Energy storage system control circuit and energy storage system

Abstract

The invention discloses an energy storage system control circuit, an energy storage system control method and an energy storage system. The circuit comprises a branch switching assembly, an on-off switching assembly, an auxiliary power supply assembly and a control assembly, the branch switching assembly and the auxiliary power supply assembly form a first branch, and the branch switching assembly, the on-off switching assembly and the auxiliary power supply assembly form a second branch; the control assembly is configured to control the connection mode of the energy storage system control circuit to be switched between the first branch and the second branch; the control assembly is further configured to control on-off of the auxiliary power supply assembly. According to the invention, state switching can be carried out on whether the on-off switching assembly is connected to the control circuit or not, on-off control is carried out on the auxiliary power supply process of the auxiliary power supply, the on-off switching assembly is separated from the control circuit when the electric quantity of the photovoltaic energy storage battery is low at night, and the overall working state of the circuit is adjusted, so that the power supply efficiency is improved. The standby loss of the system is reduced while the function of the energy storage system is ensured, and the maximum utilization of photovoltaic energy is realized.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and in particular to an energy storage system control circuit and an energy storage system. Background Art

[0002] In the current related technologies, the external power supply method for photovoltaic energy storage systems is generally to draw power directly from the battery pack. This method may cause loss and waste of battery power when the energy storage system is currently in standby or not in working state, and may even cause over-discharge of the battery pack. Although the activation and forced shutdown of the energy storage system can be controlled by a button switch, the energy storage system can only be reactivated manually after the system is shut down, and self-start cannot be achieved. Under unattended conditions, it will cause loss of photovoltaic power generation energy. Summary of the invention

[0003] The present application provides an energy storage system control circuit and an energy storage system.

[0004] The energy storage system control circuit involved in the embodiment of the present application includes a branch switching component, an on-off switching component, an auxiliary power supply component and a control component, wherein the branch switching component and the auxiliary power supply component constitute a first branch, and the branch switching component, the on-off switching component and the auxiliary power supply component constitute a second branch;

[0005] The control component is configured to control the branch switching component to switch the working state so that the connection mode of the energy storage system control circuit is switched between the first branch and the second branch;

[0006] The control component is also configured to control the on-off switching component to switch the working state so as to control the on-off of the auxiliary power supply component.

[0007] In some embodiments, the branch switching component has a first working state and a second working state;

[0008] In the first working state, the energy storage system control circuit is connected in the first branch;

[0009] In the second working state, the energy storage system control circuit is connected in the second branch.

[0010] In some embodiments, the branch switching component is a magnetic latching relay, and the magnetic latching relay includes two groups of input pins and four groups of output pins;

[0011] When the first input pin is connected to the first output pin, and the second input pin is connected to the second output pin, the energy storage system control circuit is connected in the first branch;

[0012] When the first input pin is connected to the third output pin, and the second input pin is connected to the fourth output pin, the energy storage system control circuit is connected in the second branch.

[0013] In certain embodiments, the circuit further comprises a first drive component, the first drive component being powered by the auxiliary power supply component;

[0014] The first driving component is configured to be controlled by the control component to control the branch switching component to switch to the first working state or to switch to the second working state.

[0015] In certain embodiments, the circuit further comprises a startup component;

[0016] The starting component is configured to be controlled by the control component to switch the working state of the on-off switching component to control the on-off of the auxiliary power supply component.

[0017] In some embodiments, the on-off switching component is a PMOS, an NMOS or a relay, and the operating level of the on-off switching component is controlled by the control component.

[0018] In certain embodiments, the circuit further comprises a second drive component, the second drive component being powered by the auxiliary power supply component;

[0019] The second driving component is configured to be controlled by the control component to drive the on-off switching component to convert its working level.

[0020] In certain embodiments, the circuit further includes a plurality of input diodes configured to provide a photovoltaic input and / or a battery input to the energy storage system control circuit.

[0021] In some embodiments, the circuit further comprises a plurality of input diodes, wherein a first input diode is connected to the first input pin, a second input diode is connected to the second input pin, and a third input diode is directly connected to the on-off switching component.

[0022] In this way, the energy storage system control circuit in the embodiment of the present application can realize the state switching of whether the on-off switching component is connected to the control circuit by setting the branch switching component, so as to realize the on-off control of the auxiliary power supply process of the auxiliary power supply when the on-off switching component is connected to the control circuit, and at night when the power of the photovoltaic energy storage battery is low, the on-off switching component is disconnected from the control circuit, so that when the lighting conditions are met again, the auxiliary power supply can directly accept the photovoltaic input for self-starting and charge the energy storage battery. At the same time, it can also automatically drive the branch switching component to switch the state of the energy storage system control circuit when the power of the energy storage battery reaches the requirement, and control the on-off switching component to connect to the control circuit again, thereby reducing the standby loss of the system while ensuring the function of the energy storage system and maximizing the utilization of photovoltaic energy.

[0023] The energy storage system control method in the embodiment of the present application is implemented based on the above energy storage system control circuit, and the method includes:

[0024] In response to a power-on operation performed by a user on the startup component, controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be turned on;

[0025] When it is detected that the energy storage system is not currently being charged, detecting a state of charge of a battery in the energy storage system;

[0026] When the state of charge satisfies a first condition, controlling the system to enter a low power consumption state and detecting the state of charge of a battery in the energy storage system;

[0027] When the state of charge satisfies a second condition, controlling the first drive component to switch the working state of the branch switching component so that the connection mode of the energy storage system control circuit is switched to the second branch;

[0028] Controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be cut off;

[0029] acquiring the state of charge of the battery during the charging process of the battery in response to automatic start-up of the auxiliary power supply in the event that the photovoltaic input voltage is detected to be greater than the start-up voltage of the auxiliary power supply assembly;

[0030] When the state of charge satisfies a third condition, controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be turned on;

[0031] Control the working state of the first drive component switching branch switching component to switch the connection mode of the energy storage system control circuit to the first branch.

[0032] In certain embodiments, the method further comprises:

[0033] When the state of charge does not satisfy the first condition, the state of charge of the battery in the energy storage system is detected.

[0034] In certain embodiments, the method further comprises:

[0035] When the state of charge does not satisfy the second condition, the low power consumption state is maintained and the state of charge of the battery in the energy storage system is detected.

[0036] In certain embodiments, the method further comprises:

[0037] When the state of charge does not satisfy a third condition, the charging process is maintained and the state of charge of the battery is acquired.

[0038] In this way, the present application can be based on the above-mentioned energy storage system control circuit, automatically trigger charging and switch the connection mode when the battery SOC in the energy storage system is too low, and prevent the battery from over-discharging by directly connecting the photovoltaic input to the auxiliary power supply and opening the battery input. At the same time, when the light is restored, the auxiliary power supply is used to automatically switch the connection mode by self-starting under the photovoltage. After the battery charging reaches the target, the energy storage system is automatically switched to a normal working state, which can maximize the use of photovoltaic energy and reduce energy waste while minimizing the increase in standby power consumption and ensuring the normal operation of the energy storage system.

[0039] The energy storage system in the implementation manner of the present application includes the above-mentioned energy storage system control circuit, and can implement the above-mentioned energy storage system control method.

[0040] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0042] Figure 1 A schematic diagram of the circuit structure of the energy storage system control circuit in the implementation manner of the present application;

[0043] Figure 2 It is a flowchart of the energy storage system control method in the implementation manner of the present application.

[0044] Among them: K1, branch switching component; 101, on-off switching component; 102, auxiliary power supply component; 103, control component; 104, first drive component; 105, starting component; 106, second drive component; D1, first input diode; D2, second input diode; D3, third input diode. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and cannot be understood as limiting the embodiments of the present application.

[0046] See also Figure 1 The energy storage system control circuit in the embodiment of the present application includes a branch switching component K1, an on-off switching component 101, an auxiliary power supply component 102 and a control component 103, wherein the branch switching component K1 and the auxiliary power supply component 102 constitute a first branch, and the branch switching component K1, the on-off switching component 101 and the auxiliary power supply component 102 constitute a second branch;

[0047] The control component 103 is configured to control the branch switching component K1 to switch the working state so that the connection mode of the energy storage system control circuit is switched between the first branch and the second branch;

[0048] The control component 103 is also configured to control the on-off switching component 101 to switch the working state so as to control the on-off of the auxiliary power supply component 102 .

[0049] Specifically, see Figure 1 , Figure 1 The electrical connection relationship between the various components in the energy storage system control circuit is exemplarily shown, including four main components: a branch switching component K1, an on-off switching component 101, an auxiliary power supply component 102 and a control component 103.

[0050] The working state of the branch switching component K1 is controlled by the control component 103, and its function is to switch the current connection mode of the energy storage system control circuit by switching its own working state. In some embodiments, the connection mode of the energy storage system control circuit includes two main branches. The first branch (see Figure 1 The branch switching component K1 is connected to the auxiliary power supply component 102 via the on-off switching component 101, and the second branch (see Figure 1The branch switching component K1 directly connects the auxiliary power supply component 102 to the auxiliary power supply component 102. Whenever the branch switching component K1 switches the working state, the connection mode of the energy storage system control circuit is switched between the first branch and the second branch. At the same time, the branch switching component K1 is also directly connected to the external energy input terminal. By switching its own working state, it changes the current connection mode of the energy storage system control circuit and also changes the actual role played by the electric energy input from the energy input terminal in the energy storage system control circuit.

[0051] The working state of the on-off switching component 101 is also controlled by the control component 103, and its function is to control the on-off of the auxiliary power supply component 102 in the first branch by switching its own working state. In some embodiments, the control component 103 can control the on-off switching component 101 to be in the on state or the off state by controlling the working level of the on-off switching component 101 itself. When the on-off switching component 101 is in the on state, the first branch is turned on as a whole, and when the on-off switching component 101 is in the off state, the first branch is turned off as a whole.

[0052] The auxiliary power supply component 102 is an auxiliary power supply in the energy storage system where the above-mentioned energy storage system control circuit is located. Its main function is to provide auxiliary power supply for various functional modules in the energy storage system. At the same time, when the energy storage system is awakened from a low power consumption state / standby state, the auxiliary power supply component 102 can perform self-startup in response to the external energy input from the energy input end, and power each component in the energy storage system control circuit to support each component to wake up from a low power consumption state / standby state and resume normal working state.

[0053] The control component 103 mainly controls the working status of each component in the energy storage system. The control component 103 can generally be a device such as an MCU that has functions such as parameter acquisition, instruction generation and transmission.

[0054] In some embodiments, the branch switching component K1 has a first working state and a second working state;

[0055] In the first working state, the energy storage system control circuit is connected in a first branch;

[0056] In the second working state, the connection mode of the energy storage system control circuit is the second branch.

[0057] Further, the branch switching component K1 is a magnetic latching relay, which includes two groups of input pins and four groups of output pins;

[0058] When the first input pin is connected to the first output pin, and the second input pin is connected to the second output pin, the connection mode of the energy storage system control circuit is the first branch;

[0059] When the first input pin is connected to the third output pin, and the second input pin is connected to the fourth output pin, the connection mode of the energy storage system control circuit is the second branch.

[0060] Specifically, in order to concisely implement the switching of the connection mode of the energy storage system control circuit, in some examples, the above-mentioned branch switching component K1 generally includes two working states, and each working state corresponds to a connection mode of the energy storage system control circuit. For example, when the current working state of the branch switching component K1 is the first working state and the energy input terminal is connected to the first branch, the connection mode of the energy storage system control circuit is generally expressed as the first branch, and the first branch can be connected to the external electric energy introduced by the energy input terminal. For another example, when the current working state of the branch switching component K1 is the second working state, the energy input terminal is connected to the second branch, and the connection mode of the energy storage system control circuit is generally expressed as the second branch, and the second branch can be connected to the external electric energy introduced by the energy input terminal.

[0061] Further, in order to be able to make the above switch, please refer to Figure 1 The branch switching component K1 can be expressed as a set of magnetic latching relays. The magnetic latching relays include two sets of input pins and four sets of output pins. Please refer to Figure 1 , wherein the input pin is connected to the energy input end, and the output pin is respectively directed to the first branch and the second branch through the setting of the connection point.

[0062] Specifically, in Figure 1 In the example, if the No. 1 pin (corresponding to the first input pin) and the No. 3 pin (corresponding to the first output pin) of the branch switching component K1 are turned on, and the No. 4 pin (corresponding to the second input pin) and the No. 6 pin (corresponding to the second output pin) are turned on, the branch switching component K1 is connected to the on-off switching component 101 and the auxiliary power supply component 102 to form a first branch, and external energy is introduced from the energy input end to the first branch. In other examples, Figure 1 In the embodiment, if pin 1 and pin 2 (corresponding to the third output pin) of the branch switching component K1 are turned on, and pin 4 and pin 5 (corresponding to the fourth output pin) are turned on, the branch switching component K1 is directly connected to the auxiliary power supply component 102 to form a second branch, and external energy is introduced into the second branch from the energy input end.

[0063] In addition, in some examples, for the purpose of simplifying the circuit, the branch switching component K1 can also be configured as a pair of single-pole double-throw switches. Figure 1 Pins 1, 2, and 3 in the circuit belong to the same group of single-pole double-throw switches. Figure 1Pins 4, 5, and 6 belong to another set of single-pole double-throw switches.

[0064] When the above-mentioned magnetic latching relay or single-pole double-throw switch detects that the working level switches between high and low levels, it will change its conduction mode along with the level conversion. For example, when the working level is low, pins 1 and 2 are connected, and pins 4 and 5 are connected. When the working level is converted to a high level, pin 1 switches to conduction with pin 3, and pin 4 switches to conduction with pin 6.

[0065] In certain embodiments, the circuit further includes a first drive component 104 , which is powered by an auxiliary power supply component 102 ;

[0066] The first driving component 104 is configured to be controlled by the control component 103 to control the branch switching component K1 to switch to the first working state or the second working state.

[0067] Specifically, in order to enable the branch switching component K1 to accurately switch its own working state according to the control instruction of the control component 103, in some examples, the energy storage system control circuit is provided with a first drive component 104, whose function is to be controlled by the control component 103 to switch the working level for the branch switching component K1, so as to control the branch switching component K1 to change its own working state. In order to achieve the above purpose, the first drive component 104 is connected to the control component 103 on the one hand to obtain the control instruction of the control component 103, and is electrically connected to the auxiliary power supply component 102 on the other hand, and the auxiliary power supply component 102 provides power supply support for the first drive component 104. As mentioned above, illustratively, the first drive component 104 can provide the corresponding working level for the branch switching component K1 according to the instruction of the control component 103. When the above working level is switched from a high level to a low level, or from a low level to a high level, the branch switching component K1 will switch its own working state according to the level change, switch the conduction mode between each input pin and each output pin, so as to realize the switching between the first branch and the second branch.

[0068] In some embodiments, the energy storage system control circuit further includes a starting component 105;

[0069] The starting component 105 is configured to be controlled by the control component 103 to switch the working state of the on-off switching component 101 to control the on-off of the auxiliary power supply component 102.

[0070] Specifically, in order to facilitate the user to control the energy storage system as a whole and the operating state of each component in the energy storage system control circuit, illustratively, the above-mentioned energy storage system control circuit is also provided with a starting component 105. Generally, the above-mentioned starting component 105 includes components such as a button switch circuit and a signal feedback circuit. The main function is to provide a control platform for the user. When the user performs operations on the starting module through devices such as a button switch and a toggle switch, the energy storage system as a whole or the energy storage system control circuit will perform power-on startup, power-off shutdown, enter a low power consumption state / standby state and other actions according to the preset connection relationship. In addition, the starting unit can also form a circuit together with the on-off switching component 101 and the control component 103. When the starting unit is in the off state, the on-off switching component 101 will also be turned off. At this time, the control component 103 cannot control the on-off switching component 101 to switch the working state by adjusting the working level.

[0071] In some embodiments, the on-off switching component 101 is a PMOS, an NMOS, or a relay, and the operating level of the on-off switching component 101 is controlled by the control component 103 .

[0072] Specifically, the on-off switching component 101 is generally composed of semiconductor devices such as PMOS, NMOS or relays that have an on-off switching function and can realize the opening and closing of the auxiliary power supply component 102. Taking the electromagnetic relay as an example, the control component 103 controls the connection and disconnection of the relay itself by controlling the working level in the control part coil of the relay. Taking PMOS or NMOS as an example, the control component 103 controls the conduction and cutoff of the PMOS by controlling the voltage of the PMOS or NMOS gate.

[0073] In certain embodiments, the circuit further includes a second drive component 106 , which is powered by the auxiliary power component 102 ;

[0074] The second driving component 106 is configured to be controlled by the control component 103 to drive the on-off switching component 101 to convert the working level.

[0075] Specifically, in order to enable the on-off switching component 101 to accurately switch its own working state according to the control instruction of the control component 103, in some examples, the energy storage system control circuit is provided with a second drive component 106, which is controlled by the control component 103 to switch the working level for the on-off switching component 101, so as to control the on-off switching component 101 to change its own working state. In order to achieve the above purpose, the second drive component 106 is connected to the control component 103 on the one hand to obtain the control instruction of the control component 103, and is electrically connected to the auxiliary power supply component 102 on the other hand, and the auxiliary power supply component 102 provides power supply support for the second drive component 106. As mentioned above, illustratively, the second drive component 106 can provide the corresponding working level for the on-off switching component 101 according to the instruction of the control component 103. When the above working level is switched from a high level to a low level, or from a low level to a high level, the on-off switching component 101 will switch its own working state according to the level change, and control the on and off of the auxiliary power supply component 102 in the energy storage system control circuit through its current on state or off state.

[0076] In certain embodiments, the circuit further includes a plurality of input diodes configured to provide a photovoltaic input and / or a battery input to the energy storage system control circuit.

[0077] Furthermore, in some embodiments, the circuit further includes a plurality of input diodes, wherein the first input diode D1 is connected to the first input pin, the second input diode D2 is connected to the second input pin, and the third input diode D3 is directly connected to the on-off switching component 101 .

[0078] Specifically, as mentioned above, the energy storage system control circuit introduces energy from the outside by connecting the branch switching component K1 to the energy input terminal. For example, when the above energy storage system is a photovoltaic energy storage system, the energy input terminal is divided into two parts: photovoltaic input and battery input. The photovoltaic input is the electric energy generated by the photovoltaic components in the energy storage system under light conditions. The above photovoltaic electric energy is introduced into the energy storage system control circuit through the above energy input terminal, and the battery input is the electric energy released by the energy storage battery in the energy storage system. The above electric energy is also introduced into the energy storage system control circuit through the above energy input terminal. In order to control the stability of the overall operation of the circuit and avoid the error of electric energy being output from the energy input terminal during the switching of the working state, for example, multiple input diodes are set at the energy input terminal, and each input diode corresponds to an energy input branch. In this way, the correctness and reliability of the circuit operation can be ensured by using the unidirectional conductivity of the diode.

[0079] Further, in Figure 1In the example shown, the energy input end is divided into three energy input branches, one of which introduces battery energy and the remaining two introduce photovoltaic energy. Each energy input branch is provided with an input diode, and the conduction direction is from the external circuit to the auxiliary power supply component 102. Please refer to Figure 1 , the first input diode D1D1 corresponds to the first photovoltaic energy, and its cathode is connected to pin 1 (corresponding to the first input pin) of the branch switching component K1. The second input diode D2D2 corresponds to the second photovoltaic energy, and its cathode is connected to pin 4 (corresponding to the second input pin) of the branch switching component K1. The third input diode D3D3 corresponds to battery energy, and in particular, its cathode is directly connected between the branch switching component K1 on the first branch and the on-off switching component 101. In this way, in addition to ensuring the correctness and reliability of the circuit operation, the above three input diodes can also aggregate the photovoltaic input and the battery input into one branch output. When any branch has no input energy, the other branches can still provide electrical energy input normally, thereby avoiding conflicts between the electrical energy inputs of various branches at the energy input end.

[0080] In this way, the energy storage system control circuit in the embodiment of the present application can realize the state switching of whether the on-off switching component 101 is connected to the control circuit by setting the branch switching component K1, so as to realize the on-off control of the auxiliary power supply process when the on-off switching component 101 is connected to the control circuit, and at night when the power of the photovoltaic energy storage battery is low, the on-off switching component 101 is disconnected from the control circuit, so that when the lighting conditions are met again, the auxiliary power supply can directly accept the photovoltaic input for self-starting and charge the energy storage battery. At the same time, it can also automatically drive the branch switching component K1 to switch the state of the energy storage system control circuit when the power of the energy storage battery reaches the requirement, and control the on-off switching component 101 to connect to the control circuit again, thereby reducing the standby loss of the system while ensuring the function of the energy storage system and maximizing the utilization of photovoltaic energy.

[0081] See also Figure 2 The energy storage system control method in the embodiment of the present application is implemented based on the above energy storage system control circuit, and the above method includes the following steps:

[0082] 01: In response to the power-on operation performed by the user in the start-up component 105, the second driving component 106 is controlled to change the working level of the on-off switching component 101 to control the on-off switching component 101 to be turned on;

[0083] 02: When it is detected that the energy storage system is not currently being charged, the state of charge of the battery in the energy storage system is detected;

[0084] 03A: When the state of charge meets the first condition, the control system enters a low power consumption state and detects the state of charge of the battery in the energy storage system;

[0085] 04A: When the state of charge satisfies the second condition, the first drive component 104 is controlled to switch the working state of the branch switching component K1, so that the connection mode of the energy storage system control circuit is switched to the second branch;

[0086] 05: Control the second driving component 106 to change the working level of the on-off switching component 101 to control the on-off switching component 101 to be cut off;

[0087] 06: When it is detected that the photovoltaic input voltage is greater than the starting voltage of the auxiliary power supply assembly 102, in response to the automatic starting of the auxiliary power supply, the state of charge of the battery is obtained during the charging process of the battery;

[0088] 07A: When the charge state satisfies the third condition, the second driving component 106 is controlled to change the working level of the on-off switching component 101 to control the on-off switching component 101 to be turned on;

[0089] 08: Control the working state of the first drive component 104 to switch the branch switching component K1, so that the connection mode of the energy storage system control circuit is switched to the first branch.

[0090] Specifically, the actual application process of the above energy storage system control circuit is described below. It should be noted in advance that the default working state of the branch switching component K1 is that pin 1 is turned on with pin 3, and pin 4 is turned on with pin 6. Then in the above default state, first, the user starts the entire energy storage system or the entire energy storage system control circuit by operating the switch device such as the button switch, toggle switch, etc. on the starting component 105. After the control component 103 detects the button operation on the starting component 105, it sends a control instruction to the second drive component 106. The second drive component 106 is controlled by the above control instruction to change the working level of the on-off switching component 101 and switch the on-off switching component 101 to the on state. At this time, the system enters a normal working state.

[0091] During the normal operation of the system, it is determined whether the energy storage system is currently in a charging state. If not, it means that the energy storage system is currently in a discharging or standby state. At this time, based on the application scenarios of the discharging state and the standby state, the state of charge (hereinafter referred to as SOC) of the battery in the energy storage system is detected. When it is detected that the battery SOC is lower than the preset battery discharge critical threshold of the energy storage system (corresponding to the state of charge meeting the first condition), the energy storage system will prevent the battery from continuing to discharge, and the energy storage system will enter a low-power mode to extend the standby time of the system, and further monitor the battery SOC.

[0092] If further detection on this basis finds that the battery's SOC is lower than the preset low battery protection threshold of the energy storage system (corresponding to the state of charge satisfying the second condition), in order to protect the battery, it is necessary to cut off all power consumption related to the battery. Therefore, in this case, the control component 103 first sends a control instruction to the first drive component 104, so that the first drive component 104 changes the working level of the branch switching component K1, switches the working mode of the branch switching component K1, and switches the pin connected to pin 1 from pin 3 to pin 2, and switches the pin connected to pin 4 from pin 6 to pin 5, thereby switching the overall connection mode of the energy storage system control circuit from the first branch to the second branch. On this basis, the control component 103 sends a control instruction to the second drive component 106, so that the second drive component 106 changes the working level of the on-off switching component 101, so that the on-off switching component 101 is turned off. After the above circuit state switching, on the one hand, the battery input can be stopped from continuing to discharge to the energy storage system control circuit by changing the connection mode and turning off the on-off switching component 101, and on the other hand, the photovoltaic input is directly connected to the auxiliary power component 102, so that the auxiliary power component 102 responds to the photovoltaic input. After the auxiliary power component 102 is automatically started, it starts to supply power to each functional module in the energy storage system, and the energy storage system begins to recover to the working state.

[0093] Next, when the auxiliary power component 102 is directly connected to the photovoltaic input through the second branch, the auxiliary power component 102 will always monitor the voltage on the photovoltaic input side. When it is detected that the photovoltaic input voltage is greater than or equal to the starting voltage of the auxiliary power component 102, the auxiliary power component 102 will start automatically in response to the above voltage condition. It should be additionally explained that when it is detected that the photovoltaic input voltage is still less than the starting voltage of the auxiliary power component 102, the above detection process for measuring the photovoltaic input voltage is maintained.

[0094] In the case where the auxiliary power supply component 102 is self-started, the energy storage system is reawakened, and the photovoltaic components in the energy storage system can automatically charge the battery at this time. The SOC of the battery will increase with the charging process, and the SOC of the battery in the energy storage system is continuously detected during this process. When the SOC of the battery is greater than the preset working state recovery threshold of the energy storage system (corresponding to the state of charge satisfying the third condition), the control component 103 sends a control instruction to the second drive component 106, and the second drive component 106 is controlled by the above control instruction to change the working level of the on-off switching component 101 and switch the on-off switching component 101 to the on state again. At the same time, the control component 103 sends a control instruction to the first drive component 104, and the first drive component 104 is controlled by the above control instruction to change the working level of the branch switching component K1 and switch the working mode of the branch switching component K1, so as to switch the pin connected to pin 1 from pin 2 to pin 3, and switch the pin connected to pin 4 from pin 5 to pin 6, so as to switch the overall connection mode of the energy storage system control circuit from the second branch back to the first branch, and the system returns to normal working state.

[0095] Please refer again Figure 2 In some embodiments, the energy storage system control method further includes:

[0096] 03B: When the state of charge does not satisfy the first condition, the state of charge of the battery in the energy storage system is detected.

[0097] In some embodiments, the energy storage system control method further includes:

[0098] 04B: When the state of charge does not satisfy the second condition, maintain the low power consumption state and detect the state of charge of the battery in the energy storage system.

[0099] In some embodiments, the energy storage system control method further includes:

[0100] 07B: When the state of charge does not satisfy the third condition, the charging process is maintained and the state of charge of the battery is obtained.

[0101] Specifically, on the basis of the above-mentioned energy storage system control method, illustratively, when it is determined that the current energy storage system is not in a charging state, the state of charge (hereinafter referred to as SOC) of the battery in the energy storage system is detected in real time. In addition to the situation in the above-mentioned embodiment where the SOC of the battery is lower than the critical discharge threshold of the battery preset by the energy storage system, it is also possible to detect that the SOC of the battery is equal to or higher than the critical discharge threshold of the battery preset by the energy storage system (corresponding to the state of charge not satisfying the first condition). At this time, it means that the current SOC of the battery can still continue to support the discharge of the battery, and there is no need to adjust the control circuit. Therefore, at this time, except for continuing to monitor the SOC of the current battery, no other action is taken to maintain the working state of the battery during discharge or standby. Once it is detected that the SOC of the current battery is lower than the critical discharge threshold of the battery preset by the energy storage system, the method given in the above-mentioned embodiment is executed.

[0102] In other examples, when it is detected that the SOC of the battery is lower than the critical battery discharge threshold preset by the energy storage system, the energy storage system will first prevent the battery from continuing to discharge, and the control system will enter the low power mode and continue to detect and judge the battery power. In addition to the situation in the above implementation that the SOC of the battery is lower than the low battery protection threshold preset by the energy storage system, it is also possible to detect that the SOC of the battery is higher than or equal to the low battery protection threshold preset by the energy storage system (corresponding to the state of charge not satisfying the second condition). At this time, it means that the SOC of the battery can continue to maintain the energy storage system in low power mode. Therefore, at this time, in addition to continuing to maintain the energy storage system in low power mode, the SOC of the battery continues to be detected. Once it is detected that the SOC of the current battery is lower than the low battery protection threshold preset by the energy storage system, the method given in the above implementation is executed.

[0103] In other examples, after the auxiliary power supply component 102 is self-started in response to the input of photovoltaic energy, the energy storage system begins to recover the working state. At this time, the photovoltaic energy can charge the battery, and the SOC of the battery increases with the charging process. In addition to the case where the SOC of the battery is detected to be greater than the preset working state recovery threshold of the energy storage system in the above embodiment, it is also possible to detect that the SOC of the battery is less than or equal to the preset working state recovery threshold of the energy storage system (corresponding to the state of charge not satisfying the third condition). This situation indicates that the battery has not yet been fully charged and its SOC is not sufficient to support the energy storage system to fully recover the working state. Therefore, at this time, the process of charging the battery with photovoltaic energy is maintained, and the SOC of the battery is detected in real time. Once it is detected that the SOC of the battery is greater than the preset working state recovery threshold of the energy storage system, it is executed according to the method given in the above embodiment.

[0104] The energy storage system in the implementation manner of the present application includes the above-mentioned energy storage system control circuit and can implement the above-mentioned energy storage system control method.

[0105] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0106] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0107] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An energy storage system control circuit, characterized in that: The circuit includes a branch switching component, an on-off switching component, an auxiliary power supply component and a control component, wherein the branch switching component and the auxiliary power supply component constitute a first branch, and the branch switching component, the on-off switching component and the auxiliary power supply component constitute a second branch; The control component is configured to control the branch switching component to switch the working state so that the connection mode of the energy storage system control circuit is switched between the first branch and the second branch; The control component is also configured to control the on-off switching component to switch the working state so as to control the on-off of the auxiliary power supply component.

2. The circuit according to claim 1, characterized in that The branch switching component has a first working state and a second working state; In the first working state, the energy storage system control circuit is connected in the first branch; In the second working state, the energy storage system control circuit is connected in the second branch.

3. The circuit according to claim 1, characterized in that The branch switching component is a magnetic latching relay, which includes two groups of input pins and four groups of output pins; When the first input pin is connected to the first output pin, and the second input pin is connected to the second output pin, the energy storage system control circuit is connected in the first branch; When the first input pin is connected to the third output pin, and the second input pin is connected to the fourth output pin, the energy storage system control circuit is connected in the second branch.

4. The circuit according to claim 2, characterized in that The circuit further includes a first drive component, the first drive component being powered by the auxiliary power supply component; The first driving component is configured to be controlled by the control component to control the branch switching component to switch to the first working state or to switch to the second working state.

5. The circuit according to claim 1, characterized in that The circuit also includes a startup component; The starting component is configured to be controlled by the control component to switch the working state of the on-off switching component to control the on-off of the auxiliary power supply component.

6. The circuit according to claim 1, characterized in that The on-off switching component is a PMOS, an NMOS or a relay, and the working level of the on-off switching component is controlled by the control component.

7. The circuit according to claim 6, characterized in that The circuit further includes a second drive component, the second drive component being powered by the auxiliary power supply component; The second driving component is configured to be controlled by the control component to drive the on-off switching component to convert its working level.

8. The circuit according to claim 1, characterized in that The circuit also includes a plurality of input diodes configured to provide a photovoltaic input and / or a battery input to the energy storage system control circuit.

9. The circuit according to claim 3, characterized in that The circuit further comprises a plurality of input diodes, wherein a first input diode is connected to the first input pin, a second input diode is connected to the second input pin, and a third input diode is directly connected to the on-off switching component.

10. A method for controlling an energy storage system, characterized in that: The energy storage system control method is implemented based on the energy storage system control circuit according to any one of claims 1 to 9, and the method includes: In response to a power-on operation performed by a user on the startup component, controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be turned on; When it is detected that the energy storage system is not currently being charged, detecting a state of charge of a battery in the energy storage system; When the state of charge satisfies a first condition, controlling the system to enter a low power consumption state and detecting the state of charge of a battery in the energy storage system; When the state of charge satisfies a second condition, controlling the first drive component to switch the working state of the branch switching component so that the connection mode of the energy storage system control circuit is switched to the second branch; Controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be cut off; acquiring the state of charge of the battery during the charging process of the battery in response to automatic start-up of the auxiliary power supply in the event that the photovoltaic input voltage is detected to be greater than the start-up voltage of the auxiliary power supply assembly; When the state of charge satisfies a third condition, controlling the second driving component to change the working level of the on-off switching component to control the on-off switching component to be turned on; Control the working state of the first drive component switching branch switching component to switch the connection mode of the energy storage system control circuit to the first branch.

11. The control method according to claim 10, characterized in that: The method further comprises: When the state of charge does not satisfy the first condition, the state of charge of the battery in the energy storage system is detected.

12. The control method according to claim 10, characterized in that: The method further comprises: When the state of charge does not satisfy the second condition, the low power consumption state is maintained and the state of charge of the battery in the energy storage system is detected.

13. The control method according to claim 10, characterized in that: The method further comprises: When the state of charge does not satisfy a third condition, the charging process is maintained and the state of charge of the battery is acquired.

14. An energy storage system, characterized in that: The energy storage system comprises the energy storage system control circuit as described in any one of claims 1-9; the energy storage system can implement the energy storage system control method as described in any one of claims 10-13.

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