Lead-acid battery status online monitoring system

Abstract

The present invention provides an online monitoring system for the state of a lead-acid battery, comprising a detection control unit, a processing unit and a remote unit; the detection control unit comprises a temperature detection module, a discharge information detection module, an internal resistance detection module and a bulge detection control module; the detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module are connected to the detection input end of the processing unit, the first control end con1 of the processing unit is connected to the first control input end of the bulge detection control module, the second control end con2 of the processing unit is connected to the second control input end of the bulge detection control module, and the bulge detection control module controls the on-off of the discharge circuit of the lead-acid battery; the processing unit is connected to the remote unit for communication; and the state of the lead-acid battery can be monitored in real time and comprehensively.

Description

Technical Field

[0001] The invention relates to the field of lead-acid batteries, and in particular to an online monitoring system for the state of a lead-acid battery. Background Art

[0002] Lead-acid batteries are widely used in modern industrial production and life due to their stable voltage, low price and high reliability. However, lead-acid batteries require frequent maintenance in actual use. In the prior art, the maintenance and inspection of lead-acid batteries are generally carried out at a set time (the set time is a fixed cycle. If it is a new lead-acid battery, then this cycle is longer. If the lead-acid battery has been in service for a long time, then the maintenance and inspection cycle is shorter). However, this method cannot guarantee that the lead-acid battery can be in a stable and reliable state between two adjacent maintenances; although the prior art has an online detection method for the status of the lead-acid battery, the online monitoring of the prior art is not comprehensive.

[0003] Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an online monitoring system for the status of a lead-acid battery, which can monitor the status of the lead-acid battery in real time and comprehensively, upload the monitoring data in real time, and cut off the battery output in time when the lead-acid battery is bulging or the operating temperature is too high, thereby effectively ensuring the safety of the use of the lead-acid battery.

[0005] The present invention provides an online monitoring system for the state of a lead-acid battery, comprising a detection control unit, a processing unit and a remote unit for detecting state information of the lead-acid battery;

[0006] The detection control unit includes a temperature detection module, a discharge information detection module, an internal resistance detection module and a bulge detection control module;

[0007] The detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module are connected to the detection input end of the processing unit, the first control end con1 of the processing unit is connected to the first control input end of the bulge detection control module, the second control end con2 of the processing unit is connected to the second control input end of the bulge detection control module, and the bulge detection control module controls the on and off of the discharge circuit of the lead-acid battery;

[0008] The processing unit is communicatively coupled to a remote unit.

[0009] Further, the bulge detection control module includes a bulge detection device and a bulge detection control circuit;

[0010] The bulge detection device comprises a fixing plate and a breathable insulating film;

[0011] The fixing plate is fixedly arranged between adjacent single cells of the lead-acid storage battery, and a plurality of thin film electrode sheets are arranged on both sides of the fixing plate;

[0012] The insulating film is attached to the single cell, and the insulating film is provided with a plurality of thin film electrode sheets, the thin film electrode sheets of the insulating film are directly opposite to the thin film electrode sheets on the side of the fixed plate facing the insulating film, and the two directly opposite thin film electrode sheets form a detection capacitor;

[0013] The bulge detection control circuit is used to detect the capacitance change state of the detection capacitor, control the on and off of the discharge circuit of the lead-acid battery according to the capacitance change state of the detection capacitor, and output the capacitance change state to the processing unit.

[0014] Further, the bulge detection control circuit includes an input control circuit, a detection circuit and a comparison control circuit;

[0015] The control input end of the input control circuit is connected to the first control end con1 of the processing unit, the power input end of the input control circuit is connected to the DC power supply VDD, the power output end of the input control circuit supplies power to the detection circuit and the comparison control circuit, the detection input end of the comparison control circuit is connected to the first output end of the detection circuit, the comparison control circuit is used to control the on and off of the discharge circuit of the lead-acid battery, the control input end of the comparison control circuit is connected to the second control end of the processing unit, the power end of the comparison control circuit is connected to the power output end of the input control circuit, and the power end of the detection circuit is connected to the power output end of the input control circuit.

[0016] Further, the detection circuit includes a resistor R4, a detection capacitor Ct, a capacitor C1, a resistor R6, a resistor R7, a resistor R13 and a capacitor C2;

[0017] One end of the resistor R4 serves as a power supply end of the detection circuit, the other end of the resistor R4 is connected to one end of the capacitor C1 through the detection capacitor Ct, the other end of the capacitor C1 is grounded, the common connection point between the detection capacitor Ct and the capacitor C1 is connected to one end of the resistor R7, the other end of the resistor R7 serves as a first output end of the detection circuit, one end of the resistor R6 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point between the resistor R6 and the capacitor C2 serves as a second output end of the detection circuit and is connected to the detection input end of the processing unit, one end of the resistor R13 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, and the other end of the resistor R13 serves as a third output end of the detection circuit.

[0018] Further, the comparison control circuit includes a resistor R5, a resistor R8, a capacitor C3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a comparator U1, a transistor Q4, an NMOS tube Q2, a diode D1, a diode D2, a comparator U2, a resistor R14, an OR gate circuit U3 and a DC contactor;

[0019] One end of the resistor R10 is connected to the power output end of the input control circuit as the power supply end of the comparison control circuit, and the other end of the resistor R10 is connected to the drain of the NMOS tube Q2. The source of the NMOS tube Q2 is grounded through the excitation coil L1 of the DC contactor. The normally closed switch of the DC contactor is set at the output end of the lead-acid battery.

[0020] The in-phase end of the comparator U1 is used as the detection input end of the comparison control circuit, the inverting end of the comparator U1 is connected to the power output end of the input control circuit through the resistor R5, the inverting end of the comparator U1 is connected to the ground through the resistor R8 and the capacitor C3 in parallel, the output end of the comparator U1 is connected to the first input end of the OR gate circuit through the resistor R11, the inverting end of the comparator U2 is connected to the common connection point between the resistor R5 and the resistor R8, the in-phase end of the comparator U2 is connected to the third output end of the detection circuit, and the output end of the comparator U2 is connected to the OR gate through the resistor R14. The second input end of the circuit, or the output end of the gate circuit, is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the base of the transistor Q4, the cathode of the diode D2 is connected to the base of the transistor Q4, the anode of the diode D2 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the second control output end con2 of the processing unit as the control input end of the comparison control circuit; the emitter of the transistor Q4 is connected to the gate of the NMOS tube Q2, and the collector of the transistor Q4 is connected to the power output end of the input control circuit through the resistor R9.

[0021] Further, the input control circuit includes a resistor R1, a resistor R2, a resistor R3, a PMOS transistor Q1 and a transistor Q2;

[0022] The source of the PMOS tube Q1 serves as the power input terminal of the input control circuit, the drain of the PMOS tube Q1 serves as the power output terminal of the input control circuit, the gate of the PMOS tube Q1 is connected to the source of the PMOS tube Q1 through the resistor R1, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to one end of the resistor R3, and the other end of the resistor R3 serves as the control input terminal of the input control circuit.

[0023] Further, the processing unit includes a pre-processing circuit, a central processing circuit, a memory and a transmission module;

[0024] The input end of the preprocessing circuit is connected to the detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module, the output end of the preprocessing circuit is connected to the central processing circuit, the first control end con1 of the central processing circuit is connected to the first control input end of the bulge detection control circuit, the second control end con2 of the central processing circuit is connected to the second control input end of the bulge detection control circuit, and the central processing circuit is communicatively connected to the remote unit through the transmission module.

[0025] Further, the remote unit includes a monitoring host, an audible and visual alarm, and input and output devices;

[0026] The monitoring host is connected to the sound and light alarm, the monitoring host is connected to the input and output equipment, and the monitoring host is communicatively connected to the processing unit.

[0027] The beneficial effects of the present invention are as follows: Through the present invention, the status of the lead-acid battery can be monitored in real time and comprehensively, and the monitoring data can be uploaded in real time, and the battery output can be cut off in time when the lead-acid battery is bulging or the operating temperature is too high, thereby effectively ensuring the safety of the lead-acid battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the bulge detection control module of the present invention.

[0031] Figure 3 It is a schematic diagram of the fixing plate structure of the present invention.

[0032] Figure 4 It is a schematic diagram of the insulating film structure of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0034] The present invention provides an online monitoring system for the state of a lead-acid battery, comprising a detection control unit, a processing unit and a remote unit for detecting state information of the lead-acid battery;

[0035] The detection control unit includes a temperature detection module, a discharge information detection module, an internal resistance detection module and a bulge detection control module;

[0036] The detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module are connected to the detection input end of the processing unit, the first control end con1 of the processing unit is connected to the first control input end of the bulge detection control module, the second control end con2 of the processing unit is connected to the second control input end of the bulge detection control module, and the bulge detection control module controls the on and off of the discharge circuit of the lead-acid battery;

[0037] The processing unit is connected to the remote unit for communication. The temperature detection module uses an existing temperature sensor to detect the working temperature of the lead-acid battery. The discharge information detection module includes a voltage sensor, a voltage acquisition circuit and a current sensor. The voltage sensor is used to detect the discharge voltage of the lead-acid battery. The voltage acquisition circuit is used to detect the charged voltage of the lead-acid battery when it is at rest. The voltage acquisition circuit uses an existing acquisition circuit. The current sensor is used to detect the discharge current of the lead-acid battery.

[0038] The internal resistance detection module adopts the existing internal resistance detection circuit, and its structure and principle are not described in detail here; through the above structure, the status of the lead-acid battery can be monitored in real time and comprehensively, and the monitoring data can be uploaded in real time, and the battery output can be cut off in time when the lead-acid battery is bulging or the operating temperature is too high, thereby effectively ensuring the safety of the lead-acid battery.

[0039] In this embodiment, the bulge detection control module includes a bulge detection device and a bulge detection control circuit;

[0040] The bulge detection device comprises a fixing plate 3 and a breathable insulating film 1;

[0041] The fixing plate 3 is fixedly arranged between adjacent single cells of the lead-acid battery, and a plurality of thin film electrode sheets 4 are arranged on both sides of the fixing plate 3;

[0042] The insulating film 2 is attached to the single cell, and the insulating film 2 is provided with a plurality of thin film electrode sheets 1, and the thin film electrode sheets of the insulating film are directly opposite to the thin film electrode sheets on the side of the fixed plate facing the insulating film, and the two directly opposite thin film electrode sheets form a detection capacitor;

[0043] The bulge detection control circuit is used to detect the capacitance change state of the detection capacitor, control the discharge circuit of the lead-acid battery to be on and off according to the capacitance change state of the detection capacitor, and output the capacitance change state to the processing unit. The lead-acid battery is generally composed of a plurality of single cells, and there is a gap between two adjacent single cells, and the fixed plate is arranged in the gap. For the two single cells at both ends of the entire lead-acid battery, the fixed plate is arranged in the gap between the single cell and the shell of the battery pack; through the above structure, the two film electrode sheets facing each other form a capacitor, according to the capacitance formula: C = εS / d, where S is the area facing the capacitor plate, d is the distance between the capacitor plates, and ε is the dielectric constant. When the battery bulges, its facing area S will change or the distance d will change, so the capacitance of the capacitor will change (increase or decrease). Therefore, under the above structure, it is possible to accurately detect whether the lead-acid battery has bulge phenomenon. Once bulge occurs, the lead-acid battery is not allowed to be put into use.

[0044] In this embodiment, the bulge detection control circuit includes an input control circuit, a detection circuit and a comparison control circuit;

[0045] The control input end of the input control circuit is connected to the first control end con1 of the processing unit, the power input end of the input control circuit is connected to the DC power supply VDD, the power output end of the input control circuit supplies power to the detection circuit and the comparison control circuit, the detection input end of the comparison control circuit is connected to the first output end of the detection circuit, the comparison control circuit is used to control the on and off of the discharge circuit of the lead-acid battery, the control input end of the comparison control circuit is connected to the second control end of the processing unit, the power end of the comparison control circuit is connected to the power output end of the input control circuit, and the power end of the detection circuit is connected to the power output end of the input control circuit.

[0046] Specifically: the detection circuit includes a resistor R4, a detection capacitor Ct, a capacitor C1, a resistor R6, a resistor R7, a resistor R13 and a capacitor C2;

[0047] One end of the resistor R4 is used as the power supply end of the detection circuit, the other end of the resistor R4 is connected to one end of the capacitor C1 through the detection capacitor Ct, the other end of the capacitor C1 is grounded, the common connection point between the detection capacitor Ct and the capacitor C1 is connected to one end of the resistor R7, the other end of the resistor R7 is used as the first output end of the detection circuit, one end of the resistor R6 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point between the resistor R6 and the capacitor C2 is used as the second output end of the detection circuit and is connected to the detection input end of the processing unit, one end of the resistor R13 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, and the other end of the resistor R13 is used as the third output end of the detection circuit. Among them, the detection circuit is arranged in multiples, matching the logarithm of the thin film electrode sheet;

[0048] The comparison control circuit includes a resistor R5, a resistor R8, a capacitor C3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a comparator U1, a transistor Q4, an NMOS transistor Q2, a diode D1, a diode D2, a comparator U2, a resistor R14, an OR gate circuit U3 and a DC contactor;

[0049] One end of the resistor R10 is connected to the power output end of the input control circuit as the power supply end of the comparison control circuit, and the other end of the resistor R10 is connected to the drain of the NMOS tube Q2. The source of the NMOS tube Q2 is grounded through the excitation coil L1 of the DC contactor. The normally closed switch of the DC contactor is set at the output end of the lead-acid battery.

[0050] The in-phase end of the comparator U1 is used as the detection input end of the comparison control circuit, the inverting end of the comparator U1 is connected to the power output end of the input control circuit through the resistor R5, the inverting end of the comparator U1 is connected to the ground through the resistor R8 and the capacitor C3 in parallel, the output end of the comparator U1 is connected to the first input end of the OR gate circuit through the resistor R11, the inverting end of the comparator U2 is connected to the common connection point between the resistor R5 and the resistor R8, the in-phase end of the comparator U2 is connected to the third output end of the detection circuit, and the output end of the comparator U2 is connected to the OR gate through the resistor R14. The second input end of the circuit, or the output end of the gate circuit, is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the base of the transistor Q4, the cathode of the diode D2 is connected to the base of the transistor Q4, the anode of the diode D2 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the second control output end con2 of the processing unit as the control input end of the comparison control circuit; the emitter of the transistor Q4 is connected to the gate of the NMOS tube Q2, and the collector of the transistor Q4 is connected to the power output end of the input control circuit through the resistor R9.

[0051] The detection capacitor Ct and the capacitor C1 form a series structure. Under the series structure, the terminal voltages of the detection capacitor Ct and the capacitor C1 are inversely proportional to their capacitance values. That is to say, when the capacitance value of the detection capacitor Ct increases, its terminal voltage decreases, thereby the terminal voltage of the capacitor C1 increases. When the capacitance value of Ct decreases, its terminal voltage increases, and the terminal voltage of the capacitor C1 decreases. Therefore, under the structure of the detection circuit, the capacitance change of the capacitor Ct can be identified, thereby judging the bulging situation, and the comparison control circuit is used to compare the situation in normal state. Under normal state, the voltage at the in-phase terminal of the comparator U1 is lower than the voltage at the inverting terminal, and the comparator outputs a low level. The voltage at the in-phase terminal of U2 is higher than the voltage at the inverting terminal, and U2 outputs a low level. At this time, the OR gate outputs a low level, and the transistor Q4 and the NMOS tube Q2 do not act. When the capacitance value of the detection capacitor increases or decreases, how is it reflected in the comparators U1 and U2? If the capacitance value of Ct increases, then When the voltage of capacitor C1 increases, the voltage of the in-phase terminal of comparator U2 is higher than the voltage of the in-phase terminal, and comparator U1 outputs a high level. At this time, comparator U2 outputs a level, or gate circuit U3 outputs a high level. If the capacitance of capacitor Ct decreases, the voltage of capacitor Ct increases, and the terminal voltage of capacitor C1 decreases, which is manifested as comparator U1 outputting a low level, comparator U2 outputting a high level, or gate circuit U3 outputting a high level, transistor Q4 turning on, NMOS tube Q2 turning on, the DC contactor disconnects its normally closed switch, the lead-acid battery does not supply power, is in a stopped working state or remains in a non-working state, thereby avoiding the safety hazard caused by the lead-acid battery still being in a working state at this time; and for the working lead-acid battery, if the central processing circuit determines that the current temperature of the lead-acid battery is too high, that is, greater than the set value, it outputs a high level through resistor R12, so that the DC contactor disconnects its normally closed switch.

[0052] In this embodiment, the input control circuit includes a resistor R1, a resistor R2, a resistor R3, a PMOS transistor Q1 and a transistor Q2;

[0053] The source of the PMOS tube Q1 serves as the power input terminal of the input control circuit, the drain of the PMOS tube Q1 serves as the power output terminal of the input control circuit, the gate of the PMOS tube Q1 is connected to the source of the PMOS tube Q1 through the resistor R1, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to one end of the resistor R3, and the other end of the resistor R3 serves as the control input terminal of the input control circuit. Through the above structure, the central processing circuit controls whether the entire bulge detection control module is in a working state, and the central processing circuit sends corresponding control commands by the remote unit.

[0054] In this embodiment, the processing unit includes a pre-processing circuit, a central processing circuit, a memory and a transmission module;

[0055] The input end of the preprocessing circuit is connected to the detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module, the output end of the preprocessing circuit is connected to the central processing circuit, the first control end con1 of the central processing circuit is connected to the first control input end of the bulge detection control circuit, the second control end con2 of the central processing circuit is connected to the second control input end of the bulge detection control circuit, and the central processing circuit is communicatively connected to the remote unit through the transmission module. Among them, the preprocessing circuit includes an amplification circuit, a filtering circuit and an analog-to-digital conversion circuit connected in sequence, so that each signal is preprocessed and then input into the central processing circuit. The central processing circuit processes and judges these data, and generates corresponding alarm information, such as bulging alarm information, overtemperature alarm information, discharge voltage, discharge current abnormal alarm information, etc. and sends them to the remote unit. Of course, the central processing circuit also sends the received monitoring data to the remote unit. The central processing circuit adopts an existing single-chip microcomputer, and the transmission module adopts an existing module, such as an Ethernet module, and can also be a wireless transmission module, such as a ZigBee module, a mobile communication module (4G or 5G module), etc.; each of the above modules is powered by an existing DC power supply VDD. For the single-chip microcomputer, 5V is generally used for power supply. If VDD is greater than 5V, it is provided after processing by an existing step-down circuit. Generally speaking, VDD adopts the highest rated voltage of the above-mentioned devices. For example, if the operating voltage of the temperature sensor is 9V and it is the highest voltage among all devices, then VDD is 9V.

[0056] In this embodiment, the remote unit includes a monitoring host, an audible and visual alarm, and input and output devices;

[0057] The monitoring host is connected to the sound and light alarm, the monitoring host is connected to the input and output device, and the monitoring host is communicatively connected to the processing unit, wherein the input and output device adopts the existing touch display screen, and can also be formed by a combination of a keyboard, a mouse and a display.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A lead-acid battery status online monitoring system, characterized in that: It includes a detection control unit, a processing unit and a remote unit for detecting the state information of the lead-acid battery; The detection control unit includes a temperature detection module, a discharge information detection module, an internal resistance detection module and a bulge detection control module; The detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module are connected to the detection input end of the processing unit, the first control end con1 of the processing unit is connected to the first control input end of the bulge detection control module, the second control end con2 of the processing unit is connected to the second control input end of the bulge detection control module, and the bulge detection control module controls the on and off of the discharge circuit of the lead-acid battery; The processing unit is communicatively connected to the remote unit; The bulge detection control module includes a bulge detection device and a bulge detection control circuit; The bulge detection device comprises a fixing plate and a breathable insulating film; The fixing plate is fixedly arranged between adjacent single cells of the lead-acid storage battery, and a plurality of thin film electrode sheets are arranged on both sides of the fixing plate; The insulating film is attached to the single cell, and the insulating film is provided with a plurality of thin film electrode sheets, the thin film electrode sheets of the insulating film are directly opposite to the thin film electrode sheets on the side of the fixed plate facing the insulating film, and the two directly opposite thin film electrode sheets form a detection capacitor; The bulge detection control circuit is used to detect the capacitance change state of the detection capacitor, control the on and off of the discharge circuit of the lead-acid battery according to the capacitance change state of the detection capacitor, and output the capacitance change state to the processing unit; The bulge detection control circuit includes an input control circuit, a detection circuit and a comparison control circuit; The control input end of the input control circuit is connected to the first control end con1 of the processing unit, the power input end of the input control circuit is connected to the DC power supply VDD, the power output end of the input control circuit supplies power to the detection circuit and the comparison control circuit, the detection input end of the comparison control circuit is connected to the first output end of the detection circuit, the comparison control circuit is used to control the on-off of the discharge circuit of the lead-acid battery, the control input end of the comparison control circuit is connected to the second control end of the processing unit, the power end of the comparison control circuit is connected to the power output end of the input control circuit, and the power end of the detection circuit is connected to the power output end of the input control circuit; The detection circuit includes a resistor R4, a detection capacitor Ct, a capacitor C1, a resistor R6, a resistor R7, a resistor R13 and a capacitor C2; One end of the resistor R4 serves as a power supply end of the detection circuit, the other end of the resistor R4 is connected to one end of the capacitor C1 through the detection capacitor Ct, the other end of the capacitor C1 is grounded, the common connection point between the detection capacitor Ct and the capacitor C1 is connected to one end of the resistor R7, the other end of the resistor R7 serves as a first output end of the detection circuit, one end of the resistor R6 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point between the resistor R6 and the capacitor C2 serves as a second output end of the detection circuit and is connected to the detection input end of the processing unit, one end of the resistor R13 is connected to the common connection point between the detection capacitor Ct and the capacitor C1, and the other end of the resistor R13 serves as a third output end of the detection circuit; The comparison control circuit includes a resistor R5, a resistor R8, a capacitor C3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a comparator U1, a transistor Q4, an NMOS transistor Q2, a diode D1, a diode D2, a comparator U2, a resistor R14, an OR gate circuit U3 and a DC contactor; One end of the resistor R10 is connected to the power output end of the input control circuit as the power supply end of the comparison control circuit, and the other end of the resistor R10 is connected to the drain of the NMOS tube Q2. The source of the NMOS tube Q2 is grounded through the excitation coil L1 of the DC contactor. The normally closed switch of the DC contactor is set at the output end of the lead-acid battery. The in-phase end of the comparator U1 is used as the detection input end of the comparison control circuit, the inverting end of the comparator U1 is connected to the power output end of the input control circuit through the resistor R5, the inverting end of the comparator U1 is connected to the ground through the resistor R8 and the capacitor C3 in parallel, the output end of the comparator U1 is connected to the first input end of the OR gate circuit through the resistor R11, the inverting end of the comparator U2 is connected to the common connection point between the resistor R5 and the resistor R8, the in-phase end of the comparator U2 is connected to the third output end of the detection circuit, and the output end of the comparator U2 is connected to the OR gate through the resistor R14. The second input end of the circuit, or the output end of the gate circuit, is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the base of the transistor Q4, the cathode of the diode D2 is connected to the base of the transistor Q4, the anode of the diode D2 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the second control output end con2 of the processing unit as the control input end of the comparison control circuit; the emitter of the transistor Q4 is connected to the gate of the NMOS tube Q2, and the collector of the transistor Q4 is connected to the power output end of the input control circuit through the resistor R9.

2. The lead-acid battery status online monitoring system according to claim 1 is characterized in that: The input control circuit includes a resistor R1, a resistor R2, a resistor R3, a PMOS transistor Q1 and a transistor Q2; The source of the PMOS tube Q1 serves as the power input terminal of the input control circuit, the drain of the PMOS tube Q1 serves as the power output terminal of the input control circuit, the gate of the PMOS tube Q1 is connected to the source of the PMOS tube Q1 through the resistor R1, the gate of the PMOS tube Q1 is connected to the collector of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to one end of the resistor R3, and the other end of the resistor R3 serves as the control input terminal of the input control circuit.

3. The lead-acid battery status online monitoring system according to claim 1 is characterized in that: The processing unit includes a pre-processing circuit, a central processing circuit, a memory and a transmission module; The input end of the preprocessing circuit is connected to the detection output ends of the temperature detection module, the discharge information detection module, the internal resistance detection module and the bulge detection control module, the output end of the preprocessing circuit is connected to the central processing circuit, the first control end con1 of the central processing circuit is connected to the first control input end of the bulge detection control circuit, the second control end con2 of the central processing circuit is connected to the second control input end of the bulge detection control circuit, and the central processing circuit is communicatively connected to the remote unit through the transmission module.

4. The lead-acid battery status online monitoring system according to claim 1 is characterized in that: The remote unit includes a monitoring host, an audible and visual alarm, and input and output devices; The monitoring host is connected to the sound and light alarm, the monitoring host is connected to the input and output equipment, and the monitoring host is communicatively connected to the processing unit.

Images