Battery main control box, charge / discharge circuit, and electrical equipment

Abstract

This application discloses a battery main control box, a charge / discharge circuit, and electrical equipment. The battery main control box includes two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines, the two first electrode lines being for connection to two electrical loads and two batteries, respectively, and the second electrode line being for connection to the two electrical loads and the two batteries, respectively. The battery main control box of the embodiment of this application includes two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines, and by controlling the opening and closing of the switch, the circuit structure in which the battery is located is changed, thereby flexibly changing the circuit structure to realize more functions.

Description

Technical Field

[0001] (Cross - reference to Related Applications) This application claims the priority and benefits of a Chinese patent application with an application number of 202321327959.7 and an invention title of "Battery Main Control Box, Charge - Discharge Circuit, and Electrical Equipment", which was filed with the China National Intellectual Property Administration on May 29, 2023, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, specifically to battery main control boxes, charge - discharge circuits, and electrical equipment.

Background Art

[0003] With the continuous development of new energy technologies, new energy means of transportation, especially new energy electrical equipment such as electric vehicles, widely use power batteries as power sources. Power batteries such as lithium - ion batteries have advantages such as high power density, high cycle life, and excellent environmental protection effects.

[0004] In new energy means of transportation, generally, a structure combining a battery and a dual - motor architecture is used. The dual - motor architecture includes two motors connected in parallel, and the electrical energy released from the battery is converted into mechanical energy by the two motors to drive and move the new energy means of transportation. The battery main control box is for controlling the battery. In the battery main control box of related technologies, the circuit structure where the battery is located cannot be changed, the circuit connection method is fixed, and the circuit structure cannot be flexibly changed to realize more functions.

[0005] The above description is only intended to provide background technical information related to this application and does not necessarily constitute prior art.

Summary of the Invention

[0006] In view of the problems in related technologies, such as the inability to change the circuit structure in which the battery is located, the fixed circuit connection method, and the inability to flexibly change the circuit structure to realize more functions in a battery main control box, this application provides a battery main control box, a charge / discharge circuit, and electrical equipment, the battery main control box including two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines, the two first electrode lines being for connection to two electrical loads and two batteries respectively, and the second electrode line being for connection to the two electrical loads and the two batteries respectively. By controlling the opening and closing of the switch, the circuit structure in which the battery is located can be changed, and the circuit structure can be flexibly changed to realize more functions.

[0007] In a first embodiment of the present invention, a battery main control box is provided, comprising two first pole lines and one second pole line, wherein the two first pole lines are each a first pole first line and a first pole second line, the first pole first line is for connection to a first electrical load and a first pole of a first battery, the first pole second line is for connection to a second electrical load and a first pole of a second battery, the second pole line is for connection to the first electrical load, the second electrical load, the second pole of the first battery, and the second pole of the second battery, the first pole is either a positive or negative pole, the second pole is the other pole of the positive or negative pole, and a first switch is connected between the first pole first line and the first pole second line.

[0008] The battery main control box of the embodiment of this application includes two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines. By controlling the opening and closing of the switch, the circuit structure in which the battery is located can be changed, allowing for flexible modification of the circuit structure and enabling more functions.

[0009] The battery main control box of the embodiment of this application includes a first pole first line, a first pole second line, and a second pole line, with a first switch connected between the first end of the first pole first line and the first end of the first pole second line. By controlling the opening and closing of the first switch, the circuit structure in which the battery is located can be changed, allowing for flexible modification of the circuit structure and enabling more functions.

[0010] In some embodiments of this application, the battery main control box further includes a first connector and a second connector, the first pole first line being connected to the first connector and the second connector, respectively, the first connector being for connection to the first pole of the first battery and the second connector being for connection to the first electrical load.

[0011] The first connector allows the first pole of the first battery to be easily connected to the battery main control box with a lead wire, thereby improving the convenience of wiring between the first battery and the battery main control box. The second connector allows one end of the first electrical load to be easily connected to the battery main control box, thereby improving the convenience of wiring between the first electrical load and the battery main control box.

[0012] In some embodiments of this application, the battery main control box further includes a third connector and a fourth connector, the first pole second line being connected to the third connector and the fourth connector, respectively, the third connector being for connection to the first pole of the second battery and the fourth connector being for connection to the second electrical load.

[0013] The third connector allows the first pole of the second battery to be easily connected to the battery main control box with a lead wire, thereby improving the convenience of wiring between the second battery and the battery main control box. The fourth connector allows one end of the second electrical load to be easily connected to the battery main control box, thereby improving the convenience of wiring between the second electrical load and the battery main control box.

[0014] In some embodiments of this application, the battery main control box further includes a fifth connector and a sixth connector, the second pole line being connected to the fifth connector and the sixth connector, respectively, the fifth connector being for connection to the second pole of the first battery and the second pole of the second battery, and the sixth connector being for connection to the first electrical load and the second electrical load.

[0015] The fifth connector allows the second terminal of the first battery and the second terminal of the second battery to be easily connected to the battery main control box with lead wires, thereby improving the convenience of wiring between the first and second batteries and the battery main control box. The sixth connector allows the other end of the first electrical load and the other end of the second electrical load to be easily connected to the battery main control box, thereby improving the convenience of wiring between the first and second electrical loads and the battery main control box.

[0016] In some embodiments of this application, a first switch is connected between the first end of the first pole first line and the first end of the first pole second line, the fifth connector includes a first subconnector and a second subconnector, the sixth connector includes a third subconnector and a fourth subconnector, and both the first subconnector and the second subconnector are connected to the first end of the second pole line. Both the third subconnector and the fourth subconnector are connected to the second end of the second pole line.

[0017] The first and second subconnectors allow the negative terminals of the first and second batteries to be easily connected by the battery main control box, simplifying wiring. The third and fourth subconnectors allow the lead wires of the first and second electrical loads to be easily and flexibly connected by the battery main control box, simplifying wiring.

[0018] In some embodiments of this application, a third switch is provided in the first line of the first pole, a fourth switch is provided in the second line of the first pole, and a fifth switch is provided in the second line of the second pole.

[0019] By providing a switch on each line, the opening and closing of each switch can be controlled to more easily disconnect and connect each line. This allows for more flexible control of power supply to the lines, and in the event of a circuit malfunction, the connection between the battery and other components can be disconnected in a timely manner, thus protecting the battery and the entire circuit.

[0020] In some embodiments of this application, the first pole first line is provided with a first current sensor connected in series with the third switch.

[0021] Current sensors detect the magnitude of the current flowing through a line, which helps determine whether a fault has occurred in the circuit based on the detected current, and allows for adjustments to several control flows based on the current.

[0022] In some embodiments of this application, the first pole second line is provided with a second current sensor connected in series with the fourth switch.

[0023] Current sensors detect the magnitude of the current flowing through a line, which helps determine whether a fault has occurred in the circuit based on the detected current, and allows for adjustments to several control flows based on the current.

[0024] In some embodiments of this application, the first line of the first pole is provided with a first precharge circuit connected in parallel with the third switch, and the second line of the first pole is provided with a second precharge circuit connected in parallel with the fourth switch.

[0025] The first pre-charge circuit and the second pre-charge circuit protect the first pole first line and the third switch, and can avoid the current being too large when the loop is first formed and damaging the first pole first line and the third switch.

[0026] In some embodiments of the present application, a third pre-charge circuit connected in parallel with the fifth switch is provided on the second pole line.

[0027] The third pre-charge circuit protects the second pole line and the fifth switch, and can avoid the current being too large when the loop is first formed and damaging the second pole line and the fifth switch.

[0028] In the second aspect of the embodiments of the present application, it includes a power supply module, a first drive assembly, a second drive assembly and a sixth switch. The power supply module includes a first battery, a second battery, and a battery main control box described in any embodiment of the first aspect. The two first pole lines are the first pole first line and the first pole second line respectively. The first drive assembly is respectively connected to the second end of the first pole first line and the second end of the second pole line. The second drive assembly is respectively connected to the second end of the first pole second line and the second end of the second pole line. One end of the sixth switch is connected to the first drive assembly, and the other end of the sixth switch is connected to the second drive assembly, providing a charge-discharge circuit.

[0029] Through the automatic control of the switch elements in the charge-discharge circuit, by turning on or off the switch elements, flexible switching between different circuit loops can be realized, thereby realizing more functions, improving the flexibility and fault tolerance of the charge-discharge circuit control, and increasing the functions that can be realized in the entire circuit architecture.

[0030] In some embodiments of this application, one end of the sixth switch is connected to the neutral point of the motor in the first drive assembly, and the other end of the sixth switch is connected to the neutral point of the motor in the second drive assembly.

[0031] Automatic control of the switching elements within the charge / discharge circuit enables flexible switching between different circuit loops by turning the switching elements on or off. This allows for the implementation of more functions, improves the flexibility and fault tolerance of charge / discharge circuit control, and increases the overall functionality that can be achieved in the circuit architecture.

[0032] In some embodiments of this application, the battery main control box further includes a first connector and a second connector, the first pole first line being connected to the first connector and the second connector, respectively, the first connector for connection to the first pole of the first battery and the second connector for connection to a first electrical load; the battery main control box further includes a third connector and a fourth connector, the first pole second line being connected to the third connector and the fourth connector, respectively, the third connector for connection to the first pole of the second battery and the fourth connector for connection to a second electrical load; the battery main control box further includes a fifth connector and a sixth connector, the second pole line being connected to the fifth connector and the sixth connector, respectively, the fifth connector for connection to the second pole of the first battery and the second pole of the second battery and the sixth connector for connection to a first electrical load and a second electrical load; the first drive assembly being connected to the second connector and the sixth connector, respectively, and the second drive assembly being connected to the fourth connector and the sixth connector, respectively.

[0033] In some embodiments of this application, a first neutral wire terminal is provided at the neutral point of the motor in the first drive assembly, a second neutral wire terminal is provided at the neutral point of the motor in the second drive assembly, one end of the sixth switch is connected to the first neutral wire terminal via a high-voltage wire harness, and the other end of the sixth switch is connected to the second neutral wire terminal via a high-voltage wire harness.

[0034] This allows the sixth switch to be easily connected via lead wires between the neutral point of the motor in the first drive assembly and the neutral point of the motor in the second drive assembly. During wiring, it is not necessary to remove the motor housings in the first drive assembly and the second drive assembly to locate the neutral point, improving the convenience and efficiency of wiring.

[0035] In some embodiments of this application, the charge / discharge circuit further includes an energy storage element connected to a line between the neutral point of the motor in the first drive assembly and the neutral point of the motor in the second drive assembly, and connected in series with the sixth switch.

[0036] By adding the energy storage element, in a scenario where the battery is heated, the energy storage element stores electrical energy together with the motor windings in the first drive assembly and the motor in the second drive assembly, increasing the overall energy storage capacity of the circuit system. The stored electrical energy is then used to charge the battery, and the battery is heated by alternating charging and discharging cycles. The energy storage element increases the magnitude of the alternating current generated throughout the loop, increasing the heat generated by the battery's internal resistance per unit time, and thus accelerating the battery's heating rate.

[0037] In some embodiments of this application, the energy storage element includes at least one inductor, and the at least one inductor and the sixth switch are connected in series to a line between the neutral point of the motor in the first drive assembly and the neutral point of the motor in the second drive assembly.

[0038] At least one inductor is connected in series between the neutral points of the first motor and the second motor. The series-connected inductors can increase the total inductance of the entire circuit system in the battery heating scenario, contributing to an improvement in the magnitude of the AC current generated in the charge / discharge circuit and an improvement in battery heating efficiency.

[0039] In a third embodiment of the embodiments of this application, an electrical device is provided comprising a control device and a charge / discharge circuit as described in any embodiment of the second embodiment, wherein the control device is communicated to a switch element in the charge / discharge circuit, and the switch element includes at least the first switch and the sixth switch.

[0040] The automatic control of the switch elements within the charge / discharge circuit by the control device enables flexible switching between different circuit loops by turning the switch elements on or off. This allows for the implementation of more functions, improves the flexibility and fault tolerance of charge / discharge circuit control, increases the overall functionality of the circuit architecture, and enhances the performance of electrical equipment.

[0041] The above description is merely a general overview of the technical solutions of the embodiments of this application. In order to more clearly understand the technical means of the embodiments of this application and to implement them based on the contents of the specification, and to make the above and other objectives, features, and benefits of the embodiments of this application easier to understand, specific embodiments of this application are given below.

[0042] By reviewing the detailed description of the embodiments below, various other advantages and benefits will become obvious to those skilled in the art. The drawings are for illustrative purposes only and should not be construed as limiting this application. Throughout the drawings, the same reference numerals indicate the same components. [Brief explanation of the drawing]

[0043] [Figure 1] This is a schematic diagram of the structure of a vehicle according to one or more embodiments. [Figure 2] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 3] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 4] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 5] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 6] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 7] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 8] This is a schematic diagram of the structure of a battery main control box according to one or more embodiments. [Figure 9] This is a schematic diagram of the structure of a charge / discharge circuit according to one or more embodiments. [Figure 10] This is a schematic diagram of the structure of a charge / discharge circuit according to one or more embodiments. [Figure 11] This is a schematic diagram of the structure of a charge / discharge circuit according to one or more embodiments. [Figure 12] This is a schematic diagram of the structure of a charge / discharge circuit according to one or more embodiments. [Figure 13] This is a schematic diagram of the structure of a charge / discharge circuit according to one or more embodiments. [Figure 14] This is a schematic diagram of the structure of an electrical device relating to one or more embodiments. [Modes for carrying out the invention]

[0044] The following examples of embodiments of the technical solution of this application will be described in detail with reference to the drawings. The following embodiments are used solely to illustrate the technical solution of this application more clearly and are merely examples; they should not limit the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. Terms used herein are solely for the purpose of describing specific embodiments and are not intended to limit this application. Terms such as “including,” “having,” and any variations thereof in the description of the specification, claims, and drawings herein are intended to cover the non-exclusive “including.”

[0046] In the descriptions of the embodiments of this application, technical terms such as "first," "second," etc., are merely used to distinguish different subjects and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features shown, a specific order, or a primary-secondary relationship. In the descriptions of the embodiments of this application, unless otherwise clearly and specifically limited, "multiple" means two or more.

[0047] Where the “Examples” are described herein, it means that the specific features, structures, or properties described by the Examples may be included in at least one Example of this Application. The phrase “Examples” appearing in different parts of the Specification does not necessarily refer to the same Example, nor does it refer to an Example that is exclusively independent or alternative to another Example. It will be understood expressly or implicitly by those skilled in the art that the Examples described herein may be combined with other Examples.

[0048] In the description of the embodiments of this application, the term "and / or" is merely used to describe the relationship between related objects, and indicates that there may be three such relationships. For example, A and / or B can represent the cases where A exists, where A and B exist simultaneously, or where B exists. Furthermore, the symbol " / " in this specification generally means that the preceding and following related objects are in an "or" relationship.

[0049] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more sheets (including two sheets).

[0050] In the description of the embodiments of this application, the orientations or positional relationships indicated by technical terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are merely for the purpose of making the embodiments of this application easier to explain and simplifying the description. They do not explicitly or implicitly suggest that the shown devices or elements necessarily have a specific orientation, or are composed and operated in a specific orientation, and should not be understood as limiting the embodiments of this application.

[0051] In the descriptions of the embodiments of this application, unless otherwise explicitly specified or limited, technical terms such as "attach," "connect," "join," and "fix" should be understood in a broad sense. For example, they may refer to fixed connections, removable connections, or integration. They may also refer to mechanical or electrical connections. Furthermore, they may refer to direct connections, indirect connections via an intermediate mediator, internal communication between two elements, or interaction relationships between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

[0052] With the continued development of new energy technologies, new energy modes of transport, particularly new energy electrical equipment such as electric vehicles, widely use power batteries as their power source.

[0053] New energy electrical equipment generally uses a structure that combines a battery and a dual-motor architecture. The dual-motor architecture includes two motors connected in parallel, and the electrical energy released from the battery is converted into mechanical energy by the two motors to drive and move the new energy transportation. The battery main control box is for controlling the battery, and in the battery main control box of related technologies, the circuit structure in which the battery is located cannot be changed, the circuit connection method is fixed, and it is not possible to flexibly change the circuit structure to realize more functions.

[0054] Regarding the problems present in related technologies, the embodiments of this application provide a battery main control box comprising two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines, the two first electrode lines being for connection to two electrical loads and two batteries, respectively, and the second electrode line being for connection to the two electrical loads and two batteries, respectively. The battery main control box of the embodiments of this application comprises two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines, and by controlling the opening and closing of the switch, the circuit structure in which the battery is located can be changed, thereby flexibly changing the circuit structure and realizing more functions.

[0055] The battery in the embodiment of this application may include a battery cell, a battery module, or a battery pack, and the embodiment of this application is not limited in terms of the size of the battery. The battery may be a power battery such as a lithium battery, a lead-acid battery, a nickel-cadmium battery, or a sodium-sulfur battery.

[0056] Embodiments of the present application further provide a charge / discharge circuit comprising a power supply module, a first drive assembly, a second drive assembly, and a sixth switch, wherein the power supply module comprises a first battery, a second battery, and the battery main control box, the two first pole lines being a first pole first line and a first pole second line, the first drive assembly being connected to the second end of the first pole first line and the second end of the second pole line, the second drive assembly being connected to the second end of the first pole second line and the second end of the second pole line, one end of the sixth switch being connected to the first drive assembly, and the other end of the sixth switch being connected to the second drive assembly.

[0057] The charge / discharge circuit of the embodiment of this application can achieve flexible switching between different circuit loops by automatically controlling the switch elements within the charge / discharge circuit to turn the switch elements on or off. This enables more functionality, improves the flexibility and fault tolerance of the charge / discharge circuit control, and increases the functionality that can be achieved in the overall circuit architecture.

[0058] Embodiments of this application further provide electrical equipment using the above-described charge / discharge circuit, which may be, but is not limited to, electric toys, power tools, electric motorcycles, electric vehicles, ships, aircraft, etc. Electrical equipment uses the charge / discharge circuit disclosed in this application, thereby enabling automatic control of the switch elements within the charge / discharge circuit as needed, and enabling flexible switching between different circuit loops by turning the switch elements on or off, thereby enabling more functions, improving the flexibility and fault tolerance of charge / discharge circuit control, and increasing the functions that can be realized in the overall circuit architecture, by flexibly switching the charge / discharge circuit to configure different circuit loops and realize different functions.

[0059] In the following embodiments, for the sake of clarity, the electrical equipment in one embodiment of this application will be described as a vehicle 1000.

[0060] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application, the vehicle 1000 may be a new energy vehicle, which may be a battery-powered vehicle or a range-extender vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, and for example, the battery 100 can be the operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 for controlling the battery 100 to supply power to the motor 300, and is used, for example, to meet the operating power requirements for starting, navigating, and driving the vehicle 1000.

[0061] Battery 100 can also provide driving power to vehicle 1000 as a power source for vehicle 1000. Motor 300 converts the electrical energy output from battery 100 into mechanical energy and drives vehicle 1000 to move.

[0062] In actual applications, the number of motors 300 may be one or two, etc. The charge / discharge circuit provided in the embodiment of this application is applicable when the vehicle 1000 has two batteries 100 and two motors 300.

[0063] In some embodiments of this application, with reference to Figure 2 showing a battery main control box 1, the battery main control box 1 includes two first pole lines and one second pole line 4, the two first pole lines being the first pole first line 2 and the first pole second line 3, respectively. A first switch 5 is connected between the two first pole lines. The two first pole lines are for connecting to two electrical loads and two batteries, respectively, and the second pole line 4 is for connecting to the two electrical loads and the two batteries, respectively.

[0064] The battery main control box 1 of the embodiment of this application includes two first electrode lines and one second electrode line, with a switch connected between the two first electrode lines. By controlling the opening and closing of the switch, the circuit structure in which the battery is located can be changed, allowing for flexible modification of the circuit structure and enabling more functions.

[0065] Specifically, in some examples, as shown in Figure 2, the battery main control box 1 includes a first pole first line 2, a first pole second line 3, and a second pole line 4. The first pole first line 2 is connected to the first electrical load and the first pole of the first battery 21, respectively. The first pole second line 3 is connected to the second electrical load and the first pole of the second battery 22, respectively. The second pole line 4 is connected to the first electrical load, the second electrical load, the second pole of the first battery 21, and the second pole of the second battery 22, respectively. The first pole is either the positive or negative pole, and the second pole is the pole other than the first pole among the positive and negative poles. A first switch 5 is connected between the first end of the first pole first line 2 and the first end of the first pole second line 3.

[0066] In one specific example, the first pole is the positive pole and the second pole is the negative pole. The first line 2 of the first pole is connected to the positive pole of the first battery 21, the second line 3 of the first pole is connected to the positive pole of the second battery 22, and the second line 4 of the second pole is connected to the negative pole of the first battery 21 and the negative pole of the second battery 22.

[0067] In one specific example, the first pole is the negative pole and the second pole is the positive pole. The first line 2 of the first pole is connected to the negative pole of the first battery 21, the second line 3 of the first pole is connected to the negative pole of the second battery 22, and the second line 4 of the second pole is connected to the positive pole of the first battery 21 and the positive pole of the second battery 22.

[0068] The first electrical load may be, for example, one motor in a dual-motor architecture, and the second electrical load may be, for example, the other motor in a dual-motor architecture.

[0069] The battery main control box 1 can change the circuit structure in which the battery is located by controlling the opening and closing of the first switch 5, thereby flexibly changing the circuit structure and realizing more functions. This significantly improves upon the situation in related technologies where the battery main control box cannot change the circuit structure in which the battery is located, the circuit connection method is fixed, and it is not possible to flexibly change the circuit structure to realize more functions.

[0070] In some embodiments of this application, as shown in Figure 3, the battery main control box 1 further includes a first connector 6 and a second connector 7. The first pole first line 2 is connected to the first connector 6 and the second connector 7, respectively, with the first connector 6 being for connection to the first pole of the first battery 21 and the second connector 7 being for connection to the first electrical load.

[0071] The first connector 6 allows the first pole of the first battery 21 to be easily connected to the battery main control box 1 with a lead wire, thereby improving the convenience of wiring between each battery and the battery main control box 1. The second connector 7 allows the first electrical load to be easily connected to the battery main control box 1, thereby improving the convenience of wiring between the first electrical load and the battery main control box.

[0072] The battery main control box 1 further includes a third connector 8 and a fourth connector 9. The first pole second line 3 is connected to the third connector 8 and the fourth connector 9, respectively, with the third connector 8 being for connection to the first pole of the second battery 22 and the fourth connector 9 being for connection to the second electrical load.

[0073] The third connector 8 allows the first pole of the second battery 22 to be easily connected to the battery main control box 1 with a lead wire, thereby improving the convenience of wiring between the second battery 22 and the battery main control box 1. The fourth connector 9 allows one end of the second electrical load to be easily connected to the battery main control box 1, thereby improving the convenience of wiring between the second electrical load and the battery main control box 1.

[0074] The battery main control box 1 further includes a fifth connector 10 and a sixth connector 11. The second pole line 4 is connected to the fifth connector 10 and the sixth connector 11, respectively, with the fifth connector 10 for connection to the second pole of the first battery 21 and the second pole of the second battery 22, and the sixth connector 11 for connection to the first and second electrical loads.

[0075] The fifth connector 10 allows the second pole of the first battery 21 and the second pole of the second battery 22 to be easily connected to the battery main control box 1 with lead wires, thereby improving the convenience of wiring between the first battery 21 and the second battery 22 and the battery main control box 1. The sixth connector 11 allows the other end of the first electrical load and the other end of the second electrical load to be easily connected to the battery main control box 1, thereby improving the convenience of wiring between the first electrical load and the second electrical load and the battery main control box 1.

[0076] In some embodiments of this application, as shown in Figure 4, a third switch 13 is provided on the first line 2 of the first pole, a fourth switch 14 is provided on the second line 3 of the first pole, and a fifth switch 15 is provided on the second line 4 of the second pole.

[0077] By providing a switch on each line, the opening and closing of each switch can be controlled to more easily disconnect and connect each line. This allows for more flexible control of power supply to the lines, and in the event of a circuit malfunction, the connection between the battery and other components can be disconnected in a timely manner, thus protecting the battery and the entire circuit.

[0078] In some embodiments of this application, as shown in Figure 5, a first current sensor 16 is provided in series with a third switch 13 on the first pole first line 2, and a second current sensor 17 is provided in series with a fourth switch 14 on the first pole second line 3. The first current sensor 16 is for detecting the current in the first pole first line 2, and the second current sensor 17 is for detecting the current in the first pole second line 3. The current sensors detect the magnitude of the current flowing through the lines, which helps to determine whether a fault has occurred in the circuit based on the detected current, and allows for adjustment of several control flows based on the current.

[0079] In some embodiments of this application, as shown in Figure 6, the first pole first line 2 is provided with a first precharge circuit 18 connected in parallel with the third switch 13, the second pole second line 3 is provided with a second precharge circuit 19 connected in parallel with the fourth switch 14, and the second pole line 4 is provided with a third precharge circuit 20 connected in parallel with the fifth switch 15. The first precharge circuit 18 includes one precharge switch and one register R connected in series, the second precharge circuit 19 includes one precharge switch and one register R connected in series, and the third precharge circuit 20 includes one precharge switch and one register R connected in series.

[0080] When the battery main control box 1 controls the connection of the battery to the circuit, it first opens the third switch 13, then the fourth switch 14, then the fifth switch 15, connects the first precharge circuit 18, then the second precharge circuit 19, and then the third precharge circuit 20 to prevent the current in the lines from being too high and damaging the lines initially. After the current in the entire circuit stabilizes, it can then turn on the third switch 13, the fourth switch 14, and the fifth switch 15 to disconnect the first precharge circuit 18, the second precharge circuit 19, and the third precharge circuit 20, thereby ensuring the safety of the circuit. The first and second precharge circuits protect the first pole line and the third switch, preventing the current from being too high and damaging the first pole line and the third switch when a loop is first formed. The third precharge circuit protects the second pole line and the fifth switch, preventing the current from being too high and damaging the second pole line and the fifth switch when a loop is first formed.

[0081] In some embodiments of this application, as shown in Figure 7, the fifth connector 10 includes a first subconnector 101 and a second subconnector 102. The sixth connector 11 includes a third subconnector 111 and a fourth subconnector 112. Both the first subconnector 101 and the second subconnector 102 are connected to the first end of the second pole line 4, and both the third subconnector 111 and the fourth subconnector 112 are connected to the second end of the second pole line 4.

[0082] The first subconnector 101 and the second subconnector 102 allow the negative terminals of the first battery 21 and the second battery 22 to be easily connected by the battery main control box 1, simplifying wiring. If the negative terminals of the first battery 21 and the second battery 22 were connected to the same connector, a failure of that connector would affect both the first battery 21 and the second battery 22 simultaneously. By connecting the first battery 21 and the second battery 22 using the first subconnector 101 and the second subconnector 102, the probability of the negative terminals of the first battery 21 and the second battery 22 being affected by the same connector is reduced, thereby reducing the probability of failure.

[0083] The third subconnector 111 and the fourth subconnector 112 allow the lead wires of the first electrical load and the lead wires of the second electrical load to be easily connected by the battery main control box 1, simplifying wiring. If the first and second electrical loads are connected to the same connector, a failure of that connector will affect the operation of both the first and second electrical loads simultaneously. By connecting the first and second electrical loads using the third subconnector 111 and the fourth subconnector 112, the probability of both loads being affected by the same connector is reduced, thereby reducing the probability of failure.

[0084] The descriptions of each embodiment described above tend to emphasize the differences between them, and the same or similar content can be referenced to one another. For the sake of brevity, detailed explanations are omitted here.

[0085] In some embodiments of this application, as shown in Figure 8, the battery main control box 1 includes a first pole first line 2, a first pole second line 3, and a second pole line 4. The first pole first line 2 is connected to the first electrical load and the first pole of the first battery 21, respectively. The first pole second line 3 is connected to the second electrical load and the first pole of the second battery 22, respectively. The second pole line 4 is connected to the first electrical load, the second electrical load, the second pole of the first battery 21, and the second pole of the second battery 22, respectively. The first pole is either a positive or negative pole, and the second pole is a pole other than the first pole among the positive and negative poles. A first switch 5 is connected between the first end of the first pole first line 2 and the first end of the first pole second line 3.

[0086] The battery main control box 1 further includes a first connector 6, a second connector 7, a third connector 8, a fourth connector 9, a fifth connector 10, and a sixth connector 11. Here, the first pole first line 2 is connected to the first connector 6 and the second connector 7, respectively, with the first connector 6 being for connection to the first pole of the first battery 21 and the second connector 7 being for connection to the first electrical load; the first pole second line 3 is connected to the third connector 8 and the fourth connector 9, respectively, with the third connector 8 being for connection to the first pole of the second battery 22 and the fourth connector 9 being for connection to the second electrical load; the second pole line 4 is connected to the fifth connector 10 and the sixth connector 11, respectively, with the fifth connector 10 being for connection to the second pole of the first battery 21 and the second pole of the second battery 22, and the sixth connector 11 being for connection to the first and second electrical loads.

[0087] A third switch 13 is provided on the first line 2 of the first pole, a fourth switch 14 is provided on the second line 3 of the first pole, and a fifth switch 15 is provided on the second line 4 of the second pole. A first current sensor 16 is provided on the first line 2 of the first pole, connected in series with the third switch 13, and a second current sensor 17 is provided on the second line 3 of the first pole, connected in series with the fourth switch 14. A first precharge circuit 18 is provided on the first line 2 of the first pole, connected in parallel with the third switch 13, a second precharge circuit 19 is provided on the second line 3 of the first pole, connected in parallel with the fourth switch 14, and a third precharge circuit 20 is provided on the second line 4 of the second pole, connected in parallel with the fifth switch 15.

[0088] The fifth connector 10 includes a first subconnector 101 and a second subconnector 102. The sixth connector 11 includes a third subconnector 111 and a fourth subconnector 112. Both the first subconnector 101 and the second subconnector 102 are connected to the first end of the second pole line 4, and both the third subconnector 111 and the fourth subconnector 112 are connected to the second end of the second pole line 4.

[0089] The battery main control box 1 can change the circuit structure in which the battery is located by controlling the opening and closing of the first switch 5, thereby flexibly changing the circuit structure and enabling more functions.

[0090] The descriptions of each embodiment described above tend to emphasize the differences between them, and the same or similar content can be referenced to one another. For the sake of brevity, detailed explanations are omitted here.

[0091] Several embodiments of this application provide a charge / discharge circuit, as shown in Figure 9, which includes a power supply module, a first drive assembly 23, a second drive assembly 24, and a sixth switch 25. The power supply module includes a first battery 21, a second battery 22, and a battery main control box 1 of any of the embodiments described above. The first drive assembly 23 is connected to the second end of the first pole first line 2 and the second end of the second pole line 4, respectively; the second drive assembly 24 is connected to the second end of the first pole second line 3 and the second end of the second pole line 4, respectively; one end of the sixth switch 25 is connected to the first drive assembly 23, and the other end of the sixth switch 25 is connected to the second drive assembly 24. The charge / discharge circuits of the embodiments of this application can achieve the beneficial technical effects that can be achieved by the battery main control box 1 of any of the embodiments described above, and can flexibly switch the charge / discharge circuits to configure different circuit loops and realize different functions.

[0092] Specifically, in some examples, one end of the sixth switch 25 is connected to the neutral point of the motor in the first drive assembly 23, and the other end of the sixth switch 25 is connected to the neutral point of the motor in the second drive assembly 24. The first pole of the first battery 21 is connected to the first end of the first pole first line 2, and the first pole of the second battery 22 is connected to the first end of the first pole second line 3. The second pole of the first battery 21 and the second pole of the second battery 22 are both connected to the first end of the second pole line 4. The first pole is either the positive or negative pole, and the second pole is the pole other than the first pole among the positive and negative poles.

[0093] Automatic control of the switching elements within the charge / discharge circuit enables flexible switching between different circuit loops by turning the switching elements on or off. This allows for the implementation of more functions, improves the flexibility and fault tolerance of charge / discharge circuit control, and increases the overall functionality that can be achieved in the circuit architecture.

[0094] As shown in Figure 10, in some embodiments of this application, the first drive assembly 23 is connected to the second connector 7 and the sixth connector 11, respectively, and the second drive assembly 24 is connected to the fourth connector 9 and the sixth connector 11, respectively. The first pole of the first battery 21 is connected to the first connector 6, the second pole of the first battery 21 is connected to the fifth connector 10, the first pole of the second battery 22 is connected to the third connector 8, and the second pole of the second battery 22 is connected to the fifth connector 10.

[0095] In some embodiments of this application, as shown in Figure 11, a first neutral wire terminal 26 is provided at the neutral point of the motor in the first drive assembly 23, a second neutral wire terminal 27 is provided at the neutral point of the motor in the second drive assembly 24, one end of the sixth switch 25 is connected to the first neutral wire terminal 26 via a high-voltage wire harness, and the other end of the sixth switch 25 is connected to the second neutral wire terminal 27 via a high-voltage wire harness.

[0096] This allows the sixth switch 25 to be easily connected by lead wire between the neutral point of the motor in the first drive assembly 23 and the neutral point of the motor in the second drive assembly 24. During wiring, it is not necessary to remove the motor housings in the first drive assembly 23 and the second drive assembly 24 to locate the neutral point, improving the convenience and efficiency of wiring.

[0097] In some embodiments of this application, as shown in Figure 12, the charge / discharge circuit further includes an energy storage element, which is connected in series with a sixth switch 25 and connected to a line between the neutral point of a motor in a first drive assembly 23 and the neutral point of a motor in a second drive assembly 24. The energy storage element includes at least one inductor L, and at least one inductor L and the sixth switch 25 are connected in series with a line between the neutral point of a first motor and the neutral point of a second motor.

[0098] By adding the energy storage element, in a scenario where the battery is heated, the energy storage element stores electrical energy together with the motor windings in the first drive assembly and the motor in the second drive assembly, increasing the overall energy storage capacity of the circuit system. The stored electrical energy is then used to charge the battery, and the battery is heated by alternating charging and discharging cycles. The energy storage element increases the magnitude of the alternating current generated throughout the loop, increasing the heat generated by the battery's internal resistance per unit time, and thus accelerating the battery's heating rate.

[0099] The descriptions of each embodiment described above tend to emphasize the differences between them, and the same or similar content can be referenced to one another. For the sake of brevity, detailed explanations are omitted here.

[0100] In some embodiments of this application, as shown in Figure 13, the charge / discharge circuit includes a first battery 21, a second battery 22, a first drive assembly 23, a second drive assembly 24, and a battery main control box 1.

[0101] The battery main control box 1 includes a first pole first line 2, a first pole second line 3, and a second pole line 4. The first pole first line 2 is connected to the first electrical load and the first pole of the first battery 21, respectively. The first pole second line 3 is connected to the second electrical load and the first pole of the second battery 22, respectively. The second pole line 4 is connected to the first electrical load, the second electrical load, the second pole of the first battery 21, and the second pole of the second battery 22, respectively. The first pole is the positive pole, and the second pole is the negative pole. A first switch 5 is connected between the first end of the first pole first line 2 and the first end of the first pole second line 3.

[0102] The battery main control box 1 further includes a first connector 6, a second connector 7, a third connector 8, a fourth connector 9, a fifth connector 10, and a sixth connector 11. Here, the first pole first line 2 is connected to the first connector 6 and the second connector 7, respectively, with the first connector 6 being for connection to the first pole of the first battery 21 and the second connector 7 being for connection to the first electrical load; the first pole second line 3 is connected to the third connector 8 and the fourth connector 9, respectively, with the third connector 8 being for connection to the first pole of the second battery 22 and the fourth connector 9 being for connection to the second electrical load; the second pole line 4 is connected to the fifth connector 10 and the sixth connector 11, respectively, with the fifth connector 10 being for connection to the second pole of the first battery 21 and the second pole of the second battery 22, and the sixth connector 11 being for connection to the first and second electrical loads.

[0103] A third switch 13 is provided on the first line 2 of the first pole, a fourth switch 14 is provided on the second line 3 of the first pole, and a fifth switch 15 is provided on the second line 4 of the second pole. A first current sensor 16 is provided on the first line 2 of the first pole, connected in series with the third switch 13, and a second current sensor 17 is provided on the second line 3 of the first pole, connected in series with the fourth switch 14. A first precharge circuit 18 is provided on the first line 2 of the first pole, connected in parallel with the third switch 13, a second precharge circuit 19 is provided on the second line 3 of the first pole, connected in parallel with the fourth switch 14, and a third precharge circuit 20 is provided on the second line 4 of the second pole, connected in parallel with the fifth switch 15.

[0104] The fifth connector 10 includes a first subconnector 101 and a second subconnector 102. Both the first subconnector 101 and the second subconnector 102 are connected to the first end of the second pole line 4, and the first subconnector 101 and the second subconnector 102 allow the negative terminal of the first battery 21 and the negative terminal of the second battery 22 to be easily connected by the battery main control box 1, making wiring easy. The sixth connector 11 includes a third subconnector 111 and a fourth subconnector 112. Both the third subconnector 111 and the fourth subconnector 112 are connected to the second end of the second pole line 4. The third subconnector 111 and the fourth subconnector 112 allow the lead wires of the first electrical load and the lead wires of the second electrical load to be easily and flexibly connected by the battery main control box 1, making wiring easy.

[0105] The first drive assembly 23 includes a first motor controller 231 and a first motor 232 connected to the first motor controller 231. The upper bridge arm of each bridge arm of the first motor controller 231 is connected to the same lead wire, which can be the first end of the first drive assembly 23. The lower bridge arm of each bridge arm of the first motor controller 231 is connected to the same lead wire, which can be the second end of the first drive assembly 23. The first and second ends of the second drive assembly 24 have the same structure as the first and second ends of the first drive assembly 23, and a detailed explanation is omitted here.

[0106] Here, the first motor controller 231 has three bridge arms, and the first motor 232 has three windings. The second motor controller 241 included in the second drive assembly 24 has three bridge arms, and the second motor 242 has three windings. In practical applications, the two motors may have any number of phases, and the number of bridge arms in the corresponding motor controllers may also be other numbers.

[0107] The battery main control box 1 is for controlling the connections between the first battery 21 and the second battery 22 and the first drive assembly 23 and the second drive assembly 24. The battery main control box 1 can also be used to detect the magnitude of the current flowing through the first pole first line 2 or the first pole second line 3, or to detect the magnitude of the voltage at the positive and negative terminals of the first battery 21 or the second battery 22.

[0108] Specifically, the first end of the first motor controller 231 in the first drive assembly 23 is connected to the third connector 8, and the second end of the first motor controller 231 is connected to the third sub-connector 111. The upper bridge arms of each bridge arm in the first motor controller 231 are connected in a straight line, and each upper bridge arm is connected to each other and connected to the third connector 8. The lower bridge arms of each bridge arm are connected in a straight line, and each lower bridge arm is connected to each other and connected to the third sub-connector 111.

[0109] In the second drive assembly 24, the first end of the second motor controller 241 is connected to the fourth connector 9, and the second end of the second motor controller 241 is connected to the fourth subconnector 112. The upper bridge arms of each bridge arm in the second motor controller 241 are connected in a straight line, and each upper bridge arm is connected to each other and connected to the fourth connector 9. The lower bridge arms of each bridge arm are connected in a straight line, and each lower bridge arm is connected to each other and connected to the fourth subconnector 112.

[0110] A first neutral wire terminal 26 is provided at the neutral point of the first motor 232, and a second neutral wire terminal 27 is provided at the neutral point of the second motor 242. One end of the sixth switch 25 is connected to the first neutral wire terminal 26 via a high-voltage wire harness, and the other end of the sixth switch 25 is connected to the second neutral wire terminal 27 via a high-voltage wire harness.

[0111] This allows the sixth switch 25 to be easily connected with a lead wire between the neutral point of the first motor 232 and the neutral point of the second motor 242. During wiring, it is not necessary to remove the housings of the first motor 232 and the second motor 242 to locate the neutral point, improving the convenience and efficiency of wiring.

[0112] The charge / discharge circuit further includes an energy storage element, which includes one inductor L, and the inductor L and the sixth switch 25 are connected in series to the line between the neutral point of the first motor 232 and the neutral point of the second motor 242. By adding the energy storage element, in a battery heating scenario, the energy storage element can store electrical energy together with the windings in the first and second motors, increasing the total energy storage capacity of the circuit system, and the stored electrical energy can be used to charge the battery, achieving battery heating by alternating charging and discharging. The energy storage element can increase the magnitude of the alternating current generated throughout the loop, increase the heat generated by the internal resistance of the battery per unit time, and speed up the battery heating rate. At least one inductor is connected in series between the neutral points of the first and second motors, and the series-connected inductors can increase the total inductance of the inductors throughout the circuit system in a battery heating scenario, contributing to an improvement in the magnitude of the alternating current generated in the charge / discharge circuit and an improvement in battery heating efficiency.

[0113] The first motor controller 231 has a capacitor C01 connected in parallel with each bridge arm, and the second motor controller 241 has a capacitor C02 connected in parallel with each bridge arm.

[0114] By controlling the opening and closing of the first switch 5, the circuit structure in which the battery is located can be changed, allowing for flexible modification of the circuit structure and enabling a wider range of functions.

[0115] For example, by controlling the first switch 5 to close, controlling the sixth switch 25 to close, controlling all upper bridge arms of the first motor controller 231 to turn on, controlling all lower bridge arms of the first motor controller 231 to turn off, controlling all lower bridge arms of the second motor controller 241 to turn on, and controlling all upper bridge arms of the second motor controller 241 to turn off, two loops can be formed. In one of these loops, current flows sequentially through the positive terminal of the first battery 21, the first line 2 of the first pole, the first motor controller 231, the first motor 232, the inductor L, the second motor 242, the second motor controller 241, the fourth subconnector 112, the second line 4 of the second pole, the first subconnector 101, and the negative terminal of the first battery 21. In another loop, current flows sequentially through the positive terminal of the second battery 22, the first switch 5, the first line 2 of the first pole, the first motor controller 231, the first motor 232, the inductor L, the second motor 242, the second motor controller 241, the fourth subconnector 112, the second line 4, the second subconnector 102, and the negative terminal of the second battery 22. This allows the first battery 21 and the second battery 22 to self-heat simultaneously.

[0116] For example, by controlling the first switch 5 to open, the sixth switch 25 to close, controlling all upper bridge arms of the first motor controller 231 to turn off, controlling all lower bridge arms of the first motor controller 231 to turn on, controlling all lower bridge arms of the second motor controller 241 to turn off, and controlling all upper bridge arms of the second motor controller 241 to turn on, a self-heating loop of the second battery 22 can be formed. Current flows sequentially through the positive terminal of the second battery 22, the first pole second line 3, the second motor controller 241, the second motor 242, the inductor L, the first motor 232, the first motor controller 231, the third sub-connector 111, the second pole line 4, the second sub-connector 102, and the negative terminal of the second battery 22, forming a self-heating loop of the second battery 22 and realizing self-heating of the second battery 22.

[0117] Furthermore, depending on the actual application needs, the switches of the entire circuit can be controlled to realize different circuits, which greatly improves the flexibility of the circuit structure.

[0118] The descriptions of each embodiment described above tend to emphasize the differences between them, and the same or similar content can be referenced to one another. For the sake of brevity, detailed explanations are omitted here.

[0119] Another embodiment of the present application provides an electrical device, as shown in Figure 14, which includes a control device 30 and a charge / discharge circuit 400 provided in any of the above embodiments, wherein the control device 30 is communicated to a switch element in the charge / discharge circuit 400, and the switch element includes at least a first switch 5 and a sixth switch 25.

[0120] The above-mentioned switch elements may further include switches provided in the battery main control box 1 and switches in the bridge arms of the first motor controller 231 and the second motor controller 241. The control device 30 may be a motor controller, vehicle controller, or domain controller, etc. The electrical equipment may be any device including a single battery and dual motors, such as an electric vehicle, electric ship, or aircraft.

[0121] The automatic control of the switch elements within the charge / discharge circuit 400 by the control device 30 enables flexible switching between different circuit loops by turning the switch elements on or off. This allows for the implementation of more functions, improves the flexibility and fault tolerance of the charge / discharge circuit control, increases the overall functionality of the circuit architecture, and enhances the performance of electrical equipment.

[0122] The descriptions of each embodiment described above tend to emphasize the differences between them, and the same or similar content can be referenced to one another. For the sake of brevity, detailed explanations are omitted here.

[0123] It should be noted that the embodiments described above are merely representations of embodiments of the present application, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the patent of this application. It should be noted that all variations and improvements that a person skilled in the art can make without departing from the concept of this application are all within the scope of protection of this application. Accordingly, the scope of protection of this application shall be in accordance with the claims attached. [Explanation of symbols]

[0124] The meanings of the symbols in the drawings are as follows: 1000 vehicles 100 batteries 200 controllers 300 motor 400 charge / discharge circuit 1. Battery main control box 2. First pole, first line 3. First pole, second line 4. Second pole line 5. First switch 6. First connector 7. Second connector 8. Third connector 9. Fourth connector 10 Fifth connector 11. Connector No. 6 15. Fifth switch 16. First current sensor 17. Second current sensor 18. First pre-charge circuit 19. Second pre-charge circuit 20. Third pre-charge circuit 21. First Battery 22 Second Battery 23. First drive assembly 24. Second drive assembly 25. Switch 6 26 1st neutral wire terminal 27 2nd neutral wire terminal 30 Control device 101 First Subconnector 102 Second Subconnector 111 Third Subconnector 112 Fourth Subconnector 231 First Motor Controller 232 First Motor 241 Second Motor Controller 242 Second Motor

Claims

1. It includes two first pole lines and one second pole line, with a switch connected between the two first pole lines, the two first pole lines being the first pole line and the first pole line, the first pole line being connected to the first pole of the first electrical load and the first pole of the first battery, the first pole line being connected to the first pole of the second electrical load and the first pole of the second battery, the second pole line being connected to the first electrical load, the second electrical load, the second pole of the first battery, and the second pole of the second battery, the first pole being either the positive or negative pole, the second pole being the other pole among the positive and negative poles, A battery main control box in which a first switch is connected between the first line of the first pole and the second line of the first pole.

2. Further including a first connector and a second connector, The battery main control box according to claim 1, wherein the first pole first line is connected to the first connector and the second connector, respectively, the first connector being for connection to the first pole of the first battery and the second connector being for connection to the first electrical load.

3. Further including a third connector and a fourth connector, The battery main control box according to claim 1 or 2, wherein the first pole second line is connected to the third connector and the fourth connector, respectively, the third connector being for connection to the first pole of the second battery, and the fourth connector being for connection to the second electrical load.

4. Further including a fifth connector and a sixth connector, The battery main control box according to claim 1 or 2, wherein the second pole line is connected to the fifth connector and the sixth connector, respectively, the fifth connector being for connection to the second pole of the first battery and the second pole of the second battery, and the sixth connector being for connection to the first electrical load and the second electrical load.

5. A first switch is connected between the first end of the first line of the first pole and the first end of the second line of the first pole, and the fifth connector includes a first subconnector and a second subconnector. The sixth connector includes a third subconnector and a fourth subconnector. Both the first subconnector and the second subconnector are connected to the first end of the second pole line. The battery main control box according to claim 4, wherein both the third subconnector and the fourth subconnector are connected to the second end of the second pole line.

6. The battery main control box according to claim 1 or 2, wherein a third switch is provided on the first line of the first pole, a fourth switch is provided on the second line of the first pole, and a fifth switch is provided on the second line of the second pole.

7. The battery main control box according to claim 6, wherein the first pole first line is provided with a first current sensor connected in series with the third switch.

8. The battery main control box according to claim 6, wherein the first pole second line is provided with a second current sensor connected in series with the fourth switch.

9. The battery main control box according to claim 6, wherein the first line of the first pole is provided with a first precharge circuit connected in parallel with the third switch, and the second line of the first pole is provided with a second precharge circuit connected in parallel with the fourth switch.

10. The battery main control box according to claim 6, wherein the second electrode line is provided with a third pre-charge circuit connected in parallel with the fifth switch.

11. The power supply module includes a first drive assembly, a second drive assembly, and a sixth switch, wherein the power supply module includes a first battery, a second battery, and a battery main control box according to claim 1 or 2, and the two first pole lines are each a first pole first line and a first pole second line, The first drive assembly is connected to the second end of the first pole line and the second end of the second pole line, respectively, and the second drive assembly is connected to the second end of the first pole line and the second end of the second pole line, respectively. A charge / discharge circuit in which one end of the sixth switch is connected to the first drive assembly and the other end of the sixth switch is connected to the second drive assembly.

12. The charge / discharge circuit according to claim 11, wherein one end of the sixth switch is connected to the neutral point of the motor in the first drive assembly, and the other end of the sixth switch is connected to the neutral point of the motor in the second drive assembly.

13. The battery main control box further includes a first connector and a second connector, the first pole first line being connected to the first connector and the second connector, respectively, the first connector being for connection to the first pole of the first battery and the second connector being for connection to the first electrical load; the battery main control box further includes a third connector and a fourth connector, the first pole second line being connected to the third connector and the fourth connector, respectively, the third connector being for connection to the first pole of the second battery and the fourth connector being for connection to the second electrical load; the battery main control box further includes a fifth connector and a sixth connector, the second pole line being connected to the fifth connector and the sixth connector, respectively, the fifth connector being for connection to the second pole of the first battery and the second pole of the second battery and the sixth connector being for connection to the first electrical load and the second electrical load; the first drive assembly being connected to the second connector and the sixth connector, respectively, and the second drive assembly being connected to the fourth connector and the sixth connector, respectively, the charge-discharge circuit according to claim 11.

14. A first neutral wire terminal is provided at the neutral point of the motor in the first drive assembly, and a second neutral wire terminal is provided at the neutral point of the motor in the second drive assembly. The charge / discharge circuit according to claim 11, wherein one end of the sixth switch is connected to the first neutral wire terminal via a high-voltage wire harness, and the other end of the sixth switch is connected to the second neutral wire terminal via a high-voltage wire harness.

15. It further includes an energy storage element, The charge / discharge circuit according to claim 11, wherein the energy storage element is connected to a line between the neutral point of the motor in the first drive assembly and the neutral point of the motor in the second drive assembly and is connected in series with the sixth switch.

16. The energy storage element includes at least one inductor. The charge / discharge circuit according to claim 15, wherein the at least one inductor and the sixth switch are connected in series to a line between the neutral point of the motor in the first drive assembly and the neutral point of the motor in the second drive assembly.

17. The control device and the charge / discharge circuit described in claim 11 are included, The control device is communicated to a switch element in the charge / discharge circuit, and the switch element includes at least the first switch and the sixth switch, in an electrical device.

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