An energy storage system high voltage tank comprising an ac access

Abstract

The application discloses a high-voltage box of an energy storage system with AC access, and belongs to the technical field of energy storage systems. The high-voltage box comprises a box body, a DC side loop, an AC side loop and a battery management system arranged in the box body. In the DC side loop, a DC circuit breaker, a DC fuse and a DC contactor are sequentially connected between a positive electrode of a battery pack and an external positive electrode terminal, and the DC circuit breaker, the DC fuse and a shunt are sequentially connected between a negative electrode of the battery pack and an external negative electrode terminal. In the AC side loop, an AC fuse, an AC contactor and an AC circuit breaker are sequentially connected between a PCS AC side output and an external three-phase four-wire electric. The box body is provided with a DC circuit breaker switch knob and an AC circuit breaker switch knob at the front part. The battery management system is connected with switch state output ends of the DC contactor, the AC contactor, the DC circuit breaker and the AC circuit breaker, and is used for monitoring a battery state and controlling on-off of the loops. The application realizes centralized management of AC and DC loops and is safe and reliable.

Description

Technical Field

[0001] This invention belongs to the field of energy storage system technology, specifically a high-voltage box for an energy storage system that includes AC access. Background Technology

[0002] Energy storage systems play a crucial role in the large-scale integration and consumption of renewable energy, smart grids, and the energy internet, enhancing the safety, flexibility, and reliability of power system operation. The high-voltage box of an energy storage system is a high-voltage power circuit control and management unit designed specifically for energy storage systems, connecting the battery clusters and the PCS (energy storage converter).

[0003] In existing technologies, high-voltage box solutions mainly focus on the management and protection of the DC side circuits, such as overcurrent and short-circuit protection and on / off control of battery cluster charging and discharging. However, these solutions rarely involve centralized management and control of the DC and AC side high-voltage circuits. In practical energy storage systems, the AC side (such as PCS AC output and grid connection) also requires protection and control. Using independent equipment would increase system complexity and cost, and would be detrimental to integrated management. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage box for an energy storage system that includes AC access, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage box for an energy storage system including AC access, comprising:

[0006] Box;

[0007] DC-side circuit and AC-side circuit are installed inside the enclosure;

[0008] And, a battery management system installed inside the enclosure;

[0009] The DC-side circuit includes a positive electrical circuit and a negative electrical circuit;

[0010] In the positive electrical circuit, a DC circuit breaker, a DC fuse, and a DC contactor are connected sequentially between the positive terminal of the battery pack and the external positive terminal.

[0011] In the negative electrical circuit, a DC circuit breaker, a DC fuse, and a shunt are connected sequentially between the negative terminal of the battery pack and the external negative terminal.

[0012] In the AC side circuit, the AC fuse, AC contactor and AC circuit breaker are connected in sequence between the PCS AC side output and the external three-phase four-wire power supply.

[0013] The front of the enclosure is equipped with a DC circuit breaker switch knob and an AC circuit breaker switch knob.

[0014] The battery management system is connected to the DC contactor, the AC contactor, the DC circuit breaker, and the switch status output terminals of the AC circuit breaker, respectively, and is used to monitor the battery status and control the on / off state of the DC and AC circuits.

[0015] As a further preferred embodiment of this technical solution: the shunt is connected to a measurement circuit for measuring the main circuit current and feeding it back to the battery management system.

[0016] As a further preferred embodiment of this technical solution: in the AC side circuit:

[0017] One side of the AC fuse is connected to the AC output cable of the PCS, and the other side is connected to the AC contactor;

[0018] An AC fuse is connected to one side of the AC contactor, and an AC circuit breaker is connected to the other side.

[0019] The AC circuit breaker is connected to the AC contactor via terminals and outputs three-phase four-wire power to the outside.

[0020] As a further preferred embodiment of this technical solution, it also includes a low-voltage side circuit, which includes: a 24V power supply, a serial port controller, a communication management unit, a micro meter, a low-voltage side fuse, a miniature fuse, and a miniature circuit breaker.

[0021] The 24V power supply is connected to an external 220V power supply, and its output terminals are respectively connected to the power supply terminals of the battery management system, serial port controller and communication management unit;

[0022] The micrometer is used to measure the active energy of the energy storage system during charging and discharging.

[0023] The low-voltage side fuses, miniature fuses, and micro-circuit breakers are used for short-circuit overcurrent protection and backup protection of the energy storage system.

[0024] As a further preferred embodiment of this technical solution: the DC side circuit is further provided with a DC relay and an aluminum-cased resistor; the aluminum-cased resistor is connected in parallel with the coil of the DC contactor.

[0025] As a further preferred embodiment of this technical solution: the battery management system is also connected to sensors for detecting battery pack voltage, current, temperature and SOC, and is provided with a communication interface for data interaction with the EMS system.

[0026] As a further preferred embodiment of this technical solution: the positive and negative terminals of the DC circuit breaker are respectively connected to the positive and negative terminals of the battery pack via positive and negative cables; a voltage detection line for feeding back the test system voltage information to the battery management system is connected between the DC circuit breaker and the DC fuse.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. In this invention, the high-voltage circuit management of the DC side and AC side is integrated in the same high-voltage box, realizing unified protection and control of the battery cluster and the AC side of the PCS; the structure is compact, the functional partitions are clear, the configuration is flexible, safe and reliable, and easy to maintain; the battery management system centrally monitors the battery status and controls the on / off of the AC and DC circuits, improving the integration and intelligence level of the energy storage system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the internal layout of electrical components in a high-voltage box of an energy storage system including AC access, according to the present invention.

[0030] Figure 2 This is a schematic diagram of one and two sides of a high-voltage box of an energy storage system including AC access according to the present invention;

[0031] Figure 3 This is a schematic diagram of the DC side electrical circuit of a high-voltage box for an energy storage system including AC access, according to the present invention.

[0032] Figure 4 This is a schematic diagram of the AC side electrical circuit of a high-voltage box for an energy storage system including AC access, according to the present invention.

[0033] Legend:

[0034] 1. DC circuit breaker switch knob; 11. DC circuit breaker; 12. DC fuse; 13. DC contactor; 14. DC relay; 15. Aluminum-cased resistor; 16. Shunt; 2. AC circuit breaker switch knob; 21. AC circuit breaker; 22. AC contactor; 23. AC fuse; 3. Battery management system; 31. Serial port controller; 32. Communication management unit; 331. Miniature meter; 332. Low-voltage side fuse; 333. Miniature circuit breaker; 34. 24V power supply; 35. Miniature fuse; 41. Handle mounting hole; 5. Removable maintenance window. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example

[0037] Please see Figure 1- Figure 4 As shown, the present invention provides a technical solution: a high-voltage box for an energy storage system with AC access, the overall dimensions of which are 900mm×800mm×280mm. The interior is divided into a DC side circuit area, an AC side circuit area, and a low-voltage control area. The front of the box is equipped with a DC circuit breaker switch knob 1 and an AC circuit breaker switch knob 2 for easy operation. One side of the box is equipped with a carrying handle fixing hole 41 and a detachable maintenance window 5 for easy handling and maintenance. The rear of the box is equipped with a battery management system 3, a serial port controller 31, a communication management unit 32, a micrometer 331, a low-voltage side fuse 332, and a microcircuit breaker 333, and is equipped with guide rails for fixing the micrometer 331 and the microcircuit breaker 333.

[0038] DC side circuit: The main positive terminal of the battery pack is connected to the positive terminal of the DC circuit breaker 11, then to the DC contactor 13 via the DC fuse 12, and finally to the external main positive terminal, forming a positive electrical circuit. The main negative terminal of the battery pack is connected to the negative terminal of the DC circuit breaker 11, then to the shunt 16 via the DC fuse 12, and finally to the external main negative terminal, forming a negative electrical circuit. The switching status of the DC circuit breaker 11 is uploaded to the battery management system 3. The on / off state of the DC contactor 13 is controlled by the battery management system 3, and its on / off information is also uploaded to the battery management system 3. A voltage detection line is also provided between the DC circuit breaker 11 and the DC fuse 12 to feed back the system voltage information to the battery management system 3. A measurement line is connected in parallel to the shunt 16 to feed back the main circuit current to the battery management system 3.

[0039] AC side circuit: The three-phase four-wire power output from the AC side of the PCS is first connected to the AC fuse 23, then to the AC contactor 22, then to the AC circuit breaker 21, and finally output to the external three-phase four-wire power. The coil of the AC contactor 22 is controlled by the battery management system 3 to connect or disconnect the AC power supply. The switching status of the AC circuit breaker 21 is uploaded to the battery management system 3.

[0040] Low-voltage side circuit: 24V power supply 34 is connected to an external 220V power supply, and outputs 24V power supply 34 to power the battery management system 3, serial port controller 31, and communication management unit 32. Miniature meter 331 is connected in series on the AC side or DC side to measure the active energy of the energy storage system during charging and discharging. Low-voltage side fuse 332, miniature fuse 35 and miniature circuit breaker 333 serve as low-voltage circuit protection elements to realize short circuit, overcurrent protection and backup protection.

[0041] Control and Management: The battery management system 3 uses sensors to detect parameters such as battery pack voltage, current, temperature, and SOC to intelligently manage and maintain the battery pack, preventing overcharging, over-discharging, and overheating, and performing thermal management and battery balancing. The battery management system 3 also interacts with the EMS system through a communication interface to report operating status and receive control commands. When an abnormality is detected, the battery management system 3 can control the DC contactor 13, or control the AC contactor 22 to disconnect, or control both to disconnect simultaneously, to cut off the corresponding circuit and achieve protection.

[0042] In this embodiment, the aluminum-cased resistor 15 is connected in parallel with the coil of the DC contactor 13 to absorb the reverse induced electromotive force generated when the coil is turned off, thus protecting the circuit.

[0043] Other variations: In another embodiment, the cabinet size can be adjusted according to the space of the energy storage cabinet, and other detachable connection methods can be used for fixing. The number of fuses and circuit breakers in the low-voltage side circuit can be increased or decreased according to actual needs. However, regardless of the variation, as long as it includes the core scheme of integrated management of DC and AC side circuits and unified control of BMS, it falls within the protection scope of this invention.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage box for an energy storage system including AC access, characterized in that, include: Box; DC-side circuit and AC-side circuit are installed inside the enclosure; And, a battery management system (3) installed inside the box. The DC-side circuit includes a positive electrical circuit and a negative electrical circuit; In the positive electrical circuit, the DC circuit breaker (11), the DC fuse (12), and the DC contactor (13) are connected in sequence between the positive terminal of the battery pack and the external positive terminal. In the negative electrical circuit, the DC circuit breaker (11), the DC fuse (12), and the shunt (16) are connected in sequence between the negative terminal of the battery pack and the external negative terminal. In the AC side circuit, the AC fuse (23), AC contactor (22) and AC circuit breaker (21) are connected in sequence between the AC side output of the PCS and the external three-phase four-wire power supply; The front of the enclosure is provided with a DC circuit breaker switch knob (1) and an AC circuit breaker switch knob (2). The battery management system (3) is connected to the switch status output terminals of the DC contactor (13), the AC contactor (22), the DC circuit breaker (11), and the AC circuit breaker (21), respectively, for monitoring the battery status and controlling the opening and closing of the DC and AC circuits.

2. The high-voltage box of an energy storage system including AC access according to claim 1, characterized in that, The shunt (16) is connected to a measurement line for measuring the main circuit current and feeding it back to the battery management system (3).

3. The high-voltage box of an energy storage system including AC access according to claim 1, characterized in that, In the AC side circuit: One side of the AC fuse (23) is connected to the AC output cable of the PCS, and the other side is connected to the AC contactor (22). One side of the AC contactor (22) is connected to an AC fuse (23), and the other side is connected to an AC circuit breaker (21). The AC circuit breaker (21) is connected to the AC contactor (22) through the wiring terminals and outputs three-phase four-wire power to the outside.

4. The high-voltage box of an energy storage system including AC access according to claim 1, characterized in that, It also includes a low-voltage side circuit, which includes: a 24V power supply (34), a serial port controller (31), a communication management unit (32), a micro meter (331), a low-voltage side fuse (332), a miniature fuse (35), and a miniature circuit breaker (333). The 24V power supply (34) is connected to an external 220V power supply, and its output terminals are respectively connected to the power supply terminals of the battery management system (3), the serial port controller (31) and the communication management unit (32); The micrometer (331) is used to measure the active energy of the energy storage system during charging and discharging; The low-voltage side fuse (332), miniature fuse (35) and miniature circuit breaker (333) are used for short-circuit overcurrent protection and backup protection of the energy storage system.

5. A high-voltage box for an energy storage system including AC access according to claim 1, characterized in that, The DC side circuit is also equipped with a DC relay (14) and an aluminum-cased resistor (15); the aluminum-cased resistor (15) is connected in parallel with the coil of the DC contactor (13).

6. A high-voltage box for an energy storage system including AC access according to claim 1, characterized in that, The battery management system (3) is also connected to sensors for detecting battery pack voltage, current, temperature and SOC, and has a communication interface for data interaction with the EMS system.

7. A high-voltage box for an energy storage system including AC access according to claim 1, characterized in that, The positive and negative terminals of the DC circuit breaker (11) are connected to the positive and negative terminals of the battery pack via positive and negative cables, respectively; a voltage detection line for feeding back the test system voltage information to the battery management system (3) is connected between the DC circuit breaker (11) and the DC fuse (12).

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