CN102288830A - Storage battery impedance detection device excited by SPWA (Sine-wave Pulse Width Modulation) signal generated by single chip microcomputer - Google Patents
Storage battery impedance detection device excited by SPWA (Sine-wave Pulse Width Modulation) signal generated by single chip microcomputer Download PDFInfo
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- CN102288830A CN102288830A CN2011102678237A CN201110267823A CN102288830A CN 102288830 A CN102288830 A CN 102288830A CN 2011102678237 A CN2011102678237 A CN 2011102678237A CN 201110267823 A CN201110267823 A CN 201110267823A CN 102288830 A CN102288830 A CN 102288830A
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Abstract
The invention relates to a storage battery impedance detection device excited by an SPWA (Sine-wave Pulse Width Modulation) signal generated by a single chip microcomputer, in particular to a sealed valve regulated lead-acid storage battery internal resistance four-line detection device. A voltage sampling return circuit is formed by respectively accessing into a voltage detection device on positive and negative poles of a sealed valve regulated lead-acid storage battery VRLA to be detected by using two conducting wires; a current injection return circuit is formed by accessing into a current constant-current source by using another two conducting wires; the excitation signal is derived from the SPWA signal which is generated through programming by the single chip microcomputer; and modulation frequencies of the SPWA excitation signal can be modulated according to actual detection situations. According to the sealed valve regulated lead-acid storage battery internal resistance four-line detection device provided by the invention, the internal impedance distribution of the sealed valve regulated lead-acid storage battery VRLA can be detected by using different-frequency sine excitation signals obtained through an SPWM modulation mode; and the working states of the sealed valve regulated lead-acid storage battery VRLA can be comprehensively grasped.
Description
Technical field
The present invention relates to the accumulator field, especially a kind of internal battery impedance pick-up unit.
Background technology
The sealing valve-regulated lead-acid battery VRLA that adopts series connection in fields such as generating, power supply, communications is as standby power supply, and when communication power supply broke down, standby power supply must provide continual power supply supply immediately, to ensure the normal operation of total system.Therefore the quality of judging the battery pack power supply capacity is very important concerning the reliability in above-mentioned field and security.Because the VRLA accumulator is hermetic, can't detect its internal material with method intuitively.And just can judge its power supply capacity preferably by the impedance that detects accumulator.It is generally acknowledged that the impedance of accumulator was greater than 25% o'clock of this group storage battery impedance reference value, its power supply capacity descends, and needs the emphasis monitoring, if greater than 50% o'clock, its power supply capacity is unreliable, need replace.Minimum because of the impedance of accumulator, greatly about about 1.3~0.05 milliohms, and the accumulator of standby power supply is under the floating charge state at ordinary times all the time as the impedance ranges of the VRLA accumulator of 100~4000 commonly used ampere-hours.During floating charge, the charging current accumulators two ends that the charging set rectification circuit provides the very big undesired signal that superposeed.For guaranteeing the reliability of standby power supply, online impedance measurement must be carried out, under the strong interference environment of accumulator floating charging so just brought great difficulty to detection.
Impedance analysis is the common method in the electrochemical research, is the necessary means of battery performance research and product design.
Generally speaking, battery is when charge or discharge, and its internal resistance R is made up of following 3 parts:
R=Ro+Rc+Re
Ro in the formula is an ohmic internal resistance; Rc is the concentration difference internal resistance; Re is the activation internal resistance.
Ohmic internal resistance Ro comprises the resistance of whole parts such as electrode, barrier film, electrolytic solution, connection strap and pole of inside battery.Though ask that in the whole lifetime of battery its can change because of grid corrosion and electrode deformation, in each detection internal resistance of cell process, can think constant.
Concentration polarization internal resistance Rc is caused by the reactive ion concentration change, as long as there is electrochemical reaction carrying out, always the concentration of reactive ion is just changing, thereby its numerical value is to be in variable condition, measuring method is different or measure the duration difference, and its result who records also can be different.
Activation polarization internal resistance Re is by the decision of the character of electrochemical reaction system.Battery system and structure have determined that its activation polarization internal resistance is also just fixed.Only taken place to change and the current density that induces reaction just changes when changing, but its numerical value is still very little at battery life later stage or discharge later stage electrode structure and state.
In a lot of research methods, use and represent battery as the equivalent electrical circuit of Fig. 4.
The impedance of battery comprises Ohmage and both positive and negative polarity impedance, obviously is a complex impedance, and is under the constant situation of other condition, relevant with test frequency.
What both at home and abroad the detection of accumulator is adopted substantially for a long time, is " capacity electric discharge ".Facts have proved that " capacity electric discharge " though detect reliability, accuracy is higher, the fatal shortcoming of this method is that battery is wanted off-line test, and is time-consuming many, ability was surveyed once in general one, two year.And adopt the measuring internal impedance method, and can under the online floating charging situation of battery, measure at any time, do not influence the back-up job of accumulator to electric power system, be an innovation on the measuring technique.
In recent years, along with continuous progress in science and technology and development, the internal resistance measurement instrument of international and domestic various types of accumulators that released one after another, its measuring method generally is " direct-current discharge method " and " AC method ".
One, direct-current discharge method
This is the method that realizes that the earliest accumulator internal resistance is measured, during measurement, to the big electric current I of battery about with 70A, discharge T second, measure T and discharge second after more stable battery terminal voltage V1 of later stage and discharge finish, battery terminal voltage V2, R equals (V2-V1) and gets cell resistance divided by I as calculated.But T length second all has complicated influence to V1 and V2, has therefore influenced the antijamming capability of measuring accuracy and system.Measuring error may reach 5%, and is difficult to measure the above battery of 2000AH, and the method can't be come the measuring accuracy of calibration instrument with measuring resistance.
Two, AC method
The method is measured the alternating voltage at battery two ends then to the ac-excited electric current of a 1~2A of tested battery injection, calculates cell resistance again, and the method exciting current is little, can come the measuring accuracy of calibration instrument with measuring resistance.
The high capacity electrolytic condenser but the method need be connected in the exciting current loop, high capacity electrolytic condenser itself are stable inadequately, thereby make exciting current also stable inadequately.
In addition, can also calculate dump energy by the discharge condition impedance data.Variation and the electric capacity of the internal driving of sealing valve-regulated lead-acid battery VRLA in charge and discharge process exists inevitable relation.
Existing internal resistance test device product all is to adopt the single-frequency that does not wait from 10Hz to 1000Hz as ac-excited electric current, and do not adopt continuous frequency or several Frequency points as excitation frequency, and only limit to the measurement of internal resistance, the internal driving of sealing valve-regulated lead-acid battery VRLA is not measured, the bulk properties of the sealing valve-regulated lead-acid battery VRLA that obtains are incomplete.
Impedance measurement is the qualitative change of battery detection technology, promptly by passive monitoring voltage to test battery internal state initiatively, more can reflect the performance change situation of sealing valve-regulated lead-acid battery VRLA all sidedly.
The data of different measuring method have been carried out comparative study, proved that test frequency and method have a significant impact the internal driving numerical value of sealing valve-regulated lead-acid battery VRLA.
Summary of the invention
The present invention will solve the shortcoming of above-mentioned prior art, the internal driving that provides a kind of sinusoidal excitation signal by SPWM modulation system acquisition different frequency to measure sealing valve-regulated lead-acid battery VRLA distributes, and can grasp the internal battery impedance pick-up unit of sealing valve-regulated lead-acid battery VRLA duty all sidedly.
The present invention solves the technical scheme that its technical matters adopts: this internal battery impedance measurement mechanism, comprise: single-chip microcomputer, sealing valve-regulated lead-acid battery, SPWM signal voltage detecting device, A/D converter, it is characterized in that: single-chip microcomputer is connected with the SPWM signal generator, constitute an electric current constant current source, wherein, has the internal driving computing module in the single-chip microcomputer, the response signal voltage value that the internal driving computing module produces with SPWM signal voltage detecting device is calculated the impedance of sealing valve-regulated lead-acid battery with Ohm law; The two ends of SPWM signal generator are loaded into the positive and negative end that seals valve-regulated lead-acid battery by lead, and the exciting signal frequency that the SPWM signal generator is produced is 10~1000HZ, and the waveform that produces through sine wave signal generator is sinusoidal wave; The positive and negative end of sealing valve-regulated lead-acid battery is incorporated on the SPWM signal voltage detecting device by two leads in addition; SPWM signal voltage detecting device is connected with the dynamic digital bandpass filter, and the dynamic digital bandpass filter is connected with A/D converter, and A/D converter is connected with single-chip microcomputer again, forms a loop.
As preferably, contain wave digital lowpass filter in the SPWM signal generator.
As preferably, the outlet of SPWM signal voltage detecting device is connected with signal amplifier, and signal amplifier wherein adopts multilevel voltage linear amplification or logarithm to amplify.
As preferably, the dynamic digital bandpass filter adopts 8 rank DSP high-speed chips, and the response signal that SPWM signal voltage detecting device produces is carried out filtering.
As preferably, the response signal calculating voltage mean value that the magnitude of voltage in the internal driving computing module produces SPWM signal voltage detecting device with the linear averaging method.
As preferably, the dynamic digital bandpass filter is connected with RQ resistance, R2A resistance, RF resistance, and wherein RF resistance is regulated by stepper motor by single-chip microcomputer; The RF resistance value that single-chip microcomputer is set is determined according to the response signal that SPWM signal voltage detecting device produces.
Inventing useful effect is:
One, the present invention has adopted single-chip microcomputer to generate the SPWM modulation signal by software, thereby obtain the continuous sinusoidal wave constant current signal of any frequency from 10Hz to 1000Hz, reduce the cost of traditional generation sine wave signal, also reduced the power consumption of whole metering circuit simultaneously;
Two, the present invention has adopted dynamic band to lead to digital filtering technique, and therefore, the centre frequency of bandpass filtering is to change along with the frequency of input sine wave signal, has enlarged conventional measurement techniques only to use single-frequency to measure;
Three, the present invention not only calculates the changes in amplitude of sine wave output, and the phase differential that calculates sine wave changes, therefore, can calculate sealing valve-regulated lead-acid battery VRLA internal driving fully, capacitive reactance and induction reactance CALCULATION OF PARAMETERS have been increased than traditional measuring technique, more all sidedly the duty of reflection sealing valve-regulated lead-acid battery VRLA.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit theory diagrams of embodiment;
Fig. 3 is the circuit theory diagrams of dynamic digital bandpass filter;
Fig. 4 is the equivalent electrical circuit of battery.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
Embodiment:
In a kind of internal battery impedance measurement mechanism, single-chip microcomputer is connected with the SPWM signal generator, constitute an electric current constant current source, wherein, have the internal driving computing module in the single-chip microcomputer, contain wave digital lowpass filter in the SPWM signal generator, the two ends of SPWM signal generator are loaded into the positive and negative end of sealing valve-regulated lead-acid battery by lead, the exciting signal frequency that the SPWM signal generator is produced is 10~1000HZ, and the waveform that produces through sine wave signal generator is sinusoidal wave; The positive and negative end of sealing valve-regulated lead-acid battery is incorporated on the SPWM signal voltage detecting device by two leads in addition; The outlet of SPWM signal voltage detecting device is connected with signal amplifier, and signal amplifier is connected with the dynamic digital bandpass filter, and the dynamic digital bandpass filter is connected with A/D converter, and A/D converter is connected with single-chip microcomputer again, forms a loop.
Single-chip microcomputer generates the SPWM modulation signal by the SPWM signal generator, thereby the continuous sinusoidal wave constant current signal of acquisition any frequency from 10Hz to 1000Hz is as pumping signal.Small voltage signal with SPWM signal voltage detecting device sampling acquisition, size according to range, carry out linear amplification or logarithm amplification by signal amplifier, obtain pure sine wave by adopting 8 rank DSP high-speed chips corresponding signal to be carried out filtering again as the logical digital band-pass filter of dynamic eight grades of bands.Its peak-to-peak value and phase differential are changed through A/D, be input in the single-chip microcomputer, offset of sinusoidal wave amplitude and phase extraction, calculate comparison with the steady current of sealing valve-regulated lead-acid battery VRLA input end, just obtained the sealing valve-regulated lead-acid battery VRLA internal driving distribution situation on cline frequency.Here, the centre frequency of bandpass filtering is consistent with the sine wave signal of SPWM modulation, that is to say, the centre frequency of bandpass filtering is the frequency dynamic variation along with the SPWM modulation signal.
The internal driving computing module obtains the response signal voltage value that SPWM signal voltage detecting device produces, response signal calculating voltage mean value so that the linear averaging method produces SPWM signal voltage detecting device calculates the impedance of sealing valve-regulated lead-acid battery with Ohm law.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. internal battery impedance measurement mechanism, comprise: single-chip microcomputer, sealing valve-regulated lead-acid battery, SPWM signal voltage detecting device, A/D converter, it is characterized in that: single-chip microcomputer is connected with the SPWM signal generator, constitute an electric current constant current source, wherein, have the internal driving computing module in the single-chip microcomputer, the response signal voltage value that the internal driving computing module produces with SPWM signal voltage detecting device is calculated the impedance of sealing valve-regulated lead-acid battery with Ohm law;
The two ends of SPWM signal generator are loaded into the positive and negative end that seals valve-regulated lead-acid battery by lead, and the exciting signal frequency that the SPWM signal generator is produced is 10~1000HZ, and the waveform that produces through sine wave signal generator is sinusoidal wave;
The positive and negative end of sealing valve-regulated lead-acid battery is incorporated on the SPWM signal voltage detecting device by two leads in addition;
SPWM signal voltage detecting device is connected with the dynamic digital bandpass filter, and the dynamic digital bandpass filter is connected with A/D converter, and A/D converter is connected with single-chip microcomputer again, forms a loop.
2. a kind of internal battery impedance measurement mechanism according to claim 1 is characterized in that: contain wave digital lowpass filter in the SPWM signal generator.
3. a kind of internal battery impedance measurement mechanism according to claim 1 is characterized in that: the outlet of SPWM signal voltage detecting device is connected with signal amplifier, and signal amplifier wherein adopts multilevel voltage linear amplification or logarithm to amplify.
4. a kind of internal battery impedance measurement mechanism according to claim 1 is characterized in that: the dynamic digital bandpass filter adopts 8 rank DSP high-speed chips, and the response signal that SPWM signal voltage detecting device produces is carried out filtering.
5. a kind of internal battery impedance measurement mechanism according to claim 1 is characterized in that: the response signal calculating voltage mean value that the magnitude of voltage in the internal driving computing module produces SPWM signal voltage detecting device with the linear averaging method.
6. a kind of internal battery impedance measurement mechanism according to claim 1 is characterized in that: the dynamic digital bandpass filter is connected with RQ resistance, R2A resistance, RF resistance, and wherein RF resistance is regulated by stepper motor by single-chip microcomputer; The RF resistance value that single-chip microcomputer is set is determined according to the response signal that SPWM signal voltage detecting device produces.
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102854472A (en) * | 2012-09-11 | 2013-01-02 | 南京鼎尔特科技有限公司 | Storage battery sensor based on Internet of things technology |
CN104142479A (en) * | 2014-08-08 | 2014-11-12 | 成都蓝格尔科技有限公司 | Test module, monitor system and detection method for lead-acid cells |
CN106896328A (en) * | 2017-03-14 | 2017-06-27 | 河北工业大学 | Energy-storage battery intelligence servicing unit |
CN107230288A (en) * | 2017-05-24 | 2017-10-03 | 苏州我要亲点电子科技有限公司 | A kind of new intelligent charging spot |
CN108226784A (en) * | 2016-12-21 | 2018-06-29 | 南京鼎尔特科技有限公司 | A kind of battery impedance measuring method based on SPWM self-adapting frequency conversions point |
CN108459277A (en) * | 2018-05-03 | 2018-08-28 | 北京新能源汽车股份有限公司 | A kind of acquisition methods, device and the measuring apparatus of electrical connection internal resistance |
CN109212430A (en) * | 2018-07-27 | 2019-01-15 | 深圳市美思创电子有限公司 | A kind of battery impedance measurement method and system based on the small signal of analog AC |
CN109313229A (en) * | 2016-06-20 | 2019-02-05 | 伊顿智能动力有限公司 | For detecting the monitoring system and method for the thermomechanical strain fatigue in electrical fuse |
CN109557476A (en) * | 2018-12-05 | 2019-04-02 | 珠海朗尔电气有限公司 | Measuring device and measuring method |
CN111175663A (en) * | 2020-02-17 | 2020-05-19 | 李树成 | Method and instrument for testing activation internal resistance of battery |
CN112292605A (en) * | 2018-04-24 | 2021-01-29 | 豪夫迈·罗氏有限公司 | Method for determining system resistance of handheld medical device |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201570894U (en) * | 2009-12-17 | 2010-09-01 | 佛山市柏克电力设备有限公司 | Small-sized emergency power supply |
CN202330560U (en) * | 2011-09-09 | 2012-07-11 | 浙江东冠电气科技有限公司 | Storage battery impedance detection device excited by SPWM (Sinusoidal Pulse Width Modulation) signals generated by single-chip microcomputer |
-
2011
- 2011-09-09 CN CN2011102678237A patent/CN102288830A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201570894U (en) * | 2009-12-17 | 2010-09-01 | 佛山市柏克电力设备有限公司 | Small-sized emergency power supply |
CN202330560U (en) * | 2011-09-09 | 2012-07-11 | 浙江东冠电气科技有限公司 | Storage battery impedance detection device excited by SPWM (Sinusoidal Pulse Width Modulation) signals generated by single-chip microcomputer |
Non-Patent Citations (1)
Title |
---|
方小斌: "锂离子电池在线监测系统的研究与设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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CN104142479A (en) * | 2014-08-08 | 2014-11-12 | 成都蓝格尔科技有限公司 | Test module, monitor system and detection method for lead-acid cells |
CN104142479B (en) * | 2014-08-08 | 2016-12-07 | 成都蓝格尔科技有限公司 | A kind of test module of lead-acid battery |
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CN111175663A (en) * | 2020-02-17 | 2020-05-19 | 李树成 | Method and instrument for testing activation internal resistance of battery |
WO2022062599A1 (en) * | 2020-09-25 | 2022-03-31 | 大唐恩智浦半导体(徐州)有限公司 | Battery impedance measurement circuit |
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