New energy automobile capacitor
By incorporating screw mounting holes and external copper busbars into the capacitors of new energy vehicles, the problem of capacitors requiring specialized design and customization is solved, enabling connectivity and versatility with various power modules and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HONGFA WUFENG CAPACITOR CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-05-15
AI Technical Summary
Capacitors for new energy vehicles require specialized design and customization, which increases manufacturing costs, and external power modules are not universally compatible.
A capacitor for new energy vehicles is designed to allow connection to different power modules by setting screw mounting holes on the output terminals and external copper busbars. Universality is achieved by replacing the external copper busbars. Furthermore, the use of closely arranged capacitor cores and large-area copper busbars reduces ESL and cost.
It enables simple connection between capacitors for new energy vehicles and various power modules, reduces production costs and improves versatility, and can adapt to the needs of different power modules by replacing the external connecting copper busbar.
Smart Images
Figure CN224248463U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of capacitors for new energy vehicles, and specifically to a capacitor for new energy vehicles. Background Technology
[0002] Capacitors for new energy vehicles are one of the core components of the vehicle's electronic control system. They mainly consist of a casing, a thin-film capacitor core, a busbar, and filler (epoxy resin). Due to varying installation requirements, new energy vehicle capacitors typically require specialized design and customization, and external power modules (SiC, IGBT, etc.) are not universally compatible, leading to increased manufacturing costs. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides a capacitor for new energy vehicles that can be connected to various power modules, increasing its versatility.
[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0005] A capacitor for new energy vehicles includes an outer shell with an opening, and a thin-film capacitor core installed inside the outer shell. The thin-film capacitor core includes a positive copper busbar, a negative copper busbar, and a plurality of capacitor cores disposed between the positive copper busbar and the negative copper busbar. The positive copper busbar is connected to a positive AC output terminal, and the negative copper busbar is connected to a negative AC output terminal. The positive AC output terminal has a first external portion, and the negative AC output terminal has a second external portion. Both the first external portion and the second external portion extend outside the outer shell and are stacked in a square flat plate shape. The first external portion and the second external portion are separated by insulating paper.
[0006] The first external part is equipped with a first external copper busbar, and the second external part is equipped with a second external copper busbar. Both the first and second external copper busbars include a main body in the shape of a square plate and multiple spring contacts connected to the edge of the main body. Each spring contact is used to connect an external power module.
[0007] The main body of the first external lap copper busbar is stacked on the side of the first external part facing away from the second external part, and the main body of the second external lap copper busbar is stacked on the side of the second external part facing away from the first external part. The first external part, the second external part, the main body of the first external lap copper busbar and the main body of the second external lap copper busbar are provided with aligned screw mounting holes. The first external lap copper busbar and the second external lap copper busbar are detachably connected to the first external part and the second external part by screws passing through the screw mounting holes.
[0008] Preferably, the first external portion of the positive AC output terminal and the second external portion of the negative AC output terminal both extend out of the housing from the opening, and the positive DC input terminal and the negative DC input terminal both extend out of the housing from the side wall of the housing opposite to the opening, with the opening of the housing facing the side of the capacitor core.
[0009] Preferably, the thin-film capacitor core includes multiple rows of capacitor cores laid flat, all of which are vertically arranged and closely packed, with the positive terminal of the capacitor core facing upwards and the negative terminal facing downwards. The positive terminals of all capacitor cores are connected to a positive copper busbar, and the negative terminals of all capacitor cores are connected to a negative copper busbar.
[0010] Preferably, a Y capacitor and a grounding electrode are installed between the positive and negative copper busbars. The Y capacitor is connected to the negative copper busbar, and the grounding electrode is connected to the Y capacitor. All capacitor cores are arranged in a square shape in conjunction with the Y capacitor.
[0011] Preferably, the thin-film capacitor core has three rows of closely packed capacitor cores, two of which have the same number of capacitor cores, and the remaining row has one less capacitor core than either of the other two rows. The Y capacitor is located at the end of the row with the fewest capacitor cores.
[0012] Preferably, the power module is a SiC power module or an IGBT power module.
[0013] Preferably, the positive AC output terminal has a first connecting part, which is integrally formed with the first external part and the two are connected to form an L-shaped positive AC output terminal. The negative AC output terminal has a second connecting part, which is integrally formed with the second external part and the two are connected to form an L-shaped negative AC output terminal. The first connecting part and the second connecting part are located in the housing and are respectively welded to the positive copper busbar and the negative copper busbar.
[0014] This utility model has the following beneficial effects:
[0015] The first and second external connectors are provided with aligned screw mounting holes, so the positive AC output terminal and the negative AC output terminal can be directly connected to the power module via screws.
[0016] The first external part and the second external part can also be connected by screws to the first external copper busbar and the second external copper busbar. The first external copper busbar and the second external copper busbar are completely exposed outside the housing. The first external copper busbar and the second external copper busbar can be easily replaced by removing the screws. The first external copper busbar and the second external copper busbar are connected to the power module through spring contacts. By changing the specifications or shape of the first external copper busbar and the second external copper busbar (for example, the number or shape of the spring contacts is different), the capacitor can be connected to different power modules. Only the first external copper busbar and the second external copper busbar need to be replaced without the need to specially design the core structure of the capacitor according to different power modules.
[0017] The new energy vehicle capacitor provided by this utility model allows for the connection of a power module via screws to the first external portion of the positive AC output terminal and the second external portion of the negative AC output terminal. Alternatively, it can be equipped with a first external connecting copper busbar and a second external connecting copper busbar, with the power module connected by spring contacts on the first and second external connecting copper busbars. Furthermore, by replacing the first and second external connecting copper busbars, it can be connected to different power modules. Therefore, this utility model simply and conveniently fulfills the requirement for connecting new energy vehicle capacitors to different power modules. Users can easily and effectively connect different power modules for use. In addition, the ability to connect different power modules provides a reliable method for the universal manufacturing of new energy vehicle capacitors. Attached Figure Description
[0018] Figure 1 This is a perspective view of a capacitor for a new energy vehicle, as shown in the embodiment.
[0019] Figure 2 yes Figure 1 A schematic diagram of the capacitor after removing the first and second external copper busbars.
[0020] Figure 3 yes Figure 2 A front view of a capacitor.
[0021] Figure 4 yes Figure 2 An exploded view of a capacitor.
[0022] Figure 5 yes Figure 2 A view of the capacitor after the casing has been removed.
[0023] Figure 6 yes Figure 5 Top view.
[0024] Figure 7 yes Figure 1 A top view of a capacitor.
[0025] Figure 8 yes Figure 1 A front view of a capacitor. Detailed Implementation
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0027] 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.
[0028] like Figures 1 to 8 As shown, this embodiment discloses a capacitor for new energy vehicles, including a housing 2 with an opening 1 on the side. A thin-film capacitor core is installed inside the housing 2. The thin-film capacitor core includes a positive copper busbar 3, a negative copper busbar 4, and multiple capacitor cores 5 laid flat between the positive copper busbar 3 and the negative copper busbar 4. All capacitor cores 5 are vertically arranged and closely packed, with the positive terminal of the capacitor core 5 facing upwards and the negative terminal facing downwards. The positive terminals of all capacitor cores 5 are connected to the positive copper busbar 3, and the negative terminals of all capacitor cores 5 are connected to the negative copper busbar 4. A Y capacitor 6 and a grounding electrode 7 are also installed between the positive copper busbar 3 and the negative copper busbar 4. The Y capacitor 6 is connected to the negative copper busbar 4, and the grounding electrode 7 is connected to the Y capacitor 6.
[0029] The positive copper busbar 3 is connected to a positive DC input terminal 91 and a positive AC output terminal 81, and the negative copper busbar is connected to a negative DC input terminal 92 and a negative AC output terminal 82. The positive AC output terminal 81 has a first connecting portion and a first external portion 811, which are integrally formed and connected to form an L-shaped positive AC output terminal. The negative AC output terminal 82 has a second connecting portion and a second external portion 821, which are integrally formed and connected to form an L-shaped negative AC output terminal. The first and second connecting portions are located within the housing and are welded to the positive and negative copper busbars respectively. Both the first external portion 811 and the second external portion 821 extend outside the housing and are stacked in a square flat plate shape. The first external portion 811 and the second external portion 821 are separated by insulating paper 11 (e.g., PET). Figure 8 ).
[0030] The first external connector 811 is equipped with a first external copper busbar 12, and the second external connector 821 is equipped with a second external copper busbar 13. The first external copper busbar 12 and the second external copper busbar 13 both include a main body in the shape of a square plate and multiple spring contacts 14 connected to the edge of the main body. Each spring contact 14 is used to connect a power module (SiC, IGBT, etc.).
[0031] The main body of the first external connecting copper busbar 12 is stacked on the side of the first external portion 811 facing away from the second external portion 821, and the main body of the second external connecting copper busbar 13 is stacked on the side of the second external portion 821 facing away from the first external portion 811. The first external portion 811, the second external portion 821, the main body of the first external connecting copper busbar 12, and the main body of the second external connecting copper busbar 13 are provided with aligned screw mounting holes 10. The first external connecting copper busbar 12 and the second external connecting copper busbar 13 are detachably connected to the first external portion 811 and the second external portion 821 by screws passing through the screw mounting holes. Each spring piece 14 is connected to the side of the main body away from the outer casing and protrudes from the edges of the first external portion 811 and the second external portion 821 to prevent the first external portion 811 and the second external portion 821 from affecting the installation position of the power module.
[0032] By removing the screws, the first external connecting copper busbar 12 and the second external connecting copper busbar 13 of different specifications can be replaced, thereby matching different power modules. Therefore, the connection between the new energy vehicle capacitor and different power modules can be achieved simply by replacing the first external connecting copper busbar 12 and the second external connecting copper busbar 13, increasing the versatility of the new energy vehicle capacitor. The first external part 811 and the second external part 821 can also be connected to the power module by screws.
[0033] The opening 1 of the outer casing 2 is opposite to the side of the capacitor core 5. The first external part 811 of the positive AC output terminal 81 and the second external part 821 of the negative AC output terminal 82 both extend out of the outer casing from the opening 1. The positive DC input terminal 91 and the negative DC input terminal 92 both extend out of the outer casing 2 from the side wall of the outer casing 2 opposite to the opening 1 (the side wall is provided with through holes for the positive DC input terminal 91 and the negative DC input terminal 92 to extend out). In this way, the positive DC input terminal 91 and the negative DC input terminal 92 do not affect the installation position of the power module.
[0034] In other embodiments, the positive DC input terminal and the negative DC input terminal may also extend from other side walls of the housing 2.
[0035] As shown in the figure, the capacitor in this embodiment has three rows of closely packed capacitor cores 5. Two rows of capacitor cores 5 have the same number of cores (8 cores each), while the remaining row has one fewer core (7 cores) than either of the other two rows. The Y capacitor 6 is located at the end of the row with the fewest cores (the empty space of one core is used to accommodate the Y capacitor 6). The three rows of capacitor cores 5 and the Y capacitor 6 are arranged in a square shape, resulting in a compact structure. This reduces the size of the film capacitor core and lowers costs. The positive copper busbar 3 and the negative copper busbar 4 are laid out in a large-area flat manner. The positive copper busbar 3 is welded to the positive AC output terminal 81, and the negative copper busbar is welded to the negative AC output terminal 82. The positive AC output terminal 81 and the negative AC output terminal 82 partially extend outside the outer casing, which not only reduces ESL but also facilitates capacitor heat dissipation, providing a reliable method for the universal manufacturing of capacitors for new energy vehicles.
[0036] During assembly, the thin-film capacitor core is inserted into the housing 2 through the opening 1. A first through hole and a second through hole are provided on the housing 2 at the position opposite to the opening. The positive DC input terminal and the negative DC input terminal extend out of the housing 2 through the first through hole and the second through hole, respectively. Then, the inside of the housing 2 is filled with epoxy resin 11 to seal the opening 1.
[0037] In other embodiments, the capacitor cores 5 are not limited to three rows, and the number of capacitor cores 5 in each row is not limited to that shown in this embodiment.
[0038] 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 capacitor for new energy vehicles, characterized in that, The device includes an open outer casing, inside which a thin-film capacitor core is installed. The thin-film capacitor core includes a positive copper busbar, a negative copper busbar, and several capacitor cores disposed between the positive and negative copper busbars. The positive copper busbar is connected to a positive AC output terminal, and the negative copper busbar is connected to a negative AC output terminal. The positive AC output terminal has a first external portion, and the negative AC output terminal has a second external portion. Both the first and second external portions extend outside the outer casing and are stacked in a square flat plate shape. The first and second external portions are separated by insulating paper. The first external part is equipped with a first external copper busbar, and the second external part is equipped with a second external copper busbar. Both the first and second external copper busbars include a main body in the shape of a square plate and multiple spring contacts connected to the edge of the main body. Each spring contact is used to connect an external power module. The main body of the first external lap copper busbar is stacked on the side of the first external part facing away from the second external part, and the main body of the second external lap copper busbar is stacked on the side of the second external part facing away from the first external part. The first external part, the second external part, the main body of the first external lap copper busbar and the main body of the second external lap copper busbar are provided with aligned screw mounting holes. The first external lap copper busbar and the second external lap copper busbar are detachably connected to the first external part and the second external part by screws passing through the screw mounting holes.
2. The new energy vehicle capacitor according to claim 1, characterized in that, The first external portion of the positive AC output terminal and the second external portion of the negative AC output terminal both extend out of the housing from the opening. The positive DC input terminal and the negative DC input terminal both extend out of the housing from the side wall of the housing opposite to the opening. The opening of the housing is opposite to the side of the capacitor core.
3. The new energy vehicle capacitor according to claim 2, characterized in that, The thin-film capacitor core consists of multiple rows of capacitor cores laid flat. All capacitor cores are vertically arranged and closely packed, with the positive terminal of the capacitor core facing upwards and the negative terminal facing downwards. The positive terminals of all capacitor cores are connected to the positive copper busbar, and the negative terminals of all capacitor cores are connected to the negative copper busbar.
4. The new energy vehicle capacitor according to claim 3, characterized in that, A Y capacitor and a grounding electrode are installed between the positive and negative copper busbars. The Y capacitor is connected to the negative copper busbar, and the grounding electrode is connected to the Y capacitor. All the capacitor cores are arranged in a square shape in conjunction with the Y capacitor.
5. The new energy vehicle capacitor according to claim 4, characterized in that, The film capacitor core has three closely packed capacitor cores, two of which have the same number of capacitor cores, and the remaining row has one less capacitor core than either of the other two rows. The Y capacitor is located at the end of the row with the fewest capacitor cores.
6. The new energy vehicle capacitor according to claim 1, characterized in that, The power module is a SiC power module or an IGBT power module.
7. The new energy vehicle capacitor according to claim 1, characterized in that, The positive AC output terminal has a first connecting part, which is integrally formed with the first external part and the two are connected to form an L-shaped positive AC output terminal. The negative AC output terminal has a second connecting part, which is integrally formed with the second external part and the two are connected to form an L-shaped negative AC output terminal. The first connecting part and the second connecting part are located in the housing and are respectively welded to the positive copper busbar and the negative copper busbar.