energy storage system

Abstract

This application provides an energy storage system, relating to the field of energy storage technology. The energy storage system includes: a battery box for storing electrical energy, comprising a first DC bus and a battery module, the first DC bus being electrically connected to the battery module; a bidirectional DC charging box comprising: a second DC bus and a bidirectional DC / DC conversion module, the first side for connecting a charging gun for connecting to an electric vehicle, and the second side being electrically connected to the second DC bus; a high-voltage electrical junction box comprising a busbar unit for electrically connecting the first and second DC buses; wherein the bidirectional DC charging box, the high-voltage electrical junction box, and the battery box are stacked; the bidirectional DC / DC conversion module converts the DC power output from the battery box to voltage after the charging gun is connected to the electric vehicle, and then charges the electric vehicle; and / or, converts the DC power output from the electric vehicle to voltage, and then charges the battery box. This application can effectively improve the energy utilization rate of the energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to an energy storage system. Background Technology

[0002] In related technologies, photovoltaic-storage-charging systems charge energy storage systems and electric vehicles when photovoltaic power generation is sufficient. When photovoltaic power generation is insufficient, the energy storage system is needed to supplement the electric vehicle's power. This architecture, when charging electric vehicles through the energy storage system, such as... Figure 3A As shown, the energy path is: energy storage battery - DC / DC module of energy storage inverter - DC / AC module of energy storage inverter - DC / AC module of V2G AC charging pile rectifier - DC / DC module of V2G AC charging pile rectifier - vehicle battery. It is evident that this process requires at least four levels of AC / DC or DC / DC conversion.

[0003] Each energy conversion at each level results in energy loss, which leads to low energy utilization of the energy storage system. Utility Model Content

[0004] This application aims to at least address the technical problem of low energy utilization rate in energy storage systems existing in the prior art or related technologies.

[0005] Therefore, this application proposes an energy storage system.

[0006] In some technical solutions of this application, an energy storage system is proposed, including:

[0007] A battery box is used to store electrical energy. The battery box includes a first DC bus and a battery module. The first DC bus is electrically connected to the battery module.

[0008] A bidirectional DC charging box includes: a second DC bus and a bidirectional DC / DC conversion module. The first side of the bidirectional DC / DC conversion module is used to connect a charging gun, which is used to connect to an electric vehicle. The second side of the bidirectional DC / DC conversion module is electrically connected to the second DC bus.

[0009] A high-voltage electrical junction box, comprising a busbar unit for electrically connecting a first DC bus and a second DC bus;

[0010] The bidirectional DC charging box, high-voltage electrical junction box, and battery box are stacked together.

[0011] The bidirectional DC / DC converter module is used to convert the DC power output from the battery box to the electric vehicle after the charging gun is connected to the electric vehicle, and then charge the electric vehicle; and / or, to convert the DC power output from the electric vehicle to the battery box.

[0012] In the energy storage system of this application, the battery module of the battery box and the bidirectional DC / DC conversion module of the bidirectional DC charging box are respectively connected to the current collection unit in the high-voltage electrical junction box through the DC bus. Therefore, the energy path from the battery module to the electric vehicle is shortened to battery module - bidirectional DC / DC conversion module - electric vehicle. That is, only one level of energy conversion is needed to realize the mutual charging of electric vehicle and battery module, which effectively reduces the number of energy conversion levels and thus reduces the energy loss caused by energy conversion, and can effectively improve the energy utilization rate of the energy storage system.

[0013] Optionally, in some technical solutions of this application, the high-voltage electrical junction box is located between the battery box and the bidirectional DC charging box.

[0014] This application separates the bidirectional DC charging box and the battery box by using a high-voltage electrical box, which can prevent the heat generated by the power devices in the bidirectional DC charging box from being directly transferred to the battery box, thereby reducing the risk of high temperature in the battery box and improving system safety.

[0015] In some technical solutions of this application, optionally, the bidirectional DC charging box is located at the top of the high-voltage electrical junction box, and the battery box is located at the bottom of the high-voltage electrical junction box.

[0016] This application places the bidirectional DC charging box on top of the high-voltage electrical junction box, eliminating the need for users to bend over when picking up or placing the charging gun, thus making the energy storage system's structural design more rational. Furthermore, placing the heavier battery box at a lower position improves the installation stability of the energy storage system.

[0017] Optionally, in some technical solutions of this application, the high-voltage electrical junction box may further include an energy management module, which is communicatively connected to the bidirectional DC charging box and the battery box.

[0018] This application sets up an energy management module to uniformly manage the signal communication between the bidirectional DC charging box and the battery box, which can effectively optimize the control data link of the energy storage system and realize bidirectional mutual charging between the battery module and the electric vehicle.

[0019] Optionally, in some technical solutions of this application, the high-voltage electrical junction box further includes: a first acquisition module, which is electrically connected to the combiner unit and communicatively connected to the energy management module. The first acquisition module is used to acquire current and voltage information of electrical signals flowing through the combiner unit and transmit them to the energy management module.

[0020] This application sets up a first acquisition module in the high-voltage electrical junction box. The first acquisition module acquires the current and voltage information on the busbar unit. This current and voltage information simultaneously represents the voltage and current of the output electrical signal of the battery box, and can also characterize the voltage and current of the input electrical signal of the bidirectional DC / DC conversion module. Therefore, by acquiring the electrical signal characteristics at this location, closed-loop control of the mutual charging signal between the electric vehicle and the battery module can be realized, thereby improving the management efficiency of energy conversion.

[0021] Optionally, in some technical solutions of this application, the energy storage system may further include: an energy storage inverter, which is communicatively connected to the energy management module, and the energy storage inverter includes a third DC bus, which is electrically connected to the first DC bus and the second DC bus through a combiner unit.

[0022] The energy storage system of this application communicates with the energy storage inverter through the energy management module of the high-voltage electrical junction box, and is compatible with various specifications of energy storage inverters. The inverter, through a third DC bus, combines energy with the battery box and the bidirectional DC charging box on the combiner unit, and can realize the electrical connection between the battery box and the bidirectional DC charging box through a power interface of the inverter.

[0023] In some technical solutions of this application, optionally, the energy storage inverter is used to connect to the power grid, and the energy storage inverter is used to convert the AC power output from the power grid into DC power to charge the battery box, or to convert the AC power output from the power grid into DC power and then charge the electric vehicle through the bidirectional DC charging box.

[0024] The energy storage inverter is also used to connect AC loads. It can convert DC power in the battery box into AC power to supply AC loads, or receive DC power from the electric vehicle from the bidirectional DC charging box, convert it into AC power, and then supply AC loads.

[0025] The energy storage inverter of this application can achieve bidirectional conversion between AC and DC signals. By setting up the energy storage inverter, it is possible to draw power from the grid to charge the battery module, draw power from the grid to charge the electric vehicle, sell electricity to the grid using the electrical energy stored in the electric vehicle or battery module, and supply power to the AC load of the terminal using the electrical energy stored in the electric vehicle or battery module. This effectively expands the application scenarios of the energy storage system and realizes multi-functional integration.

[0026] Optionally, in some technical solutions of this application, the high-voltage electrical junction box may also include a communication interface, and the battery box, bidirectional DC charging box, energy management module and energy storage inverter are all connected to each other through the communication interface.

[0027] This application enables data exchange and unified control management among electric vehicles, bidirectional DC charging boxes, high-voltage electrical junction boxes, and energy storage inverters by setting up a unified communication interface, thereby improving the command communication efficiency of various components in the energy storage system.

[0028] Optionally, in some technical solutions of this application, the energy storage inverter may further include: a photovoltaic connection port for connecting a photovoltaic panel; a DC converter, the first side of which is electrically connected to the photovoltaic connection port, the second side of which is electrically connected to a third DC bus, and the DC converter for charging the battery box with DC power output from the photovoltaic panel or charging the electric vehicle with a bidirectional DC charging box.

[0029] The energy storage inverter of this application can be electrically connected to a photovoltaic panel through a photovoltaic connection port, and can charge an electric vehicle or battery box with the electrical energy generated by the photovoltaic panel by setting a DC converter, thereby realizing the integration of photovoltaic power generation, energy storage and charging functions.

[0030] Optionally, in some technical solutions of this application, the bidirectional DC charging box further includes: a controller; a second acquisition module, which is communicatively connected to the controller and used to acquire the charging and discharging voltage of the electric vehicle; and a voltage regulation module, which includes a relay circuit, the relay circuit including multiple switching states, each switching state corresponding to a preset voltage range; wherein, the controller is used to adjust the switching state of the relay circuit according to the comparison result between the charging and discharging voltage of the electric vehicle and the preset voltage range.

[0031] This application integrates a controller and a second acquisition module into a bidirectional DC charging box to acquire the charging and discharging voltage of an electric vehicle. Based on the charging and discharging voltage of the electric vehicle, the switching state of the relay circuit is adjusted, enabling the energy storage system to have a wider range of input and output voltages, thus making it suitable for more application scenarios.

[0032] In some technical solutions of this application, optionally, the number of battery boxes is at least one; at least one battery box is connected in series through a first DC bus.

[0033] This application reduces the energy conversion levels and improves the energy utilization rate of the energy storage system by connecting multiple battery boxes in series through a first DC bus and then combining them with a bidirectional DC charging box and an energy storage inverter through a combiner unit.

[0034] Optionally, in some technical solutions of this application, the energy storage system may also include: a base located at the bottom of the energy storage system for fixing the bidirectional DC charging box, high-voltage electrical junction box and battery box after stacking.

[0035] This application provides a base at the bottom of the energy storage system that supports multiple battery boxes, high-voltage electrical junction boxes, and bidirectional DC charging boxes. This base provides safety protection for the bottom ports of the battery boxes and enables the entire energy storage system to be grounded, thereby improving the stability of the energy storage system.

[0036] Optionally, in some technical solutions of this application, the bidirectional DC charging box further includes a heat dissipation module for dissipating heat from the bidirectional DC / DC conversion module.

[0037] This application incorporates an active heat dissipation module in the bidirectional DC charging box. This module reduces the heat generated by the bidirectional DC / DC converter during operation, preventing overheating damage or shutdown of the bidirectional DC / DC converter and improving the safety and stability of the energy storage system.

[0038] In some technical solutions of this application, the bidirectional DC charging box, the high-voltage electrical junction box and the battery box can optionally be stacked together using blind-fit terminals.

[0039] This application provides blind-plug terminals at the top and bottom of the bidirectional DC charging box, high-voltage electrical junction box, and battery box, thereby reducing the difficulty of splicing and installing various components in the energy storage system. Attached Figure Description

[0040] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0041] Figure 1 The present application shows schematic diagrams of the structure of energy storage systems according to some embodiments;

[0042] Figure 2 A schematic diagram of the structure of a bidirectional DC charging box according to some embodiments of this application is shown;

[0043] Figure 3A A schematic diagram of the system architecture of an energy storage system in the prior art is shown;

[0044] Figure 3B The following are schematic diagrams illustrating the system architecture of energy storage systems according to some embodiments of this application;

[0045] Figure 4 Circuit diagrams of relay circuits for voltage regulation modules according to some embodiments of this application are shown;

[0046] Figure 5 The following are schematic diagrams illustrating the system architecture of energy storage systems according to some embodiments of this application;

[0047] Figure 6 The present application shows schematic diagrams of the structure of energy storage systems according to some embodiments;

[0048] Figure 7 A schematic diagram of the structure of an energy storage system according to some embodiments of this application is shown.

[0049] Figure label:

[0050] 100 Energy storage system, 102 Battery box, 1022 First DC bus, 1024 Battery module, 103 Bidirectional DC charging box, 1031 Second DC bus, 1032 Bidirectional DC / DC conversion module, 1033 Controller, 1034 Second acquisition module, 1035 Voltage regulation module, 1036 Heat dissipation module, 104 Combiner unit, 105 High-voltage electrical junction box, 1052 Energy management module, 1054 First acquisition module, 1056 Communication interface, 106 Energy storage inverter, 1062 Third DC bus, 1066 Photovoltaic connection port, 1068 DC converter, 107 Charging gun, 108 Base. Detailed Implementation

[0051] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0052] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0053] The following reference Figures 1 to 7 This application describes an energy storage system proposed according to some embodiments.

[0054] in, Figure 1 , Figure 2 , Figure 3A and Figure 3B In this context, "Power" indicates power supply, "BMU" (Battery Module Unit) is the battery cell management unit, "IVU" (Integrated Voltage Unit) is the second acquisition unit, "PLC" (Programmable Logic Controller) is the programmable logic controller, "BAT DC" is the DC bus of the battery box, "BATCOM" is the communication line of the battery box, "MPPT" (Maximum Power Point Tracking) is the maximum power point tracking module, and "BCU" (Battery Control Unit) is the controller.

[0055] In some embodiments of this application, an energy storage system is proposed. Figure 1 , Figure 6 and Figure 7 The present application shows schematic diagrams of the structure of energy storage systems according to some embodiments. Figure 2 The following are schematic diagrams of the bidirectional DC charging box according to some embodiments of this application, such as... Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the energy storage system 100 includes:

[0056] Battery box 102 is used to store electrical energy. Battery box 102 includes a first DC bus 1022 and a battery module 1024. The first DC bus 1022 is electrically connected to the battery module 1024.

[0057] The bidirectional DC charging box 103 includes: a second DC bus 1031 and a bidirectional DC / DC conversion module 1032. The first side of the bidirectional DC / DC conversion module 1032 is used to connect to the charging gun 107, which is used to connect to the electric vehicle. The second side of the bidirectional DC / DC conversion module 1032 is electrically connected to the second DC bus 1031.

[0058] The high-voltage electrical junction box 105 includes a busbar unit 104, which is used to electrically connect the first DC bus 1022 and the second DC bus 1031.

[0059] The bidirectional DC charging box 103, the high-voltage electrical junction box 105, and the battery box 102 are stacked together.

[0060] The bidirectional DC / DC converter module 1032 is used to convert the DC power output from the battery box 102 into voltage and charge the electric vehicle after the charging gun 107 is connected to the electric vehicle; and / or to convert the DC power output from the electric vehicle into voltage and charge the battery box 102.

[0061] In this embodiment, the energy storage system 100 includes a battery box 102, a bidirectional DC charging box 103, and a high-voltage electrical junction box 105. The number of battery boxes 102 can be one or more. Each battery box 102 houses a battery module 1024 and a first DC bus 1022. The battery module 1024 stores electrical energy. The battery module 1024 outputs or receives electrical energy through the first DC bus 1022, thereby achieving external discharge or charging.

[0062] In related technologies, one example is the scenario of charging electric vehicles through the batteries of energy storage devices. Figure 3A A schematic diagram of the system architecture of an energy storage system in the prior art is shown, such as... Figure 3AAs shown, the energy conversion path from the energy storage device's battery to the electric vehicle's battery includes: DC / DC module of the energy storage inverter - DC / AC module of the energy storage inverter - DC / AC module of the V2G AC charging pile rectifier - DC / DC module of the V2G AC charging pile rectifier. Among these, the DC / AC module has higher losses, while the DC / DC module has lower failure rates. Assuming the energy transfer efficiency of the DC / AC module is 97% and that of the DC / DC module is 98%, after four stages of energy transfer, the energy transfer efficiency is reduced to 98% × 97% × 97% × 98% = 90%. Whether the energy storage device charges the electric vehicle or the electric vehicle charges the energy storage device, the energy loss rate will be high.

[0063] To address the problems existing in the prior art, this application redesigns and optimizes the architecture of the charging system, decoupling and re-integrating the structure of the energy storage system + independent V2G charging pile in the relevant technology to form a brand-new integrated energy storage system, namely the system architecture in which the bidirectional DC charging box 103, high-voltage electrical junction box 105 and battery box 102 are stacked. At the same time, this system architecture is compatible with separate independent inverters. This new architecture can meet the high-efficiency charging scenarios of electric vehicles without sacrificing the traditional household electricity demand of the energy storage system.

[0064] For example, the bidirectional DC charging box 103 includes a charging gun 107, which can be connected to an electric vehicle. When the charging gun 107 is electrically connected to the electric vehicle, the bidirectional DC charging box 103 can realize bidirectional mutual charging between the electric vehicle and the battery box 102. For example, the bidirectional DC charging box 103 is provided with a bidirectional DC / DC conversion module 1032, which can convert the received DC signal into voltage and output a DC signal with a corresponding voltage value.

[0065] A combiner unit 104 is provided between the high-voltage electrical junction boxes 105. The first DC bus 1022 is electrically connected to the combiner unit 104. Providing a high-voltage electrical junction box to combine the energy lines in the energy storage system 100 helps to optimize the wiring between the battery box 102 and the bidirectional DC charging box 103, reducing wiring costs.

[0066] The bidirectional DC charging box 103 also includes a second DC bus 1031. The first side of the bidirectional DC / DC conversion module 1032 is electrically connected to the charging gun 107, and the second side of the bidirectional DC / DC conversion module 1032 is electrically connected to the second DC bus 1031. The second DC bus 1031 and the first DC bus 1022, i.e., the battery box 102, are connected via a busbar unit 104. Exemplarily, the busbar unit 104 is a bus terminal block.

[0067] Since the battery box 102 and the bidirectional DC / DC converter module 1032 are directly connected via the bus unit 104, the DC signal output from the battery box 102 only needs to undergo one energy conversion by the bidirectional DC / DC converter module 1032 to output energy to the electric vehicle. Similarly, the DC signal output from the electric vehicle also only needs to undergo one energy conversion by the bidirectional DC / DC converter module 1032 to output energy to the battery box 102. This effectively reduces the energy conversion layers between the battery box 102 and the electric vehicle, reduces the number of energy conversions, and thus reduces energy loss caused by energy conversion, thereby improving energy utilization efficiency.

[0068] For example, a user is charging an electric vehicle. At this time, the battery module 1024 in the battery box 102 outputs electrical energy. The electrical energy output by the battery module 1024 is output to the combiner unit 104 through the first DC bus 1022, and then output to the second side of the bidirectional DC / DC converter module 1032 through the electrical connection between the combiner unit 104 and the second DC bus 1031. The bidirectional DC / DC converter module 1032 regulates the DC signal output by the battery box 102 to the corresponding charging voltage for the electric vehicle, and then outputs it to the charging gun 107 through the first side of the bidirectional DC / DC converter module 1032, ultimately charging the electric vehicle through the charging gun 107. Only one energy conversion by the bidirectional DC / DC converter module 1032 is performed in this process.

[0069] For example, a user charges the battery box 102 using the remaining electrical energy in the electric vehicle. At this time, the electric vehicle outputs a DC signal. This DC signal is output through the charging gun 107 to the first side of the bidirectional DC / DC converter module 1032. The bidirectional DC / DC converter module 1032 regulates the voltage of the DC signal output by the electric vehicle, adjusting it to the charging voltage corresponding to the battery module 1024, and then outputs it through the second side of the bidirectional DC / DC converter module 1032. The DC signal output from the second side of the bidirectional DC / DC converter module 1032 is output to the combiner unit 104 through the first DC bus 1022, and then output to the battery box 102 for charging through the electrical connection between the combiner unit 104 and the second DC bus 1031. In this process, only one energy conversion occurs.

[0070] For example, the bidirectional DC charging box 103 can have multiple charging guns 107, and the corresponding bidirectional DC / DC conversion modules 1032 can also be multiple. Multiple charging guns 107 can be connected to different electric vehicles to charge them. For example, the bidirectional DC charging box 103 has two charging guns 107, connected to electric vehicle A and electric vehicle B respectively. When electric vehicle A selects charging mode, the bidirectional DC / DC conversion module 1032 electrically connected to electric vehicle A charges electric vehicle A using the electrical energy stored in the battery box 102. When electric vehicle B selects discharging mode, the bidirectional DC / DC conversion module 1032 electrically connected to electric vehicle B charges the battery box 102 using the electrical energy output from electric vehicle B.

[0071] In the energy storage system 100 of this application, the battery module 1024 of the battery box 102 and the bidirectional DC / DC conversion module of the bidirectional DC charging box 103 are respectively connected to the combiner unit 104 in the high-voltage electrical junction box 105 through the DC bus. Therefore, the energy path from the battery module 1024 to the electric vehicle is shortened to battery module 1024-bidirectional DC / DC conversion module 1032-electric vehicle. That is, only one level of energy conversion is needed to realize the mutual charging of electric vehicle and battery module 1024, which effectively reduces the number of energy conversion levels and thus reduces the energy loss caused by energy conversion, thereby effectively improving the energy utilization rate of energy storage system 100.

[0072] In some embodiments of this application, optionally, such as Figure 1 , Figure 6 and Figure 7 As shown, the high-voltage electrical junction box 105 is located between the battery box 102 and the bidirectional DC charging box 103.

[0073] In this embodiment, the bidirectional DC charging box 103 is equipped with a bidirectional DC / DC conversion module 1032. The DC / DC conversion module includes power devices such as charge / discharge MOSFETs, which generate a significant amount of heat during operation. The battery module 1024 in the battery box 102 is highly temperature-sensitive; its charging and discharging efficiency will only be at a high level when its operating temperature is within a suitable range.

[0074] Since no power devices are installed in the high-voltage electrical junction box 105, it generates less heat during operation and is less affected by temperature. Therefore, by using the high-voltage electrical junction box 105 to separate the bidirectional DC charging box 103 from the battery box 102, the heat generated by the power devices in the bidirectional DC charging box 103 can be prevented from being directly transferred to the battery box 102, thereby reducing the risk of high temperature in the battery box 102 and improving system safety.

[0075] In some embodiments of this application, optionally, such as Figure 1 As shown, the bidirectional DC charging box 103 is located on top of the high-voltage electrical junction box 105, and the battery box 102 is located at the bottom of the high-voltage electrical junction box 105.

[0076] In the embodiments of this application, in Figure 1 As shown in the top-to-bottom direction, the bidirectional DC charging box 103 is located at the top of the high-voltage electrical junction box 105, and the battery box 102 is located at the bottom of the high-voltage electrical junction box 105. Since the high-voltage electrical junction box 105 needs to be electrically connected to both the bidirectional DC charging box 103 and the battery box 102, placing the high-voltage electrical junction box 105 between the bidirectional DC charging box 103 and the battery box 102 helps reduce cable length during electrical wiring. Simultaneously, since the charging gun 107 is electrically connected to the bidirectional DC charging box 103, and the user needs to pick up or place the charging gun 107, placing the bidirectional DC charging box 103 at the top of the high-voltage electrical junction box 105 makes it more convenient for the user to pick up or place the charging gun 107, thus optimizing ergonomic design.

[0077] Meanwhile, since the battery module 1024 in the battery box 102 is relatively heavy, placing the heavier battery box 102 at the bottom of the high-voltage electrical junction box 105 is beneficial to improving the overall installation stability of the energy storage system 100 and avoiding the problem of "top-heavy".

[0078] This application places the bidirectional DC charging box 103 on top of the high-voltage electrical junction box 105, eliminating the need for users to bend over when picking up or placing the charging gun 107, thus making the structural design of the energy storage system 100 more reasonable. Furthermore, placing the heavier battery box 102 at a lower position improves the installation stability of the energy storage system 100.

[0079] In some embodiments of this application, optionally, such as Figure 1 As shown, the high-voltage electrical junction box 105 also includes an energy management module 1052, which is communicatively connected to the bidirectional DC charging box 103 and the battery box 102.

[0080] In this embodiment, an energy management module 1052 is provided in the high-voltage electrical junction box 105, and an energy management system (EMS) is integrated in the energy management module 1052. The energy management system can be regarded as the brain of the energy storage system 100, which is responsible for controlling the overall charging and discharging process of the energy storage system 100.

[0081] For example, the energy management module 1052 integrates communication protocols for inverters of different specifications and models. By setting up the energy management system, compatibility with different inverters can be achieved, thereby improving the compatibility of the energy storage system 100.

[0082] The energy management module 1052 is communicatively connected to both the bidirectional DC charging box 103 and the battery box 102. It manages the charging and discharging processes of the battery module 1024 in the battery box 102 and the operation of the bidirectional DC charging box 103. For example, the energy management module 1052 can also communicate with electric vehicles of different brands and using different signals via the charging gun 107 of the bidirectional DC charging box 103, thereby establishing charging and discharging protocols with the electric vehicles and enabling bidirectional charging control—either charging the electric vehicle through the battery box 102 or charging the battery box 102 through the electric vehicle.

[0083] This application sets up an energy management module 1052 to uniformly manage the signal communication between the bidirectional DC charging box 103 and the battery box 102, which can effectively optimize the control data link of the energy storage system 100 and realize bidirectional mutual charging between the battery module 1024 and the electric vehicle.

[0084] In some embodiments of this application, optionally, such as Figure 1 As shown, the high-voltage electrical junction box 105 also includes: a first acquisition module 1054, which is electrically connected to the combiner unit 104 and communicatively connected to the energy management module 1052. The first acquisition module 1054 is used to acquire the current and voltage information of the electrical signal flowing through the combiner unit 104 and transmit it to the energy management module 1052.

[0085] In this embodiment, a first acquisition module 1054 is provided in the high-voltage electrical junction box 105. This first acquisition module 1054 can acquire the current and voltage information of the DC signal flowing through the combiner unit 104. This current and voltage information simultaneously represents the voltage and current of the output electrical signal of the battery box 102, and can also characterize the voltage and current of the input electrical signal of the bidirectional DC / DC conversion module. Therefore, by acquiring the electrical signal characteristics at this location, closed-loop control of the mutual charging signal between the electric vehicle and the battery module 1024 can be achieved.

[0086] This application sets a first acquisition module 1054 in the high-voltage electrical junction box 105 to acquire current and voltage information on the combiner unit 104, thereby improving the management efficiency of energy conversion.

[0087] In some embodiments of this application, optionally, such as Figure 1 As shown, the energy storage system 100 also includes an energy storage inverter 106, which is communicatively connected to the energy management module 1052. The energy storage inverter 106 includes a third DC bus 1062, which is electrically connected to the first DC bus 1022 and the second DC bus 1031 through a combiner unit 104.

[0088] In this embodiment, an energy management module 1052 is provided in the high-voltage electrical box, and the energy management module 1052 integrates the communication protocols of inverters of different models and specifications. Therefore, the energy storage system 100 of this application can be compatible with a variety of energy storage inverters 106 of different models and specifications.

[0089] The energy storage inverter 106 includes a third DC bus 1062, which is connected to the single power interface of the energy storage inverter 106. The third DC bus 1062 is electrically connected to the combiner unit 104 in the high-voltage electrical junction box 105, allowing the energy storage inverter 106, the bidirectional DC charging box 103, and the battery box 102 to achieve unified current convergence through the combiner unit 104. This enables the bidirectional DC charging box 103 and the battery box 102 to be connected to the same power interface of the energy storage inverter 106 through the combiner unit 104. This makes the energy storage system compatible with an energy storage inverter 106 that has only one power interface.

[0090] The energy storage system 100 of this application is communicatively connected to the energy storage inverter 106 via the energy management module 1052 of the high-voltage electrical junction box 105, and is compatible with various specifications of energy storage inverters 106. The inverter, through the third DC bus 1062, combines energy with the battery box 102 and the bidirectional DC charging box 103 on the combiner unit 104, which can realize the electrical connection between the battery box 102 and the bidirectional DC charging box 103 through a power interface of the inverter.

[0091] In some embodiments of this application, optionally, Figure 3B The following are schematic diagrams illustrating the system architecture of an energy storage system 100 according to some embodiments of this application, such as... Figure 3B As shown, the energy storage inverter 106 is used to connect to the power grid. The energy storage inverter 106 is used to convert the AC power output from the power grid into DC power to charge the battery box 102, or to convert the AC power output from the power grid into DC power and then charge the electric vehicle through the bidirectional DC charging box 103.

[0092] The energy storage inverter 106 is also used to connect to AC loads. The energy storage inverter 106 is used to invert the DC power in the battery box 102 into AC power and then supply power to the AC load, or to receive DC power from the electric vehicle from the bidirectional DC charging box 103 and then invert it into AC power and then supply power to the AC load.

[0093] In the embodiments of this application, such as Figure 3B As shown, the energy storage inverter 106 can be connected to the power grid. The energy storage inverter 106 includes an inverter and a DC-DC conversion unit. The energy storage inverter 106 has multiple operating modes. For example, the energy storage inverter 106 has an electric vehicle charging mode. In this mode, the energy storage inverter 106 receives an AC signal output from the power grid and rectifies the AC signal to obtain a corresponding DC signal. This DC signal is output to the bidirectional DC charging box 103, which charges the electric vehicle through the bidirectional DC / DC conversion module 1032 within the bidirectional DC charging box 103.

[0094] For example, the energy storage inverter 106 also has a battery box 102 charging mode. In this mode, the energy storage inverter 106 receives the AC signal output from the grid and rectifies the AC signal to obtain a corresponding DC signal to charge the battery box 102.

[0095] For example, the energy storage inverter 106 also has a grid-connected electricity sales mode. In this mode, the energy storage inverter 106 receives the DC signal output by the electric vehicle or the battery box 102, performs inversion processing on the DC signal to obtain the corresponding AC signal, and outputs the AC signal to the grid to realize grid-connected electricity sales.

[0096] The energy storage inverter 106 can also be electrically connected to an AC load to supply power to the AC load. Exemplarily, the AC load includes, but is not limited to, lights, motors, and household appliances. The energy storage inverter 106 can invert the DC signal output from the battery box 102 to obtain an AC signal of 110V, 220V, 380V, or other voltage values, and supply power to the AC load through this AC signal to drive the AC load to operate.

[0097] The energy storage inverter 106 can also receive the DC signal output by the electric vehicle through the bidirectional DC charging box 103. The DC signal output by the electric vehicle is output to the energy storage inverter 106 through the bidirectional DC charging box 103. The energy storage inverter 106 inverts the DC signal to obtain an AC signal with a voltage value of 110V, 220V, 380V or other values, and supplies power to the AC load through the AC signal, thereby driving the AC load to work.

[0098] The energy storage inverter 106 of this application can realize bidirectional conversion between AC and DC signals. By setting the energy storage inverter 106, it is possible to draw power from the grid to charge the battery module 1024, draw power from the grid to charge electric vehicles, sell electricity to the grid through the electric vehicle or the battery module 1024, and supply AC loads to the terminal through the electric vehicle or the battery module 1024. This effectively expands the application scenarios of the energy storage system 100 and realizes multi-functional integration.

[0099] In some embodiments of this application, the high-voltage electrical junction box 105 may optionally include a communication interface 1056, through which the battery box 102, bidirectional DC charging box 103, energy management module 1052 and energy storage inverter 106 are all connected for communication.

[0100] In this embodiment of the application, a communication interface 1056 is provided on the high-voltage electrical junction box 105. Exemplarily, the communication interface 1056 includes, but is not limited to, a Bluetooth communication interface, a Wi-Fi communication interface, an I2C bus (Inter-Integrated Circuit) communication interface, a USB (Universal Serial Bus) communication interface, and a CAN (Controller Area Network) communication interface.

[0101] The communication between the electric vehicle and the bidirectional DC charging box 103 includes charging / discharging commands, charging current, and charging voltage. The communication between the bidirectional DC charging box 103 and the high-voltage electrical junction box 105 includes the electric vehicle's battery status and charging / discharging requirements. The communication between the high-voltage electrical junction box 105 and the energy storage inverter 106 includes charging / discharging commands from both the electric vehicle and the battery box 102.

[0102] This application enables data exchange and unified control management among electric vehicles, bidirectional DC charging boxes 103, high-voltage electrical junction boxes 105, and energy storage inverters 106 by setting up a unified communication interface 1056, thereby improving the command communication efficiency of various components in the energy storage system 100.

[0103] In some embodiments of this application, optionally, such as Figure 3BAs shown, the energy storage inverter 106 also includes: a photovoltaic connection port 1066 for connecting a photovoltaic panel; and a DC-DC converter 1068, the first side of which is electrically connected to the photovoltaic connection port 1066, the second side of which is electrically connected to the third DC bus 1062, and the DC-DC converter 1068 for charging the battery box 102 with DC power output from the photovoltaic panel or charging the electric vehicle with the bidirectional DC charging box 103.

[0104] In this embodiment, the energy storage inverter 106 is electrically connected to a photovoltaic panel, such as a photovoltaic panel, via a photovoltaic connection port 1066. The energy storage inverter 106 also includes a DC-DC converter 1068. A first side of the DC-DC converter 1068 is electrically connected to the photovoltaic connection port 1066 for receiving DC signals output from the photovoltaic panel. A second side of the DC-DC converter 1068 is electrically connected to a third DC bus 1062 and, through the third DC bus 1062 and the combiner unit 104, outputs DC signals to the bidirectional DC charging box 103.

[0105] The photovoltaic panel converts solar radiation into electrical energy and outputs it. The energy storage inverter 106 receives the DC signal output from the photovoltaic panel through the photovoltaic connection port 1066, and adjusts the voltage value of the DC signal output from the photovoltaic panel through the DC converter 1068, so that the voltage value of this DC signal meets the input voltage range of the bidirectional DC / DC conversion module 1032, or meets the voltage range for charging the battery box 102.

[0106] The energy storage inverter 106 has multiple operating modes. In the mode of charging electric vehicles via photovoltaic power generation, the inverter 106 receives a DC signal from the photovoltaic panel and outputs a converted DC signal from the second side of the DC-DC converter 1068. This signal sequentially passes through the third DC bus 1062, the combiner unit 104, and the second DC bus 1031, before being transmitted to the bidirectional DC charging box 103. The electric vehicle is then charged via the charging gun 107 of the bidirectional DC charging box 103.

[0107] When the energy storage inverter 106 operates in the mode of charging the battery box 102 through photovoltaic power generation, the energy storage inverter 106 receives a DC signal from the photovoltaic panel. After adjusting the voltage value of the DC signal to the charging voltage of the battery module 1024 through the DC converter 1068, the converted DC signal is output from the second side of the DC converter 1068. This signal passes sequentially through the third DC bus 1062, the combiner unit 104, and the first DC bus 1022, and is transmitted to the battery box 102, thereby charging the battery box 102.

[0108] The energy storage inverter 106 of this application can be electrically connected to the photovoltaic panel through the photovoltaic connection port 1066, and can charge the electric power generated by the photovoltaic panel to the electric vehicle or the battery box 102 by setting up a DC converter 1068, thereby realizing the integration of photovoltaic power generation, energy storage and charging functions.

[0109] In some embodiments of this application, optionally, Figure 4 The following are circuit diagrams of the relay circuit of the voltage regulating module 1035 according to some embodiments of this application, such as... Figure 2 and Figure 4 As shown, the bidirectional DC charging box 103 also includes: a controller 1033; a second acquisition module 1034, which is communicatively connected to the controller 1033 and is used to acquire the charging and discharging voltage of the electric vehicle; and a voltage regulation module 1035, which includes a relay circuit. The relay circuit includes multiple switching states, each of which corresponds to a preset voltage range. The controller 1033 is used to adjust the switching states of the relay circuit based on the comparison result between the charging and discharging voltage of the electric vehicle and the preset voltage range.

[0110] In this embodiment, the bidirectional DC charging box 103 includes a controller 1033 and a second acquisition module 1034. The second acquisition module 1034 acquires the charging and discharging voltage of the electric vehicle. The second acquisition module 1034 transmits the acquired charging and discharging voltage of the electric vehicle to the controller 1033. The controller 1033 controls the relay circuit switching state of the voltage regulation module 1035 based on the charging and discharging voltage, thereby dynamically adjusting the voltage at which the bidirectional DC charging box 103 charges the electric vehicle through the battery box 102, or dynamically adjusting the voltage at which the bidirectional DC charging box 103 charges the battery box 102 through the electric vehicle.

[0111] For example, such as Figure 4 As shown, the relay circuit includes multiple relays, denoted as relay S1, relay S2, relay S3, relay S4, relay S5, relay S6, relay S7, and relay S8. Relays S2, S3, S5, and S6 are defined as parallel relays. Relays S1 and S7 are defined as series relays. Relays S4 and S8 are defined as bypass relays. The voltage range on the electric vehicle side is 150V to 1000V, and the voltage range on the battery box 102 side is also 150V to 1000V.

[0112] If the voltage on both the electric vehicle side and the battery box 102 side is within the range of 150V to 500V, all parallel relays will be activated. If the voltage on both the electric vehicle side and the battery box 102 side is within the range of 500V to 1000V, all series relays will be activated. The voltage hysteresis is set to 15V.

[0113] By employing relay circuits, the series or parallel connection of relay branches can be flexibly switched according to the voltage range of the electric vehicle and the battery box 102, thereby achieving a wide range of output functions.

[0114] This application integrates a controller 1033 and a second acquisition module 1034 into the bidirectional DC charging box 103 to acquire the charging and discharging voltage of the electric vehicle. Based on the charging and discharging voltage of the electric vehicle, the switching state of the relay circuit is adjusted, which enables the energy storage system 100 to have a wider range of input and output voltages, thus making it suitable for more application scenarios.

[0115] In some embodiments of this application, optionally, Figure 5 The following are schematic diagrams illustrating the system architecture of an energy storage system 100 according to some embodiments of this application, such as... Figure 5 As shown, there is at least one battery box 102; at least one battery box 102 is connected in series via a first DC bus 1022.

[0116] This application reduces the energy conversion levels and improves the energy utilization rate of the energy storage system 100 by connecting multiple battery boxes 102 in series through the first DC bus 1022 and then combining them with the bidirectional DC charging box 103 and the energy storage inverter 106 through the combiner unit 104.

[0117] In some embodiments of this application, optionally, such as Figure 5 As shown, the energy storage system 100 also includes a base 108, located at the bottom of the energy storage system 100, for fixing the bidirectional DC charging box 103, the high-voltage electrical junction box 105 and the battery box 102 after being stacked.

[0118] This application provides a base 108 at the bottom of the energy storage system 100 to support multiple battery boxes 102, high-voltage electrical junction box 105 and bidirectional DC charging box 103. This can achieve safety protection for the bottom ports of the battery boxes 102 and ground fixation of the entire energy storage system 100, thereby improving the stability of the energy storage system 100.

[0119] In some embodiments of this application, optionally, such as Figure 1 As shown, the bidirectional DC charging box 103 also includes a heat dissipation module 1036, which is used to dissipate heat from the bidirectional DC / DC conversion module 1032.

[0120] This application provides an active heat dissipation module 1036 in the bidirectional DC charging box 103. The heat dissipation module 1036 reduces the heat generated by the bidirectional DC / DC conversion module 1032 during operation, preventing the bidirectional DC / DC conversion module 1032 from overheating and causing damage or shutdown, thereby improving the safety and stability of the energy storage system 100.

[0121] In some embodiments of this application, the bidirectional DC charging box 103, the high-voltage electrical junction box 105, and the battery box 102 may optionally be stacked together via blind-fit terminals.

[0122] This application provides blind-plug terminals on the top and bottom of the bidirectional DC charging box 103, the high-voltage electrical junction box 105, and the battery box 102, thereby reducing the difficulty of splicing and installing the components in the energy storage system 100.

[0123] In some embodiments of this application, the energy storage system 100 can be a home energy storage system, which can be used to power home appliances or electric vehicles, or to store electrical energy.

[0124] The methods can be implemented in various ways depending on specific features and / or example applications. For example, these methods can be implemented by a combination of hardware, firmware, and / or software. For instance, in a hardware implementation, the processor can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, electronic devices, other device units for performing the functions described above, and / or combinations thereof.

[0125] A computer-readable storage medium can be a tangible device that holds and stores instructions for use by an instruction execution device. A computer-readable storage medium can be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing, but is not limited thereto. A non-exhaustive list of more specific examples of computer-readable storage media includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory, static random-access memory (SRAM), portable optical disc read-only memory (CD-ROM), digital video disc (DVD), memory cards, floppy disks, encoding mechanical devices (e.g., punched cards or grooves with raised structures for recording instructions), and any suitable combination of the foregoing. The computer-readable storage medium used herein should not be construed as the transmission signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media, or electrical signals transmitted through wires.

[0126] In the description of this application, the term "multiple" refers to two or more. Unless otherwise expressly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0127] In the description of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] The above description is merely a preferred embodiment of this application and is not intended to limit this 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 protection scope of this application.

Claims

1. An energy storage system, characterized in that, include: A battery box for storing electrical energy, the battery box including a first DC bus and a battery module, the first DC bus being electrically connected to the battery module; A bidirectional DC charging box includes: a second DC bus and a bidirectional DC / DC conversion module. A first side of the bidirectional DC / DC conversion module is used to connect a charging gun, which is used to connect to an electric vehicle. The second side of the bidirectional DC / DC conversion module is electrically connected to the second DC bus. A high-voltage electrical junction box, the high-voltage electrical junction box including a busbar unit, the busbar unit being used for electrically connecting the first DC bus and the second DC bus; The bidirectional DC charging box, the high-voltage electrical junction box, and the battery box are stacked together. The bidirectional DC / DC conversion module is used to convert the DC power output from the battery box into voltage and then charge the electric vehicle after the charging gun is connected to the electric vehicle; and / or, to convert the DC power output from the electric vehicle into voltage and then charge the battery box.

2. The energy storage system according to claim 1, characterized in that, include: The high-voltage electrical junction box is located between the battery box and the bidirectional DC charging box.

3. The energy storage system according to claim 2, characterized in that, include: The bidirectional DC charging box is located at the top of the high-voltage electrical junction box, and the battery box is located at the bottom of the high-voltage electrical junction box.

4. The energy storage system according to claim 1, characterized in that, include: The high-voltage electrical junction box also includes an energy management module, which is communicatively connected to the bidirectional DC charging box and the battery box.

5. The energy storage system according to claim 4, characterized in that, The high-voltage electrical junction box also includes: The first acquisition module is electrically connected to the combiner unit and communicatively connected to the energy management module. The first acquisition module is used to acquire current and voltage information of electrical signals flowing through the combiner unit and transmit them to the energy management module.

6. The energy storage system according to claim 4, characterized in that, Also includes: An energy storage inverter is communicatively connected to the energy management module. The energy storage inverter includes a third DC bus, which is electrically connected to the first DC bus and the second DC bus through the combiner unit.

7. The energy storage system according to claim 6, characterized in that, The energy storage inverter is used to connect to the power grid. The energy storage inverter is used to convert the AC power output from the power grid into DC power to charge the battery box, or to convert the AC power output from the power grid into DC power and then charge the electric vehicle through the bidirectional DC charging box. The energy storage inverter is also used to connect to an AC load. The energy storage inverter is used to invert the DC power in the battery box into AC power and then supply power to the AC load, or to receive DC power from the electric vehicle from the bidirectional DC charging box, invert it into AC power, and then supply power to the AC load.

8. The energy storage system according to claim 6, characterized in that, The high-voltage electrical junction box also includes: The battery box, the bidirectional DC charging box, the energy management module, and the energy storage inverter are all connected via the communication interface.

9. The energy storage system according to claim 6, characterized in that, The energy storage inverter also includes: A photovoltaic connection port, which is used to connect a photovoltaic panel; A DC-DC converter, wherein a first side of the DC-DC converter is electrically connected to the photovoltaic connection port, and a second side of the DC-DC converter is electrically connected to the third DC bus, the DC-DC converter being used to charge the battery box with DC power output from the photovoltaic panel or to charge the electric vehicle with the bidirectional DC charging box.

10. The energy storage system according to any one of claims 1 to 9, characterized in that, The bidirectional DC charging box also includes: Controller; The second acquisition module is communicatively connected to the controller and is used to acquire the charging and discharging voltage of the electric vehicle. A voltage regulating module, the voltage regulating module including a relay circuit, the relay circuit including multiple switching states, each of the switching states corresponding to a preset voltage range; The controller is used to adjust the switching state of the relay circuit based on a comparison between the charging and discharging voltage of the electric vehicle and the preset voltage range.

11. The energy storage system according to any one of claims 1 to 9, characterized in that, The number of battery boxes is at least one; at least one of the battery boxes is connected in series through the first DC bus.

12. The energy storage system according to any one of claims 1 to 9, characterized in that, The energy storage system also includes: The base, located at the bottom of the energy storage system, is used to fix the stacked bidirectional DC charging box, the high-voltage electrical junction box, and the battery box.

13. The energy storage system according to any one of claims 1 to 9, characterized in that, The bidirectional DC charging box also includes: A heat dissipation module is provided for dissipating heat from the bidirectional DC / DC conversion module.

14. The energy storage system according to any one of claims 1 to 9, characterized in that, The bidirectional DC charging box, the high-voltage electrical junction box, and the battery box are stacked together via blind-plug terminals.

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