Charging control circuit, control method thereof and electric vehicle

Abstract

The invention discloses a charging control circuit, a control method thereof and an electric automobile, and relates to the technical field of charging control, the charging control circuit comprises a mode switching module, a high-voltage battery pack and an integrated control module which are connected in sequence, and the integrated control module comprises a power unit and a switch unit. The power unit is respectively connected with the mode switching module, the high-voltage battery pack and the motor, and the switch unit is respectively connected with the mode switching module and the motor; the mode switching module is used for switching a charging mode and switching on a charging loop corresponding to the target charging mode in the target charging mode, so that the charging pile charges the high-voltage battery pack in different modes; wherein the charging mode comprises at least two of a boost charging mode, a direct current fast charging mode and a current-up charging mode. The charging speed is increased, the circuit applicability is improved, and the development difficulty and cost of the whole vehicle are saved.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a charging control circuit and a control method thereof, and an electric vehicle. Background Art

[0002] Due to the influence of many factors such as DC charging speed and the matching of vehicle power / voltage, many models cannot maximize the use of the power of the charging pile to achieve fast charging. In the related technology, there is a solution to increase the charging speed by boosting the voltage or performing high-power direct charging. The problem with this solution is that it can only achieve a single charging method and does not support other charging methods. Therefore, this single solution cannot take into account different usage scenarios and has the problem of low applicability. Summary of the invention

[0003] The main purpose of this application is to provide a charging control circuit and a control method thereof, and an electric vehicle, aiming to solve the technical problem that the fast charging solution in the related technology has limited usage scenarios and low applicability, resulting in the inability to truly maximize the power of the charging pile.

[0004] To achieve the above-mentioned purpose, the present application proposes a charging control circuit suitable for connecting to a charging pile, the charging control circuit comprising a mode switching module, a high-voltage battery pack and an integrated control module connected in sequence, wherein the integrated control module comprises a power unit and a switch unit, the power unit is respectively connected to the mode switching module, the high-voltage battery pack and the motor, and the switch unit is respectively connected to the mode switching module and the motor;

[0005] The mode switching module is used to switch the charging mode and connect the charging circuit corresponding to the target charging mode in the target charging mode so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

[0006] In one embodiment, the charging mode includes a boost charging mode and a DC fast charging mode;

[0007] The mode switching module is also used to switch between the boost charging mode and the DC fast charging mode. The charging circuit corresponding to the boost charging mode is the boost charging circuit, and the charging circuit corresponding to the DC fast charging mode is the DC fast charging circuit.

[0008] in,

[0009] When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile returns to the negative electrode of the charging pile after passing through the mode switching module, the switch unit, the motor, the power unit, the high-voltage battery pack and the mode switching module in sequence;

[0010] When the DC fast charging circuit is connected, the current output from the positive electrode of the charging pile passes through the mode switching module, the high-voltage battery pack and the mode switching module in turn and returns to the negative electrode of the charging pile.

[0011] In one embodiment, the mode switching module includes a first switch, a second switch, and a third switch;

[0012] One end of the first switching switch and one end of the third switching switch are respectively connected to the positive pole of the charging pile, the other end of the first switching switch is connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch is connected to the negative pole of the charging pile, the other end of the second switching switch is connected to the second end of the high-voltage battery pack, and the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit.

[0013] In one embodiment, the high-voltage battery pack includes a power battery, a first main switch and a second main switch;

[0014] The positive electrode of the power battery is connected to one end of the first main switch, the other end of the first main switch is connected to the other end of the third switching switch, the negative electrode of the power battery is connected to the other end of the second switching switch, the negative electrode of the power battery is also connected to one end of the second main switch, and the other end of the second main switch is respectively connected to the third end of the power unit and the third end of the switch unit.

[0015] In one embodiment, the charging mode further includes a boost charging mode;

[0016] The mode switching module is also used to switch between the boost charging mode, the DC fast charging mode and the boost charging mode, and the charging circuit corresponding to the boost charging mode is the boost charging circuit;

[0017] in,

[0018] When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile passes through the mode switching module, power unit, motor, switch unit, mode switching module, high-voltage battery pack and mode switching module in sequence and then returns to the negative electrode of the charging pile.

[0019] In one embodiment, the mode switching module includes a first switch, a second switch, a third switch and a fourth switch;

[0020] One end of the first switching switch and one end of the third switching switch are respectively connected to the positive pole of the charging pile, the other end of the first switching switch and one end of the fourth switching switch are respectively connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch is connected to the negative pole of the charging pile, the other end of the second switching switch is connected to the second end of the high-voltage battery pack, the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit, and the other end of the fourth switching switch is connected to the fourth end of the high-voltage battery pack.

[0021] In one embodiment, the high-voltage battery pack includes a power battery, a first main switch and a second main switch;

[0022] The positive electrode of the power battery is connected to the other end of the fourth switching switch, the positive electrode of the power battery is also connected to one end of the first main switch, the other end of the first main switch is connected to the other end of the third switching switch, the negative electrode of the power battery is connected to the other end of the second switching switch, the negative electrode of the power battery is also connected to one end of the second main switch, and the other end of the second main switch is respectively connected to the third end of the power unit and the third end of the switch unit.

[0023] In one embodiment, the switch unit includes a fast charge switch and a pre-charge capacitor;

[0024] The common contact point of one end of the fast charging switch and one end of the pre-charge capacitor is connected to the other end of the first switching switch, the other end of the fast charging switch is connected to the motor, and the other end of the pre-charge capacitor is connected to the third end of the high-voltage battery pack.

[0025] In one embodiment, the switch unit further includes a power inductor;

[0026] The other end of the fast charging switch is connected to the neutral point of the three-phase winding of the motor through a power inductor. The power inductor is used to increase the charging power in boost charging mode and boost current charging mode.

[0027] In addition, to achieve the above purpose, the present application also proposes a control method of a charging control circuit, which is applied to the charging control circuit as described above, and the control method includes:

[0028] The charging mode is switched through the mode switching module, and the charging circuit corresponding to the target charging mode is connected in the target charging mode, so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

[0029] In addition, to achieve the above purpose, the present application also proposes a control method of a charging control circuit, which is applied to the charging control circuit as described above, and the control method includes:

[0030] Control the first switch and the second switch to be closed and the third switch to be opened, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is turned on in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack;

[0031] The second switch and the third switch are controlled to be closed and the first switch is disconnected, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack.

[0032] In addition, to achieve the above purpose, the present application also proposes a control method of a charging control circuit, which is applied to the charging control circuit as described above, and the control method includes:

[0033] Control the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is turned on in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack;

[0034] Control the second switch and the third switch to be closed, and the first switch and the fourth switch to be opened, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack;

[0035] The third switch and the fourth switch are controlled to be closed, and the first switch and the second switch are disconnected, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is connected in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack.

[0036] In addition, to achieve the above objectives, the present application also proposes an electric vehicle, including the charging control circuit and the motor as described above.

[0037] One or more technical solutions proposed in this application have at least the following technical effects:

[0038] A charging control circuit is proposed, including a mode switching module, a high-voltage battery pack and an integrated control module connected in sequence, the integrated control module including a power unit and a switch unit, the power unit is respectively connected to the mode switching module, the high-voltage battery pack and the motor, the switch unit is respectively connected to the mode switching module and the motor, the motor controller and the motor can be reused on the existing system, and only the mode switching module and the switch unit are added to realize multiple charging modes and adapt to multiple charging piles accordingly; the charging mode is switched by the mode switching module, specifically switching between any at least two charging modes of the boost charging mode, the DC fast charging mode and the boost current charging mode, so that the charging pile charges the high-voltage battery pack in different modes, so that the circuit can be applied to multiple different usage scenarios to improve the utilization rate of the charging pile, improve the charging speed, increase the applicability of the circuit, and save the difficulty and cost of vehicle development. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0041] Figure 1 This is a connection diagram of an embodiment of a charging control circuit of the present application;

[0042] Figure 2 This is a detailed connection diagram of another embodiment of the charging control circuit of the present application;

[0043] Figure 3 This is a schematic diagram of current flow in a boost charging mode in another embodiment of the charging control circuit of the present application;

[0044] Figure 4 This is a schematic diagram of current flow in a DC fast charging mode in another embodiment of the charging control circuit of the present application;

[0045] Figure 5 This is an application example diagram of another embodiment of the charging control circuit of the present application;

[0046] Figure 6 This is a detailed connection diagram of another embodiment of the charging control circuit of the present application;

[0047] Figure 7This is a schematic diagram of current flow in a boost charging mode in another embodiment of the charging control circuit of the present application;

[0048] Figure 8 This is a schematic diagram of current flow in a DC fast charging mode in another embodiment of the charging control circuit of the present application;

[0049] Fig. 9 This is a schematic diagram of current flow in a boost charging mode in another embodiment of the charging control circuit of the present application;

[0050] Fig.10 This is an application example diagram of another embodiment of the charging control circuit of the present application.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application, the directional indication is only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. In addition, if there are descriptions of "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, scheme B, or schemes that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0054] Electric vehicles are mainly divided into several types, including 400V low-voltage system, 600V medium-voltage system and 800V high-voltage system. Electric vehicle charging piles are generally divided into several types of DC charging piles, including 500V, 750V, 1000V (including 950V). Due to the influence of many factors such as DC charging speed and the matching of vehicle-pile power / voltage, many models cannot maximize the use of the power of the charging pile to achieve fast charging.

[0055] In the related technology, some solutions for improving the power utilization rate of charging piles have been proposed, but most of them require the vehicle model to match the charging pile voltage. For example, an 800V vehicle model can only be matched with a 750V or 1000V charging pile to achieve improvement. If a 500V charging pile is encountered, due to the limitation of the charging voltage at the charging pile end, it is still impossible to maximize the use of the power of the charging pile, resulting in a relatively slow charging speed. For another example, a 400V vehicle model matched with a 500V charging pile can maximize the use of the power of the charging pile and achieve fast charging. However, if a 750V or 1000V charging pile is encountered, due to the limitation of the charging current at the charging pile end, it is still impossible to maximize the use of the power of the charging pile, resulting in a relatively slow charging speed.

[0056] In addition, some related technologies have also proposed some solutions to improve the charging speed by boosting or high-power direct charging in case the vehicle to be charged does not match the charging pile. For example, the drive system is used to achieve boost charging. The problem with this solution is that it can only achieve a single charging method and does not support other charging methods other than boost charging, such as high-power direct charging. Correspondingly, the solution that supports high-power direct charging cannot support boost charging. Therefore, this single solution cannot take into account different usage scenarios, especially the scenario where high-power fast charging / super charging piles directly charge the vehicle, and has the problem of low applicability. Even if it is taken into account, a separate charging control system is set up, but this will lead to an increase in cables and interfaces between the battery pack / controller and the charging interface of the whole vehicle, which will increase the difficulty and cost of vehicle development.

[0057] In view of the above problems, the present application provides a charging control circuit and a control method thereof, and an electric vehicle. The present application and the following embodiments are described below in conjunction with the accompanying drawings.

[0058] The present application provides a charging control circuit.

[0059] In one embodiment of the charging control circuit of the present application, refer to Figure 1 , Figure 1This is a connection diagram of an embodiment of a charging control circuit, the charging control circuit is connected to a charging pile, and the charging control circuit includes a mode switching module, a high-voltage battery pack and an integrated control module connected in sequence, wherein the integrated control module includes a power unit and a switch unit, the power unit is respectively connected to the mode switching module, the high-voltage battery pack and the motor, and the switch unit is respectively connected to the mode switching module and the motor;

[0060] The mode switching module is used to switch the charging mode and connect the charging circuit corresponding to the target charging mode in the target charging mode so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

[0061] It should be noted that the charging control circuit can be applied to electric vehicles, and the charging pile refers to a DC or AC charging pile outside the electric vehicle; the high-voltage battery pack refers to the high-voltage battery of the entire vehicle of the electric vehicle, which provides high-voltage DC power for the electric vehicle. The high-voltage battery pack is part of the entire vehicle and is arranged in the electric vehicle; the motor refers to the drive motor of the electric vehicle, which is also arranged in the electric vehicle; the integrated control module can be a motor controller for driving and controlling the motor, such as Xin1 (all-in-one controller), which is arranged in the electric vehicle as an integrated control device; the mode switching module can be implemented by a switching circuit formed by connecting some simple switching devices such as contactors, circuit breakers, controllable switches, etc., or it can be implemented by a switching logic circuit formed by some logic devices or a program-controlled switching chip device, etc., and it can also have other electronic devices such as diodes required to achieve accurate on-off control to achieve accurate switching logic, which are not specifically limited here. In actual application, the mode switching module can be set outside the motor controller. The mode switching module can be controlled by an external control circuit or control device according to actual needs, or a controller can be set in the charging control circuit to output control instructions to the mode switching module to achieve charging mode switching. It can be understood that when the controller outputs the control instruction and whether the control instruction is a closing instruction or a disconnecting instruction can be set according to actual needs, and no specific limitation is made here.

[0062] It should also be noted that the power unit refers to a circuit composed of power electronic devices that accurately control the motor speed. The switch unit can decide whether to connect the motor controller and the motor to the charging circuit as needed. For example, it is closed in the boost charging mode and / or the boost current charging mode to reuse the motor and the motor controller for boost and / or boost current charging. For example, it is disconnected in the DC fast charging mode so that the charging pile can be directly connected to the high-voltage battery pack through the mode switching module without the need for the motor and the motor controller. The switch unit can be implemented by a simple one or more switching devices, or by a switch circuit or a switch chip to facilitate integration into the motor controller. The motor can be a three-phase motor with a three-phase winding. Correspondingly, the power unit in the integrated control module can use a three-phase bridge arm circuit, and the lead wire of each phase bridge arm circuit is connected to one of the three-phase windings. The common point of the three-phase winding can be connected to the switch unit separately.

[0063] It is understandable that the mode switching module in the charging control circuit can also be switched as needed when not charging, such as switching to the normal driving mode, so that the high-voltage battery pack, the integrated control module and the motor form a driving circuit to achieve normal operation of the motor. Therefore, the charging control circuit can realize arbitrary switching between multiple modes such as normal driving mode, boost charging mode, DC fast charging mode and boost current charging mode.

[0064] The charging control circuit proposed in this embodiment includes a mode switching module, a high-voltage battery pack and an integrated control module connected in sequence. The integrated control module includes a power unit and a switch unit. The power unit is respectively connected to the mode switching module, the high-voltage battery pack and the motor. The switch unit is respectively connected to the mode switching module and the motor. The motor controller and the motor can be reused on the existing system. Only by adding a mode switching module and a switch unit, a variety of charging modes can be realized and correspondingly adapted to a variety of charging piles; the charging mode is switched by the mode switching module, specifically switching between any at least two charging modes of the boost charging mode, the DC fast charging mode and the boost current charging mode, so that the charging pile charges the high-voltage battery pack in different modes, so that the circuit can be applied to multiple different usage scenarios to improve the utilization rate of the charging pile, improve the charging speed, increase the applicability of the circuit, and save the difficulty and cost of vehicle development.

[0065] In another embodiment of the charging control circuit of the present application, the same or similar contents as those in the above embodiment can be referred to the above description and will not be described in detail later. Figure 2 , Figure 2It is a detailed connection diagram of another embodiment of the charging control circuit, in which the charging mode includes a boost charging mode and a DC fast charging mode; the mode switching module is also used to switch between the boost charging mode and the DC fast charging mode, the charging circuit corresponding to the boost charging mode is a boost charging circuit, and the charging circuit corresponding to the DC fast charging mode is a DC fast charging circuit;

[0066] Among them, refer to Figure 3 , Figure 3 Schematic diagram of current flow in boost charging mode in this embodiment. In boost charging mode, the charging pile, mode switching module, switch unit, motor, power unit and high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile returns to the negative electrode of the charging pile after passing through the mode switching module, switch unit, motor, power unit, high-voltage battery pack and mode switching module in sequence; refer to Figure 4 , Figure 4 This is a schematic diagram of the current flow in the DC fast charging mode in this embodiment. In the DC fast charging mode, the charging pile, the mode switching module and the high-voltage battery pack form a DC fast charging circuit. When the DC fast charging circuit is connected, the current output from the positive electrode of the charging pile passes through the mode switching module, the high-voltage battery pack and the mode switching module in turn and returns to the negative electrode of the charging pile.

[0067] Optionally, the mode switching module can also switch to normal driving mode. In normal driving mode, the mode switching module will be completely disconnected, so that the connection between the charging pile and the high-voltage battery pack and the connection between the charging pile and the integrated control module are disconnected, so that the high-voltage battery pack is connected to the integrated control module to drive the motor to work normally.

[0068] It can be understood that the boost charging mode can be specifically used in the scenario of "car-pile" voltage mismatch, so that the charging pile can boost the high-voltage battery pack; the DC fast charging mode can be specifically used in the scenario of "car-ordinary pile" voltage matching, so that the charging pile with matching voltage can boost the high-voltage battery pack. Therefore, this circuit can fully tap the charging power of the charging pile and reuse the existing design, which not only realizes fast charging, but also takes into account a variety of charging scenarios under the premise of saving costs, and has high applicability, providing convenience for users and providing an efficient, fast and cost-saving charging solution.

[0069] In a possible implementation, Figure 2 As shown, the mode switching module may include a first switch S5, a second switch S6 and a third switch S7;

[0070] One end of the first switching switch S5 and one end of the third switching switch S7 are respectively connected to the positive pole of the charging pile, the other end of the first switching switch S5 is connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch S7 is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch S6 is connected to the negative pole of the charging pile, the other end of the second switching switch S6 is connected to the second end of the high-voltage battery pack, and the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit.

[0071] Among them, the first switch S5 is used as the front-end switch of boost charging, the second switch S6 is used as the fast charging negative switch, and the third switch S7 is used as the mode switching main switch. The first switch S5, the second switch S6 and the third switch S7 can be connected to an external control circuit or device or a controller separately provided in the charging control circuit to provide a control signal to control each switch to be closed or opened in the corresponding charging mode. The specific settings can also be made according to actual needs and are not limited here.

[0072] It can be understood that the mode switching module uses simple switching devices to achieve switching of multiple charging modes, which is easy to operate, has simple control logic and low cost.

[0073] In a possible implementation, Figure 2 As shown, the high-voltage battery pack may include a power battery B1, a first main switch S1 and a second main switch S3;

[0074] The positive electrode of the power battery B1 is connected to one end of the first main switch S1, the other end of the first main switch S1 is the first end of the high-voltage battery pack, and is connected to the other end of the third switching switch S7. The negative electrode of the power battery B1 is the second end of the high-voltage battery pack and is connected to the other end of the second switching switch S6. The negative electrode of the power battery B1 is also connected to one end of the second main switch S3, and the other end of the second main switch S3 is the third end of the high-voltage battery pack, which is respectively connected to the third end of the power unit and the third end of the switch unit.

[0075] Optionally, the high-voltage battery pack may also include a fuse F1, a pre-charging resistor R1 and a pre-charging switch S2; one end of the fuse F1 is connected to the positive electrode of the power battery B1, and the other end of the fuse F1 is respectively connected to one end of the first main switch S1 and one end of the pre-charging resistor R1, the other end of the pre-charging resistor R1 is connected to one end of the pre-charging switch S2, and the other end of the pre-charging switch S2 is connected to the other end of the first main switch S1. At this time, the common point of the other end of the first main switch S1 and the other end of the pre-charging switch S2 serves as the first end of the high-voltage battery pack.

[0076] In a possible implementation, Figure 2 As shown, the integrated control module may further include a first filtering unit and a second filtering unit;

[0077] The positive input end of the first filter unit is connected to the other end of the third switch S7 and the first end of the high-voltage battery pack respectively, the negative input end of the first filter unit is connected to the third end of the high-voltage battery pack, i.e., the other end of the second main switch S3, the positive output end of the first filter unit is connected to the positive DC bus of the power unit, and the negative output end of the first filter unit is connected to the negative DC bus of the power unit;

[0078] The positive input end of the second filter unit is connected to the other end of the first switching switch S5, the negative input end of the second filter unit is also connected to the other end of the second main switch S3, the positive output end of the second filter unit is connected to the common point of the first end of the switch unit, i.e., one end of the fast charging switch and one end of the pre-charge capacitor, and the negative output end of the second filter unit is connected to the third end of the switch unit, i.e., the other end of the pre-charge capacitor.

[0079] The first filter unit is used to implement electromagnetic compatibility (EMC) filtering in a normal driving mode, and the second filter unit is used to implement EMC filtering in a boost charging mode. The second filter unit may adopt an LC filter circuit.

[0080] In a possible implementation, Figure 2 As shown, the switch unit may include a fast charge switch S4 and a pre-charge capacitor Cin;

[0081] The common point of one end of the fast charging switch S4 and one end of the pre-charging capacitor Cin is the first end of the switching unit, which is connected to the other end of the first switching switch S5. The other end of the fast charging switch S4 is the second end of the switching unit, which is connected to the motor. The other end of the pre-charging capacitor Cin is the third end of the switching unit, which is connected to the third end of the high-voltage battery pack.

[0082] Among them, in the DC fast charging mode and the normal driving mode, the fast charging switch S4 will be disconnected, and in the boost charging mode, the fast charging switch S4 will be closed.

[0083] It should be noted that the first main switch S1, the pre-charging switch S2, the second main switch S3 and the fast charging switch S4 can all adopt controllable switching devices, which are connected to an external control circuit or device or a controller separately provided in the charging control circuit to provide a control signal to control each switch to be closed or opened in the corresponding charging mode. The specific settings can also be made according to actual needs and are not limited here.

[0084] In a specific implementation manner, Figure 3As shown, when the boost charging circuit is turned on, the current output from the positive electrode + of the charging pile passes through the first switching switch S5, the fast charging switch S4, the motor, the power unit, the first main switch S1, the power battery B1, and the second switching switch S6 and then returns to the negative electrode - of the charging pile; Figure 4 As shown, when the DC fast charging circuit is connected, the current output from the positive electrode + of the charging pile passes through the third switching switch S7, the first main switch S1, the power battery B1, and the second switching switch S6 in sequence and then returns to the negative electrode - of the charging pile.

[0085] Optionally, the switch unit may further include a power inductor;

[0086] The other end of the fast charging switch S4 is connected to the neutral point of the three-phase winding of the motor through a power inductor. The power inductor is used to increase the charging power in the boost charging mode.

[0087] Specifically, in the boost charging mode, the fast charging switch S4 is closed and the boost charging circuit is connected. The current flowing from the mode switching module to the switch unit flows through the closed fast charging switch S4 and the power inductor in sequence, and then enters the neutral point of the three-phase winding of the motor.

[0088] In a possible implementation, Figure 2 As shown, the power unit may include a bus capacitor Cap and power tubes Q1 to Q6;

[0089] One end of the bus capacitor Cap, the drain of the power tube Q1, the drain of the power tube Q2, and the drain of the power tube Q3 are all connected to the positive DC bus, the other end of the bus capacitor Cap, the source of the power tube Q4, the source of the power tube Q5, and the source of the power tube Q6 are all connected to the negative DC bus, the common connection point of the source of the power tube Q1 and the drain of the power tube Q4 is connected to the first phase winding of the motor, the common connection point of the source of the power tube Q2 and the drain of the power tube Q5 is connected to the second phase winding of the motor, the common connection point of the source of the power tube Q3 and the drain of the power tube Q6 is connected to the second phase winding of the motor, the gates of the power tubes Q1 to Q6 can be connected to an external control circuit or device or a controller separately provided in the charging control circuit to receive a pulse control signal to realize the on-off control of the power tubes Q1 to Q6, which can be specifically set according to actual needs and is not limited here.

[0090] For example, refer to Figure 5 , Figure 5 This is an application example diagram of this embodiment, and a specific application example is proposed. Among them, the mode switching module is connected to the fast charging port of the vehicle, and the fast charging port is connected to the external DC charging pile; the integrated control module specifically sets a boost interface and a PN interface, and the boost interface corresponds to Figure 2The port eBoost+ in the mode switching module is connected to the boost interface of the integrated control module through a boost cable; the high-voltage battery pack specifically sets a PN / boost interface and a fast charging interface, and the fast charging interface corresponds to Figure 2 The other end of the first main switch S1 and the negative electrode of the power battery B1, the mode switching module is connected to the fast charging interface of the high-voltage battery pack through a fast charging cable; the PN interface of the integrated control module corresponds to Figure 2 Port P and port N in the high-voltage battery pack correspond to the PN / boost interface Figure 2 The other end of the first main switch S1 and the other end of the second main switch S3, the PN interface of the integrated control module is connected to the PN / boost interface of the high-voltage battery pack through a PN cable. Among them, the boost cable, the fast charging cable and the PN cable can all use two-wire cables.

[0091] For OEMs (Original Equipment Manufacturers), by making topological changes to the existing charging system of electric vehicles and reusing related functions or interfaces, the wiring harness between the high-voltage battery pack and the all-in-one integrated controller can be normalized and simplified, thereby streamlining the wiring harness layout of the entire vehicle and realizing integrated circuit design. While solving the problem of long charging time for users, it also provides OEMs with in-depth solutions for reducing vehicle costs and further provides means for miniaturization, lightweighting and low cost of high-voltage component integration in the entire vehicle.

[0092] In this application example, the specific working process includes:

[0093] In normal driving mode, S1 and S3 are closed, and the other switches are open. The corresponding current trend is B1+→S1→power unit→motor→S3→B1-;

[0094] In the boost charging mode, S1, S3, S4, S5 and S6 are closed, and the other switches are open. It is specifically divided into the inductive energy storage process and the boost charging process. The current trend corresponding to the inductive energy storage process is charging pile +→S5→S4→motor→Q4 / Q5 / Q6→S3→S6→charging pile-, and the current trend corresponding to the boost charging process is charging pile +→S5→S4→motor→Q1 / Q2 / Q3→S1→B1→S6→charging pile-. Figure 3 As shown;

[0095] In the DC fast charging mode, S1, S6 and S7 are closed, and the other switches are open. The corresponding current trend is charging pile + → S7 → S1 → B1 → S6 → charging pile -. Figure 4 shown.

[0096] The charging control circuit proposed in this embodiment comprehensively considers the centralized form of DC charging from the vehicle / system level, and proposes a deeply integrated power topology for DC charging. It can realize arbitrary switching between normal driving mode, boost charging mode, and DC fast charging mode, and takes into account the application requirements of various scenarios such as "vehicle-ordinary charging pile" voltage matching and "vehicle-charging pile" voltage mismatch, and can cover the application scenarios of arbitrary matching of vehicles of different voltages and power levels with different charging piles.

[0097] In another embodiment of the charging control circuit of the present application, the same or similar contents as those in the above embodiment can be referred to the above description and will not be described in detail later. Figure 6 , Figure 6 Detailed connection diagram of another embodiment of the charging control circuit, in which the charging mode also includes a boost charging mode; the mode switching module is also used to switch between the boost charging mode, the DC fast charging mode and the boost charging mode, and the charging circuit corresponding to the boost charging mode is a boost charging circuit;

[0098] Among them, refer to Figure 7 , Figure 7 Schematic diagram of current flow in boost charging mode in this embodiment. In boost charging mode, the charging pile, mode switching module, switch unit, motor, power unit and high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile returns to the negative electrode of the charging pile after passing through the mode switching module, switch unit, motor, power unit, high-voltage battery pack and mode switching module in sequence; refer to Figure 8 , Figure 8 Schematic diagram of current flow in the DC fast charging mode of this embodiment. In the DC fast charging mode, the charging pile, the mode switching module and the high-voltage battery pack form a DC fast charging circuit. When the DC fast charging circuit is connected, the current output from the positive electrode of the charging pile passes through the mode switching module, the high-voltage battery pack and the mode switching module in turn and returns to the negative electrode of the charging pile; refer to Fig. 9 , Fig. 9 This is a schematic diagram of the current flow in the boost charging mode in this embodiment. In the boost charging mode, the charging pile, the mode switching module, the power unit, the motor, the switch unit and the high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile passes through the mode switching module, the power unit, the motor, the switch unit, the mode switching module, the high-voltage battery pack and the mode switching module in sequence and returns to the negative electrode of the charging pile.

[0099] It can be understood that the boost charging mode can be specifically used in the scenario of "car-pile" voltage mismatch, so that the charging pile can boost the high-voltage battery pack; the DC fast charging mode can be specifically used in the scenario of "car-ordinary pile" voltage matching, so that the charging pile with voltage matching can boost the high-voltage battery pack; the boost charging mode can be specifically used in the scenario of high-current fast charging when the "car-super charging pile" voltage matches, so that the charging pile can boost the high-voltage battery pack. Therefore, this circuit can more fully tap the charging power of the charging pile and reuse the existing design, which not only realizes fast charging, but also takes into account more charging scenarios under the premise of saving costs, and has higher applicability.

[0100] In a possible implementation, Figure 6 As shown, the mode switching module may include a first switch S5, a second switch S6, a third switch S7 and a fourth switch S8;

[0101] One end of the first switching switch S5 and one end of the third switching switch S7 are respectively connected to the positive pole of the charging pile, the other end of the first switching switch S5 and one end of the fourth switching switch are respectively connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch S7 is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch S6 is connected to the negative pole of the charging pile, the other end of the second switching switch S6 is connected to the second end of the high-voltage battery pack, the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit, and the other end of the fourth switching switch is connected to the fourth end of the high-voltage battery pack.

[0102] Among them, the first switch S5 is used as the front-end switch of boost charging, the second switch S6 is used as the fast charging negative switch, the third switch S7 is used as the mode switching main switch, and the fourth switch S8 is used as the mode switching auxiliary switch. The first switch S5, the second switch S6, the third switch S7 and the fourth switch S8 can be connected to an external control circuit or device or a controller separately provided in the charging control circuit to provide a control signal to control each switch to be closed or opened in the corresponding charging mode. The specific settings can also be made according to actual needs and are not limited here.

[0103] It can be understood that the mode switching module uses simple switching devices to achieve switching of more charging modes, which is easy to operate, has simple control logic and low cost.

[0104] In a possible implementation, Figure 6 As shown, the high-voltage battery pack may include a power battery B1, a first main switch S1 and a second main switch S3;

[0105] The positive electrode of the power battery B1 is the fourth end of the high-voltage battery pack and is connected to the other end of the fourth switching switch. The positive electrode of the power battery B1 is also connected to one end of the first main switch S1. The other end of the first main switch S1 is the first end of the high-voltage battery pack and is connected to the other end of the third switching switch S7. The negative electrode of the power battery B1 is the second end of the high-voltage battery pack and is connected to the other end of the second switching switch S6. The negative electrode of the power battery B1 is also connected to one end of the second main switch S3. The other end of the second main switch S3 is the third end of the high-voltage battery pack, which are respectively connected to the third end of the power unit and the third end of the switch unit.

[0106] Optionally, the high-voltage battery pack may further include a fuse F1, a pre-charging resistor R1 and a pre-charging switch S2; one end of the fuse F1 is connected to the positive electrode of the power battery B1, and at this time, the common connection point of one end of the fuse F1 and the positive electrode of the power battery B1 serves as the fourth end of the high-voltage battery pack, and the other end of the fuse F1 is respectively connected to one end of the first main switch S1 and one end of the pre-charging resistor R1, the other end of the pre-charging resistor R1 is connected to one end of the pre-charging switch S2, and the other end of the pre-charging switch S2 is connected to the other end of the first main switch S1, and at this time, the common connection point of the other end of the first main switch S1 and the other end of the pre-charging switch S2 serves as the first end of the high-voltage battery pack.

[0107] Alternatively, if Figure 6 As shown, the integrated control module may further include a first filtering unit and a second filtering unit, wherein the second filtering unit is used to implement EMC filtering in a boost charging mode and a current boost charging mode; the switch unit may include a fast charging switch S4 and a pre-charge capacitor Cin, and in the boost charging mode and the current boost charging mode, the fast charging switch S4 will be closed.

[0108] In a specific implementation manner, Figure 7 As shown, when the boost charging circuit is turned on, the current output from the positive electrode + of the charging pile passes through the first switching switch S5, the fast charging switch S4, the motor, the power unit, the first main switch S1, the power battery B1, and the second switching switch S6 and then returns to the negative electrode - of the charging pile; Figure 8 As shown, when the DC fast charging circuit is connected, the current output from the positive electrode + of the charging pile returns to the negative electrode - of the charging pile after passing through the third switching switch S7, the first main switch S1, the power battery B1, and the second switching switch S6 in sequence; Fig. 9 As shown, when the boost charging circuit is turned on, the current output from the positive electrode + of the charging pile passes through the third switching switch S7, the power unit, the motor, the fast charging switch S4, the fourth switching switch S8, the power battery B1, and the second switching switch S6 and then returns to the negative electrode - of the charging pile.

[0109] Optionally, the switch unit may further include a power inductor, which is used to increase the charging power in the boost charging mode and the boost current charging mode. In the boost current charging mode, the fast charging switch S4 is closed. When the boost current charging circuit is connected, the current flowing from the neutral point of the three-phase winding of the motor to the switch unit specifically flows through the power inductor and the fast charging switch S4 in sequence, and then enters the mode switching module; the power unit may include a bus capacitor Cap and power tubes Q1~Q6. For more specific implementation methods, please refer to the previous description, which will not be repeated here.

[0110] For example, refer to Fig.10 , Fig.10 This is an application example diagram of this embodiment, and a specific application example is proposed. Among them, the mode switching module is connected to the fast charging port of the vehicle, and the fast charging port is connected to the external DC charging pile; the integrated control module specifically sets a boost interface and a PN interface, and the boost interface corresponds to Figure 6 The port eBoost+ in the mode switching module is connected to the boost interface of the integrated control module through a boost cable; the high-voltage battery pack specifically sets a PN / boost / current boost interface and a fast charging interface, and the fast charging interface corresponds to Figure 6 The other end of the first main switch S1 and the negative electrode of the power battery B1, the mode switching module is connected to the fast charging interface of the high-voltage battery pack through a fast charging cable; the PN interface of the integrated control module corresponds to Figure 6 Port P and port N in the high-voltage battery pack correspond to the PN / boost / current boost interface Figure 6 The other end of the first main switch S1, the other end of the second main switch S3 and the positive electrode of the power battery B1, the PN interface of the integrated control module is connected to the PN / boost / boost interface of the high-voltage battery pack through a PN cable, and the mode switching module is also connected to the PN / boost / boost interface of the high-voltage battery pack through a boost cable. Among them, the boost cable, fast charging cable, PN cable and boost cable can all use two-wire cables.

[0111] In this application example, the specific working process includes:

[0112] In normal driving mode, S1 and S3 are closed, and the other switches are open. The corresponding current trend is B1+→S1→power unit→motor→S3→B1-;

[0113] In the boost charging mode, S1, S3, S4, S5 and S6 are closed, and the other switches are open. It is specifically divided into the inductive energy storage process and the boost charging process. The current trend corresponding to the inductive energy storage process is charging pile +→S5→S4→motor→Q4 / Q5 / Q6→S3→S6→charging pile-, and the current trend corresponding to the boost charging process is charging pile +→S5→S4→motor→Q1 / Q2 / Q3→S1→B1→S6→charging pile-. Figure 7 As shown;

[0114] In the DC fast charging mode, S1, S6 and S7 are closed, and the other switches are open. The corresponding current trend is charging pile + → S7 → S1 → B1 → S6 → charging pile -. Figure 8 As shown;

[0115] In the boost charging mode, S4, S6, S7 and S8 are closed, and the other switches are open. It is specifically divided into the inductive energy storage process and the step-down charging process. The current trend corresponding to the inductive energy storage process is charging pile +→S7→Q1 / Q2 / Q3→motor→S4→S8→B1→S6→charging pile-, such as Fig. 9 As shown, the current trend corresponding to the step-down charging process is charging pile +→S7→Q4 / Q5 / Q6→motor→S4→S8→B1→S6→charging pile-.

[0116] The charging control circuit proposed in this embodiment can realize arbitrary switching between normal driving mode, boost charging mode, DC fast charging mode and boost charging mode, taking into account the application requirements of more scenarios such as "vehicle-ordinary pile" voltage matching, "vehicle-pile" voltage mismatch, "vehicle-super charging pile" voltage matching, etc., and can cover the application scenarios of vehicles with different voltages and power levels and different charging piles. At the same time, it can also streamline the layout of the vehicle wiring harness and realize integrated circuit design, solve the problem of long charging time for users, and deeply explore the cost reduction plan for the whole vehicle for OEMs, and further provide means for the miniaturization, lightweight and low cost of the integration of high-voltage components of the whole vehicle.

[0117] The present application also provides a control method for a charging control circuit.

[0118] In one embodiment of a control method of a charging control circuit of the present application, the control method is applied to the above-mentioned charging control circuit, and the control method includes step S1:

[0119] Step S1, switching the charging mode through the mode switching module, and connecting the charging circuit corresponding to the target charging mode in the target charging mode, so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

[0120] In a feasible implementation, step S1 may include step S11 or S12:

[0121] Step S11, controlling the first switch and the second switch to be closed, and the third switch to be opened, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is turned on in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack;

[0122] Step S12, control the second switch and the third switch to close, and the first switch to open, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack.

[0123] It is understandable that when executing the above steps in actual applications, one of the steps may be selected to be executed, or the execution of step S11 may be switched to the execution of step S12, and steps S11 and S12 may not be executed at the same time.

[0124] In a feasible implementation, step S1 may include any one of steps S21 to S23:

[0125] Step S21, controlling the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is turned on in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack;

[0126] Step S22, controlling the second switch and the third switch to be closed, and the first switch and the fourth switch to be opened, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack;

[0127] Step S23, control the third switch and the fourth switch to close, and the first switch and the second switch to open, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is connected in the boost charging mode, so that the charging pile can perform boost charging on the high-voltage battery pack.

[0128] It is understandable that when executing the above steps in actual applications, one of the steps can be selected to be executed, or the execution of step S21 can be switched to the execution of any other step, and steps S21-S23 will not be executed at the same time.

[0129] It should be noted that the specific implementation of the charging control circuit refers to the above embodiments. Since the control method of the charging control circuit adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0130] The application also proposes an electric car.

[0131] In one embodiment of the electric vehicle of the present application, the electric vehicle may include a charging control circuit and a motor.

[0132] Optionally, a vehicle controller may also be included, which is connected to the charging control circuit, and specifically may be connected to each switching switch in the mode switching module, to each switch in the high-voltage battery pack, to the fast charging switch in the switch unit, and to the gate of each power tube in the power unit, to realize switch control and switch control of the power tube, which is specifically set according to actual needs and is not specifically limited here.

[0133] Among them, the vehicle controller can implement the steps of the above-mentioned control method of the charging control circuit.

[0134] It should be noted that the specific implementation methods of the charging control circuit and the control method thereof refer to the above embodiments. Since the electric vehicle adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0135] The above are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A charging control circuit, suitable for connecting to a charging pile, characterized in that: The charging control circuit comprises a mode switching module, a high-voltage battery pack and an integrated control module connected in sequence, wherein the integrated control module comprises a power unit and a switch unit, the power unit is respectively connected to the mode switching module, the high-voltage battery pack and the motor, and the switch unit is respectively connected to the mode switching module and the motor; The mode switching module is used to switch the charging mode and connect the charging circuit corresponding to the target charging mode in the target charging mode, so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

2. The charging control circuit according to claim 1, characterized in that: The charging mode includes a boost charging mode and a DC fast charging mode; The mode switching module is also used to switch between the boost charging mode and the DC fast charging mode, the charging circuit corresponding to the boost charging mode is a boost charging circuit, and the charging circuit corresponding to the DC fast charging mode is a DC fast charging circuit; in, When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile returns to the negative electrode of the charging pile after passing through the mode switching module, the switch unit, the motor, the power unit, the high-voltage battery pack and the mode switching module in sequence; When the DC fast charging circuit is turned on, the current output from the positive electrode of the charging pile returns to the negative electrode of the charging pile after passing through the mode switching module, the high-voltage battery pack and the mode switching module in sequence.

3. The charging control circuit according to claim 2, characterized in that: The mode switching module includes a first switching switch, a second switching switch and a third switching switch; One end of the first switching switch and one end of the third switching switch are respectively connected to the positive electrode of the charging pile, the other end of the first switching switch is connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch is connected to the negative electrode of the charging pile, the other end of the second switching switch is connected to the second end of the high-voltage battery pack, and the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit.

4. The charging control circuit according to claim 3, characterized in that: The high-voltage battery pack includes a power battery, a first main switch and a second main switch; The positive electrode of the power battery is connected to one end of the first main switch, the other end of the first main switch is connected to the other end of the third switching switch, the negative electrode of the power battery is connected to the other end of the second switching switch, the negative electrode of the power battery is also connected to one end of the second main switch, and the other end of the second main switch is respectively connected to the third end of the power unit and the third end of the switch unit.

5. The charging control circuit according to claim 2, characterized in that: The charging mode also includes a current boost charging mode; The mode switching module is further used to switch between the boost charging mode, the DC fast charging mode and the boost charging mode, and the charging circuit corresponding to the boost charging mode is a boost charging circuit; in, When the boost charging circuit is turned on, the current output from the positive electrode of the charging pile passes through the mode switching module, the power unit, the motor, the switch unit, the mode switching module, the high-voltage battery pack and the mode switching module in sequence and then returns to the negative electrode of the charging pile.

6. The charging control circuit according to claim 5, characterized in that: The mode switching module includes a first switching switch, a second switching switch, a third switching switch and a fourth switching switch; One end of the first switching switch and one end of the third switching switch are respectively connected to the positive electrode of the charging pile, the other end of the first switching switch and one end of the fourth switching switch are respectively connected to the first end of the switch unit, the second end of the switch unit is connected to the motor, the other end of the third switching switch is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the second end of the power unit is connected to the motor, one end of the second switching switch is connected to the negative electrode of the charging pile, the other end of the second switching switch is connected to the second end of the high-voltage battery pack, the third end of the high-voltage battery pack is respectively connected to the third end of the power unit and the third end of the switch unit, and the other end of the fourth switching switch is connected to the fourth end of the high-voltage battery pack.

7. The charging control circuit according to claim 6, characterized in that: The high-voltage battery pack includes a power battery, a first main switch and a second main switch; The positive electrode of the power battery is connected to the other end of the fourth switching switch, the positive electrode of the power battery is also connected to one end of the first main switch, the other end of the first main switch is connected to the other end of the third switching switch, the negative electrode of the power battery is connected to the other end of the second switching switch, the negative electrode of the power battery is also connected to one end of the second main switch, and the other end of the second main switch is respectively connected to the third end of the power unit and the third end of the switch unit.

8. The charging control circuit according to claim 3, 4, 6 or 7, characterized in that: The switch unit includes a fast charge switch and a pre-charge capacitor; The common contact of one end of the fast charging switch and one end of the pre-charge capacitor is connected to the other end of the first switching switch, the other end of the fast charging switch is connected to the motor, and the other end of the pre-charge capacitor is connected to the third end of the high-voltage battery pack.

9. The charging control circuit according to claim 8, characterized in that: The switch unit also includes a power inductor; The other end of the fast charging switch is connected to the neutral point of the three-phase winding of the motor through the power inductor, and the power inductor is used to increase the charging power in the boost charging mode and the boost current charging mode.

10. A control method for a charging control circuit, characterized in that: Applied to the charging control circuit according to any one of claims 1 to 9, the control method comprises: The charging mode is switched by the mode switching module, and the charging circuit corresponding to the target charging mode is connected in the target charging mode, so that the charging pile can charge the high-voltage battery pack in different modes; wherein the charging mode includes any at least two of the boost charging mode, the DC fast charging mode and the boost current charging mode.

11. A control method for a charging control circuit, characterized in that: Applied to the charging control circuit as claimed in claim 3, the control method comprises: Controlling the first switch and the second switch to be closed and the third switch to be opened, so that the mode switching module switches to the boost charging mode, and in the boost charging mode, the boost charging circuit is turned on, so that the charging pile performs boost charging on the high-voltage battery pack; Control the second switching switch and the third switching switch to be closed and the first switching switch to be open, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack.

12. A control method for a charging control circuit, characterized in that: Applied to the charging control circuit as claimed in claim 6, the control method comprises: Controlling the first switch and the second switch to be closed, and the third switch and the fourth switch to be opened, so that the mode switching module switches to the boost charging mode, and in the boost charging mode, the boost charging circuit is turned on, so that the charging pile performs boost charging on the high-voltage battery pack; Control the second switch and the third switch to be closed, and the first switch and the fourth switch to be opened, so that the mode switching module switches to the DC fast charging mode, and the DC fast charging circuit is connected in the DC fast charging mode, so that the charging pile performs DC fast charging on the high-voltage battery pack; The third switching switch and the fourth switching switch are controlled to be closed, and the first switching switch and the second switching switch are disconnected, so that the mode switching module switches to the boost charging mode, and the boost charging circuit is connected in the boost charging mode, so that the charging pile performs boost charging on the high-voltage battery pack.

13. An electric vehicle, characterized in that: The invention comprises a charging control circuit and a motor as claimed in any one of claims 1 to 9.

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