CN103543411B - A kind of lithium battery voltage detection device - Google Patents
A kind of lithium battery voltage detection device Download PDFInfo
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- CN103543411B CN103543411B CN201310553223.6A CN201310553223A CN103543411B CN 103543411 B CN103543411 B CN 103543411B CN 201310553223 A CN201310553223 A CN 201310553223A CN 103543411 B CN103543411 B CN 103543411B
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- operational amplifier
- optical coupling
- linear optical
- lithium battery
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Abstract
The present invention relates to a kind of lithium battery voltage detection device, this device includes the first operational amplifier, linear optical coupling and the second operational amplifier, the normal phase input end of described first operational amplifier is connected with lithium battery, the outfan of the first operational amplifier is connected with described linear optical coupling by resistance, described linear optical coupling the first outfan and the in-phase input end of the second operational amplifier, the second outfan of described linear optical coupling is connected with the inverting input of described first operational amplifier.This device solves the dividing potential drop problem in current voltage detecting circuit by less resistors match, and the complexity of voltage detecting circuit is low, it is easy to miniaturization, uses low cost operational amplifier and light Rhizoma Nelumbinis isolating device to make low cost, high reliability simultaneously.
Description
Technical field
Invention relates to lithium battery management system, particularly relates to a kind of lithium battery voltage detection device.
Background technology
Lithium-ion battery pack managing system is all the state by set of cells judges, including the electricity of set of cells
Stream, temperature, voltage and internal resistance etc., the key during therefore the measurement of voltage becomes management system.
Monomer battery voltage measuring method has many at present, mainly can be summarized as divider resistance blood pressure lowering, floating ground measurement, mould
Intend the several methods such as switching gate.Virtual voltage is mainly decayed to measure chip by electric resistance partial pressure and can connect by electric resistance partial pressure method
The voltage range being subject to, then carries out analog digital conversion.This method measurement aspect, low cost, the life-span is long, but there is accumulation by mistake
Difference, and cannot eliminate.Along with increasing of cell number, monomer battery voltage measurement error can be along with the increase of common-mode voltage
Increase.During floating ground commercial measurement battery terminal voltage, the window comparator meeting current electronegative potential of automatic decision is the most suitable.If closed
Suitable directly initiate analog digital conversion and measure；If Tai Gao or the lowest, then electronegative potential is floated through digital-to-analogue by microcontroller
Dynamic control makes electronegative potential be under suitable state.The program is often changed by scene interference due to electronegative potential, it is impossible to low
Current potential accurately controls, and affects the measurement effect of whole system.The scheme using analog switch selects to survey by analog switch
Amount passage, each passage uses operational amplifier composition line sampling circuit.After needing the passage measured in Dang Xuan, simulation
The output of switch is sent into analog-digital converter through voltage follower and is carried out analog digital conversion.The method is according to series battery total voltage
Size, selects suitable amplification, it is not necessary to resistance pressure-dividing network or change electronegative potential just can directly measure any one electricity
The voltage in pond, it is convenient to measure.But the method needs large number of amplifier and precision-matched resistance, cost is high, and resistance
Dispersibility can cause measurement result dispersibility higher.
Summary of the invention
For above the deficiencies in the prior art, the present invention proposes a kind of lithium battery voltage detection device, by less electricity
Resistance coupling solves the dividing potential drop problem in current voltage detecting circuit, and the complexity of voltage detecting circuit is low, it is easy to miniaturization, simultaneously
Low cost operational amplifier and light Rhizoma Nelumbinis isolating device is used to make low cost, high reliability.
The purpose of the present invention is achieved through the following technical solutions:
A kind of lithium battery voltage detection device, this device includes that the first operational amplifier, linear optical coupling and the second computing are put
Big device, the normal phase input end of described first operational amplifier is connected with lithium battery, and the outfan of the first operational amplifier is by electricity
Resistance is connected with described linear optical coupling, and described linear optical coupling the first outfan and the in-phase input end of the second operational amplifier are described
Second outfan of linear optical coupling is connected with the inverting input of described first operational amplifier.
It is connected between outfan and second outfan of described linear optical coupling of described first operational amplifier and has an electric capacity.
It is connected by the first resistance between the in-phase input end of described first operational amplifier and described lithium battery, and described
It is connected between the in-phase input end of the first operational amplifier and ground and has the second resistance.
Described linear optical coupling is provided with a temperature compensation means.
Described temperature compensation means uses the resistance of positive temperature coefficient.
It is an advantage of the current invention that:
The problem that 1 less resistors match can solve mostly to there is resistors match in current voltage detecting circuit.
The complexity of the voltage detecting circuit of 2 inventions is low, it is easy to miniaturization.
3 low costs, high reliability, the design cost fluctuation of voltage detecting circuit is relatively big, and the design uses low cost computing
Amplifier and light Rhizoma Nelumbinis isolating device, to realize the testing circuit mode of low cost.
4 voltage detecting circuits can be used for the detection of many Battery packs tandem states, and voltage detecting circuit self can cascade, suitable
Together in modular development.
Accompanying drawing explanation
Fig. 1: cell voltage test philosophy figure；
Fig. 2: cell voltage test implementation illustration of the present invention.
Detailed description of the invention
If Fig. 1 is cell voltage test philosophy figure, test system is connected with set of cells and tests.Fig. 2 is the present invention
Cell voltage test implementation illustration.In figure, lithium battery voltage detection device includes the first operational amplifier TLE2022, linear optical coupling
TIL300 and the second operational amplifier TLE2022, the normal phase input end of described first operational amplifier TLE2022 and lithium battery E
Connecting, the outfan of the first operational amplifier is connected with described linear optical coupling TIL300 by resistance R6, described linear optical coupling
TIL300 the first outfan and the in-phase input end of the second operational amplifier TLE2022, the second outfan of described linear optical coupling
It is connected with the inverting input of described first operational amplifier.This detection device uses integrated transporting discharging and opto-coupler chip, and system has
There are higher precision and safety.
Described lithium battery E is the input of each monomer battery voltage, enters TLE2022 operational amplifier by R3, and computing is put
Big device output connects R6, enters linear optical coupling TIL300, and output signal enters detecting system by TLE2022 operational amplifier and enters
Row detection.
It is connected between the outfan and an outfan of linear optical coupling of the first operational amplifier and has an electric capacity C, this electric capacity C
It is possible to prevent circuit to produce concussion.The internal D0 of TIL300 is light emitting diode, and its operating current electricity If is chosen as 10mA.D1, D2
For light sensitive diode, they are excited generation electric current Ip1 and Ip2 respectively by D0, and its size is relevant with If:
Ip1=K1·If
Ip2=K2·If
Wherein K1·If、K2·IfShow Ip1, Ip2With IfChange, can be described as optical coupling function.Owing to D1, D2 are with identical
Technique make and be packaged together with D0, therefore, their optical coupling function Changing Pattern is consistent, therefore can set:
K can essentially be regarded as constant, the value of K is the electrical parameter of TIL300, and representative value is 1.Parameter value scope
It is 0.75～1.25..
U1 constitutes a reversed feedback amplifier, and the voltage of its in-phase input end and inverting input answers approximately equal, meets:
Vi > > Ip1 R1 (2)
U2 is a voltage follower, and output voltage V0 is equal to input terminal voltage:
Vi>>Ip2·R2(3)
Then the gain of circuit can be by
Due to ViVoltage be by after R3, R5 dividing potential drop input U1 hold in the same direction, so:
Then
Can be seen that output V0It is linear relationship with E.The V0 of output can send in single-chip microcomputer detection and process, each exchange height
The corresponding E value of voltage, the corresponding output voltage V0 of each E value.Whole circuit output voltage and the proportionate relationship of input current
Can be realized by regulation resistance R1, R2, R3, R5.
The present invention also is adapted for DC high-voltage circuit, when E is high direct voltage, just need to adjust the value of R2, R1, can at outfan
To obtain being suitable for the voltage of single-chip microcomputer detection.
Measuring according to reality, the precision comparison that this type of optocoupler exports under-10～+50 DEG C of operating ambient temperatures is high, performance
Therefore more stable be reliably to improve accuracy of detection, in systems addition temperature-compensating link, and temperature-compensating link uses positive warm
The resistance of degree coefficient, resistance raises with temperature, judges the situation of temperature by obtaining resistance, and by temperature
Measure, compensate output effect.
Vt=m(T-20)/T, as-10<t<when 50, m=0, as t<-10 or-t>50, regulates between m=0.01～0.05,
Final required monomer battery voltage is Vfo=Vo+Vt.
Should be appreciated that above is schematic by preferred embodiment to the detailed description that technical scheme is carried out
And it is nonrestrictive.Each embodiment can be remembered on the basis of reading description of the invention by those of ordinary skill in the art
The technical scheme carried is modified, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, and
The essence not making appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (3)
1. a lithium battery voltage detection device, it is characterised in that this device includes the first operational amplifier, linear optical coupling and
Two operational amplifiers, the normal phase input end of described first operational amplifier is connected with lithium battery, the output of the first operational amplifier
End is connected with described linear optical coupling by resistance, the homophase input of described linear optical coupling the first outfan and the second operational amplifier
End connect, the second outfan of described linear optical coupling is connected with the inverting input of described first operational amplifier, described linearly
Being provided with a temperature compensation means in optocoupler, described temperature compensation means uses the resistance of positive temperature coefficient.
A kind of lithium battery voltage detection device the most according to claim 1, it is characterised in that described first operational amplifier
Outfan and the second outfan of described linear optical coupling between be connected and have an electric capacity.
A kind of lithium battery voltage detection device the most according to claim 1, it is characterised in that described first operational amplifier
In-phase input end and described lithium battery between be connected by the first resistance, and the in-phase input end of described first operational amplifier
It is connected with between ground and has the second resistance.
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| CN201310553223.6A CN103543411B (en) | 2013-11-08 | 2013-11-08 | A kind of lithium battery voltage detection device |
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| CN201310553223.6A CN103543411B (en) | 2013-11-08 | 2013-11-08 | A kind of lithium battery voltage detection device |
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| CN103543411A CN103543411A (en) | 2014-01-29 |
| CN103543411B true CN103543411B (en) | 2016-09-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106772103A (en) * | 2017-02-24 | 2017-05-31 | 国网上海市电力公司 | A kind of state monitoring module of portable charger baby battery management system |
| CN107656208B (en) * | 2017-08-21 | 2020-01-31 | 上海空间电源研究所 | High-precision sampling integrated module for single voltage of storage battery for space |
| CN109031149B (en) * | 2018-08-30 | 2019-11-08 | 重庆长安汽车股份有限公司 | A kind of unitized method of realization storage battery sensor |
Citations (3)
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|---|---|---|---|---|
| US5712568A (en) * | 1995-09-05 | 1998-01-27 | Ford Motor Company | Battery voltage measurement system |
| CN102427256A (en) * | 2011-10-28 | 2012-04-25 | 山东大学 | Lithium battery pack management system of electric automobile |
| CN102854367A (en) * | 2012-09-26 | 2013-01-02 | 金海新源电气江苏有限公司 | Sensor used for detecting voltages of solar cell module |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5712568A (en) * | 1995-09-05 | 1998-01-27 | Ford Motor Company | Battery voltage measurement system |
| CN102427256A (en) * | 2011-10-28 | 2012-04-25 | 山东大学 | Lithium battery pack management system of electric automobile |
| CN102854367A (en) * | 2012-09-26 | 2013-01-02 | 金海新源电气江苏有限公司 | Sensor used for detecting voltages of solar cell module |
Non-Patent Citations (2)
| Title |
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| 基于线性光耦的蓄电池电压隔离测量技术;白思春等;《仪表技术》;20101231(第5期);第14页第3节及图3 * |
| 混合动力车电池管理系统的设计;王明坤等;《农业装备与车辆工程》;20131031;第51卷(第10期);第10页第2节及图2 * |
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