CN105183934B - A kind of tandem type battery system modeling method based on parameter correction device - Google Patents
A kind of tandem type battery system modeling method based on parameter correction device Download PDFInfo
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- CN105183934B CN105183934B CN201510417103.2A CN201510417103A CN105183934B CN 105183934 B CN105183934 B CN 105183934B CN 201510417103 A CN201510417103 A CN 201510417103A CN 105183934 B CN105183934 B CN 105183934B
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Abstract
The tandem type battery system modeling method based on parameter correction device that the invention discloses a kind of, which is by N number of battery cell by being connected in series.The method is as follows：According to known lithium-ion battery monomer performance parameter, utilize series circuit working characteristics and screening method, establish a battery system mean value model, the state-of-charge SOC of the difference and mean value model that recycle battery system terminal voltage measured value and mean value model terminal voltage simulation value carrys out design parameter corrector, finally using by the SOC obtained by parameter correction device as input, the mathematics relationship for coming each battery cell performance parameter and battery system performance parameter in undated parameter mean value model establishes tandem type battery system model.The tandem type battery system model that the present invention is established can more effectively simulate the charge/discharge operation characteristic of tandem type battery system, and the modeling method invented both had been applicable to battery cell series connection burst mode, was also suitable battery module series connection burst mode.
Description
Technical field
The invention belongs to MW grades of battery energy storage system designs and control technology fields in intelligent grid, are related to a kind of based on ginseng
The tandem type battery system modeling method of number corrector.
Background technology
Lithium ion battery because have the characteristics that it is higher than energy, have extended cycle life, low self-discharge, memory-less effect, it is more next
More it is widely used in the fields such as new energy, traffic, space flight.Simultaneously as the rated capacity of lithium-ion battery monomer, specified electricity
Pressure etc. is relatively small, and multiple battery cells are often concatenated composition battery system, i.e. tandem type battery system, it can be achieved that battery system
The expansion for capacity and the voltage class of uniting.However since there are inconsistencies for battery cell, and the performance parameter of lithium ion battery is (such as
Battery terminal voltage, internal resistance, capacity etc.) easily influenced by factors such as charge-discharge magnification, temperature, lead to the series connection containing a large amount of battery cells
The working characteristics of type battery system is more with accurate characterization, the serious exploitation and application for restricting battery system.Therefore, it is accurate to establish
Tandem type battery system model its working characteristics and performance parameter is effectively predicted, it is designed, control and engineer application extremely
It closes important.
Currently, focus mostly in terms of battery cell about the research of fuel cell modelling and patent both at home and abroad, main modeling side
Method includes electrochemical model, analysis model and equivalent-circuit model etc., and wherein equivalent-circuit model is because of intuitive, simple, physics meaning
Justice it is clear the advantages that and be widely used in electrical engineering field.Research and patent about the modeling of tandem type battery system is opposite
It is less, it mostly uses and determines parameter predigesting model to model, because not considering shadow of the battery inconsistency to battery system performance parameter
It rings, causes its model accuracy limited.
Invention content
Problems solved by the invention is to be to provide a kind of tandem type battery system modeling method based on parameter correction device,
It is not consistent and lead to its battery performance parameter (such as voltage, electricity to solve each battery cell performance parameter in tandem type battery system
Stream etc.) and charge-discharge characteristic the problem of being difficult to be accurately, estimating, reach the charge and discharge of Accurate Prediction tandem type battery system
The purpose of working characteristics.
Purpose of the present invention is to be achieved through the following technical solutions：
The present invention provides a kind of tandem type battery system, which is concatenated by N number of battery cell.
A kind of tandem type battery system modeling method based on parameter correction device is as follows：According to known lithium-ion battery monomer
Performance parameter determines mean parameter model using series circuit working characteristics and screening method, then obtains mean parameter model
Input of the parameter as battery model recycles Kirchhoff's law KVC to establish battery model.Battery system terminal voltage is measured
Value U* and mean value model terminal voltage simulation value USDifference and mean value model state-of-charge SOCIAs input, a ginseng is designed
Number corrector.It finally will be by the SOC obtained by parameter correction devicebAs input, carry out each battery cell in undated parameter mean value model
The mathematics relationship of performance parameter and battery system performance parameter, then through battery model, to establish tandem type battery system model.
Established tandem type battery system mean parameter model is second order equivalent-circuit model.By Kirchhoff's law KVC
Obtaining battery model expression formula is：U (t)=Ub0[SOC(t)]-Ib(t)Zb(t).It is true using series circuit working characteristics and screening method
The mean parameter model of fixed each battery cell performance parameter and battery system performance parameter determines as follows：It is electric in mean parameter model
The open terminal voltage of cell system calculates as follows：Wherein, U0i(SOC) i-th of battery is indicated
Monomer open terminal voltage；The impedance computation of battery system is as follows in mean parameter model：
The design of the parameter correction device is as follows：By the terminal voltage actual value U for detecting battery system*With mean value model end
Voltage USBe compared, difference recycle lithium ion battery in its workbench area battery terminal voltage U and SOC similar to line
Sexual intercourse obtains correction value delta SOC, and specific calculating is as follows：In formula, kSOCIt is for correction
Number.Finally by the SOC obtained by correction value delta SOC and SOC moduleIAfter addition, the input quantity SOC new as mean parameter modelb,
To update battery system performance parameter.
With it is unused adopt parameter correction device compared with, the present invention has beneficial technique effect below：When entire discharge process,
The battery system equivalent-circuit model that the present invention is carried can accurately predict the working characteristics of battery system；Second is that initial in electric discharge
Phase and latter stage all more accurately follow experimental data, precision of prediction higher.
Description of the drawings
Fig. 1 is tandem type battery system structure schematic diagram；
Fig. 2 is battery cell equivalent-circuit model figure；
Fig. 3 is tandem type battery system mean parameter illustraton of model；
Fig. 4 is the tandem type battery system model structure based on parameter correction device；
Fig. 5-1~Fig. 5-2 is SOC0Battery constant-current discharge characteristic when different, wherein Fig. 5-1 become for battery cell terminal voltage
Change situation, Fig. 5-2 is the front and back comparative situation of tandem type battery system terminal voltage correction；
Fig. 6-1~Fig. 6-2 is SOC0Cell pulse discharge characteristic when different, wherein Fig. 6-1 become for battery cell terminal voltage
Change situation, Fig. 6-2 is the front and back comparative situation of tandem type battery system terminal voltage correction.
Specific implementation mode
With reference to specific example, the present invention is described in further detail, it is described for explanation of the invention without
It is to limit.
1, tandem type battery system and battery cell model
1.1 tandem type battery systems
Tandem type battery system is concatenated by 3 battery cells, and structure chart is as shown in Figure 1.Each battery list
The rated voltage of body is 3.7V, rated capacity 860mAh, discharge cut-off voltage 3V.
1.2 battery cell equivalent-circuit models
Battery cell equivalent-circuit model is second order equivalent-circuit model, and model main circuit is by 2 RC parallel circuits, controlled
Voltage source U0(SOC) and the compositions such as internal resistance of cell R, circuit diagram is as shown in Fig. 2, mathematical model expression formula is：U (t)=U0[SOC
(t)]-I(t)[R(t)+Rs(t)/Rs(t)jωCs(t)+Rl(t)/Rl(t)jωCl(t)], in formula, U0(SOC)、Rs(t)、Rl(t)
And Cs(t)、Cl(t) calculating difference is as follows：
2, tandem type battery system equivalent-circuit model
The design of the parameter correction device is as follows：The terminal voltage actual value U of battery system is detected first*With mean value model
Terminal voltage US, then pass through formulaCalculate to obtain correction value delta SOC, kSOCValue is 1, finally will
The correction value delta SOC and SOC obtained by SOC moduleISOC is obtained after additionb, the input quantity new as mean parameter model, to update electricity
Cell system performance parameter establishes new battery system model.Fig. 4 is the tandem type battery system model knot based on parameter correction device
Composition.
3, model emulation result and Contrast on effect
L-G simulation test includes mainly constant current and two kinds of operating modes of pulse, and battery discharge current is 0.8A, pulse when constant-current discharge
Load current, which changes, when electric discharge is：Start time with 0.8A constant current operation 600s, after standing 600s later, then with 0.8A constant current works
Make 600s, so recycles.The initial capacity of initial time, 3 battery cells is unequal, i.e. SOC initial simultaneously differs, point
It Wei 1,0.95,0.9.Fig. 5 is SOC0Battery constant-current discharge characteristic when different, wherein Fig. 5-1 change for battery cell terminal voltage
Situation, Fig. 5-2 are the front and back comparative situation of tandem type battery system terminal voltage correction.Discharge initial time, due to each battery cell
SOC0And it is different, corresponding end voltage initial value is also different, SOC0Higher, terminal voltage initial value is higher；Particularly, SOC0It is minimum
Battery cell reach discharge cut-off voltage (3V) at first, and terminate electric discharge；Work as SOC0When minimum battery cell stops electric discharge,
Tandem type battery system also terminates to discharge；In entire discharge process, school is compared using the simulation result (red line) after parameter correction device
Simulation result (black line) before just especially discharges latter stage closer to experimental data (dotted line), it was demonstrated that carried model it is accurate
Property.
Fig. 6 is SOC0Cell pulse discharge characteristic when different, wherein Fig. 6-1 are battery cell terminal voltage situation of change, figure
6-2 is the front and back comparison of tandem type battery system terminal voltage correction.SOC0Minimum battery cell reaches blanking voltage at first and ties
Beam discharge；In addition to initial terminal voltage is different, three battery cell flash-over characteristics are almost the same.In entire discharge process, after correction
Battery model simulation result (red line) with correction before simulation result (black line) always closer to experimental data (dotted line), especially
Electric discharge latter stage, further demonstrate proposed model pulse operation also can Accurate Prediction tandem type battery system operation spy
Property.
Claims (1)
1. a kind of tandem type battery system modeling method based on parameter correction device, it is characterised in that the tandem type battery system
System is by N number of battery cell by being connected in series, and wherein N is the natural number more than 1；
It the described method comprises the following steps：
According to known lithium-ion battery monomer performance parameter, mean parameter mould is determined using series circuit working characteristics and screening method
Type recycles Kirchhoff's law KVC to establish battery then using mean parameter model parameters obtained as the input of battery model
Model；
By battery system terminal voltage measured value U* and mean value model terminal voltage simulation value USDifference and mean value model state-of-charge
SOCIAs input, a parameter correction device is designed, parameter correction device design is as follows：Battery system terminal voltage is obtained first to survey
Magnitude U*With mean value model terminal voltage simulation value US, then pass through formulaCorrection value delta SOC is calculated to obtain,
In formula, kSOCFor correction coefficient, then by the SOC obtained by correction value delta SOC and SOC moduleIThe output of parameter correction device is obtained after addition
SOCb；
It finally will be by the SOC obtained by parameter correction devicebAs input, carry out each battery cell performance ginseng in undated parameter mean value model
The mathematics relationship of number and battery system performance parameter, then through battery model, to establish tandem type battery system model.
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| JP2012133757A (en) * | 2010-12-10 | 2012-07-12 | Dspace Digital Signal Processing & Control Engineering Gmbh | Method and device for simulating battery in real time |
| CN104657520A (en) * | 2013-11-18 | 2015-05-27 | 国家电网公司 | Battery modeling method based on large capacity energy accumulation lithium ion battery |
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| JP2012133757A (en) * | 2010-12-10 | 2012-07-12 | Dspace Digital Signal Processing & Control Engineering Gmbh | Method and device for simulating battery in real time |
| CN104657520A (en) * | 2013-11-18 | 2015-05-27 | 国家电网公司 | Battery modeling method based on large capacity energy accumulation lithium ion battery |
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