Flat wire motor stator and automobile

Abstract

The application discloses a flat wire motor stator and an automobile. The flat wire motor stator comprises a core, the core has a plurality of winding slots arranged at intervals in the circumferential direction, and the winding slots are used for accommodating conductors; a flat wire winding, the flat wire winding comprises flat wire conductors, the flat wire conductors are arranged in the winding slots and form end windings at axial end portions of the core, the flat wire winding comprises three-phase windings, each phase winding has a lead-out wire for electrical connection; and a busbar assembly, the busbar assembly comprises electrically-conductive connecting pieces, the electrically-conductive connecting pieces are arranged at axial end portions of the core and are welded to the lead-out wires, and are used for connecting the three-phase windings into a predetermined electrical connection form. The flat wire motor stator disclosed by the application can optimize the structure.

Description

Technical Field

[0001] This application relates to the automotive field, and more specifically, to a flat wire motor stator and an automobile having such a flat wire motor stator. Background Technology

[0002] A drive motor for new energy vehicles has a stator comprising an iron core, flat wire windings disposed within the winding slots of the iron core, and a busbar for electrically connecting the three-phase windings. The flat wire windings typically consist of multiple flat wire conductors that pass through the winding slots of the iron core, forming end windings at the axial ends of the iron core. The ends of the three-phase windings are connected to the busbar via leads to form star, delta, or other electrical connection configurations.

[0003] There is one wiring method for drive motors that uses a star connection. There is also another wiring method that uses a delta connection. For some drive motors, the connection relationship between the ends of the three-phase windings can be changed to switch between star and delta connection states, adapting to different speeds and load conditions.

[0004] There exists a new energy vehicle charging system that utilizes the drive motor windings as inductors in the charging circuit. For example, in the parking charging condition, some phase windings of the drive motor can be connected in series or parallel to serve as inductors for the boost charging circuit; in the driving driving condition, the three-phase windings are operated according to the connection method required by the drive motor.

[0005] In the above structure, the busbar and its welded connection to the winding leads are usually arranged at the axial end of the motor stator. For electric drive systems with limited axial space, the arrangement of the busbar, leads, and their welded connections will affect the axial dimensions of the motor stator. Therefore, a flat-wire motor stator structure is needed that can accommodate three-phase winding connections, axial space arrangement, and winding reuse as a charging and discharging inductor. Summary of the Invention

[0006] The main technical problem this application aims to solve is how to optimize the structure.

[0007] According to one aspect of this application, a flat wire motor stator is provided, the flat wire motor stator comprising: An iron core having a plurality of winding slots spaced apart circumferentially, the winding slots being used to accommodate conductors; A flat wire winding, the flat wire winding including a flat wire conductor, the flat wire conductor passing through the winding slot and forming an end winding at the axial end of the iron core, the flat wire winding including a three-phase winding, each phase winding having a lead for electrical connection; A busbar assembly, the busbar assembly including a conductive connector, the conductive connector being disposed at the axial end of the iron core and welded to the lead wire, for connecting the three-phase windings into a predetermined electrical connection form; The lead wire is formed by extending a portion of the flat wire winding, and the lead wire is located in the outermost conductor layer of the flat wire winding. The height of the welding connection point between the lead wire and the bus assembly in the axial direction of the iron core is not higher than the axial envelope height of the end winding.

[0008] An automobile according to one aspect of this application includes the aforementioned flat wire motor stator.

[0009] Through the above independent technical solution, the lead wire is formed by extending a part of the flat wire winding and is located in the outermost conductor layer of the flat wire winding, so that the lead wire can be connected to the busbar assembly on the outside of the winding; at the same time, the height of the welding connection point between the lead wire and the busbar assembly in the axial direction of the iron core is not higher than the axial envelope height of the end winding, so that the busbar assembly and the welding connection point do not increase the axial envelope height of the end winding, thereby helping to reduce the axial space occupied by the stator of the flat wire motor. Attached Figure Description

[0010] The disclosure of this application is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Wherein: Figure 1 The schematic diagram shows a single-ended angle-connected flat wire motor stator according to one embodiment of this application; Figure 2 Schematic representation Figure 1 A branch of the flat wire winding in the stator of a flat wire motor; Figure 3 The schematic diagram illustrates a single-path star-connected flat wire motor stator according to one embodiment of this application; Figure 4a Schematic representation Figure 1 A diagram showing the lead wire connection of the stator of a flat wire motor with a one-way angle connection. Figure 4b Schematic representation Figure 3 A diagram showing the lead wire connection of the stator of a flat wire motor connected to a star-shaped connection. Figure 5 The schematic diagram shows a three-branch angle-connected flat wire motor stator according to one embodiment of this application; Figure 6 The schematic diagram illustrates a three-branch star-connected flat wire motor stator according to one embodiment of this application; Figure 7 Schematic representation Figure 5 The three-branch flat wire windings of the stator of the flat wire motor in the middle; Figure 8a Schematic representation Figure 5 Diagram showing the lead wire connection of the stator of a three-branch angle-connected flat wire motor. Figure 8b Schematic representation Figure 6 Diagram showing the lead wire connection of the stator of a three-branch star-connected flat wire motor. Figure 9a The schematic diagram shows the connection of the three-phase windings of a branch-angle flat wire motor stator as an inductor in a charging and discharging circuit according to one embodiment of this application. Figure 9b The schematic diagram shows the connection of the three-phase windings of a single-path star-connected flat wire motor stator as an inductor in a charging and discharging circuit according to one embodiment of this application. Figure 10a The schematic diagram shows a branch angle-connected flat wire motor stator that serves as the inductor for the charging and discharging circuit. Figure 10b The schematic diagram shows a star-connected flat wire motor stator that serves as an inductor in the charging and discharging circuit. Detailed Implementation

[0011] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of this application.

[0012] refer to Figure 1 As shown, the stator of the flat wire motor includes a core 1, flat wire windings 2, and a busbar assembly. The core 1 has multiple winding slots spaced circumferentially for accommodating conductors. The flat wire windings 2 include flat wire conductors that pass through the winding slots and form end windings at the axial ends of the core 1. The flat wire windings 2 include three-phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Each phase winding has leads for electrical connection.

[0013] The iron core 1 can have 72 winding slots, which are evenly distributed around the circumference of the iron core 1. The flat wire winding 2 can be a 6-layer flat wire winding, with the 6 layers of conductors arranged radially from the inside to the outside, forming layers 1 to 6, and layer 6 being the outermost conductor layer of the flat wire winding 2. The leads of the three-phase windings are formed by extending a portion of the flat wire winding 2 and are arranged on the outermost conductor layer. Thus, the leads can be connected to the busbar assembly on the outside of the flat wire winding 2.

[0014] The busbar assembly includes conductive connectors disposed at the axial end of the iron core 1 and welded to the leads. The conductive connectors can be copper busbars, copper sheets, or other metal conductive components capable of carrying current. The conductive connectors are used to connect the U-phase winding, V-phase winding, and W-phase winding into a predetermined electrical connection configuration. The predetermined electrical connection configuration can be a delta connection structure, a star connection structure, or a connection structure capable of switching between a star connection state and a delta connection state.

[0015] The axial envelope height of the end winding refers to the maximum axial height of the end winding relative to the corresponding axial end face of the core 1. The height of the welded connection point between the lead wire and the busbar assembly in the axial direction of the core 1 not exceeding the axial envelope height of the end winding means that the welded connection point is located within the axial envelope range of the end winding, or is flush with the axial envelope height of the end winding, but does not exceed the maximum height of the end winding in the axial direction.

[0016] The height of the welding connection point between the lead wire and the busbar assembly can be lower than or equal to the axial height of other parts of the end winding, so that the busbar assembly and welding connection point do not additionally increase the axial height of the flat wire motor stator.

[0017] The lead wire is formed by extending a portion of the flat wire winding 2 and is located in the outermost conductor layer, which facilitates welding connection with the busbar assembly; the welding connection point is not higher than the axial envelope height of the end winding, which helps to reduce the axial space occupation of the flat wire motor stator.

[0018] refer to Figure 2 and Figure 4a As shown, according to one embodiment, the flat wire winding 2 is a single-phase winding. The U-phase winding has a U-phase start lead and a U-phase end lead, the V-phase winding has a V-phase start lead and a V-phase end lead, and the W-phase winding has a W-phase start lead and a W-phase end lead. Thus, the single-phase flat wire winding has six leads 6-11.

[0019] In the stator of a 72-slot, 6-layer flat wire motor, all six leads 6-11 are located on the 6th layer. Specifically, the six leads 6-11 can be placed in 37&6 U1, 48&6 U2, 45&6 V1, 34&6 V2, 31&6 W1, and 42&6 W2, respectively. Here, U1 represents the U-phase start lead, U2 represents the U-phase end lead, V1 represents the V-phase start lead, V2 represents the V-phase end lead, W1 represents the W-phase start lead, and W2 represents the W-phase end lead. That is, the U-phase lead-in U1 can be located in slot 37, layer 6, and the U-phase tail lead-in U2 can be located in slot 48, layer 6; the V-phase lead-in V1 can be located in slot 45, layer 6, and the V-phase tail lead-in V2 can be located in slot 34, layer 6; the W-phase lead-in W1 can be located in slot 31, layer 6, and the W-phase tail lead-in W2 can be located in slot 42, layer 6. The above slot layer positions are only one example; other slot layer positions that allow the six leads 6-11 to be located in the outermost conductor layer can also be used.

[0020] The six leads 6-11 are welded to the busbar assembly. Welding methods can include laser welding, resistance welding, brazing, or other methods capable of achieving electrical and mechanical connections between the flat conductors and conductive connectors. Before welding, the ends of the leads and the welding areas of the conductive connectors can be cleaned, shaped, and positioned to ensure adequate contact area and connection stability.

[0021] All six leads 6-11 of the single-phase flat wire winding are located in the outermost conductor layer, which concentrates the six ends of the three-phase winding in a position that is easy to connect. This is conducive to forming star connection, delta connection or external switching connection, and reduces the axial occupation of the end connection structure.

[0022] refer to Figure 5 , Figure 7 and Figure 8a As shown, the flat wire winding 2 is a three-branch winding. Each phase winding includes three branches, and each branch has a start lead and a finish lead. Thus, the three-phase winding forms a total of 18 branch leads. In this embodiment, U1+, U2+, and U3+ represent the branch head leads of the first, second, and third branches of phase U, respectively; U1-, U2-, and U3- represent the branch tail leads of the first, second, and third branches of phase U, respectively; V1+, V2+, and V3+ represent the branch head leads of the first, second, and third branches of phase V, respectively; V1-, V2-, and V3- represent the branch tail leads of the first, second, and third branches of phase V, respectively; W1+, W2+, and W3+ represent the branch head leads of the first, second, and third branches of phase W, respectively; W1-, W2-, and W3- represent the branch tail leads of the first, second, and third branches of phase W, respectively.

[0023] In the stator of a 72-slot, 6-layer flat wire motor, the leads of the three branches of the U phase can be placed at 37&6 U1+, 46&6 U1-, 38&6 U2+, 47&6 U2-, 39&6 U3+, and 48&6 U3- respectively; the leads of the three branches of the V phase can be placed at 43&6 V1+, 34&6 V1-, 44&6 V2+, 35&6 V2-, 45&6 V3+, and 36&6 V3- respectively; and the leads of the three branches of the W phase can be placed at 31&6 W1+, 40&6 W1-, 32&6 W2+, 41&6 W2-, 33&6 W3+, and 42&6 W3- respectively. That is, the lead wires of the three branches of the U phase can be located in the 6th layer of slot 37, slot 46, slot 38, slot 47, slot 39, and slot 48, respectively; the lead wires of the three branches of the V phase can be located in the 6th layer of slot 43, slot 34, slot 44, slot 35, slot 45, and slot 36, respectively; and the lead wires of the three branches of the W phase can be located in the 6th layer of slot 31, slot 40, slot 32, slot 41, slot 33, and slot 42, respectively.

[0024] All 18 branch leads are located on the outermost conductor layer of the flat wire winding 2 and are welded to the busbar assembly. The busbar assembly can connect the same-phase branches according to the motor connection method, or connect the corresponding branches into the required star connection structure, delta connection structure, or other electrical connection methods.

[0025] In the three-branch implementation, each branch can be designed with the same or similar conductor length, resistance, and inductance to reduce the current difference between branches when operating in parallel. The ends of each branch can be connected at the axial end of the core 1 via a busbar assembly, or they can be led out separately and reconfigured by an external connection structure.

[0026] The three-branch winding improves the connection flexibility of the three-phase winding and ensures that each branch lead is on the outermost conductor layer, which facilitates low axial height connection of the busbar assembly.

[0027] refer to Figure 4a and Figure 8a As shown, the bus assembly includes three conductive connectors. These three conductive connectors can be formed by bus 3, bus 4, and bus 5, respectively. The three conductive connectors are welded to the leads of different phase windings, so that the U-phase winding, V-phase winding, and W-phase winding are connected end-to-end in a delta connection structure.

[0028] In one-phase implementation, the U-phase winding, V-phase winding, and W-phase winding each have a start end and a finish end. Three conductive connectors can connect the corresponding ends of different phase windings, forming a delta-closed connection between the three phase windings. Specifically, the start-end connection relationship between the U-phase, V-phase, and W-phase can be determined based on the winding phase sequence and the motor rotation direction.

[0029] In the three-branch implementation, the three branches of the same phase can first be made into phase winding ends, and then the U-phase, V-phase, and W-phase can be connected end-to-end through three conductive connectors; alternatively, the corresponding branches can be connected in a delta configuration through busbar assemblies. For the three-branch connection method, the busbar assembly can be set as a grouped conductive connector, so that the total end of each corresponding branch or each phase after being connected is welded together according to the delta connection relationship.

[0030] The three-phase windings can be connected in a delta configuration using three conductive connectors; at the same time, the three conductive connectors are welded to the lead wires of the outermost conductor layer, which helps to control the axial height of the busbar assembly.

[0031] refer to Figure 3 , Figure 4b , Figure 6 and Figure 8b As shown, the busbar assembly includes a neutral point conductive connector. The neutral point conductive connector is welded to one end of the three-phase winding to form a neutral point; the other end of the three-phase winding is connected to the busbar assembly to form a star connection structure.

[0032] X, Y, and Z represent the phase terminals or neutral point connection positions of the three-phase windings, respectively. Z1 and Z2 represent the bifurcation connection points where the two leads of the corresponding phase windings converge into the busbar assembly, respectively. T represents the circuit access point when the motor winding is used as a step-up inductor.

[0033] In one implementation, the neutral point conductive connector can weld one end of the U-phase winding, one end of the V-phase winding, and one end of the W-phase winding together. The other ends of the U-phase winding, V-phase winding, and W-phase winding are respectively connected to the busbar assembly as three-phase terminals. Depending on the winding design requirements, the opposite ends of the three-phase windings can also be welded together to form the neutral point, while the other end serves as a three-phase terminal.

[0034] In the three-branch implementation, the neutral point conductive connector can connect the corresponding ends of the three-phase windings to form a neutral point. For example, the three branches of each phase can first be connected within the same phase, and then the corresponding ends of the three phases can be connected together by the neutral point conductive connector; alternatively, multiple connection positions can be used to form a neutral point connection between the corresponding ends of each branch.

[0035] The neutral point conductive connector can form a star connection structure, making the flat wire motor stator suitable for star connection; at the same time, the neutral point connection position is arranged corresponding to the lead wire of the outermost conductor layer, which can reduce the axial space occupation of the bus structure required for star connection.

[0036] refer to Figure 4a and Figure 9a As shown, in a single-phase flat wire winding, the busbar assembly includes six phase-end conductive connectors. These six phase-end conductive connectors are welded to the start and end leads of the U-phase, V-phase, and W-phase windings, respectively. These six phase-end conductive connectors are used to connect to an external switching assembly, enabling the three-phase windings to switch between star and delta connection states.

[0037] Specifically, the six phase-end conductive connectors correspond to the U-phase start end, U-phase end, V-phase start end, V-phase end, W-phase start end, and W-phase end, respectively. Each phase-end conductive connector is welded to its corresponding lead, forming a connection terminal that can be electrically connected to an external switching assembly. The external switching assembly changes the electrical connection relationship between the six phase-end conductive connectors to form a star connection structure or a delta connection structure for the three-phase windings.

[0038] In a star connection, the external switching assembly can connect one end of the U-phase, V-phase, and W-phase together to form a neutral point, and use the other end of the three-phase winding as the three-phase terminal. In a delta connection, the external switching assembly can connect the beginning and end of the U-phase, V-phase, and W-phase sequentially to form a delta closed connection structure.

[0039] External switching assemblies can consist of contactors, relays, semiconductor switches, or combinations thereof. External switching assemblies can be equipped with interlocking structures to prevent simultaneous star and delta connections from causing phase-to-phase short circuits. External switching assemblies can perform connection state switching when the motor stops, when current is low, or when control conditions are met.

[0040] The six-phase conductive connectors can independently lead out the six ends of the three-phase winding, allowing the external switching assembly to form a star connection or a delta connection as needed. At the same time, the six-phase conductive connectors are connected to the lead wires of the outermost conductor layer, which can control the axial height of the stator ends.

[0041] refer to Figure 9a , Figure 9b , Figure 10a and Figure 10b As shown, the external switching assembly is configured to selectively connect the six phase-end conductive connectors under charging and discharging conditions, so that one phase winding is connected to the charging and discharging circuit alone, or two or three phase windings are connected in series and / or in parallel and then connected to the charging and discharging circuit to form the inductance of the charging and discharging circuit.

[0042] In one example, the external switching assembly can connect the start and end leads of the U-phase winding to the charging and discharging circuit separately, allowing the U-phase winding to function as an inductor in the charging and discharging circuit independently. Similarly, the V-phase winding or the W-phase winding can also be connected to the charging and discharging circuit independently. The external switching assembly can be selected from options such as connecting a single phase winding, connecting two phase windings in series, connecting two phase windings in parallel, connecting three phase windings in series, connecting three phase windings in parallel, or connecting three phase windings in a series-parallel combination, depending on the charging power and charging ripple current requirements.

[0043] In one example, the external switching assembly can connect the U-phase winding and the V-phase winding in series, with the series winding serving as the inductor in the boost charging circuit. In another example, the external switching assembly can connect two or three phases of the U-phase, V-phase, and W-phase windings in parallel as needed to improve the current carrying capacity under charging and discharging conditions. In yet another example, the external switching assembly can connect some phase windings in series and then in parallel with another portion of the phase windings to obtain the required equivalent inductance and equivalent resistance.

[0044] Charging and discharging conditions can include a parking charging condition. In this condition, the stator of the flat-wire motor is not used to output driving force; the stator windings form inductors through an external switching assembly and are connected to the charging and discharging circuit. In the driving condition, the external switching assembly can restore the three-phase windings to the star or delta connection state required for the drive motor.

[0045] During charging and discharging, the switching state of the external switching components may result in an imbalance of the three-phase current, making it impossible to generate the three-phase symmetrical rotating magnetic field required for the normal rotation of the drive motor. Alternatively, by controlling the connection method of the windings or the direction of the current, some of the magnetic field effects can be canceled out, thereby reducing the possibility of generating driving torque during charging and discharging. During charging and discharging, the vehicle's existing parking mechanism or braking control strategy can also be combined to reduce or avoid unintended vehicle movement.

[0046] The three-phase winding can be used as a drive motor winding under driving conditions, and can form the inductance of the charging and discharging circuit through series and / or parallel connection under charging and discharging conditions, thereby reducing the need for separate inductor components.

[0047] The busbar assembly may also include an insulating structure. The insulating structure is disposed on the outside of at least a portion of the conductive connectors to improve the insulation performance and structural strength of the busbar assembly. The conductive connectors may be copper busbars or other conductive metal components, and the insulating structure may cover the outer peripheral surface of the conductive connectors, with pre-reserved welding areas at locations where welding is required.

[0048] The insulating structure may include heat-shrink tubing. The heat-shrink tubing is fitted over the outside of the conductive connector and shrinks to adhere to the surface of the conductive connector by heat. The insulating structure may also include an injection-molded insulating layer. The injection-molded insulating layer is formed on the outside of the conductive connector through an injection molding process, making the conductive connector and the insulating material an integral structure. The injection-molded insulating layer may cover the main body of the conductive connector and form openings or exposed areas at the locations where it will be soldered to the leads.

[0049] Heat shrink tubing or injection-molded insulation can improve the insulation performance and structural strength of busbar assemblies, which helps to ensure the connection reliability of the three-phase winding connection structure under high voltage, vibration and thermal cycling environments.

[0050] After the flat wire winding 2 is assembled to the iron core 1, the ends of the flat wire conductors that need to form leads are shaped at the axial ends of the iron core 1 so that they extend to the corresponding positions of the outermost conductor layer. The ends of the leads can be bent, cut, stripped of paint, and positioned to form connection ends suitable for welding.

[0051] The conductive connectors of the busbar assembly can be pre-formed. The conductive connectors can extend circumferentially along the core 1, or they can be configured as arc-shaped, bent, or sheet-like structures depending on the lead-out position. After the conductive connectors are installed to the axial end of the core 1, they are welded to the corresponding lead-out.

[0052] The position of the welded connection point can be controlled by tooling positioning to ensure that the height of the welded connection point in the axial direction of the core 1 is not higher than the axial envelope height of the end winding. The axial distance between the highest point of the end winding and the welded connection point can be used to confirm that the welded connection point does not exceed the axial envelope height of the end winding.

[0053] After welding is completed, an insulation structure can be installed on the busbar assembly. The insulation structure can be pre-set and the welding area reserved before welding, or it can be installed after welding is completed. When using heat shrink tubing, the heat shrink tubing can be placed on the outside of the conductive connector and heated to shrink; when using injection-molded insulation, the conductive connector can be placed in the mold and then injection-molded.

[0054] By positioning and welding the leads and conductive connectors, and controlling the height of the welding connection points, a stable low axial height busbar connection can be achieved. Improving the insulation performance and structural strength of the busbar assembly through the insulation structure is beneficial to enhancing the assembly reliability of the flat wire motor stator.

[0055] This application also includes an automobile with a flat wire motor stator of any one or more of the foregoing embodiments, the technical features and effects of which correspond to the foregoing description, and therefore will not be repeated here.

[0056] Flat-wire motor stators can be used as drive motor stators in automotive electric drive systems. The drive motor can work with the vehicle's energy storage device, motor controller, and transmission system to output driving force when the vehicle is in motion. During driving conditions, the three-phase windings of the flat-wire motor stator can be connected in a star or delta configuration using busbar assemblies. During charging and discharging conditions, the three-phase windings can be connected in series and / or in parallel using external switching assemblies to serve as inductors in the charging and discharging circuit.

Claims

1. A flat wire motor stator, characterized in that, The flat wire motor stator includes: An iron core having a plurality of winding slots spaced apart circumferentially, the winding slots being used to accommodate conductors; A flat wire winding, the flat wire winding including a flat wire conductor, the flat wire conductor passing through the winding slot and forming an end winding at the axial end of the iron core, the flat wire winding including a three-phase winding, each phase winding having a lead for electrical connection; A busbar assembly, the busbar assembly including a conductive connector, the conductive connector being disposed at the axial end of the iron core and welded to the lead wire, for connecting the three-phase windings into a predetermined electrical connection form; The lead wire is formed by extending a portion of the flat wire winding, and the lead wire is located in the outermost conductor layer of the flat wire winding. The height of the welding connection point between the lead wire and the bus assembly in the axial direction of the iron core is not higher than the axial envelope height of the end winding.

2. The flat wire motor stator according to claim 1, characterized in that, The flat wire winding is a branch winding. The three-phase windings include a U-phase winding, a V-phase winding, and a W-phase winding. The U-phase winding has a U-phase start lead and a U-phase end lead. The V-phase winding has a V-phase start lead and a V-phase end lead. The W-phase winding has a W-phase start lead and a W-phase end lead. All six leads are located on the outermost conductor layer of the flat wire winding and are welded to the busbar assembly.

3. The flat wire motor stator according to claim 1, characterized in that, The flat wire winding is a three-branch winding, with each phase winding including three branches. Each branch has a branch start lead and a branch end lead. The branch start lead and the branch end lead are both located in the outermost conductor layer of the flat wire winding and are respectively welded to the busbar assembly.

4. The flat wire motor stator according to claim 1, characterized in that, The busbar assembly includes three conductive connectors, which are respectively welded to the leads of different phase windings, so that the U-phase winding, the V-phase winding, and the W-phase winding are connected end to end in a triangular connection structure.

5. The flat wire motor stator according to claim 1, characterized in that, The busbar assembly includes a neutral point conductive connector, which is welded to one end of the three-phase winding to form a neutral point. The other end of the three-phase winding is connected to the busbar assembly to form a star connection structure.

6. The flat wire motor stator according to claim 2, characterized in that, The bus assembly includes six phase-end conductive connectors, which are respectively welded to the first and last leads of the U-phase winding, the V-phase winding, and the W-phase winding. The six phase-end conductive connectors are used to connect to an external switching assembly so that the three-phase windings can switch between a star connection state and a delta connection state.

7. The flat wire motor stator according to claim 6, characterized in that, The external switch assembly is configured to selectively connect the six phase-end conductive connectors under charging and discharging conditions, so that one phase winding is connected to the charging and discharging circuit alone, or two or three phase windings are connected in series and / or in parallel and then connected to the charging and discharging circuit to form the inductance of the charging and discharging circuit.

8. The flat wire motor stator according to claim 1, characterized in that, The bus assembly further includes an insulating structure disposed on the outside of at least a portion of the conductive connectors to improve the insulation performance and structural strength of the bus assembly.

9. The flat wire motor stator according to claim 8, characterized in that, The insulation structure includes a heat-shrink tubing or an injection-molded insulation layer, which is disposed on the outside of the conductive connector to improve the insulation performance and structural strength of the bus assembly.

10. A car, characterized in that, It comprises a flat wire motor stator according to any one of claims 1 to 9.

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