Capacitor

Abstract

The utility model discloses a capacitor, which realizes multi-channel heat conduction and heat dissipation inside the capacitor, and improves the heat dissipation performance and operation stability of the capacitor. The capacitor comprises a first busbar, a second busbar, a capacitor inner core and a first insulating film; the first busbar comprises a first busbar body, and a first leading-out terminal and a first connecting terminal which are connected to the side edge of the first busbar body; the second busbar comprises a second busbar body and a second leading-out terminal connected to the side edge of the second busbar body; the second busbar body and the first busbar body are sequentially stacked on the upper surface of the capacitor inner core, and the second busbar body is electrically connected with the upper surface of the capacitor inner core; at least two first connecting terminals connected with the first busbar body are bent along different side surfaces of the capacitor inner core, then are wound to the lower surface of the capacitor inner core, and are electrically connected with the lower surface of the capacitor inner core; and a first insulating film is arranged between the first busbar and the second busbar to realize electrical insulation.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor capable of realizing multi-channel heat dissipation. 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. The requirements for application performance in various fields are increasing, and the requirements for the thermal performance of the capacitors themselves are also getting higher and higher.

[0003] At present, capacitors in the industry generally only consider setting up water cooling in a certain area outside the capacitor for heat dissipation. However, for some working conditions with relatively high thermal performance requirements, external water cooling alone cannot meet the relevant requirements and regulations, and may even eventually lead to product failure due to unsatisfactory thermal performance. It is necessary to optimize the capacitor itself, especially the internal heat dissipation capacity. Utility Model Content

[0004] The purpose of the utility model is to provide a capacitor to solve the problems existing in the prior art, realize multi-channel heat conduction and heat dissipation inside the capacitor, and improve the heat dissipation performance and operation stability of the capacitor.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A capacitor comprises a first busbar and a second busbar, a capacitor core and a first insulating film; the first busbar comprises a first busbar body, and a first lead-out terminal and a first connecting terminal connected to the side of the first busbar body; the second busbar comprises a second busbar body, and a second lead-out terminal connected to the side of the second busbar body; the second busbar body and the first busbar body are sequentially stacked on the upper surface of the capacitor core, and the second busbar body is electrically connected to the upper surface of the capacitor core; at least two first connecting terminals connected to the first busbar body are bent along different side surfaces of the capacitor core and then wound around to the lower surface of the capacitor core, and are electrically connected to the lower surface of the capacitor core; a first insulating film is arranged between the first busbar and the second busbar to achieve electrical insulation.

[0007] A second connecting terminal is arranged on the side of the second busbar body at a position corresponding to at least one of the first connecting terminals; the second connecting terminal is bent from the side of the second busbar body toward the side of the capacitor core, and extends in a direction parallel to the side of the capacitor core without contacting the capacitor core, and the second connecting terminal overlaps with the corresponding first connecting terminal.

[0008] Preferably, a first extending portion is provided at a position of the first insulating film corresponding to the second connecting terminal, and the first extending portion is located between the second connecting terminal and the first connecting terminal.

[0009] Preferably, a second extending portion is provided at a position of the first insulating film corresponding to the first connecting terminal, and the second extending portion is located between the first connecting terminal and a side surface of the capacitor core.

[0010] The first lead terminal and the second lead terminal are parallel to each other; the first insulating film is provided with a third extension portion at positions corresponding to the first lead terminal and the second lead terminal, and the third extension portion is located between the first lead terminal and the second lead terminal.

[0011] The capacitor also includes a capacitor shell for accommodating the capacitor core, and the capacitor shell is filled with insulating filler; the first busbar body, the second busbar body, and the capacitor core are all buried in the insulating filler, and the first lead terminal and the second lead terminal are exposed from the insulating filler.

[0012] Preferably, the capacitor further comprises a first heat sink and a second heat sink, wherein the first heat sink is insulated and stacked on the upper surface of the first busbar body, and its upper surface is exposed to the insulating filler; and the second heat sink is arranged on the lower surface of the capacitor housing.

[0013] Preferably, a second insulating film is provided between the first heat sink and the first busbar body, and a third insulating film is provided between the second heat sink and the lower surface of the capacitor core.

[0014] After adopting the above technical solution, the utility model has the following technical effects:

[0015] The utility model can increase the overlapping area between the first busbar and the second busbar by stacking and arranging the first busbar body of the first busbar and the second busbar body of the second busbar on the upper surface of the capacitor core, thereby reducing the inductance of the capacitor; secondly, the overlapping area between the capacitor core and the second busbar body is increased, and at the same time, the first busbar body is also connected to a plurality of first connecting terminals wound around the side of the capacitor core, and the parts of the first connecting terminals perpendicular to the surfaces of the capacitor core form a plurality of heat dissipation channels, thereby optimizing the heat dissipation performance of the capacitor core; furthermore, the lower surface of the capacitor core is electrically connected to the first busbar body through the plurality of first connecting terminals, so as to achieve the effect of current shunting and reduce the heating efficiency of a single first connecting terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a specific embodiment of the utility model Figure 1 ;

[0017] Figure 2 A three-dimensional diagram of a specific embodiment of the utility model Figure 2 ;

[0018] Figure 3 Decomposition of a specific embodiment of the utility model Figure 1 ;

[0019] Figure 4 Decomposition of a specific embodiment of the utility model Figure 2 ;

[0020] Figure 5 A top view of a specific embodiment of the utility model;

[0021] Figure 6 for Figure 5 Sectional view in the AA direction;

[0022] Figure 7 for Figure 5 Cross-sectional view in the BB direction;

[0023] Description of Figure Numbers:

[0024] 1-first busbar; 11-first busbar body; 12-first lead terminal; 13-first connecting terminal; 2-second busbar; 21-second busbar body; 22-second lead terminal; 23-second connecting terminal; 3-capacitor core; 4-first insulating film; 41-first extension portion; 42-second extension portion; 43-third extension portion; 5-capacitor housing; 6-insulating filler; 7-first heat sink; 8-second heat sink; 9-second insulating film; 10-third insulating film. DETAILED DESCRIPTION

[0025] 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.

[0026] refer to Figures 1 to 7 As shown, the utility model discloses a capacitor, comprising a first busbar 1 and a second busbar 2, a capacitor core 3 and a first insulating film 4;

[0027] The first busbar 1 includes a first busbar body 11, and a first lead terminal 12 and a first connection terminal 13 connected to the side of the first busbar body 11; the second busbar 2 includes a second busbar body 21, and a second lead terminal 22 connected to the side of the second busbar body 21; the first lead terminal 12 and the second lead terminal 22 are both used to connect external electrical equipment;

[0028] The second busbar body 21 and the first busbar body 11 are sequentially stacked on the upper surface of the capacitor core 3, and the second busbar body 21 is electrically connected to the upper surface of the capacitor core 3 through a number of pins (conventional technology, not shown in the figure); at least two first connection terminals 13 connected to the first busbar body 11 are bent along different sides of the capacitor core 3 and then wound to the lower surface of the capacitor core 3, and are electrically connected to the lower surface of the capacitor core 3 through a number of pins;

[0029] A first insulating film 4 is provided between the first busbar 1 and the second busbar 2 to achieve electrical insulation.

[0030] Through the above scheme, the utility model can increase the overlapping area between the first busbar 1 and the second busbar 2 by stacking and arranging the first busbar body 11 of the first busbar 1 and the second busbar body 21 of the second busbar 2 on the upper surface of the capacitor core 3, thereby reducing the inductance of the capacitor; secondly, the overlapping area between the capacitor core 3 and the second busbar body 21 is increased, and at the same time, the first busbar body 11 is also connected to a plurality of first connecting terminals 13 wound around the side of the capacitor core 3, and the parts of the first connecting terminals 13 perpendicular to the surfaces of the capacitor core 3 form a plurality of heat dissipation channels, thereby optimizing the heat dissipation performance of the capacitor core 3; furthermore, the lower surface of the capacitor core 3 is electrically connected to the first busbar body 11 through a plurality of first connecting terminals 13, which can achieve the effect of current diversion and reduce the heating efficiency of a single first connecting terminal 13.

[0031] Specific embodiments of the present utility model are shown below.

[0032] A second connecting terminal 23 is provided on the side of the second busbar body 21 corresponding to the position of at least one of the first connecting terminals 13; the second connecting terminal 23 is bent from the side of the second busbar body 21 to the side of the capacitor core 3, and extends in a direction parallel to the side of the capacitor core 3 without contacting the capacitor core 3, and the second connecting terminal 23 overlaps with the corresponding first connecting terminal 13, which can further reduce the inductance.

[0033] Furthermore, the first insulating film 4 is provided with a first extension portion 41 at a position corresponding to the second connection terminal 23 , and the first extension portion 41 is located between the second connection terminal 23 and the first connection terminal 13 , and plays a role of electrical insulation. Generally, the extension length of the first extension portion 41 is not shorter than that of the second connection terminal 23 .

[0034] At the same time, the first insulating film 4 is provided with a second extension portion 42 at a position corresponding to the first connecting terminal 13 (specifically, the first connecting terminal 13 at a corresponding position where the second connecting terminal 23 is not provided), and the second extension portion 42 is located between the first connecting terminal 13 and the side of the capacitor core 3, which can prevent the non-electrical connection part of the first connecting terminal 13 from contacting the capacitor core 3.

[0035] The above-mentioned first lead terminal 12 and the second lead terminal 22 are parallel to each other, which can further increase the overlapping area of ​​the first busbar 1 and the second busbar 2 and increase the inductance; correspondingly, the above-mentioned first insulating film 4 is provided with a third extension portion 43 at the position corresponding to the first lead terminal 12 / second lead terminal 22, and the third extension portion 43 is located between the first lead terminal 12 and the second lead terminal 22 to play a role of electrical insulation.

[0036] The utility model also includes a capacitor housing 5 for accommodating a capacitor core 3, wherein the capacitor housing 5 is filled with an insulating filler 6 (such as epoxy resin); the first busbar body 11, the second busbar body 21, and the capacitor core 3 are all buried in the insulating filler 6, and the first lead terminal 12 and the second lead terminal 22 are exposed from the insulating filler 6.

[0037] Furthermore, the utility model further comprises a first heat sink 7 and a second heat sink 8. The first heat sink 7 is insulated and laminated on the upper surface of the first busbar body 11, and its upper surface is exposed to the insulating filler 6; the second heat sink 8 is arranged on the lower surface of the capacitor housing 5. The first heat sink 7 and the second heat sink 8 can cooperate with an external cooling module to further improve the heat dissipation performance of the capacitor.

[0038] Secondly, a second insulating film 9 is arranged between the first heat sink 7 and the first busbar body 11 to achieve electrical insulation, and a third insulating film 10 is arranged between the second heat sink 7 and the lower surface of the capacitor core 3 to achieve electrical insulation between the first connecting terminal 13 and the second heat sink 7.

[0039] 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 a first busbar and a second busbar, a capacitor core and a first insulating film; The first busbar includes a first busbar body, and a first lead terminal and a first connecting terminal connected to a side of the first busbar body; the second busbar includes a second busbar body, and a second lead terminal connected to a side of the second busbar body; The second busbar body and the first busbar body are sequentially stacked on the upper surface of the capacitor core, and the second busbar body is electrically connected to the upper surface of the capacitor core; at least two first connection terminals connected to the first busbar body are bent along different side surfaces of the capacitor core and then wound around to the lower surface of the capacitor core, and are electrically connected to the lower surface of the capacitor core; A first insulating film is arranged between the first busbar and the second busbar to achieve electrical insulation.

2. The capacitor according to claim 1, wherein: A second connecting terminal is arranged on the side of the second busbar body at a position corresponding to at least one of the first connecting terminals; the second connecting terminal is bent from the side of the second busbar body toward the side of the capacitor core, and extends in a direction parallel to the side of the capacitor core without contacting the capacitor core, and the second connecting terminal overlaps with the corresponding first connecting terminal.

3. The capacitor according to claim 2, wherein: A first extending portion is disposed on the first insulating film at a position corresponding to the second connecting terminal, and the first extending portion is located between the second connecting terminal and the first connecting terminal.

4. The capacitor according to claim 2, wherein: A second extending portion is provided on the first insulating film at a position corresponding to the first connecting terminal, and the second extending portion is located between the first connecting terminal and a side surface of the capacitor core.

5. The capacitor according to claim 1, wherein: The first lead terminal and the second lead terminal are parallel to each other; the first insulating film is provided with a third extension portion at positions corresponding to the first lead terminal and the second lead terminal, and the third extension portion is located between the first lead terminal and the second lead terminal.

6. The capacitor according to claim 1, wherein: It also includes a capacitor shell for accommodating the capacitor core, and the capacitor shell is filled with insulating filler; the first busbar body, the second busbar body, and the capacitor core are all buried in the insulating filler, and the first lead terminal and the second lead terminal are exposed from the insulating filler.

7. The capacitor according to claim 6, wherein: It also includes a first heat sink and a second heat sink. The first heat sink is insulated and stacked on the upper surface of the first busbar body, and its upper surface is exposed to the insulating filler. The second heat sink is arranged on the lower surface of the capacitor housing.

8. The capacitor according to claim 7, wherein: A second insulating film is disposed between the first heat sink and the first busbar body, and a third insulating film is disposed between the second heat sink and the lower surface of the capacitor core.

Images