Battery disassembly detection circuit

Abstract

The utility model discloses a battery disassembly detection circuit, which comprises a main control chip, a detachable battery, an energy storage circuit, a mos tube circuit I, a mos tube circuit II, a mos tube circuit III, a voltage detection circuit and a voltage dividing and current limiting circuit, the positive electrode of the detachable battery is electrically connected with the corresponding ends of the second mos tube circuit, the voltage dividing and current limiting circuit, the voltage detection circuit and the first mos tube circuit, the NTC end of the detachable battery is correspondingly and electrically connected with the NTC detection end of the main control chip, and the negative electrode of the detachable battery is grounded. The corresponding end of the mos tube circuit II is also electrically connected with the corresponding end of a voltage detection circuit; the input end of the main control chip is electrically connected with the corresponding ends of the voltage detection circuit, the first mos tube circuit and the energy storage circuit. According to the utility model, through accurate battery disassembly detection, the capability of the battery management system is enhanced, and the battery power supply equipment is ensured to respond in time when the battery is disassembled.

Description

Technical Field

[0001] This utility model relates to the field of battery disassembly and testing technology, and in particular to a battery disassembly and testing circuit. Background Technology

[0002] With the widespread use of portable electronic devices, battery-powered devices have become an indispensable part of our daily lives. These devices rely on built-in batteries to provide a stable power source to ensure their normal operation. However, existing battery-powered devices face some significant challenges in battery management.

[0003] First, many devices lack effective battery removal detection mechanisms. This means that when the battery is accidentally removed or replaced, the device is unable to identify the situation in time and take appropriate measures. Since the battery is the main power source for the device, a sudden power outage may damage sensitive electronic components or cause the loss of data being processed, leading to system instability or crashes.

[0004] Secondly, existing battery management systems cannot respond promptly after battery removal. A sudden drop in battery voltage can damage the circuitry, especially without proper protection. This voltage drop can cause a surge in current within the circuit, leading to overheating or damage to components.

[0005] These issues not only affect the reliability and lifespan of the equipment but also increase maintenance costs and user inconvenience. Users may need to frequently repair or replace the equipment to resolve problems caused by improper battery removal. Furthermore, the instability of the equipment and the risk of data loss also reduce user satisfaction. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a battery disassembly detection circuit.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] This utility model provides a battery disassembly detection circuit, including: a main control chip, a removable battery, an energy storage circuit, a MOSFET circuit one, a MOSFET circuit two, a MOSFET circuit three, a voltage detection circuit, and a voltage divider and current limiting circuit.

[0009] The positive terminal of the removable battery is electrically connected to the corresponding terminals of MOSFET circuit two, voltage divider and current limiting circuit, voltage detection circuit, and MOSFET circuit one, respectively. The NTC terminal of the removable battery is electrically connected to the NTC detection terminal of the main control chip, and the negative terminal of the removable battery is grounded. The corresponding terminal of MOSFET circuit two is also electrically connected to the corresponding terminal of the voltage detection circuit.

[0010] The input terminal of the main control chip is also electrically connected to the corresponding terminals of the voltage detection circuit, MOSFET circuit one, and energy storage circuit, respectively. The battery detection terminal of the main control chip is also electrically connected to the corresponding terminal of the voltage divider and current limiting circuit. The corresponding terminal of MOSFET circuit three is also electrically connected to the corresponding terminals of the voltage divider and current limiting circuit and MOSFET circuit one, respectively.

[0011] Preferably, the main control chip is a CS8M323.

[0012] Preferably, the first MOSFET circuit includes a MOSFET Q1 and a resistor R1; the source of the MOSFET Q1 is electrically connected to the first terminal of the resistor R1, the corresponding terminal of the energy storage circuit, and the VBAT_IN pin of the main control chip, respectively; the drain of the MOSFET Q1 is electrically connected to the corresponding terminal of the voltage detection circuit, the corresponding terminal of the voltage divider and current limiting circuit, and the positive terminal of the removable battery, respectively; and the gate of the MOSFET Q1 is electrically connected to the corresponding terminal of the third MOSFET circuit and the second terminal of the resistor R1, respectively.

[0013] Preferably, the energy storage circuit includes a capacitor C1, the first end of which is electrically connected to the source of the MOSFET Q1, and the second end of the capacitor C1 is grounded.

[0014] Preferably, the voltage detection circuit includes a transistor Q3 and a resistor R7;

[0015] The first pin of transistor Q3 is electrically connected to the drain of MOSFET Q1 via resistor R7. The second pin of transistor Q3 is electrically connected to the VBAT_IN pin of the main control chip. The third pin of transistor Q3 is electrically connected to the corresponding terminal of MOSFET circuit two.

[0016] Preferably, the second MOSFET circuit includes a MOSFET Q2, a resistor R2, and a resistor R3; the drain of the MOSFET Q2 is electrically connected to the positive terminal of the removable battery via a resistor R4, the source of the MOSFET Q2 is grounded, and the gate of the MOSFET Q2 is electrically connected to the third pin of the transistor Q3 via a resistor R3.

[0017] Preferably, the MOSFET circuit includes MOSFET Q4; the drain of MOSFET Q4 is electrically connected to the gate of MOSFET Q1, the source of MOSFET Q4 is grounded, and the gate of MOSFET Q4 is electrically connected to the corresponding terminal of the voltage divider and current limiting circuit.

[0018] Preferably, the voltage divider and current limiting circuit includes resistors R2, R5, R6, R8, and capacitor C2; the first terminal of capacitor C2 is electrically connected to the positive terminal of the removable battery, the first terminal of resistor R5, the first terminal of resistor R2, and the drain of MOSFET Q1, and the second terminal of capacitor C2 is grounded; the second terminal of resistor R5 is electrically connected to the battery detection terminal of the main control chip and the first terminal of resistor R6, and the second terminal of resistor R6 is grounded; the second terminal of resistor R2 is electrically connected to the gate of MOSFET Q4 and the first terminal of resistor R8, and the second terminal of resistor R8 is grounded.

[0019] The technical solution of this utility model has the following beneficial effects:

[0020] This invention enhances the capabilities of the battery management system through precise battery disassembly detection, ensuring that the battery-powered equipment can respond promptly when the battery is disassembled and can automatically check the battery disassembly action.

[0021] This invention improves power continuity by using a storage capacitor C1 to store the power supply of the VSYS network, ensuring that the system can continue to operate for a period of time after the battery is removed.

[0022] This invention can accurately detect battery removal events and trigger protection mechanisms in a timely manner by monitoring the drop in VBAT network voltage.

[0023] Power isolation and protection: After the battery is removed, MOSFET Q1 can isolate the VBAT and VSYS networks to prevent the drop in VBAT voltage from affecting the VSYS network, thereby protecting the stable operation of the system. When the voltage difference between the VBAT and VSYS networks reaches a certain value, MOSFET Q1 is turned off, and the energy storage capacitor C1 continues to supply power to the VSYS network, ensuring the stable operation of the main control system.

[0024] This invention uses a voltage detection circuit composed of transistor Q3 and resistor R7 to accurately monitor changes in the VBAT network voltage and respond promptly to battery removal.

[0025] Rapid Discharge and Safety: When the VBAT voltage drops to a certain level, the conduction of MOSFET Q2 can quickly release the residual voltage and safely discharge through resistor R4, reducing the voltage surge that may occur after battery removal.

[0026] This invention helps reduce long-term maintenance costs and repair frequency by minimizing the impact of battery removal on the device. It also improves user satisfaction with the device and reduces user dissatisfaction caused by device malfunctions by providing a more stable and reliable battery removal experience. Attached Figure Description

[0027] Figure 1This is a circuit diagram of the present invention;

[0028] Figure 2 This is the circuit schematic diagram of the main control chip of this utility model. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Reference Figures 1 to 2 This utility model provides a battery disassembly detection circuit, including: a main control chip 100, a removable battery 200, an energy storage circuit 300, a MOSFET circuit 1 400, a MOSFET circuit 2 500, a MOSFET circuit 3 600, a voltage detection circuit 700, and a voltage divider and current limiting circuit 800.

[0035] The positive terminal of the removable battery 200 is electrically connected to the corresponding terminals of MOSFET circuit 2 (500), voltage divider and current limiting circuit 800, voltage detection circuit 700, and MOSFET circuit 1 (400). The NTC terminal of the removable battery 200 is electrically connected to the NTC detection terminal of the main control chip 100, and the negative terminal of the removable battery 200 is grounded. The corresponding terminal of MOSFET circuit 2 (500) is also electrically connected to the corresponding terminal of voltage detection circuit 700. By electrically connecting the positive terminal of the removable battery 200 to MOSFET circuit 2 (500), voltage divider and current limiting circuit 800, voltage detection circuit 700, and MOSFET circuit 1 (400), the circuit can monitor the voltage and current status of the battery in real time. The electrical connection between the NTC terminal of the removable battery and the NTC detection terminal of the main control chip 100 allows the main control chip 100 to monitor the battery temperature, prevent overheating, and improve the safety of battery use.

[0036] The input terminals of the main control chip 100 are electrically connected to the corresponding terminals of the voltage detection circuit 700, MOSFET circuit 400, and energy storage circuit 300, respectively. The battery detection terminal of the main control chip 100 is also electrically connected to the corresponding terminal of the voltage divider and current limiting circuit 800. The corresponding terminal of MOSFET circuit 600 is also electrically connected to the corresponding terminals of the voltage divider and current limiting circuit 800 and MOSFET circuit 400, respectively. The main control chip 100, as the control center of the circuit, is responsible for receiving signals from each detection circuit and processing them according to preset logic, monitoring battery voltage and temperature to ensure the battery operates within a safe range. The voltage detection circuit 700 monitors the battery voltage and promptly notifies the main control chip 100 to take protective measures when an abnormal voltage is detected or the battery is removed. The voltage divider and current limiting circuit 800 is used for voltage division and current limiting to protect the circuit from excessive voltage or current. The energy storage circuit 300 provides temporary power when the battery is removed or the voltage drops, ensuring stable system operation and preventing data loss or system crashes due to sudden power interruptions.

[0037] Furthermore, the main control chip 100 is model CS8M323; the main control chip 100, as the control center of the circuit, is responsible for receiving signals from various detection circuits, processing them according to preset logic, monitoring battery voltage and temperature, and ensuring that the battery is within a safe operating range.

[0038] Furthermore, MOSFET circuit 400 includes MOSFET Q1 and resistor R1. The source of MOSFET Q1 is electrically connected to the first terminal of resistor R1, the corresponding terminal of energy storage circuit 300, and the VBAT_IN pin of the main control chip. The drain of MOSFET Q1 is electrically connected to the corresponding terminal of voltage detection circuit, the corresponding terminal of voltage divider and current limiting circuit 800, and the positive terminal of removable battery 200. The gate of MOSFET Q1 is electrically connected to the corresponding terminal of MOSFET circuit 600 and the second terminal of resistor R1. MOSFET Q1 acts as a switching element in the circuit, with its source connected to the VBAT_IN pin of energy storage circuit 300 and main control chip 100, allowing a stable power supply to the system when the battery is normally connected. The drain of MOSFET Q1 is connected to the voltage detection circuit and the voltage divider and current limiting circuit 800. The current-current circuit connection allows the main control chip to monitor the battery voltage via the VBAT_IN pin, ensuring the battery voltage remains within a safe range. In the event of battery removal or abnormal voltage, MOSFET Q1 can cut off the power supply, preventing current from continuing to flow into the circuit and thus protecting it from damage. The gate of MOSFET Q1 is connected to the corresponding terminal of MOSFET circuit 3 (600) and the second terminal of resistor R1, allowing MOSFET circuit 3 to control the switching state of MOSFET Q1, achieving precise power supply control. This design allows the battery removal detection circuit to respond quickly in the event of battery removal or abnormal voltage, cutting off the power supply through the switching action of MOSFET Q1 to protect the circuit from damage, while simultaneously monitoring the battery voltage in real time via the VBAT_IN pin of the main control chip 100 to ensure the battery remains within a safe operating range.

[0039] Furthermore, the energy storage circuit 300 includes a capacitor C1. The first terminal of the capacitor C1 is electrically connected to the source of the MOSFET Q1, and the second terminal of the capacitor C1 is grounded. The capacitor C1 is used to store the power supply of the VSYS network. When the battery is removed, the power supply of the VSYS network can be provided by the power stored in the capacitor C1. It is recommended that the capacity of C1 be 220uF or more, depending on the power consumption of the entire system and the required power supply time to the system.

[0040] Furthermore, the voltage detection circuit 700 includes a transistor Q3 and a resistor R7. Pin 1 of transistor Q3 is electrically connected to the drain of MOSFET Q1 via resistor R7. Pin 2 of transistor Q3 is electrically connected to the VBAT_IN pin of the main control chip, and pin 3 of transistor Q3 is electrically connected to the corresponding terminal of MOSFET circuit two. When the battery is removed, the voltage of the VBAT battery network begins to drop. The transistor Q3 and resistor R7 in the voltage detection circuit 700 are used to monitor this voltage change. They not only monitor the drop in battery voltage but also trigger the conduction of Q2 through the conduction of Q3, achieving rapid discharge of the residual voltage in the VBAT network. This process helps protect the circuit and prevents damage to the system from residual voltage after battery removal.

[0041] Furthermore, the MOSFET circuit 2500 includes MOSFET Q2, resistors R2 and R3. The drain of MOSFET Q2 is electrically connected to the positive terminal of the removable battery via resistor R4. When Q2 is turned on, it provides a discharge path from the battery positive terminal to ground, allowing the residual voltage of the VBAT network to be released quickly. The source of MOSFET Q2 is grounded, and the gate of MOSFET Q2 is electrically connected to pin 3 of transistor Q3 via resistor R3. When Q3 is turned on, it provides a high level to the gate of Q2, turning on Q2 and thus controlling the discharge process of the VBAT network. After the battery is removed, the conduction of MOSFET Q2 helps to discharge quickly, reducing the voltage surge during battery removal and protecting other components in the circuit.

[0042] Furthermore, the MOSFET circuit 3600 includes MOSFET Q4; the drain of MOSFET Q4 is electrically connected to the gate of MOSFET Q1, the source of MOSFET Q4 is grounded, and the gate of MOSFET Q4 is electrically connected to the corresponding terminal of the voltage divider and current limiting circuit; MOSFET Q4 is used to detect whether the battery has been removed. When the battery is removed, the voltage of the VBAT network begins to drop, while the voltage of the VSYS network drops more slowly due to the energy stored in capacitor C1. When the VBAT voltage drops to a certain level and is insufficient to maintain the conduction of MOSFET Q4, Q4 will turn off. This causes the gate and source (S) potentials of Q1 to be equal, causing Q1 to also turn off, thereby isolating the VBAT and VSYS networks and preventing the voltage drop of VBAT from affecting the VSYS network.

[0043] Furthermore, the voltage divider and current limiting circuit 800 includes resistors R2, R5, R6, R8, and capacitor C2. The first terminal of capacitor C2 is electrically connected to the positive terminal of the removable battery, the first terminal of resistor R5, the first terminal of resistor R2, and the drain of MOSFET Q1. The second terminal of capacitor C2 is grounded. The second terminal of resistor R5 is electrically connected to the battery detection terminal of the main control chip and the first terminal of resistor R6. The second terminal of resistor R6 is grounded. The second terminal of resistor R2 is electrically connected to the gate of MOSFET Q4 and the first terminal of resistor R8. The second terminal of resistor R8 is grounded. The design of the voltage divider and current limiting circuit 800 ensures a rapid response in the event of battery removal or abnormal voltage. It protects the main control chip through voltage division and current limiting, while providing a stable gate drive voltage for MOSFET Q4, thus achieving precise control of the power supply.

[0044] Working principle of this utility model:

[0045] Capacitor C1 is used to store the power supply of the VSYS network. When the battery is removed, the power supply of the VSYS network can be provided by the power stored in capacitor C1. It is recommended that the capacity of C1 be 220uF or higher, depending on the power consumption of the entire system and the required power supply time to the system.

[0046] MOSFET Q1 is used for power isolation between the VBAT and VSYS networks after the battery is removed. After the battery is removed, the voltage of the VBAT network drops, but the voltage of the VSYS network drops more slowly because of the charge stored in C1.

[0047] When the battery is removed, the voltage of the VBAT battery network will begin to decrease. When the VBAT network voltage drops to a certain value, the power supply to the gate (G) of MOSFET Q4 is insufficient to turn on MOSFET Q4, and the gate (G) and source (S) of MOSFET Q1 become equal in potential, causing MOSFET Q1 to turn off. At the same time, when the voltage difference between the emitter and base of transistor Q3 exceeds 0.5V (the voltage difference of transistor Q3 can be adjusted by the value of resistor R7), transistor Q3 will conduct, providing a high level to the gate (G) of MOSFET Q2, thus turning on MOSFET Q2. After MOSFET Q2 turns on, the residual voltage in the VBAT network will discharge rapidly through resistor R4 and MOSFET Q2.

[0048] When the voltage difference between the VBAT and VSYS networks reaches approximately 1V, MOSFET Q1 is turned off, and the power stored in C1 continues to supply power to the main control system. When the VBAT network power drops, the battery detection port of the main control chip 100 detects a rapid voltage drop. The main control chip 100 detects this rapid voltage drop and determines that the battery has been removed. The main control chip immediately initiates the software program protection process to ensure that the main control software immediately enters protection mode after the battery is removed, preventing abnormal software program loss due to sudden power failure.

[0049] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery disassembly detection circuit, characterized in that, include: Main control chip, removable battery, energy storage circuit, MOSFET circuit 1, MOSFET circuit 2, MOSFET circuit 3, voltage detection circuit, voltage divider and current limiting circuit; The positive terminal of the removable battery is electrically connected to the corresponding terminals of MOSFET circuit two, voltage divider and current limiting circuit, voltage detection circuit, and MOSFET circuit one, respectively. The NTC terminal of the removable battery is electrically connected to the NTC detection terminal of the main control chip, and the negative terminal of the removable battery is grounded. The corresponding terminal of MOSFET circuit two is also electrically connected to the corresponding terminal of the voltage detection circuit. The input terminal of the main control chip is also electrically connected to the corresponding terminals of the voltage detection circuit, MOSFET circuit one, and energy storage circuit, respectively. The battery detection terminal of the main control chip is also electrically connected to the corresponding terminal of the voltage divider and current limiting circuit. The corresponding terminal of MOSFET circuit three is also electrically connected to the corresponding terminals of the voltage divider and current limiting circuit and MOSFET circuit one, respectively.

2. The battery disassembly detection circuit according to claim 1, characterized in that, The main control chip is model CS8M323.

3. The battery disassembly detection circuit according to claim 2, characterized in that, The first MOSFET circuit includes a MOSFET Q1 and a resistor R1. The source of the MOSFET Q1 is electrically connected to the first terminal of the resistor R1, the corresponding terminal of the energy storage circuit, and the VBAT_IN pin of the main control chip. The drain of the MOSFET Q1 is electrically connected to the corresponding terminal of the voltage detection circuit, the corresponding terminal of the voltage divider and current limiting circuit, and the positive terminal of the removable battery. The gate of the MOSFET Q1 is electrically connected to the corresponding terminal of the third MOSFET circuit and the second terminal of the resistor R1.

4. The battery disassembly detection circuit according to claim 3, characterized in that, The energy storage circuit includes a capacitor C1, the first end of which is electrically connected to the source of the MOSFET Q1, and the second end of the capacitor C1 is grounded.

5. The battery disassembly detection circuit according to claim 4, characterized in that, The voltage detection circuit includes transistor Q3 and resistor R7; The first pin of transistor Q3 is electrically connected to the drain of MOSFET Q1 via resistor R7. The second pin of transistor Q3 is electrically connected to the VBAT_IN pin of the main control chip. The third pin of transistor Q3 is electrically connected to the corresponding terminal of MOSFET circuit two.

6. The battery disassembly detection circuit according to claim 5, characterized in that, The second MOSFET circuit includes a MOSFET Q2, a resistor R2, and a resistor R3. The drain of the MOSFET Q2 is electrically connected to the positive terminal of the removable battery via a resistor R4, the source of the MOSFET Q2 is grounded, and the gate of the MOSFET Q2 is electrically connected to the third pin of the transistor Q3 via a resistor R3.

7. The battery disassembly detection circuit according to claim 6, characterized in that, The MOSFET circuit includes MOSFET Q4; the drain of MOSFET Q4 is electrically connected to the gate of MOSFET Q1, the source of MOSFET Q4 is grounded, and the gate of MOSFET Q4 is electrically connected to the corresponding terminal of the voltage divider and current limiting circuit.

8. The battery disassembly detection circuit according to claim 7, characterized in that, The voltage divider and current limiting circuit includes resistors R2, R5, R6, R8, and capacitor C2. The first terminal of capacitor C2 is electrically connected to the positive terminal of the removable battery, the first terminal of resistor R5, the first terminal of resistor R2, and the drain of MOSFET Q1. The second terminal of capacitor C2 is grounded. The second terminal of resistor R5 is electrically connected to the battery detection terminal of the main control chip and the first terminal of resistor R6. The second terminal of resistor R6 is grounded. The second terminal of resistor R2 is electrically connected to the gate of MOSFET Q4 and the first terminal of resistor R8. The second terminal of resistor R8 is grounded.

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