CN203398772U - Multi-section lithium battery protection system - Google Patents

Multi-section lithium battery protection system Download PDF

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Publication number
CN203398772U
CN203398772U CN201320526534.9U CN201320526534U CN203398772U CN 203398772 U CN203398772 U CN 203398772U CN 201320526534 U CN201320526534 U CN 201320526534U CN 203398772 U CN203398772 U CN 203398772U
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module
lithium battery
pin
resistance
output
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CN201320526534.9U
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江金光
谭高建
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SUZHOU INSTITUTE OF WUHAN UNIVERSITY
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SUZHOU INSTITUTE OF WUHAN UNIVERSITY
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Abstract

The utility model relates to a multi-section lithium battery protection system composed of discrete devices. The multi-section lithium battery protection system comprises an MCU module, an ADC module, an MUX module, an equalization circuit, a current detection module, a temperature detection module, an MOSFET driver and a short-circuit protection module, wherein an output end of the MUX module is connected with an input end of the ADC module, and the voltage, current and temperature information of a lithium battery is transmitted to the ADC module; the MCU module detects data received from the ADC module, judges whether protection operation needs to be carried out for the lithium battery, and the MCU module cuts off a charging/discharging switch or protection through the MOSFET driver according to actual situation when in need; the short-circuit protection module rapidly cuts of a charging/discharging loop upon short circuit of an external circuit; and the MCU module drives the equalization circuit to carry out equalizing operation on the battery in idle state or charging process. The multi-section lithium battery protection system can be used for carrying out the undervoltage, overvoltage, overcurrent, short circuit, temperature protection and the like for the lithium battery pack.

Description

A kind of multisection lithium battery protection system
Technical field
The utility model belongs to lithium battery field of power management, relates to a kind of a kind of multisection lithium battery protection system cheaply simply forming with discrete component.
Background technology
Along with the continuous consumption of fossil energy, people are positive searching new forms of energy, to replace exhaustive fossil energy some day.Along with the development of some unmanned electronics, portable digital equipment, electric tool, electric automobile etc. is universal, its power core---accumulator positive received increasing concern in the last few years.The advantages such as lithium battery is little with its high-energy-density, long circulation life, self discharge, memory-less effect and environmental protection enjoy producer's favor, are one of focuses of electrokinetic cell research.
But due to lithium battery interior complex structure, discharge and recharge chemical reaction complexity, as electrical source of power, use, also there are many problems.Lithium battery can not bear super-charge super-discharge, and when battery series-parallel connection number is more, can go out the new problems such as first battery discharge is unbalanced, must carry out balance charge/discharge management to battery pack.Therefore lithium battery is wanted to work, and be unable to do without monitoring and the protection of lithium battery monitoring management system.Perfect lithium battery monitoring management system, can protect lithium battery not to be burned, to improve lithium battery operating efficiency, extend lithium battery useful life.
Utility model content
The utility model is mainly to solve the existing technical problem of prior art; A kind of lower-cost a kind of multisection lithium battery protection system that can the temperature of lithium battery, voltage, electric current be carried out monitoring in real time and be protected simple in structure is provided.
It is to solve the existing technical problem of prior art that the utility model also has an object; Provide a kind of and can carry out overvoltage, under-voltage, overcurrent, short circuit, outside excess temperature, outside to lithium battery and owe temperature protection, lithium battery has been carried out to charge and discharge balancing processing simultaneously.To guarantee to cut off smoothly charge and discharge switch when lithium battery during in abnormal operating state; or when being short-circuited, circuit cuts off discharge cock; lithium battery is implemented to protection, to reach the working life that extends lithium battery, improve a kind of multisection lithium battery protection system of lithium battery operating efficiency.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:
A kind of multisection lithium battery protection system, it is characterized in that, comprise the parts such as MCU module, ADC module, MUX module, lithium battery group, equalizing circuit, current detection module, temperature detecting module, LDO module, power supply circuits, mosfet driver, short circuit protection module;
Wherein, MCU module is connected with all-purpose computer by serial ports, accepts the necessary configuration of user or reads necessary data for user; MCU module is controlled charge switch and discharge switch by mosfet driver; MCU module controls equalizing circuit carries out equalization operation to lithium battery group; MCU module controls short circuit protection module.Conventionally MCU module, by cutting off charge and discharge switch, is protected lithium battery, also can cut off charging and discharging circuit by short circuit protection module if desired, and lithium battery is protected.MCU module informs that by LED whether user's lithium battery is in normal operating conditions;
Lithium battery group comprises the lithium battery of multi-section serial; Lithium battery group is connected with PACK+ port with short circuit protection module by the current detection module connecting successively; Lithium battery group is connected with PACK-port by discharge switch; PACK+ port is connected external circuit and is external circuit power supply with PACK-port; Discharge switch is serially connected between lithium battery group negative pole and PACK-port, and charge switch is serially connected between lithium battery group negative pole and external charging source negative input CHG_IN-, and external charging source positive input is PACK+ port;
Lithium battery group is connected with MUX module input by equalizing circuit, and the voltage transmission that equalizing circuit saves lithium battery by each is to MUX module; MUX module is connected with the output of current detection module, temperature detecting module, equalizing circuit successively, to receive the state information such as voltage, electric current, temperature of lithium battery; The output channel of MUX module is connected with MCU module by ADC module, and MUX module channels selecting side is subject to MCU module controls; After the battery status information of ADC module converts MUX module output, be transferred to MCU module as the basis for estimation of li-ion cell protection;
The voltage input end of power supply circuits is connected on the common port of current detection module and short circuit protection module, and power supply circuits are also connected with the power input of LDO module, MCU module etc. respectively, are these module for power supply; LDO module, for to be connected with the power end of temperature detecting module, is its low pressure reference voltage for standard.
In above-mentioned a kind of multisection lithium battery protection system, MCU module is usingd 16 single-chip microcomputers as core, comprises necessary accessory circuit, and MCU module controls each operation of li-ion cell protection system.First the MCU module controls MUX different operating state information of gating lithium battery successively, and be transferred to ADC module and change.MCU module receives the data of ADC module converts afterwards, and constantly with preset critical comparison, to judge that whether lithium battery is in normal operating conditions.Once lithium battery is in abnormal operating state, MCU module will be cut off charging by concrete condition, discharge switch is protected lithium battery, and inform user by LED lamp.For judging the whether critical data in normal operating conditions of lithium battery, by all-purpose computer, by serial ports, write.All-purpose computer reads the data such as the lithium battery electric current, voltage, temperature of MCU module stores by serial ports.
In above-mentioned a kind of multisection lithium battery protection system, equalizing circuit adopts conductive discharge method, and the battery higher to voltage carries out equalization operation.Every joint lithium battery conductive discharge branch road that is subject to MCU module controls in parallel all in lithium battery group, when lithium battery group is worked, MCU module is closed discharge paths; When lithium battery is in free time or rechargable battery, when if MCU module detects certain batteries overtension, open corresponding discharge paths, to consume the voltage of this batteries electric quantity balancing lithium battery group, that is: every joint lithium battery Bn all in parallel one by discharge resistance RBn, the branch road of connecting with N-type switch MOS pipe Qn, the source electrode of N-type switch MOS pipe Qn is connected with lithium battery Bn negative pole, the drain electrode of N-type switch MOS pipe Qn is connected by resistance R Bn and lithium battery Bn are anodal, and the grid of N-type switch MOS pipe Qn is connected with the output of either-or switch MUX2n by resistance R Gn; Lithium battery Bn positive pole and negative pole are respectively by current-limiting resistance RFn, RFn-1 access MUX module; The positive pole of lithium battery Bn is received in filter capacitor CBn one end by resistance R Fn, the other end is received the negative pole of lithium battery Bn by resistance R Fn-1; Either-or switch MUX2n is subject to the control of MCU module, an input is connected to the positive pole of lithium battery by resistance R Fn, another input is connected to the negative pole of lithium battery by resistance R Fn-1, the output of MUX2n is also connected to the common port of resistance R Fn-1 and MUX module by resistance R Tn; When MUX2n gating anode, the conducting of Qn pipe starts this batteries to carry out equalization operation; When MUX2n gating battery cathode, stop the equalization operation to this batteries.
In above-mentioned a kind of multisection lithium battery protection system, MCU module need to be controlled charge and discharge switch by mosfet driver, the PD pin of MCU module is controlled the DSG output pin of mosfet driver, when the DSG pin of mosfet driver connects discharge switch control end DSG pin output high level, open discharge switch, during output low level, cut off discharge switch; The defeated co-controlling charge switch of mosfet driver VH pin and CHG pin, opens charge switch when VH pin output high level and CHG pin output constant current, cut off charge switch when VH pin output low level and CHG pin output high-impedance state.
In above-mentioned a kind of multisection lithium battery protection system, the PD pin of MCU module is controlled the DSG output pin of mosfet driver, and the PC pin of MCU module is controlled output pin VH and the CHG of mosfet driver.PD pin connects the grid of N-type switch MOS pipe M3 by resistance R 8, the grid of N-type switch MOS pipe M3 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M3 by resistance R 9; The drain electrode of N-type switch MOS pipe M3 is pin DSG, and the drain electrode of N-type switch MOS pipe M3 connects PACK+ port by resistance R 10 after being connected with the negative pole of voltage stabilizing didoe D4, and the positive pole of diode D4 connects PACK-port.When PD pin output high level, resistance R 8, R9 dividing potential drop M3 conducting, DSG pin output low level; When the PD of MCU module pin output low level, M3 disconnects, and pressure stabilization function is played in D4 conducting, the high level of DSG output 12V.PC pin connects the grid of N-type switch MOS pipe M2 by resistance R 6, the grid of N-type switch MOS pipe M2 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M2 by resistance R 7; The drain electrode of N-type switch MOS pipe M2 is pin VH, and the drain electrode of N-type switch MOS pipe M2 connects PACK+ port by resistance R 10 after being connected with the negative pole of voltage stabilizing didoe D5, and the positive pole of diode D5 connects PACK-port; The source electrode of metal-oxide-semiconductor M4 connects PACK-port after being connected with the source electrode of metal-oxide-semiconductor M5, and the grid of metal-oxide-semiconductor M4 connects the drain electrode of metal-oxide-semiconductor M4 after being extremely connected with the grid of metal-oxide-semiconductor M5, and the drain electrode of metal-oxide-semiconductor M4 is received VH by resistance R 12, and the drain electrode of metal-oxide-semiconductor M5 is CHG pin.When PC pin output high level, resistance R 6, R7 dividing potential drop M2 conducting, VH pin output low level, metal-oxide-semiconductor M4, M5 cut-off CHG pin output high-impedance state; When the PC of MCU module pin output low level, M2 cut-off D5 conducting, the high level of VH output 12V, metal-oxide-semiconductor M4, M5 conducting CHG output 5uA electric current.
In above-mentioned a kind of multisection lithium battery protection system, current detection module adopts nominal resistance RS two ends pressure drop to indicate lithium battery working temperature, and resistance R S is serially connected between lithium battery group positive pole and PACK+, both end voltage access MUX module; Temperature detecting module adopts the pressure drop of thermistor RT to represent battery temperature; Thermistor RT one end is connected with the output of LDO module, and the other end connects PACK-port after connecting with nominal resistance RB, the public termination MUX module of resistance R T and resistance R B; The voltage input end of LDO module connects power supply circuits output, the input termination PACK+ port of power supply circuits.
In above-mentioned a kind of multisection lithium battery protection system, short circuit protection module comprises that one end connects the controlled switch F1 of PACK+ port, the other end of controlled switch F1 is connected by temperature detecting module and lithium battery group are anodal, when electric current is excessive in circuit, can directly fuse to protect lithium battery, controlled switch F1 is subject to MCU module controls, connects as follows: the controlled end of controlled switch F1 is connected with the drain electrode of N-type switch MOS pipe M6; The anode of diode D6 is connected with N-type switch MOS pipe M6 source electrode, and negative terminal is connected with the drain electrode of N-type switch MOS pipe M6; N-type switch MOS pipe M6 source electrode connects PACK-port by capacitor C 2, and the grid of N-type switch MOS pipe M6 connects the PF output of MCU module, and PF port connects PACK-port by resistance R 13.While there is short-circuit conditions in circuit, the excessive direct fusing of electric current on F1, without the judgement of MCU module, can realize the short-circuit protection to circuit so fast.MCU module is controlled the work of protection tube F1 by metal-oxide-semiconductor, its objective is when the charge and discharge switch of system damages, and can stop discharging and recharging of battery by F1, realizes the reliably protecting to lithium battery.
Whole system is powered by lithium battery group, and voltage when single-lithium-battery pond electric weight is 0% is 3.0V, and in order to meet the demand of the demand of system modules, especially mosfet driver and charge and discharge switch, lithium battery group comprises the lithium battery of at least 4 joint series connection.
Therefore, the utlity model has following advantage: 1. simple in structurely lower-costly can carry out monitoring in real time and protection to the temperature of lithium battery, voltage, electric current; 2. can carry out overvoltage, under-voltage, overcurrent, short circuit, outside excess temperature, outside to lithium battery and owe temperature protection, lithium battery be carried out to charge and discharge balancing processing simultaneously.To guarantee to cut off smoothly charge and discharge switch when lithium battery during in abnormal operating state, or circuit cuts off discharge cock while being short-circuited, and lithium battery is implemented to protection, to reach the working life that extends lithium battery, and raising lithium battery operating efficiency.
Accompanying drawing explanation
Figure 1 shows that overall plan schematic diagram of the present utility model.
Figure 2 shows that the circuit diagram of system n batteries Bn equalizing circuit.
Figure 3 shows that the circuit diagram of system mosfet driver.
Figure 4 shows that the circuit diagram of system discharge switch.
Figure 5 shows that the circuit diagram of system charge switch.
Figure 6 shows that the circuit diagram of system power detection module.
Figure 7 shows that the circuit diagram of system overcurrent protection module.
Figure 8 shows that the schematic diagram of system temperature detection module.
Figure 9 shows that working-flow schematic diagram.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment:
Figure 2 shows that the circuit diagram of n batteries and equalizing circuit thereof, adopt conductive discharge method to carry out equalization operation to lithium battery group.Every joint lithium battery Bn all in parallel one by discharge resistance RBn, the branch road of connecting with N-type switch MOS pipe Qn, the source electrode of N-type switch MOS pipe Qn is connected with lithium battery Bn negative pole, the drain electrode of N-type switch MOS pipe Qn is connected by resistance R Bn and lithium battery Bn are anodal, and the grid of N-type switch MOS pipe Qn is connected with the output of either-or switch MUX2n by resistance R Gn; Lithium battery Bn positive pole and negative pole are respectively by current-limiting resistance RFn, RFn-1 access MUX module; The positive pole of lithium battery Bn is received in filter capacitor CBn one end by resistance R Fn, the other end is received the negative pole of lithium battery Bn by resistance R Fn-1; Either-or switch MUX2n is subject to the control of MCU module, an input is connected to the positive pole of lithium battery by resistance R Fn, an input is connected to the negative pole of lithium battery by resistance R Fn-1, the output of MUX2n is also connected to the common port of resistance R Fn-1 and MUX module by resistance R Tn.(turn certainly: utility model content).When lithium cell charging or free time, when MCU module detects n batteries Bn overtension, it is anodal that MCU controls either-or switch MUX2n gating Bn, resistance R Fn, RTn, RFn-1 form bleeder circuit Qn conducting, start Bn to carry out equalization discharge processing, because resistance R Bn is small resistor with respect to resistance R Fn, RTn, RFn-1, so the electric current of equalization operation can be set by RBn.If MCU module controls MUXn gating Bn negative pole is disconnected Qn while not needing equilibrium, Bn does not have balanced loop can not produce balanced action.Current-limiting resistance RFn, RFn-1 are limiting the electric current that flows into ADC module, and battery pack is composed in series by multisection lithium battery, after each equalizing circuit that saves lithium battery connects by the series relationship of lithium battery, have just formed the equalizing circuit of lithium battery group.Above-mentioned processing is consistent the voltage of every batteries in lithium battery group substantially, to reach the object of balanced operation, can improve like this operating efficiency of battery pack, the useful life of prolongation battery.
Figure 3 shows that the circuit diagram of system mosfet driver: the PD pin of MCU module is controlled the DSG output pin of mosfet driver, the PC pin of MCU module is controlled output pin VH and the CHG of mosfet driver.PD pin connects the grid of N-type switch MOS pipe M3 by resistance R 8, the grid of N-type switch MOS pipe M3 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M3 by resistance R 9; The drain electrode of N-type switch MOS pipe M3 is pin DSG, and the drain electrode of N-type switch MOS pipe M3 connects PACK+ port by resistance R 10 after being connected with the negative pole of voltage stabilizing didoe D4, and the positive pole of diode D4 connects PACK-port.When PD pin output high level, resistance R 8, R9 dividing potential drop M3 conducting, DSG pin output low level; When the PD of MCU module pin output low level, M3 disconnects, and pressure stabilization function is played in D4 conducting, the high level of DSG output 12V.PC pin connects the grid of N-type switch MOS pipe M2 by resistance R 6, the grid of N-type switch MOS pipe M2 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M2 by resistance R 7; The drain electrode of N-type switch MOS pipe M2 is pin VH, and the drain electrode of N-type switch MOS pipe M2 connects PACK+ port by resistance R 10 after being connected with the negative pole of voltage stabilizing didoe D5, and the positive pole of diode D5 connects PACK-port; The source electrode of metal-oxide-semiconductor M4 connects PACK-port after being connected with the source electrode of metal-oxide-semiconductor M5, and the grid of metal-oxide-semiconductor M4 connects the drain electrode of metal-oxide-semiconductor M4 after being extremely connected with the grid of metal-oxide-semiconductor M5, and the drain electrode of metal-oxide-semiconductor M4 is received VH by resistance R 12, and the drain electrode of metal-oxide-semiconductor M5 is CHG pin.When PC pin output high level, resistance R 6, R7 dividing potential drop M2 conducting, VH pin output low level, metal-oxide-semiconductor M4, M5 cut-off CHG pin output high-impedance state; When the PC of MCU module pin output low level, M2 cut-off D5 conducting, the high level of VH output 12V, metal-oxide-semiconductor M4, M5 conducting CHG output 5uA electric current.
Figure 4 shows that system discharge switching circuit figure, discharge switch is comprised of MOSFET, voltage stabilizing didoe and more peripheral resistance and electric capacity.When needs lithium battery is powered to external world, MCU module PD pin output low level, controls the DSG pin of mosfet driver and exports 12V high level, now MDSG1 conducting, and system enters the outside circuit supply of discharge condition.When energy content of battery output is complete or when not normal state can not discharge, MCU module PD pin output high level, controls the DSG pin output low level of mosfet driver, and MDSG1 closes and lithium battery stops electric discharge.
Figure 5 shows that system charge switch circuit figure, charge switch is comprised of in conjunction with more peripheral resistance, electric capacity and voltage stabilizing didoe a plurality of MOSFET.When access charge power supply and battery electric quantity deficiency, the PC pin output low level of MCU module, control the electric current of the CHG pin output 5uA of mosfet driver, VH pin output 12V high level, R2 and R3 carry out dividing potential drop to VH output voltage and open M1, M1 output current is by R4 to opening MCHG1, and now external power source is to lithium cell charging; When reaching battery and be full of, the PC pin of MCU module output high level, controls CHG pin output high-impedance state, VH pin output low level simultaneously, and M1 and MCHG1 disconnect charging to be stopped.
Figure 6 shows that system power detection module circuit diagram, adopt a nominal resistance to measure electric current, by these resistance two side pressures, will indicate the operating current of battery pack, can obtain the operating current I=(VS of lithium battery +-VS -)/RS, the minimum system works that do not affect of resistance R S resistance.MCU module, by the critical numerical value comparison of the difference of VS+ and VS-and current protection, to judge whether carrying out current protection to battery, is if desired cut off charge and discharge switch, to reach the object of protection.
Figure 7 shows that system short-circuit protection module circuit diagram, short circuit protection module is comprised of controlled switch F1, MOSFET and peripheral resistance and electric capacity.The controlled end of controlled switch F1 is connected with the drain electrode of N-type switch MOS pipe M6; The anode of diode D6 is connected with N-type switch MOS pipe M6 source electrode, and negative terminal is connected with the drain electrode of N-type switch MOS pipe M6; N-type switch MOS pipe M6 source electrode connects PACK-port by capacitor C 2, and the grid of N-type switch MOS pipe M6 connects the PF output of MCU module, and PF port connects PACK-port by resistance R 13.While there is short-circuit conditions in circuit, the excessive direct fusing of electric current on F1, without the judgement of MCU module, can realize the short-circuit protection to circuit so fast.MCU module is controlled the work of protection tube F1 by metal-oxide-semiconductor, its objective is when the charge and discharge switch of system damages, and can stop discharging and recharging of battery by F1, realizes the reliably protecting to lithium battery.
Figure 8 shows that system temperature detection module circuit diagram; outside temperature has determined the resistance of thermistor RT, and RB to be nominal resistance have a fixing value, both form bleeder circuit; adopt the voltage on RT to indicate the residing temperature of outside batteries, RB plays the effect of protection RT simultaneously.LDO module is comprised of separated LDO chip, for bleeder circuit provides stable normal voltage, with the temperature of correct sign outside.MCU, by the voltage on RB and the comparison of temperature protection critical value, to determine whether need temperature protection, while if desired carrying out temperature protection, cuts off charge and discharge switch lithium battery is protected.
In addition, in the present embodiment, MUX module is a multichannel selector, and gating end is subject to MCU module controls, and ADC module core is 16 ADC chips of a single channel, can change fast the data of MUX module output.
System shown in Figure 9 operational process schematic diagram, specific explanations is as follows:
(1) chip initiation: comprise the initialization of the initialization of ADC chip, MCU, LDO chip initiation, wait the initialization of adopted discrete device; MCU module is normal operating conditions by default simultaneously.
(2) lithium battery abnormal operating state judgement: the status data that MCU module detects lithium battery is voltage, electric current, temperature etc.; in these data, some surpasses preset critical; when the duration surpasses corresponding time of delay simultaneously; MCU judgement lithium battery, in abnormal operating state, need to take measures lithium battery to protect.
(3) under-voltage overvoltage protection: when lithium battery forces down in under-voltage detection critical value, and duration while surpassing under-voltage detection time delay, MCU judgement lithium battery enters under-voltage condition and can not continue outside circuit discharging, now cuts off discharge switch with protection lithium battery; When forcing down in overvoltage, lithium battery detects critical value, and duration when surpassing overvoltage and detecting time delay, MCU judgement lithium battery enters overvoltage condition and can not continue charging, now cuts off charge switch with protection lithium battery.
(4) temperature protection: when lithium battery temperature of living in is beyond normal working temperature critical range; and the duration is while surpassing temperature detection time delay; MCU judgement lithium battery enters high temperature or low-temperature condition; now lithium battery can not continue to discharge and recharge again; need to cut off charge and discharge switch, to protect battery not damaged.
(5) overcurrent, short-circuit protection: when the operating current of lithium battery surpasses rated current, and the duration is when current detecting is on the time; MCU judgement lithium battery enters over-current state; now lithium battery can not continue to discharge and recharge again, need to cut off charge and discharge switch, to protect battery.When circuit is short-circuited, now electric current is larger, and the insurance F1 that can directly fuse in short-circuit protection, to protect lithium battery; Now MCU module possibly cannot judge and cut off charge and discharge switch fast, is therefore necessary to add this module.
(6) equalization operation: equalization operation needs the setting operation cycle, each cycle judgement once which battery needs equalization operation, switches corresponding MUX passage and connect equalizing circuit while needing, and carries out equalization operation, disconnects equalizing circuit while not needing, and stops equalization operation.
(7) recover normal condition: when system is taked after safeguard measure lithium battery, can pass through LED reminding user.Simultaneously MCU module continues to detect lithium battery status, when the recovering state of lithium battery is normal, opens charge and discharge switch protection and makes system return to normal condition.
The power supply circuits of MCU module and LDO module are by a decompression voltage regulator, and being used for provides stable working power for the chip in MCU module and LDO module; In system, certain module need to be used voltage more than 12V, and this just requires total input voltage of lithium battery group can not be lower than 12V, otherwise system cannot realize normal function.Voltage when the single-lithium-battery pond electric weight of protecting is 0% is 3V, in battery pack, at least needs the above lithium battery series connection of 4 joint.The maximum voltage that voltage when lithium battery is full of electric weight and power supply circuits can bear, has determined in battery pack, multipotency comprises how many batteries.In order to guarantee the reliability service of system, native system is set protection 5-10 joint lithium battery.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Claims (6)

1. a multisection lithium battery protection system, it is characterized in that, comprise MCU module, ADC module, MUX module, lithium battery group, equalizing circuit, current detection module, temperature detecting module, LDO module, power supply circuits, mosfet driver, short circuit protection module;
Wherein, MCU module is connected with all-purpose computer by serial ports, accepts the necessary configuration of user or supplies user's reading out data; MCU module is controlled charge switch and discharge switch by mosfet driver; MCU module controls equalizing circuit carries out equalization operation to lithium battery group; MCU module controls short circuit protection module; MCU module, by cutting off charge and discharge switch, is protected lithium battery, also can cut off charging and discharging circuit by short circuit protection module if desired, and lithium battery is protected; MCU module informs that by LED whether user's lithium battery is in normal operating conditions;
Lithium battery group comprises the lithium battery series connection of some multi-section serials; Lithium battery group is connected with PACK+ port with short circuit protection module by the current detection module connecting successively; Lithium battery group is connected with PACK-port by discharge switch; PACK+ port is connected external circuit and is external circuit power supply with PACK-port; MCU module controls equalizing circuit carries out equalization operation to lithium battery group; MCU module controls short circuit protection module, conventionally MCU module is by cutting off charge and discharge switch, lithium battery is protected, also can cut off charging and discharging circuit by short circuit protection module if desired, lithium battery is protected, and MCU module informs that by LED whether user's lithium battery is in normal operating conditions;
Lithium battery group is connected with MUX module input by equalizing circuit, and the voltage transmission that equalizing circuit saves lithium battery by each is to MUX module; MUX module is connected with the output of current detection module, temperature detecting module, equalizing circuit successively, to receive voltage, electric current, the state of temperature information of lithium battery; The output channel of MUX module is connected with MCU module by ADC module, and MUX module channels selecting side is subject to MCU module controls; After the battery status information of ADC module converts MUX module output, be transferred to MCU module as the basis for estimation of li-ion cell protection;
The voltage input end of power supply circuits is connected on the common port of current detection module and short circuit protection module, and power supply circuits are also connected with the power input of LDO module, MCU module etc. respectively, are these module for power supply; LDO module, for to be connected with the power end of temperature detecting module, is its low pressure reference voltage for standard.
2. according to a kind of multisection lithium battery protection system described in claim 1, it is characterized in that: equalizing circuit adopts conductive discharge method, and the battery higher to voltage carries out equalization operation; N joint lithium battery Bn all in parallel one by discharge resistance RBn, the branch road of connecting with N-type switch MOS pipe Qn, the source electrode of N-type switch MOS pipe Qn is connected with lithium battery Bn negative pole, the drain electrode of N-type switch MOS pipe Qn is connected by resistance R Bn and lithium battery Bn are anodal, the grid of N-type switch MOS pipe Qn is connected with the output of either-or switch MUX2n by resistance R Gn, and lithium battery Bn positive pole and negative pole are respectively by current-limiting resistance RFn, RFn-1 access MUX module; The positive pole of lithium battery Bn is received in filter capacitor CBn one end by resistance R Fn, the other end is received the negative pole of lithium battery Bn by resistance R Fn-1; Either-or switch MUX2n is subject to the control of MCU module, an input is connected to the positive pole of lithium battery by resistance R Fn, an input is connected to the negative pole of lithium battery by resistance R Fn-1, the output of MUX2n is also connected to the common port of resistance R Fn-1 and MUX module by resistance R Tn; Either-or switch MUX2n is subject to the control of MCU module, and during elected logical anode, the conducting of Qn pipe starts this batteries to carry out equalization operation; During elected logical battery cathode, stop the equalization operation to this batteries.
3. according to a kind of multisection lithium battery protection system described in claim 2, it is characterized in that: MCU module is by mosfet driver charge and discharge switch, the PD pin of MCU module is controlled the DSG output pin of mosfet driver, the DSG pin of mosfet driver connects discharge switch control end, when PD pin is output low level, DSG pin output high level is to open discharge switch; When PD pin output high level, DSG pin output low level is to cut off discharge switch; The PC pin of MCU module is controlled VH and the CHG output pin of mosfet driver, the defeated co-controlling charge switch of VH and CHG output pin, and when PC pin output low level, VH pin output high level and CHG pin output constant current are to open charge switch; When PC pin output low level, VH pin output low level and CHG pin output high-impedance state are to cut off charge switch.
4. according to a kind of multisection lithium battery protection system described in claim 3, it is characterized in that: the PD pin of MCU module is controlled the DSG output pin of mosfet driver, the PC pin of MCU module is controlled output pin VH and the CHG of mosfet driver; PD pin connects the grid of N-type switch MOS pipe M3 by resistance R 8, the grid of N-type switch MOS pipe M3 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M3 by resistance R 9; The drain electrode of N-type switch MOS pipe M3 is pin DSG, after the drain electrode of N-type switch MOS pipe M3 is connected with the negative pole of voltage stabilizing didoe D4, by resistance R 10, connect PACK+ port, the positive pole of diode D4 connects PACK-port, DSG pin output low level during PD pin output high level, DSG pin output high level during PD pin output low level; PC pin connects the grid of N-type switch MOS pipe M2 by resistance R 6, the grid of N-type switch MOS pipe M2 connects PACK-port after being connected with the source electrode of N-type switch MOS pipe M2 by resistance R 7; The drain electrode of N-type switch MOS pipe M2 is pin VH, and the drain electrode of N-type switch MOS pipe M2 connects PACK+ port by resistance R 10 after being connected with the negative pole of voltage stabilizing didoe D5, and the positive pole of diode D5 connects PACK-port; The source electrode of metal-oxide-semiconductor M4 connects PACK-port after being connected with the source electrode of metal-oxide-semiconductor M5, and the grid of metal-oxide-semiconductor M4 connects the drain electrode of metal-oxide-semiconductor M4 after being extremely connected with the grid of metal-oxide-semiconductor M5, and the drain electrode of metal-oxide-semiconductor M4 is received VH by resistance R 12, and the drain electrode of metal-oxide-semiconductor M5 is CHG pin; VH pin output high level when PC pin output high level, CHG pin output high-impedance state; CHG pin output constant current during PC pin output low level, VH pin output high level.
5. according to a kind of multisection lithium battery protection system described in claim 4, it is characterized in that: current detection module adopts nominal resistance RS two ends pressure drop to indicate lithium battery working temperature, resistance R S is serially connected between lithium battery group positive pole and PACK+, both end voltage access MUX module; Temperature detecting module adopts the pressure drop of thermistor RT to represent battery temperature; Thermistor RT one end is connected with the output of LDO module, and the other end connects PACK-port after connecting with nominal resistance RB, the public termination MUX module of resistance R T and resistance R B; The voltage input end of LDO module connects power supply circuits output, the input termination PACK+ port of power supply circuits.
6. according to a kind of multisection lithium battery protection system described in claim 5, it is characterized in that: short circuit protection module comprises the controlled switch F1 of a termination PACK+ port, the other end of controlled switch F1 is connected when electric current is excessive in circuit and can directly fuses by temperature detecting module and lithium battery group are anodal, to protect lithium battery; Controlled switch F1 is also subject to MCU module controls, connects as follows: the controlled end of controlled switch F1 is connected with the drain electrode of N-type switch MOS pipe M6; The anode of diode D6 is connected with N-type switch MOS pipe M6 source electrode, and negative terminal is connected with the drain electrode of N-type switch MOS pipe M6; N-type switch MOS pipe M6 source electrode connects PACK-port by capacitor C 2, and the grid of N-type switch MOS pipe M6 connects the PF output of MCU module, and PF port connects PACK-port by resistance R 13, during PF output high level, fuses F1 with protection lithium battery.
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