An energy storage container with isolated charging and discharging circuits

Abstract

This utility model relates to the field of new energy power technology, specifically to an energy storage container with isolated charging and discharging circuits. It includes an interlocking circuit for distributing AC energy and switching auxiliary power inputs. The interlocking circuit and a three-phase AC bus form an AC-side common connection network, creating AC systems with different charging and discharging circuits. This allows the energy storage system to meet the normal power demand of off-grid loads while simultaneously charging and replenishing power on the grid side. The auxiliary power system employs a dual-circuit automatic switching interlocking switch design to ensure that even when a single circuit is energized or fails, the auxiliary power system equipment can still receive a stable power supply, effectively addressing the risk of single power source failure and significantly improving the reliability and continuity of system operation.

Description

Technical Field

[0001] This utility model relates to the field of new energy power technology, specifically to an energy storage container with isolated charging and discharging circuits. Background Technology

[0002] With the increasing global demand for renewable energy, energy storage technology is rapidly developing as a key means to address the intermittency and volatility of new energy sources. Among numerous energy storage solutions, energy storage containers are widely used in various fields such as new energy power generation support, grid frequency regulation and peak shaving, industrial and commercial power management, electric vehicle charging stations, and off-grid power supply for islands due to their modular design, ease of deployment and maintenance, etc. These application scenarios require energy storage systems not only to effectively store electrical energy, but also to achieve flexible energy conversion between AC and DC, and provide stable and reliable power output.

[0003] The core component of an energy storage container is the power converter (PCS), which integrates rectifier (AC→DC) and inverter (DC→AC) circuits. It can convert AC power from the grid or load into DC power for battery charging, or convert DC power from the battery into AC power to feed back to the grid or supply AC loads. This bidirectional power conversion capability enables the energy storage system to effectively manage energy flow, optimize power utilization efficiency, and support diverse application requirements.

[0004] However, in certain specific application scenarios, such as the power supply needs of high-power loads with weak power infrastructure in the construction sector, existing energy storage containers face certain technical bottlenecks. Especially on construction sites, when the grid capacity is insufficient to support heavy equipment such as tower cranes (peak power 400kW) and concrete pump trucks, the topology of traditional energy storage systems limits their flexibility. Specifically, the physical mutual exclusion between grid-connected charging mode (AC / DC) and off-grid discharging mode (DC / AC) of the energy storage converter (PCS) means that simultaneous charging and power supply cannot meet the demand, causing power outages for critical equipment and affecting construction progress. Furthermore, existing solutions using a single AC bus design require mechanical electrical isolation during mode switching, which not only increases manual maintenance costs but also poses potential safety hazards and reduces the system's operational convenience and power supply continuity. Utility Model Content

[0005] To address the shortcomings and deficiencies of existing technologies, this utility model provides an energy storage container with isolated charging and discharging circuits. This container employs a dual-circuit topology design, which, while ensuring the stability of power supply to off-grid loads, enables synchronous charging and energy replenishment on the grid side. This solves the problem of mutual exclusion between charging and discharging modes in traditional energy storage devices.

[0006] To achieve the above objectives, the present invention provides an energy storage container with isolated charging and discharging circuits, comprising an interlock circuit for distributing AC energy and switching auxiliary power input, a DC bus, a three-phase AC bus, auxiliary power system equipment, a battery cluster, a DC distribution cabinet, an energy storage converter (PCS) cabinet, an AC distribution cabinet, and a rectifier charging module. The AC distribution cabinet and the interlock circuit are electrically connected to the three-phase AC bus, forming a common connection network on the AC side of the system. The power input terminal of the auxiliary power system equipment is electrically connected to the output terminal of the interlock circuit, for receiving AC power from the grid side or the PCS discharging circuit. The power output terminal of the auxiliary power system equipment is electrically connected to the battery cluster, and the rectifier charging module... The battery pack is connected to the three-phase AC bus via a first isolation transformer, which is located on the AC side between the rectifier charging module and the interlocking circuit to achieve electrical isolation and voltage matching between the grid side and the charging circuit. One end of the DC distribution cabinet is electrically connected to the battery pack, and the other end is electrically connected to the DC input terminal of the energy storage converter PCS cabinet, forming a DC path for the discharge circuit. The DC bus is connected between the DC distribution cabinet and the energy storage converter PCS cabinet, and is electrically connected to the DC side of the DC distribution cabinet, the energy storage converter PCS cabinet, and the DC output terminal of the rectifier charging module, respectively. The AC distribution cabinet is equipped with an off-grid load output branch, which is used to supply power to external off-grid loads.

[0007] Furthermore, the interlocking circuit includes a first circuit breaker and a second circuit breaker. The input terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer, and the output terminal of the first circuit breaker is electrically connected to the auxiliary power system equipment. The input terminal of the second circuit breaker is connected to the power grid side of the three-phase AC bus, and the output terminal of the second circuit breaker is electrically connected to the auxiliary power system equipment.

[0008] Furthermore, the interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The input terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer, and the output terminal of the first circuit breaker is electrically connected to the input terminal of the second interlocking contactor. The output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The input terminal of the second circuit breaker is connected to the grid side of the three-phase AC busbar. The output terminal of the second circuit breaker is electrically connected to the input terminal of the first interlocking contactor, and the output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The incoming terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer to receive AC power output from the inverter of the energy storage converter PCS cabinet; the main contact incoming terminal of the second interlock contactor is connected to the outgoing terminal of the first circuit breaker, and the main contact outgoing terminal of the second interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system equipment; the incoming terminal of the second circuit breaker is connected to the grid side of the three-phase AC bus to connect to the external power grid; the outgoing terminal of the second circuit breaker is electrically connected to the main contact incoming terminal of the first interlock contactor, and the main contact outgoing terminal of the first interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system when the power grid is normal.

[0009] Furthermore, an electrical interlocking and / or mechanical interlocking structure is provided between the first interlocking contactor and the second interlocking contactor.

[0010] Furthermore, the control circuits of the first and second interlocking contactors are respectively connected in series with each other's normally closed auxiliary contacts to form an electrical interlocking circuit. The coil control branch of the first interlocking contactor is connected in series with the normally closed auxiliary contact of the second interlocking contactor, and the coil control branch of the second interlocking contactor is connected in series with the normally closed auxiliary contact of the first interlocking contactor. When the first contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the second contactor. When the second contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the first contactor, preventing both from conducting simultaneously, and realizing safe switching between power supplies and preventing parallel operation.

[0011] Furthermore, the auxiliary power system equipment includes a battery management system, an energy management system, and an environmental monitoring system; the power input terminal of the battery management system is electrically connected to the output terminal of the first circuit breaker, and the power output terminal of the battery management system is electrically connected to the battery cluster; one end of the environmental monitoring system is electrically connected to the output terminal of the first circuit breaker, and the other end is electrically connected to the communication interfaces of the battery cluster, the rectifier charging module, and the energy storage converter PCS cabinet respectively; the energy management system is communicatively connected to the battery management system and the environmental monitoring system.

[0012] Furthermore, a third circuit breaker is installed inside the AC distribution cabinet. The incoming terminal of the third circuit breaker is electrically connected to the output side of the second isolation transformer, and the outgoing terminal of the third circuit breaker is connected to the off-grid load output branch for supplying power to the external off-grid load.

[0013] Furthermore, the auxiliary power system equipment also includes multiple cooling fans and an air conditioner; one end of the cooling fan is electrically connected to the environmental system, and the other end is electrically connected to the rectifier module and energy storage converter PCS cabinet; one end of the air conditioner is electrically connected to the environmental monitoring system, and the other end is electrically connected to the battery cluster.

[0014] Furthermore, the auxiliary power system equipment also includes a fire protection system, which is electrically connected to the battery cluster.

[0015] Furthermore, the battery cluster is composed of multiple batteries connected in series and parallel.

[0016] The beneficial effects of this utility model are:

[0017] This invention provides an energy storage container with isolated charging and discharging circuits. An AC-side common connection network is constructed via an interlocking circuit and a three-phase AC bus, creating AC systems with different charging and discharging circuits. This allows the energy storage system to meet the power demands of off-grid loads under normal conditions while simultaneously charging and replenishing power on the grid side. The auxiliary power system employs a dual-circuit automatic switching interlocking switch design, ensuring that the auxiliary power system equipment continues to receive stable power even when a single circuit is energized or fails, effectively addressing the risk of single power source failure and significantly improving the reliability and continuity of system operation. The AC distribution cabinet is equipped with off-grid load output branches, allowing flexible power supply to external off-grid loads. This supports independent power supply in grid outages, remote areas, or emergency scenarios, greatly expanding the application boundaries of the energy storage container and enhancing its adaptability under complex operating conditions. The rectifier charging module is connected to the three-phase AC bus via a first isolation transformer, achieving electrical isolation between the grid side and the DC charging circuit, effectively suppressing common-mode interference and fault propagation. Furthermore, voltage matching ensures the stability and safety of the charging process, improving the overall insulation performance and anti-interference capability of the system. The DC distribution cabinet, energy storage converter (PCS) cabinet, DC bus, and battery clusters together form a complete charging and discharging energy path. The DC output of the rectifier charging module is connected to the DC bus, enabling efficient conversion and transmission of electrical energy between the AC and DC sides. This ensures smooth energy flow during charging and discharging of the battery clusters, improving the overall energy utilization efficiency and dynamic response capability of the system. By adopting a dual-loop topology design, while ensuring continuous and stable power supply to local off-grid loads, it supports synchronous charging and energy replenishment from the grid side. This overcomes the technical bottlenecks of traditional energy storage devices that "cannot discharge while charging" or "mutually exclusive charging and discharging modes," achieving parallel operation of charging and discharging functions. This innovative architecture significantly improves the operational flexibility and resource utilization of the energy storage system, making it particularly suitable for critical application scenarios such as high-reliability power supply, microgrids, emergency power supplies, and multi-task parallel operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the frame of an energy storage container with isolated charging and discharging circuits according to the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure of an energy storage container with isolated charging and discharging circuits according to the present invention. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] This invention proposes an energy storage container with isolated charging and discharging circuits.

[0024] In the embodiments of this utility model, such as Figure 1-2As shown, this energy storage container with isolated charging and discharging circuits includes an interlock circuit for distributing AC energy and switching auxiliary power input, a DC bus, a three-phase AC bus, auxiliary power system equipment, a battery cluster, a DC distribution cabinet, an energy storage converter PCS cabinet, an AC distribution cabinet, and a rectifier charging module. The AC distribution cabinet and the interlock circuit are both electrically connected to the three-phase AC bus, forming a common connection network on the AC side of the system. The power input terminal of the auxiliary power system equipment is electrically connected to the output terminal of the interlock circuit to receive AC power from the grid side or the PCS discharging circuit. The power output terminal of the auxiliary power system equipment is electrically connected to the battery cluster. The rectifier charging module is connected to the battery cluster via a first isolation transformer. The device is connected to the three-phase AC bus, and the first isolation transformer is set on the AC side between the rectifier charging module and the interlock circuit to achieve electrical isolation and voltage matching between the grid side and the charging circuit; one end of the DC distribution cabinet is electrically connected to the battery cluster, and the other end is electrically connected to the DC input terminal of the energy storage converter PCS cabinet, forming a DC path for the discharge circuit; the DC bus is connected between the DC distribution cabinet and the energy storage converter PCS cabinet, and is electrically connected to the DC side of the DC distribution cabinet, the energy storage converter PCS cabinet, and the DC output terminal of the rectifier charging module respectively; the AC distribution cabinet is equipped with an off-grid load output branch, which is used to supply power to external off-grid loads.

[0025] In this embodiment, the interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The input terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer, the output terminal of the first circuit breaker is electrically connected to the input terminal of the second interlocking contactor, and the output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The input terminal of the second circuit breaker is connected to the grid side of the three-phase AC busbar. The output terminal of the second circuit breaker is electrically connected to the input terminal of the first interlocking contactor, and the output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The incoming terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer to receive AC power output from the inverter of the energy storage converter PCS cabinet; the main contact incoming terminal of the second interlock contactor is connected to the outgoing terminal of the first circuit breaker, and the main contact outgoing terminal of the second interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system equipment; the incoming terminal of the second circuit breaker is connected to the grid side of the three-phase AC bus to connect to the external power grid; the outgoing terminal of the second circuit breaker is electrically connected to the main contact incoming terminal of the first interlock contactor, and the main contact outgoing terminal of the first interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system when the power grid is normal.

[0026] In this embodiment, an electrical and / or mechanical interlocking structure is provided between the first and second interlocking contactors. The purpose is to ensure that they cannot close simultaneously, achieving safe switching between the grid power supply circuit and the energy storage converter PCS cabinet power supply circuit, and preventing power backflow or parallel operation.

[0027] In this embodiment, the normally closed auxiliary contacts of the first and second interlocking contactors are connected in series in their control circuits to form an electrical interlocking circuit. The normally closed auxiliary contact of the second interlocking contactor is connected in series in the coil control branch of the first interlocking contactor, and the normally closed auxiliary contact of the first interlocking contactor is connected in series in the coil control branch of the second interlocking contactor. When the first contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the second contactor. When the second contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the first contactor, preventing both from conducting simultaneously, and realizing safe switching and anti-parallel operation between power supplies.

[0028] In this embodiment, the auxiliary power system includes a battery management system, an energy management system, and an environmental monitoring system. The power input terminal of the battery management system is electrically connected to the output terminal of the first circuit breaker QF10, and the power output terminal of the battery management system is electrically connected to the battery cluster. One end of the environmental monitoring system is electrically connected to the output terminal of the first circuit breaker QF10, and the other end is electrically connected to the communication interfaces of the battery cluster, the rectifier charging module, and the energy storage converter PCS cabinet, respectively. The energy management system is communicatively connected to the battery management system and the environmental monitoring system.

[0029] Furthermore, a third circuit breaker Q2 is installed inside the AC distribution cabinet. The incoming terminal of the third circuit breaker Q2 is electrically connected to the output side of the second isolation transformer, and the outgoing terminal of the third circuit breaker Q2 is connected to the off-grid load output branch for supplying power to the external off-grid load.

[0030] In this embodiment, the auxiliary power system equipment also includes multiple cooling fans and an air conditioner; one end of the cooling fan is electrically connected to the environmental system, and the other end is electrically connected to the rectifier module and energy storage converter PCS cabinet; one end of the air conditioner is electrically connected to the environmental monitoring system, and the other end is electrically connected to the battery cluster.

[0031] In this embodiment, the auxiliary power system equipment further includes a fire protection system, which is electrically connected to the battery cluster.

[0032] In this embodiment, the battery cluster is composed of multiple batteries connected in series and parallel.

[0033] Specifically, this application integrates dual AC input sources—one from the grid side and the other from the inverter side of the energy storage converter PCS cabinet—by setting up an interlock circuit. This allows for automatic and seamless switching to the backup circuit powered by the energy storage converter PCS cabinet when the main power supply (such as mains power) fails or is interrupted. This ensures the continuous and stable operation of auxiliary power equipment such as the battery management system (BMS), energy management system (EMS), and environmental monitoring system, significantly improving the system's reliability and availability under emergency conditions. By organically integrating the grid, energy storage converter PCS cabinet, AC distribution cabinet, and interlock circuit through a three-phase AC bus, and combining the first isolation transformer, second isolation transformer, and intelligent control logic, smooth switching between grid-connected charging, off-grid discharging, and hybrid operation modes can be achieved, meeting the needs of various application scenarios such as microgrids, emergency power supply, and operations in areas without electricity.

[0034] The DC bus serves as the core node, connecting the battery clusters, DC distribution cabinets, energy storage converter PCS cabinets, and the DC side of the rectifier charging modules to form a centralized DC energy distribution network. This design simplifies the electrical topology, reduces line losses, improves energy transmission efficiency, and facilitates multi-device collaborative control and optimized energy scheduling.

[0035] The rectifier charging module is connected to the three-phase AC bus through the first isolation transformer, which effectively realizes electrical isolation between the grid side and the DC charging circuit, prevents fault propagation, and suppresses common-mode interference. At the same time, the DC output terminal of the energy storage converter PCS cabinet is equipped with a second isolation transformer to ensure the power safety of the off-grid load side and comply with low-voltage electrical safety specifications.

[0036] The AC distribution cabinet is equipped with a dedicated off-grid load output branch. Combined with the V / f control function of the energy storage converter PCS cabinet, it can independently build a stable AC microgrid under off-grid conditions, providing high-quality AC power to external off-grid loads (such as construction equipment, communication base stations, emergency lighting, etc.), thus expanding the application boundaries of energy storage containers.

[0037] The outgoing terminals of the first circuit breaker, QF10, are directly electrically connected to the auxiliary power system equipment, providing a stable power supply to these devices. The incoming terminals of the second circuit breaker, QF22, are electrically connected to the AC side of the three-phase AC bus, which is also indirectly connected to the grid input and the DC side of the energy storage converter PCS cabinet (through a rectifier charging module). This means that the second circuit breaker, QF22, can draw power from the three-phase AC bus, whether the power comes directly from the grid or is fed back to the three-phase AC bus after being inverted by the energy storage converter PCS cabinet. The outgoing terminals of the second circuit breaker, QF22, are also electrically connected to the auxiliary power system equipment, ensuring a seamless switch to backup power supply when the main power supply is unavailable.

[0038] The dual power supply circuit is configured to switch between different auxiliary power supply circuits based on power availability, with the first interlock contactor KM2 and the second interlock contactor KM1 following the first circuit breaker QF10 and the second circuit breaker QF22. This achieves seamless switching between the main and backup power supplies, ensuring continuous and reliable power supply to the auxiliary power system. The signal / communication terminal of the battery management system (BMS) is electrically connected to the battery clusters to collect the voltage, current, temperature, and state of charge (SOC) of each battery cluster in real time, and to achieve charge and discharge management and safety protection.

[0039] The environmental monitoring system includes temperature and humidity sensors, smoke detectors, fan controllers, and other equipment. Its power input terminal is electrically connected to the output terminal of the first circuit breaker to obtain the working power. The signal acquisition terminal of the environmental monitoring system is electrically connected to the operation status monitoring points of the battery cluster, rectifier charging module, and energy storage converter PCS cabinet, respectively, to monitor the operating temperature, environmental parameters, and abnormal status of key equipment in real time, and upload the data to the energy management system (EMS) or local controller.

[0040] The third circuit breaker Q2 is configured to provide overload protection, short-circuit protection and isolation functions for off-grid load circuits, so as to realize controllable switching and safe operation on the load side.

[0041] Through reasonable electrical topology design and control strategies, efficient coordination and flexible operation of charging and discharging circuits can be achieved.

[0042] This application employs a design where the main circuit and discharge circuit are independently isolated. The auxiliary power circuit uses dual power supplies, supporting the charging circuit (grid side) as power input and the discharge circuit (energy storage converter PCS cabinet) as power output to power the entire auxiliary power system. This design allows the energy storage container to share the same auxiliary power system when the charging and discharging circuits are operating simultaneously or independently, providing a stable power supply for auxiliary equipment such as temperature control, control, monitoring, and communication. Compared to the traditional approach of configuring independent auxiliary power systems for different operating modes, this application significantly reduces the redundant configuration of auxiliary power components, simplifies the system architecture, reduces equipment costs and space occupation, and facilitates fault diagnosis and maintenance and replacement of key components, effectively reducing production and operation costs.

[0043] During power switching, the interlock circuit and the uninterruptible power supply (UPS) work together to implement an intelligent switching control strategy, ensuring seamless power supply from the auxiliary power system when switching between charging and discharging modes. The switching time is controlled within ≤8ms, complying with the IEC 62040-3 standard, ensuring the continuous and stable operation of critical equipment such as monitoring systems and communication modules. The dual-power redundant supply combined with the uninterrupted nature of the UPS constitutes a multi-layered power supply protection mechanism, significantly improving system reliability and operational safety.

[0044] Regarding the configuration of the main power circuit, this application supports multiple implementation methods, which can be flexibly selected according to the application scenario and cost requirements:

[0045] For example, a dual-energy storage converter PCS cabinet solution involves configuring two energy storage converter PCS cabinets. One cabinet operates in grid-connected mode, connecting the grid and the battery cluster, and is responsible for controlling the charging process of the energy storage system. The other cabinet operates in off-grid mode, connecting the battery cluster and the local load, enabling independent power supply to off-grid loads (such as emergency power supplies, islanded operation, etc.). The two energy storage converter PCS cabinets construct physically isolated charging and discharging circuits, avoiding control logic conflicts and energy losses during mode switching processes that occur with a single energy storage converter PCS cabinet, thus improving system response speed and operational stability.

[0046] For example, the single energy storage converter PCS cabinet + single inverter solution uses one energy storage converter PCS cabinet to handle grid-connected charging, and another independent inverter for off-grid discharge. This achieves physical isolation between the charging and discharging circuits, balancing performance and cost.

[0047] For example, the rectifier + inverter solution: In low-cost scenarios where PCS functionality is not required, only one rectifier charging module and one inverter are configured to build independent charging and discharging circuits, achieving the simplest dual-bus architecture, significantly reducing system costs, and suitable for stationary energy storage applications with lower requirements for intelligence.

[0048] In summary, this application achieves physical isolation and power supply redundancy for charging and discharging paths by constructing a dual-bus, dual-circuit, dual-input electrical architecture, combined with the design of interlocking circuits and shared auxiliary power supply system equipment. The system not only supports flexible multi-mode configuration but also possesses comprehensive advantages such as high reliability, low cost, and ease of maintenance, making it suitable for various complex application scenarios such as microgrids, emergency power supplies, mobile energy storage, and power supply in areas without electricity.

[0049] This application adopts a standardized electrical connection architecture, which allows for flexible expansion of each functional unit (such as battery clusters, PCS, and rectifier modules), facilitating on-demand configuration of power and capacity. It is suitable for energy storage application scenarios of different scales and has good promotional value.

[0050] This application achieves a comprehensive improvement in power supply reliability, operational flexibility, energy utilization efficiency, and system security of energy storage containers through dual-circuit power supply design, AC / DC bus collaborative architecture, and intelligent linkage of multiple devices. It is especially suitable for critical power security scenarios with high requirements for power supply continuity and complex operating environments.

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An energy storage container with charging and discharging circuit isolation, characterized by, The system includes an interlock circuit for distributing AC energy and switching auxiliary power input, a DC bus, a three-phase AC bus, auxiliary power system equipment, battery clusters, a DC distribution cabinet, an energy storage converter (PCS) cabinet, an AC distribution cabinet, and a rectifier charging module. The AC distribution cabinet and interlock circuit are electrically connected to the three-phase AC bus, forming a common connection network on the AC side of the system. The power input terminal of the auxiliary power system equipment is electrically connected to the output terminal of the interlock circuit to receive AC power from the grid side or the PCS discharge circuit. The power output terminal of the auxiliary power system equipment is electrically connected to the battery clusters. The rectifier charging module is connected to the three-phase AC bus via a first isolation transformer. Furthermore, the first isolation transformer is located on the AC side between the rectifier charging module and the interlocking circuit to achieve electrical isolation and voltage matching between the grid side and the charging circuit; one end of the DC distribution cabinet is electrically connected to the battery cluster, and the other end is electrically connected to the DC input terminal of the energy storage converter PCS cabinet, forming a DC path for the discharge circuit; the DC bus is connected between the DC distribution cabinet and the energy storage converter PCS cabinet, and is electrically connected to the DC side of the DC distribution cabinet, the energy storage converter PCS cabinet, and the DC output terminal of the rectifier charging module, respectively; the AC distribution cabinet is equipped with an off-grid load output branch, which is used to supply power to external off-grid loads.

2. An energy storage container with isolated charging and discharging circuits as claimed in claim 1, characterized in that, The interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The input terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer, and the output terminal of the first circuit breaker is electrically connected to the input terminal of the second interlocking contactor. The output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The input terminal of the second circuit breaker is connected to the grid side of the three-phase AC busbar. The output terminal of the second circuit breaker is electrically connected to the input terminal of the first interlocking contactor, and the output terminal of the second interlocking contactor is electrically connected to the auxiliary power supply system equipment. The interlocking circuit includes a first circuit breaker, a second circuit breaker, a first interlocking contactor, and a second interlocking contactor. The incoming terminal of the first circuit breaker is electrically connected to the output terminal of the second isolation transformer to receive AC power output from the inverter of the energy storage converter PCS cabinet; the incoming terminal of the main contact of the second interlock contactor is connected to the outgoing terminal of the first circuit breaker, and the outgoing terminal of the main contact of the second interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system equipment; the incoming terminal of the second circuit breaker is connected to the grid side of the three-phase AC bus to connect to the external power grid; the outgoing terminal of the second circuit breaker is electrically connected to the incoming terminal of the main contact of the first interlock contactor, and the outgoing terminal of the main contact of the first interlock contactor is electrically connected to the power input terminal of the auxiliary power system equipment to supply power to the auxiliary power system when the power grid is normal.

3. An energy storage container with isolated charging and discharging circuits as claimed in claim 2, wherein, The first interlocking contactor and the second interlocking contactor are provided with an electrical interlocking and / or mechanical interlocking structure.

4. An energy storage container with isolated charging and discharging circuits as claimed in claim 3, wherein, The control circuits of the first and second interlocking contactors are connected in series with each other's normally closed auxiliary contacts to form an electrical interlocking circuit. The coil control branch of the first interlocking contactor is connected in series with the normally closed auxiliary contact of the second interlocking contactor, and the coil control branch of the second interlocking contactor is connected in series with the normally closed auxiliary contact of the first interlocking contactor. When the first contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the second contactor. When the second contactor is energized, its normally closed auxiliary contact is open, cutting off the control circuit of the first contactor, preventing both from conducting simultaneously, and realizing safe switching between power supplies and preventing parallel operation.

5. An energy storage container with isolated charge and discharge circuits as defined in claim 2, wherein, The auxiliary power system includes a battery management system, an energy management system, and an environmental monitoring system. The power input terminal of the battery management system is electrically connected to the output terminal of the first circuit breaker, and the power output terminal of the battery management system is electrically connected to the battery cluster. One end of the environmental monitoring system is electrically connected to the output terminal of the first circuit breaker, and the other end is electrically connected to the communication interfaces of the battery cluster, the rectifier charging module, and the energy storage converter PCS cabinet. The energy management system is communicatively connected to the battery management system and the environmental monitoring system.

6. An energy storage container with isolated charge and discharge circuits as claimed in claim 5, wherein, The AC distribution cabinet is equipped with a third circuit breaker. The incoming terminal of the third circuit breaker is electrically connected to the output side of the second isolation transformer, and the outgoing terminal of the third circuit breaker is connected to the off-grid load output branch for supplying power to the external off-grid load.

7. An energy storage container with isolated charge and discharge circuits as defined in claim 5, wherein, The auxiliary power system equipment also includes multiple cooling fans and an air conditioner; one end of the cooling fan is electrically connected to the environmental system, and the other end is electrically connected to the rectifier module and energy storage converter PCS cabinet; one end of the air conditioner is electrically connected to the environmental monitoring system, and the other end is electrically connected to the battery cluster.

8. An energy storage container with charging and discharging circuit isolation as claimed in claim 1, characterized in that, The auxiliary power system equipment also includes a fire protection system, which is electrically connected to the battery cluster.

9. An energy storage container with charging and discharging circuit isolation as claimed in claim 8, wherein, The battery cluster is composed of multiple batteries connected in series and parallel.

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