CN101692119A  Method for measuring internal resistance of storage battery based on differential equation  Google Patents
Method for measuring internal resistance of storage battery based on differential equation Download PDFInfo
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 CN101692119A CN101692119A CN200910180204A CN200910180204A CN101692119A CN 101692119 A CN101692119 A CN 101692119A CN 200910180204 A CN200910180204 A CN 200910180204A CN 200910180204 A CN200910180204 A CN 200910180204A CN 101692119 A CN101692119 A CN 101692119A
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 accumulator
 internal resistance
 wave generator
 storage battery
 voltage
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 238000000691 measurement method Methods 0.000 claims abstract description 8
 238000004364 calculation methods Methods 0.000 abstract description 2
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 206010071172 Device battery issue Diseases 0.000 description 1
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 238000009795 derivation Methods 0.000 description 1
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 230000004069 differentiation Effects 0.000 description 1
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Abstract
Description
(1), technical field
The present invention relates to a kind of accumulator internal resistance measurement method, specifically a kind of accumulator internal resistance measurement method based on the differential equation.
(2), background technology
Standby power supply when accumulator has a power failure as powersupply system is widely used in industries such as commercial production, traffic, communication.If battery failure or offcapacity, just might cause a serious accident, so, the operational factor of accumulator is carried out comprehensive online monitoring, to the safe operation that improves straightflow system, reliability and the automaticity that improves electric power system, crucial meaning is arranged.
It is exactly its internal resistance that accumulator uses one of important parameter of consumption state.No matter be that accumulator is about to inefficacy, offcapacity or discharges and recharges improperly, embody can both changing from its internal resistance.Therefore can its duty be assessed by measuring accumulator internal resistance.
At present, the online monitoring method of realization internal resistance of single cell mainly contains densimetry, opencircuit voltage method, directcurrent discharge method and AC method etc.Densimetry is mainly estimated the internal resistance of accumulator by the density of measuring battery liquid, be usually used in the internal resistance measurement of open type leadacid battery, is not suitable for the internal resistance measurement of sealed lead acid storage battery.The opencircuit voltage method is to estimate accumulator internal resistance by the terminal voltage of measuring accumulator, precision is very poor, even might derive a wrong conclusion, even because the accumulator that capacity has become very little, its terminal voltage still may show very normally under floating charge state.By battery is carried out transient large current discharge, the transient voltage of measuring on the battery falls the directcurrent discharge method, calculates the internal resistance of cell by Ohm law exactly.Though this method has also obtained using widely in practice, but also there are some shortcomings in it, as with this method accumulator internal resistance being detected must be to carry out under static state or offline state, can't realize online measurement, and heavycurrent discharge can cause bigger infringement to accumulator, thereby influences the capacity and the lifespan of accumulator.AC method is measured the voltage responsive signal at accumulator two ends and both phase differential by accumulator is injected a constant ac current signal, is determined the internal resistance of accumulator by formula of impedance.This method does not need accumulator is discharged, and can realize the online detection internal resistance of cell of safety, so can the performance of accumulator not impacted.But this method need be measured the phase differential between ac current signal, voltage responsive signal and the voltage and current, and this method not only disturbing factor is many, and has increased the complicacy of system, has also influenced measuring accuracy simultaneously.
(3), summary of the invention
The present invention is intended to by a kind of accumulator internal resistance measurement method based on the differential equation is provided, to overcome the defective of existing accumulator internal resistance measurement method.First technical matters to be solved is: by connection side's wave producer, measure the voltage that is about to disconnect its two ends of moment under the squarewave generator connection situation, squarewave generator is about to connect the voltage at its two ends of moment when disconnecting, connect the voltage of moment under the squarewave generator disconnection, and calculate to obtain the ohmic internal resistance value and the polarization resistance value of accumulator by formula, in order to judge the failure degree of accumulator.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme.
A kind of accumulator internal resistance measurement method based on the differential equation is characterized in that carrying out according to following steps:
Connection side's wave producer between charger and accumulator, three's positive pole is connected to each other, and negative pole also is connected to each other;
Measure the voltage v that is about to disconnect its two ends of moment under the squarewave generator connection situation _{3bb}, squarewave generator is about to the voltage v at its two ends of closed circuit moment when disconnecting _{3kk}, connect the voltage v of moment under the squarewave generator disconnection _{3kb}
Calculate the ohmic internal resistance R of accumulator _{0},
In the formula, the measuring current when on behalf of squarewave generator, I connect;
And calculate the polarization resistance R of accumulator _{2},
According to the ohmic internal resistance value of accumulator and the failure degree of polarization resistance value judgement accumulator.
Good effect of the present invention is: the present invention is on the basis of comprehensive traditional internal resistance of cell measuring method, by the battery circuit differential equation group, derive the computing formula of accumulator ohmic internal resistance and polarization resistance, and provide the measuring method of the measurement data that needs in the computing formula.
This method not only can calculate the ohmic internal resistance of accumulator, can also calculate the polarization resistance of accumulator.Therefore can reflect the variation of accumulator internal resistance more accurately, thereby judge the failure degree of accumulator more accurately.
On the other hand, compare with original measuring method, computing method of the present invention are easier, and measurement result is more reliable.
(4), description of drawings
Fig. 1 is the battery model synoptic diagram under the floating charge state of the present invention.
(5), embodiment
Below in conjunction with accompanying drawing and embodiment is provided, the present invention is further described.
Fig. 1 is the model of the accumulator under the floating charge state, and it is by charger 1, and squarewave generator 2 and accumulator 3 are formed, and their positive pole is connected to each other, and negative pole also is connected to each other.
Among the figure, E _{1}Represent the voltage of charger, R _{1}Represent the internal resistance of charger, I _{1}Represent the electric current of charger, R _{0}, R _{2}Represent the resistance and the electric capacity of accumulator internal resistance equivalent electrical circuit, E respectively with C _{2}Represent the electromotive force of accumulator, I _{2}Represent the electric current of accumulator, I _{3}Represent measuring current.
At first, record the voltage v that is about to disconnect its two ends of moment under the squarewave generator connection situation _{3bb}, squarewave generator is about to the voltage v at its two ends of closed circuit moment when disconnecting _{3kk}, connect the voltage v of moment under the squarewave generator disconnection _{3kb}
Then, calculate the ohmic internal resistance R of accumulator _{0},
In the formula, the measuring current when on behalf of squarewave generator, I connect;
And calculate the polarization resistance R of accumulator _{2},
At last, the failure degree of judging accumulator according to the ohmic internal resistance value and the polarization resistance value of accumulator.The standard of international differentiation accumulator actual effect is that internal resistance surpasses 30% of new accumulator internal resistance, or internal resistance surpasses 30% of a group storage battery internal resistance mean value.
Below be the derivation of abovementioned judgment formula:
Definition Then the no matter switching of measurement circuit always has
In the formula, u represents the voltage at capacitor two ends, and t represents the time;
Test voltage V _{3}Two kinds be expressed as
So have
Satisfy u (0)=u _{0}General solution be
And
(1) stable state reaches the moment of closing
Pwire open circuit, when reaching stable state
Thus
Note R _{02}=R _{0}+ R _{2}Then
Therefore after closed circuit
Utilize
{。##.##1},
Get by (1) and (2)
(2), the moment of opening after the closed circuit stable state
Pwire is closed circuit, when the T time reaches stable state
Thus
Therefore behind the open circuit
Utilize
v _{3bk}Represent the voltage that disconnects moment under the squarewave generator connection situation;
Get by (3) and (4)
(3), the calculating of polarization resistance
Get by (1) and (3)
Therefore
Conclusion: ohmic internal resistance:
Polarization resistance:
Claims (1)
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Cited By (8)
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CN102998538A (en) *  20121109  20130327  安凯  Internal resistance measurement interference removal method for storage battery 
CN103645382A (en) *  20131213  20140319  艾德克斯电子（南京）有限公司  Online battery internal resistance measuring apparatus and measuring method thereof 
CN104034967A (en) *  20140605  20140910  浙江工业大学  Method for rapidly and accurately detecting internal resistance of secondary battery 
CN104169731A (en) *  20120213  20141126  罗伯特·博世有限公司  Method for determining a current, battery management unit, battery and motor vehicle 
CN106125000A (en) *  20160818  20161116  中国电力科学研究院  A kind of method of testing of lithium battery ohmic internal resistance based on dipulse electric current 
CN107407712A (en) *  20141222  20171128  雷诺两合公司  For the method for the characteristic physical quantity for estimating battery 
CN108254690A (en) *  20161229  20180706  天津安源科技发展有限公司  A kind of battery polarization activity saturation degree detection device and method 
CN109752663A (en) *  20171101  20190514  微宏动力系统（湖州）有限公司  A kind of measurement method of the internal resistance of cell 
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CN1061289A (en) *  19901103  19920520  上海新宇电源厂  Battery internal resistance monopulse determination method 
JP2007179968A (en) *  20051228  20070712  Auto Network Gijutsu Kenkyusho:Kk  Battery status control device 
CN100498367C (en) *  20060907  20090610  长安大学  Electric vehicle accumulator internal resistance pulse detecting method 

2009
 20091009 CN CN2009101802047A patent/CN101692119B/en not_active IP Right Cessation
Cited By (8)
Publication number  Priority date  Publication date  Assignee  Title 

CN104169731A (en) *  20120213  20141126  罗伯特·博世有限公司  Method for determining a current, battery management unit, battery and motor vehicle 
CN102998538A (en) *  20121109  20130327  安凯  Internal resistance measurement interference removal method for storage battery 
CN103645382A (en) *  20131213  20140319  艾德克斯电子（南京）有限公司  Online battery internal resistance measuring apparatus and measuring method thereof 
CN104034967A (en) *  20140605  20140910  浙江工业大学  Method for rapidly and accurately detecting internal resistance of secondary battery 
CN107407712A (en) *  20141222  20171128  雷诺两合公司  For the method for the characteristic physical quantity for estimating battery 
CN106125000A (en) *  20160818  20161116  中国电力科学研究院  A kind of method of testing of lithium battery ohmic internal resistance based on dipulse electric current 
CN108254690A (en) *  20161229  20180706  天津安源科技发展有限公司  A kind of battery polarization activity saturation degree detection device and method 
CN109752663A (en) *  20171101  20190514  微宏动力系统（湖州）有限公司  A kind of measurement method of the internal resistance of cell 
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