Energy storage integrated cabinet

Abstract

The utility model discloses an energy storage integrated cabinet, which comprises an alternating current confluence cabinet and N energy storage branch cabinets, each energy storage sub-cabinet is connected with a power grid and an electricity load through an alternating current confluence cabinet; the alternating current confluence cabinet comprises an iEMS, and a switch, an electric energy meter, a main circuit breaker and N branch circuit breakers which are respectively connected with the iEMS; one end of each of the N branch circuit breakers is connected with one end of the main circuit breaker, one end of the main circuit breaker is used for connecting a power grid and a load, and the other end of each of the N branch circuit breakers is correspondingly connected with one energy storage branch cabinet; the input end of the electric energy meter is connected between the main circuit breaker and the N branch circuit breakers; each energy storage sub-cabinet comprises an energy storage battery, a BMS, a PCS, an energy storage electric meter and a communication interface; the BMS, the PCS and the energy storage ammeter are all connected with the communication interface, and the communication interface is further connected with the switch; the alternating-current end of the PCS is connected with the other end of one branch circuit breaker of the alternating-current confluence cabinet, and the direct-current end of the PCS is connected with the energy storage battery; and the BMS is connected with the energy storage battery.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an integrated energy storage cabinet. Background Art

[0002] Energy storage devices are used in many situations to meet specific load requirements, such as providing stable power output in grid-connected mode. The load status of the battery pack can be managed by the host and other devices. In certain situations or time periods, a single energy storage device cannot meet the load requirements due to its limited capacity. When the original energy storage capacity increases, multiple devices need to be connected in parallel, and modular expansion is achieved through AC coupling to achieve the rated power that meets the load requirements. However, the existing structure of multiple devices connected in parallel is unreasonable, resulting in inaccurate data collection for energy management. Utility Model Content

[0003] The purpose of the utility model is to provide an integrated energy storage cabinet, which can effectively solve the above-mentioned technical problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides an energy storage integrated cabinet, which includes an AC combiner cabinet and N energy storage sub-cabinets; each energy storage sub-cabinet is connected to the power grid and the power load through the AC combiner cabinet; the AC combiner cabinet includes an iEMS and a switch, an electric energy meter, a main circuit breaker and N sub-circuit breakers respectively connected to the iEMS; one end of the N sub-circuit breakers is connected to one end of the main circuit breaker, one end of the main circuit breaker is used to connect the power grid and the load, and the other end of the N sub-circuit breakers is connected to the main circuit breaker. Each of the energy storage cabinets is connected to a corresponding energy storage cabinet; the input end of the energy meter is connected between the main circuit breaker and the N sub-circuit breakers; each of the energy storage cabinets includes an energy storage battery, a BMS, a PCS, an energy storage meter and a communication interface; the BMS, the PCS and the energy storage meter are all connected to the communication interface, and the communication interface is also connected to the switch; the AC end of the PCS is connected to the other end of a sub-circuit breaker of the AC junction cabinet, and the DC end of the PCS is connected to the energy storage battery; the BMS is connected to the energy storage battery.

[0005] As an improvement of the above solution, the communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to an interface of the switch, and the multiple serial ports are used to connect to the BMS, PCS and energy storage meter respectively.

[0006] As an improvement of the above solution, the AC combiner cabinet further includes a display screen connected to the iEMS; each of the energy storage cabinets further includes a fire protection component connected to the communication interface.

[0007] As an improvement of the above solution, each of the energy storage cabinets also includes a humidity sensor and a dehumidifier connected to the communication interface.

[0008] As an improvement of the above solution, each of the energy storage cabinets also includes a water immersion sensor connected to the communication interface.

[0009] As an improvement of the above solution, each of the energy storage cabinets also includes a liquid cooler connected to the BMS.

[0010] As an improvement of the above solution, the energy storage battery includes M battery modules connected in series, and each battery module is connected to a corresponding BMU.

[0011] As an improvement of the above solution, the AC combiner cabinet is also connected to a UPS as a peripheral device, and the UPS is used to supply power to the main equipment of the AC combiner cabinet and the energy storage cabinet when the city power is cut off.

[0012] As an improvement of the above solution, N is less than or equal to 5.

[0013] Compared with the prior art, the energy storage integrated cabinet provided by the embodiment of the utility model controls N energy storage cabinets by a total iEMS independently set in the AC junction cabinet, so that the iEMS can communicate with each energy storage cabinet through a switch. The structure is more reasonable and concise, and can have the following technical effects: (1) reducing the cost of setting up an EMS separately for each energy storage cabinet; (2) the power information of each energy storage cabinet is directly sent to the iEMS for unified energy regulation, instead of being calculated and processed by each EMS and then sent to the background monitoring for scheduling. In this way, the power information obtained is more direct and accurate, thereby improving the accuracy of energy scheduling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of an energy storage integrated cabinet provided in an embodiment of the utility model.

[0016] Figure 2 It is a structural schematic diagram of an energy storage sub-cabinet of an energy storage integrated cabinet provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The following is an explanation of some of the terms involved in the embodiments of the present invention:

[0022] BMS: Battery management system, mainly used to monitor the operating status of each battery in the battery energy storage unit to ensure the safe and reliable operation of the energy storage unit. BMS can monitor and collect the state parameters of the energy storage battery in real time (including but not limited to the voltage of the single cell, the temperature of the battery pole, the battery loop current, the terminal voltage of the battery pack, the insulation resistance of the battery system, etc.), and perform necessary analysis and calculation on the relevant state parameters to obtain more system state evaluation parameters, and realize effective control of the energy storage battery body according to specific protection and control strategies to ensure the safe and reliable operation of the entire battery energy storage unit. At the same time, BMS can exchange information with other external devices (PCS, EMS, fire protection system, etc.) through its own communication interface, analog / digital input / output interface, and form a linkage control of each subsystem in the entire energy storage power station to ensure the safe, reliable and efficient grid-connected operation of the power station. In addition, BMS also has the following functions: safe management of batteries, alarm and emergency protection processing of possible faults; safe and optimized control of the operation of battery modules and battery clusters to ensure safe, reliable and stable operation of batteries.

[0023] BCU: Battery Cluster Management Unit, a device used to manage and control battery clusters. It is mainly responsible for monitoring the status and performance of the battery cluster, and performing charging and discharging control as needed to ensure the safe and reliable operation of the battery cluster. BCU understands the status of the battery in real time by monitoring parameters such as voltage, temperature and current of each single battery in the battery cluster. It uses sensors to collect this data and sends it to the control unit for data processing and analysis. Based on this data, BCU can judge the performance and status of the battery and take corresponding measures for management and control. In addition to monitoring and control functions, BCU also has other advanced functions such as battery power management, battery balancing management, thermal management and fault diagnosis. These functions can improve the efficiency and life of the battery cluster while ensuring its safe and reliable operation.

[0024] BMU: Battery Management Unit, it is a system for managing battery modules, which can detect the battery status (voltage, temperature, etc.) and provide a communication interface for the battery. The main functions of BMU include: BMU can monitor the battery voltage, current, temperature and other parameters in real time, and send these data to other devices for data processing and analysis; BMU can protect the battery from damage such as overcharge, over discharge, overcurrent, etc., and extend the battery life; BMU can provide an interface for communication with other devices (such as charging piles, energy management systems, etc.) to achieve data sharing and interaction; BMU can reasonably control the battery charging and discharging process according to the battery's state of charge and operating conditions, and improve energy efficiency.

[0025] Among them, BMS is the management of the entire energy storage system, which covers the management of battery cells, battery packs, battery clusters and the entire battery system. At the bottom level, BMS monitors and collects battery operation information in real time through BMU, such as temperature, voltage, current, SOC (state of charge capacity) and SOH (state of health). BMU transmits monitoring data to BMS through the communication interface with BMS. After BMS processes and analyzes the data, it controls the charging and discharging process of the battery according to the set parameters to ensure operation within a safe range. At the same time, BMS can also respond to and control various changes and abnormal conditions in the charging and discharging process in a timely manner through the coordination between the units to achieve comprehensive management and protection of the battery pack.

[0026] BCU is a part of BMS, which manages the individual battery clusters integrated in the battery pack. BCU is composed of several battery modules and circuit equipment (monitoring and protection circuits, electrical and communication interfaces, and thermal management devices, etc.) connected by circuits. It can control the charging and discharging process of multiple battery modules and monitor their status. BCU realizes information exchange through the communication interface with BMU, and monitors and adjusts the status and performance of the battery cluster in real time. When abnormal information is detected, BCU can command BMU to perform corresponding operations to achieve precise control.

[0027] In summary, in the energy storage system, BMS is the highest-level management system, which covers the management from battery cells to the entire battery system. BCU is a part of BMS, focusing on the management of battery clusters. BMU is a lower-level device, responsible for real-time monitoring and collection of battery operation information, and transmitting this data to the upper-level management system for data processing and analysis. The three work together to ensure the safe, efficient and reliable operation of the energy storage system.

[0028] PCS: Energy storage converter, also known as bidirectional energy storage inverter. It is the core component for realizing bidirectional flow of electric energy between the energy storage system and the power grid. It is used to control the charging and discharging process of the battery and perform AC / DC conversion. The main functions of PCS include: constant power or constant current control according to the microgrid monitoring instructions, charging or discharging the battery, and smoothing the output of wind power and photovoltaic power with strong volatility.

[0029] EMS: Energy management system, which can realize real-time monitoring and intelligent management of each device in the system. EMS can realize data collection, storage, processing, uploading, operation control, operation strategy formulation, etc., and carry out overall information-based monitoring and management.

[0030] refer to Figure 1 The embodiment of the utility model provides an integrated energy storage cabinet, including an AC combiner cabinet 10 and N energy storage cabinets 20. Each energy storage cabinet 20 is connected to a power grid and an electrical load through the AC combiner cabinet 10.

[0031] Specifically, the AC junction cabinet 10 includes an iEMS and a switch, an energy meter, a main circuit breaker and N sub-circuit breakers respectively connected to the iEMS. One end of the N sub-circuit breakers is connected to one end of the main circuit breaker (through an AC line), one end of the main circuit breaker is used to connect the power grid and the load, and the other ends of the N sub-circuit breakers are respectively connected to a corresponding energy storage cabinet 20. The input end of the energy meter is connected between the main circuit breaker and the N sub-circuit breakers, and is used to collect the total power information of the energy storage cabinet discharging to the power grid or charging from the power grid in the grid-connected mode and discharging to the load in the off-grid mode.

[0032] refer to Figure 2 Each of the energy storage cabinets 20 includes an energy storage battery, a BMS, a PCS, an energy storage meter and a communication interface. The BMS, PCS and energy storage meter are all connected to the communication interface. The communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to an interface of the switch, and the multiple serial ports are used to connect to the BMS, PCS and energy storage meter respectively. The network interface adopts an RJ45 interface and the serial port adopts RS485.

[0033] The PCS is used to achieve AC / DC conversion. The AC end of the PCS is connected to the other end of a circuit breaker of the AC junction cabinet 10, and the DC end of the PCS is connected to the energy storage battery. The PCS receives the control instruction of the iEMS through the communication interface, and charges or discharges the energy storage battery according to the control instruction. The BMS connects to the energy storage battery to obtain the status information of the energy storage battery, and sends the acquired status information of the energy storage battery to the iEMS through the communication interface. The energy storage meter is used to collect the electric energy information of the corresponding energy storage cabinet discharging to the grid or charging from the grid in the grid-connected mode and discharging to the load in the off-grid mode, and sends it to the iEMS through the communication interface.

[0034] It can be understood that the energy storage battery includes M battery modules connected in series, each battery module is connected to a corresponding BMU, and each BMU is responsible for collecting and managing the voltage, current, and temperature information of the single battery cell and uploading it to the BMS, and managing the single battery in the module to realize the single battery balancing function.

[0035] In the embodiment of the present invention, N is less than or equal to 5, and M is greater than or equal to 2.

[0036] For further reference, Figure 1 and Figure 2, the AC combiner cabinet 10 also includes a display screen connected to the iEMS. Each of the energy storage cabinets 20 also includes a fire protection component connected to the communication interface, the fire protection component is used to monitor the use status of each energy storage cabinet and generate a corresponding fire protection message to send to the iEMS; the iEMS performs the following operations according to the received fire protection message:

[0037] When the fire message is a first-level fire warning, the iEMS generates a fault alarm, sends it to the terminal APP through the cloud server, and displays it on the display screen;

[0038] When the fire message is a second-level fire warning, the iEMS generates a fault alarm, sends it to the terminal APP through the cloud server, displays it on the display screen, and executes the power-off strategy.

[0039] The power-off strategy includes:

[0040] Request the PCS to reduce power to 0. If there are other power devices, the power must also be limited to 0.

[0041] Request the PCS to shut down, the air conditioner to shut down, and if there are other peripherals that need to be controlled, send a shutdown command;

[0042] Control the BMS to power off. After the BMS determines that the loop current is less than 5A, it executes the power-off command.

[0043] Furthermore, each of the energy storage cabinets 20 also includes a humidity sensor and a dehumidifier connected to the communication interface. The humidity sensor is used to collect humidity data in the energy storage cabinet and send it to the iEMS through the communication interface. The iEMS controls the operation of the corresponding dehumidifier according to the received humidity data.

[0044] Furthermore, each of the energy storage sub-cabinets 20 also includes a water immersion sensor connected to the communication interface, and the humidity sensor is used to collect water immersion data in the energy storage sub-cabinet and send it to the iEMS through the communication interface. When the iEMS determines that the energy storage sub-cabinet is flooded based on the received water immersion data, it issues a water immersion alarm and controls the equipment of the corresponding energy storage sub-cabinet to cut off power.

[0045] Furthermore, each of the energy storage cabinets 20 also includes a liquid cooler connected to the BMS, and the BMS is also used to obtain temperature data of the energy storage battery. When the temperature data of the energy storage battery obtained by the BMS is greater than a first temperature threshold, the liquid cooler is controlled to operate to cool the energy storage cabinet and the energy storage battery.

[0046] Furthermore, the BMS is also used to send the acquired temperature data of the energy storage battery to the iEMS through the communication interface. When the temperature data of the energy storage battery is greater than a second temperature threshold, the iEMS generates a control instruction for adjusting the power of the PCS to limit power output, thereby reducing temperature rise.

[0047] Understandable, such as Figure 1 As shown, the AC combiner cabinet 10 is also connected to a UPS as a peripheral device, and the UPS is used to supply power to the main equipment of the AC combiner cabinet 10 and the energy storage cabinet 20 when the city power is cut off.

[0048] In summary, the embodiment of the utility model provides an integrated energy storage cabinet, which controls N energy storage cabinets by independently setting up a total iEMS in the AC junction cabinet, so that the iEMS can communicate with each energy storage cabinet through a switch. The structure is more reasonable and concise, and can have the following technical effects: (1) reducing the cost of setting up an EMS for each energy storage cabinet separately; (2) the power information of each energy storage cabinet is directly sent to the iEMS for unified energy regulation, instead of being calculated and processed by each EMS and then sent to the background monitoring for scheduling. In this way, the power information obtained is more direct and accurate, thereby improving the accuracy of energy scheduling.

[0049] The above disclosures are only some preferred embodiments of the present invention, which certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. An integrated energy storage cabinet, characterized in that: It comprises an AC junction cabinet and N energy storage cabinets; each energy storage cabinet is connected to the power grid and the power load through the AC junction cabinet; the AC junction cabinet comprises an iEMS and a switch, an energy meter, a main circuit breaker and N sub-circuit breakers respectively connected to the iEMS; one end of the N sub-circuit breakers is connected to one end of the main circuit breaker, one end of the main circuit breaker is used to connect the power grid and the load, and the other end of the N sub-circuit breakers is respectively connected to an energy storage cabinet; the input end of the energy meter is connected between the main circuit breaker and the N sub-circuit breakers; each of the energy storage cabinets comprises an energy storage battery, a BMS, a PCS, an energy storage meter and a communication interface; the BMS, the PCS and the energy storage meter are all connected to the communication interface, and the communication interface is also connected to the switch; the AC end of the PCS is connected to the other end of a sub-circuit breaker of the AC junction cabinet, and the DC end of the PCS is connected to the energy storage battery; the BMS is connected to the energy storage battery.

2. The energy storage integrated cabinet according to claim 1, characterized in that: The communication interface is a serial port server, which includes a network interface and multiple serial ports. The network interface is used to connect to an interface of the switch, and the multiple serial ports are used to connect to the BMS, PCS and energy storage meter respectively.

3. The energy storage integrated cabinet according to claim 1, characterized in that: The AC combiner cabinet further includes a display screen connected to the iEMS; each of the energy storage cabinets further includes a fire protection component connected to the communication interface.

4. The energy storage integrated cabinet according to claim 1, characterized in that: Each of the energy storage cabinets also includes a humidity sensor and a dehumidifier connected to the communication interface.

5. The energy storage integrated cabinet according to claim 1, characterized in that: Each of the energy storage cabinets also includes a water immersion sensor connected to the communication interface.

6. The energy storage integrated cabinet according to claim 1, characterized in that: Each of the energy storage cabinets also includes a liquid cooler connected to the BMS.

7. The energy storage integrated cabinet according to claim 1, characterized in that: The energy storage battery includes M battery modules connected in series, and each battery module is connected to a corresponding BMU.

8. The energy storage integrated cabinet according to claim 1, characterized in that: The AC combiner cabinet is also connected to a UPS as a peripheral device, and the UPS is used to supply power to the main equipment of the AC combiner cabinet and the energy storage cabinet when the city power is cut off.

9. The energy storage integrated cabinet according to claim 1, characterized in that: N is less than or equal to 5.

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