CN207053166U - The protection circuit of lithium battery - Google Patents
The protection circuit of lithium battery Download PDFInfo
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- CN207053166U CN207053166U CN201720309860.2U CN201720309860U CN207053166U CN 207053166 U CN207053166 U CN 207053166U CN 201720309860 U CN201720309860 U CN 201720309860U CN 207053166 U CN207053166 U CN 207053166U
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Abstract
Field of batteries is the utility model is related to, discloses a kind of protection circuit of lithium battery.The protection circuit includes：Current detection module, for detecting the electric current in charging and discharging lithium battery loop, and export voltage corresponding with the electric current detected；Comparison module, for when lithium battery is in discharge condition the voltage be more than first predetermined value, or in the case that the voltage is less than second predetermined value when lithium battery is in charged state, export the first signal；Circuit control module, in the case where receiving first signal, secondary signal is closed, so as to cut off the charging and discharging circuit.The protection circuit can detect simultaneously protection power source in time, enhancing BMS (battery management system) stability and reliability, when short trouble disappears, can make battery recovery normal work, it is not necessary to which electricity is restarted under BMS when short trouble occurs.
Description
Technical field
It the utility model is related to field of batteries, more particularly to a kind of protection circuit of lithium battery.
Background technology
In recent years, lithium battery due to energy density is big, cycle performance is superior, can the good characteristic such as fast charging and discharging obtain
It is widely applied, but is influenceed by its characteristic, has very strict requirement to environment temperature, application method, while also to set
Fixed rational charge and discharge protecting voltage and overheat protector point.Rational application method is advantageous to battery and plays its optimum performance,
And complete protection circuit can be detected in time and treatment of battery produced problem in use, battery pack, charger are avoided
Damage, and therefore cause serious accident.
Wherein, short trouble is one of failure of most serious in all kinds of circuits.It is short when short trouble occurs in circuit system
Alignment detection circuit can rapid detection, short trouble disappear after, can system automatically terminate guard mode, be weigh circuit system
Reliability, security, one of the key index of stability.
Lithium battery protection circuit of the prior art, mostly using complicated detection circuit, cost is high, and reliability is low, right
The detection of short circuit is more to be realized by software, when electric current exceedes short circuit current threshold values, is just sent protection and is instructed, response speed compared with
Difference.Disappear in short trouble, BMS needs lower electricity to restart, and battery can just recover normal work.
Utility model content
In view of this, the utility model provides a kind of protection circuit of lithium battery, when short trouble occurs, can examine in time
Simultaneously protection power source is surveyed, strengthens the stability and reliability of BMS systems, when short trouble disappears, the normal work of battery recovery can be made
Make, it is not necessary to which electricity is restarted under BMS.
According to one side of the present utility model, there is provided a kind of protection circuit applied to lithium battery, including：Current detecting mould
Block, for detecting the electric current in charging and discharging lithium battery loop, and export voltage corresponding with the electric current detected；Comparison module, use
In when lithium battery is in discharge condition the voltage be more than first predetermined value, or electricity when lithium battery is in charged state
In the case that pressure is less than second predetermined value, the first signal is exported；Circuit control module, receiving the situation of first signal
Under, secondary signal is closed, so as to cut off the charging and discharging circuit.
Preferably, the current detection module includes：Differential amplification unit, for suppression common mode noise；Signal condition list
Member, the signal level exported for differential amplification unit described in lifting.
Preferably, the circuit control module includes：Clock unit, for providing clock signal；By ripple protection location, use
In controlling the output of secondary signal according to the clock signal and first signal so as to controlling cutting for the charging and discharging circuit
Disconnected and conducting.
Preferably, the differential amplification unit includes：First operational amplifier, first resistor, second resistance, the 3rd electricity
Resistance, the 4th resistance, the first electric capacity and the second electric capacity, the first resistor are connected to the current sample electricity in the charging and discharging circuit
Between the negative input end of the negative pole of resistance and first operational amplifier, the second resistance is connected in the charging and discharging circuit
The positive pole of current sampling resistor and the positive input terminal of first operational amplifier between, the 3rd resistor and described first
Electric capacity is parallel between negative input end and the output end of first operational amplifier, the 4th resistance and second electric capacity
It is parallel between the negative pole of the return terminal of the charging and discharging circuit and the positive input terminal of first operational amplifier.
Preferably, the signal condition unit includes：5th resistance, the 6th resistance and the 3rd electric capacity, the 5th resistance
It is connected between the output end of the differential amplification unit and the output end of the signal condition unit, the 6th resistance connection
Between the output end of a reference source and the signal condition unit, the 3rd capacitance connection is in the return of the charging and discharging circuit
Between the output end of the negative pole at end and the signal condition unit.
Preferably, the comparison module includes：First comparator, the second comparator, the 7th resistance, the 8th resistance, the 9th
Resistance, the tenth resistance, the 11st resistance, the first diode and the second diode, one end of the 7th resistance are connected to described
The output end of current detection module, the other end and the positive input terminal of the first comparator and the negative input of second comparator
End connection, the 8th resistance be connected to the positive input terminal of the first comparator and the first comparator output end it
Between, the 9th resistance is connected between the positive input terminal of second comparator and the output end of second comparator, institute
State the tenth resistance to be connected between the power supply source of the protection circuit and the output end of the first comparator, the 11st electricity
Resistance is connected between the power supply source of the protection circuit and the output end of second comparator, the output of the first comparator
End and the output end input with the input and second diode of first diode respectively of second comparator
The output end of end connection, first diode and second diode is connected with the output end of the comparison module.
Preferably, it is described to include by ripple protection location：DQ triggers, triode, the 4th diode, the 14th resistance,
15 resistance, the 7th electric capacity, the output end of the clock end connection clock unit of the DQ triggers, the data of the DQ triggers
End connects the power supply source of the protection circuit with feeder ear, and the set end of the DQ triggers connects the discharge and recharge with earth terminal
The negative pole of the return terminal in loop, the output end of the input connection comparison module of the 4th diode, the described 4th 2
The output end of pole pipe connects the reset terminal of the DQ triggers, the 7th capacitance connection in the protection circuit power supply source with
Between the set end of the DQ triggers, the 14th resistance be connected to the DQ triggers earth terminal and reset terminal it
Between, the 15th resistance is connected between the reversed-phase output of the DQ triggers and the base stage of the triode, and described three
The emitter stage of pole pipe connects the negative pole of the return terminal of the charging and discharging circuit, and the colelctor electrode of the triode connects the discharge and recharge
The switching tube in loop or the driving stage of relay.
Preferably, the clock unit includes：Timer, the 12nd resistance, the 13rd resistance, the 4th electric capacity, the 5th electricity
Appearance, the 6th electric capacity and the 3rd diode, the feeder ear and reset terminal of the timer are connected to the power supply source of the protection circuit,
The triggering end of the timer is connected with threshold value end, the ground terminal of the timer and the negative pole of the return terminal of the charging and discharging circuit
It is connected, the 3rd diode and the 13rd resistor coupled in parallel are described between the discharge end of the timer and the threshold value end
One end of 6th electric capacity is connected to the negative pole of the return terminal of the charging and discharging circuit, and the other end of the 6th electric capacity is connected to institute
The control terminal of timer is stated, the output end of the timer is connected with the output end of the clock unit, the 12nd resistance
It is connected between the power supply source of the protection circuit and the discharge end of the timer, the 4th capacitance connection is in the protection
Between the negative pole of the power supply source of circuit and the return terminal of the charging and discharging circuit, the 5th capacitance connection is in the timer
Between the negative pole of the return terminal of threshold value end and the charging and discharging circuit.
Preferably, the protection circuit also includes：5th diode and the 6th diode, the 5th diode and described
3rd diodes in parallel, the 6th diode and the 4th diodes in parallel.
According to another aspect of the present utility model, there is provided a kind of lithium battery, including at least one lithium battery monomer, and it is right
The lithium battery monomer carries out the charging and discharging circuit of discharge and recharge, and the lithium battery further comprises according to a side of the present utility model
The protection circuit that face provides, the electric current that the current detection module in the protection circuit is connected in the charging and discharging circuit are adopted
The positive pole and negative pole of sample resistance.
As seen from the above technical solution, the utility model can overcome in the prior art, detection circuit is complicated, cost is high,
Reliability is low, and by software detection short circuit so that response speed is poor, short trouble needs lower electricity to restart after eliminating could recover electricity
The technical problems such as pond work.
In the utility model embodiment, charging and discharging lithium battery circuit, response speed are protected by hardware circuit control
It hurry up, strong interference immunity, reliability is high, can be applied to the short-circuit protection of various battery packs.When short trouble occurs, can examine in time
Survey and protect charge-discharge circuit, strengthen BMS stability and reliability.Circuit protection mechalusm is Cycle by Cycle triggering mode, when short
During the failure vanishes of road, battery can recover normal work, it is not necessary to which electricity is restarted under BMS, ensures BMS not power down.
Brief description of the drawings
By referring to description of the following drawings to the utility model embodiment, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows current detection module in the protection circuit according to the lithium battery of the utility model embodiment offer and compared
The structural representation of module；
Fig. 2 shows the structure of circuit control module in the protection circuit according to the lithium battery of the utility model embodiment offer
Schematic diagram；
Fig. 3 shows the method stream of the protection circuit protection charging and discharging lithium battery circuit provided using the utility model embodiment
Cheng Tu.
Embodiment
The utility model is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar
Reference represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown
Some known parts.
It describe hereinafter many specific details of the present utility model, such as the structure of all parts, material, chi
Very little, handling process and technology, to be more clearly understood that the utility model.It is but just as the skilled person will understand
Like that, the utility model can not be realized according to these specific details.
The utility model can be presented in a variety of manners, some of examples explained below.Fig. 1 shows new according to this practicality
The structural representation of current detection module and comparison module in the protection circuit for the lithium battery that type embodiment provides, Fig. 2 show root
The structural representation of circuit control module in the protection circuit of the lithium battery provided according to the utility model embodiment.The utility model
The protection circuit applied to lithium battery that embodiment provides includes：Current detection module 101, comparison module 102 and circuit controls
Module 103.
Current detection module 101 is used for the electric current for detecting charging and discharging lithium battery loop, and exports the electric current pair with detecting
The voltage answered.Current detection module 101 is included for the differential amplification unit of suppression common mode noise and for difference described in lifting
The signal condition unit of the signal level of amplifying unit output.The differential amplification unit includes：Operational amplifier U1-A, resistance
R1, resistance R2, resistance R3, resistance R4, electric capacity C1 and electric capacity C2.Resistance R1 is connected to the current sample in the charging and discharging circuit
Between the negative pole ISEN- and operational amplifier U1-A of resistance negative input end, resistance R2 is connected in the charging and discharging circuit
Between the positive pole ISEN+ and operational amplifier U1-A of current sampling resistor positive input terminal, resistance R3 and electric capacity C1 is parallel to fortune
Between negative input end and the output end of calculating amplifier U1-A, resistance R4 and electric capacity C2 is parallel to the return terminal of the charging and discharging circuit
Negative pole AGND and operational amplifier U1-A positive input terminal between.The signal condition unit includes：Resistance R5, resistance R6 and
Electric capacity C3.Resistance R5 is connected between the output end of the differential amplification unit and the output end VO of the signal condition unit,
Resistance R6 is connected between a reference source VREF and the output end VO of the signal condition unit, and electric capacity C3 is connected to the discharge and recharge
Between the negative pole AGND of the return terminal in loop and the output end VO of the signal condition unit.
Comparison module 102 is used for the voltage when lithium battery is in discharge condition and is more than first predetermined value, or lithium electricity
In the case that the voltage is less than second predetermined value when pond is in charged state, the first signal is exported.Comparison module 102 includes：
Comparator U2-A, comparator U2-B, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, diode D11 and diode
D12.Resistance R7 one end is connected to the output end VO of current detection module 101, the positive input terminal of the other end and comparator U2-A
Connected with comparator U2-B negative input end, resistance R8 is connected to comparator U2-A positive input terminal and comparator U2-A output
Between end, resistance R9 is connected between comparator U2-B positive input terminal and comparator U2-B output end, and resistance R10 is connected to
Between the power supply source VCC and comparator U2-A of the protection circuit output end, resistance R11 is connected to the confession of the protection circuit
Between power supply VCC and comparator U2-B output end, comparator U2-A output end and comparator U2-B output end respectively with
Diode D11 input connects with diode D12 input, the diode D11 and diode D12 output end mould compared with
The output end SC_H connections of block 102.
Circuit control module 103 cuts off the charging and discharging circuit in the case where receiving first signal.Control in loop
Molding block 103 includes clock unit 1031 and by ripple protection location 1032.Clock unit 1031 is used to provide clock signal, by ripple
Protection location 1032 is used for the output according to the clock signal and first signal control secondary signal so as to described in controlling
The cut-out and conducting of charging and discharging circuit.Clock unit 1031 includes：Timer U3, resistance R12, resistance R13, electric capacity C4, electric capacity
C5, electric capacity C6 and diode D21, timer U3 feeder ear Vcc and reset terminal RESET are connected to the power supply of the protection circuit
Source VCC, timer U3 triggering end TRIB are connected with threshold value end THOLD, timer U3 ground terminal GND and the charging and discharging circuit
The negative pole AGND of return terminal be connected, diode D21 and resistance R13 are parallel to timer U3 discharge end DISCHG and threshold value end
Between THOLD, the other end that electric capacity C6 one end is connected to the negative pole AGND, electric capacity C6 of the return terminal of the charging and discharging circuit connects
Timer U3 control terminal CVOLT is connected to, timer U3 output end OUT is connected with the output end OSC of clock unit 1031, electricity
Resistance R12 is connected between power supply source VCC and timer U3 the discharge end DISCHG of protection circuit, and electric capacity C4 is connected to the guarantor
Between the negative pole AGND of the power supply source VCC of protection circuit and the return terminal of the charging and discharging circuit, electric capacity C5 is connected to timer U3
Threshold value end THOLD and the charging and discharging circuit return terminal negative pole AGND between.In certain embodiments, clock unit
1031 also include diode D22, and diode D22 is in parallel with diode D21.Include by ripple protection location 1032：DQ triggers U4-
A, triode Q1, diode D31, resistance R14, resistance R15, electric capacity C7, DQ trigger U4-A clock end C connection clock units
1031 output end OSC, DQ trigger U4-A data terminal D and feeder ear VDD connects the power supply source VCC of the protection circuit,
DQ triggers U4-A set end S and earth terminal VSS connect the negative pole AGND of the return terminal of the charging and discharging circuit, diode
The output end SC_H of D31 input connection comparison module 102, diode D31 output end connection DQ triggers U4-A's answers
Position end R, electric capacity C7 are connected between the power supply source VCC and DQ trigger U4-A set end S of the protection circuit, resistance R14
It is connected between DQ triggers U4-A earth terminal VSS and reset terminal R, resistance R15 is connected to the anti-phase defeated of DQ triggers U4-A
Go out endBetween triode Q1 base stage B, triode Q1 emitter E connects the negative pole of the return terminal of the charging and discharging circuit
AGND, triode the Q1 switching tube of the colelctor electrode C connections charging and discharging circuit or the driving stage DRIVE of relay.At some
In embodiment, also include diode D32 by ripple protection location 1032, diode D32 is in parallel with diode D31.
When lithium battery is in discharge condition, load, which is broken down, there are short-circuit conditions, and current detection module 101 exports electricity
When pressure is more than first predetermined value, the level of the comparator U2-A outputs in comparison module 102 changes, and is changed into high from low level
Level, comparison module 102 export high level signal with the DQ triggers in trigger circuit control module 103 by output end SC_H
U4-A, close drive signal.When lithium battery is in charged state, lithium battery, which breaks down, there are short-circuit conditions, current detecting
When the output voltage of module 101 is less than second predetermined value, the comparator U2-B output levels in comparison module 102 change, by
Low level is changed into high level, and comparison module 102 exports high level signal with trigger circuit control module 103 by output end SC_H
In DQ trigger U4-A, close drive signal.
The protection circuit that embodiment of the present utility model provides can apply to lithium battery, and the lithium battery can be included extremely
A few lithium battery monomer, and the charging and discharging circuit of discharge and recharge is carried out to the lithium battery monomer, the lithium battery also includes
The protection circuit that embodiment of the present utility model provides, as shown in figure 1, the current detection module 101 in the protection circuit connects
Meet the positive pole ISEN+ and negative pole ISEN- of the current sampling resistor in the charging and discharging circuit.
Fig. 3 shows the method stream of the protection circuit protection charging and discharging lithium battery circuit provided using the utility model embodiment
Cheng Tu.
In step S301, the discharge current of lithium battery is set to protect threshold values and charging current protection threshold values.
Discharge current protection threshold values can take 2 times to 5 times of the nominal discharge current of lithium battery, charging current protection threshold values
2 times to 5 times of the specified charging current of lithium battery can be taken.
In step S302, protect threshold values to obtain first predetermined value according to discharge current, protect threshold values to obtain according to charging current
To second predetermined value.
First predetermined value can be obtained according to below equation：
VREF_+V1For first predetermined value, IoFor the nominal discharge current value of lithium battery, K is constant (span is 2 to 5),
Represent the nominal discharge current value I of discharge current protection threshold values and lithium batteryoMultiple proportion, VREFOn the basis of source VREF electricity
Pressure value, RSENFor current sampling resistor value, R1、R2、R3、R4、R5And R6Respectively resistance R1, resistance R2, resistance R3, resistance R4, electricity
Hinder R5 and resistance R6 resistance value.
Second predetermined value can be obtained according to below equation：
VREF_-V2For second predetermined value, IiFor the specified charging current value of lithium battery, K is constant (span is 2 to 5),
Represent the specified charging current value I of charging current protection threshold values and lithium batteryiMultiple proportion, VREFOn the basis of source VREF electricity
Pressure value, RSENFor current sampling resistor value, R1、R2、R3、R4、R5And R6Respectively resistance R1, resistance R2, resistance R3, resistance R4, electricity
Hinder R5 and resistance R6 resistance value.
In step S303, lithium battery status is judged.If lithium battery is in discharge condition, step S304 is performed,
If lithium battery is in charged state, step S306 is performed.
In step S304, voltage corresponding with discharge current is obtained using current detection module.
When lithium battery is to load discharge, electric current forward stream overcurrent sampling resistor, in the both ends shape of current sampling resistor
Into forward voltage, by current detection module, voltage corresponding with the electric current detected is exported.The electric current detected is corresponding
Voltage between relation meet below equation：
Wherein, VoFor the value of voltage corresponding with the electric current detected, VREFOn the basis of source VREF magnitude of voltage, I1To flow through
The current value of current sampling resistor, RSENFor current sampling resistor value, R1、R2、R3、R4、R5And R6Respectively resistance R1, resistance R2,
Resistance R3, resistance R4, resistance R5 and resistance R6 resistance value.
In step S305, judge whether voltage corresponding with discharge current is more than first predetermined value.If so, then perform step
S308, otherwise perform step S309.
In step S306, voltage corresponding with charging current is obtained using current detection module.
When to lithium cell charging, electric current flows counterflow through current sampling resistor, is formed at the both ends of current sampling resistor negative
To voltage, by current detection module, voltage corresponding with the electric current detected is exported.The corresponding electricity of the electric current that detects
Relation between pressure meets below equation：
Wherein, VoFor the value of voltage corresponding with the electric current detected, VREFOn the basis of source VREF magnitude of voltage, I2To flow through
The current value of current sampling resistor, RSENFor current sampling resistor value, R1、R2、R3、R4、R5And R6Respectively resistance R1, resistance R2,
Resistance R3, resistance R4, resistance R5 and resistance R6 resistance value.
In step S307, judge whether voltage corresponding with charging current is less than second predetermined value.If so, then perform step
S308, otherwise perform step S309.
In step S308, the first signal is exported using comparison module, trigger circuit control module closes secondary signal, so as to
Cut off the charging and discharging circuit.
When lithium battery is in discharge condition, load, which is broken down, there are short-circuit conditions, current detection module output voltage
VoMore than VREF_+V1When, comparison module output level changes, and is changed into high level from low level, trigger circuit control module is closed
Drive signal is closed, cuts off the charging and discharging circuit of lithium battery.When lithium battery is in charged state, lithium battery break down occur it is short
Road situation, current detection module output voltage VoLess than VREF_-V2When, comparison module output level changes, and is become by low level
For high level, trigger circuit control module closes drive signal, cuts off the charging and discharging circuit of lithium battery.
In step S309, make circuit control module continue to export secondary signal, turn on the charging and discharging circuit.
If the voltage V of current detection module outputoIn zone of reasonableness, then comparison module persistently exports low level, loop control
Molding block persistently exports effective drive signal, makes the charging and discharging circuit of lithium battery in the conduction state.
In the utility model embodiment, charging and discharging lithium battery circuit, response speed are protected by hardware circuit control
It hurry up, strong interference immunity, reliability is high, can be applied to the short-circuit protection of various battery packs.When short trouble occurs, can examine in time
Survey and protect charge-discharge circuit, strengthen BMS stability and reliability.Circuit protection mechalusm is Cycle by Cycle triggering mode, when short
During the failure vanishes of road, battery can recover normal work, it is not necessary to which electricity is restarted under BMS, ensures BMS not power down.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe,
Also it is only described specific embodiment not limit the utility model.Obviously, as described above, many modification and change can be made
Change.This specification is chosen and specifically describes these embodiments, is to preferably explain that principle of the present utility model and reality should
With so that skilled artisan can repairing using the utility model and on the basis of the utility model well
Change use.The utility model is only limited by claims and its four corner and equivalent.
Claims (10)
- A kind of 1. protection circuit applied to lithium battery, it is characterised in that including：Current detection module, for detecting the electric current in charging and discharging lithium battery loop, and export electricity corresponding with the electric current detected Pressure；Comparison module, for when lithium battery is in discharge condition the voltage be more than first predetermined value, or lithium battery is in In the case that the voltage is less than second predetermined value during charged state, the first signal is exported；Circuit control module, in the case where receiving first signal, secondary signal is closed, so as to cut off the discharge and recharge Loop.
- 2. protection circuit according to claim 1, it is characterised in that the current detection module includes：Differential amplification unit, for suppression common mode noise；Signal condition unit, the signal level exported for differential amplification unit described in lifting.
- 3. protection circuit according to claim 1, it is characterised in that the circuit control module includes：Clock unit, for providing clock signal；By ripple protection location, for controlling the output of secondary signal according to the clock signal and first signal so as to controlling The cut-out and conducting of the charging and discharging circuit.
- 4. protection circuit according to claim 2, it is characterised in that the differential amplification unit includes：First operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity and the second electric capacity, institute State the negative pole for the current sampling resistor that first resistor is connected in the charging and discharging circuit and bearing for first operational amplifier Between input, the second resistance is connected to the positive pole and the described first fortune of the current sampling resistor in the charging and discharging circuit Between the positive input terminal for calculating amplifier, the 3rd resistor is parallel to the negative of first operational amplifier with first electric capacity Between input and output end, the 4th resistance and second electric capacity are parallel to the negative of the return terminal of the charging and discharging circuit Between the positive input terminal of pole and first operational amplifier.
- 5. protection circuit according to claim 2, it is characterised in that the signal condition unit includes：5th resistance, the 6th resistance and the 3rd electric capacity, the 5th resistance be connected to the differential amplification unit output end and Between the output end of the signal condition unit, the 6th resistance is connected to the output of a reference source and the signal condition unit Between end, the negative pole of return terminal of the 3rd capacitance connection in the charging and discharging circuit and the output of the signal condition unit Between end.
- 6. protection circuit according to claim 1, it is characterised in that the comparison module includes：First comparator, the second comparator, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, first Diode and the second diode, one end of the 7th resistance are connected to the output end of the current detection module, the other end with The positive input terminal of the first comparator connects with the negative input end of second comparator, and the 8th resistance is connected to described Between the output end of the positive input terminal of first comparator and the first comparator, the 9th resistance is connected to second ratio Compared between the positive input terminal of device and the output end of second comparator, the tenth resistance is connected to the confession of the protection circuit Between the output end of power supply and the first comparator, the 11st resistance is connected to power supply source and the institute of the protection circuit Between the output end for stating the second comparator, the output end of the output end of the first comparator and second comparator respectively with The input of first diode connects with the input of second diode, first diode and the described 2nd 2 The output end of pole pipe is connected with the output end of the comparison module.
- 7. protection circuit according to claim 3, it is characterised in that described to include by ripple protection location：DQ triggers, triode, the 4th diode, the 14th resistance, the 15th resistance, the 7th electric capacity, the DQ triggers Clock end connects the output end of clock unit, and the data terminal of the DQ triggers connects the power supply of the protection circuit with feeder ear Source, the set end of the DQ triggers connect the negative pole of the return terminal of the charging and discharging circuit, the four or two pole with earth terminal The input of pipe connects the output end of the comparison module, and the output end of the 4th diode connects answering for the DQ triggers Position end, the 7th capacitance connection is between the power supply source of the protection circuit and the set end of the DQ triggers, and described the 14 resistance are connected between the earth terminal and reset terminal of the DQ triggers, and the 15th resistance is connected to the DQ triggerings Between the base stage of the reversed-phase output of device and the triode, the emitter stage of the triode connects returning for the charging and discharging circuit Hui Duan negative pole, the colelctor electrode of the triode connect the switching tube of the charging and discharging circuit or the driving stage of relay.
- 8. protection circuit according to claim 7, it is characterised in that the clock unit includes：Timer, the 12nd resistance, the 13rd resistance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the 3rd diode, it is described The feeder ear and reset terminal of timer are connected to the power supply source of the protection circuit, triggering end and the threshold value end phase of the timer Even, the ground terminal of the timer is connected with the negative pole of the return terminal of the charging and discharging circuit, the 3rd diode and the 13rd For resistor coupled in parallel between the discharge end of the timer and the threshold value end, one end of the 6th electric capacity is connected to the charge and discharge The negative pole of the return terminal of electrical circuit, the other end of the 6th electric capacity are connected to the control terminal of the timer, the timer Output end be connected with the output end of the clock unit, the 12nd resistance be connected to the power supply source of the protection circuit with Between the discharge end of the timer, power supply source and the charging and discharging circuit of the 4th capacitance connection in the protection circuit Return terminal negative pole between, the 5th capacitance connection is in the threshold value end of the timer and the return of the charging and discharging circuit Between the negative pole at end.
- 9. protection circuit according to claim 8, it is characterised in that also include：5th diode and the 6th diode, institute State the 5th diode and the 3rd diodes in parallel, the 6th diode and the 4th diodes in parallel.
- 10. a kind of lithium battery, including at least one lithium battery monomer, and the charge and discharge of discharge and recharge is carried out to the lithium battery monomer Electrical circuit, it is characterised in that the lithium battery further comprises the protection as described in any claim in claim 1 to 9 Circuit, the current detection module in the protection circuit connect the positive pole of the current sampling resistor in the charging and discharging circuit With negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309860.2U CN207053166U (en) | 2017-03-28 | 2017-03-28 | The protection circuit of lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309860.2U CN207053166U (en) | 2017-03-28 | 2017-03-28 | The protection circuit of lithium battery |
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| CN207053166U true CN207053166U (en) | 2018-02-27 |
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| CN201720309860.2U Active CN207053166U (en) | 2017-03-28 | 2017-03-28 | The protection circuit of lithium battery |
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| CN (1) | CN207053166U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738817A (en) * | 2019-02-26 | 2019-05-10 | 东莞市熠源电子科技有限公司 | The system for monitoring battery charging condition |
| CN110572044A (en) * | 2019-10-11 | 2019-12-13 | 珠海格力电器股份有限公司 | Power control circuit and electrical equipment |
| CN110571891A (en) * | 2019-10-16 | 2019-12-13 | 深圳市誉娇诚科技有限公司 | Secondary protection circuit for charging and discharging hardware of lithium ion battery |
| CN111316519A (en) * | 2019-03-26 | 2020-06-19 | 深圳欣锐科技股份有限公司 | Backflow prevention circuit, power supply and backflow prevention method |
| CN112751321A (en) * | 2020-12-25 | 2021-05-04 | 深圳市航天新源科技有限公司 | Protection circuit, method and power supply controller |
| CN112782546A (en) * | 2020-12-31 | 2021-05-11 | 国家电网有限公司 | Insulator leakage current acquisition system |
| CN113644725A (en) * | 2020-04-27 | 2021-11-12 | 深圳供电局有限公司 | Storage battery charging and discharging management and protection system and direct current power supply |
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2017
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738817A (en) * | 2019-02-26 | 2019-05-10 | 东莞市熠源电子科技有限公司 | The system for monitoring battery charging condition |
| CN111316519A (en) * | 2019-03-26 | 2020-06-19 | 深圳欣锐科技股份有限公司 | Backflow prevention circuit, power supply and backflow prevention method |
| CN110572044A (en) * | 2019-10-11 | 2019-12-13 | 珠海格力电器股份有限公司 | Power control circuit and electrical equipment |
| CN110571891A (en) * | 2019-10-16 | 2019-12-13 | 深圳市誉娇诚科技有限公司 | Secondary protection circuit for charging and discharging hardware of lithium ion battery |
| CN113644725A (en) * | 2020-04-27 | 2021-11-12 | 深圳供电局有限公司 | Storage battery charging and discharging management and protection system and direct current power supply |
| CN113644725B (en) * | 2020-04-27 | 2024-02-20 | 深圳供电局有限公司 | Storage battery charge and discharge management and protection system and direct current power supply |
| CN112751321A (en) * | 2020-12-25 | 2021-05-04 | 深圳市航天新源科技有限公司 | Protection circuit, method and power supply controller |
| CN112782546A (en) * | 2020-12-31 | 2021-05-11 | 国家电网有限公司 | Insulator leakage current acquisition system |
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