CN106786879A - Battery pack charge control method and charging assembly - Google Patents
Battery pack charge control method and charging assembly Download PDFInfo
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- CN106786879A CN106786879A CN201611190101.5A CN201611190101A CN106786879A CN 106786879 A CN106786879 A CN 106786879A CN 201611190101 A CN201611190101 A CN 201611190101A CN 106786879 A CN106786879 A CN 106786879A
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- Prior art keywords
- battery
- voltage
- battery pack
- charging
- pressure difference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a kind of battery pack charge control method, comprise the following steps：In battery pack charging process, pressure difference in battery pack between each cell voltage or/and battery to be balanced is compared with corresponding threshold voltage respectively, reach corresponding threshold pressure differential when wherein at least one cell voltage reaches the pressure difference between its corresponding threshold voltage or/and battery to be balanced, then open euqalizing current to reach respective threshold voltage battery discharge or to reach the high-voltage battery in threshold pressure differential electric discharge；In euqalizing current discharge process, by controlling the alternate conduction of charge switch and ending to reduce the average current of charging；Or, increase the pressure drop on charge switch, it is operated in linear model, to reduce charging current；It is reduced within corresponding threshold pressure differential until cell voltage to be decreased below the pressure difference between its corresponding threshold voltage or/and battery to be equalized.
Description
Technical field
The present invention relates to battery boosting technology field, more particularly to a kind of battery pack charge control method and charging assembly.
Background technology
Battery pack is typically composed in series by several batteries.In order to extend battery life, battery is entered in charge and discharge process
Row is balanced, so including battery equalizing circuit and battery balanced switch in battery-charging assembly.In order to battery in discharge and recharge
Protected in journey, there is charge switch M1 and discharge switch M2 in charging assembly respectively.Battery pack as shown in Figure 1 is by two economize on electricitys
Pond is in series, the voltage on battery equalizing circuit U1 sampling batteries 1 and battery 2, when the voltage of the voltage versus cell 2 of battery 1
Certain value high, then battery equalizing circuit produce the control signal G1 to turn on switch K1, reduce to the charging current of battery 1, battery
Equalizing circuit generation control signal G2 turns off switch K2, and the charging current to battery 2 keeps constant；When the voltage ratio of battery 2
The voltage certain value high of battery 1, then battery equalizing circuit produce the control signal G1 to turn off switch K1, to the charging of battery 1 electricity
Stream keeps constant, and battery equalizing circuit generation control signal G2 turns on switch K2, reduces the charging current to battery 2；Work as electricity
In certain value, then battery equalizing circuit generation control signal G1 and G2 make switch K1 and K2 to the voltage difference of pond 1 and battery 2
Shut-off, the charging current to battery 1 and battery 2 all keeps constant.
In normal charge and discharge process, charge switch M1 and discharge switch M2 are turned on.When battery equalizing circuit is detected
Charging process has exception, and such as battery overvoltage, charging current excessively stream then controls charge switch M1 shut-offs.
Because the internal resistance between battery has differences, initial voltage has differences, in charge and discharge process, using above-mentioned side
Formula is still unable to reach equilibrium in some cases.Such as in charging process, charging current than it is larger when, due to battery sheet
Difference between body, the then voltage of the voltage higher than battery 1 of battery 2, battery equalizing circuit controlling switch K2 conductings.Even if battery
1 charging current is more than the charging current of battery 2, and the voltage of battery 2 is still above the voltage of battery 1.When battery 2 is first full of
Afterwards, then in order to prevent battery 2 from overcharging, battery equalizing circuit control charge switch M1 shut-offs.Now, it is impossible to ensure the electricity of battery 1
Pressure has reached the battery 2 of battery 1 voltage in a balanced way, therefore cannot ensure to reach equilibrium state.
The content of the invention
The present invention provides a kind of battery pack charge control method and charging assembly, it is therefore intended that make some electricity in battery pack
Pond reaches equilibrium, it is to avoid the battery in battery pack there is a problem of overcharging.
To solve the above problems, the embodiment of the present invention provides a kind of battery pack charge control method, comprises the following steps：
In battery pack charging process, in battery pack each cell voltage or/and it is to be equalized between pressure difference respectively with accordingly
Threshold voltage be compared, when wherein at least one cell voltage reaches its corresponding threshold voltage or/and electricity to be equalized
Pressure difference between pond reaches corresponding threshold pressure differential, then open euqalizing current to reaching the battery discharge of respective threshold voltage or right
Reach the high-voltage battery electric discharge in threshold pressure differential；
In euqalizing current discharge process, by controlling the alternate conduction of charge switch and ending to reduce the average of charging
Electric current；Or, increase the pressure drop on charge switch, it is operated in linear model, to reduce charging current；Until battery is electric
The pressure difference that decreases below between its corresponding threshold voltage or/and battery to be equalized of pressure be reduced to corresponding threshold pressure differential it
It is interior.
Used as a kind of implementation method, after euqalizing current is produced, whether continuation judges wherein at least one cell voltage
Whether the pressure difference reached between its corresponding threshold voltage or/and battery to be equalized reaches corresponding threshold pressure differential；
When its maximum current is reached in euqalizing current, above-mentioned threshold voltage condition or/and pressure differential is still reached；
Then opened with reducing the average current of charging or increasing charging with cut-off by controlling the alternate conduction of charge switch
The pressure drop of pass, makes it be operated in linear model, to reduce charging current.
As a kind of implementation method, in battery pack charging process, the state of charge of battery pack is detected, when battery pack is not filled
Man Shi, then using constant current charging mode；When battery pack is full of soon, then using constant-voltage charge pattern.
As a kind of implementation method, in battery pack charging process, the state of charge of battery pack is detected, when battery pack is not filled
Man Shi, then using constant current charging mode；
When its maximum current is reached in euqalizing current, wherein at least one cell voltage still reaches its corresponding threshold voltage
Or/and the pressure difference between battery to be equalized is when still reaching corresponding threshold pressure differential, then the control terminal voltage of charge switch is adjusted, made
It is operated in saturation region；After the total voltage of pressure drop on battery voltage and charge switch is increased to preset value, then constant current is exited
Charge mode, into constant-voltage charge pattern so that cell voltage decreases below its corresponding threshold voltage or/and to be equalized
Pressure difference between battery is reduced within corresponding threshold pressure differential.
Used as a kind of implementation method, described battery pack is not full of and the battery pack is full of and passes through battery pack and fill soon
Whether the total voltage of electric switch pressure drop reaches the preset value to judge；When the total voltage is less than the preset value, then judge
Battery pack is not full of；When the total voltage reaches the preset value, then judge that battery pack is full of soon.
To solve the above problems, the embodiment of the present invention provides a kind of charging assembly, including：
Equalizing circuit, couples battery pack, the pressure in sampling battery group between each cell voltage or/and battery to be equalized
Difference, and be compared with corresponding threshold value respectively；When wherein at least one cell voltage reach its corresponding threshold voltage or/and
When pressure difference between battery to be equalized reaches corresponding threshold pressure differential, then euqalizing current is opened to reaching the electricity of respective threshold voltage
Tank discharge discharges reaching the high-voltage battery in threshold pressure differential, the output end coupling charge switch of the equalizing circuit
Control end；
Charge switch, its control end couples the equalizing circuit, in euqalizing current discharge process, is opened by controlling charging
The alternate conduction of pass, with the pressure drop on the average current or increase charge switch that reduce charging, makes it be operated in linearly with cut-off
Pattern, to reduce charging current.
Used as a kind of implementation method, described equalizing circuit includes logic circuit and comparator, the comparator with it is described
Sampled signal obtained by pressure difference in sampling battery group between each cell voltage or/and battery to be equalized is corresponded and set
Put, the comparator includes first input end, the second input and output end, its first input end receives the sampled signal,
Its second input receives corresponding with the sampled signal and for characterizing the threshold voltage or threshold pressure differential reference to be believed
Number, the output end of multiple comparators couples the logic circuit, and the output end of the logic circuit couples the control of charge switch
End processed.
Used as a kind of implementation method, described equalizing circuit includes pull-up circuit or pull-down circuit, operational amplifier and two
Pole pipe, the operational amplifier and diode with each cell voltage or/and battery to be equalized in the sampling battery group
Between pressure difference obtained by sampled signal correspond set, the operational amplifier include first input end, second input
End and output end, its first input end receive the sampled signal, and its second input receives corresponding with the sampled signal
And for characterizing the reference signal of the threshold voltage or threshold pressure differential, the output end of the operational amplifier couples corresponding two pole
One end of pipe, the other end of diode couples the pull-up circuit or pull-down circuit, the pull-up circuit or pull-down circuit with
The common port of diode couples the control end of charge switch.
Used as a kind of implementation method, described sampled signal is controlled and for characterizing by by respective battery voltage or pressure difference
The voltage controlled voltage source of respective battery voltage or pressure difference.
Used as a kind of implementation method, it is corresponding that the operational amplifier judges whether wherein at least one cell voltage reaches its
Threshold voltage or/and battery to be equalized between pressure difference whether reach corresponding threshold pressure differential, if judgement reach above-mentioned threshold value
Voltage conditions or/and pressure differential, then corresponding diode current flow, so as to change the voltage of the control end of charge switch, makes it
Linear model is operated in, to reduce charging current.
Brief description of the drawings
Fig. 1 is the circuit diagram of the charging circuit of prior art；
Fig. 2 is the structure chart of charging assembly embodiment three of the present invention；
Fig. 3 is the structure chart of charging assembly example IV of the present invention；
Fig. 4 is the structure chart of charging assembly embodiment five of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the technical characteristic above-mentioned and other to the present invention and advantage are clearly and completely described,
Obviously, described embodiment is only section Example of the invention, rather than whole embodiments.
In embodiments of the present invention, can be with any appropriate combination and/or sub-portfolio by specific feature, structure or spy
Property combination in one or more embodiments or example.It should be understood by one skilled in the art that accompanying drawing is all provided herein
It is that for illustrative purposes, and accompanying drawing is not necessarily drawn to scale.It should be appreciated that when title element " being couple to " or " even
Be connected to " another element when, it can be directly coupled to another element or there may be intermediary element.Conversely, when title element
During " being directly coupled to " or " being directly connected to " another element, then in the absence of intermediary element.Term "and/or" bag used herein
Include any and all combination of the project that one or more correlations are listed.A kind of battery pack charge control method, including following step
Suddenly：
S100：In battery pack charging process, in battery pack each cell voltage or/and it is to be equalized between pressure difference respectively with
Corresponding threshold voltage is compared, when wherein at least one cell voltage reaches its corresponding threshold voltage or/and to be equalized
Battery between pressure difference reach corresponding threshold pressure differential, then open euqalizing current to reach respective threshold voltage battery discharge or
Person is to reaching the electric discharge of the high-voltage battery in threshold pressure differential；
S101：In euqalizing current discharge process, by controlling the alternate conduction of charge switch and ending to reduce charging
Average current or increase pressure drop on charge switch, it is operated in linear model, to reduce charging current, until by electricity
The pressure difference that cell voltage is decreased below between its corresponding threshold voltage or/and battery to be equalized is reduced to corresponding threshold pressure differential
Within.
In battery pack charging process, the state of charge of battery pack is detected, when battery pack is not full of, the voltage of battery pack
It is low, then using constant current charging mode；When battery pack is full of soon, battery voltage is high, then using constant-voltage charge pattern.Battery pack
Without full of and battery pack soon full of by battery voltage, charge switch and whether the total voltage of pressure drop reaches on discharge switch
Preset value judges；If total voltage is less than preset value, judge that battery pack is not full of；If total voltage reaches preset value,
Then judge that battery pack is full of soon.
Wherein, threshold voltage and threshold pressure differential can be definite value or the different value for different batteries.Above-mentioned method is filled
Electric switch is controlled and euqalizing current discharges and carries out simultaneously, i.e., can be carried out charge switch when not reaching euqalizing current maximum also
Control.
The condition for opening euqalizing current has three：One is that at least one cell voltage reaches its corresponding threshold value in battery pack
Voltage；Two is that pressure difference between battery to be equalized reaches corresponding threshold pressure differential；Three is that condition one and two meets simultaneously, above-mentioned three
Individual condition meets any one.The mode of euqalizing current discharge process has two kinds：One is the friendship by controlling charge switch
For turning on and end；Two is to increase the pressure drop on charge switch, it is operated in linear model, and above two mode is capable of achieving
If the dry cell in battery pack reaches equilibrium.
According to different condition, any one mode and acquisition result corresponding with condition is to be capable of achieving in selection two ways
It is battery balanced.When at least one cell voltage reaches its corresponding threshold voltage in battery pack, cell voltage is reduced to low
It is to be capable of achieving battery equilibrium in its corresponding threshold voltage；When the pressure difference between battery to be equalized reaches corresponding threshold pressure differential
When, the pressure difference between battery to be equalized is reduced within corresponding threshold pressure differential and is capable of achieving battery equilibrium；Meet when simultaneously
The pressure difference that at least one cell voltage is reached between its corresponding threshold voltage and battery to be equalized in battery pack reaches accordingly
During threshold pressure differential, then cell voltage must be decreased below between its corresponding threshold voltage and battery to be equalized simultaneously
Pressure difference is reduced within corresponding threshold pressure differential and is just capable of achieving balance.
Although the condition for opening euqalizing current is different, the technical scheme of its solve problem is roughly the same with principle, below
When some embodiments are expanded on further to battery pack charge control method of the present invention, then with cell voltage and its corresponding threshold value
Voltage is described.
Need it is to be noted that：The euqalizing current from be by the discharge current of discharge switch it is different, for electric discharge open
The effect of pass is the switch that control of discharge is carried out in battery pack supplying power for outside, thus discharge switch discharge current and the present invention
Technical problem the no direct correlation of solution, discharge switch is fully on state in charging process, therefore is said herein
It is bright.
Embodiment one
A kind of battery pack charge control method, comprises the following steps：
S200：In battery pack charging process, each cell voltage is compared with corresponding threshold voltage respectively in battery pack
Compared with when wherein at least one cell voltage reaches its corresponding threshold voltage, then unlatching euqalizing current is to reaching respective threshold electricity
The battery discharge of pressure；
S201：After euqalizing current is produced, it is corresponding that continuation judges whether wherein at least one cell voltage reaches its
Threshold voltage, when its maximum current is reached in euqalizing current, still reaches above-mentioned threshold voltage condition, then by controlling to charge
The alternate conduction of switch and cut-off to reduce the average current of charging, until cell voltage is decreased below into its corresponding threshold value
Voltage.
In this embodiment, when threshold voltage condition (but can also be meet threshold pressure differential condition or simultaneously meet two
Condition, if hereafter there is identical description, represent meet in threshold voltage condition, threshold pressure differential condition any one and
Meet above-mentioned two condition simultaneously) when meeting, then open euqalizing current and discharged, but now control charging is opened
Close, only when euqalizing current reaches maximum current and cell voltage reaches maximum current and meets threshold voltage bar in euqalizing current
Part (whether at least one cell voltage reaches its corresponding threshold voltage i.e. in battery pack), just controls the alternating of charge switch to lead
It is logical make with cut-off it is battery balanced.
Embodiment two
A kind of battery pack charge control method, comprises the following steps：
S300：In battery pack charging process, each cell voltage is compared with corresponding threshold voltage respectively in battery pack
Compared with when wherein at least one cell voltage reaches its corresponding threshold voltage, then unlatching euqalizing current is to reaching respective threshold electricity
The battery discharge of pressure；
S301：In euqalizing current discharge process, by increasing the pressure drop on charge switch, it is set to be operated in linear mould
Formula, to reduce charging current, until cell voltage is decreased below into its corresponding threshold voltage.
In battery pack charging process, the state of charge of real-time detection battery pack, when battery pack is not full of, then using perseverance
Current charge pattern.When its maximum current is reached in euqalizing current, above-mentioned threshold voltage condition is still reached, then adjust charging and open
The control terminal voltage of pass, makes it be operated in saturation region.When battery voltage (the voltage summation in battery pack per batteries), charge
After the total voltage of pressure drop is increased to preset value on switch and discharge switch, then constant current charging mode is exited, into constant-voltage charge mould
Formula so that cell voltage decreases below its corresponding threshold voltage.
A kind of charging assembly, including equalizing circuit and charge switch.
Equalizing circuit couples battery pack, the pressure in sampling battery group between each cell voltage or/and battery to be equalized
Difference, and it (is cell voltage when what is sampled, then by its corresponding voltage threshold of cell voltage to be compared with corresponding threshold value respectively
Value is compared；When sampling be battery to be equalized between pressure difference signal, then by its corresponding pressure difference threshold of pressure difference signal
Value is compared；When the cell voltage and pressure difference signal of sampling, then while being compared to its corresponding threshold value respectively)；When it
In the pressure difference that reaches between its corresponding threshold voltage or/and battery to be equalized of at least one cell voltage reach corresponding pressure difference
During threshold value, then euqalizing current is opened to reaching the battery discharge of respective threshold voltage or to reaching the high voltage in threshold pressure differential
Battery discharge, the output end of the equalizing circuit couples the control end of charge switch；
Charge switch, its control end coupling equalizing circuit, in euqalizing current discharge process, by controlling charge switch
Alternate conduction, with the pressure drop on the average current or increase charge switch that reduce charging, makes it be operated in linear mould with cut-off
Formula, to reduce charging current.
Sampled signal is to be controlled by respective battery voltage or pressure difference and for characterizing respective battery voltage or/and pressure difference
The voltage signal of voltage controlled voltage source, sampled signal in the examples below is illustrated with cell voltage.
Controlling the condition of charge switch has three：One is that at least one cell voltage reaches its corresponding threshold value in battery pack
Voltage；Two is that pressure difference between battery to be equalized reaches corresponding threshold pressure differential；Three is that condition one and two meets simultaneously, above-mentioned three
Individual condition meets any one.The working method of charge switch has two kinds：One is to control charge switch by equalizing circuit
Alternate conduction with cut-off；Two is to increase the pressure drop on charge switch by equalizing circuit, it is operated in linear model, above-mentioned
If the dry cell that two ways is capable of achieving in battery pack reaches equilibrium.
According to different condition, any one mode and acquisition result corresponding with condition is to be capable of achieving in selection two ways
It is battery balanced.When at least one cell voltage reaches its corresponding threshold voltage in battery pack, cell voltage is reduced to low
It is to be capable of achieving battery equilibrium in its corresponding threshold voltage；When the pressure difference between battery to be equalized reaches corresponding threshold pressure differential
When, the pressure difference between battery to be equalized is reduced within corresponding threshold pressure differential and is capable of achieving battery equilibrium；Meet when simultaneously
The pressure difference that at least one cell voltage is reached between its corresponding threshold voltage and battery to be equalized in battery pack reaches accordingly
During threshold pressure differential, then cell voltage must be decreased below between its corresponding threshold voltage and battery to be equalized simultaneously
Pressure difference is reduced within corresponding threshold pressure differential and is just capable of achieving balance.
Although the condition for opening control charge switch is different, the technical scheme of its solve problem is roughly the same with principle,
When some embodiments are expanded on further to battery pack charge control method of the present invention below, then with cell voltage and its accordingly
Threshold voltage is described；Charge switch is by taking NMOS as an example.
Implement three
As shown in Fig. 2 equalizing circuit includes logic circuit and comparator, the quantity of comparator is with sampled signal quantity one by one
It is correspondingly arranged.Comparator includes first input end, the second input and output end, and first input end receives sampled signal, second
Input receives the reference signal corresponding with sampled signal, the equal couples logic circuit of output end of multiple comparators, logic electricity
The output end on road couples the control end of charge switch.
Voltage on each voltage controlled voltage source is determined that the voltage on i.e. voltage controlled voltage source U11 is K* by corresponding battery
V1, wherein V1 are the voltage on battery 1, and the voltage on voltage controlled voltage source U1N is K*VN, and wherein VN is the voltage on battery N.Pressure
The output for controlling voltage source is connected to an input of corresponding comparator, another input connection reference signal of comparator
VREF1, the output of each comparator is connected to logic circuit U20, the grid voltage of logic circuit U20 control charge switch M1.
If charge switch M1 is PMOS, the output of logic circuit U20 is opposite with the present embodiment.Voltage controlled voltage source is connected to comparator
Negative input end, reference signal is connected to as a example by the positive input terminal of comparator, and when the output of all comparators is all height, then logic is electric
The output G4 of road U20 is high level (if charge switch M1 is PMOS, G4 is low), charge switch M1 conductings；When there is one
Comparator be output as it is low, then the output G4 of logic circuit U20 be low level (if charge switch M1 is PMOS, G4 is
It is high), logic circuit U20 control charge switch M1 maintains shut-off 1 second.After 1 second, the output G4 of logic circuit U20 is height, and charging is opened
Close M1 conductings.After conducting certain hour, when some comparator is output as low, then the output G4 of logic circuit U20 is for low, and
Maintain 1 second, so circulation.
Example IV
As shown in figure 3, equalizing circuit includes output regulation circuit, operational amplifier and diode, operational amplifier and two
The quantity of pole pipe is corresponded with sampled signal quantity and set.Operational amplifier include first input end, the second input and
Output end, first input end receives sampled signal, and the second input receives the reference signal corresponding with sampled signal, output end
Coupling and one end of operational amplifier respective diode, the other end coupling output regulation circuit of diode, output regulation circuit
Common port with diode couples the control end of charge switch.The pressure acting as on increase charge switch of output regulation circuit
Drop, can be pull-up circuit or pull-down circuit, mainly depending on the type of charge switch, in the present embodiment due to charge switch
M1 selects NMOS, so output regulation circuit is pull-up circuit.
Operational amplifier judges whether wherein at least one cell voltage reaches its corresponding threshold voltage or/and to be equalized
Battery between pressure difference whether reach corresponding threshold pressure differential, if judgement reach above-mentioned threshold voltage condition or/and pressure differential,
Then corresponding diode current flow, so as to change the voltage of the control end of charge switch, makes it be operated in linear model, is filled with reducing
Electric current.
Voltage on each voltage controlled voltage source is determined that the voltage on i.e. voltage controlled voltage source U11 is K* by corresponding battery
V1, wherein V1 are the voltage on battery 1, and the voltage on voltage controlled voltage source U1N is K*VN, and wherein VN is the voltage on battery N, pressure
The voltage for controlling voltage source is the cell voltage for sampling, and is also above-mentioned sampled signal.With the difference in embodiment three
It is that the output of voltage controlled voltage source is attached to operational amplifier, rather than comparator.The output of voltage controlled voltage source is connected to phase
One input of the operational amplifier answered, another input connection reference signal VREF1 of operational amplifier, multiple computings
The output of amplifier is connected to the control pole G4 of charge switch M1 by each diode, wherein the anode connection of all diodes
Together, the control pole G4 of charge switch M1 is connected to, the negative electrode of each diode is connected to the output of corresponding operational amplifier
End.Pull-up circuit is connected to the control pole G4 of charge switch M1.The negative terminal of operational amplifier is connected to voltage controlled voltage source, is referred to
It is signally attached to as a example by the anode of operational amplifier, when the output of all operational amplifiers is all height, then G4 is pulled up on circuit
Draw, charge switch M1 conductings；When the voltage of certain voltage controlled voltage source is more than reference signal VREF1, then corresponding operational amplifier
Output is reduced, and corresponding diode current flow, the control pole G4 of charge switch is pulled down so that the conduction impedance of charge switch M1 increases
Plus, then pressure drop increases on charge switch M1, when the small electric current to single-unit electric discharge of charging current, does not correspond to this economize on electricity cell voltage just not
May proceed to rise, and the battery of other sections is in the state for continuing to charge, therefore, battery equilibrium can be realized by the present embodiment.
If charge switch M1 is PMOS, output regulation circuit is changed into pull-down circuit, and voltage controlled voltage source is being connected to operational amplifier just
Input, reference voltage is connected to the negative input end of operational amplifier, and the anode of diode is connected to corresponding operational amplifier
Output end, negative electrode is connected to the control pole of charge switch M1.When the output of all operational amplifiers is all low, then G4 is pulled down electricity
Road is drop-down, charge switch M1 conductings；When the voltage of certain voltage controlled voltage source is more than reference signal VREF1, then corresponding computing is put
Big device output is raised, and corresponding diode current flow, the control pole G4 of charge switch is pulled up so that the conducting resistance of charge switch M1
Anti- increase, then on charge switch M1 pressure drop increase, when charging current it is small to single-unit electric discharge electric current when, correspond to this economize on electricity cell voltage
Would not continue to rise, and the battery of other sections is in the state for continuing to charge.
Embodiment five
As shown in figure 4, being improved on the basis of the embodiment three shown in Fig. 2.Sampling is only illustrated due to Fig. 2 single
The voltage of individual battery, and be compared with corresponding battery threshold value.The present embodiment shown in Fig. 4, then increased to be equalized
The sampling of the pressure difference of battery, the pressure difference of described battery to be balanced can be pressure difference, or battery between single battery
Pressure difference between group, such as, two batteries are compared produced pressure difference with the pressure difference of two other battery.Additionally, being directed to
The sampling of the pressure difference of battery to be balanced, is equally applicable in example IV, i.e., pressure difference sampling section goes for each implementation
In the middle of example.
For convenience, increased part is only specifically described.Meanwhile, the present embodiment sets and is respectively provided with logic circuit
1 and logic circuit 2, it is necessary to explanation, by the comparator output terminal of single battery sampling section and the pressure difference of battery to be balanced
The comparator output terminal of sampling section connects same equalizing circuit and can also solve the technical problem of the present invention.But by setting up two separately
The mode of individual logic circuit, can more preferably solve technical problem of the invention, can both realize using logic circuit
Function, it is also possible to be separately controlled, for example, the pressure differential of the threshold condition of determination single battery and battery to be balanced is excellent
First level.
Specifically, the voltage on voltage controlled voltage source U31~U3n determined by the pressure difference of corresponding battery to be balanced, that is, press
Voltage on control voltage source U31 is K* (V1-V2), and wherein V1 is the voltage on battery 1, and V2 is the voltage on battery 1, voltage-controlled electricity
Potential source U31 is used to characterize the pressure difference of V1-V2, is compared with corresponding reference signal VREF2 by comparator U41.Due to depositing
V1 higher than V2 situation, it is also possible to exist V2 higher than V1 situation, so, be also provided with for characterize voltage for V2-V1 it
The voltage controlled voltage source U32 of pressure difference, voltage thereon is K* (V2-V1), by comparator U42 and corresponding reference signal VREF2
It is compared.Voltage on voltage controlled voltage source U3n is K* (VN-V (N-1)), and wherein VN is the voltage on battery N, and V (N-1) is
Voltage on battery N-1.For the selection of battery to be balanced voltage, both can be using any two battery difference phase interaction difference ratio
Compared with, it is also possible to according to actual conditions and demand, it is compared only for percentage of batteries.Therefore, voltage controlled voltage source U3n and comparator
Quantity n in U4n different from the N signs in VN, to show differentiation.The output of voltage controlled voltage source is connected to corresponding comparator
One input, another input connection reference signal VREF2 of comparator, the output of each comparator is connected to logic electricity
The grid voltage of road U40, logic circuit U40 control charge switch M1.If charge switch M1 is PMOS, logic circuit U40's
Output is opposite with the present embodiment.
Meanwhile, the pressure difference between battery to be balanced can be optimized, that is, choose the electricity of voltage minimum in all batteries
Pond, other each batteries battery minimum with the voltage respectively is compared so as to produce corresponding pressure difference, it is possible to reduce sampling
With the number of times for comparing.In this case,
The present invention is compared to the beneficial effect of prior art：In battery pack charging process, by battery balanced electricity
Road controls charge switch M1 on, off, to reduce equivalent charging current, while making battery cell reach equilibrium；In battery
In group charging process, when battery needs balanced, charge switch M1 is controlled linear switch by battery equalizing circuit, to reduce charging
Electric current；By battery equalizing circuit control charge switch M1 not only charge when, as protection switch, prevent battery from overshooting,
Also there is battery balanced effect.
Particular embodiments described above, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, it will be appreciated that the foregoing is only specific embodiment of the invention, the protection being not intended to limit the present invention
Scope.Particularly point out, to those skilled in the art, it is all within the spirit and principles in the present invention, done any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. a kind of battery pack charge control method, it is characterised in that comprise the following steps：
In battery pack charging process, pressure difference in battery pack between each cell voltage or/and battery to be balanced respectively with accordingly
Threshold voltage be compared, when wherein at least one cell voltage reaches its corresponding threshold voltage or/and battery to be balanced
Between pressure difference reach corresponding threshold pressure differential, then open euqalizing current to reaching the battery discharge of respective threshold voltage or to reaching
High-voltage battery electric discharge in threshold pressure differential；
In euqalizing current discharge process, by controlling the alternate conduction of charge switch and ending to reduce the average electricity of charging
Stream；Or, increase the pressure drop on charge switch, it is operated in linear model, to reduce charging current；Until by cell voltage
The pressure difference decreased below between its corresponding threshold voltage or/and battery to be balanced is reduced within corresponding threshold pressure differential.
2. battery pack charge control method according to claim 1, it is characterised in that：After euqalizing current is produced, after
It is continuous to judge that the pressure difference whether wherein at least one cell voltage is reached between its corresponding threshold voltage or/and battery to be balanced is
It is no to reach corresponding threshold pressure differential；
When its maximum current is reached in euqalizing current, above-mentioned threshold voltage condition or/and pressure differential is still reached；
Then by controlling the alternate conduction of charge switch with cut-off to reduce the average current of charging or increase charge switch
Pressure drop, makes it be operated in linear model, to reduce charging current.
3. battery pack charge control method according to claim 1 and 2, it is characterised in that：In battery pack charging process, inspection
The state of charge of battery pack is surveyed, when battery pack is not full of, then using constant current charging mode；When battery pack is full of soon, then
Using constant-voltage charge pattern.
4. battery pack charge control method according to claim 2, it is characterised in that：In battery pack charging process, detection
The state of charge of battery pack, when battery pack is not full of, then using constant current charging mode；
When reaching its maximum current in euqalizing current, wherein at least one cell voltage still reach its corresponding threshold voltage or/
When pressure difference and battery to be balanced between still reaches corresponding threshold pressure differential, then the control terminal voltage of charge switch is adjusted, make its work
Make in saturation region；When battery voltage, charge switch and after the total voltage of pressure drop is increased to preset value on discharge switch, then exit
Constant current charging mode, into constant-voltage charge pattern so that cell voltage decreases below its corresponding threshold voltage or/and treats
Pressure difference between weighing apparatus battery is reduced within corresponding threshold pressure differential.
5. battery pack charge control method according to claim 4, it is characterised in that：Described battery pack full of and
The state that the battery pack is full of soon is by battery voltage, charge switch and whether the total voltage of pressure drop reaches on discharge switch
The preset value judges；When the total voltage is less than the preset value, then judge that battery pack is not full of；The total voltage reaches
During to the preset value, then judge that battery pack is full of soon.
6. a kind of charging assembly, it is characterised in that：Including,
Equalizing circuit, coupling battery pack, the pressure difference in sampling battery group between each cell voltage or/and battery to be balanced, and
It is compared with corresponding threshold value respectively；When wherein at least one cell voltage reaches its corresponding threshold voltage or/and treats
When pressure difference between weighing apparatus battery reaches corresponding threshold pressure differential, then euqalizing current is opened to reaching the battery discharge of respective threshold voltage
Or to reaching the electric discharge of the high-voltage battery in threshold pressure differential, the output end of the equalizing circuit couples the control of charge switch
End；
Charge switch, its control end couples the equalizing circuit, in euqalizing current discharge process, by controlling charge switch
Alternate conduction, with the pressure drop on the average current or increase charge switch that reduce charging, makes it be operated in linear mould with cut-off
Formula, to reduce charging current.
7. charging assembly according to claim 6, it is characterised in that：Described equalizing circuit includes logic circuit and compares
Obtained by pressure difference in device, the comparator and the sampling battery group between each cell voltage or/and battery to be equalized
Sampled signal correspond set, the comparator include first input end, the second input and output end, its first input
End receives the sampled signal, and the reception of its second input is corresponding with the sampled signal and for characterizing the threshold voltage
Or the reference signal of threshold pressure differential, the output end of multiple comparators couples the logic circuit, the output of the logic circuit
The control end of end coupling charge switch.
8. charging assembly according to claim 6, it is characterised in that：Described equalizing circuit includes pull-up circuit or drop-down
Circuit, operational amplifier and diode, the operational amplifier and diode are electric with each battery in the sampling battery group
The sampled signal obtained by pressure difference between pressure or/and battery to be equalized is corresponded and set, and the operational amplifier includes
First input end, the second input and output end, its first input end receive the sampled signal, its second input receive with
The sampled signal is corresponding and for characterizing the reference signal of the threshold voltage or threshold pressure differential, the operational amplifier
Output end couples one end of respective diode, and the other end of diode couples the pull-up circuit or pull-down circuit, it is described on
Puller circuit or pull-down circuit couple the control end of charge switch with the common port of diode.
9. the charging assembly according to claim 7 or 8, it is characterised in that：Pressure difference between the battery to be equalized is
The pressure difference that each battery battery minimum with voltage respectively is compared.
10. the charging assembly according to claim 7 or 8, it is characterised in that：Described sampled signal is by respective battery electricity
Pressure or pressure difference are controlled and for characterizing the voltage controlled voltage source of respective battery voltage or pressure difference.
11. charging assemblies according to claim 8, it is characterised in that：The operational amplifier judges wherein at least one
Whether the pressure difference whether cell voltage is reached between its corresponding threshold voltage or/and battery to be equalized reaches corresponding pressure difference threshold
Value, if judgement reaches above-mentioned threshold voltage condition or/and pressure differential, corresponding diode current flow, so as to change charging open
The voltage of the control end of pass, makes it be operated in linear model, to reduce charging current.
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