A boost charging system, method, and vehicle for a vehicle

Abstract

The application discloses a kind of boost charging system, method and vehicle for vehicle, the system includes: battery pack, for being electrically connected with charging pile;Control subsystem includes motor controller and boost charging device, motor controller is connected with battery pack, the input of boost charging device is electrically connected with charging pile;Three-phase drive motor includes motor winding, the first end of motor winding is connected with motor controller, the end of motor winding is connected as the center point of three-phase drive motor, and is connected with the output of boost charging device, the control end of battery pack, motor controller and boost charging device is used to be electrically connected with the battery management system of vehicle, in charging state, battery management system is used to send charging control signal to battery pack, motor controller and boost charging device according to the voltage provided by charging pile.The system can better avoid the generation of temperature rise risk and torque, and be beneficial to improve the versatility and stability of vehicle charging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a boost charging system for a vehicle, a method and a vehicle. BACKGROUND

[0002] The voltage platform of current new energy vehicles gradually converts to high voltage, and many vehicle enterprises on the market have successively appeared vehicles with 800V voltage platform, but the voltage platform development of charging piles has not achieved rapid popularization like the voltage platform of vehicles. Therefore, users have the demand of using 400V platform charging piles to realize 800V charging. The current boost charging circuit generally increases a boost DC / DC bridge circuit between the positive and negative buses between the charging pile and the battery pack. The principle of the boost circuit is to realize the rise and fall of voltage through the energy storage of inductance. For new energy vehicles, the motor winding itself is a large inductance, and the use of motor winding inductance to realize the BOOST boost function can greatly reduce the cost.

[0003] In the prior art, for the boost charging of the motor, stable control cannot be achieved, and the temperature rise risk and torque generation caused by the charging process cannot be well avoided. SUMMARY

[0004] The application embodiment provides a boost charging system for a vehicle, a method and a vehicle, which can realize more stable control in a boost charging structure modification mode with less cost, well avoids the temperature rise risk and torque generation, and is beneficial to improve the universality and stability of vehicle charging.

[0005] In the first aspect, the present application provides the following technical scheme through an embodiment of the present application:

[0006] A boost charging system for a vehicle, comprising: a battery pack configured to be electrically connected with a charging pile; a control subsystem comprising a motor controller and a boost charging device, the motor controller being connected with the battery pack, and an input end of the boost charging device being electrically connected with the charging pile; a three-phase drive motor comprising a motor winding, a first end of the motor winding being connected with the motor controller, and a last end of the motor winding being connected, serving as a center point of the three-phase drive motor and being connected with an output end of the boost charging device; control ends of the battery pack, the motor controller and the boost charging device are configured to be electrically connected with a battery management system of the vehicle, and in a charging state, the battery management system is configured to send a charging control signal to the battery pack, the motor controller and the boost charging device according to a voltage provided by the charging pile.

[0007] Preferably, the three-phase driving motor further comprises a three-phase contactor and a multiplexer; the three-phase contactor is connected across the two ends of the motor winding, the ends of the motor winding are connected through the multiplexer, the output end of the multiplexer serves as the center point of the three-phase driving motor and is connected with the output end of the voltage boosting charging device; the motor controller is electrically connected with the three-phase contactor and the multiplexer respectively, if the charging control signal received by the motor controller is a voltage boosting control signal, the three-phase contactor is controlled to be opened and the multiplexer is controlled to be closed based on the voltage boosting control signal, if the charging control signal received is a normal working signal, the three-phase contactor is controlled to be closed and the multiplexer is controlled to be opened.

[0008] Preferably, the voltage boosting charging device comprises a first charging switch, a second charging switch, a pre-charging capacitor, a field effect transistor, a bleeder resistor and a voltage detector; the first end of the first charging switch is in communication with the positive electrode of the charging pile, the first end of the second charging switch is in communication with the negative electrode of the charging pile, the two ends of the pre-charging capacitor are connected with the second end of the first charging switch and the second end of the second charging switch respectively, the voltage detector is connected with the pre-charging capacitor in parallel, and the field effect transistor and the bleeder resistor are connected in series and then connected with the pre-charging capacitor in parallel; the second end of the first charging switch is also connected with the center point of the three-phase driving motor.

[0009] Preferably, the voltage boosting charging device comprises a first charging switch, a second charging switch, a pre-charging capacitor, a field effect transistor, a bleeder resistor and a voltage detector; the first end of the first charging switch is in communication with the positive electrode of the charging pile, the first end of the second charging switch is in communication with the negative electrode of the charging pile, the two ends of the pre-charging capacitor are connected with the second end of the first charging switch and the second end of the second charging switch respectively, the voltage detector is connected with the pre-charging capacitor in parallel, and the field effect transistor and the bleeder resistor are connected in series and then connected with the pre-charging capacitor in parallel; the second end of the first charging switch is also connected with the center point of the three-phase driving motor.

[0010] Preferably, the voltage boosting charging device further comprises a first control switch, a second control switch and an inductor; the first ends of the first control switch and the second control switch are connected with the output end of the voltage boosting charging device, the second control switch and the inductor are connected in series and then connected with the first control switch in parallel, and the second end of the first control switch is connected with the center point of the three-phase driving motor.

[0011] Preferably, the battery pack comprises a first switch, a second switch, a third switch, a fourth switch and a battery module; a first end of the first switch is connected with a positive electrode of the battery module, a second end of the first switch is connected with a first end of the third switch, a second end of the third switch is in communication with a positive electrode of the charging pile, a first end of the second switch is connected with a negative electrode of the battery module, a second end of the second switch is connected with a first end of the fourth switch, and a second end of the fourth switch is in communication with a negative electrode of the charging pile.

[0012] In a second aspect, the present application provides the following technical solutions through an embodiment of the present application.

[0013] A boosting charging method for a vehicle, applied to the battery management system of any one of the preceding first aspect, the method comprising: acquiring a voltage provided by a charging pile; and sending a charging control signal to a battery pack, a motor controller and a boosting charging device according to the voltage.

[0014] Preferably, after the sending of the charging control signal to the battery pack, the motor controller and the boosting charging device, the method further comprises: if the charging control signal is a boosting control signal, controlling a three-phase contactor to be disconnected and a multiplexer to be closed through the motor controller; and if the charging control signal is a normal working signal, controlling the three-phase contactor to be closed and the multiplexer to be disconnected through the motor controller.

[0015] Preferably, if the charging control signal is a boosting control signal, the method further comprises: controlling a third switch to be disconnected and a first switch, a second switch, a fourth switch and a charging switch to be closed; and if the charging control signal is a normal working signal, the method further comprises: controlling the third switch, the fourth switch and the charging switch to be disconnected and the first switch and the second switch to be closed.

[0016] In a third aspect, the present application provides the following technical solutions through an embodiment of the present application.

[0017] A vehicle comprising the boosting charging system of any one of the preceding first aspect and a vehicle body.

[0018] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0019] The boosting charging system provided by the embodiment of the present application, by modifying the structure of the three-phase driving motor, makes the end of the motor winding as the center point of the three-phase driving motor, and connects with the output end of the boosting charging device through the connecting line. The system, on the basis of the existing electric drive, by externally connecting the boosting charging device, simultaneously reuses the motor control and the motor winding to form a boosting charging circuit, realizes the modification of the boosting charging function, leads a single connecting line from the center point of the electric drive three-phase to the boosting charging device, and realizes the function of reducing the ripple and the like while boosting. By leading the center point from the motor to the boosting charging device, the three-phase is completely reused for alternating boosting when the boosting charging state, realizes the common participation of the motor three-phase, reduces the risk of temperature rise and the imbalance of torque, and at the same time, guarantees the performance of the motor when the motor works normally, improves the generality and stability of the vehicle charging. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The first structure schematic diagram of the boosting charging system for the vehicle in the embodiment of the present application;

[0022] Figure 2 The second structure schematic diagram of the boosting charging system for the vehicle in the embodiment of the present application;

[0023] Figure 3 The third structure schematic diagram of the boosting charging system for the vehicle in the embodiment of the present application;

[0024] Figure 4 The fourth structure schematic diagram of the boosting charging system for the vehicle in the embodiment of the present application;

[0025] Figure 5 The structure schematic diagram for the cooling pipeline inlet and outlet in the embodiment of the present application;

[0026] Figure 6 The structure schematic diagram for the cooling pipeline in the embodiment of the present application;

[0027] Figure 7 The flow chart of the boosting charging method for the vehicle in the embodiment of the present application;

[0028] Figure 8 The structure schematic diagram of the vehicle in the embodiment of the present application. DETAILED DESCRIPTION

[0029] The inventor finds that in the conventional motor boost charging, the general idea of the modification scheme of the boost charging is to lead out from any one phase of U / V / W to the boost charging box, and the three-phase winding of the motor is connected in series and parallel to form a large inductance, so as to realize the boost charging of the electric drive. However, in this method, the three-phase bridge arm of the controller can be reused at most for two phases; since the current flowing through the three phases is unbalanced, torque imbalance and thermal imbalance are easy to occur, thereby causing braking influence or temperature rise risk, and it is impossible to realize stable control and avoid the temperature rise risk and torque generation in the charging process.

[0030] Therefore, the embodiment of the present application provides a boost charging system, method and vehicle for a vehicle, which can realize more stable control and better avoid the temperature rise risk and torque generation by using a boost charging structure modification method with less cost, and is beneficial to improve the universality and stability of vehicle charging.

[0031] The technical scheme of the embodiment of the present application is as follows to solve the above technical problems:

[0032] A boost charging system for a vehicle, comprising: a battery pack configured to be electrically connected with a charging pile; a control subsystem comprising a motor controller and a boost charging device, the motor controller being connected with the battery pack, and an input end of the boost charging device being electrically connected with the charging pile; a three-phase driving motor comprising motor windings, a first end of the motor windings being connected with the motor controller, and a last end of the motor windings being connected together as a center point of the three-phase driving motor and being connected with an output end of the boost charging device; control ends of the battery pack, the motor controller and the boost charging device are configured to be electrically connected with a battery management system of the vehicle, and in a charging state, the battery management system is configured to send a charging control signal to the battery pack, the motor controller and the boost charging device according to a voltage provided by the charging pile.

[0033] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings of the specification and specific embodiments.

[0034] In a first aspect, the embodiment of the present application provides a boost charging system for a vehicle, and specifically, as shown in Figure 1 The boost charging system comprises:

[0035] The battery pack 10 is electrically connected with the charging pile; the control subsystem includes a motor controller 201 and a boost charging device 202, the motor controller 201 is connected with the battery pack 10, and the input end of the boost charging device 202 is electrically connected with the charging pile; and the three-phase driving motor 30 includes motor windings 301, the first end of the motor windings 301 is connected with the motor controller 201, the ends of the motor windings 301 are connected in series as the center point of the three-phase driving motor 30, and the output end of the boost charging device 202 is connected with the center point. The control ends of the battery pack, the motor controller and the boost charging device are electrically connected with the battery management system of the vehicle, and in the charging state, the battery management system is used for sending a charging control signal to the battery pack 10, the motor controller 201 and the boost charging device 202 according to the voltage provided by the charging pile.

[0036] As shown in Figure 1 , when the connection mode of the motor windings 301 is star (Y) connection, the ends of the motor windings 301 can be directly connected in series as the center point of the three-phase driving motor 30, and the output end of the boost charging device 202 is connected with the center point. The battery management system of the vehicle is used for sending a charging control signal to the battery pack 10, the motor controller 201 and the boost charging device 202 according to the voltage provided by the charging pile, and if the motor controller 201 receives a boost control signal, the three-phase is multiplexed for alternating boost operation, so that all three-phase bridge arms can be multiplexed.

[0037] In specific embodiments, as shown in Figure 2 , the three-phase driving motor 30 can further include a three-phase contactor KM-△ and a multiplexer KM-Y (for example, a three-way multiplexer), the three-phase contactor KM-△ is connected across the two ends of the motor windings 301, the ends of the motor windings 301 are connected in series through the multiplexer KM-Y, and the output end of the multiplexer KM-Y is connected as the center point of the three-phase driving motor 30 and the output end of the boost charging device 202.

[0038] The motor controller 201 is electrically connected with the three-phase contactor KM-△ and the multiplexer KM-Y, if the charging control signal received by the motor controller 201 is a boost control signal, the three-phase contactor KM-△ is controlled to be opened and the multiplexer KM-Y is controlled to be closed based on the boost control signal, and if the received charging control signal is a normal working signal, the three-phase contactor KM-△ is controlled to be closed and the multiplexer KM-Y is controlled to be opened.

[0039] As shown in Figure 2As shown, the three-phase contactor KM-△ is connected across the two ends of the motor winding 301, which means that the first input end of the three-phase contactor KM-△ is connected to the first end A of the first-phase winding in the motor winding 301, and the first output end of the three-phase contactor KM-△ is connected to the last end Y of the second-phase winding in the motor winding 301; the second input end of the three-phase contactor KM-△ is connected to the first end B of the second-phase winding in the motor winding 301, and the second output end of the three-phase contactor KM-△ is connected to the last end Z of the third-phase winding in the motor winding 301; the third input end of the three-phase contactor KM-△ is connected to the first end C of the third-phase winding in the motor winding 301, and the third output end of the three-phase contactor KM-△ is connected to the last end X of the first-phase winding in the motor winding 301.

[0040] The last ends of the motor winding 301 are connected to the input end of the multiplexer KM-Y, and the output end of the multiplexer KM-Y serves as a center point.

[0041] The connection mode of the motor winding 301 can be a triangle or a star, which is not limited in the present application.

[0042] In actual use of the boost charging system, the battery management system of the vehicle is used to send a charging control signal to the battery pack 10, the motor controller 201 and the boost charging device 202 according to the voltage provided by the charging pile, wherein the charging control signal includes a boost control signal and a normal working signal, the boost control signal is used to control the boost charging system to boost charge the battery pack 10, and the normal working signal is used to control the boost charging system to work normally.

[0043] When the motor winding 301 is connected in a triangle, if the motor controller 201 receives the boost control signal sent by the battery management system of the vehicle, the motor controller 201 controls the three-phase contactor KM-△ to be disconnected and the multiplexer KM-Y to be closed, so that the motor winding 301 is converted from a triangle (△ connection) to a star (Y connection); if the motor controller 201 receives the normal working signal sent by the battery management system of the vehicle, the motor controller 201 controls the three-phase contactor KM-△ to be closed and the multiplexer KM-Y to be disconnected, so that the motor winding 301 is in the original connection mode and normally plays the function of electric drive. When the motor winding 301 is connected in a star, the same control method is adopted, which will not be described here.

[0044] In specific embodiments, as Figure 2As shown, the battery pack 10 can include: a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, and a battery module BAT; the first end of the first switch S1 is connected with the positive electrode of the battery module BAT, the second end of the first switch S1 is connected with the first end of the third switch S3, the second end of the third switch S3 is in communication with the positive electrode of the charging pile, the first end of the second switch S2 is connected with the negative electrode of the battery module BAT, the second end of the second switch S2 is connected with the first end of the fourth switch S4, and the second end of the fourth switch S4 is in communication with the negative electrode of the charging pile.

[0045] Specifically, the second end of the first switch S1 is also used to lead out a connection line as the positive output end of the battery pack 10, and the second end of the second switch S2 is also used to lead out a connection line as the negative output end of the battery pack 10.

[0046] In specific embodiments, as shown, Figure 2 The boost charging module can be independently designed, and can include: a first charging switch S5, a second charging switch S6, a pre-charging capacitor C1, a field effect tube mos, a bleeder resistor R, and a voltage detector V.

[0047] The first end of the first charging switch S5 is in communication with the positive electrode of the charging pile, the first end of the second charging switch S6 is in communication with the negative electrode of the charging pile, the two ends of the pre-charging capacitor C1 are respectively connected with the second end of the first charging switch S5 and the second end of the second charging switch S6, the voltage detector V is connected in parallel with the pre-charging capacitor C1, and the field effect tube mos is connected in series with the bleeder resistor R and then connected in parallel with the pre-charging capacitor C1, and the second end of the first charging switch S5 is also connected with the center point of the three-phase driving motor 30.

[0048] Specifically, the drain of the field effect tube mos is connected with the second end of the first charging switch S5, the source of the field effect tube mos is connected with the first end of the bleeder resistor R, and the second end of the bleeder resistor R is connected with the second end of the second charging switch S6. A single connection line is led out from the three-phase driving motor 30 and connected with the boost charging module, and the power distribution structure in the boost charging module mainly includes a capacitor, a voltage detector V (such as a voltmeter), and a charging switch S5 (such as a relay). The pre-charging capacitor C1, the field effect tube mos, and the resistor constitute a safety protection circuit. After the boost charging is completed, a certain amount of electricity is stored in the pre-charging capacitor C1, which needs to be discharged. At this time, the field effect tube mos is in a closed state, and the electricity stored in the pre-charging capacitor C1 is consumed in the form of heat through the resistor, thereby ensuring the high-voltage safety of the fast-charging boost control box. The voltage detector V is used for boost voltage detection.

[0049] The boost charging module is mainly used for increasing the boost inductance LA, realizing boost voltage detection, reducing ripple, etc. The power distribution structure can delete devices or integrate them in the motor controller 201 according to the vehicle layout requirements and charging power requirements.

[0050] It should be noted that the capacitance of the pre-charge capacitor C1 and the resistance of the discharge resistor R can be set according to specific needs, and the present application is not limited.

[0051] In an alternative embodiment, as shown in Figure 2 The fuse F is connected in series with the second end of the first charging switch S5.

[0052] In a specific embodiment, the motor controller 201 can include an inverter for controlling the boost of the motor controller 201.

[0053] When the boost charging module is independently designed, the motor controller 201 is specifically connected in the following manner: the first end (i.e. the positive input end) of the inverter is connected to the positive output end of the battery pack 10, the second end (i.e. the negative input end) of the inverter is connected to the negative output end of the battery pack 10, and the third end (i.e. the output end) of the inverter is connected to the input end of the motor winding 301.

[0054] In another alternative embodiment, as shown in Figure 3 The boost charging module is integrated with the motor controller 201, and the boost charging module can include a charging switch S5, a pre-charge capacitor C1, a field effect transistor mos, a discharge resistor R, and a voltage detector V.

[0055] The first end of the charging switch S5 is connected to the positive pole of the charging pile, the second end of the charging switch S5 is connected to the first end of the pre-charge capacitor C1, the second end of the pre-charge capacitor C1 is connected to the negative output end of the battery pack 10, the voltage detector V is connected in parallel with the pre-charge capacitor C1, and the field effect transistor mos is connected in series with the discharge resistor R and then connected in parallel with the pre-charge capacitor C1. The second end of the charging switch S5 is also connected to the center point of the three-phase driving motor 30.

[0056] Specifically, the drain of the field effect transistor mos is connected to the second end of the charging switch S5, the source of the field effect transistor mos is connected to the first end of the discharge resistor R, and the second end of the discharge resistor R is connected to the second end of the pre-charge resistor. The pre-charge capacitor C1, the field effect transistor mos, and the resistor constitute a safety protection circuit. After the boost charging is completed, the pre-charge capacitor C1 stores a certain amount of electricity, which needs to be discharged. At this time, the field effect transistor mos is in a closed state, and the electricity stored in the pre-charge capacitor C1 is consumed in the form of heat through the resistor, ensuring the high-voltage safety of the fast-charging boost control box. The voltage detector V is used for boost voltage detection.

[0057] When the boost charging device 202 is integrated into the motor controller 201, a charging switch S5 (such as a contactor) is added to the boost charging device 202, or a charging switch S5 is added to the battery pack 10. When a pre-charge switch S5 is added to the battery pack 10, the pre-charge capacitor C1, the discharge resistor R, and the voltage detector V are all integrated into the motor controller 201. The center point of the motor winding 301 is connected to the boost charging module (i.e., inside the motor controller).

[0058] It should be noted that the capacitance value of the pre-charge capacitor C1 and the resistance value of the discharge resistor R can be set according to specific needs, and this application does not impose any restrictions.

[0059] When the boost charging module and the motor controller 201 are integrated, the motor controller 201 may include a bus capacitor C2 and an inverter. Specifically, the first terminal of the bus capacitor C2 is connected to the positive output terminal of the battery pack 10, and the second terminal of the bus capacitor C2 is connected to the negative output terminal of the battery pack 10. The bus capacitor C2 is used to stabilize the voltage during the boost charging process.

[0060] The first terminal of the inverter is connected to the first terminal of the bus capacitor C2, the second terminal of the inverter is connected to the input terminal of the motor winding 301, and the third terminal of the motor controller 201 is connected to the second terminal of the bus capacitor C2. The first terminal (positive input) of the inverter is connected to the first terminal of the bus capacitor C2, the second terminal (negative input) of the inverter is connected to the second terminal of the bus capacitor C2, and the third terminal (output) of the inverter is connected to the input terminal of the motor winding 301.

[0061] In one alternative embodiment, such as Figure 3 As shown, the boost charging module may also include a fuse F, which is connected in series with the second terminal of the charging switch S5.

[0062] Furthermore, if the boost charging power increases and the motor windings themselves cannot support this boost power, the inductor LA can be increased. For example... Figure 4 As shown, the boost charging device 202 may further include: a first control switch S7, a second control switch S8, and an inductor LA. The first ends of the first control switch S7 and the second control switch S8 are both connected to the output end of the boost charging device 202. The second control switch S8 is connected in series with the inductor LA and then in parallel with the first control switch S7. The second end of the first control switch S7 is connected to the center point of the three-phase drive motor 30.

[0063] When it is not necessary to add inductor LA, the first control switch S7 is closed; when it is necessary to add inductor LA, the second control switch S8 is closed.

[0064] As other alternative embodiments, such asFigure 3 As shown in the figure, the boost charging module further comprises a control switch S7 and an inductor LA. The inductor LA is externally connected between the second end of the charging switch S5 and the first end of the pre-charging capacitor C1. The input end of the inductor LA is provided with the control switch S7. By setting the external inductor LA, the size of the inductor LA can be set more flexibly.

[0065] In this application, the inductor LA can be externally set up in an inductor box or directly integrated in the controller according to the layout space requirement of the whole vehicle, so as to meet the demand of boost charging power. If the boost charging power demand is low and the ripple effect is small, the inductor components in the controller box 50 can be reduced. The remaining pre-charging capacitor C1 and voltage detector V can be selectively set outside the controller box 50 or integrated in the motor controller 201.

[0066] Of course, as another optional embodiment, the inductor LA can be directly connected in series in the boost charging device 202, that is, as shown in the figure, Figure 2 As shown in the figure, the boost charging device 202 further comprises a control switch S7 and an inductor LA. The first end of the inductor LA is connected with the drain of the field effect transistor mos. The second end of the inductor LA is connected with the first end of the control switch S7. The second end of the control switch S7 is used as the output end of the boost charging device 202 and is connected with the center point of the three-phase driving motor 30.

[0067] Further, in order to cool the motor and solve the problem of sharp temperature rise caused by charging and discharging of the inductor LA, the control subsystem can further comprise a controller box 50 and a cooling pipeline. The motor controller 201 and the boost charging module are arranged in the controller box 50.

[0068] As shown in the figure, Figure 5 , 6 As shown in the figure, the cooling pipeline comprises a cooling liquid inlet 501, a cooling liquid outlet 502 and a cooling liquid pipeline 503. The cooling liquid inlet 501 and the cooling liquid outlet 502 are located on the side of the controller box 50. The cooling liquid pipeline 503 is installed inside the box body of the motor controller 201. The cooling liquid inlet 501 and the cooling liquid outlet 502 are connected with the battery cooling circuit of the vehicle. The cooling liquid pipeline 503 is used for cooling the motor controller 201 and the boost charging module. After the boost charging module is integrated in the motor controller 201, the structure of the cooling pipeline can be modified to cool the boost charging module while cooling the controller.

[0069] It should be noted that in the actual design process, whether the cooling pipeline needs to be added in the controller box can be determined according to the thermal simulation calculation result.

[0070] The control method of the boost charging system proposed in this application will be described in detail as follows:

[0071] The battery pipeline system of the vehicle acquires a voltage provided by a current charging pile, and sends a charging control signal to a battery pack, a motor controller and a boost charging device according to the voltage;

[0072] If the charging control signal is a boost control signal, the motor controller controls the three-phase contactor to be disconnected, the multiplexer to be closed, and the third switch to be disconnected, and the first switch, the second switch, the fourth switch and the charging switch to be closed, so that the boost charging loop is closed and the motor winding is star-shaped, and the three-phase bridge arm multiplexing can be maximized.

[0073] If the charging control signal is a normal working signal, the motor controller controls the three-phase contactor to be closed, the multiplexer to be disconnected, and the third switch, the fourth switch and the charging switch to be disconnected, and the first switch and the second switch to be closed, so that the motor winding is connected in a delta shape and can be normally used.

[0074] The three-phase driving motor is modified in structure, so that the three-phase driving motor comprises a motor winding, a three-phase contactor and a multiplexer. The first end of the motor winding is connected to a motor controller. The three-phase contactor is connected across the two ends of the motor winding. The input end of the multiplexer is connected to the last end of the motor winding. The output end of the multiplexer serves as a center point of the three-phase driving motor and is connected to the output end of a boost charging device. In boost control, the three-phase contactor is controlled to be disconnected and the multiplexer is controlled to be closed, so that the motor winding is connected in a star shape. At this time, the motor center point is connected to the boost charging device by a connection line, so that the three-phase multiplexing alternating boost working can be realized, and the risk of temperature rise and torque generation is avoided. In normal working, the three-phase contactor is controlled to be closed and the multiplexer is controlled to be disconnected, so that the motor winding is connected in the original connection mode, and the three-phase driving motor normally plays the function of electric drive. The system can adaptively regulate the connection mode of the motor winding according to whether it is boost charging control, and connect the motor center point to the boost charging device, so that the three-phase is completely multiplexed for alternating boost working in the boost charging state, the ripple is reduced, the temperature rise is reduced, and the universality and stability of vehicle charging are improved.

[0075] In summary, the boost charging system provided by the embodiment of the application can realize the boost charging function modification by externally connecting a boost charging device, multiplexing an inverter and a motor winding of an electric drive to form a boost charging loop on the basis of an existing electric drive. When the boost charging function of the boost charging system is running, the motor three-phase can be collectively used to reduce the risk of temperature rise and torque imbalance, and the performance of the motor can be ensured when the motor is normally working.

[0076] In a second aspect, the embodiment of the application provides a boost charging method for a vehicle. Figure 7As shown, the method comprises steps S101 to S102:

[0077] In step S101, a voltage provided by the charging pile is acquired.

[0078] In step S102, a charging control signal is sent to the battery pack, the motor controller and the boost charging device according to the voltage.

[0079] In an alternative embodiment, after the charging control signal is sent to the battery pack, the motor controller and the boost charging device, the method further comprises:

[0080] If the charging control signal is a boost control signal, the motor controller is controlled to open the three-phase contactor and close the multiplexer; if the charging control signal is a normal working signal, the motor controller is controlled to close the three-phase contactor and open the multiplexer.

[0081] In an alternative embodiment, if the charging control signal is a boost control signal, the method further comprises: controlling the third switch to be open and the first switch, the second switch, the fourth switch and the charging switch to be closed; if the charging control signal is a normal working signal, the method further comprises: controlling the third switch, the fourth switch and the charging switch to be open and the first switch and the second switch to be closed.

[0082] The boost charging method for the vehicle provided by the embodiment of the present application has the same implementation principle and the same technical effects as the aforementioned system embodiment, and for brevity, the part of the method embodiment not mentioned can refer to the corresponding content in the aforementioned system embodiment.

[0083] In a third aspect, based on the same inventive concept, as shown in the method embodiment, the embodiment provides a vehicle 600 comprising the boost charging system 601 according to any one of the aforementioned first aspect and the vehicle body 602. Figure 8

[0084] Since the boost charging system included in the vehicle introduced by the embodiment of the present application has been described in the foregoing, the specific structure and effect principle of the vehicle based on the boost charging system introduced by the embodiment of the present application can be understood by those skilled in the art, and will not be described here. Any vehicle comprising the battery pack fire extinguishing system of the embodiment of the present application belongs to the scope of the present application.

[0085] ​Those skilled in the art will appreciate that embodiments of the present application can be devised for a variety of applications. It is therefore intended that the present application cover all such modifications and variations of the application disclosed herein provided they come within the scope of the appended claims and their equivalents. It is intended to embrace all alternatives, modifications and variations of this application within the scope of the appended claims.

[0086] The present application is described in reference to the drawings using a flowchart and / or a block diagram of the method, apparatus (system) and computer program product according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagram, and combinations of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing device or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0087] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0088] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0089] While the preferred embodiments of the application have been described, additional variations and modifications can be employed by those skilled in the art. Therefore, the appended claims are intended to cover all such modifications and variations as fall within the scope of the present application.

[0090] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A boost charging system for a vehicle, characterized by, The application relates to a battery pack, a control subsystem, a three-phase driving motor and a battery management system. The battery pack is electrically connected with a charging pile; the control subsystem comprises a motor controller connected with the battery pack and a voltage-boosting charging device with an input end electrically connected with the charging pile; the three-phase driving motor comprises motor windings, the first end of the motor windings is connected with the motor controller, the last end of the motor windings is connected as a center point of the three-phase driving motor and is connected with the output end of the voltage-boosting charging device; the control ends of the battery pack, the motor controller and the voltage-boosting charging device are electrically connected with the battery management system of the vehicle, and the battery management system is used for sending charging control signals to the battery pack, the motor controller and the voltage-boosting charging device according to the voltage provided by the charging pile in a charging state; the three-phase driving motor further comprises a three-phase contactor and a multiplexer; the three-phase contactor is connected across the two ends of the motor windings, the last end of the motor windings is connected through the multiplexer, the output end of the multiplexer is connected as the center point of the three-phase driving motor and is connected with the output end of the voltage-boosting charging device; the motor controller is electrically connected with the three-phase contactor and the multiplexer respectively, if the charging control signal received by the motor controller is a voltage-boosting control signal, the three-phase contactor is controlled to be disconnected and the multiplexer is controlled to be closed based on the voltage-boosting control signal, and if the charging control signal received is a normal working signal, the three-phase contactor is controlled to be closed and the multiplexer is controlled to be disconnected. The voltage-boosting charging device comprises a first charging switch, a second charging switch, a pre-charging capacitor, a field effect tube, a bleeder resistor and a voltage detector; the first end of the first charging switch is in communication with the positive pole of the charging pile, the first end of the second charging switch is in communication with the negative pole of the charging pile, the two ends of the pre-charging capacitor are connected with the second end of the first charging switch and the second end of the second charging switch respectively, the voltage detector is connected in parallel with the pre-charging capacitor, and the field effect tube and the bleeder resistor are connected in series and then connected in parallel with the pre-charging capacitor; the second end of the first charging switch is further connected with the center point of the three-phase driving motor. The voltage-boosting charging device comprises a charging switch, a pre-charging capacitor, a field effect tube, a bleeder resistor and a voltage detector; the first end of the charging switch is in communication with the positive pole of the charging pile, the second end of the charging switch is connected with the first end of the pre-charging capacitor, the second end of the pre-charging capacitor is connected with the negative output end of the battery pack, the voltage detector is connected in parallel with the pre-charging capacitor, and the field effect tube and the bleeder resistor are connected in series and then connected in parallel with the pre-charging capacitor; the second end of the charging switch is further connected with the center point of the three-phase driving motor. The voltage-boosting charging device further comprises a first control switch, a second control switch and an inductor. ​ 2. A boost charging system for a vehicle as defined in claim 1, wherein, ​ ​ 3. A boost charging system for a vehicle as defined in claim 1, wherein ​ ​ 4. A boost charging system for a vehicle as claimed in claim 2 or 3, wherein ​ The first end of the first control switch and the second control switch is connected with the output end of the boost charging device, the second control switch is connected with the inductor in series and then connected with the first control switch in parallel, and the second end of the first control switch is connected with the center point of the three-phase driving motor.

5. A boost charging system for a vehicle as defined in claim 1, wherein The battery pack comprises a first switch, a second switch, a third switch, a fourth switch and a battery module. The first end of the first switch is connected with the positive electrode of the battery module, the second end of the first switch is connected with the first end of the third switch, the second end of the third switch is connected in communication with the positive electrode of the charging pile, the first end of the second switch is connected with the negative electrode of the battery module, the second end of the second switch is connected with the first end of the fourth switch, and the second end of the fourth switch is connected in communication with the negative electrode of the charging pile.

6. A boost charging method for a vehicle, characterized by, The battery management system applied to the boost charging system in any one of claims 1-5, the method comprises: obtaining the voltage provided by the charging pile; According to the voltage, the charging control signal is sent to the battery pack, the motor controller and the boost charging device; After the charging control signal is sent to the battery pack, the motor controller and the boost charging device, if the charging control signal is a boost control signal, the three-phase contactor is controlled to be opened and the multiplexer is controlled to be closed by the motor controller; if the charging control signal is a normal working signal, the three-phase contactor is controlled to be closed and the multiplexer is controlled to be opened by the motor controller.

7. The boost charging method for a vehicle according to claim 6, wherein If the charging control signal is a boost control signal, the method further comprises: controlling the third switch to be opened, and the first switch, the second switch, the fourth switch and the charging switch to be closed. If the charging control signal is a normal working signal, the method further comprises: controlling the third switch, the fourth switch and the charging switch to be opened, and the first switch and the second switch to be closed.

8. A vehicle characterized by comprising: The boost charging system for vehicle and the vehicle body comprising the boost charging system for vehicle in any one of claims 1-5.

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