CN100344984C - Method for detecting internal resistance of accumulator through electromagnetic discharge - Google Patents
Method for detecting internal resistance of accumulator through electromagnetic discharge Download PDFInfo
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- CN100344984C CN100344984C CNB2005100282121A CN200510028212A CN100344984C CN 100344984 C CN100344984 C CN 100344984C CN B2005100282121 A CNB2005100282121 A CN B2005100282121A CN 200510028212 A CN200510028212 A CN 200510028212A CN 100344984 C CN100344984 C CN 100344984C
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Abstract
The present invention relates to a method used for detecting internal resistor of an accumulator through electromagnetic discharge, which belongs to the technical field of industry detection and control. The present invention comprises the following steps: (1) A inductance L, a resistor R and a switch S are connected in parallel to both ends of an accumulator after the inductance L, the resistor R and the switch S are connected in series, when t is equal to zero, the switch S is closed, the accumulator is discharged by L, R and internal resistor r of the accumulator through S, discharge current is gradually increased following the increase of the discharge time, and simultaneously, instantaneous values of discharge current i (t) and terminal voltage u (t) of the accumulator are endlessly measured to obtain a series of data [i (1), u (1)], [i (2), u (2)],..., [i (n), u (n)]; (2) data are processed: two electrical signals of the terminal voltage of the accumulator and the discharge current are sampled with high speed and measured, the value of the internal resistor r of the accumulator is worked out according to a series of data [i (k), u (k)](K is equal to 1 2...,..., n) which are measured, and a curve fitted method is adopted. The present invention has the advantages of simple structure, can realize the online monitoring and off-line measurement to the internal resistance of the accumulator.
Description
Technical field
What the present invention relates to is a kind of detection method that belongs to the industrial measurement and control technical field, specifically, is a kind of method that detects accumulator internal resistance by inductive discharge.
Background technology
Accumulator widespread use in industry, traffic, communications industry, as the main power supply or the standby power supply of equipment, to be powered equipment safe, reliably move most important.Therefore, the staff is very to be concerned about to the performance of accumulator.Judging accumulator property with the internal resistance detection method, realize the on-line maintenance of accumulator, is one of preferred plan of generally acknowledging at present.By the online detection of internal resistance can make the staff carry out early accumulator maintenance, more change jobs, guarantee to be powered device security, operation reliably.Therefore to the detection, particularly on-line monitoring of accumulator internal resistance, has important and practical meanings.Detection to accumulator internal resistance is the process of a more complicated, and common methods mainly contains at present: densimetry, open-circuit voltage method, direct-current discharge method and AC signal injection method.Densimetry is estimated the internal resistance of accumulator by the density of measuring battery liquid, is usually used in the internal resistance measurement of open type lead-acid battery, and the colloid storage battery that is not suitable for using always and the internal resistance of sealed lead acid storage battery detect.The open-circuit voltage method is estimated accumulator internal resistance by the terminal voltage of measuring accumulator, and precision is very poor, even derives a wrong conclusion.Direct-current discharge method and AC signal injection method are present more common methods.The direct-current discharge method is the method that proposes in the IEC896.2-1995 standard, by the heavy-current discharge that accumulator is carried out vary in size for 2 times, measures the voltage drop on the accumulator, calculates the internal resistance of cell by Ohm law.The direct-current discharge method must could realize measuring under the state of static state or off line, can't really realize the on-line measurement of accumulator; There is infringement in the discharge of big electric current to accumulator, if be frequent the measuring of monitoring accumulator, will accumulate the infringement of accumulator, influences the capacity and the life-span of accumulator on the contrary; The measuring repeatability of DC-method is the bottleneck of puzzlement DC-method development always, and the general measure cycle is more than one month, even reaches 1 year.
Find by prior art documents, Li Liwei, Zou Jiyan are " based on the research of the accumulator internal resistance measurement mechanism of AC measurment method " (" measuring and equipment ", 2002 12 phases, pp15-17) mention the AC signal injection method, apply one by accumulators and exchange the little current signal of low frequency, measure the low-frequency voltage at accumulator two ends and the low-frequency current that flows through and both phase differential, thereby calculate the internal resistance of accumulator.Because the existence of straight-flow system bus and feed cable distributed capacitance, and distributed capacitance is difference with the difference of straight-flow system capacity, the on-the-spot characteristics of power supply, distributed capacitance has played shunting action to the low-frequency current signal that applies, the monitoring resolution of the internal resistance of cell is reduced greatly, and the low-frequency current signal that applies also is an interference source concerning straight-flow system.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of method by inductive discharge detection accumulator internal resistance is provided, make it simple in structure, realize on-line monitoring and off-line measurement accumulator internal resistance.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
1, the collection of discharge and voltage and current signal:
The two ends that are connected in parallel on accumulator after inductance L, resistance R and the switch S series connection, the internal resistance of accumulator is r.The t=0 moment, the switch S closure, accumulator is discharged by L, R, r by S, discharge current is along with the growth of time increases gradually, simultaneously, constantly measure the instantaneous value of discharge current i (t) and accumulator voltage u (t), obtain a series of [i (1), u (1)], [i (2), u (2)] ... [i (n), u (n)] data.
When switch S is closed, be equivalent to a step signal is acted on the RL series circuit, circuit is in firstorder circuit zero state response state, and accumulator is by resistance and inductive discharge, and this moment, the differential equation of circuit was:
Separate this differential equation, can obtain the discharge current i in the inductance
L:
As seen this electric current is an amount that changes according to index law in time.
The pass of accumulator voltage and total discharge current is:
u＝E-r·i (3)
2, the processing of data:
According to a series of [i (1), the u (1)] that measure, [i (2), u (2)] ..., [i (n), u (n)] data, the method for employing curve fitting is calculated accumulator internal resistance r.
According to formula (3), the terminal voltage of accumulator and discharge current are carried out twice measurement at the different time of discharge just can system of equations about accumulator electromotive force E and accumulator internal resistance r of simultaneous, thereby solve accumulator internal resistance, this is equivalent to the one-shot measurement to accumulator internal resistance.
From the angle of measuring, may there be bigger error in single measurement, and obtain comparatively accurate result can take multiple measurements, and then measurement result is carried out suitable data processing.For accumulator, under the situation of a series of different discharge currents, its total discharge current and corresponding terminal voltage are measured, the result who obtains like this can reflect the situation of accumulator internal resistance more accurately.
Terminal voltage and these two electric signal of discharge current to accumulator carry out the high-speed sampling measurement, and we can obtain the data of a series of accumulator voltage and corresponding discharge current.If according to a series of data that obtain is being that horizontal ordinate, accumulator voltage are the data point of retouching out accumulator voltage u (t), discharge current i (t) in the rectangular coordinate system of ordinate with the discharge current, and be linked to be line, in the ideal case, this line should be straight line, and the slope of this straight line is the size of accumulator internal resistance.
In the reality, have error inevitably owing to measure, actual data point can not just in time be in a straight line.We do suitable data processing to a series of data that obtain, when sampling number less (5-10 sampled point), adopt method of average deal with data, when sampling number moderate (11-50 sampled point), adopt the Least Square in Processing data, when sampling number more (50 more than the sampled point), adopt the method deal with data of maximal possibility estimation, can get rid of in the measuring process some like this and disturb and the influence of accidentalia, improve the precision and the feasible degree of measurement with respect to additive method effectively.
Among the present invention the discharge time of accumulator short, and the discharge period is controlled, to the capacity of accumulator and performance almost without any influence; The discharge current of accumulator is the electric current of an ascending variation, and what measurement result was reacted is the comprehensive condition of the internal resistance that reflect of accumulator under different discharge currents, so the result has higher credibility.The present invention can be applied to all occasions that need carry out off-line, online detection, monitoring to accumulator internal resistance, the occasion that needs battery pack as standby power supply etc. battery condition extremely to be concerned about as machine room of battery management, telecommunication center and the bank of the battery management of electric power direct current cabinet, electric automobile, ocean beacon etc.
Embodiment
Embodiment
1, the collection of discharge and voltage and current signal
Measurand is 12V, the 20Ah valve-regulated lead-acid battery.
Gauge tap S should adopt the full-control type power electronic switching device, can freely control the zero hour and the discharge period of battery discharging.Be the influence of avoiding discharging to accumulator capacity and life-span, the maximum current of discharge is unsuitable excessive, and the discharge period also should not be long simultaneously, can be in the millisecond magnitude, as 5ms.
Resistance R need not artificially be provided with, and it is lead resistance, inductance leads resistance and various contact resistance sum, and its size is generally the milliohm magnitude in the side circuit, gets 20 milliohms.
The size of discharge inductance L is the magnetic core inductance of 5mH.
Calculate as can be known according to (2) formula, the discharge current of accumulator was 11.9A when discharge finished, and once the electric weight of discharge release is 0.0298 coulomb, only accounts for 4 * 10 of the total discharge capacity of accumulator
-7, therefore to the capacity of accumulator and performance without any adverse influence.
Adopt high-precision AD converter discharge current i (t), terminal voltage u (t) signal to be sampled with sampling rate at a high speed.In the time of 5ms, can obtain the data of hundreds of time points.
2, the processing of data
For the data of the hundreds of points that obtain, adopt least square fitting to go out straight line, the slope that calculates straight line is 1.12 * 10
-2, i.e. the internal resistance of tested accumulator is 11.2 milliohms.
With respect to other technologies, among the present invention the discharge time of accumulator short, and the discharge period is controlled, to the capacity of accumulator and performance almost without any influence; The measuring method that is different from other is only measured under 1,2 different working current accumulator, the discharge current of accumulator is the electric current of an ascending variation among the present invention, what measurement result was reacted is the comprehensive condition of the internal resistance that reflect of accumulator under different discharge currents, so the result has higher credibility.
The present invention can be applied to all occasions that need carry out off-line, online detection, monitoring to accumulator internal resistance, the occasion that needs battery pack as standby power supply etc. battery condition extremely to be concerned about as machine room of battery management, telecommunication center and the bank of the battery management of electric power direct current cabinet, electric automobile, ocean beacon etc.
Claims (3)
1. the method by inductive discharge detection accumulator internal resistance is characterized in that, may further comprise the steps:
(1) collection of discharge and voltage and current signal:
The two ends that are connected in parallel on accumulator after inductance L, resistance R and the switch S series connection, the t=0 moment, switch S closure, accumulator is discharged by L, R and accumulator internal resistance r by S, and discharge current is along with the growth of time increases gradually, simultaneously, constantly measure the instantaneous value of discharge current i (t) and accumulator voltage u (t), obtain a series of [i (1), u (1)], [i (2), u (2)],, [i (n), u (n)] data;
(2) processing of data:
Terminal voltage and these two electric signal of discharge current to accumulator carry out the high-speed sampling measurement, according to a series of [i (1), the u (1)] that measure, [i (2), u (2)] ..., [i (n), u (n)] data, the method for employing curve fitting is calculated accumulator internal resistance r.
2. according to claim 1ly detect the method for accumulator internal resistance by inductive discharge, it is characterized in that, the pass of described accumulator voltage and total discharge current is: u=E-ri, E are the accumulator electromotive force.
3. the method that detects accumulator internal resistance by inductive discharge according to claim 1, it is characterized in that, the processing of described data, its method is: to a series of data that obtain, when 5-10 sampled point, adopt method of average deal with data, when 11-50 sampled point, adopt the Least Square in Processing data, when 50 sampled points are above, adopt the method deal with data of maximal possibility estimation.
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| CN100344984C true CN100344984C (en) | 2007-10-24 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967831B (en) * | 2012-09-17 | 2015-04-22 | 常州大学 | On-line detection system and detection method of lead-acid storage battery performance |
| CN105026944B (en) * | 2013-03-07 | 2019-08-27 | 古河电气工业株式会社 | Secondary cell condition checkout gear and secondary cell condition detection method |
| CN103163377A (en) * | 2013-03-13 | 2013-06-19 | 中国南方电网有限责任公司调峰调频发电公司 | Method for detecting internal resistance of storage battery through inductor-capacitor series discharge |
| CN103454593B (en) * | 2013-09-11 | 2016-07-13 | 上海明华电力技术工程有限公司 | Storage battery service life measurement method based on internal resistance and voltage measurement |
| CN104698383B (en) * | 2013-12-06 | 2019-01-29 | 东莞钜威动力技术有限公司 | A kind of internal resistance of cell measuring method and circuit of batteries management system |
| CN103645382B (en) * | 2013-12-13 | 2017-01-25 | 艾德克斯电子（南京）有限公司 | On-line battery internal resistance measuring apparatus and measuring method thereof |
| CN105445558A (en) * | 2015-12-08 | 2016-03-30 | 蔡卓丽 | Method for detecting DC internal resistance of battery |
| CN108152753A (en) * | 2017-12-30 | 2018-06-12 | 天津华庆百胜能源有限公司 | A kind of method that accumulator internal resistance is detected by inductance capacitance discharged in series |
| CN108254700A (en) * | 2018-01-29 | 2018-07-06 | 深圳市睿德电子实业有限公司 | Battery DC internal resistance measuring method |
| CN115144778A (en) * | 2022-09-02 | 2022-10-04 | 力高(山东)新能源技术有限公司 | Method for estimating internal resistance of battery by big data |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2046923A (en) * | 1979-04-12 | 1980-11-19 | Electricity Council | Automatic checking of batteries or cells |
| CN1061289A (en) * | 1990-11-03 | 1992-05-20 | 上海新宇电源厂 | Battery internal resistance monopulse determination method |
| CN1087179A (en) * | 1992-11-13 | 1994-05-25 | 群菱工业股份有限公司 | The method of testing of electric properties of battery unit |
| CN2171873Y (en) * | 1993-04-01 | 1994-07-13 | 李宏仁 | Detecting device for storage battery |
| JP2005156302A (en) * | 2003-11-25 | 2005-06-16 | Nissan Motor Co Ltd | Internal resistance detection device and method of secondary battery |
-
2005
- 2005-07-28 CN CNB2005100282121A patent/CN100344984C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2046923A (en) * | 1979-04-12 | 1980-11-19 | Electricity Council | Automatic checking of batteries or cells |
| CN1061289A (en) * | 1990-11-03 | 1992-05-20 | 上海新宇电源厂 | Battery internal resistance monopulse determination method |
| CN1087179A (en) * | 1992-11-13 | 1994-05-25 | 群菱工业股份有限公司 | The method of testing of electric properties of battery unit |
| CN2171873Y (en) * | 1993-04-01 | 1994-07-13 | 李宏仁 | Detecting device for storage battery |
| JP2005156302A (en) * | 2003-11-25 | 2005-06-16 | Nissan Motor Co Ltd | Internal resistance detection device and method of secondary battery |
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