Energy storage system

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to an energy storage system. According to the utility model, through the combined design of the connection modes of the high-voltage box and the PCS, wires required for connection between the high-voltage box and the PCS can be reduced. The number of wires is reduced, on one hand, the cable purchase and installation cost is reduced, on the other hand, the space occupied by a large number of wires of the energy storage system is reduced, and therefore the size of the energy storage system is effectively reduced. Moreover, the number of connecting wires is reduced, so that the installation process is simpler and more convenient, troubleshooting is easier during maintenance, and the efficiency of installation and maintenance is improved. Besides, the high-voltage box and the PCS are selected to be electrically connected along the first direction or the second direction according to installation requirements, and different installation environments can be adapted, so that the technical problem of poor space applicability of an existing energy storage system is solved.

Description

Technical Field

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

[0002] With the continuous development of energy storage technology, the high-voltage box in the integrated energy storage unit is a key component. Its connection and collaborative work with the PCS (Power Conversion System) and battery clusters are crucial to the performance of the entire energy storage system.

[0003] In traditional energy storage systems, the high-voltage box and the PCS (Pressure Processing Unit) are typically separate installations connected by long cables. This connection method presents several problems. First, the long cables increase system costs, including the procurement cost of the cables themselves and labor costs during installation. Second, the numerous cables increase the size of the energy storage system, making space occupancy a critical issue in space-constrained applications, such as the construction of energy storage power stations in specific locations. Furthermore, the complex wiring increases the difficulty of installation and maintenance, making troubleshooting more challenging and impacting the efficient and stable operation of the energy storage system.

[0004] Furthermore, different application scenarios have varying requirements for the physical dimensions of energy storage systems. For example, in scenarios with height constraints, traditional energy storage system layouts may not meet installation requirements; while in scenarios with width constraints, existing structures are also difficult to adapt. Therefore, a new technological solution is needed to address these issues, optimize the design of energy storage systems to meet the needs of different scenarios, and improve the applicability and performance of energy storage systems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an energy storage system that solves the technical problem of poor space applicability of existing energy storage systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides an energy storage system, including a high-voltage box and a PCS that are electrically connected to each other;

[0008] The high-voltage box is electrically connected to the PCS along a first direction or a second direction, and the high-voltage box is connected to one side of the PCS, wherein the first direction and the second direction are perpendicular to each other.

[0009] In one possible implementation, the high-voltage box includes a housing, a BCU and an auxiliary power supply disposed within the housing, the BCU being electrically connected to the auxiliary power supply.

[0010] In one possible implementation, when the high-voltage box is electrically connected to the PCS along a first direction, the BCU and the auxiliary power supply are arranged within the housing along a second direction.

[0011] In one possible implementation, when the high-voltage box is electrically connected to the PCS along a second direction, the BCU and the auxiliary power supply are arranged within the housing along the first direction.

[0012] In one possible implementation, the energy storage system further includes a battery cluster electrically connected to the PCS via the high-voltage box.

[0013] In one possible implementation, the high-voltage box further includes two connection ports disposed on the housing, and both the BCU and the auxiliary power supply are electrically connected to the connection ports.

[0014] In one possible implementation, the battery cluster is electrically connected to one of the connection ports, and the PCS is electrically connected to the other connection port.

[0015] The beneficial effects of this invention are that, compared with the prior art, by combining the connection method of the high-voltage box and the PCS, the required wiring between the high-voltage box and the PCS can be reduced. Reducing the wiring lowers the cost of cable procurement and installation, and also reduces the space occupied by the energy storage system due to numerous connections, thereby effectively reducing the size of the energy storage system. Moreover, the reduction in wiring simplifies the installation process and makes troubleshooting easier during maintenance, improving installation and maintenance efficiency. Furthermore, by selecting whether to electrically connect the high-voltage box and the PCS along a first or second direction according to installation needs, it can adapt to different installation environments, thus solving the technical problem of poor space adaptability of existing energy storage systems. Attached Figure Description

[0016] Figure 1 The electrical topology diagram of the high-voltage box provided in the embodiments of this application is shown.

[0017] Figure 2 This is a structural schematic diagram of a high-pressure box provided in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the internal structure of a high-voltage box provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the internal structure of another high-pressure box provided in an embodiment of this application.

[0020] 1. High-voltage box; 11. Housing; 12. Auxiliary power supply; 13. BCU; 14. Connection port. Detailed Implementation

[0021] To address the aforementioned technical problems, this invention provides an energy storage system. The technical solution and embodiments of this invention will now be described in detail with reference to the accompanying drawings.

[0022] See Figure 1 The following is a description of the main components and their functions contained in the high-voltage box:

[0023] DC Circuit Breaker

[0024] Function: Automatically disconnects the circuit in case of overcurrent, short circuit, or other faults to protect the system. The circuit breaker is manually operated for easy maintenance and repair.

[0025] Features: 1. High interruption capacity and fast response. 2. Equipped with overcurrent protection and short-circuit protection functions.

[0026] Fuse

[0027] Function: It fuses in case of overcurrent to protect the circuit and equipment. It is used in conjunction with a circuit breaker as backup protection.

[0028] Features: Fast fuse, short response time. Single-use only, requires replacement.

[0029] AC and DC busbars

[0030] Function: Connects battery packs, PCS, and other electrical components to enable power transfer. Provides low-impedance, highly conductive electrical connections.

[0031] Features: Highly conductive materials (such as copper or aluminum), low heat generation, and high reliability.

[0032] BCU:

[0033] The BCU is the core control unit of the Battery Management System (BMS), typically working in conjunction with the BMU (Battery Management Unit) or other submodules. The BCU's primary responsibility is to monitor, collect, analyze, and control the battery pack's operating status in real time, ensuring the safe, reliable, and efficient operation of the battery pack.

[0034] Terminal blocks (also known as wiring terminal blocks or terminal boards) are primarily used for connecting, distributing, and managing electrical circuits. They serve multiple purposes, including simplifying wiring, enhancing safety, supporting signal transmission, and facilitating maintenance and expansion. Through proper design and material selection, terminal blocks can effectively support the efficient and stable operation of energy storage systems.

[0035] The auxiliary power supply serves the following purposes:

[0036] 1. Power supply for the control and management system

[0037] Supports Battery Management System (BMS): The BMS needs to monitor battery parameters such as voltage, current, and temperature in real time, calculate the battery's remaining capacity (SOC) and state of health (SOH), and perform operations such as battery balancing. The auxiliary power supply provides stable power to ensure the normal operation of these functions.

[0038] Ensuring the Energy Management System (EMS): The EMS is responsible for the optimization and scheduling decisions of the entire energy storage system. It needs to operate continuously and interact with other components. The auxiliary power supply provides reliable power support for its operation, enabling it to send control commands in a timely and accurate manner. Maintaining the Control Circuitry of the Power Conversion System (PCS): The PCS control circuitry requires a stable power supply to achieve precise control of the charging and discharging process of the energy storage battery pack and the AC / DC conversion function. The auxiliary power supply ensures the stable operation of its control circuitry.

[0039] 2. Ensuring System Safety and Protection Functions: The overvoltage, overcurrent, and short-circuit protection circuits in the electrochemical energy storage system need to be constantly operational to monitor the system's operating status. The auxiliary power supply provides power to these protection circuits, enabling them to react quickly in abnormal situations, cutting off circuits or taking other protective measures to protect equipment and personnel safety. Driving the Cooling System: The system generates heat during operation, especially during high-power charging and discharging, where heat dissipation becomes a significant issue. The auxiliary power supply powers the cooling fan or other cooling devices, ensuring the system operates within a suitable temperature range and preventing overheating that could lead to battery performance degradation, shortened lifespan, or even safety hazards.

[0040] 3. Provide emergency backup power: In the event of a main power failure or power outage, the auxiliary power supply can serve as an emergency power source to provide temporary power to critical control and communication equipment, ensuring that the system can perform safe shutdown operations or maintain necessary monitoring functions, and preventing data loss and equipment damage.

[0041] Improving power quality and stabilizing voltage: Auxiliary power supplies can provide stable voltage output to various components in the system through voltage regulation circuits and other means, reducing voltage fluctuations and ripple, ensuring stable operation of equipment, and improving the overall performance of the system.

[0042] 4. Powering communication equipment: The electrochemical energy storage system needs to communicate with external monitoring centers, power grid dispatching, etc. The auxiliary power supply provides power to communication modules, routers and other equipment to ensure smooth communication, so that the system's operating data can be uploaded in a timely manner, and it can also receive external control commands.

[0043] 5. Assisting in the operation of monitoring equipment: Various sensors and monitoring instruments in the system require power to operate. The auxiliary power supply provides them with energy so that they can monitor the system's operating parameters in real time and provide data support for the system's management and maintenance.

[0044] DC relay

[0045] It is mainly used for circuit switching control, system protection, electrical isolation and automatic control.

[0046] Voltage / current acquisition equipment

[0047] It can be a Hall effect sensor, a current transformer (CT), or a shunt, used to monitor the current magnitude in real time and provide data support for system control, protection, and management.

[0048] The present invention will now be described in detail through specific embodiments. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can refer to fixed connection, detachable connection, or integral connection; for those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] It should be noted that the first direction in this application refers to the thickness direction of the high-pressure box 1 or PCS, and the second direction refers to the height direction of the high-pressure box 1 or PCS. In the figure, the first direction is represented as direction a, and the second direction is represented as direction b. The PCS is not shown in the structural diagram.

[0053] like Figures 2 to 4As shown, the high-voltage box 1 is electrically connected to the PCS along a first direction or a second direction, and the high-voltage box 1 is connected to one side of the PCS, with the first direction and the second direction being perpendicular to each other. The high-voltage box 1 includes a housing 11, and a BCU 13 and an auxiliary power supply 12 disposed within the housing 11, with the BCU 13 and the auxiliary power supply 12 electrically connected. When the high-voltage box 1 is electrically connected to the PCS along the first direction, the BCU 13 and the auxiliary power supply 12 are disposed within the housing 11 along the second direction. When the high-voltage box 1 is electrically connected to the PCS along the second direction, the BCU 13 and the auxiliary power supply 12 are disposed within the housing 11 along the first direction. The energy storage system also includes a battery cluster (not shown in the figure), which is electrically connected to the PCS via the high-voltage box 1. The high-voltage box 1 also includes two connection ports 14 disposed on the housing 11, with both the BCU 13 and the auxiliary power supply 12 electrically connected to the connection ports 14. The battery cluster is electrically connected to one connection port 14, and the PCS is electrically connected to the other connection port 14.

[0054] See Figure 2 and Figure 3 In one embodiment, when facing a project with a highly limited energy storage system, the high-voltage box 1 and the PCS are electrically connected along a first direction, and the BCU 13 and the auxiliary power supply 12 are arranged in the housing 11 along a second direction, that is, the high-voltage box 1 and the PCS are designed with a left-right structure.

[0055] First, determine the specific specifications and parameters of the PCS and high-voltage box 1 according to the project requirements, and ensure that the output voltage and current of the battery cluster match the input specifications of the high-voltage box 1, and the output voltage and current of the high-voltage box 1 match the input specifications of the PCS.

[0056] During installation, install the PCS on the left and high-voltage box 1 on the right (or vice versa). Using proper wiring, connect the battery packs to the input terminal of high-voltage box 1 using DC cables, and connect the output terminal of high-voltage box 1 to the DC input terminal of the PCS using a DC bus. Strictly adhere to electrical installation specifications during the connection process to ensure stability and safety.

[0057] After installation, the high-voltage box 1 begins to function. In terms of power distribution, when the battery cluster is fully charged and there is a load that needs power, the high-voltage box 1 distributes the power of the battery cluster to the PCS. After power conversion, the PCS provides appropriate power to the load. When the battery cluster is low on power, the high-voltage box 1 distributes the power obtained by the PCS from the grid to the battery cluster for charging.

[0058] In terms of electrical protection, when the system detects an overvoltage condition, the DC circuit breaker quickly cuts off the circuit to prevent excessive voltage from damaging the equipment; when an overcurrent condition occurs, the fuse blows, which also provides protection.

[0059] In terms of monitoring and communication, the communication module BCU13 collects parameters such as voltage, current, and temperature in real time and sends this data to the BMS and PCS. The BMS manages the battery clusters based on this data, such as adjusting charging and discharging strategies; the PCS adjusts its own operating status based on this data to ensure the stable operation of the entire energy storage system.

[0060] like Figure 4 As shown, in another embodiment, for scenarios with limited width, the high-voltage box 1 and the PCS are electrically connected along the second direction, while the BCU 13 and the auxiliary power supply 12 are arranged within the housing 11 along the first direction, i.e., a top-bottom structure is adopted for the high-voltage box 1 and the PCS combined. During installation, the PCS is installed on top, and the high-voltage box 1 is installed on the bottom (or vice versa), and the connection between the battery pack and the high-voltage box 1, and between the high-voltage box 1 and the PCS, is performed according to specifications. During operation, the working principle of each component and function is similar to that of the left-right structure, only the layout is adapted to the characteristics of limited width.

[0061] Through the above specific implementation methods, the high-voltage box 1 and PCS combined structure of the energy storage system of this utility model can play an advantage in different application scenarios, achieve the purpose of reducing wiring, reducing costs, reducing volume and facilitating installation and maintenance, and improve the overall performance and applicability of the energy storage system.

[0062] Firstly, by combining the high-voltage box 1 with the PCS, the number of connections between the two is reduced, directly lowering cable procurement and installation costs. The reduced number of cables also decreases the probability of system failures due to cable faults, improving system reliability.

[0063] Secondly, it reduces the size of the energy storage system. In today's context of increasingly scarce land resources, reducing size is crucial for both the construction of energy storage power stations and other energy storage applications. A smaller size means more energy storage devices can be installed in a limited space, or an energy storage system can be easily installed in a specific space, improving space utilization.

[0064] Furthermore, in terms of installation and maintenance, the reduced number of wiring makes the installation process simpler and faster, reducing installation time and workload. During maintenance, the fewer wiring connections make troubleshooting easier, enabling quicker location and resolution of problems, reducing maintenance costs and downtime, and improving the operating efficiency of the energy storage system.

[0065] Finally, the availability of both left-right and top-bottom layouts for different application scenarios significantly improves the adaptability of the energy storage system. It can meet the needs of different scenarios with height or width limitations, broadening the application scope of energy storage systems and promoting the application and development of energy storage technology in more fields.

[0066] In summary, the high-voltage box 1 combined with the PCS structure of the energy storage system of this utility model has obvious advantages in terms of cost, size, installation and maintenance, and application adaptability, and has good application prospects and promotion value.

[0067] The above description is merely a preferred embodiment of the present invention, and the specific embodiments described above are not intended to limit the present invention. Various modifications and variations can be made within the scope of the technical concept of the present invention. All refinements, modifications, or equivalent substitutions made by those skilled in the art based on the above description are within the scope of protection of the present invention.

Claims

1. An energy storage system, characterized by, The high-voltage box and the PCS are electrically connected along a first direction or a second direction, and one side of the high-voltage box is connected with the PCS, the first direction being perpendicular to the second direction. The high-voltage box comprises a shell, a BCU and an auxiliary power supply arranged in the shell, and the BCU is electrically connected with the auxiliary power supply.

2. The energy storage system of claim 1, wherein, When the high-voltage box is electrically connected with the PCS along the first direction, the BCU and the auxiliary power supply are arranged in the shell along the second direction.

3. The energy storage system of claim 2, wherein, When the high-voltage box is electrically connected with the PCS along the second direction, the BCU and the auxiliary power supply are arranged in the shell along the first direction.

4. The energy storage system of claim 2, wherein, The energy storage system further comprises a battery cluster, and the battery cluster is electrically connected with the PCS through the high-voltage box.

5. The energy storage system of claim 2, wherein, The high-voltage box further comprises two connection ports arranged on the shell, and the BCU and the auxiliary power supply are electrically connected with the connection ports.

6. The energy storage system of claim 5, wherein, The battery cluster is electrically connected with one of the connection ports, and the PCS is electrically connected with the other connection port.

7. The energy storage system of claim 6, wherein, ​

Images