CN106872906B - A kind of method and system based on OCV curve amendment SOC - Google Patents
A kind of method and system based on OCV curve amendment SOC Download PDFInfo
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- CN106872906B CN106872906B CN201710150828.9A CN201710150828A CN106872906B CN 106872906 B CN106872906 B CN 106872906B CN 201710150828 A CN201710150828 A CN 201710150828A CN 106872906 B CN106872906 B CN 106872906B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The present invention relates to a kind of method and systems based on OCV curve amendment SOC, this method comprises: obtaining the residual SOC value SOC for the battery that n-th measuresn, and according to SOCnValue calculates the current SOC value SOC of (n+1)th batteryn+1；The currently practical voltage value U and current actual temperature value T for obtaining battery, inquiry is in standard OCV diagram database to obtain standard SOC value SOC corresponding to batteryMark；If SOCn+1With SOCMarkBetween difference when being greater than 5%, then SOC value after the battery is corrected is SOCIt repairs=(SOCn+1‑SOCn)*0.1+SOCn.The present invention can carry out in real time effectively amendment to the SOC value of battery in practical applications and improve the overall precision of SOC estimated value so that the SOC value of battery is more nearly standard SOC value corresponding in standard OCV curve, meet practical application request.
Description
Technical field
The present invention relates to battery SOC technical field, in particular to a kind of method and system based on OCV curve amendment SOC.
Background technique
In electric car field, battery is a particularly important power resources.And for automobile batteries, charged shape
State SOC is an important indicator for measuring its performance.Specifically, state-of-charge SOC is referred to when battery used one section
Between or for a long time lie idle after residual capacity and its it is fully charged when rated capacity ratio.Wherein, SOC=100% is
Indicate that battery is in full state, SOC=0% indicates that battery is in emptying state.
In practical applications, can the SOC value of battery be always that researchers grind in battery management system by accurate estimation
Study carefully a weight difficulties in field.In general, battery is opened or closed state, temperature, electricity in the use process of battery
Flow valuve, degree of aging and self-discharge rate etc. can all directly influence the estimation of SOC value of battery, so that the SOC estimated value of battery
It differs greatly with SOC value corresponding in the OCV curve of standard when factory, if not to the SOC estimated value of above-mentioned automobile batteries
It is effectively corrected in time, will directly affect and even mislead judgement of the user to the automobile batteries current state, reduce user
Actual use experience.
Summary of the invention
Based on this, the purpose of the present invention is to propose to one kind can to SOC value of battery carry out in real time effectively modified method with
System improves SOC estimated value so that the SOC value of battery is more nearly standard SOC value corresponding in standard OCV curve
Overall precision, meet practical application request.
The present invention proposes a kind of method based on OCV curve amendment SOC, is applied to batteries of electric automobile, wherein including such as
Lower step:
The residual SOC value for the automobile batteries that n-th measures is obtained, and is calculated (n+1)th time according to the residual SOC value
The automobile batteries current SOC value, the residual SOC value that wherein n-th measures be SOCn, it is calculated for (n+1)th time
The current SOC value be SOCn+1, n≤1；
The (n+1)th currently practical voltage value and current actual temperature value for obtaining the automobile batteries, according to described
Currently practical voltage value and the current actual temperature value are inquired in standard OCV diagram database to obtain the vapour
Standard SOC value corresponding to vehicle battery, the standard SOC value are denoted as SOCMark；
If the SOCn+1With the SOCMarkBetween difference be greater than 5% when, then according to formula S OCIt repairs=(SOCn+1-
SOCn)*0.1+SOCnTo the SOCn+1It is modified.
The method based on OCV curve amendment SOC, wherein described to obtain the residual of the automobile batteries that measures of n-th
SOC value is stayed, and the step of current SOC value for the automobile batteries for calculating (n+1)th time according to the residual SOC value includes:
Obtain the residual SOC value SOC for the automobile batteries that n-th measuresn；
Between time when obtaining the charge and discharge flow valuve I of (n+1)th automobile batteries and being measured apart from the n-th
Every t；
According to the residual SOC value SOCn, the charge and discharge flow valuve I and the time interval t be calculated (n+1)th time
The automobile batteries the current SOC value SOCn+1。
The method based on OCV curve amendment SOC, wherein described according to the residual SOC value SOCn, the charge and discharge
The current SOC value SOC of (n+1)th automobile batteries is calculated in the current value I and time interval tn+1Step
Suddenly include:
The charge and discharge flow valuve I and the time interval t are integrated to obtain electric quantity change value；
The electric quantity change value is obtained into SOC changing value Δ SOC divided by the specified electric quantity of the automobile batteries, and by institute
State SOC changing value Δ SOC and the residual SOC value SOCnMake and/difference is to obtain the current SOC value SOCn+1。
The method based on OCV curve amendment SOC, wherein in (n+1)th current reality for obtaining the automobile batteries
Border voltage value and current actual temperature value, according to the currently practical voltage value and the current actual temperature value in standard
In the step of being inquired in OCV diagram database to obtain standard SOC value corresponding to the automobile batteries, the method packet
It includes:
Judge (n+1)th current SOC value SOC being calculatedn+1Whether 20% is greater than and less than 80%；
If so, the (n+1)th currently practical voltage value and current actual temperature value of the automobile batteries are obtained, and
It is inquired in the standard OCV diagram database according to the currently practical voltage value and the current actual temperature value
To obtain standard SOC value SOC corresponding to the automobile batteriesMark。
The method based on OCV curve amendment SOC, wherein the automobile batteries includes multiple single batteries, Mei Gesuo
It states single battery and respectively corresponds a cell voltage value, (n+1)th currently practical voltage value for obtaining the automobile batteries
The step of include:
Minimum cell voltage value corresponding to the minimum single battery of a voltage value is obtained in the multiple single battery
U0, internal resistance value r and the charge and discharge flow valuve I；
According to formula U=U0- I*r is to obtain the currently practical voltage value of the automobile batteries.
The present invention also proposes a kind of system based on OCV curve amendment SOC, is applied to batteries of electric automobile, wherein described
System includes:
COMPREHENSIVE CALCULATING module, for obtaining the residual SOC value for the automobile batteries that n-th measures, and according to described residual
SOC value is stayed to calculate the current SOC value of (n+1)th automobile batteries, the residual SOC value that wherein n-th measures is
SOCn, (n+1)th current SOC value being calculated is SOCn+1, n≤1；
Actual queries module, for obtaining (n+1)th currently practical voltage value of the automobile batteries and current real
Border temperature value, according to the currently practical voltage value and the current actual temperature value in standard OCV diagram database into
To obtain standard SOC value corresponding to the automobile batteries, the standard SOC value is denoted as SOC for row inquiryMark；
Value revision module, if being used for the SOCn+1With the SOCMarkBetween difference be greater than 5% when, then according to formula
SOCIt repairs=(SOCn+1-SOCn)*0.1+SOCnTo the SOCn+1It is modified.
The system based on OCV curve amendment SOC, wherein the COMPREHENSIVE CALCULATING module includes:
First acquisition unit, for obtaining the residual SOC value SOC for the automobile batteries that n-th measuresn；
Second acquisition unit, for obtaining the charge and discharge flow valuve I of (n+1)th automobile batteries and apart from described
Time interval t when n times measure；
SOC computing unit, for according to the residual SOC value SOCn, the charge and discharge flow valuve I and the time interval
The current SOC value SOC of (n+1)th automobile batteries is calculated in tn+1。
The system based on OCV curve amendment SOC, wherein the SOC computing unit includes:
Electric quantity integration unit, for being integrated the charge and discharge flow valuve I and the time interval t to obtain electricity
Changing value；
Basic processing unit, for by the electric quantity change value divided by the specified electric quantity of the automobile batteries to obtain SOC
Changing value Δ SOC, and by the SOC changing value Δ SOC and the residual SOC value SOCnMake and/difference is to obtain the current SOC
Value SOCn+1。
The system based on OCV curve amendment SOC, wherein the system also includes:
Data judgment module, for judging (n+1)th current SOC value SOC being calculatedn+1Whether 20% is greater than
And less than 80%；
The actual queries module is also used to as (n+1)th current SOC value SOC being calculatedn+1Greater than 20% and
When less than 80%, then the described (n+1)th time currently practical voltage value and current actual temperature value of the automobile batteries are obtained,
And it is looked into the standard OCV diagram database according to the currently practical voltage value and the current actual temperature value
It askes to obtain standard SOC value SOC corresponding to the automobile batteriesMark。
The system based on OCV curve amendment SOC, wherein the automobile batteries includes multiple single batteries, Mei Gesuo
It states single battery and respectively corresponds a cell voltage value, the actual queries module includes:
Single battery detection unit, for obtaining the minimum single battery institute of a voltage value in the multiple single battery
Corresponding minimum cell voltage value U0, internal resistance value r and the charge and discharge flow valuve I；
Voltage confirmation unit, for according to formula U=U0- I*r is to obtain the currently practical electricity of the automobile batteries
Pressure value.
The present invention proposes a kind of method and system based on OCV curve amendment SOC, in practical applications can be to battery
SOC value is corrected effectively in real time, so that the SOC value of battery is more nearly standard SOC corresponding in standard OCV curve
Value, improves the overall precision of SOC estimated value, meets practical application request.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of the method based on OCV curve amendment SOC in first embodiment of the invention；
Fig. 2 is a kind of flow chart of the method based on OCV curve amendment SOC in second embodiment of the invention；
Fig. 3 is a kind of structural schematic diagram of the system based on OCV curve amendment SOC in third embodiment of the invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to the disclosure.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Fig. 1, the method for one of first embodiment based on OCV curve amendment SOC, is applied to electronic vapour
Vehicle battery, includes the following steps:
S101, obtains the residual SOC value of the automobile batteries that n-th measures, and according to residual SOC value calculating the
The current SOC value of the n+1 automobile batteries, the residual SOC value that wherein n-th measures are SOCn, (n+1)th calculating
The obtained current SOC value is SOCn+1, n≤1.
Specifically, operation is typically all to pass through battery management system BMS with control for automobile batteries
(BATTERYMANAGEMENT SYSTEM) Lai Shixian's, single-chip microcontroller is provided in battery management system BMS, in single-chip microcontroller
EEPROM is used to record the SOC value and residual electric quantity of above-mentioned automobile batteries in real time.
In the present embodiment, the residual SOC value SOC for the automobile batteries that n-th measures first is obtainedn, and according to described
Remain SOC value SOCnCalculate the current SOC value SOC of (n+1)th automobile batteriesn+1.Namely first record battery described in last time
The remaining SOC value SOC of instituten, the remaining SOC value SOC that was then recorded according to last timenTo calculate the SOC value of presently described battery
SOCn+1.For example, battery described in last time is in off state, the EEPROM record in the single-chip microcontroller is also that the battery exists
The remaining SOC value SOC of close moment instituten, such as SOC at this timenValue be 65%.Then the utilization when being again turned on the battery
Ampere-hour method calculates at this time corresponding current SOC value SOCn+1.Specifically, carrying out calculating the current SOC using ampere-hour method
Value SOCn+1When, if battery described in the period calculated from last registration to this carry out be electric discharge operation if,
It is then integrated to obtain corresponding electric quantity change value with time interval t using corresponding discharge current value I, then by the electricity
Changing value obtains SOC changing value Δ SOC divided by the specified electric quantity of the automobile batteries, is obtaining the SOC changing value Δ SOC
Later, by the residual SOC value SOCnIt subtracts SOC changing value Δ SOC and just obtains current SOC value SOCn+1, such as institute is calculated at this time
Obtained SOCn+1Value be 61%.
It should be noted that in the present embodiment, n can be to be arbitrarily large in 1 integer, and n and n+1 only refer to
It SOC is carried out to the battery twice measures to be adjacent and current SOC value SOC is calculated using ampere-hour methodn+1.In addition, above-mentioned
Remain SOC value SOCnIt is to extract to obtain from the related data stored in the EEPROM in single-chip microcontroller.
S102 obtains the (n+1)th currently practical voltage value and current actual temperature value of the automobile batteries, according to
The currently practical voltage value and the current actual temperature value are inquired in standard OCV diagram database to obtain
Standard SOC value corresponding to automobile batteries is stated, the standard SOC value is denoted as SOCMark。
As described above, the battery (n+1)th time current SOC value SOC has been calculated using ampere-hour methodn+1(for example,
61%) after, due to needing that resulting current SOC value SOC will be calculatedn+1With standard SOC corresponding in the OCV curve of standard
Value SOCMarkIt compares, and inquires corresponding standard SOC value SOC in standard OCV curveMarkWhen need working as according to the battery
Preceding actual voltage value U and current actual temperature value T are inquired.
For the currently practical voltage value U, since the automobile batteries includes multiple single batteries, and each institute
It states single battery and has all respectively corresponded a cell voltage value.Specifically, the currently practical voltage value U of the battery is obtained, it is first
First need to confirm minimum cell voltage value U corresponding to voltage is minimum in the multiple single battery that battery0And
In addition to this corresponding internal resistance value r if the battery is in charged state, obtains charging current corresponding to the battery
I；If the battery is in discharge condition, discharge current I corresponding to the battery is obtained.Then according to formula U=U0-I*
R finally confirms the size of the currently practical voltage value U of the battery.At the same time, for the current actual temperature
For value T, which obtained by the temperature detecting element detection being arranged in battery management system BMS
's.
After it confirmed the currently practical voltage value U and current actual temperature value T, since the automobile batteries exists
The OCV curve of a standard is corresponding with when factory, according to the currently practical voltage value U and current actual temperature value T of above-mentioned acquisition
Corresponding standard SOC value SOC is searched in standard OCV curveMarkSo as to the resulting current SOC value SOC of above-mentioned calculatingn+1It carries out
Compare.
S103, if the SOCn+1With the SOCMarkBetween difference be greater than 5% when, then according to formula S OCIt repairs=(SOCn+1-
SOCn)*0.1+SOCnTo the SOCn+1It is modified.
It confirmed the current SOC value SOCn+1And the standard SOC value SOCMarkSize after, will be described current
SOC value SOCn+1With the standard SOC value SOCMarkIt compares, if the difference of the two is greater than 5% (such as SOCn+1It is 61%,
SOCMarkIt is 64.5%, the difference of the two is 5.4%), then to need at this time to the current SOC value SOC at this timen+1It is modified.Tool
Body, when being modified, it is modified according to following formula:
SOCIt repairs=(SOCn+1-SOCn)*0.1+SOCn
Wherein as described above, SOCnValue be 65%, SOCn+1Value be 61%, SOCMarkIt is 64.5%, by relevant parameter generation
Enter above-mentioned formula and obtains SOCIt repairsThe SOC value that=(0.61-0.65) * 0.1+0.65=0.646 namely the battery are shown at this time
SOCIt repairsIt is 64.6%, passes through revised SOC at this timeIt repairsValue 64.6% and standard SOCnValue 65% it is very close, and lead to
It crosses and calculates obtained SOCn+1Estimated value be 61%, the SOC value SOC of the estimated value and standardIt repairsDiffer larger, by amendment
The precision of the value of the current SOC significantly improves afterwards.
Referring to Fig. 2, the method for the SOC for one of second embodiment based on OCV curve amendment, specifically, first
The automobile batteries is first opened, last time remaining SOC is read from the battery management system BMS being arranged in the automobile batteries
Value SOCn, wherein n is the integer more than or equal to 1.Specifically, battery described in such as last time is in close state, then single-chip microcontroller
In EEPROM record be also the battery carves when closed a remaining SOC value SOCn, such as the residual being recorded
SOC value SOCnIt is 70%.
The battery last time remaining SOC value SOC is obtained in recordnLater, it is then calculated by ampere-hour method
The current SOC value SOC of the batteryn+1.It should be noted that in the present embodiment, n and n+1 only refer only to adjacent two
The secondary residual SOC value SOC for obtaining the battery respectivelynAnd current SOC value SOC is calculated using ampere-hour methodn+1。
Specifically, carrying out calculating the current SOC value SOC using ampere-hour methodn+1When, if from last registration to this
If what the battery carried out in the period calculated is electric discharge operation, then corresponding discharge current value I and time are utilized
Interval t is integrated to obtain corresponding electric quantity change value, then by electric quantity change value divided by the specified electric quantity value of the battery
To obtain SOC changing value Δ SOC, then in original residual SOC value SOCnBasis subtract Δ SOC the current of the battery can be obtained
SOC value SOCn+1.Such as obtained SOC is calculated at this timen+1Value is 66%.(likewise, if from last registration to this progress
If what the battery carried out in the period of calculating is charging operation, then corresponding charging current value I and time interval t is utilized
Integrated to obtain corresponding electric quantity change value, then by electric quantity change value divided by the specified electric quantity value of the battery to obtain
SOC changing value Δ SOC, then SOC value SOC is remained in originalnBasis the battery can be obtained plus SOC variation delta SOC
Current SOC value SOCn+1)。
The current SOC value SOC of the battery is being calculatedn+1Later (in this respect it is to be noted that calculating institute at this time
Obtained current SOC value is that there are still certain difference, this hairs for SOC value corresponding in an estimated value, with standard OCV curve
It is bright to calculate obtained current SOC value SOC to improven+1Accuracy, it is special by current SOC value SOCn+1With standard OCV curve
In corresponding SOCMarkIt is modified as standard), then judge the current SOC value SOC of the batteryn+1Value whether
Between 20%-80%.As described above, calculating the current SOC value SOC of the resulting batteryn+1It is 66%.
In the current SOC value SOC that the battery has been calculatedn+1Value after, then obtain the current of the battery
Actual voltage value U and current actual temperature value.Since automobile batteries includes multiple single batteries, and each single battery divides
It is not corresponding with a cell voltage value.Specifically, to obtain the currently practical voltage value U of the battery, it is necessary first to which confirmation is in institute
State minimum cell voltage value U corresponding to that minimum battery of voltage in multiple single batteries0And corresponding internal resistance value r,
In addition to this, if the battery is in charged state, charging current I corresponding to the battery is obtained；If at the battery
In discharge condition, then discharge current I corresponding to the battery is obtained.Then according to formula U=U0- I*r finally to confirm institute
State the size of the currently practical voltage value U of battery.At the same time, for the current actual temperature value T, the current reality
Border temperature value T is detected by the temperature detecting element being arranged in battery management system BMS.
After it confirmed the currently practical voltage value U and current actual temperature value T, since the automobile batteries exists
The OCV diagram database of a standard is corresponding with when factory, according to the currently practical voltage value U of above-mentioned acquisition and currently practical temperature
Angle value T searches corresponding standard SOC value SOC in standard OCV curveMarkSo as to the resulting current SOC value SOC of above-mentioned calculatingn+1
It is compared.As the standard SOC value SOCMarkWith the current SOC value SOCn+1Between difference be greater than 5% when, then according to public affairs
Formula SOCIt repairs=(SOCn+1-SOCn)*0.1+SOCnTo the current SOC value SOCn+1It is modified processing.For example, being worked as according to described
The preceding actual voltage value U and current actual temperature value T searches to obtain corresponding standard SOC value SOCMarkIt is 69.5%, due to
The current SOC value SOCn+1With the standard SOC value SOCMarkBetween difference be greater than 5%, then need at this time to described current
SOC value SOCn+1It is modified.Specifically, being modified when being modified according to following formula:
SOCIt repairs=(SOCn+1-SOCn)*0.1+SOCn
Wherein as described above, SOCnValue be 70%, SOCn+1Value be 66%, SOCMarkIt is 69.5%, by relevant parameter generation
Enter above-mentioned formula and obtains SOCIt repairsThe SOC value that=(0.66-0.70) * 0.1+0.70=0.696 namely the battery are shown at this time
SOCIt repairsIt is 69.6%, passes through revised SOC at this timeIt repairsValue 69.6% and standard SOCnValue 70% it is very close, and lead to
It crosses and calculates obtained SOCn+1Estimated value be 66%, the SOC value SOC of the estimated value and standardIt repairsDiffer larger, by amendment
The precision of the value of the current SOC significantly improves afterwards.
Referring to Fig. 3, for a kind of system based on OCV curve amendment SOC that third embodiment of the invention proposes, application
In batteries of electric automobile, wherein the system comprises sequentially connected COMPREHENSIVE CALCULATING module, actual queries module, data judgements
Module and value revision module.
Wherein, the COMPREHENSIVE CALCULATING module is used to obtain the residual SOC value for the automobile batteries that n-th measures, and root
According to it is described residual SOC value calculate (n+1)th time the automobile batteries current SOC value, wherein the n-th measure it is described residual
Staying SOC value is SOCn, the described (n+1)th time current SOC value being calculated is SOCn+1.The actual queries module is used for
The described (n+1)th time currently practical voltage value and current actual temperature value for obtaining the automobile batteries, according to described current
Actual voltage value and the current actual temperature value are inquired in standard OCV diagram database to obtain the automobile electricity
Standard SOC value corresponding to pond, the standard SOC value are denoted as SOCMark.If the value revision module is used for the SOCn+1With institute
State SOCMarkBetween difference be greater than 5% when, then according to formula S OCIt repairs=(SOCn+1-SOCn)*0.1+SOCnTo the current SOC
Value SOCn+1It is modified.
Specifically, the COMPREHENSIVE CALCULATING module includes sequentially connected first acquisition for the COMPREHENSIVE CALCULATING module
Unit, second acquisition unit and SOC computing unit, wherein the first acquisition unit is for obtaining what the n-th measured
The residual SOC value SOC of the automobile batteriesn；The second acquisition unit is used to obtain the described (n+1)th time automobile
The charge and discharge flow valuve I of battery and time interval t when being measured apart from the n-th；The SOC computing unit is used for according to institute
State residual SOC value SOCn, the charge and discharge flow valuve I and the time interval t described (n+1)th time automobile is calculated
The current SOC value SOC of batteryn+1。
In addition, the data judgment module is for judging the described (n+1)th time current SOC value SOC being calculatedn+1
Whether greater than 20% and less than 80%, if so, the actual queries module obtains described (n+1)th time of the automobile batteries
Currently practical voltage value and current actual temperature value, and according to the currently practical voltage value and the current actual temperature
Value is inquired in the standard OCV diagram database to obtain standard SOC value SOC corresponding to the automobile batteriesMark。
For the SOC computing unit, the SOC computing unit includes electric quantity integration unit and base interconnected
This arithmetic element, wherein the electric quantity integration unit is for integrating the charge and discharge flow valuve I and the time interval t
To obtain electric quantity change value, the basic processing unit is used for the electric quantity change value divided by the specified electricity of the automobile batteries
Amount is to obtain SOC changing value Δ SOC, and by the SOC changing value Δ SOC and the residual SOC value SOCnMake and/difference is to obtain
The current SOC value SOCn+1。
At the same time, for the automobile batteries, the automobile batteries includes multiple single batteries, each monomer
Battery respectively corresponds a cell voltage value.The actual queries module includes single battery detection unit interconnected and electricity
Confirmation unit is pressed, wherein the single battery detection unit is minimum for obtaining a voltage value in the multiple single battery
Minimum cell voltage value U corresponding to single battery0, internal resistance value r and the charge and discharge flow valuve I, the voltage confirmation unit
For according to formula U=U0- I*r is to obtain the currently practical voltage value U of the automobile batteries, the actual queries module
The temperature range of the acquired current actual temperature value T is 0 DEG C~60 DEG C.
A kind of method and system based on OCV curve amendment SOC proposed by the present invention, in practical applications can be to battery
SOC value corrected effectively in real time so that the SOC value of battery is more nearly in standard OCV curve corresponding standard
SOC value improves the overall precision of SOC estimated value, meets practical application request.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of method based on OCV curve amendment SOC is applied to batteries of electric automobile, which is characterized in that including walking as follows
It is rapid:
The residual SOC value for the automobile batteries that n-th measures is obtained, and calculates (n+1)th institute according to the residual SOC value
The current SOC value of automobile batteries is stated, the residual SOC value that wherein n-th measures is SOCn, (n+1)th institute being calculated
Stating current SOC value is SOCn+1, n≤1；
The (n+1)th currently practical voltage value and current actual temperature value for obtaining the automobile batteries, according to described current
Actual voltage value and the current actual temperature value are inquired in standard OCV diagram database to obtain corresponding standard
SOC value, the standard SOC value are denoted as SOCMark；
If the SOCn+1With the SOCMarkBetween difference be greater than 5% when, then according to formula S OCIt repairs=(SOCn+1-SOCn)*0.1+
SOCnTo the SOCn+1It is modified.
2. the method according to claim 1 based on OCV curve amendment SOC, which is characterized in that the acquisition n-th is surveyed
The residual SOC value of the automobile batteries taken, and working as (n+1)th automobile batteries, is calculated according to the residual SOC value
The step of preceding SOC value includes:
Obtain the residual SOC value SOC for the automobile batteries that n-th measuresn；
Time interval t when obtaining the charge and discharge flow valuve I of (n+1)th automobile batteries and being measured apart from n-th；
According to the residual SOC value SOCn, the charge and discharge flow valuve I and the time interval t (n+1)th institute is calculated
State the current SOC value SOC of automobile batteriesn+1。
3. the method according to claim 2 based on OCV curve amendment SOC, which is characterized in that described according to the residual
SOC value SOCn, the charge and discharge flow valuve I and the time interval t be calculated (n+1)th time the automobile batteries it is described
Current SOC value SOCn+1The step of include:
The charge and discharge flow valuve I and the time interval t are integrated to obtain electric quantity change value；
The electric quantity change value is obtained into SOC changing value Δ SOC divided by the specified electric quantity of the automobile batteries, and will be described
The SOC changing value Δ SOC and residual SOC value SOCnMake and/difference is to obtain the current SOC value SOCn+1。
4. the method according to claim 1 based on OCV curve amendment SOC, which is characterized in that obtaining the automobile electricity
(n+1)th currently practical voltage value and current actual temperature value in pond, according to the currently practical voltage value and described
Current actual temperature value is inquired in standard OCV diagram database to obtain standard SOC corresponding to the automobile batteries
In the step of value, which comprises
Judge (n+1)th current SOC value SOC being calculatedn+1Whether 20% is greater than and less than 80%；
If so, the (n+1)th currently practical voltage value and current actual temperature value of the automobile batteries are obtained, and according to
The currently practical voltage value and the current actual temperature value are inquired in the standard OCV diagram database to obtain
To standard SOC value SOC corresponding to the automobile batteriesMark。
5. the method according to claim 2 based on OCV curve amendment SOC, which is characterized in that the automobile batteries includes
Multiple single batteries, each single battery respectively corresponds a cell voltage value, described to obtain the (n+1)th of the automobile batteries
The step of secondary currently practical voltage value includes:
Minimum cell voltage value U corresponding to the minimum single battery of a voltage value is obtained in the multiple single battery0, it is interior
The resistance value r and charge and discharge flow valuve I；
According to formula U=U0- I*r is to obtain the currently practical voltage value of the automobile batteries.
6. a kind of system based on OCV curve amendment SOC is applied to batteries of electric automobile characterized by comprising
COMPREHENSIVE CALCULATING module, for obtaining the residual SOC value for the automobile batteries that n-th measures, and according to the residual SOC
Value calculates the current SOC value of (n+1)th automobile batteries, and the residual SOC value that wherein n-th measures is SOCn, n-th
+ 1 current SOC value being calculated is SOCn+1, n≤1；
Actual queries module, for obtain the automobile batteries (n+1)th currently practical voltage value and currently practical temperature
Angle value is looked into standard OCV diagram database according to the currently practical voltage value and the current actual temperature value
It askes to obtain standard SOC value corresponding to the automobile batteries, the standard SOC value is denoted as SOCMark；
Value revision module, if being used for the SOCn+1With the SOCMarkBetween difference be greater than 5% when, then according to formula S OCIt repairs
=(SOCn+1-SOCn)*0.1+SOCnTo the SOCn+1It is modified.
7. the system according to claim 6 based on OCV curve amendment SOC, which is characterized in that the COMPREHENSIVE CALCULATING module
Include:
First acquisition unit, for obtaining the residual SOC value SOC for the automobile batteries that n-th measuresn；
Second acquisition unit, for obtaining the charge and discharge flow valuve I of (n+1)th automobile batteries and apart from the n-th
Time interval t when measuring；
SOC computing unit, for according to the residual SOC value SOCn, the charge and discharge flow valuve I and the time interval t calculate
Obtain the current SOC value SOC of (n+1)th automobile batteriesn+1。
8. the system according to claim 7 based on OCV curve amendment SOC, which is characterized in that the SOC computing unit
Include:
Electric quantity integration unit, for being integrated the charge and discharge flow valuve I and the time interval t to obtain electric quantity change
Value；
Basic processing unit, for the electric quantity change value to be obtained SOC variation divided by the specified electric quantity of the automobile batteries
It is worth Δ SOC, and by the SOC changing value Δ SOC and the residual SOC value SOCnMake and/difference is to obtain the current SOC value
SOCn+1。
9. the system according to claim 6 based on OCV curve amendment SOC, which is characterized in that the system also includes:
Data judgment module, for judging (n+1)th current SOC value SOC being calculatedn+1It is whether greater than 20% and small
In 80%；
The actual queries module is also used to as (n+1)th current SOC value SOC being calculatedn+1Greater than 20% and it is less than
When 80%, then the (n+1)th currently practical voltage value and current actual temperature value of the automobile batteries are obtained, and according to institute
It states currently practical voltage value and the current actual temperature value is inquired in the standard OCV diagram database to obtain
Standard SOC value SOC corresponding to the automobile batteriesMark。
10. the system according to claim 7 based on OCV curve amendment SOC, which is characterized in that the automobile batteries packet
Multiple single batteries are included, each single battery respectively corresponds a cell voltage value, and the actual queries module includes:
Single battery detection unit, for being obtained in the multiple single battery corresponding to the minimum single battery of a voltage value
Minimum cell voltage value U0, internal resistance value r and the charge and discharge flow valuve I；
Voltage confirmation unit, for according to formula U=U0- I*r is to obtain the currently practical voltage value of the automobile batteries.
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| CN107571747B (en) * | 2017-07-07 | 2020-06-16 | 北汽福田汽车股份有限公司 | Smooth control method and device of SOC (System on chip), battery management system and vehicle |
| CN107959070B (en) * | 2017-10-30 | 2019-11-05 | 安徽江淮汽车集团股份有限公司 | A kind of SOC modification method and battery management system |
| KR102244140B1 (en) | 2017-12-21 | 2021-04-22 | 주식회사 엘지화학 | Method and apparatus for calibrating state of charge of a battery |
| CN108232342B (en) * | 2018-01-03 | 2020-02-14 | 中车株洲电力机车有限公司 | Storage battery management method and system and storage battery management equipment |
| CN108227817B (en) * | 2018-01-23 | 2020-11-10 | 北京新能源汽车股份有限公司 | Power battery power state control method, device and equipment |
| CN109507590B (en) * | 2018-11-20 | 2021-06-11 | 惠州拓邦电气技术有限公司 | Multi-interference-removal grid intelligent tracking SOC correction method and system |
| CN111220919B (en) * | 2018-11-26 | 2021-04-20 | 北汽福田汽车股份有限公司 | Battery electric quantity detection method and device and vehicle |
| CN113009346B (en) * | 2021-03-01 | 2023-01-03 | 惠州市德赛电池有限公司 | Battery system and SOC value correction method thereof |
| CN114325413B (en) * | 2021-12-28 | 2023-06-30 | 湖北亿纬动力有限公司 | Power battery SOC correction method, device, equipment and storage medium |
| CN114636936B (en) * | 2022-03-16 | 2024-06-28 | 长兴太湖能谷科技有限公司 | Correction method and device for SOC prediction curve in charging stage of lead-acid battery |
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