A heat dissipation structure and charging system for an oil-immersed power module

Abstract

This application discloses a heat dissipation structure and charging system for an oil-immersed power module, belonging to the field of charging technology. The power module is fully immersed in oil. The heat dissipation structure includes a housing and a heat dissipation component. The housing has an inlet and an outlet connected to an external cooling oil circulation pipeline. The heat dissipation component is located on the outside of the housing and is used to dissipate heat from the power module. The heat dissipation component includes multiple heat dissipation teeth, with the inlet and outlet extending perpendicular to these teeth. This invention solves the problem of poor heat dissipation in traditional aluminum housings under high load operation.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a heat dissipation structure and charging system for an oil-immersed power module. Background Technology

[0002] Due to the unique operating conditions of oil-immersed power modules, all internal components and devices on the PCB are completely submerged in mineral oil. Therefore, these modules require a high protection rating, needing to achieve IP68 protection. Oil-immersed power modules cannot use the direct airflow or exhaust vents found in traditional air-cooled modules. While traditional aluminum housings possess good thermal conductivity, their heat dissipation capacity often becomes a key factor limiting the module's power output under high load conditions. Utility Model Content

[0003] The main purpose of this application is to provide a heat dissipation structure and charging system for an oil-immersed power module, which aims to solve the problem of poor heat dissipation performance of traditional aluminum casings under high load operation.

[0004] To achieve the above objectives, this application provides a heat dissipation structure for an oil-immersed power module, wherein the power module is fully immersed in oil. The heat dissipation structure includes a housing and a heat dissipation component. The housing is provided with an inlet and an outlet, which are connected to an external cooling oil circulation pipeline. The heat dissipation component is disposed on the outside of the housing and is used to dissipate heat from the power module. The heat dissipation component includes multiple heat dissipation teeth, and the extending directions of the inlet and outlet are perpendicular to the multiple heat dissipation teeth.

[0005] Optionally, the plurality of heat dissipation teeth include: a plurality of first heat dissipation teeth and / or a plurality of second heat dissipation teeth, wherein the plurality of first heat dissipation teeth are fixed to one side of the outer surface of the housing; and the plurality of second heat dissipation teeth are fixed to the other side of the outer surface of the housing.

[0006] Optionally, each of the first heat dissipation teeth is uniformly arranged on one side of the casing, and the ratio of the tooth height of the first heat dissipation tooth to the tooth spacing of the first heat dissipation tooth is a, and 0.7 < a < 1; and / or, each of the second heat dissipation teeth is uniformly arranged on the other side of the casing, and the ratio of the tooth height of the second heat dissipation tooth to the tooth spacing of the second heat dissipation tooth is b, and 0.7 < b < 1.

[0007] Optionally, the side of the box interior closest to the liquid inlet is a low-temperature region, and the side of the box interior closest to the liquid outlet is a high-temperature region. The distribution density of the first heat dissipation teeth in the high-temperature region is greater than that in the low-temperature region; and / or, the distribution density of the second heat dissipation teeth in the high-temperature region is greater than that in the low-temperature region.

[0008] Optionally, the end of the first heat dissipation tooth has an uneven structure; and / or, the end of the second heat dissipation tooth has an uneven structure.

[0009] Optionally, the side of the box interior near the liquid inlet is a low-temperature region, and the side of the box interior near the liquid outlet is a high-temperature region; the tooth height of the first heat dissipation tooth located in the low-temperature region is lower than the tooth height of the first heat dissipation tooth located in the high-temperature region; and / or, the tooth height of the second heat dissipation tooth located in the low-temperature region is lower than the tooth height of the second heat dissipation tooth located in the high-temperature region.

[0010] Optionally, the ratio of the tooth height of the first heat dissipation tooth located in the low-temperature region to the tooth height of the first heat dissipation tooth located in the high-temperature region is c, and 0.5 < c < 1; and / or, the ratio of the tooth height of the second heat dissipation tooth located in the low-temperature region to the tooth height of the second heat dissipation tooth located in the high-temperature region is d, and 0.5 < d < 1.

[0011] Optionally, each of the first heat dissipation teeth has a first through hole along its thickness direction; and / or, each of the second heat dissipation teeth has a second through hole along its thickness direction.

[0012] Furthermore, to achieve the above objectives, this application also provides a charging system, including at least two power modules, a controller, a power distribution device, and at least one charging interface, wherein the power distribution device is connected to the controller, each of the power modules, and each of the charging interfaces respectively; the power modules are used to convert AC power from the power grid into DC power and provide it to the charging interfaces, and the power modules include the heat dissipation structure described in any of the above possible implementations; the controller is used to obtain the power demand of each of the charging interfaces and generate a scheduling command based on the connection relationship of the controllable switches in the power distribution device and the power demand; the power distribution device is used to control the opening or closing of the controllable switches according to the scheduling command, so as to distribute the output power of each of the power modules to each of the charging interfaces.

[0013] Optionally, the charging system is an integrated DC charging pile, the charging interface is used to connect the charging gun, and the charging gun is hung on the host of the charging system through the gun holder on the main body of the charging system.

[0014] The modular heat dissipation structure proposed in this application provides a heat dissipation component on the outside of the housing. When the cooling oil enters the housing from the inlet, it exchanges heat with the components inside the housing, thereby raising the temperature of the cooling oil. The heated cooling oil is discharged from the outlet. During the flow of the cooling oil in the housing, some of the heat generated is dissipated through the heat dissipation component, which to a certain extent solves the problem of poor heat dissipation effect of traditional aluminum housings under high load operation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a module heat dissipation structure provided in an embodiment of this application;

[0016] Figure 2 for Figure 1 A structural diagram from another perspective;

[0017] Figure 3 for Figure 1 A structural diagram from another perspective;

[0018] Figure 4 A three-dimensional structural diagram of a module heat dissipation structure provided in another embodiment of this application;

[0019] Figure 5 A three-dimensional structural diagram of a module heat dissipation structure provided in another embodiment of this application;

[0020] Figure 6 A three-dimensional structural diagram of a module heat dissipation structure provided in another embodiment of this application;

[0021] Figure 7 for Figure 6 A structural diagram from another perspective;

[0022] Figure 8 This is a block diagram of a charging system provided in an embodiment of this application.

[0023] In the figure, 1 is the housing; 101 is the liquid inlet; 102 is the liquid outlet; 2 is the heat dissipation component; 3 is the heat dissipation tooth; 301 is the first heat dissipation tooth; 302 is the second heat dissipation tooth; 303 is the first through hole; 304 is the second through hole; 110 is the power module; 120 is the charging interface; 130 is the controller; and 140 is the power distribution device.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] 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.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Please see Figures 1 to 7 This application provides a heat dissipation structure for an oil-immersed power module, in which the power module is fully submerged in oil. The heat dissipation structure may include: a housing 1 and a heat dissipation component 2. The housing 1 is provided with an inlet 101 and an outlet 102, which are connected to an external cooling oil circulation pipeline. The heat dissipation component 2 is disposed on the outside of the housing 1 and is used to dissipate heat from the power module. The heat dissipation component 2 includes a plurality of heat dissipation teeth 3, and the extension direction of the inlet 101 and the outlet 102 is perpendicular to the plurality of heat dissipation teeth 3.

[0030] In this embodiment, by setting a heat dissipation component 2 on the outside of the housing 1, when the cooling oil enters the housing 1 from the inlet 101, it exchanges heat with the components inside the housing 1, thereby raising the temperature of the cooling oil. The heated cooling oil is discharged from the outlet 102. During the flow of the cooling oil in the housing 1, some of the heat generated is dissipated through the heat dissipation component 2, which to a certain extent solves the problem of poor heat dissipation effect of traditional aluminum housings when operating under high load.

[0031] The heat dissipation component 2 is configured with multiple heat dissipation fins 3, which increases the heat dissipation area and improves heat dissipation efficiency by increasing the surface area in contact with air. Furthermore, the heat dissipation fins 3 can be distributed on opposite sides of the housing 1, ensuring uniform heat dissipation and preventing localized overheating. Compared to traditional aluminum housing designs, the average temperature of internal components decreases by 2°C to 3°C. Additionally, the extension directions of the liquid inlet 101 and liquid outlet 102 are perpendicular to the multiple heat dissipation fins 3, further enhancing their heat dissipation effect.

[0032] The placement of the heat dissipation fins 3 ensures both good thermal conductivity and sufficient mechanical strength, effectively preventing deformation or damage to the housing 1 during use. In designing the heat dissipation structure, appropriate gaps are maintained between the multiple heat dissipation fins 3 to promote airflow and enhance the effects of natural or forced convection.

[0033] It should be noted that initially, the cooling oil circulation system is in standby mode, and the temperature of the cooling oil inside the enclosure 1 is close to the ambient temperature. At this time, the heat dissipation component 2 is not required. When the components inside the enclosure 1 begin to operate and generate heat, this heat is transferred to the cooling oil inside the enclosure 1, causing the oil temperature to rise. Low-temperature cooling oil enters the enclosure 1 from the external cooling oil circulation pipe through the inlet 101, replacing the heated cooling oil. Over time, the high-temperature cooling oil inside the enclosure 1 is returned to the external cooling oil circulation pipe through the outlet 102, where it is cooled by the cooling device. The cooled oil then continues to enter the enclosure 1 through the inlet 101. This cycle continues, completing the cooling of the components inside the enclosure 1.

[0034] Please see Figure 3 The plurality of heat dissipation teeth 3 may include: a plurality of first heat dissipation teeth 301, wherein the plurality of first heat dissipation teeth 301 are fixed to one side outside the housing 1; and / or, a plurality of second heat dissipation teeth 302, wherein the plurality of second heat dissipation teeth 302 are fixed to the other side outside the housing 1.

[0035] In this embodiment, there are three specific technical solutions. The first technical solution is: the multiple heat dissipation teeth 3 include multiple first heat dissipation teeth 301 and are fixed to one side outside the housing 1; the second technical solution is: the multiple heat dissipation teeth 3 include multiple second heat dissipation teeth 302 and are fixed to one side outside the housing 1; the third technical solution is: the multiple heat dissipation teeth 3 include multiple first heat dissipation teeth 301 and multiple second heat dissipation teeth 302, the first heat dissipation teeth 301 are disposed on one side outside the housing 1, and the second heat dissipation teeth 302 are disposed on the other side outside the housing 1.

[0036] Specifically, in a preferred embodiment of this application, the heat dissipation fins 3 are configured as multiple first heat dissipation fins 301 and multiple second heat dissipation fins 302. This configuration increases the heat dissipation area of ​​the housing 1, and the multiple first heat dissipation fins 301 and multiple second heat dissipation fins 302 dissipate heat into the environment through contact with the air. Simultaneously, the arrangement of multiple first heat dissipation fins 301 and multiple second heat dissipation fins 302 ensures that heat does not concentrate in a single part of the housing 1, but is evenly distributed on both sides of the housing 1. This symmetrical arrangement improves the stability and aesthetics of the system.

[0037] Please see Figure 3 Each of the first heat dissipation teeth 301 is uniformly arranged on one side outside the housing 1, and the ratio of the tooth height of the first heat dissipation tooth 301 to the tooth spacing of the first heat dissipation tooth 301 is a, and 0.7 < a < 1; and / or, each of the second heat dissipation teeth 302 is uniformly arranged on the other side outside the housing 1; the ratio of the tooth height of the second heat dissipation tooth 302 to the tooth spacing of the second heat dissipation tooth 302 is b, and 0.7 < b < 1.

[0038] In this embodiment, the ratio of the tooth height to the tooth spacing of the first heat dissipation tooth 301 is 0.7 to 1; or the ratio of the tooth height to the tooth spacing of the second heat dissipation tooth 302 is 0.7 to 1; or the ratio of the tooth height to the tooth spacing of both the first heat dissipation tooth 301 and the second heat dissipation tooth 302 is 0.7 to 1.

[0039] Specifically, the ratio of the tooth height to the tooth pitch of the first heat dissipation tooth 301 can be 0.8, 0.9, etc.; similarly, the ratio of the tooth height to the tooth pitch of the second heat dissipation tooth 302 can be 0.8, 0.9, etc. Preferably, the tooth height of the first heat dissipation tooth 301 can be 15mm, and the tooth pitch of the first heat dissipation tooth 301 can be 19mm; the tooth height of the second heat dissipation tooth 302 can be 15mm, and the tooth pitch of the second heat dissipation tooth 302 can be 19mm. Of course, these tooth heights and tooth pitches can be other data, as long as the above-mentioned ratio of tooth height to tooth pitch is satisfied.

[0040] The ratio of the tooth height to the tooth pitch of the first heat dissipation tooth 301 is set to 0.7–1, and the ratio of the tooth height to the tooth pitch of the second heat dissipation tooth 302 is also set to 0.7–1. This ratio is an optimized result that achieves a balance between heat dissipation efficiency and airflow. For example, if the tooth height is too high (a or b is close to 1), although the heat dissipation area increases, the small tooth pitch may obstruct airflow, ultimately affecting the heat dissipation effect. If the tooth height is too low (a or b is close to 0.7), although the airflow is good, the heat dissipation area is insufficient, thus failing to effectively dissipate heat, preventing the first heat dissipation tooth 301 and the second heat dissipation tooth 302 from reaching their optimal heat dissipation state. By controlling the ratio of tooth height to tooth pitch between 0.7 and 1, sufficient heat dissipation area can be ensured while ensuring smooth airflow, thereby achieving efficient heat dissipation.

[0041] In this embodiment, by rationally setting the ratio of tooth height to tooth spacing, a sufficiently large heat dissipation area is ensured, while airflow is not obstructed due to excessively small tooth spacing. Simultaneously, the evenly distributed heat dissipation teeth form an efficient air convection channel, promoting rapid heat dissipation. Furthermore, the evenly distributed heat dissipation teeth ensure that heat does not concentrate in any one area, but is evenly distributed on both sides of the housing 1; the symmetrical layout of the heat dissipation teeth makes heat dissipation more even.

[0042] When designing the heat dissipation fins, the ratio of fin height to fin spacing can be adjusted (between 0.7 and 1) according to the specific application scenario to adapt to different heat dissipation requirements. The evenly distributed design of the heat dissipation fins also facilitates production and installation. Symmetrically arranged heat dissipation fins improve structural stability and reduce the risk of deformation and damage caused by asymmetrical forces. A reasonable ratio of fin height to fin spacing ensures that the heat dissipation fins have good heat dissipation performance.

[0043] Furthermore, the side of the box 1 closest to the liquid inlet 101 is a low-temperature region, and the side of the box 1 closest to the liquid outlet 102 is a high-temperature region. The distribution density of the first heat dissipation tooth 301 in the high-temperature region is greater than that in the low-temperature region; and / or, the distribution density of the second heat dissipation tooth 302 in the high-temperature region is greater than that in the low-temperature region.

[0044] In this embodiment, there are three specific technical solutions: the distribution density of the first heat dissipation tooth 301 located in the high temperature region is greater than the distribution density of the first heat dissipation tooth 301 located in the low temperature region; the distribution density of the second heat dissipation tooth 302 located in the high temperature region is greater than the distribution density of the second heat dissipation tooth 302 located in the low temperature region; and the distribution density of the first heat dissipation tooth 301 located in the high temperature region is greater than the distribution density of the first heat dissipation tooth 301 located in the low temperature region, and the distribution density of the second heat dissipation tooth 302 located in the high temperature region is greater than the distribution density of the second heat dissipation tooth 302 located in the low temperature region.

[0045] In this embodiment, because the high-temperature region has concentrated heat, a larger heat dissipation area is needed to effectively dissipate the heat; the low-temperature region has less heat, so fewer heat dissipation teeth are needed, and an appropriate density is sufficient to meet the heat dissipation requirements. In the high-temperature region, the first heat dissipation tooth 301 and the second heat dissipation tooth 302 are evenly arranged on the outer side of the high-temperature region, with more teeth and smaller tooth spacing. This design can significantly increase the heat dissipation area and ensure that heat can be dissipated quickly. In the low-temperature region, the first heat dissipation tooth 301 and the second heat dissipation tooth 302 are evenly arranged on the outer side of the low-temperature region, but with fewer teeth and larger tooth spacing. This design can ensure a certain heat dissipation effect while saving materials and costs.

[0046] Specifically, in the initial state, cooling oil enters the housing 1 through the inlet 101. After absorbing some of the heat generated by the components in the low-temperature region, it gradually heats up. As the cooling oil flows, the heat gradually concentrates in the high-temperature region near the outlet 102. The heat in the high-temperature region is conducted through the wall of the housing 1 to the first and second heat dissipation fins 301 and 302 on the outside. In the high-temperature region, due to the denser heat dissipation fins, air can flow smoothly between these fins and carry away more heat. In the low-temperature region, although the density of the heat dissipation fins is smaller, the sparser heat dissipation fins are sufficient to meet the heat dissipation requirements because there is less heat in this region.

[0047] In this embodiment, by increasing the density of heat dissipation teeth, the heat in the high-temperature area can be dissipated quickly to avoid local overheating; in the low-temperature area, the number of heat dissipation teeth is appropriately reduced to reduce manufacturing costs and material usage, while not affecting the overall heat dissipation effect.

[0048] Please see Figure 4 The end of the first heat dissipation tooth 301 has an uneven structure; and / or the end of the second heat dissipation tooth 302 has an uneven structure.

[0049] This embodiment includes three technical solutions: the end of the first heat dissipation tooth 301 is uneven, or the end of the second heat dissipation tooth 302 is uneven, and both the end of the first heat dissipation tooth 301 and the end of the second heat dissipation tooth 302 are uneven.

[0050] In this embodiment, both the first heat dissipation tooth 301 and the second heat dissipation tooth 302 are configured with an uneven structure, which increases the contact area between the air and the surface of the heat dissipation tooth, thereby improving the heat dissipation efficiency. In addition, the uneven structure helps to generate more turbulence and enhance the airflow effect.

[0051] For example, the uneven structure can take many forms, such as wavy, sawtooth, and needle-like protrusions. Among them, when the uneven structure is wavy, it can increase the surface area in a limited space and promote airflow; when the uneven structure is sawtooth, it can effectively interrupt laminar airflow and form turbulence, further enhancing the heat dissipation effect; when the uneven structure is needle-like protrusion, it can provide a large surface area in a small space, which is suitable for high-density heat dissipation requirements.

[0052] Furthermore, the side of the box 1 closest to the liquid inlet 101 is a low-temperature region, and the side of the box 1 closest to the liquid outlet 102 is a high-temperature region; the tooth height of the first heat dissipation tooth 301 located in the low-temperature region is lower than the tooth height of the first heat dissipation tooth 301 located in the high-temperature region; and / or, the tooth height of the second heat dissipation tooth 302 located in the low-temperature region is lower than the tooth height of the second heat dissipation tooth 302 located in the high-temperature region.

[0053] In this embodiment, there are three different technical solutions: the tooth height of the first heat dissipation tooth 301 located in the low temperature region is lower than that of the first heat dissipation tooth 301 located in the high temperature region; the tooth height of the second heat dissipation tooth 302 located in the low temperature region is lower than that of the second heat dissipation tooth 302 located in the high temperature region; the tooth height of the first heat dissipation tooth 301 located in the low temperature region is lower than that of the first heat dissipation tooth 301 located in the high temperature region; and the tooth height of the second heat dissipation tooth 302 located in the low temperature region is lower than that of the second heat dissipation tooth 302 located in the high temperature region.

[0054] The low-temperature zone refers to the area with a relatively low cooling oil temperature, which can be determined by the cooling oil flow direction and temperature gradient distribution. The cooling oil absorbs heat after flowing in from the inlet 101, causing its temperature to gradually rise. The high-temperature zone refers to the area with a relatively high cooling oil temperature; the area near the outlet 102 forms a high-temperature zone due to heat accumulation. The difference in heat dissipation fin height refers to the different vertical extension dimensions of the heat dissipation fins located on the outer sides of different temperature zones. This can be achieved through stepped casting or modular assembly. The height difference increases the heat dissipation surface area in the high-temperature zone to match the heat load distribution.

[0055] Specifically, during the flow of cooling oil within the housing 1, the oil near the inlet 101 is in an initially cooled state, while the oil near the outlet 102 continuously absorbs heat and reaches a high temperature. By providing a taller first heat dissipation tooth 301 and a taller second heat dissipation tooth 302 on the outside of the high-temperature area, the contact area between this area and the air can be increased, accelerating heat transfer to the outside. The height of the heat dissipation teeth on the outside of the low-temperature area is reduced, which is beneficial for material conservation. The stepped height distribution of the heat dissipation teeth on both sides corresponds to the temperature gradient inside the housing 1, ensuring heat dissipation efficiency while maintaining the structural integrity of the housing 1 and preventing stress concentration in the material due to excessive local heat dissipation.

[0056] Compared to existing technologies, traditional aluminum casings employ a uniformly distributed heat dissipation fin structure, which cannot optimize heat dissipation for variations in oil temperature distribution, resulting in insufficient heat dissipation in high-temperature areas and redundant heat dissipation in low-temperature areas. This solution, by dividing temperature zones and differentially setting the height of the heat dissipation fins, precisely matches the heat dissipation capacity with the heat load distribution, overcoming the limitations of traditional aluminum materials' thermal conductivity while maintaining an IP68 protection rating.

[0057] Through the above technical solution, this application can effectively improve the heat dissipation efficiency in high-temperature areas, avoid power limitation problems caused by local overheating, and reduce redundant consumption of heat dissipation materials in low-temperature areas, ensuring that the oil-immersed module achieves a balance between heat dissipation capacity and protection performance under high load conditions.

[0058] Further, please refer to Figure 5 The ratio of the tooth height of the first heat dissipation tooth 301 located in the low temperature region to the tooth height of the first heat dissipation tooth 301 located in the high temperature region is c, and 0.5 < c < 1; and / or, the ratio of the tooth height of the second heat dissipation tooth 302 located in the low temperature region to the tooth height of the second heat dissipation tooth 302 located in the high temperature region is d, and 0.5 < d < 1.

[0059] This embodiment includes three specific technical solutions: the ratio of the tooth height of the first heat dissipation tooth 301 located in the low-temperature region to the tooth height of the first heat dissipation tooth 301 located in the high-temperature region is between 0.5 and 1; the ratio of the tooth height of the second heat dissipation tooth 302 located in the low-temperature region to the tooth height of the second heat dissipation tooth 302 located in the high-temperature region is between 0.5 and 1; and the ratios of the tooth height of the first heat dissipation tooth 301 located in the low-temperature region to the tooth height of the first heat dissipation tooth 301 located in the high-temperature region, and the ratio of the tooth height of the second heat dissipation tooth 302 located in the low-temperature region to the tooth height of the second heat dissipation tooth 302 located in the high-temperature region are both between 0.5 and 1.

[0060] Specifically, the ratio of the tooth height of the first heat dissipation tooth 301 located in the low-temperature region to the tooth height of the first heat dissipation tooth 301 located in the high-temperature region can be 0.6, 0.7, 0.8, 0.9, etc.; the ratio of the tooth height of the second heat dissipation tooth 302 located in the low-temperature region to the tooth height of the second heat dissipation tooth 302 located in the high-temperature region can be 0.6, 0.7, 0.8, 0.9, etc. Preferably, the tooth height of the first heat dissipation tooth 301 located in the low-temperature region can be 5 mm, and the tooth height of the first heat dissipation tooth 301 located in the high-temperature region can be 9 mm; the tooth height of the second heat dissipation tooth 302 located in the low-temperature region can be 5 mm, and the tooth height of the second heat dissipation tooth 302 located in the high-temperature region can be 9 mm. Of course, these tooth heights can be other values, as long as the above-mentioned tooth height ratio is satisfied.

[0061] The height of the heat dissipation fins on the outer side of the low-temperature zone refers to the vertical distance from the top of the heat dissipation fins located at the liquid inlet 101 area of ​​the housing 1 to the outer wall of the housing 1. This can be achieved using a stepped height difference structure, with heat dissipation fin assemblies of different heights formed through laser cutting or mold forming processes. The height of the heat dissipation fins on the outer side of the high-temperature zone refers to the vertical distance from the top of the heat dissipation fins located at the liquid outlet 102 area of ​​the housing 1 to the outer wall of the housing 1. This can be achieved using a continuously varying height structure, with the forming parameters of the heat dissipation fins adjusted through CNC machining. The height ratios c and d refer to the proportional relationship between the heights of the heat dissipation fins in the low-temperature zone and the high-temperature zone. This can be achieved using a segmented design method, with thermal imaging data guiding the fin height configuration in different areas.

[0062] Specifically, when the cooling oil flows through housing 1, the oil temperature in the high-temperature region near the outlet is significantly higher than that in the low-temperature region near the inlet 101. By setting relatively tall heat dissipation fins in the high-temperature region, the heat dissipation surface area of ​​this region can be effectively increased, enhancing the convective heat transfer effect. The height of the heat dissipation fins in the low-temperature region is appropriately reduced to decrease material consumption. The fin height ratio is limited to between 0.5 and 1, ensuring that the heat dissipation fins in the high-temperature region have sufficient heat exchange capacity while preventing the heat dissipation fins in the low-temperature region from being too tall and causing structural redundancy. In actual operation, this ratio is determined through thermodynamic simulation to match the heat dissipation capacity and temperature distribution of different regions.

[0063] Compared to existing technologies, traditional heat dissipation structures typically employ a uniform fin layout, which cannot adapt to the significant temperature gradient distribution within oil-immersed modules. Conventional solutions often suffer from insufficient heat dissipation in high-temperature regions and material waste in low-temperature regions. This solution establishes a segmented, differentiated fin height ratio, enabling the heat conduction efficiency of the heat dissipation structure to precisely match the temperature characteristics of different regions.

[0064] Through the above technical solution, this application effectively solves the technical problem of unbalanced heat dissipation requirements in high and low temperature regions of oil-immersed modules, optimizing the space utilization of the heat dissipation structure while maintaining the overall thermal balance of the system. Improved heat dissipation capacity in high-temperature regions prevents oil degradation caused by localized overheating, while reasonable control of heat dissipation intensity in low-temperature regions avoids unnecessary energy loss. Precise setting of the tooth height ratio ensures optimal matching between the heat exchange efficiency of the heat dissipation device and the internal thermodynamic characteristics of the module.

[0065] Please see Figure 6 , Figure 7 Each of the first heat dissipation teeth 301 has a first through hole 303 along its thickness direction; and / or, each of the second heat dissipation teeth 302 has a second through hole 304 along its thickness direction.

[0066] In this embodiment, the specific solution is as follows: each first heat dissipation tooth 301 has a first through hole 303 along its thickness direction; each second heat dissipation tooth 302 has a second through hole 304 along its thickness direction; and each first heat dissipation tooth 301 and each second heat dissipation tooth 302 have through holes along their thickness direction.

[0067] Specifically, the first through hole 303 can be processed during the heat dissipation tooth forming stage using a stamping process or a laser cutting process. This structure can increase the heat exchange area on the surface of the heat dissipation tooth.

[0068] Specifically, the second through hole 304 can be formed synchronously on the opposite side heat dissipation teeth using the same processing technology. This design makes the heat dissipation teeth on both sides of the box 1 form symmetrical penetration channels.

[0069] Specifically, the through holes extend along the thickness of the heat dissipation fins, forming an airflow path. When the cooling oil circulates inside the housing 1, heat from the surface of the heat dissipation fins is conducted to the inner wall of the through holes through the metal. External air flows through the through holes, carrying away the accumulated heat. The direction of the through holes is parallel to the main stress direction of the heat dissipation fins, expanding the heat dissipation surface area while ensuring support strength. The array of through holes forms a through-type heat dissipation channel, which, together with the symmetrical layout of the heat dissipation fins on both sides of the housing 1, forms a continuous heat conduction path from the high-temperature region to the low-temperature region.

[0070] In some specific embodiments, the through holes can be configured as a circular or polygonal array, and the spacing between the holes can be adjusted according to the heat dissipation requirements. The inner wall of the through holes can be provided with a corrugated surface to increase the turbulence effect, and the axis of the through holes can form a preset tilt angle with the height direction of the heat dissipation teeth to optimize the airflow path.

[0071] Compared to existing technologies, traditional heat dissipation fins use a solid structure and rely solely on natural surface convection for heat dissipation. This solution, however, enhances both forced convection and radiative heat dissipation through a perforated structure. Conventional heat dissipation fins typically use transverse openings perpendicular to the airflow direction; this solution uses openings along the thickness direction, maintaining structural integrity while avoiding excessive airflow resistance. Existing technologies require increasing the height of the heat dissipation fins to increase the heat dissipation area, while this solution expands the effective heat dissipation surface area within a limited space through a three-dimensional perforated structure.

[0072] Through the above technical solution, this application effectively improves the heat dissipation efficiency of the sealed oil-immersed module, enhances heat exchange capacity through a penetrating heat dissipation channel, and avoids local overheating during high-load operation. This structure achieves active heat dissipation optimization while maintaining an IP68 protection rating, solving the heat dissipation bottleneck of traditional solid heat sinks under conditions without forced air cooling, while maintaining the structural stability and deformation resistance of the heat dissipation component.

[0073] Please see Figure 8 As an optional implementation, another embodiment of this application provides a charging system, which includes at least two power modules 110, a controller 130, a power distribution device 140, and at least one charging interface 120. The power distribution device 140 is connected to the controller 130, each power module 110, and each charging interface 120. The power modules 110 convert AC power from the power grid into DC power and supply it to the charging interfaces 120. Each power module 110 includes a heat dissipation structure as described in any of the above possible implementations. The controller 130 acquires the power demand of each charging interface 120 and generates a scheduling command based on the connection relationship of the controllable switches in the power distribution device 140 and the power demand. The power distribution device 140 controls the opening or closing of the controllable switches according to the scheduling command to distribute the output power of each power module 110 to each charging interface 120.

[0074] The application of the oil-immersed power module heat dissipation structure in this application to a charging system primarily serves to ensure uniform heat dissipation from the power module, thereby cooling all parts of the power module and extending its lifespan. This, in turn, extends the lifespan of the charging system.

[0075] In one optional implementation, the charging system provided in this application is an integrated DC charging pile, with the charging interface 120 used to connect the charging gun, and the charging gun being hung on the host of the charging system via the gun holder on the main body of the charging system.

[0076] In one optional implementation, the charging system provided in this application is a split-type DC charging pile. The charging system also includes multiple charging terminals. The charging interface 120 is used to connect the charging terminals. The charging terminals are set separately from the main body of the charging system. The charging terminals are equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0077] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A heat dissipation structure for an oil-immersed power module, characterized in that, The power module is fully immersed in oil, and the heat dissipation structure includes: The housing (1) is provided with a liquid inlet (101) and a liquid outlet (102), and the liquid inlet (101) and the liquid outlet (102) are connected to an external cooling oil circulation pipeline; A heat dissipation component (2) is disposed on the outside of the housing (1) for dissipating heat from the power module; The heat dissipation component (2) includes a plurality of heat dissipation teeth (3), and the extension directions of the liquid inlet (101) and the liquid outlet (102) are perpendicular to the plurality of heat dissipation teeth (3). The plurality of heat dissipation teeth (3) include: Multiple first heat dissipation teeth (301) are fixed to one side outside the housing (1); And / or, a plurality of second heat dissipation teeth (302) are fixed to the other side outside the housing (1); The side of the box (1) closest to the liquid inlet (101) is a low-temperature area, and the side of the box (1) closest to the liquid outlet (102) is a high-temperature area. The distribution density of the first heat dissipation tooth (301) located in the high temperature region is greater than the distribution density of the first heat dissipation tooth (301) located in the low temperature region. And / or, the distribution density of the second heat dissipation tooth (302) located in the high temperature region is greater than the distribution density of the second heat dissipation tooth (302) located in the low temperature region.

2. The heat dissipation structure according to claim 1, characterized in that, Each of the first heat dissipation teeth (301) is uniformly arranged on one side outside the box (1), and the ratio of the tooth height of the first heat dissipation tooth (301) to the tooth spacing of the first heat dissipation tooth (301) is a, and 0.7 < a < 1. And / or, each of the second heat dissipation teeth (302) is uniformly arranged on the other side outside the housing (1), and the ratio of the tooth height of the second heat dissipation tooth (302) to the tooth spacing of the second heat dissipation tooth (302) is b, and 0.7 < b < 1.

3. The heat dissipation structure according to claim 1, characterized in that, The end of the first heat dissipation tooth (301) has an uneven structure; And / or, the end of the second heat dissipation tooth (302) has an uneven structure.

4. The heat dissipation structure according to claim 1, characterized in that, The side of the box (1) closest to the liquid inlet (101) is a low-temperature area, and the side of the box (1) closest to the liquid outlet (102) is a high-temperature area. The tooth height of the first heat dissipation tooth (301) located in the low temperature region is lower than the tooth height of the first heat dissipation tooth (301) located in the high temperature region. And / or, the tooth height of the second heat dissipation tooth (302) located in the low temperature region is lower than the tooth height of the second heat dissipation tooth (302) located in the high temperature region.

5. The heat dissipation structure according to claim 4, characterized in that, The ratio of the tooth height of the first heat dissipation tooth (301) located in the low temperature region to the tooth height of the first heat dissipation tooth (301) located in the high temperature region is c, and 0.5 < c < 1. And / or, the ratio of the tooth height of the second heat dissipation tooth (302) located in the low temperature region to the tooth height of the second heat dissipation tooth (302) located in the high temperature region is d, and 0.5 < d < 1.

6. The heat dissipation structure according to claim 1, characterized in that, Each of the first heat dissipation teeth (301) has a first through hole (303) along its thickness direction; And / or, each of the second heat dissipation teeth (302) is provided with a second through hole (304) along its thickness direction.

7. A charging system, characterized in that, include: The system includes at least two power modules (110), a controller (130), a power distribution device (140), and at least one charging interface (120), wherein the power distribution device (140) is connected to the controller (130), each of the power modules (110), and each of the charging interfaces (120), respectively. The power module (110) is used to convert AC power from the power grid into DC power and supply it to the charging interface (120). The power module (110) includes a heat dissipation structure as described in any one of claims 1 to 6. The controller (130) is used to obtain the power demand of each of the charging interfaces (120) and generate scheduling instructions according to the connection relationship of the controllable switches in the power distribution device (140) and the power demand. The power distribution device (140) is used to control the opening or closing of the controllable switch according to the scheduling instruction, so as to distribute the output power of each power module (110) to each charging interface (120).

8. The charging system according to claim 7, characterized in that, The charging system is an integrated DC charging pile. The charging interface (120) is used to connect the charging gun. The charging gun is connected to the host of the charging system through the gun holder on the main body of the charging system.

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