CN105785270B - A kind of battery pack string energy state traffic coverage measurement method - Google Patents
A kind of battery pack string energy state traffic coverage measurement method Download PDFInfo
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Abstract
The present invention provides a kind of battery pack string energy state traffic coverage measurement method, includes the following steps：One invariable power discharge test is carried out to battery pack string, lower limit value is run according to the energy state of battery pack string voltage change ratio and the cell voltage very poor determination invariable power；The invariable power charge test is carried out to the battery pack string, upper limit value is run according to the energy state of battery pack string voltage change ratio and the cell voltage very poor determination invariable power；Lower limit value is run by the energy state and the energy state runs upper limit value, determines the traffic coverage of battery pack string energy state.It is very poor by voltage when measurement battery pack string charge and discharge and cell voltage, it can analyze the battery pack string energy state traffic coverage obtained under a certain power, for the energy state traffic coverage for assessing energy-storage units available power, it grasps energy-storage units charging and discharging capabilities and provides technological means, the offer of the parameter (energy state traffic coverage) is of great significance for the accurate control of energy-storage units and energy-accumulating power station.
Description
Technical field
The present invention relates to a kind of battery status detection fields, and in particular to a kind of battery pack string energy state traffic coverage survey
Amount method.
Background technique
As wind-powered electricity generation, photovoltaic engineering are continuously increased, energy storage technology is as inhibiting generation of electricity by new energy fluctuation, intermittent
Effective means is also rapidly developed.Energy-storage units are the basic unit for forming energy-accumulating power station, the multiple battery packs of energy-storage units
Series-parallel composition, as shown in figure 15.
SOE (State Of Energy, energy state, hereinafter referred to as SOE) traffic coverage is the important operation of energy-storage units
Parameter, SOE range of operation is wider, and the charge/discharge capacity that energy-storage units can provide is more, and SOE range of operation is narrower, can be with
The charge/discharge capacity of offer is fewer.Since energy-storage units are made of multiple battery pack strings, energy-storage units SOE traffic coverage is by electricity
Pond group string SOE is determined, therefore measuring battery pack string SOE traffic coverage is determining energy-storage units SOE range of operation, assesses energy storage list
The important parameter of first service ability.Simultaneously as different charge-discharge electric powers correspond to different SOE traffic coverages, therefore the present invention
A kind of energy-storage lithium battery group string SOE traffic coverage measurement method for constant charge-discharge electric power is proposed, for measurement energy storage lithium electricity
Pond group string SOE traffic coverage provides reference.
Summary of the invention
The object of the present invention is to provide a kind of battery pack string SOE traffic coverage measurement methods, by analyzing in a constant function
The voltage curve and the very poor curve of cell voltage for carrying out charge and discharge under the conditions of rate to measurement battery pack string, obtain battery under the power
The SOE traffic coverage of group string, to assess the SOE traffic coverage of battery pack string available power and grasping battery pack string charging and discharging capabilities
Technical support is provided.
The technical solution of the present invention is to provide a kind of battery pack string SOE traffic coverage measurement methods, include the following steps：
One invariable power discharge test is carried out to battery pack string, it is very poor really according to battery pack string voltage change ratio and cell voltage
The energy state of the fixed invariable power runs lower limit value；
The invariable power charge test is carried out to the battery pack string, according to battery pack string voltage change ratio and cell voltage
The energy state of the very poor determination invariable power runs upper limit value；
Lower limit value is run by the energy state and the energy state runs upper limit value, determines battery pack string energy shape
The traffic coverage of state.
It is very poor by voltage when measurement battery pack string charge and discharge and cell voltage, it can analyze the electricity obtained under a certain power
Pond group string SOE traffic coverage grasps energy-storage units charging and discharging capabilities for the SOE traffic coverage for assessing energy-storage units available power
Technological means is provided, the offer of the parameter (SOE traffic coverage) has the accurate control of energy-storage units and energy-accumulating power station
It is significant.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.In the accompanying drawings：
Fig. 1 is the flow chart of SOE traffic coverage measurement method in the present invention.
Battery pack string voltage and voltage change ratio curve when Fig. 2 is invariable power electric discharge in the present invention.
Fig. 3 is PNGV model battery structure in the present invention.
Cell voltage very poor curve when Fig. 4 is invariable power electric discharge in the present invention.
Battery pack string voltage and voltage change ratio curve when Fig. 5 is invariable power charging in the present invention.
Cell voltage very poor curve when Fig. 6 is invariable power charging in the present invention.
Battery pack string voltage-power curve when Fig. 7 is 42kW invariable power charging in the embodiment of the present invention.
Battery pack string voltage-SOE curve when Fig. 8 is 42kW invariable power charging in the embodiment of the present invention.
Battery pack string voltage-change rate curve when Fig. 9 is 42kW invariable power charging in the embodiment of the present invention.
Cell voltage very poor-SOE curve when Figure 10 is 42kW invariable power electric discharge in the embodiment of the present invention.
Battery pack string voltage-power curve when Figure 11 is 42kW invariable power electric discharge in the embodiment of the present invention.
Battery pack string voltage-SOE curve when Figure 12 is 42kW invariable power electric discharge in the embodiment of the present invention.
Battery pack string Voltage-voltage change rate curve when Figure 13 is 42kW invariable power electric discharge in the embodiment of the present invention.
Cell voltage very poor-SOE curve when Figure 14 is 42kW invariable power charging in the embodiment of the present invention.
Figure 15 is energy-storage units composition schematic diagram in the prior art.
Specific embodiment
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, with reference to the accompanying drawing to this hair
Bright embodiment is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Fig. 1 provides a kind of battery pack string SOE traffic coverage measuring method flow chart for the present invention, includes the following steps：
S101；One invariable power discharge test is carried out to battery pack string, according to battery pack string voltage change ratio and cell voltage
The energy state of the very poor determination invariable power runs lower limit value；
S102；The invariable power charge test is carried out to the battery pack string, according to battery pack string voltage change ratio and electricity
The energy state of the cell voltage very poor determination invariable power runs upper limit value；
S103；Lower limit value is run by the energy state and the energy state runs upper limit value, determines battery pack string
The traffic coverage of energy state.
It is described that an invariable power discharge test is carried out to battery pack string in one embodiment of the invention, according to battery pack string voltage
Lower limit value is run with the SOE of the cell voltage very poor determination invariable power, including：Electricity in the period is expected to obtain in discharge platform
Buckling rate average value Δ Udis, when the voltage change ratio of electric discharge latter stage battery pack string reaches 2 × Δ UdisCorresponding SOE value,
SOE runs lower limit value SOE when determining the discharge powermin1。
It is described that an invariable power discharge test is carried out to battery pack string in one embodiment of the invention, according to battery pack string voltage
Lower limit value is run with the SOE of the cell voltage very poor determination invariable power, further includes：When discharging, latter stage cell voltage is very poor to be reached
Limit value URdisWhen, the very poor U of cell voltage at this timeRdisCorresponding SOE value, SOE runs lower limit value when determining the discharge power
SOEmin2。
In one embodiment of the invention, if SOEmin1<SOEmin2, then it is SOE that SOE, which runs lower limit value,min2。
If SOEmin1>SOEmin2, then it is SOE that SOE, which runs lower limit value,min1。
It is described that the invariable power charge test is carried out to the battery pack string in one embodiment of the invention, according to battery pack
The SOE of string voltage and the cell voltage very poor determination invariable power runs upper limit value, including：The time is expected to obtain in charging platform
Voltage change ratio average value Δ U in sectionch, when the voltage change ratio of latter stage of charging battery pack string reaches 2 × Δ UchCorresponding
SOE value, energy state runs upper limit value SOE when determining the charge powermax1。
It is described that the invariable power charge test is carried out to the battery pack string in one embodiment of the invention, according to battery pack
The SOE of string voltage and the cell voltage very poor determination invariable power runs upper limit value, further includes：When electric discharge latter stage cell voltage pole
Difference reaches limit value URchWhen, the very poor U of cell voltage at this timeRchCorresponding SOE value, energy state is run when determining the charge power
Upper limit value SOEmax2。
In one embodiment of the invention, if SOEmax1<SOEmax2, then it is SOE that SOE, which runs upper limit value,max1。
If SOEmax1>SOEmax2, then it is SOE that SOE, which runs upper limit value,max2。
It is very poor by voltage when measurement battery pack string charge and discharge and cell voltage, it can analyze the electricity obtained under a certain power
Pond group string SOE traffic coverage grasps energy-storage units charging and discharging capabilities for the SOE traffic coverage for assessing energy-storage units available power
Technological means is provided, the offer of the parameter (SOE traffic coverage) has the accurate control of energy-storage units and energy-accumulating power station
It is significant.
Hereinafter SOE operation upper lower limit value will be calculated by the way that charging and discharging process is described in detail respectively.
(1) determination of SOE operation lower limit when battery pack string invariable power P discharges
A) determine that SOE runs lower limit according to battery pack string voltage
Discharge test is carried out to battery pack string with invariable power P, according to battery pack string voltage, calculates battery pack string voltage change
Rate, and draw battery pack string voltage and voltage change ratio curve is as shown in Figure 2.
Fig. 3 is PNGV model battery structure in the present invention.As shown in figure 3, UOCFor ideal voltage source, battery open circuit electricity is indicated
Pressure, it is only related with battery SOE, and it is unrelated with battery charging condition；R0For battery ohmic internal resistance, only with the metals such as battery electrode column
Component is related；RPFor battery polarization resistance, CPBattery polarization capacitor, the situation that polarizes in charge and discharge process with battery are related；CbIt is main
To be used to describe battery in the variation of charge or discharge initial stage voltage.From the figure 3, it may be seen that in battery pack string discharge process,
Battery terminal voltage UI is by battery open circuit voltage UOC, ohmic voltage U0, capacitance voltage UbAnd polarizing voltage UPComposition, such as 1 formula institute
Show.
UI=UOC-U0-Ub-UP (1)
It can be seen that the latter stage in discharge process, since SOE is varied less, U in conjunction with Fig. 3 and 1 formulaOCIt is basically unchanged, simultaneously
Electric discharge curent change very little, U under invariable power charge mode0In electric discharge latter stage also without significant change, other CbEnergy putting
The electric initial stage has discharged, UbIt is 0 in electric discharge latter stage, therefore in electric discharge latter stage end voltage UIVariation major embodiment be polarization
Voltage UPVariation.In electric discharge latter stage since fundamental reaction finishes cell active materials, discharge capability weakens, and polarization phenomena add
Play leads to polarizing voltage UPIt sharply increases, so as to cause end voltage UIDecline rapidly, therefore charge and discharge are being carried out with invariable power
Cheng Zhong, as end voltage UIRapidly when decline, battery has been difficult to discharge, and corresponding SOE is the electric discharge SOE operation of the power at this time
Lower limit.
Figure it is seen that stablizing in discharge platform phase battery status, voltage of the battery pack string voltage within the unit time
Variation is relatively stable, so as to acquire the average value Δ U of voltage change ratio in the perioddis.When electric discharge latter stage battery pack string
Voltage change ratio reach 2 × Δ Udis, both thought that the end voltage of battery pack string at this time started to decline rapidly, voltage change ratio limit
2 Δ U of valuedisCorresponding SOE both ran lower limit SOE for the SOE of the power determined by battery pack string voltagemin1。
During actual measurement, voltage change ratio curve will appear such as the noise in Fig. 2, obstruction plateau voltage change
Rate Δ UdisThe 2 Δ U of determination and voltage change ratio limit value of numerical valuedisThe determination of position on voltage change ratio curve.It can be to electricity
Buckling rate data are filtered, and are rejected the noise on curve, and carry out piecewise fitting to curve, are obtained smooth voltage change
Rate curve, so that it is determined that Δ Udis2 Δ U of size and voltage change ratio limit valuedisThe position of appearance.
B) lower limit is run according to the very poor determining SOE of cell voltage
Discharge test is carried out to battery pack string with invariable power P, it is very poor according to cell voltage, calculate the very poor variation of cell voltage
Rate, and it is very poor as shown in Figure 4 with change rate curve to draw cell voltage.
Since battery pack string single battery discharge performance has differences, in electric discharge latter stage, the battery polarization effect of performance difference
Can more other batteries become apparent from, voltage decline also can more other batteries faster, so that it is very poor to increase cell voltage.Work as cell voltage
When very poor quick variation, due to the minimum single battery active material of voltage end of reaction, it is difficult to continue to discharge, affect whole
The discharge performance of group battery pack string electric discharge, corresponding SOE is the electric discharge SOE operation lower limit of the power at this time.
From fig. 4, it can be seen that when discharging, latter stage cell voltage is very poor to reach limit value URdisWhen, it is both living for minimum voltage battery
Property substance is at the time of fundamental reaction finishes, at this time the very poor U of cell voltageRdisCorresponding SOE had both been very poor by cell voltage
The SOE of the identified power runs lower limit SOEmin2, the very poor limit value U of cell voltageRdisIt is provided by producer, the electricity of different manufacturers
The very poor limit value U of cell voltageRdisIt is different.
In the very poor measurement process of actual cell voltage, if " burr " occurs in the very poor curve of cell voltage, it can also be used pair
The mode of voltage change ratio data processing obtains the very poor curve of smooth cell voltage, so that it is determined that the very poor limit value of cell voltage
URdisThe position occurred on curve.
C) battery pack string SOE runs the determination of lower limit
Take SOEmin1And SOEmin2In biggish value, the operation lower limit SOE of battery pack string SOE as under the powermin。
(2) determination of SOE operation upper limit when battery pack string invariable power P charges
A) determine that SOE runs the upper limit according to battery pack string voltage
It is charged with invariable power P to battery pack string, according to battery pack string voltage during test, calculates battery pack string electricity
Buckling rate, and draw battery pack string voltage and voltage change ratio curve is as shown in Figure 5.
It is similar with discharge process, it can be in the hope of charging platform phase voltage change ratio average value Δ U according to Fig. 5ch, with 2 × Δ
UchAs latter stage of charging battery pack string voltage change ratio limit value, corresponding SOE was both determined by by cell voltage is very poor at this time
The charge power under SOE run upper limit SOEmax1。
B) upper limit is run according to the very poor determining SOE of cell voltage
It is charged with invariable power P to battery pack string, very poor according to cell voltage during test, data calculate battery electricity
Very poor change rate is pressed, and it is very poor as shown in Figure 6 with change rate curve to draw cell voltage.
It is similar with discharge process, with URchAs the very poor limit value of charged battery voltage, corresponding SOE had both been by electricity at this time
SOE under the charge power determined by cell voltage is very poor runs upper limit SOEmax2.Under normal circumstances, battery electricity in discharge process
Press very poor limit value URdisWith the very poor limit value U of cell voltage in charging processRchIt is identical.
C) battery pack string SOE runs the determination of the upper limit
Take SOEmax1And SOEmax2In lesser value, the operation upper limit SOE of battery pack string SOE as under the powermax。
In conclusion running lower limit value and SOE operation upper limit value by the SOE, the fortune of battery pack string SOE is determined
Row section.
The present invention is specifically described below with reference to a specific embodiment, however, it should be noted that the specific reality
Example is applied merely to better describing the present invention, is not constituted improper limitations of the present invention.
By taking a certain battery pack string as an example, illustrate the determination of the battery pack string SOE traffic coverage, the major parameter of battery pack string
Such as table 1.
1 battery pack string parameter of table
(1) SOE when 42kW invariable power dischargesminDetermination
A) SOE is determined according to battery pack string voltagemin1
It is discharged with 42kW invariable power the battery pack string, battery pack string voltage-power curve such as Fig. 7, battery pack string
Voltage-SOE curve such as Fig. 8, battery pack string voltage-change rate such as Fig. 9.As shown in figure 9, discharge platform phase voltage change ratio is average
It is worth Δ UdisFor -0.3V/s, discharge 2 Δ U of latter stage battery pack string voltage change ratio limit valuedisFor -0.6V/s, battery pack string is electric at this time
Press UdisFor 634V, corresponding battery pack string runs lower limit SOEmin1It is 12%.
B) SOE is determined according to battery pack string voltagemin2
It is discharged with 42kW invariable power the battery pack string, the very poor-SOE curve such as Figure 10 of cell voltage.It discharges latter stage,
The very poor limit value U of cell voltageRdisFor 100mV, corresponding battery pack string runs lower limit SOE at this timemin2It is 17%.
C) battery pack string SOEminDetermination
Take SOEmin1=12% and SOEmin2Biggish value in=17%, battery pack string SOE under 42kW powerminIt is 17%.
(2) SOE when 42kW invariable power chargesmaxDetermination
A) SOE is determined according to battery pack string voltagemax1
It is charged with 42kW invariable power to the battery pack string, battery pack string voltage-power curve such as Figure 11, battery pack string
Voltage-SOE curve such as Figure 12, battery pack string voltage-change rate such as Figure 13.As shown in figure 13, charging platform phase voltage change ratio
Average value Δ UchFor 0.3V/s, 2 Δ U of latter stage of charging battery pack string voltage change ratio limit valuechFor 0.6V/s, battery pack string at this time
Voltage UchFor 701V, corresponding battery pack string runs upper limit SOEmax1It is 87%.
B) SOE is determined according to battery pack string voltagemax2
It is charged with 42kW invariable power to the battery pack string, the very poor-SOE curve such as Figure 14 of cell voltage.Latter stage of charging,
The very poor limit value U of cell voltageRchFor 100mV, corresponding battery pack string runs upper limit SOE at this timemax2It is 87%.
C) battery pack string SOEmaxDetermination
Take SOEmax1Lesser value in=87% and SOEmax2=87%, battery pack string SOE under 42kW powermaxFor
87%.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (1)
1. a kind of battery pack string energy state traffic coverage measurement method, which is characterized in that include the following steps：
One invariable power discharge test is carried out to battery pack string, according to the very poor determining institute of battery pack string voltage change ratio and cell voltage
State the energy state operation lower limit value of invariable power；
The invariable power charge test is carried out to the battery pack string, it is very poor according to battery pack string voltage change ratio and cell voltage
Determine the energy state operation upper limit value of the invariable power；
Lower limit value is run by the energy state and the energy state runs upper limit value, determines battery pack string energy state
Traffic coverage；
Wherein, described that an invariable power discharge test is carried out to battery pack string, it is very poor really according to battery pack string voltage and cell voltage
The energy state of the fixed invariable power runs lower limit value, including：Discharge platform expect in the period voltage change ratio it is flat
Mean value Δ Udis, when the voltage change ratio of electric discharge latter stage battery pack string reaches 2 × Δ UdisCorresponding energy state value, determining should
Energy state runs lower limit value SOE when discharge powermin1；When discharging, latter stage cell voltage is very poor to reach limit value URdisWhen, it is electric at this time
The very poor U of cell voltageRdisCorresponding energy state value, energy state runs lower limit value SOE when determining the discharge powermin2；If
SOEmin1<SOEmin2, then energy state operation lower limit value is SOEmin2；If SOEmin1>SOEmin2, then energy state runs lower limit value
For SOEmin1；
Wherein, described that the invariable power charge test is carried out to the battery pack string, according to battery pack string voltage and cell voltage
The energy state of the very poor determination invariable power runs upper limit value, including：Charging platform expect in the period voltage become
Rate average value Δ Uch, when the voltage change ratio of latter stage of charging battery pack string reaches 2 × Δ UchCorresponding energy state value,
Energy state runs upper limit value SOE when determining the charge powermax1；When discharging, latter stage cell voltage is very poor to reach limit value URchWhen,
The very poor U of cell voltage at this timeRchCorresponding energy state value, energy state runs upper limit value when determining the charge power
SOEmax2；If SOEmax1<SOEmax2, then energy state operation upper limit value is SOEmax1；If SOEmax1>SOEmax2, then energy state
Operation upper limit value is SOEmax2。
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