CN102981123A - Estimation system and estimation method of power battery surplus capacity - Google Patents
Estimation system and estimation method of power battery surplus capacity Download PDFInfo
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- CN102981123A CN102981123A CN2012104371726A CN201210437172A CN102981123A CN 102981123 A CN102981123 A CN 102981123A CN 2012104371726 A CN2012104371726 A CN 2012104371726A CN 201210437172 A CN201210437172 A CN 201210437172A CN 102981123 A CN102981123 A CN 102981123A
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- electrokinetic cell
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Abstract
The invention relates to an estimation system of power battery surplus capacity and an estimation method of power battery surplus capacity. The estimation system comprises a current-voltage converter, a voltage-frequency converter and a microcontroller. An input end of the current-voltage converter is connected with charging/discharging current of a power battery, and therefore the charging/discharging current of the power battery are converted to an analog voltage signal. An input end of the voltage-frequency converter is connected with an output end of the current-voltage converter, and therefore the analog voltage signal output by the current-voltage converter is converted to a digit pulse signal. The strength of the digit pulse signal is in direct proportion to the strength of the charging/discharging current of the power battery. The microcontroller is connected with an output end of the voltage-frequency converter, and therefore the pulse count of the digit pulse signal output by the voltage-frequency converter is counted in a count cycle to estimate surplus capacity of the power battery. The estimation system of the power battery surplus capacity and the estimation method of the power battery surplus capacity have the advantages of being high in accuracy, rapid in response speed and capable of fitting for different application occasions with rapid change of load current of the power battery.
Description
Technical field
The present invention relates to the power battery technology field, particularly a kind of electrokinetic cell Residual capacity prediction system and evaluation method.
Background technology
As a kind of main walking-replacing tool and the means of transport in the modern society, automobile has profoundly incorporated people's life.Electrokinetic cell is as energy-storage travelling wave tube the most frequently used in the new-energy automobile, and the performance of electrokinetic cell plays conclusive effect to the performance of car load, and wherein the quality of battery management system directly has influence on battery life and vehicle performance.At this, electrokinetic cell is the power supply that instrument provides power resources, refers to provide for electric automobile, electric train, electric bicycle, golf cart etc. the battery of power more.
SOC(State of Charge, the state-of-charge of battery) is one of most important parameter of battery management system, want rationally to utilize electrokinetic cell, improve electrokinetic cell serviceable life, improve utilization rate of electrical, prolong the vehicle continual mileage, just SOC must be controlled in the rational scope, so the accuracy of SOC estimation is most important.
In theory, SOC is defined as follows:
Wherein, Q
tFor electrokinetic cell is calculating residual capacity constantly; Q
0Total charge value for electrokinetic cell.During discharge off, SOC is 0, and SOC then is 1 when being full of electricity fully.
At present, be the current integration method to the most frequently used method of electrokinetic cell SOC estimation, the theoretical calculation formula of current integration method SOC is as follows:
Wherein, Qt is constantly battery electric quantity of t; Q
0It is 0 moment (also being initial time) battery electric quantity; I
tBe the real-time current value (perhaps being referred to as charge/discharge current) that flows into/go out battery.
As seen, the current integration method need to be sampled to the battery charging/discharging electric current, and changes to obtain the current integration value through A/D, thereby calculates the residual capacity of battery by integrating meter.But, because the collection of electric current often will be carried out in the process of electric automobile during traveling, its working environment is comparatively abominable, such as electric equipment in the mechanical vibration in the external world, the car (such as chopper, motor, its peak point current can reach 600A) interference that produces, the temperature difference of environment (20 ~+65 ℃), all can have influence on the normal collection of electric current.Therefore, adopt the SOC of current integration method estimation electric automobile, can be subject to the multiple factors impacts such as current sample cycle, sampling precision, software stability, system responses ability, precision is lower, thereby cause easily the electrokinetic cell irrational utilization, utilization rate of electrical is low, even can reduce the serviceable life of electrokinetic cell.
Summary of the invention
The purpose of this invention is to provide a kind of electrokinetic cell Residual capacity prediction system and evaluation method, to solve the low problem of the precision that adopts prior art to adopt current integration method estimation power battery charged state (SOC) to exist.
Particularly, a kind of electrokinetic cell Residual capacity prediction system that the embodiment of the invention proposes comprises current-voltage converter, voltage-frequency converter and microcontroller.The input end of current-voltage converter connects the charge/discharge current of electrokinetic cell, is used for the charge/discharge current of electrokinetic cell is converted to analog voltage signal; The input end of voltage-frequency converter links to each other with the output terminal of current-voltage converter, is used for the analog voltage signal of current-voltage converter output is converted to digital pulse signal, and digital pulse signal is directly proportional with the charge/discharge current of electrokinetic cell; Microcontroller links to each other with the output terminal of voltage-frequency converter, is used for the umber of pulse of the digital pulse signal of statistics voltage-frequency converter output within the count cycle, with the residual capacity of estimation electrokinetic cell.
According to the described electrokinetic cell Residual capacity prediction of preferred embodiment of the present invention system, the umber of pulse of the digital pulse signal that microcontroller statistics voltage-frequency converter was exported in a hour, and according to the corresponding relation of frequency and electric current, the residual capacity of estimation electrokinetic cell.
According to the described electrokinetic cell Residual capacity prediction of preferred embodiment of the present invention system, microcontroller is field programmable gate array or CPLD or micro-control unit.
A kind of electrokinetic cell Residual capacity prediction method that the embodiment of the invention proposes in addition, may further comprise the steps: (1) is converted to analog voltage signal with the charge/discharge current of electrokinetic cell; (2) analog voltage signal is converted to digital pulse signal, digital pulse signal is directly proportional with the charge/discharge current of electrokinetic cell; And (3) umber of pulse of statistical figure pulse signal within the count cycle, with the residual capacity of estimation electrokinetic cell.
According to the described electrokinetic cell Residual capacity prediction of preferred embodiment of the present invention method, be specially during the residual capacity of estimation electrokinetic cell: the umber of pulse of the digital pulse signal of output in the statistics voltage-frequency converter one hour, and according to the corresponding relation of frequency and electric current, the residual capacity of estimation electrokinetic cell.
According to the described electrokinetic cell Residual capacity prediction of preferred embodiment of the present invention method, the umber of pulse that adopts field programmable gate array or CPLD or micro-control unit to add up this digital pulse signal.
With respect to prior art, the present invention can reach one or more in the following beneficial effect:
(1) it is few to take computational resource, only takies an input channel for a kind of simulating signal.
(2) good in anti-interference performance, because be by digital pulse signal is carried out the Residual capacity prediction that step-by-step counting realizes electrokinetic cell, so can avoid the environmental interference factor on estimation result's impact, advantage with accuracy height, fast response time can adapt to the electrokinetic cell load current and change rapidly various application scenarios.
(3) but the signal frequency flexible choice, the counting of pulse signal normally can adopt vehicle-mounted microprocessor to finish, thereby can be according to the suitable V/F converter of the condition of work of microprocessor coupling, implementation is comparatively simple.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is a kind of example structure figure of electrokinetic cell Residual capacity prediction of the present invention system;
Fig. 2 is a kind of embodiment process flow diagram of electrokinetic cell Residual capacity prediction method of the present invention.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, electrokinetic cell Residual capacity prediction system and its embodiment of evaluation method, method, step and effect to foundation the present invention proposes are described in detail as follows.
Relevant aforementioned and other technology contents of the present invention, Characteristic can clearly present in describing in detail with reference to graphic preferred embodiment in following the cooperation.By the explanation of embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, the present invention is limited.
Main thought of the present invention is: do not adopt traditional A/D (analog to digital conversion) sampling integral way, but current signal is transformed into pulse signal, the horizontal pulse of going forward side by side accumulative total finally obtains the current integration value.Specify the present invention below in conjunction with accompanying drawing.
See also Fig. 1, it is a kind of example structure figure of electrokinetic cell Residual capacity prediction of the present invention system, and it comprises current-voltage converter 1(I/V converter), voltage-frequency converter 2(V/F converter) and microcontroller 3.The input end of current-voltage converter 1 connects the charge/discharge current of electrokinetic cell, and the input end of voltage-frequency converter 2 links to each other with the output terminal of current-voltage converter 1, and output terminal links to each other with the input end of microcontroller 3.
Current-voltage converter 1 is used for the charge/discharge analog current of electrokinetic cell is converted to an analog voltage signal, owing to be to be converted to analog voltage signal by analog current signal directly, so this analog voltage signal is proportional to the charge/discharge current of electrokinetic cell.
The model of voltage-frequency converter 2 can be selected according to actual needs, such as ADVFC32, the AD650 of AD company; The LMx31 series of National Semiconductor; The VFC32 of BB company, VFC62 etc.The principle of work of voltage-frequency converter 2 is that the analog voltage signal that current-voltage converter 1 is exported is converted to digital pulse signal, the frequency of this digital pulse signal is proportional to analog voltage signal, and because analog voltage signal is the charge/discharge current that is proportional to electrokinetic cell, so the digital pulse signal that voltage-frequency converter 2 is exported is proportional to the charge/discharge current of electrokinetic cell equally.Because voltage-frequency converter 2 can guarantee that in wider frequency range its output frequency is proportional to input voltage, the frequency response ability that the tool height is wider, therefore the present invention is good to the real-time of electrokinetic cell charging and discharging currents integration, can reduce more really the charging and discharging currents curve.
Generally, electrokinetic cell all is the measurement unit that is used as electric weight with charge/discharge amount hourly (Ah), therefore the preferred umber of pulse by the digital pulse signal that measures in one hour (a kind of count cycle gives an example) of microcontroller 3 is estimated the residual capacity of electrokinetic cell.
Particularly, suppose 1A---N kHz; (the i.e. pulsed frequency of the corresponding N kHz of 1 ampere charge/discharge current, according to aforementioned, pulsed frequency and charge/discharge current are proportional, the corresponding relation of frequency and charge/discharge current can be directly obtains according to the model of current-voltage converter 1 and voltage-frequency converter 2, so N is known coefficient)
Then: 1A*1S---the N*1000 pulse; (i.e. the number of pulses of 1 ampere charge/discharge current correspondence in 1 second)
Correspondingly: 1A*3600S---1Ah---3600*N*1000 pulse; (i.e. the number of pulses of 1 ampere charge/discharge current correspondence in 1 hour)
So just can calculate the charge/discharge capacity value of electrokinetic cell=(step-by-step counting of microcontroller 3 within one hour count cycle is divided by (3600*N*1000)) Ah, namely can estimate the residual capacity of electrokinetic cell.
As seen, estimating system of the present invention does not adopt traditional AD sampling integral way, but current signal is transformed into pulse signal by the V/F converter, carry out pulse accumulative total by programmable logic device (PLD) or single-chip microcomputer, the final current integration value that obtains is owing to need not the electrokinetic cell charge/discharge current is gathered, so removed the impact of environmental factor on the estimation result from, advantage with accuracy height, fast response time can adapt to load current and change rapidly various application scenarios.
In addition, the embodiment of the invention proposes a kind of electrokinetic cell Residual capacity prediction method in addition, sees also Fig. 2, and it for example may further comprise the steps:
Step S1 is converted to analog voltage signal with the charge/discharge current of electrokinetic cell.At this, owing to be to be converted to analog voltage signal by analog current signal directly, so this analog voltage signal is proportional to the charge/discharge current of electrokinetic cell.
Step S2 is converted to digital pulse signal with analog voltage signal, and digital pulse signal is directly proportional with the charge/discharge current of electrokinetic cell.At this, the work that analog voltage signal is converted to digital pulse signal is finished by voltage-frequency converter 2, the principle of work of voltage-frequency converter is that the analog voltage signal that current-voltage converter 1 is exported is converted to digital pulse signal, the frequency of this digital pulse signal is proportional to analog voltage signal, and because analog voltage signal is the charge/discharge current that is proportional to electrokinetic cell, so digital pulse signal is proportional to the charge/discharge current of electrokinetic cell equally.Because voltage-frequency converter can guarantee that in wider frequency range its output frequency is proportional to input voltage, the frequency response ability that the tool height is wider, therefore the present invention is good to the real-time of electrokinetic cell charge/discharge current integration, can reduce more really the charging and discharging currents curve.
Step S3, the umber of pulse of this digital pulse signal of statistics within the count cycle is with the residual capacity of estimation electrokinetic cell.At this, can adopt various the have programmable logic device (PLD) of tally function or the countings that single-chip microcomputer is finished pulse signal, such as FPGA(Field-Programmable Gate Array, field programmable gate array), or CPLD (Complex Programmable Logic Device, CPLD), or MCU(Micro Control Unit, micro-control unit) etc.
Generally, electrokinetic cell all is the measurement unit that is used as electric weight with charge/discharge amount hourly (Ah), therefore preferred umber of pulse by the digital pulse signal in the statistics one hour, and according to the corresponding relation of frequency and electric current, estimate the residual capacity of electrokinetic cell.But, be understandable that, also can adopt other count cycles, and be not limited to one hour.
In sum; the present invention fully takes into account particular job environment of electrokinetic cell; voltage based on electrokinetic cell is that an output impedance is low; change very slowly signal; do not need very fast detection speed; according to such prerequisite, select the V/F transducer to substitute the A/D converter that conventional art uses, do like this to reach having the following advantages:
(1) it is few to take computational resource, only takies an input channel for a kind of simulating signal.
(2) good in anti-interference performance, because be by digital pulse signal is carried out the Residual capacity prediction that step-by-step counting realizes electrokinetic cell, so can avoid the environmental interference factor on estimation result's impact, advantage with accuracy height, fast response time can adapt to load current and change rapidly various application scenarios.
(3) but the signal frequency flexible choice, the counting of pulse signal normally can adopt vehicle-mounted microprocessor to finish, thereby can be according to the suitable V/F converter of the condition of work of microprocessor coupling, implementation is comparatively simple.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (6)
1. an electrokinetic cell Residual capacity prediction system is characterized in that, comprising:
One current-voltage converter, its input end connects the charge/discharge current of electrokinetic cell, is used for the charge/discharge current of electrokinetic cell is converted to an analog voltage signal;
One voltage-frequency converter, its input end links to each other with the output terminal of this current-voltage converter, be used for this analog voltage signal of this current-voltage converter output is converted to a digital pulse signal, this digital pulse signal is directly proportional with the charge/discharge current of electrokinetic cell; And
One microcontroller links to each other with the output terminal of this voltage-frequency converter, is used for the umber of pulse of the digital pulse signal of this voltage-frequency converter output of statistics within the count cycle, with the residual capacity of estimation electrokinetic cell.
2. electrokinetic cell Residual capacity prediction as claimed in claim 1 system, it is characterized in that, this microcontroller is added up the umber of pulse of the digital pulse signal of output in this voltage-frequency converter one hour, and according to the corresponding relation of the charge/discharge current of frequency, voltage and electrokinetic cell, the residual capacity of estimation electrokinetic cell.
3. electrokinetic cell Residual capacity prediction as claimed in claim 1 system is characterized in that this microcontroller is field programmable gate array or CPLD or micro-control unit.
4. an electrokinetic cell Residual capacity prediction method is characterized in that, may further comprise the steps:
The charge/discharge current of electrokinetic cell is converted to an analog voltage signal;
This analog voltage signal is converted to a digital pulse signal, and this digital pulse signal is directly proportional with the charge/discharge current of electrokinetic cell; And
The umber of pulse of this digital pulse signal of statistics within the count cycle is with the residual capacity of estimation electrokinetic cell.
5. electrokinetic cell Residual capacity prediction method as claimed in claim 4, it is characterized in that, be specially during the residual capacity of estimation electrokinetic cell: the umber of pulse of adding up the digital pulse signal of output in this voltage-frequency converter one hour, and according to the corresponding relation of the charge/discharge current of frequency, voltage and electrokinetic cell, the residual capacity of estimation electrokinetic cell.
6. electrokinetic cell Residual capacity prediction method as claimed in claim 4 is characterized in that, the umber of pulse that adopts field programmable gate array or CPLD or micro-control unit to add up this digital pulse signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666464A (en) * | 2021-01-27 | 2021-04-16 | 北京嘀嘀无限科技发展有限公司 | Battery health state prediction method and device, electronic equipment and readable storage medium |
| CN113507151A (en) * | 2021-07-07 | 2021-10-15 | 常州瑞华电力电子器件有限公司 | SoC cooperative control method applied to multiple energy storage units |
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| CN113507151A (en) * | 2021-07-07 | 2021-10-15 | 常州瑞华电力电子器件有限公司 | SoC cooperative control method applied to multiple energy storage units |
| CN113507151B (en) * | 2021-07-07 | 2024-02-09 | 常州瑞华电力电子器件有限公司 | SoC cooperative control method applied to multiple energy storage units |
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Application publication date: 20130320 |