Electrical control device and energy storage device

Abstract

The utility model embodiment provides a kind of electrical control device and energy storage equipment, belong to energy storage system field.The electrical control device of energy storage equipment includes: high voltage box;Power distribution device;And energy storage converter, the electrical control device is respectively connected with the high voltage box and the power distribution device, for AC-DC two-way conversion;And electrical box, the high voltage box, power distribution device and energy storage converter are integrated in the electrical box, pre-charging circuit is configured in the energy storage converter, and the pre-charging circuit can simultaneously realize the pre-charging function of high voltage box and energy storage converter.The utility model embodiment integrates high voltage box, power distribution device and energy storage converter in electrical box, significantly reduce the step of assembly process, improve assembly efficiency, integrate electrical parts in smaller size range, which is conducive to cost reduction.

Description

Technical Field

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

[0002] With the continuous catalysis of industrial and commercial energy storage policies, the implementation of time-of-use pricing policies in various parts of the country, and the widening of peak-valley electricity price differences, the investment cost of energy storage has decreased, and the economic viability of industrial and commercial energy storage has gradually become apparent. Recently, the industrial and commercial energy storage industry has experienced rapid development, with an increasing number of industrial and commercial energy storage cabinet projects being implemented. Currently, industrial and commercial energy storage cabinets in the industry generally adopt a standardized integrated cabinet form, integrating battery systems, battery management systems (BMS), high-voltage boxes, energy storage converters (PCS), energy management systems (EMS), liquid cooling, fire protection systems, and power distribution systems. The integration form is relatively uniform, but the current industrial and commercial energy storage market has increasingly higher cost requirements for industrial and commercial energy storage cabinets. At the same time, customers prefer industrial and commercial energy storage cabinets to have a smaller footprint, which requires continuous improvement in the integration level of industrial and commercial energy storage cabinets while continuously reducing costs.

[0003] Therefore, how to improve the integration of industrial and commercial energy storage systems and achieve cost reduction and efficiency improvement while ensuring that the functions, performance and quality of industrial and commercial energy storage cabinets are not affected has become one of the key issues that the industry is increasingly concerned about and focusing on. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an electrical control device and an energy storage device, which can partially or completely solve the technical problems of low integration and high production cost of existing energy storage devices.

[0005] To achieve the above objectives, this utility model provides an electrical control device for an energy storage device. The electrical control device includes: a high-voltage box; a power distribution device; an energy storage converter, the energy storage converter being electrically connected to both the high-voltage box and the power distribution device for bidirectional AC / DC conversion; and an electrical box, in which the high-voltage box, the power distribution device, and the energy storage converter are integrated. The energy storage converter is equipped with a pre-charging circuit. The high-voltage box includes: a first main positive relay, a first main negative relay, and a BMS main control module. The BMS main control module is connected to the pre-charging circuit, and the energy storage converter is connected to both the first main positive relay and the first main negative relay.

[0006] Optionally, the pre-charging circuit includes a second main positive relay, a second main negative relay, and a pre-charging resistor, wherein the second main positive relay and the second main negative relay are respectively connected to the BMS main control module.

[0007] Optionally, the high-voltage box includes: a first DC circuit breaker, the first terminal of which is configured to be connected to the positive terminal of the energy storage device; a fuse, the first terminal of which is connected to the second terminal of the first DC circuit breaker, and the second terminal of which is connected to the first terminal of the first main positive relay; a second DC circuit breaker, the first terminal of which is configured to be connected to the negative terminal of the energy storage device; a shunt, the first terminal of which is connected to the second terminal of the second DC circuit breaker, and the second terminal of which is connected to the first terminal of the first main negative relay; wherein, the second terminal of the first main negative relay is connected to the negative input terminal of the energy storage converter, and the second terminal of the first main positive relay is connected to the positive input terminal of the energy storage converter; the BMS main control module is connected to the shunt, the first main positive relay, and the first main negative relay respectively.

[0008] Optionally, the high-voltage box further includes an AC-to-DC converter, the input terminal of which is connected to an AC input line, and the output terminal of which is connected to the BMS main control module.

[0009] Optionally, the electrical box (2) is also provided with a positive port (31) and a negative port (32). The first end of the first DC circuit breaker (33) is connected to the positive end of the energy storage device through the positive port (31), and the first end of the second DC circuit breaker (34) is connected to the negative end of the energy storage device through the negative port (32).

[0010] Optionally, the power distribution device includes: a protection module connected to an AC input line; a current transformer connected to the protection module at its input terminal; and multiple power distribution switches connected in series between the output terminal of the current transformer and the energy storage converter.

[0011] Optionally, the protection module includes: a plurality of AC circuit breakers connected in series between the AC input line and the current transformer; and a plurality of surge protectors connected in series between the plurality of AC circuit breakers and the current transformer.

[0012] On the other hand, this utility model also provides an energy storage device, including the aforementioned electrical control device.

[0013] Optionally, the energy storage device includes a housing, a liquid cooling unit, a battery system, and a battery management system, wherein the electrical box is installed inside the housing; the liquid cooling unit is installed above the electrical box for heat dissipation of the electrical control device; the battery system is installed below the electrical box and electrically connected to the electrical control device; and the battery management system is installed below the battery system and electrically connected to both the electrical control device and the battery system; the liquid cooling unit, battery system, and battery management system are all installed inside the housing.

[0014] In this embodiment of the invention, the original pre-charging circuit in the high-voltage box is eliminated, and only the original pre-charging circuit in the energy storage converter is retained. The BMS main control module in the high-voltage box is connected to the pre-charging circuit in the energy storage converter. After receiving a high-voltage command, the BMS main control module determines whether the pre-charging circuit is in an open state. When the pre-charging circuit is open, the BMS main control module controls the first main positive relay and the first main negative relay in the high-voltage box to close. The energy storage converter is connected to both the first main positive relay and the first main negative relay, and is used to pre-charge the high-voltage box and the energy storage converter when both are determined to be closed. Based on the above connection relationship, this invention simultaneously realizes the pre-charging function of the high-voltage box and the energy storage converter. Therefore, this embodiment of the invention reduces the number of electrical components and integrates the high-voltage box, power distribution device, and energy storage converter into the same electrical box, reducing the amount of related copper busbars and wiring harnesses, thus improving the assembly efficiency of the electrical control device and reducing production costs.

[0015] Other features and advantages of this utility model embodiment will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the electrical control device structure provided in the first embodiment of this utility model;

[0018] Figure 2 This is an electrical schematic diagram of the electrical control device provided in the first embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the energy storage converter provided in this embodiment of the utility model;

[0020] Figure 4This is a schematic diagram of the high-voltage box and power distribution device provided in an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of an energy storage device structure provided in the second embodiment of this utility model;

[0022] Figure 6 This is a schematic diagram of the internal structure of the energy storage device provided in the second embodiment;

[0023] Figure 7 This is a control flowchart of the high voltage on the energy storage device provided in the second embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures

[0025] 1. Energy storage converter 2. Electrical box

[0026] 3-shell 4-liquid-cooled unit

[0027] 5. Battery System 6. Battery Management System

[0028] 11 High-voltage box 12 Power distribution unit

[0029] 22 First main positive relay 23 First main negative relay

[0030] 24 AC to DC converter 25 Protection module

[0031] 26 Distribution switch 27 BMS main control module

[0032] 28 Current transformer 31 positive port

[0033] 32 Negative Port 33 First DC Circuit Breaker

[0034] 34 Second DC circuit breaker 35 Fuse

[0035] 36 Shunt 37 Surge Protector

[0036] 38 Second main positive relay 39 Second main negative relay

[0037] 40 pre-charge resistor Detailed Implementation

[0038] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0039] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with the relevant provisions of national laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0040] Figure 1 and Figure 2 This is a schematic diagram of the structure and electrical schematic diagram of an electrical control device provided in the first embodiment of this utility model. The electrical control device includes: a high-voltage box 11; a power distribution device 12; and an energy storage converter 1 (i.e., PCS). The energy storage converter 1 is electrically connected to both the high-voltage box 11 and the power distribution device 12 for bidirectional AC / DC conversion. The energy storage converter 1 is equipped with a pre-charging circuit. The high-voltage box 11 includes: a first main positive relay 22, a first main negative relay 23, and a BMS main control module 27. The BMS main control module 27 is connected to the pre-charging circuit and, upon receiving a high-voltage command, determines whether the pre-charging circuit is in an open state. When the pre-charging circuit is in an open state, the BMS main control module 27 controls the first main positive relay 22 and the first main negative relay 23 in the high-voltage box to close. The energy storage converter 1 is also connected to the first main positive relay 22 and the first main negative relay 23 and, when it is determined that both the first main positive relay 22 and the first main negative relay 23 are closed, pre-charges the high-voltage box 11 and the energy storage converter 1.

[0041] The aforementioned electrical control device can be specifically applied to energy storage equipment. In some embodiments, the energy storage equipment can specifically be an energy storage cabinet. For ease of description, the following will use an energy storage cabinet as an example.

[0042] It should be noted that the electrical control device provided in this embodiment of the present invention refers to an integrated component that integrates the high-voltage box 11, the power distribution device 12, and the energy storage converter 1 into the same electrical box (i.e., electrical box 2), and is an important component of commercial energy storage cabinets. This electrical energy storage equipment includes the high-voltage box 11 (see details for reference). Figure 3 and Figure 4 A high-voltage box is used to connect energy storage batteries to an external power system, enabling the input and output of electrical energy. It can receive electrical energy from the power grid or renewable energy generation systems and store it in energy storage batteries; simultaneously, it can also transmit the energy from the storage batteries back to the grid or supply it to loads. The high-voltage box can also distribute electrical energy, allocating high-voltage power to different electrical equipment and systems to ensure the normal operation of each component.

[0043] Figure 2This is an electrical schematic diagram of the electrical control device provided in this embodiment of the utility model. The power distribution device 12 is used for the AC side power distribution system and protection circuit. When AC power (e.g., mains power) is connected to the power distribution device 12, the AC power distribution function is realized. The energy storage converter 1 (i.e., PCS) is electrically connected to the high-voltage box 11 and the power distribution device 12 respectively, and is used for AC-DC bidirectional conversion.

[0044] It should be noted that the energy storage converter 1 is a device capable of controlling the battery charging and discharging process and realizing the conversion between DC and AC power. It can not only directly supply power to AC loads in the absence of a power grid, but also bridge the gap between the power grid and the energy storage system, enabling bidirectional energy flow. The energy storage converter 1 mainly consists of a DC / AC bidirectional converter, a control unit, a protection circuit, a communication interface (not shown in the above diagram), and a pre-charging circuit (see reference for details). Figure 3 It consists of components such as the DC / AC bidirectional converter, which is the core component for energy conversion; and the control unit, which is the "brain" of the entire system, realizing precise control of the power conversion process. The control unit receives control commands from the background through the communication interface, and controls the DC / AC bidirectional converter to charge or discharge the battery according to the sign and magnitude of the power command, thereby realizing the regulation of the active and reactive power of the power grid. It mainly realizes the AC-DC conversion work. The above "three-in-one" electrical control device can realize all the functions of the high-voltage box, power distribution system and PCS in the original energy storage cabinet.

[0045] This embodiment of the invention eliminates the original pre-charging circuit in the high-voltage box 11, retaining it only in the energy storage converter 1. The high-voltage box 11 includes: a first main positive relay 22, a first main negative relay 23, and a BMS main control module 27. The BMS main control module 27 is connected to the pre-charging circuit, and the energy storage converter 1 is connected to both the first main positive relay 22 and the first main negative relay 23. First, after receiving the high-voltage command, the BMS main control module 27 determines whether the pre-charging circuit of the energy storage converter 1 is in an open state (i.e., whether the second main positive relay 38 and the second main negative relay 39 are in an open state). If it is in a closed state (i.e., not open), the BMS reports an alarm and prohibits high-voltage access. If it is in an open state, the BMS closes the first main positive relay 22 and the first main negative relay 23 in the high-voltage box 11.

[0046] Then, if the energy storage converter 1 detects that the first main positive relay 22 and the first main negative relay 23 in the high-voltage box 11 are always in the open state, the energy storage converter 1 will report an alarm and prohibit the energy storage converter 1 from applying high voltage. Conversely, if the energy storage converter 1 detects that the first main positive relay 22 and the first main negative relay 23 in the high-voltage box are closed (using both I / O and communication for simultaneous monitoring), the energy storage converter 1 will execute a pre-charging strategy under the conditions of permissible operation and high voltage, thereby achieving simultaneous pre-charging of the high-voltage box 11 and the energy storage converter 1 (please refer to the subsequent section on the operating principle of the energy storage cabinet for details, such as...). Figure 7 (As shown).

[0047] In addition, before pre-charging, all components within the commercial and industrial energy storage cabinet must send a ready signal (dry contact and communication method) to the EMS (Energy Management System, a technical system used to monitor, control, and optimize the operation of energy storage cabinets) after low-voltage power-on. This includes the "three-in-one" electrical control device, indicating that all components are fault-free and ready for high-voltage operation. For example, if the second main (positive / negative) relay of energy storage converter 1 becomes stuck or experiences other faults, the ready signal will change, and high-voltage operation will no longer be permitted.

[0048] Finally, the energy storage converter 1 autonomously determines whether the pre-charging was successful. If the voltage difference across the second main positive (negative) relay in the energy storage converter 1 is within 5V, the pre-charging is considered successful, and the second main positive relay and the second main negative relay can be closed to complete the high-voltage connection process. If the energy storage converter 1 determines that the pre-charging failed, the energy storage converter 1 will report an alarm and prohibit the connection to high voltage.

[0049] This utility model embodiment controls the pre-charging circuit (not shown in the figure) of the energy storage converter 1 and the opening and closing states of the first main positive relay 22 and the first main negative relay 23 in the high voltage box 11 through the above-mentioned preset program, thereby realizing the pre-charging function of the high voltage box 11 and the energy storage converter 1.

[0050] Furthermore, the pre-charging circuit includes a second main positive relay 38, a second main negative relay 39, and a pre-charging resistor 40. The second main positive relay 38 and the second main negative relay 39 are respectively connected to the BMS main control module 27.

[0051] Figure 3This is the first embodiment of the pre-charging circuit provided by this utility model. The pre-charging circuit includes a second main positive relay 38, a second main negative relay 39, and a pre-charging resistor 40, with the pre-charging resistor 40 connected in series with the second main negative relay 39. The first main positive relay 22 is connected to the second main positive relay 38, and the first main negative relay 23 is connected to the second main negative relay 39. The function of the pre-charging circuit is to limit inrush current. Its core principle is to use the pre-charging resistor 40 connected in series in the charging circuit in the initial stage to forcibly limit the charging current, allowing the capacitor voltage to rise gradually. When the capacitor voltage approaches the power supply voltage, the pre-charging resistor is short-circuited by closing the second main positive relay, and the system enters normal operation.

[0052] For example, the second main positive relay 38 and the second main negative relay 39 are also connected to the BMS main control module 27. Specifically, after receiving the high-voltage command, the electrical control device first determines whether the second main positive relay 38 and the second main negative relay 39 of the energy storage converter 1 are in a closed state. If they are in a closed state, the BMS main control module 27 reports an alarm, and the BMS prohibits the application of high voltage. The subsequent judgment steps are the same as the implementation process of the pre-charging circuit described above, and will not be repeated here.

[0053] Furthermore, in this embodiment of the invention, the high-voltage box 11, the power distribution device 12, and the energy storage converter 1 are integrated into the electrical box 2 (e.g., Figure 1 In this process, by optimizing the electrical layout, various electrical components are integrated into a smaller size range, which can reduce the amount of copper busbars and wire harnesses used, facilitate assembly, and reduce production costs.

[0054] Further, the high-voltage box 11 includes: a first DC circuit breaker 33, the first end of which is connected to the positive terminal of the energy storage device; a fuse 35, the first end of which is connected to the second end of the first DC circuit breaker 33; the second end of which is connected to the first end of the first main positive relay 22; a second DC circuit breaker 34, the first end of which is connected to the negative terminal of the energy storage device; a shunt 36, the first end of which is connected to the second end of the second DC circuit breaker 34, and the second end of which is connected to the first end of the first main negative relay 23; wherein, the second end of the first main negative relay 23 is connected to the negative input terminal of the energy storage converter 1, and the second end of the first main positive relay 22 is connected to the positive input terminal of the energy storage converter 1; and the BMS main control module 27 is connected to the shunt 36, the first main positive relay 22, and the first main negative relay 23 respectively.

[0055] For example, Figure 2This is an electrical schematic diagram of the electrical control device provided in this embodiment of the utility model. It comprises three parts: a high-voltage box 11, an energy storage converter 1, and a power distribution device 12. The high-voltage box 11 does not include a pre-charging circuit; only the energy storage converter 1 retains the pre-charging circuit. By integrating the three components, the pre-charging function of the high-voltage box 11 and the energy storage converter 1 can be achieved through a single pre-charging circuit. This also reduces the amount of copper busbars and wiring harnesses used, lowering production costs.

[0056] The electrical connections of the high-voltage box 11 are as follows: the first terminal of the first DC circuit breaker 33 is connected to the positive terminal (e.g., the positive pole of the battery) of the energy storage device (e.g., the energy storage battery); the second terminal of the first DC circuit breaker 33 is connected to the first terminal of the fuse 35; the first terminal of the first main positive relay 22 is connected to the second terminal of the fuse 35; and the second terminal of the first main positive relay 22 is connected to the input positive terminal of the energy storage converter 1.

[0057] The high-voltage box 11 also includes a second DC circuit breaker 34. The first terminal of the second DC circuit breaker 34 is connected to the negative terminal of the energy storage device (e.g., the negative terminal of the energy storage battery), and the second terminal of the second DC circuit breaker 34 is connected to the first terminal of the shunt 36. The second terminal of the shunt 36 is connected to the first terminal of the first main negative relay 23, and the second terminal of the first main negative relay 23 is connected to the input negative terminal of the energy storage converter 1. The BMS main control module 27 is connected to the shunt 36, the first main positive relay 22, and the first main negative relay 23, respectively. The shunt 36 in the high-voltage box 11 can specifically be a current shunt. Its basic principle is Ohm's law. By setting resistors, the current is shunted to different output terminals. Since the resistance value of each output terminal is the same, the shunt current is also uniform, which is used to evenly distribute the input flow or signal to multiple output channels.

[0058] Among them, the first main positive relay 22 and the first main negative relay 23 (K1 represents the first main positive relay and K2 represents the first main negative relay in the figure) are used to close the first main positive (negative) relay 22 (23) when the BMS main control module 27 issues a turn-on command, allowing the current to flow from the positive (negative) terminal of the battery through the energy storage converter 1; when it is necessary to disconnect the power supply, the first main positive (negative) relay 22 (23) opens to cut off the current path. This control method ensures the safe operation and efficient management of the battery system.

[0059] Fuse 35: When current flows through a conductor, it generates heat. When the current exceeds a specified value, the conductor reaches its melting point and melts, thus breaking the circuit. Fuses are mainly used for short-circuit and overload protection. The first DC circuit breaker 33 and the second DC circuit breaker 34 (a circuit breaker is an automatic switch that functions as a manual switch and also provides undervoltage, overload, and short-circuit protection) can automatically disconnect the circuit when a fault is detected, protecting electrical appliances and wiring.

[0060] The BMS main control module 27 is primarily used for the detection and protection of energy storage devices. It is an indispensable core component of energy storage equipment, ensuring safe, reliable, and efficient battery operation through comprehensive monitoring, management, and protection of the battery pack, while extending battery life. Its functions cover multiple aspects such as battery status monitoring, protection, balancing, communication, control, and fault diagnosis, making it a key guarantee for the intelligence and safety of energy storage systems.

[0061] Furthermore, the electrical box 2 is also provided with a positive port 31 and a negative port 32. The first end of the first DC circuit breaker 33 is connected to the positive end of the energy storage device through the positive port 31, and the first end of the second DC circuit breaker 34 is connected to the negative end of the energy storage device through the negative port 32.

[0062] As a crucial component of the energy storage cabinet, the electrical control device needs to collaborate with other components. Therefore, a reserved interface (the specific location can be designed according to actual needs) is provided on electrical box 2 for connecting AC input lines and for external communication. The "three-in-one" electrical control device is integrated into one electrical box 2, which integrates AC / DC circuits, various high-voltage copper busbars, and wiring harnesses. Only AC / DC high-voltage wiring ports and communication interfaces are reserved externally on the "three-in-one" electrical control device. This significantly reduces the number of steps in the assembly process of industrial and commercial energy storage cabinets, improves assembly efficiency, and reduces the probability of errors.

[0063] Furthermore, such as Figure 4 As shown, the high-voltage box 11 also includes an AC-to-DC converter 24, the input terminal of which is connected to an AC input line, and the output terminal of which is connected to the BMS main control module 27.

[0064] For example, the high-voltage box 11 also includes an AC-to-DC converter 24, whose input terminal is connected to an AC input line (live wire L1 and neutral wire N), and whose output terminal is connected to the BMS main control module 27. It can also be connected to other control modules to serve as a power supply for the BMS main control module 27 and other control modules during normal operation.

[0065] Furthermore, the power distribution device 12 includes: a protection module 25, which is connected to the AC input line; a current transformer 28, whose input terminal is connected to the protection module; and a plurality of power distribution switches 26, which are connected in series between the output terminal of the current transformer 28 and the energy storage converter 1.

[0066] Furthermore, the protection module 25 includes: multiple AC circuit breakers, which are connected in series between the AC input line and the current transformer 28; and multiple surge protectors 37, which are connected in series between the multiple AC circuit breakers and the current transformer 28.

[0067] For example, the power distribution unit 12 includes a protection module 25 (such as...). Figure 4 The protection module 25 is connected to the AC input line. For example... Figure 2 As shown, the protection module includes multiple AC circuit breakers (CB1, CB2, CB3, and CB4, each representing a different circuit breaker, typically used to identify different parts or functional areas in a circuit diagram. For example, CB1 may represent the main circuit breaker, CB2 may represent the backup power circuit breaker, and CB3 and CB4 may represent circuit breakers for other specific circuits or devices). These multiple AC circuit breakers are connected in series between the AC input line (e.g., mains power) and the current transformer 28. A surge protector 37 is also connected in series between the AC circuit breakers and the input terminals of the current transformer 28 to prevent surges from damaging other devices in the circuit.

[0068] A surge protector (SPD) is an electronic device that provides safety protection for various electronic devices, instruments, and communication lines. Its main function is to conduct and divert current in a very short time when a sudden spike current or voltage is generated in an electrical circuit or communication line, thereby preventing the surge from damaging other equipment in the circuit.

[0069] Multiple distribution switches 26 are connected in series between the output terminal of the current transformer 28 and the energy storage converter 1. Distribution switches 26 refer to devices used to control the distribution and transmission of electrical energy in a power system. They are mainly used to open or close circuits so as to transmit power to specific electrical appliances, equipment or areas. Distribution switches 26 are one or more of circuit breakers, disconnect switches or contactors.

[0070] AC circuit breakers are used to disconnect current in the event of a power outage, protecting circuits and equipment from damage caused by overloads or short circuits. Disconnect switches are used to isolate a circuit from the power source, ensuring safe operation during maintenance or emergencies.

[0071] Furthermore, the energy storage converter 1 is located in the upper part of the electrical box 2, while the high-voltage box 11 and the power distribution device 12 are both located in the lower part of the electrical box 2. This arrangement makes full use of the space and makes the three-in-one integrated component more compact.

[0072] Figure 4This is a schematic diagram of the high-voltage box and power distribution device provided in this embodiment of the utility model. The first main positive relay 22 is installed in the electrical box 2 near the first DC circuit breaker 33 and the second DC circuit breaker 34. The first main negative relay 23 is installed near the first main positive relay 22. The AC-to-DC converter 24 is installed near the first main negative relay 23. The installation positions of the protection module 25, distribution switch 26, BMS main control module 27, and current transformer 28 can be referenced. Figure 4 The position in the middle. Figure 4 The installation positions of each component can be adjusted according to actual needs, and any structural diagrams that have undergone simple positional changes are within the protection scope of this utility model embodiment. The above-described component arrangement of this utility model embodiment saves space in the electrical control device, shortens wiring length, and facilitates production and assembly.

[0073] refer to Figure 4 The specific implementation principle of this utility model embodiment is as follows: When alternating current (mains power, L1, L2, L3 usually represent the three phase lines of a three-phase power supply. Three-phase power supply is a common power supply method in power systems, which consists of three sinusoidal voltages with a phase difference of 120 degrees. These three phase lines are represented by L1, L2, and L3 respectively, and they play the role of transmitting electrical energy in the power system. N usually represents the neutral line or zero line. The neutral line is an important component of a three-phase power supply, which is connected to the three phase lines to form a closed loop. In a three-phase four-wire power supply system, the neutral line is usually used as a neutral line to connect the load and the power supply to ensure the normal operation of the circuit) is connected to the "three-in-one" electrical control device, it first passes through multiple AC circuit breakers in the distribution device 12, and then through the current transformer 28 ( Figure 2 After that, it enters the power distribution device and is connected to the protection module 25 to realize the AC power distribution function; at the same time, the DC power from the battery side enters the "three-in-one" electrical control device and passes through the first DC circuit breaker 33, the second DC circuit breaker 34, and then through the first main positive relay 22 and the first main negative relay 23. The BMS main control module 27 is responsible for controlling the first main positive relay 22 and the first main negative relay 23 to realize the on and off function of the DC side circuit. Meanwhile, the AC to DC converter 24 can convert the AC side power supply into DC low voltage power supply to power the BMS main control module 27 and the EMS and other control devices in the energy storage cabinet.

[0074] The "three-in-one" electrical control device provided by this utility model adopts a "three-in-one" electrical architecture design of PCS, high-voltage box, and power distribution device. It redesigns the electrical principles of PCS, high-voltage box, and power distribution system in industrial and commercial energy storage cabinets, reduces redundant circuits, optimizes wiring harness and copper busbar design, and integrates PCS, high-voltage box, and power distribution device at the electrical level. It can realize AC / DC bidirectional conversion, DC side control function, BMS main control function, AC power distribution system function, and AC / DC circuit protection function.

[0075] Through detailed analysis of electrical principles, it was found that the pre-charging system (PCS) in commercial and industrial energy storage cabinets includes a pre-charging system, and another pre-charging system exists in the high-voltage box. During the high-voltage process of the battery system, both pre-charging systems are performing pre-charging operations, resulting in functional redundancy and unnecessary costs associated with the corresponding pre-charging circuits. The "three-in-one" electrical control device provided by this invention eliminates the original pre-charging circuit in the high-voltage box, retaining only the pre-charging circuit in the PCS, thus reducing the number of electrical components. During the high-voltage process of the battery system, only one pre-charging circuit operates in the DC circuit, achieving high efficiency and safety in the high-voltage system. Furthermore, through optimized electrical layout, various electrical components are integrated into a smaller size, reducing the amount of copper busbars and wiring harnesses used, further lowering costs.

[0076] This utility model embodiment also provides an energy storage device, including the above-described electrical control device.

[0077] Figure 5 This is a schematic diagram of an energy storage device structure provided in the second embodiment of this utility model. The energy storage device includes: the electrical control device provided in the above embodiment; a housing 3, a liquid cooling unit 4, a battery system 5, and a battery management system 6 (i.e., BMS), wherein the electrical box 2 is installed inside the housing 3; the liquid cooling unit 4 is installed above the electrical box 2 for heat dissipation of the electrical control device; the battery system 5 is installed below the electrical box 2 and electrically connected to the electrical control device; and the battery management system 6 is installed below the battery system 5 and electrically connected to both the electrical control device and the battery system 5; the liquid cooling unit 4, the battery system 5, and the battery management system 6 are all installed inside the housing 3.

[0078] For example, such as Figure 6This is a schematic diagram of the internal structure of the energy storage cabinet provided in the second embodiment. It includes: a housing 3; an electrical box 2 for the electrical control device installed inside the housing 3, whose working principle and effect are the same as in the first embodiment, and will not be described again here; a liquid cooling unit 4 installed above the electrical box 2 to dissipate heat from the components inside the electrical control device, preventing overheating of the circuits when there is a large load and high current; a battery system 5 installed below the electrical box 2 and electrically connected to the electrical control device; the positive port of the electrical control device is used to connect to the positive terminal of the battery in the battery system, or to the DC high-voltage output terminal; the negative port is used to connect to the negative terminal of the battery in the battery system, or to the DC low-voltage output terminal of the device (here, "low voltage" refers to the DC high-voltage output, not absolute low voltage); it is usually connected to the negative terminal of the battery or the negative terminal of the DC power supply to complete the circuit loop. It also includes a battery management system 6 installed below the battery system 5 and electrically connected to the electrical control device and the battery system; its working principle is the same as in the prior art, and will not be described again here.

[0079] like Figure 7 This is a control flowchart for the high voltage on the energy storage cabinet provided in the second embodiment of this utility model. The specific control method is the same as in the first embodiment, and will not be described again here.

[0080] Furthermore, the shell can be made of any one of steel plate, aluminum alloy, or fiberglass. This embodiment of the invention does not impose specific limitations on the material of the shell.

[0081] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0082] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0083] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0084] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0085] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0086] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0087] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0088] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0089] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An electrical control device, characterized in that, include: High-voltage box (11); Power distribution equipment (12); Energy storage converter (1), which is electrically connected to the high voltage box (11) and the power distribution device (12) respectively, for bidirectional AC-DC conversion; The high-voltage box (11), the power distribution device (12) and the energy storage converter (1) are integrated in the electrical box (2); The energy storage converter (1) is equipped with a pre-charging circuit, and the high-voltage box (11) includes: a first main positive relay (22), a first main negative relay (23) and a BMS main control module (27); the BMS main control module (27) is connected to the pre-charging circuit, and the energy storage converter (1) is connected to the first main positive relay (22) and the first main negative relay (23) respectively.

2. The electrical control device according to claim 1, characterized in that, The pre-charging circuit includes a second main positive relay (38), a second main negative relay (39), and a pre-charging resistor (40). The second main positive relay (38) and the second main negative relay (39) are respectively connected to the BMS main control module (27).

3. The electrical control device according to claim 1, characterized in that, The high-voltage box (11) includes: a first DC circuit breaker (33), the first end of which is configured to be connected to the positive end of the energy storage device; A fuse (35) is provided, the first end of which is connected to the second end of a first DC circuit breaker (33), and the second end of which is connected to the first end of a first main positive relay (22). The first terminal of the second DC circuit breaker (34) is configured to be connected to the negative terminal of the energy storage device; Shunt (36), the first end of the shunt (36) is connected to the second end of the second DC circuit breaker (34), and the second end of the shunt (36) is connected to the first end of the first main negative relay (23); The second end of the first main negative relay (23) is connected to the negative input terminal of the energy storage converter (1), and the second end of the first main positive relay (22) is connected to the positive input terminal of the energy storage converter (1); the BMS main control module (27) is connected to the shunt (36), the first main positive relay (22) and the first main negative relay (23) respectively.

4. The electrical control device according to claim 3, characterized in that, The high-voltage box (11) also includes an AC to DC converter (24). The input terminal of the AC-to-DC converter (24) is connected to the AC input line, and the output terminal of the AC-to-DC converter is connected to the BMS main control module (27).

5. The electrical control device according to claim 3, characterized in that, The electrical box (2) is also provided with a positive port (31) and a negative port (32). The first end of the first DC circuit breaker (33) is connected to the positive end of the energy storage device through the positive port (31), and the first end of the second DC circuit breaker (34) is connected to the negative end of the energy storage device through the negative port (32).

6. The electrical control device according to claim 1, characterized in that, The power distribution device (12) includes: a protection module (25), which is connected to the AC input line; A current transformer (28) is connected to the protection module at its input terminal. In addition, a plurality of power distribution switches (26) are connected in series between the output terminal of the current transformer (28) and the energy storage converter (1).

7. The electrical control device according to claim 6, characterized in that, The protection module (25) includes: multiple AC circuit breakers, which are connected in series between the AC input line and the current transformer (28); And multiple surge protectors (37), which are connected in series between the multiple AC circuit breakers and the current transformer (28).

8. The electrical control device according to claim 1, characterized in that, The energy storage converter (1) is located in the upper part of the electrical box (2), and the high voltage box (11) and the power distribution device (12) are both located in the lower part of the electrical box (2).

9. An energy storage device, characterized in that, include: The electrical control device according to any one of claims 1-8.

10. The energy storage device according to claim 9, characterized in that, The energy storage device includes a housing (3), a liquid cooling unit (4), a battery system (5), and a battery management system (6). The electrical box (2) is installed inside the housing (3); A liquid cooling unit (4) is installed above the electrical box (2) to dissipate heat for the electrical control device; The battery system (5) is installed below the electrical box (2) and electrically connected to the electrical control device; And a battery management system (6), installed below the battery system (5) and electrically connected to the electrical control device and the battery system (5); The liquid cooling unit (4), battery system (5) and battery management system (6) are all installed inside the housing (3).

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