Thin film capacitor, electric control system and vehicle

Abstract

The invention relates to a thin film capacitor, an electric control system and a vehicle. The thin film capacitor comprises at least one first capacitor, a busbar structure and at least one capacitor terminal, and the busbar structure is provided with at least one leading-out terminal; each capacitor terminal is electrically connected between one end of the corresponding first capacitor and the corresponding leading-out terminal, and the capacitor terminals are directly connected to the leading-out terminals; by shortening the path length of the electrical connection between the capacitor terminal and the leading-out terminal, the impedance of the filtering loop of the thin film capacitor is reduced, so that the filtering effect of the filtering loop is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a film capacitor, an electric control system, and a vehicle. Background Art

[0002] With the continuous improvement of environmental protection requirements, new energy electric vehicles have come into being, and the film capacitor in the electronic control system is an important component of new energy electric vehicles; the safety capacitor in the film capacitor of the related technology is welded to the busbar structure, and then the electrical connection between the safety capacitor and the lead-out terminal is realized through the busbar structure. Since the welding position of the safety capacitor and the busbar structure is far away from the lead-out terminal and the terminal of the IGBT (Insulated Gate Bipolar Transistor) module, the impedance of the filter circuit is large, which affects the filtering effect of the filter circuit.

[0003] Combined with the characteristics of related technologies, it is deduced that the prior art has a technical problem that the filter loop impedance of the film capacitor is large. Summary of the invention

[0004] The embodiments of the present application provide a thin film capacitor, an electric control system, and a vehicle, which reduce the impedance of the filter circuit to at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above object, according to a first aspect of the present application, a thin film capacitor is provided, comprising: at least one first capacitor; A busbar structure having at least one lead terminal; and At least one capacitor terminal, each of the capacitor terminals being electrically connected between one end of a corresponding first capacitor and a corresponding lead-out terminal; Wherein, the capacitor terminal is directly connected to the lead-out terminal.

[0006] Optionally, the capacitor terminal and the lead terminal at least partially overlap.

[0007] Optionally, the capacitor terminal is crimped to the lead terminal.

[0008] Optionally, the capacitor terminal includes a terminal body, a first connection portion bently connected to one side of the terminal body, and a second connection portion bently connected to the other side of the terminal body, and the second connection portion extends in a direction away from the first connection portion; wherein the first connection portion is crimped to the lead-out terminal, and the second connection portion is electrically connected to the one end of the first capacitor.

[0009] Optionally, the capacitor terminal is provided with a riveting groove, and the lead terminal is provided with a riveting protrusion, and the riveting protrusion is crimped into the riveting groove.

[0010] Optionally, the capacitor terminal also has a first screw hole, the lead-out terminal is provided with a second screw hole, and the first screw hole is connected to the second screw hole; wherein the first screw hole and the second screw hole are used for allowing a fixing member to pass through so that the capacitor terminal and the lead-out terminal are electrically connected to the controller module.

[0011] Optionally, it also includes a shell, the shell is provided with a cavity, the busbar structure is installed in the cavity, and includes a first busbar and a second busbar arranged in a stacked manner; the lead-out terminals include at least one first lead-out terminal and at least one second lead-out terminal; wherein at least one of the first lead-out terminals is electrically connected to the first busbar, and at least one of the second lead-out terminals is electrically connected to the second busbar.

[0012] Optionally, at least one of the first lead-out terminals and at least one of the second lead-out terminals are located on the same side of the busbar structure.

[0013] Optionally, the first busbar includes a first main body and a first extension portion, one side of the first extension portion is bent and connected to the first main body; wherein at least one first lead-out terminal is bent and connected to the other side of the first extension portion and extends in a direction away from the first main body.

[0014] Optionally, the second busbar includes a second main body and a second extension portion, one side of the second extension portion is bently connected to the second main body; wherein at least one second lead-out terminal is bently connected to the other side of the second extension portion and extends in a direction away from the second main body.

[0015] Optionally, it also includes at least one second capacitor installed in the cavity of the shell; the first main body includes a first main side plate, the one side of the first extension portion is bent and connected to the first main side plate, and the first main side plate is provided with at least one first welding structure; the second main body includes a second main side plate, the second main side plate is arranged opposite to the first main side plate, and is provided with at least one second welding structure; wherein each of the second capacitors is electrically connected between the corresponding first welding structure and the corresponding second welding structure.

[0016] Optionally, along the width direction of the thin film capacitor, the first bus bar and the second bus bar are overlapped, and the ratio of the area of ​​the overlapping region between the first bus bar and the second bus bar to the area of ​​the non-overlapping region between the first bus bar and the second bus bar is greater than 9:1.

[0017] Optionally, an insulating member is further included, wherein the insulating member includes a first insulating portion, and the first insulating portion is arranged between the first busbar and the second busbar.

[0018] Optionally, the shell includes a side plate surrounding the side of the cavity, and a heat sink is provided on the inner side of the side plate; the insulating member also includes a second insulating portion; wherein the second busbar is thermally connected to the heat sink, and the second insulating portion is arranged between the second busbar and the heat sink.

[0019] Optionally, the insulating member further includes a third insulating portion, and the third insulating portion is disposed at least between at least one of the first lead-out terminals and at least one of the second lead-out terminals, and the first capacitor.

[0020] Optionally, the third insulating portion is provided with at least two through holes, and the first lead terminal and the second lead terminal pass through the corresponding through holes.

[0021] Optionally, the first insulating portion, the second insulating portion and the third insulating portion are integrally formed.

[0022] Optionally, the first insulating portion goes around a side of the second busbar to be connected to the second insulating portion.

[0023] Optionally, it also includes a common grounding electrode for grounding, the common grounding electrode includes an electrode body and at least one grounding terminal electrically connected to the end of the electrode body, at least one of the grounding terminals is used for grounding; wherein the other end of the first capacitor is electrically connected to the electrode body.

[0024] Optionally, the at least one grounding terminal includes two grounding terminals, and the two grounding terminals are respectively connected to the two opposite ends of the electrode body.

[0025] According to a second aspect of the present application, there is provided an electric control system, comprising a fixing bracket, a controller module and a film capacitor as described in any one of the above embodiments.

[0026] According to a third aspect of the present application, a vehicle is also provided, comprising a film capacitor as described in any of the above embodiments, or comprising an electronic control system as described in the above embodiments.

[0027] In the thin film capacitor of the embodiment of the present application, the capacitor terminal is directly connected to the lead-out terminal of the busbar structure, and the impedance of the filter circuit of the thin film capacitor is reduced by shortening the path length of the electrical connection between the capacitor terminal and the lead-out terminal, thereby improving the filtering effect of the filter circuit, further improving the electromagnetic compatibility of the electronic control system including the above-mentioned thin film capacitor, and alleviating the technical problem of large impedance of the filter circuit of the thin film capacitor in the prior art.

[0028] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0030] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0031] Figure 1 is a schematic diagram of the overall structure of a thin film capacitor provided in an exemplary embodiment of the present disclosure; Figure 2 is a schematic structural diagram of a busbar capacitor and a filter capacitor integrated system in a film capacitor provided in an exemplary embodiment of the present disclosure; Figure 3 is a schematic diagram of connecting electrical components in a film capacitor provided in an exemplary embodiment of the present disclosure; Figure 4 is a schematic structural diagram of a laminated busbar assembly in a film capacitor provided in an exemplary embodiment of the present disclosure; Figure 5 is a schematic structural diagram of a capacitor filter component in a thin film capacitor provided in an exemplary embodiment of the present disclosure; Figure 6 is a schematic structural diagram of a common ground electrode in a thin film capacitor provided in an exemplary embodiment of the present disclosure; Figure 7 Schematic diagram of the structure of a shell in a film capacitor provided in an exemplary embodiment of the present disclosure.

[0032] Description of reference numerals: 1. Lead terminal; 11. First lead terminal; 12. Second lead terminal; 111. Second screw hole; 112. Riveting protrusion; 2. capacitor terminal; 21. terminal body; 22. first connection part; 23. second connection part; 221. first screw hole; 222. riveting groove; 10. battery cell group; 90. second capacitor; 20, housing; 201, heat sink; 202, first grounding terminal; 203, second grounding terminal; 30. Thermal conductive adhesive; 40. first busbar; 401. first main body; 402. first extension portion; 403. first main side plate; 404. first welding structure; 50, second busbar; 501, second main body; 502, second extension portion; 503, second main side plate; 504, second welding structure; 60, insulating member; 601, first insulating portion; 602, second insulating portion; 603, third insulating portion; 604, perforation; 70, common ground electrode; 701, electrode body; 702, third ground terminal; 703, fourth ground terminal; 80, first capacitor; 801, first pin; 802, second pin. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0034] According to the first aspect of this application, see Figures 1 to 7 The film capacitor provided by the present disclosure includes at least one first capacitor 80, a busbar structure, and at least one capacitor terminal 2. The busbar structure is provided with at least one lead-out terminal 1; each capacitor terminal 2 is electrically connected between one end of the corresponding first capacitor 80 and the corresponding lead-out terminal 1, and the capacitor terminal 2 is directly connected to the lead-out terminal 1.

[0035] The first capacitor 80 may be a safety capacitor.

[0036] The direct connection includes crimping, riveting, welding and other direct connection methods.

[0037] In the present embodiment, the filter circuit of the thin film capacitor includes an electrical connection path between the capacitor terminal 2 and the lead terminal 1. Compared with the related art in which the capacitor terminal 2 is welded to the busbar structure and indirectly electrically connected to the lead terminal 1 using the busbar structure, the present embodiment directly connects the capacitor terminal 2 to the lead terminal 1, thereby reducing the impedance of the filter circuit of the thin film capacitor and improving the filtering effect of the filter circuit.

[0038] In one embodiment, the capacitor terminal 2 and the lead terminal 1 at least partially overlap.

[0039] In this embodiment, the capacitor terminal 2 and the lead terminal 1 at least partially overlap, so that the capacitor terminal 2 and the lead terminal 1 can be directly connected in the overlapping area.

[0040] In one embodiment, see Figure 1The busbar capacitor and the filter capacitor integrated system are packaged in the cavity of the housing 20 by heat-baking the heat-conducting adhesive 30 to form the required film capacitor.

[0041] Among them, see Figure 2 The film capacitor includes a busbar capacitor and a filter capacitor integrated system. The laminated busbar assembly and the capacitor filter assembly are crimped with the riveting groove 222 on the capacitor terminal 2 and the riveting protrusion 112 on the lead terminal 1 to form the busbar capacitor and filter capacitor integrated system.

[0042] See also Figure 3 The film capacitor includes electrical components, which include at least a first busbar 40, a second busbar 50, an insulating member 60, a common ground electrode 70, a cell group 10, a capacitor terminal 2, and a first capacitor 80.

[0043] See also Figure 4 The film capacitor includes a laminated busbar assembly, which includes a first busbar 40, a second busbar 50, and an insulating member 60 that are laminated. The laminated busbar assembly is used to realize the electrical connection function of the film capacitor and the function of a heat dissipation path for the battery cell group 10.

[0044] See also Figure 5 The film capacitor includes a capacitor filter component, which includes a common ground electrode 70, a first capacitor 80, and a capacitor terminal 2. The capacitor filter component is used to achieve a filtering function and suppress system common mode interference, thereby achieving the effect of improving the electromagnetic compatibility of the electronic control system.

[0045] In one embodiment, see Figure 3 The film capacitor further includes a battery cell group 10, and the battery cell group 10 includes a plurality of battery cells electrically connected to each other.

[0046] Among them, the battery cell group 10 includes one or more second capacitors 90, the second capacitor 90 includes two polarity ends, one polarity end is welded to the first busbar 40 of the busbar structure through a first welding point, and the other polarity end is welded to the second busbar 50 of the busbar structure through a second welding point. The battery cell group 10 serves as the main body of the film capacitor to form the basic function of the film capacitor.

[0047] In some embodiments, see Figure 1 , the capacitor terminal 2 is crimped to the lead terminal 1.

[0048] Understandably, see Figure 4 , Figure 5 Two riveting protrusions 112 are provided on the lead terminal 1, and two riveting grooves 222 are provided on the capacitor terminal 2. The two riveting protrusions 112 and the two riveting grooves 222 are crimped to each other, so that the capacitor terminal 2 is crimped to the lead terminal 1.

[0049] In some embodiments, see Figure 5 , Figure 6 The capacitor terminal 2 includes a terminal body 21, a first connection portion 22 bently connected to one side of the terminal body 21, and a second connection portion 23 bently connected to the other side of the terminal body 21, and the second connection portion 23 extends in a direction away from the first connection portion 22; wherein the first connection portion 22 is crimped to the lead-out terminal 1, and the second connection portion 23 is electrically connected to one end of the first capacitor 80.

[0050] Among them, a first pin 801 is formed at one end of the first capacitor 80, and a second pin 802 is formed at the other end thereof. The first capacitor 80 is electrically connected to the second connecting portion 23 of the capacitor terminal 2 through the first pin 801, and the first capacitor 80 is electrically connected to the electrode body 701 of the common ground electrode 70 through the second pin 802.

[0051] In some embodiments, the first connection portion 22 is provided with a rivet groove 222 , and the lead terminal 1 is provided with a rivet protrusion 112 , and the rivet protrusion 112 is crimped into the rivet groove 222 .

[0052] In some embodiments, see Figure 4 , Figure 5 The first connecting part 22 also has a first screw hole 221, and the lead terminal 1 is provided with a second screw hole 111, and the first screw hole 221 is connected to the second screw hole 111; wherein the first screw hole 221 and the second screw hole 111 are used for allowing a fixing member to pass through so that the first connecting part 22 and the lead terminal 1 are electrically connected to the controller module.

[0053] The controller module may be an IGBT module.

[0054] The fixing member may be a screw.

[0055] It can be understood that each lead-out terminal 1 is designed with a second screw hole 111 and two rivet protrusions 112, each capacitor terminal 2 is designed with a first screw hole 221 and two rivet grooves 222, and the terminal of the IGBT module is also designed with another screw hole. The second screw hole 111 of the lead-out terminal 1, the first screw hole 221 of the capacitor terminal 2, and the other screw hole of the terminal of the IGBT module are interconnected, and the lead-out terminal 1 and the capacitor terminal 2 are riveted to the terminal of the IGBT module by passing the screw through the three interconnected screw holes.

[0056] In some embodiments, see Figure 2 , Figure 7, also includes a shell 20, the shell 20 is provided with a cavity, the busbar structure is installed in the cavity, and includes a first busbar 40 and a second busbar 50 arranged in a stacked manner; at least one lead-out terminal 1 includes at least one first lead-out terminal 11 and at least one second lead-out terminal 12; wherein, at least one first lead-out terminal 11 is electrically connected to the first busbar 40, and at least one second lead-out terminal 12 is electrically connected to the second busbar 50.

[0057] Among them, the first busbar 40 can be a positive busbar / negative busbar, and the second busbar 50 can be a negative busbar / positive busbar.

[0058] The number of the first lead-out terminals 11 is equal to the number of the second lead-out terminals 12 .

[0059] The shell 20 may include a bottom surface and a plurality of side surfaces arranged around the bottom surface, the plurality may be three or four or more, the bottom surface and the plurality of side surfaces surround the cavity, the top of the cavity is open to form a cavity opening, and a first grounding terminal 202 and a second grounding terminal 203 are respectively arranged on two opposite sides near the cavity opening, and the first grounding terminal 202 and the second grounding terminal 203 are respectively grounded.

[0060] A portion of the second busbar 50 is bent and wound between the heat sink 201 and the first busbar 40 .

[0061] It can be understood that the cavity is used to realize the component packaging of the film capacitor, the packaged shell 20 and the components are insulated from each other, and the busbar structure plays a role of DC support and filtering in the film capacitor.

[0062] In some embodiments, see Figure 1 , at least one first lead-out terminal 11 and at least one second lead-out terminal 12 are located on the same side of the busbar structure.

[0063] It can be understood that by arranging at least one first lead-out terminal 11 and at least one second lead-out terminal 12 on the same side of the busbar structure, it is convenient to directly connect the lead-out terminal 1 with the capacitor terminal 2 .

[0064] In some embodiments, see Figure 4 The first busbar 40 includes a first main body 401 and a first extension portion 402, one side of the first extension portion 402 is bent and connected to the first main body 401; wherein at least one first lead-out terminal 11 is bent and connected to the other side of the first extension portion 402 and extends in a direction away from the first main body 401.

[0065] In some embodiments, see Figure 4The second busbar 50 includes a second main body 501 and a second extension portion 502, one side of the second extension portion 502 is bent and connected to the second main body 501; wherein at least one second lead-out terminal 12 is bent and connected to the other side of the second extension portion 502 and extends in a direction away from the second main body 501.

[0066] In some embodiments, see Figure 3 , and also includes at least one second capacitor 90 installed in the cavity of the shell 20; the first main body 401 includes a first main side plate 403, one side of the first extension portion 402 is bent and connected to the first main side plate 403, and the first main side plate 403 is provided with at least one first welding structure 404; the second main body 501 includes a second main side plate 503, the second main side plate 503 is arranged opposite to the first main side plate 403, and is provided with at least one second welding structure 504; wherein each second capacitor 90 is electrically connected between the corresponding first welding structure 404 and the corresponding second welding structure 504.

[0067] The battery cell group 10 includes at least one second capacitor 90 , and the battery cell group 10 is welded between the first busbar 40 and the second busbar 50 through the first welding structure 404 and the second welding structure 504 .

[0068] In some embodiments, see Figure 4 Along the width direction of the film capacitor, the first busbar 40 and the second busbar 50 are overlapped, and the ratio of the area of ​​the overlapping region between the first busbar 40 and the second busbar 50 to the area of ​​the non-overlapping region between the first busbar 40 and the second busbar 50 is greater than 9:1.

[0069] The width direction of the film capacitor is perpendicular to the heat dissipation surface of the heat dissipation plate 201 .

[0070] In this embodiment, by making the overlap ratio of the first busbar 40 and the second busbar 50 in the width direction of the film capacitor greater than 90%, the parasitic inductance of the busbar structure can be further reduced.

[0071] In some embodiments, see Figure 4 , further comprising an insulating member 60 , the insulating member 60 comprising a first insulating portion 601 , and the first insulating portion 601 is disposed between the first busbar 40 and the second busbar 50 .

[0072] The insulating member 60 may be made of polyethylene terephthalate.

[0073] The first insulating portion 601 of the insulating member 60 is used to achieve the insulation setting of the first busbar 40 and the second busbar 50 .

[0074] Among them, the first insulating part 601, the first busbar 40, and the second busbar 50 are pressed together through a hot pressing process. After hot pressing, the first busbar 40 and the second busbar 50 are fully thermally connected through the first insulating part 601, so that heat can be conducted to the heat sink 201 of the shell 20 through the insulating part 60 in a shorter path, so as to reduce the temperature rise of the film capacitor.

[0075] It can be understood that the function of the insulating member 60 is to achieve the insulation function between the first busbar 40 and the second busbar 50, the first lead terminal 11 and the second lead terminal 12 of the film capacitor, and at the same time to achieve the insulation function between the busbar structure of the film capacitor and the heat dissipation plate 201 of the shell 20, and also to achieve the insulation function between the battery cell group 10 and the first capacitor 80.

[0076] In some embodiments, see Figure 4 , Figure 7 The shell 20 includes a side plate surrounding the side of the cavity, and a heat sink 201 is provided on the inner side of the side plate; the insulating member 60 also includes a second insulating portion 602; wherein the second busbar 50 is thermally connected to the heat sink 201, and the second insulating portion 602 is arranged between the second busbar 50 and the heat sink 201.

[0077] The second insulating portion 602 of the insulating member 60 is used to achieve the insulation setting between the second busbar 50 and the heat sink 201 .

[0078] Among them, a heat sink 201 is embedded on the inner side of the side plate of the shell 20, the heat dissipation surface of the heat sink 201 is close to the busbar structure, and the other opposite surface of the heat sink 201 is close to the cooling mechanism. The cooling mechanism may include a heat dissipation water channel, which can be attached to the outer surface of the shell 20 and arranged opposite to the heat sink 201. The heat sink 201 and the heat dissipation water channel can be used to quickly extract and dissipate the heat of the components in the film capacitor.

[0079] The heat sink 201 may be a heat sink aluminum plate.

[0080] In some embodiments, see Figure 4 The insulating member 60 further includes a third insulating portion 603 , and the third insulating portion 603 is at least disposed between at least one first lead-out terminal 11 and at least one second lead-out terminal 12 , and the first capacitor 80 .

[0081] The third insulating portion 603 of the insulating member 60 is used to achieve the insulation between the lead-out terminal 1 and the first capacitor 80 .

[0082] It is understandable that when the battery cell group 10 is working, the internal dielectric loss will generate capacitor loss heat, resulting in the heat of the film capacitor being mainly concentrated on the battery cell group 10. In this embodiment, the busbar structure has a good heat dissipation effect. The busbar structure can export the heat of the battery cell group 10 and transfer it to the heat sink 201 of the shell 20, and then take the heat away through the cooling mechanism in the electronic control system to avoid circuit failure caused by overheating of the core group.

[0083] In some embodiments, see Figure 4 The third insulating portion 603 is provided with at least two through holes 604 , and the first lead terminal 11 and the second lead terminal 12 pass through the corresponding through holes 604 .

[0084] Among them, the third insulating part 603 is provided with a through hole 604 along the thickness direction of the thin film capacitor, and the through hole 604 penetrates the third insulating part 603. The lead terminal 1 is arranged along the penetration direction of the through hole 604, and the part directly connected to the lead terminal 1 and the capacitor terminal 2 protrudes from the third insulating part 603. The third insulating part 603 also realizes the insulation setting between the first lead terminal 11 and the second lead terminal 12 to prevent the first lead terminal 11 and the second lead terminal 12 from short-circuiting.

[0085] In some embodiments, see Figure 4 , the first insulating part 601, the second insulating part 602 and the third insulating part 603 are integrally formed.

[0086] The first insulating part 601 , the second insulating part 602 and the third insulating part 603 are made of the same material.

[0087] In this embodiment, the insulating member 60 is integrally formed to reduce the cost.

[0088] In some embodiments, the first insulating portion 601 goes around a side of the second busbar 50 to be connected to the second insulating portion 602 .

[0089] In some embodiments, the film capacitor further includes a thermally conductive adhesive 30 , which is in thermally conductive contact with the first busbar 40 , the second busbar 50 , and the heat sink 201 , respectively, to enhance the heat conduction effect between the busbar structure and the heat sink 201 .

[0090] The thermal conductive adhesive 30 is used to achieve the heat transfer and heat dissipation function in the film capacitor.

[0091] The thermal conductive adhesive 30 may be made of epoxy resin.

[0092] It can be understood that the thermal conductive adhesive 30 is also used to fill the electrical gaps between the components of the film capacitor, which components include at least a busbar structure, a capacitor terminal 2, a first capacitor 80, and a battery cell group 10; the thermal conductive adhesive 30 is tightly combined with the inner wall of the shell 20 facing the cavity, so that the positions of the components in the film capacitor are relatively fixed, thereby improving the environmental test adaptability of the film capacitor.

[0093] In this embodiment, by filling the thin film capacitor with thermal conductive adhesive 30, the thermal conductive adhesive 30 can not only enhance the heat exchange effect between the components, but also fill the electrical gaps between the components, so that the positions of the components in the thin film capacitor are relatively fixed, thereby improving the environmental test adaptability of the thin film capacitor.

[0094] In some embodiments, see Figure 6 , further comprising a common grounding electrode 70 for grounding, the common grounding electrode 70 comprising an electrode body 701 and at least one grounding terminal electrically connected to the end of the electrode body 701, the at least one grounding terminal being used for grounding; wherein the other end of the first capacitor 80 is electrically connected to the electrode body 701. wherein the electrode body 701 is formed with a plurality of welding structures on one side facing the first capacitor 80, the welding structures being electrically connected to the second pin 802 of the first capacitor 80, so as to realize welding between the first capacitor 80 and the common grounding electrode 70.

[0095] The common ground electrode 70 is used to realize the ground connection function between the battery cell group 10 and the first capacitor 80 .

[0096] The common ground electrode 70 may be made of copper.

[0097] In some embodiments, see Figure 6 , Figure 7 , at least one grounding terminal includes two grounding terminals, and the two grounding terminals are respectively connected to the opposite ends of the electrode body 701.

[0098] Among them, the first grounding terminal 202 and the second grounding terminal 203 are arranged on two opposite sides of the shell 20, and the common grounding electrode 70 is provided with a third grounding terminal 702 and a fourth grounding terminal 703 which are opposite to each other at the position where the first grounding terminal 202 and the second grounding terminal 203 are arranged on the corresponding shell 20. The third grounding terminal 702 is electrically connected to the first grounding terminal 202, and the fourth grounding terminal 703 is electrically connected to the second grounding terminal 203. The first capacitor 80 can be selectively electrically connected to the first grounding terminal 202 and the third grounding terminal 702, or, electrically connected to the second grounding terminal 203 and the fourth grounding terminal 703.

[0099] Furthermore, the third grounding terminal 702 of the common grounding electrode 70 is riveted to the first grounding terminal 202 of the housing 20, and the fourth grounding terminal 703 of the common grounding electrode 70 is riveted to the second grounding terminal 203 of the housing 20, so as to realize the grounding connection between the common grounding electrode 70 and the housing 20, and the first capacitor 80 is connected to the box of the electric control system of the vehicle through the common grounding electrode 70 and the housing 20. The common grounding electrode 70 is arranged on the third grounding terminal 702 and the fourth grounding terminal 703 on the opposite side, which is conducive to reducing the impedance of the filter circuit and improving the suppression of system common mode interference.

[0100] In this embodiment, by providing the third ground terminal 702 and the fourth ground terminal 703 at two opposite ends of the common ground electrode 70 , it is helpful to reduce the impedance of the filter loop and enhance the suppression of system common mode interference.

[0101] In one embodiment, see Figure 5 , Figure 7 The first ground terminal 202 is electrically connected to at least one capacitor terminal 2 close to the first ground terminal 202 , and the second ground terminal 203 is electrically connected to at least one capacitor terminal 2 close to the second ground terminal 203 .

[0102] It can be understood that by electrically connecting the first ground terminal 202 with at least one adjacent capacitor terminal 2 to form a loop, and electrically connecting the second ground terminal 203 with the remaining capacitor terminals 2 to form a loop, compared to the design in which the shell 20 and the common ground electrode only form one ground terminal, this embodiment can further reduce the impedance of the filter loop in the thin film capacitor.

[0103] It should be noted that the path of the filter circuit is from the terminal of the IGBT module of the electric control system, through the lead-out terminal 1 of the busbar structure, the capacitor terminal 2, the third grounding terminal 702 / the fourth grounding terminal 703 of the common grounding electrode 70, and the first grounding terminal 202 / the second grounding terminal 203 of the shell 20 in sequence; in the above embodiment, by directly connecting the lead-out terminal 1 with the capacitor terminal 2, the path length between the lead-out terminal 1 and the capacitor terminal 2 in the filter circuit is shortened, thereby reducing the impedance of the filter circuit; in the above embodiment, by setting two grounding terminals on each of the shell 20 and the common grounding electrode 70, the path length between the capacitor terminal 2 and the grounding terminal of the common grounding electrode 70 in the filter circuit is shortened, which can further reduce the impedance of the filter circuit.

[0104] In this embodiment, the first capacitor 80 is selectively connected to a nearby ground terminal, which can shorten the path of the filter loop between the first capacitor 80 and the ground terminal and reduce the impedance of the filter loop.

[0105] In one embodiment, see Figure 5 , Figure 7 The film capacitor includes 6 first capacitors 80, 6 capacitor terminals 2, three capacitor terminals 2 close to the first grounding terminal 202 and the third grounding terminal 702, and electrically connected to the first grounding terminal 202 and the third grounding terminal 702, and three capacitor terminals 2 close to the second grounding terminal 203 and the fourth grounding terminal 703 are electrically connected to the second grounding terminal 203 and the fourth grounding terminal 703.

[0106] It can be understood that, although the present embodiment is illustrated by taking six first capacitors 80 and six capacitor terminals 2 as an example, the number of first capacitors 80 and capacitor terminals 2 should not be limited to six. The thin film capacitor includes one or more pairs of first capacitors 80, and it is only necessary that the number of first capacitors 80 and capacitor terminals 2 is equal.

[0107] In this embodiment, the first capacitor 80 is divided into two groups, each group includes half of the first capacitor 80, and the distance between any first capacitor 80 in the first group and the third ground terminal 702 is smaller than the distance between the first capacitor 80 and the fourth ground terminal 703, and the first capacitor 80 in the first group is electrically connected to the third ground terminal 702 and the first ground terminal 202, so that the path length of the filter loop is shorter; the distance between any first capacitor 80 in the second group and the fourth ground terminal 703 is smaller than the distance between the first capacitor 80 and the third ground terminal 702, and the first capacitor 80 in the second group is electrically connected to the fourth ground terminal 703 and the second ground terminal 203, so that the path length of the filter loop is shorter, thereby better reducing the impedance of the filter loop of the first capacitor 80 and improving the filtering effect of the filter loop.

[0108] According to a second aspect of the present disclosure, an electric control system is provided, which includes a fixing bracket, an IGBT module and a thin film capacitor as in any of the above embodiments; the electric control system has all the beneficial effects of the above thin film capacitors, which will not be described in detail in the present disclosure.

[0109] According to a third aspect of the present disclosure, a vehicle is provided, which includes an electric control system or a thin film capacitor of any of the above-mentioned embodiments. The vehicle has all the beneficial effects of the electric control system or the thin film capacitor of any of the embodiments, which will not be described in detail in the present disclosure.

[0110] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and the present disclosure does not make any specific limitation on this.

[0111] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0112] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0113] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0114] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A film capacitor, characterized in that: include: At least one first capacitor (80); A busbar structure, provided with at least one lead terminal (1); as well as At least one capacitor terminal (2), each of the capacitor terminals (2) being electrically connected between one end of a corresponding first capacitor (80) and a corresponding lead terminal (1); Wherein, the capacitor terminal (2) is directly connected to the lead-out terminal (1).

2. The film capacitor according to claim 1, characterized in that: The capacitor terminal (2) and the lead terminal (1) at least partially overlap.

3. The film capacitor according to claim 2, characterized in that: The capacitor terminal (2) is crimped onto the lead terminal (1).

4. The film capacitor according to claim 3, characterized in that: The capacitor terminal (2) comprises a terminal body (21), a first connection portion (22) connected in a bent manner to one side of the terminal body (21), and a second connection portion (23) connected in a bent manner to the other side of the terminal body (21), wherein the second connection portion (23) extends in a direction away from the first connection portion (22); wherein the first connection portion (22) is crimped to the lead terminal (1), and the second connection portion (23) is electrically connected to the one end of the first capacitor (80).

5. The film capacitor according to claim 3, characterized in that: The capacitor terminal (2) is provided with a riveting groove (222), and the lead terminal (1) is provided with a riveting protrusion (112), and the riveting protrusion (112) is crimped into the riveting groove (222).

6. The film capacitor according to claim 5, characterized in that: The capacitor terminal (2) also has a first screw hole (221), the lead terminal (1) is provided with a second screw hole (111), and the first screw hole (221) is connected to the second screw hole (111); wherein the first screw hole (221) and the second screw hole (111) are used for allowing a fixing member to pass through so that the capacitor terminal (2) and the lead terminal (1) are electrically connected to the controller module.

7. The film capacitor according to claim 1, characterized in that: The invention also comprises a shell (20), wherein the shell (20) is provided with a cavity, wherein the busbar structure is installed in the cavity and comprises a first busbar (40) and a second busbar (50) which are stacked; the lead terminal (1) comprises at least one first lead terminal (11) and at least one second lead terminal (12); wherein at least one first lead terminal (11) is electrically connected to the first busbar (40), and at least one second lead terminal (12) is electrically connected to the second busbar (50).

8. The film capacitor according to claim 7, characterized in that: At least one of the first lead-out terminals (11) and at least one of the second lead-out terminals (12) are located on the same side of the busbar structure.

9. The film capacitor according to claim 8, characterized in that: The first busbar (40) comprises a first main body (401) and a first extension portion (402), one side of the first extension portion (402) being connected to the first main body (401) in a bent manner; wherein at least one first lead-out terminal (11) is connected to the other side of the first extension portion (402) in a bent manner and extends in a direction away from the first main body (401).

10. The film capacitor according to claim 9, characterized in that: The second busbar (50) comprises a second main body (501) and a second extension portion (502), one side of the second extension portion (502) being connected to the second main body (501) in a bent manner; wherein at least one second lead-out terminal (12) is connected to the other side of the second extension portion (502) in a bent manner and extends in a direction away from the second main body (501).

11. The film capacitor according to claim 10, characterized in that: It also includes at least one second capacitor (90) installed in the cavity of the shell (20); the first main body (401) includes a first main side plate (403), the one side of the first extension portion (402) is bent and connected to the first main side plate (403), and the first main side plate (403) is provided with at least one first welding structure (404); the second main body (501) includes a second main side plate (503), the second main side plate (503) is arranged opposite to the first main side plate (403), and is provided with at least one second welding structure (504); wherein each second capacitor (90) is electrically connected between the corresponding first welding structure (404) and the corresponding second welding structure (504).

12. The film capacitor according to claim 7, characterized in that: Along the width direction of the film capacitor, the first busbar (40) and the second busbar (50) are arranged to overlap, and the ratio of the area of ​​the overlapping region between the first busbar (40) and the second busbar (50) to the area of ​​the non-overlapping region between the first busbar (40) and the second busbar (50) is greater than 9:

1.

13. The film capacitor according to claim 7, characterized in that: It also includes an insulating member (60), wherein the insulating member (60) includes a first insulating portion (601), and the first insulating portion (601) is arranged between the first busbar (40) and the second busbar (50).

14. The film capacitor according to claim 13, characterized in that: The shell (20) comprises a side plate surrounding the side of the cavity, and a heat sink (201) is provided on the inner side of the side plate; the insulating member (60) further comprises a second insulating portion (602); wherein the second busbar (50) is thermally connected to the heat sink (201), and the second insulating portion (602) is provided between the second busbar (50) and the heat sink (201).

15. The film capacitor according to claim 14, characterized in that: The insulating member (60) further comprises a third insulating portion (603), wherein the third insulating portion (603) is at least arranged between at least one of the first lead-out terminals (11) and at least one of the second lead-out terminals (12), and the first capacitor (80).

16. The film capacitor according to claim 15, characterized in that: The third insulating portion (603) is provided with at least two through holes (604), and the first lead terminal (11) and the second lead terminal (12) pass through the corresponding through holes (604).

17. The film capacitor according to claim 15, characterized in that: The first insulating portion (601), the second insulating portion (602) and the third insulating portion (603) are integrally formed.

18. The film capacitor according to claim 15, characterized in that: The first insulating portion (601) goes around the side of the second busbar (50) to be connected to the second insulating portion (602).

19. The film capacitor according to claim 1, characterized in that: It also includes a common grounding electrode (70) for grounding, wherein the common grounding electrode (70) includes an electrode body (701) and at least one grounding terminal electrically connected to an end of the electrode body (701), and at least one of the grounding terminals is used for grounding; wherein the other end of the first capacitor (80) is electrically connected to the electrode body (701).

20. The film capacitor according to claim 19, characterized in that: The at least one grounding terminal comprises two grounding terminals, and the two grounding terminals are respectively connected to the two opposite ends of the electrode body (701).

21. An electric control system, characterized in that: It comprises a fixing bracket, a controller module and a film capacitor as claimed in any one of claims 1 to 20.

22. A vehicle, characterized in that: Comprising the film capacitor according to any one of claims 1 to 20, or comprising the electronic control system according to claim 21.

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