A battery charge and discharge control circuit

Abstract

The present application provides a battery charge and discharge control circuit. The control circuit adopts a semi-split port configuration and includes a drive module, a charging control circuit, a discharging control circuit, and a wake-up module. The wake-up module sends a wake-up signal to the wake-up module when a charging device is connected between the charging and discharging positive pole and the charging negative pole, or when the discharging negative pole is connected to a power circuit. When the drive module receives the wake-up signal, it controls the connection and disconnection between the battery negative pole and the charging negative pole through the charging control circuit and the charging device connection status, and controls the connection and disconnection between the battery negative pole and the discharging negative pole through the discharging control circuit. When the drive module does not receive the wake-up signal, it disconnects the battery negative pole from the charging negative pole through the charging control circuit, and disconnects the battery negative pole from the discharging negative pole through the discharging control circuit. The control circuit provided in the present application can automatically wake up the drive module without occupying the resources of the main control chip, and independently controls the connection and disconnection status of the charging and discharging negative poles and the battery negative pole, ensuring power safety.

Description

Technical Field

[0001] The present application belongs to the field of battery control technology, and relates to battery charge and discharge control technology. Specifically, a battery charge and discharge control circuit is provided. Background Art

[0002] According to the connection or isolation of the charging port and the discharging port, the battery charging and discharging control scheme can be divided into the same-port charging and discharging, full-port charging and discharging, and half-port charging and discharging schemes. Among them, the half-port charging and discharging avoids the problem of simultaneous charging and discharging in the same-port mode. Therefore, it has been widely used in the control of charging and discharging of battery modules fixedly installed inside electrical equipment.

[0003] The current solution for half-split charging and discharging control of battery modules generally uses a main control chip such as an MCU with monitoring and programming functions to control the charging circuit and the discharging circuit by monitoring the charging and discharging current and voltage of the charging port and the discharging port. However, this control method requires that the main control chip continuously collects the status of the charging port and the discharging port, and determines the control of the charging and discharging process by analyzing the collected data. For electrical equipment using embedded systems, the above data collection, analysis and control process undoubtedly consumes the computing resources of the main control chip, affecting its computing power allocation in realizing core functions. In addition, although there are some protection boards with half-split charging and discharging modes, they can only perform preset high-temperature protection, overcharge and over-discharge protection and other controls through communication with the main control chip in the working state.

[0004] Obviously, for electrical devices using embedded systems, it is necessary to provide a solution that does not require communication control through the main control chip and can autonomously start and shut down the charging and discharging functions according to the device access status of the charging port and discharging port or user needs. Summary of the Invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present application provides a battery charging and discharging control circuit, which is applied to batteries with half-split charging and discharging methods, so that it can autonomously wake up the drive module to perform charging and discharging operations according to the charging device access status or user needs.

[0006] The battery charge and discharge control circuit has a charge and discharge positive electrode arranged at the same port, and a charge negative electrode and a discharge negative electrode arranged at separate ports, wherein the charge and discharge positive electrode is connected to the battery positive electrode.

[0007] The battery charge and discharge control circuit provided in this application includes a driving module, a charging control circuit, a discharging control circuit and a wake-up module;

[0008] When the wake-up module is connected to a charging device between the positive charging and discharging electrode and the negative charging electrode, or when the negative discharge electrode is connected to a power circuit, the wake-up module sends a wake-up signal to the wake-up module;

[0009] When receiving the wake-up signal, the driving module sends a charging control signal and a discharging control signal to the charging control circuit and the discharging control circuit respectively. The charging control circuit controls the connection between the negative electrode of the battery and the negative electrode of the charging device according to the charging control signal and the connection status of the charging device. The discharging control circuit controls the connection between the negative electrode of the battery and the negative electrode of the discharging device according to the discharging control signal.

[0010] When the driving module does not receive the wake-up signal, the charging control circuit disconnects the negative electrode of the battery from the negative electrode of charging, and the discharging control circuit disconnects the negative electrode of the battery from the negative electrode of discharging.

[0011] Furthermore, the power supply end of the driving module is connected to the first power supply, and the mode end is connected to the output end of the wake-up module for receiving the wake-up signal; the potential of the wake-up signal is the same as the potential of the first power supply.

[0012] Furthermore, the wake-up module includes a first monitoring circuit, a second monitoring circuit and a wake-up signal output circuit; when the charging device is connected between the positive charging and discharging pole and the negative charging pole, the first monitoring circuit outputs a charging device access signal; when the negative discharge pole is connected to the power circuit powered by the second power supply, the second monitoring circuit outputs a dischargeable signal; when the wake-up signal output circuit receives the charging device access signal and / or the dischargeable signal, it outputs the wake-up signal to the mode end of the driving module.

[0013] Preferably, the first monitoring circuit includes a first optocoupler element and a first resistor, one input end of the first optocoupler element is connected to the positive charging and discharging electrode through the first resistor, the other input end is connected to the negative charging electrode, the ground end is grounded, and the output end is connected to the enable end of the wake-up signal output circuit.

[0014] Preferably, the second monitoring circuit includes a second optocoupler element and a second resistor, one input end of the second optocoupler element is connected to the second power supply through the second resistor, the other input end is connected to the negative discharge electrode, the ground end is grounded, and the output end is connected to the enable end of the wake-up signal output circuit.

[0015] Preferably, the second monitoring circuit controls the connection and disconnection of the second power supply and the negative discharge electrode through a mechanical switch or an electrically controlled switch tube.

[0016] Optionally, the potential of the second power supply is the same as or different from that of the first power supply.

[0017] Furthermore, the wake-up signal output circuit is a normally open switch circuit, a first end of which is connected to the first power supply, and a second end of which is connected to the mode end of the driving module. When the enabling end receives the charging device access signal and / or the dischargeable signal, it connects the first power supply and the mode end of the driving module.

[0018] Furthermore, the battery charge and discharge control circuit further includes a trigger module, and when the driving module receives the wake-up signal sent by the trigger module, it sends a charge control signal and a discharge control signal to the charge control circuit and the discharge control circuit respectively.

[0019] Preferably, the trigger module is a pop-up button, and two contacts of the pop-up button are respectively connected to the first power supply and the mode end of the driving module.

[0020] Preferably, the charging control circuit conducts the battery negative electrode and the charging negative electrode only when the signal output by the charging control terminal of the driving module is a corresponding conduction signal and a charging device is connected between the charging and discharging positive electrode and the charging negative electrode.

[0021] Preferably, the charging control circuit includes a first switching tube and a first relay; the enable end of the first switching tube is connected to the charging control end of the driving module, and the first end is connected to the negative charging electrode; the first end of the first relay is connected to the negative electrode of the battery, and the second end is connected to the negative charging electrode, the first end of the coil of the first relay is connected to the positive charging and discharging electrode, and the second end of the coil of the first relay is connected to the second end of the first switching tube.

[0022] Furthermore, the discharge control circuit is enabled by the discharge control terminal of the driving module, and conducts between the battery negative electrode and the discharge negative electrode when the signal output by the discharge control terminal is a corresponding conduction signal.

[0023] Preferably, the discharge control circuit includes a second switching tube and a second relay; the enable end of the second switching tube is connected to the discharge control end of the driving module, and the first end is connected to the negative electrode of the battery; the first end of the second relay is connected to the negative electrode of the battery, and the second end is connected to the negative electrode of the discharge; the first end of the coil of the first relay is connected to the second end of the second switching tube, and the second end of the coil of the second relay is connected to the positive electrode of the charge and discharge.

[0024] The battery charge and discharge control circuit provided in this application can wake up the drive module in sleep mode without occupying the computing and communication resources of the main control chip such as the MCU, and then automatically enter different charge and discharge modes according to different charging and discharging scenarios, and ensure power safety by separately controlling the on and off status of the charging and discharging negative poles and the battery negative pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the system architecture of a battery charge and discharge control circuit provided according to an embodiment of the present application;

[0026] Figure 2 Schematic diagram of pins of a driving module in some preferred embodiments;

[0027] Figure 3 is a schematic diagram of the architecture of the wake-up module in some preferred embodiments;

[0028] Figure 4 is a schematic diagram of a first monitoring circuit in some preferred embodiments;

[0029] Figure 5 is a schematic diagram of a second monitoring circuit in some preferred embodiments;

[0030] Figure 6 is a schematic diagram of a charging control circuit in some preferred embodiments;

[0031] Figure 7 FIG. 4 is a schematic diagram of a discharge control circuit in some embodiments. DETAILED DESCRIPTION

[0032] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0033] In the description of the technical solution provided by this application in this specification, words such as first and second are used to distinguish different units, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance. In addition, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an electrical connection, a communication connection, or the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0034] Figure 1 FIG. 1 shows a schematic diagram of a battery charge and discharge control circuit according to some preferred embodiments of the present application. Figure 1 As shown, the control circuit adopts a half-split charge and discharge control method to charge and discharge the battery, wherein the positive electrode of the battery is connected to the charge and discharge positive electrode of the same port, which is marked as B+ in the drawings of this specification, and the charging negative electrode and the discharging negative electrode are isolated from each other, which are marked as C- and P- in the drawings of this specification. In addition, the negative electrode of the battery is marked as B- in the drawings of this specification.

[0035] like Figure 1As shown, the battery charge and discharge control circuit provided in this application includes a driving module, a charging control circuit, a discharging control circuit and a wake-up module.

[0036] Among them, when the wake-up module is connected to a charging device between the positive charging and discharging pole B+ and the negative charging pole C-, or when the negative discharge pole P- is connected to a power circuit, a wake-up signal is sent to the mode end SHIP of the wake-up module; the mode end SHIP of the driving module enters the working mode when receiving the wake-up signal, and enters the sleep mode when no wake-up signal is received.

[0037] Furthermore, when the drive module is in working mode, it sends a charging control signal to the charging control circuit through the charging control terminal CHG and sends a discharging control signal to the discharging control circuit through the discharging control terminal DSG; at this time, the charging control circuit controls the connection between the battery negative electrode B- and the charging negative electrode C- according to the received charging control signal and the connection status of the charging device between the charging and discharging positive electrode B+ and the charging negative electrode C-, and the discharge control circuit controls the connection between the battery negative electrode B- and the discharging negative electrode P- through the discharge control signal.

[0038] When the driving module is in the sleep mode, it disconnects the battery negative electrode from the charging negative electrode through the charging control circuit and disconnects the battery negative electrode from the discharging negative electrode through the discharging control circuit.

[0039] In the aforementioned battery charge and discharge control circuit, the wake-up module can automatically wake up the driver module based on the connection status of the charging device or the power consumption of the device at the discharge port, allowing it to take over control of charging and discharging. Alternatively, if the charging device is unplugged and the system has no power demand, the driver module automatically enters sleep mode, simultaneously de-energizing both the charging and discharge ports. With this architecture, the driver module can autonomously control the charging and discharging of the half-split port without requiring a communication connection with the main control chip. This changes the existing control model, which requires the driver module to be in active mode and continuously receive control signals from the main control chip in order to control battery charging and discharging. This saves the main control chip's computing resources and effectively improves system performance for power-consuming devices based on embedded architectures.

[0040] In some specific embodiments, such as Figure 1 As shown, the power supply terminal VBAT of the driving module is powered by the first power supply VSS1, and the potential of the wake-up signal is the same as the potential of the first power supply VSS1, that is, when the potential of the mode terminal SHIP is raised to the potential of the first power supply VSS1, the driving module is awakened and enters the working mode.

[0041] Those skilled in the art can select suitable front-end chips for battery BMS, battery protection chips, etc. as driving modules according to system design indicators. The above-mentioned front-end chips for battery BMS generally have at least one mode selection pin for switching modes. Different operating modes can be entered through different combinations of potentials connected to its various mode selection pins.

[0042] For example, you can choose Figure 2 The BMS shown uses the front-end chip SH367309 as a driver module. It has a power supply terminal VBAT and a mode terminal SHIP. When the mode terminal SHIP is short-circuited with the VBAT terminal, it can exit the storage mode (i.e., sleep mode) and enter the collection mode or protection working mode according to the level of the MODE pin. In the above two modes, the charging and discharging control signals are output through the CHG and DSG pins.

[0043] Figure 3 The schematic diagram of the architecture of the wake-up module in a preferred example of the present application is shown. As shown in 3, the wake-up module includes a first monitoring circuit, a second monitoring circuit and a wake-up signal output circuit, wherein the first monitoring circuit outputs a charging device access signal when a charging device is connected between the charging and discharging positive pole and the charging negative pole, and the second monitoring circuit outputs a dischargeable signal when the discharge negative pole is connected to a power circuit powered by a second power supply. When the wake-up signal output circuit receives the charging device access signal and / or the dischargeable signal, it outputs a wake-up signal to the mode end of the driving module.

[0044] In some preferred embodiments, Figure 4 As shown, the first monitoring circuit uses a first optocoupler element J1 and a first resistor R16 to monitor whether a charging device is connected, wherein one input terminal 11 of the first optocoupler element J1 is connected to the charging and discharging positive electrode B1+ through the first resistor R16, the other input terminal 12 is connected to the charging negative electrode C-, the ground terminal 13 is grounded, and the output terminal 14 is connected to the enable terminal of the wake-up signal output circuit.

[0045] When a charging device is connected, the power circuit of the LED of the first optocoupler element J1 and the first resistor R16 is connected, and the LED emits light to stimulate its output terminal 14 to be connected to the ground terminal 13, thereby outputting a low-level charging device connection signal to the wake-up signal output circuit through its output terminal 14.

[0046] In some preferred embodiments, Figure 5As shown, the second monitoring circuit includes a second optocoupler element J2 and a second resistor R19, wherein one input terminal 21 of the second optocoupler element J2 is connected to the second power supply VSS2, the other input terminal 22 is connected to the discharge negative electrode P-, and is connected to the second power supply VSS2 in a switchable manner through the second resistor R19, the ground terminal 23 is grounded, and the output terminal 24 is connected to the enable terminal of the wake-up signal output circuit.

[0047] In some optional embodiments, the second power supply VSS2 can be directly connected to the first power supply VSS1. In other optional embodiments, an external power supply can be used as the second power supply VSS2. For example, Figure 5 In the embodiment shown, the second power supply adopts a 5V power supply for external power supply.

[0048] A mechanical switch can be used to control the on / off connection between the second power supply VSS2 and the negative discharge electrode P-. For example, a mechanical button provided on an electrical device can be used. When the mechanical button is pressed, the LED of the second optocoupler element J2 is connected to the power circuit of the second resistor R19. The LED emits light to stimulate the conduction between its output terminal 24 and the ground terminal 23, thereby outputting a low-level dischargeable signal to the wake-up signal output circuit through its output terminal 24. In addition, an electrically controlled switch tube can also be used, whose enable terminal can be enabled by, for example, a control signal output by a main control unit. By switching its potential, the on / off connection between the second power supply VSS2 and the negative discharge electrode P- is controlled. By using a second monitoring circuit, the driver module can be kept in the working mode when the system is not in the charging state, so as to continuously control the battery discharge process. At the end of discharge, the driver module can be put into the sleep mode by disconnecting the second monitoring circuit.

[0049] The wake-up signal output circuit can adopt a normally open switch circuit with low-level conduction, whose two ends are respectively connected to the first power supply VSS1 and the mode end SHIP of the driving module, and its enable end is respectively connected to the output end 14 of the first monitoring circuit and the output end 24 of the second monitoring circuit. When a low-level charging device access signal and / or a dischargeable signal is received, the first power supply VSS1 and the mode end SHIP of the driving module are connected, thereby waking up the driving module.

[0050] In some preferred embodiments, the battery charge and discharge control circuit also includes a trigger module, which is used to manually wake up the drive module according to actual usage needs, so that it enters the working mode and sends a charging control signal and a discharging control signal to the charging control circuit and the discharging control circuit respectively.

[0051] The trigger module can be constructed using various technical means known to those skilled in the art. For example, in some preferred embodiments, the trigger module is a pop-up button, and its two contacts are respectively connected to the first power supply VSS1 and the mode terminal SHIP of the driving module.

[0052] Through the above circuit design, when the driver module is in a non-working state such as sleep mode, the driver module can enter the working mode and take over the control of charging and discharging by inserting a charging device, connecting to an external power supply, or manually triggering it.

[0053] In an embodiment of the present application, after the driving module enters the working mode, the charging control circuit will only conduct the battery negative electrode B- and the charging negative electrode C- when the signal output by the charging control terminal CHG of the driving module is a corresponding conduction signal (the conduction signal for controlling charging can be a high-level signal or a low-level signal, which can be determined according to the control method of the specific driving module selected) and a charging device is connected between the charging and discharging positive electrode B+ and the charging negative electrode C-.

[0054] like Figure 6 As shown, in some preferred embodiments, the charging control circuit includes a first switch tube Q9 and a first relay; wherein, the enable terminal (G pole) of the first switch tube Q9 is connected to the charging control terminal CHG of the driving module, and the first terminal (S pole) is connected to the charging negative electrode C-; the first terminal of the switch JK1 of the first relay is connected to the battery negative electrode B-, and the second terminal is connected to the charging negative electrode C-; the first terminal of the coil of the first relay is connected to the charging and discharging positive electrode B+, and the second terminal is connected to the second terminal (D pole) of the first switch tube Q9.

[0055] The level of the conduction signal for turning on the first switch tube Q9 can be determined according to the specific model of the driving module. For example, Figure 2 The SH367309 chip shown in the figure has a low CHG pin in sleep mode. When in normal operation, it outputs a high-level charging control signal based on the charging port's status. Therefore, the first switch Q9 can be a PMOS transistor that conducts at a high level. Similarly, if other BMS chips are used as the driver module, the appropriate switch model should be selected based on the control signal level.

[0056] In an embodiment of the present application, after the driving module enters the working mode, the discharge control circuit is enabled by the discharge control terminal DSG of the driving module. When the signal output by the discharge control terminal DSG is the corresponding conduction signal, the battery negative electrode B- and the discharge negative electrode P- are connected.

[0057] like Figure 7As shown, in some preferred embodiments, the discharge control circuit includes a second switch Q11 and a second relay. The enable terminal (G pole) of the second switch Q11 is connected to the discharge control terminal DSG of the drive module, and the first terminal is connected to the negative terminal B- of the battery. The first terminal of the switch JK2 of the second relay is connected to the negative terminal B- of the battery, and the second terminal is connected to the negative discharge terminal P-. The first terminal of the coil of the second relay is connected to the second terminal (D pole) of the second switch Q11, and the second terminal is connected to the positive charge and discharge terminal B+. The selection principle of the second switch Q11 is the same as that of the first switch Q9 and will not be repeated here.

[0058] The working principle of the battery charge and discharge control circuit provided in this application is as follows:

[0059] 1) When the SHIP terminal is not connected to VBAT, the driver module is in sleep mode. At this time, its ports CHG and DSG output low levels, causing Q9 and Q11 to be open. As a result, no potential difference can be formed across the coils of the first relay and the second relay, and switches JK1 and JK2 cannot be closed, resulting in no charge on the charging negative electrode C- and the discharging negative electrode P-.

[0060] 2) When an external power supply is connected via a mechanical button, or the negative discharge electrode is connected to a power circuit via a control signal from the main control unit, the second monitoring circuit sends a discharge signal to connect the SHIP terminal to the VBAT terminal. Alternatively, when a button on the trigger module is pressed, the SHIP terminal is connected to the VBAT terminal. At this time, the driver module exits sleep mode and outputs high-level CHG and DSG signals, turning on Q9 and Q11 respectively. At this time, since Q11 is turned on, the two ends of the coil of the second relay are connected to B- and B+ respectively, forming a potential difference, thereby attracting JK2, thereby entering a normal discharge state.

[0061] In this state, although the charging control circuit is in the Q9-on state, if no charging device is connected between C- and B+, C- is in a floating state, so that no potential difference can be formed at both ends of the coil of the first relay, and therefore JK1 cannot be attracted, thereby ensuring that the charging negative electrode C- is not charged when the charging device is not connected, thereby improving the circuit safety when not charging.

[0062] 3) When a charging device is connected between C- and B+, the first monitoring circuit sends a charging device connection signal to connect the SHIP terminal to the VBAT terminal. At this time, the driver module exits sleep mode and outputs high-level CHG and DSG signals, turning on Q9 and Q11 respectively. At this time, due to the conduction of Q11, the two ends of the coil of the second relay are connected to B- and B+ respectively, forming a potential difference, which in turn attracts JK2, and enters the normal discharge state.

[0063] At the same time, when Q9 is turned on, since the charging equipment is connected between C- and B+, there is a potential difference between the two ends of the coil of the first relay. At this time, JK1 is energized, C- and B- are turned on, and the device enters the normal charging state.

[0064] Through the above design, without occupying the computing and communication resources of the main control chip such as the MCU, the battery charge and discharge control circuit can automatically wake up the driver module when it is in sleep mode, and then automatically enter different charge and discharge modes according to different charge and discharge scenarios. By independently controlling the on and off status of the charging and discharging negative poles and the battery negative pole, power safety is ensured.

[0065] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery charge and discharge control circuit, comprising a charging and discharging positive electrode disposed at the same port, and a charging negative electrode and a discharging negative electrode disposed at separate ports, wherein the charging and discharging positive electrode is connected to the positive electrode of the battery, characterized in that: Including driving module, charging control circuit, discharging control circuit and wake-up module; When a charging device is connected between the positive and negative charging electrodes, or when the negative discharge electrode is connected to a power circuit, the wake-up module sends a wake-up signal to the driving module; When receiving the wake-up signal, the driving module sends a charging control signal and a discharging control signal to the charging control circuit and the discharging control circuit respectively. The charging control circuit controls the connection between the negative electrode of the battery and the negative electrode of the charging device according to the charging control signal and the connection status of the charging device. The discharging control circuit controls the connection between the negative electrode of the battery and the negative electrode of the discharging device according to the discharging control signal. When the driving module does not receive the wake-up signal, the charging control circuit disconnects the negative electrode of the battery from the charging negative electrode, and the discharging control circuit disconnects the negative electrode of the battery from the discharging negative electrode; The charging control circuit conducts the battery negative electrode and the charging negative electrode only when the signal output by the charging control terminal of the driving module is the corresponding conduction signal and a charging device is connected between the charging and discharging positive electrode and the charging negative electrode; The charging control circuit includes a first switching tube and a first relay; the enable terminal of the first switching tube is connected to the charging control terminal of the driving module, and the first terminal is connected to the negative charging electrode; the first terminal of the first relay is connected to the negative electrode of the battery, and the second terminal is connected to the negative charging electrode; the first terminal of the coil of the first relay is connected to the positive charging and discharging electrode, and the second terminal of the coil of the first relay is connected to the second terminal of the first switching tube; The discharge control circuit is enabled by the discharge control terminal of the driving module, and conducts electricity between the negative electrode of the battery and the negative electrode of the discharge when the signal output by the discharge control terminal is a corresponding conduction signal; The discharge control circuit includes a second switching tube and a second relay; the enable end of the second switching tube is connected to the discharge control end of the driving module, and the first end is connected to the negative electrode of the battery; the first end of the second relay is connected to the negative electrode of the battery, and the second end is connected to the negative electrode of the discharge; the first end of the coil of the first relay is connected to the second end of the second switching tube, and the second end of the coil of the second relay is connected to the positive electrode of the charge and discharge.

2. The battery charge and discharge control circuit according to claim 1, wherein: The power supply end of the driving module is connected to the first power supply, and the mode end is connected to the output end of the wake-up module for receiving the wake-up signal; The potential of the wake-up signal is the same as the potential of the first power supply.

3. The battery charge and discharge control circuit according to claim 2, wherein: The wake-up module includes a first monitoring circuit, a second monitoring circuit and a wake-up signal output circuit; When a charging device is connected between the positive charging and discharging electrode and the negative charging electrode, the first monitoring circuit outputs a charging device connection signal; The second monitoring circuit outputs a discharge signal when the discharge cathode is connected to a power circuit powered by a second power supply; The wake-up signal output circuit outputs the wake-up signal to the mode end of the driving module when receiving the charging device access signal and / or the dischargeable signal.

4. The battery charge and discharge control circuit according to claim 3, wherein: The first monitoring circuit includes a first optocoupler and a first resistor, one input end of the first optocoupler is connected to the positive charging and discharging electrode through the first resistor, the other input end is connected to the negative charging electrode, the ground end is grounded, and the output end is connected to the enable end of the wake-up signal output circuit.

5. The battery charge and discharge control circuit according to claim 3, wherein: The second monitoring circuit includes a second optocoupler and a second resistor, one input end of the second optocoupler is connected to the second power supply through the second resistor, the other input end is connected to the negative discharge electrode, the ground end is grounded, and the output end is connected to the enable end of the wake-up signal output circuit.

6. The battery charge and discharge control circuit according to claim 5, characterized in that: The second monitoring circuit controls the connection and disconnection of the second power supply and the discharge cathode through a mechanical switch or an electrically controlled switch tube.

7. The battery charge and discharge control circuit according to claim 5, characterized in that: The potential of the second power supply is the same as or different from that of the first power supply.

8. The battery charge and discharge control circuit according to claim 3, wherein: The wake-up signal output circuit is a normally open switch circuit, a first end of which is connected to the first power supply, and a second end is connected to the mode end of the driving module. When the enabling end receives the charging device access signal and / or the dischargeable signal, it connects the first power supply and the mode end of the driving module.

9. The battery charge and discharge control circuit according to claim 2, wherein: It also includes a trigger module. When the driving module receives the wake-up signal sent by the trigger module, it sends a charging control signal and a discharging control signal to the charging control circuit and the discharging control circuit respectively.

10. The battery charge and discharge control circuit according to claim 9, characterized in that: The trigger module is a pop-up button, and two contacts of the pop-up button are respectively connected to the first power supply and the mode end of the driving module.

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