Circuit system, power utilization device and vehicle working mode control method

Abstract

The invention provides a circuit system, a power utilization device and a vehicle working mode control method, the circuit system comprises a battery component, and the battery component comprises a first battery pack and a second battery pack; the switching circuit is respectively connected with the first battery pack and the second battery pack and is used for switching the series-parallel connection state of the first battery pack and the second battery pack according to the voltage of the battery component; and the power supply module is configured to be connected with a load and is used for supplying power to the load in the process that the switching circuit switches the first battery pack and the second battery pack between the series connection state and the parallel connection state. The circuit system is used for adjusting the voltage bandwidth of the battery pack, so that the voltage bandwidth of the battery pack is matched with the working voltage of the load.

Description

Technical Field

[0001] This application relates to the field of distribution circuits, and more particularly, to a circuit system, an electrical device, and a vehicle operating mode control method. Background Art

[0002] Batteries are important components of new energy vehicles and are used to provide power for new energy vehicles. In new energy vehicles, in order to obtain a large power supply, multiple batteries are usually connected in series to form a battery pack, which supplies power to the loads on the new energy vehicle in the form of a battery pack. However, the voltage bandwidths of various types of batteries are different and vary greatly, and their matching degrees with the voltage bandwidths of charging devices and loads are poor. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a circuit system, an electrical device, and a vehicle operating mode control method, which are used to adjust the voltage bandwidth of the battery pack and achieve the matching of the voltage bandwidth of the battery pack with the operating voltage bandwidth of the load.

[0004] In a first aspect, this application provides a circuit system, including: a battery component, the battery component includes: a first battery pack and a second battery pack; a switching circuit, the switching circuit is respectively connected to the first battery pack and the second battery pack, and is used to switch the series-parallel states of the first battery pack and the second battery pack according to the voltage of the battery component, where the voltage of the battery component can be the discharge voltage of the battery component; a charging module, the charging module is configured to be connected to a load, and is used to supply power to the load during the process of the switching circuit switching the first battery pack and the second battery pack between the series state and the parallel state.

[0005] In the embodiments of this application, when the voltage of the battery component does not match the operating voltage of the load, the switching circuit performs series-parallel conversion on the two battery packs to adjust the operating bandwidth of the battery component, so that the voltage of the battery component matches the operating voltage of the load. In addition, since there will be a short-term power outage during the process of switching the first battery pack and the second battery pack between the series state and the parallel state, including switching from the series state to the parallel state and from the parallel state to the series state. By setting up a charging module, the charging module is connected to the load and supplies power to the load during the process of the switching circuit switching the first battery pack and the second battery pack from the parallel state to the series state, so that the load can work normally during the process of switching the first battery pack and the second battery pack between the series state and the parallel state.

[0006] In an alternative embodiment, the switching circuit is configured to: when the first battery pack and the second battery pack are connected in series and the voltage of the battery component is higher than the upper limit of the operating voltage of the load, switch the first battery pack and the second battery pack from series connection to parallel connection; wherein, the voltage of the battery component may be the discharge voltage of the battery component.

[0007] In the embodiment of the present application, when the voltage is higher than the upper limit of the operating voltage of the load, the first battery pack and the second battery pack are switched from series connection to parallel connection. The parallel connection of the two battery packs can reduce the voltage, so that the voltage of the battery component is within the operating voltage range of the load, meeting the normal operating requirements of the load.

[0008] In an alternative embodiment, the switching circuit is configured to: when the first battery pack and the second battery pack are connected in parallel and the voltage of the battery component is lower than the lower limit of the operating voltage of the load, switch the first battery pack and the second battery pack from parallel connection to series connection; wherein, the voltage of the battery component may be the discharge voltage of the battery component.

[0009] In the embodiment of the present application, when the voltage is lower than the lower limit of the operating voltage of the load, the first battery pack and the second battery pack are switched from parallel connection to series connection. The series connection of the two battery packs can increase the voltage, so that the voltage of the battery component is within the operating voltage range of the load, meeting the normal operating requirements of the load.

[0010] In an alternative embodiment, the charging module includes a first capacitor and a second capacitor; one end of the first capacitor is connected to the positive output line of the first battery pack, and the other end is connected to the negative output line of the first battery pack; one end of the second capacitor is connected to the positive output line of the second battery pack, and the other end is connected to the negative output line of the second battery pack.

[0011] In the embodiment of the present application, the charging module is set as two capacitors, and the two capacitors are used to supply power to the load, which has the advantages of simple implementation method and low implementation cost.

[0012] In an alternative embodiment, the switching circuit includes: a first switching element, a second switching element, a third switching element, a fourth switching element and a fifth switching element; the first switching element is disposed on the positive output line of the first battery pack; the second switching element is disposed on the negative output line of the first battery pack; the third switching element is disposed on the positive output line of the second battery pack; the fourth switching element is disposed on the negative output line of the second battery pack; the fifth switching element is disposed between the first battery pack and the second battery pack.

[0013] In the embodiment of the present application, by setting five switching elements, the series-parallel conversion of the first battery pack and the second battery pack is realized, which has the advantages of simple implementation method and low implementation cost.

[0014] In an alternative embodiment, the circuit system further includes: a charge-discharge switching module and a wireless charging module; the charge-discharge switching module is respectively connected to the switching circuit and the wireless charging module; the charge-discharge switching module is configured to: when the switching circuit switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the load so that the first battery pack supplies power to the load; connect the second battery pack to the wireless charging module so that the second battery pack is wirelessly charged through the wireless charging module.

[0015] In the embodiment of the present application, by setting a charge-discharge switching module and a wireless charging module, when on a road where wireless charging is possible, the switching circuit switches the first battery pack and the second battery pack to a parallel state, the charge-discharge switching module connects the first battery pack to the load, and the first battery pack discharges to supply power to the load; the charge-discharge switching module connects the second battery pack to the wireless charging module, and the wireless charging module wirelessly charges the second battery pack, so that the vehicle battery can be charged during driving.

[0016] In an alternative embodiment, the charge-discharge switching module includes: a sixth switching element, a seventh switching element, an eighth switching element, a ninth switching element, a tenth switching element, an eleventh switching element, a twelfth switching element, and a thirteenth switching element; the sixth switching element and the seventh switching element are arranged on the positive output line of the first battery pack, the sixth switching element is connected to the positive terminal of the load, and the seventh switching element is connected to the positive terminal of the wireless charging module through the positive terminal of the on-vehicle charger; the eighth switching element and the ninth switching element are arranged on the negative output line of the first battery pack, the eighth switching element is connected to the negative terminal of the load, and the ninth switching element is connected to the negative terminal of the wireless charging module through the negative terminal of the on-vehicle charger; the tenth switching element and the eleventh switching element are arranged on the positive output line of the second battery pack, the tenth switching element is connected to the positive terminal of the load, and the eleventh switching element is connected to the positive terminal of the wireless charging module through the positive terminal of the on-vehicle charger; the twelfth switching element and the thirteenth switching element are arranged on the negative output line of the second battery pack, the twelfth switching element is connected to the negative terminal of the wireless charging module through the negative terminal of the on-vehicle charger, and the thirteenth switching element is connected to the negative terminal of the load.

[0017] In an alternative embodiment, the circuit system further includes a charge-discharge switching module, a first DC charging interface module, and a second DC charging interface module; the first DC charging interface module and the second DC charging interface module are respectively connected to the charge-discharge switching module; the charge-discharge switching module is configured to: when the switching circuit switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the first DC charging interface module so that the first battery pack is charged through the first DC charging interface module; connect the second battery pack to the second DC charging interface module so that the second battery pack is charged through the second DC charging interface module.

[0018] In the embodiment of the present application, the first DC charging interface module and the second DC charging interface module are provided. When charging the battery component with DC power, first, the switching circuit switches the first battery pack and the second battery pack to a parallel state, and then the charge-discharge switching module connects the first battery pack to the first DC charging interface module and connects the second battery pack to the second DC charging interface module. The first DC charging interface module is connected to one DC charging pile, and the second DC charging interface module is connected to another DC charging pile. The first battery pack and the second battery pack are respectively charged by the two DC charging piles, improving the charging efficiency.

[0019] In an alternative embodiment, the charge and discharge switching module includes: a sixth switching element, a seventh switching element, an eighth switching element, a ninth switching element, a tenth switching element, an eleventh switching element, a twelfth switching element, and a thirteenth switching element; the first DC charging interface module includes a fourteenth switching element and a first DC charging interface, and the fourteenth switching element is connected to the positive output terminal of the first DC charging interface; the second DC charging interface module includes a fifteenth switching element and a second DC charging interface, and the fifteenth switching element is connected to the positive output terminal of the second DC charging interface; the sixth switching element and the seventh switching element are disposed on the positive output line of the first battery pack, the sixth switching element is connected to the fourteenth switching element, and the seventh switching element is connected to the fifteenth switching element; the eighth switching element and the ninth switching element are disposed on the negative output line of the first battery pack, the eighth switching element is connected to the negative output terminal of the first DC charging interface, and the ninth switching element is connected to the negative output terminal of the second DC charging interface; the tenth switching element and the eleventh switching element are disposed on the positive output line of the second battery pack, the tenth switching element is connected to the fourteenth switching element, and the eleventh switching element is connected to the fifteenth switching element; the twelfth switching element and the thirteenth switching element are disposed on the negative output line of the second battery pack, the twelfth switching element is connected to the negative output terminal of the second DC charging interface, and the thirteenth switching element is connected to the negative output terminal of the first DC charging interface.

[0020] In a second aspect, the present application provides an electrical device, including the circuit system according to any one of the foregoing embodiments, and the circuit system is configured to supply power to the electrical device.

[0021] In a third aspect, the present application provides a vehicle working mode control method, including: obtaining the voltage of a battery component; in a case where a first battery pack and a second battery pack in the battery component are connected in series and the voltage of the battery component is higher than the upper limit of the working voltage of a vehicle load, switching the connection of the first battery pack and the second battery pack from series connection to parallel connection.

[0022] In an alternative embodiment, the method further includes: in a case where the first battery pack and the second battery pack are connected in parallel and the voltage of the battery component is lower than the lower limit of the working voltage of the vehicle load, switching the connection of the first battery pack and the second battery pack from parallel connection to series connection.

[0023] In an alternative embodiment, the method further includes: when the first battery pack and the second battery pack are connected in parallel and can be wirelessly charged, connecting the first battery pack to the load and connecting the second battery pack to the wireless charging module, so that the first battery pack powers the load and the second battery pack is wirelessly charged through the wireless charging module.

[0024] In an alternative embodiment, the method further includes: when the first battery pack and the second battery pack are connected in parallel and the vehicle is connected to two charging piles, connecting the first battery pack to one charging pile through the first DC charging interface module, so that the first battery pack is charged through the first DC charging interface module; connecting the second battery pack to the other charging pile through the second DC charging interface module, so that the second battery pack is charged through the second DC charging interface module. Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 A schematic structural diagram of a circuit system provided by an embodiment of the present application;

[0027] Figure 2 A circuit schematic diagram of a circuit system provided by an embodiment of the present application;

[0028] Figure 3 Another circuit schematic diagram of a circuit system provided by an embodiment of the present application;

[0029] Figure 4 A schematic structural diagram of an electrical device provided by an embodiment of the present application;

[0030] Figure 5 A flowchart of a vehicle working mode control method provided by an embodiment of the present application. Detailed Embodiments

[0031] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application.

[0032] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of the present application, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0033] Furthermore, the term "and / or" in the present application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The term "plural" means two or more (including two).

[0034] The loads of new energy vehicles include high-voltage modules such as motors, on-board chargers (OBCs), and direct current to direct current converters (DC-DCs). These high-voltage modules constitute the high-voltage system platform of new energy vehicles. The current mainstream high-voltage system platforms are 400V or 800V. The operating voltage range of the 400V high-voltage system platform is 180V to 490V, and the operating voltage range of the 800V high-voltage system platform is 350V to 760V.

[0035] The battery packs in new energy vehicles are usually formed by connecting multiple batteries in series. For example, 192 batteries are connected in series to form a battery pack. At the same number of series, there are differences in the voltage ranges of battery packs of different systems. For example, the voltage range of a ternary lithium-ion battery pack is 403.2V to 844.8V, the voltage range of a lithium iron phosphate battery pack is 384V to 729.6V, and the voltage range of a sodium-ion battery pack is 288V to 844.8V. When a new energy vehicle adopts an 800V high-voltage system platform, if a ternary lithium-ion battery pack is selected as the power source of the new energy vehicle, the high-voltage interval of the ternary lithium-ion battery pack exceeds the maximum operating voltage of the 800V high-voltage system platform; if a sodium-ion battery pack is selected as the power source of the new energy vehicle, the low-voltage interval of the sodium-ion battery pack is lower than the minimum operating voltage of the 800V high-voltage system platform, and the high-voltage interval of the sodium-ion battery pack is higher than the maximum operating voltage of the 800V high-voltage system platform. Thus, there is a problem of mismatch in the operating voltage intervals between the battery pack and the high-voltage system platform.

[0036] The embodiment of the present application provides a circuit system, which includes a battery component, a switching circuit, and a charging module. The battery component includes a first battery pack and a second battery pack. The switching circuit is respectively connected to the first battery pack and the second battery pack. When the voltage of the battery component does not match the operating voltage of the load, the switching circuit performs series-parallel conversion on the two battery packs to adjust the operating bandwidth of the battery component, so that the voltage of the battery component matches the operating voltage of the load. In addition, since there will be a short-term power outage during the switching process of the first battery pack and the second battery pack between the series state and the parallel state. By setting up a charging module, the charging module is connected to the load, and during the process of the switching circuit switching the first battery pack and the second battery pack from the parallel state to the series state, the load is powered, so that the load can operate normally during the switching process of the first battery pack and the second battery pack between the series state and the parallel state.

[0037] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a circuit system provided by an embodiment of the present application. The circuit system 100 may include: a battery component 101, a switching circuit 102, and a charging module 103.

[0038] The circuit system 100 can be set on various electrical devices, such as: new energy vehicles, electric boats, electric bicycles, etc. For the convenience of understanding the solution of the present application, the following takes the circuit system 100 set on a new energy vehicle as an example to illustrate the circuit system 100 provided by the embodiment of the present application.

[0039] The battery component 101 is used to supply electrical energy to the loads of new energy vehicles. The battery component 101 includes a first battery pack and a second battery pack. Multiple batteries are connected in series to form a battery pack. The number of batteries connected in series in the first battery pack and the second battery pack may be the same or different, and this application does not limit this.

[0040] For example, the battery component 101 includes 192 batteries, and the first battery pack and the second battery pack are respectively formed by connecting 96 batteries in series.

[0041] The switching circuit 102 is respectively connected to the first battery pack and the second battery pack, and the switching circuit 102 is used to switch the series-parallel states of the first battery pack and the second battery pack according to the voltage of the battery component 101.

[0042] The voltage of the battery component 101 can be the discharge voltage of the battery component, the voltage of the battery component during the charging process, etc. The following takes the voltage of the battery component 101 as the discharge voltage of the battery component as an example for introduction and explanation.

[0043] When the first battery pack and the second battery pack are in series connection, the discharge voltage of the battery component 101 is the discharge voltage when the first battery pack and the second battery pack are connected in series; when the first battery pack and the second battery pack are in parallel connection, the discharge voltage of the battery component 101 is the discharge voltage when the first battery pack and the second battery pack are connected in parallel.

[0044] For example, the battery component 101 includes 192 ternary lithium-ion batteries, and the first battery pack and the second battery pack are respectively formed by connecting 96 ternary lithium-ion batteries in series. When the first battery pack and the second battery pack are in series connection, the discharge voltage of the battery component 101 is 403.2V to 844.8V (the discharge voltage of the battery component 101 presents as an interval with the change of the battery pack power); when the first battery pack and the second battery pack are in parallel connection, the discharge voltage of the battery component 101 is 201.6V to 422.4V.

[0045] Further, the switching circuit 102 is configured to switch the first battery pack and the second battery pack from series connection to parallel connection when the first battery pack and the second battery pack are connected in series and the discharge voltage of the battery component 101 is higher than the upper limit of the working voltage of the load.

[0046] In the embodiments of the present application, the loads of new energy vehicles may include high-voltage modules such as motors and DC-DC. The operating voltage ranges of each high-voltage module are the same. Taking the motor as an example, during the driving process of a new energy vehicle, the motor operates under the power supply of the battery component 101. During the operation of the motor, the discharge voltage of the battery component 101 should be within the operating voltage range of the motor so that the motor can operate normally. When the first battery pack and the second battery pack are connected in series, if the discharge voltage of the battery component 101 is higher than the upper limit of the operating voltage of the motor, the switching circuit 102 switches the connection of the first battery pack and the second battery pack from series connection to parallel connection, reducing the discharge voltage of the battery component 101, so that the discharge voltage of the battery component 101 is within the operating voltage range of the motor.

[0047] For example, during the driving process of a new energy vehicle, the operating voltage range of the motor is 350V to 760V. The battery component 101 includes 192 ternary lithium-ion batteries. The first battery pack and the second battery pack are respectively formed by connecting 96 ternary lithium-ion batteries in series. When the first battery pack and the second battery pack are connected in series, the discharge voltage of the battery component 101 is 403.2V to 844.8V. When the power of the first battery pack and the second battery pack is relatively high, the discharge voltage of the first battery pack and the second battery pack connected in series will be higher than the upper limit of the operating voltage of the motor, which is 760V. When the discharge voltage of the battery component 101 is greater than the upper limit of the operating voltage of the motor, the switching circuit 102 switches the connection of the first battery pack and the second battery pack from series connection to parallel connection. When the first battery pack and the second battery pack are connected in series, the maximum value of the discharge voltage of the battery component 101 is 422.4V, which will not be higher than 760V and can meet the operating requirements of the motor.

[0048] Furthermore, the switching circuit 102 is configured to switch the connection of the first battery pack and the second battery pack from parallel connection to series connection when the first battery pack and the second battery pack are connected in parallel and the discharge voltage of the battery component 101 is lower than the lower limit of the operating voltage of the load.

[0049] In the embodiments of the present application, according to the circuit principle, it can be known that after the two battery packs are switched from parallel connection to series connection, the discharge voltage of the battery component 101 will increase. Therefore, when the first battery pack and the second battery pack are connected in parallel and the discharge voltage of the battery component 101 is lower than the lower limit of the operating voltage of the load, switching the connection of the first battery pack and the second battery pack from parallel connection to series connection can increase the discharge voltage of the battery component 101, so that the discharge voltage of the battery component 101 is within the operating voltage range of the load.

[0050] For example, during the driving process of a new energy vehicle, the operating voltage range of the motor is 350V to 760V. The battery component 101 includes 192 ternary lithium-ion batteries, and the first battery pack and the second battery pack are respectively formed by connecting 96 ternary lithium-ion batteries in series. When the first battery pack and the second battery pack are connected in parallel, the discharge voltage of the battery component 101 is 201.6V to 422.4V. When the power of the first battery pack and the second battery pack is low, the discharge voltage of the first battery pack and the second battery pack connected in series will be lower than the lower limit of the operating voltage of the motor, which is 350V. When the discharge voltage of the battery component 101 is lower than the lower limit of the operating voltage of the motor, the switching circuit 102 switches the connection of the first battery pack and the second battery pack from parallel connection to series connection. When the first battery pack and the second battery pack are connected in series, the minimum value of the discharge voltage of the battery component 101 is 403.2V, which will not be lower than 350V and can meet the operating requirements of the motor.

[0051] In the actual application process, a Battery Management System (BMS) can be set on the new energy vehicle. The BMS can collect the discharge voltage of the battery component 101 in real time. By comparing the discharge voltage of the battery component 101 with the operating voltage range (upper limit or lower limit of the operating voltage) of the load, the switching circuit 102 is controlled to switch the series-parallel connection state of the first battery pack and the second battery pack, so that the discharge voltage of the battery component 101 is within the operating voltage range of the load, meeting the normal operating requirements of the load.

[0052] As an alternative implementation, as Figure 2 shown, the switching circuit 102 may include: a first switching element K1, a second switching element K2, a third switching element K3, a fourth switching element K4, and a fifth switching element K5. The first switching element K1 is arranged on the positive output line of the first battery pack; the second switching element K2 is arranged on the negative output line of the first battery pack; the third switching element K3 is arranged on the positive output line of the second battery pack; the fourth switching element K4 is arranged on the negative output line of the second battery pack; the fifth switching element K5 is arranged on the connection line between the negative electrode of the first battery pack and the positive electrode of the second battery pack.

[0053] Among them, the first switching element K1, the second switching element K2, the third switching element K3, the fourth switching element K4, and the fifth switching element K5 can be contactors. The contactors are controlled to close and open through a low-voltage electromagnetic coil. The electromagnetic radiation of the low-voltage electromagnetic coil is small, which can reduce the electromagnetic radiation interference to the battery component 101.

[0054] The first switch element K1, the fourth switch element K4 and the fifth switch element K5 are closed, the second switch element K2 and the third switch element K3 are disconnected, the first battery pack and the second battery pack are connected in series, the positive terminal of the load is connected to the positive output line of the first battery pack, and the negative terminal of the load is connected to the negative output line of the second battery pack. The first battery pack and the second battery pack are connected in series to supply power to the load.

[0055] When the first battery pack and the second battery pack are connected in series, the fifth switch element K5 is first opened, and then the second switch element K2 and the third switch element K3 are closed to convert the first battery pack and the second battery pack from being connected in series to being connected in parallel.

[0056] The fifth switch element K5 is disconnected, the first switch element K1, the second switch element K2, the third switch element K3 and the fourth switch element K4 are closed, the first battery pack and the second battery pack are in parallel, the positive terminal of the load is connected to the positive output line of the first battery pack and the positive output line of the second battery pack, respectively, and the negative terminal of the load is connected to the negative output line of the first battery pack and the negative output line of the second battery pack, respectively. The first battery pack and the second battery pack supply power to the load in parallel.

[0057] When the first battery pack and the second battery pack are connected in parallel, the second switch element K2 and the third switch element K3 are first opened, and then the fifth switch element K5 is closed to convert the first battery pack and the second battery pack from being connected in parallel to being connected in series.

[0058] Furthermore, the charging module 103 is configured to be connected to a load, and to stabilize the supply voltage to the load during the switching process when the switching circuit 102 switches the first battery pack and the second battery pack between the series state and the parallel state, thereby maintaining the power supply to the load.

[0059] When the first and second battery packs switch between series and parallel connections, a brief power outage may occur (battery unit 101 cannot power the load). This inability to power the load during operation of the new energy vehicle presents a safety hazard. A power replenishment module 103 is provided to power the load during the switching between series and parallel connections, ensuring normal operation of the load.

[0060] As an optional implementation, Figure 2As shown, the charging module 103 includes a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 is connected to the positive output line of the first battery pack, and the other end is connected to the negative output line of the first battery pack. One end of the second capacitor C2 is connected to the positive output line of the second battery pack, and the other end is connected to the negative output line of the second battery pack.

[0061] When the first battery pack and the second battery pack are in a parallel connection state, the first battery pack charges the first capacitor C1, and the second battery pack charges the second capacitor C2. During the process of the first battery pack and the second battery pack switching from parallel connection to series connection, the second switching element K2 and the third switching element K3 are first disconnected. At this time, the first battery pack and the second battery pack cannot supply power to the load. The first capacitor C1 and the second capacitor C2 are connected to the load, and the first capacitor C1 and the second capacitor C2 discharge, thereby realizing power supply to the load. After the fifth switching element K5 is closed, the positive output line of the first battery pack is connected to the positive end of the load, and the negative output line of the second battery pack is connected to the negative end of the load. The first battery pack and the second battery pack supply power to the load in series. The discharge capabilities of the first capacitor C1 and the second capacitor C2 meet the requirements for the normal operation of the load. The capacitance values of the first capacitor C1 and the second capacitor C2 can be determined according to the discharge capabilities required to meet the normal operation of the load. The charging module 103 is set as two capacitors, and the two capacitors supply power to the load, which has the advantages of simple implementation method and low implementation cost.

[0062] In some embodiments, the first capacitor and the second capacitor can be supercapacitors. Supercapacitors have a large discharge capacity and can provide high current and high peak power. Thus, within a short time when the first battery pack and the second battery pack switch from parallel to series, they can output a large amount of power to maintain the normal operation of the load.

[0063] In other embodiments, the charging module 103 can also be other components with energy storage capabilities, such as batteries, transistors, etc. The present application does not limit the specific circuit structure of the charging module 103. Any circuit structure that can realize the function of supplying power to the load for a short time during the process of the first battery pack and the second battery pack switching from a parallel state to a series state can be used as the charging module 103.

[0064] Furthermore, as an optional embodiment, the circuit system 100 further includes: a charge-discharge switching module 104 and a wireless charging module 105.

[0065] The charge-discharge switching module 104 is respectively connected to the switching circuit 102 and the wireless charging module 105. The charge-discharge switching module 104 is configured to: when the switching circuit 102 switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the load so that the first battery pack supplies power to the load; connect the second battery pack to the wireless charging module 105 so that the second battery pack is wirelessly charged through the wireless charging module 105.

[0066] In the embodiment of the present application, when the new energy vehicle is driving on a road where wireless charging is available, the switching circuit 102 switches the first battery pack and the second battery pack to a parallel state, the charge-discharge switching module 104 connects the first battery pack to the load, and the first battery pack discharges to supply power to the load; the charge-discharge switching module 104 connects the second battery pack to the wireless charging module 105, and the wireless charging module 105 wirelessly charges the second battery pack.

[0067] In addition, the charge-discharge switching module 104 can also connect the second battery pack to the load, and the second battery pack discharges to supply power to the load; the charge-discharge switching module 104 connects the first battery pack to the wireless charging module 105, and the wireless charging module 105 wirelessly charges the first battery pack.

[0068] Further, as Figure 3 shown, the charge-discharge switching module 104 may include a sixth switching element K6, a seventh switching element K7, an eighth switching element K8, a ninth switching element K9, a tenth switching element K10, an eleventh switching element K11, a twelfth switching element K12, and a thirteenth switching element K13.

[0069] The sixth switching element K6 and the seventh switching element K7 are arranged on the positive output line of the first battery pack. The sixth switching element K6 is connected to the positive terminal of the load, and the seventh switching element K7 is connected to the positive terminal of the wireless charging module 105 through the positive terminal of the OBC. The eighth switching element K8 and the ninth switching element K9 are arranged on the negative output line of the first battery pack. The eighth switching element K8 is connected to the negative terminal of the load, and the ninth switching element K9 is connected to the negative terminal of the wireless charging module 105 through the negative terminal of the OBC.

[0070] The tenth switching element K10 and the eleventh switching element K11 are arranged on the positive output line of the second battery pack. The tenth switching element K10 is connected to the positive terminal of the load, and the eleventh switching element K11 is connected to the positive terminal of the wireless charging module 105 through the positive terminal of the OBC. The twelfth switching element K12 and the thirteenth switching element K13 are arranged on the negative output line of the second battery pack. The twelfth switching element K12 is connected to the negative terminal of the wireless charging module 105 through the negative terminal of the OBC, and the thirteenth switching element K13 is connected to the negative terminal of the load.

[0071] During the wireless charging process, the wireless charging module 105 outputs alternating current, which is converted into direct current by the OBC module to charge the first battery pack or the second battery pack.

[0072] When the first battery pack supplies power to the load and the second battery pack is wirelessly charged through the wireless charging module 105, the switching circuit 102 sets the connection state of the first battery pack and the second battery pack to a parallel state. The sixth switching element K6 and the eighth switching element K8 in the charge-discharge switching module 104 are closed, and the first battery pack forms a loop with the load to supply power to the load. The eleventh switching element K11 and the twelfth switching element K12 are closed, and the second battery pack forms a loop with the OBC and the wireless charging module 105, and the wireless charging module 105 charges the second battery pack. All other switching elements are open, and no other loops are generated.

[0073] When the second battery pack supplies power to the load and the first battery pack is wirelessly charged through the wireless charging module 105, the switching circuit 102 sets the connection state of the first battery pack and the second battery pack to a parallel state. The seventh switching element K7 and the ninth switching element K9 in the charge-discharge switching module 104 are closed, and the first battery pack forms a loop with the OBC and the wireless charging module 105, and the wireless charging module 105 charges the second battery pack. The tenth switching element K10 and the thirteenth switching element K13 are closed, and the second battery pack forms a loop with the load to supply power to the load. All other switching elements are open, and no other loops are generated.

[0074] Furthermore, as an optional implementation, the circuit system 100 may further include: a charge-discharge switching module 104, a first DC charging interface module 106, and a second DC charging interface module 107.

[0075] The first DC charging interface module 106 and the second DC charging interface module 107 are respectively connected to the charge-discharge switching module 104; the charge-discharge switching module 104 is configured to: when the switching circuit 102 switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the first DC charging interface module 106 so that the first battery pack is charged through the first DC charging interface module 106; connect the second battery pack to the second DC charging interface module 107 so that the second battery pack is charged through the second DC charging interface module 107.

[0076] In the embodiment of the present application, the first DC charging interface module 106 and the second DC charging interface module 107 are provided. When charging the battery component 101 with DC power, first, the first battery pack and the second battery pack are switched to a parallel state through the switching circuit 102. Then, the first battery pack is connected to the first DC charging interface module 106 and the second battery pack is connected to the second DC charging interface module 107 through the charge-discharge switching module 104. The first DC charging interface module 106 is connected to a DC charging pile, and the second DC charging interface module 107 is connected to another DC charging pile. The first battery pack and the second battery pack are charged respectively through the two DC charging piles, improving the charging rate and charging efficiency.

[0077] Specifically, as Figure 3 shown, the charge-discharge switching module 104 includes a sixth switching element K6, a seventh switching element K7, an eighth switching element K8, a ninth switching element K9, a tenth switching element K10, an eleventh switching element K11, a twelfth switching element K12, and a thirteenth switching element K13. The first DC charging interface module 106 includes a fourteenth switching element K14 and a first DC charging interface 1061. The fourteenth switching element K14 is connected to the positive output terminal of the first DC charging interface 1061. The second DC charging interface module 107 includes a fifteenth switching element K15 and a second DC charging interface 1062. The fifteenth switching element K15 is connected to the positive output terminal of the second DC charging interface 1062.

[0078] The sixth switching element K6 and the seventh switching element K7 are arranged on the positive output line of the first battery pack. The sixth switching element K6 is connected to the fourteenth switching element K14, and the seventh switching element K7 is connected to the fifteenth switching element K15. The eighth switching element K8 and the ninth switching element K9 are arranged on the negative output line of the first battery pack. The eighth switching element K8 is connected to the negative output terminal of the first DC charging interface 1061, and the ninth switching element K9 is connected to the negative output terminal of the second DC charging interface 1062.

[0079] The tenth switching element K10 and the eleventh switching element K11 are arranged on the positive output line of the second battery pack. The tenth switching element K10 is connected to the fourteenth switching element K14, and the eleventh switching element K11 is connected to the fifteenth switching element K15. The twelfth switching element K12 and the thirteenth switching element K13 are arranged on the negative output line of the second battery pack. The twelfth switching element K12 is connected to the negative output terminal of the second DC charging interface 1062, and the thirteenth switching element K13 is connected to the negative output terminal of the first DC charging interface 1061.

[0080] When a charging pile is connected to the first DC charging interface module 106 to perform DC charging on the first battery pack, and another charging pile is connected to the second DC charging interface module 107 to perform DC charging on the second battery pack, the switching circuit 102 sets the connection state of the first battery pack and the second battery pack to a parallel state. The sixth switch element K6, the eighth switch element K8, and the fourteenth switch element K14 in the charge and discharge switching module 104 are closed. The first battery pack forms a loop with the first DC charging interface module 106, and the charging pile performs DC charging on the first battery pack through the first DC charging interface module 106. The eleventh switch element K11, the twelfth switch element K12, and the fifteenth switch element K15 are closed. The second battery pack forms a loop with the second DC charging interface module 107, and the charging pile performs DC charging on the second battery pack through the second DC charging interface module 107. In the above manner, dual-gun dual-charging is formed, and two charging guns charge two battery packs respectively, improving the charging speed.

[0081] Further, as Figure 3 shown, the switching circuit 102 may further include: a first resistor R1 and a sixteenth switch element K16; one end of the first resistor R1 is connected to one end of the first switch element K1, the other end of the first resistor R1 is connected to one end of the sixteenth switch element K16, and the other end of the sixteenth switch element K16 is connected to the other end of the first switch element K1. In the scenario of charging the first battery pack, the sixteenth switch element K16 is closed, and current limiting is performed through the first resistor R1 to avoid impact on the first battery pack by instantaneous high current. In the scenario of the first battery pack discharging to a load, the sixteenth switch element K16 is closed, and the first resistor R1 is used to reduce the back electromotive force caused by the inductive load of the load and the voltage fluctuation caused by the capacitive load.

[0082] Further, as Figure 3 shown, the switching circuit 102 may further include: a second resistor R2 and a seventeenth switch element K17; one end of the second resistor R2 is connected to one end of the third switch element K3, the other end of the second resistor R2 is connected to one end of the seventeenth switch element K17, and the other end of the seventeenth switch element K17 is connected to the other end of the third switch element K3. In the scenario of charging the second battery pack, the seventeenth switch element K17 is closed, and current limiting is performed through the second resistor R2 to avoid impact on the second battery pack by instantaneous high current. In the scenario of the second battery pack discharging to a load, the seventeenth switch element K17 is closed, and the second resistor R2 is used to reduce the back electromotive force caused by the inductive load of the load and the voltage fluctuation caused by the capacitive load.

[0083] Further, a current sensor I1 may be provided on the positive output line of the first battery pack to detect the current of the positive output line of the first battery pack. For example, one end of the current sensor I1 is connected to the positive electrode of the first battery pack, and the other end is connected to the first switching element K1.

[0084] Further, a fuse may be provided on the positive output line of the first battery pack. The fuse is used to melt when the current on the positive output line of the first battery pack exceeds a threshold value, playing a role in protecting the circuit. For example, Figure 3 as shown, one end of the fuse F1 is connected to the first switching element K1, and the other end is connected to the current sensor I1.

[0085] Further, a current sensor I2 may be provided on the positive output line of the second battery pack to detect the current of the positive output line of the second battery pack. For example, one end of the current sensor I2 is connected to the positive electrode of the second battery pack, and the other end is connected to the third switching element K3.

[0086] Further, a fuse may be provided on the positive output line of the second battery pack. The fuse is used to melt when the current on the positive output line of the first battery pack exceeds a threshold value, playing a role in protecting the circuit. For example, Figure 3 as shown, one end of the fuse F2 is connected to the third switching element K3, and the other end is connected to the current sensor I2.

[0087] Further, the switching circuit 102 may also adjust the series - parallel states of the first battery pack and the second battery pack according to the voltage during the charging process of the battery component.

[0088] As an optional implementation manner, the switching circuit 102 is further configured to switch the series - parallel states of the first battery pack and the second battery pack according to the current voltage and the charging voltage of the battery component 101.

[0089] In the embodiments of the present application, considering that there are various different specifications for the maximum charging voltage of the current market - available charging piles, such as 400V, 750V, etc. If the maximum voltage of the battery component 101 is higher than the maximum voltage provided by the charging pile, the battery component 101 cannot be charged to full charge.

[0090] To solve the above - mentioned problem, the switching circuit 102 may switch the series - parallel states of the first battery pack and the second battery pack according to the current voltage and the charging voltage of the battery component 101, and the switching method is as follows:

[0091] In the case where the current voltage of the battery component 101 is lower than the charging voltage, the connection state of the first battery pack and the second battery pack is switched to a series state;

[0092] When the current voltage of the battery component 101 is equal to or higher than the charging voltage, the connection state of the first battery pack and the second battery pack is switched to a parallel state.

[0093] When the current voltage of the battery component 101 is lower than the charging voltage, the switching circuit 102 sets the first battery pack and the second battery pack in a series state, and the charging pile can charge the first battery pack and the second battery pack. As the charging time increases, the voltage of the battery component 101 continuously rises. When the current voltage of the battery component 101 is equal to or higher than the charging voltage, the switching circuit 102 switches the first battery pack and the second battery pack from the series state to the parallel state, thereby reducing the voltage of the battery component 101, and the charging pile can continue to charge the first battery pack and the second battery pack.

[0094] For example, the maximum voltage of both the first battery pack and the second battery pack is 400V. The maximum charging voltage provided by the charging pile is 750V. When the first battery pack and the second battery pack have low power, the current voltage of the battery component 101 is lower than 750V, and the first battery pack and the second battery pack are charged in series. As the charging time increases, when the series voltage of the battery component 101 reaches 750V, the charging pile can no longer charge the first battery pack and the second battery pack connected in series, and the switching circuit 102 switches the first battery pack and the second battery pack from series to parallel. The voltage of the first battery pack and the second battery pack connected in parallel is 375V, which is lower than the charging voltage of the charging pile, and the charging pile continues to charge the first battery pack and the second battery pack until they are fully charged.

[0095] Furthermore, as Figure 3 shown, the load includes a motor, a DC-DC, an automotive heating system (Positive Temperature Coefficient heater, PTC), a Hybrid Condenser Absorption Chiller (HCAC), etc. Other loads (not marked in Figure 3 ) can also be provided on the new energy vehicle. Considering that the motor, the automotive heating system, and the hybrid condenser absorption chiller have a large current during operation, a fuse F3 can be set on the positive output line of the motor, and a fuse F4 can be set on the positive output lines of the automotive heating system and the hybrid condenser absorption chiller to play a role in protecting the circuit.

[0096] The embodiment of the present application also provides an electrical device. As Figure 4 shown, the electrical device 400 includes the circuit system 100 in any of the foregoing embodiments, and the circuit system 100 is used to supply power to the electrical device 400. The electrical device 400 can be devices such as new energy vehicles, electric boats, and drones.

[0097] The embodiments of the present application also provide a method for controlling a vehicle working mode, as Figure 5 shown. The following will be combined with Figure 5 to illustrate the method for controlling the vehicle working mode provided by the embodiments of the present application.

[0098] S1: Obtain the voltage of the battery component.

[0099] In some embodiments, the voltage of the battery component can be collected by the BMS of the vehicle.

[0100] In other embodiments, a voltage detection device is set up. The voltage detection device is connected to the battery component to collect the voltage of the battery component.

[0101] S2: When the first battery pack and the second battery pack in the battery component are connected in series and the voltage of the battery component is higher than the upper limit of the working voltage of the vehicle load, switch the connection of the first battery pack and the second battery pack from series connection to parallel connection.

[0102] After obtaining the voltage of the battery component, when the first battery pack and the second battery pack in the battery component are connected in series, compare the voltage of the battery component with the upper limit of the working voltage of the vehicle load. If the voltage of the battery component is greater than the upper limit of the working voltage of the vehicle load, switch the connection of the first battery pack and the second battery pack from series connection to parallel connection.

[0103] As an optional implementation manner, the method for controlling the vehicle working mode further includes:

[0104] When the first battery pack and the second battery pack are connected in parallel and the voltage of the battery component is lower than the lower limit of the working voltage of the vehicle load, switch the connection of the first battery pack and the second battery pack from parallel connection to series connection.

[0105] After obtaining the voltage of the battery component, when the first battery pack and the second battery pack in the battery component are connected in parallel, compare the voltage of the battery component with the lower limit of the working voltage of the vehicle load. If the voltage of the battery component is lower than the lower limit of the working voltage of the vehicle load, switch the connection of the first battery pack and the second battery pack from parallel connection to series connection.

[0106] As an optional implementation manner, the method for controlling the vehicle working mode further includes:

[0107] When the first battery pack and the second battery pack are connected in parallel and wireless charging is available, connect the first battery pack to the load and connect the second battery pack to the wireless charging module, so that the first battery pack supplies power to the load and the second battery pack is wirelessly charged through the wireless charging module.

[0108] As an optional implementation manner, the method for controlling the vehicle working mode further includes:

[0109] When the first battery pack and the second battery pack are connected in parallel and the vehicle is connected to two charging piles, connect the first battery pack to one charging pile through the first DC charging interface module so that the first battery pack can be charged through the first DC charging interface module; connect the second battery pack to the other charging pile through the second DC charging interface module so that the second battery pack can be charged through the second DC charging interface module.

[0110] For each module involved in the embodiment of the vehicle working mode control method, such as: battery components, wireless charging module, first DC charging interface module, second DC charging interface module, etc., their working principles are the same as those of the corresponding modules in the foregoing circuit system. For the sake of simplicity of the specification, they will not be elaborated here.

[0111] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

[0112] In addition, the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] Furthermore, in each embodiment of the present application, the functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0114] It should be noted that if a function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0115] The above are only the embodiments of this application and are not used to limit the protection scope of this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A circuit system, characterized in that, Comprising: A battery component, the battery component including: a first battery pack and a second battery pack; A switching circuit, the switching circuit being respectively connected to the first battery pack and the second battery pack, and being configured to switch the series-parallel states of the first battery pack and the second battery pack according to the voltage of the battery component; A charging supplement module, the charging supplement module being configured to be connected to a load and being configured to supply power to the load during the process that the switching circuit switches the first battery pack and the second battery pack between a series state and a parallel state.

2. The circuit system according to claim 1, wherein The switching circuit is configured to: when the first battery pack and the second battery pack are connected in series and the voltage of the battery component is higher than the upper limit of the operating voltage of the load, switch the first battery pack and the second battery pack from being connected in series to being connected in parallel.

3. The circuit system according to claim 1, characterized in that, The switching circuit is configured to: when the first battery pack and the second battery pack are connected in parallel and the voltage of the battery component is lower than the lower limit of the operating voltage of the load, switch the first battery pack and the second battery pack from being connected in parallel to being connected in series.

4. The circuit system according to claim 1, characterized in that The charging supplement module includes a first capacitor and a second capacitor; one end of the first capacitor is connected to the positive output line of the first battery pack, and the other end is connected to the negative output line of the first battery pack; one end of the second capacitor is connected to the positive output line of the second battery pack, and the other end is connected to the negative output line of the second battery pack.

5. The circuit system according to claim 1, wherein The switching circuit includes: a first switching element, a second switching element, a third switching element, a fourth switching element and a fifth switching element; the first switching element is arranged on the positive output line of the first battery pack; the second switching element is arranged on the negative output line of the first battery pack; the third switching element is arranged on the positive output line of the second battery pack; the fourth switching element is arranged on the negative output line of the second battery pack; the fifth switching element is arranged between the first battery pack and the second battery pack.

6. The circuit system according to any one of claims 1 to 5, characterized in that The circuit system further includes: a charge-discharge switching module and a wireless charging module; The charge-discharge switching module is respectively connected to the switching circuit and the wireless charging module; the charge-discharge switching module is configured to: when the switching circuit switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the load so that the first battery pack supplies power to the load; connect the second battery pack to the wireless charging module so that the second battery pack performs wireless charging through the wireless charging module.

7. The circuit system according to claim 6, characterized in that, The charge-discharge switching module includes: a sixth switching element, a seventh switching element, an eighth switching element, a ninth switching element, a tenth switching element, an eleventh switching element, a twelfth switching element and a thirteenth switching element; The sixth switching element and the seventh switching element are arranged on the positive output line of the first battery pack. The sixth switching element is connected to the positive terminal of the load, and the seventh switching element is connected to the positive terminal of the wireless charging module through the positive terminal of the on-vehicle charger. The eighth switching element and the ninth switching element are arranged on the negative output line of the first battery pack. The eighth switching element is connected to the negative terminal of the load, and the ninth switching element is connected to the negative terminal of the wireless charging module through the negative terminal of the on-vehicle charger. The tenth switching element and the eleventh switching element are arranged on the positive output line of the second battery pack. The tenth switching element is connected to the positive terminal of the load, and the eleventh switching element is connected to the positive terminal of the wireless charging module through the positive terminal of the on-vehicle charger. The twelfth switching element and the thirteenth switching element are arranged on the negative output line of the second battery pack. The twelfth switching element is connected to the negative terminal of the wireless charging module through the negative terminal of the on-vehicle charger, and the thirteenth switching element is connected to the negative terminal of the load.

8. The circuit system according to any one of claims 1 to 5, characterized in that The circuit system includes: a charge-discharge switching module, a first DC charging interface module, and a second DC charging interface module. The first DC charging interface module and the second DC charging interface module are respectively connected to the charge-discharge switching module. The charge-discharge switching module is configured to: when the switching circuit switches the first battery pack and the second battery pack to a parallel state, connect the first battery pack to the first DC charging interface module so that the first battery pack is charged through the first DC charging interface module; connect the second battery pack to the second DC charging interface module so that the second battery pack is charged through the second DC charging interface module.

9. The circuit system according to claim 8, wherein, The charge-discharge switching module includes: a sixth switching element, a seventh switching element, an eighth switching element, a ninth switching element, a tenth switching element, an eleventh switching element, a twelfth switching element, and a thirteenth switching element. The first DC charging interface module includes a fourteenth switching element and a first DC charging interface, and the fourteenth switching element is connected to the positive output terminal of the first DC charging interface. The second DC charging interface module includes a fifteenth switching element and a second DC charging interface, and the fifteenth switching element is connected to the positive output terminal of the second DC charging interface. The sixth switching element and the seventh switching element are disposed on the positive output line of the first battery pack. The sixth switching element is connected to the fourteenth switching element, and the seventh switching element is connected to the fifteenth switching element. The eighth switching element and the ninth switching element are disposed on the negative output line of the first battery pack. The eighth switching element is connected to the negative output terminal of the first DC charging interface, and the ninth switching element is connected to the negative output terminal of the second DC charging interface. The tenth switching element and the eleventh switching element are disposed on the positive output line of the second battery pack. The tenth switching element is connected to the fourteenth switching element, and the eleventh switching element is connected to the fifteenth switching element. The twelfth switching element and the thirteenth switching element are disposed on the negative output line of the second battery pack. The twelfth switching element is connected to the negative output terminal of the second DC charging interface, and the thirteenth switching element is connected to the negative output terminal of the first DC charging interface.

10. An electrical device, characterized in that, Comprising the circuit system according to any one of claims 1-9, the circuit system being configured to supply power to the electrical device.

11. A vehicle working mode control method, characterized in that, Comprising: Obtaining the voltage of the battery component; When the first battery pack and the second battery pack in the battery component are connected in series and the voltage of the battery component is higher than the upper limit of the operating voltage of the vehicle load, switching the connection of the first battery pack and the second battery pack from series connection to parallel connection.

12. The vehicle working mode control method according to claim 11, characterized in that, The method further includes: When the first battery pack and the second battery pack are connected in parallel and the voltage of the battery component is lower than the lower limit of the operating voltage of the vehicle load, switching the connection of the first battery pack and the second battery pack from parallel connection to series connection.

13. The vehicle operation mode control method according to claim 11, characterized in that, The method further includes: When the first battery pack and the second battery pack are connected in parallel and wireless charging is possible, connecting the first battery pack to the load and connecting the second battery pack to the wireless charging module, so that the first battery pack supplies power to the load and the second battery pack is wirelessly charged through the wireless charging module.

14. The vehicle operating mode control method according to claim 11, characterized in that, The method further includes: When the first battery pack and the second battery pack are connected in parallel and the vehicle is connected to two charging piles, connecting the first battery pack to one charging pile through the first DC charging interface module, so that the first battery pack is charged through the first DC charging interface module; connecting the second battery pack to the other charging pile through the second DC charging interface module, so that the second battery pack is charged through the second DC charging interface module.

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