CN104600383A - Battery pack electric quantity equalization method and apparatus thereof - Google Patents
Battery pack electric quantity equalization method and apparatus thereof Download PDFInfo
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- CN104600383A CN104600383A CN201310529144.1A CN201310529144A CN104600383A CN 104600383 A CN104600383 A CN 104600383A CN 201310529144 A CN201310529144 A CN 201310529144A CN 104600383 A CN104600383 A CN 104600383A
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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 battery pack electric quantity equalization method and an apparatus thereof. The method includes the following steps: acquiring the electric quantity of each of single batteries in a battery pack and the standing time of the battery pack after the battery pack is electrified; judging whether the standing time of the battery pack is longer than a preset time threshold or not; generating an electric quantity difference of the electrification this time according to the electric quantity of each of the single batteries in the electrified battery pack if the standing time is longer than the threshold; further judging whether the electric quantity difference this time is larger than an electric quantity last time or not; generating an equalization threshold according to the electric quantity difference of the electrification this time if the electric quantity difference this time is larger than the electric quantity difference last time; and carrying out electric quantity equalization on each of the single batteries in the battery pack according to the equalization threshold. The method in the embodiment of the invention allows the equalization threshold to be corrected in real time in order to reduce the electric quantity equalization frequency of the battery pack, so the charge and discharge efficiency of the battery pack is improved, and the service life of the battery pack is prolonged.
Description
Technical field
The present invention relates to cell art, particularly relate to a kind of electric quantity balancing method and apparatus of battery pack.
Background technology
At present, the battery pack of electric automobile is in series by cell mostly, because cell can produce difference in the fabrication process and in the cycle charge discharge electric process of battery pack, result in each cell not quite identical in rated capacity, voltage, internal resistance etc.Therefore first this cell making rated capacity little can be full of when charging, if continue charging, it can be caused to overcharge; Otherwise first the little cell of rated capacity can discharge when discharging, continuing to use and it then can be caused to cross put.Thus have impact on the normal use of battery pack, also reduce the useful life of battery pack, even cause battery pack cisco unity malfunction., can be addressed this problem by electric quantity balancing technology, the object of electric quantity balancing is the SOC(StateOf Charge making each cell, state-of-charge for this reason) consistent.
At present, mainly from two aspect research electric quantity balancing technology: one is research electric quantity balancing control method, mainly sets up the Conformance Assessment system of each cell in battery pack, and determines effective electric quantity balancing strategy on this basis; Two is hardware implementation mode that research electric quantity balancing controls, the mainly design of equalizing circuit, and the topographical form of equalizing circuit mainly can be divided into two classes: energy-dissipating is balanced and energy non-dissipative type is balanced.Wherein, energy-dissipating equilibrium refers to that the energy consuming the too high battery of monomer battery voltage carrys out the capacity difference in balancing battery group between each monomer; Energy non-dissipative type equilibrium refers to that energy carries out between each cell transmitting or shifting in battery pack.At present, based on the electric quantity balancing method of SOC as the energy non-dissipative type equilibrium of decision condition, the general difference only considering the SOC mean value of the SOC of cell and the battery pack at its place, opens equalizing circuit when difference reaches counterbalanced gate limit value.At the use initial stage of battery pack, the consistency of usual cell is better, so almost there is no defect, but along with the continuous increase of battery pack service time, following problem will be there is: the SOC gap between cell strengthens, make the SOC mean value gap of the SOC of the poorest cell in battery pack and battery pack be easy to reach counterbalanced gate limit value, thus open equalizing circuit continually.Because equalizing circuit itself also can consumed energy, the energy in addition consumed in transmitting procedure, thus the efficiency greatly reducing the discharge and recharge of battery pack.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, first object of the present invention is a kind of electric quantity balancing method proposing battery pack.The method can correct counterbalanced gate limit value in real time, thus decreases the electric quantity balancing number of times of battery pack, improves the efficiency of the discharge and recharge of battery pack.
Second object of the present invention is the electric quantity balancing device proposing a kind of battery pack.
To achieve these goals, the electric quantity balancing method of the battery pack of first aspect present invention embodiment, comprises the following steps: on the battery pack after electricity, obtains the electricity of each cell in described battery pack and obtains the time of repose of described battery pack; Judge whether the time of repose of described battery pack is greater than preset time threshold; If judge to be greater than described preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of described battery pack; It is poor whether the electricity difference that described in further judgement, this powers on is greater than the previous electricity powered on; If it is poor to be greater than the described previous electricity powered on, then generate counterbalanced gate limit value according to the described electricity that this powers on difference; And according to described counterbalanced gate limit value, electric quantity balancing is carried out to cell each in described battery pack.
The electric quantity balancing method of the battery pack of the embodiment of the present invention, by correcting in real time counterbalanced gate limit value, thus decreasing the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extending the useful life of battery pack.
In one embodiment of the invention, the electric quantity balancing method of described battery pack also comprises: if judge to be not more than described preset time threshold, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
In one embodiment of the invention, the electric quantity balancing method of described battery pack also comprises: if it is poor to judge that the described electricity that this powers on difference is not more than the previous electricity powered on, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
The electric quantity balancing method of the battery pack of the embodiment of the present invention, when the time of repose of battery pack is not more than preset time threshold or when this electricity difference powered on is not more than the previous electricity difference powered on, the previous electricity difference powered on is selected to generate counterbalanced gate limit value, make the counterbalanced gate limit value of generation more accurate, further reduce the electric quantity balancing number of times of battery pack, further increase the efficiency of the discharge and recharge of battery pack.
In one embodiment of the invention, the electric quantity balancing method of described battery pack also comprises: under battery pack after electricity, obtains the electricity of each cell in described battery pack and obtains the overall electricity of described battery pack; Judge whether the overall electricity of described battery pack is less than default power threshold; If judgement is less than described default power threshold, then generate this lower electric electricity according to the electricity of each cell of described battery pack after this lower electricity poor; The electricity whether the electricity difference of this lower electricity described in further judgement is greater than previous lower electricity is poor; If the electricity being greater than described previous lower electricity is poor, then generate described counterbalanced gate limit value according to the electricity difference of this lower electricity described; And according to described counterbalanced gate limit value, electric quantity balancing is carried out to cell each in described battery pack.
In one embodiment of the invention, the electric quantity balancing method of described battery pack also comprises: if judge to be not less than described default power threshold, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
In one embodiment of the invention, the electric quantity balancing method of described battery pack also comprises: if judge that the electricity that this lower electric electricity difference described is not more than previous lower electricity is poor, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
Under battery pack after electricity, counterbalanced gate limit value is corrected in real time, further improve the accuracy of counterbalanced gate limit value, thus decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
To achieve these goals, the electric quantity balancing device of the battery pack of second aspect present invention embodiment, comprise: power on acquisition module, for after electricity on the battery pack, obtain the electricity of each cell in described battery pack and obtain the time of repose of described battery pack; Power on judge module, for judging whether the time of repose of described battery pack is greater than preset time threshold; Upper power consumption difference generates module, if be greater than described preset time threshold for judging, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of described battery pack; Upper power consumption difference judge module, poor for judging whether the described electricity that this powers on difference is greater than the previous electricity powered on further; The threshold value that powers on generation module, if poor for being greater than the described previous electricity powered on, then generates counterbalanced gate limit value according to the described electricity that this powers on difference; And the balance module that powers on, for carrying out electric quantity balancing according to described counterbalanced gate limit value to cell each in described battery pack.
The electric quantity balancing device of the battery pack of the embodiment of the present invention, by powering on, threshold value generation module corrects in real time to counterbalanced gate limit value, decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In one embodiment of the invention, the described upper power consumption difference in the electric quantity balancing device of described battery pack generate module also for: if judge to be not more than described preset time threshold, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
In one embodiment of the invention, power on described in the electric quantity balancing device of described battery pack threshold value generation module also for: if it is poor to judge that the described electricity that this powers on difference is not more than the previous electricity powered on, then according to the described previous described counterbalanced gate limit value of electricity difference generation powered on.
The electric quantity balancing device of the battery pack of the embodiment of the present invention, when the time of repose of battery pack is not more than preset time threshold or when this electricity difference powered on is not more than the previous electricity difference powered on, the previous electricity difference powered on is selected to generate counterbalanced gate limit value, make the counterbalanced gate limit value of generation more accurate, further reduce the electric quantity balancing number of times of battery pack, further increase the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In one embodiment of the invention, the electric quantity balancing device of described battery pack also comprises: lower electric acquisition module, after electricity under battery pack, obtains the electricity of each cell in described battery pack and obtains the overall electricity of described battery pack; Lower electric judge module, for judging whether the overall electricity of described battery pack is less than default power threshold; Lower power consumption difference generation module, if be less than described default power threshold for judgement, then generates this lower electric electricity according to the electricity of each cell of described battery pack after this lower electricity poor; Lower power consumption difference judge module, poor for judging the electricity whether this lower electric electricity difference described is greater than previous lower electricity further; Lower electric switch limit value generation module, if poor for the electricity being greater than described previous lower electricity, then generates described counterbalanced gate limit value according to the electricity difference of this lower electricity described; And lower electrical equalization module, for carrying out electric quantity balancing according to described counterbalanced gate limit value to cell each in described battery pack.
In one embodiment of the invention, the described lower power consumption difference generation module in the electric quantity balancing device of described battery pack also for: if judge to be not less than described default power threshold, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
In one embodiment of the invention, described lower electric switch limit value generation module in the electric quantity balancing device of described battery pack also for: if it is poor to judge that electricity difference of this lower electricity described is not more than the electricity of previous lower electricity, then according to the described counterbalanced gate limit value of electricity difference generation of described previous lower electricity.
Under battery pack after electricity, counterbalanced gate limit value is corrected in real time, further improve the accuracy of counterbalanced gate limit value, thus decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein,
Fig. 1 is the flow chart of the electric quantity balancing method of battery pack according to an embodiment of the invention;
Fig. 2 is the flow chart of the electric quantity balancing method of battery pack according to an embodiment of the invention;
Fig. 3 generates counterbalanced gate limit value under battery pack according to an embodiment of the invention to carry out the flow chart of the method for electric quantity balancing after electricity;
Fig. 4 is the structural representation of the electric quantity balancing device of battery pack according to an embodiment of the invention;
Fig. 5 is the structural representation of the electric quantity balancing device of battery pack according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.On the contrary, embodiments of the invention comprise fall into attached claims spirit and intension within the scope of all changes, amendment and equivalent.
In describing the invention, it is to be appreciated that term " first ", " second " etc. are only for describing object, and instruction or hint relative importance can not be interpreted as.In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.In addition, in describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In order to reduce the electric quantity balancing number of times of battery pack thus improve the efficiency of discharge and recharge of battery pack, the present invention proposes a kind of electric quantity balancing method and apparatus of battery pack.Below with reference to the accompanying drawings the electric quantity balancing method and apparatus of the battery pack of the embodiment of the present invention is described.
The electric quantity balancing method of battery pack that the present invention proposes, comprises the following steps: on the battery pack after electricity, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack; Judge whether the time of repose of battery pack is greater than preset time threshold; If judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack; It is poor whether the further electricity difference judging that this powers on is greater than the previous electricity powered on; If it is poor to be greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value; And according to counterbalanced gate limit value, electric quantity balancing is carried out to cell each in battery pack.The method by correcting in real time counterbalanced gate limit value, thus decreases the electric quantity balancing number of times of battery pack, improves the efficiency of the discharge and recharge of battery pack, extends the useful life of battery pack.
Fig. 1 is the flow chart of the electric quantity balancing method of battery pack according to an embodiment of the invention.
As shown in Figure 1, the electric quantity balancing method of the battery pack of the embodiment of the present invention comprises the steps.
Step S101, on the battery pack after electricity, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack.
Particularly, on the battery pack after electricity, obtain the electricity of each cell in battery pack.In one embodiment of the invention, the electricity of cell can describe with SOC, and the ratio of the dump energy that cell is current and specified electric quantity is the SOC of cell, for example, open circuit voltage method can be used to calculate the SOC of cell.
In addition, on the battery pack after electricity, the time of repose of battery pack is obtained.Particularly, the SOC due to cell calculates comparatively accurate when time of repose is greater than preset time threshold, therefore needs the time of repose obtaining battery pack for follow-up judgement.In an embodiment of the present invention, above-mentioned preset time threshold can set according to parameters such as the type of battery pack, service times, does not limit in embodiments of the present invention to preset time threshold.
Step S102, judges whether the time of repose of battery pack is greater than preset time threshold.
Particularly, after obtaining the time of repose of battery pack, judge whether the time of repose of battery pack is greater than preset time threshold, namely judge whether battery pack have passed through sufficiently long time of repose.In embodiments of the present invention, if time of repose long enough, so now in this battery pack, the SOC of each cell can be comparatively stable, also relatively accurately with true.
Step S103, if judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack.
Particularly, if the time of repose of battery pack is greater than preset time threshold, then illustrate that battery pack have passed through sufficiently long time of repose, the SOC so calculating cell will be comparatively accurate.
More specifically, if judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack, the electricity difference Δ SOC that this powers on
upper newrepresent, Δ SOC
upper newobtained by following formulae discovery:
Δ SOC
upper new=SOC
mean is upper new-SOC
min is upper new(1)
Wherein, SOC
mean is upper newfor the mean value of battery pack SOC when this powers on, SOC
min is upper newfor the minimum value of cell SOC in battery pack when this powers on.
Step S104, it is poor whether the further electricity difference judging that this powers on is greater than the previous electricity powered on.
Particularly, this electricity difference Δ SOC powered on is judged
upper newwhether be greater than the previous electricity difference Δ SOC powered on
upper old.Wherein, Δ SOC
upper oldobtained by following formulae discovery:
Δ SOC
upper old=SOC
mean is upper old-SOC
min is upper old(2)
Wherein, SOC
mean is upper oldfor the mean value of battery pack SOC during previous powering on, SOC
min is upper oldfor the minimum value of cell SOC in battery pack during previous powering on.
Step S105, if it is poor to be greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value.
Particularly, if this electricity difference Δ SOC powered on
upper newbe greater than the previous electricity difference Δ SOC powered on
upper old, then according to the electricity difference Δ SOC that this powers on
upper newgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Δ SOC
upper new(3)
K
1=Q
1×SOH （4）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient.K
1, Q
1can be obtained by test.
Step S106, carries out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Particularly, according to the counterbalanced gate limit value generated, electric quantity balancing is carried out to cell each in battery pack.Such as, in the use procedure of battery pack, (the SOC that real-time judge is current
mean-SOC
min) and Δ SOC
limitmagnitude relationship.As (SOC
mean-SOC
min) > Δ SOC
limittime, open equalizing circuit, electric quantity balancing is carried out to cell each in battery pack, by the energy trasfer in cell maximum for SOC in battery pack in the minimum cell of SOC; As (SOC
mean-SOC
min) < Δ SOC
limittime, close equalizing circuit.Wherein, SOC
meanfor the mean value of present battery group SOC, SOC
minfor the minimum value of cell SOC in present battery group.
The electric quantity balancing method of the battery pack of the embodiment of the present invention, by correcting in real time counterbalanced gate limit value, thus decreasing the electric quantity balancing number of times of battery pack, improve the efficiency of battery set charge/discharge, extending the useful life of battery pack.
Fig. 2 is the flow chart of the electric quantity balancing method of battery pack according to an embodiment of the invention.
As shown in Figure 2, the electric quantity balancing method of the battery pack of the embodiment of the present invention comprises the steps.
Step S201, on the battery pack after electricity, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack.
Particularly, on the battery pack after electricity, obtain the electricity of each cell in battery pack.In one embodiment of the invention, the electricity of cell can describe with state-of-charge SOC, the ratio of the dump energy that cell is current and specified electric quantity is the SOC of cell, for example, open circuit voltage method can be used to calculate the SOC of cell.
In addition, on the battery pack after electricity, the time of repose of battery pack is obtained.Particularly, the SOC due to cell calculates comparatively accurate when time of repose is greater than preset time threshold, therefore needs the time of repose obtaining battery pack for follow-up judgement.In an embodiment of the present invention, above-mentioned preset time threshold can set according to parameters such as the type of battery pack, service times, does not limit in embodiments of the present invention to preset time threshold.
Step S202, judges whether the time of repose of battery pack is greater than preset time threshold.
Particularly, after obtaining the time of repose of battery pack, judge whether the time of repose of battery pack is greater than preset time threshold, namely judge whether battery pack have passed through sufficiently long time of repose.In embodiments of the present invention, if time of repose long enough, so now in this battery pack, the SOC of each cell can be comparatively stable, also relatively accurately with true.
Step S203, if judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack.
Particularly, if the time of repose of battery pack is greater than preset time threshold, then illustrate that battery pack have passed through sufficiently long time of repose, the SOC so calculating cell will be comparatively accurate.
More specifically, if judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack, the electricity difference Δ SOC that this powers on
upper newrepresent, Δ SOC
upper newobtained by following formulae discovery:
Δ SOC
upper new=SOC
mean is upper new-SOC
min is upper new(5)
Wherein, SOC
mean is upper newfor the mean value of battery pack SOC when this powers on, SOC
min is upper newfor the minimum value of cell SOC in battery pack when this powers on.
In addition, continue to perform step S205 after step S203.
Step S204, if judge to be not more than preset time threshold, then generates counterbalanced gate limit value according to the previous electricity difference powered on.
Particularly, if the time of repose of battery pack is not more than preset time threshold, then illustrate that battery pack is not through sufficiently long time of repose, so use the previous electricity difference Δ SOC powered on
upper oldthe counterbalanced gate limit value generated is comparatively accurate.Wherein, the previous electricity difference Δ SOC powered on
upper oldobtained by following formulae discovery:
Δ SOC
upper old=SOC
mean is upper old-SOC
min is upper old(6)
Wherein, SOC
mean is oldfor the mean value of battery pack SOC during previous powering on, SOC
min is oldfor the minimum value of cell SOC in battery pack during previous powering on.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Δ SOC
upper old(7)
K
1=Q
1×SOH （8）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper oldfor the previous electricity powered on is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient.K
1, Q
1can be obtained by test.
In addition, continue after step s 204 to perform step S208.
Step S205, it is poor whether the further electricity difference judging that this powers on is greater than the previous electricity powered on.
Particularly, this electricity difference Δ SOC powered on is judged
upper newwhether be greater than the previous electricity difference Δ SOC powered on
upper old.Wherein, Δ SOC
upper newcalculated by formula (5), Δ SOC
upper oldcalculated by formula (6).
Step S206, if it is poor to be greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value.
Particularly, if this electricity difference Δ SOC powered on
upper newbe greater than the previous electricity difference Δ SOC powered on
upper old, then according to the electricity difference Δ SOC that this powers on
upper newgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Δ SOC
upper new(9)
K
1=Q
1×SOH （10）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient.K
1, Q
1can be obtained by test.
In addition, continue to perform step S208 after step S206.
Step S207, if it is poor to judge that electricity difference that this powers on is not more than the previous electricity powered on, then according to the previous electricity difference generation counterbalanced gate limit value powered on.
Particularly, if this electricity difference Δ SOC powered on
upper newbe not more than the previous electricity difference Δ SOC powered on
upper old, then according to the previous electricity difference Δ SOC powered on
upper oldgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is calculated by above-mentioned formula (7) and (8).
Step S208, carries out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Particularly, according to the counterbalanced gate limit value generated, electric quantity balancing is carried out to cell each in battery pack.Such as, in the use procedure of battery pack, (the SOC that real-time judge is current
mean-SOC
min) and Δ SOC
limitmagnitude relationship.As (SOC
mean-SOC
min) > Δ SOC
limittime, open equalizing circuit, electric quantity balancing is carried out to cell each in battery pack, by the energy trasfer in cell maximum for SOC in battery pack in the minimum cell of SOC; As (SOC
mean-SOC
min) < Δ SOC
limittime, close equalizing circuit.Wherein, SOC
meanfor the mean value of present battery group SOC, SOC
minfor the minimum value of cell SOC in present battery group.
The electric quantity balancing method of the battery pack of the embodiment of the present invention, when the time of repose of battery pack is not more than preset time threshold or when this electricity difference powered on is not more than the previous electricity difference powered on, the previous electricity difference powered on is selected to generate counterbalanced gate limit value, make the counterbalanced gate limit value of generation more accurate, further reduce the electric quantity balancing number of times of battery pack, further increase the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
After each battery pack powers on, to Δ SOC
on(electricity powered on is poor) carries out real time correction, so under each battery pack after electricity, and also will to Δ SOC
under(electricity of lower electricity is poor) carries out real time correction.Described content describes after battery pack powers on above, by Δ SOC
oncarry out real time correction to generate the detailed process of counterbalanced gate limit value, will to specifically describe below under battery pack after electricity Δ SOC
undercarry out real time correction process and according to Δ SOC
undergenerate the process of counterbalanced gate limit value.
Fig. 3 generates counterbalanced gate limit value under battery pack according to an embodiment of the invention to carry out the flow chart of the method for electric quantity balancing after electricity.
As shown in Figure 3, generate counterbalanced gate limit value under battery pack after electricity to comprise the steps with the method for carrying out electric quantity balancing.
Step S301, under battery pack after electricity, obtains the electricity of each cell in battery pack and obtains the overall electricity of battery pack.
Particularly, under battery pack after electricity, obtain the electricity of each cell and the overall electricity of battery pack in battery pack, the overall electricity of battery pack is the summation of the electricity of each cell in battery pack.Wherein, the electricity of cell can describe with state-of-charge SOC, and the ratio of the dump energy that cell is current and specified electric quantity is the SOC of cell.For example, open circuit voltage method can be used to calculate the SOC of cell.
Step S302, judges whether the overall electricity of battery pack is less than default power threshold.
Particularly, due to the inconsistency between cell show when battery pack deep discharge comparatively obvious, so need the overall electricity of battery pack and default power threshold to make comparisons, namely judge whether battery pack is deep discharge.Wherein, default power threshold can set according to parameters such as the type of battery pack, service times, does not limit in embodiments of the present invention to default power threshold.
Step S303, if judgement is less than default power threshold, then generates this lower electric electricity according to the electricity of each cell of battery pack after this lower electricity poor.
Particularly, if the overall electricity of battery pack is less than default power threshold, then illustrate that battery pack is deep discharge, it is comparatively obvious that inconsistency now between cell shows, thus comparatively accurate according to electricity difference of this lower electricity of the electricity generation of each cell of battery pack after this lower electricity.The electricity difference of this lower electricity uses Δ SOC
lower newrepresent, Δ SOC
lower newobtained by following formulae discovery:
Δ SOC
lower new=SOC
new under mean-SOC
new under min(11)
Wherein, SOC
new under meanfor the mean value of battery pack SOC during this lower electricity, SOC
new under minfor the minimum value of cell SOC in battery pack during this lower electricity.
In addition, continue to perform step S305 after step S303.
Step S304, if judge to be not less than default power threshold, then generates counterbalanced gate limit value according to the electricity difference of previous lower electricity.
Particularly, if the overall electricity of battery pack is not less than default power threshold, then illustrate that battery pack does not have deep discharge, so according to the electricity difference Δ SOC of previous lower electricity
lower oldthe counterbalanced gate limit value generated is comparatively accurate.Wherein, the electricity difference Δ SOC of previous lower electricity
lower oldobtained by following formulae discovery:
Δ SOC
lower old=SOC
old under mean-SOC
old under min(12)
Wherein, SOC
old under meanfor the mean value of battery pack SOC during previous lower electricity, SOC
old under minfor the minimum value of cell SOC in battery pack during previous lower electricity.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Max(Δ SOC
upper new, Δ SOC
upper old)+K
2× Δ SOC
lower old(13)
K
1=Q
1×SOH （14）
K
2=Q
2×SOH （15）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower oldfor the electricity of previous lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.K
1, K
2, Q
1, Q
2can be obtained by test.
In addition, continue to perform step S308 after step S304.
Step S305, judges that the electricity whether this lower electric electricity difference is greater than previous lower electricity is poor further.
Particularly, the electricity difference Δ SOC of this lower electricity is judged
lower newwhether be greater than the electricity difference Δ SOC of previous lower electricity
lower old.Wherein, Δ SOC
lower newcalculated by formula (11), Δ SOC
lower oldcalculated by formula (12).
Step S306, if the electricity being greater than previous lower electricity is poor, then generates counterbalanced gate limit value according to the electricity difference of this lower electricity.
Particularly, if the electricity difference Δ SOC of this lower electricity
lower newbe greater than the electricity difference Δ SOC of previous lower electricity
lower old, then according to the electricity difference Δ SOC of this lower electricity
lower newgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Max(Δ SOC
upper new, Δ SOC
upper old)+K
2× Δ SOC
lower new(16)
K
1=Q
1×SOH （17）
K
2=Q
2×SOH （18）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower newfor electricity during this lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.K
1, K
2, Q
1, Q
2can be obtained by test.
In addition, continue to perform step S308 after step S306.
Step S307, if judge that the electricity that this lower electric electricity difference is not more than previous lower electricity is poor, then generates counterbalanced gate limit value according to the electricity difference of previous lower electricity.
Particularly, if the electricity difference Δ SOC of this lower electricity
lower newbe not more than the electricity difference Δ SOC of previous lower electricity
lower old, then according to the electricity difference Δ SOC of previous lower electricity
lower oldgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is calculated by above-mentioned formula (13) ~ (15).
Step S308, carries out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Particularly, according to the counterbalanced gate limit value generated, electric quantity balancing is carried out to cell each in battery pack.Such as, in the use procedure of battery pack, (the SOC that real-time judge is current
mean-SOC
min) and Δ SOC
limitmagnitude relationship.As (SOC
mean-SOC
min) > Δ SOC
limittime, open equalizing circuit, electric quantity balancing is carried out to cell each in battery pack, by the energy trasfer in cell maximum for SOC in battery pack in the minimum cell of SOC; As (SOC
mean-SOC
min) < Δ SOC
limittime, close equalizing circuit.Wherein, SOC
meanfor the mean value of present battery group SOC, SOC
minfor the minimum value of cell SOC in present battery group.
Under battery pack after electricity, counterbalanced gate limit value is also corrected in real time, further improve the accuracy of counterbalanced gate limit value, thus decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In one embodiment of the invention, embodiment shown in embodiment shown in Fig. 2 and Fig. 3 is combined, all counterbalanced gate limit value is corrected in real time after electricity after each battery pack powers on and under each battery pack, make counterbalanced gate limit value more accurate, thus decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In order to realize above-described embodiment, the present invention also proposes a kind of electric quantity balancing device of battery pack.
An electric quantity balancing device for battery pack, comprising: power on acquisition module, for after electricity on the battery pack, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack; Power on judge module, for judging whether the time of repose of battery pack is greater than preset time threshold; Upper power consumption difference generates module, if be greater than preset time threshold for judging, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack; Upper power consumption difference judge module, poor for judging whether electricity difference that this powers on is greater than the previous electricity powered on further; The threshold value that powers on generation module, if poor for being greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value; And the balance module that powers on, for carrying out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.This device by correcting in real time counterbalanced gate limit value, thus decreases the electric quantity balancing number of times of battery pack, improves the efficiency of the discharge and recharge of battery pack, extends the useful life of battery pack.
Fig. 4 is the structural representation of the electric quantity balancing device of battery pack according to an embodiment of the invention.
As shown in Figure 4, the electric quantity balancing device of battery pack comprises: the acquisition module 100 that powers on, the judge module 200 that powers on, upper power consumption difference generates module 300, upper power consumption difference judge module 400, the threshold value that powers on generation module 500, power on balance module 600.
Wherein, the acquisition module 100 that powers on, for after electricity on the battery pack, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack.
Particularly, particularly, on the battery pack after electricity, the acquisition module 100 that powers on obtains the electricity of each cell in battery pack.In one embodiment of the invention, the electricity of cell can describe with SOC, and the ratio of the dump energy that cell is current and specified electric quantity is the SOC of cell.For example, open circuit voltage method can be used to calculate the SOC of cell.
In addition, on the battery pack after electricity, the acquisition module 100 that powers on obtains the time of repose of battery pack.Particularly, the SOC due to cell calculates comparatively accurate when time of repose is greater than preset time threshold, therefore needs the time of repose obtaining battery pack for follow-up judgement.In an embodiment of the present invention, above-mentioned preset time threshold can set according to parameters such as the type of battery pack, service times, does not limit in embodiments of the present invention to preset time threshold.
Power on judge module 200 for judging whether the time of repose of battery pack is greater than preset time threshold.
Particularly, after the acquisition module 100 that powers on obtains the time of repose of battery pack, the judge module 200 that powers on, for judging whether the time of repose of battery pack is greater than preset time threshold, namely judges whether battery pack have passed through sufficiently long time of repose.In embodiments of the present invention, if time of repose long enough, so now in this battery pack, the SOC of each cell can be comparatively stable, also relatively accurately with true.
If upper power consumption difference generates module 300 be greater than preset time threshold for judging, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack.
Particularly, if the time of repose of battery pack is greater than preset time threshold, then illustrate that battery pack have passed through sufficiently long time of repose, the SOC so calculating cell will be comparatively accurate.
More specifically, if judge to be greater than preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack, the electricity difference Δ SOC that this powers on
upper newrepresent, Δ SOC
upper newobtained by following formulae discovery:
Δ SOC
upper new=SOC
mean is upper new-SOC
min is upper new(19)
Wherein, SOC
mean is upper newfor the mean value of battery pack SOC when this powers on, SOC
min is upper newfor the minimum value of cell SOC in battery pack when this powers on.
It is poor whether upper power consumption difference judge module 400 is greater than the previous electricity powered on for the electricity difference judging this further and power on.
Particularly, this electricity difference Δ SOC powered on is judged
upper newwhether be greater than the previous electricity difference Δ SOC powered on
upper old.Wherein, Δ SOC
upper oldobtained by following formulae discovery:
Δ SOC
upper old=SOC
mean is upper old-SOC
min is upper old(20)
Wherein, SOC
mean is upper oldfor the mean value of battery pack SOC during previous powering on, SOC
min is upper oldfor the minimum value of cell SOC in battery pack during previous powering on.
If powered on, threshold value generation module 500 is poor for being greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value.
Particularly, if this electricity difference Δ SOC powered on
upper newbe greater than the previous electricity difference Δ SOC powered on
upper old, then according to the electricity difference Δ SOC that this powers on
upper newgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Δ SOC
upper new(21)
K
1=Q
1×SOH （22）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
underconcrete calculating and choosing method introduce in the embodiment below.K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.K
1, Q
1can be obtained by test.
Power on balance module 600 for carrying out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Particularly, the balance module 600 that powers on carries out electric quantity balancing according to the counterbalanced gate limit value generated to cell each in battery pack.Such as, in the use procedure of battery pack, (the SOC that balance module 600 real-time judge that powers on is current
mean-SOC
min) and Δ SOC
limitmagnitude relationship.As (SOC
mean-SOC
min) > Δ SOC
limittime, open equalizing circuit, electric quantity balancing is carried out to cell each in battery pack, by the energy trasfer in cell maximum for SOC in battery pack in the minimum cell of SOC; As (SOC
mean-SOC
min) < Δ SOC
limittime, close equalizing circuit.Wherein, SOC
meanfor the mean value of present battery group SOC, SOC
minfor the minimum value of cell SOC in present battery group.
The electric quantity balancing device of the battery pack of the embodiment of the present invention, the counterbalanced gate limit value generated in real time by the threshold value generation module that powers on carries out electric quantity balancing to cell each in battery pack, decrease the electric quantity balancing number of times of battery pack, improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In one embodiment of the invention, when the judge module 200 that powers on judges whether the time of repose of battery pack is greater than preset time threshold, the time of repose that also there is battery pack is not more than the situation of preset time threshold, so, if upper power consumption difference generates module 300 be also not more than preset time threshold for judging, then generate counterbalanced gate limit value according to the previous electricity difference powered on.
Particularly, if the time of repose of battery pack is not more than preset time threshold, then illustrate that battery pack is not through sufficiently long time of repose, so use the previous electricity difference Δ SOC powered on
upper oldthe counterbalanced gate limit value generated is comparatively accurate.Wherein, the previous electricity difference Δ SOC powered on
upper oldobtained by following formulae discovery:
Δ SOC
upper old=SOC
mean is upper old-SOC
min is upper old(23)
Wherein, SOC
mean is oldfor the mean value of battery pack SOC during previous powering on, SOC
min is oldfor the minimum value of cell SOC in battery pack during previous powering on.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Δ SOC
upper old(24)
K
1=Q
1×SOH （25）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper oldfor the previous electricity powered on is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient.K
1, Q
1can be obtained by test.
When upper power consumption difference judge module 400 judges whether the electricity difference that this powers on is greater than the previous electricity difference powered on further, also there is the situation that this electricity difference powered on is not more than the previous electricity difference powered on, so, if powered on, threshold value generation module 500 is also poor for judging that electricity difference that this powers on is not more than the previous electricity powered on, then according to the previous electricity difference generation counterbalanced gate limit value powered on.
Particularly, if this electricity difference Δ SOC powered on
upper newbe not more than the previous electricity difference Δ SOC powered on
upper old, then according to the previous electricity difference Δ SOC powered on
upper oldgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is calculated by above-mentioned formula (24) and (25).
The electric quantity balancing device of the battery pack of the embodiment of the present invention, when the time of repose of battery pack is not more than preset time threshold or when this electricity difference powered on is not more than the previous electricity difference powered on, the previous electricity difference powered on is selected to generate counterbalanced gate limit value, make the counterbalanced gate limit value of generation more accurate, further decrease the electric quantity balancing number of times of battery pack, further improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
Fig. 5 is the structural representation of the electric quantity balancing device of battery pack according to an embodiment of the invention.
As shown in Figure 5, the electric quantity balancing device of battery pack comprises: the acquisition module 100 that powers on, the judge module 200 that powers on, upper power consumption difference generates module 300, upper power consumption difference judge module 400, the threshold value that powers on generation module 500, the balance module 600 that powers on, lower electric acquisition module 700, lower electric judge module 800, lower power consumption difference generation module 900, lower power consumption difference judge module 1000, lower electric switch limit value generation module 1100 and lower electrical equalization module 1200.
Wherein, the acquisition module 100 that powers on, for after electricity on the battery pack, obtains the electricity of each cell in battery pack and obtains the time of repose of battery pack.
Power on judge module 200 for judging whether the time of repose of battery pack is greater than preset time threshold.
If upper power consumption difference generates module 300 be greater than preset time threshold for judging, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of battery pack.
If judge to be not more than preset time threshold, upper power consumption difference generates module 300 also for generating counterbalanced gate limit value according to the previous electricity difference powered on.
It is poor whether upper power consumption difference judge module 400 is greater than the previous electricity powered on for the electricity difference judging this further and power on.
If powered on, threshold value generation module 500 is poor for being greater than the previous electricity powered on, then the electricity difference powered on according to this generates counterbalanced gate limit value.
If it is poor to judge that electricity difference that this powers on is not more than the previous electricity powered on, the threshold value that powers on generation module 500 is also for according to the previous electricity difference generation counterbalanced gate limit value powered on.
Power on balance module 600 for carrying out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Lower electric acquisition module 700, for after electricity under battery pack, obtains the electricity of each cell in battery pack and obtains the overall electricity of battery pack.
Particularly, under battery pack after electricity, lower electric acquisition module 700 obtains the electricity of each cell in battery pack and the overall electricity of battery pack, and the overall electricity of battery pack is the summation of the electricity of each cell in battery pack.Wherein, the electricity of cell can describe with state-of-charge SOC, and the ratio of the dump energy that cell is current and specified electric quantity is the SOC of cell.
Lower electric judge module 800 is for judging whether the overall electricity of battery pack is less than default power threshold.
Particularly, due to the inconsistency between cell show when battery pack deep discharge comparatively obvious, so need the overall electricity of battery pack and default power threshold to make comparisons, namely judge whether battery pack is deep discharge.Wherein, default power threshold can set according to parameters such as the type of battery pack, service times, does not limit in embodiments of the present invention to default power threshold.
If lower power consumption difference generation module 900 is less than default power threshold for judgement, then generate this lower electric electricity according to the electricity of each cell of battery pack after this lower electricity poor.
Particularly, if the overall electricity of battery pack is less than default power threshold, then illustrate that battery pack is deep discharge, it is comparatively obvious that inconsistency now between cell shows, thus comparatively accurate according to electricity difference of this lower electricity of the electricity generation of each cell of battery pack after this lower electricity.The electricity difference of this lower electricity uses Δ SOC
lower newrepresent, Δ SOC
lower newobtained by following formulae discovery:
Δ SOC
lower new=SOC
new under mean-SOC
new under min(26)
Wherein, SOC
new under meanfor the mean value of battery pack SOC during this lower electricity, SOC
new under minfor the minimum value of cell SOC in battery pack during this lower electricity.
Lower power consumption difference judge module 1000 is poor for judging whether electricity difference of this lower electricity is greater than the electricity of previous lower electricity further.
Particularly, the electricity difference Δ SOC of this lower electricity is judged
lower newwhether be greater than the electricity difference Δ SOC of previous lower electricity
lower old.Wherein, Δ SOC
lower newcalculated by formula (26), Δ SOC
lower oldobtained by following formulae discovery:
Δ SOC
lower old=SOC
old under mean-SOC
old under min(27)
Wherein, SOC
old under meanfor the mean value of battery pack SOC during previous lower electricity, SOC
old under minfor the minimum value of cell SOC in battery pack during previous lower electricity.
If lower electric switch limit value generation module 1100 is poor for the electricity being greater than previous lower electricity, then generate counterbalanced gate limit value according to the electricity difference of this lower electricity.
Particularly, if the electricity difference Δ SOC of this lower electricity
lower newbe greater than the electricity difference Δ SOC of previous lower electricity
lower old, then according to the electricity difference Δ SOC of this lower electricity
lower newgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Max(Δ SOC
upper new, Δ SOC
upper old)+K
2× Δ SOC
lower new(28)
K
1=Q
1×SOH （29）
K
2=Q
2×SOH （30）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower newfor electricity during this lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.K
1, K
2, Q
1, Q
2can be obtained by test.
Lower electrical equalization module 1200 is for carrying out electric quantity balancing according to counterbalanced gate limit value to cell each in battery pack.
Particularly, according to the counterbalanced gate limit value generated, electric quantity balancing is carried out to cell each in battery pack.Such as, in the use procedure of battery pack, (the SOC that real-time judge is current
mean-SOC
min) and Δ SOC
limitmagnitude relationship.As (SOC
mean-SOC
min) > Δ SOC
limittime, open equalizing circuit, electric quantity balancing is carried out to cell each in battery pack, by the energy trasfer in cell maximum for SOC in battery pack in the minimum cell of SOC; As (SOC
mean-SOC
min) < Δ SOC
limittime, close equalizing circuit.Wherein, SOC
meanfor the mean value of present battery group SOC, SOC
minfor the minimum value of cell SOC in present battery group.
The electric quantity balancing device of the battery pack of the embodiment of the present invention, by the threshold value generation module that powers on, lower electric switch limit value generation module, counterbalanced gate limit value is corrected in real time, and electric quantity balancing is carried out to cell each in battery pack, further reduce the electric quantity balancing number of times of battery pack, further increase the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
In one embodiment of the invention, when lower electric judge module 800 judges whether the overall electricity of battery pack is less than default power threshold, the overall electricity that also there is battery pack is not less than the situation of default power threshold, so, if lower power consumption difference generation module 900 is also not less than default power threshold for judging, then generate counterbalanced gate limit value according to the electricity difference of previous lower electricity.
Particularly, if the overall electricity of battery pack is not less than default power threshold, then illustrate that battery pack does not have deep discharge, so according to the electricity difference Δ SOC of previous lower electricity
lower oldthe counterbalanced gate limit value generated is comparatively accurate.Wherein, the electricity difference Δ SOC of previous lower electricity
lower oldcalculated by formula (27).
More specifically, counterbalanced gate limit value is obtained by following formulae discovery:
Δ SOC
limit=Δ SOC
begin+ K
1× Max(Δ SOC
upper new, Δ SOC
upper old)+K
2× Δ SOC
lower old(31)
K
1=Q
1×SOH （32）
K
2=Q
2×SOH （33）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower oldfor electricity during previous lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.K
1, K
2, Q
1, Q
2can be obtained by test.
When lower power consumption difference judge module 1000 is for judging whether the electricity difference of this lower electricity is greater than the electricity difference of previous lower electricity further, the electricity difference that also there is this lower electricity is not more than the situation of the electricity difference of previous lower electricity, so, if lower electric switch limit value generation module 1100 is also poor for judging the electricity that this lower electric electricity difference is not more than previous lower electricity, then generate counterbalanced gate limit value according to the electricity difference of previous lower electricity.
Particularly, if the electricity difference Δ SOC of this lower electricity
lower newbe not more than the electricity difference Δ SOC of previous lower electricity
lower old, then according to the electricity difference Δ SOC of previous lower electricity
lower oldgenerate counterbalanced gate limit value.
More specifically, counterbalanced gate limit value is calculated by above-mentioned formula (31) ~ (33).
The electric quantity balancing device of the battery pack of the embodiment of the present invention, when the overall electricity of battery pack is not less than default power threshold or when electricity difference of this lower electricity is not more than the electricity difference of previous lower electricity, the previous electricity difference powered on is selected to generate counterbalanced gate limit value, make the counterbalanced gate limit value of generation more accurate, further decrease the electric quantity balancing number of times of battery pack, further improve the efficiency of the discharge and recharge of battery pack, extend the useful life of battery pack.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (14)
1. an electric quantity balancing method for battery pack, is characterized in that, comprise the following steps:
On the battery pack after electricity, obtain the electricity of each cell in described battery pack and obtain the time of repose of described battery pack;
Judge whether the time of repose of described battery pack is greater than preset time threshold;
If judge to be greater than described preset time threshold, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of described battery pack;
It is poor whether the electricity difference that described in further judgement, this powers on is greater than the previous electricity powered on;
If it is poor to be greater than the described previous electricity powered on, then generate counterbalanced gate limit value according to the described electricity that this powers on difference; And
According to described counterbalanced gate limit value, electric quantity balancing is carried out to cell each in described battery pack.
2. the method for claim 1, is characterized in that, also comprises:
If judge to be not more than described preset time threshold, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
3. the method for claim 1, is characterized in that, also comprises:
If it is poor to judge that the described electricity that this powers on difference is not more than the previous electricity powered on, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
4. the method for claim 1, is characterized in that, also comprises:
Under battery pack after electricity, obtain the electricity of each cell in described battery pack and obtain the overall electricity of described battery pack;
Judge whether the overall electricity of described battery pack is less than default power threshold;
If judgement is less than described default power threshold, then generate this lower electric electricity according to the electricity of each cell of described battery pack after this lower electricity poor;
The electricity whether the electricity difference of this lower electricity described in further judgement is greater than previous lower electricity is poor;
If the electricity being greater than described previous lower electricity is poor, then generate described counterbalanced gate limit value according to the electricity difference of this lower electricity described; And
According to described counterbalanced gate limit value, electric quantity balancing is carried out to cell each in described battery pack.
5. method as claimed in claim 4, is characterized in that, also comprise:
If judge to be not less than described default power threshold, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
6. method as claimed in claim 4, is characterized in that, also comprise:
If judge that the electricity that this lower electric electricity difference described is not more than previous lower electricity is poor, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
7. the method as described in any one of claim 1-6, is characterized in that, generates described counterbalanced gate limit value by following formula:
K
1=Q
1×SOH （2）
K
2=Q
2×SOH （3）
Wherein, SOC(State Of Charge) be the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower newfor the electricity of this lower electricity is poor, Δ SOC
lower oldfor the electricity of previous lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.
8. an electric quantity balancing device for battery pack, is characterized in that, comprising:
Power on acquisition module, for after electricity on the battery pack, obtains the electricity of each cell in described battery pack and obtain the time of repose of described battery pack;
Power on judge module, for judging whether the time of repose of described battery pack is greater than preset time threshold;
Upper power consumption difference generates module, if be greater than described preset time threshold for judging, then after powering on according to this, to generate this electricity powered on poor for the electricity of each cell of described battery pack;
Upper power consumption difference judge module, poor for judging whether the described electricity that this powers on difference is greater than the previous electricity powered on further;
The threshold value that powers on generation module, if poor for being greater than the described previous electricity powered on, then generates counterbalanced gate limit value according to the described electricity that this powers on difference; And
Power on balance module, for carrying out electric quantity balancing according to described counterbalanced gate limit value to cell each in described battery pack.
9. device as claimed in claim 8, is characterized in that, described upper power consumption difference generate module also for: if judge to be not more than described preset time threshold, then generate described counterbalanced gate limit value according to the described previous electricity difference powered on.
10. device as claimed in claim 8, it is characterized in that, described power on threshold value generation module also for: if it is poor to judge that the described electricity that this powers on difference is not more than the previous electricity powered on, then according to the described previous described counterbalanced gate limit value of electricity difference generation powered on.
11. devices as claimed in claim 8, is characterized in that, also comprise:
Lower electric acquisition module, after electricity under battery pack, obtains the electricity of each cell in described battery pack and obtains the overall electricity of described battery pack;
Lower electric judge module, for judging whether the overall electricity of described battery pack is less than default power threshold;
Lower power consumption difference generation module, if be less than described default power threshold for judgement, then generates this lower electric electricity according to the electricity of each cell of described battery pack after this lower electricity poor;
Lower power consumption difference judge module, poor for judging the electricity whether this lower electric electricity difference described is greater than previous lower electricity further;
Lower electric switch limit value generation module, if poor for the electricity being greater than described previous lower electricity, then generates described counterbalanced gate limit value according to the electricity difference of this lower electricity described; And
Lower electrical equalization module, for carrying out electric quantity balancing according to described counterbalanced gate limit value to cell each in described battery pack.
12. devices as claimed in claim 11, is characterized in that, described lower power consumption difference generation module also for: if judge to be not less than described default power threshold, then generate described counterbalanced gate limit value according to the electricity difference of described previous lower electricity.
13. devices as claimed in claim 11, it is characterized in that, described lower electric switch limit value generation module also for: if it is poor to judge that electricity difference of this lower electricity described is not more than the electricity of previous lower electricity, then according to the described counterbalanced gate limit value of electricity difference generation of described previous lower electricity.
14. devices as described in any one of claim 8-13, is characterized in that, generate described counterbalanced gate limit value by following formula:
K
1=Q
1×SOH （2）
K
2=Q
2×SOH （3）
Wherein, SOC is the state-of-charge of cell, Δ SOC
limitfor counterbalanced gate limit value, Δ SOC
beginfor the counterbalanced gate limit value of initial setting, Δ SOC
upper newthe electricity powered on for this is poor, Δ SOC
upper oldfor the previous electricity powered on is poor, Δ SOC
lower newfor the electricity of this lower electricity is poor, Δ SOC
lower oldfor the electricity of previous lower electricity is poor, K
1for Δ SOC
upper newand/or Δ SOC
upper oldto balanced threshold delta SOC
limitinfluence coefficient, K
2for Δ SOC
lower newand/or Δ SOC
lower oldto balanced threshold delta SOC
limitinfluence coefficient, SOH is the cycle life of battery pack, Q
1for SOH is to K
1influence coefficient, Q
2for SOH is to K
2influence coefficient.
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| CN102331560A (en) * | 2011-05-16 | 2012-01-25 | 中国科学院上海微系统与信息技术研究所 | Method for estimating state of charge of nickel-metal hydride battery |
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