Charging device and control method thereof, charging pile, electronic equipment, storage medium and program product

Abstract

The invention discloses a charging device and a control method thereof, a charging pile, electronic equipment, a storage medium and a program product. The charging device comprises a plurality of DCDC modules, one end of each DCDC module is suitable for being connected with a power supply, the other end of each DCDC module is suitable for being connected with a charging terminal, and the charging terminal is suitable for outputting charging current to external equipment; and the on-off device is used for adjusting the number of the DCDC modules for providing the charging power for the charging terminal. According to the charging device, the on-off device can adjust the number of the DCDC modules providing the charging power for the charging terminal according to the charging requirements of different electric vehicles, so that the electric vehicles can be better matched with the charging pile, and the energy conversion efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and more specifically, to a charging device and a control method thereof, a charging pile, an electronic device, a storage medium, and a program product. Background Art

[0002] To meet the growing demand for electric vehicle charging, more charging stations are needed. Due to the hardware limitations of the charging module's power semiconductors, the output voltage of early DC charging stations was generally below 500V DC, which is not compatible with the 400V voltage platform of most electric vehicles. Some models with higher voltage platforms use a step-by-step voltage boost method to match the maximum capacity of the charging station. With the rapid development of the new energy industry, both new energy electric vehicles and DC charging stations have exceeded 500V. The existing stock of early high-voltage models cannot fully utilize the capacity of existing charging stations. How to better match electric vehicles with charging stations to improve energy conversion efficiency is a pressing technical challenge. Summary of the Invention

[0003] The embodiments of the present application provide a charging device and a control method thereof, a charging pile, an electronic device, a storage medium, and a program product, so as to enable electric vehicles to better match the charging pile, thereby improving energy conversion efficiency.

[0004] In a first aspect, embodiments of the present application provide a charging device comprising: a plurality of DC-DC modules, each having one end adapted to be connected to a power source and another end adapted to be connected to a charging terminal adapted to output charging current to an external device; and a switching device configured to adjust the number of DC-DC modules providing charging power to the charging terminal. The switching device can adjust the number of DC-DC modules providing charging power to the charging terminal based on the charging requirements of different electric vehicles.

[0005] According to the charging device of the embodiment of the present application, the on-off device can adjust the number of DCDC modules that provide charging power to the charging terminal according to the charging requirements of different electric vehicles, so that the electric vehicles can better match the charging piles, thereby improving the energy conversion efficiency.

[0006] In one possible implementation, the DCDC module includes: a first DC converter, wherein an input end of the first DC converter is connected to a power supply; a second DC converter, wherein an input end of the second DC converter is connected to the power supply; and a switching device, wherein the switching device is connected to the first DC converter and the second DC converter and is used to control the first DC converter and the second DC converter to be in a parallel mode or a series mode.

[0007] In one possible embodiment, the switching device includes a first switch, a second switch, a third switch, and a fourth switch; the first end of the first switch is connected to the positive output end of the first DC converter, the second end of the first switch is connected to the positive output end of the second DC converter, the first end of the second switch is connected to the negative output end of the first DC converter, and the second end of the second switch is connected to the negative output end of the second DC converter; the first end of the third switch is connected to the positive output end of the first DC converter, the second end of the third switch is connected to the negative output end of the second DC converter, the first end of the fourth switch is connected to the negative output end of the first DC converter, and the second end of the fourth switch is connected to the positive output end of the second DC converter.

[0008] In one possible embodiment, the switching device has a first switching state and a second switching state. In the first switching state, the first switch and the second switch are closed, the third switch and the fourth switch are disconnected, and the first DC converter and the second DC converter are in parallel mode; in the second switching state, the first switch and the second switch are disconnected, the third switch and the fourth switch are closed, and the first DC converter and the second DC converter are in series mode.

[0009] In a possible implementation, the first DC converter adopts a CLLLC circuit or a DAB circuit, and the second DC converter adopts a CLLLC circuit or a DAB circuit.

[0010] In a possible implementation, the switching device includes a first type of switching device, which is disposed between the plurality of DCDC modules and the charging terminal and is used to control the number of DCDC modules connected to the charging terminal.

[0011] In one possible implementation, the DCDC module includes a first DCDC module and a second DCDC module, and the first type of switching device includes a first switching circuit and a second switching circuit, one end of the first switching circuit is connected to the first DCDC module, and the other end is connected to the charging terminal, and one end of the second switching circuit is connected to the second DCDC module, and the other end is connected to the charging terminal.

[0012] In one possible implementation, the first switch circuit includes a fifth switch and a sixth switch, and the second switch circuit includes a seventh switch and an eighth switch; the fifth switch is connected in series between the positive output terminal of the first DCDC module and the positive input terminal of the charging terminal, and the sixth switch is connected in series between the negative output terminal of the first DCDC module and the negative input terminal of the charging terminal; the seventh switch is connected in series between the positive output terminal of the second DCDC module and the positive input terminal of the charging terminal, and the eighth switch is connected in series between the negative output terminal of the second DCDC module and the negative input terminal of the charging terminal.

[0013] In one possible embodiment, the on-off device further includes a second type of on-off device; the second type of on-off device is connected between two adjacent first DCDC modules to control the number of first DCDC modules connected to the charging terminal; and / or the second type of on-off device is connected between two adjacent second DCDC modules to control the number of second DCDC modules connected to the charging terminal.

[0014] In one possible implementation, the second type of on-off device includes a ninth switch and a tenth switch, where the ninth switch is connected in series between the positive output terminals of two adjacent first DCDC modules, and the tenth switch is connected in series between the negative output terminals of two adjacent first DCDC modules; and / or, the second type of on-off device includes an eleventh switch and a twelfth switch, where the eleventh switch is connected in series between the positive output terminals of two adjacent second DCDC modules, and the twelfth switch is connected in series between the negative output terminals of two adjacent second DCDC modules.

[0015] In a possible implementation, the charging terminal includes a charging plug, one end of which is connected to the first type of switching device, and the other end of which is suitable for outputting a charging current to an external device.

[0016] In one possible embodiment, the number of charging plugs is at least two, and the switching device further includes a third type of switching device, which is connected between two adjacent charging plugs and is used to control the number of the first DCDC module and the second DCDC module connected to the charging plugs.

[0017] In a possible implementation, the third type of switching device includes a thirteenth switch and a fourteenth switch. The thirteenth switch is connected in series between the positive input terminals of two adjacent charging plugs, and the fourteenth switch is connected in series between the negative input terminals of two adjacent charging plugs.

[0018] In a second aspect, an embodiment of the present application provides a control method for a charging device, which is applied to the above-mentioned charging device. The control method includes: controlling the on and off of the on-off device to adjust the number of DCDC modules that provide charging power to the charging terminal.

[0019] In one possible implementation, the on-off device includes a first type of on-off device; controlling the on-off of the on-off device to adjust the number of DCDC modules providing charging power to the charging terminal includes: controlling the on-off of the first type of on-off device to adjust the number of DCDC modules providing charging power to the charging terminal, wherein the first type of on-off device is connected between the plurality of DCDC modules and the charging terminal.

[0020] In one possible implementation, the DCDC module includes a first DC converter, a second DC converter, and a switching device; the control method further includes: controlling the switching device to a first switching state so that the first DC converter and the second DC converter are in a parallel mode; or controlling the switching device to a second switching state so that the first DC converter and the second DC converter are in a series mode.

[0021] In one possible embodiment, the DCDC module includes a first DCDC module and a second DCDC module, and the first type of on-off device includes a first switching circuit and a second switching circuit. Controlling the on-off of the first type of on-off device to adjust the number of DCDC modules providing charging power to the charging terminal includes: controlling the first switching circuit to be in a closed state and the second switching circuit to be in an open state, and simultaneously controlling the switching device of the first DCDC module to a first switching state, so that the first DCDC module provides charging power to the charging terminal; or controlling the first switching circuit to be in an open state and the second switching circuit to be in a closed state, and simultaneously controlling the switching device of the second DCDC module to the first switching state, so that the second DCDC module provides charging power to the charging terminal. The first switching circuit is connected between the first DCDC module and the charging terminal, and the second switching circuit is connected between the second DCDC module and the charging terminal.

[0022] In one possible embodiment, the control method further includes: when a first preset condition is met, controlling the first switch circuit and the second switch circuit to be in a closed state, and simultaneously controlling the switching device of the first DCDC module to the first switching state, and the switching device of the second DCDC module to the first switching state, so that the first DCDC module and the second DCDC module provide charging power to the charging terminal; wherein the first preset condition includes: the charging current of the charging terminal is equal to the first preset current, the voltage change rate is equal to the first preset rate, and the duration is greater than the first preset time.

[0023] In a possible embodiment, the control method further includes: when the charging voltage of the charging terminal reaches a first preset voltage, controlling the first switch circuit to be in a closed state and the second switch circuit to be in an open state, and at the same time controlling the switching device of the second DCDC module to a second switching state, so that the first DCDC module provides charging power to the charging terminal.

[0024] In a possible implementation, after the switching device of the second DCDC module switches to the second switching state, the control method further includes: controlling the first switch circuit to be in an open state and the second switch circuit to be in a closed state, so that the second DCDC module provides charging power to the charging terminal.

[0025] In one possible implementation, after the switching device of the second DCDC module is switched to the second switching state, the control method further includes: controlling the first switch circuit to be in an open state and the second switch circuit to be in a closed state, and at the same time controlling the switching device of the first DCDC module to the second switching state, so that the second DCDC module provides charging power to the charging terminal.

[0026] In a possible implementation, after the switching device of the first DCDC module switches to the second switching state, the control method further includes: controlling the first switch circuit and the second switch circuit to be in a closed state, so that the first DCDC module and the second DCDC module provide charging power to the charging terminal.

[0027] In a possible implementation, the control method further includes: when the charging voltage of the charging terminal reaches the total voltage of the external device, adjusting the charging current of the charging terminal to the maximum allowable charging current of the external device.

[0028] In a possible embodiment, the control method also includes: when the charging current of the charging terminal is less than or equal to a second preset current, the demand current of the external device is greater than or equal to a third preset current, and the duration is a second preset time, adjusting the charging current of the charging terminal to the maximum allowable charging current of the external device, and adjusting the charging voltage of the charging terminal to a second voltage value; wherein the third preset current is less than the first preset current, and the third preset current is greater than the second preset current.

[0029] In one possible implementation, the on-off device further includes a second-type on-off device; and the control method further includes: controlling the second-type on-off device to be in a closed state so that two adjacent first DCDC modules provide charging power to the charging terminal; or controlling the second-type on-off device to be in an open state so that one first DCDC module provides charging power to the charging terminal; wherein the second-type on-off device is connected between the two adjacent first DCDC modules.

[0030] In one possible implementation, the on-off device further includes a second-type on-off device; and the control method further includes: controlling the second-type on-off device to be in a closed state so that two adjacent second DCDC modules provide charging power to the charging terminal; or controlling the second-type on-off device to be in an open state so that one second DCDC module provides charging power to the charging terminal; wherein the second-type on-off device is connected between the two adjacent second DCDC modules.

[0031] In one possible implementation, the on-off device further includes a third-type on-off device, and the charging terminal includes at least two charging plugs. The control method further includes: controlling the third-type on-off device to be in a closed state so that one charging plug receives charging power provided by the first DCDC module and the second DCDC module; or controlling the third-type on-off device to be in an open state so that both charging plugs receive charging power provided by the first DCDC module and the second DCDC module; wherein the third-type on-off device is connected between two adjacent charging plugs.

[0032] In a third aspect, an embodiment of the present application provides a charging pile, which includes a charging terminal and the above-mentioned charging device.

[0033] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising: a memory configured to store instructions; and a processor configured to call instructions from the memory and implement the above-mentioned control method of the charging device when executing the instructions.

[0034] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer instructions are stored. When the computer instructions are executed on a computer, the above-mentioned method for controlling the charging device is executed on the computer.

[0035] In a sixth aspect, an embodiment of the present application provides a computer program product, which includes computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned control method of the charging device.

[0036] For the detailed description of the second to sixth aspects of this application and their various implementations, reference can be made to the detailed description of the first aspect and its various implementations. For the beneficial effects of the second to sixth aspects and their various implementations, reference can be made to the beneficial effect analysis of the first aspect and its various implementations, and no further details will be given here.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the composition structure of the charging device provided in the embodiment of the present application Figure 1 ;

[0039] Figure 2 Schematic diagram of the composition structure of the charging device provided in the embodiment of the present application Figure 2 ;

[0040] Figure 3 Schematic diagram of the composition structure of the charging device provided in the embodiment of the present application Figure 3;

[0041] Figure 4 Schematic diagram of the composition structure of the charging device provided in the embodiment of the present application Figure 4 ;

[0042] Figure 5 Schematic diagram of the composition structure of the charging device provided in the embodiment of the present application Figure 5 ;

[0043] Figure 6 A schematic diagram of the structure of the DCDC module provided in an embodiment of the present application;

[0044] Figure 7 A flow chart of a control method for a charging device provided in an embodiment of the present application;

[0045] Figure 8 A schematic diagram of the process of boost charging of the charging device provided in an embodiment of the present application.

[0046] Reference numerals:

[0047] Power supply 100, DCDC module 200, first DC converter 21, second DC converter 22, switching device 23, first DCDC module 210, second DCDC module 220, charging plug 300, first type on-off device 410, second type on-off device 420, third type on-off device 430. DETAILED DESCRIPTION

[0048] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0049] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0050] The following combination Figures 1-8 A charging device and a control method thereof, a charging pile, an electronic device, a storage medium, and a program product according to embodiments of the present invention are described in detail.

[0051] In the examples of this application, refer to Figures 1 to 5As shown, the charging device includes: multiple DC-DC modules 200, one end of each of which is adapted to connect to a power source 100, and the other end of each of which is adapted to connect to a charging terminal, which is adapted to output charging current to an external device; and an on-off device for adjusting the number of DC-DC modules 200 providing charging power to the charging terminal. The external device includes, but is not limited to, an electric vehicle, and the charging terminal includes a charging plug for charging the electric vehicle. The power source 100 can be a power grid system, a separate energy storage device such as a battery, or an energy storage device in a system with power generation capabilities, such as a photovoltaic system. In this case, the power source 200 can also provide power to the charging bus. The power source 100 can also be a power supply device consisting of an AC source and an AC / DC conversion module, as long as the output of the power source 100 is DC power. The DC-DC modules 200 are used to transform the DC power output by the power source 100. The on-off device is used to adjust the number of DC-DC modules 200 providing charging power to the charging terminal, enabling some or all of the DCDC modules 200 to provide charging power to the charging terminal.

[0052] According to the charging device of the embodiment of the present application, the on-off device can control the number of DCDC modules 200 that provide charging power to the charging terminal according to the charging needs of different electric vehicles, so that some or all DCDC modules 200 provide charging power to the charging terminal, and energy circulates in the DC copper bus and cable to achieve energy interaction. The DCDC module 200 can convert the DC power obtained from the power supply 100 (such as the power grid system and other power sources) into voltage and output it to the external device through the on-off device, so that the electric vehicle can better match the charging pile, thereby improving the energy conversion efficiency. As a result, regardless of low-voltage, high-voltage or boost charging models, they can be charged at maximum power without the need for additional interactive equipment. Each electric vehicle can be connected to all DCDC modules 200, reducing the number of DCDC modules 200 in the charging device and improving the energy conversion efficiency. At the same time, the connection method of the on-off device is simple, and it can be easily repaired through the conversion method of the on-off device, improving the stability of the charging device and reducing the cost of the charging device.

[0053] In some embodiments of the present application, reference Figure 6 As shown, the DCDC module 200 includes: a first DC converter 21, the input end of the first DC converter 21 is connected to the power supply 100; a second DC converter 22, the input end of the second DC converter 22 is connected to the power supply 100; a switching device 23, the switching device 23 is connected to the first DC converter 21 and the second DC converter 22, and is used to control the first DC converter 21 and the second DC converter 22 to be in parallel mode or series mode.

[0054] Specifically, the front ends of the first and second DC converters 21, 22 are connected to the power supply 100, and the rear ends are connected to the switching device. When the first and second DC converters 21, 22 are in parallel mode, the output voltage of the DCDC module 200 is less than the voltage value of the voltage switching point, and the DCDC module 200 operates in the low-voltage operating range. When the first and second DC converters 21, 22 are in series mode, the output voltage of the DCDC module 200 is greater than the voltage value of the voltage switching point, and the DCDC module 200 operates in the high-voltage operating range. When the output voltage of the DCDC module 200 exceeds the voltage value of the voltage switching point, the switching device 23 switches the voltage operating range. The voltage value of the voltage switching point between the low-voltage operating range and the high-voltage operating range can be 360V±5V, 500V±5V, or 680V±5V, and the voltage value of the voltage switching point between the low-voltage operating range and the high-voltage operating range can also be other voltage values.

[0055] In some embodiments of the present application, the switching device 23 includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4; a first end of the first switch K1 is connected to the positive output end of the first DC converter 21, a second end of the first switch K1 is connected to the positive output end of the second DC converter 22, a first end of the second switch K2 is connected to the negative output end of the first DC converter 21, and a second end of the second switch K2 is connected to the negative output end of the second DC converter 22; a first end of the third switch K3 is connected to the positive output end of the first DC converter 21, a second end of the third switch K3 is connected to the negative output end of the second DC converter 22, a first end of the fourth switch K4 is connected to the negative output end of the first DC converter 21, and a second end of the fourth switch is connected to the positive output end of the second DC converter 22. Optionally, each of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 can be a switch selected from the group consisting of a relay, a contactor and a semiconductor bidirectional switch, and the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 can be switches of the same type or different types.

[0056] In some embodiments of the present application, the switching device 23 has a first switching state and a second switching state. In the first switching state, the first switch K1 and the second switch K2 are closed, the third switch K3 and the fourth switch K4 are disconnected, and the first DC converter 21 and the second DC converter 22 are in parallel mode; in the second switching state, the first switch K1 and the second switch K2 are disconnected, the third switch K3 and the fourth switch K4 are closed, and the first DC converter 21 and the second DC converter 22 are in series mode.

[0057] In some embodiments of the present application, the first DC converter 21 employs a CLLLC circuit or a DAB circuit, and the second DC converter 22 employs a CLLLC circuit or a DAB circuit. The CLLLC circuit is a bidirectional resonant conversion circuit, and the DAB circuit is a bidirectional active full-bridge circuit. Optionally, the first DC converter 21 and the second DC converter 22 are two identical CLLLC circuits.

[0058] In some embodiments of the present application, the on / off device includes a first-type on / off device 410, which is disposed between multiple DCDC modules 200 and a charging terminal and is used to control the number of DCDC modules 200 connected to the charging terminal. The first-type on / off device 410 is located between the DCDC modules 200 and the charging terminal. Through different on / off control modes, the DCDC modules 200 can be assigned to corresponding charging terminals, thereby charging external devices connected to the charging terminals. This allows electric vehicles to better match charging piles and improve energy conversion efficiency. The configuration of the first-type on / off device 410 controls the charging power provided by the DCDC modules 200 to the charging terminals based on the charging needs of different electric vehicles. Each electric vehicle can be connected to all DCDC modules 200, thereby improving energy conversion efficiency. Furthermore, the first-type on / off device 410 offers a simple connection method, allowing for convenient maintenance through the switching method of the first-type on / off device 410, improving the stability of the charging device and reducing its cost.

[0059] In some embodiments of the present application, the DCDC module 200 includes a first DCDC module 210 and a second DCDC module 220. The first-type on-off device 410 includes a first switching circuit and a second switching circuit. One end of the first switching circuit is connected to the first DCDC module 210 and the other end is connected to the charging terminal. One end of the second switching circuit is connected to the second DCDC module 220 and the other end is connected to the charging terminal. The first-type on-off device 410 controls the on / off of the first switching circuit and the second switching circuit to enable the first DCDC module 210 and / or the second DCDC module 220 to provide charging power to the charging terminal.

[0060] In some embodiments of the present application, the first switch circuit includes a fifth switch K5 and a sixth switch K6, and the second switch circuit includes a seventh switch K7 and an eighth switch K8. The fifth switch K5 is connected in series between the positive output terminal of the first DCDC module 210 and the positive input terminal of the charging terminal, and the sixth switch K6 is connected in series between the negative output terminal of the first DCDC module 210 and the negative input terminal of the charging terminal. The seventh switch K7 is connected in series between the positive output terminal of the second DCDC module 220 and the positive input terminal of the charging terminal, and the eighth switch K8 is connected in series between the negative output terminal of the second DCDC module 220 and the negative input terminal of the charging terminal. Optionally, each of the fifth switch K5, the sixth switch K6, the seventh switch K7, and the eighth switch K8 can be a relay, a contactor, or a semiconductor bidirectional switch, and the fifth switch K5, the sixth switch K6, the seventh switch K7, and the eighth switch K8 can be the same type of switch or different types of switches.

[0061] Optionally, refer to Figures 1 to 5 As shown, there are multiple first DCDC modules 210, multiple second DCDC modules 220, and multiple charging terminals. One first DCDC module 210 corresponds to one second DCDC module 220, and a group of first-type switching devices 410 consisting of a fifth switch K5, a sixth switch K6, a seventh switch K7, and an eighth switch K8 provide charging power to the corresponding charging terminal.

[0062] In some embodiments of the present application, the switching device further includes a second-type switching device 420; the second-type switching device 420 is connected between two adjacent first DCDC modules 210 and is used to control the number of first DCDC modules 210 connected to the charging terminal; and / or the second-type switching device 420 is connected between two adjacent second DCDC modules 220 and is used to control the number of second DCDC modules 220 connected to the charging terminal. By configuring the first-type switching device 410 and the second-type switching device 420, the first DCDC module 210 and / or the second DCDC module 220 can be controlled to provide charging power to the charging terminal according to the charging needs of different electric vehicles. Each electric vehicle can be connected to all first DCDC modules 210 and all second DCDC modules 220, thereby improving energy conversion efficiency. Furthermore, the connection between the first-type switching device 410 and the second-type switching device 420 is simple, allowing for convenient maintenance by switching between the first-type switching device 410 and the second-type switching device 420, thereby improving the stability of the charging device and reducing the cost of the charging device.

[0063] Specifically, the second-type on-off device 420 is located between two adjacent first DCDC modules 210. By controlling the on / off control of the second-type on-off device 420, the two adjacent first DCDC modules 210 can be assigned to the same charging terminal or different charging terminals; and / or, the second-type on-off device 420 is located between two adjacent second DCDC modules 220. By controlling the on / off control of the second-type on-off device 420, the two adjacent second DCDC modules 220 can be assigned to the same charging terminal or different charging terminals, thereby enabling at least one first DCDC module 210 and / or at least one second DCDC module 220 to provide charging power to the charging terminal.

[0064] In some embodiments of the present application, the second-type switching device 420 includes a ninth switch K9 and a tenth switch K10, wherein the ninth switch K9 is connected in series between the positive output terminals of two adjacent first DC-DC modules 210, and the tenth switch K10 is connected in series between the negative output terminals of two adjacent first DC-DC modules 210. Furthermore, the second-type switching device 420 includes an eleventh switch K11 and a twelfth switch K12, wherein the eleventh switch K11 is connected in series between the positive output terminals of two adjacent second DC-DC modules 220, and the twelfth switch K12 is connected in series between the negative output terminals of two adjacent second DC-DC modules 220. Optionally, each of the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 may be a relay, a contactor, or a semiconductor bidirectional switch, and the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 may be the same type of switch or different types of switches.

[0065] In some embodiments of the present application, the charging terminal includes a charging plug 300 , one end of which is connected to the first type of switching device 410 , and the other end of which is adapted to output a charging current to an external device. The charging plug 300 of the charging terminal outputs the charging current to the external device via a charging gun.

[0066] In some embodiments of the present application, there are at least two charging plugs 300, and the switching device further includes a third-type switching device 430. The third-type switching device 430 is connected between two adjacent charging plugs 300 and is used to control the number of first and second DCDC modules 210, 220 connected to the charging plugs 300. By configuring the first, second, and third-type switching devices 410, 420, 430, it is possible to control the first and / or second DCDC modules 210, 220 to provide charging power to the charging plugs 300 based on the charging needs of different electric vehicles. Each electric vehicle can be connected to all of the first and second DCDC modules 210, 220, thereby improving energy conversion efficiency. Furthermore, the connection between the first, second, and third-type switching devices 410, 420, 430 is simple, allowing for convenient maintenance by switching between the first, second, and third-type switching devices 410, 420, 430, thereby improving the stability of the charging device and reducing its cost.

[0067] Specifically, two adjacent charging plugs 300 are connected via a third-type on / off device 430. By controlling the on / off control of the third-type on / off device 430, the first DCDC module 210 and the second DCDC module 220 can be assigned to the same charging plug 300 or two adjacent charging plugs 300, thereby controlling the charging plugs 300 connected to the first DCDC module 210 and the second DCDC module 220. Alternatively, an electric vehicle can be charged simultaneously via two charging cables connected to the two charging plugs 300. The third-type on / off device 430 is located between the dual-charger busbars of the charging plugs 300. By controlling the on / off control of the third-type on / off device 430, some of the first DCDC modules 210 and the second DCDC modules 220 can be assigned to one charging cable connected to the charging plug 300, some to the other charging cable connected to the other charging plug 300, or all of the first DCDC modules 210 and the second DCDC modules 220 can be assigned to the same charging cable connected to the charging plug 300.

[0068] In some embodiments of the present application, the third-type switching device 430 includes a thirteenth switch K13 and a fourteenth switch K14. The thirteenth switch K13 is connected in series between the positive input terminals of two adjacent charging plugs 300, and the fourteenth switch K14 is connected in series between the negative input terminals of two adjacent charging plugs 300. Optionally, each of the thirteenth switch K13 and the fourteenth switch K14 can be a relay, a contactor, or a semiconductor bidirectional switch, and the thirteenth switch K13 and the fourteenth switch K14 can be the same type of switch or different types of switches.

[0069] According to the control method of the charging device of the second embodiment of the present application, which is applied to the above-mentioned charging device, the control method includes: controlling the on and off of the on-off device to adjust the number of DCDC modules 200 providing charging power to the charging terminal.

[0070] According to the control method for a charging device according to an embodiment of the present application, by controlling the on / off switching of a switching device, the number of DCDC modules 200 providing charging power to a charging terminal can be adjusted according to the charging needs of different electric vehicles, enabling some or all of the DCDC modules 200 to provide charging power to the charging terminal. Energy circulates through the DC copper busbar and cables, achieving energy exchange. The DCDC module 200 can convert the DC power obtained from the power source 100 (such as the power grid system or other power source) into a voltage and then output it to the external device through the switching device, enabling the electric vehicle to better match the charging pile, thereby improving energy conversion efficiency.

[0071] In some embodiments of the present application, the switching device includes a first-type switching device 410; controlling the switching device on and off to adjust the number of DCDC modules 200 providing charging power to the charging terminal includes: controlling the switching of the first-type switching device 410 to adjust the number of DCDC modules 200 providing charging power to the charging terminal, wherein the first-type switching device 410 is connected between multiple DCDC modules 200 and the charging terminal. By controlling the switching of the first-type switching device 410, the DCDC modules 200 can be assigned to corresponding charging terminals, thereby charging external devices connected to the charging terminals, enabling electric vehicles to better match charging piles and improving energy conversion efficiency.

[0072] In some embodiments of the present application, a DC-DC module 200 includes a first DC converter 21, a second DC converter 22, and a switching device 23. The control method further includes: controlling the switching device 23 to a first switching state so that the first DC converter 21 and the second DC converter 22 are in parallel mode; or controlling the switching device 23 to a second switching state so that the first DC converter 21 and the second DC converter 22 are in series mode. The DC-DC module 200 can operate in a low-voltage operating range or a high-voltage operating range. When the switching device 23 is controlled to switch to the first switching state, the first DC converter 21 and the second DC converter 22 are in parallel mode, and the DC-DC module 200 operates in the low-voltage operating range; when the switching device 23 is controlled to switch to the second switching state, the first DC converter 21 and the second DC converter 22 are in series mode, and the DC-DC module 200 operates in the high-voltage operating range.

[0073] In some embodiments of the present application, the DCDC module 200 includes a first DCDC module 210 and a second DCDC module 220, and the first-type on-off device 410 includes a first switching circuit and a second switching circuit. Controlling the on and off of the first-type on-off device 410 to adjust the number of DCDC modules 200 providing charging power to the charging terminal includes: controlling the first switching circuit to be in a closed state and the second switching circuit to be in an open state, and simultaneously controlling the switching device 23 of the first DCDC module 210 to be in a first switching state, so that the first DCDC module 210 provides charging power to the charging terminal; or controlling the first switching circuit to be in an open state and the second switching circuit to be in a closed state, and simultaneously controlling the switching device 23 of the second DCDC module 220 to be in the first switching state, so that the second DCDC module 220 provides charging power to the charging terminal. The first switching circuit is connected between the first DCDC module 210 and the charging terminal, and the second switching circuit is connected between the second DCDC module 220 and the charging terminal. When the fifth switch K5 and the sixth switch K6 are closed, the first switch circuit is in a closed state; when the fifth switch K5 and the sixth switch K6 are open, the first switch circuit is in an open state; when the seventh switch K7 and the eighth switch K8 are closed, the second switch circuit is in a closed state; when the seventh switch K7 and the eighth switch K8 are open, the second switch circuit is in an open state. By controlling the on / off of the first switch circuit and the second switch circuit in the first-type on / off device 410, and controlling the corresponding switching device 23 of the first DCDC module 210 or the switching device 23 of the second DCDC module 2200, the first DCDC module 210 or the second DCDC module 220 operates in a low-voltage operating range and provides charging power to the charging terminal. As a result, the first DCDC module 210 alone supplies power to the electric vehicle, or the second DCDC module 220 alone supplies power to the electric vehicle.

[0074] In some embodiments of the present application, the control method further includes: when a first preset condition is met, controlling the first switch circuit and the second switch circuit to be in a closed state, and at the same time controlling the switching device 23 of the first DCDC module 210 to the first switching state, and the switching device 23 of the second DCDC module 220 to the first switching state, so that the first DCDC module 210 and the second DCDC module 220 provide charging power to the charging terminal; wherein the first preset condition includes: the charging current of the charging terminal is equal to the first preset current, the voltage change rate is equal to the first preset rate, and the duration is greater than the first preset time. When the first preset condition is met, the charging device enters the boost output mode, and the first DCDC module 210 and the second DCDC module 220 both operate in the low-voltage working area and provide charging power to the charging terminal, thereby, the first DCDC module 210 and the second DCDC module 220 share the charging power and output it to the electric vehicle at the same time. Optionally, the first preset condition includes: the charging current I of the charging terminal bcl =20A, voltage change rate ΔU bcl =2V / s, duration t1>10s.

[0075] In some embodiments of the present application, the control method further includes: when the charging voltage of the charging terminal reaches a first preset voltage, controlling the first switch circuit to be closed and the second switch circuit to be open, and simultaneously controlling the switching device 23 of the second DCDC module 220 to a second switching state, so that the first DCDC module 210 provides charging power to the charging terminal. When the charging voltage of the charging terminal reaches the first preset voltage, the first DCDC module 210 provides charging power to the charging terminal. The first DCDC module 210 can output the full charging power according to the required voltage and current of the electric vehicle. At this time, the second DCDC module 220 switches to a high-voltage operating range. The switching device 23 of the second DCDC module 220 switches from the first switching state to the second switching state for a switching time (e.g., 3 seconds), which requires voltage discharge, relay activation, and other processes. This time is relatively fixed, and the second DCDC module 220 can discharge the voltage through the discharge circuit. Optionally, the first preset voltage is 500V±5V.

[0076] In some embodiments of the present application, after the switching device 23 of the second DCDC module 220 switches to the second switching state, the control method further includes: controlling the first switch circuit to be in an open state and the second switch circuit to be in a closed state, so that the second DCDC module 220 provides charging power to the charging terminal. After the voltage operating range of the second DCDC module 220 is switched, the second DCDC module 220 operates in the high-voltage operating range, and the second DCDC module 220 fully outputs charging power according to the required voltage and current of the electric vehicle, and the first DCDC module 210 stops supplying power. Through the on-off control of the first and second switch circuits in the first-type on-off device 410, the second DCDC module 220 does not affect the charging power of the electric vehicle during voltage switching. Regardless of whether the vehicle is a low-voltage vehicle, a high-voltage vehicle, or a boost charging vehicle, it can be charged at maximum power without the need for additional interactive equipment, thereby improving conversion efficiency and reducing system costs.

[0077] In some embodiments of the present application, after the switching device 23 of the second DCDC module 220 switches to the second switching state, the control method further includes: controlling the first switch circuit to be in the open state and the second switch circuit to be in the closed state, while simultaneously controlling the switching device 23 of the first DCDC module 210 to the second switching state, so that the second DCDC module 220 provides charging power to the charging terminal. After the voltage operating range of the second DCDC module 220 is switched, the second DCDC module 220 fully outputs the charging power according to the required voltage and current of the electric vehicle. At this time, the first DCDC module 210 is switched to the high-voltage operating range, and the first DCDC module 210 can discharge the voltage through the discharge circuit.

[0078] In some embodiments of the present application, after the switching device 23 of the first DCDC module 210 switches to the second switching state, the control method further includes: controlling the first and second switching circuits to be in a closed state, so that the first and second DCDC modules 210 and 220 provide charging power to the charging terminal. After the voltage operating range of the first DCDC module 210 is switched, the first and second DCDC modules 210 and 220 both operate in the high-voltage operating range, and the first and second DCDC modules 210 and 220 fully output charging power according to the required voltage and current of the electric vehicle. By controlling the on-off of the first and second switching circuits in the first-type switching device 410, the first DCDC module 210 does not affect the charging power of the electric vehicle during voltage switching. Whether low-voltage, high-voltage, or boost-charging models, all vehicles can be charged at maximum power without the need for additional interactive equipment, thereby improving conversion efficiency and reducing system costs.

[0079] When the electric vehicle is a boost charging model, the charging power of the voltage regulation process is evenly divided by the first DCDC module 210 and the second DCDC module 220. At the voltage switching point of the first DCDC module 210 and the second DCDC module 220, one of the modules is exited to switch the voltage working area. This can keep the boost process of the electric vehicle uninterrupted, allowing the charging device to maximize its charging capacity to match the charging power of the electric vehicle.

[0080] In some embodiments of the present application, the control method further includes: when the charging voltage of the charging terminal reaches the total voltage of the external device, adjusting the charging current of the charging terminal to the maximum allowable charging current of the external device. When the charging voltage of the charging terminal rises to equal the total voltage of the external device, voltage regulation is completed, and the charging current of the charging terminal is adjusted to the maximum allowable charging current of the external device until charging is completed.

[0081] In some embodiments of the present application, reference Figure 7 As shown, the control method flow of the charging device is described:

[0082] S1: When an electric vehicle is connected to a charging device for charging, the physical connection, low-voltage auxiliary power supply power-up and charging handshake phase are completed.

[0083] S2: Identify and match the battery charging parameters of the electric vehicle, connect the electric vehicle to the charging device, and enter the charging stage.

[0084] S3: The fifth switch K5 and the sixth switch K6 of the first type switching device 410 are closed, and the first DCDC module 210 operates in the low-voltage operating area and provides charging power to the charging terminal.

[0085] S4: Determine whether the charging terminal meets the first preset condition: the charging current I of the charging terminal bcl =20A, voltage change rate ΔU bcl =2V / s, duration t1>10s; if the first preset condition is not met, proceed to step S5; if the first preset condition is met, proceed to step S6.

[0086] S5: Send the identification bit "non-boosted vehicle" to the charging terminal and charge according to the GB27930 charging standard.

[0087] S6: The identification bit "boost vehicle" is sent to the charging terminal, and the charging device enters the boost output mode. The seventh switch K7 and the eighth switch K8 of the first type on-off device 410 are closed. The first DCDC module 210 and the second DCDC module 220 both operate in the low-voltage working area and provide charging power to the charging terminal.

[0088] S7: Determine the charging voltage U of the charging terminalbcl Whether the first preset voltage is reached; if the charging voltage U bcl If the charging voltage U bcl When the first preset voltage is reached, the process proceeds to step S8 , wherein the first preset voltage is 500V±5V, for example, 495V.

[0089] S8: The first DCDC module 210 is connected to the charging voltage U of the electric vehicle. bcl and charging current I bcl The charging power is fully output, and the second DCDC module 220 is turned off to switch the voltage working range.

[0090] S9: After the second DCDC module 220 is switched, it is put back into output. The second DCDC module 220 is charged according to the charging voltage U bcl and charging current I bcl Full output charging power.

[0091] S10: The first DCDC module 210 turns off to switch the voltage working range.

[0092] S11: After the first DCDC module 210 is switched, it is put back into output. The first DCDC module 210 and the second DCDC module 220 are connected according to the charging voltage U bcl and charging current I bcl Full output charging power.

[0093] S12: Determine the charging voltage U of the charging terminal bcl Whether the total voltage U of the external device is reached bat ; If the charging voltage U bcl The total voltage U of the external equipment is not reached bat , then go to step S11; if the charging voltage U bcl Total voltage U reaching external devices bat , then go to step S13.

[0094] S13: Send the flag "voltage adjustment completed" to the charging terminal, and set the charging current I bcl Adjust to the maximum allowable charging current I of the external device trans , until charging is completed.

[0095] In some embodiments of the present application, the control method further includes: when the charging current of the charging terminal is less than or equal to the second preset current, the demand current of the external device is greater than or equal to the third preset current, and the duration is the second preset time, adjusting the charging current of the charging terminal to the maximum allowable charging current of the external device and adjusting the charging voltage of the charging terminal to a second voltage value; wherein the third preset current is less than the first preset current and the third preset current is greater than the second preset current. bcl Less than or equal to the second preset current, the external device's required current I bcs When the current is greater than or equal to the third preset current and the duration is the second preset time, it is determined that the charging capacity of the charging device is insufficient, and the charging voltage U bcl Adjust to the second voltage value U b , the charging current I bcl Adjust to the maximum allowable charging current I of the external device trans , until charging is completed.

[0096] Specifically, refer to Figure 8 As shown, the boost charging process of the charging device includes: when the charging device enters the boost output mode, the charging device changes from the initial voltage U0 to the voltage change rate ΔU bcl Total voltage to external devices U bat , the charging current I of the charging terminal bcl =20A remains unchanged. The boost charging process ends when one of the following two conditions is met:

[0097] 1. The charging voltage of the charging terminal and the total voltage U of the external device bat When the voltage is equal, the flag "voltage adjustment completed" is sent to the charging terminal, and the charging current I bcl Adjust to the maximum allowable charging current I of the external device trans , until charging is completed.

[0098] 2. If the charging current I of the charging terminal appears during the charging process bcl Less than or equal to the second preset current, the external device's required current I bcs When the current is greater than or equal to the third preset current and the duration is the second preset time, it is determined that the charging capacity of the charging device is insufficient, and the charging voltage U bcl Adjust to the second voltage value U b , the charging current I bcl Adjust to the maximum allowable charging current I of the external device trans Optionally, the second preset current is 8A, the third preset current is 15A, and the second preset time is 1s.

[0099] In some embodiments of the present application, the switching device further includes a second-type switching device 420. The control method further includes: controlling the second-type switching device 420 to be closed so that two adjacent first DCDC modules 210 provide charging power to the charging terminal; or controlling the second-type switching device 420 to be open so that one first DCDC module 210 provides charging power to the charging terminal. The second-type switching device 420 is connected between two adjacent first DCDC modules 210. When the ninth switch K9 and the tenth switch K10 are closed, the second-type switching device 420 connected between the two adjacent first DCDC modules 210 is closed; when the ninth switch K9 and the tenth switch K10 are open, the second-type switching device 420 connected between the two adjacent first DCDC modules 210 is open. By controlling the switching of the second-type switching device 420, the first DCDC module 210 assigned to the charging terminal can be selected, thereby charging an external device connected to the charging terminal, enabling the electric vehicle to better match the charging pile and improving energy conversion efficiency.

[0100] In some embodiments of the present application, the switching device further includes a second-type switching device 420. The control method further includes: controlling the second-type switching device 420 to be closed so that two adjacent second DCDC modules 220 provide charging power to the charging terminal; or controlling the second-type switching device 420 to be open so that one second DCDC module 220 provides charging power to the charging terminal. The second-type switching device 420 is connected between two adjacent second DCDC modules 220. When the eleventh switch K11 and the twelfth switch K12 are closed, the second-type switching device 420 connected between the two adjacent second DCDC modules 220 is closed; when the eleventh switch K11 and the twelfth switch K12 are open, the second-type switching device 420 connected between the two adjacent second DCDC modules 220 is open. By controlling the second-type switching device 420 to be on and off, the second DCDC module 220 assigned to the charging terminal can be selected, thereby charging an external device connected to the charging terminal, enabling the electric vehicle to better match the charging pile and improving energy conversion efficiency.

[0101] In some embodiments of the present application, the second-type on-off device 420 is connected between two adjacent first DCDC modules 210, and at the same time, the second-type on-off device 420 is connected between two adjacent second DCDC modules 220; by controlling the on and off of the second-type on-off device 420, the first DCDC module 210 and the second DCDC module 220 assigned to the charging terminal can be selected, thereby charging the external device connected to the charging terminal, so that the electric vehicle can better match the charging pile, thereby improving the energy conversion efficiency.

[0102] In some embodiments of the present application, the on-off device further includes a third-type on-off device 430, and the charging terminal includes at least two charging plugs 300. The control method further includes: controlling the third-type on-off device 430 to be in a closed state so that one charging plug 300 receives charging power provided by the first DCDC module 210 and the second DCDC module 220; or controlling the third-type on-off device 430 to be in an open state so that both charging plugs 300 receive charging power provided by the first DCDC module 210 and the second DCDC module 220; wherein the third-type on-off device 430 is connected between two adjacent charging plugs 300. When the thirteenth switch K13 and the fourteenth switch K14 are closed, the third-type on-off device 430 is in a closed state; when the thirteenth switch K13 and the fourteenth switch K14 are open, the third-type on-off device 430 is in an open state. By controlling the on / off of the third-type on / off device 430, the first DCDC module 210 and the second DCDC module 220 can be assigned to the same charging plug 300 or two adjacent charging plugs 300, thereby controlling the charging plugs 300 connected to the first DCDC module 210 and the second DCDC module 220, and further charging external devices connected to the charging plugs 300, so that the electric vehicle can better match the charging pile, thereby improving energy conversion efficiency.

[0103] According to the charging pile of the third embodiment of the present application, the charging pile includes a charging terminal and the above-mentioned charging device. The charging plug 300 of the charging terminal charges the electric vehicle through the charging gun. The charging device and the charging terminal can be set in the charging host and the charging terminal of the charging pile in different ways, including but not limited to the following settings: Figure 1 As shown, the charging host includes multiple DCDC modules 200 and a first type of switching device 410, and the charging terminal includes a charging plug 300 and a third type of switching device 430. Figure 2 As shown, the charging host includes multiple DCDC modules 200, a first type of switching device 410 and a second type of switching device 420, and the charging terminal includes a charging plug 300 and a third type of switching device 430. Figure 3As shown, the charging host of the charging pile includes multiple DCDC modules 200, a first type of on-off device 410 and a second type of on-off device 420, and the charging terminal includes a charging plug 300. Figure 4 As shown, the charging host includes multiple DCDC modules 200, a first type of switching device 410 and a third type of switching device 430, and the charging terminal includes a charging plug 300. Figure 5 As shown, the charging host includes multiple DCDC modules 200, a first type of switching device 410, a second type of switching device 420 and a third type of switching device 430, and the charging terminal includes a charging plug 300. Optionally, the charging host of the charging pile may further include a power supply 100.

[0104] According to the charging pile of the embodiment of the present application, the on-off device in the charging device can adjust the number of DCDC modules 200 that provide charging power to the charging terminal according to the charging needs of different electric vehicles, so that some or all DCDC modules 200 provide charging power to the charging terminal, and energy circulates in the DC copper bus and cable to achieve energy interaction. The DCDC module 200 can convert the DC power obtained from the power supply 100 (such as the power grid system and other DC sources) into voltage and output it to the external device through the on-off device, so that the electric vehicle can better match the charging pile, thereby improving the energy conversion efficiency. As a result, regardless of low-voltage, high-voltage or boost charging models, they can be charged at maximum power without the need for additional interactive equipment. Each electric vehicle can be connected to all DCDC modules 200, reducing the number of DCDC modules 200 in the charging pile and improving the energy conversion efficiency. At the same time, the connection method of the on-off device is simple, and it can be easily repaired through the conversion method of the on-off device, improving the stability of the charging pile and reducing the cost of the charging pile.

[0105] According to the electronic device of the fourth embodiment of the present application, the electronic device includes: a memory configured to store instructions; and a processor configured to call instructions from the memory and to implement the above-mentioned control method of the charging device when executing the instructions.

[0106] According to the computer-readable storage medium of the fifth embodiment of the present application, computer instructions are stored on the computer-readable storage medium. When the computer instructions are run on the computer, the computer executes the above-mentioned control method of the charging device.

[0107] According to the computer program product of the sixth embodiment of the present application, the computer program product includes computer instructions. When the computer instructions are run on a computer, the computer executes the above-mentioned control method of the charging device.

[0108] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the systems, methods, electronic devices, and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0109] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0110] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0111] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections, or communication; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0112] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0113] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A charging device, characterized in that: The charging device comprises: a plurality of DCDC modules, one end of each of the plurality of DCDC modules being adapted to be connected to a power source, and the other end of each of the plurality of DCDC modules being adapted to be connected to a charging terminal, wherein the charging terminal is adapted to output a charging current to an external device; and An on-off device is used to adjust the number of the DCDC modules that provide charging power to the charging terminal.

2. The charging device according to claim 1, characterized in that The DCDC module includes: a first DC converter, wherein an input end of the first DC converter is connected to the power supply; a second DC converter, wherein an input end of the second DC converter is connected to the power supply; A switching device is connected to the first DC converter and the second DC converter, and is used to control the first DC converter and the second DC converter to be in a parallel mode or a series mode.

3. The charging device according to claim 2, characterized in that The switching device includes a first switch, a second switch, a third switch and a fourth switch; A first end of the first switch is connected to the positive output end of the first DC converter, a second end of the first switch is connected to the positive output end of the second DC converter, a first end of the second switch is connected to the negative output end of the first DC converter, and a second end of the second switch is connected to the negative output end of the second DC converter; The first end of the third switch is connected to the positive output end of the first DC converter, the second end of the third switch is connected to the negative output end of the second DC converter, the first end of the fourth switch is connected to the negative output end of the first DC converter, and the second end of the fourth switch is connected to the positive output end of the second DC converter.

4. The charging device according to claim 3, characterized in that The switching device has a first switching state and a second switching state, In the first switching state, the first switch and the second switch are closed, the third switch and the fourth switch are open, and the first DC converter and the second DC converter are in the parallel mode; In the second switching state, the first switch and the second switch are disconnected, the third switch and the fourth switch are closed, and the first DC converter and the second DC converter are in the series mode.

5. The charging device according to claim 2, wherein: The first DC converter adopts a CLLLC circuit or a DAB circuit, and the second DC converter adopts a CLLLC circuit or a DAB circuit.

6. The charging device according to any one of claims 1 to 5, characterized in that: The switching device includes a first type of switching device, which is arranged between the plurality of DCDC modules and the charging terminal, and is used to control the number of the DCDC modules connected to the charging terminal.

7. The charging device according to claim 6, characterized in that The DCDC module includes a first DCDC module and a second DCDC module, and the first type of switching device includes a first switching circuit and a second switching circuit, one end of the first switching circuit is connected to the first DCDC module, and the other end is connected to the charging terminal, and one end of the second switching circuit is connected to the second DCDC module, and the other end is connected to the charging terminal.

8. The charging device according to claim 7, characterized in that The first switch circuit includes a fifth switch and a sixth switch, and the second switch circuit includes a seventh switch and an eighth switch; The fifth switch is connected in series between the positive output terminal of the first DCDC module and the positive input terminal of the charging terminal, and the sixth switch is connected in series between the negative output terminal of the first DCDC module and the negative input terminal of the charging terminal; The seventh switch is connected in series between the positive output terminal of the second DCDC module and the positive input terminal of the charging terminal, and the eighth switch is connected in series between the negative output terminal of the second DCDC module and the negative input terminal of the charging terminal.

9. The charging device according to claim 7, characterized in that The on-off device further includes a second-type on-off device; the second-type on-off device is connected between two adjacent first DCDC modules to control the number of the first DCDC modules connected to the charging terminal; and / or the second-type on-off device is connected between two adjacent second DCDC modules to control the number of the second DCDC modules connected to the charging terminal.

10. The charging device according to claim 9, characterized in that The second type of switching device includes a ninth switch and a tenth switch, wherein the ninth switch is connected in series between the positive output terminals of two adjacent first DCDC modules, and the tenth switch is connected in series between the negative output terminals of two adjacent first DCDC modules; and / or, The second type of switching device includes an eleventh switch and a twelfth switch. The eleventh switch is connected in series between the positive output terminals of two adjacent second DCDC modules, and the twelfth switch is connected in series between the negative output terminals of two adjacent second DCDC modules.

11. The charging device according to any one of claims 7 to 10, characterized in that: The charging terminal includes a charging plug, one end of which is connected to the first type of switching device, and the other end of which is suitable for outputting charging current to the external device.

12. The charging device according to claim 11, characterized in that The number of the charging plugs is at least two, and the switching device further includes a third type of switching device, which is connected between two adjacent charging plugs and is used to control the number of the first DCDC module and the second DCDC module connected to the charging plugs.

13. The charging device according to claim 12, characterized in that: The third type of on-off device includes a thirteenth switch and a fourteenth switch. The thirteenth switch is connected in series between the positive input terminals of two adjacent charging plugs, and the fourteenth switch is connected in series between the negative input terminals of two adjacent charging plugs.

14. A method for controlling a charging device, characterized in that: Applied to the charging device according to any one of claims 1 to 13, the control method includes: The on / off switching of the on / off device is controlled to adjust the number of the DCDC modules providing charging power to the charging terminal.

15. The control method according to claim 14, characterized in that: The on-off device includes a first type of on-off device; and controlling the on-off of the on-off device to adjust the number of the DCDC modules providing charging power to the charging terminal includes: The on / off of the first type of on / off device is controlled to adjust the number of the DCDC modules providing charging power to the charging terminal, wherein the first type of on / off device is connected between multiple DCDC modules and the charging terminal.

16. The control method according to claim 15, characterized in that: The DCDC module includes a first DC converter, a second DC converter and a switching device; the control method further includes: controlling the switching device to a first switching state so that the first DC converter and the second DC converter are in a parallel mode; Alternatively, the switching device is controlled to a second switching state, so that the first DC converter and the second DC converter are in a series mode.

17. The control method according to claim 16, characterized in that: The DCDC module includes a first DCDC module and a second DCDC module, and the first type of switching device includes a first switching circuit and a second switching circuit; and controlling the switching of the first type of switching device to adjust the number of the DCDC modules providing charging power to the charging terminal includes: controlling the first switch circuit to be in a closed state and the second switch circuit to be in an open state, and simultaneously controlling the switching device of the first DCDC module to be in a first switching state, so that the first DCDC module provides charging power to the charging terminal; Alternatively, the first switch circuit is controlled to be in an open state, the second switch circuit is controlled to be in a closed state, and the switching device of the second DCDC module is controlled to be in a first switching state, so that the second DCDC module provides charging power to the charging terminal; The first switch circuit is connected between the first DCDC module and the charging terminal; the second switch circuit is connected between the second DCDC module and the charging terminal.

18. The control method according to claim 17, characterized in that: The control method further includes: When a first preset condition is met, the first switch circuit and the second switch circuit are controlled to be in a closed state, and the switching device of the first DCDC module is controlled to be in the first switching state, and the switching device of the second DCDC module is controlled to be in the first switching state, so that the first DCDC module and the second DCDC module provide charging power to the charging terminal; The first preset condition includes: the charging current of the charging terminal is equal to the first preset current, the voltage change rate is equal to the first preset rate, and the duration is greater than the first preset time.

19. The control method according to claim 18, characterized in that: The control method further includes: When the charging voltage of the charging terminal reaches a first preset voltage, the first switch circuit is controlled to be in a closed state, the second switch circuit is controlled to be in an open state, and at the same time, the switching device of the second DCDC module is controlled to be in a second switching state, so that the first DCDC module provides charging power to the charging terminal.

20. The control method according to claim 19, characterized in that: After the switching device of the second DCDC module switches to the second switching state, the control method further includes: The first switch circuit is controlled to be in an open state and the second switch circuit is controlled to be in a closed state, so that the second DCDC module provides charging power to the charging terminal.

21. The control method according to claim 19, characterized in that: After the switching device of the second DCDC module switches to the second switching state, the control method further includes: The first switch circuit is controlled to be in an open state and the second switch circuit is controlled to be in a closed state, and at the same time, the switching device of the first DCDC module is controlled to be in a second switching state, so that the second DCDC module provides charging power to the charging terminal.

22. The control method according to claim 21, characterized in that: After the switching device of the first DCDC module switches to the second switching state, the control method further includes: The first switch circuit and the second switch circuit are controlled to be in a closed state, so that the first DCDC module and the second DCDC module provide charging power to the charging terminal.

23. The control method according to claim 22, characterized in that: The control method further includes: When the charging voltage of the charging terminal reaches the total voltage of the external device, the charging current of the charging terminal is adjusted to the maximum allowable charging current of the external device.

24. The control method according to any one of claims 18 to 22, characterized in that: The control method further includes: When the charging current of the charging terminal is less than or equal to the second preset current, the demand current of the external device is greater than or equal to the third preset current, and the duration is the second preset time, the charging current of the charging terminal is adjusted to the maximum allowable charging current of the external device, and the charging voltage of the charging terminal is adjusted to a second voltage value; wherein the third preset current is less than the first preset current, and the third preset current is greater than the second preset current.

25. The control method according to any one of claims 17 to 23, characterized in that: The on-off device further includes a second type of on-off device; and the control method further includes: controlling the second-type on-off device to be in a closed state, so that the two adjacent first DCDC modules provide charging power to the charging terminal; Alternatively, the second-type on-off device is controlled to be in an off state, so that one of the first DCDC modules provides charging power to the charging terminal; The second type of switching device is connected between two adjacent first DCDC modules.

26. The control method according to any one of claims 17 to 23, characterized in that: The on-off device further includes a second type of on-off device; and the control method further includes: controlling the second-type on-off device to be in a closed state, so that the two adjacent second DCDC modules provide charging power to the charging terminal; Alternatively, the second type of on-off device is controlled to be in an off state, so that one of the second DCDC modules provides charging power to the charging terminal; The second type of switching device is connected between two adjacent second DCDC modules.

27. The control method according to any one of claims 17 to 23, characterized in that: The switching device further includes a third type of switching device, and the charging terminal includes at least two charging plugs; the control method further includes: controlling the third type of on-off device to be in a closed state, so that one of the charging plugs receives charging power provided by the first DCDC module and the second DCDC module; Alternatively, the third type of on-off device is controlled to be in an off state, so that both charging plugs can receive the charging power provided by the first DCDC module and the second DCDC module; Wherein, the third type of on-off device is connected between two adjacent charging plugs.

28. A charging pile, characterized in that: The device comprises a charging terminal and a charging device according to any one of claims 1 to 13.

29. An electronic device, characterized in that: include: a memory configured to store instructions; and a processor configured to call the instructions from the memory and implement the control method of the charging device according to any one of claims 14 to 27 when executing the instructions.

30. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the control method of the charging device according to any one of claims 14 to 27 is executed on the computer.

31. A computer program product, characterized in that The computer program product includes computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the control method of the charging device according to any one of claims 14 to 27.

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