Power system, control method for power system and vehicle

Abstract

A power system (100), comprising power batteries (10), controllers (20) and drive motors (30). The power batteries comprise a first power battery (11) and a second power battery (12), a negative electrode of the first power battery being connected to a positive electrode of the second power battery, and a negative electrode of the second power battery being adapted to be connected to a negative electrode of a charging port. The controllers comprise a first controller (21) and a second controller (22), the first controller and the second controller being selectively connected between a positive electrode of the first power battery and the negative electrode of the second power battery, the first controller being adapted to be connected between a positive electrode of the charging port and the negative electrode of the charging port, and the second controller being adapted to be connected between the positive electrode of the charging port and the negative electrode of the charging port. The drive motors comprise a first drive motor (31) and a second drive motor (32), wherein one end of the first drive motor is selectively connected to the positive electrode of the first power battery, or is selectively connected to the negative electrode of the first power battery and the positive electrode of the second power battery; and one end of the second drive motor is selectively connected to the negative electrode of the first power battery and the positive electrode of the second power battery, or is adapted to be connected to the positive electrode of the first power battery. Also disclosed are a control method for a power system, and a vehicle comprising a power system. The power system can prevent voltage impact on external charging ports under all working conditions, thus ensuring the safety and reliability of charging and self-heating of power systems.

Description

Powertrain system, powertrain control methods and vehicle

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application filed on July 9, 2024, with application number 202410915651.7, entitled "Power System, Control Method for Power System and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of vehicle technology, and in particular to a power system, a control method for the power system, and a vehicle. Background Technology

[0004] With the development of science and technology, lithium batteries have become the mainstream power batteries. However, in cold regions or winter environments, low temperatures can affect the activity of lithium ions in lithium batteries, which can significantly impact the driving range and charging / discharging performance of new energy vehicles. More seriously, it can lead to accidents that endanger driving safety, such as power limitation during driving and the inability of vehicles with automatic start-stop functions to start their engines.

[0005] To ensure the performance of lithium batteries under low-temperature conditions, existing technologies typically employ the operation of electrical equipment such as engines, motors, or inverters to generate heat, which is then transferred to the battery via a cooling system, or a heating module is added outside the battery system.

[0006] In related technologies, heating methods that utilize heat generated by other devices or modules require the generation of alternating positive and negative high-frequency currents on the DC side, resulting in poor control precision, low efficiency, and increased system costs. Furthermore, the self-heating operation of the battery during charging can cause significant voltage surges to the charging equipment.

[0007] Public content

[0008] This disclosure aims to address at least one of the technical problems existing in the prior art. To this end, this disclosure proposes a power system that can improve the efficiency of self-heating of a power battery.

[0009] This disclosure further proposes a control method for a dynamic system.

[0010] This disclosure further proposes a vehicle with a power system.

[0011] A power system according to an embodiment of this disclosure includes: a power battery, comprising a first power battery and a second power battery, wherein the negative terminal of the first power battery is connected to the positive terminal of the second power battery, and the negative terminal of the second power battery is adapted to be connected to the negative terminal of a charging port; a controller, comprising a first controller and a second controller, wherein the first controller and the second controller are selectively connected between the positive terminal of the first power battery and the negative terminal of the second power battery, wherein the first controller is adapted to be connected between the positive terminal of the charging port and the negative terminal of the charging port, and the second controller is adapted to be connected between the positive terminal of the charging port and the negative terminal of the charging port; and a drive motor, comprising a first drive motor and a second drive motor, wherein one end of the first drive motor is connected to the first controller, and the other end is selectively connected to the positive terminal of the first power battery, or selectively connected between the negative terminal of the first power battery and the positive terminal of the second power battery; wherein one end of the second drive motor is connected to the second controller, and the other end is selectively connected between the negative terminal of the first power battery and the positive terminal of the second power battery, or adapted to be connected to the positive terminal of the charging port.

[0012] Therefore, by connecting the first and second drive motors between the negative and positive terminals of the first and second power batteries, one of the first and second power batteries can output electrical energy to the first or second drive motor. Subsequently, the first or second drive motor can charge the other of the first and second power batteries, and vice versa. During this process, both the first and second power batteries undergo charging and discharging, with the current flowing in opposite directions. This allows the first and second power batteries to generate heat due to their own impedance, achieving the self-heating effect of the power batteries in low-temperature environments as described in this embodiment. Compared to existing technologies, this embodiment allows the power batteries to generate heat through their own impedance, resulting in high self-heating efficiency and eliminating the need for additional self-heating modules and circuits, thus reducing costs.

[0013] According to some embodiments of this disclosure, the first controller includes a plurality of first inverter bridges, and the second controller includes a plurality of second inverter bridges. Each first inverter bridge and each second inverter bridge includes an upper bridge arm and a lower bridge arm connected to each other. The first drive motor includes a plurality of first coil elements, each of which corresponds one-to-one with the plurality of first inverter bridges. One end of each first coil element is electrically connected to the upper bridge arm and the lower bridge arm of the first inverter bridge, and the other end of each first coil element is selectively connected to the positive terminal of the first power battery, or selectively connected to the negative terminal of the first power battery and the positive terminal of the second power battery. The second drive motor includes a plurality of second coil elements, each of which corresponds one-to-one with the plurality of second inverter bridges. One end of each second coil element is electrically connected to the upper bridge arm and the lower bridge arm of the second inverter bridge, and the other end of each second coil element is selectively connected to the negative terminal of the first power battery and the positive terminal of the second power battery, or is adapted to be connected to the positive terminal of the charging port.

[0014] According to some embodiments of this disclosure, the power system further includes a first capacitor connected between the positive terminal of the first power battery and the negative terminal of the second power battery and connected in parallel with a plurality of first inverter bridges; the power system further includes a second capacitor connected between the positive terminal of the first power battery and the negative terminal of the second power battery and connected in parallel with a plurality of second inverter bridges.

[0015] According to some embodiments of this disclosure, the power system further includes a third capacitor adapted to be connected between the positive terminal of the charging port and the negative terminal of the charging port.

[0016] According to some embodiments of this disclosure, the power system further includes a switch, which includes a first switch element and a second switch element. One end of the first switch element is connected to the positive terminal of the first power battery, and the other end of the first switch element is connected to the first controller and the second controller. The first switch element is selectively opened and closed. One end of the second switch element is connected to the negative terminal of the second power battery, and the other end of the second switch element is connected to the first controller and the second controller. The second switch element is selectively opened and closed.

[0017] According to some embodiments of this disclosure, the power system further includes a resistor and a switch, the switch including a ninth switch element, the resistor and the ninth switch element being connected in series and then connected in parallel with the first switch element, the ninth switch element being selectively opened and closed.

[0018] According to some embodiments of this disclosure, the switch includes a third switch element, a fourth switch element, a fifth switch element, and a sixth switch element. The third switch element is adapted to be connected between the first controller and the positive terminal of the charging port, and the third switch element selectively opens and closes. One end of the fourth switch element is connected to the second drive motor, and the other end is connected between the negative terminal of the first power battery and the positive terminal of the second power battery, and the fourth switch element selectively opens and closes. The fifth switch element is adapted to be connected between the second controller and the negative terminal of the charging port, and the fifth switch element selectively opens and closes. The sixth switch element is adapted to be connected between the second drive motor and the positive terminal of the charging port, and the sixth switch element selectively opens and closes.

[0019] According to some embodiments of this disclosure, the switching device includes a seventh switching device and an eighth switching device. The seventh switching device is connected between the first drive motor and the positive terminal of the first power battery, and the seventh switching device selectively opens and closes. One end of the eighth switching device is connected to the first drive motor, and the other end is connected between the negative terminal of the first power battery and the positive terminal of the second power battery, and the eighth switching device selectively opens and closes.

[0020] The power system control method disclosed herein includes the following steps: acquiring the vehicle's operating conditions; controlling the power system to operate in a first operating mode according to the vehicle's operating conditions, wherein, in the first operating mode, a first power battery charges a second power battery, or the second power battery charges the first power battery; wherein, the power system control method is applicable to the power system described above.

[0021] According to some embodiments of this disclosure, the control method of the power system further includes the following steps: controlling the power system to operate in a second working mode according to the vehicle's operating conditions, wherein, in the second working mode, the external charging port charges the first power battery and the second power battery.

[0022] According to some embodiments of this disclosure, controlling the power system to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery charges the second power battery, or the second power battery charges the first power battery, includes: first controlling the first power battery to charge the first drive motor through a first controller; and then controlling the first drive motor to charge the second power battery through the first controller.

[0023] According to some embodiments of this disclosure, the step of first controlling the first power battery to charge the first drive motor through the first controller, and then controlling the first drive motor to charge the second power battery through the first controller, includes: first closing the first switch and the eighth switch, and opening the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the ninth switch, thereby controlling the first power battery to charge the first drive motor through the first controller; then closing the second switch and the eighth switch, and opening the first switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the ninth switch, thereby controlling the first drive motor to charge the second power battery through the first controller.

[0024] According to some embodiments of this disclosure, controlling the power system to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery charges the second power battery, or the second power battery charges the first power battery, includes: first controlling the second power battery to charge the first drive motor through the first controller; and then controlling the first drive motor to charge the first power battery through the first controller.

[0025] According to some embodiments of this disclosure, the step of first controlling the second power battery to charge the first drive motor through the first controller, and then controlling the first drive motor to charge the first power battery through the first controller, includes: first closing the second and eighth switches, and opening the first, third, fourth, fifth, sixth, seventh, and ninth switches, thereby controlling the second power battery to charge the first drive motor through the first controller; then closing the first and eighth switches, and opening the second, third, fourth, fifth, sixth, seventh, and ninth switches, thereby controlling the first drive motor to charge the first power battery through the first controller.

[0026] According to some embodiments of this disclosure, controlling the power system to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery charges the second power battery, or the second power battery charges the first power battery, includes: first controlling the first power battery to charge the second drive motor through a second controller; and then controlling the second drive motor to charge the second power battery through the second controller.

[0027] According to some embodiments of this disclosure, the step of first controlling the first power battery to charge the second drive motor through the second controller, and then controlling the second drive motor to charge the second power battery through the second controller, includes: first closing the first and fourth switches, and opening the second, third, fifth, sixth, seventh, eighth, and ninth switches, thereby controlling the first power battery to charge the second drive motor through the second controller; then closing the second and fourth switches, and opening the first, third, fifth, sixth, seventh, eighth, and ninth switches, thereby controlling the second drive motor to charge the second power battery through the second controller.

[0028] According to some embodiments of this disclosure, controlling the power system to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery charges the second power battery, or the second power battery charges the first power battery, includes: first controlling the second power battery to charge the second drive motor through a second controller; and then controlling the second drive motor to charge the first power battery through the second controller.

[0029] According to some embodiments of this disclosure, the step of first controlling the second power battery to charge the second drive motor through the second controller, and then controlling the second drive motor to charge the first power battery through the second controller, includes: first closing the second and fourth switches, and opening the first, third, fifth, sixth, seventh, eighth, and ninth switches, thereby controlling the second power battery to charge the second drive motor through the second controller; then closing the first and fourth switches, and opening the second, third, fifth, sixth, seventh, eighth, and ninth switches, thereby controlling the second drive motor to charge the first power battery through the second controller.

[0030] According to some embodiments of this disclosure, controlling the power system to operate in a second working mode according to the vehicle's operating conditions, wherein in the second working mode, the external charging port charges the first power battery and the second power battery, includes: first controlling the power supply device to charge the first drive motor through the first controller; and then controlling the first drive motor to charge the first power battery and the second power battery through the first controller.

[0031] According to some embodiments of this disclosure, the step of first controlling the power supply device to charge the first drive motor through the first controller, and then controlling the first drive motor to charge the first power battery and the second power battery through the first controller includes: first closing the second, third, fifth, and seventh switches, and opening the first, fourth, sixth, eighth, and ninth switches, thereby controlling the power supply device to charge the first drive motor through the first controller; then closing the second and seventh switches, and opening the first, third, fourth, fifth, sixth, eighth, and ninth switches, thereby controlling the first drive motor to charge the first power battery and the second power battery through the first controller.

[0032] According to some embodiments of this disclosure, controlling the power system to operate in a second working mode according to the vehicle's operating conditions, wherein in the second working mode, the external charging port charges the first power battery and the second power battery, includes: first controlling the power supply device to charge the second drive motor through the second controller; and then controlling the power supply device and the second drive motor to charge the first power battery and the second power battery through the second controller.

[0033] According to some embodiments of this disclosure, the step of first controlling the power supply device to charge the second drive motor through the second controller, and then controlling the power supply device and the second drive motor to charge the first power battery and the second power battery through the second controller includes: first closing the fifth and sixth switches, and opening the first, second, third, fourth, seventh, eighth, and ninth switches, controlling the power supply device to charge the second drive motor through the second controller; then closing the first, second, fifth, and sixth switches, and opening the third, seventh, eighth, and ninth switches, controlling the power supply device and the second drive motor to charge the first power battery and the second power battery through the second controller.

[0034] According to some embodiments of this disclosure, the power system further includes the following step: controlling the power system to operate in a third operating mode, wherein, in the third operating mode, the power battery charges the first capacitor and the second capacitor.

[0035] According to some embodiments of this disclosure, controlling the power system to operate in a third working mode, wherein in the third working mode, the power battery charges the first capacitor and the second capacitor by: closing the ninth switch and the second switch, and opening the first switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch and the ninth switch, wherein the power battery charges the first capacitor and the second capacitor.

[0036] According to some embodiments of this disclosure, the power system is controlled to first operate in the third operating mode, and then operate in the first operating mode or the second operating mode.

[0037] The vehicle according to this disclosure includes the powertrain described above.

[0038] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0039] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0040] Figure 1 is a schematic diagram of a power system according to an embodiment of the present disclosure;

[0041] Figure 2 is a schematic diagram of a power system according to an embodiment of the present disclosure;

[0042] Figure 3 is a schematic diagram of step S3-1 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0043] Figure 4 is a schematic diagram of step S3-2 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0044] Figure 5 is a schematic diagram of step S3-3 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0045] Figure 6 is a schematic diagram of steps S3-4 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0046] Figure 7 is a schematic diagram of steps S3-5 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0047] Figure 8 is a schematic diagram of steps S3-6 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0048] Figure 9 is a schematic diagram of steps S3-7 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0049] Figure 10 is a schematic diagram of steps S3-8 in the first operating mode of the power system according to an embodiment of the present disclosure;

[0050] Figure 11 is a schematic diagram of step S4-1 in the second operating mode of the power system according to an embodiment of the present disclosure;

[0051] Figure 12 is a schematic diagram of step S4-2 in the second operating mode of the power system according to an embodiment of the present disclosure;

[0052] Figure 13 is a schematic diagram of step S4-3 in the second operating mode of the power system according to an embodiment of the present disclosure;

[0053] Figure 14 is a schematic diagram of step S4-4 in the second operating mode of the power system according to an embodiment of the present disclosure;

[0054] Figure 15 is a schematic diagram of the third operating mode of the power system according to an embodiment of the present disclosure;

[0055] Figure 16 is a flowchart illustrating a control method for a power system according to an embodiment of the present disclosure;

[0056] Figure 17 is a schematic flowchart of the control method for a power system according to an embodiment of the present disclosure, which controls the power system to operate in a first working mode.

[0057] Figure 18 is a schematic flowchart of the control method for a power system according to an embodiment of the present disclosure, which controls the power system to operate in a first working mode.

[0058] Figure 19 is a schematic flowchart of the control method for a power system according to an embodiment of the present disclosure, which controls the power system to operate in a second working mode.

[0059] Figure 20 is a schematic flowchart of the control method for a power system according to an embodiment of the present disclosure, which controls the power system to operate in a second working mode.

[0060] Figure 21 is a schematic block diagram of a vehicle according to an embodiment of the present disclosure.

[0061] Reference numerals: 100, Power system; 200, Power supply device; 300, Vehicle; 10, Power battery; 11, First power battery; 12, Second power battery; 20, Controller; 21, First controller; 211, First inverter bridge; 212, First capacitor; 22, Second controller; 221, Second inverter bridge; 222, Second capacitor; 23, Upper bridge arm; 24, Lower bridge arm; 25, Switching device; 30, Drive motor; 31, First drive motor; 311, First coil; 32, Second drive motor; 321, Second coil; 40, Resistor; 50, Third capacitor; 60, Switch; 61, First switch; 62, Second switch; 63, Third switch; 64, Fourth switch; 65, Fifth switch; 66, Sixth switch; 67, Seventh switch; 68, Eighth switch; 69, Ninth switch. Detailed Implementation

[0062] The embodiments of this disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0063] The following description, with reference to Figures 1-2, describes a power system 100 according to an embodiment of the present disclosure, wherein the power system 100 is configured with a control method for the power system 100.

[0064] Referring to Figures 1 and 2, the power system 100 according to an embodiment of this disclosure mainly includes a power battery 10, a controller 20, and a drive motor 30. The power battery 10 includes a first power battery 11 and a second power battery 12; the controller 20 includes a first controller 21 and a second controller 22; and the drive motor 30 includes a first drive motor 31 and a second drive motor 32. The negative terminal of the first power battery 11 is connected to the positive terminal of the second power battery 12, allowing current to flow between the first power battery 11 and the second power battery 12.

[0065] The negative terminal of the second power battery 12 is adapted to be connected to the negative terminal of the charging port. The first controller 21 is selectively connected between the positive terminal of the first power battery 11 and the negative terminal of the second power battery 12. The first controller 21 is adapted to be connected between the positive terminal and the negative terminal of the charging port. The second controller 22 is adapted to be connected between the positive terminal and the negative terminal of the charging port.

[0066] In embodiments of this disclosure, the charging port is the charging port of the power supply device 200 for supplying power to the power system 100.

[0067] Furthermore, the second controller 22 is selectively connected between the positive terminal of the first power battery 11 and the negative terminal of the second power battery 12, and the second controller 22 is adapted to be connected to the negative terminal of the charging port. This allows the second controller 22, the first controller 21, and the positive terminal of the first power battery 11 to be selectively connected to the positive terminal of the charging port, and the negative terminals of the first controller 21, the second controller 22, and the second power battery 12 to be selectively connected to the negative terminal of the charging port, thereby ensuring the circuit integrity of the power system 100 of this embodiment.

[0068] This configuration allows the current from the power supply device 200 to flow directly to the first power battery 11 and the second power battery 12, enabling the power supply device 200 to directly charge the first power battery 11 and the second power battery 12 in a normal temperature environment.

[0069] On the other hand, the first power battery 11 and the second power battery 12 can each form a circuit with the first controller 21, and the first power battery 11 and the second power battery 12 can each form a circuit with the second controller 22.

[0070] In the embodiments of this disclosure, both the first drive motor 31 and the second drive motor 32 have charging and discharging functions.

[0071] One end of the first drive motor 31 is connected to the first controller 21, and the other end is selectively connected to the positive terminal of the first power battery 11, or selectively connected to the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12. This configuration allows the first drive motor 31 to be connected not only between the first power battery 11 and the first controller 21, but also between the second power battery 12 and the first controller 21. The first controller 21 can be selectively turned on.

[0072] One end of the second drive motor 32 is connected to the second controller 22, and the other end is selectively connected to the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12, or is suitable for connection to the positive terminal of the charging port. This configuration allows the second drive motor 32 to be connected not only between the second controller 22 and the first power battery 11, but also between the second controller 22 and the second power battery 12.

[0073] Therefore, by connecting the first drive motor 31 and the second drive motor 32 between the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12, one of the first power battery 11 and the second power battery 12 can output electrical energy to the first drive motor 31 or the second drive motor 32. Subsequently, the first drive motor 31 or the second drive motor 32 can charge the other of the first power battery 11 and the second power battery 12, and vice versa. This allows the first drive motor 31 or the second drive motor 32 to charge one of the first power battery 11 and the second power battery 12. During this process, both the first power battery 11 and the second power battery 12 undergo charging and discharging processes, and the current flows in opposite directions during charging and discharging. This allows the first power battery 11 and the second power battery 12 to generate heat due to their own impedance, achieving the self-heating effect of the power battery 10 in a low-temperature environment in this embodiment of the present disclosure. Compared with the prior art, the embodiments disclosed herein enable the power battery 10 to generate heat through its own impedance, resulting in high self-heating efficiency. Furthermore, it eliminates the need for additional self-heating modules and circuits, thereby reducing costs.

[0074] Referring to Figures 1 and 2, the first controller 21 includes multiple first inverter bridges 211, and the second controller 22 includes multiple second inverter bridges 221. Each first inverter bridge 211 and each second inverter bridge 221 includes an upper bridge arm 23 and a lower bridge arm 24 that are interconnected. Specifically, in the embodiments of this disclosure, the drive motor 30 includes, but is not limited to, a three-phase motor. By configuring the first controller 21 to include multiple first inverter bridges 211, the first controller 21 can be connected to the three-phase inductors in the motor. Similarly, by configuring the second controller 22 to include multiple second inverter bridges 221, the second controller 22 can be connected to the three-phase inductors in the motor. This configuration allows each inductor to be connected to either the first power battery 11 or the second power battery 12, enabling any inductor in the drive motor 30 to be charged and discharged.

[0075] Furthermore, the first drive motor 31 includes a plurality of first coil elements 311, each corresponding to a plurality of first inverter bridges 211. One end of each first coil element 311 is electrically connected to the upper arm 23 and the lower arm 24 of the first inverter bridge 211, and the other end of each first coil element 311 is selectively connected to the positive terminal of the first power battery 11, or selectively connected to the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12. Thus, the first coil element 311 can be selectively connected between the first power battery 11 and the first controller 21 to form a current loop between the first power battery 11, the first controller 21, and the first coil element 311; or the first coil element 311 can be selectively connected between the second power battery 12 and the first controller 21 to form a current loop between the second power battery 12, the first controller 21, and the first coil element 311.

[0076] In the embodiments of this disclosure, the first controller 21 further includes six switching devices 25, wherein multiple switching devices 25 correspond one-to-one with the upper bridge arms 23 of multiple first inverter bridges 211, and multiple switching devices 25 correspond one-to-one with the lower bridge arms 24 of multiple first inverter bridges 211. Due to the switching characteristics of the switching devices 25 themselves, the bridge arm to which the switching device 25 is located will only be energized when the switching device 25 is turned on. In this way, each upper bridge arm 23 and each lower bridge arm 24 in the first inverter bridge 211 can be equipped with a switching device 25 to control its energization. When current flows into the first inverter bridge 211 of the first controller 21, each switching device 25 can be selectively turned on, so that at least one of the multiple first inverter bridges 211 is turned on. With this configuration, after the first controller 21 is energized, current flows through at least one of the multiple first coil elements 311.

[0077] In addition, by setting up multiple first inverter bridges 211 in this embodiment, and by setting up a switching device 25 on the upper and lower arms of each first inverter bridge 211 to control its conduction, it is possible not only to ensure that each arm of each first inverter bridge 211 can be independently controlled to be powered, but also to improve the power-on efficiency of the first controller 21.

[0078] Furthermore, the second drive motor 32 includes a plurality of second coil elements 321, each corresponding to a plurality of second inverter bridges 221. One end of each second coil element 321 is electrically connected to the upper arm 23 and the lower arm 24 of the second inverter bridge 221, and the other end of each second coil element 321 is selectively connected to the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12, or is suitable for connection to the positive terminal of the charging port. Thus, the second coil elements 321 can be selectively connected between the first power battery 11 and the second controller 22 to form a current loop between the first power battery 11, the second controller 22, and the second coil element 321. Similarly, the second coil elements 321 can be selectively connected between the second power battery 12 and the second controller 22 to form a current loop between the second power battery 12, the second controller 22, and the second coil element 321.

[0079] Alternatively, the first coil 311 and the second coil 321 can be connected in a circuit formed by the charging port, the first power battery 11, the first controller 21, the second power battery 12, and the second controller 22.

[0080] In embodiments of this disclosure, the second controller 22 further includes six switching devices 25, wherein multiple switching devices 25 correspond one-to-one with the upper bridge arms 23 of multiple second inverter bridges 221, and multiple switching devices 25 correspond one-to-one with the lower bridge arms 24 of multiple second inverter bridges 221. Due to the switching characteristics of the switching devices 25 themselves, the bridge arm to which the switching device 25 is located will only be energized when the switching device 25 is turned on. In this way, each upper bridge arm 23 and each lower bridge arm 24 in the second inverter bridge 221 can be equipped with a switching device 25 to control its energization. When current flows into the second inverter bridge 221 of the second controller 22, each switching device 25 can be selectively turned on, so that at least one of the multiple second inverter bridges 221 is turned on. With this configuration, after the second controller 22 is energized, current flows through at least one of the multiple second coil elements 321.

[0081] In addition, by setting up multiple second inverter bridges 221 in this embodiment, and by setting up a switching device 25 on the upper and lower arms of each second inverter bridge 221 to control its conduction, it is possible not only to ensure that each arm of each second inverter bridge 221 can be independently controlled for power supply, but also to improve the power supply efficiency of the first controller 21.

[0082] In the embodiments of this disclosure, the plurality of first coil elements 311 are all inductors in the first drive motor 31, and the plurality of second coil elements 321 are all inductors in the second drive motor 32. At the moment of energization, both the first coil elements 311 and the second coil elements 321 impede the increase of current; this process is the charging process of the first coil elements 311 and the second coil elements 321, meaning that the first coil elements 311 and the second coil elements 321 can convert electrical energy into magnetic energy and store it. At the moment of de-energization, both the first coil elements 311 and the second coil elements 321 impede the disappearance of current; this process is the discharging process of the first coil elements 311 and the second coil elements 321, which can convert the stored magnetic energy into electrical energy and release it.

[0083] As shown in Figures 1 and 2, the power system 100 also includes a first capacitor 212, which is connected between the positive terminal of the first power battery 11 and the negative terminal of the second power battery 12, and is arranged in parallel with multiple first inverter bridges 211. Specifically, the first capacitor 212 has a voltage stabilizing function, which can simultaneously ensure the voltage stability across the first power battery 11, the second power battery 12, and the first inverter bridges 211, thereby ensuring the charging quality of the first power battery 11 and the second power battery 12 and preventing voltage surges to the charging port caused by the first power battery 11 and the second power battery 12 during charging and discharging.

[0084] Furthermore, the power system 100 also includes a second capacitor 222, which is connected between the positive terminal of the first power battery 11 and the negative terminal of the second power battery 12, and is arranged in parallel with multiple second inverter bridges 221. Specifically, the second capacitor 222 has a voltage stabilizing function, which can simultaneously ensure the voltage stability across the first power battery 11, the second power battery 12, and the second inverter bridge 221, thereby ensuring the charging quality of the first power battery 11 and the second power battery 12 and preventing voltage surges to the charging port caused by the first power battery 11 and the second power battery 12 during charging and discharging.

[0085] As shown in Figure 1, the power system 100 also includes a third capacitor 50, which is adapted to be connected between the positive and negative terminals of the charging port. Specifically, the third capacitor 50 is used to ensure the voltage stability across the second drive motor 32 and the second controller 22, and can prevent voltage changes across the second drive motor 32 and the second controller 22 from impacting the power supply device 200.

[0086] As shown in Figures 1 and 2, the power system 100 also includes a switch 60, which includes a first switch element 61 and a second switch element 62. One end of the first switch element 61 is connected to the positive terminal of the first power battery 11, and the other end of the first switch element 61 is connected to the first controller 21 and the second controller 22. The first switch element 61 is selectively opened and closed.

[0087] Specifically, the switches 60 in this embodiment of the present disclosure have two states: open and closed. When a switch 60 is in the open state, its circuit is disconnected; when a switch 60 is in the closed state, its circuit is connected.

[0088] The switch 60 of this embodiment includes a first switch element 61 and a second switch element 62. One end of the first switch element 61 is connected to the positive terminal of the first power battery 11, and the other end of the first switch element 61 is connected to the first controller 21 and the second controller 22. The first switch element 61 selectively opens and closes, so that the circuit between the positive terminal of the first power battery 11 and the first controller 21 can be selectively connected, and the circuit between the positive terminal of the first power battery 11 and the second controller 22 can be selectively connected.

[0089] One end of the second switch 62 is connected to the negative terminal of the second power battery 12, and the other end of the second switch 62 is connected to the first controller 21 and the second controller 22. The second switch 62 selectively opens and closes, so that the circuit between the negative terminal of the second power battery 12 and the first controller 21 can be selectively connected, and the circuit between the negative terminal of the second power battery 12 and the second controller 22 can be selectively connected.

[0090] As shown in Figures 1 and 2, the power system 100 also includes a resistor 40, and the switch 60 includes a ninth switch 69. The resistor 40 and the ninth switch 69 are connected in series, and then connected in parallel with the first switch 61. Specifically, the resistor 40 can ensure the circuit stability and reliability of the first power battery 11 and the second power battery 12 in a normal temperature environment.

[0091] Furthermore, both the first capacitor 212 and the second capacitor 222 are connected between the positive and negative terminals of the charging port. The ninth switch 69 is connected in parallel with the first switch 61. Thus, when the ninth switch 69 is closed and the first switch 61 is open, the positive terminals of the first power battery 11 and the second power battery 12 can be connected in parallel with the positive terminals of the first capacitor 212 and the second capacitor 222, and the negative terminals of the first power battery 11 and the second power battery 12 can be connected in parallel with the negative terminals of the first capacitor 212 and the second capacitor 222. With this configuration, the first power battery 11 and the second power battery 12 can simultaneously charge the first capacitor 212 and the second capacitor 222, forming a pre-charging circuit for the power system 100. During this process, the resistor 40 ensures the stability of the pre-charging circuit.

[0092] As shown in Figures 1 and 2, switch 60 includes a third switch element 63, a fourth switch element 64, a fifth switch element 65, and a sixth switch element 66. The third switch element 63 is adapted to be connected between the first controller 21 and the positive terminal of the charging port. The third switch element 63 selectively opens and closes, and the first controller 21 and the second controller 22 are connected in parallel. This allows for selective connection of the circuit between the power supply device 200 and the first controller 21, and selective connection of the circuit between the power supply device 200 and the second controller 22.

[0093] One end of the fourth switch 64 is connected to the second drive motor 32, and the other end is connected to the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12. The fourth switch 64 selectively opens and closes, so that the circuit between the second drive motor 32 and the first power battery 11 can be selectively connected, and the circuit between the second drive motor 32 and the second power battery 12 can be selectively connected.

[0094] The fifth switch 65 is adapted to be connected between the second controller 22 and the negative terminal of the charging port. The fifth switch 65 is selectively opened and closed, so that the circuit between the power supply device 200 and the second controller 22 can be selectively connected, and thus the circuit between the negative terminal of the charging port and the negative terminal of the second power battery 12 can be selectively connected.

[0095] The sixth switch 66 is adapted to be connected between the second drive motor 32 and the positive terminal of the charging port. The sixth switch 66 is selectively opened and closed, so that the circuit between the second drive motor 32 and the positive terminal of the charging port can be selectively connected.

[0096] As shown in Figures 1 and 2, switch 60 includes a seventh switch element 67 and an eighth switch element 68. The seventh switch element 67 is connected between the positive terminal of the first drive motor 31 and the first power battery 11. The seventh switch element 67 selectively opens and closes, so that the circuit between the first drive motor 31 and the first power battery 11 can be selectively connected.

[0097] One end of the eighth switch 68 is connected to the first drive motor 31, and the other end is connected between the negative terminal of the first power battery 11 and the positive terminal of the second power battery 12. The eighth switch 68 selectively opens and closes, so that the circuit between the first drive motor 31 and the negative terminal of the first power battery 11 can be selectively connected, and the circuit between the first drive motor 31 and the positive terminal of the second power battery 12 can be selectively connected.

[0098] According to embodiments of this disclosure, and in conjunction with Figures 3-20, the control method for the power system 100 is applicable to the power system 100 of this disclosure embodiment, and the power system 100 can be applied to a vehicle 300. The power system 100 has a first operating mode, a second operating mode, and a third operating mode.

[0099] Referring to Figure 16, the control method of the power system 100 includes the following steps:

[0100] S1. Obtain the vehicle's operating conditions;

[0101] S3. Control the power system to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery charges the second power battery, or the second power battery charges the first power battery.

[0102] Specifically, the control method of the power system 100 first acquires the vehicle's operating conditions in order to operate different working modes under the corresponding operating conditions.

[0103] When the power system 100 is operating in the first working mode, by controlling one of the first drive motor 31 and the second drive motor 32 to connect with one of the first power battery 11 and the second power battery 12, the first power battery 11 can charge the second power battery 12, or the second power battery 12 can charge the first power battery 11. In this way, the control method of the power system 100 can control the first power battery 11 and the second power battery 12 to charge each other, so that the current in the first power battery 11 and the second power battery 12 can flow bidirectionally.

[0104] This configuration allows the internal resistance of the first power battery 11 and the second power battery 12 to generate heat, thereby enabling the first power battery 11 and the second power battery 12 to self-heat. This allows the first power battery 11 and the second power battery 12 to regain activity in low-temperature environments, thus improving the vehicle's range.

[0105] As shown in Figure 16, the control method for the power system 100 further includes the following steps:

[0106] S4. Control the power system to operate in a second working mode according to the vehicle's operating conditions. In the second working mode, the external charging port charges the first power battery and the second power battery.

[0107] Specifically, when the power system 100 is operating in the second working mode, by selectively controlling one of the first drive motor 31 and the second drive motor 32 to connect between the first power battery 11 and the second power battery 12 and the charging port, it is possible to achieve buck charging or boost charging of the first power battery 11 and the second power battery 12.

[0108] This configuration allows the power system 100 in this embodiment to be adapted to power supply equipment of different specifications, thereby improving the charging safety and convenience of the vehicle.

[0109] As shown in Figures 3, 4, 16, and 17, step S3 further includes:

[0110] S3-1. First, control the first power battery to charge the first drive motor through the first controller;

[0111] S3-2, Then control the first drive motor to charge the second power battery through the first controller.

[0112] Specifically, when the first controller 21 is controlled to operate in the first working mode, the control method of the power system 100 first controls the first controller 21 to be turned on and controls the first power battery 11 to be connected to the first drive motor 31 so that the first power battery 11 supplies power to the first drive motor 31. The inductor in the first drive motor 31 can convert part of the electrical energy into a magnetic field. During this process, the current in the first power battery 11 flows from the positive terminal of the first power battery 11 to the negative terminal of the first power battery 11.

[0113] Then, the second power battery 12 is connected to the first drive motor 31, so that the magnetic field in the first drive motor 31 can be converted into electrical energy and supply power to the second power battery 12. During this process, the current in the second power battery 12 flows from the negative terminal to the positive terminal of the second power battery 12.

[0114] In the embodiments of this disclosure, the first power battery 11 charges the second power battery 12 via the first drive motor 31.

[0115] Referring to Figure 17, step S3-1 includes:

[0116] First, close the first switch 61 and the eighth switch 68, and open the second switch 62, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69, and control the first power battery 11 to charge the first drive motor 31 through the first controller 21;

[0117] Step S3-2 includes:

[0118] Then close the second switch 62 and the eighth switch 68, and open the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69, and control the first drive motor 31 to charge the second power battery 12 through the first controller 21.

[0119] Specifically, when the control method of the power system 100 controls the first power battery 11 to charge the first drive motor 31 through the first controller 21, the first switch 61 and the eighth switch 68 are closed first, and the second switch 62, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69 are opened.

[0120] After this step, the first controller 21 is turned on, and the positive terminal of the first power battery 11, the upper arm 23 of the first inverter bridge 211, the first coil 311, and the negative terminal of the first power battery 11 form a circuit. In this state, the first power battery 11 discharges to charge the first coil 311.

[0121] Then close the second switch 62 and the eighth switch 68, and open the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69.

[0122] After this step, the first controller 21 is turned on, and the negative terminal of the second power battery 12, the lower arm 24 of the first inverter bridge 211, the first coil 311, and the positive terminal of the second power battery 12 form a circuit. In this state, the first coil 311 discharges to charge the second power battery 12.

[0123] As shown in Figures 5, 6, 16, and 17, step S3 further includes:

[0124] S3-3, First, control the second power battery 12 to charge the first drive motor 31 through the first controller 21;

[0125] S3-4, The first drive motor 31 is then controlled to charge the first power battery 11 through the first controller 21.

[0126] Specifically, when the first controller 21 is controlled to operate in the first working mode, the control method of the power system 100 first controls the first controller 21 to be turned on and controls the second power battery 12 to be connected to the first drive motor 31 so that the second power battery 12 supplies power to the first drive motor 31. The inductor in the first drive motor 31 can convert part of the electrical energy into a magnetic field. During this process, the current in the second power battery 12 flows from the positive terminal of the second power battery 12 to the negative terminal of the second power battery 12.

[0127] Then, the first power battery 11 is connected to the first drive motor 31, so that the magnetic field in the first drive motor 31 can be converted into electrical energy and supply power to the first power battery 11. During this process, the current in the first power battery 11 flows from the negative terminal of the first power battery 11 to the positive terminal of the first power battery 11.

[0128] In the embodiments of this disclosure, the second power battery 12 charges the first power battery 11 through the first drive motor 31.

[0129] Referring to Figure 17, step S3-3 includes:

[0130] First, close the second switch 62 and the eighth switch 68, and open the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69, and control the second power battery 12 to charge the first drive motor 31 through the first controller 21;

[0131] Steps S3-4 include:

[0132] Then close the first switch 61 and the eighth switch 68, and open the second switch 62, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69, and control the first drive motor 31 to charge the first power battery 11 through the first controller 21.

[0133] Specifically, when the control method of the power system 100 controls the second power battery 12 to charge the first drive motor 31 through the first controller 21, the second switch 62 and the eighth switch 68 are closed first, and the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69 are opened.

[0134] After this step, the first controller 21 is turned on, and the positive terminal of the second power battery 12, the first coil 311, the lower bridge arm 24 of the first inverter bridge 211, and the negative terminal of the second power battery 12 form a circuit. In this state, the second power battery 12 discharges to charge the first coil 311.

[0135] Then close the first switch 61 and the eighth switch 68, and open the second switch 62, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67 and the ninth switch 69.

[0136] After this step, the first controller 21 is turned on, and the negative terminal of the first power battery 11, the first coil 311, the upper arm 23 of the first inverter bridge 211, and the positive terminal of the first power battery 11 form a circuit. In this state, the first coil 311 discharges to charge the first power battery 11.

[0137] During the operation steps S3-1 to S3-4 of the power system 100, the first power battery 11 and the second power battery 12 are both charged and discharged once. This is the process by which the power system 100 uses the first drive motor 31 to heat up the first power battery 11 and the second power battery 12.

[0138] For the first power battery 11, when the first power battery 11 is charging the first coil element 311, the first power battery 11 is in a discharging state; when the first coil element 311 is charging the first power battery 11, the first power battery 11 is in a charging state. In these two states, the current flowing inside the first power battery 11 is opposite. Due to the internal impedance of the first power battery 11, heat can be generated inside the first power battery 11. This heat can raise the temperature of the first power battery 11. Thus, in low-temperature environments, the ion activity in the first power battery 11 can be increased, thereby improving the battery's range and charge / discharge performance.

[0139] For the second power battery 12, when the second power battery 12 is charging the first coil 311, the second power battery 12 is in a discharging state; when the first coil 311 is charging the second power battery 12, the second power battery 12 is in a charging state. In these two states, the current flow inside the second power battery 12 is opposite. Due to the internal impedance of the second power battery 12, heat can be generated inside. This heat can raise the temperature of the second power battery 12. Thus, in low-temperature environments, the ion activity in the second power battery 12 can be increased, thereby improving the battery's range and charge / discharge performance.

[0140] As shown in Figures 7, 8, 16, and 18, step S3 further includes:

[0141] S3-5. First, control the first power battery 11 to charge the second drive motor 32 through the second controller 22;

[0142] S3-6, The second drive motor 32 is then controlled to charge the second power battery 12 through the second controller 22.

[0143] Specifically, when the second controller 22 is controlled to operate in the first working mode, the control method of the power system 100 first controls the second controller 22 to be turned on, and controls the first power battery 11 to be connected to the second drive motor 32, so that the first power battery 11 supplies power to the second drive motor 32. The inductor in the second drive motor 32 can convert part of the electrical energy into a magnetic field. During this process, the current in the first power battery 11 flows from the positive terminal of the first power battery 11 to the negative terminal of the first power battery 11.

[0144] Then, the second power battery 12 is connected to the second drive motor 32, so that the magnetic field in the second drive motor 32 can be converted into electrical energy and supply power to the second power battery 12. During this process, the current in the second power battery 12 flows from the negative terminal to the positive terminal of the second power battery 12.

[0145] In the embodiments of this disclosure, the first power battery 11 charges the second power battery 12 through the second drive motor 32.

[0146] Referring to Figure 18, step S3-5 includes:

[0147] First, close the first switch 61 and the fourth switch 64, and open the second switch 62, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the first power battery 11 to charge the second drive motor 32 through the second controller 22;

[0148] Steps S3-6 include:

[0149] Then close the second switch 62 and the fourth switch 64, and open the first switch 61, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the second drive motor 32 to charge the second power battery 12 through the second controller 22.

[0150] Specifically, when the control method of the power system 100 controls the first power battery 11 to charge the second drive motor 32 through the second controller 22, the first switch 61 and the fourth switch 64 are closed first, and the second switch 62, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69 are opened.

[0151] After this step, the second controller 22 is turned on, and a circuit is formed between the positive terminal of the first power battery 11, the upper arm 23 of the second inverter bridge 221, the second coil 321, and the negative terminal of the first power battery 11. In this state, the first power battery 11 discharges to charge the second coil 321.

[0152] Then close the second switch 62 and the fourth switch 64, and open the first switch 61, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69.

[0153] After this step, the second controller 22 is turned on, and the negative terminal of the second power battery 12, the lower arm 24 of the second inverter bridge 221, the second coil 321, and the positive terminal of the second power battery 12 form a circuit. In this state, the second coil 321 discharges to charge the second power battery 12.

[0154] Referring to Figures 9, 10, 16, and 18, step S3 further includes:

[0155] S3-7. First, control the second power battery 12 to charge the second drive motor 32 through the second controller 22;

[0156] S3-8, then control the second drive motor 32 to charge the first power battery 11 through the second controller 22.

[0157] Specifically, when the second controller 22 is controlled to operate in the first working mode, the control method of the power system 100 first controls the second controller 22 to be turned on, and controls the second power battery 12 to be connected to the second drive motor 32, so that the second power battery 12 supplies power to the second drive motor 32. The inductor in the second drive motor 32 can convert part of the electrical energy into a magnetic field. During this process, the current in the second power battery 12 flows from the positive terminal of the second power battery 12 to the negative terminal of the second power battery 12.

[0158] Then, the first power battery 11 is connected to the second drive motor 32, so that the magnetic field in the second drive motor 32 can be converted into electrical energy and supply power to the first power battery 11. During this process, the current in the first power battery 11 flows from the negative terminal to the positive terminal of the first power battery 11.

[0159] In the embodiments of this disclosure, the second power battery 12 charges the first power battery 11 through the second drive motor 32.

[0160] Referring to Figure 18, step S3-7 includes:

[0161] First, close the second switch 62 and the fourth switch 64, and open the first switch 61, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the second power battery 12 to charge the second drive motor 32 through the second controller 22;

[0162] Steps S3-8 include:

[0163] Then close the first switch 61 and the fourth switch 64, and open the second switch 62, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the second drive motor 32 to charge the first power battery 11 through the second controller 22.

[0164] Specifically, when the control method of the power system 100 controls the second power battery 12 to supply power to the second drive motor 32, it first closes the second switch 62 and the fourth switch 64, and then opens the first switch 61, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69.

[0165] After this step, the second controller 22 is turned on, and the positive terminal of the second power battery 12, the second coil 321, the lower arm 24 of the second inverter bridge 221, and the negative terminal of the second power battery 12 form a circuit. In this state, the second power battery 12 discharges to charge the second coil 321.

[0166] Then close the first switch 61 and the fourth switch 64, and open the second switch 62, the third switch 63, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69.

[0167] After this step, the second controller 22 is turned on, and the negative terminal of the first power battery 11, the second coil 321, the upper arm 23 of the second inverter bridge 221, and the positive terminal of the first power battery 11 form a circuit. In this state, the second coil 321 discharges to charge the first power battery 11.

[0168] During the operation of the power system 100 in steps S3-5 to S3-8, the first power battery 11 and the second power battery 12 are both charged and discharged once. This is the process by which the power system 100 heats up the first power battery 11 and the second power battery 12 through the second drive motor 32.

[0169] For the first power battery 11, when the second coil element 321 charges the first power battery 11, the first power battery 11 is in a discharging state; when the second coil element 321 charges the first power battery 11, the first power battery 11 is in a charging state. In these two states of charging and discharging, the internal current of the first power battery 11 flows in opposite directions. Due to the internal impedance of the first power battery 11, heat can be generated inside the first power battery 11. This heat can raise the temperature of the first power battery 11. Thus, in low-temperature environments, the ion activity in the first power battery 11 can be increased, thereby improving the battery's range and charging / discharging performance.

[0170] For the second power battery 12, when the second power battery 12 is charging the second coil element 321, the second power battery 12 is in a discharging state; when the second coil element 321 is charging the second power battery 12, the second power battery 12 is in a charging state. In these two states, the current flow inside the second power battery 12 is opposite. Due to the internal impedance of the second power battery 12, heat can be generated inside the second power battery 12. This heat can raise the temperature of the second power battery 12. Thus, in low-temperature environments, the ion activity in the second power battery 12 can be increased, thereby improving the battery's range and charge / discharge performance.

[0171] As shown in Figures 11, 12, 16, and 19, step S4 further includes:

[0172] S4-1. First, control the power supply device 200 to charge the first drive motor 31 through the first controller 21;

[0173] S4-2, Then control the first drive motor 31 to charge the first power battery 11 and the second power battery 12 through the first controller 21.

[0174] Specifically, when the first controller 21 is controlled to run in the second working mode, the control method of the power system 100 controls the first controller 21 to be turned on, and controls the first drive motor 31, the first power battery 11 and the second power battery 12 to be connected between the positive and negative terminals of the charging port. This allows the power supply device 200 to charge the first power battery 11 and the second power battery 12 through the first drive motor 31.

[0175] Then, the first drive motor 31 is disconnected from the positive and negative terminals of the charging port so that the first drive motor 31 discharges and charges the first power battery 11 and the second power battery 12. Through the adjustment of the first controller 21, the charging voltage at both ends of the first power battery 11 and the second power battery 12 can be reduced.

[0176] In the embodiments of this disclosure, the first power battery 11 and the second power battery 12 can be charged by step-down charging through the first drive motor 31.

[0177] Referring to Figure 19, step S4-1 includes:

[0178] First, close the second switch 62, the third switch 63, the fifth switch 65 and the seventh switch 67, and open the first switch 61, the fourth switch 64, the sixth switch 66, the eighth switch 68 and the ninth switch 69, and control the charging port to charge the first drive motor 31 through the first controller 21;

[0179] Step S4-2 includes:

[0180] Then close the second switch 62 and the seventh switch 67, and open the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the eighth switch 68 and the ninth switch 69, and control the first drive motor 31 to charge the first power battery 11 and the second power battery 12 through the first controller 21.

[0181] Specifically, when the power supply device 200 charges the first drive motor 31 through the first controller 21, the control method of the power system 100 first closes the second switch 62, the third switch 63, the fifth switch 65 and the seventh switch 67, and then opens the first switch 61, the fourth switch 64, the sixth switch 66, the eighth switch 68 and the ninth switch 69.

[0182] After this step, the first controller 21 is turned on, forming a circuit between the positive terminal of the charging port, the upper arm 23 of the first inverter bridge 211, the first coil 311, the positive terminal of the first power battery 11, the negative terminal of the first power battery 11, the positive terminal of the second power battery 12, the negative terminal of the second power battery 12, and the negative terminal of the charging port. In this state, the charging port charges the first coil 311, and the first coil 311 charges the first power battery 11 and the second power battery 12.

[0183] Then close the second switch 62 and the seventh switch 67, and open the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the eighth switch 68 and the ninth switch 69.

[0184] After this step, the first controller 21 is turned on, and the lower bridge arm 24 of the first inverter bridge 211, the first coil 311, the positive terminal of the first power battery 11, the negative terminal of the first power battery 11, the positive terminal of the second power battery 12, and the negative terminal of the second power battery 12 form a circuit. In this state, the first coil 311 discharges to charge the first power battery 11 and the second power battery 12.

[0185] The operation steps S4-1 and S4-2 of the power system 100 are the process of the power system 100 charging the first power battery 11 and the second power battery 12 by stepping down the voltage through the first drive motor 31.

[0186] As shown in Figures 13, 14, 16, and 20, step S4 further includes:

[0187] S4-3. First, control the power supply device 200 to charge the second drive motor 32 through the second controller 22;

[0188] S4-4, the re-control power supply device 200 and the second drive motor 32 charge the first power battery 11 and the second power battery 12 through the second controller 22.

[0189] Specifically, when the second controller 22 is operated in the second working mode, the control method of the power system 100 controls the second controller 22 to be turned on and controls the second drive motor 32 to be connected between the positive and negative terminals of the charging port, so that the power supply device 200 can charge the second drive motor 32.

[0190] Then, the two ends of the second drive motor 32 are connected to the positive terminal of the first power battery 11 and the negative terminal of the second power battery 12 respectively, so that the charging port of the power supply device 200 charges the first power battery 11 and the second power battery 12 together through the second drive motor 32. By adjusting the second controller 22, the charging voltage at both ends of the first power battery 11 and the second power battery 12 can be increased.

[0191] In the embodiments of this disclosure, the first power battery 11 and the second power battery 12 can be boosted and charged by the second drive motor 32.

[0192] Referring to Figure 20, step S4-3 includes:

[0193] Close the fifth switch 65 and the sixth switch 66, and open the first switch 61, the second switch 62, the third switch 63, the fourth switch 64, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the charging port to charge the second drive motor 32 through the second controller 22;

[0194] Step S4-4 includes:

[0195] Then close the first switch 61, the second switch 62, the fifth switch 65 and the sixth switch 66, and open the third switch 63, the seventh switch 67, the eighth switch 68 and the ninth switch 69, and control the power supply device 200 and the second drive motor 32 to charge the first power battery 11 and the second power battery 12 through the second controller 22.

[0196] Specifically, when the power supply device 200 charges the second drive motor 32 through the second controller 22, the control method of the power system 100 first closes the fifth switch 65 and the sixth switch 66, and then opens the first switch 61, the second switch 62, the third switch 63, the fourth switch 64, the seventh switch 67, the eighth switch 68 and the ninth switch 69.

[0197] After this step, the second controller 22 is turned on, and a circuit is formed between the positive terminal of the charging port, the second coil 321, the lower bridge arm 24 of the second inverter bridge 221, and the negative terminal of the charging port. In this state, the charging port charges the second coil 321.

[0198] Then close the first switch 61, the second switch 62, the fifth switch 65 and the sixth switch 66, and open the third switch 63, the seventh switch 67, the eighth switch 68 and the ninth switch 69.

[0199] After this step, the second controller 22 is turned on, forming a circuit between the positive terminal of the charging port, the second coil 321, the upper arm 23 of the second inverter bridge 221, the positive terminal of the first power battery 11, the negative terminal of the first power battery 11, the positive terminal of the second power battery 12, the negative terminal of the second power battery 12, and the negative terminal of the charging port. In this state, the charging port charges the first power battery 11 and the second power battery 12 through the second coil 321.

[0200] The operation steps S4-3 and S4-4 of the power system 100 are the process of the power system 100 boosting and charging the first power battery 11 and the second power battery 12 through the power supply device 200 and the second drive motor 32.

[0201] According to embodiments of this disclosure, in steps S4-1 and S4-2, the power system 100 can perform step-down charging of the first power battery 11 and the second power battery 12 via the first drive motor 31. In steps S4-3 and S4-4, the power system 100 can perform step-up charging of the first power battery 11 and the second power battery 12 via the second drive motor 32. Therefore, the power system 100 of this disclosure can be connected to the charging ports of power supply devices 200 of different specifications and models, enabling the first power battery 11 and the second power battery 12 to achieve ideal charging efficiency and ensuring normal charging of the first power battery 11 and the second power battery 12.

[0202] In embodiments of this disclosure, buck charging and boost charging of the power system 100 can operate simultaneously.

[0203] As shown in Figures 15 and 16, the control method for the power system 100 further includes the following steps:

[0204] S2. Control the power system 100 to operate in the third working mode, wherein, in the third working mode, the power battery 10 charges the first capacitor 212 and the second capacitor 222.

[0205] Step S2 includes:

[0206] When the ninth switch 69 and the second switch 62 are closed, and the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69 are disconnected, the power battery 10 charges the first capacitor 212 and the second capacitor 222.

[0207] Specifically, when the power system 100 operates in the third working mode, the ninth switch 69 and the second switch 62 are closed first, and the first switch 61, the third switch 63, the fourth switch 64, the fifth switch 65, the sixth switch 66, the seventh switch 67, the eighth switch 68 and the ninth switch 69 are disconnected.

[0208] After this step, both the first controller 21 and the second controller 22 are de-energized, and a circuit is formed between the positive and negative terminals of the first power battery 11, the positive and negative terminals of the second power battery 12, the first capacitor 212, and the second capacitor 222. In this state, the first power battery 11 and the second power battery 12 charge the first capacitor 212 and the second capacitor 222.

[0209] The process of operating step S2 of the power system 100 is the process of the power system 100 precharging the first capacitor 212 and the second capacitor 222 through the first power battery 11 and the second power battery 12.

[0210] According to an embodiment of this disclosure, and in conjunction with FIG16, the control method of the power system 100 controls the power system 100 to first operate in a third operating mode, and then operate in a first operating mode or a second operating mode. This configuration ensures that the first capacitor 212 and the second capacitor 222 maintain voltage stability of the first power battery 11 and the second power battery 12 in both the first and second operating modes of the power system 100, thereby guaranteeing the charging quality of the first power battery 11 and the second power battery 12. This prevents voltage surges to the external charging port by the power system 100 under all operating conditions, thus ensuring the safety and reliability of the charging and self-heating of the power system 100.

[0211] According to embodiments of this disclosure, the power system 100 also has a fourth operating mode. After the power system 100 operates step S2, the control method of the power system 100 can control the power system 100 to operate in the fourth operating mode. In the fourth operating mode, the first switch 61, the second switch 62, the third switch 63, the fifth switch 65, and the ninth switch 69 are first closed, and the fourth switch 64, the sixth switch 66, and the eighth switch 68 are opened. In this state, the positive terminal of the charging port, the positive terminal of the first power battery 11, the negative terminal of the first power battery 11, the positive terminal of the second power battery 12, the negative terminal of the second power battery 12, and the negative terminal of the charging port form a circuit, so that the power supply device 200 can directly supply power to the first power battery 11 and the second power battery 12, so that the first power battery 11 and the second power battery 12 can be charged normally at room temperature.

[0212] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0213] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A power system (100), comprising: The power battery (10) includes a first power battery (11) and a second power battery (12). The negative terminal of the first power battery (11) is connected to the positive terminal of the second power battery (12), and the negative terminal of the second power battery (12) is adapted to be connected to the negative terminal of the charging port. The controller (20) includes a first controller (21) and a second controller (22), the first controller (21) and the second controller (22) being selectively connected between the positive terminal of the first power battery (11) and the negative terminal of the second power battery (12), the first controller (21) being adapted to be connected between the positive terminal of the charging port and the negative terminal of the charging port, and the second controller (22) being adapted to be connected between the positive terminal of the charging port and the negative terminal of the charging port; as well as The drive motor (30) includes a first drive motor (31) and a second drive motor (32). One end of the first drive motor (31) is connected to the first controller (21), and the other end is selectively connected to the positive terminal of the first power battery (11), or selectively connected between the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12). One end of the second drive motor (32) is connected to the second controller (22), and the other end is selectively connected between the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12), or is adapted to be connected to the positive terminal of the charging port.

2. The power system (100) according to claim 1, characterized in that, The first controller (21) includes a plurality of first inverter bridges (211), and the second controller (22) includes a plurality of second inverter bridges (221). Each first inverter bridge (211) and each second inverter bridge (221) includes an upper bridge arm (23) and a lower bridge arm (24) connected to each other. The first drive motor (31) includes a plurality of first coil elements (311), each of which corresponds to a plurality of first inverter bridges (211). One end of the first coil element (311) is electrically connected to the upper bridge arm (23) and the lower bridge arm (24) of the first inverter bridge (211). The other end of the first coil element (311) is selectively connected to the positive terminal of the first power battery (11), or selectively connected to the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12). The second drive motor (32) includes a plurality of second coil elements (321), each of which corresponds to a plurality of second inverter bridges (221). One end of the second coil element (321) is electrically connected to the upper bridge arm (23) and the lower bridge arm (24) of the second inverter bridge (221). The other end of the second coil element (321) is selectively connected to the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12), or is adapted to be connected to the positive terminal of the charging port.

3. The power system (100) according to claim 2, characterized in that, The power system (100) further includes a first capacitor (212), which is connected between the positive terminal of the first power battery (11) and the negative terminal of the second power battery (12) and is arranged in parallel with a plurality of first inverter bridges (211); The power system (100) further includes a second capacitor (222), which is connected between the positive terminal of the first power battery (11) and the negative terminal of the second power battery (12) and is arranged in parallel with a plurality of second inverter bridges (221).

4. The power system (100) according to claim 2 or 3, characterized in that, The power system (100) further includes a third capacitor (50) adapted to be connected between the positive terminal and the negative terminal of the charging port.

5. The power system (100) according to any one of claims 2-4, characterized in that, It also includes a switch (60), which includes a first switch element (61) and a second switch element (62). One end of the first switch element (61) is connected to the positive terminal of the first power battery (11), and the other end of the first switch element (61) is connected to the first controller (21) and the second controller (22). The first switch element (61) is selectively opened and closed. One end of the second switch (62) is connected to the negative terminal of the second power battery (12), and the other end of the second switch (62) is connected to the first controller (21) and the second controller (22). The second switch (62) is selectively opened and closed.

6. The power system (100) according to claim 5, characterized in that, The power system also includes a resistor (40), and the switch (60) also includes a ninth switch (69). The resistor (40) and the ninth switch (69) are connected in series and then connected in parallel with the first switch (61). The ninth switch (69) is selectively opened and closed.

7. The power system (100) according to claim 5 or 6, characterized in that, The switch (60) includes a third switch (63), a fourth switch (64), a fifth switch (65) and a sixth switch (66). The third switch (63) is adapted to be connected between the first controller (21) and the positive terminal of the charging port. The third switch (63) is selectively opened and closed. One end of the fourth switch (64) is connected to the second drive motor (32), and the other end is connected between the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12). The fourth switch (64) is selectively opened and closed. The fifth switch (65) is adapted to be connected between the second controller (22) and the negative terminal of the charging port, and the fifth switch (65) selectively opens and closes; The sixth switch (66) is adapted to be connected between the second drive motor (32) and the positive terminal of the charging port, and the sixth switch (66) is selectively opened and closed.

8. The power system (100) according to any one of claims 5-7, characterized in that, The switch (60) includes a seventh switch (67) and an eighth switch (68). The seventh switch (67) is connected between the first drive motor (31) and the positive terminal of the first power battery (11). The seventh switch (67) is selectively opened and closed. One end of the eighth switch (68) is connected to the first drive motor (31), and the other end is connected between the negative terminal of the first power battery (11) and the positive terminal of the second power battery (12). The eighth switch (68) is selectively opened and closed.

9. A control method for a dynamic system, characterized in that, Includes the following steps: Obtain the vehicle's operating status; and According to the vehicle's operating conditions, the power system (100) is controlled to operate in a first working mode, wherein, in the first working mode, the first power battery (11) charges the second power battery (12), or the second power battery (12) charges the first power battery (11). The control method of the power system (100) is applicable to the power system (100) according to any one of claims 1-8.

10. The control method for a power system according to claim 9, characterized in that, It also includes the following steps: The power system (100) is controlled to operate in a second working mode according to the vehicle's operating conditions, wherein, in the second working mode, the external charging port charges the first power battery (11) and the second power battery (12).

11. The control method for a power system according to claim 9 or 10, characterized in that, The step of controlling the power system (100) to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery (11) charges the second power battery (12), or the second power battery (12) charges the first power battery (11), includes: First, control the first power battery (11) to charge the first drive motor (31) through the first controller (21); Then, the first drive motor (31) is controlled to charge the second power battery (12) through the first controller (21).

12. The control method for a power system according to claim 11, characterized in that, The step of first controlling the first power battery (11) to charge the first drive motor (31) through the first controller (21), and then controlling the first drive motor (31) to charge the second power battery (12) through the first controller (21) includes: First, close the first switch (61) and the eighth switch (68), and open the second switch (62), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the seventh switch (67) and the ninth switch (69), and control the first power battery (11) to charge the first drive motor (31) through the first controller (21); Then close the second switch (62) and the eighth switch (68), and disconnect the first switch (61), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the seventh switch (67) and the ninth switch (69), and control the first drive motor (31) to charge the second power battery (12) through the first controller (21).

13. The control method for a power system according to claim 9 or 10, characterized in that, The step of controlling the power system (100) to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery (11) charges the second power battery (12), or the second power battery (12) charges the first power battery (11), includes: First, control the second power battery (12) to charge the first drive motor (31) through the first controller (21); Then, the first drive motor (31) is controlled to charge the first power battery (11) through the first controller (21).

14. The control method for a power system according to claim 13, characterized in that, The step of first controlling the second power battery (12) to charge the first drive motor (31) through the first controller (21), and then controlling the first drive motor (31) to charge the first power battery (11) through the first controller (21) includes: First, close the second switch (62) and the eighth switch (68), and open the first switch (61), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the seventh switch (67) and the ninth switch (69), and control the second power battery (12) to charge the first drive motor (31) through the first controller (21); Then close the first switch (61) and the eighth switch (68), and disconnect the second switch (62), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the seventh switch (67) and the ninth switch (69), and control the first drive motor (31) to charge the first power battery (11) through the first controller (21).

15. The control method for a power system according to any one of claims 9-14, characterized in that, The step of controlling the power system (100) to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery (11) charges the second power battery (12), or the second power battery (12) charges the first power battery (11), includes: First, control the first power battery (11) to charge the second drive motor (32) through the second controller (22); Then, the second drive motor (32) is controlled to charge the second power battery (12) through the second controller (22).

16. The control method for a power system according to claim 15, characterized in that, The step of first controlling the first power battery (11) to charge the second drive motor (32) through the second controller (22), and then controlling the second drive motor (32) to charge the second power battery (12) through the second controller (22) includes: First, close the first switch (61) and the fourth switch (64), and open the second switch (62), the third switch (63), the fifth switch (65), the sixth switch (66), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the first power battery (11) to charge the second drive motor (32) through the second controller (22); Then close the second switch (62) and the fourth switch (64), and disconnect the first switch (61), the third switch (63), the fifth switch (65), the sixth switch (66), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the second drive motor (32) to charge the second power battery (12) through the second controller (22).

17. The control method for a power system according to any one of claims 9-16, characterized in that, The step of controlling the power system (100) to operate in a first working mode according to the vehicle's operating conditions, wherein in the first working mode, the first power battery (11) charges the second power battery (12), or the second power battery (12) charges the first power battery (11), includes: First, control the second power battery (12) to charge the second drive motor (32) through the second controller (22); Then, the second drive motor (32) is controlled to charge the first power battery (11) through the second controller (22).

18. The control method for a power system according to claim 17, characterized in that, The step of first controlling the second power battery (12) to charge the second drive motor (32) through the second controller (22), and then controlling the second drive motor (32) to charge the first power battery (11) through the second controller (22) includes: First, close the second switch (62) and the fourth switch (64), and open the first switch (61), the third switch (63), the fifth switch (65), the sixth switch (66), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the second power battery (12) to charge the second drive motor (32) through the second controller (22); Then close the first switch (61) and the fourth switch (64), and disconnect the second switch (62), the third switch (63), the fifth switch (65), the sixth switch (66), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the second drive motor (32) to charge the first power battery (11) through the second controller (22).

19. The control method for a power system according to claim 10, characterized in that, The method of controlling the power system (100) to operate in a second working mode according to the vehicle's operating conditions, wherein, in the second working mode, the external charging port charges the first power battery (11) and the second power battery (12), including: First, the power supply device (200) is controlled to charge the first drive motor (31) through the first controller (21); Then, the first drive motor (31) is controlled to charge the first power battery (11) and the second power battery (12) through the first controller (21).

20. The control method for a power system according to claim 19, characterized in that, The first step of controlling the power supply device (200) to charge the first drive motor (31) through the first controller (21), and then controlling the first drive motor (31) to charge the first power battery (11) and the second power battery (12) through the first controller (21), includes: First, close the second switch (62), the third switch (63), the fifth switch (65) and the seventh switch (67), and open the first switch (61), the fourth switch (64), the sixth switch (66), the eighth switch (68) and the ninth switch (69), and control the power supply device (200) to charge the first drive motor (31) through the first controller (21); Then close the second switch (62) and the seventh switch (67), and disconnect the first switch (61), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the eighth switch (68) and the ninth switch (69), and control the first drive motor (31) to charge the first power battery (11) and the second power battery (12) through the first controller (21).

21. The control method for a power system according to claim 10, characterized in that, The method of controlling the power system (100) to operate in a second working mode according to the vehicle's operating conditions, wherein, in the second working mode, the external charging port charges the first power battery (11) and the second power battery (12), including: First, the power supply device (200) is controlled to charge the second drive motor (32) through the second controller (22); The power supply device (200) and the second drive motor (32) are then controlled to charge the first power battery (11) and the second power battery (12) through the second controller (22).

22. The control method for a power system according to claim 21, characterized in that, The first step of controlling the power supply device (200) to charge the second drive motor (32) through the second controller (22), and then controlling the power supply device (200) and the second drive motor (32) to charge the first power battery (11) and the second power battery (12) through the second controller (22), includes: First, close the fifth switch (65) and the sixth switch (66), and open the first switch (61), the second switch (62), the third switch (63), the fourth switch (64), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the power supply device (200) to charge the second drive motor (32) through the second controller (22); Then close the first switch (61), the second switch (62), the fifth switch (65) and the sixth switch (66), and open the third switch (63), the seventh switch (67), the eighth switch (68) and the ninth switch (69), and control the power supply device (200) and the second drive motor (32) to charge the first power battery (11) and the second power battery (12) through the second controller (22).

23. The control method for a power system according to any one of claims 9-22, characterized in that, It also includes the following steps: The power system (100) is controlled to operate in a third working mode, wherein the power battery (10) charges the first capacitor (212) and the second capacitor (222).

24. The control method for a power system according to claim 23, characterized in that, The control system (100) is set to operate in a third working mode, wherein, in the third working mode, the power battery (10) charges the first capacitor (212) and the second capacitor (222), including: When the ninth switch (69) and the second switch (62) are closed, and the first switch (61), the third switch (63), the fourth switch (64), the fifth switch (65), the sixth switch (66), the seventh switch (67), the eighth switch (68), and the ninth switch (69) are disconnected, the power battery (10) charges the first capacitor (212) and the second capacitor (222).

25. The control method for a power system according to any one of claims 9-24, characterized in that, Control the power system (100) to first run the third working mode, and then run the first working mode or the second working mode.

26. A vehicle (300), characterized in that, include: The power system (100) according to any one of claims 1-8.

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