Parallel operation control system of energy storage power supply

Abstract

The utility model discloses a parallel operation control system of an energy storage power supply, the system comprises an energy storage power supply, and a battery, an inverter, a switch piece, an AC output interface, a parallel operation interface and a controller which are arranged in the energy storage power supply, the input end of the inverter is electrically connected with the battery, and the output end of the inverter is electrically connected with the switch piece and the AC output interface; the switch piece is electrically connected with the parallel operation interface, the switch piece is in communication connection with the controller, and the switch-on or switch-off of the switch piece is controlled by the controller; when the parallel operation interfaces of the two energy storage power supplies are connected together, the corresponding conductors on the two parallel operation interfaces are contacted and conducted, and the two short-circuited conductors on one parallel operation interface are communicated with the two conductors connected with the controller. After receiving the connection signal, the controller controls the switching element to execute the action of connecting a line between the output end of the inverter and the parallel operation interface; according to the utility model, an additional parallel operation device is not needed, the parallel operation is very convenient, and the doubled output of power or voltage can be quickly realized.

Description

Technical Field

[0001] This utility model relates to the field of mobile energy storage power technology, specifically to a parallel control system for energy storage power. Background Technology

[0002] Energy storage power supplies are used for storing and converting electrical energy, serving as power sources for various electrical appliances. They mainly consist of batteries, inverters, and AC output interfaces. The batteries power the inverter, which converts the battery's DC power into AC power for output. Some existing energy storage power supplies have parallel operation capabilities, allowing two identical power supplies to output double power by connecting their AC output ports in parallel. The two parallel power supplies should have the same voltage and frequency, achieving power or voltage superposition by having one device track and synchronize the sinusoidal wave phase of the other. Current technologies require external parallel operation devices to achieve this. These devices connect their two inputs to the parallel ports of the two devices, pooling their power. This approach requires specialized parallel operation devices, making parallel operation cumbersome, resulting in low utilization rates, poor user experience, and high device costs, thus reducing market competitiveness. Utility Model Content

[0003] The purpose of this utility model is to provide a parallel control system for energy storage power sources, aiming to improve the existing technology that requires the addition of an external parallel device to achieve parallel operation of two energy storage power sources, resulting in complicated operation, poor user experience, and high parallel operation costs.

[0004] This utility model is implemented as follows:

[0005] A parallel control system for an energy storage power supply, the system comprising an energy storage power supply, and a battery, inverter, switching components, AC output interface, parallel interface, and controller disposed within the energy storage power supply, wherein:

[0006] The input terminal of the inverter is electrically connected to the battery, and the output terminal of the inverter is electrically connected to the switch and the AC output interface; the switch is electrically connected to the parallel interface and is communicatively connected to the controller, and the switching on or off is controlled by the controller.

[0007] The parallel interface is provided with multiple conductors that are insulated from each other. At least one conductor is connected to the inverter output terminal through a switch. At least two conductors are shorted together. At least two conductors are connected to the signal input terminal of the controller. When the parallel interfaces of two energy storage power supplies are connected together, the corresponding conductors on the two parallel interfaces make contact and conduct. The two shorted conductors on one of the parallel interfaces connect to the two conductors connected to the controller. After receiving the connection signal, the controller controls the switch to perform the action of connecting the line between the inverter output terminal and the parallel interface.

[0008] When the switch is turned on, the parallel interface lines of the two energy storage power supplies are connected to each other, so that the inverter output terminals of the two energy storage power supplies are connected together. The power of the two inverters is superimposed and output to the outside through the connection of the parallel interface, and the power of the two inverters can be output to the outside through the AC output interface of either of the two energy storage power supplies.

[0009] Furthermore, the switching element includes a relay, whose contacts control the connection or disconnection of the line between the inverter output and the parallel interface.

[0010] Furthermore, the relay includes a relay coil, the power supply for the relay coil is provided by the controller, the relay contacts are closed when the controller supplies power to the coil, and the relay contacts are open when the controller does not supply power to the coil, the power supply for the controller is provided by a battery.

[0011] Furthermore, the relay is provided with multiple contacts, each of which is connected to a corresponding conductor on the parallel interface. The on / off control signal of the relay is generated when other conductors on the parallel interface of the two energy storage power supplies come into contact or separate. The controller controls the relay contacts to open or close according to the on / off control signal.

[0012] Furthermore, the conductor of the parallel interface includes paired metal pins and sockets. In the two parallel energy storage power supplies, the conductor of the parallel interface of one of them is a pin, and the conductor of the parallel interface of the other is a socket. The pin is inserted into the socket to achieve conductor contact and conduction.

[0013] Furthermore, the diameter of the pins or sockets connected to the output terminal of the inverter is larger than the diameter of the pins or sockets connected to the controller.

[0014] Furthermore, the inverter is a single-phase inverter, and there is at least one pin or socket connected to the output terminal of the inverter, and the pin or socket is connected to the live wire L of the single-phase output terminal of the inverter.

[0015] Furthermore, the inverter is a three-phase inverter, with at least three pins or sockets connected to the inverter output terminal, and these three pins or sockets are respectively connected to the three live wires L1 / L2 / L3 of the three-phase output terminal of the inverter.

[0016] Furthermore, the energy storage power supply is equipped with two parallel interfaces. Each parallel interface is connected to the output terminal of the inverter through a corresponding switch. One parallel interface integrates metal pins of various diameters to form a parallel plug, and the other parallel interface integrates metal sockets of various diameters to form a parallel socket. The parallel plug is located on the top of the energy storage power supply, and the parallel socket is located on the bottom of the energy storage power supply. When two energy storage power supplies are stacked on top of each other, the parallel plug of the lower energy storage power supply is plugged into the parallel socket of the upper energy storage power supply to achieve the connection and conduction of the parallel interfaces of the two energy storage power supplies.

[0017] Furthermore, the inverter has a parallel communication interface, which is connected to the corresponding conductors on the parallel plug and the parallel socket. The controller has a parallel control switch, which is electrically connected to the parallel communication interface.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model does not require an additional paralleling device, and the paralleling operation is very convenient, which can quickly achieve a doubling of power or voltage output.

[0020] 2. The control system designed for the parallel interface of the energy storage power supply in this utility model can ensure that the exposed live and neutral wires of the parallel interface will not be energized when not in parallel operation, thus fundamentally eliminating the risk of electric shock and safety hazards, and avoiding accidental short circuit damage to the energy storage power supply. It has obvious advantages of convenient operation, safety and reliability and low cost, and is very suitable for application in various energy storage power supply products, with obvious technical advantages. Attached Figure Description

[0021] Figure 1 This is a block diagram of the electrical control structure of the parallel control system provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a block diagram of the electrical control structure of the parallel control system for two energy storage power supplies stacked vertically, as provided in Embodiment 1 of this utility model.

[0023] Figure 3 This is a block diagram of the electrical control structure of the parallel control system provided in Embodiment 2 of this utility model;

[0024] Figure 4 This is a block diagram of the electrical control structure of the parallel control system for two energy storage power supplies stacked vertically, provided in Embodiment 2 of this utility model.

[0025] Figure 5 This is a block diagram of the electrical control structure of the parallel control system provided in Embodiment 3 of this utility model. Detailed Implementation

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0028] Example 1

[0029] like Figure 1 As shown, a parallel control system for an energy storage power source includes an energy storage power source, a battery, an inverter, switching components, an AC output interface, a parallel interface, and a controller. The inverter is a single-phase inverter, and the switching components are relays used to control the connection or disconnection of the line between the inverter output terminal and the parallel interface. One energy storage power source includes two relays, relay A and relay B. The inverter's input terminal is electrically connected to the battery, converting the DC power input from the battery into AC power output. The inverter's output terminal is electrically connected to the AC output interface, through which the inverter outputs AC power. The AC output interface typically has various types of standard AC sockets, such as 10A, 16A, or 32A sockets, depending on the rated current. External appliances can obtain power from the energy storage power source by connecting their plugs to these standard sockets.

[0030] like Figure 1As shown, the energy storage power supply has two parallel interfaces, one upper and one lower. The upper interface integrates metal pins of various diameters to form a parallel plug, while the lower interface integrates metal sockets of various diameters to form a parallel socket. The parallel plug is connected to the inverter's output terminal via relay A, and the parallel socket is connected to the inverter's output terminal via relay B. Each relay includes a relay coil, which is powered by the controller. When the controller powers the coil, the relay contacts are closed; when the controller does not power the coil, the relay contacts are open. The controller is powered by a battery. The relay has multiple contacts, each connected to a corresponding conductor on the parallel interface. The on / off control signal for the relay is generated when other conductors on the parallel interfaces of the two energy storage power supplies come into contact or separate. The controller controls the relay contacts to open or close based on the on / off control signal. The parallel connection plug is located on top of the energy storage power supply, and the parallel connection socket is located at the bottom. When two energy storage power supplies are stacked, the parallel connection plug of the lower energy storage power supply is plugged into the parallel connection socket of the upper energy storage power supply to establish a connection between the parallel interfaces of the two energy storage power supplies. Figure 2 As shown. In Figure 2 In the diagram, the upper energy storage power source is energy storage power source 2, and the lower energy storage power source is energy storage power source 1.

[0031] In this embodiment, the parallel connection plug at the upper end of the energy storage power supply includes four mutually insulated conductors: pins A1, A2, A3, and A4. Pins A3 and A4 are shorted together, and pins A1 and A2 are communicatively connected to the controller. The parallel connection socket at the lower end of the energy storage power supply includes four mutually insulated conductors: metal sockets B1, B2, B3, and B4. Metal sockets B1 and B2 are shorted together, and metal sockets B3 and B4 are communicatively connected to the controller. The controller includes an MCU chip with built-in software or hardware programs. The controller controls the switching on or off of the switching devices based on input signals. The input signals to the controller come from the on / off state of the two conductors communicatively connected to the controller.

[0032] like Figure 2As shown, when energy storage power supply 2 and energy storage power supply 1 are stacked and operated in parallel, the pins on the top parallel operation plug of energy storage power supply 1 are connected to the sockets on the bottom parallel operation socket of energy storage power supply 2. Pin A1 is inserted into socket B1, pin A2 into socket B2, pin A3 into socket B3, and pin A4 into socket B4. Since sockets B1 and B2 are shorted together, and pins A3 and A4 are shorted together, pins A1 and A2 on the stacking parallel operation plug of energy storage power supply 1 are connected together through the shorted B1 / B2 sockets of energy storage power supply 2. Similarly, pins B3 and B4 on the stacking parallel operation socket of energy storage power supply 2 are connected together through the shorted A3 / A4 pins of energy storage power supply 1. In this way, the controller in energy storage power supply 1 receives the A1 / A2 stacking plug connection signal and supplies power to the relay A coil in energy storage power supply 1. Relay A then connects the live and neutral wires between the top stacking parallel operation plug of energy storage power supply 1 and the inverter output. Simultaneously, the controller in energy storage power supply 2 receives the B3 / B4 stacking socket connection signal and supplies power to the relay B coil in energy storage power supply 2. Relay B connects the live and neutral wires between the bottom stacking parallel socket of energy storage power supply 2 and the inverter output. Since energy storage power supply 1 and energy storage power supply 2 are stacked vertically, the live and neutral wires of the parallel connection pins on the top of energy storage power supply 1 are inserted into the live and neutral wires of the parallel connection socket on the bottom of energy storage power supply 2. When the contacts of relay A and relay B are both closed, it is equivalent to connecting the inverter output terminals of energy storage power supply 1 and energy storage power supply 2 together through the parallel interface. The power output from the two energy storage power inverters can be superimposed through the connection of the parallel interface. The superimposed power can be output externally through the output interface of either or both devices, achieving a doubling of power or voltage output.

[0033] When the parallel interfaces of the two energy storage power supplies are not connected together, the conductors of the A1 / A2 parallel connector and the B1 / B2 parallel connector on the two parallel interfaces are in a separated and non-conductive state. Similarly, the conductors of the A3 / A4 parallel connector and the B3 / B4 parallel connector are in a separated and non-conductive state. The controller in the energy storage power supply receives a signal that the stacked plug and socket are disconnected. At this time, the controller will not supply power to the relay coil, and the relay contacts will disconnect the N-neutral / L-live line between the inverter output and the parallel interface. At this time, the inverter cannot output power to the outside through the parallel interface, and the exposed parallel interface will not be energized, so there is no risk of electric shock.

[0034] like Figure 2As shown, when energy storage power supply 2 and energy storage power supply 1 are stacked and connected in parallel, the A1 / A2 / A3 / A4 pins on the parallel connection plug are paired and connected to the B1 / B2 / B3 / B4 sockets on the stacking parallel connection socket to send switching signals to the controller. Since the switching signal power is very small and the transmitted current is almost zero, these pins and sockets have relatively small diameters. The neutral and live wire pins on the parallel connection plug are paired and connected to the neutral and live wire sockets on the parallel connection socket to connect the power output of the two energy storage power supplies. Since the inverter output power is large, the conducted current is also large, so the diameters of these parallel connection pins and sockets are relatively large. Therefore, the diameter of the pins or sockets connected to the inverter output is larger than the diameter of the pins or sockets connected to the controller.

[0035] In this embodiment, the inverter is a single-phase inverter, and the energy storage power supply is a single-phase energy storage power supply. The output of the single-phase inverter consists of one neutral (N) wire and one live (L) wire. The parallel connection pins of the NA neutral / LA live wires on the top parallel connector of the single-phase energy storage power supply are connected to the N / L wires at the inverter output terminal via relay A. The parallel connection sockets of the NB neutral / LB live wires on the bottom parallel socket of the energy storage power supply are connected to the N / L wires at the inverter output terminal via relay B. At this time, relays A and B each have two contacts. If the single-phase inverter is not connected to a neutral wire, at least one pin or socket on the parallel connector and parallel socket must be connected to the L live wire at the inverter output terminal. At this time, relays A and B each have one contact.

[0036] In this embodiment, a relay is used as the switching device. However, in some other embodiments, the switching device may be made of similar electronic devices such as silicon controlled rectifiers or MOSFETs, which can be used to replace the relay to perform the on / off operation of the circuit.

[0037] Furthermore, it should be noted that the inverter in this patent is an inverter with the basic function of converting direct current to alternating current. Depending on the needs, the controller and relays in this patent can also be integrated into the inverter to form an inverter with parallel control functionality. This is merely a simple combination and superposition of the core elements of this patent; the substantive content of the technical solution remains unchanged and still falls within the scope of protection of this patent.

[0038] Example 2

[0039] like Figure 3 and Figure 4As shown, the difference between this embodiment and Embodiment 1 is that the inverter in Embodiment 1 is a single-phase inverter, while in this embodiment, the inverter is a three-phase inverter, and the energy storage power supply for the three-phase inverter is a three-phase energy storage power supply. For the three-phase inverter, the inverter output consists of one neutral (N) wire and three live (L1 / L2 / L3) wires. The parallel connection pins of the NA neutral wire and L1A / L2A / L3A live wires on the top parallel connector of the three-phase energy storage power supply are connected to the N / L1 / L2 / L3 wires at the inverter output end through relay A. The parallel connection sockets of the NB neutral wire and L1B / L2B / L3B live wires on the bottom parallel socket of the energy storage power supply are connected to the N / L1 / L2 / L3 wires at the inverter output end through relay B. At this time, relays A and B each have four contacts. If the three-phase inverter is not connected to the neutral wire, then at least three pins or sockets on the parallel plug and parallel socket must be connected to the live wires of the inverter's output terminals L1 / L2 / L3. At this time, relays A and B each have three contacts.

[0040] Example 3

[0041] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the inverter in embodiment 1 does not have a parallel communication interface, while in this embodiment, the inverter has a parallel communication interface, which is connected to the corresponding conductors on the parallel plug and parallel socket. The controller has a parallel control switch, which is electrically connected to the parallel communication interface.

[0042] The working principle of this invention is as follows: A relay is installed between the inverter output terminal and the parallel interface of the energy storage power supply. The controller controls the circuit connection and disconnection through the relay based on whether the parallel interface is paired and connected. Only when the pins and sockets on the top parallel plug and bottom parallel socket of the two energy storage power supplies are plugged in and connected will the relay connect the line between the neutral and live wires of the parallel interface and the inverter output terminal. At this time, the neutral and live wires of the parallel interface will be energized. The two energy storage power supplies can be stacked to connect the inverter output terminals together without the need for an additional parallel device. Parallel operation is very convenient and can quickly achieve a doubling of power or voltage output. The control system designed for the parallel interface of the energy storage power supply in this invention ensures that the exposed neutral and live wires of the parallel interface will not be energized when not in parallel operation, fundamentally eliminating the risk of electric shock and safety hazards, and avoiding accidental short circuit damage to the energy storage power supply. It has obvious advantages of convenient operation, safety and reliability, and low cost, and is very suitable for application in various energy storage power supply products, with significant technical advantages.

[0043] In summary, this utility model addresses the shortcomings of existing parallel operation functions in energy storage power supplies by providing automatically aligned parallel operation interfaces at the top and bottom of the power supply. Typically, the top houses the parallel operation plug, and the bottom the parallel operation socket. Two devices can be quickly connected via a stacked configuration, with the metal pins on the plug inserted into the metal socket holes, enabling rapid parallel operation of the two energy storage power supplies. After parallel operation, appliances can draw double the power from the output interface of one device, while the power from the other device is supplied to the parallel-connected device via its parallel operation interface. Furthermore, existing parallel interfaces are energized even when not in parallel operation, typically using 100-240VAC high-voltage electricity. To prevent accidental electric shock or short circuit damage to equipment caused by exposed metal pins or sockets of the parallel interface, this invention designs a special control system for the parallel interface. This system ensures that the exposed parallel interface will not be energized when not in parallel operation and when the parallel plug is not inserted into the parallel socket, fundamentally eliminating safety risks and hidden dangers. It has significant advantages in terms of convenient operation, safety, reliability, and low cost.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A parallel control system for an energy storage power source, characterized in that, The system includes an energy storage power supply, and batteries, inverters, switches, AC output interfaces, parallel interfaces, and controllers housed within the energy storage power supply, wherein: The input terminal of the inverter is electrically connected to the battery, and the output terminal of the inverter is electrically connected to the switch and the AC output interface; the switch is electrically connected to the parallel interface and is communicatively connected to the controller, and the switching on or off is controlled by the controller. The parallel interface is provided with multiple conductors that are insulated from each other. At least one conductor is connected to the inverter output terminal through a switch. At least two conductors are shorted together. At least two conductors are connected to the signal input terminal of the controller. When the parallel interfaces of two energy storage power supplies are connected together, the corresponding conductors on the two parallel interfaces make contact and conduct. The two shorted conductors on one of the parallel interfaces connect to the two conductors connected to the controller. After receiving the connection signal, the controller controls the switch to perform the action of connecting the line between the inverter output terminal and the parallel interface.

2. The parallel control system for an energy storage power source according to claim 1, characterized in that, The switching element includes a relay, whose contacts control the connection or disconnection of the line between the inverter output and the parallel interface.

3. The parallel control system for an energy storage power source according to claim 2, characterized in that, The relay includes a relay coil, which is powered by a controller. When the controller supplies power to the coil, the relay contacts are closed; when the controller does not supply power to the coil, the relay contacts are open. The controller is powered by a battery.

4. The parallel control system for an energy storage power source according to claim 2, characterized in that, The relay is equipped with multiple contacts, each of which is connected to a corresponding conductor on the parallel interface. The on / off control signal of the relay is generated when other conductors on the parallel interface of the two energy storage power supplies come into contact or separate. The controller controls the relay contacts to open or close according to the on / off control signal.

5. The parallel control system for an energy storage power source according to claim 1, characterized in that, The conductor of the parallel interface includes paired metal pins and sockets. In the parallel operation of two energy storage power supplies, the conductor of one of the parallel interfaces is a pin, and the conductor of the other parallel interface is a socket. The pin is inserted into the socket to achieve conductor contact and conduction.

6. The parallel control system for an energy storage power source according to claim 5, characterized in that, The diameter of the pins or sockets connected to the output terminal of the inverter is larger than the diameter of the pins or sockets connected to the controller.

7. The parallel control system for an energy storage power source according to claim 6, characterized in that, The inverter is a single-phase inverter, and there is at least one pin or socket connected to the output terminal of the inverter, and the pin or socket is connected to the live wire L of the single-phase output terminal of the inverter.

8. The parallel control system for an energy storage power source according to claim 6, characterized in that, The inverter is a three-phase inverter, with at least three pins or sockets connected to the inverter output terminal, and these three pins or sockets are respectively connected to the three live wires L1 / L2 / L3 of the three-phase output terminal of the inverter.

9. A parallel control system for an energy storage power source according to claim 5, characterized in that, The energy storage power supply is equipped with two parallel interfaces. Each parallel interface is connected to the output terminal of the inverter through a corresponding switch. One parallel interface integrates metal pins of various diameters to form a parallel plug, and the other parallel interface integrates metal sockets of various diameters to form a parallel socket. The parallel plug is located on the top of the energy storage power supply, and the parallel socket is located on the bottom of the energy storage power supply. When two energy storage power supplies are stacked on top of each other, the parallel plug of the lower energy storage power supply is plugged into the parallel socket of the upper energy storage power supply to achieve the connection and conduction of the parallel interfaces of the two energy storage power supplies.

10. A parallel control system for an energy storage power source according to claim 9, characterized in that, The inverter has a parallel communication interface, which is connected to the corresponding conductors on the parallel plug and the parallel socket. The controller has a parallel control switch, which is electrically connected to the parallel communication interface.

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