Oil-immersed power module and charging system

Abstract

The utility model discloses an oil-immersed power module and a charging system, and relates to the technical field of charging equipment, the oil-immersed power module is immersed in oil, the oil-immersed power module comprises a printed board, a reaction element and a protective ring, the reaction element is arranged on one side of the printed board, and the reaction element comprises a reaction part; wherein the protection ring and the printed board are attached to each other and define a containing cavity, and the containing cavity is filled with an isolation material. In the oil-immersed power module provided by the invention, the protective ring can be connected around the reaction element to surround the reaction element, and then the isolation material is filled into the accommodating cavity defined by the protective ring and the printed board; when the reaction element is the electrolytic capacitor, the reaction part is the cover plate, and the isolation material can effectively and completely isolate the cover plate of the electrolytic capacitor from the heat dissipation mineral oil, so that the cover plate does not fall off when the electrolytic capacitor is soaked in the heat dissipation mineral oil for a long time, electrolyte does not leak outwards, and the electrolytic capacitor does not lose efficacy; and the working reliability of the oil-immersed power module is further improved.

Description

Technical Field

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

[0002] Traditional charging modules are air-cooled, using fans for heat dissipation. However, dust, moisture, and other impurities in the air can be carried into the module's interior by airflow during cooling, leading to malfunctions. Therefore, a fully immersion oil-cooling solution has emerged. This eliminates the traditional fan and completely submerges the internal structure of the charging module in mineral oil. The good thermal conductivity and stable cooling power of mineral oil remove the heat generated inside the module, solving the heat dissipation problem while ensuring module reliability.

[0003] The charging module typically contains an electrolytic capacitor. The electrolytic capacitor has an aluminum shell, inside which are placed cathode foil and anode foil, and filled with electrolyte, thus forming the core of the electrolytic capacitor. Finally, the aluminum shell is sealed by a cover plate.

[0004] In the above solution, the cover plate of the electrolytic capacitor reacts with the heat-dissipating mineral oil, and the cover plate is prone to swelling and falling off. This damages the airtightness of the electrolytic capacitor, allowing mineral oil to penetrate into the core of the electrolytic capacitor or the electrolyte to seep into the heat-dissipating mineral oil, further affecting the reliability of the charging module. Utility Model Content

[0005] The main objective of this application is to provide an oil-immersed power module and charging system, which aims to solve the problem of the reaction between the components in the charging module and the heat dissipation mineral oil.

[0006] To achieve the above objectives, this application provides an oil-immersed power module, which is submerged in oil. The oil-immersed power module includes a printed circuit board, a reaction element, and a protective ring. The reaction element is disposed on one side of the printed circuit board and includes a reaction portion. The protective ring is disposed on the same side of the printed circuit board as the reaction element and is located around the reaction element. The protective ring is attached to the printed circuit board and forms a receiving cavity, which is filled with a separating material used to isolate the reaction portion from the oil.

[0007] Optionally, the printed circuit board has through holes; the protective ring has a buckle corresponding to the through hole on the side facing the printed circuit board; wherein the buckles all pass through the corresponding through holes to engage the protective ring with the printed circuit board.

[0008] Optionally, there are multiple buckles, which are spaced apart in the circumferential direction of the protective ring; the through holes are corresponding to the buckles.

[0009] Optionally, the buckle includes two elastic pieces, each of which is arranged opposite to each other and has a protruding structure on one side; wherein, when the protective ring is engaged with the printed circuit board, the protruding structures are all located on the side of the printed circuit board away from the protective ring and abut against the printed circuit board.

[0010] Optionally, there are multiple reaction elements arranged closely together; the protective ring is disposed on the outer periphery of the area where the multiple reaction elements are located on the printed circuit board.

[0011] Optionally, there are multiple reaction elements, which are at least divided into multiple element groups. Each element group includes at least one reaction element, and the reaction elements in each element group are arranged closely together. The protective ring corresponds one-to-one with the element group and is disposed on the outer periphery of the area where the corresponding element group is located on the printed circuit board.

[0012] Optionally, the side of the printed circuit board facing the protective ring is a first side surface, the distance between the side of the protective ring away from the printed circuit board and the first side surface is a, the maximum distance between the reaction part and the first side surface is b, and a > b.

[0013] Optionally, the reaction element is an electrolytic capacitor, and the reaction site is the cover plate of the electrolytic capacitor.

[0014] Optionally, the insulating material is polyurethane adhesive.

[0015] To achieve the above objectives, this application also provides a charging system, which includes at least one charging interface, a power distribution device, at least two of the aforementioned oil-immersed power modules, and a controller. The power distribution device is electrically connected to each of the charging interfaces. Each oil-immersed power module is electrically connected to the power distribution device and is used to convert AC power from the power grid into DC power, which is then supplied to the charging interface through the power distribution device. The controller is electrically connected to the power distribution device and is used to acquire the required power of each of the charging interfaces. Based on the connection relationship of the controllable switches in the power distribution device and the required power, the controller sends a scheduling command to the power distribution device. The power distribution device is used to control the opening or closing of the controllable switches in response to the scheduling command, so as to distribute the output power of each of the oil-immersed power modules to each of the charging interfaces.

[0016] This application proposes an oil-immersed power module in which a protective ring is connected around the reactive element to surround it, and then an insulating material is added into the cavity formed by the protective ring and the printed circuit board. When the reactive element is an electrolytic capacitor, the reactive part is the cover plate. The insulating material can effectively isolate the cover plate of the electrolytic capacitor from the heat-dissipating mineral oil, so that the cover plate will not fall off when the electrolytic capacitor is immersed in the heat-dissipating mineral oil for a long time, ensuring that the electrolyte does not leak out and the electrolytic capacitor does not fail, thereby further improving the reliability of the oil-immersed power module. Attached Figure Description

[0017] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 This is a schematic diagram of the internal structure of an oil-immersed power module provided in an embodiment of this application;

[0020] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the printed circuit board in the embodiment;

[0021] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0022] Figure 4 This is a schematic diagram of the protective ring structure in an embodiment of this application;

[0023] Figure 5 for Figure 4 Enlarged view of the structure at point B in the middle;

[0024] Figure 6 This is a schematic diagram of an overall charging system provided in an embodiment of this application.

[0025] In the diagram: 1. Printed circuit board; 11. Through hole; 2. Reactor element; 3. Protective ring; 31. Snap-fit; 110. Oil-immersed power module; 120. Charging interface; 130. Controller; 140. Power distribution device.

[0026] 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

[0027] 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.

[0028] 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.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" 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.

[0030] 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. 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.

[0031] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Figure 1This is a schematic diagram of the internal structure of an oil-immersed power module provided in an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the printed circuit board in the embodiment; Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0033] Figure 4 This is a schematic diagram of the protective ring structure in an embodiment of this application; Figure 5 for Figure 4 Enlarged view of the structure at point B in the middle; Figure 6 This is a schematic diagram of an overall charging system provided in an embodiment of this application.

[0034] refer to Figures 1-5 This application provides an oil-immersed power module, which is submerged in oil. The oil-immersed power module may include a printed circuit board 1, a reaction element 2, and a protective ring 3. The reaction element 2 is disposed on one side of the printed circuit board 1 and includes a reaction portion. The protective ring 3 is disposed on the same side of the printed circuit board 1 as the reaction element 2 and is located around the reaction element 2. The protective ring 3 is attached to the printed circuit board 1 and forms a receiving cavity, which is filled with an isolation material used to isolate the reaction portion from the oil.

[0035] The oil-immersed power module proposed in this application embodiment can be surrounded by a protective ring 3, and then an insulating material is added into the cavity formed by the protective ring 3 and the printed circuit board 1. When the reactive element 2 is an electrolytic capacitor, the reactive part is the cover plate. The insulating material can effectively isolate the cover plate of the electrolytic capacitor from the heat dissipation mineral oil, so that the cover plate will not fall off when the electrolytic capacitor is immersed in the heat dissipation mineral oil for a long time, ensuring that the electrolyte does not leak out and the electrolytic capacitor does not fail, thereby further improving the reliability of the oil-immersed power module.

[0036] The insulating material can be polyurethane adhesive; polyurethane adhesive has extremely strong acid and alkali resistance and temperature adaptability, can maintain stable performance under harsh climatic conditions, and resists chemical corrosion, making it suitable for long-term use.

[0037] Additionally, the reactive element 2 here refers to components that require isolation and sealing, such as components that react with thermal mineral oil, which then need to be isolated and sealed.

[0038] It should be understood that the fit between the protective ring 3 and the printed circuit board 1 can improve the sealing of the cavity and prevent polyurethane glue from flowing out of the inner circumference of the protective ring 3 from the gap between the protective ring 3 and the printed circuit board 1 during polyurethane potting.

[0039] It should be noted that the protective ring 3 can be made of plastic, which is lightweight and has a low manufacturing cost. After potting is completed, the protective ring 3 can be removed or left on the printed circuit board 1 to further enhance the isolation effect.

[0040] In an exemplary embodiment, the side of the printed circuit board 1 facing the protective ring 3 is the first side surface, the distance between the side of the protective ring 3 away from the printed circuit board 1 and the first side surface is a, the maximum distance between the reaction part and the first side surface is b, and a > b.

[0041] Specifically, 'a' refers to the distance between the side of the protective ring 3 facing away from the printed circuit board 1 and the first side surface in the thickness direction of the printed circuit board 1; 'b' refers to the maximum distance between all points on the reaction part and the first side surface in the thickness direction of the printed circuit board 1.

[0042] If the printed circuit board 1 is laid flat, then a > b can be understood as the height of the protective ring 3 being greater than the height of the highest point on the reaction site. In other words, the reaction site will be completely inside the containment cavity. Thus, when the containment cavity is filled with isolation material, the isolation material can completely cover the reaction site, ensuring the isolation effect.

[0043] Of course, the height of the protective ring 3 can be directly higher than the height of the reaction element 2, which will inevitably completely isolate the reaction area. However, completely enclosing the reaction element 2 in the isolation material may have a certain impact on the heat dissipation or other effects of the reaction element 2. The height of the protective ring 3 can be determined according to the specific type of reaction element 2.

[0044] It should be understood that there may be multiple reaction sites on the same reaction element 2. In this case, the height of the protective ring 3 should be such that each reaction site is completely inside the containment cavity. In this way, when the containment cavity is filled with isolation material, the isolation material can completely cover each reaction site, ensuring the isolation effect of the reaction element 2.

[0045] In an exemplary embodiment, the reactive element 2 is an electrolytic capacitor, and the reactive part is the cover plate of the electrolytic capacitor. When the electrolytic capacitor is connected to the printed circuit board 1, the cover plate of the electrolytic capacitor is located at the end of the electrolytic capacitor closest to the printed circuit board 1. At this time, the height of the protective ring 3 is sufficient to ensure that the cover plate is located within the receiving cavity. Figure 2 As shown, when polyurethane glue is poured into the cavity, the cover plate can be completely isolated from the heat dissipation mineral oil, which effectively solves the sealing problem of electrolytic capacitors in a fully immersed working environment. The electrolytic capacitors will not fail due to electrolyte leakage, thus affecting the normal operation of the oil-immersed power module.

[0046] refer to Figure 3In an exemplary embodiment, the printed circuit board 1 has a through hole 11; the protective ring 3 is provided with a buckle 31 corresponding to the through hole 11 on the side facing the printed circuit board 1; wherein the buckle 31 passes through the corresponding through hole 11 to engage the protective ring 3 with the printed circuit board 1.

[0047] Specifically, before connecting the protective ring 3, a through hole 11 needs to be made at the corresponding position on the printed circuit board 1. When installing the protective ring 3, the buckle 31 on the protective ring 3 can be engaged with the corresponding through hole 11 on the printed circuit board 1. The installation is convenient and quick, and no additional installation tools are required.

[0048] The specific dimensions of the buckle 31 and the through hole 11 can be adjusted according to the actual situation. For example, when the protective ring 3 is large, the buckle 31 and the through hole 11 can be appropriately enlarged to ensure the stability of the connection.

[0049] It should be understood that when the buckle 31 engages with the through hole 11, the protective ring 3 is in contact with the printed circuit board 1.

[0050] refer to Figure 3 In an exemplary embodiment, there are multiple buckles 31, which are spaced apart in the circumferential direction of the protective ring 3; the through holes 11 are correspondingly provided with the buckles 31. By setting multiple buckles 31 and multiple through holes 11 to engage with each other, the stability of the protective ring 3 after engaging with the printed circuit board 1 can be further increased.

[0051] It should be noted that each through hole 11 is recorded as a hole group, that is, the protective ring 3 corresponds to a hole group, and the buckle 31 on the protective ring 3 corresponds one-to-one with the through hole 11 in the hole group; of course, one protective ring 3 can correspond to multiple hole groups, so the position of the protective ring 3 can be adjusted by connecting the protective ring 3 with different hole groups. Among them, the through holes 11 in multiple hole groups can be partially repeated.

[0052] refer to Figures 3-5 In an exemplary embodiment, the buckle 31 may include two elastic pieces, each of which is arranged opposite to each other and has a protruding structure on one side; wherein, when the protective ring 3 is engaged with the printed circuit board 1, the protruding structures are all located on the side of the printed circuit board 1 away from the protective ring 3 and abut against the printed circuit board 1.

[0053] Specifically, such as Figure 3 As shown, at this time, the buckle 31 engages with the through hole 11, and the protruding structures are all located on the side of the printed circuit board 1 away from the protective ring 3 and abut against the printed circuit board 1, thus restricting the movement of the protective ring 3 in the direction perpendicular to the printed circuit board 1; furthermore, as Figure 4 As shown, the two elastic pieces in the same buckle 31 are oriented in the same direction as the circumference of the protective ring 3. The combination of multiple buckles 31 arranged around the ring and the through hole 11 can greatly reduce the shaking of the protective ring 3 on the first side, resulting in better performance.

[0054] Furthermore, such as Figure 3 As shown, within the same buckle 31, the two protruding structures have a slope on their opposite sides. The two slopes are arranged opposite each other and approach each other in the direction away from the protective ring 3. The distance between the two slopes approaching each other is less than the diameter of the through hole 11, and the distance between the two slopes away from each other is greater than the diameter of the through hole 11. When installing the protective ring 3, the buckle 31 is directly inserted into the through hole 11. The through hole 11 contacts the two slopes within the same buckle 31 and pushes the two elastic pieces closer together, causing deformation. This makes the distance between the two slopes away from each other less than the diameter of the through hole 11, allowing the buckle 31 to pass through the through hole 11. After the two protruding structures pass through the through hole 11, the two elastic pieces return to their original deformation. At this point, the distance between the two slopes away from each other is greater than the diameter of the through hole 11, causing the protruding structures to abut against the printed circuit board 1 in the thickness direction, thus achieving a snap-fit.

[0055] It should be understood that when the protective ring 3 needs to be removed, pinching the two protruding structures inside the same buckle 31 will bring the two elastic pieces closer together, and then the buckle 31 can be pulled out from the through hole 11.

[0056] refer to Figure 1 In an exemplary embodiment, there are multiple reaction elements 2, which are arranged closely together; a protective ring 3 is disposed on the outer periphery of the area where the multiple reaction elements 2 are located on the printed circuit board 1.

[0057] Specifically, if there are multiple reaction elements 2 and they are closely arranged in a region, such as Figure 1 As shown, only one protective ring 3 is needed at this time. One protective ring 3 surrounds all the multiple reaction elements 2, and each reaction part on each reaction element 2 should be located in the receiving cavity. This facilitates the filling and sealing of isolation material and ensures that the reaction element 2 can work normally.

[0058] In an exemplary embodiment, there are multiple reaction elements 2, which are at least divided into multiple element groups. Each element group may include at least one reaction element 2, and the reaction elements 2 in each element group are arranged closely together. The protective ring 3 corresponds to each element group and is disposed on the outer periphery of the area where the corresponding element group is located on the printed circuit board 1.

[0059] Specifically, multiple reaction elements 2 have multiple closely arranged regions. Each reaction element 2 in each region is called an element group. Each element group is equipped with a protective ring 3. Furthermore, each reaction part in the same element group should be located in the corresponding receiving cavity to ensure that the reaction element 2 can work normally.

[0060] It should be understood that, taking two reaction elements 2 and one other element as an example, if there is another element between the two reaction elements 2 and the two reaction elements 2 share a protective ring 3 for potting, it will inevitably lead to the other element also being potted. If the potting has no effect on the other element (does not affect its normal operation), then the two reaction elements 2 can share a protective ring 3. If the potting affects the other element, then the two reaction elements 2 should each be potted with a separate protective ring 3.

[0061] Furthermore, to facilitate potting, components within the same component group can be of the same type, for example... Figure 1 As shown, if Figure 1 If multiple reaction elements 2 within the middle protective ring 3 are considered as a group of elements, then all reaction elements 2 within this group are electrolytic capacitors. In this way, dividing the same type of closely arranged reaction elements 2 into a group of elements makes it easier to select the protective ring 3, so that each reaction part within the same group can be placed in the receiving cavity.

[0062] refer to Figure 6 Based on the above embodiments, this application provides a charging system that may include at least one charging interface 120, a power distribution device 140, at least two of the aforementioned oil-immersed power modules 110, and a controller 130. The power distribution device 140 is electrically connected to each charging interface 120. The oil-immersed power modules 110 are electrically connected to the power distribution device 140 and are used to convert AC power from the power grid into DC power, which is then supplied to the charging interface 120 through the power distribution device 140. The controller 130 is electrically connected to the power distribution device 140 and is used to obtain the required power of each charging interface 120 and send a scheduling command to the power distribution device 140 based on the connection relationship of the controllable switches in the power distribution device 140 and the required power. The power distribution device 140 is used to control the opening or closing of the controllable switches in response to the scheduling command, so as to distribute the output power of each oil-immersed power module 110 to each charging interface 120.

[0063] 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.

[0064] 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.

[0065] 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. An oil-immersed power module, characterized by, The oil-immersed power module is submerged in oil, and the oil-immersed power module includes: Printed circuit board (1); A reaction element (2) is disposed on one side of the printed circuit board (1), and the reaction element (2) includes a reaction site; The protective ring (3) is disposed on the same side of the printed circuit board (1) as the reaction element (2) and is located around the reaction element (2); The protective ring (3) is attached to the printed circuit board (1) and forms a cavity. The cavity is filled with a separating material, which is used to separate the reaction site from the oil.

2. The oil-immersed power module of claim 1, wherein, The printed circuit board (1) has through holes (11); The protective ring (3) is provided with a buckle (31) corresponding to the through hole (11) on the side facing the printed circuit board (1); The buckles (31) all pass through the corresponding through holes (11) to engage the protective ring (3) with the printed circuit board (1).

3. The oil-immersed power module of claim 2, wherein, There are multiple buckles (31), and they are spaced apart in the circumferential direction of the protective ring (3); The through hole (11) is provided correspondingly to the buckle (31).

4. The oil-immersed power module of claim 2, wherein, The buckle (31) includes: The two elastic sheets, which are arranged opposite each other and have raised structures on their opposite sides; When the protective ring (3) is engaged with the printed circuit board (1), the protruding structures are all located on the side of the printed circuit board (1) away from the protective ring (3) and in contact with the printed circuit board (1).

5. The oil-immersed power module of claim 1, wherein, There are multiple reaction elements (2), and the multiple reaction elements (2) are arranged closely together; The protective ring (3) is disposed on the outer periphery of the area where the plurality of reaction elements (2) are located on the printed circuit board (1).

6. The oil-immersed power module of claim 1, wherein, There are multiple reaction elements (2), and the multiple reaction elements (2) are divided into at least multiple element groups. Each element group includes at least one reaction element (2), and the reaction elements (2) in each element group are arranged closely together. The protective ring (3) corresponds one-to-one with the component group and is located on the outer periphery of the area where the corresponding component group is located on the printed circuit board (1).

7. The oil-immersed power module of claim 1, wherein, The side of the printed circuit board (1) facing the protective ring (3) is the first side surface. The distance between the side of the protective ring (3) away from the printed circuit board (1) and the first side surface is a. The maximum distance between the reaction part and the first side surface is b, and a > b.

8. The oil-immersed power module of claim 1, wherein, The reaction element (2) is an electrolytic capacitor, and the reaction site is the cover plate of the electrolytic capacitor.

9. The oil-immersed power module of claim 1, wherein, The insulating material is polyurethane adhesive.

10. A charging system, characterized by include: At least one charging port (120); The power distribution device (140) is electrically connected to each of the charging interfaces (120); At least two oil-immersed power modules (110) as described in any one of claims 1 to 9 are electrically connected to the power distribution device (140), and the oil-immersed power modules (110) are used to convert AC power from the power grid into DC power and provide it to the charging interface (120) through the power distribution device (140); A controller (130) is electrically connected to the power distribution device (140). The controller (130) is used to obtain the required power of each of the charging interfaces (120) and send a scheduling command to the power distribution device (140) based on the connection relationship of the controllable switches in the power distribution device (140) and the required power of each interface. The power distribution device (140) is used to control the opening or closing of the controllable switches in response to the scheduling command, so as to distribute the output power of each of the oil-immersed power modules (110) to each of the charging interfaces (120).

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