Battery assembly, charging and discharging system, driving system, method, automobile and medium

Abstract

The invention discloses a battery assembly, a charging and discharging system, a driving system, a method, an automobile and a medium. The battery assembly comprises a first battery, a second battery and a switching circuit. The first battery and the second battery are used for connecting a charging interface or a power supply interface; the second end of the first battery is connected with the first end of the first battery; the switching circuit is arranged between the first battery and the second battery and is used for controlling connection or disconnection of a target battery, and the target battery is the first battery and / or the second battery. According to the battery assembly, the two batteries can be controlled to be connected in series between the circuits under the limiting working condition, so that the power utilization requirement is met, and the endurance mileage is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery assembly, a charging and discharging system, a driving system, a method, an automobile and a medium. BACKGROUND

[0002] In the existing power supply system of an electric vehicle, a single battery pack is generally used to supply power to the vehicle load and the motor, and the battery pack is charged through a direct current charging port and an alternating current charging port. In the electric vehicle using a single battery pack as a power source, the power demand can be met under general working conditions, but it is difficult to meet the power demand under extreme working conditions such as high-speed overtaking, zero-to-hundred acceleration, extreme escape, high-speed climbing, etc., which affects the endurance of the electric vehicle. SUMMARY

[0003] The embodiments of the present application provide a battery assembly, a charging and discharging system, a driving system, a method, an automobile and a medium to solve the problem that a single battery pack cannot meet the power demand under different working conditions.

[0004] A battery assembly includes a first battery, a second battery and a switch circuit.

[0005] The first battery and the second battery are used to connect a charging interface or a power supply interface; the second end of the first battery is connected to the first end of the first battery.

[0006] The switch circuit is arranged between the first battery and the second battery and is used to control the connection or disconnection of a target battery, and the target battery is the first battery and / or the second battery.

[0007] A charging and discharging system includes the charging interface described above for connecting a charging power supply 5.

[0008] The power supply interface is used to connect a load.

[0009] A charging and discharging control method is applicable in the charging and discharging system described above, and includes:

[0010] Based on a target working condition, the on-off of the switch circuit is controlled to realize the connection of a target battery, and the target battery is charged and discharged; the target battery is the first battery and / or the second battery.

[0011] A self-heating method is applicable in the charging and discharging system described above, and includes:

[0012] Current battery data corresponding to two batteries is obtained;

[0013] Based on the current battery data corresponding to the two batteries, a battery to be heated is determined, the on-off of the switch circuit is controlled to make a self-heating circuit corresponding to the battery to be heated conductive, and the battery to be heated is self-heated.

[0014] A driving system comprising the battery assembly and a driving module;

[0015] The driving module is connected with the power supply interface and is configured to connect the motor.

[0016] A driving control method, which is applicable to the driving system, comprises the following steps:

[0017] When the vehicle is in a driving mode, obtaining a current mode of the vehicle;

[0018] Based on the current mode of the vehicle, controlling the on-off of the switch circuit to realize the connection of a target battery, and controlling the driving module to drive the motor to work.

[0019] The target battery is the first battery and / or the second battery.

[0020] A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the charging and discharging control method, the self-heating method, or the driving control method when executing the computer program.

[0021] An automobile comprising the charging and discharging system, the driving system, and the motor.

[0022] A computer-readable storage medium storing a computer program, wherein the computer program is executable by a processor to implement the charging and discharging control method, the self-heating method, or the driving control method.

[0023] The battery assembly, the charging and discharging system, the driving system, the method, the automobile, and the medium can connect at least one of the first battery and the second battery arranged in series through the switch circuit to the charging interface or the power supply interface, so that the charging power source can charge the at least one battery through the charging interface, or the at least one battery can supply power to the load or the motor connected with the driving module through the power supply interface, to meet different requirements. In addition, the electric quantity of the two batteries is generally different, that is, the requirements of small size and low cost can be met, and power supply can be supplemented when the required power is insufficient. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1is a circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0026] Figure 2 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0027] Figure 3 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0028] Figure 4 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0029] Figure 5 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0030] Figure 6 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0031] Figure 7 is another circuit schematic diagram of a battery assembly in an embodiment of the present application;

[0032] Figure 8 is another circuit schematic diagram of a battery assembly in an embodiment of the present application.

[0033] In the figure: 1, first battery; 2, second battery; 3, switching circuit; 4, bidirectional voltage conversion circuit; 5, charging power supply; 51, alternating current power supply; 52, direct current power supply; 6, load; 7, driving module; 8, motor. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments presented herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity throughout the drawings the same reference numbers represent the same elements.

[0036] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0037] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] For a thorough understanding of the present application, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

[0040] Embodiments of the present application provide a battery assembly, such asFigure 1 As shown, the battery assembly comprises a first battery 1, a second battery 2 and a switch circuit 3; the first battery 1 and the second battery 2 are used to connect a charging interface or a power supply interface; the second end of the first battery 1 is connected to the first end of the first battery 1; the switch circuit 3 is arranged between the first battery 1 and the second battery 2, and is used to control the connection or disconnection of the target battery, which is the first battery 1 and / or the second battery 2.

[0041] Among them, the first battery 1 and the second battery 2 are two batteries of the battery assembly, and the first ends of the two batteries are positive and negative to each other. The charging interface is an interface for connecting a charging power supply, generally including a positive charging interface and a negative charging interface, which needs to be connected to both ends of at least one battery. The power supply interface is an interface for connecting an electrical device, generally including a positive power supply interface and a negative power supply interface, which needs to be connected to both ends of at least one battery. The target battery is a battery for connecting to a circuit and connecting to the charging interface or the power supply interface.

[0042] As an example, the first battery 1 and the second battery 2 are connected in series, that is, the second end of the first battery 1 is connected to the first end of the first battery 1, and specifically, the first battery 1 and the second battery 2 are connected in series, that is, the positive electrode of any battery is connected to the negative electrode of another battery. For example, the negative electrode of the first battery 1 can be connected to the positive electrode of the second battery 2, at this time, the positive electrode of the first battery 1 and the negative electrode of the second battery 2 are used to connect the charging interface or the power supply interface. Alternatively, the positive electrode of the first battery 1 can also be connected to the negative electrode of the second battery 2, at this time, the negative electrode of the first battery 1 and the positive electrode of the second battery 2 are used to connect the charging interface or the power supply interface.

[0043] As an example, the battery assembly is also provided with a switch circuit 3, which can connect both ends of the first battery 1 to the charging interface or the power supply interface, so as to separately control the first battery 1 to connect the charging power supply to receive the charging of the charging power supply, or separately control the first battery 1 to connect the power supply interface to supply power to the electrical device, for example, to supply power to the load 6 or the driving module 7; or connect both ends of the second battery 2 to the charging interface or the power supply interface, so as to separately control the second battery 2 to connect the charging power supply to receive the charging of the charging power supply, or separately control the first battery 1 to connect the power supply interface to supply power to the electrical device, for example, to supply power to the load 6 or the driving module 7; or control both ends of the first battery 1 and the second battery 2 connected in series (i.e. the first end of the first battery 1 and the second end of the second battery 2) to be connected to the charging interface or the power supply interface to receive the charging of the charging power supply, or separately control the first battery 1 to be connected to the power supply interface to supply power to the electrical device, for example, to supply power to the load 6 or the driving module 7.

[0044] In this embodiment, at least one of the first battery 1 and the second battery 2 connected in series can be connected to the charging interface or the power supply interface through the switching circuit 3, so that the charging power supply can charge at least one battery through the charging interface, or at least one battery can supply power to the load 6 or the motor 8 connected with the driving module 7 through the power supply interface, to meet different needs. In addition, the power of the two batteries is generally different, that is, the requirements of small size and low cost can be met, and power supplement can be performed when the required power is insufficient.

[0045] For example, when the power supply interface is connected with the motor 8 through the driving module 7, one of the batteries is controlled to be connected to the circuit, and in the case of high power demand, for example, in the case of high-speed overtaking, zero-hundred acceleration, limit escape, high-speed climbing and other limit working conditions, the two batteries are controlled to be connected in series between the power supply interfaces, so as to improve the endurance mileage and meet the specific needs of different working conditions.

[0046] In an embodiment, as shown in Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 , the battery assembly further includes a bidirectional voltage conversion circuit 4; the first end and the second end of the bidirectional voltage conversion circuit 4 are used to connect the charging interface or the power supply interface; the third end and the second end of the bidirectional voltage conversion circuit 4 are respectively connected with the two ends of the first battery 1, the two ends of the second battery 2, or the first end of the first battery 1 and the second end of the second battery 2.

[0047] The bidirectional voltage conversion circuit 4 is a circuit that can realize both step-up conversion and step-down conversion control. Generally, the bidirectional voltage conversion circuit 4 includes a plurality of switching tubes, which can control the connection of the first battery 1 and / or the second battery 2 with the charging interface or the power supply interface, and can realize the voltage conversion function in combination with specific electronic devices.

[0048] As an example, the bidirectional voltage conversion circuit 4 includes three connection ends, the polarities of the first end and the second end of the bidirectional voltage conversion circuit 4 are connected, and they are positive and negative; the polarities of the third end and the second end of the bidirectional voltage conversion circuit 4 are opposite, and they are positive and negative. For example, the first end of the bidirectional voltage conversion circuit 4 is a positive connection end, the second end is a negative connection end, and the third end is a positive connection end.

[0049] As an example, the first end and the second end of the bidirectional voltage conversion circuit 4 are used to connect the charging interface or the power supply interface, and the third end and the second end of the bidirectional voltage conversion circuit 4 are respectively connected with the two ends of the first battery 1, to control the connection of the first battery 1 with the charging interface or the power supply interface, and to realize voltage conversion.

[0050] As another example, the first end and the second end of the bidirectional voltage conversion circuit 4 are used to connect the charging interface or the power supply interface, and the third end and the second end of the bidirectional voltage conversion circuit 4 are connected to the two ends of the second battery 2 respectively, so as to control the second battery 2 to connect the charging interface or the power supply interface, and voltage conversion can be realized.

[0051] As another example, the first end and the second end of the bidirectional voltage conversion circuit 4 are used to connect the charging interface or the power supply interface, and the third end and the second end of the bidirectional voltage conversion circuit 4 are connected to the two ends of the second battery 2 respectively, so as to control the second battery 2 to connect the charging interface or the power supply interface, and voltage conversion can be realized.

[0052] In an embodiment, as shown in Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 , the bidirectional voltage conversion circuit 4 comprises at least one voltage conversion unit, each voltage conversion unit comprising a first bridge arm and a first inductor L1; the first ends of the at least one first bridge arm are connected in parallel to form the first end of the bidirectional voltage conversion circuit 4; the second ends of the at least one first bridge arm are connected in parallel to form the second end of the bidirectional voltage conversion circuit 4; the first end of each first inductor L1 is connected to the midpoint of a first bridge arm, and the second ends of the at least one first inductor L1 are connected in parallel to form the third end of the bidirectional voltage conversion circuit 4.

[0053] As an example, the bidirectional voltage conversion circuit 4 comprises at least one voltage conversion unit, each voltage conversion unit comprising a first bridge arm and a first inductor L1. The first bridge arm comprises a first power tube T1 and a first power tube T2 arranged in series, and the connection node between the first power tube T1 and the first power tube T2 is the midpoint of the first bridge arm. Among the first power tube T1 and the first power tube T2, the power tube used to connect the positive electrode of the battery, the positive electrode charging interface and the positive electrode power supply interface is the upper bridge power tube, and the power tube used to connect the negative electrode of the battery, the negative electrode charging interface and the negative electrode power supply interface is the lower bridge power tube.

[0054] In this example, the bidirectional voltage conversion circuit 4 comprises at least one first bridge arm, and the first end and the second end of the at least one first bridge arm are the two ends of the first power tube T1 and the first power tube T2 arranged in series. In this example, the first end of the at least one first bridge arm is connected in parallel to form the first end of the bidirectional voltage conversion circuit 4, and the second end of the at least one first bridge arm is connected in parallel to form the second end of the bidirectional voltage conversion circuit 4. The first end and the second end of the bidirectional voltage conversion circuit 4 are used to connect the charging interface or the power supply interface. Understandably, the two ends of the at least one first bridge arm are connected to the positive electrode charging interface and the negative electrode charging interface respectively, and the two ends of the at least one first bridge arm are connected to the positive electrode power supply interface or the negative electrode power supply interface respectively.

[0055] In the example, the bidirectional voltage conversion circuit 4 further comprises at least one first inductor L1, a first end of each first inductor L1 being connected to the midpoint of a first bridge arm, and the second ends of the at least one first inductor L1 being connected in parallel to form a third end of the bidirectional voltage conversion circuit 4, the third end of the bidirectional voltage conversion circuit 4 being opposite in polarity to the second end, so that the bidirectional voltage conversion circuit 4 can be connected across the at least one battery, i.e. across the first battery 1, across the second battery 2, or across the first end of the first battery 1 and the second end of the second battery 2, thereby controlling the at least one battery to be connected to the charging interface or the power supply interface, and realizing voltage conversion.

[0056] In an embodiment, as shown in Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 , the second end of the bidirectional voltage conversion circuit 4 is connected to the first end of the first battery 1 and / or the second end of the second battery 2; and the third end of the bidirectional voltage conversion circuit 4 is connected to the battery connection node, which is the second end of the first battery 1 and the first end of the second battery 2.

[0057] As an example, when the second end of the bidirectional voltage conversion circuit 4 is connected to the first end of the first battery 1, and the third end of the bidirectional voltage conversion circuit 4 is connected to the battery connection node, the first battery 1 can be controlled to be connected to the charging interface or the power supply interface; when the second end of the bidirectional voltage conversion circuit 4 is connected to the second end of the second battery 2, and the third end of the bidirectional voltage conversion circuit 4 is connected to the battery connection node, the second battery 2 can be controlled to be connected to the charging interface or the power supply interface; or the second end of the bidirectional voltage conversion circuit 4 can be connected to the first end of the first battery 1 and the second end of the second battery 2, and the third end of the bidirectional voltage conversion circuit 4 can be connected to the battery connection node, so that the at least one battery can be controlled to be connected to the charging interface or the power supply interface by controlling the on-off of the first power transistor T1 and the second power transistor T2, and the circuit structure is simple.

[0058] In an embodiment, as shown in Figure 2 , the switching circuit 3 further comprises a first switch K1 and / or a second switch K2; the first switch K1 is arranged between the second end of the bidirectional voltage conversion circuit 4 and the first end of the first battery 1; and / or, the second switch K2 is arranged between the second end of the bidirectional voltage conversion circuit 4 and the second end of the second battery 2.

[0059] As an example, the switch circuit 3 not only includes the bidirectional voltage conversion circuit 4, but also includes the first switch K1 and the second switch K2. The first switch K1 is arranged between the second end of the bidirectional voltage conversion circuit 4 and the first end of the first battery 1, and / or the second switch K2 is arranged between the second end of the bidirectional voltage conversion circuit 4 and the second end of the second battery 2. When any one of the first switch K1 and the second switch K2 is turned on, the battery corresponding to the turned-on switch can be connected to the circuit through the bidirectional voltage conversion circuit 4 to receive charging or supply power to the outside, so that the bidirectional voltage conversion circuit 4 can convert the input voltage or the output voltage of the battery to meet the actual demand and ensure the normal work of the battery assembly. When the first switch K1 and the second switch K2 are turned on at the same time, the power tube in the bidirectional voltage conversion circuit 4 is turned off to avoid short circuit of the charging interface or the power supply interface, and the first battery 1 and the second battery 2 can be connected in series to the circuit.

[0060] In an embodiment, as shown in FIG. 3, the switch circuit 3 further includes a third switch K3. Figure 3 The third switch K3 is arranged between the third end of the bidirectional voltage conversion circuit 4 and the battery connection node.

[0061] As an example, the switch circuit 3 not only includes the bidirectional voltage conversion circuit 4, the first switch K1 and / or the second switch K2, but also further includes the third switch K3 arranged between the third end of the bidirectional voltage conversion circuit 4 and the battery connection node. When the first switch K1 and the third switch K3 are turned on, the first battery 1 corresponding to the two switches is connected to the circuit. When the second switch K2 and the third switch K3 are turned on, the second battery 2 corresponding to the two switches is connected to the circuit. When the first switch K1 and the second switch K2 are turned on and the third switch K3 is turned off, only the first battery 1 and the second battery 2 are connected to the circuit, and the bidirectional voltage conversion circuit 4 is not connected to the circuit, so that the voltage conversion process is not needed. In addition, when the first switch K1 and the second switch K2 are turned on at the same time, the third switch K3 and the power tube of the bidirectional voltage conversion circuit 4 are turned off to avoid short circuit of the circuit, and the first battery 1 and the second battery 2 can be connected in series to the circuit to meet the demand of large power use and improve the cruising range.

[0062] In an embodiment, as shown in FIG. 3, the switch circuit 3 further includes a seventh switch K7. Figure 8 The seventh switch K7 is arranged between the third end of the bidirectional voltage conversion circuit 4 and the first end of the bidirectional voltage conversion circuit 4.

[0063] As an example, in addition to the bidirectional voltage conversion circuit 4, the switching circuit 3 may also include a seventh switch K7. The seventh switch K7 is disposed between the third terminal and the first terminal of the bidirectional voltage conversion circuit 4. By controlling the opening and closing of the seventh switch K7, the two ends of the target battery can be controlled to be connected to the charging interface or the power supply interface through the bidirectional voltage conversion battery 4, or connected to the charging interface or the power supply interface without the bidirectional voltage conversion circuit.

[0064] like Figure 8 As shown, when the first switch K1 and the fifth switch K5 are turned on, the first battery 1 is connected to the circuit. If the seventh switch K7 is turned on, the first battery 1 can be directly connected to the charging interface or the power supply interface to form a direct charging circuit or a direct discharging circuit. If the seventh switch K7 is turned off, the first battery 1 can be connected to the charging interface or the power supply interface through the bidirectional voltage conversion circuit 4. At this time, the bidirectional voltage conversion circuit 4 can perform voltage conversion and can control the on and off of different switches and power transistors according to different situations to achieve boost conversion or buck conversion.

[0065] In one embodiment, such as Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, the battery assembly also includes a first capacitor C1; the two ends of the first capacitor C1 are connected to the third end of the bidirectional voltage conversion circuit 4 and the second end of the bidirectional voltage conversion circuit 4, respectively.

[0066] As an example, the battery assembly also includes a first capacitor C1. The two ends of the first capacitor C1 are connected to the third end and the second end of the bidirectional voltage conversion circuit 4, respectively. Specifically, the first end of the first capacitor C1 can be placed between the third end of the bidirectional voltage conversion circuit 4 and the battery connection node; and the second end of the first capacitor C1 can be placed between the second end of the bidirectional voltage conversion circuit 4 and the first end of the first battery 1, and / or between the second end of the bidirectional voltage conversion circuit 4 and the second end of the second battery 2. This allows the first capacitor C1 to cooperate with the first inductor L1 in the bidirectional voltage conversion circuit 4 to form an LC filter circuit when the first battery 1 and / or the second battery 2 are connected to the circuit. By reusing the first inductor L1, energy storage and filtering effects can be achieved, and the number of components in the battery assembly can be effectively reduced, which helps to save circuit costs.

[0067] In one embodiment, such as Figures 1-8 As shown, the battery assembly also includes a second capacitor C2; the two ends of the second capacitor C2 are connected to the first and second ends of the bidirectional voltage conversion circuit 4, respectively.

[0068] The two ends of the second capacitor C2 are connected to the first end and the second end of the bidirectional voltage conversion circuit 4 respectively, so that the battery connected to the circuit can be self-heated by the bidirectional voltage conversion circuit 4.

[0069] As an example, when at least one of the first battery 1 and the second battery 2 is determined as a target battery, the target battery is connected to the third end and the second end of the bidirectional voltage conversion circuit 4 through the switch circuit 3, and the third end and the second end of the bidirectional voltage conversion circuit 4 are connected to the two ends of the second capacitor C2 respectively, forming a self-heating loop corresponding to the target battery. When the self-heating loop is turned on, the battery in the self-heating loop is self-heated.

[0070] For example, when the target battery is the first battery 1, the self-heating process of the first battery 1 is as follows: first, control the first battery 1 to be connected to the circuit, and then control the lower bridge power tube T2 in the bidirectional voltage conversion circuit 4 to be turned on and the upper bridge power tube T1 to be turned off, so that the first battery 1 charges the first inductor L1 and charges the second capacitor C2 through the diode connected in parallel with the upper bridge power tube T1; then, control the lower bridge power tube T2 to be turned off and the upper bridge power tube T1 to be turned on, and use the second capacitor C2 and the first inductor L1 to charge the first battery 1, so as to complete the self-heating process of the target battery.

[0071] For another example, when the target battery includes the first battery 1 and the second battery 2 connected in series, the self-heating process of the target battery is as follows: first, control the switch circuit 3 to be turned on, so that the first battery 1 and the second battery 2 are connected in series to the circuit; then, control the lower bridge power tube T2 in the bidirectional voltage conversion circuit 4 to be turned on and the upper bridge power tube T1 to be turned off, so that the first battery 1 charges the first inductor L1 and charges the second capacitor C2 and the second battery 2 through the diode connected in parallel with the upper bridge power tube T1; then, control the lower bridge power tube T2 to be turned off and the upper bridge power tube T1 to be turned on, and use the second capacitor C2 and the second battery 2 to charge the first battery 1, so as to complete the self-heating process of the target battery.

[0072] In an embodiment, the two ends of the second capacitor C2 are also connected to the two ends of the target battery, and the target battery is the first battery 1 and / or the second battery 2; the battery assembly further includes a pre-charging circuit arranged between the target battery and the second capacitor C2.

[0073] As an example, the battery assembly further comprises a pre-charge circuit, which is arranged between the target battery and the second capacitor C2. For example, a first pre-charge circuit can be included, which is arranged between the first battery 1 and the second capacitor C2, and specifically includes a first pre-charge resistor R01 and a first pre-charge switch K01 arranged in series, and is used to be turned on when the first battery 1 is pre-charged, so as to avoid large current generated in the charging moment from damaging the battery. Alternatively, a second pre-charge circuit can be included, which is arranged between the second battery 2 and the second capacitor C2, and specifically includes a second pre-charge resistor R02 and a second pre-charge switch K02 arranged in series, and is used to be turned on when the second battery 2 is pre-charged, so as to avoid large current generated in the charging moment from damaging the battery.

[0074] Generally, the battery assembly further comprises a passive discharge resistor R1 arranged in parallel with the second capacitor C2, and after the vehicle is powered off, the switch circuit 3 needs to be controlled to be disconnected, at this time, the second capacitor C2 needs to be discharged, therefore, the discharge process needs to be completed by the passive discharge resistor R1 in cooperation with the second capacitor C2.

[0075] In an embodiment, as shown in Figure 4 The switch circuit 3 includes a first switch K1, a second switch K2 and a fourth switch K4; a first end of the first switch K1 is connected to a first end of the first battery 1, and a second end of the first switch K1 is used to connect a charging interface or a power supply interface; a first end of the second switch K2 is connected to a second end of the second battery 2, and a second end of the second switch K2 is used to connect the charging interface or the power supply interface; the fourth switch K4 is arranged between the second end of the first battery 1 and the first end of the second battery 2.

[0076] As an example, the switch circuit 3 can include a first switch K1, a second switch K2 and a fourth switch K4, the first switch K1 is arranged between the first end of the first battery 1 and the charging interface or the power supply interface, the second switch K2 is arranged between the second end of the second battery 2 and the charging interface or the power supply interface, and the fourth switch K4 is arranged between the second end of the first battery 1 and the first end of the second battery 2; when the first switch K1 is turned on and the fourth switch K4 is disconnected, the first battery 1 between the first switch K1 and the fourth switch K4 can be connected to the circuit; when the second switch K2 is turned on and the fourth switch K4 is disconnected, the second battery 2 between the second switch K2 and the fourth switch K4 can be connected to the circuit, so as to realize the selective control of one of the two batteries connected to the circuit, so as to realize the charging or external power supply.

[0077] As shown in Figure 5As shown, when the switching circuit 3 further comprises the bidirectional voltage conversion circuit 4, the third end of the bidirectional voltage conversion circuit 4 can be connected to the connection node between the second end of the first battery 1 and the fourth switch K4, or the connection node between the first end of the second battery 2 and the fourth switch K4, and the bidirectional voltage conversion circuit 4 is used to convert the voltage of the battery connected to the third end and the second end thereof, so as to guarantee the realization of the charging and discharging function, or realize other functions, for example, a self-heating function.

[0078] In an embodiment, the switching circuit 3 further comprises a fifth switch K5 and a sixth switch K6; the first end of the fifth switch K5 is arranged between the second end of the first battery 1 and the fourth switch K4, and the second end of the fifth switch K5 is used to connect the charging interface or the power supply interface; the first end of the sixth switch K6 is arranged between the first end of the second battery 2 and the fourth switch K4, and the second end of the sixth switch K6 is used to connect the charging interface or the power supply interface.

[0079] As an example, the switching circuit 3 can comprise the fourth switch K4 and the fifth switch K5 in addition to the first switch K1, the second switch K2 and the fourth switch K4. The first end of the fourth switch K4 is arranged between the second end of the first battery 1 and the fourth switch K4, and the second end thereof is used to connect the charging interface or the power supply interface; and the first end of the sixth switch K6 is arranged between the first end of the second battery 2 and the fourth switch K4, and the second end thereof is used to connect the charging interface or the power supply interface. When the fourth switch K4 is turned off, the two switches controlling the two ends of any battery are turned on, so that the battery is connected to the circuit alone; when the fourth switch K4 is turned on and the fifth switch K5 and the sixth switch K6 are turned off, the two batteries are connected in series to the circuit, so as to realize the connection of at least one battery to the two bus bars to meet different requirements.

[0080] In an embodiment, the first battery 1 has a larger capacity than the second battery 2, or the first battery 1 has a smaller peak discharge rate than the second battery 2.

[0081] As an example, the first battery 1 is a battery with large capacity or small peak discharge rate, for example, the first battery 1 is an EV battery, which can meet the normal driving demand of the whole vehicle in the pure EV working condition. The second battery 2 is a battery with small capacity or large peak discharge rate, for example, the second battery 2 is an HEV battery, which can meet the peak power demand of the whole vehicle in the special working condition such as starting, sudden acceleration and overtaking. Generally, if two batteries with the same capacity are used in the battery assembly, the overall volume is large, the installation space is not enough and the cost is high; but if only one battery is used, there will be a situation of insufficient power in the special working condition, therefore, in the two batteries, the capacity of one battery is large and the peak discharge rate is small, and the capacity of the other battery is small and the peak discharge rate is large, which can not only meet the requirements of small volume and low cost, but also supplement the power when the demand power is insufficient.

[0082] As an example, the capacity of the first battery 1 is 2-100 times of the capacity of the second battery 2, or the peak discharge rate of the second battery 2 is 2-50 times of the peak discharge rate of the first battery 1.

[0083] As an example, the capacity of the first battery 1 is 2-100 times of the capacity of the second battery 2, and the peak discharge rate of the first battery 1 is smaller than the peak discharge rate of the second battery 2, so as to ensure that the first battery 1 can effectively meet the normal driving demand of the whole vehicle in the pure EV working condition.

[0084] As another example, the capacity of the first battery 1 is larger than the capacity of the second battery 2, and the peak discharge rate of the second battery 2 is 2-50 times of the peak discharge rate of the first battery 1, which can ensure that the second battery 2 can effectively meet the peak power demand of the whole vehicle in the special working condition such as starting, sudden acceleration and overtaking.

[0085] As another example, the capacity of the first battery 1 is 2-100 times of the capacity of the second battery 2, and the peak discharge rate of the second battery 2 is 2-50 times of the peak discharge rate of the first battery 1, so that the first battery 1 can meet the normal driving demand of the whole vehicle in the pure EV working condition, and the second battery 2 can effectively meet the peak power demand of the whole vehicle in the special working condition such as starting, sudden acceleration and overtaking, and in these cases, the voltage adjustment is performed through the bidirectional voltage conversion circuit 4, and the power of the first battery 1 is supplemented by the second battery 2, so that it can meet different working conditions.

[0086] The embodiment of the present application provides a charging and discharging system, which comprises the battery assembly, the charging interface and the power supply interface in the above embodiment; the charging interface is used for connecting the charging power supply 5; and the power supply interface is used for connecting the load 6.

[0087] The charging interface is an interface for connecting a charging power supply. The load 6 is a load 6 for connecting a load 6 that needs to use electricity, which is other loads 6 on the vehicle except the motor 8 that needs to be connected through the driving module 7, including but not limited to vehicle-mounted instruments and air conditioner compressors, etc. The driving module 7 is a module for driving the motor 8 to work.

[0088] In the embodiment, the charging and discharging system includes a battery assembly, at least one of the first battery 1 and the second battery 2 can be connected to the circuit through the switching circuit 3, so that it can be connected to the charging power supply through the charging interface, and the at least one battery is charged, and the load 6 is powered. A bidirectional voltage conversion circuit 4 is also provided between the two bus bars, which can perform both step-up conversion and step-down conversion to convert the input voltage and output voltage of the battery connected to the two bus bars to meet the power supply demand or charging demand.

[0089] In an embodiment, the charging interface includes at least one of an alternating current charging interface and a direct current charging interface, the alternating current charging interface is used to connect an alternating current power supply 51, and the direct current charging interface is used to connect a direct current power supply 52.

[0090] The alternating current charging interface is an interface for connecting an alternating current power supply 51. The direct current charging interface is an interface for connecting a direct current power supply 52 (including but not limited to a direct current charging pile). The load 6 is a load 6 for connecting a load 6 that needs to use electricity, which is other loads 6 on the vehicle except the motor 8 that needs to be connected through the driving module 7

[0091] The embodiment of the application provides a charging and discharging control method, which is suitable for the charging and discharging system described above, and includes: based on a target working condition, controlling the on-off of the switching circuit 3 to realize the connection of a target battery, and controlling the target battery to charge and discharge; the target battery is the first battery 1 and / or the second battery 2.

[0092] As an example, the controller can receive first vehicle data, determine the target working condition based on the first vehicle data. In this example, when the first vehicle data is the vehicle running state, the target working condition thereof can be determined as the discharging working condition. When the first vehicle data is connected to the charging power supply, the target working condition thereof is determined as the charging working condition, for example, when the first vehicle data is a direct current power supply 52 such as a direct current charging gun, the target working condition thereof can be determined as the direct current charging working condition; when the first vehicle data is an alternating current power supply 51 such as a vehicle-mounted power supply to charge the battery, the target working condition thereof can be determined as the alternating current charging working condition. The first vehicle data is data collected at the current time for determining the working condition of the vehicle.

[0093] As an example, after determining the target working condition, the controller can control the on-off of the switch circuit 3 based on the target working condition to determine the first battery 1 and / or the second battery 2 as the target battery, and turn on the charging and discharging circuit corresponding to the target battery to make the target battery charge and discharge. For example, when the target working condition is the discharging working condition, the discharging circuit corresponding to the target battery can be turned on; when the target working condition is the charging working condition, the charging circuit corresponding to the target battery can be turned on.

[0094] Since the battery assembly of the charging and discharging system, at least one of the first battery 1 and the second battery 2 arranged in series can be connected to the charging interface or the power supply interface through the switch circuit 3, so that at least one battery can be charged through the charging interface, or the load 6 or the motor 8 can be powered through the power supply interface. When the power demand is low, one of the batteries can be controlled to access the circuit, and when the power demand is high, two batteries can be controlled to access the circuit to improve the endurance mileage and meet the specific needs of different working conditions. Moreover, the power of the two batteries is generally different, that is, the requirements of small size and low cost can be met, and power supplement can be performed when the demand power is insufficient.

[0095] In an embodiment, based on the target working condition, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery and control the target battery to charge and discharge, including: when the target working condition is the discharging working condition, the on-off of the switch circuit 3 is controlled to turn on the discharging circuit corresponding to the target battery to power the load 6.

[0096] As an example, when the target working condition is the discharging working condition, the controller can control the on-off of the switch circuit 3 according to the actual situation to turn on the discharging circuit corresponding to the target battery to power the load 6. The target battery can be the first battery 1, the second battery 2, or the first battery 1 and the second battery 2 arranged in series. The discharging circuit can be the direct connection discharging circuit or the step-up discharging circuit in the above embodiments, which is determined according to the output voltage of the target battery and the demand power supply voltage. The direct connection discharging circuit refers to a circuit in which the battery can directly power the load 6 or the motor 8 without voltage conversion. The step-up discharging circuit refers to a circuit in which the battery needs to be stepped up during the process of powering the load 6 or the motor 8.

[0097] In an embodiment, when the target working condition is the discharging working condition, the on-off of the switch circuit 3 is controlled to turn on the discharging circuit corresponding to the target battery to power the load 6, including:

[0098] S11: When the target working condition is the discharging working condition, the demand power supply voltage of the load 6 is obtained.

[0099] S12: If the output voltage of the target battery is greater than the required supply voltage, the battery with the output voltage greater than the required supply voltage is determined as the target battery, and the on-off of the switch circuit 3 is controlled to make the direct discharge circuit corresponding to the target battery conductive, so as to supply power to the load 6 by using the output voltage of the target battery;

[0100] S13: If the output voltage of the target battery is not greater than the required supply voltage, the battery connected with the bidirectional voltage conversion circuit 4 is determined as the target battery, and the on-off of the switch circuit 3 is controlled to make the boost discharge circuit corresponding to the target battery conductive, so as to supply power to the load 6 by using the output voltage of the target battery after boost conversion.

[0101] As an example, in step S11, the controller needs to obtain the required supply voltage of the load 6 when the target working condition is the discharge working condition, and compare the required supply voltage with the output voltage of the first battery 1 and the output voltage of the second battery 2.

[0102] As an example, in step S12, the controller determines that the first battery 1 and / or the second battery 2 can provide the required supply voltage meeting the normal working of the load 6 when the output voltage of the target battery is greater than the required supply voltage, i.e. the output voltage of the first battery 1 is greater than the required supply voltage, or the output voltage of the second battery 2 is greater than the required supply voltage, or the output voltage of the series connection of the first battery 1 and the second battery 2 is greater than the required supply voltage, and then the battery with the output voltage greater than the required supply voltage is determined as the target battery, for example, the first battery 1 is determined as the target battery when the output voltage of the first battery 1 is greater than the required supply voltage of the load 6, the on-off of the switch circuit 3 is controlled to make the direct discharge circuit corresponding to the target battery conductive, and power is supplied to the load 6 by using the output voltage of the target battery, and the control process is simple. The direct discharge circuit here refers to a circuit in which the two ends of the battery are directly connected with the load 6, and the output voltage of the battery can directly supply power to the load 6.

[0103] As an example, in step S13, the controller determines that the first battery 1 and / or the second battery 2 cannot provide the required supply voltage meeting the normal working of the load 6 when the output voltage of the target battery is not greater than the required supply voltage, and then the battery connected with the bidirectional voltage conversion circuit 4 is determined as the target battery, the on-off of the switch circuit 3 is controlled to make the boost discharge circuit corresponding to the target battery conductive, the output voltage of the target battery is boosted and converted, and power is supplied to the load 6 by using the voltage after boost conversion, which helps to ensure the normal working of the load 6. The boost discharge circuit here refers to a circuit in which the two ends of the battery are connected with the load 6 through the bidirectional voltage conversion circuit 4, specifically, the two ends of the battery are connected with the third end and the second end of the bidirectional voltage conversion circuit 4 respectively, the first end and the second end of the bidirectional voltage conversion circuit 4 are connected with the load 6, and boost conversion is performed by using the bidirectional voltage conversion circuit 4.

[0104] In an embodiment, the control switch circuit 3 is controlled to be on or off based on the target working condition to realize the connection of the target battery and control the target battery to charge or discharge, including:

[0105] S21: If the target working condition is a direct current charging condition, the control switch circuit 3 is controlled to be on or off to make the direct current charging loop corresponding to the target battery conductive, so that the direct current power supply 52 charges the target battery;

[0106] S22: If the target working condition is an alternating current charging condition, the control switch circuit 3 is controlled to be on or off to make the alternating current charging loop corresponding to the target battery conductive, so that the alternating current power supply 51 charges the target battery.

[0107] As an example, in step S21, when the target working condition is a direct current charging condition, the control switch circuit 3 is controlled to be on or off to make the direct current charging loop corresponding to the target battery conductive, so that the target element in the direct current charging loop works to make the direct current power supply 52 charge the target battery. The direct current charging loop can be any one of a direct connection direct current charging loop, a boost direct current charging loop and a buck direct current charging loop according to the specific circuit design; when any two direct current charging loops are provided in the same battery, the first battery 1 and / or the second battery 2 can be determined as the target battery according to the comparison result of the power supply voltage of the direct current charging interface 52 and the required charging voltage of the battery, and the direct current charging loop corresponding to the target battery is controlled to be conductive to make the direct current power supply 52 charge the target battery.

[0108] As an example, in step S22, when the target working condition is an alternating current charging condition, the control switch circuit 3 is controlled to be on or off to make the alternating current charging loop corresponding to the target battery conductive, so that the alternating current power supply 51 charges the target battery. Since the alternating current power supply 51 is generally a vehicle-mounted power supply on the automobile, the two ends thereof are directly connected with the load 6, so that the alternating current charging loop between the alternating current power supply 51 and the load 6 can be directly controlled to be conductive, for example, the vehicle-mounted power supply can charge the target battery in alternating current.

[0109] In an embodiment, step S21, i.e., if the target working condition is a direct current charging condition, the control switch circuit 3 is controlled to be on or off to make the direct current charging loop corresponding to the target battery conductive, so that the direct current power supply 52 charges the target battery, including:

[0110] S211: When the target working condition is a direct current charging condition, the power supply voltage range of the direct current power supply 52 and the required charging voltage of the target battery are obtained;

[0111] S212: If the required charging voltage is within the power supply voltage range, the control switch circuit 3 is controlled to be on or off to make the direct connection direct current charging loop corresponding to the target battery conductive;

[0112] S213: If the required charging voltage is greater than the supply voltage range, the on-off of the switch circuit 3 is controlled to make the boost DC charging loop corresponding to the target battery conductive;

[0113] S214: If the required charging voltage is less than the supply voltage range, the on-off of the switch circuit 3 is controlled to make the boost DC charging loop corresponding to the target battery conductive.

[0114] The supply voltage range refers to the range formed by the lower limit value and the upper limit value of the supply voltage that the DC power supply 52 can provide, which is the voltage range that the DC power supply 52 can provide. The required charging voltage refers to the charging voltage required by the target battery.

[0115] As an example, in step S211, when the target working condition is a DC charging working condition, that is, when the DC power supply 52 (such as a charging gun) is inserted into the car and its charge-discharge system is connected to the charging pile insertion signal, the controller can interact with the charging pile to determine the supply voltage range of the DC power supply 52, and compare the supply voltage range with the required charging voltage of the target battery to determine the charging strategy.

[0116] As an example, in step S212, when the required charging voltage of the target battery is within the supply voltage range corresponding to the DC power supply 52, it is determined that the DC power supply 52 can provide the target battery with a voltage that meets its requirements, and at this time, the direct connection DC charging loop corresponding to the target battery can be controlled to be conductive to achieve direct connection DC charging of the target battery. The direct connection DC charging loop here refers to the loop in which the DC power supply 52 directly charges the target battery, that is, the loop in which the target battery is directly connected to the charging interface.

[0117] As an example, in step S213, when the required charging voltage of the target battery is greater than the supply voltage range corresponding to the DC power supply 52, it is determined that the upper limit value of the supply voltage of the DC power supply 52 is less than the required charging voltage of the target battery, and at this time, the boost DC charging loop corresponding to the target battery needs to be controlled to be conductive, and the output voltage of the DC power supply 52 is boosted and converted by the bidirectional voltage conversion circuit 4, so that the voltage after the boost and conversion is consistent with the required charging voltage of the target battery, so as to improve the charging efficiency.

[0118] In the example, the boost DC charging loop corresponding to the target battery refers to a loop formed by connecting the two ends of the target battery to the first end and the second end of the bidirectional voltage conversion circuit 4 respectively; and a loop formed by connecting the two ends of the DC power supply 52 to the third end and the second end of the bidirectional voltage conversion circuit 4 respectively. The specific control process is as follows: (1) first control the current output by the positive electrode of the DC power supply 52 to flow back to the negative electrode of the DC power supply 52 through the first inductor L1 and the lower bridge power tube T2 in turn, so as to charge the first inductor L1 with the DC power supply 52; (2) then control the current output by the positive electrode of the DC power supply 52 to flow back to the negative electrode of the DC power supply 52 through the first inductor L1 and the target battery in turn, so as to charge the target battery with the DC power supply 52 and the first inductor L1, so as to achieve the purpose of boost charging.

[0119] As an example, in step S214, when the required charging voltage of the target battery is less than the supply voltage range corresponding to the DC power supply 52, that is, the lower limit value of the supply voltage of the DC power supply 52 is greater than the required charging voltage of the target battery, at this time, it is necessary to control the conduction of the buck DC charging loop corresponding to the target battery, and control the output voltage of the DC power supply 52 to be stepped down by the bidirectional voltage conversion circuit 4, so that the voltage after stepping down is consistent with the required charging voltage of the target battery, so as to avoid that the charging voltage is too large to cause damage to the target battery.

[0120] In the example, the boost DC charging loop corresponding to the target battery refers to a loop formed by connecting the two ends of the target battery to the first end and the second end of the bidirectional voltage conversion circuit 4 respectively; and a loop formed by connecting the two ends of the DC power supply 52 to the third end and the second end of the bidirectional voltage conversion circuit 4 respectively. The specific control process is as follows: (1) first control the conduction of the upper bridge power tube T1, and the lower bridge power tube T2 is disconnected; the current output by the positive electrode of the DC power supply 52 flows back to the negative electrode of the DC power supply 52 through the upper bridge power tube T1, the first inductor L1 and the target battery in turn, at this time, the DC power supply 52 charges the first inductor L1 and the target battery. (2) Then, control the upper bridge power tube T1 to be disconnected, and the lower bridge power tube T2 to be conducted. Since the inductor current cannot be abruptly changed, the current of the first inductor L1 is maintained, and the electric energy is output, a loop is formed among the first inductor L1, the target battery and the lower bridge power tube T1, and the target battery is charged by the first inductor L1. According to the volt-second theorem of inductor, when the input voltage between the two ends of the battery is less than the supply voltage of the DC charging interface during the charging process, the input voltage between the two ends of the battery is adjusted by adjusting the upper bridge power tube T1 and the lower bridge power tube T2, so as to achieve the effect of buck charging. In the example, by using the characteristic that the current of the first inductor L1 does not change abruptly, the charging voltage between the two ends of the target battery can be less than the output voltage of the DC power supply 52 by adjusting the switching frequency of the upper bridge power tube T1 and the lower bridge power tube T2 during the charging process, so as to achieve the effect of buck charging.

[0121] In this embodiment, according to the comparison result of the power supply voltage range corresponding to the direct current power supply 52 and the required charging voltage of the target battery, the different charging circuits corresponding to the target battery are controlled to be turned on to adapt to the specific situation of different direct current power supplies 52 and meet different requirements.

[0122] The embodiment of the present application provides a self-heating method, which is applicable to the charging and discharging system in the above embodiment, comprising:

[0123] S31: obtaining current battery data corresponding to the two batteries;

[0124] S32: determining a battery to be heated based on the current battery data corresponding to the two batteries, controlling the on-off of the switch circuit 3 to turn on the self-heating circuit corresponding to the battery to be heated, and performing self-heating on the battery to be heated.

[0125] As an example, in step S31, the controller needs to obtain the current battery data of the two batteries before determining the target working condition, so as to evaluate whether the battery is in a low-temperature working condition based on the current battery data. The current battery data refers to the battery data retrieved at the current time.

[0126] As an example, in step S32, the controller evaluates and determines that at least one battery is in a low-temperature working condition based on the current battery data corresponding to the two batteries, and determines the battery in the low-temperature working condition as the battery to be heated. For example, when the first battery 1 is in a low-temperature working condition, the first battery 1 is determined as the battery to be heated, and the self-heating circuit corresponding to the battery to be heated is turned on to enable the battery to be heated to perform self-heating operation, thereby increasing the temperature of the battery to be heated to ensure the normal operation of the battery.

[0127] In this example, at least one of the first battery 1 and the second battery 2 is determined as the battery to be heated, and the battery to be heated is connected to the third end and the second end of the bidirectional voltage conversion circuit 4 through the switch circuit 3, and the third end and the second end of the bidirectional voltage conversion circuit 4 are respectively connected to the two ends of the second capacitor C2, forming a self-heating circuit corresponding to the battery to be heated, which performs self-heating on the battery in the self-heating circuit when the self-heating circuit is turned on.

[0128] For example, when the battery to be heated is the first battery 1, the self-heating process is as follows: first, the first battery 1 is connected to the circuit, and then the lower bridge power tube T2 in the bidirectional voltage conversion circuit 4 is turned on and the upper bridge power tube T1 is turned off, so that the first battery 1 charges the first inductor L1 and charges the second capacitor C2 through the diode connected in parallel with the upper bridge power tube T1; then, the lower bridge power tube T2 is turned off and the upper bridge power tube T1 is turned on, and the second capacitor C2 and the first inductor L1 are used to charge the first battery 1 to complete the self-heating process of the battery to be heated.

[0129] For another example, if the battery to be heated includes a first battery 1 and a second battery 2 connected in series, the self-heating process is as follows: first, the switch circuit 3 is controlled to be turned on, so that the first battery 1 and the second battery 2 are connected in series in the circuit; then, the lower bridge power tube T2 in the bidirectional voltage conversion circuit 4 is controlled to be turned on, and the upper bridge power tube T1 is turned off, so that the first battery 1 charges the first inductor L1, and charges the second capacitor C2 and the second battery 2 through the diode connected in parallel with the upper bridge power tube T1; then, the lower bridge power tube T2 is controlled to be turned off, and the upper bridge power tube T1 is turned on, so that the second capacitor C2 and the second battery 2 charge the first battery 1, to complete the self-heating process of the battery to be heated.

[0130] In an embodiment, the step S32, i.e., determining the battery to be heated based on the current battery data corresponding to the two batteries, includes:

[0131] S321: If the current battery data corresponding to one of the two batteries meets the low-temperature working condition corresponding thereto, the battery is determined as the battery to be heated;

[0132] S322: If the current battery data corresponding to the two batteries meets the low-temperature working condition corresponding thereto, the two batteries are determined as the batteries to be heated.

[0133] As an example, in the step S321, after obtaining the current battery data corresponding to the two batteries, the controller compares the current battery data corresponding to the battery with the low-temperature working condition corresponding thereto. If the current battery data of one of the two batteries meets the low-temperature working condition corresponding thereto, the battery is determined as the battery to be heated in the low-temperature working condition, because the temperature thereof is lower, which may affect the normal work, therefore, the self-heating circuit corresponding to the battery to be heated can be controlled to be turned on to perform self-heating on the single battery. For example, if the current battery data of the first battery 1 meets the low-temperature working condition corresponding thereto, and the current battery data of the second battery 2 does not meet the low-temperature working condition corresponding thereto, the self-heating circuit corresponding to the first battery 1 is controlled to perform self-heating on the first battery 1, and this process is not limited by whether the second battery 2 needs to be heated, and the single self-heating operation on the first battery 1 can be realized.

[0134] As an example, in step S322, the controller compares the current battery data of the two batteries with the low-temperature working condition corresponding to the battery after obtaining the current battery data of the two batteries; if both current battery data meet the low-temperature working condition corresponding to the battery, it is determined that the first battery 1 and the second battery 2 are in the low-temperature working condition, at this time, the first battery 1 and the second battery 2 can be determined as the battery to be heated, and the self-heating circuit corresponding to the battery to be heated is used to self-heat the first battery 1 and the second battery 2, so that the mutual heating efficiency of the two batteries is faster, and the battery temperature is quickly improved, so as to ensure the normal work of the battery.

[0135] In an embodiment, the current battery data includes the current battery temperature; and the low-temperature working condition is that the current battery temperature corresponding to the battery is less than the low-temperature temperature threshold corresponding to the battery.

[0136] The current battery temperature is the real-time detected battery temperature. The low-temperature temperature threshold is a pre-set temperature threshold for evaluating whether the battery temperature reaches the low-temperature working condition.

[0137] As an example, when the current battery temperature of the battery to be heated is less than the low-temperature temperature threshold corresponding to the battery to be heated, it is determined that the battery to be heated is in a low-temperature state, which may affect the normal work of the battery to be heated, at this time, the self-heating circuit corresponding to the battery to be heated is controlled to self-heat the battery to be heated, so as to avoid the battery to be heated working in the low-temperature working condition, affecting the current output power, and even existing safety hazards.

[0138] In an embodiment, the current battery data includes the current battery temperature and the current output power; and the low-temperature working condition is that the current battery temperature corresponding to the battery is less than the low-temperature temperature threshold corresponding to the battery, and the current output power corresponding to the battery is less than the low-temperature power threshold corresponding to the battery.

[0139] The current output power of the battery is the real-time detected current output power of the battery in the working process. The low-temperature power threshold is a pre-set power threshold for evaluating whether the current output power affects the normal work.

[0140] As an example, when the current battery temperature of the battery to be heated is less than the low-temperature temperature threshold corresponding to the battery to be heated, and the current output power of the battery to be heated is less than the low-temperature power threshold corresponding to the battery to be heated, it is determined that the battery to be heated is in a low-temperature state, and the low temperature of the battery to be heated has affected the power output, at this time, the self-heating circuit corresponding to the battery to be heated is controlled to self-heat the battery to be heated, so as to avoid the battery to be heated working in the low-temperature working condition, affecting the current output power, and even existing safety hazards.

[0141] This invention provides a drive system, including the battery assembly, power supply interface and drive module 7 as described in the above embodiments; the drive module 7 is connected to the power supply interface and is used to connect to the motor 8.

[0142] In this embodiment, the drive system includes a battery assembly. At least one of the first battery 1 and the second battery 2 can be connected to the circuit via the switching circuit 3 to power the drive module 7, thereby enabling the drive module 7 to drive the motor 8. In this example, the number of drive modules 7 can be one or more, depending on the actual situation. Understandably, in the drive system, at least one of the first battery 1 and the second battery 2 can be controlled to power the drive module 7, enabling the drive module 7 to complete drive control operations.

[0143] In one embodiment, the battery assembly includes at least one second bridge arm; the second bridge arm includes a third power transistor T3 and a fourth power transistor T4 connected in series; at least one third power transistor T3 is connected to form a first end of the drive module 7; at least one fourth power transistor T4 is connected to form a second end of the drive module 7; the first end and the second end of the drive module 7 are connected to the two ends of the target battery, which is a first battery 1 and / or a second battery 2; the connection node between each third power transistor T3 and the fourth power transistor T4 is the midpoint of the second bridge arm and is used to connect the motor 8.

[0144] As an example, such as Figures 1-3 As shown, the drive module 7 includes at least one second bridge arm, which includes a third power transistor T3 and a fourth power transistor T4 connected in series. At least one third power transistor T3 is connected to form the first end of the drive module 7; at least one fourth power transistor T4 is connected to form the second end of the drive module 7. The first end and the second end of the drive module 7 are connected to the two ends of a target battery, which is either the first battery 1 or the second battery 2. The connection node between the third power transistor T3 and the fourth power transistor T4 is the midpoint of the second bridge arm and is used to connect the motor 8. Either the third power transistor T3 or the fourth power transistor T4 is the upper bridge power transistor, and the other is the lower bridge power transistor, used to connect to the negative terminal of the target battery. The upper bridge power transistor is connected to the positive terminal of the target battery and is used to control the forward and reverse rotation of the motor 8. The lower bridge power transistor is connected to the negative terminal of the target battery and is used to control the braking and stopping of the motor 8. In this example, at least one of the first battery 1 and the second battery 2 provides energy to the drive module 7 so that the drive module 7 drives the motor 8.

[0145] This invention provides a drive control method applicable to the drive system described in the above embodiments, comprising:

[0146] S41: When the vehicle is in driving mode, obtain the current vehicle mode;

[0147] S42: controlling the on-off of the switch circuit 3 based on the current mode of the vehicle to realize the connection of the target battery, and controlling the driving module 7 to drive the motor 8 to work;

[0148] The target battery is the first battery 1 and / or the second battery 2.

[0149] As an example, in step S41, the controller can determine the current mode of the vehicle according to the actual situation, for example, the current mode of the vehicle can be any one of the pure electric mode, the hybrid mode, the power feeding mode and the energy supplementing mode.

[0150] As an example, in step S42, the controller can determine the first battery 1 and / or the second battery 2 as the target battery when the vehicle is in the current mode, for example, the first battery 1 can be determined as the target battery, the second battery 2 can be determined as the target battery, or the first battery 1 and the second battery 2 can be determined as the target battery at the same time, the on-off of the switch circuit 3 is controlled to connect the target battery and the driving module 7, the driving module 7 is powered to drive the motor 8 to work, so as to ensure the normal work of the motor 8.

[0151] Since at least one of the first battery 1 and the second battery 2 is determined as the target battery in the battery assembly of the driving system, the switch circuit 3 is used to control the connection of the target battery and the driving module 7, so as to switch the target battery with different energy to power the driving module 7 according to the specific situation, so as to meet the demand of different working conditions. Moreover, the bidirectional voltage conversion circuit 4 can be arranged in the switch circuit 3, and the output voltage of the battery can be controlled to be bidirectionally converted by the bidirectional voltage conversion circuit 4 according to the actual situation in the current mode of the vehicle, that is, the voltage conversion can be both step-up conversion and step-down conversion, so as to provide more energy meeting the demand for the driving motor 8.

[0152] In an embodiment, step S42, that is, controlling the on-off of the switch circuit 3 based on the current mode of the vehicle to realize the connection of the target battery, and controlling the driving module 7 to drive the motor 8 to work, comprises:

[0153] S421: when the current mode of the vehicle is the power feeding mode, the battery with smaller power among the first battery 1 and the second battery 2 is determined as the target battery, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work;

[0154] S422: when the current mode of the vehicle is the pure electric mode, the hybrid mode and the energy supplementing mode, and the demand power of the motor 8 is less than or equal to the larger value of the current output power of the two batteries, the battery corresponding to the larger value of the current output power is determined as the target battery, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work;

[0155] S423: When the current mode of the whole vehicle is the pure electric mode, the hybrid mode and the energy supplement mode, and the demand power of the motor 8 is greater than the greater value of the current output power of the battery, the first battery 1 and the second battery 2 are determined as the target battery, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work.

[0156] As an example, in step S421, when the current mode of the whole vehicle is the power feeding mode, the battery with smaller power among the first battery 1 and the second battery 2, for example, the HEV battery with smaller power among the two batteries of the EV battery and the HEV battery, is determined as the target battery, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work, so as to realize that the battery with smaller power drives the motor 8 to work in the power feeding mode.

[0157] As an example, in step S422, when the current mode of the whole vehicle is not the power feeding mode, but any one of the pure electric mode, the hybrid mode and the energy supplement mode, and the demand power of the motor 8 is less than or equal to the greater value of the current output power of the two batteries, it is determined that the motor 8 with greater current output power can provide the demand power of the motor 8, so the battery corresponding to the greater current output power is determined as the target battery, for example, the EV battery with greater current output power is determined as the target battery alone, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work.

[0158] As an example, in step S423, when the current mode of the whole vehicle is not the power feeding mode, but any one of the pure electric mode, the hybrid mode and the energy supplement mode, and the demand power of the motor 8 is greater than the greater value of the current output power of the two batteries, the power provided by a single battery cannot meet the power demand of the motor 8, so the first battery 1 and the second battery 2 are both determined as the target battery, the on-off of the switch circuit 3 is controlled to realize the connection of the target battery, and the driving module 7 is controlled to drive the motor 8 to work. In the example, when the bidirectional voltage conversion circuit 4 is arranged in the switch circuit 3, the output voltage of the battery can be bidirectionally converted by controlling the bidirectional voltage conversion circuit 4, that is, the voltage can be both stepped up and stepped down, so as to provide the driving motor 8 with more suitable power. For example, when the EV battery with greater current output power alone provides power for the motor 8, the vehicle enters the extreme working conditions such as high-speed overtaking, zero-to-hundred acceleration, extreme escape, high-speed climbing and the like, the demand power of the motor 8 is greater than the current output power of the EV battery, at this time, the EV battery and the HEV battery are connected in series to the two bus bars, so as to realize power supplement when the power is insufficient.

[0159] The embodiment of the present application provides a controller, including a memory, a processor and a computer program stored in the memory and executable on the processor, when the processor executes the computer program, the charging and discharging control method in the above embodiment is implemented, or the self-heating method in the above embodiment is implemented, or the driving control method in the above embodiment is implemented.

[0160] The embodiment of the present application provides an automobile, including the battery assembly in the above embodiment, the charging and discharging system in the above embodiment, or the driving system and the motor 8 in the above embodiment.

[0161] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, when the computer program is executed by the processor, the charging and discharging control method in the above embodiment is implemented, or the self-heating method in the above embodiment is implemented, or the driving control method in the above embodiment is implemented.

[0162] The above described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A battery assembly, comprising: The battery assembly comprises a first battery, a second battery and a switch circuit; The first battery and the second battery are used for connecting a charging interface or a power supply interface; a second end of the first battery is connected with a first end of the first battery; The switch circuit is arranged between the first battery and the second battery, and is used for controlling connection or disconnection of a target battery, the target battery being the first battery and / or the second battery.

2. The battery assembly of claim 1, wherein, The battery assembly further comprises a bidirectional voltage conversion circuit; First and second ends of the bidirectional voltage conversion circuit are used for connecting the charging interface or the power supply interface; Third and second ends of the bidirectional voltage conversion circuit are connected with two ends of the first battery, two ends of the second battery or the first end of the first battery and the second end of the second battery respectively.

3. The battery assembly of claim 2, wherein, The bidirectional voltage conversion circuit comprises at least one voltage conversion unit, and each voltage conversion unit comprises a first bridge arm and a first inductor; First ends of the at least one first bridge arm are connected in common to form the first end of the bidirectional voltage conversion circuit; Second ends of the at least one first bridge arm are connected in common to form the second end of the bidirectional voltage conversion circuit; First ends of the at least one first inductor are connected with midpoints of the first bridge arms, and second ends of the at least one first inductor are connected in common to form the third end of the bidirectional voltage conversion circuit.

4. The battery assembly of claim 2, wherein, The second end of the bidirectional voltage conversion circuit is connected with the first end of the first battery and / or the second end of the second battery; The third end of the bidirectional voltage conversion circuit is connected with a battery connection node, the battery connection node being the second end of the first battery and the first end of the second battery.

5. The battery assembly of any of claims 2-4, wherein, The switch circuit further comprises a first switch and / or a second switch; The first switch is arranged between the second end of the bidirectional voltage conversion circuit and the first end of the first battery; And / or, the second switch is arranged between the second end of the bidirectional voltage conversion circuit and the second end of the second battery.

6. The battery assembly of any one of claims 2-4, wherein, The switch circuit further comprises a third switch; The third switch is arranged between the third end of the bidirectional voltage conversion circuit and the battery connection node.

7. The battery assembly of any one of claims 2-4, wherein, The switch circuit further comprises a seventh switch, and the seventh switch is arranged between the third end of the bidirectional voltage conversion circuit and the first end of the bidirectional voltage conversion circuit.

8. The battery assembly of any one of claims 2-4, wherein, The battery assembly further comprises a first capacitor; Two ends of the first capacitor are connected with the third end of the bidirectional voltage conversion circuit and the second end of the bidirectional voltage conversion circuit respectively.

9. The battery assembly of any of claims 2-4, wherein, The battery assembly further comprises a second capacitor; Two ends of the second capacitor are connected with the first end and the second end of the bidirectional voltage conversion circuit respectively.

10. The battery assembly of claim 9, wherein, Two ends of the second capacitor are also connected with two ends of a target battery, the target battery being the first battery and / or the second battery; The battery assembly further comprises a pre-charge circuit, and the pre-charge circuit is arranged between the target battery and the second capacitor.

11. The battery assembly of claim 1, wherein, The switch circuit comprises a first switch, a second switch and a fourth switch; A first end of the first switch is connected with a first end of the first battery, and a second end of the first switch is used for connecting a charging interface or a power supply interface; The first end of the second switch is connected with the second end of the second battery, and the second end of the second switch is used for connecting the charging interface or the power supply interface; The fourth switch is arranged between the second end of the first battery and the first end of the second battery.

12. The battery assembly of claim 11, wherein, The switch circuit further comprises a fifth switch and a sixth switch; The first end of the fifth switch is arranged between the second end of the first battery and the fourth switch, and the second end of the fifth switch is used for connecting the charging interface or the power supply interface; The first end of the sixth switch is arranged between the first end of the second battery and the fourth switch, and the second end of the sixth switch is used for connecting the charging interface or the power supply interface.

13. The battery assembly of any one of claims 1-4, 11, 12, wherein, The electric quantity of the first battery is greater than the electric quantity of the second battery, or the peak discharge rate of the first battery is less than the peak discharge rate of the second battery.

14. The battery assembly of any one of claims 1-4, 11, 12, wherein, The electric quantity of the first battery is 2-100 times of the electric quantity of the second battery, or the peak discharge rate of the second battery is 2-50 times of the peak discharge rate of the first battery.

15. A charge-discharge system characterized by comprising: The battery assembly, the charging interface and the power supply interface of any one of claims 1-14 are included. The charging interface is used for connecting a charging power supply. The power supply interface is used for connecting a load.

16. The charge and discharge system according to claim 15, wherein The charging interface comprises at least one of an alternating current charging interface and a direct current charging interface, the alternating current charging interface is used for connecting an alternating current power supply, and the direct current charging interface is used for connecting a direct current power supply.

17. A charge and discharge control method characterized by comprising: The charging and discharging system of any one of claims 15-16 is applied to, comprising: Based on a target working condition, the on-off of the switch circuit is controlled to realize the connection of a target battery and control the target battery to charge and discharge; the target battery is the first battery and / or the second battery.

18. The charge and discharge control method according to claim 17, wherein The on-off of the switch circuit is controlled based on the target working condition to realize the connection of the target battery and control the target battery to charge and discharge, comprising: When the target working condition is a discharging working condition, the on-off of the switch circuit is controlled to make the discharging loop corresponding to the target battery conductive to supply power to the load.

19. The charge and discharge control method according to claim 18, characterized by, When the target working condition is a discharging working condition, the on-off of the switch circuit is controlled to make the discharging loop corresponding to the target battery conductive to supply power to the load, comprising: When the target working condition is a discharging working condition, the required supply voltage of the load is obtained; If the output voltage of the target battery is greater than the required supply voltage, the battery with the output voltage greater than the required supply voltage is determined as the target battery, the on-off of the switch circuit is controlled to make the direct connection discharging loop corresponding to the target battery conductive, and the output voltage of the target battery is used to supply power to the load; If the output voltage of the target battery is not greater than the required supply voltage, the battery connected with the bidirectional voltage conversion circuit is determined as the target battery, the on-off of the switch circuit is controlled to make the step-up discharging loop corresponding to the target battery conductive, the output voltage of the target battery is converted by step-up, and the converted voltage is used to supply power to the load.

20. The charge and discharge control method according to claim 17, wherein The on-off of the switch circuit is controlled based on the target working condition to realize the connection of the target battery and control the target battery to charge and discharge, comprising: If the target working condition is a direct current charging working condition, the on-off of the switch circuit is controlled to make a direct current charging loop corresponding to the target battery conductive, so that a direct current power source charges the target battery. If the target working condition is an alternating current charging working condition, the on-off of the switch circuit is controlled to make an alternating current charging loop corresponding to the target battery conductive, so that an alternating current power source charges the target battery.

21. The charge and discharge control method according to claim 20, wherein If the target working condition is a direct current charging working condition, the on-off of the switch circuit is controlled to make a direct current charging loop corresponding to the target battery conductive, so that a direct current power source charges the target battery, including: When the target working condition is a direct current charging working condition, the power supply voltage range of the direct current power source and the required charging voltage of the target battery are obtained. If the required charging voltage is within the power supply voltage range, the on-off of the switch circuit is controlled to make a direct current charging loop corresponding to the target battery conductive. If the required charging voltage is greater than the power supply voltage range, the on-off of the switch circuit is controlled to make a step-up direct current charging loop corresponding to the target battery conductive. If the required charging voltage is less than the power supply voltage range, the on-off of the switch circuit is controlled to make a step-down direct current charging loop corresponding to the target battery conductive.

22. A self-heating method characterized by, Applicable to the battery assembly of any one of claims 1-14, including: Current battery data corresponding to the two batteries is obtained. Based on the current battery data corresponding to the two batteries, a battery to be heated is determined, and the on-off of the switch circuit is controlled to make a self-heating loop corresponding to the battery to be heated conductive, so that the battery to be heated is self-heated.

23. The self-heating method of claim 22, wherein, The determination of the battery to be heated based on the current battery data corresponding to the two batteries includes: If the current battery data corresponding to one of the two batteries meets the low-temperature working condition corresponding to it, the battery is determined as the battery to be heated. If the current battery data corresponding to the two batteries meets the low-temperature working condition corresponding to it, the two batteries are determined as the batteries to be heated.

24. The self-heating method of claim 23, wherein, The current battery data includes the current battery temperature. The low-temperature working condition is that the current battery temperature corresponding to the battery is less than the low-temperature temperature threshold corresponding to it.

25. The self-heating method of claim 23, wherein, The current battery data includes the current battery temperature and the current output power. The low-temperature working condition is that the current battery temperature corresponding to the battery is less than the low-temperature temperature threshold corresponding to it, and the current output power corresponding to the battery is less than the low-temperature power threshold corresponding to it.

26. A drive system characterized by, The battery assembly of any one of claims 1-14 and a driving module are included. The driving module is connected to the power supply interface and is used to connect the motor.

27. A drive control method characterized by comprising: Applicable to the driving system of claim 26, including: When the vehicle is in a driving working condition, the current mode of the whole vehicle is obtained. Based on the current mode of the whole vehicle, the on-off of the switch circuit is controlled to realize the connection of the target battery and control the driving module to drive the motor to work. The target battery is the first battery and / or the second battery.

28. The drive control method according to claim 27, wherein The control of the on-off of the switch circuit based on the current mode of the whole vehicle to realize the connection of the target battery and control the driving module to drive the motor to work includes: In the case that the current mode of the whole vehicle is the feeding mode, the battery with less power among the first battery and the second battery is determined as the target battery, the on-off of the switch circuit is controlled to realize the connection of the target battery, and the driving module is controlled to drive the motor to work; In the case that the current mode of the whole vehicle is the pure electric mode, the hybrid mode and the energy supplement mode, and the demand power of the motor is less than or equal to the larger value of the current output power of the two batteries, the battery corresponding to the larger value of the current output power is determined as the target battery, the on-off of the switch circuit is controlled to realize the connection of the target battery, and the driving module is controlled to drive the motor to work; In the case that the current mode of the whole vehicle is the pure electric mode, the hybrid mode and the energy supplement mode, and the demand power of the motor is greater than the larger value of the current output power of the two batteries, the first battery and the second battery are determined as the target batteries, the on-off of the switch circuit is controlled to realize the connection of the target batteries, and the driving module is controlled to drive the motor to work.

29. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, The processor executes the computer program to realize the charge-discharge control method of any one of claims 17-21, or realize the self-heating method of any one of claims 22-25, or realize the driving control method of any one of claims 27-28.

30. An automobile characterized by comprising: The battery assembly of any one of claims 1-14, the charge-discharge system of any one of claims 15-16, or the driving system and the motor of claim 26.

31. A computer-readable storage medium, the computer-readable storage medium storing a computer program, characterized in that, The computer program is executed by the processor to realize the charge-discharge control method of any one of claims 17-21, or realize the self-heating method of any one of claims 22-25, or realize the driving control method of any one of claims 27-28.

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