CN106338646A - Automobile lead acid cell open-circuit voltage (OCV) calculation method and system - Google Patents
Automobile lead acid cell open-circuit voltage (OCV) calculation method and system Download PDFInfo
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- CN106338646A CN106338646A CN201610889516.5A CN201610889516A CN106338646A CN 106338646 A CN106338646 A CN 106338646A CN 201610889516 A CN201610889516 A CN 201610889516A CN 106338646 A CN106338646 A CN 106338646A
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- Prior art keywords
- acid battery
- lead
- circuit voltage
- open
- automobile
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
Abstract
The invention relates to an algorithm of electrical property parameters of an automobile lead acid cell, and especially relates to an automobile lead acid cell open-circuit voltage (OCV) calculation method and system. The method is not restricted to cell standing time, and since the technology is not affected by cell polar plate capacitance and self-discharge, when the method is used for calculating OCV, a cell does not have to stand for long time; and the precision of the OCV measured by use of the method provided by the technical scheme is high, and since temperature compensation is used and influences of cell internal capacitor and self-discharge are eliminated, the precision of the OCV calculated by use of the scheme is quite high.
Description
Technical field
The present invention relates to the algorithm of the electrology characteristic parameter of automobile lead-acid battery, more particularly, to a kind of automobile lead-acid battery is opened
The computational methods of road voltage and system.
Background technology
In automobile industry, open-circuit voltage (ocv) measuring method of lead-acid battery (soc) always is the focus neck of research
Domain, because ocv is a vital parameter calculating lead-acid battery electrology characteristic.And general measuring method is by such as
Inside battery equivalent circuit shown in Fig. 1, by battery standing more than four hours, measurement battery-end electricity after battery status is stable
Pressure obtains.This equivalent circuit is broadly divided into three parts: ohmage and two rc equivalent circuits.Cell voltage ubat can be by
Measurement obtains, and therefore can obtain following equation:
This equation can be changed as follows according to the time factor of rc circuit when on cell circuit, electric current is zero:
The major defect of this model is: after battery is installed on automobile, its electric current may be never zero.So above-mentioned side
Method can not be accurately obtained open-circuit voltage.
Content of the invention
The problem existing for prior art, now provides a kind of computational methods of automobile lead-acid battery open-circuit voltage and is
System.
Specific technical scheme is as follows:
A kind of computational methods of automobile lead-acid battery open-circuit voltage, comprising:
Step s1, the temperature of the voltage, the total current of output and lead-acid battery of lead-acid battery during collection automobile starting；
Step s2, the total current of the voltage according to described lead-acid battery and the output of described lead-acid battery calculates described lead-acid battery
Preliminary open-circuit voltage；
Step s3, the temperature of the described lead-acid battery according to collection carries out temperature-compensating calculating to described preliminary open-circuit voltage,
Export the open-circuit voltage of described lead-acid battery.
Preferably, specifically include in described step s2:
Step s21, is calculated to the preliminary open-circuit voltage of described lead-acid battery using microcontroller.
Preferably, specifically include in described step s3:
Step s31, carries out temperature-compensating calculating using microcontroller to described preliminary open-circuit voltage.
Preferably, described step s2 specifically includes:
Step s201, the total current of the voltage to described lead-acid battery and the output of described lead-acid battery carries out curve fitting, and generates
The VA characteristic curve of described lead-acid battery:；
Wherein, voltage is the voltage of described lead-acid battery, and i is the electric current of described lead-acid battery.
Preferably, also include after described step s201:
Step s202, i is substantially equal to 0, to obtain the preliminary open-circuit voltage of described lead-acid battery.
A kind of computing system of automobile lead-acid battery open-circuit voltage, comprising:
First acquisition module, the voltage of lead-acid battery during collection automobile starting；
Second acquisition module, the total current of described lead-acid battery output during collection automobile starting；
3rd acquisition module, the temperature of described lead-acid battery during collection automobile starting；
Computing module, connects described first acquisition module, described second acquisition module and described 3rd acquisition module respectively, in order to
The total current of the voltage according to described lead-acid battery and the output of described lead-acid battery calculates the preliminary open circuit electricity of described lead-acid battery
Pressure, and temperature-compensating calculating is carried out to described preliminary open-circuit voltage according to the temperature of the described lead-acid battery of collection, output
The open-circuit voltage of described lead-acid battery.
Preferably, described computing module is microcontroller.
Preferably, described microcontroller includes first processing units and the second processing being connected with described first processing units
Unit；
Wherein, described first processing units connect described first acquisition module, the second acquisition module, in order to according to described plumbic acid electricity
The total current of the voltage in pond and the output of described lead-acid battery calculates the preliminary open-circuit voltage of described lead-acid battery；
Described second processing unit connects described first processing units, described 3rd acquisition module, according to the described lead of collection
The temperature of sour battery carries out temperature-compensating calculating to described preliminary open-circuit voltage, exports the open-circuit voltage of described lead-acid battery.
Preferably, described computing unit is in order to the total current that the voltage of described lead-acid battery and described lead-acid battery are exported
Carry out curve fitting, generate the VA characteristic curve of described lead-acid battery.
Preferably, also in order to obtain in described VA characteristic curve, it is total that described lead-acid battery exports described computing unit
When electric current is substantially equal to 0, the preliminary open-circuit voltage of described lead-acid battery.
The beneficial effect of technique scheme is:
The method of technique scheme is not limited by the battery standing time, because this technology is not subject to battery pole plates electric capacity and certainly puts
The impact of electricity, calculates in this way and does not need battery to stand for a long time during ocv；Method using technique scheme records
Open-circuit voltage high precision, due to being affected using temperature-compensating and not by inside battery electric capacity and self discharge, so making
The ocv precision being calculated with the program is very high.
Brief description
Fig. 1 measures the inside battery equivalent circuit diagram of lead-acid battery open-circuit voltage for prior art；
Fig. 2 is a kind of flow chart of the embodiment of computational methods of present invention automobile lead-acid battery open-circuit voltage；
Fig. 3 is a kind of structural representation of the embodiment of computing system of present invention automobile lead-acid battery open-circuit voltage.
Specific embodiment
It should be noted that in the case of not conflicting, following technical proposals, can be mutually combined between technical characteristic.
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is further described:
As shown in Fig. 2 present embodiments providing a kind of computational methods of automobile lead-acid battery open-circuit voltage, comprising:
Step s1, the temperature of the voltage, the total current of output and lead-acid battery of lead-acid battery during collection automobile starting；
Step s2, the total current of the voltage according to lead-acid battery and lead-acid battery output calculates the preliminary open circuit electricity of lead-acid battery
Pressure；
Step s3, the temperature of the described lead-acid battery according to collection carries out temperature-compensating calculating to described preliminary open-circuit voltage,
Export the open-circuit voltage of described lead-acid battery.
First the data such as voltage during automobile starting, the total current of output, temperature are acquired in the present embodiment, pass through
The voltage collecting, current data are analyzed calculating, obtain preliminary open-circuit voltage (ocv), finally to preliminary electricity of opening a way
It is pressed into trip temperature and compensate the open-circuit voltage obtaining final lead-acid battery.
Preferably, specifically include in step s2:
Step s21, is calculated to the preliminary open-circuit voltage of lead-acid battery using microcontroller.
Preferably, specifically include in step s3:
Step s31, carries out temperature-compensating calculating using microcontroller to preliminary open-circuit voltage.
Microcontroller in above-described embodiment can be using high performance microcontroller (mcu) it is possible to make to calculate
During microcontroller be in low power consumpting state.
Preferably, step s2 specifically includes:
Step s201, the total current of the voltage to lead-acid battery and lead-acid battery output carries out curve fitting, and generates lead-acid battery
VA characteristic curve:；
Wherein, voltage is the voltage of lead-acid battery, and i is the electric current of lead-acid battery.
Preferably, also include after step s201:
Step s202, i is substantially equal to 0, to obtain the preliminary open-circuit voltage of lead-acid battery.
In above-described embodiment, gather cell voltage during automobile starting and battery output total current first, to collect
Automobile starting voltage, current data carry out curve fitting, and can obtain the VA characteristic curve of battery, its
In, voltage is the voltage of lead-acid battery, and i is the electric current of lead-acid battery.
By above-mentioned formula, when i level off to 0 when (now, lead-acid battery does not externally discharge, and is equivalent to battery open circuit), obtain
The voltage arriving is the preliminary open-circuit voltage (ocv) of lead-acid battery.That is:, finally calculated tentatively open
Road voltage carries out temperature-compensating, obtains the open-circuit voltage of lead-acid battery.
Based on above-described embodiment, present embodiments provide a kind of computing system of automobile lead-acid battery open-circuit voltage, such as Fig. 3
It is shown, comprising:
First acquisition module, the voltage of lead-acid battery during collection automobile starting；
Second acquisition module, the total current of lead-acid battery output during collection automobile starting；
3rd acquisition module, the temperature of lead-acid battery during collection automobile starting；
Computing module, connects the first acquisition module, the second acquisition module and the 3rd acquisition module, respectively in order to according to lead-acid battery
Voltage and the total current of lead-acid battery output calculate the preliminary open-circuit voltage of lead-acid battery, and according to the plumbic acid of collection electricity
The temperature in pond carries out temperature-compensating calculating, the open-circuit voltage of output lead-acid battery to preliminary open-circuit voltage.
The calculating of the open-circuit voltage of automobile lead-acid battery in the present embodiment, not by standing long-time to lead-acid battery
After measure its voltage and be worth to corresponding battery open circuit voltage.But by voltage during automobile starting, electric current, temperature data
Carry out unitary analysiss, trip temperature of going forward side by side compensates the open-circuit voltage obtaining battery.
Preferably, computing module is microcontroller.
Preferably, microcontroller includes first processing units and the second processing unit being connected with first processing units；
Wherein, first processing units connect the first acquisition module, the second acquisition module, in order to the voltage according to lead-acid battery and lead
The total current of sour battery output calculates the preliminary open-circuit voltage of lead-acid battery；
Second processing unit connects described first processing units, the 3rd acquisition module, the temperature of the lead-acid battery according to collection
Preliminary open-circuit voltage is carried out with temperature-compensating calculating, the open-circuit voltage of output lead-acid battery.
Preferably, computing unit is in order to carry out curve plan to the total current of the voltage of lead-acid battery and lead-acid battery output
Close, generate the VA characteristic curve of lead-acid battery.
Preferably, computing unit is also in order to obtain in VA characteristic curve, the total current infinite tendency of lead-acid battery output
When 0, the preliminary open-circuit voltage of lead-acid battery.
In above-described embodiment, preliminary opening is calculated by the current data of the voltage of the lead-acid battery of automobile starting, output
Road voltage, the method for the process VA characteristic curve described above matching of calculating, the present embodiment is not repeated；Basis opens afterwards
The battery temperature collecting when dynamic carries out temperature-compensating to above-mentioned calculated preliminary open-circuit voltage, obtains opening of lead-acid battery
Road voltage.
To sum up, the battery standing time is not limited the method for technique scheme, because this technology is not subject to battery pole plates
Electric capacity and the impact of self discharge, calculate in this way and do not need battery to stand for a long time during ocv；Using technique scheme
The high precision of open-circuit voltage that records of method, due to be not subject to the shadow of inside battery electric capacity and self discharge using temperature-compensating and
Ring, the ocv precision being calculated using the program is very high.
By explanation and accompanying drawing, give the exemplary embodiments of the ad hoc structure of specific embodiment, based on present invention essence
God, also can make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, after reading described above, various changes and modifications undoubtedly will be evident that.
Therefore, appending claims should regard whole variations and modifications of the true intention covering the present invention and scope as.In power
In the range of sharp claim, any and all scope of equal value and content, are all considered as still belonging to the intent and scope of the invention.
Claims (10)
1. a kind of computational methods of automobile lead-acid battery open-circuit voltage are it is characterised in that include:
Step s1, the temperature of the voltage, the total current of output and lead-acid battery of lead-acid battery during collection automobile starting；
Step s2, the total current of the voltage according to described lead-acid battery and the output of described lead-acid battery calculates described lead-acid battery
Preliminary open-circuit voltage；
Step s3, the temperature of the described lead-acid battery according to collection carries out temperature-compensating calculating to described preliminary open-circuit voltage,
Export the open-circuit voltage of described lead-acid battery.
2. the computational methods of automobile lead-acid battery open-circuit voltage according to claim 1 are it is characterised in that described step s2
In specifically include:
Step s21, is calculated to the preliminary open-circuit voltage of described lead-acid battery using microcontroller.
3. the computational methods of automobile lead-acid battery open-circuit voltage according to claim 1 are it is characterised in that described step s3
In specifically include:
Step s31, carries out temperature-compensating calculating using microcontroller to described preliminary open-circuit voltage.
4. the computational methods of automobile lead-acid battery open-circuit voltage according to claim 1 are it is characterised in that described step s2
Specifically include:
Step s201, the total current of the voltage to described lead-acid battery and the output of described lead-acid battery carries out curve fitting, and generates
The VA characteristic curve of described lead-acid battery:；
Wherein, voltage is the voltage of described lead-acid battery, and i is the electric current of described lead-acid battery.
5. the computational methods of automobile lead-acid battery open-circuit voltage according to claim 4 are it is characterised in that described step
Also include after s201:
Step s202, i is substantially equal to 0, obtaining the preliminary open-circuit voltage of described lead-acid battery it may be assumed that.
6. a kind of computing system of automobile lead-acid battery open-circuit voltage is it is characterised in that include:
First acquisition module, the voltage of lead-acid battery during collection automobile starting；
Second acquisition module, the total current of described lead-acid battery output during collection automobile starting；
3rd acquisition module, the temperature of described lead-acid battery during collection automobile starting；
Computing module, connects described first acquisition module, described second acquisition module and described 3rd acquisition module respectively, in order to
The total current of the voltage according to described lead-acid battery and the output of described lead-acid battery calculates the preliminary open circuit electricity of described lead-acid battery
Pressure, and temperature-compensating calculating is carried out to described preliminary open-circuit voltage according to the temperature of the described lead-acid battery of collection, output
The open-circuit voltage of described lead-acid battery.
7. the computing system of automobile lead-acid battery open-circuit voltage according to claim 6 is it is characterised in that described calculating mould
Block is microcontroller.
8. the computing system of automobile lead-acid battery open-circuit voltage according to claim 7 is it is characterised in that described microcontroller
Device includes first processing units and the second processing unit being connected with described first processing units；
Wherein, described first processing units connect described first acquisition module, the second acquisition module, in order to according to described plumbic acid electricity
The total current of the voltage in pond and the output of described lead-acid battery calculates the preliminary open-circuit voltage of described lead-acid battery；
Described second processing unit connects described first processing units, described 3rd acquisition module, according to the described lead of collection
The temperature of sour battery carries out temperature-compensating calculating to described preliminary open-circuit voltage, exports the open-circuit voltage of described lead-acid battery.
9. the computing system of automobile lead-acid battery open-circuit voltage according to claim 6 is it is characterised in that described calculating list
Unit, in order to carry out curve fitting to the total current of the voltage of described lead-acid battery and the output of described lead-acid battery, generates described plumbic acid
The VA characteristic curve of battery.
10. the computing system of automobile lead-acid battery open-circuit voltage according to claim 9 is it is characterised in that described calculating
Unit also in order to obtain in described VA characteristic curve, when the total current of described lead-acid battery output is substantially equal to 0, described lead
The preliminary open-circuit voltage of sour battery.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777505A (en) * | 2021-09-13 | 2021-12-10 | 深圳创维汽车智能有限公司 | Detection circuit and method for display screen battery |
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