CN108931739A - The determination method, apparatus and automobile of battery system SOC estimation error - Google Patents
The determination method, apparatus and automobile of battery system SOC estimation error Download PDFInfo
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- CN108931739A CN108931739A CN201810971854.2A CN201810971854A CN108931739A CN 108931739 A CN108931739 A CN 108931739A CN 201810971854 A CN201810971854 A CN 201810971854A CN 108931739 A CN108931739 A CN 108931739A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The embodiment of the invention discloses a kind of determination method, apparatus of battery system SOC estimation error and automobiles, method therein includes: that the first SOC theoretical assessment, the 2nd SOC theoretical assessment and the battery rated capacity based on on-vehicle battery packet during charge or discharge obtain battery theory variation capacity, it acquires the electric current during vehicle-mounted battery pack recharges here or discharges and carries out integral calculation and obtain battery actual change capacity, SOC estimation error is determined according to battery actual change capacity and battery theory variation capacity.Method, apparatus and automobile of the invention, it can not need charging/discharging apparatus and obtain SOC estimation error, can capacity based on actual change and theoretical capacity changing value obtain error existing for SOC estimated value, determining SOC estimation error accuracy with higher, and the use cost of charging/discharging apparatus can be saved.
Description
Technical field
The present invention relates to electric vehicle engineering field more particularly to a kind of determination method of battery system SOC estimation error,
Device and automobile.
Background technique
At present, even there is problems, Vehicular dynamic battery and its Energy Management System conduct in the development of electric car
Key technology therein is always the emphasis studied, and to power battery charged state SOC (State Of Charge, charged shape
State) accurate estimation be the premise for guaranteeing power battery management system and operating normally.While SOC estimates strategy Development,
The test method of efficiently and accurately is needed to verify the error of estimation precision whether in scope of design.Currently, common detection side
Method is, through obtaining practical SOC than after with rated capacity work, to try with operating condition by battery charging and discharging device measuring actual battery capacity
SOC before testing compares, so that it is determined that SOC estimation error.It, just can not be to actually estimating but in the case where no charging/discharging apparatus
The result for calculating measurement carries out validity test verifying, and original method is just no longer applicable in.Therefore, it is necessary to a kind of new determination SOC estimations
The technical solution of error.
Summary of the invention
In view of this, the embodiment of the present invention provides the determination method, apparatus and vapour of a kind of battery system SOC estimation error
Vehicle.
According to an aspect of an embodiment of the present invention, a kind of determination method of battery system SOC estimation error is provided, is wrapped
It includes: estimating that strategy obtains first SOC theoretical assessment, twoth SOC of the on-vehicle battery packet during charge or discharge according to SOC
Theoretical assessment；Based on the first SOC theoretical assessment, the 2nd SOC theoretical assessment and the on-vehicle battery packet
Battery rated capacity obtain the on-vehicle battery packet during charge or discharge battery theory variation capacity；Described in acquisition
On-vehicle battery packet recharge here or discharge during electric current, integral calculation is carried out based on the electric current and obtains the on-vehicle battery
The battery actual change capacity of packet；Determine that SOC estimates based on the battery actual change capacity and battery theory variation capacity
Calculate error.
Optionally, described to estimate that strategy obtains first SOC of on-vehicle battery packet during charge or discharge and manages according to SOC
By estimated value, the 2nd SOC theoretical assessment include: obtain preset cell voltage and SOC dynamically associate curve；Described in acquisition
The cell voltage of on-vehicle battery packet obtains the first SOC reason according to the cell voltage and according to the curve that dynamically associates
By estimated value and the 2nd SOC theoretical assessment.
Optionally, the operating ambient temperature of the on-vehicle battery is acquired, is obtained corresponding with the operating ambient temperature
It is described to dynamically associate curve.
Optionally, the battery theory for obtaining the on-vehicle battery packet during charge or discharge changes capacity packet
It includes: obtaining the SOC difference of the first SOC theoretical assessment and the 2nd SOC theoretical assessment；By the SOC difference
The product of absolute value and the battery rated capacity changes capacity as the battery theory.
Optionally, described that the battery actual change appearance that integral calculation obtains the on-vehicle battery packet is carried out based on the electric current
Amount includes: the setting unit time, obtains the current value of the on-vehicle battery packet acquired within the unit time；By the electricity
Flow valuve and the product of the unit time are as accumulation of electrical current value；By each unit time during with the charge or discharge
Corresponding accumulation of electrical current value carries out accumulation calculating, obtains the battery actual change capacity.
Optionally, described to determine that SOC is estimated based on the battery actual change capacity and battery theory variation capacity
Error includes: to obtain the capacity difference of the battery actual change capacity and battery theory variation capacity；Obtain the appearance
Measure difference absolute value and the battery rated capacity capacity ratio, will using percentage indicate the capacity ratio as
SOC estimation error value.
Optionally, when to Vehicular charging, the electric current of the on-vehicle battery packet is acquired, the battery is practical to be become to obtain
Change capacity, determines the SOC estimation error in charging process；In vehicle travel process, the on-vehicle battery packet is acquired
Electric current determines the SOC estimation error in discharge process to obtain the battery actual change capacity.
According to another aspect of the present invention, a kind of determining device of battery system SOC estimation error is provided, comprising: SOC reason
Module is obtained by value, it is theoretical for estimating that strategy obtains first SOC of on-vehicle battery packet during charge or discharge according to SOC
Estimated value, the 2nd SOC theoretical assessment；Theory variation capacity obtain module, for based on the first SOC theoretical assessment,
The battery rated capacity of the 2nd SOC theoretical assessment and the on-vehicle battery packet obtains the on-vehicle battery packet and is charging
Or the battery theory during electric discharge changes capacity；Actual change capacity obtains module, exists for acquiring the on-vehicle battery packet
Electric current during this charge or discharge carries out the battery reality that integral calculation obtains the on-vehicle battery packet based on the electric current
Change capacity；SOC estimation error determining module, for being held based on the battery actual change capacity and battery theory variation
It measures and determines SOC estimation error.
Optionally, the SOC theoretical value obtains module, dynamically associates song for obtain preset cell voltage and SOC
Line；The cell voltage for acquiring the on-vehicle battery packet obtains institute according to the cell voltage and according to the curve that dynamically associates
State the first SOC theoretical assessment and the 2nd SOC theoretical assessment.
Optionally, the SOC theoretical value obtains module, for acquiring the operating ambient temperature of the on-vehicle battery, obtains
Curve is dynamically associated described in corresponding with the operating ambient temperature.
Optionally, the theoretical variation capacity obtains module, for obtaining the first SOC theoretical assessment and described the
The SOC difference of two SOC theoretical assessments；Using the product of the absolute value of the SOC difference and the battery rated capacity as institute
State battery theory variation capacity.
Optionally, the actual change capacity obtains module, is used for the setting unit time, obtains within the unit time
The current value of the on-vehicle battery packet of acquisition；Using the product of the current value and the unit time as accumulation of electrical current value；
Accumulation of electrical current value corresponding to each unit time during with the charge or discharge is subjected to accumulation calculating, described in acquisition
Battery actual change capacity.
Optionally, the SOC estimation error determining module, for obtaining the battery actual change capacity and the battery
The capacity difference of theory variation capacity；The absolute value of the capacity difference and the capacity ratio of the battery rated capacity are obtained,
Using the capacity ratio indicated using percentage as SOC estimation error value.
Optionally, the actual change capacity obtains module, for acquiring the on-vehicle battery packet when to Vehicular charging
Electric current determine the SOC estimation error in charging process to obtain the battery actual change capacity；In vehicle row
During sailing, the electric current of the on-vehicle battery packet is acquired, to obtain the battery actual change capacity, is determined in discharge process
SOC estimation error.
According to another aspect of the invention, a kind of automobile is provided, comprising: battery system SOC estimation error as described above
Determining device.
According to another aspect of the invention, a kind of determining device of battery system SOC estimation error is provided, comprising: storage
Device；And it is coupled to the processor of the memory, the processor is configured to the finger based on storage in the memory
It enables, executes method as described above.
In accordance with a further aspect of the present invention, a kind of computer readable storage medium is provided, computer program is stored thereon with
The step of instruction, which realizes method as described above when being executed by one or more processors.
The determination method, apparatus and automobile of battery system SOC estimation error of the invention, are being filled based on on-vehicle battery packet
Electricity or the first SOC theoretical assessment in discharge process, the 2nd SOC theoretical assessment and battery rated capacity obtain battery reason
By variation capacity, acquires the electric current during vehicle-mounted battery pack recharges here or discharges and carry out integral calculation acquisition battery reality
Change capacity, SOC estimation error is determined according to battery actual change capacity and battery theory variation capacity；Charge and discharge can not be needed
Electric equipment and obtain SOC estimation error, can the capacity based on actual change show that SOC estimated value is deposited with theoretical capacity changing value
Error, determining SOC estimation error accuracy with higher, and the use cost of charging/discharging apparatus can be saved.
The additional aspect of the embodiment of the present invention and advantage will be set forth in part in the description, these will be retouched from following
Become obvious in stating, or practice through the invention is recognized.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without any creative labor, also
Other attached drawings can be obtained according to these attached drawings:
Fig. 1 is the flow chart of one embodiment of the determination method of battery system SOC estimation error according to the present invention；
Fig. 2 is the module signal of one embodiment of the determining device of battery system SOC estimation error according to the present invention
Figure；
Fig. 3 is that the module of another embodiment of the determining device of battery system SOC estimation error according to the present invention is shown
It is intended to.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes one or more associated wholes for listing item or any cell and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
" first " hereinafter, " second " etc. is distinguish in description, there is no other special meanings.
Fig. 1 is the flow chart of one embodiment of the determination method of battery system SOC estimation error according to the present invention, such as
Shown in Fig. 1:
Step 101, estimate that strategy obtains first SOC theory of on-vehicle battery packet during charge or discharge according to SOC
Estimated value, the 2nd SOC theoretical assessment.First SOC theoretical assessment, the 2nd SOC theoretical assessment can be set, for example, the
One SOC theoretical assessment can be more than or less than the 2nd SOC theoretical assessment, and the first SOC theoretical assessment and the 2nd SOC are theoretical
The absolute value of the difference of estimated value is 40%, 50% etc..
Step 102, the battery volume based on the first SOC theoretical assessment, the 2nd SOC theoretical assessment and on-vehicle battery packet
Constant volume obtains battery theory of on-vehicle battery packet during charge or discharge and changes capacity.Refer to vehicle during charge or discharge
During the time that the SOC theoretical assessment for carrying battery pack becomes the 2nd SOC theoretical assessment from the first SOC theoretical assessment.
Step 103, the electric current during vehicle-mounted battery pack recharges here or discharges is acquired, integral calculation is carried out based on electric current
Obtain the battery actual change capacity of on-vehicle battery packet.
Step 104, SOC estimation error is determined based on battery actual change capacity and battery theory variation capacity.
The electric current of vehicle-mounted battery pack can be acquired when to Vehicular charging, to obtain battery actual change capacity, determined
SOC estimation error in charging process.The electric current of vehicle-mounted battery pack can also be acquired, to obtain in vehicle travel process
Battery actual change capacity determines the SOC estimation error in discharge process.
The determination method of battery system SOC estimation error in above-described embodiment can test dynamic in no charging/discharging apparatus
In the case where power battery actual capacity, the SOC estimation error for carrying the battery system on vehicle is effectively verified.
In one embodiment, SOC estimate strategy can there are many, according to SOC estimate strategy obtain on-vehicle battery packet exist
The first SOC theoretical assessment, the 2nd SOC theoretical assessment during charge or discharge can there are many.For example, obtaining default
Cell voltage and SOC dynamically associate curve, the cell voltage of vehicle-mounted battery pack is acquired, according to cell voltage and according to dynamic
Invariance curve obtains the first SOC theoretical assessment and the 2nd SOC theoretical assessment.A plurality of curve can be had by dynamically associating curve,
The operating ambient temperature of on-vehicle battery is acquired, acquisition is corresponding with operating ambient temperature to dynamically associate curve.
State-of-charge SOC (state of charge) is a key parameter of power battery, for indicating remaining battery
Electricity.The SOC of power battery is related to many factors, such as temperature, acquires cell voltage and according to cell voltage and SOC
Trends relation curve obtains SOC theoretical assessment.The trends relation curve of cell voltage and SOC, can be in advance to power battery
Dynamic calibration is carried out to obtain this curve, data are obtained by experiment, cell voltage and the trends relation curve of SOC is made.
Since temperature is very big on battery performance influence, the trends relation curve in different temperature environments can be generated.
Obtaining battery theory variation capacity of on-vehicle battery packet during charge or discharge can be there are many method.Example
Such as, the SOC difference for obtaining the first SOC theoretical assessment and the 2nd SOC theoretical assessment, by the absolute value and battery of SOC difference
The product of rated capacity changes capacity as battery theory.For example, battery rated capacity is 100, when being charged, first
SOC theoretical assessment and the 2nd SOC theoretical assessment are respectively that the absolute value of 25%, 75%, SOC difference is 50%, and SOC is poor
The absolute value 50% of value and the product 50 of battery rated capacity 100 change capacity as battery theory.
In one embodiment, setting unit time, unit time can be 1 second etc., and acquisition acquires within the unit time
On-vehicle battery packet current value, using the product of current value and unit time as accumulation of electrical current value.It will be with the charge or discharge phase
Accumulation of electrical current value corresponding to interior each unit time carries out accumulation calculating, obtains battery actual change capacity.
Calculating " current value × unit time of on-vehicle battery packet " is accumulation of electrical current value, and integral is by each list
The position time corresponding " current value × unit time of on-vehicle battery packet ", which is accumulated, arrives battery capacity, and the slight change of electric current can be with body
In the integral calculation of present battery capacity, if the unit time infinitely reduced, the battery capacity infinite approach battery that measures
True capacity.For example, the unit time is 1 second, calculates within every 1 second the product of primary " current value × 1 second of on-vehicle battery packet " and tire out
It is added to battery capacity, obtains battery actual change capacity.
The capacity difference for obtaining battery actual change capacity and battery theory variation capacity, obtains the absolute value of capacity difference
With the capacity ratio of battery rated capacity, the capacity ratio of percentage expression will be used as SOC estimation error value.For example, electric
Pond actual change capacity be 52, battery theory change capacity be 50, battery rated capacity be 100, battery actual change capacity with
The absolute value that battery theory changes the capacity difference of the capacity difference of capacity is 2, the absolute value and the specified appearance of battery of capacity difference
The capacity ratio of amount is 1/50, then SOC estimation error value is 2%.
The determination method of battery system SOC estimation error of the invention, for device measuring battery capacity value can not be used
The case where, it is substituted using theoretical exact value, battery charging and discharging can be carried out after the running test that vehicle completes various road conditions
Process data acquisition.For example, determining that charging (electric discharge) charging that SOC value variable quantity is 50% in the process of on-vehicle battery packet (is put
Electricity) during, and electric current of on-vehicle battery packet during charging (electric discharge) is integrated, calculate the capacity of actual change.
The theoretical capacity changing value that SOC value variable quantity is 50% is calculated, can be obtained based on the capacity of actual change and theoretical capacity changing value
Error existing for SOC estimated value out.
In one embodiment, it is assumed that the SOC that existing SOC estimation policy calculation goes out is accurately to be worth.To Vehicular charging
Charging complete is prompted to vehicle, vehicle is started and carries out road driving, traveling road conditions include high-speed road conditions, Ordinary Rd, rural mountain
The various road conditions such as road.Accumulative (conventional vehicles head protects mileage) after travelling longer than 2500km, by Vehicular charging to being full of, acquires simultaneously
Whether all CAN data of battery system, the SOC estimated value for calculating, analyzing charging process are accurate in charging process.Vehicle
After fully charged, actual road test electric discharge is carried out, the CAN data of all battery systems in discharge process is acquired, is put for analyzing, calculating
Whether the SOC estimated value of electric process is accurate.
For example, calculating the SOC estimation error value of discharge process:
Wherein, Δ SOC is SOC estimation error value, and I is the current value of the on-vehicle battery packet acquired within the unit time, and C is
Battery rated capacity value, Δ t is SOC theoretical assessment by the unit time in 75% to 25% (25% charges to 75%), single
Position is the second；For accumulation of electrical current value corresponding to each unit time during with charge or discharge is accumulated
It calculates.
In one embodiment, Fig. 2 is a reality of the determining device of battery system SOC estimation error according to the present invention
Apply the module diagram of example；The present invention provides a kind of determining device 20 of battery system SOC estimation error, comprising: SOC theoretical value
Obtain module 21, theoretical variation capacity obtains module 22, actual change capacity acquisition module 23 and SOC estimation error determining module
24。
SOC theoretical value obtains module 21 and estimates that strategy obtains on-vehicle battery packet the charge or discharge during according to SOC
First SOC theoretical assessment, the 2nd SOC theoretical assessment.Theory variation capacity obtains module 22 and is based on the first SOC theoretical calculation
The battery rated capacity of value, the 2nd SOC theoretical assessment and on-vehicle battery packet obtains on-vehicle battery packet in the charge or discharge phase
Interior battery theory changes capacity.
Actual change capacity obtains module 23 and acquires the electric current during vehicle-mounted battery pack recharges here or discharges, based on electricity
Stream carries out the battery actual change capacity that integral calculation obtains on-vehicle battery packet.SOC estimation error determining module 24 is based on battery
Actual change capacity and battery theory variation capacity determine SOC estimation error.
In one embodiment, what SOC theoretical value obtained that module 21 obtains preset cell voltage and SOC dynamically associates song
Line acquires the cell voltage of vehicle-mounted battery pack, obtains the first SOC theoretical calculation according to cell voltage and according to curve is dynamically associated
Value and the 2nd SOC theoretical assessment.SOC theoretical value obtains the operating ambient temperature that module 21 acquires on-vehicle battery, acquisition and work
Make that environment temperature is corresponding to dynamically associate curve.Theory variation capacity obtain module 22 obtain the first SOC theoretical assessment with
The SOC difference of 2nd SOC theoretical assessment, using the product of the absolute value of SOC difference and battery rated capacity as battery theory
Change capacity.
When to Vehicular charging, actual change capacity obtains the electric current that module 23 acquires vehicle-mounted battery pack, to obtain electricity
Pond actual change capacity determines the SOC estimation error in charging process.In vehicle travel process, actual change capacity is obtained
Module 23 acquires the electric current of vehicle-mounted battery pack, to obtain battery actual change capacity, determines that the SOC estimation in discharge process misses
Difference.
In one embodiment, actual change capacity obtains the 23 setting unit time of module, and acquisition is adopted within the unit time
The current value of the on-vehicle battery packet of collection, using the product of current value and unit time as accumulation of electrical current value.Actual change capacity obtains
Accumulation of electrical current value corresponding to each unit time during with charge or discharge is carried out accumulation calculating by module 23, obtain
Battery actual change capacity.SOC estimation error determining module 24 obtains battery actual change capacity and battery theory changes capacity
Capacity difference, obtain the absolute value of capacity difference and the capacity ratio of battery rated capacity, will using percentage indicate appearance
Ratio is measured as SOC estimation error value.
In one embodiment, according to a kind of automobile is provided, including the battery system SOC estimation in any embodiment as above
The determining device of error.
In one embodiment, as shown in figure 3, providing a kind of determining device of battery system SOC estimation error, the device
It may include memory 31 and processor 32 and bus 34, for storing instruction, processor 32 is coupled to memory to memory 31
31, processor 32 is configured as realizing above-mentioned battery system SOC estimation error based on the instruction execution that memory 31 stores
Determine method.The device further includes communication interface 33, for carrying out information exchange with other equipment.
Memory 31 can be high speed RAM memory, nonvolatile memory (non-volatile memory) etc., deposit
Reservoir 31 is also possible to memory array.Memory 31 is also possible to by piecemeal, and block can be combined into virtually by certain rule
Volume.Processor 32 can be central processor CPU or application-specific integrated circuit ASIC (Application Specific
Integrated Circuit), or be arranged to implement the determination method of battery system SOC estimation error of the invention
One or more integrated circuits.
In one embodiment, the present invention provides a kind of computer readable storage medium, and computer readable storage medium is deposited
Computer instruction is contained, the battery system SOC estimation error in as above any one embodiment is realized when instruction is executed by processor
Determination method.
The determination method, apparatus and automobile of battery system SOC estimation error provided by the above embodiment are based on vehicle mounted electric
First SOC theoretical assessment, twoth SOC theoretical assessment and battery rated capacity of the Chi Bao during charge or discharge obtain
It obtains battery theory and changes capacity, acquire the electric current during vehicle-mounted battery pack recharges here or discharges and carry out integral calculation acquisition
Battery actual change capacity determines SOC estimation error according to battery actual change capacity and battery theory variation capacity；It can not
Need charging/discharging apparatus and obtain SOC estimation error, can capacity based on actual change and theoretical capacity changing value obtain SOC
Error existing for estimated value, determining SOC estimation error accuracy with higher, and can save the use of charging/discharging apparatus at
This.
Methods and apparatus of the present invention, equipment may be achieved in many ways.For example, software, hardware, firmware can be passed through
Or any combination of software, hardware, firmware realizes methods and apparatus of the present invention, equipment.The step of for method
Sequence is stated merely to be illustrated, the step of method of the invention is not limited to sequence described in detail above, unless with other
Mode illustrates.In addition, in some embodiments, the present invention can be also embodied as recording program in the recording medium, this
A little programs include for realizing machine readable instructions according to the method for the present invention.Thus, the present invention also covers storage for holding
The recording medium of the program of row according to the method for the present invention.
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is to design various embodiments suitable for specific applications with various modifications.
The embodiment provides A1, a kind of determination method of battery system SOC estimation error, wherein includes:
Estimate that strategy obtains first SOC theoretical assessment of on-vehicle battery packet during charge or discharge, the according to SOC
Two SOC theoretical assessments；
Electricity based on the first SOC theoretical assessment, the 2nd SOC theoretical assessment and the on-vehicle battery packet
Pond rated capacity obtains battery theory variation capacity of on-vehicle battery packet during charge or discharge；
The electric current during the on-vehicle battery packet recharges here or discharges is acquired, integral calculation is carried out based on the electric current
Obtain the battery actual change capacity of the on-vehicle battery packet；
SOC estimation error is determined based on the battery actual change capacity and battery theory variation capacity.
A2, method as described in a1, wherein described to estimate that strategy obtains on-vehicle battery packet in charge or discharge according to SOC
The first SOC theoretical assessment, the 2nd SOC theoretical assessment in the process include:
Obtain preset cell voltage and SOC dynamically associates curve；
The cell voltage for acquiring the on-vehicle battery packet is obtained according to the cell voltage and according to the curve that dynamically associates
To the first SOC theoretical assessment and the 2nd SOC theoretical assessment.
A3, as described in A2 method, wherein further include:
The operating ambient temperature of the on-vehicle battery is acquired, the dynamic corresponding with the operating ambient temperature is obtained
Invariance curve.
A4, as described in A2 method, wherein the battery for obtaining the on-vehicle battery packet during charge or discharge
Theory changes capacity
Obtain the SOC difference of the first SOC theoretical assessment and the 2nd SOC theoretical assessment；
The product of the absolute value of the SOC difference and the battery rated capacity is changed as the battery theory and is held
Amount.
A5, the method as described in A4, wherein described that the integral calculation acquisition on-vehicle battery packet is carried out based on the electric current
Battery actual change capacity include:
The setting unit time obtains the current value of the on-vehicle battery packet acquired within the unit time；
Using the product of the current value and the unit time as accumulation of electrical current value；
Accumulation of electrical current value corresponding to each unit time during with the charge or discharge is subjected to accumulation calculating,
Obtain the battery actual change capacity.
A6, method as described in a5, wherein described to be changed based on the battery actual change capacity and the battery theory
Capacity determines that SOC estimation error includes:
Obtain the capacity difference of the battery actual change capacity and battery theory variation capacity；
The absolute value of the capacity difference and the capacity ratio of the battery rated capacity are obtained, will be indicated using percentage
The capacity ratio as SOC estimation error value.
A7, method as described in a1, wherein
When to Vehicular charging, the electric current of the on-vehicle battery packet is acquired, to obtain the battery actual change capacity,
Determine the SOC estimation error in charging process；
In vehicle travel process, the electric current of the on-vehicle battery packet is acquired, is held to obtain the battery actual change
Amount, determines the SOC estimation error in discharge process.
B8, a kind of determining device of battery system SOC estimation error, wherein include:
SOC theoretical value obtains module, for estimating that strategy obtains on-vehicle battery packet during charge or discharge according to SOC
The first SOC theoretical assessment, the 2nd SOC theoretical assessment；
Theory variation capacity obtains module, for being estimated based on the first SOC theoretical assessment, the 2nd SOC theory
Calculation value and the battery rated capacity of the on-vehicle battery packet obtain electricity of on-vehicle battery packet during charge or discharge
Pond theory changes capacity；
Actual change capacity obtains module, for acquiring the electricity during the on-vehicle battery packet recharges here or discharges
Stream carries out the battery actual change capacity that integral calculation obtains the on-vehicle battery packet based on the electric current；
SOC estimation error determining module, for being held based on the battery actual change capacity and battery theory variation
It measures and determines SOC estimation error.
B9, the device as described in B8, wherein
The SOC theoretical value obtains module, dynamically associates curve for obtain preset cell voltage and SOC；Acquisition
The cell voltage of the on-vehicle battery packet obtains described first according to the cell voltage and according to the curve that dynamically associates
SOC theoretical assessment and the 2nd SOC theoretical assessment.
B10, the device as described in B9, wherein
The SOC theoretical value obtains module, for acquiring the operating ambient temperature of the on-vehicle battery, obtains and the work
Make that environment temperature is corresponding described to dynamically associate curve.
B11, the device as described in B9, wherein
The theoretical variation capacity obtains module, manages for obtaining the first SOC theoretical assessment and the 2nd SOC
By the SOC difference of estimated value；The product of the absolute value of the SOC difference and the battery rated capacity is managed as the battery
By variation capacity.
B12, device as described in b11, wherein
The actual change capacity obtains module, is used for the setting unit time, what acquisition acquired within the unit time
The current value of the on-vehicle battery packet；Using the product of the current value and the unit time as accumulation of electrical current value；Will with institute
It states accumulation of electrical current value corresponding to each unit time during charge or discharge and carries out accumulation calculating, it is real to obtain the battery
Border changes capacity.
B13, as described in B12 device, wherein
The SOC estimation error determining module becomes for obtaining the battery actual change capacity and the battery theory
Change the capacity difference of capacity；The absolute value of the capacity difference and the capacity ratio of the battery rated capacity are obtained, will be used
The capacity ratio that percentage indicates is as SOC estimation error value.
B14, the device as described in B9, wherein
The actual change capacity obtains module, for acquiring the electric current of the on-vehicle battery packet when to Vehicular charging,
To obtain the battery actual change capacity, the SOC estimation error in charging process is determined；In vehicle travel process
In, the electric current of the on-vehicle battery packet is acquired, to obtain the battery actual change capacity, determines the SOC in discharge process
Estimation error.
C15, a kind of automobile, wherein include:
Such as the determining device of the described in any item battery system SOC estimation errors of B8 to B14.
D16, a kind of determining device of battery system SOC estimation error, wherein include:
Memory；And it is coupled to the processor of the memory, the processor is configured to described based on being stored in
Instruction in memory executes the method as described in any one of A1 to A7.
E17, a kind of computer readable storage medium, are stored thereon with computer program instructions, and the instruction is by one or more
The step of method described in any one of A1 to A7 is realized when a processor executes.
Claims (10)
1. a kind of determination method of battery system SOC estimation error characterized by comprising
Tactful the first SOC theoretical assessment for obtaining on-vehicle battery packet during charge or discharge, second are estimated according to SOC
SOC theoretical assessment；
Battery volume based on the first SOC theoretical assessment, the 2nd SOC theoretical assessment and the on-vehicle battery packet
Constant volume obtains battery theory variation capacity of on-vehicle battery packet during charge or discharge；
The electric current during the on-vehicle battery packet recharges here or discharges is acquired, integral calculation acquisition is carried out based on the electric current
The battery actual change capacity of the on-vehicle battery packet；
SOC estimation error is determined based on the battery actual change capacity and battery theory variation capacity.
2. the method as described in claim 1, which is characterized in that described to estimate that strategy obtains on-vehicle battery packet and filling according to SOC
Electricity or the first SOC theoretical assessment in discharge process, the 2nd SOC theoretical assessment include:
Obtain preset cell voltage and SOC dynamically associates curve；
The cell voltage for acquiring the on-vehicle battery packet obtains institute according to the cell voltage and according to the curve that dynamically associates
State the first SOC theoretical assessment and the 2nd SOC theoretical assessment.
3. method according to claim 2, which is characterized in that further include:
Acquire the operating ambient temperature of the on-vehicle battery, obtain it is corresponding with the operating ambient temperature described in dynamically associate
Curve.
4. method according to claim 2, which is characterized in that described to obtain the on-vehicle battery packet during charge or discharge
Interior battery theory changes capacity
Obtain the SOC difference of the first SOC theoretical assessment and the 2nd SOC theoretical assessment；
Change capacity for the product of the absolute value of the SOC difference and the battery rated capacity as the battery theory.
5. a kind of determining device of battery system SOC estimation error characterized by comprising
SOC theoretical value obtains module, for estimating that strategy obtains the of on-vehicle battery packet during charge or discharge according to SOC
One SOC theoretical assessment, the 2nd SOC theoretical assessment；
Theory variation capacity obtains module, for being based on the first SOC theoretical assessment, the 2nd SOC theoretical assessment
And the battery rated capacity of the on-vehicle battery packet obtains battery reason of on-vehicle battery packet during charge or discharge
By variation capacity；
Actual change capacity obtains module, for acquiring the electric current during the on-vehicle battery packet recharges here or discharges, base
The battery actual change capacity that integral calculation obtains the on-vehicle battery packet is carried out in the electric current；
SOC estimation error determining module, for true based on the battery actual change capacity and battery theory variation capacity
Determine SOC estimation error.
6. device as claimed in claim 5, which is characterized in that
The SOC theoretical value obtains module, dynamically associates curve for obtain preset cell voltage and SOC；Described in acquisition
The cell voltage of on-vehicle battery packet obtains the first SOC reason according to the cell voltage and according to the curve that dynamically associates
By estimated value and the 2nd SOC theoretical assessment.
7. device as claimed in claim 6, which is characterized in that
The SOC theoretical value obtains module, for acquiring the operating ambient temperature of the on-vehicle battery, obtains and the building ring
Curve is dynamically associated described in border temperature is corresponding.
8. a kind of automobile characterized by comprising
Such as the determining device of the described in any item battery system SOC estimation errors of claim 5 to 7.
9. a kind of determining device of battery system SOC estimation error characterized by comprising
Memory；And it is coupled to the processor of the memory, the processor is configured to based on the storage is stored in
Instruction in device executes method according to any one of claims 1 to 4.
10. a kind of computer readable storage medium, is stored thereon with computer program instructions, which is handled by one or more
The step of method described in any one of Claims 1-4 is realized when device executes.
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| CN110988721A (en) * | 2019-11-25 | 2020-04-10 | 安徽绿沃循环能源科技有限公司 | SOC precision detection method for lithium battery pack software protection board |
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