CN104241713B - SOC (state of charge) correcting method and SOC correcting device of power battery - Google Patents
SOC (state of charge) correcting method and SOC correcting device of power battery Download PDFInfo
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- CN104241713B CN104241713B CN201310241998.XA CN201310241998A CN104241713B CN 104241713 B CN104241713 B CN 104241713B CN 201310241998 A CN201310241998 A CN 201310241998A CN 104241713 B CN104241713 B CN 104241713B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an SOC (state of charge) correcting method of a power battery. The SOC correcting method comprises the following steps: acquiring the estimation value and the exact value of the current SOC of the power battery; comparing the estimation value and the exact value, and judging whether the calculation value of the real-time SOC of the power battery, obtained based on the estimation value, needs to be corrected according to the compared result; if so, generating a correction coefficient according to the state of the power battery and the estimation value and the exact value of the current SOC of the power battery; and calculating the correction value of the real-time SOC of the power battery according to the input and output electricity quantity of the power battery, the correction coefficient and the estimation value of the power battery collected in real time. According to the method provided by the embodiment of the invention, the SOC value deviating from the exact value can be corrected smoothly to be relative exact SOC value, so that the method has the advantages that drivers cannot perceive the correction so as to be prevented from feeling uneasy. The invention also discloses an SOC correcting device of the power battery.
Description
Technical field
The present invention relates to field of automobile, particularly to a kind of state-of-charge soc modification method of electrokinetic cell
And device.
Background technology
In electric vehicle engineering, soc (the state of charge state-of-charge) estimation of electrokinetic cell is therein one
Individual key link, the current soc of correct display battery system can help driver to estimate remaining continual mileage, thus very
Important.The soc evaluation method generally being adopted is on the basis of electric quantity integration, adds open-circuit voltage correction, correction etc. of charging
Measure is eliminating cumulative errors, but accurate soc point (typically reaching the point that soc is 0% or the point for 100%) is being detected
And during as new integration starting point, if in the case of there is bigger difference with the old soc value originally calculating, directly
Connect using new integration starting point although more accurate, but the saltus step of soc will occur, thus causing the jump of instrument dump energy
Become, finally cause the uneasiness of driver.
It is currently based on electric quantity integration method and estimate shown in the principle equation below of soc:
Wherein soc0Refer to soc value when integrating initial, η refers to efficiency for charge-discharge, and i refers to charging and discharging currents, and c refers to battery capacity.
True soc when battery system dispatches from the factory is set as a certain value (as 50%) by battery producer by discharge and recharge, and bms is by its algorithm
In integration starting point soc0It is set as this value (as 50%), subsequently in driving and charging process, by bms (battery
Management system battery management system) it is filled with or releases the electricity of set of cells to detect, thus to determine in set of cells
Remaining electricity.
Ideally, this algorithm can follow the tracks of the dump energy of battery system, thus drawing the soc of battery system
As the reference of driver's residue continual mileage, but the reason such as self discharge of the cumulative errors due to bms and set of cells, with
The prolongation of Riming time of algorithm, the error between the soc that bms estimates and the real soc of set of cells will become increasing,
Lose reference significance the most at last.In order to solve the problems, such as cumulative errors and self discharge, the way generally adopting is by open circuit electricity
The corresponding relation with soc is pressed to revise initial value for integral.But because open-circuit voltage does not obtain at any time, only in battery
System exports input current and is 0 and is continued above the open-circuit voltage values that certain time (as 2h) could obtain battery, such, logical
Often start, in electric automobile morning, the open-circuit voltage values obtaining when (if night stagnation of movement) to pass through to table look-up to draw currently corresponding soc
Value, replaces the former soc initial value for integral preserving in bms as new initial value for integral.
It is defeated that prior art (the electric quantity accumulation method of open-circuit voltage auxiliary) its thought is based upon accumulative battery system input
The electricity ah number going out estimating soc, but when by open-circuit voltage correction, due to old soc initial value and new soc initial value it
Between there may be the larger difference of ratio, soc will sport new initial value by old initial value and (may not drive a vehicle in mutation process or fill
Electricity), so will result in the uneasiness of driver it is believed that soc pointer it is contemplated that beating in ground, is not causing the complaint of driver, shadow
Ring the public praise of vehicle.
Content of the invention
It is contemplated that at least solving one of above-mentioned technical problem.
For this reason, it is an object of the present invention to proposing a kind of state-of-charge soc modification method of electrokinetic cell.The method
The soc that exact value can be will deviate from smoothly is adapted to more accurately soc value, has the advantages that to cause driver to discover,
Avoid the uneasiness of driver.
Another object of the present invention is to proposing a kind of state-of-charge soc correcting device of electrokinetic cell.
To achieve these goals, the embodiment of first aspect present invention proposes a kind of state-of-charge of electrokinetic cell
Soc modification method, comprises the following steps: obtains the current estimated value of state-of-charge of electrokinetic cell and exact value；Relatively more described
Estimated value and exact value, and judged whether real-time to the described electrokinetic cell being worth to based on described estimation according to comparative result
The value of calculation of state-of-charge is modified；If it is, according to the current lotus of the state of described electrokinetic cell, described electrokinetic cell
The estimated value of electricity condition and exact value generate correction factor；And the input and output electricity of the described electrokinetic cell according to Real-time Collection
Amount, described correction factor and described estimated value calculate the correction value of the real-time state-of-charge of described electrokinetic cell.
The state-of-charge soc modification method of electrokinetic cell according to embodiments of the present invention, apparent soc and true soc it
Between when having differences, reduce the difference between apparent soc and true soc by the accumulative speed slowing down or accelerating electric quantity accumulation method
Different, it is finally reached consistent state, the mutation such that it is able to avoid soc causes driver to complain.In addition, apparent soc(revises
Value) will be with the consumption of electricity or increase linear change, it is easy to the remaining continual mileage of driver's prediction.
In addition, the state-of-charge soc modification method of electrokinetic cell according to the above embodiment of the present invention can also have as
Lower additional technical characteristic:
In some instances, the correction value of the real-time state-of-charge of described electrokinetic cell is obtained by equation below:
Wherein, soc0For described estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is to revise
Coefficient, η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
In some instances, wherein, if the state of described electrokinetic cell is charged state and described estimated value be more than or
Equal to described exact value, or the state of described electrokinetic cell is that discharge condition and described estimated value are less than described exact value, then
Described correction factor span is located at the value between (0,1)；If the state of described electrokinetic cell is charged state and described
Estimated value is less than described exact value, or the state of described electrokinetic cell is discharge condition and described estimated value more than or equal to institute
State exact value, then described correction factor value is the numerical value more than 1.
In some instances, wherein, if the state of described electrokinetic cell is discharge condition, described correction factor is:Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value；
In some instances, wherein, if the state of described electrokinetic cell is charged state, described correction factor is:Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value.
In some instances, also include: the input and output electricity of the described electrokinetic cell according to described Real-time Collection and institute
State the exact value that exact value calculates the real-time state-of-charge of described electrokinetic cell；When the real-time state-of-charge of described electrokinetic cell
When correction value is less than preset value with the difference of the exact value of the real-time state-of-charge of described electrokinetic cell in corresponding moment, stop to institute
State the real-time state-of-charge of electrokinetic cell to be modified.
In some instances, also include: the correction value of the display real-time state-of-charge of described electrokinetic cell.
The embodiment of another aspect of the present invention discloses a kind of state-of-charge soc correcting device of electrokinetic cell, comprising: obtain
Delivery block, for obtaining estimated value and the exact value of the current state-of-charge of electrokinetic cell；Judge module, for estimating described in comparison
Evaluation and exact value, and judged whether to the real-time lotus of described electrokinetic cell being worth to based on described estimation according to comparative result
The value of calculation of electricity condition is modified；Correction factor generation module, for according to the state of described electrokinetic cell, described power current
The estimated value of the current state-of-charge in pond and exact value generate correction factor；And correcting module, for according to Real-time Collection
It is charged in real time that the input and output electricity of described electrokinetic cell, described correction factor and described estimated value calculate described electrokinetic cell
The correction value of state.
The state-of-charge soc correcting device of electrokinetic cell according to embodiments of the present invention, apparent soc and true soc it
Between when having differences, reduce the difference between apparent soc and true soc by the accumulative speed slowing down or accelerating electric quantity accumulation method
Different, it is finally reached consistent state, the mutation such that it is able to avoid soc causes driver to complain.In addition, apparent soc(revises
Value) will be with the consumption of electricity or increase linear change, it is easy to the remaining continual mileage of driver's prediction.
In addition, the state-of-charge soc correcting device of electrokinetic cell according to the above embodiment of the present invention can also have as
Lower additional technical characteristic:
In some instances, the correction value of the real-time state-of-charge of described electrokinetic cell is obtained by equation below:
Wherein, soc0For described estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is to revise
Coefficient, η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
In some instances, also include: display module, for showing the correction of the real-time state-of-charge of described electrokinetic cell
Value.
The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
The above-mentioned and/or additional aspect of the present invention and advantage will become from reference to the description to embodiment for the accompanying drawings below
Substantially and easy to understand, wherein:
Fig. 1 is the flow chart of the state-of-charge soc modification method of electrokinetic cell according to an embodiment of the invention.
Fig. 2 is the particular flow sheet of the state-of-charge soc modification method according to one embodiment of the invention electrokinetic cell；With
And
Fig. 3 is the structure chart of the state-of-charge soc correcting device according to one embodiment of the invention electrokinetic cell.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", " on ", D score,
The orientation of instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outward " or position relationship are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark
Show the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint are relative
Importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can
To be to be mechanically connected or electrical connection；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
State-of-charge soc modification method below in conjunction with Description of Drawings electrokinetic cell according to embodiments of the present invention and dress
Put.
Fig. 1 is the flow chart of the state-of-charge soc modification method of electrokinetic cell according to an embodiment of the invention.As figure
Shown in 1, the state-of-charge soc modification method of this electrokinetic cell, comprise the steps:
Step s101: obtain the current estimated value of state-of-charge of electrokinetic cell and exact value.
Specifically, the estimated value of the current state-of-charge of electrokinetic cell can be estimated to obtain by electric quantity integration method, power
The exact value of the current state-of-charge of battery by gathering the open-circuit voltage values of electrokinetic cell, and can be worth according to open-circuit voltage
Arrive.
As a specific example, as shown in Fig. 2 when electrokinetic cell (abbreviation battery) dispatches from the factory, will be moved by discharge and recharge
The state-of-charge soc of the set of cells of power battery is adjusted to a certain value such as soc0, integrated with battery management system (bms) in set of cells
Afterwards, the soc initial value in bms is set to soc0 (matching with set of cells virtual condition), completes step " soc just value calibration ".
Electrokinetic cell (being integrated with bms and battery component) onboard bring into operation after a period of time after, vehicle
Stagnation of movement exceedes a period of time (such as 2 hours, depending on different battery types, are defined), charged shape can obtain accurate soc
State is changed into soc1, and when vehicle is restarted, bms collects open-circuit voltage and draws one according to the corresponding relation of open-circuit voltage and soc
Individual more accurately SOC soc2.Now it is believed that soc1 is above-mentioned estimated value, soc2 is exact value.
Step s102: compare estimated value and exact value, and judged whether to based on estimating to be worth to according to comparative result
The value of calculation of the real-time state-of-charge of electrokinetic cell is modified.
Specifically, due to the cumulative error of electrokinetic cell self discharge and the estimated value of bms calculating, may result in estimated value
Different with exact value, therefore, when comparing estimated value and being different with exact value, or difference between the two is more than a certain threshold value
When, judge to need to be modified to based on the value of calculation estimating the real-time state-of-charge of electrokinetic cell being worth to.Wherein, this threshold
Value can rule of thumb preset.
Step s103: if it is, according to the estimated value of the current state-of-charge of the state of electrokinetic cell, electrokinetic cell and
Exact value generates correction factor.Judging to need to the calculating based on the real-time state-of-charge of electrokinetic cell estimating to be worth to
When value is modified, such as when above-mentioned estimated value differs more with actual value, then can be according to the state of electrokinetic cell, dynamic
The estimated value of the current state-of-charge of power battery and exact value generate correction factor.
Specifically, if for charged state and estimated value is more than or equal to exact value to the state of electrokinetic cell or dynamic
For discharge condition and estimated value is less than exact value to the state of power battery, then correction factor span is located at the value between (0,1)；
If the state of electrokinetic cell is charged state and estimated value is less than exact value, or the state of electrokinetic cell be discharge condition and
Estimated value is more than or equal to exact value, then correction factor value is the numerical value more than 1.
In one embodiment of the invention, if the state of electrokinetic cell is discharge condition, correction factor isWherein, k is correction factor, and soc1 is estimated value, and soc2 is exact value.
Additionally, if the state of electrokinetic cell is charged state, correction factor is:Wherein, k is to repair
Positive coefficient, soc1 is estimated value, and soc2 is exact value.
Step s104: the input and output electricity of the electrokinetic cell according to Real-time Collection, correction factor and estimated value calculate dynamic
The correction value of the real-time state-of-charge of power battery.
Specifically, in conjunction with shown in Fig. 2, such as when being calculated soc2 and soc1, and between having differences.
Battery management system bms memorizer above-mentioned two soc can be passed through, i.e. soc1 and soc2, soc2 are that more to meet battery reality charged
State, and soc1 to be driver paid close attention to originally always its change thus familiar soc value, if at this time following
Vehicle operation in directly replace soc1 as the initial value of electric quantity integration with soc2, particularly do not driving a vehicle or charging
It is replaced in the case of (not having electric current), driver can be aware of obvious soc mutation process, it will produce complaint.
Now, the method for embodiments of the invention is still using soc1 as electric quantity accumulation in following vehicle operation
Integration starting point, has two kinds of situations, soc1>=soc2 and soc1<soc2；In soc1 >=soc2, i.e. exact value (exact value soc2)
In the case of show value (estimated value soc1), be divided into two kinds of situations again, charging operating mode (charged state of electrokinetic cell) and
Electric discharge operating mode (discharge condition of electrokinetic cell), under charging operating mode, the true carrying capacity of set of cells is being gradually increased, at this time
If carry out the estimation of soc according to electric quantity integration method, because apparent SOC is (with soc1 for integrating the state-of-charge of starting point
Value) it is higher than real soc, apparent state-of-charge will reach charge termination 100% in advance；And under electric discharge operating mode, due to battery
The true carrying capacity of group is being gradually reduced, and apparent soc will delay and reach electric discharge terminal；The method of the embodiment of the present invention is using subtracting
Slow or accelerate apparent soc(value of calculation) add up the method for speed to make apparent soc and true soc coincide, the scheme being adopted can
Multiple to have, the correction value of the real-time state-of-charge of the present embodiment electrokinetic cell is obtained by equation below:
Wherein, soc0For estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is correction factor,
η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
This correction factor k adopts the number (as 0.5) less than 1 when needing to delay integrating rate, and is needing to accelerate integration
Using the number (as 2) more than 1 when speed, the numerical values recited of correction factor is depending on difference between soc1 and soc2, and is
Can calibration value, drawn by real steering vectors.
After apparent soc and true soc coincide, this coefficient can be set to 1.I.e. the method for the embodiment of the present invention can be according to reality
When the input and output electricity of electrokinetic cell that gathers and exact value calculate the exact value of the real-time state-of-charge of electrokinetic cell；When dynamic
The correction value of the real-time state-of-charge of power battery is little with the difference of the exact value of the real-time state-of-charge of the electrokinetic cell in corresponding moment
When preset value, to electrokinetic cell, real-time state-of-charge is modified for stopping.
In addition, under soc1 < soc2, judging whether vehicle is in driving operating mode (charged state of electrokinetic cell), it is expert at
Under turner condition, slow down the accumulative speed of apparent soc, under charging operating mode, accelerate the accumulative speed of soc.The speed slowing down and accelerating
Degree, is equally determined by correction factor k.For example: in discharge process, k value takes above-mentionedIn charging process, k
For example take above-mentioned
Advantage using as above value is that the soc estimating is even during whole electric quantity accumulation method estimation soc
Speed change, is not in mutation, is conducive to the remaining continual mileage of driver's estimation；In addition carry out the value of k using above-mentioned formula
When, apparent soc and accurate soc can reach 100% or 0% simultaneously.It is however noted that, correction factor k value is only to speed up
Or slow down a kind of method that energy accumulation approach adds up speed, in other examples of the present invention, also additive method can use, and such as presses
Reduced with soc1 for integration starting point with soc2 for integrating the charged of starting point gained with 0.1% speed fall according to each calculating cycle
The method of the difference between state estimation value.
In order to there be clearer understanding to the embodiment of the present invention, with soc1 > soc2 and turner condition of being expert at (the putting of electrokinetic cell
Electricity condition) under as a example, in conjunction with shown in Fig. 2, soc5 is accumulated by for starting point according to proper integral speed with soc2, with soc1 for rise
Point is accelerated electric quantity integration speed and is obtained soc3；Originally soc3 be more than soc5, but due to soc3 accelerates in driving minimizing (with
Soc5 compares), when soc3 is to during less than or equal to soc5, having shown to accelerate SOC that accumulative electric quantity integration method estimates
Through catching up with exact value, at this time coefficient k value is set to 1.Other situations soc1 <under soc2 or charging operating mode, are similar to.When apparent lotus
When electricity condition value is matched with exact value, estimation soc is continued using the energy accumulation approach of normal speed.
In one embodiment of the invention, the method also includes: the correction of the display real-time state-of-charge of electrokinetic cell
Value.For example the correction value of real-time for electrokinetic cell state-of-charge is shown to by user by instrumental panel, so that user understands in real time
The real-time state-of-charge of electrokinetic cell.
The state-of-charge soc modification method of electrokinetic cell according to embodiments of the present invention, apparent soc and true soc it
Between when having differences, reduce the difference between apparent soc and true soc by the accumulative speed slowing down or accelerating electric quantity accumulation method
Different, it is finally reached consistent state, the mutation such that it is able to avoid soc causes driver to complain.For example: if original bms
The soc of memorizer is 50%, and tying up to, by the pass of open-circuit voltage and soc, the accurate soc drawing during bms start is 40%, if
Directly replaced " 50% " with " 40% ", driver will produce uneasiness.Lotus using the electrokinetic cell of the embodiment of the present invention
Electricity condition soc modification method, start correction has been hidden in driving or charging process, and has employed the method gradually changing,
The appearance of the problems referred to above can be avoided, lower the complaint of user, have the advantages that to cause driver to discover, it is to avoid driver's
Uneasy.In addition, apparent soc(correction value) will be with the consumption of electricity or increase linear change, it is easy to driver's prediction surplus
Remaining continual mileage.
The structure chart of the state-of-charge soc correcting device of electrokinetic cell according to an embodiment of the invention during Fig. 3.As figure
Shown in 3, the state-of-charge soc correcting device 300 of this electrokinetic cell, comprising: acquisition module 310, judge module 320, correction system
Number generation module 330 and correcting module 340.
Wherein, acquisition module 310 is used for obtaining estimated value and the exact value of the current state-of-charge of electrokinetic cell.Judge mould
Block 320 is used for comparing estimated value and exact value, and is judged whether to the electrokinetic cell being worth to based on estimation according to comparative result
The value of calculation of state-of-charge is modified in real time.Correction factor generation module 330 is used for according to the state of electrokinetic cell, power
The estimated value of the current state-of-charge of battery and exact value generate correction factor.Correcting module 340 is used for according to Real-time Collection
The input and output electricity of electrokinetic cell, correction factor and estimated value calculate the correction value of the real-time state-of-charge of electrokinetic cell.
In one embodiment of the invention, the correction value of the real-time state-of-charge of electrokinetic cell is obtained by equation below
Arrive:
Wherein, soc0For estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is correction factor,
η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
Specifically, in conjunction with shown in Fig. 2, such as when being calculated soc2 and soc1, and between having differences.
Battery management system bms memorizer above-mentioned two soc can be passed through, i.e. soc1 and soc2, soc2 are that more to meet battery reality charged
State, and soc1 to be driver paid close attention to originally always its change thus familiar soc value, if at this time following
Vehicle operation in directly replace soc1 as the initial value of electric quantity integration with soc2, particularly do not driving a vehicle or charging
It is replaced in the case of (not having electric current), driver can be aware of obvious soc mutation process, it will produce complaint.
Now, the method for embodiments of the invention is still using soc1 as electric quantity accumulation in following vehicle operation
Integration starting point, has two kinds of situations, soc1>=soc2 and soc1<soc2；In soc1 >=soc2, that is, exact value soc2 is less than display
In the case of value (estimated value soc1), it is divided into two kinds of situations, charging operating mode (charged state of electrokinetic cell) and electric discharge operating mode again
(discharge condition of electrokinetic cell), under charging operating mode, the true carrying capacity of set of cells being gradually increased, if at this time according to
Electric quantity integration method carries out the estimation of soc, because apparent SOC (with soc1 for integrating the SOC of starting point) is higher than
Real soc, apparent state-of-charge will reach charge termination 100% in advance；And under electric discharge operating mode, true due to set of cells
Real carrying capacity is being gradually reduced, and apparent soc will delay and reach electric discharge terminal；The method of the embodiment of the present invention using slow down or plus
Apparent soc(value of calculation soon) add up the method for speed to make apparent soc and true soc coincide, the scheme being adopted can have many
Kind, the correction value of the real-time state-of-charge of the present embodiment electrokinetic cell is obtained by equation below:
Wherein, soc0For estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is correction factor,
η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
This correction factor k adopts the number (as 0.5) less than 1 when needing to delay integrating rate, and is needing to accelerate integration
Using the number (as 2) more than 1 when speed, the numerical values recited of correction factor is depending on difference between soc1 and soc2, and is
Can calibration value, drawn by real steering vectors.
After apparent soc and true soc coincide, this coefficient can be set to 1.I.e. the method for the embodiment of the present invention can be according to reality
When the input and output electricity of electrokinetic cell that gathers and exact value calculate the exact value of the real-time state-of-charge of electrokinetic cell；When dynamic
The correction value of the real-time state-of-charge of power battery is little with the difference of the exact value of the real-time state-of-charge of the electrokinetic cell in corresponding moment
When preset value, to electrokinetic cell, real-time state-of-charge is modified for stopping.
In addition, under soc1 < soc2, judging whether vehicle is in driving operating mode (charged state of electrokinetic cell), it is expert at
Under turner condition, slow down the accumulative speed of apparent soc, under charging operating mode, accelerate the accumulative speed of soc.The speed slowing down and accelerating
Degree, is equally determined by correction factor k.For example: in discharge process, k value takes above-mentionedIn charging process, k
For example take above-mentioned
Advantage using as above value is that the soc estimating is even during whole electric quantity accumulation method estimation soc
Speed change, is not in mutation, is conducive to the remaining continual mileage of driver's estimation；In addition carry out the value of k using above-mentioned formula
When, apparent soc and accurate soc can reach 100% or 0% simultaneously.It is however noted that, correction factor k value is only to speed up
Or slow down a kind of method that energy accumulation approach adds up speed, in other examples of the present invention, also additive method can use, and such as presses
Reduced with soc1 for integration starting point with soc2 for integrating the charged of starting point gained with 0.1% speed fall according to each calculating cycle
The method of the difference between state estimation value.
In order to there be clearer understanding to the embodiment of the present invention, with soc1 > soc2 and turner condition of being expert at (the putting of electrokinetic cell
Electricity condition) under as a example, in conjunction with shown in Fig. 2, soc5 is accumulated by for starting point according to proper integral speed with soc2, with soc1 for rise
Point is accelerated electric quantity integration speed and is obtained soc3；Originally soc3 be more than soc5, but due to soc3 accelerates in driving minimizing (with
Soc5 compares), when soc3 is to during less than or equal to soc5, having shown to accelerate SOC that accumulative electric quantity integration method estimates
Through catching up with exact value, at this time coefficient k value is set to 1.Other situations soc1 <under soc2 or charging operating mode, are similar to.When apparent lotus
When electricity condition value is matched with exact value, estimation soc is continued using the energy accumulation approach of normal speed.
In one embodiment of the invention, this device also includes: display module (not shown), for showing power
The correction value of the real-time state-of-charge of battery.Show the correction value of the real-time state-of-charge of electrokinetic cell.For example pass through instrument
The correction value of real-time for electrokinetic cell state-of-charge is shown to user by disk (using as display module), so that user is real-time
The solution real-time state-of-charge of electrokinetic cell.
The state-of-charge soc correcting device of electrokinetic cell according to embodiments of the present invention, apparent soc and true soc it
Between when having differences, reduce the difference between apparent soc and true soc by the accumulative speed slowing down or accelerating electric quantity accumulation method
Different, it is finally reached consistent state, the mutation such that it is able to avoid soc causes driver to complain.For example: if original bms
The soc of memorizer is 50%, and tying up to, by the pass of open-circuit voltage and soc, the accurate soc drawing during bms start is 40%, if
Directly replaced " 50% " with " 40% ", driver will produce uneasiness.Lotus using the electrokinetic cell of the embodiment of the present invention
Electricity condition soc correcting device, start correction has been hidden in driving or charging process, and has employed the method gradually changing,
The appearance of the problems referred to above can be avoided, lower the complaint of user, have the advantages that to cause driver to discover, it is to avoid driver's
Uneasy.In addition, apparent soc(correction value) will be with the consumption of electricity or increase linear change, it is easy to driver's prediction surplus
Remaining continual mileage.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
Multiple changes, modification, replacement and modification can be carried out to these embodiments in the case of the principle of the disengaging present invention and objective, this
The scope of invention by claim and its is equal to limit.
Claims (6)
1. a kind of state-of-charge soc modification method of electrokinetic cell is it is characterised in that comprise the following steps:
Obtain the current estimated value of state-of-charge of electrokinetic cell and exact value；
Relatively described estimated value and exact value, and judged whether described dynamic to be worth to based on described estimation according to comparative result
The value of calculation of the real-time state-of-charge of power battery is modified；
If it is, according to the estimated value of the current state-of-charge of the state of described electrokinetic cell, described electrokinetic cell and accurately
Value generates correction factor, wherein,
If the state of described electrokinetic cell is discharge condition, described correction factor is:
Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value,
If the state of described electrokinetic cell is charged state, described correction factor is:
Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value；And
Described in the input and output electricity of the described electrokinetic cell according to Real-time Collection, described correction factor and described estimated value calculate
The correction value of the real-time state-of-charge of electrokinetic cell, wherein, the correction value of the real-time state-of-charge of described electrokinetic cell is passed through such as
Lower formula obtains:
Wherein, soc0For described estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is correction factor,
η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
2. method according to claim 1 is it is characterised in that wherein,
If for charged state and described estimated value is more than or equal to described exact value to the state of described electrokinetic cell, or described
For discharge condition and described estimated value is less than described exact value to the state of electrokinetic cell, then described correction factor span is located at
Value between (0,1)；
If for charged state and described estimated value is less than described exact value to the state of described electrokinetic cell, or described power current
The state in pond is that discharge condition and described estimated value are more than or equal to described exact value, then described correction factor value be more than or
Numerical value equal to 1.
3. method according to claim 1, also includes:
The input and output electricity of the described electrokinetic cell according to described Real-time Collection and described exact value calculate described electrokinetic cell
The exact value of state-of-charge in real time；
Described electrokinetic cell charged shape in real time when correction value and the corresponding moment of the real-time state-of-charge of described electrokinetic cell
When the difference of the exact value of state is less than preset value, to described electrokinetic cell, real-time state-of-charge is modified for stopping.
4. method according to claim 1, also includes:
Show the correction value of the real-time state-of-charge of described electrokinetic cell.
5. a kind of state-of-charge soc correcting device of electrokinetic cell is it is characterised in that include:
Acquisition module, for obtaining estimated value and the exact value of the current state-of-charge of electrokinetic cell；
Judge module, for relatively described estimated value and exact value, and judges whether to based on described estimation according to comparative result
The value of calculation of the real-time state-of-charge of described electrokinetic cell being worth to is modified；
Correction factor generation module, for the state-of-charge current according to the state of described electrokinetic cell, described electrokinetic cell
Estimated value and exact value generate correction factor, wherein,
If the state of described electrokinetic cell is discharge condition, described correction factor is:
Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value,
If the state of described electrokinetic cell is charged state, described correction factor is:
Wherein, described k is correction factor, and described soc1 is described estimated value, and described soc2 is described exact value；And
Correcting module, for the input and output electricity of the described electrokinetic cell according to Real-time Collection, described correction factor and described
Estimated value calculates the correction value of the real-time state-of-charge of described electrokinetic cell, wherein, the real-time state-of-charge of described electrokinetic cell
Correction value obtained by equation below:
Wherein, soc0For described estimated value, soctFor the correction value of the state-of-charge in t for the electrokinetic cell, k is correction factor,
η is electrokinetic cell efficiency for charge-discharge, and i is electrokinetic cell charging and discharging currents, and c is electrokinetic cell capacity.
6. device according to claim 5 is it is characterised in that also include:
Display module, for showing the correction value of the real-time state-of-charge of described electrokinetic cell.
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| CN201310241998.XA CN104241713B (en) | 2013-06-18 | 2013-06-18 | SOC (state of charge) correcting method and SOC correcting device of power battery |
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Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974323B (en) * | 2016-05-09 | 2019-04-12 | 深圳市鑫成泰科技有限公司 | A kind of algorithm model improving electric car SOC estimation precision |
| CN106125006B (en) * | 2016-08-31 | 2019-02-15 | 北京海博思创科技有限公司 | Battery charge state determines method and device |
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| CN107069118B (en) * | 2016-12-26 | 2019-08-20 | 惠州市蓝微新源技术有限公司 | The modification method of SOC under a kind of cryogenic conditions |
| CN106646268B (en) * | 2017-03-07 | 2019-03-08 | 安徽江淮汽车集团股份有限公司 | The SOC compensation method of power battery |
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| CN108445405A (en) * | 2018-03-07 | 2018-08-24 | 湖南小步科技有限公司 | SOC modification methods, device and battery management system in a kind of charge and discharge process |
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| CN110324382A (en) * | 2018-03-30 | 2019-10-11 | 比亚迪股份有限公司 | Electric car and its data processing system and data processing method |
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| CN109507595A (en) * | 2018-12-28 | 2019-03-22 | 贵安新区新特电动汽车工业有限公司 | Battery SOC dynamic calibration method, device and electronic equipment |
| CN109613432A (en) * | 2019-01-08 | 2019-04-12 | 广州小鹏汽车科技有限公司 | Estimate method, equipment and the computer readable storage medium of battery charge state |
| CN110190649B (en) * | 2019-06-01 | 2020-12-29 | 深圳市永航新能源技术有限公司 | Battery capacity evaluation correction charging and discharging device and correction method |
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| CN110927580A (en) * | 2019-11-05 | 2020-03-27 | 深圳市科陆电子科技股份有限公司 | SOC deviation correction method, device, terminal and storage medium |
| CN112952225B (en) * | 2019-12-11 | 2023-05-23 | 中车时代电动汽车股份有限公司 | SOC correction method and device for battery system |
| CN113131012B (en) * | 2019-12-30 | 2023-04-28 | 杭州海康机器人股份有限公司 | Determination method and device for SOC estimation precision and storage medium |
| CN113119761B (en) * | 2019-12-31 | 2023-06-16 | 北京新能源汽车股份有限公司 | Power battery charging rate adjusting method and device |
| CN113533964B (en) * | 2020-03-30 | 2024-02-13 | 郑州深澜动力科技有限公司 | Calculation method and device for displaying state of charge |
| CN111976542B (en) * | 2020-09-01 | 2022-06-14 | 广东高标电子科技有限公司 | SOC estimation method and device for lead-acid battery of electric vehicle |
| CN112433156A (en) * | 2020-11-18 | 2021-03-02 | 深圳市科信通信技术股份有限公司 | SOC estimation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359036A (en) * | 2007-07-31 | 2009-02-04 | 比亚迪股份有限公司 | Method for measuring state of charge of battery |
| CN101379409A (en) * | 2006-02-09 | 2009-03-04 | 丰田自动车株式会社 | Secondary cell residual capacity estimating device and residual capacity estimating method |
| CN102540083A (en) * | 2010-10-13 | 2012-07-04 | 三星Sdi株式会社 | Battery management system and method of estimating battery state of charge |
| CN102933977A (en) * | 2010-06-08 | 2013-02-13 | 日产自动车株式会社 | Battery capacity display apparatus and battery capacity display method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005227164A (en) * | 2004-02-13 | 2005-08-25 | Toyota Motor Corp | Device for calculating state of charge of secondary cell |
| FR2981754B1 (en) * | 2011-10-24 | 2013-11-29 | Renault Sa | METHOD AND SYSTEM FOR DETERMINING THE CHARGE STATE OF AN ELEMENTARY CELL AND BATTERY |
-
2013
- 2013-06-18 CN CN201310241998.XA patent/CN104241713B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101379409A (en) * | 2006-02-09 | 2009-03-04 | 丰田自动车株式会社 | Secondary cell residual capacity estimating device and residual capacity estimating method |
| CN101359036A (en) * | 2007-07-31 | 2009-02-04 | 比亚迪股份有限公司 | Method for measuring state of charge of battery |
| CN102933977A (en) * | 2010-06-08 | 2013-02-13 | 日产自动车株式会社 | Battery capacity display apparatus and battery capacity display method |
| CN102540083A (en) * | 2010-10-13 | 2012-07-04 | 三星Sdi株式会社 | Battery management system and method of estimating battery state of charge |
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