CN214626426U

CN214626426U - Automatic dormancy protection control device of lithium cell group

Info

Publication number: CN214626426U
Application number: CN202120531503.7U
Authority: CN
Inventors: 方岳亮; 方彬; 徐锐
Original assignee: Hefei Tongzhi Electrical Control Technology Co ltd
Current assignee: Hefei Tongzhi Electrical Control Technology Co ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-11-05
Anticipated expiration: 2031-03-12

Abstract

The utility model provides an automatic dormancy protection controlling means of group battery, put comparison circuit and awakening circuit including voltage stabilizing circuit, fortune, the battery output voltage of lithium cell group passes through voltage stabilizing circuit gives the inside steady voltage power supply of battery management system, and reference voltage and battery output voltage put comparison circuit after the output go up electric wake-up signal SlefDown _ Ctrl through fortune, and awakening circuit realizes the switch-on and cuts off the external power supply of lithium cell group. The utility model has the advantages that: the utility model provides a controlling means under lithium cell group is in under-voltage protection back or insufficient voltage mode suitable for battery management system, if battery management system's lithium cell group is under insufficient voltage state, panel switch forgets the disconnection, leads to the lithium cell to be in degree of depth insufficient voltage and reachs 0V even, and still can continue to consume the energy of battery behind the group battery under-voltage protection, the utility model discloses protect control to it for cut off the external power supply of lithium cell group and entire system's supply circuit loss behind the group battery under-voltage protection, increased the protection mechanism of current Battery Management System (BMS).

Description

Automatic dormancy protection control device of lithium cell group

Technical Field

The utility model discloses a battery management field especially is about battery management system.

Background

In the technical field of Battery Management Systems (BMS), most of the Battery Management Systems (BMS) are mainly functional and include: monitoring physical parameters of the battery in real time; estimating the state of the battery; online diagnosis and early warning; charging, discharging and pre-charging control; balance management, thermal management, and the like. In the process of charging and discharging the battery, the terminal voltage and temperature, the charging and discharging current and the total voltage of the battery pack of each battery in the lithium battery pack are collected in real time, and the overcharge or overdischarge phenomenon of the battery is prevented.

On a military UPS power supply, the power supply comprises an AC/DC charging power supply, a DC/DC direct current power supply and a DC/AC inverter power supply; because the UPS power supply needs to realize uninterrupted power supply, the UPS power supply can charge the lithium battery pack through the AC/DC charging power supply under the condition that a mains supply/diesel generator exists, and the lithium battery pack can supply uninterrupted power to direct current or alternating current equipment under the condition that no mains supply/diesel generator exists.

When the UPS works, most of the UPS is unattended, a Battery Management System (BMS) is always in a working state, and a general battery management system only protects the battery from undervoltage and has no automatic sleep protection function; for unattended products, a UPS system power switch and a lithium battery pack switch are forgotten to be turned off after working, and the voltage shortage degree of an internal lithium battery pack is different along with different turn-on time of the UPS backup power switch, even the voltage of the internal lithium battery pack is 0V, so that the service life of the lithium battery pack is seriously influenced; some Battery Management Systems (BMS) also enter a low power mode, so-called low power mode, for a lithium battery pack with a power loss, which only extends the standby time of the lithium battery pack and cannot reach the zero power mode, and is also power consuming.

A battery management system sleep control circuit as disclosed in application No. 201620428481.0, comprising: a main power supply (U1), a sleep controller (U2), and a charging connection detection circuit; the input end of the main power supply (U1) is electrically connected with a vehicle-mounted power supply through a vehicle-mounted key, the dormant power supply (U2) is electrically connected with the vehicle-mounted power supply, the charging connection detection circuit is configured to be electrically connected with a charging gun to sense a charging signal and is configured to be electrically connected with the dormant power supply (U2) to obtain working voltage, the charging connection detection circuit is also connected with the main power supply (U1), and in the case of sensing the charging signal, the charging connection detection circuit outputs a wake-up signal to the main power supply (U1) to start the main power supply (U1). In this battery management system dormancy control circuit overcome prior art, BMS does not generally have dormancy circuit, even possess the dormancy circuit, BMS also often need awaken up through manual switch, uses extremely inconvenient problem.

The 201620428481.0 patent describes that when the sleep mode is entered, only the main power supply (U1) enters the sleep state, and the sleep power supply (U2) is still in the low power consumption operation mode, and does not really enter the system sleep mode, and as time goes on, the sleep power supply (U2) also consumes the power of the vehicle power supply, and does not implement the sleep zero power consumption mode. The' 201721755248.4 patent discloses a non-power consuming sleep battery system including a battery pack for storing electrical energy; a battery management part for managing the charging and discharging state of the battery pack; a communication port for transmitting control signals to control the working states of the battery pack and the battery management part; the communication port is electrically connected with the battery management part; a power transmission lead for transmitting electric energy and a signal lead for transmitting signals are arranged between the battery pack and the battery management part, and a semiconductor switch which is electrically connected with the communication port and is controlled by the communication port to work is arranged on the power transmission lead; and a transformer for regulating voltage is arranged on a lead connected between the conductor switch and the communication port. By adding the semiconductor switch between the battery and the power supply unit and adding the filter capacitor, the clock signal of the communication port is used as the starting drive of the semiconductor switch, only a communication line is connected with an external signal, the system wiring is less, the power supply system realizes the non-power-consumption dormancy when the battery pack is not used for a long time, and the electricity storage time of the battery pack in the system can be greatly prolonged.

The 201721755248.4 patent discloses a non-power consumption sleep battery system, wherein a Q1MOSFET tube in the patent has a body diode, when the MOSFET tube is not turned on, the internal body diode also forms a loop between the battery and the battery management unit, and there is a leakage current, so that zero power consumption cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that how to prevent that battery management system from forgetting the long problem of the back lithium cell group voltage insufficient time of shutting down.

The utility model discloses a following technical means realizes solving above-mentioned technical problem:

a battery pack automatic dormancy protection control device comprises a voltage stabilizing circuit, an operational amplifier comparison circuit and a wake-up circuit, wherein battery output voltage of a lithium battery pack supplies power to the internal voltage stabilization of a battery management system through the voltage stabilizing circuit, reference voltage and the battery output voltage output a power-on wake-up signal SlefDown _ Ctrl after passing through the operational amplifier comparison circuit, and the wake-up circuit is used for switching on and switching off external power supply of the lithium battery pack and power supply of a BMS;

the awakening circuit comprises an MOS tube U2, an optocoupler E1, a relay K1 and a lithium battery pack front panel self-locking button switch, wherein the lithium battery pack front panel self-locking button switch is pressed down and attracted, 5 pins and 6 pins of the relay K1 are connected with a battery input power supply end, when the relay K1 is closed, the output ends of the 7 pin and the 8 pin of the relay K1 are used as the output power supply ends of the battery, meanwhile, a system voltage stabilizing circuit and the operational amplifier comparison circuit are connected, a pin 2 (IN) of an MOS tube U2 is connected to the output end of an optical coupler E1, a pin 3 of an MOS tube U2 is connected with SW Wake Up-battery voltage, a pin 4 of an MOS tube U2) is grounded through a resistor R9, a pin 5 of an MOS tube U2 is grounded through a resistor R8, a pin 1 and a pin 5 of an MOS tube U2 are connected to a port 1 of a relay K1 after being connected, a signal input end of the optical coupler E1 is connected with the output end of the operational amplifier comparison circuit, and a power-on Wake-Up signal SlefDown _ Ctrl output by the operational amplifier comparison circuit is input.

The utility model discloses a dormancy protection control circuit to adopt the relay to carry out physics with lithium cell group and BMS management system and external circuit and keep apart, really realized the zero-power consumption under the lithium cell group sleep mode.

As a further specific technical scheme, pin 1 of the optical coupler E1 is connected to the output end of a voltage stabilizing circuit through a resistor R6, pin 2 of the optical coupler E1 is connected to the output end of the operational amplifier comparison circuit, pin 2 of the optical coupler E1 is grounded through a capacitor C12, pin 3 of the optical coupler E1 is grounded, and pin 4 of the optical coupler E1 is connected to pin 2 of the MOS transistor U2 through a resistor R7.

As a more specific technical solution, the 4 pins of the optical coupler E14 are connected to one ends of the capacitors C10 and C11 connected in parallel, and the other ends of the capacitors C10 and C11 connected in parallel are grounded.

As a more specific technical solution, the diode V5 is connected in parallel at two ends of the relay K1.

As a further specific technical solution, the voltage stabilizing circuit includes a voltage stabilizing block U1, capacitors C1, C4, diodes V1 and V2, and an inductor L1, wherein an anode of the diode V1 is connected to the battery output terminal, a cathode is connected to one end of the capacitors C1 and C4 in parallel and a port 1 of the voltage stabilizing block U1, the other end of the capacitors C1 and C4 in parallel is grounded,

ports

3 and 5 of the voltage stabilizing block U1 are grounded, a port 2 of the voltage stabilizing block U1 is connected to one end of the inductor L1 and a cathode of the diode V2, an anode of the diode V2 is grounded, and a port 4 of the voltage stabilizing block U1 is connected to the other end of the inductor L1 as a dc voltage output terminal.

As a more specific technical solution, the other end of the inductor L1 is simultaneously connected to one end of the capacitors C5, C2, C3 and C6 connected in parallel, the connection point is used as a dc voltage output end, and the other ends of the capacitors C5, C2, C3 and C6 connected in parallel are grounded.

As a further specific technical solution, the operational amplifier comparison circuit includes an operational amplifier N1A, resistors R1 to R3, a capacitor C8, diodes V3 and V4, one end of the resistor R1 is connected to the output end of the voltage regulator circuit, the other end is connected to the cathode of the controllable precision voltage regulator V4 and one end of the resistor R2, the anode of a controllable precise voltage-stabilizing source V4 is grounded, a capacitor C8 is connected in parallel with two ends of a controllable precise voltage-stabilizing source V4, the other end of a resistor R2 is connected with the reverse input end of an operational amplifier N1A, the output end of a battery is connected with the forward input end of the operational amplifier N1A, the reference voltage end of the operational amplifier N1A is connected with the output end of a voltage-stabilizing circuit, the output end of the operational amplifier N1A is grounded through a resistor R3 and a capacitor C9 which are connected in series, the anode of a diode V3 is connected between the resistor R3 and the capacitor C9, and the cathode of the diode V3 is used as the output end of an operational amplifier comparison circuit to output a power-on wake-up signal SlefDown _ Ctrl.

As a more specific technical solution, the operational amplifier comparison circuit further includes resistors R4 and R5, the battery output terminal is grounded through the resistors R4 and R5 connected in series, and the positive input terminal connected to the operational amplifier N1A is connected between the resistors R4 and R5.

As a further specific technical scheme, a 2.5V voltage-stabilizing source output is formed by the resistor R1 and the controllable precise voltage-stabilizing source V4 and serves as a reference power supply of the operational amplifier N1A.

As a further specific technical scheme, the working process of the automatic sleep protection control device for the battery pack is as follows: after the button switch K1 of the battery panel is sucked, firstly, after voltage is accessed through a pin 3 of the MOS tube U2, after an internal circuit of the MOS tube U2 works, a pin 2 of the MOS tube U2 is pulled low, at the moment, a pin 1 and a pin 5 OUT of the MOS tube U2 output high levels, and the direct-current relay K1 is sucked; the battery input is switched on through a relay K1 and then supplies power to a voltage stabilizing block U1, direct current of +5V is output, power is supplied to an operational amplifier comparison circuit and a wake-up circuit, the battery output is sent to the operational amplifier comparison circuit, if the battery pack outputs in a loaded mode, the output voltage is reduced all the time until an operational amplifier comparison circuit outputs a power-on wake-up signal SlefDown _ Ctrl which is turned from a low level to a high level, the signal input end of an optical coupler E1 is at the high level at the moment, the output end of the optical coupler E1 and a pin 2 of an MOS tube U2 are at the low level, a pin 2 of the MOS tube U2 is at a high level, the OUT outputs of a pin 1 and a pin 5 of the MOS tube U2 are at the low level, and the direct current relay K1 is switched off; the external power supply of the lithium battery pack and the power supply circuit loss of the whole system are cut off.

The utility model has the advantages that: the utility model provides a controlling means under lithium cell group suitable for battery management system is in behind the undervoltage protection or insufficient voltage mode, if battery management system's group battery under insufficient voltage state, panel switch forgets the disconnection, leads to the battery to be in degree of depth insufficient voltage and reachs 0V even, and still can continue consuming battery's energy behind the group battery undervoltage protection, the utility model discloses protect control to it for cut off the external power supply of lithium cell group and entire system's supply circuit loss behind the group battery undervoltage protection, increased the protection mechanism of current Battery Management System (BMS).

Compared with the patent application of 201620428481.0 sleep control circuit of a battery management system, the automatic sleep protection control device of the lithium battery pack realizes zero power consumption of all power supplies in a battery pack sleep mode; for 201721755248.4 a no power consumption dormancy battery system patent application, mainly adopt the relay with lithium cell group and BMS management system and external circuit carry out physical isolation, really realized the zero-power consumption under the lithium cell group sleep mode.

Drawings

Fig. 1 is a circuit diagram of a voltage stabilizing circuit according to the present invention;

fig. 2 is a circuit diagram of the operational amplifier comparison circuit of the present invention;

fig. 3 is a circuit diagram of the wake-up circuit of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model discloses automatic dormancy protection controlling means of lithium cell group is applicable to battery management system, including voltage stabilizing circuit, fortune comparison circuit, wake-up circuit, MOS pipe switch circuit, relay physics buffer circuit. Referring to FIG. 1, the voltage regulator circuit includes a voltage regulator block U1: LM2576HVS-5.0V, capacitors C1 to C6, diodes V1 and V2, and an inductor L1, wherein the anode of the diode V1 is connected to the battery output terminal, the cathode is connected to one end of the parallel connection of the capacitors C1 and C4 and the port 1(Vin) of the voltage regulator block U1, the other end of the parallel connection of the capacitors C1 and C4 is grounded, the ports 3(GND) and 5(ON/OFF) of the voltage regulator block U1 are grounded, the port 2(Vo) of the voltage regulator block U1 is connected to one end of the inductor L1 and the cathode of the diode V2, the anode of the diode V2 is grounded, the port 4(FB) of the voltage regulator block U1 is connected to the other end of the inductor L1, and the other end of the inductor L1 is connected to one end of the parallel connection of the capacitors C5, C2, C3, C6, and the connection point serves as a dc voltage output terminal, and the other ends of the parallel connection of the capacitors C5, C2, C3, C6 are grounded.

The working principle of the voltage stabilizing circuit is as follows:

the positive output end of a lithium battery pack on the UPS system passes through a self-locking button switch of a front panel of the lithium battery pack, passes through a filter circuit consisting of a reverse connection prevention diode V1 and then a capacitor C1 and a capacitor C4; after the voltage of the lithium battery pack is connected to a voltage stabilizing block U1, the voltage is stabilized by the voltage stabilizing block U1 and an inductor L1 to output DC5V voltage, and then filtered by capacitors C2, C3, C5 and C6 which are connected in parallel to output +5V stable direct current voltage.

Referring to fig. 2, the operational amplifier comparison circuit includes an operational amplifier N1A, resistors R1 to R5, a capacitor C8, a diode V3 and a controllable precise voltage regulator V4, one end of the resistor R1 is connected to +5V, the other end is connected to the cathode of the controllable precise voltage regulator V4 and one end of the resistor R2, the anode of the controllable precise voltage regulator V4 is grounded, a capacitor C8 is connected in parallel to both ends of the controllable precise voltage regulator V4, the other end of the resistor R2 is connected to the reverse input end of the operational amplifier N1A, the output end of the battery is grounded through resistors R4 and R5 connected in series, the forward input end connected to the operational amplifier N1A is connected between the resistors R4 and R5, the reference voltage of the operational amplifier N1 5 is connected to +5V, the output end of the operational amplifier N1 5 is grounded through the resistor R5 and the capacitor C5 connected in series, the anode of the diode V5 is connected between the resistor R5 and the output end of the operational amplifier V5, and outputting a power-on wake-up signal SlefDown _ Ctrl. An alternative model for operational amplifier N1A is OPA 2365.

The operational principle of the operational amplifier comparison circuit is as follows:

the 2.5V voltage-stabilizing source output consisting of the resistor R1 and the controllable precise voltage-stabilizing source V4 is used as a reference power supply, the lithium battery pack battery output is subjected to voltage division through the resistors R4 and R5 which are connected in series, then the high and low levels are output through the operational amplifier N1A, the high and low levels are output through the resistor R3, interference signals are filtered out through the capacitor C9, and a power-on wake-up signal SlefDown _ Ctrl is output through the diode V3.

Referring to fig. 3, the Wake-Up circuit includes a MOS transistor U2, an optical coupler E1, capacitors C10 to C12, resistors R6 to R9, a relay K1, and a battery panel button switch K1, wherein a pin 1 of the optical coupler E1 is connected to +5V through a resistor R6, a pin 2 of the optical coupler E1 is connected to an output terminal of the operational amplifier comparison circuit, that is, a power-Up Wake-Up signal SlefDown _ Ctrl output by the operational amplifier comparison circuit is input to a pin 2 of the optical coupler E1, the pin 2 of the optical coupler E1 is grounded through a capacitor C12, a pin 3 of the optical coupler E1 is grounded, a pin 4 of the optical coupler E1 is connected to one end of the capacitors C10 and C11 connected IN parallel and one end of a resistor R7, the other ends of the capacitors C10 and C11 connected IN parallel are grounded, the other end of the resistor R7 is connected to a pin 2 (IN) of the MOS transistor U2, and a power supply voltage is given to a pin 3V of the MOS transistor U2 through a front panel self-locking button Switch (SW)_bb) The pin 4 (IS) of the MOS tube U2 IS grounded through a resistor R9, the pin 5 (OUT) of the MOS tube U2 IS grounded through a resistor R8, and the pin 1 (OUT) and the pin 5 (OUT) of the MOS tube U2 are connected and then connected to a relay. An optional model of the optical coupler E1 is TL281, and an optional model of the MOS tube U2 is BTS 6163D.

The working principle of the wake-up circuit is as follows:

the power supply is characterized in that a 3-pin (SW Wake Up _ battery voltage) input to an MOS tube U2 after a button switch of a front panel self-locking panel is switched on is adopted, the interior of the MOS tube U2 outputs to a 2-pin through current limiting to charge two ends of capacitors C10 and C11, when the 2-pin of the MOS tube U2 is pulled down, the 2-pin of an optical coupler E1 is pulled down, the 1-pin of the MOS tube U2 and OUT of the 5-pin output high level, and a relay K1 is switched on. As can be understood from the above description, the battery output in fig. 1, 2, and 3 refers to the voltage after passing through the K1 relay after the battery input, and the battery input in fig. 3 refers to the input of the voltage of the lithium battery pack itself after passing through the front panel latching button switch.

Referring to fig. 1 and 2 again, after the front panel self-locking panel button switch of the lithium battery pack is attracted, firstly, after the power signal SW Wake Up-battery voltage is given by the front panel self-locking button switch through 3 pins of the MOS tube U2, after the internal circuit of the MOS tube U2 works, 2 pins of the MOS tube U2 are pulled to be low level, at the moment, OUT of 1 pin and 5 pin of the MOS tube U2 outputs high level, and the relay K1 is attracted; the battery input is switched on through a relay and then supplies power to a voltage stabilizing block U1, direct current of +5V is output, power is supplied to an operational amplifier N1A and is used as reference voltage of the operational amplifier N1A, power is supplied to an optical coupler E1, when the battery output is divided by resistors R4 and R5 and then is sent to a pin 3 of the operational amplifier N1A, and the dormant voltage point of the lithium battery pack can be changed by adjusting the resistance values of the resistors R4 and R5; if the output of the lithium battery pack is always in the on-load mode, the output voltage is always reduced until the voltage of the pin 3 of the operational amplifier N1A is lower than 2.5V, then the pin 1 of the operational amplifier N1A is inverted from low level to high level, the pin 2 of the optical coupler E1 is at the high level at the moment, the pin 4 of the optical coupler E1 and the pin 2 of the MOS tube U2 are at low level, the pin 2 of the MOS tube U2 is at high resistance state, the OUT outputs of the pin 1 and the pin 5 of the MOS tube U2 are at low level, and the relay K1 is disconnected; the external power supply of the lithium battery pack and the loss of the power supply circuit of the whole system are physically cut off.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a group battery automatic sleep protects controlling means which characterized in that: the battery management system comprises a voltage stabilizing circuit, an operational amplifier comparison circuit and a wake-up circuit, wherein battery output voltage of a lithium battery pack supplies power to the internal voltage stabilization of the battery management system through the voltage stabilizing circuit, a reference voltage and the battery output voltage output a power-on wake-up signal SlefDown _ Ctrl after passing through the operational amplifier comparison circuit, and the wake-up circuit is used for switching on and switching off external power supply of the lithium battery pack and power supply of the BMS;

2. The battery pack auto-sleep protection control device of claim 1, wherein: a pin 1 of the optical coupler E1 is connected with the output end of a voltage stabilizing circuit through a resistor R6, a pin 2 of the optical coupler E1 is connected with the output end of the operational amplifier comparison circuit, a pin 2 of the optical coupler E1 is grounded through a capacitor C12, a pin 3 of the optical coupler E1 is grounded, and a pin 4 of the optical coupler E1 is connected with a pin 2 of an MOS tube U2 through a resistor R7.

3. The battery pack auto-sleep protection control device of claim 2, wherein: and the 4 pins of the optical coupler E14 are connected to one ends of capacitors C10 and C11 which are connected in parallel, and the other ends of the capacitors C10 and C11 which are connected in parallel are grounded.

4. The battery pack auto-sleep protection control device of claim 1, wherein: the diode V5 is connected in parallel across the relay K1.

5. The battery pack auto-sleep protection control device of claim 1, wherein: the voltage stabilizing circuit comprises a voltage stabilizing block U1, capacitors C1, C4, diodes V1, V2 and an inductor L1, wherein the anode of the diode V1 is connected with the output end of a battery, the cathode of the diode V3583 is connected with one end of the capacitors C1 and C4 which are connected in parallel and a port 1 of the voltage stabilizing block U1, the other end of the capacitors C1 and C4 which are connected in parallel is grounded, ports 3 and 5 of the voltage stabilizing block U1 are grounded, a port 2 of the voltage stabilizing block U1 is connected with one end of the inductor L1 and the cathode of the diode V2, the anode of the diode V2 is grounded, and a port 4 of the voltage stabilizing block U1 is connected with the other end of the inductor L1 and serves as a direct-current voltage output end.

6. The battery pack auto-sleep protection control device of claim 5, wherein: the other end of the inductor L1 is simultaneously connected to one end of the capacitors C5, C2, C3 and C6 which are connected in parallel, the connection point is used as a direct-current voltage output end, and the other ends of the capacitors C5, C2, C3 and C6 which are connected in parallel are grounded.

7. The battery pack auto-sleep protection control device of claim 1, wherein: the operational amplifier comparison circuit comprises an operational amplifier N1A, resistors R1-R3, a capacitor C8, diodes V3 and V4, wherein one end of the resistor R1 is connected with the output end of a voltage stabilizing circuit, the other end of the resistor R1 is connected with the cathode of a controllable precise voltage stabilizing source V4 and one end of the resistor R2, the anode of the controllable precise voltage stabilizing source V4 is grounded, the capacitor C8 is connected with the two ends of the controllable precise voltage stabilizing source V4 in parallel, the other end of the resistor R2 is connected with the reverse input end of the operational amplifier N1A, the output end of a battery is connected with the forward input end of the operational amplifier N1A, the reference voltage end of the operational amplifier N1A is connected with the output end of the voltage stabilizing circuit, the output end of the operational amplifier N1A is grounded through the resistor R3 and the capacitor C9 which are connected in series, the anode of a diode V3 is connected between the resistor R3 and the capacitor C9, and the cathode of the diode V3 is used as the output end of the operational amplifier comparison circuit, and outputs an electrifying wake-up signal Down _ Cref.

8. The battery pack auto-sleep protection control device of claim 7, wherein: the operational amplifier comparison circuit further comprises resistors R4 and R5, the output end of the battery is grounded through the resistors R4 and R5 which are connected in series, and the positive input end of the operational amplifier N1A is connected between the resistors R4 and R5.

9. The battery pack auto-sleep protection control device of claim 7, wherein: the resistor R1 and the controllable precise voltage-stabilizing source V4 form a 2.5V voltage-stabilizing source output as a reference power supply of the operational amplifier N1A.