A power module and a fully-immersed charging system

Abstract

The application discloses a power module and a full-immersion charging system, which are applied to full-immersion oil liquid. The power module comprises a shell, a baffle and a pressing plate. The shell is provided with a display hole. The baffle is arranged on the outer side of the shell and seals the display hole. The baffle is of a transparent structure. The pressing plate is arranged on the side, away from the shell, of the baffle and is connected with the shell. The pressing plate and the shell press-bond and fix the baffle. The pressing plate is provided with a first through hole. The orthographic projection of the display hole on the pressing plate is located in the inner periphery of the first through hole or coincides with the first through hole. When the power module operates, the display lamp inside the shell emits light. The light passes through the display hole on the shell, passes through the transparent baffle and then passes through the first through hole on the pressing plate, and finally is transmitted to the outside, so that the display function is realized. Even if the sealing structure between the baffle and the shell is aged and fails, the pressing plate can press the baffle, so that the display hole is in a sealed state and the leakage of the insulating oil inside the shell is prevented.

Description

Technical Field

[0001] This application relates to the field of power module technology, and in particular to a power module and a fully immersive charging system. Background Technology

[0002] Oil-immersed power modules use insulating oil as the cooling medium, with the interior of the casing filled with insulating oil to maintain efficient heat dissipation. Compared to traditional air-cooled charging modules, they offer stronger protection and reduce the overall failure rate by more than 50%. This design overcomes the challenge of low cooling efficiency in extreme environments such as dusty conditions, high altitudes, and extreme cold and humidity.

[0003] Oil-immersed power modules typically have through holes on their housings for indicator lights located inside the housing to insert into. Tempered glass is then bonded to the outside of the housing with sealant to block the through holes and prevent the insulating oil inside the housing from leaking through them.

[0004] However, with prolonged use, the sealant comes into contact with insulating oil for extended periods. Coupled with changes in external environmental temperatures, the sealant is at risk of aging and failure, leading to leakage of oil from inside the casing. This affects the use of the power module and makes maintenance inconvenient. Utility Model Content

[0005] The main purpose of this application is to provide a power module and a fully immersion charging system, which aims to solve the problem of easy leakage in the indicator area of ​​the casing of traditional oil-immersed power modules.

[0006] To achieve the above objectives, this application provides a power module for use in fully immersed oil. The power module includes a housing, a baffle, and a pressure plate. The housing has a display hole. The baffle is located on the outside of the housing and seals the display hole. The baffle is transparent. The pressure plate is located on the side of the baffle away from the housing and is connected to the housing. The pressure plate and the housing press and fix the baffle together. The pressure plate has a first through hole. The orthographic projection of the display hole onto the pressure plate is located on the inner periphery of the first through hole or coincides with the first through hole.

[0007] Optionally, the baffle is bonded to the outside of the housing with sealant to seal the display hole.

[0008] Optionally, the sealant is fluorosilicone rubber or perfluoroether rubber.

[0009] Optionally, the outer side of the housing is provided with a dotted groove, and the sealant is disposed in the dotted groove to bond the baffle.

[0010] Optionally, the power module further includes a sealing gasket disposed between the baffle and the housing, and the sealing gasket has a second through hole; wherein, the orthographic projection of the display hole on the sealing gasket is located on the inner periphery of the second through hole or coincides with the second through hole, and the baffle seals the display hole through the sealing gasket.

[0011] Optionally, the compression amount of the sealing gasket is 'a', and 20% ≤ a ≤ 35%.

[0012] Optionally, the pressure plate is a rigid metal plate.

[0013] Optionally, the housing has a groove, and the display hole, the baffle, and the pressure plate are all disposed within the groove.

[0014] Optionally, the power module further includes countersunk screws that connect the pressure plate to the housing; wherein the baffle plate is provided with a through hole for the countersunk screws to pass through.

[0015] Furthermore, to achieve the above objectives, this application also provides a fully immersive charging system. This fully immersive charging system includes at least one charging interface, a power distribution device, at least two of the aforementioned power modules, and a controller. The power distribution device is electrically connected to each of the charging interfaces. At least two power modules are electrically connected to the power distribution device, and each power module converts AC power from the power grid into DC power, which is then supplied to the charging interface via the power distribution device. The controller is electrically connected to the power distribution device, and the controller is used to acquire the required power of each of the charging interfaces and send a scheduling command to the power distribution device based on the connection relationship of the controllable switches in the power distribution device and the required power. The power distribution device responds to the scheduling command by controlling the opening or closing of the controllable switches to distribute the output power of each power module to each of the charging interfaces.

[0016] This application provides a power module in which an indicator light inside the housing illuminates during operation. The light passes through a display hole on the housing, through a transparent baffle, and then through a first through-hole on a pressure plate, ultimately projecting to the outside to achieve the display function. The pressure plate presses the baffle tightly against the housing, ensuring that even if the sealing structure between the baffle and the housing ages or fails, the pressure plate's hold maintains a sealed display hole, preventing leakage of insulating oil from inside the housing. 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 overall structure of a power module according to an embodiment of this application; Figure 2 This is a structural breakdown diagram of an embodiment of this application. Figure 1 ; Figure 3 This is a structural breakdown diagram of an embodiment of this application. Figure 2 ; Figure 4 This is a schematic diagram of a fully immersive charging system provided in an embodiment of this application.

[0020] In the diagram: 1. Outer shell; 11. Display hole; 12. Groove; 13. Glue dispensing groove; 2. Baffle; 21. Through hole; 3. Pressure plate; 31. First through hole; 4. Sealing gasket; 41. Second through hole; 5. Countersunk screw; 110. Power module; 120. Charging interface; 130. Controller; 140. Power distribution device.

[0021] 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

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the overall structure of a power module according to an embodiment of this application; Figure 2 This is a structural breakdown diagram of an embodiment of this application. Figure 1 ; Figure 3 This is a structural breakdown diagram of an embodiment of this application. Figure 2 ; Figure 4 This is a schematic diagram of a fully immersive charging system provided in an embodiment of this application.

[0028] in, Figure 2 This diagram illustrates the structure of the power module when using sealant in conjunction with a dispensing groove. Figure 3 This shows a schematic diagram of the power module structure when a sealing gasket is used.

[0029] refer to Figures 1-3This application provides a power module for use in fully submerged oil. The power module may include a housing 1, a baffle 2, and a pressure plate 3. The housing 1 is provided with a display hole 11. The baffle 2 is disposed on the outside of the housing 1 and seals the display hole 11. The baffle 2 is a transparent structure. The pressure plate 3 is disposed on the side of the baffle 2 away from the housing 1 and is connected to the housing 1. The pressure plate 3 and the housing 1 press and fix the baffle 2 together. The pressure plate 3 is provided with a first through hole 31. The orthographic projection of the display hole 11 on the pressure plate 3 is located on the inner periphery of the first through hole 31 or coincides with the first through hole 31.

[0030] The power module proposed in this application provides an indicator light inside the housing 1 that illuminates during operation. The light passes through the display hole 11 on the housing 1, through the transparent baffle 2, and then through the first through hole 31 on the pressure plate 3, ultimately reaching the outside to achieve the display function. The pressure plate 3 presses the baffle 2 firmly against the housing 1. Even if the sealing structure between the baffle 2 and the housing 1 ages or fails, the pressure plate 3 pressing the baffle 2 ensures that the display hole 11 remains sealed, preventing leakage of insulating oil inside the housing 1.

[0031] It should be understood that the application of power modules in fully immersed oil means that the inside of the power module's casing is filled with insulating oil.

[0032] It should be noted that the interior of the outer casing 1 is filled with insulating oil. The side of the outer casing 1 that is in contact with the insulating oil is the inner side of the outer casing 1, and the side of the outer casing 1 that is exposed to the outside is the outer side of the outer casing 1.

[0033] Furthermore, the baffle 2 is fixed by the cooperation of the pressure plate 3 and the outer shell 1. The structure is simple and easy to assemble, making maintenance and repair more convenient. Moreover, the pressing effect of the pressure plate 3 enhances the connection reliability between the baffle 2 and the outer shell 1, and improves the service life of the overall module.

[0034] The baffle 2 can be made of plastic. The specific material can be selected based on the module's operating temperature and compatibility with the insulating oil liquid inside the outer shell 1. This ensures that the baffle 2 will not melt or deform due to excessive temperature, nor will it react with the insulating oil inside the outer shell 1, guaranteeing the normal operation of the baffle 2 for a long time. At the same time, the baffle 2 must also meet the transparency requirements of the display area to ensure light transmission.

[0035] It should be noted that the orthographic projection of the display hole 11 on the pressure plate 3 is located on the inner circumference of the first through hole 31 or coincides with the first through hole 31. The first through hole 31 is relatively large, so that the optical fiber projected from the display hole 11 can pass through the first through hole 31. Specifically, the first through hole 31 and the display hole 11 can be set coaxially, and the diameter of the first through hole 31 is greater than or equal to the diameter of the display hole 11.

[0036] The orthographic projection of the display hole 11 on the pressure plate 3 refers to the projection of the display hole 11 onto the plane of the side of the pressure plate 3 facing the display hole 11, along the direction perpendicular to the pressure plate 3.

[0037] It should be understood that there may be more than one indicator light. In the embodiments of this application, such as... Figure 2 As shown, there are three indicator lights, so there should also be three corresponding display holes 11, so that the three indicator lights can be set at the corresponding display holes 11; similarly, there are also three first through holes 31, so as to ensure that the optical fibers of the three indicator lights can pass through the pressure plate 3 normally.

[0038] In an exemplary embodiment, the baffle 2 is bonded to the outside of the housing 1 with sealant to seal the display hole 11.

[0039] Specifically, the sealant not only serves to fix the baffle 2, but also ensures that the display hole 11 is sealed, preventing external impurities from entering or internal insulating oil from leaking.

[0040] In addition, the pressure plate 3 cooperates with the outer shell 1 to firmly press the baffle 2. Even if the sealant ages or fails, the mechanical pressing force of the pressure plate 3 can maintain the sealing effect of the baffle 2.

[0041] When the sealant ages or fails, the pressure plate 3 can be removed, a new baffle 2 can be replaced, and the sealant can be reapplied, making maintenance simple and quick.

[0042] Furthermore, the sealant is made of fluorosilicone rubber or perfluoroether rubber. Both of these materials are high-performance sealing materials with excellent temperature resistance, aging resistance and chemical corrosion resistance. Using these two materials as sealants can significantly improve the service life of the sealant.

[0043] refer to Figure 2 In an exemplary embodiment, a dotted groove 13 is provided on the outer side of the housing 1, and sealant is disposed in the dotted groove 13 to bond the baffle 2.

[0044] Specifically, the design of the dispensing groove 13 helps to precisely control the filling position and amount of sealant, avoid sealant overflow or insufficient filling, and improve assembly accuracy and consistency.

[0045] like Figure 2 As shown in the embodiment of this application, the dispensing groove 13 is annular, and the display hole 11 is located on the inner circumference of the annular dispensing groove 13. Thus, when sealant is applied to the dispensing groove 13 and the baffle 2 is connected, the area around the display hole 11 is sealed, thereby ensuring the sealing effect.

[0046] Furthermore, there can be multiple annular dispensing grooves 13. These multiple annular dispensing grooves 13 are sequentially layered around the outer periphery of the display hole 11 to form a multi-level seal, which can further enhance the sealing effect and improve the sealing life.

[0047] refer to Figure 3 In an exemplary embodiment, the power module may further include a sealing gasket 4, which is disposed between the baffle 2 and the housing 1. The sealing gasket 4 has a second through hole 41. The orthographic projection of the display hole 11 on the sealing gasket 4 is located on the inner periphery of the second through hole 41 or coincides with the second through hole 41. The baffle 2 seals the display hole 11 through the sealing gasket 4.

[0048] Specifically, the baffle 2 can also seal the display hole 11 by setting a sealing gasket 4. The orthographic projection of the display hole 11 on the sealing gasket 4 is located on the inner circumference of the second through hole 41 or coincides with the second through hole 41. That is, the second through hole 41 is larger, so that the optical fiber projected from the display hole 11 can pass through the second through hole 41. Specifically, the second through hole 41 can be set coaxially with the display hole 11, and the diameter of the second through hole 41 is greater than or equal to the diameter of the display hole 11.

[0049] The orthographic projection of the display hole 11 onto the sealing gasket 4 refers to the projection of the display hole 11 onto the plane of the side of the sealing gasket 4 facing the display hole 11, along a direction perpendicular to the sealing gasket 4.

[0050] It should be understood that if there are three indicator lights, there should also be three corresponding display holes 11, so that the three indicator lights can be set at the corresponding display holes 11; similarly, there are also three second through holes 41, so as to ensure that the optical fibers of the three indicator lights can pass through the sealing gasket 4 normally.

[0051] Furthermore, such as Figure 2 As shown, the outer casing 1 can also be provided with an installation groove that matches the size of the sealing gasket 4. When the sealing gasket 4 is placed in the installation groove, the edge of the sealing gasket 4 fits against the edge of the installation groove. However, the thickness of the sealing gasket 4 should be greater than the depth of the installation groove to ensure that the sealing gasket 4 can be squeezed by the baffle 2 to achieve a seal.

[0052] At the same time, the installation groove can also prevent the sealing gasket 4 from moving when it is squeezed, ensuring that the display hole 11 will not be blocked by the movement of the sealing gasket 4.

[0053] In addition, the diameter of the first through hole 31 can be greater than or equal to the diameter of the second through hole 41, so as to ensure that the light transmitted through the second through hole 41 is not blocked by the first through hole 31.

[0054] Of course, in actual use, the diameter of the first through hole 31 is preferably larger than that of the second through hole 41 and the display hole 11. In this way, the light transmitted through the display hole 11 can be refracted by the transparent plastic baffle 2, and the refracted light can also pass through the first through hole 31 on the pressure plate 3. Furthermore, when selecting materials or setting the thickness of the baffle 2, a low refractive index can be used as the standard for material selection and thickness setting.

[0055] Among them, the sealing gasket 4 can be a silicone rubber sealing gasket, which has good temperature resistance, elasticity and aging resistance, further improving the sealing life.

[0056] In an exemplary embodiment, the compression amount of the sealing gasket 4 is a, and 20% ≤ a ≤ 35%.

[0057] Specifically, the compression of the sealing gasket 4 can be 20%, 25%, 30%, and 35%, etc. A reasonable compression can effectively prevent the leakage of insulating oil due to insufficient compression.

[0058] The specific compression amount can be controlled by the thickness of the sealing gasket 4 and the depth of the mounting groove. During installation, the baffle 2 can fit into the groove opening of the mounting groove. At this time, the thickness of the sealing gasket 4 is consistent with the depth of the mounting groove. Thus, the difference between the thickness of the sealing gasket 4 and the depth of the mounting groove is the deformation of the sealing gasket 4 in its own thickness direction. The compression amount is the ratio of this difference to the thickness of the sealing gasket 4 in its natural state. In this way, the compression amount of the sealing gasket 4 can be controlled by controlling the thickness of the sealing gasket 4 and the depth of the mounting groove.

[0059] Of course, if the installation groove is not used, the distance between the baffle 2 and the outer shell 1 can be changed by adjusting the tightness of the pressure plate 3, thereby further controlling the deformation of the sealing gasket 4 in its thickness direction.

[0060] In an exemplary embodiment, the pressure plate 3 is a rigid metal plate.

[0061] Specifically, using plastic for baffle 2 reduces costs and facilitates manufacturing. Due to the high protection requirements of the power module, air tightness testing is often used instead of immersion testing as the factory inspection standard in actual production. The air tightness test involves inflating the inside of the outer casing 1 to check the air tightness. The pressure plate 3 is made of rigid metal, which can effectively press the plastic baffle 2, thereby preventing the plastic baffle 2 from warping and ensuring a sealing effect.

[0062] refer to Figure 2 In an exemplary embodiment, the outer casing 1 has a groove 12, and the display hole 11, the baffle 2 and the pressure plate 3 are all disposed in the groove 12.

[0063] Specifically, such as Figure 2 As shown, after setting the groove 12, the baffle 2 and the pressure plate 3 can be set in the groove 12, which can greatly improve the aesthetics of the outer shell 1.

[0064] Furthermore, the side of the pressure plate 3 away from the baffle 2 can be flush with the groove of the recess 12, ensuring that the exterior of the outer shell 1 is flat and aesthetically pleasing.

[0065] It should be understood that the outer periphery of the pressure plate 3 fits against the side wall of the groove 12, which further ensures that the outer shell 1 is flat and aesthetically pleasing. At the same time, the pressure plate 3 almost completely blocks the opening of the groove 12, effectively preventing external impurities from entering the groove 12.

[0066] refer to Figure 2 In an exemplary embodiment, the power module may further include countersunk screws 5, which connect the pressure plate 3 and the housing 1; wherein the baffle 2 is provided with a through hole 21 for the countersunk screws 5 to pass through.

[0067] Specifically, by connecting the pressure plate 3 and the outer shell 1 with countersunk screws 5, it can be ensured that the screws will not extend beyond the side of the pressure plate 3 away from the baffle 2, further ensuring that the outer shell 1 is flat and aesthetically pleasing. In addition, the pressure plate 3 can be installed or removed by turning the screws. The structure is simple, the service life is long, and maintenance is more convenient and quick.

[0068] The baffle 2 is provided with a through hole 21 for the countersunk screw 5 to pass through, which can further restrict the position of the baffle 2 and prevent the baffle 2 from moving, thus making the module more stable.

[0069] Of course, the outer periphery of the baffle 2 can also fit against the side wall of the groove 12, which makes it easier to restrict the position of the baffle 2.

[0070] In the embodiments of this application, such as Figure 2 As shown, both the pressure plate 3 and the baffle 2 are rectangular plates, so four countersunk screws 5 can be installed. The four countersunk screws 5 are located at the four corners of the pressure plate 3 to connect the pressure plate 3 and the outer shell 1, thus stably connecting the pressure plate 3 and the baffle 2.

[0071] The clamping amount of the pressure plate 3 can be adjusted by adjusting the screwing depth of the countersunk screw 5.

[0072] In addition, there are many traditional solutions for how the countersunk screw 5 connects the pressure plate 3 and the outer shell 1, which will not be elaborated here.

[0073] refer to Figure 4Based on the above embodiments, this application provides a fully immersive charging system. This fully immersive charging system may include at least one charging interface 120, a power distribution device 140, at least two of the aforementioned power modules 110, and a controller 130. The power distribution device 140 is electrically connected to each charging interface 120. The 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 via the power distribution device 140. The controller 130 is electrically connected to the power distribution device 140 and is used to acquire the required power of each charging interface 120. Based on the connection relationship of the controllable switches in the power distribution device 140 and the required power, the controller sends a scheduling command to the power distribution device 140. 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 power module 110 to each charging interface 120.

[0074] In one optional implementation, the fully immersive charging system provided in this application is an integrated DC charging pile. The charging interface 120 is used to connect the charging gun, and the charging gun is hung on the host of the fully immersive charging system through the gun holder on the main body of the fully immersive charging system.

[0075] In one optional implementation, the fully immersive charging system provided in this application is a split-type DC charging pile. The fully immersive 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 fully immersive charging system. The charging terminals are equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0076] 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 power module, characterized in that, The power module, applicable to fully submerged oil, includes: The outer casing (1) is provided with a display hole (11); A baffle (2) is disposed on the outside of the outer shell (1) and seals the display hole (11). The baffle (2) is a transparent structure. A pressure plate (3) is disposed on the side of the baffle (2) away from the outer shell (1) and connected to the outer shell (1). The pressure plate (3) and the outer shell (1) press and fix the baffle (2). A first through hole (31) is provided on the pressure plate (3). The orthographic projection of the display hole (11) on the pressure plate (3) is located on the inner periphery of the first through hole (31) or coincides with the first through hole (31).

2. The power module as described in claim 1, characterized in that, The baffle (2) is bonded to the outside of the housing (1) with sealant to seal the display hole (11).

3. The power module as described in claim 2, characterized in that, The sealant is fluorosilicone rubber or perfluoroether rubber.

4. The power module as described in claim 2, characterized in that, The outer side of the outer shell (1) is provided with a dotted groove (13), and the sealant is disposed in the dotted groove (13) to bond the baffle (2).

5. The power module as described in claim 1, characterized in that, The power module also includes: A sealing gasket (4) is disposed between the baffle (2) and the outer shell (1), and a second through hole (41) is provided on the sealing gasket (4). The orthographic projection of the display hole (11) on the sealing gasket (4) is located on the inner periphery of the second through hole (41) or coincides with the second through hole (41), and the baffle (2) seals the display hole (11) through the sealing gasket (4).

6. The power module as described in claim 5, characterized in that, The compression amount of the sealing gasket (4) is a, and 20%≤a≤35%.

7. The power module as described in claim 1, characterized in that, The pressure plate (3) is a rigid metal plate.

8. The power module as described in claim 1, characterized in that, The outer casing (1) has a groove (12), and the display hole (11), the baffle (2) and the pressure plate (3) are all disposed in the groove (12).

9. The power module as described in claim 1, characterized in that, The power module also includes: Countersunk screws (5) connect the pressure plate (3) to the outer casing (1); The baffle (2) is provided with a through hole (21) for the countersunk screw (5) to pass through.

10. A fully immersion charging system, characterized in that, 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 power modules (110) as described in any one of claims 1 to 9 are electrically connected to the power distribution device (140), the power modules (110) being 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 respond to the scheduling command to control the opening or closing of the controllable switches to distribute the output power of each power module (110) to each of the charging interfaces (120).

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