Storage and charging all-in-one machine system and charging station

Abstract

The utility model relates to a storage and charging all-in-one machine system and a charging station, and belongs to the field of charging station configuration. The storage and charging all-in-one machine system comprises an energy storage battery, a direct current bus, a bidirectional AC / DC module and a plurality of bidirectional DC / DC modules, wherein the AC side of the bidirectional AC / DC module is a three-phase four-wire system, and the bidirectional AC / DC module can carry out AC / DC mutual conversion; a charging and discharging port of the energy storage battery is connected with the direct current side of the bidirectional AC / DC module through a direct current bus. The first direct current sides of the two-way DC / DC are connected in parallel and then are connected to a direct current bus; the alternating current side of the bidirectional AC / DC module is used for connecting a power grid; the second direct current side of the bidirectional DC / DC module is used for being connected with a V2G direct current charging pile. According to the utility model, the energy storage battery can be connected with the bidirectional AC / DC module without the bidirectional DC / DC module, so that the cost can be reduced and the installation space can be reduced.

Description

Technical Field

[0001] This utility model relates to an integrated energy storage and charging system and a charging station, belonging to the field of charging station configuration. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for charging infrastructure is growing daily. Existing charging stations primarily function to provide charging services for electric vehicles, but they have several limitations:

[0003] 1) Inability to achieve AC / DC conversion: Most existing charging piles can only provide either DC charging or AC charging, and cannot flexibly switch according to the needs of electric vehicles or the grid conditions, thus limiting charging efficiency;

[0004] 2) Inability to store energy: Due to the lack of energy storage systems, existing charging piles cannot store energy during off-peak hours and cannot effectively alleviate the power grid's supply pressure during peak hours, thus failing to achieve peak shaving and valley filling.

[0005] 3) Inability to dynamically expand capacity: When electricity demand surges, existing charging piles cannot dynamically expand capacity through external power sources or energy storage devices, which limits the power supply capacity of charging stations.

[0006] Chinese invention patent application CN117767378A discloses a residential photovoltaic-energy storage-charging-discharging integrated system with V2G functionality. This system includes dynamic capacity expansion, collaborative linkage, and high integration. The dynamic capacity expansion is achieved by adding a bidirectional DC / DC converter to the existing residential photovoltaic-energy storage integrated system. This invention integrates photovoltaics, energy storage, and charging / discharging into a single residential photovoltaic-energy storage-charging-discharging integrated system, significantly reducing installation space. Secondly, the system employs an intelligent control strategy, establishing data acquisition and communication between the photovoltaic, energy storage battery, and charging / discharging sub-units to monitor the data status of each sub-unit in real time and adjust accordingly to different emergencies, achieving collaborative linkage between the photovoltaic, energy storage battery, and charging / discharging components. Finally, it integrates bidirectional DC / DC charging / discharging functionality, utilizing electric vehicle battery storage as the system's emergency power source, thus realizing dynamic capacity expansion.

[0007] While this solution can solve the problems of existing charging piles being unable to store energy and dynamically expand their capacity when applied to charging stations, it also presents challenges due to the high cost and large installation space requirements. This is because the energy storage battery in this solution needs to be connected to a bidirectional DC / DC converter first, and then the DC / DC module needs to be connected to the DC side of the AC / DC conversion unit. Utility Model Content

[0008] The purpose of this utility model is to provide an integrated energy storage and charging system and charging station to solve the problems of high cost and large installation space in the existing integrated energy storage and charging system.

[0009] To achieve the above objectives, the solution of this utility model includes:

[0010] This utility model discloses an integrated energy storage and charging system, which includes an energy storage battery, a DC bus, a bidirectional AC / DC module with a three-phase four-wire AC side that can convert between AC and DC, and several bidirectional DC / DC modules that can convert between high and low voltage.

[0011] The charging and discharging ports of the energy storage battery are connected to the DC side of the bidirectional AC / DC module via the DC bus; the first DC side of the bidirectional DC / DC module is connected in parallel to the DC bus; the AC side of the bidirectional AC / DC module is used to connect to the power grid; and the second DC side of the bidirectional DC / DC module is used to connect to the V2G DC charging pile.

[0012] Furthermore, the AC side of the bidirectional AC / DC module is also used to connect to an AC charging station.

[0013] Furthermore, the second DC side of the bidirectional DC / DC module is also used to connect in parallel with the photovoltaic DC / DC module used to connect the photovoltaic panel.

[0014] Furthermore, the energy storage battery comprises several battery packs connected in series.

[0015] Furthermore, each battery pack has a corresponding battery management unit connected in parallel at both ends.

[0016] Furthermore, the charging and discharging port of the energy storage battery is equipped with a normally open contact of the first circuit breaker; the DC bus is connected to the normally open contact of the first circuit breaker.

[0017] Furthermore, a DC switch is provided on the DC side of the bidirectional AC / DC module; the DC bus is connected to the DC side of the bidirectional AC / DC module through the DC switch;

[0018] The AC side of the bidirectional AC / DC module is equipped with an AC switch; the AC side of the bidirectional AC / DC module is connected to the power grid through the AC switch.

[0019] The AC side of the bidirectional AC / DC module is also equipped with an AC surge protector.

[0020] Furthermore, a first DC fuse is installed on the connection line between the positive terminal of the DC bus and the positive terminal of the DC side of the bidirectional AC / DC module; a second DC fuse is installed on the connection line between the negative terminal of the DC bus and the negative terminal of the DC side of the bidirectional AC / DC module.

[0021] Furthermore, the connecting line used to connect the parallel bidirectional DC / DC converter to the DC bus is equipped with a DC fuse, a normally open contact of the second circuit breaker, and a starting rheostat.

[0022] This utility model provides a charging station, including the integrated storage and charging system described above.

[0023] The beneficial effects of this utility model are as follows: As a pioneering invention, this utility model provides an integrated energy storage and charging system and charging station, including an energy storage battery, a DC bus, a bidirectional AC / DC module with a three-phase four-wire AC side capable of AC / DC conversion, and several bidirectional DC / DC modules capable of high-low voltage conversion; the charging and discharging ports of the energy storage battery are connected to the DC side of the bidirectional AC / DC module through the DC bus; the first DC side of the bidirectional DC / DC module is connected in parallel to the DC bus; the AC side of the bidirectional AC / DC module is used to connect to the power grid; the second DC side of the bidirectional DC / DC module is used to connect to a V2G DC charging pile. The integrated energy storage and charging system and charging station provided by this utility model have several advantages. First, the bidirectional AC / DC module and each bidirectional DC / DC module can output DC current to the energy storage battery through the DC bus, allowing the energy storage battery to store energy. The energy storage battery can also supply power to each bidirectional DC / DC module and the bidirectional AC / DC module through the DC bus, achieving peak shaving and valley filling, thus alleviating the power supply pressure on the power grid while maximizing economic benefits. Second, when electricity demand surges, in addition to the energy storage battery supplying power to each bidirectional DC / DC module through the DC bus, the bidirectional AC / DC module can also supply power to each bidirectional DC / DC module through the DC bus, achieving dynamic capacity expansion and removing charging limitations. Third, by using the DC bus to connect the energy storage battery, the bidirectional AC / DC module, and each bidirectional DC / DC module respectively, compared with the prior art, since the energy storage battery can be connected to the bidirectional AC / DC module without the need for a bidirectional DC / DC module, costs can be reduced and installation space can be minimized. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an integrated storage and charging system provided in an embodiment of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] The concept of this utility model is to build an integrated energy storage and charging system by using a bidirectional AC / DC module, a bidirectional DC / DC module, and a battery.

[0027] Specifically, it includes an energy storage battery, a DC bus, a bidirectional AC / DC module with a three-phase four-wire AC side capable of AC / DC conversion, and several bidirectional DC / DC modules capable of high-low voltage conversion. The charging and discharging ports of the energy storage battery are connected to the DC side of the bidirectional AC / DC module via the DC bus. The first DC side of the bidirectional DC / DC module is connected in parallel to the DC bus. The AC side of the bidirectional AC / DC module is used to connect to the power grid. The second DC side of the bidirectional DC / DC module is used to connect to a V2G DC charging pile.

[0028] An embodiment of an integrated storage and charging system:

[0029] Figure 1 This is a schematic diagram of the structure of an integrated storage and charging system provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the integrated energy storage and charging system includes: an energy storage battery 10, a DC bus, a bidirectional AC / DC module 20, and several bidirectional DC / DC modules.

[0030] Specifically, the charging and discharging port of the energy storage battery 10 is connected to the DC side of the bidirectional AC / DC module 20 via a DC bus; the first DC side of the bidirectional DC / DC module is connected in parallel to the DC bus; the AC side of the bidirectional AC / DC module 20 is used to connect to the power grid; and the second DC side of the bidirectional DC / DC module is used to connect to a V2G DC charging pile.

[0031] Specifically, the first DC side of the bidirectional DC / DC converter is connected to the DC bus in parallel as follows: the positive terminal of the first DC side of each bidirectional DC / DC module is connected to the same positive connection line, and the negative terminal of the first DC side of each bidirectional DC / DC module is connected to the same negative connection line; the negative connection line is connected to the negative bus through the first connection line, and the positive connection line is connected to the positive DC bus through the second connection line.

[0032] The energy storage battery 10 is used to provide power to the bidirectional AC / DC module 20 and each bidirectional DC / DC module to alleviate the power supply pressure on the power grid. It also stores the power provided by the bidirectional AC / DC module 20 and each bidirectional DC / DC module to achieve peak shaving and valley filling, maximizing economic benefits. When the energy storage battery 10 provides power to the bidirectional AC / DC module 20 and each bidirectional DC / DC module, it can provide power to both simultaneously, or only to the bidirectional AC / DC module 20 or only to each bidirectional DC / DC module; this invention does not impose any particular limitation in this regard. Similarly, when the bidirectional AC / DC module 20 and each bidirectional DC / DC module provide power to the energy storage battery 10, they can do so simultaneously, or only the bidirectional AC / DC module 20 or only each bidirectional DC / DC module can provide power; this invention does not impose any particular limitation in this regard.

[0033] The voltage level of the energy storage battery 10 is consistent with the voltage level of the DC side of the bidirectional AC / DC converter, so as to ensure that the energy storage battery 10 can be fully charged in the shortest time.

[0034] The energy storage battery 10 comprises several battery packs connected in series. This invention does not specifically limit the number of battery packs; the following explanation will use three battery packs as an example.

[0035] Specifically, the first, second, and third battery packs are connected in series, with the positive terminal of the first battery pack connected to the positive DC bus and the negative terminal of the third battery pack connected to the negative DC bus.

[0036] Each battery pack includes multiple battery cells connected in series. In order to realize the real-time acquisition of battery cell voltage and temperature and real-time monitoring of the health status of the energy storage battery 10, as an optional implementation method, a corresponding battery management unit (BMU) is connected in parallel at both ends of each battery pack.

[0037] Since this embodiment is illustrated using a battery pack with three units, there are also three battery management units: a first battery management unit (BMU1), a second battery management unit (BMU2), and a third battery management unit (BMU3).

[0038] Specifically, the first battery management unit (BMU1) is connected in parallel across the two ends of the first battery pack, the second battery management unit (BMU2) is connected in parallel across the two ends of the second battery pack, and the third battery management unit (BMU3) is connected in parallel across the two ends of the third battery pack.

[0039] The bidirectional AC / DC module 20 has single-phase load capacity, and the AC side adopts a three-phase four-wire system. Port A on the AC side of the bidirectional AC / DC module 20 is connected to the A-phase live wire in the power grid, port B on the AC side of the bidirectional AC / DC module 20 is connected to the B-phase live wire in the power grid, port C on the AC side of the bidirectional AC / DC module 20 is connected to the C-phase live wire in the power grid, and port D on the AC side of the bidirectional AC / DC module 20 is connected to the neutral wire in the power grid.

[0040] To meet users' charging preferences or needs, as an optional implementation, the AC side of the bidirectional AC / DC module 20 is also used to connect to an AC charging pile.

[0041] When the AC side of the bidirectional AC / DC module 20 is connected to an AC charging pile, the D port on the AC side can be connected to the AC charging pile in combination with any of the A, B, and C ports on the AC side. Essentially, the neutral wire is connected to any live wire to the AC charging pile, thereby enabling the charging pile to output AC current so that the user can choose to charge the electric vehicle with AC power or DC power.

[0042] Among them, the bidirectional AC / DC module 20 can be any existing electrical component capable of AC / DC conversion.

[0043] The bidirectional AC / DC module 20, capable of AC / DC conversion, can convert AC power from the grid into DC power during periods of low electricity prices. This DC power is then simultaneously supplied to the energy storage battery 10 and each bidirectional DC / DC module via a DC bus. The energy storage battery 10 stores energy. The bidirectional DC / DC module connected to the DC charging pile can use the DC voltage converted from the AC grid voltage provided by the bidirectional AC / DC module to ensure the normal operation of the DC charging pile. Alternatively, it can convert AC power from the AC charging pile into DC power and supply it to both the energy storage battery 10 and each bidirectional DC / DC module. Conversely, during peak electricity consumption periods, the bidirectional AC / DC module 20 can convert the DC power supplied by the energy storage battery 10 into AC power, supplying it to the grid and / or the AC charging pile to achieve dynamic capacity expansion and ensure that the AC charging pile can provide normal power to electric vehicles.

[0044] The bidirectional AC / DC module 20 can provide 20 kilowatts (kW) of power to each bidirectional DC / DC module, and the power can be higher or lower. This utility model does not make any special limitation in this regard.

[0045] Each bidirectional DC / DC module is capable of converting between high and low voltage DC. When the first DC side of each bidirectional DC / DC module is a high-voltage DC side, the second DC side of each bidirectional DC / DC module is a low-voltage DC side; when the first DC side of each bidirectional DC / DC module is a low-voltage DC side, the second DC side of each bidirectional DC / DC module is a high-voltage DC side. This invention does not make any special limitation on whether the first DC side of each bidirectional DC / DC module is a high-voltage or low-voltage DC side, nor does it make any special limitation on whether the second DC side of each bidirectional DC / DC module is a low-voltage or high-voltage DC side. The choice can be made according to the actual situation, as long as the voltage levels on both sides are not consistent. The following description will be based on the example of each bidirectional DC / DC module having a high-voltage DC side and a low-voltage DC side.

[0046] For example, during peak electricity consumption periods, each bidirectional DC / DC module can convert the high-voltage DC power supplied by the energy storage battery 10 into low-voltage DC power to power the V2G DC charging station, thereby achieving dynamic capacity expansion and ensuring that the V2G DC charging station can provide normal power to electric vehicles. Alternatively, the low-voltage DC power from the V2G DC charging station can be converted into high-voltage DC power and output to the energy storage battery 10 for energy storage.

[0047] Among them, it is possible to select several bidirectional DC / DC modules and connect their low-voltage DC sides to the same DC charging pile to adjust the power of the DC charging pile.

[0048] In order to make full use of new energy sources and increase revenue, as an optional implementation method, the second DC side of the bidirectional DC / DC module is also used to connect in parallel with the photovoltaic DC / DC module used to connect the photovoltaic panel.

[0049] The bidirectional DC / DC module connected in parallel with the photovoltaic DC / DC module can be a bidirectional DC / DC module connected to a V2G DC charging pile, or it can be a bidirectional DC / DC module not connected to a V2G DC charging pile. This utility model does not make any special limitation in this regard.

[0050] If the photovoltaic panel has energy storage function, the photovoltaic DC / DC module can be a bidirectional photovoltaic DC / DC module; if the photovoltaic panel does not have energy storage function, the photovoltaic DC / DC module can be a unidirectional photovoltaic DC / DC module.

[0051] When connected in parallel with a photovoltaic DC / DC module for connecting photovoltaic panels, the photovoltaic power can be supplied to a DC charging pile, converted into high-voltage DC power and transmitted to the energy storage battery 10, or supplied to a bidirectional AC / DC module when there is sufficient sunlight.

[0052] To improve the flexibility and user satisfaction of the integrated energy storage and charging system, as an optional implementation, the charging and discharging port of the energy storage battery 10 is provided with a normally open contact of the first circuit breaker QF1, and the DC bus is connected to the normally open contact of the first circuit breaker QF1.

[0053] Specifically, the first set of normally open contacts of the first circuit breaker QF1 is connected in series on the connection line between the positive terminal of the first battery pack in the energy storage battery 10 and the positive DC bus, and the second set of normally open contacts of the first circuit breaker QF1 is connected in series on the connection line between the negative terminal of the third battery pack in the energy storage battery 10 and the negative DC bus.

[0054] As an optional implementation, the bidirectional AC / DC module 20 is provided with a DC switch QS1 on the DC side and an AC switch QS2 and a surge protector FV1 on the AC side. The DC bus is connected to the DC side of the bidirectional AC / DC module 20 through the DC switch QS1, and the AC side of the bidirectional AC / DC module 20 is connected to the power grid and / or an AC charging pile through the surge protector FV1 and the AC switch QS2.

[0055] The DC switch QS1 includes four normally open disconnect switches. One disconnect switch is connected in series on the connection line between the negative DC bus and the negative terminal of the DC side of the bidirectional AC / DC module 20. The remaining three disconnect switches are connected in series in turn and then connected in series on the connection line between the positive DC bus and the positive terminal of the DC side of the bidirectional AC / DC module 20.

[0056] The AC switch QS2 includes four normally open disconnectors, three of which are connected in series on the AC side of the bidirectional AC / DC module 20 for connection to the three-phase live wires of the power grid, and the remaining disconnector is connected in series on the AC side of the bidirectional AC / DC module 20 for connection to the neutral wire of the power grid.

[0057] As an optional implementation, the normally open contact of the second circuit breaker QF2 is provided on the connection line used to connect the parallel bidirectional DC / DC converter to the DC bus.

[0058] Specifically, the first set of normally open contacts of the second fuse QF2 is connected in series on the first connecting line, and the second set of normally open contacts of the second fuse QF2 is connected in series on the second connecting line.

[0059] Among them, the normally open contacts of the first circuit breaker QF1, the normally open contacts of the second circuit breaker QF2, the DC switch QS1, and the AC switch QS2 can be flexibly configured according to the charging needs of electric vehicles, user needs, and grid conditions, and coordinated control can be achieved through control algorithms.

[0060] To protect the components on the DC side, as an optional implementation, a first DC fuse FUSE1 is provided on the connection line between the positive terminal of the DC bus and the positive terminal of the DC side of the bidirectional AC / DC module 20; a second DC fuse FUSE2 is provided on the connection line between the negative terminal of the DC bus and the negative terminal of the DC side of the bidirectional AC / DC module 20. DC fuses are also provided on the connection lines used to connect the parallel bidirectional DC / DC converter to the DC bus, i.e., a third DC fuse FUSE3 is provided on the first connection line, and a fourth DC fuse FUSE4 is provided on the second connection line.

[0061] To reduce the damage of the starting current to each bidirectional DC / DC module, as an optional implementation, a starting resistor is provided on the connection line for connecting the parallel bidirectional DC / DC to the DC bus, that is, a first starting resistor RS1 is provided on the first connection line and a second starting resistor RS2 is provided on the second connection line.

[0062] This utility model provides an integrated energy storage and charging system, including an energy storage battery, a DC bus, a bidirectional AC / DC module with a three-phase four-wire AC side capable of AC / DC conversion, and several bidirectional DC / DC modules capable of high-low voltage conversion. The charging and discharging ports of the energy storage battery are connected to the DC side of the bidirectional AC / DC module via the DC bus. The first DC side of the bidirectional DC / DC module is connected in parallel to the DC bus. The AC side of the bidirectional AC / DC module is used to connect to the power grid. The second DC side of the bidirectional DC / DC module is used to connect to a V2G DC charging pile. The integrated energy storage and charging system provided by this utility model has several advantages. First, the bidirectional AC / DC module and each bidirectional DC / DC module can output DC current to the energy storage battery through the DC bus, allowing the energy storage battery to store energy. The energy storage battery can also supply power to each bidirectional DC / DC module and the bidirectional AC / DC module through the DC bus, achieving peak shaving and valley filling, thus alleviating the power supply pressure on the grid while maximizing economic efficiency. Second, when electricity demand surges, in addition to the energy storage battery supplying power to each bidirectional DC / DC module through the DC bus, the bidirectional AC / DC module can also supply power to each bidirectional DC / DC module through the DC bus, achieving dynamic capacity expansion and removing charging limitations. Third, by using the DC bus to connect the energy storage battery, the bidirectional AC / DC module, and each bidirectional DC / DC module respectively, compared with the prior art, since the energy storage battery can be connected to the bidirectional AC / DC module without the need for a bidirectional DC / DC module, costs can be reduced and installation space can be minimized.

[0063] An embodiment of a charging station:

[0064] This utility model provides a charging station, including an integrated energy storage and charging system.

[0065] For a detailed description of the "integrated storage and charging system", please refer to the relevant description in the aforementioned "An Embodiment of an Integrated Storage and Charging System", which will not be repeated here.

[0066] The charging station provided by this utility model can achieve the same beneficial effects as the aforementioned integrated storage and charging system, which will not be described in detail here.

Claims

1. A storage and charging integrated machine system, characterized in that, The energy storage battery, a direct current bus, a three-phase four-wire system AC side, a bidirectional AC / DC module capable of AC / DC conversion, and a plurality of bidirectional DC / DC modules capable of high-low voltage conversion are included. The charge-discharge port of the energy storage battery is connected with the direct current side of the bidirectional AC / DC module through the direct current bus; the first direct current side of the bidirectional DC / DC is connected in parallel and then connected to the direct current bus; the AC side of the bidirectional AC / DC module is used for connecting the power grid; the second direct current side of the bidirectional DC / DC module is used for connecting the V2G direct current charging pile.

2. The system of claim 1, wherein, The AC side of the bidirectional AC / DC module is also used for connecting the alternating current charging pile.

3. The system of claim 1, wherein, The second direct current side of the bidirectional DC / DC module is also used for connecting the photovoltaic DC / DC module for connecting the photovoltaic panel in parallel.

4. The system of claim 1, wherein, The energy storage battery includes a plurality of battery groups connected in series.

5. The system of claim 4, wherein, Both ends of each battery group are connected in parallel with a corresponding battery management unit.

6. The system of claim 1, wherein, The charge-discharge port of the energy storage battery is provided with the normally open contact of the first circuit breaker; the direct current bus is connected with the normally open contact of the first circuit breaker.

7. The system of claim 1, wherein, The direct current side of the bidirectional AC / DC module is provided with a direct current switch; the direct current bus is connected with the direct current side of the bidirectional AC / DC module through the direct current switch. The AC side of the bidirectional AC / DC module is provided with an alternating current switch; the AC side of the bidirectional AC / DC module is connected with the power grid through the alternating current switch. The AC side of the bidirectional AC / DC module is also provided with an alternating current surge protector.

8. The system of claim 1, wherein, A first direct current fuse is arranged on the connection line between the positive pole of the direct current bus and the positive pole of the direct current side of the bidirectional AC / DC module; a second direct current fuse is arranged on the connection line between the negative pole of the direct current bus and the negative pole of the direct current side of the bidirectional AC / DC module.

9. The system of claim 1, wherein, A direct current fuse, the normally open contact of the second circuit breaker, and a starting rheostat are arranged on the connection line for connecting the parallel bidirectional DC / DC to the direct current bus.

10. A charging station, characterized in that, The system includes the integrated charging and storing machine system as claimed in any one of claims 1-9.

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