Electric energy power system and electric automobile

Abstract

An electric energy power system is connected with a first load (M1) and a second load (M2) and comprises a first power source (B1), a first power switch (KB1), a second power source (B2) and a second power switch (KB2). The positive electrode of the first power supply (B1) and the positive electrode of the second power supply (B2) are jointly connected to a first node (X1), and the first end of the first load (M1) and the first end of the second load (M2) are jointly connected to a second node (X2); the first node (X1) is connected with the second node (X2); the negative electrode of the first power supply (B1) is connected with the first end of the first battery switch (KB1), and the negative electrode of the second power supply (B2) is connected with the first end of the second battery switch (KB2); the second end of the first battery switch (KB1), the second end of the first load (M1), the second end of the second load (M2) and the second end of the second battery switch (KB2) are jointly connected to the power ground. According to the electric energy power system, front drive, rear drive, four-wheel drive and multiple working modes can be achieved only through the two switches, the control strategy is simple, the cost is low, and the reliability of the electric energy power system is improved. The invention further provides an automobile with the electric energy power system.

Description

Electric power systems and electric vehicles Technical Field

[0001] The present application belongs to the field of electronic circuit technology, and in particular relates to an electric power system and an electric vehicle. Background Art

[0002] With global warming, achieving carbon peak and carbon neutrality has become a global trend. Achieving carbon peak and carbon neutrality is a complex and specific undertaking encompassing numerous areas, including energy, economy, climate, and the environment. Against this backdrop, electric vehicles (EVs), primarily powered by batteries, have emerged and are increasing in number in recent years. EVs emit less carbon than traditional internal combustion engine vehicles, with pure EVs even producing zero emissions. Their high energy conversion efficiency has led to their recognition as a promising alternative to internal combustion engines. As a core component in EVs, the electric powertrain has garnered widespread attention.

[0003] The relevant electric power system is shown in Figure 1. It uses a large number of switches and does not involve redundancy of the load circuit, resulting in a complex control strategy, high cost and failure to meet the vehicle's four-wheel drive requirements.

[0004] Therefore, the related electric power system cannot meet the four-wheel drive requirements and has the defect of complex control strategy.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides an electric power system and an electric vehicle, aiming to solve the problem that the related electric power system cannot meet the four-wheel drive requirements and the control strategy is complex.

[0007] In a first aspect, the present application provides an electric power system, connected to a first load and a second load, comprising a first power source, a first battery switch, a second power source, and a second battery switch;

[0008] The positive electrode of the first power supply and the positive electrode of the second power supply are connected to a first node, the first end of the first load and the first end of the second load are connected to a second node; the first node is connected to the second node;

[0009] The negative electrode of the first power supply is connected to the first end of the first battery switch, and the negative electrode of the second power supply is connected to the first end of the second battery switch;

[0010] The second end of the first battery switch, the second end of the first load, the second end of the second load and the second end of the second battery switch are commonly connected to a power ground.

[0011] In the technical solution of the embodiment of the present application, since a power supply and a battery switch are connected in series to form a power supply module, the two power supply modules are connected in parallel between the first node and the power supply ground, and at the same time, the two loads are also connected in parallel between the second node and the power supply ground, and the first node and the second node are connected. For example, when applied to an electric vehicle, the power supply is a battery pack and the load is a drive motor. The front-wheel drive, rear-wheel drive and four-wheel drive functions can be achieved by setting only two switches. The control strategy is simple and the cost is low. When any power supply fails, the driving function of the circuit where the other power supplies are located is not affected, thereby improving the reliability of the electric power system.

[0012] The embodiment of the present application further provides a drive control method for the above-mentioned electric power system, including:

[0013] According to the driving instruction, the electric power system is controlled to operate in a corresponding operating mode, wherein the operating mode includes:

[0014] First operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be opened, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be disconnected from the second node and the power ground so that the second load stops operating;

[0015] Second operating mode: Control the first battery switch to be disconnected, control the second battery switch to be closed, control the first load to be connected between the second node and the power ground so that the first load operates, and control the second load to stop being connected between the second node and the power ground so that the second load stops operating;

[0016] A third operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be opened, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating;

[0017] Fourth operating mode: controlling the first battery switch to be disconnected, controlling the second battery switch to be closed, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating;

[0018] Fifth operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to stop being connected between the second node and the power ground so that the second load stops operating;

[0019] Sixth operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating;

[0020] Seventh operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be open, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates;

[0021] Eighth operating mode: controlling the first battery switch to be disconnected, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates;

[0022] Ninth working mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates.

[0023] By adopting this solution, since the first and second power supplies are connected in parallel, switching between the three modes does not cause changes in the circuit voltage, so the load can continue to operate normally. In this architecture, both the power supply and the electric drive system are redundant, greatly improving the safety of the electric power system. For example, when applied to electric vehicles, it supports the functional safety requirements of Level 4 / Level 5 for electric power systems.

[0024] In some embodiments, further comprising:

[0025] In the first working mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the first load maintains operation;

[0026] In the second working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the first load maintains operation;

[0027] In the third working mode, when a failure of the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the second load maintains operation;

[0028] In the fourth working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the second load maintains operation;

[0029] In the fifth working mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the first load maintains operation;

[0030] In the fifth working mode, when a fault is detected in the second power supply, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the first load maintains operation;

[0031] In the sixth operating mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the second load maintains operation;

[0032] In the sixth working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the second load maintains operation;

[0033] In the seventh working mode, when a fault of the first power source is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the first load and the second load maintain operation simultaneously;

[0034] In the eighth working mode, when a fault of the second power source is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the first load and the second load maintain operation simultaneously;

[0035] In the ninth operating mode, when a fault in the first power source is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the first load and the second load maintain operation simultaneously;

[0036] In the ninth operating mode, when a fault in the second power source is detected, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the first load and the second load maintain operation simultaneously.

[0037] By adopting the above solution, when the first power supply fails, the power supply can be switched to the second power supply, and when the second power supply fails, the power supply can be switched to the first power supply, thereby achieving redundant backup of the power supply.

[0038] In some embodiments, further comprising:

[0039] In the first operating mode, the fifth operating mode, the sixth operating mode, the seventh operating mode, the eighth operating mode, and the ninth operating mode, when a fault is detected in the first load, the first load is controlled to stop being connected between the second node and the power ground, so that the first load stops operating, and the second load is controlled or maintained to be connected between the second node and the power ground, so that the second load operates or maintains operating;

[0040] In the second operating mode, the third operating mode, the fourth operating mode, the seventh operating mode, the eighth operating mode and the ninth operating mode, when a fault is detected in the second load, the first load is controlled or maintained to be connected between the second node and the power ground so that the first load works or maintains working, and the second load is controlled to stop being connected between the second node and the power ground so that the second load stops working.

[0041] Applied to electric vehicles, by adopting the above solution, when the front-wheel drive function fails, it switches to the rear-wheel drive function; when the rear-wheel drive function fails, it switches to the front-wheel drive function; or when the four-wheel drive function fails, it switches to the front-wheel drive function or the rear-wheel drive function; thus, the switching of the drive functions is realized.

[0042] In some embodiments, the electric power system further comprises:

[0043] The pre-charging circuit is connected between the first node and the second node and is configured to first limit and transfer the first battery current output by the first power supply and then transfer the first battery current, or first limit and transfer the second battery current output by the second power supply and then transfer the second battery current, or limit and transfer a combined current and then transfer the combined current; wherein the combined current includes the first battery current output by the first power supply and the second battery current output by the second power supply.

[0044] By adopting the above solution, the battery current is limited and then transferred, thereby improving the reliability and safety of the electric power system.

[0045] In some embodiments, the pre-charging circuit includes a first switch, a second switch, and a current limiting resistor;

[0046] The first end of the first switch and the first end of the second switch serve together as the battery current input end of the pre-charging circuit, the second end of the second switch is connected to the first end of the current limiting resistor, and the second end of the current limiting resistor and the second end of the first switch serve together as the battery current output end of the pre-charging circuit.

[0047] By adopting the above solution, the structure of the pre-charging circuit is simple and the cost is low.

[0048] In some embodiments, it further includes an AC charging circuit, a DC charging interface, and a charging switch;

[0049] The first end of the DC charging interface and the first end of the AC charging circuit are connected to the second node, and the second end of the DC charging interface is connected to the first end of the charging switch;

[0050] The second end of the AC charging circuit and the second end of the charging switch are commonly connected to a power ground;

[0051] The AC charging circuit is configured to convert the input AC power into a first DC power to charge the first power source and / or the second power source;

[0052] The DC charging interface is configured to receive a second DC power and transfer the second DC power to charge the first power source and / or the second power source.

[0053] By adopting the above solution, an AC charging circuit and a DC charging interface are provided, which enables AC charging and DC charging of the power supply, enriching the functions of the product.

[0054] In some embodiments, the further comprising: a third power supply to an nth power supply, a third load to an mth load, and a third battery switch to an nth battery switch;

[0055] The positive electrode of the third power source and the positive electrode of the nth power source are connected to the first node, the negative electrode of the i-th power source is connected to the first end of the i-th battery switch, and the first end of the third load M3 and the first end of the m-th load are connected to the second node.

[0056] The second end of the third load to the second end of the mth load, and the second end of the third battery switch to the second end of the nth battery switch are commonly connected to a power ground;

[0057] Wherein, i is an integer greater than or equal to 3 and less than or equal to n; n and m are both integers greater than 2.

[0058] By connecting n power supplies and their corresponding n battery switches in parallel between a first node and a power ground, and connecting m loads in parallel between a second node and a power ground, and connecting the first node and the second node, any number of power supplies and any number of loads can be connected to the loop, thereby improving the flexibility of the electric power system application.

[0059] In some embodiments, further comprising a first current limiting circuit and a second current limiting circuit;

[0060] The first current limiting circuit is connected between the first node and the positive electrode of the first power supply, and the second current limiting circuit is connected between the first node and the positive electrode of the second power supply;

[0061] The first current limiting circuit is configured to limit the first battery current output by the first power supply;

[0062] The second current limiting circuit is configured to limit the second battery current output by the second power supply.

[0063] By providing the first current limiting circuit and the second current limiting circuit, discharge overcurrent of the first power supply and the second power supply is prevented, thereby improving the reliability and safety of the electric power system.

[0064] In some embodiments, further comprising a first collision switch circuit and a second collision switch circuit;

[0065] The first collision switch circuit is connected between the negative electrode of the first power supply and the power ground, and the second collision switch circuit is connected between the negative electrode of the second power supply and the power ground;

[0066] The first collision switch circuit is configured to disconnect the first power source from the power ground when a collision occurs in the electric power system;

[0067] The second collision switch circuit is configured to disconnect the second power source from the power ground when a collision occurs in the electric power system.

[0068] The collision switch circuit reacts faster than the current limiting circuit. When an accident is detected, the battery power is disconnected immediately, further improving the safety factor of the entire vehicle.

[0069] In some embodiments, the first load M1 includes a first load switch and a first motor, and the second load includes a second load switch and a second motor;

[0070] The first end of the first motor serves as the first end of the first load, the second end of the first motor is connected to the first end of the first load switch, and the second end of the first load switch serves as the second end of the first load;

[0071] The first end of the second motor serves as the first end of the second load, the second end of the second motor is connected to the first end of the second load switch, and the second end of the second load switch serves as the second end of the second load.

[0072] Through the above load structure, the load switch is connected in series between the motor and the power ground, thereby improving the convenience and reliability of control.

[0073] In a second aspect, an embodiment of the present invention further provides an electric vehicle, which includes the above-mentioned electric power system.

[0074] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0076] FIG1 is a schematic structural diagram of a related electric power system;

[0077] FIG2 is another structural schematic diagram of a related electric power system;

[0078] FIG3 is a schematic structural diagram of an electric power system provided in one embodiment of the present application;

[0079] FIG4 is another structural diagram of an electric power system provided in one embodiment of the present application;

[0080] FIG5 is a partial exemplary circuit diagram of an electric power system provided in one embodiment of the present application;

[0081] FIG6 is another structural diagram of an electric power system provided in one embodiment of the present application;

[0082] FIG7 is another structural diagram of an electric power system provided in one embodiment of the present application;

[0083] FIG8 is another structural diagram of an electric power system provided in one embodiment of the present application;

[0084] FIG9 is another structural diagram of an electric power system provided in one embodiment of the present application;

[0085] FIG10 is another schematic structural diagram of an electric power system provided in one embodiment of the present application;

[0086] FIG11 is another schematic structural diagram of an electric power system provided in one embodiment of the present application;

[0087] FIG12 is another partial exemplary circuit diagram of an electric power system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0088] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0096] Currently, market developments indicate that power systems are becoming increasingly widespread. They are used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power system applications continue to expand, market demand is also growing.

[0097] With the widespread adoption of power systems in electric vehicles, the associated electric power systems lack load circuit redundancy and are unable to meet the vehicle's four-wheel drive requirements. In recent years, electric power systems comprising multiple motor systems have emerged, as shown in FIG2 . These systems specifically include: multiple motor systems 7, each connected via a clutch 8; multiple battery packs or batteries 1, each electrically connected to each of the multiple motor systems 7 via a switch device 10 for supplying or receiving power from the motor system 7; a battery status detection device 9 electrically connected to each of the multiple battery packs or batteries 1 for detecting the status of each battery pack or battery 1; and a controller 2 electrically connected to the battery status detection device 9 and the switch device 10 for controlling the clutch 8 and the switch device 10 based on the power demand of the motor power system's load and the status of each battery pack or battery 1, to determine which motor system 7 is connected via the clutch 8 and which battery pack or battery 1 is electrically connected to the motor system 7. Because the switch device 10 includes a large number of switches, the control strategy is complex and costly.

[0098] In order to solve the problem of complex and high cost control strategy, the applicant has found that a power supply and a battery switch can be connected in series to form a power module in the design, and the two power modules can be connected in parallel between the first node and the power ground. At the same time, the two loads are also connected in parallel between the second node and the power ground, and the first node and the second node are connected, thereby reducing the number of switches, simplifying the control strategy and reducing costs.

[0099] The electric power system disclosed in the embodiments of the present application can be used in an electric device that uses the electric power system as a drive device. The electric device can be, but is not limited to, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0100] For the convenience of description, the following embodiments are described by taking an electric vehicle as an example of an electric device in one embodiment of the present application.

[0101] Electric vehicles are equipped with a power supply, which can be located at the bottom, front, or rear of the vehicle. This power supply is used to power the vehicle. Electric vehicles also include a controller and a motor. The controller controls the power supply to power the motor, for example, to meet the vehicle's starting and driving needs.

[0102] In some embodiments of the present application, the power supply can serve as a driving power source for the electric vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the electric vehicle.

[0103] According to some embodiments of the present application, referring to FIG3 , FIG3 shows a schematic structural diagram of an electric power system provided by an embodiment of the present application. For ease of illustration, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0104] The electric power system is connected to a first load M1 and a second load M2, and includes a first power source B1, a first battery switch KB1, a second power source B2, and a second battery switch KB2.

[0105] The positive electrode of the first power supply B1 and the positive electrode of the second power supply B2 are connected to a first node X1, and the first end of the first load M1 and the first end of the second load M1 are connected to a second node X2. The first node X1 is connected to the second node X2. The negative electrode of the first power supply B1 is connected to the first end of the first battery switch KB1, and the negative electrode of the second power supply B2 is connected to the first end of the second battery switch KB2. The second end of the first battery switch KB1, the second end of the first load M1, the second end of the second load M2, and the second end of the second battery switch KB2 are connected to the power ground.

[0106] It is understood that both the first power source B1 and the second power source B2 can be battery packs. The battery pack provides energy for the load and contains battery cells and components such as copper busbars or wiring harnesses for high-voltage connections. Optionally, the battery pack does not contain high-voltage relays. Depending on the vehicle's requirements, the load can be designed as an electric drive system or a high-voltage load such as a compressor or electric heater.

[0107] The operating modes of the electric power system shown in Figure 3 are divided into nine operating modes, as follows:

[0108] In the first operating mode, the first battery switch KB1 is closed, the second battery switch KB2 is opened, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0109] In the second working mode, the first battery switch KB1 is disconnected, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0110] In the third operating mode, the first battery switch KB1 is closed, the second battery switch KB2 is opened, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 is stopping working.

[0111] In the fourth operating mode, the first battery switch KB1 is disconnected, the second battery switch KB2 is closed, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 stops working.

[0112] In the fifth working mode, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0113] In the sixth working mode, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 stops working.

[0114] In the seventh working mode, the first battery switch KB1 is closed, the second battery switch KB2 is opened, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0115] In the eighth working mode, the first battery switch KB1 is disconnected, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0116] In the ninth working mode, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0117] When the electric power system shown in Figure 3 fails, the working principle is as follows:

[0118] In the first working mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch KB2 is closed. At this time, the first load M1 keeps working and the second load M2 stops working, that is, switching to the second working mode.

[0119] In the second working mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 is closed. At this time, the first load M1 keeps working and the second load M2 stops working, that is, the system switches to the first working mode.

[0120] In the third operating mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch KB2 is closed. At this time, the first load M1 stops working and the second load M2 keeps working, that is, switching to the fourth operating mode.

[0121] In the fourth operating mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 is closed. At this time, the first load M1 stops working and the second load M2 keeps working, that is, switching to the third operating mode.

[0122] In the fifth operating mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch KB2 remains closed. At this time, the first load M1 continues to work and the second load M2 stops working, that is, switching to the second operating mode.

[0123] In the fifth operating mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 remains closed. At this time, the first load M1 continues to operate and the second load M2 stops operating, that is, switching to the first operating mode.

[0124] In the sixth operating mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch KB2 remains closed. At this time, the first load M1 stops working and the second load M2 continues working, that is, switching to the fourth operating mode.

[0125] In the sixth operating mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 remains closed. At this time, the first load M1 stops working and the second load M2 continues working, that is, switching to the third operating mode.

[0126] In the seventh operating mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch LB2 is closed. At this time, the first load M1 and the second load M2 maintain operation at the same time, that is, the system switches to the eighth operating mode.

[0127] In the eighth operating mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 is closed. At this time, the first load M1 and the second load M2 maintain operation at the same time, that is, the system switches to the seventh operating mode.

[0128] In the ninth working mode, when the first power source B1 fails, the first battery switch KB1 is disconnected and the second battery switch KB2 remains closed. At this time, the first load M1 and the second load M2 continue to work, ie, the system switches to the eighth working mode.

[0129] In the ninth operating mode, when the second power source B2 fails, the second battery switch KB2 is disconnected and the first battery switch KB1 remains closed. At this time, the first load M1 and the second load M2 continue to operate, that is, the system switches to the seventh operating mode.

[0130] In the first, fifth, sixth, seventh, eighth, and ninth operating modes, when a fault occurs in the first load, the first load M1 stops being connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 stops working, and the second load M2 works or maintains working.

[0131] In the second working mode, the third working mode, the fourth working mode, the seventh working mode, the eighth working mode and the ninth working mode, when the first load fails, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 works or maintains working, and the second load M2 stops working.

[0132] Since a power supply and a battery switch are connected in series to form a power module, the two power modules are connected in parallel between the first node and the power ground, and at the same time, the two loads are also connected in parallel between the second node and the power ground, and the first node and the second node are connected, when applied to an electric vehicle, the front-wheel drive, rear-wheel drive and four-wheel drive functions can be achieved by setting only two switches. The control strategy is simple and the cost is low. Moreover, when any power supply fails, the driving function of the circuit where the other power supplies are located is not affected, thereby improving the reliability of the electric power system.

[0133] According to some embodiments of the present application, optionally, please continue to refer to FIG4 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0134] In addition to all the components and assemblies of the electric power system shown in FIG3 , the electric power system further includes a pre-charging circuit 11 .

[0135] The pre-charge circuit 11 is connected between a first node X1 and a second node X2 and is configured to first limit and transfer a first battery current output by the first power source B1 and then transfer the first battery current; or to first limit and transfer a second battery current output by the second power source B2 and then transfer the second battery current; or to limit and transfer a combined current and then transfer the combined current; wherein the combined current includes the first battery current output by the first power source B1 and the second battery current output by the second power source B2.

[0136] The operating modes of the electric power system shown in Figure 4 are divided into nine operating modes, as follows:

[0137] In the tenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is disconnected, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0138] In the eleventh working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is turned off, the second battery switch KB2 is turned on, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0139] In the twelfth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is disconnected, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 stops working.

[0140] In the thirteenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is turned off, the second battery switch KB2 is turned on, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 stops working.

[0141] In the fourteenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 stops being connected between the second node X1 and the power ground. At this time, the first load M1 is working and the second load M2 is stopping working.

[0142] In the fifteenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the second load M2 is connected between the second node X1 and the power ground, and the first load M1 stops being connected between the second node X1 and the power ground. At this time, the second load M2 is working and the first load M1 stops working.

[0143] In the sixteenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is disconnected, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0144] In the seventeenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is turned off, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0145] In the eighteenth working mode, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, the second battery switch KB2 is closed, the first load M1 is connected between the second node X1 and the power ground, and the second load M2 is connected between the second node X1 and the power ground. At this time, the first load M1 and the second load M2 work simultaneously.

[0146] When the power supply is discharged, there will be a large current. By setting the pre-charging circuit 11, the large current at the moment of discharge can be prevented, thereby protecting the load.

[0147] According to some embodiments of the present application, optionally, please continue to refer to FIG. 5 , the first pre-charging circuit 11 includes a first switch K1 , a second switch K2 , and a current-limiting resistor R.

[0148] The first end of the first switch K1 and the first end of the second switch K2 serve together as the battery current input end of the pre-charging circuit 11. The second end of the second switch K2 is connected to the first end of the current limiting resistor R. The second end of the current limiting resistor R and the second end of the first switch K1 serve together as the battery current output end of the pre-charging circuit 11.

[0149] The pre-charging circuit 11 is turned on specifically as follows: after the second switch K2 is closed for a preset time, the first switch K1 is closed and the second switch K2 is opened. When the second switch K2 is closed, the first battery current output by the first power source B1 is limited and diverted, or the first battery current output by the second power source B2 is limited and diverted, or the combined current is limited and diverted. When the first switch K1 is closed and the second switch K2 is opened, the first battery current, the second battery current, or the combined current is diverted.

[0150] The pre-charging circuit 11 has a simple structure and low cost.

[0151] According to some embodiments of the present application, optionally, both the first switch K1 and the second switch K2 include relays, and the current-limiting resistor R includes a thermistor.

[0152] The thermistor may be a positive temperature coefficient thermistor. The relay may be an electromagnetic relay, an induction relay, an electric relay, an electronic relay, etc., which are not limited here.

[0153] At the moment of power-on, lightning strike, or static electricity, the thermistor will generate a very large surge current. The current flowing through it will suddenly exceed its rated current. The thermistor heats up and its resistance value instantly presents high impedance, which inhibits the current from flowing to the subsequent circuit and plays a current limiting role. After the current returns to normal, the impedance decreases and the thermistor returns to a low impedance state.

[0154] Thermistor is used to prevent inrush current at startup.

[0155] According to some embodiments of the present application, optionally, please continue to refer to FIG6 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0156] In addition to all the components and assemblies of the electric power system shown in FIG4 , the electric power system further includes an AC charging circuit 13 , a DC charging interface 12 and a charging switch KC.

[0157] A first end of the DC charging interface 12 and a first end of the AC charging circuit 13 are commonly connected to a second node X2, and a second end of the DC charging interface 12 is connected to a first end of the charging switch KC. A second end of the AC charging circuit 13 and a second end of the charging switch KC are commonly connected to a power ground. The AC charging circuit 13 is configured to convert the incoming AC power into a first DC power to charge the first power supply B1 and / or the second power supply B2. The DC charging interface 12 is configured to receive a second DC power and convert the second DC power to charge the first power supply B1 and / or the second power supply B2.

[0158] The AC charging circuit 13 may be a switching power supply, and the DC charging interface 12 may be a connector.

[0159] The DC charging mode of the electric power system shown in FIG6 is divided into three DC charging modes, as follows:

[0160] In the first DC charging mode, the pre-charging circuit 11 is turned on, the charging switch KC and the first battery switch KB1 are closed, and the second battery switch KB2 is turned off. In this case, the first power supply B1 is charged, and the second power supply B2 is stopped. In the second DC charging mode, the pre-charging circuit 11 is turned on, the charging switch KC and the second battery switch KB2 are closed, and the first battery switch KB1 is turned off. In this case, the second power supply B2 is charged, and the first power supply B1 is stopped. In the third DC charging mode, the charging switch KC, the first battery switch KB1, and the second battery switch KB2 are closed, and the pre-charging circuit 11 is turned on. In this case, the first power supply B1 and the second power supply B2 are charged simultaneously.

[0161] The DC charging mode of the electric power system shown in Figure 6 is divided into three AC charging modes, as follows:

[0162] In the first AC charging mode, the AC charging circuit 13 is connected to AC power, the pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, and the second battery switch KB2 and the charging switch KC are disconnected. At this time, the first power source B1 is charged and the second power source B2 is stopped from being charged.

[0163] In the second AC charging mode, the AC charging circuit 13 is connected to AC power, the pre-charging circuit 11 is turned on, the second battery switch KB2 is closed, and the first battery switch KB1 and the charging switch KC are disconnected. At this time, the second power source B2 is charged and the charging of the first power source B1 is stopped.

[0164] In the third AC charging mode, the AC charging circuit 13 is connected to AC power, the pre-charging circuit 11 is turned on, the second battery switch KB2, the first battery switch KB1 and the charging switch KC are closed, and the second power source B2 and the first power source B1 are charged simultaneously.

[0165] By providing the AC charging circuit 13 and the DC charging interface 12, AC charging and DC charging of the power supply are realized, enriching the functions of the product.

[0166] According to some embodiments of the present application, optionally, the first battery switch KB1 and the second battery switch KB2 include relays.

[0167] The relay may be an electromagnetic relay, an inductive relay, an electric relay, an electronic relay, etc., which is not limited here.

[0168] The battery switch is realized by relay, which is simple and reliable.

[0169] According to some embodiments of the present application, optionally, please continue to refer to FIG7 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0170] In addition to all the components and assemblies of the electric power system shown in FIG3 , the electric power system further includes third power sources B3 to nth power sources Bn, third loads M3 to mth loads Mm, and third battery switches KB3 to nth battery switches KBn.

[0171] The positive electrode of the third power supply B3 and the positive electrode of the nth power supply Bn are commonly connected to a first node, the negative electrode of the i-th power supply Bi is connected to the first end of the i-th battery switch KBi, the first end of the third load M3 and the first end of the m-th load Mm are commonly connected to a second node; the second end of the third load M3 and the second end of the m-th load Mm, and the second end of the third battery switch KB3 and the second end of the n-th battery switch KBn are commonly connected to a power ground; wherein i is an integer greater than or equal to 3 and less than or equal to n; and n and m are both integers greater than 2.

[0172] The loads can be of the same or different types. When the loads are the same, they can be redundant. When the loads have different functions, power can be supplied to multiple loads depending on the type of load connected. The number of connected loads can be increased or decreased based on actual needs, and they can be connected to the power system in parallel.

[0173] In a specific implementation, any positive integer number of battery switches KBi from the third battery switch KB3 to the nth battery switch KBn can be closed, and any positive integer number of loads Mi from the third load M3 to the mth load Mm can be connected between the second node X1 and the power ground. At this time, the loads connected between the second node X1 and the power ground work, and the other loads stop working.

[0174] When one or more power sources Bi among any positive integer number of power sources Bi corresponding to any positive integer number of battery switches KBi fail, the one or more battery switches KBi corresponding to the one or more power sources Bi are disconnected to stop discharging the one or more failed power sources Bi. Simultaneously, the one or more battery switches KBi that were originally disconnected can be closed to enable the one or more power sources Bi newly connected to the discharge circuit to discharge.

[0175] When one or more loads Mi among any positive integer number of loads Mi fail, the failed load or loads Mi are no longer connected between the second node X1 and the power ground, causing the failed load or loads Mi to cease operation. Simultaneously, the previously disconnected load or loads Mi can be connected to enable the newly connected load or loads Mi between the second node X1 and the power ground to operate.

[0176] By expanding the number of power sources to n and the number of loads to m, and connecting the n power sources and their corresponding n battery switches in parallel between the first node and the power ground, and connecting the m loads in parallel between the second node and the power ground, and connecting the first node and the second node, any number of power sources and any number of loads can be connected to the loop, thereby improving the flexibility of the application of the electric power system.

[0177] According to some embodiments of the present application, optionally, please continue to refer to FIG8 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0178] In addition to all the components and assemblies of the electric power system shown in FIG3 , the electric power system further includes a first current limiting circuit 141 and a second current limiting circuit 142 .

[0179] The first current limiting circuit 141 is connected between the first node X1 and the positive electrode of the first power supply B1 , and the second current limiting circuit 142 is connected between the first node X1 and the positive electrode of the second power supply B2 .

[0180] The first current limiting circuit 141 is configured to limit the first battery current output by the first power source B1 .

[0181] The second current limiting circuit 142 is configured to limit the second battery current output by the second power source B2 .

[0182] In a specific implementation, the first current limiting circuit 141 includes a first thermal fuse F1 , and the second current limiting circuit 142 includes a first thermal fuse F2 .

[0183] When the current of the discharge branch of the first power supply B1 is greater than a preset value, the first current limiting circuit 141 is disconnected; when the current of the discharge branch of the second power supply B2 is greater than a preset value, the second current limiting circuit 142 is disconnected.

[0184] By providing the first current limiting circuit 141 and the second current limiting circuit 142 , the first power source B1 and the second power source B2 are prevented from over-discharging, thereby improving the reliability and safety of the electric power system.

[0185] According to some embodiments of the present application, optionally, please continue to refer to FIG9 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0186] In addition to all the components and assemblies of the electric power system shown in FIG. 7 , the electric power system further includes a first thermal fuse F1 to an nth thermal fuse Fn.

[0187] The j-th thermal fuse Fj is connected between the first node X1 and the positive electrode of the j-th power source Bj, where j is a positive integer less than or equal to n.

[0188] When the current of the discharge branch of the jth power supply Bj is greater than a preset value, the jth thermal fuse Fj is disconnected.

[0189] By providing the first to nth thermal fuses F1 to Fn, discharge and overcurrent of the first to nth power supplies B1 to Bn are prevented, thereby improving the reliability and safety of the electric power system.

[0190] According to some embodiments of the present application, optionally, please continue to refer to FIG10 , which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0191] In addition to all the components and assemblies of the electric power system shown in FIG. 3 , the electric power system further includes a first collision switch circuit 151 and a second collision switch circuit 152 .

[0192] The first collision switch circuit 151 is connected between the negative electrode of the first power supply B1 and the power ground, and the second collision switch circuit 152 is connected between the negative electrode of the second power supply B2 and the power ground.

[0193] The first collision switch circuit 151 is configured to disconnect the first power source B1 from the power ground when a collision occurs in the electric power system;

[0194] The second collision switch circuit 152 is configured to disconnect the second power source B2 from the power ground when a collision occurs in the electric power system.

[0195] In a specific implementation, the first collision switch circuit 151 includes a first explosive fuse Pyro1 , and the second collision switch circuit 152 includes a second explosive fuse Pyro2 .

[0196] Among them, the trigger signals of the first collision switch circuit 151 and the second collision switch circuit 152 are collision detection signals detected by the controller. When the vehicle (electric power system) collides, the collision detection signal detected by the controller triggers the collision switch circuit, so that the connecting wires in the explosive fuse in the collision switch circuit are blown open by gunpowder, thereby cutting off the power supply at the part closest to the power supply to avoid short circuit and fire.

[0197] According to some embodiments of the present application, optionally, please continue to refer to FIG11, which shows a schematic structural diagram of an electric power system provided by another embodiment of the present application. For ease of illustration, only the parts related to this embodiment are shown, which are detailed as follows:

[0198] In addition to all the components and assemblies of the electric power system shown in FIG7 , the electric power system further includes a first explosion fuse Pyro1 and an nth explosion fuse Pyron;

[0199] The kth exploding fuse Pyrok is connected between the negative electrode of the kth power supply Bk and the power ground.

[0200] Among them, the trigger signals of the first explosive fuse Pyro1 to the kth explosive fuse Pyrok are collision detection signals detected by the controller. When the vehicle collides, the collision detection signal detected by the controller triggers the explosive fuse, so that the connecting wires in the explosive fuse are blown open by gunpowder, thereby cutting off the power supply at the part closest to the power supply, avoiding short circuit and fire.

[0201] The explosive fuse reacts faster than a thermal fuse, immediately disconnecting the battery when an incident is detected. Even if a short circuit occurs or the protection circuit fails, it will not cause a fire or damage electrical components, further improving the safety factor of the entire vehicle.

[0202] According to some embodiments of the present application, optionally, please continue to refer to FIG. 12 , the first load M1 includes a first load switch KL1 and a first motor Motor1 , and the second load M2 includes a second load switch KL2 and a second motor Motor2 .

[0203] The first end of the first motor Motor1 serves as the first end of the first load M1, the second end of the first motor Motor1 is connected to the first end of the first load switch KL1, and the second end of the first load switch KL1 serves as the second end of the first load M1; the first end of the second motor Motor2 serves as the first end of the second load M2, the second end of the second motor Motor2 is connected to the first end of the second load switch KL2, and the second end of the second load switch KL2 serves as the second end of the second load M2.

[0204] In a specific implementation, the first load M1 is connected between the second node X1 and the power ground by closing the first load switch KL1 so that the first motor Motor1 is connected between the second node X1 and the power ground; the first load M1 stops being connected between the second node X1 and the power ground by disconnecting the first load switch KL1 so that the first motor Motor1 stops being connected between the second node X1 and the power ground; the second load M2 is connected between the second node X1 and the power ground by closing the second load switch KL2 so that the second motor Motor2 is connected between the second node X1 and the power ground; the second load M2 stops being connected between the second node X1 and the power ground by disconnecting the second load switch KL2 so that the second motor Motor2 stops being connected between the second node X1 and the power ground.

[0205] It should be noted that the first load switch KL1 and the second load switch KL2 may be relays.

[0206] Through the above load structure, the load switch is connected in series between the motor and the power ground, thereby improving the convenience and reliability of control.

[0207] According to some embodiments of the present application, the present application also provides an electric vehicle, comprising an electric power system according to any of the above solutions.

[0208] It should be noted that the electric vehicle may also include a battery management system and a controller; wherein the battery management system is used to intelligently manage and maintain each power supply, prevent the power supply from overcharging and over-discharging, extend the service life of the power supply, and monitor the status of the power supply; the controller is used to provide control signals to control the on and off of each switch and the on and off of each pre-charging circuit 11.

[0209] Since the electric vehicle includes an electric power system of any of the above schemes, it can realize front-wheel drive, rear-wheel drive and four-wheel drive functions, with a simple control strategy and low cost; and when any power supply fails, it will not affect the driving function of the circuit where the other power supplies are located, thereby improving the reliability of the electric vehicle.

[0210] According to some embodiments of the present application, a drive control method based on the electric power system shown in Figure 3 is also provided. The above-mentioned drive control method includes controlling the electric power system to operate in a corresponding working mode according to a drive instruction, wherein the working mode includes the first working mode to the ninth working mode.

[0211] First operating mode: Control the first battery switch KB1 to be closed, control the second battery switch KB2 to be disconnected, control the first load M1 to be connected between the second node X1 and the power ground, so that the first load M1 operates, and control the second load M2 to stop being connected between the second node X1 and the power ground, so that the second load M2 stops operating.

[0212] Second operating mode: Control the first battery switch KB1 to be disconnected, control the second battery switch KB2 to be closed, control the first load M1 to be connected between the second node X1 and the power ground, so that the first load M1 operates, and control the second load M2 to stop being connected between the second node X1 and the power ground, so that the second load M2 stops operating.

[0213] Third operating mode: Control the first battery switch KB1 to be closed, control the second battery switch KB2 to be disconnected, control the second load M2 to be connected between the second node X1 and the power ground, so that the second load M2 operates, and control the first load M1 to stop being connected between the second node X1 and the power ground, so that the first load M1 stops operating.

[0214] Fourth operating mode: Control the first battery switch KB1 to be disconnected, control the second battery switch KB2 to be closed, and control the second load M2 to be connected between the second node X1 and the power ground so that the second load M2 operates, and control the first load M1 to stop being connected between the second node X1 and the power ground so that the first load M1 stops operating.

[0215] Fifth operating mode: Control the first battery switch KB1 to be closed, control the second battery switch KB2 to be closed, control the first load M1 to be connected between the second node X1 and the power ground, so that the first load M1 works, and control the second load M2 to stop being connected between the second node X1 and the power ground, so that the second load M2 stops working.

[0216] Sixth operating mode: Control the first battery switch KB1 to be closed, control the second battery switch KB2 to be closed, and control the second load M2 to be connected between the second node X1 and the power ground so that the second load M2 operates, and control the first load M1 to stop being connected between the second node X1 and the power ground so that the first load M1 stops operating.

[0217] Seventh working mode: the first battery switch KB1 is controlled to be closed, the second battery switch KB2 is controlled to be opened, the first load M1 is controlled to be connected between the second node X1 and the power ground, so that the first load M1 is in operation, and the second load M2 is controlled to be connected between the second node X1 and the power ground, so that the second load M2 is in operation.

[0218] Eighth operating mode: the first battery switch KB1 is controlled to be disconnected, the second battery switch KB2 is controlled to be closed, the first load M1 is controlled to be connected between the second node X1 and the power ground, so that the first load M1 is in operation, and the second load M2 is controlled to be connected between the second node X1 and the power ground, so that the second load M2 is in operation.

[0219] Ninth working mode: the first battery switch KB1 is controlled to be closed, the second battery switch KB2 is controlled to be closed, the first load M1 is controlled to be connected between the second node X1 and the power ground, so that the first load M1 is in operation, and the second load M2 is controlled to be connected between the second node X1 and the power ground, so that the second load M2 is in operation.

[0220] For example, when an electric vehicle is traveling on a road with fewer bends and slopes, the electric power system can be controlled to operate in the first operating mode, the second operating mode, or the fifth operating mode. At this time, only the first battery switch KB1 and / or the second battery switch KB2 are controlled to be closed, and the front-drive motor (first load M1) is connected to the circuit, while the rear-drive motor (second load M2) is disconnected from the circuit; the electric vehicle operates in the front-drive operating mode.

[0221] When the electric vehicle is traveling on a road with many bends and few slopes, the electric power system can be controlled to operate in the third operating mode, the third operating mode or the sixth operating mode, and only the first battery switch KB1 and / or the second battery switch KB2 are controlled to be closed, and the front drive motor (first load M1) is disconnected from the circuit, and the rear drive motor (second load M2) is connected to the circuit; the electric vehicle operates in the rear drive operating mode.

[0222] When the electric vehicle is traveling on a road with many bends and slopes, the electric power system can be controlled to operate in the seventh operating mode, the eighth operating mode, or the ninth operating mode, and only the first battery switch KB1 and / or the second battery switch KB2 are controlled to be closed, and the front drive motor (first load M1) is connected to the circuit, and the rear drive motor (second load M2) is connected to the circuit; that is, the electric vehicle operates in the four-wheel drive mode.

[0223] By connecting the first load M1, the front-wheel drive function can be achieved; by connecting the second load M2, the rear-wheel drive function can be achieved; by connecting the first load M1 and the second load M2 at the same time, the four-wheel drive function can be achieved, and the battery voltage is balanced when the first battery switch KB1 and / or the second battery switch KB2 are both closed; therefore, the control strategy is simple and the cost is low.

[0224] Because the first power supply B1 and the second power supply B2 are connected in parallel, switching between the nine modes does not cause changes in the circuit voltage, so the load can continue to operate normally. In this architecture, both the power supply and the electric drive system are redundant, greatly improving the safety of the electric power system and supporting the functional safety requirements of Level 4 / Level 5.

[0225] According to some embodiments of the present application, in a first operating mode, when a fault in the first power source B1 is detected, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is controlled to be closed so that the first load M1 maintains operation; in a second operating mode, when a fault in the second power source B2 is detected, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is controlled to be closed so that the first load M1 maintains operation;

[0226] In the third working mode, when a fault in the first power source B1 is detected, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is controlled to be closed so that the second load M2 maintains operation; in the fourth working mode, when a fault in the second power source B2 is detected, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is controlled to be closed so that the second load M2 maintains operation; in the fifth working mode, when a fault in the first power source B1 is detected, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is maintained closed so that the first load M1 maintains operation; in the fifth working mode, when a fault in the second power source B2 is detected, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is maintained closed so that the first load M1 maintains operation; in the sixth working mode, when a fault in the first power source B1 is detected, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is maintained closed so that the second load M2 maintains operation; 2, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is kept closed so that the second load M2 maintains operation; in the seventh operating mode, when a fault is detected in the first power source B1, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is controlled to be closed so that the first load M1 and the second load M2 maintain operation simultaneously; in the eighth operating mode, when a fault is detected in the second power source B2, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is controlled to be closed so that the first load M1 and the second load M2 maintain operation simultaneously; in the ninth operating mode, when a fault is detected in the first power source B1, the first battery switch KB1 is controlled to be disconnected and the second battery switch KB2 is kept closed so that the first load M1 and the second load M2 maintain operation simultaneously; in the ninth operating mode, when a fault is detected in the second power source B2, the second battery switch KB2 is controlled to be disconnected and the first battery switch KB1 is kept closed so that the first load M1 and the second load M2 maintain operation simultaneously.

[0227] It should be noted that when a fault is detected in the first power supply B1, such as undervoltage or overcurrent, the electric vehicle controls the first battery switch KB1 to be disconnected and controls or maintains the second battery switch KB2 to be closed, switching the working mode so that the second power supply B2 starts or maintains discharging.

[0228] When a fault is detected in the second power source B2, such as undervoltage or overcurrent, the electric vehicle controls the second battery switch KB2 to be disconnected and controls or maintains the first battery switch KB1 to be closed, switching the working mode so that the first power source B1 starts or maintains discharging.

[0229] Since the first power supply B1 and the second power supply B2 are connected in parallel, the high-voltage circuit voltage will not change when the power supply mode is switched, so the load end can still work normally.

[0230] Since the power supply can be switched between the first power supply B1 and the second power supply B2, the reliability and flexibility of the power supply of the electric power system are improved.

[0231] According to some embodiments of the present application, in the first working mode, the fifth working mode, the sixth working mode, the seventh working mode, the eighth working mode and the ninth working mode, when a fault is detected in the first load, the first load M1 is controlled to stop being connected between the second node X1 and the power ground, so that the first load M1 stops working, and the second load M2 is controlled or maintained to be connected between the second node X1 and the power ground, so that the second load M2 works or maintains working; in the second working mode, the third working mode, the fourth working mode, the seventh working mode, the eighth working mode and the ninth working mode, when a fault is detected in the second load M2, the first load M1 is controlled or maintained to be connected between the second node X1 and the power ground, so that the first load M1 works or maintains working, and the second load M2 is controlled to stop being connected between the second node X1 and the power ground, so that the second load M2 stops working.

[0232] The first load M1 and the second load M2 can be vehicle drive systems, connected in parallel in the architecture. Internal power devices can be activated to switch between three modes: the first load M1 connected alone, the second load M2 connected alone, and the first load M1 and the second load M2 connected simultaneously.

[0233] When a load fails, the load is controlled to stop being connected to the second node and the power ground. Specifically, when a load fails, such as a severe overcurrent or overtemperature, the digital circuit determines the fault level at this time and chooses to disconnect the load from the electric power system through the load's internal power semiconductor device, so that the load no longer participates in the charging and discharging of the electric power system.

[0234] For example, when the electric vehicle is operating in a front-wheel drive operating mode (such as the first operating mode), that is, the front-wheel drive motor (first load M1) is controlled to be connected between the second node X1 and the power ground to make the front-wheel drive motor work, and the rear-wheel drive motor (second load M2) is controlled to stop being connected between the second node X1 and the power ground to make the rear-wheel drive motor stop working, a fault in the front-wheel drive motor is detected, and the electric vehicle switches from the front-wheel drive operating mode to the rear-wheel drive operating mode (such as the third operating mode), that is, the rear-wheel drive motor (second load M2) is connected between the second node X1 and the power ground to make the rear-wheel drive motor (second load M2) work, and the front-wheel drive motor (first load M1) stops being connected between the second node X1 and the power ground to make the front-wheel drive motor (first load M1) stop working.

[0235] When the front drive function is used and the first load M1 fails (front drive function failure), the rear drive function replaces the front drive function by connecting the second load M1 and disconnecting the first load M1, thereby improving the reliability of the electric power system.

[0236] For example, when the electric vehicle is operating in a rear-wheel drive operating mode (such as the second operating mode), that is, the rear-wheel drive motor (second load M2) is controlled to be connected between the second node X1 and the power ground to make the rear-wheel drive motor (second load M2) work, and the front-wheel drive motor (first load M1) stops being connected between the second node X1 and the power ground to make the front-wheel drive motor (first load M1) stop working, and a fault in the rear-wheel drive motor is detected, the electric vehicle switches from the rear-wheel drive operating mode to the front-wheel drive operating mode (such as the first operating mode), that is, the front-wheel drive motor (first load M1) is controlled to be connected between the second node X1 and the power ground to make the front-wheel drive motor work, and the rear-wheel drive motor (second load M2) is controlled to stop being connected between the second node X1 and the power ground to make the rear-wheel drive motor stop working.

[0237] When the rear-wheel drive function is used and the second load M2 fails (rear-wheel drive function failure), the front-wheel drive function replaces the rear-wheel drive function by connecting the first load M1 and disconnecting the second load M2, thereby improving the reliability of the electric power system.

[0238] For example, when the electric vehicle is operating in a four-wheel drive operating mode (such as the ninth operating mode), the rear-wheel drive motor (second load M2) is controlled to be connected between the second node X1 and the power ground so that the rear-wheel drive motor (second load M2) can operate, and the front-wheel drive motor (first load M1) is controlled to be connected between the second node X1 and the power ground so that the front-wheel drive motor (first load M1) can operate. When a fault in the rear-wheel drive motor is detected, the electric vehicle switches from the four-wheel drive operating mode to the front-wheel drive operating mode (such as the fifth operating mode), that is, the rear-wheel drive motor (second load M2) is controlled to stop being connected between the second node X1 and the power ground so that the rear-wheel drive motor (second load M2) stops working, and the front-wheel drive motor (first load M1) is controlled to be connected between the second node X1 and the power ground so that the front-wheel drive motor (first load M1) can operate. By analogy, it can be concluded that the four-wheel drive operating mode is switched to the rear-wheel drive operating mode (such as the sixth operating mode).

[0239] The switching of other working modes can be deduced in the same way and will not be described here in detail.

[0240] When the four-wheel drive function is used and the first load M1 or the second load M2 fails (front-wheel drive function or rear-wheel drive function failure), the circuit corresponding to the fault is disconnected, and the front-wheel drive or rear-wheel drive replaces the four-wheel drive function; therefore, when any load fails, it does not affect the driving function of the circuit where the other loads are located, thereby improving the reliability of the electric power system.

[0241] The control signal for controlling the above switches can be provided by a digital circuit.

[0242] It's important to emphasize that throughout the entire process, fault diagnosis, fault handling, power supply mode switching, and load switching are all autonomously executed by digital circuits, requiring no user intervention. There's no high-voltage interruption or power loss during the entire process, ensuring the power system is safe and reliable.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An electric power system connected to a first load and a second load, characterized in that: comprising a first power supply, a first power switch, a second power supply and a second power switch; The positive electrode of the first power supply and the positive electrode of the second power supply are connected to a first node, the first end of the first load and the first end of the second load are connected to a second node; the first node is connected to the second node; The negative electrode of the first power supply is connected to the first end of the first battery switch, and the negative electrode of the second power supply is connected to the first end of the second battery switch; The second end of the first battery switch, the second end of the first load, the second end of the second load and the second end of the second battery switch are commonly connected to a power ground.

2. The electric power system according to claim 1, wherein: Also includes: The pre-charging circuit is connected between the first node and the second node and is configured to first limit and transfer a first battery current output by the first power supply and then transfer the first battery current, or to first limit and transfer a second battery current output by the second power supply and then transfer the second battery current, or to limit and transfer a combined current and then transfer the combined current; wherein the combined current includes the first battery current output by the first power supply and the second battery current output by the second power supply.

3. The electric power system according to claim 2, characterized in that: The pre-charging circuit includes a first switch, a second switch and a current limiting resistor; The first end of the first switch and the first end of the second switch serve together as the battery current input end of the pre-charging circuit, the second end of the second switch is connected to the first end of the current limiting resistor, and the second end of the current limiting resistor and the second end of the first switch serve together as the battery current output end of the pre-charging circuit.

4. The electric power system according to claims 1-3, characterized in that: It also includes an AC charging circuit, a DC charging interface, and a charging switch; The first end of the DC charging interface and the first end of the AC charging circuit are connected to the second node, and the second end of the DC charging interface is connected to the first end of the charging switch; The second end of the AC charging circuit and the second end of the charging switch are commonly connected to a power ground; The AC charging circuit is configured to convert the input AC power into a first DC power to charge the first power source and / or the second power source; The DC charging interface is configured to receive a second DC power and transfer the second DC power to charge the first power source and / or the second power source.

5. The electric power system according to claim 1, wherein: Also includes a third power supply to an nth power supply, a third load to an mth load, and a third battery switch to an nth battery switch; The positive electrode of the third power source and the positive electrode of the nth power source are connected to the first node, the negative electrode of the i-th power source is connected to the first end of the i-th battery switch, and the first end of the third load and the first end of the m-th load are connected to the second node. The second end of the third load to the second end of the mth load, and the second end of the third battery switch to the second end of the nth battery switch are commonly connected to a power ground; Wherein, i is an integer greater than or equal to 3 and less than or equal to n; n and m are both integers greater than 2.

6. The electric power system according to claim 1, wherein: Also includes a first current limiting circuit and a second current limiting circuit; The first current limiting circuit is connected between the first node and the positive electrode of the first power supply, and the second current limiting circuit is connected between the first node and the positive electrode of the second power supply; The first current limiting circuit is configured to limit the first battery current output by the first power supply; The second current limiting circuit is configured to limit the second battery current output by the second power supply.

7. The electric power system according to claim 1, wherein: Also included is a first collision switch circuit and a second collision switch circuit; The first collision switch circuit is connected between the negative electrode of the first power supply and the power ground, and the second collision switch circuit is connected between the negative electrode of the second power supply and the power ground; The first collision switch circuit is configured to disconnect the first power source from the power ground when a collision occurs in the electric power system; The second collision switch circuit is configured to disconnect the second power source from the power ground when a collision occurs in the electric power system.

8. The electric power system according to claim 1, wherein: The first load M1 includes a first load switch and a first motor, and the second load includes a second load switch and a second motor; The first end of the first motor serves as the first end of the first load, the second end of the first motor is connected to the first end of the first load switch, and the second end of the first load switch serves as the second end of the first load; The first end of the second motor serves as the first end of the second load, the second end of the second motor is connected to the first end of the second load switch, and the second end of the second load switch serves as the second end of the second load.

9. An electric vehicle, characterized in that: The electric vehicle comprises the electric power system according to any one of claims 1 to 6.

10. A driving control method for an electric power system according to claim 1, characterized in that: include: According to the driving instruction, the electric power system is controlled to operate in a corresponding operating mode, wherein the operating mode includes: First operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be opened, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be disconnected from the second node and the power ground so that the second load stops operating; Second operating mode: Control the first battery switch to be disconnected, control the second battery switch to be closed, control the first load to be connected between the second node and the power ground so that the first load operates, and control the second load to stop being connected between the second node and the power ground so that the second load stops operating; A third operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be opened, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating; Fourth operating mode: controlling the first battery switch to be disconnected, controlling the second battery switch to be closed, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating; Fifth operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to stop being connected between the second node and the power ground so that the second load stops operating; Sixth operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the second load to be connected between the second node and the power ground so that the second load operates, and controlling the first load to stop being connected between the second node and the power ground so that the first load stops operating; Seventh operating mode: controlling the first battery switch to be closed, controlling the second battery switch to be open, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates; Eighth operating mode: controlling the first battery switch to be disconnected, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates; Ninth working mode: controlling the first battery switch to be closed, controlling the second battery switch to be closed, controlling the first load to be connected between the second node and the power ground so that the first load operates, and controlling the second load to be connected between the second node and the power ground so that the second load operates.

11. The driving control method according to claim 10, wherein: Also includes: In the first working mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the first load maintains operation; In the second working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the first load maintains operation; In the third working mode, when a failure of the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the second load maintains operation; In the fourth working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the second load maintains operation; In the fifth working mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the first load maintains operation; In the fifth working mode, when a fault is detected in the second power supply, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the first load maintains operation; In the sixth operating mode, when a fault in the first power supply is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the second load maintains operation; In the sixth working mode, when a fault of the second power supply is detected, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the second load maintains operation; In the seventh working mode, when a fault of the first power source is detected, the first battery switch is controlled to be disconnected and the second battery switch is controlled to be closed so that the first load and the second load maintain operation simultaneously; In the eighth working mode, when a fault of the second power source is detected, the second battery switch is controlled to be disconnected and the first battery switch is controlled to be closed so that the first load and the second load maintain operation simultaneously; In the ninth operating mode, when a fault in the first power source is detected, the first battery switch is controlled to be disconnected and the second battery switch is kept closed so that the first load and the second load maintain operation simultaneously; In the ninth operating mode, when a fault in the second power source is detected, the second battery switch is controlled to be disconnected and the first battery switch is kept closed so that the first load and the second load maintain operation simultaneously.

12. The driving control method according to claim 10, wherein: Also includes: In the first operating mode, the fifth operating mode, the sixth operating mode, the seventh operating mode, the eighth operating mode, and the ninth operating mode, when a fault is detected in the first load, the first load is controlled to stop being connected between the second node and the power ground, so that the first load stops operating, and the second load is controlled or maintained to be connected between the second node and the power ground, so that the second load operates or maintains operating; In the second operating mode, the third operating mode, the fourth operating mode, the seventh operating mode, the eighth operating mode and the ninth operating mode, when a fault is detected in the second load, the first load is controlled or maintained to be connected between the second node and the power ground so that the first load works or maintains working, and the second load is controlled to stop being connected between the second node and the power ground so that the second load stops working.

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