CN104297695B - Detecting method for capacity of storage battery - Google Patents
Detecting method for capacity of storage battery Download PDFInfo
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- CN104297695B CN104297695B CN201410631450.0A CN201410631450A CN104297695B CN 104297695 B CN104297695 B CN 104297695B CN 201410631450 A CN201410631450 A CN 201410631450A CN 104297695 B CN104297695 B CN 104297695B
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Abstract
The invention discloses a detecting method for the capacity of a storage battery. The method comprises the following steps: applying double-pulse current signals to the storage battery, measuring the voltage response and a first derivative generated by the double-pulse current signals at different moments, calculating the change of the electromotive force of the power source of the storage battery and the capacitance and the resistance on a pole plate of the battery plate by using different formulas, and further calculating the capacity of the storage battery. Through the method, the double-pulse current signals are applied to both terminals of the storage battery, the capacity of the storage battery can be detected without discharge of the storage battery, and through certification, the detected result is accurate and reliable.
Description
Technical field
The present invention relates to a kind of detection method of accumulator capacity, the method does not need accumulator is carried out with electric discharge just can examine
Measure accumulator capacity.
Background technology
With the sternness further of the day by day in short supply of the energy and environmental pollution, electric automobile is special with its superior environmental protection and energy-conservation
Property, become auto industry research, exploitation and the focus using.One important motivity ingredient of electric automobile be battery and
Its charging module, the height of its technical merit has extremely important impact to the development of ev industry.
As the main flow battery of electric automobile, when determining its charging strategy, the capacity of accumulator itself has accumulator
Very important impact.So needing to determine accumulator capacity in its pre-charging stage.The detection method of traditional storage battery capacity
Need to carry out discharge test to accumulator, general operation is more complicated, and the required time is very long.
Content of the invention
The invention aims to overcoming deficiency of the prior art, a kind of detection method of accumulator capacity is proposed.
The method does not need battery discharging just can be detected accumulator capacity, and measurement is simple, and detection speed is fast, and is examined by multiple
Survey result more accurate.
For achieving the above object, the present invention is disclosed directly below technical scheme：
A kind of detection method of accumulator capacity is it is characterised in that comprise the steps：
(1) apply a pair of pulsed current signal to accumulator, the amplitude of dipulse current signal is I, and dipulse electric current is believed
Number dutycycle be 50%, the pulse width of dipulse current signal is T；Define the following moment：Initial time t0；Double arteries and veins
Rush current signal from the 0 moment t rising to I1；The moment t that dipulse current signal begins to decline from I2；Dipulse current signal
Drop to 0 moment t from I3；Dipulse current signal is again from the 0 moment t beginning to ramp up4；Dipulse current signal is again from 0
Rise to the moment t of I5；Dipulse current signal starts again at the moment t of decline6；
(2) measure t respectively0、t1、t2、t3、t4、t5、t6The each corresponding voltage response that moment dipulse current signal produces
Value E0、U1、U2、U3、U4、U5、U6And its corresponding first derivative dE0/dt0、dU1/dt1、dU2/dt2、dU3/dt3、dU4/dt4、
dU5/dt5、dU6/dt6；
(3) using the electric capacity on the electromotive force of source of different formulas calculating accumulator, accumulator plate and resistance：
1) electric capacity on accumulator plate is averaged by three calculating, and calculation equation is：
In formula：C1Represent t1Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
In formula：C2Represent t3Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
In formula：C3Represent t5Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
By the result of calculation of equation one, equation two and equation three, take its meansigma methods, obtain：
C=(C1+C2+C3)/3 equation four
The electric capacity C on accumulator plate can be accurately obtained according to equation four；
2) calculation equation of the resistance on accumulator plate is：
3) variable quantity of the electromotive force of source of accumulator is averaged by secondary calculating, and equation is：
In formula：ΔE1Represent t1Moment is to t2The variable quantity of the electromotive force of source of moment accumulator；
In formula：ΔE2Represent t5Moment is to t6The variable quantity of the electromotive force of source of moment accumulator；
The result of calculation of equation five and equation six is taken its meansigma methods, obtains:
Electromotive force of source variation delta E of accumulator can be accurately obtained according to equation eight；
(4) calculating accumulator capacity：
In formula：SOC represents accumulator capacity, E0Represent the initial electromotive force of accumulator, i.e. t0The magnitude of voltage that moment is surveyed,
U*Represent the specification voltage of accumulator, Δ U represents that accumulator is changed into the variable quantity of its electromotive force of source during sky electricity from Full Charge Capacity,
Its expression formula such as following formula：
In formula：AH represents the specification capacity of accumulator, and I represents the amplitude of dipulse current signal, and T represents dipulse electric current
The pulse width of signal.
Compared with prior art, the invention has the advantages that：
1., using directly applying dipulse current signal at accumulator two ends, measure the voltage response of its generation and single order is led
Number, then by can be calculated accumulator parameter, test process and calculating process all simple and fasts.
2. pass through to measure multiple not in the same time as a result, it is possible to multiple calculating accumulator parameter so that accumulator capacity
Testing result more accurate.
3. the present invention does not need accumulator to be carried out discharge just to detect its capacity, before and after accumulator testing, capacity is basic
Keep constant.
Brief description
Fig. 1 is the testing process schematic diagram of accumulator capacity of the present invention；
Fig. 2 is the schematic equivalent circuit of accumulator of the present invention；
Fig. 3 is the schematic diagram of dipulse current signal of the present invention；
Fig. 4 is the battery tension characteristic curve schematic diagram of present invention detection；
Fig. 5 is embodiment of the present invention detection structural representation.
Specific embodiment
Below in conjunction with the accompanying drawings, embodiments of the present invention are described in detail, it is to be understood that the protection model of the present invention
Enclose and do not limited by specific embodiment.
The flow process of the detection method of accumulator capacity of the present invention is as shown in Figure 1：
(1) apply a pair of pulsed current signal to accumulator, define wherein several moment；
(2) the measurement voltage response that this dipulse current signal does not produce in the same time and its first derivative；
(3) according to the measurement result in step (2), using the electromotive force of source of different formulas calculating accumulator, accumulator
Electric capacity on pole plate and resistance；
(4) according to the electric capacity on the electromotive force of source of the accumulator obtained by step (1) to (3), accumulator plate and electricity
The result calculating accumulator capacity of resistance.
The electrophysics characteristic being had in itself due to accumulator, can be by equivalent for accumulator electricity becoming shown in Fig. 2
Road.In Fig. 2, E represents storage battery kinetic potential, R1Represent the conducting resistance of accumulator, R2Represent the resistance on accumulator plate, C generation
Electric capacity on watch battery pole plate.From the electrochemical properties of accumulator, deposit between accumulator capacity and above several parameter
In certain corresponding relation.
As shown in figure 1, (1) applies a pair of pulsed current signal, several moment of definition to accumulator：Initial time t0；
Dipulse current signal is from the 0 moment t rising to I1；The moment t that dipulse current signal begins to decline from I2；Dipulse electric current
Signal drops to 0 moment t from I3；Dipulse current signal is again from the 0 moment t beginning to ramp up4；Dipulse current signal is again
The secondary moment t rising to I from 05；Dipulse current signal starts again at the moment t of decline6；As shown in Figure 3.
(2) using detecting the voltage response and its first derivative not produced in the same time, voltage as shown in Figure 4 can be drawn
Current characteristic curve schematic diagram.
(3) calculation equation of the electric capacity on accumulator plate is：
In formula：C1Represent the electric capacity on accumulator plate, I represents the amplitude of current impulse, dU1/dt1Represent t1Moment institute
Survey the first derivative values of voltage.
In formula：C2Represent the electric capacity on accumulator plate, I represents the amplitude of current impulse,Represent t2Moment surveyed electricity
The first derivative of pressure,Represent t3The first derivative values of moment surveyed voltage.
In formula：C3Represent the electric capacity on accumulator plate, I represents the amplitude of current impulse,Represent t4Moment surveyed electricity
The first derivative of pressure,Represent t5The first derivative values of moment surveyed voltage.
According to the result of calculation of equation one, equation two and equation three, take its meansigma methods, expression formula is as follows：
C=(C1+C2+C3)/3...... equation four
In formula：C represents the meansigma methodss of the electric capacity on accumulator plate, C1、C2、C3Represent respectively according to not survey in the same time
The electric capacity on accumulator plate that amount result is calculated.
The electric capacity C on accumulator plate can be accurately obtained according to equation four.
The calculation equation of the resistance on accumulator plate is：
In formula：R represents the resistance on accumulator plate, U3Represent t3The voltage that moment is surveyed, U4Represent t4Moment is surveyed
Voltage, I represents the amplitude of current impulse, and C represents the electric capacity on accumulator plate,Represent t2The single order of moment surveyed voltage
Derivative,Represent t4The first derivative values of moment surveyed voltage.
According to the result of calculation of equation five, the resistance R on accumulator plate can be obtained.
The calculation equation of the variable quantity of the electromotive force of source of accumulator is：
In formula：ΔE1Represent the variable quantity of the electromotive force of source of accumulator, U1Represent t1The magnitude of voltage that moment is surveyed, U2Table
Show t2The magnitude of voltage that moment is surveyed, I represents the amplitude of current impulse, and C represents the electric capacity on accumulator plate, and R represents accumulator
Resistance on pole plate,Represent t2The first derivative values of moment surveyed voltage.
In formula：ΔE2Represent the variable quantity of the electromotive force of source of battery, U5Represent t5The magnitude of voltage that moment is surveyed, U6Represent t6
The magnitude of voltage that moment is surveyed, C represents the electric capacity on battery pole plates, and R represents the resistance on battery pole plates,Represent t5Moment institute
Survey the first derivative of voltage,Represent t6The first derivative of moment surveyed voltage.
According to the result of calculation of equation five and equation six, take its meansigma methods, expression formula is as follows:
In formula：Δ E represents the meansigma methodss of the electromotive force of source variable quantity of accumulator, Δ E1、ΔE2Represent respectively according to difference
The electromotive force of source variable quantity of the accumulator that the measurement result in moment is calculated.
Electromotive force of source variation delta E of accumulator can be accurately obtained according to equation eight.
Pass between resistance on the electromotive force of source variable quantity of accumulator capacity and accumulator, accumulator plate and electric capacity
System can be calculated by following equation：
In formula：SOC represents accumulator capacity, E0Represent the initial electromotive force of accumulator, i.e. t0The magnitude of voltage that moment is surveyed,
Δ E represents the electromotive force of source variable quantity of accumulator, U*Represent the specification voltage of accumulator, Δ U represents accumulator by Full Charge Capacity
It is changed into the variable quantity of its electromotive force of source during sky electricity, its expression formula such as following formula：
In formula：Δ E represents the electromotive force of source variable quantity of accumulator, and AH represents the specification capacity of accumulator, and I represents double arteries and veins
Rush the amplitude of current signal, T represents the pulse width of dipulse current signal.
Therefore, accumulator capacity can be accurately obtained using equation nine and equation ten.The present invention utilizes multiple measurement knot
Fruit is so that the testing result of last accumulator capacity is more accurate.
Fig. 5 is a kind of measurement structure for detection method of accumulator capacity of the present invention, and those skilled in the art are using existing
There is technology can realize.
In order to prove correctness and its performance of the inventive method, with the inventive method, one accumulator capacity is carried out first
Detection, is then discharged to accumulator, is detected the capacity of this accumulator using traditional method, finally compare two methods
Testing result, finds that the testing result of the inventive method is identical with the testing result of traditional method.
Claims (1)
1. a kind of detection method of accumulator capacity is it is characterised in that comprise the steps：
(1) apply a pair of pulsed current signal to accumulator, the amplitude of dipulse current signal is I, dipulse current signal
Dutycycle is 50%, and the pulse width of dipulse current signal is T；Define the following moment：Initial time t0；Dipulse electricity
Stream signal is from the 0 moment t rising to I1；The moment t that dipulse current signal begins to decline from I2；Dipulse current signal is from I
It is reduced to 0 moment t3；Dipulse current signal is again from the 0 moment t beginning to ramp up4；Dipulse current signal is again from 0 rising
Moment t for I5；Dipulse current signal starts again at the moment t of decline6；
(2) measure t respectively0、t1、t2、t3、t4、t5、t6Each corresponding voltage response value E that moment dipulse current signal produces0、
U1、U2、U3、U4、U5、U6And its corresponding first derivative dE0/dt0、dU1/dt1、dU2/dt2、dU3/dt3、dU4/dt4、dU5/dt5、
dU6/dt6；
(3) using the electric capacity on the electromotive force of source of different formulas calculating accumulator, accumulator plate and resistance：
1) electric capacity on accumulator plate is averaged by three calculating, and calculation equation is：
In formula：C1Represent t1Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
In formula：C2Represent t3Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
In formula：C3Represent t5Electric capacity on moment accumulator plate, I represents the amplitude of current impulse；
By the result of calculation of equation one, equation two and equation three, take its meansigma methods, obtain：
C=(C1+C2+C3)/3 equation four
The electric capacity C on accumulator plate can be accurately obtained according to equation four；
2) calculation equation of the resistance on accumulator plate is：
3) variable quantity of the electromotive force of source of accumulator is averaged by secondary calculating, and equation is：
In formula：ΔE1Represent t1Moment is to t2The variable quantity of the electromotive force of source of moment accumulator；
In formula：ΔE2Represent t5Moment is to t6The variable quantity of the electromotive force of source of moment accumulator；
The result of calculation of equation five and equation six is taken its meansigma methods, obtains:
Electromotive force of source variation delta E of accumulator can be accurately obtained according to equation eight；
(4) calculating accumulator capacity：
In formula：SOC represents accumulator capacity, E0Represent the initial electromotive force of accumulator, i.e. t0The magnitude of voltage that moment is surveyed, U*Table
Show the specification voltage of accumulator, Δ U represents that accumulator is changed into the variable quantity of its electromotive force of source during sky electricity from Full Charge Capacity, its table
Reach formula such as following formula：
In formula：AH represents the specification capacity of accumulator, and I represents the amplitude of dipulse current signal, and T represents dipulse current signal
Pulse width.
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| JPS6415679A (en) * | 1987-11-19 | 1989-01-19 | Hitachi Maxell | Battery capacity display method |
| CN1437031A (en) * | 2002-02-08 | 2003-08-20 | 上海华谊（集团）公司 | Battery capacity measuring method |
| JP2012163458A (en) * | 2011-02-07 | 2012-08-30 | Sharp Corp | Coulomb counter and electronic information apparatus |
| CN103128060A (en) * | 2011-11-30 | 2013-06-05 | 哈尔滨智木科技有限公司 | Battery impulse volt-ampere sorting method |
| CN104007395A (en) * | 2014-06-11 | 2014-08-27 | 北京交通大学 | Lithium ion battery charge state and parameter adaptive joint estimation method |
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2014
- 2014-11-11 CN CN201410631450.0A patent/CN104297695B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6415679A (en) * | 1987-11-19 | 1989-01-19 | Hitachi Maxell | Battery capacity display method |
| CN1437031A (en) * | 2002-02-08 | 2003-08-20 | 上海华谊（集团）公司 | Battery capacity measuring method |
| JP2012163458A (en) * | 2011-02-07 | 2012-08-30 | Sharp Corp | Coulomb counter and electronic information apparatus |
| CN103128060A (en) * | 2011-11-30 | 2013-06-05 | 哈尔滨智木科技有限公司 | Battery impulse volt-ampere sorting method |
| CN104007395A (en) * | 2014-06-11 | 2014-08-27 | 北京交通大学 | Lithium ion battery charge state and parameter adaptive joint estimation method |
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