CN210665868U

CN210665868U - Lithium battery protection circuit for cell voltage acquisition time-sharing gating single-channel AD detection

Info

Publication number: CN210665868U
Application number: CN201921563866.8U
Authority: CN
Inventors: 丁悦; 伏涛; 柯玉龙
Original assignee: Seca Electronic Technology (suzhou) Co Ltd
Current assignee: Seca Electronic Technology (suzhou) Co Ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-06-02
Anticipated expiration: 2029-09-19

Abstract

The utility model relates to a cell voltage gathers timesharing gating single channel AD and detects lithium electricity protection circuit, including N electric core, partial pressure detection module, LDO power module, the charge-discharge protection module that concatenates, charge-discharge drive module, LED lamp display module and control module, the output of electric core links to each other with partial pressure detection module's sense terminal, partial pressure detection module's output links to each other with control module's input, control module's control end links to each other with the input of electric core through charge-discharge protection module, LDO power module's output end links to each other with the control module supply end, control module's control end links to each other with the input of charging-discharge drive module, control module's control end still links to each other with LED lamp display module's input. The utility model discloses the development cost of singlechip lectotype has been reduced.

Description

Lithium battery protection circuit for cell voltage acquisition time-sharing gating single-channel AD detection

Technical Field

The utility model relates to a cell voltage gathers timesharing gating single channel AD and detects lithium electricity protection circuit.

Background

In recent years, along with the rapid development of the new energy lithium battery industry, the application of the lithium ion battery has penetrated into various industries, and the lithium ion battery covers a plurality of fields such as consumer electronics, various types of electric tools, new energy electric vehicles, industrial energy storage and the like, and data analysis shows that the industrial scale still keeps a multiplied growth situation in the next few years, so that the demand of the lithium ion battery is greatly stimulated.

Lithium batteries have advantages of small size, high energy density, no memory effect, long cycle life, and low self-discharge rate, but unlike nickel-cadmium and nickel-hydrogen batteries, lithium batteries must consider safety during charging and discharging to prevent characteristic deterioration. For example, in the overcharged state, the energy becomes excessive as the battery temperature rises, and the electrolyte decomposes to generate gas, which may cause spontaneous combustion or rupture due to the rise in internal pressure; on the contrary, in the over-discharged state, the electrolyte is decomposed to deteriorate the battery characteristics and durability, thereby reducing the number of times of charging. Therefore, it is important to protect the lithium battery from overcharge, overdischarge, overcurrent, and short circuit, and a protection board having a lithium battery control protection function is usually designed in the battery pack.

The protection plate has two schemes, one is to directly monitor and protect the lithium battery cell through a special lithium battery protection IC, and the other is to adopt a single chip microcomputer to realize the protection function of the lithium battery cell through a program control peripheral circuit.

IC schemes are divided into two categories: single-section cascading and multi-string integration schemes. Single-section cascade scheme: one IC monitors the voltage of a string of batteries, the number of protective plates of the strings of ICs is as many as the number of ICs, the number of strings of ICs can be downward compatible, the application is flexible, the defects are that the functions of temperature protection and charging overcurrent protection are not available, and the performance is not stable in an integrated scheme. Multi-string integration scheme: one IC is monitoring the voltage of a plurality of strings of batteries simultaneously, and has the advantages that: the device has the functions of temperature protection and charging overcurrent protection, and has the following defects compared with a single-section cascade scheme: the string number is single, and the down compatibility with other string numbers cannot be realized.

Disadvantages of the lithium battery protection IC scheme: although a plurality of brands of lithium battery protection chips are available in the market at present, the lithium battery protection chips have different performances, incomplete functions, inflexible use and relatively low price. For example, in certain domestic brands of such chips, the ESD resistance is weak, the power consumption is large, and the first power-on failure is caused; although some products with earlier foreign brands have stable performance after years of market verification, the price is still high, and the supply is extremely unstable due to the influence of the trade war of China and America, which has adverse effect on mass production; moreover, most of the chips do not contain the electric quantity to indicate the related extended functions of the lithium battery products, for example, the protection chip of the lithium battery can not perform real-time monitoring and protection on the output voltage and current of an external charger when charging, and the protection chip needs an additional hardware circuit or a single chip microcomputer program to realize the real-time monitoring and protection, and the development cost is increased inevitably.

And (3) protecting the singlechip program: the battery cell voltage is collected through the single chip microcomputer ad conversion module, the functions of charging, discharging, overcurrent and temperature protection are achieved, more customized functions can be expanded according to customer requirements, such as pressure difference detection, electric quantity indication and abnormal state LED indication, even a motor drive control function can be integrated, and compared with a common hardware protection IC scheme, the power consumption can be lower.

The single chip microcomputer scheme is as follows: the single chip microcomputer scheme can make up for the defects of the hardware protection IC, but various new requirements of customers are met, higher requirements are provided for the performance of the single chip microcomputer, for example, the dominant frequency is high enough, the memory is large enough, certain driving capability is provided, an advanced low-power-consumption mode, higher ad detection resolution and the like can increase development cost more or less, particularly the performance of an ad module is directly related to the cell voltage detection precision and the possibility of realizing the protection function. For example, a general 8-bit 20pin single chip microcomputer, the number of general AD sampling channels does not exceed 8, when the number of strings of a battery pack reaches 5, 5 AD channels are needed for detecting the voltage of a battery cell, 3 channels are left for detecting the discharge current and the charge current, and detecting the temperature of the battery cell, at this time, the AD channel resources are just enough, and when the number of strings of the battery pack reaches more than 6 or 7 strings, or a client requires to monitor the temperature of a mos tube, and the voltage of a charger detects other extension functions, the 8-channel AD detection module is obviously insufficient. Generally, a single chip microcomputer with more pins and correspondingly more AD channels or an AD type special single chip microcomputer with more AD channels and unchanged pin number can be selected, which will increase the development cost.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing an electricity core voltage gathers timesharing gating single channel AD and detects lithium electricity protection circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a cell voltage gathers timesharing gating single channel AD and detects lithium electricity protection circuit, includes N electric core, partial pressure detection module, LDO power module, the protection module that charges and discharges, fills and discharges drive module, LED lamp display module and the control module that concatenates, the output of electric core links to each other with partial pressure detection module's sense terminal, partial pressure detection module's output links to each other with control module's input, control module's control end links to each other with the input of electric core through the protection module that charges and discharges, LDO power module's output end links to each other with the control module supply end, control module's control end links to each other with the input of filling and discharging drive module, control module's control end still links to each other with LED lamp display module's input.

Preferably, the control module comprises a chip U2, the chip U2 is a single chip microcomputer, and the type of the chip U2 is N76E 003.

Preferably, the voltage division detection module includes a plurality of identical detection modules, and the detection modules are mutually independent, each detection module includes a chip U1, the first pin of chip U1 is grounded, the second pin of chip U1 is connected with one end of a resistor R22, the other end of the resistor R22 is connected to the twelfth pin of chip U2, the third pin of chip U1 is connected with one end of a resistor R19, the other end of the resistor R19 is connected to the twentieth pin of chip U2, the fourth pin of chip U1 is connected to a battery core, and is also connected to an LDO power supply module and is connected to one end of a resistor R16, the other end of the resistor R16 is connected to the fifth pin of chip U1, and the sixth pin of chip U1 is connected to the fifth pin of chip U1 through a resistor R21.

Preferably, the model of the chip U1 is MMDT5451/SOD 363.

Preferably, the LDO power supply module includes a chip U3, a first pin of the chip U3 is grounded, a second pin of the chip U3 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to a cathode of a diode D1, an anode of the diode D1 is connected to a drain of a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the voltage Vbat, and is further connected to the voltage division detection module, a zener diode ZD1, a resistor R2 and a capacitor C3 are connected between a gate and a gate of the MOS transistor Q1 in parallel, wherein a cathode of the zener diode ZD1 is connected to the gate, a gate of the MOS transistor Q1 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to a collector of a transistor Q3, an emitter of the transistor Q3 is grounded, a base of the transistor Q3 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to a cathode of the diode D3, and an anode of the diode D3 is connected to a first pin of the capacitor C3, the anode of the diode D2 is grounded through a resistor R11, the other end of the resistor R9 is also connected with the cathode of the diode D3, the anode of the diode D3 is connected with the switch module, a resistor R10 is connected between the base and the emitter of the triode, a capacitor C7 is connected in parallel to the resistor R10, a capacitor C4 and a capacitor C5 which are connected in parallel are connected between the first pin of the chip U3 and the resistor R1 and are grounded, the third pin of the chip U3 is connected with VCC +5V, and the third pin is connected to ground through the capacitor C1 and the capacitor C2 which are connected in parallel.

Preferably, the model of the chip U3 is HT7550, the model of the diode D1 is 1SS357/SOD323, the models of the diode D2 and the diode D3 are IN4148/SOD323, the model of the triode Q3 is MMBT5551/SOT _23_123, the model of the MOS transistor Q1 is AM235 2359PE/SOT _23_ GDS, and the model of the zener diode ZD1 is 9V/SOD 123.

Preferably, it is characterized in that: the charge-discharge driving module comprises a chip U4, wherein fifth pins to eighth pins of the chip U4 are connected to a B + terminal, first pins to third pins of the chip U4 are connected to a cathode of a diode DC1, an anode of a diode DC1 is connected to a C + terminal, a diode DC1 is connected in parallel with a diode DC2, a resistor R36 is connected between the first pin to the third pin and the fourth pin of the chip U4, a fourth pin of the chip U4 is connected to one terminal of a resistor R33, the other terminal of the resistor R33 is connected to a drain of a MOS transistor Q14, a source of the MOS transistor Q14 is grounded, a gate of the MOS transistor Q14 is connected to a tenth pin of the chip U14 through the resistor R14, a resistor R14 is connected between the gate and the source of the MOS transistor Q14, an anode of the diode DC 14 is connected to the ground through the resistor R14 and the source of the MOS transistor Q14, and a gate of the MOS transistor Q14 is connected to an eighteenth pin of the MOS transistor Q14, and a gate of the MOS transistor Q14 is connected to a gate of the MOS transistor V365, and a gate of the, the source of the MOS transistor Q10 is connected to ground through a resistor R42.

Preferably, the model of the chip U4 is AO4435, and the models of the MOS transistor Q14 and the MOS transistor Q10 are both 2N 7002.

Preferably, the charge and discharge protection module includes a transistor QD1, a transistor QD2, and a transistor Q9, the gates, sources, and gates of the transistor QD1 and the transistor QD2 are connected in parallel, the drain of the transistor QD1 is connected to the B + terminal through a diode D2, the diode D2 is connected in parallel with capacitors CM1 and CM2 connected in series, the drain is also connected to the P-/C-terminal, the source of the transistor QD1 is connected to the B-terminal through a resistor RS1 and is grounded, the transistor QD1 is also connected to the nineteenth pin of the chip U2 through a resistor R20, the resistor R20 is connected to one terminal of a capacitor C7 and the other terminal is grounded, the gate of the transistor QD1 is connected to the fourteenth pin of the chip U2 through a resistor R23 and is also connected to the emitter of a transistor Q9, the base of the transistor Q9 is connected to the fourteenth pin of the chip U2 through a resistor R21, the collector of the transistor Q9 is connected to the source of the transistor Q1, the gate of the MOS transistor QD1 is connected to the source of the MOS transistor QD1 through a resistor R22.

Preferably, the model of the MOS tube QD1 and the model of the MOS tube QD2 are 8726, and the model of the triode Q9 is MMBT 5401.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

the utility model discloses cell voltage gathers timesharing gating single channel AD and detects lithium electricity protection scheme technically not only can realize battery overvoltage and undervoltage protection, overcurrent protection, basic protect function such as high low temperature protection, and can pass through cell voltage timesharing gating return circuit, only with an AD passageway, all electric core voltages of multiplexing detection, AD passageway number has been saved, make the AD passageway that comes out more be used for other analog quantity to gather, make singlechip availability factor higher, function expansibility is stronger, or compensate the trouble that the commonality 8bit singlechip shared the channel number is not enough when the singlechip is making high string number detection, development cost has been saved; meanwhile, the detection loop is completely turned off when the acquisition is not needed, so that the power consumption of the whole system is reduced; through the calibration of electrification, the detection precision of the cell voltage can be optimized, hardware lithium battery protection IC can be completely replaced, the functions are expanded, and meanwhile, the development cost is greatly reduced.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic diagram of a control module of the present invention;

fig. 3 is a schematic diagram of the connection between the voltage division detection module and the LDO power supply module according to the present invention;

fig. 4 is a schematic view of the charge and discharge driving module of the present invention;

fig. 5 is a schematic diagram of the charge and discharge protection module of the present invention;

fig. 6 is a schematic diagram of the switch module of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in fig. 1, a cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit, including a plurality of N cells 1, a partial pressure detection module 2, an LDO power supply module 3, a charge-discharge protection module 7, a charge-discharge drive module 5, an LED light display module 4 and a control module 6 that are connected in series, the output of the cell 1 is connected with the detection end of the partial pressure detection module 2, the output of the partial pressure detection module 2 is connected with the input of the control module 6, the control end of the control module 6 is connected with the input of the cell 1 through the charge-discharge protection module 7, the output end of the LDO power supply module 3 is connected with the power supply end of the control module 6, the control end of the control module 6 is connected with the input of the charge-discharge drive module 5, and the control end of the control module 6 is also connected with the input of.

The partial pressure detection module 2 detects all the cell voltages through one AD detection channel in a time-sharing multiplexing mode, the number of the AD channels for detecting the cell voltages is saved, more AD detection channels are left for detecting other analog quantities, the service efficiency of the single chip microcomputer is higher, and the function expansibility is stronger. And when the channel is gated for detection, the detection loop is opened through the switch tube, and when the channel is not detected, the switch tube is turned off to cut off the detection loop, so that the purpose of reducing power consumption is achieved, and the service life of the battery pack is prolonged.

As shown in fig. 2, the control module includes a chip U2, the chip U2 is a single chip microcomputer, and its model number is N76E003, wherein the twentieth pin of the chip U2 is grounded through a resistor R55 and is also grounded through a capacitor C19, while the thirteenth, fifteenth, sixteenth and seventeenth pins of the chip U2 are all connected to their respective detection modules, while the second, third, fifth and sixth pins of the chip U2 are connected to the LED light display module, the fourth pin of the chip U2 is connected to 5V voltage through a resistor R50 and is also grounded through a capacitor C40, the ninth pin is grounded through one end of the capacitors C16 and C15 connected in parallel, and the other end is connected to VCC + 5V.

The LED light display module 4 includes a light emitting diode and a resistor connected in series and connected to the second, third, fifth and sixth pins of the chip U2.

As shown in fig. 3, the voltage division detection module includes a plurality of identical detection modules, which are arranged independently of each other, the detection modules include a chip U1, a first pin of the chip U1 is grounded, a second pin of the chip U1 is connected to one end of a resistor R22, the other end of the resistor R22 is connected to a twelfth pin of the chip U2, a third pin of the chip U1 is connected to one end of a resistor R19, the other end of the resistor R19 is connected to a twentieth pin of the chip U2, a fourth pin of the chip U1 is connected to a battery core, and is also connected to the LDO power supply module and to one end of the resistor R16, the other end of the resistor R16 is connected to a fifth pin of the chip U1, and a sixth pin of the chip U1 is connected to a fifth pin of the chip U1 through a resistor R21.

One end of each of the detection modules is connected to the twentieth pin, i.e., the AD end, of the chip U2.

The model of the chip U1 in the utility model is MMDT5451/SOD 363.

The LDO power supply module comprises a chip U3, a first pin of the chip U3 is grounded, a second pin of the chip U3 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a cathode of a diode D1, an anode of a diode D1 is connected with a drain of a MOS tube Q1, a gate of the MOS tube Q1 is connected with a voltage Vbat, and is further connected with a voltage division detection module, a zener diode ZD1, a resistor R2 and a capacitor C3 are connected between a gate and a gate of the MOS tube Q1 in parallel, wherein a cathode of a zener diode ZD1 is connected with the gate, a gate of the MOS tube Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with a collector of a triode Q3, an emitter of the triode Q3 is grounded, a base of the triode Q3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with a cathode of the diode D3, an anode of the diode D3 is connected with one end of the capacitor C3, and, the anode of the diode D2 is grounded through a resistor R11, the other end of the resistor R9 is also connected with the cathode of the diode D3, the anode of the diode D3 is connected with the switch module, a resistor R10 is connected between the base and the emitter of the triode, a capacitor C7 is connected in parallel to the resistor R10, a capacitor C4 and a capacitor C5 which are connected in parallel are connected between the first pin of the chip U3 and the resistor R1 and are grounded, the third pin of the chip U3 is connected with VCC +5V, and the third pin is connected to ground through the capacitor C1 and the capacitor C2 which are connected in parallel.

As shown in fig. 6, the switch module includes a MOS transistor Q5, a source of the MOS transistor Q5 is connected to a voltage Vbat, a gate of the MOS transistor Q5 is connected to the voltage Vbat through a resistor R12, a drain of the MOS transistor Q5 is connected to an anode of a diode D3 through a resistor R13, and is grounded through a resistor R15, a gate of the MOS transistor Q5 is further connected to one end of the diode S1, the other end of the transistor Q5 is connected to an eleventh pin of the chip U2, and is further connected to a cathode of a zener diode ZD2, the anode of the diode ZD2 is grounded, and a resistor R25 is connected to the diode ZD 2.

The MOS transistor Q5 is BSS84AK/SOT _23_ GDS.

The type of the chip U3 is HT7550, the type of the diode D1 is 1SS357/SOD323, the types of the diode D2 and the diode D3 are IN4148/SOD323, the type of the triode Q3 is MMBT5551/SOT _23_123, the type of the MOS transistor Q1 is AM2359PE/SOT _23_ GDS, and the type of the zener diode ZD1 is 9V/SOD 123.

As shown in fig. 4, the charge and discharge driving module includes a chip U4, fifth to eighth pins of the chip U4 are connected to a B + terminal, first to third pins of the chip U4 are connected to a cathode of a diode DC1, an anode of a diode DC1 is connected to a C + terminal, a diode DC1 is connected in parallel with the diode DC2, a resistor R36 is connected between the first to third pins and the fourth pin of the chip U4, a fourth pin of the chip U4 is connected to one terminal of a resistor R33, the other terminal of the resistor R33 is connected to a drain of a MOS transistor Q14, a source of the MOS transistor Q14 is grounded, a gate of the MOS transistor Q14 is connected to a tenth pin of the chip U2 through a resistor R30, a resistor R32 is connected between a gate and a source of the MOS transistor Q14, an anode of the diode DC 32 is connected to the ground through a resistor R32 and a drain of the MOS transistor Q32, and an eighteenth pin of the MOS transistor Q32 is connected to a source of the MOS transistor Q32, the grid electrode of the MOS transistor Q10 is connected with the voltage 5V through a resistor R41, and the source electrode of the MOS transistor Q10 is grounded through a resistor R42;

the model of the chip U4 is AO4435, and the models of the MOS tube Q14 and the MOS tube Q10 are both 2N 7002.

As shown in fig. 5, the charge and discharge protection module includes a transistor QD1, a transistor QD2, and a transistor Q9, the gates, sources, and gates of the transistor QD1 and the transistor QD2 are connected in parallel, the drain of the transistor QD1 is connected to the B + terminal through a diode D2, the diode D2 is connected in parallel to capacitors CM1 and CM2 connected in series, the drain is also connected to the P-/C-terminal, the source of the transistor QD1 is connected to the B-terminal through a resistor RS1 and is grounded, and is also connected to the nineteenth pin of the chip U2 through a resistor R20, the resistor R42 is connected to one terminal of a capacitor C7 and the other terminal is grounded, the gate of the transistor QD1 is connected to the fourteenth pin of the chip U2 through a resistor R23 and is also connected to the emitter of a transistor Q9, the base of the transistor Q9 is connected to the fourteenth pin of the chip U2 through a resistor R21, the source of the transistor QD1, the gate of the MOS transistor QD1 is connected to the source of the MOS transistor QD1 through a resistor R22.

The MOS tube QD1 and the MOS tube QD2 are 8726 in model, and the triode Q9 is MMBT5401 in model.

The terminals B + and B-are two terminals of the battery, and the terminal P-/C-is a charger terminal.

The chip 2 is used for calibrating the programmed single chip before one time of delivery to eliminate various interferences, such as errors of an LDO power supply module, errors of elements, circuit board wiring impedance, maximum acquisition errors of an AD conversion module and the like, and influences on acquisition precision, power is supplied, a calibration signal is detected by a single chip calibration mode detection pin, a low level is pulled down to enter a calibration mode, external equipment acquires peripheral ports for the single chip battery cell and supplies reference voltage to the peripheral ports, the single chip sequentially gates each acquisition channel to the same single chip AD acquisition port in a time-sharing manner, an actual battery cell voltage value is calculated according to the acquired AD value and is compared with the given reference voltage to obtain an error value detected by each channel, the error value is stored in an EEPROM of the single chip to prepare for normal operation of a system next time, compensation is called when the battery cell voltage is acquired, and a value obtained in the calibration compensation manner is obtained, the general precision can reach within 15mV, is higher than the precision of hardware lithium electricity protection IC.

After calibration, the single chip microcomputer can start to work normally by electrifying again, and the method comprises detection of voltage of each circuit of the battery cell, judgment of over-charge or over-discharge abnormity, detection of charge and discharge current, judgment of discharge overcurrent or charge overcurrent abnormity, detection and abnormity judgment of high and low temperature of the battery cell and the like. When the system does not detect abnormality during discharging, the discharging MOS tube is kept in a closed state, and when the system works during charging, if the abnormality is not detected, the charging MOS tube is kept in an open state, meanwhile, when the single chip microcomputer works, the real-time electric quantity is calculated and presented in an LED sectional display mode, and when various abnormal conditions occur, the LED indicates the occurrence of the abnormality.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a cell voltage gathers timesharing gating single channel AD and detects lithium electricity protection circuit which characterized in that: including a plurality of electric core, partial pressure detection module, LDO power module, the protection module that charges and discharges that concatenates, charge and discharge drive module, LED lamp display module and control module, the output of electric core links to each other with partial pressure detection module's sense terminal, partial pressure detection module's output links to each other with control module's input, control module's control end links to each other with the input of electric core through charging and discharging protection module, LDO power module's output end links to each other with the control module feed end, control module's control end links to each other with charge and discharge drive module's input, control module's control end still links to each other with LED lamp display module's input.

2. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 1, characterized in that: the control module comprises a chip U2, the chip U2 is a single chip microcomputer, and the type of the single chip microcomputer is N76E 003.

3. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 1, characterized in that: the partial pressure detection module includes the same detection module of a plurality of, for mutual independence sets up, detection module includes chip U1, chip U1's first pin ground connection sets up, chip U1's second pin links to each other with resistance R22's one end, resistance R22's the other end is connected to chip U2's twelfth pin, chip U1's third pin links to each other with resistance R19's one end, resistance R19's the other end is connected to chip U2's twentieth pin, chip U1's fourth pin links to each other with the electricity core, and still with LDO power module, and link to each other through resistance R16's one end, resistance R16's the other end links to each other with chip U1's fifth pin, chip U1's sixth pin links to each other with chip U1's fifth pin through resistance R21.

4. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 3, characterized in that: the model of the chip U1 is MMDT5451/SOD 363.

5. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 1, characterized in that: the LDO power supply module comprises a chip U3, a first pin of the chip U3 is grounded, a second pin of the chip U3 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with a cathode of a diode D1, an anode of a diode D1 is connected with a drain of a MOS tube Q1, a gate of the MOS tube Q1 is connected with a voltage Vbat, and is further connected with a voltage division detection module, a zener diode ZD1, a resistor R2 and a capacitor C3 are connected between a gate and a gate of the MOS tube Q1 in parallel, wherein a cathode of a zener diode ZD1 is connected with the gate, a gate of the MOS tube Q1 is connected with one end of a resistor R4, the other end of a resistor R4 is connected with a collector of a triode Q3, an emitter of the triode Q3 is grounded, a base of the triode Q3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with a cathode of the diode D3, an anode of the diode D3 is connected with one end of the capacitor C3, and, the anode of the diode D2 is grounded through a resistor R11, the other end of the resistor R9 is also connected with the cathode of the diode D3, the anode of the diode D3 is connected with the switch module, a resistor R10 is connected between the base and the emitter of the triode, a capacitor C7 is connected in parallel to the resistor R10, a capacitor C4 and a capacitor C5 which are connected in parallel are connected between the first pin of the chip U3 and the resistor R1 and are grounded, the third pin of the chip U3 is connected with VCC +5V, and the third pin is connected to ground through the capacitor C1 and the capacitor C2 which are connected in parallel.

6. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 5, characterized in that: the type of the chip U3 is HT7550, the type of the diode D1 is 1SS357/SOD323, the types of the diode D2 and the diode D3 are IN4148/SOD323, the type of the triode Q3 is MMBT5551/SOT _23_123, the type of the MOS tube Q1 is AM2359PE/SOT _23_ GDS, and the type of the zener diode ZD1 is 9V/SOD 123.

7. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 1, characterized in that: the charge-discharge driving module comprises a chip U4, wherein fifth pins to eighth pins of the chip U4 are connected to a B + terminal, first pins to third pins of the chip U4 are connected to a cathode of a diode DC1, an anode of a diode DC1 is connected to a C + terminal, a diode DC1 is connected in parallel with a diode DC2, a resistor R36 is connected between the first pin to the third pin and the fourth pin of the chip U4, a fourth pin of the chip U4 is connected to one terminal of a resistor R33, the other terminal of the resistor R33 is connected to a drain of a MOS transistor Q14, a source of the MOS transistor Q14 is grounded, a gate of the MOS transistor Q14 is connected to a tenth pin of the chip U14 through the resistor R14, a resistor R14 is connected between the gate and the source of the MOS transistor Q14, an anode of the diode DC 14 is connected to the ground through the resistor R14 and the source of the MOS transistor Q14, and a gate of the MOS transistor Q14 is connected to an eighteenth pin of the MOS transistor Q14, and a gate of the MOS transistor Q14 is connected to a gate of the MOS transistor V365, and a gate of the, the source of the MOS transistor Q10 is connected to ground through a resistor R42.

8. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 7, characterized in that: the model of the chip U4 is AO4435, and the models of the MOS tube Q14 and the MOS tube Q10 are both 2N 7002.

9. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 1, characterized in that: the charge and discharge protection module comprises a MOS tube QD1, a MOS tube QD2 and a triode Q9, wherein the gates, the sources and the gates of the MOS tube QD1 and the MOS tube QD2 are connected in parallel, the drain of the MOS tube QD1 is connected with the B + end through a diode D2, a capacitor CM1 and a CM2 which are connected in series are connected on the diode D2 in parallel, the drain is also connected with the P-/C-end, the source of the MOS tube QD1 is connected with the B-end through a resistor RS1 and is arranged in parallel, the source of the MOS tube QD1 is also connected with the nineteenth pin of the chip U2 through a resistor R20, one end of the capacitor C7 is connected on the resistor R20, the other end of the resistor is grounded, the gate of the MOS tube QD 9 is connected with the fourteenth pin of the chip U2 through a resistor R23 and is also connected with the emitter of a triode Q9, the base of the triode Q9 is connected with the fourteenth pin of the triode 6 21, the collector of, the gate of the MOS transistor QD1 is connected to the source of the MOS transistor QD1 through a resistor R22.

10. The battery cell voltage acquisition time-sharing gating single-channel AD detection lithium battery protection circuit according to claim 9, characterized in that: the model of the MOS tube QD1 and the model of the MOS tube QD2 are 8726, and the model of the triode Q9 is MMBT 5401.