CN110058179A - SOH evaluation method, system, equipment and storage medium based on capacity attenuation - Google Patents
SOH evaluation method, system, equipment and storage medium based on capacity attenuation Download PDFInfo
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- G—PHYSICS
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- 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]
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Abstract
The present invention provides a kind of SOH evaluation method, system, equipment and storage medium based on capacity attenuation, this method include starting engine ignition signal, start kth+1 time driving；Then △ SOH is obtainedTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits；Then can judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalkThe open-circuit voltage OCV driven after closing engine ignition signal with kth -1 timek‑1, if it is not, with the SOH of storageIt depositsCalculate SOHk+1；If it can, then calculating SOH with revised SOHk+1；Finally by the SOHk+1It is stored as new SOHIt deposits.SOH evaluation method of the invention is mainly using the attenuation change for being primarily based on battery actual capacity estimated value, the time lifetime decaying and cycle life decaying of auxiliary battery, synthesis obtains the battery SOH coefficient based on capacity definition in real time, increase the Closed-cycle correction step of SOH in evaluation method, the estimation precision for improving SOH, be conducive to improve user experience and guarantee battery using safe.
Description
Technical field
The present invention relates to internet areas, specifically, be related to a kind of SOH evaluation method based on capacity attenuation, system,
Equipment and storage medium.
Background technique
New energy vehicle power battery is at it in use, all can slowly aging.The aging of battery system, is mainly reflected in two
A aspect: the decaying of battery capacity and the increase of the internal resistance of cell.So the continuous of vehicle is very paid close attention at family for pure electric vehicle
Mileage is sailed, and the decaying of the continual mileage of vehicle and battery capacity is closely bound up.Therefore, real-time accurate estimated driving force battery capacity
Attenuation, i.e., the cell health state (State of Health, SOH) based on capacity attenuation becomes particularly critical and again
It wants, because it will directly affect user experience.
Cell health state SOH indicates the percentage of the battery of battery after a period of use current capacity and factory capacity
Than.SOH is between 0-100%；SOH is that 100% expression battery is in service life starting point, indicates that battery reaches the service life when SOH is 0
Terminal, when SOH changes between 0-100%, value is bigger, indicates that battery pot life is longer, available cycles number is more.
The SOH for reasonably accurate estimating battery, facilitates the case where grasping cell degradation, to grasp battery maintenance and more
The opportunity changed；The factor of influence SOH and the variation of SOH are considered when designing control strategy, can achieve extension battery life
Purpose；More importantly reasonably accurate estimate SOH, it is known that during cell degradation parameter variation, to be
The SOC of accurate estimation each lifetime stage of battery lays the foundation.
The estimation method of existing mainstream SOH, the main method for using aggregated throughput, i.e., worked based on battery system
Charge/discharge ampere-hour number (Ah), the ampere-hour number of the charge/discharge of the total permission obtained with previous experiments is compared, then
Obtain the current SOH situation of battery, referred to as Ah counting method.This method major defect is to estimate for open loop, no correction
Link, it is difficult to ensure that precision, and the requirement to previous experiments data is very high.
It should be noted that information is only used for reinforcing the reason to background of the invention disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
For the problems of the prior art, the object of the present invention is to provide based on capacity attenuation SOH evaluation method,
System, equipment and storage medium increase the closed-loop corrected step of SOH, in SOH evaluation method to improve the estimation precision of SOH.
The embodiment provides a kind of 1. SOH evaluation methods based on capacity attenuation, which is characterized in that including with
Lower step:
S100: starting engine ignition signal starts kth+1 time driving；
S200: △ SOH is obtainedTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits, the △ SOHTime decayingFor based on battery time
The decaying of the health status in service life, the △ SOHLoop attenuationFor the decaying of the health status based on battery charging and discharging cycle life, deposit
The SOH of storageIt depositsThe SOH of the memory module storage of system when being driven for kth time；
S300: can judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalkIf cannot
Obtain OCVk, then continue step S400, if OCV can be obtainedk, then continue step S500；
S400: SOH is calculatedk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), then proceed to step S700；
S500: can judgement obtain kth -1 time OCV driven after closing engine ignition signalk-1；
If OCV cannot be obtainedk-1, then continue step S400；
If OCV can be obtainedk-1, then continue step S600；
S600: according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterIt is modified after being driven for kth time
SOH, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
S700: by the SOHk+1It is stored as new SOHIt deposits。
Preferably, the S200 step the following steps are included:
S210 :+1 the cumulative equivalent time of repose of battery, kth driving when driving are obtained kth+1 time and starts engine point
Battery is total when fiery signal and the kth secondary battery standing time driven between closing engine ignition signal, kth+1 time driving tires out
Count the accumulative charge and discharge ampere-hour number of battery in charge and discharge ampere-hour number, kth time driving procedure；
S220 :+1 the cumulative equivalent time of repose of battery, kth driving start engine point when being driven according to kth+1 time
Fiery signal and kth time drive the battery standing time closed between engine ignition signal and the battery standing time reflects with SOH
Firing table obtains the △ SOHTime decaying；
S230: battery in the secondary driving procedure of the total accumulative charge and discharge ampere-hour number of battery, kth when being driven according to kth+1 time
Accumulative charge and discharge ampere-hour number and circulating battery number and SOH mapping table obtain the △ SOHLoop attenuation。
Preferably, can the S300 judgement obtain kth time and drive the OCV after closing engine ignition signalkInclude:
Judge that+1 driving of kth starting engine ignition signal and kth time drive to close between engine ignition signal
Whether the battery standing time is greater than first threshold；
If so, being then regarded to obtain OCVk。
Preferably, described according to the OCV in the S600 stepkWith the OCVk-1It calculates and obtains SOHMeterStep packet
It includes:
S610: the OCV is obtained by OCV-SOC mapping tablekWith the OCVk-1Corresponding state-of-charge SOC respectivelyk
And SOCk-1；
S620: pass through the SOCkWith the SOCk-1Obtain CEstimation, the CEstimationFor in the kth time driving procedure of estimation
Battery capacity；
S630: it is calculated by formula (1) and obtains SOHMeter:
Wherein, CIt is specifiedThe rated capacity of battery when for SOH being 100%.
Preferably, in the step S620, (2) obtain C according to the following formulaEstimation:
Wherein, t is the battery working time in the kth time driving procedure, and i is battery operating current.
Preferably, further include following steps before step S700:
Judge SOHk+1Whether SOH is less thanIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsWhether second threshold is less than；
If SOHk+1Less than SOHIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsLess than second threshold, thening follow the steps S700 will
SOHk+1It is stored as new SOHIt deposits。
Preferably, the second threshold is less than or equal to 2%.
The embodiments of the present invention also provide a kind of SOH estimating system based on capacity attenuation, which is characterized in that including control
Molding block, memory module, judgment module and computing module, in which:
After the control module receives the starting engine ignition signal of beginning kth+1 time driving；
The control module obtains △ SOH from the memory moduleTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits, the △
SOHTime decayingFor the decaying of the health status based on the battery time service life, the △ SOHLoop attenuationTo recycle the longevity based on battery charging and discharging
The decaying of the health status of life, the SOH of storageIt depositsThe SOH of the memory module storage of system when being driven for kth time；
Can the judgment module judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalk；
If OCV cannot be obtainedk, then
The computing module calculates SOHk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), the memory module
By the SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedk, then
Can the judgment module judgement obtain kth -1 time OCV driven after closing engine ignition signalk-1；
If OCV can be obtainedkAnd OCV cannot be obtainedk-1, then
The computing module calculates SOHk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation)；The memory module
By SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedkAnd OCV can be obtainedk-1, then
The computing module is according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterAfter being driven for kth time
Modified SOH, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
The memory module is by SOHk+1It is stored as new SOHIt deposits。
The embodiments of the present invention also provide a kind of SOH estimation device based on capacity attenuation, comprising:
Processor；
Memory, wherein being stored with the executable instruction of the processor；
Wherein, the processor is configured to execute via the executable instruction is executed described based on capacity attenuation
The step of SOH evaluation method.
The embodiments of the present invention also provide a kind of computer readable storage mediums, for storing program, described program quilt
The step of SOH evaluation method based on capacity attenuation is realized when execution.
SOH evaluation method based on capacity attenuation of the invention is on the original single basis based on circulation handling capacity estimation
On, increase the Closed-cycle correction link of SOH, i.e., joined the initial value amendment based on actual capacity estimation when SOH is calculated, therefore,
It has the advantages that
A. △ SOH can suitably be reducedTime decayingWith △ SOHLoop attenuationThe requirement of part computational accuracy, to reduce early period to this
The requirement of two parts experimental data amount；
The calculating of B.SOH can guarantee dullness variation downwards, and the downward amplitude of variation of single is no more than 2%, improve and true
The goodness of fit of the real slow degeneracy of battery；
Method in the present invention improves the estimation precision of power battery SOH, to can greatly improve user experience, together
When, the evaluation method of accurate SOH is also to guarantee that battery uses safe premise.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application, by reading referring to the following drawings to non-limiting embodiment institute
The detailed description of work, other features, purposes and advantages of the invention will become more apparent.It should be evident that in being described below
Attached drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not making the creative labor
Under the premise of, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of the SOH evaluation method based on capacity attenuation of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the SOH estimating system based on capacity attenuation of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of the SOH estimation device based on capacity attenuation of one embodiment of the invention；
Fig. 4 is the structural schematic diagram of the computer readable storage medium of one embodiment of the invention.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be incorporated in any suitable manner in one or more embodiments.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.Identical attached drawing mark in figure
Note indicates same or similar part, thus will omit repetition thereof.Some block diagrams shown in the drawings are function
Energy entity, not necessarily must be corresponding with physically or logically independent entity.These function can be realized using software form
Energy entity, or these functional entitys are realized in one or more hardware modules or integrated circuit, or at heterogeneous networks and/or place
These functional entitys are realized in reason device device and/or microcontroller device.
Fig. 1 is the flow chart of the SOH evaluation method based on capacity attenuation of one embodiment of the invention, and this method specifically includes
Following steps:
S100: starting engine ignition signal, starting kth+1 time, (k is the integer greater than 1) drives；Start engine point
Fiery signal (K15), running car can regard a driving cycle as using battery, closing engine ignition signal, herein kth+1
Secondary driving, which can be regarded as, this time to be driven；
S200: △ SOH is obtainedTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits, the △ SOHTime decayingFor based on battery time
The decaying of the health status in service life, the △ SOHLoop attenuationFor the decaying of the health status based on battery charging and discharging cycle life；It deposits
The SOH of storageIt depositsThe SOH of the memory module storage of system when being driven for kth time；Correspondingly, kth time, which drives, can regard last as
It drives.
Specifically, S200 step may include: again
S210 :+1 the cumulative equivalent time of repose of battery, kth driving when driving are obtained kth+1 time and starts engine point
Battery is total when fiery signal and the kth secondary battery standing time driven between closing engine ignition signal, kth+1 time driving tires out
Count the accumulative charge and discharge ampere-hour number of battery in charge and discharge ampere-hour number, kth time driving procedure；
S220 :+1 the cumulative equivalent time of repose of battery, kth driving start engine point when being driven according to kth+1 time
Fiery signal kth time drives the battery standing time closed between engine ignition signal and battery standing time and SOH maps
Table obtains the △ SOHTime decaying；Usually in practice, a kind of battery obtains the curve of battery standing time and SOH by experiment,
Battery standing time and SOH mapping table are obtained by empirical curve.
S230: battery in the secondary driving procedure of the total accumulative charge and discharge ampere-hour number of battery, kth when being driven according to kth+1 time
Accumulative charge and discharge ampere-hour number and circulating battery number and SOH mapping table obtain the △ SOHLoop attenuation。
In general, every time in driving procedure, the battery charging and discharging ampere-hour number that system accounting is calculated, and by each driving of calculating
Charge and discharge ampere-hour number in the process is cumulative, obtains the total accumulative charge and discharge ampere-hour number of battery.The calculating of battery charging and discharging ampere-hour number
It can be ampere-hour integral operation method:
Wherein, t is the battery working time in driving procedure, and i is battery operating current.
By the ampere-hour number of the charge and discharge of the battery of system record, in conjunction with the rated capacity C of batteryIt is specified, correspondence can be obtained
Circulating battery times N.Similarly, a kind of dynamic circulating battery number of battery and SOH curve are generally obtained by previous experiments,
Circulating battery number and SOH mapping table are obtained by empirical curve.
S300: can judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalkIf cannot
Obtain OCVk, then continue step S400, if OCV can be obtainedk, then continue step S500.Herein, OCVkAcquisition need to judge
Kth+1 time battery standing time driven between starting engine ignition signal and kth time driving closing engine ignition signal.
Can judgement obtain open-circuit voltage OCV in above-mentioned steps, and mainly judgement, which drives, terminates to close engine ignition letter
The battery standing time after number, in one embodiment of the invention, as long as the battery standing time is longer than 1 hour, then it is assumed that can obtain
OCV, the first threshold in this embodiment is 1 hour.
S400: SOH is calculatedk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), then proceed to step S700；
S500: can judgement obtain kth -1 time OCV driven after closing engine ignition signalk-1；Similarly, judge
Method is identical as in above-mentioned steps S300, the difference is that OCVk-1Acquisition need to judge that kth time drives starting engine
The battery standing time between engine ignition signal is closed in ignition signal and kth -1 time driving.
If OCV cannot be obtainedk-1, then continue S400 step；
If OCV can be obtainedk-1, then continue step S600；
S600: according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterIt is modified after being driven for kth time
SOH, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
OCV can be obtained simultaneouslykAnd OCVk-1, the condition for meeting amendment SOH can be regarded as.
As above-mentioned, cell health state SOH can be expressed as capacity and the factory of the battery of battery after a period of use
When rated capacity percentage, i.e. formula (1):
Wherein, CIt is specifiedThe rated capacity of battery when for SOH being 100%.
When OCV can be obtainedkAnd OCVk-1, it can the variation that front and back OCV is driven according to kth time calculates battery capacity
The variation of C.
SOH in step S600MeterAcquisition, correspondingly may comprise steps of:
S610: the OCV is obtained by OCV-SOC mapping tablekWith the OCVk-1Corresponding battery dump energy respectively
SOCkAnd SOCk-1；SOC (state of charge) is battery dump energy；
S620: pass through the SOCkWith the SOCk-1Obtain CEstimation, the CEstimationFor in the kth time driving procedure of estimation
Battery capacity；
Specifically, CEstimationMeet following formula:
Δ Q is the variable quantity of battery capacity in kth time driving procedure, and Δ Q can be charging process, be also possible to discharge
Battery charging and discharging ampere-hour number in caused electric quantity change in journey, i.e. kth time driving procedure,T herein is kth
Battery working time in secondary driving procedure.
△ SOC is the variable quantity that kth time drives front and back SOC, i.e. △ SOC=SOCk-SOCk-1；
Therefore, (2) C can be obtained according to the following formulaEstimation:
Last S630 step again, calculates according to formula (1) and obtains SOHMeter:
In above formula, f (OCV) is expressed as the corresponding SOC obtained based on OCV-SOC mapping table by open-circuit voltage OCV.
By taking above-described embodiment as an example, in the real-time SOH evaluation method of the present invention, i.e., SOH when this (kth+1 time) drivesk+1
Estimation, drive the situation influenced on SOH for last (kth time) can be obtained, then SOH be modified, using repairing
SOH after just estimates SOHk+1；SOH is modified for cannot obtain, then estimates SOH using the SOH of the newest storage of systemk+1。
Method final step S700 of the invention is by SOHk+1It is stored as new SOHIt deposits。
Meanwhile when storing new SOH, it is contemplated that the SOH of battery is dull gradual amount, so may be used also before step S700
To include the following steps:
Judge SOHk+1Whether SOH is less thanIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsWhether second threshold is less than；
If SOHk+1Less than SOHIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsLess than second threshold, then execute SOHk+1It is stored as
New SOHIt deposits.Second threshold can be set according to time battery condition, and second threshold is smaller than equal to 2%.
Ensure that in this step only allows SOH to adjust downwards, and single adjustment amplitude is not more than 2%, to ensure that SOH is calculated
As a result stability.
Fig. 2 is the structural schematic diagram of the SOH estimating system based on capacity attenuation of one embodiment of the invention, which includes
Control module M100, memory module M200, judgment module M300 and computing module M400, in which:
After the control module M100 receives the starting engine ignition signal of beginning kth+1 time driving；
The control module M100 obtains △ SOH from the memory module M200Time decaying、△SOHLoop attenuationWith storage
SOHIt deposits, the △ SOHTime decayingFor the decaying of the health status based on the battery time service life, the △ SOHLoop attenuationFor based on battery
The decaying of the health status of charge and discharge circulation life；The SOH of storageIt depositsThe memory module storage of system when being driven for kth time
SOH；The memory module is generally non-volatile memory modules；
Can the judgment module M300 judgement obtain kth time and drive open-circuit voltage after closing engine ignition signal
OCVk；
If OCV cannot be obtainedk, then
The computing module M400 calculates SOHk+1；
SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), the memory module is by SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedk, then
Can the judgment module M300 judgement obtain -1 driving of kth and close OCV after engine ignition signalk-1；
If OCV can be obtainedkAnd OCV cannot be obtainedk-1, then
The computing module M400 calculates SOHk+1；
SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), the memory module is by SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedkAnd OCV can be obtainedk-1, then
The computing module M400 is according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterIt is driven for kth time
Rear modified SOH is sailed, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
The memory module M200 is by SOHk+1It is stored as new SOHIt deposits。
The electronic equipment 600 of this embodiment according to the present invention is described referring to Fig. 3.The electronics that Fig. 3 is shown
Equipment 600 is only an example, should not function to the embodiment of the present invention and use scope bring any restrictions.
As shown in figure 3, electronic equipment 600 is showed in the form of universal computing device.The component of electronic equipment 600 can wrap
Include but be not limited to: at least one processing unit 610, at least one storage unit 620, connection different platform component (including storage
Unit 620 and processing unit 610) bus 630, display unit 640 etc..
Wherein, storage unit is stored with program code, and program code can be executed with unit 610 processed, so that processing is single
Member 610 executes various exemplary implementations according to the present invention described in this specification above-mentioned electronic prescription circulation processing method part
The step of mode.For example, processing unit 610 can execute step as shown in fig. 1.
Storage unit 620 may include the readable medium of volatile memory cell form, such as Random Access Storage Unit
(RAM) 6201 and/or cache memory unit 6202, it can further include read-only memory unit (ROM) 6203.
Storage unit 620 can also include program/utility with one group of (at least one) program module 6205
6204, such program module 6205 includes but is not limited to: operating system, one or more application program, other program moulds
It may include the realization of network environment in block and program data, each of these examples or certain combination.
Bus 630 can be to indicate one of a few class bus structures or a variety of, including storage unit bus or storage
Cell controller, peripheral bus, graphics acceleration port, processing unit use any bus structures in a variety of bus structures
Local bus.
Electronic equipment 600 can also be with one or more external equipments 700 (such as keyboard, sensing equipment, bluetooth equipment
Deng) communication, can also be enabled a user to one or more equipment interact with the electronic equipment 600 communicate, and/or with make
Any equipment (such as the router, modulation /demodulation that the electronic equipment 600 can be communicated with one or more of the other calculating equipment
Device etc.) communication.This communication can be carried out by input/output (I/O) interface 650.Also, electronic equipment 600 can be with
By network adapter 660 and one or more network (such as local area network (LAN), wide area network (WAN) and/or public network,
Such as internet) communication.Network adapter 660 can be communicated by bus 630 with other modules of electronic equipment 600.It should
Understand, although not shown in the drawings, other hardware and/or software module can be used in conjunction with electronic equipment 600, including but unlimited
In: microcode, device driver, redundant processing unit, external disk drive array, RAID system, tape drive and number
According to backup storage platform etc..
The embodiment of the present invention also provides a kind of computer readable storage medium, and for storing program, program is performed realization
The step of sorting the SOH evaluation method based on capacity attenuation.In some possible embodiments, various aspects of the invention are also
It can be implemented as a kind of form of program product comprising program code, when program product is run on the terminal device, program
Code is for executing terminal device described in this specification above-mentioned electronic prescription circulation processing method part according to the present invention
The step of various illustrative embodiments.
Refering to what is shown in Fig. 4, describing the program product for realizing the above method of embodiment according to the present invention
800, can using portable compact disc read only memory (CD-ROM) and including program code, and can in terminal device,
Such as it is run on PC.However, program product of the invention is without being limited thereto, in this document, readable storage medium storing program for executing can be with
To be any include or the tangible medium of storage program, the program can be commanded execution system, device or device use or
It is in connection.
Program product can be using any combination of one or more readable mediums.Readable medium can be readable signal Jie
Matter or readable storage medium storing program for executing.Readable storage medium storing program for executing for example can be but be not limited to electricity, magnetic, optical, electromagnetic, infrared ray or partly lead
System, device or the device of body, or any above combination.More specific example (the non exhaustive column of readable storage medium storing program for executing
Table) it include: the electrical connection with one or more conducting wires, portable disc, hard disk, random access memory (RAM), read-only storage
Device (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disc read only memory (CD-
ROM), light storage device, magnetic memory device or above-mentioned any appropriate combination.
Computer readable storage medium may include in a base band or as carrier wave a part propagate data-signal,
In carry readable program code.The data-signal of this propagation can take various forms, including but not limited to electromagnetic signal,
Optical signal or above-mentioned any appropriate combination.Readable storage medium storing program for executing can also be any readable Jie other than readable storage medium storing program for executing
Matter, the readable medium can send, propagate or transmit for by instruction execution system, device or device use or and its
The program of combined use.The program code for including on readable storage medium storing program for executing can transmit with any suitable medium, including but not
It is limited to wireless, wired, optical cable, RF etc. or above-mentioned any appropriate combination.
The program for executing operation of the present invention can be write with any combination of one or more programming languages
Code, programming language include object oriented program language-Java, C++ etc., further include conventional process
Formula programming language-such as " C " language or similar programming language.Program code can be calculated fully in user
It executes in equipment, partly execute on a user device, executing, as an independent software package partially in user calculating equipment
Upper part executes on a remote computing or executes in remote computing device or server completely.It is being related to remotely counting
In the situation for calculating equipment, remote computing device can pass through the network of any kind, including local area network (LAN) or wide area network
(WAN), it is connected to user calculating equipment, or, it may be connected to external computing device (such as utilize ISP
To be connected by internet).
In conclusion the present invention provides a kind of, SOH evaluation method, system, equipment and storage based on capacity attenuation are situated between
Matter, this method include starting engine ignition signal, start kth+1 time driving；Then △ SOH is obtainedTime decaying、△SOHLoop attenuationWith
The SOH of storageIt deposits；Then can judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalkWith kth -1
The secondary open-circuit voltage OCV driven after closing engine ignition signalk-1, if it is not, with the SOH of storageIt depositsCalculate SOHk+1；Such as
Fruit can, then with revised SOH calculate SOHk+1；Finally by the SOHk+1It is stored as new SOHIt deposits。
SOH evaluation method of the invention mainly using being primarily based on the attenuation change of battery actual capacity estimated value, it is auxiliary it
The time lifetime decaying of battery and cycle life decaying, synthesis obtain the SOH of the battery based on capacity definition in real time, estimation side
The Closed-cycle correction step for increasing SOH in method, improves the estimation precision of SOH.If SOH estimation is accurate, the practical appearance of battery
Amount can be estimated accurate.One accurate battery capacity is to accurately calculate the basic premise of battery dump energy SOC, so quasi-
True SOH can guarantee that an accurate battery capacity, accurate battery capacity just can guarantee accurate SOC.Accurate SOC is direct
Determine the car experience of user, while accurately SOC is also that vehicle remaining mileage estimates accurate premise.At the same time, such as
Battery capacity and SOC estimation after fruit aging is inaccurate, then is easy to the danger that over-discharge occurs, overcharges, and the accurate estimation of SOH is also
The battery system premise that the phase is safely operated after use.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.It is obvious to a person skilled in the art that the application be not limited to it is above-mentioned
The details of exemplary embodiment, and without departing substantially from spirit herein or essential characteristic, it can be with others tool
Body form realizes the application.It therefore, in all respects, the embodiments should be taken as exemplary, and is non-limit
Property processed, scope of the present application is indicated by the appended claims rather than the foregoing description, it is intended that claim will be fallen in
All changes in the meaning and scope of equivalency are included in the application.It should not be by any appended drawing reference in claim
It is construed as limiting the claims involved.Furthermore, it is to be understood that one word of " comprising " does not exclude other units or steps, odd number is not excluded for multiple
Number.The multiple units or device stated in device claim can also by a unit or device by software or hardware come
It realizes.First, second equal words are used to indicate names, and are not indicated any particular order.
Claims (10)
1. a kind of SOH evaluation method based on capacity attenuation, which comprises the following steps:
S100: starting engine ignition signal starts kth+1 time driving；
S200: △ SOH is obtainedTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits, the △ SOHTime decayingFor based on the battery time service life
Health status decaying, the △ SOHLoop attenuationFor the decaying of the health status based on battery charging and discharging cycle life, storage
SOHIt depositsThe SOH of the memory module storage of system when being driven for kth time；
S300: can judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalkIf cannot obtain
OCVk, then continue step S400, if OCV can be obtainedk, then continue step S500；
S400: SOH is calculatedk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), then proceed to step S700；
S500: can judgement obtain kth -1 time OCV driven after closing engine ignition signalk-1；
If OCV cannot be obtainedk-1, then continue step S400；
If OCV can be obtainedk-1, then continue step S600；
S600: according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterModified SOH after being driven for kth time, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
S700: by the SOHk+1It is stored as new SOHIt deposits。
2. the SOH evaluation method according to claim 1 based on capacity attenuation, which is characterized in that the S200 step packet
Include following steps:
S210: the cumulative equivalent time of repose of battery when driving ,+1 driving of kth starting engine ignition letter are obtained kth+1 time
Total accumulative of battery is filled when number driving the battery standing time closed between engine ignition signal kth time, drive for kth+1 time
The accumulative charge and discharge ampere-hour number of battery in ampere-hour number, the kth of discharging time driving procedure；
S220: the cumulative equivalent time of repose of battery ,+1 driving of kth starting engine ignition letter when being driven according to kth+1 time
Number the battery standing time closed between engine ignition signal and battery standing time and SOH mapping table are driven kth time
Obtain the △ SOHTime decaying；
S230: battery total accumulative charge and discharge ampere-hour number when being driven according to kth+1 time, battery is accumulative in kth time driving procedure
Charge and discharge ampere-hour number and circulating battery number and SOH mapping table obtain the △ SOHLoop attenuation。
3. the SOH evaluation method according to claim 2 based on capacity attenuation, which is characterized in that the S300 judges energy
The no kth time that obtains drives the OCV after closing engine ignition signalkInclude:
Judge kth+1 time battery driven between starting engine ignition signal and kth time driving closing engine ignition signal
Whether time of repose is greater than first threshold；
If so, being then regarded to obtain OCVk。
4. the SOH evaluation method according to claim 1 based on capacity attenuation, which is characterized in that in the S600 step
It is described according to the OCVkWith the OCVk-1It calculates and obtains SOHMeterStep includes:
S610: the OCV is obtained by OCV-SOC mapping tablekWith the OCVk-1Corresponding state-of-charge SOC respectivelykWith
SOCk-1；
S620: pass through the SOCkWith the SOCk-1Obtain CEstimation, the CEstimationHold for the battery in the kth time driving procedure of estimation
Amount；
S630: it is calculated by formula (1) and obtains SOHMeter:
Wherein, CIt is specifiedThe rated capacity of battery when for SOH being 100%.
5. the SOH evaluation method according to claim 4 based on capacity attenuation, which is characterized in that in the step S620,
(2) obtain C according to the following formulaEstimation:
Wherein, t is the battery working time in the kth time driving procedure, and i is battery operating current.
6. the SOH evaluation method according to claim 1 based on capacity attenuation, which is characterized in that before step S700 also
Include the following steps:
Judge SOHk+1Whether SOH is less thanIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsWhether second threshold is less than；
If SOHk+1Less than SOHIt depositsAnd (SOHIt deposits-SOHk+1)/SOHIt depositsLess than second threshold, S700 is thened follow the steps by SOHk+1It deposits
The SOH of Chu WeixinIt deposits。
7. the SOH evaluation method according to claim 6 based on capacity attenuation, which is characterized in that the second threshold is small
In equal to 2%.
8. a kind of SOH estimating system based on capacity attenuation, which is characterized in that including control module, memory module, judgment module
And computing module, in which:
After the control module receives the starting engine ignition signal of beginning kth+1 time driving；
The control module obtains △ SOH from the memory moduleTime decaying、△SOHLoop attenuationWith the SOH of storageIt deposits, the △
SOHTime decayingFor the decaying of the health status based on the battery time service life, the △ SOHLoop attenuationTo recycle the longevity based on battery charging and discharging
The decaying of the health status of life, the SOH of storageIt depositsThe SOH of the memory module storage of system when being driven for kth time；
Can the judgment module judgement obtain kth time and drive the open-circuit voltage OCV after closing engine ignition signalk；
If OCV cannot be obtainedk, then
The computing module calculates SOHk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation), the memory module is by institute
State SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedk, then
Can the judgment module judgement obtain kth -1 time OCV driven after closing engine ignition signalk-1；
If OCV can be obtainedkAnd OCV cannot be obtainedk-1, then
The computing module calculates SOHk+1, SOHk+1=SOHIt deposits-(△SOHTime decaying+△SOHLoop attenuation)；The memory module will
SOHk+1It is stored as new SOHIt deposits；
If OCV can be obtainedkAnd OCV can be obtainedk-1, then
The computing module is according to the OCVkWith the OCVk-1It calculates and obtains SOHMeter, the SOHMeterIt is corrected after being driven for kth time
SOH, and
SOHk+1=SOHMeter-(△SOHTime decaying+△SOHLoop attenuation)；
The memory module is by SOHk+1It is stored as new SOHIt deposits。
9. a kind of SOH estimation device based on capacity attenuation characterized by comprising
Processor；
Memory, wherein being stored with the executable instruction of the processor；
Wherein, the processor is configured to come described in perform claim 1 to 7 any one of requirement via the execution executable instruction
The step of SOH evaluation method based on capacity attenuation.
10. a kind of computer readable storage medium, for storing program, which is characterized in that described program is performed realization power
Benefit requires the step of SOH evaluation method described in 1 to 7 any one based on capacity attenuation.
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