Filter device and electric drive assembly

Abstract

The utility model provides a filter device and an electric drive assembly, and the filter device comprises a housing which is provided with a mounting groove and is used for being assembled on the electric drive assembly; the filtering assembly is arranged in the mounting groove; wherein a grounding end in the filtering assembly is provided with a welding area connected with the shell, and the grounding end is welded to the shell through the welding area, so that grounding of the filtering assembly is realized. Through the electric drive assembly provided by the utility model, the problems that the size and the weight of a motor controller are increased, chips are easy to generate and the like due to screw grounding of a traditional filter are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric drive assembly, in particular to a filter device and electric drive assembly. BACKGROUND

[0002] The new energy motor controller is usually provided with a filter. The filter is used to filter out the noise generated during the operation of the product, thereby ensuring that the product meets the electromagnetic compatibility requirements. At present, the filter is mostly integrated by injection molding shell with capacitors, inductors, copper bars and other components, and then the filter is fixed on the controller shell through screws, and the filter is grounded through screws. However, the screw connection grounding mode makes the controller assembly process complex, and the screw needs a sleeve to avoid space, which increases the volume of the controller to some extent. At the same time, the screw assembly process will produce debris, affecting the electrical safety of the controller. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the utility model provides a filter device and electric drive assembly to solve the problems of the volume and weight increase of the motor controller caused by the screw grounding of the traditional filter, and the generation of debris.

[0004] The utility model discloses a filter device in the first aspect, adopts the technical scheme:

[0005] A filter device, the filter device comprises:

[0006] A shell is provided with a mounting groove, and the shell is used for assembling to the electric drive assembly;

[0007] A filter assembly is arranged in the mounting groove;

[0008] Among them, the grounding end in the filter assembly is provided with a welding area connected with the shell, and the grounding end is welded to the shell through the welding area to realize the grounding of the filter assembly.

[0009] As one of the preferred schemes, the mounting groove and the filter assembly are encapsulated with an encapsulating piece.

[0010] As one of the preferred schemes, the encapsulating piece is formed by epoxy resin curing.

[0011] As one of the preferred schemes, the shell is provided with a liquid cooling channel, and the position of the liquid cooling channel corresponds to the position of the mounting groove.

[0012] As one of the preferred schemes, the shell is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively communicated with the liquid cooling channel.

[0013] As one of the preferred solutions, the liquid cooling channel is located below the groove bottom wall of the mounting groove, and the outer edge contour of the liquid cooling channel matches the outer edge contour of the groove bottom wall.

[0014] As one of the preferred solutions, the grounding end is laser welded on the groove bottom wall of the mounting groove through the welding area.

[0015] As one of the preferred solutions, the shell is configured to be aluminum injection molded.

[0016] As one of the preferred solutions, the filter assembly includes a capacitor grounding aluminum bar, and the grounding end is the capacitor grounding aluminum bar.

[0017] In a second aspect, the utility model provides a kind of electric drive assembly, including motor controller, the direct current port of the motor controller is connected with filter device, and the filter device is the filter device provided in the utility model first aspect.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The filter device provided in the embodiment of the utility model, the filter device includes: a shell, a mounting groove is opened, and the shell is used to be assembled to electric drive assembly;Filter assembly is arranged in the mounting groove;Wherein, the grounding end in the filter assembly is provided with a welding area connected with the shell, and the grounding end is welded to the shell through the welding area, to realize the grounding of the filter assembly.

[0020] By adopting the scheme of the present application, the grounding end of the filter assembly in the utility model is connected with the shell in a welded manner, the traditional filter is cancelled by screw grounding mode, effectively reduces the sleeve space required by screw, and the grounding end and the shell are connected by welding, so the welding form is various, so the diversity of component arrangement scheme is increased, which is beneficial to reduce the weight and volume of motor controller, and meanwhile, the generation of debris is avoided.

[0021] The electric drive assembly and the filter device have the same advantages as the prior art, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0023] Figure 1 It is the overall structure of the filter device described in an embodiment of the present application.

[0024] Figure 2 yes Figure 1 A magnified view of a section at point G in the middle;

[0025] Figure 3 This is a perspective structural diagram of the housing described in one embodiment of this application;

[0026] Figure 4 This is a three-dimensional structural diagram of the filtering component described in one embodiment of this application;

[0027] Figure 5 This is a three-dimensional structural diagram of the package described in one embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Housing; 11. Liquid inlet; 12. Liquid outlet; 13. Mounting slot; 2. Filter assembly; 2.1. Filter inductor; 2.2. Insulating paper; 2.3. Positive copper busbar; 2.4. Negative copper busbar; 2.5. Y capacitor grounding aluminum busbar; 2.6. Y capacitor; 2.7. X capacitor; 2.8. Adapter copper busbar; 3. Package. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It is known that most current new energy motor controllers use filters that integrate components such as capacitors, inductors, and copper busbars through injection-molded housings. These filters are then fixed to the controller housing with screws, which are used to ground the filter. However, this screw-fixed grounding method complicates the controller assembly process. The screws require sleeve clearance, increasing the controller's size to some extent. Furthermore, screw assembly generates debris, which can affect the electrical safety within the controller.

[0032] In addition, the busbars, capacitors and inductors inside the filter are fixed by a plastic shell, which complicates the process. Furthermore, the poor thermal conductivity of plastic is not conducive to heat dissipation of the components inside the filter. In addition, the electrical clearance and creepage distance requirements of the injection molding design further increase the complexity of the plastic shell, thus leading to an increase in the size of the filter.

[0033] like Figures 1-5 As shown, Figure 1 A top view of the overall structure of the filter device of this utility model is shown; Figure 2 It shows Figure 1 A magnified view of point G in the image; Figure 3The utility model discloses a shell's stereogram is shown. Figure 4 The utility model discloses a filter assembly's stereogram is shown. Figure 5 The utility model discloses a packaging piece's stereogram is shown.

[0034] As Figures 1-4 The utility model provides a kind of filter device, filter device includes: shell 1, is equipped with installation groove 13, shell 1 is used to assemble to electric drive assembly;Filter assembly 2 is set in installation groove 13;Wherein, the grounding end in filter assembly 2 is provided with the welding area connected with shell 1, grounding end is welded to shell 1 by welding area, to realize the grounding of filter assembly 2.

[0035] In the embodiment, the main purpose is to provide integrated filter device for electric drive assembly, filter out electromagnetic interference generated in the work of electric drive assembly, to improve the electromagnetic compatibility of system.The filter device provided in the embodiment can be applied to various types of electric drive assembly, especially suitable for motor controller in new energy automobile driving system, also suitable for controller in industrial automation equipment, household appliance, audio equipment and other systems.

[0036] Wherein shell 1 as a part of controller, usually located outside controller, surrounds and protects entire controller system to prevent electromagnetic radiation interference.In the embodiment shell 1 also as the external support and protection structure of filter assembly 2, for installing and connecting filter assembly 2, and provide grounding and shielding function.

[0037] It can be known that the embodiment is applicable to different electric drive assembly, wherein the design of shell 1 is usually adapted according to the shape and functional requirements of electric drive assembly, usually including special mounting structure, such as flange, heat sink or bolt hole etc..Therefore the shell 1 of the embodiment can be specific for different electric drive assembly corresponding matching shell 1, the specific shape of shell 1 is not limited in the embodiment. Figure 3 As shown in the figure, shell 1 is the shell 1 used for motor controller of new energy automobile.

[0038] Hereinafter Figure 3As shown in the housing 1, the mounting groove 13 is a slot opening on the housing 1 for facilitating the installation of the filter assembly 2, and the size and shape of the mounting groove 13 match those of the filter assembly 2, so that the filter assembly 2 is just accommodated and plays a role in preliminarily fixing the filter assembly 2, thereby ensuring that the filter assembly 2 does not move and maintains its electrical connection when integrated in the electric drive assembly. The filter assembly 2 is integrated into the electric drive assembly through the mounting groove 13 of the housing 1, the connection between the filter and the controller is more compact, the length and complexity of the connection cable are reduced, the space required for separately arranging the filter housing is reduced, and the overall device is more compact.

[0039] In the present embodiment, when the filter assembly 2 is placed in the mounting groove 13, it can be further fixed by a connecting piece, which can be the packaging piece 3 described below.

[0040] It can be understood that the filter assembly 2 is mainly responsible for noise filtering and electromagnetic compatibility control, and generally includes inductive filter assembly, capacitive filter assembly, resistive filter assembly, and composite filter assembly, etc. Therefore, the type of the filter assembly 2 is different, and the structure of the corresponding mounting groove 13 is also different. The specific structure of the filter assembly 2 and the mounting groove 13 is not limited in the present embodiment, and the mounting groove 13 is preferably adapted to just accommodate the filter assembly 2. For example, Figure 3 and Figure 4 As shown, the mounting groove 13 is a special-shaped mounting groove 13 adapted to the commonly used filter assembly 2 of the motor controller, and a metal part for connecting with the welding area is arranged in the mounting groove 13. Figure 1 As shown in the top view of the filter assembly 2 installed in the housing 1 shown in Figure 4 As shown in the top view of the filter assembly 2 installed in the housing 1 shown in Figure 3 As shown in the top view of the filter assembly 2 installed in the housing 1 shown in Figure 2 As shown in the top view of the filter assembly 2 installed in the housing 1 shown in Figure 1 As shown in the top view of the filter assembly 2 installed in the housing 1 shown in

[0041] The ground terminal refers to an electrical connection part for realizing the grounding function of the filter assembly 2. The ground terminal of the filter is connected with the metal part of the housing 1 through the welding area, which can be understood as the corresponding welding interface between all elements needing grounding in the filter and the metal part of the housing 1. According to different types of filter assembly 2, the ground terminal is usually different. For example, the ground terminal can include the ground terminal of Y capacitor 2.6, ground aluminum strip, and other electrical components needing grounding.

[0042] For example, the filter assembly 2 provided with Y capacitor 2.6 is usually used to filter common mode noise, one end of which is connected to the positive or negative pole of the power supply, and the other end is directly grounded or grounded through a connecting piece. Therefore, the ground terminal can be the ground terminal of the Y capacitor 2.6 or the ground aluminum strip connected with the Y capacitor 2.6.

[0043] For example, other components in the filter can also be designed with grounding functions, such as inductors, filter copper bars, and other existing electromagnetic shielding metal parts, etc., so these parts can also be used as grounding ends, which are connected with the shell 1 of the electric drive assembly through the welding area to realize the electrical grounding function together, so as to ensure the electromagnetic compatibility of the entire filtering system.

[0044] Therefore, the welding area in the embodiment is the connection area between the determined grounding end and the shell 1 of the electric drive assembly, which ensures the close electrical connection between the grounding end and the shell 1, and fixes the required grounding end and conducts the grounding current through welding.

[0045] Specifically, the welding area can be the entire area or a partial area of the grounding end; that is, the entire grounding end is connected with the shell 1 through welding, or a part of the grounding end is connected with the shell 1 through welding.

[0046] Correspondingly, the area corresponding to the shell 1 and the grounding end is usually reserved with a special metal part, such as a metal protrusion or a grounding column, which is connected with the grounding end (such as the Y capacitor grounding aluminum bar 2.5) of the filter through the welding area, so as to ensure the grounding performance of the entire electrical system.

[0047] As a specific explanation of the embodiment, the shape of the welding area can be variously set according to specific design and functional requirements, for example, spot welding, line welding, surface welding, ring welding, T-shaped welding, and butt welding can be used, so that the welding area is correspondingly set as a point, a strip, a surface, a ring, a T-shaped shape, and a V-shaped weld seam, etc.

[0048] Further, the connection mode of the welding area and the shell 1 can also be selected according to specific design requirements and process requirements, for example, laser welding, resistance welding, gas shielded welding, electric arc welding, and ultrasonic welding, etc.

[0049] Among them, the number and shape of the welding area directly affect the welding quality and grounding effect. In the embodiment, the welding area is preferably the entire grounding end, and is set as a planar shape for easy welding, which has a large contact area with the groove wall surface of the mounting groove 13 of the shell 1 and is welded together by laser welding, so as to weld the entire area of the grounding end together, so that the grounding of the filter is more firm and reliable, and at the same time plays a role in fixing the shell 1 and the filter assembly 2.

[0050] In this way, the grounding end of the filter assembly 2 in the utility model is connected with the shell 1 in a welding manner, which cancels the traditional grounding mode of the filter through screws, effectively reduces the required sleeve space of the screws, and the welding area of the filter assembly 2 and the welding seam form of the motor shell are various, so the diversity of the component arrangement scheme is increased, which is beneficial to reduce the weight and volume of the motor controller, and at the same time avoids the generation of debris.

[0051] It can also be known that the shell 1 of different types of electric drive assemblies generally includes a metal shell, a plastic shell or a composite material shell, etc. The present embodiment is mainly applicable to the motor controller of a new energy vehicle. The shell 1 of the motor controller is generally made of metal material, such as aluminum alloy, magnesium alloy or metal composite profile with good heat dissipation performance. Laser welding is to locally heat the metal to the melting point by using a high-power laser beam, which has very high precision and low heat-affected zone, and is suitable for electronic devices with strict requirements. Therefore, laser welding is suitable for the shell 1 of metal profile, which has high welding strength and vibration resistance, and can better adapt to the vibration and impact environment of the electric drive assembly in operation.

[0052] The mounting groove 13 of the shell 1 is generally a cavity structure with one side open, as shown in Figure 3 When the filter assembly 2 is assembled into the mounting groove 13, the top surface is exposed, and the bottom wall and the surrounding side wall are in contact with the groove bottom wall and the surrounding groove side wall of the mounting groove 13. The metal part reserved in the shell 1 can be arranged in the mounting groove 13 and close to the groove side wall of the mounting groove 13. The grounding end can be directly welded to the metal part in the mounting groove 13 of the shell 1 in the direction of the bottom. The rear welding area is opposite to the groove bottom wall and is coupled to the groove bottom wall. Therefore, laser welding can quickly fix the grounding end to the shell 1, and is suitable for local connection of metal elements. Compared with screw fixing, no metal debris or other impurities will be generated during the welding process, which effectively avoids the potential impact on the electrical performance of the controller.

[0053] In some embodiments, a liquid cooling channel is arranged in the shell 1 corresponding to the position of the groove bottom wall. The liquid cooling channel can provide a good heat conduction path for the filter assembly 2, quickly dissipate the heat of the filter assembly 2 through the shell 1, and thus improve the heat dissipation efficiency of the components.

[0054] As a preferred embodiment of the present embodiment, the shell 1 is configured to be aluminum injection molded. In the present embodiment, the shell 1 is an A380 aluminum shell. A380 has good fluidity and thermal cracking resistance, is suitable for injection molding and connection of complex shell 1, and is suitable for use as electromagnetic shielding and heat dissipation. Therefore, during the laser welding process, the aluminum profile has a lower melting point, which is more conducive to the rapid heating and melting of laser welding, and is friendly to laser welding, thereby simplifying the process and enhancing the electrical grounding performance.

[0055] Correspondingly, the grounding end is also made of aluminum profile and is laser welded with the aluminum shell. Therefore, the grounding end is also preferably a grounding aluminum bar of the filter assembly 2.

[0056] More preferably, the welding area of the grounding aluminum bar can be designed to have a plating layer or a surface treatment layer with enhanced conductivity.

[0057] As a preferred design of the embodiment, another object of the embodiment is to solve the problem of complex process and poor heat dissipation performance of the conventional filter fixed by an injection molding shell. The mounting groove 13 and the filter assembly 2 are encapsulated with the encapsulant 3.

[0058] In the embodiment, the filter device as a whole adopts a resin encapsulation process, and the resin fills the gaps inside the filter assembly 2 and the gaps with the shell 1. After the resin is cured, the encapsulant 3 is formed. The components inside the filter assembly 2 are fixed in the shell 1 of the controller through the encapsulant 3. Therefore, the encapsulant 3 is closely attached to the inner wall of the shell 1, reducing the influence of vibration on the filter assembly 2 and improving the mechanical strength. As shown in Figure 5 Figure 5 The outer edge profile of the encapsulant 3 in Figure 3 matches the inner edge profile of the mounting groove 13 in Figure 4 and covers the circumferential surface of the components in

[0059] Specifically, the encapsulant 3 covers the filter assembly 2, and the epoxy resin is injected to fill the internal gaps of the filter assembly 2 and cover the surfaces of the components. The filter assembly 2 is located in the mounting groove 13, and the top is flush with or slightly lower than the top opening of the mounting groove 13. The epoxy resin is injected into the mounting groove 13, and the encapsulant 3 after curing wraps the internal gaps of the components in the filter assembly 2 and the gaps with the mounting groove 13, while covering the top of the filter assembly 2, sealing the top opening of the mounting groove 13, and thus completely wrapping the filter assembly 2 to achieve waterproof, moisture-proof, and dust-proof performance, protecting the capacitors and other sensitive electronic components.

[0060] In the embodiment, the encapsulant 3 can be made of polyester resin, epoxy resin, and other materials with good elasticity and mechanical strength, which are suitable for fixing and protecting electrical components.

[0061] In some embodiments, the filter assembly 2 can also be fixed in the mounting groove 13 by an adhesive, such as epoxy glue, cyanoacrylate glue, etc.

[0062] In some embodiments, it can be fixed by metal welding and then encapsulated with resin.

[0063] In some embodiments, the encapsulant 3 can be integrated (whole encapsulation) or divided (segmented fixation).

[0064] ​Preferably, the encapsulant 3 is an epoxy resin with high thermal conductivity. The filter device as a whole adopts an epoxy resin pouring process, and the components are fixed in the mounting groove 13 of the shell 1 through the epoxy resin. The internal gap of the filter assembly 2 is filled with epoxy resin, the required insulation gap is reduced, the product volume is reduced, and the thermal conductivity of the epoxy resin is relatively high, which can quickly transfer the heat generated by the components in the filter to the shell 1, realizing the functions of compactness, high-efficiency heat dissipation, moisture-proofing, fixation, etc.

[0065] In some embodiments, the positive copper bar 2.3 and the negative copper bar 2.4 of the filter assembly 2 extend out of the mounting groove 13 in a direction away from the mounting groove 13, for connection with the positive and negative terminals of the power supply. Therefore, the encapsulant 3 after curing and forming can cover other components of the filter assembly except the positive copper bar 2.3 and the negative copper bar 2.4.

[0066] In further technical solutions, the side of the shell 1 in contact with the filter assembly 2 is provided with a liquid cooling channel. When the filter assembly 2 is contained in the mounting groove 13, the bottom wall and the four surrounding side walls thereof are in contact with the mounting groove 13. Therefore, in the present embodiment, the bottom and the four surrounding side surfaces of the shell 1 can be provided with liquid cooling channels to semi-enclose the filter assembly 2 for heat dissipation.

[0067] Preferably, the liquid cooling channel is provided at the bottom of the shell 1, and the bottom wall of the mounting groove 13 serves as the channel wall of the liquid cooling channel, shortening the heat transfer path of the liquid cooling channel and the filter assembly 2 in the mounting groove 13. The liquid cooling channel circulates cooling liquid, which is integrated in the shell 1 and directly contacts the filter assembly 2, thereby not only reducing the volume occupation of the heat dissipation module, but also efficiently removing the heat generated by the filter assembly 2 through liquid circulation.

[0068] In some embodiments, the liquid cooling channel can be a large-area cavity.

[0069] In some embodiments, the liquid cooling channel includes a plurality of heat dissipation channels. The plurality of heat dissipation channels can be distributed in a matrix, a serpentine or a ring shape, and are uniformly arranged in the heat source region of the filter assembly 2.

[0070] Further, the shell 1 is provided with an inlet 11 and an outlet 12, the inlet 11 and the outlet 12 are respectively in communication with the liquid cooling channel, and the inlet 11 and the outlet 12 are diagonally arranged.

[0071] In the present embodiment, the inlet 11 and the outlet 12 can be arranged outside the mounting groove 13 of the shell 1 to avoid interference with the filter assembly 2, and are adjacent to the mounting groove 13 to reduce the area occupied by the liquid cooling channel. The diagonal arrangement of the inlet 11 and the outlet 12 enables the cooling liquid to flow through the entire liquid cooling channel, forming a long flow path from one end to the other end, thereby facilitating efficient heat dissipation of the filter assembly 2.

[0072] Further, the mounting groove 13 is overlapped with the bottom projection of the liquid cooling channel in the plane of the housing 1. In this embodiment, the filter assembly 2 is fixed in the mounting groove 13, sharing the space of the bottom area with the liquid cooling channel, and heat can be directly conducted from the filter assembly 2 to the liquid cooling channel through the mounting groove 13, quickly dissipating heat. The liquid cooling channel is located below the groove bottom wall of the mounting groove 13, and the outer edge contour of the liquid cooling channel matches the outer edge contour of the groove bottom wall, so that when the filter assembly 2 is installed in the mounting groove 13, the entire bottom of the filter assembly 2 is in contact with the groove bottom wall of the mounting groove 13. The liquid cooling channel is designed below the groove bottom wall, so that the filter assembly 2 in the mounting groove 13 can be directly and quickly cooled. Then according to the shape and size of the groove bottom wall of the mounting groove 13, the shape and size of the liquid cooling channel are designed, when the edge of the liquid cooling channel is flush with the edge of the groove bottom wall, at this time the two are completely overlapped, so that the flow area of the cooling liquid in the liquid cooling channel is just in contact with the entire bottom of the filter assembly 2 located in the mounting groove 13, realizing effective cooling of the filter assembly 2, while reducing the occupied space of the liquid cooling channel. Through structural integration, the space in the housing 1 is effectively saved, which is suitable for the application scene of the motor controller of the new energy vehicle which is sensitive to size and weight.

[0073] In the electric drive assembly of the new energy vehicle, the stability of the current and voltage signals is required, and the motor controller usually needs filter devices to suppress electromagnetic interference and filter harmonic noise. In order to adapt to the wide application of market demand, the following provides a filter assembly structure commonly used in the motor controller of the new energy vehicle: the filter assembly 2 usually includes a filter inductor 2.1, a filter capacitor, a capacitor ground aluminum strip, an insulating layer, a positive copper strip 2.3, a negative copper strip 2.4 and a transition copper strip 2.8; the filter capacitor (Y capacitor) is usually connected with the capacitor ground aluminum strip, and the capacitor ground aluminum strip serves as a ground terminal.

[0074] As a specific explanation of this embodiment, the filter inductor 2.1 is provided with two, specifically a first filter inductor and a second filter inductor; the positive copper strip 2.3 is provided with two, specifically a first positive copper strip and a second positive copper strip; the negative copper strip 2.4 is provided with two, specifically a first negative copper strip and a second negative copper strip; the insulating layer is provided with two, and the insulating layer selects an insulating paper 2.2, specifically a first insulating paper and a second insulating paper; the filter capacitor is provided with two groups, specifically a first filter capacitor and a second filter capacitor, wherein the first filter capacitor includes one X capacitor 2.7 and two Y capacitors 2.6, and the second filter capacitor includes two Y capacitors 2.6; the capacitor ground aluminum strip is provided with two groups, specifically a first capacitor ground aluminum strip and a second capacitor ground aluminum strip, wherein the first capacitor ground aluminum strip includes one Y capacitor ground aluminum strip 2.5, and the second capacitor ground aluminum strip includes two Y capacitor ground aluminum strips 2.5.

[0075] As Figure 4As shown, the filter assembly 2 mainly comprises adjacent first and second filter parts, which are arranged adjacent to and electrically connected to each other.

[0076] The first filter part comprises a first positive copper bar, a first negative copper bar, a first insulating paper, a Y capacitor ground aluminum bar 2.5, an X capacitor 2.7, two Y capacitors 2.6, and a first filter inductor. The X capacitor 2.7 is connected to the first positive copper bar and the first negative copper bar, respectively. The first end of one Y capacitor 2.6 is connected to the first positive copper bar, and the first end of the other Y capacitor 2.6 is connected to the first negative copper bar. The other ends of the two Y capacitors 2.6 are connected in parallel to the Y capacitor ground aluminum bar 2.5, and the Y capacitor ground aluminum bar 2.5 is welded to the shell 1 for grounding.

[0077] The second filter part comprises a second positive copper bar, a second negative copper bar, a second insulating paper, two Y capacitors 2.6, two Y capacitor ground aluminum bars 2.5, and a second filter inductor. The first end of one Y capacitor 2.6 is connected to the second positive copper bar, and the other end is connected to the Y capacitor ground aluminum bar 2.5. The first end of the other Y capacitor 2.6 is connected to the second negative copper bar, and the other end is connected to the other Y capacitor ground aluminum bar 2.5. The two Y capacitor ground aluminum bars 2.5 are respectively welded to the shell 1 for grounding.

[0078] The first filter part and the second filter part are respectively hot-pressed together with the corresponding positive copper bar 2.3, negative copper bar 2.4, and insulating paper 2.2, and then the hot-pressed parts are inserted into the respective filter inductors 2.1. The insulating paper 2.2 serves as insulation protection between the positive and negative copper bars and between the positive and negative copper bars and the ground. The first filter part and the second filter part are welded together through the adapter copper bar 2.8 after assembly, thereby realizing electrical connection of the two filter inductors 2.1.

[0079] The two positive copper bars 2.3 are used to connect to the positive pole of the high-voltage DC bus of the new energy vehicle DC power port, and the two negative copper bars 2.4 are used to connect to the negative pole of the high-voltage DC bus of the new energy vehicle DC power port. After the high-voltage DC power is filtered by the inductor and capacitor, it is sent to the motor controller. The processed positive DC current is transmitted to the DC positive port of the motor controller, and the processed negative DC current is transmitted to the DC negative port of the motor controller.

[0080] Therefore, when the filter assembly 2 filters high-voltage DC power, it can perform two-stage filtering on the common-mode electromagnetic noise in the high-voltage DC bus through the filter inductor 2.1, and perform multi-stage filtering on the differential-mode and common-mode electromagnetic noise in the high-voltage DC bus through the X capacitor 2.7 and the Y capacitor 2.6, thereby forming a complete filter circuit and effectively suppressing the electromagnetic noise generated in the high-voltage DC power supply.

[0081] In the electric drive assembly of the new energy vehicle, the filter assembly 2 is a general design of the motor controller due to high power density. When the filter assembly 2 is assembled to the shell 1 of the motor controller, the heat dissipation, grounding and fixing mode are optimized, the filter assembly 2 is fixed in the shell 1 of the motor controller through epoxy resin, the Y capacitor grounding aluminum strip 2.5 is connected with the shell 1 in a manner of laser welding (the detailed view of the middle region G), the Y capacitor 2.6 grounding function is realized, and the liquid cooling channel is arranged on the side opposite to the filter assembly 2 in the shell 1. The Y capacitor grounding aluminum strip 2.5 is connected with the shell 1 of the motor controller in a manner of laser welding, the product volume is reduced, the material cost is saved, and the production rhythm is better. Figure 2

[0082] Therefore, the utility model designs the new type of Y capacitor 2.6 grounding mode for the fixing and grounding mode of the filter in the motor controller of the current new energy vehicle, effectively solves the problems of large space occupied by the traditional screw grounding and easy generation of debris, the filter assembly 2 is fixed by epoxy resin, which can not only reduce the product volume of the filter, but also is beneficial to the heat dissipation of the filter. When the filter works, the heat is conducted through the epoxy resin and transferred into the liquid cooling channel of the shell 1 of the motor controller, and the heat dissipation performance is better. The multifunctional design of water-cooling heat dissipation, welding grounding and epoxy resin fixing not only solves the problem of single function of the existing filter, but also can improve the wide application of the filter assembly 2 to market demand.

[0083] In the second aspect, the utility model provides an electric drive assembly, including a motor controller, the direct current port of the motor controller is connected with a filter device, and the filter device is the filter device provided in the first aspect of the utility model.

[0084] For the above-mentioned electric drive assembly embodiment, since it is basically similar to the filter device embodiment, the description is relatively simple, and the related parts refer to the part of the filter device embodiment.

[0085] It should be noted that each embodiment in the specification adopts a progressive manner for description, and each embodiment mainly explains the difference from other embodiments, and the same and similar parts of each embodiment can be referred to.

[0086] ​It also needs to be explained that in this paper, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, nor can it be understood as indicating or implying relative importance. Moreover, the term "includes" or any other variation thereof is intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device.

[0087] The above provides a kind of filter device and filter assembly provided in the application, carry out detailed introduction, the principle and implementation mode of the application are described in this paper by specific example, the above example is only for helping to understand the application, the content of the specification should not be understood as limiting the application. At the same time, for those skilled in the art, according to the application, there will be different forms of changes in specific implementation and application range, here need not and cannot exhaust all the implementation ways, and the obvious changes or changes derived therefrom are still within the protection scope of the application.

Claims

1. A filter device, characterized by The filter device comprises: a shell provided with a mounting groove, the shell being used for being assembled to an electric drive assembly; a filter assembly arranged in the mounting groove; wherein a grounding end in the filter assembly is provided with a welding area connected with the shell, the grounding end being welded to the shell through the welding area to realize grounding of the filter assembly.

2. A filter device according to claim 1, characterized in that An encapsulating member is encapsulated between the mounting groove and the filter assembly.

3. A filter device according to claim 2, characterised in that The encapsulating member is formed by curing of epoxy resin.

4. The filter device of claim 1, wherein, The shell is provided with a liquid cooling channel, the position of the liquid cooling channel corresponding to the position of the mounting groove.

5. A filter device according to claim 4, characterised in that The shell is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being respectively communicated with the liquid cooling channel.

6. The filter device of claim 4, wherein, The liquid cooling channel is located below a groove bottom wall of the mounting groove, and the outer edge contour of the liquid cooling channel matches the outer edge contour of the groove bottom wall.

7. The filter device of claim 1, wherein The grounding end is laser welded to the groove bottom wall of the mounting groove through the welding area.

8. The filter device of claim 1, wherein, The shell is formed by aluminum injection molding.

9. A filter device according to any one of claims 1-8, characterized in that The filter assembly comprises a capacitor grounding aluminum bar, and the grounding end is the capacitor grounding aluminum bar.

10. An electric drive assembly, comprising: The motor controller is connected with the filter device, and the filter device is the filter device according to any one of claims 1-9.

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