Vehicle-mounted capacitor

Abstract

The utility model discloses a vehicle-mounted capacitor, which comprises an insulating layer, a capacitor inner core, an input busbar and an output busbar, the output busbar comprises a positive busbar and a negative busbar which are stacked, the positive busbar comprises a positive welding pole plate and a positive alternating current leading-out end, and the negative busbar comprises a negative welding pole plate and a negative alternating current leading-out end; the input busbar comprises a positive direct-current bus end and a negative direct-current bus end, the positive direct-current bus end and the negative direct-current bus end are located on a positive welding pole plate and a negative welding pole plate respectively, the positive welding pole plate and the negative welding pole plate are arranged in a stacked mode, and the positive direct-current bus end and the negative direct-current bus end are arranged in a stacked mode; a first concave groove and a second concave groove are formed in the two opposite sides of the insulating layer respectively, so that the positive pole alternating current leading-out end and the negative pole alternating current leading-out end are arranged in the first concave groove and the second concave groove in the two opposite sides of the insulating layer in a stacked mode respectively. And the riding experience of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a vehicle-mounted capacitor. Background Art

[0002] Regarding EMC testing standards, most domestic automakers currently implement CLASS-3, and automakers represented by BBA generally require CLASS-5. In the future, the limits of EMC testing standards will become more and more stringent.

[0003] The busbar film capacitor is a key component of the new energy vehicle drive motor controller, which generates stray inductance during operation. The stray inductance will cause the voltage across the capacitor to become unstable or fluctuate, thereby interfering with the normal operation of the circuit. The interaction between the stray inductance and the capacitor and other inductive components may also cause resonance or oscillation, and high-frequency noise will occur in the electromagnetic interference circuit, which cannot meet the higher EMC test standards, affecting the user's riding experience. The vehicle environment needs to be improved urgently. Utility Model Content

[0004] The utility model aims to provide a vehicle-mounted capacitor to solve the above-mentioned technical problems.

[0005] To achieve the above object, the technical solution of the utility model is: a vehicle-mounted capacitor, comprising an insulating layer, a capacitor core, an input busbar and an output busbar respectively fixedly connected to the capacitor core;

[0006] The output busbar includes a positive busbar and a negative busbar which are stacked, the positive busbar includes an integrally formed positive welding plate and a positive AC lead-out terminal, and the negative busbar includes an integrally formed negative welding plate and a negative AC lead-out terminal;

[0007] The input busbar includes a positive DC bus terminal and a negative DC bus terminal, the positive DC bus terminal and the negative DC bus terminal are respectively located on a positive welding plate and a negative welding plate, the positive welding plate and the negative welding plate are stacked, and the positive DC bus terminal and the negative DC bus terminal are stacked;

[0008] The first and second recessed grooves are formed on opposite sides of the insulating layer, respectively. The positive AC lead-in terminal is correspondingly installed in the first recessed groove, and the negative AC lead-in terminal is correspondingly installed in the second recessed groove, so that the positive AC lead-in terminal and the negative AC lead-in terminal are respectively stacked on opposite sides of the insulating layer.

[0009] Preferably, the first recessed groove includes a first main groove and a plurality of first extension grooves connected to the first main groove, the first main groove is arranged on the inner side of the top surface of the insulating layer, and the plurality of first extension grooves are arranged on the outer side of the top surface of the insulating layer, the second recessed groove includes a second main groove and a plurality of second extension grooves connected to the second main groove, the second main groove is arranged on the inner side of the bottom surface of the insulating layer, and the plurality of second extension grooves are arranged on the outer side of the bottom surface of the insulating layer, the first main groove and the second main groove are arranged opposite to each other, and the first extension grooves and the second extension grooves are staggered in the length direction of the insulating layer.

[0010] Preferably, a PET film is also included, and the positive DC bus terminal and the negative DC bus terminal, as well as the positive welding electrode plate and the negative welding electrode plate are isolated and insulated by the PET film.

[0011] Preferably, the positive busbar and the negative busbar are respectively provided with hollow holes, and welding convex strips are provided at the hollow holes. The positive busbar and the negative busbar are welded and fixed to the capacitor core through the welding convex strips.

[0012] Preferably, the positive AC lead-out terminal, the negative AC lead-out terminal and the insulating layer are all bent in an L-shape.

[0013] Preferably, a U-shaped convex ridge is formed between two adjacent first extension grooves or between two adjacent second extension grooves.

[0014] Preferably, positioning posts are respectively provided on opposite sides of the insulating layer, positioning holes are provided on the positive AC lead-out terminal and the negative AC lead-out terminal, and the positioning posts and the positioning holes are correspondingly limitedly matched.

[0015] Preferably, the insulating layer is a pps insulating layer.

[0016] Preferably, it also includes a capacitor housing, and the capacitor core is installed in the capacitor housing by epoxy resin sealing.

[0017] Preferably, the positive DC bus terminal and the positive AC lead-out terminal are respectively located on both sides of the length direction of the positive welding electrode plate, and a positive terminal is provided on one side of the width direction of the positive welding electrode plate; the negative DC bus terminal and the negative AC lead-out terminal are respectively located on both sides of the length direction of the negative welding electrode plate, and a negative terminal is provided on one side of the width direction of the negative welding electrode plate.

[0018] The utility model has the following beneficial effects:

[0019] The utility model can enhance the electrical performance of electrical clearance and creepage distance by providing the first and second recessed grooves in the insulating layer to form a concave-convex structure, and effectively reduce the inductance by stacking the positive busbar and the negative busbar over a large area, thereby reducing or eliminating the high-frequency noise of the controller, reducing the noise of the components or the entire vehicle, and realizing noise optimization. After testing, the final simulation result is 6.8nH, so that the new energy passenger car meets the EMC test standards and relevant domestic and international standards, improves the vehicle use environment, and enhances the user's riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded schematic diagram of the utility model;

[0021] Figure 2 It is a top view of the internal structure of the utility model;

[0022] Figure 3 It is a top view of the internal structure of the utility model (I);

[0023] Figure 4 It is a top view of the internal structure of the utility model (II);

[0024] Figure 5 It is a top view of the internal structure of the utility model (three);

[0025] Figure 6 It is a bottom perspective view of the internal structure of the utility model;

[0026] Figure 7 It is a top view of the insulating layer of the utility model;

[0027] Figure 8 This is a bottom perspective view of the insulating layer of the utility model;

[0028] 1 capacitor housing, 2 epoxy resin, 3 capacitor core, 4 insulating layer, 5 positioning column, 6 first recessed groove, 61 first main groove, 62 first extension groove, 7 second recessed groove, 71 second main groove, 72 second extension groove, 8 U-shaped convex ridge, 9 positive DC bus terminal, 10 negative DC bus terminal, 11 positive welding plate, 12 negative welding plate, 13 positive AC lead terminal, 14 negative AC lead terminal, 15 positive terminal, 16 negative terminal, 17 PET film, 18 welding convex strip. DETAILED DESCRIPTION

[0029] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1-8 As shown, as an embodiment of the utility model, a vehicle-mounted capacitor is provided, specifically a bus capacitor for a new energy passenger car motor controller, especially a DC bus capacitor for a new energy passenger car motor controller, which includes an insulating layer 4, a capacitor core 3, an input busbar and an output busbar respectively fixedly connected to the capacitor core 3;

[0033] The output busbar includes a positive busbar and a negative busbar which are stacked, the positive busbar includes an integrally formed positive welding electrode plate 11 and a positive AC lead-out terminal 13, and the negative busbar includes an integrally formed negative welding electrode plate 12 and a negative AC lead-out terminal 14;

[0034] The input busbar includes a positive DC bus terminal 9 and a negative DC bus terminal 10, which are respectively located on a positive welding plate 11 and a negative welding plate 12, and the positive welding plate 11 and the negative welding plate 12 are stacked, and the positive DC bus terminal 9 and the negative DC bus terminal 10 are stacked;

[0035] The first and second recessed grooves 7 are formed on opposite sides of the insulating layer 4, respectively. The positive AC lead-in terminal 13 is correspondingly installed in the first recessed groove 6, and the negative AC lead-in terminal 14 is correspondingly installed in the second recessed groove 7, so that the positive AC lead-in terminal 13 and the negative AC lead-in terminal 14 are respectively stacked on opposite sides of the insulating layer 4.

[0036] Among them, the insulating layer 4 forms a concave-convex structure through the arrangement of the first and second recessed grooves 7, so as to enhance the electrical performance of the electrical clearance and creepage distance, and the technical solution enables a large-area stacking arrangement between the positive busbar and the negative busbar, thereby effectively reducing the inductance, reducing or eliminating the high-frequency noise of the controller, reducing the noise of the components or the entire vehicle, and achieving noise optimization. After testing, the final simulation result is 6.8nH, which enables new energy passenger vehicles to meet the EMC test standards and relevant domestic and foreign standards, improve the vehicle use environment, and enhance the user's riding experience.

[0037] In this embodiment, the first recessed groove 6 includes a first main groove 61 and a plurality of first extension grooves 62 connected to the first main groove 61, the first main groove 61 is arranged on the inner side of the top surface of the insulating layer 4, and the plurality of first extension grooves 62 are arranged on the outer side of the top surface of the insulating layer 4, the second recessed groove 7 includes a second main groove 71 and a plurality of second extension grooves 72 connected to the second main groove 71, the second main groove 71 is arranged on the inner side of the bottom surface of the insulating layer 4, and the plurality of second extension grooves 72 are arranged on the outer side of the bottom surface of the insulating layer 4, the first main groove 61 and the second main groove 71 are arranged opposite to each other, the first extension groove 62 and the second extension groove 72 are staggered in the length direction of the insulating layer 4, the shape structures of the first recessed groove 6 and the second recessed groove 7 are respectively adapted to the shape structures of the positive AC lead-out terminal 13 and the negative AC lead-out terminal 14, and the first extension groove 62 and the second extension groove 72 are staggered in the length direction of the insulating layer 4, so as to ensure that the installation and force of the positive AC lead-out terminal 13 and the negative AC lead-out terminal 14 on the insulating layer 4 are more balanced and stable.

[0038] In this embodiment, a PET film 17 is further included, and the positive DC bus terminal and the negative DC bus terminal, as well as the positive welding electrode plate and the negative welding electrode plate are isolated and insulated by the PET film 17 .

[0039] In this embodiment, hollow holes are respectively provided on the positive busbar and the negative busbar, and a plurality of welding protrusions 18 are arranged side by side at the hollow holes. The positive busbar and the negative busbar are welded and fixed to the capacitor core through the welding protrusions 18 .

[0040] In this embodiment, the positive AC lead-out terminal 13, the negative AC lead-out terminal 14 and the insulating layer 4 are all bent in an L-shape, so as to further improve the assembly stability.

[0041] In this embodiment, a U-shaped convex ridge 8 is formed between two adjacent first extension grooves 62 or between two adjacent second extension grooves 72, so as to further increase the creepage distance and achieve a better insulation effect.

[0042] In this embodiment, positioning columns 5 are respectively provided on the opposite sides of the insulating layer 4, and positioning holes are provided on the positive AC lead-out terminal 13 and the negative AC lead-out terminal 14. The positioning columns 5 correspond to the positioning holes and cooperate with each other. The positioning columns 5 are of an asymmetric structure, which further improves the installation stability of the positive AC lead-out terminal 13 and the negative AC lead-out terminal 14 on the insulating layer 4.

[0043] In this embodiment, the insulating layer 4 is a pps insulating layer, which has excellent high temperature resistance, chemical stability and mechanical properties.

[0044] In this embodiment, a capacitor housing 1 is further included, and a capacitor core 3 is sealed and installed in the capacitor housing 1 by epoxy resin 2 .

[0045] In this embodiment, the positive DC bus terminal 9 and the positive AC lead-out terminal 13 are respectively located on both sides of the length direction of the positive welding electrode plate 11, and a positive terminal 15 is provided on one side of the width direction of the positive welding electrode plate 11; the negative DC bus terminal 10 and the negative AC lead-out terminal 14 are respectively located on both sides of the length direction of the negative welding electrode plate 12, and a negative terminal 16 is provided on one side of the width direction of the negative welding electrode plate 12. This arrangement can reduce the output busbar connection, thereby realizing the integration of the whole machine and achieving the purpose of saving space.

[0046] In summary, the on-board capacitor of the utility model can greatly improve the production and manufacturing process level of capacitors for new energy vehicles, and has a guiding role in the development trend of capacitor miniaturization. The busbar structure has an excellent shielding effect on high-frequency induced eddy currents, making the distribution current consistent. The large-area stacking arrangement of the positive and negative welding plates 12, the positive and negative DC bus terminals 10, and the positive and negative AC lead terminals 14 inside the capacitor reduces the internal parasitic inductance ESL to the minimum value, reduces or eliminates the high-frequency noise of the controller, and achieves noise optimization, so that new energy passenger vehicles meet EMC test standards and relevant domestic and foreign standards, improve the vehicle environment, and enhance the user's riding experience.

[0047] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.

Claims

1. A vehicle-mounted capacitor, characterized in that: It includes an insulating layer, a capacitor core, and an input busbar and an output busbar respectively fixedly connected to the capacitor core; The output busbar includes a positive busbar and a negative busbar which are stacked, the positive busbar includes an integrally formed positive welding plate and a positive AC lead-out terminal, and the negative busbar includes an integrally formed negative welding plate and a negative AC lead-out terminal; The input busbar includes a positive DC bus terminal and a negative DC bus terminal, the positive DC bus terminal and the negative DC bus terminal are respectively located on a positive welding plate and a negative welding plate, the positive welding plate and the negative welding plate are stacked, and the positive DC bus terminal and the negative DC bus terminal are stacked; The first and second recessed grooves are formed on opposite sides of the insulating layer, respectively. The positive AC lead-in terminal is correspondingly installed in the first recessed groove, and the negative AC lead-in terminal is correspondingly installed in the second recessed groove, so that the positive AC lead-in terminal and the negative AC lead-in terminal are respectively stacked on opposite sides of the insulating layer.

2. The vehicle-mounted capacitor according to claim 1, characterized in that: The first recessed groove includes a first main groove and a plurality of first extension grooves connected to the first main groove, the first main groove is arranged on the inner side of the top surface of the insulating layer, and the plurality of first extension grooves are arranged on the outer side of the top surface of the insulating layer, the second recessed groove includes a second main groove and a plurality of second extension grooves connected to the second main groove, the second main groove is arranged on the inner side of the bottom surface of the insulating layer, and the plurality of second extension grooves are arranged on the outer side of the bottom surface of the insulating layer, the first main groove and the second main groove are arranged opposite to each other, and the first extension grooves and the second extension grooves are staggered in the length direction of the insulating layer.

3. The vehicle-mounted capacitor according to claim 1, characterized in that: It also includes a PET film, and the positive DC bus terminal and the negative DC bus terminal, as well as the positive welding plate and the negative welding plate are isolated and insulated by the PET film.

4. The vehicle-mounted capacitor according to claim 1, characterized in that: The positive busbar and the negative busbar are respectively provided with hollow holes, and welding convex strips are provided at the hollow holes. The positive busbar and the negative busbar are welded and fixed to the capacitor core through the welding convex strips.

5. The vehicle-mounted capacitor according to claim 1, characterized in that: The positive AC lead-out terminal, the negative AC lead-out terminal and the insulating layer are all bent in an L-shape.

6. The vehicle-mounted capacitor according to claim 1, characterized in that: A U-shaped convex ridge is formed between two adjacent first extension grooves or between two adjacent second extension grooves.

7. The vehicle-mounted capacitor according to claim 1, characterized in that: Positioning posts are respectively arranged on opposite sides of the insulating layer, and positioning holes are arranged on the positive AC lead-out terminal and the negative AC lead-out terminal, and the positioning posts and the positioning holes are correspondingly limited and matched.

8. The vehicle-mounted capacitor according to claim 1, characterized in that: The insulation layer is a pps insulation layer.

9. The vehicle-mounted capacitor according to claim 1, characterized in that: The invention also comprises a capacitor shell, in which the capacitor core is installed by epoxy resin sealing.

10. The vehicle-mounted capacitor according to claim 1, characterized in that: The positive DC bus terminal and the positive AC lead-out terminal are respectively located on both sides of the length direction of the positive welding electrode plate, and a positive terminal is provided on one side of the width direction of the positive welding electrode plate; the negative DC bus terminal and the negative AC lead-out terminal are respectively located on both sides of the length direction of the negative welding electrode plate, and a negative terminal is provided on one side of the width direction of the negative welding electrode plate.

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