CN206313488U - A kind of lithium battery safety management system - Google Patents
A kind of lithium battery safety management system Download PDFInfo
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- CN206313488U CN206313488U CN201621435248.1U CN201621435248U CN206313488U CN 206313488 U CN206313488 U CN 206313488U CN 201621435248 U CN201621435248 U CN 201621435248U CN 206313488 U CN206313488 U CN 206313488U
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Abstract
The utility model discloses a kind of lithium battery safety management system, including：Control administrative unit；The first gate-controlled switch, the second gate-controlled switch and the 3rd gate-controlled switch being sequentially connected in series；First current sample and the second current sample；First gate-controlled switch one terminates charging end positive pole, and the other end is connected to the positive pole of battery pack through the second gate-controlled switch；The control administrative unit connects the control end of the first gate-controlled switch and the second gate-controlled switch respectively；3rd gate-controlled switch one terminates battery anode, and used as discharge end positive pole, the connection of its control end controls administrative unit to the other end；First current sample is serially connected between charging end negative pole and battery electrode；Second current sample is serially connected between discharge end negative pole and battery electrode.Lithium battery safety management system described in the utility model, can carry out safety management to battery pack, extend lithium battery service life, reduce battery failure risk, substantially reduce battery set charge/discharge chance of runaway, it is to avoid security incident occur.
Description
Technical field
The utility model is related to dynamic lithium battery discharge and recharge safety management field, more particularly to a kind of lithium battery bursting tube
Reason system.
Background technology
Dynamic lithium battery has the advantages that energy density is big, power density is high, therefore electric automobile, electric tool, emergent
The large power-consuming equipments such as startup power supply are mostly using dynamic lithium battery as energy source.But the intrinsic security of dynamic lithium battery
Problem never has and is effectively solved, and lithium battery is overcharged, mistake is put, temperature control, cell voltage are inconsistent etc. can all influence
Battery, will occur when serious battery bulge, catch fire, the even security incident such as blast, jeopardize personal safety as well as the property safety.
Existing lithium battery management system has certain safety protection function, but its protection and failure management to battery
Consider not comprehensive enough, only with simple charge and discharge control function, and only there is first class of protection, reliability is relatively low, failure probability
It is larger, still can often catch fire, explode, it is impossible to meet the safe handling of electrical equipment, market is difficult to receive, it is necessary to improve.
Utility model content
The utility model is mainly solving the technical problems that provide a kind of lithium battery safety management system, lifting lithium battery fills
Electricity and the multi-stage protection of electric discharge, reliability and safety in utilization when improving lithium battery as large power-consuming equipment energy source.
In order to solve the above technical problems, the technical scheme that the utility model is used is：A kind of lithium battery safety is provided
Management system, including：
Control administrative unit；
The first gate-controlled switch, the second gate-controlled switch and the 3rd gate-controlled switch being sequentially connected in series；
First current sample and the second current sample；
First gate-controlled switch one terminates charging end positive pole, and the other end is being connected to battery pack just through the second gate-controlled switch
Pole, constitutes charging two class protection structure；
The control administrative unit connects the control end of the first gate-controlled switch and the second gate-controlled switch respectively, so as to control the
One gate-controlled switch and the second gate-controlled switch are switched on or off；
3rd gate-controlled switch one terminates battery anode, and the other end used as discharge end positive pole, control by the connection of its control end
Administrative unit processed；
First current sample is serially connected between charging end negative pole and battery electrode, simultaneously anti-for gathering charging current
Feed control administrative unit；
Second current sample is serially connected between discharge end negative pole and battery electrode, simultaneously anti-for gathering discharge current
Feed control administrative unit；
The battery pack is made up of the lithium battery group of at least 2 strings, every a string of the battery pack multisection lithium battery connection in series-parallel
Between be also equipped with attemperating unit and battery pack heating given when temperature is too low.
In one preferred embodiment of the utility model, the control administrative unit includes：
Controller；
Positive temperature coefficient can recover thermistor F1, be connected to charging end P1, charging end P1 connection external chargers, normal temperature
Under, positive temperature coefficient can recover thermistor F1 for low resistance state, keep charging normal；When charging current is more than setting value, just
Temperature coefficient can recover the rising of thermistor F1 temperature, be changed into high-impedance state, disconnect charge circuit, form charging excessively stream hardware package
Shield；
Charging signals observation circuit, including：Resistance R101, resistance R102 and triode Q101, resistance R101, resistance R102
Triode Q101 will be sent into after charger voltage partial pressure, when external charger is accessed, IN_CHG ports produce interrupt signal to call out
Awake controller, controller judges whether to meet charge condition, performs next step action；
Electric voltage observation circuit, including：Resistance R104, resistance R105, electric capacity C102 and diode D101, resistance R104, electricity
Resistance R105 will send into electric capacity C102 and diode D101 and controller AD_CHG ports after charger voltage partial pressure, work as charger
In normal range (NR), controller opens the second gate-controlled switch, i.e. metal-oxide-semiconductor Q104 to voltage, and otherwise Q104 is off；
Second gate-controlled switch drive circuit, including resistance R109, resistance R110, resistance R111 and triode Q105, resistance
R109, resistance R110 and triode Q105 are connected between the source electrode of metal-oxide-semiconductor Q104 and battery electrode interface, and resistance R111 connects
It is connected between the base stage of triode Q105 and control end EN_CHG2, controlled terminal EN_CHG2 controls, as charging first class of protection
Mechanism；
Similarly, resistance R106, resistance R107, resistance R108 and triode Q103 constitute the first gate-controlled switch drive circuit,
First gate-controlled switch is metal-oxide-semiconductor Q102, controlled terminal EN_CHG1 controls, as charging second class protection mechanism；
Metal-oxide-semiconductor Q102, metal-oxide-semiconductor Q104 form the protection mechanism of plural serial stage, are only just formed when both opening and filled
Electrical circuit.
In one preferred embodiment of the utility model, first current sample includes sampling resistor RS1, resistance R103
It is connected between battery electrode and charging end negative pole with electric capacity C101, resistance R103 and electric capacity C101, sampling resistor RS1 two ends
Charging end negative pole and battery electrode are connected respectively, for gathering charge circuit electric current and feeding back to control by FB_CHG ports
Device, monitoring control devices charging current, once exceed normal value, will be by EN_CHG2 port shutdown metal-oxide-semiconductor Q104, shape
Into charging excessively stream software protection.
In one preferred embodiment of the utility model, the lithium battery safety management system is also protected including battery pack one-level
Protection circuit, the battery pack first class of protection circuit includes battery equalizing circuit and battery voltage acquisition circuit.
In one preferred embodiment of the utility model, the battery equalizing circuit includes several resistance energy consuming circuitries, uses
In the voltage of attrition voltage that a string of battery packs higher, maintain each string battery voltage equal, the resistance energy consuming circuitry point
Controller and corresponding a string of batteries two ends are not connected to, and the resistance energy consuming circuitry includes the first energy consumption resistor, power consumption respectively
Circuit triode, optocoupler, the second energy consumption resistor and the 3rd energy consumption resistor, first energy consumption resistor and energy consuming circuitry triode string
Corresponding a string of batteries two ends are associated in, the optocoupler, the second energy consumption resistor are also connected on corresponding a string of batteries two ends, power consumption electricity
The base stage of road triode is connected between optocoupler and the second energy consumption resistor, and the 3rd energy consumption resistor is connected on the control end of optocoupler
And the control end of controller between.
In one preferred embodiment of the utility model, the battery voltage acquisition circuit respectively include control triode,
Voltage acquisition triode, first voltage collection resistance and a RC filter circuits, the voltage acquisition triode, first voltage are adopted
Collection resistance and a RC filter circuits be connected between the positive pole of every a string of battery packs and ground wire, a RC filter circuits with control
The AD ports of device processed are connected, and for gathering a string of voltages of battery pack of correspondence, the base stage of voltage acquisition triode is also gone here and there respectively
Second voltage collection resistance is associated with, is connected with control triode after several second voltage collection resistor coupled in parallel, the control three
The base stage of pole pipe is provided with tertiary voltage collection resistance, and the tertiary voltage collection resistance is connected with the EN_ADC ports of controller
Connect, controller controls the on or off of triode by EN_ADC Port Managements, when management system meets sleep condition, control
Device shut-off control triode processed, so that voltage acquisition triode is also turned off, voltage acquisition passage is closed, and further reduces system
Power consumption, extends battery pack storage time.
In one preferred embodiment of the utility model, the lithium battery safety management system also includes two grades of guarantors of battery pack
Protection circuit, the battery pack safe secondary protection circuit includes：
Battery protection chip；
2nd RC filter circuits, every a string of battery voltages are connected to battery protection core by the 2nd RC filter circuits respectively
The VCX pins of piece, the VDD pins that the total positive pole of battery pack is also connected to battery protection chip by a 2nd RC filter circuit enter
Row power supply, untapped voltage monitoring pin ground connection；
Resistance R305 and triode Q301, resistance R305 are connected on triode Q301 and battery protection chip output pin CO
Between, triode Q301 collector outputs EN_CHG1 controls the on or off of the first gate-controlled switch, while output end EN_
CHG1 is also connected on the input port of controller, the output state for informing controller EN_CHG1 ports；
When battery protection chip detect it is any string battery voltage it is too high when, output end CO output high level, triode
Q301 is turned on, and port EN_CHG1 is pulled low, and triode Q103 disconnects, and metal-oxide-semiconductor Q102 also disconnects therewith, and charge circuit is closed, and is kept away
Exempt from battery pack to occur overcharging, constitute battery voltage second class protection, meanwhile, EN_CHG1 ports cut-off signals also send into controller,
Further be also switched off for metal-oxide-semiconductor Q104 by controller, it is ensured that metal-oxide-semiconductor Q102, Q104 are all in off state, it is to avoid safe thing occurs
Therefore.
In one preferred embodiment of the utility model, the battery voltage acquisition circuit and battery pack safe secondary protection circuit
Also there is breaking protection function；When battery voltage acquisition circuit or battery pack safe secondary protection circuit do not collect battery voltage
When, the first gate-controlled switch, the second gate-controlled switch and the 3rd gate-controlled switch will be closed, forbid battery pack charge or discharge.
In one preferred embodiment of the utility model, the lithium battery safety management system also includes temperature acquisition electricity
Road, the temperature collection circuit includes resistance R401 and thermistor RT4, is accessed after resistance R401 and thermistor RT4 partial pressures
Controller AD_TSN ports, thermistor RT4 is placed in internal battery pack, real-time monitoring battery pack temperature, when temperature is beyond normal
During charge or discharge temperature, controller closes charging and discharging circuit, forbids battery pack discharge and recharge at too high or too low temperature.
In one preferred embodiment of the utility model, the attemperating unit includes：
Resistance R307, resistance R307 are banding or thread resistance, uniform and be close to every a string of the battery packs of winding；
Switch SW3, switch SW3 are open type temperature detect switch (TDS), are attached to the surface of resistance R307；
Metal-oxide-semiconductor Q302, resistance R307 are connected between the total positive pole of battery pack and metal-oxide-semiconductor Q302, and switch SW3 is connected to MOS
Between pipe Q302 grids and ground wire, metal-oxide-semiconductor source ground；
Resistance R306, is connected between metal-oxide-semiconductor Q302 grids and the EN_HEAT ports of controller；
When battery pack carries out charge or discharge at a lower temperature, before this, controller is beaten by EN_HEAT ports
Metal-oxide-semiconductor Q302 is opened, resistance R307 heatings transfer heat to battery pack by way of heat transfer, and battery pack temperature is raised, when
When controller AD_TSN Port detectings reach the requirement of charge or discharge to battery temperature, metal-oxide-semiconductor Q302 is closed, stop heating；
Switch SW3 automatically switches to closure state when heating-up temperature is detected more than certain numerical value, is disconnected by hardware
Metal-oxide-semiconductor Q302, increased 1 grade of temperature control protection, improve the reliability of attemperating unit.
In one preferred embodiment of the utility model, the lithium battery safety management system also includes that buzzer drives electricity
Road, the buzzer drive circuit includes resistance R402, resistance R403, triode Q401 and buzzer B4, the resistance R402
It is connected with controller, the resistance R402, triode Q401, resistance R403 and buzzer B4 are sequentially connected in series；
Lithium battery safety management system also include heat abstractor, for battery pack temperature it is too high when open heat abstractor accelerate
Give battery pack cooling, it is to avoid temperature is put aside.
The beneficial effects of the utility model are：A kind of lithium battery safety management system that the utility model is pointed out, can be right
Battery pack carries out safety management, extends lithium battery service life, reduces battery failure risk, substantially reduces battery set charge/discharge mistake
Control probability, it is ensured that battery pack is operated in normal temperature range, it is to avoid over-charging of battery is put excessively, improves safe class, system work(
Consumption is low, it is ensured that the prolonged safety applications of lithium battery group, it is to avoid security incident occur.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the utility model embodiment, below will be to needed for embodiment description
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Other accompanying drawings are obtained, wherein：
Fig. 1 is a kind of structural representation of the utility model lithium battery safety management system one preferred embodiment；
Fig. 2 is the circuit diagram of Charge Management in a kind of lithium battery safety management system of the utility model；
Fig. 3 is battery equalizing circuit and battery voltage acquisition electricity in a kind of lithium battery safety management system of the utility model
The circuit diagram on road；
Fig. 4 is the circuit diagram of battery pack safe secondary protection circuit in a kind of lithium battery safety management system of the utility model；
Fig. 5 is the circuit diagram of attemperating unit in a kind of lithium battery safety management system of the utility model；
Fig. 6 is the controller circuitry figure in a kind of lithium battery safety management system of the utility model.
Specific embodiment
The technical scheme in the utility model embodiment will be clearly and completely described below, it is clear that described
Embodiment is only a part of embodiment of the present utility model, rather than whole embodiments.Based on the implementation in the utility model
Example, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of the utility model protection.
Fig. 1 to Fig. 6 is referred to, the utility model embodiment includes：
A kind of lithium battery safety management system, including：
Control administrative unit；
The first gate-controlled switch, the second gate-controlled switch and the 3rd gate-controlled switch being sequentially connected in series；
First current sample and the second current sample；
First gate-controlled switch one terminates charging end positive pole, and the other end is being connected to battery pack just through the second gate-controlled switch
Pole, constitutes charging two class protection structure；
The control administrative unit connects the control end of the first gate-controlled switch and the second gate-controlled switch respectively, so as to control the
One gate-controlled switch and the second gate-controlled switch are switched on or off；
3rd gate-controlled switch one terminates battery anode, and the other end used as discharge end positive pole, control by the connection of its control end
Administrative unit processed；
First current sample is serially connected between charging end negative pole and battery electrode, simultaneously anti-for gathering charging current
Feed control administrative unit；
Second current sample is serially connected between discharge end negative pole and battery electrode, simultaneously anti-for gathering discharge current
Feed control administrative unit.
The battery pack is made up of the lithium battery group of at least 2 strings, every a string of the battery pack multisection lithium battery connection in series-parallel
Between be also equipped with attemperating unit and battery pack heating given when temperature is too low, safety management can be carried out to battery pack, extend
Lithium battery service life, reduction battery failure risk, eliminate safe hidden trouble.
The control administrative unit includes：
Controller U401；
Positive temperature coefficient can recover thermistor F1（PTC）, it is connected to charging end P1, charging end P1 connection external chargings
Device, P2 is battery pack both positive and negative polarity interface, and under normal temperature, positive temperature coefficient can recover thermistor F1 for low resistance state, and holding is normally filled
Electricity；When charging current is more than setting value, positive temperature coefficient can recover the rising of thermistor F1 temperature, be changed into high-impedance state, disconnect
Charge circuit, forms charging over-current hardware protection；
Charging signals observation circuit, including：Resistance R101, resistance R102 and triode Q101, resistance R101, resistance R102
Triode Q101 will be sent into after charger voltage partial pressure, when external charger is accessed, IN_CHG ports produce interrupt signal to call out
Awake controller, controller judges whether to meet charge condition, performs next step action；
Electric voltage observation circuit, including：Resistance R104, resistance R105, electric capacity C102 and diode D101, resistance R104, electricity
Resistance R105 will send into electric capacity C102 and diode D101 and controller AD_CHG ports after charger voltage partial pressure, work as charger
In normal range (NR), controller opens the second gate-controlled switch, i.e. metal-oxide-semiconductor Q104 to voltage, and otherwise metal-oxide-semiconductor Q104 is in and disconnects shape
State；
Second gate-controlled switch drive circuit, including resistance R109, resistance R110, resistance R111 and triode Q105, resistance
R109, resistance R110 and triode Q105 are connected between the source electrode of metal-oxide-semiconductor Q104 and battery electrode interface, and resistance R111 connects
It is connected between the base stage of triode Q105 and control end EN_CHG2, controlled terminal EN_CHG2 controls, as charging first class of protection
Mechanism；
Similarly, resistance R106, resistance R107, resistance R108 and triode Q103 constitute the first gate-controlled switch drive circuit,
First gate-controlled switch is metal-oxide-semiconductor Q102, controlled terminal EN_CHG1 controls, as charging second class protection mechanism；
Metal-oxide-semiconductor Q102, metal-oxide-semiconductor Q104 form the protection mechanism of plural serial stage, are only just formed when both opening and filled
Electrical circuit, substantially reduces battery pack charging chance of runaway, it is to avoid over-charging of battery or large current charge, improves safe class.
First current sample includes sampling resistor RS1, resistance R103 and electric capacity C101, resistance R103 and electric capacity C101
It is connected between battery electrode and charging end negative pole, sampling resistor RS1 two ends connect charging end negative pole respectively and battery pack is negative
Pole, for gathering charge circuit electric current and feeding back to controller, monitoring control devices charging current, one by FB_CHG ports
Denier exceeds normal value, will form charging excessively stream software protection by EN_CHG2 port shutdown metal-oxide-semiconductor Q104.
The lithium battery safety management system also includes battery pack first class of protection circuit, the battery pack first class of protection circuit
Including battery equalizing circuit and battery voltage acquisition circuit.Single series lithium battery group does not exist the inconsistent situation of cell voltage, because
This does not need equalizing circuit, when battery pack is more than or equal to 2 string, can be inconsistent in the presence of battery voltage between string and string, if
Do not deal with, just produce wooden pail effect, influence battery pack service life, necessarily cause when battery voltage monitoring is inaccurate or fails
Battery pack is overcharged, mistake is put, and there is severe compromise.
The battery equalizing circuit includes several resistance energy consuming circuitries, for attrition voltage that a string of battery packs higher
Voltage, maintains each string battery voltage equal.The resistance energy consuming circuitry is connected to controller with corresponding a string of batteries
Two ends, the resistance energy consuming circuitry respectively include the first energy consumption resistor, energy consuming circuitry triode, optocoupler, the second energy consumption resistor and
3rd energy consumption resistor, first energy consumption resistor and energy consuming circuitry triode are connected on corresponding a string of batteries two ends, the light
Coupling, the second energy consumption resistor are also connected on corresponding a string of batteries two ends, and the base stage of energy consuming circuitry triode is connected to optocoupler and
Between two energy consumption resistors, the 3rd energy consumption resistor is connected between the control end of optocoupler and the control end of controller.
The battery voltage acquisition circuit includes control triode, voltage acquisition triode, first voltage collection electricity respectively
Resistance and a RC filter circuits, the voltage acquisition triode, first voltage collection resistance and a RC filter circuits are connected on
Between the positive pole and ground wire of every a string of battery packs, a RC filter circuits are connected with the AD ports of controller, for gathering
A string of voltages of battery pack of correspondence, the base stage of voltage acquisition triode is also in series with second voltage collection resistance, Shuo Ge respectively
It is connected with control triode after two voltage acquisition resistor coupled in parallel, the base stage of the control triode is provided with tertiary voltage collection
Resistance, the tertiary voltage collection resistance is connected with the EN_ADC ports of controller, and controller passes through EN_ADC Port Managements
The on or off of triode is controlled, when management system meets sleep condition, controller shut-off control triode, so that voltage
Collection triode is also turned off, and voltage acquisition passage is closed, and further reduces system power dissipation, extends battery pack storage time.
Specifically as shown in figure 3, by taking 3 series lithium battery groups as an example, every a string of battery packs have balanced and battery voltage acquisition work(
Energy.Control end DSC_VB1, DSC_VB2, DSC_VB3 connection controller U401, for equilibrium a string of voltages of battery pack of correspondence；
Input AD_VB1, AD_VB2, AD_VB3 connect the AD ports of controller, for gathering a string of voltages of battery pack of correspondence.Control
Device processed is also by EN_ADC port controlling triode Q207 on or off, when management system meets sleep condition, controller
Shut-off Q207, so that triode Q204, Q205, Q206 are also turned off, voltage acquisition passage is closed, and further reduces system work(
Consumption, extends battery pack storage time and service life.With corresponding a string of the battery packs of control end DSC_VB1, input AD_VB1
As a example by, when management system works, Q206 conductings, battery voltage VB1 is through resistance R218, R219 partial pressure feeding controller AD_VB1
Port, such as detects the voltage of the voltage higher than VB2, VB3 of VB1, then control end DSC_VB1 control optocouplers U203 conductings, three poles
Pipe Q203 is also turned on therewith, and battery pack BAT1 is discharged by resistance R203, triode Q203.If now charged normal, control
Device processed can also turn off metal-oxide-semiconductor Q104 by control end EN_CHG2, so as to cut off charge circuit, it is to avoid battery pack VBT1 is overcharged.When
When VB1 voltages are down to equal with VB2, VB3, controller shut-off triode Q203 efficiently solves battery voltage inconsistent
Problem, if now meeting charge condition, metal-oxide-semiconductor Q104 recovers to conducting state, and battery pack continues to charge normal.Work as VB1+
When VB2+VB3 total voltages are more than or equal to full piezoelectric voltage, controller also turns off metal-oxide-semiconductor Q104, constitutes battery voltage one-level and protects
Shield.Through the above way, battery pack balancing and the accurate monitoring problem of cell voltage are not only solved, also combine Charge Management with
And the consideration of system power dissipation, it is ensured that the prolonged safety applications of lithium battery group.
The lithium battery safety management system also includes battery pack safe secondary protection circuit, the battery pack safe secondary protection circuit
Including：
Battery protection chip U301, one single chip is maximum to support 5 voltage monitorings for going here and there battery packs, and can carry out cascade and make
With；
2nd RC filter circuits, every a string of battery voltages are connected to battery protection core by the 2nd RC filter circuits respectively
The VCX pins of piece, X is 1,2,3 ..., as shown in figure 4,3 string battery voltage VB1, VB2, VB3 are connected respectively by RC filter networks
VC3, VC2, VC1 pin of U301 are connected to, VB3 is also connected to the VDD pins of U301, untapped voltage by R301, C301
Monitoring pin VC4, VC5 and VSS pin ground connection；
Resistance R305 and triode Q301, resistance R305 are connected on triode Q301 and battery protection chip output pin CO
Between, triode Q301 collector outputs EN_CHG1 controls the on or off of the first gate-controlled switch, while output end EN_
CHG1 is also connected on the input port of controller, the output state for informing controller EN_CHG1 ports；
When battery protection chip detect it is any string battery voltage it is too high when, output end CO output high level, triode
Q301 is turned on, and port EN_CHG1 is pulled low, and triode Q103 disconnects, and metal-oxide-semiconductor Q102 also disconnects therewith, and charge circuit is closed, and is kept away
Exempt from battery pack to occur overcharging, constitute battery voltage second class protection, meanwhile, EN_CHG1 ports cut-off signals also send into controller,
Further be also switched off for metal-oxide-semiconductor Q104 by controller, it is ensured that metal-oxide-semiconductor Q102, Q104 are all in off state, it is to avoid safe thing occurs
Therefore.
The battery voltage acquisition circuit and battery pack safe secondary protection circuit also have breaking protection function；Work as controller
When the VCX pins of AD_VBX ports battery protection chips U301 do not collect battery voltage, the first gate-controlled switch, the will be closed
Two gate-controlled switches and the 3rd gate-controlled switch, forbid battery pack charge or discharge.
The lithium battery safety management system also includes temperature collection circuit, and the temperature collection circuit includes resistance R401
With thermistor RT4, access controller AD_TSN ports after resistance R401 and thermistor RT4 partial pressures, thermistor RT4 is placed in
Internal battery pack, real-time monitoring battery pack temperature, when temperature is beyond charging normal or during discharge temp, controller closes discharge and recharge
Loop, forbids battery pack discharge and recharge at too high or too low temperature.
The attemperating unit includes：
Resistance R307, resistance R307 are banding or thread resistance, uniform and be close to every a string of the battery packs of winding；
Switch SW3, switch SW3 are open type temperature detect switch (TDS), are attached to the surface of resistance R307；
Metal-oxide-semiconductor Q302, resistance R307 are connected between the total positive pole of battery pack and metal-oxide-semiconductor Q302, and switch SW3 is connected to MOS
Between pipe Q302 grids and ground wire, metal-oxide-semiconductor source ground；
Resistance R306, is connected between metal-oxide-semiconductor Q302 grids and the EN_HEAT ports of controller；
When battery pack carries out charge or discharge at a lower temperature, before this, controller is beaten by EN_HEAT ports
Metal-oxide-semiconductor Q302 is opened, resistance R307 heatings transfer heat to battery pack by way of heat transfer, and battery pack temperature is raised, when
When controller AD_TSN Port detectings reach the requirement of charge or discharge to battery temperature, metal-oxide-semiconductor Q302 is closed, stop heating；
Switch SW3 automatically switches to closure state when heating-up temperature is detected more than certain numerical value, is disconnected by hardware
Metal-oxide-semiconductor Q302, increased 1 grade of temperature control protection, improve the reliability of attemperating unit.Work when avoiding battery pack low temperature or excess temperature
Make, it is ensured that battery pack is used in safe temperature range, it is to avoid the security incident caused by temperature control.
The lithium battery safety management system also includes buzzer drive circuit, and the buzzer drive circuit includes resistance
R402, resistance R403, triode Q401 and buzzer B4, the resistance R402 are connected with controller, the resistance R402, three
Pole pipe Q401, resistance R403 and buzzer B4 are sequentially connected in series, and necessary prompt tone is produced during for normal work, and when abnormal
（As temperature is too high, too low, battery pack is overcharged, mistake is put）Alarm signal is sent, unusual condition is warned, points out user to locate as early as possible
Reason, in case situation further deteriorates.Lithium battery safety management system also include heat abstractor, for battery pack temperature it is too high when beat
Open heat abstractor to accelerate to lower the temperature to battery pack, it is to avoid temperature is put aside, fully ensure that battery pack is used safely, extension lithium battery is used
Life-span.
In sum, a kind of lithium battery safety management system that the utility model is pointed out, electricity during to battery pack charge and discharge
Pressure, electric current, temperature carry out multistage monitoring, constitute the independent series connection protection mechanism of multistage to battery pack, significantly reduce battery pack mistake
Control risk, strengthening system reliability improves safe class.
Embodiment of the present utility model is the foregoing is only, the scope of the claims of the present utility model is not thereby limited, it is every
The equivalent structure or equivalent flow conversion made using the utility model description, or directly or indirectly it is used in other phases
The technical field of pass, is similarly included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of lithium battery safety management system, for the safety management of battery pack and its charging and discharging, it is characterised in that
Including：
Control administrative unit；
The first gate-controlled switch, the second gate-controlled switch and the 3rd gate-controlled switch being sequentially connected in series；
First current sample and the second current sample；
First gate-controlled switch one terminates charging end positive pole, and the other end is connected to the positive pole of battery pack through the second gate-controlled switch,
Composition charging two class protection structure；
The control administrative unit connects the control end of the first gate-controlled switch and the second gate-controlled switch respectively, so that control first can
Control switch and the second gate-controlled switch are switched on or off；
3rd gate-controlled switch one terminates battery anode, and used as discharge end positive pole, its control end connects control pipe to the other end
Reason unit；
First current sample is serially connected between charging end negative pole and battery electrode, for gathering charging current and feeding back to
Control administrative unit；
Second current sample is serially connected between discharge end negative pole and battery electrode, for gathering discharge current and feeding back to
Control administrative unit；
The battery pack is made up of the lithium battery groups of at least 2 strings multisection lithium battery connection in series-parallel, between every a string of the battery pack
It is also equipped with attemperating unit and is heated to battery pack when temperature is too low.
2. lithium battery safety management system according to claim 1, it is characterised in that the control administrative unit includes：
Controller；
Positive temperature coefficient can recover thermistor F1, be connected to charging end P1, and charging end P1 connects external charger, under normal temperature,
Positive temperature coefficient can recover thermistor F1 for low resistance state, keep charging normal；When charging current is more than setting value, positive temperature
Coefficient can recover the rising of thermistor F1 temperature, be changed into high-impedance state, disconnect charge circuit, form charging over-current hardware protection；
Charging signals observation circuit, including：Resistance R101, resistance R102 and triode Q101, resistance R101, resistance R102 will fill
Triode Q101 is sent into after electrical voltage partial pressure, when external charger is accessed, IN_CHG ports produce interrupt signal to wake up control
Device processed, controller judges whether to meet charge condition, performs next step action；
Electric voltage observation circuit, including：Resistance R104, resistance R105, electric capacity C102 and diode D101, resistance R104, resistance
R105 will send into electric capacity C102 and diode D101 and controller AD_CHG ports after charger voltage partial pressure, when charger electricity
It is pressed in normal range (NR), controller opens the second gate-controlled switch, i.e. metal-oxide-semiconductor Q104, otherwise Q104 is off；
Second gate-controlled switch drive circuit, including resistance R109, resistance R110, resistance R111 and triode Q105, resistance R109,
Resistance R110 and triode Q105 are connected between the source electrode of metal-oxide-semiconductor Q104 and battery electrode interface, and resistance R111 is connected to
Between the base stage and control end EN_CHG2 of triode Q105, controlled terminal EN_CHG2 controls, as charging first class of protection mechanism；
Similarly, resistance R106, resistance R107, resistance R108 and triode Q103 constitute the first gate-controlled switch drive circuit, first
Gate-controlled switch is metal-oxide-semiconductor Q102, controlled terminal EN_CHG1 controls, as charging second class protection mechanism；
Metal-oxide-semiconductor Q102, metal-oxide-semiconductor Q104 form the protection mechanism of plural serial stage, are only just formed when both opening and charged back
Road.
3. lithium battery safety management system according to claim 2, it is characterised in that first current sample includes adopting
Sample resistance RS1, resistance R103 and electric capacity C101, resistance R103 and electric capacity C101 be connected on battery electrode and charging end negative pole it
Between, sampling resistor RS1 two ends connect charging end negative pole and battery electrode respectively, for gathering charge circuit electric current and passing through
FB_CHG ports feed back to controller, monitoring control devices charging current, once exceed normal value, will be by EN_CHG2
Port shutdown metal-oxide-semiconductor Q104, forms charging excessively stream software protection.
4. lithium battery safety management system according to claim 2, it is characterised in that the lithium battery safety management system
Also include battery pack first class of protection circuit, the battery pack first class of protection circuit includes battery equalizing circuit and battery voltage acquisition
Circuit.
5. lithium battery safety management system according to claim 4, it is characterised in that the battery equalizing circuit includes number
Bar resistance energy consuming circuitry, the resistance energy consuming circuitry is connected to controller with corresponding a string of batteries two ends, the resistance
Energy consuming circuitry includes the first energy consumption resistor, energy consuming circuitry triode, optocoupler, the second energy consumption resistor and the 3rd energy consumption resistor respectively,
First energy consumption resistor and energy consuming circuitry triode are connected on corresponding a string of batteries two ends, the optocoupler, the second power consumption electricity
Resistance is also connected on corresponding a string of batteries two ends, the base stage of energy consuming circuitry triode be connected to optocoupler and the second energy consumption resistor it
Between, the 3rd energy consumption resistor is connected between the control end of optocoupler and the control end of controller.
6. lithium battery safety management system according to claim 4, it is characterised in that the battery voltage acquisition circuit point
Triode, voltage acquisition triode, first voltage collection resistance and a RC filter circuits, the voltage acquisition Bao Kuo not controlled
Triode, first voltage collection resistance and a RC filter circuits are connected between the positive pole of every a string of battery packs and ground wire,
First RC filter circuits are connected with the AD ports of controller, for gathering a string of voltages of battery pack of correspondence, voltage acquisition three
The base stage of pole pipe is also in series with second voltage collection resistance respectively, with control triode after several second voltage collection resistor coupled in parallel
It is connected, the base stage of the control triode is provided with tertiary voltage collection resistance, the tertiary voltage collection resistance and control
The EN_ADC ports of device are connected, and controller controls the on or off of triode by EN_ADC Port Managements, when management is
When system meets sleep condition, controller shut-off control triode, so that voltage acquisition triode is also turned off, voltage acquisition passage
Close, further reduce system power dissipation, extend battery pack storage time.
7. lithium battery safety management system according to claim 2, it is characterised in that the lithium battery safety management system
Also include battery pack safe secondary protection circuit, the battery pack safe secondary protection circuit includes：
Battery protection chip；
2nd RC filter circuits, every a string of battery voltages are connected to battery protection chip by the 2nd RC filter circuits respectively
VCX pins, the VDD pins that the total positive pole of battery pack is also connected to battery protection chip by a 2nd RC filter circuit are supplied
Electricity, untapped voltage monitoring pin ground connection；
Resistance R305 and triode Q301, resistance R305 be connected on triode Q301 and battery protection chip output pin CO it
Between, triode Q301 collector outputs EN_CHG1 controls the on or off of the first gate-controlled switch, while output end EN_
CHG1 is also connected on the input port of controller, the output state for informing controller EN_CHG1 ports；
When battery protection chip detect it is any string battery voltage it is too high when, output end CO output high level, triode Q301
Conducting, port EN_CHG1 is pulled low, and triode Q103 disconnects, and metal-oxide-semiconductor Q102 also disconnects therewith, and charge circuit is closed, it is to avoid electricity
Overcharging occurs in pond group, and constitutes battery voltage second class protection, meanwhile, EN_CHG1 ports cut-off signals also send into controller, control
Further be also switched off for metal-oxide-semiconductor Q104 by device, it is ensured that metal-oxide-semiconductor Q102, Q104 are all in off state, it is to avoid security incident occur.
8. lithium battery safety management system according to claim 1, it is characterised in that the lithium battery safety management system
Also include temperature collection circuit, the temperature collection circuit includes resistance R401 and thermistor RT4, resistance R401 and temperature-sensitive electricity
Access controller AD_TSN ports after resistance RT4 partial pressures, thermistor RT4 is placed in internal battery pack, real-time monitoring battery pack temperature,
When temperature is beyond charging normal or during discharge temp, controller closes charging and discharging circuit, forbids battery pack in too high or too low temperature
The lower discharge and recharge of degree.
9. lithium battery safety management system according to claim 1, it is characterised in that the attemperating unit includes：
Resistance R307, resistance R307 are banding or thread resistance, uniform and be close to every a string of the battery packs of winding；
Switch SW3, switch SW3 are open type temperature detect switch (TDS), are attached to the surface of resistance R307；
Metal-oxide-semiconductor Q302, resistance R307 are connected between the total positive pole of battery pack and metal-oxide-semiconductor Q302, and switch SW3 is connected to metal-oxide-semiconductor
Between Q302 grids and ground wire, metal-oxide-semiconductor source ground；
Resistance R306, is connected between metal-oxide-semiconductor Q302 grids and the EN_HEAT ports of controller；
When battery pack carries out charge or discharge at a lower temperature, before this, controller is opened by EN_HEAT ports
Metal-oxide-semiconductor Q302, resistance R307 are generated heat, and battery pack is transferred heat to by way of heat transfer, and battery pack temperature is raised, and works as control
When device AD_TSN Port detectings processed reach the requirement of charge or discharge to battery temperature, metal-oxide-semiconductor Q302 is closed, stop heating；
Switch SW3 automatically switches to closure state when heating-up temperature is detected more than certain numerical value, and MOS is disconnected by hardware
Pipe Q302, improves the reliability of attemperating unit.
10. lithium battery safety management system according to claim 1, it is characterised in that the lithium battery safety management system
System also includes buzzer drive circuit, and the buzzer drive circuit includes resistance R402, resistance R403, triode Q401 and honeybee
Ring device B4, the resistance R402 are connected with controller, the resistance R402, triode Q401, resistance R403 and buzzer B4
It is sequentially connected in series；
Lithium battery safety management system also include heat abstractor, for battery pack temperature it is too high when open heat abstractor accelerate to electricity
Pond group cooling, it is to avoid temperature is put aside.
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