Storage and charging integrated device, charging pile and charging system

Abstract

The utility model discloses a storage and charging integrated device, a charging pile and a charging system. The storage and charging integrated device comprises at least two energy storage circuits, at least one first switching circuit and a charging circuit. The at least one first switch circuit is connected between the at least two energy storage circuits and is configured to respond to the received driving signal, so that the at least two energy storage circuits are connected in series and / or in parallel, and the at least two energy storage circuits can provide first charging power for the charging circuit; the charging circuit is connected with the AC-DC conversion circuit and the at least two energy storage circuits, and the AC-DC conversion circuit is configured to convert received external power into second charging power provided for the charging circuit. And the charging circuit is configured to perform charging output on the to-be-charged device based on the first charging power provided by the at least two energy storage circuits and / or the second charging power provided by the AC / DC conversion circuit. Therefore, the output voltage range of the storage and charging integrated device can be expanded, and the utilization rate of the charging pile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, and in particular to a storage-charging integrated device, a charging pile and a charging system. Background Art

[0002] As the number of new energy vehicles increases, the requirements for charging facilities are getting higher and higher. The integrated storage and charging device integrates energy storage and charging functions, which can adjust the power load and increase long-term benefits. At present, the integrated storage and charging device has been widely used in charging stations for new energy vehicles.

[0003] Considering the vehicle model requirements of high-voltage platforms, electric vehicles have increasingly higher requirements for the output voltage range of charging piles. However, the output voltage of charging piles in related technologies is usually between 200V and 500V, which cannot meet the vehicle model requirements of high-voltage platforms and reduces the utilization rate of charging piles. Utility Model Content

[0004] The utility model proposes a storage-charging integrated device, a charging pile and a charging system. Without the need for a DC conversion circuit, the output voltage range of the storage-charging integrated device can be expanded, so that the storage-charging integrated device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the utilization rate of the charging pile.

[0005] The technical solution of the utility model is achieved in this way:

[0006] In a first aspect, an embodiment of the utility model provides a storage-charging integrated device, the storage-charging integrated device comprising at least two energy storage circuits, at least one first switch circuit and a charging circuit; wherein:

[0007] At least one first switch circuit is connected between at least two energy storage circuits, and the at least one first switch circuit is configured to connect the at least two energy storage circuits in series and / or in parallel in response to a received drive signal, and the at least two energy storage circuits can provide a first charging power to the charging circuit;

[0008] The charging circuit is respectively connected to the AC / DC conversion circuit and at least two energy storage circuits. The AC / DC conversion circuit is configured to convert the received external power into a second charging power provided to the charging circuit. The charging circuit is configured to output charging to the device to be charged based on the first charging power provided by the at least two energy storage circuits and / or the second charging power provided by the AC / DC conversion circuit.

[0009] Through the above-mentioned technical means, the charging circuit outputs charging to the device to be charged based on the first charging power provided by at least two energy storage circuits and / or the second charging power provided by the AC-DC conversion circuit, so that the output voltage range of the storage-charging device can be expanded. Moreover, since at least two energy storage circuits can output a higher first charging power, the storage-charging device can output a high-power charging that meets the charging demand based on the lower power provided by the external power, thereby improving the charging efficiency of the charging pile. In addition, no DC conversion circuit is required in the storage-charging device, which reduces the cost of the storage-charging device. At least two energy storage circuits are controlled to be connected in series or in parallel through at least one first switching circuit, so that the output voltage of at least two energy storage circuits can be changed, further expanding the output voltage range of the storage-charging device, so that the storage-charging device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile, and further improving the utilization rate of the charging pile.

[0010] In some embodiments, at least two energy storage circuits include a first energy storage circuit and a second energy storage circuit, and the first switch circuit includes a first switch, a second switch and a third switch; wherein: the first output end of the first energy storage circuit and the first output end of the second energy storage circuit are connected through the first switch; the second output end of the first energy storage circuit and the second output end of the second energy storage circuit are connected through the second switch; the second output end of the first energy storage circuit and the first output end of the second energy storage circuit are connected through the third switch.

[0011] Through the above-mentioned technical means, by controlling the conduction or disconnection of the first switch, the second switch and the third switch, the first energy storage circuit and the second energy storage circuit can be controlled to be connected in series or in parallel, and the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, thereby expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile, and further improving the utilization rate of the charging pile; in addition, no DC conversion circuit is required in the integrated storage and charging device, thereby reducing the cost of the integrated storage and charging device.

[0012] In some embodiments, the first switch and the second switch are both in an off state and the third switch is in an on state, so that the first energy storage circuit and the second energy storage circuit are connected in series; or, the first switch and the second switch are both in an on state and the third switch is in an off state, so that the first energy storage circuit and the second energy storage circuit are connected in parallel.

[0013] Through the above-mentioned technical means, by controlling the on or off of the first switch, the second switch and the third switch, the first energy storage circuit and the second energy storage circuit can be controlled to be connected in series or in parallel, and the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, thereby expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged.

[0014] In some embodiments, the integrated storage and charging device also includes a second switch circuit, and the second switch circuit includes a fourth switch, a fifth switch and a sixth switch; wherein: one end of the fourth switch is connected to the first output of the AC / DC conversion circuit, and the other end of the fourth switch is connected to the first input of the charging circuit; one end of the fifth switch is respectively connected to the first output of the first energy storage circuit and the second output of the AC / DC conversion circuit, and the other end of the fifth switch is respectively connected to the second output of the second energy storage circuit and one end of the sixth switch; the other end of the sixth switch is connected to the second input of the charging circuit.

[0015] Through the above technical means, by controlling the on or off of the fourth switch, the fifth switch and the sixth switch, at least two energy storage circuits and / or the AC / DC conversion circuit are controlled to charge the device to be charged. In this way, the on and off of the charging circuit can be controlled according to the situation, thereby reducing the power consumption of the storage and charging device.

[0016] In some embodiments, the fourth switch and the sixth switch are both in the on state and the fifth switch is in the off state, and the charging circuit is also configured to jointly output charging to the device to be charged based on a first charging power provided by at least two energy storage circuits and a second charging power provided by the AC / DC conversion circuit.

[0017] Through the above-mentioned technical means, by both the fourth switch and the sixth switch being in the on state and the fifth switch being in the off state, at least two energy storage circuits and the AC-DC conversion circuit can be controlled to jointly charge the device to be charged, and based on the on or off of each switch in the first switch circuit, the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, thereby expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile, and further improving the utilization rate of the charging pile; in addition, no DC conversion circuit is required in the integrated storage and charging device, thereby reducing the cost of the integrated storage and charging device.

[0018] In some embodiments, the integrated storage and charging device also includes a third switch circuit, and the third switch circuit includes a seventh switch, an eighth switch and a ninth switch; wherein: one end of the seventh switch is connected to the first output end of the first energy storage circuit, and the other end of the seventh switch is respectively connected to the first output end of the AC / DC conversion circuit and one end of the fourth switch; one end of the eighth switch is connected to the first output end of the first energy storage circuit, and the other end of the eighth switch is respectively connected to the second output end of the AC / DC conversion circuit and one end of the fifth switch; one end of the ninth switch is connected to the second output end of the second energy storage circuit, and the other end of the ninth switch is connected to the other end of the fifth switch and one end of the sixth switch.

[0019] Through the above technical means, based on the conduction or disconnection of each switch in the second switch circuit and the third switch circuit, the storage-charge integrated device can realize different charging or discharging functions. In this way, the charging state and discharging state of the energy storage circuit can be controlled according to demand, thereby improving the energy utilization and management efficiency of the storage-charge integrated device.

[0020] In some embodiments, the fourth switch, the fifth switch and the sixth switch are all in the on state and the seventh switch, the eighth switch and the ninth switch are all in the off state; the charging circuit is also configured to output charging to the device to be charged based on the second charging power provided by the AC-DC conversion circuit, or to feed back electrical energy to the external power based on the third charging power provided by the device to be charged.

[0021] Through the above technical means, by turning on or off each switch in the second switch circuit and the third switch circuit, the AC-DC conversion circuit can charge the device to be charged alone, or the device to be charged can feed back electrical energy to the external power. In this way, the charging mode or discharge mode of the device to be charged can be switched according to different application scenarios, thereby improving the energy utilization efficiency and the intelligence level of the integrated storage and charging device. In addition, the switch can be disconnected when charging is not needed to reduce energy waste.

[0022] In some embodiments, the fifth switch, the seventh switch and the ninth switch are all in the on state and the fourth switch, the sixth switch and the eighth switch are all in the off state; the AC-DC conversion circuit is also configured to charge at least two energy storage circuits based on external power, or to feed back electrical energy to the external power based on a first charging power provided by at least two energy storage circuits.

[0023] Through the above technical means, by turning on or off each switch in the second switch circuit and the third switch circuit, the energy storage circuit can feedback electric energy to the external power, or the external power can charge the energy storage circuit. In this way, the charging mode or discharging mode of the energy storage circuit can be switched according to different application scenarios, thereby improving the energy utilization efficiency and the intelligence level of the storage and charging integrated device. In addition, the switch can be disconnected when charging is not required to reduce energy waste.

[0024] In some embodiments, when the third switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are all in the on state and the first switch, the second switch, the fifth switch and the seventh switch are all in the off state, the charging circuit is configured to jointly output charging to the device to be charged based on the first charging power provided by at least two energy storage circuits connected in series and the second charging power provided by the AC-DC conversion circuit; or, when the first switch, the second switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are all in the on state and the third switch, the fifth switch and the seventh switch are all in the off state, the charging circuit is configured to jointly output charging to the device to be charged based on the first charging power provided by at least two energy storage circuits connected in parallel and the second charging power provided by the AC-DC conversion circuit.

[0025] Through the above technical means, based on the conduction or disconnection of each switch in the first switch circuit, the second switch circuit and the third switch circuit, the first charging power provided by at least two energy storage circuits connected in series and the second charging power provided by the AC-DC conversion circuit are jointly output to the device to be charged, or the first charging power provided by at least two energy storage circuits connected in parallel and the second charging power provided by the AC-DC conversion circuit are jointly output to the device to be charged. In this way, the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, the output voltage range of the storage-charging integrated device is expanded, and the storage-charging integrated device can achieve voltage adaptation with a variety of devices to be charged.

[0026] In some embodiments, the integrated storage and charging device also includes a control circuit; wherein: the control circuit is connected to the first switch circuit, the second switch circuit and the third switch circuit, and the control circuit is configured to send a drive signal to the first switch circuit, the second switch circuit and the third switch circuit; wherein the drive signal is used to control the conduction and disconnection of the switches in the first switch circuit, the second switch circuit and the third switch circuit.

[0027] Through the above technical means, the control circuit controls the on or off of each switch to enable the storage-charging device to achieve different functions, thereby improving the convenience and safety of the control of the storage-charging device.

[0028] In some embodiments, each energy storage circuit includes at least one energy storage unit; wherein: at least one energy storage unit is connected in series and / or in parallel between a first output terminal of the energy storage circuit and a second output terminal of the energy storage circuit so that the energy storage circuit can provide charging power to the charging circuit.

[0029] Through the above-mentioned technical means, each energy storage circuit includes a plurality of energy storage units connected in series and / or in parallel. Thus, due to the modularity of the energy storage units, the energy storage units can be freely increased or decreased, which facilitates the rapid connection and removal of the energy storage units and improves the charging flexibility of the integrated storage and charging device.

[0030] In some embodiments, the AC-DC conversion circuit is disposed in the storage-charging device.

[0031] Through the above technical means, the AC-DC conversion circuit is arranged in the storage-charging integrated device, which reduces the requirements for the charging interface between the AC power grid and can make charging more convenient.

[0032] In a second aspect, an embodiment of the utility model provides a charging pile, which includes a storage-charging integrated device as described in any one of the first aspects.

[0033] In a third aspect, an embodiment of the utility model provides a charging system, which includes a device to be charged and a charging pile as described in the second aspect.

[0034] 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 invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 1 ;

[0036] Figure 2 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 2 ;

[0037] Figure 3 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 3 ;

[0038] Figure 4 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 4 ;

[0039] Figure 5 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 5 ;

[0040] Figure 6 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 6 ;

[0041] Figure 7 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 7 ;

[0042] Figure 8 A schematic diagram of the structure of a charging pile provided in an embodiment of the utility model;

[0043] Fig. 9 A schematic diagram of the structure of a charging system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0044] In order to more thoroughly understand the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of the present invention. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0046] In the following description, referring to the following description, referring to a subset of all possible embodiments, but it can be understood that the "possible embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0047] It should also be pointed out that the terms "first\second\third" involved in the embodiments of the present invention 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 invention described here can be implemented in an order other than that illustrated or described here.

[0048] In addition, except as mentioned herein, the specific features, structures or characteristics described in conjunction with the embodiments mentioned herein may be included in at least one embodiment of the present utility model. The appearance of the phrase in various places 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 can be combined with other embodiments.

[0049] The following is an introduction to the related technologies of the present utility model.

[0050] 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 energy storage fields.

[0051] 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.

[0052] In the embodiment of the utility model, the battery may be a battery cell, or may be a battery pack (Pack) composed of multiple battery cells. A battery cell refers to a basic unit that can realize the mutual conversion of 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 embodiment of the utility model does not limit this.

[0053] In the embodiment of the utility model, the battery can 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 mixed connection through a busbar component.

[0054] In order to adjust the power load and increase long-term benefits, the integrated storage and charging device is used more and more frequently in charging stations, parking lots and other places. Among them, the integrated storage and charging device, "charging" means charging new energy vehicles. Therefore, the integrated storage and charging device can supply power to the grid or vehicles from the battery module when the power grid is at its peak; when the power grid is at its low point, the grid charges the battery module and the vehicle, thus playing the role of peak shaving and valley filling.

[0055] At present, new energy vehicles include multiple charging modes such as slow charging, fast charging, and super charging. Among them, the charging power of slow charging is usually between 3~7kW, and it takes 8~10 hours to fully charge the battery in a new energy vehicle; while the charging power of fast charging and super charging is generally higher, reaching tens to hundreds of kW, which can provide a large amount of electricity for new energy vehicles in a shorter time.

[0056] Considering the vehicle model requirements of high-voltage platforms, electric vehicles have increasingly higher requirements for the output voltage range of charging piles. However, the output voltage of charging piles in related technologies is usually between 200V and 500V, which cannot meet the vehicle model requirements of high-voltage platforms and reduces the utilization rate of charging piles.

[0057] In a possible implementation, the storage-charging device includes an isolated bidirectional alternating current / direct current (AC / DC) converter, an energy storage system (or an energy storage circuit), and a power module, where the power module can be a direct current / direct current (DC / DC) converter, or a DC conversion circuit. The input end of the isolated bidirectional AC / DC converter is connected to the AC power grid, the output end of the isolated bidirectional AC / DC converter is connected to the output end of the energy storage system, and the input end of the power module is connected between the input end of the isolated bidirectional AC / DC converter and the output end of the energy storage system, the output end of the power module is connected to the input end of the charging gun, and the output end of the charging gun is connected to the device to be charged, that is, the isolated bidirectional AC / DC converter and the energy storage system are connected in parallel, and the charging power provided by each is provided to the power module, so that the charging power is converted by the power module and provided to the charging gun, so that the charging gun charges the device to be charged, but the existence of the power module will not only increase more costs, but also the DC conversion function of the DC conversion circuit is redundant with the energy storage system, which reduces the economic efficiency.

[0058] In another possible implementation, the storage-charging integrated device includes an isolated bidirectional AC / DC converter and an energy storage system, and the power module is omitted. Among them, the input end of the isolated bidirectional AC / DC converter is connected to the AC power grid, the first output end of the isolated bidirectional AC / DC converter is connected to the first output end of the charging gun, the second output end of the isolated bidirectional AC / DC converter is connected to the first output end of the energy storage system, the second output end of the energy storage system is connected to the second input end of the charging gun, and the output end of the charging gun is connected to the device to be charged, that is, the isolated bidirectional AC / DC converter and the energy storage system are connected in series, and the charging power is provided to the charging gun in a series manner so that the charging gun charges the device to be charged. However, there is a problem of voltage solidification through the series connection method. For example, a large amount of energy storage batteries need to be configured to realize supercharging of the 800 volt (V) voltage platform, which will not be compatible with the fast charging of the 400V voltage platform. In other words, the series connection method cannot be adapted to more devices to be charged, resulting in the problem of reducing the utilization rate of the charging pile.

[0059] Based on this, an embodiment of the utility model provides an integrated storage and charging device, which includes at least two energy storage circuits, at least one first switching circuit and a charging circuit; the charging circuit outputs charging to the device to be charged based on the first charging power provided by the at least two energy storage circuits and / or the second charging power provided by the AC / DC conversion circuit, so that the output voltage range of the integrated storage and charging device can be expanded, and because at least two energy storage circuits can output a higher first charging power, the integrated storage and charging device can output a high-power charging that meets the charging demand based on the lower power provided by the external power, thereby improving the charging efficiency of the charging pile; in addition, no DC conversion circuit is required in the integrated storage and charging device, which reduces the cost of the integrated storage and charging device; and at least two energy storage circuits are controlled by at least one first switching circuit to be connected in series or in parallel, so that the output voltage of the at least two energy storage circuits can also be changed, further expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile, and further improving the utilization rate of the charging pile.

[0060] The present invention is further described in detail below through the accompanying drawings and specific embodiments.

[0061] In one embodiment of the present invention, Figure 1 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 1 .like Figure 1 As shown, the integrated storage and charging device may include at least two energy storage systems, at least one first switch circuit 102 and a charging circuit 103; wherein:

[0062] At least one first switch circuit 102 is connected between at least two energy storage circuits, and the at least one first switch circuit 102 is configured to connect the at least two energy storage circuits in series and / or in parallel in response to a received driving signal, and the at least two energy storage circuits can provide a first charging power to the charging circuit 103;

[0063] The charging circuit 103 is connected to the AC / DC conversion circuit 104 and at least two energy storage circuits respectively. The AC / DC conversion circuit 104 is configured to convert the received external power into a second charging power provided to the charging circuit 103. The charging circuit 103 is configured to perform charging output to the device to be charged 201 based on the first charging power provided by the at least two energy storage circuits and / or the second charging power provided by the AC / DC conversion circuit 104.

[0064] In the embodiment of the utility model, at least two energy storage circuits may include a first energy storage circuit 1011, a second energy storage circuit 1012, ..., an Nth energy storage circuit 101N; here, the specific value of N can be determined according to actual conditions, and no limitation is made here. In addition, at least one first switch circuit may include a first-first switch circuit, a first-second switch circuit, ..., a first-M switch circuit, and the value of M can be determined according to actual conditions, and no limitation is made here. It should be noted that the first-M switch circuit is Figure 1 Both can be displayed by the first switch circuit 102, and no distinction is made here.

[0065] In the embodiment of the utility model, the input end of the AC / DC conversion circuit 104 is connected to the AC power grid 202, the first output end P7 of the AC / DC conversion circuit 104 is connected to the first input end P5 of the charging circuit 103, and the second output end P8 of the AC / DC conversion circuit 104 is connected to the first energy storage circuit 1011; the first output end P9 of the Nth energy storage circuit 101N is connected to the first switch circuit 102, and the second output end P10 of the Nth energy storage circuit 101N is respectively connected to the first switch circuit 102 and the second input end P6 of the charging circuit 103; the output end of the charging circuit 103 is connected to the device to be charged 201.

[0066] In an embodiment of the utility model, the first energy storage circuit 1011, the second energy storage circuit 1012, ..., and the Nth energy storage circuit 101N are connected through at least one first switch circuit 102, and the driving signal received by at least one first switch circuit 102 is used to connect the first energy storage circuit 1011, the second energy storage circuit 1012, ..., and the Nth energy storage circuit 101N in series, in parallel, or in series and parallel. Exemplarily, N is equal to 3. In this case, at least one first switch circuit 102 may include two, which are correspondingly connected between the first energy storage circuit 1011 and the second energy storage circuit 1012, and between the second energy storage circuit 1012 and the third energy storage circuit 1013. The two first switch circuits are connected in series with the third energy storage circuit 1013 after being connected in parallel with the second energy storage circuit 1012 according to the received driving signal, that is, the first energy storage circuit 1011, the second energy storage circuit 1012 and the third energy storage circuit 1013 are connected in series and parallel, or the first energy storage circuit 1011, the second energy storage circuit 1012 and the third energy storage circuit 1013 are connected in parallel, etc.

[0067] It should be noted that, in the embodiment of the utility model, the first output terminal P1 of the first energy storage circuit 1011, the second output terminal P2 of the first energy storage circuit 1011, the first output terminal P3 of the second energy storage circuit 1012, the second output terminal P4 of the second energy storage circuit 1012, ..., the first output terminal P9 of the Nth energy storage circuit 101N, the second output terminal P10 of the Nth energy storage circuit 101N, the first input terminal P5 of the charging circuit 103, the second input terminal P6 of the charging circuit 103, the first output terminal P7 of the AC-DC conversion circuit 104 and the second output terminal P8 of the AC-DC conversion circuit can be respectively determined as the positive terminal or the negative terminal according to the specific structure, so as to realize the first charging power provided by at least two energy storage circuits and / or the second charging power provided by the AC-DC conversion circuit 104 to charge and output to the device to be charged.

[0068] In an embodiment of the utility model, the AC-DC conversion circuit 104 can be an isolated unidirectional ACDC module or an isolated bidirectional ACDC module, in which an isolation chip is arranged inside to isolate the storage and charging device 10 from the grid side. The specific structure of the AC-DC conversion circuit 104 is not limited here.

[0069] In the embodiment of the utility model, the external power can be a power supply device or an AC power grid, which is not specifically limited. Figure 1 The external power shown is an AC grid. It should be noted that if the external power is an AC grid, it is necessary to connect an AC-DC conversion circuit 104 between the AC grid and the storage-charging integrated device, and the AC grid 202 is connected to the AC-DC conversion circuit 104, and can output AC voltage and AC current to the AC-DC conversion circuit 104. The AC-DC conversion circuit 104 is configured to convert the AC voltage and AC current output by the AC grid 202 into DC power to provide a second charging power. In addition, the AC grid 202 can be a three-phase AC grid, and its input power is generally less than or equal to 150kW. Those skilled in the art can understand that the AC grid 202 generally refers to a system that can provide power. As an example, the AC grid 202 can be a power source for municipal power, and the input power of the AC grid 202 is 30 to 120kW.

[0070] It should also be noted that the AC / DC conversion circuit 104 can be arranged in the storage-charging integrated device 10, or can be arranged outside the storage-charging integrated circuit 10, and can be arranged according to actual needs. For the AC / DC conversion circuit 104 arranged inside the storage-charging integrated device 10, although this solution increases the volume of the storage-charging integrated device 10 to a certain extent, the requirements for the charging interface between the AC power grid 202 are reduced, so charging can be more convenient.

[0071] That is to say, the AC-DC conversion circuit 104 is disposed in the integrated storage-charging device, which reduces the requirements for the charging interface between the AC power grid 202 and enables charging to be more convenient.

[0072] In the embodiment of the utility model, each energy storage circuit can be a battery capable of storing electrical energy in the storage-charging device 10, such as a lithium iron phosphate battery, a lithium ion battery, etc. Each energy storage circuit can store electrical energy output or converted from an AC power grid or renewable energy, such as a photovoltaic power generation device. The battery capacity and type of the energy storage battery are not limited herein.

[0073] In a possible implementation, taking N equal to 2 as an example, at this time, there is only one first switch circuit; Figure 1 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 1 .like Figure 1 As shown, the integrated storage and charging device 10 may include a first energy storage circuit 1011, a second energy storage circuit 1012, a first switch circuit 102 and a charging circuit 103; wherein:

[0074] The input end of the AC / DC conversion circuit 104 is connected to the alternating current 202, the first output end P7 of the AC / DC conversion circuit 104 is connected to the first input end P5 of the charging circuit 103, and the second output end P8 of the AC / DC conversion circuit 104 is connected to the first energy storage circuit; the first output end P1 of the first energy storage circuit 1011 is also connected to the first end of the first switch circuit 102, and the second output end P2 of the first energy storage circuit 1011 is connected to the second end of the first switch circuit 102; the first output end P3 of the second energy storage circuit 1012 is connected to the third end of the first switch circuit 102, and the second output end P4 of the second energy storage circuit 1012 is respectively connected to the fourth end of the first switch circuit 102 and the second input end P6 of the charging circuit 103; the output end of the charging circuit 103 is connected to the device to be charged 201.

[0075] In an embodiment of the utility model, the first switching circuit 102 responds to the received driving signal to connect the first energy storage circuit 1011 and the second energy storage circuit 1012 in series or in parallel, and the charging circuit 103 performs charging output for the device to be charged based on the first charging power provided by the first energy storage circuit 1011 and the second energy storage circuit 1012.

[0076] In some embodiments, each energy storage circuit includes at least one energy storage unit; wherein: at least one energy storage unit is connected in series and / or in parallel between a first output end of the energy storage circuit and a second output end of the energy storage circuit so that the energy storage circuit can provide charging power to the charging circuit.

[0077] In the embodiment of the utility model, an energy storage circuit is used for exemplary description. Multiple energy storage units in the energy storage circuit can be connected in parallel, or can be connected in series, or can be connected in series and in parallel, that is, in series-parallel mode, which is not specifically limited here. In the utility model and the following embodiments, multiple energy storage units are connected in series as an example for description. In this way, when there are multiple energy storage units, the power of the energy storage circuit is the sum of the power of multiple energy storage units. In this way, the energy storage circuit 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 202 side to meet the high-power charging demand.

[0078] Thus, in the embodiment of the utility model, each energy storage circuit includes a plurality of energy storage units connected in series and / or in parallel. Thus, due to the modularity of the energy storage units, the energy storage units can be freely increased or decreased, which facilitates the rapid connection and removal of the energy storage units and improves the charging flexibility of the integrated storage and charging device.

[0079] In some embodiments, each energy storage unit includes an energy storage battery, and each energy storage unit is configured to provide charging power based on the electrical energy of the energy storage battery; wherein the charging power provided by each energy storage battery is less than or equal to the charging power provided by the corresponding energy storage circuit.

[0080] In the embodiment of the utility model, the energy storage battery can be a single-cell battery, a multi-cell battery, a blade battery, a battery module, etc., and there is no specific limitation here.

[0081] In an embodiment of the utility model, the number of energy storage batteries in each energy storage unit may be equal or unequal, and may be set according to specific needs. Each energy storage unit may provide charging power based on the number of energy storage batteries it contains. It should be understood that the charging power provided by different energy storage units may be the same or different. In this way, each energy storage unit includes at least one energy storage battery, so that the output power of the storage-charging device can be controlled to meet different charging needs.

[0082] In a possible implementation, at least two energy storage circuits include a first energy storage circuit and a second energy storage circuit, the voltage ranges of the first energy storage circuit and the second energy storage circuit are equal, and the first energy storage circuit and the second energy storage circuit need to be connected to the charging circuit at the same time, so that the power of the first energy storage circuit and the second energy storage circuit are equal, to avoid the first energy storage circuit from continuously supplying power. If the second energy storage circuit is needed to supply power together, the charging efficiency is reduced due to insufficient power of the first energy storage circuit, and charging failure may occur in severe cases. Here, if a certain energy storage circuit fails, then another energy storage circuit is allowed to be connected to the charging circuit alone.

[0083] In the embodiment of the utility model, assuming that the highest voltage platform required for charging is 800V, the first energy storage circuit or the second energy storage circuit each outputs 400V, or the first energy storage circuit and the second energy storage circuit can output 800V when connected in series. Exemplarily, the voltage range of the first energy storage circuit and the second energy storage circuit can both be [250V, 400V], or can also be [260V, 374V]. It should be noted that the voltage range is determined according to the highest voltage platform required for charging, and it should be understood that the voltage range can be set according to actual conditions.

[0084] Here, the voltage range of the first energy storage circuit 1011 is used as an example. For the voltage range of the first energy storage circuit 1011, the first energy storage circuit 1011 includes an energy storage battery, and the output voltage of the energy storage battery itself has a range. For example, the energy storage battery outputs 3.5V when it is fully charged, and outputs 2.5V when the energy storage battery is empty. Then, the upper limit of the voltage range can be designed by determining the number of energy storage batteries according to the output voltage of the energy storage battery when it is fully charged, and the lower limit is determined by the output voltage range of the energy storage battery when it is empty. It should also be noted that if the AC-DC conversion circuit 104 is required to be connected to the charging circuit together with the energy storage circuit, if the highest voltage platform required for charging is 800V, there are two energy storage circuits in the storage-charging integrated device 10, and the voltage ranges of the two energy storage circuits are equal, then the upper limit of the voltage range of the energy storage circuit cannot be higher than 400V. If it is higher than 400V, the AC-DC conversion circuit may not be started.

[0085] It can be understood that different energy storage batteries have different voltage ranges, and different AC-DC conversion circuits have different output capabilities. The voltage range of the energy storage circuit needs to be determined based on the maximum voltage required for charging, the energy storage battery, and the AC-DC conversion circuit.

[0086] It should be noted that in the embodiment of the utility model, the first energy storage circuit and the second energy storage circuit can be obtained by splitting the energy storage circuit in the storage-charging integrated device in the related art (the voltage range of the energy storage circuit is about 520~700V) into two identical parts, and the output voltage of the energy storage circuit in the related art needs to be given to the DC conversion circuit, and the voltage is switched through the DC conversion circuit. Here, the utility model divides the energy storage circuit in the related art into two energy storage circuits (that is, the first energy storage circuit and the second energy storage circuit in the utility model), and cancels the DC conversion circuit in the related art, and switches the voltage of the two energy storage circuits in series and parallel, such as switching between 800V and 400V, to meet the charging needs of the device to be charged, which can not only improve the economy, but also expand the output range of the storage-charging device, and improve the utilization rate of the charging pile.

[0087] An embodiment of the utility model provides an integrated storage and charging device, in which the charging circuit outputs charging to a device to be charged based on a first charging power provided by at least two energy storage circuits and / or a second charging power provided by an AC / DC conversion circuit, thereby expanding the output voltage range of the integrated storage and charging device, and because at least two energy storage circuits can output a higher first charging power, the integrated storage and charging device can output a high-power charging circuit that meets the charging demand based on a lower power provided by external power, thereby improving the charging efficiency of the charging pile; in addition, no DC conversion circuit is required in the integrated storage and charging device, thereby reducing the cost of the integrated storage and charging device; and at least two energy storage circuits are controlled to be connected in series or in parallel through at least one first switching circuit, thereby also being able to change the output voltage of the first energy storage circuit and the second energy storage circuit, further expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged, thereby being able to improve the charging flexibility of the charging pile, thereby improving the utilization rate of the charging pile.

[0088] In another embodiment of the present invention, based on Figure 2 In the storage-charging integrated device 10 shown, at least two energy storage circuits include a first energy storage circuit 1011 and a second energy storage circuit 1012, and the first switch circuit 102 includes a first switch K1, a second switch K2 and a third switch K3; wherein:

[0089] The first output terminal P1 of the first energy storage circuit 1011 and the first output terminal P3 of the second energy storage circuit 1012 are connected through the first switch K1; the second output terminal P1 of the first energy storage circuit 1011 and the second output terminal P4 of the second energy storage circuit 1012 are connected through the second switch K2; the second output terminal P3 of the first energy storage circuit 1011 and the first output terminal of the second energy storage circuit are connected through the third switch K3.

[0090] In the embodiment of the utility model, for the first switch circuit 102, the first switch circuit 102 may include a first switch K1, a second switch K2 and a third switch K3. The first switch circuit 102 may also include other types of switches, which can connect the first energy storage circuit 1011 and the second energy storage circuit 1012 in series or in parallel.

[0091] That is to say, in the embodiment of the utility model, by controlling the conduction or disconnection of the first switch, the second switch and the third switch, the first energy storage circuit and the second energy storage circuit can be controlled to be connected in series or in parallel, the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, and the output voltage range of the storage-charging device is expanded, so that the storage-charging device can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile and further improving the utilization rate of the charging pile; in addition, no DC conversion circuit is required in the storage-charging device, thereby reducing the cost of the storage-charging device.

[0092] In one possible implementation, Figure 3 A schematic diagram of the composition structure of a storage and charging integrated device provided in an embodiment of the utility model Figure 3 .like Figure 3 As shown, the positive output end of the first energy storage circuit 101 is respectively connected to the negative output end of the AC / DC conversion circuit 104 and one end of the first switch K1, and the negative output end of the first energy storage circuit 101 is respectively connected to one end of the second switch K2 and one end of the third switch K3; the other end of the third switch K3 is respectively connected to the other end of the first switch K1 and the positive output end of the second energy storage circuit 1012; the negative output end of the second energy storage circuit 1012 is respectively connected to the other end of the second switch K2 and the negative input end of the charging circuit 103; the positive output end of the AC / DC conversion circuit 104 is connected to the positive input end of the charging circuit 103.

[0093] That is to say, in the embodiment of the present utility model, the first output terminal of the AC / DC conversion circuit 104 can be a positive terminal, and the second output terminal of the AC / DC conversion circuit 104 can be a negative terminal; the first output terminal of the first energy storage circuit 1011 can be a positive terminal, and the second output terminal of the first energy storage circuit 1011 can be a negative terminal; the first output terminal of the second energy storage circuit 1012 can be a positive terminal, and the second output terminal of the second energy storage circuit 1012 can be a negative terminal; the first terminal of the charging circuit 103 can be a positive terminal, and the second terminal of the charging circuit 103 can be a negative terminal. It should be understood that whether each terminal in each circuit is a positive terminal or a negative terminal is determined specifically according to the device situation.

[0094] It should be noted that in the present utility model and the following embodiments, based on Figure 3 The illustrated embodiment is described.

[0095] In some embodiments, Figure 4 As shown, the first switch K1 and the second switch K2 are both in an off state and the third switch K3 is in an on state, so that the first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in series.

[0096] In the embodiment of the utility model, the first switch K1 and the second switch K2 are both in the off state and the third switch K3 is in the on state, the first energy storage circuit 1011, the second energy storage circuit 1012 and the AC-DC conversion circuit 104 are connected in series, at this time, the first charging power provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 is the sum of the charging power provided by the first energy storage circuit 1011 and the charging power provided by the second energy storage circuit 1012, that is, the first charging power provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in series and the second charging power provided by the AC-DC conversion circuit 104 are used to meet high-power charging requirements, such as charging requirements of 300kW and above. In addition, since the first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in series, the voltage jointly provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 is the sum of the voltage provided by the first energy storage circuit and the voltage provided by the second energy storage circuit, that is, the voltage provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in series and the voltage provided by the AC-DC conversion circuit 104 can meet the high voltage charging requirements, such as the 800V voltage charging requirements.

[0097] In some embodiments, Figure 5 As shown, the first switch K1 and the second switch K2 are both in the on state and the third switch K3 is in the off state, so that the first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in parallel.

[0098] In the embodiment of the utility model, the first switch K1 and the second switch K2 are both in the on state and the third switch K3 is in the off state. The first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in parallel and then connected in series with the AC-DC conversion circuit 104. At this time, the first charging power provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in parallel and the second charging power provided by the AC-DC conversion circuit 104 can meet the charging demand of medium power, such as the charging demand of 120-300kW power. In addition, since the first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in parallel, the voltage provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in parallel is the voltage provided by the first energy storage circuit 1011 or the voltage provided by the second energy storage circuit 1012, then the voltage provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in parallel and the voltage provided by the AC-DC conversion circuit 104 can meet the charging demand of medium voltage, such as the charging demand of 400V voltage. It should be noted that if all switches in the first switch circuit 102 are in the off state, the AC-DC conversion circuit 104 can be used to charge the device to be charged alone, which can meet low-power charging requirements, such as 30-120kW charging requirements.

[0099] In the embodiment of the present utility model, taking voltage as an example, the voltage provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in series is greater than or equal to the voltage provided by the first energy storage circuit 1011 and the second energy storage circuit 1012 in parallel.

[0100] It can be understood that in the embodiment of the utility model, by controlling the on or off of the first switch, the second switch and the third switch, the first energy storage circuit and the second energy storage circuit can be controlled to be connected in series or in parallel, and the output voltage of the first energy storage circuit and the second energy storage circuit can be changed, thereby expanding the output voltage range of the integrated storage and charging device, so that the integrated storage and charging device can achieve voltage adaptation with a variety of devices to be charged.

[0101] In some embodiments, Figure 6 As shown, the integrated storage and charging device 10 further includes a second switch circuit 105, and the second switch circuit 105 further includes a fourth switch K4, a fifth switch K5 and a sixth switch K6; wherein:

[0102] One end of the fourth switch K4 is connected to the first output of the AC / DC conversion circuit 104, and the other end of the fourth switch K4 is connected to the first input of the charging circuit 103; one end of the fifth switch K5 is respectively connected to the first output of the first energy storage circuit 1011 and the second output of the AC / DC conversion circuit 104, and the other end of the fifth switch K5 is respectively connected to the second output of the second energy storage circuit 1012 and one end of the sixth switch K6; the other end of the sixth switch K6 is connected to the second input of the charging circuit 103.

[0103] In the embodiment of the utility model, by controlling the on or off of the fourth switch K4, the fifth switch K5 and the sixth switch K6, it is controlled whether at least two energy storage circuits and / or the AC-DC conversion circuit 104 charge the device to be charged 201. In this way, the on and off of the charging circuit can be controlled according to the situation, thereby reducing the power consumption of the storage-charging device 10.

[0104] In some embodiments, the fourth switch K4 and the sixth switch K5 are both in the on state and the fifth switch K5 is in the off state, and the charging circuit 103 is also configured to jointly output charging to the device to be charged 201 based on the first charging power provided by at least two energy storage circuits and the second charging power provided by the AC-DC conversion circuit 104.

[0105] In the embodiment of the utility model, when the fourth switch and the second switch are both in the on state and the fifth switch is in the off state, if the first switch K1 and the second switch K2 are both in the off state and the third switch K3 is in the on state, then the first energy storage circuit 1011, the second energy storage circuit 1012 and the AC-DC conversion circuit 104 are connected in series to output charging to the device to be charged. At this time, since the first energy storage circuit 1011, the second energy storage circuit 1012 and the AC-DC conversion circuit 104 are connected in series, high voltage charging requirements, such as 800V voltage charging requirements, can be met; if the first switch K1 and the second switch K2 are both in the on state and the third switch K3 is in the off state, then the first energy storage circuit 1011 and the second energy storage circuit 1012 are connected in parallel and then connected in series with the AC-DC conversion circuit 104, that is, connected in series and parallel, and medium voltage charging requirements, such as 400V voltage charging requirements, can be met.

[0106] In the embodiment of the utility model, by making the fourth switch K4 and the sixth switch K6 both in the on state and the fifth switch K5 in the off state, at least two energy storage circuits and the AC-DC conversion circuit 104 can be controlled to jointly charge the device to be charged 201, and based on the on or off of each switch in the first switch circuit 102, the output voltage of the first energy storage circuit 1011 and the second energy storage circuit 1012 can be changed, thereby expanding the output voltage range of the storage-charging integrated device 10, so that the storage-charging integrated device 10 can achieve voltage adaptation with a variety of devices to be charged, thereby improving the charging flexibility of the charging pile, and further improving the utilization rate of the charging pile; in addition, no DC conversion circuit is required in the storage-charging integrated device, thereby reducing the cost of the storage-charging integrated device.

[0107] In some embodiments, Figure 7 As shown, the integrated storage and charging device 10 further includes a third switch circuit 106, and the third switch circuit 106 includes a seventh switch K7, an eighth switch K8 and a ninth switch K9; wherein:

[0108] One end of the seventh switch K7 is connected to the first output end of the first energy storage circuit 1011, and the other end of the seventh switch K7 is respectively connected to the first output end of the AC-DC conversion circuit 104 and one end of the fourth switch K4; one end of the eighth switch K8 is connected to the first output end of the first energy storage circuit 1011, and the other end of the eighth switch K8 is respectively connected to the second output end of the AC-DC conversion circuit 104 and one end of the fifth switch K5; one end of the ninth switch K9 is connected to the second output end of the second energy storage circuit 1012, and the other end of the ninth switch K9 is connected to the other end of the fifth switch K5 and one end of the sixth switch K6.

[0109] In the embodiment of the utility model, the storage-charge integrated device 10 realizes different charging or discharging functions based on the conduction or disconnection of each switch in the second switch circuit 105 and the third switch circuit 106. In this way, the charging state and discharging state of the energy storage circuit can be controlled according to demand, thereby improving the energy utilization and management efficiency of the storage-charge integrated device.

[0110] In some embodiments, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all in the on state and the seventh switch K7, the eighth switch K8 and the ninth switch K9 are all in the off state; the charging circuit 103 is also configured to output charging to the device to be charged 201 based on the second charging power provided by the AC-DC conversion circuit 104, or to feed back electrical energy to the external power based on the third charging power provided by the device to be charged 201.

[0111] In the embodiment of the utility model, when the charging demand of the device to be charged 201 is low power (for example, 30-120 kW), only the fourth switch K4, the fifth switch K5 and the sixth switch K6 are closed, so that the AC-DC conversion circuit 104 can charge and output the device to be charged 201 alone. In addition, when at least two energy storage circuits are out of power, the AC-DC conversion circuit 104 can also charge and output the device to be charged 201 alone.

[0112] It should be noted that if the device to be charged 201 has a vehicle-to-grid (V2G) function, then only the fourth switch, the fifth switch and the sixth switch may be closed to control the device to be charged 201 to feed back electrical energy to the external power to realize the V2G function, thereby playing the role of peak shaving and valley filling for the external power.

[0113] That is to say, by turning on or off each switch in the second switch circuit 105 and the third switch circuit 106, the AC-DC conversion circuit 104 can charge the device to be charged 201 alone, or the device to be charged 201 can feed back electric energy to the external power. In this way, the charging mode or the discharging mode of the device to be charged 201 can be switched according to different application scenarios, thereby improving the energy utilization efficiency and the intelligence of the storage and charging device. In addition, the switch can be turned off when charging is not needed to reduce energy waste.

[0114] In some embodiments, the fifth switch K5, the seventh switch K7 and the ninth switch K9 are all in the on state and the fourth switch K4, the sixth switch K6 and the eighth switch K8 are all in the off state; the AC-DC conversion circuit 104 is also configured to charge at least two energy storage circuits based on external power, or to feed back electrical energy to the external power based on the first charging power provided by the at least two energy storage circuits.

[0115] In an embodiment of the utility model, when at least two energy storage systems are used to feed back electric energy from external power, it is necessary to determine whether at least two energy storage circuits are connected in series to feed back electric energy from external power, or connected in parallel to feed back electric energy from external power, based on the voltage range of the external power. Exemplarily, the external power is an AC power grid. If the voltage of the AC power grid is 300V, then at least two energy storage circuits each output a voltage of 300V. If at least two energy storage circuits are connected in series to feed back electric energy from the AC power grid, the efficiency of the feedback electric energy is reduced due to the large difference between the series voltage and the voltage of the AC power grid 202. If at least two energy storage systems are used to feed back electric energy from the power grid in parallel, the voltage after the parallel connection is close to the voltage of the AC power grid, which improves the efficiency of the feedback electric energy. It should be noted that when the external power feeds back electric energy, at least two energy storage systems need to be connected to the charging circuit at the same time to ensure that the electric power of the two is the same.

[0116] In the embodiment of the utility model, the energy storage circuit can feedback electric energy to the external power, or the external power can charge the energy storage circuit by turning on or off each switch in the second switch circuit 105 and the third switch circuit 106. In this way, the charging mode or the discharging mode of the energy storage circuit can be switched according to different application scenarios, thereby improving the energy utilization efficiency and the intelligence of the storage and charging device. In addition, the switch can be turned off when charging is not required to reduce energy waste.

[0117] In some embodiments, the fourth switch K4, the sixth switch K5, the eighth switch K8 and the ninth switch K9 are all in the on state and the fifth switch K5 and the seventh switch K7 are all in the off state, and the charging circuit 103 is also configured to jointly charge the device to be charged 104 based on the first charging power provided by at least two energy storage circuits and the second charging power provided by the AC-DC conversion circuit 104.

[0118] It should be noted that whether at least two energy storage circuits (such as the first energy storage circuit and the second energy storage circuit) are connected in series or in parallel to the charging circuit is determined according to the charging demand. For example, if the charging demand is a high voltage (such as 800V), then based on the first switch circuit, the first energy storage circuit and the second energy storage circuit are connected in series and then connected in series with the AC-DC conversion circuit to output a high voltage; for another example, if the charging demand is a medium voltage (such as 400V), then based on the first switch circuit, the first energy storage circuit and the second energy storage circuit are connected in parallel and then connected in series with the AC-DC conversion circuit to output a medium voltage; for another example, if the charging demand is a low voltage (such as less than 400V), then based on the first switch circuit, the first energy storage circuit and the second energy storage circuit are not connected to the charging circuit, and the AC-DC conversion circuit supplies power to the device to be charged.

[0119] In a specific embodiment, when the third switch K3, the fourth switch K4, the sixth switch K5, the eighth switch K8 and the ninth switch K9 are all in the on state and the first switch K1, the second switch K2, the fifth switch K5 and the seventh switch K7 are all in the off state, the charging circuit 103 is configured to jointly output charging to the device to be charged 201 based on the first charging power provided by at least two energy storage circuits connected in series and the second charging power provided by the AC-DC conversion circuit 104; or, when the first switch K1, the second switch K2, the fourth switch K4, the sixth switch K6, the eighth switch K8 and the ninth switch K9 are all in the on state and the third switch K3, the fifth switch K5 and the seventh switch K7 are all in the off state, the charging circuit 103 is configured to jointly output charging to the device to be charged based on the first charging power provided by at least two energy storage circuits connected in parallel and the second charging power provided by the AC-DC conversion circuit 104.

[0120] It can be understood that the first charging power provided by at least two energy storage circuits connected in series and the second charging power provided by the AC-DC conversion circuit 104 are connected based on the conduction or disconnection of each switch in the first switch circuit 102, the second switch circuit 105 and the third switch circuit 106, so as to realize the charging output to the device to be charged 201 together, or the first charging power provided by at least two energy storage circuits connected in parallel and the second charging power provided by the AC-DC conversion circuit 104 are connected based on the charging output to the device to be charged 201 together. In this way, the output voltage of the first energy storage circuit 1011 and the second energy storage circuit 1012 can be changed, the output voltage range of the storage-charging integrated device is expanded, and the storage-charging integrated device can achieve voltage adaptation with a variety of devices to be charged.

[0121] In some embodiments, the storage-charging device 10 may further include a control circuit; wherein:

[0122] The control circuit is connected to the first switch circuit 102, the second switch circuit 105 and the third switch circuit 106, and the control circuit 106 is configured to send a drive signal to the first switch circuit 102, the second switch circuit 105 and the third switch circuit 106; wherein the drive signal is used to control the conduction and disconnection of the switches in the first switch circuit 102, the second switch circuit 105 and the third switch circuit 106.

[0123] In the embodiment of the utility model, the control circuit may also be referred to as the control unit of the storage-charging device 10 , which may include a microcontroller unit (MCU), a sensor, a switch circuit and other devices for monitoring, controlling and managing the storage-charging device 10 .

[0124] In the embodiment of the utility model, the control circuit can send a drive signal to each switch in the first switch circuit 102, the second switch circuit 105 and the third switch circuit 106. It should be understood that each drive signal can have a different level state, and the corresponding switch can be controlled to be turned on or off based on the level state of the drive signal. Exemplarily, when the drive signal is in a high level state, the corresponding switch can be controlled to be turned on, and when the drive signal is in a low level state, the corresponding switch can be controlled to be turned off.

[0125] Thus, in the embodiment of the utility model, the control circuit controls the on or off of each switch so that the storage-charging device can realize different functions, thereby improving the convenience and safety of the control of the storage-charging device.

[0126] In another embodiment of the present invention, Figure 8 The following is a schematic diagram of the structure of a charging pile provided by an embodiment of the utility model. Figure 8 As shown, the charging pile 80 includes the integrated storage and charging device 10 in the aforementioned embodiment.

[0127] In an embodiment of the utility model, the charging pile 80 may include the integrated storage and charging device 10 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.

[0128] In another embodiment of the present invention, Fig. 9 The following is a schematic diagram of the structure of a charging system provided by an embodiment of the utility model. Fig. 9 As shown, the charging system includes a device to be charged 201 and the charging pile 80 in the aforementioned embodiment.

[0129] As in the above-mentioned embodiment, the charging pile 80 includes a storage-charging integrated device, which charges the device to be charged 201. Here, the device to be charged is a new energy vehicle, such as an electric bicycle, an electric motorcycle, an electric car, etc.

[0130] In some embodiments, the charging circuit in the charging pile 80 may include a charging gun, and the output end of the charging gun is connected to the device to be charged 201.

[0131] It should be noted that in the embodiment of the utility model, the charging circuit and / or the charging gun can be arranged in the integrated storage and charging device, or can be arranged outside the integrated storage and charging device, and connected to the integrated storage and charging device when the device to be charged 201 needs to be charged, and no specific limitation is made here.

[0132] In another embodiment of the present invention, based on the above Figure 7The storage-charging integrated device shown in the figure may include a first energy storage circuit, a second energy storage circuit, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a charging circuit, an AC-DC conversion circuit, and a device to be charged in the charging system; here, the external power may be an AC power grid, and the voltage range of the first energy storage circuit and the second energy storage circuit may both be [260V, 374V]. The charging system provided by the embodiment of the utility model is specifically described below.

[0133] In the embodiment of the utility model, the charging system can also be called a super charging system, or a series-parallel switching storage-charging integrated system with a full range of voltage platforms, whose maximum output power is greater than or equal to 480kW, and can be applied to a variety of electric vehicle voltage platforms.

[0134] When the charging system is in 800V platform super charging mode, the third switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are closed, and the first switch, the second switch, the fifth switch and the seventh switch are opened. At this time, the first energy storage circuit, the second energy storage circuit and the AC-DC conversion circuit are connected in series to supply power for super charging for the device to be charged.

[0135] When the charging system is in 400V super charging mode, the first switch, the second switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are closed, and the third switch, the fifth switch and the seventh switch are opened. At this time, the first energy storage circuit and the second energy storage circuit are connected in parallel and in series with the AC-DC conversion circuit to perform high-power charging for the device to be charged.

[0136] When the charging system is in low-power charging mode, the fourth switch, the fifth switch and the sixth switch are closed, and the first switch, the second switch, the third switch, the seventh switch, the eighth switch and the ninth switch are opened. At this time, the AC-DC conversion circuit performs low-power charging for the device to be charged. Specifically, it is used when the power requested by the device to be charged is small or the energy storage circuit is out of power.

[0137] When the charging system is in energy storage and power replenishment mode, the first switch, the second switch, the fifth switch, the seventh switch and the ninth switch are closed, and the third switch, the fourth switch, the sixth switch and the eighth switch are opened, or the third switch, the fifth switch, the seventh switch and the ninth switch are closed, and the first switch, the second switch, the fourth switch, the sixth switch and the eighth switch are opened. At this time, when the energy storage battery is low in power and there is no device to be charged, the AC power grid replenishes power for the energy storage system.

[0138] When the charging system is in V2G mode: the fourth switch, the fifth switch and the sixth switch are closed, and the first switch, the second switch, the third switch, the seventh switch, the eighth switch and the ninth switch are opened. At this time, the device to be charged feeds back electrical energy to the AC power grid.

[0139] When the charging system is in electrochemical energy storage (EES) mode (i.e., the energy storage circuit is in AC grid feedback mode), the first switch, the second switch, the fifth switch, the seventh switch, and the ninth switch are closed, and the third switch, the fourth switch, the sixth switch, and the eighth switch are opened. At this time, the first energy storage circuit and the second energy storage circuit are connected in parallel to feed back energy to the AC grid.

[0140] It should be noted that when using the 800V platform super charging mode or the 400V platform super charging mode to charge a device to be charged, if the device to be charged is about to be fully charged and the charging power required by the device to be charged is relatively small, you can also switch to the low-power charging mode.

[0141] In the implementation of the utility model, the 800V platform super charging mode can charge the equipment with a power demand of more than 300kW; the 400V platform super charging mode can charge the equipment with a power demand of less than 300kW; the power demand range that the low-power charging mode can provide is determined by the AC-DC conversion circuit, for example, 30~120kW. This is only an exemplary description, and the specific power range provided for each mode is determined according to the actual situation.

[0142] The embodiment of the utility model provides a charging system, which adjusts the voltage platform by switching two energy storage circuits in series and parallel, expands the adaptable voltage platform of the storage-charging integrated system, and can adapt to more devices to be charged, thereby improving the utilization rate of the charging pile. In addition, by connecting two energy storage circuits in series and parallel, the DC conversion circuit in the related technology can be eliminated, thereby improving the economic efficiency of the storage-charging integrated device.

[0143] It should be noted that in the present utility model, the term "technical type" is used in the present invention to improve the economic efficiency. The energy storage circuit is switched in series and parallel to adjust the voltage platform, expand the adaptive voltage platform of the storage-charging integrated system, and then adapt to more devices to be charged, thereby improving the utilization rate of the charging pile. Moreover, by connecting two energy storage circuits in series and parallel, it is also possible to cancel multiple restrictions corresponding to the DC conversion control in the relevant technology. The elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, product or device including the element.

[0144] In the several embodiments provided by the present utility model, 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.

[0145] 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 utility model, 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.

[0146] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A storage and charging device, characterized in that: The integrated storage and charging device comprises at least two energy storage circuits, at least one first switch circuit and a charging circuit; wherein: The at least one first switch circuit is connected between the at least two energy storage circuits, and the at least one first switch circuit is configured to connect the at least two energy storage circuits in series and / or in parallel in response to the received drive signal, and the at least two energy storage circuits can provide a first charging power to the charging circuit; The charging circuit is respectively connected to the AC-DC conversion circuit and the at least two energy storage circuits, the AC-DC conversion circuit is configured to convert the received external power into a second charging power provided to the charging circuit, and the charging circuit is configured to perform charging output to the device to be charged based on the first charging power provided by the at least two energy storage circuits and / or the second charging power provided by the AC-DC conversion circuit.

2. The storage-charging integrated device according to claim 1, characterized in that: The at least two energy storage circuits include a first energy storage circuit and a second energy storage circuit, and the first switch circuit includes a first switch, a second switch and a third switch; wherein: The first output end of the first energy storage circuit and the first output end of the second energy storage circuit are connected through the first switch; the second output end of the first energy storage circuit and the second output end of the second energy storage circuit are connected through the second switch; the second output end of the first energy storage circuit and the first output end of the second energy storage circuit are connected through the third switch.

3. The storage-charging integrated device according to claim 2, characterized in that: The first switch and the second switch are both in an off state and the third switch is in an on state, so that the first energy storage circuit and the second energy storage circuit are connected in series; or, The first switch and the second switch are both in an on state and the third switch is in an off state, so that the first energy storage circuit and the second energy storage circuit are connected in parallel.

4. The storage-charging integrated device according to claim 2, characterized in that: The storage-charging integrated device further includes a second switch circuit, which includes a fourth switch, a fifth switch and a sixth switch; wherein: One end of the fourth switch is connected to the first output of the AC / DC conversion circuit, and the other end of the fourth switch is connected to the first input end of the charging circuit; one end of the fifth switch is respectively connected to the first output end of the first energy storage circuit and the second output end of the AC / DC conversion circuit, and the other end of the fifth switch is respectively connected to the second output end of the second energy storage circuit and one end of the sixth switch; the other end of the sixth switch is connected to the second input end of the charging circuit.

5. The storage-charging integrated device according to claim 4, characterized in that: The fourth switch and the sixth switch are both in an on state and the fifth switch is in an off state; The charging circuit is further configured to jointly output charging to the device to be charged based on the first charging power provided by the at least two energy storage circuits and the second charging power provided by the AC-DC conversion circuit.

6. The storage-charging integrated device according to claim 4, characterized in that: The storage-charging integrated device further includes a third switch circuit, and the third switch circuit includes a seventh switch, an eighth switch and a ninth switch; wherein: One end of the seventh switch is connected to the first output end of the first energy storage circuit, and the other end of the seventh switch is respectively connected to the first output end of the AC-DC conversion circuit and one end of the fourth switch; one end of the eighth switch is connected to the first output end of the first energy storage circuit, and the other end of the eighth switch is respectively connected to the second output end of the AC-DC conversion circuit and one end of the fifth switch; one end of the ninth switch is connected to the second output end of the second energy storage circuit, and the other end of the ninth switch is connected to the other end of the fifth switch and one end of the sixth switch.

7. The storage-charging integrated device according to claim 6, characterized in that: The fourth switch, the fifth switch and the sixth switch are all in an on state, and the seventh switch, the eighth switch and the ninth switch are all in an off state; The charging circuit is further configured to output charging to the device to be charged based on the second charging power provided by the AC / DC conversion circuit, or to feed back electrical energy to the external power based on the third charging power provided by the device to be charged.

8. The storage-charging integrated device according to claim 6, characterized in that: The fifth switch, the seventh switch and the ninth switch are all in an on state and the fourth switch, the sixth switch and the eighth switch are all in an off state; The AC-DC conversion circuit is further configured to charge the at least two energy storage circuits based on the external power, or to feed back electric energy to the external power based on a first charging power provided by the at least two energy storage circuits.

9. The storage-charging integrated device according to claim 6, characterized in that: When the third switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are all in the on state and the first switch, the second switch, the fifth switch and the seventh switch are all in the off state, the charging circuit is configured to charge the device to be charged based on the first charging power provided by the at least two energy storage circuits connected in series and the second charging power provided by the AC-DC conversion circuit; or When the first switch, the second switch, the fourth switch, the sixth switch, the eighth switch and the ninth switch are all in the on state and the third switch, the fifth switch and the seventh switch are all in the off state, the charging circuit is configured to jointly output charging to the device to be charged based on the first charging power provided by the at least two energy storage circuits connected in parallel and the second charging power provided by the AC-DC conversion circuit.

10. The storage-charging integrated device according to claim 6, characterized in that: The storage-charging integrated device also includes a control circuit; wherein: The control circuit is connected to the first switch circuit, the second switch circuit and the third switch circuit, and the control circuit is configured to send a drive signal to the first switch circuit, the second switch circuit and the third switch circuit; wherein the drive signal is used to control the conduction and disconnection of the switches in the first switch circuit, the second switch circuit and the third switch circuit.

11. The integrated storage and charging device according to any one of claims 1 to 10, characterized in that: Each of the energy storage circuits comprises at least one energy storage unit; wherein: The at least one energy storage unit is connected in series and / or in parallel between the first output end of the energy storage circuit and the second output end of the energy storage circuit, so that the energy storage circuit can provide charging power to the charging circuit.

12. The integrated storage and charging device according to any one of claims 1 to 10, characterized in that: The AC / DC conversion circuit is arranged in the integrated storage and charging device.

13. A charging pile, characterized in that: The charging pile comprises a storage-charging integrated device as claimed in any one of claims 1 to 12.

14. A charging system, characterized in that: The charging system comprises a device to be charged and a charging pile as claimed in claim 13.

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