CN202513609U

CN202513609U - Lithium cell management system

Info

Publication number: CN202513609U
Application number: CN2012200529990U
Authority: CN
Inventors: 朱宁宁; 蒋闯; 韩竞科
Original assignee: JIANGSU RICHPOWER NEW ENERGY TECHNOLOGY Co Ltd
Current assignee: JIANGSU RICHPOWER NEW ENERGY TECHNOLOGY Co Ltd
Priority date: 2012-02-17
Filing date: 2012-02-17
Publication date: 2012-10-31
Anticipated expiration: 2022-02-17

Abstract

The utility model exposes a lithium cell management system, which comprises a processor, a power supply module, a voltage sampling module, a large current detecting and controlling module, a low current detecting and controlling module, a short circuit detecting and controlling module, an over current detecting and controlling module, a button awakening and detecting module, a load awakening module, an electric quantity display module, a temperature detecting module, a charger detecting module, a discharge port reverse electromotive force absorbing module, a charge switch and a control module of the charge switch. The lithium cell management system provided by the invention can effectively reduce energy consumption, provides a lithium cell pack with over charge protection function, over discharge protection function, over current protection function, short circuit protection function, temperature protection function as well as electric quantity display function and low current detection discharge prohibition function. In case of any situation of over discharge protection, over current protection, short circuit protection, temperature protection, charge or discharge failure or very low current discharge, a whole circuit enters a dormant state.

Description

Lithium battery management system

Technical field

The utility model belongs to battery management of power use technical field, relates to a kind of battery management system, relates in particular to a kind of lithium battery management system.

Background technology

Along with being widely used of products such as digital product such as mobile phone, notebook computer, lithium battery is used widely in this series products with the performance of excellence, and is progressively developing to other product applications in recent years.Yet existing lithium battery management system also comes with some shortcomings, and is higher like existing lithium battery management circuit power consumption.

A kind of harmless lithium battery balanced management system and method are disclosed like Chinese patent CN201110053928.2.Said harmless lithium battery balanced management system comprises at least two battery modules, and each module comprises a cell, an equalizing circuit and a single-chip microcomputer.Said single-chip microcomputer and said cell and equalizing circuit connect the information that is used to obtain monomer battery voltage and equalizing circuit relevant control to be provided and to protect.The balanced management module connects said single-chip microcomputer, and the monomer battery voltage that is used for providing according to said single-chip microcomputer produces reference signal.Single-chip microcomputer in each said battery module is according to said reference signal; Controlling said equalizing circuit carries out balanced to said cell; Its extra discharge is shunted or made to equalizing circuit to the balanced cell of needs, obtains equilibrium with this, simultaneously with the energy recuperation utilization; Improve system effectiveness, and reduced power consumption.Battery balanced management system disclosed in the utility model and balanced management method are applicable to the various operating states of battery pack, have simple in structure, modular construction, practical, characteristics that energy recuperation utilizes.

Chinese patent CN201010162444.7 has proposed a kind of lithium battery management system for another example, is made up of following module: MCU (little processing) module, power module, total voltage acquisition module, current acquisition module, insulation monitoring module, relay control and diagnostic module, HANDSHAKE (handshake) transceiver module, CAN transceiver module, non-volatile memory module and battery

module monitoring unit

1,2....N.This management system can be carried out real-time monitoring to the lithium battery monomer voltage, and the big battery cell of state difference is carried out equilibrium control, improves the consistency of lithium battery system.Simultaneously, this management system can also be to the total voltage of lithium battery system, operating current, temperature, state of insulation and battery SOC SOH carry out comprehensive monitoring and management, and send data in real time to car load other electric-control system through the CAN network.

Such scheme is all less than the power problems that thoroughly solves the lithium battery management circuit.

The utility model content

The utility model technical problem to be solved is: a kind of lithium battery management system is provided, can effectively reduces power consumption.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of lithium battery management system, said system comprises: processor, power module, voltage sample module, big current detecting and control module, little current detecting and control module, short-circuit detecting and control module, over-current detection and control module, button wakes up and detection module, load wake module, electricity quantity display module, temperature detecting module, charger detection module, discharge mouthful inverse electromotive force absorb module, charge switch and a control module thereof; Said processor respectively with power module, voltage sample module, big current detecting and control module, little current detecting and control module, short-circuit detecting and control module, over-current detection and control module, button wakes up and detection module, load wake module, electricity quantity display module, temperature detecting module, charger detection module, discharge mouthful inverse electromotive force absorb a module, charge switch and control module thereof and be connected;

Said load wake module is in order to timely responsive load state, fast the start-up circuit of wake up process device and power module;

Said load wake module comprises some voltage-stabiliser tubes, some resistance, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, capacitor C 12, and metal-oxide-semiconductor M8, metal-oxide-semiconductor M9 are connected with capacitor C 12, and metal-oxide-semiconductor M8 connects the WAKEUP network;

Said load wake module is connected with the P-/C-network, and when P-/C-network level changed from low to high, WAKE UP network can produce the low level of a fixed width; When P-/C-network level changes from high to low, the electric weight of the rapid emptying capacitor C 12 of metal-oxide-semiconductor M9 meeting, ready for starting next time.

As a kind of preferred version of the utility model, said load wake module comprises voltage-stabiliser tube Z3, voltage-stabiliser tube Z4, voltage-stabiliser tube Z5, resistance R 35, resistance R 36, resistance R 37, resistance R 38, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, capacitor C 12;

1 pin of voltage-stabiliser tube Z3 is connected to the P-/C-network; 2 pin of voltage-stabiliser tube Z3 are connected to 1 pin of resistance R 35, and 2 pin of resistance R 35 are connected with 2 pin of voltage-stabiliser tube Z4,1 pin of resistance R 36, the 1 pin grid of metal-oxide-semiconductor M9 simultaneously, and 2 pin of resistance R 36 are connected to ground; 1 pin of voltage-stabiliser tube Z4 is connected with the 3 pin source electrodes of metal-oxide-semiconductor M9,1 pin of capacitor C 12 simultaneously; The 2 pin drain electrode of metal-oxide-semiconductor M9 is connected to 1 pin of R37, and 2 pin of R37 are connected to ground, and 2 pin of capacitor C 12 are connected with 1 pin of voltage-stabiliser tube Z5,1 pin of resistance R 38, the 1 pin grid of metal-oxide-semiconductor M8 simultaneously; 2 pin of voltage-stabiliser tube Z5 are connected to ground; 2 pin of resistance R 38 are connected to ground, and the 3 pin source electrodes of metal-oxide-semiconductor M8 are connected to ground, and the 2 pin drain electrode of metal-oxide-semiconductor M8 is connected to WAKE UP network.

As a kind of preferred version of the utility model, said little current detecting and control module be in order to the little electric current in the detection system, and when electric current during less than set point, big current detecting and control module are closed, and detect size of current by little current detecting and control module.

As a kind of preferred version of the utility model, said little current detecting and control module comprise resistance R 34, resistance R 43, resistance R 33, resistance R S3, metal-oxide-semiconductor M6, metal-oxide-semiconductor DMS3;

1 pin of R34 is connected to the DSG2 network; The DSG2 network is connected to 4 pin of MCU, and 2 pin of R34 are connected with 1 pin of R43, the 1 pin grid of M6 simultaneously, and 2 pin of R43 are connected to the 5V network; The 3 pin source electrodes of M6 are connected to ground; The 2 pin drain electrode of M6 is connected with 1 pin of R33, the 4 pin grids of DMS3 simultaneously, and 2 pin of R33 are connected to the PULL network, and the 1 pin source electrode of DMS3,2 pin source electrodes, 3 pin source electrodes are connected with 1 pin, the OCN2 network of RS3 simultaneously; 2 pin of RS3 are connected to ground, and the 5 pin drain electrode of DMS3, the drain electrode of 6 pin, the drain electrode of 7 pin, the drain electrode of 8 pin are connected to the P-/C-network simultaneously.

A kind of preferred version as the utility model; Said power module comprises diode D1, diode D2, triode Q1, voltage-stabiliser tube Z1; Metal-oxide-semiconductor M1, metal-oxide-semiconductor M2, metal-oxide-semiconductor NMOS; Three-terminal voltage-stabilizing power supply U1, resistance R 24, R3, R4, R5, R6, R7, R1, R2, capacitor C 5, C6, C1, C2, C3, C4;

1 pin of diode D1 is connected to the B+ network, and the B+ network is connected to total positive pole of battery; 2 pin of diode D1 are connected to the 3 human hair combing waste emitter-base bandgap gradings of triode Q1, and 2 pin of diode D1 are connected with 2 pin of diode D2,1 pin of resistance R 24 simultaneously, and 2 pin of diode D2 are connected to the C+ network, and the C+ network is the positive pole that is connected to charger;

The 1 pin base stage of triode Q1 is connected with 2 pin of resistance R 24,1 pin of resistance R 3 simultaneously, and 2 pin of resistance R 3 are connected with the 2 pin drain electrode of metal-oxide-semiconductor M1, the 2 pin drain electrode of metal-oxide-semiconductor M2 simultaneously;

The 1 pin grid of metal-oxide-semiconductor M1 is connected with 1 pin of

resistance R

4,1 pin of

resistance R

5,1 pin of capacitor C 5 simultaneously; The 3 pin source electrodes of metal-oxide-semiconductor M1 are connected to ground; 2 pin of resistance R 4 are connected to the POWER network; And the POWER network is 12 pin that are connected to processor, and 2 pin of resistance R 5 are connected to ground, and 2 pin of capacitor C 5 are connected to ground;

The 1 pin grid of metal-oxide-semiconductor M2 is connected with 1 pin of

resistance R

6,1 pin of

resistance R

7,1 pin of capacitor C 6 simultaneously, and the 3 pin source electrodes of metal-oxide-semiconductor M2 are connected to ground, and 2 pin of resistance R 6 are connected to the C+ network, and 2 pin of resistance R 7 are connected to ground, and 2 pin of capacitor C 6 are connected to ground;

The 2 pin collector electrodes of triode Q1 are connected with 1 pin of R1,1 pin of R2 simultaneously, and 2 pin of R2 are connected with 1 pin of voltage-stabiliser tube Z1,1 pin of capacitor C 1, the 4 pin grids of metal-oxide-semiconductor NMOS simultaneously, and 2 pin of voltage-stabiliser tube Z1 are connected to ground, and 2 pin of capacitor C 1 are connected to ground;

2 pin of resistance R 1 are connected with the drain electrode of 5 pin, the drain electrode of 6 pin, the drain electrode of 7 pin, the drain electrode of 8 pin of metal-oxide-semiconductor NMOS simultaneously;

The 1 pin source electrode of metal-oxide-semiconductor NMOS, 2 pin source electrodes, 3 pin source electrodes are connected with 1 pin of capacitor C 2, the 2 pin input pins of three-terminal voltage-stabilizing power supply U1 simultaneously; 2 pin of capacitor C 2 are connected to ground; The 1 pin grounding leg of three-terminal voltage-stabilizing power supply U1 is connected to ground; The 3 pin output pins of three-terminal voltage-stabilizing power supply U1 are connected with 1 pin of

capacitor C

3,1 pin of capacitor C 4, the network of 5V simultaneously, and 2 pin of capacitor C 3 are connected to ground, and 2 pin of capacitor C 4 are connected to ground.

As a kind of preferred version of the utility model, the voltage sample module comprises metal-oxide-semiconductor M4, metal-oxide-semiconductor M5, resistance R 8, R9, R17, R11, R12, R10, capacitor C 8, C9;

The 3 pin source electrodes of metal-oxide-semiconductor M4 are connected with 1 pin of R8, are connected with the B+ network simultaneously, and the B+ network is connected to total positive pole of battery;

The 1 pin grid of metal-oxide-semiconductor M4 is connected with 2 pin of

resistance R

8,1 pin of resistance R 17 simultaneously; 2 pin of resistance R 17 are connected to the 2 pin drain electrode of metal-oxide-semiconductor M5; The 3 pin source electrodes of metal-oxide-semiconductor M5 are connected to ground, and the 1 pin grid of metal-oxide-semiconductor M5 is connected with 1 pin of resistance R 11,1 pin of R12,1 pin of capacitor C 8 simultaneously, and 2 pin of resistance R 11 are connected to the 5V network; 2 pin of resistance R 12 are connected to ground, and 2 pin of capacitor C 8 are connected to ground;

The 2 pin drain electrode of metal-oxide-semiconductor M4 is connected to 1 pin of R9, and 2 pin of resistance R 9 are connected with 1 pin, 1 pin of capacitor C 9, the VOT network of resistance R 10 simultaneously, and the VOT network is connected to 14 pin of processor, and 2 pin of resistance R 10 are connected to ground, and 2 pin of capacitor C 9 are connected to ground.

As a kind of preferred version of the utility model, said big current detecting and control module comprise resistance R 31, R44, R28, R29, R30, R32, RS1, RS2, metal-oxide-semiconductor M7, metal-oxide-semiconductor DMS1, metal-oxide-semiconductor DMS2, triode Q3, triode Q4;

1 pin of resistance R 31 is connected to network DSG1, and metal-oxide-semiconductor DSG1 network is connected to 17 pin of processor, and 2 pin of resistance R 31 are connected with 1 pin of resistance R 44, the 1 pin grid of metal-oxide-semiconductor M7 simultaneously;

The 3 pin source electrodes of metal-oxide-semiconductor M7 are connected with 2 pin collector electrodes, 1 pin of resistance R 32, the 3 pin source electrodes of metal-oxide-semiconductor DMS1, the 3 pin source electrodes of metal-oxide-semiconductor DMS2,1 pin of resistance R S1,1 pin of resistance R S2, the OCN1 network of triode Q4 simultaneously; 2 pin of resistance R S1 are connected to 2 pin of resistance R S2, are connected to ground simultaneously;

The 2 pin drain electrode of metal-oxide-semiconductor M7 is connected with the 1 pin base stage of triode Q4, the 1 pin base stage of triode Q3,1 pin of resistance R 28 simultaneously; 2 pin of resistance R 28 are connected with 2 pin collector electrodes, the PULL network of triode Q3 simultaneously; The 3 human hair combing waste emitter-base bandgap gradings of triode Q3 are connected to 1 pin of resistance R 29,2 pin of resistance R 29 are connected with 1 pin of resistance R 30,2 pin of resistance R 32, the 1 pin grid of metal-oxide-semiconductor DMS1, the 1 pin grid of metal-oxide-semiconductor DMS2 simultaneously; 2 pin of resistance R 30 are connected to the 3 human hair combing waste emitter-base bandgap gradings of triode Q4, and the 2 pin drain electrode of metal-oxide-semiconductor DMS1, the 2 pin drain electrode of metal-oxide-semiconductor DMS2 are connected to the P-/C-network simultaneously.

As a kind of preferred version of the utility model, button wakes up and detection module comprises and often opens button SW1, resistance R 14, R15, capacitor C 15, metal-oxide-semiconductor M10;

1 pin of often opening button SW1 is connected to the B+ network; 2 pin of often opening button SW1 are connected to 1 pin of resistance R 14; 2 pin of resistance R 14 are connected with 1 pin of capacitor C 15,1 pin of R15, the 1 pin grid of metal-oxide-semiconductor M10 simultaneously, and 2 pin of capacitor C 15 are connected to ground, and 2 pin of resistance R 15 are connected to ground; The 3 pin source electrodes of metal-oxide-semiconductor M10 are connected to ground, and the 2 pin drain electrode of metal-oxide-semiconductor M10 is connected to WAKE UP network.

A kind of lithium battery management system, said system comprises: processor, power module, voltage sample module, load wake module, charger detection module; Said processor is connected with power module, voltage sample module, load wake module, charger detection module respectively;

Said load wake module comprises some voltage-stabiliser tubes, some resistance, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, capacitor C 12, and metal-oxide-semiconductor M8, metal-oxide-semiconductor M9 are connected with capacitor C 12, and metal-oxide-semiconductor M8 connects WAKE UP network;

The beneficial effect of the utility model is: the lithium battery management system that the utility model proposes, can effectively reduce power consumption.The utility model system is that a lithium battery battery bag provides over-charge protective, crosses and put protection, overcurrent protection, short-circuit protection, temperature protection function, and electric quantity display function is provided, little current detecting is forbidden discharging function.Externally have five interface: B+ (total positive pole of power brick), B-(total negative pole of power brick just), C+ (positive pole of charger), P+ (positive pole of load also is the total positive pole that is connected to power brick during discharge), P-/C-(negative pole of load when the negative pole of charger and discharge).Entire circuit took place to put protection, overcurrent protection, short-circuit protection, temperature protection, the situation of not discharging of not charging or when very the arbitrary situation of situation of low discharging current takes place entire circuit to get into resting state.The power consumption that gets into after the dormancy is extremely low, when charger connects after or discharge load connect after or be will wake entire circuit rapidly up after button is pressed, charge or discharge perhaps electric weight demonstration.

Description of drawings

Fig. 1 is the composition sketch map of the utility model lithium battery management system.

Fig. 2 is the circuit diagram of the utility model system power supply module.

Fig. 3 is the circuit diagram of the utility model system voltage sampling module.

Fig. 4 is the circuit diagram of big current detecting of the utility model system and control module.

Fig. 5 is the circuit diagram of little current detecting of the utility model system and control module.

Fig. 6 is the circuit diagram of detection of the utility model system short-circuit and control module.

Fig. 7 is the circuit diagram of the utility model system over-current detection and control module.

Fig. 8 wakes up and the circuit diagram of detection module for the utility model system button.

Fig. 9 is the circuit diagram of the utility model system load wake module.

Figure 10 is the circuit diagram of the utility model system electricity quantity display module.

Figure 11 is the circuit diagram of the utility model system temperature detection module.

Figure 12 is the circuit diagram of the utility model system charger detection module.

Figure 13 is the circuit diagram that the utility model system discharge mouth inverse electromotive force absorbs module.

Figure 14 is the circuit diagram of the utility model system charge switch and control module thereof.

Embodiment

Specify the preferred embodiment of the utility model below in conjunction with accompanying drawing.

Embodiment one

See also Fig. 1; The utility model has disclosed a kind of lithium battery management system, and said system comprises: processor MCU 1, power module 2, voltage sample module 3, big current detecting and control module 4, little current detecting and control module 5, short-circuit detecting and control module 6, over-current detection and control module 7, button wakes up and detection module 8, load wake module 9, electricity quantity display module 10, temperature detecting module 11, charger detection module 12, discharge mouthful inverse electromotive force absorb module 13, charge switch and a control module 14 thereof.Said processor MCU 1 respectively with power module 2, voltage sample module 3, big current detecting and control module 4, little current detecting and control module 5, short-circuit detecting and control module 6, over-current detection and control module 7, button wakes up and detection module 8, load wake module 9, electricity quantity display module 10, temperature detecting module 11, charger detection module 12, discharge mouthful inverse electromotive force absorb a module 13, charge switch and control module 14 thereof and be connected.Below introduce the composition of each module respectively.

The operation principle explanation:

Entire circuit is to be that a lithium battery battery bag provides over-charge protective, crosses and put protection, overcurrent protection, short-circuit protection, temperature protection function, and electric quantity display function is provided, little current detecting is forbidden discharging function.Externally have five interface: B+ (total positive pole of power brick), B-(total negative pole of power brick just), C+ (positive pole of charger), P+ (positive pole of load also is the total positive pole that is connected to power brick during discharge), P-/C-(negative pole of load when the negative pole of charger and discharge).Entire circuit took place to put protection, overcurrent protection, short-circuit protection, temperature protection, the situation of not discharging of not charging or when very the arbitrary situation of situation of low discharging current takes place entire circuit to get into resting state.The power consumption that gets into after the dormancy is extremely low, when charger connects after or discharge load connect after or be will wake entire circuit rapidly up after button is pressed, charge or discharge perhaps electric weight demonstration.

The MCU of part 1 partly is the core of entire circuit among Fig. 1.

[power module]

Power module is the power pack of whole system, and its circuit is as shown in Figure 2, and this part circuit comprises diode D1, D2; Triode Q1; Voltage-stabiliser tube Z1, metal-oxide-semiconductor M1, M2, NMOS, three-terminal voltage-stabilizing power supply U1; Resistance R 24, R3, R4, R5, R6, R7, R1, R2, capacitor C 5, C6, C1, C2, C3, C4.

1 pin of D1 is connected to the B+ network, and the B+ network is connected to total positive pole of battery.2 pin of D1 are connected to the 3 human hair combing waste emitter-base bandgap gradings of Q1, and 2 pin of D1 are connected with 2 pin of D2,1 pin of R24 simultaneously, and 2 pin of D2 are connected to the C+ network, and the C+ network is the positive pole that is connected to charger.The 1 pin base stage of Q1 is connected with 2 pin of R24,1 pin of R3 simultaneously; 2 pin of R3 are connected with the 2 pin drain electrode of M1, the 2 pin drain electrode of M2 simultaneously, and the 1 pin grid of M1 is connected with 1 pin of R4,1 pin of R5,1 pin of C5 simultaneously, and the 3 pin source electrodes of M1 are connected to ground; 2 pin of R4 are connected to the POWER network; And the POWER network is 12 pin that are connected to MCU, and 2 pin of R5 are connected to ground, and 2 pin of C5 are connected to ground.The 1 pin grid of M2 is connected with 1 pin of R6,1 pin of R7,1 pin of C6 simultaneously, and the 3 pin source electrodes of M2 are connected to ground, and 2 pin of R6 are connected to the C+ network, and 2 pin of R7 are connected to ground, and 2 pin of C6 are connected to ground.The 2 pin collector electrodes of Q1 are connected with 1 pin of R1,1 pin of R2 simultaneously, and 2 pin of R2 are connected with 1 pin of Z1,1 pin of C1, the 4 pin grids of NMOS simultaneously, and 2 pin of Z1 are connected to ground, and 2 pin of C1 are connected to ground.2 pin of R1 are connected with the drain electrode of 5 pin, the drain electrode of 6 pin, the drain electrode of 7 pin, the drain electrode of 8 pin of NMOS simultaneously.The 1 pin source electrode of NMOS, 2 pin source electrodes, 3 pin source electrodes are connected with 1 pin of C2, the 2 pin input pins of U1 simultaneously; 2 pin of C2 are connected to ground; The 1 pin grounding leg of U1 is connected to ground; The 3 pin output pins of U1 are connected with 1 pin of C3,1 pin of C4, the network of 5V simultaneously, and 2 pin of C3 are connected to ground, and 2 pin of C4 are connected to ground.

As shown in Figure 2; Power brick and charger can provide working power for entire circuit; The cathode voltage of power brick and charger is added to the emitter of Q1 to voltage through a diode respectively, realizes the break-make of the emitter and collector of Q1 then through the state of control WAKE UP network.

When WAKE UP network is low level, the emitter and collector conducting of Q1.

When WAKE UP network was high-impedance state, the emitter and collector of Q1 broke off.

Control two approach that have of WAKE UP network state in this part circuit.

The one, the POWER signal of MCU output.The level of POWER network is added to the grid of M1 through the dividing potential drop of R4 and R5; When the POWER network is high level; The source electrode conducting of the drain electrode of M1 and M1, the drain electrode of the M1 just level of WAKE UP network pulled down to ground, when POWER is low level; The drain electrode of M1 and the source electrode of M1 end, and the state of WAKE UP network is a high-impedance state.Be exactly MCU after entire circuit is waken up through output POWER signal be high level, make circuit can not get into dormancy.

The 2nd, the C+ signal that the charger positive pole provides; After charger connects; Be added to the grid of M2 after the dividing potential drop of the cathode voltage of charger through R6 and R7, make the drain electrode of M2 and the source electrode conducting of M2, the drain electrode of the M2 just level of WAKE UP network pulled down to ground; Under the situation that charger does not connect, the drain electrode of M2 just WAKE UP network is a high-impedance state.

When the drain electrode of M1 and any pipe of M2 pulled down to ground, the state of WAKE UP network all was a low level.

After the emitter and collector conducting of Q1; The cathode power supply that cathode power supply that power brick provides or charger provide just is added to the collector electrode of Q1; Be added to the input of three-terminal voltage-stabilizing power supply then after the step-down of the voltage stabilizing of process 15V voltage-stabiliser tube and NMOS, 5V level of three-terminal voltage-stabilizing power supply output.

MCU can make the POWER level of output before getting into dormancy be the power supply that low level is cut off MCU itself, realizes low-power consumption.

[voltage sample module]

The circuit of voltage sample module is as shown in Figure 3, comprises metal-oxide-semiconductor M4, M5, resistance R 8, R9, R17, R11, R12, R10, capacitor C 8, C9.

The 3 pin source electrodes of M4 are connected with 1 pin of R8, are connected with the B+ network simultaneously, and the B+ network is connected to total positive pole of battery.The 1 pin grid of M4 is connected with 2 pin of R8,1 pin of R17 simultaneously; 2 pin of R17 are connected to the 2 pin drain electrode of M5; The 3 pin source electrodes of M5 are connected to ground, and the 1 pin grid of M5 is connected with 1 pin of R11,1 pin of R12,1 pin of C8 simultaneously, and 2 pin of R11 are connected to the 5V network; 2 pin of R12 are connected to ground, and 2 pin of C8 are connected to ground.The 2 pin drain electrode of M4 is connected to 1 pin of R9, and 2 pin of R9 are connected with 1 pin, 1 pin of C9, the VOT network of R10 simultaneously, and the VOT network is connected to 14 pin of MCU, and 2 pin of R10 are connected to ground, and 2 pin of C9 are connected to ground.

As shown in Figure 3, the cathode voltage of power brick through behind the metal-oxide-semiconductor M4 of a P raceway groove again through R9 and R10 dividing potential drop, the filtering that the voltage after partial signal passes through C9 is input to 14 pin of MCU.The break-make of drain electrode and source electrode through control M5 in the circuit of this part is controlled the break-make of M4 source electrode and drain electrode.

When the drain electrode of M5 is low level, the source electrode of M4 and drain electrode conducting.The cut-in voltage sampling.

When the drain electrode of M5 was high-impedance state, the source electrode of M4 broke off with drain electrode.Forbid voltage sample.

When entire circuit did not have dormancy, the 5V power supply was added on the grid of M5 through the dividing potential drop of R11 and R12, made drain electrode and the source electrode conducting of M5, and the drain electrode of M5 pulled down to ground.Make the source electrode and drain electrode conducting of M4, the cut-in voltage sampling.After the entire circuit dormancy, the 5V power supply is cut off, and the drain electrode of M5 and source electrode break off, and make the drain electrode of M5 be in high-impedance state, and the source electrode of M4 and drain electrode are broken off, and forbids voltage sample.

[big current detecting and control module]

The circuit of big current detecting and control module is as shown in Figure 4, comprises resistance R 31, R44, R28, R29, R30, R32, RS1, RS2, metal-oxide-semiconductor M7, DMS1, DMS2, triode Q3, Q4.

1 pin of R31 is connected to network DSG1, and the DSG1 network is connected to 17 pin of MCU, and 2 pin of R31 are connected with 1 pin of R44, the 1 pin grid of M7 simultaneously.The 3 pin source electrodes of M7 are connected with 2 pin collector electrodes, 1 pin of R32, the 3 pin source electrodes of DMS1, the 3 pin source electrodes of DMS2,1 pin of RS1,1 pin of RS2, the OCN1 network of Q4 simultaneously, and 2 pin of RS1 are connected to 2 pin of RS2, are connected to ground simultaneously.The 2 pin drain electrode of M7 is connected with the 1 pin base stage of Q4, the 1 pin base stage of Q3,1 pin of R28 simultaneously; 2 pin of R28 are connected with 2 pin collector electrodes, the PULL network of Q3 simultaneously; The 3 human hair combing waste emitter-base bandgap gradings of Q3 are connected to 1 pin of R29,2 pin of R29 are connected with 1 pin of R30,2 pin of R32, the 1 pin grid of DMS1, the 1 pin grid of DMS2 simultaneously; 2 pin of R30 are connected to the 3 human hair combing waste emitter-base bandgap gradings of Q4, and the 2 pin drain electrode of DMS1, the 2 pin drain electrode of DMS2 are connected to the P-/C-network simultaneously.

As shown in Figure 4, when current flowing resistance RS1 and RS2, can be that the position of OCN1 network produces certain pressure drop on RS1 and RS2, this pressure drop is input to MCU later on through the filtering of the 7th partial circuit among Fig. 1.MCU can judge this filtered voltage signal; If less than certain voltage value, the DSG1 network output low level of MCU output is through the resistance of adjustment R44 and R31; Make the dividing potential drop at the grid place of M7 be not enough to opening M OS pipe M7; Make drain electrode and the source electrode of M7 break off, the collector and emitter conducting of Q3 at this moment, the emitter and collector of Q4 breaks off.The voltage at PULL network place is added to the grid of DMS1 and DMS2 through emitter, the R29 of Q3 collector electrode, Q3.Make drain electrode and the source electrode conducting of DMS1 and DMS2.If MCU sample pressure drop on RS1 and the RS2 through filtered voltage greater than certain value, the DSG1 network of MCU output is a high-impedance state, the voltage of 5V is added in the grid of M7 through R44; Make drain electrode and the source electrode conducting of M7; This moment, the collector and emitter of Q3 broke off, and the emitter and collector conducting of Q4 pulls down to the grid of DMS1 and DMS2 the level at OCN1 network place; And the maximum tens millivolts voltage of level at OCN1 network place, so the drain electrode of DMS1 and DMS2 and source electrode break off.When the electric current on passing through RS1 and RS2 is very little; The pressure drop that on RS1 and RS2, produces is also very little, and this moment, MCU also can be through DSG1 network output high-impedance state, and the voltage of 5V is added in the grid of M7 through R44; Make drain electrode and the source electrode conducting of M7; This moment, the collector and emitter of Q3 broke off, and the emitter and collector conducting of Q4 pulls down to the grid of DMS1 and DMS2 the level at OCN1 network place; And the maximum tens millivolts voltage of level at OCN1 network place, so the drain electrode of DMS1 and DMS2 and source electrode break off.

[little current detecting and control module]

The circuit of little current detecting and control module is as shown in Figure 5, comprises resistance R 34, R43, R33, RS3, metal-oxide-semiconductor M6, DMS3.

As shown in Figure 5; When the discharge mouth of entire circuit had among Fig. 1 the big current detecting of the 4th part and control section can't detected very little electric current flow through, MCU output DSG1 network was a high resistant, made the DMS1 in the 4th partial circuit and drain electrode and the source electrode disconnection of DMS2 among Fig. 1; MCU can be with DSG2 network output low level then; The resistance of adjustment R43 and R34, the voltage that makes the M6 grid get can't be managed M6 by opening M OS, and the drain electrode of M6 and source electrode break off; The voltage at PULL network place is added on 4 pin of DMS3 through R33; Make 5 pin drain electrodes, the drain electrode of 6 pin, the drain electrode of 7 pin, the drain electrode of 8 pin and 1 pin source electrode, 2 pin source electrodes, the 3 pin source electrode conductings of DMS3, this moment the very little electric current RS3 that will flow through because the resistance of RS3 is bigger; The voltage signal at OCN2 network place is input to MCU later on through the filtering of the 7th partial circuit among Fig. 1, and MCU makes according to this filtered voltage signal and judges whether and will the level at DSG1 network and DSG2 network place be adjusted.

[short-circuit detecting and control module]

The circuit of short-circuit detecting and control section is as shown in Figure 6, comprises resistance R 25, R26, R27, capacitor C 10, triode Q2.

1 pin of R25 is connected to the 5V network, and 2 pin of R25 are connected to the 2 pin collector electrodes of Q2, is connected with the SC network simultaneously, and the SC network is connected to 6 pin of MCU.The 3 human hair combing waste emitter-base bandgap gradings of Q2 are connected to ground, and the 1 pin base stage of Q2 is connected with 1 pin of R27,1 pin of R26,1 pin of C10 simultaneously, and 2 pin of R27 are connected to the OCN1 network, and 2 pin of R26 are connected to ground, and 2 pin of C10 are connected to ground.

As shown in Figure 6, when the discharge mouth P+ of this circuit and P-/C-short circuit, moment has very big electric current two resistance in the 4th partial circuit among Fig. 1 of flowing through.Thereby can produce bigger voltage at OCN1 network place; Be added in the base stage of Q2 after the dividing potential drop of the voltage at OCN1 network place through R27 and R26; Make the collector and emitter conducting of Q2; The collector electrode of Q2 pulled down to ground, and the voltage at SC network place transfers present low level to by original 5V, and the reverse signal at SC network place is input to MCU.MCU receives the signal of output short circuit protection after this reverse signal.

[over-current detection and control module]

The circuit of over-current detection voltage filter part is as shown in Figure 7, comprises resistance R 13, R45, capacitor C 17, C7.

1 pin of R13 is connected to 1 pin of C17, is connected with the OC1 network simultaneously, and the OC1 network is connected to 19 pin of MCU, and 2 pin of C17 are connected to ground, and 2 pin of R13 are connected to the OCN1 network.1 pin of R45 is connected to 1 pin of C7, is connected with the OC2 network simultaneously, and the OC2 network is connected to 18 pin of MCU, and 2 pin of C7 are connected to ground, and 2 pin of R45 are connected to the OCN2 network.

As shown in Figure 7, in this partial circuit, the voltage at OCN1 network place come arrogant electric current to flow through the RS1 in the 4th partial circuit goes up the voltage signal of generation with RS2 among Fig. 1.The voltage at OCN2 network place comes electric current from childhood to flow through, and the RS3 in the 5th partial circuit goes up the voltage signal that produces among Fig. 1.Be input to MCU behind the voltage process R13 at OCN1 network place and the C17 capacitance-resistance filter, be input to MCU behind the voltage process R45 at OCN2 network place and the C7 capacitance-resistance filter.

[button wakes up and detection module]

Button wake up and the circuit of test section as shown in Figure 8, comprise and often open button SW1, resistance R 14, R15, capacitor C 15, metal-oxide-semiconductor M10.

1 pin of SW1 is connected to the B+ network; 2 pin of SW1 are connected to 1 pin of R14; 2 pin of R14 are connected with 1 pin of C15,1 pin of R15, the 1 pin grid of M10 simultaneously, and 2 pin of C15 are connected to ground, and 2 pin of R15 are connected to ground; The 3 pin source electrodes of M10 are connected to ground, and the 2 pin drain electrode of M10 is connected to the WAKEUP network.

As shown in Figure 8, after button SW1 pressed conducting, power brick voltage was through the dividing potential drop of R14 and R15, and voltage one is the grid that is added to M10 here, and the drain electrode of M10 and source electrode conducting make the drain electrode of M10 pulled down to low level.This moment, the voltage at WAKE UP network place was low level, make in the circuit of part 2 among Fig. 1 the Q1 conducting, electric power starting; Entire circuit is waken up, and the 2nd, after MCU is waken up, can detect the voltage division signal at KEY network place; Make MCU judge button and press, need to show electric weight this moment.

[load wake module]

It is as shown in Figure 9 that load wakes circuit partly up, comprises voltage-stabiliser tube Z3, Z4, Z5, resistance R 35, R36, R37, R38, metal-oxide-semiconductor M9, M8, capacitor C 12.

1 pin of Z3 is connected to the P-/C-network, and 2 pin of Z3 are connected to 1 pin of R35, and 2 pin of R35 are connected with 2 pin of Z4,1 pin of R36, the 1 pin grid of M9 simultaneously; 2 pin of R36 are connected to ground, and 1 pin of Z4 is connected with the 3 pin source electrodes of M9,1 pin of C12 simultaneously, and the 2 pin drain electrode of M9 is connected to 1 pin of R37; 2 pin of R37 are connected to ground; 2 pin of C12 are connected with 1 pin of Z5,1 pin of R38, the 1 pin grid of M8 simultaneously, and 2 pin of Z5 are connected to ground, and 2 pin of R38 are connected to ground; The 3 pin source electrodes of M8 are connected to ground, and the 2 pin drain electrode of M8 is connected to WAKE UP network.

As shown in Figure 9, entire circuit when operate as normal does not have dormancy, among Fig. 1 in the 4th partial circuit grid of DMS1 and DMS2 all be high level, drain electrode and the source electrode of DMS1 and DMS2 are in conducting state, connect the load application of directly discharging this moment.When entire circuit is in resting state; The level at the POWER place among Fig. 1 in the part 2 circuit is a low level; WAKE UP network place is a high-impedance state, among Fig. 1 in the 15th partial circuit grid of DMS1 and DMS2 all be low level, the grid of the DMS3 among Fig. 1 in the 5th partial circuit also is a low level.This moment is when connecting load; The discharge load voltage just in highest terms just voltage of B+ network is added to P-/C-network place through discharge load, and P-/C-network place voltage is added to C12 one end through voltage-stabiliser tube Z3, R35, Z4, and C12 is charged; Because the voltage at electric capacity two ends can not be undergone mutation; So C12 other end transient voltage also is the voltage that equals the C12 other end, through the resistance of adjustment R35 and R38, the voltage that is created on the M8 grid can be so that the drain electrode of M8 and source electrode moment conducting.So just making WAKE UP network place is low level.Part 2 is known when the level of WAKE UP network is low level from Fig. 1, can make the emitter and collector conducting of Q1 to wake entire circuit up.When load be connected on discharge mouthful and protection or overcurrent protection or short-circuit protection etc. took place to put to get into dormancy before; MCU will do the delay of a period of time; Make C12 electric capacity charging finish, if there is not the delay of this section period, the moment that dormancy will occur getting into can be waken up once more.Owing to R35, R36, all be the very big resistance of resistance, after the entire circuit dormancy,, can not produce very big power consumption like this even discharge load is connected on the discharge mouth always yet.The effect of Z3 is to reduce to be added in a part of voltage on R35 and the R36, thereby reduces power consumption.Load is connected on discharge mouthful, when protection or overcurrent protection or short-circuit protection took place to put, among Fig. 1 in the 15th partial circuit DMS1 and DMS2 drain and source electrode can be controlled disconnection by MCU; The voltage at B+ network place will be added in P-/C-network place moment; This moment C12 begin the charging, remove discharge load after, connect load more fast and go to wake up entire circuit; If the charge discharge on the capacitor C 12 is too slow, the voltage that B+ network place at this time will occur can not charge to C12 through load.Can not charge to C12, then the M8 grid just can not produce the voltage of the drain electrode and the source electrode conducting that are enough to make M8.WAKE UP network place does not just have low level to occur, so just can't wake entire circuit up.Addressing this problem is exactly to utilize M9 to come the electric charge on the abrupt release C12, after load removes, because the unilateral conduction of Z4; The M9 source voltage is just let out electricity after being lower than the voltage stabilizing value of Z4 nowhere, and the grid of M9 can be let out electricity fast through R36 resistance, this moment M9 source electrode and grid between will voltage difference; This voltage difference is enough to opening M OS pipe M9; Make M9 source electrode with the drain electrode conducting, moment bleeds off the electric charge on the C12 fast, thereby has guaranteed can wake entire circuit up when load connects once more.R35 and R38 dividing potential drop opening M 8, R36 provides for the grid of M9 and lets out electric pathway, and R37 gives the source electrode and drain electrode current limliting of M9.Z4 one utilizes its unilateal conduction, and the another one effect is to avoid the source electrode of M9 and the pressure reduction between the grid excessive, damages metal-oxide-semiconductor M9.The effect of Z5 is that high pressure appears in the grid that prevents M8, damages metal-oxide-semiconductor M8.

[electricity quantity display module]

The circuit of electric weight display part is shown in figure 10, comprises four LED lamp LED1, LED2, LED3, LED4, resistance R 39, R40, R41, R42.

1 pin of 1 pin of LED1,1 pin of LED2, LED3,1 pin of LED4 are connected to the 5V network simultaneously, and 2 pin of LED1 are connected to 1 pin of R39, and 2 pin of R39 are connected to the LED1 network; The LED1 network is connected to 8 pin of MCU, and 2 pin of LED2 are connected to 1 pin of R40, and 2 pin of R40 are connected to the LED2 network; The LED2 network is connected to 9 pin of MCU, and 2 pin of LED3 are connected to 1 pin of R41, and 2 pin of R41 are connected to the LED3 network; The LED3 network is connected to 7 pin of MCU; 2 pin of LED4 are connected to 1 pin of R42, and 2 pin of R42 are connected to the LED4 network, and the LED4 network is connected to 5 pin of MCU.

Shown in figure 10, MCU is through controlling the light on and off of LED1, LED2, LED3, four LED lamps of LED4 to the variation of LED1 network, LED2 network, LED3 network, LED4 network output high-low level.

[temperature detecting module]

The circuit of temperature detection part is shown in figure 11, comprises resistance R 16, temperature sensor RT1, capacitor C 16.

1 pin of R16 is connected to the 5V network, and 2 pin of R16 are connected with 1 pin, 1 pin of C16, the temp network of RT1 simultaneously, and the temp network is connected to 16 pin of MCU, and 2 pin of RT1 and 2 pin of C16 are connected to ground simultaneously.

Shown in figure 11, the 5V power supply is through the dividing potential drop of R16 and temperature sensor RT1, with the temp network punish voltage signal be input to MCU after passing through C16 filtering.

[charger detection module]

The circuit of charger test section is shown in figure 12, comprises resistance R 18, R19.

1 pin of R18 is connected to the C+ network, and 2 pin of R18 are connected with 1 pin, the CTEST network of R19 simultaneously.The CTEST network is connected to 13 pin of MCU, and 2 pin of R19 are connected to ground.

Shown in figure 12, after charger connects, can be that CTEST network place produces a voltage signal at R18 and R19 junction, whether MCU has this voltage signal to judge whether charger connects through detecting.

[discharge mouthful inverse electromotive force absorbs module]

The circuit of discharge mouthful inverse electromotive force absorption module is shown in figure 13, comprises diode DC2, capacitor C 13, C14.

2 pin of DC2,1 pin of C13 are connected to the B+ network simultaneously, and 1 pin of DC2 is connected to the P-/C-network, and 1 pin of DC2 also is connected to 2 pin of C14 simultaneously, and 2 pin of C13 are connected to 1 pin of C14.

Shown in figure 13; The load of discharge mouth is generally inductive loads such as motor; The moment that the drain electrode of DMS1 and DMS2 and source electrode break off in the 15th partial circuit in Fig. 1; Can produce bigger inverse electromotive force between discharge mouthful P+ and the P-/C-, inverse electromotive force can absorb through the diode DC2 in this partial circuit, capacitor C 13, C14.

[charge switch and control module thereof]

The circuit of charge switch and control section thereof the diode DC1 that comprises shown in figure 14, metal-oxide-semiconductor CMS1, M3, voltage-stabiliser tube Z2, resistance R 20, R21, R22, R23, capacitor C 11.

2 pin of DC1 are connected to the B+ network, and 1 pin of DC1 is connected with the drain electrode of 5 pin, the drain electrode of 6 pin, the drain electrode of 7 pin, the drain electrode of 8 pin of CMS1 simultaneously, and the 1 pin source electrode of CMS1,2 pin source electrodes, 3 pin source electrodes are connected with 1 pin, 1 pin of R20, the C+ network of Z2 simultaneously.The 4 pin grids of CMS1 are connected with 2 pin of Z2,2 pin of R20,1 pin of R21 simultaneously; 2 pin of R21 are connected to the 2 pin drain electrode of M3; The 1 pin grid of M3 is connected with 1 pin of C11,1 pin of R22,1 pin of R23 simultaneously, and the 3 pin source electrodes of M3 are connected to ground, and 2 pin of C11 are connected to ground; 2 pin of R23 are connected to ground, and 2 pin of R22 are connected to the CHG network.

Shown in figure 14, when the voltage at the CHG network place of MCU output was high level, the voltage at CHG network place will be added to through the dividing potential drop of R22 and R23 on the grid of M3; Make drain electrode and the source electrode conducting of M3, the drain electrode of M3 will pulled down to low level, and this moment is when charger is connected on charge port; The voltage at C+ network place will produce pressure drop on R20, through the value of adjustment R20 and R21, can make this pressure drop to manage CMS1 by opening M OS; The source electrode of CMS1 will conducting with drain electrode like this, begins charging.When the voltage at the CHG network place of MCU output was low level, the voltage on the grid of M3 was zero, made the drain electrode of M3 and source electrode break off; The drain electrode of M3 is in high-impedance state; Even if this moment, charger was when being connected on charge port, R20 is last not to have pressure drop, does not have pressure reduction between the grid of CMS1 and the source electrode; The source electrode of CMS1 will break off with drain electrode like this, forbids charging.DC1 can prevent herein the charger reversal connection damage in the circuit during, and can reduce power consumption.

In sum, the lithium battery management system that the utility model proposes can effectively reduce power consumption.The utility model system is that a lithium battery battery bag provides over-charge protective, crosses and put protection, overcurrent protection, short-circuit protection, temperature protection function, and electric quantity display function is provided, little current detecting is forbidden discharging function.Externally have five interface: B+ (total positive pole of power brick), B-(total negative pole of power brick just), C+ (positive pole of charger), P+ (positive pole of load also is the total positive pole that is connected to power brick during discharge), P-/C-(negative pole of load when the negative pole of charger and discharge).Entire circuit took place to put protection, overcurrent protection, short-circuit protection, temperature protection, the situation of not discharging of not charging or when very the arbitrary situation of situation of low discharging current takes place entire circuit to get into resting state.The power consumption that gets into after the dormancy is extremely low, when charger connects after or discharge load connect after or be will wake entire circuit rapidly up after button is pressed, charge or discharge perhaps electric weight demonstration.

Here description of the utility model and application is illustrative, is not to want the scope of the utility model is limited in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation of spirit that does not break away from the utility model or substantive characteristics, and the utility model can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change here to the embodiment that is disclosed.

Claims

1. lithium battery management system; It is characterized in that said system comprises: processor, power module, voltage sample module, big current detecting and control module, little current detecting and control module, short-circuit detecting and control module, over-current detection and control module, button wakes up and detection module, load wake module, electricity quantity display module, temperature detecting module, charger detection module, discharge mouthful inverse electromotive force absorb module, charge switch and a control module thereof; Said processor respectively with power module, voltage sample module, big current detecting and control module, little current detecting and control module, short-circuit detecting and control module, over-current detection and control module, button wakes up and detection module, load wake module, electricity quantity display module, temperature detecting module, charger detection module, discharge mouthful inverse electromotive force absorb a module, charge switch and control module thereof and be connected;

Said load wake module is connected with the P-/C-network, and when P-/C-network level changed from low to high, WAKE UP network produced the low level of a fixed width; When P-/C-network level changes from high to low, the electric weight of the rapid emptying capacitor C 12 of metal-oxide-semiconductor M9 meeting, ready for starting next time.

2. lithium battery management system according to claim 1 is characterized in that:

Said load wake module comprises voltage-stabiliser tube Z3, voltage-stabiliser tube Z4, voltage-stabiliser tube Z5, resistance R 35, resistance R 36, resistance R 37, resistance R 38, metal-oxide-semiconductor M8, metal-oxide-semiconductor M9, capacitor C 12;

3. lithium battery management system according to claim 1 is characterized in that:

Said little current detecting and control module be in order to the little electric current in the detection system, and when electric current during less than set point, big current detecting and control module are closed, and detect size of current by little current detecting and control module.

4. lithium battery management system according to claim 3 is characterized in that:

Said little current detecting and control module comprise resistance R 34, resistance R 43, resistance R 33, resistance R S3, metal-oxide-semiconductor M6, metal-oxide-semiconductor DMS3;

5. lithium battery management system according to claim 1 is characterized in that:

Said power module comprises diode D1, diode D2, triode Q1, voltage-stabiliser tube Z1; Metal-oxide-semiconductor M1, metal-oxide-semiconductor M2, metal-oxide-semiconductor NMOS; Three-terminal voltage-stabilizing power supply U1, resistance R 24, R3, R4, R5, R6, R7, R1, R2, capacitor C 5, C6, C1, C2, C3, C4;

The 1 pin grid of metal-oxide-semiconductor M1 is connected with 1 pin of resistance R 4,1 pin of resistance R 5,1 pin of capacitor C 5 simultaneously; The 3 pin source electrodes of metal-oxide-semiconductor M1 are connected to ground; 2 pin of resistance R 4 are connected to the POWER network; And the POWER network is 12 pin that are connected to processor, and 2 pin of resistance R 5 are connected to ground, and 2 pin of capacitor C 5 are connected to ground;

The 1 pin grid of metal-oxide-semiconductor M2 is connected with 1 pin of resistance R 6,1 pin of resistance R 7,1 pin of capacitor C 6 simultaneously, and the 3 pin source electrodes of metal-oxide-semiconductor M2 are connected to ground, and 2 pin of resistance R 6 are connected to the C+ network, and 2 pin of resistance R 7 are connected to ground, and 2 pin of capacitor C 6 are connected to ground;

The 1 pin source electrode of metal-oxide-semiconductor NMOS, 2 pin source electrodes, 3 pin source electrodes are connected with 1 pin of capacitor C 2, the 2 pin input pins of three-terminal voltage-stabilizing power supply U1 simultaneously; 2 pin of capacitor C 2 are connected to ground; The 1 pin grounding leg of three-terminal voltage-stabilizing power supply U1 is connected to ground; The 3 pin output pins of three-terminal voltage-stabilizing power supply U1 are connected with 1 pin of capacitor C 3,1 pin of capacitor C 4, the network of 5V simultaneously, and 2 pin of capacitor C 3 are connected to ground, and 2 pin of capacitor C 4 are connected to ground.

6. lithium battery management system according to claim 1 is characterized in that:

The voltage sample module comprises metal-oxide-semiconductor M4, metal-oxide-semiconductor M5, resistance R 8, R9, R17, R11, R12, R10, capacitor C 8, C9;

The 1 pin grid of metal-oxide-semiconductor M4 is connected with 2 pin of resistance R 8,1 pin of resistance R 17 simultaneously; 2 pin of resistance R 17 are connected to the 2 pin drain electrode of metal-oxide-semiconductor M5; The 3 pin source electrodes of metal-oxide-semiconductor M5 are connected to ground, and the 1 pin grid of metal-oxide-semiconductor M5 is connected with 1 pin of resistance R 11,1 pin of R12,1 pin of capacitor C 8 simultaneously, and 2 pin of resistance R 11 are connected to the 5V network; 2 pin of resistance R 12 are connected to ground, and 2 pin of capacitor C 8 are connected to ground;

7. lithium battery management system according to claim 1 is characterized in that:

Said big current detecting and control module comprise resistance R 31, R44, R28, R29, R30, R32, RS1, RS2, metal-oxide-semiconductor M7, metal-oxide-semiconductor DMS1, metal-oxide-semiconductor DMS2, triode Q3, triode Q4;

8. lithium battery management system according to claim 1 is characterized in that:

Button wakes up and detection module comprises and often opens button SW1, resistance R 14, R15, capacitor C 15, metal-oxide-semiconductor M10;

9. a lithium battery management system is characterized in that, said system comprises: processor, power module, voltage sample module, load wake module, charger detection module; Said processor is connected with power module, voltage sample module, load wake module, charger detection module respectively;