A fast power module and a power module group

Abstract

A fast power module includes a first power electrode, a second power electrode, and an output electrode for conducting current to the power module; the first power electrode includes a first power electrode main body, a first connection portion of the first power electrode, and a second connection portion of the first power electrode, the second power electrode includes a second power electrode main body, a first connection portion of the second power electrode, and a second connection portion of the second power electrode, both the first power electrode main body and the second power electrode main body are sheet-shaped and stacked, and a first insulating layer is stacked between the first power electrode main body and the second power electrode main body; both the second connection portion of the first power electrode and the second connection portion of the second power electrode are sheet-shaped and stacked, and the stacked interval between the second connection portion of the first power electrode and the second connection portion of the second power electrode is set as an accommodation space for accommodating an external connection terminal. It can effectively simplify the structure of the power module and reduce the parasitic inductance of the entire power module system.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and particularly to a fast power module and a power module group. Background Art

[0002] A power module is a power electronic device such as a metal oxide semiconductor (power MOS transistor), an insulated gate field effect transistor (IGBT), and a fast recovery diode (FRD) packaged into a power switch module according to a certain functional combination, and is mainly used for power conversion in various applications such as electric vehicles, wind power generation, and industrial frequency conversion.

[0003] The motor drive circuit of an electric vehicle usually includes three groups of power modules each having upper and lower bridge arms. Figure 1 FIG. 13 is a circuit schematic diagram of an existing power module, which shows a circuit schematic diagram of a group of power modules having upper and lower bridge arms, including: an insulated gate field effect transistor Z1 as the upper bridge arm, and a fast recovery diode D1 reversely connected in parallel therewith; an insulated gate field effect transistor Z2 as the lower bridge arm, and a fast recovery diode D2 reversely connected in parallel therewith. The collector of the insulated gate field effect transistor Z1 is connected to the positive electrode p+ of the power module, its emitter is connected to the collector of the insulated gate field effect transistor Z2, the emitter of the insulated gate field effect transistor Z2 is connected to the negative electrode p- of the power module, and the emitter of the insulated gate field effect transistor Z1 and the collector of Z2 are commonly connected to the output terminal of the power module. In practical applications, usually three groups of such power modules are used to provide three-phase alternating current for the motor; here, only the circuit schematic diagram of a group of power modules is used to illustrate its working principle: when the insulated gate field effect transistor Z1 is turned on, the current flows through the positive electrode p+ of the power module, the collector, emitter of the insulated gate field effect transistor Z1, and the output terminal OUTPUT of the power module in sequence and is output to the motor; when the insulated gate field effect transistor Z1 is turned off, since the motor is an inductive load, to ensure that the current flow direction remains unchanged, the freewheeling current needs to flow through other groups of power modules and is output to the motor through the negative electrode p- of this power module, the diode D2, and the output terminal OUTPUT of the power module.

[0004] In some practical applications, the electronic devices in the power module can also use power MOS transistors. Figure 2It is a circuit schematic diagram of another power MOS transistor module, which includes: a power MOS transistor M1 as the upper arm, a power MOS transistor M2 as the lower arm. The drain of the power MOS transistor M1 is connected to the positive pole p+ of the power module, the source of the power MOS transistor M1 is connected to the drain of the power MOS transistor M2, the source of the power MOS transistor M2 is connected to the negative pole p- of the power module, and the source of the power MOS transistor M1 and the drain of the power MOS transistor M2 are commonly connected to the output terminal of the power module. Its working principle is similar to that of the module using insulated gate field effect transistors. The main difference between the two is that the power MOS transistor has a built-in reverse diode, so there is no need to connect a reverse diode in parallel. In addition, the reverse conducting IGBT has the same structure and function as the power MOS. Due to the built-in diode, there is no need to connect a reverse diode in parallel. The module design and structure are similar to those of the power MOS, which will not be elaborated here.

[0005] In practical applications, parasitic inductance has always been the main problem to be overcome in the application of power electronic devices, especially in the high-frequency and high-power application scenarios of power MOS transistors. The parasitic inductance inside the module will cause overvoltage during the turn-off process, and the parasitic parameters will cause voltage spikes and waveform oscillations during the switching process of the power module, thereby increasing electromagnetic interference and switching losses, and even damaging the module. Summary of the Invention

[0006] To solve the problems existing in the prior art, the present invention provides a fast power module, which includes a first power electrode, a second power electrode, and an output electrode for conducting current to the power module; the first power electrode includes a first power electrode main body, a first power electrode first connection part, and a first power electrode second connection part, the second power electrode includes a second power electrode main body, a second power electrode first connection part, and a second power electrode second connection part. The first power electrode main body is connected to the corresponding conductive layer inside the power module through the first power electrode first connection part, the second power electrode main body is connected to the corresponding conductive layer inside the power module through the second power electrode first connection part. The first power electrode main body and the second power electrode main body are both sheet-shaped and arranged in a stacked manner, and a first insulating layer is stacked between the first power electrode main body and the second power electrode main body; the first power electrode second connection part and the second power electrode second connection part are both sheet-shaped and arranged in a stacked manner. The first power electrode second connection part extends from the first power electrode main body to the outside of the power module, and the second power electrode second connection part extends from the second power electrode main body to the outside of the power module. The stacked interval between the first power electrode second connection part and the second power electrode second connection part is set as a receiving space for accommodating external connection terminals, and the external connection terminals are respectively connected to the corresponding first power electrode second connection part and the second power electrode second connection part.

[0007] Furthermore, the first insulating layer completely covers the overlapping surfaces of the first power electrode body and the second power electrode body that face each other, and extends to the outside of the edge of this overlapping surface.

[0008] Furthermore, the second connection portion of the first power electrode and the second connection portion of the second power electrode diverge at the overlapping end of the first power electrode body and the second power electrode body and then extend to the outside of the power module, so as to form an overlapping interval adapted to the thickness of the external connection terminal between the second connection portion of the first power electrode and the second connection portion of the second power electrode.

[0009] Furthermore, the second connection portion of the first power electrode is provided with a first power electrode connection hole, and the second connection portion of the second power electrode is provided with a second power electrode connection hole whose position corresponds to that of the first power electrode connection hole.

[0010] Furthermore, the power module further includes an insulating substrate, a first arm conductive layer, a second arm conductive layer, an output electrode conductive layer, a first power electrode conductive layer, a second power electrode conductive layer provided on the insulating substrate, a first arm power chip provided on the first arm conductive layer, and a second arm power chip provided on the second arm conductive layer; the first arm power chip is electrically connected to the first power electrode through the first power electrode conductive layer, and the first arm power chip is electrically connected to the output electrode through the output electrode conductive layer; the second arm power chip is electrically connected to the second power electrode through the second power electrode conductive layer, and the second arm power chip is electrically connected to the output electrode through the output electrode conductive layer; the first arm conductive layer and the second arm conductive layer are provided on both sides of the insulating substrate, the first power electrode conductive layer and the second power electrode conductive layer are provided between the first arm conductive layer and the second arm conductive layer, the first connection portion of the first power electrode is welded to the first power electrode conductive layer, and the first connection portion of the second power electrode is welded to the second power electrode conductive layer.

[0011] An embodiment of the present invention further provides a power module, which includes the power module provided in any of the above technical solutions, a capacitor bank, a first capacitor lead electrode, and a second capacitor lead electrode. The first capacitor lead electrode includes a first capacitor lead electrode body and a first capacitor lead electrode connection portion. The second capacitor lead electrode includes a second capacitor lead electrode body and a second capacitor lead electrode connection portion. One end of the first capacitor lead electrode body is electrically connected to the corresponding electrode of the capacitor bank. The second capacitor lead electrode body is electrically connected to the corresponding electrode of the capacitor bank. The first capacitor lead electrode body and the second capacitor lead electrode body are both sheet-shaped and are stacked. The first capacitor lead electrode connection portion is sheet-shaped and extends outward from the first capacitor lead electrode body. The second capacitor lead electrode connection portion is sheet-shaped and extends outward from the second capacitor lead electrode body. The first capacitor lead electrode connection portion and the second capacitor lead electrode connection portion are stacked and are inserted into the accommodation space. A second insulating layer is provided between the first capacitor lead electrode connection portion and the second capacitor lead electrode connection portion. The first capacitor lead electrode connection portion is connected to the second connection portion of the first power electrode. The second capacitor lead electrode connection portion is connected to the second connection portion of the second power electrode.

[0012] Further, the second insulating layer completely covers the stacked surfaces of the first capacitor lead electrode connection portion and the second capacitor lead electrode connection portion that face each other and extends to the outside of the edge of the stacked surface.

[0013] Further, a third insulating layer is provided between the first capacitor lead electrode body and the second capacitor lead electrode body.

[0014] Further, the third insulating layer completely covers the stacked surfaces of the first capacitor lead electrode body and the second capacitor lead electrode body that face each other and extends to the outside of the edge of the stacked surface.

[0015] Further, the first capacitor lead electrode connection portion is provided with a first capacitor lead electrode connection hole corresponding to the first power electrode connection hole. The second capacitor lead electrode connection portion is provided with a second capacitor lead electrode connection hole corresponding to the second power electrode connection hole. An insulating pad is provided above the second connection portion of the first power electrode. A nut is provided below the second connection portion of the second power electrode. A bolt sequentially passes through the insulating pad, the first power electrode connection hole, the first capacitor lead electrode connection hole, the second insulating layer, the second capacitor lead electrode connection hole, and the second power electrode connection hole and is connected to the nut. The bolt is insulated from the second connection portion of the first power electrode and the first capacitor lead electrode connection portion.

[0016] A plug-in power module provided by the present invention includes a first power electrode, a second power electrode, and an output electrode for conducting current to the power module; the first power electrode includes a first power electrode main body, a first connection portion of the first power electrode, and a second connection portion of the first power electrode, and the second power electrode includes a second power electrode main body, a first connection portion of the second power electrode, and a second connection portion of the second power electrode. The first power electrode main body is connected to a corresponding conductive layer inside the power module through the first connection portion of the first power electrode, and the second power electrode main body is connected to a corresponding conductive layer inside the power module through the first connection portion of the second power electrode. The first power electrode main body and the second power electrode main body are both sheet-shaped and stacked, and a first insulating layer is stacked between the first power electrode main body and the second power electrode main body; the second connection portion of the first power electrode and the second connection portion of the second power electrode are both sheet-shaped and stacked. The second connection portion of the first power electrode extends from the first power electrode main body to the outside of the power module, and the second connection portion of the second power electrode extends from the second power electrode main body to the outside of the power module. The stacked interval between the second connection portion of the first power electrode and the second connection portion of the second power electrode is set as a receiving space for accommodating external connection terminals, and the external connection terminals are respectively connected to the corresponding second connection portion of the first power electrode and the second connection portion of the second power electrode. It can effectively reduce the parasitic inductance of the entire power module. In addition, the present invention also provides a power module using the above power module. Description of the Drawings

[0017] Figure 1 is a circuit schematic diagram of an existing power module;

[0018] Figure 2 is a circuit schematic diagram of another existing power module;

[0019] Figure 3 is a structural diagram of a single-module implementation of a plug-in power module provided in Embodiment 1 of the present invention;

[0020] Figure 4 is a structural diagram of a multi-module integration implementation of a plug-in power module provided in Embodiment 2 of the present invention;

[0021] Figure 5 is a structural diagram of a single-module implementation of a plug-in power module provided in Embodiment 3 of the present invention;

[0022] Figure 6 is a structural diagram of a power module provided in Embodiment 4 of the present invention;

[0023] Figure 7 is a structural diagram of the connection between the power module and the capacitor bank electrodes in a power module provided in Embodiment 5 of the present invention;

[0024] Figure 8It is a three-dimensional structure diagram of a power module provided in Embodiment 6 of the present invention;

[0025] Figure 9 It is a side view structure diagram of a power module provided in Embodiment 7 of the present invention;

[0026] Figure 10 It is a three-dimensional structure diagram of a power module provided in Embodiment 8 of the present invention. Detailed implementation manners

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Such as Figure 3 And Figure 4 shown, a fast power module includes a first power electrode 10, a second power electrode 20, and an output electrode 30 for conducting current to the power module; the first power electrode 10 includes a first power electrode main body 11, a first power electrode first connection portion 12, and a first power electrode second connection portion 13, the second power electrode 20 includes a second power electrode main body 21, a second power electrode first connection portion 22, and a second power electrode second connection portion 23, the first power electrode main body 11 is connected to a corresponding conductive layer inside the power module through the first power electrode first connection portion 12, and the second power electrode main body 21 is connected to a corresponding conductive layer inside the power module through the second power electrode first connection portion 22. Specifically, in some practical applications, such as Figure 3 And Figure 4 shown, the first power electrode main body 11 and the first power electrode first connection portion 12 are integrally formed on the same metal sheet, and the first power electrode main body 11 and the first power electrode first connection portion 12 are not two mutually exclusive concepts. In some practical applications, the first power electrode main body and the first power electrode first connection portion can be realized by different parts of the same structure; the second power electrode main body 21 and the second power electrode first connection portion 22 are integrally formed on the same metal sheet, and the second power electrode main body 21 and the second power electrode first connection portion 22 are not two mutually exclusive concepts. In some practical applications, the second power electrode main body 21 and the second power electrode first connection portion 22 can be realized by different parts of the same structure, such as Figure 3As shown, the second power electrode main body 21 and the first connection part 22 of the second power electrode are substantially located on the same metal sheet. The end of this metal sheet connected to the conductive layer of the second power electrode realizes the function of the second connection part of the second power electrode. Here, the first connection part 22 of the second power electrode is a part of the second power electrode main body 21; both the first power electrode main body 11 and the second power electrode main body 21 are sheet-shaped and stacked. Specifically, in some practical applications, the first power electrode main body 11 and the second power electrode main body 21 can be made of flat-extending sheet metal or bent-extending sheet metal, such as Figure 3 and Figure 4 As shown, both the first power electrode main body 11 and the second power electrode main body 21 are made of bent-extending sheet metal; a first insulating layer 40 is stacked between the first power electrode main body 11 and the second power electrode main body 21; specifically, in some practical applications, the first insulating layer 40 completely covers the stacked surfaces of the first power electrode main body 11 and the second power electrode main body 21 that face each other and extends to the outside of the edge of this stacked surface to provide an appropriate creepage distance according to actual needs. This can not only meet the insulation requirements between the first power electrode main body 11 and the second power electrode main body 21, but also greatly reduce the stacked interval between the first power electrode main body 11 and the second power electrode main body 21 to further reduce the parasitic inductance; in addition, according to actual needs, the first insulating layer 40 can also partially cover the above-mentioned stacked surface, but the first insulating layer 40 needs to have a sufficient thickness to increase the stacked interval between the first power electrode main body 11 and the second power electrode main body 21 and provide an appropriate creepage distance; both the second connection part 13 of the first power electrode and the second connection part 23 of the second power electrode are sheet-shaped and stacked. The second connection part 13 of the first power electrode extends from the first power electrode main body 11 to the outside of the power module, and the second connection part 23 of the second power electrode extends from the second power electrode main body 21 to the outside of the power module; such as Figure 3 As shown, specifically, in some practical applications, the first power electrode main body 11 and the second connection part 13 of the first power electrode are integrally formed on the same metal sheet, the second power electrode main body 21 and the second connection part 23 of the second power electrode are integrally formed on the same metal sheet, and the stacked interval between the second connection part 13 of the first power electrode and the second connection part 23 of the second power electrode is set as a accommodating space for accommodating external connection terminals, and the external connection terminals are respectively connected to the corresponding second connection part 13 of the first power electrode and the second connection part 23 of the second power electrode.

[0029] As a further improvement of the above technical solution, the second connection portion 13 of the first power electrode and the second connection portion 23 of the second power electrode diverge at the laminated end of the first power electrode body 11 and the second power electrode body 21 and then extend outward from the power module, so as to form a laminated interval adapted to the thickness of the external connection terminal between the second connection portion 13 of the first power electrode and the second connection portion 23 of the second power electrode. Specifically, in some practical applications, there are various choices for the divergence manner of the second connection portion 13 of the first power electrode and the second connection portion 23 of the second power electrode. In the embodiment shown in Figure 3 , a first bending portion 14 is provided between the first power electrode body 11 and the second connection portion 13 of the first power electrode to make the second connection portion 13 of the first power electrode away from the second connection portion 23 of the second power electrode in the lamination direction; or only between the second power electrode body 21 and the second connection portion 23 of the second power electrode, a second bending portion 24 can be provided to make the second connection portion 23 of the second power electrode away from the second connection portion 13 of the first power electrode in the lamination direction; or, as shown in Figure 9 , the above-mentioned first bending portion and second bending portion can be provided simultaneously.

[0030] As a further improvement of the above technical solution, as shown in Figure 4 , the second connection portion 13 of the first power electrode is provided with a first power electrode connection hole 131, and the second connection portion 23 of the second power electrode is provided with a second power electrode connection hole 231 whose position corresponds to the first power electrode connection hole 131. Specifically, in some practical applications, one or more first power electrode connection holes 131 and second power electrode connection holes 231 can be provided respectively. As shown in Figure 5 , two first power electrode connection holes 131 and second power electrode connection holes 231 can be provided respectively.

[0031] As a further refinement of the above technical solution, the power module further includes an insulating substrate 100, and a first bridge arm conductive layer 200, a second bridge arm conductive layer 300, an output electrode conductive layer 400, a first power electrode conductive layer 500, a second power electrode conductive layer 600 provided on the insulating substrate, a first bridge arm power chip 700 provided on the first bridge arm conductive layer, and a second bridge arm power chip 800 provided on the second bridge arm conductive layer; specifically, in some practical applications, the power module is specifically a half-bridge module mainly composed of an upper bridge arm power chip and the corresponding conductive layer of the upper bridge arm, and a lower bridge arm power chip and the corresponding conductive layer of the lower bridge arm. Figure 4 It is a product form in which three identical half-bridge modules are integrated together, as shown in Figure 4 and Figure 5As shown, the first arm conductive layer 200 is specifically the lower arm conductive layer, the second arm conductive layer 300 is the upper arm conductive layer, the first power electrode 10 is the negative electrode, the second power electrode 20 is the positive electrode, the first arm power chip 700 is the lower arm power chip, and the second arm power chip 800 is the upper arm power chip. The first arm power chip 700 and the second arm power chip 800 can use IGBTs or power MOSFETs. The first arm power chip 700 is electrically connected to the first power electrode 10 through the first power electrode conductive layer 500, and the first arm power chip 700 is electrically connected to the output electrode 30 through the output electrode conductive layer 400; the second arm power chip 800 is electrically connected to the second power electrode 20 through the second power electrode conductive layer 600, and the second arm power chip 800 is electrically connected to the output electrode 30 through the output electrode conductive layer 400; the first arm conductive layer 200 and the second arm conductive layer 300 are disposed on both sides of the upper surface of the insulating substrate 100, the first power electrode conductive layer 500 and the second power electrode conductive layer 600 are disposed between the first arm conductive layer 200 and the second arm conductive layer 300, the first power electrode conductive layer 500 is disposed close to the first arm power chip 700, the second power electrode conductive layer 600 is disposed close to the second arm power chip 800, the first connection portion 12 of the first power electrode is welded to the first power electrode conductive layer 500, and the first connection portion 22 of the second power electrode is welded to the second power electrode conductive layer 600.

[0032] As Figures 6 to 10As shown in the figure, an embodiment of the present invention further provides a power module, which includes the power module provided in any of the above technical solutions, a capacitor bank 70, a first capacitor lead electrode 50, and a second capacitor lead electrode 60. The first capacitor lead electrode 50 includes a first capacitor lead electrode body 51 and a first capacitor lead electrode connecting portion 52. The second capacitor lead electrode 60 includes a second capacitor lead electrode body 61 and a second capacitor lead electrode connecting portion 62. One end of the first capacitor lead electrode body 51 is electrically connected to the corresponding electrode of the capacitor bank. The second capacitor lead electrode body 61 is electrically connected to the corresponding electrode of the capacitor bank. The first capacitor lead electrode body 51 and the second capacitor lead electrode body 61 are both sheet-shaped and stacked. The first capacitor lead electrode connecting portion 52 is sheet-shaped and extends outward from the first capacitor lead electrode body 51. The second capacitor lead electrode connecting portion 62 is sheet-shaped and extends outward from the second capacitor lead electrode body 61. Specifically, in some practical applications, the first capacitor lead electrode 50 is connected to the negative electrode of the capacitor bank, and the second capacitor lead electrode 60 is connected to the positive electrode of the capacitor bank. The first capacitor lead electrode body 51 and the first capacitor lead electrode connecting portion 52 are integrally formed on the same metal sheet. The second capacitor lead electrode body 61 and the second capacitor lead electrode connecting portion 62 are integrally formed on the same metal sheet. The first capacitor lead electrode connecting portion 52 and the second capacitor lead electrode connecting portion 62 are stacked and inserted into the accommodation space. A second insulating layer 80 is provided between the first capacitor lead electrode connecting portion 52 and the second capacitor lead electrode connecting portion 62. Specifically, in some practical applications, the second insulating layer 80 completely covers the overlapping surfaces of the first capacitor lead electrode connecting portion 52 and the second capacitor lead electrode connecting portion 62 and extends to the outside of the edge of the overlapping surface to provide an appropriate creepage distance according to actual needs. In this way, it can not only meet the insulation requirements between the first capacitor lead electrode connecting portion 52 and the second capacitor lead electrode connecting portion 62, but also greatly reduce the stacking interval between the first capacitor lead electrode connecting portion and the second capacitor lead electrode connecting portion to further reduce the parasitic inductance. In addition, according to actual needs, the second insulating layer 80 can also partially cover the above overlapping surface, but the second insulating layer 80 needs to have a sufficient thickness to increase the stacking interval between the first capacitor lead electrode connecting portion 52 and the second capacitor lead electrode connecting portion 62 and provide an appropriate creepage distance. The first capacitor lead electrode connecting portion 52 is connected to the second connecting portion of the first power electrode 13, and the second capacitor lead electrode connecting portion 62 is connected to the second connecting portion of the second power electrode 23.

[0033] As a further improvement of the above technical solution, a third insulating layer 90 is provided between the first capacitor lead electrode body 51 and the second capacitor lead electrode body 61. Specifically, in some practical applications, the third insulating layer completely covers the overlapping surfaces of the first capacitor lead electrode body 51 and the second capacitor lead electrode body 61 that face each other, and extends to the outside of the edge of the overlapping surface. To provide an appropriate creepage distance according to actual needs. Specifically, in some practical applications, the second insulating layer 80 and the third insulating layer 90 are integrally formed on the same insulating material.

[0034] Specifically, in some practical applications, such as Figure 6 shown in the power module, the capacitor bank includes a plurality of capacitors, the plurality of capacitors are arranged between the first capacitor busbar 110 and the second capacitor busbar 120, the first capacitor lead electrode 50 is connected to the first capacitor busbar 110 through the first capacitor busbar connection part 111 provided on the side of the capacitor bank, and the second capacitor lead electrode 60 is connected to the first capacitor busbar 120 through the second capacitor busbar connection part 121 provided on the side of the capacitor bank; as Figure 9 shown, the capacitor bank can also be directly arranged on the PCB board, the first capacitor lead electrode body 51 and the first lead electrode connection part 52 are arranged on one surface of the PCB board, and the second capacitor lead electrode body 61 and the second capacitor lead electrode connection part 62 are arranged on the other surface of the PCB board.

[0035] As a further improvement of the above technical solution, in some practical applications, such as Figures 6 to 10 shown, the first capacitor lead electrode connection part 52 is provided with a first capacitor lead electrode connection hole 521 corresponding to the first power electrode connection hole 131, the second capacitor lead electrode connection part 62 is provided with a second capacitor lead electrode connection hole 621 corresponding to the second power electrode connection hole 231, an insulating pad 150 for clamping the bolt is provided above the second connection part 13 of the first power electrode, and a nut 160 is provided below the second connection part 23 of the second power electrode. The bolt 170 sequentially passes through the insulating pad 150, the first power electrode connection hole 131, the first capacitor lead electrode connection hole 521, the second insulating layer 80, the second capacitor lead electrode connection hole 621, the second power electrode connection hole 231 and is connected to the nut 160. The bolt 170 is insulated from the second connection part 13 of the first power electrode and the first capacitor lead electrode connection part 52. Specifically, in some practical applications, the second insulating layer 80 is provided with a second insulating layer connection hole 801 corresponding to the bolt 170, and the bolt 170 passes through the second insulating layer through the second insulating layer connection hole 801. The diameter of the second insulating layer connection hole 801 is smaller than that of the first capacitor lead electrode connection hole 521 and the second capacitor lead electrode connection hole 621 to provide an appropriate creepage distance. Specifically, in some practical applications, such as Figure 5 and Figure 10As shown, there are two each of the first power electrode connection holes, the second power electrode connection holes, the first capacitor lead-out electrode connection holes, the second capacitor lead-out electrode connection holes, the second insulating layer connection holes, the insulating pads, the nuts, and the bolts, and the corresponding positions and connection relationships are as described above. Specifically, in some practical applications, such as Figures 8 to 10 A power module as shown includes a plurality of power modules provided by any of the above technical solutions, as well as a capacitor bank 70, a first capacitor lead-out electrode 50, and a second capacitor lead-out electrode 60; the first capacitor lead-out electrode 50 includes a first capacitor lead-out electrode main body 51 and a first capacitor lead-out electrode connection portion 52, and the second capacitor lead-out electrode 60 includes a second capacitor lead-out electrode main body 61 and a second capacitor lead-out electrode connection portion 62; wherein, both the first capacitor lead-out electrode main body 51 and the second capacitor lead-out electrode main body 61 are strip-shaped metal sheets, and a plurality of first capacitor lead-out electrode connection portions 52 adapted to the number of the plurality of power modules extend integrally from the first capacitor lead-out electrode main body 51, and a plurality of first capacitor lead-out electrode connection portions 62 adapted to the number of the plurality of power modules extend integrally from the first capacitor lead-out electrode main body 61. Specifically, the lead-out shapes of the first capacitor lead-out electrode connection portion 52 and the second capacitor lead-out electrode connection portion 62 can be as Figure 10 shown as a regular overall extension, so that the plurality of first capacitor lead-out electrode connection portions 52 are connected into one body, and the plurality of second capacitor lead-out electrodes 62 are connected into one body; according to actual requirements, the lead-out shapes of the first capacitor lead-out electrode connection portion 52 and the second capacitor lead-out electrode 62 can be as Figure 8 shown as an irregular extension, so that the plurality of first capacitor lead-out electrode connection portions 52 are separated from each other, and the plurality of second capacitor lead-out electrode connection portions 62 are separated from each other; the plurality of first capacitor lead-out electrode connection portions 52 and the plurality of second lead-out electrode connection portions 62 are stacked and then inserted side by side into the corresponding accommodation spaces of the plurality of power modules. It is convenient to obtain a relatively ideal electrode stacking area as a whole, which helps to reduce the parasitic inductance of the entire module.

[0036] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A fast power module, characterized in that: Including a first power electrode, a second power electrode, and an output electrode for conducting current to a power module; the first power electrode includes a first power electrode main body, a first connection portion of the first power electrode, and a second connection portion of the first power electrode, the second power electrode includes a second power electrode main body, a first connection portion of the second power electrode, and a second connection portion of the second power electrode, the first power electrode main body is connected to a corresponding conductive layer inside the power module through the first connection portion of the first power electrode, the second power electrode main body is connected to a corresponding conductive layer inside the power module through the first connection portion of the second power electrode, both the first power electrode main body and the second power electrode main body are sheet-shaped and are stacked, and a first insulating layer is stacked between the first power electrode main body and the second power electrode main body; the first insulating layer completely covers the stacked surfaces of the first power electrode main body and the second power electrode main body that face each other, and extends outside the edges of the stacked surfaces; both the second connection portion of the first power electrode and the second connection portion of the second power electrode are sheet-shaped and are stacked, the second connection portion of the first power electrode extends from the first power electrode main body to the outside of the power module, the second connection portion of the second power electrode extends from the second power electrode main body to the outside of the power module, and the stacked interval between the second connection portion of the first power electrode and the second connection portion of the second power electrode is set as a receiving space for receiving external connection terminals, and the external connection terminals are respectively connected to the corresponding second connection portion of the first power electrode and the second connection portion of the second power electrode; the second connection portion of the first power electrode and the second connection portion of the second power electrode extend to the outside of the power module after diverging at the stacked ends of the first power electrode main body and the second power electrode main body, so as to form a stacked interval adapted to the thickness of the external connection terminals between the second connection portion of the first power electrode and the second connection portion of the second power electrode.

2. The power module according to claim 1, characterized in that: The second connection portion of the first power electrode is provided with a connection hole of the first power electrode, and the second connection portion of the second power electrode is provided with a connection hole of the second power electrode whose position corresponds to that of the connection hole of the first power electrode.

3. The power module according to claim 1, wherein: It further includes an insulating substrate, and a first arm conductive layer, a second arm conductive layer, an output electrode conductive layer, a first power electrode conductive layer, a second power electrode conductive layer provided on the insulating substrate, a first arm power chip provided on the first arm conductive layer, and a second arm power chip provided on the second arm conductive layer; the first arm power chip is electrically connected to the first power electrode through the first power electrode conductive layer, and the first arm power chip is electrically connected to the output electrode through the output electrode conductive layer; the second arm power chip is electrically connected to the second power electrode through the second power electrode conductive layer, and the second arm power chip is electrically connected to the output electrode through the output electrode conductive layer; the first arm conductive layer and the second arm conductive layer are arranged on both sides of the upper surface of the insulating substrate, the first power electrode conductive layer and the second power electrode conductive layer are arranged between the first arm conductive layer and the second arm conductive layer, the first connection portion of the first power electrode is welded to the first power electrode conductive layer, and the first connection portion of the second power electrode is welded to the second power electrode conductive layer.

4. A power module, characterized in that: Comprising the power module according to any one of claims 1 to 3, a capacitor bank, a first capacitor lead electrode, and a second capacitor lead electrode. The first capacitor lead electrode includes a first capacitor lead electrode body and a first capacitor lead electrode connecting portion. The second capacitor lead electrode includes a second capacitor lead electrode body and a second capacitor lead electrode connecting portion. One end of the first capacitor lead electrode body is electrically connected to the corresponding electrode of the capacitor bank. The second capacitor lead electrode body is electrically connected to the corresponding electrode of the capacitor bank. The first capacitor lead electrode body and the second capacitor lead electrode body are both sheet-shaped and are arranged in a stacked manner. The first capacitor lead electrode connecting portion is sheet-shaped and extends outward from the first capacitor lead electrode body. The second capacitor lead electrode connecting portion is sheet-shaped and extends outward from the second capacitor lead electrode body. The first capacitor lead electrode connecting portion and the second capacitor lead electrode connecting portion are arranged in a stacked manner and are inserted into the accommodating space. A second insulating layer is provided between the first capacitor lead electrode connecting portion and the second capacitor lead electrode connecting portion. The first capacitor lead electrode connecting portion is connected to the second connecting portion of the first power electrode. The second capacitor lead electrode connecting portion is connected to the second connecting portion of the second power electrode.

5. The power module according to claim 4, wherein: The second insulating layer completely covers the stacked surfaces of the first capacitor lead electrode connecting portion and the second capacitor lead electrode connecting portion that face each other and extends to the outside of the edge of the stacked surface.

6. The power module according to claim 4, wherein: A third insulating layer is provided between the first capacitor lead electrode body and the second capacitor lead electrode body.

7. The power module according to claim 6, wherein: The third insulating layer completely covers the stacked surfaces of the first capacitor lead electrode body and the second capacitor lead electrode body that face each other and extends to the outside of the edge of the stacked surface.

8. The power module according to claim 4, wherein: The first capacitor lead electrode connecting portion is provided with a first capacitor lead electrode connecting hole corresponding to the first power electrode connecting hole. The second capacitor lead electrode connecting portion is provided with a second capacitor lead electrode connecting hole corresponding to the second power electrode connecting hole. An insulating pad is provided above the second connecting portion of the first power electrode. A nut is provided below the second connecting portion of the second power electrode. A bolt sequentially passes through the insulating pad, the first power electrode connecting hole, the first capacitor lead electrode connecting hole, the second insulating layer, the second capacitor lead electrode connecting hole, the second power electrode connecting hole and is connected to the nut. The bolt is insulated from the second connecting portion of the first power electrode and the first capacitor lead electrode connecting portion.

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