Motor-driven battery pack management system

Abstract

The present invention discloses a motor-driven battery pack management system, comprising a lithium battery pack, a control module, a charge and discharge module and a detection and protection module. The charge and discharge module comprises an adapter power interface and a battery power supply port. The positive end of the adapter power interface is connected to a +5V power supply circuit and an input end PW1 of a battery charging control circuit through a DC-DC boost circuit and a constant voltage and constant current buck circuit in sequence. The detection and protection module comprises a charge and discharge detection circuit, an over-temperature detection circuit, a current detection control circuit and a voltage detection control circuit. The present invention protects the lithium battery pack more reliably through the DC-DC boost circuit and the constant voltage and constant current buck circuit. The controller reduces the battery standby current through mode switching to ensure that the lithium battery can work normally after being left for a long time. The controller has the functions of battery overvoltage protection, undervoltage protection, over-temperature protection, short-circuit protection and the like, effectively improving the level of management and monitoring of the lithium battery pack and forming overall reliable protection.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a motor-driven battery pack management system. Background Art

[0002] Lithium batteries have the characteristics of long service life, small self-discharge effect, high voltage at the cell terminal, high energy density and no memory effect. They have become one of the mainstream batteries and are widely used. The structure of large-capacity lithium battery packs is relatively complex, and the number of batteries is large, which increases the difficulty of protection. At present, many lithium battery packs on the market do not have protection functions. When the battery is overcharged, over-discharged, or the output is short-circuited, the lithium battery will heat up, the temperature will be too high, the battery will be damaged, and even cause a fire. Therefore, it cannot directly power the DC motor or DC power supply module, and battery management protection must be added for normal use.

[0003] Therefore, the present invention provides a new solution to solve this problem. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a motor-driven battery pack management system.

[0005] The technical solution is: a motor-driven battery pack management system, including a lithium battery pack, a control module, a charge and discharge module and a detection and protection module, wherein the lithium battery pack includes at least one lithium battery, and the control module includes a controller U4 and an analog switch chip U5 connected via a serial port; the charge and discharge module includes an adapter power interface and a battery power supply port, the positive end of the adapter power interface is connected to a +5V power supply circuit and an input end PW1 of a battery charging control circuit via a DC-DC boost circuit and a constant voltage and constant current buck circuit in turn, the control end of the battery charging control circuit is connected to an output end P10 of the controller, and the adapter power interface and the positive end of the lithium battery pack are connected via diodes D1 and D2 are connected to the battery power supply port M+, and the +5V power supply circuit is used to power the control module and the detection and protection module. The battery charging control circuit is used to control the charging state of the lithium battery pack; the detection and protection module includes: a charge and discharge detection circuit, used to detect the charge and discharge state of the lithium battery pack; an over-temperature detection circuit, used to detect the temperature of the lithium battery pack during operation; a current detection control circuit, used to detect the output current of the lithium battery pack, and control the output state of the battery power supply port through a controller; a voltage detection control circuit, used to detect the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit, and control the charging state of the lithium battery pack through a controller.

[0006] Furthermore, the DC-DC boost circuit includes a boost chip U1, pin 3 of the boost chip U1 is connected to one end of the inductor L2 and the positive electrode of the diode D3, the other end of the inductor L2 is connected to one end of the capacitor C7, EC3, the negative electrode of the diode D4 and pin 4 of the boost chip U1, the positive electrode of the diode D4 is connected to the positive end of the adapter power interface, the other end of the capacitor C7, EC3 and the pin 1 of the boost chip U1 are connected to the negative end of the adapter power interface, the pin 3 of the boost chip U1 is also connected to the resistor R4 and one end of the capacitor EC2 through the diode D3, the other end of the resistor R4 is connected to one end of the resistor R6 and pin 5 of the boost chip U1, and the other end of the resistor R6 and the capacitor EC2 are grounded.

[0007] Furthermore, the constant voltage and constant current step-down circuit includes a voltage stabilizing chip U2, wherein pin 2 of the voltage stabilizing chip U2 is connected to one end of capacitors C5 and EC2, pin 1 of the voltage stabilizing chip U2 is connected to resistor R2, capacitor C2, one end of inductor L1 and the drain of MOS tube Q1, the other end of resistor R2 is grounded through capacitor C1, the other end of capacitor C2 is connected to pin 5 of the voltage stabilizing chip U2, the other end of inductor L1 is connected to resistors R1, R3, one end of capacitor C3 and pin 6 of the voltage stabilizing chip U2, the other end of resistors R1 and R3 is connected to one end of capacitors C4 and EC1 and pin 7 of the voltage stabilizing chip U2, the other end of capacitors C3, C4 and EC1 is grounded, and pin 3 of the voltage stabilizing chip U2 is grounded through capacitor C8. Pin 4 of the voltage stabilizing chip U2 is connected to the gate of the MOS tube Q1, the source of the MOS tube Q1 is grounded, pin 7 of the voltage stabilizing chip U2 is connected to the capacitor C6, one end of the resistor R5 and the positive electrode of the diode D5, and pin 8 of the voltage stabilizing chip U2 is connected to the capacitor C6, the other end of the resistor R5, and is grounded through parallel resistors R7 and R8.

[0008] Furthermore, the +5V power supply circuit includes a step-down chip U3, pin 1 of the step-down chip U3 is grounded through parallel capacitors C10 and C11, and is connected to the cathode of the diode D6 through resistors R11, R10, R9, R12, and R14 in sequence, the anode of the diode D6 is connected to the cathode of D5, pin 2 of the step-down chip U3 is grounded, and pin 3 of the step-down chip U3 is connected to the +5V power supply port and is grounded through parallel capacitors C12 and C20.

[0009] Furthermore, the battery charging control circuit includes a MOS tube Q9, the drain of the MOS tube Q9 is connected to the cathode of the diodes D5 and D9 and one end of the resistor R43, the source of the MOS tube Q9 is connected to the positive end of the lithium battery pack and is connected to the cathode of D6 through the diode D8, the gate of the MOS tube Q9 is connected to the anode of the diode D9, the other end of the resistor R43 and one end of the resistor R45 through the resistor R41, the other end of the resistor R45 is connected to the collector of the transistor Q11, the base of the transistor Q11 is connected to one end of the resistors R49 and R51, the other end of the resistor R49 is connected to the output end P10 of the controller, and the emitter of the transistor Q11 and the other end of the resistor R51 are grounded.

[0010] Furthermore, the charge and discharge detection circuit includes a transistor Q10, the collector of the transistor Q10 is connected to the input terminal AN1 of the controller through a resistor R42, the base of the transistor Q10 is connected to one end of resistors R21 and R40, the other end of the resistor R21 is connected to the positive end of the adapter power interface through a voltage regulator DZ1, and the emitter of the transistor Q10 and the other end of the resistor R40 are grounded.

[0011] Furthermore, the over-temperature detection circuit includes a thermistor NTC arranged in the lithium battery pack, the power end of the thermistor NTC is connected to the +5V power supply port, and the output end of the thermistor NTC is connected to the input end of the controller U4 and the analog switch chip U5.

[0012] Furthermore, the current detection control circuit includes a MOS tube Q12 connected to the battery power supply port M-, the gate of the MOS tube Q12 is connected to the output terminal P9 of the controller U4 through a resistor R53, the source of the MOS tube Q12 is grounded through a parallel resistor C32, resistors R57, and R58, and is connected to the base of the transistor Q13, the pin 17 of the controller U4 and the resistor R55, and one end of the capacitor C31 through a resistor R56, the collector of the transistor Q13 is connected to one end of the capacitor C29 and the pin 19 of the controller U4 through a resistor R52, and the emitter of the transistor Q13 is connected in parallel with the other ends of the resistor R55, the capacitor C31, and C29 to the ground.

[0013] Furthermore, the voltage detection control circuit includes multiple detection branches with the same structure, and the detection branch includes a MOS tube Qj, the gate of the MOS tube Qj is connected to pin 2 of the controller U4 through a resistor R54, the drain of the MOS tube Qj is connected through a resistor Rn and is only connected to the positive electrode of a different lithium battery, the source of the MOS tube Qj is grounded through a resistor Rm, and is connected to one end of the capacitor Cq and the input end of the analog switch chip through a resistor Rp, and the other end of the capacitor Cq is grounded.

[0014] Furthermore, it also includes a power indication circuit, which includes indicator lights L3, L4, L5, and L6. The positive poles of the indicator lights L3, L4, L5, and L6 are connected to the output end of the controller through resistors R36, R37, R38, and R39 respectively, and the negative poles of the indicator lights L3, L4, L5, and L6 are grounded.

[0015] Through the above technical solution, the beneficial effects of the present invention are:

[0016] 1. The present invention provides charging voltage to the lithium battery pack when connected to the adapter, and also provides voltage to the output DC motor or load, which helps to extend the service life of the lithium battery pack;

[0017] 2. Through the DC-DC boost circuit and constant voltage and constant current buck circuit, the input and output voltages can work normally even when they are close, which can more reliably protect the lithium battery pack and match adapters of more specifications;

[0018] 3. During the charging and discharging process of the lithium battery pack, the controller detects the battery power by controlling the MOS tube Qj; when not working, the controller MCU switches to standby sleep mode to reduce the standby current of the lithium battery pack, ensuring that the lithium battery pack can work normally after being left idle for a long time;

[0019] 4. The controller controls the EN enable pin of the boost chip through high and low levels. After the battery is fully charged, the DC-DC boost circuit will not work, thereby increasing the service life of the components of the DC-DC boost circuit;

[0020] 5. The power indicator circuit displays the power of the battery in real time during operation, making it easy to understand the current power status of the lithium battery pack;

[0021] 6. It has functions such as battery overvoltage protection, undervoltage protection, over-temperature protection, short-circuit protection, etc., which effectively improves the level of lithium battery pack management and monitoring, forming an overall reliable protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The circuit structure diagram of the lithium battery pack of the present invention.

[0023] Figure 2 The figure is a schematic diagram showing the connection between the DC-DC boost circuit and the constant voltage and constant current buck circuit of the present invention.

[0024] Figure 3 This is a schematic diagram of the connection between the +5V power supply circuit and the battery charging control circuit of the present invention.

[0025] Figure 4 This is a schematic diagram of the charge and discharge detection circuit of the present invention.

[0026] Figure 5It is a connection principle diagram of the control module of the present invention, the over-temperature detection circuit, the current detection control circuit and the voltage detection control circuit.

[0027] Figure 6 It is the control principle diagram of the present invention. DETAILED DESCRIPTION

[0028] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 6 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0029] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] The battery pack management system driven by the motor includes a lithium battery pack J2, a control module, a charge and discharge module, and a detection and protection module. The lithium battery pack J2 includes at least one lithium battery, such as Figure 1 As shown, the present invention takes seven lithium batteries B1-B7 as an example, which can power the motor and the load. The control module includes a controller U4 and an analog switch chip U5 connected via a serial port.

[0031] The charging and discharging module includes an adapter power interface J1 and a battery power supply port J4. The positive end of the adapter power interface J1 is connected to the +5V power supply circuit and the input end PW1 of the battery charging control circuit through a DC-DC boost circuit and a constant voltage and constant current buck circuit in sequence. The control end of the battery charging control circuit is connected to the output end P10 of the controller U4. The adapter power interface J1 and the positive end of the lithium battery pack are connected to the battery power supply port M+ through diodes D1 and D2 respectively. The +5V power supply circuit is used to power the control module and the detection and protection module, and the battery charging control circuit is used to control the charging state of the lithium battery pack. Among them, after the adapter power interface J1 is turned on, it is used to provide charging voltage to the lithium battery pack and provide voltage to the output DC motor or load. At the same time, when the adapter power supply is insufficient, the lithium battery pack will supplement the power supply to the motor and load.

[0032] The detection and protection module includes: a charge and discharge detection circuit, which is used to detect the charge and discharge status of the lithium battery pack; an over-temperature detection circuit, which is used to detect the temperature of the lithium battery pack during operation; a current detection control circuit, which is used to detect the output current of the lithium battery pack and control the output status of the battery power supply port through the controller U4; a voltage detection control circuit, which is used to detect the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit, and control the charging status of the lithium battery pack through the controller U4.

[0033] like Figure 2As shown, the DC-DC boost circuit includes a boost chip U1, and pin 3 of the boost chip U1 is connected to one end of the inductor L2 and the positive electrode of the diode D3, and the other end of the inductor L2 is connected to one end of the capacitor C7, EC3, the negative electrode of the diode D4 and pin 4 of the boost chip U1, and the positive electrode of the diode D4 is connected to the positive end of the adapter power interface J1, and the other ends of the capacitors C7 and EC3 are connected to the negative end of the adapter power interface J1 with pin 1 of the boost chip U1, and pin 3 of the boost chip U1 is also connected to one end of the resistor R4 and capacitor EC2 through the diode D3, and the other end of the resistor R4 is connected to one end of the resistor R6 and pin 5 of the boost chip U1, and the other ends of the resistor R6 and capacitor EC2 are grounded. After the adapter power interface J1 is turned on, the output voltage of the adapter is sent to pin 4 of the boost chip U1, thereby performing DC-DC boosting, and then powering the constant voltage and constant current buck circuit. Pin 6 of the controller controls the EN enable pin of the boost chip U1 through high and low levels. When the battery is fully charged, the DC-DC boost circuit does not work, thereby increasing the service life of the components of the DC-DC boost circuit.

[0034] The constant voltage and constant current step-down circuit includes a voltage stabilizing chip U2, wherein pin 2 of the voltage stabilizing chip U2 is connected to one end of capacitors C5 and EC2, pin 1 of the voltage stabilizing chip U2 is connected to resistor R2, capacitor C2, one end of inductor L1 and the drain of MOS tube Q1, the other end of resistor R2 is grounded through capacitor C1, the other end of capacitor C2 is connected to pin 5 of the voltage stabilizing chip U2, the other end of inductor L1 is connected to resistors R1, R3, one end of capacitor C3 and pin 6 of the voltage stabilizing chip U2, the other ends of resistors R1 and R3 are connected to one end of capacitors C4 and EC1 and pin 7 of the voltage stabilizing chip U2, the other ends of capacitors C3, C4 and EC1 are grounded, and pin 3 of the voltage stabilizing chip U2 is grounded through capacitor C8. Pin 4 of the voltage regulator chip U2 is connected to the gate of the MOS tube Q1, the source of the MOS tube Q1 is grounded, pin 7 of the voltage regulator chip U2 is connected to the capacitor C6, one end of the resistor R5 and the positive electrode of the diode D5, and pin 8 of the voltage regulator chip U2 is connected to the other end of the capacitor C6 and the resistor R5, and is grounded through parallel resistors R7 and R8. The output voltage of the boost chip U1 is filtered by the capacitor and sent to pin 2 of the voltage regulator chip U2 for processing. The voltage regulator chip U2 adopts the buck principle and constant voltage and constant current output, ensuring that the lithium battery is charged with constant current first and then constant voltage to prevent overcharging of the lithium battery pack.

[0035] like Figure 3As shown, the +5V power supply circuit includes a buck chip U3, and the pin 1 of the buck chip U3 is grounded through parallel capacitors C10 and C11, and is connected to the cathode of the diode D6 through resistors R11, R10, R9, R12, and R14 in turn, and the anode of the diode D6 is connected to the cathode of D5, the pin 2 of the buck chip U3 is grounded, and the pin 3 of the buck chip U3 is connected to the +5V power supply port, and is grounded through parallel capacitors C12 and C20. The present invention forms two +5V power supply modes when used specifically, that is, the adapter is powered when the adapter is connected, and the power supply voltage of the adapter is processed by the DC-DC boost circuit, the constant voltage and constant current buck circuit, and the buck chip U3 in turn, and the +5V power supply is output to power the control module and the detection protection module. When the adapter is disconnected, the lithium battery pack is processed by the buck chip U3, and the +5V power supply is output to power the control module and the detection protection module.

[0036] The battery charging control circuit includes a MOS tube Q9, a drain of the MOS tube Q9 is connected to the cathode of the diodes D5 and D9 and one end of the resistor R43, a source of the MOS tube Q9 is connected to the positive end of the lithium battery pack, and is connected to the cathode of D6 through the diode D8, a gate of the MOS tube Q9 is connected to the anode of the diode D9, the other end of the resistor R43 and one end of the resistor R45 through the resistor R41, the other end of the resistor R45 is connected to the collector of the transistor Q11, the base of the transistor Q11 is connected to one end of the resistors R49 and R51, the other end of the resistor R49 is connected to the output end P10 of the controller U4, and the emitter of the transistor Q11 and the other end of the resistor R51 are grounded. The battery charging control circuit manages the lithium battery pack during the charging process. If the lithium battery pack has abnormalities such as overvoltage, undervoltage, overtemperature, etc., the output terminal P10 of the controller U4 outputs a high-level signal to turn on the transistor Q11, thereby short-circuiting the gate of the MOS tube Q9 to cut it off, and then shutting down the charging, thereby protecting the lithium battery pack until the abnormality is resolved and charging is resumed.

[0037] like Figure 4 As shown, the charge and discharge detection circuit includes a transistor Q10, the collector of the transistor Q10 is connected to the input terminal AN1 of the controller U4 through a resistor R42, the base of the transistor Q10 is connected to one end of the resistors R21 and R40, the other end of the resistor R21 is connected to the positive end of the adapter power interface J1 through a voltage regulator DZ1, and the emitter of the transistor Q10 and the other end of the resistor R40 are grounded. The charge and discharge detection circuit detects whether the adapter is connected, so as to distinguish whether the lithium battery pack is charging or discharging. For example, when the adapter is connected, its output voltage is stabilized by the voltage regulator DZ1 and then drives the transistor Q10 to turn on, so that the input terminal AN1 of the controller U4 receives a low-level signal, and the controller U4 works in the charging mode. On the contrary, when the adapter is unplugged, AN1 receives a high-level signal, and the controller U4 works in the discharge mode.

[0038] like Figure 5 As shown, the over-temperature detection circuit includes a thermistor NTC set in the lithium battery pack, the power supply end of the thermistor NTC is connected to the +5V power supply port, and the output end of the thermistor NTC is connected to the input end of the controller U4 and the analog switch chip U5. When the lithium battery pack is charging or discharging, the pin 13 of the controller U4 outputs a low level, and the temperature is converted into a voltage through the NTC to the chip U5, and then converted to the 16th pin of the MCU through the chip U5 to detect and judge the battery temperature. When the detection value exceeds the system safety value, the controller U4 performs over-temperature protection on the lithium battery pack, shuts down the power supply of the motor and the load, and then supplies power to the motor and the load when the temperature recovers.

[0039] The current detection control circuit includes a MOS tube Q12 connected to the battery power supply port M-, the gate of the MOS tube Q12 is connected to the output terminal P9 of the controller U4 through a resistor R53, the source of the MOS tube Q12 is grounded through a parallel resistor C32, resistors R57, R58, and connected to the base of the transistor Q13, the pin 17 of the controller U4 and the resistor R55, and one end of the capacitor C31 through a resistor R56, the collector of the transistor Q13 is connected to one end of the capacitor C29 and the pin 19 of the controller U4 through a resistor R52, and the emitter of the transistor Q13 is connected to the ground in parallel with the other end of the resistor R55, the capacitor C31, and C29. The current detection control circuit uses a resistor to detect the current, and feeds back the signal to the main control module for interrupt processing through the transistor Q13, thereby controlling the output, and at the same time, the controller performs AD sampling on the base signal of the transistor Q13. When the lithium battery pack overheats, outputs overcurrent, or the motor is short-circuited, pin 9 of the controller U4 outputs a low level, the MOS tube Q12 is turned off, and the lithium battery pack power output is turned off, thereby protecting the motor.

[0040] The voltage detection control circuit includes multiple detection branches with the same structure, and the detection branch includes a MOS tube Qj. The gate of the MOS tube Qj is connected to the pin 2 of the controller U4 through a resistor R54. The drain of the MOS tube Qj is connected through a resistor Rn and is only connected to the positive electrode of a different lithium battery. The source of the MOS tube Qj is grounded through a resistor Rm, and is connected to one end of the capacitor Cq and the input end of the analog switch chip U5 through a resistor Rp. The other end of the capacitor Cq is grounded. Among them, the number of detection branches is the same as the number of lithium batteries, that is, it includes 7 MOS tubes Qj, j∈ (2, 3, 4, 5, 6, 7, 8); 7 resistors Rn, n∈ (15, 16, 17, 18, 19, 20, 21); 7 resistors Rm, m∈ (30, 31, 32, 33, 34, 35, 36); 7 resistors Rp, p∈ (22, 23, 24, 25, 26, 27, 28); 7 capacitors Cq, q∈ (13, 14, 15, 16, 17, 18, 19). During the charging and discharging process of the lithium battery pack, pin 2 of the controller U4 outputs a high level, so that the gate of the MOS tube Qj is electrically turned on, and the positive electrode voltage of the lithium battery B1-B7 is input into the analog switch chip U5 through the resistor Rn and the MOS tube Qj in turn, which is used to detect the voltage of each lithium battery in the lithium battery pack and feed back the signal to the MCU of the controller U4 in proportional value. The MCU then compares it with the preset threshold to determine the power of each lithium battery.

[0041] The power indicator circuit includes indicator lights L3, L4, L5, and L6. The positive poles of indicator lights L3, L4, L5, and L6 are connected to the output end of controller U4 through resistors R36, R37, R38, and R39, respectively, and the negative poles of indicator lights L3, L4, L5, and L6 are grounded. During the discharge of the lithium battery pack, in order to reduce the standby power consumption, the MCU of controller U4 will be awakened only when the controller U4 detects that there is a discharge current passing through. When the adapter is not connected, the awakened controller MCU is in power saving mode, thereby reducing the battery standby current. The battery power is detected by the voltage detection circuit, and the battery power is displayed by the indicator light, that is, the indicator lights L3, L4, L5, and L6 light up when the power of the lithium battery pack is at 25%, 50%, 75%, and 100%, respectively.

[0042] In summary, the present invention provides charging voltage to the lithium battery pack when connected to the adapter, and provides voltage to the output DC motor or load at the same time, which helps to extend the service life of the lithium battery pack. Through the DC-DC boost circuit and the constant voltage and constant current buck circuit, the input and output voltages can work normally when they are close, and the lithium battery pack can be protected more reliably. The controller reduces the battery standby current through mode switching to ensure that the lithium battery can work normally after being left for a long time, and has functions such as battery overvoltage protection, undervoltage protection, overtemperature protection, and short circuit protection, which effectively improves the level of management and monitoring of the lithium battery pack and forms an overall reliable protection.

[0043] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A motor-driven battery pack management system, including a lithium battery pack, a control module, a charging and discharging module, and a detection and protection module, characterized in that: The lithium battery pack includes at least one lithium battery, and the control module includes a controller U4 and an analog switch chip U5 connected via a serial port; The charging and discharging module includes an adapter power interface and a battery power supply port. The positive terminal of the adapter power interface is connected to the +5V power supply circuit and the input terminal PW1 of the battery charging control circuit through a DC-DC boost circuit and a constant voltage and constant current buck circuit in sequence. The control terminal of the battery charging control circuit is connected to the output terminal P10 of the controller. The adapter power interface and the positive terminal of the lithium battery pack are connected to the battery power supply port M+ through diodes D1 and D2 respectively. The +5V power supply circuit is used to power the control module and the detection and protection module. The battery charging control circuit is used to control the charging and discharging state of the lithium battery pack. The DC-DC boost circuit includes a boost chip U1, wherein pin 3 of the boost chip U1 is connected to one end of the inductor L2 and the positive electrode of the diode D3, the other end of the inductor L2 is connected to one end of the capacitor C7 and EC3, the negative electrode of the diode D4 and pin 4 of the boost chip U1, the positive electrode of the diode D4 is connected to the positive end of the adapter power interface, the other ends of the capacitors C7 and EC3 and pin 1 of the boost chip U1 are connected to the negative end of the adapter power interface, the pin 3 of the boost chip U1 is also connected to the resistor R4 and one end of the capacitor EC2 through the diode D3, the other end of the resistor R4 is connected to one end of the resistor R6 and pin 5 of the boost chip U1, and the other ends of the resistor R6 and the capacitor EC2 are grounded; The constant voltage and constant current step-down circuit comprises a voltage stabilizing chip U2, wherein pin 2 of the voltage stabilizing chip U2 is connected to one end of capacitors C5 and EC2, pin 1 of the voltage stabilizing chip U2 is connected to resistor R2, capacitor C2, one end of inductor L1 and the drain of MOS tube Q1, the other end of resistor R2 is grounded through capacitor C1, the other end of capacitor C2 is connected to pin 5 of the voltage stabilizing chip U2, the other end of inductor L1 is connected to resistors R1, R3, one end of capacitor C3 and pin 6 of the voltage stabilizing chip U2, the other end of resistors R1 and R3 is connected to One end of capacitor C4 and EC1 is connected to pin 7 of voltage regulator chip U2, the other end of capacitor C3, C4 and EC1 is grounded, pin 3 of voltage regulator chip U2 is grounded through capacitor C8, pin 4 of voltage regulator chip U2 is connected to the gate of MOS tube Q1, the source of MOS tube Q1 is grounded, pin 7 of voltage regulator chip U2 is connected to one end of capacitor C6 and resistor R5 and the positive electrode of diode D5, pin 8 of voltage regulator chip U2 is connected to the other end of capacitor C6 and resistor R5, and is grounded through parallel resistors R7 and R8; The detection and protection module comprises: A charge and discharge detection circuit, used to detect the charge and discharge status of the lithium battery pack; An over-temperature detection circuit, used to detect the temperature of the lithium battery pack when it is working; A current detection control circuit, used to detect the output current of the lithium battery pack and control the output state of the battery power supply port through a controller; A voltage detection control circuit is used to detect the output voltage of the lithium battery pack and the output voltage of the over-temperature detection circuit, and control the charging state of the lithium battery pack through a controller; the voltage detection control circuit includes multiple detection branches with the same structure, and the detection branch includes a MOS tube Qj, the gate of the MOS tube Qj is connected to pin 2 of the controller U4 through a resistor R54, the drain of the MOS tube Qj is connected through a resistor Rn and is only connected to the positive electrode of a different lithium battery, the source of the MOS tube Qj is grounded through a resistor Rm, and is connected to one end of the capacitor Cq and the input end of the analog switch chip through a resistor Rp, and the other end of the capacitor Cq is grounded.

2. The motor-driven battery pack management system according to claim 1, characterized in that: The +5V power supply circuit includes a step-down chip U3, pin 1 of the step-down chip U3 is grounded through parallel capacitors C10 and C11, and is connected to the cathode of the diode D6 through resistors R11, R10, R9, R12, and R14 in sequence, the anode of the diode D6 is connected to the cathode of D5, pin 2 of the step-down chip U3 is grounded, pin 3 of the step-down chip U3 is connected to the +5V power supply port, and is grounded through parallel capacitors C12 and C20.

3. The motor-driven battery pack management system according to claim 2, characterized in that: The battery charging control circuit includes a MOS tube Q9, a drain of the MOS tube Q9 is connected to the cathode of the diodes D5 and D9 and one end of the resistor R43, a source of the MOS tube Q9 is connected to the positive end of the lithium battery pack and is connected to the cathode of D6 through a diode D8, a gate of the MOS tube Q9 is connected to the anode of the diode D9, the other end of the resistor R43 and one end of the resistor R45 through a resistor R41, the other end of the resistor R45 is connected to the collector of the transistor Q11, the base of the transistor Q11 is connected to one end of the resistors R49 and R51, the other end of the resistor R49 is connected to the output end P10 of the controller, and the emitter of the transistor Q11 and the other end of the resistor R51 are grounded.

4. The motor-driven battery pack management system according to claim 1, characterized in that: The charge and discharge detection circuit includes a transistor Q10, the collector of the transistor Q10 is connected to the input terminal AN1 of the controller through a resistor R42, the base of the transistor Q10 is connected to one end of resistors R21 and R40, the other end of the resistor R21 is connected to the positive end of the adapter power interface through a voltage regulator tube DZ1, and the emitter of the transistor Q10 and the other end of the resistor R40 are grounded.

5. The motor-driven battery pack management system according to claim 1, characterized in that: The over-temperature detection circuit includes a thermistor NTC disposed in the lithium battery pack, a power supply end of the thermistor NTC is connected to a +5V power supply port, and an output end of the thermistor NTC is connected to an input end of the controller U4 and an analog switch chip U5.

6. The motor-driven battery pack management system according to claim 1, characterized in that: The current detection control circuit includes a MOS tube Q12 connected to the battery power supply port M-, the gate of the MOS tube Q12 is connected to the output terminal P9 of the controller U4 through a resistor R53, the source of the MOS tube Q12 is grounded through a parallel resistor C32, resistors R57, and R58, and is connected to the base of the transistor Q13, the pin 17 of the controller U4 and the resistor R55 and one end of the capacitor C31 through a resistor R56, the collector of the transistor Q13 is connected to one end of the capacitor C29 and the pin 19 of the controller U4 through a resistor R52, and the emitter of the transistor Q13 is connected in parallel with the other ends of the resistor R55, the capacitor C31, and C29 to the ground.

7. The motor-driven battery pack management system according to any one of claims 1 to 6, characterized in that: It also includes a power indication circuit, which includes indicator lights L3, L4, L5, and L6. The positive poles of the indicator lights L3, L4, L5, and L6 are connected to the output end of the controller through resistors R36, R37, R38, and R39 respectively, and the negative poles of the indicator lights L3, L4, L5, and L6 are grounded.

Images