CN1136457C - Automatic sampling correction method for voltage of battery - Google Patents
Automatic sampling correction method for voltage of battery Download PDFInfo
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- CN1136457C CN1136457C CNB99117125XA CN99117125A CN1136457C CN 1136457 C CN1136457 C CN 1136457C CN B99117125X A CNB99117125X A CN B99117125XA CN 99117125 A CN99117125 A CN 99117125A CN 1136457 C CN1136457 C CN 1136457C
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- voltage
- battery
- charging
- sampling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The present invention relates to an automatic calibration method for sampling the voltage of a battery, which belongs to the field of electronic technology detection. The present invention is suitable for sampling the voltage of a nickel-cadmium battery, a nickel-hydrogen battery and a lithium ion battery by a two bilinear method or a trilinear method in the process of charging and discharging. The present invention is characterized in that voltage sampling automatic calibration can be realized completely by the processing of a computer software. Under the condition that a hardware is not altered, the present invention increases the voltage sampling precision, is convenient and flexible to use, and greatly improves the cost performance of equipment.
Description
The present invention relates to a kind of fully by software realization battery voltage sampling Calibration Method, this method is applicable to that nickel-cadmium battery, Ni-MH battery and lithium ion battery adopt two line method or the voltage sample of trilinear method anchor clamps in charge and discharge process, be applied on the secondary battery capacity sorting checkout equipment, belong to the electronic technology detection range.
At present, to the capacity screening installation of nickel-cadmium battery, Ni-MH battery and lithium ion battery, mainly adopt two line method, trilinear method and three kinds of methods of four-wire method to carry out voltage sample.Wherein the voltage sample precision of four-wire method is the highest, but has the relatively poor limitation such as (batteries that can not sorting has the plastic foreskin packing) of hardware cost higher (circuit complicated), adaptability.For the capacity screening installation that adopts two line method and trilinear method, circuit is simple, adaptability is strong, but the voltage sample precision is relatively poor, causes capacity sorting accuracy to reduce.For two line method and trilinear method, the main cause that influences the voltage sample precision is to exist contact resistance to cause pressure drop between anchor clamps and battery, and the size of contact resistance has instability, when the surface of contact of anchor clamps cleans to such an extent that hold tightly than clean or anchor clamps, contact resistance is less, when unclean or anchor clamps hold pine when the surface of contact of anchor clamps, contact resistance increases, the different anchor clamps of same capacity screening installation have different contact resistances again, if be infeasible by increasing and decreasing the method that a fixing voltage difference reaches voltage calibration simply.
The object of the invention provides a kind of by the automatic Calibration Method of software realization battery voltage sampling, can eliminate the voltage sample error that the reason of this respect causes fully, the advantage that had both kept two line method, trilinear method, eliminate their inherent errors in hardware circuit principle again, thereby improved the ratio of performance to price of equipment.
As Fig. 2, battery is equivalent to resistance R of a desirable constant pressure source series connection
N, the contact resistance between anchor clamps and battery is equivalent to a resistance R
J, the virtual voltage when supposing the battery bringing onto load is designated as V
0, sampled voltage is designated as V
1, the zero current sampled voltage is V
2, the contact resistance pressure drop is designated as V
J, internal resistance of cell pressure drop is designated as V
NFor charging process, can set up following relational expression: (1) V
0=V
1-V
J, (2) V
2=V
0-V
N=V
1-V
J-V
N, (3) V
N=R
NI
C, (4) V
J=V
1-V
2-V
N=V
1-V
2-R
NI
CBy (4) formula V as can be known
JEqual bringing onto load sampled voltage V
1With zero current sampled voltage V
2Difference deduct internal resistance of cell pressure drop V again
N, by (3) formula internal resistance of cell pressure drop V as can be known
NEqual internal resistance of cell R
NMultiply by charging current I
C, calculate V
JAfter can obtain battery virtual voltage V by (1) formula again
0, because at the V in the testing process that discharges and recharges with a collection of battery
JBe basicly stable constant, therefore measure V
JAfter, with its preservation, patrol and examine in each later on charging testing process and gather cell voltage V
1, again with V
JJust subtract each other and to obtain V
0In like manner, for discharge process, discharge current I
FThe direction that flows through circuit is opposite with charging process, can set up following relational expression: (5) V
0=V
1+ V
J, (6) V
2=V
0+ V
N=V
l+ V
J+ V
N, (7) V
N=R
NI
F, (8) V
J=V
2-V
1-V
N=V
2-V
1-R
NI
FBy (8) formula V as can be known
JCurrent sample voltage V equals zero
2With bringing onto load sampled voltage V
1Difference deduct internal resistance of cell pressure drop V again
N, by (7) formula internal resistance of cell pressure drop V as can be known
NEqual internal resistance of cell R
NMultiply by discharge current I
F, calculate V
JAfter can obtain battery virtual voltage V by (5) formula again
0, measure V
JAfter, with its preservation, later on each discharge examination process is patrolled and examined and is gathered cell voltage V
1, again with V
JAddition obtains V
0
Advantage of the present invention: 1, can reduce cost, use software to realize the calibration of cell voltage automatic voltage, can reach the equal even better effect of change hardware circuit (changing four-wire method into), the ratio of performance to price is improved; 2, automaticity height, the influence that can avoid operator's human factor that battery voltage sampling is caused; 3, applicability is strong, is applicable to the secondary battery capacity screening installation of any employing two line method and trilinear method.
The synoptic diagram of Fig. 1, battery of the present invention the two poles of the earth voltage sample
The equivalent electrical circuit of Fig. 2, bringing onto load charging process voltage sample of the present invention
The equivalent electrical circuit of Fig. 3, bringing onto load discharge process voltage sample of the present invention
The equivalent electrical circuit of Fig. 4, zero current voltage sample of the present invention
Fig. 5, the automatic calibration software process flow diagram of voltage sample of the present invention
Fig. 6, present embodiment charging process battery runs down transient voltage-time plot
Fig. 7, present embodiment discharge process battery runs down transient voltage-time plot
Charging and discharging curve before Fig. 8, the present invention use
Charging and discharging curve after Fig. 9, the present invention use
Below in conjunction with description of drawings specific embodiments of the present invention:
Computing machine is sampled to cell voltage according to Fig. 5 flowcharting software.R
N, I
C, I
FSend to next bit computer by host computer, the voltage V during next bit computer elder generation once sampling bringing onto load
1, then with transient state with this road failure of current, in 2ms, measure a zero current cell voltage V fast
2Obtain V by (4) or (8) formula
J, with V
JPreservation is got up, and measures V later at every turn
1After with itself and V
JAddition or subtract each other and to obtain battery virtual voltage V
0, finish the automatic calibration process of entire cell voltage sample.In order to determine the accuracy of zero current sample mode, the spy does following test, relatively battery runs down transient voltage situation of change.Adopt AA type battery to be discharge outage test, internal resistance of cell R
N=17m Ω, actual measurement contact resistance pressure drop V
J=3.5mV, discharge current I
F=1000mA, sampling time interval t=100 μ S measures battery runs down transient voltage time curve as shown in Figure 6.Among Fig. 6, V
1=1.208V, V
2=1.229V, R
N=17m Ω, I
F=1000mA, as calculated, V
J=V
2-V
1-V
N=V
2-V
1-R
NI
F=1.229-1.208-0.017 * 1=0.004V=4mV.Identical charging outage test, the electric current I done of other conditions
C=1000mA measures battery runs down transient voltage time curve as shown in Figure 7.Among Fig. 7, V
1=1.344V, V
2=1.323V, R
N=17m Ω, I
C=1000mA, as calculated, V
J=V
1-V
2-V
N=V
1-V
2-R
NI
C=1.344-1.323-0.017 * 1=0.004V=4mV.The contact resistance pressure drop that evidence, zero current sample mode are measured equates substantially that with the pressure drop of actual measurement contact resistance accuracy is very high.Fig. 8, Fig. 9 are discharging and recharging in " BS-9000 secondary cell automatic detection device " under the situation of conditionally complete unanimity use the detection data before and after the present invention with a collection of Ni-MH battery.Experimental result shows, before use the inventive method, because contact resistance causes the voltage sample error, the charging and discharging curve consistance of battery is relatively poor, and after use the inventive method, contact resistance causes the voltage sample error concealment, the charging and discharging curve consistance of battery is better, and effect is obvious.Hence one can see that, and the present invention can overcome two line method and the trilinear method defective on voltage sample fully, fills up this vacancy on the one hand, and the capacity screening installation is further enhanced on performance index.
Claims (1)
1, a kind of automatic sampling correction method for voltage of battery, nickel-cadmium battery, Ni-MH battery and lithium ion battery are adopted two line method or the voltage sample of trilinear method anchor clamps in charge and discharge process, it is characterized in that adopting the software processing method, 1. in charging process, adopt following relational expression: (1) V
0=V
1-V
J, (2) V
2=V
0-V
N=V
1-V
J-V
N, (3) V
N=R
NI
C, (4) V
J=V
1-V
2-V
N=V
1-V
2-R
NI
CComputing machine is to bringing onto load charging voltage V
1, zero current voltage V
2Sampling is then according to charging current I
C, calculate V
N, calculate contact resistance pressure drop V again
J, with V
1With V
JSubtract each other the virtual voltage V when drawing the charging of battery bringing onto load
02. in discharge process, adopt following relational expression: (5) V
0=V
1+ V
J, (6) V
2=V
0+ V
N=V
1+ V
J+ V
N, (7) V
N=R
NI
F, (8) V
J=V
2-V
1-V
N=V
2-V
1-R
NI
FComputing machine is to bringing onto load sparking voltage V
1, zero current voltage V
2Sampling is then according to discharge current I
F, calculate V
N, calculate contact resistance pressure drop V again
J, with V
1With V
JAddition, the virtual voltage V when drawing the discharge of battery bringing onto load
0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB99117125XA CN1136457C (en) | 1999-10-07 | 1999-10-07 | Automatic sampling correction method for voltage of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB99117125XA CN1136457C (en) | 1999-10-07 | 1999-10-07 | Automatic sampling correction method for voltage of battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1291724A CN1291724A (en) | 2001-04-18 |
| CN1136457C true CN1136457C (en) | 2004-01-28 |
Family
ID=5279771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB99117125XA Expired - Fee Related CN1136457C (en) | 1999-10-07 | 1999-10-07 | Automatic sampling correction method for voltage of battery |
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| Country | Link |
|---|---|
| CN (1) | CN1136457C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221225B (en) * | 2008-01-24 | 2010-06-02 | 中兴通讯股份有限公司 | Calibration method and device for battery voltage sampling |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426620C (en) * | 2005-03-25 | 2008-10-15 | 苏州星恒电源有限公司 | Resistance calibrating method for lithium charge cell equalizing circuit |
| CN101581766A (en) * | 2008-05-15 | 2009-11-18 | 深圳市比克电池有限公司 | Method for detecting invalid detecting point of cell detecting cabinet |
| CN101713794B (en) * | 2009-10-23 | 2012-09-05 | 广州蓝奇电子实业有限公司 | Method for detecting poor contact of battery voltage testing terminals |
| CN102929318B (en) * | 2011-08-09 | 2015-12-09 | 上海松下微波炉有限公司 | The cooking voltage calibration method of micro-wave oven |
| CN103837829B (en) * | 2012-11-27 | 2016-08-31 | 上海航天有线电厂 | A kind of intelligent compensation twin wire power lithium-ion battery measures system |
| DE102014220079A1 (en) * | 2014-10-02 | 2016-04-07 | Robert Bosch Gmbh | Method for calibrating a sensor of a battery management system |
| CN104410111B (en) * | 2014-11-03 | 2017-03-29 | 惠州市亿能电子有限公司 | Voltage acquisition line impedence backoff algorithm on battery management system |
| CN105021865B (en) * | 2015-06-04 | 2017-12-01 | 深圳市芯海科技有限公司 | A kind of compensable voltage measurement method |
| CN107121656A (en) * | 2017-04-28 | 2017-09-01 | 茂硕电源科技股份有限公司 | A kind of power supply automatic calibrating method and device |
| CN108845265A (en) * | 2018-06-22 | 2018-11-20 | 广州极飞科技有限公司 | Battery modules and voltage detection method, electrical equipment based on it |
-
1999
- 1999-10-07 CN CNB99117125XA patent/CN1136457C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221225B (en) * | 2008-01-24 | 2010-06-02 | 中兴通讯股份有限公司 | Calibration method and device for battery voltage sampling |
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| Publication number | Publication date |
|---|---|
| CN1291724A (en) | 2001-04-18 |
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