WO2024022510A1

WO2024022510A1 - Charging system and vehicle

Info

Publication number: WO2024022510A1
Application number: PCT/CN2023/109914
Authority: WO
Inventors: 凌和平; 闫磊; 常东博; 袁帅; 李申
Original assignee: 比亚迪股份有限公司
Priority date: 2022-07-29
Filing date: 2023-07-28
Publication date: 2024-02-01
Also published as: CN218633424U

Abstract

A charging system and a vehicle, relating to the technical field of charging. The charging system comprises: M charging ports, wherein a first end of each charging port is connected to a charging device, and M is an integer greater than 1; a buck-boost circuit, wherein a second end of each charging port is connected to a first end of the buck-boost circuit; a battery pack connected to a second end of the buck-boost circuit; and a controller connected to a control end of the buck-boost circuit and configured to: acquire charging demand information of the battery pack and output capability information of a charging device corresponding to each charging port, and control the buck-boost circuit according to the charging demand information and the output capability information so as to perform multi-gun charging.

Description

Charging systems and vehicles

Cross-references to related applications

This disclosure claims priority from the Chinese patent application with application number 202222000885.8 and titled "Charging System and Vehicle" filed on July 29, 2022, the entire content of which is incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the field of charging technology, and in particular to a charging system and a vehicle.

Background technique

With the rapid development of new energy vehicles, the battery pack capacity of electric vehicles is getting higher and higher, and the driving range is getting longer and longer. Correspondingly, the charging speed of electric vehicles has become an issue of increasing concern. However, the charging system in the related art has a technical problem of low charging rate.

Contents of the invention

A charging system and vehicle are compatible with charging equipment of different maximum output voltage platforms for fast charging, thereby improving charging efficiency and shortening charging time.

In a first aspect, the present disclosure proposes a charging system. The charging system includes: M charging ports. The first end of each charging port is connected to a charging device, where M is an integer greater than 1; lift a voltage circuit, the second end of each charging port is connected to the first end of the step-up and step-down circuit; a battery pack, the battery pack is connected to the second end of the step-up and step-down circuit; the controller, The controller is connected to the control end of the buck-boost circuit, and the controller is configured to: obtain the charging demand information of the battery pack and the output capability information of the charging equipment corresponding to each of the charging ports, and The buck-boost circuit is controlled according to the charging demand information and the output capability information to perform multi-gun charging.

The disclosed charging system, through the setting of the voltage-boosting and bucking circuits, can control the voltage-boosting and bucking circuits for multi-gun charging according to the output capabilities of the charging equipment connected to the M charging ports, thereby being compatible with different maximum output voltages. The platform's charging equipment allows for fast charging, which can improve charging efficiency and shorten charging time.

In a second aspect, the present disclosure provides a vehicle including the above charging system.

Through the above charging system, the vehicle of the present disclosure can be compatible with charging equipment of different maximum output voltage platforms to facilitate rapid charging, thereby improving charging efficiency and shortening charging time.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

Figure 1 is a schematic structural diagram of a charging system according to an embodiment of the present disclosure;

Figure 2 is a schematic structural diagram of a buck-boost circuit according to the first specific embodiment of the present disclosure;

Figure 3 is a schematic structural diagram of a charging system according to a second specific embodiment of the present disclosure;

Figure 4 is a schematic structural diagram of a charging system according to a third specific embodiment of the present disclosure;

Figure 5 is a schematic structural diagram of a charging system according to a fourth specific embodiment of the present disclosure;

Figure 6 is a schematic structural diagram of a charging system according to a fifth specific embodiment of the present disclosure;

Figure 7 is a schematic structural diagram of a charging system according to a sixth specific embodiment of the present disclosure;

Figure 8 is a schematic diagram of working stage 1 of the charging system according to an embodiment of the present disclosure;

Figure 9 is a schematic diagram of the second working stage of the charging system according to an embodiment of the present disclosure;

Figure 10 is a schematic diagram of working stage 1 of the charging system according to another embodiment of the present disclosure;

Figure 11 is a schematic diagram of working stage 2 of the charging system according to another embodiment of the present disclosure;

Figure 12 is a working flow chart of a charging system according to a specific embodiment of the present disclosure;

FIG. 13 is a structural block diagram of a vehicle according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present disclosure and are not to be construed as limitations of the present disclosure.

The charging system and vehicle according to embodiments of the present disclosure will be described below with reference to the accompanying drawings.

Figure 1 is a schematic structural diagram of a charging system according to an embodiment of the present disclosure.

As shown in Figure 1, the charging system of the embodiment of the present disclosure includes: M charging ports (Figure 1 takes M=2 as an example, and the two charging ports are marked as the first charging port 1 and the second charging port 2 respectively), The voltage-boost and buck circuit 3, the controller 4 and the battery pack 5, where M is an integer greater than 1. The first end of each charging port is connected to the charging equipment, and the second end of each charging port is connected to the first end of the buck-boost circuit 3; the battery pack 5 is connected to the second end of the buck-boost circuit 3; the controller 4 is connected to the control end of the buck-boost circuit 3, and the controller 4 is configured to: obtain the charging demand information of the battery pack 5 and the output capability information of the charging equipment corresponding to each charging port, and according to the charging demand information and output capability The information controls the buck-boost circuit 3 for multi-gun charging.

Specifically, M charging ports are used to connect M charging guns, and the M charging guns can respectively belong to N different charging devices, where N≤M. When the battery pack 5 is charged through M charging ports, the M charging ports are connected to N charging devices through M charging guns. At this time, the controller 4 can obtain the charging demand information of the battery pack 5 (such as the charging demand voltage), and obtain the output capability information of the N charging devices (such as the highest output voltage, the highest output current, etc.), and according to the charging demand information and output The capability information determines the charging control mode (such as single-gun fully open mode, single-gun boost mode, double-gun fully open mode, double-gun boost mode, etc.), and controls the boost and buck circuit 3 according to the charging control mode (such as full-gun boost mode). open control, boost and buck control, etc.).

Therefore, the charging system of the embodiment of the present disclosure is compatible with charging equipment with different maximum output voltage platforms. Regardless of whether the charging voltage range of the charging equipment connected to the charging port is lower than or higher than the maximum allowable charging voltage of the battery pack 5, it can be used. The corresponding charging mode realizes rapid charging of the battery pack 5, thereby improving the charging efficiency and shortening the charging time.

Figure 2 is a schematic structural diagram of a charging system according to a first specific embodiment of the present disclosure.

As shown in Figure 2, in some embodiments of the present disclosure, the buck-boost circuit 3 includes: N-phase bridge arms, N first inductors L1 and first capacitors C1, where N is a positive integer (N=1 in Figure 2 As shown in the example), N bridge arms correspond to N first inductors L1 one-to-one.

Referring to Figure 2, each phase bridge arm is connected in parallel with the first capacitor C1. The N-phase bridge arms are connected in parallel. The first bus terminal after the N-phase bridge arms are connected in parallel is connected to the positive electrode of the battery pack 5. The N-phase bridge arms are connected in parallel. The second bus terminal is connected to the negative electrode of the battery pack 5, where N is a positive integer. The N first inductors L1 are in one-to-one correspondence with the N-phase bridge arms. The first end of each first inductor L1 is connected to the midpoint of the corresponding bridge arm. The second end of each first inductor L1 is connected to the center point of each charging port. The positive pole is connected, and the negative pole of each charging port is connected to the second bus terminal.

As an example, each phase bridge arm includes a first switch component and a second switch component, and the first switch component and the second switch component are connected in series. Referring to Figure 2, the first switch component includes a first switch tube VT1 and a first diode VD1. The second switch component includes a second switch tube VT2 and a second diode VD2. The first diode VD1 and the first switch The tube VT1 is connected in parallel, and the second diode VD2 is connected in parallel with the second switching tube VT2. The midpoint of each phase bridge arm is the connection point between the corresponding first switching tube VT1 and the second switching tube VT2.

In this embodiment, the controller 4 is connected to the control terminals of the first switching tube VT1 and the second switching tube VT2, and is used to perform on-off control of the first switching tube VT1 and the second switching tube VT2. As a result, through the on-off control of each switch tube of the N-phase bridge arm, the full-on, boost or step-down control of 3 of the step-up and step-down circuit is realized to adapt to different charging needs.

In some embodiments of the present disclosure, referring to Fig. 2, the charging system may also include M switch circuits (Fig. 2 shows M=2 as an example, and the two switch circuits are marked as the first switch circuit 61 and the second switch circuit respectively. 62) and the second capacitor C2. M switch circuits correspond to M charging ports one-to-one, and the switch circuits are connected between the buck-boost circuit 3 and the corresponding charging ports; the second capacitor C2 is connected between the second end of the first inductor L1 and the second bus terminal. time, it is configured to filter and stabilize the charging voltage input from each charging port. In this embodiment, the controller 4 is also connected to the control terminals of the M switch circuits for controlling the opening or closing of the M switch circuits.

Specifically, referring to Figure 2, taking the value of M as 2 as an example, the first switch circuit 61 corresponding to the first charging port 1 includes a contactor K4 and a contactor K7, and the second switch corresponding to the second charging port 2 Circuit 61 includes contactor K5 and contactor K8. Among them, when the battery pack 5 needs to be charged through the first charging port 1, the controller 4 needs to control K4 and K7 to close; when the battery pack 5 needs to be charged through the second charging port 1, the controller 4 needs to control K5 and K8 closure. At the same time, the controller 4 can also perform on-off control of VT1 and VT2 as needed to realize the step-up and step-down charging of the battery pack 5.

As an example, referring to FIG. 2 , the charging system may also include a main positive contactor K2 and a precharge circuit 7 . The main positive contactor K2 is connected between the positive electrode of the battery pack 5 and the first bus terminal; the precharging circuit 7 includes a precharging contactor K3 and a precharging resistor R connected in series, and the precharging circuit is connected in parallel with the main positive contactor K2. Optionally, referring to Figure 2, the charging system may also include The main negative contactor K1 is connected between the negative electrode of the battery pack 5 and the second bus terminal.

FIG. 3 is a schematic structural diagram of the charging system according to the second specific embodiment of the present disclosure. FIG. 4 is a schematic structural diagram of the charging system according to the third specific embodiment of the present disclosure.

As shown in Figures 3 and 4, the charging system also includes: a second inductor L2. The second inductor L2 is connected between the first inductor L1 and the positive electrode of the target charging port, where the target charging port is any of the M charging ports. one. When the target charging port is the first charging port 1, see FIG. 3, the second inductor L2 is connected between the first inductor L1 and the positive electrode of the first charging port 1. When the target charging port is the second charging port 2, see FIG. 4, the second inductor L2 is connected between the first inductor L1 and the positive electrode of the second charging port 2.

Therefore, by providing the second inductor L2, it is possible to suppress the possible circulating current between the two charging devices connected to the two charging ports when the maximum output current is reached at the same time.

In some embodiments of the present disclosure, the charging system is used in a vehicle, the N-phase bridge arm multiplexes the N-phase control bridge arm in the motor controller of the vehicle, and the N first inductors L1 multiplex N motor coil inductors of the vehicle. Therefore, new devices can be reduced, hardware costs can be reduced, and the layout design of the buck-boost circuit 3 can be facilitated.

Figure 5 is a schematic structural diagram of a charging system according to a fourth specific embodiment of the present disclosure.

As shown in Figure 5, when N is equal to 3, the three-phase bridge arms are recorded as the first bridge arm, the second bridge arm and the third bridge arm respectively. The first bridge arm consists of the switch tube VT1, the switch tube VT2, the diode VD1 and the diode It is composed of VD2, the second bridge arm is composed of switch tube VT3, switch tube VT4, diode VD3 and diode VD4, and the third bridge arm is composed of switch tube VT5, switch tube VT6, diode VD5 and diode VD6. At the same time, referring to Figure 5, the three inductors connected to the three-phase bridge arms can reuse the three motor coil inductors L3. As a result, the charging system can reduce the use of devices by reusing motor electronic control components, thereby reducing costs and reducing the space occupied by the charging system.

Optionally, referring to Figure 5, the charging system also includes a switch (contactor K6 in Figure 5) connected between the N motor coil inductors L3 and the positive poles of the M charging ports. At the same time, the second capacitor C2 is connected Between the end of contactor K6 away from L3 and the second bus end. Among them, the controller 4 can also be connected to the control end of the contactor K6 to control the on and off of the contactor K6. Through the setting of contactor K6, the motor electronic control components can be reused in the charging system without affecting the normal drive control of the motor electronic control components. Specifically, when the vehicle is running normally, K6 is disconnected, and the motor coil inductor L3 and the 3-phase bridge arm are used for drive control; when the vehicle stops charging, K6 is closed to realize charging of the charging system.

FIG. 6 is a schematic structural diagram of a charging system according to a fifth specific embodiment of the present disclosure, and FIG. 7 is a schematic structural diagram of a charging system according to a sixth specific embodiment of the present disclosure.

Among them, the difference between Figure 6 and Figure 3, and the difference between Figure 7 and Figure 4 are all in the different structures of the buck-boost circuit 3, and the structure of the different buck-boost circuit 3 adopts the buck-boost circuit 3 shown in Figure 5. Structure. As shown in Figures 3 and 4, Figures 6 and 7, by setting the second inductor L2, it is possible to suppress the possible circulating current between the two charging devices connected to the two charging ports when the maximum output current is at the same time.

In some embodiments of the present disclosure, the charging demand information includes a demand charging voltage, the output capability information includes a maximum output voltage and a maximum output current, and the controller 4 is further configured to:

When the maximum output voltage of the charging equipment corresponding to each charging port is greater than or equal to the required charging voltage, the M switch circuits are controlled to be closed, and the voltage-boosting and bucking circuit 3 is controlled to be fully open;

When the maximum output voltage of charging corresponding to each charging port is less than the required charging voltage, the M switch circuits are controlled to be closed, and the voltage boosting and bucking circuit 3 is controlled to boost;

Otherwise (that is, the maximum output voltage of the charging equipment corresponding to at least one charging port is greater than or equal to the demand charging voltage, and the maximum output voltage of charging corresponding to at least one charging port is less than the demand charging voltage), according to the demand charging voltage, the maximum output voltage and the maximum The output current controls the opening or closing of M switch circuits and controls the voltage-boosting and bucking circuits 3 .

In a specific embodiment, the charging device connected to the first charging port 1 is referred to as the first charging device, and the charging device connected to the second charging port 2 is referred to as the second charging device. The output capability information of the first charging device includes The first highest output voltage U1 and the first highest output current I1, the capability information of the second charging device includes the second highest output voltage U2 and the second highest output current I2, and the required charging voltage is U0.

In this embodiment, as an example, the controller 4 is further configured to:

When the first highest output voltage of the first charging device is greater than or equal to the demand charging voltage, and the second highest output voltage of the second charging device is less than the demand charging voltage, that is, U1≥U0, U2<U0, according to the demand charging voltage, the first The first charging power P1 is calculated from the first highest output current of the charging device, such as P1=U0*I1, and based on the first highest output current of the first charging device, the second highest output voltage of the second charging device and the second highest The output current is calculated to obtain the second charging power P2, such as P2=U2*(I1+I2); when the first charging power is greater than the second charging power, that is, P1>P2, the switch circuit corresponding to the first charging port 1 is controlled to close, The switch circuit corresponding to the second charging port 2 is turned off, and the boost and buck circuit 3 is fully open; when the first charging power is less than or equal to the second charging power, that is, P1 ≤ P2, the first charging port 1, The switch circuits corresponding to the second charging port 2 are all closed, and the voltage boosting and bucking circuit 3 is controlled to boost the voltage.

As another example, Controller 4 is also configured to:

When the first highest output voltage of the first charging device is less than the required charging voltage and the second highest output voltage of the second charging device is greater than or equal to the required charging voltage, that is, U1 < U0 and U2 ≥ U0, according to the first charging device The third charging power P3 is calculated from the highest output voltage, the first highest output current and the second highest output current of the second charging device, such as P3=U1*(I1+I2), and according to the required charging voltage, the second charging device The highest output current is calculated to obtain the fourth charging power P4, such as P4=U0*I2; when the third charging power is less than or equal to the fourth charging power, that is, P3≤P4, the switch circuit corresponding to the first charging port 1 is controlled to be disconnected , the switch circuit corresponding to the second charging port 2 is closed, and the voltage-boosting and bucking circuit 3 is fully open; when the third charging power > the fourth charging power, that is, P3 > P4, the first charging port 1 and the second charging port 2 are controlled. The switch circuits corresponding to the charging port 2 are all closed, and the voltage boosting and bucking circuit 3 is controlled to increase the voltage.

Specifically, the first charging equipment fully opens to control the charging power and the dual-gun simultaneous boosting controls the charging power judgment process:

The first charging power P1=U0*I1, the second charging power P2=U2*(I1+I2), if P1>P2, then it is determined that the charging control mode is full-on control of the first charging device and no charging of the second charging device; If P1≤P2, the charging control mode is determined to be simultaneous voltage boost control of the first charging device and the second charging device.

The second charging device is fully open to control the charging power and the dual-gun simultaneous boost control charging power judgment process:

The third charging power P3==U1*(I1+I2), the fourth charging power P4=U0*I2, if P3≤P4, it is determined that the charging control mode is the second charging equipment full-open control and the first charging equipment does not charge. ; If P3>P4, it is determined that the charging control mode is simultaneous voltage boost control of the first charging device and the second charging device.

Optionally, when the charging equipment and the vehicle charge handshake, the charging equipment can obtain the charging demand voltage of the power battery; when the charging demand voltage > the maximum output voltage Umax of the charging equipment, the voltage step-down operation is performed by controlling the voltage-boosting and bucking circuit, so that The voltage of the charging port is below the maximum output voltage of the charging device.

Next, with reference to Figures 8 to 11, the working principle of the charging system of the embodiment of the present disclosure will be explained by taking the charging voltage range of one of the two charging devices to be lower than the maximum allowable charging voltage of the battery pack 5 and simultaneous boost charging of the two guns as an example:

FIG. 8 is a schematic diagram of the working stage 1 of the charging system according to an embodiment of the present disclosure. FIG. 9 is a schematic diagram of the working stage 2 of the charging system according to an embodiment of the present disclosure.

As shown in Figure 8, in the first stage of the charging process, the control switch VT2 is turned on, and the first charging circuit and the second charging circuit charge the inductor L1 at the same time. The current flow direction of the first charging circuit is: the positive electrode of the first charging port 1 → Contactor K7 → First inductor L1 → Switching tube VT2 → Contactor K4 → Negative pole of first charging port 1, the current flow direction of the second charging circuit is: Positive pole of second charging port 2 → Contactor K8 → Inductor L1 → Switching tube VT2 → Contactor K5 → Negative pole of second charging port 2.

As shown in Figure 9, in the second stage of the charging process, the control switch VT2 is turned off, and the first charging circuit and the second charging circuit simultaneously superimpose the voltage of the inductor L1 to charge the battery pack 5. The current flow direction of the first charging circuit is: The positive pole of the first charging port 1 → contactor K7 → inductor L1 → diode VD1 → contactor K2 → battery pack 5 → contactor K1 → contactor K4 → the negative pole of the first charging port 1, the current flow direction of the second charging circuit is: second Positive electrode of charging port 2 → contactor K8 → inductor L1 → diode VD1 → contactor K2 → battery pack 5 → contactor K1 → contactor K5 → negative electrode of second charging port 2.

Therefore, through the alternating control of stage one and stage two, boost conversion can be achieved, thereby achieving simultaneous boost charging of both guns.

It should be noted that when the charging control mode is fully open control, the switch tube VT2 is not controlled to be turned on and off for boost conversion. The current flows directly through the diode VD1 to charge the battery pack 5. The current flow direction of the two guns charging at the same time is the same as Figure 9 shows the same.

FIG. 10 is a schematic diagram of the working stage 1 of the charging system according to another embodiment of the present disclosure. FIG. 11 is a schematic diagram of the working stage 2 of the charging system according to another embodiment of the present disclosure.

As shown in Figure 10, in the first stage of the charging process, the control switch tubes VT2, VT4, and VT6 are turned on, and the first charging circuit and the second charging circuit charge the motor coil inductor L3 at the same time. The current flow direction of the first charging circuit is: Positive pole of first charging port 1 → contactor K7 → switch K6 → motor coil inductor L3 → switching tubes VT2, VT4, VT6 → contactor K4 → negative pole of first charging port 1, the current flow direction of the second charging circuit is: second charging Positive pole of port 2 → contactor K8 → switch K6 → inductor L3 → switch tubes VT2, VT4, VT6 → contactor K5 → negative pole of second charging port 2.

As shown in Figure 11, in the second stage of the charging process, the control switch tubes VT2, VT4, and VT6 are disconnected, and the first charging circuit and the second charging circuit simultaneously superimpose the voltage of the motor coil inductor L3 to charge the battery pack 5. The current flow direction of the charging circuit is: positive pole of first charging port 1 → contactor K7 → switch K6 → motor coil inductor L3 → diode VD1, VD3, VD5 → contactor K2 → battery pack 5 → contactor K1 → contactor K4 → negative pole of first charging port 1, the current flow direction of the second charging circuit is: positive pole of second charging port 2 → contactor K8 → switch K6 → Motor coil inductance L3 → diodes VD1, VD3, VD5 → contactor K2 → battery pack 5 → contactor K1 → contactor K5 → negative pole of second charging port 2.

It should be noted that when the charging control mode is fully open control, there is no need to control the switching tubes VT2, VT4, and VT6 to turn on and off for boost conversion. The current flows directly through the diodes VD1, VD3, and VD5 to charge the battery pack 5. The current flow direction when two guns are charged simultaneously is consistent with that shown in Figure 11.

The working flow of the charging system according to the embodiment of the present disclosure is described below with reference to Figure 12:

Figure 12 is a working flow chart of a charging system according to a specific embodiment of the present disclosure.

In this embodiment, the charging gun connected to the first charging port 1 is the first charging gun, and the charging gun connected to the second charging port 2 is the second charging gun, and the first charging gun and the second charging gun belong to to the first charging device and the second charging device. Referring to Figure 12, the workflow of the charging system includes:

S1, detect whether the first charging port is connected to the first charging gun, if so, execute S2, otherwise continue to detect;

S2, perform charging handshake confirmation with the first charging device, and obtain the highest output voltage of the first charging device;

S3, determine whether the maximum output voltage of the first charging device is higher than the maximum allowable charging voltage of the battery pack, if so, execute S4, otherwise execute S5;

S4, full control of the first charging device, transfer to S6;

S5, the first charging equipment boost control, go to S13;

S6, detect whether the second charging port is connected to the second charging gun, if so, execute S7, otherwise continue the detection;

S7, perform charging handshake confirmation with the second charging device, and obtain the highest output voltage of the second charging device;

S8, determine whether the maximum output voltage of the second charging device is higher than the maximum allowable charging voltage of the battery pack, if so, execute S9, otherwise execute S10;

S9, the first charging device and the second charging device are fully controlled at the same time;

S10, determine whether the full-open control charging power of the first charging device is greater than the dual-gun boost control charging power. If so, execute S11, otherwise execute S12;

S11, the first charging device is fully open and the second charging device is not charging;

S12, simultaneous voltage boost control of the first charging device and the second charging device;

S13, detect whether the second charging port is connected to the second charging gun, if so, execute S14, otherwise continue the detection;

S14, perform charging handshake confirmation with the second charging device, and obtain the highest output voltage of the second charging device;

S15, determine whether the maximum output voltage of the second charging device is higher than the maximum allowable charging voltage of the battery pack, if so, execute S16, otherwise execute S12;

S16, determine whether the full-open control charging power of the second charging device is greater than the dual-gun boost control charging power. If so, execute S17, otherwise execute S12;

S17, the first charging device is not charging, and the second charging device is fully controlled.

In summary, the charging system of the embodiment of the present disclosure can select different charging control modes according to the output capabilities of multiple charging devices through the setting of the voltage boosting and bucking circuits, thereby being compatible with charging devices with different output voltage platforms for simultaneous rapid charging of multiple guns. , and at the same time, you can choose the most efficient way to charge, which helps to improve charging efficiency and shorten charging time.

As shown in FIG. 13 , vehicle 100 includes the charging system 10 of the above example.

The vehicle in the embodiment of the present disclosure, through the charging system of the above embodiment, can be compatible with charging equipment with different output voltage platforms for rapid charging with multiple guns at the same time. At the same time, the vehicle with the highest charging efficiency can be selected for charging, which helps to improve charging efficiency and shorten the charging time. Charging time.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered to be a sequenced list of executable instructions for implementing logical functions, which may be embodied in any computer. in a readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can retrieve and execute instructions from the instruction execution system, apparatus, or device) Used by instruction execution systems, devices or equipment. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wires (electronic device), portable computer disk cartridges (magnetic device), random access memory (RAM), Read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium on which the program may be printed, as the program may be printed, for example, by optical scanning of the paper or other medium, followed by editing, interpretation, or in other suitable manner if necessary Processing to obtain a program electronically and then store it in computer memory.

It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware, or combinations thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if it is implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: a logic gate circuit with a logic gate circuit for implementing a logic function on a data signal. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials, or features are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present disclosure, it should be understood that the terms "center", "longitudinal direction", "transverse direction", "length", "Width", "Thickness", "Top", "Bottom", "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom""Inside"","outside","clockwise","counterclockwise","axial","radial","circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only It is intended to facilitate the description of the present disclosure and simplify the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present disclosure.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this disclosure, unless otherwise explicitly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified limitations. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

In this disclosure, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features may be in indirect contact through an intermediary. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present disclosure. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A charging system, characterized in that the charging system includes:

M charging ports, the first end of each charging port is connected to the charging device, where M is an integer greater than 1;

A voltage-boost and buck-boost circuit, the second end of each charging port is connected to the first terminal of the voltage-boost and buck-boost circuit;

A battery pack, the battery pack is connected to the second end of the buck-boost circuit;

A controller, the controller is connected to the control end of the buck-boost circuit, and the controller is configured to: obtain the charging demand information of the battery pack and the output of the charging device corresponding to each of the charging ports. capability information, and control the buck-boost circuit according to the charging demand information and the output capability information to perform multi-gun charging.
The charging system according to claim 1, wherein the voltage boosting and bucking circuit includes:

first capacitor;

N-phase bridge arms, the bridge arms of each phase are connected in parallel with the first capacitor, the N-phase bridge arms are connected in parallel, and the first bus terminal of the N-phase bridge arms in parallel is connected with the positive electrode of the battery pack Connect, the second bus end of the parallel connection of the N-phase bridge arms is connected to the negative electrode of the battery pack, where N is a positive integer;

N first inductors, the N first inductors correspond to the N-phase bridge arms one-to-one, the first end of each first inductor is connected to the midpoint of the corresponding bridge arm, and each first The second end of the inductor is connected to the positive electrode of each charging port, and the negative electrode of each charging port is connected to the second bus terminal.
The charging system of claim 2, wherein each phase bridge arm includes a first switch component and a second switch component, and the first switch component and the second switch component are connected in series;

The first switch component includes a first switch tube and a first diode, and the first diode is connected in parallel with the first switch tube;

The second switch component includes a second switch tube and a second diode, and the second diode is connected in parallel with the second switch tube;

The controller is connected to the control terminals of the first switch tube and the second switch tube, and is used to perform on-off control of the first switch tube and the second switch tube.
The charging system of claim 2, wherein the charging system further includes M switch circuits, the M switch circuits correspond to the M charging ports one by one, and the switch circuits are connected to the M charging ports. Between the buck-boost circuit and the corresponding charging port;

The second capacitor is connected between the second terminal of the first inductor and the second bus terminal; wherein the controller is also connected to the control terminals of the M switching circuits for controlling the M switching circuits. controlled by a switching circuit.
The charging system of claim 2, wherein the charging system further includes:

A main positive contactor, connected between the positive electrode of the battery pack and the first bus terminal;

The precharging circuit includes a precharging contactor and a precharging resistor connected in series, and the precharging circuit is connected in parallel with the main positive contactor.
The charging system of claim 2, wherein the N-phase bridge arm multiplexes an N-phase control bridge arm in a motor controller of the vehicle; and the N first inductors multiplex N first inductors of the vehicle. Motor coil inductance.
The charging system of claim 2, wherein the charging system further includes:

A second inductor is connected between the first inductor and the positive electrode of the target charging port, where the target charging port is any one of the M charging ports.
The charging system of claim 4, wherein the charging demand information includes a required charging voltage, and the output capability information includes a maximum output voltage and a maximum output current;

The controller is also configured to: when the highest output voltage of the charging equipment corresponding to each charging port is greater than or equal to the required charging voltage, control the M switch circuits to close, and perform the voltage boosting and bucking circuit operation. Fully open control;

When the maximum output voltage of charging corresponding to each charging port is less than the required charging voltage, the M switch circuits are controlled to be closed, and the voltage boosting and bucking circuits are controlled to boost;

Otherwise, the M switch circuits are controlled to be opened or closed according to the required charging voltage, the highest output voltage and the highest output current, and the voltage boosting and bucking circuits are controlled.
The charging system of claim 8, wherein the M charging ports include a first charging port and a second charging port, the charging device includes a first charging device and a second charging device, and the first The charging port corresponds to the first charging device, the second charging port corresponds to the second charging device, the output capability information of the first charging device includes the first highest output voltage U1 and the first highest output current I1, and the second charging port The capability information of the device includes the second highest output voltage U2 and the second highest output current I2, and the required charging voltage is U0;

The controller is also configured to:

When U1≥U0, U2<U0, and the first charging power P1>the second charging power P2, control the switch circuit corresponding to the first charging port to close and the switch circuit corresponding to the second charging port to open, and Perform full-on control of the buck-boost circuit, where P1=U0*I1, P2=U2*(I1+I2);

When U1≥U0, U2<U0, and the first charging power P1≤the second charging power P2, the switch circuits corresponding to the first charging port and the second charging port are controlled to be closed, and the lift is controlled. voltage circuit for boost control.
The charging system of claim 9, wherein the controller is further configured to:

When U1<U0, U2≥U0, and the third charging power P3≤the fourth charging power P4, control the switch circuit corresponding to the first charging port to open, the switch circuit corresponding to the second charging port to close, and The step-up and step-down circuit is fully open controlled, where P3=U1*(I1+I2) and P4=U0*I2;

When U1<U0, U2≥U0, and the third charging power P1>the fourth charging power P4, the switch circuits corresponding to the first charging port and the second charging port are controlled to be closed, and the lift is controlled. voltage circuit for boost control.
A vehicle, characterized by comprising the charging system according to any one of claims 1-10.