Power conversion device and energy storage device

Abstract

A power conversion device and an energy storage device relate to the technical field of heat dissipation of energy storage devices, and comprise a shell and a fan cover located outside the shell, a power cavity is arranged in the shell, and a power device is arranged in the power cavity; an air inlet, a heat dissipation cavity and an air outlet of the fan cover are sequentially communicated to form a ventilation air channel, a second back plate of the fan cover is a sealing plate to isolate the heat dissipation cavity from discharging air in the direction from the first back plate to the second back plate, a partition piece in the fan cover divides the heat dissipation cavity into a first heat dissipation cavity and a second heat dissipation cavity, and the heat dissipation device is located in the first heat dissipation cavity. The first heat dissipation cavity and the second heat dissipation cavity are isolated on the side close to the air inlet, and the first heat dissipation cavity and the second heat dissipation cavity are communicated on the side away from the air inlet. According to the fan cover, hot air exhausted by the heat dissipation cavity can be prevented from flowing back to the air inlet, steering of heat dissipation air in the heat dissipation cavity is achieved through the partition piece, and therefore the air outlet with the larger air outlet area in the fan cover can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of heat dissipation of energy storage devices, and in particular to a power conversion device and an energy storage device. Background Art

[0002] With the development of the new energy industry, the power of power conversion equipment and other devices continues to increase, and the power consumption of their internal components is also increasing. For example, the insulated gate bipolar transistor (IGBT), a key component for energy conversion and transmission in power conversion modules, accounts for more than two-thirds of the total heat generated by the components within power conversion equipment and other devices, making it a bottleneck device that restricts module power growth. As the power and power density of energy storage converters increase, the heat generation and heat dissipation density of on-board components, single-board current flow, and cables within the energy storage converter chassis are also increasing. Components susceptible to heat, such as electrolytic capacitors, are located within the chassis. The temperature rise within the chassis directly determines the lifespan of these components, thereby affecting the lifespan and failure rate of the energy storage converter.

[0003] However, current power conversion equipment designs require that all cooling air must pass through the radiator before being discharged through the outlet. However, the side panels of current power conversion equipment where the outlets are located have many limitations. For example, the top panel lacks an outlet to prevent rain and dust, and the back panel lacks an outlet to prevent hot air backflow. Therefore, increasing the outlet area to improve heat dissipation efficiency in current power conversion equipment increases the device's size, creating a conflict between the requirements for heat dissipation efficiency and device size. Utility Model Content

[0004] The present application provides a power conversion device and an energy storage device, which provides a second backplate on one side of the heat dissipation cavity and divides the cavity into two spaces by a partition provided in the heat dissipation cavity. This not only compresses the area of ​​the front air outlet, but also does not require too much space above the radiator to correspond to the larger air outlet area on the side, thereby reducing the overall volume of the device.

[0005] In a first aspect, the present application provides a power conversion device, comprising a shell, a first fan, a first air duct plate, a radiator and a wind cover located outside the shell, wherein the shell encloses a power cavity, a circuit board is provided in the power cavity, and a power device is provided on the circuit board; the shell comprises a first back plate, the wind cover and the shell enclose a heat dissipation cavity, the radiator is located in the heat dissipation cavity and is thermally connected to the power device; the wind cover comprises two first side plates and a second back plate, the first air duct plate is located between the first back plate and the second back plate and is connected to the first back plate and the second back plate. They are arranged in parallel, with a return air channel between the first air duct plate and the top plate of the air hood, and the two first side panels are arranged opposite to each other, each of the first side panels is connected between the first back panel and the second back panel, and each of the first side panels is provided with a first air outlet; an air inlet is provided on the air hood, and the first fan is located inside the air hood. When the first fan is working, at least part of the air entering from the air inlet flows through the space between the first air duct plate and the first back panel, the return air channel and the space between the first air duct plate and the second back panel in sequence, and is discharged from the first air outlet.

[0006] The power conversion device described in the embodiment of the present application forms a heat dissipation cavity by providing a hood, and a power device is installed on the side of the circuit board installed in the power cavity of the housing facing the hood. The power device can transfer heat to the radiator in the heat dissipation cavity. The radiator is placed in the heat dissipation cavity, and the heat dissipation cavity can take in air from the bottom. The incoming air can pass through the radiator to reduce the temperature of the radiator, thereby cooling the power device. In addition, the hot air after heat exchange will not be blown out from the space between the hood and another power conversion device, which can prevent the exhausted hot air from flowing back to the air inlet through the space, thereby preventing the heat dissipation efficiency of the power conversion device from being reduced due to the backflow of hot air.

[0007] In this embodiment, a partition is provided to separate the heat dissipation chamber into a first heat dissipation chamber and a second heat dissipation chamber. Heat dissipation air flowing in the first heat dissipation chamber along the Z direction, after undergoing heat exchange through the radiator, enters the second heat dissipation chamber and is ultimately discharged through the first air outlets on both sides. In this embodiment, the projection of the first air outlet along the X direction can partially overlap with the projection of the radiator. This increases the air outlet area of ​​the first air outlet while minimizing the need for a large spacing between the radiator and the top plate of the enclosure on the Z direction side. After fully passing through the radiator, the heat dissipation air can partially enter the lower portion of the first air outlet through the second heat dissipation chamber. This ensures efficient heat dissipation of the heat dissipation chamber from the radiator, while increasing the area of ​​the first air outlet without increasing the volume of the air hood. Furthermore, this embodiment allows the hot air in the heat dissipation chamber to be discharged through the second heat dissipation chamber to the portion opposite the Z direction of the first air outlet, thereby increasing the effective air outlet area of ​​the first air outlet and thereby improving the heat dissipation efficiency of the power conversion device. This application can not only compress the area of ​​the front air outlet (towards the side of the shell), but also does not require too much space above the radiator to correspond to the side air outlet, so as to reduce the overall volume of the device, and there will be no air outlet between the back and other vertical panels, which will not cause hot air backflow.

[0008] Some possible implementations include an air concentrator connected to the first air duct plate, the first side plate, and the second back plate. When the first fan is operating, all air entering through the air inlet flows directly into the space between the first air duct plate and the first back plate. The air concentrator can separate the heat dissipation chamber into an inlet chamber and a heat exchange chamber. The inlet chamber and the first heat dissipation chamber in the heat exchange chamber are connected through ventilation holes. Low-temperature gas in the inlet chamber cannot directly enter the second heat dissipation chamber, but can only pass through the first heat dissipation chamber and exchange heat with the radiator in the first heat dissipation chamber before entering the second heat dissipation chamber.

[0009] In some possible implementations, the first fan is located in the inlet cavity, and can increase the air circulation rate in the heat dissipation cavity.

[0010] In some possible implementations, it includes a second air duct plate, two second side panels and a sealing plate, the second air duct plate is located between the first air duct plate and the second back panel and is arranged parallel to the first air duct plate, the two second side panels are arranged opposite to each other, the sealing plate connects the top of the first air duct plate and the side of the second air duct plate facing the first air duct plate, each of the second side panels is connected between the first back panel and the second air duct plate and is connected to the side of the first air duct plate and the side of the sealing plate.

[0011] In the embodiment of the present application, a heat-insulating cavity is formed, and the heat-insulating cavities can be sealed and isolated by a sealing plate and a return air channel, so that the first heat-dissipating cavity and the second heat-dissipating cavity are separated by a heat-insulating cavity. The hot air circulating in the second heat-dissipating cavity will not transfer heat to the first heat-dissipating cavity, thereby preventing the hot air circulating in the second heat-dissipating cavity from reducing the heat dissipation efficiency of the first heat-dissipating cavity to the radiator.

[0012] In some possible implementations, the air duct plate and the air collecting plate are an integrated structure, which is beneficial for the installation of the partition in the air hood and simplifies the installation process.

[0013] In some possible implementations, a guide member is included, which is located between the second air duct plate and the second back plate and between the second side plate and the first side plate. The guide member has a first guide surface. The air entering the space between the second air duct plate and the second back plate from the return air channel is accelerated to flow toward the first air outlet after flowing through the first guide surface, and can guide the hot air entering the second heat dissipation cavity to the second air outlets on both sides.

[0014] In some possible implementations, the plane on which the first guide surface lies is an inclined surface that forms an upwardly facing acute angle with the nearest first side panel; alternatively, the first guide surface is an arcuate surface comprising multiple cut surfaces that form upwardly facing acute angles with the nearest first side panel. The upwardly inclined first air guide surface can better guide air flowing from the return air duct into the second heat dissipation cavity to the two first air outlets on either side.

[0015] In some possible implementations, the guide member has a second guide surface that is flush with the lower edge of the first air outlet. The second guide surface can guide air flowing from the return air duct into the second heat dissipation cavity to the two first air outlets on either side, while also preventing air from flowing through the second heat dissipation cavity from flowing downward, thereby increasing the flow rate from the second heat dissipation cavity to the two first air outlets on either side.

[0016] In some possible implementations, the air duct plate and the wind collecting plate are sealed to prevent the wind entering through the air inlet from directly entering the second heat dissipation cavity. The air inlet can only enter the second heat dissipation cavity through the first heat dissipation cavity.

[0017] In some possible implementations, an air guide plate is provided at the air outlet, and the air guide plate is inclined along the air outlet direction of the air outlet toward a side away from the air inlet, further preventing the hot air discharged from the first air outlet from flowing back into the air inlet.

[0018] In some possible implementations, a filter is provided at the air outlet, and the filter covers at least a portion of the air outlet. The filter can prevent some impurities from entering the heat dissipation cavity through the air outlet.

[0019] In some possible implementations, the power conversion device also includes a mounting plate, the shell and the mounting plate are fixedly connected, the number of the power conversion devices is at least two, and the corresponding two adjacent mounting plates are arranged in parallel and spaced apart, and there is a spacing space between the wind hood installed on one of the two adjacent mounting plates and the other mounting plate, and the second back plate of the wind hood isolates the heat dissipation cavity in the wind hood from discharging air to the spacing space.

[0020] In some possible implementations, the power conversion device is a photovoltaic inverter, which is used to be connected in series with a photovoltaic panel and an AC combiner box. The photovoltaic inverter is used to convert the variable DC voltage of the photovoltaic panel into AC power at a mains frequency and transmit it to the AC combiner box.

[0021] In some possible implementations, the air inlet has an air inlet direction of a first direction, the side edge of the first air outlet on the side opposite to the first direction is located on the side edge of the radiator on the side of the first direction, close to the air inlet, and the area of ​​the first air outlet provided on a single first side panel is greater than half the area of ​​the single first side panel. The second back panel of the present application can isolate the heat dissipation cavity from air outlet in the direction opposite to the Y direction, and the area of ​​the second air outlet should not be too large to prevent the air hood from being too large. This embodiment achieves a balance between air inlet and outlet of the heat dissipation cavity by limiting the first air outlet to have a larger air outlet area to match the air inlet with a larger air inlet area.

[0022] In some possible implementations, the top plate of the hood is higher than the top plate of the housing, and a second air outlet is provided between the top plates of the hood and the housing. To prevent the hood from being too large and to better match the dimensions of the housing, the height of the hood protruding from the housing should not be too great. The second air outlet can be formed into a slit-like structure, so that hot air after heat exchange in the heat dissipation chamber can be discharged through the second air outlet to one side of the hood in the Y direction, ensuring that the heat dissipation chamber has a sufficient air outlet area.

[0023] In a second aspect, the present application provides an energy storage device, comprising a container, a battery device, and a power conversion device as described in any one of the above items, wherein the power conversion device is an energy storage inverter, and the number of the battery devices is multiple to form a battery cluster, the energy storage inverter and the battery cluster are electrically connected, and the energy storage inverter and the battery cluster are both located in the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the four-sided air outlet of the energy storage device provided in the embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the air ducts on all four sides of the energy storage device provided in the embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of a power conversion device provided in an embodiment of the present application. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of a power conversion device provided in an embodiment of the present application. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of a power conversion device provided in an embodiment of the present application. Figure 3 ;

[0029] Figure 6 This is a schematic diagram of a power conversion device provided in an embodiment of the present application. Figure 4 ;

[0030] Figure 7 This is a schematic diagram of the interior of the heat dissipation cavity provided in an embodiment of the present application;

[0031] Figure 8 is a cross-sectional view of the power conversion device provided in an embodiment of the present application on the YZ plane;

[0032] Figure 9 Schematic diagram of a heat exchanger provided in an embodiment of the present application;

[0033] Figure 10 yes Figure 9 AA section view in;

[0034] Figure 11 This is a schematic diagram of three-sided air outlet ducts of multiple power conversion devices provided in an embodiment of the present application;

[0035] Figure 12 is a schematic diagram of a separator provided in an embodiment of the present application;

[0036] Figure 13 is a cross-sectional view of a power conversion device with a separator provided in an embodiment of the present application, taken along the YZ plane;

[0037] Figure 14 is a schematic diagram of a heat dissipation cavity in a power conversion device provided in an embodiment of the present application;

[0038] Figure 15 This is a schematic diagram of the separator provided in the embodiment of the present application. Figure 1 ;

[0039] Figure 16 Schematic diagram of a heat exchanger provided in an embodiment of the present application;

[0040] Figure 17 This is a schematic diagram of the air duct flow in the heat exchanger provided by the embodiment of the present application;

[0041] Figure 18 This is a schematic diagram of a separator provided by an embodiment of the present application having a double-layer third back plate;

[0042] Figure 19 is a YZ-plane cross-sectional view of a double-layer third backplane provided in an embodiment of the present application;

[0043] Figure 20 This is a schematic diagram of a separator provided by an embodiment of the present application having a double-layer third back plate;

[0044] Figure 21 1 is an exploded schematic diagram of a separator provided in an embodiment of the present application having a double-layer third back plate;

[0045] Figure 22 This is a schematic diagram of a heat dissipation cavity partition provided by an embodiment of the present application having a double-layer third back plate;

[0046] Figure 23 Schematic diagram of the first sealing plate and the second sealing plate on the separator provided in an embodiment of the present application;

[0047] Figure 24 Schematic diagram of the second heat-insulating cavity between the second side panel and the third side panel provided in an embodiment of the present application;

[0048] Figure 25 This is a schematic diagram of the guide member in the heat dissipation cavity provided in the embodiment of the present application. Figure 1 ;

[0049] Figure 26 This is a schematic diagram of the guide member in the heat dissipation cavity provided in the embodiment of the present application. Figure 2 ;

[0050] Figure 27 This is a schematic diagram of the guide member in the heat dissipation cavity provided in the embodiment of the present application. Figure 3 ;

[0051] Figure 28 This is a schematic diagram of the guide member in the heat dissipation cavity provided in the embodiment of the present application. Figure 4 ;

[0052] Figure 29 This is a schematic diagram of the second air guide surface and the second air outlet provided in an embodiment of the present application being flush with each other;

[0053] Figure 30 This is a schematic diagram of an air deflector provided in an embodiment of the present application;

[0054] Figure 31 is a schematic diagram of an energy storage device provided in an embodiment of the present application;

[0055] Figure 32 is a schematic diagram of another energy storage device provided in an embodiment of the present application;

[0056] Figure 33 This is a schematic diagram of an energy storage container provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0058] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0059] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0060] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0061] It should be understood that the term "and / or" as used herein is simply a term used to describe the existence of three possible relationships between related objects. For example, "A and / or B" can represent the existence of A alone, the existence of both A and B, and the existence of B alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0062] It should be understood that the terms “first”, “second”, etc. used in this application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0063] In the description of this application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this application.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0065] The present application provides a power conversion device, see Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 An energy storage device is shown, wherein the energy storage device includes a power conversion device 10. The power conversion device 10 is described by taking an energy storage converter as an example. In common application scenarios, the power conversion device 10 is mostly arranged in a matrix, for example Figure 1 As shown, 10 power conversion devices 10 are used as an example, comprising two groups of components, which are arranged at intervals along the X direction. Each group of components comprises five power conversion devices 10, which are arranged at intervals along the Y direction.

[0066] Among them, see Figure 1 and Figure 2 As shown, the power conversion device 10 can be installed on the mounting plate 20. Figure 1 The specific method of installing the vertical plate 20 is only shown as an example. During assembly, the vertical plate 20 can be set upright relative to the ground, and the power conversion device 10 can be fixed on the vertical plate 20 by bolts or other connecting parts to realize a vertical installation of the energy storage device. Figure 1 and Figure 2 As shown, the power conversion device 10 may be provided with air outlets 222 on the four sides near the top (one end in the Z direction). Figure 1 Only two air outlets 222 are shown, one on the opposite side of the X direction and the other on the opposite side of the Y direction. An air outlet symmetrical to the opposite side of the X direction can be set on one side of the X direction, and an air outlet symmetrical to the opposite side of the Y direction can be set on one side of the Y direction.

[0067] Among them, see Figure 2As shown, among the two adjacent power conversion devices 10, for the power conversion device 10 located on one side of the Y direction, its air outlet on the opposite side of the Y direction will discharge air to the opposite side of the Y direction, and the air outlet in this direction will enter the interval space 101 between the two adjacent power conversion devices 10, and be blocked and turned by the mounting plate 20 located on the opposite side of the Y direction. A part of it flows directly in the opposite direction of the Z direction, passes through the interval space 101 and flows out on the opposite side of the Z direction, and flows back to the air inlet 221 at the bottom of the power conversion device 10. The high-temperature gas discharged from the air outlet 222 flows back to the heat dissipation cavity of the power conversion device 10 through the air inlet 221, causing the temperature of the heat dissipation air in the heat dissipation channel to increase, thereby reducing the heat dissipation effect in the heat dissipation cavity. Even more, another part of the wind from the air outlet 222 can be diverted through the mounting plate 20 and flow out in the Z direction. When the power conversion devices 10 can be arranged in multiple layers in the Z direction, the high-temperature gas flowing out in the Z direction may enter the air inlet 221 of the power conversion device 10 arranged in the upper layer, thereby reducing the heat dissipation efficiency of the upper power conversion device 10. In one embodiment, refer to Figure 2 As shown, among the five power conversion devices 10, the rightmost power conversion device 10 (the end in the opposite direction of the Y direction) does not have a mounting plate 20 on its right side, so the above problem may not occur. However, the above problem may also occur in an application scenario where the rightmost power conversion device 10 (the end in the opposite direction of the Y direction) is against a wall or close to other equipment on its right side.

[0068] Therefore, when the power conversion device 10 is installed in an application environment with a separation space 101 between its right air outlet and an environmental structure, there is a problem that the outlet air may cause hot air backflow through the separation space 101, thereby reducing the heat dissipation efficiency of the power conversion device 10. It should be noted that the environmental structure can be the mounting plate 20 of another power conversion device 10 on the right side, or it can be a structure such as a wall that forms a separation space 101 with the power conversion device 10.

[0069] Power conversion equipment can remove the air vents on the backplane side (the backplane on the side opposite to the Y direction) to prevent hot air backflow. However, removing the air vents on the backplane side will increase the air vent area, especially on the front side (one side in the Y direction) and the left and right sides (the X direction and the direction opposite to the X direction), which will increase the overall height of the equipment.

[0070] In order to solve the above problems, the present application provides a specific embodiment of a power conversion device, see Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 12 、 Figure 13 and Figure 14 As shown, the power conversion device 10 may include a housing 100, a fan cover 200, a first fan 500, a heat sink 300, a first air duct plate 420, and a circuit board 120. The housing 100 encloses a receiving cavity, which may be a power cavity 110, and the power cavity 110 is a sealed cavity.

[0071] In one embodiment, the housing 100 encloses a power cavity 110. The plate on the opposite side of the housing 100 in the Y direction is a first back plate 130. The first back plate 130 has an open heat dissipation cavity 210 on the side facing away from the power cavity 110. The heat dissipation cavity 210 can be a completely open structure, or it can be enclosed by providing a fan cover 200 on the outside of the first back plate 130 to form a heat dissipation cavity 210 with a certain amount of accommodation space. In this embodiment, the heat dissipation cavity 210 is enclosed by providing a fan cover 200 on the outside as an example.

[0072] In one embodiment, the air hood 200 can be two parts independent of the housing 100. The housing 100 can be a hollow structure and have two side panels in the X direction and the opposite X direction, and a top plate and a bottom plate in the Z direction and the opposite Z direction respectively. The housing 100 can have an opening on one side of the Y direction. The housing 100 can be mounted on the mounting plate 20. The mounting plate 20 seals the opening on the side of the housing 100 in the Y direction. The side of the housing 100 in the opposite Y direction is the first back plate 130. The two side panels, the top plate, the bottom plate, the mounting plate 20 and the first back plate 130 together enclose a sealed power chamber 110. The first back plate 130 can be a flat plate, or other regular or irregular plate-like structures such as an arc-shaped plate. In one embodiment, the first back plate 130 can also be other non-plate-like structures (for example, a non-plate-like structure formed by the first back plate 130 having a larger thickness along the X direction). In this embodiment, the four edges of the first back plate 130 are sealed to the edges of the two side plates, the top plate and the bottom plate of the shell 100. For example, if it is a metal plate, it can be sealed by welding, and if it is a non-metallic plate such as plastic, it can be sealed by gluing, so as to form a relatively sealed power cavity 110 and heat dissipation cavity 210. The power cavity 110 and the heat dissipation cavity 210 are sealed and isolated, and the air in the heat dissipation cavity 210 will not flow into the power cavity 110.

[0073] In one embodiment, the air hood 200 can be an integral whole with the shell 100, that is, the side panels of the air hood 200 and the side panels of the shell 100 are a plate body, and a partition is set inside to separate the power cavity and the heat dissipation cavity. The first back plate 130 can be the partition.

[0074] The circuit board 120 can be installed in the power cavity 110, wherein the circuit board 120 can be parallel to the first backplane 130, and components can be installed on at least one side of the circuit board 120 in the Y direction and the opposite Y direction. In one embodiment, components can be installed on both sides of the circuit board 120 in the Y direction and the opposite Y direction.

[0075] In one embodiment, see Figure 8 As shown, the circuit board 120 can be placed in the power cavity 110 of the housing 100, and components can be installed on both sides of the circuit board 120. Among them, a power device 121 can be installed on one side of the circuit board 120, and a heat-generating electronic device 122 can be installed on the other side (it should be noted that heat-generating electronic devices refer to some heat-dissipating devices that cannot be directly attached to the radiator substrate and have certain heat dissipation requirements. Compared with some low-protection devices, heat-generating electronic devices have a relatively low working heat resistance and need to be cooled to a relatively low temperature before they can work and maintain a certain working life). The power device 121 and the heat-generating electronic device 122 are respectively installed on opposite sides of the circuit board 120. In one embodiment, the power device 121 may include power devices such as IGBT, power MOSFET, gallium nitride enhanced HEMT, power discrete components, protection switch, silicon driver, gallium nitride driver, IGBT module and intelligent power module (IPM), and the heat-generating electronic device 122 may include thin film capacitors, relays, electrolytic capacitors, optocouplers, resistors, common-mode inductors, L2 inductors, Hall, lightning arresters and PCBs. The heat generated by heat-generating electronic devices is directly discharged inside the high-protection cavity, which will cause the temperature inside the high-protection cavity to be high. The electrolysis in these devices needs to work at a lower temperature (for example, below 75 degrees) to ensure long-term reliability and life.

[0076] In one embodiment, see Figure 7 and Figure 8 As shown, the power conversion device 10 also includes a radiator 300, which is located in the heat dissipation cavity 210. The wind in the heat dissipation cavity 210 can pass through the radiator 300, and can perform contact heat exchange when passing through the radiator 300, thereby cooling the radiator 300. The radiator 300 can be thermally connected to the power device 121. Thermally conductive connection refers to a connection method in which the power device 121 can transfer heat to the radiator 300, which can be a contact connection or an interval connection. Specifically, when the temperatures of the power device 121 and the radiator 300 are both stable, an increase in the temperature of the power device 121 will cause the temperature of the radiator 300 to rise, and the outward heat radiation of the radiator 300 will also increase accordingly.

[0077] Among them, see Figure 9 and Figure 10As shown, the radiator 300 may include a heat exchange plate 310 and fins 320. The heat exchange plate 310 may be made of a metal plate with high thermal conductivity, such as an aluminum plate. The heat exchange plate 310 may be a flat plate, or may be designed to match the shape of the power device to which it is fitted, which is not specifically limited in this application. The fins 320 are erected on one of the side surfaces of the heat exchange plate 310, and the number of the fins 320 may be at least two, for example, 30. The 30 fins 320 are spaced apart along the length direction of the heat exchange plate 310 (the spacing direction may not be limited, and the embodiment of this application only takes the length direction as an example) to form a heat dissipation duct 330 between two adjacent fins 320. The fins 320 are parallel to each other, so that all the heat dissipation ducts 330 in the radiator 300 extend in the same direction. See Figure 9 As shown, the heat dissipation duct 330 can extend along the Z direction, and air in the heat dissipation duct 330 can flow along the Z direction to remove heat from the fins 320, thereby reducing the temperature of the heat sink 300. The fins 320 and the heat exchange plate 310 can be an integral structure. The integral structure can be formed by integral compression molding, or the heat dissipation duct 330 can be formed from a single aluminum block by turning it into a whole aluminum block to form the structure of the heat sink 300.

[0078] In one embodiment, see Figure 8 and Figure 9 As shown, a first through hole 131 can be provided on the first back plate 130, and a portion of the heat sink 300 can pass through the first through hole 131 on the first back plate 130 and be thermally connected to the power device 121 in the power cavity 110, such as a contact connection or a connection with a spacer thermal conductive material. The heat sink 300 and the inner wall of the first through hole 131 on the first back plate 130 are in contact with each other, such as the side wall of the heat exchange plate 310 and the inner wall of the first through hole 131 are sealed to ensure that the power cavity 110 is a sealed cavity. The fins 320 of the heat sink 300 are set in the heat dissipation cavity 210, and the power device 121 on the circuit board 120 in the power cavity 110 can conduct heat to the heat sink 300. The heat sink 300 conducts heat to the heat dissipation cavity 210, and the heat is dissipated by the first fan set in the heat dissipation cavity 210.

[0079] In one embodiment, the heat sink 300 can be entirely located within the heat dissipation cavity 210. The power device 121 mounted on the circuit board 120 within the power cavity 110 can pass through the first through-hole 131 and contact the heat sink 300 within the heat dissipation cavity 210, thereby achieving thermal contact between the heat sink 300 and the power device 121, and the power device can transfer heat to the heat sink 300. In this embodiment, the size of the first through-hole 131 can be the same as that of the power device 121. The inner wall of the first through-hole 131 is sealed to the power device 121, thereby achieving a sealed connection between the power cavity 110 and the heat dissipation cavity 210.

[0080] In one embodiment, the power device 121 can be located between the circuit board 120 and the heat sink 300. The power device 121 is mounted on the side of the circuit board 120 opposite to the Y direction and is in contact with the heat sink 300 that passes through the first backplane 130. The heat generated by the power device 121 can be directly transferred to the heat sink 300, where the heat is conducted away for dissipation. The heat-generating electronic device 122 is mounted on the side of the circuit board 120 in the Y direction. On the one hand, the heat-generating electronic device 122 exchanges heat with the air or other medium within the power cavity 110 and is cooled by the heat exchanger. On the other hand, the heat-generating electronic device 122 can exchange heat with the circuit board 120 and transfer heat to the heat sink 300 through the power device 121 for dissipation.

[0081] In one embodiment, see Figure 7 and Figure 8 As shown, the air hood 200 may include a bottom plate 220a, two first side plates 220b, a top plate 220c and a second back plate 230. The first back plate 130, the second back plate 230, the bottom plate 220a, the two first side plates 220b and the top plate 220c together enclose a heat dissipation cavity 210. The bottom plate 220a, the two first side plates 220b and the top plate 220c are connected between the second back plate 230 and the first back plate 130. The second back plate 230 can be used to dissipate heat on the side away from the first back plate 130. Figure 2 A separation space 101 is formed between the environmental structures shown, and the second back plate 230 is used to isolate the heat dissipation cavity 210 from air discharge toward the separation space 101 .

[0082] In one embodiment, the air cover 200 may be an independent box, with the side of the box facing the first back plate 130 being closely connected to the first back plate 130. Alternatively, in one embodiment, the air cover 200 may be a trough, with the open edge of the trough connected to the first back plate 130 to enclose a heat dissipation cavity 210 on one side of the first back plate 130.

[0083] The first back plate 130 and the second back plate 230 may be parallel to each other. Figure 1 and Figure 2 In the illustrated power conversion device 10 structure, the second back plate 230 of some power conversion devices 10 is used to form a separation space 101 between the second back plate 230 and the surrounding structure on the side facing away from the first back plate 130. It should be noted that the surrounding structure can be the mounting plate 20 of other power conversion devices 10 on the right side, or it can be a wall or other structure that can form a separation space 101 with the power conversion device 10. Figure 11 As shown, the second back plate 230 can be a sealing plate, and no ventilation structure such as through holes is set on the second back plate 230, so that the second back plate 230 is used to isolate the heat dissipation cavity 210 from discharging air into the partition space 101.

[0084] In one embodiment, an air inlet 221 and an air outlet 222 are provided on the air hood 200. The air inlet 221, the heat dissipation cavity 210, and the air outlet 222 are sequentially connected to form a ventilation duct. The air inlet 221 can be provided on the bottom plate 220a, and the air outlet 222 can include a first air outlet 222a. The first air outlet 222a can be provided on the first side plate 220b. Each first side plate 220b is provided with a first air outlet 222a, and the first air outlet 222a can be located on the side of the first side plate 220b close to the Z direction, so that the ventilation duct can take in air from the opposite direction of the Z direction, pass through the radiator 300 in the heat dissipation cavity 210, and discharge air from the Z side of the radiator 300.

[0085] In one embodiment, an air outlet may not be provided on the top plate 220c on the Z-direction side of the air hood 200 to prevent rain or dust from entering the heat dissipation cavity 210 from the air outlet on the Z-direction side of the air hood 200 under the action of gravity and contaminating or damaging the components in the heat dissipation cavity 210.

[0086] In one embodiment, see Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 and Figure 16 As shown, the power conversion device 10 further includes a first air duct plate 420, which is located between the first back plate 130 and the second back plate 230, and the first air duct plate 420 is arranged parallel to the first back plate 130 and the second back plate 230. The first air duct plate 420 can separate the heat dissipation cavity 210 into a first heat dissipation cavity 211 and a second heat dissipation cavity 212.

[0087] The first air duct plate 420 and the first back plate 130 enclose a first heat dissipation cavity 211 , and the first air duct plate 420 , the first side plate 220 b and the second back plate 230 enclose a second heat dissipation cavity 212 . The radiator 300 may be located in the first heat dissipation cavity 211 .

[0088] In one embodiment, a return air channel 213 may be provided between the first air duct plate 420 and the top plate 220c of the air cover. The return air channel 213 may be located on the side of the first heat dissipation cavity 211 and the second heat dissipation cavity 212 away from the air inlet 221 , and the return air channel 213 connects the first heat dissipation cavity 211 and the second heat dissipation cavity 212 .

[0089] The first air duct plate 420 has a gap between the inner wall of the top plate 220c on the Z-direction side of the wind cover 200. The space formed by the gap can be a return air channel 213, and the return air channel 213 is connected to the first heat dissipation cavity 211 and the second heat dissipation cavity 212 on the opposite side of the Z-direction.

[0090] After heat exchange within the first heat dissipation chamber 211, the hot air enters the return air duct 213. A portion of the hot air within the return air duct 213 can be discharged from the first air outlets 222a on both sides, located near the Z-direction side (these air outlets are located on the wall of the return air duct 213). A portion of the hot air flows over the first air duct plate 420 and enters the second heat dissipation chamber 212. It then flows through the second heat dissipation chamber 212 to the first air outlets 222a on both sides, located near the opposite Z-direction side, and is discharged. The return air duct 213 can form a transfer cavity at the connection point between the first heat dissipation chamber 211 and the second heat dissipation chamber 212, and the hot air is distributed in the return air duct 213.

[0091] An air inlet 221 is provided on the wind cover, and the air inlet 221, the first heat dissipation cavity 211, the second heat dissipation cavity 212 and the first air outlet 222a are connected in sequence. The first fan 500 is located in the wind cover. When the first fan 500 is working, the air entering from the air inlet 221 flows through the first heat dissipation cavity 211 and the second heat dissipation cavity 212 in sequence, and is discharged from the first air outlet 222a.

[0092] Among them, a portion of the first heat dissipation cavity 211 can be located on the opposite side of the second heat dissipation cavity 212 along the Y direction, a portion of the first heat dissipation cavity 211 can be located on the side of the second heat dissipation cavity 212 along the X direction, and a portion of the first heat dissipation cavity 211 can be located on the opposite side of the second heat dissipation cavity 212 along the X direction. The second back plate 230 and the first side plate 220b of the air cover 200 can be separated from the first heat dissipation cavity 211 by the second heat dissipation cavity 212, and the direction of the separation between the first heat dissipation cavity 211 and the second heat dissipation cavity 212 is perpendicular to the flow direction of the ventilation duct.

[0093] The radiator 300 is located in the first heat dissipation cavity 211. The first heat dissipation cavity 211 and the second heat dissipation cavity 212 are isolated on the side close to the air inlet 221 (in the opposite direction of the Z direction), and the first heat dissipation cavity 211 and the second heat dissipation cavity 212 are connected on the side away from the air inlet 221.

[0094] See Figure 12 、 Figure 13 and Figure 14 As shown, the first fan 500 can be located in the air cover 200. When the first fan 500 is working, at least part of the air entering from the air inlet 221 can flow in sequence through the space between the first air duct plate 420 and the first back plate 130 (the first heat dissipation cavity 211), the return air channel 213 and the space between the first air duct plate 420 and the second back plate 230 (the second heat dissipation cavity 212), and be discharged from the first air outlet 222a.

[0095] In this embodiment, a first air duct plate is provided to separate the heat dissipation cavity into a first heat dissipation cavity and a second heat dissipation cavity. Heat dissipation air flowing in the first heat dissipation cavity along the Z direction, after undergoing heat exchange through the radiator, enters the second heat dissipation cavity and is ultimately discharged through the first air outlets on both sides. In this embodiment, the projection of the first air outlet along the X direction can partially overlap with the projection of the radiator, thereby increasing the air outlet area of ​​the first air outlet while reducing the need for a large spacing between the radiator and the top plate. After all of the heat dissipation air passes through the radiator, it can partially enter the lower portion of the first air outlet through the second heat dissipation cavity. This ensures efficient heat dissipation of the heat dissipation cavity from the radiator while increasing the area of ​​the first air outlet without increasing the volume of the air hood. Furthermore, this embodiment allows the hot air in the heat dissipation cavity to be discharged through the second heat dissipation cavity to the portion opposite the Z direction of the first air outlet, thereby increasing the effective air outlet area of ​​the first air outlet and thereby improving the heat dissipation efficiency of the power conversion device.

[0096] Furthermore, the air inlet has an air inlet direction of the first direction, and the side edge of the first air outlet on the side opposite to the first direction can be located on the side edge of the radiator on the side opposite to the first direction, close to the air inlet. The area of ​​the first air outlet provided on a single first side panel is greater than half the area of ​​the single first side panel. The second back panel of the present application can isolate the heat dissipation cavity from air outlet in the direction opposite to the Y direction. The area of ​​the second air outlet should not be too large to prevent the air hood from being too large. This embodiment can achieve a first air outlet with a larger air outlet area to match the air inlet with a larger air inlet area, thereby achieving a balanced air inlet and outlet of the heat dissipation cavity.

[0097] Furthermore, the power conversion device described in the embodiment of the present application forms a heat dissipation cavity by providing a hood, and a circuit board installed in the power cavity of the housing has a power device installed on the side facing the hood. The power device can transfer heat to the radiator in the heat dissipation cavity. The radiator is placed in the heat dissipation cavity, and the heat dissipation cavity can take in air from the bottom. The incoming air can pass through the radiator to reduce the temperature of the radiator, thereby cooling the power device. Furthermore, the hot air after heat exchange will not be blown out from the space between the hood and another power conversion device, which can prevent the exhausted hot air from flowing back to the air inlet through the space, thereby preventing the heat dissipation efficiency of the power conversion device from being reduced due to the backflow of hot air.

[0098] The power conversion device described in this embodiment limits the air inlet to be located at the bottom of the heat dissipation cavity, that is, at the opposite end of the Z direction, so that the heat dissipation cavity can be filled with air from the bottom. Figure 1 In the cabinet-connected energy storage device shown, the bottom air outlet prevents the power conversion devices on the adjacent side from affecting each other, preventing the hot air on the adjacent side from flowing into the side air inlet and causing hot air backflow, thereby preventing the heat dissipation efficiency from being reduced.

[0099] In one embodiment, based on the above embodiment, the power conversion device is provided with a first air duct plate in the heat dissipation cavity, see Figure 3-Figure 7 As shown, the first direction may be the air inlet direction of the air inlet 221, such as Figure 7 The Z direction shown in . The side of the first air outlet 222a on the opposite side of the first direction is located on the side of the radiator 300 on the first direction side close to the air inlet 221. Among them, the side of the first air outlet 222a on the opposite side of the first direction (the opposite direction of the Z direction) can be the first side 222a1, and the side of the radiator 300 on the first direction (Z direction) can be the second side 300a, and the first side 222a1 can be located on the side of the second side 300a close to the air inlet 221 (i.e., the opposite direction of the Z direction). The projection of the first air outlet 222a in the X direction can partially overlap with the projection of the radiator 300 in the X direction. Under this solution, the first air outlet 222a is provided on both first side panels 220b, and the area of ​​the first air outlet 222a provided on each first side panel 220b is greater than half the area of ​​the first side panel 220b. The second back plate 230 of the present application can isolate the heat dissipation cavity 210 from exhausting air in the opposite direction of the Y direction. The area of ​​the second air outlet 222b should not be too large to prevent the volume of the air cover 200 from being too large. This embodiment limits the first air outlet 222a to have a larger outlet area to match the larger air inlet area of ​​the air inlet 221, thereby achieving a balanced air inlet and outlet of the heat dissipation cavity 210. In addition, the heat dissipation cavity is designed with a partition to provide an air duct, so that all air flowing through the heat dissipation cavity can pass through the radiator, and the air outlets do not need to be located on the air outlet side of the radiator. The volume of the device will not be increased by increasing the area of ​​the first air outlet 222a.

[0100] In this embodiment, refer to Figure 11 As shown, the air hood 200 is provided with air outlets 222 on one side in the Y direction, one side in the X direction and one side in the opposite direction of the X direction, so that the heat dissipation cavity 210 can discharge air in three directions. Part of the hot air is blown out from the heat dissipation cavity 210 in the Y direction, part of the hot air is blown out from the heat dissipation cavity 210 in the X direction, and part of the hot air is blown out from the heat dissipation cavity 210 in the opposite direction of the X direction. The air outlet from the three sides will not cause the hot air to enter the separation space 101 and cause hot air backflow, thereby ensuring that the heat dissipation efficiency of the heat dissipation cavity 210 to the radiator 300 is not affected by the air outlet.

[0101] In some possible implementations, based on the above embodiment in which a first air duct plate is provided in the power conversion device, refer to Figure 12 、 Figure 13 、 Figure 14 and Figure 15As shown, the first air duct plate 420 also includes an air collecting plate 410, which is connected to the first air duct plate 420, the first side plate 220b and the second back plate 230. When the first fan 500 is working, all the air entering from the air inlet 221 flows directly into the space between the first air duct plate 420 and the first back plate 130 (the first heat dissipation cavity 211).

[0102] The air concentrator plate 410 can separate the heat dissipation chamber 210 into an inlet chamber 210a and a heat exchange chamber 210b. The inlet chamber 210a and the heat exchange chamber 210b are arranged along the flow direction of the ventilation duct. The inlet chamber 210a is located on the opposite side of the heat exchange chamber 210b in the Z direction. The air inlet 221, the inlet chamber 210a, the heat exchange chamber 210b, and the air outlet 222 are sequentially connected. The heat exchange chamber 210b is divided by the first air duct plate 420 into a first heat dissipation chamber 211 and a second heat dissipation chamber 212, which are arranged in the Y direction at intervals.

[0103] The first heat dissipation cavity 211 and the second heat dissipation cavity 212 are both located in the heat exchange cavity 210b. A ventilation hole 411 is provided on the wind collecting plate 410. The ventilation hole 411 can connect the inlet cavity 210a and the first heat dissipation cavity 211. The inlet cavity 210a, the ventilation hole 411 and the first heat dissipation cavity 211 are connected in sequence along the Z direction. The wind collecting plate 410 is separated between the inlet cavity 210a and the second heat dissipation cavity 212. The wind collecting plate 410 seals and isolates the inlet cavity 210a and the second heat dissipation cavity 212.

[0104] In this embodiment, the air concentrator 410 can separate the heat dissipation chamber 210 into an inlet chamber 210a and a heat exchange chamber 210b. The inlet chamber 210a and the first heat dissipation chamber 211 in the heat exchange chamber 210b are connected via ventilation holes 411. The low-temperature gas in the inlet chamber 210a does not directly enter the second heat dissipation chamber 212, but can only pass through the first heat dissipation chamber 211 and exchange heat with the radiator 300 in the first heat dissipation chamber 211 before entering the second heat dissipation chamber 212. In addition, a first fan 500 can be installed in the inlet chamber 210a. Compared to installing a fan in the first heat dissipation chamber 211, this can increase the fan's air outlet area. The fan's air outlet over a larger area can be directed by the air concentrator 410 into the first heat dissipation chamber, thereby improving heat dissipation efficiency.

[0105] In one embodiment, see Figure 12 and Figure 13 As shown, a first fan 500 can be installed in the inlet chamber 210a. A bracket 214 can be installed in the inlet chamber 210a. The bracket 214 can be a mounting plate and is arranged in the inlet chamber 210a along the XY plane. The mounting plate is provided with mounting holes. The first fan 500 can be fixed to the bracket 214 and guide the cold air blown in by the air inlet 221 into the first heat dissipation chamber 211 through the mounting holes.

[0106] In one embodiment, see Figure 12 and Figure 13 As shown, a portion of the wind collecting plate 410 close to the second heat dissipation cavity 212 is a slope, and this portion gradually tilts toward one side of the Z direction along the Y direction. The inclined wind collecting plate 410 can better guide the cold air introduced by the first fan 500 into the first heat dissipation cavity 211.

[0107] In one embodiment, see Figure 15 As shown, the first air duct plate 420 and the air gathering plate 410 can be an integrated structure, and can be integrally injection-molded or formed by bending and stamping an integral plate.

[0108] The first air duct plate 420 may be erected on the air gathering plate 410 , and a side of the first air duct plate 420 in the opposite direction of the Z direction is sealed and connected to the air gathering plate 410 .

[0109] A space is defined between one side of the first air duct plate 420 in the Z direction and the top plate of the air hood 200 in the Z direction. This space can serve as the return air duct 213. The side edge of the first air duct plate 420 in the Y direction is sealedly connected to the first back plate 130, and the side of the first air duct plate 420 in the opposite direction of the Z direction is sealedly connected to the wind collecting plate 410. This ensures that the first heat dissipation cavity 211 is sealed and isolated from the second heat dissipation cavity 212 in three directions: the X direction, the opposite direction of the X direction, and the opposite direction of the Z direction. The hot air in the first heat dissipation cavity 211 can only enter the second heat dissipation cavity 212 through the return air duct 213.

[0110] In one embodiment, see Figure 13 、 Figure 14 and Figure 15 As shown, the power conversion device can also include two second side panels 422, both of which are connected between the first back panel 130 and the first air duct plate 420, and the first air duct plate 420, the two second side panels 422 and the first back panel 130 together enclose a first heat dissipation cavity 211, and the two second side panels 422, the first back panel 130, the first air duct plate 420 and the second back panel 230 together enclose a second heat dissipation cavity 212.

[0111] In this embodiment, the two second side panels 422 can be an integrated structure with the first air duct plate 420, and a folded plate similar to a "C"-shaped structure is formed by bending an integral flat plate twice.

[0112] In one embodiment, based on the above embodiment in which a first air duct plate and an air collecting plate are provided in the power conversion device, Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 and Figure 22As shown, the power conversion device may further include a second air duct plate 430, two second side plates 422, and a sealing plate 440. The second air duct plate 430 may be located between the first air duct plate 420 and the second back plate 230 and arranged parallel to the first air duct plate 420. The two second side plates 422 are arranged opposite each other, and each second side plate 422 is connected between the first back plate 130 and the second air duct plate 430. Each second side plate 422 is connected to a side edge of the first air duct plate 420 and a side edge of the sealing plate 440. The sealing plate 440 may be sealingly connected to the top of the first air duct plate 420 (the top edge close to the Z direction) and the side of the second air duct plate 430 facing the first air duct plate 420 (including the top edge of the second air duct plate 430).

[0113] The first air duct plate 420, the second air duct plate 430, the sealing plate 440 and the two second side plates 422 together enclose a first heat insulation cavity 423. The first heat insulation cavity 423 is located between the first heat dissipation cavity 211 and the second heat dissipation cavity 212. The first heat insulation cavity 423 can prevent the heat of the second heat dissipation cavity 212 from being transferred to the first heat dissipation cavity 211 through the first air duct plate 420, thereby affecting the heat dissipation of the radiator.

[0114] In this embodiment, the two second side panels 422 not only enclose the first air duct plate 420, the second air duct plate 430 and the sealing plate 440 to form the first insulation cavity 423, but a portion of the second side panel 422 is also connected between the first air duct plate 420 and the first back panel 130, so as to be located between the first side panel 220b and the radiator 300, isolating the first air outlet 222a on the first side panel 220b from the radiator 300.

[0115] The first air duct plate 420, the second air duct plate 430 and the two second side plates 422 are all sealed and connected to the wind collecting plate 410 on the opposite side of the Z direction, which can prevent the wind blown in by the first fan from directly entering the second heat dissipation cavity 212. The wind can only enter the second heat dissipation cavity 212 through the first heat dissipation cavity 211 and the return air channel 213.

[0116] It should be noted that a guide member 428 is provided on the back side of the second air duct plate 430. The presence of the guide member 428 allows the width of the portion of the second side panel 422 below the guide member 428 to be smaller than the width of the portion of the second side panel 422 above the guide member 428. A gap is formed between the first air duct plate 420 and the second air duct plate 430 to form an insulating cavity. The second side panels 422 on the upper and lower sides of the guide member 428 are both sealedly connected to the first back panel 130. The portion of the second side panel 422 below the guide member 428 is sealedly connected to the second air duct plate 430, and the portion of the second side panel 422 above the guide member 428 is sealedly connected to the first air duct plate 420. The distance between the first air duct plate 420 and the first back panel 130 is smaller than the distance between the second air duct plate 430 and the first back panel 130. Air above the guide member 428 does not flow below the guide member 428, and the width of the portion of the second side panel 422 below the guide member 428 can be smaller than the width of the portion of the second side panel 422 above the guide member 428. The specific implementation of the guide member 428 can refer to the corresponding description of the embodiments below.

[0117] In one embodiment, see Figure 23 and Figure 24 As shown, the power conversion device may further include a third side plate 425, which is arranged opposite to the second side plate 422, and a second heat-insulating cavity 426 is provided between the second side plate 422 and the third side plate 425. The second heat-insulating cavity 426 is located between the first heat-dissipating cavity 210 and the first side plate 220b to provide heat insulation between the two sides of the first heat-dissipating cavity 211 and the second heat-dissipating cavity 212 to prevent the heat of the second heat-dissipating cavity 212 from being transferred to the first heat-dissipating cavity 211.

[0118] The third side plate 425 is located on the inner side of the second side plate 422 , and the third side plate 425 can be connected to the second air duct plate 430 . The third side plate 425 is connected between the first back plate 130 and the second air duct plate 430 .

[0119] The sealing plate 440 can extend to the side of the third side panel 425 facing the second side panel 422 and be sealed between the second and third side panels 422, 425. The second side panel 422, the third side panel 425, a portion of the sealing plate 440, and the first back panel 130 together enclose a heat-insulating cavity, which is formed by the first heat-insulating cavity 423 and the second heat-insulating cavity 426. The first heat-insulating cavity 423 and the second heat-insulating cavity 426 can be connected or isolated.

[0120] The present application sets up a heat-insulating cavity so that the hot air circulating in the second heat dissipation cavity 212 will not transfer heat to the first heat dissipation cavity 211 , thereby preventing the hot air circulating in the second heat dissipation cavity 212 from reducing the heat dissipation efficiency of the radiator 300 in the first heat dissipation cavity 211 .

[0121] In one embodiment, a heat insulating device, such as heat insulating ceramic or other heat insulating materials, may be provided in the first heat insulating cavity 423 to better separate the heat exchange between the first heat dissipation cavity 211 and the second heat dissipation cavity 212 .

[0122] In one embodiment, based on the above embodiment in which a first air duct plate, an air collecting plate and a second air duct plate are provided in a power conversion device, Figure 13 As shown, a heat exchanger 600 can also be set in the inlet cavity 210a, and a heat exchange channel is provided in the heat exchanger 600. The openings at both ends of the heat exchange channel of the heat exchanger 600 can be connected to the power cavity 110. The heat emitted by the heat-generating electronic components in the power cavity 110 heats the gas in the power cavity 110 through thermal radiation, and the high-temperature gas can enter the heat exchange channel of the heat exchanger 600. The heat exchanger 600 can be located in the heat dissipation cavity 210, and the cold air circulating through the heat dissipation cavity 210 cools the heat exchange channel of the heat exchanger 600, thereby reducing the gas temperature in the power cavity 110.

[0123] In one embodiment, see Figure 13 and Figure 16 As shown, this embodiment provides a specific structure of a heat exchanger 600 , which includes an inlet channel 610 , a heat exchange channel 620 , and an outlet channel 630 . Figure 16 The two side panels of the inlet channel 610 and the outlet channel 630 are exploded to show the internal structures of the inlet channel 610 and the outlet channel 630. The heat exchanger 600 may include an inlet channel 610, a heat exchange channel 620 and an outlet channel 630. The inlet channel 610 and the outlet channel 630 are connected at both ends of the heat exchange channel 620. There may be multiple heat exchange channels 620, for example Figure 16 The six heat exchange channels 620 shown can be six flat heat exchange tubes, spaced apart along the Y direction. The flow direction of the heat exchange channels 620 can be the X direction, and the medium can flow through the heat exchange channels 620 along the X direction. A gap exists between two adjacent heat exchange channels 620, and a fin structure can be provided in the gap to increase the heat exchange efficiency between the outer wall of the heat exchange channel 620 and the air in the heat dissipation cavity. The shell wall of the inlet channel 610 is provided with first flow holes 611. The number of first flow holes 611 is the same as the number of heat exchange channels 620, so that the medium in the inlet channel 610 can enter the multiple heat exchange channels 620 respectively. Correspondingly, the shell wall of the outflow channel 630 can also be provided with multiple second flow holes (not shown in the figure), so that the medium flowing out of the heat exchange channel 620 can enter the outflow channel 630 for discharge.

[0124] An inlet 612 is provided on one side of the inlet channel 610 in the Y direction. The inlet 612 can communicate with the ventilation holes provided on the first back plate 130. Hot air within the power cavity 110 can enter the inlet 612 and then enter the heat exchange channel 620 for heat dissipation. An outlet 631 is provided on one side of the outlet channel 630 in the Y direction. The outlet 631 can communicate with another ventilation hole provided on the first back plate 130. The low-temperature gas within the heat exchange channel 620 can be discharged into the power cavity 110 through the outlet 631, thereby reducing the air temperature within the power cavity 110 and dissipating heat from the heat-generating electronic devices.

[0125] See Figure 17 As shown, Figure 17 According to the direction of the arrow shown, the hot air discharged from the power chamber can enter the heat exchange channel 620 of the heat exchanger 600 through the inlet 612 of the inlet channel 610, and the hot air is subjected to contact heat exchange through the wall tube of the heat exchange channel 620 separated by the medium in the heat dissipation chamber 210 and other heat exchange structures. The low-temperature gas after heat exchange can be discharged through the outlet 631 of the outlet channel 630 and discharged into the power chamber 110.

[0126] In one embodiment, a fan may be built into the heat exchanger 600. The fan may be located within the inlet channel 610, and / or within the outlet channel 630, and / or connected to the outside of the inlet port 612, and / or connected to the outside of the outlet port 631. The fan may increase the flow rate of hot air from the power chamber 110 into the heat exchanger 600, thereby improving the heat exchange efficiency of the heat exchanger 600 with the high-temperature gas in the power chamber 110.

[0127] In one embodiment, see Figure 13 As shown, a second fan 640 may be provided in the power chamber 110 to increase the circulation speed of the gas in the power chamber 110 and the heat exchange efficiency between the high-temperature gas in the power chamber 110 and the heat exchanger 600 .

[0128] In one embodiment, the heat exchanger 600 may also be disposed within the power cavity 110. The inlet 612 and outlet 631 of the heat exchanger 600 may both be connected to the heat dissipation cavity 210, and the internal channels of the heat exchanger 600 may be isolated from the power cavity 110. The low-temperature gas within the heat dissipation cavity 210 may sequentially enter the inlet channel 610, the heat exchange channel 620, and the outlet channel 630, and exchange heat with the gas within the power cavity 110 within the heat exchange channel 620, thereby reducing the temperature of the gas within the power cavity 110 and thereby cooling the heat-generating electronic devices.

[0129] In some possible implementations, based on the above embodiment in which a first air duct plate, an air collecting plate and a second air duct plate are provided in a power conversion device, Figure 22 and Figure 25As shown, the power conversion device also includes a guide member 428, which is located between the second air duct plate 430 and the second back plate 230 and between the second side plate 422 and the first side plate 220b. The guide member 428 has a first guide surface 428a. The air entering the space between the second air duct plate 430 and the second back plate 230 (the second heat dissipation cavity 212) from the return air channel 213 is accelerated after flowing through the first guide surface 428a and flowing toward the first air outlet 222a.

[0130] In one embodiment, the plane where the first guide surface 428a is located is an inclined surface with an acute angle opening facing upward that forms a slope with the first side plate 220b that is closest to it. The first guide surface 428a is inclined along the direction of the heat exchange chamber 210b toward the inlet chamber 210a toward the direction close to the first air outlet 222a, and can guide the hot air entering the second heat dissipation chamber toward the first air outlet on both sides.

[0131] The guide member 428 may include a first guide plate 428b that is arranged at an angle and a second guide plate 428c that is arranged on the opposite side of the second heat dissipation cavity 212 along the Z direction. The opposite side of the first guide plate 428b in the Z direction and the second guide plate 428c are sealedly connected. The first guide plate 428b and the second guide plate 428c are connected to seal and isolate the upper and lower spaces of the guide member 428, and hot air only flows on the Z direction side of the guide member 428.

[0132] In one embodiment, see Figure 29 As shown, the guide member 428 may have a second guide surface 428d, and the second guide surface 428d is flush with the lower edge of the first air outlet 222a. At least a portion of the second guide plate 428c may extend between the second side plate 422 and the first side plate 220b, and separate the upper and lower sides of the second guide plate 428c into two sealed cavities. The upper surface of the second guide plate 428c may be the second guide surface 428d, and the second guide surface 428d may be flush with the lower edge of the first air outlet 222a. The first air outlet 222a is entirely located on the Z-direction side of the second guide plate 428c. The hot air circulating in the second heat dissipation cavity 212 is guided to the Z-direction side of the second guide plate 428c and discharged through the first air outlet 222a.

[0133] In one embodiment, see Figure 26 As shown, the guide member 428 can only be provided with a second guide plate 428c, and the second guide plate 428c can be sealed and connected between the second back plate (not shown in the figure) and the first air duct plate 420 to guide the hot air in the second heat dissipation cavity 212 to the Z-direction side of the second guide plate 428c, thereby preventing the hot air in the second heat dissipation cavity 212 from entering the first heat insulation cavity 423 and the second heat insulation cavity 426 on the opposite side of the Z-direction.

[0134] In one embodiment, see Figure 25 As shown, the number of the first guide plates 428b can be two, the two first guide plates 428b are spaced apart along the X direction, and the two first guide plates 428b can be symmetrically arranged so that the hot air in the second heat dissipation cavity 212 can be diverted into the two first air outlets 222a on both sides.

[0135] In one embodiment, see Figure 27 As shown, the first guide surface 428a can be an arcuate surface including multiple cut surfaces with an upwardly facing acute angle formed with the first side plate 220b closest thereto. The first guide plate 428b can be curved, so that the first guide surface 428a is a curved surface, thereby better guiding the hot air entering the second heat dissipation cavity 212 in the opposite direction of the Z direction toward the X direction and the opposite direction of the X direction. In one embodiment, the connection between the first guide surface 428a and the second guide plate 428c is smoothly transitioned to provide better guidance.

[0136] In one embodiment, see Figure 28 As shown, the number of guide members 428 can be multiple, and the multiple guide members 428 can be arranged at intervals along the Z direction to divide the second heat dissipation cavity 212 into multiple adjacent air outlet channels. The hot air discharged from the first heat dissipation cavity 211 can be diverted by the multiple guide members 428 and enter the multiple air outlet channels respectively. Among them, the first heat dissipation cavity 211 enters the return air channel 213 at a roughly uniform degree in the X direction, and the multiple guide members 428 divide the hot air discharged from the first heat dissipation cavity 211 into multiple groups of nearly equal air volumes, and enter different air outlet channels respectively, so that the first air outlet 222a discharges air uniformly in the Z direction, thereby increasing the effective air outlet area of ​​the first air outlet 222a, and preventing the first air outlet 222a from discharging a large air volume on one side of the Z direction or on the opposite side of the Z direction, while discharging a small air volume on the other side.

[0137] In one embodiment, see Figure 4 and Figure 8 As shown, the top plate of the hood 200 is higher than the top plate of the housing 100, and a second air outlet 222b is provided between the top plate of the hood 200 and the top plate of the housing. Figure 4 The side of the fan cover 200 protrudes from the housing 100 in the Z direction as shown. The fan cover 200 is provided with a panel 240 on the part protruding from the housing 100. The panel 240 is located on the side of the fan cover 200 facing the Y direction, and the panel 240 can be arranged opposite to the mounting plate 20. A space equal to the thickness of the housing 100 in the Y direction can be separated between the panel 240 and the mounting plate 20. The heat dissipation cavity 210 can be separated from the second back plate 230. The second back plate 230 is located between the panel 240 and the mounting plate 20. Figure 4On one side (in the opposite direction of the Y direction shown), a second air outlet 222b is provided on the panel 240.

[0138] In one embodiment, the portion of the air hood 200 protruding from the shell 100 along the third direction may not be provided with a plate body (such as panel 240) on the side facing the Y direction to form a completely open opening, which constitutes the second air outlet 222b. The partial edge of the top plate of the air hood 200 on the Z direction side, the partial edge of the side plates of the air hood 200 on both sides in the X direction and the opposite direction of the X direction, and the side edge of the first back plate 130 on the Z direction side together constitute the edge of the second air outlet 222b.

[0139] The height of the second air outlet 222b along the Z direction is related to the height of the air cover 200 protruding from the housing 100 in the third direction, and the length of the second air outlet 222b along the X direction is related to the length of the air cover 200 in the X direction. In the present application, in order to prevent the size of the air cover 200 from being too large and to better match the size of the housing 100, the height of the air cover 200 protruding from the housing 100 in the third direction should not be too large. The second air outlet 222b can be formed into a slit-like structure so that the hot air after heat exchange in the heat dissipation cavity 210 can be discharged to the Y-direction side of the air cover 200 through the second air outlet 222b, ensuring that the heat dissipation cavity 210 has a certain air outlet area.

[0140] In one embodiment, see Figure 6 and Figure 7 As shown, the enclosure 220 includes a first side panel 220b. The first side panel 220b, the second back panel 230, and the first back panel 130 together constitute the side wall of the ventilation duct. The first side panel 220b is provided with a first air outlet 222a. There can be two first side panels 220b, which are respectively located on one side of the heat dissipation cavity 210 in the X direction and the other side in the opposite direction of the X direction. At least one of the two first side panels 220b can be provided with a first air outlet 222a. In this embodiment, the first air outlet 222a is provided on both first side panels 220b as an example. The first air outlet 222a is connected to the air outlet side of the heat dissipation cavity 210. The cold air entering the heat dissipation cavity 210 from the air inlet 221 first passes through the radiator 300 to cool the radiator 300. The hot air after heat exchange in the radiator 300 can be discharged through the first air outlet 222a.

[0141] The first back plate 130 and the second back plate 230 are arranged opposite to each other, and the first side plate 220b, the second back plate 230 and the first back plate 130 enclose a heat dissipation cavity 210. A first air outlet 222a is provided on the first side plate 220b. A radiator 300 is provided in the heat dissipation cavity 210, and the radiator 300 is thermally connected to the power device.

[0142] In this embodiment, the area of ​​the air inlet 221 can be determined based on the area of ​​the bottom plate 220a. To ensure that the volume of the hood 200 is not too large, the area of ​​the second air outlet 222b is generally smaller than the area of ​​the air inlet 221. A large difference in area can lead to an imbalance in the air inlet and outlet areas within the heat dissipation cavity 210. In this embodiment, by providing the first air outlet 222a, it can be combined with the second air outlet 222b to increase the air outlet area, ensuring a stable air volume for the air inlet and outlet of the heat dissipation cavity 210, increasing the air inlet and outlet areas of the heat dissipation cavity 210, and improving the heat dissipation efficiency of the radiator 300.

[0143] In one embodiment, see Figure 30 As shown, an air guide plate 224 is provided at the air outlet 222. The air guide plate 224 is inclined toward a side away from the air inlet (not shown) along the air outlet direction of the air outlet 222. For example, the air guide plate 224 is provided on the inner side of the first side plate 220b of the air hood 200. The air guide plate 224 can guide the air discharged from the first air outlet 222a to be discharged obliquely upward, further preventing the hot air discharged from the first air outlet 222a from flowing back into the air inlet 221.

[0144] In one embodiment, the number of the air guide plates 224 is at least two, and the at least two air guide plates 224 can be arranged at intervals along the Z direction to form a structure similar to a shutter, so as to better guide the wind discharged from the first air outlet 222a obliquely upward.

[0145] In one embodiment, see Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, a filter 225 is provided at the air outlet 222, and the filter 225 covers at least a portion of the air outlet 222. The filter 225 can prevent some impurities from entering the heat dissipation cavity 210 through the air outlet 222.

[0146] The present application also provides an energy storage device, including the power conversion device 10 provided in any of the above embodiments, see Figure 31 As shown, it can also include photovoltaic panels 21, AC junction boxes 22 and string inverters 25. The string inverter 25 can be the power conversion device 10 described in any of the above embodiments, connected between the photovoltaic panels 21 and the AC junction box 22. The string inverter 25 can convert the variable DC voltage of the photovoltaic panels 21 into AC power at the mains frequency, and transmit it to the AC junction box 22, and then transmit it to the power grid 24 through the box transformer 23, thereby realizing the conversion of light energy into usable electrical energy. In one embodiment, the converted AC power can also be fed back to the commercial power transmission system. The string inverter 25 is one of the important system balances (BOS) in the photovoltaic array system and can be used in conjunction with general AC-powered equipment.

[0147] In one embodiment, the string inverter, the AC combiner box 22, the box transformer 23 and the power grid 24 are connected in series, and the string inverter 25, the AC combiner box 22 and the box transformer 23 can be connected through an AC cable.

[0148] In some possible implementations, see Figure 32 and Figure 33 As shown, the power conversion device 10 can also be used for power conversion of electric energy to charge and discharge a battery device. The battery device is taken as a battery cluster 33 , for example. The battery cluster 33 is connected to the power conversion device 10 .

[0149] Among them, the energy storage device can be an energy storage cabinet, and the energy storage converter (PCS), direct current converter (DC-DC) and charging module can be independent devices or integrated in the energy storage cabinet and charging pile. The energy storage converter (PCS) and direct current converter (DC-DC) can be set in the energy storage cabinet, and the charging module can be set in the charging pile.

[0150] This embodiment takes energy storage cabinets and other energy storage devices as an example. The energy storage device can be a device that integrates batteries and control cabinets. The control cabinet and battery are coupled and connected to manage the battery. The conversion between electrical energy and chemical energy is used to achieve the storage and output of electrical energy. The battery can be used as a backup power source, or to reduce peak power and fill valley power when the power supply of the power system is uneven, or to perform frequency modulation when the load or power generation of the power system is large, or it can be used in a photovoltaic power generation system.

[0151] Currently, energy storage equipment is primarily used in two scenarios: industrial and commercial (I&C) and power plant storage. I&C energy storage typically uses energy storage cabinets, with a granularity of around 200 kWh, and is commonly used in large and small factories, commercial office buildings, and power stations. Power plant storage typically uses energy storage containers, with a granularity of megawatt-hours, and is commonly used for photovoltaic and wind power storage.

[0152] See Figure 32 As shown, the energy storage cabinet 30 includes a cabinet body 31, multiple battery clusters 33, and multiple energy storage converters 32 connected one-to-one with the multiple battery clusters. The energy storage converter can be the power conversion device described in any of the above embodiments. It is a bidirectional current controllable conversion device connecting the energy storage battery and the power grid (or load). It can control the charging and discharging process of the battery, perform AC / DC conversion, and accurately and quickly adjust the voltage, frequency, and power between the power grid and the energy storage system to achieve constant power and constant current charging and discharging as well as smooth fluctuating power output.

[0153] The cabinet 31 has a storage space, and multiple battery clusters 33 and energy storage converters 32 are located within the cabinet 31. The energy storage cabinet may also include a DC converter and a power distribution module, which may constitute the power conversion equipment in the energy storage cabinet.

[0154] In one embodiment, the cabinet 31 can be a container, the energy storage device can be an energy storage container, the battery cluster 33 and the energy storage inverter 32 can both be set in the container, and the transportation of the energy storage device is to transport the energy storage device from the production side (manufacturer) to the user side (consumer). In order to facilitate transportation, the battery is placed in a battery compartment, and the battery compartment and the control cabinet are integrated into one to form a prefabricated compartment and then placed in a standard container.

[0155] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A power conversion device, characterized in that: The device comprises a housing, a first fan, a first air duct plate, a radiator and a wind shield located outside the housing, wherein the housing encloses a power cavity, a circuit board is arranged in the power cavity, and a power device is arranged on the circuit board; The housing includes a first back plate, the fan cover and the housing enclose a heat dissipation cavity, the radiator is located in the heat dissipation cavity and is thermally connected to the power device; The hood includes two first side panels and a second back panel, the first air duct panel is located between the first back panel and the second back panel and is arranged parallel to the first back panel and the second back panel, a return air channel is provided between the first air duct panel and the top panel of the hood, the two first side panels are arranged opposite to each other, each of the first side panels is connected between the first back panel and the second back panel, and each of the first side panels is provided with a first air outlet; An air inlet is provided on the air hood, and the first fan is located inside the air hood. When the first fan is working, at least part of the air entering from the air inlet flows through the space between the first air duct plate and the first back plate, the return air channel and the space between the first air duct plate and the second back plate in sequence, and is discharged from the first air outlet.

2. The power conversion device according to claim 1, characterized in that It includes an air gathering plate, which is connected to the first air duct plate, the first side plate and the second back plate. When the first fan is working, all the air entering from the air inlet flows directly into the space between the first air duct plate and the first back plate.

3. The power conversion device according to claim 2, characterized in that: It includes a second air duct plate, two second side plates and a sealing plate. The second air duct plate is located between the first air duct plate and the second back plate and is arranged parallel to the first air duct plate. The two second side plates are arranged opposite to each other. The sealing plate connects the top of the first air duct plate and the side of the second air duct plate facing the first air duct plate. Each of the second side plates is connected between the first back plate and the second air duct plate and is connected to the side of the first air duct plate and the side of the sealing plate.

4. The power conversion device according to claim 3, characterized in that: It includes a guide member, which is located between the second air duct plate and the second back plate and between the second side plate and the first side plate. The guide member has a first guide surface. The air entering the space between the second air duct plate and the second back plate from the return air channel is accelerated to flow toward the first air outlet after flowing through the first guide surface.

5. The power conversion device according to claim 4, characterized in that: The plane where the first guide surface is located is an inclined surface that forms an acute angle with the first side plate closest to the first side plate and opens upward; or The first guide surface is an arc surface including a plurality of cut surfaces forming an acute angle with the first side plate closest to the first side plate, with the opening facing upward.

6. The power conversion device according to claim 4 or 5, characterized in that: The guide member has a second guide surface, and the second guide surface is flush with the lower edge of the first air outlet.

7. The power conversion device according to any one of claims 1 to 5, characterized in that: The top plate of the air hood is higher than the top plate of the shell, and a second air outlet is provided between the top plate of the air hood and the top plate of the shell.

8. The power conversion device according to claim 7, characterized in that: The housing includes a mounting vertical plate arranged opposite to the first back plate, and along the direction from the mounting vertical plate to the first back plate, the projection of the mounting vertical plate covers the second air outlet.

9. An energy storage device, characterized in that: It comprises an energy storage container, multiple battery clusters and multiple power conversion devices as described in any one of claims 1 to 8, which are connected one-to-one with the multiple battery clusters. The power conversion device is an energy storage inverter. The energy storage inverter and the battery clusters are both arranged in the energy storage container. The energy storage inverter is used for transmitting electric energy between the corresponding battery cluster and the power grid.

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