Capacitor, electric control system and electric equipment

Abstract

The embodiment of the utility model provides a capacitor, an electric control system and electric equipment, and relates to the technical field of electronic components, the capacitor comprises at least two capacitor cores, at least two positive electrode busbars and at least one negative electrode busbar, the capacitor cores are connected with the positive electrode busbars in a one-to-one correspondence manner, and the at least two capacitor cores are connected with the same negative electrode busbar. Therefore, the at least two capacitor cores share the cathode busbar, which is helpful for reducing the consumption of manufacturing consumables of the capacitor, increasing the integration level of the capacitor and improving the space utilization rate of the capacitor.

Description

Technical Field

[0001] The present application relates to the technical field of electronic components, and in particular to a capacitor, an electric control system, and an electric device. Background Art

[0002] Film capacitors have the advantages of low loss, high stability, and high insulation resistance. They are widely used in power supply filtering, signal coupling, oscillation circuits, high-frequency circuits, audio equipment, and industrial control.

[0003] Film capacitors mainly include capacitor cores, positive busbars, negative busbars, and shells. If two or more capacitor cores are integrated in a shell to achieve the effect of multiple capacitors, each capacitor core generally needs to be equipped with independent positive busbars and negative busbars, which leads to a complex capacitor structure and occupies a large space. Utility Model Content

[0004] The embodiments of the present application provide a capacitor, an electric control system, and an electric device to simplify the structure of the capacitor and reduce the space occupied by the capacitor.

[0005] A first aspect of an embodiment of the present application provides a capacitor, comprising at least two capacitor cores, at least two positive busbars and at least one negative busbar, wherein the capacitor cores are connected to the positive busbars in a one-to-one correspondence, and at least two of the capacitor cores are connected to the same negative busbar.

[0006] In some possible implementations, a terminal post is further included, and both the positive busbar and the negative busbar are provided with the terminal post.

[0007] In some possible embodiments, the positive busbar and the negative busbar are both provided with connection holes, one end of the terminal has a connection column, the connection column is inserted into the positive busbar or the negative busbar through the connection hole, and the connection column is interference fit with the connection hole.

[0008] In some possible implementations, the connecting column is welded to the hole wall of the connecting hole.

[0009] In some possible implementations, one end of the connecting post extends to the outside of the connecting hole, and at least one connecting groove is provided at the end of the connecting post extending to the outside of the connecting hole.

[0010] In some possible implementations, an extending direction of the connecting groove is the same as an extending direction of the terminal.

[0011] In some possible embodiments, the connecting column has a limiting portion, and the limiting portion is configured to cooperate with the hole wall of the connecting hole when the connecting column is inserted into the connecting hole to limit the relative position of the connecting column and the connecting hole.

[0012] In some possible implementations, the terminal includes a cylindrical segment and a polygonal segment connected to each other, the connecting column is located at one end of the polygonal segment away from the cylindrical segment, and the axial projection of the connecting column is located within the polygonal segment.

[0013] In some possible implementations, at least four capacitor groups are further included, and the two poles of each capacitor core are respectively connected in series with at least one of the capacitor groups.

[0014] In some possible implementations, the capacitor group includes a first capacitor and a second capacitor connected in parallel, and the first capacitor and the second capacitor have different capacitances.

[0015] In some possible implementations, twelve capacitor groups are provided, two capacitor cores are provided, three capacitor groups are connected in series at two poles of each capacitor core, and the capacitor groups at the same pole of the capacitor core are provided in parallel.

[0016] In some possible implementations, a grounding busbar is further included. The grounding busbar is provided with two grounding electrodes, and the capacitor groups connected to the same capacitor core are all connected to the same grounding busbar.

[0017] In some possible embodiments, the present invention further includes a shell and at least two heat sinks, wherein the capacitor core, the positive busbar, and the negative busbar are all located in the shell, and the heat sink cover is provided on the bottom side of the capacitor core facing away from the shell, and the shell is filled with potting compound to limit the positions of the capacitor core, the heat sink, the positive busbar, and the negative busbar in the shell through the potting compound.

[0018] In some possible implementations, at least one through hole is provided on the heat dissipation plate, so that the potting compound can flow between the heat dissipation plate and the capacitor core.

[0019] A second aspect of an embodiment of the present application provides an electronic control system, comprising the capacitor described in any one of the first aspects.

[0020] A third aspect of an embodiment of the present application provides an electrical device, comprising the electrical control system described in the second aspect.

[0021] In the capacitor, electric control system and electrical equipment provided in the embodiments of the present application, the capacitor includes at least two capacitor cores, at least two positive busbars and at least one negative busbar. Of the two poles of each capacitor core, one is connected to the positive busbar and the other is connected to the negative busbar. Each positive busbar is connected to only one capacitor core, while each negative busbar is connected to at least two capacitor cores, thereby integrating at least two capacitor cores in one capacitor, and multiple capacitor cores share the negative busbar, so as to achieve the functional effects of multiple capacitors while reducing the consumables required for capacitor production, increasing the integration of the capacitor, improving the space utilization inside the capacitor, and reducing the space occupied by the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 A schematic diagram of the internal structure of a capacitor provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 Front view of the capacitor in;

[0025] Figure 3 for Figure 1 Rear view of the capacitor in;

[0026] Figure 4 A schematic diagram of the separate structure of the terminal and the negative busbar in the capacitor provided in an embodiment of the present application;

[0027] Figure 5 for Figure 4 Schematic diagram of the connection structure between the terminal and the negative busbar;

[0028] Figure 6 A schematic diagram of the structure of the terminal in the capacitor provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the connection structure between the terminal and the positive busbar in the capacitor provided in an embodiment of the present application;

[0030] Figure 8 A three-dimensional diagram of a capacitor provided in an embodiment of the present application with the casing removed;

[0031] Figure 9 for Figure 8 A top view of the capacitor with the casing removed;

[0032] Figure 10 A schematic diagram of the circuit connection structure of a capacitor provided in an embodiment of the present application.

[0033] Reference numerals:

[0034] 100-capacitor core;

[0035] 200-negative busbar; 210-connection hole;

[0036] 300-positive busbar;

[0037] 400-connecting post; 410-connecting post; 411-connecting slot; 420-polygonal column segment; 430-cylindrical segment;

[0038] 500-shell;

[0039] 600-capacitor group; 610-first capacitor; 620-second capacitor;

[0040] 700-ground busbar; 710-ground electrode;

[0041] 800-heat sink; 810-through hole.

[0042] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0044] Glossary:

[0045] An electronic control system is a device that uses electronic equipment and software to control mechanical or electrical systems. Electronic control systems are widely used in various fields, including automotive, industrial automation, home appliances, aerospace, and medical equipment. In the new energy sector, electronic control systems typically include IGBT modules and capacitors.

[0046] IGBT module: A power module that integrates multiple IGBTs (Insulated Gate Bipolar Transistors) and other related components (such as diodes, drive circuits, and protection circuits). IGBT modules are widely used in applications requiring efficient power conversion and management, such as electric vehicles, industrial automation, and renewable energy systems.

[0047] Capacitors in electronic control systems are generally installed between the power supply and the IGBT module. They serve as a bridge connecting the power supply and the IGBT module, and also play the role of filtering, noise reduction and energy replenishment.

[0048] Currently, in a capacitor, generally one capacitor core needs to be provided with a corresponding positive busbar and a negative busbar. This results in a complex internal structure and a large space occupied when the capacitor needs to be provided with multiple capacitor cores that can work independently at the same time.

[0049] In order to avoid the above problems, the embodiments of the present application provide a capacitor, an electric control system and an electrical equipment. The capacitor allows two or more capacitor cores to share a negative busbar. While achieving the function of multiple capacitors, it can reduce the use of capacitor manufacturing consumables, increase the integration of capacitors, and improve space utilization.

[0050] It can be understood that the capacitors and electronic control systems provided in the embodiments of the present application can be applied to industrial automation, automotive electronics, renewable energy, communication equipment, medical equipment, aerospace, lighting systems and other fields, and the embodiments of the present application are not limited thereto.

[0051] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0052] See Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a capacitor, which includes a capacitor core 100, a positive busbar 300 and a negative busbar 200, and of course also includes a shell 500. The capacitor core 100, the positive busbar 300 and the negative busbar 200 are all arranged in the shell 500 and protected by the shell 500.

[0053] There are at least two capacitor cores 100 and at least two positive busbars 300, and at least one negative busbar 200. Each of the two poles of the capacitor core 100 is connected to a positive busbar 300 and a negative busbar 200. Each positive busbar 300 is connected to only one capacitor core 100, while each negative busbar 200 is connected to at least two capacitor cores 100, so that at least two capacitor cores 100 share one negative busbar 200.

[0054] Specifically, the capacitor can be a film capacitor, and the capacitor core 100 includes a dielectric film and two electrodes. The two electrodes are in contact with the surface of the dielectric film respectively, and the two electrodes are welded to the positive busbar 300 and the negative busbar 200 respectively.

[0055] Of course, the capacitor may also be other types of capacitors. This is just an example to illustrate the connection method, not to limit it.

[0056] When two capacitor cores 100 are provided, Figure 1 As shown in the figure, the two are arranged side by side in the housing 500, with the positive busbar 300 arranged at one end of the two capacitor cores 100 and the negative busbar 200 arranged at the other end, so as to effectively utilize the space. When more capacitor cores 100 are arranged, the arrangement of the capacitor cores 100 can be adjusted according to actual conditions, such as side by side, multiple rows, or layers. In this case, the number of capacitor cores 100 sharing the same negative busbar 200 can be adjusted accordingly according to the arrangement position of the capacitor cores 100, so as to facilitate assembly while improving space utilization.

[0057] Of course, the same negative busbar 200 can be composed of one or more copper bars. When there are multiple copper bars, they are interconnected and share a wiring terminal to be connected to devices such as IGBT.

[0058] In this embodiment, at least two capacitor cores 100 share one negative busbar 200, which not only helps to reduce the number of negative busbars 200 and the difficulty of layout, but also reduces the number of terminals of the negative busbar 200 for collecting current signals compared to traditional multi-capacitor capacitors, further reduces the consumables required for capacitor manufacturing, and improves space utilization.

[0059] In some embodiments, the capacitor also includes a shell 500, and the capacitor core 100, the positive busbar 300, and the negative busbar 200 are all located in the shell 500, and the shell 500 is filled with potting glue. The capacitor core 100, the positive busbar 300, and the negative busbar 200 can be fixed in the shell 500 by the potting glue to prevent them from shifting.

[0060] Among them, the potting glue can be epoxy resin potting glue, of course, it can also be other types of potting glue, as long as it can effectively fix the capacitor core 100, the positive busbar 300, and the negative busbar 200, and meet the use environment requirements of the capacitor. This embodiment does not limit it here.

[0061] The housing 500 may be made of materials such as polypropylene, polyester, or epoxy resin or other materials, as long as it can effectively protect the internal components. This embodiment does not limit it.

[0062] In addition, in existing designs, when connecting capacitors to other equipment, most of them use copper bars that are overlapped and locked on the adapter device for connection. This method requires the copper bars to be precisely aligned and locked, which makes installation more troublesome.

[0063] In this regard, the capacitor in this embodiment further includes a terminal 400 . Both the positive busbar 300 and the negative busbar 200 are provided with a terminal 400 , and are connected to the IGBT module and the like through the terminal 400 .

[0064] The terminal post 400 may be a copper post or other posts that can be used for conducting electricity, which is not limited in this embodiment.

[0065] Using a copper column as the terminal 400 not only covers the function of the adapter, but also serves as a carrier for current transmission and provides torque support for locking the opponent, so that the terminal 400 is not only easy to install and connect, but also low in cost.

[0066] However, existing copper pillars in capacitors are mostly used only as current signal acquisition terminals, with low overcurrent and low torque tolerance. When used in scenarios with higher overcurrent and requiring high torque support, the connection strength is insufficient, and the copper pillars are prone to loosening or even falling off during high torque tightening.

[0067] In this regard, Figure 4 As shown, this embodiment provides a capacitor, wherein a connection hole 210 is provided on the positive busbar 300 and the negative busbar 200, and one end of the terminal 400 has a connection column 410, which is inserted into the positive busbar 300 or the negative busbar 200 through the connection hole 210, and the connection column 410 is interference fit with the connection hole 210.

[0068] Thus, the terminal 400 is fixed to the positive busbar 300 or the negative busbar 200 through the interference fit between the connecting post 410 and the connecting hole 210, thereby improving the stability of the connection between the terminal 400 and the positive busbar 300 or the negative busbar 200.

[0069] Furthermore, the connection post 410 is welded to the wall of the connection hole 210. Specifically, soldering can improve the connection strength between the connection post 410 and the connection hole 210, thereby improving the torsional resistance of the terminal 400. Soldering can also reduce the contact resistance between the copper post and the positive busbar 300 or the negative busbar 200.

[0070] In some embodiments, as Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, one end of the connecting post 410 extends to the outside of the connecting hole 210 , and at least one connecting groove 411 is provided at the end of the connecting post 410 extending to the outside of the connecting hole 210 .

[0071] One end of the connecting column 410 extends outside the connecting hole 210, and can come into contact with the potting glue, thereby assisting in fixing the terminal 400 through the potting glue. A connecting groove 411 is provided on the connecting column 410, which can increase the contact surface between the connecting column 410 and the potting glue, increase the bonding force between the terminal 400 and the potting glue, and further enhance the fixing effect of the terminal 400. At the same time, the presence of the connecting groove 411 also helps to enhance the anti-rotation capability of the terminal 400.

[0072] Furthermore, the extension direction of the connection groove 411 is the same as the extension direction of the terminal 400, that is, the connection groove 411 is set toward the side of the connection column 410 away from the main body of the terminal 400, so as to further enhance the bonding force between the terminal 400 and the potting glue.

[0073] It is understandable that the number of the connecting grooves 411 can be one or more, and the direction of the connection grooves 411 can be adjusted according to actual conditions, which is not limited in this embodiment.

[0074] Of course, the length of the connecting post 410 extending from one end of the connecting hole 210 can be adjusted according to actual conditions, for example, extending 3 mm from the surface of the positive busbar 300 or the negative busbar 200, and the depth of the connecting groove 411 can also be set to 3 mm. It should be understood that this embodiment is merely an example and is not intended to be limiting.

[0075] In some embodiments, the connecting column 410 has a limiting portion. When the connecting column 410 is inserted into the connecting hole 210 , the limiting portion cooperates with the hole wall of the connecting hole 210 to limit the relative position of the connecting column 410 and the connecting hole 210 .

[0076] The limiting portion may be one or more surfaces of the connecting post 410 , or a structure protruding from the surface of the connecting post 410 .

[0077] Exemplarily, a rectangular surface is provided on each of the opposite sides of the connecting column 410, and the two ends of the rectangular surface are arc-shaped surfaces, and the arc-shaped surfaces are connected to the rectangular surfaces. The rectangular surfaces are the limiting parts. At this time, the connecting hole 210 is set as a strip hole, and the arc-shaped parts at both ends are in contact with the arc-shaped surfaces, while the middle part is in contact with the rectangular surface, thereby limiting the connecting column 410 and preventing the connecting column 410 from rotating in the connecting hole 210.

[0078] On this basis, the connecting groove 411 can also be located in the middle of the connecting column 410, so that the connecting column 410 can be extended to one end outside the connecting hole 210 through the connecting groove 411 to separate it into two D-shaped structures. This structure can further enhance the anti-rotation ability of the terminal 400 after filling with potting glue.

[0079] Exemplarily, the connecting column 410 is in a polygonal column shape. For example, the cross section of the connecting column 410 is hexagonal. In this case, the limiting portion is all side surfaces of the connecting column 410 , and the connecting hole 210 is correspondingly configured as a hexagon.

[0080] Exemplarily, the limiting portion is a limiting column protruding from one side of the connecting column 410, and its cross-section is semicircular. A hole corresponding to the limiting column can be set on the connecting hole 210. When the connecting column 410 is inserted into the connecting hole 210, the limiting column is inserted into the corresponding hole to prevent rotation.

[0081] It is understandable that the connecting column 410 , the limiting portion and the connecting hole 210 may also be configured in other shapes, which are not limited in this embodiment.

[0082] In some embodiments, the terminal 400 includes a cylindrical section 430 and a polygonal section 420 that are interconnected. The connecting column 410 is located at the end of the polygonal section 420 that is away from the cylindrical section 430, and the axial projection of the connecting column 410 is located within the polygonal section 420, that is, the cross-sectional dimension of the polygonal section 420 is larger than the cross-sectional dimension of the connecting column 410. When the connecting column 410 is inserted into the connecting hole 210, the polygonal section 420 can be stuck on the connecting hole 210, thereby limiting the insertion depth of the connecting column 410.

[0083] For example, the cross section of the polygonal column segment 420 may be a regular hexagon.

[0084] For example, the cross section of the polygonal column segment 420 may be a regular octagon.

[0085] Of course, the cross section of the polygonal column segment 420 may also be any other polygon, which is not limited in this embodiment.

[0086] After the polygonal column segment 420 is provided, when filling the potting compound, the polygonal column segment 420 can increase the bonding force and friction force with the potting compound compared to the cylindrical portion, thereby further improving the torsional resistance of the terminal 400 .

[0087] Among them, after verification in production experiments, a connecting groove 411 is opened on the connecting column 410 to separate one end of the connecting column 410 into two D-shaped structures, so that the connecting column 410 and the connecting hole 210 are interference fit and soldered together. In combination with the setting of the multi-prism section 420 and the filling of the potting glue, the terminal 400 can provide up to 50N.m of torque support to the opponent while serving as a current carrier.

[0088] This means that the capacitor in this embodiment can not only provide torsional support for the opponent through the connecting column 410, but also reduce the use of adapter devices when assembling with IGBT modules, thereby reducing accessories and lowering the manufacturing cost of the capacitor. At the same time, multiple capacitor cores 100 share the negative busbar 200 and the terminal 400 on the negative busbar 200, which can also effectively improve the integration of the capacitor and reduce the occupied space.

[0089] In addition, after the components are connected, potting glue is filled. After the potting glue is cured, the positions of the components are fixed in the housing 500, and threaded holes can be opened on the terminal posts 400 for assembly in an inverted manner.

[0090] Among them, such as Figure 5 and Figure 7 As shown, the shapes of the negative busbar 200 and the positive busbar 300 can be different. The two can be adapted and adjusted according to the space inside the shell 500 and the layout of other components to reduce the volume of the shell 500. The size of the terminal 400 can also be adjusted according to the position of the negative busbar 200 and the positive busbar 300, which is not limited in this embodiment.

[0091] In some embodiments, see Figure 8 and Figure 9 As shown, the capacitor further includes at least four capacitor groups 600 , and the two poles of each capacitor core 100 are respectively connected in series with at least one capacitor group 600 .

[0092] Specifically, the capacitor group 600 may be composed of one or more safety capacitors. After the capacitor group 600 is installed on the capacitor core 100 , filtering can be performed through the capacitor group 600 .

[0093] Illustratively, the capacitor group 600 may be composed of one or more Y2 capacitors. A Y2 capacitor is a safety capacitor used for connecting a line to ground, which can be used for power supply filtering, removing high-frequency noise, and suppressing electromagnetic interference.

[0094] When the capacitor group 600 is installed, a corresponding number of connecting terminals can be led out from the two poles of the capacitor core 100, with one connecting terminal led out from each pole as a group. There can be a height difference between the two connecting terminals of each group, and an insulating sheet can be set between the two connecting terminals. The two connecting terminals of each group each connect a capacitor group 600 in series.

[0095] In some embodiments, the capacitor bank 600 includes a first capacitor 610 and a second capacitor 620 connected in parallel, and the first capacitor 610 and the second capacitor 620 have different capacitances.

[0096] The first capacitor 610 and the second capacitor 620 are both Y2 capacitors.

[0097] For example, when the capacitance of the capacitor core 100 is 400 uF, the capacitance of the first capacitor 610 is 2.2 nF, and the capacitance of the second capacitor 620 is 22 nF, thereby making the capacitor filtering frequency band wider.

[0098] In some embodiments, as Figure 10 As shown, there are twelve capacitor groups 600 and two capacitor cores 100 . Three capacitor groups 600 are connected in series at the two poles of each capacitor core 100 , and the capacitor groups 600 at the same pole of the capacitor core 100 are arranged in parallel.

[0099] Specifically, each capacitor core 100 is provided with three groups of connection terminals, and the two connection terminals of each group are connected in series with a capacitor group 600, so that the high-frequency leakage inductance of the capacitor is more effectively reduced through the multiple capacitor groups 600.

[0100] In some embodiments, the capacitor further includes a ground busbar 700 , which is provided with two ground electrodes 710 . The capacitor groups 600 connected to the same capacitor core 100 are all connected to the same ground busbar 700 .

[0101] Specifically, one terminal of the capacitor group 600 is connected to a connection terminal, and the other terminal is connected to the ground busbar 700, and the ground busbar 700 has two grounding electrodes 710 for grounding, which effectively reduces the high-frequency leakage inductance of the capacitor, absorbs high-frequency electromagnetic signals, reduces electromagnetic interference (EMI) in the system loop using the capacitor, and improves the EMC (Electromagnetic Compatibility) of the entire system.

[0102] In some embodiments, the capacitor also includes a heat sink 800, which is covered on the side of the capacitor core 100 facing away from the bottom of the shell 500. When filling the potting glue, the heat sink 800 and the capacitor core 100 are fixed together by the potting glue, thereby assisting the capacitor core 100 in dissipating heat through the heat sink 800.

[0103] In addition, at least one through hole 810 can be opened on the heat sink 800. When filling the potting glue, the potting glue can pass through the through hole 810 into the space between the heat sink 800 and the capacitor core 100, so that the heat sink 800 and the capacitor core 100 can be effectively connected.

[0104] The heat dissipation plate 800 may be an aluminum plate or a plate made of other materials, as long as it has good thermal conductivity to assist in heat dissipation. This embodiment does not limit it.

[0105] The present application also provides an electric control system including the capacitor according to any one of the above embodiments. The electric control system may further include an IGBT module and a power supply, wherein the capacitor, the power supply, and the IGBT module are all electrically connected.

[0106] The electronic control system may be applied to automobiles, industrial automation, home appliances, aerospace, medical equipment, etc., and this embodiment does not limit it.

[0107] An embodiment of the present application also provides an electrical device, which includes the above-mentioned electric control system. The electrical equipment referred to here can be related electrical equipment in the fields of industrial automation, automotive electronics, renewable energy, communication equipment, medical equipment, aerospace, lighting systems, etc., and this embodiment does not limit it here.

[0108] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. It is not limited to the precise structure described above and shown in the drawings, and various modifications and variations may be made without departing from the scope of this application. The scope of this application is limited solely by the appended claims.

Claims

1. A capacitor, characterized in that: The invention comprises at least two capacitor cores (100), at least two positive busbars (300) and at least one negative busbar (200), wherein the capacitor cores (100) are connected to the positive busbars (300) in a one-to-one correspondence, and at least two capacitor cores (100) are connected to the same negative busbar (200).

2. The capacitor according to claim 1, wherein It also includes a terminal post (400), and the terminal post (400) is provided on both the positive busbar (300) and the negative busbar (200).

3. The capacitor according to claim 2, wherein: The positive busbar (300) and the negative busbar (200) are both provided with a connection hole (210), one end of the terminal (400) has a connection post (410), the connection post (410) is inserted into the positive busbar (300) or the negative busbar (200) through the connection hole (210), and the connection post (410) is interference-fitted with the connection hole (210).

4. The capacitor according to claim 3, wherein The connecting column (410) is welded to the hole wall of the connecting hole (210).

5. The capacitor according to claim 3, wherein One end of the connecting column (410) extends to the outside of the connecting hole (210), and at least one connecting groove (411) is provided at the end of the connecting column (410) extending to the outside of the connecting hole (210).

6. The capacitor according to claim 5, wherein The extending direction of the connecting groove (411) is the same as the extending direction of the terminal (400).

7. The capacitor according to claim 3, wherein The connecting column (410) has a limiting portion, and the limiting portion is configured to cooperate with the hole wall of the connecting hole (210) when the connecting column (410) is inserted into the connecting hole (210) to limit the relative position of the connecting column (410) and the connecting hole (210).

8. The capacitor according to claim 3, wherein The terminal (400) comprises a cylindrical section (430) and a polygonal column section (420) connected to each other, the connecting column (410) is located at one end of the polygonal column section (420) facing away from the cylindrical section (430), and the axial projection of the connecting column (410) is located within the polygonal column section (420).

9. The capacitor according to any one of claims 1 to 8, characterized in that: It also includes at least four capacitor groups (600), and the two poles of each capacitor core (100) are respectively connected in series with at least one of the capacitor groups (600).

10. The capacitor according to claim 9, wherein The capacitor group (600) comprises a first capacitor (610) and a second capacitor (620) connected in parallel, wherein the first capacitor (610) and the second capacitor (620) have different capacitances.

11. The capacitor according to claim 9, wherein Twelve capacitor groups (600) are provided, two capacitor cores (100) are provided, and three capacitor groups (600) are connected in series at two poles of each capacitor core (100), and the capacitor groups (600) at the same pole of the capacitor core (100) are arranged in parallel.

12. The capacitor according to claim 11, wherein It also includes a grounding busbar (700), wherein the grounding busbar (700) is provided with two grounding electrodes (710), and the capacitor groups (600) connected to the same capacitor core (100) are all connected to the same grounding busbar (700).

13. The capacitor according to any one of claims 1 to 8, characterized in that: The invention also includes a shell (500) and at least two heat dissipation plates (800), wherein the capacitor core (100), the positive busbar (300), and the negative busbar (200) are all located in the shell (500), and the heat dissipation plate (800) is provided on a side of the capacitor core (100) that is away from the bottom of the shell (500). The shell (500) is filled with potting glue, so that the positions of the capacitor core (100), the heat dissipation plate (800), the positive busbar (300), and the negative busbar (200) in the shell (500) are restricted by the potting glue.

14. The capacitor according to claim 13, wherein At least one through hole (810) is provided on the heat dissipation plate (800) so that the potting glue can flow between the heat dissipation plate (800) and the capacitor core (100).

15. An electronic control system, characterized in that: The capacitor comprises the capacitor according to any one of claims 1 to 14.

16. An electrical device, characterized in that: Includes the electronic control system according to claim 15.

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