Intelligent charging control system for lead-acid battery of electric bicycle

Abstract

The utility model provides an intelligent charging control system for a lead-acid battery of an electric bicycle, which comprises a lead-acid storage battery pack which is respectively connected with an Internet of Things system and a charger through an intelligent charging module. The intelligent charging module comprises a main control circuit, and a main charging loop, a pre-charging loop, a voltage detection circuit, two power supply circuits and two communication circuits which are connected with the main control circuit, and the main charging loop is connected with the pre-charging loop in parallel; the lead-acid storage battery pack is respectively connected with the charger interface through the main charging loop and the pre-charging loop, and the charger interface is connected with the charger; the main control circuit is respectively connected with the lead-acid storage battery pack and the charger interface through two power supply circuits, and the main control circuit is respectively connected with the Internet of Things system and the charger interface through two communication circuits. According to the utility model, the intelligent charging control of the lead-acid battery of the electric bicycle is realized through the matching relationship among the circuit modules.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric bicycle charging technical field especially, it is a kind of electric bicycle lead-acid battery intelligent charging control system. BACKGROUND

[0002] Two-wheel electric vehicle is indispensable for mass travel demand, and its use safety is related to the safety of people's life and property, to promote the healthy and orderly development of electric vehicle industry, provide more reliable guarantee for the use of electric vehicle, and the electric vehicle regulation GB42295 clearly stipulates that charging mutual recognition becomes an important criterion, this regulation aims to ensure the safety, compatibility and normative of charging process. Under this requirement, effective communication between vehicle and charger is needed, only when confirming that the charger is the type specified by the manufacturer, charging operation is allowed, generally, lead-acid battery does not have this function, and external charging control component needs to be added.

[0003] The existing charging control component on the market generally cannot work in the case of power storage battery power shortage or battery not installed;In addition, there is generally a large impact current at the moment of starting charging, and the service life of the module will be affected. In addition to this, once the lead-acid battery vehicle is plugged into the charger and the city power, it is not controlled during the charging process, even if it is fully charged, the charger remains electrically connected with the vehicle, and long-term mounting brings safety hazards. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing an electric bicycle lead-acid battery intelligent charging control system to solve at least one of the above problems.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a kind of electric bicycle lead-acid battery intelligent charging control system, the system includes lead-acid battery group, the lead-acid battery group is connected with internet of things system and charger respectively by intelligent charging module, the intelligent charging module includes main control circuit and the main charging circuit, pre-charging circuit, voltage detection circuit, two-way power supply circuit and two-way communication circuit connected with the main control circuit, wherein, the main charging circuit is connected in parallel with the pre-charging circuit;

[0007] The lead-acid battery group is connected with charger interface respectively by main charging circuit and pre-charging circuit, and the charger interface is connected with the charger;

[0008] The main control circuit is connected with the lead-acid battery group and the charger interface respectively by two-way power supply circuit, and the main control circuit is connected with the internet of things system and the charger interface respectively by two-way communication circuit;

[0009] In response to the control of starting charging, the voltage of the lead-acid storage battery is detected by the voltage detection circuit, the pre-charging circuit is controlled to carry out current suppression, the main charging circuit is opened after a delay, and the pre-charging circuit is synchronously controlled to be disconnected, so as to charge the lead-acid storage battery.

[0010] Further, the main control circuit comprises a main control MCU.

[0011] The main charging circuit is composed of a first relay, a second freewheeling diode, a third switch module and a third resistor, the first end of the coil of the first relay is connected with the second end of the third switch module and the anode of the second freewheeling diode respectively, the first end of the third switch module is connected with the main control MCU through the third resistor, and the second end of the coil of the first relay and the cathode of the second freewheeling diode are connected with a power supply VCC.

[0012] The first end of the switch of the first relay is connected with the positive pole of the charger interface, and the second end of the switch of the first relay is connected with the positive pole of the lead-acid storage battery.

[0013] Further, the third switch module comprises a third triode, the third triode is an NPN type triode, the base of the third triode is connected with the third resistor, the collector of the third triode is connected with the anode of the second freewheeling diode and the first end of the coil of the first relay respectively, and the emitter of the third triode is grounded.

[0014] Further, the pre-charging circuit is composed of a second relay, a fifth freewheeling diode, a fourth switch module and an eighth resistor, the first end of the coil of the second relay is connected with the second end of the fourth switch module and the anode of the fifth freewheeling diode respectively, the first end of the fourth switch module is connected with the main control MCU through the eighth resistor, and the second end of the coil of the second relay and the cathode of the fifth freewheeling diode are connected with the power supply VCC.

[0015] The first end of the switch of the second relay is connected with the positive pole of the charger interface, and the second end of the switch of the second relay is connected with the positive pole of the lead-acid storage battery through a seventh resistor.

[0016] Further, the fourth switch module comprises a fourth triode, the fourth triode is an NPN type triode, the base of the fourth triode is connected with the eighth resistor, the collector of the fourth triode is connected with the anode of the fifth freewheeling diode and the first end of the coil of the second relay respectively, and the emitter of the fourth triode is grounded.

[0017] Further, the voltage detection circuit comprises a voltage dividing circuit composed of a tenth resistor and an eleventh resistor, one end of the tenth resistor is connected with the master MCU, and the other end of the tenth resistor is connected with the positive electrode of the lead-acid storage battery.

[0018] One end of the eleventh resistor is connected with the master MCU, and the other end of the eleventh resistor is connected on the connecting line between the tenth resistor and the master MCU.

[0019] Further, the power supply circuit comprises a first switch module, the first end of the first switch module is connected with the cathode of a first freewheeling diode and the first end of a second resistor respectively, the anode of the first freewheeling diode is grounded, the second end of the second resistor is connected with a power supply VCC, the first end of a second capacitor, the first end of a first resistor, the cathode of a third freewheeling diode and the cathode of a fourth freewheeling diode respectively, the second end of the first switch module is connected with the second end of the first resistor, the third end of the first switch module is connected with a 5V voltage source, and the third end of the first switch module is also grounded through a first capacitor.

[0020] The anode of the third freewheeling diode is connected with the positive electrode of the lead-acid storage battery, and the anode of the fourth freewheeling diode is connected with the positive electrode of the charger.

[0021] Further, the first switch module comprises a first triode, the first triode is an NPN type triode, the base of the first triode is connected with the cathode of the first freewheeling diode and the second resistor, the collector of the first triode is connected with the first resistor, and the emitter of the first triode is connected with the first capacitor and the 5V voltage source respectively.

[0022] Further, the master MCU is connected with a first charging communication port through a fourth resistor and connected with a second charging communication port through a fifth resistor respectively, and the first charging communication port and the second charging communication port are used for being connected with the Internet of Things system.

[0023] Further, the master MCU is connected with a third charging communication port through a sixth resistor, and the third charging communication port is used for being connected with the charger interface.

[0024] Compared with the prior art, the intelligent charging control system for the lead-acid battery of the electric bicycle has the following beneficial effects:

[0025] The utility model discloses a kind of electric bicycle lead-acid battery intelligent charging control system, through the cooperation between each circuit module, the intelligent charging control of electric bicycle lead-acid battery is realized, so that the two-wheeled electric vehicle of lead-acid battery can identify whether charger is factory specified model, avoid using non-standard charger to bring the security risk of charging electric vehicle;Simultaneously, after completing charging, module initiatively cuts off the electrical connection of charger and battery, reduces the security risk of long time hanging, power battery power shortage or not connected when also can start charging loop, the pre-charging circuit of cooperation arrangement can effectively reduce current impact, prolong service life. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings that form part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model.

[0027] Figure 1 A kind of electric bicycle lead-acid battery intelligent charging control system schematic diagram for the utility model embodiment described is shown in the figure;

[0028] Figure 2 A kind of electric bicycle lead-acid battery intelligent charging control system partial circuit schematic diagram for the utility model embodiment described is shown in the figure;

[0029] Figure 3 The power supply circuit schematic diagram for the utility model embodiment described is shown in the figure. DETAILED DESCRIPTION

[0030] It should be noted that, in the case of no conflict, the embodiment in the utility model and the features in the embodiment can be combined with each other.

[0031] The utility model will be described in detail below with reference to the drawings and in combination with embodiment.

[0032] Please refer to Figure 1 The embodiment provides a kind of electric bicycle lead-acid battery intelligent charging control system, as shown in the figure, and the system includes lead-acid battery group, lead-acid battery group is connected with Internet of Things system and charger respectively by intelligent charging module, and intelligent charging module includes main control circuit, and the main charging loop, pre-charging loop, voltage detection circuit, two-way power supply circuit and two-way communication circuit connected with main control circuit, wherein, main charging loop is connected in parallel with pre-charging loop;

[0033] Lead-acid battery group is connected with charger interface respectively by main charging loop and pre-charging loop, and charger interface connects charger;

[0034] The master control circuit is connected with the lead-acid storage battery and the charger through two power supply circuits, and is connected with the Internet of Things system and the charger through two communication circuits.

[0035] In response to the control of starting charging, the voltage of the lead-acid storage battery is detected through the voltage detection circuit, the current suppression of the pre-charging circuit is controlled, the main charging circuit is opened after a delay, and the pre-charging circuit is synchronously controlled to be disconnected, so as to charge the lead-acid storage battery.

[0036] Specifically, in the embodiment, the lead-acid storage battery is connected with the charging interface through the main charging circuit and the pre-charging circuit in the intelligent charging module, the charging circuit adopts a relay or an electronic switch, and a power-type resistor is connected in series in the pre-charging circuit to suppress a large current impact at the starting moment and provide a small current charging to the rear. The intelligent charging module is connected with the Internet of Things module through a full-duplex real-time communication mode.

[0037] When the charger is connected to the charging interface, the charging communication port of the intelligent charging module is connected with the charger through the charging interface, and a single-wire half-duplex communication mode is adopted. After the charger is connected, the intelligent charging module initiates a communication protocol to match and identify the charger, and confirms whether the specifications, models and parameters such as voltage and current of the charger are matched.

[0038] After the matching and identification are passed and the charger is identified, the intelligent charging module detects the voltage of the battery group through the voltage detection circuit. If the voltage value is too low, the voltage difference between the charging interface and the battery group is too large, and the current is too large when the charging circuit is closed. At this time, the intelligent charging module opens the pre-charging circuit, establishes the charging current and limits it within a reasonable range, opens the main charging circuit after a delay, and then closes the pre-charging circuit, so as to ensure the continuation of the charging.

[0039] At this time, the charger starts to charge the battery, and the intelligent charging module communicates with the charger in real time during the charging process to obtain the current charging state, including but not limited to voltage, current, charging time and the like. The obtained information is communicated with the Internet of Things system through a transmission line, and is transmitted to a cloud platform.

[0040] After the cloud platform issues an instruction to the Internet of Things system, the Internet of Things system issues an instruction to start or stop charging to the intelligent charging module, and the intelligent charging module executes the action. If the charging is stopped, a stop charging instruction is initiated to the charger, the charger responds and confirms, and after the charging is stopped, the electronic charging switch is disconnected to cut off the connection between the charger and the battery. If the charging is started again, the communication is initiated, the start charging instruction is sent to the charger, and the electronic switch is closed.

[0041] When the battery is fully charged and the charger stops charging, the intelligent charging module receives the charging completion instruction sent by the charger, and disconnects the electronic switch to cut off the electrical connection between the battery and the charger, thereby reducing the safety hazards caused by long-time charging.

[0042] In the state of not being inserted into the charger, the charging module does not detect the communication of the charger, and always keeps the charging internal electronic switch in the disconnected state; the battery connection between the charging port and the battery is cut off, so that there is no high voltage in the external charging port part, and the safety hazards are reduced.

[0043] During the charging process, if the charger is forcibly pulled out, the intelligent charging module will cut off the electronic switch after a time delay after detecting the interruption of the charging communication.

[0044] The lead-acid battery pack is connected to the charging interface through the main charging circuit and the pre-charging circuit in the intelligent charging module. The charging circuit adopts a relay or an electronic switch, and the power resistor is connected in series in the pre-charging circuit to suppress the large current impact at the start moment and provide a small current charging to the rear.

[0045] The intelligent charging control system for the lead-acid battery of the electric bicycle described in the embodiment realizes the intelligent charging control of the lead-acid battery of the electric bicycle through the cooperation between the circuit modules, so that the two-wheeled electric vehicle with the lead-acid battery can identify whether the charger is the specified model of the manufacturer, thereby avoiding the safety hazards caused by charging the electric vehicle with a non-standard charger. At the same time, after completing the charging, the module actively cuts off the electrical connection between the charger and the battery, thereby reducing the safety hazards caused by long-time mounting. The charging circuit can also be started when the power battery is depleted or not connected, and the pre-charging circuit can effectively reduce the current impact and prolong the service life.

[0046] In some embodiments, as shown in FIG. Figure 2 The main control circuit includes a main control MCU, and the main control MCU adopts a gd32f405ret6 type chip.

[0047] The main charging circuit is composed of a first relay, a second freewheeling diode D2, a third switch module and a third resistor R3. The first end of the coil of the first relay is connected with the second end of the third switch module and the anode of the second freewheeling diode D2 respectively, the first end of the third switch module is connected with the main control MCU through the third resistor R3, and the second end of the coil of the first relay and the cathode of the second freewheeling diode D2 are connected with the power supply VCC.

[0048] The first end of the switch of the first relay is connected with the positive electrode of the charger interface, and the second end of the switch of the first relay is connected with the positive electrode of the lead-acid battery pack.

[0049] Further, the third switch module comprises a third transistor Q3, the third transistor Q3 is an NPN transistor, the base of the third transistor Q3 is connected with the third resistor, the collector of the third transistor Q3 is connected with the anode of the second freewheeling diode D2 and the first end of the coil of the first relay respectively, and the emitter of the third transistor Q3 is grounded.

[0050] The pre-charge circuit is composed of a second relay, a fifth freewheeling diode D5, a fourth switch module and an eighth resistor R8, the first end of the coil of the second relay is connected with the second end of the fourth switch module and the anode of the fifth freewheeling diode D5 respectively, the first end of the fourth switch module is connected with the main control MCU through the eighth resistor R8, and the second end of the coil of the second relay and the cathode of the fifth freewheeling diode D5 are connected with the power supply VCC.

[0051] The first end of the switch of the second relay is connected with the positive pole of the charger interface, and the second end of the switch of the second relay is connected with the positive pole of the lead-acid battery group through the seventh resistor R7.

[0052] Further, the fourth switch module comprises a fourth transistor Q4, the fourth transistor Q4 is an NPN transistor, the base of the fourth transistor Q4 is connected with the eighth resistor, the collector of the fourth transistor Q4 is connected with the anode of the fifth freewheeling diode D5 and the first end of the coil of the second relay respectively, and the emitter of the fourth transistor Q4 is grounded.

[0053] Specifically, in the embodiment, as shown in Figure 2 , the main charging circuit adopts the switch circuit formed by the high-power relay and the freewheeling diode, the MCU outputs the high level to turn on the transistor Q3 through R3, the relay coil takes the VCC voltage to make the contact be attracted; the pre-charge circuit is connected in series with the small-power relay and the current-limiting power resistor R7, the pre-charge circuit can realize the current suppression by using the pre-charge circuit at the charging start, so as to reduce the life reduction caused by the current impact.

[0054] In some embodiments, as shown in Figure 2 , the voltage detection circuit comprises a voltage dividing circuit composed of a tenth resistor R10 and an eleventh resistor R11, one end of the tenth resistor R10 is connected with the main control MCU, and the other end of the tenth resistor R10 is connected with the positive pole of the lead-acid battery group.

[0055] One end of the eleventh resistor R11 is connected with the main control MCU, and the other end of the eleventh resistor R11 is connected on the connection line between the tenth resistor R10 and the main control MCU.

[0056] Specifically, in the embodiment, the voltage detection circuit samples the current voltage of the lead-acid battery group by sampling the battery voltage through the two precision resistors R10 and R11.

[0057] When the power storage battery is low in voltage or is not installed, the charging control device cannot work normally, and further cannot be connected in communication with the external charger, so that the charging circuit cannot be opened to power on the vehicle. In the embodiment, when the battery voltage is detected to be too low, the charging interface is powered, so that the external input voltage can be used for starting, and the problem of inability to charge is solved.

[0058] In some embodiments, as shown in Figure 3 The power supply circuit includes a first switch module, the first end of the first switch module is connected to the cathode of the first freewheeling diode D1 and the first end of the second resistor R2, the anode of the first freewheeling diode D1 is grounded, the second end of the second resistor R2 is connected to the power supply VCC, the first end of the second capacitor C2, the first end of the first resistor R1, the cathode of the third freewheeling diode D3 and the cathode of the fourth freewheeling diode D4, the second end of the first resistor R1 is connected to the second end of the first switch module, the third end of the first switch module is connected to the 5V voltage source, and the third end of the first switch module is also grounded through the first capacitor C1.

[0059] The anode of the third freewheeling diode D3 is connected to the positive electrode of the lead-acid storage battery, and the anode of the fourth freewheeling diode D4 is connected to the positive electrode of the charger.

[0060] Further, the first switch module includes a first triode Q1, which is an NPN type triode, the base of the first triode Q1 is connected to the cathode of the first freewheeling diode D1 and the second resistor R2, the collector of the first triode Q1 is connected to the first resistor R1, and the emitter of the first triode Q1 is connected to the first capacitor C1 and the 5V voltage source.

[0061] Specifically, in the embodiment, the positive electrode of the charger and the positive electrode of the lead-acid storage battery are respectively connected to the linear voltage regulator power supply VCC input end through diodes, so that the VCC voltage is about 0.7V lower than the higher of the battery and the charging positive electrode, the VCC outputs about 5V voltage through the voltage reduction circuit formed by the triode Q1 and the 5.6V voltage stabilizing tube to supply power to the MCU, and the anti-backflow circuit formed by the triode D3 and the triode D4 can prevent the charging current from passing through the circuit to abnormally supply power to the battery.

[0062] The power supply part of the intelligent charging module samples two power supply circuits, one of which takes power from the positive electrode of the battery, and the other of which takes power from the positive electrode of the charging interface, and the higher voltage of the two is used as the power supply, and the voltage is higher than the higher one, when the charging positive electrode is not connected, the battery is powered, and when the battery is low in power or is not connected, the charging positive electrode is powered, so as to ensure normal use in various situations.

[0063] In some embodiments, the master MCU connects the first charging communication port through a fourth resistor R4 and the second charging communication port through a fifth resistor R5, respectively, and the first and second charging communication ports are used to connect with the Internet of Things system.

[0064] The master MCU connects the third charging communication port through a sixth resistor R6, and the third charging communication port is used to connect with the charger interface.

[0065] Specifically, in the present embodiment, the system provides two kinds of communication, one is full-duplex communication between the Internet of Things module, and the other is single-wire half-duplex communication with the charger, the full-duplex communication is double-port series resistance R4, R5, and the single-wire half-duplex communication is single-port series resistance R6.

[0066] For the charging protocol communication matching of the lead-acid storage battery and the specified charger, if the matching is successful, the charging is actively controlled to be turned on, and if the matching is not successful, the charging is turned off and prohibited;

[0067] Through the communication with the vehicle-mounted Internet of Things module, the current charging state can be transmitted to the Internet of Things platform, and the current charging state is sent to the APP, and the APP issues the start / stop charging instruction to the Internet of Things platform, which is transmitted from the cloud to the vehicle-mounted Internet of Things module, and then communicated to the intelligent charging module, and the charging module connects / cuts off the electrical connection between the charger and the vehicle through the electronic switch or the relay, so that the charging state is controllable. The present embodiment only protects the circuit connection relationship of the intelligent charging module, and the transmission matching of the communication protocol is the prior art in the field, and the present application will not be further described.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

[0069] The above is only a preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An intelligent charging control system for lead-acid batteries of electric bicycles, the system comprising a lead-acid battery pack connected to an Internet of Things system and a charger through an intelligent charging module, characterized in that: the intelligent charging module comprises a main control circuit, and a main charging circuit, a pre-charging circuit, a voltage detection circuit, a two-way power supply circuit and a two-way communication circuit connected to the main control circuit, wherein the main charging circuit is connected in parallel with the pre-charging circuit; the lead-acid battery pack is connected to the charger through the main charging circuit and the pre-charging circuit; the main control circuit is connected to the lead-acid battery pack and the charger through the two-way power supply circuit; and the main control circuit is connected to the Internet of Things system and the charger through the two-way communication circuit; in response to a control to start charging, the voltage of the lead-acid battery pack is detected through the voltage detection circuit, the pre-charging circuit is controlled to suppress current, the main charging circuit is opened after a delay, and the pre-charging circuit is simultaneously controlled to be disconnected, so as to charge the lead-acid battery pack.

2. The intelligent charging control system for lead-acid batteries of electric bicycles according to claim 1, characterized in that: the main control circuit comprises a main control MCU; the main charging circuit is composed of a first relay, a second freewheeling diode, a third switch module and a third resistor, the first end of the coil of the first relay is connected to the second end of the third switch module and the anode of the second freewheeling diode, the first end of the third switch module is connected to the main control MCU through the third resistor, and the second end of the coil of the first relay and the cathode of the second freewheeling diode are connected to a power supply VCC; the first end of the switch of the first relay is connected to the positive electrode of a charger interface, and the second end of the switch of the first relay is connected to the positive electrode of the lead-acid battery pack.

3. The intelligent charging control system for lead-acid batteries of electric bicycles according to claim 2, characterized in that: the third switch module comprises a third triode, the third triode is an NPN triode, the base of the third triode is connected to the third resistor, the collector of the third triode is connected to the anode of the second freewheeling diode and the first end of the coil of the first relay, and the emitter of the third triode is grounded.

4. The intelligent charging control system for lead-acid batteries of electric bicycles according to claim 2, characterized in that: the pre-charging circuit is composed of a second relay, a fifth freewheeling diode, a fourth switch module and an eighth resistor, the first end of the coil of the second relay is connected to the second end of the fourth switch module and the anode of the fifth freewheeling diode, the first end of the fourth switch module is connected to the main control MCU through the eighth resistor, and the second end of the coil of the second relay and the cathode of the fifth freewheeling diode are connected to the power supply VCC. ​ ​ ​ ​ ​ ​ ​ ​ ​ The first end of the switch of the second relay is connected with the positive pole of the charger interface, and the second end of the switch of the second relay is connected with the positive pole of the lead-acid battery through the seventh resistor. 5.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 4, characterized in that: The fourth switch module comprises a fourth transistor, which is an NPN transistor, the base of the fourth transistor is connected with the eighth resistor, the collector of the fourth transistor is connected with the anode of the fifth freewheeling diode and the first end of the coil of the second relay respectively, and the emitter of the fourth transistor is grounded. 6.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 2, characterized in that: The voltage detection circuit comprises a voltage dividing circuit composed of a tenth resistor and an eleventh resistor, one end of the tenth resistor is connected with the master MCU, and the other end of the tenth resistor is connected with the positive pole of the lead-acid battery; one end of the eleventh resistor is connected with the master MCU, and the other end of the eleventh resistor is connected on the connection line between the tenth resistor and the master MCU. 7.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 2, characterized in that: The power supply circuit comprises a first switch module, the first end of the first switch module is connected with the cathode of the first freewheeling diode and the first end of the second resistor respectively, the anode of the first freewheeling diode is grounded, the second end of the second resistor is connected with the power supply VCC, the first end of the second capacitor, the first end of the first resistor, the cathode of the third freewheeling diode and the cathode of the fourth freewheeling diode respectively, the second end of the first switch module is connected with the second end of the first resistor, the third end of the first switch module is connected with a 5V voltage source, and the third end of the first switch module is also grounded through the first capacitor; the anode of the third freewheeling diode is connected with the positive pole of the lead-acid battery, and the anode of the fourth freewheeling diode is connected with the positive pole of the charger. 8.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 7, characterized in that: The first switch module comprises a first transistor, which is an NPN transistor, the base of the first transistor is connected with the cathode of the first freewheeling diode and the second resistor, the collector of the first transistor is connected with the first resistor, and the emitter of the first transistor is connected with the first capacitor and the 5V voltage source respectively. 9.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 2, characterized in that: The master MCU is connected with the first charging communication port through the fourth resistor and the second charging communication port through the fifth resistor respectively, and the first charging communication port and the second charging communication port are used for connecting with the Internet of Things system. 10.The intelligent charging control system of a lead-acid battery of an electric bicycle according to claim 2, characterized in that: The main control MCU is connected with the third charging communication port through the sixth resistor, and the third charging communication port is used for connecting with the charger interface.

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