Household energy storage device and distribution box intelligent control device

Abstract

The invention discloses a household energy storage device and a distribution box intelligent control device. The household energy storage device comprises a first communication module, an inversion module and an energy storage module. The input end of the first communication module is in communication connection with the distribution box; the output end of the first communication module is in communication connection with the input end of the inversion module; the first IO end of the inversion module is connected to a home circuit, and the second IO end of the inversion module is electrically connected with the energy storage module; the first communication module is used for receiving power-on and power-off signals of a power distribution box and sending the power-on and power-off signals to the inversion module. The inversion module adjusts the alternating current and direct current conversion directions of the first IO end and the second IO end according to the power-on and power-off signals of the input end; the energy storage module is used for storing electric energy through the household circuit or providing electric energy for the household circuit. By adopting the embodiment of the invention, the stable power supply of the household circuit can be ensured, the plug and play of the household energy storage device is realized, and the installation difficulty and the time cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and in particular to a household energy storage device and an intelligent control device for a distribution box. Background Art

[0003] The mainstream household energy storage devices on the market currently use lithium iron phosphate battery packs and off-grid inverters. By modifying the household distribution box, a new distribution box is added outside the original main distribution box, and the energy storage device is connected in series into the household circuit.

[0004] However, existing household energy storage devices require major modifications to the household distribution box, and household energy storage products need to be close to the distribution box, which limits the placement of household energy storage products. In addition, the modification of the household distribution box takes 6-8 hours to complete, and the installation time cost is high. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to conveniently supply power to household circuits when a power outage occurs. A household energy storage device and an intelligent control device for a distribution box are provided, which can realize automatic charging and discharging of the household energy storage device, ensure stable power supply to the household circuit, and realize plug-and-play of the household energy storage device, thereby reducing the difficulty and time cost of installation.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a household energy storage device, wherein the city power is input into the household circuit through a distribution box, and the household energy storage device comprises a first communication module, an inverter module, and an energy storage module;

[0007] The input end of the first communication module is connected to the distribution box; the output end of the first communication module is connected to the input end of the inverter module; the first IO end of the inverter module is connected to the household circuit, and the second IO end of the inverter module is electrically connected to the energy storage module;

[0008] The first communication module is used to receive the power on / off signal of the distribution box and send the power on / off signal to the inverter module; the inverter module is used to adjust the AC / DC conversion direction of the first IO terminal and the second IO terminal according to the power on / off signal of the input terminal; the energy storage module is used to store electrical energy through the household circuit or provide electrical energy to the household circuit.

[0009] As an improvement of the above solution, the inverter module includes an inverter state control unit, an AC / DC conversion unit, and an AC power transmission unit;

[0010] The input end of the inverter control unit is communicatively connected to the first communication module; the output end of the inverter control unit is communicatively connected to the first end of the AC / DC conversion unit; the second end of the AC / DC conversion unit is connected to the first IO end of the inverter module through the AC power transmission unit, and the third end of the AC / DC conversion unit is electrically connected to the energy storage module through the second IO end of the inverter module.

[0011] As an improvement of the above scheme, the household energy storage device also includes a photovoltaic input module; the output end of the photovoltaic input module is electrically connected to the inverter module and connected to the household circuit through the first IO end of the inverter module; the photovoltaic input module includes a photovoltaic array for converting the collected light energy into electrical energy.

[0012] The embodiment of the present invention further provides an intelligent control device for a power distribution box, which is installed in the power distribution box. The intelligent control device for the power distribution box includes a power module and a second communication module;

[0013] The mains power is connected to the input end of the power module through the input end of the distribution box, and the output end of the power module is electrically connected to the input end of the second communication module; the output end of the second communication module is communicatively connected to the household energy storage device as described above;

[0014] The power supply module is used to supply power to the second communication module; the second communication module is used to send a power on / off signal of the distribution box to the household energy storage device.

[0015] As an improvement of the above solution, the intelligent control device for the power distribution box further includes a time delay relay module and a contactor module;

[0016] The city power is connected to the input end of the delay relay module through the input end of the distribution box; the output end of the delay relay module is electrically connected to the input end of the contactor module; the output end of the contactor module is electrically connected to the household circuit formed by the distribution box;

[0017] The time delay relay module is used to delay the on and off of the contactor module; the contactor module is used to control the household circuit to access the mains.

[0018] As an improvement of the above scheme, the contactor module includes an electromagnetic unit and a normally open contact unit, the electromagnetic unit connects the delay relay module and the normally open contact unit; the normally open contact unit is connected to the live wire and the neutral wire of the household circuit formed by the distribution box to control the power supply of the household circuit; the electromagnetic unit includes a coil, a static iron core and a moving iron core.

[0019] Compared with the prior art, the present invention discloses a household energy storage device and a distribution box intelligent control device, wherein the household energy storage device comprises a first communication module, an inverter module, and an energy storage module; the input end of the first communication module is connected to the distribution box for communication; the output end of the first communication module is connected to the input end of the inverter module for communication; the first IO end of the inverter module is connected to the household circuit, and the second IO end of the inverter module is electrically connected to the energy storage module; the first communication module is used to receive the power-on / off signal of the distribution box and send the power-on / off signal to the inverter module; the inverter module is used to adjust the AC / DC conversion direction of the first IO end and the second IO end according to the power-on / off signal of the input end; the energy storage module is used to store electric energy through the household circuit or provide electric energy to the household circuit. By adopting the embodiment of the present invention, the household energy storage device can be automatically charged and discharged, the stable power supply of the household circuit is guaranteed, and the household energy storage device can be plug-and-play, which reduces the installation difficulty and time cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the circuit structure of a traditional household energy storage device connected to a household distribution box;

[0021] Figure 2 is a structural schematic diagram of a household energy storage device provided by an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a household energy storage device provided by an embodiment of the present invention and a circuit structure of the device connected to a distribution box;

[0023] Figure 4 is a schematic diagram of a circuit structure of an inverter module provided by an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of an intelligent control device for a power distribution box provided by an embodiment of the present invention;

[0025] Figure 6 The present invention provides a circuit diagram of an intelligent control device for a power distribution box. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the specification and claims, it is to be understood that the terms first, second, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0028] Existing household energy storage devices use lithium iron phosphate battery packs and off-grid inverters. During installation, it is necessary to make major modifications to the household distribution box in order to connect the household energy storage device in series into the household circuit.

[0029] See also Figure 1 When installing an existing household energy storage device, the transformation of the distribution box is generally to add a new distribution box on the basis of the original main distribution box. The newly added distribution box includes a mains circuit breaker, a load circuit breaker, a photovoltaic circuit breaker, and a bypass switch. One end of the mains circuit breaker is connected to the main switch, and the other end of the mains circuit breaker is electrically connected to the AC input port of the household energy storage device; the AC output port of the household energy storage device forms the household circuit power input end of the main distribution box through the load circuit breaker.

[0030] The battery capacity of this type of household energy storage device is usually 5kWh-20kWh, and the inverter power is 5kW-15kW. It can be compatible with the grid, photovoltaic and diesel generators to charge the battery or directly carry the load, which can usually fully meet various household electricity needs. In the event of a power outage, the household power supply can be guaranteed for up to 1-2 days to achieve energy independence.

[0031] However, existing household energy storage devices have at least the following disadvantages: (1) The wiring ports require manual wire stripping and wiring, and do not support quick plug-in and unplugging; (2) An AC output port needs to be set up on the household energy storage device to charge household electronic devices, which leads to port redundancy; (3) The original distribution box needs to be modified during installation, and a new distribution box and manual wiring are required during the process, which is difficult and time-consuming; (4) Since it is directly connected to the distribution box during installation, its placement is limited, and it cannot take into account outdoor mobile usage scenarios.

[0032] Based on the above considerations, an embodiment of the present invention provides a household energy storage device. Figure 2 and Figure 3 In this embodiment, the household energy storage device 10 includes a first communication module 11, an inverter module 12, and an energy storage module 13;

[0033] The input end of the first communication module 11 is connected to the distribution box; the output end of the first communication module 11 is connected to the input end of the inverter module 12; the first IO end of the inverter module 12 is connected to the household circuit, and the second IO end of the inverter module 12 is electrically connected to the energy storage module 13;

[0034] The first communication module 11 is used to receive the power on / off signal of the distribution box and send the power on / off signal to the inverter module 12; the inverter module 12 is used to adjust the AC / DC conversion direction of the first IO terminal and the second IO terminal according to the power on / off signal of the input terminal; the energy storage module 13 is used to store electrical energy through a household circuit or provide electrical energy to a household circuit.

[0035] It should be noted that the energy storage module 13 may be a device capable of charging and discharging, such as a battery or a supercapacitor, or a flow battery, etc. The specific battery form used in the energy storage module does not affect the beneficial effects of the present invention.

[0036] In the embodiment of the present invention, the inverter module 12 has three ports, namely, an input port, a first IO port, and a second IO port. The input port only receives communication signals; the first IO port realizes the AC input and output connection between the household energy storage device and the household circuit; the second IO port realizes the DC input and output connection between the inverter module and the energy storage module inside the household energy storage device. That is, in the embodiment of the present invention, the household energy storage device has only one AC input and output port, which is obtained by improving the traditional inverter, specifically, merging the original AC input port and AC output port.

[0037] For example, see Figure 3 , the embodiment of the present invention provides a specific application scenario of a household energy storage device. When the power-on / off signal received by the first communication module 11 indicates that the mains is normally connected, the power-on / off signal is sent to the inverter module 12, so that the inverter module 12 obtains electric energy from the household circuit through the first IO terminal. At this time, the household energy storage device can be regarded as an electrical device, which is connected to the household circuit like other electrical devices in the household circuit. Then, the inverter module 12 performs grid-connected charging, converts the AC signal obtained from the household circuit into a DC signal, supplies power to the energy storage module 13, and realizes the charging of the energy storage module 13. When the power-on / off signal received by the first communication module 11 indicates that the mains is disconnected, the power-on / off signal is sent to the inverter module 12 to stop charging the inverter module 12 and switch to an off-grid discharge mode, obtaining electric energy from the energy storage module 13 through the second IO terminal. At this time, the energy storage module 13 discharges to generate a direct current. The inverter module 12 then converts the direct current into an alternating current, and then provides electric energy to the household circuit through the first IO terminal. The household energy storage device 10 serves as the power input of the household circuit.

[0038] Preferably, the first IO terminal of the inverter module 12 is a triangular plug port. When connecting the inverter module 12 and the household circuit, a triangular plug conversion line is used, one end of the triangular plug conversion line is a triangular plug female head, and the other end is a triangular plug male head. The triangular plug male head end is directly connected to the triangular socket in the household circuit, and the triangular plug female head is directly connected to the inverter module 12.

[0039] As a preferred implementation, the inverter module 12 includes an inverter state control unit 121, an AC / DC conversion unit 122, and an AC power transmission unit 123;

[0040] The input end of the inverter control unit 121 is communicatively connected to the first communication module 11; the output end of the inverter control unit 121 is communicatively connected to the first end of the AC / DC conversion unit 122; the second end of the AC / DC conversion unit 122 is connected to the first IO end of the inverter module 12 through the AC power transmission unit 123, and the third end of the AC / DC conversion unit 122 is electrically connected to the energy storage module 13 through the second IO end of the inverter module 12.

[0041] It should be noted that the inverter module 12 has two working modes, one is the grid-connected mode and the other is the off-grid mode. In the embodiment of the present invention, the switching of the working mode of the inverter module 12 is realized by the inverter control unit 121. In the grid-connected mode, the inverter module 12 converts direct current into alternating current through the AC / DC conversion unit 122, and then integrates the alternating current into the public power grid through the AC transmission unit 123. The parameters such as the frequency, phase and amplitude of the output alternating current need to be strictly matched with the power grid to ensure the stable injection of electric energy and the safe operation of the power grid. In the off-grid mode, the inverter module 12 operates independently of the power grid, converts the direct current output by the energy storage module 13 into alternating current through the AC / DC conversion unit 122, and then provides alternating current to the local load through the AC transmission unit 123. In the embodiment of the present invention, the local load is connected through the household circuit.

[0042] For example, the circuit structure of the inverter module 12 is as follows: Figure 4 As shown. Figure 4 In the figure, BAT+ and BAT- ports are connected to the energy storage module 13, L and N are the live wire and neutral wire drawn from the distribution box; the circuit from BUS+ and BUS- to the L line and the N line is the AC-DC conversion unit in the inverter module.

[0043] It should be noted that if the energy storage work of the household energy storage device can be completed by other modules or units besides the energy storage module 13, the bidirectional IO ports of other energy storage modules or units are directly connected to the BUS+ and BUS- ports of the inverter module 13 so that they can be converted into AC power for output.

[0044] In some preferred embodiments, the inverter module 12 further includes a filter unit.

[0045] As an improvement of the above solution, the household energy storage device 10 also includes a photovoltaic input module 14; the output end of the photovoltaic input module 14 is electrically connected to the inverter module 12, and is connected to the household circuit through the first IO end of the inverter module 12; the photovoltaic input module 14 includes a photovoltaic array for converting the collected light energy into electrical energy.

[0046] It should be noted that in the embodiment of the present invention, the photovoltaic input module itself can store electric energy through the photovoltaic array, so it does not need to be directly connected to the energy storage module 13, but when it outputs electric energy, it needs to power the household circuit through the first IO terminal of the inverter module, and at this time, it is necessary to coordinate the power supply between the photovoltaic input module 14 and the energy storage module 13. However, the coordination process is relatively conventional and simple in this field, and will not be described in detail here.

[0047] Correspondingly, in the embodiment of the present invention, when installing the household energy storage device, the conventional distribution box needs to be modified. The embodiment of the present invention also provides a distribution box intelligent control device 20, which is installed in the distribution box. Figure 5 , the distribution box intelligent control device 20 includes a power module 21 and a second communication module 22;

[0048] The city power is connected to the input end of the power module 21 through the input end of the distribution box, and the output end of the power module 21 is electrically connected to the input end of the second communication module 22; the output end of the second communication module 22 is communicatively connected to the household energy storage device 10 as described above;

[0049] The power supply module 21 is used to supply power to the second communication module 22 ; the second communication module 22 is used to send a power on / off signal of the distribution box to the household energy storage device 10 .

[0050] It can be understood that in the embodiment of the present invention, there is no need to make complex modifications to the distribution box. The distribution box intelligent control device 20 only needs to be installed in the existing distribution box to realize the plug-and-play user energy storage device 10, and can automatically perform charging and discharging operations.

[0051] Traditional distribution boxes generally control whether the mains power is input into the household circuit through a main switch. In some preferred embodiments, the distribution box intelligent control device 20 is installed between the main switch and the household circuit. It is controlled by the main switch and can be further connected to the household circuit. More preferably, it can obtain the power consumption of the household circuit and control the household circuit.

[0052] As a preferred implementation, see Figure 5, the distribution box intelligent control device 20 also includes a delay relay module 23 and a contactor module 24;

[0053] The city power is connected to the input end of the delay relay module 23 through the input end of the distribution box; the output end of the delay relay module 23 is electrically connected to the input end of the contactor module 24; the output end of the contactor module 24 is electrically connected to the household circuit formed by the distribution box;

[0054] The delay relay module 23 is used to delay the on and off of the contactor module 24; the contactor module 24 is used to control the household circuit to access the mains.

[0055] In some preferred embodiments, see Figure 5 and Figure 6 The contactor module 24 includes an electromagnetic unit and a normally open contact unit, the electromagnetic unit connects the delay relay module 23 and the normally open contact unit; the normally open contact is connected to the live wire and the neutral wire of the household circuit formed by the distribution box to control the power supply of the household circuit; the electromagnetic unit includes a coil, a static iron core and a moving iron core.

[0056] It should be noted that Figure 6 The communication module in is the second communication module, which is installed on the distribution box intelligent control device 20, and the first communication module is installed on the household energy storage device 10, and the two can communicate.

[0057] When the mains is on, the coil of the contactor will be energized, and a magnetic field will be generated in the coil according to the principle of electromagnetic induction. The magnetic field magnetizes the static iron core, generating electromagnetic attraction, attracting the moving iron core to move toward the static iron core, so as to control the closing of both normally open contacts, and at this time, the power supply for the household circuit is realized; when the mains is disconnected, the contactor coil is de-energized, the current in the coil rapidly decreases to zero, and the magnetic field disappears. The static iron core loses its magnetism, and the electromagnetic attraction no longer exists, so as to control the disconnection of both normally open contacts, and at this time, the power supply for the household circuit is disconnected.

[0058] It should be noted that in the embodiment of the present invention, the contactor module is controlled to be disconnected during a power outage, and the contactor module is controlled to be closed after a delay when a power is restored, which can provide a time difference for the inverter module of the household energy storage device to convert from off-grid power supply to grid-connected charging.

[0059] In some preferred embodiments, when the mains power comes in, the delay relay module 23 controls the contactor module 24 to close after a delay of 3 seconds, and the distribution box intelligent control device 20 is in a closed state. At the same time, the second communication module 22 sends a GridOn signal to the household energy storage device 10, so that the inverter module 12 stops off-grid discharge and switches to a grid-connected charging mode; when the mains power is cut off, the delay relay module 23 controls the contactor module 24 to disconnect, the distribution box intelligent control device 20 is in a disconnected state, and the household circuit becomes an off-grid circuit. At the same time, the second communication module 22 sends a GridOff signal to the household energy storage device 10. After the household energy storage device 10 confirms the GridOff state, the inverter module 12 switches from a charging mode to an off-grid discharge mode to supply power to the household circuit. The above scheme realizes the automatic switching of the household circuit and the household energy storage device 10 when the mains power comes in and the power is cut off, and at the same time ensures that this power supply mode does not conflict with the operation of the power grid, and ensures the safe use of electricity by maintenance personnel and family members.

[0060] By using a distribution box intelligent control device provided by an embodiment of the present invention, the household energy storage device as described above can be connected to the household circuit through a simple modification of the distribution box, so as to achieve plug-and-play of the household energy storage device, and can achieve automatic closing after a delay when the city power is supplied, and automatic disconnection when the city power is cut off. Compared with the traditional method, the modification of the distribution box is simple, and the time difference of the inverter module of the household energy storage device when performing off-grid and grid-connected conversion can be further considered.

[0061] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A household energy storage device, characterized in that: The city electricity is input into the household circuit through the distribution box, and the household energy storage device includes a first communication module, an inverter module, and an energy storage module; The input end of the first communication module is connected to the distribution box; the output end of the first communication module is connected to the input end of the inverter module; the first IO end of the inverter module is connected to the household circuit, and the second IO end of the inverter module is electrically connected to the energy storage module; The first communication module is used to receive the power on / off signal of the power distribution box and send the power on / off signal to the inverter module; The inverter module is used to adjust the AC / DC conversion direction of the first IO terminal and the second IO terminal according to the on / off power signal of the input terminal; the energy storage module is used to store electric energy through the household circuit or provide electric energy to the household circuit.

2. A household energy storage device as claimed in claim 1, characterized in that: The inverter module includes an inverter state control unit, an AC / DC conversion unit, and an AC power transmission unit; The input end of the inverter control unit is communicatively connected to the first communication module; the output end of the inverter control unit is communicatively connected to the first end of the AC / DC conversion unit; the second end of the AC / DC conversion unit is connected to the first IO end of the inverter module through the AC power transmission unit, and the third end of the AC / DC conversion unit is electrically connected to the energy storage module through the second IO end of the inverter module.

3. A household energy storage device as claimed in claim 1, characterized in that: The household energy storage device also includes a photovoltaic input module; the output end of the photovoltaic input module is electrically connected to the inverter module and connected to the household circuit through the first IO end of the inverter module; the photovoltaic input module includes a photovoltaic array for converting the collected light energy into electrical energy.

4. An intelligent control device for a distribution box, characterized in that: Installed in a power distribution box, the power distribution box intelligent control device includes a power module and a second communication module; The mains power is connected to the input end of the power module through the input end of the distribution box, and the output end of the power module is electrically connected to the input end of the second communication module; the output end of the second communication module is communicatively connected to the household energy storage device according to any one of claims 1 to 3; The power supply module is used to supply power to the second communication module; the second communication module is used to send a power on / off signal of the distribution box to the household energy storage device.

5. The intelligent control device for a power distribution box according to claim 4, characterized in that: The distribution box intelligent control device also includes a time delay relay module and a contactor module; The city power is connected to the input end of the delay relay module through the input end of the distribution box; the output end of the delay relay module is electrically connected to the input end of the contactor module; the output end of the contactor module is electrically connected to the household circuit formed by the distribution box; The delay relay module is used to delay the on and off of the contactor module; The contactor module is used to control the household circuit to access the mains.

6. The intelligent control device for a power distribution box according to claim 5, characterized in that: The contactor module includes an electromagnetic unit and a normally open contact unit, the electromagnetic unit connects the time delay relay module and the normally open contact unit; the normally open contact unit is connected to the live wire and the neutral wire of the household circuit formed by the distribution box to control the power supply of the household circuit; the electromagnetic unit includes a coil, a static iron core and a moving iron core.

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