Circuit system, electric device, and vehicle operating mode control method

Abstract

The present application provides a circuit system, an electric device, and a vehicle operating mode control method. The circuit system comprises: a battery component, the battery component comprising a first battery pack and a second battery pack; a switching circuit, the switching circuit being connected to the first battery pack and the second battery pack, respectively, and being used for switching the first battery pack and the second battery pack between a series-connected state and a parallel-connected state on the basis of the voltage of the battery component; and a power supplementing module, the power supplementing module being configured to be connected to a load and being used for supplying power to the load in the process of the switching circuit switching the first battery pack and the second battery pack between the series-connected state and the parallel-connected state. The circuit system is used for adjusting the voltage bandwidth of a battery pack to achieve matching between the voltage bandwidth of the battery pack and the operating voltage of the load.

Description

Circuit system, electric device and vehicle operating mode control method CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to the Chinese patent application entitled “Circuit system, electrical device and vehicle operating mode control method” filed on February 1, 2024 (application number: 202410150058.8), the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of power distribution circuits, and more specifically, to a circuit system, an electrical device, and a vehicle operating mode control method. Background Art

[0003] Batteries are a key component of new energy vehicles, providing power. To maximize power, multiple batteries are typically connected in series to form a battery pack, which then powers the vehicle's loads. However, the voltage bandwidths of various battery types vary widely, making them poorly compatible with the voltage bandwidths of charging equipment and loads. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a circuit system, an electrical device, and a vehicle operating mode control method for adjusting the voltage bandwidth of a battery pack to achieve matching of the voltage bandwidth of the battery pack with the operating voltage bandwidth of a load.

[0005] In a first aspect, the present application provides a circuit system, comprising: a battery component, the battery component comprising: a first battery pack and a second battery pack; a switching circuit, the switching circuit being connected to the first battery pack and the second battery pack, respectively, and being used to switch the series-parallel state of the first battery pack and the second battery pack according to the voltage of the battery component, wherein the voltage of the battery component may be the discharge voltage of the battery component; and a power replenishment module, the power replenishment module being configured to be connected to a load, and being used to power 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.

[0006] In an embodiment of the present application, when the voltage of the battery component does not match the operating voltage of the load, the switching circuit converts the two battery packs from series to parallel, adjusting the operating bandwidth of the battery component to match the voltage of the load. Furthermore, due to the short-term power outages that may occur during the switching process between the series and parallel states of the first and second battery packs, including switching from series to parallel and vice versa, a power replenishment module is provided, connected to the load, and power is supplied to the load during the switching circuit switching the first and second battery packs from parallel to series. This allows the load to operate normally during the switching process between the series and parallel states of the first and second battery packs.

[0007] In an optional 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 a series connection to a parallel connection; wherein, the voltage of the battery component may be a discharge voltage of the battery component.

[0008] In an 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 a series connection to a parallel connection. The two battery packs are connected in parallel to reduce the voltage, so that the voltage of the battery component is within the operating voltage range of the load, thereby meeting the normal operation requirements of the load.

[0009] In an optional 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 a parallel connection to a series connection; wherein, the voltage of the battery component may be a discharge voltage of the battery component.

[0010] In an 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 a parallel connection to a series connection. The two battery packs are connected in series to increase the voltage, so that the voltage of the battery component is within the operating voltage range of the load, thereby meeting the normal working requirements of the load.

[0011] In an optional embodiment, the power replenishment 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.

[0012] In the embodiment of the present application, the power supplement module is set as two capacitors, and the load is powered by the two capacitors, which has the advantages of simple implementation and low cost.

[0013] In an optional 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 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; and the fifth switching element is arranged between the first battery pack and the second battery pack.

[0014] In the embodiment of the present application, five switching elements are provided to achieve series-parallel conversion of the first battery pack and the second battery pack, which has the advantages of simple implementation and low cost.

[0015] In an optional embodiment, the circuit system further includes: a charge and discharge switching module and a wireless charging module; the charge and discharge switching module is connected to the switching circuit and the wireless charging module, respectively; the charge and 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.

[0016] In an embodiment of the present application, a charge and discharge switching module and a wireless charging module are provided. 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 and 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 and discharge switching module connects the second battery pack to the wireless charging module, and the wireless charging module wirelessly charges the second battery pack, thereby enabling the vehicle's battery to be charged during driving.

[0017] In an optional embodiment, the charge and discharge switching module includes: a sixth switch element, a seventh switch element, an eighth switch element, a ninth switch element, a tenth switch element, an eleventh switch element, a twelfth switch element and a thirteenth switch element; the sixth switch element and the seventh switch element are arranged on the positive output line of the first battery pack, the sixth switch element is connected to the positive end of the load, and the seventh switch element is connected to the positive end of the wireless charging module through the positive end of the vehicle-mounted charger; the eighth switch element and the ninth switch element are arranged on the negative output line of the first battery pack, and the eighth switch element is connected to the negative end of the load. The ninth switch element is connected to the negative terminal of the wireless charging module through the negative terminal of the vehicle-mounted charger; the tenth switch element and the eleventh switch element are arranged on the positive output line of the second battery pack, the tenth switch element is connected to the positive terminal of the load, and the eleventh switch element is connected to the positive terminal of the wireless charging module through the positive terminal of the vehicle-mounted charger; the twelfth switch element and the thirteenth switch element are arranged on the negative output line of the second battery pack, the twelfth switch element is connected to the negative terminal of the wireless charging module through the negative terminal of the vehicle-mounted charger, and the thirteenth switch element is connected to the negative terminal of the load.

[0018] In an optional embodiment, the circuit system further includes: a charge and 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 and discharge switching module; the charge and 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; and 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.

[0019] In an embodiment of the present application, a first DC charging interface module and a second DC charging interface module are provided. When DC charging is performed on the battery component, the first battery pack and the second battery pack are first switched to a parallel state through a switching circuit, and then the first battery pack is connected to the first DC charging interface module and the second battery pack is connected to the second DC charging interface module through the charge and discharge switching 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 charged respectively through the two DC charging piles, thereby improving the charging efficiency.

[0020] In an optional embodiment, the charge and discharge switching module includes: a sixth switch element, a seventh switch element, an eighth switch element, a ninth switch element, a tenth switch element, an eleventh switch element, a twelfth switch element and a thirteenth switch element; the first DC charging interface module includes a fourteenth switch element and a first DC charging interface, the fourteenth switch element is connected to the positive output end of the first DC charging interface; the second DC charging interface module includes a fifteenth switch element and a second DC charging interface, the fifteenth switch element is connected to the positive output end of the second DC charging interface; the sixth switch element and the seventh switch element are arranged on the positive output line of the first battery pack, the sixth switch element is connected to the fourteenth switch element, and the seventh switch element is connected to the first The fifteenth switching element is connected; 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 output end of the first DC charging interface, and the ninth switching element is connected to the negative output end of the second DC charging interface; 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 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 arranged on the negative output line of the second battery pack, the twelfth switching element is connected to the negative output end of the second DC charging interface, and the thirteenth switching element is connected to the negative output end of the first DC charging interface.

[0021] In a second aspect, the present application provides an electrical device, comprising a circuit system as described in any one of the aforementioned embodiments, wherein the circuit system is used to supply power to the electrical device.

[0022] In a third aspect, the present application provides a vehicle operating mode control method, comprising: obtaining the voltage of a battery component; switching the first battery pack and the second battery pack from a series connection to a parallel connection 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.

[0023] In an optional embodiment, 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 first battery pack and the second battery pack from a parallel connection to a series connection.

[0024] In an optional 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 a 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.

[0025] In an optional 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 a 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 another charging pile through a second DC charging interface module so that the second battery pack is charged through the second DC charging interface module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] FIG1 is a schematic structural diagram of a circuit system provided in an embodiment of the present application;

[0028] FIG2 is a circuit schematic diagram of a circuit system provided in an embodiment of the present application;

[0029] FIG3 is a circuit schematic diagram of another circuit system provided in an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of an electrical device provided in an embodiment of the present application;

[0031] FIG5 is a flow chart of a vehicle operating mode control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0033] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. At the same time, in the description of this 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 that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0034] Furthermore, the term "and / or" in this application is merely a description of an association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The term "plurality" refers to two or more (including two).

[0035] New energy vehicle loads include high-voltage modules such as the motor, on-board charger (OBC), and direct current to direct current converter (DC-DC). These modules form the high-voltage system platform of new energy vehicles. Currently, the mainstream high-voltage system platforms are 400V or 800V. The operating voltage range of the 400V high-voltage system platform is 180V to 490V, while the operating voltage range of the 800V high-voltage system platform is 350V to 760V.

[0036] The battery pack in a new energy vehicle (NEV) is typically composed of multiple cells connected in series, for example, 192 cells in series form a battery pack. Despite the same number of cells in a pack, different battery packs have different voltage ranges. For example, the voltage range of a ternary lithium-ion battery pack is 403.2V to 844.8V, that of a lithium iron phosphate battery pack is 384V to 729.6V, and that of a sodium-ion battery pack is 288V to 844.8V. If a NEV uses an 800V high-voltage system platform, if a ternary lithium-ion battery pack is used as the power source, the high-voltage range 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 used as the power source, the low-voltage range of the sodium-ion battery pack is lower than the minimum operating voltage of the 800V high-voltage system platform, while the high-voltage range of the sodium-ion battery pack is higher than the maximum operating voltage of the 800V high-voltage system platform. This indicates a mismatch between the operating voltage ranges of the battery pack and the high-voltage system platform.

[0037] An embodiment of the present application provides a circuit system, including a battery component, a switching circuit and a power replenishment module. The battery component includes a first battery pack and a second battery pack. The switching circuit is connected to the first battery pack and the second battery pack, respectively. When the voltage of the battery component does not match the operating voltage of the load, the switching circuit converts the two battery packs into series-parallel and adjusts 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 the first battery pack and the second battery pack are switched between the series state and the parallel state, there will be a short period of power outage. By setting up a power replenishment module, the power replenishment module is connected to the load, and the load is powered 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 the first battery pack and the second battery pack switching between the series state and the parallel state.

[0038] Please refer to FIG. 1 , which is a schematic structural diagram of a circuit system provided in an embodiment of the present application. The circuit system 100 may include: a battery component 101 , a switching circuit 102 and a power replenishment module 103 .

[0039] The circuit system 100 can be installed in various electrical devices, such as new energy vehicles, electric boats, electric bicycles, etc. To facilitate understanding of the solution of the present application, the circuit system 100 provided in the embodiment of the present application is described below using the circuit system 100 installed in a new energy vehicle as an example.

[0040] Battery assembly 101 is used to provide power to the load of a new energy vehicle. Battery assembly 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 and second battery packs can be the same or different, and this application does not impose any restrictions on this.

[0041] For example, the battery component 101 includes 192 batteries, and the first battery pack and the second battery pack are each formed by 96 batteries connected in series.

[0042] The switching circuit 102 is connected to the first battery pack and the second battery pack respectively. The switching circuit 102 is used to switch the series-parallel state of the first battery pack and the second battery pack according to the voltage of the battery component 101.

[0043] The voltage of the battery component 101 may be a discharge voltage of the battery component, a voltage of the battery component during charging, etc. The following description will be made by taking the voltage of the battery component 101 as the discharge voltage of the battery component as an example.

[0044] When the first battery pack and the second battery pack are connected in series, 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 connected in parallel, 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.

[0045] For example, battery unit 101 includes 192 ternary lithium-ion batteries, with the first and second battery packs each consisting of 96 ternary lithium-ion batteries connected in series. When the first and second battery packs are connected in series, the discharge voltage of battery unit 101 is between 403.2V and 844.8V (the discharge voltage of battery unit 101 varies with the battery pack charge). When the first and second battery packs are connected in parallel, the discharge voltage of battery unit 101 is between 201.6V and 422.4V.

[0046] Furthermore, the switching circuit 102 is configured to switch the first battery pack and the second battery pack from a series connection to a 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 operating voltage of the load.

[0047] In an embodiment of the present application, the load of the new energy vehicle may include high-voltage modules such as motors and DC-DC, and the operating voltage range of each high-voltage module is the same. Taking the motor as an example, during the driving process of the 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 work 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 first battery pack and the second battery pack from a series connection to a 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.

[0048] For example, during the operation of a new energy vehicle, the motor's operating voltage ranges from 350V to 760V. Battery unit 101 includes 192 ternary lithium-ion batteries, with the first and second battery packs each consisting of 96 ternary lithium-ion batteries connected in series. When the first and second battery packs are connected in series, the discharge voltage of battery unit 101 ranges from 403.2V to 844.8V. When the charge levels of the first and second battery packs are high, the discharge voltage of the series-connected first and second battery packs will exceed the upper limit of the motor's operating voltage of 760V. If the discharge voltage of battery unit 101 exceeds the upper limit of the motor's operating voltage, switching circuit 102 switches the first and second battery packs from a series connection to a parallel connection. When the first and second battery packs are connected in series, the maximum discharge voltage of battery unit 101 is 422.4V, which is no higher than 760V and can meet the motor's operating requirements.

[0049] Furthermore, the switching circuit 102 is configured to switch the first battery pack and the second battery pack from a parallel connection to a 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.

[0050] In the embodiment of the present application, according to circuit principles, switching the two battery packs from a parallel connection to a series connection increases the discharge voltage of the battery unit 101. Therefore, if the first and second battery packs are connected in parallel and the discharge voltage of the battery unit 101 is lower than the lower operating voltage limit of the load, switching the first and second battery packs from a parallel connection to a series connection can increase the discharge voltage of the battery unit 101, thereby bringing the discharge voltage of the battery unit 101 within the operating voltage range of the load.

[0051] For example, during the operation of a new energy vehicle, the motor's operating voltage ranges from 350V to 760V. Battery assembly 101 includes 192 ternary lithium-ion batteries, with the first and second battery packs each consisting of 96 ternary lithium-ion batteries connected in series. When the first and second battery packs are connected in parallel, the discharge voltage of battery assembly 101 ranges from 201.6V to 422.4V. When the charge levels of the first and second battery packs are low, the discharge voltage of the series-connected first and second battery packs will fall below the motor's operating voltage lower limit of 350V. If the discharge voltage of battery assembly 101 falls below the motor's operating voltage lower limit, switching circuit 102 switches the first and second battery packs from parallel to series connection. When the first and second battery packs are connected in series, the minimum discharge voltage of battery assembly 101 is 403.2V, which does not fall below 350V and meets the motor's operating requirements.

[0052] In actual applications, new energy vehicles may be equipped with a battery management system (BMS), which can collect the discharge voltage of the battery unit 101 in real time. By comparing the discharge voltage of the battery unit 101 with the operating voltage range (upper or lower operating voltage limit) of the load, the switching circuit 102 is controlled to switch the series and parallel connection state of the first and second battery packs so that the discharge voltage of the battery unit 101 is within the operating voltage range of the load, meeting the normal operating requirements of the load.

[0053] As an optional embodiment, as shown in FIG2 , the switching circuit 102 may include: a first switch element K1, a second switch element K2, a third switch element K3, a fourth switch element K4, and a fifth switch element K5. The first switch element K1 is provided on the positive output line of the first battery pack; the second switch element K2 is provided on the negative output line of the first battery pack; the third switch element K3 is provided on the positive output line of the second battery pack; the fourth switch element K4 is provided on the negative output line of the second battery pack; and the fifth switch element K5 is provided on the connection line between the negative electrode of the first battery pack and the positive electrode of the second battery pack.

[0054] The first switch element K1, the second switch element K2, the third switch element K3, the fourth switch element K4, and the fifth switch element K5 may be contactors, which are controlled to close and open by low-voltage electromagnetic coils. The low-voltage electromagnetic coils have low electromagnetic radiation, which can reduce electromagnetic radiation interference with the battery component 101.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] As an optional embodiment, as shown in Figure 2, the charging module 103 includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 has one end connected to the positive output line of the first battery pack and the other end connected to the negative output line of the first battery pack. The second capacitor C2 has one end connected to the positive output line of the second battery pack and the other end connected to the negative output line of the second battery pack.

[0062] When the first and second battery packs are connected in parallel, the first battery pack charges the first capacitor C1, and the second battery pack charges the second capacitor C2. When the first and second battery packs transition from a parallel connection to a series connection, the second and third switching elements K2 and K3 are first disconnected, rendering the first and second battery packs unable to supply power to the load. The first and second capacitors C1 and C2 are then connected to the load, discharging to power the load. After the fifth switching element K5 is closed, the positive output line of the first battery pack is connected to the positive terminal of the load, and the negative output line of the second battery pack is connected to the negative terminal of the load. The first and second battery packs are connected in series to supply power to the load. The discharge capacities of the first and second capacitors C1 and C2 meet the load's normal operation requirements. The capacitance values ​​of the first and second capacitors C1 and C2 can be determined based on the discharge capacities required to ensure normal operation. Configuring the power replenishment module 103 as two capacitors to power the load through these two capacitors offers the advantages of simple implementation and low cost.

[0063] In some embodiments, the first capacitor and the second capacitor may be supercapacitors, which have a large discharge capacity and can provide high current and high peak power. Thus, they can output a large power in the short time when the first battery pack and the second battery pack are switched from parallel to series connection to maintain the normal operation of the load.

[0064] In other embodiments, the charging module 103 may also be other components capable of storing electrical energy, such as batteries, transistors, etc. This application does not limit the specific circuit structure of the charging module 103; any circuit structure capable of providing short-term power to the load during the transition from a parallel connection to a series connection between the first and second battery packs may serve as the charging module 103.

[0065] Furthermore, as an optional implementation, the circuit system 100 further includes: a charge-discharge switching module 104 and a wireless charging module 105 .

[0066] The charge-discharge switching module 104 is connected to the switching circuit 102 and the wireless charging module 105. When the switching circuit 102 switches the first and second battery packs into a parallel state, the charge-discharge switching module 104 is configured to connect the first battery pack to the load so that the first battery pack supplies power to the load; and connect the second battery pack to the wireless charging module 105 so that the second battery pack is wirelessly charged by the wireless charging module 105.

[0067] In an embodiment of the present application, when the new energy vehicle is traveling on a road where wireless charging can be performed, the switching circuit 102 switches the first battery pack and the second battery pack to a parallel state, the charge and 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 and 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.

[0068] In addition, the charge and discharge switching module 104 can also connect the second battery pack to the load, and the second battery pack discharges to power the load; the charge and 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.

[0069] Further, as shown in FIG3 , the charge-discharge switching module 104 may include a sixth switch element K6 , a seventh switch element K7 , an eighth switch element K8 , a ninth switch element K9 , a tenth switch element K10 , an eleventh switch element K11 , a twelfth switch element K12 and a thirteenth switch element K13 .

[0070] The sixth switch element K6 and the seventh switch element K7 are provided on the positive output line of the first battery pack. The sixth switch element K6 is connected to the positive terminal of the load, and the seventh switch element K7 is connected to the positive terminal of the wireless charging module 105 via the positive terminal of the OBC. The eighth switch element K8 and the ninth switch element K9 are provided on the negative output line of the first battery pack. The eighth switch element K8 is connected to the negative terminal of the load, and the ninth switch element K9 is connected to the negative terminal of the wireless charging module 105 via the negative terminal of the OBC.

[0071] The tenth switch element K10 and the eleventh switch element K11 are provided on the positive output line of the second battery pack. The tenth switch element K10 is connected to the positive terminal of the load, and the eleventh switch element K11 is connected to the positive terminal of the wireless charging module 105 via the positive terminal of the OBC. The twelfth switch element K12 and the thirteenth switch element K13 are provided on the negative output line of the second battery pack. The twelfth switch element K12 is connected to the negative terminal of the wireless charging module 105 via the negative terminal of the OBC, and the thirteenth switch element K13 is connected to the negative terminal of the load.

[0072] During the wireless charging process, the wireless charging module 105 outputs alternating current (AC), which is converted into direct current (DC) by the OBC module to charge the first battery pack or the second battery pack.

[0073] When the first battery pack is powering the load and the second battery pack is wirelessly charging via the wireless charging module 105, the switching circuit 102 sets the connection between the first and second battery packs to a parallel state. The sixth and eighth switches K6 and K8 in the charge-discharge switching module 104 are closed, forming a loop between the first battery pack and the load, powering the load. The eleventh and twelfth switches K11 and K12 are closed, forming a loop between the second battery pack, the OBC, and the wireless charging module 105, allowing the wireless charging module 105 to charge the second battery pack. All other switches are open, and no other loop is created.

[0074] When the second battery pack is powering the load and the first battery pack is wirelessly charging via the wireless charging module 105, the switching circuit 102 sets the connection between the first and second battery packs to a parallel state. The seventh and ninth switches K7 and K9 in the charge-discharge switching module 104 are closed, forming a loop between the first battery pack, the OBC, and the wireless charging module 105, allowing the wireless charging module 105 to charge the second battery pack. The tenth and thirteenth switches K10 and K13 are closed, forming a loop between the second battery pack and the load, powering the load. All other switches are open, and no other loop is created.

[0075] 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 .

[0076] 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; and 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.

[0077] In the embodiment of the present application, a first DC charging interface module 106 and a second DC charging interface module 107 are provided. When DC charging is performed on the battery component 101, the first battery pack and the second battery pack are first 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 and discharge switching module 104. The first DC charging interface module 106 is connected to one 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, thereby improving the charging rate and charging efficiency.

[0078] Specifically, as shown in FIG3 , the charge-discharge switching module 104 includes a sixth switch element K6, a seventh switch element K7, an eighth switch element K8, a ninth switch element K9, a tenth switch element K10, an eleventh switch element K11, a twelfth switch element K12, and a thirteenth switch element K13. The first DC charging interface module 106 includes a fourteenth switch element K14 and a first DC charging interface 1061. The fourteenth switch 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 switch element K15 and a second DC charging interface 1062. The fifteenth switch element K15 is connected to the positive output terminal of the second DC charging interface 1062.

[0079] The sixth and seventh switching elements K6 and K7 are provided 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 and ninth switching elements K8 and K9 are provided 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.

[0080] The tenth switch element K10 and the eleventh switch element K11 are provided on the positive output line of the second battery pack. The tenth switch element K10 is connected to the fourteenth switch element K14, and the eleventh switch element K11 is connected to the fifteenth switch element K15. The twelfth switch element K12 and the thirteenth switch element K13 are provided on the negative output line of the second battery pack. The twelfth switch element K12 is connected to the negative output terminal of the second DC charging interface 1062, and the thirteenth switch element K13 is connected to the negative output terminal of the first DC charging interface 1061.

[0081] When the first DC charging interface module 106 is connected to a charging station to DC charge the first battery pack, and the second DC charging interface module 107 is connected to another charging station to DC charge the second battery pack, the switching circuit 102 sets the connection state of the first and second battery packs to a parallel state. The sixth switch element K6, the eighth switch element K8, and the fourteenth switch element K14 in the charge-discharge switching module 104 are closed, forming a circuit between the first battery pack and the first DC charging interface module 106. The charging station uses the first DC charging interface module 106 to DC charge the first battery pack. The eleventh switch element K11, the twelfth switch element K12, and the fifteenth switch element K15 are closed, forming a circuit between the second battery pack and the second DC charging interface module 107. The charging station uses the second DC charging interface module 107 to DC charge the second battery pack. This method achieves dual-charger dual charging, with the two charging guns charging the two battery packs separately, improving charging speed.

[0082] Furthermore, as shown in FIG3 , the switching circuit 102 may further include: a first resistor R1 and a sixteenth switch element K61; 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. When charging the first battery pack, the sixteenth switch element K16 is closed, and the first resistor R1 is used to limit the current to prevent instantaneous high current from impacting the first battery pack. When discharging the 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 and the voltage fluctuation caused by the capacitive load.

[0083] Furthermore, as shown in FIG3 , 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. When charging the second battery pack, the seventeenth switch element K17 is closed, and the second resistor R2 is used to limit the current to prevent instantaneous high current from impacting the second battery pack. When the second battery pack is discharging 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 and the voltage fluctuation caused by the capacitive load.

[0084] Furthermore, 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.

[0085] Furthermore, a fuse may be provided on the positive output line of the first battery pack. The fuse is configured to blow when the current on the positive output line of the first battery pack exceeds a threshold, thereby protecting the circuit. For example, as shown in FIG3 , 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.

[0086] Furthermore, 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.

[0087] Furthermore, a fuse may be provided on the positive output line of the second battery pack. The fuse is designed to blow when the current on the positive output line of the first battery pack exceeds a threshold, thereby protecting the circuit. For example, as shown in FIG3 , 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.

[0088] Furthermore, the switching circuit 102 may also adjust the series-parallel state of the first battery pack and the second battery pack according to the voltage of the battery component during the charging process.

[0089] As an optional implementation, the switching circuit 102 is further configured to switch the series-parallel state of the first battery pack and the second battery pack according to the current voltage and charging voltage of the battery component 101 .

[0090] In the embodiment of the present application, considering that the maximum charging voltages of current charging piles on the market have various specifications, 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 fully charged.

[0091] To solve the above problem, the switching circuit 102 can switch the series-parallel state of the first battery pack and the second battery pack according to the current voltage and charging voltage of the battery component 101. The switching method is as follows:

[0092] When 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 connection state;

[0093] In a case where the current voltage of the battery unit 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.

[0094] If the current voltage of the battery unit 101 is lower than the charging voltage, the switching circuit 102 sets the first and second battery packs in series connection, allowing the charging station to charge the first and second battery packs. As charging time increases, the voltage of the battery unit 101 continues to rise. If the current voltage of the battery unit 101 is equal to or higher than the charging voltage, the switching circuit 102 switches the first and second battery packs from series connection to parallel connection, thereby reducing the voltage of the battery unit 101 and allowing the charging station to continue charging the first and second battery packs.

[0095] For example, the maximum voltage of the first battery pack and the second battery pack is 400V. The maximum charging voltage provided by the charging pile is 750V. When the power of the first battery pack and the second battery pack is low, 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 continue to charge the first battery pack and the second battery pack connected in series. 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. The charging pile continues to charge the first battery pack and the second battery pack until they are fully charged.

[0096] Furthermore, as shown in Figure 3, the loads include a motor, a DC-DC converter, a positive temperature coefficient heater (PTC), a hybrid condensing absorption chiller (HCAC), and the like. New energy vehicles may also be equipped with other loads (not shown in Figure 3). Considering the high current drawn by the motor, the PTC, and the HCAC during operation, fuse F3 can be installed on the positive output line of the motor, and fuse F4 can be installed on the positive output lines of the PTC and HCAC to protect the circuits.

[0097] The present application also provides an electric device, as shown in FIG4 . The electric device 400 includes the circuit system 100 of any of the aforementioned embodiments, and the circuit system 100 is used to power the electric device 400. The electric device 400 can be a new energy vehicle, an electric boat, a drone, or other equipment.

[0098] The embodiment of the present application further provides a vehicle operating mode control method, as shown in Figure 5. The vehicle operating mode control method provided by the embodiment of the present application will be described below with reference to Figure 5.

[0099] S1: Get the voltage of the battery component.

[0100] In some embodiments, the voltage of the battery component may be acquired by the vehicle's BMS.

[0101] In other embodiments, a voltage detection device is provided, and the voltage detection device is connected to the battery component to collect the voltage of the battery component.

[0102] S2: When the first battery pack and the second battery pack in the battery unit are connected in series and the voltage of the battery unit is higher than the upper limit of the operating voltage of the vehicle load, the first battery pack and the second battery pack are switched from being connected in series to being connected in parallel.

[0103] 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, the voltage of the battery component is compared with the upper limit of the operating voltage of the vehicle load. If the voltage of the battery component is greater than the upper limit of the operating voltage of the vehicle load, the first battery pack and the second battery pack are switched from a series connection to a parallel connection.

[0104] As an optional implementation manner, the vehicle operating mode control method further includes:

[0105] 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, the first battery pack and the second battery pack are switched from being connected in parallel to being connected in series.

[0106] 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, the voltage of the battery component is compared with the lower limit of the operating voltage of the vehicle load. If the voltage of the battery component is lower than the lower limit of the operating voltage of the vehicle load, the first battery pack and the second battery pack are switched from parallel connection to series connection.

[0107] As an optional implementation manner, the vehicle operating mode control method further includes:

[0108] When the first battery pack and the second battery pack are connected in parallel and can be wirelessly charged, the first battery pack is connected to the load and the second battery pack is connected 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.

[0109] As an optional implementation manner, the vehicle operating mode control method further includes:

[0110] When the first battery pack and the second battery pack are connected in parallel and the vehicle is connected to two charging piles, the first battery pack is connected 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; the second battery pack is connected 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.

[0111] The operating principles of the various modules involved in the embodiment of the vehicle operating mode control method, such as the battery component, the wireless charging module, the first DC charging interface module, the second DC charging interface module, etc., are the same as the operating principles of the corresponding modules in the aforementioned circuit system. To keep the specification concise, they are not repeated here.

[0112] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0113] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0114] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0115] It should be noted that if the function is implemented in the form of a software function 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 the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling 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 method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0116] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A circuit system, characterized in that: include: A battery component, the battery component comprising: a first battery pack and a second battery pack; a switching circuit, the switching circuit being connected to the first battery pack and the second battery pack, respectively, and configured to switch the series-parallel state of the first battery pack and the second battery pack according to the voltage of the battery component; A power replenishment module is configured to be connected to a load and to supply power to the load when 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 switch the first battery pack and the second battery pack from a series connection to a parallel connection 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.

3. The circuit system according to claim 1, wherein: The switching circuit is configured to switch the first battery pack and the second battery pack from a parallel connection to a series connection 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.

4. The circuit system according to claim 1, wherein: The power replenishment 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; and 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 and discharge switching module is connected to the switching circuit and the wireless charging module respectively; the charge and 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.

7. The circuit system according to claim 6, wherein: The charge and discharge switching module includes: a sixth switch element, a seventh switch element, an eighth switch element, a ninth switch element, a tenth switch element, an eleventh switch element, a twelfth switch element and a thirteenth switch element; The sixth and seventh switching elements are arranged on the positive output line of the first battery pack, the sixth switching element being connected to the positive terminal of the load, and the seventh switching element being connected to the positive terminal of the wireless charging module via the positive terminal of the on-board charger. The eighth and ninth switching elements are arranged on the negative output line of the first battery pack, the eighth switching element being connected to the negative terminal of the load, and the ninth switching element being connected to the negative terminal of the wireless charging module via the negative terminal of the on-board charger. The tenth and eleventh switching elements are arranged on the positive output line of the second battery pack, the tenth switching element being connected to the positive terminal of the load, and the eleventh switching element being connected to the positive terminal of the wireless charging module via the positive terminal of the on-board charger. The twelfth and thirteenth switching elements are arranged on the negative output line of the second battery pack, the twelfth switching element being connected to the negative terminal of the wireless charging module via the negative terminal of the on-board charger, and the thirteenth switching element being 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 and 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 and discharge switching module; The charge and 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; and 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, the fourteenth switching element being 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, the fifteenth switching element being connected to the positive output terminal of the second DC charging interface; 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 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 arranged on the negative output line of the first battery pack, the eighth switching element is connected to the negative output end of the first DC charging interface, and the ninth switching element is connected to the negative output end of the second DC charging interface; 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 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 arranged on the negative output line of the second battery pack, the twelfth switching element is connected to the negative output end of the second DC charging interface, and the thirteenth switching element is connected to the negative output end of the first DC charging interface.

10. An electrical device, characterized in that: The circuit system comprises the circuit system according to any one of claims 1 to 9, wherein the circuit system is used to supply power to the electrical device.

11. A vehicle operating mode control method, characterized in that: include: Get the voltage of the battery component; When a first battery pack and a second battery pack in the battery unit are connected in series and a voltage of the battery unit is higher than an upper limit of an operating voltage of a vehicle load, the first battery pack and the second battery pack are switched from a series connection to a parallel connection.

12. The vehicle operating mode control method according to claim 11, characterized in that: The method further comprises: 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, the first battery pack and the second battery pack are switched from parallel connection to series connection.

13. The vehicle operating mode control method according to claim 11, characterized in that: The method further comprises: When the first battery pack and the second battery pack are connected in parallel and can be wirelessly charged, the first battery pack is connected to the load and the second battery pack is connected 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 comprises: When the first battery pack and the second battery pack are connected in parallel and the vehicle is connected to two charging piles, the first battery pack is connected 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; the second battery pack is connected to another 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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