CN103884994B - A kind of prevent lithium ion battery from crossing the SOC on-line checking and modification method put - Google Patents

A kind of prevent lithium ion battery from crossing the SOC on-line checking and modification method put Download PDF

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CN103884994B
CN103884994B CN201410074838.5A CN201410074838A CN103884994B CN 103884994 B CN103884994 B CN 103884994B CN 201410074838 A CN201410074838 A CN 201410074838A CN 103884994 B CN103884994 B CN 103884994B
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soc
battery
curve
discharge
value
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CN103884994A (en
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蒋兴莉
谢皎
阮晓莉
蒋正伟
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Dongfang Electric Co., Ltd.
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Abstract

The invention discloses and a kind of prevent lithium ion battery from crossing the SOC on-line checking and modification method put, the method is not dependent on SOC on-line checking and the modification method of discharge-rate, by the process to different multiplying discharge curve, obtain unified decision condition, and accordingly battery SOC estimated value is modified.Use the method, it is possible to estimate battery SOC exactly, it is determined that battery is crossed and put characteristic point, while making full use of battery electric quantity, extend battery.

Description

A kind of prevent lithium ion battery from crossing the SOC on-line checking and modification method put
Technical field
The present invention relates to battery management system and electric car power supply equipment technical field, particularly relate to one and prevent lithium Ion battery crosses the SOC on-line checking and modification method put.
Background technology
Traditional energy is the most exhausted, and environmental pollution is day by day serious, and in order to tackle energy crisis, mitigation of global climate warms, Countries in the world propose energy-saving and emission-reduction and the policy of development low-carbon economy in succession.Lithium ion battery has energy density height, certainly puts Electricity is little, have extended cycle life, the advantage such as environmental pollution is low, memory-less effect, is widely used in portable unit energy-storage battery and electricity Electrical automobile electrokinetic cell field, and gradually extend to large solar system, peak load regulation network, household's electric power storage facility.
State-of-charge (State of Charge, SOC) is a highly important index during battery uses, generally It is defined as the ratio of the actual electricity that can be provided by and rated capacity under battery current state.Accurately grasp the SOC value of battery, it is possible to Give full play to the power performance of battery, and effectively prevent over-charging of battery and excessively put.For lithium ion battery, frequent and long Overcharge or cross and put and all battery can be caused damage, the most then reduce the service life of battery, heavy then security incidents such as initiation blast. Therefore, the SOC of lithium ion battery is accurately estimated, always battery management system (Battery Management System, BMS) vital task, the research emphasis that lithium ion battery is applied in electric automobile and energy storage field especially.
Current battery SOC estimation method includes open-circuit voltage method, ampere-hour integration method, internal resistance method, load method, nerve net Network method and Kalman filtering method etc..Wherein ampere-hour integration method has easy and simple to handle, can the advantage such as real-time online measuring, often adopted With.But it cannot provide SOC initial value, and when the condition of high temperature and current fluctuation are violent, error is bigger.Therefore, people often will peace Time integration method combine with additive method, SOC estimation is modified, thus improve SOC estimation accuracy.Such as, public Opening day is on October 09th, 2013, and the Chinese patent literature of Patent No. 201310261830.5 utilizes load method to obtain The SOC value that ampere-hour integration method is calculated by SOC value is modified;Publication date is on 07 06th, 2011, Patent No. Two SOC value being respectively adopted open-circuit voltage method and the acquisition of ampere-hour integration method are entered by the Chinese patent literature of 200980130989.5 Row weighted average, estimates cell health state;Publication date is on 06 05th, 2013, in Patent No. 201310031309.2 State's patent documentation establishes the four-dimensional list of temperature, load voltage, discharge current and current integration, by acquisition iron phosphate of tabling look-up The SOC value of lithium battery.
Method in above-mentioned patent all proposes for a certain discharge-rate.But, in actual application, due to temperature, The impact of the factors such as electric current, the discharge-rate of battery is the most non-constant.Accordingly, it would be desirable to a kind of SOC not relying on discharge-rate exists Line detection and modification method, it is judged that battery is crossed and put characteristic point and revise its SOC value, extend electricity while making full use of battery electric quantity Pond service life.
Summary of the invention
The present invention is directed to battery actual application in discharge-rate non-constant cause SOC estimate inaccurate problem, it is provided that A kind of preventing lithium ion battery from crossing the SOC on-line checking and modification method put, the method is not dependent on the SOC of discharge-rate and exists Line detection and modification method, by the process to different multiplying discharge curve, it is thus achieved that unified decision condition, and accordingly to battery SOC estimation is modified.Use the method, it is possible to estimate battery SOC exactly, it is determined that battery is crossed and put characteristic point, fully Battery is extended while utilizing battery electric quantity.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
A kind of prevent lithium ion battery from crossing the SOC on-line checking and modification method put, it is characterised in that: include following step Rapid:
A. obtaining the V-SOC curve under different discharge-rate, described V-SOC curve is with the longitudinal axis as voltage, and transverse axis is for holding The voltage-capacity curve that amount builds;
Based on the V-SOC curve of the different discharge-rates B. obtained in step A, the magnitude of voltage of neighbouring sample point is entered Row mathematic interpolation, obtains each multiplying power corresponding DV-SOC curve, translates described DV-SOC curve and vertical coordinate conversion, and Moving to overlap, the curve post after overlapping is designated as 3rd DV-SOC curve;
C. according to the 3rd DV-SOC curve obtained, choose suitable 3rd DV value, mark A point and B point is low as SOC Value point and SOC high level point, thus obtain the SOC threshold range in each region in V-SOC curve;
D. use ampere-hour integration method that battery SOC is carried out on-line checking, be labeled as SOCi, record cell voltage V simultaneouslyi, and Calculate corresponding 3rd DV value;
E. according to the V in step Di, the SOC threshold scope that is given of 3rd DV and step C is to the SOC in step DiValue is carried out Revise, the revised SOC of final output.
The acquisition of the V-SOC curve under different discharge-rates in described step A, comprises the following steps:
A1. battery is fully charged, voltage reaches ceiling voltage, and electric current minimizes electric current;
A2. using battery testing cabinet, measure and record fully charged battery under different discharge-rates, cell voltage is with putting The situation of change of electricity time, and battery releasing electricity is with the situation of change of discharge time;
A3. the electricity situation of change with discharge time is released according to above-mentioned battery, in conjunction with the computing formula of SOC,, obtain the SOC situation of change with discharge time;
A4. according to above-mentioned cell voltage with the situation of change of discharge time, and SOC is with the situation of change of discharge time, Obtain the V-SOC curve under different discharge-rate.
In described step B, the acquisition of 3rd DV-SOC curve comprises the steps:
B1. the DV-SOC curve under different discharge-rate, wherein DV=k (V are calculatedi-Vi+1), k is arbitrary constant, ViFor front The magnitude of voltage that one moment measured, Vi+1The magnitude of voltage measured for later moment in time, DV represents adjacent two sampled points in V-SOC curve Voltage difference relation;
B2. by the DV-SOC curve under different discharge-rates, translate on the basis of the DV-SOC curve of 1C discharge-rate, The land regions making each multiplying power DV-SOC curve overlaps, and the curve post after translation is designated as level DV-SOC curve;Wherein Level DV is DV value after translation transformation, and described land regions is that DV changes minimum region with SOC value;
B3. by the level DV-SOC curve under different discharge-rates, with the level DV-SOC of 1C discharge-rate On the basis of curve, vertical coordinate is reduced, obtain the 3rd DV-SOC curve under different discharge-rate;Reducing formula is:, wherein said I is battery discharge current, C0For the rated capacity of battery, 3rd DV For level DV value after above-mentioned change.
To SOC in described step EiThe makeover process of value, comprises the following steps:
C1. according to the V of detectioniValue and corresponding 3rd DV value of calculation, it is judged that battery is in the V-SOC curve described in step A In residing region;
C2. the SOC of ampere-hour integration method detection is comparediThe SOC threshold model in region residing for the battery that value and above-mentioned steps judge Enclose, it may be judged whether be modified;
If c3. SOCiValue, in threshold range, is not modified, correction value SOC=SOCi
If c4. SOCiValue is not in threshold range, then according to the institute in V-SOC curve of the battery described in above-mentioned steps c1 Region, place and corresponding SOC threshold scope are modified, and correction algorithm is as follows:
(1) battery is on the left of B point, correction value SOC=SOC1
(2) battery is on the right side of B point, correction value SOC=SOCi-a;
(3) battery is on the right side of A point, correction value SOC=SOC0
(4) battery is on the left of A point, correction value SOC=SOCi+b;
SOC recited above1And SOC0For SOC high point threshold value and the SOC low spot threshold value of battery, a and b is SOC correction.
The present invention only need to carry out simple process to the V-SOC curve under different discharge-rates, so that it may obtains unified judgement Condition and SOC threshold scope, and then the SOC value of ampere-hour integration method on-line checking is modified, improve the standard of battery SOC estimation Exactness.The invention provides a kind of simple, do not rely on SOC on-line checking and the modification method of discharge-rate, it is possible to have In the actual application of effect solution battery, discharge-rate is non-constant causes SOC to estimate inaccurate problem, effectively prevents battery from crossing and puts, carries High battery uses safety.
Accompanying drawing explanation
Fig. 1 is MT battery V-SOC curve under different discharge-rates;
Fig. 2 is MT battery DV-SOC curve under different discharge-rates;
Fig. 3 is MT battery level DV-SOC curve under different discharge-rates;
Fig. 4 is MT battery 3rd DV-SOC curve under different discharge-rates;
Fig. 5 is the schematic diagram utilizing the A point demarcated and B point to divide V-SOC curve;
Fig. 6 is the schematic flow sheet of the present invention.
Detailed description of the invention
The present invention is further illustrated below in conjunction with specific embodiment.
Embodiment is a kind of prevents lithium ion battery from crossing the SOC on-line checking and modification method put, and comprises the steps of
A, the V-SOC curve obtained under different discharge-rate, realized by following steps:
(1) using constant current to turn constant voltage mode by fully charged for LiMn2O4 lithium titanate (MT) battery of 11 Ah, constant current is 11 A(1C charges), ceiling voltage threshold value is 2.8 V, and minimum current threshold value is 0.15 A;
(2) use battery testing cabinet, measure and record fully charged battery different discharge-rates (1C, 2C, 3C, 4C, Under 5C), cell voltage is with the situation of change of discharge time, and battery releases the electricity situation of change with discharge time, data acquisition Collection time interval is 3 s;
(3) according to above-mentioned battery releasing electricity with the situation of change of discharge time, formula is utilized, calculate battery SOC, obtain the SOC situation of change with discharge time;
(4) according to above-mentioned cell voltage with the situation of change of discharge time, and SOC is with the situation of change of discharge time, Obtain the V-SOC curve under different discharge-rate, as shown in Figure 1.
B, according to the V-SOC curve (Fig. 1) under discharge-rates different in step A, calculate the DV-under different discharge-rate SOC curve;Wherein said DV=k (Vi-Vi+1), k is that arbitrary constant (takes k=10 in this example4), ViThe electricity measured for previous moment Pressure value, Vi+1The magnitude of voltage measured for later moment in time, (such as: such as Vi+1For with ViMagnitude of voltage after being spaced 3 seconds), DV is V-SOC The voltage difference relation of adjacent two sampled points in curve, as shown in Figure 2;
DV-SOC curve under above-mentioned different discharge-rates is made on the basis of the platform of 1C discharge-rate DV-SOC curve Translation, makes the land regions of each multiplying power DV-SOC curve overlap, and described land regions is that DV changes minimum region with SOC value, Curve post after translation is designated as level DV-SOC curve, and in this example, translation formula is:
Wherein said I is battery discharge current, and level DV is DV value after translation transformation, is derived from different electric discharge Level DV-SOC curve under multiplying power, as shown in Figure 3;
By the level DV-SOC curve under above-mentioned different discharge-rates with the level DV-SOC curve of 1C discharge-rate On the basis of vertical coordinate is reduced, reducing formula is:
Wherein said I is battery discharge current, and 3rd DV is level DV numerical value after vertical coordinate reduces conversion, from And obtain the 3rd DV-SOC curve under different discharge-rate, as shown in Figure 4.
C, can be seen that from 3rd DV-SOC curve (Fig. 4), each rate discharge curves is flat in electric discharge after above-mentioned series of processes Platform is closer to, platform both sides flex point Relatively centralized.During in order to find unified characteristic point effectively to revise different multiplying electric discharge Battery SOC, it is higher and as far as possible close to platform end points that the choosing of platform flex point should meet each curve of double curvature registration.Can by Fig. 4 The effective span knowing the 3rd DV of platform flex point is 6 to 10.Here as a example by choosing 3rd DV=10, thus can mark in the diagram Make the SOC low value characteristic point under different discharge-rate and SOC high level characteristic point (A point and B point).Each curve of double curvature A point in Fig. 4 With the SOC value of B point as shown in 1# battery in table 1.
Table 1 shows 4 batteries (numbered 1#, 2#, 3#, 4#) A point and SOC value of B point under different discharge-rates.In table not Under same battery, different discharge-rate, A point is less with the SOC value deviation of B point, shows A point and the B demarcated with the method for the invention Point has higher concordance.This provides reliable basis for finding the unified decision condition not relying on discharge-rate.
V-SOC curve described in step A is divided into three regions, such as Fig. 5 according to A point and the B point demarcated in step E Shown in.
The data of reference table 1, put for effectively preventing battery from crossing, and choosing SOC low spot threshold value is 6.5%, and SOC high point threshold value is 97%, the most trizonal SOC threshold scope is respectively as follows: I district, 97% SOC 100%;II district, 6.5% < SOC < 97%;III district, 0% £SOC£6.5%。
D, the conventional ampere-hour integration method of employing carry out on-line checking to battery SOC, are labeled as SOCi, record cell voltage simultaneously Vi, and calculate corresponding 3rd DV value.
V in E, foundation step Di, the SOC threshold scope that is given of 3rd DV and step C is to the SOC in step DiValue is carried out Revise, the revised SOC of final output.
To SOCiThe makeover process of value, comprises the following steps:
(1) according to the V of detectioniValue and corresponding 3rd DV value of calculation judge that battery is in the V-SOC curve described in step A Residing region;
(2) SOC of ampere-hour integration method detection is comparediThe SOC threshold model in region residing for the battery that value and above-mentioned steps judge Enclose, it may be judged whether be modified;
(3) if SOCiValue, in threshold range, is not modified, correction value SOC=SOCi
(4) if SOCiValue is not in threshold range, then according to the battery described in above-mentioned steps (1) in V-SOC curve Residing region and corresponding SOC threshold scope are modified, and correction algorithm is as follows:
A) battery is on the left of B point, correction value SOC=97%;
B) battery is on the right side of B point, correction value SOC=SOCi-2%;
C) battery is on the right side of A point, correction value SOC=6.5%;
D) battery is on the left of A point, correction value SOC=SOCi+4%;
Above-described Rule of judgment and modification method, may be used to judge statement comprehensive description:
1.IF Vi ³ 2.38 and 3rd ΔV ³ 10 and SOCi ³ 97% , SOC= SOCi;
2.IF Vi ³ 2.38 and 3rd ΔV ³ 10 and SOCi < 97% , SOC= 97%;
3.IF Vi ³ 2.38 and 3rd ΔV < 10 and SOCi < 97% , SOC= SOCi;
4.IF Vi ³ 2.38 and 3rd ΔV < 10 and SOCi ³ 97% , SOC= SOCi -2%;
5.IF Vi < 2.38 and 3rd ΔV ³ 10 and SOCi £ 6.5% , SOC= SOCi;
6.IF Vi < 2.38 and 3rd ΔV ³ 10 and SOCi > 6.5% , SOC=6.5%;
7.IF Vi < 2.38 and 3rd ΔV < 10 and SOCi > 6.5% , SOC= SOCi;
8.IF Vi < 2.38 and 3rd ΔV < 10 and SOCi £ 6.5% , SOC= SOCi+4%;
9.Others, error.
The ultimate principle of the present invention:
In advance lithium ion battery is measured, it is thus achieved that the V-SOC curve under different discharge-rates;V-SOC curve is entered Row series of processes, it is thus achieved that 3rd DV-SOC curve, thus find the unified decision condition not relying on discharge-rate, by V-SOC Curve is divided into three regions and provides the SOC threshold scope in each region.During lithium ion battery work, gather the electric discharge electricity of battery Stream I and cell voltage Vi, and by conventional ampere-hour integration method estimation battery charge state SOCi.By measuring the V of gainediValue and Corresponding 3rd DV value of calculation judges the battery residing region in the V-SOC curve being obtained ahead of time, and according to the SOC in this region The threshold range SOC to estimationiValue is modified, and final exports revised SOC value of battery, Whole Work Flow such as Fig. 6 institute Show.
The above embodiment is only that the preferred embodiments to the present invention is described, it is clear that the present invention's is concrete Realization is not subject to the restrictions described above.On the premise of designing spirit without departing from the present invention, those of ordinary skill in the art couple The various deformation of technical scheme work and improvement, all within protection scope of the present invention.

Claims (4)

1. one kind prevents lithium ion battery from crossing the SOC on-line checking and modification method put, it is characterised in that: comprise the following steps:
A. obtaining the V-SOC curve under different discharge-rate, described V-SOC curve is with the longitudinal axis as voltage, and transverse axis is charged shape Voltage-state-of-charge curve that state builds;
Based on the V-SOC curve of the different discharge-rates B. obtained in step A, poor to the magnitude of voltage of neighbouring sample point Value calculates, and obtains each discharge-rate corresponding △ V-SOC curve, described △ V-SOC curve is carried out translation and makes each discharge-rate The land regions of △ V-SOC curve overlap, then carry out vertical coordinate conversion, and it is bent that curve obtained is labeled as 3rd △ V-SOC Line;Described land regions is that △ V changes minimum region with SOC value;
C. according to the 3rd △ V-SOC curve obtained, choose suitable 3rd △ V, mark A point and B point as SOC low value point and SOC high level point, thus obtain the SOC threshold range in each region in V-SOC curve;
D. use ampere-hour integration method that SOC is carried out on-line checking, be labeled as SOCi, record V simultaneouslyi, and calculate corresponding 3rd △ V;
E. according to the V in step Di, the SOC threshold scope that is given of 3rd △ V and step C is to the SOC in step DiIt is modified, Export revised SOC eventually.
The most according to claim 1 preventing lithium ion battery from crossing the SOC on-line checking and modification method put, its feature exists In: the acquisition of the V-SOC curve under different discharge-rates in described step A, comprise the following steps:
A1. battery is fully charged, voltage reaches ceiling voltage, and electric current minimizes electric current;
A2. using battery testing cabinet, measure and record fully charged battery under different discharge-rates, voltage is with discharge time Situation of change, and battery releasing electricity is with the situation of change of discharge time;
A3. the electricity situation of change with discharge time is released according to above-mentioned battery, in conjunction with the computing formula of SOC,Obtain the SOC situation of change with discharge time;
A4. according to above-mentioned voltage with the situation of change of discharge time, and SOC is with the situation of change of discharge time, obtains difference V-SOC curve under discharge-rate.
The most according to claim 1 preventing lithium ion battery from crossing the SOC on-line checking and modification method put, its feature exists In: in described step B, the acquisition of 3rd △ V-SOC curve comprises the steps:
B1. the △ V-SOC curve under different discharge-rate, wherein △ V=k × (V are calculatedi-Vi+1), k is arbitrary constant, △ V table Show the voltage difference relation of adjacent two sampled points in V-SOC curve;
B2. by the △ V-SOC curve under different discharge-rates, translate on the basis of the △ V-SOC curve of 1C discharge-rate, make The land regions of each discharge-rate △ V-SOC curve overlaps, and the curve post after translation is designated as level △ V-SOC curve;Wherein Level △ V is △ V value after translation transformation, and described land regions is that △ V changes minimum region with SOC;
B3. by the level △ V-SOC curve under different discharge-rates, on the basis of the level △ V-SOC curve of 1C discharge-rate, will Vertical coordinate reduces, and obtains the 3rd △ V-SOC curve under different discharge-rate;Reducing formula is: Wherein said I is battery discharge current, C0For the rated capacity of battery, 3rd △ V is level △ V value after above-mentioned change.
The most according to claim 1 preventing lithium ion battery from crossing the SOC on-line checking and modification method put, its feature exists In: to SOC in described step EiMakeover process, comprise the following steps:
C1. according to the V of detectioniAnd corresponding 3rd △ V, it is judged that the battery residing region in the V-SOC curve described in step A;
C2. the SOC of ampere-hour integration method detection is comparediThe SOC threshold scope in region residing for the battery judged with above-mentioned steps, it is judged that Whether it is modified;
If c3. SOCiIn the range of SOC threshold, it is not modified, correction value SOC=SOCi
If c4. SOCiNot in the range of SOC threshold, then according to the residing district in V-SOC curve of the battery described in above-mentioned steps c1 Territory and corresponding SOC threshold scope are modified, and correction algorithm is as follows:
(1) battery is on the left of B point, correction value SOC=SOC1
(2) battery is on the right side of B point, correction value SOC=SOCi-a;
(3) battery is on the right side of A point, correction value SOC=SOC0
(4) battery is on the left of A point, correction value SOC=SOCi+b;
SOC recited above1And SOC0For SOC high point threshold value and the SOC low spot threshold value of battery, a and b is SOC correction.
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