A household distributed energy storage system and distributed energy storage device

Abstract

The present invention discloses a household distributed energy storage system and distributed energy storage equipment, wherein the energy storage system includes: a plurality of energy storage units and a power management unit; the energy storage units are distributed in the house, and the plurality of energy storage units are connected by wires; the power management unit is respectively connected to the plurality of energy storage units; the power management unit is used to detect the remaining power of each of the energy storage units, and identify the energy storage unit with the largest remaining power as the output energy storage unit; the power management unit is also used to output a voltage conversion signal to the output energy storage unit; the output energy storage unit is used to output a corresponding voltage to other energy storage units according to the voltage conversion signal. The present invention determines the output energy storage unit according to the remaining power of each energy storage unit through the voltage management unit, and outputs a voltage conversion signal to the output energy storage unit, so that the energy storage unit outputs the corresponding voltage to charge other energy storage units, thereby realizing electric energy distribution and improving energy utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a household distributed energy storage system and distributed energy storage equipment. Background Art

[0002] The home energy storage system stores electrical energy in normal times and outputs it to power the home in emergencies.

[0003] Existing home energy storage systems are connected to the power grid or new energy power generation equipment to store energy, and are connected to the home circuit to supply power to the home. When the power grid stops transmitting electricity and the energy storage system is running, the energy storage units scattered throughout the house start to supply power. However, due to the inconsistent power supply requirements of the locations of the energy storage units, there is a situation where the energy storage units with large power supply requirements are exhausted, while the energy storage units with small power supply requirements are fully charged, resulting in low energy utilization. Summary of the invention

[0004] The main purpose of the present invention is to provide a household distributed energy storage system and distributed energy storage equipment, aiming to improve energy utilization.

[0005] To achieve the above object, the present invention proposes a household distributed energy storage system, which includes:

[0006] Multiple energy storage units and power management units;

[0007] The energy storage units are distributed in the house, and the multiple energy storage units are connected by wires;

[0008] The power management unit is connected to the multiple energy storage units respectively;

[0009] The power management unit is used to detect the remaining power of each of the energy storage units, and identify the energy storage unit with the largest remaining power as the output energy storage unit;

[0010] The power management unit is further used to output a voltage conversion signal to the output energy storage unit;

[0011] The output energy storage unit is used to output the corresponding voltage to other energy storage units according to the voltage conversion signal;

[0012] The topological structure formed by the multiple energy storage units and the wires is a ring topological structure;

[0013] The energy storage unit comprises:

[0014] Battery components;

[0015] A switch circuit, a first end of which is connected to the wires connecting the multiple energy storage units, and a second end of which is connected to the battery assembly;

[0016] a voltage conversion circuit, an input end of which is connected to the battery, and an output end of which is connected to the third end of the switch circuit;

[0017] A control circuit, wherein a communication end of the control circuit is connected to the power management unit, a second end is connected to the voltage conversion circuit, and a third end is connected to the switch circuit; the control circuit is used to control the output of the voltage conversion circuit to convert the output voltage of the battery into a corresponding voltage and then output it when receiving the voltage conversion signal, and control the switch circuit to turn on the electrical circuit between its first end and the third end, and turn off the electrical circuit between its first end and the second end.

[0018] Optionally, the power management unit is communicatively connected to the multiple energy storage units, and the multiple energy storage units respectively output remaining power information and demand information to the power management unit, and the power management unit is used to determine the output energy storage unit and the input energy storage unit according to the remaining power information and demand information output by the multiple energy storage units;

[0019] The power management unit is used to output a voltage conversion signal to the output energy storage unit, and output a receiving signal to the input energy storage unit so that the output energy storage unit outputs a corresponding voltage to the input energy storage unit.

[0020] Optionally, the power management unit includes:

[0021] A voltage detection circuit, the voltage detection circuit is connected to each of the energy storage units and is used to detect the output voltage of each of the energy storage units;

[0022] A main control circuit, wherein the main control circuit is respectively connected to the output end of the voltage detection circuit and the plurality of energy storage units; the main control circuit is used to determine the output energy storage unit according to the output voltage, and output a corresponding voltage conversion signal to the output energy storage unit, so that the output energy storage unit charges other energy storage units.

[0023] Optionally, the switch circuit includes:

[0024] A first resistor, a second resistor, a third resistor, a first diode, a first transistor, a first PMOS transistor, a first NMOS transistor, and a second NMOS transistor;

[0025] The anode of the first diode is connected to the third end of the control circuit, and the cathode is connected to the first end of the first resistor; the second end of the first resistor is connected to the base of the first transistor and the first end of the second resistor; the second end of the second resistor is connected to the emitter of the first transistor and grounded; the collector of the first transistor is connected to the second end of the third resistor, the gate of the first PMOS tube, and the gate of the first NMOS tube; the first end of the third resistor is connected to a first voltage; the drain of the first PMOS tube is connected to the output end of the voltage conversion circuit, and the source is connected to the drain of the second NMOS tube; the drain of the first NMOS tube is connected to the battery assembly, and the source is connected to the drain of the second NMOS tube; the source of the second NMOS tube is connected to the wire connecting multiple energy storage units, and the gate is connected to the fourth end of the control circuit.

[0026] Optionally, the energy storage unit further includes:

[0027] A bidirectional inverter circuit, one end of which is connected to an external AC source, the other end of which is connected to the battery assembly, and a control end of which is connected to the control circuit;

[0028] The bidirectional inverter circuit is used to rectify the AC power output by the external AC source into DC power for charging the battery assembly;

[0029] Or, the bidirectional inverter circuit is used to invert the direct current output by the battery assembly into alternating current and then output it to the external alternating current source;

[0030] The control circuit is used to control the bidirectional inverter circuit to operate when triggered by the first mode, and rectify the AC power output by the external AC source into DC power to charge the battery assembly;

[0031] Alternatively, the control circuit is further used to control the bidirectional inverter circuit to invert the direct current output by the battery assembly into alternating current and then output it to the external alternating current source when triggered by the second mode.

[0032] Optionally, the external AC source includes at least one of a power grid, a solar panel and a wind turbine.

[0033] The present invention also provides a distributed energy storage device, which includes the household distributed energy storage system.

[0034] The present invention discloses a household distributed energy storage system and distributed energy storage equipment, wherein the energy storage system comprises: a plurality of energy storage units and a power management unit; the energy storage units are distributed in a house, and the plurality of energy storage units are connected by wires; the power management unit is respectively connected to the plurality of energy storage units; the power management unit is used to detect the remaining power of each of the energy storage units, and identify the energy storage unit with the largest remaining power as an output energy storage unit; the power management unit is also used to output a voltage conversion signal to the output energy storage unit; the output energy storage unit is used to output a corresponding voltage to other energy storage units according to the voltage conversion signal. The topological structure composed of the multiple energy storage units and the wires is a ring topological structure for transmitting electric energy; the energy storage unit includes: a battery assembly; a switch circuit, the first end of which is connected to the wire connecting the multiple energy storage units, and the second end is connected to the battery assembly; a voltage conversion circuit, the input end is connected to the battery, and the output end is connected to the third end of the switch circuit; a control circuit, the communication end of the control circuit is connected to the power management unit, the second end is connected to the voltage conversion circuit, and the third end is connected to the switch circuit; the control circuit is used to control the output of the voltage conversion circuit to convert the output voltage of the battery into a corresponding voltage after receiving the voltage conversion signal, and control the switch circuit to conduct the electrical circuit between its first end and the third end, and shut down the electrical circuit between its first end and the second end. The present invention determines the output energy storage unit according to the remaining power of each energy storage unit through the voltage management unit, and outputs a voltage conversion signal to the output energy storage unit, so that the energy storage unit outputs the corresponding voltage to charge other energy storage units, thereby realizing electric energy distribution and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 This is a structural schematic diagram of an embodiment of a household distributed energy storage system of the present invention;

[0037] Figure 2 It is a structural schematic diagram of another embodiment of the household distributed energy storage system of the present invention;

[0038] Figure 3 It is a structural schematic diagram of another embodiment of the household distributed energy storage system of the present invention;

[0039] Figure 4It is a structural schematic diagram of another embodiment of the household distributed energy storage system of the present invention;

[0040] Figure 5 It is a structural schematic diagram of another embodiment of the household distributed energy storage system of the present invention.

[0041] Description of Figure Numbers:

[0042]

[0043]

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] 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.

[0046] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The distributed energy storage system includes a plurality of energy storage units 10, wherein the energy storage unit 10 can be connected to an external new energy power generation device, including a solar panel or a wind turbine. The energy storage unit 10 can store the electric energy output by the connected new energy power generation device; it should be noted that the energy storage unit 10 is distributed in the house, and the new energy power generation device connected thereto is arranged outdoors or on a window between the house and the outside world. The plurality of energy storage units 10 are distributed in the house. It is easy to understand that due to the different locations of the house, the electric energy output by the power generation device connected to each energy storage unit 10 is different, that is, the electric energy stored in each energy storage unit 10 is also different; and because the functions and uses of each room in the house are different, the required power consumption is also different. For example: the kitchen has high-power electrical appliances, and the high-power electrical appliances consume a lot of electricity when in operation; the electrical appliances in the living room are mainly lamps, which require slightly less power. Therefore, the amount of electricity stored in the energy storage units 10 of each room is different, and the electricity demand is inconsistent. There is a room whose energy storage unit 10 stores less electricity due to its geographical location, but the functional attributes of the room cause the room to consume a lot of electricity, so that the energy storage unit 10 does not store enough electricity for use; in addition, there may be another room whose energy storage unit 10 stores more electricity due to its geographical location, but the functional attributes of the room cause the room to consume less electricity, so that the energy storage unit 10 in the room has sufficient electricity. In summary, due to the different geographical locations and functional attributes of the rooms in the house, the energy storage units 10 in each room of the house may be exhausted or sufficient at the same time, and the energy utilization rate is not high. This scheme aims to adjust the distribution of the amount of electricity stored in the energy storage units 10 in each room to improve energy utilization.

[0050] Reference Figure 1 The present invention proposes a household distributed energy storage system, the energy storage system comprising:

[0051] A plurality of energy storage units 10 and a power management unit 20;

[0052] The energy storage units 10 are distributed in the house, and the multiple energy storage units 10 are connected by wires;

[0053] The power management unit 20 is respectively connected to the multiple energy storage units 10;

[0054] The power management unit 20 is used to detect the remaining power of each of the energy storage units 10, and identify the energy storage unit 10 with the largest remaining power as the output energy storage unit 10;

[0055] The power management unit 20 is also used to output a voltage conversion signal to the output energy storage unit 10;

[0056] The output energy storage unit 10 is used to output a corresponding voltage to other energy storage units 10 according to the voltage conversion signal.

[0057] It should be noted that the multiple energy storage units 10 are distributed in various rooms in the house. Generally, one energy storage unit 10 can be allocated to one room. The multiple energy storage units 10 are connected by wires, and the energy storage units 10 can transmit electrical energy through the wires. The energy storage unit 10 may include a battery for storing electrical energy. The power management unit 20 is respectively connected to the multiple energy storage units 10 to detect the remaining power of each of the energy storage units 10. Among them, the power management unit 20 can be connected to the multiple energy storage end units in communication, and the power management unit 20 sends an inquiry request to the multiple energy storage units 10 through a communication protocol. After receiving the inquiry request, the multiple energy storage units 10 send the current power, output voltage, power demand information and power demand at historical moments to the power management unit 20. The power management unit 20 can determine the output energy storage unit 10 based on the power, output voltage and power demand at historical moments of each energy storage unit 10. The output energy storage unit 10 is the energy storage unit 10 that outputs voltage to the wire, and charges other energy storage units 10. In one embodiment of the present invention, considering that each room belongs to the same house and has the same longitude and latitude; in general, the power generated by the power generation device connected to the energy storage unit 10 in each room is not far apart, but the power consumption in each room is used for different electrical appliances, and there are huge differences. Therefore, the power consumption in each room becomes the main influencing factor affecting the power stored in the energy storage unit 10; it is easy to understand that the energy storage unit 10 with the most remaining power can be placed in the room with the least power consumption. In addition, the energy storage unit 10 with the most remaining power has the most abundant power. Outputting the power of the energy storage unit 10 to other energy storage units 10 can improve the energy utilization rate of the entire household distributed energy storage system. Therefore, the energy storage unit 10 with the most remaining power can be identified as the output energy storage unit 10. In addition, the output energy storage unit 10 needs to increase the output voltage, and the output voltage needs to be higher than the output voltage of other energy storage units 10 in order to charge other energy storage units 10. The output voltage is related to the output voltage of each energy storage unit 10.

[0058] In another embodiment of the present invention, the power management unit 20 determines the output energy storage unit 10 according to the power and power demand information of each energy storage unit 10; the power of each energy storage unit 10 represents the energy that can be mobilized by each energy storage unit 10 at present, and the power demand information represents whether each energy storage unit 10 needs to supply power to the outside at present. The power management unit 20 can use the energy storage unit 10 with the most remaining power among the energy storage units 10 that do not need to supply power to the outside as the output energy storage unit 10; in addition, the power management unit 20 can also determine which energy storage unit 10 needs to supply power to the outside at a certain moment according to the power demand of each energy storage unit 10 at a historical moment, and output a voltage conversion signal to the output energy storage unit 10 before the moment, so that the output energy storage unit 10 charges the energy storage unit 10 to meet the power supply demand of the energy storage unit 10 at the moment. After receiving the voltage conversion signal, the output energy storage unit 10 outputs a corresponding voltage to other energy storage units 10, and the voltage is greater than any output voltage of the other energy storage units 10.

[0059] The energy storage unit 10 may include a battery, and the power management unit 20 may include an MCU, a DSP (Digital Signal Process, digital signal processing chip 2210), an FPGA (Field Programmable Gate Array, programmable logic gate array chip), a SOC (System On Chip, system-level chip), etc.

[0060] In an embodiment of the present invention, the power management unit 20 and the energy storage unit 10 may be disposed in the same device.

[0061] The present invention discloses a household distributed energy storage system, which includes: a plurality of energy storage units 10 and a power management unit 20; the energy storage units 10 are distributed in a house, and the plurality of energy storage units 10 are connected by wires; the power management unit 20 is respectively connected to the plurality of energy storage units 10; the power management unit 20 is used to detect the remaining power of each of the energy storage units 10, and identify the energy storage unit 10 with the largest remaining power as the output energy storage unit 10; the power management unit 20 is also used to output a voltage conversion signal to the output energy storage unit 10; the output energy storage unit 10 is used to output a corresponding voltage to other energy storage units 10 according to the voltage conversion signal. The topological structure formed by the multiple energy storage units 10 and the wires is a ring topological structure; the energy storage unit 10 includes: a battery assembly 110; a switch circuit 120, a first end of which is connected to the wires connecting the multiple energy storage units 10, and a second end of which is connected to the battery assembly 110; a voltage conversion circuit 130, an input end of which is connected to the battery, and an output end of which is connected to the third end of the switch circuit 120; a control circuit 140, a communication end of which is connected to the power management unit, a second end of which is connected to the voltage conversion circuit 130, and a third end of which is connected to the switch circuit 120; the control circuit 140 is used to control the voltage conversion circuit 130 to output the output voltage of the battery converted into a corresponding voltage and then output it when receiving the voltage conversion signal, and to control the switch circuit 120 to turn on the electrical circuit between its first end and the third end, and to turn off the electrical circuit between its first end and the second end. The present invention determines the output energy storage unit 10 according to the remaining power of each energy storage unit 10 through the voltage management unit, and outputs a voltage conversion signal to the output energy storage unit 10, so that the energy storage unit 10 outputs a corresponding voltage to charge other energy storage units 10, thereby realizing electric energy distribution and improving energy utilization.

[0062] In one embodiment of the present invention, the power management unit 20 is communicatively connected with the multiple energy storage units 10, and the multiple energy storage units 10 respectively output the remaining power information and the demand information to the power management unit 20, and the power management unit 20 is used to determine the output energy storage unit 10 and the input energy storage unit 10 according to the remaining power information and the demand information output by the multiple energy storage units 10;

[0063] The power management unit 20 is used to output a voltage conversion signal to the output energy storage unit 10 , and output a receiving signal to the input energy storage unit 10 so that the output energy storage unit 10 outputs a corresponding voltage to the input energy storage unit 10 .

[0064] In this embodiment, the power management unit 20 is used to determine the output energy storage unit 10 and the input energy storage unit 10 according to the remaining power information and demand information output by the multiple energy storage units 10. The power management unit 20 can use the energy storage unit 10 that does not need to supply power to the outside and has the most remaining power as the output energy storage unit 10, and use the energy storage unit 10 that needs to supply power to the outside as the input energy storage unit 10. In particular, the power management power supply uses the energy storage unit 10 that needs to supply power to the outside and has the least remaining power as the input energy storage unit 10. The power management unit 20 also obtains the output voltage of each energy storage unit 10 from each energy storage unit 10, and the power management unit 20 outputs a voltage conversion signal to the output energy storage unit 10, so that the output voltage of the output energy storage unit 10 is higher than the output voltage of the input energy storage unit 10. The power management unit 20 also outputs a receiving signal to the input energy storage unit 10, so that the input energy storage unit 10 receives the output voltage from the output energy storage unit 10. Other energy storage units 10 that have not received the voltage conversion signal and the receiving signal disconnect the electrical circuit between the wire and stop receiving the output voltage of the output energy storage unit 10; thereby, the output energy storage unit 10 can only charge the input energy storage unit 10. It is easy to understand that the input energy storage unit 10 may include multiple energy storage units 10.

[0065] Reference Figure 2 In one embodiment of the present invention, the power management unit 20 includes:

[0066] A voltage detection circuit 210, wherein the voltage detection circuit 210 is connected to each of the energy storage units 10 and is used to detect an output voltage of each of the energy storage units 10;

[0067] A main control circuit 220, wherein the main control circuit 220 is respectively connected to the output end of the voltage detection circuit 210 and the multiple energy storage units 10; the main control circuit 220 is used to determine the output energy storage unit 10 according to the output voltage, and output a corresponding voltage conversion signal to the output energy storage unit 10, so that the output energy storage unit 10 charges other energy storage units 10.

[0068] In this embodiment, the power management unit 20 includes a voltage detection circuit 210 and a main control circuit 220, wherein the voltage detection circuit 210 is used to detect the output voltage of each of the energy storage units 10, and output the output voltage of each of the energy storage units 10 to the main control circuit 220; the main control circuit 220 determines the output energy storage unit 10 according to the output voltage, and outputs a corresponding voltage conversion signal to the output energy storage unit 10. The voltage detection circuit 210 may include a resistor voltage divider circuit, a voltage follower, and an analog-to-digital converter, etc. The main control circuit 220 may include an MCU, a DSP, an FPGA, or a SOC, etc. Since the battery is a capacitive device, the output voltage of the capacitive device is positively correlated with the electrical energy stored therein. Therefore, the remaining power can be judged according to the output voltage; after receiving the output voltage of the energy storage unit 10, the main control circuit 220 can use the energy storage unit 10 with the highest output voltage as the output energy storage unit 10, and because the output voltage of the output energy storage unit 10 needs to be greater than the output voltages of other energy storage units 10 in order to charge the other energy storage units 10; therefore, the main control circuit 220 can output a corresponding voltage conversion signal to the output energy storage unit 10 according to the output voltage of each energy storage unit 10, so that the output voltage of the output energy storage unit 10 is higher than the output voltage of the other energy storage units 10, thereby being able to charge the other energy storage units 10.

[0069] In one embodiment of the present invention, the topological structure formed by the multiple energy storage units 10 and the conductive wires is a ring topological structure.

[0070] In this embodiment, the multiple energy storage units 10 form a ring topology structure, thereby avoiding the multiple energy storage units 10 being connected to each other in pairs using wires. The multiple energy storage units 10 forming a ring topology structure can realize connecting all energy storage units 10 through a wire. A switch can be provided in the electrical circuit between the energy storage unit 10 and the wire. After closing the electrical circuit between the output energy storage unit 10 and the wire, the output energy storage unit 10 outputs a voltage to the wire; after closing the electrical circuit between the input energy storage unit 10 and the wire, the input energy storage unit 10 receives the voltage output by the output energy storage unit 10. The other energy storage units 10 disconnect the electrical circuit between the wire. The formation of a ring topology between multiple energy storage units 10 can reduce the use of wires and save costs.

[0071] Reference Figure 3 In one embodiment of the present invention, the energy storage unit 10 includes:

[0072] Battery assembly 110;

[0073] A switch circuit 120, a first end of which is connected to the wires connecting the plurality of energy storage units 10, and a second end of which is connected to the battery assembly 110;

[0074] A voltage conversion circuit 130, an input end of which is connected to the battery, and an output end of which is connected to the third end of the switch circuit 120;

[0075] A control circuit 140, wherein a communication end of the control circuit 140 is connected to the power management unit 20, a second end is connected to the voltage conversion circuit 130, and a third end is connected to the switch circuit 120; the control circuit 140 is used to control the voltage conversion circuit 130 to output the battery output voltage converted into a corresponding voltage and then output it when receiving the voltage conversion signal, and to control the switch circuit 120 to turn on the electrical circuit between its first end and the third end, and to turn off the electrical circuit between its first end and the second end.

[0076] In this embodiment, the energy storage unit 10 includes a battery assembly 110, and the battery assembly 110 is used to store electrical energy. The first end of the switch circuit 120 is connected to the wire connecting the multiple energy storage units 10, the second end is connected to the battery assembly 110, and the third end is connected to the output end of the voltage conversion circuit 130. The input end of the voltage conversion circuit 130 is connected to the battery assembly 110. It is easy to understand that the energy storage unit 10 can be an output energy storage unit 10, an input energy storage unit 10, or neither an output energy storage unit 10 nor an input energy storage unit 10. The control circuit 140 is connected to the power management unit 20 for communication, and receives a voltage conversion signal or a reception signal from the power management unit 20. When the control circuit 140 receives the voltage conversion signal, the energy storage unit 10 is an output energy storage unit 10, and the control circuit 140 controls the switch circuit 120 to connect the path between the wire and the voltage conversion circuit 130 and to disconnect the electrical circuit between the wire and the battery assembly 110. The voltage conversion circuit 130 can convert the output voltage of the battery assembly 110 and output the corresponding voltage to the wire under the control of the control circuit 140. When the control circuit 140 receives the receiving signal, the energy storage unit 10 is an input energy storage unit 10, and the control circuit 140 controls the switch circuit 120 to connect the electrical circuit between the wire and the battery assembly 110 and to disconnect the electrical circuit between the wire and the voltage conversion circuit 130, and the battery assembly 110 receives the output voltage of the output energy storage unit 10 for charging. When the control circuit 140 does not receive a voltage conversion signal and a receiving signal, the energy storage unit 10 is neither an output energy storage unit 10 nor an input energy storage unit 10. The control circuit 140 can control the switch circuit 120 to disconnect the electrical circuit between the wire and the battery assembly 110. At the same time, the control circuit 140 controls the voltage conversion circuit 130 to stop working.

[0077] The voltage conversion circuit 130 may include: an LDO regulator, a Zener diode, a BUCK circuit or a switching regulator, etc. The control circuit 140 may include an MCU, a SOC or an FPGA, etc. The battery assembly 110 may include a lithium battery, a sodium battery, a lithium iron phosphate battery, etc. The switch circuit 120 may include an electric knife three-gate switch, a MOS tube or a triode, etc.

[0078] Reference Figure 4 In one embodiment of the present invention, the switch circuit 120 includes:

[0079] A first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a first transistor T1, a first PMOS transistor PQ1, a first NMOS transistor NQ1, and a second NMOS transistor NQ2;

[0080] The anode of the first diode D1 is connected to the third end of the control circuit 140, and the cathode is connected to the first end of the first resistor R1; the second end of the first resistor R1 is connected to the base of the first transistor T1 and the first end of the second resistor R2; the second end of the second resistor R2 is connected to the emitter of the first transistor T1 and grounded; the collector of the first transistor T1 is connected to the second end of the third resistor R3, the gate of the first PMOS tube PQ1, and the gate of the first NMOS tube NQ1; the first end of the third resistor R3 is connected to the first voltage; the drain of the first PMOS tube PQ1 is connected to the output end of the voltage conversion circuit 130, and the source is connected to the drain of the second NMOS tube NQ2; the drain of the first NMOS tube NQ1 is connected to the battery assembly 110, and the source is connected to the drain of the second NMOS tube NQ2; the source of the second NMOS tube NQ2 is connected to the wire connecting the multiple energy storage units 10, and the gate is connected to the fourth end of the control circuit 140.

[0081] In this embodiment, the first diode D1 is used to prevent current backflow and to prevent the first transistor T1 from being triggered by mistake due to the unstable voltage at the third terminal of the control circuit 140. The first resistor R1 is a current limiting resistor, and the first resistor R1 and the second resistor R2 form a resistor voltage divider circuit. The first transistor T1 is an NPN transistor, and the first transistor T1 is used to be turned on at a high level. The third resistor R3 is a current limiting resistor, and the first end of the third resistor R3 is connected to a first voltage, and the first voltage is a pull-up voltage. The first voltage can be provided by the power supply in the switch circuit 120, and can also be provided by the power supply in the energy storage unit 10. The first voltage is a high voltage compared to the first PMOS tube PQ1 and the first NMOS tube NQ1. The first voltage acts on the gate of the first PMOS transistor PQ1 and the gate of the first NMOS transistor NQ1 through the third resistor R3, so that the first PMOS transistor PQ1 is turned off and the first NMOS transistor NQ1 is turned on; that is, the electrical circuit between the voltage conversion circuit 130 and the second NMOS transistor NQ2 is turned on, and the electrical circuit between the battery assembly 110 and the second NMOS transistor NQ2 is turned off. The second NMOS transistor NQ2 is connected to the fourth terminal of the control circuit 140; after receiving the voltage conversion signal, the control circuit 140 outputs a high level through the fourth terminal, the gate of the second NMOS transistor NQ2 is a high level, and the second NMOS transistor NQ2 is turned on; and outputs a high level through the third terminal, so that the first triode T1 is turned on, the voltage at the gate of the first PMOS transistor PQ1 is a low voltage, and the first PMOS transistor PQ1 is turned on, so that the electrical circuit between the voltage conversion circuit 130 and the wire is turned on. The voltage at the gate of the first NMOS transistor NQ1 is at a low level, and the first NMOS transistor NQ1 is turned off, that is, the electrical circuit between the battery assembly 110 and the wire is turned off.

[0082] When the control circuit 140 receives the receiving signal, the control circuit 140 outputs a high level through the fourth terminal, the gate of the second NMOS tube NQ2 is a high level, and the second NMOS tube NQ2 is turned on. And the control circuit 140 outputs a low level through the third terminal, so that the first transistor T1 is turned off, the voltage at the gate of the first PMOS tube PQ1 is the first voltage, that is, a high level, and the first PMOS tube PQ1 is turned off, so that the electrical circuit between the voltage conversion circuit 130 and the wire is turned off. The voltage at the gate of the first NMOS tube NQ1 is a high level, and the first NMOS tube NQ1 is turned on, that is, the electrical circuit between the battery assembly 110 and the wire is turned on.

[0083] When the control circuit 140 receives neither the voltage conversion signal nor the receiving signal, the control circuit 140 outputs a low level through the fourth terminal, the gate of the second NMOS tube NQ2 is at a low level, and the second NMOS tube NQ2 is cut off, that is, the path between the wire and the battery assembly 110 or the voltage conversion circuit 130 is cut off.

[0084] Reference Figure 5 In one embodiment of the present invention, the energy storage unit 10 further includes:

[0085] A bidirectional inverter circuit 150, one end of which is connected to an external AC source, the other end of which is connected to the battery assembly 110, and a control end of which is connected to the control circuit 140;

[0086] The bidirectional inverter circuit 150 is used to rectify the AC power output by the external AC source into DC power to charge the battery assembly 110;

[0087] Or, the bidirectional inverter circuit 150 is used to invert the direct current output by the battery assembly 110 into alternating current and then output it to the external alternating current source;

[0088] The control circuit 140 is used to control the bidirectional inverter circuit 150 to work when triggered by the first mode, and rectify the AC power output by the external AC source into DC power to charge the battery assembly 110;

[0089] Alternatively, the control circuit 140 is further configured to, when triggered by the second mode, control the bidirectional inverter circuit 150 to invert the direct current output by the battery assembly 110 into alternating current and then output the alternating current to the external alternating current source.

[0090] In this embodiment, the external AC source includes a power grid or the new energy power generation device, etc. Among them, the power grid is an AC power grid, and the new energy power generation device may include a solar panel or a wind turbine. The new energy power generation device also includes an energy storage module for storing electrical energy and outputting it when needed. In addition, in order to adapt to common equipment on the market, the new energy power generation device outputs AC power. The three-phase inverter circuit is used to rectify the AC power output by the external AC source to charge the battery assembly 110, or to invert the DC power output by the battery assembly 110 into AC power and then output it to the external AC source; in particular, when the external AC source is a power grid, the energy storage unit 10 obtains energy from the power grid through a bidirectional inverter circuit 150 for charging to store electricity for emergency use. In addition, the energy storage unit 10 can also invert the DC power output by the battery assembly 110 into AC power through a bidirectional inverter circuit 150 after its battery assembly 110 is full of energy, and then output it to the power grid to improve energy utilization efficiency. The control circuit 140 may include a controller such as an MCU, and the user may send a first control instruction to the control circuit 140 through a computer and a data cable, so that when the control circuit 140 receives the first control instruction, it controls the bidirectional inverter circuit 150 to work, and rectifies the AC power output by the external AC source into DC power to charge the battery assembly 110. The user may also send a second control instruction to the control circuit 140, so that when the control circuit 140 receives the second control instruction, it inverts the DC power output by the battery assembly 110 into AC power and then outputs it to the external AC source. In one embodiment of the present invention, the energy storage unit 10 may include a touch screen, and the touch screen is connected to the control circuit 140. The user may send a first control instruction to the control circuit 140 by clicking a specific area of ​​the touch screen, so that it controls the bidirectional inverter circuit 150 to work, and rectifies the AC power output by the external AC source into DC power to charge the battery assembly 110. It is easy to understand that the touch screen can be divided into many blocks. When different blocks are clicked, the control circuit 140 receives different instructions. The user can send a second control instruction to the control circuit 140 by clicking the touch screen, so that the bidirectional inverter circuit 150 inverts the DC power output by the battery assembly 110 into AC power and then outputs it to the external AC source. The bidirectional inverter circuit 150 includes a rectifier circuit, a filter circuit, an inverter circuit, and the like.

[0091] In one embodiment of the present invention, the external AC source includes at least one of a power grid, a solar panel and a wind turbine.

[0092] The present invention also proposes a distributed energy storage device, which includes the above-mentioned household distributed energy storage system. The specific structure of the household distributed energy storage system refers to the above-mentioned embodiment. Since the distributed energy storage device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0093] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A household distributed energy storage system, characterized in that: The energy storage system comprises: Multiple energy storage units and power management units; The energy storage units are distributed in the house, and the multiple energy storage units are connected by wires; The power management unit is connected to the multiple energy storage units respectively; The power management unit is used to detect the remaining power of each of the energy storage units, and identify the energy storage unit with the largest remaining power as the output energy storage unit; The power management unit is further used to output a voltage conversion signal to the output energy storage unit; The output energy storage unit is used to output the corresponding voltage to other energy storage units according to the voltage conversion signal; The topological structure formed by the multiple energy storage units and the wires is a ring topological structure; The energy storage unit comprises: Battery components; A switch circuit, a first end of which is connected to the wires connecting the plurality of energy storage units, and a second end of which is connected to the battery assembly; A voltage conversion circuit, an input end of which is connected to the battery assembly, and an output end of which is connected to the third end of the switch circuit; A control circuit, wherein a communication end of the control circuit is connected to the power management unit, a second end is connected to the voltage conversion circuit, and a third end is connected to the switch circuit; when the control circuit receives the voltage conversion signal, the control circuit controls the voltage conversion circuit to convert the output voltage of the battery assembly into a corresponding voltage for output, and controls the switch circuit to conduct the electrical circuit between the first end and the third end, and to shut down the electrical circuit between the first end and the second end; The power management unit is communicatively connected with the multiple energy storage units, the multiple energy storage units respectively output remaining power information and demand information to the power management unit, and the power management unit is used to determine the output energy storage unit and the input energy storage unit according to the remaining power information and demand information output by the multiple energy storage units; The power management unit is used to output a voltage conversion signal to the output energy storage unit, and output a receiving signal to the input energy storage unit so that the output energy storage unit outputs a corresponding voltage to the input energy storage unit.

2. The household distributed energy storage system according to claim 1, characterized in that: The power management unit comprises: A voltage detection circuit, the voltage detection circuit is connected to each of the energy storage units and is used to detect the output voltage of each of the energy storage units; A main control circuit, wherein the main control circuit is respectively connected to the output end of the voltage detection circuit and the plurality of energy storage units; the main control circuit is used to determine the output energy storage unit according to the output voltage, and output a corresponding voltage conversion signal to the output energy storage unit, so that the output energy storage unit charges other energy storage units.

3. The household distributed energy storage system according to claim 1, characterized in that: The switch circuit comprises: A first resistor, a second resistor, a third resistor, a first diode, a first transistor, a first PMOS transistor, a first NMOS transistor, and a second NMOS transistor; The anode of the first diode is connected to the third end of the control circuit, and the cathode is connected to the first end of the first resistor; the second end of the first resistor is connected to the base of the first transistor and the first end of the second resistor; the second end of the second resistor is connected to the emitter of the first transistor and grounded; the collector of the first transistor is connected to the second end of the third resistor, the gate of the first PMOS tube, and the gate of the first NMOS tube; the first end of the third resistor is connected to a first voltage; the source of the first PMOS tube is connected to the output end of the voltage conversion circuit, and the drain is connected to the source of the second NMOS tube; the source of the first NMOS tube is connected to the battery assembly, and the drain is connected to the source of the second NMOS tube; the drain of the second NMOS tube is connected to the wire connecting multiple energy storage units, and the gate is connected to the fourth end of the control circuit.

4. The household distributed energy storage system according to claim 3, characterized in that: The energy storage unit also includes: A bidirectional inverter circuit, one end of which is connected to an external AC source, the other end of which is connected to the battery assembly, and a control end of which is connected to the control circuit; The bidirectional inverter circuit is used to rectify the AC power output by the external AC source into DC power for charging the battery assembly; or The bidirectional inverter circuit is used to invert the direct current output by the battery assembly into alternating current and then output it to the external alternating current source; The control circuit is used to control the bidirectional inverter circuit to operate when triggered by the first mode, and rectify the AC power output by the external AC source into DC power to charge the battery assembly; or The control circuit is also used to control the bidirectional inverter circuit to invert the direct current output by the battery assembly into alternating current and then output it to the external alternating current source when triggered by the second mode.

5. The household distributed energy storage system according to claim 4, characterized in that: The external AC source includes at least one of a power grid, a solar panel and a wind turbine.

6. A distributed energy storage device, characterized in that: The distributed energy storage device includes a household distributed energy storage system as described in any one of claims 1 to 5.

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