Lead-acid battery management circuit

Abstract

The utility model discloses a lead-acid battery management circuit. The device is connected with a lead-acid battery and comprises an AFE acquisition module (100) and an MCU control module (200), the AFE acquisition module (100) comprises an AFE chip U1, a voltage acquisition module (110), a current acquisition module (120), an NTC acquisition module (130), a communication module (140) and a power supply module (150); the MCU control module (200) comprises an MCU chip U2, a charging control module (210), a discharging control module (220) and a protection module (230). According to the utility model, the voltage, current and temperature of the lead-acid battery can be monitored, the circuit can be actively cut off through the protection module, the lead-acid battery is prevented from being in an abnormal state for a long time, and the lead-acid battery protection circuit has the advantages of high safety and high stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lead -acid battery technical field, specifically a kind of lead -acid battery management circuit. BACKGROUND

[0002] Lead-acid battery is a common chemical power source, widely used in two-wheeled electric vehicles. In some abnormal conditions, lead-acid battery may catch fire during charging and discharging, so in order to prevent lead-acid battery from being in abnormal conditions for a long time, thereby avoiding lead-acid battery from catching fire, the state of lead-acid battery needs to be monitored and managed. Lead-acid battery BMS (Battery Management System, battery management system) is a kind of battery management system designed for lead-acid battery, which is mainly used for monitoring and managing the state of lead-acid battery to ensure the safety, stability and efficient operation of the battery. The current lead-acid battery management system mainly monitors the state of lead-acid battery by collecting the voltage, current and temperature information of lead-acid battery, and then controls the charging and discharging of lead-acid battery according to the state information of lead-acid battery; but when the temperature of lead-acid battery is too high during charging and discharging, the de-icing in the charging and discharging control loop of lead-acid battery may also be abnormally damaged due to the high temperature, which may cause the circuit to be disconnected by the charging and discharging control loop in the first time, and then lead-acid battery catches fire. Therefore, a lead-acid battery management circuit is needed, which can actively disconnect the circuit in the first time when lead-acid battery fails. SUMMARY

[0003] The utility model aims at providing a kind of lead-acid battery management circuit.The utility model can monitor the voltage, current and temperature of lead-acid battery, actively disconnect the circuit by protection module, avoid lead-acid battery from being in abnormal state for a long time, with the advantages of strong safety, high stability.

[0004] The technical scheme of the utility model: a kind of lead-acid battery management circuit, connected with lead-acid battery, including AFE acquisition module and MCU control module;The AFE acquisition module includes AFE chip U1, voltage acquisition module, current acquisition module, NTC acquisition module, communication module and power module;AFE chip U1 is connected voltage acquisition module, current acquisition module, NTC acquisition module, communication module and power module respectively;The MCU control module includes MCU chip U2, charging control module, discharging control module and protection module;MCU chip U2 is connected charging control module, discharging control module and protection module respectively;MCU chip U2 is connected communication module;AFE chip U1 is connected charging control module and discharging control module respectively.

[0005] The lead-acid battery management circuit, the NTC collection module includes capacitor C11, capacitor C15, capacitor C18, capacitor C21, diode D7, diode D15, resistor R15, resistor R28, thermistor NTC2, thermistor NTC3 and thermistor NTC4;One end of the capacitor C11 is connected with the AFE chip U1, the negative electrode of the diode D7 and one end of the resistor R15;The other end of the capacitor C11 is connected with the positive electrode of the diode D7 and the other end of the resistor R15, and grounded;One end of the capacitor C15 is connected with the AFE chip U1 and one end of the thermistor NTC2;The other end of the capacitor C15 is connected with the other end of the thermistor NTC2, and grounded;One end of the capacitor C18 is connected with the AFE chip U1 and one end of the thermistor NTC3;The other end of the capacitor C18 is connected with the other end of the thermistor NTC3, and grounded;One end of the capacitor C21 is connected with the AFE chip U1, one end of the resistor R28, the negative electrode of the diode D15 and one end of the thermistor NTC4;The other end of the capacitor C21 is connected with the other end of the resistor R28, the positive electrode of the diode D15 and the other end of the thermistor NTC4, and grounded.

[0006] The foregoing lead-acid battery management circuit, the voltage acquisition module includes resistance R3, resistance R5, resistance R6, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R16, resistance R19, resistance R20, resistance R24, resistance R25, resistance R26, resistance R29, resistance R30, resistance R31, resistance R33, resistance R34, resistance R37, resistance R38, capacitor C5, capacitor C9, capacitor C10, capacitor C12, capacitor C13, capacitor C17, capacitor C19, capacitor C20, capacitor C22, capacitor C26, capacitor C29, diode D3, diode D4; one end of the resistance R3 is connected to one end of the resistance R6, and is connected with the port F+; the other end of the resistance R6 is connected to one end of the capacitor C5 and the AFE chip U1; the other end of the resistance R3 is connected to one end of the resistance R8 and one end of the resistance R5; the other end of the resistance R8 is connected to the other end of the capacitor C5, one end of the capacitor C9 and the AFE chip U1; the other end of the resistance R5 is connected to one end of the resistance R10 and one end of the resistance R11; the other end of the resistance R10 is connected to the other end of the capacitor C9, one end of the capacitor C10 and the AFE chip U1; the other end of the resistance R9 is connected to one end of the resistance R12 and one end of the resistance R11; the other end of the resistance R12 is connected to the other end of the capacitor C10, one end of the capacitor C12 and the AFE chip U1; the other end of the resistance R11 is connected to one end of the resistance R16 and one end of the resistance R19; the other end of the resistance R16 is connected to the other end of the capacitor C12, one end of the capacitor C13 and the AFE chip U1; the other end of the resistance R19 is connected to one end of the resistance R20 and one end of the resistance R24; the other end of the resistance R20 is connected to the other end of the capacitor C13, one end of the capacitor C17 and the AFE chip U1; the other end of the resistance R24 is connected to one end of the resistance R25 and one end of the resistance R29; the other end of the resistance R25 is connected to the other end of the capacitor C17, one end of the capacitor C19 and the AFE chip U1; the other end of the resistance R29 is connected to one end of the resistance R26 and one end of the resistance R33; the other end of the resistance R26 is connected to the other end of the capacitor C19, one end of the capacitor C20 and the AFE chip U1; the other end of the resistance R33 is connected to one end of the resistance R30 and one end of the resistance R37; the other end of the resistance R30 is connected to the other end of the capacitor C20, one end of the capacitor C22 and the AFE chip U1; one end of the resistance R37 is connected to one end of the resistance R31 and one end of the resistance R38; the other end of the resistance R38 is grounded; the other end of the resistance R31 is connected to the other end of the capacitor C22, one end of the capacitor C26, the negative electrode of the diode D4 and the AFE chip U1; the other end of the capacitor C26 is connected to one end of the resistance R34, one end of the capacitor C29, the negative electrode of the diode D3 and the AFE chip U1; the other end of the resistance R34 is connected to one end of the resistance R36.The other end of the resistor R36 is connected to the other end of the capacitor C29, the positive electrode of the diode D3 and the positive electrode of the diode D4, and grounded.

[0007] The current collection module of the foregoing lead-acid battery management circuit comprises a current sampling resistor RS1, a current sampling resistor RS2, a current sampling resistor RS3, a current sampling resistor RS4, a capacitor C25, a capacitor C27, a capacitor C28, a resistor R32, a resistor R35, a resistor R39 and a resistor R40; one end of the capacitor C25 is connected to one end of the capacitor C27, one end of the resistor R35 and an AFE chip U1; the other end of the resistor R35 is connected to one end of the current sampling resistor RS1, one end of the current sampling resistor RS2, one end of the current sampling resistor RS3, one end of the current sampling resistor RS4, one end of the resistor R39 and one end of the resistor R40, and connected to a negative electrode B- of the lead-acid battery; the other end of the resistor R39 is connected to the other end of the resistor R40 and grounded; the other end of the capacitor C25 is connected to one end of the capacitor C28, one end of the resistor R32 and the AFE chip U1; the other end of the resistor R32 is connected to the other end of the current sampling resistor RS1, the other end of the current sampling resistor RS2, the other end of the current sampling resistor RS3 and the other end of the current sampling resistor RS4, and grounded; the other end of the capacitor C27 is connected to the other end of the capacitor C28 and grounded.

[0008] The communication module of the foregoing lead-acid battery management circuit comprises a resistor R13, a resistor R14, a resistor R17, a resistor R18, a resistor R21, a resistor R23, a diode D2, a capacitor C14 and a capacitor C16; one end of the resistor R13 is connected to an AFE chip U1, and the other end of the resistor R13 is connected to one end of a resistor R14; the other end of the resistor R14 is connected to one end of a resistor R18 and one end of a resistor R21, and connected to a 3.3V voltage source; one end of the resistor R17 is connected to the AFE chip U1, and the other end of the resistor R17 is connected to the other end of the resistor R18; one end of the capacitor C14 is connected to the AFE chip U1; one end of the capacitor C16 is connected to the AFE chip U1; the other end of the capacitor C14 is connected to the other end of the capacitor C16 and grounded; one end of the resistor R23 is connected to the AFE chip U1, and the other end of the resistor R23 is connected to the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the other end of the resistor R21 and an MCU chip U2.

[0009] The foregoing lead-acid battery management circuit, the power module includes diode D34, triode Q1, resistance R4, resistance R7 and capacitor C3, capacitor C6, capacitor C7, capacitor C8 and capacitor C43;The positive electrode of diode D34 is connected with voltage source;The negative electrode of diode D34 is connected with the collector of triode Q1;The base of triode Q1 is connected with one end of capacitor C3 and one end of resistance R4;The other end of resistance R4 is connected with one end of capacitor C43 and AFE chip U1;The other end of capacitor C43 is connected with the other end of capacitor C3 and grounded;The emitter of triode Q1 is connected with one end of capacitor C6, one end of capacitor C8 and one end of resistance R7;The other end of resistance R7 is connected with one end of capacitor C7 and outputs 5V voltage source;The other end of capacitor C6 is connected with the other end of capacitor C8 and the other end of capacitor C7 and grounded.

[0010] The foregoing lead-acid battery management circuit, the charge control module includes diode D26, diode D27, diode D28, diode D29, voltage regulator diode DZ4, voltage regulator diode DZ5, MOS tube Q4, MOS tube M6, MOS tube M7, MOS tube M8, MOS tube M9, MOS tube M10, MOS tube M11, TVS tube TVS8, TVS tube TVS9, triode Q13, triode Q19, resistance R47, resistance R53, resistance R61, resistance R63, resistance R95, resistance R140, resistance R141, resistance R142, resistance R143, resistance R144, resistance R145, resistance R146, resistance R147, resistance R150, resistance R152, capacitor C44 and capacitor C85;The source of the MOS tube Q4 is connected to the AFE chip U1, and the gate of the MOS tube Q4 is connected to one end of the resistance R47, and the other end of the resistance R47 is connected to the positive electrode of the lead-acid battery B+;The drain of the MOS tube Q4 is connected to one end of the resistance R152, and the other end of the resistance R152 is connected to the positive electrode of the diode D28 and the positive electrode of the diode D29;The negative electrode of the diode D29 is connected to the positive electrode of the diode D27, the base of the triode Q19 and one end of the resistance R143;The other end of the resistance R143 is connected to the port F+, one end of the resistance R53, the positive electrode of the voltage regulator diode DZ4, the source of the MOS tube M7, the source of the MOS tube M9 and the source of the MOS tube M11;The negative electrode of the diode D27 is connected to the emitter of the triode Q19, the negative electrode of the voltage regulator diode DZ4, one end of the resistance R140, one end of the resistance R142 and one end of the resistance R144;The collector of the triode Q19 is connected to the other end of the resistance R53;The other end of the resistance R140 is connected to the gate of the MOS tube M7;The other end of the resistance R142 is connected to the gate of the MOS tube M9;The other end of the resistance R144 is connected to the gate of the MOS tube M11;The drain of the MOS tube M7 is connected to the drain of the MOS tube M9, the drain of the MOS tube M11, the drain of the MOS tube M6, the drain of the MOS tube M8, the drain of the MOS tube M10 and one end of the TVS tube TVS7;The other end of the TVS tube TVS7 is connected to the source of the MOS tube M6, the source of the MOS tube M8, the source of the MOS tube M10, the positive electrode of the voltage regulator diode DZ5, one end of the resistance R150, one end of the resistance R146, one end of the capacitor C85, the negative electrode of the TVS tube TVS9, one end of the resistance R63 and one end of the resistance R61, and is connected to the charging port C+;The gate of the MOS tube M10 is connected to one end of the resistance R147;The gate of the MOS tube M8 is connected to one end of the resistance R145;The gate of the MOS tube M6 is connected to one end of the resistance R141;The other end of the resistance R147 is connected to the other end of the resistance R145, the other end of the resistance R141, the negative electrode of the voltage regulator diode DZ5, the emitter of the triode Q13 and the negative electrode of the diode D26.The positive pole of the diode D26 is connected with the negative pole of the diode D28, the base of the triode Q13 and the other end of the resistor R146; the collector of the triode Q13 is connected with the other end of the resistor R150; the other end of the capacitor C85 is connected with the positive pole of the TVS tube TVS9 and the other end of the resistor R63, and grounded; the other end of the resistor R61 is connected with one end of the resistor R95; the other end of the resistor R95 is connected with the negative pole of the TVS tube TVS8 and one end of the capacitor C44; the positive pole of the TVS tube TVS8 is connected with the other end of the capacitor C44, and grounded.

[0011] The foregoing lead-acid battery management circuit, the discharge control module includes resistance R98, resistance R99, resistance R100, resistance R102, resistance R155, resistance R156, resistance R157, resistance R158, resistance R159, resistance R160, resistance R161, resistance R164, resistance R166, resistance R168, MOS tube M12, MOS tube M13, MOS tube M14, MOS tube M15, MOS tube Q21, voltage stabilizing diode DZ6, voltage stabilizing diode DZ7, diode D29, diode D30, diode D31, diode D32, triode Q15, triode Q22, capacitor C87, capacitor C89, capacitor C90, TVS tube TVS10, TVS tube TVS11 and TVS tube TVS12; one end of the resistance R168 is connected to the AFE chip U1, and the other end of the resistance R168 is connected to the emitter of the triode Q22; one end of the resistance R166 is connected to the base of the triode Q22, and the other end of the resistance R166 is connected to the positive electrode of the diode D31; the negative electrode of the diode D31 is connected to one end of the resistance R102, the negative electrode of the TVS tube TVS11 and one end of the capacitor C90; the positive electrode of the TVS tube TVS11 is connected to the other end of the capacitor C90 and grounded; the positive electrode of the diode D30 is connected to the negative electrode of the diode D32, the base of the triode Q15 and one end of the resistance R164; the negative electrode of the diode D32 is connected to the negative electrode of the voltage stabilizing diode DZ7, one end of the resistance R159, one end of the resistance R160, one end of the resistance R157, one end of the resistance R156, one end of the resistance R155 and the emitter of the triode Q15; the collector of the triode Q15 is connected to one end of the resistance R98; the other end of the resistance R98 is connected to the positive electrode of the voltage stabilizing diode DZ7, the source of the MOS tube M15, the source of the MOS tube M14, the source of the MOS tube M13, the source of the MOS tube M12, one end of the TVS tube TVS10, one end of the capacitor C87, the other end of the resistance R164, the source of the MOS tube Q21, one end of the resistance R100, the positive electrode of the voltage stabilizing diode DZ6, one end of the resistance R161, one end of the capacitor C89, one end of the TVS tube TVS12 and one end of the resistance R99, and is connected to the discharge port P+; the drain of the MOS tube M15 is connected to the drain of the MOS tube M14, the drain of the MOS tube M13, the drain of the MOS tube M12, the other end of the TVS tube TVS10, the other end of the capacitor C87 and the port F+; the gate of the MOS tube M15 is connected to the other end of the resistance R160; the gate of the MOS tube M14 is connected to the other end of the resistance R157; the gate of the MOS tube M13 is connected to the other end of the resistance R156; the gate of the MOS tube M12 is connected to the other end of the resistance R155; the other end of the resistance R100 is connected to the other end of the resistance R102;The other end of the resistor R159 is connected to the drain of the MOS tube Q21; the gate of the MOS tube Q21 is connected to the negative electrode of the voltage stabilizing diode DZ6, the other end of the resistor R161 and the negative electrode of the diode D29; the positive electrode of the diode D29 is connected to one end of the resistor R158, and the other end of the resistor R158 is grounded; the other end of the capacitor C89 is connected to the positive electrode of the TVS tube TVS12 and the other end of the resistor R99, and is grounded.

[0012] The foregoing lead-acid battery management circuit, the protection module includes a fuse F2, a three-terminal fuse F3, a resistor R2, a resistor R57, a resistor R148, a resistor R149, a capacitor C86, a diode D25 and a MOS tube M16; one end of the fuse F2 is connected to the power input; the other end of the fuse F2 is connected to one end of the resistor R2 and one fuse end of the three-terminal fuse F3, and is connected to the port F+; the other fuse end of the three-terminal fuse F3 is connected to the positive electrode B+ of the lead-acid battery; the resistance end of the three-terminal fuse F3 is connected to the drain of the MOS tube M16, the other end of the resistor R2 and one end of the resistor R57; the gate of the MOS tube M16 is connected to one end of the resistor R148, one end of the capacitor C86 and one end of the resistor R149; the source of the MOS tube M16 is connected to the other end of the resistor R57, the other end of the resistor R149 and the other end of the capacitor C86, and is grounded; the other end of the resistor R148 is connected to the negative electrode of the diode D25, and the positive electrode of the diode D25 is connected to the MCU chip U2.

[0013] Compared with the prior art, in use, the voltage acquisition module, the current acquisition module and the NTC acquisition module of the AFE acquisition module respectively acquire the voltage, current and temperature information of the lead-acid battery, then the AFE chip U1 transmits the voltage, current and temperature information to the MCU chip U2 of the MCU control module through the communication module, the MCU chip U2 controls the charging and discharging of the lead-acid battery according to the voltage, current and temperature information through the control of the charging control module and the discharging control module; the MCU chip U2 can also actively fuse and disconnect the circuit through the protection module, thereby protecting the lead-acid battery; the utility model can monitor the voltage, current and temperature of the lead-acid battery, avoid the lead-acid battery being in an abnormal state for a long time, and has the advantages of high safety and high stability. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the circuit diagram of the AFE acquisition module;

[0015] Figure 2 is the circuit diagram of the current acquisition module;

[0016] Figure 3 is the circuit diagram of the NTC acquisition module;

[0017] Figure 4 is a circuit diagram of the communication module;

[0018] Figure 5 is a circuit diagram of the power module;

[0019] Figure 6 is a circuit diagram of the MCU chip U1;

[0020] Figure 7 is a circuit diagram of the charging control module;

[0021] Figure 8 is a circuit diagram of the discharging control module;

[0022] Figure 9 is a circuit diagram of the protection module.

[0023] The labels in the drawings are: 100-AFE acquisition module, 110-voltage acquisition module, 120-current acquisition module, 130-NTC acquisition module, 140-communication module, 150-power module, 200-MCU control module, 210-charging control module, 220-discharging control module, 230-protection module. DETAILED DESCRIPTION

[0024] The utility model will be further described below in combination with the drawings and examples, but not as the basis for limiting the utility model.

[0025] Example: lead-acid battery management circuit, as shown in Figure 1 and Figure 6 Connected with lead-acid battery, including AFE acquisition module 100 and MCU control module 200;The AFE acquisition module 100 includes AFE chip U1, voltage acquisition module 110, current acquisition module 120, NTC acquisition module 130, communication module 140 and power module 150;The AFE chip U1 is connected with voltage acquisition module 110, current acquisition module 120, NTC acquisition module 130, communication module 140 and power module 150 respectively;The MCU control module 200 includes MCU chip U2, charging control module 210, discharging control module 220 and protection module 230;The MCU chip U2 is connected with charging control module 210, discharging control module 220 and protection module 230 respectively;The MCU chip U2 is connected with communication module 140;The AFE chip U1 is connected with charging control module 210 and discharging control module 220 respectively.

[0026] The circuit of NTC acquisition module 130 is as shown in Figure 3As shown, the NTC collection module 130 includes a capacitor C11, a capacitor C15, a capacitor C18, a capacitor C21, a diode D7, a diode D15, a resistor R15, a resistor R28, a thermistor NTC2, a thermistor NTC3, and a thermistor NTC4; one end of the capacitor C11 is connected to the AFE chip U1, the negative electrode of the diode D7, and one end of the resistor R15; the other end of the capacitor C11 is connected to the positive electrode of the diode D7 and the other end of the resistor R15, and grounded; one end of the capacitor C15 is connected to the AFE chip U1 and one end of the thermistor NTC2; the other end of the capacitor C15 is connected to the other end of the thermistor NTC2, and grounded; one end of the capacitor C18 is connected to the AFE chip U1 and one end of the thermistor NTC3; the other end of the capacitor C18 is connected to the other end of the thermistor NTC3, and grounded; one end of the capacitor C21 is connected to the AFE chip U1, one end of the resistor R28, the negative electrode of the diode D15, and one end of the thermistor NTC4; the other end of the capacitor C21 is connected to the other end of the resistor R28, the positive electrode of the diode D15, and the other end of the thermistor NTC4, and grounded. The NTC collection module 130 is used for collecting temperature. The capacitor C11, the diode D7, and the resistor R15 constitute a communication interface NTC collection circuit, and a communication wire harness is externally connected to a water dropper NTC; the thermistor NTC2 is used for collecting the temperature of the charging control module 210; the thermistor NTC3 is used for collecting the temperature of the discharging control module 220; and the thermistor NTC4 is used for collecting the temperature in the environment. It can ensure that the lead-acid battery works in a suitable temperature range, and prevent the lead-acid battery from thermal runaway or thermal damage caused by excessively high temperature.

[0027] The circuit of the voltage collection module 110 is as shown in FIG. 2. Figure 1As shown, the voltage acquisition module 110 includes resistors R3, R5, R6, R8, R9, R10, R11, R12, R16, R19, R20, R24, R25, R26, R29, R30, R31, R33, R34, R37, R38, capacitors C5, C9, C10, C12, C13, C17, C19, C20, C22, C26, C29, diodes D3, D4; one end of the resistor R3 is connected to one end of the resistor R6, and is connected with the port F+; the other end of the resistor R6 is connected to one end of the capacitor C5 and the AFE chip U1; the other end of the resistor R3 is connected to one end of the resistor R8 and one end of the resistor R5; the other end of the resistor R8 is connected to the other end of the capacitor C5, one end of the capacitor C9 and the AFE chip U1; the other end of the resistor R5 is connected to one end of the resistor R10 and one end of the resistor R11; the other end of the resistor R10 is connected to the other end of the capacitor C9, one end of the capacitor C10 and the AFE chip U1; the other end of the resistor R9 is connected to one end of the resistor R12 and one end of the resistor R11; the other end of the resistor R12 is connected to the other end of the capacitor C10, one end of the capacitor C12 and the AFE chip U1; the other end of the resistor R11 is connected to one end of the resistor R16 and one end of the resistor R19; the other end of the resistor R16 is connected to the other end of the capacitor C12, one end of the capacitor C13 and the AFE chip U1; the other end of the resistor R19 is connected to one end of the resistor R20 and one end of the resistor R24; the other end of the resistor R20 is connected to the other end of the capacitor C13, one end of the capacitor C17 and the AFE chip U1; the other end of the resistor R24 is connected to one end of the resistor R25 and one end of the resistor R29; the other end of the resistor R25 is connected to the other end of the capacitor C17, one end of the capacitor C19 and the AFE chip U1; the other end of the resistor R29 is connected to one end of the resistor R26 and one end of the resistor R33; the other end of the resistor R26 is connected to the other end of the capacitor C19, one end of the capacitor C20 and the AFE chip U1; the other end of the resistor R33 is connected to one end of the resistor R30 and one end of the resistor R37; the other end of the resistor R30 is connected to the other end of the capacitor C20, one end of the capacitor C22 and the AFE chip U1; one end of the resistor R37 is connected to one end of the resistor R31 and one end of the resistor R38; the other end of the resistor R38 is grounded; the other end of the resistor R31 is connected to the other end of the capacitor C22, one end of the capacitor C26, the negative electrode of the diode D4 and the AFE chip U1; the other end of the capacitor C26 is connected to one end of the resistor R34, one end of the capacitor C29, the negative electrode of the diode D3 and the AFE chip U1; the other end of the resistor R34 is connected to one end of the resistor R36.The other end of the resistor R36 is connected to the other end of the capacitor C29, the positive electrode of the diode D3 and the positive electrode of the diode D4, and grounded. The voltage acquisition module 110 is used to acquire the voltage of the lead-acid battery. The resistors R3, R5, R9, R11, R19, R24, R29, R33, R37 and R38 are in series voltage division mode, analog single cell voltage, and are respectively connected in series with the resistors R6, R8, R10, R12, R16, R20, R25, R26, R30, R31 and R34 to the AFE chip U1 voltage acquisition pin to acquire voltage; the capacitors C5, C9, C10, C12, C13, C17, C19, C20, C22, C26 and C29 play a filtering role. The voltage acquisition module 110 can ensure that the lead-acid battery works in the normal voltage range, and avoid damage to the lead-acid battery caused by excessively high or low voltage.

[0028] The circuit of the current acquisition module 120 is as shown in Figure 2 The current acquisition module 120 includes current sampling resistors RS1, RS2, RS3, RS4, capacitors C25, C27, C28, resistors R32, R35, R39 and R40; one end of the capacitor C25 is connected to one end of the capacitor C27, one end of the resistor R35 and the AFE chip U1; the other end of the resistor R35 is connected to one end of the current sampling resistor RS1, one end of the current sampling resistor RS2, one end of the current sampling resistor RS3, one end of the current sampling resistor RS4, one end of the resistor R39 and one end of the resistor R40, and connected to the negative electrode B- of the lead-acid battery; the other end of the resistor R39 is connected to the other end of the resistor R40 and grounded; the other end of the capacitor C25 is connected to one end of the capacitor C28, one end of the resistor R32 and the AFE chip U1; the other end of the resistor R32 is connected to the other end of the current sampling resistor RS1, the other end of the current sampling resistor RS2, the other end of the current sampling resistor RS3 and the other end of the current sampling resistor RS4, and grounded; the other end of the capacitor C27 is connected to the other end of the capacitor C28 and grounded. The current acquisition module 120 is used to acquire the current of the lead-acid battery, which can prevent the battery from overheating or being damaged due to excessive current.

[0029] The circuit of the communication module 140 is as shown in Figure 4As shown, the communication module 140 includes resistors R13, R14, R17, R18, R21, R23, diode D2, capacitor C14 and capacitor C16; one end of the resistor R13 is connected to the AFE chip U1, and the other end of the resistor R13 is connected to one end of the resistor R14; the other end of the resistor R14 is connected to one end of the resistor R18 and one end of the resistor R21, and is connected to a 3.3V voltage source; one end of the resistor R17 is connected to the AFE chip U1, and the other end of the resistor R17 is connected to the other end of the resistor R18; one end of the capacitor C14 is connected to the AFE chip U1; one end of the capacitor C16 is connected to the AFE chip U1; the other end of the capacitor C14 is connected to the other end of the capacitor C16 and grounded; one end of the resistor R23 is connected to the AFE chip U1, and the other end of the resistor R23 is connected to the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the other end of the resistor R21 and the MCU chip U2. The resistor R14 is a pull-up resistor. The communication module 140 is used for communication between the AFE chip U1 and the MCU chip U2. Through the communication module 140, the AFE acquisition module 100 transmits the collected temperature, current and voltage information to the MCU control module 200.

[0030] The circuit of the power module 150 is as shown in Figure 5 As shown, the power module 150 includes diode D34, transistor Q1, resistor R4, resistor R7, and capacitor C3, capacitor C6, capacitor C7, capacitor C8 and capacitor C43; the positive electrode of the diode D34 is connected to a voltage source; the negative electrode of the diode D34 is connected to the collector of the transistor Q1; the base of the transistor Q1 is connected to one end of the capacitor C3 and one end of the resistor R4; the other end of the resistor R4 is connected to one end of the capacitor C43 and the AFE chip U1; the other end of the capacitor C43 is connected to the other end of the capacitor C3 and grounded; the emitter of the transistor Q1 is connected to one end of the capacitor C6, one end of the capacitor C8 and one end of the resistor R7; the other end of the resistor R7 is connected to one end of the capacitor C7 and outputs a 5V voltage source; the other end of the capacitor C6 is connected to the other end of the capacitor C8 and the other end of the capacitor C7, and is grounded. The power module 150 is used to output a 5V voltage source.

[0031] The circuit of the charging control module 210 is as shown in Figure 7As shown, the charging control module 210 includes diode D26, diode D27, diode D28, diode D29, zener diode DZ4, zener diode DZ5, MOS tube Q4, MOS tube M6, MOS tube M7, MOS tube M8, MOS tube M9, MOS tube M10, MOS tube M11, TVS tube TVS8, TVS tube TVS9, triode Q13, triode Q19, resistor R47, resistor R53, resistor R61, resistor R63, resistor R95, resistor R140, resistor R141, resistor R142, resistor R143, resistor R144, resistor R145, resistor R146, resistor R147, resistor R150, resistor R152, capacitor C44 and capacitor C85; the source of the MOS tube Q4 is connected to the AFE chip U1, the gate of the MOS tube Q4 is connected to one end of the resistor R47, the other end of the resistor R47 is connected to the positive pole B+ of the lead-acid battery; the drain of the MOS tube Q4 is connected to one end of the resistor R152, the other end of the resistor R152 is connected to the positive pole of the diode D28 and the positive pole of the diode D29; the negative pole of the diode D29 is connected to the positive pole of the diode D27, the base of the triode Q19 and one end of the resistor R143; the other end of the resistor R143 is connected to the port F+, one end of the resistor R53, the positive pole of the zener diode DZ4, the source of the MOS tube M7, the source of the MOS tube M9 and the source of the MOS tube M11; the negative pole of the diode D27 is connected to the emitter of the triode Q19, the negative pole of the zener diode DZ4, one end of the resistor R140, one end of the resistor R142 and one end of the resistor R144; the collector of the triode Q19 is connected to the other end of the resistor R53; the other end of the resistor R140 is connected to the gate of the MOS tube M7; the other end of the resistor R142 is connected to the gate of the MOS tube M9; the other end of the resistor R144 is connected to the gate of the MOS tube M11; the drain of the MOS tube M7 is connected to the drain of the MOS tube M9, the drain of the MOS tube M11, the drain of the MOS tube M6, the drain of the MOS tube M8, the drain of the MOS tube M10 and one end of the TVS tube TVS7; the other end of the TVS tube TVS7 is connected to the source of the MOS tube M6, the source of the MOS tube M8, the source of the MOS tube M10, the positive pole of the zener diode DZ5, one end of the resistor R150, one end of the resistor R146, one end of the capacitor C85, the negative pole of the TVS tube TVS9, one end of the resistor R63 and one end of the resistor R61, and is connected with the charging port C+; the gate of the MOS tube M10 is connected to one end of the resistor R147; the gate of the MOS tube M8 is connected to one end of the resistor R145; the gate of the MOS tube M6 is connected to one end of the resistor R141; the other end of the resistor R147 is connected to the other end of the resistor R145, the other end of the resistor R141, the negative pole of the zener diode DZ5, the emitter of the triode Q13 and the negative pole of the diode D26;The anode of the diode D26 is connected to the cathode of the diode D28, the base of the triode Q13 and the other end of the resistor R146; the collector of the triode Q13 is connected to the other end of the resistor R150; the other end of the capacitor C85 is connected to the anode of the TVS tube TVS9 and the other end of the resistor R63, and grounded; the other end of the resistor R61 is connected to one end of the resistor R95; the other end of the resistor R95 is connected to the cathode of the TVS tube TVS8 and one end of the capacitor C44; the anode of the TVS tube TVS8 is connected to the other end of the capacitor C44, and grounded. The MOS tube M7, the MOS tube M9 and the MOS tube M11 are charging MOS tubes; the MOS tube M6, the MOS tube M8 and the MOS tube M10 are discharging MOS tubes. When a high voltage is input to the charging port C+, the diode D28 can play a role of cut-off, protecting the MOS tubes in the circuit and the lead-acid battery.

[0032] The opening principle of the charging control module 210: the CHG pin of the AFE chip U1 outputs a high-level signal, and the MOS tube Q4 is in a conductive state when the CHG signal level is higher than the positive B+ level of the lead-acid battery, and the resistor R152, the diode D29, the diode D27, the resistor R140, the resistor R142 and the resistor R144 are connected to the gates of the MOS tube M7, the MOS tube M9 and the MOS tube M11, so that the MOS tube M7, the MOS tube M9 and the MOS tube M11 are turned on, and at the same time, the CHG signal is connected to the gates of the MOS tube M6, the MOS tube M8 and the MOS tube M10 through the diode D28, the diode D26, the resistor R141, the resistor R145 and the resistor R147, so that the MOS tube M6, the MOS tube M8 and the MOS tube M10 are turned on, and the charging control module 210 is completely opened, and the current flows from the charging port C+ to the port F+.

[0033] The closing principle of the charging control module 210: the CHG pin of the AFE chip U1 outputs a low-level signal, and the MOS tube Q4 is disconnected when the CHG signal level is lower than the gate level of the MOS tube Q4, and the MOS tube Q4 is disconnected, and the gate level of the MOS tube Q4 is lowered, and the MOS tube M7, the MOS tube M9 and the MOS tube M11 of the charging control module 210 are closed, and the MOS tube M6, the MOS tube M8 and the MOS tube M10 of the charging control module 210 are closed, and the charging control module 210 is completely closed.

[0034] The circuit of the discharging control module 220 is as follows Figure 8As shown, the discharge control module 220 includes resistor R98, resistor R99, resistor R100, resistor R102, resistor R155, resistor R156, resistor R157, resistor R158, resistor R159, resistor R160, resistor R161, resistor R164, resistor R166, resistor R168, MOS tube M12, MOS tube M13, MOS tube M14, MOS tube M15, MOS tube Q21, voltage stabilizing diode DZ6, voltage stabilizing diode DZ7, diode D29, diode D30, diode D31, diode D32, triode Q15, triode Q22, capacitor C87, capacitor C89, capacitor C90, TVS tube TVS10, TVS tube TVS11, and TVS tube TVS12; one end of the resistor R168 is connected to the AFE chip U1, and the other end of the resistor R168 is connected to the emitter of the triode Q22; the base of the triode Q22 is connected to one end of the resistor R166, and the other end of the resistor R166 is connected to the positive electrode of the diode D31, and the negative electrode of the diode D31 is connected to one end of the resistor R102, the negative electrode of the TVS tube TVS11, and one end of the capacitor C90; the positive electrode of the TVS tube TVS11 is connected to the other end of the capacitor C90 and grounded; the collector of the triode Q22 is connected to the positive electrode of the diode D30, and the negative electrode of the diode D30 is connected to the positive electrode of the diode D32, the base of the triode Q15, and one end of the resistor R164; the negative electrode of the diode D32 is connected to the negative electrode of the voltage stabilizing diode DZ7, one end of the resistor R159, one end of the resistor R160, one end of the resistor R157, one end of the resistor R156, one end of the resistor R155, and the emitter of the triode Q15; the collector of the triode Q15 is connected to one end of the resistor R98; the other end of the resistor R98 is connected to the positive electrode of the voltage stabilizing diode DZ7, the source of the MOS tube M15, the source of the MOS tube M14, the source of the MOS tube M13, the source of the MOS tube M12, one end of the TVS tube TVS10, one end of the capacitor C87, the other end of the resistor R164, the source of the MOS tube Q21, one end of the resistor R100, the positive electrode of the voltage stabilizing diode DZ6, one end of the resistor R161, one end of the capacitor C89, one end of the TVS tube TVS12, and one end of the resistor R99, and is connected with the discharge port P+; the drain of the MOS tube M15 is connected to the drain of the MOS tube M14, the drain of the MOS tube M13, the drain of the MOS tube M12, the other end of the TVS tube TVS10, the other end of the capacitor C87, and the port F+; the gate of the MOS tube M15 is connected to the other end of the resistor R160; the gate of the MOS tube M14 is connected to the other end of the resistor R157; the gate of the MOS tube M13 is connected to the other end of the resistor R156; the gate of the MOS tube M12 is connected to the other end of the resistor R155; the other end of the resistor R100 is connected to the other end of the resistor R102;The other end of the resistor R159 is connected to the drain of the MOS tube Q21; the gate of the MOS tube Q21 is connected to the negative electrode of the voltage stabilizing diode DZ6, the other end of the resistor R161 and the negative electrode of the diode D29; the positive electrode of the diode D29 is connected to one end of the resistor R158, and the other end of the resistor R158 is grounded; the other end of the capacitor C89 is connected to the positive electrode of the TVS tube TVS12 and the other end of the resistor R99, and grounded. The MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 are discharge MOS tubes. When the high voltage is input to the discharge port P+, the diode D30 can play a role of cutting off, protecting the MOS tubes in the circuit and the lead-acid battery. When there is negative pressure on the discharge port P+, the voltage of the ground end PACK- is higher than the voltage of the discharge port P+, the MOS tube Q21 is turned on, and the gate and the source of the discharge MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 are short-circuited through the resistor R159, the resistor R155, the resistor R156, the resistor R157 and the resistor R160, so as to eliminate the negative pressure.

[0035] The opening principle of the discharge control module 220 is that the DSG pin of the AFE chip U1 outputs a high level signal, which is connected to the emitter of the triode Q22 through the resistor R168. At this time, the emitter level of the triode Q22 is higher than the base level of the triode Q22, the triode Q22 is turned on, the DSG signal is connected to the gate of the MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 through the diode D30 and the diode D32 and the resistor R155, the resistor R156, the resistor R157 and the resistor R160, so as to make the MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 conduct, and the discharge control module 220 is fully opened, and the current can flow from the port F+ to the discharge port P+.

[0036] The closing principle of the discharge control module 220 is that the DSG pin of the AFE chip U1 outputs a low level signal, which is connected to the emitter of the triode Q22 through the resistor R168. At this time, the emitter level of the triode Q22 is lower than the base level of the triode Q22, the triode Q22 is turned off, the gate level of the MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 is low, so as to make the MOS tube M12, the MOS tube M13, the MOS tube M14 and the MOS tube M15 close, and the discharge control module 220 is fully closed.

[0037] The circuit of the protection module 230 is as follows Figure 9As shown, the protection module 230 includes a fuse F2, a three-terminal fuse F3, a resistor R2, a resistor R57, a resistor R148, a resistor R149, a capacitor C86, a diode D25 and a MOS tube M16;One end of the fuse F2 is connected to the power input;The other end of the fuse F2 is connected to one end of the resistor R2 and one fuse end of the three-terminal fuse F3, and is connected to the port F+;The other fuse end of the three-terminal fuse F3 is connected to the positive electrode B+ of the lead-acid battery;The resistance end of the three-terminal fuse F3 is connected to the drain of the MOS tube M16, the other end of the resistor R2 and one end of the resistor R57;The gate of the MOS tube M16 is connected to one end of the resistor R148, one end of the capacitor C86 and one end of the resistor R149;The source of the MOS tube M16 is connected to the other end of the resistor R57, the other end of the resistor R149 and the other end of the capacitor C86, and is grounded;The other end of the resistor R148 is connected to the negative electrode of the diode D25, and the positive electrode of the diode D25 is connected to the MCU chip U2.The F-CTL pin of the MCU chip U2 outputs high level, which is connected to the gate of the MOS tube M16 through the diode D25 and the resistor R148, so that the MOS tube M16 is turned on, the positive electrode B+ of the lead-acid battery is connected to GND through the fuse F2 and the MOS tube M16, the three-terminal fuse F3 is actively fused, the port F+ and the positive electrode B+ of the lead-acid battery circuit are disconnected, and the lead-acid battery is protected.

[0038] Working principle: in use, the voltage acquisition module 110, the current acquisition module 120 and the NTC acquisition module 130 of the AFE acquisition module 100 acquire voltage, current and temperature information of the lead-acid battery respectively, then the AFE chip U1 transmits the voltage, current and temperature information to the MCU chip U2 of the MCU control module 200 through the communication module 140, and the MCU chip U2 controls the charging and discharging of the lead-acid battery through the control charging module 210 and the discharging control module 220 according to the voltage, current and temperature information;The MCU chip U2 can also actively fuse and disconnect the circuit through the protection module 230, thereby protecting the lead-acid battery;The utility model can monitor the voltage, current and temperature of the lead-acid battery, avoid the lead-acid battery in abnormal state for a long time, and has the advantages of high safety and high stability.

[0039] The above embodiments only express the implementation of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent, and in the embodiment, up, down, left, right, front and back only represent their relative positions and not their absolute positions.It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model.Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A lead-acid battery management circuit, connected to a lead-acid battery, characterized in that: The system includes an AFE acquisition module (100) and an MCU control module (200). The AFE acquisition module (100) includes an AFE chip U1, a voltage acquisition module (110), a current acquisition module (120), an NTC acquisition module (130), a communication module (140), and a power supply module (150). The AFE chip U1 is connected to the voltage acquisition module (110), the current acquisition module (120), the NTC acquisition module (130), the communication module (140), and the power supply module (150). The MCU control module (200) includes an MCU chip U2, a charging control module (210), a discharging control module (220), and a protection module (230). The MCU chip U2 is connected to the protection module (230) and the communication module (140). The AFE chip U1 is connected to the charging control module (210) and the discharging control module (220).

2. The lead-acid battery management circuit according to claim 1, characterized in that: The NTC acquisition module (130) includes capacitors C11, C15, C18, and C21; diodes D7 and D15; resistors R15 and R28; and thermistors NTC2, NTC3, and NTC4. One end of capacitor C11 is connected to AFE chip U1, the negative terminal of diode D7, and one end of resistor R15. The other end of capacitor C11 is connected to the positive terminal of diode D7 and the other end of resistor R15, and is grounded. One end of capacitor C15 is connected to AFE chip U1 and the thermistor NTC2. One end of capacitor C15 is connected to the other end of the thermistor NTC2 and grounded; one end of capacitor C18 is connected to AFE chip U1 and one end of the thermistor NTC3; the other end of capacitor C18 is connected to the other end of the thermistor NTC3 and grounded; one end of capacitor C21 is connected to AFE chip U1, one end of resistor R28, the negative terminal of diode D15 and one end of the thermistor NTC4; the other end of capacitor C21 is connected to the other end of resistor R28, the positive terminal of diode D15 and the other end of the thermistor NTC4 and grounded.

3. The lead-acid battery management circuit according to claim 2, characterized in that: The voltage acquisition module (110) includes resistors R3, R5, R6, R8, R9, R10, R11, R12, R16, R19, R20, R24, R25, R26, R29, R30, R31, R33, R34, R37, and R38; capacitors C5, C9, C10, C12, C13, C17, C19, C20, C22, C26, and C29; diodes D3 and D4; one end of resistor R3 is connected to one end of resistor R6 and is connected to port F+; the other end of resistor R6 is connected to one end of capacitor C5 and AFE chip U1; The other end of resistor R3 is connected to one end of resistor R8 and one end of resistor R5; the other end of resistor R8 is connected to the other end of capacitor C5, one end of capacitor C9 and AFE chip U1; The other end of resistor R5 is connected to one end of resistor R10 and one end of resistor R11; the other end of resistor R10 is connected to the other end of capacitor C9, one end of capacitor C10, and AFE chip U1; The other end of resistor R9 is connected to one end of resistor R12 and one end of resistor R11; the other end of resistor R12 is connected to the other end of capacitor C10, one end of capacitor C12, and AFE chip U1; the other end of resistor R11 is connected to one end of resistor R16 and one end of resistor R19; the other end of resistor R16 is connected to the other end of capacitor C12, one end of capacitor C13, and AFE chip U1; the other end of resistor R19 is connected to one end of resistor R20 and one end of resistor R24; the resistor The other end of resistor R20 is connected to the other end of capacitor C13, one end of capacitor C17, and AFE chip U1; the other end of resistor R24 ​​is connected to one end of resistor R25 and one end of resistor R29; the other end of resistor R25 is connected to the other end of capacitor C17, one end of capacitor C19, and AFE chip U1; the other end of resistor R29 is connected to one end of resistor R26 and one end of resistor R33; the other end of resistor R26 is connected to the other end of capacitor C19, one end of capacitor C20, and AFE chip U1; The other end of resistor R33 is connected to one end of resistor R30 and one end of resistor R37; the other end of resistor R30 is connected to the other end of capacitor C20, one end of capacitor C22, and AFE chip U1; One end of resistor R37 is connected to one end of resistor R31 and one end of resistor R38; the other end of resistor R38 is grounded; the other end of resistor R31 is connected to the other end of capacitor C22, one end of capacitor C26, the cathode of diode D4, and AFE chip U1; the other end of capacitor C26 is connected to one end of resistor R34, one end of capacitor C29, the cathode of diode D3, and AFE chip U1. The other end of resistor R34 is connected to one end of resistor R36; the other end of resistor R36 is connected to the other end of capacitor C29, the positive terminal of diode D3 and the positive terminal of diode D4, and is grounded.

4. The lead-acid battery management circuit according to claim 3, characterized in that: The current acquisition module (120) includes current sampling resistors RS1, RS2, RS3, and RS4, capacitors C25, C27, and C28, resistors R32, R35, R39, and 40; one end of capacitor C25 is connected to one end of capacitor C27, one end of resistor R35, and AFE chip U1; The other end of resistor R35 is connected to one end of current sampling resistor RS1, one end of current sampling resistor RS2, one end of current sampling resistor RS3, one end of current sampling resistor RS4, one end of resistor R39, and one end of resistor R40, and is connected to the negative terminal B- of lead-acid battery; the other end of resistor R39 is connected to the other end of resistor R40 and grounded; the other end of capacitor C25 is connected to one end of capacitor C28, one end of resistor R32, and AFE chip U1; The other end of resistor R32 is connected to the other ends of current sampling resistors RS1, RS2, RS3 and RS4, and grounded; the other end of capacitor C27 is connected to the other end of capacitor C28, and grounded.

5. The lead-acid battery management circuit according to claim 4, characterized in that: The communication module (140) includes resistors R13, R14, R17, R18, R21, R23, diode D2, capacitor C14, and capacitor C16. One end of resistor R13 is connected to AFE chip U1, and the other end of resistor R13 is connected to one end of resistor R14. The other end of resistor R14 is connected to one end of resistor R18 and one end of resistor R21, and is connected to a 3.3V voltage source. One end of resistor R17 is connected to AFE chip U1, and the other end of resistor R17 is connected to the other end of resistor R18. One end of capacitor C14 is connected to AFE chip U1. One end of capacitor C16 is connected to AFE chip U1. The other end of capacitor C14 is connected to the other end of capacitor C16 and is grounded. One end of resistor R23 is connected to AFE chip U1, and the other end of resistor R23 is connected to the negative terminal of diode D2. The positive terminal of diode D2 is connected to the other end of resistor R21 and MCU chip U2.

6. The lead-acid battery management circuit according to claim 5, characterized in that: The power module (150) includes a diode D34, a transistor Q1, resistors R4 and R7, and capacitors C3, C6, C7, C8, and C43. The anode of diode D34 is connected to a voltage source. The cathode of diode D34 is connected to the collector of transistor Q1. The base of transistor Q1 is connected to one end of capacitor C3 and one end of resistor R4. The other end of resistor R4 is connected to one end of capacitor C43 and AFE chip U1. The other end of capacitor C43 is connected to the other end of capacitor C3 and grounded. The emitter of transistor Q1 is connected to one end of capacitor C6, one end of capacitor C8, and one end of resistor R7. The other end of resistor R7 is connected to one end of capacitor C7 and outputs a 5V voltage source. The other end of capacitor C6 is connected to the other ends of capacitor C8 and capacitor C7 and grounded.

7. The lead-acid battery management circuit according to claim 6, characterized in that: The charging control module (210) includes diodes D26, D27, D28, and D29; Zener diodes DZ4 and DZ5; MOSFETs Q4, M6, M7, M8, M9, M10, and M11; TVS diodes TVS8 and TVS9; transistors Q13 and Q19; resistors R47, R53, R61, R63, R95, R140, R141, R142, R143, R144, R145, R146, R147, R150, and R152; and capacitor C4. 4 and capacitor C85; the source of the MOSFET Q4 is connected to the AFE chip U1, the gate of the MOSFET Q4 is connected to one end of resistor R47, and the other end of resistor R47 is connected to the positive terminal B+ of the lead-acid battery; the drain of the MOSFET Q4 is connected to one end of resistor R152, and the other end of resistor R152 is connected to the anode of diode D28 and the anode of diode D29; the cathode of diode D29 is connected to the anode of diode D27, the base of transistor Q19, and one end of resistor R143; the other end of resistor R143 is connected to port F+, one end of resistor R53, the anode of Zener diode DZ4, the source of MOSFET M7, the source of MOSFET M9, and the source of MOSFET M11; the diode D27 The negative terminal is connected to the emitter of transistor Q19, the negative terminal of Zener diode DZ4, one end of resistor R140, one end of resistor R142, and one end of resistor R144; the collector of transistor Q19 is connected to the other end of resistor R53; the other end of resistor R140 is connected to the gate of MOSFET M7; the other end of resistor R142 is connected to the gate of MOSFET M9; the other end of resistor R144 is connected to the gate of MOSFET M11; the drain of MOSFET M7 is connected to the drains of MOSFETs M9, M11, M6, M8, and M10, and one end of TVS transistor TVS7; the other end of TVS transistor TVS7 is connected to M... The source of MOSFET M6, the source of MOSFET M8, the source of MOSFET M10, the positive terminal of Zener diode DZ5, one end of resistor R150, one end of resistor R146, one end of capacitor C85, the negative terminal of TVS transistor TVS9, one end of resistor R63, and one end of resistor R61 are connected to the charging port C+; the gate of MOSFET M10 is connected to one end of resistor R147; the gate of MOSFET M8 is connected to one end of resistor R145; the gate of MOSFET M6 is connected to one end of resistor R141; the other end of resistor R147 is connected to the other end of resistor R145, the other end of resistor R141, the negative terminal of Zener diode DZ5, the transmitter of transistor Q13, and the negative terminal of diode D26.The anode of diode D26 is connected to the cathode of diode D28, the base of transistor Q13, and the other end of resistor R146; the collector of transistor Q13 is connected to the other end of resistor R150; the other end of capacitor C85 is connected to the anode of TVS transistor TVS9 and the other end of resistor R63, and grounded; the other end of resistor R61 is connected to one end of resistor R95; the other end of resistor R95 is connected to the cathode of TVS transistor TVS8 and one end of capacitor C44; the anode of TVS transistor TVS8 is connected to the other end of capacitor C44, and grounded.

8. The lead-acid battery management circuit according to claim 7, characterized in that: The discharge control module (220) includes resistors R98, R99, R100, R102, R155, R156, R157, R158, R159, R160, R161, R164, R166, and R168; MOSFETs M12, M13, M14, M15, and Q21; Zener diodes DZ6 and DZ7; diodes D29, D30, D31, and D32; transistor Q15; transistor Q22; capacitors C87, C89, and C90; and TVS diodes TVS10 and TVS diodes TVS1 and TVS1, ... S11 and TVS transistor TVS12; one end of resistor R168 is connected to AFE chip U1, and the other end of resistor R168 is connected to the emitter of transistor Q22; the base of transistor Q22 is connected to one end of resistor R166, the other end of resistor R166 is connected to the anode of diode D31, the cathode of diode D31 is connected to one end of resistor R102, the cathode of TVS transistor TVS11, and one end of capacitor C90; the anode of TVS transistor TVS11 is connected to the other end of capacitor C90 and grounded; the collector of transistor Q22 is connected to the anode of diode D30, the cathode of diode D30 is connected to the anode of diode D32, the base of transistor Q15, and one end of resistor R164; the diode... The negative terminal of transistor D32 is connected to the negative terminal of Zener diode DZ7, one end of resistor R159, one end of resistor R160, one end of resistor R157, one end of resistor R156, one end of resistor R155, and the emitter of transistor Q15; the collector of transistor Q15 is connected to one end of resistor R98; the other end of resistor R98 is connected to the positive terminal of Zener diode DZ7, the source of MOSFET M15, the source of MOSFET M14, the source of MOSFET M13, the source of MOSFET M12, one end of TVS diode TVS10, one end of capacitor C87, the other end of resistor R164, the source of MOSFET Q21, one end of resistor R100, the positive terminal of Zener diode DZ6, and resistor R16. One end of resistor R100, one end of capacitor C89, one end of TVS transistor TVS12, and one end of resistor R99 are connected to the discharge port P+. The drain of MOSFET M15 is connected to the drains of MOSFET M14, MOSFET M13, and MOSFET M12, the other end of TVS transistor TVS10, the other end of capacitor C87, and port F+. The gate of MOSFET M15 is connected to the other end of resistor R160. The gate of MOSFET M14 is connected to the other end of resistor R157. The gate of MOSFET M13 is connected to the other end of resistor R156. The gate of MOSFET M12 is connected to the other end of resistor R155. The other end of resistor R100 is connected to the other end of resistor R102.The other end of resistor R159 is connected to the drain of MOSFET Q21; the gate of MOSFET Q21 is connected to the cathode of Zener diode DZ6, the other end of resistor R161, and the cathode of diode D29; the anode of diode D29 is connected to one end of resistor R158, and the other end of resistor R158 is grounded; the other end of capacitor C89 is connected to the anode of TVS diode TVS12 and the other end of resistor R99, and is also grounded.

9. The lead-acid battery management circuit according to claim 1, characterized in that: The protection module (230) includes a fuse F2, a three-terminal fuse F3, resistors R2, R57, R148, R149, capacitor C86, diode D25, and MOSFET M16; one end of fuse F2 is connected to the power input; the other end of fuse F2 is connected to one end of resistor R2 and one fuse terminal of the three-terminal fuse F3, and connected to port F+; the other fuse terminal of the three-terminal fuse F3 is connected to the positive terminal B+ of the lead-acid battery; the three-terminal fuse F3... The resistor terminal is connected to the drain of MOSFET M16, the other end of resistor R2, and one end of resistor R57; the gate of MOSFET M16 is connected to one end of resistor R148, one end of capacitor C86, and one end of resistor R149; the source of MOSFET M16 is connected to the other end of resistor R57, the other end of resistor R149, and the other end of capacitor C86, and is grounded; the other end of resistor R148 is connected to the cathode of diode D25, and the anode of diode D25 is connected to MCU chip U2.

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