Household energy storage system and control method and control device for household energy storage system

Abstract

A control method and control device for a household energy storage system, the control method comprising: obtaining the real-time monitoring current of each energy storage battery and the real-time output current output from the power output port; comparing the real-time monitoring current of each energy storage battery with the rated current, and comparing the real-time output current with the rated output current; if the real-time monitoring current is greater than the rated current, determining the current range within which the real-time monitoring current of the energy storage battery falls, and obtaining a corresponding first response strategy based on the current range within which the real-time monitoring current of the energy storage battery falls; executing the first response strategy for the energy storage battery without affecting the remaining energy storage batteries; and if the real-time output current is greater than the rated output current, obtaining and executing a second response strategy based on the execution result of the first response strategy. The present invention uses multiple protection mechanisms to avoid safety accidents, reduce safety risks, and ensure safety protection under extreme conditions such as short circuits.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a household energy storage system and a control method and a control device for the household energy storage system. Background Art

[0002] Currently, household energy storage systems are used to convert solar energy into electrical energy and store it. They can be charged when electricity prices are low and discharged when electricity prices are peak, thereby saving electricity bills. They also provide access to photovoltaic arrays and adopt an integrated microgrid design. They can operate in both off-grid and grid-connected modes, and can achieve seamless mode switching, which can greatly improve power supply reliability, optimize system operation, and maximize user benefits.

[0003] Household energy storage systems have many of the aforementioned advantages and are therefore widely used. However, existing household energy storage systems have few safety disconnection mechanisms and simple protection strategies. In particular, they cannot guarantee the safe operation of household energy storage systems in extreme situations such as short circuits, resulting in a high risk factor for users and poor user experience. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a household energy storage system and a control method and control device for the household energy storage system, which can avoid safety accidents and reduce safety risks through multiple protection mechanisms, and can ensure safety protection under extreme conditions such as short circuits, thereby ensuring user safety and good user experience.

[0005] The present invention provides a control method for a household energy storage system, wherein the household energy storage system includes a main controller, a power output port, and a plurality of energy storage batteries connected to the main controller and connected in parallel. The control method includes:

[0006] Obtaining the real-time monitoring current of each of the energy storage batteries and the real-time output current output from the power output port;

[0007] For each of the energy storage batteries, comparing the real-time monitored current of each of the energy storage batteries with the rated current, and comparing the real-time output current with the rated output current;

[0008] Execute the first process and the second process respectively;

[0009] The first process includes:

[0010] Based on the comparison result between the real-time monitored current and the rated current of each energy storage battery, if the real-time monitored current is greater than the rated current, determining the current range into which the real-time monitored current of the energy storage battery falls;

[0011] According to the current range into which the real-time monitored current of the energy storage battery falls, obtaining a first response strategy for the current range;

[0012] Executing a first response strategy for the energy storage battery without affecting the remaining energy storage batteries;

[0013] The second process includes:

[0014] Based on a comparison result between the real-time output current and the rated output current, if the real-time output current is greater than the rated output current, obtaining a second response strategy according to an execution result of the first process;

[0015] Implement the second response strategy.

[0016] In a preferred embodiment of the present invention, the current range into which the real-time monitoring current falls includes a first range, a second range, and a third range that are sequentially arranged from small to large and continuous.

[0017] The acquiring, according to the current range into which the real-time monitored current of the energy storage battery falls, a first response strategy for the current range includes:

[0018] When the real-time monitored current falls into a first range, executing a current over-limit warning;

[0019] When the real-time monitored current falls within a second range, controlling the household energy storage system to reduce the output power of the energy storage battery;

[0020] When the real-time monitored current falls into a third range, the household energy storage system is controlled to disable the energy storage battery, and the energy storage battery is controlled to be disconnected from the power output port.

[0021] In a preferred embodiment of the present invention, each of the energy storage batteries is provided with a battery management device capable of communicating with the main controller, and controlling the household energy storage system to reduce the output power of the energy storage battery includes:

[0022] Sending a power reduction signal to the battery management device of the energy storage battery, so that the battery management device reduces the output current of the energy storage battery;

[0023] Continue to obtain the real-time monitoring current of the energy storage battery and execute the first process of the energy storage battery.

[0024] In a preferred embodiment of the present invention, after receiving the power reduction signal, the battery management device reduces the output current of the energy storage battery, including:

[0025] Obtaining parameter information of the energy storage battery, and determining whether the parameter information is greater than a rated value;

[0026] Based on the judgment result, executing a third response strategy to make the parameter information lower than or equal to the rated value;

[0027] The parameter information includes at least one of the following parameters: voltage and temperature.

[0028] In a preferred embodiment of the present invention, the current range within which the real-time monitoring current falls also includes a fourth range that is continuous with the third range and larger than the third range.

[0029] The second response strategy obtained according to the execution result of the first process includes:

[0030] When the real-time monitored current of one of the energy storage batteries falls within the fourth range, the second response strategy is to disconnect the electrical connection between each of the energy storage batteries and the power output port, and control the household energy storage system to disable all of the energy storage batteries.

[0031] In a preferred embodiment of the present invention, the second response strategy obtained according to the execution result of the first process includes:

[0032] When the real-time monitored current of one or more of the energy storage batteries falls within the second range, comparing the difference between the real-time output current and the rated output current with the sum of the differences between the real-time monitored current of each of the one or more energy storage batteries and the rated current;

[0033] Based on the comparison result of the above steps, disconnecting the power output port from each of the one or more energy storage batteries;

[0034] After the first response strategy corresponding to the energy storage battery is executed, and the real-time monitored current of each of the one or more energy storage batteries falls within the first range or the second range, the connection between the power output port and each energy storage battery is reconnected.

[0035] In a preferred embodiment of the present invention, the second response strategy obtained according to the execution result of the first process further includes:

[0036] After the first response strategy corresponding to the energy storage battery is executed, if the real-time monitored current of one of the one or more energy storage batteries still falls within the third range, the connection between the one energy storage battery and the power output port is disconnected until the real-time monitored current of the one energy storage battery falls within the first range or the second range.

[0037] The present invention further provides a control device for a household energy storage system, wherein the household energy storage system includes a main controller, a power output port, and a plurality of energy storage batteries connected to the main controller and connected in parallel with each other, wherein the control device includes:

[0038] an acquisition unit, configured to acquire the real-time monitoring current of each of the energy storage batteries and the real-time output current output from the power output port;

[0039] a comparing unit, configured to compare the real-time monitored current of each energy storage battery with the rated current, and to compare the real-time output current with the rated output current;

[0040] a first judgment unit, configured to, based on a comparison result between the real-time monitored current and the rated current of each energy storage battery, determine, if the real-time monitored current is greater than the rated current, a current range into which the real-time monitored current of the energy storage battery falls, and then, based on the current range into which the real-time monitored current of the energy storage battery falls, obtain a first response strategy for the current range into which the real-time monitored current of the energy storage battery falls;

[0041] A first execution unit, configured to execute a first response strategy for the energy storage battery without affecting the other energy storage batteries;

[0042] a second judgment unit, configured to obtain a second response strategy based on a comparison result between the real-time output current and the rated output current, if the real-time output current is greater than the rated output current, according to an execution result of the first response strategy;

[0043] The second execution unit is configured to execute the second response strategy.

[0044] The present invention also provides a household energy storage system, characterized in that it includes a bus module and a plurality of energy storage battery systems electrically connected to the bus module, wherein:

[0045] The energy storage battery system comprises:

[0046] Energy storage batteries, used to store electrical energy;

[0047] A battery interface for transmitting electric energy from the energy storage battery to the bus module;

[0048] a first current monitoring device, configured to monitor the current output from the battery interface;

[0049] an energy storage control device, configured to collect current monitoring information from the first current monitoring device and adjust the output of the battery interface based on a command issued by the bus module;

[0050] The energy storage control device is further configured to execute a first process based on the difference between the real-time monitoring current of the first current monitoring device and the rated current,

[0051] The first process includes:

[0052] comparing the real-time monitored current of the first current monitoring device with the rated current of the battery interface, and if the real-time monitored current is greater than the rated current, determining a current range into which the real-time monitored current falls;

[0053] According to the current range that the real-time monitored current falls into, obtaining a first response strategy for the current range that falls into;

[0054] Executing a first response strategy for the energy storage battery system;

[0055] The bus module includes:

[0056] A power output port for outputting power;

[0057] a second current monitoring device, configured to monitor the current output from the power output port;

[0058] The bus control device includes a display unit, a control unit, and a main controller, wherein the main controller is configured to execute a second process based on the current monitoring information output by the power output port and the current monitoring information of each energy storage control device.

[0059] The second process includes:

[0060] Based on a comparison result between the real-time output current of the second current monitoring device and the rated output current of the power output port, if the real-time output current is greater than the rated output current, obtaining a second response strategy according to the execution result of the first process;

[0061] Implement the second response strategy.

[0062] The present invention also provides a non-volatile storage medium, characterized in that a program is stored in the non-volatile storage medium, and when the program is running, the device controls the non-volatile storage medium to execute any of the control methods described above.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] The control method for a household energy storage system provided by the present invention first determines the current range within which the real-time monitored current of each energy storage battery falls based on a comparison result between the real-time monitored current and the rated current. If the real-time monitored current is greater than the rated current, a first response strategy is executed for the energy storage battery based on the level of the current range within which the real-time monitored current falls, without affecting other energy storage batteries. This achieves a first level of safety protection for each energy storage battery. Furthermore, based on a comparison result between the real-time output current of the power output port and the rated output current, if the real-time output current is greater than the rated output current, a second response strategy is obtained and executed based on the execution result of the first response strategy for the energy storage battery. This achieves a further second level of safety protection for each energy storage battery and the entire household energy storage system. This avoids safety accidents, reduces safety risks, and ensures safety protection under extreme conditions such as short circuits, ensuring user safety and excellent user experience.

[0065] Other features and advantages of the present invention will be described in the following description and, in part, will become apparent from the description or be understood through implementation of the technical solutions of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures and / or processes particularly pointed out in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic structural diagram of a household energy storage system provided by an embodiment of the present invention;

[0067] Figure 2a A schematic diagram of a module of an energy storage battery pack of a household energy storage system provided by an embodiment of the present invention;

[0068] Figure 2b A schematic diagram of a module of a junction box of a household energy storage system provided by an embodiment of the present invention;

[0069] Figure 3a A schematic diagram of the circuit principle of a household energy storage system (junction box) provided in an embodiment of the present invention;

[0070] Figure 3b for Figure 3a Supplementary diagram of the circuit principle diagram of the household energy storage system (the mth energy storage battery system);

[0071] Figure 3c for Figure 3b Supplementary diagram of the circuit principle diagram of the household energy storage system (the first energy storage battery system);

[0072] Figure 3d for Figure 3c Supplementary diagram of the circuit principle diagram of the household energy storage system (support base);

[0073] Figure 3e A schematic diagram of the planar structure of an energy storage connector for a household energy storage system provided by an embodiment of the present invention;

[0074] Figure 4 A flow chart of a control method for a household energy storage system provided by an embodiment of the present invention;

[0075] Figure 5 A schematic structural diagram of a control device for a household energy storage system provided by an embodiment of the present invention;

[0076] Figure 6 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention;

[0077] Description of Figure Numbers:

[0078] 10-Household energy storage system;

[0079] 11-support base;

[0080] 12-Energy storage battery pack, 121-Energy storage battery system, 1211-Energy storage control device, 1212-Energy storage battery, 1213-Battery interface, 1214-First current monitoring device;

[0081] 13-junction box, 131-bus module, 1311-bus control device, 13111-display unit, 13112-control unit, 13113-main controller, 1312-power output port, 1313-second current monitoring device

[0082] 14-Energy storage connector, 141-Connector socket, 141a-Total positive power carrying terminal, 141a-1-First terminal, 141a-4-Fourth terminal, 141b-Total negative power carrying terminal, 141b-2-Second terminal, 141b-3-Third terminal, 141c-Communication signal terminal, 141d-Ground terminal, 142-Connector plug, 142a-Total positive power carrying terminal, 142b-Total negative power carrying terminal, 142c-Communication signal terminal, 142d-Ground terminal; DETAILED DESCRIPTION

[0083] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that these specific descriptions are only for ordinary technicians in this field to understand the present invention more easily and clearly, and are not a restrictive interpretation of the present invention; for example, the first and second mentioned in the embodiments of the present invention do not constitute a limitation thereto, but are merely for expressing the serial numbers of multiple identical or similar devices and mechanisms. Ordinary technicians in this field can also readjust these serial numbers for the convenience of expression or in the process of arranging technical solutions; and alternative solutions are described for some mechanisms in different embodiments, and these alternatives can also be applied to other identical or similar devices and mechanisms; and as long as there is no conflict, the various embodiments of the present invention and the various features in each embodiment can be combined with each other, and the technical solutions formed are all within the scope of protection of the present invention.

[0084] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments: Example

[0085] In the first place, see Figure 1-Figure 3e The present invention provides a household energy storage system 10. The household energy storage system 10 in this embodiment includes a support base 11, an energy storage battery pack 12 and a junction box 13 connected from bottom to top by an energy storage connector 14, wherein the junction box 13 is used to connect to an external inverter (not shown), and the junction box 13 is provided with a bus module 131.

[0086] The energy storage battery pack 12 is used to store and release electrical energy. The energy storage battery pack 12 includes m energy storage battery systems 121 (m is a natural number greater than 1) electrically connected to the above-mentioned bus module 131 and connected in parallel. The energy storage battery system 121 includes an energy storage control device 1211 (battery management device), an energy storage battery 1212 for storing electrical energy, a battery interface 1213 for transmitting the electrical energy of the energy storage battery 1212 to the bus module 131, and a first current monitoring device 1214 for monitoring the current output from the battery interface 1213.

[0087] The bus module 131 provided in the junction box 13 includes: a bus control device 1311, a power output port 1312 for outputting power, and a second current monitoring device 1313 for monitoring the current output from the power output port 1312. The bus control device 1311 includes a display unit 13111 (LCD display), a control unit 13112 (switch) and a main controller 13113. The above-mentioned energy storage control device 1211 is communicatively connected to the main controller 13113.

[0088] The support base 11 is used to support the entire household energy storage system 10 .

[0089] See Figure 2a-Figure 3e 485A and 485B are communication lines, through which the energy storage control device 1211 (battery management device) establishes communication with the main controller 13113; the energy storage control device 1211 will collect real-time dynamic information (voltage, temperature, current, etc.) of the energy storage battery 1212 and upload it to the main controller 13113, thereby executing protection strategies such as power on and off, charging and discharging, and data storage of the household energy storage system 10; at the same time, the main controller 13113 of the junction box 13 can display the received real-time dynamic information and operating status of the energy storage battery 1212 on the display unit 13111, allowing users to better understand the operating status of the entire product.

[0090] In this embodiment, the energy storage control device 1211 is configured to collect current monitoring information from the first current monitoring device 1214 and adjust the output of the battery interface 1213 based on the command issued by the bus module 131;

[0091] Furthermore, the energy storage control device 1211 is further configured to execute a first process based on the difference between the real-time monitoring current of the first current monitoring device 1214 and the rated current. The first process includes:

[0092] Based on the comparison result between the real-time monitoring current of the first current monitoring device 1214 and the rated current of the battery interface 1213, if the real-time monitoring current is greater than the rated current, determining the current range into which the real-time monitoring current falls;

[0093] According to the current ranges of different sizes into which the real-time monitoring current falls, a first response strategy corresponding to the current range of different sizes is obtained, and the first response strategy for the energy storage battery system 121 is executed.

[0094] The main controller 13113 is configured to execute a second process based on the current monitoring information output by the power output port 1312 and the current monitoring information of each energy storage control device 1211. The second process includes:

[0095] Based on the comparison result between the real-time output current of the second current monitoring device 1313 and the rated output current of the power output port 1312, if the real-time output current is greater than the rated output current, the second response strategy is obtained and executed according to the execution result of the first process.

[0096] The execution of the first and second processes will be described in detail in the following control method. As can be seen from the above, the household energy storage system 10 provided in this embodiment can achieve safety protection for each energy storage battery and the entire household energy storage system 10, and is safe to use and has good use effects.

[0097] Also, see Figure 2a-Figure 3e The energy storage connector 14 in this embodiment includes a plug-in connector socket 141 and a connector plug 142. The energy storage connector 14 integrates three connection functions: a total positive power current-carrying terminal 141a (142a), a total negative power current-carrying terminal 141b (142b) and a communication signal terminal 141c (142c), that is, it integrates a communication signal circuit and a power current-carrying circuit. The energy storage battery pack 12 of the household energy storage system 10 is connected to the junction box 13 through the connector socket 141 and the connector plug 142 to realize charging and discharging of the energy storage power circuit and real-time communication, thereby saving the production and installation of external power wiring harnesses and communication wiring harnesses, reducing the operation difficulty and electric shock risk of terminal installers; at the same time, the de-wiring design makes the appearance of the entire household energy storage system more simple and beautiful; in addition, the energy storage connector 14 is also provided with a grounding terminal 141d (142d), which can play a grounding protection role when AC power invades the cabinet of the household energy storage system 10.

[0098] Continue reading Figure 2a-Figure 3e By manipulating the control unit 13112 (self-resetting switch), the entire household energy storage system 10 can be turned on and off with one button. When the self-resetting switch is pressed, the bus module 131 and each energy storage battery system 121 are powered on and started.

[0099] Continue reading Figure 2a-Figure 3e In this embodiment, the total positive power current-carrying terminal 141a (142a) and the total negative power current-carrying terminal 141b (142b) of the energy storage connector 14 can be designed to carry out corresponding current-carrying design according to the corresponding load. For example, if the load rated current is different in different application scenarios, different sizes of the total positive power current-carrying terminal 141a and the total negative power current-carrying terminal 141b can be designed to determine the rated value. At the same time, the first terminal 141a-1 and the fourth terminal 141a-4 of the total positive power current-carrying terminal 141a, and the second terminal 141b-2 and the third terminal 141b-3 of the total negative power current-carrying terminal 141b can be connected in parallel through cables or conductive bars to double the rated value, thereby achieving the maximum current-carrying capacity of the current-carrying terminal and giving full play to the advantage of high-rate discharge of the battery cell.

[0100] In a second aspect, the present invention provides a control method for a household energy storage system, see Figure 4 , specifically including:

[0101] S100: Acquire the real-time monitoring current (i1, i2, ..., im) of each energy storage battery and the real-time output current I output from the power output port, where I = i1 + i2 + ... + im;

[0102] S200: For each energy storage battery, compare the real-time monitored current (i1, i2...im) of each energy storage battery with the rated current in, and compare the real-time output current I with the rated output current In. Each energy storage battery may be set with a uniform rated current in, or each energy storage battery may be set with its own rated current in1, in2...inm. The rated current in, in1, in2...inm, and rated output current In are all set safety current values ​​for the household energy storage system. The rated output current In is generally set to be equal to / less than the sum of m ins or the sum of in1, in2...inm, but may also be set to be greater than the sum of m ins or the sum of in1, in2...inm.

[0103] Specifically,

[0104] Executing the first process includes:

[0105] S300: When a uniform rated current in is set for each energy storage battery, a comparison is performed between the real-time monitored current (i1, i2, ...im) of each energy storage battery and the rated current in. If a real-time monitored current (i1, i2, ...im) is greater than the rated current in, the current range within which the real-time monitored current (i1, i2, ...im) of the energy storage battery falls is determined;

[0106] When each energy storage battery is set to have its own rated current in1, in2...inm, based on the comparison result between the real-time monitored current (i1, i2...im) of each energy storage battery and the corresponding rated current in1, in2...inm, if a real-time monitored current (i1, i2...im) is greater than the corresponding rated current in1, in2...inm, then the current range within which the real-time monitored current (i1, i2...im) of the energy storage battery falls is determined;

[0107] S400: Obtaining a first response strategy for the current range within which the real-time monitored current (i1, i2, ...im) of the energy storage battery falls according to the current ranges of different sizes;

[0108] S500: Executing a first response strategy for the energy storage battery without affecting other energy storage batteries;

[0109] S510: After executing the first response strategy for the energy storage battery, the first process further includes:

[0110] Continue to obtain the real-time monitoring current (i1, i2...im) of the energy storage battery, and execute the above-mentioned first process of the energy storage battery.

[0111] Executing the second process includes:

[0112] S600: Based on the comparison result between the real-time output current I and the rated output current In, if the real-time output current I is greater than the rated output current In, obtaining a second response strategy according to the execution result of the above-mentioned first process;

[0113] S700: Execute the second response strategy.

[0114] S800: If no real-time monitored current (i1, i2...im) is greater than the rated current in, or is not greater than the corresponding rated current in1, in2...inm, then each energy storage battery and the household energy storage system are operating normally.

[0115] The control method for the household energy storage system provided in this embodiment first compares the real-time monitoring current (i1, i2...im) of each energy storage battery with the rated current in. If the real-time monitoring current (i1, i2...im) is greater than the rated current in, or greater than the corresponding rated current in1, in2...inm, then the current range into which the real-time monitoring current (i1, i2...im) of the energy storage battery falls is determined. Then, based on the different levels of the current range within which the current falls, a first response strategy is executed for the energy storage battery without affecting other energy storage batteries, thereby achieving the first Furthermore, based on the comparison result between the real-time output current I outputted from the power output port and the rated output current In, if the real-time output current I is greater than the rated output current In, a second response strategy is further obtained and executed according to the execution result of the first response strategy of the above energy storage battery, thereby achieving a further second-level safety protection for each energy storage battery and the safety protection of the entire household energy storage system, thereby avoiding safety accidents and reducing safety risks, and ensuring safety protection under extreme conditions such as short circuits, ensuring user safety and good user experience.

[0116] In this embodiment, specifically, the current range within which the above-mentioned real-time monitoring current (i1, i2 ... im) falls includes a first range (n1-n2), a second range (n2-n3), and a third range (n3-n4) that are sequentially ordered from small to large and continuous, representing different levels of the current range within which the real-time monitoring current (i1, i2 ... im) falls. For example, taking the example of each energy storage battery being set with a uniform rated current in, the first range (n1-n2) is (1.0 in - 1.2 in), the second range (n2-n3) is [1.2 in - 1.5 in], and the third range (n3-n4) is (1.5 in - 2.0 in];

[0117] Therefore, according to the current ranges of different sizes into which the real-time monitored current (i1, i2, ...im) of the energy storage battery falls, a first response strategy for the current range falls is obtained, including:

[0118] When the real-time monitored current (i1, i2...im) falls into the first range (n1~n2), a current over-limit warning is executed;

[0119] When the real-time monitored current (i1, i2...im) falls into the second range (n2-n3), the household energy storage system is controlled to reduce the output power of the energy storage battery;

[0120] When the real-time monitored current (i1, i2...im) falls into the third range (n3~n4), the household energy storage system is controlled to deactivate the energy storage battery and disconnect the energy storage battery from the power output port. The main controller may send instructions to the battery management device, fuse, and circuit breaker for disconnection protection, forming triple protection.

[0121] The above real-time monitoring current (i1, i2...im) and first response strategy information are collected by the main controller and displayed on the display screen, allowing users to better understand the operating status of each energy storage battery and the household energy storage system.

[0122] As described above, based on the different levels of current ranges into which the real-time monitored current (i1, i2...im) of the energy storage battery falls, corresponding first response strategies of different levels are adopted to specifically protect each energy storage battery and the household energy storage system, ensuring safety and better user experience.

[0123] In this embodiment, when the real-time monitored current (i1, i2, ...im) falls within the second range (n2-n3), controlling the household energy storage system to reduce the output power of the energy storage battery specifically includes:

[0124] The main controller sends a power reduction signal to the battery management device of the energy storage battery, causing the battery management device to reduce the output current of the energy storage battery;

[0125] After receiving the power reduction signal, the battery management device reduces the output current of the energy storage battery, including:

[0126] Obtaining parameter information of the energy storage battery, the parameter information including at least one of voltage and temperature, and determining whether the parameter information is greater than a rated value;

[0127] If the parameter information is greater than the rated value, executing the third response strategy to make the parameter information lower than or equal to the rated value;

[0128] The third coping strategy mentioned above may be implemented by providing a variable resistor to reduce the output voltage of the energy storage device and by using a cooling system such as a fan to reduce the temperature.

[0129] Continue to obtain the real-time monitoring current of the energy storage battery and execute the first process of the energy storage battery, so that the real-time monitoring current (i1, i2...im) of the energy storage battery falls into the first range (n1~n2) until it is no greater than the rated current in, ensuring that all energy storage batteries and the entire household energy storage system return to normal operation.

[0130] In this embodiment, in the first case, when the current range within which the real-time monitored current (i1, i2...im) falls also includes a fourth range that is continuous with the third range and larger than the third range, then taking the example of setting a uniform rated current in for each energy storage battery, the fourth range is greater than 2.0in.

[0131] According to the execution result of the first process, the second response strategy obtained includes:

[0132] When the real-time monitored current (i1, i2...im) of any energy storage battery falls within the fourth range (for example, i1 is greater than 2.0in), the second response strategy is to disconnect the electrical connection between each energy storage battery and the power output port, and control the household energy storage system to disable all energy storage batteries. For example, in the event of extreme conditions such as internal or external short circuits, the above response strategy is adopted to safely protect all energy storage batteries and the entire household energy storage system, avoiding product damage and ensuring user safety.

[0133] In this embodiment, in the second case, according to the execution result of the first process, the second response strategy obtained includes:

[0134] When the real-time monitored current (i1, i2, ...im) of one or more energy storage batteries falls within the second range, comparing the difference ΔI between the real-time output current I and the rated output current In with the sum Sum (Δi) of the differences between the real-time monitored current (i1, i2, ...im) of each of the one or more energy storage batteries and the rated current in, or the sum Sum (Δi) of the differences between the real-time monitored current (i1, i2, ...im) of each of the one or more energy storage batteries and the rated current in;

[0135] Based on the comparison results of the above steps, when Sum (△i) is greater than or equal to △I, disconnecting the power output port from each of the one or more energy storage batteries;

[0136] After the first response strategy corresponding to the energy storage battery is executed, and the real-time monitored current (i1, i2...im) of each energy storage battery of the one or more energy storage batteries falls within the first range or the second range, the connection between the power output port and each energy storage battery is reconnected.

[0137] As described above, the linkage relationship between the energy storage battery and the power output port is utilized to avoid the energy storage battery being managed by its various battery management devices and ignoring the output current of the power output port. This prevents the phenomenon that the power output port outputs excessive power and causes dangerous situations due to the situation where multiple energy storage batteries exceed the rated current but no corresponding measures are taken. This not only ensures the effective operation of each energy storage battery, but also ensures the safe output of the entire household energy storage system.

[0138] Furthermore, according to the execution result of the first process, the second response strategy obtained also includes:

[0139] After the first response strategy corresponding to the energy storage battery is executed, if the real-time monitored current (i1, i2, ...im) of one of the one or more energy storage batteries still falls within the third range, the connection between the one energy storage battery and the power output port is disconnected until the real-time monitored current (i1, i2, ...im) of the one energy storage battery falls within the first range or the second range.

[0140] In this step, when the monitored current of one or more energy storage batteries exhibits a significant leakage, the connection between the power output port and the energy storage battery is promptly disconnected. This prevents the excessive current of the energy storage battery from further increasing and potentially endangering the output of the remaining energy storage batteries or even the entire household energy storage system. This also ensures that, even if one or more of the energy storage batteries experience an output problem, the remaining safety output batteries can continue to output current, thereby continuously supplying power to the outside world. Furthermore, after the battery management device within the energy storage battery stabilizes the current within the energy storage battery, the connection with the power output port is restored. This allows for real-time adjustment of the power supply within the entire household energy storage system, ensuring stable, continuous, and efficient current output. The current stabilization can be determined by the battery management device detecting that the output current of the energy storage battery has remained within the first or second range for a predetermined period of time, e.g., 10 seconds, and then determining that the output current of the energy storage battery has stabilized.

[0141] In the third respect, see Figure 5 The present invention further provides a control device 20 for a household energy storage system, which can implement the control method of the second embodiment, specifically including:

[0142] An acquisition unit 21 is used to acquire the real-time monitoring current (i1, i2, ...im) of each energy storage battery and the real-time output current I output from the power output port;

[0143] The comparison unit 22 is used to compare the real-time monitoring current (i1, i2, ...im) of each energy storage battery with the rated current in (in1, in2, ...inm), and to compare the real-time output current I with the rated output current In.

[0144] The first judgment unit 23 is configured to compare the real-time monitored current of each energy storage battery with the rated current. If the real-time monitored current is greater than the rated current, determine the current range within which the real-time monitored current of the energy storage battery falls, and then obtain a first response strategy for the current range within which the real-time monitored current of the energy storage battery falls according to the current range within which the real-time monitored current of the energy storage battery falls;

[0145] A first execution unit 24 is configured to execute a first response strategy for the energy storage battery without affecting other energy storage batteries;

[0146] The second judgment unit 25 is configured to determine, based on a comparison result between the real-time output current and the rated output current, if the real-time output current is greater than the rated output current, a second response strategy according to an execution result of the first response strategy;

[0147] The second execution unit 26 is configured to execute the second response strategy.

[0148] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, the computer-readable storage medium including a stored program, wherein when the program runs, the computer-readable storage medium is controlled to execute the control method for a household energy storage system of an embodiment of the present invention when the device is in operation.

[0149] like Figure 6 As shown, the computer device 30 of this embodiment includes: a processor 31, a memory 32, and a computer program 33 stored in the memory 32 and executable on the processor 31. When the computer program 33 is executed by the processor 31, the control method for the household energy storage system in the embodiment is implemented. To avoid repetition, they are not described here one by one.

[0150] The computer device 30 includes, but is not limited to, a processor 31 and a memory 32. Those skilled in the art will understand that Figure 6 This is merely an example of the computer device 30 and does not constitute a limitation of the computer device 30 . The computer device 30 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device 30 may also include input and output devices, network access devices, buses, etc.

[0151] The processor 31 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0152] The memory 32 can be an internal storage unit of the computer device 30, such as a hard drive or memory of the computer device 30. The memory 32 can also be an external storage device of the computer device 30, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash memory card, etc. equipped on the computer device 30. Furthermore, the memory 32 can include both an internal storage unit of the computer device 30 and an external storage device. The memory 32 is used to store computer programs and other programs and data required by the computer device 30. The memory 32 can also be used to temporarily store data that has been output or is about to be output.

[0153] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0154] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

[0155] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Anyone skilled in the art can utilize the above-disclosed practices and technical content to make numerous possible variations and simple substitutions to the present invention without departing from the scope of the present invention, and all such variations and substitutions are within the scope of protection of the present invention.

Claims

1. A control method for a household energy storage system, wherein the household energy storage system comprises a main controller, a power output port, and a plurality of energy storage batteries connected to the main controller and connected in parallel with each other, characterized in that: The control method includes: Obtaining the real-time monitoring current of each of the energy storage batteries and the real-time output current output from the power output port; For each of the energy storage batteries, comparing the real-time monitored current of each of the energy storage batteries with the rated current, and comparing the real-time output current with the rated output current; Execute the first process and the second process respectively; The first process includes: Based on the comparison result between the real-time monitored current and the rated current of each energy storage battery, if the real-time monitored current is greater than the rated current, determining the current range into which the real-time monitored current of the energy storage battery falls; According to the current range into which the real-time monitored current of the energy storage battery falls, obtaining a first response strategy for the current range; Executing a first response strategy for the energy storage battery without affecting the remaining energy storage batteries; The second process includes: Based on a comparison result between the real-time output current and the rated output current, if the real-time output current is greater than the rated output current, obtaining a second response strategy according to an execution result of the first process; implementing the second coping strategy; The current range into which the real-time monitoring current falls includes a first range, a second range, and a third range that are sequentially arranged from small to large. The acquiring, according to the current range into which the real-time monitored current of the energy storage battery falls, a first response strategy for the current range includes: When the real-time monitored current falls into a first range, executing a current over-limit warning; When the real-time monitored current falls within a second range, controlling the household energy storage system to reduce the output power of the energy storage battery; When the real-time monitored current falls within a third range, controlling the household energy storage system to deactivate the energy storage battery and disconnecting the energy storage battery from the power output port; The current range within which the real-time monitoring current falls also includes a fourth range that is continuous with the third range and larger than the third range. The second response strategy obtained according to the execution result of the first process includes: When the real-time monitored current of one of the energy storage batteries falls within the fourth range, the second response strategy is to disconnect the electrical connection between each of the energy storage batteries and the power output port, and control the household energy storage system to disable all of the energy storage batteries.

2. The control method according to claim 1, characterized in that: Each of the energy storage batteries is provided with a battery management device capable of communicating with the main controller, and the controlling of the household energy storage system to reduce the output power of the energy storage battery includes: Sending a power reduction signal to the battery management device of the energy storage battery, so that the battery management device reduces the output current of the energy storage battery; Continue to obtain the real-time monitoring current of the energy storage battery and execute the first process of the energy storage battery.

3. The control method according to claim 2, characterized in that: After receiving the power reduction signal, the battery management device reduces the output current of the energy storage battery, including: Obtaining parameter information of the energy storage battery, and determining whether the parameter information is greater than a rated value; Based on the judgment result, executing a third response strategy to make the parameter information lower than or equal to the rated value; The parameter information includes at least one of the following parameters: voltage and temperature.

4. The control method according to claim 1, wherein: The second response strategy obtained according to the execution result of the first process includes: When the real-time monitored current of one or more of the energy storage batteries falls within the second range, comparing the difference between the real-time output current and the rated output current with the sum of the differences between the real-time monitored current of each of the one or more energy storage batteries and the rated current; Based on the comparison result of the above steps, disconnecting the power output port from each of the one or more energy storage batteries; After the first response strategy corresponding to the energy storage battery is executed, and the real-time monitored current of each of the one or more energy storage batteries falls within the first range or the second range, the connection between the power output port and each energy storage battery is reconnected.

5. The control method according to claim 4, characterized in that: The second response strategy obtained according to the execution result of the first process further includes: After the first response strategy corresponding to the energy storage battery is executed, if the real-time monitored current of one of the one or more energy storage batteries still falls within the third range, the connection between the one energy storage battery and the power output port is disconnected until the real-time monitored current of the one energy storage battery falls within the first range or the second range.

6. A control device for a household energy storage system, the household energy storage system comprising a main controller, a power output port, and a plurality of energy storage batteries connected to the main controller and connected in parallel, characterized in that: The control device comprises: an acquisition unit, configured to acquire the real-time monitoring current of each of the energy storage batteries and the real-time output current output from the power output port; a comparing unit, configured to compare the real-time monitored current of each energy storage battery with the rated current, and to compare the real-time output current with the rated output current; a first judgment unit, configured to, based on a comparison result between the real-time monitored current and the rated current of each energy storage battery, determine, if the real-time monitored current is greater than the rated current, a current range into which the real-time monitored current of the energy storage battery falls, and then, based on the current range into which the real-time monitored current of the energy storage battery falls, obtain a first response strategy for the current range into which the real-time monitored current of the energy storage battery falls; A first execution unit, configured to execute a first response strategy for the energy storage battery without affecting the other energy storage batteries; a second judgment unit, configured to obtain a second response strategy based on a comparison result between the real-time output current and the rated output current, if the real-time output current is greater than the rated output current, according to an execution result of the first response strategy; a second execution unit, configured to execute the second response strategy; The current range into which the real-time monitoring current falls includes a first range, a second range, and a third range that are sequentially arranged from small to large. The acquiring, according to the current range into which the real-time monitored current of the energy storage battery falls, a first response strategy for the current range includes: When the real-time monitored current falls into a first range, executing a current over-limit warning; When the real-time monitored current falls within a second range, controlling the household energy storage system to reduce the output power of the energy storage battery; When the real-time monitored current falls within a third range, controlling the household energy storage system to deactivate the energy storage battery and disconnecting the energy storage battery from the power output port; The current range within which the real-time monitoring current falls also includes a fourth range that is continuous with the third range and larger than the third range. The second coping strategy obtained according to the execution result of the first coping strategy includes: When the real-time monitored current of one of the energy storage batteries falls within the fourth range, the second response strategy is to disconnect the electrical connection between each of the energy storage batteries and the power output port, and control the household energy storage system to disable all of the energy storage batteries.

7. A household energy storage system, characterized in that: It includes a bus module and a plurality of energy storage battery systems electrically connected to the bus module, wherein: The energy storage battery system comprises: Energy storage batteries, used to store electrical energy; A battery interface for transmitting electrical energy from the energy storage battery to the bus module; a first current monitoring device, configured to monitor the current output from the battery interface; an energy storage control device, configured to collect current monitoring information from the first current monitoring device and adjust the output of the battery interface based on a command issued by the bus module; The energy storage control device is further configured to execute a first process based on the difference between the real-time monitoring current of the first current monitoring device and the rated current, The first process includes: comparing the real-time monitored current of the first current monitoring device with the rated current of the battery interface, and if the real-time monitored current is greater than the rated current, determining a current range into which the real-time monitored current falls; According to the current range that the real-time monitored current falls into, obtaining a first response strategy for the current range that falls into; Executing a first response strategy for the energy storage battery system; The bus module includes: A power output port for outputting power; a second current monitoring device, configured to monitor the current output from the power output port; The bus control device includes a display unit, a control unit, and a main controller, wherein the main controller is configured to execute a second process based on the current monitoring information output by the power output port and the current monitoring information of each energy storage control device. The second process includes: Based on a comparison result between the real-time output current of the second current monitoring device and the rated output current of the power output port, if the real-time output current is greater than the rated output current, obtaining a second response strategy according to the execution result of the first process; implementing the second coping strategy; The current range into which the real-time monitoring current falls includes a first range, a second range, and a third range that are sequentially arranged from small to large. The step of obtaining a first response strategy for the current range within which the real-time monitored current falls, according to the current range within which the real-time monitored current falls, includes: When the real-time monitored current falls into a first range, executing a current over-limit warning; When the real-time monitored current falls within a second range, controlling the household energy storage system to reduce the output power of the energy storage battery; When the real-time monitored current falls within a third range, controlling the household energy storage system to deactivate the energy storage battery and disconnecting the energy storage battery from the power output port; The current range within which the real-time monitoring current falls also includes a fourth range that is continuous with the third range and larger than the third range. The second response strategy obtained according to the execution result of the first process includes: When the real-time monitored current of one of the energy storage batteries falls within the fourth range, the second response strategy is to disconnect the electrical connection between each of the energy storage batteries and the power output port, and control the household energy storage system to disable all of the energy storage batteries.

8. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a program, and when the program is running, the device controls the non-volatile storage medium to execute the control method according to any one of claims 1 to 5.

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