Composite busbar for photovoltaic inverter

Abstract

The utility model relates to a composite busbar for a photovoltaic inverter. The composite busbar comprises a busbar main body, polar plate terminals and a positioning and supporting device, the busbar main body comprises a first pole plate, a second pole plate, a third pole plate and an insulating film. The polar plate terminal comprises a first terminal, a second terminal and a third terminal. And the first terminal, the second terminal and the third terminal are arranged on the same side of the busbar main body. The positioning and supporting device comprises a positioning hole and a sinking platform insulation sleeve. According to the composite busbar for the photovoltaic inverter, the installation distance between polarities is increased through the arrangement of the trifurcate polar plate terminals, the installation difficulty of power devices is reduced, the requirement for high-current-carrying operation is met through the sufficient lap joint area, and the voltage resistance performance of the connecting position is improved; the positioning holes and the sinking platform insulating sleeves are arranged to ensure that the external supporting columns are accurate in guiding and positioning, and locking is convenient.

Description

Technical Field

[0001] The utility model relates to the field of composite busbars, in particular to a composite busbar for a photovoltaic inverter. Background Art

[0002] The composite busbar improves on traditional cables and copper bars, connects multiple IGBT module devices by stacking three-phase plates flatly, and uses the principle of parallel electromagnetic field cancellation of overlapping plates to significantly reduce the distributed inductance in the line. The flat cross-section of the composite busbar ensures that the busbar can achieve high current carrying, high heat dissipation and low temperature rise.

[0003] There is a composite busbar suitable for a three-level inverter circuit with an authorization announcement number of CN217693104U on the China Patent Network. The composite busbar suitable for a three-level inverter circuit includes a composite busbar body, and the composite busbar body includes a first busbar, a second busbar and a third busbar. A first signal pin is connected to one side of the first busbar. A second signal pin is provided on the side of the second busbar close to the first signal pin. A third signal pin is provided on the side of the third busbar close to the first signal pin. An insulating layer that can effectively guarantee the service life is provided at the bottom of the first busbar, the top of the third busbar, and the positions between the first busbar, the second busbar and the third busbar. By providing an insulating layer, the composite busbar can effectively and timely conduct away the generated heat when in use, and at the same time can effectively avoid shortening the service life of the composite busbar due to the excessively high internal temperature of the composite busbar, and can avoid short circuits and other risks.

[0004] However, the composite busbar is compactly installed with the three-level inverter circuit, and the overlap distance is small, which not only reduces the current carrying capacity of the overlap between the composite busbar and the three-level inverter circuit, but also increases the difficulty of installation. Utility Model Content

[0005] In view of this, the utility model provides a composite busbar for a photovoltaic inverter to solve the above problems.

[0006] A composite busbar for a photovoltaic inverter includes a busbar body, a plurality of plate terminals arranged on the busbar body, and a positioning support device arranged on the busbar body. The busbar body includes a first plate, a second plate, a third plate, and insulating films respectively arranged between the first plate, the second plate, and the third plate, which are stacked in sequence. The first plate includes a first plate body, a plurality of copper pillars arranged on the first plate body, and a plurality of embedded insulating sleeves arranged on the copper pillars in the arrangement direction of the busbar body. The second plate includes a second plate body, a plurality of second copper pillars arranged on the second plate body, and a plurality of second embedded insulating sleeves arranged on the second plate body. The third plate includes a third plate body, a plurality of third copper pillars arranged on the third plate body, and a plurality of third embedded insulating sleeves arranged on the third plate body. The plate terminals include a first terminal arranged at one end of the first plate, a second terminal arranged at one end of the second plate, and a third terminal arranged at one end of the third plate. The first terminal, the second terminal and the third terminal are arranged on the same side of the busbar body. The first terminal, the second terminal and the third terminal form a trident structure, and the bending directions of the first terminal and the third terminal are opposite. The first terminal is provided with a bend, wherein a multi-layer bend is provided on the side of the first terminal away from the first plate. The second terminal is arranged below the first terminal and is arranged at a distance from the first terminal. The second terminal is provided with a multi-layer bend, and the second terminal is opened and bent in the direction of the first terminal. The third terminal is provided with a multi-layer bend, the third terminal is arranged below the second terminal, and the third terminal is bent in the direction toward the second terminal. The spacing between the third terminal and the second terminal is the same as the spacing between the first terminal and the second terminal. The positioning support device is arranged on the side of the busbar body perpendicular to the plate terminal. The positioning support device includes at least one positioning hole arranged on the second plate and a sink insulating sleeve arranged on the first and third plates. A plurality of the positioning holes are arranged in a straight line on the second plate, and the plurality of the positioning holes are perpendicular to the plurality of the embedded insulating sleeves. The diameter of the positioning hole is the same as the diameter of the locking structure required for installation. The central axis of the sinker insulating sleeve and the central axis of the positioning hole are arranged on the same straight line, so that the positioning hole and the sinker insulating sleeve are aligned in the direction in which the busbar body is arranged. The inner diameter of the sinker insulating sleeve is the same as the diameter of the locking structure.

[0007] Compared with the prior art, the composite busbar for photovoltaic inverter provided by the utility model is arranged at the overlap of the three-pole phase of the busbar by setting the three-pronged plate terminal. The sufficient overlap area satisfies high current operation and improves the withstand voltage performance of the connection. At the same time, the three-pronged plate terminal increases the safety distance between polarities, reduces the difficulty of power device installation, and improves installation efficiency. The first terminal, the second terminal, and the third terminal are parallel to each other. By overlapping and laying the three terminals together to connect the three-phase energy storage converter, the principle of parallel electromagnetic field cancellation of the overlapping plates is used to greatly reduce the distributed inductance in the circuit. The positioning hole and the sink insulating sleeve are mutually positioned to ensure that the external support column is accurately guided and positioned, which is convenient for locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 The utility model provides a schematic structural diagram of a composite busbar for a photovoltaic inverter.

[0009] Figure 2 for Figure 1 Structural breakdown diagram. DETAILED DESCRIPTION

[0010] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0011] See also Figure 1 to Figure 2 , which is a schematic diagram of the structure of a composite busbar for a photovoltaic inverter provided by the utility model. The composite busbar for a photovoltaic inverter includes a busbar body 10, a plurality of plate terminals 20 arranged on the busbar body 10, and a positioning support device 30 arranged on the busbar body 10. It can be imagined that the composite busbar for a photovoltaic inverter also includes some other functional modules, such as molding components, injection molding components, etc., which are well known to those skilled in the art and will not be repeated here.

[0012] The busbar body 10 includes a first electrode plate 11 , a second electrode plate 12 , a third electrode plate 13 stacked in sequence, and an insulating film 14 disposed between the first electrode plate 11 , the second electrode plate 12 , and the third electrode plate 13 .

[0013] The first electrode 11 includes a first electrode body 111 , a plurality of copper pillars 112 disposed on the first electrode body 111 , and a plurality of embedded insulating sleeves 113 disposed on the copper pillars 112 in the arrangement direction of the first electrode body 111 .

[0014] The first plate body 111 uses metal as a conductor for current conduction, preferably copper, which has excellent electrical conductivity, thermal conductivity, ductility and corrosion resistance, and has a wide range of applications. In this embodiment, the shape of the first plate body 111 is a long rectangle, and the structure of the first plate body 111 is compact. It can be imagined that the shape of the first plate body 111 is also circular or triangular according to the equipment environment in which the busbar body 10 is installed. The copper column 112 is arranged in a straight line with the embedded insulating sleeve 113, and a plurality of the copper columns 112 arranged in a straight line are arranged parallel to the embedded insulating sleeve 113 on the first plate 11. The copper column 112 overlaps with other components, so that the busbar body 10 can function. The embedded insulating sleeve 113 is nested in the first plate 11 by setting a mounting hole on the first plate 11. The central axis of the embedded insulating sleeve 113 and the central axis of the mounting hole are arranged on the same straight line.

[0015] The second electrode 12 includes a second electrode body 121, a plurality of second copper pillars 122 arranged on the second electrode body 121, and a plurality of second embedded insulating sleeves 123 arranged on the second electrode body 121. The second electrode 12 has the same function and structure as the first electrode 11, except that the second copper pillar 122 arranged on the second electrode 12 is misaligned with the copper pillar 112 arranged on the first electrode 11. The shape of the second electrode body 121 is the same as that of the first electrode body 111, which facilitates the overlapping installation of the first electrode body 111 and the second electrode 12, and thus facilitates integrated compression. The copper pillar 112, the second copper pillar 122 and the embedded insulating sleeve 113, the second embedded insulating sleeve 123 are arranged in a general technology and are not described here. The third electrode 13 includes a third electrode body 131, a plurality of third copper pillars 132 arranged on the third electrode body 131, and a plurality of third embedded insulating sleeves 133 arranged on the third electrode body 131. The third electrode plate 13 has the same function and structure as the first and second electrode plates 11 and 12, except that the third copper pillar 132 on the third electrode plate 13 is misaligned with the copper pillar 112 and the second copper pillar 122 on the first and second electrode plates 11 and 12. The third copper pillar 132 on the third electrode plate 13 is inserted into the second embedded insulating sleeve 123 of the second electrode plate 12, and the second copper pillar 122 of the second electrode plate 12 is inserted into the embedded insulating sleeve 113 of the first electrode plate 11, thereby achieving connection and fixation between the three electrode plates.

[0016] The insulating film 14 is shaped according to the components provided on the busbar device, so that the insulating film 14 ensures the insulation of the busbar body 10 without affecting the connection between the busbar body 10 and other components.

[0017] The electrode terminal 20 includes a first terminal 21 disposed at one end of the first electrode 11 , a second terminal 22 disposed at one end of the second electrode 12 , and a third terminal 23 disposed at one end of the third electrode 13 .

[0018] The first terminal 21, the second terminal 22, and the third terminal 23 are arranged on the same side of the busbar body 10 so as to be connected to the photovoltaic three-phase energy storage converter. The first terminal 21 and the third terminal 23 are bent in opposite directions, so that the first terminal 21, the second terminal 22, and the third terminal 23 form a trident structure.

[0019] The first terminal 21 has multiple bends. In this embodiment, the first terminal 21 has two bends, wherein the first terminal 21 is away from the bend of the first electrode plate 11 and is used to connect one end of the three-phase energy storage converter.

[0020] The second terminal 22 is provided with multiple layers of bends. The second terminal 22 is arranged below the first terminal 21 and is spaced apart from the first terminal 21. In this embodiment, the second terminal 22 is provided with a bend, which is used to connect one end of the three-phase energy storage converter. The second terminal 22 is open and bent toward the direction of the first terminal 21.

[0021] The third terminal 23 is provided with multiple layers of bends. The third terminal 23 is arranged below the second terminal 22, and the third terminal 23 is bent in the direction toward the second terminal 22. The distance between the third terminal 23 and the second terminal 22 is the same as the distance between the first terminal 21 and the second terminal 22. In this embodiment, the third terminal 23 is provided with two bends, and the third terminal 23 is connected to one end of the three-phase energy storage converter on the side away from the first plate 11. The first, second, and third plates 11, 12, and 13 are bent to increase the installation distance between the busbar body 10 and the overlap compared to direct overlap, reduce the installation difficulty, and increase the overlap area with the photovoltaic inverter to meet the high current carrying requirements, thereby increasing the pressure resistance of the connection. In addition, the first terminal 21, the second terminal 22, and the third terminal 23 are parallel to each other, and the three-phase energy storage converter is connected by overlapping and paving the three terminals, and the distributed inductance in the circuit is greatly reduced by using the principle of parallel electromagnetic field cancellation of overlapping plates.

[0022] The positioning support device 30 is disposed on the side of the busbar body 10 perpendicular to the electrode terminal 20. The positioning support device 30 includes at least one positioning hole 31 disposed on the second electrode plate 12 and a sink insulating sleeve 32 disposed on the first and third electrode plates 13.

[0023] The plurality of positioning holes 31 are arranged in a straight line on the second electrode plate 12, and the plurality of positioning holes 31 are perpendicular to the plurality of embedded insulating sleeves 113. The diameter of the positioning holes 31 is the same as the diameter of the locking structure required for installation, so that the locking device will not be displaced.

[0024] A plurality of sinkers are provided inside the sinker insulating sleeves 32, and the middle of the sinker is hollowed out and cylindrical. The central axis of the sinker insulating sleeve 32 is arranged on the same straight line as the central axis of the positioning hole 31, so that the positioning hole 31 and the sinker insulating sleeve 32 are aligned in the direction in which the busbar body 10 is arranged. The inner diameter of the sinker insulating sleeve 32 is the same as the diameter of the locking structure, so that the locking structure can only pass through the sinker of the sinker insulating sleeve 32, and the positioning hole 31 fixes and supports the first, second, and third pole plates 11, 12, and 13 to guide the installation of the first, second, and third pole plates 11, 12, and 13. The overall structure ensures reliable insulation between the three-phase pole plates and accurate support positioning.

[0025] Compared with the prior art, the composite busbar for photovoltaic inverter provided by the utility model is provided with a three-pronged plate terminal 20 at the overlap of the three-pole phase of the busbar. The sufficient overlap area satisfies high current operation and improves the withstand voltage performance of the connection. At the same time, the three-pronged plate terminal 20 increases the safety distance between polarities, reduces the difficulty of power device installation, and improves installation efficiency. The first terminal 21, the second terminal 22, and the third terminal 23 are parallel to each other. By overlapping and paving the three-phase energy storage converter, the distributed inductance in the circuit is greatly reduced by using the principle of parallel electromagnetic field cancellation of the overlapping plates. The positioning hole 31 and the sinker insulating sleeve 32 are mutually positioned to ensure that the external support column is accurately guided and positioned for easy locking.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A composite busbar for a photovoltaic inverter, characterized in that: The composite busbar for the photovoltaic inverter includes a busbar body, a plurality of plate terminals arranged on the busbar body, and a positioning support device arranged on the busbar body. The busbar body includes a first plate, a second plate, a third plate stacked in sequence, and insulating films respectively arranged between the first plate, the second plate, and the third plate. The first plate includes a first plate body, a plurality of copper pillars arranged on the first plate body, and a plurality of embedded insulating sleeves arranged on the copper pillars in the arrangement direction of the busbar body. The second plate includes a second plate body, a plurality of copper pillars arranged on the second plate body, and a plurality of copper pillars arranged on the copper pillars in the arrangement direction of the busbar body. The second copper column on the electrode body, a plurality of second embedded insulating sleeves arranged on the second electrode body, the third electrode plate includes a third electrode body, a plurality of third copper columns arranged on the third electrode body, and a plurality of third embedded insulating sleeves arranged on the third electrode body, the electrode terminal includes a first terminal arranged at one end of the first electrode plate, a second terminal arranged at one end of the second electrode plate, and a third terminal arranged at one end of the third electrode plate, the first terminal, the second terminal, and the third terminal are arranged on the same side of the busbar body, the first terminal, the second terminal, and the third terminal form a trident structure, and the first terminal The first terminal is provided with a bend in a direction opposite to the bending direction of the third terminal, wherein a plurality of bends are provided on a side of the first terminal away from the first electrode plate, the second terminal is provided below the first terminal and is spaced apart from the first terminal, the second terminal is provided with a plurality of bends, the second terminal is openly bent in the direction of the first terminal, the third terminal is provided with a plurality of bends, the third terminal is provided with a plurality of bends, the third terminal is provided below the second terminal, the third terminal is bent in a direction toward the second terminal, the spacing between the third terminal and the second terminal is the same as the spacing between the first terminal and the second terminal, the positioning support device is provided on the side of the busbar body perpendicular to the electrode plate terminal, the positioning support device includes at least one positioning hole provided on the second electrode plate and a sinker insulating sleeve provided on the first and third electrodes, a plurality of the positioning holes are provided in a straight line on the second electrode plate, a plurality of the positioning holes are perpendicular to a plurality of the embedded insulating sleeves, the diameter of the positioning hole is the same as the diameter of the locking structure required for installation, the central axis of the sinker insulating sleeve is provided on the same straight line as the central axis of the positioning hole, so that the positioning hole and the sinker insulating sleeve are aligned in the direction in which the busbar body is arranged, and the inner diameter of the sinker insulating sleeve is the same as the diameter of the locking structure.

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