Capacitor assembly and tool

Abstract

The utility model relates to a capacitor assembly and a tool, the capacitor assembly comprises a shell, copper bars and a capacitor core, the shell comprises a containing cavity, the copper bars comprise a positive electrode copper bar and a negative electrode copper bar, and the capacitor core is located between the positive electrode copper bar and the negative electrode copper bar in the height direction. Wherein the positive electrode copper bar and the negative electrode copper bar are both provided with through holes, and the through holes are used for being filled with injection molding materials, so that the capacitor core, the copper bars and the shell are fixed through the injection molding materials. According to the capacitor assembly, the through holes are formed in the positive electrode copper bar and the negative electrode copper bar, so that liquid injection molding materials can flow into gaps among the positive electrode copper bar, the negative electrode copper bar, the capacitor core and the shell, generation of cavities is reduced, the reliability and stability of connection of all parts of the capacitor assembly are improved, and then the electrical performance and the mechanical performance of the capacitor assembly are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor controllers, in particular to a capacitor component and a tool. Background Art

[0002] The motor controller is a key component of new energy vehicles. It contains a capacitor assembly for connecting the power battery and the insulated-gate bipolar transistor (IGBT). The capacitor assembly serves as the main filtering component to stabilize the voltage of the IGBT in the motor controller. It can also compensate for the difference between the output power and input power of the three-phase bridge and provide support for the motor controller. The capacitor assembly generally includes a housing, as well as a capacitor core, copper busbar, and other components installed in the housing. During installation, injection molding is required to securely connect the components to the housing. However, due to the large number of components, injection molding is not convenient, which can easily lead to problems such as reduced electrical and mechanical properties of the capacitor. Utility Model Content

[0003] The present application provides a capacitor assembly and tooling for solving the problem that during the assembly process of the capacitor assembly, the various components of the capacitor assembly need to be fixed to each other with injection molding plastic. However, due to the large number of components, injection molding is not convenient, which easily leads to reduced electrical and mechanical properties of the capacitor.

[0004] The present application provides a capacitor assembly, which includes a shell, a copper busbar and a capacitor core. The shell includes a accommodating cavity. The copper busbar includes a positive copper busbar and a negative copper busbar. The capacitor core is located between the positive copper busbar and the negative copper busbar along the height direction.

[0005] Wherein, the positive copper busbar and the negative copper busbar are both provided with through holes, and the through holes are used to be filled with injection molding material, so that the capacitor core, the copper busbar and the shell are fixed by the injection molding material.

[0006] In this solution, through holes are provided on the positive copper busbar and the negative copper busbar so that the liquid injection molding material can flow into the gap between the positive and negative copper busbars, the capacitor core and the shell, so as to reduce the generation of voids, which is beneficial to improving the reliability and stability of the connection between the various components of the capacitor assembly, and further beneficial to improving the electrical and mechanical properties of the capacitor assembly.

[0007] In this solution, the positive copper busbar includes a first body and a positive terminal, the negative copper busbar includes a second body and a negative terminal, the capacitor core is located between the first body and the second body in the height direction and is connected to the two, and the positive terminal and the negative terminal both extend out of the accommodating cavity.

[0008] The through hole includes a first through hole, and the first body and the second body are both provided with the first through hole. The first body and the capacitor core are welded through the first through hole provided in the first body, and the second body and the capacitor core are welded through the first through hole provided in the second body.

[0009] In this solution, the side wall of the first through hole is provided with an extension portion, and the capacitor core and the copper busbar are welded through the extension portion.

[0010] In this solution, the capacitor core includes a plurality of core monomers distributed along the length direction, and the first body and the second body are both provided with a plurality of first through holes distributed at intervals along the length direction, and each first through hole is used for welding with each core monomer.

[0011] In this solution, the housing is provided with a blocking portion for separating the adjacent positive electrode terminals and the negative electrode terminals.

[0012] In this embodiment, the positive copper busbar further includes a third body vertically connected to the first body, and the negative copper busbar further includes a fourth body vertically connected to the second body. Along the width direction of the capacitor core, the capacitor core is located between the third body and the fourth body.

[0013] The through hole of the positive copper busbar further includes a second through hole, and the through hole of the negative copper busbar further includes a third through hole and a fourth through hole, the second through hole is arranged at the connection between the first body and the third body, the third through hole is arranged at the connection between the second body and the fourth body, and the fourth through hole is arranged in the fourth body.

[0014] In this solution, insulating paper is provided between the positive electrode copper busbar and the negative electrode copper busbar along the width direction.

[0015] In this solution, the capacitor assembly further includes a heat sink mounted on the shell. The bottom wall of the shell is provided with an opening, and the heat sink dissipates heat through the opening. Insulating paper is provided between the heat sink and the negative copper busbar.

[0016] The second aspect of the present application provides a tooling, which is used to fix the capacitor assembly during the injection molding process. The tooling includes a bracket and a pressure plate. The bracket is used to support the capacitor assembly, and the capacitor assembly is any one of the capacitor assemblies described above. The pressure plate is installed on the bracket, and the pressure plate can move toward or away from the bracket.

[0017] In this solution, the capacitor assembly includes a mounting portion, and along the height direction of the capacitor core, the mounting portion is provided with a protruding positioning column, and the bracket is provided with a positioning hole that cooperates with the positioning column.

[0018] The bracket includes a protrusion, the positive copper busbar includes a positive terminal, the negative copper busbar includes a negative terminal, and the positive terminal and the negative terminal both include connection holes, which can cooperate with the protrusion to position the positive terminal and the negative terminal.

[0019] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a capacitor assembly provided in this application in a specific embodiment;

[0021] Figure 2 for Figure 1 Exploded diagram;

[0022] Figure 3 for Figure 1 A schematic structural diagram of the capacitor assembly provided in another perspective in a specific embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of the connection between the positive and negative copper bars and the capacitor core provided by this application;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure of the connection between the positive and negative copper busbars and the capacitor core from another perspective;

[0025] Figure 6 This is a schematic diagram of the structure of the positive copper busbar provided in this application;

[0026] Figure 7 This is a schematic diagram of the structure of the negative copper busbar provided in this application;

[0027] Figure 8 This is a schematic structural diagram of the tooling and capacitor assembly provided in this application in a specific embodiment;

[0028] Figure 9 for Figure 7 sectional view of ;

[0029] Figure 10 This is a front view of a capacitor component provided in this application in a specific embodiment.

[0030] Description of reference numerals:

[0031] 1-Capacitor component;

[0032] 11- housing;

[0033] 111-accommodation chamber;

[0034] 1111-Reinforcement ribs;

[0035] 112- blocking portion;

[0036] 113-opening;

[0037] 114-installation part;

[0038] 1141- positioning column;

[0039] 12-copper busbar;

[0040] 121-positive copper busbar;

[0041] 1211-First ontology;

[0042] 1212-the third body;

[0043] 1213-positive terminal;

[0044] 1213a-first terminal;

[0045] 1213b-second terminal;

[0046] 122-negative copper busbar;

[0047] 1221-Second body;

[0048] 1222-Fourth Body;

[0049] 1223-negative terminal;

[0050] 1223a-third terminal;

[0051] 1223b-fourth terminal;

[0052] 123-through hole;

[0053] 1231-first through hole;

[0054] 1231a- extension;

[0055] 1232-second through hole;

[0056] 1233-third through hole;

[0057] 1234-fourth through hole;

[0058] 124-connection hole;

[0059] 13-capacitor core;

[0060] 131-core monomer;

[0061] 14-Insulation paper;

[0062] 15- heat sink;

[0063] 16- plastic injection;

[0064] 2-Tooling;

[0065] 21- bracket;

[0066] 211-first positioning plate;

[0067] 2111- convex part;

[0068] 212-second positioning plate;

[0069] 2121-positioning hole;

[0070] 22-Pressure plate.

[0071] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0072] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0073] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0074] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0075] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0076] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0077] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0078] The embodiment of the present application provides a capacitor assembly 1, such as Figure 1 ,and Figure 2 As shown, the capacitor assembly 1 includes a housing 11, a copper bar 12 and a capacitor core 13. The housing 11 includes a receiving cavity 111, and the copper bar 12 includes a positive copper bar 121 and a negative copper bar 122. Figure 4 As shown, the capacitor core 13 is located between the positive copper bar 121 and the negative copper bar 122 along the height direction. The positive copper bar 121 and the negative copper bar 122 are both provided with through holes 123, which are used to be filled with injection molding material 16 so that the capacitor core 13, the copper bar 12 and the housing 11 are fixed by the injection molding material 16.

[0079] When the capacitor core 13 and the positive and negative copper bars need to be encapsulated in the housing 11, the positive copper bar 121, the negative copper bar 122, and the capacitor core 13 are all placed in the accommodating cavity 111 of the housing 11, so that along the height direction of the capacitor core 13, the capacitor core 13 is located between the positive copper bar 121 and the negative copper bar 122, and there is a gap between the capacitor core 13, the positive copper bar 121, and the negative copper bar 122 and the housing 11. When the liquid injection plastic 16 is poured and injected on the top of the housing 11, the injection plastic 16 can flow into the housing 11 along the gap. The accommodating cavity 111 is capable of filling the gaps between the capacitor core 13 and the housing 11, the gaps between the positive copper bar 121 and the housing 11, and the gaps between the negative copper bar 122 and the housing 11. The injection molding compound 16 can flow along the through holes 123 provided in the positive copper bar 121 and the negative copper bar 122 into the gaps between the positive copper bar 121 and the capacitor core 13, and into the gaps between the negative copper bar 122 and the capacitor core 13, thereby filling the gaps between the positive copper bar 121 and the capacitor core 13, and into the gaps between the negative copper bar 122 and the capacitor core 13. After the injection molding compound 16 cools, it becomes solid, so that the capacitor core 13 and the positive and negative copper bars can be encapsulated in the housing 11, thereby improving the reliability of the capacitor assembly 1.

[0080] Therefore, through holes 123 are provided on the positive copper busbar 121 and the negative copper busbar 122 so that the liquid injection molding material 16 can flow into the gap between the positive and negative copper busbars, the capacitor core 13 and the shell 11, so as to reduce the generation of voids, which is beneficial to improving the reliability and stability of the connection between the various components of the capacitor assembly 1, and further beneficial to improving the electrical and mechanical properties of the capacitor assembly 1.

[0081] In addition, along the height direction of the capacitor core 13, the positive copper bar 121 and the negative copper bar 122 are located on both sides of the capacitor core 13, which can reduce the risk of short circuit between the positive copper bar 121 and the negative copper bar 122, and the capacitor core 13 can support the positive copper bar 121 and the negative copper bar 122, thereby improving the reliability of the capacitor core 13 and the positive copper bar 121 and the negative copper bar 122.

[0082] The copper bus 12 may be made of red copper, and the housing 11 may be made of injection molding material.

[0083] In one possible implementation, Figure 2 、 Figure 4-Figure 7 As shown, the positive copper busbar 121 includes a first body 1211 and a positive terminal 1213, the negative copper busbar 122 includes a second body 1221 and a negative terminal 1223, the capacitor core 13 is located between the first body 1211 and the second body 1221 in the height direction and is connected to the two, and the positive terminal 1213 and the negative terminal 1223 both extend out of the accommodating cavity 111.

[0084] The above-mentioned through hole 123 includes a first through hole 1231. The first body 1211 and the second body 1221 are both provided with a first through hole 1231. The first body 1211 and the capacitor core 13 are welded through the first through hole 1231 provided on the first body 1211, and the second body 1221 and the capacitor core 13 are welded through the first through hole 1231 provided on the second body 1221.

[0085] In this embodiment, the first body 1211 of the positive copper busbar 121 is welded to the upper surface of the capacitor core 13 through the first through-hole 1231, and the second body 1221 of the negative copper busbar 122 is welded to the lower surface of the capacitor core 13 through the first through-hole 1231. This allows the positive copper busbar 121 and the negative copper busbar 122 to be fixed to both sides of the capacitor core 13 along the height direction, thereby improving the reliability of the electrical connection between the capacitor core 13 and the positive and negative copper busbars. Furthermore, the first through-hole 1231 is provided in the first body 1211 and the second body 1221, allowing the injection molding material 16 to fill the gaps between the first body 1211 and the capacitor core 13, and between the second body 1221 and the capacitor core 13, through the first through-hole 1231, thereby improving the reliability of the connection between the capacitor core 13 and the positive and negative copper busbars.

[0086] The positive terminal 1213 of the positive copper busbar 121 and the negative terminal 1223 of the negative copper busbar 122 are used to electrically connect the capacitor core 13 to the battery and the IGBT. Specifically, the positive terminal 1213 includes a first terminal 1213a and a second terminal 1213b. The first terminal 1213a is used to connect to the positive electrode of the battery, and the second terminal 1213b is used to connect to the positive electrode of the IGBT. The second terminal 1213b is provided on the first body 1211. The negative terminal 1223 includes a third terminal 1223a and a fourth terminal 1223b. The third terminal 1223a is used to connect to the negative electrode of the battery, and the fourth terminal 1223b is used to connect to the negative electrode of the IGBT. This electrically connects the capacitor core 13 connected to the positive and negative copper busbars to the battery and the IGBT.

[0087] In a possible implementation manner, the number of the second terminal 1213b and the fourth terminal 1223b may be determined according to the model of the IGBT. Generally, the number of the second terminal 1213b and the fourth terminal 1223b is one or three.

[0088] In one possible implementation, Figure 4 、 Figure 6 and Figure 7 As shown, the side wall of the first through hole 1231 is provided with an extension portion 1231 a , and the capacitor core 13 and the copper busbar 12 are welded via the extension portion 1231 a .

[0089] In this embodiment, the first through hole 1231 is provided with an extension portion 1231a. During the injection process of the injection molding compound 16, the injection molding compound 16 can fill the first through hole 1231, thereby reducing the risk of separation of the extension portion 1231a from the capacitor core 13 and improving the reliability of the connection between the extension portion 1231a and the capacitor core 13. Furthermore, the extension portion 1231a extends along the width of the capacitor core 13, which increases the welding area between the extension portion 1231a and the capacitor core 13, thereby improving the reliability of the welding between the extension portion 1231a and the capacitor core 13, and further improving the reliability and stability of the welding between the positive and negative copper busbars and the capacitor core 13.

[0090] In one possible implementation, Figure 4-Figure 7 As shown, the positive copper busbar 121 further includes a third body 1212 vertically connected to the first body 1211, and the negative copper busbar 122 further includes a fourth body 1222 vertically connected to the second body 1221. Along the width direction of the capacitor core 13, the capacitor core 13 is located between the third body 1212 and the fourth body 1222.

[0091] The through hole 123 of the positive copper busbar 121 also includes a second through hole 1232, and the through hole 123 of the negative copper busbar 122 also includes a third through hole 1233 and a fourth through hole 1234. The second through hole 1232 is arranged at the connection between the first body 1211 and the third body 1212, the third through hole 1233 is arranged at the connection between the second body 1221 and the fourth body 1222, and the fourth through hole 1234 is arranged in the fourth body 1222.

[0092] In this embodiment, the first terminal 1213a is provided on the third body 1212 extending along the height direction of the capacitor assembly 1, which is conducive to increasing the area of ​​the positive copper busbar 121, thereby facilitating heat dissipation. At the same time, since the third terminal 1223a and the fourth terminal 1223b are narrow in the length direction of the capacitor assembly 1, the third terminal 1223a and the fourth terminal 1223b are provided on the fourth body 1222 extending along the height direction of the capacitor assembly 1, thereby increasing the conductive area, that is, the size of the fourth body 1222 along the length direction of the capacitor assembly 1 is larger than the size of the third terminal 1223a and the fourth terminal 1223b directly provided on the second body 1221, and is conducive to reducing the size of the third terminal 1223a and the fourth terminal 1223b extending along the height direction, thereby facilitating reducing the loop impedance, so that the third terminal 1223a and the fourth terminal 1223b have good conductivity. In addition, the area of ​​the negative copper busbar 122 is increased by the fourth body 1222, thereby facilitating heat dissipation. A certain gap should be provided between the third body 1212 and the fourth body 1222 along the height direction of the capacitor assembly 1 to reduce the risk of interference. While maintaining this certain gap, the size of the fourth body 1222 along the height direction of the capacitor assembly 1 can be appropriately increased, which is beneficial for further improving the conductivity and heat dissipation capabilities of the third terminal 1223a and the fourth terminal 1223b.

[0093] In addition, a gap may exist between the third body 1212 and the fourth body 1222 and the sidewall of the battery cell 13, and the third body 1212 and the fourth body 1222 act as a constraint on the capacitor core 13. The second through hole 1232 is provided at the connection between the first body 1211 and the third body 1212, so that the injection plastic 16 can fill the gap between the positive copper busbar 121 and the capacitor core 13 at the connection between the first body 1211 and the third body 1212 through the second through hole 1232. The injection plastic 16 can also flow into the gap between the third body 1212 and the sidewall of the battery cell 13 through the second through hole 1232, thereby reducing the risk of voids forming between the capacitor core 13 and the positive copper busbar 121. The third through hole 1233 is provided at the junction of the second body 1221 and the fourth body 1222, allowing the injection plastic 16 to fill the gap between the negative copper busbar 122 and the capacitor core 13 at the junction of the second body 1221 and the fourth body 1222 through the third through hole 1233. The injection plastic 16 can also flow into the gap between the fourth body 1222 and the side wall of the battery cell 13 through the third through hole 1233, thereby reducing the risk of voids forming between the capacitor core 13 and the negative copper busbar 122. Simultaneously, the fourth through hole 1234 is provided in the fourth body 1222, allowing the injection plastic 16 to further fill the gap between the fourth body 1222 and the side wall of the capacitor core 13 through the fourth through hole 1234, further reducing the risk of voids forming between the capacitor core 13 and the negative copper busbar 122 and improving the electrical and mechanical properties of the capacitor assembly 1.

[0094] The first body 1211 and the third body 1212 of the positive copper busbar 121 can be integrally formed by stamping and bending, and the second body 1221 and the fourth body 1222 of the negative copper busbar 122 can be integrally formed by stamping and bending.

[0095] In summary, through the through holes 123 located around the capacitor core 13, the injection plastic 16 can flow into the various gaps between the positive and negative copper bars and the capacitor core 13 in all directions, greatly improving the reliability of the injection plastic 16 filling the gaps, thereby greatly reducing the risk of voids forming between the capacitor core 13 and the positive and negative copper bars.

[0096] In one possible implementation, Figure 2 、 Figure 6 and Figure 7 As shown, the capacitor core 13 includes a plurality of core monomers 131 distributed along the length direction, and the first body 1211 and the second body 1221 are both provided with a plurality of first through holes 1231 distributed at intervals along the length direction, and each first through hole 1231 is used for welding with each core monomer 131.

[0097] In this embodiment, the capacitor core 13 has multiple core cells 131 along its length. The capacitor core 13 is installed in the housing 11 so that the multiple core cells 131 are all located within the housing 11. Compared with the traditional method of individually soldering multiple capacitor cells to a PCB board, the multiple core cells 131 of the present application are located within the housing 11, which can improve the integration level of the capacitor assembly 1. At the same time, the first body 1211 and the second body 1221 are both provided with multiple first through holes 1231 spaced apart along their length, so that the extension portion 1231a in each first through hole 1231 can be welded to each core cell 131, further improving the stability and reliability of the welding of the positive and negative copper busbars to each core cell 131.

[0098] In addition, the injection molding material 16 can flow into the gaps between the core monomers 131 through the through holes 123 , thereby reducing the risk of voids in the core monomers 131 and improving the electrical and mechanical properties of the capacitor core 13 .

[0099] In one possible implementation, Figure 1 As shown, the housing 11 is provided with a blocking portion 112 for separating adjacent positive terminals 1213 and negative terminals 1223 .

[0100] In this embodiment, the shell 11 is provided with a blocking portion 112 extending along the height direction of the capacitor core 13. The blocking portion 112 can separate the first terminal 1213a of the positive terminal 1213 and the third terminal 1223a of the negative terminal 1223, thereby reducing the risk of close creepage between the first terminal 1213a and the third terminal 1223a along the length direction of the capacitor core 13, which is beneficial to improving the reliability and safety of the operation of the capacitor assembly 1.

[0101] In one possible implementation, Figure 2 and Figure 4 As shown, along the width direction, an insulating paper 14 is provided between the positive copper busbar 121 and the negative copper busbar 122 .

[0102] In this embodiment, along the width direction of the capacitor core 13, the insulating paper 14 is used to separate the positive terminal 1213 of the positive copper busbar 121 and the negative terminal 1223 of the negative copper busbar 122, thereby reducing the risk of creepage between the positive terminal 1213 and the negative terminal 1223 along the width direction, thereby reducing the risk of short circuit in the capacitor assembly 1 and improving the safety of the capacitor assembly 1.

[0103] In addition, along the height direction of the capacitor core 13, the positive copper bar 121 and the negative copper bar 122 are located on both sides of the capacitor core 13. Compared with the positive and negative copper bars being located on one side of the capacitor core 13, the amount of insulating paper 14 between the positive copper bar 121 and the negative copper bar 122 can be reduced, thereby reducing production costs and preventing the inconvenience caused by arranging larger insulating paper 14, thereby reducing assembly efficiency.

[0104] In one possible implementation, Figure 2 and Figure 3 As shown, the capacitor assembly further includes a heat sink 15 mounted on the housing 11 . The bottom wall of the housing 11 is provided with an opening 113 . The heat sink 15 dissipates heat through the opening 113 . An insulating paper 14 is provided between the heat sink 15 and the negative copper busbar 122 .

[0105] In this embodiment, the heat sink 15 can be a heat dissipation aluminum plate, and the heat dissipation aluminum plate has good thermal conductivity. The heat dissipation aluminum plate can dissipate heat through the opening 113, thereby reducing the temperature of the capacitor assembly 1 during operation, so as to improve the performance and service life of the capacitor assembly 1. At the same time, due to the good electrical conductivity of the heat dissipation aluminum plate, an insulating paper 14 is provided between the heat sink 15 and the negative copper bar 122 to further reduce the risk of the capacitor assembly 1 generating a short circuit, so as to improve the safety of the capacitor assembly 1. In addition, the negative copper bar 122 and the positive copper bar 121 are located on both sides of the capacitor core 13, that is, when the negative copper bar 122 is located at the bottom of the capacitor core 13, the negative copper bar 122 can dissipate heat by being arranged on the heat sink 15 at the bottom of the housing 11, thereby reducing the temperature of the negative copper bar 122 and improving the working stability of the capacitor core 13.

[0106] In one possible implementation, Figure 2 As shown, a reinforcing rib 1111 is provided in the accommodating cavity 111 of the shell 11 to improve the strength of the shell 11 .

[0107] The embodiment of the present application provides a tool 2, such as Figure 8 As shown, the tooling 2 is used to fix the capacitor assembly 1 during the injection molding process. The tooling 2 includes a bracket 21 and a pressure plate 22. The bracket 21 is used to support the capacitor assembly 1. The capacitor assembly 1 is the capacitor assembly 1 in any of the above embodiments. The pressure plate 22 is installed on the bracket 21, and the pressure plate 22 can move toward or away from the bracket 21.

[0108] When the capacitor assembly 1 needs to be injection molded, the shell 11 of the capacitor assembly 1 is placed on the bracket 21 so that the shell 11 is fixed to the bracket 21, and then the pressure plate 22 is driven to move toward the capacitor assembly 1 so that the pressure plate 22 is pressed down on the positive and negative copper bars, and then the pressure plate 22 can be used to fix the copper bars 12 of the capacitor assembly 1, and then the liquid injection plastic 16 is poured and injected on the top of the capacitor assembly 1 to complete the injection molding, and then the pressure plate 22 moves away from the capacitor assembly 1 to remove the injection molded capacitor assembly 1. Therefore, the shell 11 can be fixed relative to the tooling 2 by the injection molding of the tooling 2, and the positive and negative copper bars are fixed relative to the tooling 2, and then the shell 11 can be fixed relative to the positive and negative copper bars, so as to improve the accuracy of the relative positions of the internal components of the capacitor assembly 1, so that the capacitor core 13 has good electrical and mechanical properties after injection molding, and is conducive to improving the injection molding efficiency.

[0109] The tooling 2 can be externally connected to a drive motor or a drive hydraulic cylinder so that the pressing plate 22 can move in the height direction relative to the bracket 21 .

[0110] In one possible implementation, Figure 9 and Figure 10 As shown, the capacitor assembly 1 includes a mounting portion 114 . Along the height direction of the capacitor core 13 , the mounting portion 114 is provided with a protruding positioning column 1141 , and the bracket 21 is provided with a positioning hole 2121 that cooperates with the positioning column 1141 .

[0111] In this embodiment, the mounting portions 114 on both sides of the capacitor assembly 1 along the length direction are provided with positioning columns 1141, and the bracket 21 also includes a first positioning plate 211 distributed along the length direction. The positioning holes 2121 are provided on the first positioning plate 211. The positioning holes 2121 cooperate with the positioning columns 1141 to enable the shell 11 to be fixed to the tooling 2. At the same time, the positioning holes 2121 cooperate with the positioning columns 1141 to improve the accuracy of fixing the capacitor assembly 1 to the tooling 2, thereby improving the injection molding efficiency.

[0112] After the injection molding is completed, the capacitor assembly 1 is installed in the motor controller through the installation portion 114 .

[0113] In addition, if Figure 1 and Figure 8 As shown, the bracket 21 includes a protrusion 2111, the positive copper busbar 121 includes a positive terminal 1213, the negative copper busbar 122 includes a negative terminal 1223, and the positive terminal 1213 and the negative terminal 1223 both include a connecting hole 124, which can cooperate with the protrusion 2111 to position the positive terminal 1213 and the negative terminal 1223.

[0114] In this embodiment, the bracket 21 further includes a second positioning plate 212 distributed along the width direction, and the protrusion 2111 is provided on the second positioning plate 212. When the housing 11 is fixed to the tooling 2, the connection hole 124 can cooperate with the protrusion 2111, and then the pressure plate 22 can be pressed on the positive terminal 1213 and the negative terminal 1223 to limit the connection hole 124 and the protrusion 2111 to maintain a cooperative state, so that the positive and negative copper bars can be fixed relative to the tooling 2 during the injection molding process, and then the positive and negative copper bars can be fixed relative to the housing 11, thereby improving the accuracy of the relative positions of the internal components of the capacitor assembly 1, so that the capacitor core 13 has good electrical and mechanical properties after injection molding.

[0115] The above description is merely a specific implementation of the embodiments of the present application, but the scope of protection of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application shall be included in the scope of protection of the embodiments of the present application. Therefore, the scope of protection of the embodiments of the present application shall be based on the scope of protection of the claims.

Claims

1. A capacitor assembly, characterized in that: The capacitor assembly includes: a housing, the housing comprising a receiving cavity; Copper busbars, including positive copper busbars and negative copper busbars; A capacitor core, the capacitor core being located between the positive copper busbar and the negative copper busbar along a height direction; Wherein, the positive copper busbar and the negative copper busbar are both provided with through holes, and the through holes are used to be filled with injection molding material, so that the capacitor core, the copper busbar and the shell are fixed by the injection molding material.

2. The capacitor assembly according to claim 1, wherein: The positive copper busbar includes a first body and a positive terminal, and the negative copper busbar includes a second body and a negative terminal. The capacitor core is located between the first body and the second body in the height direction and is connected to the first body and the second body. The positive terminal and the negative terminal both extend out of the accommodating cavity. The through hole includes a first through hole, and the first body and the second body are both provided with the first through hole. The first body and the capacitor core are welded through the first through hole provided in the first body, and the second body and the capacitor core are welded through the first through hole provided in the second body.

3. The capacitor assembly according to claim 2, wherein: An extension portion is provided on the side wall of the first through hole, and the capacitor core and the copper busbar are welded via the extension portion.

4. The capacitor assembly according to claim 2, wherein: The capacitor core includes a plurality of core monomers distributed along the length direction. The first body and the second body are both provided with a plurality of first through holes distributed at intervals along the length direction. Each of the first through holes is used for welding with each of the core monomers.

5. The capacitor assembly according to claim 2, wherein: The housing is provided with a blocking portion for separating the adjacent positive electrode terminals and the negative electrode terminals.

6. The capacitor assembly according to claim 2, wherein: The positive copper busbar further includes a third body vertically connected to the first body, and the negative copper busbar further includes a fourth body vertically connected to the second body. Along the width direction of the capacitor core, the capacitor core is located between the third body and the fourth body. The through hole of the positive copper busbar further includes a second through hole, and the through hole of the negative copper busbar further includes a third through hole and a fourth through hole, the second through hole is arranged at the connection between the first body and the third body, the third through hole is arranged at the connection between the second body and the fourth body, and the fourth through hole is arranged in the fourth body.

7. The capacitor assembly according to any one of claims 1 to 6, characterized in that: Insulation paper is provided between the positive electrode copper busbar and the negative electrode copper busbar along the width direction.

8. The capacitor assembly according to any one of claims 1 to 6, characterized in that: The capacitor assembly further includes a heat sink mounted on the housing. The bottom wall of the housing is provided with an opening through which the heat sink dissipates heat. Insulation paper is provided between the heat sink and the negative copper busbar.

9. A tool for fixing the capacitor assembly during the injection molding process, characterized in that: The tooling includes: A bracket, the bracket being used to support the capacitor assembly, wherein the capacitor assembly is the capacitor assembly according to any one of claims 1 to 8; A pressing plate is mounted on the bracket and can move toward or away from the bracket.

10. The tooling according to claim 9, characterized in that: The capacitor assembly includes a mounting portion, wherein the mounting portion is provided with a protruding positioning column along the height direction of the capacitor core, and the bracket is provided with a positioning hole that cooperates with the positioning column; The bracket includes a protrusion, the positive copper busbar includes a positive terminal, the negative copper busbar includes a negative terminal, and the positive terminal and the negative terminal both include connection holes, which can cooperate with the protrusion to position the positive terminal and the negative terminal.

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