Power module terminal and power module

Abstract

The invention provides a power module terminal and a power module, and relates to the technical field of semiconductors, and the power module terminal comprises a main terminal, a first extension terminal and a second extension terminal. Wherein the main terminal comprises an inner connecting part, a middle part and an outer connecting part which are connected in sequence. The inner connecting part, the outer connecting part, the first extension terminal and the second extension terminal are all made of the same conductive material, and the middle part is made of a high-resistance alloy material with known resistance. The inner end of the first extension terminal is connected with the outer connecting part, and the outer end of the first extension terminal is used for outputting first voltage of one end, close to the outer connecting part, of the middle part. The inner end of the second extension terminal is connected with the power module body or the inner connecting part, and the outer end of the second extension terminal is used for outputting a second voltage of one end, close to the inner connecting part, of the middle part. When the power module terminal is in a working state, current flows from the inner connecting part to the outer connecting part. The power module terminal can accurately detect the current value on the basis of reducing the cost.

Description

Technical Field

[0001] The present application relates to the field of semiconductor technology, and in particular to a power module terminal and a power module. Background Art

[0002] When the power module is in operation, it is necessary to detect the current output by the power module through the power terminals in real time. Currently, most magnetic induction modules are installed between the power terminals and the cable. The magnetic field generated by the current passing through the module is used as the detection target, and the magnetic field induction principle is used to detect the current at the power terminals.

[0003] However, this approach has the following problems: (1) Using a second module (i.e., the magnetic sensing module) to detect the current output by the first module (i.e., the power module) inevitably increases costs. (2) To accommodate the magnetic sensing module, the power terminals need to be lengthened. However, lengthening the power terminals increases parasitic inductance, causing interference and energy loss, and affecting the accuracy of current detection.

[0004] In summary, how to accurately detect the current at the power module terminals while reducing costs is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present application is to provide a power module terminal and a power module, so as to accurately detect the current of the power module terminal while reducing costs.

[0006] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0007] In one aspect, the present application provides a power module terminal, comprising: a main terminal, a first extension terminal, and a second extension terminal;

[0008] The main terminal includes an inner connecting portion, an intermediate portion, and an outer connecting portion connected in sequence; the inner connecting portion is also connected to the power module body, and the outer connecting portion is also connected to an external device, and the main terminal is used to achieve electrical connection between the power module body and the external device;

[0009] The inner connecting portion, the outer connecting portion, the first extension terminal and the second extension terminal are all made of the same conductive material, and the middle portion is made of a high-resistance alloy material with a known resistance value;

[0010] The inner end of the first extension terminal is connected to the external connection portion, and the outer end of the first extension terminal is used to output a first voltage; wherein the first voltage is the voltage of one end of the middle portion close to the external connection portion;

[0011] The inner end of the second extension terminal is connected to the power module body or the inner connection portion, and the outer end of the second extension terminal is used to output a second voltage; wherein the second voltage is the voltage of one end of the middle portion close to the inner connection portion;

[0012] When the power module terminal is in an operating state, current flows from the inner connection portion to the outer connection portion.

[0013] Furthermore, the inner connecting portion, the outer connecting portion, the first extending terminal and the second extending terminal are all made of metal copper;

[0014] The resistance of the inner connecting portion=the resistance of the outer connecting portion=the resistance of the first extending terminal=the resistance of the second extending terminal=R1, the resistance of the middle portion=R2, and R2>R1.

[0015] Furthermore, the resistance difference ΔR=R2-R1, when 0<ΔR≤preset resistance threshold, the inner end of the first extension terminal is connected to the side of the external connection part close to the middle part, and the inner end of the second extension terminal is connected to the power module body or the side of the internal connection part close to the middle part.

[0016] Furthermore, the inner end of the second extension terminal is connected to the power module body, and the first extension terminal includes a first horizontal terminal and a first vertical terminal;

[0017] One end of the first horizontal terminal is vertically connected to the external connection portion, and the other end of the first horizontal terminal is vertically connected to the first vertical terminal; the main terminal, the first vertical terminal and the second extension terminal are parallel to each other.

[0018] Furthermore, the inner end of the second extension terminal is connected to the inner connecting portion, the first extension terminal includes a first horizontal terminal and a first vertical terminal, and the second extension terminal includes a second horizontal terminal and a second vertical terminal; the length of the second horizontal terminal is greater than that of the first horizontal terminal, and the length of the second vertical terminal is greater than that of the first vertical terminal;

[0019] One end of the first horizontal terminal is vertically connected to the external connection part, and the other end of the first horizontal terminal is vertically connected to the first vertical terminal; one end of the second horizontal terminal is vertically connected to the internal connection part, and the other end of the second horizontal terminal is vertically connected to the second vertical terminal; the main terminal, the first vertical terminal and the second vertical terminal are parallel to each other, and the first horizontal terminal and the second horizontal terminal are parallel to each other.

[0020] Furthermore, the inner end of the second extension terminal is connected to the inner connecting portion; the main terminal, the first extension terminal and the second extension terminal are all made of the high-resistance alloy material with a known resistance value, and the main terminal, the first extension terminal and the second extension terminal are integrally formed.

[0021] Furthermore, the composition and weight ratio of the high resistance alloy material are: 39.2-55.3% copper, 14.7-54.8% nickel, and 0-15.1% manganese, and the resistance temperature coefficient of the high resistance alloy material is less than 20 ppm / °C.

[0022] Furthermore, the width of the first extension terminal and the width of the second extension terminal are both smaller than the width of the main terminal.

[0023] Furthermore, one end of the external connection portion away from the middle portion, the outer end of the first extension terminal, and the outer end of the second extension terminal are all located on the same horizontal straight line.

[0024] On the other hand, the present application further provides a power module, comprising a power module body and at least one power module terminal as described in any one of the aforementioned embodiments, wherein the power module body is connected to the at least one power module terminal.

[0025] Compared with the prior art, this application has the following beneficial effects:

[0026] The present application provides a power module terminal and a power module, wherein the power module terminal includes: a main terminal, a first extension terminal and a second extension terminal. The main terminal includes an internal connection part, an intermediate part and an external connection part connected in sequence; the internal connection part is also connected to the power module body, and the external connection part is also connected to an external device, and the main terminal is used to realize the electrical connection between the power module body and the external device. The internal connection part, the external connection part, the first extension terminal and the second extension terminal are all made of the same conductive material, and the intermediate part is made of a high-resistance alloy material with a known resistance value. The inner end of the first extension terminal is connected to the external connection part, and the outer end of the first extension terminal is used to output a first voltage. The first voltage is the voltage at one end of the intermediate part close to the external connection part. The inner end of the second extension terminal is connected to the power module body or the internal connection part, and the outer end of the second extension terminal is used to output a second voltage. The second voltage is the voltage at one end of the intermediate part close to the internal connection part.

[0027] When the power module terminal is in operation, current flows from the inner connection portion to the outer connection portion. By detecting the first voltage on the first extension terminal, the voltage value of the middle portion near the outer connection portion can be obtained. By detecting the second voltage on the second extension terminal, the voltage value of the middle portion near the inner connection portion can be obtained. Based on the voltage difference between the first extension terminal and the second extension terminal, that is, the difference between the first voltage and the second voltage, the voltage difference generated when the current flows through the middle portion can be obtained. Since the middle portion is made of a high-resistance alloy material with a known resistance value, the resistance value of the middle portion is known. Therefore, the current on the main terminal can be obtained by dividing the obtained voltage difference by the resistance value of the middle portion.

[0028] Compared to existing technologies, this application designs the structure and materials of the power module terminals, making them easier to manufacture. Current can be detected using the power module terminals themselves, eliminating the need for an additional magnetic sensing module and reducing costs. Furthermore, since high currents do not flow through the first and second extension terminals and the main terminal does not need to be lengthened, parasitic inductance is reduced, thereby improving current detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] Figure 1 It is a structural diagram of the existing power terminal;

[0031] Figure 2 This is one of the structural schematic diagrams of the first power module terminal provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the principle of the first power module terminal provided in an embodiment of the present application;

[0033] Figure 4 This is one of the structural diagrams of the second power module terminal provided in an embodiment of the present application;

[0034] Figure 5A schematic diagram of the principle of the second power module terminal provided in an embodiment of the present application;

[0035] Figure 6 This is one of the structural schematic diagrams of the third power module terminal provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the principle of a third type of power module terminal provided in an embodiment of the present application;

[0037] Figure 8 This is a second structural diagram of the first power module terminal provided in an embodiment of the present application;

[0038] Figure 9 This is a second structural diagram of the second power module terminal provided in an embodiment of the present application;

[0039] Figure 10 This is the second structural schematic diagram of the third power module terminal provided in an embodiment of the present application.

[0040] Icon: 10-power module terminal; 100-main terminal; 110-inner connection part; 120-middle part; 130-external connection part; 200-first extension terminal; 210-first horizontal terminal; 220-first vertical terminal; 300-second extension terminal; 310-second horizontal terminal; 320-second vertical terminal; 20-power module body; 30-external device; 40-magnetic induction module; 50-power terminal. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0042] In the description of this application, it should be noted that relational terms such as first and second are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The term "connected" should be understood broadly, for example, it can mean fixed connection, detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium.

[0043] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. The following embodiments and features thereof may be combined with each other unless there is any conflict.

[0044] See also Figure 1 As described in the background technology, one end of the power terminal 50 is connected to the power module body 20, and the other end is connected to an external device such as a cable. In order to detect the current output by the power terminal 50, most current methods use a magnetic induction module 40 that is externally mounted between the power terminal 50 and the cable. The magnetic field generated when the current passes through is used as the detection target, and the magnetic field induction principle is used to detect the current at the power terminal 50. However, using the magnetic induction module 40 to detect the current value at the power terminal 50 will increase the cost, and in order to have enough space to accommodate the magnetic induction module 40, the length of the power terminal 50 needs to be lengthened to provide space. However, the lengthened power terminal 50 will increase the parasitic inductance, causing interference and energy loss problems, affecting the accuracy of current detection.

[0045] In summary, how to accurately detect the current at the power module terminals while reducing costs is a technical problem that needs to be urgently solved by those skilled in the art.

[0046] To solve the above technical problems, please refer to Figures 2 to 7 The embodiment of the present application provides a power module terminal 10 , including: a main terminal 100 , a first extended terminal 200 and a second extended terminal 300 .

[0047] The main terminal 100 includes an inner connection portion 110, an intermediate portion 120, and an outer connection portion 130, which are connected in sequence. The inner connection portion 110 is also connected to the power module body 20, and the outer connection portion 130 is also connected to an external device 30 (e.g., a cable). The main terminal 100 is used to achieve electrical connection and energy transmission between the power module body 20 and the external device 30.

[0048] The inner connecting portion 110 , the outer connecting portion 130 , the first extending terminal 200 and the second extending terminal 300 are all made of the same conductive material, and the middle portion 120 is made of a high-resistance alloy material with a known resistance value.

[0049] The inner end of the first extension terminal 200 is connected to the external connection portion 130 , and the outer end of the first extension terminal 200 is used to output a first voltage V1 , which is the voltage at one end of the middle portion 120 close to the external connection portion 130 .

[0050] The inner end of the second extension terminal 300 is connected to the power module body 20 or the inner connection portion 110 , and the outer end of the second extension terminal 300 is used to output a second voltage V2 . The second voltage V2 is the voltage at one end of the middle portion 120 close to the inner connection portion 110 .

[0051] Optionally, the width of the first extension terminal 200 and the width of the second extension terminal 300 are both smaller than the width of the main terminal 100 .

[0052] When the power module terminal 10 is in operation, current flows from the inner connection portion 110 to the outer connection portion 130. In other words, the current output by the power module body 20 primarily flows through the main terminal 100 to the external device 30. The first and second extended terminals 200 and 300, acting as auxiliary terminals, do not experience significant current flow. Therefore, the first and second voltages V1 and V2 obtained through the first and second extended terminals 200 and 300 fully reflect the voltage difference ΔV generated when current passes through the intermediate portion 120. This voltage difference ΔV and the known resistance value can be used to determine the current flowing through the main terminal 100.

[0053] Specifically, when current flows from the internal connection portion 110 to the external connection portion 130 (i.e., the power module body 20 outputs current to the external device 30), the voltage value at the end of the middle portion 120 near the external connection portion 130 can be obtained by detecting the magnitude of the first voltage V1 on the first extension terminal 200. The voltage value at the end of the middle portion 120 near the internal connection portion 110 can be obtained by detecting the magnitude of the second voltage V2 on the second extension terminal 300. The voltage difference ΔV between the first extension terminal 200 and the second extension terminal 300 (i.e., the difference between the first voltage V1 and the second voltage V2) can be used to determine the voltage difference ΔV generated when current passes through the middle portion 120. Since the middle portion 120 is made of a high-resistance alloy material with a known resistance, the resistance of the middle portion 120 is also known. Therefore, the magnitude of the current flowing through the main terminal 100 can be determined by dividing the voltage difference ΔV by the resistance of the middle portion 120.

[0054] Compared to the prior art method of using a magnetic induction module to detect terminal current, the present invention has designed the structure and materials of the power module terminal 10, making it easier to manufacture. Current can be detected using the power module terminal 10 itself, eliminating the need for an additional magnetic induction module and reducing costs. Furthermore, since high current does not flow through the first and second extension terminals 200 and 300, and the main terminal 100 does not need to be lengthened, parasitic inductance is reduced, thereby improving the accuracy of current detection.

[0055] Regarding the composition of high-resistance alloy materials, since common materials such as iron, nickel, and aluminum have high impedance, the voltage generated when current passes through them is excessive, leading to severe overheating and energy loss. To avoid this problem, in the embodiments of this application, the composition and weight ratio of the high-resistance alloy material are: 39.2-55.3% copper, 14.7-54.8% nickel, and 0-15.1% manganese. Furthermore, the temperature coefficient of resistance of the high-resistance alloy material is less than 20 ppm / °C.

[0056] As can be understood, by configuring the composition and weight ratio of the high-resistance alloy material, this application can avoid excessive impedance, which could lead to severe overheating and energy loss when current passes through it. Furthermore, the resistivity of this high-resistance alloy material is extremely insensitive to temperature, preventing excessive measurement errors in current detection when the module temperature fluctuates, further improving current detection accuracy.

[0057] In an alternative embodiment, see Figures 2 to 5 The internal connection portion 110, external connection portion 130, first extension terminal 200, and second extension terminal 300 are all made of copper. The resistance of the internal connection portion 110 = the resistance of the external connection portion 130 = the resistance of the first extension terminal 200 = the resistance of the second extension terminal 300 = R1. The resistance of the middle portion 120 = R2, with R2 > R1.

[0058] Based on the above design, since R2>R1, the current will only cause a significant voltage rise and generate a significant voltage difference ΔV when it passes through the middle portion 120. In this case, the inner end of the second extension terminal 300 is connected to the power module body 20 (such as Figure 2 and Figure 3 As shown) is equivalent to the inner end of the second extension terminal 300 being connected to the inner connection portion 110 (as shown Figure 4 and Figure 5 That is, the voltage at one end of the middle portion 120 close to the inner connection portion 110 = Figure 2 The voltage at the inner end of the second extension terminal 300 in Figure 5 The voltage at the inner end of the second extension terminal 300 in FIG. 3 is equal to the first voltage V1.

[0059] Furthermore, the resistance difference ΔR = R2 - R1. When ΔR > the preset resistance threshold, it indicates that the resistance of the middle portion 120 is much greater than the resistances of the internal connection portion 110, the external connection portion 130, the first extension terminal 200, and the second extension terminal 300. At this point, because the resistances of the internal connection portion 110, the external connection portion 130, the first extension terminal 200, and the second extension terminal 300 are very small, the voltage change is not significant. Therefore, the inner end of the first extension terminal 200 can be connected to any position of the external connection portion 130 (because the voltage at any position of the external connection portion 130 can be considered equal to the voltage at the end of the middle portion 120 closest to the external connection portion 130), or even to the end of the external connection portion 130 (i.e., the end of the external connection portion 130 away from the middle portion 120). Similarly, the inner end of the second extension terminal 300 can also be connected to any position of the internal connection portion 110 or to the power module body 20.

[0060] When 0 < ΔR ≤ the preset resistance threshold, the resistance of the middle portion 120 is substantially similar to that of the internal connection portion 110, the external connection portion 130, the first extension terminal 200, and the second extension terminal 300. To ensure a more accurate final current detection result, the inner end of the first extension terminal 200 is connected to the side of the external connection portion 130 closest to the middle portion 120 (i.e., the inner end of the first extension terminal 200 is adjacent to one end of the middle portion 120), and the inner end of the second extension terminal 300 is connected to the side of the internal connection portion 110 closest to the middle portion 120 (i.e., the inner end of the second extension terminal 300 is adjacent to the other end of the middle portion 120) or to the power module body 20.

[0061] It can be seen that when R2>R1, the embodiment of the present application provides two different power module terminals 10. One is that the inner end of the second extension terminal 300 is connected to the power module body 20 (such as Figure 2 and Figure 3 As shown), the other is that the inner end of the second extension terminal 300 is connected to the inner connection portion 110 (as shown Figure 4 and Figure 5 shown).

[0062] In another alternative embodiment, see Figures 6 and 7 The inner end of the second extension terminal 300 is connected to the inner connection portion 110. The main terminal 100, the first extension terminal 200, and the second extension terminal 300 are all made of a high-resistance alloy material with a known resistance value, and the main terminal 100, the first extension terminal 200, and the second extension terminal 300 are integrally formed. In other words, the resistance values ​​of the inner connection portion 110, the middle portion 120, the outer connection portion 130, the first extension terminal 200, and the second extension terminal 300 are all equal and known.

[0063] When the power module terminal 10 is in the working state, since the main terminal 100 has a high resistance value, the direction from the inner connection portion 110 to the outer connection portion 130 (ie Figure 7 A significant voltage difference (in the direction of the black arrow) is generated. By measuring the first voltage V1 on the first extension terminal 200 and the second voltage V2 on the second extension terminal 300, the voltage difference ΔV across the middle portion 120 can be determined. Finally, dividing this voltage difference ΔV by the known resistance of the middle portion 120 yields the current value across the main terminal 100.

[0064] It can be seen that the embodiment of the present application provides three different power module terminals 10. The first power module terminal 10 is as follows: Figure 2 and Figure 3 As shown, the second power module terminal 10 is as shown in FIG. Figure 4 and Figure 5 As shown, the third power module terminal 10 is as shown in FIG. Figure 6 and Figure 7Compared to the third power module terminal 10 entirely made of high-resistance alloy material, only the middle portion 120 of the first power module terminal 10 and the second power module terminal 10 is made of high-resistance alloy material. Therefore, the manufacturing cost of the first power module terminal 10 and the second power module terminal 10 is lower.

[0065] Furthermore, in order to facilitate the installation of the power module terminal 10, when the inner end of the second extension terminal 300 is connected to the power module body 20, please refer to Figure 8 The first extending terminal 200 includes a first horizontal terminal 210 and a first vertical terminal 220 .

[0066] One end of the first horizontal terminal 210 is perpendicularly connected to the external connection portion 130, and the other end of the first horizontal terminal 210 is perpendicularly connected to the first vertical terminal 220. Furthermore, the main terminal 100, the first vertical terminal 220 and the second extension terminal 300 are parallel to each other.

[0067] When the inner end of the second extension terminal 300 is connected to the inner connection portion 110, refer to Figure 9 and Figure 10 The first extension terminal 200 includes a first horizontal terminal 210 and a first vertical terminal 220 , and the second extension terminal 300 includes a second horizontal terminal 310 and a second vertical terminal 320 .

[0068] The length of the second horizontal terminal 310 is greater than that of the first horizontal terminal 210, and the length of the second vertical terminal 320 is greater than that of the first vertical terminal 220. One end of the first horizontal terminal 210 is perpendicularly connected to the external connection portion 130, and the other end of the first horizontal terminal 210 is perpendicularly connected to the first vertical terminal 220. One end of the second horizontal terminal 310 is perpendicularly connected to the internal connection portion 110, and the other end of the second horizontal terminal 310 is perpendicularly connected to the second vertical terminal 320. Furthermore, the main terminal 100, the first vertical terminal 220, and the second vertical terminal 320 are parallel to each other, and the first horizontal terminal 210 and the second horizontal terminal 310 are parallel to each other.

[0069] Optionally, one end of the external connection portion 130 away from the middle portion 120 (ie, the end of the external connection portion 130 ), the outer end of the first extension terminal 200 , and the outer end of the second extension terminal 300 are all located on the same horizontal line.

[0070] In addition, an embodiment of the present application further provides a power module, which includes a power module body 20 and at least one power module terminal 10 as described in any of the above embodiments.

[0071] In summary, an embodiment of the present application provides a power module terminal and a power module, wherein the power module terminal includes: a main terminal, a first extension terminal and a second extension terminal. The main terminal includes an internal connection portion, an intermediate portion and an external connection portion connected in sequence; the internal connection portion is also connected to the power module body, and the external connection portion is also connected to an external device, and the main terminal is used to realize an electrical connection between the power module body and the external device. The internal connection portion, the external connection portion, the first extension terminal and the second extension terminal are all made of the same conductive material, and the intermediate portion is made of a high-resistance alloy material with a known resistance value. The inner end of the first extension terminal is connected to the external connection portion, and the outer end of the first extension terminal is used to output a first voltage. The first voltage is the voltage at one end of the intermediate portion close to the external connection portion. The inner end of the second extension terminal is connected to the power module body or the internal connection portion, and the outer end of the second extension terminal is used to output a second voltage. The second voltage is the voltage at one end of the intermediate portion close to the internal connection portion.

[0072] When the power module terminal is in working state, the current flows from the internal connection part to the external connection part. By detecting the first voltage on the first extension terminal, the voltage value of the end of the middle part close to the external connection part can be obtained, and by detecting the second voltage on the second extension terminal, the voltage value of the end of the middle part close to the internal connection part can be obtained. According to the difference between the first voltage and the second voltage (that is, the voltage difference between the first extension terminal and the second extension terminal), the voltage difference generated when the current passes through the middle part can be obtained. Since the middle part is made of a high-resistance alloy material with a known resistance value, that is, the resistance value of the middle part is known. Therefore, the current on the main terminal can be obtained by dividing the obtained voltage difference by the resistance value of the middle part.

[0073] Compared to existing technologies, this application designs the structure and materials of the power module terminals, making them easier to manufacture. Current can be detected using the power module terminals themselves, eliminating the need for an additional magnetic sensing module and reducing costs. Furthermore, since high currents do not flow through the first and second extension terminals and the main terminal does not need to be lengthened, parasitic inductance is reduced, thereby improving current detection accuracy.

[0074] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

[0075] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A power module terminal, characterized in that: include: a main terminal, a first extension terminal, and a second extension terminal; The main terminal includes an inner connecting portion, an intermediate portion, and an outer connecting portion connected in sequence; the inner connecting portion is also connected to the power module body, and the outer connecting portion is also connected to an external device, and the main terminal is used to achieve electrical connection between the power module body and the external device; The inner connecting portion, the outer connecting portion, the first extension terminal and the second extension terminal are all made of the same conductive material, and the middle portion is made of a high-resistance alloy material with a known resistance value; The inner end of the first extension terminal is connected to the external connection portion, and the outer end of the first extension terminal is used to output a first voltage; wherein the first voltage is the voltage of one end of the middle portion close to the external connection portion; The inner end of the second extension terminal is connected to the power module body or the inner connection portion, and the outer end of the second extension terminal is used to output a second voltage; wherein the second voltage is the voltage of one end of the middle portion close to the inner connection portion; When the power module terminal is in an operating state, current flows from the inner connection portion to the outer connection portion.

2. The power module terminal according to claim 1, characterized in that: The inner connecting portion, the outer connecting portion, the first extending terminal and the second extending terminal are all made of metal copper; The resistance of the inner connecting portion=the resistance of the outer connecting portion=the resistance of the first extending terminal=the resistance of the second extending terminal=R1, the resistance of the middle portion=R2, and R2>R1.

3. The power module terminal according to claim 2, characterized in that: The resistance difference ΔR=R2-R1, when 0<ΔR≤preset resistance threshold, the inner end of the first extension terminal is connected to the side of the external connection portion close to the middle portion, and the inner end of the second extension terminal is connected to the power module body or the side of the internal connection portion close to the middle portion.

4. The power module terminal according to claim 2, characterized in that: The inner end of the second extension terminal is connected to the power module body, and the first extension terminal includes a first horizontal terminal and a first vertical terminal; One end of the first horizontal terminal is vertically connected to the external connection portion, and the other end of the first horizontal terminal is vertically connected to the first vertical terminal; the main terminal, the first vertical terminal and the second extension terminal are parallel to each other.

5. The power module terminal according to claim 1, characterized in that: The inner end of the second extension terminal is connected to the inner connecting portion. The first extension terminal includes a first horizontal terminal and a first vertical terminal. The second extension terminal includes a second horizontal terminal and a second vertical terminal. The length of the second horizontal terminal is greater than that of the first horizontal terminal, and the length of the second vertical terminal is greater than that of the first vertical terminal. One end of the first horizontal terminal is vertically connected to the external connection part, and the other end of the first horizontal terminal is vertically connected to the first vertical terminal; one end of the second horizontal terminal is vertically connected to the internal connection part, and the other end of the second horizontal terminal is vertically connected to the second vertical terminal; the main terminal, the first vertical terminal and the second vertical terminal are parallel to each other, and the first horizontal terminal and the second horizontal terminal are parallel to each other.

6. The power module terminal according to claim 1, characterized in that: The inner end of the second extension terminal is connected to the inner connecting portion; the main terminal, the first extension terminal and the second extension terminal are all made of the high-resistance alloy material with a known resistance value, and the main terminal, the first extension terminal and the second extension terminal are integrally formed.

7. The power module terminal according to claim 1, characterized in that: The composition and weight ratio of the high-resistance alloy material are: 39.2-55.3% copper, 14.7-54.8% nickel, and 0-15.1% manganese, and the resistance temperature coefficient of the high-resistance alloy material is less than 20 ppm / °C.

8. The power module terminal according to claim 1, characterized in that: The width of the first extension terminal and the width of the second extension terminal are both smaller than the width of the main terminal.

9. The power module terminal according to claim 1, characterized in that: An end of the external connection portion away from the middle portion, an outer end of the first extension terminal, and an outer end of the second extension terminal are all located on the same horizontal line.

10. A power module, characterized in that: The power module includes a power module body and at least one power module terminal according to any one of claims 1 to 9, wherein the power module body is connected to the at least one power module terminal.

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