Energy storage system

Abstract

The utility model provides an energy storage system, which belongs to the technical field of industrial and commercial energy storage, and comprises a cabinet body, the cabinet body comprises at least two frame body modules, the frame body modules are sequentially stacked, two adjacent frame body modules are detachably connected, and each frame body module is provided with an accommodating cavity; the function modules are arranged to be one or more of a static change-over switch, a maximum power point tracker and an energy storage converter, the number of the function modules is the same as that of the containing cavities, the function modules and the containing cavities are arranged in a one-to-one correspondence mode, and the function modules are installed in the containing cavities. The energy storage system has the beneficial effects that each functional module of the energy storage system is independently mounted in the corresponding frame body module, and the frame body modules can be spliced or detached, so that the functional modules in the energy storage system can be freely combined, and the flexibility of the energy storage system is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of industrial and commercial energy storage technology, and relates to an energy storage system. Background Technology

[0002] In commercial and industrial energy storage systems, integrated energy storage units typically combine a Static Transfer Switch (STS), a Power Conversion System (PCS), and a Maximum Power Point Tracker (MPPT). These components are integrated into a fixed cabinet, forming a highly integrated energy storage system. However, the fixed cabinet design introduces certain limitations, especially when the energy storage system needs to be expanded or adjusted according to actual needs, making it less flexible.

[0003] In traditional integrated cabinets, the number of input / output interfaces of the STS, the DC-side terminal capacity of the PCS, and the photovoltaic string access channels of the MPPT are all set based on initial requirements. If an additional STS / PCS / MPPT device is needed, due to the limitations of the cabinet's physical space and electrical structure, it is impossible to directly expand or insert a new STS device. Usually, an additional cabinet or external power distribution unit needs to be deployed, resulting in wasted installation space and increased costs.

[0004] From a manufacturing perspective, different customer scenarios have significantly different configuration requirements for STS, PCS, and MPPT. This necessitates manufacturers customizing cabinets of specific specifications for each project and installing these components within them. However, this design has a low degree of modularity, making the installation process complex and limiting the flexibility of expanding or disassembling STS, PCS, and MPPT devices in practical applications. These limitations significantly reduce the flexibility of energy storage systems, making it difficult to adapt to diverse customer needs and rapidly changing market environments. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an energy storage system.

[0006] The objective of this utility model can be achieved through the following technical solution: an energy storage system, comprising:

[0007] The cabinet includes at least two frame modules, which are stacked sequentially and adjacent frame modules are detachably connected. Each frame module is provided with a receiving cavity.

[0008] The functional modules are configured as one or more of static transfer switches, maximum power point trackers, and energy storage converters. The number of functional modules is the same as the number of housing cavities and they are configured in a one-to-one correspondence. The functional modules are installed inside the housing cavities.

[0009] Preferably, at least one of the functional modules is configured as the energy storage converter.

[0010] Preferably, the number of static transfer switches is at least one, and the number of energy storage converters is at least two, with at least two energy storage converters connected in parallel through one of the static transfer switches.

[0011] Preferably, the number of static transfer switches is at least two, and the static transfer switches are connected in parallel. The number of energy storage converters is at least two, and the energy storage converters are divided into several parallel clusters. Each parallel cluster includes at least one energy storage converter. The number of each parallel cluster is the same as the number of each static transfer switch and is set in a one-to-one correspondence. Each energy storage converter in each parallel cluster is electrically connected to the corresponding static transfer switch.

[0012] Preferably, the number of the static transfer switch, the maximum power point tracker, and the energy storage converter is at least one, the maximum power point tracker is electrically connected to the energy storage converter, and the energy storage converter is electrically connected to the static transfer switch.

[0013] Preferably, the frame module is provided with two support slides, the two support slides are respectively located in the receiving cavity, and the bottom sides of the functional module are provided on the support slides.

[0014] Preferably, the functional module is provided with two side panels, which are located on both sides of the front of the functional module, and are fixedly connected to the frame module by locking screws; handles are provided on the side panels or the front of the functional module.

[0015] Preferably, one of the top and bottom of the frame module is provided with a plug slot and the other is provided with a plug connector, and the plug slot and the plug connector can form a complementary plug-in structure.

[0016] Preferably, in two adjacent frame modules, the connector of one is inserted into the connector slot of the other, and the two are fixedly connected by connecting screws; the connector slot and the connector are provided at each of the four corners of the frame module.

[0017] Preferably, in the frame module that houses the static changeover switch, a pass coil is formed on its top and side walls, and the pass coil has a detachable or removable sealing surface.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. Each functional module of this energy storage system is installed separately in its corresponding frame module, and the frame modules can be spliced ​​or disassembled, thereby allowing the functional modules of the energy storage system to be freely combined, which greatly improves the flexibility of the energy storage system.

[0020] 2. Since each static transfer switch (STS) typically has only 5 interfaces and can only connect a maximum of 5 energy storage converters (PCS), in this energy storage system, if there are a total of 15 PCS, then 3 STSs need to be configured. This design not only eliminates the limitation on the number of interfaces, but also makes the configuration of functional modules more flexible and reasonable, while improving the scalability and management efficiency of the system.

[0021] 3. Energy can be mutually dispatched between different static transfer switches (STS). For example, STS A connects to 5 power storage converters (PCS) and is directly connected to the load; while STS B also connects to 5 PCS. When the battery in PCS A is depleted, STS A can dispatch energy from the PCS connected to STS B, thus achieving cross-STS energy allocation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the energy storage system of this utility model.

[0023] Figure 2 This is a schematic diagram of the cabinet structure of this utility model.

[0024] Figure 3 This is an exploded view of the structure of the two frame modules of this utility model.

[0025] Figure 4 This is a structural schematic diagram of the frame module of this utility model.

[0026] Figure 5 This is a schematic diagram of the wiring of a single static changeover switch of this utility model through the top coil.

[0027] Figure 6 This is a schematic diagram of the static transfer switch of this utility model in horizontal parallel operation.

[0028] Figure 7 This is a schematic diagram of the static transfer switch of this utility model stacked in parallel.

[0029] In the diagram, 100 is the frame module; 110 is the receiving cavity; 120 is the support slide; 130 is the plug slot; 140 is the plug connector; 150 is the through coil; 151 is the closed surface; 160 is the connecting screw; 200 is the cabinet; 310 is the side panel; 320 is the handle; 330 is the locking screw; 340 is the static transfer switch; 350 is the maximum power point tracker; and 360 is the energy storage converter. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figures 1 to 4 As shown, an energy storage system includes: a cabinet 200, the cabinet 200 including at least two frame modules 100, the frame modules 100 being stacked sequentially and adjacent frame modules 100 being detachably connected, and each frame module 100 being provided with a receiving cavity 110; and functional modules 300, the functional modules 300 being configured as one or more of a static transfer switch 340, a maximum power point tracker 350, and an energy storage converter 360, the number of functional modules 300 being the same as the number of receiving cavities 110 and being arranged in a one-to-one correspondence, and the functional modules 300 being installed inside the receiving cavities 110.

[0032] The cabinet 200 is assembled from multiple frame modules 100, each frame module 100 being equipped with a receiving cavity 110 for housing the functional modules 300. In the actual structure, the functional modules 300 can be pre-assembled within the frame modules 100. By assembling multiple frame modules 100 together, the desired energy storage system configuration can be obtained, which is very convenient. Adjacent frame modules 100 are detachably connected, meaning that functional modules 300 can be easily added or removed according to actual needs, thus allowing for flexible combinations of various functional modules 300.

[0033] Functional module 300 is a core component of this energy storage system, including, but not limited to, a static transfer switch 340 (STS), a maximum power point tracker 350 (MPPT), and a storage converter 360 (PCS). The static transfer switch 340 (STS) provides fast, seamless switching between two power sources, ensuring continuous power supply to the load. The maximum power point tracker 350 (MPPT) adjusts the input voltage in real time to find the maximum power point of the photovoltaic panel, thereby improving the energy harvesting efficiency of the entire system. The storage converter 360 (PCS) is one of the core devices in the energy storage system, primarily used for bidirectional energy conversion and regulation. Its core function is to connect the energy storage battery (or photovoltaic panel) to the grid / load, ensuring efficient and stable energy conversion between direct current (DC) and alternating current (AC), thus supporting the charging and discharging control and energy management of the energy storage system.

[0034] This solution utilizes a modularly designed frame module 100 to enable the free combination and flexible configuration of key functional modules 300 (such as static transfer switches 340STS, maximum power point trackers 350MPPT, and energy storage converters 360PCS) in the energy storage system. Each frame module 100 can precisely accommodate specific functional modules 300, and rapid assembly is achieved through a complementary plug-in structure to form an energy storage system.

[0035] Example 1:

[0036] In each of the functional modules 300, at least one functional module 300 is configured as an energy storage converter 360.

[0037] Each energy storage system requires at least one energy storage converter 360 (PCS). This means that the PCS is an essential component regardless of the other configurations of the system.

[0038] The static transfer switch 340 (STS) and maximum power point tracker 350 (MPPT) are optional components. The system can operate without these two components. Specifically, if the energy storage system is used in conjunction with an energy storage power cabinet that is already configured with an MPPT and an STS, all functional modules 300 in this system can be configured as energy storage converters 360 (PCS). This is because the energy storage power cabinet already includes the functions of handling energy input optimization (via MPPT) and power switching (via STS), so these functions do not need to be repeated in this combination.

[0039] Example 2:

[0040] The number of static transfer switches 340 is at least one, and the number of energy storage converters 360 is at least two, with at least two energy storage converters 360 connected in parallel through a static transfer switch 340.

[0041] When there are two energy storage converters 360 (PCS) in the system, the two PCS need to be connected in parallel through a static transfer switch 340 (STS) so that the total output power of the energy storage system can be adjusted as needed.

[0042] For example, by connecting multiple 100kW PCS units in parallel, the energy storage system can be easily expanded to a total power output of 500kW. Furthermore, a single 500kW STS can support up to five PCS units, meeting high-power demand scenarios. Power output can be increased or decreased by adding or removing PCS units.

[0043] Example 3:

[0044] There are at least two static transfer switches 340, which are connected in parallel. There are at least two energy storage converters 360, which are divided into several parallel clusters. Each parallel cluster includes at least one energy storage converter 360. The number of each parallel cluster is the same as the number of each static transfer switch 340 and they are set in a one-to-one correspondence. Each energy storage converter 360 in the parallel cluster is electrically connected to the corresponding static transfer switch 340.

[0045] All energy storage converters 360 (PCS) are divided into several parallel clusters. Each cluster consists of one or more PCS, and the number of parallel clusters must be equal to the number of static transfer switches 340 (STS). Each parallel cluster corresponds to and is directly connected to a specific STS. For example, if there are two STSs, there will be two parallel PCS clusters, with each PCS in the parallel cluster connected to one STS, thus achieving parallel operation of the PCS within that cluster. This configuration allows the STS to effectively manage and control its assigned PCS cluster, including power distribution, load balancing, and rapid switching operations when necessary, ensuring stable system operation.

[0046] It should be further explained that since each static transfer switch 340 (STS) typically has only 5 interfaces and can only connect a maximum of 5 energy storage converters 360 (PCS), in this energy storage system, if there are a total of 15 PCS, then 3 STSs need to be configured. This design not only eliminates the limitation on the number of interfaces, but also makes the configuration of functional modules 300 more flexible and reasonable, while improving the scalability and management efficiency of the system.

[0047] In Embodiment 3, energy can be mutually dispatched between different static transfer switches 340 (STS). For example, STS A is connected to 5 energy storage converters 360 (PCS) and directly connected to the load; while STS B is also connected to 5 PCS. When the PCS battery on side A is depleted, STS A can dispatch the energy of the PCS battery connected to STS B, thereby achieving cross-STS energy allocation. This design not only breaks through the capacity limitation of a single STS, but also theoretically supports system expansion of more than 500kW, significantly improving the flexibility and overall performance of the energy storage system.

[0048] Example 4:

[0049] The number of static transfer switch 340, maximum power point tracker 350 and energy storage converter 360 is at least one. Maximum power point tracker 350 is electrically connected to energy storage converter 360 and energy storage converter 360 is electrically connected to static transfer switch 340.

[0050] like Figure 2 , Figure 3 , Figure 4 As shown, based on the above implementation method, the frame module 100 is provided with two support slides 120, the two support slides 120 are respectively located in the receiving cavity 110, and the bottom sides of the functional module 300 are provided on the support slides 120.

[0051] The slide rails provide physical support for the functional module 300. The two support slide rails 120 are located within the receiving cavity 110, specifically at the bottom of both sides of the functional module 300. This layout ensures that the functional module 300 can be placed stably on the slide rails and slide smoothly along the slide rails throughout the installation or removal process.

[0052] Based on the above implementation method, the functional module 300 is provided with two side baffles 310. The two side baffles 310 are located on both sides of the front of the functional module 300, and the two side baffles 310 are fixedly connected to the frame module 100 by locking screws 330.

[0053] The side panel 310 is fixedly connected to the frame module 100 by locking screws 330. This means that during installation, the functional module 300 can be firmly fixed inside the frame module 100 by tightening the screws, thereby fixing the functional module 300 and the frame module 100 together to form a whole.

[0054] Based on the above-described embodiments, a handle 320 is provided on the front of the side panel 310 or the functional module 300. The presence of the handle 320 greatly facilitates the extraction and insertion process of the functional module 300. Workers can easily push the functional module 300 into or pull it out of the frame module 100 along the support slide 120 by holding the handle 320.

[0055] like Figure 3 , Figure 4 As shown, based on the above embodiment, one of the top and bottom of the frame module 100 is provided with a plug groove 130 and the other is provided with a plug connector 140. The plug groove 130 and the plug connector 140 can form a complementary plug-in structure.

[0056] This design, through the tight fit between the groove (plug slot 130) and the protrusion (plug connector 140), ensures a quick and stable connection between the frame modules 100, while also providing good alignment accuracy and anti-slip performance. The plug connector 140 is typically designed with a guide taper or rounded corners to facilitate insertion into the plug slot 130.

[0057] In the actual structure, one frame module 100 can be connected to another frame module 100 via its bottom connector 140 or connector slot 130, which in turn connects to the top connector slot 130 or connector 140. This allows the frame modules 100 to be stacked vertically layer by layer to form a multi-layer structure. During installation, simply align the connector 140 of the upper module with the connector slot 130 of the lower module and gently insert it to complete the initial connection. The entire process requires no complicated tools and is simple and efficient.

[0058] Based on the above implementation, in two adjacent frame modules 100, the connector 140 of one is inserted into the connector slot 130 of the other, and the two are fixedly connected by connecting screws 160.

[0059] Although the plug-in structure itself provides a basic mechanical connection, it cannot provide vertical locking. Therefore, screws are needed to fix the first and second connecting parts together, so that the two frame modules 100 are completely fixed together.

[0060] Based on the above implementation method, the frame module 100 is provided with a plug slot 130 and a plug connector 140 at each of the four corners.

[0061] By increasing the number of slots 130 and connectors 140, a more robust physical connection can be achieved. Each connection point shares a portion of the load, making the overall structure more stable, reducing the risk of system failure due to the failure of a single connection point, and multiple sets of slots 130 and connectors 140 help to distribute the stress applied to the connection more evenly.

[0062] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, based on the above embodiment, the frame module 100, which internally houses the static changeover switch 340, has a pass-through coil 150 on its top and side walls, and the pass-through coil 150 has a detachable or removable closed surface 151.

[0063] The enclosed surface 151 within the coil 150 can be removed or dismantled as needed, thereby exposing the wire passage holes. These wire passage holes provide a channel for the cable, allowing it to pass smoothly into the receiving cavity 110 and connect directly to the terminals (such as copper busbars) on the static transfer switch 340 (STS).

[0064] like Figure 5 As shown, each pass-through coil 150 on the top wall surface forms a pass-through hole after the closing surface 151 is removed, allowing the cable to pass vertically downwards from the top and connect to a single STS. This layout is particularly suitable for scenarios that only require one STS, simplifying the wiring process and maintaining the cleanliness of the system.

[0065] like Figure 2 , Figure 6 As shown, the various cable guides 150 on the sidewalls provide wiring paths when multiple STSs are stacked and operated in parallel. The cable guide holes created after removing the enclosure 151 allow cables to pass through the side of the bracket module into the receiving cavity 110 and then connect to the corresponding STS terminals. This approach is ideal for configurations requiring multiple STSs to work together, supports modular splicing and expansion, ensures that each STS can be easily connected to the required cables, and maintains the structural stability and clear, orderly wiring of the entire system.

[0066] like Figure 2 , Figure 7 As shown, by incorporating coils 150 on the top and side walls and equipping them with removable or detachable enclosures 151, the system can adapt to different wiring requirements, easily accommodating both top and side entry points, greatly improving wiring flexibility. This design provides a solid structural foundation for the modular splicing of STSs, allowing multiple STSs to be easily stacked and connected in parallel to meet application scenarios with different power requirements. When not in use, the enclosures 151 effectively prevent dust, moisture, and other contaminants from entering the frame module 100, protecting the internal components from the influence of the external environment.

[0067] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0068] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0070] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An energy storage system, characterized by, The utility model relates to a cabinet body (200) comprising at least two rack modules (100), each of the rack modules (100) is sequentially stacked, and two adjacent rack modules (100) are detachably connected, each of the rack modules (100) is provided with a containing cavity (110). The utility model relates to a cabinet body (200) comprising at least two rack modules (100), each of the rack modules (100) is sequentially stacked, and two adjacent rack modules (100) are detachably connected, each of the rack modules (100) is provided with a containing cavity (110). At least one of the functional modules is the energy storage converter (360).

2. An energy storage system as claimed in claim 1, characterized in that: The number of static transfer switches (340) is at least one, and the number of energy storage converters (360) is at least two, and at least two energy storage converters (360) can be connected in parallel through a static transfer switch (340).

3. An energy storage system as claimed in claim 2, characterized in that: The number of static transfer switches (340) is at least two, each of the static transfer switches (340) is connected in parallel, the number of energy storage converters (360) is at least two, each of the energy storage converters (360) is divided into a plurality of parallel clusters, the parallel cluster comprises at least one energy storage converter (360), the number of each of the parallel clusters is the same as and one-to-one corresponds to the number of each of the static transfer switches (340), and each of the energy storage converters (360) in the parallel cluster is electrically connected to the corresponding static transfer switch (340).

4. An energy storage system as claimed in claim 1 or 2 or 3, characterized in that: The number of static transfer switches (340), maximum power point trackers (350), and energy storage converters (360) is at least one, the maximum power point tracker (350) is electrically connected to the energy storage converter (360), and the energy storage converter (360) is electrically connected to the static transfer switch (340).

5. An energy storage system as claimed in claim 1, characterized in that: The rack module (100) is provided with two support slides (120), and the two support slides (120) are located in the containing cavities (110), respectively.

6. An energy storage system as claimed in claim 1 or 2 or 3 or 5, characterized in that: The functional module is provided with two side baffles (310), and the two side baffles (310) are located on the front sides of the functional module, respectively.

7. An energy storage system as claimed in claim 1 or 2 or 3 or 5, characterized in that: One of the top and bottom of the rack module (100) is provided with a plug-in slot (130), and the other is provided with a plug-in head (140), and the plug-in slot (130) can form a complementary plug-in structure with the plug-in head (140).

8. An energy storage system as claimed in claim 1 or 2 or 3 or 5, characterized in that: ​ 9. An energy storage system as claimed in claim 8, characterised in that: The plug-in head (140) of one of the two adjacent shelf body modules (100) is inserted into the plug-in slot (130) of the other, and the two are fixedly connected by a connecting screw (160); the plug-in slot (130) and the plug-in head (140) are arranged at four corner positions of the shelf body module (100).

10. An energy storage system as claimed in claim 3, characterized in that: The top wall surface and the two side wall surfaces of the shelf body module (100) in which the static transfer switch (340) is accommodated are each provided with a wire passing hole (150), and the wire passing hole (150) has a detachable or breakable closing surface (151).

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