Charging method and energy storage charging device

Abstract

Provided are a charging method and an energy storage charging device (100). The charging method comprises: in response to a charging request sent by a device to be charged, acquiring the remaining power of an energy storage apparatus (105), and comparing charging power for the device to be charged with first power supply power of a first charging module (102) corresponding to a charging gun (101) connected to the device to be charged, to obtain a comparison result (S201); in response to the comparison result representing that the first charging module corresponding to the device to be charged does not satisfy a power supply requirement, on the basis of the charging power and the first power supply power, determining power to be allocated (S202); on the basis of second power supply power of each second charging module (103), and the power to be allocated, determining at least one second charging module that satisfies an allocation condition as a target charging module (S203); and in response to the remaining power being less than a preset threshold, turning off an energy storage switch (106), and supplying, by means of a power grid connected to an energy storage charging device, power to the first charging module corresponding to the device to be charged, and the target charging module (S204). According to the described method and device, the power of the charging gun is supplemented when the charging power is insufficient, the structure is simple, and the waste of resources is reduced.

Description

Charging methods and energy storage charging equipment

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410906500.5, filed on July 8, 2024, entitled “Charging Method and Energy Storage Charging Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, and includes, but is not limited to, a charging method and an energy storage charging device. Background Technology

[0004] In recent years, the world has faced major challenges to sustainable development, such as energy shortages, climate change, and pollutant emissions. Therefore, countries have begun to pay widespread 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 one of the major obstacles to the widespread acceptance of pure electric vehicles. Compared to traditional automobiles, electric vehicles are more dependent on charging systems.

[0005] However, different electric vehicles have different battery types and charging power. When using charging piles with multiple charging guns to distribute power, the relevant technologies usually distribute the power supply from the power grid equally, resulting in some charging piles having insufficient power and others having excessive power. This not only fails to meet the charging needs of different vehicles but also leads to a waste of resources. Summary of the Invention

[0006] To address the problems existing in related technologies, this disclosure provides a charging method and an energy storage charging device, which includes multiple second charging modules to supplement the power of the charging gun when the charging power is insufficient. This method not only has a simple structure and can meet the charging needs of vehicles with different power ratings, but also reduces resource waste.

[0007] In a first aspect, this disclosure provides a charging method applied to a control unit of an energy storage charging device, wherein the energy storage charging device is connected to multiple charging guns; the energy storage charging device includes at least an energy storage device connected to a DC bus, multiple first charging modules corresponding to each charging gun, and multiple second charging modules connected to each charging gun, wherein any two of the multiple first charging modules and multiple 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 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 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, 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 charging power and the first power supply power; based on the second power supply power of each second charging module and the power to be allocated, determining at least one second charging module that meets the allocation conditions as a 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.

[0008] In the above embodiments, in addition to the first charging module corresponding to each charging gun, multiple additional second charging modules connected in parallel with the first charging module are set in the energy storage charging device. This is used 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 resource waste. At the same time, the power source for charging the device to be charged is determined based on the state of the energy storage device, which reduces the problem of continuing to supply power when the energy storage device has a low power level, thus preventing damage to the energy storage device.

[0009] In some embodiments, the second charging module and the charging gun are connected via a power supply switch; determining the power to be allocated based on the power to be charged and the first power supply includes: determining the difference between the power to be charged and the first power supply as the power to be allocated; correspondingly, determining at least one second charging module that meets the allocation conditions as a target charging module based on the second power supply of each second charging module and the power to be allocated includes: determining at least one second charging module among the multiple second charging modules whose sum of power supply is greater than or equal to the power to be allocated and whose error is within a preset range as the target charging module; correspondingly, the charging method further includes: closing the power supply 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.

[0010] In the above embodiments, the error between the target charging module and the power to be allocated is taken into account, and the error is controlled within a preset range, which can reduce resource waste.

[0011] In some embodiments, the energy storage charging device further includes a first bidirectional inverter, the other side of which is connected to the power grid; the charging method further includes: in response to the remaining power being greater than or equal to a 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.

[0012] In the above embodiments, the energy source for charging the device is determined based on the state of the energy storage device. When the energy storage device has a low power level, it continues to supply power through the power grid, thus avoiding the problem of the energy storage device being damaged due to continuing to supply power when the power level is low.

[0013] In some embodiments, the DC bus of the energy storage charging device includes a first DC bus and a second DC bus, which are connected by a bus switch. The second DC bus is connected to each charging gun and a second bidirectional inverter, and a control switch is provided between each charging gun and the second DC bus. The charging method further includes: in response to a power supply request from a device to be charged, 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, closing the control switch and bus switch corresponding to the charging gun connected to the device to be charged, so as to supply power to the device to be charged through the device to be charged; in response to the energy storage charging device not being connected to a device to be charged, closing the control switch, bus switch and energy storage switch corresponding to the charging gun connected to the device to be charged, so as to supply power to the energy storage device through the device to be charged, and / or, supplying power to the grid through the device to be charged and the second bidirectional inverter.

[0014] In the above embodiments, electric vehicles can supply power to the grid when charging is not required. During peak grid periods, electric vehicles can act as distributed energy storage units, providing necessary power support to the grid, helping to alleviate grid pressure and thus improving overall energy efficiency. Electric vehicles have large battery capacities and fast charging capabilities, serving as a medium for energy storage and release, which can more effectively balance electricity supply and demand and reduce energy waste. Simultaneously, for electric vehicle owners, supplying power to the grid can provide some economic compensation, reducing vehicle operating costs.

[0015] In some embodiments, a selection switch is provided between each first charging module and the DC bus; closing the control switch and bus switch corresponding to the charging gun connected to the device to be powered, so as to supply power to the device to be charged through the device to be powered, includes: closing the control switch, bus switch and selection switch corresponding to the charging gun connected to the device to be powered, and supplying power to the device to be charged through the device to be powered.

[0016] In the above embodiments, electric vehicles can supply power to the grid when charging is not required. During peak grid periods, electric vehicles can act as distributed energy storage units, providing necessary power support to the grid, helping to alleviate grid pressure and thus improving overall energy efficiency. Electric vehicles have large battery capacities and fast charging capabilities, serving as a medium for energy storage and release, which can more effectively balance electricity supply and demand and reduce energy waste. Simultaneously, for electric vehicle owners, supplying power to the grid can provide some economic compensation, reducing vehicle operating costs.

[0017] In some embodiments, the charging method further includes: in response to a power supply request, determining whether the energy storage charging device is connected to a power supply device that is currently supplying power; in response to the energy storage charging device being connected to a power supply device that is currently supplying power, obtaining the power supply end time of the power supply device that is currently supplying power, and sending the power supply end time to the power supply device that issued the power supply request.

[0018] In the above embodiments, the energy storage charging equipment is limited to only one vehicle feeding the energy storage device or the power grid, which ensures the stability of power input and reduces the safety risks during power transmission.

[0019] Secondly, embodiments of this disclosure provide an energy storage charging device, comprising: an energy storage device connected to a DC bus of the energy storage charging device, wherein 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 first charging module being connected to a corresponding charging gun, wherein the energy storage charging device is connected to the plurality of charging guns, and the charging guns are used to connect to a device to be charged; a plurality of second charging modules, each second charging module being 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 a control unit, used to acquire energy storage in response to a charging request sent by the device to be charged. The remaining power of the device is determined, and the charging power of the device to be charged is compared with the first power supply 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 requirements, the power to be allocated is determined based on the charging power and the first power supply; based on the second power supply 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; in response to the remaining power being less than a preset threshold, the energy storage switch is disconnected, and the power grid connected to the energy storage charging device supplies power to the first charging module and the target charging module corresponding to the device to be charged.

[0020] In the above embodiments, in addition to the first charging module corresponding to each charging gun, multiple additional second charging modules are set 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. This can not only meet the charging needs of vehicles with different power, but also reduce resource waste. At the same time, the power source for charging the device to be charged is determined based on the state of the energy storage device, which reduces the problem of continuing to supply power when the energy storage device has a low power level, thus preventing damage to the energy storage device.

[0021] In some embodiments, the energy storage charging device further includes a power supply switch between the second charging module and the charging gun; the control unit is further configured 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 further configured to, based on the second power supply of each second charging module and the power to be allocated, determine at least one second charging module among the plurality of second charging modules whose sum of power supply is not less than the power to be allocated and whose error is within a preset range as the target charging module; the control unit is further configured to close the power supply 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.

[0022] In the above embodiments, the error between the target charging module and the power to be allocated is taken into account, and the error is controlled within a preset range, which can reduce resource waste.

[0023] In some embodiments, the energy storage charging device further includes a first bidirectional inverter; the first bidirectional inverter is connected to a DC bus and a power grid respectively, and is used for conversion between AC and DC power; the control unit is also used to close the energy storage switch in response to the remaining power being greater than or equal to a 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.

[0024] In the above embodiments, the energy source for charging the device is determined based on the state of the energy storage device. When the energy storage device has a low power level, it continues to supply power through the power grid, thus avoiding the problem of the energy storage device being damaged due to continuing to supply power when the power level is low.

[0025] In some embodiments, the DC bus of the energy storage charging device includes a first DC bus and a second DC bus, which are connected by a bus switch. Each charging gun is connected to the second DC bus by a control switch. The energy storage charging device also includes a second bidirectional inverter, which is located between the second DC bus and the power grid. The control unit is further configured 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 charged. The control unit is also configured to close the control switch and bus switch corresponding to the charging gun connected to the device to be charged in response to the energy storage charging device being connected to the device to be charged, so as to supply power to the device to be charged through the device to be charged. The control unit is also configured to close the control switch, bus switch and energy storage switch corresponding to the charging gun connected to the device to be charged in response to the energy storage charging device not being connected to the device to be charged, so as to supply power to the energy storage device through the device to be charged, and / or supply power to the power grid through the device to be charged and the second bidirectional inverter.

[0026] In the above embodiments, electric vehicles can supply power to the grid when charging is not required. During peak grid periods, electric vehicles can act as distributed energy storage units, providing necessary power support to the grid, helping to alleviate grid pressure and thus improving overall energy efficiency. Electric vehicles have large battery capacities and fast charging capabilities, serving as a medium for energy storage and release, which can more effectively balance electricity supply and demand and reduce energy waste. Simultaneously, for electric vehicle owners, supplying power to the grid can provide some economic compensation, reducing vehicle operating costs.

[0027] 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 supplied by the plurality of first charging modules and the plurality of second charging modules is greater than a second preset value; wherein, the second preset value is greater than the first preset value.

[0028] In the above embodiments, the rated power of the first bidirectional inverter and the second bidirectional inverter enables the energy storage charging device to achieve low power input, eliminating the need to configure an external transformer or expand the transformer capacity, thus reducing the cost of the energy storage charging device.

[0029] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0030] Figure 1 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure;

[0031] Figure 2 is a schematic diagram of an optional process of the charging method provided in an embodiment of this disclosure;

[0032] Figure 3 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure;

[0033] Figure 4 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure.

[0034] Figure 5 is a schematic diagram of an optional process of the charging method provided in an embodiment of this disclosure;

[0035] Figure 6 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure;

[0036] Figure 7 is a schematic diagram of an optional process of the charging method provided in an embodiment of this disclosure;

[0037] Figure 8 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure;

[0038] Figure 9 is a schematic diagram of an optional structure of the energy storage and charging device provided in an embodiment of this disclosure;

[0039] Figure 10 is a schematic diagram of the architecture of the integrated storage and charging machine provided in the embodiments of this disclosure;

[0040] Figure 11 is a schematic diagram of the power distribution of multiple charging guns in the integrated storage and charging machine provided in the embodiments of this disclosure;

[0041] Figure 12 is a schematic diagram of the power distribution unit provided in an embodiment of this disclosure;

[0042] Figure 13 is a schematic diagram of the power distribution process of the energy storage module provided in the embodiments of this disclosure;

[0043] Figure 14 is a flowchart illustrating the V to G function in the integrated storage and charging machine provided in this embodiment of the present disclosure. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this disclosure clearer, the disclosure will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this disclosure. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0045] In the following description, references to "some embodiments" describe a subset of all possible embodiments; however, it is understood that "some embodiments" may be the same 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 this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this disclosure belong. The terminology used in the embodiments of this disclosure is for the purpose of describing the embodiments of this disclosure only and is not intended to be limiting of the disclosure.

[0046] Currently, new energy batteries are increasingly widely used in daily life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing. In this embodiment, the battery involved can be a battery cell, also known as a battery unit. A battery cell refers to a basic unit capable of converting chemical energy into electrical energy, which can be used to manufacture battery modules or battery packs to supply power to electrical devices. A battery cell can be a rechargeable battery, which is a battery cell that can be recharged after discharge to activate the active materials and continue to be used. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and this embodiment does not limit the types.

[0047] In this embodiment, the battery cell is the core component of the battery pack. A battery pack typically contains multiple battery cells, which are combined to provide the required energy capacity and voltage. The components of a battery pack include at least: individual battery cells, a battery management system (BMS), a casing, wiring harnesses, connectors, and interfaces. These components work together to combine the battery cells into a fully functional battery pack for various applications. For example, the battery pack can be used in electric vehicles, energy storage systems, portable electronic devices, solar power systems, wind power systems, emergency backup power supplies, power tools, or electric bicycles, etc. This embodiment does not impose any limitations on this; specific selection can be made according to the actual application scenario.

[0048] In this embodiment, the battery cell can refer to any shape, such as a square cell or a round cell. The battery cell typically refers to a battery cell, which is one of the basic units constituting a battery. The battery cell is the core component of a battery, responsible for storing and releasing electrical energy. The battery cell can 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. This embodiment does not limit the type of battery cell; the specific type can be selected according to the actual application scenario.

[0049] 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 specific application requirements and performance specifications.

[0050] In embodiments of this disclosure, the battery may also be a single physical module comprising 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, parallel, or mixed via a busbar.

[0051] Currently, there are many types of new energy vehicles on the market, and their update cycles are relatively short. Different electric vehicles have different battery types and charging power, while charging piles only provide a single charging power. This makes it difficult to find a matching charging pile when charging a car in the street, and finding an available charging pile is also difficult due to the large number of new energy vehicles. Related technologies use multiple charging guns on a single charging pile to address this problem. However, when using multi-gun charging piles for power distribution, the power supply from the power grid is usually evenly distributed. But when charging vehicles with different power capacities using evenly distributed charging guns, some charging piles will have insufficient power while others will have excessive power. This not only fails to meet the charging needs of different vehicles but also leads to resource waste.

[0052] To alleviate the problems existing in the relevant technologies, the applicant has found that in addition to the charging module (i.e., bidirectional DC / DC charging device) corresponding to each charging gun in the energy storage charging equipment, multiple additional charging modules can be set up 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 resource waste.

[0053] Based on the above considerations, the applicant, after in-depth research, has set up multiple second charging modules in the energy storage charging device. In response to the charging request sent by the device to be charged, 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. If the first charging module corresponding to the device to be charged does not meet the power supply requirements, the power to be allocated is determined based on the charging power 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 through the target charging module and the first charging module corresponding to the device to be charged.

[0054] Thus, by providing multiple additional second charging modules in the energy storage charging device in addition to the first charging module corresponding to each charging gun, the power of a charging gun can be supplemented when the charging power of a certain charging gun is insufficient. This not only meets the charging needs of vehicles with different power ratings but also reduces resource waste.

[0055] The device to be charged in the charging method disclosed in this embodiment can be, but is not limited to, electrical equipment such as vehicles, electric vehicles, and electric wheelchairs.

[0056] This disclosure provides a charging method, in which the executing entity is an energy storage charging device, which can be an integrated energy storage and charging unit. The energy storage charging device and the device to be charged can communicate wirelessly or via a Controller Area Network (CAN) bus. The wireless communication between the energy storage charging device and the vehicle can employ various wireless communication protocols, including Bluetooth, Wi-Fi, and mobile communication protocols (such as 4G / 5G), to obtain information such as the battery type, capacity, and maximum charging power of the device to be charged. When the energy storage charging device communicates with the device to be charged via the CAN bus, before charging begins, the device to be charged establishes a connection with the energy storage charging device based on the charging gun. The energy storage charging device can obtain information such as the battery type, capacity, and maximum charging power of the device to be charged, and adjusts the power of the charging gun based on this information.

[0057] During the charging process, the energy storage charging device can periodically collect the charging parameters (such as voltage, current, SOC, etc.) of the battery of the device to be charged in order 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 the charging.

[0058] The following section will take the control unit of the energy storage charging device as an example and elaborate on the technical solution of this disclosure in conjunction with the accompanying drawings.

[0059] In some embodiments, FIG1 is an optional structural schematic diagram of an energy storage charging device provided in this disclosure. As shown in FIG1, 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 connected to each charging gun, and multiple second charging modules 103 connected to each charging gun. The rated power of different first charging modules may be the same or different, the rated power of different second charging modules may be the same or different, and the number of multiple first charging modules 102 may be 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 a DC bus 104. An energy storage switch 106 is provided between the energy storage device 105 and the DC bus 104. Any two of the multiple first charging modules 102 and the multiple second charging modules 103 are connected in parallel to the DC bus 104.

[0060] Here, the control unit and the hardware of the energy storage and charging devices, such as the first charging module and the second charging module, can communicate via a CAN bus to achieve real-time data transmission and control between the control unit and other modules. The energy storage and charging device 100 provided in this embodiment can be connected to any available charging gun, and there is no limitation on the type of charging gun. The energy storage and charging device 100 may also include multiple charging guns.

[0061] Based on Figure 1, Figure 2 is an optional flowchart of the charging method provided in this embodiment of the present disclosure. As shown in Figure 2, the charging method provided in this embodiment of the present disclosure can be implemented through steps S201 to S204:

[0062] Step S201: In response to the 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 of the first charging module corresponding to the charging gun connected to the device to be charged, and obtain the comparison result.

[0063] In some embodiments, a charging request can be a command input or selected by the user on the vehicle's central control screen, including but not limited to selection, confirmation, page turning, and scrolling operations on the central control screen. For example, a user can select a charging component on the vehicle's central control screen and send a charging request to the energy storage charging device via wireless communication.

[0064] In some embodiments, the charging request may also be a charging request issued when the device to be charged connects to one of the charging guns of the energy storage charging device, i.e., when the handshake is successful. The charging request includes at least information such as the type of battery and the charging power in the device to be charged.

[0065] In some embodiments, the first charging module may refer to a bidirectional DC / DC converter (Direct Current to Direct Current), which is connected to the power grid and the battery of the energy storage charging device via a DC bus to achieve bidirectional power transmission. Here, the rated power of the multiple first charging modules in the energy storage charging device can be the same or different. If they are the same, it means that each first charging module provides the same power to its corresponding charging gun, that is, the multiple first charging modules share the power of the energy storage module or the power grid equally. If the rated power of the multiple first charging modules is different, it means that each first charging module provides different power to its corresponding charging gun. In this case, the charging gun of the energy storage charging device may include a supercharger charging gun, a fast charger charging gun, and a slow charger charging gun, and different charging guns can provide different power supplies.

[0066] In this embodiment of the disclosure, the energy storage device in the energy storage charging device can 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 connections, 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.

[0067] In this embodiment of the disclosure, after receiving a charging request from the device to be charged, the energy storage charging device first determines the remaining power (SOC, State of Charge) of its own energy storage device. When the remaining power is sufficient, it can supply power through the energy storage device; when the power is insufficient, it can supply power through the power grid.

[0068] After receiving a 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 during charging. If the power provided by each of the first charging modules is different, the control unit can determine whether the power of the charging gun currently connected to the device to be charged matches the charging power required by the device to be charged. For example, if the charging power of the charging gun currently connected to the device to be charged is 70 kilowatts (kW), while the charging power required by the device to be charged is 150 kW, and the energy storage charging device also has a 150 kW charging gun that is idle, the control unit can prompt the user to replace the charging gun on the display interface of the energy storage charging device, or it can send the replacement information to the device to be charged.

[0069] Here, when the power provided by each first charging module is 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 that charging gun; if there is no charging gun that matches the charging power (the power supplied is greater than or equal to the charging power), the power supplied by each first charging module can be compared with the charging power, and the charging gun with the power supplied closest to the charging power can be displayed on the display interface of the energy storage charging device, prompting the user to switch to that charging gun. The user can also choose not to switch and charge using only the currently connected charging gun.

[0070] In some embodiments, when each first charging module provides the same power, 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 may refer to whether the currently connected charging gun meets the power supply requirements, 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.

[0071] 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 requirements, the power to be allocated is determined based on the power to be charged and the first power supply.

[0072] 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 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 needs.

[0073] Here, the power to be allocated can be the difference between the first power supply of the first charging module corresponding to the device to be charged and the power to be charged.

[0074] Step S203: Based on the second power supply 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.

[0075] In this embodiment of the disclosure, 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 via a DC bus, and is used to provide power to the charging gun when the power supply of the charging gun is insufficient.

[0076] Here, the second power supply of each second charging module can be the same or different.

[0077] In this embodiment of the disclosure, after determining the power to be allocated, a target charging module for providing charging power to the charging gun connected to the device to be charged is determined based on 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 120 kW, and the second power supply power of the multiple second charging modules are 20 kW, 40 kW, 60 kW, and 80 kW respectively, then the two second charging modules corresponding to 40 kW and 80 kW can be determined as the target charging modules, and the device to be charged is powered through the target charging modules and the first charging module corresponding to the device to be charged.

[0078] Step S204: In response to the remaining power being less than a preset threshold, disconnect the energy storage switch 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.

[0079] In some embodiments, the preset threshold can be 5%, that is, when the remaining power of the energy storage device is less than 5%, based on FIG1, the energy storage switch 106 between the DC bus 104 and the energy storage device 105 is disconnected, and the power grid connected to the energy storage charging device supplies power to the first charging module and the target charging module corresponding to the device to be charged, that is, provides power supply.

[0080] In this embodiment, since multiple first charging modules are connected in parallel to 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 supply current of the charging gun connected to the device to be charged is increased by the parallel target charging module, thereby increasing the supply power of the charging gun connected to the device to be charged to meet the charging power requirements of the device to be charged and improving charging efficiency. At the same time, the source of electrical energy for charging the device to be charged is determined based on the state of the energy storage device, reducing the problem of continuing to supply power when the energy storage device has a low power level, which could lead to damage to the energy storage device.

[0081] Here, since each second charging module is connected to each charging gun, after identifying the target charging module, the control unit can control the target charging module to provide power to the designated charging gun. As shown in Figure 1, a switch can be installed between the second charging module and the charging gun for control. Alternatively, the second charging module can have an internal switch for direct control by the control unit. Any feasible control scheme can be used, and this disclosure does not impose any limitations.

[0082] This embodiment of the disclosure provides an additional set of multiple second charging modules connected in parallel with the first charging module in addition to the first charging module corresponding to each charging gun in the energy storage charging device. This is used 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 resource waste.

[0083] In some embodiments, FIG3 is a schematic diagram of an optional structure of the energy storage charging device provided in this disclosure. As shown in FIG3, the second charging module 103 is connected to the charging gun via a power supply switch 301, and one charging gun is connected to each second charging module based on the power supply switch. Based on FIG3, step S202 can be implemented by step S2021:

[0084] Step S2021: Determine the difference between the power to be charged and the first power supply as the power to be allocated.

[0085] In this embodiment of the disclosure, 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.

[0086] Correspondingly, step S203 can be achieved through step S2031:

[0087] Step S2031: Based on the second power supply 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 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.

[0088] In this embodiment of the disclosure, when determining the target charging module, since different types of vehicles use different batteries and have different charging power, vehicles on the market have a variety of charging power. This embodiment of the disclosure meets the charging needs of vehicles with different power 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 can be 5 kW.

[0089] 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 be determined as the target charging module. For example, if the power to be allocated is 97 kW and the second power supplies of the multiple second charging modules are 3 kW, 5 kW, 10 kW, 20 kW, 30 kW, 40 kW, 60 kW, and 80 kW, then the two second charging modules corresponding to 20 kW and 80 kW can be determined as the target charging modules, or the four second charging modules corresponding to 3 kW, 5 kW, 30 kW, and 60 kW can be determined as the target charging modules. However, the error of the first target charging module is 3 kW, and the error of the second target charging module is 1 kW. In order to reduce resource waste, the second target charging module is determined as the target charging module for supplying power to the device to be charged.

[0090] In some embodiments, the energy storage charging device may already be connected to the device to be charged and is charging. Therefore, some of the multiple second charging modules may be supplying power to other charging guns. Thus, 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.

[0091] Correspondingly, the charging method also includes step S1:

[0092] Step S1: Close the power supply 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 first charging module corresponding to the target charging module and the device to be charged.

[0093] In this embodiment of the disclosure, after the target charging module is determined, the power supply switch between the target charging module and the charging gun connected to the device to be charged is turned off. Based on FIG3, the multiple charging guns 101 include the 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 in the multiple first charging modules 102. The target charging module determined in the multiple second charging modules 103 is 103-1. At this time, the first power supply switch 301-1 in the multiple power supply switches 301 is closed so as to supply power to the device to be charged through the target charging module 103-1 and the target first charging module 102-1.

[0094] In this embodiment of the disclosure, the error between the target charging module and the power to be allocated is taken into account, and the error is controlled within a preset range, which can reduce resource waste.

[0095] With the development of new energy power generation technologies, electric devices can supply electrical energy to charging devices, which in turn supply energy to energy storage systems or the power grid, achieving energy arbitrage and increasing user income. Electric devices supplying electrical energy can be categorized into vehicle-to-vehicle (V to G) and vehicle-to-grid (V to B) scenarios, or vehicle-to-battery (V to B) scenarios. After receiving electrical energy from a vehicle, the energy storage charging device can supply the received energy to other connected devices; it can also supply the received energy to the energy storage device for charging; or it can supply the received energy to the power grid for use by other electric devices connected to the grid.

[0096] Based on the foregoing embodiments, Figure 4 is a schematic diagram of an optional structure of the energy storage charging device provided in this disclosure. As shown in Figure 4, 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. Based on Figure 4, Figure 5 is a schematic diagram of an optional process of the charging method provided in this disclosure. As shown in Figure 5, the charging method provided in this disclosure may further include step S501:

[0097] Step S501: In response to the remaining power being greater than or equal to a preset threshold, the energy storage switch is closed, and power is supplied to the first charging module and the target corresponding to the device to be charged through the power grid and the energy storage device.

[0098] Here, the power grid converts AC power through the first bidirectional inverter. In this embodiment, the rated power of the first bidirectional inverter is less than or equal to 150kW, which enables the energy storage charging device to achieve low power input. There is no need to configure an external transformer or expand the transformer capacity for the energy storage charging device, thus reducing the cost of the energy storage charging device.

[0099] In this embodiment of the disclosure, when the remaining power of the energy storage device is greater than 5%, the energy storage switch can be closed to provide 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.

[0100] The embodiments disclosed herein determine the power source for charging the device based on the state of the energy storage device. When the energy storage device has a low power level, it continues to supply power through the power grid, thus avoiding the problem of the energy storage device being damaged due to continuing to supply power when the power level is low.

[0101] Based on the foregoing embodiments, Figure 6 is a schematic diagram of an optional structure of the energy storage charging device provided in this embodiment of the present disclosure. As shown in Figure 6, the DC bus 104 of the energy storage charging device includes a first DC bus 1041 and a second DC bus 1042. The first DC bus 1041 and the second DC bus 1042 are connected through a bus switch 601. The second DC bus 1042 is connected to each charging gun 101 and the second bidirectional inverter 602 respectively. A control switch 603 is provided between each charging gun 101 and the second DC bus 1042. Based on Figure 6, Figure 7 is a schematic diagram of an optional process of the charging method provided in this embodiment of the present disclosure. As shown in Figure 7, the charging method provided in this embodiment of the present disclosure may further include steps S701 to S703:

[0102] Step S701: In response to the power supply request of the device to be powered, determine whether the energy storage charging device is connected to the device to be charged.

[0103] In some embodiments, the device to be powered refers to the vehicle that supplies power to the energy storage charging device, and the power supply request refers to a power supply request sent by the power supply vehicle to the energy storage charging device via wireless communication or by connecting a charging gun, which includes at least the supply current and the supply power, i.e., the vehicle's V to G request. After receiving the power supply request, the energy storage charging device determines whether to accept the power supply from the device to be powered based on the supply current and the supply power in the power supply request.

[0104] In this embodiment of the disclosure, when receiving a power supply request from the device to be powered, it is confirmed whether the energy storage charging device is connected to the device to be powered. If the device to be powered is connected, the power from the device to be powered can be supplied to the device to be powered. If the device to be powered is not connected, the power can be transmitted to the energy storage device of the energy storage charging device or the power grid.

[0105] Step S702: In response to the energy storage charging device being connected to a device to be charged, close the control switch and bus switch corresponding to the charging gun connected to the device to be charged, so as to supply power to the device to be charged through the device to be charged.

[0106] In some embodiments, FIG8 is a schematic diagram of an optional structure of the energy storage charging device provided in this disclosure. As shown in FIG8, a selection switch 801 is provided between each first charging module 102 and the DC bus (i.e., the first DC bus 1041 in FIG8). Correspondingly, step S702 can be implemented by step S7021:

[0107] Step S7021: Close the control switch, bus switch and selector switch corresponding to the charging gun connected to the device to be powered, and supply power to the device to be powered through the device to be powered.

[0108] In some embodiments, if the energy storage charging device is connected to a device to be charged, the device to be charged is powered by the device to be powered. At this time, the control switch, bus switch, and selection switch corresponding to the charging gun connected to the device to be powered 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 charging gun to be prepared 101-n. At this time, the control switch (power supply control switch 603-2 in the figure), the bus switch 601, and the selection switch (charging selection switch 801-n in the figure) corresponding to the charging gun to be powered 101-2 connected to the device to be powered are closed to realize the device to be powered to supply power to the device to be charged.

[0109] Step S703: In response to the energy storage charging device not being connected to the device to be charged, close the control switch, bus switch and energy storage switch corresponding to the charging gun connected to the device to be charged, so as to supply power to the energy storage device through the device to be charged, and / or supply power to the grid through the device to be charged and the second bidirectional inverter.

[0110] In this embodiment of the disclosure, if the energy storage charging device is not connected to the device to be charged, the energy storage device of the energy storage charging device or the power grid is powered through the device to be powered. Based on FIG8, the power supply control switch 603-2, bus switch 601 and energy storage switch 106 corresponding to the charging gun 101-2 connected to the device to be powered can be closed to power the energy storage device through the device to be powered, or to power the power grid through the device to be powered and the second bidirectional inverter 602. Alternatively, the power supply control switch 603-2, bus switch 601 and energy storage switch 106 corresponding to the charging gun 101-2 connected to the device to be powered can be closed to power both the energy storage device and the power grid through the device to be powered and the second bidirectional inverter 602.

[0111] This disclosure enables electric vehicles to supply power to the grid when they do not require charging and have sufficient electrical energy. During peak grid periods, electric vehicles can act as distributed energy storage units, providing necessary power support to the grid, helping to alleviate grid pressure and thus improving overall energy efficiency. Simultaneously, the large battery capacity and rapid charging of electric vehicles, as a medium for energy storage and release, can more effectively balance electricity supply and demand, reducing energy waste. Furthermore, for electric vehicle owners, supplying power to the grid can provide some economic compensation, reducing vehicle operating costs.

[0112] In some embodiments, the charging method provided in this disclosure may further include steps S11 and S12:

[0113] Step S11: In response to the power supply request, determine whether the energy storage charging device is connected to the device that is currently receiving power.

[0114] In this embodiment of the disclosure, in order to ensure the system stability of the energy storage charging device, it is necessary to precisely control the power input received from the electric vehicle. Simultaneously processing V to G requests from multiple vehicles may lead to unstable power input, affecting the performance and lifespan of the energy storage charging device. Therefore, the energy storage charging device can only receive the input of one device to be powered at a time to reduce safety risks during power transmission, such as overcurrent and overvoltage problems.

[0115] Therefore, when receiving a V to G request from a device to be powered, this embodiment of the present disclosure will first determine whether the energy storage charging device is currently supplying power to a device to be powered.

[0116] Step S12: In response to the energy storage charging device being connected to a device that is currently being powered, obtain the power supply end time of the device that is currently being powered and send the power supply end time to the device that issued the power supply request.

[0117] Here, when the energy storage charging device is connected to a device that is currently supplying power, it can send a data acquisition request to the device to obtain the remaining power of the vehicle, estimate the power supply end time of the device, and send the power supply end time to the device that sent the power supply request, so that the owner of the device can decide whether to wait for the vehicle to finish supplying power before supplying power.

[0118] The embodiments disclosed herein limit the energy storage charging device to only one vehicle for V to G, ensuring stable power input and reducing safety risks during power transmission.

[0119] Figure 9 is a schematic diagram of an optional structure of the energy storage charging device provided in this embodiment of the present disclosure. As shown in Figure 9, this embodiment of the present disclosure provides an energy storage charging device 100, which can be connected to multiple charging guns 101. The energy storage charging device 100 includes at least multiple first charging modules 102, multiple second charging modules 103, and a control unit (not shown in the figure). The control unit is wired or wirelessly connected to each module in the energy storage charging device 100 to realize 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, which are connected via a bus switch 601). An energy storage switch 106 is provided between the energy storage device 105 and the DC bus (i.e., the first DC bus 1041). The energy storage device 105 is used to store electrical energy.

[0120] The charging gun is used to connect to the device to be charged or the device to be powered. Each first charging module is connected to one charging gun, and each second charging module is connected to each charging gun.

[0121] 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 of the first charging module corresponding to the charging gun connected to the device to be charged, and 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 requirements, the control unit determines the power to be allocated based on the charging power and the first power supply; based on the second power supply 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; in response to the remaining power being less than a preset threshold, the control unit disconnects the energy storage switch and supplies 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.

[0122] In some embodiments, the energy storage charging device 100 further includes a power supply switch 301 between the second charging module 103 and the charging gun 101. Each charging gun is connected to all the second modules. When there are n charging guns and m second charging modules, there are n*m ​​power supply switches.

[0123] Correspondingly, the control unit is also used to control the power to be charged and 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 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 is not less than the power to be allocated and whose error is within a preset range is determined as the target charging module; the power supply switch between the target charging module and the charging gun connected to the device to be charged is closed, 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.

[0124] In some embodiments, the energy storage charging device 100 further includes a first bidirectional inverter 401; the energy storage device 105 is connected to the DC bus (i.e., the first DC bus 1041) via the energy storage switch 106 for storing electrical energy; the first bidirectional inverter 401 is connected to the DC bus (i.e., the first DC bus 1041) and the power grid respectively for converting between AC and DC power.

[0125] The control unit is also used to close the energy storage switch in response to the remaining power being greater than or equal to a 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.

[0126] 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 connected to the second DC bus 1042 and the power grid respectively.

[0127] The control unit is also configured to, in response to a power supply request from the device to be powered, determine whether the energy storage charging device is connected to 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 supply power to 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, 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 supply power to the energy storage device through the device to be powered, and / or, supply power to the grid through the device to be powered and the second bidirectional inverter.

[0128] In some embodiments, a selection switch 801 is provided between each first charging module 102 and the DC bus (i.e., the first DC bus 1041), and the number of selection switches 801 is the same as the number of first charging modules 102, and they correspond one-to-one.

[0129] The control unit is also used to close the control switch, bus switch and selection switch corresponding to the charging gun connected to the device to be powered, so as to supply power to the device to be charged through the device to be powered.

[0130] In this embodiment, the input power of the energy storage charging device is low-power input, which can be ≤150kW. That is, the rated power of the first and second bidirectional inverters connected to the grid is ≤150kW. The output of the energy storage charging device consists of multiple charging guns, and the total power of the sum of the charging guns can be ≥360kW. In other words, the energy storage charging device provided in this embodiment achieves low-power input and high-power output.

[0131] In this embodiment of the disclosure, the ratio of the output power of the energy storage device to the sum of the rated power of the multiple first charging modules and the multiple second charging modules in the energy storage charging device is 1:1, that is, the output power of the energy storage device can be equal to the sum of the rated power of the multiple first charging modules and the multiple second charging modules.

[0132] In some embodiments, the power of the plurality of first charging modules and the plurality of second charging modules can be provided jointly by the energy storage device and the power grid. Therefore, the sum of the rated power of the plurality of first charging modules and the plurality of second charging modules can be greater than the output power of the energy storage device.

[0133] In this embodiment of the disclosure, the ratio of the rated energy to the rated power of the energy storage device is no greater than 1:3.

[0134] The charging method provided in this disclosure is based on an energy storage charging device. The description of the energy storage charging device embodiment is similar to that of the method embodiment described above, and it has similar beneficial effects. In some embodiments, the functions or modules included in the energy storage charging device provided in this disclosure can be used to execute the method described in the method embodiment above. For technical details not disclosed in the energy storage charging device embodiments of this disclosure, please refer to the description of the method embodiment of this disclosure for understanding.

[0135] The following will describe an exemplary application of the embodiments of this disclosure in a practical application scenario.

[0136] To address the problems existing in related technologies, this disclosure provides a power distribution architecture and method for multiple charging guns, applicable to a multi-charging-gun integrated energy storage and charging unit (i.e., energy storage and charging device). Figure 10 is a schematic diagram of the architecture of the integrated energy storage and charging unit provided in this disclosure. As shown in Figure 10, the integrated energy storage and charging unit 10 includes a first bidirectional AC / DC1 (i.e., a first bidirectional inverter), a second bidirectional AC / DC2 (i.e., a second bidirectional inverter), an energy storage module 3 (i.e., an energy storage device), a charging device bidirectional DC / DC4 (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 connection switch QF1, a bus connection switch QF2, multiple control connection switches K, and multiple charging guns 101. The number of control connection switches K is the same as the number of multiple charging guns 101, and they correspond one-to-one.

[0137] The integrated energy storage and charging unit 10 has a low-power input power of ≤150kW. The system output of the integrated energy storage and charging unit 10 consists of multiple charging guns with a total power of ≥360kW. The ratio of the output power of the energy storage module 3 to the rated power of the bidirectional DC / DC 4 charging device is 1:1. The ratio of the rated energy to the rated power of the energy storage module 3 is no greater than 1:3. The rated power of the bidirectional AC / DC device (i.e., the first bidirectional AC / DC 1 and the second bidirectional AC / DC 2) connected to the transformer is ≤150kW, meaning that the integrated energy storage and charging unit 10 has a low-power input power.

[0138] In this embodiment, 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 opening the energy storage connection switch QF1, the first DC bus 8 and the second DC bus 9 are connected. Simultaneously, the vehicle to be powered (i.e., the vehicle connected to the charging gun 101-2) can perform V to G function, and the vehicle to be charged (i.e., the vehicle connected to the charging gun 101-n) can perform charging function, transferring energy from the vehicle to be powered (i.e., the vehicle connected to the charging gun 101-n). Here, only vehicles connected to one charging gun are allowed to perform the V to G function.

[0139] In this embodiment of the disclosure, when the SOC of the energy storage module 3 is greater than or equal to p or SOE is greater than or equal to q (p and q can be set, for example, p is 5% and q is 5%), all the power of the charging gun comes from the energy storage module and / or the power grid.

[0140] Figure 11 is a schematic flowchart of the power distribution of multiple charging guns in the integrated energy storage and charging machine provided in this embodiment of the present disclosure. As shown in Figure 11, the power distribution of multiple charging guns in the integrated energy storage and charging machine can be achieved through steps S111 to S114:

[0141] Step S111: Insert a charging gun into the socket to prepare for charging.

[0142] In this embodiment of the disclosure, when one of the charging guns in the integrated charging and storage unit is connected to the vehicle for charging, the charging gun power distribution process is initiated.

[0143] Step S112: Set the power of the bidirectional DC / DC converter of the charging device to come from the energy storage module and the power grid, and the bidirectional DC / DC converter provides power to the single gun.

[0144] This disclosure allows for the setting of a bidirectional DC / DC power source for the charging device, which can be an energy storage module or the power grid.

[0145] Step S113: Is the number of charging guns n≥2?

[0146] In this embodiment of the disclosure, power distribution is performed in response to the fact that multiple devices to be charged are connected in the integrated storage and charging machine, that is, when the number of charging guns connected to the devices to be charged is multiple.

[0147] Step S114: Based on the charging power request value of the electric vehicle corresponding to each charging gun, automatically allocate the power of power modules n+1 to n+m to each charging gun.

[0148] Figure 12 is a schematic diagram of the power distribution unit provided in the embodiment of this disclosure. As shown in Figure 12, the bidirectional DC / DC 4 of the charging device includes multiple bidirectional DC / DC devices. There can be n+m bidirectional DC / DC devices, including n first bidirectional DC / DC devices 121 and m second bidirectional DC / DC devices 122. Each first bidirectional DC / DC device 121 is connected to a charging gun 101. Each second bidirectional DC / DC device 122 is connected to each charging gun. Each second bidirectional DC / DC device 122 and a charging gun 101 are connected through the power distribution unit 5 (i.e., multiple power supply connection switches Kq).

[0149] According to the embodiments disclosed herein, the power of power modules n+1 to n+m (i.e., m second charging devices bidirectional DC / DC122) can be automatically allocated to each charging gun connected to the vehicle based on the charging power request value of the electric vehicle corresponding to each charging gun.

[0150] Figure 13 is a schematic flowchart of the power allocation of the energy storage module provided in the embodiment of this disclosure. As shown in Figure 13, the power allocation of the energy storage module can be achieved through steps S131 to S135:

[0151] Step S131: Whether the energy storage module's SOC ≥ p or SOE ≥ q.

[0152] Here, p and q can be set by the user, p and q can be the same or different, and p and q can be 5%.

[0153] In this embodiment of the disclosure, after connecting to the vehicle, the remaining charge or 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.

[0154] Step S132: The power of multiple charging guns is provided by the energy storage module and the power grid together.

[0155] In some embodiments, when the SOC of the energy storage module is greater than or equal to p or the SOE is greater than or equal to q, the power of multiple charging guns can be provided by the energy storage module and the power grid together.

[0156] Step S133: Based on the charging power request value of the electric vehicle corresponding to each charging gun, automatically allocate the power of power modules n+1 to n+m to each charging gun.

[0157] Here, power modules n+1 to n+m refer to m bidirectional DC / DCs 122 of the second charging device. At this time, based on the charging power request value of each charging gun for the electric vehicle, the power provided by the energy storage module and the power grid together in the m bidirectional DC / DCs 122 of the second charging device can be evenly distributed to each charging gun, or the power can be intelligently distributed 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] Step S134: The power of multiple charging guns is all provided by the power grid alone.

[0159] 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, and the energy storage module does not supply power. When the power of the power grid is sufficient, the energy storage module is replenished.

[0160] Step S135: Automatically distribute the power of the m bidirectional DC / DCs 122 of the second charging device to each charging gun according to the charging power request value of the electric vehicle corresponding to each charging gun.

[0161] At this time, based on the charging power request value of the electric vehicle corresponding to each charging gun, the power provided by the power grid together in the m bidirectional DC / DCs 122 of the second charging device can be distributed to each charging gun, or the power can be intelligently distributed 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.

[0162] Based on FIG. 10, FIG. 14 is a schematic flow chart of the V to G function in the integrated charging and energy storage device provided by an embodiment of the present disclosure. As shown in FIG. 14, the V to G function in the integrated charging and energy storage device is implemented through steps S141 to S144:

[0163] Step S141: The charging gun is inserted to prepare for V to G.

[0164] In some embodiments, receive the power supply request of the vehicle and determine that the vehicle connected to the charging gun is ready for V to G.

[0165] Step S142: Determine whether the number of inserted charging guns that require the V to G function is n≥2.

[0166] Here, when it is determined that a vehicle is preparing for V to G, it is necessary to determine whether the number of charging gun plugs that need V to G function is greater than 1, that is, whether a vehicle is currently using V to G. In order to ensure the system stability of the integrated energy storage and charging unit, it is necessary to precisely control the power input received from the electric vehicle. Simultaneously processing V to G requests from multiple vehicles may lead to unstable power input, affecting the performance and lifespan of the integrated energy storage and charging unit. Therefore, the integrated energy storage and charging unit can only receive power input from one vehicle at a time.

[0167] Step S143: Close the control switch of the V to G corresponding charging gun to start the V to G function of the second bidirectional AC / DC2.

[0168] If the vehicle currently connected to the integrated energy storage and charging unit is not performing V to G, then the control switch corresponding to the vehicle that needs to perform V to G is closed, as shown in Figure 10. If the charging gun connected to the vehicle that needs to perform V to G is the charging gun 101-2 to be powered, then 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.

[0169] In some embodiments, the target control connection switch K2, the bus connection switch QF2, and the energy storage connection switch QF1 can also be turned off, so that the vehicle 20 to be powered from V to G can supply power to the energy storage module 3.

[0170] Step S144: Prompt "Too many V to G vehicles, V to G function temporarily unavailable!"

[0171] In some embodiments, if the vehicle currently connected to the integrated charging and storage unit is performing V to G, it cannot receive V to G signals from other vehicles. In this case, the integrated charging and storage unit can display "Too many V to G vehicles, V to G function temporarily unavailable!" to notify the user.

[0172] It should be understood that the phrase "an embodiment" or "one embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this disclosure. Therefore, "in one embodiment" or "one embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this disclosure, the sequence numbers of the above steps / processes do not imply a sequential order of execution; 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 embodiments of this disclosure. The sequence numbers of the above embodiments of this disclosure are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0173] This disclosure uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this disclosure and is not intended to indicate or imply that the device referred to must be set in a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this disclosure.

[0174] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances.

[0175] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0176] In the several embodiments provided in this disclosure, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0177] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may all be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in hardware or in a combination of hardware and software functional units.

[0178] The above are merely embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this disclosure are included within the scope of protection of this disclosure.

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 includes at least 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 includes: 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, and the comparison result is obtained. 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 requirements, the power to be allocated is determined based on the power to be charged and the first power supply. Based on the second power supply 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. In response to the remaining power being less than a preset threshold, the energy storage switch is disconnected, 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 connected to the energy storage charging device.

2. The charging method according to claim 1, wherein, The second charging module is connected to the charging gun via a power switch; The step of determining the power to be allocated based on the power to be charged and the first power supplied includes: The difference between the power to be charged and the first power supplied is determined as the power to be allocated; Correspondingly, determining at least one second charging module that meets the allocation conditions as the target charging module based on the second power supply of each second charging module and the power to be allocated includes: Based on the second power supply of each second charging module and the power to be allocated, at least one second charging module among the plurality of second charging modules whose sum of power supply 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. Correspondingly, the charging method further includes: Close the power supply 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 first charging module corresponding to the target charging module and the device to be charged.

3. The charging method according to claim 1 or 2, wherein, The energy storage charging device further includes a first bidirectional inverter, the other side of which is connected to the power grid; the charging method further includes: 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 any one of claims 1 to 3, wherein, 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 by a bus switch. The second DC bus is connected to each charging gun and the second bidirectional inverter respectively. A control switch is provided between each charging gun and the second DC bus. The charging method further includes: 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; 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 charged and the bus switch are closed to supply power to the device to be charged through the device to be charged; 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 charged, the bus switch, and the energy storage switch are closed to supply power to the energy storage device through the device to be charged, and / or to supply power to the grid through the device to be charged and the second bidirectional inverter.

5. The charging method according to claim 4, wherein, Each first charging module is provided with a selection switch between itself and the DC bus; The control switch corresponding to the charging gun connected to the device to be powered and the bus switch are closed to supply power to the device to be charged through the device to be powered, including: 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 supply power to the device to be powered through the device to be powered.

6. The charging method according to any one of claims 1 to 5, wherein, The charging method further includes: 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 receiving power; In response to the energy storage charging device being connected to a device that is currently receiving power, the device obtains the power supply end time of the device that is currently receiving power and sends the power supply end time to the device that issued the power supply request.

7. An energy storage and charging device, the energy storage and charging device comprising: An energy storage device is connected to the DC bus of an energy storage charging device. An energy storage switch is provided between the energy storage device and the DC bus. The energy storage device is used to store electrical energy. Multiple first charging modules are connected to a corresponding charging gun. The energy storage charging device is connected to multiple charging guns, and the charging guns are used to connect to the device to be charged. Multiple second charging modules are provided, each second charging module is connected to each charging gun, and any two of the multiple first charging modules and multiple second charging modules are connected in parallel to the DC bus. The control unit is configured to, in response 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 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 requirements, determine the power to be allocated based on the charging power and the first power supply; based on the second power supply of each second charging module and the power to be allocated, determine at least one second charging module that meets the allocation conditions as the target charging module; in response to the remaining power being less than a preset threshold, disconnect the energy storage switch, and supply power to 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.

8. The energy storage and charging device according to claim 7, wherein, The energy storage and 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 the difference between the power to be charged and the first power supply as the power to be allocated; The control unit is further configured to, based on the second power supply power of each second charging module and the power to be allocated, determine at least one second charging module among the plurality of second charging modules whose sum of power supply power is not less than the power to be allocated and whose error is within a preset range as the target charging module. The control unit is also used to close the power supply 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 first charging module corresponding to the target charging module and the device to be charged.

9. The energy storage and charging device according to claim 7 or 8, wherein, The energy storage and 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 the conversion between AC and DC power; The control unit is further configured to, in response to the remaining power being greater than or equal to the preset threshold, close the energy storage switch and 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.

10. The energy storage and charging device according to claim 9, wherein, 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 by a bus switch. Each charging gun is connected to the second DC bus by a control switch. The energy storage charging device also includes a second bidirectional inverter. The second bidirectional inverter is located between the second DC bus and the power grid; The control unit is also configured 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. The control unit is also configured to, in response to the energy storage charging device being connected to a device to be charged, close the control switch corresponding to the charging gun connected to the device to be charged and the bus switch, so as to supply power to the device to be charged through the device to be charged; The control unit is further configured to, 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 supply power to the energy storage device through the device to be powered, and / or supply power to the grid through the device to be powered and the second bidirectional inverter.

11. The energy storage and charging device according to claim 10, wherein, 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 of the multiple first charging modules and the 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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