Power converter

Abstract

The utility model provides a power converter. In the power converter of the utility model, the first locking sheet is in the long strip structure, so that at least two first fasteners can be arranged at intervals on the first locking sheet, and the contact area of the first locking sheet with the box or the contact area of the first locking sheet with the cover plate can be increased. When the at least two first fasteners are arranged through the box and the cover plate and connected and fixed with the first locking sheet, the connection of the box and the cover plate can be strengthened, and the possibility of the cover plate flying out can be reduced. The number of the first fasteners on the first locking sheet and the interval between the adjacent two first fasteners can be flexibly adjusted. When the power converter fails and the pressure in the space surrounded by the box and the cover plate increases, a pressure relief point can be formed at the position between the adjacent two first fasteners with a larger interval, and the deformed box or cover plate is blocked by the first locking sheet between the adjacent two first fasteners, so that the deformation amount of the cover plate or the box can be limited, and the use safety of the power converter can be improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more particularly to a power converter. Background Technology

[0002] During operation, the failure of AC thin-film capacitors and insulated-gate bipolar transistors (IGBTs) in power converters (such as photovoltaic inverters and energy storage converters) can lead to explosions. The resulting flammable gases, such as hydrogen, methane, propane, and ammonia, generate high pressure after combustion, which exerts a significant impact force on the power converter's cover plate. This causes the cover plate to detach from the power converter's enclosure and fly out, resulting in an excessively large pressure relief opening that is difficult to control, thus reducing the safety of the power converter in use. Utility Model Content

[0003] This application provides a power converter.

[0004] This application provides a power converter for converting direct current (DC) from photovoltaic modules or energy storage batteries into alternating current (AC), and then transmitting the AC power to the power grid or a load. The power converter includes a housing, a cover plate, and a first locking structure, with the cover plate closing onto the opening of the housing. The first locking structure includes a first locking plate and at least two first fasteners. The first locking plate is disposed along at least one edge of the housing away from the cover plate or the cover plate away from the housing. The at least two first fasteners pass through the cover plate and the housing and are connected and fixed to the first locking plate. Along the length direction of the first locking plate, the at least two first fasteners are spaced apart from the first locking plate.

[0005] In the power converter of this application, the first locking plate has an elongated strip structure, allowing at least two first fasteners to be spaced apart on it. This increases the contact area between the first locking plate and the housing or the cover plate. When at least two first fasteners pass through the housing and cover plate and are fixed to the first locking plate, the connection between the housing and cover plate is strengthened, reducing the possibility of the cover plate flying off. The number of first fasteners on the first locking plate and the spacing between adjacent first fasteners can also be flexibly adjusted. When the power converter malfunctions and the pressure in the space enclosed by the housing and cover plate increases, a pressure relief point can be formed between two adjacent first fasteners with a larger spacing. Furthermore, the deformed housing or cover plate is blocked by the first locking plate between adjacent first fasteners, limiting the deformation of the cover plate or housing and improving the safety of the power converter.

[0006] In one possible implementation, the housing and cover plate between at least one pair of adjacent first fasteners are configured to deform under impact forces inside the housing, thereby forming a first pressure relief port between the deformed cover plate and the housing.

[0007] After a power converter malfunctions, an internal combustion explosion occurs, increasing the internal pressure within the space enclosed by the enclosure and cover. The enclosure and cover deform under the impact of the explosion, causing deformation between at least one pair of adjacent first fasteners (e.g., between two adjacent first fasteners with a larger gap) to form a first pressure relief port, releasing the internal pressure. Furthermore, the first locking piece between the two adjacent first fasteners with a larger gap can constrain the size of the first pressure relief port, preventing operators from inserting their hands into the enclosure and causing secondary harm. Simultaneously, it reduces or eliminates the risk of components flying out of the enclosure, significantly improving the safety of the power converter.

[0008] In one possible implementation, the first locking piece includes a first flat plate portion and a first bent portion. The first bent portion is disposed at opposite ends of the first flat plate portion along the length direction of the first locking piece. The first bent portion is bent relative to the first flat plate portion. The housing or cover plate is fitted with the first flat plate portion, and the first flat plate portion is connected to the first fastener.

[0009] When the power converter experiences combustion and explosion, causing deformation of the housing and cover, the deformation exerts a force on the first flat plate. This stress is effectively transferred to the first bending portions at both ends, significantly reducing the risk of breakage. This allows the first flat plate to effectively limit the deformation of the housing or cover, controlling the size of the first pressure relief port along the arrangement direction of the housing and cover. The first bending portions located at opposite ends of the first flat plate greatly improve the overall bending resistance of the first locking plate, increasing its structural strength and ensuring its service life.

[0010] In one possible implementation, the first locking piece has a first through hole and a first protruding ring corresponding to the first through hole, the first through hole corresponding to a first fastener. The first protruding ring protrudes relative to the first locking piece. The first fastener passes through the corresponding first through hole and is connected and fixed to the first protruding ring.

[0011] After the first fastener passes through the cover plate and the housing, it can be connected and fixed to the side wall of the first through hole and the side wall of the first convex ring, thereby strengthening the connection strength between the first fastener and the first locking piece, and thus strengthening the connection strength between the housing and the cover plate.

[0012] In one possible implementation, the ratio of the length of the first locking piece to the length of the edge where the first locking piece is located is greater than or equal to 0.5 and less than 1.

[0013] The first locking plate can be centrally positioned at its edge. At this edge, the corresponding first locking plate provides a larger pressure-bearing surface, distributing the concentrated force of at least two first fasteners onto the elongated first locking plate, preventing excessive local pressure. Furthermore, the elongated first locking plate can be quickly installed onto the enclosure or cover, simplifying operation and preventing misalignment. Additionally, by controlling the spacing between at least two first fasteners on the first locking plate, controllable pressure relief can be achieved, effectively improving the explosion-proof performance of the power converter.

[0014] In one possible implementation, the first locking piece has a notch located between two adjacent first fasteners.

[0015] When the first locking plate is exposed outside the housing, the notch on the first locking plate provides a drainage channel, allowing water accumulated on the first locking plate to drain smoothly from the notch. In this way, the first fastener on the first locking plate is not easily damaged by water accumulation, ensuring the reliability of the connection between the housing and the cover.

[0016] In one possible implementation, the power converter further includes a second locking structure, which includes a second locking plate and a plurality of second fasteners. The second locking plate is disposed in one of the housing and the cover plate. The second locking plate and the first locking plate are arranged around the opening of the housing. Among the at least two first fasteners, the spacing between at least one pair of adjacent first fasteners is greater than the spacing between any pair of adjacent second fasteners among the plurality of second fasteners. The plurality of second fasteners pass through the cover plate and the housing and are connected and fixed to the second locking plate. The plurality of second fasteners are disposed on the second locking plate.

[0017] Multiple second fasteners can be spaced apart or placed adjacent to the second locking plates. These second fasteners connect the housing and the cover. When the second fasteners are spaced apart on the second locking plates, at least one pair of adjacent first fasteners has a spacing greater than the spacing between any pair of adjacent second fasteners. This ensures that the connection strength between the housing and the cover at the second locking structure is greater than the connection strength at the first locking structure, further enhancing the reliability of the housing and cover connection. In the event of a power converter explosion, this reduces the risk of the cover flying off. The second locking structure primarily serves to fix the housing and cover, while the first locking structure reinforces the connection strength. Simultaneously, the larger spacing between adjacent first fasteners allows the housing and cover corresponding to that first locking plate to deform, creating a pressure relief point. The combination of the first and second locking structures achieves the explosion-proof and explosion-relief functions of the power converter, improving its operational safety and effectively enhancing its explosion-proof performance.

[0018] In one possible implementation, the housing and cover plate between the second locking plate and the first locking plate are configured to deform under impact force from inside the housing along the periphery of the opening of the housing, so as to form a second pressure relief port between the deformed cover plate and the housing, and the second pressure relief port and the first pressure relief port are arranged along the periphery of the opening of the housing.

[0019] When an explosion occurs inside the power converter, increasing the internal pressure of the enclosure, the connection strength between the cover plate at the first and second locking structures and the enclosure is relatively high, making it difficult for the enclosure and cover plate to deform. Along the perimeter of the enclosure opening, there are no other components connecting the cover plate and enclosure between the second and first locking plates. The enclosure and cover plate between adjacent first and second locking plates will deform first, forming a second pressure relief port to release the internal pressure. The second and first pressure relief ports are arranged along the perimeter of the enclosure opening, achieving controllable pressure relief of the power converter.

[0020] In one possible implementation, the second locking piece includes a second flat plate portion and a second bent portion. The second bent portion is disposed at opposite ends of the second flat plate portion along the length direction of the second locking piece. The second bent portion is bent relative to the second flat plate portion. The housing or cover plate is fitted with the second flat plate portion. The second flat plate portion is connected to the second fastener.

[0021] When the power converter experiences a combustion explosion, causing deformation of the housing and cover, the deformation exerts a force on the second flat plate. This stress is effectively transferred to the second bending sections at both ends, significantly reducing the risk of breakage. This allows the second flat plate to be tightened around the cover and housing under the action of multiple second fasteners, reducing the risk of the cover flying off and thus improving the safety of the power converter. The second bending sections located at opposite ends of the second flat plate greatly enhance the overall bending resistance of the second locking plate, increasing its structural strength and ensuring its service life.

[0022] In one possible implementation, the second locking piece is provided with a second through hole and a second protruding ring corresponding to the second through hole. The second through hole corresponds to the second fastener, and the second fastener passes through the corresponding second through hole and is connected and fixed to the second protruding ring.

[0023] After the second fastener passes through the cover plate and the housing, it can be connected and fixed to the side wall of the second through hole and the side wall of the second convex ring, thereby strengthening the connection strength between the second fastener and the second locking piece, and thus strengthening the connection strength between the cover plate and the housing.

[0024] In one possible implementation, the second locking piece has a notch located between two adjacent second fasteners.

[0025] When the second locking plate is exposed outside the housing, the notch on the second locking plate provides a drainage channel, allowing water accumulated on the second locking plate to drain smoothly from the notch. In this way, the second fastener on the second locking plate is not easily damaged by water accumulation, thus ensuring the reliability of the connection between the housing and the cover.

[0026] In one possible implementation, the housing includes a first edge and a second edge disposed opposite to each other, and a third edge and a fourth edge disposed opposite to each other. The first edge and the second edge are both connected to the cover plate by a first locking structure, and the third edge and the fourth edge are both connected to the cover plate by a second locking structure.

[0027] This configuration provides better connection strength at the relatively positioned third and fourth edges. In the event of a combustion or explosion of the power converter, the second locking structure at the third and fourth edges can better tighten the cover plate and housing. Controllable pressure relief points can be formed at the relatively positioned first and second edges.

[0028] In one possible implementation, the ratio of the length of the second locking piece to the length of the edge where the second locking piece is located is greater than or equal to 0.5 and less than 1.

[0029] The second locking plate provides a larger bearing surface, distributing the concentrated force of multiple second fasteners onto the elongated second locking plate, preventing excessive local pressure. Furthermore, the elongated second locking plate can be quickly installed onto the enclosure or cover, simplifying operation and reducing the risk of misalignment. Additionally, by controlling the spacing and number of the multiple second fasteners on the second locking plate, the connection strength between the enclosure and the cover at the second locking structure is enhanced. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0031] Figure 1 This is a schematic diagram of the architecture of an optical energy storage system provided in one embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of a power converter provided in one embodiment of this application;

[0033] Figure 3 for Figure 2 The diagram shown is an exploded view of the power converter.

[0034] Figure 4 for Figure 2 The diagram shows an enlarged view of point IV in the power converter shown.

[0035] Figure 5This is a schematic diagram of the structure of a first locking piece provided in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the structure of a power converter provided in one embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the structure of the housing and cover plate deformed to form a first pressure relief port according to an embodiment of this application;

[0038] Figure 8 A top view of a power converter provided in an embodiment of this application;

[0039] Figure 9 for Figure 8 The power converter shown is a cross-sectional view along line AA;

[0040] Figure 10 This is a schematic diagram of the structure of a power converter provided in one embodiment of this application;

[0041] Figure 11 This is a schematic diagram of the structure of another first locking piece provided in an embodiment of this application;

[0042] Figure 12 for Figure 2 An enlarged view of point XII in the power converter shown;

[0043] Figure 13 for Figure 8 The power converter shown is a cross-sectional view along line BB;

[0044] Figure 14 This is a schematic diagram of the structure of a second locking piece provided in an embodiment of this application;

[0045] Figure 15 This is a schematic diagram of the structure of another second locking piece provided in an embodiment of this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] X - First direction; Y - Second direction; Z - Third direction;

[0048] 10-Box body; 11-Opening; 12-Bottom plate; 13-First side plate; 131-First edge; 14-Second side plate; 141-Second edge; 15-Third side plate; 151-Third edge; 16-Fourth side plate; 161-Fourth edge; 17-First pressure relief port; 18-Second pressure relief port;

[0049] 20-Cover plate;

[0050] 30 - First locking structure; 31 - First locking piece; 311 - First flat plate; 312 - First bent portion; 313 - First through hole; 314 - First protruding ring; 32 - First fastener;

[0051] 40 - Second locking structure; 41 - Second locking piece; 411 - Second flat plate; 412 - Second bent portion; 413 - Second through hole; 414 - Second convex ring; 415 - Notch; 42 - Second fastener;

[0052] 100 - Power converter; 101 - Photovoltaic inverter; 102 - Energy storage converter;

[0053] 200 - Photovoltaic modules;

[0054] 300-Prefabricated Substation;

[0055] 400-Boosting Station;

[0056] 500-Power Grid;

[0057] 600-energy storage battery. Detailed Implementation

[0058] 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.

[0059] Please see Figure 1 , Figure 1 This is a schematic diagram of the architecture of a photovoltaic energy storage system provided in one embodiment of this application. Figure 1 As shown, the photovoltaic-storage system includes a photovoltaic system and an energy storage system. In the photovoltaic system, photovoltaic modules 200 convert solar energy into direct current (DC) through the photovoltaic effect. Each photovoltaic module 200 includes multiple cells connected in series or parallel to achieve a certain output power. A photovoltaic inverter 101 converts the DC power from the photovoltaic modules 200 into alternating current (AC), and then transmits the AC power to a corresponding prefabricated substation 300 for voltage transformation. The prefabricated substation 300 can convert the low-voltage AC power output from the photovoltaic inverter 101 into medium-voltage AC power, and then further transmit the AC power to a step-up substation 400 and then to the power grid 500 or other loads. Alternatively, it can further transmit the AC power to a prefabricated substation 300 corresponding to the energy storage converter 102.

[0060] In the energy storage system, the energy storage battery 600 is used to store the unstable electrical energy from the photovoltaic module 200, and provides stable electrical energy to the grid 500 or other loads through the energy storage converter 102 and the corresponding box-type substation 300. In addition, the energy storage converter 102 can also convert the AC power from the grid 500 into DC power to charge the energy storage battery 600 and store the electrical energy in the energy storage battery 600.

[0061] Figure 1 In the photovoltaic-storage system shown, the photovoltaic inverter 101 and the energy storage converter 102 are the core devices for power conversion, and they are collectively referred to as the power converter 100. The structure of the power converter 100 provided in this application will be described in detail below with reference to the accompanying drawings. It is worth mentioning that the power converter 100 provided in this application can be applied to residential photovoltaic systems, as well as to photovoltaic-storage systems in large-scale ground-mounted power plants or industrial and commercial applications.

[0062] This application provides a power converter 100 for converting alternating current (AC) and direct current (DC) to the other. In one embodiment, the power converter 100 may be a photovoltaic inverter 101. In this embodiment, the power converter 100 is applied in a photovoltaic system and is used to convert DC power from a photovoltaic module 200 into AC power and transmit the AC power to the power grid 500 or other loads.

[0063] In another embodiment, the power converter 100 may be an energy storage converter 102. In this embodiment, the power converter 100 is applied to an energy storage system. The power converter 100 is used to convert DC power from the energy storage battery 600 into AC power and deliver the AC power to the power grid 500 or other loads. In addition, the power converter 100 can also convert AC power from the power grid 500 into DC power to charge the energy storage battery 600.

[0064] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of a power converter 100 provided in an embodiment of this application. Figure 3 for Figure 2The diagram shows an exploded view of the power converter 100. The power converter 100 includes a housing 10, a cover plate 20, a circuit board, and power devices. The housing 10 forms a receiving space with an opening 11. The cover plate 20 closes onto the opening 11 of the housing 10, and the housing 10 and cover plate 20 are connected and fixed to seal and shield the receiving space of the housing 10. The receiving space accommodates the circuit board and power devices. The circuit board can be a printed circuit board (PCB). The power devices are mounted on the circuit board and electrically connected to it. The power devices include power modules, inductors, capacitors, etc. The power module is used to convert DC power from photovoltaic modules or energy storage batteries into AC power. The power module is the execution unit for energy conversion and includes power semiconductor chips, drive circuits, and heat dissipation structures. The power semiconductor chip can be an IGBT, a metal-oxide-semiconductor field-effect transistor (MOSFET), a diode, etc.

[0065] In one embodiment, the power module, inductor, and capacitor may be disposed on the same surface of the circuit board. In another embodiment, at least one of the inductor and capacitor may be disposed on opposite sides of the circuit board from the power module, without limitation.

[0066] The power converter 100 can be installed in a designated location, such as a wall or support rod. In one embodiment, the power converter 100 is mounted in a designated location, with the side of the housing 10 facing away from the cover plate 20 also mounted in the designated location. The cover plate 20 is positioned facing away from the mounting position of the housing 10, and the arrangement of the housing 10 and the cover plate 20 is perpendicular to the direction of gravity. In another embodiment, the power converter 100 is placed horizontally in a designated location, with the side of the housing 10 facing away from the cover plate 20 also placed horizontally in the designated location. The cover plate 20 is positioned facing away from the ground, and the arrangement of the housing 10 and the cover plate 20 is parallel to the direction of gravity.

[0067] The enclosure 10 includes a base plate 12 and multiple side plates, which connect the base plate 12 and the cover plate 20. For example, the side plates include a first side plate 13, a second side plate 14, a third side plate 15, and a fourth side plate 16. The first side plate 13 and the second side plate 14 are arranged opposite each other along a first direction X, and the third side plate 15 and the fourth side plate 16 are arranged opposite each other along a second direction Y. The cover plate 20 is arranged opposite the base plate 12 along a third direction Z, meaning the arrangement direction of the cover plate 20 and the enclosure 10 is the third direction Z. The first side plate 13, the second side plate 14, the third side plate 15, and the fourth side plate 16 connect the base plate 12 and the cover plate 20 to enclose a receiving space. The first direction X can be the length direction of the power converter 100, the second direction Y can be the width direction of the power converter 100, and the third direction Z can be the height direction of the power converter 100. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0068] Please see Figure 4 and Figure 5 , Figure 4 for Figure 2 An enlarged view of point IV in the power converter 100 shown. Figure 5 This is a schematic diagram of the structure of a first locking piece 31 provided in one embodiment of this application. Further reference... Figure 2The power converter 100 also includes a first locking structure 30, which includes a first locking piece 31 and at least two first fasteners 32. The first locking piece 31 is disposed along at least one edge of the housing 10 away from the cover plate 20 or the cover plate 20 away from the housing 10. For example, the first locking piece 31 is disposed on at least one edge of the housing 10 away from the cover plate 20. Or, for example, the first locking piece 31 is disposed on at least one edge of the cover plate 20 away from the housing 10. Or, for example, the first locking piece 31 is disposed on at least one edge of the housing 10 away from the cover plate 20 and at least one edge of the cover plate 20 away from the housing 10. The edge of the housing 10 with the first locking piece 31 can be disposed opposite to the edge of the cover plate 20 with the first locking piece 31. At least two first fasteners 32 pass through the cover plate 20 and the housing 10 and are connected and fixed to the first locking plate 31. Along the length of the first locking plate 31, at least two first fasteners 32 are spaced apart on the first locking plate 31. The first locking plate 31 has an elongated structure, which allows at least two first fasteners 32 to be spaced apart on the first locking plate 31. This increases the contact area between the first locking plate 31 and the housing 10 or between the first locking plate 31 and the cover plate 20. When at least two first fasteners 32 pass through the housing 10 and the cover plate 20 and are connected and fixed to the first locking plate 31, the connection between the housing 10 and the cover plate 20 is strengthened, reducing the possibility of the cover plate 20 flying off. Furthermore, the number of first fasteners 32 on the first locking plate 31 and the spacing between two adjacent first fasteners 32 can be flexibly adjusted. When the power converter 100 malfunctions and the pressure in the space enclosed by the housing 10 and the cover plate 20 increases, a pressure relief point can be formed between two adjacent first fasteners 32 with a larger spacing. Moreover, the deformed housing 10 or cover plate 20 is blocked by the first locking plate 31 between two adjacent first fasteners 32, which can limit the deformation of the cover plate 20 or housing 10, thus improving the safety of the power converter 100.

[0069] Please see Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of a power converter 100 provided in an embodiment of this application. Figure 7This is a schematic diagram of the structure of the housing 10 and cover plate 20 after deformation, forming a first pressure relief port 17, according to an embodiment of this application. After the first locking structure 30 fixes the housing 10 and cover plate 20, the housing 10 and cover plate 20 between at least one pair of adjacent first fasteners 32 (e.g., between two adjacent first fasteners 32 with a large gap) are configured to deform under the impact force inside the housing 10, so that a first pressure relief port 17 is formed between the deformed housing 10 and cover plate 20. After the power converter 100 fails, a combustion explosion occurs inside the power converter 100, and the internal pressure of the space enclosed by the housing 10 and cover plate 20 increases. The housing 10 and cover plate 20 are deformed by the explosion impact. The housing 10 and cover plate 20 between two adjacent first fasteners 32 with a large gap deform under the action of the impact force, forming a first pressure relief port 17 to release the internal pressure of the housing 10. Furthermore, the first locking piece 31 between two adjacent first fasteners 32 with a large spacing can constrain the size of the first pressure relief port 17, such as the size of the first pressure relief port 17 along the third direction Z, to prevent the operator's hand from reaching into the box 10 and causing secondary harm. At the same time, it can reduce or avoid the risk of components flying out of the box 10, greatly improving the safety of the power converter 100.

[0070] Please see Figure 2 , Figure 8 and Figure 9 , Figure 8 This is a top view of a power converter 100 provided in an embodiment of this application. Figure 9 for Figure 8 The diagram shows a cross-sectional view of the power converter 100 along line AA. In one embodiment, the first locking piece 31 can be fixed to the housing 10 by means of riveting, welding, bonding, or snap-fitting. A first fastener 32 can pass through the cover plate 20 and the housing 10 from one side, and then be connected and fixed to the first locking piece 31, thus achieving the connection and fixation of the cover plate 20 and the housing 10. In another embodiment, the first locking piece 31 can be fixed to the side of the cover plate 20 facing away from the housing 10, and can be fixed to the cover plate 20 by means of riveting, welding, bonding, or snap-fitting. A first fastener 32 can pass through the housing 10 and the cover plate 20 from one side, and then be connected and fixed to the first locking piece 31. This application uses the example of the first locking piece 31 being fixed to the housing 10 for detailed description.

[0071] Please see Figure 10 , Figure 10This is a schematic diagram of a power converter 100 according to an embodiment of this application. In one embodiment, at least one of the first side plate 13 and the second side plate 14 is connected and fixed to the cover plate 20 by a first locking structure 30. In another embodiment, the housing 10 includes a first edge 131 and a second edge 141 disposed opposite to each other. For example, the first edge 131 and the second edge 141 are disposed opposite to each other in a first direction X. The end of the first side plate 13 facing the cover plate 20 has a first edge 131. The first edge 131 protrudes from the side of the first side plate 13 away from the interior of the housing 10. A portion of the first edge 131 is disposed opposite to the cover plate 20 in a third direction Z. The first edge 131 is connected to the cover plate 20 by the first locking structure 30. The second side plate 14 has a second edge 141 at the end facing the cover plate 20. A portion of the second edge 141 is disposed opposite to the cover plate 20 in the third direction Z. The second edge 141 is connected to the cover plate 20 through the first locking structure 30. In this way, a controllable pressure relief point can be formed at the oppositely disposed first edge 131 and second edge 141. The other side panels of the housing 10 can be fixed to the cover plate 20 by multiple screws. The connection strength between the third side panel 15 and the cover plate 20, and the connection strength between the fourth side panel 16 and the cover plate 20, can both be greater than the connection strength of the first locking structure 30. That is to say, there is at least one pair of adjacent first fasteners 32 with a spacing greater than the spacing of any pair of adjacent screws among the multiple screws connecting the third side panel 15 and the cover plate 20, and there is at least one pair of adjacent first fasteners 32 with a spacing greater than the spacing of any pair of adjacent screws among the multiple screws connecting the fourth side panel 16 and the cover plate 20. When the power converter 100 explodes, the screws at the third side panel 15 and the fourth side panel 16 can pull the cover plate 20. On the first side panel 13 and the second side panel 14, while the first locking structure 30 pulls the cover plate 20, a pressure relief point can be formed between two adjacent first fasteners 32 with a large spacing on the same first locking piece 31. The power converter 100 can be depressurized from the first side panel 13 side and the second side panel 14 side. For example, the first side plate 13 or the second side plate 14 is provided with a first locking piece 31, and the other side plates are connected and fixed to the cover plate 20 by multiple screws. The connection strength between the housing 10 and the cover plate 20 at the multiple screws is greater than the connection strength between the housing 10 and the cover plate 20 at the first locking structure 30, so that the power converter 100 is suitable for explosion-proof requirements with low hydrogen concentration.

[0072] The first edge 131 and the second edge 141 can be flat plate structures, that is, the first edge 131 protrudes from the side opposite to the second side plate 14 along the first direction X relative to the first side plate 13, and the second edge 141 protrudes from the side opposite to the first side plate 13 along the first direction X relative to the second side plate 14. The first edge 131 and the second edge 141 can also be in an "L" shape. That is, a part of the first edge 131 protrudes from the side opposite to the second side plate 14 along the first direction X relative to the first side plate 13 and is positioned opposite to the cover plate 20, so that a part of the first edge 131 is connected and fixed to the cover plate 20 through the first locking structure 30, and the other part of the first edge 131 protrudes from the side opposite to the cover plate 20 along the third direction Z relative to a part of the first edge 131; a part of the second edge 141 protrudes from the side opposite to the first side plate 13 along the first direction X relative to the second side plate 14 and is positioned opposite to the cover plate 20, so that a part of the second edge 141 is connected and fixed to the cover plate 20 through the first locking structure 30, and the other part of the second edge 141 protrudes from the side opposite to the cover plate 20 along the third direction Z relative to a part of the second edge 141.

[0073] The length direction of the first edge 131 and the second edge 141 is the second direction Y. When the first locking piece 31 is fixed to the first edge 131 and the second edge 141, the length direction of the first locking piece 31 is the same as the length direction of the first edge 131 and the length direction of the second edge 141. The ratio of the length of the first locking piece 31 to the length of the edge where the first locking piece 31 is located is greater than or equal to 0.5 and less than 1. That is, for the first locking piece 31 fixed at the first edge 131, the ratio of its length to the length of the first edge 131 is greater than or equal to 0.5 and less than 1. The ratio of the lengths of the two can be less than 1; for example, the ratio of their lengths can be 0.5, 0.6, 0.7, 0.8, or 0.9. For the first locking piece 31 fixed at the second edge 141, the ratio of its length to the length of the second edge 141 is greater than or equal to 0.5 and less than 1. For example, the ratio of their lengths can be 0.5, 0.6, 0.7, 0.8, or 0.9. The length of the first edge 131 is the dimension of the first edge 131 in the second direction Y, and the length of the second edge 141 is the dimension of the second edge 141 in the second direction Y. For example, when both the first edge 131 and the second edge 141 are provided with a first locking piece 31, the ratio of the length of the first locking piece 31 to the length of the edge where the first locking piece 31 is located is greater than or equal to 0.5 and less than 1. For example, when both the first edge 131 and the second edge 141 are provided with a first locking piece 31 and other fixing structures (such as screws), the ratio of the length of the first locking piece 31 to the length of the edge where the first locking piece 31 is located can be greater than or equal to 0.5 and less than 1; or, both the first edge 131 and the second edge 141 are provided with at least a plurality of first locking pieces 31, wherein there is one first locking piece 31 whose length to the length of the edge where it is located can be greater than or equal to 0.5 and less than 1. Preferably, this first locking piece 31 can be located in the middle of the edge where it is located. The first locking piece 31 can be centrally located at the first edge 131 and the second edge 141. At the first edge 131 and the second edge 141, the longer first locking piece 31 can provide a larger bearing surface, distributing the concentrated force of at least two first fasteners 32 to the elongated first locking piece 31, avoiding excessive local pressure. Furthermore, the elongated first locking piece 31 can be quickly installed onto the housing 10 or the cover plate 20, making operation simple and preventing misalignment. In addition, by controlling the spacing between at least two first fasteners 32 on the first locking piece 31, controllable pressure relief at the first edge 131 and the second edge 141 can be achieved, effectively improving the explosion-proof performance of the power converter 100.

[0074] In other embodiments, a plurality of first locking pieces 31 are provided on the same edge of the housing 10, wherein the connection strength between the housing 10 and the cover plate 20 at the first locking pieces 31 at both ends of the edge is less than the connection strength between the housing 10 and the cover plate 20 at other first locking pieces 31. For example, the first edge 131 is provided with three first locking pieces 31, and the connection strength between the housing 10 and the cover plate 20 at the first locking pieces 31 on both sides is less than the connection strength between the housing 10 and the cover plate 20 at the first locking piece 31 in the middle, so that the middle first locking piece 31 can limit the size of the first pressure relief port 17 between the first locking pieces 31 on both sides in the third direction Z under the impact force inside the housing 10.

[0075] The first locking piece 31 can be a long strip of sheet metal to increase its structural strength. Furthermore, the contact surface between the first locking piece 31 and the housing 10 or the cover plate 20 can be increased to increase the contact area between the first locking piece 31 and the housing 10 or the cover plate 20.

[0076] Please return to the reference. Figure 5 In one embodiment, the first locking piece 31 includes a first flat plate portion 311 and a first bent portion 312. The first flat plate portion 311 has a flat structure and is connected to the first fastener 32. One of the housing 10 and the cover plate 20 is in contact with the first flat plate portion 311; for example, the larger surface of the first flat plate portion 311 contacts the surface of the housing 10, increasing the contact area between the first flat plate portion 311 and the housing 10. The first bent portion 312 is disposed at opposite ends of the first flat plate portion 311 along the length direction of the first locking piece 311. The first bent portion 312 is bent relative to the first flat plate portion 311. When the first locking piece 31 is attached to the housing 10, the first bent portion 312 is bent away from the contact position between the first flat plate portion 311 and the housing 10; when the first locking piece 31 is attached to the cover plate 20, the first bent portion 312 is bent away from the contact position between the first flat plate portion 311 and the cover plate 20. When the power converter 100 explodes, causing deformation of the housing 10 and cover 20, the deformation of the housing 10 or cover 20 applies a force to the first flat plate portion 311. The stress of the first flat plate portion 311 is effectively transferred to the first bending portions 312 at both ends, thereby significantly reducing the risk of breakage of the first flat plate portion 311. This allows the first flat plate portion 311 to effectively limit the deformation of the housing 10 or cover 20 and control the dimension of the first pressure relief port 17 along the third direction Z. The first bending portions 312 located at opposite ends of the first flat plate portion 311 greatly improve the overall bending resistance of the first locking plate 31, increase the structural strength of the first locking plate 31, and ensure the service life of the first locking plate 31.

[0077] Please see Figure 11 , Figure 11This is a schematic diagram of another first locking piece 31 provided in one embodiment of this application. In another embodiment, the first locking piece 31 is a long strip-shaped flat plate structure, and the large surface of the first locking piece 31 is attached to the surface of the housing 10. The first locking piece 31 can be enlarged and thickened to increase the structural strength of the first locking piece 31.

[0078] Please combine Figure 5 and Figure 11 The first locking piece 31 has a first through hole 313 and a first protruding ring 314 corresponding to the first through hole 313. The first through hole 313 corresponds to the first fastener 32 and penetrates both opposite sides of the first locking piece 31. When the first fastener 32 is a bolt or screw, the sidewall of the first through hole 313 can be threaded, so that the sidewall of the first through hole 313 can be threadedly connected with the first fastener 32. The first protruding ring 314 protrudes relative to the first locking piece 31, for example, the first protruding ring 314 protrudes relative to the surface of the first locking piece 31. The first protruding ring 314 can be integrally formed with the first locking piece 31, or the first protruding ring 314 can be fixed to the first locking piece 31 by welding, bonding, or other methods. The first convex ring 314 is located on the outer periphery of the first through hole 313. The first convex ring 314 has a hollow structure, and its interior communicates with the first through hole 313, allowing the first fastener 32 to pass through the first through hole 313 and connect with the side wall of the first convex ring 314. The inner wall of the first convex ring 314 is threaded, so the first fastener 32 can be connected and fixed to the side wall of the first through hole 313 and the side wall of the first convex ring 314, strengthening the connection strength between the first fastener 32 and the first locking piece 31, thereby strengthening the connection strength between the housing 10 and the cover plate 20.

[0079] It is understood that the number of first through holes 313 on the first locking plate 31 is the same as the number of at least two first fasteners 32 fixed on the first locking plate 31. For example, there are two first through holes 313, and the distance between the two first through holes 313 is greater than the distance between each first through hole 313 and its end closest to the first locking piece 31. In this way, the first locking piece 31 between the two first through holes 313 is pressed against the surface of the housing 10 under the action of the two first fasteners 32. When the internal pressure of the power converter 100 increases and causes the housing 10 to deform, the size of the first pressure relief port 17 along the arrangement direction of the first through holes 313 is as large as possible, while the first locking piece 31 between the two first through holes 313 restricts the size of the first pressure relief port 17 along the third direction Z, so that the first pressure relief port 17 between the two first through holes 313 is a narrow and elongated opening 11, which prevents the operator's hand from reaching into the housing 10 and causing secondary harm. At the same time, it can reduce or avoid the risk of components flying out of the housing 10, and can also effectively accelerate the release of air pressure inside the housing 10, thereby improving the explosion-proof performance of the power converter 100.

[0080] When the hydrogen concentration inside the housing 10 increases, the number of first through holes 313 on the first locking plate 31 can be increased, thereby increasing the number of corresponding first fasteners 32, so as to increase the number of first pressure relief ports 17, evenly distributing the energy released by the explosion inside the housing 10, and preventing the size of the first pressure relief port 17 along the third direction Z from being too large.

[0081] In one embodiment, when the first locking piece 31 is fixed on the housing 10, the first protruding ring 314 is disposed on the side of the first locking piece 31 facing away from the cover plate 20. In this way, the first locking piece 31 can fit against the housing 10. After the first fastener 32 passes through the cover plate 20 and the housing 10, it is then connected and fixed to the side wall of the first through hole 313 and the side wall of the first protruding ring 314.

[0082] In one embodiment, the first locking piece 31 has a notch located between two adjacent first fasteners 32. The notch provides a drainage channel for the corresponding locking piece. The notch can be located on both sides of the width of the first locking piece 31, where the width of the first locking piece 31 is less than its length. When the first locking piece 31 is exposed outside the housing 10, the notch on the first locking piece 31 provides a drainage channel, allowing water accumulated on the first locking piece 31 to drain smoothly from the notch. This prevents the first fasteners 32 on the first locking piece 31 from being damaged by water accumulation, ensuring the reliable connection between the housing 10 and the cover plate 20.

[0083] The first fastener 32 can be a bolt or a screw. When the first locking piece 31 is set on the housing 10, a part of the first fastener 32 passes through the cover plate 20 and the housing 10 and is threadedly connected to the first locking piece 31. The other part of the first fastener 32 is located on the side of the cover plate 20 away from the housing 10 and abuts against the cover plate 20 to fix the cover plate 20 and the housing 10.

[0084] Please see Figure 12 , Figure 12 for Figure 2The diagram shows an enlarged view of point XII in the power converter 100. The power converter 100 also includes a second locking structure 40, which includes a second locking piece 41 and a plurality of second fasteners 42. The second locking piece 41 is disposed along at least one edge of the housing 10 away from the cover plate 20 or the cover plate 20 away from the housing 10. For example, the second locking piece 41 is disposed at at least one edge of the housing 10 away from the cover plate 20; or, for example, the second locking piece 41 is disposed at at least one edge of the cover plate 20 away from the housing 10; or, for example, the housing 10 away from the cover plate 20 and the cover plate 20 away from the housing 10 both have the second locking piece 41 disposed thereon. The edge of the housing 10 with the second locking piece 41 can be disposed opposite to the edge of the cover plate 20 with the second locking piece 41. The second locking piece 41 and the first locking piece 31 surround the opening 11 of the housing 10. Figure 3 As shown, the second locking plate 41 and the first locking plate 31 are arranged around the perimeter of the opening 11 of the housing 10. Multiple second fasteners 42 pass through the cover plate 20 and the housing 10 and are connected and fixed to the second locking plate 41. The second locking plate 41 has an elongated structure, allowing multiple second fasteners 42 to be installed on it, increasing the contact area between the second locking plate 41 and the housing 10 or between the second locking plate 41 and the cover plate 20. When multiple second fasteners 42 pass through the cover plate 20 and the housing 10 and are connected and fixed to the second locking plate 41, the connection between the housing 10 and the cover plate 20 is strengthened. Among them, the spacing between at least one pair of adjacent first fasteners 32 is greater than the spacing between any pair of adjacent second fasteners 42 in the plurality of second fasteners 42, so that the connection strength between the housing 10 and the cover plate 20 at the second locking structure 40 is greater than the connection strength between the housing 10 and the cover plate 20 at the first locking structure 30, which further strengthens the connection strength between the housing 10 and the cover plate 20, and reduces the risk of the cover plate 20 flying out when the power converter 100 explodes.

[0085] In summary, the second locking structure 40 mainly serves to fix the housing 10 and the cover plate 20, while the first locking structure 30 strengthens the connection between the housing 10 and the cover plate 20. At the same time, the first locking pieces 31 between two adjacent first fasteners 32 with a large spacing allow the housing 10 and the cover plate 20 corresponding to the first locking pieces 31 to deform and form pressure relief points. The combination of the first locking structure 30 and the second locking structure 40 realizes the explosion-proof and explosion-relief functions of the power converter 100, improves the safety of the power converter 100, and effectively improves the explosion-proof performance of the power converter 100.

[0086] Please see Figure 13 , Figure 13 for Figure 8The diagram shows a cross-sectional view of the power converter 100 along line BB. In one embodiment, the second locking piece 41 can be fixed to the housing 10 by means of riveting, welding, bonding, or snap-fitting. A second fastener 42 can pass through one side of the cover plate 20 and the housing 10, and then be connected and fixed to the second locking piece 41, thus achieving the connection and fixation of the cover plate 20 and the housing 10. In another embodiment, the second locking piece 41 can be fixed to the side of the cover plate 20 facing away from the housing 10, and can be fixed to the cover plate 20 by means of riveting, welding, bonding, or snap-fitting. A second fastener 42 can pass through one side of the housing 10 and the cover plate 20, and then be connected and fixed to the second locking piece 41. This application uses the example of the second locking piece 41 being fixed to the housing 10 for detailed description.

[0087] The length of the second locking piece 41 may be greater than or equal to the length of the first locking piece 31. In other embodiments, the length of the second locking piece 41 may be less than the length of the first locking piece 31, and there is no specific limitation.

[0088] Please return to the reference. Figure 10 In one embodiment, the third side plate 15 and the fourth side plate 16 ( Figure 3At least one of the components (shown) is connected and fixed to the cover plate 20 via the second locking structure 40. In one embodiment, the housing 10 further includes a third edge 151 and a fourth edge 161 disposed opposite to each other, for example, the third edge 151 and the fourth edge 161 are disposed opposite to each other in the second direction Y. The end of the third side plate 15 facing the cover plate 20 is provided with a third edge 151, the third edge 151 protrudes from the side of the third side plate 15 away from the interior of the housing 10, a portion of the third edge 151 is disposed opposite to the cover plate 20 in the third direction Z, and the third edge 151 is connected to the cover plate 20 via the second locking structure 40. The end of the fourth side plate 16 facing the cover plate 20 is provided with a fourth edge 161, the fourth edge 161 protrudes from the side of the fourth side plate 16 away from the interior of the housing 10, a portion of the fourth edge 161 is disposed opposite to the cover plate 20 in the third direction Z, and the fourth edge 161 is connected to the cover plate 20 via the second locking structure 40. When the cover plate 20 is connected to the first edge 131 and the second edge 141 through the first locking structure 30, the connection strength at the relatively set third edge 151 and fourth edge 161 is better. When the power converter 100 is destroyed by combustion, the second locking structure 40 at the third edge 151 and the fourth edge 161 can better tighten the cover plate 20 and the housing 10. The third side plate 15 and the fourth side plate 16 are arranged opposite each other along the second direction Y (the width direction of the power converter 100). That is, the third edge 151 and the fourth edge 161 extend along the first direction X (the length direction of the power converter 100). When the length of the power converter 100 is greater than the width of the power converter 100, the length of the second locking piece 41 can be greater than the length of the first locking piece 31. Thus, a second locking piece 41 is provided on each of the third edge 151 and the fourth edge 161, and the number of second fasteners 42 corresponding to the second locking pieces 41 is increased to strengthen the connection strength between the third edge 151 and the cover plate 20 and the fourth edge 161 and the cover plate 20. When the power converter 100 explodes, the opposite fourth edges 161 and the fourth edge 161 pull the cover plate 20 through the second locking structure 40 to reduce the risk of the cover plate 20 flying out.

[0089] The third edge 151 and the fourth edge 161 can be flat plate structures, that is, the third edge 151 protrudes from the side opposite to the fourth side plate 16 along the first direction X relative to the third side plate 15, and the fourth edge 161 protrudes from the side opposite to the third side plate 15 along the first direction X relative to the fourth side plate 16. The third edge 151 and the fourth edge 161 can also be in an "L" shape. That is, a part of the third edge 151 protrudes from the side opposite to the fourth side plate 16 along the first direction X relative to the third side plate 15 and is positioned opposite to the cover plate 20, so that a part of the third edge 151 is connected and fixed to the cover plate 20 through the first locking structure 30, and another part of the third edge 151 protrudes from the side opposite to the cover plate 20 along the third direction Z relative to a part of the third edge 151; a part of the fourth edge 161 protrudes from the side opposite to the third side plate 15 along the first direction X relative to the fourth side plate 16 and is positioned opposite to the cover plate 20, so that a part of the fourth edge 161 is connected and fixed to the cover plate 20 through the first locking structure 30, and another part of the fourth edge 161 protrudes from the side opposite to the cover plate 20 along the third direction Z relative to a part of the fourth edge 161.

[0090] The length direction of the third edge 151 and the fourth edge 161 is the first direction X. When the second locking piece 41 is fixed to the third edge 151 and the fourth edge 161, the length direction of the second locking piece 41 is the same as the length direction of the third edge 151 and the length direction of the fourth edge 161. The ratio of the length of the second locking piece 41 to the length of the edge where the second locking piece 41 is located is greater than or equal to 0.5 and less than 1. That is to say, for the second locking piece 41 fixed at the third edge 151, the ratio of its length to the length of the third edge 151 is greater than or equal to 0.5 and less than 1. For example, the ratio of the two lengths can be 0.5, 0.6, 0.7, 0.8 or 0.9, etc.; for the second locking piece 41 fixed at the fourth edge 161, the ratio of its length to the length of the fourth edge 161 is greater than or equal to 0.5 and less than 1. For example, the ratio of the two lengths can be 0.5, 0.6, 0.7, 0.8 or 0.9, etc. The length of the third edge 151 is its dimension in the first direction X, and the length of the fourth edge 161 is its dimension in the first direction X. For example, a second locking piece 41 is provided at both the third edge 151 and the fourth edge 161, and the second locking piece 41 can be centrally positioned at the third edge 151 and the fourth edge 161. Alternatively, at least one of the third edge 151 and the fourth edge 161 may have multiple second locking pieces 41, where the ratio of the length of one second locking piece 41 to the length of its corresponding edge is greater than or equal to 0.5 and less than 1. In this way, at the third edge 151 and the fourth edge 161, the longer second locking piece 41 can provide a larger bearing surface, distributing the concentrated force of the multiple second fasteners 42 onto the elongated second locking piece 41, avoiding excessive local pressure. Furthermore, the elongated second locking piece 41 can be quickly installed onto the housing 10 or the cover plate 20, making operation simple and preventing misalignment. In addition, by controlling the spacing and number of the multiple second fasteners 42 on the second locking piece 41, the connection strength at the third edge 151 and the fourth edge 161 is strengthened.

[0091] The second locking piece 41 and the first locking piece 31 are spaced apart along the periphery of the opening 11 of the housing 10, and are fixed to different side plates of the housing 10. When the second locking piece 41 and the first locking piece 31 are arranged sequentially along the periphery of the opening 11 of the housing 10, for example, when the first side plate 13 and the second side plate 14 are each provided with a first locking piece 31, and the third side plate 15 and the fourth side plate 16 are each provided with a second locking piece 41, then the first locking piece 31, the second locking piece 41, and the first locking piece 31 and the second locking piece 41 are arranged sequentially along the direction of one circle around the opening 11 of the housing 10. Along the periphery of the opening 11 of the housing 10, the housing 10 and the cover plate 20 between the second locking plate 41 and the first locking plate 31 are configured to deform under internal impact force, thereby forming a second pressure relief port 18 between the deformed cover plate 20 and the housing 10. The second pressure relief port 18 and the first pressure relief port 17 are arranged along the periphery of the opening 11 of the housing 10. When the power converter 100 explodes and the internal pressure of the housing 10 increases, the connection strength between the cover plate 20 and the housing 10 at the first locking structure 30 and the second locking structure 40 is relatively large, and the cover plate 20 and the housing 10 are not easily deformed. In the direction around the opening 11 of the housing 10, there are no other devices connecting the cover plate 20 and the housing 10 between the second locking piece 41 and the first locking piece 31. The housing 10 and the cover plate 20 between adjacent first locking pieces 31 and second locking pieces 41 will deform first to form a second pressure relief port 18 to release the internal pressure of the housing 10.

[0092] In other embodiments, a plurality of first locking plates 31 may be provided on the same side panel of the housing 10, and a plurality of second locking plates 41 may be provided on the same side panel of the housing 10. Alternatively, a first locking plate 31 and a second locking plate 41 may be provided on the same side panel of the housing 10. In this case, along the periphery of the opening 11 of the housing 10, the housing 10 and the cover plate 20 between two adjacent locking plates are configured to deform under the impact force inside the housing 10, so that a second pressure relief port 18 is formed between the deformed housing 10 and the cover plate 20. For example, the first side plate 13 and the second side plate 14 are respectively provided with two first locking pieces 31, and the third side plate 15 and the fourth side plate 16 are respectively provided with two second locking pieces 41. At this time, along the periphery of the opening 11 of the box body 10, the box body 10 and the cover plate 20 between two adjacent first locking pieces 31, and the box body 10 and the cover plate 20 between adjacent second locking pieces 41 can also be deformed under the action of the impact force inside the box body 10, forming a second pressure relief port 18 respectively.

[0093] For example, the second locking piece 41 can be a long strip of sheet metal to increase its structural strength. Furthermore, the contact surface between the second locking piece 41 and the housing 10 or cover plate 20 can be increased to increase the contact area between the second locking piece 41 and the housing 10 or cover plate 20. When multiple second fasteners 42 are connected and fixed to the second locking piece 41, the risk of breakage of the second locking piece 41 is lower.

[0094] Please see Figure 10 and Figure 14 , Figure 14 This is a schematic diagram of the structure of a second locking piece 41 according to an embodiment of this application. In one embodiment, the second locking piece 41 includes a second flat plate portion 411 and a second bent portion 412. The second flat plate portion 411 has a flat plate structure and is connected to a second fastener 42. One of the housing 10 and the cover plate 20 is in contact with the second flat plate portion 411; for example, the larger surface of the second flat plate portion 411 contacts the surface of the housing 10, increasing the contact area between the second flat plate portion 411 and the housing 10. The second bending portion 412 is disposed at opposite ends of the second flat plate portion 411 along the length direction of the second locking piece 41. The second bending portion 412 is bent relative to the second flat plate portion 411. When the second locking piece 41 is attached to the housing 10, the second bending portion 412 is bent away from the contact position between the second flat plate portion 411 and the housing 10. When the second locking piece 41 is attached to the cover plate 20, the second bending portion 412 is bent away from the contact position between the second flat plate portion 411 and the cover plate 20. When the impact force inside the housing 10 acts on the housing 10 and the cover plate 20, the second flat plate portion 411 fixed to the housing 10 or the cover plate is also impacted. The stress of the second flat plate portion 411 can be effectively transferred to the second bending portion 412, thereby greatly reducing the risk of the second flat plate portion 411 breaking. Under the action of multiple second fasteners 42, the second flat plate portion 411 tightens the cover plate 20 and the housing 10, reducing the risk of the cover plate 20 flying off, thereby improving the safety of the power converter 100. The second bending portions 412 located at opposite ends of the second flat plate portion 411 greatly improve the overall bending resistance of the second locking plate 41, increase the structural strength of the second locking plate 41, and ensure the service life of the second locking plate 41.

[0095] Please see Figure 15 , Figure 15 This is a schematic diagram of another second locking piece 41 provided in one embodiment of this application. In another embodiment, the second locking piece 41 is a long strip-shaped flat plate structure, and the large surface of the second locking piece 41 is attached to the surface of the housing 10. The second locking piece 41 can be enlarged and thickened to increase the structural strength of the second locking piece 41.

[0096] Please combine Figure 14 and Figure 15 The second locking piece 41 has a second through hole 413 and a second protruding ring 414 corresponding to the second through hole 413. The second through hole 413 corresponds to the second fastener 42 and penetrates both opposite sides of the second locking piece 41. When the second fastener 42 is a bolt or screw, the sidewall of the second through hole 413 may be threaded, and the sidewall of the second through hole 413 may be threadedly connected to the second fastener 42. The second protruding ring 414 protrudes relative to the second locking piece 41, for example, the second protruding ring 414 protrudes relative to the surface of the second locking piece 41. The second protruding ring 414 may be integrally formed with the second locking piece 41, or the second protruding ring 414 may be fixed to the second locking piece 41 by welding, bonding, or other methods. The second convex ring 414 is located on the outer periphery of the second through hole 413. The second convex ring 414 has a hollow structure, and its interior communicates with the second through hole 413, allowing the second fastener 42 to pass through the second through hole 413 and connect with the side wall of the second convex ring 414. The inner wall surface of the second convex ring 414 is threaded, allowing the second fastener 42 to be connected and fixed to the side wall of the second through hole 413 and the second convex ring 414, thereby strengthening the connection between the second fastener 42 and the second locking piece 41, and thus strengthening the connection between the housing 10 and the cover plate 20.

[0097] The second locking piece 41 has a notch located between two adjacent second fasteners 42. When the second locking piece 41 is exposed outside the housing 10, the notch on the second locking piece 41 provides a drainage channel, allowing water accumulated on the second locking piece 41 to drain smoothly from the notch. In this way, the second fasteners 42 on the second locking piece 41 are less likely to be damaged by water accumulation, thus ensuring the reliability of the connection between the housing 10 and the cover plate 20.

[0098] Please combine Figure 14 and Figure 15 In this application, the second locking piece 41 has a notch 415 located between two adjacent second fasteners 42. This prevents the second fasteners 42 on the second locking piece 41 from being damaged by water accumulation, ensuring that the second locking structure 40 can hold the cover plate 20 in place under impact forces inside the housing 10, reducing the risk of the cover plate 20 flying off. For example, the second locking piece 41 has notches 415 formed on both opposite sides in its width direction.

[0099] The second fastener 42 can be a bolt or a screw. When the second locking piece 41 is installed on the housing 10, a portion of the second fastener 42 passes through the cover plate 20 and the housing 10 and is threadedly connected to the second locking piece 41. The other portion of the second fastener 42 is located on the side of the cover plate 20 away from the housing 10 and abuts against the cover plate 20 to fix the cover plate 20 and the housing 10.

[0100] Multiple second fasteners 42 can be spaced apart on the second locking plate 41. For example, multiple second fasteners 42 can be evenly distributed on the second locking plate 41, wherein the distance between two adjacent second fasteners 42 can be greater than the distance between two adjacent first fasteners 32 on the first locking plate 31. In this way, the pressure relief points of the power converter 100 are mainly distributed on the side wall where the first locking plate 31 is located, achieving controllable pressure relief. Alternatively, multiple second fasteners 42 can be fixed tightly to each other on the second locking plate 41, so that the second locking structure 40 can tighten the cover plate 20 and the housing 10, greatly reducing the risk of the cover plate 20 flying off.

[0101] In summary, in the embodiment where the first edge 131 and the second edge 141 are both connected to the cover plate 20 through a first locking structure 30, and the third edge 151 and the fourth edge 161 are both connected to the cover plate 20 through a second locking structure 40, when the power converter 100 explodes, a first pressure relief port 17 is formed at the opposite first edge 131 and the second edge 141. At the same time, since the first locking piece 31 and the second locking piece 41 are located at two adjacent edges around the opening 11 of the housing 10, and the second pressure relief port 18 between the first locking piece 31 and the second locking piece 41 is located at the corner of the housing 10, the gas inside the housing 10 can be released from the first pressure relief port 17 on both sides and the second pressure relief port 18 at the corner of the housing 10. For example, when the dimensions of the housing 10 are 1060*800*400mm, the power converter 100 passes the hydrogen explosion tests at 17% and 20% concentrations. Furthermore, the first locking plate 31 limits the dimension of the first pressure relief port 17 along the third direction Z to less than 50mm, meeting the explosion-proof 3.0 requirement and significantly improving the explosion-proof performance of the power converter 100. Through the first locking structure 30 and the second locking structure 40, the power converter 100 meets the hydrogen explosion design requirements, preventing the entire unit from exploding due to internal component failure and ensuring the safety of the surrounding environment and personnel.

[0102] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power converter, characterized by, The power converter is used to convert direct current from photovoltaic modules or energy storage batteries into alternating current, and to deliver the alternating current to the power grid or load; the power converter includes a housing, a cover plate and a first locking structure, the cover plate covering the opening of the housing; The first locking structure includes a first locking plate and at least two first fasteners. The first locking plate is disposed along at least one edge of the housing away from the cover plate or the cover plate away from the housing. The at least two first fasteners pass through the cover plate and the housing and are connected and fixed to the first locking plate. Along the length direction of the first locking plate, the at least two first fasteners are spaced apart from the first locking plate.

2. The power converter of claim 1, wherein, The housing and the cover plate, which are located between at least one pair of adjacent first fasteners, are configured to deform when subjected to an internal impact force, thereby forming a first pressure relief port between the deformed cover plate and the housing.

3. The power converter of claim 1, wherein, The first locking piece includes a first flat plate portion and a first bent portion. The first bent portion is disposed at opposite ends of the first flat plate portion along the length direction of the first locking piece. The first bent portion is bent relative to the first flat plate portion. The housing or the cover plate is fitted with the first flat plate portion. The first flat plate portion is connected to the first fastener.

4. The power converter of claim 1, wherein, The first locking piece has a first through hole and a first protruding ring corresponding to the first through hole. The first through hole corresponds to the first fastener. The first protruding ring protrudes from the first locking piece. The first fastener passes through the corresponding first through hole and is connected and fixed to the first protruding ring.

5. The power converter of claim 1, wherein, The ratio of the length of the first locking piece to the length of the edge where the first locking piece is located is greater than or equal to 0.5 and less than 1.

6. The power converter of claim 1, wherein, The first locking piece has a notch located between two adjacent first fasteners.

7. The power converter of claim 2, wherein, The power converter further includes a second locking structure, which includes a second locking plate and a plurality of second fasteners. The second locking plate is disposed along at least one edge of the housing away from the cover plate or the cover plate away from the housing. The second locking plate and the first locking plate are arranged around the opening of the housing. Among the at least two first fasteners, the spacing between at least one pair of adjacent first fasteners is greater than the spacing between any pair of adjacent second fasteners among the plurality of second fasteners. The plurality of second fasteners pass through the cover plate and the housing and are connected and fixed to the second locking plate. The plurality of second fasteners are disposed on the second locking plate.

8. The power converter of claim 7, wherein, Along the periphery of the opening of the housing, the housing and the cover plate between the second locking piece and the first locking piece are configured to deform under impact force from inside the housing, so as to form a second pressure relief port between the deformed cover plate and the housing, the second pressure relief port and the first pressure relief port being arranged along the periphery of the opening of the housing.

9. The power converter of claim 7, wherein, The second locking piece includes a second flat plate portion and a second bent portion. The second bent portion is disposed at opposite ends of the second flat plate portion along the length direction of the second locking piece. The second bent portion is bent relative to the second flat plate portion. The housing or the cover plate is fitted with the second flat plate portion. The second flat plate portion is connected to the second fastener.

10. The power converter of claim 7, wherein, The second locking piece is provided with a second through hole and a second protruding ring corresponding to the second through hole. The second through hole corresponds to the second fastener. The second fastener passes through the corresponding second through hole and is connected and fixed to the second protruding ring.

11. The power converter of claim 7, wherein, The second locking piece has a notch located between two adjacent second fasteners.

12. The power converter of claim 7, wherein, The housing includes a first edge and a second edge arranged opposite to each other, as well as a third edge and a fourth edge arranged opposite to each other. The first edge and the second edge are both connected to the cover plate through the first locking structure, and the third edge and the fourth edge are both connected to the cover plate through the second locking structure.

13. The power converter of claim 7, wherein, The ratio of the length of the second locking piece to the length of the edge where the second locking piece is located is greater than or equal to 0.5 and less than 1.

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