Start-stop control device and electric power system

Abstract

The utility model provides a start-stop control device and a power system. The start-stop control device comprises a power supply module, a current acquisition module and a switch module. The current acquisition module is used for detecting the charging current of the photovoltaic charging module; the switch module is used for being connected between the battery module and the photovoltaic charging module so as to conduct an electric connection path between the battery module and the photovoltaic charging module in a conducting state and disconnect the electric connection path between the battery module and the photovoltaic charging module in a disconnecting state. The controller receives the charging current through a connection path between the controller and the current acquisition module and transmits an electric signal through a connection path between the controller and the switch module when the charging current is lower than a current threshold value, and the switch module is switched on under the action of the electric signal. According to the invention, more flexible charging start-stop control can be realized, so that the photovoltaic charging module can charge the battery module in a manner of meeting the charging demand of the battery module.

Description

Technical Field

[0001] This application relates to the field of battery control technology, and in particular to a start-stop control device and a power system. Background Technology

[0002] Photovoltaic charging modules can connect to batteries to charge them. In related technologies, the electrical connection between the battery and the photovoltaic charging module is normally conductive, allowing the photovoltaic charging module to continuously charge the battery. However, this design of continuously charging the battery with the photovoltaic charging module may not meet the battery's charging needs in certain scenarios. Utility Model Content

[0003] One objective of this application is to provide a start / stop control device and a power system.

[0004] Firstly, a start-stop control device is provided. The start-stop control device includes:

[0005] Power supply module;

[0006] A current acquisition module is connected to the battery module and the photovoltaic charging module, and the current acquisition module is used to detect the charging current of the photovoltaic charging module.

[0007] A switch module is connected to the power supply module to receive power from the power supply module. The switch module is also used to connect between the battery module and the photovoltaic charging module to conduct the electrical connection path between the battery module and the photovoltaic charging module in the on state and to disconnect the electrical connection path between the battery module and the photovoltaic charging module in the off state.

[0008] The controller is connected to the power supply module to receive power from the power supply module. The controller is also connected to the switch module and the current acquisition module. The controller receives the charging current through its connection path with the current acquisition module, and transmits an electrical signal through its connection path with the switch module when the charging current is lower than the current threshold. The switch module is turned on under the action of the electrical signal.

[0009] Thirdly, a power system is provided, which includes a battery module, a photovoltaic charging module, and the start-stop control device described in the first aspect.

[0010] In the aforementioned start-stop control device and power system solution, a start-stop control device is connected between the battery module and the photovoltaic charging module. This device includes a switch module used to connect or disconnect the electrical connection between the battery module and the photovoltaic charging module. The controller can control the switch module to connect or disconnect when the charging current is low, thereby achieving more flexible charging start-stop control and enabling the photovoltaic charging module to charge the battery module in a manner that meets its charging needs. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the framework of a power system according to one embodiment of this application;

[0013] Figure 2 This is a schematic diagram of the electrical connections of a power system according to an embodiment of this application;

[0014] Figure 3 This is a circuit diagram of a start-stop control device according to one embodiment of the application;

[0015] Figure 4 This is a circuit diagram of a battery module according to one embodiment of this application;

[0016] Figure 5 This is a circuit diagram of a first switch control circuit according to an embodiment of this application;

[0017] Figure 6 This is a circuit diagram of a second switch control circuit according to one embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0019] It should be noted that, unless there is a conflict, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. In addition, the terms "first," "second," and "third" used in this application do not limit the data or execution order, but only distinguish the same or similar items with essentially the same function and effect.

[0020] The present application will now be described in detail through specific embodiments.

[0021] Please see Figure 1 , Figure 1 This is a schematic diagram of the framework of a power system 10 provided in an embodiment of this application. The power system 10 can be applied to fields such as home energy storage, vehicles, and ships, and this application does not limit its application. The power system 10 includes a battery module 20, a photovoltaic charging module 30, and a start-stop control device 40.

[0022] In this regard, please combine Figure 1 and Figure 4 The battery module 20 is a component for storing electrical energy, typically comprising several battery cells, which can be lithium-ion batteries, nickel-metal hydride batteries, or other types of batteries. The battery module 20 can store electrical energy supplied by a photovoltaic charging module or other energy sources (such as generators, mains power, etc.) and release this electrical energy when needed to power the loads in the power system 10. The battery module 20 may further include a Battery Management System (BMS). The BMS is connected to the battery cells and can perform charge and discharge management of the battery cells, as well as monitor the operating parameters of the battery cells to promptly disconnect the battery's charge / discharge circuit in case of battery cell malfunction (e.g., ...). Figure 4 It includes a high-voltage circuit containing a main positive relay and a main negative relay to protect the safety of the battery module 20 or the downstream load.

[0023] The photovoltaic charging module 30 converts solar energy into electrical energy to charge the battery module 20. Photovoltaic charging is a clean and efficient charging method that helps reduce dependence on traditional energy sources.

[0024] The start-stop control device 40 is connected between the battery module 20 and the photovoltaic charging module 30. The start-stop control device 40 is used to connect or disconnect the electrical connection between the battery module 20 and the photovoltaic charging module 30.

[0025] Please see Figure 2 , Figure 2This is a schematic diagram showing the connections of the modules in the power system 10 provided in this embodiment. The start / stop control device 40 includes a controller 42 and a switch module 41. The controller 42 is connected to the switch module 41, which is connected between the battery module 20 and the photovoltaic charging module 30. The controller 42 is used to control the operation of the switch module 41. Specifically, the controller 42 can control the switch module 41 to operate in a conducting state (e.g., sending an electrical signal to the switch module 41 through its connection path, causing the switch module 41 to conduct under the action of the electrical signal), thereby establishing the electrical connection between the battery module 20 and the photovoltaic charging module 30, so that the photovoltaic charging module 30 charges the battery module 20; the controller 42 can also control the switch module 41 to operate in a disconnected state (e.g., stopping the sending of electrical signals), thereby disconnecting the electrical connection between the battery module 20 and the photovoltaic charging module 30, thus stopping the photovoltaic charging module 30 from charging the battery module 20.

[0026] In one possible example, please see Figure 3 , Figure 3 This is a circuit diagram of the start / stop control device 40. The start / stop control device 40 also includes a power supply module 43, a key detection module 44, a switch control module 45, a current acquisition module 46, a communication module 47, and an indicator light module 48.

[0027] The power supply module 43 is connected to the controller 42, the button detection module 44, the switch module 41, and the switch control module 45 to supply power to these modules, thereby ensuring that they can operate. The power supply module 43 can also be connected to the battery module 20 to receive power from the battery module 20.

[0028] As an example, please combine Figure 3 The power supply module 43 may include a first DC-DC circuit 431, a charging management circuit 432, and a battery 433. The input terminal of the first DC-DC circuit 431 is connected to the positive output (P+) of the battery module 20. The output terminal of the first DC-DC circuit 431 is connected to the input terminal of the charging management circuit 432. The output terminal of the charging management circuit 432 is connected to the input terminal of the battery 433. The output terminal of the battery 433 is connected to the controller 42.

[0029] The first DC-DC circuit 431 is a DC-DC converter used to convert direct current (DC) from one voltage level to another. In the power supply module 43, the input of the first DC-DC circuit 431 is connected to the battery module 20, and its function is to convert the electrical energy output from the battery module 20 into a stable voltage suitable for use by other components in the start-stop control device 40. Through the first DC-DC circuit 431, voltage stabilization and regulation can be achieved, ensuring that subsequent circuits can obtain a stable power supply voltage.

[0030] The charging management circuit 432 is responsible for managing the charging process of the battery 433. It receives the output from the first DC-DC circuit 431 and ensures that the battery 433 is charged under safe voltage and current to prevent overcharging and overheating. The charging management circuit 432 typically has functions such as overvoltage protection, overcurrent protection, and temperature monitoring to ensure the long-term stable operation of the battery 433.

[0031] The storage battery 433 is a rechargeable and dischargeable battery that serves as an energy storage unit in the power supply module 43. The input terminal of the storage battery 433 is connected to the output terminal of the charging management circuit 432, receiving electrical energy from the charging management circuit 432 for charging. When an external power source (such as battery module 20) is unavailable, the storage battery 433 can provide backup power to ensure continuous system operation.

[0032] Specifically, battery module 20 provides electrical energy, which is converted into voltage by the first DC-DC circuit 431. The converted electrical energy is then sent to charging management circuit 432. Charging management circuit 432 optimizes the electrical energy, and the processed electrical energy is used to charge battery 433. The output terminal of battery 433 is connected to controller 42 to provide necessary power to controller 42 and other modules connected to controller 42 (such as key detection module 44, switch control module 45, etc.).

[0033] In this embodiment, the power supply module 43 carries its own battery 433 and can also be connected to the battery module 20 to receive power from the battery module 20. This dual power supply method ensures that the power supply module 43 can provide stable power to the back-end electrical components such as the control unit, which is beneficial to improving the stability and reliability of the start-stop control device 40. In addition, since the battery module 20 can supply power to the start-stop control device 40, when the start-stop control device 40 is off, if the high-voltage circuit of the battery module 20 is energized, the start-stop control device 40 can also receive power and start up. That is, the battery module 20 can trigger the start-stop control device 40 to start up. At this time, the user does not need to press the power on / off button of the battery module 20 and the power on / off button of the start-stop control device 40 separately, making the user's operation more convenient.

[0034] As an example, please combine with Figure 3 The power supply module 43 may further include a second DC-DC circuit 435. The input terminal of the second DC-DC circuit 435 is connected to the output terminal of the battery 433, and the output terminal of the second DC-DC circuit 435 is connected to the controller 42. The second DC-DC circuit 435 is used to convert the electrical energy output from the battery 433 into a voltage suitable for the operation of the controller 42. This ensures that the controller 42 receives a suitable and stable operating voltage.

[0035] As an example, please combine with Figure 3 The power supply module 43 may also include a battery protection circuit 434. The input terminal of the battery protection circuit 434 is connected to the output terminal of the battery 433, and the output terminal of the battery protection circuit 434 is connected to the input terminal of the second DC-DC circuit 435. The battery protection circuit 434 is mainly used to protect the battery 433, preventing damage to the battery 433 under abnormal conditions such as overcharging, over-discharging, and overcurrent, thereby ensuring that the battery 433 operates within a safe operating range and extending its service life.

[0036] As an example, please combine with Figure 3 The power supply module 43 may further include an isolation DC-DC circuit 436. The input terminal of the isolation DC-DC circuit 436 is connected to the output terminal of the first DC-DC circuit 431, and the output terminal of the isolation DC-DC circuit 436 is connected to the switch module 41. The isolation DC-DC circuit 436 is a DC-DC converter with electrical isolation function. It provides electrical isolation between different circuits to prevent noise interference and potential electric shock hazards. In the power supply module 43, the input terminal of the isolation DC-DC circuit 436 is connected to the output terminal of the first DC-DC circuit 431, and its output terminal is connected to the switch module 41. This ensures that the switch module 41 does not introduce noise or cause a short circuit when operating the electrical connection between the battery module 20 and the photovoltaic charging module 30.

[0037] The button detection module 44 is connected to the controller 42. The button detection module 44 detects user input commands, such as power on, power off, or mode switching. When the user presses a button, the button detection module 44 transmits a signal to the controller 42, which then adjusts the operating state of components such as the switch module 41 based on these signals.

[0038] As an example, the button detection module 44 includes a power on / off detection circuit 441 and a mode switching detection circuit 442.

[0039] The power-on / off detection circuit 441 is used for power-on / off detection of the start / stop control device 40 itself. Specifically, one end of the power-on / off detection circuit 441 is connected to the power supply module 43 to obtain the electrical energy required for operation; the other end of the power-on / off detection circuit 441 is connected to the controller 42 to transmit the signal generated by the power-on / off button operation to the controller 42. When the user presses the power-on / off button, the circuit generates a signal. After receiving this signal, the controller 42 executes the power-on / off operation of the start / stop control device 40, which may be to start or stop the entire start / stop control device. By setting the power-on / off detection circuit 441 to detect the user's power-on / off operation and transmitting the signal to the controller 42, this embodiment of the application can ensure that the start / stop control device 40 can accurately respond to the user's power-on / off commands.

[0040] The mode switching detection circuit 442 is used for mode switching detection of the start / stop control device 40. Specifically, one end of the mode switching detection circuit 442 is connected to the power supply module 43 to obtain the electrical energy required for operation; the other end of the mode switching detection circuit 442 is connected to the controller 42 to transmit a mode switching signal to the controller 42. Different modes may include, but are not limited to, a first operating mode (also known as a normally closed mode), a second operating mode (also known as a standby charging mode), and a third operating mode (also known as a standby discharging mode). Specifically, in the normally closed mode, the start / stop control device 40 remains closed unless the SOC of the battery module 20 reaches a specific threshold. In the standby charging mode, the start / stop control device 40 determines when to start or stop charging based on the SOC of the battery module 20 and the power supply capacity of the photovoltaic charging module 30. In the standby discharging mode, the start / stop control device 40 manages the discharge of the battery module 20 according to a set timer to supply the load (such as a water pump; in marine power systems, water pumps need to be turned on periodically to drain water to avoid shipwrecks caused by water accumulation in the hull). The standby discharge mode can include multiple sub-modes. When the user presses the mode switch button, the circuit detects this action and sends a corresponding signal to the controller 42. Based on the received signal, the controller 42 can adjust the operating mode of the start / stop control device to adapt to the usage requirements of the battery module 20 in various scenarios. This embodiment detects the user's mode switch operation by setting a mode switch detection circuit 442 and transmits the signal to the controller 42. The controller 42 flexibly executes control strategies corresponding to various modes based on this signal, thereby meeting the usage requirements of the battery module 20 in various scenarios.

[0041] Optionally, when the user operates the power on / off button in the power on / off detection circuit 441 to power on the start / stop control device 40, the start / stop control device 40 operates in the first operating mode by default. During the operation of the start / stop control device 40, the user can operate the mode switching button in the mode switching detection circuit 442 to switch modes.

[0042] Optionally, key presses may generate bounce signals (i.e., the key is repeatedly pressed and released within a short period of time), which may lead to false triggering of control signals. Therefore, the start / stop control device 40 may further include a key debounce circuit (such as an RC filter) to filter out these bounce signals and ensure that the detected key signals are stable. In addition, a software debounce algorithm (implemented in the controller 42) can be added to filter out these bounce signals.

[0043] The switch controller 42 is used to control the switching state of the low-voltage circuit (the electrical connection path between the battery cell and the BMS) of the battery module 20. Specifically, the switch control module 45 is connected to the controller 42 to receive instructions from the controller 42. The switch control module 45 can also be connected to the battery module 20 to turn on or off the electrical connection path between the battery cell and the BMS according to the instructions of the controller 42, thereby changing the operating state of the battery module 20.

[0044] The current acquisition module 46 is used to monitor the charging current of the photovoltaic charging module 30. Specifically, the current acquisition module 46 includes a current acquisition circuit 461 and a sampling resistor. The current acquisition circuit 461 is connected to the controller 42, and the sampling resistor is connected between the battery module 20 and the photovoltaic charging module 30. The current acquisition circuit 461 and the sampling resistor are connected in parallel to acquire the current flowing through the sampling resistor. The current acquisition module 46 receives the charging current acquisition command sent by the controller 42 module and performs the detection of the charging current of the photovoltaic charging module 30 according to the charging current acquisition command. The current acquisition module 46 can also transmit the charging current data to the controller 42 in real time through its connection path with the controller 42, so that the controller 42 can adjust the charging strategy according to the current data to prevent the battery module 20 from being overcharged. The current acquisition module 46 is connected to both the battery module 20 and the photovoltaic charging module 30 to accurately measure the current between them.

[0045] Communication module 47 is connected between controller 42 and battery module 20 to enable communication between them. Specifically, communication module 47 can receive important information transmitted by battery module 20, such as SOC and high-voltage circuit conduction status. This communication module 47 helps controller 42 better manage and optimize the operation of the entire power system 10.

[0046] The indicator module 48 is connected to the controller 42 to display an indicator mode that matches the current operating mode of the start / stop control device 40.

[0047] The indicator light module 48 provides visual feedback. Connected to the controller 42, the controller 42 controls the indicator light module 48 to display the corresponding indicator light mode based on the current operating mode of the start-stop control device 40. The indicator light module 48 displays the current operating mode of the start-stop control device 40 by showing different colors or flashing patterns, allowing users to intuitively understand the current status and mode of the start-stop control device 40. The indicator light module 48 can also be used to indicate other device statuses, such as low battery or fault alarms.

[0048] For example, indicator module 48 consists of 7 LEDs, which are controlled by controller 42 to indicate the current status and mode of start / stop control device 40 by turning them on and off. Indicator module 48 includes 1 running indicator and 6 mode indicator:

[0049] (1) Power indicator: Indicates the on / off status of the start / stop control device 40. The power indicator is constantly lit after the start / stop control device 40 is turned on, indicating that the start / stop control device 40 has been turned on and is running. If the battery module 20 is in a non-standby state but communication with the battery module 20 is lost, the power indicator will flash to indicate that there may be a communication problem with the user's system.

[0050] (2) Status light 1: When the start-stop control device 40 enters the normally closed mode, it is always lit, indicating that the start-stop control device 40 is in the normally closed mode.

[0051] (3) Status light 2: When the start-stop control device 40 enters the standby charging mode, it is always lit, indicating that the start-stop control device 40 is in the standby charging mode.

[0052] (4) Status light 3: When the start / stop control device 40 enters standby discharge mode 1, it is always lit, indicating that the system is in the first standby discharge state.

[0053] (5) Status light 4: When the start / stop control device 40 enters standby discharge mode 2, it is always lit, indicating that the system is in the second standby discharge state.

[0054] (6) Status light 5: When the start / stop control device 40 enters standby discharge mode 3, it is always lit, indicating that the system is in the third standby discharge state.

[0055] (7) Status light 6: When the start / stop control device 40 enters standby discharge mode 4, it is always lit, indicating that the system is in the fourth standby discharge state.

[0056] Optionally, additional LEDs can be set or existing LEDs can be made to flash in specific patterns to indicate system errors or malfunctions so that users can quickly identify and take action; or, different colored LEDs can be used to indicate different states, such as red for warnings or errors, green for normal operation, and yellow for standby.

[0057] In one possible example, please refer to [link / reference]. Figure 3 The switching module 41 includes an isolation drive circuit 411 and a switching transistor. The isolation drive circuit 411 is connected to the power supply module 43 and the controller 42. The isolation drive circuit 411 is used to drive the switching transistor to work.

[0058] The isolation drive circuit 411 is connected to the output of the isolation DC-DC circuit 436 to receive power from the power supply module 43. When the isolation drive circuit 411 receives a drive command from the controller 42, it drives the switching transistor to operate, thereby turning on the switching transistor.

[0059] The switching transistors include a first switching transistor Q1 and a second switching transistor Q2. When the isolation drive circuit 411 receives a drive command from the controller 42, it drives both the first switching transistor Q1 and the second switching transistor Q2 to turn on or off, thereby controlling the connection or disconnection of the battery module 20 and the photovoltaic charging module 30, and realizing the start-stop control of photovoltaic charging.

[0060] Optionally, the switching transistors include a first switching transistor Q1 and a second switching transistor Q2. The first terminal of the first switching transistor Q1 is connected to the isolation drive circuit 411, the second terminal of the first switching transistor Q1 is connected to the second terminal of the second switching transistor Q2, and the third terminal of the first switching transistor Q1 is used to connect to the battery module 20. The first terminal of the second switching transistor Q2 is connected to the isolation drive circuit 411, and the third terminal of the second switching transistor Q2 is used to connect to the photovoltaic charging module 30. The first switching transistor Q1 and the second switching transistor Q2 can be MOSFETs, transistors, etc. Figure 3 The example uses NMOS transistors as both the first switch Q1 and the second switch Q2, but this should not be construed as a limitation of this application. In this embodiment, the second terminals of the two switches are connected back-to-back, which can prevent current backflow and improve circuit safety.

[0061] In one possible example, the switch control module 45 includes two control circuits. One control circuit is connected at one end to the controller 42, and the other end is used to connect to the power-on circuit of the battery module 20. The other control circuit is connected at one end to the controller 42, and the other end is used to connect to the power-off circuit of the battery module 20.

[0062] As an example, each control circuit includes a third switch, one end of which is connected to the controller 42 and the other end to a relay; the relay is connected to the power supply module 43 and can also be connected to the battery module 20. The third switch is used to control the operation of the relay.

[0063] For specific details, please refer to... Figure 4 and Figure 5The switch control module 45 includes a first control circuit 451. The first control circuit 451 includes a relay K1 and a third switch Q3. The first terminal of the third switch Q3 is connected to the controller 42, the second terminal of the third switch Q3 is grounded, and the third terminal of the third switch Q3 is connected to the relay K1. The two ports K1+ and K1- of the relay K1 are connected to the input and output ports of switch 1 in the power-on circuit of the battery module 20, respectively. When the battery module 20 needs to be turned on, the controller 42 pulls the level of the CTRL1 port high (in other embodiments, the level of the CTRL1 port can also be pulled low) and maintains it for a certain period of time to turn on the third switch Q3. After the third switch Q3 is turned on, the current provided by the power switch module 41 flows through the coil of the relay K1, causing the contacts of the relay K1 to close. At this time, the self-locking relay of the battery module 20 is short-circuited, the circuit between the battery unit and the voltage conversion module is completed, and the battery unit can supply power to the BMS. Thus, the power-on wake-up of the battery module 20 is achieved.

[0064] Furthermore, such as Figure 5 As shown, the switch control module 45 also includes resistors R1 and R2, capacitors C1 and C2, diode D1, and TVS diode D2. Resistor R1 is a current-limiting resistor used to limit the current at the first terminal of the third switch Q3 and suppress oscillation. Resistor R2 is a pull-down resistor used to ensure reliable switching of the third switch. Capacitors C1 and C2 are used for energy storage to ensure a stable power supply to the coil of relay K1, and for filtering. Capacitors C1 and C2 are used to filter signals of different frequency bands, thereby reducing interference and ensuring the stability and safety of relay K1 operation. Since a back electromotive force is generated when the contacts of relay K1 open, diodes D1 and D2 are provided to provide a protection circuit to protect the coil of relay K1.

[0065] Please combine Figure 4 and Figure 6The switch control module 45 includes a second control circuit 452. The second control circuit 452 includes a relay K2 and a third switch Q4. The first terminal of the third switch Q4 is connected to the controller 42, the second terminal of the third switch Q4 is grounded, and the third terminal of the third switch Q4 is connected to the relay K2. The two ports K2+ and K2- of the relay K2 are connected to the input and output ports of switch 2 in the power-on circuit of the battery module 20, respectively. When the battery module 20 needs to be turned off, the controller 42 pulls the level of the CTRL2 port high (in other embodiments, the level of the CTRL2 port can also be pulled low) and maintains it for a certain period of time to turn on the third switch Q4. After the third switch Q4 is turned on, the current provided by the power switch module 41 flows through the coil of the relay K3, causing the contacts of the relay K3 to close. At this time, the BMS in the battery module 20 detects a signal at the PEM signal detection port, and the BMS controls the self-locking relay to open, thereby disconnecting the circuit between the battery cell and the voltage conversion module. This completes the shutdown of the battery module 20.

[0066] Furthermore, such as Figure 6 As shown, the switch control module 45 also includes resistors R3 and R4, capacitors C3 and C4, diode D3, and TVS diode D4. Resistor R3 is a current-limiting resistor used to limit the current at the first terminal of the third switch Q4 and suppress oscillation. Resistor R4 is a pull-down resistor used to ensure reliable switching of the third switch. Capacitors C3 and C4 are used for energy storage to ensure a stable power supply to the coil of relay K2, and for filtering. Specifically, capacitors C3 and C4 are used to filter signals of different frequency bands, thereby reducing interference and ensuring the stability and safety of relay K2 operation. Since a back electromotive force is generated when the contacts of relay K2 open, diodes D3 and D4 are provided to provide a protection circuit to protect the coil of relay K2.

[0067] The start / stop control device 40 has different operating modes. In different operating modes, the controller 42 executes different control strategies. Specifically, the controller 42 can determine the current operating mode of the machine and control the switching module 41 of the machine to operate according to the control strategy corresponding to the current operating mode.

[0068] The current operating mode refers to the operating state of the start-stop control device 40 at the current moment, which determines how the start-stop control device 40 manages the charging and discharging process of the battery. The operating mode may include, but is not limited to, the modes mentioned in the foregoing embodiments: normally closed mode, standby charging mode, and standby discharging mode.

[0069] The control strategy is a set of rules that define how the start / stop control device 40 should operate the switch module 41 under different operating modes. The control strategy aims to ensure that the photovoltaic charging module 30 can charge the battery module 20 in a way that better meets the charging needs of the battery module 20 in different usage scenarios.

[0070] In one possible example, determining the current operating mode of the machine includes: acquiring the power-on trigger signal that triggered the machine to power on; and determining the current operating mode based on the source of the power-on trigger signal.

[0071] Among them, the power-on trigger signal refers to the signal that initiates the power-on process of the start-stop control device 40.

[0072] The power-on trigger signal may include, but is not limited to: a high-voltage signal on the battery, which triggers the start-stop control device 40 to power on when the battery module 20 is connected to the system and provides high voltage; a button trigger signal, which allows the user to manually trigger the start-stop control device 40 to power on by pressing the power-on / off button (i.e., power-on operation) on the start-stop control device 40; and a timed wake-up signal, which automatically wakes up the start-stop control device 40 within a set time interval.

[0073] Specifically, the current operating mode is determined based on the source of the power-on trigger signal. Different trigger signal sources correspond to different operating modes. For example, when the start-stop control device 40 detects a high-voltage signal provided by the battery module 20, it defaults to the normally closed mode; when the user triggers the start-stop control device 40 to power on by pressing the power button, it defaults to the standby charging mode; when the start-stop control device 40 automatically wakes up within a set time interval, it enters the standby charging mode.

[0074] In this embodiment, the start / stop control device 40 can flexibly adjust its operating mode according to different power-on trigger signals to adapt to the usage requirements in different scenarios.

[0075] In one possible example, determining the current operating mode of the machine includes: during the power-on period of the machine, acquiring a mode indication signal generated by the machine upon receiving a mode switching operation from the user; and determining the current operating mode based on the mode indication signal.

[0076] The mode switching operation can be performed by operating physical buttons, touch screens, knobs, or remote control. Figure 3 The example shown illustrates how to switch modes by operating physical buttons.

[0077] As an example, when the mode indication signal is the first indication signal, the current operating mode is normally closed mode; when the mode indication signal is the second indication signal, the current operating mode is standby charging mode; and when the mode indication signal is the third indication signal, the current operating mode is standby discharging mode.

[0078] Specifically, when the user performs these operations, the corresponding hardware or software module will generate a mode indication signal, which represents the specific operating mode that the user wants the start / stop control device 40 to enter.

[0079] In this process, the user's mode switching operation takes precedence over the automatic mode switching of the start-stop control device 40. When the user issues a mode switching instruction signal, the start-stop control device 40 will immediately respond and switch to the corresponding operating mode. After the user performs the mode switching operation, the start-stop control device 40 should provide corresponding feedback (such as LED indicator lights, buzzer prompts, etc.) to confirm that the mode switching has been successfully executed.

[0080] This embodiment can respond to direct user commands and flexibly adjust its operating status according to user operation needs, thereby providing more personalized and intelligent services.

[0081] In this embodiment, by establishing a correspondence between the mode indication signal and the operating mode, the start-stop control device 40 can flexibly adjust its operating state according to different user needs and environmental conditions, thereby achieving efficient energy management and improving user experience.

[0082] In one possible example, when the current operating mode is normally closed, the switching module 41 of the machine is controlled to operate according to the control strategy corresponding to the current operating mode, including: monitoring the power parameters of the battery module 20; and controlling the operation of the switching module 41 according to the relationship between the power parameters and the power threshold.

[0083] Among them, the power parameter refers to the remaining power (SOC, State of Charge) of battery module 20.

[0084] Specifically, in normally closed mode, the control strategy is mainly determined based on the power parameters of battery module 20. The start / stop control device 40 continuously or periodically monitors the power parameters of battery module 20 to understand the status of battery module 20 and make a decision on whether to turn on switch module 41 accordingly.

[0085] The power threshold is a set of values ​​set by the start / stop control device 40 to determine whether the power level of the battery module 20 is within a safe or operable range. The power threshold can be adjusted according to factors such as the type and capacity of the battery module 20 and the operating environment.

[0086] In one possible example, the operation of the control switch module 41 is based on the power parameter, including: when the power parameter is less than or equal to a first power threshold, the control switch module 41 operates in an on state; when the power parameter is greater than the first power threshold but less than a second power threshold, the control switch module 41 maintains its current state; and when the power parameter is greater than or equal to the second power threshold, the control switch module 41 operates in an off state. The first power threshold and the second power threshold can be manually set or set by the manufacturer at the factory, and are not limited to a single value here.

[0087] In the normally closed mode, if the power parameter is greater than or equal to the second power threshold, the control switch module 41 operates in the open state, thereby stopping the photovoltaic charging module 30 from charging the battery module 20 to prevent the battery from being overcharged.

[0088] In the normally closed mode, if the power parameter is less than or equal to the first power threshold, the control switch module 41 operates in the on state, that is, the electrical connection between the battery module 20 and the photovoltaic charging module 30 is turned on, so that the photovoltaic charging module 30 charges the battery module 20, thereby ensuring that the battery module 20 can be replenished with power.

[0089] In the normally closed mode, if the power parameter is greater than the first power threshold and less than the second power threshold, the control switch module 41 maintains its current state. That is, if the switch module 41 is in the conducting state, it remains in the conducting state; if the switch module 41 is in the disconnected state, it remains in the disconnected state. It can be understood that when the start-stop control device 40 operates in the normally closed mode, the corresponding battery module 20 is typically used to power downstream loads such as power devices and household loads. In this scenario, the battery module 20 outputs power while being replenished by the photovoltaic charging module 30, which may cause the SOC of the battery module 20 to fluctuate around the first or second power threshold. Therefore, maintaining the current state of the control switch module 41 when the SOC is greater than the first power threshold and less than the second power threshold avoids the problem of the switch module 41 repeatedly switching between the conducting and disconnected states, thus extending the service life of the switch module 41.

[0090] For example, the second power threshold can be 99%, and the first power threshold can be 90%. If SOC ≤ 90%, the electrical connection between battery module 20 and photovoltaic charging module 30 is established, allowing photovoltaic charging module 30 to charge battery module 20; if 90% < SOC < 99%, the current state of switch module 41 is maintained; if SOC ≥ 99%, the electrical connection between battery module 20 and photovoltaic charging module 30 is disconnected. It should be noted that the above values ​​are merely illustrative and should not be construed as limiting this application.

[0091] In this embodiment, in the normally closed mode, the start-stop control device 40 intelligently manages the charging process of the battery module 20 based on the SOC value of the battery module 20. That is, when the battery is low, it connects the battery module 20 to the photovoltaic charging module 30 to supplement the battery module 20 with power, and disconnects the connection when the battery is high to prevent overcharging, thereby helping to keep the battery module 20 in the best working state.

[0092] In one possible example, controlling the operation of the switching module 41 of the machine according to the control strategy corresponding to the current operating mode also includes: monitoring the status of the high-voltage circuit of the battery module 20; controlling the switching module 41 to operate in the off state when the high-voltage circuit is in the off state; and controlling the machine to shut down.

[0093] When the high-voltage circuit is detected to be open, it indicates that there is no electrical connection between the battery module 20 and the downstream load. This could be due to system design safety measures, user operation, fault protection, or other reasons. In this case, the start-stop control device 40 controls the switch module 41 to enter the open state. It is understood that the photovoltaic charging module 20 charges the battery cells through the high-voltage circuit. When the high-voltage circuit is open, it may be because the user does not want the battery module 20 to supply power externally, or the battery module 20 has malfunctioned and the high-voltage circuit needs to be disconnected for fault protection. In this situation, whether from a user's perspective or a safety perspective, it is undesirable for the high-voltage circuit to be closed again to receive power from the photovoltaic charging module 20. Therefore, the switch module 41 does not need to be turned on in this state. Furthermore, the start-stop control device 40 can also control the device to shut down and not wake up again, thereby reducing the power consumption of the start-stop control device 40.

[0094] In one possible example, when the current operating mode is standby charging mode, the switching module 41 of the machine is controlled to operate according to the control strategy corresponding to the current operating mode, including: sending a power-on signal to the battery module 20 to instruct the battery module 20 to power on; controlling the switching module 41 to operate in the on state; monitoring the power parameters of the battery module 20 and the charging current output by the photovoltaic charging module 30; and controlling the operation of the switching module 41 based on the power parameters and the charging current.

[0095] When the start-stop control device 40 operates in standby charging mode, the corresponding battery module 20 is typically in a powered-off state (i.e., both the high-voltage and low-voltage circuits are off). In this case, to enable the photovoltaic charging module 30 to charge the battery module 20, the start-stop control device 40 needs to first power on the battery module 20. For an example, please refer to... Figure 3 and Figure 5 The power-on signal can be the signal output from the CTRL1 port. After the battery module 20 is powered on, the start / stop control device 40 controls the operation of the switch module 41 according to the power parameters and charging current.

[0096] The switch module 41 is adjusted based on the monitored power parameters and charging current. For example, if the battery module 20 has a low power level, the start-stop control device 40 will keep the switch module 41 in the on state to allow continuous charging; if the battery module 20 is close to full charge, the start-stop control device 40 will switch the switch module 41 to the off state to prevent overcharging; if an abnormal charging current is detected, the start-stop control device 40 will immediately disconnect the switch module 41 to protect the battery module 20 and the start-stop control device 40 from damage.

[0097] In this embodiment, the start-stop control device 40 can intelligently manage the charging process in standby charging mode, ensuring that the battery module 20 is effectively charged under safe conditions.

[0098] In one possible example, the control switch module 41 operates in the on state later than the time when the power-on signal is sent to the battery module 20, and the two times are separated by a first preset time.

[0099] The first preset duration refers to the time interval from sending the power-on signal to the battery module 20 to the control switch module 41 operating in the on state. The first preset duration can be 3s, 5s, 10s or other times, and is not limited to a single time.

[0100] The moment when the power-on signal is sent to the battery module 20 refers to the initial moment, the end moment, or any moment between the initial and end moments when the start-stop control device 40 sends the power-on signal to the battery module 20. The moment when the control switch module 41 operates in the on state can be the moment when the controller 42 sends a drive signal to the switch module 41.

[0101] It is understandable that the BMS typically performs adhesion detection on the main positive relay and / or main negative relay of the high-voltage circuit. If the switching module 41 turns on earlier than the high-voltage circuit, the photovoltaic charging module 30 will transmit power to the battery module 20, at which point the voltages at the P+ and P- high-voltage ports will not be zero. The BMS will detect this non-zero voltage at the P+ and P- high-voltage ports, determine that the main positive relay and / or main negative relay are stuck, and report an adhesion fault. This results in a false alarm. Therefore, the switching module 41 must turn on later than the high-voltage circuit to avoid false alarms and ensure the normal operation of the power system 10.

[0102] In one possible example, the operation of the control switch module 41 based on the power parameters and charging current includes: when the power parameters are less than a second power threshold and the charging current reaches a first current threshold, controlling the control switch module 41 to operate in a conducting state; when the power parameters are less than the second power threshold and the charging current is less than the first current threshold, controlling the control switch module 41 to operate in a disconnected state; sending a power-off signal to the battery module 20 to instruct the battery module 20 to power off; after an interval of a second preset time, returning to the step of sending a power-on signal to the battery module 20 to instruct the battery module 20 to power on; when the power parameters reach the second power threshold, sending a power-off signal to the battery module 20 to instruct the battery module 20 to power off; and controlling the device to power off.

[0103] The first current threshold can be 2A, and is not limited to this specific value. Furthermore, the first current threshold is used to determine whether charging is effective. If the charging current is lower than this threshold, it may indicate that the photovoltaic charging module 30 cannot provide a sufficient charging current to charge the battery module 20.

[0104] The second preset duration can be one hour or other times; there is no single limitation here.

[0105] When the battery module 20's charge level is below a set second charge threshold (e.g., 99%) and the charging current reaches a set first current threshold (e.g., 2A), it indicates that the battery module 20 is not fully charged, and the photovoltaic charging module 30 can provide a significant amount of power. Therefore, the start-stop control device 40 determines that charging is suitable at this time and controls the switch module 41 to turn on, allowing the photovoltaic charging module 30 to charge the battery module 20. When the battery module 20's charge level is below the second charge threshold, but the charging current is insufficient (less than 2A), it indicates that the photovoltaic charging module 30 cannot provide a significant amount of power. If the photovoltaic charging module 30 is allowed to charge the battery module 20, the battery module 20's self-consumption may exceed the power provided by the photovoltaic charging module 30, resulting in a decrease in the battery module 20's charge level. Therefore, the start-stop control device 40 determines that continuing charging is not suitable at this time and controls the switch module 41 to turn off to stop charging. Furthermore, the start-stop control device 40 sends a shutdown signal to the battery module 20 to ensure the battery module 20 is safely shut down. After waiting for a period of time (a second preset time), the start-stop control device 40 again controls the battery module 20 to apply high voltage to re-attempt charging. When the battery module 20's charge level reaches or exceeds a second charge threshold, the start-stop control device 40 determines that the battery module 20 is fully charged or has reached the set charging target. The start-stop control device 40 then sends a shutdown signal to the battery module 20 to ensure the battery module 20 is safely shut down, stopping charging and controlling the device itself to shut down to reduce energy consumption.

[0106] In this embodiment, the start-stop control device 40 can optimize charging efficiency and reduce energy consumption while ensuring the safe charging of the battery module 20.

[0107] In one possible example, when the power parameter is less than the second power threshold and the charging current is less than the first current threshold, the control switch module 41 operates in the off state, including: when the power parameter is less than the second power threshold, the device communicates normally with the battery module 20, and the charging current is less than the first current threshold for a third preset time, the control switch module 41 operates in the off state.

[0108] The third preset duration can be ten minutes or other times; there is no single limitation here.

[0109] It is understandable that the charging current being less than the second current threshold may be due to current fluctuations in the circuit or the photovoltaic charging module 30 being unable to provide a large charging current due to sunlight being blocked by clouds or other factors for a short period of time. Furthermore, the power parameters may not be transmitted from the battery module 20 to the start / stop control device 40 in a timely manner due to communication abnormalities, resulting in an inability to accurately compare the power parameters with the second power threshold. These situations can all lead to interruptions in the charging process. To avoid frequent switching between the battery module 20 and the power-on / power-off states, and frequent switching between the switch module 41 and the on / off states, the battery module 20 should be powered off and the switch module 41 should be disconnected only after all three conditions are met and maintained for a certain period of time.

[0110] In this embodiment, the battery module 20 is ensured to be charged in time when it is not fully charged. During the charging process, if the charging current is detected to be lower than the preset value, it indicates that the charging efficiency is reduced. At this time, the start-stop control device 40 interrupts the charging process to reduce the energy consumption of the battery module 20.

[0111] In one possible example, when the current operating mode is standby discharge mode, the switching module 41 of the machine is controlled to operate according to the control strategy corresponding to the current operating mode, including: monitoring the power parameters of the battery module 20; and controlling the operation of the switching module 41 based on the power parameters.

[0112] When the start-stop control device 40 operates in standby charging mode, the corresponding battery module 20 is typically used in scenarios where the battery module 20 is in a powered-off state but needs to be periodically woken up to power loads such as water pumps. In standby discharge mode, the start-stop control device 40 detects the power consumption of the battery module 20 to ensure that the battery module 20 is not over-discharged. Furthermore, the start-stop control device 40 dynamically adjusts the operating state of the switch module 41 based on changes in power parameters to achieve effective battery management.

[0113] If the battery module 20 has a charge level higher than a set threshold (e.g., fully charged), the switch module 41 may remain in the ON state, allowing the battery module 20 to discharge. If the battery module 20 has a charge level lower than another set threshold (e.g., insufficient charge), the start-stop control device 40 may switch the switch module 41 to the OFF state to stop the discharge in order to protect the battery module 20 from over-discharge. In some cases, the start-stop control device 40 may issue a warning when the battery module 20's charge level drops to a specific level, prompting the user to charge or reduce power consumption.

[0114] In this embodiment, the discharge process of the battery module 20 can be effectively managed in standby discharge mode, ensuring that the battery module 20 can provide stable power when needed, while protecting the battery module 20 from damage when the power is insufficient.

[0115] In one possible example, the operation of the control switch module 41 based on the power parameter includes: when the power parameter is greater than or equal to a second power threshold, the control switch module 41 operates in an off state; when the power parameter is greater than a first power threshold and less than the second power threshold, the control switch module 41 maintains its current state; when the power parameter is less than or equal to the first power threshold and greater than a third power threshold, the control switch module 41 operates in an on state; when the power parameter is less than or equal to the third power threshold, a power-off signal is sent to the battery module 20 to instruct the battery module 20 to power off; and the device itself is powered off.

[0116] The third battery level threshold can be 10%, used to determine if the battery module 20 has too low a battery level and needs to be shut down for protection. This third battery level threshold can be set manually or by the manufacturer at the factory; there is no single limitation here.

[0117] When the power parameter is greater than or equal to the second power threshold, it indicates that the battery module 20 has a very sufficient power. In order to prevent the battery module 20 from being overcharged, the start-stop control device 40 will control the switch module 41 to operate in the off state and stop the battery module 20 from charging further.

[0118] When the power parameter is greater than the first power threshold and less than the second power threshold, it indicates that the power of the battery module 20 is at a medium level. The start-stop control device 40 will decide whether to continue charging or maintain the current state based on the current needs and environmental conditions.

[0119] Specifically, when the power parameter is less than or equal to the first power threshold and greater than the third power threshold, it indicates that the power of the battery module 20 has dropped to a certain level, but there is still enough power to supply the equipment. At this time, the start / stop control device 40 will control the switch module 41 to operate in the on state, allowing the battery module 20 to charge while ensuring that the battery module 20 supplies power to the downstream load.

[0120] Specifically, when the power parameter is less than or equal to the third power threshold, since the third power threshold is the minimum safe level of power for battery module 20, for example 10%, when the power drops to this level, in order to protect battery module 20 from damage, start-stop control device 40 will send a shutdown signal to battery module 20, instructing battery module 20 to shut down and control the device to shut down itself, in order to prevent battery module 20 from over-discharging.

[0121] In this embodiment, the operating state of the switch module 41 can be intelligently controlled under different power levels, thereby optimizing the utilization efficiency and lifespan of the battery module 20, while ensuring the stable operation of the device.

[0122] In one possible example, before monitoring the power parameters of the battery module 20, the controller 42 is also configured to: send a power-on signal to the battery module 20 to instruct the battery module 20 to power on; send a power-off signal to the battery module 20 at a fourth preset time interval to instruct the battery module 20 to power off; and return to the step of sending the power-on signal to the battery module 20 after a fifth preset time interval.

[0123] The fourth preset duration can be 1 hour, 6 hours, etc., and there is no single limitation here.

[0124] The fifth preset duration can be 1 hour, 6 hours, etc., and there is no single limitation here.

[0125] For example, the standby discharge mode includes four sub-modes (also known as standby discharge states). In the first seed mode (i.e., the first standby discharge state), the fourth preset duration is 1 hour, and the fifth preset duration is 1 hour; in the second seed mode (i.e., the second standby discharge state), the fourth preset duration is 6 hours, and the fifth preset duration is 3 hours; in the third seed mode (i.e., the third standby discharge state), the fourth preset duration is 12 hours, and the fifth preset duration is 6 hours; in the fourth seed mode (i.e., the fourth standby discharge state), the fourth preset duration is 24 hours, and the fifth preset duration is 8 hours.

[0126] Before monitoring the battery module 20's power parameters, the start-stop control device 40 first sends a power-on signal to the battery module 20. The power-on signal wakes up the battery module 20, putting it into operation and preparing it for charging and / or discharging. After the battery module 20 is powered on, the start-stop control device 40 controls the switch module 41 to conduct, supplying power to the battery module 20. The battery module 20 also supplies power to downstream loads. If the battery module 20's power level does not fall below a third power threshold during operation, the battery module 20 will continue to run for a fourth preset duration. After this period, the start-stop control device 40 sends a power-off signal to the battery module 20, instructing it to enter a low-power or sleep state to save energy and extend its lifespan. After sending the power-off signal, the start-stop control device 40 waits for a fifth preset duration. After this fifth preset duration, the start-stop control device 40 returns and re-executes the step of sending the power-on signal, thus forming a periodic start-stop control loop. If the battery module 20 has been in the powered-on state for less than the fourth preset time, and the battery level of the battery module 20 is lower than the third power threshold, then in order to prevent the battery module 20 from over-discharging, the start-stop control device 40 will control the battery module 20 to shut down and will no longer wake up the battery module 20, and will also control the main unit to shut down.

[0127] In this embodiment, through this periodic start-stop control, the start-stop control device 40 can place the battery module 20 in a low-power state when it is not needed, thereby saving energy and extending the service life of the battery module 20. At the same time, the periodic power-on ensures that the battery module 20 can supply power to necessary equipment, guaranteeing the normal operation of the power system 10.

[0128] In one possible example, the controller 42 is also used to monitor the charging current of the photovoltaic charging module 30 while the switch module 41 is operating in the on state; and to control the switch module 41 to operate in the off state when the charging current is greater than a second current threshold.

[0129] For example, when the charging current exceeds 50A, the control switch module 41 disconnects to protect the battery module 20 from damage due to the high current. This ensures that the charging process is conducted within a safe and efficient range.

[0130] In this embodiment, by monitoring abnormal charging current of the photovoltaic charging module 30, the switch module 41 is disconnected, that is, the circuit connection between the battery module 20 and the photovoltaic charging module 30 is cut off, thereby stopping the charging process and preventing safety problems caused by excessive current.

[0131] In one possible example, when the charging current exceeds a second current threshold, the control switch module 41 operates in an off state, including: after the charging current exceeds the second current threshold for a seventh preset duration, the control switch module 41 operates in an off state. The seventh preset duration is, for example, 3 seconds, and this application does not limit this. This avoids frequent state switching of the switch module 41 caused by short-term current fluctuations, thus extending the service life of the switch module 41.

[0132] In one possible example, after the control switch module 41 is in the off state, the controller 42 is also configured to: control the switch module 41 to operate in the on state after a sixth preset time interval; and return to the step of monitoring the charging current of the photovoltaic charging module 30 during the period when the switch module 41 is in the on state.

[0133] The sixth preset duration can be ten seconds, and is not limited to this setting. The sixth preset duration provides a buffer time for the start-stop control device 40, allowing the charging current to potentially return to the normal range or mitigating conditions that may cause abnormal current.

[0134] Wherein, after the start-stop control device 40 detects that the charging current exceeds the second current threshold and therefore puts the switch module 41 in the off state, it does not permanently stop charging, but sets a waiting time, namely the sixth preset time.

[0135] After a sixth preset time period, the start-stop control device 40 will attempt to put the switch module 41 into the conducting state again to resume the charging process. The selection of this time interval is likely based on a comprehensive consideration of the response time of the start-stop control device 40 and charging safety.

[0136] After the switch module 41 is turned back on, the start-stop control device 40 will continue to monitor the charging current of the photovoltaic charging module 30 to confirm whether charging has returned to normal. If the charging current exceeds the second current threshold again, the start-stop control device 40 will again disconnect the switch module 41 and may repeat the above-mentioned waiting and retry process.

[0137] In this embodiment, the start-stop control device 40 is allowed not to immediately and completely stop charging in the event of a brief current anomaly, but rather to have a certain opportunity to self-correct. This helps to avoid unnecessary charging interruptions while ensuring the safety of the start-stop control device 40.

[0138] In the start-stop control device 40 and power system 10 of this application, a start-stop control device 40 is connected between the battery module 20 and the photovoltaic charging module 30. The start-stop control device 40 has a switch module 41, which is used to connect or disconnect the electrical connection between the battery module 20 and the photovoltaic charging module 30. The controller 42 can control the switch module 41 to connect or disconnect when the charging current is low, thereby realizing more flexible charging start-stop control, so that the photovoltaic charging module 30 can charge the battery module 20 in a way that meets the charging needs of the battery module 20.

[0139] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A start / stop control device, characterized in that, The start / stop control device includes: Power supply module; A current acquisition module is connected to the battery module and the photovoltaic charging module, and the current acquisition module is used to detect the charging current of the photovoltaic charging module. A switch module is connected to the power supply module to receive power from the power supply module. The switch module is also used to connect between the battery module and the photovoltaic charging module to conduct the electrical connection path between the battery module and the photovoltaic charging module in the on state and to disconnect the electrical connection path between the battery module and the photovoltaic charging module in the off state. The controller is connected to the power supply module to receive power from the power supply module. The controller is also connected to the switch module and the current acquisition module. The controller receives the charging current through its connection path with the current acquisition module, and transmits an electrical signal through its connection path with the switch module when the charging current is lower than the current threshold. The switch module is turned on under the action of the electrical signal.

2. The start / stop control device according to claim 1, characterized in that, The switching module includes an isolation drive circuit and a switching transistor. The isolation drive circuit is connected to the power supply module and the controller. After receiving the electrical signal, the isolation drive circuit drives the switching transistor to work.

3. The start / stop control device according to claim 2, characterized in that, The switching transistor includes a first switching transistor and a second switching transistor; The first terminal of the first switching transistor is connected to the isolation drive circuit, the second terminal of the first switching transistor is connected to the second terminal of the second switching transistor, and the third terminal of the first switching transistor is used to connect to the battery module. The first terminal of the second switching transistor is connected to the isolation drive circuit, and the third terminal of the second switching transistor is used to connect to the photovoltaic charging module.

4. The start / stop control device according to claim 1, characterized in that, The start / stop control device further includes a button detection module, which includes at least one of a power-on / off detection circuit and a mode switching detection circuit. One end of the power-on / off detection circuit is connected to the power supply module, and the other end of the power-on / off detection circuit is connected to the controller. The power-on / off detection circuit is used for the power-on / off detection of the start / stop control device itself. One end of the mode switching detection circuit is connected to the power supply module, and the other end of the mode switching detection circuit is connected to the controller. The mode switching detection circuit is used for mode switching detection of the start / stop control device.

5. The start / stop control device according to claim 4, characterized in that, The start / stop control device also includes a switch control module, which is connected to the power supply module and the controller. The switch control module can also be connected to the battery module to control the switch of the battery module.

6. The start / stop control device according to claim 5, characterized in that, The switch control module includes two control circuits; One end of one of the control circuits is connected to the controller, and the other end is used to connect to the power-on circuit of the battery module; One end of another control circuit is connected to the controller, and the other end is used to connect to the power-off circuit of the battery module.

7. The start / stop control device according to claim 6, characterized in that, Each of the control circuits includes a relay and a third switch transistor, one end of which is connected to the controller and the other end of which is connected to the relay; the relay is connected to the power supply module and can be connected to the battery module.

8. The start / stop control device according to claim 1, characterized in that, The power supply module includes a first DC-DC circuit, a charging management circuit, and a battery. The input terminal of the first DC-DC circuit is connected to the battery module, the output terminal of the first DC-DC circuit is connected to the input terminal of the charging management circuit, the output terminal of the charging management circuit is connected to the input terminal of the battery, and the output terminal of the battery is connected to the controller.

9. The start / stop control device according to claim 8, characterized in that, The power supply module further includes an isolated DC-DC circuit, the input terminal of which is connected to the output terminal of the first DC-DC circuit, and the output terminal of which is connected to the switching module; and / or The power supply module further includes a second DC-DC circuit, the input terminal of which is connected to the output terminal of the battery, and the output terminal of which is connected to the controller; and / or The power supply module also includes a battery protection circuit, the input terminal of which is connected to the output terminal of the battery, and the output terminal of which is connected to the input terminal of the second DC-DC circuit of the power supply module.

10. An electric power system, characterized in that, It includes a battery module, a photovoltaic charging module, and the start-stop control device as described in any one of claims 1 to 9.

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