CN214755680U

CN214755680U - Battery control circuit

Info

Publication number: CN214755680U
Application number: CN202121388407.8U
Authority: CN
Inventors: 傅依勇; 张树喜; 付依政
Original assignee: Shenzhen Sp Microelectronics Co ltd
Current assignee: Shenzhen Sp Microelectronics Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-11-16
Anticipated expiration: 2031-06-22

Abstract

The utility model provides a battery control circuit, it includes integrated IC unit, still includes induction module, first electrolytic capacitor, inductance, first current-limiting resistor, charge indicator, load, battery. The integrated IC unit comprises a control module, a charging MOS module and a protection MOS module; the control module is used for controlling the conduction of an MOS (metal oxide semiconductor) tube of the charging MOS module when the voltage of the battery is lower than a third charging voltage, so that the power supply charges the battery through a VDD (voltage-VDD) pin; and the MOS tube of the charging MOS module is controlled to be disconnected when the battery voltage is higher than the first charging voltage. The utility model discloses a battery control circuit is a multi-functional single section lithium cell integrated circuit device, has realized the charge management and the protection management of lithium cell, has simplified circuit design effectively, has reduced the preparation cost, has realized the compatible of circuit multiple functions and the promotion of performance, convenient to use, and the security is high, has wide market perspective.

Description

Battery control circuit

Technical Field

The utility model relates to a battery charge-discharge technical field, concretely relates to battery control circuit.

Background

In the prior art, in electronic products using lithium ion batteries, lithium polymer batteries, etc. as rechargeable batteries, lithium ions are easily damaged due to the unstable characteristics thereof, such as overvoltage, overcurrent, overcharge, overdischarge, etc., the service life of the battery cell is greatly shortened, and the battery has explosion risks. In order to control the voltage and the current in the charging process and avoid the risks, a technician needs to design a complex control circuit, so that the volume and the preparation cost of the product are greatly increased. In order to ensure that the product has a suitable volume, only a part of the circuit protection function is reserved and most of the protection function is abandoned, so that the imperfect design causes risks such as explosion or fire when the battery is used in practical application. In the prior art, the application market of a single lithium battery is wider and wider, the lithium batteries are various, and products are required to have more and more complex functions, but the lithium batteries cannot be effectively charged and discharged in the design of adopting the lithium batteries as charging and discharging batteries, the circuit design is also more and more complex, and a series of problems of high cost, easiness in failure, difficulty in maintenance and the like are further caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery control circuit, which comprises an integrated IC unit, wherein the integrated IC unit comprises a control module, a charging MOS module and a protection MOS module; the control module is connected to the charging MOS module and the protection MOS module; the charging MOS module/the protection MOS module comprises an MOS tube; a VDD pin and a BP pin are led out from the charging MOS module; a BN pin and a GND pin are led out from the protection MOS module; the VDD pin is used for being connected to a power supply, the BP pin and the BN pin are used for being connected with a battery, and the GND pin is grounded; the control module is used for controlling the conduction of an MOS (metal oxide semiconductor) tube of the charging MOS module when the voltage of the battery is lower than a third charging voltage, so that the power supply charges the battery through a VDD (voltage-VDD) pin; controlling the MOS tube of the charging MOS module to be disconnected when the battery voltage is higher than a first charging voltage; wherein the first charging voltage is higher than the third charging voltage; the control module is also used for controlling the conduction of an MOS tube of the protection MOS module when the battery voltage is higher than the first discharge voltage so as to discharge the battery outwards; the MOS tube of the control protection MOS module is disconnected when the battery voltage is lower than a second discharge voltage; wherein the first discharge voltage is higher than the second discharge voltage.

The utility model discloses a battery control circuit is a multi-functional single section lithium cell integrated circuit device, has realized the charge management and the protection management of lithium cell, has simplified circuit design effectively, has reduced the preparation cost, has realized the compatible of circuit multiple functions and the promotion of performance, convenient to use, and the security is high, has wide market perspective.

Drawings

Fig. 1 is a schematic structural diagram of a multifunctional lithium battery integrated control circuit according to a first embodiment;

FIG. 2 is a schematic diagram of an integrated IC unit according to the first embodiment;

fig. 3 is a flow chart of the operating principle of the integrated control circuit of the multifunctional lithium battery according to the first embodiment.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous specific details are set forth in order to provide a better understanding of the present invention. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some cases, operations related to the present invention are not shown or described in the specification, so as to avoid the core part of the present invention being overwhelmed by excessive description, and it is not necessary for those skilled in the art to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connect" or "connect" as used herein includes both direct and indirect connections (connections), unless otherwise specified.

The first embodiment is as follows:

fig. 1 shows an integrated control circuit for a multi-functional lithium battery of this embodiment, which includes an integrated IC unit 10 shown in fig. 2, and further includes an induction module 40, a first electrolytic capacitor 81, an inductor 70, a first current limiting resistor 91, a charging indicator lamp 60, a load 50, a lithium battery 30, a second capacitor 82, and a third resistor 93. The integrated IC unit 10 includes a control module 11, a charging MOS module 12, a protection MOS module 13, a boosting MOS module 14, a detection module 15, and an output MOS module 16, and further includes a first comparator U1, a second comparator U2, a third comparator U3, a fourth comparator U4, a fifth comparator U5, a sixth comparator U6, a seventh comparator U7, an eighth comparator U8, a ninth comparator U9, a tenth comparator U10, an eleventh comparator U11, and a twelfth comparator U12. In this embodiment, the sensing module 40, the load 50 and the lithium battery 30 are components of a lithium battery control circuit, and in other embodiments, the sensing module 40, the load 50 and the lithium battery 30 may not belong to the lithium battery control circuit, but may be an independent electronic device or product that is inserted into the lithium battery control circuit. The control module 11 may be an integrated circuit of SP1697 type or the like.

The third terminal of the charging MOS module 12, the third terminal of the protection MOS module 13, the third terminal of the boosting MOS module 14, and the third terminal of the detection module 15 are connected to the control module 11. Metal-Oxide-Semiconductor Field Effect transistors (MOSFET, MOS Transistor) are disposed in the charging MOS module 12, the protection MOS module 13, the boosting MOS module 14, and the output MOS module 16, or the charging MOS module 12, the protection MOS module 13, the boosting MOS module 14, and the output MOS module 16 are Metal-Oxide-Semiconductor Field Effect transistors, and a technician can connect the pins of the MOS Transistor with other electronic components according to actual circuit wiring requirements, and the connection scheme of the pins of the MOS Transistor and the electronic components is a conventional and basic technical means in the art, and therefore, is not described in detail.

A VDD pin is led out from a first end of the charging MOS module 12, and a BP pin is led out from a second end. The first end of the protection MOS module 13 leads out a GND pin and is connected to the boost MOS module 14 through the second resistor 92, and the second end leads out a BN pin. The SW pin is led out from a first end of the boost MOS module 14, the VO5 pin is led out from a second end of the boost MOS module and is connected to the positive input end of the twelfth comparator U12, the fourth end of the boost MOS module is connected to the negative input end of the protection MOS module 13 and the eleventh comparator U11 through the second resistor 92, and the GND pin is led out from the fourth end of the boost MOS module, and the fifth end of the boost MOS module is connected to the positive input end of the eleventh comparator U11. The first end of the output MOS module 16 is connected to the detection module 15, the third end of the output MOS module 16 is connected to the charging MOS module 12 and leads out a BP pin, and the second end of the output MOS module 16 leads out a VOUT pin. An EN pin is led out from a first end of the detection module 15, and a second end of the detection module is connected to the output MOS module 16.

The function of each pin (i.e., terminal) of the integrated IC unit 10 is explained below: the VDD pin is a positive input pin of the power supply, and is internally connected to the charging MOS module 12 and the control module 11, and mainly functions to charge the lithium battery 30 and supply power to the control module 11. The EN pin is a high-low level detection pin, is internally connected to the detection module 15, and mainly receives an externally transmitted voltage signal. The PROG pin is a constant current setting pin, is connected to the internal second comparator U2, and is connected to the control module 11, and is mainly used for adjusting the charging current. The CHRG pin is the charge indicator pin, and inside is connected with circuit module such as control circuit, mainly detects lithium cell voltage and detects whether lithium cell 30 is full of the electricity promptly, and then controls the bright state of going out of outside pilot lamp 60. The SW pin is a switch node pin, and is connected to the BP pin through an inductor 70, and mainly controls the on and off states of the boost MOS module 14. The GND pin is a power ground pin, is connected with the ground of the internal circuit module, and is connected with the protection MOS module 13 and the negative phase input end of the eleventh comparator U11; forming a loop with the VDD pin, VOUT pin, and VO5 pin. The BN pin is a negative electrode pin of the battery, is connected to the protection MOS module 13 inside the integrated IC unit 10, and forms a loop with the BP pin outside the integrated IC unit 10. The BP pin is a positive electrode pin of the battery, is connected to the output MOS module 16 and the charging MOS module 12 inside the integrated IC unit 10, and forms a loop with the BN pin outside the integrated IC unit 10. The VO5 pin is a voltage output pin, and is a 5V voltage that is fixedly output by the boost MOS module 14 inside the integrated IC unit 10 after being boosted, and is connected to the positive input terminal of the twelfth comparator U12 and the boost MOS module 14 inside the integrated IC unit 10.

The output terminals of the first comparator U1, the second comparator U2, the third comparator U3, the fourth comparator U4, the fifth comparator U5, the sixth comparator U6, the seventh comparator U7, the eighth comparator U8, the ninth comparator U9, the tenth comparator U10, the eleventh comparator U11 and the twelfth comparator U12 are connected to the control module 11.

A positive input terminal VCC of the first comparator U1 is used for inputting VDD voltage, and a negative input terminal Vovp is used for inputting overvoltage protection voltage reference; a PROG pin is led out from a positive input end of a second comparator U2(CA comparator), and a negative input end Vref1 is used for inputting a reference voltage for setting a charging current; a positive input terminal Tlim of a third comparator U3(TA comparator) is used for inputting the junction temperature in the defined temperature mode, and a negative input terminal Tdie is used for inputting the set temperature node reference; a positive input end BP of the fourth comparator U4 is used for inputting a positive end voltage of the lithium battery 30, and a negative input end Vtrikl is used for inputting a trickle charge threshold voltage reference; a negative input terminal Vref2 of the fifth comparator U5(CA comparator) is used for inputting the reference voltage of the charge indicator lamp 60; a positive input end of a sixth comparator U6 (overcurrent comparator) is connected to positive input ends of a seventh comparator U7 and an eighth comparator U8, and a negative input end Viov1 is used for inputting an overcurrent blocking threshold voltage first reference; a negative input end Viov2 of a seventh comparator U7 (overcurrent comparator) is used for inputting an overcurrent latching threshold voltage second reference; a negative input terminal Vshort of an eighth comparator U8 (load short circuit comparator) is used for inputting a load short circuit latching threshold voltage reference; a positive input end of the ninth comparator U9 (overcharge comparator) is connected to a positive input end of the tenth comparator U10, and a negative input end Vcu is used for inputting an overcharge lockout threshold voltage reference; a negative input end Vdl of a tenth comparator U10 (an overdischarge comparator) is used for inputting an overdischarge locking threshold voltage reference; the eleventh comparator U11 is a current sensor comparator, and has a positive input terminal connected to the boost MOS module 14 and a negative input terminal connected to the protection MOS module 13 and the GND pin; a positive input terminal of a twelfth comparator U12(GM comparator) is connected to the boost MOS module 14 and the lead VO5 pin, and a negative input terminal Vrevf3 is used for inputting and outputting a 5V voltage reference voltage.

In the lithium battery control circuit, a VDD pin of the integrated IC unit 10 is connected to the 5V power supply 20, a BP pin is connected to the anode of the lithium battery 30, a SW pin is connected to the anode of the lithium battery 30 through the inductor 70, and a BN pin is connected to the cathode of the lithium battery 30. In this embodiment, the charge indicator 60 may be a light emitting diode, the CHRG pin of the integrated IC unit 10 is connected to the cathode of the light emitting diode through the first current limiting resistor 91, and the anode of the light emitting diode is connected to the 5V power supply 20 and grounded through the second capacitor 82. Those skilled in the art can flexibly design the connection mode of the CHRG pin and the internal circuit of the control module 11 according to the actual circuit wiring situation. The PROG pin of the integrated IC unit 10 is grounded through the third resistor 93, and the GND pin is grounded. The load 50 is connected between the VOUT pin and ground. Pin VO5 of the IC unit 10 is connected to VIN port of the sensing module 40 and a first pole of the first electrolytic capacitor 81, pin EN is connected to VOUT port of the sensing module 40, and GND port of the sensing module 40 and a second pole of the first electrolytic capacitor 81 are grounded.

As shown in fig. 3, the operation principle of the lithium battery control circuit of the present embodiment will be described below.

St1, controlling the lithium battery charging process.

In this embodiment, the control module 11 controls the MOS transistor of the charging MOS module 12 to be turned on when the voltage of the lithium battery is lower than the third charging voltage, so that the 5V power supply 20 charges the lithium battery 30 through the VDD pin, and the 5V power supply 20 is a dc power supply capable of outputting 5V voltage; the control module 11 controls the MOS transistor of the charging MOS module 12 to be turned off when the lithium battery voltage is higher than the first charging voltage, so as to stop charging the lithium battery 30; wherein the first charging voltage is higher than the third charging voltage. Through the technical scheme of this embodiment, control module 11 can realize real-time detection battery voltage, control the break-make of charging MOS module 12, detect the voltage of VDD pin, when the voltage exceedes the setting value, carry out overvoltage protection.

As shown in fig. 1, the current provided by the 5V power supply 20 is filtered by the second electrolytic capacitor and then input from the VDD pin of the IC unit 10, and is also input from the CHRG pin of the IC unit 10 through the LED charging indicator 60 and the current limiting resistor 91, the LED charging indicator 60 will be turned on during charging, and the LED charging indicator 60 will be turned off after the battery 30 is fully charged; the magnitude of the charging current can be controlled by the magnitude of the third resistor 93 connected to the PROG pin.

Specifically, for example, the first charging voltage is 4.2V, and the third charging voltage is 4V, the control module 11 controls the MOS transistor of the charging MOS module 12 to be turned on when the voltage of the lithium battery is lower than 4V, so that the power supply 20 charges the lithium battery 30 through the VDD pin, and the overcharge release function is implemented; the MOS tube of the charging MOS module 12 is controlled to be disconnected when the voltage of the lithium battery is higher than 4.2V, and the VDD pin cannot supply power to the BP pin, so that the lithium battery 30 is stopped to be charged, and the overcharge protection function is realized.

In a modified scheme, the control module 11 is configured to perform trickle charging when the voltage of the lithium battery is lower than the fourth charging voltage or perform trickle charging when the voltage of the lithium battery is lower than the fourth charging voltage and higher than the fifth charging voltage, and is further configured to perform constant current charging at a preset current when the voltage of the lithium battery is higher than the fourth charging voltage and lower than the second charging voltage, and perform constant voltage charging at a preset voltage when the voltage of the lithium battery is higher than the second charging voltage and lower than the first charging voltage.

Specifically, in one embodiment, for example, if the first, second, third and fourth charging voltages are 4.2V, 4.05V, 4V and 2.9V, respectively, the control module 11 performs trickle charging at 1/10 of the preset current when the voltage of the lithium battery is lower than 2.9V, performs constant current charging at 2.9V and lower than 4.05V of the preset current, and performs constant voltage charging at 4.05V and lower than 4.2V of the preset voltage.

Or, in another embodiment, if the first charging voltage, the second charging voltage, the third charging voltage, the fourth charging voltage, and the fifth charging voltage are 4.2V, 4.0V, 3V, and 2.7V, respectively, the control module 11 performs trickle charging when the voltage of the lithium battery is lower than 3V and higher than 2.7V, performs constant current charging at a preset current when the voltage of the lithium battery is higher than 3V and lower than 4.0V, and performs constant voltage charging at a preset voltage when the voltage of the lithium battery is higher than 4.0V and lower than 4.2V, thereby controlling the charging power of the battery 30.

St2, control the process of powering the sensing module.

When there is no 5V dc voltage, the lithium battery 30 supplies power to the control module 11, and the control module 11 also boosts the voltage of the lithium battery 30 and supplies power to the sensing module 40 through the VO5 pin. Specifically, in the boost output mode, when the lithium battery 30 is powered, the battery voltage enters the SW pin through the inductor 70 from the BP pin of the integrated IC unit 10, and then is boosted through the internal boost MOS module 14 and the boost control circuit, and a preset stable 5V voltage is output at the VO5 pin of the integrated IC unit 10, and meanwhile, the second resistor 92 for implementing the current limiting function is integrated in the control module 11 as the overcurrent limiting resistor of the boost MOS module 14, so that a good current limiting and overcurrent protection function is formed through the eleventh comparator U11. The VIN port of the sensing module 40 is powered by the voltage of 5V through the first electrolytic capacitor 81, so that the sensing module 40 can work normally.

St3, the sensing module performs a sensing process.

The sensing module 40 is used for detecting whether an object enters a preset sensing distance, and when the object is close to the sensing module 40, the sensing module 40 outputs a sensing signal to the EN pin through the VOUT port when detecting that the object enters the preset sensing distance, and the EN pin transmits the sensing signal to the detecting module 15 and then transmits the sensing signal to the control module 11 after receiving the signal. Those skilled in the art can flexibly select a device with an induction function as the induction module 40 according to actual situations, for example, the induction module 40 may be an infrared induction device or a radar induction device. In practical applications, the sensing module 40 may be, for example, a human body, a lamp, a water pump, or the like.

The sensing module 15 is configured to detect a sensing signal voltage of the EN pin and feed back the detection information to the control module 11, and perform St4 process when the sensing module 40 detects that an external object enters a preset sensing distance.

St4, control of the load operation process.

When the control module 11 determines that the sensing signal voltage received by the detection module 15 is at a high level, the detection module 15 controls the output MOS module 16 to be turned on, so that the BP pin and the VOUT pin are turned on, and further, the lithium battery voltage is output to the load 50 through the VOUT pin (i.e., the lithium battery 30 discharges to the external load 50), thereby driving the load 50 to operate.

When sensing module 40 does not sense when having the object to be close to and no longer sensing the object (the object that is close to originally is kept away from), sensing module 40's VOUT port just can not output signal gives the EN pin, and the EN pin does not receive the signal, and detection module 15 receives the sensing signal voltage and is the low level, and control module 11 can not control output MOS module 16 and switches on, and rechargeable battery 30 just can't give load 50 power supply through output MOS module 16, and load 50 is out of work.

The control module 11 is further configured to control the MOS transistor of the protection MOS module 13 to be turned on when the voltage of the lithium battery is higher than the first discharge voltage, so that the lithium battery 30 discharges to the outside; the MOS tube of the control protection MOS module 13 is disconnected when the voltage of the lithium battery is lower than a second discharge voltage; wherein the first discharge voltage is higher than the second discharge voltage. Specifically, for example, the first discharge voltage is 3.0V, and the second discharge voltages are 2.7V, respectively, the control module 11 controls the MOS transistor of the protection MOS module 13 to be turned on when the voltage of the lithium battery is higher than 3.0V, and the MOS transistor is turned on again, so that the lithium battery 30 discharges to the outside, and the overdischarge release function is realized; the MOS tube of the control protection MOS module 13 is disconnected when the voltage of the lithium battery is lower than 2.7V, and the loop between the BN pin and the GND pin is disconnected, so that the lithium battery 30 stops discharging outwards, and the over-discharge protection function is realized.

In a modified solution, the PROG pin and the positive input terminal of the second comparator U2 are connected to the 1uA power supply terminal and grounded through the fourth resistor 94, and the control module 11 further detects the charging temperature inside the integrated IC unit 10 through the third comparator U3, and controls the charging current to decrease to lower the temperature when the temperature is higher than the set value. The control module 11 detects the voltage of the PROG pin and controls the magnitude of the charging current through a 1uA constant current source. The control module 11 also has a function of detecting whether the rechargeable battery 30 is loaded with short circuit, overcurrent, and overdischarge, that is, detecting whether the loaded rechargeable battery 30 is short circuit, the loaded discharge current is greater than a set value (i.e., overcurrent), and the loaded battery voltage is lower than the set value by 2.7V (i.e., overdischarge). Specifically, a VM terminal voltage is set inside the integrated IC unit 10, and in a normal discharge condition, the VM terminal voltage will increase with the increase of the discharge current, the control module 11 enters the over-current protection operating mode when the discharge current increases so that the VM terminal voltage exceeds the current over-discharge protection threshold (the Viov1 reference voltage of the sixth comparator U6), and the control module 11 enters the short-circuit protection operating mode when the discharge current increases so that the VM terminal voltage exceeds the short-circuit protection threshold (the Vshort reference voltage of the eighth comparator U8).

The utility model discloses a lithium battery control circuit is a multi-functional single lithium electricity integrated circuit device, control circuit can solve the battery at the charge-discharge in-process excessive pressure, overflow, overcharge, the scheduling problem of putting excessively, the life of electric core has been prolonged, and control circuit's design has realized simplifying on prior art's basis, simple outside application circuit is particularly suitable for being applied to portable equipment, be fit for USB power and adapter power work, the circuit is prevented filling by the inside adoption of control circuit, do not need the outside to add the isolation diode. The control circuit also meets the requirement of small-sized electric products on protection of the lithium battery, and can ensure high-precision constant-current constant-voltage charge and discharge control management of the battery. Lithium battery control circuit has not only realized lithium battery charging management and protection management, has still integrateed the function of MOS module and output MOS module that steps up, adopts the utility model discloses a lithium battery control circuit, to some will use than higher voltage drive's power consumption module for example bluetooth, WIFI or radar etc., then need not to increase boost circuit in addition again, the function that probably needs 3 or more than 3 integrated circuit to realize originally among the prior art, the utility model discloses a lithium battery control circuit just can accomplish, has simplified circuit design effectively, has reduced the cost of manufacture, has realized the promotion of the compatible of circuit multiple function and performance, can be applied to the response human body, multiple scenes such as lamp or water pumper, convenient to use, and the security is high, has wide market perspective.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.

Claims

1. A battery control circuit, characterized in that,

the charging circuit comprises an integrated IC unit (10), wherein the integrated IC unit (10) comprises a control module (11), a charging MOS module (12) and a protection MOS module (13);

the control module (11) is connected to the charging MOS module (12) and the protection MOS module (13); the charging MOS module (12)/the protection MOS module (13) comprises an MOS tube;

a VDD pin and a BP pin are led out from the charging MOS module (12);

a BN pin and a GND pin are led out from the protection MOS module (13);

the VDD pin is used for being connected to a power supply (20), a battery (30) is connected between the BP pin and the BN pin, and the GND pin is grounded;

the control module (11) is used for controlling the MOS tube of the charging MOS module (12) to be conducted when the battery voltage is lower than a third charging voltage, so that a power supply (20) charges the battery (30) through the VDD pin; controlling the MOS tube of the charging MOS module (12) to be disconnected when the battery voltage is higher than a first charging voltage; wherein the first charging voltage is higher than the third charging voltage;

the control module (11) is also used for controlling the MOS tube of the protection MOS module (13) to be conducted when the battery voltage is higher than a first discharge voltage, so that the battery (30) is discharged to the outside; controlling the MOS tube of the protection MOS module (13) to be disconnected when the battery voltage is lower than a second discharge voltage; wherein the first discharge voltage is higher than the second discharge voltage.

2. The battery control circuit of claim 1,

the integrated IC unit (10) further comprises a boost MOS module (14) connected to the control module (11), the boost MOS module (14) is connected with the protection MOS module (13) through a second resistor (92), and the boost MOS module (14) comprises an MOS tube;

the battery control circuit further comprises an induction module (40), a first electrolytic capacitor (81) and an inductor (70) connected between the BP pin and the SW pin; a VIN port of the sensing module (40) is connected to a VO5 pin of the integrated IC unit (10) and a first pole of the first electrolytic capacitor (81), a VOUT port of the sensing module (40) is connected to an EN pin of the integrated IC unit (10), and a GND port of the sensing module (40) is grounded; a second pole of the first electrolytic capacitor (81) is grounded;

an SW pin and a VO5 pin are led out of the boosting MOS module (14);

the control module (11) is used for controlling the boosting MOS module (14) to boost the battery voltage through a BP pin, an inductor (70) and a SW pin, and outputting a preset stable voltage to a VIN port of the induction module (40) at a VO5 pin;

the sensing module (40) is used for outputting a sensing signal to an EN pin through a VOUT port when an object is detected to enter a preset sensing distance.

3. The battery control circuit of claim 2,

the induction module (40) is an infrared induction device or a radar induction device;

the battery (30) is a lithium battery (30).

4. The battery control circuit of claim 2,

the integrated IC unit (10) further comprises a detection module (15) and an output MOS module (16);

the detection module (15) is connected to the control module (11) and to the output MOS module (16);

an EN pin is led out of the detection module (15);

the output MOS module (16) is also connected to the charging MOS module (12) and leads out a BP pin and a VOUT pin; the output MOS module (16) comprises an MOS tube; the VOUT pin is used for connecting to a load (50);

the detection module (15) is used for detecting the induced signal voltage of the EN pin and feeding back detection information to the control module (11);

the control module (11) is used for controlling the output MOS module (16) to be conducted through the detection module (15) when the sensing signal voltage received by the detection module (15) is at a high level, so that the BP pin and the VOUT pin are conducted, and further, the battery voltage is output to a load (50) through the VOUT pin.

5. The battery control circuit of claim 2,

the integrated IC unit (10) further comprises a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator, a sixth comparator, a seventh comparator, an eighth comparator, a ninth comparator, a tenth comparator, an eleventh comparator and a twelfth comparator;

the output ends of the first comparator, the second comparator, the third comparator, the fourth comparator, the fifth comparator, the sixth comparator, the seventh comparator, the eighth comparator, the ninth comparator, the tenth comparator, the eleventh comparator and the twelfth comparator are connected to the control module (11);

the positive input end of the first comparator is used for inputting VDD voltage, and the negative input end of the first comparator is used for inputting overvoltage protection voltage reference;

a PROG pin is led out of the positive input end of the second comparator, and the negative input end of the second comparator is used for inputting reference voltage for setting charging current; the PROG pin is grounded through a third resistor (93);

the positive input end of the third comparator is used for inputting junction temperature in a limited temperature mode, and the negative input end of the third comparator is used for inputting a set temperature node reference;

the positive input end of the fourth comparator is used for inputting the positive voltage of a battery (30), and the negative input end of the fourth comparator is used for inputting the trickle charge threshold voltage reference;

the negative input end of the fifth comparator is used for inputting the reference voltage of the charging indicator lamp (60);

a positive input end of the sixth comparator is connected to positive input ends of the seventh comparator and the eighth comparator, and a negative input end of the sixth comparator is used for inputting a first reference of an overcurrent blocking threshold voltage;

the negative input end of the seventh comparator is used for inputting a second reference of the overcurrent latching threshold voltage;

the negative input end of the eighth comparator is used for inputting a load short circuit locking threshold voltage reference;

a positive input end of the ninth comparator is connected to a positive input end of the tenth comparator, and a negative input end of the ninth comparator is used for inputting an overcharge locking threshold voltage reference;

a negative input end of the tenth comparator is used for inputting an over-discharge locking threshold voltage reference;

the positive input end of the eleventh comparator is connected to the boosting MOS module (14), and the negative input end of the eleventh comparator is connected to the protection MOS module (13) and a lead-out GND pin;

the positive input end of the twelfth comparator is connected to the boost MOS module (14) and the pin leading out VO5, and the negative input end is used for inputting and outputting a 5V voltage reference voltage.

6. The battery control circuit according to any one of claims 1-5,

the first discharge voltage was 3.0V, and the second discharge voltage was 2.7V, respectively.

7. The battery control circuit according to any one of claims 1-5,

the control module (11) is also used for detecting the charging temperature inside the integrated IC unit (10) through a third comparator, and controlling the charging current to be reduced when the temperature is higher than a set value;

the control module (11) is internally provided with a VM (virtual machine) end voltage, and the control module (11) is used for entering an overcurrent protection working mode when the VM end voltage exceeds a current over-discharge protection threshold value and entering a short-circuit protection working mode when the VM end voltage exceeds a short-circuit protection threshold value.

8. The battery control circuit according to any one of claims 1-5,

the control module (11) is used for performing trickle charging when the battery voltage is lower than a fourth charging voltage or performing trickle charging when the battery voltage is lower than the fourth charging voltage and higher than a fifth charging voltage;

when the battery voltage is higher than the fourth charging voltage and lower than the second charging voltage, performing constant current charging at a preset current;

and performing constant voltage charging at a preset voltage when the battery voltage is higher than the second charging voltage and lower than the first charging voltage.

9. The battery control circuit of claim 8,

the first charging voltage, the second charging voltage, the third charging voltage and the fourth charging voltage are respectively 4.2V, 4.05V, 4V and 2.9V;

alternatively, the first charging voltage, the second charging voltage, the third charging voltage, the fourth charging voltage, and the fifth charging voltage are 4.2V, 4.0V, 3V, and 2.7V, respectively.

10. The battery control circuit of claim 8,

the control module (11) performs trickle charging at a preset current of 1/10 when the battery voltage is lower than the fourth charging voltage;

the battery control circuit further comprises a first current limiting resistor (91) and a charging indicator light (60);

the CHRG pin of the control module (11) is connected to a power supply (20) through the first current limiting resistor (91) and the charging indicator lamp (60).