Charging method and energy storage charging equipment

Abstract

The embodiment of the present application provides a charging method and an energy storage charging device, wherein the charging method includes: in response to a charging request sent by a device to be charged, obtaining the remaining power of the energy storage device, and comparing the to-be-charged power of the device to be charged with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged, and obtaining a comparison result; in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply demand, determining the power to be allocated based on the to-be-charged power and the first power supply power; based on the second power supply power and the to-be-allocated power of each second charging module, determining at least one second charging module that meets the allocation condition as the target charging module; in response to the remaining power being less than a preset threshold, disconnecting the energy storage switch, and supplying power to the first charging module and the target charging module corresponding to the device to be charged through the power grid connected to the energy storage charging device. It can meet the charging needs of vehicles with different powers.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and are related to but not limited to a charging method and energy storage charging equipment. Background Art

[0002] In recent years, the world has faced major challenges in sustainable development, such as energy shortages, climate change and pollutant emissions. Therefore, countries have begun to pay extensive attention to the development of new energy vehicles represented by electric vehicles. However, the development of electric vehicles is also affected by a series of constraints, among which range anxiety is considered to be one of the main obstacles to the widespread acceptance of pure electric vehicles. Compared with the properties of traditional automobiles, electric vehicles have a higher dependence on charging systems.

[0003] However, different electric vehicles have different battery types and charging power. When using a charging pile with multiple charging guns to distribute power, the relevant technology usually divides the power supply of the power grid equally, resulting in insufficient power for some charging piles and excess power for some charging piles. This not only fails to meet the charging needs of different vehicles, but also leads to the problem of waste of resources. Summary of the invention

[0004] In order to solve the problems existing in the related technology, the embodiments of the present application provide a charging method and energy storage charging equipment, and multiple second charging modules are set up to supplement the power of the charging gun when the charging power is insufficient. It not only has a simple structure and can meet the charging needs of vehicles with different power, but also reduces the waste of resources.

[0005] In a first aspect, the present application provides a charging method, which is applied to a control unit of an energy storage charging device, wherein the energy storage charging device is connected to a plurality of charging guns; the energy storage charging device at least comprises an energy storage device connected to a DC bus, a plurality of first charging modules correspondingly connected to each charging gun, and a plurality of second charging modules connected to each charging gun, wherein any two of the plurality of first charging modules and the plurality of second charging modules are connected in parallel to the DC bus, and an energy storage switch is provided between the energy storage device and the DC bus; the charging method comprises: in response to a charging request sent by a device to be charged, obtaining the remaining power of the energy storage device, and charging the device to be charged The power to be charged is compared with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result; in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply demand, the power to be allocated is determined based on the power to be charged and the first power supply power; based on the second power supply power of each second charging module and the power to be allocated, at least one second charging module that meets the allocation condition is determined as the target charging module; in response to the remaining power being less than a preset threshold, the energy storage switch is disconnected, and the first charging module corresponding to the device to be charged and the target charging module are powered by the power grid connected to the energy storage charging device.

[0006] In the above embodiment, in addition to the first charging module corresponding to each charging gun in the energy storage charging device, multiple additional second charging modules connected in parallel with the first charging module are provided to supplement the power of the charging gun when the charging power of a certain charging gun is insufficient, which can not only meet the charging needs of vehicles with different power but also reduce the waste of resources; at the same time, the source of electric energy for charging the device to be charged is determined based on the state of the energy storage device, thereby reducing the problem of damage to the energy storage device caused by continuing to supply power when the power of the energy storage device is low.

[0007] In some embodiments, the second charging module is connected to the charging gun through a power switch; the power to be allocated is determined based on the power to be charged and the first power supply power, including: determining the difference between the power to be charged and the first power supply power as the power to be allocated; correspondingly, based on the second power supply power of each second charging module and the power to be allocated, at least one second charging module that meets the allocation conditions is determined as the target charging module, and the device to be charged is powered by the target charging module and the first charging module corresponding to the device to be charged, including: based on the second power supply power of each second charging module and the power to be allocated, among the multiple second charging modules, at least one second charging module whose sum of power supply power is greater than or equal to the power to be allocated and whose error is within a preset range is determined as the target charging module; closing the power switch between the target charging module and the charging gun connected to the device to be charged, so as to power the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

[0008] In the above embodiment, the error between the target charging module and the power to be allocated is taken into consideration, and the error is controlled within a preset range, which can reduce resource waste.

[0009] In some embodiments, the energy storage charging device also includes a first bidirectional inverter, the other side of which is connected to a power grid; the method also includes: in response to the remaining power being greater than or equal to the preset threshold, closing the energy storage switch, and supplying power to the first charging module and the target charging module corresponding to the device to be charged through the power grid and the energy storage device.

[0010] In the above embodiment, the source of electric energy for charging the device to be charged is determined based on the state of the energy storage device. When the power level of the energy storage device is low, the power grid continues to supply power, thereby avoiding the problem of damage to the energy storage device caused by the energy storage device continuing to supply power when the power level is low.

[0011] In some embodiments, the DC bus of the energy storage charging device includes a first DC bus and a second DC bus, and the first DC bus is connected to the second DC bus through a bus switch; the second DC bus is respectively connected to each charging gun and a second bidirectional inverter, and a control switch is arranged between each charging gun and the second DC bus; the method further includes: in response to a power supply request of the device to be powered, determining whether the energy storage charging device is connected to the device to be charged; in response to the energy storage charging device being connected to the device to be powered, closing the control switch and the bus switch corresponding to the charging gun connected to the device to be powered, so as to power the device to be powered through the device to be powered; in response to the energy storage charging device not being connected to the device to be powered, closing the control switch, the bus switch and the energy storage switch corresponding to the charging gun connected to the device to be powered, so as to power the energy storage device through the device to be powered, and / or, powering the power grid through the device to be powered and the second bidirectional inverter.

[0012] In the above embodiment, the electric vehicle can be used as a power source to supply power to the power grid when charging is not required. During the peak hours of the power grid, the electric vehicle can be used as a distributed energy storage unit to provide the necessary power support for the power grid, which helps to relieve the pressure on the power grid and thus improve the overall energy utilization efficiency. The battery capacity of electric vehicles is large and charges quickly. As a medium for energy storage and release, it can more effectively balance the supply and demand of electricity and reduce energy waste. At the same time, for electric vehicle owners, supplying power to the power grid can obtain certain economic compensation and reduce the cost of using the car.

[0013] In some embodiments, a selection switch is provided between each first charging module and the DC bus; the closing of the control switch and the bus switch corresponding to the charging gun connected to the device to be powered, and the power supply to the device to be powered through the device to be powered, includes: closing the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the selection switch corresponding to the charging gun connected to the device to be powered, and the power supply to the device to be charged through the device to be powered. In the above embodiments, the electric vehicle can be used as a power source to supply power to the power grid when charging is not required. During the peak hours of the power grid, electric vehicles can be used as distributed energy storage units to provide necessary power support to the power grid, which helps to relieve the pressure on the power grid and thus improve the overall energy utilization efficiency. The battery capacity of electric vehicles is large and the charging speed is fast. As a medium for energy storage and release, it can more effectively balance the supply and demand of electricity and reduce energy waste. At the same time, for electric vehicle owners, supplying power to the power grid can obtain certain economic compensation and reduce the cost of using the vehicle.

[0014] In some embodiments, the method further includes: in response to the power supply request, determining whether the energy storage charging device is connected to the device to be powered that is being powered; in response to the energy storage charging device being connected to the device to be powered that is being powered, obtaining the power supply end time of the device to be powered that is being powered, and sending the power supply end time to the device to be powered that issued the power supply request.

[0015] In the above embodiment, the energy storage charging device is restricted to only one vehicle feeding the energy storage device or the power grid, thereby ensuring the stability of power input and reducing the safety risks in the power transmission process.

[0016] In a second aspect, an embodiment of the present application provides an energy storage charging device, characterized in that the energy storage charging device includes: an energy storage device, connected to a DC bus of the energy storage charging device, an energy storage switch is provided between the energy storage device and the DC bus, and the energy storage device is used to store electric energy; a plurality of first charging modules, each first charging module is connected to a corresponding charging gun, wherein the energy storage charging device is connected to a plurality of charging guns, and the charging gun is used to connect to a device to be charged; a plurality of second charging modules, each second charging module is connected to each charging gun, and the plurality of first charging modules and any two of the plurality of second charging modules are connected in parallel to the DC bus; a control unit, used to respond to a charging request sent by the device to be charged, obtain the energy storage device, The remaining power of the device is measured, and the charging power of the device to be charged is compared with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result; in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply demand, the power to be allocated is determined based on the power to be charged and the first power supply power; based on the second power supply power of each second charging module and the power to be allocated, at least one second charging module that meets the allocation condition is determined as the target charging module; in response to the remaining power being less than a preset threshold, the energy storage switch is disconnected, and the first charging module corresponding to the device to be charged and the target charging module are powered by the power grid connected to the energy storage charging device.

[0017] In the above embodiment, in addition to the first charging module corresponding to each charging gun, additional multiple second charging modules are provided in the energy storage charging device to supplement the power of the charging gun when the charging power of a certain charging gun is insufficient, thereby being able to meet the charging needs of vehicles with different power and reducing the waste of resources; at the same time, the source of electric energy for charging the device to be charged is determined based on the state of the energy storage device, thereby reducing the problem of continued power supply when the power of the energy storage device is low, resulting in damage to the energy storage device.

[0018] In some embodiments, the energy storage charging device also includes a power switch between the second charging module and the charging gun; the control unit is also used to determine the difference between the power to be charged and the first power supply as the power to be allocated; the control unit is also used to determine, based on the second power supply power of each second charging module and the power to be allocated, at least one second charging module whose sum of power supply power is not less than the power to be allocated and whose error is within a preset range as a target charging module among the multiple second charging modules; the control unit is also used to close the power switch between the target charging module and the charging gun connected to the device to be charged, so as to power the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

[0019] In the above embodiment, the error between the target charging module and the power to be allocated is taken into consideration, and the error is controlled within a preset range, which can reduce resource waste.

[0020] In some embodiments, the energy storage charging device also includes a first bidirectional inverter; the first bidirectional inverter is connected to the DC bus and the power grid, respectively, and is used for conversion between AC and DC; the control unit is also used to close the energy storage switch in response to the remaining power being greater than or equal to the preset threshold, and to supply power to the first charging module and the target charging module corresponding to the device to be charged through the power grid and the energy storage device.

[0021] In the above embodiment, the source of electric energy for charging the device to be charged is determined based on the state of the energy storage device. When the power level of the energy storage device is low, the power grid continues to supply power, thereby avoiding the problem of damage to the energy storage device caused by the energy storage device continuing to supply power when the power level is low.

[0022] In some embodiments, the DC bus of the energy storage charging device includes a first DC bus and a second DC bus, the first DC bus and the second DC bus are connected through a bus switch, and a control switch is provided between each charging gun and the second DC bus; the energy storage charging device also includes a second bidirectional inverter; the second bidirectional inverter is provided between the second DC bus and the power grid; the control unit is also used to determine whether the energy storage charging device is connected to the device to be charged in response to a power supply request of the device to be powered; the control unit is also used to close the control switch and the bus switch corresponding to the charging gun connected to the device to be powered in response to the energy storage charging device being connected to the device to be powered, so as to power the device to be powered through the device to be powered; the control unit is also used to close the control switch, the bus switch and the energy storage switch corresponding to the charging gun connected to the device to be powered in response to the energy storage charging device not being connected to the device to be charged, so as to power the energy storage device through the device to be powered, and / or, power the power grid through the device to be powered and the second bidirectional inverter.

[0023] In the above embodiment, the electric vehicle can be used as a power source to supply power to the power grid when charging is not required. During the peak hours of the power grid, the electric vehicle can be used as a distributed energy storage unit to provide the necessary power support for the power grid, which helps to relieve the pressure on the power grid and thus improve the overall energy utilization efficiency. The battery capacity of electric vehicles is large and charges quickly. As a medium for energy storage and release, it can more effectively balance the supply and demand of electricity and reduce energy waste. At the same time, for electric vehicle owners, supplying power to the power grid can obtain certain economic compensation and reduce the cost of using the car.

[0024] In some embodiments, the rated power of the first bidirectional inverter and the second bidirectional inverter is less than a first preset value, and the sum of the power supply powers of multiple first charging modules and multiple second charging modules is greater than a second preset value; wherein the second preset value is greater than the first preset value.

[0025] In the above embodiment, the rated power of the first bidirectional inverter and the second bidirectional inverter enables the energy storage charging device to achieve low power input, without the need to configure an external transformer for the energy storage charging device or to expand the transformer capacity, thereby reducing the cost of the energy storage charging device.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 1 ;

[0028] Figure 2 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 1 ;

[0029] Figure 3 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 2 ;

[0030] Figure 4 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 3 ;

[0031] Figure 5 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 2 ;

[0032] Figure 6 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 4 ;

[0033] Figure 7 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 3 ;

[0034] Figure 8 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 5 ;

[0035] Fig. 9 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 6 ;

[0036] Fig.10 It is a schematic diagram of the architecture of the storage-charging integrated machine provided in an embodiment of the present application;

[0037] Fig.11 It is a schematic diagram of the power distribution process of multiple charging guns in the storage-charging integrated machine provided in the embodiment of the present application;

[0038] Fig.12 is a schematic diagram of the structure of a power distribution unit provided in an embodiment of the present application;

[0039] Fig.13 It is a schematic diagram of the power distribution process of the energy storage module provided in the embodiment of the present application;

[0040] Fig.14 It is a flow chart of the V to G function in the storage and charging integrated machine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0042] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict. Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as those commonly understood by those skilled in the art of the technical field of the embodiments of the present application. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0043] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. In the embodiment of the present application, the battery involved may be a battery cell, also known as a battery cell. A battery cell refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, which can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be used to activate the active material by charging after the battery cell is discharged. The battery cell may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiment of the present application is not limited to this.

[0044] In the embodiments of the present application, the battery cell is the core component of the battery pack. A battery pack usually contains multiple battery cells, which are combined together to provide the required power capacity and voltage. The components of the battery pack include at least: battery cells, battery management system (BMS, Battery Management System), casing, connecting harness, connector and interface, etc. These components work together to combine the battery cells into a fully functional battery pack for various application scenarios. For example, the battery pack can be applied to electric vehicles, energy storage systems, portable electrical equipment, solar energy systems, wind energy systems, emergency backup power supplies, power tools or electric bicycles, etc. The embodiments of the present application do not make any restrictions on this, and the specific selection can be made according to the actual application scenario.

[0045] In the embodiments of the present application, the battery cell may refer to a battery cell of any shape, such as a square battery cell, a round battery cell, etc. And the battery cell usually refers to a battery cell, which is one of the basic units that constitute the battery. The battery cell is the core component of the battery, responsible for storing and releasing electrical energy. The battery cell may be: a lithium-ion battery cell (Li-ion Cell), a lithium polymer battery cell (Li-polymer Cell), a nickel-metal hydride battery cell (NiMH Cell), etc. The embodiments of the present application do not impose any restrictions on the type of battery cell, and the specific type can be selected according to the actual application scenario.

[0046] It should be noted that the battery pack can use different types of battery cells, such as lithium-ion batteries, nickel-metal hydride batteries, lithium polymer batteries, etc., depending on the needs and performance requirements of the actual application.

[0047] In the embodiment of the present application, the battery may also be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0048] At present, there are many types of new energy vehicles on the market, and the update and iteration time is relatively short. Different electric vehicles have different battery types and charging powers, and the charging power provided by charging piles is single, resulting in the fact that it is rare to find charging piles with matching power when charging cars outside. In addition, due to the large number of new energy vehicles, it is difficult to find idle charging piles outside. The relevant technology uses multiple charging guns on a charging pile to solve the problem of difficulty in charging outside. At the same time, when using a charging pile with multiple charging guns for power distribution, the power supply power of the power grid is usually evenly divided. However, when charging cars of different powers through evenly divided charging guns, some charging piles will have insufficient power and some charging piles will have excess power, which not only cannot meet the charging needs of different vehicles, but also leads to resource waste.

[0049] In order to alleviate the problems existing in the related technologies, the applicant has found that in addition to the charging module corresponding to each charging gun (i.e., the bidirectional DC / DC of the charging device) in the energy storage charging equipment, multiple additional charging modules can also be provided to supplement the power of the charging gun when the charging power of a certain charging gun is insufficient. This can not only meet the charging needs of vehicles with different power but also reduce the waste of resources.

[0050] Based on the above considerations, the applicant, after in-depth research, set up multiple second charging modules in the energy storage charging device, and in response to the charging request sent by the device to be charged, compared the charging power of the device to be charged with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged. If the first charging module corresponding to the device to be charged does not meet the power supply requirement, the power to be allocated is determined based on the charging power to be charged and the first power supply power. Based on the second power supply power and the power to be allocated of each second charging module, at least one second charging module that meets the allocation conditions is determined as the target charging module, and the device to be charged is powered by the target charging module and the first charging module corresponding to the device to be charged.

[0051] In this way, in the embodiment of the present application, in addition to the first charging module corresponding to each charging gun in the energy storage charging device, multiple additional second charging modules are provided to supplement the power of the charging gun when the charging power of a certain charging gun is insufficient. This can not only meet the charging needs of vehicles with different power but also reduce the waste of resources.

[0052] The device to be charged in the charging method disclosed in the embodiment of the present application may be, but is not limited to, electrical equipment such as vehicles, battery vehicles, and electric wheelchairs.

[0053] The embodiment of the present application provides a charging method, the execution subject is an energy storage charging device, the energy storage charging device can be an integrated storage and charging machine, the energy storage charging device and the device to be charged can communicate through wireless or controller area network (CAN) bus, the wireless communication between the energy storage charging device and the car can adopt a variety of wireless communication protocols, including Bluetooth, Wi-Fi and mobile communication protocols (such as 4G / 5G), etc. to obtain information such as the type, capacity and maximum charging power of the battery of the device to be charged. When the energy storage charging device communicates with the device to be charged through the CAN bus, before charging starts, the device to be charged establishes a connection with the energy storage charging device based on the charging gun, and the energy storage charging device can obtain information such as the type, capacity and maximum charging power of the battery of the device to be charged, and the energy storage charging device adjusts the power of the charging gun based on the above information.

[0054] During the charging process, the energy storage charging device can regularly collect the charging parameters of the battery of the device to be charged (such as voltage, current, SOC and other information) to adjust the charging parameters. After charging is completed, the energy storage charging device sends a charging completion message to the device to be charged to remind it to unplug the charging gun to complete charging.

[0055] Below, the technical solution of the present application will be described in detail with reference to the accompanying drawings, taking the control unit of the energy storage charging device as an example of the execution body.

[0056] In some embodiments, Figure 1 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 1 ,like Figure 1 As shown, the energy storage charging device 100 is connected to multiple charging guns 101, and includes at least a control unit (not shown in the figure), multiple first charging modules 102 correspondingly connected to each charging gun, and multiple second charging modules 103 connected to each charging gun, the rated power of different first charging modules is the same or different, the rated power of different second charging modules is the same or different, and the number of multiple first charging modules 102 is the same or different from the number of multiple second charging modules 103. The energy storage charging device 100 also includes an energy storage device 105 connected to the DC bus 104, and an energy storage switch 106 is provided between the energy storage device 105 and the DC bus 104. Any two charging modules among the multiple first charging modules 102 and the multiple second charging modules 103 are connected in parallel to the DC bus 104.

[0057] Here, the control unit and the hardware of the energy storage charging device such as the first charging module and the second charging module can communicate through the CAN bus to realize real-time data transmission and control between the control unit and other modules. Here, the energy storage charging device 100 provided in the embodiment of the present application can be connected to any available charging gun, and there is no restriction on the type of charging gun. The energy storage charging device 100 may also include multiple charging guns.

[0058] based on Figure 1 , Figure 2 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 1 ,like Figure 2 As shown, the charging method provided in the embodiment of the present application can be implemented through steps S201 to S204:

[0059] Step S201, in response to a charging request sent by a device to be charged, obtaining the remaining power of the energy storage device, and comparing the charging power of the device to be charged with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result.

[0060] In some embodiments, the charging request may be an instruction input or selected by the user based on the central control screen of the vehicle, including but not limited to selection operation, confirmation operation, page turning operation, scrolling operation, etc. on the central control screen. For example, the user may select the charging component on the central control screen of the vehicle and send a charging request to the energy storage charging device through wireless communication.

[0061] In some embodiments, the charging request may also be a charging request issued when the device to be charged is connected to a charging gun of the energy storage charging device, that is, when the handshake is successful. The charging request includes at least information such as the type of battery in the device to be charged and the charging power.

[0062] In some embodiments, the first charging module may refer to a bidirectional direct current converter (DC / DC, Direct Current to Direct Current), which is connected to the power grid and the battery of the energy storage charging device through a DC bus to achieve bidirectional transmission of electric energy. Here, the rated powers of multiple first charging modules in the energy storage charging device may be the same or different. The same means that each first charging module provides the same power to the corresponding charging gun, that is, multiple first charging modules divide the power of the energy storage module or the power grid equally. The rated powers of multiple first charging modules are different, that is, each first charging module provides different powers to the corresponding charging gun. At this time, the charging gun of the energy storage charging device may include a super charging gun, a fast charging gun and a slow charging gun, and different charging guns can provide different power supplies.

[0063] In the embodiment of the present application, the energy storage device in the energy storage charging device may refer to the battery of the energy storage charging device, which is used to store electrical energy and release it when needed. The power grid refers to a system composed of transmission lines, substations, distribution stations and user wiring, etc., which is used to transmit electrical energy. When the energy storage charging device supplies power to the device to be charged, it can be powered by at least one of the energy storage device and the power grid.

[0064] In an embodiment of the present application, after receiving a charging request from a device to be charged, the energy storage charging device first determines the remaining power (SOC, State of Charge) of the energy storage device of the energy storage charging device itself. When the remaining power is sufficient, power can be supplied by the energy storage device. When the power is insufficient, power can be supplied by the power grid.

[0065] After receiving the charging request from the device to be charged, the control unit of the energy storage charging device can also determine the charging power of the device to be charged, that is, the power of the device to be charged when charging. In the case where the powers provided by each first charging module are different, it can be determined whether the power of the charging gun currently connected to the device to be charged matches the power to be charged according to the power to be charged of the device to be charged. For example, the charging power of the charging gun currently connected to the device to be charged is 70 kilowatts (kw), and the power to be charged of the device to be charged is 150kw, and the energy storage charging device also has a 150kw charging gun, and the charging gun is idle. At this time, the user can be prompted to replace it on the display interface of the energy storage charging device, and the replacement information can also be sent to the device to be charged.

[0066] Here, in the case where the powers provided by each first charging module are different, if there is a charging gun that matches the charging power of the device to be charged, the device to be charged can be charged through the charging gun; if there is no charging gun that matches the power to be charged (the power supplied is greater than or equal to the power to be charged), the power supplied by each first charging module can be compared with the power to be charged, and the charging gun with the power supplied closest to the power to be charged can be displayed on the display interface of the energy storage charging device, prompting the user to switch to the charging gun. The user can also choose not to change and only charge through the currently connected charging gun.

[0067] In some embodiments, when the power provided by each first charging module is the same, the charging power of the device to be charged is compared with the first power supply power of the first charging module corresponding to the charging gun currently connected to the device to be charged, and a comparison result can be obtained. Here, the comparison result can refer to whether the currently connected charging gun meets the power supply requirement, that is, whether the power supply power of the first charging module corresponding to the charging gun is greater than or equal to the charging power of the device to be charged.

[0068] Step S202: in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply requirement, determine the power to be allocated based on the power to be charged and the first power supply.

[0069] In some embodiments, if the comparison result indicates that the first charging module corresponding to the charging gun currently connected to the device to be charged does not meet the power supply requirements, that is, the first power supply power of the first charging module is less than the charging power required by the device to be charged, then the power to be allocated can be calculated, that is, how much power the charging module still lacks.

[0070] Here, the power to be allocated may be the difference between the first power supply power of the first charging module corresponding to the device to be charged and the power to be charged.

[0071] Step S203: Based on the second power supply power of each second charging module and the power to be allocated, at least one second charging module that meets the allocation condition is determined as a target charging module.

[0072] In an embodiment of the present application, the second charging module may also be a bidirectional DC / DC module, which is connected to the power grid and the battery of the energy storage charging device through a DC bus, and is used to provide power to the charging gun when the power supply of the charging gun is insufficient.

[0073] Here, the second power supply power of each second charging module may be the same or different.

[0074] In an embodiment of the present application, after determining the power to be allocated, the target charging module for providing charging power to the charging gun connected to the device to be charged is determined according to the power supply power of each second charging module. Here, at least one second charging module whose sum of second power supply power is greater than the power to be allocated can be determined as the target charging module. For example, if the power to be allocated is 120kw, and the second power supply powers of multiple second charging modules are 20kw, 40kw, 60kw and 80kw respectively, then the two second charging modules corresponding to 40kw and 80kw can be determined as the target charging modules, and the device to be charged can be powered by the target charging module and the first charging module corresponding to the device to be charged.

[0075] Step S204: in response to the remaining power being less than a preset threshold, disconnecting the energy storage switch, and supplying power to the first charging module and the target charging module corresponding to the device to be charged through the power grid to which the energy storage charging device is connected.

[0076] In some embodiments, the preset threshold may be 5%, that is, when the remaining power of the energy storage device is less than 5%, based on Figure 1 , disconnect the energy storage switch 106 between the DC bus 104 and the energy storage device 105, and supply power to the first charging module and the target charging module corresponding to the device to be charged through the power grid connected to the energy storage charging device, that is, provide power supply power.

[0077] In the embodiment of the present application, since multiple first charging modules and multiple first charging modules are connected in parallel with each other, when the power of the first charging module corresponding to the charging gun connected to the device to be charged is insufficient, the power supply current of the charging gun connected to the device to be charged is increased through the parallel target charging module, thereby increasing the power supply power of the charging gun connected to the device to be charged to meet the charging power requirement of the device to be charged and improve the charging efficiency; at the same time, the source of electric energy for charging the device to be charged is determined based on the state of the energy storage device, thereby reducing the problem of continuing to supply power when the energy storage device is low in power, causing damage to the energy storage device.

[0078] Here, since each second charging module is connected to each charging gun, after determining the target charging module, the control unit can control the target charging module to provide power to the designated charging gun. Figure 1 As shown, a switch can be set between the second charging module and the charging gun, and the control is performed by the switch. Alternatively, a switch can be set inside the second charging module and directly controlled by the control unit. Alternatively, any feasible control scheme can be used, and this application does not limit it.

[0079] In the embodiment of the present application, in addition to the first charging module corresponding to each charging gun in the energy storage charging device, multiple additional second charging modules connected in parallel with the first charging module are provided to supplement the power of the charging gun when the charging power of a certain charging gun is insufficient. This can not only meet the charging needs of vehicles with different power but also reduce the waste of resources.

[0080] In some embodiments, Figure 3 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 2 ,like Figure 3 As shown, the second charging module 103 is connected to the charging gun via a power switch 301, and one charging gun is connected to each second charging module based on the power switch. Figure 3 , step S202 can be implemented by step S2021:

[0081] Step S2021: determine the difference between the power to be charged and the first power supply as the power to be allocated.

[0082] In the embodiment of the present application, the power to be allocated is the difference between the first power supply power of the first charging module corresponding to the device to be charged and the power to be charged.

[0083] Correspondingly, step S203 can be implemented by steps S2031 and S2032:

[0084] Step S2031: Based on the second power supply power of each second charging module and the power to be allocated, among the multiple second charging modules, at least one second charging module whose sum of power supply power is greater than or equal to the power to be allocated and whose error is within a preset range is determined as a target charging module.

[0085] In an embodiment of the present application, when determining the target charging module, since different types of vehicles use different batteries and have different powers to be charged, vehicles on the market have a variety of powers to be charged. The embodiment of the present application meets the charging needs of vehicles with different powers through the second charging module. However, since the number of second charging modules is limited, the power provided by the target charging module will not be exactly the same as the power to be matched. In order to reduce resource waste, the error between the power provided by the target charging module and the power to be matched needs to be controlled within a preset range, which may be 5kw.

[0086] In some embodiments, at least one second charging module with the smallest error between the sum of the power to be allocated and the power supplied can also be determined as the target charging module. For example, the power to be allocated is 97kw, and the second power supply powers of multiple second charging modules are 3kw, 5kw, 10kw, 20kw, 30kw, 40kw, 60kw and 80kw respectively. At this time, the two second charging modules corresponding to 20kw and 80kw can be determined as the target charging modules, and the four second charging modules corresponding to 3kw, 5kw, 30kw and 60kw can also be determined as the target charging modules. However, the error of the first target charging module is 3kw, and the error of the second target charging module is 1kw. In order to reduce resource waste, the second target charging module is determined as the target charging module for powering the device to be charged.

[0087] In some embodiments, the energy storage charging device may currently be connected to a device to be charged and is being charged. Therefore, some of the multiple second charging modules may be supplying power to other charging guns. Therefore, when selecting a target charging module, at least one second charging module with the smallest error can be selected from the idle second charging modules.

[0088] Step S2032: close the power switch between the target charging module and the charging gun connected to the device to be charged, so as to supply power to the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

[0089] In the embodiment of the present application, after the target charging module is determined, the power switch between the target charging module and the charging gun connected to the device to be charged is turned off. Figure 3 , the multiple charging guns 101 include a target charging gun connected to the device to be charged. If the target charging gun is 101-1, the target charging gun 101-1 is connected to the target first charging module 102-1 among the multiple first charging modules 102, and the target charging module determined among the multiple second charging modules 103 is 103-1. At this time, the first power supply switch 301-1 among the multiple power supply switches 301 is closed to supply power to the device to be charged through the target charging module 103-1 and the target first charging module 102-1.

[0090] In the embodiment of the present application, the error between the target charging module and the power to be allocated is taken into consideration, and the error is controlled within a preset range, which can reduce resource waste.

[0091] With the development of new energy generation technology, electric equipment can transmit electric energy to charging devices, and then transmit electric energy to energy storage systems or power grids through charging devices, so as to achieve electric energy arbitrage and increase user income. Electric equipment can provide electric energy in vehicle-to-vehicle, vehicle-to-grid (V to G, Vehicle to Grid) or vehicle-to-energy storage device (V to B, Vehicle to Battery). After receiving the electric energy transmitted by the vehicle, the energy storage charging device can transmit the received electric energy to other devices to be charged connected to the energy storage charging device; it can also transmit the received electric energy to the energy storage device to realize the charging operation of the energy storage device; it can also transmit the received electric energy to the power grid for use by other electric equipment connected to the power grid.

[0092] Based on the above embodiments, Figure 4 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 3 ,like Figure 4 As shown, the energy storage charging device further includes a first bidirectional inverter 401 connected to the DC bus 104, and the other side of the first bidirectional inverter 401 is connected to the power grid. Figure 4 , Figure 5 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 2 ,like Figure 5 As shown, the charging method provided in the embodiment of the present application may further include step S501:

[0093] Step S501: In response to the remaining power being greater than or equal to the preset threshold, the energy storage switch is closed, and power is supplied to the first charging module corresponding to the device to be charged and the target through the power grid and the energy storage device.

[0094] Here, the power grid converts alternating current through a first bidirectional inverter. In an embodiment of the present application, the rated power of the first bidirectional inverter is less than or equal to 150 kW, so that the energy storage charging device can achieve low-power input. There is no need to configure an external transformer for the energy storage charging device or to expand the transformer capacity, thereby reducing the cost of the energy storage charging device.

[0095] In an embodiment of the present application, when the remaining power of the energy storage device is greater than 5%, the energy storage switch can be closed to provide power supply to the first charging module corresponding to the device to be charged and the target charging module through the power grid and the energy storage device.

[0096] The embodiment of the present application determines the source of electric energy for charging the device to be charged based on the state of the energy storage device. When the power of the energy storage device is low, the power grid continues to supply power, thereby avoiding the problem of damage to the energy storage device caused by the energy storage device continuing to supply power when the power is low.

[0097] Based on the above embodiments, Figure 6 This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 4 ,like Figure 6 As shown, the DC bus 104 of the energy storage charging device includes a first DC bus 1041 and a second DC bus 1042, and the first DC bus 1041 and the second DC bus 1042 are connected through a bus switch 601; the second DC bus 1042 is respectively connected to each charging gun 101 and the second bidirectional inverter 602, and a control switch 603 is provided between each charging gun 101 and the second DC bus 1042. Based on Figure 6 , Figure 7 This is an optional flow diagram of the charging method provided in the embodiment of the present application. Figure 3 ,like Figure 7 As shown, the charging method provided in the embodiment of the present application may also include steps S701 to S703:

[0098] Step S701: In response to a power supply request from a device to be powered, determine whether the energy storage charging device is connected to the device to be charged.

[0099] In some embodiments, the device to be powered refers to a vehicle that supplies power to the energy storage charging device, and the power supply request refers to a power supply request including at least a power supply current and a power supply power, which is sent by the power supply vehicle to the energy storage charging device through wireless communication or by connecting a charging gun, that is, a V to G request of the vehicle. After receiving the power supply request, the energy storage charging device confirms whether to receive power supply from the device to be powered based on the power supply current and the power supply power in the power supply request.

[0100] In the embodiment of the present application, when receiving the power supply request of the device to be powered, it is confirmed whether the energy storage charging device is connected to the device to be charged. If the device to be charged is connected, the power of the device to be powered can be provided to the device to be charged. If the device to be charged is not connected, the power can be transmitted to the energy storage device or the power grid of the energy storage charging device.

[0101] Step S702: In response to the energy storage charging device being connected to the device to be charged, closing the control switch corresponding to the charging gun connected to the device to be powered and the bus switch, so as to supply power to the device to be charged through the device to be powered.

[0102] In some embodiments, Figure 8This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 5 ,like Figure 8 As shown, each first charging module 102 is connected to the DC bus (i.e. Figure 8 A selection switch 801 is provided between the first DC bus 1041 in the embodiment. Correspondingly, step S702 can be implemented by step S7021:

[0103] Step S7021: close the control switch corresponding to the charging gun connected to the device to be powered, the bus switch, and the selection switch corresponding to the charging gun connected to the device to be powered, and power the device to be powered through the device to be powered.

[0104] In some embodiments, if the energy storage charging device is connected to a device to be charged, at this time, the device to be charged connected to the energy storage charging device is powered by the device to be powered. At this time, the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the selection switch corresponding to the charging gun connected to the device to be charged are closed to realize the power supply path, for example, based on Figure 8 , the charging gun connected to the device to be powered is the charging gun to be powered 101-2, and the charging gun connected to the device to be charged is the ready charging gun 101-n. At this time, the control switch corresponding to the charging gun to be powered 101-2 connected to the device to be powered (such as the power supply control switch 603-2 in the figure), the bus switch 601 and the selection switch corresponding to the ready charging gun 101-n connected to the device to be charged (such as the charging selection switch 801-n in the figure) are closed to enable the device to be powered to supply power to the device to be charged.

[0105] Step S703, in response to the energy storage charging device not being connected to the device to be charged, close the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the energy storage switch, so as to power the energy storage device through the device to be powered, and / or power the power grid through the device to be powered and the second bidirectional inverter.

[0106] In the embodiment of the present application, if the energy storage charging device is not connected to the device to be charged, then the energy storage device or the power grid of the energy storage charging device is powered by the device to be powered. Figure 8 , the power supply control switch 603-2, the bus switch 601 and the energy storage switch 106 corresponding to the charging gun 101-2 to be powered connected to the device to be powered can be closed to power the energy storage device through the device to be powered, or the power grid is powered by the device to be powered and the second bidirectional inverter 602, or the power supply control switch 603-2, the bus switch 601 and the energy storage switch 106 corresponding to the charging gun 101-2 to be powered connected to the device to be powered can be closed to power the energy storage device and the power grid at the same time through the device to be powered and the second bidirectional inverter 602.

[0107] The embodiments of the present application enable electric vehicles to be used as a power source to supply power to the power grid when charging is not required and there is sufficient electricity. During peak hours of the power grid, electric vehicles can be used as distributed energy storage units to provide necessary power support to the power grid, which helps to relieve the pressure on the power grid and thus improve the overall energy utilization efficiency. At the same time, electric vehicles have large battery capacity and fast charging. As a medium for energy storage and release, they can more effectively balance the supply and demand of electricity and reduce energy waste. At the same time, for electric vehicle owners, supplying power to the power grid can obtain certain economic compensation and reduce the cost of using the vehicle.

[0108] In some embodiments, the charging method provided in the embodiments of the present application may further include step S11 and step S12:

[0109] Step S11: In response to the power supply request, determine whether the energy storage charging device is connected to the device to be powered that is currently being powered.

[0110] In the embodiment of the present application, in order to ensure the system stability of the energy storage charging device, it is necessary to accurately control the power input received from the electric vehicle. Processing V to G requests from multiple vehicles at the same time may cause instability in the power input and affect the performance and life of the energy storage charging device. Therefore, the energy storage charging device can only receive input from one device to be powered at a time to reduce safety risks during power transmission, such as overcurrent, overvoltage and other problems.

[0111] Therefore, when the embodiment of the present application receives a V to G request from the device to be powered, it will first determine whether the current energy storage charging device is supplying power to the device to be powered.

[0112] Step S12: in response to the energy storage charging device being connected to a device to be powered that is currently powered, obtaining a power supply end time for the device to be powered that is currently powered, and sending the power supply end time to the device to be powered that issued the power supply request.

[0113] Here, when the energy storage charging device is connected to a device that is currently being powered and is waiting to be powered, a data acquisition request can be sent to the device that is currently being powered and is waiting to be powered to obtain the remaining power of the vehicle, so as to estimate the end time of power supply to the device that is currently being powered and is waiting to be powered, and the end time of power supply is sent to the device that is currently being powered and is waiting to be powered that issues the power supply request, so that the owner of the device that is currently being powered and is waiting to be powered who sends the power supply request can determine whether to wait until the vehicle's power supply ends before supplying power.

[0114] The embodiment of the present application limits the energy storage charging device to only one vehicle for V to G, thereby ensuring the stability of power input and reducing safety risks during power transmission.

[0115] Fig. 9This is an optional structural diagram of the energy storage charging device provided in the embodiment of the present application. Figure 6 ,like Fig. 9 As shown, the embodiment of the present application provides an energy storage charging device, the energy storage charging device 100 can be connected to multiple charging guns 101, the energy storage charging device 100 at least includes multiple first charging modules 102, multiple second charging modules 103 and a control unit (not shown in the figure), and the control unit is connected to each module in the energy storage charging device 100 by wire or wireless to achieve real-time communication and data transmission. The energy storage charging device 100 also includes an energy storage device 105 connected to a DC bus (including a first DC bus 1041 and a second DC bus 1042, and the first DC bus 1041 and the second DC bus 1042 are connected through a bus switch 601), and an energy storage switch 106 is provided between the energy storage device 105 and the DC bus (i.e., the first DC bus 1041), and the energy storage device 105 is used to store electrical energy.

[0116] The charging gun is used to connect the device to be charged or the device to be powered, each first charging module is connected to a corresponding charging gun, and each second charging module is connected to each charging gun.

[0117] The control unit is used to respond to a charging request sent by the device to be charged, obtain the remaining power of the energy storage device, and compare the charging power of the device to be charged with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result; in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply demand, determine the power to be allocated based on the charging power to be charged and the first power supply power; based on the second power supply power and the power to be allocated of each second charging module, determine at least one second charging module that meets the allocation condition as the target charging module; in response to the remaining power being less than a preset threshold, disconnect the energy storage switch, and power the first charging module corresponding to the device to be charged and the target charging module through the power grid connected to the energy storage charging device.

[0118] In some embodiments, the energy storage charging device 100 further includes a power switch 301 between the second charging module 103 and the charging gun 101 , each charging gun is connected to all the second modules, and when there are n charging guns and m second charging modules, there are n*m ​​power switches.

[0119] Correspondingly, the control unit is also used to control the unit, and is also used to determine the difference between the power to be charged and the first power supply as the power to be allocated; based on the second power supply power and the power to be allocated of each second charging module, among the multiple second charging modules, at least one second charging module whose sum of power supply power is not less than the power to be allocated and whose error is within a preset range is determined as the target charging module; close the power supply switch between the target charging module and the charging gun connected to the device to be charged, so as to power the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

[0120] In some embodiments, the energy storage charging device 100 also includes a first bidirectional inverter 401; the energy storage device 105 is connected to the DC bus (i.e., the first DC bus 1041) through the energy storage switch 106 for storing electrical energy; the first bidirectional inverter 401 is respectively connected to the DC bus (i.e., the first DC bus 1041) and the power grid for conversion between AC and DC.

[0121] The control unit is also used to close the energy storage switch in response to the remaining power being greater than or equal to the preset threshold, and to supply power to the first charging module and the target charging module corresponding to the device to be charged through the power grid and the energy storage device.

[0122] In some embodiments, a control switch 603 is provided between each charging gun and the second DC bus 1042 , and the energy storage charging device 100 further includes a second bidirectional inverter 602 , which is respectively connected to the second DC bus 1042 and the grid.

[0123] The control unit is also used to determine whether the energy storage charging device is connected to the device to be charged in response to a power supply request from the device to be powered; in response to the energy storage charging device being connected to the device to be powered, close the control switch and bus switch corresponding to the charging gun connected to the device to be powered, so as to power the device to be charged through the device to be powered; in response to the energy storage charging device not being connected to the device to be powered, close the control switch, bus switch and energy storage switch corresponding to the charging gun connected to the device to be powered, so as to power the energy storage device through the device to be powered, and / or, power the grid through the device to be powered and the second bidirectional inverter.

[0124] In some embodiments, a selection switch 801 is provided between each first charging module 102 and the DC bus (ie, the first DC bus 1041 ), and the number of the selection switches 801 is the same as the number of the first charging modules 102 , and they correspond one to one.

[0125] The control unit is also used to close the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the selection switch corresponding to the charging gun connected to the device to be powered, so as to power the device to be powered through the device to be powered.

[0126] In the embodiment of the present application, the input power of the energy storage charging device is a low power input, and the input power can be ≤150kW, that is, the rated power of the first bidirectional inverter and the second bidirectional inverter connected to the power grid is ≤150kW. The output of the energy storage charging device is a plurality of charging guns, and the total power of the sum of the power of the charging guns can be ≥360kW, that is, the energy storage charging device provided in the embodiment of the present application realizes low power input and high power output.

[0127] In an embodiment of the present application, the ratio of the output power of the energy storage device in the energy storage charging equipment to the sum of the rated powers of the multiple first charging modules and the multiple second charging modules is 1:1, that is, the output power of the energy storage device can be equal to the sum of the rated powers of the multiple first charging modules and the multiple second charging modules.

[0128] In some embodiments, the power of the multiple first charging modules and the multiple second charging modules can be provided by the energy storage device and the power grid. Therefore, the sum of the rated powers of the multiple first charging modules and the multiple second charging modules can be greater than the output power of the energy storage device.

[0129] In the embodiment of the present application, the ratio of the rated energy to the rated power of the energy storage device is not greater than 1:3.

[0130] The charging method provided in the embodiment of the present application is implemented based on the energy storage charging device. The description of the embodiment of the energy storage charging device side is similar to the description of the above method embodiment, and is provided with similar beneficial effects as the method embodiment. In some embodiments, the functions or modules provided in the energy storage charging device provided in the embodiment of the present disclosure can be used to execute the method described in the above method embodiment. For technical details not disclosed in the embodiment of the energy storage charging device of the present application, please refer to the description of the method embodiment of the present application for understanding.

[0131] The following is an explanation of an exemplary application of the embodiments of the present application in a practical application scenario.

[0132] In order to solve the problems existing in the related art, the embodiment of the present application provides a power distribution architecture and method for multiple charging guns, which is applied to a storage-charging integrated device (i.e., energy storage charging device) with multiple charging guns. Fig.10 Schematic diagram of the architecture of the storage and charging machine provided in the embodiment of the present application, such as Fig.10As shown, the storage-charging integrated machine 10 includes a first bidirectional AC / DC 1 (i.e., a first bidirectional inverter), a second bidirectional AC / DC 2 (i.e., a second bidirectional inverter), an energy storage module 3 (i.e., an energy storage device), a charging device bidirectional DC / DC 4 (including n first charging device bidirectional DC / DCs and m second charging device bidirectional DC / DCs), a power distribution unit 5 (i.e., a power supply switch), a control unit 6, a wireless communication module 7, a first connecting DC bus 8, a second connecting DC bus 9, an energy storage connecting switch QF1, a bus connecting switch QF2, a plurality of control connecting switches K and a plurality of charging guns 101, wherein the number of the control connecting switches K is the same as the number of the plurality of charging guns 101 and corresponds one to one.

[0133] Among them, the input power of the storage and charging machine 10 is a small power input, the input power is ≤150kW, the system output of the storage and charging machine 10 is multiple charging guns, and the total power of the sum of the charging gun powers is ≥360kW; the output power of the energy storage module 3 and the rated power of the bidirectional DC / DC4 of the charging device are in a ratio of 1:1; the rated energy of the energy storage module 3 and the rated power ratio are not greater than 1:3; the rated power of the bidirectional AC / DC device interconnected with the transformer (ie, the first bidirectional AC / DC1 and the second bidirectional AC / DC2) is ≤150kW, that is, the input power of the storage and charging machine 10 is a small power input.

[0134] In the embodiment of the present application, the power distribution unit 5 can be used to evenly distribute the power of multiple charging guns. By closing the bus connection switch QF2 and disconnecting the energy storage connection switch QF1, the first connected DC bus 8 is connected to the second connected DC bus 9, and the vehicle 20 to be powered (i.e., the vehicle connected to the charging gun 101-2 to be powered) performs the V to G function and the vehicle n to be charged (i.e., the vehicle connected to the charging gun 101-n to be prepared) performs the charging function, and the energy of the vehicle 20 to be powered is transferred to the vehicle n to be charged. Here, only one vehicle connected to the charging gun is allowed to perform the V to G function.

[0135] In the embodiment of the present application, when the SOC ≥ p or SOE ≥ q (p and q can be set, for example, p is 5% and q is 5%) of the energy storage module 3, all charging gun power comes from the energy storage module and / or the power grid.

[0136] Fig.11 is a schematic diagram of the power distribution process of multiple charging guns in the storage-charging integrated machine provided in the embodiment of the present application, such as Fig.11 As shown, the power distribution of multiple charging guns in the storage-charging integrated machine can be achieved through steps S111 to S114:

[0137] Step S111: insert a charging gun and prepare for charging.

[0138] In an embodiment of the present application, when a charging gun in the storage-charging integrated machine is connected to a vehicle and is ready to charge, the charging gun power distribution process is started.

[0139] Step S112: The power of the bidirectional DC / DC of the charging device is set to come from the energy storage module and the power grid, and the bidirectional DC / DC provides power to a single gun.

[0140] The present application can set a bidirectional DC / DC power source for the charging device, which can be an energy storage module or a power grid.

[0141] Step S113: Check whether the number of charging guns n≥2.

[0142] In an embodiment of the present application, power distribution is performed in response to a plurality of devices to be charged being connected to the storage-charging integrated machine, that is, when a plurality of charging guns are connected to the devices to be charged.

[0143] Step S114: automatically distribute the power of power module n+1 to power module n+m to each charging gun according to the charging power request value of the electric vehicle corresponding to each charging gun.

[0144] Fig.12 is a schematic diagram of the structure of the power distribution unit provided in the embodiment of the present application, such as Fig.12 As shown, the charging device bidirectional DC / DC4 includes multiple charging device bidirectional DC / DCs, and there can be n+m charging device bidirectional DC / DCs, including n first charging device bidirectional DC / DCs 121 and m second charging device bidirectional DC / DCs 122. Each first charging device bidirectional DC / DC 121 is correspondingly connected to a charging gun 101, and each of the second charging device bidirectional DC / DC 122 is respectively connected to each charging gun, and each second charging device bidirectional DC / DC 122 is connected to a charging gun 101 through a power distribution unit 5 (that is, multiple power supply connection switches Kq).

[0145] The embodiment of the present application can automatically distribute the power of power module n+1 to power module n+m (i.e., m second charging device bidirectional DC / DC 122) to each charging gun connected to the vehicle according to the charging power request value of each charging gun corresponding to the electric vehicle.

[0146] Fig.13 is a schematic diagram of the power distribution process of the energy storage module provided in the embodiment of the present application, such as Fig.13 As shown, the power distribution of the energy storage module can be achieved through steps S131 to S135:

[0147] Step S131: Whether the energy storage module SOC≥p or SOE≥q.

[0148] Here, p and q can be set by oneself, p and q can be the same or different, and p and q can be 5%.

[0149] In the embodiments of the present application, after being connected to the vehicle, the remaining power or remaining energy of the energy storage module can be determined first. When the energy of the energy storage module is too low, the vehicle can be powered by the power grid.

[0150] Step S132: The power of multiple charging guns is all provided by the energy storage module and the power grid together.

[0151] In some embodiments, when the SOC of the energy storage module ≥ p or the SOE ≥ q, the power of multiple charging guns can be all provided by the energy storage module and the power grid together.

[0152] Step S133: According to the charging power request value of each charging gun corresponding to the electric vehicle, automatically allocate the power of power modules n + 1 to n + m to each charging gun.

[0153] Here, power modules n + 1 to n + m refer to m second charging devices bidirectional DC / DC122. At this time, based on the charging power request value of each charging gun corresponding to the electric vehicle, the power provided by the energy storage module and the power grid together in the m second charging devices bidirectional DC / DC122 can be evenly allocated to each charging gun, or the power can be intelligently allocated to each charging gun based on the charging power request value, so that each charging gun can provide the required charging power for the corresponding vehicle.

[0154] Step S134: The power of multiple charging guns is all provided by the power grid alone.

[0155] In some embodiments, when the SOC of the energy storage module < p or the SOE < q, the power of multiple charging guns is all provided by the power grid alone, the energy storage module does not provide power, and when the power of the power grid is sufficient, the energy storage module is replenished.

[0156] Step S135: According to the charging power request value of each charging gun corresponding to the electric vehicle, automatically allocate the power of the m second charging devices bidirectional DC / DC122 to each charging gun.

[0157] At this time, based on the charging power request value of each charging gun corresponding to the electric vehicle, the power provided by the power grid together in the m second charging devices bidirectional DC / DC122 can be allocated to each charging gun, or the power can be intelligently allocated to each charging gun based on the charging power request value, so that each charging gun can provide the required charging power for the corresponding vehicle.

[0158] Based on Fig.10 , Fig.14: is a schematic diagram of the flow of the V to G function in the storage and charging integrated machine provided in the embodiment of the present application, such as Fig.14 As shown, the V to G function in the storage and charging integrated machine is implemented through steps S141 to S144:

[0159] Step S141, the charging gun is inserted and ready for V to G.

[0160] In some embodiments, a power supply request from a vehicle is received, and it is determined that the vehicle connected to the charging gun is ready for V to G.

[0161] Step S142: determine whether the number of charging plugs requiring the V to G function is n≥2.

[0162] Here, when it is determined that there is a vehicle ready for V to G, it is necessary to determine whether the number of charging guns that currently require the V to G function is greater than 1, that is, whether there is a vehicle currently performing V to G. In order to ensure the system stability of the storage and charging machine, it is necessary to accurately control the power input received from the electric vehicle. Processing V to G requests from multiple vehicles at the same time may cause unstable power input and affect the performance and life of the storage and charging machine. Therefore, the storage and charging machine can only receive power input from one vehicle at a time.

[0163] Step S143: close the control switch of the V to G charging gun corresponding to the V to G function, and start the second bidirectional AC / DC2 to start the V to G function.

[0164] If the vehicle currently connected to the storage and charging device is not performing V to G, close the control switch corresponding to the vehicle that needs to perform V to G, such as Fig.10 As shown, if the charging gun that needs to be connected to the vehicle for V to G is the charging gun to be powered 101-2, the target control connection switch K2 among the multiple control connection switches K is closed, and the second bidirectional AC / DC2 is started, so that the V to G vehicle supplies power to the grid.

[0165] In some embodiments, the target control connection switch K2, the bus connection switch QF2 and the energy storage connection switch QF1 may also be closed, so that the V to G powered vehicle 20 supplies power to the energy storage module 3.

[0166] Step S144: a prompt is displayed: “There are too many V to G vehicles. The V to G function cannot be used temporarily!”.

[0167] In some embodiments, if the vehicle currently connected to the storage and charging device is performing V to G, it cannot receive V to G from other vehicles. At this time, the display interface of the storage and charging device may display "Too many V to G vehicles, the V to G function cannot be used temporarily!" to prompt the user.

[0168] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial number of each step / process mentioned above does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The serial numbers of the embodiments of the present application mentioned above are for description only and do not represent the advantages and disadvantages of the embodiments.

[0169] The present application uses descriptions such as "upper", "lower", "top", "bottom", "front", "back", "inside" and "outside" to indicate directions or positional relationships. This is only for the convenience of describing the present application, and does not indicate or imply that the device referred to must be set in a specific direction, constructed and operated in a specific direction. Therefore, it should not be understood as limiting the scope of protection of the present application.

[0170] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0171] It should be noted that, in this application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0172] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0173] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, the functional units in the embodiments of the present application may be all integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0174] The above is only an embodiment of the present application and is not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A charging method, applied to a control unit of an energy storage charging device, wherein the energy storage charging device is connected to a plurality of charging guns; the energy storage charging device at least comprises an energy storage device connected to a DC bus, a plurality of first charging modules correspondingly connected to each charging gun, and a plurality of second charging modules connected to each charging gun, wherein any two of the plurality of first charging modules and the plurality of second charging modules are connected in parallel to the DC bus, and an energy storage switch is provided between the energy storage device and the DC bus; the DC bus comprises a first DC bus and a second DC bus, wherein the first DC bus and the second DC bus are connected via a bus switch, the first DC bus is connected to a power grid via a first bidirectional inverter, and the second DC bus is connected to the power grid via a second bidirectional inverter, a selection switch is provided between each first charging module and the first DC bus, and a control switch is provided between each charging gun and the second DC bus; characterized in that The charging method comprises: In response to a charging request sent by the device to be charged, the remaining power of the energy storage device is obtained, and the charging power of the device to be charged is compared with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result; In response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply requirement, determining the power to be allocated based on the power to be charged and the first power supply; Based on the second power supply power of each second charging module and the power to be allocated, among the plurality of second charging modules that are not supplying energy, at least one second charging module whose sum of power supply power is greater than or equal to the power to be allocated and whose error is within a preset range is determined as a target charging module; In response to the remaining power being less than a preset threshold, the energy storage switch is turned off, and the first charging module and the target charging module corresponding to the device to be charged are powered by the power grid connected to the energy storage charging device; In response to a power supply request from the device to be powered, determining whether the energy storage charging device is connected to the device to be charged; In response to the energy storage charging device being connected to a device to be charged, the control switch corresponding to the charging gun connected to the device to be powered, the bus switch, and the selection switch corresponding to the charging gun connected to the device to be charged are closed to power the device to be charged through the device to be powered.

2. The charging method according to claim 1, characterized in that: The second charging module is connected to the charging gun via a power supply switch; and determining the power to be allocated based on the power to be charged and the first power supply includes: determining a difference between the power to be charged and the first power to be supplied as the power to be allocated; Correspondingly, the method further includes: The power switch between the target charging module and the charging gun connected to the device to be charged is closed to supply power to the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

3. The charging method according to claim 1 or 2, characterized in that: The method further comprises: In response to the remaining power being greater than or equal to the preset threshold, the energy storage switch is closed, and power is supplied to the first charging module and the target charging module corresponding to the device to be charged through the power grid and the energy storage device.

4. The charging method according to claim 3, characterized in that: The method further comprises: In response to the energy storage charging device not being connected to the device to be charged, the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the energy storage switch are closed to power the energy storage device through the device to be powered, and / or to power the power grid through the device to be powered and the second bidirectional inverter.

5. The charging method according to claim 4, characterized in that: The method further comprises: In response to the power supply request, determining whether the energy storage charging device is connected to the device to be powered that is currently being powered; In response to the energy storage charging device being connected to a device to be powered that is currently powered, a power supply end time of the device to be powered that is currently powered is obtained, and the power supply end time is sent to the device to be powered that issues the power supply request.

6. An energy storage charging device, characterized in that: The energy storage charging device comprises: An energy storage device is connected to the DC bus of the energy storage charging device, an energy storage switch is provided between the energy storage device and the DC bus, and the energy storage device is used to store electrical energy; A plurality of first charging modules, each of which is connected to a corresponding charging gun, wherein the energy storage charging device is connected to a plurality of charging guns, and the charging guns are used to connect to the device to be charged; A plurality of second charging modules, each second charging module is connected to each charging gun, and any two of the plurality of first charging modules and the plurality of second charging modules are connected in parallel to the DC bus; the DC bus comprises a first DC bus and a second DC bus, and the first DC bus and the second DC bus are connected via a bus switch; a first bidirectional inverter, connected to the first DC bus and the grid respectively, for converting between AC and DC, and a selection switch is provided between each first charging module and the first DC bus; A second bidirectional inverter is provided between the second DC bus and the grid, and a control switch is provided between each charging gun and the second DC bus; A control unit, configured to obtain the remaining power of the energy storage device in response to a charging request sent by the device to be charged, and compare the charging power of the device to be charged with the first power supply power of the first charging module corresponding to the charging gun connected to the device to be charged to obtain a comparison result; in response to the comparison result indicating that the first charging module corresponding to the device to be charged does not meet the power supply demand, determine the power to be allocated based on the charging power to be charged and the first power supply power; based on the second power supply power of each second charging module and the power to be allocated, among the multiple second charging modules that are not supplying energy, the sum of the power supply powers is greater than or equal to the power to be allocated, and At least one second charging module whose error is within a preset range is determined as a target charging module; in response to the remaining power being less than a preset threshold, the energy storage switch is disconnected, and the first charging module corresponding to the device to be charged and the target charging module are powered by the power grid connected to the energy storage charging device; in response to a power supply request from the device to be powered, it is determined whether the energy storage charging device is connected to the device to be charged; in response to the energy storage charging device being connected to the device to be charged, the control switch corresponding to the charging gun connected to the device to be powered, the bus switch, and the selection switch corresponding to the charging gun connected to the device to be charged are closed, and power is supplied to the device to be charged through the device to be powered.

7. The energy storage charging device according to claim 6, characterized in that: The energy storage charging device also includes a power supply switch between the second charging module and the charging gun; The control unit is further configured to determine a difference between the power to be charged and the first power supply as the power to be allocated; The control unit is further used to close the power switch between the target charging module and the charging gun connected to the device to be charged, so as to power the device to be charged through the target charging module and the first charging module corresponding to the device to be charged.

8. The energy storage charging device according to claim 6 or 7, characterized in that: The control unit is further used to close the energy storage switch in response to the remaining power being greater than or equal to the preset threshold, and to supply power to the first charging module and the target charging module corresponding to the device to be charged through the power grid and the energy storage device.

9. The energy storage charging device according to claim 8, characterized in that: The control unit is also used to close the control switch corresponding to the charging gun connected to the device to be powered, the bus switch and the energy storage switch in response to the energy storage charging device not being connected to the device to be charged, so as to power the energy storage device through the device to be powered, and / or to power the power grid through the device to be powered and the second bidirectional inverter.

10. The energy storage charging device according to claim 9, characterized in that: The rated power of the first bidirectional inverter and the second bidirectional inverter is less than a first preset value, and the sum of the power supply powers of multiple first charging modules and multiple second charging modules is greater than a second preset value; wherein the second preset value is greater than the first preset value.

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