Container type energy storage system

Abstract

The utility model discloses a container type energy storage system, and relates to the technical field of energy storage systems. The energy storage system comprises a box body, a battery system, a direct current confluence cabinet, an energy storage converter and an energy management system; wherein the battery system is connected with the energy storage converter through the direct current confluence cabinet, and alternating current output by the energy storage converter is connected to a power grid after confluence at a grid-connected point; a liquid cooling unit is also arranged in the box body, and the liquid cooling unit is connected with the battery system; an exhaust fan is arranged on the right side in the box body and used for discharging heat generated in the box body out of the box. According to the utility model, the mode of wiring in the container is adopted, the field installation process is simplified, the liquid cooling heat dissipation mode is adopted, the heat dissipation efficiency is high, the heat distribution is uniform, the conversion efficiency of the battery core is improved, and the service life of the battery core is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and more specifically to a containerized energy storage system. Background Art

[0002] With the development of renewable energy and the increasing demand for intelligent power systems, energy storage technology plays a crucial role in power dispatch, energy management, and load regulation. Existing energy storage systems need improvement in terms of integration, footprint, energy efficiency management, and safety. This is especially true for high-power energy storage systems, where traditional air cooling methods struggle to meet the demands for high efficiency and safety, posing numerous challenges in safety management and thermal control. Existing containerized energy storage systems often employ separate arrangements for battery systems and energy storage converters, leading to complex on-site installations and requiring careful consideration of site layout and cable routing between the battery system and the energy storage converter. If cable trenches are unavailable, proper and compliant cable routing is essential for long-term reliable operation. Most battery systems utilize air cooling, which is inefficient for high-density battery distribution, resulting in excessively high cell temperatures and reduced internal electrochemical conversion efficiency. Furthermore, uneven cell temperature distribution leads to decreased cell consistency. Therefore, providing an integrated, compact energy storage system with efficient cooling and fire safety features is of significant importance. Utility Model Content

[0003] In view of this, the present invention provides a containerized energy storage system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a containerized energy storage system, comprising a container, a battery system, a DC combiner cabinet, an energy storage converter, and an energy management system; wherein, the battery system is connected to the energy storage converter through the DC combiner cabinet, and the AC power output by the energy storage converter is combined at the grid connection point and then connected to the power grid; the battery system, the DC combiner cabinet, and the energy storage converter are all connected to the energy management system.

[0005] Preferably, the container is a standard 20-foot shipping container, and the containerized energy storage system is integrated into the container.

[0006] Preferably, the battery system includes multiple battery clusters, each battery cluster being composed of multiple battery modules, and each battery module being composed of battery cells.

[0007] Preferably, a liquid cooling unit is also provided inside the housing. The liquid cooling unit is connected to the battery system. A heat spreader is arranged below each battery module, including a water inlet and a water outlet. Cold water flows into the water inlet and hot water flows out of the water outlet. The water pump of the liquid cooling unit is used to flow the hot water from the pipeline into the heat dissipation part of the unit and send the cooled water back to the heat spreader.

[0008] Preferably, an exhaust fan is provided on the right side inside the box to exhaust the heat generated inside the box to the outside.

[0009] Preferably, it also includes a fire safety system, which is installed on top of the battery cluster and includes a smoke detector, a temperature sensor, a combustible gas detector, and an automatic fire extinguishing system.

[0010] Preferably, the automatic fire extinguishing system includes aerosol fire suppression and water fire suppression.

[0011] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a containerized energy storage system, which has the following beneficial technical effects:

[0012] 1. Integrated design is achieved; the battery, inverter, energy management system, cooling system and fire protection system are highly integrated into a 20-foot container, which reduces the system installation and commissioning time and facilitates transportation and deployment.

[0013] 2. High-efficiency heat dissipation; the liquid cooling system improves heat dissipation efficiency, effectively preventing system failures caused by overheating, and improving system reliability and lifespan.

[0014] 3. High safety: The system is equipped with comprehensive fire safety equipment, which can automatically respond in the event of fire or other abnormal situations to ensure the safety of the system and the surrounding environment.

[0015] 4. Flexibility: Supports grid-connected and off-grid operation modes, suitable for various application scenarios such as power peak shaving, renewable energy grid connection and industrial and commercial energy storage. It can meet the power system's demand for flexible energy storage and has significant advantages in improving energy efficiency, ensuring system security and ease of deployment. It is suitable for energy storage applications in various scenarios. Attached Figure Description

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the system structure of this utility model;

[0018] Figure 2 This is a primary wiring diagram of the system of this utility model;

[0019] Figure 3 This is a system layout diagram of the present invention;

[0020] Figure 4 This is a flowchart of the fire safety system connection of this utility model.

[0021] Among them, 1 is a DC combiner cabinet, 2 is an energy storage converter, 3 is the first battery cluster, 4 is the second battery cluster, 5 is the third battery cluster, 6 is the fourth battery cluster, 7 is the battery system, 8 is the liquid cooling unit, 9 is the dehumidifying air conditioner, 10 is the exhaust fan, and 11 is the automatic fire extinguishing system. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] This utility model discloses a containerized energy storage system, such as Figure 1 As shown, the system includes a housing, a battery system 7, a DC combiner cabinet 1, an energy storage converter 2, and an energy management system. The battery system 7 is connected to the energy storage converter 2 via the DC combiner cabinet 1. The AC power output from the energy storage converter 2 is combined at the grid connection point and then connected to the power grid. The battery system 7, DC combiner cabinet 1, and energy storage converter 2 are all connected to the energy management system. The housing is a standard 20-foot shipping container, and the containerized energy storage system is integrated within the container.

[0024] The primary function of battery energy storage is to store (charge) and release (discharge) electrical energy through electrochemical reactions. A battery system has a positive electrode (BAT+) and a negative electrode (BAT-), and the electrical energy is direct current (DC), while the power grid provides three-phase alternating current (L1, L2, L3). The power conversion converter (PCS) enables the conversion between DC and AC, allowing the battery energy storage system to exchange energy with the grid. The combination of PCS power and battery system capacity configurations results in a system with a small footprint and high energy density.

[0025] The container contains two identical systems, whose output AC power is connected to the power grid at the grid connection point. For example... Figure 2As shown, each system consists of a battery system 7 (rated capacity 860kWh), a DC combiner cabinet 1, and an energy storage converter 2 (rated power 500kW). Each battery system contains four battery clusters: the first cluster 3, the second cluster 4, the third cluster 5, and the fourth cluster 6. Each cluster consists of five battery modules, and each module consists of 48 cells. The two systems together comprise 1MW / 1.72MWh.

[0026] Furthermore, the energy management system integrates information acquisition and system control functions, fulfilling various application requirements based on actual usage scenarios. By collecting information from devices such as batteries and energy storage converters, the energy management system can determine whether the current operating status meets the corresponding operating conditions. If not, the system cannot operate, requiring troubleshooting and maintenance based on alarms or protection status. If the conditions are met, the energy storage converter can charge and discharge the battery according to a preset operating strategy. It should be noted that the energy management system is a hardware structure.

[0027] An energy management system includes: a communication unit that supports communication with other devices (such as smart meters, battery systems, energy storage converters, etc.), using common protocols such as Modbus and TCP / IP; a control unit, a processor or controller responsible for executing control algorithms and processing data, typically an embedded system; a display that provides real-time data and system status information; a control panel or touchscreen that users can use to operate and configure the system; network and communication equipment, including routers or switches, for connecting the system to external networks; and security and monitoring equipment, including a firewall to ensure network security and surveillance cameras (optional) for monitoring the physical status and security of the equipment.

[0028] Furthermore, such as Figure 3 As shown, a liquid cooling unit 8 is also installed inside the casing. The liquid cooling unit 8 is connected to the battery system 7. A heat spreader is arranged below each battery module, including an inlet and an outlet. Cold water flows in through the inlet, and hot water flows out through the outlet. The water pump of the liquid cooling unit 8 is used to pump the hot water from the pipes into the heat dissipation part of the unit and send the cooled water back to the heat spreader. During the charging and discharging process of the battery, the temperature of the battery cell will rise accordingly. When a certain temperature is reached, the liquid cooling unit 8 will start. The water pump will circulate the coolant in the water-cooled plate between the battery modules and finally flow back to the unit. The fan in the unit will quickly dissipate the heat in the coolant. During this process, due to the temperature difference, condensation will occur, and the dehumidifier 9 will automatically operate. This utility model adopts a liquid cooling heat dissipation method, which has high heat dissipation efficiency and uniform heat distribution, thereby improving the cell conversion efficiency and extending the cell life.

[0029] The energy storage converter (PCS) also generates a certain amount of heat during operation. An exhaust fan 10 is installed on the right side of the enclosure to exhaust the heat generated inside the enclosure to the outside.

[0030] Furthermore, it also includes a fire safety system, which includes smoke detectors, temperature sensors, combustible gas detectors, and an automatic fire extinguishing system 11. The automatic fire extinguishing system 11 includes aerosol fire suppression and water fire suppression. Figure 4 As shown, smoke detectors, heat detectors, and gas sensors in the fire protection system will trigger alarms and cut off the system power supply to prevent accidents. If an accident occurs too quickly and a fire breaks out, aerosol and water fire suppression can effectively extinguish the fire, ensuring the safety of the system.

[0031] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A containerized energy storage system, characterized in that, The system includes a housing, a battery system, a DC combiner cabinet, an energy storage converter, and an energy management system. The battery system is connected to the energy storage converter via the DC combiner cabinet, and the AC power output from the energy storage converter is combined at the grid connection point and then connected to the power grid. The battery system, the DC combiner cabinet, and the energy storage converter are all connected to the energy management system. The battery system includes multiple battery clusters, each battery cluster is composed of multiple battery modules, and each battery module is composed of battery cells; A liquid cooling unit is also installed inside the box. The liquid cooling unit is connected to the battery system. A heat spreader is arranged below each battery module, including a water inlet and a water outlet. Cold water flows into the water inlet and hot water flows out of the water outlet. The water pump of the liquid cooling unit is used to flow the hot water from the pipeline into the heat dissipation part of the unit and send the cooled water back to the heat spreader. An exhaust fan is installed on the right side inside the enclosure to dissipate the heat generated inside the enclosure to the outside.

2. The containerized energy storage system according to claim 1, characterized in that, The container is a standard 20-foot shipping container, and the containerized energy storage system is integrated into the container.

3. The containerized energy storage system according to claim 1, characterized in that, It also includes a fire safety system, which is installed on top of the battery cluster and includes a smoke detector, a temperature sensor, a combustible gas detector, and an automatic fire extinguishing system.

4. A containerized energy storage system according to claim 3, characterized in that, The automatic fire extinguishing system includes aerosol fire suppression and water fire suppression.

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