Battery self-heating device, battery self-heating method, and vehicle

Abstract

The battery self-heating device includes a first energy processing device (10), a second energy processing device (20) connected to each other, and a controller, the controller being configured to control the first inverter (11) and the second inverter (21) to be turned on / off in a first predetermined state so that the first power battery (1) and the second power battery (2) are charged / discharged by the first energy processing device (10) and the second energy processing device (20) to realize heating of the first power battery (1) and the second power battery (2). A battery self-heating method and an electric vehicle are further disclosed. The device makes full use of the characteristics of some electric vehicles having dual motors and dual electric control systems, and by connecting the dual motors with a neutral wire, the efficiency and power of the self-heating of the power battery can be greatly improved and low cost can be ensured.

Description

[Technical field]

[0001] This disclosure claims priority to a Chinese patent application bearing application number 202210346572.X and title "Battery self-heating device, battery self-heating method and vehicle" filed with the China National Intellectual Property Office on March 31, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of vehicles, and in particular to a battery self-heating device, a battery self-heating method, and a vehicle. [Background technology]

[0003] In a low temperature environment, the charging performance of a pure electric vehicle decreases, so it is necessary to heat the power battery of the pure electric vehicle to increase the temperature of the main body and ensure the power of the pure electric vehicle in a cold environment.

[0004] In the related art, the heating methods of the battery mainly include external heating and internal heating. External heating is to add additional heating equipment to heat the battery, and such a heating method is expensive and has low heating efficiency. The internal heating principle mainly utilizes the charge and discharge cycle of the battery and the internal resistance of the battery to generate self-heating, but the heating power in the currently feasible battery self-heating technology is limited. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present disclosure is to provide a battery self-heating device, a battery self-heating method, and a vehicle to solve or partially solve the above technical problems. [Means for solving the problem]

[0006] In order to achieve the above object, the battery self-heating device according to the present disclosure includes a first energy processing device, a second energy processing device, and a controller, which are connected to each other, the first energy processing device includes a first inverter and a first motor, the second energy processing device includes a second inverter and a second motor, a first bus terminal of the first inverter is connected to a positive electrode of a first power battery, a second bus terminal of the first inverter is connected to a negative electrode of the first power battery, a negative electrode of the second power battery, and a second bus terminal of the second inverter, and a first terminal of the first motor is connected to a midpoint of the first inverter. a first terminal of the second motor is connected to a midpoint of the second inverter, a second terminal of the first motor is commonly connected to form a first neutral point, and is connected by a neutral wire to a second neutral point formed by commonly connecting the second terminals of the second motor, and the controller is configured to control the conduction / cut-off of the first inverter and the second inverter in a first predetermined state so that the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device to realize heating of the first power battery and the second power battery.

[0007] Preferably, the device further includes a first switch, the first switch being connected between the first neutral point and the second neutral point, and when the first switch is turned on, the first neutral point and the second neutral point are conductive, and the controller is configured to control the first switch to be on in the first predetermined state.

[0008] Preferably, the device further includes a second switch, the second switch being connected to a positive terminal of the first power battery, a positive terminal of the second power battery, a first bus terminal of the first inverter, and a first bus terminal of the second inverter, and when the second switch is turned on, the positive terminal of the first power battery, the positive terminal of the second power battery, the first bus terminal of the first inverter, and the first bus terminal of the second inverter are conductive, and the controller is configured to control the first switch to be off and control the second switch to be on in a second predetermined state so that an external power source charges the first power battery and the second power battery.

[0009] Preferably, the controller is configured to control the upper bridge arm of the first inverter and the lower bridge arm of the second inverter to be simultaneously conductive, or to control the lower bridge arm of the first inverter and the upper bridge arm of the second inverter to be simultaneously conductive, so as to enable the first power battery and the second power battery to be charged / discharged by the first energy processing device and the second energy processing device in the first predetermined state, thereby realizing heating of the first power battery and the second power battery.

[0010] Preferably, the device further includes a third energy processing device and a third switch, the third energy processing device includes a third inverter and a third motor, a first bus terminal of the third inverter is connected to the positive pole of the second power battery, the first bus terminal of the second inverter and the second switch, a second bus terminal of the third inverter is connected to the negative pole of the first power battery, the negative pole of the second power battery, the second bus terminal of the first inverter and the second bus terminal of the second inverter, a first terminal of the third motor is connected to the midpoint of the third inverter, and a second terminal of the third motor is connected to a common to form a third motor. a third neutral point is formed, and the third neutral point is connected to the first switch and the second neutral point via a third switch, and the controller is configured to control the first switch and the third switch to be on, control the second switch to be off, and control the conduction / cutoff of the first inverter, the second inverter, and the third inverter in order to charge / discharge the first power battery and the second power battery through the first energy processing device, the second energy processing device, and the third energy processing device in the first predetermined state, thereby realizing heating of the first power battery and the second power battery.

[0011] Preferably, the device further includes a fourth energy processing device and a fourth switch, the fourth energy processing device includes a fourth inverter and a fourth motor, a first bus terminal of the fourth inverter is connected to the positive pole of the first power battery, a first bus terminal of the first inverter and the second switch, a second bus terminal of the fourth inverter is connected to the negative pole of the first power battery, the negative pole of the second power battery, a second bus terminal of the first inverter and a second bus terminal of the second inverter, a first terminal of the fourth motor is connected to a midpoint of the fourth inverter, and a second terminal of the fourth motor is connected to a common to form a fourth motor. A fourth neutral point is formed, and the fourth neutral point is connected to the first switch and the first neutral point via a fourth switch, and the controller is configured to control the first switch and the fourth switch to be on, control the second switch to be off, and control the first inverter, the second inverter, and the fourth inverter to be turned on / off, so that, in the first predetermined state, the first power battery and the second power battery are charged / discharged by the first energy processing device, the second energy processing device, and the fourth energy processing device, thereby realizing heating of the first power battery and the second power battery.

[0012] Preferably, the apparatus further comprises a fifth energy processor and a sixth energy processor; the fifth energy processing device includes a fifth inverter and a fifth motor, and the sixth energy processing device includes a sixth inverter and a sixth motor; The first bus terminal of the fifth inverter is connected to the negative pole of the first power battery, the negative pole of the second power battery, the positive pole of the third power battery, the positive pole of the fourth power battery, the second bus terminal of the first inverter, and the second bus terminal of the second inverter; the second bus terminal of the fifth inverter is connected to the negative pole of the third power battery, the negative pole of the fourth power battery, and the second bus terminal of the sixth inverter; the first terminal of the fifth motor is connected to the midpoint of the fifth inverter; the first terminal of the sixth motor is connected to the midpoint of the sixth inverter; the second terminals of the fifth motor are commonly connected to form a fifth neutral point, and the second terminal of the sixth motor is commonly connected; and a sixth neutral point formed by the first and second energy processing devices, and the controller is configured to control the first switch to be on, control the second switch to be off, and control the conduction / cutoff of the first inverter, the second inverter, the fifth inverter, and the sixth inverter, so that, in the first predetermined state, the first power battery, the second power battery, the third power battery, and the fourth power battery are charged / discharged by the first energy processing device, the second energy processing device, the fifth energy processing device, and the sixth energy processing device, thereby realizing heating of the first power battery, the second power battery, the third power battery, and the fourth power battery.

[0013] Preferably, the device further includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch, the fifth switch is connected between the fifth neutral point and the sixth neutral point, when the fourth switch is turned on, the fourth neutral point and the fifth neutral point are conductive, a first terminal of the sixth switch is connected to a first bus terminal of the fifth inverter and a first terminal of the eighth switch, a second terminal of the sixth switch is connected to a first bus terminal of the sixth inverter, a second bus terminal of the second inverter, a second bus terminal of the first inverter, a negative pole of the second power battery, a positive pole of the fourth power battery, and a first terminal of the seventh switch, when the sixth switch is turned on, the first terminal and the second terminal of the sixth switch are conductive, and a second terminal of the seventh switch is connected to a second bus terminal of the fifth inverter, a third terminal of the seventh switch connected to the negative electrode of the first power battery, the positive electrode of the third power battery, and the second terminal of the eighth switch; and a third terminal of the eighth switch connected to the first bus terminal of the first inverter, the second switch, and the positive electrode of the first power battery, and the controller is configured to, in the second predetermined state, control the first switch and the fifth switch to be off and control the second switch and the sixth switch to be on, control a connection between the first terminal of the seventh switch and the second terminal of the seventh switch, and control a connection between the first terminal of the eighth switch and the third terminal of the eighth switch, so that an external power source charges the first power battery, the second power battery, the third power battery, and the fourth power battery.

[0014] Preferably, the controller is configured to control the conduction / cut-off of the first inverter, the second inverter, the third inverter and the fourth inverter in order to realize heating of the first power battery, the second power battery, the third power battery and the fourth power battery, in the first predetermined state, by charging / discharging the first power battery and the second power battery through the first energy processing device and the second energy processing device, and charging / discharging the third power battery and the fourth power battery through the fifth energy processing device and the sixth energy processing device, and when the first power battery charges the second power battery, the fourth power battery charges the third power battery, and when the second power battery charges the first power battery, the third power battery charges the fourth power battery.

[0015] Preferably, the first motor, the second motor, the third motor and the fourth motor are each a drive motor in a vehicle, and the controller is configured to control the first switch, the second switch, the fifth switch and the sixth switch to be off, control the connection between the first terminal of the seventh switch and the third terminal of the seventh switch, and control the connection between the first terminal and the second terminal of the eighth switch, so that, in a third predetermined state, the first power battery, the second power battery, the third power battery and the fourth power battery drive the vehicle using the first motor, the second motor, the third motor and the fourth motor, respectively.

[0016] Preferably, the first inverter, the second inverter, the fifth inverter and the sixth inverter each include three sets of bridge arms, the first motor, the second motor, the fifth motor and the sixth motor each are three-phase motors each including three motor windings, and in the first predetermined state, the currents in the three motor windings of each of the first motor, the second motor, the fifth motor and the sixth motor always point in the same direction.

[0017] Preferably, the controller is configured to, in the first predetermined state, direct heat generated by the first power battery and the second power battery to a passenger compartment of the vehicle using a heat pump to provide a heat source.

[0018] In addition, the battery self-heating method according to the present disclosure includes a step of controlling the conduction / cut-off of the first inverter and the second inverter so that, in a first predetermined state, the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device to realize heating of the first power battery and the second power battery, the first energy processing device includes a first inverter and a first motor, the second energy processing device includes a second inverter and a second motor, a first bus terminal of the first inverter is connected to the positive electrode of the first power battery, a second bus terminal of the first inverter is connected to the negative electrode of the first power battery, the negative electrode of the second power battery, and a second bus terminal of the second inverter, a first terminal of the first motor is connected to a midpoint of the first inverter, a first terminal of the second motor is connected to the midpoint of the second inverter, and a second terminal of the first motor is commonly connected to form a first neutral point, and is connected by a neutral wire to a second neutral point formed by commonly connecting the second terminals of the second motor.

[0019] Moreover, an electric vehicle according to the present disclosure includes the battery self-heating device as described above.

[0020] According to the above technical means, a battery self-heating device is provided that uses dual motors and dual electrical control systems to perform low-frequency vibration heating. This battery self-heating device makes full use of the characteristics of some electric vehicles, such as four-wheel drive electric vehicles, that have dual motors and dual electrical control systems. By connecting the dual motors through a neutral wire, the efficiency and power of the self-heating of the power battery can be greatly improved, while ensuring low costs.

[0021] Other features and advantages of the present disclosure are described in detail in the detailed description that follows. [Brief description of the drawings]

[0022] The drawings are intended to provide a further understanding of the present disclosure, are incorporated in and constitute a part of the specification, and are used to explain, but not to limit, the present disclosure in conjunction with the following specific embodiments.

[0023] [Figure 1] FIG. 1 is a schematic diagram of a battery self-heating device according to an exemplary embodiment of the present disclosure. [Diagram 2] FIG. 13 is a schematic configuration diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. [Diagram 3] FIG. 13 is a schematic configuration diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. [Figure 4] FIG. 13 is a schematic configuration diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. [Diagram 5] FIG. 13 is a schematic configuration diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. [Figure 6] FIG. 13 is a schematic configuration diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. [Figure 7] FIG. 13 is a schematic diagram of terminals of a seventh switch and an eighth switch in a battery self-heating device according to another exemplary embodiment of the present disclosure. [Figure 8] 1 is a flowchart of a battery self-heating method according to one exemplary embodiment of the present disclosure. [Figure 9] FIG. 2 is a structural block diagram of an electric vehicle according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining and interpreting the present disclosure, and are not intended to limit the present disclosure.

[0025] It should be noted that all operations involving signals, information or data captured in this disclosure are performed in compliance with the relevant data protection laws of the country in which they are located and with the permission of the owner of the relevant device.

[0026] 1 is a schematic diagram of a battery self-heating device according to an exemplary embodiment of the present disclosure. As shown in FIG. 1, the device includes a first energy processing device 10, a second energy processing device 20, and a controller (not shown) connected to each other, the first energy processing device 10 includes a first inverter 11 and a first motor 12, the second energy processing device 20 includes a second inverter 21 and a second motor 22, a first bus terminal of the first inverter 11 is connected to a positive pole of a first power battery 1, a second bus terminal of the first inverter 11 is connected to a negative pole of the first power battery 1, a negative pole of the second power battery 2, and a second bus terminal of the second inverter 21, a first terminal of the first motor 12 is connected to a midpoint of the first inverter 11, a first terminal of the second motor 22 connected to the midpoint of the second inverter 21, a second terminal of the first motor 12 connected in common to form a first neutral point 13, and connected by a neutral wire to a second neutral point 23 formed by commonly connecting the second terminals of the second motor 22, and the controller is configured to control the conduction / cut-off of the first inverter 11 and the second inverter 21 so that, in a first predetermined state, the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10 and the second energy processing device 20 to realize heating of the first power battery 1 and the second power battery 2.

[0027] The first power battery 1 and the second power battery 2 shown in FIG. 1 may both be power batteries in the same electric vehicle. The first energy processing device 10 and the second energy processing device 20 may both be components in the same electric vehicle, and the electric vehicle may include electric or hybrid vehicles, ships, airplanes, etc., and the following description will be mainly based on the example of a vehicle. For example, current four-wheel drive electric vehicles often use dual motors and dual electric control systems, in which case the first inverter 11 may be an inverter in a first motor controller in the vehicle, the first motor 12 may be a first motor controlled by the first motor controller in the vehicle, the second inverter 21 may be an inverter in a second motor controller in the vehicle, and the second motor 22 may be a second motor controlled by the second motor controller in the vehicle.

[0028] The first predetermined state may be a state in which the first power battery 1 and the second power battery 2 need to be heated, such as a state in which the electric power of the first power battery 1 and the second power battery 2 is lower than a predetermined electric power threshold, or a state in which the temperature of the first power battery 1 and the second power battery 2 is lower than a predetermined temperature threshold.

[0029] A controller controls the conduction / cutoff of the first inverter 11 and the second inverter 21 in the first predetermined state, so that an oscillating current is generated between the first power battery 1 and the second power battery 2 by the first energy processing device 10 and the second energy processing device 20, which causes them to charge / discharge each other and realize heating of the first power battery 1 and the second power battery 2. In this way, compared with a method of performing battery self-heating using only a single motor and a single electric control system in a vehicle, by incorporating both of the two motors and two electric control systems in a vehicle into the vibration heating process of the battery, the increased motors and electric control systems generate more heat in the self-heating process, and the generated heat is at least twice as much as the heat generated by the self-heating by the original single motor and single electric control system, so that the self-heating efficiency of the battery can be greatly improved. In addition, since the heat generated is significantly increased, if the heat generated by heating exceeds the heat required for the battery, the excess heat can be extracted by a heat pump to provide a heat source for the vehicle's passenger compartment, thereby reducing the energy consumed when heating the vehicle's passenger compartment; and since both the first energy processing device 10 and the second energy processing device 20 may be existing components within the vehicle, the components already present in the vehicle can be fully utilized to heat the vehicle's power battery, thereby saving costs.

[0030] The bridge arms in the first inverter 11 and the second inverter 21 may be three phases as shown in Fig. 1 or may be other numbers, which is merely an example in Fig. 1. The number of motor windings included in the first motor 12 and the second motor 22 corresponds to the number of bridge arms in the first inverter 11 and the second inverter 21, respectively.

[0031] 1, the bridge arms in the first inverter 11 and the second inverter 21 are three-phase bridge arms, and each of the first motor 12 and the second motor 22 includes three motor windings (L1, L2, L3, L4, L5, L6), the controller controls the upper bridge arm of the first inverter 11 and the lower bridge arm of the second inverter 21 to be simultaneously conductive in the first predetermined state, or controls the lower bridge arm of the first inverter 11 and the upper bridge arm of the second inverter 21 to be simultaneously conductive, thereby realizing the self-heating of the first power battery 1 and the second power battery 2. In the heating period, the current state in the first energy processing device 10 and the second energy processing device 20 may include the following four states:

[0032] In state 1, the three upper bridge arms (D1, D2, D3) in the first inverter 11 and the three lower bridge arms (E4, E5, E6) in the second inverter 21 are controlled to be conductive, and the three lower bridge arms (D4, D5, D6) in the first inverter 11 and the three upper bridge arms (E1, E2, E3) in the second inverter 21 are controlled to be disconnected, so that the first power battery 1 discharges to the outside, and the first motor 12 and the second motor 22 store energy. Current flows out from the positive electrode of the first power battery 1, passes through the three upper bridge arms (D1, D2, D3) in the first inverter 11, flows to the first motor 12, passes through the neutral wire between the first motor 12 and the second motor 22, flows out of the second motor 22, passes through the three lower bridge arms (E4, E5, E6) in the second inverter 21, and returns to the negative electrode of the first power battery 1.In this state, the first power battery 1 discharges, the first motor 12 and the second motor 22 charge, and the voltage of the first power battery 1 drops.

[0033] In state 2, the three lower bridge arms (D4, D5, D6) in the first inverter 11 and the three upper bridge arms (E1, E2, E3) in the second inverter 21 are controlled to be turned on, and the three upper bridge arms (D1, D2, D3) in the first inverter 11 and the three lower bridge arms (E4, E5, E6) in the second inverter 21 are controlled to be turned off. The current in the motor winding 20 cannot change suddenly, so the first motor 12 and the second motor 22 are refluxed, and the reflux current passes through the diodes connected in anti-parallel to the three upper bridge arms (E1, E2, E3) in the second inverter 21, flows to the positive pole of the second power battery 2, charges the second power battery 2, and the charging current then flows out from the negative pole of the second power battery 2, passes through the diodes connected in anti-parallel to the three lower bridge arms (D4, D5, D6) of the first inverter 11, and returns to the first motor 12 and the second motor 22. In this state, the first motor 12 and the second motor 22 discharge and the second power battery 2 charges, the first motor 12 and the second motor 22 release the electrical energy stored in the previous state, the electrical energy is transmitted to the second power battery 2, the voltage of the first motor 12 and the second motor 22 decreases, and the voltage of the second power battery 2 increases.

[0034] In state 3, the conductive / cut-off state of the first inverter 11 and the second inverter 21 does not change. In this case, the voltage of the second power battery 2 reaches the highest level, and the current flows out from the positive pole of the second power battery 2, passes through the three upper bridge arms (E1, E2, E3) in the second inverter 21, the second motor 22, the first motor 12, and the three lower bridge arms (D4, D5, D6) in the first inverter 11, and finally returns to the negative pole of the second power battery 2. In this state, the second power battery 2 discharges, its voltage decreases, and the discharged electric energy is stored in the first motor 12 and the second motor 22, and the first motor 12 and the second motor 22 charge, and their voltages increase.

[0035] In state 4, the three upper bridge arms (D1, D2, D3) in the first inverter 11 and the three lower bridge arms (E4, E5, E6) in the second inverter 21 are controlled to be turned on, and the three lower bridge arms (D4, D5, D6) in the first inverter 11 and the three upper bridge arms (E1, E2, E3) in the second inverter 21 are controlled to be cut off, so that the first motor 12 and the second motor 22 reflux, and the reflux current passes through the diodes connected in anti-parallel to the three upper bridge arms (D1, D2, D3) in the first inverter 11 to flow to the positive electrode of the first power battery 1 and charge the first power battery 1, and the charging current flows out from the negative electrode of the first power battery 1 to return to the first motor 12 and the second motor 22 through the diodes connected in anti-parallel to the three lower bridge arms (E4, E5, E6) in the second inverter 21. In this state, the first motor 12 and second motor 22 discharge, causing their voltages to drop, and the first power battery 1 charges, causing its voltage to rise.

[0036] In the above-mentioned battery self-heating process, the first power battery 1 and the second power battery 2 both undergo charging and discharging processes, so that the effect of self-heating can be achieved by either the first power battery 1 or the second power battery 2.

[0037] In addition, in a general circuit including a motor, in order to ensure that the sum of the currents entering the neutral point (point N) of the motor at any time is equal to the sum of the currents flowing out of the neutral point of the motor, the currents flowing through the motor must be in different directions, for example, one phase input and one phase output, one phase input and two phase output, or one phase output and two phase input, so the maximum current passing through a conventional motor is only the limited current of the motor winding of one phase. In the schematic diagram of the battery self-heating device shown in Figure 1, the first motor 12 and the second motor 22 can both draw current through the neutral wire connected between them, so that the currents in the three-phase motor windings in the first motor 12 and the second motor 22 can all be in the same direction, thereby greatly increasing the magnitude of the current that can pass through the first motor 12 and the second motor 22, and fully exerting the maximum overcurrent capability of the motor. The larger the current, the more heat is generated in the first power battery 1 and the second power battery 2, so that the efficiency of the battery self-heating achieved by this embodiment can be further improved.

[0038] In addition, when the bridge arms in the first inverter 11 and the second inverter 21 shown in FIG. 1 are three-phase bridge arms and the first motor 12 and the second motor 22 each include three motor windings, when the currents in the three motor windings included in the first motor 12 and the second motor 22 flow in the same direction, the magnitudes of the currents in the three motor windings are equal, and the electromagnetic force synthesized in the motor is always zero, further realizing zero torque output and ensuring the stationary motor during the battery self-heating process without any additional torque control.

[0039] According to the above technical means, a battery self-heating device is provided that uses dual motors and dual electrical control systems to perform low-frequency vibration heating. This battery self-heating device makes full use of the characteristics of some electric vehicles, such as four-wheel drive electric vehicles, that have dual motors and dual electrical control systems. By connecting the dual motors with a neutral wire, the efficiency and power of the self-heating of the power battery can be greatly improved, while ensuring low costs.

[0040] 2 is a schematic diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. As shown in FIG. 2, the device further includes a first switch K1, the first switch K1 is connected between the first neutral point 13 and the second neutral point 23, and when the first switch K1 is turned on, the first neutral point 13 and the second neutral point 23 are conductive, and the controller is configured to control the first switch K1 to be turned on in the first predetermined state. That is, in the first predetermined state, the first motor 12 and the second motor 22 are conductive, so that the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10 and the second energy processing device 20, thereby realizing heating of the first power battery 1 and the second power battery 2.

[0041] In one possible embodiment, as shown in Fig. 2, the device further includes a second switch K2, the second switch K2 is connected to the positive pole of the first power battery 1, the positive pole of the second power battery 2, the first bus terminal of the first inverter 11, and the first bus terminal of the second inverter 21, when the second switch K2 is turned on, the positive pole of the first power battery 1, the positive pole of the second power battery 2, the first bus terminal of the first inverter 11, and the first bus terminal of the second inverter 21 are conductive, and the controller is configured to control the first switch K1 to be off and control the second switch K2 to be on in a second predetermined state so that an external power source charges the first power battery 1 and the second power battery 2. The second predetermined state may be a state in which the first power battery 1 and the second power battery 2 need to be charged, for example, a state in which the vehicle is connected to an external charging station, or a state in which the power amounts of the first power battery 1 and the second power battery 2 are lower than the predetermined power amount threshold. In this case, the first power battery 1 and the second power battery 2 are charged as independent battery packs.

[0042] In one possible embodiment, the first motor 12 and the second motor 22 may be driving motors in a vehicle, in which case the controller is configured to control the first switch K1 and the second switch K2 to be off in a third predetermined state, so that the first power battery 1 and the second power battery 2 drive the vehicle by the first motor 12 and the second motor 22, respectively. The third predetermined state is a state in which the vehicle needs to run normally, and in this state, by controlling the first switch K1 and the second switch K2 to be off, each of the first motor 12 and the second motor 22 can complete the corresponding running driving function.

[0043] In addition, based on using the dual motor and dual electric control system to realize the vibration heating circuit to heat the battery in the vehicle, more motors and motor controllers can be added to the circuit to further enhance the self-heating effect of the battery. For example, Figures 3 and 4 below show two schematic configuration diagrams of the battery self-heating circuit that can be configured when there are two power batteries and three motors and three motor controllers in the vehicle.

[0044] 3 is a schematic diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. As shown in FIG. 3, the device further includes a third energy processing device 30 and a third switch K3, the third energy processing device 30 includes a third inverter 31 and a third motor 32, a first bus terminal of the third inverter 31 is connected to the positive pole of the second power battery 2, a first bus terminal of the second inverter 21 and the second switch K2, a second bus terminal of the third inverter 31 is connected to the negative pole of the first power battery 1, the negative pole of the second power battery 2, a second bus terminal of the first inverter 11 and a second bus terminal of the second inverter 21, a first terminal of the third motor 32 is connected to the midpoint of the third inverter 31, and a second terminal of the third motor 32 is connected to a common. A third neutral point 33 is formed, and the third neutral point 33 is connected to the first switch K1 and the second neutral point 23 via a third switch K3. The controller is configured to control the first switch K1 and the third switch K3 to be on, control the second switch K2 to be off, and control the conduction / cutoff of the first inverter 11, the second inverter 21 and the third inverter 31, so that in the first predetermined state, the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10, the second energy processing device 20 and the third energy processing device 30 to realize heating of the first power battery 1 and the second power battery 2.

[0045] In this embodiment, the third energy processing device 30 is connected to the second power battery 2 together with the second energy processing device. In the first predetermined state, the controller controls the first switch K1 and the third switch K3 to be on, and controls the second switch K2 to be off, thereby forming a battery self-heating device including the first energy processing device 10, the second energy processing device 20 and the third energy processing device 30, the direction and principle of the self-heating current of the battery self-heating device are the same as those described in the embodiment shown in Figure 1 above, the conduction / cutoff of the upper bridge arm and the lower bridge arm in the third energy processing device 30 coincides with the conduction / cutoff of the upper bridge arm and the lower bridge arm in the second energy processing device 20, the third energy processing device 30 and the second energy processing device 20 as a whole form a current circuit together with the first energy processing device 10, thereby realizing the charging / discharging of the first power battery 1 and the second power battery 2 in the above four states. In a second predetermined state, by turning off the first switch K1 and the third switch K3 and turning on the second switch K2, an external charging device, for example a charging station, can simultaneously charge each of the first power battery 1 and the second power battery 2. In a third predetermined state, by turning off the first switch K1, the second switch K2 and the third switch K3, the three motors in the first energy processing device 10, the second energy processing device 20 and the third energy processing device 30 can respectively drive the vehicle.

[0046] 4 is a schematic diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. As shown in FIG. 4, the device further includes a fourth energy processing device 40 and a fourth switch K4, the fourth energy processing device 40 includes a fourth inverter 41 and a fourth motor 42, a first bus terminal of the fourth inverter 41 is connected to the positive pole of the first power battery 1, the first bus terminal of the first inverter 11 and the second switch K2, a second bus terminal of the fourth inverter 41 is connected to the negative pole of the first power battery 1, the negative pole of the second power battery 2, the second bus terminal of the first inverter 11 and the second bus terminal of the second inverter 21, a first terminal of the fourth motor 42 is connected to the midpoint of the fourth inverter 41, and a second terminal of the fourth motor 42 is connected to a common terminal. A fourth neutral point 43 is formed, and the fourth neutral point 43 is connected to the first switch K1 and the first neutral point 13 via a fourth switch K4. The controller is configured to control the first switch K1 and the fourth switch K4 to be on, control the second switch K2 to be off, and control the conduction / cutoff of the first inverter 11, the second inverter 21 and the fourth inverter 41, so that in the first predetermined state, the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10, the second energy processing device 20 and the fourth energy processing device 40 to realize heating of the first power battery 1 and the second power battery 2.

[0047] In this embodiment, the fourth energy processing device 40 is connected to the first power battery 1 together with the first energy processing device 10. In the first predetermined state, the first switch K1 and the fourth switch K4 are controlled to be on, and the second switch K2 is controlled to be off, thereby forming a battery self-heating device including the first energy processing device 10, the second energy processing device 20 and the fourth energy processing device 40, the direction and principle of the self-heating current of the battery self-heating device are the same as those described in the embodiment shown in FIG. 1, the conduction / disconnection of the upper bridge arm and the lower bridge arm in the fourth energy processing device 40 coincides with the connection / disconnection of the upper bridge arm and the lower bridge arm in the first energy processing device 10, and the fourth energy processing device 40 and the first energy processing device 10 as a whole form a current circuit together with the second energy processing device 20, thereby realizing the charging / discharging of the first power battery 1 and the second power battery 2 in the above four states. In a second predetermined state, by turning off the first switch K1 and the fourth switch K4 and turning on the second switch K2, an external charging device, for example a charging station, can simultaneously charge each of the first power battery 1 and the second power battery 2. In a third predetermined state, by turning off the first switch K1, the second switch K2 and the fourth switch K4, the three motors in the first energy processing device 10, the second energy processing device 20 and the fourth energy processing device 40 can respectively drive the vehicle.

[0048] In one possible embodiment, the third inverter 31 and the fourth inverter 41 shown in Figures 3 and 4 may each include three sets of bridge arms, and the third motor 32 and the fourth motor 42 may each be a three-phase motor and each include three motor windings, and in the first predetermined state, the currents in the three motor windings of the third motor 32 and the fourth motor 42 also always point in the same direction. Thus, when the battery self-heating device shown in Figures 3 and 4 performs self-heating of the first power battery 1 and the second power battery 2 in the first predetermined state, the maximum overcurrent capacity of the third motor 32 and the fourth motor 42 can be fully exerted, more heat can be generated, and the self-heating efficiency of the battery can be further improved. In addition, when the third motor 32 and the fourth motor 42 each include three motor windings, when the currents point in the same direction, the magnitudes of the currents in the three motor windings in the motors are equal, and the electromagnetic force synthesized in the motors is always zero, and zero torque output can be realized, and the motor can be stationary during the battery self-heating process without any additional torque control.

[0049] In addition, based on using dual motors and dual electric control systems to realize a vibration heating circuit to heat the battery in the vehicle, more power batteries, motors and motor controllers can be used to further enhance the self-heating effect of the battery. For example, Figures 5 and 6 below show two schematic configuration diagrams of a battery self-heating circuit that can be configured when there are four power batteries, four motors and four motor controllers in the vehicle.

[0050] 5 is a schematic diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. As shown in FIG. 5, the device further includes a fifth energy processing device 50 and a sixth energy processing device 60, the fifth energy processing device 50 includes a fifth inverter 51 and a fifth motor 52, the sixth energy processing device 60 includes a sixth inverter 61 and a sixth motor 62, a first bus terminal of the fifth inverter 51 is connected to the negative pole of the first power battery 1, the negative pole of the second power battery 2, the positive pole of the third power battery 3, the positive pole of the fourth power battery 4, the second bus terminal of the first inverter 11, and the second bus terminal of the second inverter 21, a second bus terminal of the fifth inverter 51 is connected to the negative pole of the third power battery 3, the negative pole of the fourth power battery 4, and the second bus terminal of the sixth inverter 61, a first terminal of the fifth motor 52 is connected to the midpoint of the fifth inverter 51, and a first terminal of the sixth motor 62 is connected to the midpoint of the sixth inverter 61. a first terminal of the fifth motor 52 connected to a neutral point, a second terminal of the sixth motor 62 connected in common to form a fifth neutral point 53, and a sixth terminal of the sixth motor 62 connected in common to form a sixth neutral point 63; and the controller is configured to control the first switch K1 to be on, control the second switch K2 to be off, and control the conduction / cutoff of the first inverter 11, the second inverter 21, the fifth inverter 51 and the sixth inverter 61, so that the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4 are charged / discharged by the first energy processing device 10, the second energy processing device 20, the fifth energy processing device 50 and the sixth energy processing device 60 in the first predetermined state to realize heating of the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4.

[0051] In the first predetermined state, the method of realizing the battery self-heating in this embodiment is to control the conduction / cutoff of the first inverter 11, the second inverter 21, the third inverter 31 and the fourth inverter 41, so that the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10 and the second energy processing device 20, and the third power battery 3 and the fourth power battery 4 are charged / discharged by the fifth energy processing device 50 and the sixth energy processing device 60, thereby realizing the heating of the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4. That is, the first power battery 1 and the second power battery 2 are grouped into a charging / discharging group, and the third power battery 3 and the fourth power battery 4 are grouped into a charging / discharging group, and each of the power batteries in the group is configured with a self-heating device capable of self-heating. The direction and principle of the self-heating current in each group are the same as those described in the embodiment shown in FIG. 1, so that the description will be omitted here.

[0052] In addition, in this case, since the space inside the battery pack is small, there are multiple power batteries in the battery pack, and if the voltages between the multiple power batteries cannot be balanced, a certain potential difference occurs, resulting in the generation of current. Since the electrical resistance inside the battery pack is small, the current generated by the potential difference has a large effect on the battery pack, making it easy for the battery pack to burn out. Therefore, when charging / discharging multiple sets of power batteries, the power battery on one side is considered as a whole, and the overall voltage of the power batteries on each side is always kept stable, thereby avoiding the generation of potential differences. For example, in the schematic diagram shown in FIG. 5, when the first power battery 1 and the third power battery 3 are considered as a whole, and the second power battery 2 and the fourth power battery 4 are considered as a whole, and the charging / discharging of each power battery is controlled respectively, it is ensured that when the first power battery 1 charges the second power battery 2, the fourth power battery 4 charges the third power battery 3, and when the second power battery 2 charges the first power battery 1, the third power battery 3 charges the fourth power battery 4. This makes it possible to keep the total voltage between the first power battery 1 and the third power battery 3 and the total voltage between the second power battery 2 and the fourth power battery 4 stable, and reduces safety risks to the battery pack due to potential differences.

[0053] Based on the schematic configuration diagram of the battery self-heating device shown in FIG. 5, in order to further realize the functions of charging the battery pack and driving the motor, a schematic configuration diagram of the battery self-heating device shown in FIG. 6 is provided.

[0054] 6 is a schematic diagram of a battery self-heating device according to another exemplary embodiment of the present disclosure. As shown in FIG. 6, the device further includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and an eighth switch K8, the fifth switch K5 is connected between the fifth neutral point 53 and the sixth neutral point 63, when the fourth switch K4 is turned on, the fourth neutral point 43 and the fifth neutral point 53 are conductive, a first terminal of the sixth switch K6 is connected to a first bus terminal of the fifth inverter 51 and a first terminal of the eighth switch K8, a second terminal of the sixth switch K6 is connected to a first bus terminal of the sixth inverter 61, a second bus terminal of the second inverter 21, a second bus terminal of the first inverter 11, the negative pole of the second power battery 2, the negative pole of the fourth ... When the sixth switch K6 is turned on, the first and second terminals of the sixth switch K6 are conductive, and the second terminal of the seventh switch K7 is connected to the second bus terminal of the fifth inverter 51, the second bus terminal of the sixth inverter 61, the negative electrode of the third power battery 3, and the negative electrode of the fourth power battery 4; the third terminal of the seventh switch K7 is connected to the negative electrode of the first power battery 1, the positive electrode of the third power battery 3, and the second terminal of the eighth switch K8, and the third terminal of the eighth switch K8 is connected to the first bus terminal of the first inverter 11, the second switch K2, and the positive electrode of the first power battery 1.

[0055] The ordering of the terminals of the seventh switch K7 and the eighth switch K8 is as shown in FIG. 7, and is determined in clockwise order as the first terminal a, the second terminal b, and the third terminal c.

[0056] According to the schematic configuration diagram shown in FIG. 5, in the first predetermined state, the controller in FIG. 6 controls the first switch K1 and the fifth switch K5 to be on, controls the second switch K2 and the sixth switch K6 to be off, controls the connection between the first terminal of the seventh switch K7 and the third terminal of the seventh switch K7, and controls the connection between the first terminal of the eighth switch K8 and the second terminal of the eighth switch K8. In this way, by controlling the conduction / cutoff of the first inverter 11, the second inverter 21, the fifth inverter 51, and the sixth inverter 61, heating of the first power battery 1, the second power battery 2, the third power battery 3, and the fourth power battery 4 can be realized.

[0057] In addition, the controller in FIG. 6 is further configured to, in the second predetermined state, control the first switch K1 and the fifth switch K5 to be off, control the second switch K2 and the sixth switch K6 to be on, control the connection between the first terminal of the seventh switch K7 and the second terminal of the seventh switch K7, and control the connection between the first terminal of the eighth switch K8 and the third terminal of the eighth switch K8, so that an external power source charges the first power battery 1, the second power battery 2, the third power battery 3, and the fourth power battery 4.

[0058] In addition, when the first motor 12, the second motor 22, the third motor 32 and the fourth motor 42 shown in Figure 6 are driving motors in a vehicle, the controller in Figure 6 is further configured to control the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 to be off, control the connection between the first terminal of the seventh switch K7 and the third terminal of the seventh switch K7, and control the connection between the first terminal of the eighth switch K8 and the second terminal of the eighth switch K8, so that the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4 drive the vehicle using the first motor 12, the second motor 22, the third motor 32 and the fourth motor 42, respectively, in a third predetermined state.

[0059] In one possible embodiment, the fifth inverter 51 and the sixth inverter 61 shown in Figures 5 and 6 may each include three sets of bridge arms, and the fifth motor 52 and the sixth motor 62 may each be a three-phase motor and each include three motor windings, and in the first predetermined state, the currents in the three motor windings of the fifth motor 52 and the sixth motor 62 also always point in the same direction. Thus, when the battery self-heating device shown in Figures 5 and 6 performs self-heating of the first power battery 1 and the second power battery 2 in the first predetermined state, the maximum overcurrent capacity of the fifth motor 52 and the sixth motor 62 can be fully exerted, more heat can be generated, and the self-heating efficiency of the battery can be further improved. In addition, when the fifth motor 52 and the sixth motor 62 each include three motor windings, when the currents point in the same direction, the magnitudes of the currents in the three motor windings in the motors are equal, and the electromagnetic force synthesized in the motor is always zero, and zero torque output can be realized, and the motor can be stationary during the battery self-heating process without any additional torque control.

[0060] 8 is a flow chart of a battery self-heating method according to an exemplary embodiment of the present disclosure. As shown in FIG. 8, the method includes step 801.

[0061] In step 801, in a first predetermined state, the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10 and the second energy processing device 20, and the first inverter 11 and the second inverter 21 are controlled to be turned on / off in order to realize heating of the first power battery 1 and the second power battery 2. The first energy processing device 10 includes a first inverter 11 and a first motor 12, and the second energy processing device 20 includes a second inverter 21 and a second motor 22, a first bus terminal of the first inverter 11 is connected to the positive electrode of the first power battery 1, a second bus terminal of the first inverter 11 is connected to the negative electrode of the first power battery 1, the negative electrode of the second power battery 2 and a second bus terminal of the second inverter 21, a first terminal of the first motor 12 is connected to the midpoint of the first inverter 11, a first terminal of the second motor 22 is connected to the midpoint of the second inverter 21, and second terminals of the first motor 12 are commonly connected to form a first neutral point 13 and are connected by a neutral wire to a second neutral point 23 formed by commonly connecting the second terminals of the second motor 22.

[0062] According to the above technical means, a battery self-heating device is provided that uses dual motors and dual electrical control systems to perform low-frequency vibration heating. This battery self-heating device makes full use of the characteristics of some electric vehicles, such as four-wheel drive electric vehicles, that have dual motors and dual electrical control systems. By connecting the dual motors with a neutral wire, the efficiency and power of the self-heating of the power battery can be greatly improved, while ensuring low costs.

[0063] In one possible embodiment, the method further includes a step of controlling a first switch K1 to be on in the first predetermined state, the first switch K1 being connected between the first neutral point 13 and the second neutral point 23, and when the first switch K1 is on, the first neutral point 13 and the second neutral point 23 are conductive.

[0064] In one possible embodiment, the method further includes a step of controlling the first switch K1 to be off and controlling the second switch K2 to be on in a second predetermined state so that an external power source charges the first power battery 1 and the second power battery 2, the second switch K2 being connected to the positive electrode of the first power battery 1, the positive electrode of the second power battery 2, the first bus terminal of the first inverter 11 and the first bus terminal of the second inverter 21, and when the second switch K2 is turned on, the positive electrode of the first power battery 1, the positive electrode of the second power battery 2, the first bus terminal of the first inverter 11 and the first bus terminal of the second inverter 21 are conductive.

[0065] In one possible embodiment, the method further includes the step of controlling the upper bridge arm of the first inverter 11 and the lower bridge arm of the second inverter 21 to be simultaneously conductive, or controlling the lower bridge arm of the first inverter 11 and the upper bridge arm of the second inverter 21 to be simultaneously conductive, so that in the first predetermined state, the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10 and the second energy processing device 20 to realize heating of the first power battery 1 and the second power battery 2.

[0066] In one possible embodiment, the method further includes the steps of controlling the first switch K1 and the third switch K3 to be on, turning off the second switch K2, and controlling the first inverter 11, the second inverter 21, and the third inverter 31 to be turned on / off, so as to realize heating of the first power battery 1 and the second power battery 2 by the first energy processing device 10, the second energy processing device 20, and the third energy processing device 30 in the first predetermined state, and the third energy processing device 30 controls the third inverter 31 and the third motor 32 to be turned on / off. a first bus terminal of the third inverter 31 is connected to the positive electrode of the second power battery 2, the first bus terminal of the second inverter 21 and the second switch K2; a second bus terminal of the third inverter 31 is connected to the negative electrode of the first power battery 1, the negative electrode of the second power battery 2, the second bus terminal of the first inverter 11 and the second bus terminal of the second inverter 21; a first terminal of the third motor 32 is connected to the midpoint of the third inverter 31, and second terminals of the third motor 32 are commonly connected to form a third neutral point 33, and the third neutral point 33 is connected to the first switch K1 and the second neutral point 23 via the third switch K3.

[0067] In one possible embodiment, the method further includes the steps of controlling the first switch K1 and the fourth switch K4 to be on, turning off the second switch K2, and controlling the first inverter 11, the second inverter 21, and the fourth inverter 41 to be turned on / off, so that the first power battery 1 and the second power battery 2 are charged / discharged by the first energy processing device 10, the second energy processing device 20, and the fourth energy processing device 40 in the first predetermined state, thereby realizing heating of the first power battery 1 and the second power battery 2; the fourth energy processing device 40 controls the fourth inverter 41 and the fourth motor 42 to be turned on / off; a first bus terminal of the fourth inverter 41 is connected to the positive electrode of the first power battery 1, a first bus terminal of the first inverter 11 and the second switch K2, a second bus terminal of the fourth inverter 41 is connected to the negative electrode of the first power battery 1, the negative electrode of the second power battery 2, a second bus terminal of the first inverter 11 and a second bus terminal of the second inverter 21, a first terminal of the fourth motor 42 is connected to the midpoint of the fourth inverter 41, and second terminals of the fourth motor 42 are commonly connected to form a fourth neutral point 43, and the fourth neutral point 43 is connected to the first switch K1 and the first neutral point 13 via the fourth switch K4.

[0068] In one possible embodiment, the method further includes the steps of controlling the first switch K1 to be on, controlling the second switch K2 to be off, and controlling the first inverter 11, the second inverter 21, the fifth inverter 51 and the sixth inverter 61 to be turned on / off, so as to realize heating of the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4 by the first energy processing device 10, the second energy processing device 20, the fifth energy processing device 50 and the sixth energy processing device 60 in the first predetermined state, wherein the fifth energy processing device 50 includes a fifth inverter 51 and a fifth motor 52, and the sixth energy processing device 60 includes a fifth motor 53 and a fifth inverter 54. , a sixth inverter 61 and a sixth motor 62, a first bus terminal of the fifth inverter 51 is connected to the negative electrode of the first power battery 1, the negative electrode of the second power battery 2, the positive electrode of the third power battery 3, the positive electrode of the fourth power battery 4, the second bus terminal of the first inverter 11 and the second bus terminal of the second inverter 21, a second bus terminal of the fifth inverter 51 is connected to the negative electrode of the third power battery 3, the negative electrode of the fourth power battery 4 and the second bus terminal of the sixth inverter 61, a first terminal of the fifth motor 52 is connected to the midpoint of the fifth inverter 51, a first terminal of the sixth motor 62 is connected to the midpoint of the sixth inverter 61, and second terminals of the fifth motor 52 are commonly connected to form a fifth neutral point 53, and are connected to a sixth neutral point 63 formed by commonly connecting the second terminals of the sixth motor 62.

[0069] In one possible embodiment, the method further includes the steps of controlling the first switch K1 and the fifth switch K5 to be off, controlling the second switch K2 and the sixth switch K6 to be on, controlling a connection between a first terminal of the seventh switch K7 and a second terminal of the seventh switch K7, and controlling a connection between a first terminal of the eighth switch K8 and a third terminal of the eighth switch K8, in order for an external power source to charge the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4 in the second predetermined state, the fifth switch K5 being connected between the fifth neutral point 53 and the sixth neutral point 63, when the fourth switch K4 is turned on, the fourth neutral point 43 and the fifth neutral point 53 are conductive, the first terminal of the sixth switch K6 is connected to a first bus terminal of the fifth inverter 51 and a first terminal of the eighth switch K8, A second terminal of the switch K6 is connected to the first bus terminal of the sixth inverter 61, the second bus terminal of the second inverter 21, the second bus terminal of the first inverter 11, the negative electrode of the second power battery 2, the positive electrode of the fourth power battery 4, and the first terminal of the seventh switch K7. When the sixth switch K6 is turned on, the first and second terminals of the sixth switch K6 are conductive, and the second terminal of the seventh switch K7 is connected to the second bus terminal of the fifth inverter 51, the second bus terminal of the sixth inverter 61, the negative electrode of the third power battery 3, and the negative electrode of the fourth power battery 4. A third terminal of the seventh switch K7 is connected to the negative electrode of the first power battery 1, the positive electrode of the third power battery 3, and the second terminal of the eighth switch K8. A third terminal of the eighth switch K8 is connected to the first bus terminal of the first inverter 11, the second switch K2, and the positive electrode of the first power battery 1.

[0070] In one possible embodiment, the method further includes a step of controlling the conduction / cutoff of the first inverter 11, the second inverter 21, the third inverter 31 and the fourth inverter 41 to realize heating of the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4, in the first predetermined state, by the first power battery 1 and the second power battery 2 being charged / discharged by the first energy processing device 10 and the second energy processing device 20, and the third power battery 3 and the fourth power battery 4 being charged / discharged by the fifth energy processing device 50 and the sixth energy processing device 60, and when the first power battery 1 charges the second power battery 2, the fourth power battery 4 charges the third power battery 3, and when the second power battery 2 charges the first power battery 1, the third power battery 3 charges the fourth power battery 4.

[0071] In one possible embodiment, the method further includes the steps of controlling the first switch K1, the second switch K2, the fifth switch K5 and the sixth switch K6 to be off, controlling a connection between a first terminal of the seventh switch K7 and a third terminal of the seventh switch K7, and controlling a connection between a first terminal of the eighth switch K8 and the second terminal, so that, in a third predetermined state, the first power battery 1, the second power battery 2, the third power battery 3 and the fourth power battery 4 drive a vehicle by the first motor 12, the second motor 22, the third motor 32 and the fourth motor 42, respectively, and the first motor 12, the second motor 22, the third motor 32 and the fourth motor 42 are driving motors in the vehicle, respectively.

[0072] In one possible embodiment, the first inverter 11, the second inverter 21, the fifth inverter 51 and the sixth inverter 61 each include three sets of bridge arms, the first motor 12, the second motor 22, the fifth motor 52 and the sixth motor 62 each are three-phase motors and each include three motor windings, and in the first predetermined state, the currents in the three motor windings of each of the first motor 12, the second motor 22, the fifth motor 52 and the sixth motor 62 always point in the same direction.

[0073] In one possible embodiment, the method further includes, in the first predetermined state, conducting heat generated by the first power battery and the second power battery to a passenger compartment of the vehicle using a heat pump to provide a heat source.

[0074] Fig. 9 is a structural block diagram of an electric vehicle 900 according to an exemplary embodiment, as shown in Fig. 9, the electric vehicle 900 includes the above-mentioned battery self-heating device 100. A controller in the battery self-heating device 100 further executes all or part of the steps of the above-mentioned battery self-heating method. As can be understood by those skilled in the art, in a specific implementation, the vehicle 900 further includes other components, and Fig. 9 only shows parts related to the embodiment of the present disclosure, and other necessary vehicle components are not shown one by one.

[0075] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the drawings, the present disclosure is not limited to the specific contents of the above embodiments, and several simple modifications can be made to the technical means of the present disclosure within the scope of the technical idea of ​​the present disclosure, and all of these simple modifications fall within the scope of protection of the present disclosure.

[0076] It should be noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner if not contradictory, and in order to avoid unnecessary duplication, the present disclosure does not separately describe every possible combination manner.

[0077] Furthermore, the various embodiments of the present disclosure can be combined in any manner and should be considered as being disclosed in the present disclosure unless they deviate from the spirit of the present disclosure. [Explanation of symbols]

[0078] 1 1st power battery 2 2nd power battery 3 Third power battery 4 4th power battery 10 First energy processing device 20 Second Energy Processing Unit 30 Third Energy Processing Unit 40 4th Energy Processing Unit 50 5th Energy Processing Unit 60 6th Energy Processing Unit 11 First inverter 21 Second inverter 31 3rd inverter 41 4th inverter 51 5th inverter 61 6th inverter 12 First motor 22 Second motor 32 3rd motor 42 4th motor 52 5th motor 62 6th motor 13 1st neutral point 23 Second neutral point 33 Third neutral point 43 4th neutral point 53 5th neutral point 63 6th neutral point K1 First switch K2 Second switch K3 3rd switch K4 4th switch K5 5th switch K6 6th switch K7 7th switch K8 8th switch 100 Battery self-heating device 900 vehicles

Claims

1. A battery self-heating device including a first energy processing device (10), a second energy processing device (20) and a controller connected to each other, The first energy processing device includes a first inverter (11) and a first motor (12), and the second energy processing device includes a second inverter (21) and a second motor (22), a first bus terminal of the first inverter is connected to a positive electrode of a first power battery (1), and a second bus terminal of the first inverter is connected to a negative electrode of the first power battery, a negative electrode of a second power battery (2), and a second bus terminal of the second inverter; A first terminal of the first motor is connected to a midpoint of the first inverter, a first terminal of the second motor is connected to a midpoint of the second inverter, and second terminals of the first motor are commonly connected to form a first neutral point (13) and are connected by a neutral conductor to a second neutral point (23) formed by commonly connecting the second terminals of the second motors; The battery self-heating device is characterized in that the controller is configured to control the conduction / cut-off of the first inverter and the second inverter in a first predetermined state, and the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device to realize heating of the first power battery and the second power battery.

2. further comprising a first switch; The first switch is connected between the first neutral point and the second neutral point, and when the first switch is turned on, the first neutral point and the second neutral point are conductive, 2. The apparatus of claim 1, wherein the controller is configured to control the first switch to be on in the first predetermined state.

3. Further comprising a second switch; the second switch is connected to the positive terminal of the first power battery, the positive terminal of the second power battery, a first bus terminal of the first inverter, and a first bus terminal of the second inverter, and when the second switch is turned on, the positive terminal of the first power battery, the positive terminal of the second power battery, the first bus terminal of the first inverter, and the first bus terminal of the second inverter are conductive; 3. The device of claim 1 or 2, wherein the controller is configured to control the first switch to be off and the second switch to be on such that, in a second predetermined state, an external power source charges the first power battery and the second power battery.

4. The device according to any one of claims 1 to 3, characterized in that, in the first predetermined state, the controller is configured to control the upper bridge arm of the first inverter and the lower bridge arm of the second inverter to be simultaneously conductive, or to control the lower bridge arm of the first inverter and the upper bridge arm of the second inverter to be simultaneously conductive, and the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device to realize heating of the first power battery and the second power battery.

5. further comprising a third energy processor (30) and a third switch; The third energy processing device includes a third inverter (31) and a third motor (32), a first bus terminal of the third inverter is connected to the positive terminal of the second power battery, the first bus terminal of the second inverter and the second switch, and a second bus terminal of the third inverter is connected to the negative terminal of the first power battery, the negative terminal of the second power battery, the second bus terminal of the first inverter and the second bus terminal of the second inverter; A first terminal of the third motor is connected to a midpoint of the third inverter, and second terminals of the third motor are commonly connected to form a third neutral point (33), and the third neutral point is connected to the first switch and the second neutral point via a third switch; The device according to any one of claims 1 to 4, characterized in that, in the first predetermined state, the controller is configured to control the first switch and the third switch to be on, control the second switch to be off, and control the first inverter, the second inverter and the third inverter to be turned on / off, so that the first power battery and the second power battery are charged / discharged by the first energy processing device, the second energy processing device and the third energy processing device, thereby realizing heating of the first power battery and the second power battery.

6. Further comprising a fourth energy processing device (40) and a fourth switch; The fourth energy processing device includes a fourth inverter (41) and a fourth motor (42), a first bus terminal of the fourth inverter is connected to the positive terminal of the first power battery, the first bus terminal of the first inverter, and the second switch, and a second bus terminal of the fourth inverter is connected to the negative terminal of the first power battery, the negative terminal of the second power battery, the second bus terminal of the first inverter, and the second bus terminal of the second inverter; A first terminal of the fourth motor is connected to a midpoint of the fourth inverter, and second terminals of the fourth motor are commonly connected to form a fourth neutral point (43), and the fourth neutral point is connected to the first switch and the first neutral point via a fourth switch; The device according to any one of claims 1 to 5, wherein the controller is configured to, in the first predetermined state, control the first switch and the fourth switch to be on, control the second switch to be off, and control the first inverter, the second inverter and the fourth inverter to be turned on / off, so that the first power battery and the second power battery are charged / discharged by the first energy processing device, the second energy processing device and the fourth energy processing device, thereby realizing heating of the first power battery and the second power battery.

7. Further comprising a fifth energy processor (50) and a sixth energy processor (60); The fifth energy processing device includes a fifth inverter (51) and a fifth motor (52), and the sixth energy processing device includes a sixth inverter (61) and a sixth motor (62); a first bus terminal of the fifth inverter is connected to the negative electrode of the first power battery, the negative electrode of the second power battery, the positive electrode of the third power battery, the positive electrode of the fourth power battery, a second bus terminal of the first inverter, and a second bus terminal of the second inverter; and a second bus terminal of the fifth inverter is connected to the negative electrode of the third power battery, the negative electrode of the fourth power battery, and a second bus terminal of the sixth inverter; A first terminal of the fifth motor is connected to a midpoint of the fifth inverter, a first terminal of the sixth motor is connected to a midpoint of the sixth inverter, and second terminals of the fifth motor are commonly connected to form a fifth neutral point (53) and are connected to a sixth neutral point (63) formed by commonly connecting second terminals of the sixth motors, The device according to any one of claims 1 to 6, characterized in that, in the first predetermined state, the controller is configured to control the first switch to be on, control the second switch to be off, and control the first inverter, the second inverter, the fifth inverter and the sixth inverter to be turned on / off, so that the first power battery, the second power battery, the third power battery and the fourth power battery are charged / discharged by the first energy processing device, the second energy processing device, the fifth energy processing device and the sixth energy processing device, thereby realizing heating of the first power battery, the second power battery, the third power battery and the fourth power battery.

8. further including a fifth switch, a sixth switch, a seventh switch and an eighth switch; The fifth switch is connected between the fifth neutral point and the sixth neutral point, and when the fourth switch is turned on, the fourth neutral point and the fifth neutral point are conductive, a first terminal of the sixth switch is connected to a first bus terminal of the fifth inverter and a first terminal of the eighth switch, a second terminal of the sixth switch is connected to a first bus terminal of the sixth inverter, a second bus terminal of the second inverter, a second bus terminal of the first inverter, a negative electrode of the second power battery, a positive electrode of the fourth power battery, and a first terminal of the seventh switch; when the sixth switch is turned on, the first terminal and the second terminal of the sixth switch are conductive; a second terminal of the seventh switch is connected to a second bus terminal of the fifth inverter, a second bus terminal of the sixth inverter, a negative pole of the third power battery, and a negative pole of the fourth power battery; a third terminal of the seventh switch is connected to a negative pole of the first power battery, a positive pole of the third power battery, and a second terminal of the eighth switch; a third terminal of the eighth switch is connected to a first bus terminal of the first inverter, the second switch, and a positive electrode of the first power battery; 8. The device of claim 7, wherein the controller is configured, in the second predetermined state, to control the first switch and the fifth switch to be off, control the second switch and the sixth switch to be on, control a connection between a first terminal of the seventh switch and a second terminal of the seventh switch, and control a connection between a first terminal of the eighth switch and a third terminal of the eighth switch, and an external power source to charge the first power battery, the second power battery, the third power battery, and the fourth power battery.

9. the controller is configured to control, in the first predetermined state, the conduction / cutoff of the first inverter, the second inverter, the third inverter, and the fourth inverter, the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device, and the third power battery and the fourth power battery are charged / discharged by the fifth energy processing device and the sixth energy processing device, thereby realizing heating of the first power battery, the second power battery, the third power battery, and the fourth power battery; 9. The apparatus of claim 8, wherein when the first power battery charges the second power battery, the fourth power battery charges the third power battery, and when the second power battery charges the first power battery, the third power battery charges the fourth power battery.

10. the first motor, the second motor, the third motor, and the fourth motor are each a drive motor in a vehicle, 9. The device of claim 8, wherein the controller, in a third predetermined state, controls the first switch, the second switch, the fifth switch, and the sixth switch to be off, controls a connection between a first terminal of the seventh switch and a third terminal of the seventh switch, and controls a connection between a first terminal of the eighth switch and the second terminal, so that the first power battery, the second power battery, the third power battery, and the fourth power battery are configured to drive a vehicle by the first motor, the second motor, the third motor, and the fourth motor, respectively.

11. 9. The apparatus of claim 8, wherein the first inverter, the second inverter, the fifth inverter, and the sixth inverter each include three sets of bridge arms, the first motor, the second motor, the fifth motor, and the sixth motor each are three-phase motors each including three motor windings, and in the first predetermined state, the currents in the three motor windings of each of the first motor, the second motor, the third motor, and the fourth motor always point in the same direction.

12. 12. The apparatus of claim 1, wherein the controller is configured to, in the first predetermined state, use heat generated by the first power battery and the second power battery as a heat source for a heat pump to provide heat to a passenger compartment of the vehicle.

13. In a first predetermined state, the first power battery and the second power battery are charged / discharged by the first energy processing device and the second energy processing device, and the first inverter and the second inverter are controlled to be turned on / off so as to realize heating of the first power battery and the second power battery; a first bus terminal of the first inverter connected to a positive electrode of a first power battery, a second bus terminal of the first inverter connected to a negative electrode of the first power battery, a negative electrode of the second power battery, and a second bus terminal of the second inverter, a first terminal of the first motor connected to a midpoint of the first inverter, a first terminal of the second motor connected to a midpoint of the second inverter, and second terminals of the first motor connected in common to form a first neutral point and connected by a neutral wire to a second neutral point formed by commonly connecting the second terminals of the second motor.

14. An electric vehicle comprising the battery self-heating device according to any one of claims 1 to 12.

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