Storage and charging system and charging station

Abstract

A storage and charging system (100) and a charging station (1000). The storage and charging system (100) comprises at least one first direct-current conversion module (10), at least one second direct-current conversion module (11) and at least one charging port (12), wherein a first end of each of the at least one second direct-current conversion module (11) is connected to a direct-current bus (26), the direct-current bus (26) is suitable for being connected to an alternating-current power grid (24), and a second end of each second direct-current conversion module (11) is connected to the at least one charging port (12); and a first end of each of the at least one first direct-current conversion module (10) is configured to be connected to an energy storage device (13), and a second end of each first direct-current conversion module (10) is connected to the at least one charging port (12), such that the energy storage device (13) performs discharging by means of the at least one charging port (12). During the charging and discharging of the energy storage device (13), electric energy is not required to pass through the second direct-current conversion module (11), and the energy storage device (13) only undergoes one conversion during charging and discharging, such that the loss is low, and the efficiency is high. The requirements for the maximum power of the second direct-current conversion module (11) are low, such that the volume and the cost can be reduced.

Description

Storage and charging systems and charging stations

[0001] This application claims priority to Chinese patent application No. 202411013481.X, filed on July 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of power electronics technology, and in particular to a power storage and charging system and a charging station. Background Technology

[0003] With the continuous increase in the number of electric vehicles, their range and charging process have gradually become core issues of concern in the electric vehicle industry. Electric vehicle charging methods include fast charging, slow charging, wireless charging, and wired charging, utilizing charging piles, charging stations, and battery swapping stations. Current charging systems can obtain energy from various power sources such as the AC grid, energy storage batteries, and photovoltaic arrays. Power modules are used to convert electrical energy into the actual charging power required by the electric vehicle, thereby improving charging power and flexibility. Summary of the Invention

[0004] This disclosure provides a power storage and charging system and a charging station. In this system and station, higher charging power can be provided without the need for higher-specification power modules, thus reducing product size and cost.

[0005] Firstly, a storage and charging system is provided. This system includes at least one first DC-DC converter module, at least one second DC-DC converter module, and at least one charging port. A first terminal of each of the at least one second DC-DC converter modules is connected to a DC bus, which is adapted to connect to an AC power grid. A second terminal of each of the at least one second DC-DC converter modules is connected to the at least one charging port. The first terminal of each of the at least one first DC-DC converter modules is configured to connect to an energy storage device, and the second terminal of each first DC-DC converter module is connected to the at least one charging port, enabling the energy storage device to discharge through the at least one charging port. The energy storage device may include, but is not limited to, energy storage batteries, supercapacitors, etc.

[0006] In some embodiments of this disclosure, since each first DC-DC converter module can be connected to an energy storage device and at least one charging port, any energy storage device can be connected to at least one charging port through the first DC-DC converter module connected to the energy storage device. This allows the energy storage device to discharge through the charging port when the AC grid provides power to the charging port via the DC bus and the second DC-DC converter module, thus achieving fast charging. Furthermore, it can reduce the power requirements of the second DC-DC converter module, thereby reducing the overall size and cost.

[0007] Furthermore, the discharge process of the energy storage device does not require a second DC-DC converter module. Thus, the electrical energy from the energy storage device can be transmitted to the charging port after being converted by a single DC-DC converter module, resulting in high conversion efficiency, low energy loss, and improved energy utilization of the energy storage device.

[0008] In some embodiments, the energy storage and charging system further includes at least one first switch. The two ends of each of the at least one first switch are respectively connected to the DC bus and the second end of the first DC-DC converter module, so that the energy storage device can be charged or discharged through the DC bus when the first switch is turned on.

[0009] In some embodiments, the above-described energy storage and charging system further includes at least one second switch. The second terminal of each first DC-DC converter module is connected to the second terminal of the at least one second DC-DC converter module and the at least one charging port via the at least one second switch, so that the energy storage device discharges through the at least one charging port when the at least one second switch is turned on.

[0010] In some embodiments, any two of the at least one second switch are connected to different first DC-DC converter modules; the second end of each first DC-DC converter module is connected to one of the at least one second switch.

[0011] In this way, by setting up a switching unit, the energy output from multiple second DC-DC converter modules can be rationally distributed to each charging port to meet the charging needs of the devices to be charged. When the energy storage and charging system includes multiple charging ports, the switching unit can simultaneously output the energy from different second DC-DC converter modules to their respective charging ports, charging different devices simultaneously, thus improving the availability and charging flexibility of the energy storage and charging system. Devices to be charged can include electric vehicles, etc.

[0012] In some embodiments, at least two of the at least one second switch are connected to the same first DC-DC converter module; the second end of each first DC-DC converter module is connected to the at least one second switch.

[0013] In some embodiments, the at least one first DC-DC converter module includes a plurality of first DC-DC converter modules, and the above-mentioned energy storage and charging system further includes at least one third switch. The at least one third switch is sequentially connected between the second terminals of any two adjacent first DC-DC converter modules among the plurality of first DC-DC converter modules.

[0014] In some embodiments, the at least one second DC-DC converter module includes a plurality of second DC-DC converter modules, and the above-mentioned energy storage and charging system further includes a switch array, wherein the second ends of the plurality of second DC-DC converter modules are connected to the at least one charging port through the switch array.

[0015] In some embodiments, the switch array includes a plurality of fourth switches; each of the plurality of fourth switches is connected to a second terminal of one of the plurality of second DC-DC converter modules and a charging port of one of the at least one charging port.

[0016] The plurality of fourth switches satisfy at least one of the following: at least some of the fourth switches are not simultaneously connected to the same charging port and the same second DC-DC converter module; or, any one of the at least one charging port is connected to the at least one second DC-DC converter module through at least one fourth switch connected to the at least one charging port.

[0017] In some embodiments, the at least one charging port includes multiple charging ports, the at least one second DC-DC converter module includes multiple second DC-DC converter modules, and the energy storage and charging system further includes multiple fifth switches. The second end of each of the at least one first DC-DC converter module is connected to one of the multiple charging ports; the second end of each of the multiple second DC-DC converter modules is connected to one of the multiple charging ports. Any two adjacent charging ports are interconnected through one of the multiple fifth switches, so that when some or all of the fifth switches connected to the at least one DC-DC converter module are turned on, the energy storage device provides power to some or all of the multiple charging ports.

[0018] In some embodiments, the above-described energy storage and charging system further includes a plurality of sixth switches. A first terminal of each of the plurality of sixth switches is connected to a second terminal of the second DC-DC converter module and a terminal of one of the plurality of fifth switches. The second terminal of each of the plurality of sixth switches is connected to one of the plurality of charging ports. Any two of the plurality of sixth switches are connected to different charging ports, and any two of the sixth switches are connected to different second DC-DC converter modules, so that when the energy storage device connected to at least one first DC-DC converter module is turned on, and when some of the fifth switches are connected to some of the sixth switches are turned on, the energy storage device provides power to the charging ports connected to those fifth switches.

[0019] In some embodiments, the at least one first DC-DC converter module includes a plurality of first DC-DC converter modules, and the energy storage and charging system further includes at least one third switch. Any two adjacent first DC-DC converter modules are interconnected through one of the at least one third switch, so that the energy storage device connected to the plurality of first DC-DC converter modules supplies power to some or all of the charging ports when the at least one third switch is turned on and when some or all of the plurality of fifth switches are turned on.

[0020] In some embodiments, the above-described energy storage and charging system further includes at least one second switch. The second terminal of each first DC-DC converter module is connected to one of the plurality of charging ports via one of the at least one second switch, so that the energy storage device connected to the at least one first DC-DC converter module supplies power to some or all of the charging ports when the at least one second switch is turned on and when some or all of the plurality of fifth switches are turned on.

[0021] In some embodiments, the above-described energy storage and charging system further includes at least one target switch. The common terminal of any one of the at least one target switch is connected to the second terminal of one of the at least one first DC-DC converter modules. The first terminal of the target switch is connected to the DC bus, and the second terminal of the target switch is connected to the second terminal of one of the at least one second DC-DC converter modules and the at least one charging port. When the common terminal of the target switch is connected to the first terminal of the target switch, the common terminal of the target switch is disconnected from the second terminal of the target switch; when the common terminal of the target switch is connected to the second terminal of the target switch, the common terminal of the target switch is disconnected from the first terminal of the target switch.

[0022] The energy storage device is configured to be charged via the DC bus when the target switch connected to the first DC-DC converter module connected to the energy storage device is connected to the DC bus.

[0023] The energy storage device is configured to supply power to the charging port connected to the target switch when the target switch connected to the first DC-DC converter module to which the energy storage device is connected is connected to the second terminal of the second DC-DC converter module.

[0024] In some embodiments, the above-described energy storage and charging system further includes at least one target switch. The common terminal of any one of the at least one target switch is connected to the second terminal of one of the at least one first DC-DC converter modules and the second terminal of one of the at least one second DC-DC converter modules. The first terminal of the target switch is connected to the DC bus, and the second terminal of the target switch is connected to the at least one charging port. When the common terminal of the target switch is connected to the first terminal of the target switch, the common terminal of the target switch is disconnected from the second terminal of the target switch; when the common terminal of the target switch is connected to the second terminal of the target switch, the common terminal of the target switch is disconnected from the first terminal of the target switch.

[0025] The energy storage device is configured to be charged via the DC bus when the target switch connected to the first DC-DC converter module connected to the energy storage device is connected to the DC bus.

[0026] The energy storage device is configured to supply power to the charging port connected to the target switch when the target switch connected to the first DC-DC converter module connected to the energy storage device is connected to the at least one charging port.

[0027] In some embodiments, the above-described energy storage and charging system further includes a photovoltaic module and a third DC-DC converter module, wherein the photovoltaic module is connected to the DC bus via the third DC-DC converter module.

[0028] In some embodiments, the at least one charging port is adapted to discharge a device to be charged, the device to be charged including a mobile power device.

[0029] In some embodiments of this disclosure, the energy storage device can discharge to the charging port through a first DC-DC converter module connected to the energy storage device, and the DC bus can charge the energy storage device through the first DC-DC converter module. During the charging and discharging process of the energy storage device, the electrical energy does not need to pass through a second DC-DC converter module; the energy storage device undergoes only one conversion during charging and discharging, resulting in low loss and high efficiency. The maximum power requirement for the second DC-DC converter module is low, which can reduce size and cost.

[0030] Secondly, a charging station is provided. The charging station includes the aforementioned energy storage and charging system and an AC / DC conversion module. The AC terminal of the AC / DC conversion module is connected to the AC power grid, and the DC terminal of the AC / DC conversion module is connected to the DC bus. The AC / DC conversion module is configured to convert the AC power provided by the AC power grid into DC power and output it to the DC bus.

[0031] In some embodiments of the charging station disclosed herein, when the AC power grid provides power to the charging port via the DC bus and the second DC-DC converter module, the power provided by the energy storage device can also be converted by the first DC-DC converter module and output to the charging port, achieving fast charging. Furthermore, this reduces the power requirements of the second DC-DC converter module, thereby reducing the overall size and cost.

[0032] The electrical energy of the energy storage device does not need to go through a second DC-DC converter module, which avoids multi-stage conversion of the electrical energy of the energy storage device, resulting in low loss and high energy utilization. Attached Figure Description

[0033] Figure 1 is a structural diagram of a storage and charging system according to some embodiments;

[0034] Figure 2 is another structural diagram of a storage and charging system according to some embodiments;

[0035] Figure 3 is another structural diagram of the storage and charging system according to some embodiments;

[0036] Figure 4 is another structural diagram of the storage and charging system according to some embodiments;

[0037] Figure 5 is another structural diagram of the storage and charging system according to some embodiments;

[0038] Figure 6 is another structural diagram of the storage and charging system according to some embodiments;

[0039] Figure 7 is another structural diagram of the storage and charging system according to some embodiments;

[0040] Figure 8 is another structural diagram of the storage and charging system according to some embodiments;

[0041] Figure 9 is another structural diagram of the storage and charging system according to some embodiments;

[0042] Figure 10 is another structural diagram of a storage and charging system according to some embodiments;

[0043] Figure 11 is another structural diagram of a storage and charging system according to some embodiments;

[0044] Figure 12 is another structural diagram of a storage and charging system according to some embodiments;

[0045] Figure 13 is another structural diagram of the storage and charging system according to some embodiments;

[0046] Figure 14 is another structural diagram of the storage and charging system according to some embodiments;

[0047] Figure 15 is another structural diagram of the storage and charging system according to some embodiments;

[0048] Figure 16 is another structural diagram of the storage and charging system according to some embodiments;

[0049] Figure 17 is another structural diagram of the storage and charging system according to some embodiments;

[0050] Figure 18 is another structural diagram of the storage and charging system according to some embodiments;

[0051] Figure 19 is another structural diagram of a storage and charging system according to some embodiments;

[0052] Figure 20 is another structural diagram of a storage and charging system according to some embodiments;

[0053] Figure 21 is a structural diagram of a charging station according to some embodiments.

[0054] Reference numerals: 1000-charging station, 100-energy storage and charging system, 10-first DC-DC converter module, 11-second DC-DC converter module, 12-charging port, 13-energy storage device, 14-device to be charged, 15-first switch, 16-second switch, 21-third DC-DC converter module, 22-photovoltaic module, 23-AC / DC converter module, 24-AC power grid, 25-transformer, 26-DC bus. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described below with reference to the accompanying drawings.

[0056] The terms "first" and "second," etc., in this disclosure, claims, and drawings are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatuses.

[0057] The term "embodiment" as used herein means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Those skilled in the art will explicitly and implicitly understand that, unless otherwise specified or logically conflicting, at least one term or description in the various embodiments of this disclosure is consistent and can be mutually referenced, and technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0058] It should be understood that in this disclosure, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0059] Current charging systems often require high-power power modules to output higher charging power and improve charging speed, resulting in larger product size and higher cost. Therefore, this disclosure provides a charging storage system and charging station with some embodiments.

[0060] The energy storage and charging system and charging station provided in some embodiments of this disclosure are described below with reference to the accompanying drawings.

[0061] Referring to Figure 1, Figure 1 is a structural diagram of a power storage and charging system provided in some embodiments of this disclosure. The power storage and charging system 100 provided in some embodiments of this disclosure may include one or more first DC-DC converter modules, one or more second DC-DC converter modules, and one or more charging ports. In this power storage and charging system, the first end of each second DC-DC converter module 11 is connected to a DC bus 26, which can be used to connect to an AC power grid 24 through an AC / DC converter module 23 and a transformer 25. The second end of each second DC-DC converter module 11 is connected to at least one charging port 12. The first end of each first DC-DC converter module 10 is used to connect to an energy storage device 13, and the second end of each first DC-DC converter module 10 is connected to at least one charging port 12, so that the energy storage device can discharge through the charging port. Figure 1 shows the connection relationship between the first DC-DC converter modules, the second DC-DC converter modules, and the charging ports in this power storage and charging system.

[0062] Any of the charging ports 12 can be used to connect a device 14 to be charged. The device to be charged may include mobile electrical equipment, such as electric vehicles, two-wheeled electric vehicles, etc.

[0063] The charging port in this energy storage and charging system can provide different levels of charging power to the device being charged. That is, the charging port can include an overcharge port, a fast charge port, or a standard charging port, etc., and this disclosure does not impose any limitations on this. The charging port can obtain power from the DC bus through the second DC-DC converter module, or it can obtain power from the energy storage device connected to the first DC-DC converter module, and this disclosure does not impose any limitations on this either.

[0064] Energy storage device 13 can be a device for storing energy. Energy storage devices may include energy storage batteries or supercapacitors, etc.

[0065] In some embodiments, referring to FIG1, the energy storage and charging system further includes a photovoltaic module 22 and a third DC-DC converter module 21. The photovoltaic module 22 is connected to the DC bus 26 through the third DC-DC converter module 21. In this way, the photovoltaic module can also generate DC power and output it to the DC bus after conversion by the third DC-DC converter module to charge the device to be charged or the energy storage device.

[0066] It is understood that the energy storage and charging system in each embodiment provided in this disclosure may include the photovoltaic module and the third DC-DC converter module described above. The relevant descriptions of the photovoltaic module and the third DC-DC converter module in the figures of each embodiment below can be referred to the above description and will not be repeated here.

[0067] In some embodiments of this disclosure, since each first DC-DC converter module can connect to an energy storage device and at least one charging port, any energy storage device can be connected to at least one charging port through the first DC-DC converter module connected to it. This allows the energy storage device to discharge through the charging port when the AC grid provides power to the charging port via the DC bus and the second DC-DC converter module, thus achieving rapid charging. In this scheme, the energy storage device is directly connected to the charging port 12 through the first DC-DC converter module 10. Assuming the actual power requirement is 1000KW, the AC grid can provide 600KW, and the energy storage device provides 400KW. If both are connected to the charging port through the second DC-DC converter module, the maximum power requirement of the second DC-DC converter module would be 1000KW. However, in some embodiments of this disclosure, only the 600KW provided by the AC grid needs to be considered, thereby reducing the maximum power requirement of the second DC-DC converter module, reducing its size and cost, and thus reducing the size and cost of the entire energy storage and charging system.

[0068] Furthermore, the electrical energy in the energy storage device does not need to pass through a second DC-DC converter module during the discharge process. In this way, the electrical energy in the energy storage device can be transmitted to the charging port after being converted by a single DC-DC converter module, resulting in high conversion efficiency, low energy loss, and improved energy utilization of the energy storage device.

[0069] In some embodiments, the above-described energy storage and charging system may further include at least one first switch, with each first switch having its two ends connected to a DC bus and a second end of a first DC-DC converter module, respectively, so that the energy storage device can be charged or discharged through the DC bus when the first switch is turned on. Here, the first DC-DC converter module can be a bidirectional DC-DC converter, which can both obtain electrical energy from the energy storage device to power the charging port or the DC bus, and obtain electrical energy from the DC bus to charge the energy storage device.

[0070] For example, referring to Figure 2, which is another structural diagram of a storage and charging system provided in some embodiments of this disclosure. Figure 2 is derived from Figure 1, and shows the connection relationship between the first switch and other devices in the storage and charging system.

[0071] When the energy storage device 13 has a low battery level, the first switch 15 can be in the ON state. The electrical energy provided by the DC bus 26 can be transmitted to the energy storage device 13 through the ON first switch 15 and the first DC-DC converter module 10, charging the energy storage device 13. When the energy storage device 13 has a high battery level, the first switch 15 can be in the OFF state, breaking the direct path between the DC bus 26 and the first DC-DC converter module 10, and the DC bus 26 no longer charges the energy storage device 13. Additionally, the energy storage device can also discharge to the DC bus, at which point the first switch can also be in the ON state. Thus, by setting the first switch and controlling its state, the connection between the DC bus and the energy storage device can be turned on or off, allowing the energy storage device to be charged at appropriate times. Furthermore, the charging path is short, the electrical energy does not require multiple conversions, energy loss is low, and charging efficiency is high.

[0072] In some embodiments, the above-described energy storage and charging system may further include at least one second switch, wherein the second end of each first DC-DC converter module is connected to the second end of at least one second DC-DC converter module and at least one charging port through one or more second switches, so that the energy storage device discharges through the charging port when the second switch is turned on.

[0073] For example, referring to Figures 3 and 4, Figure 3 is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, and Figure 4 is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure. Figure 3 is derived based on Figure 1, and Figure 3 shows the connection relationship between the second switch and other devices in the energy storage and charging system. Figure 4 is derived based on Figure 2, and Figure 4 shows the connection relationship between the second switch and other devices in the energy storage and charging system.

[0074] As shown in Figures 3 and 4, the energy storage device 13 is connected to the second terminal of the second DC-DC converter 11 and the charging port 12 via the first DC-DC converter 10 and the second switch 16. When the second switch 16 is turned on, the energy storage device 13 can discharge to the charging port 12 through the first DC-DC converter 10 and the turned-on second switch 16, thereby charging the device 14 to be charged. The electrical energy output from the energy storage device to the charging port only undergoes conversion by the first DC-DC converter and does not need to be converted by the second DC-DC converter, thus resulting in high conversion efficiency, low energy loss, and improved energy utilization of the energy storage device. This also reduces the maximum power requirement of the second DC-DC converter, reduces its size and cost, and consequently reduces the size and cost of the energy storage and charging system.

[0075] Furthermore, in the energy storage and charging system 100 shown in Figure 3, the energy storage device 13 can obtain electrical energy from the DC bus 26 for charging through the first DC-DC converter module 10, the conducting second switch 16, and the second DC-DC converter module 11. This reduces the number of switches in the energy storage and charging system, simplifies the circuit structure, and lowers costs.

[0076] It is understood that Figures 1 to 4 only provide a simplified illustration of the connection relationships between the various components in the energy storage and charging system, and the number of each component shown does not constitute a limitation on the system. For example, Figure 4 shows only one box representing each type of component, such as the first switch, the second switch, the first DC-DC converter module, the second DC-DC converter module, the charging port, the energy storage device, and the device to be charged. However, the actual number of each type of component in the energy storage and charging system can be one or more, and it is not limited to having only one component of each type.

[0077] Referring to Figure 5, which is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, and which is derived from Figure 4. Figure 5 illustrates the energy storage and charging system by including a first switch and a second switch. AC-DC, DC-DC a1, DC-DC b1, DC-DC c1, Ka1, and Kb1 represent the AC / DC converter module, the first DC converter module, the second DC converter module, the third DC converter module, the first switch, and the second switch in the energy storage and charging system, respectively. The energy storage device in the energy storage and charging system includes energy storage device 1, the charging port includes charging port 1, and the device to be charged includes device to be charged 1. For ease of description, similar symbols are used to represent the converter modules and switches in the figures below.

[0078] In some embodiments, when the storage and charging system includes multiple second switches, any two second switches are connected to different first DC-DC converter modules; the second end of each first DC-DC converter module is connected to a second switch.

[0079] For example, see Figure 6. Figure 6 is another structural diagram of the storage and charging system provided in some embodiments of this disclosure, which is derived from Figure 4. Figure 6 illustrates a storage and charging system that includes a plurality of second switches (represented as m second switches in Figure 6, where m is an integer greater than or equal to 2).

[0080] The energy storage and charging system may include m second switches (Kb1 to Kbm) and m first DC-DC converter modules (DC-DC a1 to DC-DC am). The system may also include n second DC-DC converter modules (DC-DC b1 to DC-DC bn, where n is an integer greater than or equal to 2). Different second switches are connected to different first DC-DC converter modules. Each first DC-DC converter module's second terminal is connected to a second switch; for example, Kb1 is connected to the second terminal of DC-DC a1, Kb2 to the second terminal of DC-DC a2, ..., Kbm to the second terminal of DC-DC am. Figure 6 illustrates this system with m charging ports and m energy storage devices; however, the actual number of charging ports and energy storage devices is not limited. In Figure 6, any two second switches are connected to different second DC-DC converter modules.

[0081] In some embodiments of this disclosure, any energy storage device in the energy storage and charging system can discharge to the charging port through a first DC-DC converter module connected to the energy storage device and a second switch connected to the first DC-DC converter module. Different energy storage devices can discharge through their respective connected charging ports, thereby supplying power to different devices to be charged. The energy storage devices undergo only one conversion during charging or discharging, resulting in low loss and high efficiency. Furthermore, the maximum power requirement for the second DC-DC converter module is low, reducing size and cost.

[0082] In some embodiments, the energy storage and charging system may include a plurality of first DC-DC converter modules and at least one third switch. The at least one third switch is sequentially connected between the second terminals of any two adjacent first DC-DC converter modules. Here, two adjacent first DC-DC converter modules refer to those modules that are arranged in adjacent positions.

[0083] For example, referring to Figure 7, which is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, Figure 7 is derived from Figure 6. Figure 7 illustrates that the energy storage and charging system also includes multiple third switches (represented as m-1 third switches in Figure 7). In practice, the energy storage and charging system may also include m-2, m-3, ... or one third switch; this disclosure does not limit the number of third switches.

[0084] As shown in Figure 7, the energy storage and charging system may include m-1 third switches (i.e., Kc1 to Kc(m-1)). Kc1 can be connected between the second terminal of DC-DC a1 and the second terminal of DC-DC a2, Kc2 can be connected between the second terminal of DC-DC a2 and the second terminal of DC-DC a3, ..., Kc(m-1) can be connected between the second terminal of DC-DC a(m-1) and the second terminal of DC-DC am.

[0085] As shown in Figure 7, when some of the third and second switches are turned on, such as Kc1 and Kb1 being turned on and Kb2 being turned off, the energy from energy storage devices 1 and 2 can be pooled together and transmitted to the second terminal of DC-DC converter b1 through the turned-on Kb1. If the second terminal of DC-DC converter b1 is directly connected to charging port 1, this energy can be supplied to charging port 1. If the second terminal of DC-DC converter b1 is connected to charging port "X" through some of the turned-on switches in the switch array, this energy can be supplied to charging port "X". The energy from other energy storage devices, such as energy storage device m, can be transmitted through the corresponding turned-on second switch (such as Kbm) to the second terminal of the corresponding second DC-DC converter module (such as DC-DC converter bm), providing power to the charging port (such as charging port m) connected to the second terminal of the second DC-DC converter module.

[0086] In other words, by setting up multiple third switches, the energy from a certain number of energy storage devices can be pooled together using partially active third switches. This energy can then be transferred directly or through a switch array to specific charging ports via corresponding active second switches to meet the charging needs of the devices being charged, thereby improving charging efficiency. Energy storage devices not connected to active third switches can be individually connected to certain charging ports via their corresponding second switches to supply power to those ports. This allows for simultaneous power supply to different charging ports without interference between them, meeting varying charging demands and achieving good charging performance.

[0087] In some embodiments of this disclosure, by setting multiple third switches, the state of the third switches can be controlled to allow the energy of one or more energy storage devices to be pooled together to power the charging port connected to the energy storage devices. This allows for flexible adjustment of the output energy to meet various charging needs of the devices to be charged. The circuit control is convenient and does not increase the size and volume of the second DC-DC converter module, which helps to reduce the size and cost of the energy storage and charging system.

[0088] In other embodiments, the aforementioned plurality of third switches may also be configured in a energy storage and charging system that does not include a second switch or includes only one second switch. In this system, the third switch is connected between the second terminals of any two adjacent first DC-DC converter modules. The energy from all energy storage devices connected to the first DC-DC converter modules can be pooled together via the third switch and directly transmitted or transmitted to the charging port side via the second switch. This achieves energy pooling, increases output power, and helps meet the various charging needs of the devices to be charged. Once the pooled energy is transmitted to the charging port side, it can be transmitted to a specific charging port via a switch on the charging port side. An example of this energy storage and charging system can be seen in the relevant description in Figure 17 below, and will not be elaborated upon here.

[0089] In some embodiments, the above-described energy storage and charging system may include a plurality of second switches, and at least two of the second switches are connected to the same first DC-DC converter module, with the second end of each first DC-DC converter module connected to at least one second switch.

[0090] For example, referring to Figures 8 and 9, Figure 8 is another structural diagram of the storage and charging system provided in some embodiments of this disclosure, and Figure 9 is another structural diagram of the storage and charging system provided in some embodiments of this disclosure. Both Figures 8 and 9 are derived based on Figure 4. Figures 8 and 9 illustrate the storage and charging system by including a plurality of second switches (represented as t second switches in Figures 8 and 9).

[0091] Referring to Figure 8, the energy storage and charging system may include t second switches (i.e., Kb1 to Kbt) and m first DC-DC converter modules (i.e., DC-DC a1 to DC-DC am). At least two second switches are connected to the same first DC-DC converter module, and the second terminal of each first DC-DC converter module is connected to at least one second switch. For example, Kb1 is connected to the second terminal of DC-DC a1, and Kb(t-1) and Kbt are both connected to the second terminal of DC-DC am.

[0092] In some embodiments of this disclosure, by setting multiple second switches in the energy storage and charging system, and by connecting some first DC-DC converter modules to multiple second switches, different charging ports can obtain energy from the same energy storage device, thereby realizing the reuse of the energy storage device, reducing the number of energy storage devices and first DC-DC converter modules, and reducing the size and cost of the energy storage and charging system.

[0093] As shown in Figure 9, the energy storage and charging system may include t second switches (i.e., Kb1 to Kbt) and one first DC-DC converter module (i.e., DC-DC a1). At least two second switches are connected to the same first DC-DC converter module, and the second terminal of each first DC-DC converter module is connected to at least one second switch. For example, Kb1 to Kbt are all connected to the second terminal of DC-DC a1.

[0094] In some embodiments of this disclosure, multiple second switches are connected to the same first DC-DC converter module, which allows different charging ports to obtain energy from the energy storage device connected to the first DC-DC converter module, thereby enabling the reuse of the energy storage device, greatly reducing the number of energy storage devices and the first DC-DC converter module, and significantly reducing the size and cost of the energy storage and charging system.

[0095] In some embodiments, the above-described energy storage and charging system may include a plurality of second DC-DC converter modules and a switch array. The second terminals of the plurality of second DC-DC converter modules are connected to one or more charging ports via the switch array. For example, referring to Figures 6 to 9, the energy storage and charging system may include a switch array that connects each second DC-DC converter module and a charging port.

[0096] In some embodiments of this disclosure, when one or more switches in the switch array are turned on, a path can be established between at least one of the first DC-DC converter modules or the second DC-DC converter modules and some charging ports. This allows the electrical energy from at least one of the energy storage devices or the DC bus to be transferred to the charging ports that require power supply, thus charging the devices to be charged. This achieves reasonable energy distribution, meets the charging needs of different devices to be charged, and improves the availability and charging flexibility of the energy storage and charging system. When the switches in the switch array are turned off, neither the first nor the second DC-DC converter modules can output electrical energy to the charging ports. This switch array allows the charging ports to receive or stop receiving electrical energy, providing convenience, flexibility, and simple control.

[0097] The switch array is illustrated below with reference to Figures 10 to 14. Figure 10 is derived from Figure 1, Figure 11 from Figure 2, Figure 12 from Figure 3, Figure 13 from Figure 9, and Figure 14 from Figure 4. The energy storage and charging system in Figures 10 to 14 may include multiple second DC-DC converter modules (e.g., DC-DC b1 to DC-DC b3), multiple charging ports (e.g., charging port 1 to charging port 3), and the switch array includes multiple fourth switches (e.g., Kd1 to Kd8). Each fourth switch is connected to a second terminal of a second DC-DC converter module and a charging port. At least two of the fourth switches are not simultaneously connected to the same charging port and the same second DC-DC converter module; or, any one charging port is connected to at least one second DC-DC converter module through at least one fourth switch connected to the charging port; or, at least two of the fourth switches are not simultaneously connected to the same charging port and the same second DC-DC converter module, and any one charging port is connected to at least one second DC-DC converter module through at least one fourth switch connected to the charging port.

[0098] For example, although switches Kd1 and Kd2 are connected to the same charging port 1, they are connected to different second DC-DC converter modules, DC-DC b1 and DC-DC b2, respectively. Similarly, although switches Kd1 and Kd4 are connected to the same second DC-DC converter module, DC-DC b1, they are connected to different charging ports 1 and 2, respectively. Charging port 1 can be connected to DC-DC b1, DC-DC b2, and DC-DC b3 via switches Kd1, Kd2, and Kd3, respectively. Charging port 2 can be connected to DC-DC b1, DC-DC b2, and DC-DC b3 via switches Kd4, Kd5, and Kd6, respectively. Charging port 3 can be connected to DC-DC b3 and DC-DC b2 via switches Kd7. Here, the eight fourth switches in this switch array are merely an example; the actual number of switches in the switch array is not limited. By setting up a switch array, any charging port can obtain power from the DC bus through one or more second DC converters when some switches in the switch array are turned on. This can increase the upper limit of the power that the charging port can obtain, meet the higher charging power requirements of the device to be charged, and improve charging efficiency.

[0099] Referring to Figure 10, the first DC-DC converter module DC-DC a1 is connected to the second terminals of the second DC-DC converter modules DC-DC b1, DC-DC b2, and DC-DC b3, respectively. Multiple second DC-DC converter modules are connected to charging ports 1 to 3 via switches Kd1 to Kd8 in the switch array. When switch Kd1 is on, the energy storage device 1 can discharge to charging port 1 via DC-DC a1. The discharge path of the energy storage device does not need to pass through any of the second DC-DC converter modules, resulting in low energy loss, high efficiency, and low power requirements for the second DC-DC converter modules, thereby reducing system size and cost. Furthermore, the DC bus can also discharge to the charging ports via other second DC-DC converter modules and the switch array. When the energy storage device and the DC bus simultaneously supply power to the charging ports, the efficiency is high and the speed is fast, meeting the charging needs of the device to be charged.

[0100] Referring to Figure 11, compared to Figure 10, Figure 11 adds a first switch Ka1. By controlling this first switch, the DC bus can be used to charge the energy storage device, reducing the number of energy conversions during charging and resulting in high charging efficiency.

[0101] Referring to Figure 12, compared to Figure 10, Figure 12 adds multiple second switches (Kb1 to Kb3 in Figure 12). By controlling these multiple second switches, the path between the energy storage device and the charging port can be opened when power is needed, allowing the energy storage device to supply power to the charging port at the appropriate time. Furthermore, when discharging is not required, controlling these multiple second switches can disconnect the path between the first and second DC-DC converter modules, preventing mutual interference between the modules and improving system safety and reliability.

[0102] Referring to Figure 13, compared to Figure 12, Figure 13 adds a first switch Ka1. This energy storage and charging system can improve both the discharge efficiency and charging efficiency of the energy storage device, and the system is highly safe and low in cost.

[0103] Referring to Figure 14, compared to Figure 13, Figure 14 adds two first DC-DC converter modules (DC-DC a2 and DC-DC a3 in Figure 14) and two energy storage devices (energy storage device 2 and energy storage device 3 in Figure 14). When one or more energy storage devices are connected to their respective first DC-DC converter modules, the electrical energy output from these energy storage devices can be pooled together to power the charging port, resulting in high output power, applicability to different charging needs, and high charging efficiency.

[0104] In some embodiments, the energy storage and charging system may include one or more first DC-DC converter modules, multiple charging ports, multiple second DC-DC converter modules, and multiple fifth switches. The second end of each of the one or more first DC-DC converter modules is connected to a charging port; the second end of each second DC-DC converter module is connected to a charging port; any two adjacent charging ports are interconnected via one of the multiple fifth switches, so that when some or all of the fifth switches are turned on, the energy storage device connected to the one or more first DC-DC converter modules can provide power to some or all of the charging ports simultaneously.

[0105] For example, referring to Figure 15, which is another structural diagram of a storage and charging system provided in some embodiments of this disclosure, Figure 15 is obtained based on Figure 2. One or more first DC-DC converter modules include DC-DC a1 to DC-DC am, where m can be an integer greater than or equal to 1. Multiple fifth switches may include switches Ke1 to Ke(t-1), and multiple charging ports include charging port 1 to charging port t, where t can be an integer greater than or equal to 2. Multiple second DC-DC converter modules include DC-DC b1 to DC-DC bn, where n can be a positive integer less than or equal to t. The storage and charging system may also include first switches Ka1 to Kam. Charging port 1 can be connected to charging port 2, ..., and charging port t-1 can be connected to charging port t via switch Ke(t-1).

[0106] In some embodiments of this disclosure, when all fifth switches are turned on, one end of multiple charging ports is connected together, and they can all receive the same electrical energy from the same energy storage device. Therefore, these charging ports can supply power to devices with the same charging requirements. By utilizing multiple fifth switches to provide power to multiple charging ports simultaneously, the need to charge multiple devices simultaneously can be met. When some adjacent fifth switches are turned on, these connected and adjacent charging ports can obtain the same electrical energy from the same energy storage device, thus supplying power to devices with the same charging requirements (e.g., the same charging voltage). Charging ports connected to non-turned fifth switches can obtain power from the DC bus individually through the second DC-DC converter module to supply power to devices with other charging requirements. This achieves both simultaneous power supply to multiple devices and satisfaction of different charging needs, resulting in high charging efficiency.

[0107] In some embodiments, the above-described energy storage and charging system may further include a plurality of sixth switches. The first end of each sixth switch is connected to the second end of the second DC-DC converter module and one end of a fifth switch, and the second end of each sixth switch is connected to a charging port; any two sixth switches are connected to different charging ports, and any two sixth switches are connected to different second DC-DC converter modules, so that when one or more first DC-DC converter modules are connected to energy storage devices, some of the fifth switches in the plurality of fifth switches are turned on, and when some of the sixth switches connected to some of the fifth switches are turned on, the charging ports connected to some of the sixth switches are jointly powered.

[0108] For example, referring to Figure 16, which is another structural diagram of a storage and charging system provided in some embodiments of this disclosure, Figure 16 is obtained based on Figure 15. The sixth switch includes switches Kf1 to Kft. Each sixth switch is connected between a charging port and a second DC-DC converter module. For example, Kf1 is connected between charging port 1 and DC-DC converter b1, and the first end of Kf1 is also connected to one end of Ke1.

[0109] In some embodiments of this disclosure, the connection between the charging port and the energy storage device or the second DC-DC converter module can be cut off by controlling the sixth switch. This simplifies control and improves system safety and reliability. Furthermore, by setting multiple sixth switches, the state of these switches can be controlled to open or close the path between the charging port and the energy storage device. When some or all of the fifth switches are open, the charging port can receive the same power supply. By further controlling the opening of some of the sixth switches connected to these fifth switches, the energy storage device can provide power to the devices connected to these charging ports, meeting the same charging requirements of these devices. Conversely, if the fifth switches connected to other charging ports are all closed, the charging port can obtain power from the DC bus independently through the second DC-DC converter module to power the devices connected to that charging port, meeting the individual charging requirements of those devices. This allows for both shared power supply to some devices and individual power supply to others, providing flexible power supply options.

[0110] In some embodiments, the above-described energy storage and charging system may include a plurality of first DC-DC converter modules and one or more third switches. Any two adjacent first DC-DC converter modules are interconnected through a third switch, so that when the energy storage devices connected to the plurality of first DC-DC converter modules are all turned on, and when some or all of the plurality of fifth switches are turned on, the energy storage devices provide power to some or all of the charging ports.

[0111] For example, referring to Figure 17, which is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, Figure 17 is obtained based on Figure 16. Multiple third switches include switches Kc1 to Kc(m-1), where switch Kc1 is connected between the second terminal of DC-DC a1 and the second terminal of DC-DC a2, ..., and switch Kc(m-1) is connected between the second terminal of DC-DC a(m-1) and the second terminal of DC-DC am. Here, m is an integer greater than or equal to 2. When switches Kc1 to Kc(m-1) are all turned on, the electrical energy of energy storage devices 1 to m can be converted by their respective connected first DC-DC converter modules and then aggregated and transmitted to the charging port side. At this time, if some or all of the multiple fifth switches Ke1 to Ke(t-1) located on the charging port side are turned on, and the sixth switch connected to these fifth switches is turned on, the m energy storage devices can connect to some or all of the charging ports, thereby allowing the m energy storage devices to jointly supply power to the partial or complete charging ports. When some of the switches from Kc1 to Kc(m-1) are turned on, the electrical energy from some of the energy storage devices can be pooled together and output to the charging port connected to these energy storage devices. For example, if all switches from Kc1 to Kc(m-1) are turned off, energy storage device m can supply power to the charging port. If only Kc(m-1) is turned on, the electrical energy from energy storage devices m-1 and m can be pooled together and output. The port where the electrical energy from energy storage device m is pooled can be called the pooling end. If one or more third switches adjacent to the pooling end are turned on, the electrical energy from the energy storage devices connected to these third switches can all be output to the pooling end and then to the charging port connected to the pooling end.

[0112] In this energy storage and charging system, by setting up multiple third and fifth switches, the electrical energy from multiple energy storage devices can be aggregated and then output to the charging ports that require power. This allows for the simultaneous supply of power to multiple charging ports, meeting the charging needs of multiple devices. This method offers high charging efficiency, a high upper limit of output power, and high charging flexibility.

[0113] In some embodiments, the above-described energy storage and charging system may include one or more first DC-DC converter modules and one or more second switches. The second end of each first DC-DC converter module is connected to a charging port through a second switch, so that when the second switch corresponding to the energy storage device connected to at least one first DC-DC converter module is turned on, and some or all of the fifth switches among the plurality of fifth switches are turned on, the energy storage device connected to at least one first DC-DC converter module can provide power to some or all of the charging ports together.

[0114] For example, referring to Figure 18, which is another structural diagram of a storage and charging system provided in some embodiments of this disclosure, Figure 18 is obtained based on Figure 16. The second switch may include switches Kb1 to Kbm, where m can be an integer greater than or equal to 1. The first end of switch Kb1 is connected to the second end of DC-DC a1, ..., the first end of switch Kbm is connected to the second end of DC-DC am, and the second ends of switches Kb1 to Kbm are all connected together. This connection point is called the converging end, and the converging end is connected to one end of the same charging port.

[0115] In some embodiments of this disclosure, when one or more second switches are turned on, the energy storage devices connected to these second switches can be converged to a convergence point. In this case, when some or all of the fifth switches in the energy storage and charging system are turned on, the aforementioned energy storage devices can supply power to the charging ports connected to these fifth switches. That is, by setting the second and fifth switches, the electrical energy of the energy storage devices can be converged, and the converged electrical energy can be used to supply power to multiple charging ports, thereby meeting the charging needs of the devices connected to these charging ports. This method has a high upper limit of output power, high charging efficiency, and high charging flexibility.

[0116] In some embodiments, the above-described energy storage and charging system further includes at least one target switch. The common terminal of any target switch is connected to the second terminal of a first DC-DC converter module. The first terminal of the target switch is connected to a DC bus. The second terminal of the target switch is connected to the second terminal of a second DC-DC converter module and at least one charging port. When the common terminal of the target switch is connected to the first terminal, the common terminal of the target switch is disconnected from the second terminal; when the common terminal of the target switch is connected to the second terminal, the common terminal of the target switch is disconnected from the first terminal. Any energy storage device is used to charge via the DC bus when the target switch connected to the first DC-DC converter module is connected to the DC bus; any energy storage device is used to supply power to the charging port connected to the target switch when the target switch connected to the first DC-DC converter module is connected to the second terminal of the second DC-DC converter module.

[0117] The target switch can be a single-pole double-throw switch, with the first and second ends of the target switch being the two stationary ends of the single-pole double-throw switch, and the common end of the target switch being the moving end of the single-pole double-throw switch; or, the target switch can include switch 1 and switch 2, with the first end of switch 1 being the first end of the target switch, the first end of switch 2 being the second end of the target switch, and the second ends of switch 1 and switch 2 being connected to form the common end of the target switch.

[0118] For example, referring to Figure 19, which is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, Figure 19 is derived from Figure 1. Taking a single-pole double-throw switch S as an example, the moving end of the single-pole double-throw switch S (moving end 3 in Figure 19) is connected to the second terminal of DC-DC a1, one stationary end of the single-pole double-throw switch (stationary end 1 in Figure 19) is connected to the DC bus, and the other stationary end of the single-pole double-throw switch (stationary end 2 in Figure 19) is connected to the second terminal of DC-DC b1 and the charging port 1.

[0119] In some embodiments of this disclosure, when the single-pole double-throw switch connects the first DC-DC converter module and the charging port, the first DC-DC converter module can convert the electrical energy from the energy storage device and output it to the charging port. In this case, the energy storage device does not need to undergo multiple conversions during discharge, resulting in low energy loss and high efficiency. It also reduces the maximum power requirement of the second DC-DC converter module, thereby reducing system size and cost. When the single-pole double-throw switch connects the first DC-DC converter module and the DC bus, the first DC-DC converter module can obtain electrical energy from the DC bus to charge the energy storage device. The charging path is short and control is convenient. A single-pole double-throw switch can control the discharge and charging process of the energy storage device, resulting in high efficiency, a simple circuit, and reduced system size and cost.

[0120] In some embodiments, the energy storage and charging system further includes at least one target switch. The common terminal of any target switch is connected to a second terminal of a first DC-DC converter module and a second terminal of a second DC-DC converter module. The first terminal of the target switch is connected to a DC bus, and the second terminal of the target switch is connected to at least one charging port. When the common terminal of the target switch is connected to the first terminal, the common terminal of the target switch is disconnected from the second terminal; when the common terminal of the target switch is connected to the second terminal, the common terminal of the target switch is disconnected from the first terminal. Any energy storage device is used to charge via the DC bus when the target switch connected to the first DC-DC converter module to which the energy storage device is connected is connected to the DC bus; any energy storage device is used to supply power to the charging port connected to the target switch when the target switch connected to the first DC-DC converter module to which the energy storage device is connected is connected to the charging port.

[0121] The target switch can be a single-pole double-throw switch, with the first and second ends of the target switch being the two stationary ends of the single-pole double-throw switch, and the common end of the target switch being the moving end of the single-pole double-throw switch; or, the target switch can include switch 3 and switch 4, with the first end of switch 3 being the first end of the target switch, the first end of switch 4 being the second end of the target switch, and the second ends of switch 3 and switch 4 being connected to form the common end of the target switch.

[0122] For example, referring to Figure 20, which is another structural diagram of the energy storage and charging system provided in some embodiments of this disclosure, Figure 20 is derived from Figure 1. Taking a single-pole double-throw switch S as an example, the moving end of the single-pole double-throw switch S (moving end 3 in Figure 20) is connected to the second end of DC-DC a1 and the second end of DC-DC b1, and the two stationary ends of the single-pole double-throw switch (stationary end 1 and stationary end 2 in Figure 20) are respectively connected to the DC bus and the charging port (charging port 1 in Figure 20).

[0123] In some embodiments of this disclosure, when the single-pole double-throw switch connects the first DC-DC converter module and the charging port, at least one of the first and second DC-DC converter modules can output electrical energy to the charging port. The energy storage device does not require multiple conversions during discharge, resulting in low energy loss and high efficiency. This also reduces the maximum power requirement of the second DC-DC converter module, thereby reducing system size and cost. When the single-pole double-throw switch connects the first DC-DC converter module and the DC bus, the first DC-DC converter module can obtain electrical energy from the DC bus to charge the energy storage device. This results in a short charging path and convenient control. A single-pole double-throw switch can control the discharge and charging process of the energy storage device, offering high efficiency, a simple circuit, and reduced system size and cost.

[0124] In some embodiments, the above-described energy storage and charging system further includes a switch matrix. The switch matrix connects the AC power grid, at least one energy storage device, at least one photovoltaic module, and at least one charging port to form different switch control strategies based on power supply demand, satisfying different interaction rules. The switch matrix may include the first switch, second switch, third switch, fourth switch, fifth switch, sixth switch, or any combination of any number of the above types of switches, or any combination of the above types of switches.

[0125] In some embodiments, the above-described energy storage and charging system further includes a first switch matrix and a second switch matrix. The first switch matrix is ​​connected to at least one energy storage device to form different energy supply strategies. The second switch matrix is ​​connected to at least one charging port to discharge the charging port. The first switch matrix and the second switch matrix are interconnected to enable the energy storage device to supply power to the charging port, or to share power supply with the AC power grid to the charging port.

[0126] Referring to Figure 21, which is a structural diagram of a charging station provided in some embodiments of this disclosure, the charging station 1000 provided in some embodiments of this disclosure may include a storage and charging system 100 as shown in any of Figures 1 to 20 and an AC / DC conversion module 23. This AC / DC conversion module can be used to convert AC power supplied by the AC power grid into DC power and output it to the DC bus. In this charging station, when the AC power grid provides power to the charging port via the DC bus and the second DC conversion module, the first DC conversion module can convert the power supplied by the energy storage device and output it to the charging port, which can reduce the power requirements of the second DC conversion module, thereby reducing the overall size and cost of the charging station.

[0127] Moreover, the energy stored in the device does not need to be converted by a second DC-DC converter module, which avoids the need for multiple stages of energy conversion, resulting in low losses and high energy utilization.

[0128] The above description is an exemplary embodiment of this disclosure. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this disclosure, and these improvements and modifications are also considered to be within the scope of protection of this disclosure.

Claims

1. A storage and charging system (100) comprising at least one first DC conversion module (10), at least one second DC conversion module (11), and at least one charging port (12); a first end of each of the at least one second DC conversion module (11) is connected to a DC bus (26) adapted to be connected to an AC power grid (24), a second end of each of the at least one second DC conversion module (11) is connected to the at least one charging port (12); a first end of each of the at least one first DC conversion module (10) is configured to be connected to a storage device (13), a second end of each of the at least one first DC conversion module (10) is connected to the at least one charging port (12) to enable the storage device (13) to discharge through the at least one charging port (12).

2. The storage and charging system (100) of claim 1, further comprising at least one first switch (15), two ends of each of the at least one first switch (15) are connected to the DC bus (26) and the second end of the first DC conversion module (10) respectively, to enable the storage device (13) to charge or discharge through the DC bus (26) when the first switch (15) is turned on.

3. The storage and charging system (100) of claim 1 or 2, further comprising at least one second switch (16), the second end of each of the at least one first DC conversion module (10) is connected to the second end of the at least one second DC conversion module (11) and the at least one charging port (12) through the at least one second switch (16), to enable the storage device (13) to discharge through the at least one charging port (12) when the at least one second switch (16) is turned on.

4. The depot-charging system (100) of claim 3, wherein, Any two of the at least one second switch (16) are connected to different first DC conversion modules (10); the second end of each of the at least one first DC conversion module (10) is connected to one of the at least one second switch (16).

5. The depot-charging system (100) of claim 3, wherein, At least two of the at least one second switch (16) are connected to the same first DC conversion module (10); the second end of each of the at least one first DC conversion module (10) is connected to the at least one second switch (16).

6. The refill system (100) according to any one of claims 1 to 5, wherein, The at least one first DC conversion module (10) comprises a plurality of first DC conversion modules (10), the storage and charging system (100) further comprises at least one third switch connected between the second ends of any two adjacent first DC conversion modules (10) of the plurality of first DC conversion modules (10) in sequence.

7. The refill system (100) according to any one of claims 1 to 6, wherein, The at least one second direct current conversion module (11) comprises a plurality of second direct current conversion modules (11), and the storage and charging system (100) further comprises a switch array, and the second ends of the plurality of second direct current conversion modules (11) are connected to the at least one charging port (12) through the switch array.

8. The depot-charging system (100) of claim 7, wherein, The switch array comprises a plurality of fourth switches, and each fourth switch of the plurality of fourth switches is connected to the second end of one second direct current conversion module (11) of the plurality of second direct current conversion modules (11) and one charging port (12) of the at least one charging port (12). The plurality of fourth switches satisfy at least one of the following conditions: Any two of at least some fourth switches of the plurality of fourth switches are not simultaneously connected to the same charging port (12) and the same second direct current conversion module (11); or Any charging port (12) of the at least one charging port (12) is connected to the at least one second direct current conversion module (11) through at least one fourth switch connected to the any charging port (12).

9. The refill system (100) according to claim 1 or 2, wherein The at least one charging port (12) comprises a plurality of charging ports (12), the at least one second direct current conversion module (11) comprises a plurality of second direct current conversion modules (11), and the storage and charging system (100) further comprises a plurality of fifth switches; the second ends of the at least one first direct current conversion module (10) are connected to one charging port (12) of the plurality of charging ports (12); the second ends of each second direct current conversion module (11) of the plurality of second direct current conversion modules (11) are connected to one charging port (12) of the plurality of charging ports (12); and any adjacent two charging ports (12) of the plurality of charging ports (12) are connected to each other through one fifth switch of the plurality of fifth switches, so that the energy storage device (13) connected to the at least one first direct current conversion module (10) supplies power to part or all of the plurality of charging ports (12) when part or all of the plurality of fifth switches are turned on.

10. The storage and charging system (100) of claim 9, further comprising a plurality of sixth switches, a first end of each sixth switch of the plurality of sixth switches being connected to the second end of the second direct current conversion module (11) and one end of one fifth switch of the plurality of fifth switches, and a second end of the each sixth switch being connected to one charging port (12) of the plurality of charging ports (12); any two sixth switches of the plurality of sixth switches are connected to different charging ports (12), and the any two sixth switches are connected to different second direct current conversion modules (11), so that the energy storage device (13) connected to the at least one first direct current conversion module (10) supplies power to the charging ports (12) connected to the part of the sixth switches when part of the plurality of fifth switches are turned on and the part of the fifth switches are connected to the part of the sixth switches are turned on.

11. The bulk charging system (100) according to claim 9 or 10, wherein The at least one first DC conversion module (10) includes a plurality of first DC conversion modules (10), and the storage and charging system (100) further includes at least one third switch, any two adjacent first DC conversion modules (10) in the plurality of first DC conversion modules (10) are connected to each other through one of the at least one third switch, and the energy storage devices (13) connected by the plurality of first DC conversion modules (10) are used to supply power to the charging ports (12) connected by part or all of the plurality of fifth switches when the at least one third switch is turned on and the part or all of the plurality of fifth switches are turned on.

12. The storage and charging system (100) according to claim 9 or 10, further comprising at least one second switch (16), and the second end of each first DC conversion module (10) is connected to one of the plurality of charging ports (12) through one of the at least one second switch (16), and the energy storage devices (13) connected by the at least one first DC conversion module (10) are used to supply power to the charging ports (12) connected by part or all of the plurality of fifth switches when the at least one second switch (16) is turned on and the part or all of the plurality of fifth switches are turned on.

13. The storage and charging system (100) according to claim 1, further comprising at least one target switch, a common terminal of any one of the at least one target switch being connected to a second terminal of one of the at least one first DC conversion module (10), a first terminal of the target switch being connected to the DC bus (26), a second terminal of the target switch being connected to a second terminal of one of the at least one second DC conversion module (11) and the at least one charging port (12); wherein, When the common end of the target switch is connected to the first end of the target switch, the common end of the target switch is disconnected from the second end of the target switch; when the common end of the target switch is connected to the second end of the target switch, the common end of the target switch is disconnected from the first end of the target switch; The energy storage device (13) is configured to be charged through the DC bus (26) when the target switch connected by the first DC conversion module (10) connected by the energy storage device (13) is connected to the DC bus (26); The energy storage device (13) is configured to supply power to the charging port (12) connected by the target switch when the target switch connected by the first DC conversion module (10) connected by the energy storage device (13) is connected to the second end of the second DC conversion module (11).

14. The charging system (100) according to claim 1, further comprising at least one target switch, a common terminal of any one of the at least one target switch being connected to a second terminal of one of the at least one first DC conversion module (10) and a second terminal of one of the at least one second DC conversion module (11), a first terminal of the target switch being connected to the DC bus (26), a second terminal of the target switch being connected to the at least one charging port (12); wherein, When the common end of the target switch is connected to the first end of the target switch, the common end of the target switch is disconnected from the second end of the target switch; when the common end of the target switch is connected to the second end of the target switch, the common end of the target switch is disconnected from the first end of the target switch; The energy storage device (13) is configured to be charged through the DC bus (26) when the target switch connected by the first DC conversion module (10) connected by the energy storage device (13) is connected to the DC bus (26); The energy storage device (13) is configured to supply power to the charging port (12) connected by the target switch when the target switch connected by the first DC conversion module (10) connected by the energy storage device (13) is connected to the at least one charging port (12).

15. The storage and charging system (100) according to any one of claims 1 to 14, further comprising a photovoltaic assembly (22) and a third DC conversion module (21), the photovoltaic assembly (22) connecting the DC bus (26) through the third DC conversion module (21).

16. The refill system (100) according to any one of claims 1 to 15, wherein, The at least one charging port (12) is adapted to discharge a device to be charged (14), the device to be charged (14) comprising a mobile electric device.

17. A charging station (1000) comprising a storage and charging system (100) according to any one of claims 1 to 16 and an AC / DC conversion module (23); an AC side of the AC / DC conversion module (23) being connected to the AC grid (24), a DC side of the AC / DC conversion module (23) being connected to the DC bus (26).

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