CN105305564B - Lithium-ions battery group cell equalizing circuit and equalization methods - Google Patents
Lithium-ions battery group cell equalizing circuit and equalization methods Download PDFInfo
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- CN105305564B CN105305564B CN201510839685.3A CN201510839685A CN105305564B CN 105305564 B CN105305564 B CN 105305564B CN 201510839685 A CN201510839685 A CN 201510839685A CN 105305564 B CN105305564 B CN 105305564B
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Abstract
The present invention discloses a kind of lithium-ions battery group cell equalizing circuit, comprising：Switch element, balancing element, the power dissipation component being connected in series；First monomer voltage sample circuit；Current-limiting control circuit, it is according to the control voltage of the size output control switch element manipulation state of cell sampled voltage；First drive circuit, it is according to the control voltage controlling switch element conductive of current-limiting control circuit or disconnection；Second comonomer voltage sampling circuit；Linearity control circuit, it is according to the control voltage of the working condition of the size output control balancing element of cell sampled voltage；Second drive circuit, it controls the working condition of balancing element according to the control voltage of linearity control circuit, to cell Balance route.The present invention promotes each monomer voltage of battery pack to tend to be balanced by Balance route, and cell poor performance mutation is big caused by preventing the voltage in battery pack between cell inconsistent.
Description
Technical field
The present invention relates to electronic circuit field, and in particular to a kind of lithium-ions battery group cell equalizing circuit and
Weighing apparatus method.
Background technology
In space power system field, energy storage for power supply is more and more carried out using lithium-ions battery, lithium-ions battery makes
The balance phenomenon of battery is must take into consideration during, and as the increase of service time of battery, this balance phenomenon are further tight
Weight, life-span and the reliability of battery are had a strong impact on, therefore battery balanced management is space power system lithium-ions battery group management
One essential key technology.Along with the use of lithium-ions battery, various balanced management schemes also begin to be applied to
In space power system.Mainly there are break-make resistance shunt method, switching capacity equalizaing charge and average electricity in these balanced management schemes
Cell voltage equalization etc., more than above-mentioned balanced management project plan comparison is to reach balanced control with the method that hardware is combined based on software
The purpose of system, its common feature are circuit structure complexity, and control is difficult, is not easy to modularization.
The content of the invention
The present invention provides a kind of lithium-ions battery group cell equalizing circuit and equalization methods, is promoted by Balance route
The each monomer voltage of battery pack is set to tend to be balanced, monomer electricity caused by preventing the voltage in battery pack between cell inconsistent
Pond poor performance mutation is big.
To achieve the above object, the present invention provides a kind of storage battery unit cell equalizing circuit, is characterized in, the equilibrium
Circuit in parallel includes in cell both ends, the equalizing circuit：
Switch element, balancing element, the power dissipation component being connected in series, it is connected in parallel on cell both ends；
First monomer voltage sample circuit, its inlet circuit connection cell positive pole, is carried out to monomer battery voltage
Sampling；
Current-limiting control circuit, its inlet circuit connect the first monomer voltage sample circuit, and switch element and power
Between dissipative element；According to the control voltage of the size output control switch element manipulation state of cell sampled voltage；
First drive circuit, its inlet circuit connection current-limiting control circuit, output termination switch element triggering end, according to
Loop is turned on or off where the control voltage controlling switch element and balancing element of current-limiting control circuit；
Second comonomer voltage sampling circuit, its inlet circuit connection cell positive pole, is carried out to monomer battery voltage
Sampling；
Linearity control circuit, its inlet circuit connection second comonomer voltage sampling circuit, and balancing element and power
Between dissipative element；According to the control voltage of the working condition of the size output control balancing element of cell sampled voltage；
Second drive circuit, its inlet circuit connection linearity control circuit, output termination balancing element triggering end, according to
The working condition of the control voltage control balancing element of linearity control circuit, to cell Balance route.
Above-mentioned current-limiting control circuit includes：
First reference circuit, it exports the first preset reference voltage；
Lower limit comparison circuit, it receives the cell sampled voltage of the first monomer voltage sampling circuit samples and first pre-
If reference voltage is compared, when cell sampled voltage is more than or equal to the first preset reference voltage, output switch element is led
Logical control voltage；
First error amplifying circuit, it receives the control voltage of lower limit comparison circuit output, is exported with the first reference circuit
Branch pressure voltage relative error amplification, export to the first drive circuit.
Above-mentioned linearity control circuit includes：
Second reference circuit, it exports the second preset reference voltage；
Voltage selecting circuit, the cell sampled voltage and second that its reception second comonomer voltage sampling circuit samples are pre-
If reference voltage is compared, when cell sampled voltage is less than the second preset reference voltage, voltage selecting circuit output is single
Body battery sampling voltage is as control voltage, when cell sampled voltage is more than or equal to the second preset reference voltage, voltage choosing
Circuit output the second preset reference voltage is selected as control voltage；
Second error amplifying circuit, the control voltage of its receiving voltage selection circuit, point with the output of the second reference circuit
Piezoelectricity pressure relative error amplification, is exported to the second drive circuit.
Above-mentioned switch element and balancing element are NPN type pliotron.
Above-mentioned second error amplifying circuit, the second drive circuit, balancing element, power dissipation component, and the second error
The load resistance of amplifying circuit branch pressure voltage forms constant-current source circuit.
A kind of equalization methods of above-mentioned lithium-ions battery group cell equalizing circuit, are characterized in, the equalization methods
Comprising：
Current-limiting control circuit compares cell sampled voltage and the first preset reference voltage, when cell sampled voltage
More than or equal to the first preset reference voltage, by the first drive circuit driving switch element ON operation, provided for balancing element
Current path；
Linearity control circuit compares cell sampled voltage and the second preset reference voltage, when cell sampled voltage
Less than the second preset reference voltage, balancing element carries out balanced operation under ON operation state to cell；When monomer electricity
Pond sampled voltage is more than or equal to the second preset reference voltage, and balancing element is in constant current equilibrium state with cell.
Above-mentioned cell sampled voltage is less than the first preset reference voltage, and current-limiting control circuit does not drive out without output
Element conductive is closed, balancing element does not work.
The comparison of above-mentioned current-limiting control circuit and driving saddlebag contain：
Lower limit comparison circuit receives cell sampled voltage and the first preset reference voltage of the first reference circuit output
It is compared；
When cell sampled voltage is less than the first preset reference voltage, lower limit comparison circuit output no-voltage, first misses
Poor amplifying circuit is not turned on without output, switch element, and balancing element does not carry out balanced operation to cell；
When monomer voltage is more than or equal to the first preset reference voltage, lower limit comparison circuit output control voltage, the first error
It is defeated after the branch pressure voltage relative error amplification that amplifying circuit exports the control voltage of lower limit comparison circuit with the first reference circuit
Go out, driving switch element ON operation, current path is provided for balancing element.
The comparison of above-mentioned linearity control circuit and driving saddlebag contain：
Linearity control circuit receives cell sampled voltage and the second preset reference voltage of the second reference circuit output
It is compared；
When cell sampled voltage is less than the second preset reference voltage, linearity control circuit output cell sampling electricity
The reference given voltage as the second error amplifying circuit is pressed, the second error amplifying circuit will refer to given voltage and the second benchmark
The branch pressure voltage of circuit output exports after being compared error amplification, balancing element under current conductive state by driving work,
The electric current in loop where cell is started from scratch change, the electricity of cell is followed by reference to given voltage control electric current
Press linear change；
When cell sampled voltage is more than or equal to the second preset reference voltage, the second default base of linearity control circuit output
Reference given voltage of the quasi- voltage as the second error amplifying circuit, the second error amplifying circuit will refer to given voltage and second
The branch pressure voltage of reference circuit output exports after being compared error amplification, and driving balancing element works in constant current state, monomer
Battery is operated in constant current equilibrium state.
Above-mentioned balancing element corresponds to operating current when working in constant current state be Imax1, when operating current rises to
Imax2, Imax2 ＞ Imax1, then current-limiting control circuit driving switch element be operated in limited current state, balancing element and monomer electricity
Loop where pond enters current limliting equilibrium state.
Compared with prior art, its advantage exists for lithium-ions battery group cell equalizing circuit and equalization methods of the present invention
In the present invention promotes each monomer voltage of battery pack to tend to be balanced by Balance route, prevents in battery pack between cell
Voltage it is inconsistent caused by cell poor performance mutation it is big；
Present invention employs constant-current source circuit, by controlling the input voltage Linear Control output current of constant-current source circuit i.e.
Euqalizing current, can efficiently solve triode multiplication factor occur temperature drift caused by current drift problem, solve by work temperature
The influence of parameter drift, realizes equalization function caused by degree change；
Circuit of the present invention is simple, be easily achieved modularization, reliability is high, control accuracy is accurate, flies especially suitable for space
Row device balanced device control device.
Brief description of the drawings
Fig. 1 is the module map of lithium-ions battery group cell equalizing circuit of the present invention；
Fig. 2 is the schematic diagram of lithium-ions battery group cell equalizing circuit of the present invention；
Fig. 3 is the flow chart of the equalization methods of lithium-ions battery group cell equalizing circuit of the present invention；
Fig. 4 is lithium-ions battery group cell euqalizing current curve map of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is further illustrated.
As shown in figure 1, be the embodiment one of lithium-ions battery group cell equalizing circuit, the lithium-ions battery group
Cell equalizing circuit is connected in parallel on lithium-ions battery group cell both ends, and the equalizing circuit includes：Switch element Q1,
Weighing apparatus element Q2, power dissipation component R1, the first monomer voltage sample circuit U1, second comonomer voltage sampling circuit U2, current limliting control
Circuit U 3, the first drive circuit U5, linearity control circuit U4 and the second drive circuit U6 processed.
First monomer voltage sample circuit U1 inputs the positive pole of terminating monomer battery, for sampling monomer battery voltage, adopts
The monomer battery voltage signal output of sample output is to current-limiting control circuit U3.
Second comonomer voltage sampling circuit U2 inputs the positive pole of terminating monomer battery, for sampling monomer battery voltage, adopts
The monomer battery voltage signal output of sample output is to linearity control circuit U4.
Current-limiting control circuit U3 inputs termination the first monomer voltage sample circuit U1 and power dissipation component R1 and switch member
Between part Q1.Current-limiting control circuit U3 receives the monomer battery voltage of the first monomer voltage sample circuit U1 samplings, according to monomer
The control voltage of the size output control switch element Q1 working conditions of cell voltage is to the first drive circuit U5.First driving electricity
Road U5 inlet circuits connection current-limiting control circuit U3, receive the control voltage of current-limiting control circuit U3 outputs, driving switch member
Part Q1 working condition, realize the Current limited Control to equal power loop current.
Linearity control circuit U4 inputs termination second comonomer voltage sampling circuit U2 and power dissipation component R1 and balanced member
Between part Q2.Linearity control circuit U4 receives the monomer battery voltage of second comonomer voltage sampling circuit U2 samplings, according to monomer
The control voltage of the size output control balancing element Q2 of cell voltage working condition is to the second drive circuit U6.Second driving
The inlet circuit of circuit U 6 connects linearity control circuit U4, receives the control voltage of linearity control circuit U4 outputs, and driving is balanced
Element Q2 working condition, realize the Linear Control to equal power loop current.
Switch element Q1 and balancing element Q2 uses model 3DK38F NPN type triode, using two pipe series designs,
Control respectively, increase reliability.Power dissipation component R1 uses model RXG12-20W-0.51 Ω power dissipation resistance, and
And it is connected in series with switch element Q1 and balancing element Q2.Switch element Q1 colelctor electrode and the anode of cell connect, and open
Element Q1 emitter stage and balancing element Q2 collector series connection are closed, balancing element Q2 emitter stage is with power dissipation component R1's
One end concatenates, and the power dissipation component R1 other end and the negative terminal of cell connect.Switch element Q1, balancing element Q2, work(
Rate dissipative element R1 is connected into equal power loop with cell.
Based on reliability design, prevent balancing element Q2 short troubles from the shunting of cell high current, switch element occur
Q1 and balancing element Q2 tandem workings.Under normal work, switch element Q1 serves as on-off action, is provided for balancing element Q2 work
Current loop, the Balance route of lithium-ions battery group cell is realized by balancing element Q2.
As shown in Fig. 2 be the schematic diagram of lithium-ions battery group cell equalization circuit embodiments one, the circuit bag
Contain：Switch element Q1, balancing element Q2, power dissipation component R1, the first monomer voltage sample circuit U1, second comonomer voltage are adopted
Sample circuit U 2, current-limiting control circuit U3, the first drive circuit U5, linearity control circuit U4 and the second drive circuit U6.
Switch element Q1, balancing element Q2, power dissipation component R1 and cell are connected into equal power loop.Switch
Element Q1 colelctor electrode and the anode of cell connect, switch element Q1 emitter stage and balancing element Q2 colelctor electrode string
Connect, balancing element Q2 emitter stage concatenates with power dissipation component R1 one end, power dissipation component the R1 other end and monomer
The negative terminal connection of battery.Switch element Q1 and balancing element Q2 uses model 3DK38F NPN type triode, power dissipation member
Part R1 uses model RXG12-20W-0.51 Ω power dissipation resistance.
First monomer voltage sample circuit U1 includes operational amplifier N1, operational amplifier N1 model 7F124.The
The one monomer voltage sample circuit U1 positive pole of input terminating monomer battery and switch element Q1 colelctor electrode, for sampling monomer
Cell voltage, the monomer battery voltage signal output of output is sampled to current-limiting control circuit U3.
Second comonomer voltage sampling circuit U2 includes operational amplifier N7, operational amplifier N7 model 7F124.The
The two monomer voltage sample circuit U2 positive pole of input terminating monomer battery and switch element Q1 colelctor electrode, for sampling monomer
Cell voltage, the monomer battery voltage signal output of output is sampled to balancing control circuit U4.
Current-limiting control circuit U3 is included：First reference circuit 32, input the first reference circuit 32 of termination and the first monomer electricity
The lower limit comparison circuit 31 of sample circuit U1 output ends is pressed, and connects the first reference circuit 32 and the output end of lower limit comparison circuit 31
The first error amplifying circuit 33.
Lower limit comparison circuit 31 includes operational amplifier N2, voltage-regulator diode D1 and resistance R2, R3, wherein, operation amplifier
Device N2 model 7F124, voltage-regulator diode D1 model 2DW15A.
Operational amplifier N2 input positive terminal is connected with the first monomer voltage sample circuit U1 output ends, input negative terminal connection
First reference circuit 31, resistance R2 and R3 are connected in series, and shunt regulator diode D1, are electrically connected to the defeated of operational amplifier N2
Go out end.
Lower limit comparison circuit 31 is used for the first monomer voltage sample circuit U1 output voltage and a preset reference voltage
V1 compares, and when output voltage is less than the preset reference voltage V1, lower limit comparison circuit 31 exports no-voltage, when output voltage is big
In equal to preset reference voltage V1, the stable control voltage of the output of lower limit comparison circuit 31, control voltage is by front stage circuits
The burning voltage signal of voltage stabilizing partial pressure output is carried out, the output control voltage signal of lower limit comparison circuit 31 to the first error amplifies electricity
Road 33.
First reference circuit 32 includes reference voltage circuit N3, the resistance R4 and R5 being connected in series, operational amplifier N4 and
N6, reference voltage circuit N3 model AD584TH, operational amplifier N4 and N6 model 7F124.Operational amplifier N4 is just
Input connects reference voltage circuit N3 by resistance R4 connections reference voltage circuit N3, operational amplifier N6 positive input terminal.
First reference circuit 32 connects the negative input end of operational amplifier N2 in lower limit comparison circuit 31, for comparing to lower limit
Circuit 31 provides lower limit reference voltage（That is preset reference voltage V1）And the feedback input end to the first error amplifying circuit 33
Reference voltage is provided, reference voltage is to carry out partial pressure by voltage-reference and follow output by operational amplifier.
First error amplifying circuit 33 includes operational amplifier N5 and the resistance R6 and R7 being connected in series, operational amplifier N5
Model 7F124, the output of operational amplifier N5 positive input terminal circuit connection lower limit comparison circuit 31, negative input end passes through
Resistance R6 circuits connect the output of the first reference circuit 32.
First error amplifying circuit 33 is used to carry out with the feed back input voltage signal of its operational amplifier N5 input negative terminals
Relative error is amplified, and outputs signal to drive circuit U5, feed back input voltage signal comes from the output voltage of the first reference circuit 32
Obtained with the voltage superposition on power dissipation resistance R1.
First drive circuit U5 includes pliotron Q3, pliotron Q3 model 3DK3439.First driving electricity
Road U5 is used to be amplified driving switch element Q1 normal works to current-limiting control circuit U3 output signal.
Linearity control circuit U4 is included：Second reference circuit 42, input termination second comonomer voltage sampling circuit U2 outputs
The voltage selecting circuit 41 at end, and connect the second reference circuit 42 and the second error amplification electricity of the output end of voltage selecting circuit 41
Road 43.
Voltage selecting circuit 41 includes：Operational amplifier N8, N13, N9, N14, resistance R8, R9, R10, R11, circuit N10,
Reference voltage circuit N12；Operational amplifier N8, N13, N9, N14 model 7F124, circuit N10 model JC4066, benchmark
Potential circuit N12 models AD584TH.
Resistance R8, R9 are connected in series, and resistance R10, R11 are connected in series.Reference voltage circuit N12 is accessed by resistance R8 and transported
Amplifier N8 positive input terminal is calculated, and operational amplifier N13 positive input terminal is accessed by resistance R10, operational amplifier N8's
Output circuit concatenation operation amplifier N9 negative input end, operational amplifier N9 positive input terminal circuit connection second comonomer voltage
Sample circuit U2, operational amplifier N13 circuit of output terminal are connected to operational amplifier N14 positive input terminal, operational amplifier
N14 negative input termination operational amplifier N9 output end.Operational amplifier N9, N13, N14 and second comonomer voltage sample electricity
Road U2 is exported to circuit N10, and circuit N10 is exported to the second error amplifying circuit 43.
Voltage selecting circuit 41 is used to give input voltage signal to the second error amplifying circuit 43, and voltage selecting circuit is
Logic circuit is selected, when the cell sampled voltage of second comonomer voltage sampling circuit U2 samplings is less than preset reference voltage V2
（V2 ＞ V1）, selection output monomer battery voltage signal, when monomer battery voltage is more than or equal to predeterminated voltage V2, selection output is permanent
Fixed constant value voltage signal V2, voltage selecting circuit are exported to error amplifying circuit 43.
Second reference circuit 42 includes reference voltage circuit N15, resistance R12, the R13 being connected in series, operational amplifier
N16, the resistance R14 and R15 being connected in series.Reference voltage circuit N15 model AD584TH, operational amplifier N16 model
For 7F124.
Reference voltage circuit N15 output ends are connected to operational amplifier N16 positive input terminal by resistance R12 circuits, fortune
The output end for calculating amplifier N16 is connected to the negative input end of the second error amplifying circuit 43 by resistance R14 circuits.
Second reference circuit 42 is used to provide reference voltage, and reference voltage and resistance R1 voltage superposition simultaneously pass through resistance
R14, R15 partial pressure, voltage division signal are exported to the second error amplifying circuit 43.
Second error amplifying circuit 43 includes operational amplifier N11 and resistance R14, R15 for being connected in series, operational amplifier
N11 model 7F124.
Circuit N10 output, negative input end pass through resistance in operational amplifier N11 positive inputs termination voltage selecting circuit 41
R14 connects the output end of operational amplifier N16 in the second reference circuit 42.
Second error amplifying circuit 43 is used to put the given reference signal error compared with feedback voltage signal of input
Greatly, export to the second drive circuit U6, regulation balancing element Q2 driving current, for amplifying driving rear class to current signal
Balancing element Q2 normal works, electricity of the feedback voltage signal from the output voltage of the second reference circuit 42 Yu power dissipation resistance R1
Laminated adduction is obtained by resistance R14, R15 partial pressure.
Second drive circuit U6 includes triode Q4, triode Q4 model 3DK3439.Second drive circuit U6 is used
Driving balancing element Q2 normal works are amplified in the output signal to linearity control circuit U4.
As shown in figure 3, for a kind of equalization methods of lithium-ions battery group cell equalization circuit embodiments one, this is equal
Weighing apparatus method specifically comprises the steps of：
S1, the first monomer battery voltage sample circuit U1 and second comonomer battery voltage sampling circuit U2 are respectively to monomer electricity
Pond is sampled.
First monomer battery voltage sample circuit U1 exports cell sampled voltage to current-limiting control circuit U3
Limit comparison circuit 31.
Second comonomer battery voltage sampling circuit U2 exports cell sampled voltage to linearity control circuit U4 electricity
Press selection circuit 41.
S2, lower limit comparison circuit 31 are by cell sampled voltage and the preset reference voltage from the first reference circuit 31
V1 is compared, and judges whether cell sampled voltage is less than preset reference voltage V1；If so, work as cell sampled voltage
Less than preset reference voltage V1, lower limit comparison circuit 31 exports no-voltage；If it is not, when cell sampled voltage is more than or equal in advance
If reference voltage V 1, lower limit comparison circuit 31 exports a default control voltage signal, the output control of lower limit comparison circuit 31 electricity
Signal is pressed to the first error amplifying circuit 33.
Voltage selecting circuit 41 is selection logic circuit, and voltage choosing is determined according to the cell sampled voltage size of input
The output voltage of circuit is selected, judges whether cell sampled voltage is less than preset reference voltage V2；If so, when cell is adopted
Sample voltage is less than preset reference voltage V2, exports cell sampled voltage；If it is not, when cell sampled voltage is more than or equal to
Preset reference voltage V2, exports constant voltage V2, and voltage selecting circuit 41 outputs signal to the second error amplifying circuit 43.
Power dissipation component R1 voltage is superimposed and led to the operational amplifier N6 of the first reference circuit 32 output voltage
Cross feedback input end of the electric resistance partial pressure to the first error amplifying circuit 33
Output voltage of the other power dissipation component R1 voltage also with the operational amplifier N16 of the second reference circuit 42 is folded
Adduction gives the feedback input end of the second error amplifying circuit 43 by electric resistance partial pressure.
S3, the first error amplifying circuit 33 are compared the voltage of the output voltage of lower limit comparison circuit 31 and feedback input end
Amplify compared with error, by the first drive circuit U5 driving switch elements Q1.
When cell sampled voltage is less than preset reference voltage V1, lower limit comparison circuit 31 exports no-voltage, and first misses
Poor amplifying circuit 33 exports no-voltage, and switch element Q1 is off.
When cell sampled voltage is more than preset reference voltage V1, lower limit comparison circuit 31 exports default control voltage,
The error amplification output driving switch element Q1 conductings compared with feed back input voltage by the first error amplifying circuit 33, it is
Balancing element Q2 work provides closed-loop path.
Second error amplifying circuit 43 misses the output voltage of voltage selecting circuit 41 compared with feed back input voltage
Difference amplification, the second error amplifying circuit 43 and the second drive circuit U6, balancing element Q2, power dissipation component R1, the second benchmark
Circuit 42 constitutes constant-current source circuit, the output voltage control balancing element Q2 of voltage selecting circuit 41 working condition.
When cell sampled voltage is less than preset reference voltage V1, then the second error amplifying circuit 42 output no-voltage is believed
Number, balancing element Q2 does not work, and cell is unbalanced.
Preset reference voltage V1 and be less than preset reference voltage V2 when cell sampled voltage is more than or equal to, then the second mistake
The poor output control voltage of amplifying circuit 42, balancing element Q2 ON operations are controlled, now cell sampled voltage and balanced member
Part Q2 conducting electric currents are linear.
When cell sampled voltage is more than or equal to preset reference voltage V2, then voltage selecting circuit 41 exports constant voltage
V2, control balancing element Q2 are operated in constant current state.
Other detailed contents of the equalization methods embodiment one for details, reference can be made to the equilibrium of lithium-ions battery group cell
The appropriate section of circuit embodiments, will not be repeated here.In the present embodiment, equalizing circuit is connected in parallel on cell both ends, works as list
Body battery sampling voltage is less than preset reference voltage V1, and monomer is unbalanced；When cell sampled voltage is more than or equal to default base
Quasi- voltage V1 and it is less than preset reference voltage V2, Balance route is carried out to cell；When cell sampled voltage is more than
Equal to preset reference voltage V2, cell enters constant current equilibrium state.By Balance route, prevent between each monomer of battery pack
There is inconsistency, influence battery life.A kind of lithium-ions battery group cell equalizing circuit tool provided by the invention
Have that control logic is simple, reliability is high, is easily achieved modular feature.
As shown in figure 4, it is a kind of lithium-ions battery group cell equalizing circuit and the tool of equalization methods embodiment two
Body explanation：
The realization of Current limited Control：
First monomer voltage sample circuit U1 sample battery monomer voltages, it is sent into lower limit comparison circuit 31 and reference circuit
1 operational amplifier N4 output voltages are compared, and the output voltage of lower limit comparison circuit 31 is as the first error amplifying circuit 33
Given reference voltage, and compared with the branch pressure voltage between resistance R6, R7 error amplify, between resistance R6, R7 point
Piezoelectricity pressure is obtained by the operational amplifier N6 output voltages of the first reference circuit 32 and power dissipation resistance R1 voltage superposition, by mistake
The poor output of amplifying circuit 31 carries out Current amplifier driving switch element Q1 by the first drive circuit U5（Triode Q1）Work, the
The output of one error amplifying circuit 33 determines switch element Q1 working condition, and switch element Q1 has following working condition：
1）When cell sampled voltage is less than preset reference voltage V1, lower limit comparison circuit output no-voltage, error is put
Big circuit 1 exports no-voltage, and switch element Q1 is not turned on, and monomer equilibrium does not work；
2）When cell sampled voltage is more than or equal to preset reference voltage V1, the output control of lower limit comparison circuit 31 electricity
Pressure, the output control voltage of the first error amplifying circuit 33, driving switch element Q1 ON operations, electric current is provided for balancing element Q2
Path, the size of operating current is determined by balancing element Q2 working condition, is illustrated in the realization of following Balance routes.
The realization of Balance route：
Second comonomer voltage sampling circuit U2 sampling cell sampled voltages are sent into voltage selecting circuit 41, voltage selection
Circuit 41 is selection logic circuit, and when cell sampled voltage is less than preset reference voltage V2, then voltage selecting circuit 41 is defeated
Go out cell sampled voltage, when cell sampled voltage is more than or equal to preset reference voltage V2, then voltage selecting circuit 41
Export constant voltage values V2.
Reference given voltage of the output as the second error amplifying circuit 43 of voltage selecting circuit 41, with resistance R14,
Branch pressure voltage between R15 is compared error amplification, and the branch pressure voltage between resistance R14, R15 is by the second reference circuit 42
Operational amplifier N16 output voltages and power dissipation resistance R1 voltage superposition obtain；When given reference voltage is less than default base
Quasi- voltage V1, balancing element Q2 do not work, i.e., balanced not work；When given reference voltage is more than or equal to preset reference voltage V1,
Balancing element Q2 is started working, and electric current is started from scratch change, euqalizing current can be controlled to follow electric power storage by giving reference voltage
Pond monomer voltage linear change, when given reference voltage reaches a pre-set constant value, balancing element Q2 is operated in constant current state, i.e.,
Constant current equilibrium state.
Compared with prior art, constant-current source circuit is employed in the present invention, by the input voltage for controlling constant-current source circuit
Linear Control output current is euqalizing current, and solves the influence of the parameter drift as caused by temperature change, preferably
Ground realizes equalization function.
Second reference circuit 42 and the second error amplifying circuit 43, drive circuit U6, balancing element Q2, resistance R1, resistance
R14, resistance R15 constitute constant-current source circuit.Equal power loop current I and the linear pass of voltage selecting circuit output voltage
System, voltage selecting circuit output voltage control equal power loop current.Combining constant-current source circuit by voltage selecting circuit 41 can
Know, when cell sampled voltage is less than preset reference voltage V2 and is less than preset reference voltage V1（V2＞ V1）, voltage selection
Monomer voltage signal of the output of circuit 41 less than preset reference voltage V1, equilibrium do not work；When cell sampled voltage is less than
Preset reference voltage V2 and it is more than or equal to preset reference voltage V1, the output of voltage selecting circuit 41 is more than preset reference voltage V1
Monomer battery voltage signal, here equal power loop current size controlled by monomer battery voltage signal and linear change therewith
Change；When cell sampled voltage is more than or equal to preset reference voltage V2, voltage selecting circuit exports constant value voltage signal V2, this
When equal power loop current enter constant current state.
When voltage selecting circuit exports constant value voltage signal V2, equal power loop enters constant current state, balancing element Q2
Operating current corresponding with cell is Imax1, and the size of operating current is determined by balancing element Q2 working condition here
It is fixed, if because failure and other reasons cause equal power loop works electric current to increase to Imax2, Imax2 ＞ Imax1, then by limiting
Flow control circuit U3 controlling switch elements Q1 is operated in limited current state, and equal power loop enters current limliting equilibrium state.
Triode multiplication factor can be efficiently solved using constant-current source circuit current drift problem caused by temperature drift occurs, only
Ensure the second reference circuit 42, resistance R1, R14, R15 parameter stability, current drift problem caused by temperature drift will not occur.
The circuit of the present invention is simple, be easily achieved modularization, reliability is high, control accuracy is accurate, equal especially suitable for spacecraft
Weighing apparatus control device.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, due to corresponding to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think beyond the scope of this invention.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of lithium-ions battery group cell equalizing circuit, it is characterised in that the equalizing circuit is connected in parallel on cell
Both ends, the equalizing circuit include：
Switch element, balancing element, the power dissipation component being connected in series, it is connected in parallel on cell both ends；
First monomer voltage sample circuit, its inlet circuit connection cell positive pole, is sampled to monomer battery voltage；
Current-limiting control circuit, its inlet circuit connect the first monomer voltage sample circuit, and switch element and power dissipation
Between element；According to the control voltage of the size output control switch element manipulation state of cell sampled voltage；
First drive circuit, its inlet circuit connection current-limiting control circuit, output termination switch element triggering end, according to current limliting
Loop is turned on or off where the control voltage controlling switch element and balancing element of control circuit；
Second comonomer voltage sampling circuit, its inlet circuit connection cell positive pole, is sampled to monomer battery voltage；
Linearity control circuit, its inlet circuit connection second comonomer voltage sampling circuit, and balancing element and power dissipation
Between element；According to the control voltage of the working condition of the size output control balancing element of cell sampled voltage；
Second drive circuit, its inlet circuit connection linearity control circuit, output termination balancing element triggering end, according to linear
The working condition of the control voltage control balancing element of control circuit, to cell Balance route.
2. lithium-ions battery group cell equalizing circuit as claimed in claim 1, it is characterised in that the Current limited Control
Circuit includes：
First reference circuit, it exports the first preset reference voltage；
Lower limit comparison circuit, it receives the cell sampled voltage of the first monomer voltage sampling circuit samples and the first default base
Quasi- voltage is compared, when cell sampled voltage is more than or equal to the first preset reference voltage, output switch element conductive
Control voltage；
First error amplifying circuit, it receives the control voltage of lower limit comparison circuit output, point with the output of the first reference circuit
Piezoelectricity pressure relative error amplification, is exported to the first drive circuit.
3. lithium-ions battery group cell equalizing circuit as claimed in claim 1, it is characterised in that the Linear Control
Circuit includes：
Second reference circuit, it exports the second preset reference voltage；
Voltage selecting circuit, it receives the cell sampled voltage of second comonomer voltage sampling circuit sampling and the second default base
Quasi- voltage is compared, when cell sampled voltage is less than the second preset reference voltage, voltage selecting circuit output monomer electricity
Pond sampled voltage is as control voltage, when cell sampled voltage is more than or equal to the second preset reference voltage, voltage selection electricity
Road exports the second preset reference voltage as control voltage；
Second error amplifying circuit, the control voltage of its receiving voltage selection circuit, the partial pressure electricity with the output of the second reference circuit
Relative error amplification is pressed, is exported to the second drive circuit.
4. lithium-ions battery group cell equalizing circuit as claimed in claim 1, it is characterised in that the switch element
It is NPN type pliotron with balancing element.
5. lithium-ions battery group cell equalizing circuit as claimed in claim 3, it is characterised in that second error
Amplifying circuit, the second drive circuit, balancing element, power dissipation component, and the second error amplifying circuit branch pressure voltage are negative
Carry resistance and form constant-current source circuit.
A kind of 6. lithium-ions battery group cell equalizing circuit described in any one claim in claim 1 to 5
Equalization methods, it is characterised in that the equalization methods include：
Current-limiting control circuit compares cell sampled voltage and the first preset reference voltage, when cell sampled voltage is more than
Equal to the first preset reference voltage, by the first drive circuit driving switch element ON operation, electric current is provided for balancing element
Path；
Linearity control circuit compares cell sampled voltage and the second preset reference voltage, when cell sampled voltage is less than
Second preset reference voltage, balancing element carry out balanced operation under ON operation state to cell；When cell is adopted
Sample voltage is more than or equal to the second preset reference voltage, and balancing element is in constant current equilibrium state with cell；
The first preset reference voltage is less than the second preset reference voltage.
7. equalization methods as claimed in claim 6, it is characterised in that the cell sampled voltage is less than the first default base
Quasi- voltage, current-limiting control circuit turn on without output, not driving switch element, and balancing element does not work.
8. equalization methods as claimed in claim 7, it is characterised in that the comparison of the current-limiting control circuit and driving saddlebag
Contain：
Lower limit comparison circuit receives cell sampled voltage and the first preset reference voltage of the first reference circuit output is carried out
Compare；
When cell sampled voltage is less than the first preset reference voltage, lower limit comparison circuit output no-voltage, the first error is put
Big circuit is not turned on without output, switch element, and balancing element does not carry out balanced operation to cell；
When monomer voltage is more than or equal to the first preset reference voltage, lower limit comparison circuit output control voltage, the amplification of the first error
Circuit exports after the branch pressure voltage relative error that the control voltage of lower limit comparison circuit exports with the first reference circuit is amplified, and drives
Dynamic switching elements conductive work, current path is provided for balancing element.
9. equalization methods as claimed in claim 6, it is characterised in that the comparison of the linearity control circuit and driving saddlebag
Contain：
Linearity control circuit receives cell sampled voltage and the second preset reference voltage of the second reference circuit output is carried out
Compare；
When cell sampled voltage is less than the second preset reference voltage, linearity control circuit output cell sampled voltage is made
For the reference given voltage of the second error amplifying circuit, the second error amplifying circuit will refer to given voltage and the second reference circuit
The branch pressure voltage of output exports after being compared error amplification, and balancing element, by driving work, makes list under current conductive state
The electric current in loop where body battery is started from scratch change, and the pressure-wire of cell is followed by reference to given voltage control electric current
Property change；
When cell sampled voltage is more than or equal to the second preset reference voltage, linearity control circuit exports the second preset reference electricity
The reference given voltage as the second error amplifying circuit is pressed, the second error amplifying circuit will refer to given voltage and the second benchmark
The branch pressure voltage of circuit output exports after being compared error amplification, and driving balancing element works in constant current state, cell
It is operated in constant current equilibrium state.
10. equalization methods as claimed in claim 9, it is characterised in that the balancing element works in corresponding during constant current state
Operating current is Imax1, when operating current rises to Imax2, Imax2 ＞ Imax1, then current-limiting control circuit driving switch element
Limited current state is operated in, balancing element enters current limliting equilibrium state with loop where cell.
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| CN111781506B (en) * | 2020-05-26 | 2023-02-03 | 上海空间电源研究所 | High-precision adjustable lithium battery cell voltage control circuit |
| CN112039169A (en) * | 2020-09-22 | 2020-12-04 | 上海空间电源研究所 | Automatic equalization circuit of single storage battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195314A (en) * | 2010-03-09 | 2011-09-21 | 凹凸电子（武汉）有限公司 | Circuit and method for balancing battery cells |
| CN104237806A (en) * | 2014-10-20 | 2014-12-24 | 上海空间电源研究所 | Voltage sampling device, system and method of battery cell of lithium-ion battery pack |
| CN105071497A (en) * | 2015-08-28 | 2015-11-18 | 中国电子科技集团公司第十八研究所 | Lithium ion storage battery intelligent equalization module |
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| JP5350067B2 (en) * | 2009-04-28 | 2013-11-27 | 本田技研工業株式会社 | Power system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195314A (en) * | 2010-03-09 | 2011-09-21 | 凹凸电子（武汉）有限公司 | Circuit and method for balancing battery cells |
| CN104237806A (en) * | 2014-10-20 | 2014-12-24 | 上海空间电源研究所 | Voltage sampling device, system and method of battery cell of lithium-ion battery pack |
| CN105071497A (en) * | 2015-08-28 | 2015-11-18 | 中国电子科技集团公司第十八研究所 | Lithium ion storage battery intelligent equalization module |
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