CN209566874U - High-voltage junction box for rear axle electric drive system of hybrid electric vehicle - Google Patents

Abstract

The utility model discloses a high-voltage junction box of a rear axle electric drive system of a hybrid vehicle. The high-voltage junction box includes a high-voltage junction box shell; Connection; the motor controller is connected to the motor through a three-phase line; the terminal of the charging input line is set on the high-voltage junction box shell between the positive terminal of the power battery output and the negative terminal of the power battery output; the charging input line and the high-voltage branch line Charging relay connection inside the case housing. With the above technical solution, only the positive and negative cables of the power battery enter the junction box of the high-voltage box, and the output UVW three-phase is directly connected to the motor. The power demand of other loads can be reasonably arranged and distributed, which greatly reduces the wiring Quantity; high and low voltage lines are separated to avoid signal interference; the structure is compact and clear, the layout is reasonable, and the safety is high.

Description

High-voltage junction box for rear axle electric drive system of hybrid electric vehicle

technical field

The utility model belongs to the technical field of hybrid electric vehicle power systems. More specifically, the utility model relates to a high-voltage junction box of a rear axle electric drive system of a hybrid vehicle.

Background technique

In the current situation of vigorously advocating the transition of automobiles from traditional power to pure electric power, it is an easier and more advantageous method to use hybrid power for transition.

For a hybrid electric vehicle with rear axle electric drive, it is required to complete the arrangement of battery, electric control, motor and rear drive axle in a very limited layout space. When arranging electrical wiring harnesses, the mutual interference of high and low voltage wiring harnesses, the operability of wiring and the existing safety hazards should also be considered.

Generally, in the electric drive system, the high-voltage junction box is the pivotal mechanism from the power battery to other load components. It needs to distribute electric energy to the motor and on-board DCDC. At the same time, the electric energy input by the external charging mechanism also enters the battery through the high-voltage junction box.

There are many high-voltage and low-voltage wire harnesses between the battery pack of hybrid electric vehicles and the rear axle motor, and the space is small, resulting in difficult wiring and easy interference.

Utility model content

The utility model provides a high-voltage junction box for a rear axle electric drive system of a hybrid vehicle, and aims to solve the problem of high and low voltage wiring harness arrangement between a battery pack and a rear axle motor.

In order to achieve the above object, the technical scheme that the utility model takes is:

The utility model relates to a high-voltage junction box for a rear axle electric drive system of a hybrid electric vehicle. The hybrid electric vehicle is provided with a motor, a motor controller, and a power battery, and the high-voltage junction box includes a high-voltage junction box housing; The motor controller is connected to the power battery through the power battery output positive terminal and the power battery output negative terminal; the motor controller is connected to the motor through a three-phase line; at the power battery output positive terminal and the power battery output negative terminal The terminal of the charging input line is arranged on the shell of the high-voltage junction box between them; the charging input line is connected with the charging relay in the shell of the high-voltage junction box.

The positive input terminal of the motor controller is connected to the positive output terminal of the power battery through the first bent copper sheet and the main positive fuse; the negative terminal of the motor controller is connected through the second bent copper The sheet is connected to the negative output terminal of the power battery.

The housing of the high-voltage junction box is provided with a DCDC positive line, one end of the DCDC positive line is connected to one end of the DCDC fuse; the other end of the DCDC fuse is connected to the main positive fuse; the DCDC The other end of the positive pole line is connected to the DCDC output line.

The housing of the high-voltage junction box is provided with a charging positive line and a charging negative line, and one end of the charging positive line and the charging negative line is respectively connected to the charging input line; the other end of the charging positive line is connected to the charging line. The charging relay is connected; the other end of the charging negative line is connected to the DCDC output line.

The motor controller is provided with a low-voltage connector of the motor controller, and the low-voltage connector of the motor controller is connected to the low-voltage control line of the high-voltage junction box, and the low-voltage control line of the high-voltage junction box passes through the high-voltage distribution box. Junction box shell to the outside of the high voltage junction box.

The charging relay is connected with the low-voltage connector of the motor controller through a charging relay control circuit.

The three-phase lines are V-phase lines, U-phase lines and W-phase lines respectively; the V-phase lines, U-phase lines and W-phase lines are respectively connected to the motor controller through the controller output terminals.

The three-phase line and the positive and negative lines of the power battery are installed and fixed on the high-voltage junction box casing through a sliding lock sleeve and a metal threaded sleeve.

The high-voltage junction box is arranged under the vehicle body as a whole, between the power battery and the rear axle drive motor.

A charging fuse is arranged in the housing of the high-voltage junction box, and the charging fuse is respectively connected to the charging relay and the output positive terminal of the power battery.

The utility model adopts the above-mentioned technical scheme, only the positive and negative cables of the power battery enter the junction box of the high-voltage box, and the output UVW three-phase is directly connected to the motor, and the power demand of other loads can be reasonably arranged and distributed, greatly The number of wiring is reduced; the high and low voltage lines are separated to avoid signal interference; the structure is compact and clear, the layout is reasonable, and the safety is high.

Description of drawings

The contents shown in the accompanying drawings and the marks in the drawings are briefly explained as follows:

Fig. 1 is a schematic diagram of the internal structure of the high-voltage junction box of the present invention.

Labeled in the figure:

1. Charging input line, 2. Power battery output positive terminal, 3. DCDC fuse, 4. Main positive fuse, 5. Charging fuse, 6. First bent copper sheet, 7. Motor controller positive terminal input Binding post, 8. Motor controller, 9. V-phase line, 10. Controller output terminal, 11. U-phase line, 12. W-phase line, 13. Power battery output negative terminal, 14. Charging positive line, 15 . Charging relay, 16. DCDC positive circuit, 17. Charging relay control circuit, 18. Charging negative circuit, 19. Second bending copper sheet, 20. DCDC output circuit, 21. Motor controller low voltage connector, 22. High voltage The low-voltage control circuit of the junction box, 23, the housing of the high-voltage junction box, and 24, the negative terminal terminal of the motor controller.

Detailed ways

Next, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation of the utility model will be further described in detail, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the utility model .

The structure of the present utility model as shown in Figure 1 is a high-voltage junction box of a rear axle electric drive system of a hybrid vehicle, and the hybrid vehicle is provided with a motor, a motor controller 8, a power battery, and the high-voltage branch line The box includes a high voltage distribution box housing 23 . The arrangement scheme of the high-voltage junction box proposed by the utility model is suitable for the electric drive system of the rear axle of the hybrid electric vehicle. It is used to solve the problem of difficult wiring and easy interference caused by the large number of high and low voltage wire harnesses and small space between the hybrid vehicle battery pack and the rear axle motor, and meets actual needs.

In order to overcome the defects of the prior art and achieve the purpose of the invention to solve the problem of high and low voltage wire harness arrangement between the battery pack and the rear axle motor, the technical solution adopted by the utility model is:

As shown in Figure 1, in the high-voltage junction box of the rear axle electric drive system of the utility model, the motor controller 8 is connected to the power battery through the power battery output positive terminal 2 and the power battery output negative terminal 13; The motor controller 8 described above is connected to the motor through a three-phase line; the terminal of the charging input line 1 is set on the high-voltage junction box housing 23 between the positive output terminal 2 of the power battery and the negative output terminal 13 of the power battery. ; The charging input line 1 is connected to the charging relay 15 in the housing 23 of the high-voltage junction box.

The high-voltage junction box proposed by the utility model distributes the output of the power battery. One end of the charging relay 15 is connected to the insulating column through a wire, and the other end is connected to the positive pin of the charging port connector through a wire. The low-voltage control circuit of the charging relay 15 is connected to two pins of the body floor wiring harness connector through a wire.

According to the state requirements of the motor controller 8, DCDC and charging control, the utility model provides a high-voltage junction box structure integrating control and circuit distribution. Only the positive and negative cables of the power battery enter the junction box of the high-voltage box, and the output UVW three-phase is directly connected to the motor. The power demand of other loads can be reasonably arranged and distributed, which greatly reduces the number of wiring; high and low voltage lines Separated to avoid signal interference; compact and clear structure, reasonable layout, high security. For the hybrid electric vehicle system with rear axle electric drive, it can meet the requirements of body structure and vehicle power at the same time.

The positive terminal input terminal 7 of the motor controller is connected to the positive output terminal 2 of the power battery through the first bent copper sheet 6 and the main positive fuse 4; the negative terminal terminal 24 of the motor controller is connected through The second bent copper sheet 19 is connected to the output negative terminal 13 of the power battery.

The power battery output positive terminal 2 and the first bent copper sheet 6 are fixed on the main positive insulating column of the high-voltage junction box. The three insulating posts are connected to each other through a copper sheet. One of the insulating posts is connected to the positive pin of the DCDC connector through a wire.

The output negative terminal 13 of the power battery and the second bent copper sheet 19 are fixed on the general negative pole insulating column of the high voltage junction box.

The other end of the second bent copper sheet 19 is fixed on the negative end of the motor controller 8, while the negative end of the motor controller 8 is connected to the negative pin of the charging port connector through a wire, and connected to the negative pin of the charging port connector through another wire. To the negative pin of the DCDC connector.

The high-voltage distribution box housing 23 is provided with a DCDC positive line 16, one end of the DCDC positive line 16 is connected to one end of the DCDC fuse 3; the other end of the DCDC fuse 3 is connected to the main positive fuse 4 connection; the other end of the DCDC positive line 16 is connected to the DCDC output line 20.

The power battery output positive terminal 2 is connected to the main positive insulating column of the high-voltage junction box, and the main positive insulating column of the high-voltage junction box is connected to the main positive fuse 4 in turn, and the first bent copper sheet 6 reaches the positive terminal terminal of the motor controller 7; At the same time, the main positive insulating column of the high-voltage junction box is connected to the DCDC fuse 3 in turn through the copper sheet, and the DCDC positive line 16 reaches the DCDC output line 20; at the same time, the main positive insulating column of the high-voltage junction box is connected to the charging fuse in turn through the copper sheet 5. The charging relay 15, the charging positive line 14 reaches the charging input line 1; the output negative terminal 13 of the power battery is connected to the main negative insulating column of the high-voltage junction box, and reaches the negative terminal terminal of the motor controller through the second bent copper sheet 19 ; The negative line 18 in the charging input line 1 is connected to the negative terminal terminal of the motor controller, and the DCDC negative line is also connected to the negative terminal terminal of the motor controller.

The motor controller 8 is installed in the high-voltage junction box and fixed with four studs; the main positive fuse 4 is fixed on the positive terminal terminal 7 of the motor controller and the other side of the second bent copper sheet 19 on one terminal.

The DCDC fuse 3 is fixed on two insulating posts through studs; the charging fuse 5 is fixed on the insulating posts through studs.

In the motor controller part, the power supply is input to the motor controller 8 through the main positive fuse 4, and the CAN communication signal sent by the whole vehicle through the low-voltage control line of the motor controller 8 is used to control the motor controller in real time to meet the needs of the whole vehicle. The demand for motor power;

In the DCDC working part, the power supply can input high-voltage electricity to the DCDC of the whole vehicle through the DCDC fuse 3 to realize charging of the low-voltage battery;

In the charging control part, the BMS controls the working state of the charging relay 15. When the relay is closed, the power provided by the charger reaches the power battery through the relay and the charging fuse 5 to realize the charging function.

The high-voltage junction box housing 23 is provided with a charging positive line 14 and a charging negative line 18, and one end of the charging positive line 14 and the charging negative line 18 is connected to the charging input line 1 respectively; The other end of the line 14 is connected to the charging relay 15 ; the other end of the charging negative line 18 is connected to the DCDC output line 20 .

Described motor controller 8 is provided with motor controller low-voltage connector 21, and described motor controller low-voltage connector 21 connects the low-voltage control circuit 22 of high-voltage junction box, and the low-voltage control circuit of described high-voltage junction box 22 passes through the high-voltage junction box housing 23 to the outside of the high-voltage junction box.

One end of the motor controller low-voltage working circuit is connected to the motor controller 8 through a standard 35-pin connector, and the other end is connected to the corresponding pin of the body floor wiring harness connector together with the low-voltage control circuit of the charging relay 15 .

The charging relay 15 is connected with the low-voltage connector 21 of the motor controller through a charging relay control circuit 17 .

The three-phase lines are V-phase lines 9, U-phase lines 11 and W-phase lines 12 respectively; the V-phase lines 9, U-phase lines 11 and W-phase lines 12 are respectively connected with the output terminal 10 of the controller. The motor controller 8 described above is connected.

The three-phase output terminal of the motor controller 8 is correspondingly connected to the UVW three-phase line of the motor. The three-phase lines and the positive and negative lines of the power battery are installed and fixed on the high-voltage junction box housing 23 through sliding lock sleeves and metal threaded sleeves.

The high-voltage junction box is arranged under the vehicle body as a whole, between the power battery and the rear axle drive motor. The upper portion of the entire high-voltage junction box is suspended and fixed on the vehicle body by four studs.

A charging fuse 5 is arranged inside the high-voltage junction box housing 23 , and the charging fuse 5 is respectively connected to the charging relay 15 and the output positive terminal 2 of the power battery.

The high-voltage junction box structure proposed by the utility model only needs two lines to be connected with the power battery, which directly reduces the influence of the number of interfaces on the protection level of the battery. The DCDC and motor of the hybrid electric vehicle are connected to the power supply from the corresponding line of the high-voltage junction box, which can reduce the number and length of the lines connected to the power battery. Partial isolation can avoid the impact of replacement insurance on the battery protection level in case of failure.

Since the main positive relay, main negative relay and predictive relay structure are already installed inside the general power battery, the main positive relay and pre-charging relay are canceled in the high-voltage junction box of this scheme, which simplifies the structure and reduces the cost.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned methods, as long as various insubstantial improvements are made by adopting the method concept and technical solutions of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model.

Claims (10)

1. hybrid vehicle rear axle electric drive system high pressure junction box, motor, motor control is arranged in the hybrid vehicle Device (8), power battery, the high pressure junction box include high pressure junction box shell (23), it is characterised in that: the motor control Device (8) processed is connect by power battery output cathode end (2), power battery output negative pole end (13) with power battery；Described Electric machine controller (8) is connected to motor by three-phase line；It is defeated in the power battery output cathode end (2), power battery The terminals of charging incoming line (1) are set on the high pressure junction box shell (23) between negative pole end (13) out；The charging Incoming line (1) is connect with the charge relay (15) in high pressure junction box shell (23).

2. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described Electric machine controller positive terminal lead-in clamp (7) passes through the first bending copper sheet (6) Ji Zhuzheng fuse (4) and the power electric Pond output cathode end (2) connection；The electric machine controller negative pole end binding post (24) passes through the second bending copper sheet (19) and institute Power battery output negative pole end (13) connection stated.

3. hybrid vehicle rear axle electric drive system high pressure junction box according to claim 2, it is characterised in that: described DCDC anode route (16) is equipped in high pressure junction box shell (23), described DCDC anode route (16) one end and DCDC fuse One end of device (3) connects；The other end of the DCDC fuse (3) is connect with main positive fuse (4)；The DCDC anode Route (16) other end is connect with DCDC outlet line (20).

4. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 3, it is characterised in that: described Charge positive route (14) and charging anode circuit (18), the charging anode route are equipped in high pressure junction box shell (23) (14) it is connect respectively with charging incoming line (1) with one end of charging anode circuit (18)；The charging anode route (14) The other end connect with the charge relay (15)；The other end and DCDC output line of the charging anode circuit (18) Road (20) connection.

5. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described Electric machine controller (8) is equipped with electric machine controller low pressure connector (21), and the electric machine controller low pressure connector (21) is even The low-voltage control line (22) of high pressure junction box is connect, the low-voltage control line (22) of the high pressure junction box passes through high pressure separated time Outside box shell (23) to high pressure junction box.

6. hybrid vehicle rear axle electric drive system high pressure junction box according to claim 5, it is characterised in that: described Charge relay (15) is connect by charge relay control route (17) with the electric machine controller low pressure connector (21).

7. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described Three-phase line is respectively V phase line (9), U phase line (11) and W phase line (12)；The V phase line (9), U phase line (11) it is connect respectively by controller output wiring terminal (10) with the electric machine controller (8) with W phase line (12).

8. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described High pressure junction box integral arrangement is below vehicle body, between power battery and rear bridge driven motor.

9. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described Setting charging fuse (5), the charging fuse (5) are separately connected charge relay in high pressure junction box shell (23) (15) and power battery output cathode end (2).

10. hybrid vehicle rear axle electric drive system high pressure junction box described in accordance with the claim 1, it is characterised in that: described Three-phase line and the positive and negative anodes circuit of power battery pass through sliding lock set and metal threaded set is fixed on high pressure separated time On box shell (23).