Energy storage power distribution cabinet and energy storage system

Abstract

The energy storage power distribution cabinet comprises an input terminal and an output terminal; a first circuit breaker is electrically connected to the input terminal and the output terminal; an electric energy detection module is connected in parallel with the first circuit breaker; a load power supply module is electrically connected to the output terminal; and a first fuse is electrically connected to the input terminal and the first circuit breaker.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage system technology, and in particular to an energy storage distribution cabinet and an energy storage system. Background Technology

[0002] In the field of energy storage technology, energy storage distribution cabinets serve as end-point loads in the distribution network. Miniature circuit breakers are typically chosen to protect these cabinets. As the capacity of energy storage power stations gradually increases, the number of energy storage distribution cabinets also rises, leading to a greater demand for transformer capacity in large-scale energy storage power stations.

[0003] In related technologies, circuit breaker faults in large-scale energy storage power stations can provide fault currents of up to tens of kiloamperes. However, miniature circuit breakers have low short-circuit breaking capacity, resulting in poor short-circuit withstand capability of energy storage distribution cabinets. Utility Model Content

[0004] This disclosure provides an energy storage distribution cabinet and an energy storage system, which at least to some extent overcomes the problem of poor short-circuit withstand capability of energy storage distribution cabinets in related technologies.

[0005] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0006] According to one aspect of this disclosure, an energy storage distribution cabinet is provided, comprising: Input terminals are used to input AC signals; Output terminals are used to output AC signals; A first circuit breaker, which is electrically connected to the input terminal and the output terminal; The power detection module is connected in parallel with the first circuit breaker; A load power supply module, wherein the load power supply module is electrically connected to the output terminal; It also includes: a first fuse, which is electrically connected to the input terminal and the first circuit breaker.

[0007] In one embodiment of this disclosure, the first fuse includes a current-limiting fuse.

[0008] In one embodiment of this disclosure, the first circuit breaker includes a miniature circuit breaker or a molded case circuit breaker.

[0009] In one embodiment of this disclosure, the power detection module includes a current transformer, an AC power meter, and a second fuse. The current transformer is electrically connected to the first fuse and the first circuit breaker. The current transformer is electrically connected to one end of the AC power meter, and the other end of the AC power meter is electrically connected to the output terminal through the second fuse.

[0010] In one embodiment of this disclosure, the load power module includes at least one first load branch, each first load branch including a first miniature circuit breaker and a first load power supply, the first load power supply being electrically connected to the output terminal through the first miniature circuit breaker.

[0011] In one embodiment of this disclosure, the load power module further includes at least one second load branch, each second load branch including a second miniature circuit breaker, a transformer and a load power submodule, one end of the transformer being electrically connected to the output terminal through the second miniature circuit breaker, and the other end of the transformer being electrically connected to the load power submodule.

[0012] In one embodiment of this disclosure, the load power supply submodule includes at least one first load sub-branch, each first load sub-branch including a third miniature circuit breaker and a second load power supply, the second load power supply being electrically connected to the other end of the transformer through the third miniature circuit breaker.

[0013] In one embodiment of this disclosure, the load power supply submodule further includes a second load subbranch, which includes a backup power supply, an uninterruptible power supply (UPS), and at least one third load subbranch. The backup power supply is electrically connected to the UPS, and at least one third load subbranch is electrically connected to the other end of the transformer via the UPS. Each third load subbranch includes a fourth miniature circuit breaker and a third load power supply, and the third load power supply is electrically connected to the UPS via the fourth miniature circuit breaker.

[0014] In one embodiment of this disclosure, the energy storage distribution cabinet further includes a surge protector, one end of which is electrically connected to the output terminal, and the other end of which is grounded.

[0015] According to another aspect of this disclosure, an energy storage system is provided, including at least one energy storage distribution cabinet as described above.

[0016] In this embodiment of the disclosure, the first fuse enables the power distribution circuit formed in the energy storage distribution cabinet to cut off the fault current within the short-circuit withstand range, which not only ensures the reliable disconnection of the miniature circuit breaker in the load power module and protects the load power in the load power module, but also improves the short-circuit withstand capability of the energy storage distribution cabinet to the outside world.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 This diagram illustrates the structure of an energy storage system provided in an embodiment of the present disclosure.

[0020] Figure 2 This diagram illustrates the structure of an energy storage distribution cabinet provided in an embodiment of the present disclosure.

[0021] Figure 3 This diagram illustrates the structure of another energy storage distribution cabinet provided in an embodiment of the present disclosure.

[0022] Figure 4 This diagram illustrates the structure of another energy storage distribution cabinet provided in an embodiment of the present disclosure.

[0023] Figure 5 A schematic diagram of another energy storage distribution cabinet provided in an embodiment of this disclosure is shown.

[0024] Figure 6 The cutoff curve of the first fuse provided in the embodiments of this disclosure is shown.

[0025] Figure 7 This diagram illustrates the structure of an energy storage system provided in an embodiment of the present disclosure.

[0026] The reference numerals in the attached figures are explained as follows: 100. Energy storage system; 110. Energy storage device; 120. High-voltage cable; 130. First power conversion device; 140. Second power conversion device; 200. Energy storage distribution cabinet; 210. Input terminal; 220. Output terminal; 230. First circuit breaker; 240. Power detection module; 241. Current transformer; 242. AC power meter; 243. Second fuse; 250. Load power supply module; 251. First load branch; 2511. First miniature circuit breaker; 2512. First load power supply; 252. Second load branch; 2521. Second miniature circuit breaker; 2522. Transformer; 2523. Load power supply submodule; 2524. First load sub-branch; 25241. Third miniature circuit breaker; 25242. Second load power supply; 2525. Second load sub-branch; 25251. Backup power supply; 25252. Uninterruptible power supply; 25253. Fourth miniature circuit breaker; 25254. Third load power supply; 260. First fuse; 270. Surge protector. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0029] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0030] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0031] Taking electrochemical energy storage as an example, this solution provides an energy storage device 110, which is applied to the energy storage system 100. The energy storage device 110 is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0032] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices 110 include: (1) Large-scale energy storage power stations (including multiple prefabricated energy storage modules) applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the renewable energy absorption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation. (2) The energy storage prefabricated cabin applied on the grid side mainly functions as peak regulation, frequency regulation and grid congestion relief. In terms of peak regulation, it can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption. (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0033] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 according to an embodiment of this application. Figure 1 And this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device in this application is not limited to a prefabricated energy storage module in a generation / distribution point energy storage scenario.

[0034] This application provides an energy storage system 100, which includes: a high-voltage cable 120, a first power conversion device 130, a second power conversion device 140, and an energy storage device 110 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 140 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device through grid connection. The energy storage device is connected to the high-voltage cable 120 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and ensuring stable grid operation; or, the wind power conversion device... The device is always connected to the high-voltage cable 120. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 110 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 110 together with the high-voltage cable 120 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0035] In some embodiments on the distribution network side, the first power conversion device 130 can be a photovoltaic panel, and the energy storage device 110 is connected to the high-voltage cable 120 and installed downstream of the high-voltage cable 120 between the user load and the user load. The electrical energy output by the photovoltaic panel is stored in the energy storage device 110, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 120 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0036] Optionally, the first power conversion device 130 may include, but is not limited to, a photovoltaic panel, and the second power conversion device 140 may include, but is not limited to, a wind power conversion device. The first power conversion device 130 and the second power conversion device 140 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0037] Optionally, the energy storage device 110 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0038] Optionally, the energy storage device 110 may include battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of individual batteries. The actual application form of the energy storage device 110 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 110.

[0039] Alternatively, the single cell is not limited to at least one of cylindrical, square, prismatic, or other shaped cells.

[0040] Optionally, the single cell can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. The single cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0041] As the capacity of energy storage power stations gradually increases, the number of energy storage distribution cabinets also increases, leading to a greater demand for auxiliary power supply capacity and consequently, an increase in the transformer capacity required for energy storage power stations.

[0042] If a short-circuit fault occurs in the energy storage distribution cabinet, the short-circuit capacity on the high-voltage side of the distribution network is considered to be ∞, and the expected short-circuit current can be expressed as: (Formula 1) in, For transformer capacity; Transformer impedance; This is the rated voltage on the low-voltage side; This is the rated current on the low-voltage side; This is the short-circuit current.

[0043] As can be seen from Formula 1, the magnitude of the expected short-circuit current is affected by the capacity of the transformer required for the energy storage power station, and The larger, The smaller.

[0044] In related technologies, large-scale energy storage power stations require large-capacity transformers, and circuit blockage faults can lead to fault currents of up to tens of kiloamperes. Miniature circuit breakers have low short-circuit breaking capacity, resulting in low short-circuit current withstand capability at the energy storage distribution cabinet or energy storage system end; for example, the Short-Circuit Current Rating (SCCR) is typically less than or equal to 10kA. The demand for large-scale energy storage power stations does not match their capacity, severely limiting the selection of transformers in user power distribution schemes.

[0045] To at least partially solve the above-mentioned technical problems, this disclosure provides an energy storage distribution cabinet and an energy storage system. The energy storage distribution cabinet includes input terminals, output terminals, a first circuit breaker, a load power module, and a first fuse. The first circuit breaker is electrically connected to the input terminals and the output terminals. The power detection module is connected in parallel with the first circuit breaker. The load power module is electrically connected to the output terminals. The first fuse is electrically connected to the input terminals and the first circuit breaker. Through the first fuse, the power distribution circuit formed in the energy storage distribution cabinet can cut off the fault current within the short-circuit withstand range, which not only ensures the reliable disconnection of the miniature circuit breaker in the load power module and protects the load power in the load power module, but also improves the short-circuit withstand capability of the energy storage distribution cabinet.

[0046] It should be noted that, where there is no conflict, the embodiments of this utility model and the technical features thereof can be combined with each other.

[0047] The exemplary implementation method of this invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] Figure 2 This diagram illustrates the structure of an energy storage distribution cabinet 200 provided in an embodiment of this disclosure. Figure 2 As shown, the energy storage distribution cabinet 200 provided in this embodiment includes: Input terminal 210 is used for inputting AC signals; Output terminal 220 is used to output AC signals; The first circuit breaker 230 is electrically connected to the input terminal 210 and the output terminal 220. The power detection module 240 is connected in parallel with the first circuit breaker 230; The load power module 250 is electrically connected to the output terminal 220. The first fuse 260 is electrically connected to the input terminal 210 and the first circuit breaker 230.

[0049] Input terminal 210 serves as the power input point for AC signals. It is electrically connected to the AC bus, receives power from the AC bus, and stably transmits the AC signal to the components inside the energy storage distribution cabinet 200. For example, input terminal 210 can be electrically connected to a 240V, 360V, or 480V three-phase five-wire AC power supply. It should be noted that, depending on the input AC signal, input terminal 210 must possess certain AC carrying capacity and voltage level adaptability.

[0050] In one embodiment, the input terminal 210 may be bolt-fitted to ensure secure wiring and reduce contact resistance.

[0051] Output terminal 220 serves as the power outlet, used to output AC signals. It accurately transmits the AC signals processed by the energy storage distribution cabinet 200 to the load power module 250, determining the power supply stability of the load power module 250. It should be noted that, considering the rated current, short-time overload current, and rated voltage of the load power module 250, output terminal 220 must possess certain AC carrying capacity and voltage level adaptability.

[0052] In one embodiment, the output terminal 220 can be bolt-fitted, pluggable, or connected via a terminal block to start and stop the load power module 250 at high frequency, in order to prevent the output terminal 220 from becoming loose.

[0053] The first circuit breaker 230 is a safety switch in the power distribution circuit of the energy storage distribution cabinet 200. It has the functions of normal on / off control and fault protection disconnection, thereby ensuring the safety of the energy storage distribution cabinet 200 and upstream and downstream equipment.

[0054] When the energy storage distribution cabinet 200 starts up, stops up, or switches operating conditions (e.g., switching the charging and discharging modes of the energy storage battery pack or starting and stopping the load power supply), the first circuit breaker 230 can be manually or automatically controlled to connect or disconnect the power supply circuit, thereby achieving precise control of AC signal transmission and ensuring the normal operation of the energy storage distribution cabinet 200.

[0055] When a fault occurs in the power distribution circuit, such as overcurrent (e.g., short circuit, overload), overvoltage (e.g., power grid fluctuation, abnormal discharge of load power supply), or undervoltage (e.g., sudden drop in the power of the input AC signal), the first circuit breaker 230 can disconnect the power distribution circuit, cut off the fault current, and prevent the fault from spreading and causing accidents such as overheating of the input terminal 210 or burning of the wires.

[0056] It should be noted that the selection and parameters of the first circuit breaker 230 need to take into account the synergistic effect of the input terminal 210 and the output terminal 220.

[0057] The power detection module 240 is used to monitor the power data in the energy storage distribution cabinet 200. For example, the power detection device collects, analyzes, and provides feedback on key electrical parameters of the distribution circuit in real time, providing data support for the safe operation, energy efficiency management, and fault diagnosis of the energy storage distribution cabinet 200. The power data collected by the power detection module 240 includes, but is not limited to, parameters such as voltage, current, power, and energy at the input terminals 210 and output terminals 220.

[0058] In this disclosure, the power detection module 240 is used to detect the power in the power distribution circuit, and the power detection module 240 is connected in parallel with the first circuit breaker 230. It should be noted that the connection position of the power detection module 240 in the power distribution circuit may vary depending on its function.

[0059] The load power module 250 is electrically connected to the output terminal 220. The load power module 250 converts the AC signal received from the output terminal 220 into the power required by the downstream load, thereby ensuring the reliability and safety of the power supply. The load power module 250 can convert different voltage and current types according to the power requirements of the downstream load. For example, it can convert the AC signal input from the AC bus (e.g., AC 240V) into stable DC power (e.g., DC 24V), ensuring that the downstream load receives power that meets its rated parameters.

[0060] The first fuse 260 is electrically connected to the input terminal 210 and the first circuit breaker 230, meaning that the first fuse 260 is electrically connected in the power distribution circuit between the input terminal 210 and the first circuit breaker 230, and is an overcurrent protection device for the energy storage distribution cabinet 200. The first fuse 260 is used to disconnect the power distribution circuit when an abnormal overload or short circuit occurs, so as to ensure the safety of the equipment in the energy storage distribution cabinet 200 and the downstream load, and prevent damage to the equipment in the energy storage distribution cabinet 200 due to excessive current.

[0061] When a short circuit fault occurs in the power distribution circuit, the resistance at the short circuit point approaches 0, and a short circuit current that is several times or even tens of times greater than the normal operating current is generated instantaneously. The fuse in the first fuse 260 generates heat and melts, thereby cutting off the power distribution circuit and improving the safety of the energy storage distribution cabinet 200.

[0062] When the downstream load is in overload operation for a long time, the current in the power distribution circuit is continuously higher than the normal operating current, but has not yet reached the amplitude of the short circuit current. The fuse in the first circuit breaker generates heat and melts, thereby cutting off the power distribution circuit.

[0063] In this embodiment of the disclosure, the first fuse 260 enables the power distribution circuit to cut off the fault current within the short-circuit withstand range, which not only ensures the reliable disconnection of the miniature circuit breaker in the load power module 250 and protects the load power in the load power module 250, but also improves the short-circuit withstand capability of the energy storage distribution cabinet 200.

[0064] In one embodiment, the first fuse 260 is a current-limiting fuse. When the current in the power distribution circuit is overloaded or short-circuited, and the current value in the power distribution circuit exceeds the rated current of the current-limiting fuse, the fuse wire inside the current-limiting fuse is heated and melts, thereby cutting off the power distribution circuit to protect the circuit or equipment in the energy storage distribution cabinet 200.

[0065] In one embodiment, the first circuit breaker 230 includes a miniature circuit breaker or a molded case circuit breaker.

[0066] The breaking capacity of the molded case circuit breaker can reach 50kA. If a fault current of up to 50kA is input to the input terminal 210, it can be effectively interrupted by the molded case circuit breaker. The standard signal molded case circuit breaker has no current limiting function, or the molded case circuit breaker with current limiting function can only limit the current limiting function to tens of thousands of amperes. By connecting the first fuse 260 in series with the molded case circuit breaker in the power distribution circuit, the short circuit withstand capability of the energy storage distribution cabinet 200 can be improved.

[0067] Miniature circuit breakers have a lower breaking capacity than molded case circuit breakers. By connecting the first fuse 260 in series with the miniature circuit breaker in the power distribution circuit, the power distribution circuit can interrupt the expected fault current within the short-circuit withstand range with the help of the first fuse 260. Miniature circuit breakers are smaller in size, thereby optimizing installation space and reducing costs.

[0068] Figure 3 A schematic diagram of another energy storage distribution cabinet 200 provided in an embodiment of this disclosure is shown. Figure 3 As shown, in one embodiment, the energy storage distribution cabinet 200 further includes a surge protector 270. One end of the surge protector 270 is electrically connected to the output terminal 220, and the other end of the surge protector 270 is grounded. When the output terminal 220 is a terminal block, the surge protector 270 is electrically connected to the corresponding terminal. By setting the surge protector 270, transient overvoltages can be suppressed, surge currents can be discharged, and short circuits caused by breakdown of insulating components in the energy storage distribution cabinet 200 can be avoided, thereby improving the safety and reliability of the energy storage distribution cabinet 200.

[0069] Figure 4 This diagram illustrates the structure of another energy storage distribution cabinet 200 provided in an embodiment of the present disclosure. Figure 4As shown, in one embodiment, the power detection module 240 includes a current transformer 241, an AC power meter 242, and a second fuse 243. The current transformer 241 is electrically connected to a first fuse 260 and a first circuit breaker 230. The current transformer 241 is electrically connected to one end of the AC power meter 242, and the other end of the AC power meter 242 is electrically connected to the output terminal 220 through the second fuse 243.

[0070] Current transformer 241 is electrically connected to the first fuse 260 and the first circuit breaker 230, meaning it is connected in series in the power distribution circuit. It is used to convert large currents (such as 100A-500A AC 380V) in the power distribution circuit into smaller currents (such as 5A or 1A) at a fixed ratio (such as 100:5 or 200:5), thereby adapting to the measurement range of the AC energy meter 242 and effectively preventing large currents from being directly connected to the AC energy meter 242 and causing it to burn out. Current transformer 241 can also be a Hall sensor or other component used to detect the magnitude of current in the power distribution circuit; no specific limitation is made here.

[0071] The AC energy meter 242 calculates and accumulates the power consumption and power generation of the distribution circuit according to the standard current signal converted by the current transformer 241 and the directly acquired AC voltage signal, based on the energy calculation algorithm.

[0072] The second fuse 243 can disconnect the circuit where the power detection module 240 is located when an abnormal overload or short circuit occurs, so as to ensure the safety of the current transformer 241 or the AC energy meter 242 and prevent damage to the current transformer 241 or the AC energy meter 242 due to excessive current.

[0073] Figure 5 A schematic diagram of the structure of another energy storage distribution cabinet 200 provided in an embodiment of this disclosure is shown. Figure 5 As shown, in one embodiment, the load power module 250 includes at least one first load branch 251, each first load branch 251 including a first miniature circuit breaker 2511 and a first load power supply 2512, the first load power supply 2512 being electrically connected to the output terminal 220 through the first miniature circuit breaker 2511.

[0074] The number of first load branches 251 in the load power module 250 can be determined according to the capacity of the energy storage distribution cabinet 200 and the capacity of the load power supply. When the load power module 250 includes multiple first load branches 251, the multiple first load branches 251 are connected in parallel and electrically connected to the output terminal 220 respectively. Figure 5 In the middle, the load power module 250 includes two first load branches 251, which are electrically connected to the output terminal 220 respectively.

[0075] Each first load branch 251 includes a first miniature circuit breaker 2511 and a first load power supply 2512. The first load power supply 2512 is electrically connected to the output terminal 220 through the first miniature circuit breaker 2511. That is, the first load power supply 2512 is electrically connected to the first miniature circuit breaker 2511, and the first miniature circuit breaker 2511 is electrically connected to the output terminal 220. The first miniature circuit breaker 2511 can be used to manually or automatically control the connection status of the first load power supply 2512 in the energy storage distribution cabinet 200.

[0076] The first load power supply 2512 is used for power adaptation and power supply, that is, converting the power of the energy storage system 100 into the power required by the downstream load, so as to ensure the continuity and safety of power supply.

[0077] It should be noted that the selection of the first miniature circuit breaker 2511 and the first load power supply 2512 can be determined according to the actual needs of the energy storage distribution cabinet 200.

[0078] In this embodiment of the disclosure, the first fuse 260 enables the short-circuit withstand capability of the first load branch 251, protecting the first miniature circuit breaker 2511 from damage.

[0079] Continue to refer to Figure 5 In one embodiment, the load power module 250 further includes at least one second load branch 252. Each second load branch 252 includes a second miniature circuit breaker 2521, a transformer 2522, and a load power submodule 2523. One end of the transformer 2522 is electrically connected to the output terminal 220 through the second miniature circuit breaker 2521, and the other end of the transformer 2522 is electrically connected to the load power submodule 2523.

[0080] In one embodiment, the number of second load branches 252 can be determined according to actual needs, for example, in Figure 5 In the middle, the load power module 250 is equipped with a second load branch 252.

[0081] The second load branch 252 can be used to convert the AC signal voltage according to the voltage matching requirements of the energy storage distribution cabinet 200 with the load and AC power, realizing bidirectional switching of voltage levels, i.e., step-up or step-down. For example, for low-voltage loads (such as lighting), AC 380V is converted to AC 240V through a step-down transformer to adapt to the voltage requirements of low-voltage loads; for high-voltage loads (such as high-voltage lighting systems), AC 380V is stepped up to 10kV through a high-voltage transformer to meet the voltage requirements of high-voltage loads.

[0082] The load power supply submodule 2523 is used to convert the AC signal obtained from the transformer 2522 into the power required by the downstream load, thereby ensuring the reliability and safety of the power supply.

[0083] It should be noted that the selection of the second miniature circuit breaker 2521 and the transformer 2522 can be determined according to the actual needs of the energy storage distribution cabinet 200.

[0084] In this embodiment of the disclosure, the function of the first fuse 260 is combined to improve the short-circuit withstand capability of the second load branch 252 and protect the second miniature circuit breaker 2521 from damage.

[0085] Continue to refer to Figure 5 In one embodiment, the load power supply submodule 2523 includes at least one first load subbranch 2524. Each first load subbranch 2524 includes a third miniature circuit breaker 25241 and a second load power supply 25242. The second load power supply 25242 is electrically connected to the other end of the transformer 2522 through the third miniature circuit breaker 25241. In combination with the first fuse 260, the short-circuit withstand capability of the first load subbranch 2524 is enhanced, and the third miniature circuit breaker 25241 is protected from damage.

[0086] The number of first load sub-branch 2524 can be determined according to the needs of energy storage distribution cabinet 200, and this disclosure does not make specific limitations. For example, in Figure 5 In the middle, the load power supply submodule 2523 includes a first load subbranch 2524.

[0087] When the load power supply submodule 2523 includes multiple first load sub-branch 2524, the multiple first load sub-branch 2524 are connected in parallel and electrically connected to the transformer 2522.

[0088] It should be noted that the selection of the third miniature circuit breaker 25241 and the second load power supply 25242 can be determined according to the actual needs of the energy storage distribution cabinet 200.

[0089] Continue to refer to Figure 5 In one embodiment, the load power supply submodule 2523 further includes a second load subbranch 2525, which includes a backup power supply 25251, an uninterruptible power supply 25252, and at least one third load subbranch. The backup power supply 25251 is electrically connected to the uninterruptible power supply 25252, and at least one third load subbranch is electrically connected to the other end of the transformer 2522 through the uninterruptible power supply 25252. The third load subbranch includes a fourth miniature circuit breaker 25253 and a third load power supply 25254, which is electrically connected to the uninterruptible power supply 25252 through the fourth miniature circuit breaker 25253.

[0090] Backup power supply 25251 is an emergency backup power supply in energy storage distribution cabinet 200, providing short-term power supply when AC power is interrupted.

[0091] The uninterruptible power supply 25252 is used to achieve zero-interruption switching between AC power and backup power supply 25251, providing stable and continuous power.

[0092] The number of third load sub-branches can be determined according to actual needs. The third load sub-branches include a fourth miniature circuit breaker 25253 and a third load power supply 25254 connected in series. In some embodiments, the third load sub-branches may also include a switching power supply. Figure 5 In the middle, the second load sub-branch 2525 includes three third load sub-branches, which are connected in parallel and electrically connected to the uninterruptible power supply 25252.

[0093] Figure 6 The diagram shows the cutoff curve of the first fuse 260 provided in an embodiment of this disclosure. Figure 6 As shown in the cutoff curve, the horizontal axis represents the short-circuit impact current (A), and the vertical axis represents the breaking current (A). Figure 6 The cut-off curves corresponding to different models of the first fuse 260 are shown. The first fuse 260 can be selected from different models of current-limiting fuses. Combined with the short-circuit withstand capability of other electrical components in the power distribution circuit, the short-circuit withstand capability of the energy storage distribution cabinet 200 can be greatly improved through the function of the current-limiting fuse, ensuring the safety of the electrical components in the energy storage distribution cabinet 200.

[0094] Taking 100FE as an example, the performance of the first fuse 260 is explained. When the maximum breaking capacity of the first circuit breaker 230 is 10kA, if 10kA is used as the breaking current of the first fuse 260, the expected short-circuit impulse current can be 200kA. When the rated thermal short-time current of the current transformer 241 is 4kA, if 4kA is used as the breaking current of the first fuse 260, the expected short-circuit impulse current is less than or equal to 100kA.

[0095] Figure 7 This diagram illustrates the structure of an energy storage system 100 provided in an embodiment of the present disclosure. Figure 7 As shown, this disclosure also provides an energy storage system 100, such as an energy storage power station or an energy storage container, which includes at least one energy storage distribution cabinet 200 as described in the above embodiments. In this disclosure, the energy storage distribution cabinet 200 described above can improve the safety of the energy storage system 100 and reduce safety hazards.

[0096] In one embodiment, the energy storage system 100 may include multiple energy storage distribution cabinets 200 and input terminal blocks. The input terminal 210 of each energy storage distribution cabinet 200 is electrically connected to the corresponding port of the input terminal block, so that the multiple energy storage distribution cabinets 200 are connected in parallel and electrically connected to the AC bus to input AC signals.

[0097] As for the embodiment of energy storage system 100, since it includes energy storage distribution cabinet 200, the description is relatively simple. For relevant details, please refer to the description of the embodiment of energy storage distribution cabinet 200.

[0098] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0099] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An energy storage distribution cabinet, characterized in that, include: Input terminals are used to input AC signals; Output terminals are used to output AC signals; A first circuit breaker, which is electrically connected to the input terminal and the output terminal; The power detection module is connected in parallel with the first circuit breaker; A load power supply module, wherein the load power supply module is electrically connected to the output terminal; It also includes: a first fuse, which is electrically connected to the input terminal and the first circuit breaker.

2. The energy storage distribution cabinet according to claim 1, characterized in that, The first fuse includes a current-limiting fuse.

3. The energy storage distribution cabinet according to claim 1, characterized in that, The first circuit breaker includes a miniature circuit breaker or a molded case circuit breaker.

4. The energy storage distribution cabinet according to claim 1, characterized in that, The power detection module includes a current transformer, an AC power meter, and a second fuse. The current transformer is electrically connected to the first fuse and the first circuit breaker. The current transformer is electrically connected to one end of the AC power meter, and the other end of the AC power meter is electrically connected to the output terminal through the second fuse.

5. The energy storage distribution cabinet according to claim 1, characterized in that, The load power module includes at least one first load branch, each first load branch including a first miniature circuit breaker and a first load power supply, the first load power supply being electrically connected to the output terminal through the first miniature circuit breaker.

6. The energy storage distribution cabinet according to claim 5, characterized in that, The load power module further includes at least one second load branch. Each second load branch includes a second miniature circuit breaker, a transformer, and a load power submodule. One end of the transformer is electrically connected to the output terminal through the second miniature circuit breaker, and the other end of the transformer is electrically connected to the load power submodule.

7. The energy storage distribution cabinet according to claim 6, characterized in that, The load power supply submodule includes at least one first load sub-branch, each first load sub-branch includes a third miniature circuit breaker and a second load power supply, the second load power supply being electrically connected to the other end of the transformer through the third miniature circuit breaker.

8. The energy storage distribution cabinet according to claim 6, characterized in that, The load power supply submodule further includes a second load sub-branch, which includes a backup power supply, an uninterruptible power supply (UPS), and at least one third load sub-branch. The backup power supply is electrically connected to the UPS, and at least one third load sub-branch is electrically connected to the other end of the transformer through the UPS. Each third load sub-branch includes a fourth miniature circuit breaker and a third load power supply, and the third load power supply is electrically connected to the UPS through the fourth miniature circuit breaker.

9. The energy storage distribution cabinet according to any one of claims 1-8, characterized in that, The energy storage distribution cabinet also includes a surge protector, one end of which is electrically connected to the output terminal, and the other end of which is grounded.

10. An energy storage system, characterized in that, It includes at least one energy storage distribution cabinet as described in any one of claims 1 to 9.

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