CN105372594A - Method of estimating vehicle-used power battery state of health (SOH) value and device - Google Patents
Method of estimating vehicle-used power battery state of health (SOH) value and device Download PDFInfo
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- CN105372594A CN105372594A CN201410421011.7A CN201410421011A CN105372594A CN 105372594 A CN105372594 A CN 105372594A CN 201410421011 A CN201410421011 A CN 201410421011A CN 105372594 A CN105372594 A CN 105372594A
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- 230000003862 health status Effects 0.000 claims description 16
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- 238000012360 testing method Methods 0.000 description 9
- 239000011449 brick Substances 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
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Abstract
The invention provides a method of estimating a vehicle-used power battery state of health (SOH) value and a device. The method comprises steps: S1, according to estimated capacity and temperature when the power battery completes charging, equivalent capacity of the power battery is calculated; S2, whether the calculated equivalent capacity is smaller than stored equivalent capacity is judged; S3, when the calculated equivalent capacity is smaller than the stored equivalent capacity, whether the difference value between the two is larger than a first threshold is judged; S4, when the difference value is larger than the first threshold, the first value is subtracted from the current SOH value of the power battery. Through calculating the equivalent capacity in the actual driving process, the equivalent capacity is compared with the stored equivalent capacity, whether the difference value exceeds the set first threshold is judged, the SOH value is processed according to a judgment result, and the SOH of the power battery can be estimated simply and relatively accurately.
Description
Technical field
The present invention relates to new-energy automobile field, particularly relate to a kind of method and the device of estimating Vehicular dynamic battery health status numerical value.
Background technology
The health status (StateofHealth is called for short SOH) of electrokinetic cell, for defining the size of the electricity storage capacity of battery.The electricity (i.e. capacity) that battery can store and charging and discharging capabilities (i.e. power), along with the use of battery can decay, until can not meet user demand.Usually, its battery capacity more paid close attention to by the battery that pure electric vehicle or pure electrically driven (operated) plug-in hybrid electric vehicle use, and therefore, also usually investigates with the decay of its battery capacity or reflects health status.Usual definition when battery capacity decays to initial 80% time, namely assert end-of-life.
Existing SOH numerical estimation method sets up a complicated mathematical model, and by detecting the electrology characteristic in battery use procedure, input model, calculates the internal resistance of cell thus, then thus calculate the capacity of battery, and the health status of the battery that converts.
But, set up an accurate mathematical model very difficult, and very complicated:
One, needs based on test data that is a large amount of, laboratory cells for a long time, the particularly test data of Life Cycle.But the operating mode difference that laboratory is tested time the lifetime data obtained is driven a vehicle with reality again on temperature, applying working condition is very large, and the electrochemical properties of battery is subject to the impact of a lot of condition element, and the error of estimation is not little yet.
Its two, the foundation of model based on the attenuation characteristic of test data normally battery cell.And power brick is the connection in series-parallel of multiple monomer usually, its life-span or capacity fade characteristics are also associated with the inconsistency between monomer, thus, introduce error to again the appraising model set up, namely use with reality and there are differences.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of method and the device of estimating Vehicular dynamic battery health status numerical value quickly and accurately.
In order to solve the problems of the technologies described above, the invention provides a kind of method estimating Vehicular dynamic battery health status numerical value, comprising:
Step S1, the pressure,volume and temperature estimated when completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
Step S2, judges whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Step S3, when the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Step S4, when described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
Wherein, described step S1 specifically comprises:
Step S11, judges whether described electrokinetic cell completes charging;
Step S12, when described electrokinetic cell completes charging, the pressure,volume and temperature of input estimation;
Step S13, according to the pressure,volume and temperature of described estimation, calculates the equivalent capacity of described electrokinetic cell.
Wherein, also comprise before described step S2:
Step S20, the equivalent capacity that input stores.
Wherein, also comprise after described step S2:
Step S21, when the equivalent capacity of described calculating is greater than the equivalent capacity of described storage, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage.
Wherein, while the described step S4 of execution, also comprise and perform step S40, when described difference is greater than first threshold, the equivalent capacity of described storage is updated to the equivalent capacity of described calculating.
Wherein, described step S20 also comprises: the SOH counting that input stores, and the initial value of described SOH counting is 0.
Wherein, described step S4 specifically comprises:
Step S41, when described difference is greater than first threshold, adds 1 by the SOH of described storage counting and obtains new SOH and count, otherwise is then counted by the SOH of described storage and make zero;
Step S42, judges whether described new SOH counting is greater than Second Threshold;
Step S43, when described new SOH counting is greater than described Second Threshold, the following step of executed in parallel:
Step S431, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage;
Step S432, deducts described first numerical value by described electrokinetic cell current health state SOH numerical value;
Step S433, by described new SOH counting zero.
Wherein, described method also comprises:
The SOH count update of described storage, when described SOH counting is less than or equal to described Second Threshold, is described new SOH counting by step S34.
The present invention also provides a kind of device estimating Vehicular dynamic battery health status numerical value, comprising:
Computing unit, the pressure,volume and temperature estimated during for completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
First judging unit, for judging whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Second judging unit, for when described first judging unit judges that the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Processing unit, for when described second judging unit judges that described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
Implement the embodiment of the present invention and will bring following beneficial effect: by calculating equivalent capacity in actual driving conditions, and compare with the equivalent capacity stored, judge whether difference exceedes the first threshold of setting, according to judged result, SOH numerical value is processed, the succinct and relatively accurate life-span estimating electrokinetic cell; Do not need to design complicated model and in earlier stage a large amount of test figures, SOH estimation is the characteristic considering inconsistency between battery cell in power brick, namely considers the whole volume decay of power brick, and not only considers the capacity attenuation of battery cell; The present invention can in the pure electric drive class vehicle of extrapolating electricity, relatively fast, the relatively accurate estimation function enabling cell health state.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet that the embodiment of the present invention one estimates the method for Vehicular dynamic battery health status numerical value.
Fig. 2 is the another schematic flow sheet that the embodiment of the present invention one estimates the method for Vehicular dynamic battery health status numerical value.
Fig. 3 is the structural representation that the embodiment of the present invention two estimates the device of Vehicular dynamic battery health status numerical value.
Embodiment
Below with reference to the accompanying drawings the preferred embodiments of the present invention are described.
Please refer to shown in Fig. 1, the embodiment of the present invention one provides a kind of method estimating Vehicular dynamic battery health status numerical value, comprising:
Step S1, the pressure,volume and temperature estimated when completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
Step S2, judges whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Step S3, when the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Step S4, when described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
Simultaneously shown in composition graphs 2, please be specifically described each step below.
Step S1 specifically comprises:
Step S11, judges whether described electrokinetic cell completes charging;
Step S12, when described electrokinetic cell completes charging, the pressure,volume and temperature of input estimation;
Step S13, according to the pressure,volume and temperature of described estimation, calculates the equivalent capacity of described electrokinetic cell.
" when electrokinetic cell completes charging " refers to the state forwarding charging end from charging to, instead of refers to complete the always static state of charging.Only under the state of the firm end of charging, the across comparison between estimated capacity and temperature just have repeatedly.The estimation of capacity can gather the parameter such as voltage, electric current, temperature of electrokinetic cell, is calculated get by software.As for the estimation of temperature, then direct by the temperature sensor collecting test in power brick.
Calculate the impact of temperature in the removal capacity comparison procedure of equivalent capacity fundamental purpose, under different temperatures, capacity is discrepant, if difference is not eliminated, then has no way of comparing.By some experimental datas, obtain a relational expression of temperature, capacity, life time decay, test figure is more, and this relational expression is more accurate.When practical operation, the temperature that input is actual and capacity can calculate the capacity of equivalence.
Also step S20 is comprised, the equivalent capacity that input stores before step S2.If first time estimation, then the equivalent capacity of input step S1 calculating.
In general, along with the use of electrokinetic cell, the increase of charge and discharge cycles, capacity can be decayed gradually, therefore, the equivalent capacity of described calculating should be less than the equivalent capacity of storage usually, if not so, then mean that abnormal (error that may be such as volume calculation in step S1 is too large) has appearred in some aspect, step S2 judges the magnitude relationship between the equivalent capacity of calculating and the equivalent capacity of storage, just performs subsequent step S3, S4 when only having the equivalent capacity of calculating to be less than the equivalent capacity of described storage.Correspondingly, more accurate in order to estimate next time, also comprise after step S2:
Step S21, when the equivalent capacity of described calculating is greater than the equivalent capacity of described storage, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage.
In step S3, if the equivalent capacity of described calculating is Q
calculate, the equivalent capacity of described storage is Q
store, the two difference is D, then have D=(Q
store-Q
calculate)/Q
store, the equivalent capacity Q also namely calculated
calculatecompared to the equivalent capacity Q stored
storereducing D(D is percentage).Then the first threshold of D and setting is compared.
Step S4 is the step performed according to the comparative result of step S3, and wherein first threshold and the first numerical value are relevant copulas.If the cut-off of definition electrokinetic cell life-span is its capacity be reduced to initial 80%, then to set first threshold be the 1%, first numerical value is 5%, that is, when the equivalent capacity of described calculating and the equivalent capacity difference of storage add up to reduce 20% time, SOH is just accumulative has deducted 100%, becomes 0.In like manner, if the cut-off of definition electrokinetic cell life-span is the capacity of 70%, then corresponding first threshold and the first numerical value all need to change.In addition, though equally when define the cut-off of electrokinetic cell life-span be its capacity be reduced to initial 80%, first threshold and the first numerical value are also not limited to above-mentioned value, and such as, first threshold can be the 2%, first numerical value is 10%.
While execution step S4, also comprise and perform step S40, when described difference is greater than first threshold, the equivalent capacity of described storage is updated to the equivalent capacity of described calculating.After step S3 performs, if the difference of the equivalent capacity of described calculating and the equivalent capacity of storage is greater than first threshold, show compared with the equivalent capacity of former storage, the equivalent capacity calculated decays, more accurate in order to estimate next time, need the equivalent capacity be used for as the storage of comparison basis to upgrade.
In order to reduce because certain volume calculation error once, and the false judgment capacity attenuation that the reason of equilibrium causes, be provided with SOH counting and corresponding judgment threshold (Second Threshold) n in the embodiment of the present invention.The meaning of SOH counting is after the calculating of n time, if the equivalent capacity calculated is continuously always lower than the equivalent capacity stored, then substantially can determine that the capacity of electrokinetic cell there occurs decay really.The initial value of SOH counting is 0, when the equivalent capacity that step S20 input stores, and the SOH counting that synchronous input stores, then step S4 comprises:
Step S41, when described difference is greater than first threshold, adds 1 by the SOH of described storage counting and obtains new SOH and count, otherwise is then counted by the SOH of described storage and make zero;
Step S42, judges whether described new SOH counting is greater than Second Threshold n;
Step S43, when described new SOH counting is greater than Second Threshold n, the following step of executed in parallel:
Step S431, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage;
Step S432, deducts described first numerical value by described electrokinetic cell current health state SOH numerical value;
Step S433, by described new SOH counting zero.
In addition, also comprising step S44, when described SOH counting is less than or equal to Second Threshold n, is described new SOH counting by the SOH count update of described storage.
Similar to upgrading the equivalent capacity stored, the SOH upgraded according to the different magnitude relationship from Second Threshold n counts (step S433 or step S44, wherein SOH is counted zero and is renewal by step S433), or according to the equivalent capacity of described calculating and the difference of equivalent capacity of described storage and the magnitude relationship of first threshold and the SOH upgraded counts (SOH is counted zero and is renewal by step S41), the SOH as the storage inputted by step S20 when estimating next time is counted.
Second Threshold n is natural number, if represent that the difference of n the rear equivalent capacity of calculating and the equivalent capacity of storage continuously is all greater than first threshold, has just certainly occurred the decay of capacity, has then needed adjustment SOH numerical value.N is adjustable, as concrete how many, needs actual test calibration to do.
Known by foregoing description, the present invention is by calculating equivalent capacity in actual driving conditions, and compare with the equivalent capacity stored, judge whether difference exceedes the first threshold of setting, according to judged result, SOH numerical value is processed, the succinct and relatively accurate life-span estimating electrokinetic cell.The present invention does not need to design complicated model and in earlier stage a large amount of test figures, simultaneously, capacity be the capacity of power brick calculated, and not only consider the capacity attenuation of battery cell, therefore, SOH estimation in the present invention is the characteristic considering inconsistency between battery cell in power brick, namely considers the whole volume decay of power brick, thus the succinct and relatively accurate estimating battery life-span.Because original SOH evaluation method is complicated, and degree of accuracy is not necessarily high, and therefore, the pure electric drive class vehicle of most of extrapolating electricity does not enable health status estimation function.The present invention can in the pure electric drive class vehicle of extrapolating electricity, and relatively fast, the relatively accurate estimation function enabling cell health state, and without the need to carrying out the Complex Modeling on software to battery, early stage is also without the need to carrying out the test calibration of large amount of complex.
Shown in Fig. 3, based on the embodiment of the present invention one, the embodiment of the present invention two provides a kind of device estimating Vehicular dynamic battery health status numerical value, comprising:
Computing unit 31, the pressure,volume and temperature estimated during for completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
First judging unit 32, for judging whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Second judging unit 33, for when described first judging unit 32 judges that the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Processing unit 34, for when described second judging unit 33 judges that described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
Beneficial effect about the present embodiment please refer to the description of the embodiment of the present invention one, repeats no more herein.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (9)
1. estimate a method for Vehicular dynamic battery health status numerical value, comprising:
Step S1, the pressure,volume and temperature estimated when completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
Step S2, judges whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Step S3, when the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Step S4, when described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
2. method according to claim 1, is characterized in that, described step S1 specifically comprises:
Step S11, judges whether described electrokinetic cell completes charging;
Step S12, when described electrokinetic cell completes charging, the pressure,volume and temperature of input estimation;
Step S13, according to the pressure,volume and temperature of described estimation, calculates the equivalent capacity of described electrokinetic cell.
3. method according to claim 1, is characterized in that, also comprises before described step S2:
Step S20, the equivalent capacity that input stores.
4. method according to claim 1, is characterized in that, also comprises after described step S2:
Step S21, when the equivalent capacity of described calculating is greater than the equivalent capacity of described storage, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage.
5. method according to claim 1, is characterized in that, while the described step S4 of execution, also comprises and performs step S40, when described difference is greater than first threshold, the equivalent capacity of described storage is updated to the equivalent capacity of described calculating.
6. method according to claim 3, is characterized in that, described step S20 also comprises: the SOH counting that input stores, and the initial value of described SOH counting is 0.
7. method according to claim 6, is characterized in that, described step S4 specifically comprises:
Step S41, when described difference is greater than first threshold, adds 1 by the SOH of described storage counting and obtains new SOH and count, otherwise is then counted by the SOH of described storage and make zero;
Step S42, judges whether described new SOH counting is greater than Second Threshold;
Step S43, when described new SOH counting is greater than described Second Threshold, the following step of executed in parallel:
Step S431, is updated to the equivalent capacity of described calculating by the equivalent capacity of described storage;
Step S432, deducts described first numerical value by described electrokinetic cell current health state SOH numerical value;
Step S433, by described new SOH counting zero.
8. method according to claim 7, is characterized in that, described method also comprises:
The SOH count update of described storage, when described SOH counting is less than or equal to described Second Threshold, is described new SOH counting by step S34.
9. estimate a device for Vehicular dynamic battery health status numerical value, it is characterized in that, comprising:
Computing unit, the pressure,volume and temperature estimated during for completing charging according to electrokinetic cell, calculates the equivalent capacity of described electrokinetic cell;
First judging unit, for judging whether the equivalent capacity of described calculating is less than the equivalent capacity of storage;
Second judging unit, for when described first judging unit judges that the equivalent capacity of described calculating is less than the equivalent capacity of described storage, whether the difference of both judgements is greater than first threshold;
Processing unit, for when described second judging unit judges that described difference is greater than first threshold, deducts the first numerical value by described electrokinetic cell current health state SOH numerical value.
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| CN118362898A (en) * | 2024-04-24 | 2024-07-19 | 苏州特瑞菲机械设备有限公司 | New energy automobile battery performance detection system and method |
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Effective date of registration: 20211231 Address after: 511434 No. 36, Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION New Energy Vehicle Co.,Ltd. Address before: 510000 23 building, Cheng Yue mansion 448-458, Dongfeng Middle Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: GUANGZHOU AUTOMOBILE GROUP Co.,Ltd. |
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Address after: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee after: GAC AION NEW ENERGY AUTOMOBILE Co.,Ltd. Country or region after: China Address before: No. 36 Longying Road, Shilou Town, Panyu District, Guangzhou City, Guangdong Province Patentee before: GAC AION New Energy Vehicle Co.,Ltd. Country or region before: China |
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