Lithium battery protection board control circuit

Abstract

The utility model relates to the field of batteries, and discloses a lithium battery protection board control circuit, which comprises a battery charging module used for detecting battery voltage and constructing a charging loop for a battery module when the battery voltage is lower than a first voltage threshold value; the battery module is used for a battery to store electric energy and output voltage; the battery discharging module is used for controlling the battery module to discharge through a single key; the detection disconnection module is used for detecting the battery voltage and sending a voltage signal to the battery discharging module when the battery voltage is lower than a second threshold value, the battery discharging module is disconnected, and the battery module stops discharging; compared with the prior art, the beneficial effects of the utility model are that through the battery charging module, the condition of the battery is checked firstly after the power supply is input, and when the electric quantity of the battery is sufficient, a battery charging loop is not constructed, so that the plug is prevented from being plugged for charging; a battery discharging module is arranged, discharging is controlled through a single key, and power is automatically cut off when the battery is insufficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, specifically a lithium battery protection board control circuit. BACKGROUND

[0002] The lithium battery protection board, as the name implies, is an integrated circuit board for protecting lithium batteries (generally rechargeable). Due to the material properties of lithium batteries, they cannot be overcharged, over-discharged, overcurrent, short-circuited, and over-temperature charged and discharged. The main functions of the lithium battery protection board include overcharge protection, over-discharge protection, overcurrent and short-circuit protection, and temperature protection, etc. to ensure the safety and stable operation of the battery.

[0003] The existing battery charging protection is detected only during charging, which cannot be detected before charging and needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a lithium battery protection board control circuit to solve the problem in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A lithium battery protection board control circuit, comprising:

[0007] A battery charging module for detecting battery voltage, and constructing a charging loop for the battery module when the battery voltage is lower than a first voltage threshold;

[0008] A battery module for storing electrical energy and outputting voltage;

[0009] A battery discharging module for discharging the battery module through a single button;

[0010] A detection disconnecting module for detecting battery voltage, and sending a voltage signal to the battery discharging module when the battery voltage is lower than a second threshold, so that the battery discharging module is disconnected and the battery module stops discharging;

[0011] The battery charging module is connected to the battery module, the battery module is connected to the battery discharging module, and the battery discharging module is connected to the detection disconnecting module.

[0012] As a further solution of the present invention: the battery charging module includes a resistor R1, a diode D1, a resistor R2, a MOS transistor V1, a diode D2, a resistor R3, a resistor R4, and a transistor V2, one end of the resistor R1 is connected to the positive electrode of the diode D1 and the power supply voltage VCC, the negative electrode of the diode D1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the D electrode of the MOS transistor V1, the G electrode of the MOS transistor V1 is connected to one end of the resistor R4, the S electrode of the MOS transistor V1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the battery module and one end of the resistor R3, the other end of the resistor R3 is connected to the base of the transistor V2, the emitter of the transistor V2 is connected to the other end of the resistor R1 and grounded, and the collector of the transistor V2 is connected to the other end of the resistor R4.

[0013] As a further solution of the present invention: the battery module includes a battery E1, the positive electrode of the battery E1 is connected to the battery charging module and the battery discharging module, and the negative electrode of the battery E1 is grounded.

[0014] As a further solution of the present invention: the battery discharge module includes a button S1, a resistor R5, a resistor R6, a transistor V3, a transistor V4, and a capacitor C1. One end of the button S1 is connected to the battery module, one end of the resistor R5, and the emitter of the transistor V4. The other end of the button S1 is connected to the base of the transistor V3, one end of the resistor R6, and the detection disconnection module. The emitter of the transistor V3 is grounded, the collector of the transistor V3 is connected to the other end of the resistor R5 and the base of the transistor V4, the collector of the transistor V4 is connected to the other end of the resistor R6 and one end of the capacitor C1, and the other end of the capacitor C1 is grounded.

[0015] As a further solution of the present utility model: the detection disconnection module includes a resistor R7, a resistor R8, a resistor R9, a resistor R10, a diode D3, an amplifier U1, and a MOS tube V5. One end of the resistor R7 is connected to one end of the resistor R8 and the collector of the transistor V4, the other end of the resistor R7 is connected to the cathode of the diode D3 and the non-inverting terminal of the amplifier U1, the anode of the diode D3 is grounded, the other end of the resistor R8 is connected to one end of the resistor R9 and the inverting terminal of the amplifier U1, the other end of the resistor R9 is grounded, the output end of the amplifier U1 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the G pole of the MOS tube V5, the S pole of the MOS tube V5 is grounded, and the D pole of the MOS tube V5 is connected to the base of the transistor V3.

[0016] The battery charging module adopted by the present invention will first check the battery condition after the power is input. When the battery power is sufficient, the battery charging circuit will not be built to avoid charging as soon as the plug is plugged in; a battery discharging module is set to control the discharge through a single button, and the power will be automatically cut off when the battery power is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a lithium battery protection plate control circuit.

[0018] Figure 2 It is a circuit diagram of a battery charging module and a battery module.

[0019] Figure 3 It is a circuit diagram of a battery module, a battery discharging module and a detection disconnecting module. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figure 1 The utility model provides a kind of lithium battery protection plate control circuit, and the lithium battery protection plate control circuit includes:

[0022] Battery charging module is used to detect battery voltage, and when battery voltage is lower than first voltage threshold, it constructs charging loop for battery module;

[0023] Battery module is used to store electric energy in battery, and output voltage;

[0024] Battery discharging module is used to discharge battery module by single button control;

[0025] Detection disconnecting module is used to detect battery voltage, and when battery voltage is lower than second threshold, voltage signal is sent to battery discharging module, battery discharging module is disconnected, and battery module stops discharging;

[0026] Battery charging module connects battery module, battery module connects battery discharging module, and battery discharging module connects detection disconnecting module.

[0027] In the embodiment: please refer to Figure 2, the battery charging module includes resistance R1, diode D1, resistance R2, MOS tube V1, diode D2, resistance R3, resistance R4, triode V2, one end of resistance R1 is connected with the positive pole of diode D1, supply voltage VCC, the negative pole of diode D1 is connected with one end of resistance R2, the other end of resistance R2 is connected with the D pole of MOS tube V1, the G pole of MOS tube V1 is connected with one end of resistance R4, the S pole of MOS tube V1 is connected with the positive pole of diode D2, the negative pole of diode D2 is connected with the battery module and one end of resistance R3, the other end of resistance R3 is connected with the base of triode V2, the emitter of triode V2 is connected with the other end of resistance R1 and ground, the collector of triode V2 is connected with the other end of resistance R4.

[0028] After the supply voltage VCC is input, if the voltage of battery E1 is large enough at this time, the base of triode V2 (PNP triode) is high level, triode V2 is cut off, MOS tube V1 is cut off, and battery E1 does not charge; when the voltage of battery E1 is small, the base of triode V2 is low level, triode V2 is turned on, MOS tube V1 is turned on, and battery E1 charges.

[0029] In the embodiment, please refer to Figure 2 or Figure 3 , the battery module includes battery E1, the positive pole of battery E1 is connected with the battery charging module and the battery discharging module, and the negative pole of battery E1 is grounded.

[0030] Battery E1 stores electric energy when charging and outputs voltage to supply power for the device when discharging.

[0031] In the embodiment, please refer to Figure 3 , the battery discharging module includes key S1, resistance R5, resistance R6, triode V3, triode V4, and capacitor C1, one end of key S1 is connected with the battery module, one end of resistance R5, the emitter of triode V4, the other end of key S1 is connected with the base of triode V3, one end of resistance R6, and the detection disconnecting module, the emitter of triode V3 is grounded, the collector of triode V3 is connected with the other end of resistance R5 and the base of triode V4, the collector of triode V4 is connected with the other end of resistance R6 and one end of capacitor C1, and the other end of capacitor C1 is grounded.

[0032] When battery E1 needs to discharge, it is only needed to press key S1 (which will pop up after being pressed), at this time, the base of triode V3 (NPN triode) is high level, triode V3 is turned on, the base voltage of triode V4 (PNP triode) is pulled down, triode V4 is turned on, and the voltage of battery E1 is outputted through voltage VOUT to supply power for the device; at the same time, the voltage outputted by triode V4 maintains the conduction of triode V3 through resistance R6, and the power supply is still maintained after key S1 is popped up.

[0033] In the embodiment, refer to Figure 3 The detection disconnecting module comprises resistor R7, resistor R8, resistor R9, resistor R10, diode D3, amplifier U1, MOS tube V5, one end of resistor R7 is connected with one end of resistor R8 and the collector of triode V4, the other end of resistor R7 is connected with the negative electrode of diode D3 and the non-inverting terminal of amplifier U1, the positive electrode of diode D3 is grounded, the other end of resistor R8 is connected with one end of resistor R9 and the inverting terminal of amplifier U1, the other end of resistor R9 is grounded, one end of resistor R10 is connected with the output terminal of amplifier U1, the other end of resistor R10 is connected with the G pole of MOS tube V5, the S pole of MOS tube V5 is grounded, and the D pole of MOS tube V5 is connected with the base of triode V3.

[0034] The voltage on resistor R8 and resistor R9 is the size of output voltage VOUT, and the voltage on resistor R9 can reflect the voltage of the current battery E1, when the voltage of battery E1 is insufficient, the voltage on resistor R9 will be smaller than the fixed voltage on voltage stabilizing diode D3, so that the output terminal of amplifier U1 outputs high level, MOS tube V5 is turned on, the base voltage of triode V3 is pulled down, triode V3 is cut off, triode V4 is cut off, and the battery discharging module stops discharging.

[0035] The working principle of the utility model is: the battery charging module is used for detecting battery voltage, and a charging circuit is constructed for the battery module when the battery voltage is lower than the first voltage threshold; the battery module is used for storing battery power and outputting voltage; the battery discharging module is used for discharging the battery module through single-key control; the detection disconnecting module is used for detecting battery voltage, and sends a voltage signal to the battery discharging module when the battery voltage is lower than the second threshold, so that the battery discharging module is disconnected and the battery module stops discharging.

[0036] It is apparent for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view.

[0037] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A lithium battery protection board control circuit, characterized in that, The application relates to a battery charging module, a battery module, a battery discharging module and a detection disconnecting module. The battery charging module comprises a resistor R1, a diode D1, a resistor R2, a MOS tube V1, a diode D2, a resistor R3, a resistor R4 and a triode V2, one end of the resistor R1 is connected with the positive electrode of the diode D1 and a power supply voltage VCC, the negative electrode of the diode D1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the D electrode of the MOS tube V1, the G electrode of the MOS tube V1 is connected with one end of the resistor R4, the S electrode of the MOS tube V1 is connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with the battery module and one end of the resistor R3, the other end of the resistor R3 is connected with the base electrode of the triode V2, the emitter electrode of the triode V2 is connected with the other end of the resistor R1 and the ground, and the collector electrode of the triode V2 is connected with the other end of the resistor R4. The battery module comprises a battery E1, the positive electrode of the battery E1 is connected with the battery charging module and the battery discharging module, and the negative electrode of the battery E1 is grounded. The battery discharging module comprises a key S1, a resistor R5, a resistor R6, a triode V3, a triode V4 and a capacitor C1, one end of the key S1 is connected with the battery module, one end of the resistor R5 and the emitter electrode of the triode V4, the other end of the key S1 is connected with the base electrode of the triode V3, one end of the resistor R6 and the detection disconnecting module, the emitter electrode of the triode V3 is grounded, the collector electrode of the triode V3 is connected with the other end of the resistor R5, the base electrode of the triode V4, the other end of the resistor R6 and one end of the capacitor C1, and the other end of the capacitor C1 is grounded. The detection disconnecting module comprises a resistor R7, a resistor R8, a resistor R9, a resistor R10, a diode D3, an amplifier U1 and a MOS tube V5, one end of the resistor R7 is connected with one end of the resistor R8 and the collector electrode of the triode V4, the other end of the resistor R7 is connected with the negative electrode of the diode D3 and the non-inverting terminal of the amplifier U1, the positive electrode of the diode D3 is grounded, the other end of the resistor R8 is connected with one end of the resistor R9 and the inverting terminal of the amplifier U1, the other end of the resistor R9 is grounded, one end of the resistor R10 is connected with the output terminal of the amplifier U1, the other end of the resistor R10 is connected with the G electrode of the MOS tube V5, the S electrode of the MOS tube V5 is grounded, and the D electrode of the MOS tube V5 is connected with the base electrode of the triode V3. ​ 2. The lithium battery protection board control circuit of claim 1, wherein, ​ 3. The lithium battery protection board control circuit of claim 1, wherein, ​ 4. The lithium battery protection board control circuit of claim 1, wherein, ​ 5. The lithium battery protection board control circuit of claim 4, wherein, ​

Images