CN223230655U - Busbar assembly of power module, power module and power conversion device - Google Patents

Abstract

The embodiment of the utility model provides a busbar assembly of a power module, the power module with the busbar assembly and a power conversion device with the power module. The busbar assembly includes 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 is arranged at an included angle with the second busbar. Because the busbar assembly comprises a first busbar and a second busbar which are electrically connected and are arranged in an included angle mode, the first busbar and the second busbar can respectively have proper included angles relative to the first radiating plate and the second radiating plate. This helps ensure that for either the first heat spreader plate or the second heat spreader plate, the first device group on it and the second device group on it are both shorter in line to the busbar assembly and the difference in length between the two lines is smaller. Shorter lines and smaller line length differences help reduce stray inductance.

Description

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

Technical Field

The embodiment of the utility model relates to the technical field of power electronics, in particular to a busbar assembly of a power module, the power module with the busbar assembly and a power conversion device with the power module.

Background

The power conversion device can realize conversion of direct current and alternating current, and is popularized in electric energy application scenes such as power generation, power transmission, power utilization and the like. For example, the power conversion device may be applied to an electric vehicle, and functions between a battery system and a power grid/load.

The power module is the core of the power conversion apparatus and generally includes a busbar and a set of capacitors and devices electrically connected thereto. Stray inductances in the power module lines can affect current balance, which is detrimental to the operation performance of the power conversion device. Accordingly, there is a need in the related art for improvements to reduce stray inductance.

Disclosure of utility model

In view of the above, an embodiment of the present utility model provides 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 higher stray inductance in the power module circuit.

In one aspect, an embodiment of the present utility model provides a busbar assembly of a power module. The busbar assembly includes 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 is arranged at an included angle with the second busbar.

In some embodiments, the first busbar is formed with lug portions protruding toward one side edge of the second busbar, and the second busbar is also formed with lug portions protruding toward one side edge of the first busbar, and the lug portions of the first busbar are connected with the lug portions of the second busbar.

In some embodiments, the tab portions of the first busbar are arranged in a stacked relationship with the tab portions of the second busbar, and the busbar assembly further includes a fastener passing through the tab portions of the first busbar and the tab portions of the second busbar to connect the two.

In some embodiments, each busbar includes a stacked arrangement of positive and negative plates, each busbar being provided with a plurality of tab portions. The plurality of tab portions include a positive tab portion provided by the positive plate and a negative tab portion provided by the negative plate. The positive lug parts of the first busbar are connected with the positive lug parts of the second busbar, and the negative lug parts of the first busbar are connected with the negative lug parts of the second busbar.

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 being alternately arranged, and any adjacent positive tab portions and negative tab portions being spaced apart.

In some embodiments, each busbar further includes a neutral plate in stacked arrangement with the positive and negative plates, the neutral plates of the first busbar being spaced apart or electrically connected with the neutral plates of the second busbar.

In some embodiments, the first busbar and the second busbar have an included angle alpha, which satisfies 80 DEG≤alpha≤160 deg.

On the other hand, the embodiment of the utility model also provides a power module, which comprises the busbar assembly.

In some embodiments, the power module further includes a first heat spreader plate, a second heat spreader plate, a third heat spreader plate, a first device group, a second device group, and a third device group. One side of the first heat dissipation plate in the thickness direction is provided with a first device group, and the first device group on the first heat dissipation plate is connected with the first busbar. One side of the second heat radiation plate in the thickness direction is provided with a second device group, and the second device group on the second heat radiation plate is connected with a second busbar. One side of the third radiating plate in the thickness direction is provided with a third device group, and the first device group on the first radiating plate is electrically connected with the second device group on the second radiating plate and the third device group on the third radiating plate.

In some embodiments, the power module further includes a first heat spreader plate, a second heat spreader plate, a third heat spreader plate, two first device groups, two second device groups, and two third device groups. The opposite sides of the thickness direction of the first heat dissipation plate are respectively provided with a first device group and a second device group, and the first device group and the second device group on the first heat dissipation plate are connected with the first busbar. The opposite sides of the second heat dissipation plate in the thickness direction are respectively provided with another first device group and another second device group, and the first device group and the second device group on the second heat dissipation plate are connected with the second busbar. Two third device groups are respectively arranged on two opposite sides of the thickness direction of the third heat dissipation plate, one third device group is electrically connected with the first device group and the second device group on the first heat dissipation plate, and the other third device group is electrically connected with the first device group and the second device group on the second heat dissipation plate.

In some embodiments, the first heat dissipating plate is disposed perpendicular to the first busbar.

In some embodiments, the second heat dissipating plate is disposed perpendicular to the second busbar.

In some embodiments, the first heat sink and the third heat sink have an included angle β1, the included angle β1 satisfying 130+.β1+.170 °.

In some embodiments, the second heat sink and the third heat sink have an included angle β2, the included angle β2 satisfying 130+.β2+.170 °.

In some embodiments, the power module further includes a first wire row having a first bend and a second bend that meet, and a second wire row having a third bend and a fourth bend that meet. The first bending part is parallel to the first heat dissipation plate and is connected with the first device group on the first heat dissipation plate. The second bending part bends towards one side deviating from the first heat dissipation plate, is parallel to the first busbar and is connected with the first busbar. The third bending part is parallel to the first heat dissipation plate and is connected with the second device group on the first heat dissipation plate. The fourth bending part bends towards one side deviating from the first heat dissipation plate, is parallel to the first busbar and is connected with the first busbar.

In some embodiments, the power module further includes a third wire row having a fifth bend and a sixth bend connected together, and a fourth wire row having a seventh bend and an eighth bend connected together. The fifth bending part is parallel to the second heat dissipation plate and is connected with the first device group on the second heat dissipation plate. The sixth bending part bends towards one side deviating from the second heat radiation plate, is parallel to the second busbar and is connected with the second busbar. The seventh bending part is parallel to the second heat dissipation plate and is connected with the second device group on the second heat dissipation plate. The eighth bending part bends towards one side deviating from the second heat dissipation plate, is parallel to the second busbar and is connected with the second busbar.

In some embodiments, the plurality of capacitors on the first busbar are divided into three rows of capacitors, the three rows of capacitors being spaced apart to form two connections on the first busbar that are not occupied by the plurality of capacitors. The orthographic projection of the second bending part on the first busbar is at least partially overlapped with one connecting part, and a fastener passes through the second bending part and one connecting part to connect the second bending part and the connecting part together. The orthographic projection of the fourth bending part on the first busbar is at least partially overlapped with the other connecting part, and a fastener passes through the fourth bending part and the other connecting part to connect the fourth bending part and the other connecting part together.

In some embodiments, the plurality of capacitors on the second busbar are divided into three rows of capacitors, the three rows of capacitors being spaced apart to form two connections on the second busbar that are not occupied by the plurality of capacitors. The orthographic projection of the sixth bending part on the second busbar is at least partially overlapped with one connecting part, and a fastener passes through the sixth bending part and one connecting part to connect the sixth bending part and the connecting part together. The orthographic projection of the eighth bending part on the second busbar is at least partially overlapped with the other connecting part, and the fastener passes through the eighth bending part and the other connecting part to connect the eighth bending part and the other connecting part together.

In some embodiments, two first device groups are connected to the positive and neutral terminals of the busbar assembly, two second device groups are connected to the negative and neutral terminals of the busbar assembly, and two third device groups are connected to the same phase of the three alternating current phases.

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

On the other hand, the utility model further provides a power conversion device. The power conversion device comprises a cabinet body, a direct current fuse, a direct current isolating switch, a power module, a reactor, an alternating current filter capacitor and an alternating current breaker, wherein the direct current fuse, the direct current isolating switch, the power module, the reactor, the alternating current filter capacitor and the alternating current breaker are contained in the cabinet body and are electrically connected in sequence.

According to the busbar assembly, the power module and the power conversion device provided by the embodiment of the utility model, as the busbar assembly comprises the first busbar and the second busbar which are electrically connected and are arranged in an included angle, the first busbar and the second busbar can respectively have proper included angles relative to the first radiating plate and the second radiating plate. This helps ensure that for either the first heat spreader plate or the second heat spreader plate, the first device group on it and the second device group on it are both shorter in line to the busbar assembly and the difference in length between the two lines is smaller. Shorter lines and smaller line length differences help reduce stray inductance.

Drawings

Fig. 1 is a schematic structural diagram of a power module according to an embodiment of the utility model.

Fig. 2 is a schematic structural diagram of the power module of fig. 1 from another perspective.

Fig. 3 is a schematic structural view of the power module of fig. 1 from another perspective.

Fig. 4 is a schematic structural diagram of two busbar of the busbar assembly of the power module in fig. 1.

Fig. 5 is a schematic diagram of a phase unit of the power module in fig. 1.

Fig. 6 is a schematic diagram of a structure of a plurality of phase units and a plurality of heat dissipation plates of the power module of fig. 1.

Fig. 7 is an exploded view of two busbar of the busbar assembly of fig. 4.

Fig. 8 is a schematic cross-sectional view taken along line A-A in fig. 3.

Fig. 9 is an exploded view of one busbar of the busbar assembly of fig. 4.

Fig. 10 is an exploded schematic view of a portion of the power module of fig. 2.

Fig. 11 is an exploded view of another portion of the power module of fig. 2.

Fig. 12 is a schematic structural diagram of a power module according to another embodiment of the present utility model.

Fig. 13 is a schematic diagram of a structure of a plurality of phase units and a plurality of heat dissipation plates of the power module of fig. 12.

Fig. 14 is a schematic structural diagram of a power conversion device according to an embodiment of the present utility model.

Detailed Description

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 to be understood that the embodiments described and illustrated herein are non-limiting examples, so that it is recognized that the specific structural and functional details disclosed herein may be representative and exemplary. Modifications and changes may be made to these embodiments without departing from the scope of the claims.

An embodiment of the present utility model provides a power module 10. For ease of understanding, the overall construction of the power module 10 is first illustrated. It should be understood that the configuration of the power module 10 should not be limited to the following description. For example, some or some elements (members or portions) introduced below may be omitted or replaced, and the layout relationship between them may be replaced.

Referring to fig. 1 through 5, a power module 10 may include a busbar assembly 11 the busbar assembly 11 may include two busbars 111 and a plurality of capacitors 12. The power module 10 may further include a plurality of phase units 13, a plurality of ac terminals 14, a plurality of lines 15, a plurality of gate plates 16, and a plurality of heat dissipation plates 17.

The busbar 111 may provide a plurality of dc terminals, namely a positive terminal, a negative terminal and a neutral terminal, which may be referred to as a P-terminal, an N-terminal and an O-terminal, respectively. The positive terminal may be electrically connected to the positive electrode of a dc power source or a dc load in the energy storage system. The negative terminal may be electrically connected to the negative electrode of a direct current power supply or a direct current load. The neutral pole terminal may be connected to a neutral point in the energy storage system, i.e. the neutral pole terminal may be grounded.

Each busbar 111 may be electrically connected to at least one capacitor 12. For example, the plurality of capacitors 12 can help to maintain voltage stability when the operating current fluctuates, reduce the influence of current on voltage, and avoid faults such as overvoltage or undervoltage. For another example, the plurality of capacitors 12 can filter noise and interference signals, so as to smooth current and improve working stability and performance.

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

As shown in fig. 5, each of the first device group 131, the second device group 132, and the third device group 133 may include a plurality of devices 130 connected in parallel, and the plurality of devices 130 may be arranged in a direction indicated by an arrow x+/X-in the drawing. As one example, device 130 may be an IGBT device. It is to be understood that the IGBT devices mentioned herein may be the same as the previous IGBT devices, and for the sake of brevity, the construction and operation principle of the IGBT devices will not be described in detail herein. It will be appreciated that although four devices 130 are shown as being included in each device group, in other embodiments of the utility model, 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.

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

The three pairs of phase units are electrically connected to three alternating current phases of an alternating current power supply or an alternating current load in the energy storage system, respectively. For example, a first pair of phase units may be electrically connected to the U-phase of an ac power source or ac load through ac terminals 14a, 14b, respectively, a second pair of phase units may be electrically connected to the V-phase of the ac power source or ac load through ac terminals 14c, 14d, respectively, and a third pair of phase units may be electrically connected to the W-phase of the ac power source or ac load through ac terminals 14e, 14f, respectively.

The gate plate 16 may also be referred to as a drive plate. Each of the first device group 131, the second device group 132, and the third device group 133 may be controlled by a corresponding gate plate 16. In operation of the power module 10, the gate plate 16 converts the control signal into a drive signal that acts on the gates of the device group to control the on-off of the device group, thereby effecting a dc-to-ac or ac-to-dc power conversion.

In operation, the phase unit 13 generates heat. To avoid overheating, the phase unit 13 is mounted on a heat sink 17. As one non-limiting example, the air dispersion plate 17 may be implemented as a liquid cooling plate, in which a flow path through which the cooling liquid flows may be provided to take heat away by the flowing cooling liquid. Of course, other types of heat dissipation plates 17 are conceivable, such as an air-cooled heat dissipation plate or a gas-liquid phase heat dissipation plate with heat dissipation fins mounted.

The power module 10 may include three heat dissipation plates 17, namely, a first heat dissipation plate 17a, a second heat dissipation plate 17b, and a third heat dissipation plate 17c. The three heat-dissipating plates 17 may be uniform in length direction, and their length direction is indicated by arrow x+/X-in the figure. The aforementioned first, second, and third pairs of phase units may be sequentially arranged along the length direction of the heat dissipation plate 17. The arrangement of each pair of phase units on the three heat dissipation plates 17 will be exemplified below by taking the first pair of phase units as an example. The arrangement of the other two pairs of phase units is the same as that of the first pair of phase units, and the description thereof will not be repeated here.

As shown in fig. 6, the first device group 131a and the second device group 132a may be respectively mounted 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 may be respectively mounted on opposite sides of the second heat dissipation plate 17b in the thickness direction, and two third device groups 133a, 133b may be respectively mounted on opposite sides of the third heat dissipation plate 17 c.

As shown in fig. 2, the first heat dissipation plate 17a and the second heat dissipation plate 17b are located on opposite sides of the third heat dissipation plate 17c, respectively, in the thickness direction of the third heat dissipation plate 17c, i.e., in the direction indicated by arrow y+/Y-in the drawing. The first heat dissipation plate 17a and the second heat dissipation plate 17b are located on the same side of the third heat dissipation plate 17c in the width direction of the third heat dissipation plate 17c, i.e., in the direction indicated by arrow z+/Z-in the drawing. The first heat dissipation plate 17a and the second heat dissipation plate 17b may be disposed at an angle such that the distance therebetween gradually increases as it is farther from the third heat dissipation plate 17 c. With this arrangement, the three heat dissipation plates 17 are substantially Y-shaped as viewed from the perspective of fig. 2.

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

The conventional power module generally adopts a whole flat busbar. Since the first heat dissipation plate 17a and the second heat dissipation plate 17b form an angle, if a conventional flat busbar is adopted to match with the first heat dissipation plate, the first heat dissipation plate 17a and the second heat dissipation plate 17b cannot simultaneously obtain a proper angle relative to the busbar. If the included angle between a certain heat dissipation plate 17 and the busbar is not suitable, the length of the line from the first and second device groups 131 and 132 on the heat dissipation plate 17 to the busbar is longer, and the difference between the lengths of the lines is larger, which raises the stray inductance.

In view of this, the power module 10 according to the embodiment of the utility model employs a busbar assembly 11 with an improved structure. As shown in fig. 1 to 4 and 7, the busbar assembly 11 may include two busbars 111, i.e., a first busbar 111a and a second busbar 111b. The first busbar 111a and the second busbar 111b are electrically connected, the first busbar 111a and the second busbar 111b are arranged at an angle, and each busbar 111 of the first busbar 111a and the second busbar 111b carries a plurality of capacitors 12 and is electrically connected with a plurality of device groups.

For example, the first busbar 111a may carry a plurality of capacitors 12a and is electrically connected to the first device component 131 on the first heat spreader 17a through the first busbar 15a and is electrically connected to the second device component 132 on the first heat spreader 17a through the second busbar 15b, and the second busbar 111b may carry a plurality of capacitors 12b and is electrically connected to the first device component 131 on the second heat spreader 17b through the third busbar 15c and is electrically connected to the second device component 132 on the second heat spreader 17b through the fourth busbar 15 d.

The busbar assembly 11 includes a first busbar 111a and a second busbar 111b electrically connected and arranged at an angle, and the first busbar 111a and the second busbar 111b may have an appropriate angle with respect to the first heat spreader plate 17a and the second heat spreader plate 17b, respectively. This helps ensure that, for either of the first heat dissipation plate 17a and the second heat dissipation plate 17b, the lines from the first device group 131 thereon to the busbar assembly 11 and the lines from the second device group 132 thereon to the busbar assembly 11 are both shorter, and the difference in lengths of the two lines is smaller. Shorter lines and smaller line length differences help reduce stray inductance. In the width direction of the third heat dissipation plate 17c, compared with the previous first busbar 111a and the previous second busbar 111b arranged on the same horizontal plane, the first busbar 111a and the second busbar 111b arranged at an included angle reduce the width, and further reduce the volume.

There are various ways to electrically connect the first busbar 111a and the second busbar 111b, and the embodiment of the present utility model is not limited thereto. For example, the first busbar 111a and the second busbar 111b may be integrally formed by bending a whole plate body, which may reduce impedance between the first busbar 111a and the second busbar 111 b. For another example, the first busbar 111a and the second busbar 111b may be directly connected together by two independent plates, which may reduce the cost of the forming mold. As another example, the first busbar 111a and the second busbar 111b may be electrically connected through a middleware, such as a copper bar, etc., which may further simplify the structure.

As an exemplary implementation, referring to fig. 3 and 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 is also provided with a lug portion 112 protruding toward the first busbar 111 a. The lug portions 112 of the first busbar 111a are connected with the lug portions 112 of the second busbar 111b to achieve electrical and physical connection of the first busbar 111a with the second busbar 111 b.

There are various connection manners of the two lug portions 112 of the first busbar 111a and the second busbar 111b, and the embodiment of the present utility model is not limited thereto. For example, two lug portions 112 may be connected together by fasteners. As another example, the two tab portions 112 may be joined together by welding, locking, riveting, plugging, or bonding.

As an exemplary implementation, referring to fig. 3, 7 and 8, two lug portions 112 of the first busbar 111a and the second busbar 111b may be arranged in a stacked manner, that is, one lug portion 112 may be mounted on the other lug portion 112. The busbar assembly 11 may further include a fastener 113 passing through the two lug portions 112 to fasten the two lug portions 112 together. The mode has the advantages of reliable connection, simple structure, convenient disassembly and assembly, and the like.

By way of example only, the two lug portions 112 of the first and second bus bars 111a, 111b may be fastened (i.e., bolts and nuts) by two fasteners 113, which may 113 be spaced apart along the X+/X-direction. It will be appreciated that in other examples, two lug portions 112 may be fastened (e.g., staked) by only one fastener 113, or two lug portions 112 may be fastened by three or more fasteners 113, etc.

As shown in fig. 9, each busbar 111 may include a plurality of electrode plates 114, i.e., positive electrode plates 114a, negative electrode plates 114b, and neutral electrode plates 114c, in a stacked arrangement. For example, neutral plate 114c may be positioned between positive plate 114a and negative plate 114 b. Positive plate 114a may be used to provide a positive terminal, negative plate 114b may be used to provide a negative terminal, and neutral plate 114c may be used to provide a neutral terminal. In some embodiments, each busbar 111 may also include two insulating layers 115, with one insulating layer 115 between neutral plate 114c and negative plate 114b and the other insulating layer 115 between positive plate 114a and neutral plate 114c.

With continued reference to fig. 3, 7, and 8, each busbar 111 may be provided with a plurality of tab portions 112, and the plurality of tab portions 112 may include a positive tab portion 112a and a negative tab portion 112b. The positive electrode tab portion 112a may be provided by the positive electrode plate 114a, i.e., the positive electrode tab portion 112a may be part of the positive electrode plate 114a or connected to the positive electrode plate 114 a. The negative electrode tab portion 112b may be provided by the negative electrode plate 114b, i.e., the negative electrode tab portion 112b may be part of the negative electrode plate 114b or connected to the negative electrode plate 114 b. The positive electrode tab portion 112a of the first busbar 111a is connected to the positive electrode tab portion 112a of the second busbar 111b, and the negative electrode tab portion 112b of the first busbar 111a is connected to the negative electrode tab portion 112b of the second busbar 111 b. In this way, electrical connection of the positive and negative electrode plates 114a, 114b of the two bus bars 111 may be achieved, while the two bus bars 111 may be physically connected together.

Further, with continued reference to fig. 3, 7 and 8, each busbar 111 may have a plurality of positive electrode tab portions 112a and a plurality of negative electrode tab portions 112b, and the plurality of positive electrode tab portions 112a and the plurality of negative electrode tab portions 112b may be alternately arranged. In this way, the physical connection strength of the two busbar 111 can be improved, so that the current distribution is more balanced. Further, any adjacent positive electrode tab portion 112a and negative electrode tab portion 112b may be spaced apart to ensure insulation between the positive electrode plate 114a and negative electrode plate 114 b.

In the present embodiment, each busbar 111 is electrically connected to a set U, V, W of three-phase cells, which makes it possible for phase cells connected to different busbars 111 to interfere with each other if the neutral plates 114c of two busbars 111 are electrically connected. In view of this, in one non-limiting example, the neutral plates 114c of the first busbar 111a and the neutral plates 114c of the second busbar 111b may be spaced apart such that the neutral plates 114c of the two busbars 111 are not electrically connected, thereby avoiding interference with phase cells connected to different busbars 111.

It should be noted that, in other embodiments of the present utility model, the neutral plates 114c of the two busbar 111 may also be electrically connected. For example, in the power module 10a described below, the two bus bars 111 are electrically connected together with a group U, V, W of three-phase units, in which case no problem of interference between the phase units will occur. Accordingly, in the power module 10a described below, the neutral plates 114c of the two rows 111 may be connected together to increase the overall structural strength of the busbar assembly 11 and to reduce the impedance between the two busbars 111.

Returning to fig. 2, the first heat spreader plate 17a may be disposed perpendicular to the first busbar 111a, which helps shorten the line of the first and second device groups 131, 132 on the first heat spreader plate 17a to the first busbar 111a, and helps reduce the difference in length of the two lines, thereby reducing stray inductance. Similarly, the second heat dissipation plate 17b may be disposed perpendicular to the second busbar 111b to shorten the line from the first and second device groups 131 and 132 to the second busbar 111bb on the second heat dissipation plate 17a and reduce the difference in length between the two lines, thereby reducing the stray inductance.

It should be noted that references herein to "parallel" and "perpendicular" should be understood as "substantially parallel" and "substantially perpendicular", respectively, and reasonable error ranges should be included. For example, the error range may be ±10°.

With continued reference to fig. 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.

The included angle beta 1 can meet the requirement that beta 1 is more than or equal to 130 degrees and less than or equal to 170 degrees.

If the included angle β1 is too large or too small, the lines from the first and second device groups 131 and 132 on the first heat dissipation plate 17a to the third device group 133 on the third heat dissipation plate 17c are longer, and the difference between the two lines is larger, which raises the stray inductance. Setting the included angle β1 to meet the above range contributes to shorter two lines and smaller difference, thereby reducing stray inductance.

Preferably, the included angle β1 may satisfy 140 ° Σ≤β1≤160°.

In this way, the two line lengths can be further made to coincide to further reduce stray inductance.

More preferably, the included angle β1 may satisfy β1=150°.

In this way, the two line lengths can be further made to coincide to further reduce stray inductance.

Alternatively, the included angle β1 may be any one of 135 °, 145 °, 155 °, and 165 °.

The included angle beta 2 can meet the requirement that beta 2 is more than or equal to 130 degrees and less than or equal to 170 degrees.

If the included angle β2 is too large or too small, the lines from the first and second device groups 131 and 132 on the second heat spreader 17a to the third device group 133 on the third heat spreader 17c are longer, and the difference between the two lines is larger, which raises the stray inductance. Setting the included angle β2 to meet the above range contributes to shorter two lines and smaller differences, thereby reducing stray inductance.

Preferably, the included angle β2 may satisfy 140 ° and β2 and 160 °.

In this way, the two line lengths can be further made to coincide to further reduce stray inductance.

More preferably, the included angle β2 may satisfy β2=150°.

In this way, the lengths of the two lines can be further made to be consistent, so that stray inductance is further reduced.

Alternatively, the included angle β2 may be any one of 135 °, 145 °, 155 °, 165 °.

The included angle alpha can satisfy alpha is more than or equal to 80 degrees and less than or equal to 160 degrees.

Accordingly, for the first heat dissipation plate 17a and the second heat dissipation plate 17b arranged at an included angle, the first busbar 111a and the second busbar 111b can have a suitable included angle with the first heat dissipation plate 17a and the second heat dissipation plate 17b respectively, so that stray inductance can be reduced.

Preferably, the included angle α may satisfy 100+.α≤140 °.

Reducing included angle α within a certain range helps to reduce the size of busbar assembly 11 in the y+/Y-direction, where the size of busbar assembly 11 in the y+/Y-direction is defined by two rows of wires 111. When the included angle α is too small, the size of the busbar assembly 11 at y+/Y-will be defined by the capacitance 12, and further decreasing the included angle α will instead increase the overall size of the busbar assembly 11. Under the condition that the included angle alpha is more than or equal to 100 degrees and less than or equal to 140 degrees, the first busbar 111a and the second busbar 111b can respectively have a proper included angle with the first radiating plate 17a and the second radiating plate 17b, and the size of the busbar assembly 11 in the Y+/Y-direction is smaller.

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

At α=120°, the first busbar 111a and the second busbar 111b will be arranged perpendicularly to the first heat dissipation plate 17a, respectively, in accordance with the conditions β1=150° and β2=150°. In this arrangement, the first and second device groups 131, 132 have shorter line distances to the busbar assembly 111 and smaller length differences, and the first and second device groups 131, 132 have shorter line distances to the third device group 133 and smaller length differences, which helps the power module 10 to obtain smaller stray inductances and more uniform current distribution.

Alternatively, the included angle α may be any value of 85 °, 90 °, 95 °, 105 °,110 °, 115 °, 125 °,130 °, 135 °,150 °, 155 °.

Referring to fig. 2 and 10, the first wire row 15a may have a first bent portion 151 and a second bent portion 152 connected to each other, and the second wire row 15b may have a third bent portion 153 and a fourth bent portion 154 connected to each other. The first bending part 151 may be parallel to the first heat dissipation plate 17a and connected to the first device group 131 on the first heat dissipation plate 17 a. The second bending portion 152 may be bent toward a side facing away from the first heat dissipation plate 17a, parallel to the first busbar 111a, and connected to the first busbar 111 a. The third bent portion 153 may be parallel to the first heat dissipation plate 171a and connected to the second device group 132 on the first heat dissipation plate 17 a. The fourth bending portion 154 may be bent toward a side facing away from the first heat dissipation plate 17a, parallel to the first busbar 111a, and connected to the first busbar 111 a.

In this way, the first and second wire rows 15a and 15b are less bent, the lines from the first and second device groups 131 and 132 on the first heat dissipation plate 17a to the first busbar 111a are shorter, and the difference between the two lines is smaller, so that the stray inductance is smaller. In addition, according to this configuration, the first heat dissipation plate 17a will not shield the second and fourth bent portions 152 and 154, so that the second and fourth bent portions 152 and 154 can be more conveniently connected to the first busbar 111a, for example, by fasteners.

With continued reference to fig. 2 and 10, the plurality of capacitors 12 on the first busbar 111a may be divided into three rows of capacitors 12, each row of capacitors 12 being arranged along the x+/X-direction, the three rows of capacitors 12 being arranged at intervals. Between any two adjacent rows of capacitors 12, the first busbar 111a has connections not occupied by capacitors 12. Three rows of capacitors 12 may form two connections 116, 117. The front projection of the second bending portion 152 on the first busbar 111a may at least partially overlap the connection portion 116, and a fastener (not shown) may pass through the second bending portion 152 and the connection portion 116 to connect them together. The front projection of the fourth bending portion 154 on the first busbar 111a may at least partially overlap the connection portion 117, and a fastener (not shown) may pass through the fourth bending portion 154 and the connection portion 117 to connect them together. According to this configuration, the connection of the first and second banks 15a, 15b to the first busbar 111a will eliminate the need for the connection of copper pillars, which helps to shorten the wiring of the first and second device groups 131, 132 on the first heat dissipation plate 17a to the first busbar 111a, thereby reducing the stray inductance.

Referring to fig. 2 and 11, the third line 15c may have fifth and sixth bent portions 155 and 156 connected, and the fourth line 15d may have seventh and eighth bent portions 157 and 158 connected. The fifth bent portion 155 may be parallel to the second heat dissipation plate 17b and connected to the first device group 131 on the second heat dissipation plate 17 b. The sixth bending portion 156 may be bent toward a side facing away from the second heat dissipation plate 17b, parallel to the second busbar 111b, and connected to the second busbar 111 b. The seventh bending portion 157 is parallel to the second heat dissipation plate 17b and connected to the second device group 132 on the second heat dissipation plate 17 b. The eighth bending portion 158 is bent to a side facing away from the second heat dissipation plate 17b, is parallel to the second busbar 111b, and is connected to the second busbar 111 b.

In this way, the third line 15c and the fourth line 15d are less bent, the lines from the first and second device groups 131 and 132 on the second heat dissipation plate 17b to the second busbar 111b are shorter, and the difference between the two lines is smaller, so that the stray inductance is smaller. In addition, according to this configuration, the second heat dissipation plate 17b will not shield the sixth and eighth bent portions 156 and 158, so that the sixth and eighth bent portions 156 and 158 can be more conveniently connected to the second busbar 111b, for example, by fasteners.

With continued reference to fig. 2 and 11, the plurality of capacitors 12 on the second busbar 111b may be divided into three rows of capacitors 12, each row of capacitors 12 being arranged along the x+/X-direction, the three rows of capacitors 12 being arranged at intervals. Between any two adjacent rows of capacitors 12, the second busbar 111b has connections not occupied by capacitors 12. Three rows of capacitors 12 may form two connections 118, 119. The orthographic projection of the sixth bending portion 156 on the second busbar 111b may at least partially overlap the connecting portion 118, and a fastener (not shown) may connect the sixth bending portion 156 and the connecting portion 118 together through the two. The orthographic projection of the eighth bending portion 158 on the second busbar 111b may at least partially overlap the connecting portion 119, and a fastener (not shown in the drawing) may connect the eighth bending portion 158 and the connecting portion 119 together through the two portions. According to this configuration, the connection of the third and fourth banks 15a, 15d with the second busbar 111b will eliminate the need for the connection of copper pillars, which helps to shorten the wiring of the first and second device groups 131, 132 on the second heat dissipation plate 17b to the second busbar 111b, thereby reducing the stray inductance.

Another embodiment of the present utility model provides a power module 10a. The power module 10a hereinafter has many identical elements to the power module 10 above. For the sake of brevity, these same elements will be given the same reference numerals in the context to omit duplicate descriptions as appropriate.

Referring to fig. 12 and 13, unlike the power module 10 of the foregoing embodiment, which includes six phase units 13, the present embodiment provides a power module 10a that may include only three phase units 13, i.e., a first phase unit composed of a first device group 131a, a second device group 132a, and a third device group 133a, a first phase unit composed of a first device group 131b, a second device group 132b, and a third device group 133b, and a first phase unit composed of a first device group 131c, a second device group 132c, and a third device group 133 c.

Each heat dissipation plate 17 may be provided with a device group on only one side.

Specifically, one side of the first heat dissipation plate 17a in the thickness direction may be provided with a first device group 131, and the first device group 131 may be connected to the first busbar 111a, for example, through the first busbar 15a. The second heat dissipation plate 17b may be provided at one side in the thickness direction thereof with a second device group 132, and the second device group 132 may be connected to the second busbar 111b, for example, through the second wire row 15b. A third device group 133 may be provided on one side of the third heat dissipation plate 17c in the thickness direction, and the first device group 131 on the first heat dissipation plate 17a and the second device group 132 on the second heat dissipation plate 17b may be electrically connected to the third device group 133 on the third heat dissipation plate 17c, for example, through two wire rows 15, respectively.

The present utility model further provides a power conversion device 100. As shown in fig. 14, the power conversion apparatus 100 may include a cabinet 20, and a dc fuse 30, a dc isolating switch 40, the power module 10, the reactor 50, the ac filter capacitor 60, and the ac circuit breaker 70, which are housed in the cabinet 20 and electrically connected in this order.

In particular, as shown in fig. 14, the power conversion apparatus 100 may include two reactors 50, one reactor 50 may be electrically connected to the ac terminals 14a, 14c, 14e of the three phase units, and the other reactor 50 may be electrically connected to the ac terminals 14b, 14d, 14f of the other three phase units.

It should be understood that the term "include" and its variants as used in connection with embodiments of the present utility model are intended to be open ended, i.e., including, but not limited to. The term "according to" is based, at least in part, on. The term "one embodiment" means "at least one embodiment" and the term "another embodiment" means "at least another embodiment".

It should be understood that although the terms "first" or "second," etc. may be used in embodiments of the present utility model to describe various elements, e.g., a first busbar and a second busbar, these elements are not provided by these terms, and these terms are merely used to distinguish one element from another element.

The scope of the present utility model is not limited to the above embodiments, and any person skilled in the art may conceive of changes or substitutions within the technical scope of the present utility model, which are intended to be covered by the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (17)

1. The busbar assembly is characterized by comprising a first busbar, a second busbar and a capacitor, wherein 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 is arranged at an included angle with the second busbar.

2. The busbar assembly of claim 1, wherein a side edge of the first busbar facing the second busbar is formed with a tab portion, and a side edge of the second busbar facing the first busbar is also formed with a tab portion, the tab portion of the first busbar being connected to the tab portion of the second busbar.

3. The busbar assembly of claim 2, wherein the lug portions of the first busbar are arranged in a stack with the lug portions of the second busbar;

the busbar assembly further includes a fastener passing through the lug portions of the first busbar and the lug portions of the second busbar to connect the two.

4. The busbar assembly of claim 2, wherein each busbar includes a positive plate and a negative plate arranged in a stacked arrangement, each busbar being provided with a plurality of tab portions including a positive tab portion provided by the positive plate and a negative tab portion provided by the negative plate, the positive tab portion of the first busbar being connected to the positive tab portion of the second busbar and the negative tab portion of the first busbar being connected to the negative tab portion of the second busbar.

5. The busbar assembly of claim 4, wherein 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 being alternately arranged, and any adjacent positive tab portions and negative tab portions being spaced apart.

6. The busbar assembly of claim 4, wherein each busbar further comprises a neutral plate in stacked arrangement with the positive and negative plates, the neutral plates of the first busbar being spaced apart from or electrically connected to the neutral plates of the second busbar.

7. The busbar assembly according to any one of claims 1 to 6, wherein the first busbar and the second busbar have an included angle a, the included angle a satisfying 80 ° -a-160 °.

8. A power module comprising a busbar assembly according to any one of claims 1 to 7.

9. The power module of claim 8, further comprising a first heat spreader plate, a second heat spreader plate, a third heat spreader plate, a first device group, a second device group, and a third device group;

One side of the first radiating plate in the thickness direction is provided with a first device group, and the first device group on the first radiating plate is connected with the first busbar;

One side of the second heat dissipation plate in the thickness direction is provided with a second device group, and the second device group on the second heat dissipation plate is connected with the second busbar;

One side of the third radiating plate in the thickness direction is provided with a third device group, and the first device group on the first radiating plate is electrically connected with the second device group on the second radiating plate and the third device group on the third radiating plate.

10. The power module of claim 8, further comprising a first heat spreader plate, a second heat spreader plate, a third heat spreader plate, two first device groups, two second device groups, and two third device groups;

a first device group and a second device group are respectively arranged on two opposite sides of the thickness direction of the first heat radiation plate, and the first device group and the second device group on the first heat radiation plate are connected with the first busbar;

The two opposite sides of the second heat dissipation plate in the thickness direction are respectively provided with another first device group and another second device group, the first device group and the second device group on the second radiating plate are connected with the second busbar;

Two third device groups are respectively arranged on two opposite sides of the thickness direction of the third heat dissipation plate, one third device group is electrically connected with the first device group and the second device group on the first heat dissipation plate, and the other third device group is electrically connected with the first device group and the second device group on the second heat dissipation plate.

11. The power module of claim 10, wherein the first heat sink is disposed perpendicular to the first busbar and/or the second heat sink is disposed perpendicular to the second busbar.

12. The power module according to claim 11, wherein the first heat dissipation plate and the third heat dissipation plate have an angle β1, the angle β1 satisfying 130 ° - β1-170 °, and/or the second heat dissipation plate and the third heat dissipation plate have an angle β2, the angle β2 satisfying 130 ° - β2-170 °.

13. The power module of claim 10, wherein:

The first line row is provided with a first bending part and a second bending part which are connected, the second line row is provided with a third bending part and a fourth bending part which are connected, the first bending part is parallel to the first radiating plate and is connected with a first device group on the first radiating plate, the second bending part is bent towards one side which is away from the first radiating plate, is parallel to the first busbar and is connected with the first busbar, the third bending part is parallel to the first radiating plate and is connected with a second device group on the first radiating plate, the fourth bending part is bent towards one side which is away from the first radiating plate, is parallel to the first busbar and is connected with the first busbar, and/or,

The solar heat collector comprises a first heat radiation plate, a second heat radiation plate, a third wire row and a fourth wire row, wherein the third wire row is provided with a fifth bending part and a sixth bending part which are connected, the fourth wire row is provided with a seventh bending part and an eighth bending part which are connected, the fifth bending part is parallel to the second heat radiation plate and is connected with a first device group on the second heat radiation plate, the sixth bending part is bent towards one side which is away from the second heat radiation plate, is parallel to a second busbar and is connected with the second busbar, the seventh bending part is parallel to the second heat radiation plate and is connected with a second device group on the second heat radiation plate, and the eighth bending part is bent towards one side which is away from the second heat radiation plate, is parallel to the second busbar and is connected with the second busbar.

14. The power module of claim 13, wherein:

The plurality of capacitors on the first busbar being divided into three rows of capacitors arranged at intervals to form two connecting portions on the first busbar not occupied by the plurality of capacitors, the orthographic projection of the second bending portion on the first busbar being at least partially overlapped with one connecting portion, a fastener passing through the second bending portion and the one connecting portion to connect the two together, the orthographic projection of the fourth bending portion on the first busbar being at least partially overlapped with the other connecting portion, a fastener passing through the fourth bending portion and the other connecting portion to connect the two together, and/or

The capacitors on the second busbar are divided into three rows of capacitors, the three rows of capacitors are arranged at intervals to form two connecting parts which are not occupied by the capacitors on the second busbar, the orthographic projection of the sixth bending part on the second busbar is at least partially overlapped with one connecting part, a fastener penetrates through the sixth bending part and the one connecting part to connect the sixth bending part and the one connecting part together, the orthographic projection of the eighth bending part on the second busbar is at least partially overlapped with the other connecting part, and the fastener penetrates through the eighth bending part and the other connecting part to connect the eighth bending part and the other connecting part together.

15. The power module of claim 9 or 10, wherein the first device group is connected to the positive and neutral terminals of the busbar assembly, the second device group is connected to the negative and neutral terminals of the busbar assembly, and the third device group is connected to the same phase of three alternating current phases.

16. The power module of claim 15 wherein the first device group, the second device group, and the third device group are each an IGBT device group, each IGBT device group comprising a plurality of IGBT devices connected in parallel.

17. A power conversion device, characterized by comprising a cabinet body, and a direct current fuse, a direct current isolating switch, a power module, a reactor, an alternating current filter capacitor and an alternating current breaker which are contained in the cabinet body and are electrically connected in sequence, wherein the power module is the power module of any one of claims 8 to 16.