Charging and discharging system, power assembly and vehicle

Abstract

The utility model discloses a charging and discharging system, a power assembly and a vehicle, and the charging and discharging system comprises a first motor electric control circuit which is suitable for being electrically connected with a battery assembly and is used for enabling the battery assembly to charge and discharge so as to achieve self-heating; and the second motor electric control circuit is suitable for being electrically connected with the battery assembly and a charging port and is used for converting the voltage input by the charging port so as to charge the battery assembly. According to the charging and discharging system, the power assembly and the vehicle, self-heating of the battery and voltage increasing and decreasing of charging are achieved by multiplexing the two motor electric control circuits, and the cost can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically to a charging and discharging system, a powertrain, and a vehicle. Background Art

[0002] In recent years, due to the advocacy of low-carbon emissions in China and even the world, new energy vehicles have been widely promoted. As an important component of new energy vehicles, the life and charging and discharging capacity of power batteries directly affect the performance of electric vehicles.

[0003] When the power battery pack is in a low temperature environment, its charge and discharge performance will be significantly reduced, and the battery capacity will also be greatly reduced. In addition, if it works in a low temperature environment for a long time, the capacity of the power battery will decrease, which may cause permanent damage to the power battery. Therefore, it is very necessary to preheat the power battery pack before charging and discharging in a low temperature environment.

[0004] At the same time, since the output capacity of charging piles from different manufacturers may be different, when an electric vehicle is charged with a high-voltage charging pile with a voltage higher than the power battery pack, the charging pile cannot output at maximum power; and when an electric vehicle is connected to a low-voltage charging pile with a voltage lower than the power battery pack, the power battery pack cannot be charged normally.

[0005] At present, special self-heating circuits and buck-boost circuits are usually installed on vehicles to achieve self-heating of the power battery pack and conversion of the charging voltage, which is relatively costly. Utility Model Content

[0006] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0007] In order to at least partially solve the above problems, according to a first aspect of the present utility model, a charging and discharging system is provided, comprising:

[0008] a first motor electronic control circuit, adapted to be electrically connected to the battery assembly, and used to charge and discharge the battery assembly to achieve self-heating; and

[0009] The second motor electronic control circuit is suitable for being electrically connected to the battery assembly and the charging port, and is used for converting the voltage input from the charging port to charge the battery assembly.

[0010] Exemplarily, the battery assembly includes a first battery and a second battery, and the charging and discharging system further includes a first switch and a second switch;

[0011] The first end of the first switch is adapted to be electrically connected to the first end of the first battery;

[0012] The first end of the second switch is adapted to be electrically connected to the second end of the second battery;

[0013] The first motor electronic control circuit is electrically connected to the second end of the first switch and the second end of the second switch, and the first motor electronic control circuit is adapted to be electrically connected to the second end of the first battery and the first end of the second battery;

[0014] The second motor electronic control circuit is electrically connected to the second end of the first switch and the second end of the second switch.

[0015] Exemplarily, the first motor electronic control circuit includes a first motor inverter and a first motor inductor, and the charging and discharging system further includes a third switch;

[0016] The first bus terminal of the first motor inverter is electrically connected to the second end of the first switch, the second bus terminal of the first motor inverter is electrically connected to the second end of the second switch, and the midpoint of the bridge arm of the first motor inverter is electrically connected to the first end of the first motor inductor;

[0017] The second end of the first motor inductor is electrically connected to the first end of the third switch;

[0018] The second end of the third switch is adapted to be electrically connected to the second end of the first battery and the first end of the second battery.

[0019] Exemplarily, the second motor electronic control circuit includes a second motor inverter and a second motor inductor, and the charging and discharging system further includes a fourth switch, a fifth switch and a sixth switch;

[0020] The first bus terminal of the second motor inverter is electrically connected to the second end of the first switch and the first end of the fourth switch, the second bus terminal of the second motor inverter is electrically connected to the second end of the second switch and the first end of the fifth switch, and the midpoint of the bridge arm of the second motor inverter is electrically connected to the first end of the second motor inductor;

[0021] The second end of the second motor inductor is electrically connected to the first end of the sixth switch;

[0022] A second end of the fourth switch is electrically connected to a first charging terminal in the charging port;

[0023] The second end of the fifth switch is electrically connected to the second charging terminal in the charging port;

[0024] The second end of the sixth switch is electrically connected to the first charging terminal of the charging port.

[0025] Exemplarily, the charging and discharging system further includes a seventh switch, a first end of the seventh switch being electrically connected to a first end of the first switch, and a second end of the seventh switch being electrically connected to a second end of the second motor inductor.

[0026] Exemplarily, the second motor electronic control circuit includes a second motor inverter and a second motor inductor, and the charging and discharging system further includes a fourth switch;

[0027] The first bus terminal of the second motor inverter is electrically connected to the second end of the first switch and the first charging terminal in the charging port, the second bus terminal of the second motor inverter is electrically connected to the second end of the second switch and the second charging terminal in the charging port, and the midpoint of the bridge arm of the second motor inverter is electrically connected to the first end of the second motor inductor;

[0028] The second end of the second motor inductor is electrically connected to the first end of the fourth switch;

[0029] The second end of the fourth switch is electrically connected to the first end of the first switch.

[0030] Exemplarily, the charging and discharging system further includes a bus capacitor, a first end of the bus capacitor is electrically connected to the second end of the first switch, and a second end of the bus capacitor is electrically connected to the second end of the second switch.

[0031] Exemplarily, the charge and discharge system further includes a pre-charge resistor and a pre-charge switch, wherein the pre-charge resistor and the pre-charge switch are arranged in series, and the pre-charge resistor and the pre-charge switch are integrally connected in parallel to both ends of the first switch.

[0032] According to a second aspect of the utility model, a powertrain is provided, which includes the charging and discharging system as described above.

[0033] According to a third aspect of the utility model, a vehicle is provided, which includes the power assembly as described above.

[0034] According to the charging and discharging system, powertrain and vehicle of the utility model, self-heating of the battery assembly and conversion of the charging voltage are respectively realized by reusing two motor electronic control circuits, without the need to additionally configure a special self-heating circuit and a buck-boost circuit, which can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the device and principle of the present application. In the drawings,

[0036] Figure 1 is a schematic structural block diagram of a charging and discharging system according to an embodiment of the present application;

[0037] Figure 2 is a circuit diagram of a charging and discharging system according to an embodiment of the present application;

[0038] Figure 3-Figure 6 A schematic diagram of the timing of current flow when the charging and discharging system according to an embodiment of the present application realizes self-heating of a battery assembly;

[0039] Figure 7 A schematic diagram of current flow during pre-charging of a charging and discharging system according to an embodiment of the present application;

[0040] Figure 8 A schematic diagram of current flow during direct charging of a charging and discharging system according to an embodiment of the present application;

[0041] Figure 9-10 A schematic diagram of the timing of current flow during boost charging of a charging and discharging system according to an embodiment of the present application;

[0042] Figure 11-Figure 12 A schematic diagram of the timing of current flow during step-down charging of a charging and discharging system according to an embodiment of the present application;

[0043] Fig.13 is a circuit diagram of a charging and discharging system according to another embodiment of the present application;

[0044] Fig.14 Schematic diagram of a circuit of a charging and discharging system according to another embodiment of the present application.

[0045] Description of reference numerals:

[0046] 100 -battery assembly, 200 -first motor electronic control circuit, 210 -first motor inverter, 220 -first motor inductor, 300 -second motor electronic control circuit, 310 -second motor inverter, 320 -second motor inductor, 400 -charging port, 500 -charging pile. DETAILED DESCRIPTION

[0047] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0048] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0049] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0050] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation shown in the figures.

[0051] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0052] See attached Figure 1-12 An exemplary description is given of a charging and discharging system according to an embodiment of the present application.

[0053] See attached Figure 1 The battery charging and discharging system includes a first motor electronic control circuit 200 and a second motor electronic control circuit 300 .

[0054] The first motor electronic control circuit 200 is suitable for being electrically connected to the battery assembly 100, and is used to charge and discharge the battery assembly 100 to achieve self-heating. The first motor electronic control circuit 200 may include a circuit structure in a first motor and a first motor controller. The battery assembly 100 can generate heat by continuously charging and discharging the battery cell itself, thereby achieving self-heating, and further, can effectively adapt to low temperature environments and extend the service life of the battery assembly 100.

[0055] The second motor electronic control circuit 300 is suitable for being electrically connected to the battery assembly 100 and the charging port 400, and is used to convert the voltage input from the charging port 400 to charge the battery assembly 100. The charging port 400 is used to connect to the charging post 500, and the second motor electronic control circuit 300 may include a second motor and a circuit structure in a second motor controller, which is used to step up and / or step down the voltage from the charging port 400, so that it can be compatible with charging posts 500 of different voltage models, improve their charging convenience, and enable the battery assembly 100 to obtain a more ideal charging efficiency.

[0056] According to the charging and discharging system of this embodiment, the self-heating of the battery assembly 100 and the conversion of the charging voltage are realized respectively by reusing two motor electronic control circuits, without the need to configure a special self-heating circuit and a buck-boost circuit, which can effectively reduce costs. The charging system according to this embodiment can be applied to electric vehicles with dual motors, and its two motors and two motor controllers are reused to realize the self-heating of the battery assembly 100 and the conversion of the charging voltage, which can effectively reduce costs. Furthermore, it can effectively solve the problem of insufficient output power of the charging pile when the battery assembly is connected to a high-voltage charging pile for charging, and the problem of being unable to charge when connected to a low-voltage charging pile, so that the battery assembly can be compatible with charging piles of different voltage models, improve its charging convenience, and at the same time enable the battery assembly to obtain a more ideal charging efficiency.

[0057] See attached Figure 2 In this embodiment, the battery assembly 100 includes a first battery Bat1 and a second battery Bat2, and the charge and discharge system further includes a first switch K1 and a second switch K2. The first end of the first switch K1 is suitable for being electrically connected to the first end of the first battery Bat1, and the first end of the second switch K2 is suitable for being electrically connected to the second end of the second battery Bat2. The second end of the first battery Bat1 is electrically connected to the first end of the second battery Bat2. The first motor electronic control circuit 200 is electrically connected to the second end of the first switch K1 and the second end of the second switch K2, and the first motor electronic control circuit 200 is suitable for being electrically connected to the second end of the first battery Bat1 and the first end of the second battery Bat2, and the second motor electronic control circuit 300 is electrically connected to the second end of the first switch K2 and the second end of the second switch K2.

[0058] Exemplarily, the first battery Bat1 and the second battery Bat2 may be power batteries, wherein the first battery Bat1 and the second battery Bat2 may be two independent batteries or two half packs of a battery.

[0059] Exemplarily, the first switch K1 and the second switch K2 may be the main positive relay and the main negative relay, respectively. The first end of the first battery Bat1 and the second battery Bat2 as a whole are electrically connected to the first motor electric control circuit 200 and the second motor electric control circuit 300 through the main positive relay, and the second end of the first battery Bat1 and the second battery Bat2 as a whole are electrically connected to the first motor electric control circuit 200 and the second motor electric control circuit 300 through the main negative relay. When the first switch K1 and the second switch K2 are both turned on, the first battery Bat1 and the second battery Bat2 can supply power to the first motor electric control circuit 200 and the second motor electric control circuit 300 so that they can normally realize the functions of the motor and the motor controller. In an emergency, the first switch K1 and the second switch K2 need to be disconnected to ensure safety. In some embodiments, the first switch K1 and the second switch K2 may be the main positive contactor and the main negative contactor, respectively.

[0060] Since the first motor electronic control circuit 200 is electrically connected to the first end of the first battery Bat1 through the first switch K1, and is electrically connected to the second end of the second battery Bat2 through the second switch K2, and is also connected to the second end of the first battery Bat1 and the first end of the second battery Bat2, the first motor electronic control circuit 200 can be controlled to discharge the first battery Bat1 and charge the second battery Bat2 through the first motor electronic control circuit 200, and the second battery Bat2 is discharged to charge the first battery Bat1 through the first motor electronic control circuit 200, and this cycle is repeated, so that the first battery Bat1 and the second battery Bat2 are continuously charged and discharged, and heat is generated by the impedance of the battery cell itself, thereby realizing self-heating of the first battery Bat1 and the second battery Bat2.

[0061] See attached Figure 2 In this embodiment, the first motor electric control circuit 200 includes a first motor inverter 210 and a first motor inductor 220, and the charge and discharge system also includes a third switch K3. The first motor inverter 210 is a device in the first motor controller, which includes a first bridge arm, a second bridge arm and a third bridge arm. The first bridge arm includes a switch tube Q1 and a switch tube Q2 arranged in series, the second bridge arm includes a switch tube Q3 and a switch tube Q4 arranged in series, and the third bridge arm includes a switch tube Q5 and a switch tube Q6 arranged in series. The first motor inductor 220 is a three-phase stator winding inductor in the first motor, which includes a first phase inductor L1, a second phase inductor L2 and a third phase inductor L3. The third switch K3 can be a contactor or a relay.

[0062] The first bus terminal of the first motor inverter 210 (i.e., the first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm) is electrically connected to the second end of the first switch K1, and the second bus terminal of the first motor inverter 210 (i.e., the second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm) is electrically connected to the second end of the second switch K2. The midpoint of the bridge arm of the first motor inverter 210 is electrically connected to the first end of the first motor inductor 220, that is, the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm are electrically connected to the first end of the first phase inductor L1, the first end of the second phase inductor L2, and the first end of the third phase inductor L3, respectively. The second end of the first motor inductor 220 is electrically connected to the first end of the third switch K3, that is, the second end of the first phase inductor L1, the second end of the second phase inductor L2, and the second end of the third phase inductor L3 are electrically connected to the first end of the third switch K3 at the same time. The second end of the third switch K3 is adapted to be electrically connected to the second end of the first battery Bat1 and the first end of the second battery Bat2.

[0063] Please refer to the attached Figure 3-6 The self-heating process of the battery assembly 100 is described in detail.

[0064] Time series 1: Figure 3 As shown, the first switch K1, the second switch K2 and the third switch K3 are turned on first, and then the switch tube Q1 of the first bridge arm is controlled to be turned on, and the first battery Bat1, the first switch K1, the switch tube Q1 and the first phase inductor L1 form a closed loop. At this time, the first battery Bat1 is discharged to charge the first phase inductor L1.

[0065] Time series 2: Figure 4 As shown, the switch tube Q1 of the first bridge arm is turned off, and the first phase inductor L1, the third switch K3, the second battery Bat2, the second switch K2 and the switch tube Q2 form a closed loop. At this time, due to the freewheeling effect of the inductor, the first phase inductor L1 is discharged to charge the second battery Bat2.

[0066] Time series 3: Figure 5 As shown, the switch tube Q2 of the first bridge arm is turned on, and the first phase inductor L1, the third switch K3, the second battery Bat2, the second switch K2 and the switch tube Q2 form a closed loop. At this time, the second battery Bat2 is discharged to charge the first phase inductor L1.

[0067] Time series 4: Figure 6 As shown, the switch tube Q2 of the first bridge arm is turned off, and the first phase inductor L1, the switch tube Q1, the first switch K1 and the first battery Bat1 form a closed loop. At this time, due to the freewheeling effect of the inductor, the first phase inductor L1 is discharged to charge the first battery Bat1.

[0068] Similarly, the same method is used to control the on and off of the switch tubes Q3 and Q4 of the second bridge arm, and the first battery Bat1 and the second battery Bat2 are charged and discharged twice through the second phase inductor L2. Then, the same control method is used to control the on and off of the switch tubes Q5 and Q6 of the third bridge arm, and the first battery Bat1 and the second battery Bat2 are charged and discharged once through the third phase inductor L3. By adopting the above method, by controlling the on and off of the switch tubes in the three bridge arms of the motor inverter and the one-phase inductance connected to each, each phase inductance of the first motor is charged and discharged in turn, and by controlling the on time of each switch tube, the first battery Bat1 and the second battery Bat2 are continuously charged and discharged with each other, and the impedance of the battery cell itself is used to generate heat in such a repeated charging and discharging process, thereby realizing the self-heating of the first battery Bat1 and the second battery Bat2.

[0069] Similarly, in the above process, when the switch tube Q1 of the first bridge arm is controlled to be turned on and off so that the first phase inductor L1 connected to it completes a charge and discharge, that is, at timing 3, the switch tube Q4 of the second bridge arm can be selected to be turned on, and then the second phase inductor L2 is charged and discharged once through the same control method, and then the switch tube Q5 of the third bridge arm is turned on, and then the third phase inductor L3 is charged and discharged once through the same control method. In this way, the three-phase inductance is used in turn to perform charge and discharge once. By controlling the conduction time of each switch tube, the first battery Bat1 and the second battery Bat2 can also be charged and discharged at high frequency, thereby realizing self-heating of the battery pack.

[0070] To sum up, while ensuring that the heat dissipation and temperature of the first motor inductor 220 are within an acceptable range, by reasonably setting the number of charge and discharge times of each phase inductor when each phase inductor is used in sequence, and then controlling the corresponding switching tube to be turned on and off, the first battery Bat1 and the second battery Bat2 can be charged and discharged with each other, thereby achieving self-heating of the battery pack.

[0071] See attached Figure 2 In this embodiment, the second motor electronic control circuit 300 includes a second motor inverter 310 and a second motor inductor 320, and the charging and discharging system also includes a fourth switch K4, a fifth switch K5, a sixth switch K6 and a seventh switch K7.

[0072] The second motor inverter 310 is a device in the second motor controller, which includes a fourth bridge arm, a fifth bridge arm and a sixth bridge arm, the fourth bridge arm includes a switch tube Q7 and a switch tube Q8 arranged in series, the fifth bridge arm includes a switch tube Q9 and a switch tube Q10 arranged in series, and the sixth bridge arm includes a switch tube Q11 and a switch tube Q12 arranged in series. The second motor inductor 320 is a three-phase stator winding inductor in the second motor, which includes a fourth phase inductor L4, a fifth phase inductor L5 and a sixth phase inductor L6. The fourth switch K4, the fifth switch K5 and the sixth switch K6 can be contactors or relays.

[0073] The first bus terminal of the second motor inverter 310 (i.e., the first end of the fourth bridge arm, the first end of the fifth bridge arm, and the first end of the sixth bridge arm) is electrically connected to the second end of the first switch K1 and the first end of the fourth switch K4. The second bus terminal of the second motor inverter 310 (i.e., the second end of the fourth bridge arm, the second end of the fifth bridge arm, and the second end of the sixth bridge arm) is electrically connected to the second end of the second switch K2 and the first end of the fifth switch K5. The midpoint of the bridge arm of the second motor inverter 310 is electrically connected to the first end of the second motor inductor 320, that is, the midpoint of the fourth bridge arm, the midpoint of the fifth bridge arm, and the midpoint of the sixth bridge arm are electrically connected to the first end of the fourth phase inductor L4, the first end of the fifth phase inductor L5, and the first end of the sixth phase inductor L6, respectively. The second end of the second motor inductor 320 is electrically connected to the first end of the sixth switch K6, that is, the second end of the fourth phase inductor L4, the second end of the fifth phase inductor L5, and the second end of the sixth phase inductor L6 are electrically connected to the first end of the sixth switch K6 at the same time. The second end of the fourth switch K4 is electrically connected to the first charging terminal T1 in the charging port 400, the second end of the fifth switch K5 is electrically connected to the second charging terminal T2 in the charging port 400, and the second end of the sixth switch K6 is electrically connected to the first charging terminal T1 in the charging port 400. The first charging terminal T1 and the second charging terminal T2 may be a positive terminal and a negative terminal, respectively, and the first charging terminal T1 and the second charging terminal T2 may be used to connect to the charging pile 500 to receive power from the charging pile 500. The first end of the seventh switch K7 is electrically connected to the first end of the first switch K1, that is, electrically connected to the first end of the first battery Bat1, and the second end of the seventh switch K7 is electrically connected to the second end of the second motor inductor 320, that is, electrically connected to the second end of the fourth phase inductor L4, the second end of the fifth phase inductor L5, and the second end of the sixth phase inductor L6 at the same time.

[0074] Please refer to the attached Figure 8Direct charging is exemplified. Direct charging means that the voltage of the first battery Bat1 and the second battery Bat2 matches the output voltage of the charging pile 500, and the first battery Bat1 and the second battery Bat2 are charged without stepping up or down. At this time, the first switch K1 is controlled to be turned on, the second switch K2 is controlled to be turned on, the fourth switch K4 is controlled to be turned on, and the fifth switch K5 is controlled to be turned on. At this time, the charging pile 500, the first charging terminal T1, the fourth switch K4, the first switch K1, the first battery Bat1, the second battery Bat2, the second switch K2, the fifth switch K5 and the second charging terminal T2 form a closed loop, and the charging pile 500 directly charges the first battery Bat1 and the second battery Bat2.

[0075] Please refer to the attached Fig. 9 , 10 The process of boost charging is exemplified.

[0076] Time series 1: Fig. 9 As shown, the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 are turned on first, and then the switch tube Q8 of the fourth bridge arm is controlled to be turned on, and the charging pile 500, the first charging terminal T1, the fourth phase inductor L4, the switch tube Q8, the fifth switch K5 and the second charging terminal T2 form a closed loop. At this time, the charging pile 500 charges the fourth phase inductor L4.

[0077] Time series 2: Fig.10 As shown, the switch tube Q8 of the fourth bridge arm is turned off, and the charging pile 500, the first charging terminal T1, the fourth phase inductor L4, the switch tube Q7, the first switch K1, the first battery Bat1, the second battery Bat2, the second switch K2, the fifth switch K5 and the second charging terminal T2 form a closed loop. At this time, the charging pile 500 charges the first battery Bat1 and the second battery Bat2 through the boost circuit formed by the fourth phase inductor L4, and the charging voltage is increased.

[0078] Similarly, by controlling the on and off of the switch tube Q10 of the fifth bridge arm, the charging and discharging of the fifth phase inductor L5 is performed by the charging pile 500 through the fifth phase inductor L5 to form a boost circuit to charge the first battery Bat1 and the second battery Bat2. Then, the same method is used to control the on and off of the switch tube Q12 of the sixth bridge arm, and the charging and discharging of the sixth phase inductor L6 is performed by the charging pile 500 through the sixth phase inductor L6 to form a boost circuit to charge the first battery Bat1 and the second battery Bat2. Then, by using each phase inductor for charging and discharging in turn, that is, by controlling the on and off of the corresponding switch tube, the charging pile 500 and the inductor can form a boost circuit, the charging voltage can be increased, and the boost charging of the first battery Bat1 and the second battery Bat2 can be completed. That is, the voltage input to the charging port 400 is increased to charge the first battery Bat1 and the second battery Bat2.

[0079] Please refer to the attached Fig.10 , 11 The process of step-down charging is exemplified.

[0080] Time series 1: Fig.11 As shown, first control the second switch K2 to be turned on, the fourth switch K4 to be turned on, the fifth switch K5 to be turned on, and the seventh switch K7 to be turned on, and then control the switch tube Q7 of the fourth bridge arm to be turned on, and the charging pile 500, the first charging terminal T1, the fourth switch K4, the switch tube Q7, the fourth phase inductor L4, the seventh switch K7, the first battery Bat1, the second battery Bat2, the second switch K2, the fifth switch K5 and the second charging terminal T2 form a closed loop. At this time, the charging pile 500 charges the battery pack through the fourth phase inductor L4 to form a step-down circuit.

[0081] Time series 2: Fig.12 As shown, the fourth switch K4 and the fifth switch K5 are disconnected, the switch tube Q7 of the fourth bridge arm is controlled to be turned off, and the fourth phase inductor L4, the seventh switch K7, the first battery Bat1, the second battery Bat2, the second switch K2 and the switch tube Q8 form a closed loop. At this time, the fourth phase inductor L4 is discharged to step down and charge the first battery Bat1 and the second battery Bat2.

[0082] Similar to the boost charging, the switch tube Q9 of the fifth bridge arm is turned on and off, and the charging pile 500 charges the first battery Bat1 and the second battery Bat2 through the fifth phase inductor L5 to form a step-down circuit. The charging voltage is reduced by the charging and discharging action of the fifth phase inductor L5. Then, the switch tube Q11 of the sixth bridge arm is turned on and off in the same way, and the charging pile 500 charges the first battery Bat1 and the second battery Bat2 through the sixth phase inductor L6 to form a step-down circuit. The charging voltage is reduced by the charging and discharging action of the sixth phase inductor L6. Then, by using each phase inductor for charging and discharging in turn, that is, by controlling the corresponding switch tube to turn on and off, the charging pile 500 and the inductor can form a step-down circuit to reduce the charging voltage and complete the step-down charging of the first battery Bat1 and the second battery Bat2. That is, the voltage input to the charging port 400 is reduced to charge the first battery Bat1 and the second battery Bat2.

[0083] In this embodiment, the charging and discharging system further includes a bus capacitor C1 and a bus capacitor C2, the first end of the bus capacitor C1 and the first end of the bus capacitor C2 are both electrically connected to the second end of the first switch K1, and the second end of the bus capacitor C1 and the second end of the bus capacitor C2 are both electrically connected to the second end of the second switch K2. The bus capacitor C1 and the bus capacitor C2 are set to smooth the bus voltage, weaken the peak voltage, and absorb high pulse current. The bus capacitor C1 and the bus capacitor C2 can reuse the bus voltage in the first motor controller and the second motor controller respectively.

[0084] In this embodiment, the charging and discharging system further includes a pre-charging resistor R8 and a pre-charging switch K8, which are arranged in series, and the pre-charging resistor R8 and the pre-charging switch K8 are connected in parallel to both ends of the first switch K1. Before charging the first battery Bat1 and the second battery Bat2 through the charging pile 500, a pre-charging step can be performed to maintain the voltage of the bus capacitor C1 and the bus capacitor C2 within a specific range. Figure 7 The pre-charging process is exemplified. During pre-charging, the second switch K2 and the pre-charging switch K8 are controlled to be turned on, and the bus capacitors C1 and C2 are charged by the first battery Bat1 and the second battery Bat2 so that their voltages are within a specific range.

[0085] Refer to the attached Fig.13In another embodiment of the present application, the second motor control circuit 300 includes a second motor inverter 310 and a second motor inductor 320, and the charge and discharge system further includes a fourth switch K4, a fifth switch K5 and a sixth switch K6, but does not include the seventh switch K7. The connection method of the second motor inverter 310, the second motor inductor 320, the fourth switch K4, the fifth switch K5 and the sixth switch K6 is the same as that of the above embodiment, and will not be repeated here. Fig.13 In the illustrated embodiment, the charging pile 500 can only directly charge and boost charge the first battery Bat1 and the second battery Bat2 through the second motor electronic control circuit 300. The specific process of direct charging and boost charging is similar to the above embodiment and will not be repeated here.

[0086] See attached Fig.14 In another embodiment of the present application, the second motor electronic control circuit 300 includes a second motor inverter 310 and a second motor inductor 320, and the charging and discharging system further includes a fourth switch K4.

[0087] The second motor inverter 310 is a device in the second motor controller, which includes a fourth bridge arm, a fifth bridge arm and a sixth bridge arm, the fourth bridge arm includes a switch tube Q7 and a switch tube Q8 arranged in series, the fifth bridge arm includes a switch tube Q9 and a switch tube Q10 arranged in series, and the sixth bridge arm includes a switch tube Q11 and a switch tube Q12 arranged in series. The second motor inductor 320 is a three-phase stator winding inductor in the second motor, which includes a fourth phase inductor L4, a fifth phase inductor L5 and a sixth phase inductor L6. The fourth switch K4 can be a contactor or a relay.

[0088] The first bus terminal of the second motor inverter 310 is electrically connected to the second end of the first switch K1 and the first charging terminal T1 in the charging port 400, the second bus terminal of the second motor inverter 310 is electrically connected to the second end of the second switch K2 and the second charging terminal T2 in the charging port 400, and the bridge arm midpoint of the second motor inverter 310 is electrically connected to the first end of the second motor inductor 320. The second end of the second motor inductor 320 is electrically connected to the first end of the fourth switch K4, and the second end of the fourth switch K4 is electrically connected to the first end of the first switch K1, that is, to the first end of the first battery Bat1. The fourth switch K4 in this embodiment is equivalent to the seventh switch K7 in the above embodiment. For the attached Fig.14 In the illustrated embodiment, the charging pile 500 can only directly charge and step-down charge the first battery Bat1 and the second battery Bat2 through the second motor electronic control circuit 300. The specific process of direct charging and step-down charging is similar to the above embodiment and will not be repeated here.

[0089] The present application also provides a powertrain, which includes the charging and discharging system as described above.

[0090] The present application also provides a vehicle, which includes the powertrain as described above, and the vehicle may be a dual-motor vehicle.

[0091] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0092] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0093] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various utility model aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features explicitly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features that are less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0094] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0095] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0096] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A charging and discharging system, characterized in that: include: a first motor electronic control circuit, adapted to be electrically connected to the battery assembly, and used to charge and discharge the battery assembly to achieve self-heating; as well as a second motor electronic control circuit, adapted to be electrically connected to the battery assembly and the charging port, and used to convert a voltage input from the charging port to charge the battery assembly; Wherein, the battery assembly includes a first battery and a second battery; The first motor electronic control circuit includes a first motor inverter and a first motor inductor; The second motor electronic control circuit includes a second motor inverter and a second motor inductor.

2. The charging and discharging system according to claim 1, characterized in that: The charging and discharging system further includes a first switch and a second switch; The first end of the first switch is adapted to be electrically connected to the first end of the first battery; The first end of the second switch is adapted to be electrically connected to the second end of the second battery; The first motor electronic control circuit is electrically connected to the second end of the first switch and the second end of the second switch, and the first motor electronic control circuit is adapted to be electrically connected to the second end of the first battery and the first end of the second battery; The second motor electronic control circuit is electrically connected to the second end of the first switch and the second end of the second switch.

3. The charging and discharging system according to claim 2, characterized in that: The charging and discharging system further includes a third switch; The first bus terminal of the first motor inverter is electrically connected to the second end of the first switch, the second bus terminal of the first motor inverter is electrically connected to the second end of the second switch, and the midpoint of the bridge arm of the first motor inverter is electrically connected to the first end of the first motor inductor; The second end of the first motor inductor is electrically connected to the first end of the third switch; The second end of the third switch is adapted to be electrically connected to the second end of the first battery and the first end of the second battery.

4. The charging and discharging system according to claim 2, characterized in that: The charging and discharging system further includes a fourth switch, a fifth switch and a sixth switch; The first bus terminal of the second motor inverter is electrically connected to the second end of the first switch and the first end of the fourth switch, the second bus terminal of the second motor inverter is electrically connected to the second end of the second switch and the first end of the fifth switch, and the midpoint of the bridge arm of the second motor inverter is electrically connected to the first end of the second motor inductor; The second end of the second motor inductor is electrically connected to the first end of the sixth switch; The second end of the fourth switch is electrically connected to the first charging terminal in the charging port; The second end of the fifth switch is electrically connected to the second charging terminal in the charging port; The second end of the sixth switch is electrically connected to the first charging terminal of the charging port.

5. The charging and discharging system according to claim 4, characterized in that: The charging and discharging system further includes a seventh switch, a first end of the seventh switch is electrically connected to the first end of the first switch, and a second end of the seventh switch is electrically connected to the second end of the second motor inductor.

6. The charging and discharging system according to claim 2, characterized in that: The second motor electronic control circuit includes a second motor inverter and a second motor inductor, and the charging and discharging system also includes a fourth switch; The first bus terminal of the second motor inverter is electrically connected to the second end of the first switch and the first charging terminal in the charging port, the second bus terminal of the second motor inverter is electrically connected to the second end of the second switch and the second charging terminal in the charging port, and the midpoint of the bridge arm of the second motor inverter is electrically connected to the first end of the second motor inductor; The second end of the second motor inductor is electrically connected to the first end of the fourth switch; The second end of the fourth switch is electrically connected to the first end of the first switch.

7. The charging and discharging system according to any one of claims 2 to 6, characterized in that: The charging and discharging system further includes a bus capacitor, a first end of the bus capacitor is electrically connected to the second end of the first switch, and a second end of the bus capacitor is electrically connected to the second end of the second switch.

8. The charging and discharging system according to claim 7, characterized in that: The charging and discharging system further includes a pre-charging resistor and a pre-charging switch, wherein the pre-charging resistor and the pre-charging switch are arranged in series, and the pre-charging resistor and the pre-charging switch are integrally connected in parallel to both ends of the first switch.

9. A powertrain, characterized in that: The invention comprises a charging and discharging system as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the powertrain as claimed in claim 9.

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