CN109307844A - A kind of evaluation method and device of lithium battery SOC - Google Patents
A kind of evaluation method and device of lithium battery SOC Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The present patent application discloses the evaluation method and device of a kind of lithium battery SOC, is related to field of battery management, to solve the problems, such as that electrodynamic balance vehicle SOC under routinely use and charging and discharging state estimates inaccuracy.This method specifically includes that the charge and discharge process founding mathematical models according to lithium battery, calculates the SOC-OCV curve of lithium battery；Calculate initial SOC parameter；Obtain the charging and discharging currents of lithium battery；Judge the operating status of lithium battery；Current voltage is recorded, and searches the corresponding delay time of operating status；Record the update voltage after delay time；It calculates current voltage and updates the voltage difference of voltage；Calculate the amplitude of variation of initial SOC parameter with update voltage corresponding update SOC parameter in SOC-OCV curve；If meeting correction conditions, amendment SOC parameter is calculated；Initial SOC parameter is added with amendment SOC parameter, generates estimation SOC parameter.The application is mainly used in the battery management system of electrodynamic balance vehicle.
Description
Technical field
This application involves field of battery management more particularly to a kind of evaluation methods and device of lithium battery SOC.
Background technique
More and more electrodynamic balance vehicles are popularized in popular life and are used at present, also increasingly with its application range
Extensively, also higher and higher to the requirement of its cruising ability.In order to guarantee the cruising ability of electrodynamic balance vehicle, it is necessary to guarantee cell tube
The reliability of reason system (Battery Management System, BMS), and state-of-charge (State Of Charge, SOC)
Effective support can be provided for the estimation of BMS course continuation mileage, extension battery life, raising battery utilization rate etc..Due to lithium battery
Self-characteristic, during electrodynamic balance vehicle is radical or emergency brake, load value constantly changes, and guiding discharge electric current also constantly becomes
Change, and can not determine battery model to the corresponding boundary of discharge curve under each state, so that SOC cannot be accurately estimated, therefore nothing
Method predicts the health status of lithium battery itself, prevent battery considerably increases the probability of cell damage from being effectively protected.
In the prior art, what is be commonly used is open circuit voltage method, ampere integration method and Kalman filtering algorithm.Open-circuit voltage
Method is according to battery under conditions of long-time is stood, and end voltage and SOC have relatively-stationary functional relation, so according to open circuit
Voltage is higher come the accuracy for estimating SOC, but the time stood is needed to need to grow very much, can not adapt in actual use, constantly
The case where variation, because the accuracy of a little SOC it is relatively low under.For Amperometric in the case where original state is out of the picture, BMS is to be difficult accurately
Estimate the use state and SOC value of battery, and in the case where time-dependent current or operating current drastic change, current method adaptability
It is poor.Therefore, how electrodynamic balance vehicle accurately estimates that SOC is a kind of urgent problem to be solved in actual use.
Summary of the invention
This application provides the evaluation methods and device of a kind of lithium battery SOC, to solve electrodynamic balance vehicle in conventional use
And the inaccurate problem of SOC estimation under charging and discharging state.
In a first aspect, this application provides the evaluation methods of lithium battery SOC a kind of, this method comprises: according to lithium battery
Charge and discharge process founding mathematical models calculate the SOC-OCV curve of the lithium battery；If the current voltage of the lithium battery is small
In preset minimum voltage, then 0 is set by the initial SOC parameter；If the current voltage is not less than preset minimum voltage,
The initial SOC parameter is then calculated according to the SOC-OCV curve；Obtain the charging and discharging currents of the lithium battery；According to described
The comparison result of charging and discharging currents and preset running current judges that the operating status of the lithium battery, the operating status include
Static condition, charged state and discharge condition；When recording the current voltage, and searching the corresponding delay of the operating status
Between；Record the update voltage after the delay time；Calculate the current voltage and the voltage difference for updating voltage；Meter
Calculate the variation width of the initial SOC parameter with the update voltage corresponding update SOC parameter in the SOC-OCV curve
Degree；If the operating status is static condition, when the voltage difference is greater than preset voltage difference, amendment SOC parameter is calculated,
The amendment SOC parameter is the initial SOC parameter and the difference for updating SOC parameter, with the first preset proportion coefficient
Product；If the operating status is charged state, when the voltage difference is greater than the preset voltage difference and the variation width
Degree be greater than the first predetermined magnitude when, calculate amendment SOC parameter, the amendment SOC parameter be the initial SOC parameter with it is described more
The difference of new SOC parameter, the product with the first preset proportion coefficient；If the operating status is discharge condition, when described
Voltage difference is poor greater than the preset voltage, described update voltage is less than preset voltage critical value and the amplitude of variation is greater than first
When predetermined magnitude, alternatively, the preset voltage is poor, the update voltage is critical not less than preset voltage when the voltage difference is greater than
Value and the amplitude of variation be greater than the second predetermined magnitude when, calculate amendment SOC parameter, the amendment SOC parameter be it is described initially
SOC parameter and the difference for updating SOC parameter, the product with the first preset proportion coefficient；By the initial SOC parameter and institute
It states amendment SOC parameter to be added, generates estimation SOC parameter.
With reference to first aspect, in a first possible implementation of that first aspect, the charge and discharge according to lithium battery
Process founding mathematical models, before the SOC-OCV curve for calculating the lithium battery, the method also includes: in the lithium battery
When powering on, according to lithium battery parameter setting full capacity value；After the generation estimation SOC parameter, the method also includes: it updates
The full capacity value of the lithium battery；Recalculate the SOC-OCV curve of the lithium battery.
With reference to first aspect, in the second possible implementation of the first aspect, the full appearance for updating lithium battery
Magnitude, comprising: if the operating status of the lithium battery is discharge condition, calculate the first estimation SOC ginseng of the lithium battery
Number；At the end of lithium battery electric discharge, the second estimation SOC parameter of the lithium battery is calculated；Calculate the first estimation SOC
The capacity difference of parameter and the second estimation SOC parameter；If the capacity difference is greater than the full capacity value of the second preset proportion,
According to the capacity difference and the second estimation SOC parameter, the full capacity value is recalculated.
With reference to first aspect, in a third possible implementation of the first aspect, described to calculate the lithium battery
First estimation SOC parameter, comprising: the first estimation SOC parameter of the lithium battery is calculated according to ampere integration method；The calculating institute
State the second estimation SOC parameter of lithium battery, comprising: the second estimation SOC parameter of the lithium battery is calculated according to ampere integration method.
With reference to first aspect, in a fourth possible implementation of the first aspect, described to calculate the lithium battery
After second estimation SOC parameter, the method also includes: if the second estimation SOC parameter is less than the preset minimum electricity
The second estimation SOC parameter is then reset to 0 value by pressure；If the second estimation SOC parameter is not less than described preset minimum
Voltage, then using the ratio of the second estimation SOC parameter and the first estimation SOC parameter as variation ratio, described in resetting
Second estimation SOC parameter.
Second aspect, present invention also provides the estimation device of lithium battery SOC a kind of, described device includes for executing the
On the one hand in various implementations method and step module.
The third aspect, present invention also provides a kind of terminals, comprising: processor and memory；The processor can be held
The program or instruction stored in the row memory, to realize with lithium battery SOC described in the various implementations of first aspect
Evaluation method.
Fourth aspect, present invention also provides a kind of storage medium, which can be stored with program, the journey
Sequence some or all of can realize in each embodiment of evaluation method including lithium battery SOC provided by the present application step when executing.
The evaluation method and device of a kind of lithium battery SOC provided by the present application, it is bent by the SOC-OCV for calculating lithium battery
Line calculates or is arranged initial SOC parameter then according to the comparison result of current voltage and preset minimum voltage, then obtain lithium
The charging and discharging currents of battery judge the operation of lithium battery then according to the comparison result of charging and discharging currents and preset running current
Then state records current voltage and searches the corresponding delay time of operating status, re-records the update after delay time
Then voltage is calculating current voltage and is updating the voltage difference of voltage, then calculate initial SOC parameter and update voltage in SOC-
The corresponding amplitude of variation for updating SOC parameter in OCV curve calculates amendment SOC parameter further according to operating status, finally will output
SOC parameter is added with amendment SOC parameter, generates estimation SOC parameter.When calculating amendment SOC parameter, compared with prior art,
The application can use different methods to judge according to the different conditions of lithium battery with open-circuit voltage values as according to the SOC of calculating
Whether parameter, which needs, compensates, and SOC parameter will be then corrected if necessary to compensation and is set as initial SOC parameter and updates SOC parameter
Difference, the product with certain proportionality coefficient, is modified compensation on the basis of initial SOC parameter to correct SOC parameter, with
Improve the accuracy of estimation SOC parameter.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of evaluation method flow chart of lithium battery SOC provided by the present application；
Fig. 2 is the evaluation method flow chart of another lithium battery SOC provided by the present application；
Fig. 3 is a kind of estimation device composition block diagram of lithium battery SOC provided by the present application；
Fig. 4 is the estimation device composition block diagram of another lithium battery SOC provided by the present application；
Fig. 5 is a kind of composition block diagram of full capacity value updating unit provided by the present application.
Specific embodiment
The power of electrodynamic balance vehicle has lithium battery offer, by setting BMS system to guarantee the continuous of electrodynamic balance vehicle
Boat ability, and SOC can for the estimation of BMS course continuation mileage, extend battery life, battery utilization rate be provided etc. effective branch is provided
It holds, so this application provides the evaluation methods and device of a kind of lithium battery SOC.It is a kind of lithium provided by the present application referring to Fig. 1
The evaluation method flow chart of battery SOC.This method is to absorb existing various methods (including open circuit voltage method, ampere integration method, card
Kalman Filtering method) various advantages, optimize when battery is under different conditions in different ways, create backoff algorithm to SOC
Precision improved, under different bad borders in balance car actual use because load it is different due to the discharge current difference that generates into
Row Optimization Compensation, to ensure the accuracy of SOC value.As shown in Figure 1, this method comprises:
101, according to the charge and discharge process founding mathematical models of lithium battery, the SOC-OCV curve of the lithium battery is calculated.
Lithium battery is subjected to sufficient charge-discharge test, experimental data is recorded, charge and discharge process is established according to experimental data
Data model.According to mathematical model, SOC-OCV curve is calculated.Open-circuit voltage refers to end electricity of the battery under open-circuit condition
Pressure.The open-circuit voltage of battery is equal to battery anode electrode potential of battery and negative (when no electric current passes through the two poles of the earth) in open circuit
The difference of the electrode potential of pole.SOC-OCV curve is calculated and records, so as to subsequent comparison of tabling look-up.The representation of SOC-OCV curve
It can be relational expression, the table of comparisons or figure, in the embodiment of the present application without limitation to the representation of SOC-OCV.
If 102, the current voltage of the lithium battery is less than preset minimum voltage, the initial SOC parameter is arranged
It is 0.
Preset minimum voltage is arranged to protect lithium battery in the over-discharge phenomenon of lithium battery in order to prevent.If lithium battery is worked as
Preceding voltage is less than preset minimum voltage, 0 is set by initial SOC parameter, wherein preset minimum voltage can be set to 2V.
If 103, the current voltage is not less than preset minimum voltage, according to SOC-OCV curve calculating
Initial SOC parameter.
According to the current voltage of lithium battery, initial SOC parameter can be calculated in real time.After calculating initial SOC parameter, judgement
Whether the initial SOC parameter needs to correct, and if necessary to correct, then revised estimation SOC parameter is calculated, if you do not need to repairing
Just, then directly according to SOC-OCV curve estimation SOC parameter.
104, the charging and discharging currents of the lithium battery are obtained.
105, according to the comparison result of the charging and discharging currents and preset running current, judge the operation shape of the lithium battery
State, the operating status include static condition, charged state and discharge condition.
If charging and discharging currents are less than preset running current, lithium battery is in static condition；If charging and discharging currents are not
Less than preset running current, then lithium battery is in charge or discharge state.Further according to charging and discharging currents direction, judge at lithium battery
In charged state or discharge condition.Preset running current can be set to 1A.In order to guarantee the normal operation of electrodynamic balance vehicle,
The peak of charging and discharging currents, such as 8A can also be set, when charging and discharging currents exceed, can produce warning message.Judgement
When the operating status of lithium battery, it is also necessary to environment temperature locating for lithium battery is considered, if ambient temperature value is in 10 DEG C or more
When, meet the condition of lithium battery operating temperature, the operating status of lithium battery can be judged according to charging and discharging currents.
106, the current voltage is recorded, and searches the corresponding delay time of the operating status.
Different operating statuses, the amplitude of variation of lithium battery SOC within the unit time is different, so delay time also not phase
Together.Such as operating status is static condition, delay time is chosen for 10 minutes, and operating status is charged state or electric discharge shape
State, delay time are chosen for 10 seconds.
107, update voltage of the record after the delay time.
108, the current voltage and the voltage difference for updating voltage are calculated.
Voltage difference refers to current voltage and updates difference of the voltage under same voltage unit.
109, calculate the initial SOC parameter with the update voltage the corresponding update SOC in the SOC-OCV curve
The amplitude of variation of parameter.
Amplitude of variation refers to initial SOC parameter and updates the difference of SOC parameter and the ratio of initial SOC parameter, the ratio
It can be indicated with percentage.
If 110, the operating status is static condition, when the voltage difference is greater than preset voltage difference, calculating is repaired
Positive SOC parameter.
When operating status is static condition, as long as voltage difference is poor greater than preset voltage, it is judged as needing initial SOC parameter
It needs to correct.Preset voltage difference can choose 150mV.If necessary to correct initial SOC parameter, then amendment SOC parameter is calculated, specifically
Calculation method include: the difference for calculating initial SOC parameter and updating SOC parameter, by the difference multiplied by preset proportion coefficient, etc.
To result be determined as correct SOC parameter.
If 111, the operating status is charged state, when the voltage difference is poor and described greater than the preset voltage
When amplitude of variation is greater than the first predetermined magnitude, amendment SOC parameter is calculated.
When operating status is charged state, needs to meet simultaneously voltage difference and be greater than greater than preset voltage difference and amplitude of variation
First condition of predetermined magnitude two, initial SOC parameter just need to correct.Preset voltage difference can choose 150mV.In the charge state
The calculation method for correcting SOC parameter is identical as the amendment calculation method of SOC parameter under static condition, and the amendment SOC parameter is
The initial SOC parameter and the difference for updating SOC parameter, the product with the first preset proportion coefficient.
If 112, the operating status is discharge condition, when the voltage difference is poor, described greater than the preset voltage
Voltage is updated less than preset voltage critical value and when the amplitude of variation is greater than the first predetermined magnitude, alternatively, working as the voltage difference
Poor greater than the preset voltage, the described update voltage is not less than preset voltage critical value and the amplitude of variation is preset greater than second
When amplitude, amendment SOC parameter is calculated.
Operating status be charged state when, need to meet simultaneously voltage difference greater than preset voltage it is poor, update voltage be less than
Preset voltage critical value and amplitude of variation are greater than three conditions of the first predetermined magnitude, or meet voltage difference simultaneously greater than preset electricity
Pressure difference updates voltage not less than preset voltage critical value and amplitude of variation greater than three conditions of the second predetermined magnitude, initial SOC ginseng
Number just needs to correct.Wherein preset critical voltage value is 3.2V, and the first predetermined magnitude is 5%, and the second predetermined magnitude is 15%.In advance
150mV can be chosen by setting voltage difference.SOC ginseng is corrected under the calculation method of amendment SOC parameter and static condition under the electricity condition that discharges
Several calculation methods is identical, and the amendment SOC parameter is the initial SOC parameter and the difference for updating SOC parameter, with the
The product of one preset proportion coefficient.
113, the initial SOC parameter is added with the amendment SOC parameter, generates estimation SOC parameter.
The default value for correcting SOC parameter is 0, if the initial SOC parameter of lithium battery is unsatisfactory for correction conditions, is corrected
SOC parameter is determined as default value.Initial SOC parameter is added with amendment SOC parameter, generates estimation SOC parameter.
The evaluation method of lithium battery SOC provided by the present application a kind of, by calculating the SOC-OCV curve of lithium battery, then
It according to the comparison result of current voltage and preset minimum voltage, calculates or initial SOC parameter is set, then obtain filling for lithium battery
Discharge current judges the operating status of lithium battery, then then according to the comparison result of charging and discharging currents and preset running current
Record current voltage simultaneously searches the corresponding delay time of operating status, re-records the update voltage after delay time, then
It is calculating current voltage and is updating the voltage difference of voltage, then calculate initial SOC parameter and updating voltage in SOC-OCV curve
It is corresponding update SOC parameter amplitude of variation, further according to operating status calculate amendment SOC parameter, finally will output SOC parameter and
It corrects SOC parameter to be added, generates estimation SOC parameter.When SOC parameter is repaired in calculating, compared with prior art, the application being capable of root
According to the different conditions of lithium battery, different methods is used to judge open-circuit voltage values whether to need to mend according to the SOC parameter of calculating
It repays, SOC parameter will be then corrected if necessary to compensation and is set as initial SOC parameter and updates the difference of SOC parameter, and certain ratio
The product of example coefficient, is modified compensation on the basis of initial SOC parameter to correct SOC parameter, to improve estimation SOC parameter
Accuracy.
It referring to fig. 2, is the evaluation method flow chart of another lithium battery SOC provided by the present application, method shown in Fig. 1
On the basis of, the charge and discharge process founding mathematical models according to lithium battery, calculate the lithium battery SOC-OCV curve it
Before, further includes:
201, when the lithium battery powers on, according to lithium battery parameter setting full capacity value.
Full capacity value is the endpoint value of SOC-OCV curve, is the necessary point for constituting the curve.The lithium battery of electrodynamic balance vehicle
Usually with preset parameter, such as battery pack number, the capacity of each battery pack, operating ambient temperature and operating current etc.
Deng.According to lithium battery parameter setting full capacity value, but due to battery management system, the basis consumption of electrodynamic balance vehicle and lithium
The full capacity value of the volume change of battery in use, setting is inaccurate.
Therefore, after the generation estimation SOC parameter, further includes:
202, the full capacity value of the lithium battery is updated；
Its update method, specifically includes: if the operating status of the lithium battery is discharge condition, calculating the lithium electricity
The first estimation SOC parameter in pond；At the end of lithium battery electric discharge, the second estimation SOC parameter of the lithium battery is calculated；Meter
Calculate the capacity difference of the first estimation SOC parameter with the second estimation SOC parameter；If the capacity difference is greater than the second preset proportion
The full capacity value, then according to the capacity difference and second estimation SOC parameter, recalculate the full capacity value.Again it counts
Calculate full capacity value, comprising: calculating full capacity is poor, and full capacity difference refers to the difference of the capacity before electric discharge and the capacity after electric discharge, with
The sum of volume change amount and the capacity difference of original SOC under under-voltage state；Full capacity value is calculated again, and full capacity value is that former full capacity is poor
The quotient of value and capacity difference.Lithium battery is discharged during, during discharge under any time calculate lithium battery
First estimation SOC, that is, the estimation SOC parameter that the operating status of lithium battery is for discharge condition.Electric discharge terminates with voltage
Size is mark, calculates the second estimation SOC parameter at the end of electric discharge.Second preset proportion can be chosen for one third, when
When the capacity difference of first estimation SOC parameter and the second estimation SOC parameter is greater than one third, full capacity value is recalculated.
The first estimation SOC parameter for calculating the lithium battery, comprising: the lithium battery is calculated according to ampere integration method
First estimation SOC parameter；The second estimation SOC parameter for calculating the lithium battery, comprising: calculated according to ampere integration method
Second estimation SOC parameter of the lithium battery.After the second estimation SOC parameter for calculating the lithium battery, the method
If further include: the second estimation SOC parameter is less than the preset minimum voltage, by the second estimation SOC parameter weight
It is set to 0 value；If the second estimation SOC parameter is not less than the preset minimum voltage, with the second estimation SOC parameter
Ratio with the first estimation SOC parameter resets the second estimation SOC parameter as variation ratio.
203, the SOC-OCV curve of the lithium battery is recalculated.
According to full capacity value, SOC-OCV curve end point value is reset, SOC-OCV curve is recalculated.In subsequent use
When SOC-OCV curve, using the SOC-OCV curve recalculated.
The evaluation method of lithium battery SOC provided by the present application a kind of, by calculating the SOC-OCV curve of lithium battery, then
It according to the comparison result of current voltage and preset minimum voltage, calculates or initial SOC parameter is set, then obtain filling for lithium battery
Discharge current judges the operating status of lithium battery, then then according to the comparison result of charging and discharging currents and preset running current
Record current voltage and search operating status for delay time, re-record the update voltage after delay time, then
It is calculating current voltage and is updating the voltage difference of voltage, then calculate initial SOC parameter and updating voltage in SOC-OCV curve
It is corresponding update SOC parameter amplitude of variation, further according to operating status calculate amendment SOC parameter, finally will output SOC parameter and
It corrects SOC parameter to be added, generates estimation SOC parameter.When SOC parameter is repaired in calculating, compared with prior art, the application being capable of root
According to the different conditions of lithium battery, different methods is used to judge open-circuit voltage values whether to need to mend according to the SOC parameter of calculating
It repays, SOC parameter will be then corrected if necessary to compensation and is set as initial SOC parameter and updates the difference of SOC parameter, and certain ratio
The product of example coefficient, is modified compensation on the basis of initial SOC parameter to correct SOC parameter, to improve estimation SOC parameter
Accuracy.
Referring to Fig. 3, it is a kind of estimation device composition block diagram of lithium battery SOC provided by the present application, is referring to fig. 4 the application
The estimation device composition block diagram of another lithium battery SOC of offer, referring to Fig. 5, more for a kind of full capacity value provided by the present application
The composition block diagram of new unit.As the specific implementation of method shown in Fig. 1 and Fig. 2, as shown in figure 3, the device includes:
SOC-OCV curve computation unit 301 calculates institute for the charge and discharge process founding mathematical models according to lithium battery
State the SOC-OCV curve of lithium battery；
Initial SOC parameter setting unit 302, if the current voltage for the lithium battery is less than preset minimum voltage,
Then 0 is set by the initial SOC parameter；
Initial SOC parameter computing unit 303, if being also used to the current voltage not less than preset minimum voltage, root
The initial SOC parameter is calculated according to the SOC-OCV curve；
Charging and discharging currents acquiring unit 304, for obtaining the charging and discharging currents of the lithium battery；
Operating status judging unit 305 is sentenced for the comparison result according to the charging and discharging currents and preset running current
Break the operating status of the lithium battery, the operating status includes static condition, charged state and discharge condition；
Delay time searching unit 306 for recording the current voltage, and searches the corresponding delay of the operating status
Time；
Voltage recording unit 307 is updated, for recording the update voltage after the delay time；
Voltage difference computing unit 308, for calculating the current voltage and the voltage difference for updating voltage；
Amplitude of variation computing unit 309, for calculating the initial SOC parameter and the update voltage in the SOC-
The corresponding amplitude of variation for updating SOC parameter in OCV curve；
SOC parameter computing unit 310 is corrected, if being also used to the operating status is static condition, when the voltage
When difference is greater than preset voltage difference, amendment SOC parameter is calculated, the amendment SOC parameter is the initial SOC parameter and the update
The difference of SOC parameter, the product with the first preset proportion coefficient；
The amendment SOC parameter computing unit 310, if being also used to the operating status is charged state, when described
When voltage difference is greater than the preset voltage difference and the amplitude of variation greater than the first predetermined magnitude, amendment SOC parameter is calculated, it is described
Correcting SOC parameter is the initial SOC parameter and the difference for updating SOC parameter, the product with the first preset proportion coefficient；
The amendment SOC parameter computing unit 310, if being discharge condition for the operating status, when the electricity
Pressure difference is poor greater than the preset voltage, described update voltage is less than preset voltage critical value and the amplitude of variation is greater than first in advance
When setting amplitude, alternatively, the preset voltage is poor, the update voltage is not less than preset voltage critical value when the voltage difference is greater than
And the amplitude of variation be greater than the second predetermined magnitude when, calculate amendment SOC parameter, the amendment SOC parameter be the initial SOC
Parameter and the difference for updating SOC parameter, the product with the first preset proportion coefficient；
Estimate SOC parameter generation unit 311, it is raw for the initial SOC parameter to be added with the amendment SOC parameter
At estimation SOC parameter.
Further, as shown in figure 4, described device further include:
Full capacity value setting unit 401 calculates institute for the charge and discharge process founding mathematical models according to lithium battery
Before the SOC-OCV curve for stating lithium battery, when the lithium battery powers on, according to lithium battery parameter setting full capacity value；
Described device further include:
Full capacity value updating unit 402 updates the full appearance of the lithium battery after generation estimation SOC parameter
Magnitude；
SOC-OCV curve recalculates unit 403, for recalculating the SOC-OCV curve of the lithium battery.
Further, as shown in figure 5, the full capacity value updating unit 402, comprising:
First estimation SOC parameter computing module 501, if the operating status for the lithium battery is discharge condition,
Calculate the first estimation SOC parameter of the lithium battery；
Second estimation SOC parameter computing module 502, for calculating the lithium battery at the end of lithium battery electric discharge
Second estimation SOC parameter；
Capacity difference computing module 503, for calculating the capacity of the first estimation SOC parameter with the second estimation SOC parameter
Difference；
Full capacity value recalculates module 504, if being greater than the full appearance of the second preset proportion for the capacity difference
Magnitude recalculates the full capacity value then according to the capacity difference and the second estimation SOC parameter.
Further, the first estimation SOC parameter computing module, is used for: calculating the lithium electricity according to ampere integration method
The first estimation SOC parameter in pond；
The second estimation SOC parameter computing module, be used for: calculate the lithium battery according to ampere integration method second is estimated
Calculate SOC parameter.
Further, as shown in figure 5, the full capacity value updating unit 402, further includes:
Second estimation SOC parameter resets module 505, for the second estimation SOC parameter for calculating the lithium battery it
Afterwards, if the second estimation SOC parameter is less than the preset minimum voltage, the second estimation SOC parameter is reset to 0
Value；
The second estimation SOC parameter resets module 505, if being also used to the second estimation SOC parameter not less than institute
Preset minimum voltage is stated, then using the ratio of the second estimation SOC parameter and the first estimation SOC parameter as variation ratio
Example resets the second estimation SOC parameter.
The estimation device of lithium battery SOC provided by the present application a kind of, by calculating the SOC-OCV curve of lithium battery, then
It according to the comparison result of current voltage and preset minimum voltage, calculates or initial SOC parameter is set, then obtain filling for lithium battery
Discharge current judges the operating status of lithium battery, then then according to the comparison result of charging and discharging currents and preset running current
Record current voltage and search operating status for delay time, re-record the update voltage after delay time, then
It is calculating current voltage and is updating the voltage difference of voltage, then calculate initial SOC parameter and updating voltage in SOC-OCV curve
It is corresponding update SOC parameter amplitude of variation, further according to operating status calculate amendment SOC parameter, finally will output SOC parameter and
It corrects SOC parameter to be added, generates estimation SOC parameter.When SOC parameter is repaired in calculating, compared with prior art, the application being capable of root
According to the different conditions of lithium battery, different methods is used to judge open-circuit voltage values whether to need to mend according to the SOC parameter of calculating
It repays, SOC parameter will be then corrected if necessary to compensation and is set as initial SOC parameter and updates the difference of SOC parameter, and certain ratio
The product of example coefficient, is modified compensation on the basis of initial SOC parameter to correct SOC parameter, to improve estimation SOC parameter
Accuracy.
In the specific implementation, the present invention also provides a kind of computer storage mediums, wherein the computer storage medium can store
There is program, which may include step some or all of in each embodiment of method of calling provided by the invention when executing.Institute
The storage medium stated can for magnetic disk, CD, read-only memory (English: read-only memory, referred to as: ROM) or with
Machine storage memory (English: random access memory, referred to as: RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or
Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Same and similar part may refer to each other between each embodiment in this specification.Implement especially for device
For example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring in embodiment of the method
Explanation.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (10)
1. a kind of evaluation method of lithium battery SOC, which is characterized in that the described method includes:
According to the charge and discharge process founding mathematical models of lithium battery, the SOC-OCV curve of the lithium battery is calculated；
If the current voltage of the lithium battery is less than preset minimum voltage, 0 is set by the initial SOC parameter；
If the current voltage is not less than preset minimum voltage, the initial SOC is calculated according to the SOC-OCV curve and is joined
Number；
Obtain the charging and discharging currents of the lithium battery；
According to the comparison result of the charging and discharging currents and preset running current, the operating status of the lithium battery is judged, it is described
Operating status includes static condition, charged state and discharge condition；
The current voltage is recorded, and searches the corresponding delay time of the operating status；
Record the update voltage after the delay time；
Calculate the current voltage and the voltage difference for updating voltage；
Calculate the initial SOC parameter corresponding change for updating SOC parameter in the SOC-OCV curve with the update voltage
Change amplitude；
If the operating status is static condition, when the voltage difference is greater than preset voltage difference, amendment SOC ginseng is calculated
Number, the amendment SOC parameter is the initial SOC parameter and the difference for updating SOC parameter, with the first preset proportion coefficient
Product；
If the operating status is charged state, when the voltage difference is greater than the preset voltage difference and the amplitude of variation
When greater than the first predetermined magnitude, amendment SOC parameter is calculated, the amendment SOC parameter is the initial SOC parameter and the update
The difference of SOC parameter, the product with the first preset proportion coefficient；
If the operating status is discharge condition, when the voltage difference is greater than, the preset voltage is poor, the update voltage
Less than preset voltage critical value and when the amplitude of variation is greater than the first predetermined magnitude, alternatively, described in being greater than when the voltage difference
Preset voltage is poor, the update voltage is not less than preset voltage critical value and when the amplitude of variation is greater than the second predetermined magnitude,
Amendment SOC parameter is calculated, the amendment SOC parameter is the initial SOC parameter and the difference for updating SOC parameter, with the
The product of one preset proportion coefficient；
The initial SOC parameter is added with the amendment SOC parameter, generates estimation SOC parameter.
2. the method as described in claim 1, which is characterized in that described to establish mathematical modulo according to the charge and discharge process of lithium battery
Type, before the SOC-OCV curve for calculating the lithium battery, the method also includes:
When the lithium battery powers on, according to lithium battery parameter setting full capacity value；
After the generation estimation SOC parameter, the method also includes:
Update the full capacity value of the lithium battery；
Recalculate the SOC-OCV curve of the lithium battery.
3. method according to claim 2, which is characterized in that the full capacity value for updating lithium battery, comprising:
If the operating status of the lithium battery is discharge condition, the first estimation SOC parameter of the lithium battery is calculated；
At the end of lithium battery electric discharge, the second estimation SOC parameter of the lithium battery is calculated；
Calculate the capacity difference of the first estimation SOC parameter with the second estimation SOC parameter；
If the capacity difference is greater than the full capacity value of the second preset proportion, estimated according to the capacity difference and second
SOC parameter recalculates the full capacity value.
4. method as claimed in claim 3, which is characterized in that the first estimation SOC parameter for calculating the lithium battery, packet
It includes:
The first estimation SOC parameter of the lithium battery is calculated according to ampere integration method；
The second estimation SOC parameter for calculating the lithium battery, comprising:
The second estimation SOC parameter of the lithium battery is calculated according to ampere integration method.
5. method as claimed in claim 3, which is characterized in that the second estimation SOC parameter for calculating the lithium battery it
Afterwards, the method also includes:
If the second estimation SOC parameter is less than the preset minimum voltage, the second estimation SOC parameter is reset to
0 value；
If the second estimation SOC parameter is not less than the preset minimum voltage, with the second estimation SOC parameter and institute
The ratio of the first estimation SOC parameter is stated as variation ratio, resets the second estimation SOC parameter.
6. a kind of estimation device of lithium battery SOC, which is characterized in that described device includes:
SOC-OCV curve computation unit calculates the lithium battery for the charge and discharge process founding mathematical models according to lithium battery
SOC-OCV curve；
Initial SOC parameter setting unit will be described if the current voltage for the lithium battery is less than preset minimum voltage
Initial SOC parameter is set as 0；
Initial SOC parameter computing unit, if being not less than preset minimum voltage for the current voltage, according to the SOC-
OCV curve calculates the initial SOC parameter；
Charging and discharging currents acquiring unit, for obtaining the charging and discharging currents of the lithium battery；
Operating status judging unit, for the comparison result according to the charging and discharging currents and preset running current, described in judgement
The operating status of lithium battery, the operating status include static condition, charged state and discharge condition；
Delay time searching unit for recording the current voltage, and searches the corresponding delay time of the operating status；
Voltage recording unit is updated, for recording the update voltage after the delay time；
Voltage difference computing unit, for calculating the current voltage and the voltage difference for updating voltage；
Amplitude of variation computing unit, for calculating the initial SOC parameter and the update voltage in the SOC-OCV curve
The corresponding amplitude of variation for updating SOC parameter；
SOC parameter computing unit is corrected, if being also used to the operating status is static condition, when the voltage difference is greater than in advance
When setting voltage difference, amendment SOC parameter is calculated, the amendment SOC parameter is the initial SOC parameter and the update SOC parameter
Difference, the product with the first preset proportion coefficient；
The amendment SOC parameter computing unit, if being also used to the operating status is charged state, when the voltage difference is big
When the poor and described amplitude of variation is greater than the first predetermined magnitude in the preset voltage, amendment SOC parameter, the amendment SOC are calculated
Parameter is the initial SOC parameter and the difference for updating SOC parameter, the product with the first preset proportion coefficient；
The amendment SOC parameter computing unit, if being discharge condition for the operating status, when the voltage difference is greater than
The preset voltage is poor, described update voltage is less than preset voltage critical value and the amplitude of variation is greater than the first predetermined magnitude
When, alternatively, the preset voltage is poor, the update voltage is not less than preset voltage critical value and described when the voltage difference is greater than
Amplitude of variation be greater than the second predetermined magnitude when, calculate amendment SOC parameter, the amendment SOC parameter be the initial SOC parameter and
The difference for updating SOC parameter, the product with the first preset proportion coefficient；
It estimates SOC parameter generation unit, for the initial SOC parameter to be added with the amendment SOC parameter, generates estimation
SOC parameter.
7. device as claimed in claim 6, which is characterized in that described device further include:
Full capacity value setting unit calculates the lithium electricity for the charge and discharge process founding mathematical models according to lithium battery
Before the SOC-OCV curve in pond, when the lithium battery powers on, according to lithium battery parameter setting full capacity value；
Described device further include:
Full capacity value updating unit updates the full capacity value of the lithium battery after generation estimation SOC parameter；
SOC-OCV curve recalculates unit, for recalculating the SOC-OCV curve of the lithium battery.
8. device as claimed in claim 7, which is characterized in that the full capacity value updating unit, comprising:
First estimation SOC parameter computing module, if for the lithium battery operating status be discharge condition, calculate described in
First estimation SOC parameter of lithium battery；
Second estimation SOC parameter computing module, at the end of lithium battery electric discharge, calculate the lithium battery second to be estimated
Calculate SOC parameter；
Capacity difference computing module, for calculating the capacity difference of the first estimation SOC parameter with the second estimation SOC parameter；
Full capacity value recalculates module, if being greater than the full capacity value of the second preset proportion for the capacity difference,
According to the capacity difference and the second estimation SOC parameter, the full capacity value is recalculated.
9. device as claimed in claim 8, which is characterized in that the first estimation SOC parameter computing module is used for:
The first estimation SOC parameter of the lithium battery is calculated according to ampere integration method；
The second estimation SOC parameter computing module, is used for:
The second estimation SOC parameter of the lithium battery is calculated according to ampere integration method.
10. device as claimed in claim 9, which is characterized in that the full capacity value updating unit, further includes:
Second estimation SOC parameter resets module, after the second estimation SOC parameter for calculating the lithium battery, if
The second estimation SOC parameter is less than the preset minimum voltage, then the second estimation SOC parameter is reset to 0 value；
It is described second estimation SOC parameter reset module, if be also used to it is described second estimation SOC parameter not less than it is described it is preset most
Low-voltage resets institute then using the ratio of the second estimation SOC parameter and the first estimation SOC parameter as variation ratio
State the second estimation SOC parameter.
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