Conductive connection structure of capacitor pole and laminated busbar

Abstract

The application relates to the technical field of capacitor assembly, and provides a conductive connection structure of a capacitor pole and a laminated busbar, which comprises a capacitor, a laminated busbar and a first connecting piece.The capacitor comprises a first pole and a second pole;the laminated busbar comprises a first busbar, a second busbar and at least one insulating layer; the at least one insulating layer is arranged between the first busbar and the second busbar, so that the first busbar and the second busbar are electrically isolated; the laminated busbar is provided with a first connecting hole and a second connecting hole; the first pole is arranged in the first connecting hole; and the second pole is arranged in the second connecting hole.The application effectively solves the problems of creep loosening and copper-aluminum electrochemical corrosion, improves the anti-vibration and anti-fatigue performance of the connection structure, maintains a stable conductive path, reduces contact resistance, and reduces power loss in the current transmission process.

Description

Technical Field

[0001] This application belongs to the field of capacitor assembly technology, specifically relating to the conductive connection structure between capacitor terminals and stacked busbars. Background Technology

[0002] In power electronic equipment (such as inverters for new energy vehicles, energy storage converters, and industrial frequency converters), capacitors, as key energy storage components, directly affect the reliability and safety of the entire module due to the conductive connection performance between their electrode posts and the stacked busbars. Currently, the connection between capacitor posts and stacked busbars is mainly achieved using bolt fastening. However, this method presents the following problems in practical applications: Power electronic equipment typically operates in environments with high-frequency vibration (such as vehicle bumps or equipment resonance) and wide temperature cycling (-40℃~125℃). Bolt fastening requires applying preload through shims or springs. However, as power electronic equipment operates in high-frequency vibration and temperature cycling environments for extended periods, the preload can easily decay due to creep effects in the metal materials, leading to loose connections, increased contact resistance, and consequently, increased localized heating, potentially even posing a fire risk. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, this application provides a conductive connection structure between a capacitor terminal and a stacked busbar, comprising:

[0006] A capacitor, the capacitor comprising a first electrode post and a second electrode post;

[0007] A stacked busbar, comprising a first busbar, a second busbar, and at least one insulating layer, wherein at least one insulating layer is disposed between the first busbar and the second busbar to electrically isolate the first busbar and the second busbar, and the stacked busbar is provided with a first connection hole and a second connection hole, wherein a first electrode post is disposed in the first connection hole and a second electrode post is disposed in the second connection hole;

[0008] A first connector is disposed in the first connecting hole. The first end of the first connector is connected to the first busbar, and the second end is welded to the first electrode post. When the first connector is connected to the first busbar and the first electrode post, the first connector and the second busbar remain in a non-contact state.

[0009] The second connector is disposed in the second connection hole. The first end of the second connector is connected to the second busbar, and the second end is welded to the second electrode post. When the second connector is connected to the second busbar and the second electrode post, the second connector is in a non-contact state with the first busbar.

[0010] Optionally, the first connector includes:

[0011] The first connecting segment has its first end connected to the first busbar;

[0012] The second connecting segment has a first end connected to the second end of the first connecting segment. The second end of the second connecting segment extends obliquely away from the first busbar, and the second end of the second connecting segment is provided with a first fixing hole. The wall of the first fixing hole is in contact with the outer peripheral surface of the first electrode post.

[0013] Optionally, the outer periphery of the first electrode post is recessed inward to form a first step, and the second end of the second connecting segment abuts against the stepped surface of the first step.

[0014] Optionally, the first busbar, the first connector, and the first electrode post are all made of aluminum.

[0015] Optionally, the first busbar and the first connector are welded together or integrally formed.

[0016] Optionally, the second connector includes:

[0017] The third connecting section, the first end of which is connected to the second busbar;

[0018] The fourth connecting segment has a first end connected to the second end of the third connecting segment. The second end of the fourth connecting segment extends obliquely away from the second busbar, and a second fixing hole is provided on the second end of the fourth connecting segment. The wall of the second fixing hole is in contact with the outer peripheral surface of the second electrode post.

[0019] Optionally, the outer peripheral surface of the second electrode post is recessed inward to form a second step, and the second end of the third connecting segment and the first end of the fourth connecting segment abut against the step surface of the second step.

[0020] Optionally, the second busbar, the second connector, and the second electrode post are all made of aluminum.

[0021] Optionally, the second busbar and the second connector are welded together or integrally formed.

[0022] Optionally, the first connector and the first electrode post are connected by laser welding, and the second connector and the second electrode post are connected by laser welding.

[0023] Beneficial effects:

[0024] The conductive connection structure between a capacitor terminal and a stacked busbar provided in the embodiments of the present invention, through the provision of a first connector and a second connector, enables welding connections between the first busbar and the first connector and the first electrode terminal, and between the second busbar and the second connector and the second electrode terminal. This effectively solves the problems of creep loosening and electrochemical corrosion of copper and aluminum, improves the vibration resistance and fatigue resistance of the connection structure, maintains a stable conductive path, reduces contact resistance, and reduces power loss during current transmission. Simultaneously, reducing contact resistance can reduce material oxidation and performance degradation caused by local overheating, slowing down the aging rate of the connection parts and indirectly extending the service life of the module and the entire power electronic system. Furthermore, the welding connection eliminates the need for bolts, gaskets, and other additional accessories, simplifying the structural layout, reducing the space occupied by the connection parts, creating conditions for high-density integration of the module, and adapting to the miniaturization and lightweight requirements of new energy vehicles, energy storage devices, and other applications. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the present application;

[0026] Figure 2 This is a cross-sectional view of the structure of this application;

[0027] Figure 3 For this application Figure 2 Enlarged view of the structure at point A in the middle;

[0028] Figure 4 This is a structural diagram of the first electrode post of this application;

[0029] Figure 5 This is a structural diagram of the second electrode post of this application.

[0030] The reference numerals in the attached figures are as follows:

[0031] 1. Capacitor; 11. First electrode post; 12. Second electrode post; 2. Stacked busbar; 21. First busbar; 22. Second busbar; 23. Insulating layer; 3. First connector; 31. First connecting segment; 32. Second connecting segment; 4. Second connector; 41. Third connecting segment; 42. Fourth connecting segment; 5. First step; 6. Second step. Detailed Implementation

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] See also Figure 1-5 As shown, this embodiment provides a conductive connection structure between a capacitor terminal and a stacked busbar, including:

[0037] Capacitor 1 includes a first electrode post 11 and a second electrode post 12;

[0038] The stacked busbar 2 includes a first busbar 21, a second busbar 22 and at least one insulating layer 23. The at least one insulating layer 23 is disposed between the first busbar 21 and the second busbar 22 to electrically isolate the first busbar 21 and the second busbar 22. The stacked busbar 2 has a first connection hole and a second connection hole through it. A first electrode post 11 is disposed in the first connection hole and a second electrode post 12 is disposed in the second connection hole.

[0039] The first connector 3 is disposed in the first connecting hole. The first end of the first connector 3 is connected to the first busbar 21, and the second end is welded to the first electrode post 11. When the first connector 3 is connected to the first busbar 21 and the first electrode post 11, the first connector 3 and the second busbar 22 remain in a non-contact state.

[0040] The second connector 4 is disposed in the second connection hole. The first end of the second connector 4 is connected to the second busbar 22, and the second end is welded to the second electrode post 12. When the second connector 4 is connected to the second busbar 22 and the second electrode post 12, the second connector 4 is in a non-contact state with the first busbar 21.

[0041] The conductive connection structure between the capacitor posts and the stacked busbar provided in this application embodiment includes a capacitor 1, a stacked busbar 2, a first connector 3, and a second connector 4. The capacitor 1 has a first electrode post 11 and a second electrode post 12. The stacked busbar 2 is composed of a first busbar 21, a second busbar 22, and at least one insulating layer 23. Electrical isolation between the first busbar 21 and the second busbar 22 is achieved by installing the insulating layer 23 between them. A first connection hole and a second connection hole are formed through the stacked busbar 2 for mounting the first electrode post 11 and the second electrode post 12. The first connector 3 and the second connector 4 are correspondingly disposed within the first connection hole and the second connection hole. The first end of the first connector 3 is connected to the first busbar 21, and the second end passes through... After passing through the first connection hole on the second busbar 22, the first connector 3 is connected to the first electrode post 11. During the process of passing through the first connection hole, the first connector 3 remains in a non-contact state with the second busbar 22. The first end of the second connector 4 is connected to the second busbar 22, and the second end passes through the second connection hole on the first busbar 21 and is connected to the second electrode post 12. During the process of passing through the second connection hole, the second connector 4 remains in a non-contact state with the first busbar 21. The first connector 3 can connect the first busbar 21 and the first electrode post 11 while also forming an independent conductive path between the first busbar 21 and the first electrode post 11. The second connector 4 can connect the second busbar 22 and the second electrode post 12 while also forming an independent conductive path between the second busbar 22 and the second electrode post 12.

[0042] Based on this, the first connector 3 and the second connector 4 are configured to achieve independent conductive paths between the first busbar 21 and the first electrode post 11, and between the second busbar 22 and the second electrode post 12. Combined with the isolation effect of the insulating layer 23, the risk of short circuit between the positive and negative electrodes is effectively avoided. At the same time, the welded connection between the first connector 3 and the first electrode post 11, and between the second connector 4 and the second electrode post 12, avoids the problem of preload attenuation caused by vibration and temperature cycling in bolted connections. In traditional bolted connections, the difference between metal creep and thermal expansion coefficients will cause the contact pressure to gradually decrease. However, the welded integrated structure can resist long-term stress, effectively solve the problems of creep loosening and copper-aluminum electrochemical corrosion, improve the vibration resistance and fatigue resistance of the connection structure, maintain a stable conductive path, reduce contact resistance, and reduce power loss during current transmission. In addition, reducing contact resistance can reduce material oxidation and performance degradation caused by local overheating, slow down the aging rate of the connection parts, and indirectly extend the service life of the module and the entire power electronic system. In addition, welding connections do not require additional accessories such as bolts and gaskets, which can simplify the structural layout, reduce the space occupied by the connection parts, create conditions for high-density integration of modules, and adapt to the miniaturization and lightweight requirements of new energy vehicles, energy storage equipment, etc.

[0043] It is understandable that the first busbar 21, the insulating layer 23, and the second busbar 22 are stacked sequentially from top to bottom. This structure can effectively reduce the overall space occupied and significantly improve space utilization. The first busbar 21 can be used as either a positive or negative busbar, and its polarity is not limited. Correspondingly, the first electrode post 11 has the same electrical polarity as the first busbar 21, and the second electrode post 12 has the same electrical polarity as the second busbar 22. The electrical relationship between the two is matched according to the polarity settings of the first busbar 21 and the second busbar 22, which is also not limited here.

[0044] Understandably, the number of insulation layers 23 can be adjusted according to insulation requirements. For example, when the insulation performance requirements are high, two or more insulation layers 23 can be stacked to enhance the electrical isolation effect between the first busbar 21 and the second busbar 22.

[0045] In one feasible implementation, the first connector 3 includes:

[0046] The first connecting section 31, the first end of the first connecting section 31 is connected to the first busbar 21;

[0047] The second connecting segment 32 has its first end connected to the second end of the first connecting segment 31. The second end of the second connecting segment 32 extends obliquely away from the first busbar 21, and the second end of the second connecting segment 32 is provided with a first fixing hole. The wall of the first fixing hole is in contact with the outer peripheral surface of the first electrode post 11.

[0048] In this technical solution, the first connector 3 includes a first connecting segment 31 and a second connecting segment 32. The first end of the first connecting segment 31 is connected to the first busbar 21 and is located on the insulating layer 23, thus physically isolating the first connecting segment 31 from the second busbar 22 and maintaining insulation between them. The second end of the second connecting segment 32 extends through a first connecting hole on the second busbar 22 towards the capacitor direction, with sufficient clearance between them to prevent contact and maintain insulation. This achieves complete insulation between the first connector 3 and the first busbar 21 while simultaneously connecting the first busbar 21 and the first electrode post 11. A first fixing hole is provided on the second end of the second connecting segment 32. The wall of the first fixing hole fits against the outer circumferential surface of the first electrode post 11, forming a stable mechanical positioning before welding and preventing misalignment caused by component movement during welding, thus ensuring the stability of the welding quality. Furthermore, the inclined extension of the second connecting section 32 can increase the contact area between the first connecting piece 3 and the first electrode post 11, resulting in a larger fusion area during welding, higher weld strength, enhanced vibration and fatigue resistance of the connection structure, avoidance of weld cracking risk during long-term use, improved conductivity and mechanical reliability of the overall connection structure, and reduction of local heating during current transmission.

[0049] In one feasible implementation, the outer peripheral surface of the first electrode post 11 is recessed inward to form a first step 5, and the second end of the second connecting segment 32 abuts against the stepped surface of the first step 5.

[0050] In this technical solution, the outer circumference of the first electrode post 11 is recessed inward to form a first step 5, and the second end of the second connecting segment 32 abuts against the stepped surface of the first step 5. This can limit the axial movement of the first electrode post 11, reducing displacement between the first electrode post 11 and the first connector 3 caused by vibration or stress during welding or use, and improving the stability of the connection between the first electrode post 11 and the first connector 3. Moreover, the stepped surface of the first step 5 abuts against the second end of the second connecting segment 32 to form a surface contact, which can disperse the axial force borne by the connection part (such as the pre-tightening force during module assembly, the vibration and impact force during operation), avoid stress concentration in the weld area, and reduce the risk of weld cracking due to excessive stress. At the same time, the relative position of the first connector 3 and the first electrode post 11 can be further calibrated before welding to ensure the concentricity of the first fixing hole and the first electrode post 11, making the annular weld formed by subsequent welding more uniform and further improving the connection strength.

[0051] In some examples, the stepped surface of the first step 5 is an annular plane, which is parallel to the second end plane of the second connecting segment 32. Based on this, the contact area can be maximized, and the stability of axial positioning and the force distribution effect can be improved.

[0052] In one feasible implementation, the first busbar 21, the first connector 3, and the first electrode post 11 are all made of aluminum.

[0053] The first busbar 21 and the first connector 3 are either welded together or integrally formed.

[0054] In this technical solution, since the first busbar 21, the first connector 3, and the first electrode post 11 are all made of aluminum, aluminum has excellent conductivity, which can ensure smooth current transmission. At the same time, its low density can effectively reduce the weight of the entire connection structure, which meets the lightweight requirements of power electronic equipment. The same material also makes the welding process of the first busbar 21 and the first connector 3 easier to control, the weld quality more stable, and reduces the generation of welding defects such as porosity and cracks.

[0055] It is understandable that the welding connection or integral molding structure of the first busbar 21 and the first connector 3 can further strengthen the stability of the connection between the two, reduce the contact resistance risks caused by the connection node, and improve the overall connection stability and conductivity efficiency.

[0056] It is understandable that when the first busbar 21 and the first connector 3 are connected by welding, laser welding can be used to meet the needs of mass production and ensure the consistency of connection quality. When an integral molding structure (such as stamping, casting and other processes) is adopted, the connection gap between the two can be completely eliminated, so that the first busbar 21 and the first connector 3 form a complete conductive whole, further improving the mechanical strength and vibration resistance of the structure.

[0057] In one feasible implementation, the second connector 4 includes:

[0058] The third connecting section 41, the first end of the third connecting section 41 is connected to the second busbar 22;

[0059] The fourth connecting segment 42 has its first end connected to the second end of the third connecting segment 41. The second end of the fourth connecting segment 42 extends obliquely away from the second busbar 22, and a second fixing hole is provided on the second end of the fourth connecting segment 42. The wall of the second fixing hole is in contact with the outer peripheral surface of the second electrode post 12.

[0060] In this technical solution, the second connector 4 includes a third connecting segment 41 and a fourth connecting segment 42. The first end of the third connecting segment 41 is connected to the second busbar 22 and is located under the insulating layer 23, thus physically isolating the third connecting segment 41 from the first busbar 21 and maintaining insulation between them. The second end of the fourth connecting segment 42 extends through a second connecting hole on the first busbar 21 in a direction away from the capacitor, with sufficient clearance between the fourth connecting segment 42 and the first busbar 21 to prevent contact and maintain insulation. This achieves complete insulation between the second connector 4 and the second busbar 22 while simultaneously connecting the second connector 4 to the second electrode post 12 and is completely insulated from the first busbar 21. A second fixing hole is provided on the second end of the fourth connecting segment 42. The wall of the second fixing hole fits against the outer circumferential surface of the second electrode post 12, forming a stable mechanical positioning before welding and preventing misalignment caused by component movement during welding, thus ensuring the stability of the welding quality. Furthermore, the inclined extension of the fourth connecting section 42 can increase the contact area between the second connecting piece 4 and the second electrode post 12, resulting in a larger fusion area during welding, higher weld strength, enhanced vibration and fatigue resistance of the connection structure, avoidance of weld cracking risk during long-term use, and thus improved conductivity and mechanical reliability of the overall connection structure, reducing local heating during current transmission.

[0061] In one feasible implementation, the outer peripheral surface of the second electrode post 12 is recessed inward to form a second step 6, and the second end of the third connecting segment 41 and the first end of the fourth connecting segment 42 abut against the stepped surface of the second step 6.

[0062] In this technical solution, the outer circumference of the second electrode post 12 is recessed inward to form a second step 6, and the second end of the third connecting segment 41 and the first end of the fourth connecting segment 42 abut against the stepped surface of the second step 6. This can limit the axial movement of the second electrode post 12, reducing displacement between the second electrode post 12 and the second connector 4 caused by vibration or stress during welding or use, and improving the stability of the connection between the second electrode post 12 and the second connector 4. Moreover, the stepped surface of the second step 6 abuts against the second end of the third connecting segment 41 and the first end of the fourth connecting segment 42 to form a surface contact, which can disperse the axial force borne by the second electrode post 12 (such as the pre-tightening force during module assembly and the vibration and impact force during operation), avoiding stress concentration in the weld area and reducing the risk of weld cracking due to excessive stress. At the same time, the relative position of the second connector 4 and the second electrode post 12 can be further calibrated before welding to ensure the concentricity of the second fixing hole and the second electrode post 12, making the annular weld formed by subsequent welding more uniform and further improving the connection strength.

[0063] In some examples, the stepped surface of the second step 6 is an annular plane, which is parallel to the second end plane of the third connecting segment 41. Based on this, the contact area can be maximized, and the stability of axial positioning and the force distribution effect can be improved.

[0064] In one feasible implementation, the second busbar 22, the second connector 4, and the second electrode post 12 are all made of aluminum.

[0065] The second busbar 22 and the second connector 4 are either welded together or integrally formed.

[0066] In this technical solution, since the second busbar 22, the second connector 4, and the second electrode post 12 are all made of aluminum, aluminum has excellent conductivity, which can ensure the smooth transmission of current. At the same time, its low density can effectively reduce the weight of the entire connection structure, which meets the requirements of lightweight power electronic equipment. The same material also makes the welding process of the second busbar 22 and the second connector 4 easier to control, the weld quality more stable, and reduces the generation of welding defects such as porosity and cracks.

[0067] It is understandable that the welding connection or integral molding structure of the second busbar 22 and the second connector 4 can further strengthen the stability of the connection between the two, reduce the contact resistance risks caused by the connection node, and improve the overall connection stability and conductivity efficiency.

[0068] It is understandable that when the second busbar 22 and the second connector 4 are connected by welding, laser welding can be used to meet the needs of mass production and ensure the consistency of connection quality. When an integral molding structure (such as stamping, casting and other processes) is adopted, the connection gap between the two can be completely eliminated, so that the second busbar 22 and the second connector 4 form a complete conductive whole, further improving the mechanical strength and vibration resistance of the structure.

[0069] In one feasible implementation, the first connector 3 and the first electrode post 11 are connected by laser welding, and the second connector 4 and the second electrode post 12 are connected by laser welding.

[0070] In this technical solution, laser welding is used to connect the first connector 3 to the first electrode post 11 and the second connector 4 to the second electrode post 12. Laser welding uses a high-energy-density laser beam focused on the welding area to instantly melt the contact points between the first connector 3 and the first electrode post 11, and between the second connector 4 and the second electrode post 12, forming a strong bond. This bonding method completely eliminates the contact gaps present in traditional mechanical connections (such as bolted connections), avoiding the problem of increased contact resistance due to gaps, significantly reducing power loss during current transmission, and effectively reducing Joule heating under high-current conditions, ensuring stable module operation. Since the first busbar 21, the first connector 3, the first electrode post 11, the second busbar 22, the second connector 4, and the second electrode post 12 are all made of aluminum, laser welding is compatible with aluminum components of the same material. It effectively removes the oxide film on the aluminum surface, ensuring the fusion quality of the weld and avoiding defects such as incomplete fusion and porosity caused by the oxide film, further improving the stability of the connection.

[0071] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A conductive connection structure between a capacitor terminal and a stacked busbar, characterized in that, include: A capacitor (1), the capacitor (1) comprising a first electrode post (11) and a second electrode post (12); A stacked busbar (2) includes a first busbar (21), a second busbar (22) and at least one insulating layer (23). At least one insulating layer (23) is disposed between the first busbar (21) and the second busbar (22) to electrically isolate the first busbar (21) and the second busbar (22). The stacked busbar (2) has a first connection hole and a second connection hole through it. The first electrode post (11) is disposed in the first connection hole and the second electrode post (12) is disposed in the second connection hole. The first connector (3) is disposed in the first connection hole. The first end of the first connector (3) is connected to the first busbar (21), and the second end is welded to the first electrode post (11). When the first connector (3) is connected to the first busbar (21) and the first electrode post (11), the first connector (3) and the second busbar (22) remain in a non-contact state. The second connector (4) is disposed in the second connection hole. The first end of the second connector (4) is connected to the second busbar (22), and the second end is welded to the second electrode post (12). When the second connector (4) is connected to the second busbar (22) and the second electrode post (12), the second connector (4) and the first busbar (21) remain in a non-contact state. The first connector (3) includes: The first connecting segment (31) is connected at its first end to the first busbar (21); The second connecting segment (32) has a first end connected to the second end of the first connecting segment (31). The second end of the second connecting segment (32) extends obliquely away from the first busbar (21). The second end of the second connecting segment (32) is provided with a first fixing hole. The hole wall of the first fixing hole is in contact with the outer peripheral surface of the first electrode post (11). Sufficient gap is reserved between the second connecting segment (32) and the second busbar (22) so that the second connecting segment (32) and the second busbar (22) remain insulated. The outer peripheral surface of the first electrode post (11) is recessed inward to form a first step (5), and the second end of the second connecting segment (32) abuts against the step surface of the first step (5); The second connector (4) includes: The third connecting section (41) has its first end connected to the second busbar (22); The fourth connecting segment (42) has its first end connected to the second end of the third connecting segment (41). The second end of the fourth connecting segment (42) extends obliquely away from the second busbar (22). A second fixing hole is provided on the second end of the fourth connecting segment (42). The wall of the second fixing hole is in contact with the outer peripheral surface of the second electrode post (12). Sufficient gap is reserved between the fourth connecting segment (42) and the first busbar (21) to keep the fourth connecting segment (42) and the first busbar (21) in an insulating state. The outer periphery of the second electrode post (12) is recessed inward to form a second step (6), and the second end of the third connecting segment (41) and the first end of the fourth connecting segment (42) abut against the step surface of the second step (6).

2. The conductive connection structure between the capacitor terminal and the stacked busbar according to claim 1, characterized in that, The first busbar (21), the first connector (3), and the first electrode post (11) are all made of aluminum.

3. The conductive connection structure between the capacitor terminal and the stacked busbar according to claim 2, characterized in that, The first busbar (21) and the first connector (3) are connected by welding or are integrally formed.

4. The conductive connection structure between the capacitor terminal and the stacked busbar according to claim 3, characterized in that, The second busbar (22), the second connector (4) and the second electrode post (12) are all made of aluminum.

5. The conductive connection structure between the capacitor terminal and the stacked busbar according to claim 4, characterized in that, The second busbar (22) and the second connector (4) are connected by welding or are integrally formed.

6. The conductive connection structure between the capacitor terminal and the stacked busbar according to claim 1, characterized in that, The first connector (3) and the first electrode post (11) are connected by laser welding, and the second connector (4) and the second electrode post (12) are connected by laser welding.

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