CN105277791B - DC low current secondary discharge accumulator internal resistance online test method - Google Patents
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Abstract
The present invention relates to a kind of DC low current secondary discharge accumulator internal resistance online test method, low discharging current twice is carried out in the state of battery band load, two discharge loops are made up of the precision resistance for switching resistances different with two respectively, the method proposes on the basis of D.C. high-current electric discharge, and sampling holding first is carried out to the voltage collected that discharges twice using sampling holder during voltage acquisition, then the required voltage difference discharged twice is obtained through differential amplification, according to the voltage difference calculating accumulator internal resistance of double sampling.The shortcomings that this method not only overcomes infringement of the Big Current Discharge to battery and should not monitored on-line, and the precision for obtaining discharge voltage value difference twice by sampling holding and differential amplification and also improving data acquisition, reduce error, so as to obtain the exact value of accumulator internal resistance, the accurate detection of the internal resistance to battery under tape load state is realized.
Description
Technical field
The present invention relates to a kind of internal resistance of cell detection means, in more particularly to a kind of DC low current secondary discharge battery
Hinder online test method.
Background technology
Battery is playing an increasingly important role as the main carriers of energy storage in modern society, battery
It is widely used in industry-by-industry as electrokinetic cell or back-up source, the big each side for arriving military industry as low as daily life
Face.Moreover, battery is also widely used for industry-by-industry as back-up source.The either performance of battery, capacity
State or charge status, it can be embodied from its internal resistance change.Therefore can by measuring the internal resistance of battery,
Assessment is monitored to its working condition.Important parameter of the internal resistance of battery as reflection accumulator property, on its value
Accurate measurement particularly on-line checking tool is of great significance.
The conventional method of accumulator internal resistance detection at present mainly has densimetry, exchange injection method, direct-current discharge method.Densimetry
The internal resistance of battery mainly is estimated by detecting the density of battery liquid, is usually used in the interior of open type lead-acid accumulator
Resistance detection, is not suitable for the internal resistance detection of sealed type lead acid battery, and the scope of application of this method is narrower.It is right that exchange injection method passes through
Battery injects a low-frequency ac electric current signal, and the response of battery can produce the phase shift of a voltage and current, measure electric power storage
The low-frequency voltage at pond both ends and the low-frequency current flowed through and both phase differences, so as to calculate the internal resistance of battery.Hand over
Stream method is due to that need not discharge, without in static or off-line state, it is possible to achieve safe on-line checking management.But this
Because measurement amount is excessive, the factor of causing interference with increases kind method, and adds the complexity of system, influences measurement accuracy, relatively
For be relatively more suitable for the detection of cell.The general principle of DC internal resistance method of testing is loaded to battery series direct current,
Transient large current discharge is carried out to battery, usually tens to hundreds of ampere, front and rear discharge current is removed by detecting load
With the change of accumulator voltage, it is possible thereby to obtain the internal driving of battery.The major advantage of direct current method is battery
The internal resistance of battery can be accurately detected when online, measurement result is not influenceed by charger ripple and other noises.In addition,
Measurement error is can be controlled within 0.1%.The method method there is also it is certain the defects of, because discharge current is larger, low capacity electricity
Pond is likely difficult to bear larger electric current in seconds.Meanwhile when battery have big electric current by when, internal chemical reaction
It is complicated, it may appear that polarization resistance, the infringement to battery is also larger, and heavy-current discharge repeatedly is unfavorable for on-line checking.
The content of the invention
A kind of the problem of existing the present invention be directed to the conventional method of accumulator internal resistance detection, it is proposed that DC low current two
Secondary electric discharge accumulator internal resistance online test method, overcome infringement of the heavy-current discharge to battery and lacked with what should not be monitored on-line
Point.
The technical scheme is that：A kind of DC low current secondary discharge accumulator internal resistance online test method, specifically
Comprise the following steps：
1) two discharge loops, battery, the switch S for being connected on battery both ends are established1With sampling precision resistance R1Form
The first discharge loop, battery, the switch S for being connected on battery both ends2With sampling precision resistance R2The discharge loop of composition,
Single-chip microcomputer output control signal controls two switch S1、S2Fragmentary works；
2) two discharge loops are switched into S first1And S2All disconnect, measure load resistance both end voltage U0And electric current, by Europe
Nurse law can try to achieve the load resistor value R under battery presenceL；
3) first time low discharging current is carried out to battery, switchs S1Closure, switch S2Disconnect, detection battery both ends electricity
Press U1, then second of low discharging current is carried out to battery, switch S2Closure, switch S1Disconnect, detect battery both end voltage
U2, send Signal-regulated kinase to be handled after signal after collection, the U after Signal-regulated kinase processing1、U2Two are respectively fed to adopt
Sample retainer is kept, and two sampling holder outputs are re-fed into differential amplifier circuit and obtain U2-U1Value；
4) detected value feeding internal resistance calculating formula is obtained into internal resistance RS
The sampling hold circuit is from LF398 as sampling holder.
During step 3) the first time low discharging current, S is switched1Closure, switch S2Disconnect, the first sampling holder is in
Sample states；When then carrying out low discharging current, S is now switched2Closure, switch S1Disconnect, the first sampling holder, which is in, to be kept
State, the second sampling holder are in sample states；Latter two right sampling holder finally protects sampling all in hold mode
The data U of holder output1、U2With the U of differential amplifier circuit output2-U1It is sent into the single-chip microcomputer with AD conversion and electric power storage is calculated
The internal resistance value in pond.
The beneficial effects of the present invention are：DC low current secondary discharge accumulator internal resistance online test method of the present invention,
Not only overcome infringement of the Big Current Discharge to battery and the shortcomings that should not monitor on-line, and kept and poor by sampling
Divide amplification to obtain the precision that discharge voltage value difference twice also improves data acquisition, error is reduced, so as to obtain in battery
The exact value of resistance, realize the accurate detection of the internal resistance to battery under tape load state.
Brief description of the drawings
Fig. 1 is DC low current secondary discharge method equivalent circuit diagram of the present invention；
Fig. 2 is DC low current secondary discharge accumulator internal resistance on-line measuring device block diagram of the present invention；
Fig. 3 is present invention sampling holding part circuit diagram.
Embodiment
Fig. 1 is DC low current secondary discharge method equivalent circuit diagram, is circuit mould of the battery under direct-current discharge state
Type, battery, the switch S for being connected on battery both ends1With precision resistance R1The discharge loop I of composition, battery, is connected on storage
The switch S at battery both ends2With precision resistance R2The discharge loop II of composition.
Inframe be direct-current discharge state under battery equivalent model, RSThe as equivalent internal resistance of battery, RLFor in wire
Equivalent load under state, R1、R2For electric discharge precision resistance.
S is switched first1、S2All disconnect, R can be measuredLBoth end voltage U0With flow through RLElectric current IS, can be obtained by Ohm's law:
Secondly, first time low discharging current, S are carried out to battery1Closure, S2Disconnect, if R '1=R1//RL(R1、RLIt is in parallel
Value), R1Both end voltage is U1, can be obtained by Ohm's law：
Then, carry out second to battery to discharge, S2Closure, S1Disconnect, if R'2=R2//RL(R2、RLParallel value), R2
Both end voltage is U2, can be obtained by Ohm's law：
Arranged and can be obtained by formula (2), (3)：
By R '1、R'2(4) formula of substitution, which arranges, can obtain internal resistance RSFinal expression formula：
Therefore, understood to obtain the equivalent load R under battery presence first by formulaL, then by discharging twice measure U1、
U2、U2-U1, thus can try to achieve the internal resistance R of batteryS。
Understood to need the magnitude of voltage U for measuring precision resistance both ends in discharge loop twice by the expression formula of internal resistance1With U2, and
Both difference U2-U1, due to U2With U1Difference very little, in order to reduce measurement error, measurement accuracy is improved, herein first with adopting
Sample retainer is to U2And U1Sampling holding is carried out, U is then obtained by differential amplification2-U1Value.Then data are sent into and carry AD
The internal resistance value of battery is calculated in the single-chip microcomputer of conversion.
DC low current secondary discharge accumulator internal resistance on-line measuring device block diagram as shown in Figure 2.Battery from 12V,
38Ah analysing valve control type lead-acid accumulator batteries, main control chip selects C8051F350 single-chip microcomputers in Fig. 2, has electrification reset in piece, VDD prisons
Visual organ, band 24 or 16 single-ended/difference ADC, WatchDog Timer and clock oscillators, it is to be on the piece that can really work independently
System.Precision resistance R in discharge loop I, II1、R220 Ω and 10 Ω are taken respectively, and discharge current is no more than 2A, data acquisition twice
Voltage acquisition is realized from Hall sensor.Hall sensor gathers U0、U1、U2Signal-regulated kinase is sent to be handled after signal,
By internal resistance RSExpression formula understand need measure U2-U1Value, due to U2With U1Difference very little, in order to reduce measurement error, herein
First to U2And U1Carry out sampling holding, the U after sampling holding1、U2It is sent into A/D modular converters and carries out analog-to-digital conversion feeding single-chip microcomputer,
The U after keeping is sampled simultaneously1、U2It is sent into differential amplifier circuit and obtains U2-U1Value, then send A/D modular converters carry out modulus turn
Change, the U of Signal-regulated kinase output0By A/D modular converters output digit signals to single-chip microcomputer, single-chip microcomputer carries out internal resistance meter
Calculate.
Sampling holding part circuit diagram, sampling holder select LF398, its work are controlled using logic level as shown in Figure 3
Make state.Sampling holder has two stable working conditions.Sample states：Its reception simulation as fast as possible during this period
Input signal, and the accurately change of trace simulation input signal, until untill being connected to holding instruction；Hold mode：Docking
Flashy analog signal is sampled before receiving holding instruction.Sampling holder is in the stage of holding equivalent to " analog signal is deposited
Reservoir ".Fig. 3 is sampling holding part circuit diagram, and S is switched when discharging for the first time1Closure, S2Disconnect, sampling holder L1 is in and adopted
Sample state；Then carry out discharging for second, now S2Closure, S1Disconnect, sampling holder L1 is in hold mode, and L2 is in and adopted
Sample state；Then L1, L2 finally give the data collected to difference amplifier and obtain calculating electric power storage group all in hold mode
Data needed for internal resistance, the calculating of internal resistance is completed by single-chip microcomputer.
Claims (3)
1. a kind of DC low current secondary discharge accumulator internal resistance online test method, it is characterised in that specifically include following step
Suddenly：
1) two discharge loops, battery, the switch S for being connected on battery both ends are established1With sampling precision resistance R1The formed
One discharge loop, battery, the switch S for being connected on battery both ends2With sampling precision resistance R2The discharge loop of composition, monolithic
Machine output control signal controls two switch S1、S2Fragmentary works；
2) two discharge loops are switched into S first1And S2All disconnect, measure load resistance both end voltage U0And electric current, determined by ohm
Rule can try to achieve the load resistor value R under battery presenceL；
3) first time low discharging current is carried out to battery, switchs S1Closure, switch S2Disconnect, detection battery both end voltage U1,
Second of low discharging current is carried out to battery again, switchs S2Closure, switch S1Disconnect, detection battery both end voltage U2, collection
Signal-regulated kinase is sent to be handled after signal afterwards, the U after Signal-regulated kinase processing1、U2It is respectively fed to two sampling holders
Kept, two sampling holder outputs are re-fed into differential amplifier circuit and obtain U2-U1Value；
4) detected value feeding internal resistance calculating formula is obtained into internal resistance RS
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2. DC low current secondary discharge accumulator internal resistance online test method according to claim 1, it is characterised in that institute
Sampling holder is stated from LF398 as sampling holder.
3. DC low current secondary discharge accumulator internal resistance online test method according to claim 1 or claim 2, its feature exist
When, step 3) the first time low discharging current, S is switched1Closure, switch S2Disconnect, the first sampling holder is in sampling shape
State；When then carrying out low discharging current, S is now switched2Closure, switch S1Disconnecting, the first sampling holder is in hold mode,
Second sampling holder is in sample states；Latter two right sampling holder is all in hold mode, finally by sampling holder
The data U of output1、U2With the U of differential amplifier circuit output2-U1It is sent into the single-chip microcomputer with AD conversion and battery is calculated
Internal resistance value.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI636272B (en) * | 2017-04-26 | 2018-09-21 | 鴻準科技股份有限公司 | Battery monitoring system |
| CN109142872A (en) * | 2017-06-16 | 2019-01-04 | 日本贵弥功株式会社 | The measuring method and measurement device of the resistance of charge storage element |
| CN107797074A (en) * | 2017-11-29 | 2018-03-13 | 福州福光电子有限公司 | A kind of cell batteries internal resistance measurement circuit and measuring method |
| CN108196196A (en) * | 2017-12-30 | 2018-06-22 | 天津华庆百胜能源有限公司 | A kind of accumulator internal resistance online test method |
| CN111142037A (en) * | 2019-12-24 | 2020-05-12 | 许昌中科森尼瑞技术有限公司 | Online detection method for internal resistance of high-frequency discharge storage battery |
| CN113125979A (en) * | 2019-12-31 | 2021-07-16 | 华为技术有限公司 | Storage battery internal resistance detection device and method |
| CN113447839A (en) * | 2020-03-24 | 2021-09-28 | 上海汽车集团股份有限公司 | Battery internal resistance on-line monitoring device and method, BCM, battery and vehicle |
| CN112531833B (en) * | 2020-11-27 | 2023-04-18 | 江西百盈高新技术股份有限公司 | Charger capable of adjusting and repairing charging parameters according to internal resistance of battery |
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