WO2022156502A1

WO2022156502A1 - Dual-motor inverter and automobile

Info

Publication number: WO2022156502A1
Application number: PCT/CN2021/142859
Authority: WO
Inventors: 赵慧超; 刘晓录; 邓洋; 徐德才; 王宏宝; 高一; 黄荣华; 刘璇; 朱占山; 苏瑞涛
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-01-25
Filing date: 2021-12-30
Publication date: 2022-07-28
Also published as: CN112953348A; CN112953348B

Abstract

Disclosed in the present application are a dual-motor inverter and an automobile. The dual-motor inverter comprises: a box body; a first power module and a second power module, which are installed side by side on the box body; a DC bus capacitor, which is located at the bottom end of the second power module; a first DC terminal block and a second DC terminal block, wherein the first DC terminal block is arranged on a DC side of the first power module, and the second DC terminal block is arranged on a DC side of the second power module; a DC connector and an AC connector, which are both arranged on the outer periphery of the box body; an electromagnetic filter, which is mounted on the box body; a first AC terminal block and a second AC terminal block, wherein the first AC terminal block is arranged on an AC side of the first power module, and the second AC terminal block is arranged on an AC side of the second power module; and a first drive board and a second drive board, which are each connected to the box body by means of two grounding busbars, and are each provided with a discharge resistor.

Description

Dual Motor Inverter & Automotive

This application claims the priority of a Chinese patent application with application number 202110097508.8 filed with the China Patent Office on January 25, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of automobiles, for example, to a dual-motor inverter and an automobile.

Background technique

Due to the shortcomings of pure electric vehicles such as long charging time, short cruising range and inconvenient charging, hybrid vehicles have become a hot spot for many large car companies and related institutions to develop. As one of the key components of hybrid electric vehicles, the motor inverter needs to meet higher requirements, that is, it needs to meet the requirements of smaller installation space, higher ambient temperature and higher vibration level.

However, the motor inverter of a hybrid electric vehicle is large in size and low in integration, which is not conducive to the layout of the whole vehicle; and the filter design in the motor inverter is unreasonable, resulting in poor electromagnetic compatibility performance of the motor inverter.

SUMMARY OF THE INVENTION

The present application proposes a dual-motor inverter, which has a compact structure, a high degree of integration and good electromagnetic compatibility.

The present application proposes an automobile, which includes a dual-motor inverter with the characteristics of compact structure, high integration and good electromagnetic compatibility.

The present application adopts the following technical solutions.

A dual-motor inverter, comprising: a box body on which a retaining wall structure is arranged; a first power module and a second power module, the first power module and the second power module are installed side by side in the box body; a DC bus capacitor, which is installed on the box, and the DC bus capacitor is located at the bottom of the second power module; a first DC connection seat and a second DC connection seat, the first DC connection seat The DC connection base is arranged on the DC side of the first power module, the first DC connection base is arranged to connect the DC bus capacitor and the first power module, and the second DC connection base is arranged at the The DC side of the second power module, the second DC terminal block is arranged to connect the DC bus capacitor and the second power module; the DC connector and the AC connector are both arranged on the outer periphery of the box body, and the DC connector and the first power module are respectively located on the first side and the second side of the retaining wall structure; an electromagnetic filter is installed on the box, and the electromagnetic filter is set to connect the DC connector and the first DC connection seat; the first AC connection seat and the second AC connection seat, the first AC connection seat is arranged on the AC side of the first power module, the first AC connection seat The AC wiring socket is arranged to connect the AC busbar of the driving motor of the vehicle and the first power module, so that the first AC wiring socket is connected with the AC busbar of the driving motor, and the second AC wiring socket is provided with On the AC side of the second power module, the second AC wiring socket is configured to connect the AC connector and the second power module; a first drive board and a second drive board, the first drive board is arranged on the first power module, the second driving board is arranged on the second power module, and both the first driving board and the second driving board are connected to the The box is connected, and a plurality of discharge resistors are arranged on the first driving board and the second driving board.

The dual-motor inverter further includes: an upper cover, which is arranged on the top of the box body; a control board, which is arranged on the top of the upper cover, the control board is connected with the first driving board and the The second driving board is electrically connected, and the control board and the first driving board are connected through a board-to-board connector.

The first DC terminal block and the second DC terminal block are respectively disposed on the DC side of the first power module and the DC side of the second power module through an insert injection molding process.

The structure of the first DC terminal block is a laminated busbar structure.

The bottom of the box is provided with cooling water channels in series, which are configured to cool the first power module and the second power module.

The cooling water channel includes: a first power module water channel, which is configured to cool the first power module; a second power module water channel, which is configured to cool the second power module, and the second power module water channel is connected to the second power module water channel. The heat-dissipating aluminum plates of the DC bus capacitor are coated with thermally conductive glue, which is set to cool the DC bus capacitor; the water channel of the main box body is set to connect the water channel of the first power module and the water channel of the second power module in series, so The water channel of the main box body includes two cylindrical water channels and a semi-cylindrical water channel, the two cylindrical water channels and the semi-cylindrical water channel are formed by die casting, and the water channel of the main box body and the first power The module water channel and the water channel of the second power module are sealed by an O-shaped sealing ring, and the back of the semi-cylindrical water channel is sealed by the water channel sealing cover and the water channel sealing ring.

The first AC wiring seat and the second AC wiring seat are respectively disposed on the AC side of the first power module and the AC side of the second power module through an insert injection molding process.

The dual-motor inverter further includes: a current sensor, the current sensor is provided on both the AC side of the first power module and the AC side of the second power module, and the control board is connected to the current sensor. electrical connection.

The dual-motor inverter further includes: a wire harness fixing seat, which is configured to fix the wire harness in the dual-motor inverter.

An automobile includes a driving motor, a generator, and the above-mentioned dual-motor inverter, wherein the dual-motor inverter is arranged between the driving motor and the generator.

Description of drawings

FIG. 1 is a top view of the dual-motor inverter provided by the present application (with the upper cover and the top cover removed);

FIG. 2 is a partial exploded schematic diagram of the dual-motor inverter provided by the present application;

3 is a schematic structural diagram of a cooling water channel provided by the present application;

4 is a rear view of the dual-motor inverter provided by the present application;

5 is a schematic structural diagram of the main tank body water channel provided by the present application;

6 is a front view of the AC busbar of the drive motor provided by the present application;

FIG. 7 is a top view of the discharge resistor provided by the present application.

Description of reference numbers:

1-box body; 2-DC bus capacitor; 3-first power module; 4-second power module; 5-first drive board; 6-second drive board; 7-first DC terminal block; 8- The second DC terminal block; 9-the first AC terminal block; 10-the second AC terminal block; 11-current sensor; 12-electromagnetic filter; 13-the first grounding busbar; 14-the second grounding busbar; 15 -AC connector; 16-DC connector; 17-water inlet pipe; 18-water outlet pipe; 19-upper cover; 20-control board; 21-top cover; 22-first power module water channel; 23-second power module water channel; 24-main box water channel; 241-cylindrical water channel; 242-semi-cylindrical water channel; 25-water channel sealing cover; 26-water channel sealing ring; 27-low pressure connector; 28-retaining wall structure; 29-drive motor The AC busbar; 30-discharge resistance.

Detailed ways

The technical solutions of the present application will be described below with reference to the accompanying drawings and through specific embodiments.

In this embodiment, a dual-motor inverter and a vehicle including the dual-motor inverter are proposed. The vehicle further includes two motors, a driving motor and a generator; the entire dual-motor inverter is arranged between the driving motor and the generator. In the space between the two-motor inverters, the structure of the entire dual-motor inverter can be relatively compact, the integration degree is high, and the electromagnetic compatibility performance is good. The vehicle in this embodiment is a hybrid vehicle.

As shown in FIG. 1 , the dual-motor inverter includes a box body 1, a first power module 3 and a second power module 4, a DC bus capacitor 2, a first DC terminal block 7 and a second DC terminal block 8, and a DC connection 16 and the AC connector 15 , the electromagnetic filter 12 , the first AC wiring socket 9 and the second AC wiring socket 10 , the first driving board 5 and the second driving board 6 . A retaining wall structure 28 is arranged on the box body 1; the first power module 3 and the second power module 4 are installed side by side on the box body 1; the DC bus capacitor 2 is installed on the box body 1, and the DC bus capacitor 2 is located in the second The bottom end of the power module 4; the first DC connection seat 7 is arranged on the DC side of the first power module 3, the first DC connection seat 7 is arranged to connect the DC bus capacitor 2 and the first power module 3, and the second DC connection The seat 8 is arranged on the DC side of the second power module 4, and is arranged to connect the DC bus capacitor 2 and the second power module 4 through the second DC connection seat 8; On the outer circumference, the DC connector 16 and the first power module 3 are respectively located on the first side and the second side of the retaining wall structure 28, and the DC connector 16 and the AC connector 15 are both high-voltage connectors; the electromagnetic filter 12 is installed on the On the box body 1, the electromagnetic filter 12 is arranged on the high-voltage DC end of the dual-motor inverter, so as to connect the DC connector 16 with the first DC terminal block 7; the first AC terminal block 9 is arranged on the first power module. On the AC side of The wiring seat 10 is arranged on the AC side of the second power module 4, and the second AC wiring seat 10 is arranged to connect the AC connector 15 and the second power module 4; the first driving board 5 is arranged on the first power module 3, and the second The driving board 6 is arranged on the second power module 4, and the first driving board 5 and the second driving board 6 are connected to the box 1 through two grounding bus bars, and the first driving board 5 and the second driving board 6 are both connected to the box 1. A plurality of discharge resistors 30 are integrally provided.

By installing the first power module 3 and the second power module 4 on the box 1 side by side, and placing the DC bus capacitor 2 at the bottom end of the second power module 4, the entire DC bus capacitor 2 can be located just at the drive motor and power generation. The recessed area between the two motors of the machine greatly saves space and can make the arrangement more convenient and compact; and multiple discharge resistors 30 are integrated on the first drive board 5 and the second drive board 6, reducing the number of parts , the assembly time is saved, and the structure is further made more compact; the first AC terminal block 9 is arranged on the AC side of the first power module 3, so that the AC busbar extending from the first AC terminal block 9 is directly connected to the AC side of the driving motor. The busbar 29 is connected, and there is no need to provide additional AC high voltage connectors, which reduces the production cost and saves the layout space of the entire vehicle, further making the structure more compact, so that the entire dual-motor inverter has a high degree of integration. In this embodiment, the first power module 3 and the second power module 4 are installed side by side on the box body 1 at a 90° angle. In other embodiments, the first power module 3 and the second power module 4 may be installed side by side on the box body 1 at 180°.

At the same time, by disposing the electromagnetic filter 12 on the box body 1, and separating the first power module 3 and the DC connector 16 into two areas by the blocking wall structure 28 on the box body 1, it is possible to prevent the first power module 3 from crossing the The electromagnetic interference of the electromagnetic filter 12 to the DC connector 16 improves the electromagnetic compatibility performance of the dual-motor inverter; and the first driving board 5 and the second driving board 6 pass through the two grounding bus bars and the box 1 connection, the first driving board 5 and the second driving board 6 can be fully grounded, which further makes the electromagnetic compatibility of the dual-motor inverter better. As shown in FIG. 1 , the two grounding busbars are a first grounding busbar 13 and a second grounding busbar 14 respectively. The first grounding busbar 13 and the second grounding busbar 14 are both disposed on the box body 1 .

As shown in FIG. 1 and FIG. 2 , the dual-motor inverter further includes an upper cover 19 , a control board 20 and a top cover 21 . The upper cover 19 is arranged on the top of the box body 1; the control board 20 is arranged on the top of the upper cover 19, the control board 20 is electrically connected with the first driving board 5 and the second driving board 6, and the control board 20 is connected with the first driving board 5 Connected by board-to-board connectors; the top cover 21 is arranged on the top of the upper cover 19 and the control board 20, and is arranged to protect the entire dual-motor inverter. The control board 20 is directly fixed on the top of the upper cover 19, so that the assembly of the control board 20 can be more stable, and the control board 20 can be directly fixed on the die-casting shell, so as to improve the anti-vibration performance of the dual-motor inverter, so that it can be The whole dual-motor inverter is better adapted to the characteristics of the strong vibration level of the hybrid vehicle, so that its working reliability is high.

By directly connecting the control board 20 and the first driving board 5 through board-to-board connectors, it is no longer necessary to set up additional connecting cables, and the Y capacitor and the DC bus capacitor are directly integrated, further making the structure more compact, saving production costs and Installation space, so that the integration of the entire dual-motor inverter is high; and the control board 20 is located at the top of the upper cover 19, so that the control board 20 and other high-voltage components in the dual-motor inverter are placed on the upper and lower sides respectively. In the two accommodating cavities, the electromagnetic interference of the high-voltage components to the control board 20 can be reduced, so that the electromagnetic compatibility of the entire dual-motor inverter can be better. The control board 20 is a common control structure of inverters in the related art, therefore, the structure and working principle of the control board 20 will not be repeated here. In this embodiment, the board-to-board connector adopts an anti-vibration type connector with better anti-vibration performance, so as to further improve the anti-vibration performance of the dual-motor inverter.

As shown in FIG. 2 , the dual-motor inverter further includes a low-voltage connector 27 . The low-voltage connector 27 is arranged on the upper cover 19 so that the low-voltage connector 27 can be located in the cavity between the upper cover 19 and the top cover 21 . , so as to avoid electromagnetic interference from other high-voltage components in the dual-motor inverter, so that the electromagnetic compatibility of the entire dual-motor inverter can be better.

The first DC terminal block 7 and the second DC terminal block 8 are respectively disposed on the DC side of the first power module 3 and the DC side of the second power module 4 through the insert injection molding process; the first AC terminal block 9 and the second power module 4 The AC terminal blocks 10 are respectively disposed on the AC side of the first power module 3 and the AC side of the second power module 4 through the insert injection molding process; and the first DC terminal block 7, the second DC terminal block 8, the first AC terminal Both the terminal block 9 and the second AC terminal block 10 are provided with a positioning structure, so that the first DC terminal block 7, the second DC terminal block 8, the first AC terminal block 9 and the second AC terminal block 10 can be assembled easily , so that the assembly is better, and the assembly space can be saved at the same time, so that the compactness of the whole structure is better. In other embodiments, the first DC wiring socket 7 , the second DC wiring socket 8 , the first AC wiring socket 9 and the second AC wiring socket 10 may also be fixed in a split pre-assembled fixing method or other fixing methods. assembly.

The structure of the first DC terminal block 7 is a laminated busbar structure. The laminated busbar structure refers to a laminated structure with at least three layers formed by alternately stacking the positive busbar and the negative busbar in the first DC terminal block 7, thereby effectively reducing the parasitic inductance and improving the dual-motor inverter. performance of the inverter to avoid damage to the core components of the dual-motor inverter, so as to better protect the dual-motor inverter.

A series-connected cooling water channel is arranged at the bottom of the box body 1 to cool the first power module 3 and the second power module 4, so as to ensure the heat dissipation capability of the first power module 3 and the second power module 4; The structure of the dual-motor inverter is relatively simple, which is beneficial to the overall layout. In other embodiments, other cooling forms may also be used.

As shown in FIGS. 3-5 , a water inlet pipe 17 and a water outlet pipe 18 are respectively provided on the opposite first side and the second side of the box body 1 ; and the cooling water channel includes a first power configured to cool the first power module 3 . The module water channel 22 and the second power module water channel 23 arranged to cool the second power module 4 . A thermally conductive adhesive is coated between the second power module water channel 23 and the heat dissipation aluminum plate of the DC bus capacitor 2 to cool the DC bus capacitor 2; the DC bus capacitor 2 is directly radiated through the second power module water channel 23, avoiding the need for An additional cooling device for cooling the DC bus capacitor 2 is provided on the box body 1, which can reduce the number of parts while ensuring the safe use of the DC bus capacitor 2, greatly save the production cost and installation space, and further improve the structure It is more compact, so that the integration of the entire dual-motor inverter is high.

As shown in FIGS. 3-5 , the cooling water channel also includes a main box water channel 24. The main box water channel 24 is set to connect the first power module water channel 22 and the second power module water channel 23 in series. The main box water channel 24 includes two cylindrical water channels. The water channel 241 and one semi-cylindrical water channel 242, the two cylindrical water channels 241 and the semi-cylindrical water channel 242 are formed by die casting, so that the structure of the entire main tank water channel 24 can be simpler; The water channel 22 of the power module and the water channel 23 of the second power module are sealed by O-rings, and the back of the semi-cylindrical water channel 242 is sealed by the water channel sealing cover 25 and the water channel sealing ring 26, so as to avoid the leakage of the cooling medium and affect the whole cooling effect. In other embodiments, the water channel 24 of the main box body between the first power module 3 and the second power module 4 may also be sealed by friction stir welding or other sealing methods.

When cooling the first power module 3 and the second power module 4, the cooling liquid enters from the water inlet pipe 17, passes through the main box water channel 24 for transfer, then enters the first power module water channel 22, and then passes through the main box The body water channel 24 is switched, enters the water channel of the second power module water channel 23 , and finally flows out from the water outlet pipe 18 to complete the cooling of the first power module 3 and the second power module 4 .

As shown in FIG. 1 , the dual-motor inverter further includes a current sensor 11 . The AC side of the first power module 3 and the AC side of the second power module 4 are both provided with a current sensor 11 , and the control board 20 is electrically connected to the current sensor 11 . Connected so as to be able to transmit the current signal detected by the current sensor 11 to the control board 20 . In this embodiment, the current sensor 11 is a triple-type sensor, and the safety of the triple-type sensor is relatively high.

The dual-motor inverter also includes a plurality of wire harness holders (not shown in the figure), which are arranged to fix the plurality of wire harnesses in the dual-motor inverter; by using the wire harness holders at specific locations where the wires of the plurality of wire harnesses are routed Binding and fixing the wiring harness can avoid scratching the wiring harness to protect the wiring harness, so that the safety of the entire dual-motor inverter is higher; and the wiring harness is fixed at an appropriate position through the wiring harness fixing seat to further improve the dual-motor inverter. Vibration resistance of the inverter.

Claims

A dual motor inverter, comprising:

a box body (1), on which a retaining wall structure (28) is arranged;

a first power module (3) and a second power module (4), wherein the first power module (3) and the second power module (4) are installed side by side on the box body (1);

a DC bus capacitor (2), which is mounted on the box body (1), and the DC bus capacitor (2) is located at the bottom end of the second power module (4);

A first DC terminal block (7) and a second DC terminal block (8), the first DC terminal block (7) is arranged on the DC side of the first power module (3), and the first DC terminal block (7) is provided on the DC side of the first power module (3). The current connection seat (7) is arranged to connect the DC bus capacitor (2) and the first power module (3), and the second DC connection seat (8) is arranged on the side of the second power module (4). On the DC side, the second DC terminal block (8) is configured to connect the DC bus capacitor (2) and the second power module (4);

A DC connector (16) and an AC connector (15), both of which are arranged on the outer periphery of the box (1), and the DC connector (16) and the first power module (3) are respectively located at a first side and a second side of the retaining wall structure;

An electromagnetic filter (12), which is mounted on the box body (1), the electromagnetic filter (12) being configured to connect the DC connector (16) and the first DC connection seat (7) ;

A first AC connection seat (9) and a second AC connection seat (10), the first AC connection seat (9) is arranged on the AC side of the first power module (3), the first AC connection seat (10) (9) It is arranged to connect the AC busbar (29) of the drive motor of the vehicle and the first power module (3), so that the first AC terminal block (9) is connected to the AC busbar of the drive motor , the second AC wiring seat (10) is arranged on the AC side of the second power module (4), and the second AC wiring seat (10) is arranged to connect the AC connector (15) with the a second power module (4);

A first driving board (5) and a second driving board (6), the first driving board (5) is arranged on the first power module (3), and the second driving board (6) is arranged on the on the second power module (4), and both the first drive board (5) and the second drive board (6) are connected to the box (1) through two grounding bus bars, and the first drive board (5) and the second drive board (6) A plurality of discharge resistors (30) are arranged on both a driving board (5) and the second driving board (6).
The dual motor inverter of claim 1, further comprising:

an upper cover (19), which is arranged on the top of the box body (1);

a control board (20), which is arranged on the top of the upper cover (19), the control board (20) is electrically connected to the first driving board (5) and the second driving board (6), and The control board (20) is connected with the first driving board (5) through a board-to-board connector.
The dual-motor inverter according to claim 1, wherein the first DC terminal block (7) and the second DC terminal block (8) are respectively disposed on the first DC terminal block through an insert injection molding process. The DC side of the power module (3) and the DC side of the second power module (4).
The dual-motor inverter according to claim 1, wherein the structure of the first DC terminal block (7) is a laminated busbar structure.
The dual-motor inverter according to claim 1, wherein a cooling water channel connected in series is provided at the bottom of the box (1), and is configured to cool the first power module (3) and the second power module (4).
The dual motor inverter of claim 5, wherein the cooling water channel comprises:

a first power module water channel (22), which is arranged to cool the first power module (3);

A second power module water channel (23), which is configured to cool the second power module (4), and is coated between the second power module water channel (23) and the heat dissipation aluminum plate of the DC bus capacitor (2). There is thermally conductive adhesive, which is set to cool the DC bus capacitor (2);

A main box body water channel (24), which is arranged to connect the first power module water channel (22) and the second power module water channel (23) in series, and the main box body water channel (24) includes two cylindrical water channels ( 241) and a semi-cylindrical water channel (242), the two cylindrical water channels (241) and the semi-cylindrical water channel (242) are formed by die casting, and the main box water channel (24) is connected to the Both the first power module water channel (22) and the second power module water channel (23) are sealed by an O-ring seal, and the back of the semi-cylindrical water channel (242) is sealed by the water channel sealing cover (25) and the water channel Ring (26) seals.
The dual-motor inverter according to claim 1, wherein the first AC terminal block (9) and the second AC terminal block (10) are respectively disposed on the first power source through an insert injection molding process. The AC side of the module (3) and the AC side of the second power module (4).
The dual motor inverter of claim 2, further comprising:

A current sensor (11), the current sensor (11) is provided on both the AC side of the first power module (3) and the AC side of the second power module (4), and the control board (20) It is electrically connected to the current sensor (11).
The dual motor inverter of claim 1, further comprising:

A wire harness fixing seat, which is arranged to fix the wire harness in the dual-motor inverter.
An automobile, comprising a drive motor, a generator, and a dual-motor inverter as claimed in any one of claims 1 to 9, wherein the dual-motor inverter is provided between the drive motor and the generator .