Capacitor

Abstract

The utility model discloses a capacitor, which can shorten the grounding path of a product, reduce the grounding inductance and simplify the insulation design, and comprises a shell, an element to be grounded, a grounding electrode and a filler, a containing cavity is formed in the shell, a flange is arranged on the side face of the shell, and a mounting hole used for being connected with an external grounding point is formed in the flange. A through hole extending in the same direction as the flange is formed in the side wall of the side, corresponding to the flange, of the containing cavity. The through hole penetrates through the shell, an opening in one end of the through hole is in the same direction as an opening of the containing cavity, and an opening in the other end of the through hole is connected to the flange. The to-be-grounded element is matched in the accommodating cavity; one end of the grounding electrode is electrically connected with the to-be-grounded element, and the other end of the grounding electrode extends towards the opening direction of the accommodating cavity, is bent and inserted into the through hole and extends to the mounting hole; the containing cavity is filled with the filler.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor which is beneficial to reducing grounding inductance. Background Art

[0002] With the rapid development of electronic power technology, metallized film capacitors are increasingly used in industrial control, new energy, automotive electronics, rail transit, power grid and other technical fields, and the requirements for capacitor product performance are also getting higher and higher.

[0003] The traditional film capacitor structure is generally composed of a capacitor core (including plates, dielectrics and metal layers sprayed on both end faces), lead electrodes (usually leads, solder tabs or busbars), package shells, filling resins (such as epoxy resins), etc. However, with the development demand for highly integrated controllers in the field of new energy vehicles, more and more designs integrate filter module capacitors (such as Y capacitors, X capacitors and other filter capacitors) into automotive film capacitors.

[0004] When the components integrated inside the capacitor (such as Y capacitors, etc.) need to be grounded, the internal grounding electrode needs to be connected to the external grounding point. Generally, the grounding electrode is wound out from the opening of the shell and locked on the mounting hole of the shell, resulting in a longer path for the grounding electrode and a higher grounding inductance. At the same time, if the grounding electrode is also close to other non-grounded electrodes, attention should also be paid to the insulation design between these electrodes, which makes the insulation design complicated. Utility Model Content

[0005] The utility model aims to provide a capacitor to solve the problems existing in the prior art, shorten the grounding path of the product, reduce the grounding inductance, and simplify the insulation design.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A capacitor comprises a shell, a grounded element, a grounding electrode and a filler; a cavity is arranged in the shell, and a flange is arranged on the side of the shell, and a mounting hole for connecting an external grounding point is arranged on the flange; a through hole extending in the same direction as the flange is arranged on the side wall of the cavity corresponding to the flange; the through hole passes through the shell, one end of which is opened in the same direction as the opening of the cavity, and the other end of which is connected to the flange; the element to be grounded is fitted in the cavity; one end of the grounding electrode is electrically connected to the element to be grounded, and the other end of the grounding electrode extends toward the opening direction of the cavity and is bent to be inserted into the through hole and extends to the mounting hole; the filler is filled in the cavity.

[0008] The side surface of one end of the through hole in the same direction as the opening of the cavity is recessed to form a clearance gap, and the ground electrode is embedded in the clearance gap.

[0009] A plurality of reinforcing ribs are connected between the flange and the side surface of the shell.

[0010] The side wall of the cavity corresponding to one side of the flange is provided with a groove located at the end of the flange; the through hole is provided on the side wall of the groove, and one end opening thereof is connected to the opening of the cavity.

[0011] The element to be grounded is a Y capacitor.

[0012] One end of the grounding electrode is fixed to the surface of the element to be grounded via a capacitor polyester tape.

[0013] The filler is epoxy resin.

[0014] The capacitor further comprises a wiring electrode and a capacitor core; the capacitor core is arranged in the cavity; the wiring electrode is buried in the filler, one end of the wiring electrode is electrically connected to the capacitor core and the other end is exposed in the filler.

[0015] After adopting the above technical solution, the utility model has the following technical effects:

[0016] The utility model designs a through hole on the shell that extends in the same direction as the flange with the mounting hole, and the opening of the through hole is in the same direction as the opening of the cavity. After the element to be grounded is installed in the cavity, the grounding electrode connected to it can be directly led to the through hole and turned over and passed through the through hole to achieve direct connection to the mounting hole, without the need to fold around the surface of the shell for a long distance, which greatly shortens the grounding path of the element to be grounded and reduces its grounding inductance. At the same time, since the through hole is designed on the side wall of the cavity, the design position of the conventional wiring electrode can be avoided, and the grounding electrode is unlikely to contact the wiring electrode, thereby simplifying the insulation design of the product and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of a specific embodiment of the utility model;

[0018] Figure 2 It is an exploded view of a specific embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional view of a specific embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the installation of a specific embodiment of the utility model;

[0021] Description of Figure Numbers:

[0022] 1-housing; 11-cavity; 111-through hole; 112-clearance gap; 113-groove; 12-flange; 121-mounting hole; 13-reinforcement rib; 2-element to be grounded; 3-grounding electrode; 4-filler; 5-wiring electrode; 6-polyester tape; 7-capacitor core. DETAILED DESCRIPTION

[0023] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0024] refer to Figures 1 to 4 As shown, the utility model discloses a capacitor, comprising a housing 1, a component to be grounded 2, a grounding electrode 3 and a filler 4;

[0025] A cavity 11 is provided in the housing 1, and a flange 12 is provided on the side of the housing 1. A mounting hole 121 for connecting an external grounding point is provided on the flange 12. A through hole 111 extending in the same direction as the flange 12 is provided on the side wall of the cavity 11 corresponding to the flange 12. The through hole 111 passes through the housing 1, and one end opening thereof is in the same direction as the opening of the cavity 11, and the other end opening is connected to the flange 12.

[0026] The element to be grounded 2 is fitted into the cavity 11;

[0027] One end of the grounding electrode 3 is electrically connected to the element to be grounded 2, and the other end thereof extends toward the opening direction of the cavity 11 and is bent and inserted into the through hole 111 and extends to the mounting hole 121;

[0028] The filling material 4 is filled into the cavity 11 .

[0029] Through the above solution, the utility model designs a through hole 111 on the housing 1 that extends in the same direction as the flange 12 with the mounting hole 121, and the opening of the through hole 111 is in the same direction as the opening of the cavity 11. Figure 4 After the element 2 to be grounded is installed in the cavity 11, the grounding electrode 3 connected thereto can be directly led to the through hole 111 and turned over to pass through the through hole 111 to be directly connected to the mounting hole 121, without having to fold around the surface of the housing 1 for a long distance, thereby greatly shortening the grounding path of the element 2 to be grounded and reducing its grounding inductance; at the same time, since the through hole 111 is designed on the side wall of the cavity 11, the design position of the conventional wiring electrode 5 can be avoided, and the grounding electrode 3 is kept away from the wiring electrode 5 as much as possible, thereby simplifying the insulation design of the product and reducing the production cost.

[0030] Specific embodiments of the present utility model are shown below.

[0031] The side surface of one end of the through hole 111 in the same direction as the opening of the cavity 11 is recessed to form a clearance notch 112 , and the grounding electrode 3 is embedded in the clearance notch 112 to prevent the grounding electrode 3 from protruding from the surface of the housing 1 .

[0032] A plurality of reinforcing ribs 13 are connected between the flange 12 and the side surface of the housing 1 to enhance the structural strength of the flange 12 and extend the service life of the product.

[0033] The side wall of the cavity 11 corresponding to the flange 12 is provided with a groove 113 located at the end of the flange 12; the through hole 111 is provided on the side wall of the groove 113, and one end of the through hole 111 is connected to the opening of the cavity 11. This design makes it difficult for the filling material 4 to flow into the through hole 111 and overflow to the surface of the housing 1 when potting.

[0034] The above-mentioned element to be grounded 2 is a Y capacitor.

[0035] One end of the grounding electrode 3 is fixed to the surface of the element to be grounded 2 through a capacitor polyester tape 6 to achieve relative fixation with the element to be grounded 2.

[0036] The filler 4 is epoxy resin.

[0037] The utility model further comprises a wiring electrode 5 and a capacitor core 7; the capacitor core 7 is arranged in the cavity 11; the wiring electrode 5 is buried in the filler 4, one end of the wiring electrode 5 is electrically connected to the capacitor core 7, and the other end is exposed from the filler 4.

[0038] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A capacitor, characterized in that: It includes the shell, the element to be grounded, the grounding electrode and the filling material; A cavity is provided in the shell, and a flange is provided on the side of the shell, and a mounting hole for connecting an external grounding point is provided on the flange; a through hole extending in the same direction as the flange is provided on the side wall of the cavity corresponding to the flange; the through hole passes through the shell, and one end opening thereof is in the same direction as the opening of the cavity, and the other end opening is connected to the flange; The element to be grounded is fitted in the cavity; One end of the grounding electrode is electrically connected to the element to be grounded, and the other end thereof extends toward the opening direction of the cavity and is bent and inserted into the through hole and extends to the mounting hole; The filler is filled in the cavity.

2. The capacitor according to claim 1, wherein: The side surface of one end of the through hole in the same direction as the opening of the cavity is recessed to form a clearance gap, and the ground electrode is embedded in the clearance gap.

3. The capacitor according to claim 1, wherein: A plurality of reinforcing ribs are connected between the flange and the side surface of the shell.

4. The capacitor according to claim 1, wherein: The side wall of the cavity corresponding to one side of the flange is provided with a groove located at the end of the flange; the through hole is provided on the side wall of the groove, and one end opening thereof is connected to the opening of the cavity.

5. The capacitor according to claim 1, wherein: The element to be grounded is a Y capacitor.

6. The capacitor according to claim 1, wherein: One end of the grounding electrode is fixed to the surface of the element to be grounded via a capacitor polyester tape.

7. The capacitor according to claim 1, wherein: The filler is epoxy resin.

8. The capacitor according to claim 1, wherein: It also includes a wiring electrode and a capacitor core; the capacitor core is arranged in the cavity; the wiring electrode is buried in the filler, one end of the wiring electrode is electrically connected to the capacitor core, and the other end is exposed in the filler.

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