CN101685117A - Internal resistance measuring method for storage battery - Google Patents
Internal resistance measuring method for storage battery Download PDFInfo
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- CN101685117A CN101685117A CN200910181563A CN200910181563A CN101685117A CN 101685117 A CN101685117 A CN 101685117A CN 200910181563 A CN200910181563 A CN 200910181563A CN 200910181563 A CN200910181563 A CN 200910181563A CN 101685117 A CN101685117 A CN 101685117A
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Abstract
The invention discloses an internal resistance measuring method for a storage battery. Specifically, the method comprises the following steps: connecting an actuating signal generating unit, a batteryto be detected, a sampling resistor and an isolated direct current capacitor in series; extracting effective signals from voltage response signals at two ends of the storage battery and the samplingresistor through an active band-pass filter respectively; processing the extracted signals through a peak value detection unit to acquire a peak value voltage thereof; and amplifying the peak value voltage, sending the amplified peak value voltage to an AD for processing the peak value voltage by a single chip, and calculating the internal resistance of the storage battery. The internal resistancemeasuring method for the storage battery provided by the invention can measure the internal resistance of the storage battery on line, has the advantages of simple implementation, stable measurementresult and the like, and can be applied to the situations of monitoring the health conditions of the storage battery, estimating the capacity of the storage battery and the like.
Description
Affiliated technical field
The present invention relates to the accumulator field in the power-supply system, relate in particular to a kind of internal resistance measurement method of accumulator.
Background technology
Lead-acid accumulator is a widely used back-up source in the present standby power system, and its reliability is related to the safety and stablization of numerous critical systems such as computer system, telecommunication system, petrochemical complex reflection device.Battery malfunction or off-capacity just might cause a serious accident, so battery detecting and monitoring are the hot issues of research both at home and abroad always.The main foundation whether terminate the serviceable life of detection battery is whether the residual capacity of battery satisfies job requirement.The size of capacity not only operational factor such as operating ambient temperature, the terminal voltage etc. with battery is relevant, and also the constructing variable with battery is relevant, as density of electrolyte, the internal resistance of cell etc.Wherein internal resistance is as one of most important parameter of battery, has closely with capacity and gets in touch, and it not only reflects the state-of-charge that battery is current, but also the degradation of reflection battery, the variation reflection battery performance and the life-span of the internal resistance of cell.Therefore adopt the internal resistance detection method to measure the performance of battery, realize maintenance, for generally acknowledging one of scheme effectively of battery service at present to accumulator.
The direct-current discharge method is carried out transient large current discharge (being generally tens to amperes up to a hundred) based on desirable DC circuit to accumulator, utilizes the moment pressure drop of measuring the battery two ends then, calculates the internal resistance of cell by Ohm law again.This method is simple and be easy to realization, has obtained certain application in practice.But this method must be carried out under the situation of static state or off line, can't realize on-line measurement, and the immediate current that battery pack is emitted is bigger, all can cause bigger impact to battery pack and load, influences battery and uses.In addition, measurement result stability is not good, generally is applicable to measuring accuracy and the not high occasion of security requirement.
The electrochemical impedance spectrometry is commonly called as " AC impedence method ", be a kind of with small magnitude sine-wave current or voltage signal as driving source, injecting accumulator is calculated the internal resistance of cell by measuring its response signal.AC impedence method is neither steady state method, neither transient method, but under a stable state, apply a little disturbance, be a kind of quasi stationary approach.The advantage of this method is that on-line measurement can avoid microvariations to the influence that system produces, and keeps approximate linear between the response of disturbance and system.Its shortcoming is to need to utilize complicated phase-sensitive detection technology, realizes difficulty, the cost height.
Summary of the invention
The object of the invention is to provide a kind of and is easy to realize, the internal resistance measurement method of low-cost, high-precision battery.
The technical scheme that the present invention takes is as follows:
(1), with pumping signal generating unit, mesuring battary, sample resistance and isolated DC capacitances in series get up to constitute the loop; Wherein the pumping signal generating unit produces the sine wave AC pumping signal of 26～100Hz, and the sample resistance resistance is 0.4～0.6 Ω, and the isolated DC capacitance is 3300～5000uF, and withstand voltage is 50V;
(2), utilize detecting signal unit respectively to accumulator both end voltage response signal U
rVoltage responsive signal U with the sample resistance two ends
RMeasure, handle obtaining accumulator internal resistance again according to Ohm law by single-chip microcomputer; Wherein utilize the detecting unit measurement to comprise following 4 concrete steps:
1., extract the AC signal of the same frequency that produces with the described signal generating unit of step (1) with active bandwidth-limited circuit;
2., AC signal that 1. above-mentioned steps is obtained carries out peak value and detects, the peak value that this step detects promptly can be a positive peak, also can be negative peak, but requires just getting simultaneously or getting negative simultaneously;
3., crest voltage that 2. step is obtained amplifies, enlargement factor is 100～500;
4., the amplification voltage that 3. step is obtained is sent into AD converter, the acquisition magnitude of voltage.
Wherein, the measurement of the internal resistance of cell is relevant with survey frequency under the constant situation of other measuring conditions.Survey frequency is determined by the battery impedance spectrogram.The resistance of sample resistance is mated value according to battery types.Electric capacity value in giving scope does not have obvious influence to measurement result, only for satisfying isolated DC.
The invention has the beneficial effects as follows that the present invention compares with classic method, do not need to use complicated phase sensitivity technology, belong to a kind of and be easy to realize, the measuring method of low-cost, high-precision accumulator internal resistance.
Description of drawings
Fig. 1 electrical connection diagram of the present invention.Label title among Fig. 1: R high-accuracy sampling resistance, the r internal resistance of cell, C large bulk capacitance, 101 signal generating units, 102 detecting signal units.
Fig. 2 signal excitation unit schematic diagram.
Fig. 3 the inventive method process flow diagram.
Fig. 4 bandwidth-limited circuit schematic diagram.
Fig. 5 peak value detects schematic diagram.
Fig. 6 amplifying circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing working of an invention is made and to be further specified.
Fig. 1 is an electrical connection diagram of the present invention.According to shown in Figure 1, (value becomes the series connection connecting circuit in 3300uF～5000uF), high-accuracy sampling resistance R (value is 0.5 Ω) with itself and 101 (signal generating units), battery pack to choose large bulk capacitance C.Wherein 102 is detecting signal unit, can handle the response signal at battery and resistance two ends respectively by selecting circuit.
Fig. 2 is the circuit theory diagrams of signal generating unit.U1 is accurate function generator, adjusts the frequency of required pumping signal by the value that R1, R2, R3, R4 and C1 are set, and can regulate the size of output signal amplitude by the value of regulating R6.U is an operational amplifier.
Fig. 3 is the inventive method process flow diagram, and as shown in the figure, this method comprises following four steps.
Step 301: respectively the voltage responsive signal at accumulator two ends and the voltage responsive signal at sample resistance two ends are passed through the active band-pass filter filtering noise.Its concrete fundamental diagram such as Fig. 4.U2 is an active band-pass filter, sets the centre frequency and the bandwidth of bandpass filtering by the value that RQ, RF1, RF2 and R2A are set.Wherein given numerical value is 20Hz for satisfying centre frequency among the figure, and bandwidth is 0.1Hz.
Step 302: filtered sine wave signal by peak detection circuit, is extracted its crest voltage.Its concrete fundamental diagram as shown in Figure 5.U3 is a voltage comparator, and U4 is a voltage follower.Comparer aligns crest voltage and samples, and follower is that voltage is kept.Wherein C1 is necessary for polar capacitor.
Step 303: crest voltage is amplified.Its concrete fundamental diagram as shown in Figure 6.U5 is the precision instrument amplifier.Except that R200, R21 and C20 parameter were adjustable, all the other parameters were fixed.Regulate gain by regulating R200 and R21 parameter.Matching capacitance C20 filtering switching noise.
Step 304: the crest voltage after will amplifying is carried out the AD sampling.
Step 305: equal the resistance ratio rule by Ohm law series circuit voltage ratio, cooperate sampling numerical value, calculate accumulator internal resistance.
Claims (1)
1, a kind of internal resistance measurement method of accumulator is characterized in that, may further comprise the steps:
(1), pumping signal generating unit, mesuring battary, sample resistance and isolated DC capacitances in series are got up to constitute the loop; Wherein the pumping signal generating unit produces the sine wave AC pumping signal of 26～100Hz, and the sample resistance resistance is 0.4～0.6 Ω, and the isolated DC capacitance is 3300～5000uF, and withstand voltage is 50V;
(2), utilize detecting signal unit respectively to accumulator both end voltage response signal U
rVoltage responsive signal U with the sample resistance two ends
RMeasure, handle obtaining accumulator internal resistance again according to Ohm law by single-chip microcomputer; Wherein utilize the detecting unit measurement to comprise following 4 concrete steps:
1., extract the AC signal of the same frequency that produces with the described signal generating unit of step (1) with active bandwidth-limited circuit;
2., AC signal that 1. above-mentioned steps is obtained carries out peak value and detects, the peak value that this step detects promptly can be a positive peak, also can be negative peak, but requires just getting simultaneously or getting negative simultaneously;
3., crest voltage that 2. step is obtained amplifies, enlargement factor is 100～500;
4., the amplification voltage that 3. step is obtained is sent into AD converter, the acquisition magnitude of voltage.
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| CN200910181563A CN101685117A (en) | 2009-07-20 | 2009-07-20 | Internal resistance measuring method for storage battery |
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| CN200910181563A CN101685117A (en) | 2009-07-20 | 2009-07-20 | Internal resistance measuring method for storage battery |
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| CN102866300A (en) * | 2012-09-11 | 2013-01-09 | 南京鼎尔特科技有限公司 | Low-frequency micro-current constant-current exciting circuit and storage battery internal resistance measuring circuit |
| CN103278695A (en) * | 2013-06-05 | 2013-09-04 | 安徽安凯汽车股份有限公司 | Electric car power battery pack internal resistance monitoring system and monitoring method thereof |
| CN103926467A (en) * | 2014-04-23 | 2014-07-16 | 首都师范大学 | Method and device for rapidly representing specific resistance value exceeding |
| CN104062506A (en) * | 2014-04-29 | 2014-09-24 | 深圳清华大学研究院 | Measuring method and device for ohmic internal resistance of storage battery |
| CN105675996A (en) * | 2016-04-15 | 2016-06-15 | 桂林电子科技大学 | Power cell internal resistance on-line monitoring system and method |
| CN106199200A (en) * | 2016-07-19 | 2016-12-07 | 重庆恩信科技有限公司 | Accumulator internal resistance on-line monitoring system and method |
| CN106324510A (en) * | 2016-08-05 | 2017-01-11 | 北方奥钛纳米技术有限公司 | Battery detection method and device |
| CN106370918A (en) * | 2015-07-24 | 2017-02-01 | 德州仪器公司 | Methods and apparatus for peak-voltage measurement of AC signals |
| CN108169693A (en) * | 2018-03-21 | 2018-06-15 | 国家电网公司 | A kind of accumulator group online evaluation detecting system |
| CN108614220A (en) * | 2018-05-14 | 2018-10-02 | 浙江大学 | A kind of accumulator internal resistance measurement method based on damped oscillation |
| CN109560781A (en) * | 2018-11-13 | 2019-04-02 | 厦门科华恒盛股份有限公司 | A kind of signal amplification circuit and battery management system |
| CN109557476A (en) * | 2018-12-05 | 2019-04-02 | 珠海朗尔电气有限公司 | Measuring device and measuring method |
| CN109581238A (en) * | 2018-12-05 | 2019-04-05 | 珠海东帆科技有限公司 | A kind of internal resistance of cell measuring circuit and measurement method |
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| CN110346646A (en) * | 2019-07-11 | 2019-10-18 | 湖南省计量检测研究院 | Super capacitor internal resistance measuring method, device and computer readable storage medium |
| CN110376438A (en) * | 2019-08-06 | 2019-10-25 | 黑龙江省计量检定测试研究院 | Internal resistance of power lithium battery detection device and its detection method |
| CN110441705A (en) * | 2019-08-20 | 2019-11-12 | 广州供电局有限公司 | Battery impedance test device and method |
| CN111257776A (en) * | 2020-03-03 | 2020-06-09 | 珠海朗尔电气有限公司 | Method and device for measuring internal resistance of storage battery |
| CN111650524A (en) * | 2020-04-29 | 2020-09-11 | 千黎（苏州）电源科技有限公司 | Alternating current impedance testing system and method for power battery |
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- 2009-07-20 CN CN200910181563A patent/CN101685117A/en active Pending
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| CN103278695A (en) * | 2013-06-05 | 2013-09-04 | 安徽安凯汽车股份有限公司 | Electric car power battery pack internal resistance monitoring system and monitoring method thereof |
| CN103278695B (en) * | 2013-06-05 | 2016-08-17 | 安徽安凯汽车股份有限公司 | A kind of electric car power battery pack internal resistance monitoring system and monitoring method thereof |
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| CN104062506A (en) * | 2014-04-29 | 2014-09-24 | 深圳清华大学研究院 | Measuring method and device for ohmic internal resistance of storage battery |
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