Energy storage system and electric device

Abstract

This application discloses an energy storage system and an electrical device. The energy storage system includes: a switching circuit connected between the load and the power grid; a battery circuit connected in parallel between the load and the power grid, including: an energy routing circuit comprising a first routing circuit and a second routing circuit, one end of the first routing circuit being connected to one end of the switching circuit, and one end of the second routing circuit being connected to the other end of the switching circuit; and a battery array connected to the other ends of the first and second routing circuits. The switching circuit is in an open state, allowing the power grid or the battery array to supply power to the load, or the power grid to charge the battery array. This solution achieves effective isolation between the load and the power grid while meeting the load's power demand.

Description

Technical Field

[0001] This application relates to the field of power management, and in particular to an energy storage system and an electrical device. Background Technology

[0002] With the exponential growth in demand for artificial intelligence (AI) computing power, data centers, as the core carriers of AI computing infrastructure, face severe challenges in terms of energy consumption and power supply stability.

[0003] Currently, data center power supply systems primarily rely on direct grid power. However, in this model, grid disturbances, such as voltage fluctuations and harmonic pollution, directly impact the power quality of the data center. Furthermore, the start-up and shutdown of high-power equipment in the data center also negatively impacts the grid. Additionally, this model experiences power shortages during peak electricity consumption periods, failing to meet the peak load demands of the data center. In other words, while meeting the data center's power needs, there is a lack of effective isolation mechanisms between the data center and the power grid. Utility Model Content

[0004] According to embodiments of this application, this application proposes an energy storage system and an electrical device.

[0005] This application provides an energy storage system, comprising: a switching circuit connected between a load and a power grid; a battery circuit connected in parallel between the load and the power grid, comprising: an energy routing circuit including a first routing circuit and a second routing circuit, one end of the first routing circuit being connected to one end of the switching circuit, and one end of the second routing circuit being connected to the other end of the switching circuit; and a battery array connected to the other ends of the first routing circuit and the second routing circuit; wherein the switching circuit is in an open state, thereby the power grid or the battery array supplies power to the load, or the power grid charges the battery array.

[0006] In the above scheme, the energy storage system includes a switching circuit and a battery circuit. The battery circuit is connected in parallel between the load and the power grid, including a first routing circuit, a second routing circuit, and a battery array, to meet the power demand of the load. The switching circuit is connected between the load and the power grid and is in an open state to achieve physical isolation between the load and the power grid, eliminate the impact of power grid fluctuations (such as voltage drops and frequency shifts) on the load, and ensure power quality. Thus, effective isolation between the load and the power grid is achieved while meeting the power demand of the load.

[0007] In some embodiments, it further includes: another switching circuit connected in parallel or in series with the switching circuit; another battery circuit connected in parallel or in series with the battery circuit, including: another energy routing circuit, including a third routing circuit and a fourth routing circuit, one end of the third routing circuit being connected to one end of the other switching circuit, and one end of the fourth routing circuit being connected to the other end of the other switching circuit; and another battery array connected to the other ends of the third routing circuit and the fourth routing circuit.

[0008] In the above scheme, the energy storage system includes another switching circuit and another battery circuit. The other switching circuit is connected in parallel or series with the switching circuit, and the other battery circuit is connected in parallel or series with the battery circuit. This enables different battery circuits to respond in a time-sharing manner, balance short-term high power demand, reduce dependence on the instantaneous power supply capacity of the power grid, and achieve decoupling control of different loads in the data center. This reduces the PUE of the data center, reduces the proportion of non-IT loads (cooling / power distribution system), eliminates the disturbance of instantaneous load impact on the power grid, and ensures the stability of the power grid.

[0009] In some embodiments, the other switching circuit is connected in parallel with the switching circuit between the load and the power grid; the other battery circuit is connected in parallel with the battery circuit, and the other battery circuit is connected in parallel between the load and the power grid.

[0010] In the above scheme, another switching circuit is connected in parallel between the load and the power grid; another battery circuit is connected in parallel between the load and the power grid, thereby achieving decoupling control of different loads in the data center, which can reduce the PUE of the data center, reduce the proportion of non-IT loads, eliminate the disturbance of instantaneous load impacts on the power grid, and ensure the stability of the power grid side.

[0011] In some embodiments, the other switching circuit is connected in series with the switching circuit between the load and the power grid, wherein one end of the other switching circuit is connected to the other end of the switching circuit, and the other end of the other switching circuit is connected to the load; the other battery circuit is connected in series with the battery circuit, and the other battery circuit is connected in parallel between the load and the power grid.

[0012] In the above scheme, another switching circuit is connected in series between the load and the power grid, wherein one end of the other switching circuit is connected to the other end of the other switching circuit, and the other end of the other switching circuit is connected to the load; another battery circuit is connected in series with the battery circuit, and another battery circuit is connected in parallel between the load and the power grid, so as to realize the time-sharing response of different battery circuits, balance the short-term high power demand, reduce the dependence on the instantaneous power supply capacity of the power grid, and at the same time realize the physical isolation between the power grid and the load, eliminate the impact of power grid fluctuations on the load, and improve the stability of the load power supply.

[0013] In some embodiments, the rated output power of the battery array differs from that of the other battery array.

[0014] In the above scheme, by having different rated output powers for one battery array and another, it is possible to match the power supply or energy storage requirements under different scenarios, improve the availability of the system, and achieve differentiated configuration by using different battery arrays, thereby enabling time-sharing response, balancing short-term high power demand, and reducing dependence on the instantaneous power supply capacity of the power grid.

[0015] In some embodiments, the rated output power of the battery array is greater than the rated output power of the other battery array.

[0016] In the above scheme, by having the rated output power of one battery array be greater than that of another battery array, time-sharing response is achieved, balancing short-term high power demand and reducing dependence on the instantaneous power supply capacity of the power grid.

[0017] In some embodiments, the first routing circuit, the second routing circuit, the third routing circuit, and the fourth routing circuit each include a transformer and a bidirectional converter connected in series, wherein one end of the transformer serves as one end of the first routing circuit, the second routing circuit, the third routing circuit, or the fourth routing circuit, and the other end of the transformer is connected to one end of the bidirectional converter, and the other end of the bidirectional converter serves as the other end of the first routing circuit, the second routing circuit, the third routing circuit, or the fourth routing circuit.

[0018] In the above scheme, the transformer and the bidirectional converter are connected in series. One end of the transformer serves as one end of the first, second, third, or fourth routing circuit, and the other end of the bidirectional converter serves as the other end of the first, second, third, or fourth routing circuit. This can achieve electrical isolation, suppress harmonics and electromagnetic interference, and improve the reliability and stability of the system operation.

[0019] In some embodiments, the system further includes a photovoltaic inverter and a photovoltaic array connected in series, wherein the photovoltaic inverter and the photovoltaic array are connected in parallel with the battery array at the other end of the first routing circuit and the other end of the second routing circuit, and the photovoltaic array supplies power to the load through the photovoltaic inverter and the second routing circuit.

[0020] In the above scheme, the energy storage system also includes a series photovoltaic inverter and a photovoltaic array. The series photovoltaic inverter and photovoltaic array are connected in parallel with the battery array. The photovoltaic power generation and the battery array work together to achieve redundant power supply, ensure the continuous and stable power supply of the system, reduce the dependence on grid power supply, reduce the pressure of battery array power supply alone, suppress voltage and current surges, and improve electrical operation stability.

[0021] In some embodiments, when the output power of the photovoltaic array is greater than the input power of the load, the photovoltaic array also supplies power to the battery array through the photovoltaic inverter; when the output power of the photovoltaic array is less than a preset power, the power grid charges the battery array through the first routing circuit, and the battery array supplies power to the load through the second routing circuit.

[0022] In the above scheme, by determining the output power of the photovoltaic array and the output power of the load, the continuous power supply time of the energy storage system can be delayed, improving the utilization efficiency of photovoltaic energy and reducing dependence on grid power. By determining the output power of the photovoltaic array and the preset power, coordinated scheduling among photovoltaic power generation, load power consumption, and battery array power supply can be achieved, ensuring the stability of load power supply.

[0023] A second aspect of this application provides an electrical device comprising: a load and the aforementioned energy storage system, wherein the load is connected to the energy storage system.

[0024] In the above scheme, the energy storage system includes a switching circuit and a battery circuit. The battery circuit is connected in parallel between the load and the power grid, including a first routing circuit, a second routing circuit, and a battery array, to meet the power demand of the load. The switching circuit is connected between the load and the power grid and is in an open state to achieve physical isolation between the load and the power grid, eliminate the impact of power grid fluctuations (such as voltage drops and frequency shifts) on the load, and ensure power quality. Thus, effective isolation between the load and the power grid is achieved while meeting the power demand of the load.

[0025] 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 application. Attached Figure Description

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0027] Figure 1 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 3 ;

[0030] Figure 4 This is a partial circuit diagram of the energy storage system according to an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 4 ;

[0032] Figure 6 This is a schematic diagram of the structure of the electrical device according to an embodiment of this application;

[0033] Figure 7 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 5 ;

[0034] Figure 8 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 6 . Detailed Implementation

[0035] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this document means two or more. Additionally, the term "at least one" in this document means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0037] In this document, the terms “coupled,” “connected,” and “linked” are used to refer to a direct or indirect connection between two objects. For example, when describing a first object coupled to a second object, the first object is considered to be coupled to the second object even if it is not in direct physical contact with the second object, but is indirectly in contact with the second object through a conductor and / or other objects. The term “circuit” is widely used and intended to include hardware implementations of both electronic components and conductors that, when connected and configured, enable the performance of the functions described in this application, without being limited to the type of electronic circuit.

[0038] In this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0039] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0040] The Battery Management System (BMS) of this application is used to perform at least one of the following functions for individual battery cells: state monitoring, state analysis, charge / discharge control, safety protection, thermal management, high-voltage power distribution, and information management. In addition, the Battery Management System of this application can also implement the functions of a controller in an electrical device, such as a vehicle control unit (VCU) or a motor control unit (MCU), etc., and this application does not impose any limitations on this.

[0041] It should be noted that the battery management system in this application can be integrated as a controller into the battery device, such as into the battery pack or energy storage box.

[0042] The battery management system described in this application can also be integrated as a controller into electrical devices, such as in a vehicle or vehicle chassis.

[0043] The battery management system in this application can also be integrated into the charging device as a controller, such as into the charging device or the battery swapping device.

[0044] The battery management system in this application can also be deployed as control software on a server. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms, such as vehicle networking cloud, APP backend, etc.

[0045] Currently, data center power supply systems primarily rely on direct grid power. However, in this model, grid disturbances, such as voltage fluctuations and harmonic pollution, directly impact the power quality of the data center. Furthermore, the start-up and shutdown of high-power equipment in the data center also negatively impacts the grid. Additionally, this model experiences power shortages during peak electricity consumption periods, failing to meet the peak load demands of the data center. In other words, while meeting the data center's power needs, there is a lack of effective isolation mechanisms between the data center and the power grid.

[0046] Therefore, this application utilizes an energy storage system comprising a switching circuit and a battery circuit. The battery circuit is connected in parallel between the load and the power grid, including a first routing circuit, a second routing circuit, and a battery array, to meet the load's power demand. Furthermore, the switching circuit connects the load and the power grid to achieve physical isolation between the load and the power grid, eliminating the impact of power grid fluctuations (such as voltage drops and frequency shifts) on the load and ensuring power quality. Thus, it achieves effective isolation between the load and the power grid while meeting the load's power demand.

[0047] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Please see Figure 1 , Figure 1 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 1 .like Figure 1As shown, the energy storage system 10 includes a switching circuit 11 and a battery circuit 12. The switching circuit 11 is connected between the load 20 and the power grid 30; the battery circuit 12, connected in parallel between the load 20 and the power grid 30, includes an energy routing circuit 121 and a battery array 122. The energy routing circuit 121 includes a first routing circuit 1211 and a second routing circuit 1212. One end of the first routing circuit 1211 is connected to one end of the switching circuit 11, and one end of the second routing circuit 1212 is connected to the other end of the switching circuit 11. The battery array 122 is connected to the other end of the first routing circuit 1211 and the other end of the second routing circuit 1212. When the switching circuit 11 is in an open state, the power grid 30 or the battery array 122 supplies power to the load 20, or the power grid 30 charges the battery array 122.

[0049] The energy storage system 10 can also be called an energy storage device.

[0050] Load 20 refers to equipment that centrally deploys servers, storage devices, network communication equipment, and supporting infrastructure such as power supply and distribution, cooling, fire protection, and monitoring. This equipment consumes electrical energy and performs actual computing, storage, or network communication tasks; for example, it could refer to a data center. A data center can include both IT and non-IT loads. Non-IT loads can be infrastructure such as cooling and power supply / distribution systems. IT loads can be equipment used for AI training or inference. Currently, the PUE (Power Usage Effectiveness) of data centers is around 1.5, with non-IT loads, including 15% of cooling equipment and 80% of power supply / distribution equipment, accounting for as much as 65% of energy consumption. For example, a data center can include base load and jump load.

[0051] Power grid 30 refers to the power network used to transmit and distribute electrical energy from the generation end to various power consumption segments. Power grid 30 may include power plants, transmission lines, substations, distribution lines, etc. It should be noted that... Figure 1 The power grid 30 can be connected to the energy storage system 10 via a transformer, such as an MV / HV (Medium Voltage / High Voltage) transformer, so that the power grid 30 can provide electrical energy.

[0052] The switching circuit 11 may include electronic circuits of devices such as switches or switching transistors, and has a conducting state and an open state. The conducting state indicates that the two ends of the switching circuit 11 are connected, and the open state indicates that the two ends of the switching circuit 11 are not connected or are disconnected.

[0053] In battery circuit 12, energy routing circuit 121 refers to an electronic circuit used for bidirectional, multi-port distribution, conversion, and scheduling of electrical energy. Energy routing circuit 121 may include a first routing circuit 1211 and a second routing circuit 1212. Battery array 122 refers to a large-scale integrated energy storage and power supply device formed by orderly arranging and electrically connecting at least one battery cell according to a preset connection method. In this application, battery array 122 may include at least one battery cell and a battery management system. The connection method between multiple battery cells can be achieved through conventional methods in the art, such as series connection, parallel connection, or a hybrid connection including these connection methods. Hybrid connection refers to multiple batteries connected in series and parallel, and is not particularly limited in this respect.

[0054] In some examples, the energy storage system 10 may contain multiple modular battery clusters, each of which may be a battery array 122 with an independent BMS (Battery Management System). That is, the number of battery arrays 122 in the energy storage system 10 may be one or more, without specific limitation.

[0055] When the switching circuit 11 is in the open state, the power grid 30 can supply power to the load 20. For example, under the condition that the power quality of the power grid 30 is stable, i.e., the voltage signal waveform is ideal (e.g., a sine wave), the voltage signal frequency is stable (e.g., 50Hz), and the current signal waveform or current signal frequency is ideal, the power output of the power grid 30 can be delivered to the load 20 through the first routing circuit 1211 and then through the second routing circuit 1212 to supply power to the load 20. For example, under the condition that the power quality of the power grid 30 is unstable, i.e., voltage deviation, frequency deviation, waveform distortion, voltage fluctuation and flicker, three-phase imbalance, transient interference, etc., the power output of the power grid 30 can be delivered to the battery array 122 through the first routing circuit 1211. The battery array 122 processes the acquired power and delivers the processed power to the load 20 through the second routing circuit 1212 to supply power to the load 20.

[0056] When the switching circuit 11 is in the open state, the battery array 122 can supply power to the load 20. For example, under conditions of unstable power quality in the power grid 30, the battery array 122 can supply power to the load 20 by transmitting its stored electrical energy to the load 20 through the second routing circuit 1212. For example, when the load 20 has a peak power demand, such as a peak power demand of 2735W, the battery array 122 can supply power to the load 20 by transmitting its stored electrical energy to the load 20 through the second routing circuit 1212.

[0057] When the switching circuit 11 is in the open state, the power grid 30 can charge the battery array 122. For example, during periods of low electricity prices, the electrical energy output by the power grid 30 can be delivered to the battery array 122 through the first routing circuit 1211 to charge the battery array 122.

[0058] In this embodiment, the energy storage system 10 includes a switching circuit 11 and a battery circuit 12. The battery circuit 12 is connected in parallel between the load 20 and the power grid 30 and includes a first routing circuit, a second routing circuit, and a battery array to meet the power demand of the load 20. The switching circuit 11 is connected between the load 20 and the power grid 30 and is in an open state to achieve physical isolation between the load 20 and the power grid 30, eliminate the impact of power grid fluctuations (such as voltage drops and frequency shifts) on the load 20, and ensure power quality. Thus, effective isolation between the load 20 and the power grid 30 is achieved while meeting the power demand of the load 20.

[0059] In some embodiments, Figure 2 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 2 , Figure 3 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 3 .like Figure 2 and Figure 3 As shown, the energy storage system 10 also includes another switching circuit 13 and another battery circuit 14. The other switching circuit 13 is connected in parallel or series with the switching circuit 11; the other battery circuit 14 is connected in parallel or series with the battery circuit 12, and includes another energy routing circuit 141 and another battery array 142. The other energy routing circuit 141 includes a third routing circuit 1411 and a fourth routing circuit 1412. One end of the third routing circuit 1411 is connected to one end of the other switching circuit 13, and one end of the fourth routing circuit 1412 is connected to the other end of the other switching circuit 13; the other battery array 142 is connected to the other ends of the third routing circuit 1411 and the fourth routing circuit 1412.

[0060] Another switching circuit 13 is an electronic circuit that may include devices such as switches and switching transistors, and has a conducting state and an open state. The conducting state indicates that the two ends of the other switching circuit 13 are connected, and the open state indicates that the two ends of the other switching circuit 13 are not connected or are disconnected.

[0061] In another battery circuit 14, the other energy routing circuit 141 refers to an electronic circuit used for bidirectional, multi-port distribution, conversion, and scheduling of electrical energy. The energy routing circuit 121 may include a third routing circuit 1411 and a fourth routing circuit 1412. The other battery array 142 refers to a large-scale integrated energy storage and power supply device formed by orderly arranging and electrically connecting at least one battery cell according to a preset connection method. In this application, the other battery array 142 may include at least one battery cell and a battery management system. The connection method between multiple battery cells can be achieved through conventional methods in the art, such as series connection, parallel connection, or a hybrid connection including these connection methods. Hybrid connection refers to multiple batteries connected in series and parallel, and is not particularly limited in this respect.

[0062] When switch circuit 11 is in the open state and another switch circuit 13 is in the open state, the power grid 30 can supply power to the load 20, or the power grid 30 can charge the battery array 122 and / or another battery array 142.

[0063] When switch circuit 11 is in the off state and another switch circuit 13 is in the off state, battery array 122 and / or another battery array 142 can supply power to load 20.

[0064] In this embodiment, the energy storage system 10 includes another switching circuit 13 and another battery circuit 14. The other switching circuit 13 is connected in parallel or in series with the switching circuit 11, and the other battery circuit 14 is connected in parallel or in series with the battery circuit 12. This enables different battery circuits to respond in a time-sharing manner, balance short-term high power demand, reduce dependence on the instantaneous power supply capacity of the power grid 30, and achieve decoupling control of different loads in the data center. This reduces the PUE of the data center, reduces the proportion of non-IT loads, eliminates the disturbance of instantaneous load impacts on the power grid 30, and ensures the stability of the power grid 30.

[0065] In some embodiments, such as Figure 2 As shown, another switch circuit 13 is connected in parallel with switch circuit 11 between load 20 and power grid 30; another battery circuit 14 is connected in parallel with battery circuit 12, and the other battery circuit 14 is connected in parallel between load 20 and power grid 30.

[0066] The power grid 30 can supply power to the load 20 through another switching circuit 13 and another battery circuit 14, or it can supply power to the load 20 through a switching circuit 11 and a battery circuit 12.

[0067] When the other switching circuit 13 is in the open state, the switching circuit 11 can be either in the open or open state. The power grid 30 can supply electrical energy to the other battery array 142 via the third routing circuit 1411 to charge the other battery array 142. Alternatively, the power grid 30 can supply power to the load 20 via another energy routing circuit 141. Or, the other battery array 142 can supply power to the load 20 via the fourth routing circuit 1412.

[0068] When switch circuit 11 is in the open state, another switch circuit 13 can be either in the open or closed state. The power grid 30 can supply electrical energy to the battery array 122 via the first routing circuit 1211 to charge the battery array 122. Alternatively, the power grid 30 can supply power to the load 20 via the energy routing circuit 121. Alternatively, the battery array 122 can supply power to the load 20 via the second routing circuit 1212.

[0069] In this embodiment, another switching circuit 13 is connected in parallel with the switching circuit 11 between the load 20 and the power grid 30; another battery circuit 14 is connected in parallel with the battery circuit 12, and the other battery circuit 14 is connected in parallel between the load 20 and the power grid 30, thereby achieving decoupling control of different loads in the data center, which can reduce the PUE of the data center, reduce the proportion of non-IT loads, eliminate the disturbance of instantaneous load impacts on the power grid 30, and ensure the stability of the power grid 30 side.

[0070] In some embodiments, such as Figure 3 As shown, another switching circuit 13 is connected in series with the switching circuit 11 between the load 20 and the power grid 30. One end of the other switching circuit 13 is connected to the other end of the switching circuit 11, and the other end of the other switching circuit 13 is connected to the load 20. Another battery circuit 14 is connected in series with the battery circuit 12, and the other battery circuit 14 is connected in parallel between the load 20 and the power grid 30.

[0071] With another switching circuit 13 and switching circuit 11 both in the open state, the power grid 30 can supply power to the load 20 via another battery array 142 and battery array 122. For example, the electrical energy output from the power grid 30 can be delivered to the load 20 via energy routing circuit 121 and another energy routing circuit 141 to supply power to the load 20. Similarly, the electrical energy output from the power grid 30 can be delivered to another battery array 142 via energy routing circuit 121 and another energy routing circuit 141 to supply power to the battery array 142. For example, the electrical energy output from the power grid 30 can be delivered to the battery array 122 via energy routing circuit 121 to supply power to the battery array 122. For example, the battery array 122 can deliver its stored electrical energy to the load 20 via a second routing circuit 1212 and then via another energy routing circuit 141 to supply power to the load 20. For example, the other battery array 142 can deliver its stored electrical energy to the load 20 via a fourth routing circuit 1412 to supply power to the load 20.

[0072] In this embodiment, another switching circuit 13 is connected in series with the switching circuit 11 between the load 20 and the power grid 30. One end of the other switching circuit 13 is connected to the other end of the switching circuit 11, and the other end of the other switching circuit 13 is connected to the load 20. Another battery circuit 14 is connected in series with the battery circuit 12 and in parallel between the load 20 and the power grid 30. This allows for time-sharing response of different battery circuits, balancing short-term high power demands, reducing dependence on the instantaneous power supply capacity of the power grid 30, and simultaneously achieving physical isolation between the power grid 30 and the load 20. This eliminates the impact of power grid 30 fluctuations on the load 20 and improves the stability of the power supply to the load 20.

[0073] In some embodiments, the rated output power of battery array 122 is different from that of another battery array 142.

[0074] In some examples, battery array 122 can be a 1P energy cell, for example, a 1P energy cell may include multiple 285Ah high-power cells, where a 1P energy cell refers to an energy storage power supply device capable of completing full-power charging or discharging within one hour. Another battery array 142 can be a 0.5P energy cell, for example, a 0.5P energy cell may include multiple 530Ah low-power cells, where a 0.5P energy cell refers to an energy storage power supply device capable of completing full-power charging or discharging within two hours.

[0075] In this embodiment, by having different rated output powers for battery array 122 and another battery array 142, it is possible to match the power supply or energy storage requirements under different scenarios, improve the availability of the system, and achieve differentiated configuration by using different battery arrays 122, thereby enabling time-sharing response, balancing short-term high power demand, and reducing dependence on the instantaneous power supply capacity of the power grid.

[0076] In some embodiments, the rated output power of battery array 122 is greater than the rated output power of another battery array 142.

[0077] In some examples, battery array 122 is a 1P energy cell, which may include multiple 285Ah high-power cells. Another battery array 142 is a 0.5P energy cell, which may include multiple 530Ah low-power cells. The rated output power of battery array 122 is greater than that of battery array 142.

[0078] In this embodiment, by having the rated output power of battery array 122 greater than that of another battery array 142, time-sharing response is achieved, balancing short-term high power demand and reducing dependence on the instantaneous power supply capacity of the power grid.

[0079] In some embodiments, Figure 4 This is a partial circuit diagram of an energy storage system according to an embodiment of this application. Figures 1-4 As shown, the first routing circuit 1211, the second routing circuit 1212, the third routing circuit 1411, and the fourth routing circuit 1412 all include a transformer 401 and a bidirectional converter 402 connected in series. One end of the transformer 401 serves as one end of the first routing circuit 1211, the second routing circuit 1212, the third routing circuit 1411, or the fourth routing circuit 1412. The other end of the transformer 401 is connected to one end of the bidirectional converter 402, and the other end of the bidirectional converter 402 serves as the other end of the first routing circuit 1211, the second routing circuit 1212, the third routing circuit 1411, or the fourth routing circuit 1412.

[0080] Transformer 401 refers to an electrical device that converts AC voltage and current and transmits electrical energy without changing the AC frequency. Bidirectional converter 402 refers to an electronic device that can adjust the bidirectional transmission of energy according to system requirements; for example, it can be a DC / AC (Direct Current to Alternating Current) bidirectional converter or a PCS (Power Conversion System).

[0081] In this circuit, one end of transformer 401 serves as one end of the first routing circuit 1211 and the second routing circuit 1212, and is connected to the switch circuit 11. Another end of transformer 401 serves as one end of the third routing circuit 1411 and the fourth routing circuit 1412, and is connected to another switch circuit 13. The other end of transformer 401 is connected to one end of bidirectional converter 402, meaning transformer 401 and bidirectional converter 402 are connected in series. The other end of bidirectional converter 402 serves as the other end of the first routing circuit 1211 and the second routing circuit 1212, and is connected to the battery array 122. The other end of bidirectional converter 402 serves as the other end of the third routing circuit 1411 and the fourth routing circuit 1412, and is connected to another battery array 142.

[0082] In this embodiment, transformer 401 is connected in series with bidirectional converter 402. One end of transformer 401 serves as one end of the first routing circuit 1211, the second routing circuit 1212, the third routing circuit 1411, or the fourth routing circuit 1412, and the other end of bidirectional converter 402 serves as the other end of the first routing circuit 1211, the second routing circuit 1212, the third routing circuit 1411, or the fourth routing circuit 1412. This enables electrical isolation, suppresses harmonics and electromagnetic interference, and improves the reliability and stability of system operation.

[0083] In some embodiments, Figure 5 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 4 .like Figure 5 As shown, the energy storage system 10 also includes a photovoltaic inverter 15 and a photovoltaic array 16 connected in series. The photovoltaic inverter 15 and the photovoltaic array 16 are connected in parallel with the battery array 122 to the other end of the first routing circuit 1211 and the other end of the second routing circuit 1212. The photovoltaic array 16 supplies power to the load 20 through the photovoltaic inverter 15 and the second routing circuit 1212.

[0084] A photovoltaic inverter 15 refers to an electronic device that converts the direct current (DC) generated by the photovoltaic array 16 into alternating current (AC) power that can be used by the power grid 30 or the load 20. A photovoltaic array 16 refers to a power generation device that converts solar radiation energy into direct current (DC) power. For example, the photovoltaic array 16 includes multiple monocrystalline silicon solar panels connected in series / parallel to form a unified output voltage, such as DC 600V.

[0085] The photovoltaic array 16 is connected to the photovoltaic inverter 15, which can be configured with a maximum power point tracking (MPPT) controller to adjust the operating point in real time to match changes in light intensity.

[0086] In some examples, the series-connected photovoltaic inverter 15 and photovoltaic array 16 are connected in parallel with the battery array 122 to the other end of the first routing circuit 1211 and the other end of the second routing circuit 1212. The photovoltaic inverter 15 can output three-phase AC power, such as 400V / 50Hz AC power. The photovoltaic array 16 supplies power to the load 20 through the photovoltaic inverter 15 and the second routing circuit 1212.

[0087] In this embodiment, the energy storage system 10 also includes a series-connected photovoltaic inverter 15 and a photovoltaic array 16. The series-connected photovoltaic inverter 15 and photovoltaic array 16 are connected in parallel with the battery array 122. The photovoltaic power generation and the battery array 122 work together to achieve redundant power supply, ensure continuous and stable power supply of the system, reduce dependence on the power supply of the grid 30, reduce the pressure of the battery array 122 supplying power alone, suppress voltage and current surges, and improve electrical operation stability.

[0088] In some embodiments, such as Figure 5 As shown, when the output power of the photovoltaic array 16 is greater than the input power of the load 20, the photovoltaic array 16 also supplies power to the battery array 122 through the photovoltaic inverter 15; when the output power of the photovoltaic array 16 is less than the preset power, the power grid 30 charges the battery array 122 through the first routing circuit 1211, and the battery array 122 supplies power to the load 20 through the second routing circuit 1212.

[0089] In some examples, the energy storage system 10 is in green charging mode, and the photovoltaic array 16 supplies power to the load 20 through the photovoltaic inverter 15 and the second routing circuit 1212. When the output power of the photovoltaic array 16 is greater than the input power of the load 20, the photovoltaic array 16 charges the battery array 122 through the photovoltaic inverter 15 to store the excess electrical energy in the battery array 122.

[0090] In some examples, the energy storage system 10 is in grid 30 charging mode. When the output power of the photovoltaic array 16 is less than the preset power, the grid 30 steps down the voltage through the transformer 401 and then charges the battery array 122 through the first routing circuit 1211. For example, during off-peak hours when the electricity price of the grid 30 is low, the grid 30 steps down the voltage through the transformer 401 and then charges the battery array 122 through the first routing circuit 1211.

[0091] In some examples, when the energy storage system 10 is in discharge mode and the output power of the photovoltaic array 16 is less than a preset power, the battery array 122 supplies power to the load 20 through the second routing circuit 1212. For example, when the power grid 30 is de-energized, the battery array 122 supplies power to the load 20 through the second routing circuit 1212.

[0092] In this embodiment, by determining the magnitude of the output power of the photovoltaic array 16 and the output power of the load 20, the continuous power supply time of the energy storage system 10 can be delayed, improving the utilization efficiency of photovoltaic energy and reducing dependence on the power supply of the grid 30. By determining the magnitude of the output power of the photovoltaic array 16 and the preset power, coordinated scheduling among the power generation of the photovoltaic array 16, the power consumption of the load 20, and the power supply of the battery array 122 can be achieved, ensuring the stability of the power supply to the load 20.

[0093] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application. The electrical device 100 includes a load 110 and an energy storage system 120, wherein the load 110 is connected to the energy storage system 120. For example, the energy storage system 120 can be the energy storage system 10 as described in the above embodiment. The description of the energy storage system 10 is detailed in the above embodiment description and will not be repeated here. It should be noted that the following description will refer to the energy storage system 10 as described in the above embodiment as the energy storage system 120.

[0094] In this application, the electrical device may be, but is not limited to, power equipment (such as electric vehicles, electric boats, spacecraft), electronic equipment (such as mobile phones, tablets, laptops, bionic machines, digital cameras, electric toys, etc.), wearable devices (such as watches, bracelets, VR glasses, etc.), energy storage power stations, etc.

[0095] In this embodiment, the electrical device 100 includes a load 110 and an energy storage system 120, wherein the load 110 and the energy storage system 120 are connected to meet the power demand of the load 110, achieve physical isolation between the load 110 and the power grid 30, eliminate the impact of power grid fluctuations (such as voltage drops and frequency shifts) on the load 110, and ensure power supply quality, thereby achieving effective isolation between the load 110 and the power grid 30 while meeting the power demand of the load 110.

[0096] In some embodiments, Figure 7 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 5 .like Figure 7 As shown, switch circuit 11 and another switch circuit 13 are in the open state. The electrical energy output from the power grid 30 can charge the battery array 122 through the transformer 401 and bidirectional converter 402 in the first routing circuit 1211. Alternatively, the power grid 30 can charge another battery array 142 through the transformer 401 and bidirectional converter 402 in the energy routing circuit 121 and the third routing circuit 1411.

[0097] Under the condition that the power quality of the power grid 30 is stable, the power output of the power grid 30 can also supply power to the load 20 through the energy routing circuit 121 and another energy routing circuit 141.

[0098] When there is a peak power demand in the load 20, the battery array 122 can deliver its stored electrical energy to the load 20 through the second routing circuit 1212 and another energy routing circuit 141 to power the load 20.

[0099] Another battery array 142 can deliver its stored electrical energy to the load 20 through the transformer 401 and bidirectional converter 402 of the fourth routing circuit 1412 to power the load 20.

[0100] Battery array 122 can supply power to grid 30 through first routing circuit 1211. Another battery array 142 can supply power to grid 30 through third routing circuit 1411 and energy routing circuit 121.

[0101] In some embodiments, Figure 8 This is a schematic diagram of the energy storage system according to an embodiment of this application. Figure 6 .like Figure 8 As shown, when the output power of the photovoltaic array 16 is less than the preset power, the switching circuit 11 is in the open state. The electrical energy output by the grid 30 can charge the battery array 122 through the transformer 401 and bidirectional converter 402 in the first routing circuit 1211. The electrical energy output by the grid 30 can then be used to power the load 20 through the first routing circuit 1211 and the second routing circuit 1212.

[0102] When the output power of the photovoltaic array 16 is less than the preset power, the switching circuit 11 is in the open state, and the battery array 122 can supply power to the load 20 through the transformer 401 and bidirectional converter 402 of the second routing circuit 1212.

[0103] The photovoltaic array 16 supplies power to the load 20 through the photovoltaic inverter 15 and the second routing circuit 1212. When the output power of the photovoltaic array 16 is greater than the input power of the load 20, the photovoltaic array 16 can also supply power to the battery array 122 through the photovoltaic inverter 15.

[0104] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0105] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0106] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0108] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0109] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. An energy storage system, characterized in that, include: A switching circuit, connected between the load and the power grid; The battery circuit, connected in parallel between the load and the power grid, includes: An energy routing circuit includes a first routing circuit and a second routing circuit, wherein one end of the first routing circuit is connected to one end of the switching circuit, and one end of the second routing circuit is connected to the other end of the switching circuit; A battery array is connected to the other end of the first routing circuit and the other end of the second routing circuit; The switching circuit is in an open state, so that the power grid or the battery array supplies power to the load, or the power grid charges the battery array.

2. The energy storage system according to claim 1, characterized in that, Also includes: Another switching circuit is connected in parallel or in series with the aforementioned switching circuit; Another battery circuit, connected in parallel or series with the battery circuit, includes: Another energy routing circuit includes a third routing circuit and a fourth routing circuit, one end of the third routing circuit is connected to one end of the other switching circuit, and one end of the fourth routing circuit is connected to the other end of the other switching circuit; Another battery array is connected to the other end of the third routing circuit and the other end of the fourth routing circuit.

3. The energy storage system according to claim 2, characterized in that, The other switching circuit is connected in parallel with the switching circuit between the load and the power grid; The other battery circuit is connected in parallel with the first battery circuit, and the other battery circuit is connected in parallel between the load and the power grid.

4. The energy storage system according to claim 2, characterized in that, The other switching circuit is connected in series with the switching circuit between the load and the power grid, wherein one end of the other switching circuit is connected to the other end of the switching circuit, and the other end of the other switching circuit is connected to the load; The other battery circuit is connected in series with the first battery circuit, and the other battery circuit is connected in parallel between the load and the power grid.

5. The energy storage system according to any one of claims 2-4, characterized in that, The rated output power of the battery array is different from that of the other battery array.

6. The energy storage system according to claim 5, characterized in that, The rated output power of the battery array is greater than the rated output power of the other battery array.

7. The energy storage system according to any one of claims 2-4, characterized in that, The first routing circuit, the second routing circuit, the third routing circuit, and the fourth routing circuit all include a transformer and a bidirectional converter connected in series. One end of the transformer serves as one end of the first routing circuit, the second routing circuit, the third routing circuit, or the fourth routing circuit, and the other end of the transformer is connected to one end of the bidirectional converter. The other end of the bidirectional converter serves as the other end of the first routing circuit, the second routing circuit, the third routing circuit, or the fourth routing circuit.

8. The energy storage system according to claim 1, characterized in that, It also includes a series-connected photovoltaic inverter and photovoltaic array, wherein the series-connected photovoltaic inverter and photovoltaic array are connected in parallel with the battery array to the other end of the first routing circuit and the other end of the second routing circuit, and the photovoltaic array supplies power to the load through the photovoltaic inverter and the second routing circuit.

9. The energy storage system according to claim 8, characterized in that, When the output power of the photovoltaic array is greater than the input power of the load, the photovoltaic array also supplies power to the battery array through the photovoltaic inverter; When the output power of the photovoltaic array is less than the preset power, the power grid charges the battery array through the first routing circuit, and the battery array supplies power to the load through the second routing circuit.

10. An electrical appliance, characterized in that, It includes a load and an energy storage system as described in any one of claims 1-9, wherein the load is connected to the energy storage system.

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