A dual-gun direct-current charging pile of an off-grid uninterruptible integrated energy storage system

Abstract

The utility model relates to charging pile technical field discloses a kind of integrated energy storage system's double-gun direct-current charging pile of off-grid uninterrupted operation, including energy storage management module, off-grid power conversion module and grid access switching control module, the energy storage management module includes battery pack, pre-charging resistance, fuse RS1 and high-voltage box, the off-grid power conversion module includes multiple DC / DC module, the grid access switching control module includes multiple circuit breaker, multiple AC / DC module, switching contactor and inverter, the energy storage management module is electrically connected with off-grid power conversion module, the off-grid power conversion module is electrically connected with double-gun power control assembly component.Off-grid power supply mode is quickly switched to when power grid is powered off in the utility model, the uninterrupted charging process is guaranteed, and the reliability and safety of system operation are improved simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, and in particular to a dual-gun DC charging pile of an integrated energy storage system that operates off-grid without interruption. Background Technology

[0002] The off-grid uninterrupted operation integrated energy storage system dual-gun DC charging pile is an independent charging device that does not rely on the national grid. It integrates photovoltaic power generation, energy storage batteries, and dual-gun DC charging modules to form a self-sufficient energy closed-loop system. This system has two core features: off-grid operation, providing stable power during grid failures or when there is no grid connection; and a dual-gun design, allowing simultaneous charging of two electric vehicles, significantly improving charging efficiency. The system employs intelligent energy management to optimize energy distribution, making it suitable for remote areas, parking lots, and highway service areas, providing green, efficient, and reliable charging services.

[0003] Existing charging stations rely on a single power supply from the power grid. When the power grid suddenly fails, the charging process is directly interrupted, which cannot guarantee the continuity of charging, affects the user experience, and cannot meet the emergency charging needs of important places such as hospitals and highway service areas. Moreover, the applicable scenarios are limited to areas with stable power supply, which restricts the practicality and coverage of charging stations. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a dual-gun DC charging pile with an integrated energy storage system that operates off-grid without interruption, aiming to improve the problem that charging piles can only operate when the grid is energized.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-gun DC charging pile for an off-grid uninterrupted operation integrated energy storage system, comprising an energy storage management module, an off-grid power conversion module, and a grid access switching control module. The energy storage management module includes a battery pack, a pre-charge resistor, a fuse RS1, and a high-voltage box. The off-grid power conversion module includes multiple DC / DC modules. The grid access switching control module includes multiple circuit breakers, multiple AC / DC modules, a switching contactor, and an inverter. The energy storage management module is electrically connected to the off-grid power conversion module, and the off-grid power conversion module is electrically connected to the grid access switching control module. The multiple AC / DC modules of the grid access switching control module and the multiple DC / DC modules of the off-grid power conversion module form a shared architecture through a DC bus. The off-grid power conversion module is electrically connected to a dual-gun power control component.

[0006] The above technical solution involves: suppressing battery charging and discharging surges through the pre-charge resistor in the energy storage management module, ensuring battery overcurrent safety through the RS1 fuse, achieving battery voltage and bus voltage adaptation through the DC / DC module of the off-grid power conversion module, completing AC / DC conversion of the grid with the AC / DC module of the grid access switching control module, and achieving rapid switching of power supply mode through the linkage of the switching contactor and inverter. Finally, by utilizing the shared DC bus architecture of the AC / DC and DC / DC modules, the connection from grid power supply to battery power supply is achieved when the grid is interrupted, ensuring uninterrupted charging.

[0007] Preferably, the dual-gun power control component includes a power superposition and coordination module and a dual-gun power distribution control module. The power superposition and coordination module includes a bus tie contactor. The power superposition and coordination module reuses multiple AC / DC modules in the grid access switching control module and multiple DC / DC modules in the off-grid power supply conversion module. The dual-gun power distribution control module includes multiple charging guns, multiple meters, multiple fuses, and multiple contactors. The power superposition and coordination module is electrically connected to the DC bus through the bus tie contactor. The dual-gun power distribution control module is electrically connected to the power superposition and coordination module.

[0008] The above technical solution reuses the existing AC / DC modules on the grid side and the DC / DC modules on the off-grid side, eliminating the need for additional independent power units. Combined with the bus contactor in the power superposition and coordination module, the power converted from the grid and the power adjusted by the battery are efficiently superimposed on the DC bus to meet high-power charging demands. Simultaneously, the dual-gun power distribution control module equips each charging gun with a dedicated meter, fuse, and contactor. This allows for metering of charging power, overcurrent protection from the fuse, and independent control of each charging gun's start / stop and power distribution via the contactor, enabling switching between simultaneous dual-gun charging and independent single-gun charging.

[0009] Preferably, one end of the shared plurality of DC / DC modules is electrically connected to the battery pack, and the other end is electrically connected to the DC bus.

[0010] The above technical solution involves multiple shared DC / DC modules connected at one end to the battery pack to obtain electrical energy, and at the other end electrically connected to the DC bus for output, thus realizing the conversion and transmission of electrical energy between the battery pack and the DC bus.

[0011] Preferably, one end of the shared multiple AC / DC modules is electrically connected to the power grid through multiple circuit breakers, and the other end is electrically connected to the DC bus.

[0012] The above technical solution involves connecting one end of multiple shared AC / DC modules to the power grid via multiple circuit breakers, which enable grid-side on / off control and anomaly protection. The other end connects to the DC bus to complete the conversion and transmission of AC to DC power, providing power support for stable system power supply and subsequent power superposition.

[0013] Preferably, the bus tie contactor is electrically connected to the DC bus and is used to control multiple shared AC / DC modules and multiple DC / DC modules.

[0014] The above technical solution involves connecting one end of the bus tie contactor to the shared AC / DC module and the output end of the DC / DC module, and connecting the other end to the DC bus, thereby achieving coordinated control of the two power sources.

[0015] Preferably, the switching contactor is electrically connected to multiple shared AC / DC modules and multiple DC / DC modules respectively, and is used to switch to independent power supply from the DC / DC modules when the power grid fails, and to switch to power supply from the AC / DC modules when the power grid is normal.

[0016] The above technical solution involves switching the contactor to link the AC / DC and DC / DC modules, quickly switching the power supply path according to the grid's on / off status, thus ensuring uninterrupted charging.

[0017] Preferably, the multiple charging guns are electrically connected to the DC bus via corresponding meters, fuses, and contactors, and the total power after superposition is distributed to the two charging guns via contactors.

[0018] The above technical solution achieves reasonable distribution of total power and safe charging through metering, fuse safety protection, and independent control of contactors, with the charging gun connected to the DC bus.

[0019] Preferably, the fuse RS1 is disposed between the battery pack and the shared DC / DC module, and the plurality of circuit breakers are disposed between the power grid and the shared AC / DC module.

[0020] The above technical solution involves placing the fuse RS1 between the battery pack and the DC / DC module, and placing the circuit breaker between the power grid and the AC / DC module to protect the safety of the circuits on both sides.

[0021] This utility model has the following beneficial effects: 1. In this utility model, through the coordinated cooperation of the energy storage management module, the off-grid power supply conversion module and the grid access switching control module, and with the help of the linkage control of the switching contactor and the inverter, as well as the shared architecture of the DC / DC module and the AC / DC module, the system can quickly switch to the off-grid power supply mode when the grid is interrupted, ensuring uninterrupted charging. At the same time, the system's reliability and safety are improved through the safety protection design of fuses and circuit breakers.

[0022] 2. In this utility model, by cooperating the bus contactor of the power superposition and coordination module with the dual-gun power distribution control module, the AC / DC module of the grid access switching control module and the DC / DC module of the off-grid power supply conversion module are reused to realize the superposition output of grid power and battery power, eliminating the problem of insufficient power supply from a single grid. At the same time, through the independent control of the meter contactor, the power distribution and power metering of the dual guns are realized to meet the needs of high-power charging. Attached Figure Description

[0023] Figure 1 This utility model presents a schematic block diagram of the energy storage management module of a dual-gun DC charging pile for an integrated energy storage system that operates uninterruptedly off-grid. Figure 2 This utility model presents a schematic block diagram of the off-grid power supply conversion module for a dual-gun DC charging pile of an integrated energy storage system that operates uninterruptedly off-grid. Figure 3 This utility model presents a schematic block diagram of the grid access switching control module for a dual-gun DC charging pile of an integrated energy storage system for uninterrupted off-grid operation. Figure 4 A schematic block diagram of the power superposition and coordination module of a dual-gun DC charging pile for an off-grid uninterrupted operation integrated energy storage system proposed in this utility model. Figure 5 A schematic block diagram of the dual-gun power distribution control module of a dual-gun DC charging pile for an off-grid uninterrupted operation integrated energy storage system proposed in this utility model. Figure 6 This is a circuit diagram of a dual-gun DC charging pile for an integrated energy storage system that operates continuously off-grid, as proposed in this utility model. Detailed Implementation

[0024] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Reference Figures 1-3This utility model provides an embodiment of a dual-gun DC charging pile for an off-grid uninterrupted operation integrated energy storage system, comprising an energy storage management module, an off-grid power conversion module, and a grid access switching control module. The energy storage management module includes a battery pack, a pre-charge resistor, a fuse RS1, and a high-voltage box. The off-grid power conversion module includes multiple DC / DC modules. The grid access switching control module includes multiple circuit breakers, multiple AC / DC modules, a switching contactor, and an inverter. The energy storage management module is electrically connected to the off-grid power conversion module, and the off-grid power conversion module is electrically connected to the grid access switching control module. The multiple AC / DC modules of the grid access switching control module and the multiple DC / DC modules of the off-grid power conversion module form a shared architecture through a DC bus. The off-grid power conversion module is electrically connected to a dual-gun power control component. Specifically, after the battery pack of the energy storage management module is integrated and output through the high-voltage box, it is connected in series with a pre-charge resistor and fuse RS1 before being connected to the DC / DC module of the off-grid power conversion module. The pre-charge resistor can suppress the surge current in the early stage of battery charging to avoid component damage. The fuse RS1 quickly blows when the circuit current is abnormal to achieve overcurrent protection on the battery side. The output terminal of the DC / DC module of the off-grid power conversion module and the output terminal of the AC / DC module of the grid access switching control module are connected to the same DC bus, forming a shared bus architecture, which reduces the hardware redundancy of independent power supply circuits and improves system integration. The input terminal of the AC / DC module of the grid access switching control module is connected to different power supply branches of the grid through circuit breakers QF2, QF3, QF4, and QF5. The circuit breakers can realize the grid-side power supply. The circuit switching control also provides protection against grid overload or short circuit. The switching contactor is electrically connected to the output terminals of the AC / DC module, the DC / DC module, and the DC bus. The inverter and the switching contactor are linked to detect the grid power supply status in real time. When the grid is normal, the switching contactor keeps the AC / DC module connected to the DC bus, ensuring that the grid power is stably transmitted to the load after being converted by the AC / DC module, and at the same time providing charging power to the battery pack. When the grid is de-energized, the inverter immediately triggers the switching contactor to switch the DC / DC module to be connected to the DC bus. The energy stored in the battery pack is adjusted to the appropriate voltage by the DC / DC module and then continuously supplies power, realizing seamless switching between grid and battery power supply, ensuring uninterrupted charging, and improving the safety and reliability of system operation.

[0026] Reference Figures 4-6The dual-gun power control component includes a power superposition and coordination module and a dual-gun power distribution control module. The power superposition and coordination module includes a bus tie contactor. The power superposition and coordination module reuses multiple AC / DC modules in the grid access switching control module and multiple DC / DC modules in the off-grid power supply conversion module. The dual-gun power distribution control module includes multiple charging guns, multiple meters, multiple fuses, and multiple contactors. The power superposition and coordination module is electrically connected to the DC bus through the bus tie contactor. The dual-gun power distribution control module is electrically connected to the power superposition and coordination module. Specifically, by reusing the two existing AC / DC modules in the grid access switching control module and the two DC / DC modules in the off-grid power supply conversion module, the input terminals of the bus tie contactor are electrically connected to the corresponding output terminals of the two AC / DC modules and the two DC / DC modules, respectively. The output terminals are fixedly electrically connected to the DC bus. This achieves the superposition of the grid power converted by the AC / DC module and the battery power regulated by the DC / DC module. Charging gun 1 is connected to the DC bus in series with the meter, fuse 1FU, and contactors 1K1 and 1K2. The second charging gun is connected to the DC bus via a series connection of a meter, fuse 2FU, and contactors 2K1 and 2K2. The dual-gun power distribution control module and the power superposition and coordination module are electrically connected to the DC bus. The meter measures the charging capacity of the corresponding charging gun. Fuses 1FU and 2FU blow quickly when the current in the corresponding charging branch is abnormal. Contactors 1K1, 1K2, 2K1, and 2K2 independently control the on / off state and power distribution of the corresponding charging gun. The system integration is improved through module reuse, and the power superposition meets the high-power charging requirements. The dual-gun independent circuit, together with dedicated protection and metering components, enables the switching between simultaneous dual-gun charging and independent single-gun charging.

[0027] Reference Figure 2 One end of the shared multiple DC / DC modules is electrically connected to the battery pack, and the other end is electrically connected to the DC bus; Specifically, the shared DC / DC module, after integrating the battery pack output through the high-voltage box, is connected in series with a pre-charge resistor and fuse RS1 before being electrically connected to the battery pack. The other end is directly connected to the DC bus. The pre-charge resistor suppresses the surge current during the initial charging and discharging of the battery pack, preventing damage to the DC / DC module and subsequent circuit components. Fuse RS1 blows quickly when an abnormal overcurrent occurs in the circuit, achieving overcurrent protection. The DC / DC module can adjust the output voltage of the battery pack to a voltage level compatible with the DC bus, ensuring electrical safety during the charging and discharging process of the battery pack. It can also deliver the stored electrical energy of the battery pack to the DC bus to continuously power the load when the power grid is interrupted.

[0028] Reference Figure 3One end of the shared multiple AC / DC modules is electrically connected to the power grid through multiple circuit breakers, and the other end is electrically connected to the DC bus. Specifically, the AC / DC modules are connected to different power supply branches of the power grid through corresponding circuit breakers, enabling the on / off control of the power grid side circuit. When the power grid experiences overload, short circuit, or other abnormalities, the circuit is cut off, providing safety protection. The AC / DC module at the other end can convert the AC power input from the power grid into DC power and transmit it to the DC bus, so that the power grid can supply power to DC loads and provide a power source for charging the battery pack.

[0029] Reference Figure 4 The bus tie contactor is electrically connected to the DC bus and is used to control multiple shared AC / DC modules and multiple DC / DC modules; Specifically, the on / off control enables the coordinated convergence of grid power converted by the AC / DC module and battery power regulated by the DC / DC module on the DC bus. When the grid power is sufficient, it can be output alone or in combination with battery power. When the grid power is insufficient, the battery power is added to make up for the shortfall.

[0030] Reference Figure 3 The switching contactor is electrically connected to multiple shared AC / DC modules and multiple DC / DC modules respectively, and is used to switch to independent power supply from the DC / DC modules when the power grid is interrupted, and to switch to power supply from the AC / DC modules when the power grid is normal. Specifically, when the power grid is normal, the switching contactor is connected to the AC / DC module and disconnected from the DC / DC module, ensuring that the power grid energy is supplied to the DC bus after being converted by the AC / DC module, and at the same time, it charges and stores energy for the battery pack; when the inverter detects a power grid failure, the switching contactor quickly acts, disconnecting the connection with the AC / DC module and closing the path with the DC / DC module, and the energy stored in the battery pack is continuously supplied to the DC bus after the voltage is regulated by the DC / DC module.

[0031] Reference Figure 5 Multiple charging guns are electrically connected to the DC bus via corresponding meters, fuses, and contactors. The total power after aggregation is distributed to two charging guns via contactors. Specifically, each branch circuit is connected in series with a dedicated meter, fuse, and contactor. The branch circuit for charging gun 1 includes meter 1, fuse 1FU, and contactors 1K1 and 1K2, while the branch circuit for charging gun 2 includes meter 2, fuse 2FU, and contactors 2K1 and 2K2. The total power after aggregation is collected on the DC bus. The system independently controls the on / off state of the contactors in each branch circuit to achieve power distribution and charging management for the two charging guns. It can support simultaneous charging of both guns or supply power to a single gun as needed.

[0032] Reference Figure 1Fuse RS1 is installed between the battery pack and the shared DC / DC module, and multiple circuit breakers are installed between the power grid and the shared AC / DC module. Specifically, fuse RS1 serves as a protective element for the battery-side circuit. It can quickly melt and disconnect the battery pack from subsequent circuits when abnormal overcurrent occurs during the charging and discharging process of the battery pack, thus preventing overcurrent damage to the DC / DC module and other core components. Each circuit breaker corresponds to a power grid branch, enabling independent on / off control of each branch. It can also quickly disconnect the corresponding branch when abnormalities such as overload or short circuit occur on the power grid side, preventing abnormal current from the power grid from entering the AC / DC module and ensuring the safe operation of the module.

[0033] Working principle: When the power grid is normal, the grid power is connected to the common AC / DC module of the grid access switching control module through multiple circuit breakers. After being converted into DC power, it is transmitted through the DC bus. On the one hand, it charges the battery pack of the energy storage management module through the common DC / DC module, the pre-charge resistor in the high-voltage box and the fuse RS1. On the other hand, it directly supplies power to the system. The switching contactor maintains the connection with the AC / DC module to ensure that the power supply path of the grid is unobstructed. When the inverter detects a power outage, the switching contactor disconnects from the AC / DC module and closes the connection with the common DC / DC module. The energy stored in the battery pack is regulated by the DC / DC module and then continuously supplies power to the system through the DC bus. The fuse RS1 and the circuit breaker provide overcurrent protection on the battery side and the grid side, respectively. Relying on the common architecture of the AC / DC module and the DC / DC module and the switching contactor, it realizes uninterrupted off-grid operation when the grid is interrupted. The power superposition and coordination module reuses the AC / DC module of the grid access switching control module and the DC / DC module of the off-grid power supply conversion module. It controls the coordinated output of the two power sources through a bus tie contactor. The grid power output from the AC / DC module and the battery power output from the DC / DC module are superimposed on the DC bus to form a higher total power output. In the dual-gun power distribution control module, the two charging guns are electrically connected to the DC bus through corresponding meters, fuses, and contactors. The superimposed total power is independently controlled by the contactor and distributed to the two charging guns. It can support simultaneous charging of both guns or high-power charging of a single gun, making up for the insufficient power of a single grid supply.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-gun DC charging pile with an integrated energy storage system for uninterrupted off-grid operation, comprising an energy storage management module, an off-grid power supply conversion module, and a grid access switching control module, characterized in that: The energy storage management module includes a battery pack, a pre-charge resistor, a fuse RS1, and a high-voltage box. The off-grid power conversion module includes multiple DC / DC modules. The grid access switching control module includes multiple circuit breakers, multiple AC / DC modules, a switching contactor, and an inverter. The energy storage management module is electrically connected to the off-grid power conversion module, and the off-grid power conversion module is electrically connected to the grid access switching control module. The multiple AC / DC modules of the grid access switching control module and the multiple DC / DC modules of the off-grid power conversion module form a shared architecture through a DC bus. The off-grid power conversion module is electrically connected to a dual-gun power control component.

2. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 1, characterized in that: The dual-gun power control component includes a power superposition and coordination module and a dual-gun power distribution control module. The power superposition and coordination module includes a bus tie contactor. The power superposition and coordination module reuses multiple AC / DC modules in the grid access switching control module and multiple DC / DC modules in the off-grid power supply conversion module. The dual-gun power distribution control module includes multiple charging guns, multiple meters, multiple fuses, and multiple contactors. The power superposition and coordination module is electrically connected to the DC bus through the bus tie contactor. The dual-gun power distribution control module is electrically connected to the power superposition and coordination module.

3. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 1, characterized in that: One end of the shared multiple DC / DC modules is electrically connected to the battery pack, and the other end is electrically connected to the DC bus.

4. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 1, characterized in that: One end of the shared multiple AC / DC modules is electrically connected to the power grid through multiple circuit breakers, and the other end is electrically connected to the DC bus.

5. A dual-gun DC charging pile for an off-grid uninterrupted operation integrated energy storage system according to claim 2, characterized in that: The bus tie contactor is electrically connected to the DC bus and is used to control multiple shared AC / DC modules and multiple DC / DC modules.

6. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 1, characterized in that: The switching contactor is electrically connected to multiple shared AC / DC modules and multiple DC / DC modules, respectively, and is used to switch to independent power supply from the DC / DC modules when the power grid is interrupted, and to switch to power supply from the AC / DC modules when the power grid is normal.

7. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 2, characterized in that: The multiple charging guns are electrically connected to the DC bus via corresponding meters, fuses, and contactors, and the total power after superposition is distributed to the two charging guns via contactors.

8. The dual-gun DC charging pile of an off-grid uninterrupted operation integrated energy storage system according to claim 1, characterized in that: The fuse RS1 is located between the battery pack and the shared DC / DC module, and multiple circuit breakers are located between the power grid and the shared AC / DC module.

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