Capacitor applied to automobile inverter

Abstract

The utility model relates to the technical field of automobile inverter capacitor and disclose the capacitor for being applied to automobile inverter, it includes the plastic insulating shell, the plastic insulating shell is provided with the heat conduction layer, the heat conduction layer is provided with the aluminium shell, the aluminium shell inner bottom is provided with the gasket, the gasket upper end is provided with the element, the element is three -layer structure winding and becomes, the three -layer structure of element includes anode foil, electrolytic paper and cathode foil, the electrolytic paper is the middle interlayer of anode foil and cathode foil, the element periphery is wound with adhesive tape, is located the aluminium shell in element top and is provided with the apron, the apron middle part one side is provided with the positive terminal. Through setting up heat conduction layer, can conduct the heat in the capacitor outward, be favorable to the heat dissipation of capacitor, and heat conduction layer is between aluminium shell structure and plastic insulating layer structure, will not cause the influence to the internal structure of capacitor.

Description

Technical Field

[0001] This utility model belongs to the field of automotive inverter capacitor technology, specifically a capacitor applied to automotive inverters. Background Technology

[0002] An automotive inverter is a power converter that can convert DC 12V direct current into AC 220V alternating current, the same as the mains power, for use with general electrical appliances. It can provide great convenience to people. Automotive inverters use capacitors to store electrical energy.

[0003] However, the heat dissipation performance of the existing closed structure of capacitors used in automotive inverters is poor, and the heat of the capacitor is difficult to conduct out quickly. Long-term operation will affect the safety and stability of automotive inverters. Therefore, a capacitor for automotive inverters is proposed here. Utility Model Content

[0004] In response to the above situation and to overcome the shortcomings of the existing technology, this utility model provides a capacitor for use in automotive inverters, which effectively solves the problem that dust particles and garbage in the air can cover the surface of the transmission chain in current chain-driven electric window openers, and that it is difficult to adjust the opening distance according to different window sizes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a capacitor applied to an automotive inverter, comprising a plastic insulating shell, a heat-conducting layer disposed inside the plastic insulating shell, an aluminum shell disposed inside the heat-conducting layer, a gasket disposed at the bottom end of the aluminum shell, and a core disposed at the top end of the gasket. The core is formed by winding a three-layer structure, the three-layer structure of the core including an anode foil, electrolytic paper, and a cathode foil, the electrolytic paper being the intermediate layer between the anode foil and the cathode foil. The core is wrapped with tape, and a cover plate is disposed inside the aluminum shell above the core. A positive terminal is disposed on one side of the middle of the cover plate, and a negative terminal is disposed on the cover plate on one side of the positive terminal. A first conductive foil strip is disposed at the lower end of the positive terminal, the lower end of the first conductive foil strip being connected to the anode foil. A second conductive foil strip is disposed at the lower end of the negative terminal, the lower end of the second conductive foil strip being connected to the cathode foil.

[0006] Preferably, the outer wall of the thermally conductive layer is bonded to the inner wall of the plastic insulating shell, the outer wall of the aluminum shell is bonded to the inner wall of the thermally conductive layer, and the lower end of the gasket is bonded to the inner bottom of the aluminum shell. The thermally conductive layer is a thermal interface material made of silicone rubber as the base material and alumina and boron nitride thermally conductive fillers. It is a flexible material with good flexibility, fit, sealing and thermal conductivity, and can play the roles of shock absorption, insulation and sealing. The thermally conductive layer can conduct heat from inside the capacitor to the outside, which is beneficial to the heat dissipation of the capacitor.

[0007] Preferably, the lower end of the element overlaps with the upper end of the gasket, the cover plate is connected to the upper inner wall of the aluminum shell through a slot, the upper end of the cover plate is wrapped by the heat-conducting layer and the plastic insulating shell, the electrolytic paper is the insulating medium between the anode foil and the cathode foil, and the heat of the cover plate can also be conducted to the outside of the capacitor by the heat-conducting layer.

[0008] Preferably, both the positive and negative terminals are bonded to the cover plate, and the lower end of the positive terminal is welded to the upper end of the first guide foil strip.

[0009] Preferably, the lower end of the first conductive foil strip is clamped between the anode foil and the electrolytic paper, and the first conductive foil strip is a conductive structure between the positive terminal and the anode foil.

[0010] Preferably, the lower end of the negative terminal is welded to the lower end of the second conductive foil strip, and the lower end of the second conductive foil strip is clamped between the cathode foil and the electrolytic paper. The second conductive foil strip is a conductive structure between the negative terminal and the cathode foil. When a voltage is applied between the positive terminal and the negative terminal, the capacitor will store charge.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this capacitor used in automotive inverters, a heat-conducting layer is provided to conduct heat outwards, which is beneficial for heat dissipation. Furthermore, the heat-conducting layer is located between the aluminum shell structure and the plastic insulation layer structure, so it will not affect the internal structure of the capacitor. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front sectional view of the present invention; Figure 3 This is a schematic diagram of the structure of the element in this utility model; Figure 4 This utility model Figure 2 A magnified view of a section at point A in the middle; In the diagram: 1. Plastic insulating shell; 2. Thermal conductive layer; 3. Aluminum shell; 4. Gasket; 5. Element; 6. Anode foil; 7. Electrolytic paper; 8. Cathode foil; 9. Adhesive tape; 10. Cover plate; 11. Positive terminal; 12. Negative terminal; 13. First conductive foil strip; 14. Second conductive foil strip. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0014] In this embodiment, by Figure 1-4 The present invention includes a plastic insulating shell 1, a heat-conducting layer 2 inside the plastic insulating shell 1, an aluminum shell 3 inside the heat-conducting layer 2, a gasket 4 at the bottom of the aluminum shell 3, and a core 5 at the top of the gasket 4. The core 5 is a three-layer structure wound together, including an anode foil 6, an electrolytic paper 7, and a cathode foil 8. The electrolytic paper 7 is the middle interlayer between the anode foil 6 and the cathode foil 8. Adhesive tape 9 is wrapped around the core 5. A cover plate 10 is provided inside the aluminum shell 3 above the core 5. A positive terminal 11 is provided on one side of the middle of the cover plate 10. A negative terminal 12 is provided on the cover plate 10 on the side of the positive terminal 11. A first guide foil strip 13 is provided at the lower end of the positive terminal 11, and the lower end of the first guide foil strip 13 is connected to the anode foil 6. A second guide foil strip 14 is provided at the lower end of the negative terminal 12, and the lower end of the second guide foil strip 14 is connected to the cathode foil 8.

[0015] The outer wall of the heat-conducting layer 2 is bonded to the inner wall of the plastic insulating shell 1, the outer wall of the aluminum shell 3 is bonded to the inner wall of the heat-conducting layer 2, and the lower end of the gasket 4 is bonded to the inner bottom of the aluminum shell 3. The heat-conducting layer 2 is a thermal interface material made of silicone rubber as the base material and alumina and boron nitride thermally conductive fillers. It is a flexible material with good flexibility, fit, sealing and thermal conductivity. It can play the roles of shock absorption, insulation and sealing. The heat-conducting layer 2 can conduct the heat inside the capacitor to the outside, which is conducive to the heat dissipation of the capacitor. The lower end of the element 5 overlaps with the upper end of the gasket 4. The cover plate 10 is connected to the upper inner wall of the aluminum shell 3 through a slot. The upper end of the cover plate 10 is wrapped by the heat-conducting layer 2 and the plastic insulating shell 1. The electrolytic paper 7 is the insulating medium between the anode foil 6 and the cathode foil 8. The heat of the cover plate 10 can also be conducted to the outside of the capacitor by the heat-conducting layer 2.

[0016] The positive terminal 11 and the negative terminal 12 are both bonded to the cover plate 10. The lower end of the positive terminal 11 is welded to the upper end of the first conductive foil 13. The lower end of the first conductive foil 13 is clamped between the anode foil 6 and the electrolytic paper 7. The first conductive foil 13 is the conductive structure between the positive terminal 11 and the anode foil 6.

[0017] The lower end of the negative terminal 12 is welded to the lower end of the second conductive foil 14. The lower end of the second conductive foil 14 is clamped between the cathode foil 8 and the electrolytic paper 7. The second conductive foil 14 is a conductive structure between the negative terminal 12 and the cathode foil 8. When a voltage is applied between the positive terminal 11 and the negative terminal 12, the capacitor will store charge.

[0018] Working principle: The first conductive foil 13 is the conductive structure between the positive terminal 11 and the anode foil 6, and the second conductive foil 14 is the conductive structure between the negative terminal 12 and the cathode foil 8. When a voltage is applied between the positive terminal 11 and the negative terminal 12, the capacitor will store charge. The tape 9 can reinforce the structure of the element 5, making the combined structure of the anode foil 6, electrolytic paper 7 and cathode foil 8 more stable, and also making the element 5 fit better with the internal structure of the capacitor. The heat-conducting layer 2 can conduct the heat inside the capacitor outward, which is beneficial to the heat dissipation of the capacitor. The heat-conducting layer 2 is located between the aluminum shell 3 structure and the plastic insulation layer structure, and will not affect the internal structure of the capacitor.

[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A capacitor used in an automotive inverter, comprising a plastic insulating shell (1), characterized in that: A heat-conducting layer (2) is provided inside the plastic insulating shell (1), and an aluminum shell (3) is provided inside the heat-conducting layer (2). A gasket (4) is provided at the bottom of the aluminum shell (3), and a core (5) is provided at the top of the gasket (4). The core (5) is a three-layer structure wound together. The three-layer structure of the core (5) includes an anode foil (6), an electrolytic paper (7), and a cathode foil (8). The electrolytic paper (7) is the middle interlayer between the anode foil (6) and the cathode foil (8). The core (5) is wrapped with tape (9) around its periphery. (5) A cover plate (10) is provided inside the aluminum shell (3) above. A positive terminal (11) is provided on one side of the middle part of the cover plate (10). A negative terminal (12) is provided on the cover plate (10) on one side of the positive terminal (11). A first guide foil strip (13) is provided at the lower end of the positive terminal (11). The lower end of the first guide foil strip (13) is connected to the anode foil (6). A second guide foil strip (14) is provided at the lower end of the negative terminal (12). The lower end of the second guide foil strip (14) is connected to the cathode foil (8).

2. The capacitor used in an automotive inverter according to claim 1, characterized in that: The outer wall of the heat-conducting layer (2) is bonded to the inner wall of the plastic insulating shell (1), the outer wall of the aluminum shell (3) is bonded to the inner wall of the heat-conducting layer (2), and the lower end of the gasket (4) is bonded to the inner bottom end of the aluminum shell (3). The heat-conducting layer (2) is a thermal interface material made of silicone rubber as the base material and aluminum oxide and boron nitride thermally conductive fillers.

3. The capacitor used in an automotive inverter according to claim 1, characterized in that: The lower end of the element (5) overlaps with the upper end of the gasket (4), the cover plate (10) is connected to the upper inner wall of the aluminum shell (3) through a slot, and the upper end of the cover plate (10) is wrapped by the heat-conducting layer (2) and the plastic insulating shell (1).

4. The capacitor used in an automotive inverter according to claim 1, characterized in that: Both the positive terminal (11) and the negative terminal (12) are bonded to the cover plate (10), and the lower end of the positive terminal (11) is welded to the upper end of the first guide foil strip (13).

5. The capacitor for use in an automotive inverter according to claim 1, characterized in that: The lower end of the first guide foil (13) is clamped between the anode foil (6) and the electrolytic paper (7).

6. The capacitor for use in an automotive inverter according to claim 1, characterized in that: The lower end of the negative terminal (12) is welded to the lower end of the second conductive foil (14), and the lower end of the second conductive foil (14) is clamped between the cathode foil (8) and the electrolytic paper (7).

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