CN105607011A - Method and device for estimating state of health (SOH) of battery - Google Patents
Method and device for estimating state of health (SOH) of battery Download PDFInfo
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- CN105607011A CN105607011A CN201610169510.0A CN201610169510A CN105607011A CN 105607011 A CN105607011 A CN 105607011A CN 201610169510 A CN201610169510 A CN 201610169510A CN 105607011 A CN105607011 A CN 105607011A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Abstract
The invention provides a method and a device for estimating the state of health (SOH) of a battery. The method comprises: executing the following steps for each sampling interval from determining that the battery satisfies the initial condition of electric quantity accumulation to determining that the battery satisfies the end condition of electric quantity accumulation: acquiring battery discharge current and battery charge current obtained after the current of the battery is sampled, and calculating the net discharge quantity within the sampling interval based on the battery discharge current and the battery charge current; calculating the accumulated value of the net discharge quantities of the battery within all sampling intervals; determining the accumulated value as the current electric quantity value of the battery between the initial condition and the end condition; and estimating the SOH of the battery based on the current electric quantity value. By adopting the method and the device, the accurate current electric quantity value of the battery can be obtained, and then the SOH of the battery can be estimated by using the accurate current electric quantity value.
Description
Technical field
The application relates to field of automobile, relates in particular to evaluation method and the dress of a kind of cell health state SOHPut.
Background technology
Energy crisis is more and more serious in recent years, and hybrid vehicle, with its good energy-conserving and environment-protective feature, becomes futureThe development priority of automobile industry. Hybrid vehicle mainly refers to the automobile using gasoline and two kinds of energy of electric energy as power. ForTwo kinds of energy easy to use, are not only provided with fuel tank but also be provided with battery in hybrid vehicle. In order effectively to improve circulating batteryIn service life, generally adopt battery management system (batteryManagementSystem, BMS) to carry out management and control battery.
For battery management system, battery and battery pack dump energy (StateofCharge) and battery strongHealth state (StateofHealth, SOH) is very important two parameters. Wherein, SOH represents the storage electricity that battery is currentAmount ability, the larger expression battery storage of SOH electric weight ability is stronger, and the less expression battery storage of SOH electric weight ability is more weak. Be accompanied byThe use of battery, the physical characteristic of inside battery can change, and this can cause the SOH of battery to reduce.
In actual application, the SOH of battery can help driver and maintenance personal the service life of electrolytic cellSituation. Therefore, know that the SOH of battery is for hybrid vehicle, there is very large realistic meaning.
The application applicant finds in research process: the estimation mode of current SOH has multiple, and wherein a kind of utilization definesEstimation mode, be specially:
Wherein, QNowFor the charge value that battery can discharge under certain condition, QNewFor the new battery of same model is equallyThe standard electric value that can discharge under condition. Be understandable that, due to QNewBe fix constant, therefore only need to calculateObtain the battery current electric quantity value Q that can discharge under certain conditionNow, just can estimate the health status that obtains batterySOH。
At present, calculate the current electric quantity value Q that battery can dischargeNowProcess be mainly: battery management system is transported at automobileIn row process, can be stored in EEPROM continual battery discharge capacity, can be to the discharge capacity of battery in EEPROMAdd up, therefore, the cumulative charge value obtaining in EEPROM is the current charge value Q of batteryNow。
But aforesaid way is only suitable in ideal conditions, aforesaid way is only carrying out once people for filling to batteryAfter electricity, before extremely next artificial charging, in the absence that other power source charges to battery again, be suitable for. Because, in this phaseBetween battery electric quantity be continuous decrease, so in a manner described in EEPROM the charge value that obtains of accumulative total be the current standard of batteryTrue charge value QNow。
But, for hybrid vehicle, what battery is carried out once after artificial charging to artificial charging next timeBefore, still have other power source to charge for battery. That is, battery electric quantity is not continuous decrease during this period, but constantlyChange. For example, in car running process battery electric quantity in continuous decline, in the time needing suddenly car deceleration operation, canUtilize in moderating process automobile power again for battery charges, more abundant to ensure the electric energy energy.
Therefore, for hybrid vehicle, the current charge value Q of battery calculating in a manner describedNowNotAccurately. So, need now a kind of mode accurately to calculate the current charge value Q of hybrid vehicleNow, to accurately estimateCalculate the SOH of battery in hybrid vehicle.
Summary of the invention
Given this, the application provides evaluation method and the device of a kind of cell health state SOH, to accurately calculate mixedClose the current charge value Q of power vehicleNow, to accurately estimate the SOH of battery in hybrid vehicle.
To achieve these goals, the application provides following technological means:
An evaluation method of cell health state SOH, comprising:
When determining that battery meets the initial conditions of electric quantity accumulation, to determining that battery meets the termination condition of electric quantity accumulationTime till, each sampling interval is all carried out to following steps: obtain battery discharge current to obtaining after battery current sampling withBattery charge, calculates the clean electric discharge in the described sampling interval based on described battery discharge current and described battery chargeAmount;
Calculate the aggregate-value of the clean discharge capacity of battery in all sampling intervals;
Described aggregate-value is defined as to the current electric quantity value of battery between described initial conditions and described termination condition;
Based on the health status SOH of described current electric quantity value estimating battery.
Preferably, describedly calculate in the described sampling interval based on described battery discharge current and described battery chargeClean discharge capacity, comprising:
Calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current;
Calculate the battery charge capacity in the described sampling interval based on described battery charge;
By the difference of described battery discharge electric weight and described battery charge capacity, be defined as battery in the described sampling intervalClean discharge capacity.
Preferably, the termination condition that described definite battery meets electric quantity accumulation comprises: pre-if battery continues in discharge conditionIf after the time, the remaining capacity SOC of battery reaches first percentage in electric quantity accumulation interval, determines that battery meets electric quantity accumulationTermination condition;
The initial conditions that described definite battery meets electric quantity accumulation comprise: if battery continues Preset Time in discharge conditionAfter, the remaining capacity SOC of battery reaches second percentage in described electric quantity accumulation interval, determines that battery meets electric quantity accumulationInitial conditions;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
Preferably, the termination condition that described definite battery meets electric quantity accumulation comprises: pre-if battery continues in discharge conditionIf after the time, the open-circuit voltage values of battery reaches the first magnitude of voltage, determines that battery meets the termination condition of electric quantity accumulation;
The initial conditions that described definite battery meets electric quantity accumulation comprise: if battery continues Preset Time in discharge conditionAfter, the open-circuit voltage values of battery reaches second voltage value, determines that battery meets the initial conditions of electric quantity accumulation;
Wherein, described the first magnitude of voltage is less than described second voltage value.
Preferably, the deterministic process of described the first magnitude of voltage comprises: new battery of the same type corresponding open-circuit voltage and lotusOn the curve of electricity condition, by the magnitude of voltage corresponding with first percentage in described electric quantity accumulation interval, be defined as described the first electricityPressure value;
The deterministic process of described second voltage value comprises: at open-circuit voltage corresponding to new battery of the same type and state-of-chargeOn curve, by the magnitude of voltage corresponding with second percentage in described electric quantity accumulation interval, be defined as described second voltage value;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
An estimating device of cell health state SOH, comprising:
Determine electric quantity accumulation condition unit, the initial conditions and the definite battery that meet electric quantity accumulation for definite battery are fullThe termination condition of foot electric quantity accumulation;
Calculate clean discharge capacity unit, for each sampling interval is all carried out to following steps: obtain battery current is sampledAfter the battery discharge current and the battery charge that obtain, calculate based on described battery discharge current and described battery chargeClean discharge capacity in the described sampling interval;
Calculate aggregate-value unit, for calculating the aggregate-value of the clean discharge capacity of battery in all sampling intervals;
Determine charge value unit, for described aggregate-value being defined as to battery at described initial conditions and described termination conditionBetween current electric quantity value;
Estimation SOH unit, for the health status SOH based on described current electric quantity value estimating battery.
Preferably, describedly calculate in the described sampling interval based on described battery discharge current and described battery chargeThe process of clean discharge capacity, specifically comprises:
Calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current; Based on described battery chargingBattery charge capacity described in Current calculation in the sampling interval; Poor by described battery discharge electric weight and described battery charge capacityBe worth, be defined as the clean discharge capacity of battery in the described sampling interval.
Preferably, described definite electric quantity accumulation condition unit comprises:
The first termination condition determining unit, if continue after Preset Time the residual electricity of battery in discharge condition for batteryAmount SOC reaches first percentage in electric quantity accumulation interval, determines that battery meets the termination condition of electric quantity accumulation;
The first initial conditions determining unit, if continue after Preset Time the residual electricity of battery in discharge condition for batteryAmount SOC reaches second percentage in described electric quantity accumulation interval, determines that battery meets the initial conditions of electric quantity accumulation;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
Preferably, described definite electric quantity accumulation condition unit comprises:
The second termination condition determining unit, if continue after Preset Time the open circuit electricity of battery in discharge condition for batteryPressure value reaches the first magnitude of voltage, determines that battery meets the termination condition of electric quantity accumulation;
The second initial conditions determining unit, if continue after Preset Time the open circuit electricity of battery in discharge condition for batteryPressure value reaches second voltage value, determines that battery meets the initial conditions of electric quantity accumulation;
Wherein, described the first magnitude of voltage is less than described second voltage value.
Preferably, described definite electric quantity accumulation condition unit also comprises:
The the first magnitude of voltage determining unit being connected with described the second termination condition determining unit, at new battery of the same typeOn corresponding open-circuit voltage and the curve of state-of-charge, by the magnitude of voltage corresponding with first percentage in electric quantity accumulation interval, reallyBe decided to be described the first magnitude of voltage;
The second voltage value determining unit being connected with described the second initial conditions determining unit, at new battery of the same typeOn corresponding open-circuit voltage and the curve of state-of-charge, by the voltage corresponding with second percentage in described electric quantity accumulation intervalValue, is defined as described second voltage value;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
By above technological means, can find out that the application has following beneficial effect:
The application provides evaluation method and the device of a kind of cell health state SOH, the electric quantity accumulation that this method is being setIn between initial conditions and termination condition, having several sampling instants, is a sampling interval between adjacent two sampling instants.Can carry out charging action and/or discharging action in each sampling instant, sampling instant sampling obtains battery charge and electricityTank discharge electric current goes for next-door neighbour's sampling interval. Therefore, each sampling interval is all carried out to following steps: obtain this and adoptBattery discharge current in sample interval and battery charge, calculate based on battery discharge current and described battery chargeClean discharge capacity in the described sampling interval.
For all time intervals between electric quantity accumulation initial conditions and termination condition, all obtain only putting of correspondence with itAfter electric weight, just calculate the aggregate-value of the clean discharge capacity in all time intervals. Aggregate-value is just equivalent to battery to be risen at electric quantity accumulationCurrent electric quantity value between beginning condition and termination condition.
Because the application's account form is all got rid of battery charge capacity within each time interval, therefore, each samplingDischarge capacity in interval is all clean discharge capacities of battery charge, so, in the charge value of the battery finally calculating notComprise the charge volume of other power source to battery. Therefore it is accurate, utilizing the current electric quantity value of the battery that the manner calculates, be also accurately thereby make the SOH that utilizes the estimation of current electric quantity value to obtain battery.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existingHave the accompanying drawing of required use in technical description to be briefly described, apparently, the accompanying drawing in the following describes is only thisSome embodiment of application, for those of ordinary skill in the art, not paying under the prerequisite of creative work, all rightObtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the evaluation method of the disclosed a kind of cell health state SOH of the embodiment of the present application;
Fig. 2 is the open-circuit voltage of the disclosed battery of the embodiment of the present application and the curve of battery dump energy;
Fig. 3 is the flow chart of the evaluation method of disclosed another the cell health state SOH of the embodiment of the present application;
Fig. 4 is the structural representation of the estimating device of the disclosed a kind of cell health state SOH of the embodiment of the present application;
Fig. 5 is the structural representation of disclosed another the cell health state SOH device of the embodiment of the present application;
Fig. 6 is the structural representation of disclosed another the cell health state SOH device of the embodiment of the present application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, completeDescribe, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiment wholely. Based onEmbodiment in the application, those of ordinary skill in the art are not making obtain under creative work prerequisite every otherEmbodiment, belongs to the scope that the application protects.
In field of hybrid electric vehicles, because the decision of the characteristic of hybrid vehicle, the remaining capacity SOC of Vehicular battery is notCan use up can not be 0%. Because automobile still need to be by the electric weight in battery in sparking, therefore, the electric weight of batteryThere is a minimum (for example, 20%). In hybrid vehicle use procedure, may in battery, charge, so fillingWhen electricity, can not make battery dump energy SOC is 100%, but has the higher limit (for example, 80%) of non-100%. Like thisCan keep automobile can charge to battery in running.
Therefore, generally, the scope of application of battery dump energy SOC is 20%-80%, the use model of some producersEnclose for 15%-95% or 30%-70%. The scope of application difference of the battery dump energy SOC of different manufacturers. For hybrid powerCar, for example, discharge capacity in the scope of application (, 20%-80%) of battery can reflect the health status SOH of battery. CauseThis, the application is the SOH of estimating battery in the scope of application of battery dump energy SOC just.
In order to calculate the charge value of battery, can select an electric quantity accumulation interval. This electric quantity accumulation interval can be electricityThe scope of application of pond remaining capacity SOC, or a subset of the battery dump energy SOC scope of application. Be understandable that,The scope in electric quantity accumulation interval is larger, and the charge value that finally calculates battery is more accurate. Therefore,, under preferable case, directly makeBy the scope of application of battery remaining capacity SOC as electric quantity accumulation interval. For accurate description electric quantity accumulation interval, adopt firstPercentage X1% and the second percentage X2% represent, electric quantity accumulation interval is [X1%, X2%] so.
Describe electric quantity accumulation interval in detail with an instantiation below. Suppose the use model of battery dump energy SOCEnclose for 20%-80%, so, electric quantity accumulation interval can be 20%-80%, 25%-75% or 30%-70%. Certainly electric weightAccumulative total interval can also be other numerical value, will not enumerate at this.
The application provides the evaluation method embodiment mono-of a kind of cell health state SOH, is applied to battery management systemBMS. As shown in Figure 1, specifically comprise the following steps:
Step S101: when determining that battery meets the initial conditions of electric quantity accumulation, to determining that battery meets electric quantity accumulationTermination condition time till, each sampling interval is all carried out to following steps: obtain the battery obtaining after battery current samplingDischarge current and battery charge, calculate in the described sampling interval based on described battery discharge current and battery chargeClean discharge capacity.
Owing to having set in advance electric quantity accumulation interval, interval the first percentage X1% and the second percentage of adopting of electric quantity accumulationRepresent than X2%, electric quantity accumulation interval is [X1%, X2%] so. Because the application will calculate battery in electric quantity accumulation intervalCharge value. Therefore,, if when battery dump energy SOC equals the second percentage X2% in discharge process, determine that battery meets electricityThe initial conditions of amount accumulative total. If when the remaining capacity SOC of battery equals the first percentage X1% in discharge process, determine batteryMeet the termination condition of electric quantity accumulation.
Between the initial conditions and termination condition of battery electric quantity accumulative total, be also clean in order accurately to calculate the charge value of batteryDischarge capacity, gets rid of the electric weight supply of other power source to battery. The application can be at initial conditions and the knot of battery electric quantity accumulative totalSampling instant between bundle condition is sampled to battery current. Between the initial conditions and termination condition of battery electric quantity accumulative totalHave multiple sampling instants, each sampling instant can to battery current, sampling should be carried out.
Battery management system can be distinguished to the electric current of battery charging and by the outwards electric current of output of battery. Therefore, electricityPond management system can for battery both direction, (from the electric current of battery output, ecto-entad charges to battery from inside to outsideElectric current) electric current sample, thereby obtain battery charge IinAnd battery discharge current Iout. If in the time of a timeThe electric current of not oriented battery charging in quarter, battery charge IinEqual zero, in like manner, if do not have electricity within moment timePond is the electric current of output outwards, battery discharge current IoutEqual zero.
In battery management system, between adjacent two sampling instants, it is a sampling interval. Because sample frequency is very high,Therefore generally all give tacit consent within the sampling interval, still carry out according to the charging current of a upper sampling instant and discharge currentDischarge and recharge. For example, taking a sampling instant A as example, can sample and obtain battery charge A1 and battery is put at sampling instant AElectricity electric current A2, because sample frequency is very high, so it is generally acknowledged that in the sampling interval being close to, battery is same after sampling instant AObtain battery charge A1 and battery discharge current A2 discharges and recharges according to the sampling of sampling instant A.
Therefore, obtain battery charge I a sampling instantinAnd battery discharge current IoutAfterwards, in this samplingAlso existing battery charge I in the next-door neighbour's in moment the time intervalinThere is again battery discharge current Iout. Due to battery chargingElectric current IinBelong in this application extra power source battery is charged, therefore based on battery charge IinThe battery obtainingCharge capacity, belongs to the extra power source electric weight to battery supply.
Therefore, need be based on described battery discharge current IoutWith described battery charge IinCalculate in the described sampling intervalClean discharge capacity. Learning a battery discharge current I in the time intervaloutWith described battery charge IinAfterwards, canRespectively by battery discharge current IoutWith described battery charge IinIn substitution formula (2), carry out integral operation with the time interval,And then calculate respectively battery discharge electric weight and battery charge capacity. Battery discharge electric weight is deducted to the poor of battery charge capacityValue, as the clean discharge electricity amount in a sampling interval.
Q＝∫Idt………………(2)
Wherein, Q is the clean discharge capacity in a time interval, I be a time interval battery charge or, batteryDischarge current.
According to said process, all time intervals in electric quantity accumulation interval are calculated, thereby can calculate everyClean discharge capacity in the individual sampling interval.
Step S102: the aggregate-value that calculates the clean discharge capacity of battery in all sampling intervals.
In the process computation that utilizes step S101 obtains electric quantity accumulation interval the clean discharge capacity in each time interval itAfter, be understandable that, can calculate battery in all sampling intervals clean discharge capacity and value, and value is battery at electric weightThe aggregate-value of clean discharge capacity in accumulative total is interval.
Be understandable that, can the clean discharge capacity in a sampling interval calculate complete after, by this clean discharge capacity withThe aggregate-value summation of the clean discharge capacity in all sampling intervals before, as the clean discharge capacity in new all sampling intervals, successivelyStack, to the last the clean discharge capacity in a sampling interval is cumulative complete, obtains final electric quantity accumulation value. Also can, in instituteHave the clean discharge capacity in sampling interval all calculate complete after, then ask for all discharge capacities and value, using with value as final electricityAmount aggregate-value.
Step S103: described aggregate-value is defined as to current between described initial conditions and described termination condition of batteryCharge value.
Be understandable that, the aggregate-value of the clean discharge capacity in all time intervals is that battery is in electric quantity accumulation intervalTotal discharge capacity is also the charge value of battery in electric quantity accumulation interval. Therefore, aggregate-value is defined as to battery at described initial oneCharge value between part and described termination condition.
Step S104: based on the health status SOH of described current electric quantity value estimating battery.
The mode of the estimating state of health of battery in this step can adopt following formula:
Wherein, QNowFor battery is at described initial conditions and described termination conditionBetween current electric quantity value, QNewFor new battery of the same type standard electric between described initial conditions and described termination conditionValue. The scope of application of supposing battery dump energy is 30%-70%, and electric quantity accumulation interval is also 30%-70%, so,The current electric quantity value of the battery that estimation obtains is QNow, estimate that for new battery of the same type new battery is tired at identical electric weight in advanceCount interval standard electric value QNew. Then, by QNowAnd QNewSubstitution formulaIn, fromAnd obtain the health status SOH of battery using last result of calculation as estimation.
Generally, when the charge value of battery is new battery 80% time, for example, the electric weight of new battery is 100AH, electricityWhen the current electric weight in pond is 80AH, the life-span of this battery stops substantially. So, for the health status SOH of accurate estimating battery,Need to consider the service life of battery, the implication of 0.8 in above-mentioned formula is at this.
Due to the charge value Q of the battery calculating in the applicationNowAccurately, therefore, the battery that estimation obtainsHealth status SOH is also comparatively accurately, so, the mode of utilizing the application to provide, the accurately health of estimating batteryState SOH.
By finding out that with upper type the application has following beneficial effect:
The application provides the evaluation method of a kind of cell health state SOH, because the application's account form is when eachBetween all get rid of battery charge capacity in interval, therefore, the discharge capacity in each sampling interval is all only putting of battery chargeElectric weight, so, the charge volume of other power source to battery in the charge value of the battery finally calculating, do not comprised. Therefore, profitThe current electric quantity value of the battery calculating by the manner is accurately, thereby makes to utilize the estimation of current electric quantity value to obtain batterySOH be also accurately.
In the step S101 of embodiment mono-, determine that battery meets the initial conditions of electric quantity accumulation and the process of termination conditionUtilize battery dump energy SOC to determine. But, because battery dump energy SOC is the internal state of battery, Wu FazhiConnect and measure. Can only utilize the measured values such as electric current, voltage, temperature to remove estimating remaining capacity of battery SOC, so remaining battery electricityAmount SOC itself has error.
Therefore, itself have on the basis of error at battery dump energy SOC, recycling battery dump energy SOC determinesElectric quantity accumulation interval, and then determine again initial conditions and the termination condition that battery adds up, this can further increase error. So,The application applicant imagines the unfavorable knot of directly determining initial conditions and the battery accumulative total of battery accumulative total with battery dump energyBundle condition, but utilize battery dump energy indirectly to determine initial conditions and the termination condition of battery accumulative total.
Electric quantity accumulation interval is made up of the first percentage X1% and the second percentage X2% of battery dump energy SOC,[X1%, X2%]. Because battery dump energy SOC is corresponding with the open-circuit voltage of battery, so the application can carry by manufacturerOCV-SOC (open-circuit voltage-state-of-charge) curve of the new battery of the same type of confession, determines electric quantity accumulation interval.
Shown in Figure 2, be a kind of OCV-SOC curve of battery. Transverse axis is the percentage of dump energy, and the longitudinal axis is open circuitVoltage. From curve, can find out, battery dump energy SOC becomes one-to-one relationship with the open-circuit voltage of battery. Therefore, canOn OCV-SOC curve, search the first magnitude of voltage U1 corresponding with the first percentage X1%, and with the second percentage X2% coupleThe second voltage value U2 answering. Then, by voltage range [U1, the U2] conduct being formed by the first magnitude of voltage U1 and second voltage value U2With electric quantity accumulation interval.
By the new mode of determining electric quantity accumulation interval, provide the evaluation method of a kind of cell health state SOH belowEmbodiment bis-, is applied to battery management system BMS. As shown in Figure 3, specifically comprise the following steps:
Step S301: judge whether battery meets the initial conditions of electric quantity accumulation. If so, enter step S302, if not,Continue execution step S301.
The initial conditions that described definite battery meets electric quantity accumulation comprise: if battery continues Preset Time in discharge conditionAfter, the open-circuit voltage values of battery reaches second voltage value, determines that battery meets the initial conditions of electric quantity accumulation.
Particularly: battery management system can continue the state of monitoring battery, when battery is in discharge condition and remain pre-If after the time, determine that battery is in stable discharge condition. Whether the open-circuit voltage that then, judges battery equals second voltage valueU2. If so, determine that battery meets the initial conditions of electric quantity accumulation. , battery discharged into the second percentage correspondingTwo magnitudes of voltage.
If not, illustrate that battery is not at present also in stable discharging state, or the open-circuit voltage of battery does not reach initialThe second voltage value U2 that condition is corresponding, so repeated execution of steps S301 is until battery meets the initial conditions of electric quantity accumulation.
Step S302: obtain the battery discharge current and the battery charge that obtain after battery current sampling, based on instituteState battery discharge current and battery charge and determine the clean discharge capacity of battery in the described sampling interval.
Determine the clean discharge capacity of battery in the described sampling interval based on described battery discharge current and battery chargeProcess is particularly: calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current; Based on describedBattery charge is calculated the battery charge capacity in the described sampling interval; By described battery discharge electric weight and the charging of described batteryThe difference of electric weight, is defined as the clean discharge capacity of battery in the described sampling interval.
Step S303: judge whether battery meets the termination condition of electric quantity accumulation. If so, enter step S304, otherwiseEnter step S302.
The termination condition that described definite battery meets electric quantity accumulation comprises: if battery continues Preset Time in discharge conditionAfter, the open-circuit voltage values of battery reaches the first magnitude of voltage, determines that battery meets the termination condition of electric quantity accumulation.
Particularly: battery management system can continue the state of monitoring battery, when battery is in discharge condition and remain pre-If after the time, determine that battery is in stable discharge condition. Whether the open-circuit voltage that then, judges battery equals the first magnitude of voltageU1. If so, determine that battery meets the termination condition of electric quantity accumulation. , battery discharged into the first percentage correspondingOne magnitude of voltage.
If not, illustrate that battery is not at present also in stable discharging state, or the open-circuit voltage of battery does not reach endThe first magnitude of voltage U1 that condition is corresponding. So, can return to step S302, compute repeatedly the clean discharge capacity in each time interval,Until battery meets the termination condition of electric quantity accumulation.
Step S304: the aggregate-value that calculates the clean discharge capacity of battery in all sampling intervals.
Step S305: described aggregate-value is defined as to current between described initial conditions and described termination condition of batteryCharge value.
Step S306: based on the health status SOH of described current electric quantity value estimating battery.
In the present embodiment two, the implementation of step S302, step S304, step S305 and step S306 is at embodimentIn one, be described in detail, particular content refers to the specific descriptions of embodiment mono-, does not repeat them here.
Implementation by embodiment bis-can find out, embodiment bis-is owing to determining electric quantity accumulation district according to new modeBetween, so can determine more accurately initial conditions and the termination condition of electric quantity accumulation, thus can make electric quantity accumulation districtBetween more accurate, and then make the current electric quantity value of the battery calculating more accurate, then make based on current electric quantity valueThe SOH of the battery that estimation obtains is more accurate.
As shown in Figure 4, the application also provides the estimating device of a kind of cell health state SOH, comprising:
Determine electric quantity accumulation condition unit 41, for determining that battery meets initial conditions and definite battery of electric quantity accumulationMeet the termination condition of electric quantity accumulation.
Calculate clean discharge capacity unit 42, for each sampling interval is all carried out to following steps: obtain battery current is adoptedThe battery discharge current obtaining after sample and battery charge, based on described battery discharge current and described battery charge meterCalculate the clean discharge capacity in the described sampling interval;
Calculate clean discharge capacity in the described sampling interval based on described battery discharge current and described battery chargeDetailed process can be: calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current; Based on describedBattery charge is calculated the battery charge capacity in the described sampling interval; By described battery discharge electric weight and the charging of described batteryThe difference of electric weight, is defined as the clean discharge capacity of battery in the described sampling interval.
Calculate aggregate-value unit 43, for calculating the aggregate-value of the clean discharge capacity of battery in all sampling intervals;
Determine charge value unit 44, for described aggregate-value being defined as to battery at described initial conditions and described end barCurrent electric quantity value between part.
Estimation SOH unit 45, for the health status SOH based on described current electric quantity value estimating battery.
Wherein, described definite electric quantity accumulation condition unit 41 can have two kinds of implementations:
The first implementation:
As shown in Figure 5, described definite electric quantity accumulation condition unit 41 comprises:
The first termination condition determining unit 51, if continue after Preset Time the residue of battery in discharge condition for batteryElectric weight SOC reaches first percentage in electric quantity accumulation interval, determines that battery meets the termination condition of electric quantity accumulation.
The first initial conditions determining unit 52, if continue after Preset Time the residue of battery in discharge condition for batteryElectric weight SOC reaches second percentage in described electric quantity accumulation interval, determines that battery meets the initial conditions of electric quantity accumulation.
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
The second implementation:
As shown in Figure 6, described definite electric quantity accumulation condition unit 41 comprises:
The second termination condition determining unit 61, if continue after Preset Time the open circuit of battery in discharge condition for batteryMagnitude of voltage reaches the first magnitude of voltage, determines that battery meets the termination condition of electric quantity accumulation.
The the first magnitude of voltage determining unit 62 being connected with described the second termination condition determining unit, at new electricity of the same typeOn the open-circuit voltage that pond is corresponding and the curve of state-of-charge, by the magnitude of voltage corresponding with first percentage in electric quantity accumulation interval,Be defined as described the first magnitude of voltage.
The second initial conditions determining unit 63, the initial conditions that meet electric quantity accumulation for described definite battery comprise: ifBattery continues after Preset Time in discharge condition, and the open-circuit voltage values of battery reaches second voltage value, determines that battery meets electricityThe initial conditions of amount accumulative total; Wherein, described the first magnitude of voltage is less than described second voltage value.
The second voltage value determining unit 64 being connected with described the second initial conditions determining unit 63, for of the same type newOn the open-circuit voltage that battery is corresponding and the curve of state-of-charge, by the electricity corresponding with second percentage in described electric quantity accumulation intervalPressure value, is defined as described second voltage value;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and describedOne percentage is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
By the description of the above-mentioned estimating device to cell health state, can find out that this device has following advantage:
The application provides the estimating device of a kind of cell health state SOH, electric quantity accumulation initial conditions and the knot setIn between bundle condition, having several sampling instants, is a sampling interval between adjacent two sampling instants. In the time of each samplingCan carry out charging action and/or discharging action quarter, sampling instant sampling obtains battery charge and battery discharge current canTo be applicable to next-door neighbour's sampling interval. Therefore, each sampling interval is all carried out to following steps: obtain the electricity in this sampling intervalTank discharge electric current and battery charge, calculate the described sampling interval based on battery discharge current and described battery chargeInterior clean discharge capacity.
For all time intervals between electric quantity accumulation initial conditions and termination condition, all obtain only putting of correspondence with itAfter electric weight, just calculate the aggregate-value of the clean discharge capacity in all time intervals. Aggregate-value is just equivalent to battery to be risen at electric quantity accumulationCurrent electric quantity value between beginning condition and termination condition.
Because the discharge capacity in each sampling interval of calculating of the application is all clean discharge capacities of battery charge,So, in the charge value of the battery finally calculating, do not comprise the charge volume of other power source to battery. Therefore, utilize weThe current electric quantity value of the battery that formula calculates is accurately, thereby makes to utilize the estimation of current electric quantity value to obtain the SOH of batteryAlso be accurately.
If the function described in the present embodiment method realizes and as product pin independently using the form of SFU software functional unitWhen selling or using, can be stored in a computing equipment read/write memory medium. Based on such understanding, the embodiment of the present applicationThe part that prior art is contributed or the part of this technical scheme can embody with the form of software product, and this is softPart product is stored in a storage medium, comprise some instructions in order to make a computing equipment (can be personal computer,Server, mobile computing device or the network equipment etc.) carry out all or part of step of method described in each embodiment of the applicationSuddenly. And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only storage (ROM, Read-OnlyMemory), deposit at randomThe various media that can be program code stored such as access to memory (RAM, RandomAccessMemory), magnetic disc or CD.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and otherThe difference of embodiment, between each embodiment same or similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the application.To be apparent, as defined herein for those skilled in the art to the multiple amendment of these embodimentGeneral Principle can, in the case of not departing from the application's spirit or scope, realize in other embodiments. Therefore, the applicationTo can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty phase oneThe widest scope causing.
Claims (10)
1. an evaluation method of cell health state SOH, is characterized in that, comprising:
When determining that battery meets the initial conditions of electric quantity accumulation, to determining that battery while meeting the termination condition of electric quantity accumulation isOnly, each sampling interval is all carried out to following steps: obtain the battery discharge current and the battery that obtain after battery current samplingCharging current, calculates the clean discharge capacity in the described sampling interval based on described battery discharge current and described battery charge;
Calculate the aggregate-value of the clean discharge capacity of battery in all sampling intervals;
Described aggregate-value is defined as to the current electric quantity value of battery between described initial conditions and described termination condition;
Based on the health status SOH of described current electric quantity value estimating battery.
2. the method for claim 1, is characterized in that, described based on described battery discharge current and the charging of described batteryClean discharge capacity described in Current calculation in the sampling interval, comprising:
Calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current;
Calculate the battery charge capacity in the described sampling interval based on described battery charge;
By the difference of described battery discharge electric weight and described battery charge capacity, be defined as only putting of interior battery of described sampling intervalElectric weight.
3. the method for claim 1, is characterized in that, described definite battery meets the termination condition bag of electric quantity accumulationDraw together: if battery continues after Preset Time in discharge condition, the remaining capacity SOC of battery reaches first percentage in electric quantity accumulation intervalRatio, determines that battery meets the termination condition of electric quantity accumulation;
The initial conditions that described definite battery meets electric quantity accumulation comprise: if battery continues after Preset Time in discharge condition, and electricityThe remaining capacity SOC in pond reaches second percentage in described electric quantity accumulation interval, determines that battery meets the initial of electric quantity accumulationCondition;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and the described the 100Proportion by subtraction is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
4. the method for claim 1, is characterized in that, described definite battery meets the termination condition bag of electric quantity accumulationDraw together: if battery continues after Preset Time in discharge condition, the open-circuit voltage values of battery reaches the first magnitude of voltage, determine that battery is fullThe termination condition of foot electric quantity accumulation;
The initial conditions that described definite battery meets electric quantity accumulation comprise: if battery continues after Preset Time in discharge condition, and electricityThe open-circuit voltage values in pond reaches second voltage value, determines that battery meets the initial conditions of electric quantity accumulation;
Wherein, described the first magnitude of voltage is less than described second voltage value.
5. method as claimed in claim 4, is characterized in that,
The deterministic process of described the first magnitude of voltage comprises: at open-circuit voltage corresponding to new battery of the same type and the curve of state-of-chargeUpper, by the magnitude of voltage corresponding with first percentage in described electric quantity accumulation interval, be defined as described the first magnitude of voltage;
The deterministic process of described second voltage value comprises: at open-circuit voltage corresponding to new battery of the same type and the curve of state-of-chargeUpper, by the magnitude of voltage corresponding with second percentage in described electric quantity accumulation interval, be defined as described second voltage value;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and the described the 100Proportion by subtraction is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
6. an estimating device of cell health state SOH, is characterized in that, comprising:
Determine electric quantity accumulation condition unit, for determining that battery meets initial conditions and the satisfied electricity of definite battery of electric quantity accumulationThe termination condition of amount accumulative total;
Calculate clean discharge capacity unit, for each sampling interval is all carried out to following steps: obtain obtaining after battery current samplingThe battery discharge current arriving and battery charge, described in described battery discharge current and the calculating of described battery chargeClean discharge capacity in sampling interval;
Calculate aggregate-value unit, for calculating the aggregate-value of the clean discharge capacity of battery in all sampling intervals;
Determine charge value unit, for described aggregate-value being defined as to battery between described initial conditions and described termination conditionCurrent electric quantity value;
Estimation SOH unit, for the health status SOH based on described current electric quantity value estimating battery.
7. device as claimed in claim 6, is characterized in that, described based on described battery discharge current and the charging of described batteryThe process of the clean discharge capacity described in Current calculation in the sampling interval, specifically comprises:
Calculate the battery discharge electric weight in the described sampling interval based on described battery discharge current; Based on described battery chargeCalculate the battery charge capacity in the described sampling interval; By the difference of described battery discharge electric weight and described battery charge capacity,Be defined as the clean discharge capacity of battery in the described sampling interval.
8. device as claimed in claim 6, is characterized in that, described definite electric quantity accumulation condition unit comprises:
The first termination condition determining unit, if continue after Preset Time the remaining capacity SOC of battery in discharge condition for batteryReach first percentage in electric quantity accumulation interval, determine that battery meets the termination condition of electric quantity accumulation;
The first initial conditions determining unit, if continue after Preset Time the remaining capacity SOC of battery in discharge condition for batteryReach second percentage in described electric quantity accumulation interval, determine that battery meets the initial conditions of electric quantity accumulation;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and the described the 100Proportion by subtraction is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
9. device as claimed in claim 6, is characterized in that, described definite electric quantity accumulation condition unit comprises:
The second termination condition determining unit, if continue after Preset Time the open-circuit voltage values of battery in discharge condition for batteryReach the first magnitude of voltage, determine that battery meets the termination condition of electric quantity accumulation;
The second initial conditions determining unit, if continue after Preset Time the open-circuit voltage values of battery in discharge condition for batteryReach second voltage value, determine that battery meets the initial conditions of electric quantity accumulation;
Wherein, described the first magnitude of voltage is less than described second voltage value.
10. device as claimed in claim 9, is characterized in that, described definite electric quantity accumulation condition unit also comprises:
The the first magnitude of voltage determining unit being connected with described the second termination condition determining unit, in new battery correspondence of the same typeOpen-circuit voltage and the curve of state-of-charge on, by the magnitude of voltage corresponding with first percentage in electric quantity accumulation interval, be defined asDescribed the first magnitude of voltage;
The second voltage value determining unit being connected with described the second initial conditions determining unit, in new battery correspondence of the same typeOpen-circuit voltage and the curve of state-of-charge on, by the magnitude of voltage corresponding with second percentage in described electric quantity accumulation interval, reallyBe decided to be described second voltage value;
Wherein, described electric quantity accumulation interval is made up of the first percentage and second percentage of battery electric quantity, and the described the 100Proportion by subtraction is the lower limit in described electric quantity accumulation interval, and described the second percentage is the higher limit in described electric quantity accumulation interval.
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