Power conversion device

Abstract

A power conversion device (10) comprises: a housing (100) defining an accommodating cavity (130), the housing (100) being provided with a sprue gate (1111) and an exhaust port (1121), both the sprue gate (1111) and the exhaust port (1121) communicating with the accommodating cavity (130); the circuit board (200) is arranged in the containing cavity (130), the circuit board (200) is provided with a first face (210) used for installing electronic components, and the pouring port (1111) is closer to the first face (210) relative to the exhaust port (1121).

Description

[0001] Related applications

[0002] This disclosure claims priority to Chinese patent application No. 2024106539813, filed on May 23, 2024, entitled "Power Conversion Device and Manufacturing Method Thereof", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of new energy technology, and in particular to a power conversion device and its manufacturing method. Background Technology

[0004] With the rapid development of new energy technologies, solar energy is widely used in daily production and life due to its advantages such as being pollution-free and sustainable. Generally, solar energy can be converted into electrical energy through photovoltaic power generation technology. The direct current generated by photovoltaic power generation is then converted into alternating current through a power conversion device. This alternating current can then be used as electrical energy and input into the power grid through a connector. In order for the power conversion device to operate in various harsh environments, it is usually necessary to inject a casting fluid inside the power conversion device for sealing and protection. However, traditional power conversion devices often suffer from uneven filling of the casting fluid. Summary of the Invention

[0005] One technical problem addressed by this disclosure is how to improve the casting uniformity of power conversion devices.

[0006] The first aspect of this disclosure provides a power conversion device, comprising:

[0007] A shell, forming a receiving cavity, wherein the shell has a pouring port and a vent, both of which are connected to the receiving cavity; and

[0008] A circuit board is disposed within the accommodating cavity, the circuit board having a first side for mounting electronic components, and the pouring port being closer to the first side than the venting port.

[0009] A second aspect of this disclosure provides a manufacturing method for processing the above-described power conversion device, comprising the following steps:

[0010] The power conversion device is set at a first angle with the horizontal plane as the reference plane, and the pouring port is lower in the vertical direction relative to the exhaust port;

[0011] The casting liquid is injected into the receiving cavity through the pouring port; and

[0012] Seal the pouring port and the vent.

[0013] Details of one or more embodiments of this disclosure are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description

[0014] To better describe and illustrate embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the currently described embodiments and / or examples, or the best mode of these inventions as currently understood.

[0015] Figure 1 This is a three-dimensional structural diagram of a power conversion device of the first prior art.

[0016] Figure 2 This is a three-dimensional structural diagram of a power conversion device of the second prior art.

[0017] Figure 3 This is a three-dimensional structural schematic diagram of a power conversion device provided in one embodiment.

[0018] Figure 4 for Figure 3 The diagram shows a three-dimensional structure of the power conversion device from another perspective.

[0019] Figure 5 for Figure 3 The diagram shows a first example exploded structure of the power conversion device.

[0020] Figure 6 for Figure 3 The second example exploded structural diagram of the power conversion device shown.

[0021] Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle.

[0022] Figure 8 for Figure 3 A three-dimensional cross-sectional view of the power conversion device shown.

[0023] Figure 9 for Figure 3 The diagram shows a planar structure of the power conversion device.

[0024] Figure 10 for Figure 3 The diagram shows a three-dimensional structure of the power conversion device that is tilted relative to the horizontal plane.

[0025] Figure 11 Provided for one embodiment Figure 3 The diagram shows the process flow of the manufacturing method for the power conversion device. Detailed Implementation

[0026] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this disclosure. However, this disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below.

[0027] In the description of this disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0030] In this disclosure, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only possible implementation.

[0032] In the field of photovoltaic power generation technology, the direct current (DC) generated by photovoltaic power generation is converted into alternating current (AC) through a power conversion device. This AC power can be directly input into the power grid or stored using energy storage devices. In order for the power conversion device to operate in various harsh environments, not only is it necessary to seal the outer casing of the power conversion device, but it is also usually necessary to inject a potting fluid inside the power conversion device to seal and protect the electronic components inside.

[0033] exist Figure 1 In the prior art shown, the pouring port a is located on the side of the housing, making the pouring port a far away from the side of the power conversion device opposite to the pouring port a. This makes it difficult for the pouring liquid to effectively fill the side of the power conversion device opposite to the pouring port a, thus making it difficult to ensure the uniformity of the pouring. Figure 2 In the prior art shown, the pouring port b and the venting port c are both on the same plane, and the venting port c is located in the middle of the power conversion device housing. This makes it difficult for the gas in the power conversion device to accumulate in the venting port c and be discharged. Therefore, the power conversion device is affected by the presence of residual gas, which affects the uniformity of the pouring.

[0034] See Figure 3 , Figure 5 and Figure 6According to one embodiment of this disclosure, a power conversion device 10 includes a housing 100 and a circuit board 200. The housing 100 forms a receiving cavity 130, and the circuit board 200 is disposed within the receiving cavity 130. The housing 100 has a pouring port 1111 and an exhaust port 1121, both of which are connected to the receiving cavity 130. The circuit board 200 has a first surface 210 and a second surface 220, which are two surfaces arranged opposite to each other in a direction perpendicular to the first surface. In the direction perpendicular to the first surface, the first surface 210 faces the pouring port 1111 and the exhaust port 1121. The first surface 210 is also used to mount other electronic components. In the direction perpendicular to the first surface, the pouring port 1111 is closer to the first surface 210 than the exhaust port 1121.

[0035] One possible implementation is, such as Figure 3 As shown, the pouring port 1111 and the vent 1121 can be ΔH apart in the direction perpendicular to the first surface. The value of ΔH can be from 10mm to 15mm. For example, the specific value of ΔH can be 10mm, 12.5mm or 15mm, etc.

[0036] like Figure 5 As shown, the power conversion device 10 also includes a transformer 300, which can be disposed on the first surface 210. The casting liquid can be injected into the receiving cavity 130 from the pouring port 1111. The solidified casting liquid can seal and protect the housing 100 and electronic components, ensuring that the power conversion device 10 can withstand various harsh environments such as humidity, heat, acids, alkalis, rain, snow, and freezing, and also improving the shock resistance of the power conversion device 10. During the injection of the casting liquid from the pouring port 1111, air in the receiving cavity 130 will be gradually discharged from the exhaust port 1121.

[0037] The casting fluid can be an electrically insulating material, such as an adhesive made of silicone. This gives the cured casting fluid good elasticity to withstand greater stress. In essence, any material that possesses both electrical insulation properties and elasticity after curing can be used as a casting fluid.

[0038] Since the pouring port 1111 is closer to the first surface 210 than the vent 1121, during the process of filling the cavity 130 with the pouring liquid, the liquid surface formed by the pouring liquid in the cavity 130 will finally reach the vent 1121. This prevents the liquid surface from reaching the vent 1121 before the cavity 130 is filled with the pouring liquid and thus blocking the vent 1121. This prevents the vent 1121 from being blocked and unable to effectively vent, thereby ensuring that all the air in the cavity 130 can be discharged to the outside through the vent 1121. This also prevents the residual gas in the cavity 130 from affecting the uniformity of the pouring liquid filling, which in turn improves the uniformity of the glue injection.

[0039] See Figure 3 , Figure 4 and Figure 9 In some embodiments, the housing 100 has a first corner 140, where the two sides of the housing 100 intersect. It can be understood that the portion within a predetermined distance from the intersection line of the two sides of the housing 100 is the first corner 140. The two sides of the housing 100 are respectively designated as the first side 101 and the second side 102. For example, a position on the housing 100 that is 20mm to 30mm from the first side 101 and 20mm to 35mm from the second side 102 is considered the first corner 140. The predetermined distance from the first side 101 can specifically be 20mm or 25mm, and the predetermined distance from the second side 102 can specifically be 25mm or 30mm, etc. The length of the first side 101 can be greater than the length of the second side 102, i.e., the first side 101 is the longer side and the second side 102 is the shorter side. Of course, the lengths of the first side 101 and the second side 102 can also be equal.

[0040] The vent 1121 is located near the first corner 140. For example, the center of the vent 1121 can be located at the first corner 140, or at least partially located at the first corner 140. The vent 1121 can be circular, etc. Thus, during the filling of the cavity 130 with the injection liquid, since the first corner 140 is the intersection of two directions, air from various locations in the cavity 130 is more likely to converge at the first corner 140 from different directions. This results in a relatively high air pressure near the vent 1121, ensuring that gas is quickly discharged from the vent 1121, preventing gas residue in the cavity 130 from affecting the uniformity of the injection liquid filling, and ultimately improving the uniformity of the injection.

[0041] See Figure 4 , Figure 5 and Figure 6 In some embodiments, the housing 100 can be a contoured structure. The housing 100 can be made of electrically insulating materials such as plastic. The first surface 210 of the circuit board 200 is oriented towards the contoured structure in a direction perpendicular to the first surface. The contoured structure can be understood as an uneven structure suitable for electronic components protruding at different heights relative to the circuit board 200 within the accommodating cavity 130. For example, the contoured structure can be a coarse structure, that is, by setting a predetermined height between a certain part of the housing 100 and the circuit board 200, it can accommodate multiple electronic components with protrusion heights relative to the circuit board 200 within a certain range. Alternatively, the contoured structure can be a fine structure, that is, by setting a predetermined height between different parts of the housing 100 and the circuit board 200, it can accommodate each electronic component with different protrusion heights relative to the circuit board 200. By setting the contoured structure, the amount of casting liquid used can be saved.

[0042] The contoured structure can have rounded corners, which can improve the uniformity of the pouring fluid flow rate, prevent gas residue in the accommodating cavity 130 from affecting the uniformity of the pouring fluid filling, and thus prevent the presence of pores in the solid formed after the pouring fluid has solidified.

[0043] Continue reading Figure 4 , Figure 5 and Figure 6 The contoured structure includes a first region 111 and a second region 112. The first region 111 is closer to the first surface 210 than the second region 112. This can be understood as the first region 111 being vertically lower than the second region 112. The pouring gate 1111 is located in the first region 111, and the vent 1121 is located in the second region 112. This makes the pouring gate 1111 closer to the first surface 210 than the vent 1121, and thus the pouring gate 1111 is lower than the vent 1121. The vent 1121 is located in the second region 112 near the first corner 140. This allows gas to be quickly discharged from the vent 1121 and prevents it from remaining in the receiving cavity 130, thereby improving the uniformity of the glue injection.

[0044] See Figure 4 , Figure 5 , Figure 6 and Figure 9 In some embodiments, the first region 111 includes a second corner 1112, where the two sides of the first region 111 intersect. It can be understood that the portion within a preset distance from the intersection line of the two sides of the first region 111 is the second corner 1112. The two sides of the first region 111 are respectively denoted as the third side 103 and the fourth side 104 of the first region 111. For example, the position on the first region 111 that is 10mm to 20mm away from the third side 103 and 15mm to 25mm away from the fourth side 104 belongs to the second corner 1112. The preset distance from the third side 103 can be 15mm or 20mm, and the preset distance from the fourth side 104 can be 20mm or 25mm, etc.

[0045] The gating gate 1111 is located near the second corner 1112. For example, the center of the gating gate 1111 can be located within the second corner 1112, or at least partially within the second corner 1112. The gating gate 1111 can be circular, or it can be square or a regular polygon. The second corner 1112 has a rounded corner. By setting the rounded corner to avoid dead corners, it will help improve the flow of the casting liquid in the receiving cavity 130. On the one hand, it allows the casting liquid to quickly fill the receiving cavity 130, improving the injection efficiency; on the other hand, it also helps the rapidly flowing casting liquid to expel the gas in the receiving cavity 130 from the vent 1121, thereby avoiding residual gas that would affect the uniformity of the injection. When the gating gate 1111 is circular, the circular gating gate 1111 and the rounded corner are compatible, which can save the area of ​​the shell 100 and make the shell 100 easier to process.

[0046] See Figure 4 , Figure 5 and Figure 6 The second region 112 includes a third corner 1123, where the two sides of the second region 112 intersect. It can be understood that the portion within a predetermined distance from the intersection line of the two sides of the second region 112 is the third corner 1123. The definition of the third corner 1123 can be referenced to the second corner 1112 described above. The vent 1121 is located at the third corner 1123, which also makes it easier for air in the receiving cavity 130 to converge at the third corner 1123, preventing gas residue in the receiving cavity 130 from affecting the uniformity of the filling fluid and ultimately improving the uniformity of the injection.

[0047] See Figure 4 , Figure 5 and Figure 6 Given that the pouring gate 1111 is located in the first region 111 and the vent 1121 is located in the second region 112, the centers of the pouring gate 1111 and the vent 1121 are kept at a preset distance. The preset distance ranges from 120mm to 140mm, and the specific value of the preset distance can be 120mm, 130mm, or 140mm, etc. This arrangement of the pouring gate 1111 and the vent 1121 also facilitates an appropriate flow distance for the pouring liquid, thereby optimizing the venting effect and ultimately improving the uniformity of the glue injection.

[0048] For example, the diameter of the pouring port 1111 and the venting port 1121 can be 5mm to 15mm. The diameters of the pouring port 1111 and the venting port 1121 can be different. For example, the diameter of the pouring port 1111 can be smaller than the diameter of the venting port 1121. This makes the venting port 1121 have a relatively large diameter, which helps to reduce the flow resistance of gas flowing through the venting port 1121, thereby improving the venting effect and ultimately improving the uniformity of the glue injection.

[0049] See Figure 5 In some embodiments, the first surface 210 of the circuit board 200 has a blank area 211 on which no electronic components are installed. The orthographic projection of the gating nozzle 1111 in a direction perpendicular to the first surface falls on this blank area 211. This can be understood as the gating nozzle 1111 being located directly above the blank area 211, thus offsetting the gating nozzle 1111 from the electronic components on the circuit board 200. This prevents the casting liquid flowing from the gating nozzle 1111 from directly falling on the electronic components, thereby preventing the pressure of the casting liquid from directly acting on the electronic components and causing damage, ultimately improving the safety of the potting process.

[0050] See Figure 5 and Figure 6 In some embodiments, the first surface 210 has a DC region 212 and an AC region 213. The DC region 212 is used to mount DC electronic components, which are DC-side devices. Of course, the DC region 212 can also mount AC electronic components. DC electronic components typically have few encapsulation housings, so most DC electronic components are exposed electronic components. The AC region 213 is used to mount AC electronic components, which are AC-side devices. AC electronic components typically have encapsulation housings, so most AC electronic components are encapsulated electronic components.

[0051] Since most DC electronic components are exposed, the orthographic projection of the gating port 1111 in the direction perpendicular to the first surface can fall on the DC region 212, that is, the gating port 1111 is located directly above the DC region 212 and the DC electronic components. This allows the casting liquid flowing out of the gating port 1111 to cover the DC region 212 and the DC electronic components earlier and more extensively, allowing the gas to flow out of the DC region 212 earlier, avoiding air bubbles remaining in the DC region 212, and improving the coverage effect of the casting liquid on the DC region 212 and the DC electronic components. This provides a more robust encapsulation and protection for the exposed DC electronic components.

[0052] Since most of the AC electronic components are already encapsulated, they already have high protection performance and have low requirements for encapsulation with potting fluid. This allows the orthographic projection of the exhaust port 1121 in the direction perpendicular to the first surface to fall on the AC region 213, that is, directly above the AC region 213 and the AC electronic components. This causes the gas in the accommodating cavity 130 to accumulate near the AC region 213 and be discharged from the exhaust port 1121.

[0053] See Figure 3 and Figure 5The power conversion device 10 may further include a connector assembly 400, which may include a DC component 410 and an AC component 420. The housing 100 has a mounting side 150, on which the connector assembly 400 is disposed. The distance between the pouring gate 1111 and the mounting side 150 is less than a preset distance. For example, the distance between the pouring gate 1111 and the mounting side 150 may be less than or equal to 2 mm. It is understandable that the presence of the connector assembly 400 will affect the sealing performance of the mounting side 150 of the housing 100. Therefore, when the distance between the pouring port 1111 and the mounting side 150 is less than the preset distance, sufficient pouring liquid can have enough time to fill the gap between the connector assembly 400 and the housing 100, thereby sealing the gap between the connector assembly 400 and the housing 100. This also allows gas to flow out of the area near the mounting side 150 earlier, preventing air bubbles from remaining in the area near the mounting side 150 and affecting the uniformity of pouring. This improves the coverage effect of the pouring liquid on the mounting side 150, and ultimately improves the sealing performance of the power conversion device 10.

[0054] See Figure 5 , Figure 6 and Figure 8 In some embodiments, the housing 100 may include a first housing 110 and a second housing 120, which together form a receiving cavity 130. A pouring port 1111 and an vent 1121 are also provided on the first housing 110, and the circuit board 200 is supported on the second housing 120. An annular groove 121 is provided on the second housing 120, which surrounds the circuit board 200. During the installation of the first housing 110 and the second housing 120, the flange on the first housing 110 can engage with the annular groove 121. It can be understood that the flange is also annular, so that the flange on the first housing 110 can be inserted into the annular groove 121. During the assembly of the power conversion device 10, the flange on the first housing 110 can first be engaged with the annular groove 121. Then, sealing material is placed into the annular groove 121, which seals both the annular groove 121 and the receiving cavity 130. Furthermore, the sealing material connects the first housing 110 and the second housing 120 to form a complete housing 100. After the housing 100 is assembled, casting liquid can be injected into the receiving cavity 130 through the pouring port 1111 to encapsulate the entire power conversion device 10. The sealing material can be adhesive, etc.

[0055] See Figure 6 , Figure 7 and Figure 8In some embodiments, the second housing 120 includes a limiting member 122 for supporting the circuit board 200. The limiting member 122 has a first limiting surface 1221 and a second limiting surface 1222, which are connected at an included angle, for example, the first limiting surface 1221 and the second limiting surface 1222 can be perpendicular to each other. The first limiting surface 1221 abuts against the second surface 220 in a direction perpendicular to the first surface, so that the first limiting surface 1221 supports the circuit board 200, and also creates a gap 230 between the circuit board 200 and the second housing 120 in a direction perpendicular to the first surface. The second limiting surface 1222 abuts against the circuit board 200 in a direction perpendicular to the first surface.

[0056] See Figure 6 , Figure 7 and Figure 8 For example, the limiting member 122 is an edge limiting member 1223, which is disposed on the edge of the second shell 120. The second limiting surface 1222 of the edge limiting member 1223 abuts against the edge of the circuit board 200, thereby forming a flow channel 240 with a connecting gap 230 between the edge of the circuit board 200 and the second shell 120. Obviously, this flow channel 240 surrounds the circuit board 200. During the process of the casting liquid flowing from the pouring port 1111 into the receiving cavity 130, the casting liquid located on the side of the first surface 210 of the circuit board 200 will enter into the gap 230 through the flow channel 240, thereby allowing the casting liquid to enter the side of the second surface 220 of the circuit board 200, so that the casting liquid covers the first surface 210 and the second surface 220, and then the casting liquid covers the entire circuit board 200, ultimately improving the packaging effect of the circuit board 200.

[0057] See Figure 6 , Figure 7 and Figure 8 For example, the limiting member 122 is an intermediate limiting member 1224, which is located in the middle of the second shell 120. The intermediate limiting member 1224 includes a support member 1225 and a column 1226, with the column 1226 located in the middle of the support member 1225. There can be one support member 1225 and one column 1226. The column 1226 can be inserted into the support member 1225 and protrude relative to it. Alternatively, there can be multiple support members 1225 and one column 1226, with multiple support members 1225 surrounding the column 1226. The first limiting surface 1221 is the upper surface of the support member 1225, and the outer surface of the column 1226 is the second limiting surface 1222. The column 1226 penetrates the circuit board 200, so that it passes through a through hole in the circuit board 200.

[0058] Depending on the actual needs, the intermediate limiting member 1224 and the edge limiting member 1223 can be used individually, that is, the second shell 120 may include only the intermediate limiting member 1224 or only the edge limiting member 1223. Alternatively, the intermediate limiting member 1224 and the edge limiting member 1223 can be used simultaneously, that is, the second shell 120 may include both the intermediate limiting member 1224 and only the edge limiting member 1223. There can be multiple intermediate limiting members 1224 and edge limiting members 1223.

[0059] See Figure 3 and Figure 4 In some embodiments, the power conversion device 10 further includes a seal 500, which is used to seal the pouring port 1111 and the vent 1121. After the accommodating cavity 130 is completely filled with the pouring liquid and the pouring liquid has solidified, the seal 500 can be used to seal the pouring port 1111 and the vent 1121, thereby preventing external dust and liquid from entering the accommodating cavity 130.

[0060] See Figure 3 and Figure 5 In some embodiments, the power conversion device 10 further includes an indicator light 600. The indicator light 600 includes a light-emitting part 610 and a sealing part 620. The light-emitting part 610 is disposed on the first surface 210, and the sealing part 620 covers the light-emitting part 610 and is in contact with the first surface 210. The sealing part 620 can protect the light-emitting part 610 and prevent the casting liquid from covering the light-emitting part 610. The light generated by the indicator light 600 can be transmitted through the housing 100 with light-transmitting properties, or through the light-transmitting hole on the housing 100, thereby determining the working status of the circuit board 200 based on the illumination status of the indicator light 600. Furthermore, the indicator light 600 may also include a light guide post 630, which is connected to the sealing part 620. The light guide post 630 is used to guide the light signal of the light-emitting part 610 to the outer surface of the housing 100, thereby making it easier to track the illumination status of the indicator light 600.

[0061] See Figure 10 and Figure 11 This disclosure also provides a method for manufacturing a power conversion device 10, which mainly includes the following steps:

[0062] S710, the power conversion device 10 is set to a first angle α with the horizontal plane as the reference plane, and the pouring port 1111 is lower in the vertical direction relative to the exhaust port 1121.

[0063] S720, the casting liquid is injected into the receiving cavity 130 through the pouring port 1111.

[0064] S730, seal the pouring port 1111 and the vent 1121.

[0065] In some embodiments, for example, the power conversion device 10 can be placed horizontally on a horizontal surface, in which case the value of the first angle α is 0°. Alternatively, the power conversion device 10 can be placed at an angle on a horizontal surface, in which case the value of the first angle α ranges from 15° to 30°, and the specific value of the first angle α can be 15°, 20°, or 30°, etc. Of course, when the power conversion device 10 is tilted, the pouring port 1111 must be positioned lower in the vertical direction relative to the vent port 1121. By tilting the power conversion device 10, the vertical distance between the vent port 1121 and the pouring port 1111 can be further increased, which is more conducive to improving the fluidity of the pouring liquid and also facilitates the discharge of gas from the vent port 1121, thereby improving the pouring uniformity of the power conversion device 10.

[0066] For ease of description, the two long sides of the power conversion device 10, which are positioned opposite each other, are referred to as the first long side and the second long side, respectively, and the two short sides of the power conversion device 10, which are positioned opposite each other, are referred to as the first short side and the second short side, respectively. During the tilting process, the power conversion device 10 can be fixed by a clamp. For example, the first short side of the power conversion device 10 can be set parallel to the horizontal plane, so that the position of the second short side of the power conversion device 10 relative to the horizontal plane is higher than that of the first short side. At this time, the long side of the power conversion device 10 forms a first angle α with the horizontal plane. Figure 9 This describes the case where the first short side of the power conversion device 10 is parallel to the horizontal plane. Alternatively, the first long side of the power conversion device 10 can be parallel to the horizontal plane, such that the second long side of the power conversion device 10 is positioned higher than the first long side relative to the horizontal plane. In this case, the short side of the power conversion device 10 forms a first angle α with the horizontal plane. Furthermore, the intersection of the two long sides and the short side of the power conversion device 10 can be placed on a fixture, allowing both the long and short sides of the power conversion device 10 to form a first angle α with respect to the horizontal plane.

[0067] In some embodiments, during the process of injecting glue into the receiving cavity 130 through the pouring port 1111, glue can be injected into the receiving cavity 130 through a one-way valve, which prevents glue backflow. For example, by setting the one-way valve at the pouring port 1111, the one-way valve only allows the casting liquid to enter the receiving cavity 130 from the outside and prevents the casting liquid in the receiving cavity 130 from flowing out of the one-way valve to the outside. This can effectively prevent the casting liquid in the receiving cavity 130 from overflowing from the pouring port 1111, allowing the casting liquid to fill the receiving cavity 130 as quickly as possible, thereby improving the casting efficiency and avoiding waste of casting liquid.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the scope of protection of this disclosure. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A power conversion device, wherein, include: A shell is provided to form a receiving cavity, and the shell is provided with a pouring port and an exhaust port, both of which are connected to the receiving cavity; and A circuit board is disposed within the accommodating cavity. The circuit board has a first surface for mounting electronic components. The pouring port is closer to the first surface than the vent. The first surface is disposed facing the pouring port and the vent in a direction perpendicular to the first surface. It also includes a connector assembly, the housing having a mounting side for mounting the connector assembly, the pouring port being located near the mounting side, the housing having a first corner where two sides intersect, and the vent being located near the first corner.

2. The power conversion device according to claim 1, wherein, The pouring port and the vent are spaced ΔH apart in a direction perpendicular to the first surface.

3. The power conversion device according to claim 1, wherein, The first surface has a blank area where no electronic components are installed, and the orthographic projection of the pouring gate in a direction perpendicular to the first surface falls on the blank area.

4. The power conversion device according to claim 1, wherein, The first surface has a DC region and an AC region. The DC region is used to install DC electronic components, and the AC region is used to install AC electronic components. Along a direction perpendicular to the first surface, the orthographic projection of the pouring port falls on the DC region, and the orthographic projection of the vent falls on the AC region.

5. The power conversion device according to claim 2, wherein, The value of ΔH ranges from 10 mm to 15 mm.

6. The power conversion device according to claim 1, wherein, The exhaust port is circular.

7. The power conversion device according to claim 1, wherein, The housing is a contoured structure, which includes a first region and a second region. The first region is closer to the first surface than the second region, and the exhaust port is located in the second region near the first corner.

8. The power conversion device according to claim 1, wherein, The shell is a contoured structure, which includes a first region and a second region. The first region is closer to the first surface than the second region. The pouring port is located in the first region, and the vent is located in the second region.

9. The power conversion device according to claim 8, wherein, The first region includes a second corner with rounded corners, and the pouring gate is located near the second corner and is circular.

10. The power conversion device according to claim 8, wherein, The second region includes a third corner, and the exhaust port is located near the third corner.

11. The power conversion device according to claim 1, wherein, The centers of the pouring port and the vent are kept at a preset distance, and the preset distance ranges from 120mm to 200mm.

12. The power conversion device according to claim 1, wherein, The housing includes a first housing and a second housing that together form the accommodating cavity. The pouring port and the vent are both located in the first housing, and the circuit board is supported on the second housing.

13. The power conversion device according to claim 12, wherein, The second housing has an annular groove that surrounds the circuit board and engages with a flange on the first housing to accommodate sealing material.

14. The power conversion device according to claim 12, wherein, The second housing includes a limiting member for supporting the circuit board. The limiting member has a first limiting surface and a second limiting surface connected at an angle. The circuit board has a second surface opposite to the first surface. The first limiting surface abuts against the second surface in a direction perpendicular to the first surface, so that there is a gap between the circuit board and the second housing in a direction perpendicular to the first surface. The second limiting surface abuts against the circuit board in a direction perpendicular to the first surface.

15. The power conversion device according to claim 14, wherein, The limiting member is an edge limiting member, which is disposed on the edge of the second shell. The second limiting surface of the edge limiting member abuts against the edge of the circuit board, so that a flow channel connecting the gap is formed between the edge of the circuit board and the second shell.

16. The power conversion device according to claim 14, wherein, The limiting member is an intermediate limiting member, which is disposed in the middle of the second shell. The intermediate limiting member includes a support member and a column disposed in the middle of the support member. The first limiting surface of the intermediate limiting member is the upper surface of the support member, and the second limiting surface of the intermediate limiting member is the outer surface of the column. The column penetrates the circuit board.

17. The power conversion device according to claim 1, wherein, It also includes a seal for sealing the pouring port and the vent.

18. The power conversion device according to claim 1, wherein, It also includes an indicator light, which includes a light-emitting part and a sealing part. The light-emitting part is disposed on the first surface, and the sealing part covers the light-emitting part and is attached to the first surface.

19. The power conversion device according to claim 18, wherein, The indicator light also includes a light guide column, which is connected to the sealing part and is used to guide the light signal of the light-emitting part to the outer surface of the housing.

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