Busbar assembly of power module, power module, and power conversion device

Abstract

The embodiment of the utility model provides a busbar assembly of a power module, the power module with the busbar assembly and an electric power conversion device with the power module. The busbar assembly comprises a first busbar, a second busbar and a capacitor. The first busbar and the second busbar are electrically connected with at least one capacitor. The first busbar is electrically connected with the second busbar, and the first busbar and the second busbar are arranged at an included angle. As the busbar assembly comprises the first busbar and the second busbar which are electrically connected and arranged at the included angle, the first busbar and the second busbar can respectively have proper included angles relative to the first heat dissipation plate and the second heat dissipation plate. Therefore, the circuit from the first device group to the busbar assembly and the circuit from the second device group to the busbar assembly on any one of the first heat dissipation plate and the second heat dissipation plate are short, and the length difference between the two circuits is small. And the length difference between the short circuit and the small circuit is beneficial to reducing stray inductance.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the field of power electronics technology, and in particular, to a busbar assembly of a power module, a power module having the busbar assembly, and a power conversion device having the power module. Background Art

[0002] Power converters convert direct current (DC) to alternating current (AC) and are widely used in power generation, transmission, and consumption. For example, they can be found in electric vehicles, acting as a bridge between the battery system and the grid / load.

[0003] The power module is the core component of a power conversion device, typically consisting of a busbar and the capacitors and components electrically connected to it. Stray inductance in the power module circuitry can affect current balancing, negatively impacting the performance of the power conversion device. Therefore, there is a need for improvements in reducing stray inductance. Utility Model Content

[0004] In view of this, embodiments of the present invention provide a busbar assembly of a power module, a power module having the busbar assembly, and a power conversion device having the power module, so as to at least improve the problem of high stray inductance in the power module circuit.

[0005] In one aspect, embodiments of the present invention provide a busbar assembly for a power module. The busbar assembly includes a first busbar, a second busbar, and a capacitor. The first busbar and the second busbar are each electrically connected to at least one capacitor. The first busbar is electrically connected to the second busbar, and the first busbar and the second busbar are arranged at an angle.

[0006] In some embodiments, a lug portion is formed on one side edge of the first busbar protruding toward the second busbar, and a lug portion is also formed on one side edge of the second busbar protruding toward the first busbar, and the lug portion of the first busbar is connected to the lug portion of the second busbar.

[0007] In some embodiments, the lug portion of the first busbar is stacked with the lug portion of the second busbar, and the busbar assembly further includes a fastener that passes through the lug portion of the first busbar and the lug portion of the second busbar to connect the two.

[0008] In some embodiments, each busbar includes a stacked positive electrode plate and a negative electrode plate, and each busbar is provided with a plurality of lugs. The plurality of lugs include positive lugs provided by the positive electrode plates and negative lugs provided by the negative electrode plates. The positive lugs of a first busbar are connected to the positive lugs of a second busbar, and the negative lugs of the first busbar are connected to the negative lugs of the second busbar.

[0009] In some embodiments, each busbar has a plurality of positive tab portions and a plurality of negative tab portions, the plurality of positive tab portions and the plurality of negative tab portions are alternately arranged, and any adjacent positive tab portions and negative tab portions are spaced apart.

[0010] In some embodiments, each busbar further includes a neutral plate stacked with the positive plate and the negative plate, and the neutral plate of the first busbar is spaced apart from or electrically connected to the neutral plate of the second busbar.

[0011] In some embodiments, the first busbar and the second busbar have an included angle α, and the included angle α satisfies: 80°≤α≤160°.

[0012] On the other hand, an embodiment of the present invention further provides a power module, which includes the aforementioned busbar assembly.

[0013] In some embodiments, the power module further includes a first heat sink, a second heat sink, a third heat sink, a first component group, a second component group, and a third component group. A first component group is provided on one side of the first heat sink in the thickness direction, and the first component group on the first heat sink is connected to the first busbar. A second component group is provided on one side of the second heat sink in the thickness direction, and the second component group on the second heat sink is connected to the second busbar. A third component group is provided on one side of the third heat sink in the thickness direction, and the first component group on the first heat sink is electrically connected to the second component group on the second heat sink and the third component group on the third heat sink.

[0014] In some embodiments, the power module further includes a first heat sink, a second heat sink, a third heat sink, two first component groups, two second component groups, and two third component groups. A first component group and a second component group are respectively provided on opposite sides of the first heat sink in the thickness direction, and the first component group and the second component group on the first heat sink are connected to the first busbar. Another first component group and another second component group are respectively provided on opposite sides of the second heat sink in the thickness direction, and the first component group and the second component group on the second heat sink are connected to the second busbar. Two third component groups are respectively provided on opposite sides of the third heat sink in the thickness direction, one third component group is electrically connected to the first component group and the second component group on the first heat sink, and the other third component group is electrically connected to the first component group and the second component group on the second heat sink.

[0015] In some embodiments, the first heat dissipation plate is arranged perpendicular to the first busbar.

[0016] In some embodiments, the second heat dissipation plate is arranged perpendicular to the second busbar.

[0017] In some embodiments, the first heat dissipation plate and the third heat dissipation plate have an included angle β1, and the included angle β1 satisfies: 130°≤β1≤170°.

[0018] In some embodiments, the second heat dissipation plate and the third heat dissipation plate have an included angle β2, and the included angle β2 satisfies: 130°≤β2≤170°.

[0019] In some embodiments, the power module further comprises a first busbar and a second busbar, the first busbar having a first bend portion and a second bend portion connected thereto, and the second busbar having a third bend portion and a fourth bend portion connected thereto. The first bend portion is parallel to the first heat sink and is connected to the first component group on the first heat sink. The second bend portion is bent away from the first heat sink, parallel to the first busbar and connected thereto. The third bend portion is parallel to the first heat sink and is connected to the second component group on the first heat sink. The fourth bend portion is bent away from the first heat sink, parallel to the first busbar and connected thereto.

[0020] In some embodiments, the power module further comprises a third busbar and a fourth busbar, wherein the third busbar has a fifth bend and a sixth bend connected thereto, and the fourth busbar has a seventh bend and an eighth bend connected thereto. The fifth bend is parallel to the second heat sink and is connected to the first component group on the second heat sink. The sixth bend is bent away from the second heat sink, parallel to the second busbar, and connected thereto. The seventh bend is parallel to the second heat sink and is connected to the second component group on the second heat sink. The eighth bend is bent away from the second heat sink, parallel to the second busbar, and connected thereto.

[0021] In some embodiments, the multiple capacitors on the first busbar are divided into three rows of capacitors, and the three rows of capacitors are spaced apart to form two connecting portions on the first busbar that are not occupied by the multiple capacitors. The orthographic projection of the second bend on the first busbar at least partially overlaps with one of the connecting portions, and the fastener passes through the second bend and one of the connecting portions to connect the two together. The orthographic projection of the fourth bend on the first busbar at least partially overlaps with another connecting portion, and the fastener passes through the fourth bend and the other connecting portion to connect the two together.

[0022] In some embodiments, the plurality of capacitors on the second busbar are divided into three rows of capacitors, which are spaced apart to form two connection portions on the second busbar that are not occupied by the plurality of capacitors. The orthographic projection of the sixth bend on the second busbar at least partially overlaps with one of the connection portions, and the fastener passes through the sixth bend and one of the connection portions to connect the two together. The orthographic projection of the eighth bend on the second busbar at least partially overlaps with another connection portion, and the fastener passes through the eighth bend and the other connection portion to connect the two together.

[0023] In some embodiments, two first device groups are connected to the positive terminal and the neutral terminal of the busbar assembly, two second device groups are connected to the negative terminal and the neutral terminal of the busbar assembly, and two third device groups are connected to the same phase of the three AC phases.

[0024] In some embodiments, the two first device groups, the two second device groups, and the two third device groups are all IGBT device groups, and each IGBT device group includes a plurality of IGBT devices connected in parallel.

[0025] In another aspect, the present invention further provides a power conversion device comprising a cabinet and a DC fuse, a DC disconnect switch, the power module provided in the aforementioned aspects, a reactor, an AC filter capacitor, and an AC circuit breaker housed therein and electrically connected in sequence.

[0026] According to the busbar assembly, power module, and power conversion device provided by the embodiments of the present invention, since the busbar assembly includes a first busbar and a second busbar that are electrically connected and arranged at an angle, the first busbar and the second busbar can each have a suitable angle relative to the first heat sink and the second heat sink. This helps ensure that, for either the first heat sink or the second heat sink, the line from the first component group on the first heat sink to the busbar assembly and the line from the second component group on the second heat sink to the busbar assembly are both short, and the difference in length between the two lines is small. Shorter lines and a smaller difference in line length help reduce stray inductance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic structural diagram of a power module according to an embodiment of the present invention.

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the power module from another perspective.

[0029] Figure 3 for Figure 1 Schematic diagram of the structure of the power module from another perspective.

[0030] Figure 4 for Figure 1 Schematic diagram of the structure of the two busbars of the busbar assembly of the power module.

[0031] Figure 5 for Figure 1 Schematic diagram of the structure of a phase unit of the power module.

[0032] Figure 6 for Figure 1 Schematic diagram of the structure of multiple phase units and multiple heat sinks of a power module.

[0033] Figure 7 for Figure 4 Schematic diagram of the exploded structure of the two busbars in the busbar assembly.

[0034] Figure 8 For the Figure 3Schematic cross-sectional view taken along line AA.

[0035] Figure 9 for Figure 4 Schematic diagram of the exploded structure of a busbar in the busbar assembly.

[0036] Figure 10 for Figure 2 Exploded diagram of part of the power module.

[0037] Figure 11 for Figure 2 Schematic diagram of another part of the power module.

[0038] Figure 12 FIG. 1 is a schematic structural diagram of a power module according to another embodiment of the present invention.

[0039] Figure 13 for Figure 12 Schematic diagram of the structure of multiple phase units and multiple heat sinks of a power module.

[0040] Figure 14 FIG. 1 is a structural diagram of a power conversion device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described in the specification and illustrated in the accompanying drawings. It is understood that the embodiments described and illustrated herein are non-limiting examples, and thus it is recognized that the specific structural and functional details disclosed herein are representative and exemplary. Modifications and changes may be made to these embodiments without departing from the scope of the claims.

[0042] One embodiment of the present invention provides a power module 10. To facilitate understanding, the overall structure of the power module 10 is described below. It should be understood that the structure of the power module 10 is not limited to the following description. For example, one or more of the elements (components or parts) described below may be omitted or replaced, and their layout relationships may be altered.

[0043] refer to Figures 1 to 5 The power module 10 may include a busbar assembly 11, which may include two busbars 111 and a plurality of capacitors 12. The power module 10 may also include a plurality of phase units 13, a plurality of AC terminals 14, a plurality of line buses 15, a plurality of gate plates 16, and a plurality of heat sinks 17.

[0044] Busbar 111 can provide multiple DC terminals, namely a positive terminal, a negative terminal, and a neutral terminal, which can be referred to as the P terminal, N terminal, and O terminal, respectively. The positive terminal can be electrically connected to the positive terminal of a DC power source or DC load in the energy storage system. The negative terminal can be electrically connected to the negative terminal of a DC power source or DC load. The neutral terminal can be connected to the neutral point in the energy storage system, that is, the neutral terminal can be grounded.

[0045] Each busbar 111 can be electrically connected to at least one capacitor 12. For example, multiple capacitors 12 can help maintain voltage stability when operating current fluctuates, reducing the impact of current on voltage and preventing faults such as overvoltage or undervoltage. In another example, multiple capacitors 12 can filter out noise and interference signals, smoothing the current and improving operational stability and performance.

[0046] Each phase unit 13 may include a first device assembly 131, a second device group 132, and a third device group 133. The first device assembly 131 may be electrically connected to the positive and neutral terminals of the busbar assembly 13 via a busbar 15, and the second device group 132 may be electrically connected to the negative and neutral terminals of the busbar assembly 11 via a busbar 15. The first and second device groups 131, 132 may be electrically connected to the third device group 133 via two busbars 15, respectively. The third device group 133 may be electrically connected to an AC terminal 14. Through the AC terminal 14, the phase unit 13 may be electrically connected to one of the three AC phases of the AC power source or AC load in the energy storage system.

[0047] like Figure 5 As shown, each device group in the first device assembly 131, the second device group 132, and the third device group 133 may include multiple devices 130 connected in parallel, and the multiple devices 130 may be arranged along the direction indicated by the arrows X+ / X- in the figure. As an example, the device 130 may be an IGBT device. It will be understood that the IGBT device mentioned herein may be the same as the previous IGBT device. For the purpose of brevity, the structure and working principle of the IGBT device will not be described in detail herein. It will be understood that although each device group includes four devices 130 in the figure, in other embodiments of the present invention, each device group may include other numbers of devices 130. For example, in some examples, each device group may include two, three, five, or more devices 130.

[0048] In some examples, the power module 10 may include six phase units, divided into three pairs. Figure 6As shown, the first device assembly 131a, the second device group 132a, and the third device group 133a constitute a phase unit; the first device assembly 131b, the second device group 132b, and the third device group 133b constitute a phase unit; these two phase units constitute a pair of phase units, hereinafter referred to as the first pair of phase units. The first device assembly 131c, the second device group 132c, and the third device group 133c constitute a phase unit; the first device assembly 131d, the second device group 132d, and the third device group 133d constitute a phase unit; these two phase units constitute a pair of phase units, hereinafter referred to as the second pair of phase units. The first device assembly 131e, the second device group 132e, and the third device group 133e constitute a phase unit; the first device assembly 131f, the second device group 132f, and the third device group 133f constitute a phase unit; these two phase units constitute a pair of phase units, hereinafter referred to as the third pair of phase units.

[0049] The three pairs of phase units are electrically connected to the three AC phases of the AC power source or AC load in the energy storage system. For example, the first pair of phase units can be electrically connected to the U phase of the AC power source or AC load via AC terminals 14a and 14b, respectively; the second pair of phase units can be electrically connected to the V phase of the AC power source or AC load via AC terminals 14c and 14d, respectively; and the third pair of phase units can be electrically connected to the W phase of the AC power source or AC load via AC terminals 14e and 14f, respectively.

[0050] Gate plate 16 can also be called a driver plate. Each device group in first device assembly 131, second device group 132, and third device group 133 can be controlled by a corresponding gate plate 16. During operation of power module 10, gate plate 16 converts control signals into drive signals. The drive signals act on the gates of the device groups to control the on and off of the device groups, thereby achieving power conversion from DC to AC or vice versa.

[0051] During operation, the phase unit 13 generates heat. To prevent overheating, the phase unit 13 is mounted on a heat sink 17. As a non-limiting example, the heat sink 17 can be implemented as a liquid cooling plate, which may have flow paths for coolant to flow through, thereby removing heat through the flowing coolant. Of course, other types of heat sinks 17 are also contemplated, such as air-cooled heat sinks with fins or gas-liquid phase change heat sinks.

[0052] The power module 10 may include three heat sinks 17, namely a first heat sink 17a, a second heat sink 17b, and a third heat sink 17c. The length directions of the three heat sinks 17 may be consistent, and their length directions are indicated by arrows X+ / X- in the figure. The first pair of phase units, the second pair of phase units, and the third pair of phase units mentioned above may be arranged in sequence along the length direction of the heat sink 17. The following will take the first pair of phase units as an example to illustrate the arrangement of each pair of phase units on the three heat sinks 17. The arrangement of the other two pairs of phase units is the same as that of the first pair of phase units and will not be repeated in this article.

[0053] like Figure 6 As shown, the first device group 131a and the second device group 132a can be respectively installed on opposite sides of the first heat dissipation plate 17a in the thickness direction, the first device group 131b and the second device group 132b can be respectively installed on opposite sides of the second heat dissipation plate 17b in the thickness direction, and the two third device groups 133a and 133b can be respectively installed on opposite sides of the third heat dissipation plate 17c.

[0054] like Figure 2 As shown, in the thickness direction of the third heat sink 17c, that is, the direction indicated by the arrows Y+ / Y- in the figure, the first heat sink 17a and the second heat sink 17b are respectively located on opposite sides of the third heat sink 17c. In the width direction of the third heat sink 17c, that is, the direction indicated by the arrows Z+ / Z- in the figure, the first heat sink 17a and the second heat sink 17b are located on the same side of the third heat sink 17c. The first heat sink 17a and the second heat sink 17b can be arranged at an angle so that the distance between them gradually increases as they move away from the third heat sink 17c. In this arrangement, Figure 2 When viewed from the perspective of FIG, the three heat dissipation plates 17 are roughly Y-shaped.

[0055] The benefit of this arrangement is that it helps shorten the lines from the first and second device groups 131, 132 to the corresponding third device group 133 on each heat sink 17, and ensures that the difference in line length between the first and second device groups 131, 132 and the corresponding third device group 133 is small. Shorter lines and smaller line length differences help reduce stray inductance. However, Figure 2 As can be seen from the figure, this arrangement requires that the first heat dissipation plate 17a and the second heat dissipation plate 17b be arranged at an angle.

[0056] Previous power modules typically used a single, flat busbar. Because the first heat sink 17a and the second heat sink 17b are at an angle, using a conventional flat busbar would prevent both the first and second heat sinks 17a, 17b from simultaneously maintaining an appropriate angle relative to the busbar. If a heat sink 17 is positioned at an inappropriate angle relative to the busbar, the line lengths from the first and second component groups 131, 132 on that heat sink 17 to the busbar will be long, resulting in a significant difference in line lengths and increased stray inductance.

[0057] In view of this, the power module 10 provided in the embodiment of the present invention adopts a busbar assembly 11 with an improved structure. Figures 1 to 4 and Figure 7 As shown, the busbar assembly 11 may include two busbars 111, namely a first busbar 111a and a second busbar 111b. The first busbar 111a and the second busbar 111b are electrically connected, and the first busbar 111a and the second busbar 111b are arranged at an angle. In addition, each busbar 111 in the first busbar 111a and the second busbar 111b carries multiple capacitors 12 and is electrically connected to multiple device groups.

[0058] For example, the first busbar 111a can carry multiple capacitors 12a, be electrically connected to the first device component 131 on the first heat sink 17a through the first busbar 15a, and be electrically connected to the second device component 132 on the first heat sink 17a through the second busbar 15b; the second busbar 111b can carry multiple capacitors 12b, be electrically connected to the first device component 131 on the second heat sink 17b through the third busbar 15c, and be electrically connected to the second device component 132 on the second heat sink 17b through the fourth busbar 15d.

[0059] The busbar assembly 11 includes a first busbar 111a and a second busbar 111b that are electrically connected and arranged at an angle. The first busbar 111a and the second busbar 111b can each have a suitable angle relative to the first heat sink 17a and the second heat sink 17b. This helps ensure that, for either the first heat sink 17a or the second heat sink 17b, the line from the first component group 131 thereon to the busbar assembly 11 and the line from the second component group 132 thereon to the busbar assembly 11 are both short, with the difference in length between the two lines being small. Shorter lines and a smaller difference in line length help reduce stray inductance. Furthermore, in the width direction of the third heat sink 17c, the angled arrangement of the first busbar 111a and the second busbar 111b reduces the width, thereby reducing the volume, compared to the first busbar 111a and the second busbar 111b that were previously arranged on the same horizontal plane.

[0060] There are many ways to electrically connect the first busbar 111a and the second busbar 111b, and the embodiments of the present invention do not impose any particular restrictions on this. For example, the first busbar 111a and the second busbar 111b can be formed by bending a whole plate into one piece, which can reduce the impedance between the first busbar 111a and the second busbar 111b. For another example, the first busbar 111a and the second busbar 111b can be two independent plates directly connected together, which can reduce the cost of the molding mold. For another example, the first busbar 111a and the second busbar 111b can be electrically connected through an intermediate piece, such as a copper busbar, which can further simplify the structure.

[0061] As an exemplary implementation, refer to Figure 3 and Figure 7 The edge of the first busbar 111a near the second busbar 111b may be provided with a lug portion 112 protruding toward the second busbar 111b, and the edge of the second busbar 111b near the first busbar 111a may also be provided with a lug portion 112 protruding toward the first busbar 111a. The lug portion 112 of the first busbar 111a is connected to the lug portion 112 of the second busbar 111b to achieve electrical and physical connection between the first busbar 111a and the second busbar 111b.

[0062] There are various ways to connect the two lugs 112 of the first busbar 111a and the second busbar 111b, which are not particularly limited in the present embodiment. For example, the two lugs 112 can be connected together using fasteners. In another example, the two lugs 112 can be connected together by welding, locking, riveting, plugging, or bonding.

[0063] As an exemplary implementation, refer to Figure 3 、 Figure 7 and Figure 8 The two lugs 112 of the first busbar 111a and the second busbar 111b can be stacked, that is, one lug 112 can be placed on top of another lug 112. The busbar assembly 11 can also include a fastener 113 that passes through the two lugs 112 to fasten and connect them together. This arrangement offers advantages such as reliable connection, simple structure, and easy assembly and disassembly.

[0064] By way of example only, the two lugs 112 of the first busbar 111a and the second busbar 111b can be fastened by two fasteners 113 (i.e., a bolt and a nut). The two fasteners 113 can be spaced apart along the X+ / X- directions. It is understood that in other examples, the two lugs 112 can be fastened by only one fastener 113 (e.g., a rivet stud), or the two lugs 112 can be fastened by three or more fasteners 113.

[0065] like Figure 9 As shown, each busbar 111 may include a plurality of plates 114 arranged in a stacked manner, namely, a positive plate 114a, a negative plate 114b, and a neutral plate 114c. For example, the neutral plate 114c may be located between the positive plate 114a and the negative plate 114b. The positive plate 114a may be used to provide a positive terminal, the negative plate 114b may be used to provide a negative terminal, and the neutral plate 114c may be used to provide a neutral terminal. In certain embodiments, each busbar 111 may further include two insulating layers 115, one of which is located between the neutral plate 114c and the negative plate 114b, and the other is located between the positive plate 114a and the neutral plate 114c.

[0066] Continue to refer Figure 3 、 Figure 7 and Figure 8 Each busbar 111 may be provided with a plurality of lug portions 112, which may include a positive lug portion 112a and a negative lug portion 112b. The positive lug portion 112a may be provided by the positive electrode plate 114a, that is, the positive lug portion 112a may be a part of the positive electrode plate 114a, or may be connected to the positive electrode plate 114a. The negative lug portion 112b may be provided by the negative electrode plate 114b, that is, the negative lug portion 112b may be a part of the negative electrode plate 114b, or may be connected to the negative electrode plate 114b. The positive lug portion 112a of the first busbar 111a is connected to the positive lug portion 112a of the second busbar 111b, and the negative lug portion 112b of the first busbar 111a is connected to the negative lug portion 112b of the second busbar 111b. In this way, the positive plates 114 a and the negative plates 114 b of the two busbars 111 can be electrically connected, and at the same time, the two busbars 111 can be physically connected together.

[0067] Further, continue to refer to Figure 3 、 Figure 7 and Figure 8 Each busbar 111 can have multiple positive tabs 112a and multiple negative tabs 112b, which can be arranged alternately. This improves the physical connection strength between the two busbars 111 and ensures more balanced current distribution. Furthermore, any adjacent positive tabs 112a and negative tabs 112b can be spaced apart to ensure insulation between the positive and negative plates 114a and 114b.

[0068] In the current embodiment, each busbar 111 is electrically connected to a set of three-phase units (U, V, and W). This means that if the neutral plates 114c of two busbars 111 are electrically connected, phase units connected to different busbars 111 may interfere with each other. In view of this, in a non-limiting example, the neutral plate 114c of the first busbar 111a and the neutral plate 114c of the second busbar 111b can be spaced apart so that the neutral plates 114c of the two busbars 111 are not electrically connected, thereby preventing phase units connected to different busbars 111 from interfering with each other.

[0069] It should be noted that in other embodiments of the present invention, the neutral plates 114c of the two busbars 111 can also be electrically connected. For example, in the power module 10a described below, the two busbars 111 are electrically connected to a set of three-phase units (U, V, and W). In this case, interference between the phase units will not occur. Therefore, in the power module 10a described below, the neutral plates 114c of the two busbars 111 can be connected together to improve the overall structural strength of the busbar assembly 11 and reduce the impedance between the two busbars 111.

[0070] Back to Figure 2 The first heat sink 17a can be arranged perpendicular to the first busbar 111a. This helps shorten the path from the first and second component groups 131 and 132 on the first heat sink 17a to the first busbar 111a and reduces the length difference between the two paths, thereby reducing stray inductance. Similarly, the second heat sink 17b can be arranged perpendicular to the second busbar 111b to shorten the path from the first and second component groups 131 and 132 on the second heat sink 17a to the second busbar 111bb and reduce the length difference between the two paths, thereby reducing stray inductance.

[0071] It should be noted that the terms "parallel" and "perpendicular" mentioned herein should be understood as "substantially parallel" and "substantially perpendicular," respectively, and a reasonable error range should be included. For example, the error range may be ±10°.

[0072] Continue to refer Figure 2 The first busbar plate 111a and the second busbar plate 111b may form an angle α, the first heat dissipation plate 17a and the third heat dissipation plate 17c may form an angle β1, and the second heat dissipation plate 17b and the third heat dissipation plate 17c may form an angle β2.

[0073] The included angle β1 may satisfy 130°≤β1≤170°.

[0074] If the angle β1 is too large or too small, the path from the first and second component groups 131 and 132 on the first heat sink 17a to the third component group 133 on the third heat sink 17c will be long, and the difference between the two paths will be large, which will increase the stray inductance. Setting the angle β1 within the above range helps to shorten the two paths and minimize the difference, thereby reducing stray inductance.

[0075] Preferably, the angle β1 may satisfy 140°≤β1≤160°.

[0076] In this way, the lengths of the two lines can be made closer to each other, thereby further reducing the stray inductance.

[0077] More preferably, the angle β1 may satisfy β1=150°.

[0078] In this way, the lengths of the two lines can be made closer to each other, thereby further reducing the stray inductance.

[0079] Alternatively, the angle β1 may be any value among 135°, 145°, 155°, and 165°.

[0080] The angle β2 may satisfy 130°≤β2≤170°.

[0081] If the angle β2 is too large or too small, the path from the first and second component groups 131 and 132 on the second heat sink 17a to the third component group 133 on the third heat sink 17c will be long, and the difference between the two paths will be large, which will increase the stray inductance. Setting the angle β2 within the above range helps to shorten the two paths and minimize the difference, thereby reducing stray inductance.

[0082] Preferably, the angle β2 may satisfy 140°≤β2≤160°.

[0083] In this way, the lengths of the two lines can be made closer to each other, thereby further reducing the stray inductance.

[0084] More preferably, the angle β2 may satisfy β2=150°.

[0085] In this way, the lengths of the two lines can be made closer to each other, thereby further reducing the stray inductance.

[0086] Alternatively, the angle β2 may be any value among 135°, 145°, 155°, and 165°.

[0087] The included angle α may satisfy 80°≤α≤160°.

[0088] Accordingly, for the first heat sink 17a and the second heat sink 17b arranged at an angle, the first busbar 111a and the second busbar 111b will be able to have a relatively suitable angle with the first heat sink 17a and the second heat sink 17b respectively, thereby helping to reduce stray inductance.

[0089] Preferably, the angle α may satisfy 100°≤α≤140°.

[0090] Reducing angle α within a certain range helps reduce the size of the busbar assembly 11 in the Y+ / Y- direction. In this case, the size of the busbar assembly 11 in the Y+ / Y- direction is limited by the two wire buses 111. If angle α is too small, the size of the busbar assembly 11 in the Y+ / Y- direction will be limited by the capacitor 12. In this case, further reducing angle α will increase the overall size of the busbar assembly 11. When angle α satisfies 100°≤α≤140°, not only can the first busbar 111a and the second busbar 111b respectively have a more appropriate angle with the first heat sink 17a and the second heat sink 17b, but the size of the busbar assembly 11 in the Y+ / Y- direction will also be smaller.

[0091] More preferably, the angle α may satisfy α=120°.

[0092] When α = 120°, combined with β1 = 150° and β2 = 150°, the first busbar 111a and the second busbar 111b are arranged perpendicular to the first heat sink 17a. In this arrangement, the distances between the first and second component groups 131 and 132 and the busbar assembly 111 are short, and the length difference is small. Furthermore, the distances between the first and second component groups 131 and 132 and the third component group 133 are also short, and the length difference is small. This helps the power module 10 achieve lower stray inductance and more balanced current distribution.

[0093] Alternatively, the angle α may be any value among 85°, 90°, 95°, 105°, 110°, 115°, 125°, 130°, 135°, 150°, and 155°.

[0094] refer to Figure 2 and Figure 10The first busbar 15a may have a first bend 151 and a second bend 152 connected to each other, and the second busbar 15b may have a third bend 153 and a fourth bend 154 connected to each other. The first bend 151 may be parallel to the first heat sink 17a and connected to the first component group 131 on the first heat sink 17a. The second bend 152 may be bent toward a side away from the first heat sink 17a, parallel to the first busbar 111a and connected to the first busbar 111a. The third bend 153 may be parallel to the first heat sink 171a and connected to the second component group 132 on the first heat sink 17a. The fourth bend 154 may be bent toward a side away from the first heat sink 17a, parallel to the first busbar 111a and connected to the first busbar 111a.

[0095] This reduces the number of bends in the first and second busbars 15a, 15b. The paths from the first and second component groups 131, 132 on the first heat sink 17a to the first busbar 111a are shorter, and the difference between the two paths is smaller, resulting in lower stray inductance. Furthermore, with this configuration, the first heat sink 17a does not obstruct the second and fourth bends 152, 154, making it easier to connect the second and fourth bends 152, 154 to the first busbar 111a, for example, using fasteners.

[0096] Continue to refer Figure 2 and Figure 10 , the multiple capacitors 12 on the first busbar 111a can be divided into three rows of capacitors 12, each row of capacitors 12 is arranged along the X+ / X- direction, and the three rows of capacitors 12 are arranged at intervals. Between any two adjacent rows of capacitors 12, the first busbar 111a has a connection portion that is not occupied by the capacitors 12. The three rows of capacitors 12 can form two connection portions 116 and 117. The orthographic projection of the second bend portion 152 on the first busbar 111a can at least partially overlap with the connection portion 116, and a fastener (not shown in the figure) can pass through the second bend portion 152 and the connection portion 116 to connect the two together. The orthographic projection of the fourth bend portion 154 on the first busbar 111a can at least partially overlap with the connection portion 117, and a fastener (not shown in the figure) can pass through the fourth bend portion 154 and the connection portion 117 to connect the two together. According to this configuration, the first busbar 15a and the second busbar 15b are connected to the first busbar 111a without the aid of connecting copper pillars, which helps shorten the lines from the first and second component groups 131 and 132 on the first heat sink 17a to the first busbar 111a, thereby reducing stray inductance.

[0097] refer to Figure 2 and Figure 11The third busbar 15c may have a fifth bend 155 and a sixth bend 156 connected to each other, and the fourth busbar 15d may have a seventh bend 157 and an eighth bend 158 connected to each other. The fifth bend 155 may be parallel to the second heat sink 17b and connected to the first component group 131 on the second heat sink 17b. The sixth bend 156 may be bent away from the second heat sink 17b, parallel to the second busbar 111b and connected to the second busbar 111b. The seventh bend 157 is parallel to the second heat sink 17b and connected to the second component group 132 on the second heat sink 17b. The eighth bend 158 is bent away from the second heat sink 17b, parallel to the second busbar 111b and connected to the second busbar 111b.

[0098] This reduces the number of bends in the third and fourth busbars 15c and 15d, shortening the paths from the first and second component groups 131 and 132 on the second heat sink 17b to the second busbar 111b. The difference between the paths is also small, resulting in lower stray inductance. Furthermore, this configuration prevents the second heat sink 17b from obstructing the sixth and eighth bends 156 and 158, making it easier to connect the sixth and eighth bends 156 and 158 to the second busbar 111b, for example, using fasteners.

[0099] Continue to refer Figure 2 and Figure 11 , the multiple capacitors 12 on the second busbar 111b can be divided into three rows of capacitors 12, each row of capacitors 12 is arranged along the X+ / X- direction, and the three rows of capacitors 12 are arranged at intervals. Between any two adjacent rows of capacitors 12, the second busbar 111b has a connection portion that is not occupied by the capacitors 12. The three rows of capacitors 12 can form two connection portions 118 and 119. The orthographic projection of the sixth bend 156 on the second busbar 111b can at least partially overlap with the connection portion 118, and a fastener (not shown in the figure) can pass through the sixth bend 156 and the connection portion 118 to connect the two together. The orthographic projection of the eighth bend 158 on the second busbar 111b can at least partially overlap with the connection portion 119, and a fastener (not shown in the figure) can pass through the eighth bend 158 and the connection portion 119 to connect the two together. According to this configuration, the third bus 15a and the fourth bus 15d are connected to the second busbar 111b without the aid of connecting copper pillars, which helps shorten the lines from the first and second device groups 131 and 132 on the second heat sink 17b to the second busbar 111b, thereby reducing stray inductance.

[0100] Another embodiment of the present invention provides a power module 10a. The power module 10a described below has many of the same elements as the power module 10 described above. For the sake of simplicity, these same elements will be referred to using the same reference numerals throughout the text to avoid repeated descriptions.

[0101] refer to Figure 12 and Figure 13 Unlike the power module 10 in the aforementioned embodiment which includes six phase units 13, the power module 10a provided in the current embodiment may include only three phase units 13, namely, a first phase unit consisting of a first device group 131a, a second device group 132a, and a third device group 133a, a first phase unit consisting of a first device group 131b, a second device group 132b, and a third device group 133b, and a first phase unit consisting of a first device group 131c, a second device group 132c, and a third device group 133c.

[0102] Each heat sink 17 may be provided with a device group on only one side.

[0103] Specifically, a first component group 131 may be provided on one side of the first heat sink 17a in the thickness direction. The first component group 131 may be connected to the first busbar 111a, for example, via the first busbar 15a. A second component group 132 may be provided on one side of the second heat sink 17b in the thickness direction. The second component group 132 may be connected to the second busbar 111b, for example, via the second busbar 15b. A third component group 133 may be provided on one side of the third heat sink 17c in the thickness direction. The first component group 131 on the first heat sink 17a, the second component group 132 on the second heat sink 17b, and the third component group 133 on the third heat sink 17c may be electrically connected, for example, via two busbars 15, respectively.

[0104] The present invention also provides a power conversion device 100. Figure 14 As shown, the power conversion device 100 may include a cabinet 20 and a DC fuse 30, a DC disconnect switch 40, the power module 10 provided in the aforementioned aspects, a reactor 50, an AC filter capacitor 60 and an AC circuit breaker 70 housed in the cabinet 20 and electrically connected in sequence.

[0105] In particular, as shown in Figure Figure 14 As shown, the power conversion device 100 may include two reactors 50, one reactor 50 may be electrically connected to the AC terminals 14a, 14c, and 14e of three phase units, and the other reactor 50 may be electrically connected to the AC terminals 14b, 14d, and 14f of the other three phase units.

[0106] It should be understood that the term "including" and its variations used in the embodiments of the present invention are open-ended, i.e., "including but not limited to." The term "according to" means "at least in part according to." The term "one embodiment" means "at least one embodiment," and the term "another embodiment" means "at least another embodiment."

[0107] It should be understood that although the terms "first" or "second" etc. may be used in embodiments of the present invention to describe various elements, for example, a first busbar and a second busbar, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0108] The scope of protection of the present invention is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A busbar assembly, characterized in that: The busbar assembly includes a first busbar, a second busbar and a capacitor, and the first busbar and the second busbar are both electrically connected to at least one of the capacitors; The first busbar is electrically connected to the second busbar, and the first busbar is arranged at an angle to the second busbar.

2. The busbar assembly according to claim 1, characterized in that: A lug portion is formed on one side edge of the first busbar toward the second busbar, and a lug portion is also formed on one side edge of the second busbar toward the first busbar. The lug portion of the first busbar is connected to the lug portion of the second busbar.

3. The busbar assembly according to claim 2, characterized in that: The lug portion of the first busbar and the lug portion of the second busbar are arranged in a stacked manner; The busbar assembly further includes a fastener passing through the lug portion of the first busbar and the lug portion of the second busbar to connect the two.

4. The busbar assembly according to claim 2, characterized in that: Each busbar includes a positive electrode plate and a negative electrode plate arranged in a stacked manner. Each busbar is provided with a plurality of lug portions, wherein the plurality of lug portions include a positive lug portion provided by the positive electrode plate and a negative lug portion provided by the negative electrode plate. The positive lug portion of the first busbar is connected to the positive lug portion of the second busbar, and the negative lug portion of the first busbar is connected to the negative lug portion of the second busbar.

5. The busbar assembly according to claim 4, characterized in that: Each busbar has a plurality of positive lug portions and a plurality of negative lug portions, the plurality of positive lug portions and the plurality of negative lug portions are alternately arranged, and any adjacent positive lug portions and negative lug portions are spaced apart.

6. The busbar assembly according to claim 4, characterized in that: Each busbar further includes a neutral plate stacked with the positive plate and the negative plate. The neutral plate of the first busbar is spaced apart from or electrically connected to the neutral plate of the second busbar.

7. The busbar assembly according to any one of claims 1 to 6, characterized in that: The first busbar and the second busbar have an included angle α, and the included angle α satisfies: 80°≤α≤160°.

8. A power module, characterized in that: Comprising the busbar assembly according to any one of claims 1 to 7.

9. The power module according to claim 8, characterized in that: Also includes a first heat dissipation plate, a second heat dissipation plate, a third heat dissipation plate, a first device group, a second device group, and a third device group; A first component group is provided on one side of the first heat sink in the thickness direction, and the first component group on the first heat sink is connected to the first busbar; A second component group is provided on one side of the second heat sink in the thickness direction, and the second component group on the second heat sink is connected to the second busbar; A third component group is provided on one side of the third heat dissipation plate in the thickness direction. The first component group on the first heat dissipation plate is electrically connected to the second component group on the second heat dissipation plate and the third component group on the third heat dissipation plate.

10. The power module according to claim 8, characterized in that: Also includes a first heat dissipation plate, a second heat dissipation plate, a third heat dissipation plate, two first device groups, two second device groups, and two third device groups; A first component group and a second component group are respectively provided on opposite sides of the first heat sink in the thickness direction, and the first component group and the second component group on the first heat sink are connected to the first busbar; Another first component group and another second component group are respectively provided on opposite sides of the second heat sink in the thickness direction, and the first component group and the second component group on the second heat sink are connected to the second busbar; The two third device groups are respectively provided on opposite sides of the third heat sink in the thickness direction, one third device group is electrically connected to the first device group and the second device group on the first heat sink, and the other third device group is electrically connected to the first device group and the second device group on the second heat sink.

11. The power module according to claim 10, characterized in that: The first heat dissipation plate is arranged perpendicularly to the first busbar; and / or the second heat dissipation plate is arranged perpendicularly to the second busbar.

12. The power module according to claim 11, characterized in that: The first heat dissipation plate and the third heat dissipation plate have an included angle β1, and the included angle β1 satisfies: 130°≤β1≤170°; and / or the second heat dissipation plate and the third heat dissipation plate have an included angle β2, and the included angle β2 satisfies: 130°≤β2≤170°.

13. The power module according to claim 10, wherein: Also includes a first busbar and a second busbar, the first busbar having a first bend portion and a second bend portion connected to each other, the second busbar having a third bend portion and a fourth bend portion connected to each other; the first bend portion is parallel to the first heat sink and is connected to the first component group on the first heat sink; the second bend portion is bent toward a side away from the first heat sink, parallel to the first busbar and connected to the first busbar; the third bend portion is parallel to the first heat sink and is connected to the second component group on the first heat sink; the fourth bend portion is bent toward a side away from the first heat sink, parallel to the first busbar and connected to the first busbar; and / or, The system further includes a third busbar and a fourth busbar, wherein the third busbar has a fifth bend portion and a sixth bend portion connected thereto, and the fourth busbar has a seventh bend portion and an eighth bend portion connected thereto; the fifth bend portion is parallel to the second heat sink and is connected to the first component group on the second heat sink; the sixth bend portion is bent toward a side away from the second heat sink, is parallel to the second busbar and is connected thereto; the seventh bend portion is parallel to the second heat sink and is connected to the second component group on the second heat sink; The eighth bent portion is bent toward a side away from the second heat dissipation plate, parallel to the second busbar and connected to the second busbar.

14. The power module according to claim 13, wherein: The multiple capacitors on the first busbar are divided into three rows of capacitors, and the three rows of capacitors are arranged at intervals to form two connection portions on the first busbar that are not occupied by the multiple capacitors; the orthographic projection of the second bent portion on the first busbar at least partially overlaps with one connection portion, and a fastener passes through the second bent portion and the one connection portion to connect the two together; the orthographic projection of the fourth bent portion on the first busbar at least partially overlaps with another connection portion, and a fastener passes through the fourth bent portion and the other connection portion to connect the two together; and / or The multiple capacitors on the second busbar are divided into three rows of capacitors, and the three rows of capacitors are arranged at intervals to form two connection portions on the second busbar that are not occupied by the multiple capacitors; the orthographic projection of the sixth bend on the second busbar at least partially overlaps with one connection portion, and a fastener passes through the sixth bend and the one connection portion to connect the two together; the orthographic projection of the eighth bend on the second busbar at least partially overlaps with another connection portion, and a fastener passes through the eighth bend and the other connection portion to connect the two together.

15. The power module according to claim 9 or 10, characterized in that: The first device group is connected to the positive terminal and the neutral terminal of the busbar assembly, the second device group is connected to the negative terminal and the neutral terminal of the busbar assembly, and the third device group is connected to the same phase of the three AC phases.

16. The power module according to claim 15, characterized in that: The first device group, the second device group, and the third device group are all IGBT device groups, and each IGBT device group includes a plurality of IGBT devices connected in parallel.

17. A power conversion device, characterized in that: The invention comprises a cabinet body and a DC fuse, a DC isolating switch, a power module, a reactor, an AC filter capacitor and an AC circuit breaker which are housed in the cabinet body and electrically connected in sequence. The power module is the power module according to any one of claims 8 to 16.

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