Household energy storage system

Abstract

The invention discloses a household energy storage system, and the system comprises an energy storage module which is used for storing electric energy or outputting the electric energy to the outside; the grid-connected circuit comprises a first switch; the first end of the first switch is connected with commercial power, and the second end of the first switch is connected with an electricity load; the energy storage module is electrically connected with the second end of the first switch; the current detection module is used for detecting current flowing through the first switch; the voltage detection module is used for detecting the voltage of the first end of the first switch; and the control module is electrically connected with the voltage detection module and the current detection module, and the control module is configured to control the conduction state of the first switch according to the voltage detection result of the voltage detection module and control the output of the energy storage module according to the current detection result of the current detection module. Therefore, the problem of insufficient mains supply power can be solved, installation is simple, and the improvement cost is low.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and more particularly to a home energy storage system. Background Technology

[0002] With the development of science and technology, there are more and more types of household appliances and household electrical equipment. The power demand of household electrical loads is also increasing, resulting in insufficient power of the mains power grid. If it is necessary to increase the power supply of the mains power grid, circuit modification is required, which is very time-consuming and labor-intensive. Summary of the Invention

[0003] This invention provides a home energy storage system to solve the problem of insufficient mains power supply. It is simple to install and has low retrofit costs.

[0004] According to one aspect of the present invention, a home energy storage system is provided, comprising: Energy storage module, which is used to store electrical energy or output electrical energy to the outside; A grid-connected circuit, comprising a first switch; a first terminal of the first switch is used to connect to mains power, and a second terminal of the first switch is used to connect to an electrical load; the energy storage module is electrically connected to the second terminal of the first switch. A current detection module is used to detect the current flowing through the first switch; A voltage detection module, wherein the voltage detection module is used to detect the voltage at the first terminal of the first switch; A control module is electrically connected to the voltage detection module and the current detection module. The control module is configured to control the conduction state of the first switch according to the voltage detection result of the voltage detection module, and to control the output of the energy storage module according to the current detection result of the current detection module.

[0005] Optional, also includes: A power distribution circuit, the power distribution circuit including circuit breakers and power distribution branches; The first end of the circuit breaker is connected to the second end of the first switch, the second end of the circuit breaker is connected to the first end of the power distribution branch, and the second end of the power distribution branch is used to connect the electrical load.

[0006] Optionally, the control module is configured to control the first switch to be turned on when the voltage at the first terminal of the first switch is greater than zero, and to control the first switch to be turned off when the voltage at the first terminal of the first switch is zero.

[0007] Optionally, the energy storage module includes an energy storage unit and an AC / DC bidirectional conversion unit; the energy storage unit includes a battery pack and a battery management circuit. The battery pack is electrically connected to the second terminal of the first switch via the AC / DC bidirectional conversion unit; The battery management circuit is configured to collect the power information of the battery pack and transmit the power information of the battery pack to the control module; The control module is configured to receive the battery pack's power information when the voltage at the first terminal of the first switch is greater than zero, control the AC / DC bidirectional conversion unit to be in rectification mode when the battery pack's power is less than or equal to a charging power threshold, and control the AC / DC bidirectional conversion unit to be in inverter mode when the battery pack's power is greater than a discharging power threshold.

[0008] Optionally, the control module is configured to control the AC / DC bidirectional conversion unit to be in inverter mode when the voltage at the first terminal of the first switch is zero.

[0009] Optionally, the current detection module is used to detect the current direction at the first terminal of the first switch; The current detection module is configured to output a positive current detection result when the current of the first switch flows from the first terminal to the second terminal of the first switch, and to output a negative current detection result when the current of the first switch flows from the second terminal to the first terminal of the first switch. The control module is configured to control the energy storage module to reduce its output power when the voltage at the first terminal of the first switch is greater than zero and the current of the first switch is negative, until the current of the first switch is no longer negative.

[0010] Optionally, the control module is configured to control the energy storage module to increase its output power when the voltage at the first terminal of the first switch is greater than zero and during the first power consumption period, until the maximum output power is reached or the current of the first switch is no longer positive.

[0011] Optionally, the current detection module is used to detect the current direction at the first terminal of the first switch; The current detection module is configured to output a positive current detection result when the current of the first switch flows from the first terminal to the second terminal of the first switch, and to output a negative current detection result when the current of the first switch flows from the second terminal to the first terminal of the first switch. The home energy storage system also includes an electricity meter; the energy storage module is connected to the second terminal of the first switch at a grid connection node; the electricity meter is electrically connected between the grid connection node and the mains power supply. The control module is configured to control the energy storage module to increase its output power until it reaches the maximum output power when the voltage at the first terminal of the first switch is greater than zero and during the first power consumption period. The control module is also configured to control the meter to measure the amount of electricity flowing from the energy storage module to the mains power when the current of the first switch is negative.

[0012] Optionally, the control module is configured to control the energy storage module to be in charging mode when the voltage at the first terminal of the first switch is greater than zero and it is during the second power consumption period.

[0013] Optionally, it may also include: a second switch; The first terminal of the second switch is electrically connected to the second terminal of the first switch, the second terminal of the second switch is electrically connected to the energy storage module, and the control terminal of the second switch is electrically connected to the control module.

[0014] Optionally, both the first switch and the second switch are normally open relays.

[0015] The technical solution of this invention connects a home energy storage system to the mains power access point, enabling the expansion and upgrading of the power supply network. Using both mains power and the energy storage module to supply power to the electrical load solves the problem of insufficient mains power supply. Installation is simple and the modification cost is low. By setting a voltage detection module, the conduction state of the first switch can be controlled in a timely manner when the mains power fails, preventing backflow of energy from the energy storage module to the mains power. By setting a current detection module, the output of the energy storage module can be adjusted in a timely manner when backflow occurs, improving the energy utilization rate of the energy storage module and preventing backflow of energy from the energy storage module to the mains power when both the energy storage module and the mains power are supplied simultaneously. Furthermore, by setting the current and voltage detection modules to only collect the current and voltage of the first switch, and having the control module directly control the output power of the first switch and the energy storage module in the grid-connected circuit, signal delay can be reduced, response speed can be improved, and it is beneficial to react promptly when the mains power fails or when power in the energy storage device flows back to the mains power, improving response speed and control accuracy.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a home energy storage system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another home energy storage system provided in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other without contradiction.

[0023] Figure 1 This is a schematic diagram of a home energy storage system provided in an embodiment of the present invention, for reference. Figure 1 Home energy storage systems include: Energy storage module 110, which is used to store electrical energy or output electrical energy to the outside; Grid-connected circuit 120 includes a first switch K1; a first end of the first switch K1 is used to connect to the mains power, and a second end of the first switch K1 is used to connect to the electrical load; the energy storage module 110 is electrically connected to the second end of the first switch K1. The current detection module 130 is used to detect the current flowing through the first switch K1; Voltage detection module 140, the voltage detection module 140 is used to detect the voltage at the first terminal of the first switch K1; The control module 150 is electrically connected to the voltage detection module 140 and the current detection module 130. The control module 150 is configured to control the conduction state of the first switch K1 according to the voltage detection result of the voltage detection module 140, and to control the output of the energy storage module 110 according to the current detection result of the current detection module 130.

[0024] The energy storage module 110 can be electrically connected to the mains power supply through the grid-connected circuit 120 to store electrical energy from the mains power supply. The energy storage module 110 can also be electrically connected to the electrical load through the grid-connected circuit 120 to output electrical energy to the electrical load. Under the control of the control module 150, the grid-connected circuit 120 can selectively conduct the transmission path between the energy storage module 110 and the mains power supply, as well as the transmission path between the mains power supply and the electrical load. The first switch K1 of the grid-connected circuit 120 includes, but is not limited to, controllable switching devices such as relays with controllable coils, metal-oxide-semiconductor field-effect transistors (MOSFETs), and insulated-gate bipolar transistors (IGBTs).

[0025] The sampling point of the current detection module 130 can be set at the first end of the first switch K1 and / or the second end of the first switch K1 to detect the current flowing through the first switch K1. In one embodiment, the current detection module 130 can detect the direction and value of the current flowing through the first switch K1. The voltage detection module 140 can detect the voltage at the first end of the first switch K1, that is, it can detect the voltage of the mains power connected to the first switch K1.

[0026] The control module 150 can acquire the current detection results from the current detection module 130 and the voltage detection results from the voltage detection module 140, and directly control the conduction state of the first switch K1 in the grid-connected circuit 120 based on the current detection results and voltage detection results, thereby controlling the transmission path between the energy storage module 110 and the mains power and the transmission path between the mains power and the first load in the grid-connected circuit 120. In one embodiment, the control module 150 is also electrically connected to the energy storage module 110 to control the operating state of the energy storage module 110.

[0027] Specifically, the grid-connected circuit 120 in the home energy storage system can connect the energy storage module 110 to the electrical load, enabling the energy storage module 110 and the mains power to simultaneously supply power to the electrical load to meet the load's power demand. The control module 150 can determine whether the mains power is interrupted based on the voltage detection result of the voltage detection module 140, and control the transmission path between the energy storage module 110 and the mains power, as well as the transmission path between the mains power and the electrical load, by controlling the conduction state of the first switch K1. The control module 150 can also determine whether the energy of the energy storage module 110 is flowing back to the mains power based on the current detection result of the current detection module 130. By controlling the output of the energy storage module 110, the situation of the energy of the energy storage module 110 flowing back to the mains power can be reduced. For example, the control module can adjust the output power of the energy storage module 110 according to the current flowing through the first switch K1 to avoid the energy of the energy storage module 110 flowing back to the mains power.

[0028] For example, the current detection module 130, voltage detection module 140, and control module 150 in a home energy storage system can be housed on the same circuit board, such as integrated into a control circuit board 001; the energy storage module 110, current detection module 130, voltage detection module 140, and control module 150 in the home energy storage system can be integrated into an energy storage device 002, which is electrically connected to the grid-connected circuit 120. In one embodiment, the hardware structure of the energy storage device 002 in the home energy storage system can be used not only in the embodiments of the present invention but also as a standalone energy storage device (disconnected from the grid-connected circuit 120), which is beneficial to improving the flexibility and versatility of the home energy storage system.

[0029] It should be noted that the integration of the current detection module 130, voltage detection module 140, and control module 150 on the control circuit board 001, and the integration of the energy storage module 110, current detection module 130, voltage detection module 140, and control module 150 on the energy storage device 002, are merely illustrative examples. The figure only shows the separate design of the grid-connected circuit 120 and the energy storage device 002, but it is not limited thereto. In other optional embodiments, the grid-connected circuit 120 can also be set inside the energy storage device 002, or the grid-connected circuit 120 and the energy storage device 002 can be designed as an integral unit. The embodiments of the present invention do not limit the setting method of each structure in the home energy storage system.

[0030] In this embodiment of the invention, connecting a home energy storage system to the mains power access point enables capacity expansion of the power supply network. Using both mains power and the energy storage module to supply power to the electrical load solves the problem of insufficient mains power supply. Installation is simple and the modification cost is low. By setting a voltage detection module, the conduction state of the first switch can be controlled in a timely manner when the mains power fails, preventing backflow of energy from the energy storage module to the mains power. By setting a current detection module, the output of the energy storage module can be adjusted in a timely manner when backflow occurs, improving the energy utilization rate of the energy storage module and preventing backflow of energy from the energy storage module to the mains power when both the energy storage module and the mains power are supplied simultaneously. Furthermore, by setting the current and voltage detection modules to only collect the current and voltage of the first switch, and having the control module directly control the output power of the first switch and the energy storage module in the grid-connected circuit, signal delay can be reduced, response speed can be improved, and it is beneficial to react promptly when the mains power fails or when power in the energy storage device flows back to the mains power, improving response speed and control accuracy.

[0031] Optional, Figure 2 This is a schematic diagram of another home energy storage system provided in an embodiment of the present invention, for reference. Figure 2 The home energy storage system also includes a power distribution circuit 160, which includes a circuit breaker F0 and a power distribution branch 161. The first end of the circuit breaker F0 is connected to the second end of the first switch K1, and the second end of the circuit breaker F0 is connected to the first end of the power distribution branch 161. The second end of the power distribution branch 161 is used to connect the electrical load.

[0032] The circuit breaker F0 can be used to connect the mains power supply to the electrical load, or to connect the energy storage module 110 to the electrical load. Circuit breaker F0 is typically in a closed, conducting state. Distribution branch 161 can distribute electrical energy from the mains power supply or the energy storage module 110 to one or more electrical loads. In one embodiment, distribution branch 161 includes multiple branch circuit breakers F1, ..., Fn, where n is a positive integer. By controlling the states of the branch circuit breakers F1, ..., Fn, distribution branch 161 can selectively distribute mains power and / or electrical energy from the energy storage module 110 to some or all of the electrical loads. By setting up distribution circuit 160, the electrical loads can be protected, preventing excessive current from damaging the electrical loads after the power supply network is upgraded or expanded.

[0033] Optional, continue to refer to Figure 2 The control module 150 is configured to control the first switch K1 to turn on when the voltage at the first terminal of the first switch K1 is greater than zero, and to control the first switch K1 to turn off when the voltage at the first terminal of the first switch K1 is zero.

[0034] For example, the control module 150 can determine whether the mains power is interrupted based on the voltage detection result of the voltage detection module 140. A voltage greater than zero at the first terminal of the first switch K1 indicates that the mains power is on, while a voltage of zero at the first terminal of the first switch K1 indicates that the mains power is interrupted. When the mains power is on, the first switch K1 is turned on, which can establish a transmission path between the mains power and the load. The mains power can work together with the energy storage module 110 to supply power to the load, or the mains power can charge the energy storage module 110. When the mains power is interrupted, the first switch K1 is turned off, which can prevent the energy from the energy storage module 110 from flowing back to the mains power. By controlling the conduction state of the first switch K1 based solely on the voltage detection result at the first terminal of the first switch K1, the signal delay of bilateral sampling can be reduced, which is beneficial to improving the response speed and increasing the stability of the power supply. It can also disconnect the connection between the mains power and the energy storage module 110 in a timely manner when the mains power is interrupted, preventing reverse current.

[0035] Optional, continue to refer to Figure 2 The energy storage module 110 includes an energy storage unit 111 and an AC / DC bidirectional conversion unit 112; the energy storage unit 111 includes a battery pack and a battery management circuit. Figure 2 (Not shown in the image); the battery pack in the energy storage unit 111 is electrically connected to the second terminal of the first switch K1 via the AC / DC bidirectional conversion unit 112; the battery management circuit in the energy storage unit 111 is configured to collect the battery pack's power information and transmit the battery pack's power information to the control module. In one embodiment, the battery pack in the energy storage unit 111 can supply power to the current detection module 130, the voltage detection module 140, and the control module 150. The control module 150 is configured to receive the battery pack's power information when the voltage at the first terminal of the first switch K1 is greater than zero, and to control the AC / DC bidirectional conversion unit 112 to be in rectification mode when the battery pack's power is less than or equal to a charging power threshold, and to control the AC / DC bidirectional conversion unit 112 to be in inverter mode when the battery pack's power is greater than a discharging power threshold.

[0036] The battery pack's power information includes, but is not limited to, parameters such as the remaining percentage of battery power and the total remaining energy. Rectification mode refers to the operating mode that converts AC to DC power; when the AC / DC bidirectional conversion unit 112 is in rectification mode, it can charge the battery pack. Inverter mode refers to the operating mode that converts DC to AC power; when the AC / DC bidirectional conversion unit 112 is in inverter mode, it can discharge the battery pack.

[0037] The charging threshold is used to indicate that the battery pack has a low charge level and needs to be charged; the discharging threshold is the threshold that the battery pack has a high charge level and can be discharged. When the battery pack's charge level is a percentage of the remaining charge level, both the charging threshold and the discharging threshold are also percentages of the remaining charge level. The charging threshold and the discharging threshold can be the same or different, and this embodiment of the invention does not impose any limitations.

[0038] For example, when there is mains power, the first switch K1 is turned on, and the control module 150 can control the operating mode of the AC / DC bidirectional conversion unit 112 according to the battery pack's charge level. When the battery pack's charge level is less than or equal to the charging charge threshold, it indicates that the battery pack's charge level is low and needs charging. The control module 150 can control the AC / DC bidirectional conversion unit 112 to be in rectification mode, using mains power to charge the battery pack. When the battery pack's charge level is greater than the discharging charge threshold, it indicates that the battery pack's charge level is high and can be discharged. The control module 150 can control the AC / DC bidirectional conversion unit 112 to be in inverter mode, allowing the battery pack and mains power to simultaneously supply power to the electrical load. In this way, when there is mains power and the battery pack's charge level is high, the battery pack and mains power can jointly supply power to the electrical load, avoiding insufficient mains power supply during peak electricity consumption periods, which could affect the normal operation of the electrical load. When the battery pack's charge level is low, mains power is used to charge the battery pack, ensuring that the battery pack does not continuously discharge and become unusable.

[0039] It is understood that in other embodiments, the control module 150 can also receive battery pack power information when the voltage at the first terminal of the first switch K1 is not greater than zero (mains power off).

[0040] Based on the above embodiments, the control module 150 is further configured to control the AC / DC bidirectional conversion unit 112 to be in inverter mode when the voltage at the first terminal of the first switch K1 is zero.

[0041] For example, when there is no mains power, the control module 150 can control the AC / DC bidirectional conversion unit 112 to always be in inverter mode, so that the battery pack supplies power to the electrical load, ensuring that the electrical load can continue to work when the mains power is cut off.

[0042] Optional, continue to refer to Figure 2The current detection module 130 is used to detect the current direction at the first terminal of the first switch K1. The current detection module 130 is configured to output a positive current detection result when the current of the first switch K1 flows from the first terminal to the second terminal of the first switch K1, and to output a negative current detection result when the current of the first switch K1 flows from the second terminal to the first terminal of the first switch K1. The control module 150 is configured to control the energy storage module 110 to reduce its output power when the voltage at the first terminal of the first switch K1 is greater than zero and the current of the first switch is negative, until the current of the first switch K1 is no longer negative.

[0043] For example, when the voltage at the first terminal of the first switch K1 is greater than zero and the current of the first switch K1 is negative, the mains power is available, the first switch K1 is turned on, and the energy storage module 110 is in discharge mode. The energy of the energy storage module 110 flows back to the mains power. At this time, the output power of the energy storage module 110 is greater than the power consumption of the electrical load, so the output power of the energy storage module 110 needs to be reduced to reduce the backflow current until the output power of the energy storage module 110 equals the power consumption of the electrical load, and the backflow current is reduced to zero. When the backflow current is reduced to zero, it means that the current of the first switch K1 is zero, and the current detection result is zero, which is also a non-negative case. When the voltage at the first terminal of the first switch K1 is greater than zero and the current of the first switch K1 is positive, it means that the mains power and the energy storage module 110 jointly supply power to the electrical load, and there is no need to reduce the output power of the energy storage module 110.

[0044] Based on the above embodiments, the control module 150 is further configured to control the energy storage module 110 to increase its output power when the voltage at the first terminal of the first switch K1 is greater than zero and during the first power consumption period, until the maximum output power is reached or the current of the first switch K1 is no longer positive.

[0045] The first electricity consumption period can be the peak electricity consumption period, during which electricity prices are higher. In other implementations, the first electricity consumption period can also be customized by the user, for example, it can be set to a period when the user's electricity demand is higher.

[0046] For example, during periods when electricity prices are high or the load's electricity demand is high, the energy storage module 110 can be controlled to enter a discharge mode, increasing its output power and decreasing the forward current of the first switch K1 until the energy storage module 110 reaches its maximum output power or the forward current of the first switch K1 decreases to zero. In this way, during peak electricity consumption periods when the mains power supply is insufficient and / or electricity prices are high, the output power of the energy storage module 110 can be increased to ensure that the power supply can meet the load's electricity demand. It can also reduce mains power consumption during periods of high electricity prices, thereby lowering household electricity costs.

[0047] Based on the above embodiments, the control module 150 is further configured to control the energy storage module 110 to be in charging mode when the voltage at the first terminal of the first switch K1 is greater than zero and during the second power consumption period.

[0048] The second electricity consumption period can be a period of low electricity demand, during which electricity prices are lower. In other implementations, the second electricity consumption period can also be customized by the user, for example, it can be set to a period when the user's electricity demand is lower.

[0049] For example, during periods when mains power is abundant, electricity prices are relatively cheap, or the electricity demand of the electrical load is relatively low, the energy storage module 110 can be controlled to be in charging mode, using mains power to supply electricity to the electrical load and simultaneously using mains power to charge the energy storage module 110. This allows the module to store electricity when electricity prices are low and discharge it when electricity prices are high, thus transferring at least a portion of the household load's electricity consumption to be obtained from mains power when electricity prices are low, which helps reduce household electricity costs.

[0050] In optional embodiments, the home energy storage system may further include a first operating mode and a second operating mode for user selection, and may also include interactive devices for user interaction, including but not limited to a display screen and buttons. In the first operating mode, the control module 150 can receive battery pack power information when the voltage at the first terminal of the first switch K1 is greater than zero, and control the energy storage module 110 to charge when the battery pack power is less than or equal to the charging power threshold, and control the energy storage module 110 to discharge when the battery pack power is greater than the discharging power threshold. In this way, it can charge the battery pack in time when the battery pack power is low, and supply power to the load in time with the mains power when the battery pack power is high, thereby improving the performance of the home energy storage system. In the second operating mode, the control module 150 can control the energy storage module 110 to discharge during the first period, and control the energy storage module 110 to charge during the second period when the voltage at the first terminal of the first switch K1 is greater than zero, which can be customized according to actual needs.

[0051] Optional, continue to refer to Figure 2 The home energy storage system also includes an electricity meter 170; the energy storage module 110 is connected to the second terminal of the first switch K1 at the grid connection node M; the electricity meter 170 is electrically connected between the grid connection node M and the mains power; the control module 150 is configured to control the energy storage module 110 to increase its output power until it reaches the maximum output power when the voltage at the first terminal of the first switch K1 is greater than zero and during the first power consumption period; the control module 150 is also configured to control the electricity meter 170 to measure the amount of electricity flowing from the energy storage module 110 to the mains power when the current of the first switch is negative.

[0052] The first electricity consumption period can be the peak electricity consumption period, during which electricity prices are higher. The electricity meter 170 is used to measure the current flowing through the first switch K1. The electricity meter 170 can be installed on the side of the first terminal of the first switch K1 closest to the mains power supply, or it can be installed between the second terminal of the first switch K1 and the grid connection node M. In one embodiment, the electricity meter 170 can measure the current flowing from the first terminal of the first switch K1 to the second terminal of the first switch K1; in another embodiment, the electricity meter 170 can measure the current flowing from the second terminal of the first switch K1 to the first terminal of the first switch K1.

[0053] For example, during periods when electricity prices are relatively cheap, the energy storage module 110 can be controlled to be in charging mode; during periods when electricity prices are relatively expensive, the energy storage module 110 can be controlled to be in discharging mode, and the output power of the energy storage module 110 can be increased. This can reduce the amount of mains electricity used, and the current of the energy storage module 110 can be fed back to the mains electricity through the electricity meter 170. In this way, during peak electricity periods when electricity prices are relatively high, the amount of expensive mains electricity used can be reduced, and the electricity stored in the energy storage module 110 can be sold back to the mains power grid, thereby reducing household electricity costs.

[0054] Optional, continue to refer to Figure 2 The home energy storage system also includes a second switch K2; the first end of the second switch K2 is electrically connected to the second end of the first switch K1, the second end of the second switch K2 is electrically connected to the energy storage module 110, and the control end of the second switch K2 is electrically connected to the control module 150. By setting the second switch K2, the connection between the energy storage module 110 and the external high-voltage electrical connection can be controlled. Especially when the system is installed or not started, the second switch K2 can be turned off to prevent electric shock from high voltage. In one embodiment, the second switch K2 can be integrated into the energy storage device 002.

[0055] Based on the above embodiments, both the first switch K1 and the second switch K2 are normally open relays.

[0056] A normally open relay is a relay whose contacts are initially open and only close to conduct after the coil is energized.

[0057] For example, the first switch K1 includes a first coil C1, and the second switch K2 includes a second coil C2. When the first coil C1 is energized, the first switch K1 is turned on; when the first coil C1 is de-energized, the first switch K1 is turned off. When the second coil C2 is energized, the second switch K2 is turned on; when the second coil C2 is de-energized, the second switch K2 is turned off. By setting both the first switch K1 and the second switch K2 to be normally open relays, both switches K1 and K2 can be kept in the off state when the control module 150 malfunctions, is not working, or is not installed, which helps to improve safety and avoid the risk of high-voltage electric shock.

[0058] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A home energy storage system, characterized in that, include: Energy storage module, which is used to store electrical energy or output electrical energy to the outside; A grid-connected circuit, comprising a first switch; a first terminal of the first switch is used to connect to mains power, and a second terminal of the first switch is used to connect to an electrical load; the energy storage module is electrically connected to the second terminal of the first switch. A current detection module is used to detect the current flowing through the first switch; A voltage detection module, wherein the voltage detection module is used to detect the voltage at the first terminal of the first switch; A control module is electrically connected to the voltage detection module and the current detection module. The control module is configured to control the conduction state of the first switch according to the voltage detection result of the voltage detection module, and to control the output of the energy storage module according to the current detection result of the current detection module.

2. The home energy storage system according to claim 1, characterized in that, Also includes: A power distribution circuit, the power distribution circuit including circuit breakers and power distribution branches; The first end of the circuit breaker is connected to the second end of the first switch, the second end of the circuit breaker is connected to the first end of the power distribution branch, and the second end of the power distribution branch is used to connect the electrical load.

3. The home energy storage system according to claim 1, characterized in that, The control module is configured to control the first switch to be turned on when the voltage at the first terminal of the first switch is greater than zero, and to control the first switch to be turned off when the voltage at the first terminal of the first switch is zero.

4. The home energy storage system according to claim 1, characterized in that, The energy storage module includes an energy storage unit and an AC / DC bidirectional conversion unit; the energy storage unit includes a battery pack and a battery management circuit. The battery pack is electrically connected to the second terminal of the first switch via the AC / DC bidirectional conversion unit; The battery management circuit is configured to collect the power information of the battery pack and transmit the power information of the battery pack to the control module; The control module is configured to receive the battery pack's power information when the voltage at the first terminal of the first switch is greater than zero, control the AC / DC bidirectional conversion unit to be in rectification mode when the battery pack's power is less than or equal to a charging power threshold, and control the AC / DC bidirectional conversion unit to be in inverter mode when the battery pack's power is greater than a discharging power threshold.

5. The home energy storage system according to claim 4, characterized in that, The control module is configured to control the AC / DC bidirectional conversion unit to be in inverter mode when the voltage at the first terminal of the first switch is zero.

6. The home energy storage system according to claim 1, characterized in that, The current detection module is used to detect the direction of the current at the first terminal of the first switch; The current detection module is configured to output a positive current detection result when the current of the first switch flows from the first terminal to the second terminal of the first switch, and to output a negative current detection result when the current of the first switch flows from the second terminal to the first terminal of the first switch. The control module is configured to control the energy storage module to reduce its output power when the voltage at the first terminal of the first switch is greater than zero and the current of the first switch is negative, until the current of the first switch is no longer negative.

7. The home energy storage system according to claim 6, characterized in that, The control module is configured to control the energy storage module to increase its output power when the voltage at the first terminal of the first switch is greater than zero and during the first power consumption period, until the maximum output power is reached or the current of the first switch is no longer positive.

8. The home energy storage system according to claim 1, characterized in that, The current detection module is used to detect the direction of the current at the first terminal of the first switch; The current detection module is configured to output a positive current detection result when the current of the first switch flows from the first terminal to the second terminal of the first switch, and to output a negative current detection result when the current of the first switch flows from the second terminal to the first terminal of the first switch. The home energy storage system also includes an electricity meter; the energy storage module is connected to the second terminal of the first switch at a grid connection node; the electricity meter is electrically connected between the grid connection node and the mains power supply. The control module is configured to control the energy storage module to increase its output power until it reaches the maximum output power when the voltage at the first terminal of the first switch is greater than zero and during the first power consumption period. The control module is also configured to control the meter to measure the amount of electricity flowing from the energy storage module to the mains power when the current of the first switch is negative.

9. The home energy storage system according to claim 7 or 8, characterized in that, The control module is configured to control the energy storage module to be in charging mode when the voltage at the first terminal of the first switch is greater than zero and it is during the second power consumption period.

10. The home energy storage system according to claim 1, characterized in that, Also includes: Second switch; The first terminal of the second switch is electrically connected to the second terminal of the first switch, the second terminal of the second switch is electrically connected to the energy storage module, and the control terminal of the second switch is electrically connected to the control module.

11. The home energy storage system according to claim 10, characterized in that, Both the first switch and the second switch are normally open relays.

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