Energy storage system

Abstract

The utility model provides an energy storage system, which comprises a primary direct current bus, a power supply master station and an all-in-one machine, one end of a power supply module is connected with one end of the primary direct current bus, and the other end is externally connected with an alternating current power grid; an energy storage module, a photovoltaic module and a charging module are at least integrated in the all-in-one machine, the all-in-one machine comprises a secondary direct-current bus, the energy storage module, the photovoltaic module and the charging module are connected to one end of the secondary direct-current bus, and the all-in-one machine is connected with the other end of the primary direct-current bus through the other end of the secondary direct-current bus. According to the energy storage system and the all-in-one machine, a plurality of modules are compatible together, mutual cooperation of functions of all the modules is achieved through one whole body, the first-stage direct-current bus schedules and distributes the working power of all the all-in-one machines in a unified mode, and reasonable planning of the working power of a plurality of buildings can be adapted conveniently; and when the primary direct-current bus breaks down or is disconnected from the secondary direct-current bus, the all-in-one machine can deploy the electric energy transmitted to the secondary direct-current bus through the energy storage module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage power distribution, and particularly relates to an energy storage system. BACKGROUND

[0002] In the related art, the automobile charging pile, the photovoltaic system and the household energy storage system are independent systems, and the wiring is complex, the volume is large, and the installation, customer use and later maintenance are not convenient; and the photovoltaic system, the energy storage system, the charging pile and the load are connected to form a light storage module, and the light storage module is independently used for power distribution of different buildings, the photovoltaic system, the energy storage system, the charging pile and the load adopt a simple single bus direct current coordination topology mode, and a main control unit is arranged to realize bus communication control of each module on the single direct current bus. The function and scheduling strategy of large-scale unified power scheduling and independent operation of the lower micro-grid cannot be simultaneously achieved. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the embodiments of the present application provide an energy storage system, at least the energy storage module, the photovoltaic module and the charging module are integrated in the all-in-one machine, the complexity of the scattered arrangement and the independent operation wiring of each module is reduced, the working power of each all-in-one machine is uniformly scheduled and distributed through the first direct current bus, and reliable regulation is achieved.

[0004] The embodiments of the present application provide an energy storage system, which comprises:

[0005] a first direct current bus;

[0006] a power supply station comprising a power supply module, one end of the power supply module being connected with one end of the first direct current bus, and the other end being externally connected with an alternating current power grid;

[0007] an all-in-one machine, at least an energy storage module, a photovoltaic module and a charging module being integrated in the all-in-one machine, the all-in-one machine comprising a second direct current bus, the number of the all-in-one machines being at least one, the energy storage module, the photovoltaic module and the charging module being connected with one end of the second direct current bus, respectively, and the other end of the second direct current bus being connected with the other end of the first direct current bus.

[0008] In some embodiments, the number of the all-in-one machines is multiple, the power supply station comprises a main control unit, a slave control unit being integrated in each all-in-one machine, respectively, the main control unit being in communication connection with the power supply module and each slave control unit, the main control unit being used for calculating and predicting the power demand of each all-in-one machine, and scheduling the power of each all-in-one machine through the power supply module and the first direct current bus, and the slave control unit being used for receiving the scheduling instruction of the main control unit, and calculating, predicting and scheduling the power demand of the photovoltaic module, the charging module and the energy storage module.

[0009] In some embodiments, the number of the integrated machines is multiple, and each of the integrated machines is connected to the other end of the primary DC bus through the other end of the secondary DC bus.

[0010] The energy storage system comprises an isolating switch connected between the other end of each secondary DC bus and the primary DC bus, and the isolating switch is used to turn on or turn off the connection between the integrated machine and the primary DC bus.

[0011] In some embodiments, the working mode of the energy storage system comprises a grid-connected mode and an off-grid mode. In the grid-connected mode, the power module converts AC power into DC power and transmits the DC power to the primary DC bus or inversely converts the DC power on the primary DC bus into AC power to be connected to the AC grid, and the energy storage module receives power. In the off-grid mode, the energy storage module delivers DC power to the secondary DC bus.

[0012] In some embodiments, the integrated machine further integrates a DC load module, one end of the DC load module is connected to one end of the secondary DC bus, and the other end is used to provide DC power output;

[0013] In some embodiments, the integrated machine further integrates an AC load module, one end of the AC load module is connected to one end of the secondary DC bus, and the other end is used to provide AC power output.

[0014] In some embodiments, the energy storage module comprises a bidirectional DC power supply, an energy storage battery, and a battery management system. The bidirectional DC power supply is connected to the secondary DC bus and the energy storage battery, and the battery management system is connected to the energy storage battery to protect the energy storage battery from overcharging and overdischarging.

[0015] In some embodiments, the energy storage battery comprises at least one of a carbon-lead battery and a lithium iron phosphate battery.

[0016] In some embodiments, the charging module comprises a charging pile and a charging gun. The charging gun is connected to the charging pile and is used to access an electric vehicle to charge the electric vehicle.

[0017] In some embodiments, the integrated machine comprises a housing and a base. The energy storage module, the photovoltaic module, the charging module, the DC load module, and the AC load module are arranged in the housing, and the base is arranged at the bottom side of the housing to support the housing.

[0018] The integrated machine is internally formed with multiple sub-cavities, the charging pile is located in one of the sub-cavities, and the charging gun is located in another of the sub-cavities, and the charging gun is electrically connected with the charging pile to charge the electric vehicle.

[0019] In some embodiments, the housing is internally formed with multiple sub-cavities, the photovoltaic module, the charging module, the energy storage module, the DC load module and the AC load module are arranged in different sub-cavities, and the photovoltaic module, the charging module and the energy storage module are arranged in sequence from top to bottom along the height direction of the integrated machine.

[0020] In some embodiments, the charging module includes a charging pile and a charging gun, the charging pile is connected with the charging gun, the charging gun is used for accessing the electric vehicle to charge the electric vehicle, and the charging pile and the charging gun are located in different sub-cavities.

[0021] In some embodiments, the DC load module and / or the AC load module and the energy storage module are arranged side by side along a first direction, wherein the first direction is perpendicular to the height direction of the integrated machine.

[0022] And / or, the integrated machine is internally integrated with a slave unit, the slave unit is used for calculating, predicting and scheduling the electrical energy demand of each module inside the integrated machine, and the DC load module and / or the AC load module and the slave unit are arranged side by side along the height direction of the integrated machine.

[0023] In some embodiments, at least one lifting ring is formed on the top outside of the housing.

[0024] In some embodiments, the integrated machine further includes a heat dissipation fan for communicating the space inside the housing with the external environment.

[0025] The energy storage system provided by the embodiments of the present application integrates at least the energy storage module, the photovoltaic module and the charging module in the integrated machine, the integrated machine compatibly integrates multiple modules, reduces the complexity of scattered arrangement and independent operation of each module, realizes the mutual cooperation of the functions of each module through one whole body, centrally allocates resources, has high compactness and high convenience of use. And, the working power of each integrated machine is uniformly scheduled and distributed through the primary DC bus to realize reliable regulation, reduce the risk of overload during the peak period of the load, increase the power supply reliability, facilitate the reasonable planning of the working power of multiple buildings, when the primary DC bus fails or is disconnected with the secondary DC bus, each integrated machine can also supply electric energy to the secondary DC bus through the photovoltaic module or the energy storage module, so that the secondary DC bus can allocate and work electric energy, and the working reliability of the energy storage system is high. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0027] Figure 2 A structural schematic diagram of an all-in-one machine according to an embodiment of the present application.

[0028] Legend of reference signs

[0029] 100 - primary DC bus; 110 - power module; 120 - all-in-one machine; 1201 - shell; 1201a - sub-cavity; 1202 - base; 1203 - lifting ring; 1204 - cooling fan; 121 - photovoltaic module; 122 - charging module; 1221 - charging pile; 1222 - charging gun; 123 - energy storage module; 124 - secondary DC bus; 125 - slave control unit; 126 - DC load module; 127 - AC load module; 130 - master control unit; 140 - isolating switch; 150 - power master station; 200 - AC power grid. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0031] In the specific embodiments, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0032] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related aspects. It should be understood that the terms "upper", "lower", "outer", "inner" refer to the positions in the normal use state, and the terms "left" and "right" refer to the left and right directions shown in the specific schematic diagram, which can be the left and right directions in the normal use state or not.

[0033] It should be noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that includes the element. "Plural" means two or more.

[0034] The embodiment of the present application provides a kind of energy storage system.

[0035] Please refer to Figure 1 , energy storage system includes primary DC bus 100, power supply station 150 and integrated machine 120.

[0036] Power supply station 150 is the center for managing and coordinating different power supplies for energy storage system.

[0037] Power supply station 150 includes power module 110, one end of power module 110 is connected with one end of primary DC bus 100, and the other end is externally connected with AC power grid 200.

[0038] Integrated machine 120 internally integrates at least energy storage module 123, photovoltaic module 121 and charging module 122, integrated machine 120 includes secondary DC bus 124, the number of integrated machine 120 is at least one, energy storage module 123, photovoltaic module 121, charging module 122 are connected to one end of secondary DC bus 124, integrated machine 120 is connected with the other end of primary DC bus 100 through the other end of secondary DC bus 124.

[0039] AC power grid 200, also known as high-voltage AC power grid, refers to the power grid system for transmitting AC power. Primary DC bus 100 and secondary DC bus 124 are a kind of conductive equipment for transmitting and distributing DC power.

[0040] Specifically, power module 110 can convert AC power of AC power grid 200 into DC power and transmit to primary DC bus 100, and primary DC bus 100 can transmit and distribute DC power to each load device.

[0041] Photovoltaic module 121 is used for converting solar energy into electric energy.

[0042] Exemplarily, the photovoltaic module 121 can include a DC / DC converter, a low-voltage side of the DC / DC converter is connected to the photovoltaic power generation assembly, and a high-voltage side is connected to one end of the secondary direct-current bus 124 to transmit the converted electric energy to the secondary direct-current bus 124. Of course, in some embodiments, the photovoltaic module 121 can also receive electric energy from the secondary direct-current bus to realize energy interaction.

[0043] Here, the DC / DC converter of the photovoltaic module 121 can be a module with MPPT (Maximum Power Point Tracking) function to ensure that the photovoltaic power generation assembly always operates at its maximum power point, thereby converting available energy into electric energy as efficiently as possible.

[0044] The photovoltaic power generation assembly can include photovoltaic cells, packaging materials, and back plates. When sunlight shines on the photovoltaic cells, photons hit silicon atoms, release electrons, and form electric current.

[0045] The energy storage module 123 can serve as an energy storage unit. The electric energy stored by the energy storage module 123 can come from the electric energy transmitted from the primary direct-current bus 100 to the secondary direct-current bus 124, or from the electric energy transmitted from the photovoltaic module 121 to the secondary direct-current bus 124. The energy storage module 123 can also output electric energy to the secondary direct-current bus 124.

[0046] The charging module 122 can obtain electric energy from the secondary direct-current bus 124 to charge electric vehicles. Specifically, the charging module 122 can convert the voltage output by the secondary direct-current bus 124 into a suitable voltage, power, etc. according to the charging parameters of each electric vehicle, and then charge the electric vehicles. Here, the electric energy obtained by the charging module 122 from the secondary direct-current bus 124 can be the electric energy transmitted from the primary direct-current bus 100 to the secondary direct-current bus 124, or the electric energy transmitted from the photovoltaic module 121 to the secondary direct-current bus 124, or the electric energy output by the energy storage module 123 to the secondary direct-current bus 124.

[0047] The all-in-one machine 120 internally integrates at least the energy storage module 123, the photovoltaic module 121 and the charging module 122, that is, at least three functional modules are integrated in one all-in-one machine 120, the all-in-one machine 120 integrates the energy storage module 123, the photovoltaic module 121 and the charging module 122 and the like together, the energy storage module 123, the photovoltaic module 121 and the charging module 122 and the like are deeply fused in product form, one all-in-one machine 120 integrates multiple functions as a whole, the installation wiring is convenient, and each functional module does not need to be arranged separately and scattered, which is convenient for mutual cooperation of each module, centralized allocation of resources, and convenient use and later maintenance of customers. That is, the all-in-one machine 120 can work as an independent whole, and when the all-in-one machine 120 works, the electric energy is transmitted and distributed through the secondary DC bus 124.

[0048] At least one, which can be one or multiple. That is, the number of all-in-one machines 120 can be one or multiple. The electric energy distribution of each all-in-one machine 120 can be realized through the primary DC bus 100, the power module 110 provides DC power for the primary DC bus 100, the primary DC bus 100 distributes the DC power to each all-in-one machine 120 as needed, and the primary DC bus 100 uniformly controls and schedules to balance the working power of each all-in-one machine 120 and increase the power supply reliability.

[0049] The energy storage system provided by the embodiment of the present application integrates at least the energy storage module 123, the photovoltaic module 121 and the charging module 122 in the all-in-one machine 120, the all-in-one machine 120 integrates multiple modules together, reduces the complexity of scattered arrangement and independent running wiring of each module, realizes mutual cooperation of functions of each module through one whole, centralized allocation of resources, high compactness and high convenience. And, the working power of each all-in-one machine 120 is uniformly scheduled and distributed through the primary DC bus 100, reliable regulation is realized, the risk of overload in the load peak period is reduced, the power supply reliability is increased, the reasonable planning of the working power of multiple buildings is facilitated, when the primary DC bus 100 fails or is disconnected from the secondary DC bus 124, each all-in-one machine 120 can also transmit electric energy to the secondary DC bus 124 through the photovoltaic module 121 or the energy storage module 123, so that the secondary DC bus 124 can perform electric energy distribution and work, and the working reliability of the energy storage system is high.

[0050] In some embodiments, please refer to Figure 1The number of all-in-one machines 120 is multiple, the power supply central station 150 comprises a master control unit 130, each all-in-one machine 120 is internally integrated with a slave control unit 125, the master control unit 130 is in communication connection with the power module 110 and each slave control unit 125, the master control unit 130 is used for calculating and predicting the power demand of each all-in-one machine 120, and scheduling the power of each all-in-one machine 120 through the power module 110 and the first direct current bus 100, the slave control unit 125 is used for receiving the scheduling instruction of the master control unit 130, and calculating, predicting and scheduling the power demand of the photovoltaic module 121, the charging module 122 and the energy storage module 123.

[0051] Here, the master control unit 130 can calculate and predict the required power of each all-in-one machine 120 according to the number of accessed all-in-one machines 120, so as to determine the total power required to be provided by the power module 110 and the power distributed to each all-in-one machine 120, and the power module 110 is in communication connection with the power module 110, and the power of the power module 110 is transmitted to the second direct current bus 124 of each all-in-one machine 120 through the first direct current bus 100.

[0052] Here, the slave control unit 130 can calculate and predict the power demand of the photovoltaic module 121, the charging module 122 and the energy storage module 123 in each all-in-one machine 120, and transmit the power demand to the master control unit 130. For example, the slave control unit 130 controls the communication of the photovoltaic module 121, the charging module 122 and the energy storage module 123 through the bus, so as to facilitate the scheduling of the required power of the photovoltaic module 121, the charging module 122 and the energy storage module 123.

[0053] The master control unit 130 and the slave control unit 125 can be an EMS (Energy Management System, power management system), the master control unit 130 can calculate, predict and balance the total power of photovoltaic power generation, the total power of charging, the total power of battery adjustable power and electric quantity, the total power of direct current load, the total power of alternating current load and the like of all all-in-one machines 120, so that each all-in-one machine 120 obtains the power corresponding to the current power demand.

[0054] The slave control unit 125 can perform real-time calculation on the photovoltaic power generation power, charging power, battery adjustable power and electric quantity, direct current load power and alternating current load power in the all-in-one machine 120, and report the electric energy gap or electric energy surplus to the master control unit 130 in real time. The master control unit 130 schedules the electric energy power transmitted to the all-in-one machine 120 through the primary direct current bus 100, so that the energy storage module 123 and the charging module 122 obtain the electric energy adapted to the required electric energy. Of course, when the primary direct current bus 100 fails or the primary direct current bus 100 is disconnected from the secondary direct current bus 124, the slave control unit 125 can schedule and adjust the electric energy transmitted to the secondary direct current bus 124 by the energy storage module 123 or schedule and adjust the electric energy transmitted to the secondary direct current bus 124 by the photovoltaic module 121.

[0055] In this embodiment, through the setting of the master control unit 130 and the slave control unit 125, the electric energy power transmitted to each all-in-one machine 120 by the primary direct current bus 100 can be reasonably distributed to adapt to different power demands of different buildings and different power demands of different modules in the all-in-one machine 120, improve the energy utilization rate, realize flexible adjustment, and increase the power distribution reliability of the energy storage system.

[0056] Exemplarily, the master control unit 130 and the slave control unit 125 can be hardware control units based on ARM (Advanced RISC Machine, Advanced RISC Machine) core processors, which can process complex data and logic, and have rich peripheral resources, including short-range wireless communication, wireless 4G (fourth generation mobile communication technology), independent network segment network port, RS485 serial port, CAN interface (Controller Area Network, Controller Area Network interface) and the like. Ethernet communication is usually used between multiple control units, which has long communication distance, reliable communication and high speed.

[0057] In some embodiments, the number of all-in-one machines 120 is multiple, and each all-in-one machine 120 is connected to the other end of the primary direct current bus 100 through the other end of the secondary direct current bus 124.

[0058] Please refer to Figure 1 The energy storage system includes a disconnecting switch 140 connected between the other end of each secondary direct current bus 124 and the primary direct current bus 100. The disconnecting switch 140 is used to turn on or turn off the connection between the all-in-one machine 120 and the primary direct current bus 100.

[0059] In the embodiment, when unified scheduling through the primary direct current bus 100 is needed, the isolating switch 140 does not act, i.e., the isolating switch 140 turns on the connection between the all-in-one machine 120 and the primary direct current bus 100, when unified scheduling through the primary direct current bus 100 is not needed or the primary direct current bus 100 fails, the connection between the all-in-one machine 120 and the primary direct current bus 100 can be disconnected through the isolating switch 140, thereby facilitating independent operation of each all-in-one machine 120, each all-in-one machine 120 can realize scheduling of electric power among modules through the secondary direct current bus 124 without being affected by the power supply station 150 and the primary direct current bus 100, and the power distribution reliability of the energy storage system is increased.

[0060] In some embodiments, the working mode of the energy storage system includes a grid-connected mode and an off-grid mode, in the grid-connected mode, the power supply module 110 converts alternating current into direct current and transmits the direct current to the primary direct current bus 100 or inversely converts the direct current on the primary direct current bus 100 into alternating current to be connected to the alternating current grid 200, and the energy storage module 123 receives electric power, in the off-grid mode, the energy storage module 123 delivers direct current to the secondary direct current bus 124.

[0061] Here, grid-connected means that the power system is connected to the public grid and can receive power from the grid or feed excess power back to the grid. Off-grid means that the power system is not connected to the public grid and relies entirely on its own power generation equipment for power supply.

[0062] Exemplarily, the power supply module 110 can include a bidirectional AC / DC converter to realize bidirectional conversion of electric power, so that when the master control unit 130 receives the electric power shortage information from the slave control unit 125, the alternating current is converted into direct current and transmitted to the secondary direct current bus 124 through the primary direct current bus 100, thereby supplementing the electric power of the all-in-one machine 120, or when the master control unit 130 receives the electric power surplus information from the slave control unit 125, the surplus electric power of the all-in-one machine 120 is transmitted to the primary direct current bus 100 through the secondary direct current bus 124, and then transmitted to the power supply module 110, and the power supply module 110 inversely converts the surplus electric power into alternating current to be connected to the alternating current grid 200.

[0063] In this embodiment, in the grid-connected mode, the power module 110 converts the alternating current of the external alternating current grid 200 into direct current and transmits it to the primary direct current bus 100. Of course, the power module 110 can also invert the direct current of the primary direct current bus 100 into alternating current to be connected to the external alternating current grid 200. In the off-grid mode, the energy storage module 123 is used to deliver power to the secondary direct current bus 124. At this time, the secondary direct current bus 124 can be in a connected state with the primary direct current bus 100, or can be in a disconnected state with the primary direct current bus 100. In the connected state, the energy storage module 123 of one of the all-in-one machines 120 can provide power to the primary direct current bus 100, or the energy storage modules 123 of multiple all-in-one machines 120 can provide power to the primary direct current bus 100, so as to realize power allocation. In the disconnected state, the energy storage module 123 of each all-in-one machine 120 provides power to the all-in-one machine 120, and the all-in-one machine 120 realizes independent operation under the action of the energy storage module 123.

[0064] In this embodiment, the power module 110 only uses the grid-connected mode. When a fault occurs on the grid side and the primary direct current bus 100 cannot be maintained, the energy storage module 123 generates power and quickly supports it, thereby realizing the off-grid operation function. In this embodiment, the excess power or the lack of power at the load switching moment during grid connection is absorbed or supplemented by the grid, and the energy storage module 123 only charges and discharges when receiving dispatching, i.e., discharges in the off-grid mode and charges in the grid-connected mode, thereby reducing the phenomenon that repeated charging and discharging of the energy storage module 123 is needed to absorb the power gap or surplus during grid connection, which affects the service life of the energy storage module 123, and increasing the working reliability of the energy storage module 123.

[0065] In some embodiments, referring to Figure 1 and Figure 2 The all-in-one machine 120 further integrates a direct current load module 126. One end of the direct current load module 126 is connected to one end of the secondary direct current bus 124, and the other end is used to provide a direct current power output.

[0066] Direct current load refers to a device or system designed to work under constant current, i.e., the power flows from the positive electrode to the negative electrode without changing direction. Exemplarily, the direct current load can include LED lights, electronic devices, communication devices, etc.

[0067] In this embodiment, the direct current load module 126 provides a direct current power output for the direct current load, so as to increase the power supply flexibility of the all-in-one machine 120. Exemplarily, the direct current load module 126 includes a DC / DC converter. The high-voltage side of the DC / DC converter is connected to one end of the secondary direct current bus 124, and the low-voltage side is used to provide a direct current power output. The direct current power voltage level output by the direct current load module can be 48V (Volt).

[0068] In some embodiments, referring to Figure 1 and Figure 2 The all-in-one machine 120 further integrates an alternating current load module 127, one end of which is connected to one end of the secondary direct current bus 124, and the other end is used to provide alternating current power output.

[0069] An alternating current load refers to a device or system designed to work under a periodically changing direction 1 current. The alternating current load can include household appliances (such as refrigerators, washing machines, air conditioners, microwave ovens), electric motors, office equipment, etc.

[0070] In this embodiment, the alternating current load module 127 provides alternating current power output for the alternating current load, so as to increase the power supply flexibility of the all-in-one machine 120. Illustratively, the alternating current load module 127 includes a DC / AC inverter, the direct current side of which is connected to the secondary direct current bus 124, and the alternating current side provides alternating current power output. Illustratively, the alternating current power output of the alternating current load module can be 220V / 50Hz.

[0071] It can be understood that the direct current load module 126 and the alternating current load module 127 can be respectively connected to the slave control unit 125 through the bus communication, so as to calculate and allocate the required power through the slave control unit 125.

[0072] In some embodiments, the energy storage module 123 includes a bidirectional direct current power supply, an energy storage battery, and a battery management system, the bidirectional direct current power supply is connected to the secondary direct current bus 124 and the energy storage battery, and the battery management system is connected to the energy storage battery, for protecting the overcharging and overdischarging of the energy storage battery.

[0073] In this embodiment, the energy storage battery is used to store and output power, and the battery management system is used to intelligently manage and maintain the energy storage battery, monitor the use state of the energy storage battery, and perform safety monitoring and capacity calculation on the charging and discharging of the energy storage battery, so as to prevent the overcharging and overdischarging of the energy storage battery and prolong the service life of the energy storage battery.

[0074] The bidirectional direct current power supply, i.e., a bidirectional DC / DC converter, the energy storage battery is connected to the secondary direct current bus 124 through the bidirectional DC / DC converter, and the bidirectional DC / DC converter is used to realize the bidirectional conversion between the secondary direct current bus 124 and the energy storage voltage of the energy storage battery during the charging and discharging of the energy storage battery.

[0075] In some embodiments, the energy storage battery includes at least one of a carbon lead battery and a lithium iron phosphate battery.

[0076] The carbon lead battery has high safety performance and almost no self-ignition phenomenon, and the cost of the carbon lead battery is low, which facilitates reducing the overall use cost of the energy storage system.

[0077] The lithium iron phosphate battery is a lithium ion battery using lithium iron phosphate as a positive material, has good thermal stability and chemical stability, is not prone to thermal runaway under high temperature conditions, and can withstand more charge and discharge cycles without significantly reducing capacity, has a long cycle life, and contains no heavy metals or other harmful substances, has less impact on the environment.

[0078] The energy storage battery can be one of a carbon lead battery and a lithium iron phosphate battery, or can include both a carbon lead battery and a lithium iron phosphate battery, which is not limited herein.

[0079] In some embodiments, referring to Figure 1 The charging module 122 includes a charging pile 1221 and a charging gun 1222, the charging gun 1222 is electrically connected to the charging pile 1221, and the charging gun 1222 is used to access the electric vehicle to charge the electric vehicle.

[0080] The charging pile 1221 is used to obtain electrical energy from the secondary DC bus 124 side and convert the electrical energy into a form suitable for charging the electric vehicle through an internal circuit, and the charging gun 1222 refers to a hardware directly inserted into the charging interface of the electric vehicle. The charging gun 1222 can be electrically connected to the charging pile 1221 through a cable.

[0081] Exemplarily, the charging pile 1221 can be equipped with an intelligent control system, which can communicate with the electric vehicle when the charging gun 1222 is inserted into the electric vehicle, monitor the charging state, and adjust the output power as needed. Of course, the charging pile 1221 can also have a user interface, a payment system and other additional functions.

[0082] Exemplarily, the charging pile 1221 can include a bidirectional DC / DC converter, the high-voltage side of the bidirectional DC / DC converter is connected to the secondary DC bus 124, and the low-voltage side is connected to the electric vehicle through the charging gun 1222 to charge or discharge the electric vehicle.

[0083] In this embodiment, the cooperation of the charging pile 1221 and the charging gun 1222 can realize reliable charging or discharging of the electric vehicle, and increase the working reliability of the all-in-one machine 120.

[0084] In some embodiments, referring to Figure 2 The all-in-one machine 120 includes a housing 1201 and a base 1202, the energy storage module 123, the photovoltaic module 121, the charging module 122, the DC load module and the AC load module are arranged in the housing 1201, and the base 1202 is arranged at the bottom side of the housing 1201 to support the housing 1201.

[0085] In this embodiment, the shell 1201 and the base 1202 are provided, the shell 1201 provides accommodation space and protection for the energy storage module 123, the photovoltaic module 121, the charging module 122, the direct current load module 126 and the alternating current load module 127, and the base 1202 provides support for the shell 1201 and the energy storage module 123, the photovoltaic module 121, the charging module 122, the direct current load module 126 and the alternating current load module 127 arranged in the shell 1201, thereby increasing the overall structural reliability and integration of the all-in-one machine 120 and reducing the interference from external impurities.

[0086] In some embodiments, a plurality of sub-cavities 1201a are formed in the shell 1201, and the photovoltaic module 121, the charging module 122 and the energy storage module 123 are arranged in different sub-cavities 1201a. In this way, each module can have a certain installation space, reducing the probability of installation interference and increasing the layout rationality.

[0087] In the height direction of the all-in-one machine 120, the photovoltaic module 121, the charging module 122 and the energy storage module 123 are arranged in sequence from top to bottom. That is, the photovoltaic module 121 is arranged on the top side of the charging module 122, the charging module 122 is arranged on the top side of the energy storage module 123, and in this way, the photovoltaic module 121 can receive solar energy and convert it into electrical energy, the charging module 122 is arranged in the middle region to facilitate charging operation for electric vehicles, and the energy storage module 123 is arranged on the bottom side to reduce the overall center of gravity of the all-in-one machine 120 and reduce interference during charging and discharging, thereby increasing the layout rationality of the all-in-one machine 120.

[0088] In some embodiments, the charging pile 1221 is located in one of the sub-cavities 1201a, and the charging gun 1222 is located in another of the sub-cavities 1201a.

[0089] In this embodiment, the charging gun 1222 and the charging pile 1221 are located in different sub-cavities 1201a, which can reasonably distribute the charging gun 1222 and the charging pile 1221. After the charging gun 1222 is used, it can be placed in a certain position, reducing the probability of charging confusion caused by not knowing where to put the charging gun 1222 after charging is completed, and increasing the charging reliability.

[0090] In some embodiments, the charging pile 1221 and the charging gun 1222 are arranged side by side in a first direction, wherein the first direction is perpendicular to the height direction of the all-in-one machine 120. In this way, the charging pile 1221 and the charging gun 1222 can be connected, and the length of the wiring can be reduced.

[0091] In some embodiments, the direct current load module 126 and / or the alternating current load module 127 are arranged side by side with the energy storage module 123 in the first direction.

[0092] Here, the DC load module 126 and the energy storage module 123 can be arranged side by side along the first direction, or the AC load module 127 and the energy storage module 123 can be arranged side by side along the first direction, or the DC load module 126 and the AC load module 127 can be arranged side by side along the first direction, that is, the DC load module 126 and / or the AC load module 127 can be arranged in the same sub-cavity 1201a.

[0093] In this embodiment, the arrangement of the DC load module 126, the AC load module 127, and the energy storage module 123 can reduce the size of the all-in-one machine 120 in the height direction, and make the overall structure of the all-in-one machine 120 more stable and reliable.

[0094] In some embodiments, the DC load module 126 and / or the AC load module 127 and the slave control unit 125 are arranged side by side along the height direction of the all-in-one machine 120.

[0095] Here, the DC load module 126 and the slave control unit 125 can be arranged side by side along the height direction, or the AC load module 127 and the slave control unit 125 can be arranged side by side along the height direction, or the DC load module 126 and the AC load module 127 can be arranged side by side along the height direction, that is, the DC load module 126 and / or the AC load module 127 can be arranged in the same sub-cavity 1201a.

[0096] In this embodiment, the arrangement of the DC load module 126, the AC load module 127, and the slave control unit 125 can make the size of the all-in-one machine 120 along the first direction and the height direction more appropriate, and the overall center of gravity of the all-in-one machine 120 can be more reasonable, and the stability of the all-in-one machine 120 is high.

[0097] Exemplarily, the slave control unit 125, the charging gun 1222, the DC load module 126, and / or the AC load module 127 are arranged in the height direction of the all-in-one machine 120 from top to bottom.

[0098] In some embodiments, as shown in Figure 2 The top outer side of the shell 1201 is formed with at least one lifting ring 1203, so as to facilitate the installation, fixation, etc. of the all-in-one machine 120 through the lifting ring 1203, and increase the installation reliability of the all-in-one machine 120.

[0099] In some embodiments, as shown in Figure 2 The all-in-one machine 120 further includes a cooling fan 1204, which is used to communicate the space in the shell 1201 with the external environment.

[0100] In this embodiment, the negative pressure generated by the heat dissipation fan 1204 transmits the heat generated by the operation of each module in the shell 1201 to the external environment, so that the overall working temperature of the all-in-one machine 120 is within a suitable range, and the working reliability of the all-in-one machine 120 is increased.

[0101] In some embodiments, the communication connection mode between the master control unit 130 of the power supply central station 150 and the slave control unit 125 of the all-in-one machine 120 can include:

[0102] The slave control unit 125 of all the all-in-one machines 120 shakes hands with the master control unit 130.

[0103] If the handshake fails, the slave control unit 125 of all the all-in-one machines 120 is connected in communication, and if the communication connection is successful, it is determined that the master control unit 130 is faulty.

[0104] The slave control unit 125 of one of the all-in-one machines 120 is formed into a new master control unit, and the power demand of the other slave control units 125 is scheduled.

[0105] Here, the handshake refers to a series of initialization steps performed by both parties before starting data transmission, which is used to establish connection, confirm each other's identity, and negotiate communication parameters.

[0106] If the handshake fails, a communication failure occurs between the slave control unit 125 and the master control unit 130. In this case, if the communication connection between the slave control units 125 of all the all-in-one machines 120 is successful, it means that the slave control units 125 of each all-in-one machine 120 are not faulty, i.e. the master control unit 130 is faulty.

[0107] Of course, if one of the slave control units 125 fails to communicate, the slave control unit 125 is faulty.

[0108] If the master control unit 130 fails, a competition can be performed between the slave control units 125, one of the slave control units is set as a new master control unit, and communication connection and power scheduling of the remaining slave control units are realized.

[0109] In this embodiment, the master-slave relationship between the master control unit 130 and the slave control unit 125 is not constant, and when the master control unit 130 fails, one of the slave control units 125 can be set as a new master control unit to realize reliable regulation of the energy storage system.

[0110] It can be understood that in this case, the new master control unit is not in communication connection with the power supply module 110, and the power supply module spontaneously connects with the AC power grid 200 and transmits power to the first DC bus 100.

[0111] In the description of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0112] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An energy storage system, characterized by, The application relates to a power supply system, which comprises: a primary direct-current bus; a power supply station comprising a power supply module, one end of the power supply module being connected to one end of the primary direct-current bus, and the other end being externally connected to an alternating-current power grid; a one-body machine, which internally integrates at least an energy storage module, a photovoltaic module and a charging module, the one-body machine comprising a secondary direct-current bus, the number of the one-body machines being at least one, the energy storage module, the photovoltaic module and the charging module being respectively connected to one end of the secondary direct-current bus, and the one-body machine being connected to the other end of the primary direct-current bus through the other end of the secondary direct-current bus.

2. The energy storage system of claim 1, wherein, The number of the one-body machines is multiple, the power supply station comprises a master control unit, each one-body machine internally integrates a slave control unit, the master control unit is in communication connection with the power supply module and each slave control unit, the master control unit is used for calculating and predicting the power demand of each one-body machine, and the power of each one-body machine is dispatched through the power supply module and the primary direct-current bus, and the slave control unit is used for receiving the dispatching instruction of the master control unit and calculating, predicting and dispatching the power demand of the photovoltaic module, the charging module and the energy storage module.

3. The energy storage system of claim 1, wherein, The number of the one-body machines is multiple, and each one-body machine is connected to the other end of the primary direct-current bus through the other end of the secondary direct-current bus. The energy storage system comprises a disconnecting switch, which is connected between the other end of each secondary direct-current bus and the primary direct-current bus, and is used for turning on or off the connection between the one-body machine and the primary direct-current bus.

4. The energy storage system of claim 1, wherein, The working mode of the energy storage system comprises a grid-connected mode and an off-grid mode, in the grid-connected mode, the power supply module converts alternating current into direct current and transmits the direct current to the primary direct-current bus or inversely converts the direct current on the primary direct-current bus into alternating current to be connected to the alternating-current power grid, and the energy storage module receives power, in the off-grid mode, the energy storage module transmits direct current to the secondary direct-current bus.

5. The energy storage system of any one of claims 1-4, wherein, The one-body machine further internally integrates a direct-current load module, one end of the direct-current load module is connected to one end of the secondary direct-current bus, and the other end is used for providing direct-current power supply output; and / or, the one-body machine further internally integrates an alternating-current load module, one end of the alternating-current load module is connected to one end of the secondary direct-current bus, and the other end is used for providing alternating-current power supply output.

6. The energy storage system of claim 1, wherein, The energy storage module comprises a bidirectional direct-current power supply, an energy storage battery and a battery management system, the bidirectional direct-current power supply is connected to the secondary direct-current bus and the energy storage battery, the battery management system is connected to the energy storage battery and is used for protecting the energy storage battery from overcharging and overdischarging.

7. The energy storage system of claim 6, wherein, The energy storage battery comprises at least one of a carbon lead battery and a lithium iron phosphate battery.

8. The energy storage system of claim 1, wherein, The charging module comprises a charging pile and a charging gun, the charging pile is connected to the charging gun, and the charging gun is used for connecting to an electric vehicle to charge the electric vehicle.

9. The energy storage system of claim 5, wherein, The all-in-one machine comprises a shell and a base, the energy storage module, the photovoltaic module, the charging module, the direct current load module and the alternating current load module are arranged in the shell, and the base is arranged at the bottom side of the shell and used for supporting the shell.

10. The energy storage system of claim 9, wherein, A plurality of sub-cavities are formed in the shell, the photovoltaic module, the charging module, the energy storage module, the direct current load module and the alternating current load module are arranged in different sub-cavities, and the photovoltaic module, the charging module and the energy storage module are arranged in sequence from top to bottom along the height direction of the all-in-one machine.

11. The energy storage system of claim 10, wherein, The charging module comprises a charging pile and a charging gun, the charging pile is connected with the charging gun, the charging gun is used for connecting an electric vehicle to charge the electric vehicle, and the charging pile and the charging gun are arranged in different sub-cavities.

12. The energy storage system of claim 10, wherein, The direct current load module and / or the alternating current load module and the energy storage module are arranged side by side along a first direction, wherein the first direction is perpendicular to the height direction of the all-in-one machine. And / or, the all-in-one machine is internally integrated with a slave unit, the slave unit is used for calculating, predicting and scheduling the electrical energy demand of each module inside the all-in-one machine, and the direct current load module and / or the alternating current load module and the slave unit are arranged side by side along the height direction of the all-in-one machine.

13. The energy storage system of claim 9, wherein, At least one lifting ring is formed on the top outer side of the shell.

14. The energy storage system of claim 9, wherein, The all-in-one machine further comprises a cooling fan, and the cooling fan is used for communicating the space in the shell with the external environment.

Images