Electric power system and electric vehicles

Abstract

An electric power system comprises a first power source (B1), a first battery switch (KB1), a second power source (B2), a second battery switch (KB2), an isolating switch (KG), a first load (M1) and a second load (M2); the positive electrode of the first power source (B1), the first end of the first load (M1) and the first end of the isolating switch (KG) are connected to a first node (X1); the positive electrode of the second power source (B2), the first end of the second load (M2) and the second end of the isolating switch (KG) are connected to a second node (X2); the positive electrode of the first power source (B1) is connected to the first end of the first battery switch (KB1), and the positive electrode of the second power source (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 power switch (KB2) are connected to a power ground. The electric power system can realize front-wheel drive, rear-wheel drive and four-wheel drive functions through three switches, has a simple control strategy and low cost, and improves the reliability of the electric power system. An electric vehicle with the electric power system is also provided.

Description

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 the decreasing oil resources and the increasingly serious environmental pollution, protecting the environment, saving energy and reducing emissions have become the current trend in the world. Against this background, in recent years, electric vehicles with batteries as the main power source have gradually appeared and increased. The carbon emissions of electric vehicles are less than those of traditional internal combustion engine vehicles. Pure electric vehicles even have zero carbon emissions and have the characteristics of high energy conversion efficiency. This makes people regard electric vehicles as an important choice to replace internal combustion engine vehicles in the future. As a core component in electric vehicles, the electric power system has received extensive attention.

[0003] Related electric power systems such as Figure 1 As shown, on the one hand, the large number of switches used leads to a complex control strategy and high cost. On the other hand, since there is no redundancy in the load circuit, the requirements of the vehicle's four-wheel drive cannot be met.

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

[0005] In view of the above problems, the present application provides an electric power system and an electric vehicle, aiming to solve the problem of related electric power systems having four-wheel drive requirements and complex control strategies.

[0006] In a first aspect, the present application provides an electric power system according to an embodiment of the present application, including:

[0007] It includes a first power source, a first battery switch, a second power source, a second battery switch and an isolating switch;

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

[0009] The positive electrode of the first power source is connected to the first end of the first battery switch, and the positive electrode of the second power source 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 the first power supply, the first battery switch and the first load form a first circuit, the second power supply, the second battery switch and the second load form a second circuit, and an isolation switch is provided between the two circuits, the front-wheel drive, rear-wheel drive and four-wheel drive functions can be realized by only providing three switches, and the control strategy is simple and the cost is low; and 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 driving control method of the above-mentioned electric power system, including:

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

[0014] The first working mode: controlling the first battery switch to be closed to make the first load work, and controlling the second battery switch and the isolation switch to be opened to make the second load stop working.

[0015] The second working mode: controlling the second battery switch to be closed to make the second load work, and controlling the first battery switch and the isolation switch to be opened to make the first load stop working.

[0016] The third working mode: controlling the first battery switch, the second battery switch and the isolation switch to be closed so that the first load and the second load work simultaneously.

[0017] By adopting the above solution, since the first power supply B1 and the second power supply B2 are connected in parallel, the switching between the three modes will not cause the circuit voltage to change, so the load can still work normally. Under this architecture, the power supply and the electric drive system are both redundantly designed, which greatly improves the safety of the electric power system and supports the functional safety requirements of L4 / L5 for the electric power system.

[0018] In some embodiments, it also includes:

[0019] In the first working mode, when a failure of the first power supply is detected, the second battery switch is controlled to be closed to make the second load work, and the first battery switch and the isolation switch are controlled to be opened to stop the first load from working.

[0020] By adopting the above solution, when the front drive function is used and the first power supply B1 fails (front drive function failure), the rear drive function replaces the front drive function by connecting the second circuit and disconnecting the first circuit;

[0021] In some embodiments, the electric power system further comprises:

[0022] a first pre-charging circuit, connected between the positive electrode of the first power source and the first node, configured to first limit and transfer the first battery current output by the first power source, and then transfer the first battery current;

[0023] The second pre-charging circuit is connected between the positive electrode of the second power source and the second node, and is configured to first limit and transfer the second battery current output by the second power source, and then transfer the second battery current.

[0024] By adopting the above solution, the battery current is limited and then transferred, thereby improving the reliability and safety of the electric power system.

[0025] In some embodiments, the first pre-charging circuit and the second pre-charging circuit both include a pre-charging module, and the pre-charging module includes a first switch, a second switch, and a current limiting resistor;

[0026] The first end of the first switch and the first end of the second switch serve together as the battery voltage input end of the pre-charging module, 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 voltage output end of the pre-charging module.

[0027] By adopting the above solution, the pre-charging circuit has a simple structure and low cost.

[0028] In some embodiments, the electric power system further comprises:

[0029] A first AC charging circuit, a second AC charging circuit, a DC charging interface, and a charging switch;

[0030] The first end of the DC charging interface and the first end of the first AC charging circuit are connected to a first node, the second end of the DC charging interface is connected to the first end of the charging switch, and the first end of the second AC charging circuit is connected to a second node;

[0031] The second end of the first AC charging circuit, the second end of the second AC charging circuit and the second end of the charging switch are commonly connected to a power ground;

[0032] The first 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;

[0033] The second AC charging circuit is configured to convert the input AC power into a second DC power to charge the first power source and / or the second power source;

[0034] The DC charging interface is configured to receive a third DC power and transfer the third DC power to charge the first power source and / or the second power source.

[0035] By adopting the above solution, a first AC charging circuit, a second AC charging circuit, and a DC charging interface are provided, so that AC charging and DC charging of the power supply are realized, enriching the functions of the product.

[0036] In one of the embodiments, a third power source is also included;

[0037] The positive electrode of the third power source is connected to the third end of the first AC charging circuit and the third end of the second AC charging circuit; the negative electrode of the third power source is connected to the power ground;

[0038] The first AC charging circuit is further configured to convert the input AC power into a third DC power to charge the third power source;

[0039] The second AC charging circuit is further configured to convert the input AC power into a fourth DC power to charge the third power source.

[0040] By adopting the above solution, a third power source is provided to power the control system, and a third terminal is set in the first AC charging circuit 21 and the second AC charging circuit 22, so as to realize charging of the low-voltage third power source and enrich the functions of the product.

[0041] In one embodiment, the first battery switch and the second battery switch include relays; and the isolation switch includes a contactor.

[0042] By adopting the above solution, the relay realizes the battery switch and the contactor realizes the isolation switch, which is simple and reliable.

[0043] In a second aspect, an embodiment of the present invention further provides an electric vehicle, which includes the above-mentioned electric power system.

[0044] 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

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0046] Figure 1 A structural schematic diagram of a related electric power system;

[0047] Figure 2 is another structural schematic diagram of a related electric power system;

[0048] Figure 3 A schematic diagram of a structure of an electric power system provided in one embodiment of the present application;

[0049] Figure 4 Another structural schematic diagram of an electric power system provided in one embodiment of the present application;

[0050] Figure 5 A partial exemplary circuit schematic diagram of an electric power system provided in one embodiment of the present application;

[0051] Figure 6 Another structural schematic diagram of an electric power system provided in one embodiment of the present application;

[0052] Figure 7 Another structural schematic diagram of an electric power system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] 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).

[0059] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] At present, from the perspective of market development, the application of power systems is becoming more and more extensive. Power systems are widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power systems, the market demand is also constantly expanding.

[0062] As power systems are widely used in electric vehicles, the related electric power systems do not involve redundancy in the load circuit and cannot meet the requirements of vehicle four-wheel drive. In recent years, electric power systems containing multiple motor systems have emerged, such as Figure 2 As shown, it specifically includes: a plurality of motor systems 7, each motor system 7 is connected through a clutch 8; a plurality of battery packs or batteries 1, each battery pack or battery 1 is electrically connected to each motor system 7 in the plurality of motor systems 7 through a switch device 10, and is used to supply power to the motor system 7 or receive power from the motor system 7; a battery state detection device 9 is electrically connected to each battery pack or battery 1 in the plurality of battery packs or batteries 1, and is used to detect the state of each battery pack or battery 1; and a controller 2 is electrically connected to the battery state detection device 9 and the switch device 10, and is used to control the clutch 8 and the switch device 10 according to the power demand of the load of the motor power system and the state of each battery pack or battery 1, so as to determine the motor system 7 connected through the clutch 8 and the battery pack or battery 1 electrically connected to the motor system 7. Since the switch device 10 includes a large number of switches, the control strategy is complex and the cost is high.

[0063] In order to solve the problem of complex and high cost control strategy, the applicant found that different power supply circuits can be configured for different loads (motor systems) in design, and different power supply circuits can be connected, thereby reducing the number of switches, simplifying the complexity of the control strategy and reducing costs.

[0064] The electric power system disclosed in the embodiments of the present application can be used for an electric device that uses the electric power system as a driving device. The electric device can be, but is not limited to, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0065] 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.

[0066] The electric vehicle is provided with a power supply inside, which can be arranged at the bottom, head or tail of the electric vehicle. The power supply can be used to power the electric vehicle, and the electric vehicle can also include a controller and a motor, and the controller is used to control the power supply to power the motor, for example, for the working power demand of the electric vehicle when starting and driving.

[0067] In some embodiments of the present application, the power source can be used 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.

[0068] According to some embodiments of the present application, referring to Figure 3 , Figure 3 A schematic diagram of the structure of an electric power system provided by an embodiment of the present application is shown. For the sake of convenience, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0069] The electric power system is connected to the first load M1 and the second load M2, and includes a first power source B1, a first battery switch KB1, a second power source B2, a second battery switch KB2 and an isolating switch KG.

[0070] The positive electrode of the first power supply B1, the first end of the first load M1 and the first end of the isolation switch KG are connected to the first node X1, and the positive electrode of the second power supply B2, the first end of the second load M2 and the second end of the isolation switch KG are connected to the second node X2; the positive electrode of the first power supply B1 is connected to the first end of the first battery switch KB1, and the positive 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.

[0071] The first power source B1, the first battery switch KB1 and the first load M1 form a first loop, the second power source B2, the second battery switch KB2 and the second load M2 form a second loop, and an isolation switch KG is provided between the two loops.

[0072] It is understandable that both the first power source B1 and the second power source B2 may be battery packs.

[0073] Figure 3 The working modes of the electric power system shown are divided into three working modes, as follows:

[0074] In the first working mode, the first battery switch KB1 is closed, and the second battery switch KB2 and the isolating switch KG are disconnected. At this time, the first load M1 is working and the second load M2 is stopped. In the second working mode, the second battery switch KB2 is closed and the first battery switch KB1 and the isolating switch KG are disconnected. At this time, the second load M2 is working and the first load M1 is stopped. In the third working mode, the first battery switch KB1, the second battery switch KB2 and the isolating switch KG are all closed. At this time, the first load M1 and the second load M2 are working at the same time.

[0075] when Figure 3 When a fault occurs in the electric power system shown, the working principle is as follows:

[0076] In the first working mode, when the first power supply B1 fails, the second battery switch KB2 is closed, and the first battery switch KB1 and the isolating switch KG are disconnected. At this time, the second load M2 works and the first load M1 stops working; thereby, the switching from the first load M1 to the second load M2 is realized. In the second working mode, when the second power supply B2 fails, the first battery switch KB1 is closed, and the second battery switch KB2 and the isolating switch KG are disconnected. At this time, the first load M1 works and the second load M2 stops working; thereby, the switching from the second load M2 to the first load M1 is realized. In the third working mode, the second battery switch KB2 is controlled to be closed to make the second load M2 work, and the first battery switch KB1 and the isolating switch KG are controlled to be disconnected to make the first load M1 stop working, and when the second power supply B2 fails, the first battery switch KB1 is controlled to be closed to make the first load M1 work, and the second battery switch KB2 and the isolating switch KG are controlled to be disconnected to make the second load M2 stop working. In the third working mode, when the first power supply B1 fails, the second battery switch KB2 is closed and the first battery switch KB1 and the isolating switch KG are disconnected. At this time, the second load M2 works and the first load M1 stops working. When the second power supply B2 fails, the first battery switch KB1 is closed and the second battery switch KB2 and the isolating switch KG are disconnected. At this time, the first load M1 works and the second load M2 stops working.

[0077] Since two independent circuits are set up and an isolating switch is set between the two circuits, the front-wheel drive, rear-wheel drive and four-wheel drive functions can be realized by setting only three 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 supply is located is not affected, thereby improving the reliability of the electric power system.

[0078] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 , Figure 4 A schematic diagram of the structure of an electric power system provided by another embodiment of the present application is shown. For the sake of convenience, only the parts related to this embodiment are shown, which are described in detail as follows:

[0079] The above electric power system is Figure 3 In addition to all the components and assemblies of the electric power system shown, the electric power system also includes a first pre-charging circuit 11 and a second pre-charging circuit 12.

[0080] The first pre-charging circuit 11 is connected between the positive electrode of the first power source B1 and the first node X1, and is configured to first limit and transfer the first battery current output by the first power source B1, and then transfer the first battery current.

[0081] The second pre-charging circuit 12 is connected between the positive electrode of the second power source B2 and the second node X2, and is configured to first limit and transfer the second battery current output by the second power source B2, and then transfer the second battery current.

[0082] Figure 4 The working modes of the electric power system shown are divided into three working modes, as follows:

[0083] In the fourth working mode, the first pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are disconnected. At this time, the first load M1 is working and the second load M2 is stopped. In the fifth working mode, the second battery switch KB2 is closed, the second pre-charging circuit 12 is turned on, and the first pre-charging circuit 11, the first battery switch KB1 and the isolation switch KG are disconnected. At this time, the second load M2 is working and the first load M1 is stopped. In the sixth working mode, the first battery switch KB1, the second battery switch KB2 and the isolation switch KG are closed and the first pre-charging circuit 11 and the second pre-charging circuit 12 are turned on. At this time, the first load M1 and the second load M2 are working at the same time.

[0084] When the power supply discharges, there will be a large current. By setting up a pre-charging circuit, the large current at the moment of discharge can be prevented and the load can be protected.

[0085] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The first pre-charging circuit 11 and the second pre-charging circuit 12 both include a pre-charging module, and the pre-charging module includes a first switch K1, a second switch K2 and a current limiting resistor R.

[0086] The first end of the first switch K1 and the first end of the second switch K2 serve together as the battery voltage input end of the pre-charging module, the second end of the second switch K2 is connected to the first end of the current limiting resistor R, and the second end of the current limiting resistor R and the second end of the first switch K1 serve together as the battery voltage output end of the pre-charging module.

[0087] The pre-charging circuit 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.

[0088] The above pre-charging circuit has a simple structure and low cost.

[0089] According to some embodiments of the present application, optionally, both the first switch and the second switch include relays, and the current limiting resistor includes a thermistor.

[0090] 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.

[0091] At the moment of power-on, lightning strike or static electricity, the thermistor will generate a very large surge current. The current flowing through will suddenly exceed its rated current, the thermistor will heat up, and the resistance value will instantly show high impedance, which will inhibit the current from flowing to the subsequent circuit and play a current limiting role. After the current returns to normal, the impedance decreases and the thermistor returns to a low impedance state.

[0092] Thermistors are used to prevent inrush current at startup.

[0093] According to some embodiments of the present application, optionally, please continue to refer to Figure 6 , Figure 6 A schematic diagram of the structure of an electric power system provided by another embodiment of the present application is shown. For the sake of convenience, only the parts related to this embodiment are shown, which are described in detail as follows:

[0094] The above electric power system is Figure 4 In addition to all the components and assemblies of the electric power system shown, it also includes a first AC charging circuit 21, a second AC charging circuit 22, a DC charging interface 10 and a charging switch KC.

[0095] A first end of the DC charging interface 10 and a first end of the first AC charging circuit 21 are connected to a first node X1, a second end of the DC charging interface 10 is connected to a first end of the charging switch KC, and a first end of the second AC charging circuit 22 is connected to a second node X2; a second end of the first AC charging circuit 21, a second end of the second AC charging circuit 22, and a second end of the charging switch KC are connected to a power ground.

[0096] The first AC charging circuit 21 is configured to convert the input AC power into a first DC power to charge the first power source B1 and / or the second power source B2.

[0097] The second AC charging circuit 22 is configured to convert the input AC power into a second DC power to charge the first power source B1 and / or the second power source B2.

[0098] The DC charging interface 10 is configured to receive a third DC power and transfer the third DC power to charge the first power source B1 and / or the second power source B2.

[0099] The AC charging circuit may be a switching power supply. The DC charging interface 10 may be a connector.

[0100] Figure 6 The DC charging mode of the electric power system shown is divided into three DC charging modes, as follows:

[0101] In the first DC charging mode, the first pre-charging circuit 11 is turned on, the charging switch KC and the first battery switch KB1 are closed, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are disconnected. At this time, the first power supply B1 is charged, and the second power supply B2 is stopped from being charged. In the second DC charging mode, the second pre-charging circuit 12 is turned on, the charging switch KC, the isolation switch KG and the second battery switch KB2 are closed, and the first battery switch KB1 and the first pre-charging circuit 11 are disconnected. At this time, the second power supply B2 is charged, and the first power supply B1 is stopped from being charged. In the third DC charging mode, the charging switch KC, the isolation switch KG, the first battery switch KB1 and the second battery switch KB2 are closed, and the first pre-charging circuit 11 and the second pre-charging circuit 12 are turned on. At this time, the first power supply B1 and the second power supply B2 are charged at the same time.

[0102] In the first AC charging mode, the first AC charging circuit 21 is connected to the AC power, the first pre-charging circuit 11 is turned on, the first battery switch KB1 is closed, and the second pre-charging circuit 12, the second battery switch KB2, the charging switch KC and the isolation switch KG are disconnected. At this time, the first power supply B1 is charged, and the second power supply B2 is stopped from being charged. In the second AC charging mode, the second AC charging circuit 22 is connected to the AC power, the second pre-charging circuit 12 is turned on, the second battery switch KB2 is closed, and the isolation switch KG, the charging switch KC, the first battery switch KB1 and the first pre-charging circuit 11 are disconnected. At this time, the second power supply B2 is charged, and the first power supply B1 is stopped from being charged. In the third AC charging mode, the first AC charging circuit 21 is connected to the AC power, the first pre-charging circuit 11, the charging switch KC and the first battery switch KB1 are disconnected, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are closed. At this time, the second power supply B2 is charged, and the first power supply B1 is stopped from being charged. In the fourth AC charging mode, the second AC charging circuit 22 is connected to AC power, the charging switch KC, the second pre-charging circuit 12 and the second battery switch KB2 are disconnected, and the isolation switch KG, the first battery switch KB1 and the first pre-charging circuit 11 are closed. At this time, the first power supply B1 is charged, and the charging of the second power supply B2 is stopped.

[0103] In the fifth AC charging mode, both the first AC charging circuit 21 and the second AC charging circuit 22 are connected to AC power, the first pre-charging circuit 11, the charging switch KC and the first battery switch KB1 are disconnected, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are closed. At this time, the second power supply B2 is charged, and the first power supply B1 is stopped from being charged. In the sixth AC charging mode, both the first AC charging circuit 21 and the second AC charging circuit 22 are connected to AC power, the charging switch KC, the second pre-charging circuit 12 and the second battery switch KB2 are disconnected, and the isolation switch KG, the first battery switch KB1 and the first pre-charging circuit 11 are closed. At this time, the first power supply B1 is charged, and the second power supply B2 is stopped from being charged. In the seventh AC charging mode, both the first AC charging circuit 21 and the second AC charging circuit 22 are connected to AC power, the charging switch KC is disconnected, and the second pre-charging circuit 12, the second battery switch KB2, the isolation switch KG, the first battery switch KB1 and the first pre-charging circuit 11 are closed, and the first power supply B1 and the second power supply B2 are charged at the same time.

[0104] In the eighth AC charging mode, the first AC charging circuit 21 is connected to the AC power, the charging switch KC is disconnected, and the second pre-charging circuit 12, the second battery switch KB2, the isolation switch KG, the first battery switch KB1 and the first pre-charging circuit 11 are closed, and the first power supply B1 and the second power supply B2 are charged at the same time. In the ninth AC charging mode, the second AC charging circuit 22 is connected to the AC power, the charging switch KC is disconnected, and the second pre-charging circuit 12, the second battery switch KB2, the isolation switch KG, the first battery switch KB1 and the first pre-charging circuit 11 are closed, and the first power supply B1 and the second power supply B2 are charged at the same time.

[0105] By providing a first AC charging circuit, a second AC charging circuit, and a DC charging interface, AC charging and DC charging of the power supply are realized, enriching the functions of the product.

[0106] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 , Figure 7 A schematic diagram of the structure of an electric power system provided by another embodiment of the present application is shown. For the sake of convenience, only the parts related to this embodiment are shown, which are described in detail as follows:

[0107] The above electric power system is Figure 6 In addition to all components and assemblies of the electric power system shown, a third power source B3 is also included. It is understandable that the third power source B3 can be a battery, as an example but not a limitation, and the third power source B3 is used to power the control system.

[0108] The positive electrode of the third power source B3 is connected to the third end of the first AC charging circuit 21 and the third end of the second AC charging circuit 22; the negative electrode of the third power source B3 is connected to the power ground;

[0109] The first AC charging circuit 21 is further configured to convert the input AC power into a third DC power to charge the third power source B3;

[0110] The second AC charging circuit 22 is further configured to convert the input AC power into a fourth DC power to charge the third power source B3.

[0111] In the tenth AC charging mode, the first AC charging circuit 21 is connected to the AC power, and the third DC power is output from the third end of the first AC charging circuit 21 to charge the third power source B3. In the eleventh AC charging mode, the second AC charging circuit 22 is connected to the AC power, and the fourth DC power is output from the third end of the second AC charging circuit 22 to charge the third power source B3. In the twelfth AC charging mode, both the first AC charging circuit 21 and the second AC charging circuit 22 are connected to the AC power, and the third DC power is output from the third end of the first AC charging circuit 21, and the fourth DC power is output from the third end of the second AC charging circuit 22, and the third DC power and the fourth DC power are both used to charge the third power source B3.

[0112] By providing the third power source B3 and setting the third terminal in the first AC charging circuit 21 and the second AC charging circuit 22, charging of the low-voltage third power source B3 is achieved, thereby enriching the functions of the product.

[0113] According to some embodiments of the present application, optionally, the first battery switch and the second battery switch include relays; and the isolation switch includes a contactor.

[0114] The relay may be an electromagnetic relay, an induction relay, an electric relay, an electronic relay, etc., which are not limited here. The contactor may be an electromagnetic contactor, a permanent magnet contactor, etc., which are not limited here.

[0115] The battery switch is realized by a relay, and the isolating switch is realized by a contactor, which is simple and reliable.

[0116] According to some embodiments of the present application, the present application also provides an electric vehicle, comprising the electric power system described in any of the above schemes.

[0117] It should be noted that electric vehicles may also include a battery management system and a controller; the battery management system is used to intelligently manage and maintain each power source, prevent overcharging and over-discharging of the power source, extend the service life of the power source, and monitor the status of the power source; 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.

[0118] Since the electric vehicle includes the electric power system described in any of the above schemes, it can realize front-wheel drive, rear-wheel drive and four-wheel drive functions, and the control strategy is simple and the cost is low; and when any power supply fails, it does not affect the driving function of the circuit where the other power supplies are located, thereby improving the reliability of the electric vehicle.

[0119] According to some embodiments of the present application, there is also provided a Figure 3 The driving control method of the electric power system shown includes controlling the electric power system to operate in a corresponding working mode according to a driving instruction, wherein the working mode includes a first working mode to a third working mode.

[0120] The first working mode: the first battery switch KB1 is controlled to be closed to make the first load M1 work, and the second battery switch KB2 and the isolation switch KG are controlled to be opened to make the second load M2 stop working.

[0121] The second working mode: the second battery switch KB2 is controlled to be closed to make the second load M2 work, and the first battery switch KB1 and the isolation switch KG are controlled to be opened to make the first load M1 stop working.

[0122] The third working mode: the first battery switch KB1, the second battery switch KB2 and the isolation switch KG are controlled to be closed so that the first load M1 and the second load M2 work simultaneously.

[0123] The first power source B1, the first battery switch KB1 and the first load M1 form a first loop, the second power source B2, the second battery switch KB2 and the second load M2 form a second loop, and an isolation switch KG is provided between the two loops.

[0124] For example, when the electric vehicle is traveling on a road with fewer bends and fewer slopes, the electric power system can be controlled to operate in the first operating mode. At this time, the first battery switch KB1 is controlled to close to make the front drive motor (first load M1) work, and the second battery switch KB2 and the isolation switch KG are controlled to disconnect to stop the rear drive motor (second load M2); the electric vehicle operates in the front drive mode. When the electric vehicle is traveling on a road with more bends and fewer slopes, the electric power system can be controlled to operate in the second operating mode. At this time, the second battery switch KB2 is controlled to close to make the rear drive motor (second load M2) work, and the first battery switch KB1 and the isolation switch KG are controlled to disconnect to stop the front drive motor (first load M1); the electric vehicle operates in the rear drive mode. When the electric vehicle is traveling on a road with many curves and slopes, the electric power system can be controlled to operate in the third operating mode. At this time, the first battery switch KB1, the second battery switch KB2 and the isolation switch KG are controlled to be closed so that the front drive motor (first load M1) and the rear drive motor (second load M2) work at the same time, that is, the electric vehicle operates in the four-wheel drive mode.

[0125] By connecting the first circuit by only closing the first battery switch KB1 in the first working mode, the front-wheel drive function can be realized; by connecting the second circuit by only closing the second battery switch KB2 in the second working mode, the rear-wheel drive function can be realized; by connecting the first circuit and the second circuit by closing all switches in the third working mode, the four-wheel drive function can be realized and the battery voltage can be balanced at the same time; therefore, the control strategy is simple and the cost is low.

[0126] Since the first power supply B1 and the second power supply B2 are connected in parallel, switching between the three modes will not cause the circuit voltage to change, so the load can still work normally. Under this architecture, the power supply and the electric drive system are both redundantly designed, which greatly improves the safety of the electric power system and supports the functional safety requirements of L4 / L5 for the electric power system.

[0127] According to some embodiments of the present application, optionally, in the first working mode, when a fault is detected in the first power supply B1, the second battery switch KB2 is controlled to close to make the second load M2 work, and the first battery switch KB1 and the isolation switch KG are controlled to open to stop the first load M1 from working.

[0128] For example, when the electric vehicle operates in the front-drive working mode (first working mode), that is, the first battery switch KB1 is controlled to be closed to make the front-drive motor (first load M1) work, and the second battery switch KB2 and the isolating switch KG are controlled to be disconnected to make the rear-drive motor (second load M2) stop working, a fault is detected in the first power supply B1, such as undervoltage or overcurrent, and the electric vehicle switches from the front-drive working mode to the rear-drive working mode (second working mode), that is, the second battery switch KB2 is controlled to be closed to make the rear-drive motor (second load M2) work, and the first battery switch KB1 and the isolating switch KG are controlled to be disconnected to make the front-drive motor (first load M1) stop working.

[0129] When the front drive function is used and the first power supply B1 fails (front drive function failure), the rear drive function replaces the front drive function by connecting the second circuit and disconnecting the first circuit, thereby improving the reliability of the electric power system.

[0130] According to some embodiments of the present application, optionally, in the second operating mode, when a fault is detected in the second power supply B2, the first battery switch KB1 is controlled to close to enable the first load M1 to operate, and the second battery switch KB2 and the isolation switch KG are controlled to open to enable the second load M2 to stop operating.

[0131] For example, when the electric vehicle is operating in the rear-wheel drive operating mode (second operating mode), that is, the second battery switch KB2 is controlled to be closed to enable the rear-wheel drive motor (second load M2) to operate, and the first battery switch KB1 and the isolating switch KG are controlled to be disconnected to enable the front-wheel drive motor (first load M1) to stop operating, a fault is detected in the second power supply B2, such as undervoltage or overcurrent, and the electric vehicle is switched from the rear-wheel drive operating mode to the front-wheel drive operating mode (first operating mode), that is, the first battery switch KB1 is controlled to be closed to enable the front-wheel drive motor (first load M1) to operate, and the second battery switch KB2 and the isolating switch KG are controlled to be disconnected to enable the rear-wheel drive motor (second load M2) to stop operating.

[0132] When the rear-drive function is used and the second power supply B2 fails (rear-drive function failure), the front-drive function replaces the rear-drive function by connecting the first circuit and disconnecting the second circuit, thereby improving the reliability of the electric power system.

[0133] According to some embodiments of the present application, optionally, in the third operating mode, when a fault is detected in the first power supply B1, the second battery switch KB2 is controlled to be closed to enable the second load M2 to work, and the first battery switch KB1 and the isolating switch KG are controlled to be disconnected to stop the first load M1 from working, and when a fault is detected in the second power supply B2, the first battery switch KB1 is controlled to be closed to enable the first load M1 to work, and the second battery switch KB2 and the isolating switch KG are controlled to be disconnected to stop the second load M2 from working.

[0134] For example, when the electric vehicle is operating in the four-wheel drive working mode (third working mode), the first battery switch KB1, the second battery switch KB2 and the isolating switch KG are controlled to be closed so that the front drive motor (first load M1) and the rear drive motor (second load M2) work at the same time. When a fault is detected in the second power supply B2, such as undervoltage or overcurrent, the electric vehicle switches from the four-wheel drive working mode to the front drive working mode (first working mode), that is, the first battery switch KB1 is controlled to be closed so that the front drive motor (first load M1) works, and the second battery switch KB2 and the isolating switch KG are controlled to be disconnected so that the rear drive motor (second load M2) stops working. By analogy, it can be concluded that the four-wheel drive working mode is switched to the rear drive working mode (second working mode), which will not be repeated here.

[0135] When the four-wheel drive function is used and the first power supply B1 or the second power supply B2 fails (front-wheel drive function or rear-wheel drive function failure), the corresponding circuit and isolation switch KG are disconnected to realize the front-wheel drive or rear-wheel drive replacing the four-wheel drive function; therefore, when any power supply fails, it does not affect the driving function of the circuit where the other power supplies are located, thereby improving the reliability of the electric power system.

[0136] According to some embodiments of the present application, there is also provided a Figure 4 The driving control method of the electric power system shown includes controlling the electric power system to operate in a corresponding working mode according to a driving instruction, wherein the working mode includes a fourth working mode to a sixth working mode.

[0137] In the fourth working mode, the first battery switch KB1 is closed and the first pre-charging circuit 11 is turned on to make the first load M1 work, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are turned off to stop the second load M2 from working.

[0138] In the fifth working mode, the second battery switch KB2 is closed and the second pre-charging circuit 12 is turned on to make the second load M2 work, and the first pre-charging circuit 11, the first battery switch KB1 and the isolation switch KG are turned off to stop the first load M1 from working.

[0139] In the sixth working mode, the first battery switch KB1, the second battery switch KB2 and the isolation switch KG are controlled to be closed and the first pre-charging circuit 11 and the second pre-charging circuit 12 are controlled to be turned on so that the first load M1 and the second load M2 work simultaneously.

[0140] It should be noted that controlling the pre-charging circuit to be turned on specifically includes: after closing the second switch K2 for a preset time, closing the first switch K1 and opening the second switch K2.

[0141] For example, when the electric vehicle is traveling on a road with fewer bends and fewer slopes, the electric power system can be controlled to operate in the fourth operating mode. At this time, the first battery switch KB1 is controlled to be closed and the first pre-charging circuit 11 is controlled to be turned on to make the front drive motor (first load M1) work, and the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG are controlled to be disconnected to stop the rear drive motor (second load M2); that is, the electric vehicle operates in the front drive mode. When the electric vehicle is traveling on a road with more bends and fewer slopes, the electric power system can be controlled to operate in the fifth operating mode. At this time, the second battery switch KB2 is controlled to be closed and the second pre-charging circuit 12 is controlled to be turned on to make the rear drive motor (second load M2) work, and the first pre-charging circuit 11, the first battery switch KB1 and the isolation switch KG are controlled to be disconnected to stop the front drive motor (first load M1); that is, the electric vehicle operates in the rear drive mode. When an electric vehicle is traveling on a road with many curves and slopes, the electric power system can be controlled to operate in the sixth operating mode. At this time, the first battery switch KB1, the second battery switch KB2 and the isolation switch KG are controlled to be closed and the first pre-charging circuit 11 and the second pre-charging circuit 12 are controlled to be turned on so that the front drive motor (first load M1) and the rear drive motor (second load M2) work at the same time, that is, the electric vehicle operates in the four-wheel drive mode.

[0142] In the fourth working mode to the sixth working mode, the load is pre-discharged (the battery current is limited) and then the load is normally discharged, thereby preventing the load from being damaged by high voltage shock.

[0143] According to some embodiments of the present application, there is also provided a Figure 6 The charging control method of the electric power system shown includes: controlling the charging switch KC and the first battery switch KB1 to close and controlling the first pre-charging circuit 11 to turn on to charge the first power source B1, and controlling the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG to turn off to stop charging the second power source B2.

[0144] When only the first power supply B1 is detected to be undervoltage and the voltage of the second power supply B2 is normal, the front-wheel drive working mode and the four-wheel drive working mode cannot be used. At this time, only the first power supply B1 needs to be charged. The charging control method is to control the charging switch KC and the first battery switch KB1 to be closed and control the first pre-charging circuit 11 to be turned on, and control the second pre-charging circuit 12, the second battery switch KB2 and the isolation switch KG to be disconnected.

[0145] The first pre-charging circuit 11, the DC charging interface 10, the charging switch KC, the first power source B1 and the first battery switch KB1 constitute a first charging circuit, and only the first charging circuit is connected to charge only the first power source B1; therefore, the control strategy is simple and the cost is low. At the same time, by pre-charging the power source (charging current is limited) and then charging the power source normally, the power source is prevented from being damaged by high voltage shock.

[0146] According to some embodiments of the present application, there is also provided a Figure 6 The charging control method of the electric power system shown includes: controlling the charging switch KC, the isolating switch KG and the second battery switch KB2 to close and controlling the second pre-charging circuit 12 to turn on to charge the second power source B2, and controlling the first battery switch KB1 and the first pre-charging circuit 11 to turn off to stop charging the first power source B1.

[0147] When only the second power supply B2 is detected to be undervoltage and the voltage of the first power supply B1 is normal, the rear-wheel drive working mode and the four-wheel drive working mode cannot be used. At this time, only the second power supply B2 needs to be charged. The charging control method is to control the charging switch KC, the isolation switch KG and the second battery switch KB2 to be closed and control the second pre-charging circuit 12 to be turned on, and control the first battery switch KB1 and the first pre-charging circuit 11 to be disconnected.

[0148] The second pre-charging circuit 12, the DC charging interface 10, the charging switch KC, the second power source B2, the isolating switch KG and the second battery switch KB2 form a second charging circuit; by connecting only the second charging circuit, only the second power source B2 is charged; therefore, the control strategy is simple and the cost is low. At the same time, by pre-charging the power source (charging current is limited) and then charging the power source normally, the power source is prevented from being damaged by high voltage shock.

[0149] According to some embodiments of the present application, there is also provided a Figure 6 The charging control method of the electric power system shown includes: controlling the charging switch KC, the isolating switch KG, the first battery switch KB1 and the second battery switch KB2 to close and controlling the first pre-charging circuit 11 and the second pre-charging circuit 12 to conduct to charge the first power supply B1 and the second power supply B2.

[0150] When it is detected that both the first power supply B1 and the second power supply B2 are undervoltage, all working modes (front-wheel drive working mode, rear-wheel drive working mode and four-wheel drive working mode) cannot be used. At this time, the first power supply B1 and the second power supply B2 need to be charged at the same time. The charging control method is to control the charging switch KC, the isolation switch KG, the first battery switch KB1 and the second battery switch KB2 to be closed and control the first pre-charging circuit 11 and the second pre-charging circuit 12 to be turned on.

[0151] It should be noted that controlling the pre-charging circuit to be turned on specifically includes: after closing the second switch K2 for a preset time, closing the first switch K1 and opening the second switch K2.

[0152] The control signal for controlling the above switches can be provided by a digital circuit.

[0153] The first pre-charging circuit 11, the DC charging interface 10, the charging switch KC, the first power supply B1 and the first battery switch KB1 constitute a first charging circuit, and the second pre-charging circuit 12, the DC charging interface 10, the charging switch KC, the second power supply B2, the isolation switch KG and the second battery switch KB2 constitute a second charging circuit; by connecting the first charging circuit and the second charging circuit, the first power supply B1 and the second power supply B2 are charged at the same time; therefore, the control strategy is simple and the cost is low. At the same time, by pre-charging the power supply (charging current is limited) and then charging the power supply normally, the power supply is prevented from being damaged by high voltage shock.

[0154] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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: It includes a first power source, a first battery switch, a second power source, a second battery switch and an isolating switch; The positive electrode of the first power supply, the first end of the first load and the first end of the isolation switch are connected to a first node, and the positive electrode of the second power supply, the first end of the second load and the second end of the isolation switch are connected to a second node; The positive electrode of the first power source is connected to the first end of the first battery switch, and the positive electrode of the second power source 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; The electric power system also includes a first AC charging circuit; The first terminal of the first AC charging circuit is connected to the first node; The second terminal of the first AC charging circuit is connected to the power ground; The first 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.

2. The electric power system according to claim 1, characterized in that: Also includes: a first pre-charging circuit, connected between the positive electrode of the first power source and the first node, configured to first limit and transfer the first battery current output by the first power source, and then transfer the first battery current; The second pre-charging circuit is connected between the positive electrode of the second power source and the second node, and is configured to first limit and transfer the second battery current output by the second power source, and then transfer the second battery current.

3. The electric power system according to claim 2, characterized in that: The first pre-charging circuit and the second pre-charging circuit both include a pre-charging module, and the pre-charging module 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 voltage input end of the pre-charging module, 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 voltage output end of the pre-charging module.

4. The electric power system according to claim 3, characterized in that: The first switch and the second switch each include a relay, and the current limiting resistor includes a thermistor.

5. The electric power system according to claim 1 or 2, characterized in that: It also includes a second AC charging circuit, a DC charging interface and a charging switch; The first end of the DC charging interface is connected to the first node, the second end of the DC charging interface is connected to the first end of the charging switch, and the first end of the second AC charging circuit is connected to the second node; The second end of the second AC charging circuit and the second end of the charging switch are commonly connected to a power ground; The second AC charging circuit is configured to convert the input AC power into a second DC power to charge the first power source and / or the second power source; The DC charging interface is configured to receive a third DC power and transfer the third DC power to charge the first power source and / or the second power source.

6. The electric power system according to claim 5, characterized in that: Also included is a third power source; The positive electrode of the third power source is connected to the third end of the first AC charging circuit and the third end of the second AC charging circuit; the negative electrode of the third power source is connected to the power ground; The first AC charging circuit is further configured to convert the input AC power into a third DC power to charge the third power source; The second AC charging circuit is further configured to convert the input AC power into a fourth DC power to charge the third power source.

7. The electric power system according to claim 1, characterized in that: The first battery switch and the second battery switch include relays; and the isolation switch includes a contactor.

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

9. A driving control method for an electric power system as claimed in claim 1, characterized in that: include: According to the driving instruction, the electric power system is controlled to work in a corresponding working mode, wherein the working mode includes: First working mode: controlling the first battery switch to close so that the first load works, and controlling the second battery switch and the isolation switch to open so that the second load stops working; The second working mode: controlling the second battery switch to close so that the second load works, and controlling the first battery switch and the isolation switch to open so that the first load stops working; The third working mode: controlling the first battery switch, the second battery switch and the isolation switch to be closed so that the first load and the second load work simultaneously.

10. The driving control method according to claim 9, characterized in that: Also includes: In the first working mode, when a failure of the first power supply is detected, the second battery switch is controlled to be closed to make the second load work, and the first battery switch and the isolation switch are controlled to be opened to stop the first load from working.

Images