Charging and discharging protection circuit based on lithium super capacitor

Abstract

The utility model discloses a charging and discharging protection circuit based on a lithium super capacitor, which comprises a charging and discharging protection chip, the lithium super capacitor, a temperature protection configuration circuit, a current detection circuit, a discharging control circuit and a charging control circuit, the temperature protection configuration circuit monitors the temperature of the lithium super capacitor through a temperature sensor; the current detection circuit monitors the charging and discharging current of the lithium super capacitor through a current sensor; the discharge control circuit controls the discharge process of the lithium super capacitor; the charging control circuit is used for controlling the charging process of the lithium super capacitor; and the charging and discharging protection chip is responsible for comprehensively managing and controlling the charging and discharging process of the lithium super capacitor. According to the design of the charging and discharging protection circuit of the lithium super capacitor, the safety and the stability of the lithium super capacitor in the charging and discharging processes can be ensured, the service life of the lithium super capacitor is effectively prolonged, the safe and stable operation of a backup power supply of a smart energy unit terminal is ensured, and reliable power supply is provided when the terminal is powered down.

Description

Technical Field

[0001] This utility model belongs to the field of electricity information collection terminals and discloses a charge and discharge protection circuit based on lithium supercapacitor. Background Technology

[0002] A smart energy unit is a device or system that utilizes advanced technologies and intelligent systems to monitor, manage, and optimize energy use. Its system architecture typically includes the following main components: a data acquisition and monitoring module, an energy management and optimization module, an intelligent control and dispatch module, a data storage and analysis module, a user interface module, and a communication network. Specifically, smart energy unit applications can include terminals needed for the construction of new power systems, while also providing basic load management functions, power marketing technical support functions, and power demand-side management technical support functions. It can realize the acquisition of electricity meter data, monitoring of the operating status of electricity metering equipment and power quality, as well as monitoring of customer electricity load and energy consumption, achieving "monitorable, measurable, adjustable, and controllable" user energy status. Furthermore, smart energy units can be used in various application fields, such as industrial manufacturing, building energy management, and healthcare, to achieve refined energy management and improve energy efficiency through real-time monitoring and analysis of energy usage. Therefore, ensuring the stable operation of smart energy unit terminals is extremely important.

[0003] In existing technologies, lithium supercapacitors are used as backup power sources for smart energy unit terminals to ensure their stable operation. A lithium supercapacitor is a novel energy storage device that combines the characteristics of supercapacitors and lithium-ion batteries. This device combines the high power density and rapid charge / discharge characteristics of supercapacitors with the high energy density and long cycle life of lithium-ion batteries. Based on these characteristics, the safety and stability of lithium supercapacitors during charging and discharging must be ensured. Utility Model Content

[0004] The purpose of this utility model is to provide a charge and discharge protection circuit based on lithium supercapacitor to solve the above-mentioned problems existing in the prior art.

[0005] Technical solution: A charge / discharge protection circuit based on lithium supercapacitor, comprising:

[0006] Lithium supercapacitors provide the required voltage and capacity;

[0007] The temperature protection circuit monitors the temperature of the lithium supercapacitor using a temperature sensor to prevent overheating.

[0008] The current detection circuit monitors the charging and discharging current of the lithium supercapacitor through a current sensor to ensure that the current is within a safe range;

[0009] The discharge control circuit controls the discharge process of the lithium supercapacitor to ensure that the discharge current is within a safe range;

[0010] The charging control circuit controls the charging process of the lithium supercapacitor to ensure that the charging current is within a safe range.

[0011] The charge / discharge protection chip is responsible for the comprehensive management and control of the lithium supercapacitor's charge / discharge process. Based on feedback from the current detection circuit, it adjusts the operating state of the discharge control circuit to prevent overcurrent; based on feedback from the current detection circuit and the temperature protection configuration circuit, it adjusts the operating state of the charging control circuit to prevent overcurrent and overvoltage.

[0012] According to one aspect of this application, the lithium supercapacitor is composed of 2-5 lithium supercapacitor components connected in series.

[0013] According to one aspect of this application, the charge / discharge protection chip monitors the voltage of each lithium supercapacitor cell in the lithium supercapacitor and performs corresponding operations based on the monitored voltage, including overvoltage protection, undervoltage protection, overcurrent protection, overtemperature protection, and voltage equalization.

[0014] According to one aspect of this application, the over-temperature protection includes low-temperature charging protection, high-temperature charging protection, low-temperature discharging protection, and high-temperature discharging protection.

[0015] According to one aspect of this application, the charge / discharge protection circuit includes a charge / discharge protection chip U1, resistors R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, and R24, capacitors C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, and C17, and transistors Q1 and Q2. Diodes V3, V4, and V5 are used. Pins 1 and 2 of the charge / discharge protection chip U1 are grounded. Pin 3 of the charge / discharge protection chip U1 is connected to one end of resistor R7, and the other end of resistor R7 is grounded. Pin 4 of the charge / discharge protection chip U1 is connected to one end of resistor R8, and the other end of resistor R8 is grounded. Pin 5 of the charge / discharge protection chip U1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to one end of both resistors R10 and R12, and the other ends of resistors R10 and R12 are grounded. Pin 6 of the charge / discharge protection chip U1 is connected to one end of resistor R13, and the other end of resistor R13 is grounded. Pin 8 of the charge / discharge protection chip U1 is connected to one end of resistor R21, and resistor R21... The other end is grounded. Pin 9 of the charge / discharge protection chip U1 is connected to one end of resistor R15. The other end of resistor R15 is simultaneously connected to one end of resistor R17 and the positive terminal of diode V3. The other end of resistor R17 and the negative terminal of diode V3 are simultaneously connected to one end of resistor R22 and the negative terminal of diode V5. The other end of resistor R22 and the positive terminal of diode V5 are grounded. Pin 10 of the charge / discharge protection chip U1 is simultaneously connected to one end of resistor R18 and the negative terminal of diode V4. The other end of resistor R18 and the positive terminal of diode V4 are simultaneously connected to one end of resistor R23 and pin 4 of transistor Q2. The other end of resistor R23 and pins 3, 2, and 1 of transistor Q2 are simultaneously connected to one end of capacitor C17. Pins 5, 6, 7, and 8 of transistor Q2 and pins 5, 6, 7, and 8 of transistor Q1 are simultaneously connected to the other end of capacitor C17 and one end of capacitor C16. Pins 3, 2, and 1 of transistor Q1 are simultaneously connected to the other end of capacitor C16 and ground. Pin 4 of transistor Q1 is connected to one end of resistor R22. Pin 11 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitors C12 and C14 and one end of resistor R19. The other end of capacitor C14 is grounded. The other end of resistor R19 is simultaneously connected to one end of resistor R24 ​​and the other end of resistor R23. The other end of resistor R24 ​​is grounded. The other end of capacitor C12 is simultaneously connected to one end of resistor R20 and one end of capacitor C15.The other ends of resistor R20 and capacitor C15 are grounded. Pin 13 of the charge / discharge protection chip U1 is grounded. Pin 14 of the charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C8, capacitor C13, and resistor R16. The other end of capacitor C13 is grounded. The other end of resistor R16 is simultaneously connected to one end of capacitor C11 and ground. The other end of capacitor C8 is connected to pin 15 of the charge / discharge protection chip U1. Pin 15 of the charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C6, capacitor C10, and resistor R14. The other end of capacitor C10 is grounded. The other end of resistor R14 is simultaneously connected to the other end of capacitor C11 and one end of capacitor C9. The other end of capacitor C6 is connected to pin 16 of the charge / discharge protection chip U1. Pin 16 is simultaneously connected to one end of capacitors C5 and C7 and resistor R11. The other end of capacitor C7 is grounded. The other end of resistor R11 is simultaneously connected to the other end of capacitor C9 and one end of capacitor C4. The other end of capacitor C5 is connected to pin 17 of charge / discharge protection chip U1. Pin 17 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C3 and resistor R6. The other end of capacitor C3 is grounded. The other end of resistor R6 is simultaneously connected to the other end of capacitor C4 and voltage Vcap. Pin 20 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C2 and resistor R5. The other end of capacitor C2 is grounded. The other end of resistor R5 is simultaneously connected to pins 18 and 19 of charge / discharge protection chip U1 and voltage Vcap.

[0016] According to one aspect of this application, capacitors C4, C9 and C11 are all polarized capacitors.

[0017] According to one aspect of this application, the diode V5 is a Zener diode.

[0018] Beneficial effects: The charging and discharging protection circuit design of the lithium supercapacitor of this utility model can ensure the safety and stability of the lithium supercapacitor during charging and discharging, effectively extend the service life of the lithium supercapacitor, ensure the safe and stable operation of the backup power supply of the smart energy unit terminal, and provide a reliable power supply when the terminal loses power. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the hardware framework structure of the device of this utility model.

[0020] Figure 2 This is a schematic diagram of the equipment system structure of this utility model.

[0021] Figure 3 This is a circuit diagram for the charge and discharge protection of an embodiment of the present invention. Detailed Implementation

[0022] like Figure 1 As shown, this utility model proposes a charge / discharge protection circuit based on a lithium supercapacitor, including a charge / discharge protection chip, a lithium supercapacitor, a temperature protection configuration circuit, a current detection circuit, a discharge control circuit, and a charging control circuit. The lithium supercapacitor provides the required voltage and capacity; the temperature protection configuration circuit monitors the temperature of the lithium supercapacitor using a temperature sensor to prevent overheating; the current detection circuit monitors the charge / discharge current of the lithium supercapacitor using a current sensor to ensure the current remains within a safe range; the discharge control circuit controls the discharge process of the lithium supercapacitor to ensure the discharge current remains within a safe range; the charging control circuit controls the charging process of the lithium supercapacitor to ensure the charging current remains within a safe range; the charge / discharge protection chip is responsible for the comprehensive management and control of the charge / discharge process of the lithium supercapacitor, adjusting the operating state of the discharge control circuit based on feedback from the current detection circuit to prevent overcurrent; and adjusting the operating state of the charging control circuit based on feedback from the current detection circuit and the temperature protection configuration circuit to prevent overcurrent and overvoltage.

[0023] According to one aspect of this application, the lithium supercapacitor is composed of 2-5 lithium supercapacitor components connected in series.

[0024] According to one aspect of this application, the charge / discharge protection chip monitors the voltage of each lithium supercapacitor cell in the lithium supercapacitor and performs corresponding operations based on the monitored voltage, including overvoltage protection, overvoltage recovery, undervoltage protection, undervoltage recovery, charging overcurrent protection, discharging overcurrent protection, overtemperature protection, and voltage equalization.

[0025] Overvoltage protection is activated when the voltage of any lithium supercapacitor exceeds the set overcharge voltage threshold and the duration exceeds the set overcharge time. The charge / discharge protection chip's control output pin then becomes high-impedance.

[0026] Because the gate of the field-effect transistor (FET) in the charging control circuit has a pull-down resistor, its gate voltage is pulled down to the voltage of P- (or the negative terminal of the battery pack), thereby turning off the FET in the charging control circuit and stopping charging. However, in the overvoltage protection state, the FET in the discharge control circuit remains on, allowing the lithium supercapacitor to continue discharging (if the load is connected).

[0027] Overvoltage recovery: When the overvoltage protection voltage of all lithium supercapacitors drops below the set overcharge recovery voltage threshold and the duration exceeds the set overcharge recovery time, the charge / discharge protection chip will release from the overvoltage protection state and return to normal mode. In normal mode, the MOSFETs in the charging control circuit and the discharging control circuit can be turned on or off normally as needed.

[0028] Undervoltage protection: When the voltage of any lithium supercapacitor component falls below the set undervoltage protection threshold and the duration exceeds the set undervoltage protection time, the undervoltage protection state is activated. The charge / discharge protection chip controls the field-effect transistor pin of the discharge control circuit to output a low level, causing the field-effect transistor of the discharge control circuit to immediately turn off and stop the lithium supercapacitor from discharging.

[0029] Undervoltage recovery: When the voltage of all lithium supercapacitor devices rises above the set undervoltage recovery threshold and lasts for more than the set undervoltage recovery time, the charge / discharge protection chip will release from the undervoltage protection state and return to normal mode. In normal mode, the MOSFETs in the charging control circuit and the discharging control circuit can be turned on or off normally as needed.

[0030] Overcurrent protection during charging: When the charging current flows through the current sensing resistor of the current detection circuit, a voltage drop will be generated across the resistor. If this voltage drop exceeds a certain threshold for a sustained period of time, the overcurrent protection state will be triggered. The charge / discharge protection chip's control output pin becomes high impedance, turning off the MOSFET in the charging control circuit, thereby stopping charging. However, the MOSFET in the discharging control circuit remains on, allowing the lithium supercapacitor to continue supplying power to the connected load.

[0031] Discharge overcurrent protection: When the discharge current exceeds the set threshold and the duration exceeds the set time, the discharge overcurrent state will be triggered. At this time, the charge and discharge protection chip enters the discharge overcurrent protection state, and the pin of the field-effect transistor controlling the discharge control circuit will output a low level, causing the field-effect transistor of the discharge control circuit to be turned off, thereby cutting off the discharge path.

[0032] Over-temperature protection, also known as temperature protection: This integrates temperature protection functions during charging and discharging. These functions include:

[0033] Low-temperature charging protection: When the lithium supercapacitor temperature is lower than a certain set threshold, the charge and discharge protection chip will limit or stop the charging current to prevent the battery from being damaged at low temperatures.

[0034] High-temperature protection during charging: When the lithium overcapacitance temperature exceeds a certain set threshold, the charge and discharge protection chip will limit or stop the charging current to avoid lithium overheating and potential safety risks.

[0035] Low-temperature discharge protection: Similar to low-temperature charging protection, but this occurs during the discharge process. When the lithium supercapacitor temperature is too low, the charge / discharge protection chip will limit or stop the discharge current.

[0036] High-temperature discharge protection: Similar to high-temperature charging protection, but this occurs during the discharge process. When the battery temperature is too high, the protection module will limit or stop the discharge current.

[0037] The working principle of the charge and discharge protection chip is to detect the state of the resistance of the temperature protection configuration circuit through its internal periodic current source, thereby measuring the lithium overcapacitance or the ambient temperature.

[0038] Voltage balancing: The charge / discharge protection chip continuously monitors the voltage of each lithium supercapacitor cell. When the voltage of one or more lithium supercapacitor cells exceeds the balance threshold, but the voltage of other one or more lithium supercapacitor cells is below the balance threshold, the charge / discharge protection chip will turn on the internal balancing FET for the lithium supercapacitor cell with the voltage above the balance threshold, in order to reduce the charging current and narrow the voltage difference between the lithium supercapacitor cells.

[0039] like Figure 2 As shown, the charge / discharge protection circuit based on lithium supercapacitor serves as a backup power supply for the lithium supercapacitor. After the terminal is powered on, the AC-DC power circuit of the smart energy unit charges the lithium supercapacitor backup power supply and simultaneously supplies power to the system circuit of the smart energy unit. After power failure, the lithium supercapacitor backup power supply supplies power to the system circuit. This ensures the stable and reliable operation of the lithium supercapacitor as a backup power supply for the smart energy unit terminal.

[0040] like Figure 3As shown, according to one aspect of this application, the charge / discharge protection circuit includes a charge / discharge protection chip U1, resistors R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, capacitors C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, transistor Q1, transistor Q... 2. Diodes V3, V4, and V5. Pins 1 and 2 of the charge / discharge protection chip U1 are grounded. Pin 3 of the charge / discharge protection chip U1 is connected to one end of resistor R7, and the other end of resistor R7 is grounded. Pin 4 of the charge / discharge protection chip U1 is connected to one end of resistor R8, and the other end of resistor R8 is grounded. Pin 5 of the charge / discharge protection chip U1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to one end of both resistors R10 and R12, and the other ends of resistors R10 and R12 are grounded. Pin 6 of the charge / discharge protection chip U1 is connected to one end of resistor R13, and the other end of resistor R13 is grounded. Pin 8 of the charge / discharge protection chip U1 is connected to one end of resistor R21, and resistor R2... The other end of resistor 1 is grounded. Pin 9 of the charge / discharge protection chip U1 is connected to one end of resistor R15. The other end of resistor R15 is simultaneously connected to one end of resistor R17 and the positive terminal of diode V3. The other end of resistor R17 and the negative terminal of diode V3 are simultaneously connected to one end of resistor R22 and the negative terminal of diode V5. The other end of resistor R22 and the positive terminal of diode V5 are grounded. Pin 10 of the charge / discharge protection chip U1 is simultaneously connected to one end of resistor R18 and the negative terminal of diode V4. The other end of resistor R18 and the positive terminal of diode V4 are simultaneously connected to one end of resistor R23 and pin 4 of transistor Q2. The other end of resistor R23 and pins 3, 2, and 1 of transistor Q2 are simultaneously connected to one end of capacitor C17. Pins 5, 6, 7, and 8 of transistor Q2 and pins 5, 6, 7, and 8 of transistor Q1 are simultaneously connected to the other end of capacitor C17 and one end of capacitor C16. Pins 3, 2, and 1 of transistor Q1 are simultaneously connected to the other end of capacitor C16 and ground. Pin 4 of transistor Q1 is connected to one end of resistor R22. Pin 11 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitors C12 and C14 and one end of resistor R19. The other end of capacitor C14 is grounded. The other end of resistor R19 is simultaneously connected to one end of resistor R24 ​​and the other end of resistor R23. The other end of resistor R24 ​​is grounded. The other end of capacitor C12 is simultaneously connected to one end of resistor R20 and one end of capacitor C15.The other ends of resistor R20 and capacitor C15 are grounded. Pin 13 of the charge / discharge protection chip U1 is grounded. Pin 14 of the charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C8, capacitor C13, and resistor R16. The other end of capacitor C13 is grounded. The other end of resistor R16 is simultaneously connected to one end of capacitor C11 and ground. The other end of capacitor C8 is connected to pin 15 of the charge / discharge protection chip U1. Pin 15 of the charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C6, capacitor C10, and resistor R14. The other end of capacitor C10 is grounded. The other end of resistor R14 is simultaneously connected to the other end of capacitor C11 and one end of capacitor C9. The other end of capacitor C6 is connected to pin 16 of the charge / discharge protection chip U1. Pin 16 is simultaneously connected to one end of capacitors C5 and C7 and resistor R11. The other end of capacitor C7 is grounded. The other end of resistor R11 is simultaneously connected to the other end of capacitor C9 and one end of capacitor C4. The other end of capacitor C5 is connected to pin 17 of charge / discharge protection chip U1. Pin 17 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C3 and resistor R6. The other end of capacitor C3 is grounded. The other end of resistor R6 is simultaneously connected to the other end of capacitor C4 and voltage Vcap. Pin 20 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitor C2 and resistor R5. The other end of capacitor C2 is grounded. The other end of resistor R5 is simultaneously connected to pins 18 and 19 of charge / discharge protection chip U1 and voltage Vcap.

[0041] According to one aspect of this application, capacitors C4, C9 and C11 are all polarized capacitors.

[0042] According to one aspect of this application, the diode V5 is a Zener diode.

[0043] It should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A charge / discharge protection circuit based on lithium supercapacitor, characterized in that, include: Lithium supercapacitors provide the required voltage and capacity; The temperature protection circuit monitors the temperature of the lithium supercapacitor using a temperature sensor to prevent overheating. The current detection circuit monitors the charging and discharging current of the lithium supercapacitor through a current sensor to ensure that the current is within a safe range; The discharge control circuit controls the discharge process of the lithium supercapacitor to ensure that the discharge current is within a safe range; The charging control circuit controls the charging process of the lithium supercapacitor to ensure that the charging current is within a safe range. The charge / discharge protection chip is responsible for the comprehensive management and control of the lithium supercapacitor's charge / discharge process. Based on the feedback from the current detection circuit, it adjusts the operating state of the discharge control circuit to prevent overcurrent; based on the feedback from the current detection circuit and the temperature protection configuration circuit, it adjusts the operating state of the charging control circuit to prevent overcurrent and overvoltage. Pin 5 of the charge / discharge protection chip U1 is connected to one end of resistor R9. The other end of resistor R9 is connected to one end of resistors R10 and R12. The other ends of resistors R10 and R12 are grounded. The lithium supercapacitor is composed of 2-5 lithium supercapacitor components connected in series; The charge / discharge protection chip monitors the voltage of each lithium supercapacitor component in the lithium supercapacitor and performs corresponding operations based on the monitored voltage, including overvoltage protection, undervoltage protection, overcurrent protection, overtemperature protection, and voltage equalization. The over-temperature protection includes low temperature protection during charging, high temperature protection during charging, low temperature protection during discharging, and high temperature protection during discharging. During overvoltage protection, if the voltage of any lithium supercapacitor exceeds the set overcharge voltage threshold and the duration exceeds the set overcharge time, the overvoltage protection state is activated; the charge / discharge protection chip control output pin becomes a high impedance state. The field-effect transistor (FET) in the charging control circuit has a pull-down resistor at its gate. Its gate voltage will be pulled down to the voltage of P-, and the FET in the charging control circuit will turn off, stopping charging. In the overvoltage protection state, the FET in the discharge control circuit remains on, allowing the lithium supercapacitor to continue discharging. When the voltage of one or more lithium supercapacitor cells exceeds the balance threshold, but the voltage of another one or more lithium supercapacitor cells is below the balance threshold, the charge / discharge protection chip will turn on the internal balance FET for the lithium supercapacitor cell with the voltage above the balance threshold, in order to reduce the charging current and narrow the voltage difference between the lithium supercapacitor cells.

2. The charge / discharge protection circuit based on lithium supercapacitor according to claim 1, characterized in that, The charge / discharge protection circuit includes a charge / discharge protection chip U1, resistors R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, capacitors C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, transistors Q1 and Q2, and diodes V3 and V4. Diode V5, where pins 1 and 2 of charge / discharge protection chip U1 are grounded; pin 3 of charge / discharge protection chip U1 is connected to one end of resistor R7, the other end of resistor R7 is grounded; pin 4 of charge / discharge protection chip U1 is connected to one end of resistor R8, the other end of resistor R8 is grounded; pin 6 of charge / discharge protection chip U1 is connected to one end of resistor R13, the other end of resistor R13 is grounded; pin 8 of charge / discharge protection chip U1 is connected to one end of resistor R21, the other end of resistor R21 is grounded; pin 9 of charge / discharge protection chip U1 is connected to one end of resistor R15; the other end of resistor R15 is simultaneously connected to one end of resistor R17 and the positive terminal of diode V3; the other end of resistor R17 is simultaneously connected to the negative terminal of diode V3. One end of resistor R22 is connected to the negative terminal of diode V5, and the other end of resistor R22 and the positive terminal of diode V5 are grounded. Pin 10 of the charge / discharge protection chip U1 is simultaneously connected to one end of resistor R18 and the negative terminal of diode V4. The other end of resistor R18 and the positive terminal of diode V4 are simultaneously connected to one end of resistor R23 and pin 4 of transistor Q2. The other end of resistor R23 and pins 3, 2, and 1 of transistor Q2 are simultaneously connected to one end of capacitor C17. Pins 5, 6, 7, and 8 of transistor Q2 and pins 5, 6, 7, and 8 of transistor Q1 are simultaneously connected to the other end of capacitor C17 and one end of capacitor C16. Pins 3, 2, and 1 of transistor Q1 are simultaneously connected to... The other end of capacitor C16 is connected to ground. Pin 4 of transistor Q1 is connected to one end of resistor R22. Pin 11 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitors C12 and C14 and resistor R19. The other end of capacitor C14 is grounded. The other end of resistor R19 is simultaneously connected to one end of resistors R24 and R23. The other end of resistor R24 ​​is grounded. The other end of capacitor C12 is simultaneously connected to one end of resistor R20 and capacitor C15. The other ends of resistor R20 and capacitor C15 are grounded. Pin 13 of charge / discharge protection chip U1 is grounded. Pin 14 of charge / discharge protection chip U1 is simultaneously connected to one end of capacitors C8 and C13 and resistor R16. The other end of capacitor C13 is grounded.The other end of resistor R16 is connected to one end of capacitor C11 and ground. The other end of capacitor C8 is connected to pin 15 of charge / discharge protection chip U1. Pin 15 of charge / discharge protection chip U1 is also connected to one end of capacitors C6 and C10 and resistor R14. The other end of capacitor C10 is grounded. The other end of resistor R14 is also connected to the other end of capacitor C11 and one end of capacitor C9. The other end of capacitor C6 is connected to pin 16 of charge / discharge protection chip U1. Pin 16 of charge / discharge protection chip U1 is also connected to one end of capacitors C5 and C7 and resistor R11. The other end of capacitor C7 is grounded. The other end is connected to both the other end of capacitor C9 and one end of capacitor C4. The other end of capacitor C5 is connected to pin 17 of charge / discharge protection chip U1. Pin 17 of charge / discharge protection chip U1 is also connected to one end of capacitor C3 and resistor R6. The other end of capacitor C3 is grounded. The other end of resistor R6 is connected to the other end of capacitor C4 and voltage Vcap. Pin 20 of charge / discharge protection chip U1 is connected to one end of capacitor C2 and resistor R5. The other end of capacitor C2 is grounded. The other end of resistor R5 is connected to pins 18 and 19 of charge / discharge protection chip U1 and voltage Vcap.

3. The charge / discharge protection circuit based on lithium supercapacitor according to claim 2, characterized in that, Capacitors C4, C9, and C11 are all polarized capacitors.

4. The charge / discharge protection circuit based on lithium supercapacitor according to claim 2, characterized in that, The diode V5 is a Zener diode.

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