Battery pack control system and method for electric vehicle, electric vehicle

Abstract

The present invention relates to the field of battery control technology, and specifically discloses a battery pack control system and method for an electric vehicle, and an electric vehicle, wherein the electric vehicle includes a first motor control circuit, a second motor control circuit and a third motor control circuit, and the control system includes: a switch module, which is used to connect the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, and is suitable for controlling the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and the external power supply device, so that the battery pack can operate in one or two working modes of self-heating mode, direct charging mode and buck charging mode. The present invention provides a battery pack with multiple charging modes by using a combined motor control circuit, which can improve the environmental adaptability of the electric vehicle, while reducing the design cost of the electric vehicle, and can also ensure the charging efficiency of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery control technology, and in particular to a battery pack control system and method for an electric vehicle, and an electric vehicle. Background Art

[0002] New energy vehicles are becoming more and more popular in the automotive field, but the charging and discharging performance of batteries widely used in the field of new energy vehicles is affected by the external temperature. Especially in low temperature environments, the ion activity in the battery pack is very low, making the battery pack unable to provide energy for the vehicle normally.

[0003] The technical solution adopted in the related art is to set up auxiliary heating equipment to heat the battery pack, but the related technology requires additional equipment, increases the vehicle design cost, and even requires rewiring, and also cannot guarantee the charging efficiency of the battery pack. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first object of the present invention is to provide a battery pack control system for an electric vehicle, which can improve the environmental adaptability of the electric vehicle, reduce the design cost of the electric vehicle, and ensure the charging efficiency of the battery pack by providing multiple charging modes to the battery pack through the use of a motor control circuit.

[0005] A second objective of the present invention is to provide an electric vehicle.

[0006] The third object of the present invention is to provide a battery pack control method for an electric vehicle.

[0007] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a battery pack control system for an electric vehicle, wherein the electric vehicle includes a first motor control circuit, a second motor control circuit and a third motor control circuit, and the control system includes: a switch module, wherein the switch module is respectively connected between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, and is suitable for controlling the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and the external power supply device, so that the battery pack operates in one or two working modes among self-heating mode, direct charging mode and buck charging mode.

[0008] In the battery pack control system of the electric vehicle in the embodiment of the present invention, the control system can multiplex the first motor control circuit, the second motor control circuit and the third motor control circuit through the switch module, thereby completing the control of the self-heating, direct charging and step-down charging modes of the battery pack, thereby improving the environmental adaptability of the electric vehicle and reducing the design cost of the electric vehicle. In addition, through the step-down control of the motor control circuit, the charging efficiency of the battery pack can also be guaranteed.

[0009] To achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes an electric vehicle, which includes a controller and a battery pack control system of the electric vehicle described in any one of the above-mentioned embodiments, wherein the controller is connected to a switch module and is used to configure the switch state of the switch module, the first motor control circuit, the second motor control circuit and the third motor control circuit to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, so that the battery pack operates in one or two working modes among self-heating mode, direct charging mode and buck charging mode.

[0010] The electric vehicle of the embodiment of the present invention can improve the environmental adaptability of the electric vehicle through the battery pack control system of the electric vehicle in the above embodiment, while reducing the design cost of the electric vehicle and ensuring the charging efficiency of the battery pack.

[0011] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes a battery pack control method for an electric vehicle, which is applied to the electric vehicle of the above-mentioned embodiment, and the control method includes the following steps: responding to a battery pack control instruction; configuring the switching state of the switch module, the first motor control circuit, the second motor control circuit and the third motor control circuit according to the control instruction to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, so that the battery pack operates in one or two working modes among self-heating mode, direct charging mode and buck charging mode.

[0012] In the battery pack control method of an electric vehicle in an embodiment of the present invention, a response is first made to a battery pack control instruction, and then the switch state of the switch module, the first motor control circuit, the second motor control circuit and the third motor control circuit are configured according to the control instruction, so that the first motor control circuit, the second motor control circuit and the third motor control circuit can be multiplexed through the switch module to complete the control of the self-heating, direct charging and step-down charging modes of the battery pack, thereby improving the environmental adaptability of the electric vehicle and reducing the design cost of the electric vehicle. In addition, the charging efficiency of the battery pack can be guaranteed through the step-down control of the motor control circuit.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a circuit diagram of a battery pack control system for an electric vehicle in one embodiment of the present invention;

[0015] Figure 2 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0016] Figure 3 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0017] Figure 4 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0018] Figure 5 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0019] Figure 6 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0020] Figure 7 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0021] Figure 8 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0022] Fig. 9 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0023] Fig.10is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0024] Fig.11 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0025] Fig.12 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0026] Fig.13 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0027] Fig.14 is a circuit diagram of a battery pack control system for an electric vehicle in another embodiment of the present invention;

[0028] Fig.15 is a structural block diagram of an electric vehicle in an embodiment of the present invention;

[0029] Fig.16 It is a flow chart of the battery pack control method of an electric vehicle in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following describes a battery pack control system and method for an electric vehicle and an electric vehicle according to embodiments of the present invention with reference to the accompanying drawings.

[0032] An electric vehicle generally includes multiple motors, and each motor includes a corresponding control circuit. The present invention reuses the motor control circuits corresponding to the three motors in the electric vehicle to achieve control of the battery pack. Figure 1The battery pack control system of the electric vehicle of the present invention reuses the first motor control circuit 11, the second motor control circuit 12 and the third motor control circuit 13. The control system also includes a switch module, which is respectively connected between the battery pack, the first motor control circuit 11, the second motor control circuit 12, the third motor control circuit 13 and the external power supply device, and the switch module is composed of a plurality of switches. Since the switches are distributed in different positions in the system, the switch module is not marked in the figure, and each switch is specifically marked. The switch module is suitable for adjusting the energy transfer direction between the battery pack, the first motor control circuit 11, the second motor control circuit 12, the third motor control circuit 13 and the external power supply device, so that the battery pack can work in a self-heating mode, a direct charging mode or a step-down charging mode, so that the battery pack can be heated and charged using an external power supply device, so that the battery pack can be used normally in a low temperature environment, and the adaptability of the electric vehicle to the environment is improved.

[0033] See also Figure 1 The motor control circuit is described in detail, wherein the first motor control circuit 11, the second motor control circuit 12 and the third motor control circuit 13 each include at least one phase sub-circuit. The motor control circuit of the present invention can be described by a three-phase sub-circuit, which can be specifically extended to single-phase, five-phase, six-phase, etc. Each phase sub-circuit includes an upper bridge switch tube, a lower bridge switch tube and a phase inductor. The upper bridge switch tube and the lower bridge switch tube are connected in series between the positive terminal and the negative terminal of the DC bus. The node between the upper bridge switch tube and the lower bridge switch tube is connected to one end of the phase inductor. The other end of the phase inductor in each phase sub-circuit in the first motor control circuit 11 is connected and has a first node P1. The other end of the phase inductor in each phase sub-circuit in the second motor control circuit 12 is connected and has a second node P2. The other end of the phase inductor in each phase sub-circuit in the third motor control circuit 13 is connected and has a third node P3.

[0034] Each phase sub-circuit in the three-phase sub-circuit in the first motor control circuit 11 includes an upper bridge switch tube, a lower bridge switch tube and a phase inductor. Specifically, the first phase sub-circuit in the three-phase sub-circuit includes a first switch tube VT1 and a second switch tube VT2, and a first phase inductor L11 is also connected to the connection node between the first switch tube VT1 and the second switch tube VT2. The second phase sub-circuit includes a third switch tube VT3 and a fourth switch tube VT4, and a second phase inductor L12 is also connected to the connection node between the third switch tube VT3 and the fourth switch tube VT4. The third phase sub-circuit includes a fifth switch tube VT5 and a sixth switch tube VT6, and a third phase inductor L13 is also connected to the connection node between the fifth switch tube VT5 and the sixth switch tube VT6. Each phase sub-circuit in the three-phase sub-circuit in the second motor control circuit 12 also includes an upper bridge switch tube, a lower bridge switch tube and a phase inductor. Specifically, the first phase sub-circuit in the three-phase sub-circuit includes a seventh switch tube VT7 and an eighth switch tube VT8, and a fourth phase inductor L21 is also connected to the connection node between the seventh switch tube VT7 and the eighth switch tube VT8. The second phase sub-circuit includes a ninth switch tube VT9 and a tenth switch tube VT10, and a fifth phase inductor L22 is also connected to the connection node between the ninth switch tube VT9 and the tenth switch tube VT10. The third phase sub-circuit includes an eleventh switch tube VT11 and a twelfth switch tube VT12, and a sixth phase inductor L23 is also connected to the connection node between the eleventh switch tube VT11 and the twelfth switch tube VT12. Each phase sub-circuit in the three-phase sub-circuit in the third motor control circuit 13 includes an upper bridge switch tube, a lower bridge switch tube and a phase inductor. Specifically, the first phase sub-circuit in the three-phase sub-circuit includes a thirteenth switch tube VT13 and a fourteenth switch tube VT14, and the seventh phase inductor L31 is also connected to the connection node between the thirteenth switch tube VT13 and the fourteenth switch tube VT14. The second phase sub-circuit includes a fifteenth switch tube VT15 and a sixteenth switch tube VT16, and the eighth phase inductor L32 is also connected to the connection node between the fifteenth switch tube VT15 and the sixteenth switch tube VT16. The third phase sub-circuit includes a seventeenth switch tube VT17 and an eighteenth switch tube VT18, and the ninth phase inductor L33 is also connected to the connection node between the seventeenth switch tube VT17 and the eighteenth switch tube VT18.

[0035] In each of the above-mentioned three-phase sub-circuits, odd-numbered switch tubes can be upper bridge switch tubes, and even-numbered switch tubes can be lower bridge switch tubes. Of course, the specific limitations of this embodiment are only for the convenience of describing the scheme, and are not specific limitations on the protection scope of the scheme.

[0036] The battery pack in this embodiment includes a first battery module B1 and a second battery module B2, and the external power supply device may also include a first power supply device and a second power supply device. It should be noted that the voltage models of the first power supply device and the second power supply device may be different to adapt to different power supply devices, such as charging piles of different voltage models. In some embodiments, the first power supply device and the second power supply device may also be external electric vehicles to achieve vehicle-to-vehicle charging and discharging.

[0037] In some embodiments of the present invention, Figure 1 As shown, the switch module includes multiple switch combinations, each switch combination may include multiple switches among the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8 and the ninth switch K9. Different switch combinations correspond to different working modes of the battery pack. The different switch combinations and the working modes corresponding to the switch combinations will be described in detail below. In this embodiment, one end of the first switch K1 is connected to the positive end of the first battery module B1, the other end of the first switch K1 is connected to the positive end of the DC bus, one end of the second switch K2 is connected to the negative end of the second battery module B2, the other end of the second switch K2 is connected to the negative end of the DC bus, the negative end of the first battery module B1 is connected to the positive end of the second battery module B2 and has a fourth node, the third switch K3 is connected between the first node P1 and the positive end of the first battery module B1, the fourth switch K4 is connected between the third node P3 and the positive end of the first battery module B1, the fifth switch K5 is connected between the second node P2 and the fourth node, the first power supply device is connected to the DC bus through the sixth switch K6 and the seventh switch K7, and the second power supply device is connected to the DC bus through the eighth switch K8 and the ninth switch K9.

[0038] Specifically, Figure 1As shown, the switch module includes nine switches, and the nine switches can form a plurality of different switch combinations, and each switch combination includes a plurality of switches. In addition, in this embodiment, the third switch K3 and the fourth switch K4 are connected in series and connected between the first node P1 and the third node P3, and the first switch K1 and the second switch K2 are connected to the two ends of the battery pack, so that the battery pack is connected to the two ends of the DC bus through the first switch K1 and the second switch K2, and the first battery module B1 and the second battery module B2 constituting the battery pack have a fourth node, and the fourth node is connected to the second node P2 through the fifth switch K5. The two ends of the first power supply device are respectively connected to the sixth switch K6 and the seventh switch K7, and then one of the sixth switch K6 and the seventh switch K7 is connected to one of the positive terminal and the negative terminal of the DC bus, and the other of the sixth switch K6 and the seventh switch K7 is connected to the other of the positive terminal and the negative terminal of the DC bus. The two ends of the second power supply device are respectively connected to the eighth switch K8 and the ninth switch K9, and then one of the eighth switch K8 and the ninth switch K9 is connected to one of the positive terminal and the negative terminal of the DC bus, and the other of the eighth switch K8 and the ninth switch K9 is connected to the other of the positive terminal and the negative terminal of the DC bus.

[0039] The embodiment of the present invention can control the self-heating of the battery pack by controlling different switch combinations consisting of the above-mentioned nine switches, and can also be charged by using an external first power supply device or a second power supply device. In addition, through the application of the motor control circuit, this embodiment can also involve the phase inductance in the motor control circuit in the battery pack charging to achieve voltage reduction charging of the battery pack.

[0040] In some embodiments of the present invention, Figure 1 As shown, the control system also includes a pre-charging module, which includes a pre-charging switch K, a pre-charging resistor R and at least one pre-charging capacitor, at least one pre-charging capacitor is connected between the positive terminal and the negative terminal of the DC bus, one end of the pre-charging switch K is connected to the positive terminal of the DC bus, the other end of the pre-charging switch K is connected to one end of the pre-charging resistor R, and the other end of the pre-charging resistor R is connected to the positive terminal of the first battery module B1.

[0041] Specifically, the pre-charge capacitor of this embodiment can be provided with three pre-charge capacitors, namely, a first pre-charge capacitor C1, a second pre-charge capacitor C2 and a third pre-charge capacitor C3, and each pre-charge capacitor can be arranged between the positive terminal and the negative terminal of the DC bus. Through the coordination between the pre-charge resistor R, the pre-charge switch K, the battery pack and the switch mode, the pre-charge capacitor can be charged by the battery pack before the battery pack operates in the direct charging mode or the buck charging mode.

[0042] More specifically, before the battery pack operates in one or both of the self-heating mode, direct charging mode and buck charging mode, the pre-charge switch K and the second switch K2 are configured to be in a closed state to charge at least one pre-charge capacitor through the battery pack.

[0043] like Figure 2 As shown, the pre-charge switch K and the second switch K2 are controlled to be in a closed state, while the other switches in the switch module are in an off state. At this time, the current in the battery pack is divided after passing through the pre-charge resistor R and the pre-charge switch K. One path passes through the first pre-charge capacitor C1 and the second switch K2 and returns to the battery pack, one path passes through the second pre-charge capacitor C2 and the second switch K2 and returns to the battery pack, and another path passes through the third pre-charge capacitor C3 and the second switch K2 and returns to the battery pack, thereby completing the charging of the first pre-charge capacitor C1, the second pre-charge capacitor C2 and the third pre-charge capacitor C3, that is, completing the pre-charging of the battery pack, ensuring that when the external power supply equipment is pre-charging the battery pack, no circuit failure will be caused by instantaneous discharge, avoiding damage to circuit components, and improving the service life and safety of the battery pack and the electric vehicle.

[0044] It should be noted that during the process of charging the pre-charged capacitor by the battery pack, the specific direction of the current can be found in Figure 2 In addition, before the battery pack operates in the self-heating mode, the pre-charge capacitor also needs to be pre-charged to ensure stable operation of the circuit.

[0045] In some embodiments of the present invention, Figure 3 As shown, the switch combination includes a first switch K1, a second switch K2, a sixth switch K6 and a seventh switch K7. When the first switch K1, the second switch K2, the sixth switch K6 and the seventh switch K7 are configured to be in a closed state, and the third switch K3, the fourth switch K4, the fifth switch K5, the eighth switch K8 and the ninth switch K9 are configured to be in an open state, the battery pack is directly charged through the first power supply device, so that the battery pack operates in a direct charging mode.

[0046] Specifically, taking the first power supply device as a charging pile as an example, when the charging gun of the charging pile is connected to the vehicle to charge the battery, the sixth switch K6 and the seventh switch K7 are in a closed state, and the first switch K1 and the second switch K2 are also controlled to be in a closed state, while the other switches are configured to be in an off state. At this time, the first power supply device can directly charge the battery pack, so that the battery pack works in a direct charging mode. In this mode, the flow direction of the current between the first power supply device and the battery pack can be seen in Figure 3 As indicated by the arrow.

[0047] In some embodiments of the present invention, Figure 4As shown, the switch combination includes a first switch K1, a second switch K2, an eighth switch K8 and a ninth switch K9. When the first switch K1, the second switch K2, the eighth switch K8 and the ninth switch K9 are configured to be in a closed state, the battery pack is directly charged by the second power supply device, so that the battery pack works in a direct charging mode. In this embodiment, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6 and the seventh switch K7 are configured to be in an open state.

[0048] Specifically, taking the second power supply device as a charging pile as an example, when the charging gun of the charging pile is connected to the vehicle to charge the battery, the eighth switch K8 and the ninth switch K9 are in a closed state, and the first switch K1 and the second switch K2 are also controlled to be in a closed state, while the other switches are configured to be in an off state. At this time, the second power supply device can directly charge the battery pack, so that the battery pack works in a direct charging mode. In this mode, the flow direction of the current between the second power supply device and the battery pack can be seen in Figure 4 As indicated by the arrow.

[0049] In some embodiments of the present invention, the switch combination includes a first switch K1, a second switch K2, and a fifth switch K5. When the first switch K1, the fifth switch K5, and at least one upper bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the second switch K2 is configured to be in an open state, the phase inductance corresponding to the at least one upper bridge switch tube is charged through the battery pack, and when the switch states of the first switch K1 and the second switch K2 are replaced, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack works in a self-heating mode. It should be noted that in this embodiment, the at least one upper bridge switch tube and the at least one lower bridge switch tube correspond in number and position, and the specific number can be selected according to the actual application.

[0050] In addition, in the embodiment of the present invention, the other switches of the nine switches in the switch module except the switch combination can be set to the disconnected state by default. For example, in the present embodiment, the switches included in the switch combination are the first switch K1, the second switch K2 and the fifth switch K5, while the third switch K3, the fourth switch K4, the sixth switch K6, the seventh switch K7, the eighth switch K8 and the ninth switch K9 except the switch combination are configured to be in the disconnected state by default, or the states of the third switch K3, the fourth switch K4, the sixth switch K6, the seventh switch K7, the eighth switch K8 and the ninth switch K9 are not limited, but the positions of the third switch K3, the fourth switch K4, the sixth switch K6, the seventh switch K7, the eighth switch K8 and the ninth switch K9 are set to the open circuit state.

[0051] Specifically, self-heating has two timings. The first timing is controlled by switches to allow the battery pack to charge the phase inductor. The second timing is also controlled by switches to allow the electrical energy in the phase inductor to be released to the battery pack. Figure 5 and Figure 6 As shown, the first battery module B1 first charges the phase inductor, and then the phase inductor discharges the second battery module B2 as an example. Figure 5 In the embodiment, the first switch K1, the fifth switch K5 and any upper bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, while the other switches are configured to be in an off state. At this time, the first battery module B1 forms a current loop with the first switch K1, the upper bridge switch tube, the phase inductor and the fifth switch K5, and the loop can charge the phase inductor. When the phase inductor is fully charged or charged for a preset time, it can be converted to the second timing, as shown in the following example. Figure 6 As shown, in the second timing, the switch states of the first switch K1 and the second switch K2 are replaced, and the switch states of the upper bridge switch tube and the corresponding lower bridge switch tube are replaced. In this example, the first switch K1 is configured to be in the off state, the second switch K2 is configured to be in the closed state, and the upper bridge switch tube is configured to be in the off state, and the corresponding lower bridge switch tube is configured to be in the closed state. Figure 5 and Figure 6 In the embodiment shown, the first phase subcircuit in the second motor control circuit 12 and the corresponding fourth phase inductor L21 can be applied to the self-heating of the battery pack. Specifically, in the first timing sequence, the first switch K1, the seventh switch tube VT7 and the fifth switch K5 are configured to be in a closed state, so that the first battery module B1 can charge the fourth phase inductor L21, and in the second timing sequence, the first switch K1 and the seventh switch tube VT7 are configured to be in an off state, and the second switch K2 and the eighth switch tube VT8 are configured to be in a closed state, so that the electric energy in the fourth phase inductor L21 can be charged into the second battery module B2. The first battery module B1 and the second battery module B2 in the battery pack of this embodiment can play a heating role through charging and discharging operations, and this heating method can complete the heating without an additional auxiliary heating device.

[0052] Of course, in this embodiment, the functions of the first battery module B1 and the second battery module B2 in the self-heating mode can also be swapped, that is, the second battery module B2 is used to charge the phase inductor, and the charged phase inductor then charges the first battery module B1. In this embodiment, when the second switch K2, the fifth switch K5, and at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the first switch K1 is configured to be in an open state, the phase inductor corresponding to any lower bridge switch tube is charged through the battery pack, and when the switch states of the first switch K1 and the second switch K2 are replaced, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, the battery pack is charged through the phase inductor, so that the battery pack works in the self-heating mode.

[0053] See Figure 7 , the second switch K2, the fifth switch K5 and any upper bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, while the other switches are configured to be in an off state. At this time, the second battery module B2 forms a current loop with the second switch K2, the lower bridge switch tube, the phase inductor and the fifth switch K5, and the loop can charge the phase inductor. When the phase inductor is fully charged or charged for a preset time, it can be converted to the second timing, as shown in the specific example. Figure 8 As shown, in the second timing, the switch states of the first switch K1 and the second switch K2 are replaced, and the switch states of the upper bridge switch tube and the corresponding lower bridge switch tube are replaced. In this example, the second switch K2 is configured to be in the off state, the first switch K1 is configured to be in the closed state, and the lower bridge switch tube is configured to be in the off state, and the corresponding upper bridge switch tube is configured to be in the closed state. Figure 7 and Figure 8 In the embodiment shown, the first phase subcircuit in the second motor control circuit 12 and the corresponding fourth phase inductor L21 can be applied to the self-heating of the battery pack. Specifically, in the first timing sequence, the second switch K2, the eighth switch tube VT8 and the fifth switch K5 are configured to be in a closed state, so that the second battery module B2 can charge the fourth phase inductor L21, and in the second timing sequence, the second switch K2 and the eighth switch tube VT8 are configured to be in an off state, and the first switch K1 and the seventh switch tube VT7 are configured to be in a closed state, so that the electric energy in the fourth phase inductor L21 can be charged into the first battery module B1. The first battery module B1 and the second battery module B2 in the battery pack of this embodiment can play a heating role through charging and discharging operations, and this heating method can complete the heating without an additional auxiliary heating device.

[0054] It should be noted that Figures 5 to 8The application of the switching tube and phase inductor shown is merely exemplary. In other embodiments, a second phase sub-circuit or a third phase sub-circuit and corresponding phase inductors may also be used. Even multiple phase sub-circuits may be used simultaneously, that is, multiple phase inductors may be charged simultaneously, and multiple phase inductors may also charge the battery simultaneously.

[0055] In some embodiments of the present invention, the switch combination includes a first switch K1, a second switch K2, a fifth switch K5, a sixth switch K6 and a seventh switch K7. When at least one upper bridge switch tube or any lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12, and the first switch K1, the second switch K2, the fifth switch K5, the sixth switch K6 and the seventh switch K7 are configured to be in a closed state, the battery pack is charged through the first power supply device, and the phase inductance corresponding to at least one upper bridge switch tube or the phase inductance corresponding to at least one lower bridge switch tube is charged through the battery pack, wherein the third switch K3, the fourth switch K4, the eighth switch K8 and the ninth switch K9 are configured to be in an open state, and when the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, or the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in a self-heating mode and a direct charging mode.

[0056] Specifically, see Figure 3 As shown, the first power supply device directly charges the battery pack through the sixth switch K6, the seventh switch K7, the first switch K1 and the second switch K2, and in the process of the first power supply device continuously charging the battery pack, the battery pack is also self-heated by controlling the relevant switch tubes and the fifth switch K5 in the second motor control circuit 12. The control during the specific heating process can be referred to above Figures 5 to 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0057] In some embodiments of the present invention, the switch combination includes a first switch K1, a second switch K2, a fifth switch K5, an eighth switch K8 and a ninth switch K9. When at least one upper bridge switch tube or at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12, and the first switch K1, the second switch K2, the fifth switch K5, the eighth switch K8 and the ninth switch K9 are configured to be in a closed state, the battery pack is charged through the second power supply device, and the phase inductance corresponding to at least one upper bridge switch tube or the phase inductance corresponding to at least one lower bridge switch tube is charged through the battery pack, wherein the third switch K3, the fourth switch K4, the sixth switch K6 and the seventh switch K7 are configured to be in an open state, and when the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, or the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in a self-heating mode and a direct charging mode.

[0058] Specifically, see Figure 4 As shown, the second power supply device directly charges the battery pack through the eighth switch K8, the ninth switch K9, the first switch K1 and the second switch K2, and in the process of the first power supply device continuously charging the battery pack, the battery pack is also self-heated by controlling the relevant switch tubes and the fifth switch K5 in the second motor control circuit 12. The control during the specific heating process can be referred to above Figures 5 to 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0059] In some embodiments of the present invention, the switch combination includes a second switch K2, a third switch K3, a sixth switch K6 and a seventh switch K7. When the second switch K2, the third switch K3, the sixth switch K6, the seventh switch K7 and at least one upper bridge switch tube of the three-phase sub-circuit in the first motor control circuit 11 are configured to be in a closed state, the phase inductor and the battery pack corresponding to the at least one upper bridge switch tube are charged through the first power supply device, and when the sixth switch K6, the seventh switch K7 and at least one upper bridge switch tube are reconfigured to be in a disconnected state and the lower bridge switch tube corresponding to at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in a step-down charging mode.

[0060] Specifically, the first power supply device of this embodiment also charges the phase inductance corresponding to the one-phase sub-circuit in the first motor control circuit 11 during the process of charging the battery pack to reduce the charging voltage of the battery pack, and when the first power supply device stops charging the battery pack, the charged phase inductance can continue to charge the battery pack, so that the battery pack can operate in the buck charging mode. The buck charging mode can be divided into two time sequences according to whether the first power supply device is connected or not. More specifically, Fig. 9 and Fig.10 As shown, the first phase sub-circuit in the first motor control circuit 11 is taken as an example for explanation. In the first timing sequence, see Fig. 9 , the second switch K2, the third switch K3, the sixth switch K6, the seventh switch K7 and the first switch tube VT1 are configured to be in a closed state, and the other switches are configured to be in an open state. The current in the first power supply device flows to the sixth switch K6, the first switch tube VT1, the first phase inductor L11, the third switch K3, the battery pack, the second switch K2 and the seventh switch K7 in sequence, and then flows back to the first power supply device to form a loop, in which the first phase inductor L11 and the battery pack can be charged. When the battery pack is about to be fully charged (for example, 90% has been completed), or the first phase inductor L11 has been fully charged, or has been continuously charged for a preset time (for example, one hour), the second time sequence is entered, see Fig.10 In the state of each switch corresponding to the first timing sequence, the sixth switch K6, the seventh switch K7 and the first switch tube VT1 are configured to be in the off state, and the second switch tube VT2 is configured to be in the closed state. After being charged, the current in the first phase inductor L11 flows to the third switch K3, the battery pack, the second switch K2 and the second switch tube VT2 in sequence, and then flows back to the first phase inductor L11 to form a loop. In the loop, the electric energy stored in the first phase inductor L11 can be used to continuously charge the battery pack.

[0061] It should be noted that Figures 9 and 10 The application of the switching tube and phase inductor shown is merely exemplary. In other embodiments, the second phase sub-circuit or the third phase sub-circuit in the first motor control circuit 11 and the corresponding phase inductor may also be used to participate in the voltage reduction charging of the battery pack. Even multiple phase sub-circuits may be used simultaneously, that is, multiple phase inductors may be charged at the same time, and multiple phase inductors may also be used to reduce the voltage of the battery at the same time.

[0062] In some embodiments of the present invention, the switch combination includes a second switch K2, a third switch K3, an eighth switch K8 and a ninth switch K9. When the second switch K2, the third switch K3, the eighth switch K8, the ninth switch K9 and at least one upper bridge switch tube of the three-phase sub-circuit in the first motor control circuit 11 are configured to be in a closed state, and the first switch K1, the fourth switch K4, the fifth switch K5, the sixth switch K6 and the seventh switch K7 are configured to be in an open state, the phase inductor and the battery pack corresponding to the at least one upper bridge switch tube are charged through the second power supply device, and when the eighth switch K8, the ninth switch K9 and the at least one upper bridge switch tube are reconfigured to be in an open state, and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in a step-down charging mode.

[0063] Specifically, in the process of charging the battery pack, the second power supply device of this embodiment also charges the phase inductance corresponding to the one-phase sub-circuit in the first motor control circuit 11 to reduce the charging voltage of the battery pack, and when the second power supply device stops charging the battery pack, the charged phase inductance can continue to charge the battery pack, so that the battery pack can work in the buck charging mode. The buck charging mode can be divided into two time sequences according to whether the second power supply device is connected or not. More specifically, Fig.11 and Fig.10 As shown, the first phase sub-circuit in the first motor control circuit 11 is taken as an example for explanation. In the first timing sequence, see Fig.11 , the second switch K2, the third switch K3, the eighth switch K8, the ninth switch K9 and the first switch tube VT1 are configured to be in a closed state, and the other switches are configured to be in an open state. The current in the second power supply device flows to the eighth switch K8, the first switch tube VT1, the first phase inductor L11, the third switch K3, the battery pack, the second switch K2 and the ninth switch K9 in sequence, and then flows back to the second power supply device to form a loop, in which the first phase inductor L11 and the battery pack can be charged. When the battery pack is about to be fully charged (for example, 90% has been completed), or the first phase inductor L11 has been fully charged, or has been continuously charged for a preset time (for example, one hour), the second sequence is entered, see Fig.10 In the state of each switch corresponding to the first timing sequence, the eighth switch K8, the ninth switch K9 and the first switch tube VT1 are configured to be in the off state, and the second switch tube VT2 is configured to be in the closed state. After being charged, the current in the first phase inductor L11 flows to the third switch K3, the battery pack, the second switch K2 and the second switch tube VT2 in sequence, and then flows back to the first phase inductor L11 to form a loop. In the loop, the electric energy stored in the first phase inductor L11 can be used to continuously charge the battery pack.

[0064] It should be noted that Fig.11 and Fig.10 The application of the switching tube and phase inductor shown is merely exemplary. In other embodiments, the second phase sub-circuit or the third phase sub-circuit in the first motor control circuit 11 and the corresponding phase inductor may also be used to participate in the voltage reduction charging of the battery pack. Even multiple phase sub-circuits may be used simultaneously, that is, multiple phase inductors may be charged at the same time, and multiple phase inductors may also be used to reduce the voltage of the battery at the same time.

[0065] In some embodiments of the present invention, the switch combination includes a second switch K2, a fourth switch K4, an eighth switch K8 and a ninth switch K9. When the second switch K2, the fourth switch K4, the eighth switch K8, the ninth switch K9 and at least one upper bridge switch tube of the three-phase sub-circuit in the third motor control circuit 13 are configured to be in a closed state, and the first switch K1, the third switch K3, the fifth switch K5, the sixth switch K6 and the seventh switch K7 are configured to be in an open state, the phase inductor and the battery pack corresponding to the at least one upper bridge switch tube are charged through the second power supply device, and when the eighth switch K8, the ninth switch K9 and the corresponding at least one upper bridge switch tube are reconfigured to be in an open state, and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in a step-down charging mode.

[0066] Specifically, in the process of charging the battery pack, the second power supply device of this embodiment also charges the phase inductance corresponding to the one-phase sub-circuit in the third motor control circuit 13 to reduce the charging voltage of the battery pack, and when the second power supply device stops charging the battery pack, the charged phase inductance can continue to charge the battery pack, so that the battery pack can work in the buck charging mode. The buck charging mode can be divided into two time sequences according to whether the second power supply device is connected or not. More specifically, Fig.12 and Fig.13 As shown, the first phase sub-circuit in the third motor control circuit 13 is taken as an example for explanation. In the first timing sequence, see Fig.12 , the second switch K2, the fourth switch K4, the eighth switch K8, the ninth switch K9 and the thirteenth switch tube VT13 are configured to be in a closed state, and the other switches are configured to be in an open state. The current in the second power supply device flows to the eighth switch K8, the thirteenth switch tube VT13, the seventh phase inductor L31, the fourth switch K4, the battery pack, the second switch K2 and the ninth switch K9 in sequence, and then flows back to the second power supply device to form a loop, in which the seventh phase inductor L31 and the battery pack can be charged. When the battery pack is about to be fully charged (for example, 90% completed), or the seventh phase inductor L31 is fully charged, or the charging continues for a preset time (for example, one hour), the second time sequence is entered, see Fig.13In the states of the switches corresponding to the first timing sequence, the eighth switch K8, the ninth switch K9 and the thirteenth switch tube VT13 are configured to be in the off state, and the fourteenth switch tube VT14 is configured to be in the closed state. After being charged, the current in the seventh-phase inductor L31 flows to the fourth switch K4, the battery pack, the second switch K2 and the fourteenth switch tube VT14 in sequence, and then flows back to the seventh-phase inductor L31 to form a loop. In the loop, the electric energy stored in the seventh-phase inductor L31 can be used to continuously charge the battery pack.

[0067] It should be noted that Fig.12 and Fig.13 The application of the switching tube and phase inductor shown is merely exemplary. In other embodiments, the second phase sub-circuit or the third phase sub-circuit in the third motor control circuit 13 and the corresponding phase inductor may also be used to participate in the voltage reduction charging of the battery pack. Even multiple phase sub-circuits may be used simultaneously, that is, multiple phase inductors may be charged at the same time, and multiple phase inductors may also be used to reduce the voltage of the battery at the same time.

[0068] In some embodiments of the present invention, the switch combination includes a second switch K2, a fourth switch K4, a sixth switch K6 and a seventh switch K7. When the second switch K2, the fourth switch K4, the sixth switch K6, the seventh switch K7 and at least one upper bridge switch tube of the three-phase sub-circuit in the third motor control circuit 13 are configured to be in a closed state, and the first switch K1, the third switch K3, the fifth switch K5, the eighth switch K8 and the ninth switch K9 are configured to be in an open state, the phase inductor and the battery pack corresponding to the at least one upper bridge switch tube are charged through the first power supply device, and when the sixth switch K6, the seventh switch K7 and the above-mentioned at least one upper bridge switch tube are reconfigured to be in an open state, and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in a step-down charging mode.

[0069] Specifically, in the process of charging the battery pack, the first power supply device of this embodiment also charges the phase inductance corresponding to the one-phase sub-circuit in the third motor control circuit 13 to reduce the charging voltage of the battery pack, and when the first power supply device stops charging the battery pack, the charged phase inductance can continue to charge the battery pack, so that the battery pack can work in the buck charging mode. The buck charging mode can be divided into two time sequences according to whether the first power supply device is connected or not. More specifically, Fig.14 and Fig.13 As shown, the first phase sub-circuit in the third motor control circuit 13 is taken as an example for explanation. In the first timing sequence, see Fig.14, the second switch K2, the fourth switch K4, the sixth switch K6, the seventh switch K7 and the thirteenth switch tube VT13 are configured to be in a closed state, and the other switches are configured to be in an open state. The current in the first power supply device flows to the sixth switch K6, the thirteenth switch tube VT13, the seventh phase inductor L31, the fourth switch K4, the battery pack, the second switch K2 and the seventh switch K7 in sequence, and then flows back to the first power supply device to form a loop, in which the seventh phase inductor L31 and the battery pack can be charged. When the battery pack is about to be fully charged (for example, 90% has been completed), or the seventh phase inductor L31 has been fully charged, or has been continuously charged for a preset time (for example, one hour), the second time sequence is entered, see Fig.13 In the states of the switches corresponding to the first timing sequence, the sixth switch K6, the seventh switch K7 and the thirteenth switch tube VT13 are configured to be in the off state, and the fourteenth switch tube VT14 is configured to be in the closed state. After being charged, the current in the seventh-phase inductor L31 flows to the fourth switch K4, the battery pack, the second switch K2 and the fourteenth switch tube VT14 in sequence, and then flows back to the seventh-phase inductor L31 to form a loop. In the loop, the electric energy stored in the seventh-phase inductor L31 can be used to continuously charge the battery pack.

[0070] It should be noted that Fig.14 and Fig.13 The application of the switching tube and phase inductor shown is merely exemplary. In other embodiments, the second phase sub-circuit or the third phase sub-circuit in the third motor control circuit 13 and the corresponding phase inductor may also be used to participate in the voltage reduction charging of the battery pack. Even multiple phase sub-circuits may be used simultaneously, that is, multiple phase inductors may be charged at the same time, and multiple phase inductors may also be used to reduce the voltage of the battery at the same time.

[0071] In some embodiments of the present invention, the switch combination includes a second switch K2, a third switch K3, a fifth switch K5, a sixth switch K6 and a seventh switch K7. When the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6, the seventh switch K7, any upper bridge switch tube of the three-phase sub-circuit in the first motor control circuit 11 and at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the first switch K1, the fourth switch K4, the eighth switch K8 and the ninth switch K9 are configured to be in an open state, the phase inductor and the battery pack corresponding to at least one upper bridge switch tube of the first motor control circuit 11 are powered by the first power supply device. Charging, and charging the phase inductance corresponding to at least one lower bridge switch tube of the second motor control circuit 12 through the battery pack, and when the sixth switch K6 and the seventh switch K7 are reconfigured to the open state, the first switch K1 is reconfigured to the closed state, and the switching states of any upper bridge switch tube and the corresponding lower bridge switch tube of the first motor control circuit 11 are replaced, and the switching states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit 12 are replaced, the battery pack is charged through the charged phase inductance of the first motor control circuit 11 and the phase inductance of the second motor control circuit 12, so that the battery pack operates in self-heating mode and buck charging mode.

[0072] Specifically, see Fig. 9 and Fig.10 As shown, the first power supply device, the first motor control circuit 11, the second switch K2, the third switch K3, the sixth switch K6 and the seventh switch K7 can be used to realize step-down charging of the battery pack. When the battery pack is in the step-down charging mode, this embodiment can also realize self-heating of the battery pack by cooperating with the second motor control circuit 12, the fifth switch K5, the first switch K1 and the second switch K2. For details, please refer to Figure 7 and Figure 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0073] In some embodiments of the present invention, the switch combination includes a second switch K2, a third switch K3, a fifth switch K5, an eighth switch K8 and a ninth switch K9. When the second switch K2, the third switch K3, the fifth switch K5, the eighth switch K8, the ninth switch K9, at least one upper bridge switch tube of the three-phase sub-circuit in the first motor control circuit 11 and at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the first switch K1, the fourth switch K4, the sixth switch K6 and the seventh switch K7 are configured to be in an open state, the phase inductor and the battery pack corresponding to at least one upper bridge switch tube of the first motor control circuit 11 are powered by the second power supply device. Charging, and charging the phase inductance corresponding to at least one lower bridge switch tube of the second motor control circuit 12 through the battery pack, and when the eighth switch K8 and the ninth switch 9 are reconfigured to the open state, the first switch K1 is reconfigured to the closed state, and the switching states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the first motor control circuit 11 are replaced, and the switching states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit 12 are replaced, the battery pack is charged through the charged phase inductance of the first motor control circuit 11 and the phase inductance of the second motor control circuit 12, so that the battery pack operates in self-heating mode and buck charging mode.

[0074] Specifically, see Fig.10 and Fig.11 As shown, the second power supply device, the first motor control circuit 11, the second switch K2, the third switch K3, the eighth switch K8 and the ninth switch K9 can be used to realize step-down charging of the battery pack. When the battery pack is in the step-down charging mode, the present embodiment can also realize self-heating of the battery pack by cooperating with the second motor control circuit 12, the fifth switch K5, the first switch K1 and the second switch K2. For details, please refer to Figure 7 and Figure 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0075] In some embodiments of the present invention, the switch combination includes a second switch K2, a fourth switch K4, a fifth switch K5, an eighth switch K8 and a ninth switch K9. When the second switch K2, the fourth switch K4, the fifth switch K5, the eighth switch K8, the ninth switch K9, at least one upper bridge switch tube of the three-phase sub-circuit in the third motor control circuit 13 and at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the first switch K1, the third switch K3, the sixth switch K6 and the seventh switch K7 are configured to be in an open state, the phase inductor and the battery pack corresponding to at least one upper bridge switch tube of the third motor control circuit 13 are powered by the second power supply device. Charging, and charging the phase inductance corresponding to at least one lower bridge switch tube of the second motor control circuit 12 through the battery pack, and when the eighth switch K8 and the ninth switch K9 are reconfigured to the open state, the first switch K1 is reconfigured to the closed state, and the switching states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the third motor control circuit 13 are replaced, and the switching states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit 12 are replaced, the battery pack is charged through the charged phase inductance of the third motor control circuit 13 and the phase inductance of the second motor control circuit 12, so that the battery pack operates in self-heating mode and buck charging mode.

[0076] Specifically, see Fig.12 and Fig.13 As shown, the second power supply device, the third motor control circuit 13, the second switch K2, the fourth switch K4, the eighth switch K8 and the ninth switch K9 can be used to realize the step-down charging of the battery pack. When the battery pack is in the step-down charging mode, this embodiment can also realize the self-heating of the battery pack by cooperating with the second motor control circuit 12, the fifth switch K5, the first switch K1 and the second switch K2. For details, please refer to Figure 7 and Figure 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0077] In some embodiments of the present invention, the switch combination includes a second switch K2, a fourth switch K4, a fifth switch K5, a sixth switch K6 and a seventh switch K7. When the second switch K2, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, at least one upper bridge switch tube of the three-phase sub-circuit in the third motor control circuit 13 and at least one lower bridge switch tube of the three-phase sub-circuit in the second motor control circuit 12 are configured to be in a closed state, and the first switch K1, the third switch K3, the eighth switch K8 and the ninth switch K9 are configured to be in an open state, the phase inductor and the battery pack corresponding to at least one upper bridge switch tube of the third motor control circuit 13 are powered by the first power supply device. Charging, and charging the phase inductance corresponding to at least one lower bridge switch tube of the second motor control circuit 12 through the battery pack, and when the sixth switch K6 and the seventh switch K7 are reconfigured to the open state, the first switch K1 is reconfigured to the closed state, and the switching states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the third motor control circuit 13 are replaced, and the switching states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit 12 are replaced, the battery pack is charged through the charged phase inductance of the third motor control circuit 13 and the phase inductance of the second motor control circuit 12, so that the battery pack operates in self-heating mode and buck charging mode.

[0078] Specifically, see Fig.13 and Fig.14 As shown, the first electrical device, the third motor control circuit 13, the second switch K2, the fourth switch K4, the sixth switch K6 and the seventh switch K7 can be used to realize step-down charging of the battery pack. When the battery pack is in the step-down charging mode, this embodiment can also realize self-heating of the battery pack by cooperating with the second motor control circuit 12, the fifth switch K5, the first switch K1 and the second switch K2. For details, please refer to Figure 7 and Figure 8 To avoid redundancy, the relevant descriptions of the corresponding embodiments will not be repeated here.

[0079] In summary, the embodiments of the present invention provide multiple charging modes for the battery pack by combining the motor control circuit, which can improve the environmental adaptability of the electric vehicle, reduce the design cost of the electric vehicle, and ensure the charging efficiency of the battery pack.

[0080] Fig.15 1 is a structural block diagram of an electric vehicle in an embodiment of the present invention.

[0081] Furthermore, if Fig.15As shown, the present invention proposes an electric vehicle 100, which includes a control 20 and a battery pack control system 10 of the electric vehicle in the above-mentioned embodiment, wherein the controller is connected to the switch module and is used to configure the switch state of the switch module, the first motor control circuit, the second motor control circuit and the third motor control circuit to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, so that the battery pack operates in one or two working modes among a self-heating mode, a direct charging mode and a buck charging mode.

[0082] The electric vehicle of the embodiment of the present invention can improve the environmental adaptability of the electric vehicle through the battery pack control system of the electric vehicle in the above embodiment, while reducing the design cost of the electric vehicle and ensuring the charging efficiency of the battery pack.

[0083] Fig.16 It is a flow chart of the battery pack control method of an electric vehicle in an embodiment of the present invention.

[0084] Furthermore, if Fig.16 As shown, the present invention proposes a battery pack control method for an electric vehicle, which is applied to the electric vehicle of the above embodiment and specifically includes the following steps:

[0085] S10, responding to the battery pack control instruction.

[0086] S20, configuring the switch state of the switch module, the first motor control circuit, the second motor control circuit and the third motor control circuit according to the control instruction to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and the external power supply device, so that the battery pack operates in one or two working modes among the self-heating mode, the direct charging mode and the buck charging mode.

[0087] It should be noted that the specific implementation of the battery pack control method of the electric vehicle in this embodiment can refer to the specific implementation of the battery pack control system in the electric vehicle in the above embodiment, and will not be repeated here to avoid redundancy.

[0088] In summary, the battery pack control method of an electric vehicle in an embodiment of the present invention provides a plurality of charging modes to the battery pack by utilizing a motor control circuit, which can improve the environmental adaptability of the electric vehicle, reduce the design cost of the electric vehicle, and ensure the charging efficiency of the battery pack.

[0089] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0090] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0093] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.

[0094] In the present invention, unless otherwise clearly specified or limited in the embodiments, the terms "installed", "connected", "connected" and "fixed" etc. in the embodiments should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection. It can be understood that it can also be a mechanical connection, an electrical connection, etc.; of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific implementation situation.

[0095] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A battery pack control system for an electric vehicle, characterized in that: The electric vehicle comprises a first motor control circuit, a second motor control circuit and a third motor control circuit, and the control system comprises: a switch module, the switch module being respectively connected between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, and being adapted to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and the external power supply device, so that the battery pack operates in one or two operating modes of a self-heating mode, a direct charging mode and a buck charging mode; Wherein, each of the first motor control circuit, the second motor control circuit and the third motor control circuit comprises at least one phase subcircuit, and each phase subcircuit comprises an upper bridge switch tube, a lower bridge switch tube and a phase inductor, the upper bridge switch tube and the lower bridge switch tube are connected in series between the positive terminal and the negative terminal of the DC bus, the node between the upper bridge switch tube and the lower bridge switch tube is connected to one end of the phase inductor, the other end of the phase inductor in each phase subcircuit in the first motor control circuit is connected and has a first node, the other end of the phase inductor in each phase subcircuit in the second motor control circuit is connected and has a second node, and the other end of the phase inductor in each phase subcircuit in the third motor control circuit is connected and has a third node; The switch module includes a plurality of switch combinations, and the switch combination includes a plurality of switches selected from a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch and a ninth switch, and different switch combinations correspond to different working modes of the battery pack, wherein one end of the first switch is connected to the positive end of the first battery module of the battery pack, the other end of the first switch is connected to the positive end of the DC bus, one end of the second switch is connected to the negative end of the second battery module of the battery pack, the other end of the second switch is connected to the negative end of the DC bus, the negative end of the first battery module is connected to the positive end of the second battery module and has a fourth node, the third switch is connected between the first node and the positive end of the first battery module, the fourth switch is connected between the third node and the positive end of the first battery module, the fifth switch is connected between the second node and the fourth node, the DC bus is suitable for being connected to the first power supply device of the external power supply device through the sixth switch and the seventh switch, and the DC bus is also suitable for being connected to the second power supply device of the external power supply device through the eighth switch and the ninth switch.

2. The battery pack control system according to claim 1, characterized in that: The electric vehicle also includes a pre-charge switch, a pre-charge resistor and at least one pre-charge capacitor, wherein the at least one pre-charge capacitor is connected between the positive terminal and the negative terminal of the DC bus, one end of the pre-charge switch is connected to the positive terminal of the DC bus, the other end of the pre-charge switch is connected to one end of the pre-charge resistor, and the other end of the pre-charge resistor is connected to the positive terminal of the first battery module.

3. The battery pack control system according to claim 2, characterized in that: Before the battery pack operates in one or both of the self-heating mode, the direct charging mode and the buck charging mode, the pre-charge switch and the second switch are configured to be in a closed state to charge the at least one pre-charge capacitor through the battery pack.

4. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch, the sixth switch and the seventh switch. When the first switch, the second switch, the sixth switch and the seventh switch are configured to be in a closed state, the battery pack is directly charged through the first power supply device so that the battery pack operates in the direct charging mode.

5. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch, the eighth switch and the ninth switch. When the first switch, the second switch, the eighth switch and the ninth switch are configured to be in a closed state, the battery pack is directly charged through the second power supply device so that the battery pack operates in the direct charging mode.

6. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch and the fifth switch. When the first switch, the fifth switch and at least one upper bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, and the second switch is configured to be in an open state, the phase inductance corresponding to the at least one upper bridge switch tube is charged through the battery pack, and when the switching states of the first switch and the second switch are replaced and the switching states of the at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in the self-heating mode.

7. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch and the fifth switch. When the second switch, the fifth switch and at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, and the first switch is configured to be in an open state, the phase inductance corresponding to the at least one lower bridge switch tube is charged through the battery pack, and when the switching states of the first switch and the second switch are replaced and the switching states of the at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in the self-heating mode.

8. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch, the fifth switch, the sixth switch and the seventh switch. When at least one upper bridge switch tube or at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit, and the first switch, the second switch, the fifth switch, the sixth switch and the seventh switch are configured to be in a closed state, the battery pack is charged through the first power supply device, and the phase inductance corresponding to the at least one upper bridge switch tube or the phase inductance corresponding to the at least one lower bridge switch tube is charged through the battery pack, and when the switching states of the at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, or the switching states of the at least one lower bridge switch tube and the corresponding upper bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in the self-heating mode and the direct charging mode.

9. The battery pack control system according to claim 1, characterized in that: The switch combination includes the first switch, the second switch, the fifth switch, the eighth switch and the ninth switch. When at least one upper bridge switch tube or at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit, and the first switch, the second switch, the fifth switch, the eighth switch and the ninth switch are configured to be in a closed state, the battery pack is charged through the second power supply device, and the phase inductance corresponding to the at least one upper bridge switch tube or the phase inductance corresponding to the at least one lower bridge switch tube is charged through the battery pack, and when the switching states of the at least one upper bridge switch tube and the corresponding lower bridge switch tube are replaced, or the switching states of the at least one lower bridge switch tube and the corresponding upper bridge switch tube are replaced, the battery pack is charged through the phase inductance, so that the battery pack operates in the self-heating mode and the direct charging mode.

10. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the third switch, the sixth switch and the seventh switch. When the second switch, the third switch, the sixth switch, the seventh switch and at least one upper bridge switch tube of at least one phase sub-circuit in the first motor control circuit are configured to be in a closed state, the phase inductor corresponding to the at least one upper bridge switch tube and the battery pack are charged through the first power supply device, and when the sixth switch, the seventh switch and the at least one upper bridge switch tube are reconfigured to be in an open state and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in the buck charging mode.

11. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the third switch, the eighth switch and the ninth switch. When the second switch, the third switch, the eighth switch, the ninth switch and at least one upper bridge switch tube of at least one phase sub-circuit in the first motor control circuit are configured to be in a closed state, the phase inductor corresponding to the at least one upper bridge switch tube and the battery pack are charged through the second power supply device. When the eighth switch, the ninth switch and the at least one upper bridge switch tube are reconfigured to be in an open state and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in the buck charging mode.

12. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the fourth switch, the eighth switch and the ninth switch. When the second switch, the fourth switch, the eighth switch, the ninth switch and at least one upper bridge switch tube of at least one phase sub-circuit in the third motor control circuit are configured to be in a closed state, the phase inductor corresponding to the at least one upper bridge switch tube and the battery pack are charged through the second power supply device, and when the eighth switch, the ninth switch and the at least one upper bridge switch tube are reconfigured to be in an open state and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in the buck charging mode.

13. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the fourth switch, the sixth switch and the seventh switch. When the second switch, the fourth switch, the sixth switch, the seventh switch and at least one upper bridge switch tube of at least one phase sub-circuit in the third motor control circuit are configured to be in a closed state, the phase inductor corresponding to the at least one upper bridge switch tube and the battery pack are charged through the first power supply device, and when the sixth switch, the seventh switch and the at least one upper bridge switch tube are reconfigured to be in an open state and the lower bridge switch tube corresponding to the at least one upper bridge switch tube is configured to be in a closed state, the battery pack is charged through the phase inductor, so that the battery pack operates in the buck charging mode.

14. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch. When the second switch, the third switch, the fifth switch, the sixth switch, the seventh switch, at least one upper bridge switch tube of at least one phase sub-circuit in the first motor control circuit and at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, the phase inductance corresponding to the at least one upper bridge switch tube of the first motor control circuit and the battery pack are charged by the first power supply device, and the second motor control circuit is charged by the battery pack. The phase inductance corresponding to at least one lower bridge switch tube is charged, and when the sixth switch and the seventh switch are reconfigured to an open state, the first switch is reconfigured to a closed state, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the first motor control circuit are replaced, and the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit are replaced, the battery pack is charged through the charged phase inductance of the first motor control circuit and the phase inductance of the second motor control circuit, so that the battery pack operates in the self-heating mode and the step-down charging mode.

15. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the third switch, the fifth switch, the eighth switch and the ninth switch. When the second switch, the third switch, the fifth switch, the eighth switch, the ninth switch, at least one upper bridge switch tube of at least one phase sub-circuit in the first motor control circuit and at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, the phase inductance corresponding to the at least one upper bridge switch tube of the first motor control circuit and the battery pack are charged by the second power supply device, and the second motor control circuit is charged by the battery pack. The phase inductance corresponding to at least one lower bridge switch tube is charged, and when the eighth switch and the ninth switch are reconfigured to the open state, the first switch is reconfigured to the closed state, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the first motor control circuit are replaced, and the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit are replaced, the battery pack is charged through the charged phase inductance of the first motor control circuit and the phase inductance of the second motor control circuit, so that the battery pack operates in the self-heating mode and the step-down charging mode.

16. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the fourth switch, the fifth switch, the eighth switch and the ninth switch. When the second switch, the fourth switch, the fifth switch, the eighth switch, the ninth switch, at least one upper bridge switch tube of at least one phase sub-circuit in the third motor control circuit and at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, the phase inductance corresponding to the at least one upper bridge switch tube of the third motor control circuit and the battery pack are charged by the second power supply device, and the second motor control circuit is charged by the battery pack. The phase inductance corresponding to at least one lower bridge switch tube is charged, and when the eighth switch and the ninth switch are reconfigured to the open state, the first switch is reconfigured to the closed state, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the third motor control circuit are replaced, and the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit are replaced, the battery pack is charged through the charged phase inductance of the third motor control circuit and the phase inductance of the second motor control circuit, so that the battery pack operates in the self-heating mode and the step-down charging mode.

17. The battery pack control system according to claim 1, characterized in that: The switch combination includes the second switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch. When the second switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, at least one upper bridge switch tube of at least one phase sub-circuit in the third motor control circuit and at least one lower bridge switch tube of at least one phase sub-circuit in the second motor control circuit are configured to be in a closed state, the phase inductance corresponding to the at least one upper bridge switch tube of the third motor control circuit and the battery pack are charged by the first power supply device, and the second motor control circuit is charged by the battery pack. The phase inductance corresponding to at least one lower bridge switch tube is charged, and when the sixth switch and the seventh switch are reconfigured to an open state, the first switch is reconfigured to a closed state, and the switch states of at least one upper bridge switch tube and the corresponding lower bridge switch tube of the third motor control circuit are replaced, and the switch states of at least one lower bridge switch tube and the corresponding upper bridge switch tube of the second motor control circuit are replaced, the battery pack is charged through the charged phase inductance of the third motor control circuit and the phase inductance of the second motor control circuit, so that the battery pack operates in the self-heating mode and the buck charging mode.

18. An electric vehicle, characterized in that: The electric vehicle includes a controller and a battery pack control system of the electric vehicle according to any one of claims 1 to 17, the controller being connected to a switch module and being used to configure a switch state of the switch module, a first motor control circuit, a second motor control circuit and a third motor control circuit to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit and an external power supply device, so that the battery pack operates in one or both of the self-heating mode, the direct charging mode and the buck charging mode.

19. A battery pack control method for an electric vehicle, characterized in that: The control method comprises: responding to a battery pack control instruction; configuring the switch state of the switch module, the first motor control circuit, the second motor control circuit, and the third motor control circuit according to the control instruction to control the connection between the battery pack, the first motor control circuit, the second motor control circuit, the third motor control circuit, and an external power supply device, so that the battery pack operates in one or two operating modes among a self-heating mode, a direct charging mode, and a buck charging mode; Wherein, the control method is applied to the electric vehicle described in claim 18.

Images