Vehicle distributed drive system, vehicle charging system and vehicle

Abstract

The present invention provides a vehicle distributed drive system, a vehicle charging system and a vehicle. The vehicle distributed drive system includes a high-voltage battery, an inverter circuit, and four drive motors for driving the wheels. The high-voltage battery includes a battery positive electrode and a battery negative electrode, and a midpoint connection port is provided at the midpoint between the battery positive electrode and the battery negative electrode. One pair of the drive motors located at the diagonal positions is electrically connected to the battery positive electrode and the midpoint connection port through the inverter circuit, and the other pair of the drive motors located at the diagonal positions is electrically connected to the battery negative electrode and the midpoint connection port through the inverter circuit. Implementing the present invention can, on the premise of a high battery charging power during charging, charge the high-voltage battery with a high-voltage charging pile or a low-voltage charging pile, improve compatibility, and enable the high-voltage battery to use a low-voltage power module without using a silicon carbide module, thereby reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly relates to a vehicle distributed drive system, a vehicle charging system, and a vehicle. Background Art

[0002] Pure electric vehicles can be mainly divided into: centralized drive and distributed drive according to the structure form of the drive system. Among them, the centralized drive form is similar to the structure of traditional vehicles in structure, and a transmission device is required to transmit power to the drive wheels; while the distributed drive can be mainly divided into: in-wheel motor drive and hub motor drive according to the motor arrangement position. Distributed drive electric vehicles have better dynamic controllability, higher drive system efficiency, and system structure reliability, so they have become one of the hot research directions.

[0003] The existing distributed drive system includes a power battery and four hub motors (including a three-phase inverter circuit and a drive motor). The power battery is generally composed of multiple battery units (cells) connected in series and in parallel. The power battery includes a positive electrode and a negative electrode. The two ends of the four drive motors are respectively electrically connected to the positive electrode and the negative electrode of the power battery. The DC bus voltage of the existing distributed drive system is the output voltage of the power battery. The battery voltage level determines the motor voltage level, that is, when the power battery is a high-voltage battery, the voltage of the drive motor is a high-voltage; when the power battery is a low-voltage battery, the voltage of the drive motor is a low-voltage. Therefore, the compatibility of high and low voltage platforms is poor, and the high-voltage platform often needs to use silicon carbide modules, resulting in high costs.

[0004] Moreover, when the existing distributed drive system needs to be charged, it can only be charged using a corresponding charging pile. If the power battery is a high-voltage battery, without the help of a boost system, only a high-voltage charging pile can be used to charge it, and the charging compatibility is poor; if the power battery is a low-voltage battery, the charging pile can only charge it at a low voltage during charging. The charging power with the same current is less than that of the high-voltage battery, and the charging time is long and the efficiency is low. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the existing distributed drive system in poor drive platform and charging compatibility, and the high-voltage drive platform needs to use silicon carbide modules with high costs, and to provide a vehicle distributed drive system, a vehicle charging system, and a vehicle.

[0006] The technical solution of the present invention provides a vehicle distributed drive system, including a high-voltage battery, an inverter circuit, and four drive motors for driving the wheels. The high-voltage battery includes a battery positive electrode and a battery negative electrode, and a midpoint connection port is provided at the midpoint between the battery positive electrode and the battery negative electrode.

[0007] One pair of the drive motors located at the diagonal positions is electrically connected to the positive electrode of the battery and the midpoint connection port through the inverter circuit, and the other pair of the drive motors located at the diagonal positions is electrically connected to the negative electrode of the battery and the midpoint connection port through the inverter circuit.

[0008] In one alternative technical solution, the drive motors include a left front drive motor, a right front drive motor, a left rear drive motor, and a right rear drive motor, and the inverter circuit includes a first sub-inverter circuit, a second sub-inverter circuit, a third sub-inverter circuit, and a fourth sub-inverter circuit.

[0009] The left front drive motor is electrically connected to the midpoint connection port through one end of the first sub-inverter circuit, and the left front drive motor is electrically connected to the negative electrode of the battery through the other end of the first sub-inverter circuit.

[0010] The right front drive motor is electrically connected to the positive electrode of the battery through one end of the second sub-inverter circuit, and the right front drive motor is electrically connected to the midpoint connection port through the other end of the second sub-inverter circuit.

[0011] The left rear drive motor is electrically connected to the positive electrode of the battery through one end of the third sub-inverter circuit, and the left rear drive motor is electrically connected to the midpoint connection port through the other end of the third sub-inverter circuit.

[0012] The right rear drive motor is electrically connected to the midpoint connection port through one end of the fourth sub-inverter circuit, and the right rear drive motor is electrically connected to the negative electrode of the battery through the other end of the fourth sub-inverter circuit.

[0013] In one alternative technical solution, the drive motors include a left front drive motor, a right front drive motor, a left rear drive motor, and a right rear drive motor.

[0014] The inverter circuit includes a first sub-inverter circuit, a second sub-inverter circuit, a third sub-inverter circuit, and a fourth sub-inverter circuit.

[0015] The left front drive motor is electrically connected to the positive electrode of the battery through one end of the first sub-inverter circuit, and the left front drive motor is electrically connected to the midpoint connection port through the other end of the first sub-inverter circuit.

[0016] The right front drive motor is electrically connected to the midpoint connection port through one end of the second sub-inverter circuit, and the right front drive motor is electrically connected to the negative electrode of the battery through the other end of the second sub-inverter circuit.

[0017] The left rear drive motor is electrically connected to the midpoint wiring port through one end of the third sub-inverter circuit, and the left rear drive motor is electrically connected to the negative electrode of the battery through the other end of the third sub-inverter circuit;

[0018] The right rear drive motor is electrically connected to the positive electrode of the battery through one end of the fourth sub-inverter circuit, and the right rear drive motor is electrically connected to the midpoint wiring port through the other end of the fourth sub-inverter circuit.

[0019] In one alternative technical solution, the first sub-inverter circuit, the second sub-inverter circuit, the third sub-inverter circuit, and the fourth sub-inverter circuit each include three half-bridge circuits, each half-bridge circuit includes two transistors connected in series, and each drive motor is electrically connected to the midpoint between the two transistors of the corresponding half-bridge circuit.

[0020] In one alternative technical solution, the inverter circuit further includes a capacitor, and the capacitor is connected in parallel with the three half-bridge circuits.

[0021] The technical solution of the present invention further provides a vehicle charging system, including a charging pile and the vehicle distributed drive system as described above, and the charging pile is electrically connected to the vehicle distributed drive system.

[0022] In one alternative technical solution, the charging pile is a high-voltage charging pile, the positive electrode of the high-voltage charging pile is electrically connected to the positive electrode of the battery, and the negative electrode of the high-voltage charging pile is electrically connected to the negative electrode of the battery.

[0023] In one alternative technical solution, the positive electrode of the charging pile is electrically connected to any one of the drive motors in one pair of the drive motors, and the negative electrode of the charging pile is electrically connected to any one of the drive motors in the other pair of the drive motors.

[0024] In one alternative technical solution, it further includes an auxiliary charging module, and the charging pile is electrically connected to the vehicle distributed drive system through the auxiliary charging module.

[0025] The technical solution of the present invention further provides a vehicle, including the vehicle distributed drive system as described above.

[0026] After adopting the above technical solution, the following beneficial effects are achieved: By setting a midpoint connection port at the midpoint between the battery positive electrode and the battery negative electrode of the high-voltage battery, and electrically connecting one pair of drive motors located at the diagonal positions to the battery positive electrode and the midpoint connection port through an inverter circuit, and the other pair of drive motors located at the diagonal positions to the battery negative electrode and the midpoint connection port through an inverter circuit, it is possible to charge the high-voltage battery with a high-voltage charging pile or a low-voltage charging pile on the premise of a high battery charging power during charging, without the need to use a high-voltage drive platform in combination, improving the compatibility of the charging and drive platforms, and enabling the high-voltage battery to use a low-voltage power module without using a silicon carbide module, reducing costs, and at the same time making the power consumed by the high-voltage battery balanced by balancing the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Referring to the drawings, the disclosure of the present invention will become more understandable. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a vehicle distributed drive system provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a vehicle distributed drive system provided by another embodiment of the present invention;

[0030] Figure 3 shows a schematic circuit principle diagram of the vehicle distributed drive system of the present invention during charging;

[0031] Figure 4 is a schematic structural diagram of a vehicle charging system provided by an embodiment of the present invention;

[0032] Figure 5 is Figure 4 a schematic structural diagram of the vehicle charging system shown when charging with a high-voltage charging pile;

[0033] Figure 6 is Figure 4 a schematic structural diagram of the vehicle charging system shown when charging with a high-voltage charging pile or a low-voltage charging pile. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following further describes the specific embodiments of the present invention with reference to the drawings.

[0035] It is easy to understand that, according to the technical solution of the present invention, under the premise of not changing the essential spirit of the present invention, there are various structural ways and implementation ways that can be mutually replaced by those of ordinary skill in the art. Therefore, the following specific embodiments and the accompanying drawings are only exemplary illustrations of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the invention.

[0036] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and thus may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0037] As Figure 1 shown, a vehicle distributed drive system provided by an embodiment of the present invention includes a high-voltage battery 11, an inverter circuit 12, and four drive motors 13 for driving the wheels. The high-voltage battery 11 includes a battery positive electrode 111 and a battery negative electrode 112, and a midpoint connection port 113 is provided at the midpoint between the battery positive electrode 111 and the battery negative electrode 112.

[0038] One pair of drive motors 13 located at diagonal positions is electrically connected to the battery positive electrode 111 and the midpoint connection port 113 through the inverter circuit 12, and the other pair of drive motors 13 located at diagonal positions is electrically connected to the battery negative electrode 112 and the midpoint connection port 113 through the inverter circuit 12.

[0039] The vehicle distributed drive system provided by this embodiment mainly includes a high-voltage battery 11, an inverter circuit 12, and drive motors 13.

[0040] The high-voltage battery 11 is the power battery of the vehicle. The high-voltage battery 11 is composed of a plurality of battery cells connected in series and in parallel. The high-voltage battery 11 includes a battery positive electrode 111 and a battery negative electrode 112. A midpoint connection port 113 is arranged at the midpoint between the battery positive electrode 111 and the battery negative electrode 112. The midpoint connection port 113 divides the high-voltage battery 11 into two low-voltage batteries. A high-position battery is formed between the battery positive electrode 111 and the midpoint connection port 113, and a low-position battery is formed between the midpoint connection port 113 and the battery negative electrode 112, so that the high-voltage battery 11 can use low-voltage power modules without using silicon carbide modules, thereby reducing costs.

[0041] The four drive motors 13 are respectively located at the front left, front right, rear left and rear right of the vehicle. The drive motor 13 is equivalent to a three-phase winding. The neutral points of the three-phase windings of a pair of drive motors 13 located at the diagonal positions are electrically connected to the positive battery terminal 111 and the midpoint connection port 113 through the inverter circuit 12 to form a high-voltage drive; the neutral points of the three-phase windings of the other pair of drive motors 13 located at the diagonal positions are electrically connected to the negative battery terminal 112 and the midpoint connection port 113 through the inverter circuit 12 to form a low-voltage drive. When in use, the high-voltage drive and the low-voltage drive respectively drive the 4 wheels, and the balanced discharge of the high-voltage battery 11 can be maintained when the loads on both sides of the front-rear and left-right axes are unbalanced. Since the drive motor 13 has windings, Figure 1 is represented by an inductor, and the structure of the drive motor 13 is not limited to Figure 1 As shown, the drive motor 13 can adopt existing motor structures, such as induction motors, permanent magnet synchronous motors, etc. Its specific structure is not the improvement point of this application, so its specific structure will not be elaborated here.

[0042] In this embodiment, by setting a midpoint connection port at the midpoint between the positive battery terminal and the negative battery terminal of the high-voltage battery, and electrically connecting one pair of drive motors located at the diagonal positions to the positive battery terminal and the midpoint connection port through the inverter circuit, and the other pair of drive motors located at the diagonal positions to the negative battery terminal and the midpoint connection port through the inverter circuit, it is possible to charge the high-voltage battery with a high-voltage charging pile or a low-voltage charging pile on the premise of a high battery charging power during charging, without the need to use a high-voltage drive platform in combination, improving the compatibility of the charging and drive platforms, and enabling the high-voltage battery to use a low-voltage power module without using a silicon carbide module, reducing costs, and at the same time making the power consumed by the high-voltage battery balanced by balancing the load.

[0043] In one of the embodiments, as Figure 1 shown, the drive motor 13 includes a front left drive motor FL, a front right drive motor FR, a rear left drive motor RL, and a rear right drive motor RR. The inverter circuit 12 includes a first sub-inverter circuit 121, a second sub-inverter circuit 122, a third sub-inverter circuit 123, and a fourth sub-inverter circuit 124.

[0044] The front left drive motor FL is electrically connected to the midpoint connection port 113 through one end of the first sub-inverter circuit 121, and the front left drive motor FL is electrically connected to the negative battery terminal 112 through the other end of the first sub-inverter circuit 121.

[0045] The front right drive motor FR is electrically connected to the positive battery terminal 111 through one end of the second sub-inverter circuit 122, and the front right drive motor FR is electrically connected to the midpoint connection port 113 through the other end of the second sub-inverter circuit 122.

[0046] The left rear drive motor RL is electrically connected to the positive terminal of the battery 111 through one end of the third sub-inverter circuit 123, and the left rear drive motor RL is electrically connected to the midpoint wiring port 113 through the other end of the third sub-inverter circuit 123;

[0047] The right rear drive motor RR is electrically connected to the midpoint wiring port 113 through one end of the fourth sub-inverter circuit 124, and the right rear drive motor RR is electrically connected to the negative terminal of the battery 112 through the other end of the fourth sub-inverter circuit 124.

[0048] The right front drive motor FR and the left rear drive motor RL are electrically connected to the positive terminal of the battery 111 and the midpoint wiring port 113 through the first sub-inverter circuit 121 and the third sub-inverter circuit 123 respectively to form a high-voltage drive, and the left front drive motor FL and the right rear drive motor RR are electrically connected to the midpoint wiring port 113 and the negative terminal of the battery 112 through the second sub-inverter circuit 122 and the fourth sub-inverter circuit 124 respectively to form a low-voltage drive, so as to maintain the balanced discharge of the high-voltage battery 11 when the loads on both sides of the front and rear, left and right axes are unbalanced.

[0049] In one embodiment, as Figure 2 shown, the drive motor 13 includes a left front drive motor FL, a right front drive motor FR, a left rear drive motor RL, and a right rear drive motor RR, and the inverter circuit 12 includes a first sub-inverter circuit 121, a second sub-inverter circuit 122, a third sub-inverter circuit 123, and a fourth sub-inverter circuit 124.

[0050] The left front drive motor FL is electrically connected to the positive terminal of the battery 11 through one end of the first sub-inverter circuit 121, and the left front drive motor FL is electrically connected to the midpoint wiring port 113 through the other end of the first sub-inverter circuit 121;

[0051] The right front drive motor FR is electrically connected to the midpoint wiring port 113 through one end of the second sub-inverter circuit 122, and the right front drive motor FR is electrically connected to the negative terminal of the battery 112 through the other end of the second sub-inverter circuit 122;

[0052] The left rear drive motor RL is electrically connected to the midpoint wiring port 113 through one end of the third sub-inverter circuit 123, and the left rear drive motor RL is electrically connected to the negative terminal of the battery 112 through the other end of the third sub-inverter circuit 123;

[0053] The right rear drive motor RR is electrically connected to the positive terminal of the battery 111 through one end of the fourth sub-inverter circuit 124, and the right rear drive motor RR is electrically connected to the midpoint wiring port 113 through the other end of the fourth sub-inverter circuit 124.

[0054] The left front drive motor FL and the right rear drive motor RR are electrically connected to the positive battery terminal 111 and the midpoint connection port 113 through the first sub-inverter circuit 121 and the third sub-inverter circuit 123 respectively, forming a high-voltage drive. The right front drive motor FR and the left rear drive motor RL are electrically connected to the midpoint connection port 113 and the negative battery terminal 112 through the second sub-inverter circuit 122 and the fourth sub-inverter circuit 124 respectively, forming a low-voltage drive, thereby achieving balanced discharge of the high-voltage battery 11 when the loads on both sides of the front-rear and left-right axes are unbalanced.

[0055] In one embodiment, the first sub-inverter circuit 121, the second sub-inverter circuit 122, the third sub-inverter circuit 123, and the fourth sub-inverter circuit 124 each include three half-bridge circuits. Each half-bridge circuit includes two transistors connected in series, and each drive motor is electrically connected to the midpoint between the two transistors of the corresponding half-bridge circuit.

[0056] In one embodiment, the inverter circuit 12 further includes a capacitor, which is connected in parallel with the three half-bridge circuits and functions as a filter.

[0057] Taking the right front drive motor FR being electrically connected to the positive battery terminal 111 and the midpoint connection port 113 through the second sub-inverter circuit 122 and the right rear drive motor RR being electrically connected to the midpoint connection port 113 and the negative battery terminal 112 through the fourth sub-inverter circuit 124 as an example, the working principle of the vehicle distributed drive system of the present application during charging is described as follows. Figure 3 As shown, the second sub-inverter circuit 122 can be simplified to the first diode D1, the second diode D2, the first switch Q1, and the second switch Q2, and the fourth sub-inverter circuit 124 can be simplified to the third diode D3, the fourth diode D4, the third switch Q3, and the fourth switch Q4. The second sub-inverter circuit 122 and the fourth sub-inverter circuit 124 are connected in parallel with the charging pile through the capacitor C dc of the auxiliary charging module. The right front drive motor FR is equivalent to the first inductor L1, and the right rear drive motor RR is equivalent to the second inductor L2.

[0058] One end of the first inductor L1 is electrically connected to one end of the capacitor C dc The other end of the first inductor L1 is connected to the midpoint between the first diode D1 and the second diode D2. The other end of the first diode D1 is electrically connected to the positive battery terminal 111, and the other end of the second diode D2 is electrically connected to the midpoint connection port 113. One end of the second inductor L2 is electrically connected to the other end of the capacitor C dc The other end of the second inductor L2 is connected to the midpoint between the third diode D3 and the fourth diode D4. The other end of the third diode D3 is electrically connected to the midpoint connection port 113, and the other end of the fourth diode D4 is electrically connected to the negative battery terminal 112.

[0059] The first switch Q1 is connected in parallel with the first diode D1, the second switch Q2 is connected in parallel with the second diode D2, the third switch Q3 is connected in parallel with the third diode D3, and the fourth switch Q4 is connected in parallel with the fourth diode D4.

[0060] Capacitor C dc is connected in parallel with the positive and negative poles of the charging pile.

[0061] During charging, control the second switch Q2 and the third switch Q3 to close, and the first inductor L1 and the second inductor L2 store energy; control the first switch Q1 and the fourth switch Q4 to close, and the first inductor L1, the second inductor L2, and the charging pile charge the high-voltage battery 11 at the same time, achieving the function of boost charging, realizing charging of the high-voltage battery 11 by a low-voltage charging pile, and the windings of the two drive motors 13 are connected in series, and the common-mode inductance is increased to 2 times, which can further reduce the current ripple. At the same time, it is also possible to control the second switch Q2 and the fourth switch Q4 to close, and the charging pile charges the low-position battery; control the first switch Q1 and the third switch Q3 to close, and the charging pile charges the high-position battery 11, and switch back and forth to realize charging of the high-voltage battery 11 by a low-voltage charging pile.

[0062] Similarly, the working principle that the left rear drive motor RL is electrically connected to the battery positive electrode 111 and the midpoint wiring port 113 through the third sub-inverter circuit 123, the left front drive motor FL is electrically connected to the midpoint wiring port 113 and the battery negative electrode 112 through the first sub-inverter circuit 121, and the left front drive motor FL and the right rear drive motor RR are electrically connected to the battery positive electrode 111 and the midpoint wiring port 113 through the first sub-inverter circuit 121 and the third sub-inverter circuit 123 respectively, and the right front drive motor FR and the left rear drive motor RL are electrically connected to the midpoint wiring port 113 and the battery negative electrode 112 through the second sub-inverter circuit 122 and the fourth sub-inverter circuit 124 respectively is the same as the above, and will not be elaborated here.

[0063] Preferably, in order to improve accuracy and performance, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are semiconductor power switches.

[0064] The technical solution of the present invention also provides a vehicle charging system, as Figure 4 shown, including a charging pile 20 and the vehicle distributed drive system 10 as described above, and the charging pile 20 is electrically connected to the vehicle distributed drive system 10.

[0065] The vehicle charging system provided in this embodiment mainly includes a vehicle distributed drive system 10 and a charging pile 20. The vehicle distributed drive system 10 adopts the above-mentioned vehicle distributed drive system, and its specific structure and working principle will not be elaborated here. The charging pile 20 can adopt an existing low-voltage charging pile. The charging pile 20 is electrically connected to the vehicle distributed drive system 10. For example, the positive pole of the charging pile 20 is electrically connected to the positive pole 111 of the battery of the vehicle distributed drive system 10, and the negative pole of the charging pile 20 is electrically connected to the negative pole 112 of the battery of the vehicle distributed drive system 10; or the positive pole of the charging pile 20 is electrically connected to any one of the high-position electric drives, and the negative pole of the charging pile 20 is electrically connected to any one of the low-position electric drives. Thus, when charging, on the premise of high battery charging power, the high-voltage battery can be charged with a high-voltage charging pile or a low-voltage charging pile, and there is no need to use a high-voltage drive platform in combination, which improves the compatibility of the charging and drive platforms, and enables the high-voltage battery to use a low-voltage power module without using a silicon carbide module, reducing costs. At the same time, the power consumed by the high-voltage battery is balanced by load balancing.

[0066] In one embodiment, as Figure 5 shown, for the convenience of charging, the charging pile is a high-voltage charging pile. The positive pole of the charging pile 20 is electrically connected to the positive pole 111 of the battery, and the negative pole of the charging pile 20 is electrically connected to the negative pole 112 of the battery.

[0067] In one embodiment, as Figure 6 shown, the positive pole of the charging pile 20 is electrically connected to any one of the driving motors 13 in one pair of driving motors 13, and the negative pole of the charging pile 20 is electrically connected to any one of the driving motors 13 in the other pair of driving motors 13.

[0068] The positive pole of the charging pile 20 is electrically connected to the neutral point of any one of the high-position electric drives (such as Figure 1 the right front driving motor FR or the left rear driving motor RL shown), and the negative pole of the charging pile 20 is electrically connected to the neutral point of any one of the low-position electric drives (such as Figure 1 the left front driving motor FL or the right rear driving motor RR shown), thus facilitating charging.

[0069] In one embodiment, as Figure 4 shown, it further includes an auxiliary charging module 30. The charging pile 20 is electrically connected to the vehicle distributed drive system through the auxiliary charging module 30, and the auxiliary charging module 30 plays a role in voltage stabilization and filtering.

[0070] Preferably, the auxiliary charging module 30 includes a relay and a capacitor. During charging, the opening and closing of the relay are controlled according to requirements, and the capacitor is connected in parallel between the positive and negative poles of the charging pile.

[0071] The technical solution of the present invention further provides a vehicle, including the vehicle distributed drive system as described above.

[0072] In this embodiment, through the vehicle distributed drive system, when charging, on the premise of a high battery charging power, the high-voltage battery can be charged by a high-voltage charging pile or a low-voltage charging pile, and there is no need to use a high-voltage drive platform in combination, which improves the compatibility of the charging and drive platforms, and enables the high-voltage battery to use a low-voltage power module without using a silicon carbide module, reducing costs. At the same time, the power consumed by the high-voltage battery is balanced by load balancing.

[0073] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle distributed drive system, characterized in that: It includes a high-voltage battery, an inverter circuit, four drive motors for driving the wheel hub, and an auxiliary capacitor connected in parallel with the positive and negative electrodes of the charging pile. The high-voltage battery includes a positive electrode and a negative electrode. A midpoint wiring port is provided at the midpoint between the positive electrode and the negative electrode. A pair of the drive motors located at one of the diagonal positions are electrically connected to the positive electrode of the battery and the midpoint wiring port through the inverter circuit, and a pair of the drive motors located at the other diagonal position are electrically connected to the negative electrode of the battery and the midpoint wiring port through the inverter circuit; The inverter circuit includes a first diode, a second diode, a first switch, a second switch, a third diode, a fourth diode, a third switch and a fourth switch. One end of one of the drive motors in a pair of diagonal positions is electrically connected to one end of the auxiliary capacitor, and the other end is connected to the midpoint between the first diode and the second diode, the other end of the first diode is electrically connected to the positive electrode of the battery, and the other end of the second diode is electrically connected to the midpoint wiring port; one end of one of the drive motors in a pair of diagonal positions is electrically connected to the other end of the auxiliary capacitor, and the other end is connected to the midpoint between the third diode and the fourth diode, the other end of the third diode is electrically connected to the midpoint wiring port, and the other end of the fourth diode is electrically connected to the negative electrode of the battery; the first switch is connected in parallel with the first diode, the second switch is connected in parallel with the second diode, the third switch is connected in parallel with the third diode, and the fourth switch is connected in parallel with the fourth diode; During charging, the second switch and the third switch are first controlled to be closed, so that one of the drive motors in a pair of the drive motors located at one of the diagonal positions and one of the drive motors in another diagonal position store energy; then the first switch and the fourth switch are controlled to be closed, so that one of the drive motors in a pair of the drive motors located at one of the diagonal positions, one of the drive motors in another diagonal position and the charging pile charge the high-voltage battery at the same time, thereby achieving boost charging and enabling the low-voltage charging pile to charge the high-voltage battery.

2. The vehicle distributed drive system according to claim 1, characterized in that: The drive motor includes a left front drive motor, a right front drive motor, a left rear drive motor and a right rear drive motor, and the inverter circuit includes a first sub-inverter circuit, a second sub-inverter circuit, a third sub-inverter circuit and a fourth sub-inverter circuit. The left front drive motor is electrically connected to the midpoint wiring port through an end of the first sub-inverter circuit, and the left front drive motor is electrically connected to the negative electrode of the battery through the other end of the first sub-inverter circuit; The right front drive motor is electrically connected to the positive electrode of the battery through one end of the second sub-inverter circuit, and the right front drive motor is electrically connected to the midpoint wiring port through the other end of the second sub-inverter circuit; The left rear drive motor is electrically connected to the positive electrode of the battery through one end of the third sub-inverter circuit, and the left rear drive motor is electrically connected to the midpoint wiring port through the other end of the third sub-inverter circuit; The right rear drive motor is electrically connected to the midpoint wiring port through one end of the fourth sub-inverter circuit, and the right rear drive motor is electrically connected to the negative electrode of the battery through the other end of the fourth sub-inverter circuit.

3. The vehicle distributed drive system according to claim 1, characterized in that: The drive motor includes a left front drive motor, a right front drive motor, a left rear drive motor and a right rear drive motor, and the inverter circuit includes a first sub-inverter circuit, a second sub-inverter circuit, a third sub-inverter circuit and a fourth sub-inverter circuit. The left front drive motor is electrically connected to the positive electrode of the battery through one end of the first sub-inverter circuit, and the left front drive motor is electrically connected to the midpoint wiring port through the other end of the first sub-inverter circuit; The right front drive motor is electrically connected to the midpoint wiring port through one end of the second sub-inverter circuit, and the right front drive motor is electrically connected to the negative electrode of the battery through the other end of the second sub-inverter circuit; The left rear drive motor is electrically connected to the midpoint wiring port through one end of the third sub-inverter circuit, and the left rear drive motor is electrically connected to the negative electrode of the battery through the other end of the third sub-inverter circuit; The right rear drive motor is electrically connected to the positive electrode of the battery through one end of the fourth sub-inverter circuit, and the right rear drive motor is electrically connected to the midpoint wiring port through the other end of the fourth sub-inverter circuit.

4. The vehicle distributed drive system according to claim 2 or 3, characterized in that: The first sub-inverter circuit, the second sub-inverter circuit, the third sub-inverter circuit and the fourth sub-inverter circuit each include three half-bridge circuits, each of the half-bridge circuits includes two transistors connected in series, and each of the drive motors is electrically connected to the midpoint between the two transistors of the corresponding half-bridge circuit.

5. The vehicle distributed drive system according to claim 4, characterized in that: The inverter circuit further includes a capacitor, which is connected in parallel with the three half-bridge circuits.

6. A vehicle charging system, characterized in that: It comprises a charging pile and a vehicle distributed drive system as described in any one of claims 1 to 5, wherein the charging pile is electrically connected to the vehicle distributed drive system.

7. The vehicle charging system according to claim 6, characterized in that: The charging pile is a high-voltage charging pile, the positive electrode of the high-voltage charging pile is electrically connected to the positive electrode of the battery, and the negative electrode of the high-voltage charging pile is electrically connected to the negative electrode of the battery.

8. The vehicle charging system according to claim 6, characterized in that: The positive pole of the charging pile is electrically connected to any one of the driving motors in one pair of the driving motors, and the negative pole of the charging pile is electrically connected to any one of the driving motors in the other pair of the driving motors.

9. The vehicle charging system according to any one of claims 6 to 8, characterized in that: It also includes an auxiliary charging module, and the charging pile is electrically connected to the vehicle distributed drive system through the auxiliary charging module.

10. A vehicle, characterized in that: Comprising a vehicle distributed drive system as described in any one of claims 1-5.

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