Power module unit and motor controller

Abstract

The utility model relates to a power module unit and a motor controller. The power module unit comprises a power module, a capacitor and a busbar. The power module comprises a plurality of first wiring terminals and a plurality of second wiring terminals; the capacitor is arranged on one side, far away from the second wiring terminal, of the first wiring terminal; the plurality of first wiring terminals comprise a plurality of first positive wiring terminals and a plurality of first negative wiring terminals which are arranged at intervals, and the capacitor comprises a plurality of first electrodes which are in one-to-one correspondence with the plurality of first positive wiring terminals and a plurality of second electrodes which are in one-to-one correspondence with the plurality of first negative wiring terminals; the first electrodes are welded with the corresponding first positive wiring terminals; and the second electrodes are welded with the corresponding first negative wiring terminals. The busbar is arranged on one side, far away from the first wiring terminal, of the second wiring terminal; and the plurality of second wiring terminals are respectively welded on the busbar. Therefore, the occupied space of the power module can be saved, the occupied space of the motor controller is further reduced, and the tedious operation of screw locking can be omitted.

Description

Technical Field

[0001] The present application relates to the technical field of power modules, and in particular to a power module unit and a motor controller. Background Art

[0002] The motor controller usually includes capacitors, busbars and power modules. The assembly of the motor controller includes the process of integrating the capacitors, busbars and power modules. However, the traditional motor controller has the problem of cumbersome assembly steps and large space occupation. Utility Model Content

[0003] Based on this, it is necessary to provide a power module unit and a motor controller to address the problems of traditional motor controllers having complicated assembly steps and occupying a large space.

[0004] According to a first aspect of the present application, a power module unit is provided, the power module unit comprising:

[0005] A power module, comprising a plurality of first wiring terminals and a plurality of second wiring terminals; the first wiring terminals correspond to the second wiring terminals one by one, and the first wiring terminals are opposite to the corresponding second wiring terminals and are arranged at intervals;

[0006] A capacitor is provided on a side of the first wiring terminal away from the second wiring terminal; the plurality of first wiring terminals include a plurality of first positive wiring terminals and a plurality of first negative wiring terminals arranged at intervals; the capacitor includes a plurality of first electrodes corresponding to the plurality of first positive wiring terminals one by one, and a plurality of second electrodes corresponding to the plurality of first negative wiring terminals one by one, the first electrodes are welded to the corresponding first positive wiring terminals; the second electrodes are welded to the corresponding first negative wiring terminals;

[0007] A busbar is arranged on a side of the second wiring terminal away from the first wiring terminal; a plurality of the second wiring terminals are respectively welded to the busbar.

[0008] In one embodiment, the power module unit further includes a plurality of first welding portions corresponding to the plurality of first connecting terminals and the plurality of second connecting terminals respectively;

[0009] The first welding portion includes a first sub-welding portion and a second sub-welding portion arranged in the same layer and spaced apart from each other, the first electrode is welded to the corresponding first positive electrode terminal through a corresponding one of the first sub-welding portions; the second electrode is welded to the corresponding first negative electrode terminal through another corresponding one of the first sub-welding portions;

[0010] The second connecting terminal is welded to the busbar through the corresponding second sub-welding portion.

[0011] In one embodiment, the first connecting terminal and the corresponding second connecting terminal are spaced apart along a first direction;

[0012] The first positive electrode terminal and the first negative electrode terminal are arranged at intervals along the second direction;

[0013] The first direction and the second direction are perpendicular to each other, and are both perpendicular to a thickness direction of the power module.

[0014] In one embodiment, the first electrode and the corresponding first positive electrode terminal are defined as a first electrode assembly, and the second electrode and the corresponding first negative electrode terminal are defined as a second electrode assembly;

[0015] The power module unit further includes a plurality of insulating members corresponding to the first electrode assemblies, the insulating members being used to electrically isolate the corresponding first electrode assemblies from the corresponding second electrode assemblies.

[0016] In one of the embodiments, the power module unit further includes a plurality of adapters corresponding to the second electrode assembly, and the second electrode is welded to the corresponding first negative electrode terminal through the corresponding adapters.

[0017] In one of the embodiments, the first electrode assembly, the corresponding insulating member and the corresponding transition member are stacked along the thickness direction of the power module.

[0018] In one embodiment, along a direction parallel to the first wiring terminal pointing to the corresponding second wiring terminal, the second electrode and the corresponding first negative wiring terminal are arranged on opposite sides of the adjacent first positive wiring terminal;

[0019] The adapter comprises a first part and a second part arranged at intervals along a direction from the first connecting terminal to the corresponding second connecting terminal, and a third part located between the first part and the second part;

[0020] The first portion covers and is welded to the second electrode, the second portion covers and is welded to the corresponding first negative electrode terminal, and the third portion covers the corresponding insulating member.

[0021] In one embodiment, the power module unit further includes a plurality of second welding portions corresponding to the plurality of first electrodes, and a plurality of third welding portions corresponding to the plurality of second electrodes;

[0022] The first electrode is welded to the corresponding first positive electrode terminal through the corresponding second welding portion;

[0023] The second electrode is welded to the corresponding first negative electrode terminal through the corresponding adapter and the corresponding third welding portion.

[0024] In one embodiment, the third welding portion includes a third sub-welding portion and a fourth sub-welding portion which are arranged in the same layer and spaced apart from each other;

[0025] The first portion is welded to the corresponding second electrode through the corresponding third sub-welding portion, and the second portion is welded to the corresponding first negative electrode terminal through the corresponding fourth sub-welding portion;

[0026] Along a direction parallel to the first connecting terminal and pointing toward the corresponding second connecting terminal, the third sub-welding portion and the fourth sub-welding portion are located on opposite sides of the adjacent second welding portion.

[0027] According to a second aspect of the present application, a motor controller is provided, comprising a power module unit according to any one of the above embodiments.

[0028] In the technical solution of the present application, since the first electrode is welded to the corresponding first positive terminal, the second electrode is welded to the corresponding first negative terminal, and a plurality of the second terminals are welded to the busbar, respectively, the method of screwing the power module to the busbar and the capacitor can be abandoned, so that the first terminal and the second terminal do not need to extend out of the housing because there is no need to open a screw interface, which can save the space occupied by the power module, thereby reducing the space occupied by the motor controller. In addition, the method of simultaneous multi-point welding can be used to improve the assembly efficiency of the motor controller, eliminating the tedious work of screwing. The use of laser welding can also make the terminal not need additional creepage distance around the bolt, which provides a smaller contact resistance and reliable connection for the first terminal, and also provides a smaller contact resistance and reliable connection for the second terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a power module unit in an embodiment of the present application is shown.

[0030] Figure 2 A schematic structural diagram of a power module unit in another embodiment of the present application is shown.

[0031] Figure 3(a)-Figure 3(d) Shows Figure 1 A schematic diagram of the assembly process of the power module unit in the illustrated embodiment.

[0032] Figure 4(a)-Figure 4(e) Shows Figure 2A schematic diagram of the assembly process of the power module unit in the illustrated embodiment.

[0033] Figure 5 A top view of FIG4( b ) is shown.

[0034] Reference numerals: 10, power module unit; 110, power module; 111, first terminal; 1111, first positive terminal; 1112, first negative terminal; 112, second terminal; 120, capacitor; 121, first electrode; 122, second electrode; 130, busbar; 131, busbar terminal; 140, insulating member; 150, adapter; 151, first part; 152, second part; 153, third part; 113, first welding portion; 1131, first sub-welding portion; 1132, second sub-welding portion; 114, second welding portion;

[0035] 115, third welding part; 1151, third sub-welding part; 1152, fourth sub-welding part; 116, fourth welding part. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0042] After research, it was found that due to the limited space of the power module itself, the screw interfaces for locking the power module with the busbar and the capacitor cannot be arranged in the housing of the power module. The wiring terminals of the power module are led out of the housing, and screw interfaces are opened on the wiring terminals of the power module. Ultimately, more space needs to be reserved for the motor controller, which also causes the motor controller to occupy a larger space. In addition, the wiring terminals of the power module need to be screwed to the busbar and the capacitor respectively, which makes the assembly steps of the motor controller more cumbersome.

[0043] In order to solve at least one of the above technical problems, the present application designs a power module unit, which can reduce the occupied space of the motor controller and improve the assembly efficiency of the motor controller.

[0044] Figure 1 FIG. 1 shows a schematic diagram of the structure of a power module unit 10 in an embodiment of the present application. Figure 2 A schematic structural diagram of a power module unit 10 in another embodiment of the present application is shown.

[0045] See also Figure 1 and Figure 2 An embodiment of the present application provides a power module unit 10, including a power module 110, a capacitor 120 and a busbar 130.

[0046] The power module 110 includes a plurality of first wiring terminals 111 and a plurality of second wiring terminals 112, wherein the first wiring terminals 111 correspond to the second wiring terminals 112 one by one, and the first wiring terminals 111 are opposite to and spaced from the corresponding second wiring terminals 112. The capacitor 120 is disposed on a side of the first wiring terminal 111 away from the second wiring terminal 112, and the busbar 130 is disposed on a side of the second wiring terminal 112 away from the first wiring terminal 111, so that it is convenient to weld the first wiring terminal 111 to the capacitor 120, and it is also convenient to weld the second wiring terminal 112 to the busbar 130, and it is convenient to assemble the power module 110, the capacitor 120 and the busbar 130 by welding.

[0047] Specifically, the first wiring terminal 111 is a DC terminal, and the second wiring terminal 112 is an AC terminal.

[0048] Optionally, the busbar 130 is a three-phase copper busbar, and three busbar terminals 131 are arranged on the busbar 130 , and the three busbar terminals 131 are respectively a U-phase terminal, a V-phase terminal, and a W-phase terminal.

[0049] The multiple first terminals 111 include multiple first positive terminals 1111 and multiple first negative terminals 1112 that are arranged at intervals. The capacitor 120 includes multiple first electrodes 121 corresponding one-to-one to the multiple first positive terminals 1111, and multiple second electrodes 122 corresponding one-to-one to the multiple first negative terminals 1112. The first electrodes 121 are welded to the corresponding first positive terminals 1111; the second electrodes 122 are welded to the corresponding first negative terminals 1112.

[0050] Since the first electrode 121 is welded to the corresponding first positive terminal 1111, the second electrode 122 is welded to the corresponding first negative terminal 1112, and the plurality of second terminals 112 are welded to the busbar 130, respectively, the screw locking method of the power module 110 to the busbar 130 and the capacitor 120 can be abandoned, so that the first terminal 111 and the second terminal 112 do not need to extend out of the housing because there is no need to open a screw interface, which can save the space occupied by the power module 110, thereby reducing the space occupied by the motor controller. In addition, the assembly efficiency of the motor controller can be improved by using a multi-point simultaneous welding method (for example, a plurality of second terminals 112 can be welded to the busbar 130 at the same time), eliminating the tedious work of screw locking. The laser welding method can also make the terminal not need to have an additional creepage distance around the bolt, which provides a smaller contact resistance and a reliable connection for the first terminal 111, and also provides a smaller contact resistance and a reliable connection for the second terminal 112.

[0051] In some embodiments, see Figure 1 and Figure 3(a)-Figure 3(d) The power module unit 10 also includes a plurality of first welding portions 113 corresponding to the plurality of first terminals 111 and the plurality of second terminals 112 respectively. The first welding portion 113 includes a first sub-welding portion 1131 and a second sub-welding portion 1132 arranged in the same layer and spaced apart from each other. The first electrode 121 is welded to the corresponding first positive terminal 1111 through a corresponding first sub-welding portion 1131, the second electrode 122 is welded to the corresponding first negative terminal 1112 through another corresponding first sub-welding portion 1131, and the second terminal 112 is welded to the busbar 130 through the corresponding second sub-welding portion 1132.

[0052] Specifically, the busbar terminal 131 of the busbar 130 is electrically connected to the corresponding second connection terminal 112 through the corresponding second sub-welding portion 1132 .

[0053] Since the first sub-welding portion 1131 and the second sub-welding portion 1132 are arranged in the same layer and are spaced apart from each other, on the one hand, the first electrode 121 can be welded to the corresponding first positive terminal 1111 through the corresponding first sub-welding portion 1131, the second electrode 122 can be welded to the corresponding first negative terminal 1112 through the corresponding other first sub-welding portion 1131, and the second terminal 112 can be welded to the busbar 130 through the corresponding second sub-welding portion 1132; and the first sub-welding portion 1131 and the second sub-welding portion 1132 arranged at intervals can improve the assembly reliability of the power module unit 10. On the other hand, the first sub-welding portion 1131 and the second sub-welding portion 1132 are arranged in the same layer, that is, the first sub-welding portion 1131 and the second sub-welding portion 1132 are formed in the same welding process, which is beneficial to improving the assembly efficiency of the power module unit 10 and also beneficial to improving the assembly efficiency of the motor controller.

[0054] Laser welding can be used to weld the first electrode 121 to the corresponding first positive terminal 1111 through a corresponding first sub-welding portion 1131, the second electrode 122 to the corresponding first negative terminal 1112 through another corresponding first sub-welding portion 1131, and the second terminal 112 to the busbar 130 through the corresponding second sub-welding portion 1132.

[0055] Compared with the screw locking method, the laser welding process of the present application has the characteristics of fast process time, low contact resistance, no need for surface treatment of the busbar 130, and the power module unit 10 having a minimum vertical space, which is conducive to using the power module unit 10 to manufacture a smaller and better-performing silicon carbide power semiconductor module.

[0056] In some embodiments, the first connection terminal 111 and the corresponding second connection terminal 112 are arranged along the first direction F 1 The first positive electrode terminal 1111 and the first negative electrode terminal 1112 are arranged at intervals along the second direction F 2 Interval layout, first direction F 1 With the second direction F 2 They are perpendicular to each other and are perpendicular to the thickness direction of the power module 110 .

[0057] For example, the first direction F 1 The second direction F is parallel to the width direction of the power module 110. 2 Parallel to the length direction of the power module 110 .

[0058] In this way, it is convenient to weld the first electrode 121 with the corresponding first positive terminal 1111 , and it is also convenient to weld the second electrode 122 with the corresponding first negative terminal 1112 , and it is also convenient to weld the second terminal 112 to the busbar 130 .

[0059] In this embodiment, Figure 1 As shown, the positions marked ①-⑥ are the welding areas of the first positive electrode terminal 1111 (DC+ terminal), the positions marked ⑦-⑨ are the welding areas of the first negative electrode terminal 1112 (DC- terminal), and the positions marked All of them are welding areas of the second connecting terminal 112.

[0060] In some other embodiments, see Figure 2 and Figure 4(a)-Figure 4(e) , defining the first electrode 121 and the corresponding first positive terminal 1111 as a first electrode assembly, defining the second electrode 122 and the corresponding first negative terminal 1112 as a second electrode assembly, the power module unit 10 also includes a plurality of insulating members 140 corresponding to the first electrode assembly, and the insulating members 140 are used to electrically isolate the corresponding first electrode assembly from the corresponding second electrode assembly.

[0061] The use of an insulating member 140 to electrically isolate the first electrode assembly from the corresponding second electrode assembly can improve the reliability of the electrical connection between the first electrode 121 in the first electrode assembly and the corresponding first positive terminal 1111, and the electrical connection between the second electrode 122 in the corresponding second electrode assembly and the corresponding first negative terminal 1112, thereby reducing the probability of a short circuit.

[0062] In some embodiments, the power module unit 10 further includes a plurality of adapters 150 corresponding to the second electrode assembly, and the second electrode 122 is welded to the corresponding first negative electrode terminal 1112 through the corresponding adapters 150 .

[0063] The second electrode 122 is electrically connected to the corresponding first negative electrode terminal 1112 through the corresponding adapter 150 , which is beneficial to improving the current capacity of the power module unit 10 .

[0064] In some embodiments, the first electrode assembly, the corresponding insulating member 140 , and the corresponding transition member 150 are stacked along the thickness direction of the power module 110 .

[0065] In this way, while the first electrode assembly and the corresponding second electrode assembly are electrically isolated, the second electrode 122 and the corresponding adapter 150, as well as the adapter 150 and the corresponding first negative terminal 1112 can be stacked separately, thereby reducing the loop distance from the power module 110 to the capacitor 120, greatly reducing the system stray inductance, and improving the overcurrent capacity of the power module 110, which is beneficial to improving the performance of the silicon carbide power semiconductor module.

[0066] In some embodiments, the second electrode 122 and the corresponding first negative terminal 1112 are arranged on opposite sides of the adjacent first positive terminal 1111 along a direction parallel to the first terminal 111 pointing to the corresponding second terminal 112, and the adapter 150 includes a first part 151 and a second part 152 arranged at intervals along the direction of the first terminal 111 pointing to the corresponding second terminal 112, and a third part 153 located between the first part 151 and the second part 152, the first part 151 covers and is welded to the second electrode 122, the second part 152 covers and is welded to the corresponding first negative terminal 1112, and the third part 153 covers the corresponding insulating member 140.

[0067] On the one hand, the third part 153 of the adapter 150 covers the corresponding insulating part 140, and the insulating part 140 can be well utilized to electrically isolate the first electrode assembly from the corresponding second electrode assembly; on the other hand, the first part 151 covers and is welded to the second electrode 122, and the second part 152 covers and is welded to the corresponding first negative terminal 1112. In this way, it is more convenient to use the larger area of ​​the adapter 150 to respectively weld the second electrode 122 and the corresponding first negative terminal 1112, so that the second electrode 122 and the corresponding first negative terminal 1112 can be welded together, and the current capacity of the power module unit 10 can be improved.

[0068] In some embodiments, the power module unit 10 further includes a plurality of second welding portions 114 corresponding to the plurality of first electrodes 121, and a plurality of third welding portions 115 corresponding to the plurality of second electrodes 122, and the first electrode 121 is welded to the corresponding first positive electrode terminal 1111 through the corresponding second welding portion 114 (see FIG. 4 (a), FIG. 4 (b) and FIG. 4 (c)). Figure 5 The second electrode 122 is welded to the corresponding first negative electrode terminal 1112 through the corresponding adapter 150 and the corresponding third welding portion 115 (which can be combined with Figure 2 and Figure 4(d)).

[0069] Specifically, the third welding portion 115 includes a third sub-welding portion 1151 and a fourth sub-welding portion 1152 which are arranged in the same layer and spaced apart from each other. The first portion 151 is welded to the corresponding second electrode 122 through the corresponding third sub-welding portion 1151, and the second portion 152 is welded to the corresponding first negative electrode terminal 1112 through the corresponding fourth sub-welding portion 1152. Along a direction parallel to the first terminal 111 pointing to the corresponding second terminal 112, the third sub-welding portion 1151 and the fourth sub-welding portion 1152 are located on opposite sides of the adjacent second welding portion 114.

[0070] Specifically, the power module unit 10 further includes a plurality of fourth welding portions 116 corresponding to the plurality of second connecting terminals 112 , and the second connecting terminals 112 are welded to the corresponding busbar terminals 131 through the corresponding fourth welding portions 116 .

[0071] In this way, it is convenient to weld the first part 151 to the corresponding second electrode 122 through the corresponding third sub-welding portion 1151, and weld the second part 152 to the corresponding first negative terminal 1112 through the corresponding fourth sub-welding portion 1152 in the same process, so as to realize welding between the second electrode 122 and the corresponding first negative terminal 1112.

[0072] In this embodiment, Figure 5 As shown in FIG. 1 , the positions marked ①-③ are all welding areas of the first positive electrode terminal 1111 (DC+ terminal). Figure 2 As shown, the positions marked ④-⑥ are welding areas between the adapter 150 and the first negative terminal 1112 (DC-terminal), the positions marked ⑦-⑨ are welding areas between the adapter 150 and the second electrode 122 of the capacitor 120, and the positions marked ⑦-⑨ are welding areas between the adapter 150 and the second electrode 122 of the capacitor 120. All of them are welding areas of the second connecting terminal 112.

[0073] An embodiment of the present application further provides a motor controller, comprising the power module unit 10 of any of the above embodiments.

[0074] In the power module unit 10 of the present application, while the first electrode assembly and the corresponding second electrode assembly are electrically isolated, the second electrode 122 and the corresponding adapter 150, as well as the adapter 150 and the corresponding first negative terminal 1112 can be stacked separately, thereby reducing the loop distance from the power module 110 to the capacitor 120, greatly reducing the system stray inductance, improving the module's overcurrent capacity, and helping to improve the performance of the silicon carbide power semiconductor module.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A power module unit, characterized in that: The power module unit comprises: A power module, comprising a plurality of first wiring terminals and a plurality of second wiring terminals; the first wiring terminals correspond to the second wiring terminals one by one, and the first wiring terminals are opposite to the corresponding second wiring terminals and are arranged at intervals; A capacitor is provided on a side of the first wiring terminal away from the second wiring terminal; the plurality of first wiring terminals include a plurality of first positive wiring terminals and a plurality of first negative wiring terminals arranged at intervals; the capacitor includes a plurality of first electrodes corresponding to the plurality of first positive wiring terminals one by one, and a plurality of second electrodes corresponding to the plurality of first negative wiring terminals one by one, the first electrodes are welded to the corresponding first positive wiring terminals; the second electrodes are welded to the corresponding first negative wiring terminals; A busbar is arranged on a side of the second wiring terminal away from the first wiring terminal; a plurality of the second wiring terminals are respectively welded to the busbar.

2. The power module unit according to claim 1, characterized in that: The power module unit further includes a plurality of first welding portions corresponding to the plurality of first connecting terminals and the plurality of second connecting terminals respectively; The first welding portion includes a first sub-welding portion and a second sub-welding portion arranged in the same layer and spaced apart from each other, the first electrode is welded to the corresponding first positive electrode terminal through a corresponding one of the first sub-welding portions; the second electrode is welded to the corresponding first negative electrode terminal through another corresponding one of the first sub-welding portions; The second connecting terminal is welded to the busbar through the corresponding second sub-welding portion.

3. The power module unit according to claim 1 or 2, characterized in that: The first connecting terminal and the corresponding second connecting terminal are arranged at intervals along a first direction; The first positive electrode terminal and the first negative electrode terminal are arranged at intervals along the second direction; The first direction and the second direction are perpendicular to each other, and are both perpendicular to a thickness direction of the power module.

4. The power module unit according to claim 1, characterized in that: The first electrode and the corresponding first positive electrode terminal are defined as a first electrode assembly, and the second electrode and the corresponding first negative electrode terminal are defined as a second electrode assembly; The power module unit further includes a plurality of insulating members corresponding to the first electrode assemblies, the insulating members being used to electrically isolate the corresponding first electrode assemblies from the corresponding second electrode assemblies.

5. The power module unit according to claim 4, characterized in that: The power module unit further includes a plurality of adapters corresponding to the second electrode assembly, and the second electrode is welded to the corresponding first negative electrode terminal through the corresponding adapters.

6. The power module unit according to claim 5, characterized in that: The first electrode assembly, the corresponding insulating member and the corresponding transition member are stacked along a thickness direction of the power module.

7. The power module unit according to claim 6, characterized in that: Along a direction parallel to the first wiring terminal pointing to the corresponding second wiring terminal, the second electrode and the corresponding first negative wiring terminal are arranged on opposite sides of the adjacent first positive wiring terminal; The adapter comprises a first part and a second part arranged at intervals along a direction from the first connecting terminal to the corresponding second connecting terminal, and a third part located between the first part and the second part; The first portion covers and is welded to the second electrode, the second portion covers and is welded to the corresponding first negative electrode terminal, and the third portion covers the corresponding insulating member.

8. The power module unit according to claim 7, characterized in that: The power module unit further includes a plurality of second welding portions corresponding to the plurality of first electrodes, and a plurality of third welding portions corresponding to the plurality of second electrodes; The first electrode is welded to the corresponding first positive electrode terminal through the corresponding second welding portion; The second electrode is welded to the corresponding first negative electrode terminal through the corresponding adapter and the corresponding third welding portion.

9. The power module unit according to claim 8, characterized in that: The third welding portion includes a third sub-welding portion and a fourth sub-welding portion which are arranged in the same layer and spaced apart from each other; The first portion is welded to the corresponding second electrode through the corresponding third sub-welding portion, and the second portion is welded to the corresponding first negative electrode terminal through the corresponding fourth sub-welding portion; Along a direction parallel to the first connecting terminal and pointing toward the corresponding second connecting terminal, the third sub-welding portion and the fourth sub-welding portion are located on opposite sides of the adjacent second welding portion.

10. A motor controller, characterized in that: Comprising a power module unit as described in any one of claims 1-9.

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