some embodiments of this application.

[0037] Figure 10 for Figure 9 The diagram shows a partial breakdown of the structure.

[0038] Figure 11 This is yet another schematic diagram of the DCDC converter in some embodiments of this application.

[0039] Figure 12 This is another schematic diagram of the structure of the DC-DC converter in some embodiments of this application.

[0040] Figure 13 This is a structural block diagram of a fuel cell system in some embodiments of this application.

[0041] Figure 14 This is a structural block diagram of a vehicle in some embodiments of this application.

[0042] The reference numerals in the detailed embodiments are as follows:

[0043] Liquid cooling structure 100; first outer shell 110; second outer shell 120; three-dimensional flow equalization assembly 130; first receiving cavity 140; second receiving cavity 150; liquid inlet 161; liquid outlet 162; connecting through hole 170;

[0044] First set of mounting holes 111; first target edge 112; first set of connecting through holes 113; second set of mounting holes 121; second target edge 122; second set of connecting through holes 123;

[0045] Flow equalization heat conduction plate 131; Flow equalization heat conduction column 132; Flow equalization hole 133; Connecting rib 134; Connecting column 135; Connecting end 1351; Connecting column body 1352; First side 136; Second side 137;

[0046] Fuel cell system 200; stack 210; DC-DC converter 220; cooling water channel 221; inlet 2211; outlet 2212; housing 223; first sealed connection port 2231; second sealed connection port 2232; output port 222; main output port 2221; PDU power distribution output port 2222; hydrogen circulation pump output port 2223; air compressor output port 2224; low-pressure signal control plug 224; mounting protective cover 225; vent valve 226; PDU power distribution maintenance cover 227; main power board 228; connecting copper busbar 229; hydrogen circulation pump 230; water pump 240; air compressor 250; controller 260; vehicle 300; power system 310. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0048] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] Please refer to the following: Figures 1-3 , Figure 1 This is an overall structural diagram of the liquid cooling heat dissipation structure in some embodiments of this application. Figure 2 This is an exploded structural diagram of the liquid cooling heat dissipation structure in some embodiments of this application. Figure 3 This is another exploded structural view of the liquid cooling structure in some embodiments of this application. As shown, the liquid cooling structure 100 includes a shell and a three-dimensional flow equalization assembly 130. The shell includes a first shell 110 and a second shell 120, wherein the first shell 110 and the second shell 120 cooperate to form a cavity through which coolant passes. The three-dimensional flow equalization assembly 130 is disposed in the cavity between the first shell 110 and the second shell 120. The three-dimensional flow equalization assembly 130 includes a flow equalization heat-conducting plate 131 and at least one flow equalization heat-conducting column 132 disposed on the flow equalization heat-conducting plate 131. The flow equalization heat-conducting plate 131 and the flow equalization heat-conducting column 132, together with the first shell 110 and the second shell 120, form a liquid cooling channel located in the cavity, wherein the flow equalization heat-conducting plate 131 and the flow equalization heat-conducting column 132 may be integrally formed.

[0051] Please refer to the following: Figure 4 , Figure 4 This is a structural diagram of a three-dimensional flow equalization assembly in some embodiments of this application. The flow equalization heat-conducting plate 131 includes at least one flow equalization hole 133 penetrating the flow equalization heat-conducting plate 131. The first receiving cavity 140 and the second receiving cavity 150 are connected through the at least one flow equalization hole 133, wherein the at least one flow equalization heat-conducting column 132 is spaced apart from the at least one flow equalization hole 133. Thus, the flow equalization hole 133 connects the first receiving cavity 140 and the second receiving cavity 150, allowing the coolant to circulate flexibly between the two chambers, promoting thorough mixing of the coolant, and allowing coolants of different temperatures to blend together, effectively eliminating the temperature difference between the two cavities, making the temperature distribution of the coolant more uniform throughout the entire heat dissipation system, and greatly improving the overall heat dissipation efficiency.

[0052] Thus, the cavity formed by the first outer shell 110 and the second outer shell 120 provides a stable channel for the flow of coolant. The coolant circulates within the cavity, effectively absorbing and carrying away heat. The heat-conducting plate 131 and heat-conducting column 132 in the three-dimensional flow equalization assembly 130 also increase the contact area with the coolant, ensuring that the coolant is evenly distributed throughout the cavity and preventing local overheating or uneven heat dissipation. The heat-conducting plate 131 and heat-conducting column 132 enable heat to be transferred from the heat source to the coolant more quickly and efficiently, significantly improving heat dissipation efficiency. The materials of the outer shell and the three-dimensional flow equalization assembly 130 include materials with good thermal conductivity and can be set according to actual conditions, without specific limitations here.

[0053] Furthermore, the first outer shell 110 and the second outer shell 120 are tightly integrated with the three-dimensional flow equalization component 130 to form an integral sealed structure, which can effectively prevent coolant leakage and ensure the normal operation of the heat dissipation structure. The flow equalization heat conduction column 132 can disperse the hydraulic pressure and other external forces generated by the coolant flow, improve the structural stability of the liquid cooling heat dissipation structure, and effectively prevent the outer shell from deforming under pressure, thereby reducing the risk of damage or failure of power devices due to outer shell deformation. The first outer shell 110 and the second outer shell 120 of the liquid cooling heat dissipation structure 100 are lightweight thin-walled designs, thereby reducing the heat exchange path and improving heat dissipation efficiency.

[0054] In this application, the coolant may include water, organic acid coolant, silicate coolant, ammonia coolant, etc. The type of coolant may be set according to the actual situation and is not specifically limited here.

[0055] The heat-conducting plate 131 is spaced apart from the first outer shell 110 and the second outer shell 120. The heat-conducting plate 131 divides the cavity into a first receiving cavity 140 located between the heat-conducting plate 131 and the first outer shell 110, and a second receiving cavity 150 located between the heat-conducting plate 131 and the second outer shell 120. Thus, the coolant undergoes heat exchange in the first receiving cavity 140 and the second receiving cavity 150 respectively, increasing the contact area with the coolant and the heat dissipation path, thereby improving heat dissipation efficiency. Furthermore, the evenly distributed heat-conducting columns 132 and evenly distributed flow holes 133 alter the flow path of the coolant, allowing for more thorough contact between the coolant and the evenly distributed heat-conducting plates 131 and evenly distributed heat-conducting columns 132, thereby further improving heat dissipation efficiency. By rationally setting the number, size, shape, and distribution position of the evenly distributed flow holes 133, the flow distribution ratio of the coolant between the first receiving cavity 140 and the second receiving cavity 150 can be more efficiently controlled. The flow path and flow rate of the coolant can be flexibly adjusted according to different heat dissipation requirements, enabling the coolant to achieve more efficient heat dissipation. The number, size, shape, and distribution position of the evenly distributed flow holes 133 can be set according to actual conditions and are not specifically limited here.

[0056] In some embodiments, the heat-conducting column 132 has a first end and a second end opposite to each other, the first end extending into the first receiving cavity 140 and the second end extending into the second receiving cavity 150.

[0057] In some embodiments, the first end of the heat-conducting column 132 extends to a position on the inner surface of the first housing 110 with a certain distance, or extends to a position abutting against the inner surface of the first housing 110; the second end of the heat-conducting column 132 extends to a position on the inner surface of the second housing 120 with a certain distance, or extends to a position abutting against the inner surface of the second housing 120.

[0058] In some embodiments, the first and second ends of the heat-conducting column 132 extend to positions that abut against the first housing 110 and the second housing 120 and are fixedly connected, thereby ensuring a stable and reliable heat conduction path from the heat source through the heat-conducting plate 131 and the heat-conducting column 132 to the housing. The heat-conducting column 132 is fixedly connected to the corresponding housing, forming a support between the first housing 110, the second housing 120 and the heat-conducting plate 131. When the coolant flow generates pressure or the structure is subjected to external vibration or other forces, this support can evenly distribute the force to the entire liquid cooling structure 100, thereby effectively preventing the housing from deforming due to pressure and resisting the influence of external vibration on the structure, ensuring the sealing and integrity of the structure, greatly improving the reliability and stability of the liquid cooling structure 100 under complex working conditions, and significantly extending its service life.

[0059] In addition, by setting the heat-conducting column 132, the outer shell can be supported and fixed, making the entire liquid cooling structure 100 more stable. During the flow of coolant, a certain pressure will be generated on the outer shell. The heat-conducting column 132 can evenly distribute these pressures, preventing the outer shell from deforming due to excessive local stress, ensuring the sealing and reliability of the liquid cooling structure 100, and extending its service life.

[0060] In some embodiments, please continue reading Figure 4 The heat-conducting column 132 is a gradually changing heat-conducting column, meaning that the radius of the heat-conducting column 132 gradually changes. For example, the gradually changing heat-conducting column 132 includes an elliptical column, that is, the projection of the gradually changing heat-conducting column 132 along its central axis can be elliptical, and the radius of the heat-conducting column 132 can also be the radius of the projection. In some embodiments, when the heat-conducting column 132 is an elliptical column, at least a portion of the heat-conducting column 132 has different major and minor axis directions, resulting in a more complex turbulence effect when the coolant flows through it. Here, the major axis direction refers to the direction in which the radius of the heat-conducting column 132 is longer, and the minor axis direction refers to the direction in which the radius of the heat-conducting column 132 is shorter. The elliptical cylinder alters the flow path of the coolant within the cavity. Along the major axis, the larger contact area between the coolant and the heat-conducting column 132 obstructs the flow rate, slowing it down. Along the minor axis, the increased impact force between the coolant and the heat-conducting column 132 accelerates the flow rate, thereby improving the heat exchange efficiency between the coolant, the heat-conducting column 132, and the heat-conducting plate 131. Furthermore, when the coolant impacts the elliptical cylinder, the pressure is dispersed differently along the major and minor axes, preventing excessive pressure concentration in localized areas. The unique shape of the elliptical cylinder better disperses fluid pressure during coolant flow, thus improving the stability and reliability of the entire liquid cooling structure and extending its service life.

[0061] In some embodiments, please refer to Figure 5 , Figure 5This is a structural diagram of the housing in some embodiments of this application. The first housing 110 includes a first set of mounting holes 111 spaced apart along its edge, and the second housing 120 includes a second set of mounting holes 121 spaced apart along its edge. The first set of mounting holes 111 and the second set of mounting holes 121 are correspondingly arranged to connect the first housing 110 and the second housing 120. The corresponding arrangement of the first set of mounting holes 111 and the second set of mounting holes 121 provides a precise positioning reference for the assembly of the first housing 110 and the second housing 120. During assembly, the two housings can be quickly and accurately aligned and fastened by connecting parts such as bolts and rivets passing through the corresponding mounting holes, greatly reducing the alignment time and operational difficulty during installation and improving assembly efficiency. By providing mounting holes, when the liquid cooling structure needs maintenance, repair, or component replacement, the first housing 110 and the second housing 120 can be easily separated by removing the connecting parts in the mounting holes, improving the maintainability of the equipment. The number of the first set of mounting holes 111 and the second set of mounting holes 121 can be set according to the actual situation, and no specific limit is made here.

[0062] In some embodiments, please continue reading Figure 5 The liquid cooling structure further includes a liquid inlet 161 and a liquid outlet 162. The liquid inlet 161 is disposed on the first outer shell 110 or the second outer shell 120 and communicates with the cavity. The liquid outlet 162 is disposed on the first outer shell 110 or the second outer shell 120 and communicates with the cavity. The liquid inlet 161 and the liquid outlet 162 may both be disposed on the first outer shell 110 or the second outer shell 120. In some embodiments, the liquid inlet 161 may also be disposed on the first outer shell 110 and the liquid outlet may be disposed on the second outer shell 120, or the liquid inlet 161 may be disposed on the second outer shell 120 and the liquid outlet may be disposed on the first outer shell 110.

[0063] Therefore, by rationally setting the inlet 161 and outlet 162, the flow path of the coolant in the cavity can be rationally planned according to the internal spatial layout of the equipment, the distribution of heat sources, and the coolant flow requirements. For example, in some compact equipment, the inlet 161 and outlet 162 can be set on the same housing to save space; while in large equipment or systems with high requirements for coolant circulation, the inlet 161 and outlet 162 can be set on different housings to achieve more efficient coolant circulation. This flexibility greatly improves the versatility and adaptability of the liquid cooling structure 100 in different application scenarios. The position, shape, size, and number of the inlet 161 and outlet 162 can be set according to the actual situation and are not specifically limited here.

[0064] In some embodiments, please continue reading Figure 5 The first outer shell 110 includes a first target edge 112, and the second outer shell 120 includes a second target edge 122. The first target edge 112 and the second target edge 122 are located on the same side. The liquid inlet 161 is disposed on the first target edge 112 of the first outer shell 110 or the second target edge 122 of the second outer shell 120. The liquid outlet 162 is disposed on the first target edge 112 of the first outer shell 110 or the second target edge 122 of the second outer shell 120, and is spaced apart from the liquid inlet 161. The inlet 161 and outlet 162 are both located on the first target side 112 or the second target side 122 and are distributed at intervals. This can promote the formation of a specific convection path for the coolant in the cavity. When the coolant flows in from the inlet 161, since the outlets 162 are on the same side and are distributed at intervals, the coolant needs to flow across the cavity, thereby forming a stronger convection circulation in the cavity. This increases the contact time and area between the coolant and the heat equalization plate 131, the heat equalization column 132 and the inner wall of the outer shell, thus improving the cooling efficiency.

[0065] In some embodiments, the inlet 161 and the outlet 162 are both disposed on the second housing 120. The inlet 161 is connected to the second receiving cavity 150, and the outlet 162 is connected to the second receiving cavity 150. The inlet 161 and the outlet 162 are both disposed on one side of the second target edge 122 of the second housing 120. Thus, the flow direction of the coolant in the cavity is as follows: it flows into the second receiving cavity 150 from the inlet 161, flows through the second receiving cavity 150 and then enters the first receiving cavity 140 through the flow equalization hole 133, flows through the first receiving cavity 140 and then flows back into the second receiving cavity 150 through the flow equalization hole 133, and flows out through the outlet 162.

[0066] Thus, the coolant flows back and forth between the second receiving cavity 150 and the first receiving cavity 140, extending its contact path and time with components such as the flow equalization heat conduction plate 131 and the flow equalization heat conduction column 132. This allows for multiple heat exchanges, efficiently transferring heat from the heat-generating components to the coolant, ensuring that the heat source operates within a suitable temperature range, and improving the stability of equipment performance.

[0067] In some embodiments, the inlet 161 and outlet 162 may also be located on different sides of the housing. When the coolant flow rate changes, the inlet and outlet on different sides make the flow of coolant in the cavity more stable, avoiding the problem of coolant backflow or local pressure change that may be caused by inlet and outlet on the same side, thus improving the stability of the structure. The positions of the inlet 161 and outlet 162 can be set according to the actual situation and are not specifically limited here.

[0068] In some embodiments, the first housing 110 and the second housing 120 are rectangular plates, and the first target side 112 and the second target side 122 are the shorter sides of the first housing 110 and the second housing 120 located on the same side, respectively.

[0069] Please see Figure 6 , Figure 6 This diagram illustrates the coolant flow direction in some embodiments of this application. The arrows in the diagram indicate the coolant flow direction in these embodiments; please refer to them for further details. Figure 4 In some embodiments, the heat-conducting plate 131 is formed with connecting ribs 134 extending in a preset direction, the connecting ribs 134 being used to guide the coolant to flow in the preset direction.

[0070] By setting the connecting ribs 134, the coolant can be precisely guided to flow in a preset direction, allowing the coolant to flow fully through all areas of the flow equalization heat conduction plate 131, maximizing the contact area and time between the coolant and the flow equalization heat conduction plate 131, thereby removing heat more efficiently and improving heat dissipation efficiency. The connecting ribs 134 define preset coolant flow channels, reducing the resistance of the coolant during flow, allowing the coolant to circulate more smoothly in the liquid cooling heat dissipation structure 100. Furthermore, the connecting ribs 134 can serve as a reinforcing structure for the flow equalization heat conduction plate 131, enhancing its overall rigidity and strength, making it less prone to deformation or damage when subjected to coolant pressure and various stresses during equipment operation, extending the service life of the outer shell, and ensuring the long-term stable operation of the liquid cooling heat dissipation system.

[0071] In some embodiments, the connecting rib 134 has a first connecting end and a second connecting end, the first connecting end extending into the first receiving cavity 140 and the second connecting end extending into the second receiving cavity 150.

[0072] In some embodiments, the first end of the connecting rib 134 extends to a position that may have a certain distance from the inner surface of the first housing 110, or extends to a position that abuts against the inner surface of the first housing 110; the second end of the connecting rib 134 extends to a position that may have a certain distance from the inner surface of the second housing 120, or extends to a position that abuts against the inner surface of the second housing 120.

[0073] In some embodiments, the first and second ends of the connecting rib 134 abut against and are fixedly connected to the first housing 110 and the second housing 120, respectively, which increases the connection points and connection strength between the heat-conducting plate 131 and the housing, helps to improve the stability of the entire liquid cooling heat dissipation junction 100, so that it can maintain good structural integrity when subjected to coolant pressure or external mechanical vibration, reduces the impact of structural loosening or deformation on heat dissipation performance, and extends the service life of the equipment.

[0074] In some embodiments, the first and second ends of the connecting rib 134 may also have gaps between them and the first housing 110 and the second housing 120, respectively, so as to still serve as a guide for the coolant. When the local heat of the equipment increases, the coolant can be quickly replenished to the corresponding area through the gap to enhance heat dissipation.

[0075] In some embodiments, the flow equalization heat-conducting plate 131 is square, and the connecting ribs 134 extend along the length or width of the flow equalization heat-conducting plate 131. The length of the connecting ribs 134 is less than the corresponding side length of the flow equalization heat-conducting plate 131 in its extending direction, forming a notch for the coolant to pass through. This allows for more flexible flow of the coolant on the flow equalization heat-conducting plate 131, ensuring it flows in a predetermined direction and exchanges heat with the flow equalization heat-conducting plate 131 and the flow equalization heat-conducting column 132. This guarantees that the coolant evenly covers all areas, achieving sufficient heat exchange and preventing local coolant stagnation, thus improving the uniformity and efficiency of overall heat dissipation. Furthermore, the notch prevents the coolant from encountering complete obstruction during flow, reducing flow resistance caused by sudden obstruction. The coolant can pass through the notch more smoothly, making the entire flow process more stable. The connecting ribs 134 can be integrally formed with the flow equalization heat-conducting plate 131, and the length of the connecting ribs 134 can be set according to actual conditions, without specific limitation.

[0076] In some implementations, one end of the connecting rib 134 is connected to the first side 136 of the heat-conducting plate 131 and extends toward the second side 137 opposite to the first side 136, and there is a distance between the connecting rib 134 and the second side 137 to form the notch.

[0077] In some embodiments, the first side 136 of the heat-conducting plate 131 may be a side located on the same side as the first target side 112 of the first housing 110 and the second target side 122 of the second housing 120. Thus, coolant entering from the inlet 161 located on the first target side 112 or the second target side 122 flows towards the other side under the guidance of the connecting rib 134, and after passing through the notch, flows back to the outlet 162 located on the first target side 112 or the second target side 122, and flows out through the outlet 162, thereby effectively increasing the length of the coolant's flow path and improving the heat dissipation effect.

[0078] In some embodiments, when both the inlet 161 and the outlet 162 are located on the second housing 120, and both the inlet 161 and the outlet 162 are located on one side of the second target edge 122 of the second housing 120, the flow direction of the coolant is as follows: the coolant flows into the second receiving cavity 150 from the inlet 161, and under the guidance of the connecting rib 134, it first flows in the second receiving cavity 150 in a direction away from the outlet 162, fully absorbing the heat in the second receiving cavity 150; then, the coolant enters the first receiving cavity 140 through the flow equalization hole 133, and in the first receiving cavity 140, the coolant continues to flow in the preset direction under the guidance of the connecting rib 134, further absorbing the heat in the first receiving cavity 140; afterwards, the coolant flows back to the second receiving cavity 150 through the flow equalization hole 133, flows in the second receiving cavity 150 along a path close to the outlet 162, and finally flows out through the outlet 162.

[0079] Thus, in the above embodiments, the flow path of the coolant in the cavity is significantly increased, allowing it to fully contact the heat equalization plate 131 and the heat equalization column 132. Moreover, during the flow of the coolant in different areas, it can continuously remove heat from each area, achieving all-round and high-efficiency heat dissipation. This further improves the heat dissipation performance of the entire liquid cooling structure 100 against the heat source, ensuring that the equipment can maintain a low and stable temperature during operation, providing a solid guarantee for the stable operation and efficient work of the equipment.

[0080] In some embodiments, the flow equalization heat conduction plate 131 is also rectangular. When the first target side 112 and the second target side 122 are the short sides of the first outer shell 110 and the second outer shell 120 located on the same side, the first side 136 and the second side 137 are also the short sides of the flow equalization heat conduction plate 131. The connecting rib 134 extends along the length direction of the flow equalization heat conduction plate 131, which can further effectively increase the length of the flow path and improve the heat dissipation effect.

[0081] In some embodiments, please refer to Figure 4 The three-dimensional flow equalization assembly 130 further includes at least one connecting post 135 disposed on the flow equalization heat conduction plate 131. The connecting post 135 has a first connecting end and a second connecting end opposite to each other. The first connecting end extends to the first receiving cavity 140 and is connected to the first outer shell 110. The second connecting end extends to the second receiving cavity 150 and is connected to the second outer shell 120. The first outer shell 110 and the second outer shell 120 are connected by the connecting post 135.

[0082] In one embodiment, please refer to Figure 1The housing includes at least one connection through hole 170 disposed on the housing, wherein the at least one connection through hole 170 is correspondingly disposed with the at least one connection post 135.

[0083] Please refer to the following: Figure 7 , Figure 7 This is a perspective view of a three-dimensional flow equalization component in some embodiments of this application. The connecting post 135 includes a connecting end 1351, which is accommodated in the connecting through hole 170.

[0084] In some embodiments, each connecting post 135 has a threaded hole at its connecting end 1351, which is used to fix the housing to the functional device when the housing is connected to the functional device.

[0085] Therefore, the connecting post 135 is correspondingly set with the connecting through hole 170 on the outer shell, which can accurately position the relative position of the three-dimensional flow equalization component 130 and the outer shell during installation, ensuring the accuracy of the coolant flow channel. The connecting end 1351 of the connecting post 135 is accommodated in the connecting through hole 170, which increases the contact area between the two, making the connection between the three-dimensional flow equalization component 130 and the outer shell more stable. It can also maintain a good connection state under the pressure generated by the coolant flow and the vibration environment of the equipment operation, ensuring the stable operation of the heat dissipation system. The threaded hole provided in the connecting end 1351 can be used with bolts or other connecting parts to quickly fix the outer shell and functional devices (such as heat-generating electronic chips) together to form a compact heat dissipation unit, thereby reducing the heat dissipation path.

[0086] The threaded hole facilitates later maintenance and replacement. When a functional component malfunctions, it can be easily disassembled for repair or replacement. Through the cooperation of the connecting post 135 and the connecting through hole 170, as well as the threaded hole, a tight integrated structure is formed between the three-dimensional flow equalization component 130, the housing, and the functional components. This improves the mechanical strength of the heat dissipation system and enables better heat transfer. The heat generated by the functional components can be quickly conducted to the housing through the connecting post 135 and then carried away by the coolant, thus improving the heat dissipation efficiency and effect.

[0087] In some embodiments, please continue reading Figure 7The connecting post 135 further includes a connecting post body 1352, and a connecting end 1351 located at the end of the connecting post body 1352. The size of the connecting post body 1352 is larger than the size of the connecting through hole 170, and the size of the connecting end 1351 is smaller than or equal to the size of the connecting through hole 170 and is accommodated in the connecting through hole 170. Thus, the connecting post body 1352 and the connecting end 1351 form a boss-like structure. During the insertion of the connecting post 135 into the connecting through hole 170, after the connecting end 1351 is inserted, the connecting post body 1352 prevents the connecting post 135 from going further in, avoiding excessive insertion of the three-dimensional flow equalization assembly 130 into the outer shell. This ensures the accuracy of the relative position between the three-dimensional flow equalization assembly 130 and the outer shell, playing a certain limiting role, and further improving the stability of the connection between the three-dimensional flow equalization assembly 130 and the outer shell, ensuring the reliability of the entire liquid cooling heat dissipation structure 100.

[0088] In some embodiments, please refer to Figure 5 The connection through hole 170 includes a first set of connection through holes 113 disposed in the first housing 110 and a second set of connection through holes 123 disposed in the second housing 120.

[0089] The first and second connecting ends of the connecting post 135 are respectively engaged with the first set of connecting through holes 113 and the second set of connecting through holes 123 in the first receiving cavity 140 and the second receiving cavity 150, making the connection between the three-dimensional flow equalization component 130 and the outer shell more uniform and stable. This can more effectively disperse the pressure from the coolant flow inside the outer shell and the external mechanical force, preventing the connection from loosening or the structure from deforming due to excessive local stress, ensuring the stability and reliability of the entire liquid cooling heat dissipation structure 100, and extending its service life.

[0090] During installation, the three-dimensional flow equalization assembly 130 can be accurately installed on the housing by aligning the first connecting end of the connecting post 135 with the first set of connecting through holes 113 and the second connecting end with the second set of connecting through holes 123, thereby improving installation accuracy. The connecting posts 135 are grouped and arranged in different accommodating cavities, which reduces interference with the flow of coolant in each cavity and helps maintain the normal flow state of coolant in the first accommodating cavity 140 and the second accommodating cavity 150. This ensures that the coolant can fully exchange heat with the flow equalization heat conduction plate 131 and the flow equalization heat conduction post 132, thereby optimizing the heat dissipation performance of the entire liquid cooling heat dissipation structure 100, improving heat dissipation efficiency, and better meeting the heat dissipation requirements of the equipment.

[0091] Please refer to the following: Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of a DC-DC converter in some embodiments of this application. Figure 9 This is an exploded structural diagram of a DC-DC converter in some embodiments of this application. The DC-DC converter 220 includes a main power board 228 and a liquid cooling structure 100 as described in any of the foregoing embodiments, wherein the main power board 228 is attached to the liquid cooling structure 100.

[0092] The main power board 228 generates a large amount of heat during the power conversion process. By directly attaching it to the liquid cooling structure 100, the heat transfer path and thermal resistance can be minimized, allowing the heat to be quickly and efficiently conducted to the liquid cooling structure 100. Furthermore, the close integration of the main power board 228 with the liquid cooling structure 100 reduces additional heat dissipation components and space occupation, which helps to achieve the miniaturization and weight reduction of the DC-DC converter 220.

[0093] Please refer to the following: Figure 10 , Figure 10 for Figure 9 The diagram shows a partially exploded structural schematic. In some embodiments, the DC-DC converter 220 further includes a first sealed connection port 2231 and a second sealed connection port 2232, wherein the liquid inlet 161 of the liquid cooling structure 100 is sealed to the first sealed connection port 2231, and the liquid outlet 162 is sealed to the second sealed connection port 2232.

[0094] When the liquid inlet 161 is connected to the first sealing connection port 2231, an annular sealing ring is provided between their mating surfaces. A groove is machined around the edge of the first sealing connection port 2231, and the annular sealing ring is tightly embedded in the groove. When the liquid inlet 161 and the first sealing connection port 2231 are mated, the liquid inlet 161 and the first sealing connection port 2231 are tightly fitted by bolt tightening. The annular sealing ring undergoes elastic deformation under compression, thereby filling the tiny gap between the connecting surfaces, achieving a reliable sealing effect, and ensuring that the coolant will not leak from the connection.

[0095] Similarly, the connection between the outlet 162 and the second sealing connection 2232 adopts the same connection structure as that between the inlet 161 and the first sealing connection 2231. A groove is provided on the edge of the second sealing connection 2232, and a matching sealing ring is installed therein. When the outlet 162 and the second sealing connection 2232 are assembled, they are tightly joined by bolts. The sealing ring deforms under pressure, tightly fitting the connection surface, effectively preventing coolant leakage and ensuring that the coolant flows out along the predetermined path.

[0096] The material of the sealing ring may include sealing materials with good sealing properties such as rubber and sealant. The material of the sealing ring can be set according to the actual situation and is not specifically limited here.

[0097] The fixed connection method between the liquid inlet 161 and the first sealing connection port 2231 and the liquid outlet 162 and the second sealing connection port 2232 can be set according to the actual situation. For example, they can be fixedly connected by riveting, welding, bonding and interference fit, etc., and no specific limitation is made here.

[0098] Please refer to the following: Figure 11 and Figure 12 , Figure 11 This is yet another schematic diagram of the DC-DC converter in some embodiments of this application. Figure 12 This is another structural schematic diagram of a DC-DC converter in some embodiments of this application. In some embodiments, the DC-DC converter 220 further includes a housing 223 and a cooling water channel 221. The cooling water channel includes an inlet 2211 and an outlet 2212 disposed in the housing 223. The two ends of the inlet 2211 are respectively located inside and outside the housing 223. One end of the inlet 2211 located inside the DC-DC converter 220 is connected to the liquid inlet 161 of the liquid cooling structure 100. The two ends of the outlet 2212 are also respectively located inside and outside the housing 223. One end of the outlet 2212 located inside the DC-DC converter 220 is connected to the liquid outlet 162 of the liquid cooling structure 100, thereby forming a complete coolant circulation channel.

[0099] The coolant flows in from the inlet 2211, absorbs the heat generated by the DC-DC converter 220 during operation through the liquid cooling structure 100, and then flows out from the outlet 2212. This efficiently removes heat, ensuring the stable operation of the DC-DC converter 220, effectively reducing its operating temperature, preventing performance degradation or malfunction due to overheating, and extending the equipment's service life. At the same time, it facilitates connection and maintenance with external cooling equipment, enhancing the equipment's practicality and versatility.

[0100] Please refer to the following: Figure 13 , Figure 13 This is a structural block diagram of a fuel cell system according to some embodiments of this application. In some embodiments, the fuel cell system 200 includes a fuel cell stack 210 and a DC-DC converter 220 as described in any of the foregoing embodiments, wherein the DC-DC converter 220 is connected to the fuel cell stack 210 via a connecting copper busbar 229.

[0101] The fuel cell system 200 further includes a hydrogen circulation pump 230, a water pump 240, an air compressor 250, and a controller 260. The water pump 240 is used to drive the coolant to circulate in the heat dissipation circuit, ensuring that the coolant can continuously flow into the liquid-cooled heat dissipation structure 100 through the cooling water channel. The air compressor 250 is used to compress the air entering the fuel cell stack 210, increasing the air pressure and density. The hydrogen circulation pump 230 is used to circulate unreacted hydrogen from the fuel cell stack 210 back to the inlet to improve the utilization rate of hydrogen and maintain the hydrogen pressure balance within the fuel cell stack 210. The controller 260 is used to monitor the operating parameters (such as voltage and pressure) of each component of the fuel cell system 200, and accordingly regulate the coordinated operation of components such as the fuel cell stack 210, DC-DC converter 220, hydrogen circulation pump 230, water pump 240, and air compressor 250 to achieve dynamic power matching and abnormal operating condition protection, ensuring the efficient and safe operation of the system.

[0102] The DC-DC converter 220 is connected to the fuel cell stack 210 via the connecting copper busbar 229. The connecting copper busbar 229, with its good conductivity and low resistance, enables low-loss transmission between the DC-DC converter 220 and the fuel cell stack 210, reducing energy loss during transmission and improving the energy utilization efficiency of the fuel cell system 200. At the same time, the connecting copper busbar 229 also ensures the reliability of the electrical connection between the DC-DC converter 220 and the fuel cell stack 210, avoiding safety hazards such as overheating and arcing caused by poor connection, and ensuring the safe operation of the system.

[0103] In some embodiments, the input copper busbar of the connecting copper busbar 229 of the DC-DC converter 220 and the output copper busbar of the fuel cell stack 210 are connected for power transmission.

[0104] In some embodiments, please continue reading Figure 11 The DC-DC converter 220 further includes at least one output port 222, which is used to connect to an external device to realize information interaction and / or power transmission between the DC-DC converter 220 and the external device. The at least one output port 222 includes at least one of a main output port 2221, a PDU power distribution output port 2222, a hydrogen circulation pump output port 2223, and an air compressor output port 2224.

[0105] The main output port 2221 is used to output converted DC power to provide power to the fuel cell system 200, thereby ensuring that the fuel cell system 200 can start normally and operate continuously. The PDU power distribution output port 2222 is used to stably distribute electrical energy to each device of the fuel cell system 200 to ensure stable power supply to each power branch, avoid equipment failure or performance fluctuations caused by uneven or unstable power supply, and greatly improve the stability and reliability of the entire fuel cell system 200. The hydrogen circulation pump output port 2223 is used to provide suitable electrical energy to the hydrogen circulation pump 230, and its output power is adjusted by the controller 260 to match the hydrogen circulation volume with the reaction requirements of the fuel cell stack 210. The air compressor output port 2224 is used to provide suitable electrical energy to the air compressor 250, and its output power is adjusted by the controller 260 to ensure that the air supply matches the reaction requirements of the fuel cell stack and extend the service life of the fuel cell stack 210.

[0106] Therefore, by independently setting the output ports 222 with different functions, the connection between the DC-DC converter 220 and other components of external devices becomes clearer and more standardized, which facilitates modular integration during system assembly, reduces the difficulty and cost of system integration, and improves production efficiency.

[0107] In some embodiments, please continue reading Figure 12 The DC-DC converter 220 also includes at least a low-voltage signal control plug 224, a mounting cover 225, a vent valve 226, a PDU power distribution maintenance cover 227, and a connecting copper busbar 229 disposed in the housing 223.

[0108] The low-voltage signal control plug-in 224 is used to connect with the fuel cell system 200 and transmit control signals. Through the low-voltage signal control plug-in 224, it is possible to connect with external devices and transmit control signals, enabling operators to accurately control the operating status of the DC-DC converter 220 and ensure that it can work stably and efficiently. In some embodiments, the low-voltage signal control plug-in 224 may specifically be connected to the low-voltage control circuit of the fuel cell system 200.

[0109] The DC-DC converter 220 also includes a mounting hole for connection with the fuel cell stack 210. The mounting cover 225 is used to cover the mounting hole when the DC-DC converter 220 is not connected to the fuel cell stack 210, so as to protect the connection part of the DC-DC converter 220 with external equipment, prevent the connection from loosening, short circuit and other faults caused by collision, foreign object intrusion, etc., ensure stable and reliable power transmission, maintain the normal operation of the equipment, and at the same time, the mounting cover 225 can also reduce the corrosion of the connection part by external environmental factors, reduce the aging and damage rate of components, extend the service life of the DC-DC converter 220, and reduce maintenance costs.

[0110] The vent valve 226 is used to balance the internal and external air pressure of the DC-DC converter 220, preventing problems such as deformation of the housing 223 and failure of the seal caused by excessively high or low internal air pressure, ensuring the structural integrity and sealing of the equipment, reducing the probability of failure. At the same time, a stable air pressure environment helps the normal operation of the internal components, avoiding the impact of abnormal air pressure on heat dissipation, electrical performance, etc., so that the performance of the DC-DC converter 220 remains stable.

[0111] The PDU power distribution maintenance cover 227 is used for maintenance of the PDU power distribution section, allowing technicians to quickly open it to inspect, repair, and replace parts, shortening maintenance time, improving equipment maintenance efficiency, and reducing equipment downtime. At the same time, it provides targeted protection and opening for the PDU power distribution area, avoiding unnecessary interference or damage to other components during maintenance, and reducing the difficulty and risk of maintenance operations.

[0112] Please see Figure 14 , Figure 14 This is a structural block diagram of a vehicle according to some embodiments of this application. In some embodiments, the vehicle 300 includes a fuel cell system 200 and a power system 310 as described in any of the foregoing embodiments. The fuel cell system 200 outputs stable electrical energy, providing a continuous and reliable power source for the power system 310, enabling the vehicle 300 to start smoothly, accelerate rapidly, and maintain power output without significant attenuation during operation, thus meeting driving requirements under different working conditions. At the same time, the liquid cooling structure 100 ensures the stable operation of the fuel cell system 200, maintaining a suitable operating temperature even under long-term high-load conditions, avoiding performance degradation due to overheating, significantly improving the stability and reliability of the vehicle 300, extending the service life of key components, and reducing maintenance frequency and costs.

[0113] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be found in the relevant descriptions of other embodiments. The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. Furthermore, for those skilled in the art, based on the ideas of this application, there will be changes in specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the protection scope of the technical solution.

Claims

1. A liquid-cooled heat dissipation structure, characterized in that, include: The housing includes a first housing and a second housing, wherein the first housing and the second housing cooperate to form a cavity through which coolant passes; A three-dimensional flow equalization assembly is disposed in the cavity, and the three-dimensional flow equalization assembly includes a flow equalization heat conduction plate and at least one flow equalization heat conduction column disposed on the flow equalization heat conduction plate. The heat-conducting plate has gaps with both the first and second outer shells, and divides the cavity into a first receiving cavity located between the heat-conducting plate and the first outer shell, and a second receiving cavity located between the heat-conducting plate and the second outer shell. The heat-conducting plate includes at least one heat-conducting hole penetrating the heat-conducting plate, the first accommodating cavity and the second accommodating cavity are connected through the heat-conducting hole, and the heat-conducting column is spaced apart from the heat-conducting hole.

2. The liquid cooling heat dissipation structure according to claim 1, characterized in that, The heat-conducting column for equal flow has a first end and a second end, the first end extending into the first receiving cavity and the second end extending into the second receiving cavity.

3. The liquid cooling heat dissipation structure according to claim 1, characterized in that, Also includes: A liquid inlet is provided in the first outer shell or the second outer shell and communicates with the cavity; The liquid outlet is located in the first or second outer shell and communicates with the cavity.

4. The liquid cooling heat dissipation structure according to claim 3, characterized in that, Both the liquid inlet and the liquid outlet are located in the second outer shell. The liquid inlet is connected to the second receiving cavity, and the liquid outlet is connected to the second receiving cavity.

5. The liquid cooling heat dissipation structure according to claim 1, characterized in that, The heat-conducting plate with uniform flow has connecting ribs extending in a preset direction, which are used to guide the coolant to flow in the preset direction.

6. The liquid cooling heat dissipation structure according to claim 1, characterized in that, The three-dimensional flow equalization assembly further includes at least one connecting post disposed on the flow equalization heat conduction plate. The connecting post has a first connecting end and a second connecting end opposite to each other. The first connecting end extends to the first receiving cavity and is connected to the first outer shell. The second connecting end extends to the second receiving cavity and is connected to the second outer shell. The first outer shell and the second outer shell are connected through the connecting post.

7. A DC-DC converter, characterized in that, It includes a main power board and a liquid cooling structure as described in any one of claims 1-6, wherein the main power board is attached to the liquid cooling structure.

8. The DC-DC converter according to claim 7, characterized in that, The DC-DC converter also includes a cooling channel with an inlet and an outlet. The inlet of the cooling channel is connected to the liquid inlet of the liquid cooling structure, and the outlet of the cooling channel is connected to the liquid outlet of the liquid cooling structure.

9. A fuel cell system, characterized in that, It includes a fuel cell stack and a DC-DC converter as described in claim 7 or 8, wherein the DC-DC converter is connected to the fuel cell stack via a connecting copper busbar.

10. A vehicle, characterized in that, It includes the fuel cell system and power system as described in claim 9, wherein the fuel cell system is connected to the power system.

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