Optical storage and off-grid devices

Abstract

This utility model relates to the field of energy storage technology, and in particular to a photovoltaic-storage off-grid device. An off-grid photovoltaic-storage device includes an integrated cabinet housing a battery pack, a PCS module, an STS module, and an EMS module. The STS module is connected to the power grid and the EMS module, and is used to detect the grid status and send a status signal to the EMS module when the grid is de-energized. The EMS module is used to control the PCS module to switch from grid-connected mode to off-grid mode based on the status signal, so that the battery pack can supply power to the load; it is also used to switch the PCS module back to grid-connected mode when the grid is restored.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a photovoltaic-storage-off-grid device. Background Technology

[0002] With the continuous development of renewable energy technologies, photovoltaic power generation and energy storage technologies have been widely applied in power systems. Traditional grid-connected or off-grid photovoltaic systems typically consist of multiple independent devices, such as separate battery storage cabinets, inverter cabinets, and grid switching devices. The independence between these system modules leads to drawbacks in installation, maintenance, and on-site construction, including complex wiring, large footprint, and inconsistent interfaces. Furthermore, in the event of grid faults or power outages, the system's response speed and stability when switching to off-grid power supply are insufficient to meet the requirements for high-reliability power supply. Especially in applications requiring high power supply continuity, traditional systems suffer from untimely switching and a significant risk of power outages. Utility Model Content

[0003] The purpose of this invention is to provide a photovoltaic energy storage off-grid device to address the shortcomings of existing technologies. It aims to solve the problems of traditional photovoltaic energy storage systems in terms of installation, maintenance and power supply switching, thereby achieving continuity and stability of load power supply when the grid is down.

[0004] The present invention achieves the above objectives through the following technical solution: a photovoltaic storage and off-grid device, comprising an integrated cabinet internally equipped with a battery pack, a PCS module, an STS module and an EMS module;

[0005] The STS module is connected to the power grid and the EMS module. It is used to detect the power grid status and send a status signal to the EMS module when the power grid is de-energized.

[0006] The EMS module is used to control the PCS module to switch from grid-connected mode to off-grid mode according to the status signal so that the battery pack can supply power to the load; it is also used to switch the PCS module back to grid-connected mode when the grid is restored.

[0007] As a further embodiment of this utility model: a photovoltaic switch is also provided in the cabinet, which is connected to the PCS module and whose photovoltaic energy input is controlled by the EMS module.

[0008] The EMS module is also used to control the input or distribution of photovoltaic energy based on the photovoltaic power generation connection status and the energy storage status of the battery pack, so as to realize uninterrupted power supply to the load from photovoltaic, battery and grid energy sources.

[0009] As a further embodiment of this utility model: the cabinet is also equipped with a power grid terminal, a load terminal, and a high-voltage box; the PCS module is electrically connected to the high-voltage box, and the high-voltage box is then connected to the battery pack and the EMS module;

[0010] The cabinet is also equipped with at least one load switch, one mains switch, and one bypass switch.

[0011] The load side is connected to the STS module through at least one load switch, the grid side is connected to the STS module through at least one grid switch, and the bypass switch is connected to the grid side and the load side respectively and is connected in parallel with the STS module.

[0012] As a further embodiment of this utility model: the cabinet is internally divided into at least 8 cavities, namely the first cavity to the eighth cavity;

[0013] The third cavity is used to house the battery pack;

[0014] The seventh chamber is used to house the EMS module, high-voltage box, PCS power module, and STS module;

[0015] The eighth chamber is used to house the load switch, mains switch, and bypass switch;

[0016] The sixth cavity is used to house the photovoltaic switch.

[0017] As a further embodiment of this invention: the EMS module is positioned above or below the high-voltage box module; the PCS module is positioned below the high-voltage box or below the EMS module; the STS module is positioned below or above the PCS module. The PCS module includes a first PCS module and a second PCS module.

[0018] As a further embodiment of this utility model: the cabinet has a panel on which a heat dissipation device for dissipating the heat of the battery pack to the outside of the cabinet is provided;

[0019] The cool air generated by the heat exchange device enters the fifth chamber, carrying the heat generated by the battery cells in the fifth chamber into the third chamber, and then flows into the first and fourth chambers in sequence, finally flowing back into the heat exchange device to form a cycle of heat dissipation for the battery.

[0020] As a further embodiment of this utility model: the load switch, the grid switch, and the bypass switch are controlled by a unified logic module to manage the on / off state of the load end and the grid end;

[0021] A photovoltaic switch for controlling the on / off switching of photovoltaic energy input is located in the sixth cavity.

[0022] As a further embodiment of this utility model: the outer wall surface of the cabinet near the eighth cavity is designated as the first surface, the outer wall surface near the sixth cavity is designated as the second surface, and the outer wall surface near the seventh cavity is designated as the third surface;

[0023] External cold air enters from the first and second sides, flows into the sixth and eighth cavities, then into the second cavity, and sequentially enters the STS module, PCS module, and interior, before flowing out from the third side, thus achieving heat dissipation for the STS module and PCS module.

[0024] As a further embodiment of this utility model: all the layout devices inside the second cavity, the eighth cavity, the sixth cavity, and the seventh cavity are interchanged with all the devices inside the first cavity, the third cavity, the fourth cavity, and the fifth cavity, and are not limited to being arranged on the left and right sides.

[0025] The beneficial effects of this utility model are:

[0026] 1. Highly integrated design: This utility model adopts an integrated cabinet, which integrates battery pack, PCS module, STS module and EMS module, thereby realizing the centralized arrangement of key modules.

[0027] By integrating various functional modules into the same rack, not only is installation space saved, but redundant interfaces and wiring between modules are also reduced, thereby lowering installation and maintenance costs and improving the overall reliability and compactness of the system.

[0028] 2. Real-time grid status monitoring and automatic switching: The STS module, through its connection with the grid and EMS module, enables real-time monitoring of the grid status. When the grid is de-energized, it quickly sends a status signal to the EMS module. Based on this signal, the EMS module controls the PCS module to switch from grid-connected mode to off-grid mode, allowing the battery pack to supply power to the load. When the grid is restored, the system automatically switches back to grid-connected mode.

[0029] This design effectively solves the problems of slow system response and unstable switching during power grid failures. Real-time monitoring and automatic control ensure that the load can still receive a stable power supply when the power grid is abnormal, meeting the requirements for high-reliability power supply, and is particularly suitable for occasions with high requirements for power supply continuity.

[0030] 3. System Coordinated Scheduling Capability: Through the control of the PCS module by the EMS module, the battery pack can supply power to the load when off-grid and quickly switch back to grid-connected mode when the grid is restored. This coordinated scheduling capability enables the system to maintain the continuity and stability of power supply under various operating modes.

[0031] This solution, through centralized management and scheduling, not only ensures smooth switching of the system under different states, but also leaves interfaces for future expansion to include other energy sources such as photovoltaic input, demonstrating good system scalability and application prospects.

[0032] In summary, this utility model, through its highly integrated cabinet design and the linkage control of the STS and EMS modules, successfully solves the problems existing in the installation, maintenance, and power supply switching of traditional photovoltaic energy storage systems. This achieves continuity and stability of load power supply when the grid is down, while reducing the complexity and cost of system installation, demonstrating significant technical and application advantages. Attached Figure Description

[0033] Figure 1 This is a front view schematic diagram of the layout of the optical storage and off-grid device of this utility model.

[0034] Figure 2 This is a side view of the optical storage and off-grid device of this utility model.

[0035] Figure 3 This is a schematic diagram of heat dissipation for the optical storage and off-grid device of this utility model.

[0036] Figure 4 This is another heat dissipation schematic diagram of the optical storage and off-grid device of this utility model.

[0037] Figure 5 This is a schematic diagram of the system connection of the optical storage and off-grid device of this utility model. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection method.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] like Figures 1-5 As shown, this utility model embodiment provides a photoelectric storage and off-grid device, including an integrated cabinet that internally integrates a battery pack 2, a PCS module 7, an STS module 6 and an EMS module 9.

[0041] STS module 6 is connected to the power grid and EMS module 9, and is used to detect the power grid status and send a status signal to EMS module 9 when the power grid is de-energized.

[0042] EMS module 9 is used to control PCS module 7 to switch from grid-connected mode to off-grid mode according to the status signal so that battery pack 2 can supply power to the load; it is also used to switch PCS module 7 back to grid-connected mode when the grid is restored.

[0043] In one embodiment, a photovoltaic switch 10 is also provided in the cabinet, which is connected to the PCS module 7 and whose photovoltaic energy input is controlled by the EMS module 9.

[0044] EMS module 9 is also used to control the input or distribution of photovoltaic energy based on the photovoltaic power generation connection status and the energy storage status of battery pack 2.

[0045] In one embodiment, the cabinet is further provided with a power grid terminal, a load terminal, and a high-voltage box 8; the PCS module 7 is electrically connected to the high-voltage box 8, and the high-voltage box 8 is then connected to the battery pack 2 and the EMS module 9;

[0046] The cabinet is also equipped with at least one load switch 3, one mains switch 4, and one bypass switch 5.

[0047] The load end is connected to the STS module 6 through at least one load switch 3, the grid end is connected to the STS module 6 through at least one grid switch 4, and the bypass switch 5 is connected to the grid end and the load end respectively and is connected in parallel with the STS module 6.

[0048] In one embodiment, the cabinet is internally divided into at least eight cavities, namely the first cavity 1.1 to the eighth cavity 1.8;

[0049] The third cavity 1.3 is used to house the battery pack 2;

[0050] The seventh cavity 1.7 is used to house the EMS module 9, the high-voltage box 8, the PCS power module, and the STS module 6;

[0051] The eighth chamber 1.8 is used to house the load switch 3, the mains switch 4, and the bypass switch 5;

[0052] The sixth cavity 1.6 is used to house the photovoltaic switch 10.

[0053] In one embodiment, the EMS module 9 is located above or below the high-voltage box 8 module; the PCS module 7 is located below the high-voltage box 8 or below the EMS module 9; and the STS module 6 is located below or above the PCS module 7.

[0054] In one embodiment, the cabinet has a panel on which a heat dissipation device 11 is provided for dissipating heat from the battery pack 2 to the outside of the cabinet.

[0055] The cold air generated by the heat exchange device 11 enters the fifth cavity 1.5, carrying the heat generated by the battery cells of the battery pack 2 in the fifth cavity 1.5 into the third cavity 1.3, and then flows into the first cavity 1.1 and the fourth cavity 1.4 in sequence, and finally flows back into the heat exchange device 11.

[0056] In one embodiment, the load switch 3, the grid switch 4, and the bypass switch 5 are controlled by the EMS module 9 using unified logic to manage the on / off state of the load end and the grid end.

[0057] A photovoltaic switch 10 for controlling the on / off state of photovoltaic energy input is located in the sixth cavity 1.6.

[0058] In one embodiment, the outer wall surface of the cabinet near the eighth cavity 1.8 is designated as the first surface 1.11, the outer wall surface near the sixth cavity 1.6 is designated as the second surface 1.9, and the outer wall surface near the seventh cavity 1.7 is designated as the third surface 1.10;

[0059] External cold air enters from the first surface 1.11 and the second surface 1.9, flows into the sixth cavity 1.6 and the eighth cavity 1.8, then flows into the second cavity 1.2, and sequentially enters the STS module 6, the PCS module 7 and the interior, and flows out from the third surface 1.10.

[0060] In one embodiment, all the layout devices inside the second cavity 1.2, the eighth cavity 1.8, the sixth cavity 1.6, and the seventh cavity 1.7 are interchanged with all the devices inside the first cavity 1.1, the third cavity 1.3, the fourth cavity 1.4, and the fifth cavity 1.5.

[0061] The entire grid-connected and off-grid energy storage system achieves electrical connections and communication control between its components, enabling power regulation under grid-free conditions and ensuring uninterrupted load operation. The basic logic is as follows: In off-grid mode, when the STS module 6 detects a grid power outage, it feeds back the status to the EMS module 9 and controls the STS module 6 to disconnect from the grid. Simultaneously, the first PCS module 7.1 and the second PCS module 7.2 are activated, allowing the battery to supply power to the load. In grid-connected mode, when the STS module 6 detects a grid power restoration, it feeds back the status to the EMS module 9 and controls the disconnection of the PCS module 7. Simultaneously, the STS module 6 is closed to supply power to the load. In PV (Photovoltaic) connected mode, the EMS module 9 controls when photovoltaic energy charges the battery modules or activates the PCS module 7 to supply power to the load. This achieves uninterrupted power supply to the load from multiple energy sources: batteries, photovoltaics, and the grid.

[0062] This plan:

[0063] 1. Highly integrated, all-in-one rack design

[0064] This invention achieves unified management of grid-connected and off-grid applications and photovoltaic grid connections by integrating a battery pack 2, PCS module 7, STS module 6, EMS module 9, and related switches and high-voltage boxes 8 within the same cabinet. Compared to traditional distributed cabinets or multi-device combination modes, this invention greatly reduces the space occupied by the equipment and the complexity of on-site wiring, making system installation and commissioning much simpler.

[0065] 2. Automated on-grid and off-grid switching ensures uninterrupted power supply to the load.

[0066] When a power outage is detected, the STS module 6 quickly sends a signal to the EMS module 9, which then controls the PCS module 7 to switch from grid-connected mode to off-grid mode, enabling power supply to the load from the battery pack 2 and the photovoltaic system. After the grid is restored, the system automatically switches back to grid-connected mode. This process requires no manual intervention, has a fast switching speed, and ensures the continuity of power supply to the load side.

[0067] 3. Centralized dispatch of multiple energy sources improves photovoltaic utilization.

[0068] By setting up a photovoltaic switch 10 and a high-voltage box 8, and using an EMS module 9 to uniformly schedule photovoltaic energy, grid energy, and battery energy storage:

[0069] When photovoltaic power generation is sufficient, it can be prioritized to supply loads or charge batteries, reducing dependence on the power grid;

[0070] When the grid is restored or the load demand is high, the EMS module 9 can adaptively schedule the operation of the battery and photovoltaic grid to achieve multi-energy complementarity.

[0071] 4. Optimize cabin layout and heat dissipation management to ensure system stability.

[0072] This utility model divides the cabinet interior into multiple cavities to distinguish between battery storage areas, control module areas, switch areas, and heat dissipation channels. A heat dissipation device 11 is installed on the panel to form a circulating heat dissipation path for the battery and power module. Meanwhile, the load switch 3, mains switch 4, and bypass switch 5 are centrally located in a dedicated cavity, greatly facilitating system maintenance and safety management. This cabinet design also supports flexible adjustments such as component position interchange or left-right layout.

[0073] 5. Scalability and ease of maintenance

[0074] The cabinet's interior features a modular layout including a high-voltage box 8, load switch 3, grid switch 4, and bypass switch 5, allowing for easy capacity upgrades, replacements, or maintenance. Furthermore, placing functional modules such as the photovoltaic switch 10 and load switch 3 in independent chambers reduces mutual interference and facilitates future maintenance and safety management.

[0075] In summary, this invention features a highly integrated and compartmentalized design of functional components within the cabinet, simplifying system installation and maintenance. It also enables rapid and efficient switching of power sources across various operating modes, ensuring reliable power supply to the load and significantly improving the efficiency of synergistic utilization of photovoltaics and energy storage. This achieves the goal of solving many problems in existing technologies, such as system dispersion, untimely switching, and high deployment difficulty.

[0076] In the specification and claims of this application, the terms "comprising / including" and "having / including" and variations thereof are used to specify the presence of the stated features, values, steps or components, but do not exclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0077] Some features of this invention are described in different embodiments for clarity; however, these features may also be described in combination in a single embodiment. Conversely, some features of this invention are described only in a single embodiment for brevity; however, these features may also be described individually or in any suitable combination in different embodiments.

[0078] Finally, it should be noted that any cross-referencing or superposition of the various embodiments of this solution by those skilled in the art still falls within the original disclosure scope of this solution. Furthermore, the above descriptions are merely preferred embodiments of this utility model and are not intended to limit this utility model. Although this 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A photoelectric storage and off-grid device, characterized in that, This includes an integrated cabinet that internally integrates a battery pack (2), a PCS module (7), an STS module (6), and an EMS module (9); The STS module (6) is connected to the power grid and the EMS module (9) and is used to detect the power grid status and send a status signal to the EMS module (9) when the power grid is de-energized. The EMS module (9) is used to control the PCS module (7) to switch from grid-connected mode to off-grid mode according to the status signal so that the battery pack (2) supplies power to the load; it is also used to switch the PCS module (7) back to grid-connected mode when the grid is restored.

2. The optical storage and off-grid device according to claim 1, characterized in that, The cabinet is also equipped with a photovoltaic switch (10) that is connected to the PCS module (7) and whose photovoltaic energy input is controlled by the EMS module (9). The EMS module (9) is also used to control the input or distribution of photovoltaic energy based on the photovoltaic power generation access status and the energy storage status of the battery pack (2).

3. The optical storage and off-grid device according to claim 2, characterized in that, The cabinet is also equipped with a power grid terminal, a load terminal and a high voltage box (8); the PCS module (7) is electrically connected to the high voltage box (8), and the high voltage box (8) is then connected to the battery pack (2) and the EMS module (9); The cabinet is also equipped with at least one load switch (3), one mains switch (4), and one bypass switch (5); The load end is connected to the STS module (6) through at least one load switch (3), the grid end is connected to the STS module (6) through at least one grid switch (4), and the bypass switch (5) is connected to the grid end and the load end respectively and is connected in parallel with the STS module (6).

4. The optical storage and off-grid device according to claim 3, characterized in that, The cabinet is internally divided into at least 8 chambers, namely the first chamber (1.1) to the eighth chamber (1.8). The third cavity (1.3) is used to house the battery pack (2). The seventh chamber (1.7) is used to house the EMS module (9), the high-voltage box (8), the PCS power module, and the STS module (6). The eighth cavity (1.8) is used to house the load switch (3), the mains switch (4) and the bypass switch (5); The sixth cavity (1.6) is used to house the photovoltaic switch (10).

5. The optical storage and off-grid device according to claim 4, characterized in that, The EMS module (9) is located above or below the high-voltage box (8) module; the PCS module (7) is located below the high-voltage box (8) or below the EMS module (9); the STS module (6) is located below or above the PCS module (7).

6. The optical storage and off-grid device according to claim 5, characterized in that, The cabinet has a panel on which a heat dissipation device (11) is provided to dissipate the heat of the battery pack (2) to the outside of the cabinet. The cold air generated by the heat exchange device (11) enters the fifth cavity (1.5), carrying the heat generated by the battery cells of the battery pack (2) in the fifth cavity (1.5) into the third cavity (1.3), and then flows into the first cavity (1.1) and the fourth cavity (1.4) in sequence, and finally flows back into the heat exchange device (11).

7. The optical storage and off-grid device according to claim 6, characterized in that, The load switch (3), the grid switch (4) and the bypass switch (5) are controlled by the EMS module (9) in a unified logic to manage the on / off state of the load end and the grid end; A photovoltaic switch (10) for controlling the on / off state of photovoltaic energy input is located in the sixth cavity (1.6).

8. The optical storage and off-grid device according to claim 7, characterized in that, The outer wall surface of the cabinet near the eighth cavity (1.8) is designated as the first surface (1.11), the outer wall surface near the sixth cavity (1.6) is designated as the second surface (1.9), and the outer wall surface near the seventh cavity (1.7) is designated as the third surface (1.10). External cold air enters from the first side (1.11) and the second side (1.9), flows into the sixth cavity (1.6) and the eighth cavity (1.8), then flows into the second cavity (1.2), and enters the STS module (6), PCS module (7) and the interior in sequence, and flows out from the third side (1.10).

9. The optical storage and off-grid device according to claim 8, characterized in that, All the layout devices inside the second cavity (1.2), the eighth cavity (1.8), the sixth cavity (1.6), and the seventh cavity (1.7) are interchanged with all the devices inside the first cavity (1.1), the third cavity (1.3), the fourth cavity (1.4), and the fifth cavity (1.5).

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