A single-cell lithium battery protection circuit

Abstract

This utility model discloses a single-cell lithium battery protection circuit, including a lithium battery charging circuit, a lithium battery protection control circuit, a battery detection circuit, a programming port circuit, a button indicator light interface circuit, a charging detection circuit, a DC brushed motor circuit, and a gyroscope circuit. The lithium battery charging circuit includes connector CN1, diode D2, capacitor C4, resistor R2, resistor R3, capacitor C5, and integrated circuit U2. The lithium battery protection control circuit includes integrated circuit U3, resistor R4, capacitor C6, connector CN3, connector CN2, and resistor R5. This utility model's single-cell lithium battery protection circuit, by setting up a charging detection circuit and a battery detection circuit, evaluates the lifespan of a single-cell lithium battery in real time based on the voltage, current, and internal resistance parameters under different conditions, and provides warnings through the button indicator light interface circuit, facilitating timely maintenance of the single-cell lithium battery and extending its lifespan.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery protection circuit technology, specifically a single-cell lithium battery protection circuit. Background Technology

[0002] The core function of a lithium battery protection circuit is to monitor key parameters such as battery voltage, current, and temperature. By cutting off the charging and discharging circuit or adjusting the circuit state, it prevents the battery from being damaged or posing safety hazards due to overcharging, over-discharging, short circuits, or abnormal temperatures. When the battery voltage exceeds the safety threshold, which is usually 4.25V, the protection circuit will immediately cut off the charging circuit to prevent electrolyte decomposition from causing an increase in internal pressure or an explosion. When the battery voltage is below 2.3V, the protection circuit will stop discharging to avoid electrolyte decomposition leading to battery capacity decay and shortened lifespan.

[0003] However, traditional lithium battery protection circuits have the following drawbacks:

[0004] Traditional lithium battery protection circuits only regulate the current and voltage supplied by the lithium battery, and cannot detect the battery's own information in real time. As a result, users cannot perform timely maintenance and repairs on the lithium battery, which shortens its lifespan. Utility Model Content

[0005] The purpose of this invention is to provide a single-cell lithium battery protection circuit to solve the problem mentioned in the background art that traditional lithium battery protection circuits only regulate the current and voltage delivered by the lithium battery, and cannot detect the lithium battery's own information in real time, making it impossible for users to perform timely maintenance and repairs on the lithium battery, thus shortening the lithium battery's service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a single-cell lithium battery protection circuit, comprising a lithium battery charging circuit, a lithium battery protection control circuit, a battery detection circuit, a programming port circuit, a button indicator interface circuit, a charging detection circuit, a DC brushed motor circuit, and a gyroscope circuit. The lithium battery charging circuit includes connector CN1, diode D2, capacitor C4, resistor R2, resistor R3, capacitor C5, and integrated circuit U2. The lithium battery protection control circuit includes integrated circuit U3, resistor R4, capacitor C6, connector CN3, connector CN2, and resistor R5. The battery detection circuit... The circuit includes resistors R6 and R7 and capacitor C7. The programming port circuit has a connector CON5, and pin 5 of the connector CON5 is grounded. The button indicator interface circuit includes connector CN5, resistor R10, capacitor C8, resistor R15, and resistor R11. The charging detection circuit includes resistors R8 and R9. The DC brushed motor circuit includes transistor Q1, inductor L1, capacitor C9, diode D1, connectors CN7 and CN6, resistors R12 and R13. The gyroscope circuit includes integrated circuit U, resistors R6 and R7, and diode D2.

[0007] Preferably, pin 4 of integrated circuit U2 is connected to one end of resistor R3, pin 6 of integrated circuit U2 is connected to one end of resistor R2, pin 1 of integrated circuit U2 is connected to one end of capacitor C5, pin 7 of integrated circuit U2 is connected to one end of capacitor C4, one end of diode D2 and pin B9 of connector CN1 respectively, and the other ends of capacitor C5, resistor R2, capacitor C4, diode D2, pin B12 of connector CN1 and pin A12 of connector CN1 are all grounded.

[0008] Preferably, pin 3 of the integrated circuit U3 is connected to one end of resistor R4 and one end of capacitor C6, the other end of resistor R4 is connected to pin 2 of connector CN2 and pin 1 of connector CN3, pin 5 of the integrated circuit U3 is connected to one end of resistor R5, and the other end of resistor R5 and pin 6 of integrated circuit U3 are both grounded.

[0009] Preferably, one end of resistor R6 is connected to one end of resistor R7 and one end of capacitor C7, and the other ends of resistor R7 and capacitor C7 are both grounded.

[0010] Preferably, pin 1 of connector CN5 is connected to one end of resistor R10, pin 2 of connector CN5 is connected to one end of capacitor C8, pin 4 of connector CN5 is connected to one end of resistor R11, and pin 3 of connector CN5 and the other end of capacitor C8 are both grounded.

[0011] Preferably, one end of resistor R8 is connected to one end of resistor R9, the other end of resistor R9 is grounded, pin 1 of transistor Q1 is connected to one end of resistor R12 and one end of resistor R13, pin 3 of transistor Q1 is connected to one end of capacitor C9, one end of diode D1 and one end of connector CN7, the other end of capacitor C9 is connected to one end of inductor L1, the other end of inductor L1 is connected to the other end of diode D1 and one end of connector CN6, and the other end of resistor R13 is grounded.

[0012] Preferably, pin 2 of integrated circuit U is connected to one end of resistor R6, pin 3 of integrated circuit U is connected to the other end of resistor R6, pin 12 of integrated circuit U is connected to one end of resistor R7, pin 11 of integrated circuit U is connected to the other end of resistor R7, pin 7 of integrated circuit U is connected to one end of diode D2, and pins 1, 4, 8 and 9 of integrated circuit U are all grounded.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by setting up a charging detection circuit and a battery detection circuit, the voltage, current and internal resistance parameters of a single lithium battery under different conditions are evaluated in real time to assess the lifespan of a single lithium battery, and warnings are given through the button indicator interface circuit, which makes it convenient for users to maintain the single lithium battery in a timely manner and extend the lifespan of the lithium battery. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the architecture of this utility model;

[0015] Figure 2 This is a circuit diagram of the lithium battery charging circuit of this utility model;

[0016] Figure 3 This is a circuit diagram of the lithium battery protection and control circuit of this utility model;

[0017] Figure 4 This is a circuit diagram of the battery detection circuit of this utility model;

[0018] Figure 5 This is a circuit diagram of the programming port circuit of this utility model;

[0019] Figure 6 This is a circuit diagram of the button indicator light interface circuit of this utility model;

[0020] Figure 7 This is a circuit diagram of the charging detection circuit of this utility model;

[0021] Figure 8 This is a circuit diagram of the DC brushed motor circuit of this utility model;

[0022] Figure 9 This is a circuit diagram of the gyroscope circuit of this utility model;

[0023] Figure 10 This is a circuit diagram of the conventional protection circuit of this utility model. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Please see Figure 1-10 This utility model provides a single-cell lithium battery protection circuit, including a lithium battery charging circuit, a lithium battery protection control circuit, a battery detection circuit, a programming port circuit, a button indicator interface circuit, a charging detection circuit, a DC brushed motor circuit, and a gyroscope circuit. The lithium battery charging circuit includes connector CN1, diode D2, capacitor C4, resistor R2, resistor R3, capacitor C5, and integrated circuit U2. The lithium battery protection control circuit includes integrated circuit U3, resistor R4, capacitor C6, connector CN3, connector CN2, and resistor R5. The battery detection circuit includes... The circuit includes resistors R6 and R7, capacitor C7, and a connector CON5 within the programming port circuit. Pin 5 of connector CON5 is grounded. The button indicator interface circuit includes connector CN5, resistor R10, capacitor C8, resistor R15, and resistor R11. The charging detection circuit includes resistors R8 and R9. The DC brushed motor circuit includes transistor Q1, inductor L1, capacitor C9, diode D1, connectors CN7 and CN6, resistors R12 and R13. The gyroscope circuit includes integrated circuit U, resistors R6 and R7, and diode D2.

[0026] Pin 4 of integrated circuit U2 is connected to one end of resistor R3, pin 6 of integrated circuit U2 is connected to one end of resistor R2, pin 1 of integrated circuit U2 is connected to one end of capacitor C5, pin 7 of integrated circuit U2 is connected to one end of capacitor C4, one end of diode D2 and pin B9 of connector CN1 respectively, and the other ends of capacitor C5, resistor R2, capacitor C4, diode D2, pin B12 of connector CN1 and pin A12 of connector CN1 are all grounded.

[0027] Pin 3 of integrated circuit U3 is connected to one end of resistor R4 and one end of capacitor C6, respectively. The other end of resistor R4 is connected to pin 2 of connector CN2 and pin 1 of connector CN3, respectively. Pin 5 of integrated circuit U3 is connected to one end of resistor R5. The other end of resistor R5 and pin 6 of integrated circuit U3 are both grounded.

[0028] One end of resistor R6 is connected to one end of resistor R7 and one end of capacitor C7, and the other ends of resistor R7 and capacitor C7 are grounded.

[0029] Pin 1 of connector CN5 is connected to one end of resistor R10; pin 2 of connector CN5 is connected to one end of capacitor C8; pin 4 of connector CN5 is connected to one end of resistor R11; and pin 3 of connector CN5 and the other end of capacitor C8 are both grounded.

[0030] One end of resistor R8 is connected to one end of resistor R9, and the other end of resistor R9 is grounded. One pin of transistor Q1 is connected to one end of resistor R12 and one end of resistor R13. One pin of transistor Q1 is connected to one end of capacitor C9, one end of diode D1 and one end of connector CN7. The other end of capacitor C9 is connected to one end of inductor L1. The other end of inductor L1 is connected to the other end of diode D1 and one end of connector CN6. The other end of resistor R13 is grounded.

[0031] Pin 2 of integrated circuit U is connected to one end of resistor R6, pin 3 of integrated circuit U is connected to the other end of resistor R6, pin 12 of integrated circuit U is connected to one end of resistor R7, pin 11 of integrated circuit U is connected to the other end of resistor R7, pin 7 of integrated circuit U is connected to one end of diode D2, and pins 1, 4, 8 and 9 of integrated circuit U are all grounded.

[0032] In this embodiment, the lithium battery charging circuit not only completes the lithium battery charging function but also has a charging status indicator function and can set the charging current. The lithium battery protection control circuit monitors key parameters such as battery voltage and current in real time and takes protective measures quickly when abnormalities are detected to ensure safe battery operation and extend battery life. The battery detection circuit assesses the remaining power by monitoring key battery parameters such as voltage, current, and internal resistance to ensure battery safety and extend battery life. The programming port circuit charges the lithium battery by increasing the voltage from low voltage to high voltage. The button indicator interface circuit is used to control the battery's start and stop. When operating the lithium battery device, the user needs to activate or deactivate the battery using a button to achieve normal operation or energy saving of the device, and the indicator light shows the operating status of the lithium battery. The charging detection circuit monitors the charging current in real time. When the current is too high, the control circuit will quickly cut off the charging circuit to prevent the battery from being overcharged and damaged. The DC brushed motor circuit provides over-temperature protection and automatically shuts off the load current when the temperature is too high. However, in the absence of short-circuit protection, additional measures need to be taken to prevent circuit damage. The gyroscope circuit provides key data such as attitude control and motion detection for the system by detecting changes in angular velocity or angular displacement.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-cell lithium battery protection circuit, comprising a lithium battery charging circuit, a lithium battery protection control circuit, a battery detection circuit, a programming port circuit, a button indicator interface circuit, a charging detection circuit, a DC brushed motor circuit, and a gyroscope circuit, characterized in that: The lithium battery charging circuit includes connector CN1, diode D2, capacitor C4, resistor R2, resistor R3, capacitor C5, and integrated circuit U2. The lithium battery protection control circuit includes integrated circuit U3, resistor R4, capacitor C6, connector CN3, connector CN2, and resistor R5. The battery detection circuit includes resistor R6, resistor R7, and capacitor C7. The programming port circuit has connector CON5, and pin 5 of connector CON5 is grounded. The button indicator interface circuit includes connector CN5, resistor R10, capacitor C8, resistor R15, and resistor R11. The charging detection circuit includes resistor R8 and resistor R9. The DC brushed motor circuit includes transistor Q1, inductor L1, capacitor C9, diode D1, connector CN7, connector CN6, resistor R12, and resistor R13. The gyroscope circuit includes integrated circuit U, resistor R6, resistor R7, and diode D2.

2. The single-cell lithium battery protection circuit according to claim 1, characterized in that: Pin 4 of integrated circuit U2 is connected to one end of resistor R3, pin 6 of integrated circuit U2 is connected to one end of resistor R2, pin 1 of integrated circuit U2 is connected to one end of capacitor C5, pin 7 of integrated circuit U2 is connected to one end of capacitor C4, one end of diode D2 and pin B9 of connector CN1, and the other ends of capacitor C5, resistor R2, capacitor C4, diode D2, pin B12 of connector CN1 and pin A12 of connector CN1 are all grounded.

3. The single-cell lithium battery protection circuit according to claim 1, characterized in that: The three pins of the integrated circuit U3 are connected to one end of the resistor R4 and one end of the capacitor C6, respectively. The other end of the resistor R4 is connected to the two pins of the connector CN2 and the one pin of the connector CN3, respectively. The five pins of the integrated circuit U3 are connected to one end of the resistor R5. The other end of the resistor R5 and the six pins of the integrated circuit U3 are both grounded.

4. The single-cell lithium battery protection circuit according to claim 1, characterized in that: One end of resistor R6 is connected to one end of resistor R7 and one end of capacitor C7, and the other ends of resistor R7 and capacitor C7 are both grounded.

5. A single-cell lithium battery protection circuit according to claim 1, characterized in that: Pin 1 of connector CN5 is connected to one end of resistor R10, pin 2 of connector CN5 is connected to one end of capacitor C8, pin 4 of connector CN5 is connected to one end of resistor R11, and pin 3 of connector CN5 and the other end of capacitor C8 are both grounded.

6. The single-cell lithium battery protection circuit according to claim 1, characterized in that: One end of resistor R8 is connected to one end of resistor R9, and the other end of resistor R9 is grounded. One pin of transistor Q1 is connected to one end of resistor R12 and one end of resistor R13. One pin of transistor Q1 is connected to one end of capacitor C9, one end of diode D1 and one end of connector CN7. The other end of capacitor C9 is connected to one end of inductor L1. The other end of inductor L1 is connected to the other end of diode D1 and one end of connector CN6. The other end of resistor R13 is grounded.

7. A single-cell lithium battery protection circuit according to claim 1, characterized in that: Pin 2 of integrated circuit U is connected to one end of resistor R6, pin 3 of integrated circuit U is connected to the other end of resistor R6, pin 12 of integrated circuit U is connected to one end of resistor R7, pin 11 of integrated circuit U is connected to the other end of resistor R7, pin 7 of integrated circuit U is connected to one end of diode D2, and pins 1, 4, 8 and 9 of integrated circuit U are all grounded.

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