Charging control integrated circuit, control method thereof and electric vehicle

Abstract

The invention discloses a charging control integrated circuit, a control method thereof and an electric automobile, and relates to the technical field of charging control, the charging control integrated circuit comprises a high-voltage battery pack and an integrated controller, the integrated controller comprises a direct current charging module and a motor, and the direct current charging module comprises a power unit and a switch unit; the power unit is connected with the high-voltage battery pack and the motor. The switch unit is connected with the charging pile, the high-voltage battery pack and the motor. The switch unit is used for switching on different charging loops according to the on-off of the switch unit, so that the charging control integrated circuit enters different charging modes; wherein the charging loop comprises at least two of a boost charging loop, a direct-current quick charging loop and a current-rising charging loop. According to the invention, the circuit applicability and integration are 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 integrated 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 car 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. In addition, if these single charging solutions are forcibly combined into one circuit to achieve multiple charging, there will be problems with complex circuit structure and low integration. Summary of the invention

[0003] The main purpose of this application is to provide a charging control integrated circuit and a control method thereof, and an electric vehicle, aiming to solve the technical problems of low applicability and integration of charging solutions in related technologies.

[0004] To achieve the above-mentioned purpose, the present application proposes a charging control integrated circuit, which is suitable for connecting to a charging pile. The charging control integrated circuit includes a high-voltage battery pack and an integrated controller. The integrated controller includes a DC charging module and a motor. The DC charging module includes a power unit and a switch unit.

[0005] The power unit is connected to the high-voltage battery pack and the motor respectively, and the switch unit is connected to the charging pile, the high-voltage battery pack and the motor respectively;

[0006] The switch unit is used to switch on different charging circuits according to its own on and off, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of a boost charging circuit, a DC fast charging circuit and a current boost charging circuit.

[0007] The present application also proposes a control method for a charging control integrated circuit, which is applied to the charging control integrated circuit. The control method includes:

[0008] The first switch and the second switch are controlled to be closed, and the third switch is controlled to be opened, so that the boost charging circuit is connected; or, the first switch and the third switch are controlled to be closed, and the second switch is controlled to be opened, so that the DC fast charging circuit is connected.

[0009] To achieve the above purpose, the present application also proposes a control method for a charging control integrated circuit, which is applied to the charging control integrated circuit. The control method includes:

[0010] Control the first switch, the second switch and the fourth switch to close, and the third switch to open, so that the boost charging circuit is connected; control the first switch and the third switch to close, and the second switch and the fourth switch to open, so that the DC fast charging circuit is connected; or control the first switch, the second switch and the third switch to close, and the fourth switch to open, so that the boost charging circuit is connected.

[0011] In addition, to achieve the above purpose, the present application also proposes a charging control integrated circuit, which is connected to a DC charging pile and an AC charging pile respectively, and the charging control integrated circuit includes a high-voltage battery pack, a low-voltage battery pack and an integrated controller, and the integrated controller includes a DC charging module, an AC charging module and a motor, and the DC charging module includes a power unit and a switch unit, and the AC charging module includes an OBC unit and a DCDC conversion unit;

[0012] The power unit is connected to the high-voltage battery pack and the motor respectively, and the switch unit is connected to the DC charging pile, the high-voltage battery pack and the motor respectively; the OBC unit is connected to the AC charging pile, the high-voltage battery pack and the DCDC conversion unit respectively, and the DCDC conversion unit is connected to the low-voltage battery pack;

[0013] The switch unit is used to switch on different charging circuits according to its own on and off state, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of an AC slow charging circuit, a DC fast charging circuit, a DC boost charging circuit and a DC current boost charging circuit.

[0014] The present application also proposes a control method for a charging control integrated circuit, which is applied to the charging control integrated circuit. The control method includes:

[0015] Control the first switch, the second switch, the third switch and the fourth switch to be disconnected to connect the AC slow charging circuit; control the first switch and the third switch to be closed, and the second switch and the fourth switch to be disconnected to connect the DC fast charging circuit; control the first switch, the second switch and the fourth switch to be closed, and the third switch to be disconnected to connect the DC boost charging circuit; or control the first switch, the second switch and the third switch to be closed, and the fourth switch to be disconnected to connect the DC boost charging circuit.

[0016] In addition, to achieve the above-mentioned purpose, the present application also proposes an electric vehicle, comprising the charging control integrated circuit as described above.

[0017] One or more technical solutions proposed in this application have at least the following technical effects:

[0018] A charging control integrated circuit is proposed, comprising a high-voltage battery pack and an integrated controller, the integrated controller comprising a DC charging module and a motor, the DC charging module comprising a power unit and a switch unit, wherein the power unit is respectively connected to the high-voltage battery pack and the motor, and the switch unit is respectively connected to the charging pile, the high-voltage battery pack and the motor; the motor controller and the motor can be reused on the existing system, and only a switch unit is added inside the motor controller to realize multiple charging modes and adapt to multiple charging piles; the switch unit can switch on different charging circuits according to its own on-off switching, so that the charging control integrated circuit enters different charging modes, including switching on any at least two of the boost charging circuit, the DC fast charging circuit and the boost charging circuit, 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, and increase the applicability of the circuit; in addition, integrating the main part of the circuit into the motor controller to form an integrated controller can increase the circuit integration and save the difficulty and cost of vehicle development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 This is a connection diagram of an embodiment of a charging control integrated circuit of the present application;

[0021] Figure 2 Another connection diagram of an embodiment of the charging control integrated circuit of the present application;

[0022] Figure 3 This is a detailed connection diagram of another embodiment of the charging control integrated circuit of the present application;

[0023] Figure 4 This is a schematic diagram of current flow in a boost charging circuit in another embodiment of the charging control integrated circuit of the present application;

[0024] Figure 5 This is a schematic diagram of the current flow of a DC fast charging circuit in another embodiment of the charging control integrated circuit of the present application;

[0025] Figure 6 This is an application example diagram of another embodiment of the charging control integrated circuit of the present application;

[0026] Figure 7This is a detailed connection diagram of another embodiment of the charging control integrated circuit of the present application;

[0027] Figure 8 This is a schematic diagram of current flow in a boost charging circuit in another embodiment of the charging control integrated circuit of the present application;

[0028] Fig. 9 This is a schematic diagram of current flow in a DC fast charging circuit in another embodiment of the charging control integrated circuit of the present application;

[0029] Fig.10 This is a schematic diagram of current flow in a current boost charging circuit in another embodiment of the charging control integrated circuit of the present application;

[0030] Fig.11 This is an application example diagram of another embodiment of the charging control integrated circuit of the present application;

[0031] Fig.12 This is a connection diagram of another embodiment of the charging control integrated circuit of the present application;

[0032] Fig.13 This is another connection diagram of yet another embodiment of the charging control integrated circuit of the present application;

[0033] Fig.14 This is a detailed connection diagram of another embodiment of the charging control integrated circuit of the present application;

[0034] Fig.15 This is a schematic diagram of current flow in an AC slow charging circuit in yet another embodiment of the charging control integrated circuit of the present application;

[0035] Fig.16 This is a schematic diagram of current flow in a DC fast charging circuit in yet another embodiment of the charging control integrated circuit of the present application;

[0036] Fig.17 This is a schematic diagram of current flow in a DC boost charging circuit in yet another embodiment of the charging control integrated circuit of the present application;

[0037] Fig.18 This is a schematic diagram of current flow in a DC boost charging circuit in yet another embodiment of the charging control integrated circuit of the present application;

[0038] Fig.19 This is an application example diagram of yet another embodiment of the charging control integrated circuit of the present application.

[0039] 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

[0040] 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.

[0041] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only 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 limited to "first" and "second" may 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, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] 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.

[0043] 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.

[0044] 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 model 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 fast charge the vehicle and the single-phase / three-phase compatible slow charging scenario, and has the problem of low applicability. Even if it is taken into account, these single charging solutions are forcibly combined into one circuit to achieve multiple charging, or a charging control system is set up separately, but this will lead to problems of complex circuit structure and low integration, as well as 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.

[0045] In view of the above problems, the present application provides a charging control integrated 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.

[0046] The present application provides a charging control integrated circuit.

[0047] In one embodiment of the charging control integrated circuit of the present application, refer to Figure 1 , Figure 1 This is a connection diagram of an embodiment of a charging control integrated circuit, the charging control integrated circuit is connected to a charging pile, the charging control integrated circuit includes a high-voltage battery pack and an integrated controller, the integrated controller includes a DC charging module and a motor, the DC charging module includes a power unit and a switch unit, the power unit is respectively connected to the high-voltage battery pack and the motor, and the switch unit is respectively connected to the charging pile, the high-voltage battery pack and the motor;

[0048] Among them, the switch unit is used to switch on different charging circuits according to its own on and off, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of a boost charging circuit, a DC fast charging circuit and a current boost charging circuit.

[0049] It should be noted that the charging control integrated circuit can be applied to electric vehicles. 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 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 controller can be a motor controller that drives and controls the motor, such as Xin1 (all-in-one controller), which is arranged in the electric vehicle as an integrated control device, and the DC charging module is part of the integrated controller.

[0050] It should also be noted that the DC charging module includes a power unit and a switch unit. The power unit refers to a circuit composed of power electronic devices that accurately control the motor speed. The switch unit can connect different charging circuits according to its own on-off switching, so that the charging control integrated circuit enters different charging modes, so that the charging pile can charge the high-voltage battery pack in different modes. In actual application, the switch unit can be implemented by a switch circuit formed by connecting some simple switching devices such as contactors, circuit breakers, and controllable switches, or it can be implemented by a switch logic circuit formed by some logic devices or a program-controlled switch chip device, so as to be integrated inside the motor controller. 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 addition, the switch unit can be controlled by an external control circuit according to actual needs, or a separate controller can be set in the charging control integrated circuit to output control instructions to the DC charging module in the integrated controller to realize the on-off switching of the switch unit. A control module can also be set in the integrated controller to realize the on-off switching of the switch unit, thereby realizing the switching of the charging mode. It can be understood that when the control circuit, controller or control module outputs the control instruction, the control instruction is specifically a closing instruction or a disconnecting instruction, which can be set according to actual needs and is not specifically limited here. The motor can be a three-phase motor with a three-phase winding. Correspondingly, the power unit in the DC charging module in the integrated controller can adopt a three-phase bridge arm circuit, and the lead wire of each phase bridge arm circuit is connected to one phase winding of the three-phase winding, and the common connection point of the three-phase winding can be connected to the switch unit separately.

[0051] It is understandable that the switch unit in the charging control integrated 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 controller and the motor form a driving circuit to achieve normal operation of the motor. Therefore, the charging control integrated 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.

[0052] In one possible implementation, refer to Figure 2 , Figure 2 : is another connection diagram of the charging control integrated circuit in this embodiment. The integrated controller may further include a filter module; the power unit is connected to the high-voltage battery pack through the filter module, and the switch unit is also connected to the high-voltage battery pack and the charging pile respectively through the filter module;

[0053] The filter module is used to implement electromagnetic compatibility (EMC) filtering in normal driving mode and to implement EMC filtering in boost charging mode.

[0054] The charging control integrated circuit proposed in this embodiment includes a high-voltage battery pack and an integrated controller, the integrated controller includes a DC charging module and a motor, the DC charging module includes a power unit and a switch unit, wherein the power unit is respectively connected to the high-voltage battery pack and the motor, and the switch unit is respectively connected to the charging pile, the high-voltage battery pack and the motor; the motor controller and the motor can be reused on the existing system, and only a switch unit is added inside the motor controller to realize multiple charging modes and adapt to multiple charging piles; the switch unit can switch on different charging circuits according to its own on-off switching, so that the charging control integrated circuit enters different charging modes, including switching on any at least two of the boost charging circuit, the DC fast charging circuit and the boost charging circuit, 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, and increase the applicability of the circuit; in addition, integrating the main part of the circuit into the motor controller to form an integrated controller can increase the circuit integration and save the difficulty and cost of vehicle development.

[0055] In another embodiment of the charging control integrated 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 3 , Figure 3 This is a detailed connection diagram of another embodiment of a charging control integrated circuit. The charging mode of the charging control integrated circuit may include a boost charging mode and a DC fast charging mode; correspondingly, the charging circuit may include a boost charging circuit and a DC fast charging circuit. The charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack constitute a boost charging circuit. The charging pile, the switch unit and the high-voltage battery pack constitute a DC fast charging circuit. The switch unit is also used to switch on the boost charging circuit or the DC fast charging circuit.

[0056] Among them, when the boost charging circuit is connected, the current output from the positive pole of the charging pile passes through the switch unit, motor, power unit, high-voltage battery pack and switch unit in sequence and then returns to the negative pole of the charging pile; when the DC fast charging circuit is connected, the current output from the positive pole of the charging pile passes through the switch unit, high-voltage battery pack and switch unit in sequence and then returns to the negative pole of the charging pile.

[0057] Reference Figure 4 , Figure 4 Schematic diagram of current flow of the boost charging circuit in this embodiment. The charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the circuit enters the boost charging mode. The current output from the positive electrode of the charging pile passes through the switch unit, the motor, the power unit, the high-voltage battery pack and the switch unit in sequence and then returns to the negative electrode of the charging pile, thereby realizing the boost charging of the high-voltage battery pack by the charging pile. Figure 5 , Figure 5 This is a schematic diagram of the current flow of the DC fast charging circuit in this embodiment. The charging pile, the switch unit and the high-voltage battery pack form a DC fast charging circuit. When the DC fast charging circuit is connected, the circuit enters the DC fast charging mode. The current output from the positive electrode of the charging pile passes through the switch unit, the high-voltage battery pack and the switch unit in sequence and returns to the negative electrode of the charging pile, thereby realizing DC fast charging of the high-voltage battery pack by the charging pile.

[0058] Optionally, the switch unit can also 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 controller are both disconnected, so that the high-voltage battery pack is connected to the integrated controller, allowing the drive motor to work normally, so that the charging control integrated circuit can switch to normal driving mode.

[0059] It can be understood that the charging control integrated circuit can switch between normal driving mode, boost charging mode and DC fast charging mode, among which the boost charging mode can be specifically used in the scenario of "car-pile" voltage mismatch, so that the charging pile can boost and charge 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 and charge the high-voltage battery pack. Therefore, the 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.

[0060] In a possible implementation, Figure 3As shown, the switch unit may include a first switch S4, a second switch S5 and a third switch S6; wherein, one end of the first switch S4 serves as the first end of the switch unit, connected to the positive electrode of the charging pile, the other end of the first switch S4 is respectively connected to one end of the second switch S5 and one end of the third switch S6, the other end of the second switch S5 serves as the second end of the switch unit, connected to the motor, the other end of the third switch S6 serves as the third end of the switch unit, 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, the second end of the high-voltage battery pack is respectively connected to the third end of the power unit and the negative electrode of the charging pile through the switch unit, specifically, the second end of the high-voltage battery pack is connected to the fourth end of the switch unit, the fourth end of the switch unit is connected to the fifth end of the switch unit, and the fifth end of the switch unit is then connected to the negative electrode of the charging pile.

[0061] It should be noted that the first switch S4, the second switch S5 and the third switch S6 can be connected to an external control circuit or a controller or control module provided in the charging control integrated 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.

[0062] It can be understood that the switch unit uses simple switching devices to achieve on-off switching of multiple charging circuits, so that the charging pile can charge the high-voltage battery pack in different modes, which is easy to operate, has simple control logic and low cost.

[0063] In a possible implementation, Figure 3 As shown, the high-voltage battery pack may include a power battery B1, a first main switch S1 and a second main switch S3; 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 switch S6, the negative electrode of the power battery B1 is connected to one end of the second main switch S3, the other end of the second main switch S3 is the second end of the high-voltage battery pack, and is respectively connected to the third end of the power unit and the negative electrode of the charging pile through the switch unit.

[0064] 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.

[0065] It should be noted that the first main switch S1, the pre-charge switch S2 and the second main switch S3 can all adopt controllable switch devices, which are connected to an external control circuit or a controller or control module provided in the charging control integrated 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.

[0066] In a specific implementation manner, Figure 4 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 switch S4, the second switch S5, the motor, the power unit, the first main switch S1, the power battery B1, the second main switch S3 and then returns to the negative electrode - of the charging pile; Figure 5 As shown, when the DC fast charging circuit is connected, the current output from the positive electrode + of the charging pile passes through the first switch S4, the third switch S6, the first main switch S1, the power battery B1, and the second main switch S3 in sequence and then returns to the negative electrode - of the charging pile.

[0067] In a possible implementation, Figure 3 As shown, the filter module can use an EMC filter; the EMC filter can include a first filter unit and a second filter unit (not shown in the figure); the positive input end of the first filter unit is connected to the first end of the high-voltage battery pack, the negative input end of the first filter unit is connected to the second end of the high-voltage battery pack, that is, the other end of the second main switch S3, the positive output end of the first filter unit is respectively connected to the positive DC bus of the power unit and the third end of the switch unit, that is, the other end of the third switch S6, and the negative output end of the first filter unit is respectively connected to the negative DC bus of the power unit and the fourth end of the switch unit; the positive input end of the second filter unit is connected to the positive pole of the charging pile, the negative input end of the second filter unit is connected to the negative pole of the charging pile, the positive output end of the second filter unit is connected to the first end of the switch unit, that is, one end of the first switch S4, and the negative output end of the second filter unit is connected to the fifth end of the switch unit. Among them, the first filter unit can realize EMC filtering in normal driving mode, the second filter unit can realize EMC filtering in boost charging mode, and the second filter unit can use an LC filter circuit.

[0068] In a possible implementation, Figure 3 As shown, the switch unit may include a pre-charge capacitor Cin; one end of the pre-charge capacitor Cin is connected to the other end of the first switch S4, and the other end of the pre-charge capacitor Cin is the fourth end of the switch unit, which is connected to the second end of the high-voltage battery pack, that is, the other end of the second main switch S3.

[0069] Optionally, the switch unit may further include a power inductor; the other end of the second switch S5 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 when the boost charging circuit is turned on.

[0070] Specifically, in the boost charging mode, the first switch S4 and the second switch S5 are closed. When the boost charging circuit is turned on, the current flowing from the positive pole of the charging pile to the switch unit flows through the closed first switch S4, the second switch S5 and the power inductor in sequence, and then enters the neutral point of the three-phase winding of the motor.

[0071] In a possible implementation, Figure 3 As shown, the power unit may include a bus capacitor Cap and power tubes Q1 to Q6;

[0072] 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 the control circuit, controller or control module outside the power unit to receive a pulse control signal to realize the on-off control of the power tubes Q1 to Q6, which can be set according to actual needs and is not limited here.

[0073] For example, refer to Figure 6 , Figure 6 This is an application example diagram of this embodiment, and a specific application example is proposed. Among them, the integrated controller is directly connected to the fast charging port of the vehicle, and the fast charging port is connected to the external DC charging pile; the integrated controller specifically sets a fast charging / boost interface and a PN / boost interface, and the fast charging / boost interface corresponds to Figure 3 The eBoost+ / FC+ and FC- ports in the fast charge port can be connected to the fast charge / boost port of the integrated controller through a fast charge / boost cable; the high-voltage battery pack specifically sets a PN / boost port, and the PN / boost port of the integrated controller corresponds to Figure 3 Port P and port N in the high-voltage battery pack correspond to the PN / boost interface Figure 3 The other end of the first main switch S1 and the other end of the second main switch S3, the PN / boost interface of the integrated controller is connected to the PN / boost interface of the high-voltage battery pack through the PN / boost cable. Among them, the fast charging cable, the boost cable and the PN cable can all use two-wire cables.

[0074] 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.

[0075] In this application example, the specific working process includes:

[0076] Control S1 and S3 to close, and the other switches to open, the normal drive circuit is connected, and the circuit enters the normal drive mode. When the circuit is connected, the corresponding current trend is B1+→S1→power unit→motor→S3→B1-;

[0077] Control S1, S3, S4, and S5 to be closed, and the other switches to be disconnected, the boost charging circuit is connected, and the circuit enters the boost charging mode. When the circuit is connected, it is divided into an inductive energy storage process and a boost charging process. The current trend corresponding to the inductive energy storage process is, charging pile +→S4→S5→motor→Q4 / Q5 / Q6→charging pile-, and the current trend corresponding to the boost charging process is, charging pile +→S4→S5→motor→Q1 / Q2 / Q3→S1→B1→S3→charging pile-, such as Figure 4 As shown;

[0078] Control S1, S3, S4, and S6 to close, and the other switches to open, the DC fast charging circuit is connected, and the circuit enters the DC fast charging mode. When the circuit is connected, the corresponding current trend is charging pile +→S4→S6→S1→B1→S3→charging pile-, such as Figure 5 shown.

[0079] The charging control integrated 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.

[0080] In another embodiment of the charging control integrated 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 7 , Figure 7This is a detailed connection diagram of another embodiment of a charging control integrated circuit. The charging mode of the charging control integrated circuit may also include a boost charging mode. Correspondingly, the charging circuit may also include a boost charging circuit. The charging pile, the switch unit, the power unit, the motor and the high-voltage battery pack constitute the boost charging circuit. The switch unit is also used to switch on the boost charging circuit, the DC fast charging circuit or the boost charging circuit.

[0081] Among them, when the boost charging circuit is turned on, the current output from the positive electrode of the charging pile passes through the switch unit, power unit, motor, switch unit, high-voltage battery pack and switch unit in sequence and then returns to the negative electrode of the charging pile.

[0082] Reference Figure 8 , Figure 8 Schematic diagram of current flow of the boost charging circuit in this embodiment. The charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the circuit enters the boost charging mode. The current output from the positive electrode of the charging pile passes through the switch unit, the motor, the power unit, the high-voltage battery pack and the switch unit in sequence and then returns to the negative electrode of the charging pile, thereby realizing the boost charging of the high-voltage battery pack by the charging pile. Fig. 9 , Fig. 9 Schematic diagram of the current flow of the DC fast charging circuit in this embodiment. The charging pile, the switch unit and the high-voltage battery pack form a DC fast charging circuit. When the DC fast charging circuit is connected, the circuit enters the DC fast charging mode. The current output by the positive electrode of the charging pile passes through the switch unit, the high-voltage battery pack and the switch unit in turn and returns to the negative electrode of the charging pile, thereby realizing the DC fast charging of the high-voltage battery pack by the charging pile; refer to Fig.10 , Fig.10 This is a schematic diagram of the current flow of the boost charging circuit in this embodiment. The charging pile, switch unit, power unit, motor and high-voltage battery pack form a boost charging circuit. When the boost charging circuit is turned on, the circuit enters the boost charging mode. The current output from the positive electrode of the charging pile passes through the switch unit, power unit, motor, switch unit, high-voltage battery pack and switch unit in sequence and returns to the negative electrode of the charging pile, thereby realizing the boost charging of the high-voltage battery pack by the charging pile.

[0083] 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.

[0084] In a possible implementation, Figure 7 As shown, the switch unit may include a first switch S4, a second switch S5, a third switch S6 and a fourth switch S7; wherein, one end of the first switch S4 serves as the first end of the switch unit and is connected to the positive electrode of the charging pile, the other end of the first switch S4 is respectively connected to one end of the third switch S6 and one end of the fourth switch S7, the other end of the fourth switch S7 serves as the sixth end of the switch unit and is respectively connected to one end of the second switch S5 and the third end of the high-voltage battery pack, the other end of the second switch S5 serves as the second end of the switch unit and is connected to the motor, the other end of the third switch S6 serves as the third end of the switch unit and 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, the second end of the high-voltage battery pack is respectively connected to the third end of the power unit and the negative electrode of the charging pile through the switch unit, specifically, the second end of the high-voltage battery pack is connected to the fourth end of the switch unit, the fourth end of the switch unit is connected to the fifth end of the switch unit, and the fifth end of the switch unit is then connected to the negative electrode of the charging pile.

[0085] It should be noted that the first switch S4, the second switch S5, the third switch S6 and the fourth switch S7 can be connected to an external control circuit or a controller or control module provided in the charging control integrated 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.

[0086] It can be understood that the switch unit uses simple switching devices to achieve on-off switching of more charging circuits, so that the charging pile can charge the high-voltage battery pack in more different modes, which is easy to operate, simple in control logic and low in cost.

[0087] In a possible implementation, Figure 7 As shown, the high-voltage battery pack may include a power battery B1, a first main switch S1 and a second main switch S3; the positive electrode of the power battery B1 is the third end of the high-voltage battery pack, connected to the other end of the fourth switch S7, 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, connected to the other end of the third switch S6, the negative electrode of the power battery B1 is connected to one end of the second main switch S3, the other end of the second main switch S3 is the second end of the high-voltage battery pack, and is respectively connected to the third end of the power unit and the negative electrode of the charging pile through the switch unit.

[0088] 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 third 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.

[0089] In a specific implementation manner, Figure 8 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 switch S4, the fourth switch S7, the second switch S5, the motor, the power unit, the first main switch S1, the power battery B1, and the second main switch S3 in sequence and then returns to the negative electrode - of the charging pile; Fig. 9 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 first switch S4, the third switch S6, the first main switch S1, the power battery B1, and the second main switch S3 in sequence; Fig.10 As shown, 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 first switch S4, the third switch S6, the power unit, the motor, the second switch S5, the power battery B1 and the second main switch S3 in sequence.

[0090] Alternatively, if Figure 7 As shown, the integrated controller may further include a filtering module, the filtering module may adopt an EMC filter, and the EMC filter may further include a first filtering unit and a second filtering unit (not shown in the figure), and the second filtering unit may implement EMC filtering in the boost charging mode and the boost current charging mode; the switch unit may include a pre-charge capacitor Cin and a power inductor, and the other end of the second switch S5 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 when the boost charging circuit and the boost current charging circuit are connected; 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.

[0091] For example, refer to Fig.11 , Fig.11 This is an application example diagram of this embodiment, and a specific application example is proposed. Among them, the integrated controller is directly connected to the fast charging port of the vehicle, and the fast charging port is connected to the external DC charging pile; the integrated controller specifically sets a fast charging / boosting / current boosting interface and a PN / current boosting interface, and the fast charging / boosting / current boosting interface corresponds to Figure 7The eBoost+ / FC+ and FC- ports in the fast charge port can be connected to the fast charge / boost / boost interface of the integrated controller through a fast charge / boost / boost cable; the high-voltage battery pack specifically sets a PN interface, and the PN / boost interface of the integrated controller corresponds to Figure 7 The ports eBuck+, P and N in the high-voltage battery pack correspond to the PN interface of Figure 7 The positive electrode of the middle power battery B1, the other end of the first main switch S1 and the other end of the second main switch S3, the PN / boost interface of the integrated controller is connected to the PN interface of the high-voltage battery pack through the PN / boost cable. Among them, the fast charge / boost / boost cable between the integrated controller and the fast charge port can use a two-wire cable, and the PN / boost cable between the integrated controller and the high-voltage battery pack can use a three-wire cable to further normalize and simplify the wiring harness between the high-voltage battery pack and the all-in-one integrated controller, and realize a more integrated circuit design.

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

[0093] Control S1 and S3 to close, and the other switches to open, the normal drive circuit is connected, and the circuit enters the normal drive mode. When the circuit is connected, the corresponding current trend is B1+→S1→power unit→motor→S3→B1-;

[0094] Control S1, S3, S4, S5, and S7 to be closed, and the other switches to be disconnected, the boost charging circuit is connected, and the circuit enters the boost charging mode. When the circuit is connected, it is divided into an inductive energy storage process and a boost charging process. The current trend corresponding to the inductive energy storage process is, charging pile +→S4→S7→S5→motor→Q4 / Q5 / Q6→charging pile-, and the current trend corresponding to the boost charging process is, charging pile +→S4→S7→S5→motor→Q1 / Q2 / Q3→S1→B1→S3→charging pile-, such as Figure 8 As shown;

[0095] Control S1, S3, S4, and S6 to close, and the other switches to open, the DC fast charging circuit is connected, and the circuit enters the DC fast charging mode. When the circuit is connected, the corresponding current trend is charging pile +→S4→S6→S1→B1→S3→charging pile-, such as Fig. 9 shown.

[0096] Control S3, S4, S5, and S6 to close, and the other switches to open, the boost charging loop is connected, and the circuit enters the boost charging mode. When the loop is connected, it is divided into an inductive energy storage process and a buck charging process. The current trend corresponding to the inductive energy storage process is charging pile +→S4→S6→Q1 / Q2 / Q3→motor→S5→B1→S3→charging pile-, such as Fig.10As shown, the current trend corresponding to the step-down charging process is charging pile +→S4→S6→Q4 / Q5 / Q6→motor→S5→B1→S3→charging pile-.

[0097] The charging control integrated 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 wiring harness layout of the whole vehicle, realize integrated circuit design, solve the problem of long charging time for users, and deeply explore the whole vehicle cost reduction solution for OEMs, and further provide means for the miniaturization, lightweight and low cost of the integration of high-voltage components of the whole vehicle.

[0098] In the related art, many vehicles determine the power and voltage level of OBC (On-board charger) according to the market segment, and AC slow charging still accounts for a large proportion in the current home charging scenario. Therefore, when the aforementioned embodiment is applied to electric vehicles so that they can meet the DC charging scenario, it is also necessary to take into account the AC charging scenarios of different voltage / power levels, so that vehicle charging can cover more charging scenarios including fast charging and slow charging, for example, compatible with single-phase and three-phase slow charging scenarios. Based on this, the present application also proposes a charging control integrated circuit.

[0099] In another embodiment of the charging control integrated 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. Fig.12 , Fig.12 This is a connection diagram of another embodiment of a charging control integrated circuit, the charging control integrated circuit is connected to a DC charging pile and an AC charging pile respectively, the charging control integrated circuit includes a high-voltage battery pack, a low-voltage battery pack and an integrated controller, the integrated controller includes a DC charging module, an AC charging module and a motor, the DC charging module includes a power unit and a switch unit, and the AC charging module includes an OBC unit and a DCDC conversion unit;

[0100] The power unit is connected to the high-voltage battery pack and the motor respectively, and the switch unit is connected to the DC charging pile, the high-voltage battery pack and the motor respectively; the OBC unit is connected to the AC charging pile, the high-voltage battery pack and the DCDC conversion unit respectively, and the DCDC conversion unit is connected to the low-voltage battery pack;

[0101] Among them, the switch unit is used to switch on different charging circuits according to its own on and off, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of an AC slow charging circuit, a DC fast charging circuit, a DC boost charging circuit and a DC current boost charging circuit.

[0102] It should be noted that the low-voltage battery pack refers to the low-voltage battery of the entire electric vehicle, which supplies power to various low-voltage devices in the electric vehicle. The low-voltage battery pack is also part of the entire vehicle and is installed in the electric vehicle. The integrated controller can be a motor controller that drives and controls the motor, such as Xin1. The DC charging module and the AC charging module are both part of the integrated controller.

[0103] It should also be noted that the AC charging module includes an OBC unit and a DCDC conversion unit. The OBC unit can be connected to the AC charging pile through a single-phase or three-phase connection to receive single-phase or three-phase AC power. The OBC unit refers to a power electronic device that uses high-frequency switching power supply technology to convert alternating current (AC) into direct current (DC). The DCDC conversion unit is used to convert the received DC power into DC power of other voltages to charge the low-voltage battery pack. In actual application, both the OBC unit and the DCDC conversion unit can be implemented by some simple electronic devices or circuit structures so as to be integrated into the motor controller, which is not specifically limited here. In addition, the control of the OBC unit and the DCDC conversion unit can be controlled by an external control circuit according to actual needs, or a separate controller can be set in the charging control integrated circuit or a control module can be set in the integrated controller to achieve control. It can be set according to actual needs and is not specifically limited here.

[0104] In one possible implementation, refer to Fig.13 , Fig.13 : is another connection diagram of the charging control integrated circuit in this embodiment. The integrated controller may further include a filter module; the power unit is connected to the high-voltage battery pack through the filter module, and the switch unit is also connected to the high-voltage battery pack and the DC charging pile respectively through the filter module; the OBC unit is connected to the high-voltage battery pack and the DCDC conversion unit respectively through the filter module;

[0105] The filter module is used to implement electromagnetic compatibility (EMC) filtering in normal driving mode, and to implement EMC filtering in DC boost charging mode and DC current boost charging mode.

[0106] The charging control integrated circuit proposed in this embodiment includes a high-voltage battery pack, a low-voltage battery pack, an integrated controller and a motor. The integrated controller includes a DC charging module and an AC charging module. The DC charging module includes a power unit and a switch unit. The AC charging module includes an on-board charger OBC unit and a DCDC conversion unit, wherein the power unit is connected to the high-voltage battery pack and the motor respectively, the switch unit is connected to the DC charging pile, the high-voltage battery pack and the motor respectively, the OBC unit is connected to the AC charging pile, the high-voltage battery pack and the DCDC conversion unit respectively, and the DCDC conversion unit is connected to the low-voltage battery pack; the motor controller, the motor and the OBC can be reused on the existing system. Only by adding a switch unit inside the motor controller, multiple charging modes can be realized, and corresponding adaptation to AC or DC charging of different voltage levels can be achieved. Pile; the switch unit can connect different charging circuits according to its own on-off switching, so that the charging control integrated circuit enters different charging modes, including switching on any at least two of the AC slow charging circuit, the DC fast charging circuit, the DC boost charging circuit and the DC boost charging circuit. You can use a DC charging pile to charge the high-voltage battery pack and use an AC charging pile to charge the low-voltage battery pack, you can also use an AC charging pile to charge the high-voltage battery pack, you can realize multiple modes of charging for the high-voltage battery pack, 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, and increase the applicability of the circuit. In addition, integrating the above modules and their units into the motor controller to form an integrated controller can increase the circuit integration and save the difficulty and cost of vehicle development.

[0107] In a feasible implementation, the OBC unit may include an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the output end of the AC charging pile, the output end of the AC-DC conversion circuit is respectively connected to the input end of the high-voltage battery pack and the DCDC conversion unit, and the output end of the DCDC conversion unit is connected to the low-voltage battery pack, which may include a low-voltage battery B2. The output end of the AC-DC conversion circuit may also be respectively connected to the high-voltage battery pack and the DCDC conversion unit after passing through an EMC filter.

[0108] It should be noted that the AC-DC conversion circuit is used to convert AC power into DC power, and the DCDC conversion unit is used to convert the voltage of DC power to provide it to the low-voltage battery pack. At this time, the OBC unit belongs to a single-stage topology structure, such as the Supercharger network applicable to Superchargers (supercharging stations). This structure has the advantages of efficient and fast charging, intelligent distribution and dynamic management, which can ensure the maximization of charging efficiency and improve the charging experience of car owners.

[0109] In another possible implementation, referring to Fig.14 , Fig.14This is a detailed connection diagram of the charging control integrated circuit in this embodiment. The OBC unit may include an AC-DC conversion circuit and a voltage stabilization and electrical isolation circuit. The input end of the AC-DC conversion circuit is connected to the output end of the AC charging pile, and the output end of the AC-DC conversion circuit is connected to the input end of the voltage stabilization and electrical isolation circuit. The output end of the voltage stabilization and electrical isolation circuit is respectively connected to the input end of the high-voltage battery pack and the DCDC conversion unit, and the output end of the DCDC conversion unit is connected to the low-voltage battery pack. The low-voltage battery pack may include a low-voltage battery B2. The output end of the voltage stabilization and electrical isolation circuit may also be connected to the high-voltage battery pack and the DCDC conversion unit respectively after passing through an EMC filter.

[0110] It should be noted that the AC-DC conversion circuit is used to convert AC power into DC power, the voltage stabilization and electrical isolation circuit is used to stabilize the DC power and transmit it in electrical isolation, and the DCDC conversion unit is used to convert the voltage of DC power to provide it to the low-voltage battery pack. At this time, the OBC unit belongs to a two-level topology structure, which can overcome the voltage difference, increase the charging voltage and ensure the charging efficiency. It also has the advantage of good stability and can achieve optimal performance in both efficiency and voltage stability. In practical applications, the AC-DC conversion circuit and the voltage stabilization and electrical isolation circuit can be implemented by circuits composed of conventional electronic devices, or by integrated chips, etc., which are not specifically limited here.

[0111] In a possible implementation, Fig.14 As shown, the charging mode of the charging control integrated circuit may include an AC slow charging mode and a DC fast charging mode; correspondingly, the charging circuit may include an AC slow charging circuit and a DC fast charging circuit, the AC charging pile, the OBC unit and the high-voltage battery pack constitute the AC slow charging circuit, the DC charging pile, the switch unit and the high-voltage battery pack constitute the DC fast charging circuit, and the switch unit is also used to switch on the AC slow charging circuit or the DC fast charging circuit;

[0112] Among them, when the AC slow charging circuit is connected, the current output from the positive pole of the AC charging pile passes through the OBC unit, the high-voltage battery pack and the OBC unit in sequence and then returns to the negative pole of the AC charging pile; when the DC fast charging circuit is connected, the current output from the positive pole of the DC charging pile passes through the switch unit, the high-voltage battery pack and the switch unit in sequence and then returns to the negative pole of the DC charging pile.

[0113] Reference Fig.15 , Fig.15 Schematic diagram of the current flow of the AC slow charging circuit in this embodiment. The AC charging pile, the OBC unit and the high-voltage battery pack form an AC slow charging circuit. When the AC slow charging circuit is connected, the circuit enters the AC slow charging mode. The current output by the positive electrode of the AC charging pile passes through the OBC unit, the high-voltage battery pack and the OBC unit in turn and returns to the negative electrode of the AC charging pile, thereby realizing the AC slow charging of the high-voltage battery pack by the AC charging pile; refer to Fig.16, Fig.16 This is a schematic diagram of the current flow of the DC fast charging circuit in this embodiment. The DC charging pile, the switch unit and the high-voltage battery pack form a DC fast charging circuit. When the DC fast charging circuit is connected, the circuit enters the DC fast charging mode. The current output from the positive electrode of the DC charging pile passes through the switch unit, the high-voltage battery pack and the switch unit in sequence and returns to the negative electrode of the DC charging pile, thereby realizing DC fast charging of the high-voltage battery pack by the DC charging pile.

[0114] Optionally, the connection between the high-voltage battery pack and the OBC unit can be disconnected, so that the connection between the AC charging pile and the high-voltage battery pack is disconnected. At this time, the OBC unit can remain connected to the AC charging pile, so that the connection between the AC charging pile and the low-voltage battery pack is connected, so that the AC charging pile can charge the low-voltage battery pack through the OBC unit and the DCDC switching unit; the connection between the OBC unit and the AC charging pile can be disconnected, so that the connection between the AC charging pile and the high-voltage battery pack and the connection between the AC charging pile and the low-voltage battery pack are both disconnected. At the same time, the switch unit can be completely disconnected, but the connection between the high-voltage battery pack and the integrated controller can be maintained, so that the connection between the DC charging pile and the high-voltage battery pack and the connection between the DC charging pile and the integrated controller are both disconnected, so that the connection between the high-voltage battery pack and the integrated controller is connected, and at this time the high-voltage battery pack can supply power to the motor to make the motor work normally, so that the charging control integrated circuit can switch to normal drive mode.

[0115] It is understandable that the charging control integrated circuit can switch between normal driving mode, AC slow charging mode and DC fast charging mode, wherein the AC slow charging mode can be specifically used in the "car-AC pile" scenario, so that the AC charging pile performs AC slow charging on the high-voltage battery pack; the DC fast charging mode can be specifically used in the "car-ordinary DC pile" voltage matching scenario, so that the voltage-matched DC charging pile performs boost charging on the high-voltage battery pack. Therefore, the circuit can adapt to a variety of charging piles and their corresponding charging scenarios, reuse existing designs, and has both high applicability and cost savings.

[0116] In a possible implementation, Fig.14 As shown, the charging mode of the charging control integrated circuit may include an AC slow charging mode, a DC fast charging mode and a DC boost charging mode; correspondingly, the charging circuit may also include a DC boost charging circuit, and the DC charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack constitute the DC boost charging circuit, and the switch unit is also used to switch on the AC slow charging circuit, the DC fast charging circuit or the DC boost charging circuit;

[0117] Among them, when the DC boost charging circuit is connected, the current output from the positive electrode of the DC charging pile passes through the switch unit, motor, power unit, high-voltage battery pack and switch unit in sequence and then returns to the negative electrode of the DC charging pile.

[0118] Reference Fig.17 , Fig.17 This is a schematic diagram of the current flow of the DC boost charging circuit in this embodiment. The DC charging pile, switch unit, motor, power unit and high-voltage battery pack form a DC boost charging circuit. When the circuit is connected, the circuit enters the DC boost charging mode. The current output from the positive electrode of the DC charging pile passes through the switch unit, motor, power unit, high-voltage battery pack and switch unit in sequence and returns to the negative electrode of the DC charging pile, thereby realizing DC boost charging of the high-voltage battery pack by the DC charging pile.

[0119] It can be understood that the charging control integrated circuit can switch between normal driving mode, AC slow charging mode, DC fast charging mode and DC boost charging mode, among which the DC boost charging mode can be specifically used in the scenario of "car-DC pile" voltage mismatch, so that the DC charging pile can perform DC boost charging on the high-voltage battery pack. Therefore, the circuit can adapt to a variety of charging piles and their corresponding charging scenarios, with high applicability and integration.

[0120] In a possible implementation, Fig.14 As shown, the charging mode of the charging control integrated circuit may include an AC slow charging mode, a DC fast charging mode, a DC boost charging mode and a DC boost current charging mode; correspondingly, the charging circuit may also include a DC boost current charging circuit, and the DC charging pile, the switch unit, the power unit, the motor and the high-voltage battery pack constitute the DC boost current charging circuit, and the switch unit is also used to switch on the AC slow charging circuit, the DC fast charging circuit or the DC boost current charging circuit;

[0121] Among them, when the DC boost charging circuit is connected, the current output from the positive electrode of the DC charging pile passes through the switch unit, power unit, motor, switch unit, high-voltage battery pack and switch unit in sequence and then returns to the negative electrode of the DC charging pile.

[0122] Reference Fig.18 , Fig.18 This is a schematic diagram of the current flow of the DC boost charging circuit in this embodiment. The DC charging pile, the switch unit, the power unit, the motor and the high-voltage battery pack form a DC boost charging circuit. When the circuit is connected, the circuit enters the DC boost charging mode. The current output from the positive electrode of the DC charging pile passes through the switch unit, the power unit, the motor, the switch unit, the high-voltage battery pack and the switch unit in turn and returns to the negative electrode of the DC charging pile, thereby realizing the DC boost charging of the high-voltage battery pack by the DC charging pile.

[0123] It is understandable that the charging control integrated circuit can switch between normal driving mode, AC slow charging mode, DC fast charging mode, DC boost charging mode and DC boost charging mode, among which the DC boost charging mode can be specifically used for the high-current fast charging scenario when the "car-supercharged DC pile" voltage matches, so that the DC charging pile can perform DC boost charging on the high-voltage battery pack. Therefore, the circuit can adapt to a variety of charging piles and their corresponding more different charging scenarios, further improving the applicability and integration of the circuit.

[0124] In a possible implementation, Fig.14 As shown, the switch unit may include a first switch S4, a second switch S5, a third switch S6 and a fourth switch S7;

[0125] Among them, one end of the first switch S4 serves as the first end of the switch unit and is connected to the positive electrode of the DC charging pile. The other end of the first switch S4 is respectively connected to one end of the third switch S6 and one end of the fourth switch S7. The other end of the fourth switch S7 serves as the sixth end of the switch unit and is respectively connected to one end of the second switch S5 and the third end of the high-voltage battery pack. The other end of the second switch S5 serves as the second end of the switch unit and is connected to the motor. The other end of the third switch S6 serves as the third end of the switch unit and is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit. The first end of the high-voltage battery pack is also connected to the first end of the OBC unit, the first end of the OBC unit is also connected to the first end of the DCDC conversion unit, the second end of the power unit is connected to the motor, and the second end of the high-voltage battery pack is respectively connected to the second end of the OBC unit, the third end of the power unit and the negative electrode of the DC charging pile through the switch unit. Specifically, the second end of the high-voltage battery pack is connected to the fourth end of the switch unit, the fourth end of the switch unit is connected to the fifth end of the switch unit, the fifth end of the switch unit is then connected to the negative electrode of the DC charging pile, and the second end of the OBC unit is also connected to the second end of the DCDC conversion unit. The third end of the OBC unit is connected to the positive pole of the AC charging pile, the fourth end of the OBC unit is connected to the negative pole of the AC charging pile, the third end of the DCDC conversion unit is connected to the positive pole of the low-voltage battery pack, and the fourth end of the DCDC conversion unit is connected to the negative pole of the low-voltage battery pack.

[0126] It should be noted that the first switch S4, the second switch S5, the third switch S6 and the fourth switch S7 can be connected to an external control circuit or a controller or control module provided in the charging control integrated 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.

[0127] It can be understood that the switch unit uses simple switching devices to achieve on-off switching of more charging circuits, and can use AC charging piles or DC charging piles to realize more different charging modes for high-voltage battery packs. It is easy to operate, has simple control logic and low cost.

[0128] In a possible implementation, Fig.14 As shown, the high-voltage battery pack may include a power battery, B1, a first main switch S1 and a second main switch S3;

[0129] The positive electrode of the power battery B1 is the third end of the high-voltage battery pack and is connected to the other end of the fourth switch S7. 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, which is respectively connected to the other end of the third switch S6 and the first end of the OBC unit. The negative electrode of the power battery B1 is connected to one end of the second main switch S3. The other end of the second main switch S3 is the second end of the high-voltage battery pack, which is respectively connected to the second end of the OBC unit, the third end of the power unit and the negative electrode of the DC charging pile through the switch unit.

[0130] In a specific implementation manner, Fig.15 As shown, when the AC slow charging circuit is connected, the current output by the positive electrode L of the AC charging pile returns to the negative electrode N of the AC charging pile after passing through the AC-DC conversion circuit and voltage stabilization and electrical isolation circuit of the OBC unit, the first main switch S1, the power battery B1, the second main switch S3, the voltage stabilization and electrical isolation circuit and the AC-DC conversion circuit of the OBC unit; Fig.16 As shown, when the DC fast charging circuit is connected, the current output from the positive electrode + of the DC charging pile returns to the negative electrode - of the DC charging pile after passing through the first switch S4, the third switch S6, the first main switch S1, the power battery B1 and the second main switch S3 in sequence; Fig.17 As shown, when the DC boost charging circuit is turned on, the current output from the positive electrode + of the DC charging pile passes through the first switch S4, the fourth switch S7, the second switch S5, the motor, the power unit, the first main switch S1, the power battery B1 and the second main switch S3 in sequence and then returns to the negative electrode - of the DC charging pile; Fig.18 As shown, when the DC boost charging circuit is connected, the current output from the positive electrode + of the DC charging pile returns to the negative electrode - of the DC charging pile after passing through the first switch S4, the third switch S6, the power unit, the motor, the second switch S5, the power battery B1 and the second main switch S3 in sequence.

[0131] Alternatively, if Fig.14As shown, the high-voltage battery pack may further include a fuse F1, a pre-charging resistor R1 and a pre-charging switch S2; the integrated controller may further include a filtering module, the filtering module may adopt an EMC filter, and the EMC filter may further include a first filtering unit and a second filtering unit (not shown in the figure), and the second filtering unit may implement EMC filtering in a DC boost charging mode and a DC boost current charging mode; the switch unit may include a pre-charging capacitor Cin and a power inductor, and the other end of the second switch S5 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 when the DC boost charging circuit and the DC boost current charging circuit are connected; the power unit may include a bus capacitor Cap and power tubes Q1~Q6. For more specific implementations, please refer to the previous description and will not be repeated here.

[0132] For example, refer to Fig.19 , Fig.19 This is an application example diagram of this embodiment, and a specific application example is proposed. Among them, the integrated controller is connected to the fast charging port and slow charging port of the vehicle respectively, the fast charging port is connected to the external DC charging pile, and the slow charging port is connected to the external AC charging pile; the integrated controller specifically sets three interfaces, namely the slow charging interface, the fast charging / boosting / current boosting interface and the PN / current boosting / boosting / slow charging interface, and the slow charging interface corresponds to Fig.14 Port L and port N connected to the OBC unit, the slow charge port can be connected to the slow charge port of the integrated controller through a slow charge cable, and the fast charge / boost / current boost port corresponds to Fig.14 The eBoost+ / FC+ and FC- ports in the high-voltage battery pack are connected to the fast-charge / boost / boost interface of the integrated controller through the fast-charge / boost / boost cable. The high-voltage battery pack specifically sets the PN interface, and the PN / boost / boost / slow-charge interface of the integrated controller corresponds to Fig.14 The ports eBuck+, P and N in the high-voltage battery pack correspond to the PN interface of Fig.14 The positive electrode of the middle power battery B1, the other end of the first main switch S1 and the other end of the second main switch S3, the PN / current boost / voltage boost / slow charging interface of the integrated controller are connected to the PN interface of the high-voltage battery pack through the PN / current boost / voltage boost / slow charging cable. Among them, the slow charging cable between the integrated controller and the slow charging port and the fast charging / voltage boost / current boost cable between the integrated controller and the fast charging port can all use two-wire cables, and the PN / current boost / voltage boost / slow charging cable between the integrated controller and the high-voltage battery pack can use three-wire cables to further normalize and simplify the wiring harness between the high-voltage battery pack and the all-in-one integrated controller, and realize a more integrated circuit design.

[0133] In this application example, the specific working process includes:

[0134] When the OBC unit is not connected to the AC charging pile, control S1 and S3 to close, and the other switches to open, the normal drive circuit is connected, and the circuit enters the normal drive mode. When the circuit is connected, the corresponding current trend is B1+→S1→power unit→motor→S3→B1-;

[0135] When the OBC unit is connected to the AC charging pile, control S1 and S3 to close, and the other switches to open, the AC slow charging circuit is connected, and the circuit enters the AC slow charging mode. When the circuit is connected, the corresponding current trend is AC charging pile L→OBC unit→S1→B1→S3→OBC unit→AC charging pile N. Fig.15 As shown;

[0136] Control S1, S3, S4, and S6 to close, and the other switches to open, the DC fast charging circuit is connected, and the circuit enters the DC fast charging mode. When the circuit is connected, the corresponding current trend is DC charging pile +→S4→S6→S1→B1→S3→DC charging pile-, such as Fig.16 As shown;

[0137] Control S1, S3, S4, S5, and S7 to be closed, and the other switches to be disconnected, the DC boost charging loop is connected, and the circuit enters the DC boost charging mode. When the loop is connected, it is divided into an inductive energy storage process and a boost charging process. The current trend corresponding to the inductive energy storage process is, DC charging pile +→S4→S7→S5→motor→Q4 / Q5 / Q6→DC charging pile-, and the current trend corresponding to the boost charging process is, DC charging pile +→S4→S7→S5→motor→Q1 / Q2 / Q3→S1→B1→S3→DC charging pile-, such as Fig.17 As shown;

[0138] Control S3, S4, S5, and S6 to close, and the other switches to open, the DC boost charging loop is connected, and the circuit enters the DC boost charging mode. When the loop is connected, it is divided into an inductive energy storage process and a buck charging process. The current trend corresponding to the inductive energy storage process is, DC charging pile +→S4→S6→Q1 / Q2 / Q3→motor→S5→B1→S3→DC charging pile-, such as Fig.18 As shown, the current trend corresponding to the step-down charging process is DC charging pile +→S4→S6→Q4 / Q5 / Q6→motor→S5→B1→S3→DC charging pile-.

[0139] The charging control integrated circuit proposed in this embodiment can realize arbitrary switching between normal driving mode, AC slow charging mode, DC fast charging mode, DC boost charging mode and DC boost charging mode, taking into account the different scenarios of AC charging piles and DC charging piles, as well as the application requirements of more scenarios such as "car-ordinary pile" voltage matching, "car-pile" voltage mismatch, "car-super charging pile" voltage matching, etc., and can cover more application scenarios where vehicles with different voltages and power levels are arbitrarily matched with different charging piles. At the same time, it can also streamline the wiring harness layout of the whole vehicle and realize integrated circuit design, which can provide OEMs with in-depth exploration of the whole vehicle cost reduction plan and further provide means for the miniaturization, lightweight and low cost of the integration of high-voltage components of the whole vehicle.

[0140] The present application also proposes a control method for a charging control integrated circuit.

[0141] In one embodiment of the control method of the charging control integrated circuit of the present application, the control method is applied to the above-mentioned charging control integrated circuit, and the control method includes step S1:

[0142] Step S1, switching on different charging circuits through the switch unit according to its own on and off, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of a boost charging circuit, a DC fast charging circuit and a current boost charging circuit.

[0143] In a feasible implementation, step S1 may include step S11 or S12:

[0144] Step S11, controlling the first switch and the second switch to be closed and the third switch to be opened, so that the boost charging circuit is turned on;

[0145] Step S12, controlling the first switch and the third switch to close and the second switch to open, so that the DC fast charging circuit is connected.

[0146] 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.

[0147] In a feasible implementation, step S1 may include any one of steps S21 to S23:

[0148] Step S21, controlling the first switch, the second switch and the fourth switch to be closed, and the third switch to be opened, so that the boost charging circuit is connected;

[0149] Step S22, controlling the first switch and the third switch to be closed, and the second switch and the fourth switch to be opened, so that the DC fast charging circuit is connected;

[0150] Step S23, controlling the first switch, the second switch and the third switch to be closed, and the fourth switch to be opened, so that the boost charging loop is connected.

[0151] 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.

[0152] In another embodiment of the control method of the charging control integrated circuit of the present application, the control method is applied to the above-mentioned charging control integrated circuit, and the control method includes step S3:

[0153] Step S3, switching on different charging circuits through the switch unit according to its own on and off, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of an AC slow charging circuit, a DC fast charging circuit, a DC boost charging circuit and a DC current boost charging circuit.

[0154] In a feasible implementation, step S3 may include any one of steps S31 to S34:

[0155] Step S31, controlling the first switch, the second switch, the third switch and the fourth switch to be disconnected, so that the AC slow charging circuit is connected;

[0156] Step S32, controlling the first switch and the third switch to be closed, and the second switch and the fourth switch to be opened, so that the DC fast charging circuit is connected;

[0157] Step S33, controlling the first switch, the second switch and the fourth switch to be closed, and the third switch to be opened, so that the DC boost charging circuit is connected;

[0158] Step S34, controlling the first switch, the second switch and the third switch to be closed, and the fourth switch to be opened, so that the DC boost charging circuit is connected.

[0159] 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 S31 can be switched to the execution of any other step, and steps S31-S34 will not be executed at the same time.

[0160] It should be noted that the specific implementation of the charging control integrated circuit refers to the above-mentioned embodiments. Since the control method of the charging control integrated circuit adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0161] The application also proposes an electric car.

[0162] In one embodiment of the electric vehicle of the present application, the electric vehicle may include a charging control integrated circuit.

[0163] Optionally, the electric vehicle may also include a vehicle controller connected to the charging control integrated circuit, specifically connected to the switch unit and each switch in the high-voltage battery pack, and connected to the gate of each power tube in the power unit, to achieve switch control and pulse signal control of the power tube, which is not specifically limited here. Among them, the vehicle controller can implement the steps of the control method of the above-mentioned charging control integrated circuit.

[0164] It should be noted that the specific implementation methods of the charging control integrated 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 repeated here one by one.

[0165] 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 integrated circuit, suitable for connecting to a charging pile, characterized in that: The charging control integrated circuit includes a high-voltage battery pack and an integrated controller, the integrated controller includes a DC charging module and a motor, and the DC charging module includes a power unit and a switch unit; The power unit is connected to the high-voltage battery pack and the motor respectively, and the switch unit is connected to the charging pile, the high-voltage battery pack and the motor respectively; The switch unit is used to switch on different charging circuits according to its own on and off state, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of a boost charging circuit, a DC fast charging circuit and a current boost charging circuit.

2. The charging control integrated circuit according to claim 1, characterized in that: The charging circuit includes a boost charging circuit and a DC fast charging circuit. The charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack constitute the boost charging circuit, and the charging pile, the switch unit and the high-voltage battery pack constitute the DC fast charging circuit. The switch unit is also used to switch on the boost charging circuit or the DC fast charging circuit; Wherein, 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 switch unit, the motor, the power unit, the high-voltage battery pack and the switch unit 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 switch unit, the high-voltage battery pack and the switch unit in sequence.

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

4. The charging control integrated 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 switch, the negative electrode of the power battery is 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 negative electrode of the charging pile.

5. The charging control integrated circuit according to claim 4, characterized in that: 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 first switch, the second switch, the motor, the power unit, the first main switch, the power battery, and the second main switch in sequence; 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 first switch, the third switch, the first main switch, the power battery, and the second main switch in sequence.

6. The charging control integrated circuit according to claim 2, characterized in that: The charging circuit also includes a current-boosting charging circuit, and the charging pile, the switch unit, the power unit, the motor and the high-voltage battery pack constitute the current-boosting charging circuit; The switch unit is also used to switch on the boost charging circuit, the DC fast charging circuit or the boost charging circuit; Among them, when the current-boosting 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 switch unit, the power unit, the motor, the switch unit, the high-voltage battery pack and the switch unit in sequence.

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

8. The charging control integrated circuit according to claim 7, 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 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 switch, the negative electrode of the power battery is 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 negative electrode of the charging pile.

9. The charging control integrated circuit according to claim 8, characterized in that: 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 first switch, the fourth switch, the second switch, the motor, the power unit, the first main switch, the power battery, and the second main switch 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 first switch, the third switch, the first main switch, the power battery, and the second main switch in sequence; 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 through the first switch, the third switch, the power unit, the motor, the second switch, the power battery and the second main switch in sequence.

10. A charging control integrated circuit, characterized in that: They are connected to a DC charging pile and an AC charging pile respectively, the charging control integrated circuit includes a high-voltage battery pack, a low-voltage battery pack and an integrated controller, the integrated controller includes a DC charging module, an AC charging module and a motor, the DC charging module includes a power unit and a switch unit, and the AC charging module includes an OBC unit and a DCDC conversion unit; The power unit is connected to the high-voltage battery pack and the motor respectively, and the switch unit is connected to the DC charging pile, the high-voltage battery pack and the motor respectively; the OBC unit is connected to the AC charging pile, the high-voltage battery pack and the DCDC conversion unit respectively, and the DCDC conversion unit is connected to the low-voltage battery pack; The switch unit is used to switch on different charging circuits according to its own on and off state, so that the charging control integrated circuit enters different charging modes; wherein the charging circuit includes any at least two of an AC slow charging circuit, a DC fast charging circuit, a DC boost charging circuit and a DC current boost charging circuit.

11. The charging control integrated circuit according to claim 10, characterized in that: The charging circuit includes the AC slow charging circuit and the DC fast charging circuit, the AC charging pile, the OBC unit and the high-voltage battery pack constitute the AC slow charging circuit, and the DC charging pile, the switch unit and the high-voltage battery pack constitute the DC fast charging circuit; The switch unit is also used to switch on the AC slow charging circuit or the DC fast charging circuit; Wherein, when the AC slow charging circuit is connected, the current output from the positive electrode of the AC charging pile returns to the negative electrode of the AC charging pile after passing through the OBC unit, the high-voltage battery pack and the OBC unit in sequence; When the DC fast charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile after passing through the switch unit, the high-voltage battery pack and the switch unit in sequence.

12. The charging control integrated circuit according to claim 11, characterized in that: The charging circuit also includes the DC boost charging circuit, and the DC charging pile, the switch unit, the motor, the power unit and the high-voltage battery pack constitute the DC boost charging circuit; The switch unit is also used to switch on the AC slow charging circuit, the DC fast charging circuit or the DC boost charging circuit; Among them, when the DC boost charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile after passing through the switch unit, the motor, the power unit, the high-voltage battery pack and the switch unit in sequence.

13. The charging control integrated circuit according to claim 11, characterized in that: The charging circuit also includes the DC boost charging circuit, and the DC charging pile, the switch unit, the power unit, the motor and the high-voltage battery pack constitute the DC boost charging circuit; The switch unit is also used to switch on the AC slow charging circuit, the DC fast charging circuit or the DC boost charging circuit; Among them, when the DC boost charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile after passing through the switch unit, the power unit, the motor, the switch unit, the high-voltage battery pack and the switch unit in sequence.

14. The charging control integrated circuit according to any one of claims 11 to 13, characterized in that: The switch unit includes a first switch, a second switch, a third switch and a fourth switch; One end of the first switch is connected to the positive electrode of the DC charging pile, the other end of the first switch is respectively connected to one end of the third switch and one end of the fourth switch, the other end of the fourth switch is respectively connected to one end of the second switch and the third end of the high-voltage battery pack, the other end of the second switch is connected to the motor, the other end of the third switch is respectively connected to the first end of the high-voltage battery pack and the first end of the power unit, the first end of the high-voltage battery pack is also connected to the first end of the OBC unit, the second end of the power unit is connected to the motor, and the second end of the high-voltage battery pack is respectively connected to the second end of the OBC unit, the third end of the power unit and the negative electrode of the DC charging pile.

15. The charging control integrated circuit according to claim 14, 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 switch, and 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 respectively connected to the other end of the third switch and the first end of the OBC unit. The negative electrode of the power battery is connected to one end of the second main switch, and the other end of the second main switch is respectively connected to the second end of the OBC unit, the third end of the power unit and the negative electrode of the DC charging pile.

16. The charging control integrated circuit according to claim 15, characterized in that: When the AC slow charging circuit is connected, the current output from the positive electrode of the AC charging pile returns to the negative electrode of the AC charging pile after passing through the OBC unit, the first main switch, the power battery, the second main switch and the OBC unit in sequence; When the DC fast charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile through the first switch, the third switch, the first main switch, the power battery and the second main switch in sequence; When the DC boost charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile through the first switch, the fourth switch, the second switch, the motor, the power unit, the first main switch, the power battery and the second main switch in sequence; When the DC boost charging circuit is turned on, the current output from the positive electrode of the DC charging pile returns to the negative electrode of the DC charging pile through the first switch, the third switch, the power unit, the motor, the second switch, the power battery and the second main switch in sequence.

17. A control method for a charging control integrated circuit, characterized in that: Applied to the charging control integrated circuit according to claim 3 or 4, the control method comprises: The first switch and the second switch are controlled to be closed, and the third switch is controlled to be opened, so that the boost charging circuit is connected; or the first switch and the third switch are controlled to be closed, and the second switch is controlled to be opened, so that the DC fast charging circuit is connected.

18. A control method for a charging control integrated circuit, characterized in that: Applied to the charging control integrated circuit according to claim 7 or 8, the control method comprises: Control the first switch, the second switch and the fourth switch to be closed, and the third switch to be opened, so that the boost charging circuit is connected; control the first switch and the third switch to be closed, and the second switch and the fourth switch to be opened, so that the DC fast charging circuit is connected; or control the first switch, the second switch and the third switch to be closed, and the fourth switch to be opened, so that the boost charging circuit is connected.

19. A control method for a charging control integrated circuit, characterized in that: Applied to the charging control integrated circuit according to claim 14 or 15, the control method comprises: Control the first switch, the second switch, the third switch and the fourth switch to be disconnected to connect the AC slow charging circuit; control the first switch and the third switch to be closed, and the second switch and the fourth switch to be disconnected to connect the DC fast charging circuit; control the first switch, the second switch and the fourth switch to be closed, and the third switch to be disconnected to connect the DC boost charging circuit; or control the first switch, the second switch and the third switch to be closed, and the fourth switch to be disconnected to connect the DC boost charging circuit.

20. An electric vehicle, characterized in that: The invention comprises a charging control integrated circuit as claimed in any one of claims 1 to 16.

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