A power conversion device

Abstract

This application provides a power conversion device. The power conversion device includes a chassis and an explosion venting assembly. The chassis includes a shell and a cover. The outer edge plate of the shell is fixedly connected to the cover. The explosion venting assembly includes a buffer, a fixing member, and a gasket. The buffer is located on the side of the outer edge plate away from the cover. The buffer includes a first end, a buffer portion, and a second end. The first end, the buffer portion, and the second end are connected sequentially, and the first end and the second end respectively contact the outer edge plate. There is a gap between the buffer portion and the outer edge plate. The gasket is at least partially located on the side of the buffer portion away from the outer edge plate, and the fixing member fixes the gasket, the buffer portion, the outer edge plate, and the cover. When the power conversion device vents an explosion, the buffer portion deforms, and the outer edge plate and the cover separate at the location of the explosion venting assembly, so as to achieve explosion venting of the power conversion device without the cover detaching from the shell, thereby improving the phenomenon of the cover flying off the power conversion device.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a power conversion device. Background Technology

[0002] In photovoltaic (PV) systems, inverters convert the direct current (DC) generated by PV modules into alternating current (AC), supplying this AC power to the grid or loads. An inverter consists of a cover and a housing, inside which are power devices such as AC thin-film capacitors and insulated-gate bipolar transistors (IGBTs). When these power devices fail, flammable gases such as hydrogen, methane, propane, or ammonia may be generated inside the inverter, potentially leading to a combustion explosion. The resulting high voltage can cause the inverter cover to detach from the housing, a phenomenon known as "flying cover." Alternatively, if a vent is created between the inverter cover and the housing, and this vent is too large, the inverter components may be ejected under high voltage, posing a safety hazard. Utility Model Content

[0003] This application provides a power conversion device that enables explosion venting of the power conversion device without the cover plate detaching from the housing, thereby improving the problem of the cover plate flying off the power conversion device.

[0004] In a first aspect, this application provides a power conversion device. The power conversion device specifically includes a chassis and a venting assembly. The chassis includes a covered housing and a cover plate. The housing has an opening and an outer edge plate, the outer edge plate being located around the opening. The cover plate closes to the opening and is fixedly connected to the outer edge plate. The venting assembly specifically includes a buffer member, a fixing member, and a gasket. The buffer member is located on the side of the outer edge plate opposite to the cover plate. The buffer member includes a first end, a buffer portion, and a second end. The first end, the buffer portion, and the second end are connected sequentially, and the first end and the second end respectively contact the outer edge plate. There is a gap between the buffer portion and the outer edge plate. The gasket is at least partially located on the side of the buffer portion opposite to the outer edge plate, and the fixing member fixedly connects the gasket, the buffer portion, the outer edge plate, and the cover plate. When the power conversion device vents an explosion, the buffer portion deforms, and the outer edge plate and the cover plate separate at the location of the venting assembly.

[0005] In the power conversion device of this application, the explosion venting assembly can be used both to fix the housing and the cover plate, and also for explosion venting. When the power conversion device is operating normally, the fixing member of the explosion venting assembly securely connects the gasket, buffer section, outer edge plate, and cover plate. The first end, buffer section, and second end of the buffer section are arched. When an internal fault occurs in the power conversion device and explosion venting is required, the internal high pressure causes the fixing member to spring up. Due to the gap between the buffer section and the outer edge plate, under the tension of the fixing member, the gasket pulls the buffer section towards the outer edge plate, reducing the gap between the buffer section and the outer edge plate, thus reducing the arching degree of the buffer section. Therefore, the impact force of the internal high pressure of the power conversion device on the cover plate and fixing member is partially offset by the deformation of the buffer section. Under the action of the remaining impact force, the cover plate separates from the housing at the connection point of the fixing member, forming an explosion vent to reduce the internal pressure of the power conversion device. This allows for explosion venting of the power conversion device without the cover plate detaching from the housing, thereby improving the problem of the cover flying off the power conversion device. The explosion relief assembly can also control the size of the explosion relief port to prevent secondary hazards such as people putting their hands in, greatly improving the safety performance of power conversion equipment.

[0006] In one possible implementation, the gasket is a T-shaped gasket, with one end located on the side of the buffer portion away from the outer edge plate and in contact with the buffer portion. The other end of the gasket passes through the buffer portion and is located between the buffer portion and the outer edge plate, and the fastener is threadedly connected to this other end of the gasket. In this implementation, when the fastener pulls the gasket and the buffer portion under impact force, the portion of the gasket in contact with the buffer portion can increase the effective area of ​​the gasket on the buffer portion, thereby reducing the pressure of the force applied to the buffer portion and thus improving the stiffness of the explosion relief assembly. Furthermore, the portion of the gasket located between the buffer portion and the outer edge plate can be threadedly connected to the fastener, and can also be squeezed and deformed by the buffer portion when the buffer portion deforms, thus offsetting part of the force.

[0007] In one possible implementation, the gasket at one end between the fixing member and the buffer part is a circular piece, which increases the contact area between the gasket and the buffer part while facilitating processing.

[0008] In one possible implementation, the buffer member has a bent structure. The first end, the buffer portion, and the second end are all flat surfaces, and they are all parallel to each other. The buffer portion is connected to the first end via a first connecting portion, and to the second end via a second connecting portion. Both the first and second connecting portions are flat surfaces and perpendicular to the buffer portion. In this implementation, the buffer member is arranged in a Z-shape. Of course, in other implementations, the buffer member can be arched or other shapes.

[0009] In one possible implementation, the outer edge plate includes a first side plate, a second side plate, a third side plate, and a fourth side plate connected sequentially, which surround the outer periphery of the opening. The first and third side plates are arranged opposite each other, and the second and fourth side plates are also arranged opposite each other. Each of the first and third side plates is provided with at least one explosion-venting component. In practical applications, the first and third side plates of the outer edge plate are both arranged along the direction of gravity, i.e., perpendicular to the ground. The second and fourth side plates of the outer edge plate are arranged parallel to the ground. Thus, when the power conversion device experiences an explosion, the explosion is vented through the explosion-venting components on the sides, preventing the formation of an explosion vent at the top that could allow external dust or liquid to enter the interior of the power conversion device.

[0010] In one possible implementation, the first side plate and the third side plate are each provided with a plurality of first fasteners, which fix the cover plate to the outer edge plate. In each of the first and third side plates, the aforementioned explosion-proof component can be staggered with the plurality of first fasteners, thereby ensuring that the first and third side plates will not completely separate from the cover plate during explosion venting.

[0011] In one possible implementation, the second and fourth side plates are each provided with a plurality of second fasteners, each of which includes a cover plate screw and a reinforcing washer. The reinforcing washer is located on the side of the outer edge plate opposite to the cover plate. The cover plate screw passes through the cover plate and the outer edge plate and is fixedly connected to the reinforcing washer. In this implementation, the reinforcing washer is used to reduce the pressure exerted on the reinforcing washer by the explosion venting impact force.

[0012] In one possible implementation, the thickness of the reinforcing gasket is greater than or equal to 3 mm. In this implementation, increasing the thickness of the reinforcing gasket increases the contact area between the reinforcing gasket and the outer edge plate, thereby reducing the pressure exerted on the reinforcing gasket by the explosion venting impact force.

[0013] In one possible implementation, the reinforcing gasket is connected to the outer edge plate at both ends by fixing screws. The reinforcing gasket includes a first region and a second region, with the fixing screws located in the first region and the cover plate screws located in the second region. The thickness of the first region is less than the thickness of the second region. In this implementation, thickening the region of the reinforcing gasket connected to the cover plate screws can reduce the pressure of the explosion venting impact, while thinning the region of the reinforcing gasket connected to the fixing screws can reduce manufacturing costs.

[0014] In one possible implementation, the second region is I-shaped to facilitate processing.

[0015] In one possible implementation, when multiple explosion venting components are respectively provided on the first side plate and the third side plate, a reinforcing gasket can also be provided between the fixing member of at least one of the explosion venting components and the cover plate. Therefore, during explosion venting, while the cover plate and the outer edge plate at the explosion venting component form an explosion vent, the reinforcing gasket, fixing member, and gasket can keep the cover plate and the outer edge plate connected. Attached Figure Description

[0016] Figure 1 A schematic diagram of a photovoltaic power generation system provided in an embodiment of this application;

[0017] Figure 2 A schematic diagram of a power conversion device provided in an embodiment of this application;

[0018] Figure 3 Another schematic diagram of the power conversion device provided in the embodiments of this application;

[0019] Figure 4 A schematic diagram of the explosion venting component provided in an embodiment of this application;

[0020] Figure 5 This is a partial schematic diagram of the explosion venting component provided in an embodiment of this application;

[0021] Figure 6 for Figure 5 This is a schematic diagram of an explosion venting component.

[0022] Figure 7 for Figure 5 Another schematic diagram of the explosion venting component;

[0023] Figure 8 Rear view of a power conversion device provided in an embodiment of this application;

[0024] Figure 9 for Figure 3 A partial schematic diagram of a power conversion device;

[0025] Figure 10 for Figure 9 A schematic diagram of the reinforcing gasket.

[0026] Figure label:

[0027] 10-Photovoltaic Power Generation System

[0028] 11-Photovoltaic Modules

[0029] 12-Power Conversion Equipment

[0030] 13-Power Grid

[0031] 14-Load

[0032] 121-Chassis

[0033] 122-Explosion relief assembly

[0034] 123-Shell

[0035] 124-Cover Plate

[0036] 125-Outer edge plate

[0037] 126-Buffer

[0038] 127-Gasket

[0039] 128-Fasteners

[0040] 129-Fasteners

[0041] 130-Cover plate screws

[0042] 131-Reinforced gasket

[0043] 132-Fixing Screw

[0044] 125a - First Side Plate

[0045] 125b - Second Side Plate

[0046] 125c - Third Side Panel

[0047] 125d - Fourth Side Plate

[0048] 126a-First End

[0049] 126b-Buffer Section

[0050] 126c - Second End

[0051] 127a-One end

[0052] 127b other end

[0053] 127c - Threaded Hole

[0054] 131a - First Region

[0055] 131b - Second Region Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0057] To facilitate understanding of the power conversion device provided in the embodiments of this application, its application scenarios are described below. The power conversion device of this application can be applied to power supply systems and power generation systems. Taking a photovoltaic power generation system as an example, a photovoltaic power generation system can be used in application scenarios such as residential power stations and industrial photovoltaic power stations. A photovoltaic power generation system is used to convert solar energy into electrical energy and supply the electrical energy to the power grid or load. Figure 1 This is a schematic diagram of a photovoltaic power generation system provided in an embodiment of this application. Figure 1 As shown, the photovoltaic power generation system 10 may include a photovoltaic module 11 and a power conversion device 12. The output terminal of the photovoltaic module 11 is connected to the input terminal of the power conversion device 12. The power conversion device 12 is used to convert the DC power output by the photovoltaic module 11 into power and output it to the power grid 13 or the load 14.

[0058] In current power conversion equipment, when power devices fail or malfunction, flammable gases such as hydrogen, methane, propane, or ammonia may be generated inside the inverter, making the internal structure of the power conversion equipment prone to explosion. An explosion could cause components to fly out and injure people if the explosion vent is too large.

[0059] For example, power conversion equipment can address the issue of hydrogen combustion and explosion through both explosion-proof and explosion-venting methods. As the power of power conversion equipment increases, the strength requirements for its chassis also become more stringent. Specifically, the chassis includes a shell and a cover plate, and the primary failure location for power conversion equipment is the connection between the cover plate and the shell.

[0060] In view of this, this application provides a power conversion device to achieve explosion venting of the power conversion device without the cover plate detaching from the housing, thereby improving the phenomenon of the cover flying off the power conversion device.

[0061] It should be noted that the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0062] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0063] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0064] Furthermore, in this article, directional terms such as "top," "bottom," "upper," and "lower" are defined relative to the orientation of the structure as shown in the attached drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the structure.

[0065] Figure 2 This is a schematic diagram of a power conversion device provided in an embodiment of this application. Figure 3 Another schematic diagram of the power conversion device provided in an embodiment of this application. For example... Figure 2 and Figure 3 As shown, the power conversion device 12 includes a chassis 121 and an explosion venting assembly 122. Specifically, the chassis 121 includes a housing 123 and a cover 124, which can be closed to the housing 123. The housing 123 has an opening, and an outer edge plate 125 is provided around the outer periphery of the opening. When the cover 124 is closed at the opening, the cover 124 can be fixedly connected to the outer edge plate 125.

[0066] Figure 4 for Figure 3 A partial schematic diagram of a power conversion device. Figure 5 This is a partial schematic diagram of the explosion venting component provided in an embodiment of this application. Figure 6 for Figure 5 This is a schematic diagram of an explosion venting component. Figure 4 , Figure 5 and Figure 6As shown, the explosion relief assembly 122 includes a buffer 126, a gasket 127, and a fixing member 128. Specifically, the buffer 126 is located on the side of the outer edge plate 125 facing away from the cover plate 124. The buffer 126 includes a first end 126a, a buffer portion 126b, and a second end 126c. The first end 126a and the second end 126c are respectively used to contact the outer edge plate 125. The buffer portion 126b is located between the first end 126a and the second end 126c, and connects the first end 126a and the second end 126c. A gap exists between the buffer portion 126b and the outer edge plate 125. The gasket 127 is at least partially located on the side of the buffer portion 126b facing away from the outer edge plate 125. The fixing member 128 fixes the gasket 127, the buffer portion 126b, the outer edge plate 125, and the cover plate 124. When the power conversion device 12 explodes, the buffer part 126b deforms and the fixing part 128 separates from the cover plate 124.

[0067] In the power conversion device 12 of this application, the explosion venting assembly 122 can be used both to fix the housing 123 and the cover plate 124, and to vent explosions. When the power conversion device 12 is working normally, the fixing member 128 of the explosion venting assembly 122 connects the gasket 127, the buffer part 126b, the outer edge plate 125, and the cover plate 124 in sequence. The first end 126a, the buffer part 126b, and the second end 126c of the buffer member 126 are arched. When a fault occurs inside the power conversion device 12 and explosion venting is required, the high pressure inside the power conversion device 12 causes the cover plate 124 and the fixing member 128 to spring up. Because there is a gap between the buffer part 126b and the outer edge plate 125, under the pulling force of the fixing member 128, the buffer part 126b is pulled towards the outer edge plate 125, reducing the gap between the buffer part 126b and the outer edge plate 125, thereby reducing the arching degree of the buffer member 126. Therefore, the impact force of the high internal pressure of the power conversion device 12 on the cover plate 124 and the fixing member 128 is partially offset by the deformation of the buffer member 126. Under the action of the remaining part of the impact force, the cover plate 124 separates from the housing 123 at the connection position of the fixing member 128 and forms a vent to reduce the internal pressure of the power conversion device 12. In this way, the power conversion device 12 can be vented without the cover plate 124 detaching from the housing 123, thereby improving the phenomenon of the cover flying off the power conversion device 12.

[0068] The fastener 128 can be a bolt or a screw. When installing the explosion relief assembly 122, the buffer 126 and the gasket 127 are placed on the side of the outer edge plate 125 away from the cover plate 124, and the fastener 128 passes through the cover plate 124 and the outer edge plate 125 from the side of the cover plate 124 away from the outer edge plate 125 and is fixedly connected to the gasket 127.

[0069] Figure 7 for Figure 5 Another schematic diagram of the explosion venting component. (See diagram below.) Figure 5 and Figure 7 As shown, the aforementioned gasket 127 can be a T-shaped gasket 127. One end 127a of the gasket 127 is located on the side of the buffer portion 126b away from the outer edge plate 125 and contacts the buffer portion 126b. The other end 127b of the gasket 127 passes through the buffer portion 126b and is located between the buffer portion 126b and the outer edge plate 125. The other end 127b of the gasket 127 is provided with a threaded hole 127c, and the fixing member 128 is threadedly connected to the threaded hole 127c. In this embodiment, when the fixing member 128 applies a force to the buffer member 126 under the action of impact force, the portion of the gasket 127 located between the fixing member 128 and the buffer portion 126b can increase the contact area between the fixing member 128 and the buffer portion 126b, thereby reducing the pressure of the force applied by the fixing member 128 to the buffer portion 126b, thereby improving the rigidity of the explosion relief assembly 122. The portion of the gasket 127 located between the buffer portion 126b and the outer edge plate 125 can reduce the deformation of the buffer 126 when it deforms, and can also offset part of the force.

[0070] like Figure 5 and Figure 6 As shown, the gasket 127 is a circular piece at one end between the fixing member 128 and the buffer part 126b, which increases the contact area between the gasket 127 and the buffer part 126b while facilitating processing.

[0071] In one specific embodiment, the buffer 126 is configured with a bent structure. The first end 126a, the buffer portion 126b, and the second end 126c are all flat surfaces, and they are all arranged parallel to each other. The buffer portion 126b is connected to the first end 126a via a first connecting portion, and the buffer portion 126b is connected to the second end 126c via a second connecting portion. Both the first and second connecting portions can be flat surfaces, and they are perpendicular to the buffer portion 126b. In this embodiment, the buffer 126 is arranged in a U-shape. Of course, in other embodiments, the buffer 126 can be arched or other shapes.

[0072] Figure 8 This is a rear view of a power conversion device provided in an embodiment of this application. Figure 8As shown, the outer edge plate 125 includes a first side plate 125a, a second side plate 125b, a third side plate 125c, and a fourth side plate 125d connected in sequence. The first side plate 125a and the third side plate 125c are arranged opposite each other, and the second side plate 125b and the fourth side plate 125d are arranged opposite each other. The first side plate 125a and the third side plate 125c are each provided with at least one explosion venting component 122. In practical applications, the first side plate 125a and the third side plate 125c of the outer edge plate 125 are both arranged along the direction of gravity, that is, the first side plate 125a and the third side plate 125c are perpendicular to the ground. The second side plate 125b and the fourth side plate 125d of the outer edge plate 125 are arranged parallel to the ground. Thus, when the power conversion device 12 experiences an explosion, the explosion is vented by the explosion venting components 122 provided on the sides, preventing the formation of an explosion vent at the top that would allow external dust or liquid to enter the interior of the power conversion device 12.

[0073] In one embodiment, the first side plate 125a and the third side plate 125c may each be provided with a plurality of explosion venting components 122. Additionally, the first side plate 125a and the third side plate 125c may each be provided with a plurality of fasteners 129. The plurality of explosion venting components 122 may be located between two adjacent fasteners 129, or the plurality of explosion venting components 122 may be alternately arranged with the plurality of fasteners 129. In this embodiment, the plurality of explosion venting components can form a plurality of explosion venting ports when the power conversion device 12 vents an explosion. Simultaneously, the fasteners 129 secure the housing 123 and the cover plate 124, maintaining the connection between the cover plate 124 and the housing 123 even after the explosion is vented.

[0074] In one embodiment, the second side plate 125b and the fourth side plate 125d may each be provided with a plurality of fasteners 129. Figure 9 for Figure 3 A partial schematic diagram of a power conversion device. Figure 10 for Figure 9 A schematic diagram of the reinforcing gasket. (See diagram below.) Figure 9 and Figure 10 As shown, fastener 129 may include cover plate screws 130 and reinforcing washer 131. Reinforcing washer 131 is located on the side of outer edge plate 125 opposite to cover plate 124. Cover plate screws 130 pass through cover plate 124 and outer edge plate 125 and are fixedly connected to reinforcing washer 131. Reinforcing washer 131 can increase the contact area between reinforcing washer 131 and outer edge plate 125, thereby reducing the pressure of the explosion venting impact force on reinforcing washer 131.

[0075] The thickness of the reinforcing gasket 131 can be greater than or equal to 3 mm, which can reduce the pressure of the explosion venting impact on the reinforcing gasket 131.

[0076] like Figure 9 and Figure 10As shown, in one embodiment, the two ends of the reinforcing gasket 131 are respectively connected to the outer edge plate 125 by fixing screws 132. The reinforcing gasket 131 includes a first region 131a and a second region 131b. The fixing screws 132 are located in the first region 131a, and the cover plate screws 130 are located in the second region 131b. The thickness of the first region 131a is less than the thickness of the second region 131b. In this embodiment, thickening the region of the reinforcing gasket 131 connected to the cover plate screws 130 can reduce the pressure of the explosion venting impact force, while thinning the region of the reinforcing gasket 131 connected to the fixing screws 132 can reduce manufacturing costs. Specifically, the second region 131b can be I-shaped, thereby facilitating the processing of the first region 131a and the second region 131b of the reinforcing gasket 131. Of course, the outer edge plate 125 and the cover plate 124 are also fixedly connected by a number of other fasteners, including threaded bolts and nuts, which will not be described in detail here.

[0077] In practice, under a hydrogen concentration of 17%, the maximum size of the explosion vent needs to be less than 50mm. Existing power conversion equipment has equally spaced fastening screws on both sides, resulting in three explosion vents on each side of the chassis. When the hydrogen concentration increases, the current design cannot meet the explosion venting requirements. Therefore, it is necessary to use three screws on the left and right sides, and four smaller screws on the top and bottom sides, so that after a hydrogen explosion, the explosion can be vented from two lateral directions on each side.

[0078] In one embodiment, the chassis 121 of the power conversion device 12 has dimensions of 1060*800*400mm. The first side plate 125a and the third side plate 125c are each provided with a venting component 122 and two fasteners 129, with the venting component 122 located between the two fasteners 129. In actual testing, the power conversion device passed the explosion-proof test in a 20% hydrogen concentration scenario, meeting the explosion-proof 3.0 requirement, significantly improving the explosion-proof performance of the power conversion device 12. Furthermore, by changing the spacing of the fasteners 129, the number of vents in the chassis 121 was increased from two to six, evenly distributing the energy of the hydrogen explosion and ensuring that the vent size is less than 50mm.

[0079] When conducting enhanced hydrogen concentration tests, it is advisable to change the number of screws to ensure the location of the explosion vent, with the explosion vent point located where the screw spacing is larger.

[0080] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power conversion device, characterized in that, The power conversion device includes a chassis and an explosion venting component, where: The chassis includes a housing and a cover plate; the housing has an opening and an outer edge plate, and the outer edge plate is located on the outer periphery of the opening; the cover plate covers the opening and is fixedly connected to the outer edge plate; The explosion venting component includes a buffer member, a fixing member, and a gasket; the buffer member is located on the side of the outer edge plate away from the cover plate, and the buffer member includes a first end, a buffer portion, and a second end connected in sequence. The first end and the second end are respectively in contact with the outer edge plate, and there is a spacing between the buffer portion and the outer edge plate; at least part of the gasket is located on the side of the buffer portion away from the outer edge plate, and the fixing member fixedly connects the gasket, the buffer portion, the outer edge plate, and the cover plate; When the power conversion device vents an explosion, the buffer portion is deformed, and the outer edge plate and the cover plate are separated at the position of the explosion venting component.

2. The power conversion device as described in claim 1, characterized in that, The gasket is a T-shaped gasket. One end of the gasket is located on the side of the buffer portion away from the outer edge plate and is in contact with the buffer portion. The other end of the gasket penetrates through the buffer portion and is located between the buffer portion and the outer edge plate, and the fixing member is threadedly coupled to the other end of the gasket.

3. The power conversion device as described in claim 2, characterized in that, The one end of the gasket is a circular sheet.

4. The power conversion device as described in any one of claims 1 to 3, characterized in that, The buffer member is arranged in a bent structure. The first end, the buffer portion, and the second end are respectively flat surfaces and are parallel to each other. The buffer portion is connected to the first end through a first connecting portion, and the buffer portion is connected to the second end through a second connecting portion. The first connecting portion and the second connecting portion are respectively flat surfaces and are both perpendicular to the buffer portion.

5. The power conversion device as described in any one of claims 1 to 4, characterized in that, The outer edge plate includes a first side plate, a second side plate, a third side plate, and a fourth side plate. The first side plate, the second side plate, the third side plate, and the fourth side plate are connected in sequence and enclose the outer periphery of the opening; the first side plate is opposite to the third side plate, and the second side plate is opposite to the fourth side plate; at least one explosion venting component is provided on each of the first side plate and the third side plate.

6. The power conversion device as described in claim 5, characterized in that, The first side plate and the third side plate are also respectively provided with a plurality of first fasteners, and the plurality of first fasteners fixedly connect the cover plate and the outer edge plate; at least one explosion venting component is arranged in an alternating manner with the plurality of first fasteners.

7. The power conversion device as described in claim 6, characterized in that, The second side plate and the fourth side plate are respectively provided with a plurality of second fasteners. Each of the plurality of second fasteners includes a cover plate screw and a reinforcing gasket; the reinforcing gasket is located on the side of the outer edge plate away from the cover plate, and the cover plate screw penetrates through the cover plate and the outer edge plate and is fixedly connected to the reinforcing gasket.

8. The power conversion device as described in claim 7, characterized in that, The thickness of the reinforcing gasket is greater than or equal to 3 millimeters.

9. The power conversion device as described in claim 8, characterized in that, Both ends of the reinforcing gasket are respectively connected to the outer edge plate through fixing screws. The reinforcing gasket includes a first region and a second region. The fixing screws are located in the first region, the cover plate screws are located in the second region, and the thickness of the first region is less than the thickness of the second region.

10. The power conversion device as described in claim 9, characterized in that, The second region is in an I-shaped.

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