CN104833918A - Method for detection of service life of power battery of vehicle, and system - Google Patents
Method for detection of service life of power battery of vehicle, and system Download PDFInfo
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Abstract
The invention provides a method for detection of the service life of a power battery of a vehicle, and a system. The method comprises obtaining vehicle test data which comprises charging/discharging current curves of the power battery in a preset time, performing charging/discharging cycle tests on the power battery by utilizing charging/discharging currents corresponding to the charging/discharging current curves, recording the residual capacity of the power battery when a preset cycle number is reached, obtaining the service life decay rate of the power battery in the charging/discharging processes of the preset cycle number according to the residual capacity, and calculating a residual using time of the power battery from an SOH of the power battery reduces to a preset SOH according to the life decay rate. According to the embodiment of the invention, the method for detection of the service life of the power battery of the vehicle has the advantages of high detection efficiency and accurate service life detection of the power battery.
Description
Technical field
The present invention relates to battery life detection technique field, particularly a kind of detection method and system in serviceable life of the electrokinetic cell for vehicle.
Background technology
At present along with energy crisis and environmental problem, the development of the new-energy automobile such as electric automobile, hybrid vehicle rapidly.The cycle life of the automobile-used high-tension battery bag (i.e. electrokinetic cell) of new-energy automobile seems highly seasoned wanting, for the calculating in the serviceable life of electrokinetic cell, and can only according to corporate specification and some international standards.The energy-type cells bag method of testing such as, specified in ISO12405-2, the inapplicable all battery products of test condition wherein (wherein test environment is harsh, test charge-discharge magnification is larger), such as, there is impact to the life-span of electrokinetic cell in the temperature etc. of electrokinetic cell charge/discharge current, electrokinetic cell.Therefore, in the serviceable life of the electrokinetic cell that the method for testing on existing standard obtains, truly, reliably can not reflect electrokinetic cell real serviceable life, also just cannot obtain electrokinetic cell continual mileage that is true when end-of-life, vehicle reliably.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, one object of the present invention is the detection method in serviceable life proposing a kind of electrokinetic cell for vehicle.The method has that detection efficiency is high, electrokinetic cell detects advantage accurately serviceable life.
Another object of the present invention is to the detection system in serviceable life proposing a kind of electrokinetic cell for vehicle.
To achieve these goals, the embodiment of a first aspect of the present invention discloses a kind of detection method in serviceable life of the electrokinetic cell for vehicle, comprise the following steps: obtain vehicle testing data, described vehicle testing data comprise the charge/discharge current curve of the described electrokinetic cell in Preset Time; With charge/discharge current corresponding to the charge/discharge current curve of described electrokinetic cell, electrokinetic cell is carried out to the loop test of charge/discharge, and when the number of times of described loop test reaches preset loop number of times, record the residual capacity of described electrokinetic cell; The life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times is obtained according to the residual capacity of described electrokinetic cell; And residue service time of described electrokinetic cell when dropping to default SOH according to the degradation SOH that described life time decay rate calculates described electrokinetic cell.
According to the detection method in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, according to the charge/discharge current of electrokinetic cell real in vehicle testing data the charge-discharge test of preset loop number of times carried out to electrokinetic cell and obtain the life time decay rate of electrokinetic cell, therefore, for different vehicles, life time decay rate is different, the life time decay rate of electrokinetic cell in different vehicle can be reflected true and reliablely, and then, the residue calculating electrokinetic cell according to this life time decay rate is more accurate for service time, the serviceable life that battery is respective in different vehicle can be embodied.Therefore, the serviceable life that the method has an electrokinetic cell detects advantage accurately and reliably.In addition, the method only need carry out relatively less loop test to electrokinetic cell, has the advantage that detection efficiency is high.
In addition, the detection method in serviceable life of the electrokinetic cell for vehicle according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, described vehicle testing data also comprise: the speed curves in described Preset Time, after obtaining residue service time of described electrokinetic cell, also comprise: the continual mileage of described vehicle in residue service time that the speed of a motor vehicle corresponding according to described speed curves obtains described electrokinetic cell.
In some instances, utilize following formula to obtain the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, wherein, described formula is: Capacity=Exp (-λ * Cycles), wherein, Capacity is the residual capacity of described electrokinetic cell, and described λ is described life time decay rate, described Cycles is preset loop number of times, and described Exp () is exponential function.
In some instances, described preset loop number of times is positioned between [15,60], and described default SOH is 80%.
In some instances, described vehicle testing data are test under actual operating mode according to described vehicle to obtain.
The embodiment of a second aspect of the present invention discloses a kind of detection system in serviceable life of the electrokinetic cell for vehicle, comprise: acquisition module, for obtaining vehicle testing data, described vehicle testing data comprise the charge/discharge current curve of the described electrokinetic cell in Preset Time; Test module, for charge/discharge current corresponding to the charge/discharge current curve with described electrokinetic cell, electrokinetic cell is carried out to the loop test of charge/discharge, and when the number of times of described loop test reaches preset loop number of times, record the residual capacity of described electrokinetic cell; Computing module, for obtaining the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, and residue service time of described electrokinetic cell when dropping to default SOH according to the degradation SOH that described life time decay rate calculates described electrokinetic cell.
According to the detection system in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, according to the charge/discharge current of electrokinetic cell real in vehicle testing data the charge-discharge test of preset loop number of times carried out to electrokinetic cell and obtain the life time decay rate of electrokinetic cell, therefore, for different vehicles, life time decay rate is different, the life time decay rate of electrokinetic cell in different vehicle can be reflected true and reliablely, and then, the residue calculating electrokinetic cell according to this life time decay rate is more accurate for service time, the serviceable life that battery is respective in different vehicle can be embodied.Therefore, the serviceable life that this system has an electrokinetic cell detects advantage accurately and reliably.In addition, this system only need carry out relatively less loop test to electrokinetic cell, has the advantage that detection efficiency is high.
In addition, the detection system in serviceable life of the electrokinetic cell for vehicle according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, described vehicle testing data also comprise: the speed curves in described Preset Time, after obtaining residue service time of described electrokinetic cell, the continual mileage of described vehicle in described computing module also obtains described electrokinetic cell residue service time for the speed of a motor vehicle corresponding according to described speed curves.
In some instances, described computing module utilizes following formula to obtain the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, wherein, described formula is: Capacity=Exp (-λ * Cycles), wherein, Capacity is the residual capacity of described electrokinetic cell, and described λ is described life time decay rate, described Cycles is preset loop number of times, and described Exp () is exponential function.
In some instances, described preset loop number of times is positioned between [15,60], and described default SOH is 80%.
In some instances, described vehicle testing data are test under actual operating mode according to described vehicle to obtain.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 be according to an embodiment of the invention for vehicle electrokinetic cell serviceable life detection method process flow diagram;
Fig. 2 be according to an embodiment of the invention for the electrokinetic cell of vehicle serviceable life the vehicle testing data in detection method schematic diagram; And
Fig. 3 be according to an embodiment of the invention for vehicle electrokinetic cell serviceable life detection system structured flowchart.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Below in conjunction with accompanying drawing, the detection method and system in serviceable life according to the electrokinetic cell for vehicle of the embodiment of the present invention is described.
Fig. 1 be according to an embodiment of the invention for vehicle electrokinetic cell serviceable life detection method process flow diagram.As shown in Figure 1, according to an embodiment of the invention for the detection method in serviceable life of the electrokinetic cell of vehicle, comprise the steps:
Step S101: obtain vehicle testing data, vehicle testing data include but not limited to the charge/discharge current curve of the electrokinetic cell in Preset Time.Wherein, vehicle is such as electric automobile, hybrid vehicle etc., the driving force that electrokinetic cell can be electric automobile, hybrid vehicle provides traveling.
Wherein, vehicle testing data such as obtain for testing under actual operating mode according to vehicle.As shown in Figure 2, the vehicle testing data that a certain vehicle detects under the operating mode of city are shown.Wherein, in Fig. 2, horizontal ordinate is the time, ordinate comprises the charge/discharge current of electrokinetic cell, as the charge/discharge current curve 1 of 195 seconds (i.e. Preset Time) internally-powered batteries.
Be understandable that, the charge/discharge current curve of the electrokinetic cell obtained by the way more adequately can reflect the charge/discharge situation of vehicle electrokinetic cell under daily actual operating mode.
Step S102: the loop test with charge/discharge current corresponding to the charge/discharge current curve of electrokinetic cell, electrokinetic cell being carried out to charge/discharge, and when the number of times of loop test reaches preset loop number of times, the residual capacity of record electrokinetic cell.
Such as: the charge/discharge current that the charge/discharge current curve of the electrokinetic cell obtained by above-mentioned measurement is corresponding carries out 25 charge/discharge cycle to electrokinetic cell, and the residual capacity that at the end of being recorded in loop test, electrokinetic cell is current, as the residual capacity of electrokinetic cell can be reflected by state-of-charge SOC.It should be noted that, preset loop number of times is not limited to 25 times, as being positioned between [15,60], certainly, the cycle index of 15 to 60 times is also only exemplary, concrete preset loop number of times can be changed as required, and its principle is that the setting of preset loop number of times is not easily excessive or too small, crosses the loop test overlong time that senior general causes electrokinetic cell, affect the efficiency of the method, too small, affect the measuring accuracy of the method.
Step S103: obtain the life time decay rate of electrokinetic cell in the charge/discharge process of preset loop number of times according to the residual capacity of electrokinetic cell.
Such as: following formulae discovery can be utilized to obtain electrokinetic cell life time decay rate, the parameter such as residual capacity by electrokinetic cell substitutes into following formula and obtains electrokinetic cell life time decay rate, and wherein, this formula is:
Capacity＝Exp(-λ*Cycles)；
Wherein, Capacity is the residual capacity of electrokinetic cell, and λ is the life time decay rate of electrokinetic cell, and Cycles is preset loop number of times (as 25 times), and Exp () is exponential function.
The process solved above-mentioned formula Capacity=Exp (-λ * Cycles) is as follows:
The life time decay rate λ of battery is usually smaller, such as λ=0.000xxx, as 0.000269, so exponential formula is approximately:
Capacity＝1-λ*Cycles；
That is:
Simplify it, Y=Exp (X)=1+X, wherein X=λ * Cycles.
Then, Excel function can be utilized to calculate λ, specifically:
By LN (x), its natural logarithm is calculated to x.
OFFSET (reference position, row offset value, column offset value, height value, width value)=output array
LINEST (Y value array, whether X value array, force intercept b=0, whether returns slope and intercept)
Calculate the composite function formula of λ:
LINEST(LN(OFFSET(B11,,,COUNT(B11:B505))),OFFSET($A$11,,,COUNT(B11:B505)))；
Wherein: B11 is first position of the row of residual capacity, calculates the number of nonzero value in residual capacity array with Count (B11:B505).With function LN (), residual capacity numerical value is taken the logarithm.
Step S104: the residue service time calculating electrokinetic cell when the degradation SOH of electrokinetic cell drops to default SOH according to life time decay rate.
Wherein, when the SOH of electrokinetic cell drops to this default SOH, think that this electrokinetic cell reaches guideline lives, can not use again.Such as: preset SOH and be but be not limited to 80%.Therefore, after knowing the life time decay rate of electrokinetic cell, according to the current SOC of electrokinetic cell and default SOH, the residue service time of electrokinetic cell can be calculated.
According to the detection method in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, according to the charge/discharge current of electrokinetic cell real in vehicle testing data the charge-discharge test of preset loop number of times carried out to electrokinetic cell and obtain the life time decay rate of electrokinetic cell, therefore, for different vehicles, life time decay rate is different, the life time decay rate of electrokinetic cell in different vehicle can be reflected true and reliablely, and then, the residue calculating electrokinetic cell according to this life time decay rate is more accurate for service time, the serviceable life that battery is respective in different vehicle can be embodied.Therefore, the serviceable life that the method has an electrokinetic cell detects advantage accurately and reliably.In addition, the method only need carry out relatively less loop test to electrokinetic cell, has the advantage that detection efficiency is high.
Shown in composition graphs 2, in one embodiment of the invention, vehicle testing data also can comprise: the speed curves 2 in Preset Time, and then, after obtaining residue service time of electrokinetic cell, the method also can the speed of a motor vehicle corresponding according to speed curves obtain electrokinetic cell residue service time in the continual mileage of vehicle.This continual mileage is more true, reliable.Composition graphs 2 again, according to different needs, vehicle testing data also can comprise powertrace 3 and the voltage curve 4 of electrokinetic cell.
According to the detection method in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, there is detection efficiency high, electrokinetic cell life tests advantage accurately.
Fig. 3 be according to an embodiment of the invention for vehicle electrokinetic cell serviceable life detection system structured flowchart.As shown in Figure 3, this is used for the detection system 300 in serviceable life of the electrokinetic cell of vehicle, comprising: acquisition module 310, test module 320 and computing module 330.
Wherein, acquisition module 310 is for obtaining vehicle testing data, and vehicle testing data comprise the charge/discharge current curve of the electrokinetic cell in Preset Time, and wherein, vehicle testing data are test under actual operating mode according to described vehicle to obtain.Test module 320 carries out the loop test of charge/discharge to electrokinetic cell for charge/discharge current corresponding to the charge/discharge current curve with electrokinetic cell, and when the number of times of loop test reaches preset loop number of times, the residual capacity of record electrokinetic cell, such as: preset loop number of times is positioned at but is not limited between [15,60].Computing module 330 for obtaining the life time decay rate of electrokinetic cell in the charge/discharge process of preset loop number of times according to the residual capacity of electrokinetic cell, and calculates the residue service time of electrokinetic cell when the degradation SOH of electrokinetic cell drops to default SOH according to life time decay rate.Such as: preset SOH and be but be not limited to 80%.
In one embodiment of the invention, computing module 330 can utilize following formula to obtain the life time decay rate of electrokinetic cell in the charge/discharge process of preset loop number of times according to the residual capacity of electrokinetic cell, wherein, this formula is: Capacity=Exp (-λ * Cycles), wherein, Capacity is the residual capacity of electrokinetic cell, and λ is described life time decay rate, Cycles is preset loop number of times, and Exp () is exponential function.
According to the detection system in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, according to the charge/discharge current of electrokinetic cell real in vehicle testing data the charge-discharge test of preset loop number of times carried out to electrokinetic cell and obtain the life time decay rate of electrokinetic cell, therefore, for different vehicles, life time decay rate is different, the life time decay rate of electrokinetic cell in different vehicle can be reflected true and reliablely, and then, the residue calculating electrokinetic cell according to this life time decay rate is more accurate for service time, the serviceable life that battery is respective in different vehicle can be embodied.Therefore, the serviceable life that this system has an electrokinetic cell detects advantage accurately and reliably.In addition, this system only need carry out relatively less loop test to electrokinetic cell, has the advantage that detection efficiency is high.
In one embodiment of the invention, vehicle testing data also comprise: the speed curves in Preset Time.Therefore, after obtaining residue service time of electrokinetic cell, computing module 330 also can the speed of a motor vehicle corresponding according to speed curves obtain electrokinetic cell residue service time in the continual mileage of vehicle.This continual mileage is more true, reliable.
It should be noted that, the specific implementation of the system of the embodiment of the present invention refers to the description of method part, in order to reduce redundancy, does not repeat.
According to the detection system in serviceable life of the electrokinetic cell for vehicle of the embodiment of the present invention, there is detection efficiency high, electrokinetic cell life tests advantage accurately.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalency thereof.
Claims (10)
1., for a detection method in serviceable life for the electrokinetic cell of vehicle, it is characterized in that, comprise the following steps:
Obtain vehicle testing data, described vehicle testing data comprise the charge/discharge current curve of the described electrokinetic cell in Preset Time;
With charge/discharge current corresponding to the charge/discharge current curve of described electrokinetic cell, electrokinetic cell is carried out to the loop test of charge/discharge, and when the number of times of described loop test reaches preset loop number of times, record the residual capacity of described electrokinetic cell;
The life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times is obtained according to the residual capacity of described electrokinetic cell; And
The residue service time of described electrokinetic cell when the degradation SOH calculating described electrokinetic cell according to described life time decay rate drops to default SOH.
2. the detection method in serviceable life of the electrokinetic cell for vehicle according to claim 1, is characterized in that, described vehicle testing data also comprise: the speed curves in described Preset Time,
After obtaining residue service time of described electrokinetic cell, also comprise:
The continual mileage of described vehicle in residue service time that the speed of a motor vehicle corresponding according to described speed curves obtains described electrokinetic cell.
3. the detection method in serviceable life of the electrokinetic cell for vehicle according to claim 1, it is characterized in that, utilize following formula to obtain the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, wherein, described formula is: Capacity=Exp (-λ * Cycles)
Wherein, Capacity is the residual capacity of described electrokinetic cell, and described λ is described life time decay rate, and described Cycles is preset loop number of times, and described Exp () is exponential function.
4. the detection method in serviceable life of the electrokinetic cell for vehicle according to claim 1, is characterized in that, described preset loop number of times is positioned between [15,60], and described default SOH is 80%.
5. the detection method in serviceable life of the electrokinetic cell for vehicle according to any one of claim 1-4, is characterized in that, described vehicle testing data are test under actual operating mode according to described vehicle to obtain.
6., for a detection system in serviceable life for the electrokinetic cell of vehicle, it is characterized in that, comprising:
Acquisition module, for obtaining vehicle testing data, described vehicle testing data comprise the charge/discharge current curve of the described electrokinetic cell in Preset Time;
Test module, for charge/discharge current corresponding to the charge/discharge current curve with described electrokinetic cell, electrokinetic cell is carried out to the loop test of charge/discharge, and when the number of times of described loop test reaches preset loop number of times, record the residual capacity of described electrokinetic cell;
Computing module, for obtaining the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, and residue service time of described electrokinetic cell when dropping to default SOH according to the degradation SOH that described life time decay rate calculates described electrokinetic cell.
7. the detection system in serviceable life of the electrokinetic cell for vehicle according to claim 6, is characterized in that, described vehicle testing data also comprise: the speed curves in described Preset Time,
After obtaining residue service time of described electrokinetic cell, the continual mileage of described vehicle in described computing module also obtains described electrokinetic cell residue service time for the speed of a motor vehicle corresponding according to described speed curves.
8. the detection system in serviceable life of the electrokinetic cell for vehicle according to claim 6, it is characterized in that, described computing module utilizes following formula to obtain the life time decay rate of described electrokinetic cell in the charge/discharge process of described preset loop number of times according to the residual capacity of described electrokinetic cell, wherein, described formula is: Capacity=Exp (-λ * Cycles)
Wherein, Capacity is the residual capacity of described electrokinetic cell, and described λ is described life time decay rate, and described Cycles is preset loop number of times, and described Exp () is exponential function.
9. the detection system in serviceable life of the electrokinetic cell for vehicle according to claim 6, is characterized in that, described preset loop number of times is positioned between [15,60], and described default SOH is 80%.
10. the detection system in serviceable life of the electrokinetic cell for vehicle according to any one of claim 6-9, is characterized in that, described vehicle testing data are test under actual operating mode according to described vehicle to obtain.
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