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

Abstract

The invention discloses a battery self-heating device, a battery self-heating method, electric equipment and a vehicle. The battery self-heating device comprises a first battery, a second battery, a first motor system and a second motor system, the negative electrode of the first battery is connected with the positive electrode of the second battery, the first motor system is connected with the positive electrode of the first battery and the negative electrode of the second battery, and a first neutral line of the first motor system is connected with the second motor system. And a second neutral line of the second motor system is connected with a series connection point of the first battery and the second battery, so that the first battery and the second battery can be mutually charged through the first motor system and the second motor system. In the mutual charging process of the first battery and the second battery, self-heating of the first battery and the second battery can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of power battery self-heating, and in particular to a battery self-heating device, a battery self-heating method, an electrical device and a vehicle. Background Art

[0002] When battery components are in a low temperature environment, the activity of the electrochemical substances in the battery components is low. If the battery temperature is too low, its cycle life and performance will deteriorate. At low temperatures, the battery capacity may irreversibly decay, and even short circuit may occur.

[0003] At present, in order to solve the problem of low-temperature performance degradation of power batteries, an external heating method is generally used. The power battery is heated by adding a special electric heating system to the power battery, such as an electric heater or a liquid heater. Heat is applied to the battery from the outside to increase its temperature to meet performance requirements. However, this method cannot achieve satisfactory results because the battery energy consumed to generate this additional heat is relatively high compared to the small increase in the internal temperature of the battery, thereby significantly reducing the energy utilization of the vehicle. Summary of the invention

[0004] The embodiments of the present application provide a battery self-heating device, a battery self-heating method, an electrical device and a vehicle with high heating efficiency.

[0005] In a first aspect, the present application provides a battery self-heating device, which includes a first battery, a second battery, a first motor system, and a second motor system;

[0006] The negative electrode of the first battery is connected to the positive electrode of the second battery, the first motor system is connected to the positive electrode of the first battery and the negative electrode of the second battery respectively, the first neutral line of the first motor system is connected to the second motor system, and the second neutral line of the second motor system is connected to the series connection point of the first battery and the second battery, so that the first battery and the second battery can be charged by each other through the first motor system and the second motor system.

[0007] In combination with the first aspect, in a possible implementation, the battery self-heating device also includes a controller, which is configured to control the first battery to charge the second battery through the first motor system and the second motor system, or control the second battery to charge the first battery through the first motor system and the second motor system in a first preset state, so as to achieve heating of the first battery and the second battery.

[0008] In combination with the first aspect, in a possible implementation, the first motor system includes a first switch connected between the first neutral line and the second motor system; and the controller is configured to control the first switch to be closed in the first preset state.

[0009] In combination with the first aspect, in a possible implementation, the first motor system also includes a first motor and a first inverter, the first bus end of the first inverter is connected to the positive electrode of the first battery, the second bus end of the first inverter is connected to the negative electrode of the second battery, and the midpoint of the first inverter is connected to the first motor.

[0010] In combination with the first aspect, in a possible implementation, there are multiple first motor systems, and the multiple first motor systems are connected in parallel to the positive electrode of the first battery and the negative electrode of the second battery, and the first neutral line of the first motor in each of the first motor systems is connected to the second motor system through the first switch.

[0011] In combination with the first aspect, in one possible implementation, the second motor system includes a second switch connected between the second neutral line and the series connection point of the first battery and the second battery; the controller is configured to control the first switch and the second switch to be closed in the first preset state.

[0012] In combination with the first aspect, in a possible implementation, the second motor system further includes a second motor and a second inverter, the first bus terminal of the second inverter is connected to the first neutral line, and the midpoint of the second inverter is connected to the second motor.

[0013] In combination with the first aspect, in a possible implementation, the first bus end of the second inverter is connected to the first bus end of the first inverter, and a third switch is provided between the first bus end of the second inverter and the first bus end of the first inverter; the second bus end of the second inverter is connected to the second bus end of the first inverter, and a fourth switch is provided between the second bus end of the second inverter and the second bus end of the first inverter.

[0014] In combination with the first aspect, in a possible implementation, there are multiple second motor systems, and the multiple second motor systems are connected in parallel to the first bus end of the first inverter and the second bus end of the first inverter, and the first neutral line of the first motor in the first motor system is connected to the second motor system through the first switch.

[0015] In combination with the first aspect, in a possible implementation, there are multiple second motor systems, and the multiple second motor systems are connected in sequence, the second neutral line of the second motor in one second motor system is connected to the first bus terminal of the second inverter in the next second motor system through the second switch, and the second neutral line of the second motor in the last second motor system is connected to the series connection point of the first battery and the second battery through the second switch.

[0016] In combination with the first aspect, in a possible implementation manner, the controller is configured to control the first switch and the second switch to be closed, and control the third switch and the fourth switch to be opened in the first preset state.

[0017] In combination with the first aspect, in a possible implementation, the controller is configured to control the first switch and the second switch to be disconnected, and control the third switch and the fourth switch to be closed in a second preset state, so as to enable the first motor system and the second motor system to drive the vehicle.

[0018] In combination with the first aspect, in a possible implementation manner, the first bus terminals of two adjacent second inverters are connected through a fifth switch, and the second bus terminals of two adjacent second inverters are connected through a sixth switch.

[0019] In combination with the first aspect, in a possible implementation, the controller is configured to control the first switch and the second switch to be closed, and control the third switch, the fourth switch, the fifth switch, and the sixth switch to be opened in the first preset state.

[0020] In combination with the first aspect, in a possible implementation, in a second preset state, the first switch and the second switch are controlled to be disconnected, and the third switch, the fourth switch, the fifth switch and the sixth switch are controlled to be closed; or the first switch, the second switch, the fifth switch and the sixth switch are controlled to be disconnected, and the third switch and the fourth switch, the fifth switch and the sixth switch are controlled to be closed, so as to enable the first motor system and at least part of the second motor system to drive the vehicle.

[0021] In combination with the first aspect, in a possible implementation, the controller is configured to control at least one upper bridge arm of the first inverter and at least one upper bridge arm of the second inverter to be turned on at the same time, or to control at least one lower bridge arm of the first inverter and at least one upper bridge arm of the second inverter to be turned on at the same time in the first preset state, so that the first battery and the second battery can charge each other through the first motor system and the second motor system.

[0022] In combination with the first aspect, in a possible implementation manner, the first preset state includes a first stage and a second stage. In the first stage, at least one upper bridge arm of the first inverter and at least one upper bridge arm of the second inverter are turned on, the lower bridge arm of the first inverter and the lower bridge arm of the second inverter are both disconnected, and the positive electrode of the first battery, the turned-on upper bridge arm of the first inverter, the first motor, the turned-on upper bridge arm of the second inverter, the second motor, and the negative electrode of the first battery form a first charging circuit;

[0023] In the second stage, at least one lower bridge arm of the first inverter and at least one upper bridge arm of the second inverter are turned on, the upper bridge arm of the first inverter and the lower bridge arm of the second inverter are both disconnected, and the positive electrode of the second battery, the second motor, the turned-on upper bridge arm of the second inverter, the first motor, the turned-on lower bridge arm of the first inverter and the negative electrode of the second battery form a second charging circuit.

[0024] In combination with the first aspect, in a possible implementation, the controller is configured to control the number of the first motor and / or the second motor in the first charging circuit, and control the number of the first motor and / or the second motor in the second charging circuit.

[0025] In combination with the first aspect, in a possible implementation manner, the controller is configured to, when the temperature of the first battery and the temperature of the second battery meet a first preset condition, control the first motor system and the second motor system to enter the first preset state;

[0026] When the temperature of the first battery or the temperature of the second battery meets a second preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

[0027] In combination with the first aspect, in a possible implementation, when the temperature of the first battery is lower than a first preset value and the temperature of the second battery is lower than a second preset value, the controller is configured to control the battery self-heating device to enter the first preset state;

[0028] When the temperature of the first battery is greater than or equal to a third preset value, or the temperature of the second battery is greater than or equal to a fourth preset value, the controller is configured to control the battery self-heating device to exit the first preset state; wherein the third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

[0029] In combination with the first aspect, in a possible implementation manner, the controller is configured to, when the temperature of the first battery and the temperature of the second battery meet a first preset condition, and the temperature of the first motor and the temperature of the second motor meet a third preset condition, control the first motor system and the second motor system to enter the first preset state;

[0030] When the temperature of the first battery or the temperature of the second battery meets a second preset condition, or the temperature of the first motor and the temperature of the second motor meet a fourth preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

[0031] In combination with the first aspect, in a possible implementation, when the temperature of the first motor is lower than a fifth preset value and the temperature of the second motor is lower than a sixth preset value, the controller is configured to control the battery self-heating device to enter the first preset state;

[0032] When the temperature of the first motor is greater than or equal to a seventh preset value, or the temperature of the second motor is greater than or equal to an eighth preset value, the controller is configured to control the battery self-heating device to exit the first preset state; wherein the seventh preset value is greater than or equal to the fifth preset value, and the eighth preset value is greater than or equal to the sixth preset value.

[0033] In combination with the first aspect, in a possible implementation, the controller is configured to, in the first preset state, conduct heat generated by the first battery and the second battery to the vehicle passenger compartment through a pump to provide a heat source.

[0034] In combination with the first aspect, in a possible implementation, the battery self-heating device further includes a capacitor, and two ends of the capacitor are respectively connected to the positive electrode of the first battery and the negative electrode of the second battery.

[0035] In a second aspect, the present application provides a battery self-heating method, which is applied to the battery self-heating device as described in the first aspect.

[0036] In combination with the second aspect, in a possible implementation manner, the battery self-heating device includes a first preset state, and the first preset state is a self-heating state;

[0037] The battery self-heating method comprises:

[0038] In the first preset state, the first battery and the first motor system and the second motor system form a first power-on circuit, or the second battery and the second motor system and the first motor system form a second power-on circuit, so that the first battery and the second battery can be charged through the first motor system and the second motor system to achieve heating of the first battery and the second battery.

[0039] In combination with the second aspect, in a possible implementation manner, the battery self-heating device further includes a second preset state, and the second preset state is a driving state;

[0040] The battery self-heating method further comprises:

[0041] In the second preset state, the positive electrode of the first battery and the negative electrode of the second battery are connected to the first motor system, so that the first motor system drives the vehicle;

[0042] Alternatively, the positive electrode of the first battery and the negative electrode of the second battery are both connected to the first motor system and the second motor system, so that the first motor system and the second motor system drive the vehicle.

[0043] In combination with the second aspect, in a possible implementation manner, when the temperature of the first battery and the temperature of the second battery meet a first preset condition, the first motor system and the second motor system are controlled to enter the first preset state;

[0044] When the temperature of the first battery or the temperature of the second battery meets a second preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

[0045] In combination with the second aspect, in a possible implementation, when the temperature of the first battery is lower than a first preset value and the temperature of the second battery is lower than a second preset value, the battery self-heating device is controlled to enter the first preset state;

[0046] When the temperature of the first battery is greater than or equal to a third preset value, or the temperature of the second battery is greater than or equal to a fourth preset value, the battery self-heating device is controlled to exit the first preset state; wherein the third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

[0047] In combination with the second aspect, in a possible implementation manner, when the temperature of the first battery and the temperature of the second battery meet a first preset condition, and the temperature of the first motor and the temperature of the second motor meet a third preset condition, the first motor system and the second motor system are controlled to enter the first preset state;

[0048] When the temperature of the first battery or the temperature of the second battery meets a second preset condition, or the temperature of the first motor and the temperature of the second motor meet a fourth preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

[0049] In a third aspect, the present application provides an electrical device, wherein the electrical device comprises the battery self-heating device as described in the first aspect.

[0050] In a fourth aspect, the present application provides a vehicle, comprising the battery self-heating device as described in the first aspect or the electrical equipment as described in the third aspect.

[0051] In this solution, the first battery can charge the second battery, and the second battery can also charge the first battery. During the mutual charging process between the first battery and the second battery, self-heating of the first battery and the second battery is achieved, thereby improving the self-heating efficiency of the first battery and the second battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0053] Figure 1 A circuit diagram of a battery self-heating device provided in one embodiment of the present application;

[0054] Figure 2 A circuit diagram of another battery self-heating device provided in one embodiment of the present application;

[0055] Figure 3 A circuit diagram of another battery self-heating device provided in one embodiment of the present application;

[0056] Figure 4 A schematic diagram of the main process of a battery self-heating method provided in one embodiment of the present application;

[0057] Figure 5 A schematic diagram of a sub-process of a battery self-heating method provided in an embodiment of the present application;

[0058] Figure 6 Another schematic diagram of a sub-process of a battery self-heating method provided in an embodiment of the present application.

[0059] Description of reference numerals:

[0060] 100, a first battery; 200, a second battery; 300, a first motor system; 310, a first inverter; 311, a first upper bridge arm; 312, a first lower bridge arm; 320, a first motor; 400, a second motor system; 410, a second inverter; 411, a second upper bridge arm; 412, a second lower bridge arm; 420, a second motor; 510, a first switch; 520, a third switch; 530, a fourth switch; 540, a second switch; 550, a fifth switch; 560, a sixth switch. DETAILED DESCRIPTION

[0061] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0062] See also Figure 1 The present application provides a battery self-heating device, which includes a first battery 100, a second battery 200, a first motor system 300 and a second motor system 400; the negative electrode of the first battery 100 is connected to the positive electrode of the second battery 200, the first motor system 300 is respectively connected to the positive electrode of the first battery and the negative electrode of the second battery, the first neutral line of the first motor system 300 is connected to the second motor system 400, and the second neutral line of the second motor system 400 is connected to the series connection point of the first battery 100 and the second battery 200, so that the first battery 100 and the second battery 200 can be charged with each other through the first motor system 300 and the second motor system 400.

[0063] In some embodiments, the battery self-heating device includes a first battery 100, a second battery 200, a first motor system 300, and a second motor system 400. The battery self-heating device has a first preset state, which is a self-heating state. In the self-heating state, the negative electrode of the first battery 100 is connected to the positive electrode of the second battery 200, and the positive electrode of the first battery 100 is connected to the positive end of the first motor system 300; the negative electrode of the second battery 200 is connected to the negative end of the first motor system 300; the first neutral line of the first motor system 300 is connected to the second motor system 400; the second neutral line of the second motor system 400 is connected to the series connection point of the negative electrode of the first battery 100 and the positive electrode of the second battery 200; so that the first battery 100 and the second battery 200 can be charged with each other through the first motor system 300 and the second motor system 400.

[0064] The battery self-heating device also includes a controller, which is configured to control the first battery 100 to charge the second battery 200 through the first motor system 300 and the second motor system 400, or control the second battery 200 to charge the first battery 100 through the first motor system 300 and the second motor system 400 in a first preset state, so as to achieve heating of the first battery 100 and the second battery 200.

[0065] Among them, both the first motor system 300 and the second motor system 400 have motor windings. When the first battery 100 charges the second battery 200, the first battery will charge the motor windings in the first motor system 300 and the second motor system 400. After the motor windings in the first motor system 300 and the second motor system 400 are stored, they can be discharged, thereby charging the second battery 200. When the second battery 200 charges the first battery 100, the second battery 200 will charge the motor windings in the first motor system 300 and the second motor system 400. After the motor windings in the first motor system 300 and the second motor system 400 are stored, they can be discharged, thereby charging the first battery 100. The first battery 100 and the second battery 200 will generate heat during the mutual charging process, thereby enabling the first battery 100 or the second battery 200 to achieve self-heating.

[0066] In the embodiment provided in the present application, the first motor system 300 includes a first inverter 310 , a first motor 320 and a first switch 510 , and the second motor system 400 includes a second inverter 410 , a second motor 420 and a second switch 540 .

[0067] The positive electrode of the first battery 100 is electrically connected to the first bus terminal of the first inverter 310; the negative electrode of the second battery 200 is electrically connected to the second bus terminal of the first inverter 310. The midpoint of the first inverter 310 is electrically connected to the first motor 320, and the first neutral line of the first motor 320 is electrically connected to the first bus terminal of the second inverter 410 through the first switch 510; the midpoint of the second inverter 410 is electrically connected to the second motor 420, and the second neutral line of the second motor 420 is electrically connected to the negative electrode of the first battery 100 or the positive electrode of the second battery 200 through the second switch 540. In the self-heating state, the first switch 510 and the second switch 540 are closed, and the first battery 100 and the second battery 200 are mutually charged through the first motor system 300 and the second motor system 400.

[0068] In the embodiment provided in the present application, the first inverter 310 has an upper bridge arm and a lower bridge arm, the upper bridge arm of the first inverter 310 includes a first upper bridge arm 311, the lower bridge arm of the first inverter 310 is a first lower bridge arm 312, the second inverter 410 has an upper bridge arm and a lower bridge arm, the upper bridge arm of the second inverter 410 is a second upper bridge arm 411, and the lower bridge arm of the second inverter 410 is a second lower bridge arm 412. The controller is configured to control at least one upper bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter to be turned on at the same time in a first preset state, or control at least one lower bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter 410 to be turned on at the same time, so that the first battery 100 and the second battery 200 are charged with each other through the first motor system 300 and the second motor system 400.

[0069] If the first battery 100 charges the second battery 200, the self-heating state includes a first stage and a second stage, and the first preset state includes a first stage and a second stage. In the first stage, at least one upper bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter 410 are turned on, and the lower bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected, and the positive electrode of the first battery 100, the turned-on upper bridge arm of the first inverter 310, the first motor 320, the turned-on upper bridge arm of the second inverter 410, the second motor 420 and the negative electrode of the first battery 100 form a first charging circuit;

[0070] In the second stage, at least one lower bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter 410 are turned on, the upper bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected, and the positive electrode of the second battery 200, the second motor 420, the turned-on upper bridge arm of the second inverter 410, the first motor 320, the turned-on lower bridge arm of the first inverter 310 and the negative electrode of the second battery 200 form a second charging circuit.

[0071] Exemplary. In the first stage, the first upper bridge arm 311 is turned on, the second upper bridge arm 411 is turned on, the first lower bridge arm 312 is turned off, and the second lower bridge arm 412 is turned off. The positive electrode of the first battery 100, the first upper bridge arm 311, the first motor 320, the second upper bridge arm 411 of the second inverter 410, the second motor 420, and the negative electrode of the first battery 100 form a first charging circuit; the current generated by the first battery 100 flows through the first upper bridge arm 311, the first motor 320, the first switch 510, the second upper bridge arm 411, the second motor 420, the second switch 540 in sequence and returns to the negative electrode of the first battery 100. At this time, the first battery 100 charges the windings in the first motor 320 and the windings of the second motor 420. In the second stage, the windings in the first motor 320 and the windings in the second motor 420 will discharge after storing electricity. At this time, the first upper bridge arm 311 is disconnected, the second upper bridge arm 411 is turned on, the first lower bridge arm 312 is turned on, and the second lower bridge arm 412 is disconnected. The positive electrode of the second battery 200, the second motor 420, the second upper bridge arm 411, the first motor 320, and the first lower bridge arm 312 form a second charging circuit. Since the windings in the first motor 320 and the windings in the second motor 420 are in series, the windings in the first motor 320 and the windings in the second motor 420 charge the second battery 200. If the second battery 200 charges the first battery 100, the first upper bridge arm 311 is disconnected, the second upper bridge arm 411 is turned on, the first lower bridge arm 312 is turned on, and the second lower bridge arm 412 is disconnected. The current generated by the second battery 200 flows through the second switch 540, the second motor 420, the second upper bridge arm 411, the second motor 420, the first switch 510, the second motor 420, the first lower bridge arm 312 in sequence and returns to the negative electrode of the second battery 200. At this time, the second battery 200 charges the windings in the first motor 320 and the windings of the second motor 420. The windings in the first motor 320 and the windings in the second motor 420 will discharge after being charged. When the windings in the first motor 320 and the windings in the second motor 420 are discharging, the first upper bridge arm 311 is turned on, the second upper bridge arm 411 is turned on, the first lower bridge arm 312 is disconnected, and the second lower bridge arm 412 is disconnected. Since the windings in the first motor 320 and the windings in the second motor 420 are in series connection, the windings in the first motor 320 and the windings in the second motor 420 charge the first battery 100. In the embodiment provided in the present application, the windings in the first motor 320 and the windings in the second motor 420 are connected in series, which can reduce the ripple of the battery self-heating device during heating.

[0072] In the embodiment provided in the present application, the first bus terminal of the second inverter 410 is connected to the first bus terminal of the first inverter 310, and a third switch 520 is provided between the first bus terminal of the second inverter 410 and the first bus terminal of the first inverter 310; a fourth switch 530 is provided between the second bus terminal of the second inverter 410 and the second bus terminal of the first inverter 310. In the self-heating state, the third switch 520 and the fourth switch 530 are both in the disconnected state.

[0073] The battery self-heating device has a second preset state, which is a driving state. In the driving state, the first switch 510 is disconnected, the second switch 540 is disconnected, the third switch 520 is closed, and the fourth switch 530 is closed; the first battery 100 and the second battery 200 are configured to be connected in series with each other and supply power to the first motor 320 and the second motor 420, so as to enable the first motor system 300 and the second motor system 400 to drive the vehicle.

[0074] When the first battery 100 and the second battery 200 are connected in series and supply power to the first motor 320 and the second motor 420, the first motor 320 and the second motor 420 are connected in parallel to each other, and the first motor 320 and the second motor 420 can work normally (the first motor 320 and the second motor 420 can both rotate normally as driving devices). The first inverter 310 can convert the direct current of the first battery 100 and the second battery 200 into alternating current to supply power to the first motor 320, and the second inverter 410 can convert the direct current of the first battery 100 and the second battery 200 into alternating current to supply power to the second motor 420.

[0075] The battery self-heating device can be applied to vehicles, and the first battery 100 and the second battery 200 supply power to the parallel first motor system 300 and the second motor system 400 according to the power demand of the vehicle, and the two output mechanical energy to drive the vehicle. The first battery 100 and the second battery 200 can be power batteries.

[0076] In the examples provided in this application, see Figure 2 The number of the first motor systems 300 can be multiple, and the multiple first motor systems 300 are connected in parallel. The first inverter 310 in each first motor system 300 is connected to the first bus terminal of the second inverter 410 through the first switch 510.

[0077] By controlling the number of closed first switches 510, the number of multiple first motors 320 participating in self-heating can be controlled. Multiple parallel first motors 320 participating in self-heating can increase the current size of the first battery 100 and the second battery 200 when charging each other, thereby improving the self-heating efficiency of the first battery 100 and the second battery 200.

[0078] See also Figure 2 The number of the second motor systems 400 is multiple, and the multiple second motor systems 400 are connected in parallel to the first bus terminal of the first inverter 310 and the second bus terminal of the first inverter 310, and the first neutral line of the first motor 320 in the first motor system 300 is connected to the second motor system 400 through the first switch 510. The second neutral line of the second motor 420 in each second motor system 400 is connected to the negative electrode of the first battery 100 or the positive electrode of the second battery 200 through the second switch 540.

[0079] By controlling the number of second switches 540 that are closed, the number of multiple second motors 420 that participate in self-heating can be controlled. Multiple parallel second motors 420 participate in self-heating, which can increase the current size of the first battery 100 and the second battery 200 when charging each other, thereby improving the self-heating efficiency of the first battery 100 and the second battery 200.

[0080] In the present application, the controller is configured to control the number of the first motor 320 and / or the second motor 420 in the first charging circuit, and control the number of the first motor 320 and / or the second motor 420 in the second charging circuit. The controller can control the number of the first motor 320 and the second motor 420 participating in forming the first charging circuit and the number of the first motor 320 and the second motor 420 participating in forming the second charging circuit. Specifically, the controller can control the number of the first motor 320 and the second motor 420 participating in forming the first charging circuit by controlling the number of the first switch 510, the second switch 540, the third switch 520, the fourth switch 530, the fifth switch 550 and the sixth switch 560 closed, and the controller can control the number of the first motor 320 and the second motor 420 participating in forming the second charging circuit by controlling the number of the first switch 510, the second switch 540, the third switch 520, the fourth switch 530, the fifth switch 550 and the sixth switch 560 closed.

[0081] In some embodiments, see Figure 3, the number of the second motor systems 400 is multiple, and the multiple second motor systems 400 are connected in sequence. The second neutral line of the second motor 420 in one second motor system 400 is connected to the first bus terminal of the first inverter 310 in the next second motor system 400 through the second switch 540, and the second neutral line of the second motor 420 in the last second motor system 400 is connected to the series connection point of the negative electrode of the first battery 100 and the positive electrode of the second battery 200 through the second switch 540. By controlling the number of closed second switches 540, the number of the multiple second motors 420 participating in self-heating can be controlled. The multiple second motors 420 connected in series participate in self-heating, which can reduce the ripple of the first battery 100 and the second battery 200 when charging each other. The negative terminals of two adjacent second motor systems 400 are connected through the third switch 520, and the positive terminals of two adjacent second motor systems 400 are connected through the fourth switch 530. Specifically, the first bus terminals of two adjacent second inverters 410 are connected via a fifth switch 550, and the second bus terminals of two adjacent second inverters 410 are connected via a sixth switch 560. When the battery self-heating device is in the driving state, all the first switches 510 and the second switches 540 are controlled to be disconnected, and the number of the second motors 420 participating in the normal driving can be controlled by controlling the fifth switch 550 and the sixth switch 560.

[0082] In the second preset state, the first switch 510 and the second switch 540 are controlled to be disconnected, and the third switch 520, the fourth switch 530, the fifth switch 550 and the sixth switch 560 are controlled to be closed; or the first switch 510, the second switch 540, the fifth switch 550 and the sixth switch 560 are controlled to be disconnected, and the third switch 520, the fourth switch 530, the fifth switch 550 and the sixth switch 560 are controlled to be closed, so as to enable the first motor system 300 and at least part of the second motor system 400 to drive the vehicle.

[0083] The battery self-heating device also includes a battery management unit, which obtains the temperature of the first battery 100 and the temperature of the second battery 200. The battery management unit is used to control the first battery 100 to charge the second battery 200, or to control the second battery 200 to charge the first battery 100. The battery management unit can control the action switching of the first battery 100 charging the second battery 200 and the second battery 200 charging the first battery 100. The battery management unit is also used to control the current size and ripple of the first battery 100 charging the second battery 200 according to the battery parameters of the first battery 100 and the battery parameters of the second battery 200. The battery management unit is also used to control the current size and ripple of the second battery 200 charging the first battery 100 according to the battery parameters of the first battery 100 and the battery parameters of the second battery 200; the battery parameters of the first battery 100 include at least one of the real-time temperature of the first battery 100 and the real-time power of the first battery 100, and the battery parameters of the second battery 200 include at least one of the real-time temperature of the second battery 200 and the real-time power of the second battery 200.

[0084] In the embodiment provided in the present application, in the self-heating state, the self-heating current and ripple will affect the self-heating efficiency, and the battery circuit unit controls the self-heating current and ripple to control the self-heating efficiency of the battery self-heating device. Among them, the ripple is the AC component of the direct current in the self-heating circuit. In the heating circuit, the first motor 320 and the second motor 420 are connected in series to reduce the ripple of the self-heating circuit and increase the inductance of the self-heating circuit.

[0085] The number of the first motor systems 300 may be X, and the number of the second motor systems 400 may be Z, where X is greater than or equal to 2 and Z is greater than or equal to 2. When the X first switches 510 and the Z second switches 540 are disconnected, and the third switch 520 and the fourth switch 530 are closed, the combination formed by the first battery 100 and the second battery 200 connected in series supplies power to the first motor system 300 and the second motor system 400.

[0086] When the X first switches 510 and the Z second switches 540 are closed, and the third switch 520 and the fourth switch 530 are opened, the battery self-heating device forms a self-heating circuit, and the first motor system 300 of the first battery 100 or the second battery 200 outputs a current, which flows through the X first motors 320 windings and then merges into the neutral line of the first motor 320, flows into the second motors 420 of the plurality of second motor systems 400 through the first switch 510, and then merges into the neutral line of the second motor 420, and flows into the midpoint between the first battery 100 and the second battery 200 through the fourth switch.

[0087] The controller is used to collect the temperature of the first motor 320 and the temperature of the second motor 420; the controller is used to control the states of the first switch 510, the second switch 540, the third switch 520 and the fourth switch 530 according to the temperature of the first battery 100, the temperature of the second battery 200, the temperature of the first motor 320 and the temperature of the second motor 420.

[0088] The controller is configured to control the first motor system 300 and the second motor system 400 to enter a first preset state when the temperature of the first battery 100 and the temperature of the second battery 200 meet a first preset condition;

[0089] When the temperature of the first battery 100 or the temperature of the second battery 200 meets the second preset condition, the first motor system 300 and the second motor system 400 are controlled to exit the first preset state.

[0090] When the temperature of the first battery 100 is at a first preset value and the temperature of the second battery 200 is lower than a second preset value, the controller is used to control the first switch 510 to be closed, the second switch 540 to be closed, the third switch 520 to be opened, and the fourth switch 530 to be opened; the battery self-heating device starts the self-heating state.

[0091] When the temperature of the first battery 100 is greater than or equal to the third preset value or the temperature of the second battery 200 is greater than or equal to the fourth preset value, the controller is used to control the first switch 510 to be disconnected, the second switch 540 to be disconnected, the third switch 520 to be closed, and the fourth switch 530 to be closed, the first motor system 300 and the second motor system 400 to exit the first preset state, and the first motor system 300 and the second motor system 400 to start the driving state. The third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

[0092] The controller can control the number of the first motor system 300 and the second motor system 400 connected to the self-heating circuit, and dynamically adjust the current and ripple of the self-heating circuit.

[0093] In the present application, when the temperature of the first motor 320 is lower than the fifth preset value and the temperature of the second motor 420 is lower than the sixth preset value, the controller is used to control the battery self-heating device to start the self-heating state, and the controller is used to control the first switch 510 to be opened, the second switch 540 to be opened, the third switch 520 to be closed, and the fourth switch 530 to be closed.

[0094] When the temperature of the first motor 320 is greater than or equal to the seventh preset value and the temperature of the second motor 420 is greater than or equal to the sixth preset value, the controller is configured to control the battery self-heating device to exit the first preset state and execute the driving state, and the controller is used to control the first switch 510 to be disconnected, the second switch 540 to be disconnected, the third switch 520 to be closed, and the fourth switch 530 to be closed. The seventh preset value is greater than or equal to the fifth preset value, and the eighth preset value is greater than or equal to the sixth preset value.

[0095] In the embodiment provided in the present application, the controller is configured to, in a first preset state, conduct heat generated by the first battery and the second battery to the vehicle passenger compartment through a pump to provide a heat source.

[0096] The battery self-heating device also includes a capacitor, the two ends of which are respectively connected to the positive electrode of the first battery 100 and the negative electrode of the second battery 200, and the capacitor plays a filtering role.

[0097] The present application discloses an electrical device, which includes a battery self-heating device. The battery self-heating device in the present application performs self-heating on the first battery 100 and the second battery 200, while reducing the current ripple by using a plurality of second motors 420 connected in series. By controlling the number of the first motor system 300 and the second motor system 400 connected to the self-heating, adjusting the current and ripple of the battery self-heating device, the heating speed of the first battery 100 and the second battery 200 can be increased.

[0098] The present application discloses a vehicle, which includes electrical equipment and a self-heating device. The vehicle may be an electric vehicle.

[0099] See also Figure 4 The present application also provides a battery self-heating method, which is applied to the above-mentioned battery self-heating device, and the battery self-heating device has a first preset state, which is a self-heating state; the battery self-heating method includes:

[0100] S101, in a first preset state, the first battery and the first motor system and the second motor system form a first power-on circuit, or the second battery and the second motor system and the first motor system form a second power-on circuit, so that the first battery and the second battery can be charged through the first motor system and the second motor system to achieve heating of the first battery and the second battery.

[0101] When the battery is in the self-heating state, the first battery 100 and the second battery 200 charge each other to increase the temperature of the first battery 100 and the second battery 200.

[0102] The battery self-heating device also includes a second preset state, which is a driving state.

[0103] In the embodiment provided in the present application, self-heating of the first battery and the second battery can be achieved through the first power-on circuit. Specifically, the first power-on circuit has a first timing sequence and a second timing sequence. In the first timing sequence, at least one upper bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter 410 are turned on, and the lower bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected. The positive electrode of the first battery 100, the turned-on upper bridge arm of the first inverter 310, the first motor 320, the turned-on upper bridge arm of the second inverter 410, the second motor 420 and the negative electrode of the first battery 100 form a first charging circuit; in the second timing sequence, the first inverter 3 At least one lower bridge arm of the first inverter 10 and at least one upper bridge arm of the second inverter 410 are turned on, the upper bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected, the positive electrode of the second battery 200, the second motor 420, the turned-on upper bridge arm of the second inverter 410, the first motor 320, the turned-on lower bridge arm of the first inverter 310 and the negative electrode of the second battery 200 form a second charging circuit, wherein the first timing corresponds to the first stage, and the second timing corresponds to the second stage, by switching back and forth between the first timing and the second timing, the first battery can charge the windings of the first motor 320 and the windings of the second motor 420, as well as the second battery.

[0104] In the embodiment provided in the present application, the self-heating of the first battery and the second battery can be achieved through the second power-on circuit. Specifically, the first power-on circuit includes a third timing sequence and a fourth timing sequence. In the third timing sequence, at least one lower bridge arm of the first inverter 310 and at least one upper bridge arm of the second inverter 410 are turned on, the upper bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected, and the negative electrode of the second battery 200, the lower bridge arm of the first inverter 310, the first motor 320, the upper bridge arm of the second inverter 410, the second motor 420 and the positive electrode of the second battery 200 form a second charging circuit; in the fourth timing sequence, at least one upper bridge arm of the first inverter 310 and the second inverter 410 are turned on. At least one upper bridge arm is turned on, the lower bridge arm of the first inverter 310 and the lower bridge arm of the second inverter 410 are both disconnected, the negative electrode of the first battery 100, the second motor 420, the turned-on upper bridge arm of the second inverter 410, the first motor 320, the turned-on upper bridge arm of the first inverter 310 and the entire pole of the first battery 100 form a first charging circuit, wherein the third timing corresponds to the second stage, and the fourth timing corresponds to the first stage, by switching back and forth between the third timing and the fourth timing, the second battery can charge the windings of the first motor 320 and the windings of the second motor 420, as well as the first battery.

[0105] S102, in the second preset state, the positive electrode of the first battery and the negative electrode of the second battery are connected to the first motor system to enable the first motor system to drive the vehicle; or the positive electrode of the first battery and the negative electrode of the second battery are connected to the first motor system and the second motor system to enable the first motor system and the second motor system to drive the vehicle.

[0106] In order to avoid excessive self-heating of the first battery 100 and the second battery 200 and excessive temperature rise, when the temperature of the first battery 100 is greater than or equal to a third preset value, or the temperature of the second battery 200 is greater than or equal to a fourth preset value, the battery self-heating device stops self-heating and starts the driving state.

[0107] In the embodiments provided in the present application, the self-heating state and the driving state of the battery self-heating device can be switched with each other.

[0108] The first motor system 300 includes a first motor 320 and a first switch 510; the positive electrode of the first battery 100 is connected to the first motor 320, and the first neutral line of the first motor 320 is connected to the second motor system 400 through the first switch 510;

[0109] The first motor system 300 further includes a first inverter 310, a first bus terminal of the first inverter 310 is connected to the positive electrode of the first battery 100, a second bus terminal of the first inverter 310 is connected to the negative electrode of the second battery 200, and the first inverter 310 is also connected to the first switch 510 through the winding of the first motor 320;

[0110] The second motor system 400 includes a second motor 420 and a second switch 540; the second motor 420 is connected to the first neutral line of the first motor system 300, and the second neutral line of the second motor 420 is connected to the negative electrode of the first battery 100 and the positive electrode of the second battery 200 through the second switch 540; the second motor system 400 also includes a second inverter 410, a first bus terminal of the second inverter 410 is connected to the first neutral line of the first motor 320 through the first switch 510, a second bus terminal of the second inverter is connected to the second bus terminal of the first inverter 310, and the second inverter 410 is also connected to the second switch 540 through the winding of the second motor 420;

[0111] The step of causing the battery self-heating device to execute the self-heating state includes:

[0112] The first switch 510 is controlled to be closed, the second switch 540 is controlled to be closed, the third switch 520 is controlled to be opened, and the fourth switch 530 is controlled to be opened.

[0113] The controlling the battery self-heating device to start the driving state includes:

[0114] The first switch 510 is controlled to be opened, the second switch 540 is controlled to be opened, the third switch 520 is controlled to be closed, and the fourth switch 530 is controlled to be closed.

[0115] There are multiple first motor systems 300, and the multiple first motor systems 300 are connected in parallel. The first inverter 310 in each first motor system 300 is connected to the first bus terminal of the second inverter 410 through the first switch 510;

[0116] See also Figure 5 , S1011, when the temperature of the first battery and the temperature of the second battery meet the first preset condition, control the first motor system and the second motor system to enter the first preset state; when the temperature of the first battery or the temperature of the second battery meets the second preset condition, control the first motor system and the second motor system to exit the first preset state.

[0117] S1021, when the temperature of the first battery is lower than the first preset value and the temperature of the second battery is lower than the second preset value, control the battery self-heating device to enter the first preset state; when the temperature of the first battery 100 is greater than or equal to the third preset value, or the temperature of the second battery is greater than or equal to the fourth preset value, control the battery self-heating device to exit the first preset state; wherein the third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

[0118] The step of causing the battery self-heating device to execute a self-heating state further comprises:

[0119] The number of closings of the first switch 510 in the first motor system 300 is controlled by the controller based on the temperature of the first battery 100 and the temperature of the second battery 200 .

[0120] There are multiple second motor systems 400, and the multiple second motor systems 400 are connected in parallel. The second neutral line of the second motor 420 in each second motor system 400 is connected to the negative electrode of the first battery 100 and the positive electrode of the second battery 200 through the second switch 540;

[0121] See also Figure 6 , S1013, when the temperature of the first battery and the temperature of the second battery meet the first preset condition, and the temperature of the first motor and the temperature of the second motor meet the third preset condition, control the first motor system and the second motor system to enter the first preset state;

[0122] S1014, when the temperature of the first battery or the temperature of the second battery meets the second preset condition, or the temperature of the first motor and the temperature of the second motor meet the fourth preset condition, control the first motor system and the second motor system to exit the first preset state.

[0123] The step of causing the battery self-heating device to execute a self-heating state further comprises:

[0124] The number of closed second switches 540 in the second motor system 400 is controlled based on the temperature of the first battery 100 and the temperature of the second battery 200 .

[0125] There are multiple second motor systems 400, and the multiple second motor systems 400 are connected in sequence. The second neutral line of the second motor 420 in one second motor system 400 is connected to the first bus terminal of the first inverter 310 in the next second motor system 400 through the second switch 540, and the second neutral line of the second motor 420 in the last second motor system 400 is connected to the negative electrode of the first battery 100 and the positive electrode of the second battery 200 through the second switch 540.

[0126] The step of causing the battery self-heating device to execute a self-heating state further comprises:

[0127] The number of closed second switches 540 in the second motor system 400 is controlled based on the temperature of the first battery 100 , the temperature of the second battery 200 , the temperature of the first motor 320 , and the temperature of the second motor 420 .

[0128] The controller controls the first switch 510 to be closed, the second switch 540 to be closed, the third switch 520 to be opened, and the fourth switch 530 to be opened, so that the first battery 100 releases electrical energy to flow through the first motor 320 and the second motor 420 to charge the second battery 200, or the second battery 200 releases electrical energy to flow through the first motor 320 and the second motor 420 to charge the first battery 100.

[0129] In the present application, the battery management unit can obtain the temperature of the first battery 100 and the second battery 200. When the temperature of the first battery 100 and the temperature of the second battery 200 are lower than the first preset value, the controller controls the first switch 510 to close, the second switch 540 to close, the third switch 520 and the fourth switch 530 to open, so that the first battery 100 and the second battery 200 are charged with each other, so that the first battery 100 and the second battery 200 are self-heated. The battery management unit detects the temperature and power of the first battery 100 in real time, and the battery control unit detects the temperature and power of the second battery 200 in real time. When the temperature of the first battery 100 and the temperature of the second battery 200 reach the first preset value, the controller controls the first switch 510 to open, the second switch 540 to open, the third switch 520 to close, and the fourth switch 530 to close. The controller controls the first motor 320 of the first motor system 300 and the second motor 420 of the second motor system 400 to rotate normally to prevent the first battery 100 and the second battery 200 from continuously self-heating, resulting in excessive temperatures of the first battery 100 and the second battery 200.

[0130] When the temperature of the first motor 320 and the second motor 420 reaches a second preset value, the controller controls the first switch 510 to be disconnected, the second switch 540 to be disconnected, the third switch 520 to be closed, and the fourth switch 530 to be closed. The controller controls the first motor 320 of the first motor system 300 and the second motor of the second motor system 400 to rotate normally to prevent the first battery 100 and the second battery 200 from continuously self-heating, resulting in excessive temperatures of the first motor 320 and the second motor 420.

[0131] In the examples provided in this application, see Figure 5 , the battery self-heating method can be applied to vehicle control, and the battery self-heating method includes:

[0132] The controller determines whether the battery module needs to turn on the self-heating function.

[0133] The battery management unit detects the temperature and power level of the first battery 100 and the second battery 200 and feeds back the information to the controller.

[0134] If the temperature of the first battery 100 is lower than a first preset value and the temperature of the second battery 200 is lower than a second preset value, the controller evaluates the motor state and controls the battery self-heating device to self-heat through the controller.

[0135] The first motor 320 and the second motor 420 detect their internal temperatures respectively. If the temperature of the first motor 320 is higher than the seventh preset value, or the temperature of the second motor 420 is higher than the eighth preset value, the controller controls the battery self-heating device to stop the self-heating function.

[0136] If the temperature of the first battery 100 is higher than the third preset value, or the temperature of the second battery 200 is higher than the fourth preset value, the battery self-heating device stops self-heating by turning on the controller.

[0137] The present application also discloses an electrical device, which includes a battery self-heating device.

[0138] The present application also discloses a vehicle, the vehicle includes an electrical device, and the vehicle may further include an electrical device.

[0139] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0140] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0141] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0142] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0143] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery self-heating device, characterized in that: including a first battery, a second battery, a first motor system, and a second motor system; The negative electrode of the first battery is connected to the positive electrode of the second battery, the first motor system is connected to the positive electrode of the first battery and the negative electrode of the second battery respectively, the first neutral line of the first motor system is connected to the second motor system, and the second neutral line of the second motor system is connected to the series connection point of the first battery and the second battery, so that the first battery and the second battery can be charged by each other through the first motor system and the second motor system.

2. The battery self-heating device according to claim 1, characterized in that: It also includes a controller, which is configured to control the first battery to charge the second battery through the first motor system and the second motor system, or control the second battery to charge the first battery through the first motor system and the second motor system in a first preset state, so as to achieve heating of the first battery and the second battery.

3. The battery self-heating device according to claim 2, characterized in that: The first motor system includes a first switch connected between the first neutral line and the second motor system; the controller is configured to control the first switch to be closed in the first preset state.

4. The battery self-heating device according to claim 3, characterized in that: The first motor system also includes a first motor and a first inverter, the first bus terminal of the first inverter is connected to the positive electrode of the first battery, the second bus terminal of the first inverter is connected to the negative electrode of the second battery, and the midpoint of the first inverter is connected to the first motor.

5. The battery self-heating device according to claim 4, characterized in that: There are multiple first motor systems, and the multiple first motor systems are connected in parallel to the positive electrode of the first battery and the negative electrode of the second battery. The first neutral line of the first motor in each of the first motor systems is connected to the second motor system through the first switch.

6. The battery self-heating device according to claim 4 or 5, characterized in that: The second motor system includes a second switch connected between the second neutral line and a series connection point of the first battery and the second battery; the controller is configured to control the first switch and the second switch to be closed in the first preset state.

7. The battery self-heating device according to claim 6, characterized in that: The second motor system further includes a second motor and a second inverter, wherein a first bus terminal of the second inverter is connected to the first neutral line, and a midpoint of the second inverter is connected to the second motor.

8. The battery self-heating device according to claim 7, characterized in that: The first bus end of the second inverter is connected to the first bus end of the first inverter, and a third switch is provided between the first bus end of the second inverter and the first bus end of the first inverter; the second bus end of the second inverter is connected to the second bus end of the first inverter, and a fourth switch is provided between the second bus end of the second inverter and the second bus end of the first inverter.

9. The battery self-heating device according to claim 8, characterized in that: There are multiple second motor systems, and the multiple second motor systems are connected in parallel to the first bus end of the first inverter and the second bus end of the first inverter. The first neutral line of the first motor in the first motor system is connected to the second motor system through the first switch.

10. The battery self-heating device according to claim 8, characterized in that: There are multiple second motor systems, and the multiple second motor systems are connected in sequence. The second neutral line of the second motor in one second motor system is connected to the first bus terminal of the second inverter in the next second motor system through the second switch, and the second neutral line of the second motor in the last second motor system is connected to the series connection point of the first battery and the second battery through the second switch.

11. The battery self-heating device according to any one of claims 8 to 10, characterized in that: The controller is configured to control the first switch and the second switch to be closed, and control the third switch and the fourth switch to be opened in the first preset state.

12. The battery self-heating device according to any one of claims 8 to 10, characterized in that: The controller is configured to control the first switch and the second switch to be opened, and control the third switch and the fourth switch to be closed in a second preset state, so that the first motor system and the second motor system drive the vehicle.

13. The battery self-heating device according to claim 10, characterized in that: The first bus terminals of two adjacent second inverters are connected via a fifth switch, and the second bus terminals of two adjacent second inverters are connected via a sixth switch.

14. The battery self-heating device according to claim 13, characterized in that: The controller is configured to control the first switch and the second switch to be closed, and control the third switch, the fourth switch, the fifth switch, and the sixth switch to be opened in the first preset state.

15. The battery self-heating device according to claim 13, characterized in that: In a second preset state, the first switch and the second switch are controlled to be disconnected, and the third switch, the fourth switch, the fifth switch and the sixth switch are controlled to be closed; or the first switch, the second switch, the fifth switch and the sixth switch are controlled to be disconnected, and the third switch and the fourth switch, the fifth switch and the sixth switch are controlled to be closed, so as to enable the first motor system and at least part of the second motor system to drive the vehicle.

16. The battery self-heating device according to claim 7, characterized in that: The controller is configured to control at least one upper bridge arm of the first inverter and at least one upper bridge arm of the second inverter to be turned on at the same time, or to control at least one lower bridge arm of the first inverter and at least one upper bridge arm of the second inverter to be turned on at the same time in the first preset state, so that the first battery and the second battery can charge each other through the first motor system and the second motor system.

17. The battery self-heating device according to claim 16, characterized in that: The first preset state includes a first stage and a second stage. In the first stage, at least one upper bridge arm of the first inverter and at least one upper bridge arm of the second inverter are turned on, the lower bridge arm of the first inverter and the lower bridge arm of the second inverter are both disconnected, and the positive electrode of the first battery, the turned-on upper bridge arm of the first inverter, the first motor, the turned-on upper bridge arm of the second inverter, the second motor and the negative electrode of the first battery form a first charging circuit; In the second stage, at least one lower bridge arm of the first inverter and at least one upper bridge arm of the second inverter are turned on, the upper bridge arm of the first inverter and the lower bridge arm of the second inverter are both disconnected, and the positive electrode of the second battery, the second motor, the turned-on upper bridge arm of the second inverter, the first motor, the turned-on lower bridge arm of the first inverter and the negative electrode of the second battery form a second charging circuit.

18. The battery self-heating device according to claim 17, characterized in that: The controller is configured to control the number of the first motor and / or the second motor in the first charging circuit, and to control the number of the first motor and / or the second motor in the second charging circuit.

19. The battery self-heating device according to any one of claims 7 to 10, characterized in that: The controller is configured to control the first motor system and the second motor system to enter the first preset state when the temperature of the first battery and the temperature of the second battery meet a first preset condition; When the temperature of the first battery or the temperature of the second battery meets a second preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

20. The battery self-heating device according to claim 19, characterized in that: When the temperature of the first battery is lower than a first preset value and the temperature of the second battery is lower than a second preset value, the controller is configured to control the battery self-heating device to enter the first preset state; When the temperature of the first battery is greater than or equal to a third preset value, or the temperature of the second battery is greater than or equal to a fourth preset value, the controller is configured to control the battery self-heating device to exit the first preset state; wherein the third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

21. The battery self-heating device according to claim 19, characterized in that: The controller is configured to control the first motor system and the second motor system to enter the first preset state when the temperature of the first battery and the temperature of the second battery meet a first preset condition and the temperature of the first motor and the temperature of the second motor meet a third preset condition; When the temperature of the first battery or the temperature of the second battery meets a second preset condition, or the temperature of the first motor and the temperature of the second motor meet a fourth preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

22. The battery self-heating device according to claim 21, characterized in that: When the temperature of the first motor is lower than a fifth preset value and the temperature of the second motor is lower than a sixth preset value, the controller is configured to control the battery self-heating device to enter the first preset state; When the temperature of the first motor is greater than or equal to a seventh preset value, or the temperature of the second motor is greater than or equal to an eighth preset value, the controller is configured to control the battery self-heating device to exit the first preset state; wherein the seventh preset value is greater than or equal to the fifth preset value, and the eighth preset value is greater than or equal to the sixth preset value.

23. The battery self-heating device according to claim 2, characterized in that: The controller is configured to, in the first preset state, conduct heat generated by the first battery and the second battery to the vehicle passenger compartment through a pump to provide a heat source.

24. The battery self-heating device according to claim 2, characterized in that: A capacitor is also included, and two ends of the capacitor are respectively connected to the positive electrode of the first battery and the negative electrode of the second battery.

25. A battery self-heating method, characterized in that: The battery self-heating method is applied to the battery self-heating device as described in any one of claims 1-24.

26. The battery self-heating method according to claim 25, characterized in that: The battery self-heating device includes a first preset state, which is a self-heating state; The battery self-heating method comprises: In the first preset state, the first battery and the first motor system and the second motor system form a first power-on circuit, or the second battery and the second motor system and the first motor system form a second power-on circuit, so that the first battery and the second battery can be charged through the first motor system and the second motor system to achieve heating of the first battery and the second battery.

27. The battery self-heating method according to claim 26, characterized in that: The battery self-heating device further includes a second preset state, which is a driving state; The battery self-heating method further comprises: In the second preset state, the positive electrode of the first battery and the negative electrode of the second battery are connected to the first motor system, so that the first motor system drives the vehicle; Alternatively, the positive electrode of the first battery and the negative electrode of the second battery are both connected to the first motor system and the second motor system, so that the first motor system and the second motor system drive the vehicle.

28. The battery self-heating method according to claim 26, characterized in that: When the temperature of the first battery and the temperature of the second battery meet a first preset condition, controlling the first motor system and the second motor system to enter the first preset state; When the temperature of the first battery or the temperature of the second battery meets a second preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

29. The battery self-heating method according to claim 28, characterized in that: When the temperature of the first battery is lower than a first preset value and the temperature of the second battery is lower than a second preset value, the battery self-heating device is controlled to enter the first preset state; when the temperature of the first battery is greater than or equal to a third preset value, or the temperature of the second battery is greater than or equal to a fourth preset value, the battery self-heating device is controlled to exit the first preset state; wherein the third preset value is greater than or equal to the first preset value, and the fourth preset value is greater than or equal to the second preset value.

30. The battery self-heating method according to claim 26, characterized in that: When the temperature of the first battery and the temperature of the second battery meet a first preset condition, and the temperature of the first motor and the temperature of the second motor meet a third preset condition, controlling the first motor system and the second motor system to enter the first preset state; When the temperature of the first battery or the temperature of the second battery meets a second preset condition, or the temperature of the first motor and the temperature of the second motor meet a fourth preset condition, the first motor system and the second motor system are controlled to exit the first preset state.

31. An electrical equipment, characterized in that: The electrical equipment comprises a battery self-heating device as described in any one of claims 1-24.

32. A vehicle, characterized in that: The vehicle comprises the battery self-heating device according to any one of claims 1 to 24 or the electrical equipment according to claim 31.

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