Charging system, charging control method and charging pile

Abstract

The present application discloses a charging system, a charging control method and a charging pile, wherein the charging system includes a first energy storage circuit, a charging circuit and an AC / DC conversion circuit; wherein: the first energy storage circuit is configured to provide a first charging power to the charging circuit; the second energy storage circuit is configured to provide a second charging power to the charging circuit; the AC / DC conversion circuit is configured to provide a third charging power to the charging circuit; the charging circuit is configured to use the first charging power and the second charging power to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions; and when the current electricity price is lower than the first threshold or the second energy storage circuit does not meet the preset power supply conditions, use the first charging power and the third charging power to charge the device to be charged. In this way, not only can the power supply pressure of the public power grid during peak power consumption be alleviated, but also the power consumption cost of the charging system is reduced and the revenue is increased.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging system, a charging control method and a charging pile. Background Art

[0002] The integrated storage and charging machine is a device that integrates an energy storage system and charging functions. It can store electrical energy through internal energy storage batteries and provide fast charging services for new energy vehicles when needed.

[0003] However, the current operation strategy of the integrated storage and charging machines is simple and disorderly. When multiple integrated storage and charging machines are charged centrally during peak electricity consumption periods, it will not only affect the power balance of the entire public power grid system, but also the electricity cost is high, affecting the benefits. Summary of the invention

[0004] The present application mainly provides a charging system, a charging control method and a charging pile, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also reduce the electricity cost of the charging system and increase profits.

[0005] The technical solution of this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a charging system, the charging system comprising a first energy storage circuit, a second energy storage circuit, a charging circuit and an AC / DC conversion circuit, and at least the first energy storage circuit and the charging circuit are included in a storage-charging integrated device; wherein:

[0007] The first output end of the AC / DC conversion circuit is connected to the first input end of the charging circuit and the first output end of the second energy storage circuit respectively, the second output end of the AC / DC conversion circuit is connected to the first output end of the first energy storage circuit and the second output end of the second energy storage circuit respectively, and the second input end of the charging circuit is connected to the second output end of the first energy storage circuit;

[0008] A first energy storage circuit is configured to provide a first charging power to the charging circuit;

[0009] a second energy storage circuit configured to provide a second charging power to the charging circuit;

[0010] an AC-DC conversion circuit, configured to provide a third charging power to the charging circuit;

[0011] The charging circuit is configured to use the first charging power and the second charging power to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions; or, when the current electricity price is lower than the first threshold or the second energy storage circuit does not meet the preset power supply conditions, use the first charging power and the third charging power to charge the device to be charged.

[0012] Through the above technical means, when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions, it is possible to determine to use the second charging power provided by the second energy storage circuit and the first charging power provided by the first energy storage circuit to charge the device to be charged. In this way, a variety of environmental factors can be comprehensively considered, and the second energy storage circuit can be selected to charge the device to be charged. This can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging device, and reduce the electricity cost of the storage and charging device based on the price difference of the public power grid, thereby increasing profits.

[0013] In some embodiments, the positive output terminal of the first energy storage circuit is connected to the negative output terminal of the AC / DC conversion circuit and the negative output terminal of the second energy storage circuit respectively, the negative output terminal of the first energy storage circuit is connected to the negative input terminal of the charging circuit, and the positive input terminal of the charging circuit is connected to the positive output terminal of the AC / DC conversion circuit and the positive output terminal of the second energy storage circuit respectively; or, the negative output terminal of the first energy storage circuit is connected to the positive output terminal of the AC / DC conversion circuit and the positive output terminal of the second energy storage circuit respectively, the positive output terminal of the first energy storage circuit is connected to the positive input terminal of the charging circuit, and the negative input terminal of the charging circuit is connected to the negative output terminal of the AC / DC conversion circuit and the negative output terminal of the second energy storage circuit respectively.

[0014] By means of the above technical means, the first energy storage circuit can be arranged on the positive side of the AC / DC conversion circuit, or on the negative side of the AC / DC conversion circuit, thus improving the circuit flexibility in the charging system.

[0015] In some embodiments, the positive output terminal of the second energy storage circuit is connected to the positive output terminal of the AC-DC conversion circuit, and the negative output terminal of the second energy storage circuit is connected to the negative output terminal of the AC-DC conversion circuit, and is configured to charge the second energy storage circuit based on a third charging power provided by the AC-DC conversion circuit, or to feed back electrical energy to the AC-DC conversion circuit based on the output power of the second energy storage circuit.

[0016] By means of the above technical means, the second energy storage circuit is integrated into the charging system, thus improving the integration and flexibility of the charging system.

[0017] In some embodiments, the charging system also includes a DC conversion circuit; wherein: the input end of the DC conversion circuit is respectively connected to the output end of the AC / DC conversion circuit and the output end of the second energy storage circuit, and the output end of the DC conversion circuit is respectively connected to the first output end of the first energy storage circuit and the first input end of the charging circuit.

[0018] Through the above technical means, by setting a DC conversion circuit, the voltage output by the AC-DC conversion circuit and / or the second energy storage circuit is converted to make it positive or negative. In this way, compared with the first charging power output by the first energy storage circuit, the charging power output by the charging system has a wider range and higher flexibility, and can be adapted to the voltage of a variety of devices to be charged, thereby expanding the scope of application of the charging system.

[0019] In some embodiments, the AC / DC conversion circuit includes an AC / DC conversion module and an AC power grid; wherein: the input end of the AC / DC conversion module is connected to the AC power grid; the output end of the AC / DC conversion module is respectively connected to the output end of the second energy storage circuit and the input end of the DC conversion circuit.

[0020] Through the above technical means, the AC-DC conversion circuit includes an AC power grid and an AC-DC conversion module, wherein the AC-DC conversion module can be arranged inside the storage-charging integrated device or outside the storage-charging integrated device. In this way, it is convenient for the charging system to directly connect to the AC power grid for charging, thereby improving the convenience of charging.

[0021] In some embodiments, the charging system also includes a first switch circuit and a second switch circuit, the first switch circuit includes a first switch and a second switch, and the second switch circuit includes a third switch, a fourth switch and a fifth switch; wherein: the first switch is connected in series between the second input end of the DC conversion circuit and the second output end of the first energy storage circuit, the second switch is connected in series between the first input end of the DC conversion circuit and the first output end of the first energy storage circuit, the third switch is connected in series between the first output end of the DC conversion circuit and the first input end of the charging circuit, the fourth switch is connected in series between the second output end of the first energy storage circuit and the second input end of the charging circuit, and the fifth switch is connected in series between the second output end of the DC conversion circuit and the first output end of the first energy storage circuit.

[0022] Through the above technical means, by controlling the on and off of each switch in the first switch circuit and the second switch circuit, based on the working state of the DC conversion circuit, the device to be charged is charged together with the energy storage circuit, and the charging system is controlled to charge the device to be charged and the AC power grid to charge the energy storage circuit. In this way, not only the power application range of the device to be charged is expanded, but also the switch can be turned off when charging is not needed, reducing energy waste.

[0023] In some embodiments, the charging system further includes a third switch circuit, and the third switch circuit includes a sixth switch; wherein: one end of the sixth switch is connected to the first output end of the AC / DC conversion module, and the other end of the sixth switch is connected to one end of the third switch.

[0024] Through the above technical means, by controlling the on or off of each switch in the third switch circuit, the charging system is controlled to charge the device to be charged, or the V2G function is realized based on the device to be charged to the AC power grid. In this way, charging can be performed according to the actual situation of the charging system and the device to be charged, which improves the flexibility of charging.

[0025] In some embodiments, the charging system also includes a fourth switching circuit, which includes a seventh switch and an eighth switch; wherein: the seventh switch is connected in series between the second output end of the second energy storage circuit and the second input end of the DC conversion circuit, and the eighth switch is connected in series between the first output end of the second energy storage circuit and the first input end of the DC conversion circuit.

[0026] Through the above technical means, the input or output of the electric energy of the second energy storage circuit is controlled by controlling the conduction or disconnection of the seventh switch and the eighth switch. In this way, the second energy storage circuit and / or the AC power grid can be flexibly selected to charge the device to be charged according to the peak-valley price difference of electricity prices, the energy storage state of the second energy storage circuit and other environmental factors. It can also supplement the electric energy for the first energy storage circuit and the second energy storage circuit when the current electricity price is at a low point or at a parity period, thereby comprehensively improving the efficiency of the charging system.

[0027] In some embodiments, the first energy storage circuit includes at least one first energy storage unit; wherein: the at least one first energy storage unit is connected in series and / or in parallel between the first output end of the first energy storage circuit and the second output end of the first energy storage circuit to provide a first charging power.

[0028] Through the above-mentioned technical means, the first energy storage circuit includes a plurality of first energy storage units connected in series and / or in parallel. Thus, due to the modularity of the first energy storage units, the first energy storage units can be freely increased or decreased, which facilitates the rapid connection and removal of the first energy storage units, thereby improving the flexibility of the charging power output by the charging system.

[0029] In some embodiments, at least some of the at least one first energy storage unit include a fifth switch circuit, which is connected in series between the first output end of the corresponding first energy storage unit and the second output end of the AC / DC conversion module.

[0030] By means of the above technical means, the number of first energy storage units connected in series in the charging system is controlled based on the control of the switch state of the fifth switch circuit. In this way, the number of first energy storage units connected can be flexibly selected according to the charging power requirements of the device to be charged, thereby improving the flexibility of charging and expanding the range of charging power output by the charging system.

[0031] In some embodiments, the second energy storage circuit includes at least one second energy storage unit; wherein: at least one second energy storage unit is connected in series and / or in parallel between the first output end of the second energy storage circuit and the second output end of the second energy storage circuit to provide a second charging power.

[0032] Through the above-mentioned technical means, the second energy storage circuit includes a plurality of second energy storage units connected in series and / or in parallel. Thus, due to the modularity of the second energy storage units, the second energy storage units can be freely increased or decreased, which facilitates the rapid connection and removal of the second energy storage units, thereby improving the flexibility of the charging power output by the charging system.

[0033] In some embodiments, at least some of the at least one second energy storage unit include a sixth switch circuit, which is connected in series between the first output terminal of the corresponding second energy storage unit and the first input terminal of the DC conversion circuit.

[0034] By means of the above technical means, the number of second energy storage units connected in series in the charging system is controlled based on the control of the switch state of the sixth switch circuit. In this way, the number of connected second energy storage units can be flexibly selected according to the charging power requirements of the device to be charged, thereby improving the flexibility of charging and expanding the range of charging power output by the charging system.

[0035] In some embodiments, the charge and discharge rate of the first energy storage circuit is greater than the charge and discharge rate of the second energy storage circuit.

[0036] Through the above technical means, the charge and discharge rate of the first energy storage circuit is greater than that of the second energy storage circuit. In this way, the second energy storage circuit that is easy to disassemble and replace uses a lower-cost battery, which reduces the number of times the charging system is disassembled and extends the service life of the charging system.

[0037] In a second aspect, an embodiment of the present application provides a charging control method, which is applied to the charging system in the above embodiment, and the method includes:

[0038] When the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply condition, the first charging power provided by the first energy storage circuit and the second charging power provided by the second energy storage circuit are used to charge the device to be charged.

[0039] Through the above technical means, when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions, it is possible to determine to use the second charging power provided by the second energy storage circuit and the first charging power provided by the first energy storage circuit to charge the device to be charged. In this way, a variety of environmental factors can be comprehensively considered, and the second energy storage circuit can be selected to charge the device to be charged. This can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging device, and increase revenue.

[0040] In some embodiments, the method also includes: when the current electricity price is lower than a first threshold or the second energy storage circuit does not meet a preset power supply condition, using a first charging power provided by the first energy storage circuit and a third charging power provided by the AC / DC conversion circuit to charge the device to be charged.

[0041] Through the above-mentioned technical means, when the current electricity price is lower than the first threshold and the second energy storage circuit does not meet the preset power supply conditions, the AC-DC conversion circuit can be used to charge the device to be charged. In this way, the electricity cost of the storage and charging machine can be reduced based on the price difference of the public power grid, thereby increasing profits.

[0042] In some embodiments, when a gun plug signal is detected, the method further includes: according to the current electricity price and the energy storage state of the second energy storage circuit, using a DC conversion circuit to perform voltage conversion on the third charging power input by the AC / DC conversion module and / or the second charging power provided by the second energy storage circuit, and output a fifth charging power; based on the fifth charging power provided by the DC conversion circuit and the first charging power provided by the first energy storage circuit, charging output is performed to the device to be charged.

[0043] Through the above technical means, when the gun plug signal is detected, the AC / DC conversion module and / or the second energy storage circuit are selected to provide charging power for the device to be charged according to the current electricity price and the energy storage state of the second energy storage circuit. In this way, the cost can be reduced and the profit can be increased by utilizing the price difference of the AC power grid at different times while meeting the charging demand of the device to be charged.

[0044] In some embodiments, when the gun plug signal is not detected, the method further includes: charging the second energy storage circuit using the AC-DC conversion circuit according to the current electricity price and the energy storage state of the second energy storage circuit.

[0045] By means of the above technical means, when the gun plug signal is not detected, the AC-DC conversion module charges the second energy storage circuit according to the energy storage state of the second energy storage circuit and the current electricity price. In this way, the second energy storage circuit can be charged when the current electricity price of the AC power grid is at a low point or at a parity period, thereby utilizing the price difference of the AC power grid at different periods to reduce costs and increase profits.

[0046] In some embodiments, the method further includes: when the charging system meets a first preset condition, controlling the DC conversion circuit and the first energy storage circuit to stop charging output to the charging circuit; or, when the charging system meets a second preset condition, controlling the AC / DC conversion module to stop charging output to the second energy storage circuit.

[0047] By means of the above technical means, when the charging system meets the first preset condition, the charging output to the charging circuit is stopped, or when the charging system meets the second preset condition, the charging output to the second energy storage circuit is stopped. In this way, the charging system or the AC power grid can stop charging when an abnormality occurs to avoid accidents caused by faults, or the charging can be stopped in time when the first energy storage circuit and the second energy storage circuit are full to avoid waste of electric energy.

[0048] In some embodiments, the charging system also includes a fourth switching circuit, and the fourth switching circuit includes a seventh switch and an eighth switch; the method also includes: when the seventh switch and the eighth switch are in an on state, the second energy storage circuit outputs a second charging power to the DC conversion circuit, or, based on the third charging power provided by the AC / DC conversion module, charges the second energy storage circuit.

[0049] Through the above technical means, the input or output of the electric energy of the second energy storage circuit is controlled by controlling the conduction or disconnection of the seventh switch and the eighth switch. In this way, the second energy storage circuit and / or the AC power grid can be flexibly selected to charge the device to be charged according to the peak-valley price difference of electricity prices, the energy storage state of the second energy storage circuit and other environmental factors. It can also supplement the electric energy for the first energy storage circuit and the second energy storage circuit when the current electricity price is at a low point or at a parity period, thereby comprehensively improving the efficiency of the charging system.

[0050] In a third aspect, an embodiment of the present application provides a charging pile, which includes a charging system as described in any one of the first aspects.

[0051] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 1 ;

[0053] Figure 2 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 2 ;

[0054] Figure 3 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 3 ;

[0055] Figure 4 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 4 ;

[0056] Figure 5 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 5 ;

[0057] Figure 6 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 6 ;

[0058] Figure 7 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 7 ;

[0059] Figure 8 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 8 ;

[0060] Fig. 9 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 9 ;

[0061] Fig.10 A schematic diagram of a charging control method according to an embodiment of the present invention;

[0062] Fig.11 A schematic diagram of the composition structure of a charging pile provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0065] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0066] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0067] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0068] The following is an introduction to the related technologies of this application.

[0069] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0070] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0071] In the embodiments of the present application, the battery may be a battery cell. A battery cell refers to a basic unit that can realize the mutual conversion between chemical energy and electrical energy, and can be used to make a battery module or a battery pack, so as to supply power to an electrical device. A battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited to this.

[0072] In the embodiment of the present application, the battery may also be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0073] As the number of new energy vehicles increases, the demand for energy supplement equipment is growing day by day. Therefore, a large number of efficient, stable, safe and reliable charging stations need to be built. Charging stations are generally equipped with integrated storage and charging equipment as charging equipment. The integrated storage and charging equipment includes a power distribution system, a charging system, an energy storage system, etc., and can charge new energy vehicles through the energy storage system or the connected power grid.

[0074] At present, there are few integrated storage and charging machines with supercharging functions. However, with the popularization of the number of new energy vehicles with supercharging, more charging piles with supercharging functions need to be built. However, the integrated storage and charging machines with supercharging functions require high electrical energy, and their electricity consumption mainly relies on the public power grid. If more integrated storage and charging machines are connected to the public power grid in an unordered manner during peak power consumption, it may bring huge challenges to the power balance of the public power grid power system and threaten the safe and stable operation of the power grid. Moreover, the electricity prices of the public power grid are different in different periods. Using the public power grid to charge new energy vehicles during peak periods will also lead to higher electricity costs, affecting the revenue of charging stations.

[0075] Based on this, the embodiment of the present application provides a charging system, a charging control method and a charging pile, which can determine to use the second charging power provided by the second energy storage circuit and the first charging power provided by the first energy storage circuit to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions. In this way, it is possible to comprehensively consider various environmental factors and preferentially select the second energy storage circuit to charge the device to be charged, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging integrated device, and increase revenue.

[0076] The present application is further described in detail below through the accompanying drawings and specific embodiments.

[0077] In one embodiment of the present application, Figure 1 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 1 .like Figure 1 As shown, the charging system includes a first energy storage circuit 101, a second energy storage circuit 103, a charging circuit 102 and an AC / DC conversion circuit 104, and at least the first energy storage circuit 101 and the charging circuit 102 are included in a storage-charging integrated device; wherein:

[0078] The first output end of the AC / DC conversion circuit 104 is connected to the first input end of the charging circuit 102 and the first output end of the second energy storage circuit 103 respectively, the second output end of the AC / DC conversion circuit 104 is connected to the first output end of the first energy storage circuit 101 and the second output end of the second energy storage circuit 103 respectively, and the second input end of the charging circuit 102 is connected to the second output end of the first energy storage circuit 101;

[0079] The first energy storage circuit 101 is configured to provide a first charging power to the charging circuit 102;

[0080] The second energy storage circuit 103 is configured to provide a second charging power to the charging circuit 102;

[0081] The AC / DC conversion circuit 104 is configured to provide a third charging power to the charging circuit 102;

[0082] The charging circuit 102 is configured to use the first charging power and the second charging power to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit 103 meets the preset power supply conditions; or, when the current electricity price is lower than the first threshold or the second energy storage circuit 103 does not meet the preset power supply conditions, use the first charging power and the third charging power to charge the device to be charged.

[0083] It should be noted that the charging system 20 includes a storage-charging integrated device 10. The storage-charging integrated device 10 may include a first energy storage circuit 101 and a charging circuit 102. In this case, the charging system 20 may be composed of the storage-charging integrated device 10 and the second energy storage circuit 103.

[0084] It should be noted that in the embodiment of the present application, the first output terminal P5 of the first energy storage circuit 101, the second output terminal P6 of the first energy storage circuit 101, the first output terminal P7 of the second energy storage circuit 103, the second output terminal P8 of the second energy storage circuit 103, the first input terminal P3 of the charging circuit 102 and the second input terminal P4 of the charging circuit 102, the first output terminal P1 of the AC-DC conversion circuit 104 and the second output terminal P2 of the AC-DC conversion circuit 104 can be respectively determined as the positive terminal or the negative terminal according to the specific structure, so as to realize that the first energy storage circuit 101, the second energy storage circuit 103 and the AC circuit 201 jointly supply power to the device to be charged 201.

[0085] In the embodiment of the present application, in the embodiment of the present application, the first energy storage circuit 101 can be a storage battery capable of storing electric energy in the charging system 20, such as a lithium iron phosphate battery, a lithium ion battery, etc. The first energy storage circuit 101 can store the AC power grid 201, or renewable energy, such as the electric energy output or converted by photovoltaic power generation equipment. Among them, the battery capacity and type of the first energy storage circuit 101 are not limited here. The first charging power provided by the first energy storage circuit 101 and the second charging power output by the second energy storage circuit 103 can be determined according to the charging power actually required by the device to be charged 201, which is generally greater than 210kW. Exemplarily, when the device to be charged 201 needs to be overcharged, the first energy storage circuit 101 can be discharged at a large rate so that the charging power output by the charging circuit 102 is greater than 360kW; or, when the device to be charged 201 needs ordinary charging or fast charging, the first energy storage circuit 101 can be discharged at a small rate so that the charging power output by the charging circuit 102 is less than 360kW.

[0086] In the embodiment of the present application, the second energy storage circuit 103 can be arranged outside the storage-charging integrated device, connected to the charging system 20 through a fixed interface on the charging system 20, and provide power to the charging system 20. Exemplarily, the second energy storage circuit 103 can be a second-use battery, or a battery of the same model as the first energy storage circuit 101, which is selected based on cost adaptation. It should be understood that the second charging power provided by the second energy storage circuit 103 varies based on different models.

[0087] In addition, the second energy storage circuit 103 meets the preset condition, which may refer to the energy storage state of the second energy storage circuit 103, that is, the state of charge (State of Charge, SOC) of the battery in the second energy storage circuit 103, or the remaining energy state (State of Energy, SOE), or other parameters that can reflect that the current remaining available power of the second energy storage circuit 103 is greater than or equal to the second threshold value, and the second threshold value is determined according to actual needs.

[0088] It should be noted that according to the load changes of the public power grid, the 24 hours of a day are divided into multiple periods such as peak, flat and valley, and different electricity prices are set for different periods. It should be understood that the current electricity price will change on different dates and different periods, and will be determined according to the charging standards.

[0089] In the embodiment of the present application, when a signal generated by a user accessing the device to be charged 201 is detected, the charging system 20 may first determine the current electricity price, obtain the energy storage state of the second energy storage circuit 103, and determine the power required to be output by the second energy storage circuit 103 according to the power output by the first energy storage circuit 101 and the power required by the device to be charged 201. Exemplarily, when the SOC of the second energy storage circuit 103 is, for example, 20%, and the current electricity price exceeds the first threshold, that is, the electricity price during the peak period, the second energy storage circuit 103 may be used preferentially together with the first energy storage circuit 101 to output the charging power through the device to be charged 201.

[0090] It should be noted that in some embodiments, under the premise of meeting the charging demand of the device to be charged 201, the device to be charged 201 can be charged by the first energy storage circuit 101 alone, or by the second energy storage circuit 103 alone. The specific adjustment can be made according to the actual situation or the user's choice.

[0091] It should be noted that the charging system 20 can determine the current electricity price according to a pre-stored table of correspondence between time periods and electricity prices, or the cloud platform connected to the charging system 20 can send the current electricity price to the charging system 20 in real time. In the embodiment of the present application, the cloud platform is connected to multiple charging systems 20, and can obtain the state parameters of the first energy storage circuit 101 and the second energy storage circuit 103 in the multiple charging systems 20, and can determine the charging time period of the first energy storage circuit 101 and the second energy storage circuit 103 according to the decision algorithm or manual interaction, as well as which device is used to provide power when charging the device to be charged 201.

[0092] In an embodiment of the present application, the AC-DC conversion circuit 104 can be arranged outside the integrated storage and charging device, and connected to the integrated storage and charging device through a fixed interface on the integrated storage and charging device. It is a device that provides electric energy to the integrated storage and charging device from the power grid side. For example, it can include a public power grid for power supply, and equipment for performing voltage conversion, AC-DC conversion, etc. on the power grid, so as to provide stable and available electric energy to the integrated storage and charging device.

[0093] It should be noted that the charging system 20 includes a storage-charging integrated device 10. The storage-charging integrated device 10 may include a first energy storage circuit 101 and a charging circuit 102. In this case, the charging system 20 may be composed of the storage-charging integrated device 10, the second energy storage circuit 103 and the AC-DC conversion circuit 104; or the storage-charging integrated device may also include a first energy storage circuit 101, a charging circuit 102 and a second energy storage circuit 103. In this case, the charging system 20 may be composed of the storage-charging integrated device and the AC-DC conversion circuit 104; or the storage-charging integrated device may also include a first energy storage circuit 101, a charging circuit 102, a second energy storage circuit 103 and an AC-DC conversion circuit 104. In this case, the charging system 20 is integrated into the storage-charging integrated device.

[0094] It should also be noted that the first charging power provided by the first energy storage circuit 101, the third charging power output by the AC / DC conversion circuit 104 and / or the second charging power output by the second energy storage circuit 103 can be determined according to the charging power actually required by the device to be charged 201.

[0095] In an embodiment of the present application, when a signal generated by a user accessing the device to be charged 201 is detected, the charging system 20 may first determine the current electricity price, obtain the energy storage status of the second energy storage circuit 103, and determine the power required to be output by the AC-DC conversion circuit 104 and / or the second energy storage circuit 103, as well as the ratio of the power output by the AC-DC conversion circuit 104 to the power output by the second energy storage circuit 103 based on the power output by the first energy storage circuit 101 and the power required by the device to be charged 201. Exemplarily, when the SOC of the second energy storage circuit 103 is, for example, 20%, and the current electricity price exceeds the first threshold, that is, the electricity price during the peak period, the second energy storage circuit 103 and the first energy storage circuit 101 can be used to output charging power through the device to be charged 201 to charge the device to be charged. If the output power of the second energy storage circuit 103 does not meet the demand, the AC-DC conversion circuit 104 can make up the remaining output power, that is, the AC-DC conversion circuit 104, the second energy storage circuit 103 and the first energy storage circuit 101 can charge the device to be charged 201 together. Alternatively, when the SOC of the second energy storage circuit 103 and / or the current electricity price does not exceed the first threshold, that is, it is equal to or lower than the first threshold, the AC-DC conversion circuit 104 and the first energy storage circuit 101 can charge the device to be charged 201 together.

[0096] It should be noted that in some embodiments, under the premise of meeting the charging demand of the device to be charged 201, the device to be charged 201 can also be charged by the first energy storage circuit 101 alone, or by the AC-DC conversion circuit 104 alone, or by the second energy storage circuit 103 alone. The specific adjustment can be made according to the actual situation or the user's choice.

[0097] The embodiment of the present application provides a charging system, which can determine to use the second charging power provided by the second energy storage circuit and the first charging power provided by the first energy storage circuit to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions. In this way, it is possible to comprehensively consider a variety of environmental factors and selectively select the second energy storage circuit to charge the device to be charged, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging device, and reduce the electricity cost of the storage and charging device based on the price difference of the public power grid, thereby increasing revenue.

[0098] In another embodiment of the present application, Figure 2 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 2 .like Figure 2 As shown, the positive output terminal of the first energy storage circuit 101 is connected to the negative output terminal of the AC-DC conversion circuit 104 and the negative output terminal of the second energy storage circuit 103 respectively, the negative output terminal of the first energy storage circuit 101 is connected to the negative input terminal of the charging circuit 102, and the positive input terminal of the charging circuit 102 is connected to the positive output terminal of the AC-DC conversion circuit 104 and the positive output terminal of the second energy storage circuit 103 respectively.

[0099] That is, in the embodiment of the present application, the first output terminal P1 of the AC / DC conversion circuit 104 may be a positive terminal, and the second output terminal P2 of the AC / DC conversion circuit 104 may be a negative terminal; the first output terminal P8 of the second energy storage circuit 103 may be a positive terminal, and the second output terminal P7 of the second energy storage circuit 103 may be a negative terminal; the first input terminal P3 of the charging circuit 102 may be a positive terminal, and the second input terminal P4 of the charging circuit 102 may be a negative terminal. The first output terminal P5 of the first energy storage circuit 101 may be a positive terminal, and the second output terminal P6 of the first energy storage circuit 101 may be a negative terminal.

[0100] Or, in some embodiments, Figure 3 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 3 .like Figure 3 As shown, the negative output terminal of the first energy storage circuit 101 is connected to the positive output terminal of the AC-DC conversion circuit 104 and the positive output terminal of the second energy storage circuit 103 respectively, the positive output terminal of the first energy storage circuit 101 is connected to the positive input terminal of the charging circuit 102, and the negative input terminal of the charging circuit 102 is connected to the negative output terminal of the AC-DC conversion circuit 104 and the negative output terminal of the second energy storage circuit 103 respectively.

[0101] In the embodiment of the present application, the first output terminal P1 of the AC / DC conversion circuit 104 may be a negative terminal, and the second output terminal P2 of the AC / DC conversion circuit 104 may be a positive terminal; the first output terminal P8 of the second energy storage circuit 103 may be a negative terminal, and the second output terminal P7 of the second energy storage circuit 103 may be a positive terminal; the first input terminal P3 of the charging circuit 102 may be a negative terminal, and the second input terminal P4 of the charging circuit 102 may be a positive terminal; the first output terminal P5 of the first energy storage circuit 101 may be a negative terminal, and the second output terminal P6 of the first energy storage circuit 101 may be a positive terminal.

[0102] It should be understood that whether each terminal in each circuit is a positive terminal or a negative terminal is determined according to the device conditions, but Figure 2 , Figure 3 In the embodiment, the second energy storage circuit 103, the AC / DC conversion circuit 104, the first energy storage circuit 101 and the charging circuit 102 are connected in series, and the output power of at least one of the second energy storage circuit 103, the AC / DC conversion circuit 104 and the first energy storage circuit 101 is added together, and the charging power is output through the charging circuit 102 to charge the device to be charged 201.

[0103] It should be noted that in this application and the following embodiments, based on Figure 2 The illustrated embodiment is described.

[0104] The embodiment of the present application provides a charging system, wherein the first energy storage circuit can be arranged on the positive side of the AC-DC conversion circuit, or on the negative side of the AC-DC conversion circuit, thereby improving the circuit flexibility in the charging system.

[0105] In another embodiment of the present application, continue to refer to Figure 1 The positive output terminal of the second energy storage circuit 103 is connected to the positive output terminal of the AC-DC conversion circuit 104, and the negative output terminal of the second energy storage circuit 103 is connected to the negative output terminal of the AC-DC conversion circuit 104, and is configured to charge the second energy storage circuit 103 based on the third charging power provided by the AC-DC conversion circuit 104, or to feed back electric energy to the AC-DC conversion circuit based on the output power of the second energy storage circuit 103.

[0106] In the embodiment of the present application, the second energy storage circuit 103 can also be integrated into the integrated storage and charging device, and its connection relationship with the first energy storage circuit 101 and the charging circuit 102 in the integrated storage and charging device refers to the aforementioned embodiment.

[0107] It should be noted that, for cost considerations, if the second energy storage circuit 103 is disposed outside the storage-charge integrated device, the second energy storage circuit 103 can be flexibly connected to or disconnected from the storage-charge integrated device through an interface, and the battery in the second energy storage circuit 103 can be replaced at any time. Due to the convenience of replacement, in this case, the battery in the second energy storage circuit 103 can use a low-cost cascade utilization battery, or the old battery replaced by other charging systems 20 can be reused.

[0108] Alternatively, if the second energy storage circuit 103 is integrated inside the storage-charging device, since replacement is inconvenient, the second energy storage circuit 103 can use a battery with a higher cost and longer life.

[0109] It should also be noted that, on the integrated storage and charging device that has integrated the second energy storage circuit 103 internally, other second energy storage circuits 103 can be connected through the external interface on the integrated storage and charging device, thereby improving the energy storage capacity of the charging system 20.

[0110] In the embodiment of the present application, the first energy storage circuit 101 and the second energy storage circuit 103 can both feed back electric energy to the AC / DC conversion circuit 104. The time for feeding back electric energy can be specified by the user or the cloud platform, or can be fed back during the peak electricity price period according to a comparison table of time periods and electricity prices.

[0111] The embodiment of the present application provides a charging system, in which a second energy storage circuit is integrated into the charging system, thereby improving the integration and flexibility of the charging system.

[0112] In some embodiments, Figure 4 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 4 .like Figure 4 As shown, the charging system 20 also includes a DC conversion circuit 105; wherein: the input end of the DC conversion circuit 105 is respectively connected to the output end of the AC-DC conversion circuit 104 and the output end of the second energy storage circuit 103, and the output end of the DC conversion circuit 105 is respectively connected to the first output end of the first energy storage circuit 101 and the first input end of the charging circuit 103.

[0113] In an embodiment of the present application, the DC conversion circuit 105 can be an isolated bidirectional DC / DC (Direct current / Direct current, DC / DC) converter, which is arranged between the circuit where the AC / DC conversion circuit 104 and the second energy storage circuit 103 are located and the circuit where the first energy storage circuit 101 and the charging circuit 102 are located, and the DC conversion circuit 105 can be arranged outside the integrated storage and charging device, or can be arranged inside the integrated storage and charging device.

[0114] In the embodiment of the present application, when the first end of the DC conversion circuit 105 is connected to the first end of the first energy storage circuit 101, and the second end of the DC conversion circuit 105 is connected to the second end of the first energy storage circuit 101, the DC conversion circuit 105 can realize DC positive and negative voltage output, that is, the DC conversion circuit 105 can adjust the direction of the output voltage in the fourth charging power output by the AC power grid without changing the current direction, and output a positive or negative voltage. When the DC conversion circuit 105 outputs a positive voltage, that is, when the voltage is output to the first end of the first energy storage circuit 101, the DC conversion circuit 105 works in a positive polarity mode; when the DC conversion circuit 105 outputs a reverse voltage, that is, when the voltage is output to the second end of the first energy storage circuit 101, the DC conversion circuit 105 works in a reverse polarity mode.

[0115] It should be noted that when the first voltage value of the device to be charged 201 is greater than the second voltage value of the first energy storage circuit 101, the working state of the DC conversion circuit 105 is a positive polarity state, and the output voltage is positive, that is, at least one or more of the first energy storage circuit 101, the second energy storage circuit 103 and the AC-DC conversion circuit 104 are connected in series, and the voltage is superimposed and output to the charging circuit 102, so that the charging circuit 102 outputs the sixth charging power to charge the device to be charged 201; or, when the first voltage value of the device to be charged 201 is less than or equal to the second voltage value of the first energy storage circuit 101, the working state of the DC conversion circuit 105 is a reverse polarity state, and the output voltage is reverse, that is, the second energy storage circuit 103 and / or the AC-DC conversion circuit 104 output a reverse voltage to the first energy storage circuit 101, offsetting the voltage output by the first energy storage circuit 101 to the charging circuit 102, that is, reducing the first charging power output by the first energy storage circuit 101, and providing it to the charging circuit 102, so that the charging circuit 102 outputs the sixth charging power.

[0116] It should also be noted that, in the embodiment of the present application, -Ua≤U1-U2≤+Ub, wherein U1 is the battery voltage of the device to be charged 201, that is, the first voltage value output by the charging circuit 102, U2 is the second voltage value output by the first energy storage circuit 101, -Ua is the limit of the negative voltage output by the DC conversion circuit 105, and +Ub is the limit of the positive voltage output by the DC conversion circuit 105.

[0117] The embodiment of the present application provides a charging system, which converts the voltage output by the AC-DC conversion circuit and / or the second energy storage circuit by setting a DC conversion circuit, so that it can be output in a positive or negative direction. In this way, compared with the first charging power output by the first energy storage circuit, the charging power output by the charging system has a wider range and higher flexibility, and can be adapted to the voltage of a variety of devices to be charged, thereby expanding the scope of application of the charging system.

[0118] In some embodiments, continue to refer to Figure 4 , the AC-DC conversion circuit includes an AC-DC conversion module 1042 and an AC power grid 1041; wherein:

[0119] The input end of the AC / DC conversion module 1042 is connected to the AC power grid 1041;

[0120] The output end of the AC-DC conversion module 1042 is connected to the input end of the second energy storage circuit 103 and the DC conversion circuit 105 respectively.

[0121] In the embodiment of the present application, the AC power grid 1041 may be a three-phase AC power grid, and its input power is generally less than or equal to 150 kW. In the embodiment of the present application, the AC power grid 1041 is connected to the AC / DC conversion module 1042, and can output AC voltage and AC current to the AC / DC conversion module 1042. Those skilled in the art can understand that the AC power grid 1041 generally refers to a system that can provide power. As an example, the AC power grid 1041 may be a power source of municipal power.

[0122] In the embodiment of the present application, the AC / DC conversion module 1042 may be an isolated bidirectional AC / DC (Alternating current / Direct current, AC / DC) converter, or a rectifier, which is a power conversion device that can convert AC power into DC power, or convert DC power into AC power. Among them, an isolation chip may also be provided in the AC / DC conversion module 1042 to isolate the AC power grid 1041 from the subsequent charging circuit 102, the device to be charged 201, etc., to prevent the AC power grid 1041 from damaging the charging system 20 and the device to be charged 201. Among them, the input power of the AC power grid 1041 is converted by the AC / DC conversion module 1042 to be used as the third charging power and output to the DC conversion circuit 105.

[0123] It should also be noted that the AC-DC conversion module 1042 can be set in the integrated storage and charging device, or can be set outside the integrated storage and charging device, depending on actual needs.

[0124] In addition, in the embodiment of the present application, if the AC-DC conversion module 1042 and the DC conversion circuit 105 are provided at the same time, in order to avoid the waste of electric energy, the output power of the AC-DC conversion module 1042 should be greater than or equal to the input power of the DC conversion circuit 105. Generally, the output power of the AC-DC conversion module 1042 is equal to the input power of the DC conversion circuit 105.

[0125] In the embodiment of the present application, the AC-DC conversion module 1042 has a small power input (e.g., less than or equal to 150 kW), and the DC conversion circuit 105 has a small power output (e.g., less than or equal to 150 kW), but the output current of the DC conversion circuit 105 is relatively large (e.g., greater than or equal to 400 A), so the current in the loop connected to the charging circuit 102 is relatively large, so that the first energy storage circuit 101 can also provide a higher power (e.g., greater than or equal to 360 kW) to the charging circuit 102 together with the DC conversion circuit 105 when the output voltage is relatively low, so that the sixth charging power provided by the charging circuit 102 meets the supercharging requirement.

[0126] The embodiment of the present application provides a charging system, wherein the AC / DC conversion circuit includes an AC power grid and an AC / DC conversion module, wherein the AC / DC conversion module can be arranged inside the storage-charging integrated device or outside the storage-charging integrated device. In this way, it is convenient for the charging system to directly connect to the AC power grid for charging, thereby improving the convenience of charging.

[0127] In another embodiment of the present application, Figure 5 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 5 .like Figure 5 As shown, the charging system 20 further includes a first switch circuit 106 and a second switch circuit 107, the first switch circuit 106 includes a first switch K1 and a second switch K2, and the second switch circuit 107 includes a third switch K3, a fourth switch K4 and a fifth switch K5; wherein:

[0128] The first switch K1 is connected in series between the second input end of the DC conversion circuit 105 and the second output end of the first energy storage circuit 101, the second switch K2 is connected in series between the first input end of the DC conversion circuit 105 and the first output end of the first energy storage circuit 101, the third switch K3 is connected in series between the first output end of the DC conversion circuit 105 and the first input end of the charging circuit 102, the fourth switch K4 is connected in series between the second output end of the first energy storage circuit 101 and the second input end of the charging circuit 102, and the fifth switch K5 is connected in series between the second output end of the DC conversion circuit 105 and the first output end of the first energy storage circuit 101.

[0129] It should be noted that Figure 5 is based on Figure 2 The embodiment shown in the figure is used as an example for explanation. It should be understood that the first switch circuit 106 can also be based on Figure 3 The embodiment shown in the figure is configured, the first switch K1 is connected in series between the negative terminal of the AC / DC conversion module 1042 and the negative input terminal of the charging circuit 102, and the second switch K2 is connected in series between the positive terminal of the first energy storage circuit 101 and the positive input terminal of the charging circuit 102. Figure 5The first switch circuit 106 shown corresponds to the first switch circuit 106 and is not shown here.

[0130] When the charging system 20 is required to charge the device 201 to be charged, the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 can be turned on at the same time, and based on the above embodiment, according to the relationship between the output voltage of the first energy storage circuit 101 and the voltage of the device 201 to be charged, the DC conversion circuit 105 can be controlled to work in a positive polarity mode or a reverse polarity mode. When working in a positive polarity mode, the sum of the first charging power, the second charging power and / or the third charging power is used as the sixth charging power to power the device 201 to be charged; or, when working in a reverse polarity mode, the first charging power after the negative second charging power and / or the third charging power are offset is used as the sixth charging power to power the device 201 to be charged. Alternatively, when the first switch K1, the second switch K2, the third switch K3, the fourth switch K4 and the fifth switch K5 are turned off at the same time, the power supply to the device 201 to be charged is stopped. When the DC conversion circuit 105 works in a positive polarity mode, the DC conversion circuit 105 performs work in a positive direction, and the directions of the output current and the output voltage are positive. The positive direction is that the output end of the DC conversion circuit 105 outputs a voltage in the direction of the charging circuit 102; or, when the DC conversion circuit 105 works in a reverse polarity mode, the DC conversion circuit 105 performs work in a negative direction, the direction of the output current is still positive, and the direction of the output voltage is reverse. The reverse direction means that the DC conversion circuit 105 outputs a voltage in the direction of the first energy storage circuit 101 via the path where the first switch K1 and the second switch K2 are located.

[0131] In the embodiment of the present application, the first switch K1 and the second switch K2 are used to control the on / off of the circuit between the DC conversion circuit 105 and the first energy storage circuit 101. Based on the above embodiment, the DC conversion circuit 105 can operate in a positive polarity mode or a reverse polarity mode according to the comparison between the output voltage of the first energy storage circuit 101 and the voltage of the device to be charged 201. When the DC conversion circuit 105 operates in a reverse polarity mode, the first switch K1 and the second switch K2 can be controlled to be closed, so that the DC conversion circuit 105 outputs a negative voltage to the first energy storage circuit 101 through the circuit between the DC conversion circuit 105 and the first energy storage circuit 101.

[0132] It should be noted that, in some embodiments, when the charging system 20 is powered on, the first switch K1 and the second switch K2 may be controlled to be always in the on state, regardless of the current working mode of the DC conversion circuit 105. In this way, the control logic may be simplified.

[0133] Alternatively, when there is no device to be charged 201 and the current electricity price is not at a peak, only the first switch K1 and the second switch K2 may be turned on, and other switches in the charging system 20 may be turned off, thereby controlling the AC grid 1041 to charge the first energy storage circuit 101. Alternatively, the first energy storage circuit 101 may be controlled to feed back electric energy to the AC grid 1041.

[0134] The embodiment of the present application provides a charging system, which controls the on and off of each switch in the first switch circuit and the second switch circuit, based on the working state of the DC conversion circuit, and charges the device to be charged together with the energy storage circuit, and controls whether the charging system charges the device to be charged and whether the AC power grid charges the energy storage circuit. In this way, not only the power application range of the device to be charged is broadened, but also the switch can be turned off when charging is not needed, reducing energy waste.

[0135] In some embodiments, Figure 6 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 6 .like Figure 6 As shown, the charging system 20 further includes a third switch circuit, and the third switch circuit includes a sixth switch K6; wherein:

[0136] One end of the sixth switch K6 is connected to the first output end of the AC / DC conversion module 1042 , and the other end of the sixth switch K6 is connected to one end of the third switch K3 .

[0137] In the embodiment of the present application, when the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are all in the on state and the second switch K2 and the fifth switch K5 are in the off state, the charging circuit 102 can charge the device to be charged 201 based on the third charging power provided by the AC / DC conversion module 1042 and / or the second charging power provided by the second energy storage circuit 103, and the specific selection is determined according to the energy storage state of the second energy storage circuit 103 and the current electricity price. Alternatively, in the current state, electric energy can be fed back to the AC power grid 1041 based on the output power of the device to be charged 201.

[0138] In the embodiment of the present application, the charging system 20 may further include a control circuit, which can detect the power of the first energy storage circuit 101. If the power of the first energy storage circuit 101 is insufficient, the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 can be controlled to be in an on state, so that only the AC grid 1041 charges the device to be charged 201 through the AC-DC conversion module 1042, or the device to be charged 201 feeds back electric energy to the AC grid 1041, thereby realizing the vehicle-to-grid (V2G) function.

[0139] The embodiment of the present application provides a charging system, which controls the charging system to charge the device to be charged, or implements the V2G function based on the device to be charged to the AC power grid by controlling the conduction or disconnection of each switch in the third switch circuit. In this way, charging can be performed according to the actual situation of the charging system and the device to be charged, thereby improving the flexibility of charging.

[0140] In some embodiments, Figure 7 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 7 .like Figure 7 As shown, the charging system 20 further includes a fourth switch circuit, and the fourth switch circuit includes a seventh switch K7 and an eighth switch K8; wherein:

[0141] The seventh switch K7 is connected in series between the second output terminal of the second energy storage circuit 103 and the second input terminal of the DC conversion circuit 105 . The eighth switch K8 is connected in series between the first output terminal of the second energy storage circuit 103 and the first input terminal of the DC conversion circuit 105 .

[0142] It should be noted that the first switch K1 to the eighth switch K8 can all be arranged in the integrated storage and charging device of the storage and charging system. In some embodiments, the AC-DC conversion module 1042 can also be arranged in the integrated storage and charging device.

[0143] In the embodiment of the present application, the seventh switch K7 and the eighth switch K8 are used to control whether the second energy storage circuit 103 outputs the second charging power to the charging circuit 102 based on their on or off state. Exemplarily, when a signal connected to the device to be charged 201 is detected, when the current electricity price is not in the peak period and / or the remaining power of the second energy storage circuit 103 does not reach k%, the control circuit controls the seventh switch K7 and the eighth switch K8 to be turned off, and according to the actual situation, the on or off state of other switches in the storage and charging integrated machine is controlled based on the above embodiment, and only the AC power grid 1041 outputs electric energy to the DC conversion circuit 105 through the AC-DC conversion module 1042, and charges the device to be charged 201 together with the first energy storage circuit 101. Alternatively, when the current electricity price is at the peak period, that is, exceeds the first threshold, and the remaining power of the second energy storage circuit 103 exceeds, the control circuit controls the seventh switch K7 and the eighth switch K8 to be turned on, and according to the actual situation, based on the aforementioned embodiment, controls the on or off state of other switches in the storage and charging machine, and the second energy storage circuit 103 and the AC power grid 1041 and the first energy storage circuit 101 jointly provide power to the device 201 to be charged, or the second energy storage circuit 103 and the first energy storage circuit 101 jointly provide power to the device 201 to be charged.

[0144] It should be noted that when the access signal of the device to be charged 201 is not detected, the current electricity price is not in the peak period, and the second energy storage circuit 103 is not in a fully charged state, the control circuit can control the seventh switch K7 and the eighth switch K8 to be turned on, and the other switches in the charging system 20 are turned off, and the AC power grid 1041 charges the second energy storage circuit 103 through the AC-DC conversion module 1042 until the access signal of the device to be charged 201 is detected, or the charging system 20 or the AC power grid 1041 fails, or the second energy storage circuit 103 is fully charged. In some embodiments, the control circuit can also control the first switch K1 and the second switch K2 to be turned on to charge the first energy storage circuit 101.

[0145] It should also be noted that the switches included in the aforementioned embodiments can all be electronic components that are turned on or off based on a driving signal to control the opening or disconnection of a circuit in the charging system 20. For example, it can be a knife switch, or a semiconductor device such as a switch tube, a triode, a transistor, an IGBT, a metal-oxide-semiconductor field-effect transistor (MOSFET or MOS tube), and no limitation is made here.

[0146] The embodiment of the present application provides a charging system, which controls the input or output of the electric energy of the second energy storage circuit by controlling the conduction or disconnection of the seventh switch and the eighth switch. In this way, the second energy storage circuit and / or the AC power grid can be flexibly selected to charge the device to be charged according to the peak-valley price difference of electricity price, the energy storage state of the second energy storage circuit and other environmental factors, and the first energy storage circuit and the second energy storage circuit can be supplemented with electric energy when the current electricity price is at a low point or at a parity period, thereby comprehensively improving the efficiency of the charging system.

[0147] In another embodiment of the present application, Figure 8 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 8 .like Figure 8 As shown, the first energy storage circuit 101 includes at least one first energy storage unit; wherein:

[0148] At least one first energy storage unit is connected in series and / or in parallel between the first output end of the first energy storage circuit 101 and the second output end of the first energy storage circuit 101 to provide a first charging power.

[0149] In the embodiment of the present application, the first energy storage circuit 101 includes one or more first energy storage units, namely, first energy storage unit 1 1014, first energy storage unit 2 1013, ..., first energy storage unit n-1 1012 and first energy storage unit n1011 (n is a positive integer), each first energy storage unit includes a positive terminal and a negative terminal, and a plurality of first energy storage units are connected in series and / or in parallel to form the first energy storage circuit 101, so that the first energy storage circuit 101 provides a first charging power. As an example, the first energy storage unit may be an electric box.

[0150] It should also be noted that the multiple first energy storage units in the first energy storage circuit 101 can be connected in parallel, or in series, or partially in series and partially in parallel, that is, connected in series-parallel mode, which is not specifically limited here. In the present application and the following embodiments, multiple first energy storage units are connected in series as an example for explanation. In this way, when there are multiple first energy storage units, the power of the first energy storage circuit 101 is the sum of the power of the multiple first energy storage units. In this way, the first energy storage circuit 101 can output a higher power to charge the device to be charged 201, and at the same time, there is no need to add a transformer or expand the transformer on the AC power grid 1041 side to meet the high-power charging demand.

[0151] In the embodiment of the present application, the number of the first energy storage units can be selected and set based on actual needs. When the charging system 20 is only used for low-power charging, the first energy storage unit can be set to one or a small number of units, which can meet the low-power charging scenario; when the charging system 20 is used for fast charging / super charging scenarios, the first energy storage unit can be set to multiple units.

[0152] In the embodiment of the present application, the number of first energy storage units in the first energy storage circuit 101 can be set according to actual needs, and the first energy storage units can be freely increased or decreased in series or in parallel.

[0153] An embodiment of the present application provides a charging system, wherein a first energy storage circuit includes a plurality of first energy storage units connected in series and / or in parallel. Thus, due to the modularity of the first energy storage units, the first energy storage units can be freely increased or decreased, thereby facilitating rapid connection and removal of the first energy storage units, thereby improving the flexibility of the charging power output by the charging system.

[0154] In some embodiments, each first energy storage unit includes at least one first energy storage battery, and each first energy storage unit is configured to provide corresponding charging power based on the electric energy of the first energy storage battery; wherein the charging power output by the first energy storage battery is less than or equal to the charging power output by the first energy storage unit, and the charging power output by the first energy storage unit is less than or equal to the charging power output by the first energy storage circuit 101.

[0155] In the embodiment of the present application, the number of first energy storage batteries in each first energy storage unit may be equal or unequal, and may be set according to specific needs. Each first energy storage unit may provide corresponding charging power based on the number of first energy storage batteries it contains. Therefore, the number of first energy storage batteries in the first energy storage unit may be set according to the different charging requirements of the device to be charged 201. It should be understood that the number of first energy storage batteries contained in different first energy storage units may be different.

[0156] In some embodiments, see Figure 8 At least some of the at least one first energy storage unit include a fifth switch circuit, and the fifth switch circuit is connected in series between the first output end of the corresponding first energy storage unit and the second output end of the AC-DC conversion module 1042.

[0157] In an embodiment of the present application, the fifth switching circuit may include multiple switches, that is, a switch may be set on the path connecting each first energy storage unit with the AC-DC conversion module 1042 and the DC conversion circuit 105 to control the number of first energy storage units connected to the charging circuit, thereby controlling the power output to the device to be charged 201.

[0158] When there is only one first energy storage unit, if the first energy storage unit includes a switch, when the switch and the second switch K2 are turned on, the first energy storage unit can be connected in series with the DC conversion circuit 105, and when the DC conversion circuit 105 is in a positive polarity or reverse polarity working state, they can jointly provide power for the charging circuit 102.

[0159] When there are multiple first energy storage units, for example, including the first energy storage unit 1 1014, the first energy storage unit 2 1013, ..., the first energy storage unit n-1 1012 and the first energy storage unit n 1011, and when the first energy storage unit 1 1014 includes a corresponding switch Kq1, the first energy storage unit 2 1013 includes a corresponding switch Kq2, the first energy storage unit n-1 1012 includes a corresponding switch Kqn-1, and the first energy storage unit n 1011 includes a corresponding switch Kqn, if the switch Kq2 is closed and the remaining switches in the other first energy storage units, that is, the remaining switches in the fifth switch circuit are turned off, the first energy storage unit 1 1014 and the first energy storage unit 2 1013 are connected in series with the DC conversion circuit 105 to jointly provide electrical energy for the charging circuit 102; or, it should be understood that if the switch Kqn is closed and the switches in the other first energy storage units are turned off, the first energy storage unit 1 1014 to the first energy storage unit n are connected in series. 1011 are connected in series with the DC conversion circuit 105 to provide power to the charging circuit 102 together.

[0160] It should be noted that the charging power input by the DC conversion circuit 105 is determined based on the corresponding control logic of the above-mentioned embodiment. In which, regardless of any time period, the first charging power of the first energy storage circuit 101 is preferentially controlled to be fully output to the charging circuit 102, and secondly, when the second energy storage circuit 103 is fully charged, the second energy storage circuit 103 is selected to output the second charging power as a supplement to the first charging power regardless of any time period, and the AC power grid 1041 is selected as a further supplement when the output power is insufficient, and finally, when the second energy storage circuit 103 is insufficient, even when the current electricity price is at the peak time, only the electric energy output by the AC power grid 1041 can be selected as a supplement to the first charging power to power the device to be charged 201.

[0161] The embodiment of the present application provides a charging system, which controls the number of first energy storage units connected in series in the charging system based on the control of the switch state of the fifth switch circuit. In this way, the number of first energy storage units connected can be flexibly selected according to the charging power requirements of the device to be charged, thereby improving the flexibility of charging and expanding the range of charging power output by the charging system.

[0162] In another embodiment of the present application, Fig. 9 A schematic diagram of the structure of a charging system provided in an embodiment of the present application Figure 9 .like Fig. 9 As shown, the second energy storage circuit 103 includes at least one second energy storage unit; wherein:

[0163] At least one second energy storage unit is connected in series and / or in parallel between the first output end of the second energy storage circuit 103 and the second output end of the second energy storage circuit 103 to provide a second charging power.

[0164] In the embodiments of the present application, Fig. 9 As shown, the second energy storage circuit 103 includes at least one second energy storage unit, and can include, for example, a second energy storage unit 1 1031, a second energy storage unit 2 1032, ..., a second energy storage unit n-1 1033, and a second energy storage unit n 1034 (n is a positive integer), each second energy storage unit includes a positive terminal and a negative terminal, and a plurality of second energy storage units are connected in series and / or in parallel to form the second energy storage circuit 103, so that the second energy storage circuit 103 provides a second charging power. As an example, the second energy storage unit can be an electric box.

[0165] It should be noted that the quantity setting strategy and connection method of the second energy storage units included in the second energy storage circuit 103 can refer to the first energy storage unit in the aforementioned embodiment. In the embodiment of the present application, multiple second energy storage units are connected in series as an example for explanation.

[0166] An embodiment of the present application provides a charging system, wherein the second energy storage circuit includes a plurality of second energy storage units connected in series and / or in parallel. Thus, due to the modularity of the second energy storage units, the second energy storage units can be freely increased or decreased, thereby facilitating rapid connection and removal of the second energy storage units, thereby improving the flexibility of the charging power output by the charging system.

[0167] In some embodiments, each second energy storage unit includes at least one second energy storage battery, and each second energy storage unit is configured to provide corresponding charging power based on the electric energy of the second energy storage battery; wherein the charging power output by the second energy storage battery is less than or equal to the charging power output by the second energy storage unit, and the charging power output by the second energy storage unit is less than or equal to the charging power output by the second energy storage circuit 103.

[0168] In the embodiment of the present application, the number of second energy storage batteries in each second energy storage unit may be equal or unequal, and may be set according to specific needs. Each second energy storage unit may provide corresponding charging power based on the number of second energy storage batteries it contains. Therefore, the number of second energy storage batteries in the second energy storage unit may be set according to the different charging requirements of the device to be charged 201. It should be understood that the number of second energy storage batteries contained in different second energy storage units may be different.

[0169] In some embodiments, continue to refer to Fig. 9 At least some of the at least one second energy storage unit include a sixth switch circuit, and the sixth switch circuit is connected in series between the first output terminal of the corresponding second energy storage unit and the first input terminal of the DC conversion circuit 105.

[0170] In an embodiment of the present application, the sixth switching circuit may include multiple switches, that is, a switch may be set on the path connecting the positive end of each second energy storage unit and the DC conversion circuit 105 to control the number of second energy storage units connected to the charging circuit, thereby controlling the power output to the device to be charged 201.

[0171] When there is one second energy storage unit, if the second energy storage unit includes a switch, when the switch and the seventh switch K7 and the eighth switch K8 are all turned on, the second energy storage unit can be connected in series with the DC conversion circuit 105, and when the DC conversion circuit 105 is in a positive polarity or reverse polarity working state, it and the first energy storage circuit 101 jointly provide electrical energy for the charging circuit 102.

[0172] When there are multiple second energy storage units, for example, including the second energy storage unit 1 1031, the second energy storage unit 2 1032, ..., the second energy storage unit n-1 1033 and the second energy storage unit n 1034, and when the second energy storage unit 1 1031 includes the corresponding switch Ka1, the second energy storage unit 2 1032 includes the corresponding switch Ka2, the second energy storage unit n-1 1033 includes the corresponding switch Kan-1, and the second energy storage unit n 1034 includes the corresponding switch Kan, if the switch Ka2 is closed and the remaining switches in the second energy storage units, that is, the remaining switches in the sixth switch circuit are turned off, the second energy storage unit 1 1031 and the second energy storage unit 2 1032 are connected in series with the DC conversion circuit 105 to jointly provide electrical energy for the charging circuit 102; or, it should be understood that if the switch Kan is closed and the switches in the remaining second energy storage units are turned off, the second energy storage units 1 1031 to the second energy storage units n-1 1033 are connected in series with the DC conversion circuit 105 to jointly provide electrical energy for the charging circuit 102; 1034 are connected in series with the DC conversion circuit 105 to provide power to the charging circuit 102 together.

[0173] It should also be noted that Fig. 9 This is an embodiment in which the second energy storage circuit 103 includes multiple second energy storage units. On the basis of this embodiment, the first energy storage circuit 101 can also be set to include multiple first energy storage units, so that the number of energy storage units connected to the charging circuit can be controlled according to the charging demand of the detected device to be charged, or according to the power supply range selected by the user on the interactive panel of the storage and charging machine, so that the power supply voltage output by the charging system 20 has a wider range.

[0174] The embodiment of the present application provides a charging system, which controls the number of second energy storage units connected in series in the charging system based on the control of the switch state of the sixth switch circuit. In this way, the number of connected second energy storage units can be flexibly selected according to the charging power requirements of the device to be charged, thereby improving the flexibility of charging and expanding the range of charging power output by the charging system.

[0175] In another embodiment of the present application, continue to refer to Fig. 9 , the charge and discharge rate of the first energy storage circuit 101 is greater than the charge and discharge rate of the second energy storage circuit 103.

[0176] In the embodiment of the present application, the charge and discharge rate may refer to the ratio of the charge and discharge current of the battery in the energy storage circuit to the rated capacity.

[0177] In the embodiment of the present application, when the second energy storage circuit 103 is arranged outside the storage-charging device, the charge and discharge rate of the first energy storage circuit 101 can be greater than or equal to 4C, and the charge and discharge rate of the second energy storage circuit 103 can be less than or equal to 1C, that is, the charge and discharge rate of the first energy storage circuit 101 is greater than the charge and discharge rate of the second energy storage circuit 103. This arrangement is to enable the second energy storage circuit 103 to use batteries with shorter life but lower cost. Since the second energy storage circuit 103 is connected to the storage-charging device through an external interface, it is easy to replace. The first energy storage circuit 101 integrated in the storage-charging device uses batteries with higher cost but longer life. In this way, the number of times the charging system 20 is disassembled and repaired and the battery is replaced can be reduced, thereby reducing the maintenance cost of the charging system 20.

[0178] The embodiment of the present application provides a charging system, wherein the charge and discharge rate of the first energy storage circuit is greater than the charge and discharge rate of the second energy storage circuit. In this way, the second energy storage circuit that is easy to disassemble and replace uses a lower-cost battery, which reduces the number of times the charging system is disassembled and prolongs the service life of the charging system.

[0179] In some embodiments, Figure 8 , Fig. 9 As shown, the charging system may further include a control circuit 108 and a communication circuit 109, wherein:

[0180] The control circuit 108 may also be referred to as a control unit of the charging system 20, and may include a microcontroller unit (MCU), a sensor, a switch circuit and other devices. The control circuit 108 is connected to the first energy storage circuit, the second energy storage circuit, the DC conversion circuit, the charging circuit and each switch in the charging system 20, and is configured to send a drive signal to each switch, and control the on or off of each switch based on different level states of the drive signal, and monitor, control and manage the charging system 20 based on the received state parameters of each circuit in the charging system 20.

[0181] In the embodiment of the present application, the control circuit 108 can also be used to detect and monitor the current and voltage conditions of each circuit in the charging system 20, and to issue an alarm in time when an abnormality occurs.

[0182] It should also be noted that the control circuit 108 can also be connected to the interactive interface of the charging system 20, and based on the operation selected by the user in the interactive interface, generate a drive signal to control the opening and closing state of each switch, so as to charge the device to be charged 201 based on the charging mode required by the user, or feed electric energy back to the power grid.

[0183] In the embodiment of the present application, the communication circuit 109 can also be called a wireless communication module, which has a communication function and can receive the state parameters of each module in the charging system 20 collected by the control circuit 108, such as input current, output current, input voltage, output voltage and other parameters, and transmit these state parameters to the cloud platform.

[0184] In the embodiment of the present application, the communication circuit 109 can also receive a control signal from the cloud platform and send it to the control circuit 108, so that the control circuit 108 can generate a drive signal based on the control signal to control the opening and closing of each switch. The control signal can be generated based on the user's operation on the interactive interface of the cloud platform. For example, the user can perform batch operations on the charging system 20 by selecting different charging modes or discharging modes to the power grid.

[0185] In another embodiment of the present application, the present application embodiment provides a charging control method, which is applied to the charging system in the above embodiment. The method may include:

[0186] When the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply condition, the first charging power provided by the first energy storage circuit and the second charging power provided by the second energy storage circuit are used to charge the device to be charged.

[0187] The embodiment of the present application provides a charging control method, which can determine to use the second charging power provided by the second energy storage circuit and the first charging power provided by the first energy storage circuit to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply conditions. In this way, it is possible to comprehensively consider a variety of environmental factors and selectively select the second energy storage circuit to charge the device to be charged, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging device, and increase revenue.

[0188] In some embodiments, the method may also include: when the current electricity price is lower than a first threshold or the second energy storage circuit does not meet a preset power supply condition, using a first charging power provided by the first energy storage circuit and a third charging power provided by the AC / DC conversion circuit to charge the device to be charged.

[0189] In some embodiments, the charging system also includes an AC-DC conversion circuit, and the method may further include: an AC-DC conversion circuit, configured to provide a third charging power to the charging circuit; the charging circuit is also configured to use the first charging power and the third charging power to output charging to the device to be charged when the current electricity price is lower than the first threshold or the second energy storage circuit does not meet the preset power supply conditions.

[0190] In some embodiments, Figure 4 As shown, the AC / DC conversion circuit includes an AC / DC conversion module and an AC power grid; the method also includes: an AC / DC conversion module configured to perform AC / DC conversion on the fourth charging power input from the AC power grid and output a third charging power.

[0191] The embodiment of the present application provides a charging control method, wherein the AC / DC conversion module performs AC / DC conversion on the fourth charging power input from the AC power grid, and then outputs the third charging power to the DC conversion circuit. In this way, the AC power output from the AC power grid can be converted into DC power for charging, and the loss of AC power grid power can be avoided as much as possible.

[0192] In some embodiments, when a gun insertion signal is detected, the method further includes:

[0193] According to the current electricity price and the energy storage state of the second energy storage circuit, the DC conversion circuit is used to perform voltage conversion on the third charging power input by the AC-DC conversion module and / or the second charging power provided by the second energy storage circuit, and output a fifth charging power;

[0194] Based on the fifth charging power provided by the DC conversion circuit and the first charging power provided by the first energy storage circuit, charging output is performed to the device to be charged.

[0195] In the embodiment of the present application, when the gun plug signal is detected, that is, when the signal of the device to be charged is detected, the control circuit determines whether the current electricity price is in the peak period, and the energy storage state of the second energy storage circuit. Exemplarily, if the current electricity price is in the peak period, and the SOC of the second energy storage circuit, the value can be 20, then only the second charging power provided by the second energy storage circuit is input to the DC conversion circuit, and the sixth charging power is output; if the current electricity price is in the valley or flat period, then the second energy storage circuit and the AC power grid can be used for power supply, or only the second energy storage circuit, or only the AC power grid can be used for power supply according to the energy storage state of the second energy storage circuit, the user's choice, or the charging power required by the device to be charged; if the SOC of the second energy storage circuit is less than, then the AC power grid will be used to power the device to be charged regardless of the current electricity price in any period of time.

[0196] It should be noted that the control circuit monitors the energy storage state of the second energy storage circuit in real time. If the energy storage state drops below during the process of the second energy storage circuit outputting the second charging power to the DC conversion circuit, it gradually switches to the AC power grid to power the device to be charged to ensure the smooth completion of charging.

[0197] The embodiment of the present application provides a charging control method, which, when a gun plug signal is detected, selects an AC / DC conversion module and / or a second energy storage circuit to provide charging power for the device to be charged according to the current electricity price and the energy storage state of the second energy storage circuit. In this way, the cost can be reduced and the profit can be increased by utilizing the price difference of the AC power grid at different times while meeting the charging demand of the device to be charged.

[0198] In some embodiments, when no gun insertion signal is detected, the method may further include:

[0199] According to the current electricity price and the energy storage state of the second energy storage circuit, the second energy storage circuit is charged by using the AC-DC conversion circuit.

[0200] In an embodiment of the present application, when the plug-in signal is not detected, that is, when the signal of the device to be charged is not detected, if the current electricity price is at a parity or off-peak period, the energy storage state of the second energy storage circuit can be detected. If the second energy storage circuit is not in a fully charged state, the seventh switch and the eighth switch can be controlled to open to charge the second energy storage circuit until the second energy storage circuit is fully charged or the current electricity price is switched to the peak period electricity price.

[0201] It should be noted that when the gun plug signal is not detected, if the current electricity price is at parity or off-peak hours, the control circuit can also control the first switch and the second switch to open, and the third switch, the fourth switch and the fifth switch to turn off, to charge the first energy storage circuit. The judgment logic can refer to the judgment logic of the second energy storage circuit.

[0202] The embodiment of the present application provides a charging control method, when the gun plug signal is not detected, the AC-DC conversion module charges the second energy storage circuit according to the energy storage state of the second energy storage circuit and the current electricity price. In this way, the second energy storage circuit can be charged when the current electricity price of the AC power grid is at a low point or at parity, thereby reducing costs and increasing profits by utilizing the price difference of the AC power grid at different times.

[0203] In some embodiments, the method may further include:

[0204] When the charging system meets the first preset condition, the DC conversion circuit and the first energy storage circuit are controlled to stop charging output to the charging circuit; or, when the charging system meets the second preset condition, the AC / DC conversion module is controlled to stop charging output to the second energy storage circuit.

[0205] In an embodiment of the present application, the first preset condition may include: national standard charging cut-off conditions, such as the charging cut-off conditions sent to the charging system when the device to be charged detects that it is fully charged, cut-off conditions such as over-temperature or over-voltage of the battery, the first energy storage circuit or the second energy storage circuit in the device to be charged, and may also include fault cut-off conditions caused by a fault in the charging system, or other conditions that cause the charging of the device to be charged to end normally or abnormally, which are not specifically limited here.

[0206] In the embodiment of the present application, the second preset condition may include: fault cut-off conditions such as over-temperature, over-current, under-voltage or over-voltage of the second energy storage circuit, and other components in the charging system, such as the cut-off conditions of the power module (including the DC conversion circuit and the AC conversion circuit), the cut-off conditions of the first energy storage circuit, and may also include the cut-off condition of monitoring that the second energy storage circuit is fully charged, or other conditions that cause the charging of the second energy storage circuit to end normally or abnormally, which are not specifically limited here.

[0207] The embodiment of the present application provides a charging control method, which stops charging output to the charging circuit when the charging system meets the first preset condition, or stops charging output to the second energy storage circuit when the charging system meets the second preset condition. In this way, the charging system or the AC power grid can stop charging when an abnormality occurs to avoid accidents caused by faults, or stop charging in time when the first energy storage circuit and the second energy storage circuit are full to avoid waste of electric energy.

[0208] In some embodiments, the charging system further includes a fourth switch circuit, the fourth switch circuit includes a seventh switch and an eighth switch; the method may further include:

[0209] When the seventh switch and the eighth switch are in the on state, the second energy storage circuit outputs the second charging power to the DC conversion circuit, or charges the second energy storage circuit based on the third charging power provided by the AC-DC conversion module.

[0210] In some embodiments, Figure 5 As shown, the first switch circuit includes a first switch K1 and a second switch K2, and the second switch circuit includes a third switch K3, a fourth switch K4 and a fifth switch K5; the method further includes:

[0211] When the first switch, the second switch, the third switch, the fourth switch and the fifth switch are all in the on state, the DC conversion circuit operates in a reverse polarity working state, and the charging power provided by the DC conversion circuit is fed back to the first energy storage circuit, so that the charging circuit can charge the device to be charged based on the first charging power provided by the first energy storage circuit; or, when the third switch, the fourth switch and the fifth switch are in the on state, and the first switch and the second switch are both in the off state, the DC conversion circuit operates in a positive polarity working state, so that the charging circuit can charge the device to be charged based on the charging power provided by the DC conversion circuit and the first charging power provided by the first energy storage circuit; or, when the third switch, the fourth switch and the fifth switch are all in the off state and the first switch and the second switch are in the on state, the first energy storage circuit is charged based on the charging power provided by the AC / DC conversion module, or electric energy is fed back to the AC power grid based on the output power of the first energy storage circuit.

[0212] In some embodiments, Figure 6 As shown, the charging system further includes a third switch circuit, and the third switch circuit includes a sixth switch K6; the method further includes:

[0213] When the first switch, the third switch, the fourth switch and the sixth switch are all in the on state and the second switch and the fifth switch are in the off state, the charging circuit can charge the device to be charged based on the charging power provided by the AC / DC conversion module, or feed back electrical energy to the AC power grid based on the output power of the device to be charged.

[0214] In some embodiments, Figure 8 As shown, the first energy storage circuit includes at least one first energy storage unit, and at least part of the at least one first energy storage unit includes a fifth switching circuit; the method may also include: when the fifth switching circuit is in an on state, connecting in series at least one first energy storage unit in the charging circuit where the second switch is located to provide a first charging power.

[0215] In some embodiments, Fig. 9 As shown, the second energy storage circuit includes at least one second energy storage unit, and at least part of the at least one second energy storage unit includes a sixth switching circuit; the method may also include: when the sixth switching circuit is in an on state, connecting in series at least one second energy storage unit in the charging circuit where the seventh switch and the eighth switch are located to provide a second charging power.

[0216] The embodiment of the present application provides a charging control method, which controls the input or output of the electric energy of the second energy storage circuit by controlling the conduction or disconnection of the seventh switch and the eighth switch. In this way, the second energy storage circuit and / or the AC power grid can be flexibly selected to charge the device to be charged according to the peak-valley price difference of electricity prices, the energy storage state of the second energy storage circuit and other environmental factors, and the first energy storage circuit and the second energy storage circuit can be supplemented with electric energy when the current electricity price is at a low or parity period, thereby comprehensively improving the efficiency of the charging system.

[0217] In another embodiment of the present application, Fig.10 A schematic diagram of the steps of a charging control method provided in an embodiment of the present application. Fig.10 As shown, the method can be applied to the charging system in the aforementioned embodiment. Based on the aforementioned embodiment, the method may include:

[0218] S301, start.

[0219] S302, standby, detect gun insertion signal.

[0220] S303: Is the gun properly inserted and is the communication with the device to be charged normal?

[0221] If the gun is inserted in place and the communication with the device to be charged is normal, then continue to step S304. If any of the conditions are not met, then continue to step S306.

[0222] S304, entering charging mode.

[0223] It should be noted that after entering the charging mode, the control circuit needs to first determine the energy storage status of the second energy storage circuit, whether the current electricity price is the peak electricity price, and based on factors such as the charging power required by the device to be charged, based on the judgment logic in the aforementioned embodiment, select the AC power grid, or the second energy storage circuit, or the AC power grid and the energy storage circuit to jointly provide power for the device to be charged.

[0224] In an embodiment of the present application, the charging mode may refer to a mode in which the first energy storage circuit, the second energy storage circuit and / or the AC power grid jointly supply power to the device to be charged through the charging circuit.

[0225] Among them, the first energy storage circuit is composed of high-power batteries, and the battery charge and discharge rate of the first energy storage circuit is ≥4C. When charging, the first energy storage circuit is connected in series in the high-voltage power supply circuit, and the first energy storage circuit can achieve high-rate discharge (≥4C), and perform high-power charging (charging power ≥360kW) on the device to be charged to achieve supercharging. The first energy storage circuit can also achieve low-rate discharge (<4C) and fast charge the device to be charged (charging power ≤360kW).

[0226] The battery charge and discharge rate of the second energy storage circuit is ≤1C. The AC / DC conversion module, that is, the isolated bidirectional AC / DC, has a low power input (≤150kW), and the DC conversion circuit, that is, the isolated bidirectional DC / DC, has a low power output (≤150kW), but the isolated bidirectional DC / DC has a high current output (≥400A), so the charging power given by the charging circuit to the device to be charged is high power (charging power ≤360kW).

[0227] It should be noted that the output power of the isolated bidirectional AC / DC should be ≥ the input power of the isolated bidirectional DC / DC. Generally, the power of the isolated bidirectional AC / DC is equal to the power of the isolated bidirectional DC / DC.

[0228] In addition, the ratio of the output power of the isolated bidirectional DC / DC to the output power of the first energy storage circuit is not greater than 1:4, so as to realize the function of small power input and high power output.

[0229] It should also be noted that the second energy storage circuit can be placed inside the storage-charging device or outside the storage-charging device. The second energy storage circuit can be a second-use battery. When the second energy storage circuit uses a second-use battery, it is placed outside the storage-charging device.

[0230] In the embodiment of the present application, the second energy storage circuit can ensure that when the current electricity price does not exceed the first threshold, that is, when the electricity price is not at the peak of the power grid, the charging system can charge the device to be charged without taking electricity from the AC power grid. During charging, energy is transferred from the second energy storage circuit through the isolated bidirectional DC / DC to charge the device to be charged together with the first energy storage circuit.

[0231] In the embodiment of the present application, when entering the charging mode, the isolated bidirectional DC / DC can be powered by the second energy storage circuit to charge the device to be charged. When the power of the second energy storage circuit is insufficient (SOC≤k%, for example: k% is 20%), the AC grid powers the isolated bidirectional DC / DC through the isolated bidirectional AC / DC to charge the device to be charged.

[0232] S305, has the first preset condition been met?

[0233] The control circuit can monitor the charging system in real time to determine whether it meets the first preset condition. If so, continue to execute step S309; ​​if not, return to execute step S304.

[0234] S306, Is the current electricity price in the grid valley price or parity period?

[0235] The control circuit can determine whether the current electricity price is in a low or flat period according to the instructions issued by the cloud platform or according to a pre-stored time period and electricity price comparison table. If so, continue to execute step S307; if not, return to execute step S302.

[0236] S307, entering the second energy storage circuit energy replenishment mode.

[0237] S308, is the second preset condition met?

[0238] If yes, continue to execute step S302; if no, continue to execute step S307.

[0239] S309, end.

[0240] The embodiment of the present application provides a charging control method, which can determine the use of the third charging power provided by the AC-DC conversion circuit and / or the second charging power provided by the second energy storage circuit to charge the device to be charged according to the current electricity price and the energy storage state of the second energy storage circuit. In this way, a variety of environmental factors can be comprehensively considered, and the AC-DC conversion circuit and / or the second energy storage circuit can be preferentially selected to charge the device to be charged, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the charging system, and increase revenue.

[0241] In another embodiment of the present application, Fig.11 This is a schematic diagram of the composition structure of a charging pile provided in an embodiment of the present application. Fig.11 As shown, the charging pile 40 includes the charging system 20 in the aforementioned embodiment.

[0242] In the embodiment of the present application, the charging pile 40 may include the charging system 20 in the aforementioned embodiment, and may also include other devices for interacting with the user, as well as supporting components, etc., which are not specifically limited here.

[0243] In some embodiments, the charging system may further include a charging gun, an output end of which is connected to the device to be charged, and the device to be charged 201 is charged through the charging gun according to the first charging power provided by the first energy storage circuit, the third charging power provided by the AC-DC conversion circuit and / or the second charging power provided by the second energy storage circuit.

[0244] It should be noted that in the embodiment of the present application, the charging circuit and / or the charging gun can be arranged in the charging system 20, or can be arranged outside the charging system 20, and connected to the charging system 20 when the device to be charged 201 needs to be charged, which is not specifically limited here.

[0245] In some embodiments, the charging system 20 may further include a cloud platform, which is connected to multiple charging systems 20 and is configured to receive status parameters of the charging system 20 and display them to operators on the cloud platform side; alternatively, a control signal may be sent to the charging system 20 to control the on or off of each switch in the charging system 20, thereby further controlling the charging and discharging of the second energy storage circuit, the first energy storage circuit, and the AC power grid.

[0246] The embodiment of the present application provides a charging pile, which can determine whether to use the third charging power provided by the AC-DC conversion circuit and / or the second charging power provided by the second energy storage circuit to charge the device to be charged, based on whether the current electricity price is higher than the first threshold and whether the second energy storage circuit meets the preset power supply conditions. In this way, it is possible to comprehensively consider a variety of environmental factors and selectively select the AC-DC conversion circuit and / or the second energy storage circuit to charge the device to be charged, which can not only alleviate the power supply pressure of the public power grid power system during peak power consumption periods, but also achieve peak shaving and valley filling, reduce the electricity cost of the storage and charging device, and increase revenue.

[0247] It should be understood that those skilled in the art should understand that the present application can be implemented in the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Moreover, the present application can be implemented in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0248] It should also be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial numbers of the above-mentioned steps / processes does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0249] It should be noted that, in this application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0250] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0251] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in each embodiment of the present application, each functional unit may be fully integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0252] The above is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A charging system, characterized in that: The charging system includes a first energy storage circuit, a second energy storage circuit, a charging circuit, an AC-DC conversion circuit and a DC conversion circuit, and at least the first energy storage circuit and the charging circuit are included in a storage-charging integrated device; wherein: The first output end of the AC / DC conversion circuit is connected to the first output end of the second energy storage circuit, the second output end of the AC / DC conversion circuit is connected to the first output end of the first energy storage circuit and the second output end of the second energy storage circuit respectively, and the second input end of the charging circuit is connected to the second output end of the first energy storage circuit; The input end of the DC conversion circuit is connected to the output end of the AC-DC conversion circuit and the output end of the second energy storage circuit respectively, and the output end of the DC conversion circuit is connected to the first output end of the first energy storage circuit and the first input end of the charging circuit respectively; The first energy storage circuit is configured to provide a first charging power to the charging circuit; The second energy storage circuit is configured to provide a second charging power to the charging circuit; The AC / DC conversion circuit is configured to provide a third charging power to the charging circuit; The charging circuit is configured to use the first charging power and the second charging power to charge the device to be charged when the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply condition; or, when the current electricity price is lower than the first threshold or the second energy storage circuit does not meet the preset power supply condition, use the first charging power and the third charging power to charge the device to be charged; The charging system further includes a first switch circuit and a second switch circuit, the first switch circuit includes a first switch and a second switch, and the second switch circuit includes a third switch, a fourth switch and a fifth switch; wherein: The first switch is connected in series between the second input end of the DC conversion circuit and the second output end of the first energy storage circuit, the second switch is connected in series between the first input end of the DC conversion circuit and the first output end of the first energy storage circuit, the third switch is connected in series between the first output end of the DC conversion circuit and the first input end of the charging circuit, the fourth switch is connected in series between the second output end of the first energy storage circuit and the second input end of the charging circuit, and the fifth switch is connected in series between the second output end of the DC conversion circuit and the first output end of the first energy storage circuit.

2. The charging system according to claim 1, characterized in that: The positive output terminal of the first energy storage circuit is connected to the negative output terminal of the AC-DC conversion circuit and the negative output terminal of the second energy storage circuit respectively, the negative output terminal of the first energy storage circuit is connected to the negative input terminal of the charging circuit, and the positive input terminal of the charging circuit is connected to the positive output terminal of the AC-DC conversion circuit and the positive output terminal of the second energy storage circuit respectively; Alternatively, the negative output terminal of the first energy storage circuit is connected to the positive output terminal of the AC / DC conversion circuit and the positive output terminal of the second energy storage circuit respectively, the positive output terminal of the first energy storage circuit is connected to the positive input terminal of the charging circuit, and the negative input terminal of the charging circuit is connected to the negative output terminal of the AC / DC conversion circuit and the negative output terminal of the second energy storage circuit respectively.

3. The charging system according to claim 1, characterized in that: The positive output terminal of the second energy storage circuit is connected to the positive output terminal of the AC-DC conversion circuit, and the negative output terminal of the second energy storage circuit is connected to the negative output terminal of the AC-DC conversion circuit, and is configured to charge the second energy storage circuit based on a third charging power provided by the AC-DC conversion circuit, or to feed back electric energy to the AC-DC conversion circuit based on the output power of the second energy storage circuit.

4. The charging system according to claim 1, characterized in that: The AC / DC conversion circuit includes an AC / DC conversion module and an AC power grid; wherein: The input end of the AC / DC conversion module is connected to the AC power grid; The output end of the AC-DC conversion module is connected to the output end of the second energy storage circuit and the input end of the DC conversion circuit respectively.

5. The charging system according to claim 1, characterized in that: The charging system further includes a third switch circuit, and the third switch circuit includes a sixth switch; wherein: One end of the sixth switch is connected to the first output end of the AC / DC conversion module, and the other end of the sixth switch is connected to one end of the third switch.

6. The charging system according to claim 4, characterized in that: The charging system further includes a fourth switch circuit, and the fourth switch circuit includes a seventh switch and an eighth switch; wherein: The seventh switch is connected in series between the second output end of the second energy storage circuit and the second input end of the DC conversion circuit, and the eighth switch is connected in series between the first output end of the second energy storage circuit and the first input end of the DC conversion circuit.

7. The charging system according to claim 4, characterized in that: The first energy storage circuit includes at least one first energy storage unit; wherein: The at least one first energy storage unit is connected in series and / or in parallel between the first output end of the first energy storage circuit and the second output end of the first energy storage circuit to provide the first charging power.

8. The charging system according to claim 7, characterized in that: At least some of the at least one first energy storage unit include a fifth switch circuit, and the fifth switch circuit is connected in series between the first output end of the corresponding first energy storage unit and the second output end of the AC-DC conversion module.

9. The charging system according to claim 4, characterized in that: The second energy storage circuit includes at least one second energy storage unit; wherein: The at least one second energy storage unit is connected in series and / or in parallel between the first output end of the second energy storage circuit and the second output end of the second energy storage circuit to provide the second charging power.

10. The charging system according to claim 9, characterized in that: At least some of the at least one second energy storage unit include a sixth switch circuit, and the sixth switch circuit is connected in series between the first output terminal of the corresponding second energy storage unit and the first input terminal of the DC conversion circuit.

11. The charging system according to any one of claims 1 to 10, characterized in that: The charge and discharge rate of the first energy storage circuit is greater than the charge and discharge rate of the second energy storage circuit.

12. A charging control method, characterized in that: Applied to the charging system according to any one of claims 1 to 11, the method comprises: When the current electricity price is higher than the first threshold and the second energy storage circuit meets the preset power supply condition, the first charging power provided by the first energy storage circuit and the second charging power provided by the second energy storage circuit are used to charge the device to be charged.

13. The charging control method according to claim 12, characterized in that: The method further comprises: When the current electricity price is lower than the first threshold or the second energy storage circuit does not meet the preset power supply condition, the first charging power provided by the first energy storage circuit and the third charging power provided by the AC-DC conversion circuit are used to charge the device to be charged.

14. The charging control method according to claim 12, characterized in that: When a gun insertion signal is detected, the method further includes: According to the current electricity price and the energy storage state of the second energy storage circuit, the DC conversion circuit is used to perform voltage conversion on the third charging power input by the AC-DC conversion module and / or the second charging power provided by the second energy storage circuit, and output a fifth charging power; Based on the fifth charging power provided by the DC conversion circuit and the first charging power provided by the first energy storage circuit, charging output is performed to the device to be charged.

15. The charging control method according to claim 14, characterized in that: When no gun insertion signal is detected, the method further includes: The second energy storage circuit is charged by using an AC-DC conversion circuit according to the current electricity price and the energy storage state of the second energy storage circuit.

16. The charging control method according to any one of claims 12 to 15, characterized in that: The method further comprises: When the charging system meets a first preset condition, the DC conversion circuit and the first energy storage circuit are controlled to stop charging output to the charging circuit; or, When the charging system meets a second preset condition, the AC-DC conversion module is controlled to stop charging the second energy storage circuit.

17. The charging control method according to any one of claims 12 to 15, characterized in that: The charging system further includes a fourth switch circuit, wherein the fourth switch circuit includes a seventh switch and an eighth switch; and the method further includes: When the seventh switch and the eighth switch are in the on state, the second energy storage circuit outputs the second charging power to the DC conversion circuit, or charges the second energy storage circuit based on the third charging power provided by the AC-DC conversion module.

18. A charging pile, characterized in that: The charging pile comprises a charging system according to any one of claims 1 to 11.

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