Film capacitor for automobile

Abstract

The utility model discloses a film capacitor for an automobile, which comprises a plastic shell, a hollow part is arranged at the bottom of an inner cavity of the plastic shell, the hollow part is sealed by installing a cooling metal plate, one side of the plastic shell is provided with a side opening communicated with the inner cavity, and a capacitor core, a busbar and an insulating sheet are arranged in the inner cavity of the plastic shell. The insulating sheet, the busbar and the capacitor core are sequentially stacked on the cooling metal plate from bottom to top, one side, close to the side opening of the plastic shell, of the busbar is electrically connected with a leading-out terminal, and the leading-out terminal extends out of the plastic shell from the side opening. The busbars are intensively arranged at the position close to the cooling metal plate, concentrated cooling of heat of the capacitor is facilitated, the leading-out terminals do not pass through the cooling metal plate, and integrity of the cooling metal plate is kept.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology for new energy vehicles, and specifically to a thin-film capacitor for automobiles. Background Technology

[0002] Patent CN 208570361U discloses a high heat dissipation film capacitor for electric vehicles. The capacitor's leads extend out of the plastic shell from two directions. Some of the leads need to pass through a cooling metal plate, which requires the cooling metal plate to have perforations for the leads to pass through. This reduces the area of ​​the cooling metal plate, but there is still room for improvement in heat dissipation. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a thin-film capacitor for automobiles, which mainly solves the problems of unreasonable structural design and insufficient heat dissipation effect of existing capacitors.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A film capacitor for automobiles includes a plastic shell with a hollowed-out portion at the bottom of the inner cavity. The hollowed-out portion is closed by a cooling metal plate. A side opening communicating with the inner cavity is provided on one side of the plastic shell. A capacitor core, busbar, and insulating sheet are installed in the inner cavity of the plastic shell. The insulating sheet, busbar, and capacitor core are stacked sequentially from bottom to top on the cooling metal plate. A lead terminal is electrically connected to the side of the busbar near the side opening of the plastic shell, and the lead terminal extends out of the plastic shell from the side opening.

[0006] Preferably, the side opening is provided on one side of the plastic shell along its length direction, and the capacitor core is formed by arranging multiple vertically arranged single cores in a row along the length direction of the plastic shell. The length direction of the capacitor core is consistent with the length direction of the plastic shell, and the busbar is welded to both sides of the length direction of the capacitor core.

[0007] Preferably, the busbar includes a first busbar and a second busbar stacked on top of each other, with insulating paper between the first busbar and the second busbar, and the first busbar and the second busbar are respectively welded to both sides of the capacitor core along its length.

[0008] Preferably, a row of heat dissipation grooves is provided on the plastic shell, the heat dissipation grooves are arranged on the side of the plastic shell facing away from the side opening, the opening of the heat dissipation grooves faces upward, and the heat dissipation grooves are not connected to the inner cavity of the plastic shell.

[0009] Preferably, the side opening of the plastic shell is sealed by filling with sealant.

[0010] One or more technical solutions provided by this utility model have at least one of the following beneficial effects:

[0011] 1. The insulating sheet, busbar, and upright capacitor core are stacked sequentially from bottom to top on the cooling metal plate. The leads are electrically connected to the side of the busbar closest to the side opening. In other words, the busbars are concentrated near the cooling metal plate, which is beneficial for concentrated cooling of the capacitor heat. The leads do not pass through the cooling metal plate, maintaining the integrity of the cooling metal plate (eliminating the need for terminal clearance holes, which is equivalent to increasing the area of ​​the cooling metal plate) and enhancing the heat dissipation effect.

[0012] 2. The length direction of the capacitor core is consistent with the length direction of the plastic shell. A side opening is provided on one side of the plastic shell along its length direction. The lead-out terminals are electrically connected to the side of the busbar near the side opening of the plastic shell, which facilitates the unobstructed installation of the capacitor core and busbar into the plastic shell.

[0013] 3. The capacitor core is composed of multiple vertically arranged single cores arranged in a row along the length of the plastic shell. The busbar is welded to both sides of the capacitor core along the length of the shell. The capacitor core and the busbar are stacked, so the capacitor core and the busbar occupy a small width in the plastic shell. The stacking of each part makes the structure compact, which is conducive to designing a narrow plastic shell.

[0014] 4. Adding a row of heat dissipation grooves to the plastic shell helps improve the heat dissipation effect of the capacitor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an automotive thin-film capacitor according to an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of an automotive film capacitor that is not encapsulated with sealant;

[0017] Figure 3 This is an assembly diagram of the capacitor core and busbar in this embodiment;

[0018] Figure 4 yes Figure 1 An exploded view of a film capacitor for automotive applications. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 this utility model and simplifying the description, and do not 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 limitations on this utility model.

[0021] likeFigures 1 to 4 As shown, this embodiment discloses a film capacitor for automobiles, including a plastic shell 1. A capacitor core 4, a busbar, and an insulating sheet 6 are installed inside the cavity of the plastic shell 1. A side opening 7 is provided on one side of the plastic shell 1 along its length for inserting the capacitor core 4, busbar, and insulating sheet 6 into the cavity of the plastic shell 1. The side opening 7 of the plastic shell 1 is sealed with sealant 8. A hollowed-out portion is provided at the bottom of the cavity of the plastic shell 1, which is closed by installing a cooling metal plate 9. The capacitor core 4 is vertically positioned above the busbar. Specifically, the capacitor core 4 is composed of multiple vertically positioned single cores arranged in a row along the length of the plastic shell 1, with the length direction of the capacitor core 4 consistent with the length direction of the plastic shell 1. The busbar includes a first busbar 51 and a second busbar 52 stacked vertically, with insulating paper 53 between them. The first busbar 51 and the second busbar 52 are welded to both sides of the capacitor core 4 along its length. Both the first busbar 51 and the second busbar 52 are connected to lead-out terminals 3, and all lead-out terminals 3 are located on the same side of the busbar. Specifically, the lead-out terminals 3 are connected to the side of the busbar closest to the opening 7 of the plastic shell 1, and extend outside the plastic shell 1 from the opening 7. The busbar is in close contact with the cooling metal plate 9, and an insulating sheet 6 is provided between the busbar and the cooling metal plate 9. The concentrated arrangement of the busbars near the cooling metal plate 9 facilitates concentrated cooling of the capacitor.

[0022] The insulating sheet 6, busbar, and upright capacitor core 4 are stacked sequentially from bottom to top on the cooling metal plate 9. The lead-out terminal 3 is electrically connected to the side of the busbar near the side opening 7. In other words, the busbar is concentrated near the cooling metal plate 9, which is beneficial for concentrated cooling of capacitor heat. The lead-out terminal 3 does not pass through the cooling metal plate 9, maintaining the integrity of the cooling metal plate 9 (eliminating the need for terminal clearance holes, which is equivalent to increasing the area of ​​the cooling metal plate 9), thus enhancing the heat dissipation effect.

[0023] The capacitor cores 4 are arranged in a row along the length of the plastic shell 1. A side opening 7 is provided on one side of the plastic shell 1 along the length. The lead-out terminal 3 is located on the side of the busbar close to the side opening 7 of the plastic shell 1. This design makes it easy to insert the capacitor cores 4 and the busbar into the plastic shell 1 without obstruction through the side opening 7, thereby improving the assembly speed and facilitating automated assembly.

[0024] The insulating sheet 6, busbar, and upright capacitor core 4 are stacked sequentially from bottom to top on the cooling metal plate 9. This helps reduce the width occupied by the insulating sheet 6, busbar, and upright capacitor core 4, meaning the inner width of the plastic shell 1 is relatively small. Preferably, a row of heat dissipation grooves 2 is provided on the plastic shell 1. The heat dissipation grooves 2 are arranged on the side of the plastic shell 1 facing away from the side opening 7, with the openings of the heat dissipation grooves 2 facing upwards. The heat dissipation grooves 2 are not connected to the inner cavity of the plastic shell 1. Since the inner cavity width used to install the capacitor core 4 and busbar is small (close to the width of the capacitor core 4), there is still enough space to add an additional row of heat dissipation grooves 2. The heat dissipation grooves 2 are close to the sides of the capacitor core 4 and busbar, which helps to dissipate heat from the capacitor core 4 and busbar, enhancing the heat dissipation effect. Furthermore, the width of the plastic shell 1 after adding the heat dissipation grooves 2 is still not very large, making it suitable for the narrow installation space in automobiles.

[0025] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A film capacitor for automotive applications, characterized in that, The device includes a plastic shell with a hollowed-out section at the bottom of its inner cavity. The hollowed-out section is sealed by a cooling metal plate. A side opening communicating with the inner cavity is provided on one side of the plastic shell. A capacitor core, busbar, and insulating sheet are installed in the inner cavity of the plastic shell. The insulating sheet, busbar, and capacitor core are stacked sequentially on the cooling metal plate from bottom to top. The side of the busbar near the side opening of the plastic shell is electrically connected to a lead-out terminal, which extends out of the plastic shell from the side opening.

2. The automotive film capacitor according to claim 1, characterized in that, The side opening is provided on one side of the plastic shell along its length. The capacitor core is composed of multiple vertically arranged single cores arranged in a row along the length of the plastic shell. The length direction of the capacitor core is consistent with the length direction of the plastic shell. The busbar is welded to both sides of the capacitor core along its length.

3. The automotive film capacitor according to claim 2, characterized in that, The busbar includes a first busbar and a second busbar stacked on top of each other, with insulating paper between the first busbar and the second busbar. The first busbar and the second busbar are respectively welded to both sides of the capacitor core along its length.

4. The automotive film capacitor according to claim 2 or 3, characterized in that, A row of heat dissipation slots is provided on the plastic shell. The heat dissipation slots are arranged on the side of the plastic shell that faces away from the side opening. The openings of the heat dissipation slots face upwards and are not connected to the inner cavity of the plastic shell.

5. The automotive film capacitor according to claim 1, characterized in that, The side openings of the plastic shell are sealed by filling with sealant.

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