Current-rising charging device, current-rising charging control method and new energy vehicle

Abstract

The invention discloses a current-rising charging device, a current-rising charging control method and a new energy vehicle, and relates to the technical field of electric driving systems, and the current-rising charging device comprises a first switch module which is connected with a charging module and a motor control module; one end of the second switch module is connected with the battery module, and the other end is respectively connected with the third switch module and a three-phase winding neutral point of the motor; the third switch module is connected with the motor control module; the fourth switch module is connected between the charging module and the battery module; the motor control module is respectively connected with the battery module and the motor; a motor; the first switch module, the second switch module, the third switch module and the fourth switch module control the first switch module, the second switch module, the fourth switch module, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by regulating and controlling respective on-off states. And the charging current output by the charging module to the battery module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive systems, and in particular to a boost charging device, a boost charging control method and a new energy vehicle. Background Art

[0002] DC charging has become a mainstream charging method for new energy vehicles due to its advantages such as high charging power and fast energy replenishment. When charging the battery of a new energy vehicle using DC charging, the battery charging voltage is generally the voltage between the positive and negative electrodes of the battery, and the battery charging current is generally the charging current limited by the charging pile.

[0003] However, with the development of battery technology, the maximum charging current that most charging piles on the market can provide is much lower than the maximum charging current that the battery can withstand. In this case, if the voltage between the positive and negative electrodes of the battery is low, the charging power output by the charging pile to the battery during the actual charging process will be much lower than the maximum output power of the charging pile, which will limit the charging rate of the battery and cause the charging time to be unnecessarily extended. Summary of the invention

[0004] The main purpose of the present application is to provide a current-boosting charging device, which aims to solve the problem of low battery charging rate caused by the limitation of the charging capacity of the charging pile.

[0005] To achieve the above-mentioned purpose, the present application proposes a current boosting charging device, which includes a first switch module, a second switch module, a third switch module, a fourth switch module, a motor control module and a motor;

[0006] The first switch module is respectively connected to the charging module and the motor control module, one end of the second switch module is connected to the battery module, the other end of the second switch module is respectively connected to the third switch module and the neutral point of the three-phase winding of the motor, the third switch module is connected to the motor control module, the fourth switch module is connected between the charging module and the battery module, and the motor control module is respectively connected to the battery module and the motor;

[0007] After receiving the boost charging signal, the first switch module, the second switch module, the third switch module and the fourth switch module control the first switch module, the second switch module, the fourth switch module, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by adjusting their respective switch states, so as to increase the charging current output by the charging module to the battery module based on the step-down circuit.

[0008] In one embodiment, the first switch module includes a first relay, the second switch module includes a second relay and a fourth relay, the third switch module includes a third relay, and the fourth switch module includes a fifth relay and a sixth relay;

[0009] The first relay is respectively connected to the charging module and the motor control module, the second relay is respectively connected to the battery module and the third relay, the third relay is connected to the motor control module, one end of the fourth relay is connected to the neutral point of the three-phase winding of the motor, and the other end of the fourth relay is connected between the second relay and the third relay, one end of the fifth relay is respectively connected to the charging module and the first relay, and the other end of the fifth relay is respectively connected to the battery module and the second relay, one end of the sixth relay is connected to the charging module, and the other end of the sixth relay is respectively connected to the battery module and the motor control module;

[0010] After receiving the boost charging signal, the first relay, the second relay, the third relay, the fourth relay, the fifth relay and the sixth relay control the first relay, the second relay, the fourth relay, the sixth relay, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by adjusting their respective switch states.

[0011] In one embodiment, the first switch module further includes a battery heating unit connected in parallel with the first relay;

[0012] After receiving the battery heating signal, the battery heating unit is used to form a battery heating circuit with the charging module, the battery module, the second relay, the fourth relay, the sixth relay, the motor control module and the motor.

[0013] In one embodiment, the battery heating unit includes a seventh relay and a diode;

[0014] One end of the seventh relay is respectively connected to one end of the first relay and the charging module, the other end of the seventh relay is connected to the anode of the diode, and the cathode of the diode is respectively connected to the other end of the first relay and the motor control module.

[0015] In one embodiment, the second switch module further includes a pre-charging unit connected in parallel with the second relay;

[0016] After receiving the battery charging signal, the pre-charging unit is used to form a pre-charging loop with the second relay, the fifth relay, the sixth relay, the charging module and the battery module.

[0017] In one embodiment, the pre-charging unit includes an eighth relay and a pre-charging resistor;

[0018] One end of the eighth relay is connected to one end of the second relay and the battery module respectively, the other end of the eighth relay is connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is connected to the other end of the second relay.

[0019] In one embodiment, the boost charging device further includes a first voltage stabilizing module and a second voltage stabilizing module;

[0020] One end of the first voltage stabilizing module is connected between the second switch module and the third switch module, and the other end of the first voltage stabilizing module is connected to the battery module and the motor control module respectively; one end of the second voltage stabilizing module is connected to the positive electrode of the motor control module, and the other end of the second voltage stabilizing module is connected to the negative electrode of the motor control module;

[0021] The first voltage stabilizing module and the second voltage stabilizing module are used to stabilize the charging voltage output by the charging module to the battery module.

[0022] To achieve the above object, the present application also provides a boost charging control method, which is applied to the above boost charging device, and the method includes:

[0023] According to the received boost charging signal, the switch states of the first switch module, the second switch module, the third switch module and the fourth switch module of the boost charging device are adjusted to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor of the boost charging device to form a step-down circuit with the charging module and the battery module;

[0024] Based on the step-down circuit, the inductance of the motor is controlled to be in a charging state and a discharging state in sequence, so as to increase the charging current output by the charging module to the battery module.

[0025] In one embodiment, the step of regulating the switch states of the first switch module, the second switch module, the third switch module and the fourth switch module of the boost charging device according to the received boost charging signal to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor of the boost charging device to form a step-down circuit with the charging module and the battery module includes:

[0026] According to the received boost charging signal, the first switch module, the relay in the second switch module, and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in a closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in an open state, so as to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor to form a step-down circuit with the charging module and the battery module.

[0027] In one embodiment, the step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit includes:

[0028] After the buck circuit is formed, the opening and closing of each switch tube of the inverter in the motor control module are dynamically controlled based on the PWM signal, so as to control the inductance of the motor to be in a charging state and a discharging state in turn based on the buck circuit.

[0029] In one embodiment, when the first switch module, the second switch module and the third switch module are all connected to the positive electrode of the motor control module, the step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit includes:

[0030] After the buck circuit is formed, during the high level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a charging state based on the buck circuit;

[0031] During the low level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is controlled to be closed, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

[0032] In one embodiment, when the first switch module, the second switch module and the third switch module are all connected to the negative electrode of the motor control module, the step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit includes:

[0033] After the buck circuit is formed, during the high level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is controlled to be closed, so as to control the inductance of the motor to be in a charging state based on the buck circuit;

[0034] During the low level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

[0035] In one embodiment, when the vehicle to which the boost charging device belongs is in a driving state, the method further includes:

[0036] By controlling the first switch module, the relay in the fourth switch module, and the relay in the second switch module connected to the neutral point of the three-phase winding of the motor to be in an open state, and controlling the relay in the second switch module that is not connected to the neutral point of the three-phase winding of the motor and the relay in the third switch module to be in a closed state, the battery module, the second switch module, the third switch module, the motor control module and the motor are controlled to form a normal drive circuit, so that the up-current charging device enters a normal drive mode.

[0037] In one embodiment, when no boost charging signal is received and the battery module is in a charging state, the method further includes:

[0038] By controlling the relays in the first switch module, the second switch module and the third switch module to be in an open state, and controlling the relays in the fourth switch module to be in a closed state, the fourth switch module, the charging module and the battery module are controlled to form a DC fast charging circuit, so that the boost charging device enters the DC fast charging mode.

[0039] In one embodiment, when the first switch module further includes a battery heating unit, the method further includes:

[0040] According to the received battery heating signal, the battery heating unit is controlled to enter a working state, and the relay in the second switch module and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in a closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in an open state, so as to control the battery heating unit, the charging module, the battery module, the second switch module, the fourth switch module, the motor control module and the motor to form a battery heating circuit, so that the up-current charging device enters a battery heating mode.

[0041] To achieve the above objectives, the present application also proposes a new energy vehicle, which includes a battery module and the above-mentioned boost charging device, the battery module is connected to the boost charging device, and the specific details of the boost charging device are as mentioned above and will not be repeated here.

[0042] To achieve the above objectives, the present application also provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of the above-mentioned boost charging control method.

[0043] The present application provides a boost charging device, which includes a first switch module, a second switch module, a third switch module, a fourth switch module, a motor control module and a motor; the first switch module is respectively connected to the charging module and the motor control module, one end of the second switch module is connected to the battery module, the other end of the second switch module is respectively connected to the third switch module and the neutral point of the three-phase winding of the motor, the third switch module is connected to the motor control module, the fourth switch module is connected between the charging module and the battery module, and the motor control module is respectively connected to the battery module and the motor; after receiving the boost charging signal, the first switch module, the second switch module, the third switch module and the fourth switch module control the first switch module, the second switch module, the fourth switch module, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by adjusting their respective switch states, thereby, under the condition of constant charging power, the step-down function of the step-down circuit can be used to increase the charging current output by the charging module to the battery module. Thereby reducing or even avoiding the limitation of the charging capacity of the charging module (i.e., the maximum charging current that the charging module can provide) on the charging rate of the battery module, so as to increase the battery charging rate and shorten the battery charging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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.

[0045] Figure 1 A schematic diagram of the module structure of the current boost charging device provided in the first embodiment of the present application;

[0046] Figure 2 A schematic diagram of the module structure of a boost charging device provided in the first embodiment of the present application when the first switch module includes a first relay, the second switch module includes a second relay, the third switch module includes a third relay and a fourth relay, and the fourth switch module includes a fifth relay and a sixth relay;

[0047] Figure 3 A schematic diagram of the module structure of a current boost charging device provided in the second embodiment of the present application;

[0048] Figure 4A schematic diagram of a charging circuit for inductive charging provided in the second embodiment of the present application;

[0049] Figure 5 A schematic diagram of a discharge circuit for inductor discharge provided in the second embodiment of the present application;

[0050] Figure 6 A schematic diagram of the module structure of a current boost charging device provided in the third embodiment of the present application;

[0051] Figure 7 A schematic diagram of a charging circuit for inductive charging provided in the third embodiment of the present application;

[0052] Figure 8 A schematic diagram of a discharge circuit for inductive discharge provided in the third embodiment of the present application;

[0053] Fig. 9 A schematic diagram of the module structure of a current boost charging device provided in the fourth embodiment of the present application;

[0054] Fig.10 A schematic diagram of the module structure of a current-boosting charging device when the battery heating unit provided in the fourth embodiment of the present application includes a fifth relay and a diode;

[0055] Fig.11 A schematic diagram of the circuit structure of the boost charging device provided in the fourth embodiment of the present application when in the battery heating mode;

[0056] Fig.12 A schematic diagram of a battery heating circuit when the battery and the inductor provided in the fourth embodiment of the present application are both in a charging state;

[0057] Fig.13 A schematic diagram of a battery heating circuit when the battery is in a charging state and the inductor is in a discharging state provided in the fourth embodiment of the present application;

[0058] Fig.14 A schematic diagram of a battery heating circuit when the battery provided in the fourth embodiment of the present application is in a discharging state and the inductor is in a charging state;

[0059] Fig.15 A schematic diagram of a battery heating circuit when the battery and the inductor provided in the fourth embodiment of the present application are both in a discharge state;

[0060] Fig.16 A schematic diagram of the module structure of a current boost charging device provided in the fifth embodiment of the present application;

[0061] Fig.17 A schematic diagram of the module structure of a current-boosting charging device when the pre-charging unit provided in the fifth embodiment of the present application includes a sixth relay and a pre-charging resistor;

[0062] Fig.18 A schematic diagram of the module structure of a current boost charging device provided in the sixth embodiment of the present application;

[0063] Fig.19 A schematic diagram of the module structure of a boost charging device provided in the sixth embodiment of the present application when the first voltage stabilizing module includes a first capacitor and the second voltage stabilizing module includes a second capacitor;

[0064] Fig. 20 A schematic diagram of the circuit structure of the boost charging device provided in the seventh embodiment of the present application when in a normal driving mode;

[0065] Fig.21 A schematic diagram of the circuit structure of the boost charging device provided in the eighth embodiment of the present application when in a DC fast charging mode;

[0066] Fig. 22 A schematic diagram of the circuit structure of an existing charging column for charging a battery provided in an embodiment of the present application;

[0067] Fig.23 A schematic diagram of a circuit structure for realizing charging of a battery by a charging column using a current-boosting charging device provided in an embodiment of the present application;

[0068] Fig.24 A schematic diagram of the circuit structure of the boost charging device provided in an embodiment of the present application when in a boost charging mode;

[0069] Fig.25 A schematic flow chart of a current boost charging control method provided in an embodiment of the present application;

[0070] Fig.26 A functional block diagram of a new energy vehicle provided in an embodiment of the present application.

[0071] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0072] Description of Figure Numbers:

[0073] 10. First switch module; 20. Second switch module; 30. Third switch module; 40. Fourth switch module; 50. Motor control module; 60. First voltage stabilizing module; 70. Second voltage stabilizing module; 11. Battery heating unit; 21. Pre-charging unit; 51. Motor controller; 52. Inverter; 100. Charging module; 200. Battery module; 300. Vehicle control module; S1~S8, relay; C1, bus capacitor; Y1~Y2, capacitor; R1, pre-charging resistor; D1, diode; Q1~Q6, switch tube; U1, charging pile; U2, battery. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments 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.

[0075] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0076] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0077] With the popularity of new energy electric vehicles, people's demand for fast energy replenishment of electric vehicles is becoming stronger and stronger. At present, the main types of electric vehicle charging are AC charging and DC charging. DC charging has become a mainstream charging method for new energy vehicles due to its advantages such as high charging power and fast energy replenishment. When charging the battery of a new energy vehicle by DC charging, the charging voltage of the battery is generally the voltage between the positive and negative electrodes of the battery, and the charging current of the battery is generally the charging current limited by the charging pile.

[0078] However, with the development of battery technology, the maximum charging current that most charging piles on the market can provide is much lower than the maximum charging current that the battery can withstand. In this case, if the voltage between the positive and negative electrodes of the battery is low, the charging power output by the charging pile to the battery during the actual charging process will be much lower than the maximum output power of the charging pile, which will limit the charging rate of the battery and cause the charging time to be unnecessarily extended.

[0079] Based on this, the present application proposes a current boost charging device. In the first embodiment of the present application, please refer to Figure 1The boost charging device may include a first switch module 10, a second switch module 20, a third switch module 30, a fourth switch module 40, a motor control module 50 and a motor M1; the first switch module 10 is respectively connected to the charging module 100 and the motor control module 50, one end of the second switch module 20 is connected to the battery module 200, and the other end of the second switch module 20 is respectively connected to the third switch module 30 and the neutral point of the three-phase winding of the motor M1, the third switch module 30 is connected to the motor control module 50, and the fourth switch module 40 is connected between the charging module 100 and the battery module 200. Between the modules 200, the motor control module 50 is respectively connected to the battery module 200 and the motor M1; after receiving the boost charging signal, the first switch module 10, the second switch module 20, the third switch module 30 and the fourth switch module 40 control the first switch module 10, the second switch module 20, the fourth switch module 40, the charging module 100, the battery module 200, the motor control module 50 and the motor M1 to form a step-down circuit by adjusting their respective switch states, so as to increase the charging current output by the charging module 100 to the battery module 200 based on the step-down circuit.

[0080] It should be noted that the boost charging signal is used to indicate that the charging current output by the charging module 100 to the battery module 200 needs to be increased. The switch state may include a closed state and an open state. The buck circuit (Buck circuit) is a DC-DC converter based on the principle of inductor energy storage. Its working principle is to use a PWM (Pulse Width Modulation) signal to control the opening and closing of the power switch in the circuit. When the PWM signal is at a high level, the power switch is closed, allowing the input voltage to charge the inductor and provide current to the load. At this time, the circuit is in charging mode; when the PWM signal is at a low level, the power switch is disconnected, cutting off the direct connection between the input voltage and the output, but the load current continues to be provided by the inductor to achieve smooth discharge. Therefore, by adjusting the duty cycle of the PWM signal, the Buck circuit can effectively adjust the output voltage to a certain level lower than the input voltage. After the Buck circuit realizes the step-down function, if the power in the circuit is constant, the current output in the circuit will be increased. On this basis, under the condition that the charging power is constant, this embodiment can increase the charging current output by the charging module 100 to the battery module 200 by utilizing the step-down circuit formed by the first switch module 10, the second switch module 20, the fourth switch module 40, the charging module 100, the battery module 200, the motor control module 50 and the motor M1.

[0081] In one possible implementation, please refer to Figure 2The first switch module 10 may include a first relay S1, the second switch module 20 may include a second relay S2 and a fourth relay S4, the third switch module 30 may include a third relay S3, and the fourth switch module 40 may include a fifth relay S5 and a sixth relay S6; the first relay S1 is respectively connected to the charging module 100 and the motor control module 50, the second relay S2 is respectively connected to the battery module 200 and the third relay S3, the third relay S3 is connected to the motor control module 50, one end of the fourth relay S4 is connected to the neutral point of the three-phase winding of the motor M1, and the other end of the fourth relay S4 is connected between the second relay S2 and the third relay S3, one end of the fifth relay S5 is respectively connected to the charging module 100 and the first relay S1, and the other end of the fifth relay S5 is respectively connected to the battery module 200 and the second relay S2, one end of the sixth relay S6 is connected to the charging module 100, and the other end of the sixth relay S6 is respectively connected to the battery module 200 and the motor control module 50.

[0082] On this basis, according to the switch control instructions issued by the battery management system (BMS), the first relay S1, the second relay S2, the fourth relay S4 and the sixth relay S6 can be controlled to be in a closed state, and the third relay S3 and the fifth relay S5 can be controlled to be in an open state, so as to control the first relay S1, the second relay S2, the fourth relay S4, the sixth relay S6, the charging module 100, the battery module 200, the motor control module 50 and the motor M1 to form a step-down circuit.

[0083] It should be noted that the relay involved in this embodiment refers to a controllable switch with opening and closing functions. In other embodiments, thyristors, transistors, field effect transistors, etc. can also be used to replace the relay in this embodiment.

[0084] It is understandable that, according to the switch control instruction issued by the battery management system, the first relay S1, the second relay S2, the fourth relay S4 and the sixth relay S6 are all controlled to be in a closed state, and the third relay S3 and the fifth relay S5 are controlled to be in a disconnected state, and the charging module 100 will not be directly connected to the battery module 200, and the two will form a step-down circuit with the first relay S1, the second relay S2, the fourth relay S4, the sixth relay S6, the motor control module 50 and the motor M1. Therefore, the output of the charging module 100 needs to be processed by the step-down circuit before entering the battery module 200. The step-down circuit has a step-down function, so that the charging module 100 can reduce the voltage under the action of the step-down circuit to increase the charging current output by the charging module 100 to the battery module 200 under the condition of constant charging power.

[0085] The present embodiment provides a boost charging device, which includes a first switch module 10, a second switch module 20, a third switch module 30, a fourth switch module 40, a motor control module 50 and a motor M1; the first switch module 10 is respectively connected to the charging module 100 and the motor control module 50, one end of the second switch module 20 is connected to the battery module 200, and the other end of the second switch module 20 is respectively connected to the third switch module 30 and the neutral point of the three-phase winding of the motor M1, the third switch module 30 is connected to the motor control module 50, the fourth switch module 40 is connected between the charging module 100 and the battery module 200, and the motor control module 50 is respectively connected to the battery module 200 and the motor M1; after receiving the boost charging signal, the first switch module 10, the second switch module 20, the third switch module 30 and the fourth switch module 40 control the first switch module 10, the second switch module 20, the fourth switch module 40, the charging module 100, the battery module 200, the motor control module 50 and the motor M1 to form a step-down circuit by adjusting their respective switch states. Therefore, under the condition of constant charging power, the step-down function of the step-down circuit can be used to increase the charging current output by the charging module 100 to the battery module 200. This reduces or even avoids the limitation of the charging capacity of the charging module 100 (i.e., the maximum charging current that the charging module 100 can provide) on the charging rate of the battery module 200, thereby increasing the battery charging rate and shortening the battery charging time.

[0086] In addition, since this embodiment directly forms a step-down circuit by reusing the devices of the whole vehicle to realize the function of the step-down converter, there is no need to design an additional step-down circuit or add an additional DC-DC converter, which saves the cost and volume of the whole vehicle to a certain extent.

[0087] Based on the above first embodiment, a second embodiment of the boost charging device of the present application is proposed. In the second embodiment of the boost charging device of the present application, please refer to Figure 3 The motor control module 50 may include a DC bus, a motor controller 51 and an inverter 52; the motor controller 51 is connected to the inverter 52, and the inverter 52 is respectively connected to the battery module 200 and the motor M1, and the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive pole of the DC bus.

[0088] It should be noted that after the buck circuit is formed, the motor controller 51 can realize the buck function of the buck circuit by controlling the inductance of the motor M1 to be in the charging state and the discharging state in turn, so as to increase the charging current output by the charging module 100 to the battery module 200 under the condition of constant charging power.

[0089] In the high level period of the PWM signal, the inductance of the motor M1 can be controlled to be in a charging state by dynamically controlling the opening and closing of each switch tube of the inverter 52; in the low level period of the PWM signal, the inductance of the motor M1 can be controlled to be in a discharging state by dynamically controlling the opening and closing of each switch tube of the inverter 52. The duty cycle of the PWM signal can be determined according to the actual situation of the battery (such as the battery SOC), or it can be a default setting value, which is not specifically limited in this embodiment.

[0090] In a feasible implementation, during the high level period of the PWM signal, the specific process of controlling the inductance of the motor M1 to be in a charging state by dynamically controlling the opening and closing of each switch tube of the inverter 52 may include: during the high level period of the PWM signal, controlling at least one switch tube in the upper half bridge of the inverter 52 to be closed and all switch tubes in the lower half bridge to be opened, so as to control the inductance of the motor M1 to be in a charging state based on the buck circuit.

[0091] For example, the switch tube in the inverter 52 is a MOS tube, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, and the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6. Figure 4 . During the high level period of the PWM signal, the MOS tubes of the upper half bridge of the control inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all closed, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all disconnected. On this basis, a charging circuit of "charging module 100->first MOS tube Q1, second MOS tube Q2 and third MOS tube Q3->motor M1->battery module 200->charging module 100" will be formed, so that the inductance of the motor M1 is in a charging state. Among them, the MOS tube mentioned in this example can be MOSFET, IGBT or SiC MOSFET, etc., and this embodiment does not specifically limit this.

[0092] In a feasible implementation, during the low level period of the PWM signal, the specific process of controlling the inductance of the motor M1 to be in a discharge state by dynamically controlling the opening and closing of each switch tube of the inverter 52 may include: during the low level period of the PWM signal, controlling all switch tubes of the upper half bridge of the inverter 52 to be opened and at least one switch tube in the lower half bridge to be closed, so as to control the inductance of the motor M1 to be in a discharge state based on the buck circuit.

[0093] For example, the switch tube in the inverter 52 is a MOS tube, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, and the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6. Figure 5 . During the low level period of the PWM signal, the MOS tubes of the upper half bridge of the control inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all disconnected, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all closed. On this basis, a discharge loop of "battery module 200->motor M1->fourth MOS tube Q4, fifth MOS tube Q5 and sixth MOS tube Q6->battery module 200" will be formed, so that the inductance of the motor M1 is in a discharge state. Among them, the MOS tube mentioned in this example can be MOSFET, IGBT or SiC MOSFET, etc., and this embodiment does not specifically limit this.

[0094] Based on the above first embodiment, a second embodiment of the boost charging device of the present application is proposed. In the second embodiment of the boost charging device of the present application, please refer to Figure 6 The motor control module 50 may include a DC bus, a motor controller 51 and an inverter 52; the motor controller 51 is connected to the inverter 52, and the inverter 52 is respectively connected to the battery module 200 and the motor M1, and the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the negative pole of the DC bus.

[0095] It should be noted that after the buck circuit is formed, the motor controller 51 can realize the buck function of the buck circuit by controlling the inductance of the motor M1 to be in the charging state and the discharging state in turn, so as to increase the charging current output by the charging module 100 to the battery module 200 under the condition of constant charging power.

[0096] In the high level period of the PWM signal, the inductance of the motor M1 can be controlled to be in a charging state by dynamically controlling the opening and closing of each switch tube of the inverter 52; in the low level period of the PWM signal, the inductance of the motor M1 can be controlled to be in a discharging state by dynamically controlling the opening and closing of each switch tube of the inverter 52. The duty cycle of the PWM signal can be determined according to the actual situation of the battery (such as the battery SOC), or it can be a default setting value, which is not specifically limited in this embodiment.

[0097] In a feasible implementation, during the high level period of the PWM signal, the specific process of controlling the inductance of the motor M1 to be in a charging state by dynamically controlling the opening and closing of each switch tube of the inverter 52 may include: during the high level period of the PWM signal, controlling all switch tubes of the upper half bridge of the inverter 52 to be opened and at least one switch tube in the lower half bridge to be closed, so as to control the inductance of the motor M1 to be in a charging state based on the buck circuit.

[0098] For example, the switch tube in the inverter 52 is a MOS tube, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, and the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6. Figure 7 . During the high level period of the PWM signal, the MOS tubes of the upper half bridge of the control inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all disconnected, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all closed. On this basis, a charging loop of "charging module 100->battery module 200->motor M1->fourth MOS tube Q4, fifth MOS tube Q5 and sixth MOS tube Q6->charging module 100" will be formed, so that the inductance of the motor M1 is in a charging state. Among them, the MOS tube mentioned in this example can be MOSFET, IGBT or SiC MOSFET, etc., and this embodiment does not specifically limit this.

[0099] In a feasible implementation, during the low level period of the PWM signal, the specific process of controlling the inductance of the motor M1 to be in a discharge state by dynamically controlling the opening and closing of each switch tube of the inverter 52 may include: during the low level period of the PWM signal, controlling at least one target switch tube in the upper half bridge of the inverter 52 to be closed and all the switch tubes in the lower half bridge to be opened, so as to control the inductance of the motor M1 to be in a discharge state based on the buck circuit.

[0100] In an example, the switch tube in the inverter 52 is a MOS tube, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, and the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6. Figure 8. During the low level period of the PWM signal, the MOS tubes of the upper half bridge of the control inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all closed, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all disconnected. On this basis, a discharge loop of "battery module 200->motor M1->first MOS tube Q1, second MOS tube Q2 and third MOS tube Q3->battery module 200" will be formed, so that the inductance of the motor M1 is in a discharge state. Among them, the MOS tube mentioned in this example can be MOSFET, IGBT or SiC MOSFET, etc., and this embodiment does not specifically limit this.

[0101] Based on the above-mentioned first embodiment, second embodiment and / or third embodiment, a fourth embodiment of the current boost charging device of the present application is proposed. In the fourth embodiment of the current boost charging device of the present application, please refer to Fig. 9 The first switch module 10 may also include a battery heating unit 11 connected in parallel with the first relay S1; after receiving the battery heating signal, the battery heating unit 11 is used to form a battery heating circuit with the charging module 100, the battery module 200, the second relay S2, the fourth relay S4, the sixth relay S6, the motor control module 50 and the motor M1.

[0102] It should be noted that the battery heating signal is used to indicate that the batteries in the battery module 200 need to be heated.

[0103] In addition, it should be noted that after receiving the battery heating signal, the battery heating unit 11 can be controlled to enter the working state, and the relay in the second switch module 20 and the relay in the fourth switch module 40 that is not connected to the second switch module 20 are controlled to be in a closed state, and the relay in the third switch module 30 and the relay in the fourth switch module 40 that is connected to the second switch module 20 are controlled to be in an open state, so as to control the battery heating unit 11, the charging module 100, the battery module 200, the second relay S2, the fourth relay S4, the sixth relay S6, the motor control module 50 and the motor M1 to form a battery heating circuit, so that the up-current charging device enters the battery heating mode.

[0104] In one possible implementation, please refer to Fig.10 The battery heating unit 11 may include a seventh relay S7 and a diode D1; one end of the seventh relay S7 is respectively connected to one end of the first relay S1 and the charging module 100, the other end of the seventh relay S7 is connected to the anode of the diode D1, and the cathode of the diode D1 is respectively connected to the other end of the first relay S1 and the motor control module 50.

[0105] For example, the first switch module 10 includes a first relay S1, a seventh relay S7 and a diode D1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6, the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive electrode of the motor control module 50, the switch tube is a MOS tube, the charging module 100 includes a charging pile U1, the battery module 200 includes a battery U2, and the motor control module 50 includes a bus capacitor C1, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6. Then, after the motor control module 50 controls the battery heating unit 11 to enter the working state, controls the second relay S2, the fourth relay S4 and the sixth relay S6 to be in the closed state, and controls the third relay S3 and the fifth relay S5 to be in the open state, the boost charging device will be in the following state. Fig.11 The status shown (i.e. battery heating mode).

[0106] It is understandable that after the boost charging device enters the battery heating mode, under different states of the battery in the battery module 200, the motor control module 50 can generate four battery heating circuits respectively by controlling the opening and closing of each switch tube of the inverter 52. Specifically, take the switch tube in the inverter 52 as a MOS tube, the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive pole of the motor control module 50, the first switch module 10 includes a first relay S1, a seventh relay S7 and a diode D1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, and the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6 as an example.

[0107] When the battery is in a charging state, the MOS tubes of the upper half bridge of the inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all closed, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all opened to form the following: Fig.12The battery heating circuit shown is composed of "charging module 100->first MOS tube Q1, second MOS tube Q2 and third MOS tube Q3->motor M1->battery module 200->charging module 100" and "first MOS tube Q1, second MOS tube Q2 and third MOS tube Q3->bus capacitor C1->battery module 200". At this time, the battery in the battery module 200 and the inductance of the motor M1 are in a charging state. In addition, the MOS tubes of the upper half bridge of the inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all disconnected, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all closed, so as to form the following. Fig.13 The battery heating circuit shown is composed of "battery module 200->fourth MOS tube Q4, fifth MOS tube Q5 and sixth MOS tube Q6->motor M1->battery module 200" and "charging module 100->seventh relay S7 and diode D1->bus capacitor C1->charging module 100". At this time, the batteries in the battery module 200 are in a charging state, and the inductance of the motor M1 is in a discharging state.

[0108] When the battery is in a discharging state, the MOS tubes of the upper half bridge of the inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) can be disconnected, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) can be closed to form the following: Fig.14 The battery heating circuit shown in the figure is composed of "battery module 200->motor M1->fourth MOS tube Q4, fifth MOS tube Q5 and sixth MOS tube Q6->battery module 200" and "charging module 100->seventh relay S7 and diode D1->bus capacitor C1->charging module 100". At this time, the battery in the battery module 200 is in a discharging state, and the inductance of the motor M1 is in a charging state. In addition, the MOS tubes of the upper half bridge of the inverter 52 (corresponding to the first MOS tube Q1, the second MOS tube Q2 and the third MOS tube Q3 in the figure) are all closed, and the switch tubes of the lower half bridge (corresponding to the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6 in the figure) are all disconnected, so as to form the following. Fig.15 In the battery heating circuit of “battery module 200->motor M1->first MOS tube Q1, second MOS tube Q2 and third MOS tube Q3->bus capacitor C1->battery module 200” shown in the figure, the batteries in the battery module 200 and the inductance of the motor M1 are in a discharging state.

[0109] Based on the above-mentioned first embodiment, second embodiment, third embodiment and / or fourth embodiment, a fifth embodiment of the boost charging device of the present application is proposed. In the fifth embodiment of the boost charging device of the present application, please refer to Fig.16 The second switch module 20 may further include a pre-charging unit 21 connected in parallel with the second relay S2; after receiving the battery charging signal, the pre-charging unit 21 is used to form a pre-charging circuit with the second relay S2, the fifth relay S5, the sixth relay S6, the charging module 100 and the battery module 200.

[0110] It should be noted that after receiving the battery charging signal, by controlling the pre-charging unit 21 to enter the working state and controlling the second relay S2, the fifth relay S5 and the sixth relay S6 to be in the closed state, the pre-charging unit 21, the second relay S2, the fifth relay S5, the sixth relay S6, the charging module 100 and the battery module 200 can be controlled to form a pre-charging circuit.

[0111] In one possible implementation, please refer to Fig.17 The pre-charging unit 21 may include an eighth relay S8 and a pre-charging resistor R1; one end of the eighth relay S8 is respectively connected to one end of the second relay S2 and the battery module 200, the other end of the eighth relay S8 is connected to one end of the pre-charging resistor R1, and the other end of the pre-charging resistor R1 is connected to the other end of the second relay S2. By controlling the eighth relay S8 to be in a closed state, the pre-charging unit 21 can be controlled to enter a working state.

[0112] In this embodiment, by providing the pre-charging unit 21, overcharging during the battery charging process can be avoided.

[0113] Based on the above-mentioned first embodiment, second embodiment, third embodiment, fourth embodiment and / or fifth embodiment, a sixth embodiment of the boost charging device of the present application is proposed. In the sixth embodiment of the boost charging device of the present application, please refer to Fig.18 The boost charging device may further include a first voltage stabilizing module 60 and a second voltage stabilizing module 70; one end of the first voltage stabilizing module 60 is connected between the second switch module 20 and the third switch module 30, and the other end of the first voltage stabilizing module 60 is respectively connected to the battery module 200 and the motor control module 50; one end of the second voltage stabilizing module 70 is connected to the positive electrode of the motor control module 50, and the other end of the second voltage stabilizing module 70 is connected to the negative electrode of the motor control module 50; the first voltage stabilizing module 60 and the second voltage stabilizing module 70 are used to stabilize the charging voltage output by the charging module 100 to the battery module 200.

[0114] In one possible implementation, please refer to Fig.19The first voltage stabilizing module 60 may include a first capacitor Y1 , and the second voltage stabilizing module 70 may include a second capacitor Y2 . The first capacitor Y1 may reuse the bus capacitor C1 in the motor control module 50 .

[0115] Based on the above-mentioned first embodiment, second embodiment, third embodiment, fourth embodiment, fifth embodiment and / or sixth embodiment, a seventh embodiment of the up-current charging device of the present application is proposed. In the seventh embodiment of the up-current charging device of the present application, when the vehicle to which the up-current charging device belongs is in a driving state, the relays in the first switch module 10, the fourth switch module 40, and the relay in the second switch module connected to the neutral point of the three-phase winding of the motor M1 are controlled to be in a disconnected state according to the switch control instructions issued by the battery management system, and the relays in the second switch module 20 that are not connected to the neutral point of the three-phase winding of the motor M1 and the relays in the third switch module 30 are controlled to be in a closed state, so as to control the battery module 100, the second switch module 20, the third switch module 30, the motor control module 50 and the motor M1 to form a normal drive circuit, so that the up-current charging device enters a normal drive mode.

[0116] It should be noted that after the boost charging device enters the normal driving mode, the motor control module 50 and the motor M1 will operate in the electric mode or the power generation mode.

[0117] For example, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6, the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive electrode of the motor control module 50, the switch tube is a MOS tube, the charging module 100 includes a charging pile U1, the battery module 200 includes a battery U2, and the motor control module 50 includes a bus capacitor C1, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6. After completing the above operations, the boost charging device will be in the following state: Fig. 20 The state shown (ie normal driving mode).

[0118] It can be understood that when the vehicle to which the boost charging device belongs is in a driving state, by controlling the boost charging device to enter a normal driving mode, the motor control module 50 and the motor M1 will be controlled to operate in an electric mode or a power generation mode, thereby being used as a power source or an energy recovery device to drive or assist the tire rotation.

[0119] Based on the above-mentioned first embodiment, second embodiment, third embodiment, fourth embodiment, fifth embodiment, sixth embodiment and / or seventh embodiment, an eighth embodiment of the up-current charging device of the present application is proposed. In the eighth embodiment of the up-current charging device of the present application, when the up-current charging signal is not received, the relays in the first switch module 10, the second switch module 20 and the third switch module 30 can also be controlled to be in the disconnected state according to the switch control instructions issued by the battery management system, and the relays in the fourth switch module 40 can be controlled to be in the closed state, so as to control the fourth switch module 40, the charging module 100 and the battery module 200 to form a DC fast charging circuit, so that the up-current charging device enters the DC fast charging mode.

[0120] For example, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6, the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive electrode of the motor control module 50, the switch tube is a MOS tube, the charging module 100 includes a charging pile U1, the battery module 200 includes a battery U2, and the motor control module 50 includes a bus capacitor C1, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6. After completing the above operations, the boost charging device will be in the following state: Fig.21 The state shown (i.e. DC fast charging mode).

[0121] It is understandable that, since there is no need to increase the charging current output by the charging module 100 to the battery module 200 when the boost charging signal is not received, the charging module 100 can be directly connected to the battery module 200 by controlling the relays in the first switch module 10, the second switch module 20 and the third switch module 30 to be in an open state, and controlling the relays in the fourth switch module 40 to be in a closed state. After the charging module 100 is directly connected to the battery module 200, the boost charging device will enter the DC fast charging mode, so that the charging current output by the charging module 100 will be directly input to the battery module.

[0122] It should be noted that the specific composition of the first switch module 10, the second switch module 20, the third switch module 30 and the fourth switch module 40 involved in the above-mentioned embodiments and their connection with the motor control module 50, the specific composition of the charging module 100, the specific composition of the battery module 200, the specific composition of the motor control module 50 and the type of switch tube can all be flexibly set according to actual conditions.

[0123] On this basis, in order to help understand the use of the current boost charging device of the present application to realize the charging of the battery module 200 by the charging module 100, and the realization principle of the charging of the battery module 200 by the charging module 100 in the prior art. For example, the first switch module 10 includes a first relay S1, the second switch module 20 includes a second relay S2 and a fourth relay S4, the third switch module 30 includes a third relay S3, the fourth switch module 40 includes a fifth relay S5 and a sixth relay S6, the first switch module 10, the second switch module 20 and the third switch module 30 are all connected to the positive pole of the motor control module 50, the switch tube is a MOS tube, the charging module 100 includes a charging pile U1, the battery module 200 includes a battery U2, and the motor control module 50 includes a bus capacitor C1, a first MOS tube Q1, a second MOS tube Q2, a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6 as an example. It can be obtained as follows Fig. 22 The circuit structure diagram of the prior art for realizing the charging module 100 charging the battery module 200 is shown, and Fig.23 The circuit structure diagram shown is a circuit diagram of using the current boost charging device of the present application to realize the charging module 100 charging the battery module 200.

[0124] according to Fig. 22 It can be seen that in the prior art, when the second relay S2, the fifth relay S5 and the sixth relay S6 are all closed, the charging pile U1 will be directly connected to the battery U2, and the charging current output by the charging pile U1 will be directly input to the battery U2.

[0125] according to Fig.23 It can be seen that in the present application, when the first relay S1, the second relay S2, the fourth relay S4 and the sixth relay S6 are all in the closed state, and the third relay S3 and the fifth relay S5 are all in the open state, the boost charging device will be in the following state: Fig.24 The state shown (i.e., the boost charging mode). At this time, the charging pile U1 is not directly connected to the battery U2, and the two will form a step-down circuit with the first relay S1, the second relay S2, the fourth relay S4, the sixth relay S6, the motor control module 50 and the motor M1. As a result, the output of the charging pile U1 needs to be processed by the step-down circuit before entering the battery U2. The step-down circuit has a step-down function, so that the charging pile U1 can reduce the voltage under the action of the step-down circuit to increase the charging current output by the charging pile U1 to the battery U2 under the condition of constant charging power. In contrast, when the first relay S1, the second relay S2, the third relay S3 and the fourth relay S4 are all in the open state, and the fifth relay S5 and the sixth relay S6 are all in the closed state, the charging pile U1 will be directly connected to the battery U2, so that the charging current output by the charging pile U1 will be directly input to the battery U2.

[0126] It should be noted that the above examples are only used to assist in understanding the present application, and do not constitute a limitation on the specific composition of the boost charging device, the specific composition of the first switch module 10, the second switch module 20, the third switch module 30 and the fourth switch module 40, and the connection with the motor control module 50, the specific composition of the charging module 100, the specific composition of the battery module 200, the specific composition of the motor control module 50 and the type of the switch tube. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0127] The present application also provides a boost charging control method, which is applied to the above-mentioned boost charging device, please refer to Fig.25 The boost charging control method includes steps S10 to S20:

[0128] Step S10, according to the received boost charging signal, regulating the switch states of the first switch module, the second switch module, the third switch module and the fourth switch module of the boost charging device to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor of the boost charging device to form a step-down circuit with the charging module and the battery module;

[0129] Step S20, based on the step-down circuit, controlling the inductance of the motor to be in a charging state and a discharging state in sequence, so as to increase the charging current output by the charging module to the battery module.

[0130] In a feasible implementation, step S10 may include:

[0131] According to the received boost charging signal, the first switch module, the relay in the second switch module, and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in a closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in an open state, so as to control the first switch module, the second switch module, the fourth switch module, the motor control module, the motor, the charging module and the battery module to form a step-down circuit.

[0132] In a feasible implementation, step S20 may include:

[0133] After the buck circuit is formed, the opening and closing of each switch tube of the inverter in the motor control module are dynamically controlled based on the PWM signal, so as to control the inductance of the motor to be in the charging state and the discharging state in turn based on the buck circuit.

[0134] In a feasible implementation manner, when the first switch module, the second switch module and the third switch module are all connected to the positive electrode of the motor control module, step S20 may include:

[0135] After the buck circuit is formed, during the high level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a charging state based on the buck circuit;

[0136] During the low level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is closed, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

[0137] In a feasible implementation manner, when the first switch module, the second switch module and the third switch module are all connected to the negative pole of the motor control module, step S20 may include:

[0138] After the buck circuit is formed, during the high level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is closed, so as to control the inductance of the motor to be in a charging state based on the buck circuit;

[0139] During the low level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

[0140] In a feasible implementation manner, when the vehicle to which the boost charging device belongs is in a driving state, the boost charging control method may further include:

[0141] By controlling the first switch module, the relays in the fourth switch module, and the relay in the second switch module connected to the neutral point of the three-phase winding of the motor to be in the disconnected state, and controlling the relay in the second switch module that is not connected to the neutral point of the three-phase winding of the motor and the relay in the third switch module to be in the closed state, the battery module, the second switch module, the third switch module, the motor control module and the motor are controlled to form a normal drive circuit, so that the up-current charging device enters the normal drive mode.

[0142] In a feasible implementation manner, when the boost charging signal is not received, the boost charging control method may further include:

[0143] By controlling the relays in the first switch module, the second switch module and the third switch module to be in the disconnected state, and controlling the relays in the fourth switch module to be in the closed state, the fourth switch module, the charging module and the battery module are controlled to form a DC fast charging circuit, so that the up-current charging device enters the DC fast charging mode.

[0144] In a feasible implementation manner, when the first switch module further includes a battery heating unit, the boost charging control method may further include:

[0145] According to the received battery heating signal, the battery heating unit is controlled to enter the working state, and the relay in the second switch module and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in the closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in the open state, so as to control the battery heating unit, the charging module, the battery module, the second switch module, the fourth switch module, the motor control module and the motor to form a battery heating circuit, so that the up-current charging device enters the battery heating mode.

[0146] The boost charging control method provided by the present application is applied to the boost charging device in the above embodiment, and can solve the problem of low battery charging rate caused by the limitation of the charging capacity of the charging pile. Compared with the prior art, the beneficial effects of the boost charging control method provided by the present application are the same as the beneficial effects of the boost charging device provided by the above embodiment, and the other technical features in the boost charging control method are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0147] In addition, the present application also provides a boost charging control device, which includes: at least one processor; and a memory that is communicatively connected to the at least one processor, or a memory integrated in the processor; wherein the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor so that the at least one processor can perform the steps of the above-mentioned boost charging control method.

[0148] The boost charging control device provided by the present application can solve the problem of low battery charging rate caused by the limited charging capacity of the charging pile. Compared with the prior art, the beneficial effects of the boost charging control device provided by the present application are the same as the beneficial effects of the boost charging control method provided by the above embodiment, which will not be repeated here.

[0149] In addition, the present application also provides a new energy vehicle, which includes a battery module 200 and a boost charging device; the battery module 200 is connected to the boost charging device. It can be understood that since the above-mentioned boost charging device is used in the new energy vehicle, the embodiment of the new energy vehicle includes all technical solutions of all embodiments of the above-mentioned boost charging device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0150] In one possible implementation, please refer to Fig.26The new energy vehicle may further include a vehicle control module 300, which is connected to the battery module 200 and the boost charging device respectively, and is used to connect to the charging module 100; the vehicle control module 300 is used to output a boost charging signal to the boost charging device when it is monitored that the charging current required by the battery module 200 is greater than the maximum output current of the charging module 100; and is also used to output a battery heating signal to the boost charging device when it is monitored that the temperature of the battery in the battery module 200 is less than a preset temperature threshold.

[0151] It should be noted that the vehicle control module 300 may be a VCU (Vehicle Control Unit). The vehicle control module 300 may output a boost charging signal to the boost charging device via a CAN bus.

[0152] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A current boost charging device, characterized in that: The boost charging device comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a motor control module and a motor; The first switch module is respectively connected to the charging module and the motor control module, one end of the second switch module is connected to the battery module, the other end of the second switch module is respectively connected to the third switch module and the neutral point of the three-phase winding of the motor, the third switch module is connected to the motor control module, the fourth switch module is connected between the charging module and the battery module, and the motor control module is respectively connected to the battery module and the motor; After receiving the boost charging signal, the first switch module, the second switch module, the third switch module and the fourth switch module control the first switch module, the second switch module, the fourth switch module, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by adjusting their respective switch states, so as to increase the charging current output by the charging module to the battery module based on the step-down circuit.

2. The boost charging device according to claim 1, characterized in that: The first switch module includes a first relay, the second switch module includes a second relay and a fourth relay, the third switch module includes a third relay, and the fourth switch module includes a fifth relay and a sixth relay; The first relay is respectively connected to the charging module and the motor control module, the second relay is respectively connected to the battery module and the third relay, the third relay is connected to the motor control module, one end of the fourth relay is connected to the neutral point of the three-phase winding of the motor, and the other end of the fourth relay is connected between the second relay and the third relay, one end of the fifth relay is respectively connected to the charging module and the first relay, and the other end of the fifth relay is respectively connected to the battery module and the second relay, one end of the sixth relay is connected to the charging module, and the other end of the sixth relay is respectively connected to the battery module and the motor control module; After receiving the boost charging signal, the first relay, the second relay, the third relay, the fourth relay, the fifth relay and the sixth relay control the first relay, the second relay, the fourth relay, the sixth relay, the charging module, the battery module, the motor control module and the motor to form a step-down circuit by adjusting their respective switch states.

3. The boost charging device according to claim 2, characterized in that: The first switch module further includes a battery heating unit connected in parallel with the first relay; After receiving the battery heating signal, the battery heating unit is used to form a battery heating circuit with the charging module, the battery module, the second relay, the fourth relay, the sixth relay, the motor control module and the motor.

4. The boost charging device according to claim 3, characterized in that: The battery heating unit includes a seventh relay and a diode; One end of the seventh relay is respectively connected to one end of the first relay and the charging module, the other end of the seventh relay is connected to the anode of the diode, and the cathode of the diode is respectively connected to the other end of the first relay and the motor control module.

5. The boost charging device according to claim 2, characterized in that: The second switch module further includes a pre-charging unit connected in parallel with the second relay; After receiving the battery charging signal, the pre-charging unit is used to form a pre-charging loop with the second relay, the fifth relay, the sixth relay, the charging module and the battery module.

6. The boost charging device according to claim 5, characterized in that: The pre-charging unit includes an eighth relay and a pre-charging resistor; One end of the eighth relay is connected to one end of the second relay and the battery module respectively, the other end of the eighth relay is connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is connected to the other end of the second relay.

7. The boost charging device according to any one of claims 1 to 6, characterized in that: The boost charging device also includes a first voltage stabilizing module and a second voltage stabilizing module; One end of the first voltage stabilizing module is connected between the second switch module and the third switch module, and the other end of the first voltage stabilizing module is connected to the battery module and the motor control module respectively; one end of the second voltage stabilizing module is connected to the positive electrode of the motor control module, and the other end of the second voltage stabilizing module is connected to the negative electrode of the motor control module; The first voltage stabilizing module and the second voltage stabilizing module are used to stabilize the charging voltage output by the charging module to the battery module.

8. A method for controlling current boost charging, characterized in that: Applied to the boost charging device according to any one of claims 1 to 7, the method comprising: According to the received boost charging signal, the switch states of the first switch module, the second switch module, the third switch module and the fourth switch module of the boost charging device are adjusted to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor of the boost charging device to form a step-down circuit with the charging module and the battery module; Based on the step-down circuit, the inductance of the motor is controlled to be in a charging state and a discharging state in sequence, so as to increase the charging current output by the charging module to the battery module.

9. The method according to claim 8, characterized in that The step of regulating the switch states of the first switch module, the second switch module, the third switch module and the fourth switch module of the boost charging device according to the received boost charging signal to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor of the boost charging device to form a step-down circuit with the charging module and the battery module includes: According to the received boost charging signal, the first switch module, the relay in the second switch module, and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in a closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in an open state, so as to control the first switch module, the second switch module, the fourth switch module, the motor control module and the motor to form a step-down circuit with the charging module and the battery module.

10. The method according to claim 8, characterized in that The step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit comprises: After the buck circuit is formed, the opening and closing of each switch tube of the inverter in the motor control module are dynamically controlled based on the PWM signal, so as to control the inductance of the motor to be in a charging state and a discharging state in turn based on the buck circuit.

11. The method according to claim 10, characterized in that In the case where the first switch module, the second switch module and the third switch module are all connected to the positive electrode of the motor control module, the step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit includes: After the buck circuit is formed, during the high level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a charging state based on the buck circuit; During the low level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is controlled to be closed, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

12. The method according to claim 10, characterized in that In the case where the first switch module, the second switch module and the third switch module are all connected to the negative electrode of the motor control module, the step of controlling the inductance of the motor to be in a charging state and a discharging state in sequence based on the step-down circuit includes: After the buck circuit is formed, during the high level period of the PWM signal, all switch tubes of the upper half bridge of the inverter are controlled to be disconnected and at least one switch tube in the lower half bridge is controlled to be closed, so as to control the inductance of the motor to be in a charging state based on the buck circuit; During the low level period of the PWM signal, at least one switch tube in the upper half bridge of the inverter is controlled to be closed and all the switch tubes in the lower half bridge are disconnected, so as to control the inductance of the motor to be in a discharge state based on the buck circuit.

13. The method according to any one of claims 8 to 12, characterized in that When the vehicle to which the boost charging device belongs is in a driving state, the method further includes: By controlling the first switch module, the relay in the fourth switch module, and the relay in the second switch module connected to the neutral point of the three-phase winding of the motor to be in an open state, and controlling the relay in the second switch module that is not connected to the neutral point of the three-phase winding of the motor and the relay in the third switch module to be in a closed state, the battery module, the second switch module, the third switch module, the motor control module and the motor are controlled to form a normal drive circuit, so that the up-current charging device enters a normal drive mode.

14. The method according to any one of claims 8 to 12, characterized in that In the case where the boost charging signal is not received and the battery module is in a charging state, the method further includes: By controlling the relays in the first switch module, the second switch module and the third switch module to be in an open state, and controlling the relays in the fourth switch module to be in a closed state, the fourth switch module, the charging module and the battery module are controlled to form a DC fast charging circuit, so that the boost charging device enters the DC fast charging mode.

15. The method according to any one of claims 8 to 12, characterized in that In the case where the first switch module further includes a battery heating unit, the method further includes: According to the received battery heating signal, the battery heating unit is controlled to enter a working state, and the relay in the second switch module and the relay in the fourth switch module that is not connected to the second switch module are controlled to be in a closed state, and the relay in the third switch module and the relay in the fourth switch module that is connected to the second switch module are controlled to be in an open state, so as to control the battery heating unit, the charging module, the battery module, the second switch module, the fourth switch module, the motor control module and the motor to form a battery heating circuit, so that the up-current charging device enters a battery heating mode.

16. A new energy vehicle, characterized in that: The new energy vehicle comprises a battery module and a boost charging device according to any one of claims 1 to 7; the battery module is connected to the boost charging device.

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