Intelligent household energy storage system and implementation method thereof

Abstract

An intelligent household energy storage system and an implementation method thereof. The intelligent household energy storage system comprises a photovoltaic panel (1), a lithium battery energy storage module (2), a micro inverter (3), a household load (4), and a power grid (5), wherein an input end of the lithium battery energy storage module (2) is connected to an output end of the photovoltaic panel (1); an output end of the lithium battery energy storage module (2) is connected to an input end of the micro inverter (3); output ends of the micro inverter (3) are respectively connected to an input end of the power grid (5) and an input end of the household load (4); energy generated by the photovoltaic panel (1) is controlled and adjusted by a power management communication unit (22) and a voltage control and adjustment unit (21), transmitted to the micro inverter (3), and then transmitted to the household load (4) or the power grid (5), so that various forms of household power utilization requirements such as solar power generation, lithium battery charging / discharging energy storage functions, and grid-connected and off-grid power consumption can be met.

Description

A smart home energy storage system and implementation method thereof Technical Field

[0001] The present invention belongs to the technical field of new energy photovoltaic power generation and energy storage, and specifically relates to an intelligent home energy storage system and an implementation method thereof. Background Art

[0002] Solar energy is a clean new energy source that can solve the energy crisis of mankind. It is inexhaustible and can be used everywhere. It can supply power nearby and does not require long-distance transmission. It can avoid the loss of long-distance transmission lines, does not produce any waste, is pollution-free and noise-free, and has no adverse effects on the environment. It is an ideal clean energy source. The solar photovoltaic power generation system is a power generation system that uses solar cells to directly convert solar energy into electrical energy. The photovoltaic power generation process does not require cooling water. A photovoltaic power generation system can generate electricity as long as it has solar cell modules. In addition, the widespread use of automatic control technology can basically achieve unmanned operation and low maintenance costs.

[0003] However, the current household distributed power generation system has high initial investment costs and cannot be used portablely after fixed installation, which limits the further development of home energy storage systems. Therefore, there is an urgent need for a home energy storage system with a simple structure, easy installation, low cost and portability to help people more conveniently utilize solar energy.

[0004] Summary of the Invention

[0005] The present invention aims to provide a smart home energy storage system to solve the problems mentioned in the background art. The smart home energy storage system provided by the present invention has the characteristics of simple structure, lightweight architecture, convenient installation of each module, and low cost of use.

[0006] Another object of the present invention is to provide a method for implementing a smart home energy storage system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a smart home energy storage system, comprising a photovoltaic panel, a lithium battery energy storage module, a micro-inverter, a household load, and a power grid, wherein the input end of the lithium battery energy storage module is connected to the output end of the photovoltaic panel, the output end of the lithium battery energy storage module is connected to the input end of the micro-inverter, and the output end of the micro-inverter is respectively connected to the input ends of the power grid and the household load;

[0008] The lithium battery energy storage module includes a voltage control and regulation unit, a power management and communication unit, and a lithium battery energy storage unit. The input end of the voltage control and regulation unit is connected to the output end of the photovoltaic panel, the output end of the voltage control and regulation unit is connected to the input end of the power management and communication unit, the output end of the power management and communication unit is connected to the micro inverter, and the power management and communication unit is also connected to the lithium battery energy storage unit.

[0009] In order to realize various functions such as charging and discharging, the power management communication unit further includes an MCU for data processing, a CHG MOS tube for controlling the charging on and off, a DSG MOS tube for controlling the discharge on and off, and a PV MOS tube for controlling the input of the voltage control and regulation unit.

[0010] In order to connect with the mobile terminal APP for remote monitoring and operation, so that the user can adjust the discharge mode by himself, the power management communication unit further includes a wireless communication module. The wireless communication module is an RS485 communication module.

[0011] In order to ensure that the input voltage is stable at a set value and avoid overcharging of the lithium battery, and to play a secondary protection role, the voltage control and regulation unit further includes an MPPT controller.

[0012] Furthermore, in the present invention, a method for implementing a smart home energy storage system includes the following steps:

[0013] (1) Only lithium battery energy storage module charging mode: When the power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel meet the charging power of the lithium battery energy storage unit, if the power management communication unit determines that the lithium battery energy storage unit is not fully charged at this time, and the household load or the power grid does not need to discharge, the CHG MOS tube in the power management communication unit is turned on, the DSG MOS tube and the PV MOS tube are turned off, and the DC power generated by the photovoltaic panel is increased or decreased to a charging voltage suitable for charging the lithium battery energy storage unit through the voltage control and regulation unit, and the lithium battery energy storage unit is charged through the power management and communication unit. When the power management and communication unit determines that the lithium battery energy storage unit is fully charged, the CHG MOS tube is turned off, and the voltage control and regulation unit is cut off from charging the lithium battery energy storage unit;

[0014] (2) Discharge mode of the lithium battery energy storage module only: When the power management communication unit determines that the light intensity cannot make the discharge power of the photovoltaic panel meet the charging of the lithium battery energy storage unit, if the power management communication unit determines that the lithium battery energy storage unit has power to discharge, the voltage control and regulation unit does not work. At this time, the DSG MOS tube in the power management communication unit is turned on, the CHG MOS tube and the PV MOS tube are turned off, and the lithium battery energy storage unit directly transmits the DC power to the micro inverter through the power management communication unit, and then to the household load or the grid for power supply. If the power management communication unit determines that the power of the lithium battery energy storage unit is insufficient to discharge, the DSG MOS tube is turned off, and the discharge process is disconnected;

[0015] (3) A mode in which the photovoltaic panel charges the lithium battery energy storage module and discharges the photovoltaic panel to the household load or the power grid at the same time: when the power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel meet the power consumption of the household load, if the power management communication unit determines that the lithium battery energy storage unit is not fully charged at this time, the DSG MOS tube in the power management communication unit is turned off, and the CHG MOS tube and the PV MOS tube are turned on. The DC power generated by the photovoltaic panel is raised or lowered to a charging voltage suitable for charging the lithium battery energy storage unit through the voltage control and regulation unit. After passing through the power management and communication unit, the lithium battery energy storage unit is charged on one side and the micro inverter is supplied to the household load or the power grid on the other side. When the power management and communication unit determines that the lithium battery energy storage unit is fully charged, the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit and transmits the power generated by the photovoltaic panel to the micro inverter, and finally to the household load or the power grid;

[0016] (IV) Simultaneous discharge mode of the lithium battery energy storage module and the photovoltaic panel: When the optical power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel alone unable to meet the power consumption of the household load, and at this time the power management communication unit determines that the lithium battery energy storage unit has power to discharge, the DSG MOS tube and PV MOS tube in the power management communication unit are turned on, and the CHG MOS tube is turned off, and the photovoltaic panel and the lithium battery energy storage module supply power to the household load at the same time. When the power management communication unit determines that the lithium battery energy storage unit has insufficient power and cannot continue to discharge, the power management communication unit will cut off the discharge of the lithium battery energy storage unit, and the power grid will continue to supply power to the household load.

[0017] Furthermore, in the present invention, the power management communication unit controls the opening and closing of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU.

[0018] Furthermore, in the present invention, the power management communication unit controls the discharge mode by detecting voltage parameters.

[0019] Furthermore, in the present invention, the discharge mode includes discharging of the lithium battery energy storage module only, charging of the lithium battery energy storage module by the photovoltaic panel, discharging of the photovoltaic panel to the household load or the power grid, and discharging of the lithium battery energy storage module and the photovoltaic panel simultaneously.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention transmits the energy generated by the photovoltaic panels to the micro-inverter after being controlled and regulated by the power management communication unit and the voltage control and regulation unit, and then transmits it to the household load or the power grid. It can meet various household electricity needs such as solar power generation, lithium battery charging and discharging energy storage functions, and off-grid electricity use;

[0022] 2. The direct current generated by the photovoltaic panel of the present invention is directly stored in the lithium battery energy storage module, which has higher energy conversion efficiency than storing it in the lithium battery after passing through the inverter;

[0023] 3. The lithium battery energy storage module of the present invention can prevent the battery from overcharging or over-discharging by detecting the voltage of the lithium battery energy storage unit, thereby playing a safety protection role;

[0024] 4. The voltage control and regulation unit of the present invention can step up or down the voltage of the DC power generated by the photovoltaic panel to reach a charging voltage suitable for the lithium battery energy storage module, thereby charging the lithium battery energy storage module and adapting to lithium battery energy storage modules with different voltage platforms;

[0025] 5. The power management communication unit of the present invention controls the opening and closing of the CHG MOS tube, DSG MOS tube and PV MOS tube through the MCU to realize various functions such as charging and discharging;

[0026] 6. The power management communication unit of the present invention collects the voltage of each battery string in the lithium battery energy storage unit through the MCU, determines whether it is fully charged or discharged, and controls the opening and closing of the CHG MOS tube and the DSG MOS tube to cut off the charging or discharging process, thereby preventing overcharging and over-discharging and playing a protective role;

[0027] 7. The power management communication unit of the present invention can collect current through the MCU, determine whether it is overcurrent or short circuit, and open and close the circuit through the MOS tube to play the role of short circuit protection and overcurrent protection;

[0028] 8. The power management communication unit of the present invention can be connected to a mobile terminal APP for remote monitoring and operation, allowing users to adjust the discharge mode by themselves;

[0029] 9. The voltage control and regulation unit of the present invention includes an MPPT controller, which can perform an input voltage limiting function. That is, after the maximum power point voltage of the solar energy is set, as long as the voltage is lower than this value, the module will reduce the output current and output power to ensure that the input voltage is stable at the set value. At the same time, the voltage control and regulation unit also has a charging protection function. When the lithium battery energy storage module is fully charged, it will cut off its charging, avoiding overcharging of the lithium battery and playing a secondary protection role.

[0030] 10. The present invention can realize intelligent switching between photovoltaic panel power supply and lithium battery energy storage module power supply, thereby meeting the use of power loads under different lighting conditions and battery capacity conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a system block diagram of the present invention;

[0032] FIG2 is an electrical schematic diagram of a lithium battery energy storage module of the present invention;

[0033] FIG3 is a schematic diagram of a charging mode of only a lithium battery energy storage module according to the present invention;

[0034] FIG4 is a schematic diagram of a discharge mode of only the lithium battery energy storage module of the present invention;

[0035] FIG5 is a schematic diagram of a mode in which the photovoltaic panel of the present invention is simultaneously charged to the lithium battery energy storage module and discharged to the household load or the power grid;

[0036] FIG6 is a schematic diagram of a lithium battery energy storage module and a photovoltaic panel in a simultaneous discharge mode according to the present invention;

[0037] FIG7 is an electrical schematic diagram of a voltage control and regulation unit according to the present invention;

[0038] FIG8 is an electrical schematic diagram of the voltage control and regulation unit in boost mode according to the present invention;

[0039] FIG9 is an electrical schematic diagram of the voltage control and regulation unit in buck mode according to the present invention;

[0040] FIG10 is an electrical schematic diagram of the voltage control and regulation unit MPPT input voltage regulation of the present invention;

[0041] In the figure: 1. Photovoltaic panel; 2. Lithium battery energy storage module; 21. Voltage control and regulation unit; 22. Power management communication unit; 23. Lithium battery energy storage unit; 3. Micro inverter; 4. Household load; 5. Power grid. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0043] Example 1

[0044] 1-10 , the present invention provides the following technical solution: a smart home energy storage system, comprising a photovoltaic panel 1, a lithium battery energy storage module 2, a micro-inverter 3, a household load 4, and a power grid 5, wherein the input end of the lithium battery energy storage module 2 is connected to the output end of the photovoltaic panel 1, the output end of the lithium battery energy storage module 2 is connected to the input end of the micro-inverter 3, and the output end of the micro-inverter 3 is connected to the input ends of the power grid 5 and the household load 4, respectively;

[0045] The lithium battery energy storage module 2 includes a voltage control and adjustment unit 21, a power management and communication unit 22, and a lithium battery energy storage unit 23, wherein the input end of the voltage control and adjustment unit 21 is connected to the output end of the photovoltaic panel 1, the output end of the voltage control and adjustment unit 21 is connected to the input end of the power management and communication unit 22, the output end of the power management and communication unit 22 is connected to the micro inverter 3, and the power management and communication unit 22 is also connected to the lithium battery energy storage unit 23.

[0046] By adopting the above technical solution, the present invention transmits the energy generated by the photovoltaic panel 1 to the micro-inverter 3 after being controlled and regulated by the power management communication unit 22 and the voltage control and regulation unit 21, and then transmits it to the household load 4 or the power grid 5. This can meet various household electricity needs such as solar power generation, lithium battery charging and discharging energy storage functions, and off-grid electricity use. The direct current generated by the photovoltaic panel 1 of the present invention is directly stored in the lithium battery energy storage module 2, which has higher energy conversion efficiency than storing it in the lithium battery after passing through the inverter.

[0047] The lithium battery energy storage module 2 of the present invention can prevent the battery from being overcharged or over-discharged by detecting the voltage of the lithium battery energy storage unit, thereby playing a safety protection role;

[0048] The voltage control and regulation unit 21 of the present invention can step up or down the voltage of the direct current generated by the photovoltaic panel 1 to reach a charging voltage suitable for the lithium battery energy storage module 2, thereby charging the lithium battery energy storage module 2, thereby achieving adaptation to lithium battery energy storage modules of different voltage platforms.

[0049] Specifically, the power management communication unit 22 includes an MCU for data processing, a CHG MOS transistor for controlling charging on and off, a DSG MOS transistor for controlling discharging on and off, and a PV MOS transistor for controlling the input of the voltage control and regulation unit 21 .

[0050] By adopting the above technical solution, the power management communication unit 22 of the present invention controls the opening and closing of the CHG MOS tube, DSG MOS tube and PV MOS tube through the MCU to realize various functions such as charging and discharging;

[0051] The power management communication unit 22 of the present invention collects the voltage of each battery string in the lithium battery energy storage unit 23 through the MCU, determines whether it is fully charged or discharged, and controls the CHG MOS tube and DSG MOS tube to open and close the charging or discharging process to prevent overcharging and over-discharging, thereby playing a protective role;

[0052] The power management communication unit 22 of the present invention can collect the current through the MCU, determine whether it is overcurrent or short circuit, and open and close the circuit through the MOS tube to play the role of short circuit protection and overcurrent protection.

[0053] Example 2

[0054] The difference between this embodiment and Embodiment 1 is as follows: Specifically, the power management communication unit 22 further includes a wireless communication module. The wireless communication module is an RS485 communication module.

[0055] By adopting the above technical solution, the power management communication unit 22 of the present invention can be connected to the mobile terminal APP for remote monitoring and operation, enabling users to adjust the discharge mode by themselves.

[0056] Embodiment 3

[0057] The difference between this embodiment and Embodiment 1 is as follows: Specifically, the voltage control and regulation unit 21 includes an MPPT controller.

[0058] By adopting the above technical solution, the present invention can perform an input voltage limiting function. That is, after setting the solar maximum power point voltage, as long as the voltage is lower than this value, the module will reduce the output current and output power to ensure that the input voltage is stable at the set value. At the same time, the voltage control and regulation unit 21 also has a charging protection function. After the lithium battery energy storage module 2 is fully charged, the charging will be cut off to avoid overcharging of the lithium battery and play a secondary protection role.

[0059] Embodiment 4

[0060] The difference between this embodiment and Embodiment 1 is as follows: Specifically, as shown in Figure 7. The voltage control and regulation unit can achieve buck-boost and MPPT functions through a voltage management chip with peripheral circuits and a control MOS tube. In this embodiment, the model of the voltage management chip is preferably LT8210.

[0061] As shown in the boost BOOST mode of Figure 8.

[0062] The voltage management chip judges that when VIN < VOUT through the VC1 and FB pins, the boost mode is enabled: A = ON, B = OFF, C = PWM, D = / PWM, which is equivalent to the ordinary boost circuit in Figure 8. By adjusting the duty cycle of different PWM signals, a stable VOUT output is achieved.

[0063] As shown in the buck BUCK mode of Figure 9.

[0064] The voltage management chip judges that when VIN > VOUT through the VC1 and FB pins, the buck mode is enabled: A = PWM, B = / PWM, D = ON, C = OFF, which is equivalent to the ordinary buck circuit in Figure 9. By adjusting the duty cycle of different PWM signals, a stable VOUT output is achieved.

[0065] As shown in the MPPT input voltage regulation of Figure 10.

[0066] CV_5V is the reference power supply. The VIN input voltage is divided and compared with the reference voltage to control the output current of the voltage management chip, stabilizing the MPPT voltage operating point. For example, when the PV light intensity increases, the VIN voltage rises, and the U5 output voltage (PIN4) increases. This voltage increase is fed back to the voltage management chip, which adjusts the PWM duty cycle to increase the output current (and thus the output power). This increased output current stabilizes the PV input voltage VIN at the set voltage point. VR1 can also adjust the MPPT operating voltage point.

[0067] Example 5

[0068] Furthermore, the method for implementing the smart home energy storage system described in the present invention includes the following steps:

[0069] (1) Charging mode of the lithium battery energy storage module 2 only: When the power management communication unit 22 determines that the light intensity makes the discharge power of the photovoltaic panel 1 meet the charging power of the lithium battery energy storage unit 23, if the power management communication unit 22 determines that the lithium battery energy storage unit 23 is not fully charged at this time, and the household load 4 or the power grid 5 does not need to be discharged, the CHG MOS tube in the power management communication unit 22 is turned on, the DSG MOS tube and the PV MOS tube are turned off, and the DC power generated by the photovoltaic panel 1 is increased or decreased to a charging voltage suitable for charging the lithium battery energy storage unit 23 through the voltage control and regulation unit 21, and the lithium battery energy storage unit 23 is charged through the power management and communication unit 22. When the power management and communication unit 22 determines that the lithium battery energy storage unit 23 is fully charged, the CHG MOS tube is turned off, and the voltage control and regulation unit 21 is cut off from charging the lithium battery energy storage unit 23;

[0070] (2) Discharge mode of the lithium battery energy storage module 2 only: When the power management communication unit 22 determines that the light intensity cannot make the discharge power of the photovoltaic panel 1 meet the charging of the lithium battery energy storage unit 23, if the power management communication unit 22 determines that the lithium battery energy storage unit 23 has power to discharge, the voltage control and regulation unit 21 does not work. At this time, the DSG MOS tube in the power management communication unit 22 is turned on, the CHG MOS tube and the PV MOS tube are turned off, and the lithium battery energy storage unit 23 directly transmits the DC power to the micro inverter 3 through the power management communication unit 22, and then supplies power to the household load 4 or the power grid 5. If the power management communication unit 22 determines that the power of the lithium battery energy storage unit 23 is insufficient to discharge, the DSG MOS tube is turned off, and the discharge process is disconnected;

[0071] (3) The photovoltaic panel 1 charges the lithium battery energy storage module 2 and discharges the photovoltaic panel 1 to the household load 4 or the grid 5 at the same time: when the power management communication unit 22 determines that the light intensity makes the discharge power of the photovoltaic panel 1 meet the power consumption of the household load, if the power management communication unit 22 determines that the lithium battery energy storage unit 23 is not fully charged at this time, the DSG MOS tube in the power management communication unit 22 is turned off, the CHG MOS tube and the PV MOS tube are turned on, and the DC power generated by the photovoltaic panel 1 is increased or decreased to a charging voltage suitable for charging the lithium battery energy storage unit 23 through the voltage control and regulation unit 21. After passing through the power management and communication unit 22, the lithium battery energy storage unit 23 is charged on one side and the micro inverter 3 is supplied to the household load 4 or the grid 5 on the other side. When the power management and communication unit 22 determines that the lithium battery energy storage unit 23 is fully charged, the voltage control and regulation unit 21 cuts off the charging of the lithium battery energy storage unit 23 and transmits the power generated by the photovoltaic panel 1 to the micro inverter 3, and finally to the household load 4 or the grid 5;

[0072] (IV) Simultaneous discharge mode of the lithium battery energy storage module 2 and the photovoltaic panel 1: When the light power management communication unit 22 determines that the light intensity makes the discharge power of the photovoltaic panel 1 alone unable to meet the power consumption of the household load, and at this time the power management communication unit 22 determines that the lithium battery energy storage unit 23 has power to discharge, the DSG MOS tube and PV MOS tube in the power management communication unit 22 are turned on, and the CHG MOS tube is turned off, and the photovoltaic panel 1 and the lithium battery energy storage module 2 simultaneously supply power to the household load 4. When the power management communication unit 22 determines that the lithium battery energy storage unit 23 has insufficient power and cannot continue to discharge, the power management communication unit 22 will cut off the discharge of the lithium battery energy storage unit 23, and at the same time the power grid 5 will continue to supply power to the household load 4.

[0073] Specifically, the power management communication unit 22 controls the opening and closing of the CHG MOS tube, the DSG MOS tube, and the PV MOS tube through the MCU.

[0074] By adopting the above technical solution, various functions such as charging and discharging can be realized.

[0075] Specifically, the power management communication unit 22 controls the discharge mode by detecting voltage parameters. Discharge modes include discharging only the lithium battery energy storage module 2, charging the lithium battery energy storage module 2 with the photovoltaic panel 1, discharging the photovoltaic panel 1 to the household load 4 or the power grid 5, and discharging both the lithium battery energy storage module 2 and the photovoltaic panel 1 simultaneously.

[0076] By adopting the above technical solution, intelligent switching between power supply of photovoltaic panel 1 and power supply of lithium battery energy storage module 2 can be realized, thereby meeting the use of power load under different lighting conditions and battery capacity conditions.

[0077] In summary, the present invention transmits the energy generated by the photovoltaic panel 1 to the micro inverter 3 after being controlled and regulated by the power management communication unit 22 and the voltage control and regulation unit 21, and then transmits it to the household load 4 or the power grid 5, which can meet various forms of household electricity needs such as solar power generation, lithium battery charging and discharging energy storage functions, and off-grid electricity use; the direct current generated by the photovoltaic panel 1 of the present invention is directly stored in the lithium battery energy storage module 2, which has higher energy conversion efficiency than the energy stored in the lithium battery after passing through the inverter; the lithium battery energy storage module 2 of the present invention can prevent the battery from overcharging or over-discharging by detecting the voltage of the lithium battery energy storage unit, thereby playing a safety protection role; the voltage control and regulation unit 21 of the present invention can step up and down the voltage of the direct current generated by the photovoltaic panel 1 to achieve a charging voltage suitable for the lithium battery energy storage module 2, thereby charging the lithium battery energy storage module 2, thereby realizing adaptation to lithium battery energy storage modules with different voltage platforms; the power management communication unit 22 of the present invention controls the CHG MOS tube, DSG MOS tube and PV through the MCU The power management communication unit 22 of the present invention collects the voltage of each battery in the lithium battery energy storage unit 23 through the MCU, determines whether it is full or empty, and controls the CHG MOS tube and DSG The MOS tube opens and closes the charging or discharging process to prevent overcharging and over-discharging, thus playing a protective role; the power management communication unit 22 of the present invention can collect the current size through the MCU, determine whether there is overcurrent or short circuit, and open and close the circuit through the MOS tube to play the role of short circuit protection and overcurrent protection; the power management communication unit 22 of the present invention can be connected to the mobile terminal APP for remote monitoring and operation, so that the user can adjust the discharge mode by himself; the voltage control and adjustment unit 21 of the present invention includes an MPPT controller, which can perform an input voltage limiting function, that is, after setting the maximum power point voltage of the solar energy, as long as the voltage is lower than this value, the module will reduce the output current and reduce the output power to ensure that the input voltage is stable at the set value. At the same time, the voltage control and adjustment unit 21 also has a charging protection function. After the lithium battery energy storage module 2 is fully charged, its charging will be cut off, avoiding overcharging of the lithium battery and playing a secondary protection role; the present invention can realize the intelligent switching of power supply of the photovoltaic panel 1 and the lithium battery energy storage module 2, thereby achieving the use of the power load under different lighting conditions and battery capacity conditions.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A smart home energy storage system, characterized in that: It includes a photovoltaic panel, a lithium battery energy storage module, a micro inverter, a household load and a power grid, wherein the input end of the lithium battery energy storage module is connected to the output end of the photovoltaic panel, the output end of the lithium battery energy storage module is connected to the input end of the micro inverter, and the output end of the micro inverter is respectively connected to the input end of the power grid and the household load; The lithium battery energy storage module includes a voltage control and regulation unit, a power management communication unit and a lithium battery energy storage unit, wherein the input end of the voltage control and regulation unit is connected to the output end of the photovoltaic panel, the output end of the voltage control and regulation unit is connected to the input end of the power management communication unit, the output end of the power management communication unit is connected to the micro inverter, and the power management communication unit is also connected to the lithium battery energy storage unit.

2. A smart home energy storage system according to claim 1, characterized in that: The power management communication unit includes an MCU for data processing, a CHG MOS tube for controlling charging on and off, a DSG MOS tube for controlling discharging on and off, and a PV MOS tube for controlling the input of the voltage control and regulation unit.

3. A smart home energy storage system according to claim 2, characterized in that: The power management communication unit also includes a wireless communication module.

4. A smart home energy storage system according to claim 3, characterized in that: The wireless communication module is an RS485 communication module.

5. The smart home energy storage system according to claim 1, characterized in that: The voltage control and regulation unit includes an MPPT controller.

6. A method for implementing a smart home energy storage system according to any one of claims 1 to 5, characterized in that: The following steps are involved: (I) Only the lithium battery energy storage module charging mode: When the power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel meet the charging of the lithium battery energy storage unit, if the power management communication unit determines that the lithium battery energy storage unit is not fully charged at this time, and the household load or the power grid does not need to discharge, the CHG MOS tube in the power management communication unit is turned on, the DSG MOS tube and the PV MOS tube are turned off, and the DC power generated by the photovoltaic panel is passed The voltage control and regulation unit increases or decreases the voltage to a charging voltage suitable for charging the lithium battery energy storage unit, and charges the lithium battery energy storage unit through the power management and communication unit. When the power management and communication unit determines that the lithium battery energy storage unit is full, the CHG MOS tube is turned off, and the voltage control and regulation unit is cut off from charging the lithium battery energy storage unit. (ii) Discharge mode of lithium battery energy storage module only: when the power management communication unit determines that the light intensity cannot make the discharge power of the photovoltaic panel meet the charging of the lithium battery energy storage unit, if the power management communication unit determines that the lithium battery energy storage unit has power to discharge, the voltage control and regulation unit does not work. At this time, the DSG MOS tube in the power management communication unit is turned on, and the CHG MOS tube and the PV MOS tube are turned off. The lithium battery energy storage unit directly transmits the DC power to the micro inverter through the power management communication unit, and then to the household load or the power grid. If the power management communication unit determines that the power of the lithium battery energy storage unit is insufficient to discharge, the DSG MOS tube is turned off and the discharge process is disconnected; (III) The photovoltaic panel charges the lithium battery energy storage module and discharges the photovoltaic panel to the household load or the power grid at the same time: when the power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel meet the power consumption of the household load, if the power management communication unit determines that the lithium battery energy storage unit is not fully charged at this time, the DSG MOS tube in the power management communication unit is turned off, and the CHG MOS tube and the PV MOS tube are turned on. The DC power generated by the photovoltaic panel is raised or lowered to a charging voltage suitable for charging the lithium battery energy storage unit through the voltage control and regulation unit. After passing through the power management and communication unit, the lithium battery energy storage unit is charged on one side and the micro inverter is supplied to the household load or the power grid on the other side. When the power management and communication unit determines that the lithium battery energy storage unit is full, the voltage control and regulation unit cuts off the charging of the lithium battery energy storage unit and transmits the electricity generated by the photovoltaic panel to the micro inverter, and finally to the household load or the power grid; (IV) Simultaneous discharge mode of lithium battery energy storage module and photovoltaic panel: When the light power management communication unit determines that the light intensity makes the discharge power of the photovoltaic panel alone unable to meet the power consumption of the household load, and the power management communication unit determines that the lithium battery energy storage unit has power to discharge, the power management communication unit The DSG MOS tube and PV MOS tube in the power supply module are turned on, and the CHG MOS tube is turned off. The photovoltaic panel and the lithium battery energy storage module supply power to the household load at the same time. When the power management communication unit determines that the lithium battery energy storage unit is insufficient and cannot continue to discharge, the power management communication unit will cut off the discharge of the lithium battery energy storage unit, and the power grid will continue to supply power to the household load.

7. The method for implementing a smart home energy storage system according to claim 6, characterized in that: The power management communication unit controls the opening and closing of the CHG MOS tube, the DSG MOS tube and the PV MOS tube through the MCU.

8. The method for implementing a smart home energy storage system according to claim 6, characterized in that: The power management communication unit controls the discharge mode by detecting voltage parameters.

9. The method for implementing a smart home energy storage system according to claim 8, characterized in that: The discharge modes include discharging of the lithium battery energy storage module only, charging of the lithium battery energy storage module by the photovoltaic panel, discharging of the photovoltaic panel to the household load or the power grid, and discharging of the lithium battery energy storage module and the photovoltaic panel simultaneously.

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