CN107664751A - The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery - Google Patents
The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery Download PDFInfo
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- CN107664751A CN107664751A CN201610605555.8A CN201610605555A CN107664751A CN 107664751 A CN107664751 A CN 107664751A CN 201610605555 A CN201610605555 A CN 201610605555A CN 107664751 A CN107664751 A CN 107664751A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
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Abstract
The invention provides a kind of measuring method of the real-time state-of-charge of battery, by the charge efficiency coefficient E, the health status value SOH and Pu Kete correction coefficient ω that obtain battery to be measurediCharge efficiency in the charging process of battery to be measured, influence of the discharge current size to battery SOC in health status and discharge process are assessed, improves direct ampere-hour cumulative method.Compared with prior art, the technical scheme of the measuring method has taken into full account the factor of the aging of the coulombic efficiency conversion in battery charging process, the actual discharge capacity in discharge process and battery, there is more scientific rational understanding to the state-of-charge of battery, can more accurately estimate the state-of-charge of battery；The stability of estimation is also improved simultaneously, is not in the situation that Kalman filtering diverging causes estimated value exception saltus step.Present invention also offers a kind of measuring and calculating device of the real-time state-of-charge of battery.
Description
Technical field
The present invention relates to technical field of battery management, the measuring method of storage battery charge state is related specifically to.The present invention
A kind of measuring and calculating device of the real-time state-of-charge of battery is further related to.
Background technology
Battery, particularly lead-acid accumulator are applied more and more as a kind of accumulation power supply of low-cost high-efficiency energy
In the communications field, have become the indispensable part of base station system, and state-of-charge (the State of of battery
Charge, SOC) measuring and calculating be the most important thing again.State-of-charge is also dump energy, and representative is that battery uses a period of time
Or the residual capacity after lying idle for a long time and the ratio of the capacity of its fully charged state, commonly use percentage and represent.Accurately
Battery SOC estimation not only contributes to implement some battery fine-grained management plans for the current state-of-charge of battery
Slightly, and it can farthest play the availability performance of battery and extend the service life of battery.
The technology of existing measuring and calculating battery SOC mainly has open circuit voltage method, Kalman filtering and direct ampere-hour cumulative method etc..
Open circuit voltage method needs battery to be tested in the tripped condition, and the battery in communication power supply is not fair as reserve battery
Perhaps battery open circuit, so open circuit voltage method be not suitable for communication power supply in battery SOC estimation on line.Kalman filtering method
Need have accurate estimation to the statistical property of noise in state equation and observational equation, otherwise can cause filter divergence, very
To obtaining abnormal battery SOC estimated value；On the other hand, Kalman filtering algorithm depends on the open-circuit voltage of battery, this
The constant-voltage phase caused in battery charging can not accurately estimate the state-of-charge of battery.Direct ampere-hour cumulative method is only electricity
Stream is accumulative with time product, does not account in efficiency transfer problem and the discharge process in charging process because discharge current is big
The small different influences to SOC, so as to cause error, worse this error can add up, and ultimately result in the SOC value of estimation
Failure.In addition, Kalman filtering and direct ampere-hour method do not account for influence of the battery aging to battery SOC yet.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of measuring method of the real-time state-of-charge of battery and measuring and calculating dress
Put, technical solution of the present invention fully have evaluated the health status (State of Health, SOH) of battery, combined charge process
In charge efficiency and discharge process in discharge current influence of the size to battery SOC, preferably improve existing peace
When cumulative method, can more accurately obtain the real-time SOC of battery.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of measuring method of the real-time state-of-charge of battery,
Using the real-time state-of-charge of ampere-hour cumulative method calculating accumulator, comprise the following steps：
Obtain the charge efficiency that battery to be measured corresponds to different charging currents；
Obtain the degree of aging of the battery to be measured；
Obtain discharge capacity rate of change of the battery to be measured under different discharge currents；
Changed by the state-of-charge of battery to be measured described in ampere-hour cumulative calculation, during calculating using the charge efficiency,
Degree of aging and discharge capacity rate of change amendment ampere-hour add up parameter.
Preferably, the amendment ampere-hour, which adds up parameter, includes：The charging process of the battery to be measured uses the aging
Degree and charge efficiency add up parameter to the ampere-hour of state-of-charge and are modified, and discharge process uses the degree of aging and electric discharge
Capacitance Shift Rate adds up parameter to the ampere-hour of state-of-charge and is modified.
It is further preferred that measuring the charge efficiency of the battery to be measured using charge efficiency coefficient E, E is battery
The ampere-hour being filled with adds up the ratio that electricity can be exchanged into discharge capacity, and value is 1 in discharge process；Using health status value SOH
The degree of aging of the battery to be measured is measured, SOH is the ratio of the actually available capacity of battery and nominal capacity；Using general gram
Special correction coefficient ωiMeasure the discharge capacity rate of change of the battery to be measured, ωiIt is battery respectively in nominal discharge current
Discharge capacity ratio lower and when being discharged under electric current i, value is 1 in charging process；By correcting described in ampere-hour cumulative calculation
State-of-charge change formula be：
Wherein, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points, Δ t
For the time interval between the k-1 time points and k time points；C is the nominal capacity of battery to be measured；I taken in charging process just,
Taken in discharge process negative.
Preferably, the step of demarcating battery charge efficiency coefficient E to be measured includes：Stored using the homotype of battery to be measured
Battery carries out charge-discharge test, and battery is discharged into default depth of discharge with nominal discharge current；Again respectively with selected
Charging current charges to battery the depth of charge of setting；Then battery discharging is preset to described with reference current again
Depth of discharge；The charge efficiency coefficient of this discharge and recharge of battery is：
E=(Q2/Q1) × 100%
Wherein, Q1The electricity being filled with for battery, Q2The electricity released for battery；Select the electric power storage of different degree of agings
Pond, and multiple different depth of discharges, charging current and depth of charge are chosen respectively, repeat the multiple charge and discharge electrical measurement
Examination, E is fitted with respect to battery previous discharge depth value DOD, health status value SOH and charging electricity according to the test data of acquisition
The function expression of stream.
Preferably, the step of estimating battery health status value SOH to be measured includes：First battery to be measured is put with specified
Then electric current constant-current discharge charges to blanking voltage to battery to be measured；Calibration coefficient η is set, when the current value of charging drops
During to η C, the actually available capacity of the ampere-hour aggregate-value as battery to be measured of electricity will be now filled with.
It is further preferred that the value of the calibration coefficient η takes 0.01
Preferably, demarcate battery Pu Kete correction coefficient ω to be measurediThe step of include：Battery to be measured is passed through into volume
Determine discharge current and multiple discharge currents smaller and larger than the nominal discharge current distinguish constant-current discharge to blanking voltage,
Battery to be measured discharge capacity actual under different discharge currents is obtained by ampere-hour cumulative calculation, electric power storage to be measured is calculated
The ω in pondiFrom the corresponding relation of different electric current i values.
Embodiments of the invention additionally provide a kind of measuring and calculating device of the real-time state-of-charge of battery, including respectively with it is to be measured
The voltage detection unit and current detecting unit of battery in parallel and serial, it is characterised in that also including Centralized Controller, its
In：
The Centralized Controller connects the voltage detection unit and current detecting unit；It is real that it is built-in with measuring and calculating battery
When state-of-charge measuring and calculating program, for controlling battery to be measured to carry out state-of-charge measuring and calculating, institute during charging and discharging
The step of stating measuring and calculating program includes：
Obtain the charge efficiency that battery to be measured corresponds to different charging currents；
Obtain the degree of aging of the battery to be measured；
Obtain discharge capacity rate of change of the battery to be measured under different discharge currents；
Changed by the state-of-charge of battery to be measured described in ampere-hour cumulative calculation, during calculating using the charge efficiency,
Degree of aging and discharge capacity rate of change amendment ampere-hour add up parameter.
Preferably, the measuring and calculating program specifically includes：The charging of the battery to be measured is measured using charge efficiency coefficient E
Efficiency, E are that the ampere-hour that battery is filled with adds up the ratio that electricity can be exchanged into discharge capacity；Measured using health status value SOH
The degree of aging of the battery to be measured, SOH are the ratio of the actually available capacity of battery and nominal capacity；Using Pu Kete schools
Positive coefficient ωiMeasure the discharge capacity rate of change of the battery to be measured, ωiFor battery respectively under nominal discharge current and
Discharge capacity ratio when being discharged under electric current i.
It is further preferred that the measuring and calculating program also includes：In battery charging process to be measured, by ωiIt is arranged to 1,
Electric current i is taken just, and E is calculated according to electric current i values；During battery discharging to be measured, E is arranged to 1, electric current i take it is negative, according to electricity
Flow i values and calculate ωi；The state-of-charge is obtained by the ampere-hour cumulative calculation of amendment to change：
Wherein, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points, Δ t
For the time interval between the k-1 time points and k time points；C is the nominal capacity of battery to be measured.
Still more preferably, in battery charging process to be measured, meet to calculate and update during default design conditions
SOH。
As the preferred of foregoing measuring and calculating device, include the display of the connection Centralized Controller.
Accumulator protecting unit that is preferred, in addition to being connected with battery to be measured as foregoing measuring and calculating device.
The embodiments of the invention provide new measuring and calculating battery SOC method and apparatus, its technical scheme used is logical
Cross in the health status (State of Health, SOH) for assessing battery, the charge efficiency in charging process and discharge process
Influence of the discharge current size to battery SOC, so as to improve the existing ampere-hour cumulative method of amendment.
Compared with prior art, above-mentioned technical proposal has the beneficial effect that：Take into full account in battery charging process
Influence of the actual discharge capacity to state-of-charge in coulombic efficiency conversion, the aging and discharge process of battery, to battery
State-of-charge have more scientific rational understanding, can more accurately estimate the SOC of battery；Also may be used simultaneously
To improve the stability of estimation result, the situation of estimated value exception saltus step caused by there is Kalman filtering diverging is avoided.
Brief description of the drawings
Fig. 1 is the basic step schematic diagram that the embodiment of the present invention calculates the real-time SOC of battery；
Fig. 2 is the flow chart that the embodiment of the present invention calculates real-time SOC；
Fig. 3 is the system connection figure when embodiment of the present invention carries out real-time SOC measuring and calculating；
Fig. 4 is using one of the SOC theoretical values measured by the inventive method embodiment method and estimated value comparison diagram；
Fig. 5 is two using the SOC theoretical values measured by the inventive method embodiment method and estimated value comparison diagram.
[main element symbol description]
1- Centralized Controllers；2- voltage detection units；3- current detecting units；4- displays；5- accumulator protecting units；
6- batteries to be measured；7- AC powers；8- rectifiers；9- is loaded.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in further detail to technical scheme.
The technical solution adopted by the present invention be by assess charge efficiency in the health status of battery, charging process and
Influence of the size of discharge current to battery charge state in discharge process, existing ampere-hour cumulative method is improved, so as to more accurate
The real-time SOC of true acquisition battery.
It is as shown in Figure 1 the method for the measuring and calculating storage battery charge state described in one embodiment of the invention, is added up using ampere-hour
Method calculates the real-time state-of-charge of battery to be measured, comprises the following steps：
S1. the charge efficiency that battery to be measured corresponds to different charging currents is obtained；
S2. the degree of aging of the battery to be measured is obtained；
S3. discharge capacity rate of change of the battery to be measured under different discharge currents is obtained；
S4. changed by the state-of-charge of battery to be measured described in ampere-hour cumulative calculation, imitated using the charging during calculating
Rate, degree of aging and discharge capacity rate of change amendment ampere-hour add up parameter；Add up the embodiment of parameter, institute as amendment ampere-hour
The charging process for stating battery to be measured adds up parameter progress using the degree of aging and charge efficiency to the ampere-hour of state-of-charge
Amendment, discharge process add up parameter to the ampere-hour of state-of-charge using the degree of aging and discharge capacity rate of change and repaiied
Just.
As specific embodiment, with the charge efficiency of the charge efficiency coefficient E measurements battery to be measured, with health
State value SOH measures the degree of aging of the battery to be measured；With Pu Kete correction coefficient ωiMeasure the battery to be measured with
Discharge capacity rate of change when electric current i discharges.
Embodiment includes：
1. demarcate charge efficiency coefficient E
Charge efficiency coefficient E refers to that the ampere-hour that battery is filled with adds up the ratio that electricity can be exchanged into discharge capacity, generally
As a percentage, its previous discharge depth (Depth of Discharge, DOD), SOH and electric current of charging with battery
Size is relevant.
Preferably the method for demarcation charge efficiency is in the embodiment of the present invention：
Charge-discharge test is carried out to the homotype battery with different SOH values, by battery with reference current IbaseElectric discharge
To default depth of discharge, the reference current IbaseFor nominal discharge current corresponding to battery nominal rate of discharge；Distinguish again
Battery is charged to by default depth of charge with selected charging current I, then again with IbaseBy battery discharging to institute
State default depth of discharge；Ampere-hour (Ah) electricity being filled with using battery is Q1, the ampere-hour electricity that battery is released is Q2, then store
This discharge and recharge of battery measuring and calculating charge efficiency be：
E=(Q2/Q1) × 100%
Different SOH battery is selected, and chooses multiple different DOD values, electric current I and depth of charge respectively, repeats
The multiple described charge-discharge test of row, charge efficiency coefficient E can be fitted on storage batteries D OD, SOH by analyzing test data
With charging current I relational expression, i.e. E=F (SOH, DOD, I) o
2. estimate health status value SOH
Health status value SOH refers to the ratio of the actually available capacity of battery and nominal capacity, can reflect the aging journey of battery
Degree.
The method that battery SOH value to be measured is preferably estimated in the embodiment of the present invention is：
First by battery to be measured with electric current IbaseThen constant-current discharge charges to blanking voltage to battery to be measured；Setting
Calibration coefficient η, when the current value of charging is down to η C, the ampere-hour aggregate-value of electricity will be now filled with as battery to be measured
The actually available capacity.C is the nominal capacity value of battery herein, and η C unit pacifies (A) for current unit.
3. demarcate Pu Kete correction coefficient ωi
The capacity of usual lead-acid accumulator changes with the size of discharge current, and Peukert proposed that plumbic acid stored in 1898
The empirical equation of relation between the capacity or discharge time and discharge current of battery, i.e. Pu Kete (Peukert) equation, it is expressed
Form is：
InT=K or C=KI1-n
In above formula, C represents the actually available capacity of battery, and t is discharge time, and I is discharge current, and n is Pu Kete constants,
Relevant with accumulator structure particularly electrode thickness, K is the constant for representing battery theoretical capacity, with active material in battery
Amount it is relevant.
General cut correction coefficient ωiRefer to electric discharge when battery discharges under nominal discharge current and under electric current i respectively to hold
Measure ratio, in the present embodiment using discharge capacity as specific currents under actually available capacity, can be pushed away by foregoing Peukert equation
Obtain below equation：
In above formula, CIRepresent the discharge capacity that battery can be released with electric current I constant-current discharges, CiRepresent battery with electric current i
The discharge capacity that constant-current discharge can release, n are Pu Kete constants to be measured, ωiFor Pu Kete correction coefficient；Above formula reflects
The relation of discharge capacity and discharge current, discharge current is bigger, and the capacity that battery is released is fewer；Discharge current is smaller, electric power storage
The capacity that pond releases is bigger；Wherein, CiIt is one of accurate estimation battery SOC necessary amount, will be obtained by multiple survey calculation
The n values gone out, which substitute into above formula, can try to achieve corresponding different electric current i CiValue；Take CIFor battery reference current is taken in discharge current I
IbaseWhen discharge capacity, discharge capacity C of the battery when being discharged with electric current i can be extrapolated according to electric current i valueiValue.
Pu Kete correction coefficient ω is preferably demarcated in the embodiment of the present inventioniMethod be：
Choose IbaseAnd other it is less than IbaseWith more than IbaseMultiple discharge currents, by storage battery constant-current discharge to cut
Only voltage, calculate the discharge capacity of multiple different current discharges；By the test data for analyzing multigroup discharge capacity, it is possible to anti-
The value for drawing n corresponding to different electric current i is pushed away, so as to obtain with IbaseOn the basis of the different electric current i of correspondence Pu Kete correction
Coefficient ωi。
4. calculating accumulator state-of-charge SOC
By above-mentioned steps 1 to 3, charge efficiency coefficient E, health status value SOH and Pu Kete correction system can be obtained
Number ωi, it is modified by the above-mentioned parameter parameter accumulative to ampere-hour, the formula of ampere-hour cumulative calculation SOC changes is：
In above formula, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points,
Time intervals of the Δ t between the k-1 time points and k time points；C is the nominal capacity of battery to be measured；As shown in above formula, storage to be measured
The real-time SOC value of battery is accumulated by by the segmentation SOC calculated respectively during charging and discharging, and SOC is calculated in the present embodiment
Idiographic flow it is shown in Figure 2, including：
Obtain the battery current i and Δ t to be measured between two measuring and calculating time points；Judge battery condition to be measured：
When battery to be measured is in charged state, charge efficiency coefficient E is calculated, with reference to the healthy shape to be measured measured in advance
State value SOH adds up parameter to ampere-hour and is modified, and calculates the SOC value change in charging process；When the design conditions for meeting SOH
When, calculate and update SOH, the SOH that calculating afterwards is based on after renewal is modified, and can more accurately obtain battery to be measured
SOC value；SOH design conditions are preset, such as may be set to timing calculating or other trigger conditions, such as battery to be measured follows
Ring number etc., can freely it be set as needed in specific implementation process；
When battery to be measured is in discharge condition, Pu Kete correction coefficient ω is calculatedi, with reference to SOH to the accumulative ginseng of ampere-hour
Number is modified, and calculates the SOC value change in discharge process；
SOC value increases over time in charging process, and SOC value reduces with the time in discharge process, and peace as described above
When accumulative parameter there is different amendments during charging and discharging, therefore when calculating SOC using above formula and changing, charged
Electric current i values are taken just in journey, and by ωiValue is set to constant 1；Electric current i values are taken in discharge process negative, and E values are set to constant
1。
Another embodiment of the present invention provides the measuring and calculating device using preceding method measuring and calculating battery SOC, as shown in figure 3,
Including the voltage detection unit 2 and current detecting unit 3 with battery 6 to be measured in parallel and serial, in addition to centralized Control respectively
Device 1, wherein：
The Centralized Controller 1 connects the voltage detection unit 2 and current detecting unit 3, its built-in measuring and calculating battery
Real-time SOC measuring and calculating program, can control battery 6 to be measured to carry out SOC measuring and calculating, the measuring and calculating program during charging and discharging
Measuring method according to foregoing SOC in real time is set, and its step includes：
Demarcate the charge efficiency coefficient E of battery 6 to be measured；Estimate the health status value SOH of battery 6 to be measured；Demarcation pair
The Pu Kete correction coefficient ω of induced current i battery to be measured 6i；In the charging process of battery 6 to be measured, by ωiIt is arranged to 1,
Electric current i takes just, calculates E according to electric current i values, and calculated when meeting default design conditions and update SOH；In battery to be measured
In 6 discharge processes, E is arranged to 1, electric current i takes negative, and ω is calculated according to electric current i valuesi；Use revised ampere-hour cumulative method meter
Calculate the state-of-charge change：
Wherein, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points, Δ t
For the time interval between the k-1 time points and k time points；C is the nominal capacity of battery 6 to be measured；
As optional embodiment, the Centralized Controller 1 can also connect other measuring cells, such as measure battery
Temperature measurement unit of temperature etc.；The measuring and calculating device also includes the display 4 for connecting the Centralized Controller 1, connects circuit
In can also increase the accumulator protecting unit 5 connected with battery 6 to be measured.
During the measuring and calculating device work, Centralized Controller 1 is responsible for voltage, the electricity that control each unit monitors battery 6 to be measured
Stream, temperature and the program for performing the built-in real-time SOC of measuring and calculating battery；Battery 6 to be measured and AC power 7 and rectifier 8
Loop connect when, start to charge up, Centralized Controller 1 start charging process SOC measuring and calculating；Battery 6 to be measured returns with load 9
When road is connected, start to discharge, the SOC measuring and calculating of the star t-up discharge process of Centralized Controller 1.
From the inconsistent common lead-acid accumulator of four groups of degree of agings as experimental subjects, the nominal appearance of the battery
Amount is 4 × 12V-100Ah, nominal rate of discharge 0.05C, is concretely comprised the following steps：
1. obtain charge efficiency Modulus E expressions
Charging current IchgChoose 0.1C, 0.15C and 0.2C；Depth of charge is with electric current IdeepValue is as mark, Ideep=C1
×Ichg, C10.7,0.5,0.2 and 0.1 is chosen to be respectively, charging current IchgIt is down to IdeepWhen think this charging complete；Setting
Default depth of discharge, i.e. DOD values are respectively 90%, 70%, 60% and 40%；Acquisition E can be fitted by measuring and calculation to be used as
The expression of the function of storage batteries D OD, SOH and electric current.
2. obtain health status value SOH value
Battery to be measured is charged with constant current-constant voltage mode, that is, the first stage of charging with constant current charge, works as voltage
Second stage is transferred to when reaching predetermined value and carries out constant-voltage charge, now charging current is gradually reduced, and charging current chooses 0.05C-
Value between 0.4C；When charging current is down to η C ampere-hours, it is the current SOH of battery to be measured to take ampere-hour aggregate-value now
Value；Wherein η is SOH calibration coefficients, and C is battery nominal capacity to be measured, and it is 0.01 that η values are chosen in the present embodiment.
3. obtain Pu Kete correction coefficient ωiWith i corresponding relation
The SOH value of the battery to be measured obtained in above-mentioned steps is defined, respectively choose 0.02C, 0.05C, 0.08C,
0.15C, 0.2C and 0.25C give battery discharging to be measured to blanking voltage, and record the total discharge capacity released every time respectively, press
N value can be calculated according to the formula of the foregoing discharge current derived by Peukert equation and discharge capacity；Possesses n value
Afterwards, it is possible to which Pu Kete correction coefficient ω is obtained according to the current value i of electric discharge in real timei。
4. calculate the SOC value of battery to be measured
According to calculating system is built shown in Fig. 3, the data obtained in above-mentioned steps 1 to 3 are defined, according to stream shown in Fig. 2
Journey calculates real-time SOC.
Using the method for above-described embodiment and E, SOH and ω of acquisitioniRelated data, can obtain such as Fig. 4 and Fig. 5 institutes
The battery SOC results of measuring shown.Abscissa represents time scale in figure, and unit is the second (s), and left ordinate scale represents battery
Voltage, unit are volt (V), and right ordinate scale represents the SOC value of battery；The curve of warning triangle represents battery tension, real
The curve of heart black dots mark is the SOC theoretical curves for emulating to obtain according to total capacity of discharging, and the curve of square indicia is use
The SOC curves of methods described of embodiment of the present invention estimation.
Fig. 4 be by battery be charged to 65% or so discharge again obtained by SOC theoretical values and estimated value comparison diagram, from figure
In as can be seen that estimated value and theoretical value worst error about 3%, meet actual operation requirements；
Fig. 5 be by battery be charged to 97% or so discharge again obtained by SOC theoretical values and estimated value comparison diagram, from figure
In as can be seen that estimated value and theoretical value error worst error about 4%, meet actual operation requirements.
Following table is shown using the ampere-hour cumulative method corrected in above-described embodiment with being surveyed respectively using direct ampere-hour cumulative method
Calculate the SOC of same battery discharging process result control：
As can be seen from the above table, the real-time SOC of battery survey is carried out using technical scheme provided in an embodiment of the present invention
During calculation, the error for measuring result is much smaller than the results of measuring of direct ampere-hour cumulative method, and technical scheme has obvious
Beneficial effect.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of measuring method of the real-time state-of-charge of battery, it is characterised in that comprise the following steps：
Obtain the charge efficiency that battery to be measured corresponds to different charging currents；
Obtain the degree of aging of the battery to be measured；
Obtain discharge capacity rate of change of the battery to be measured under different discharge currents；
Changed by the state-of-charge of battery to be measured described in ampere-hour cumulative calculation, using the charge efficiency, aging during calculating
Degree and discharge capacity rate of change amendment ampere-hour add up parameter.
2. measuring method according to claim 1, it is characterised in that the amendment ampere-hour, which adds up parameter, to be included：
The charging process of the battery to be measured adds up ginseng using the degree of aging and charge efficiency to the ampere-hour of state-of-charge
Number is modified, and discharge process adds up parameter to the ampere-hour of state-of-charge using the degree of aging and discharge capacity rate of change and entered
Row amendment.
3. measuring method according to claim 2, it is characterised in that：
The charge efficiency of the battery to be measured is measured using charge efficiency coefficient E, E is that the ampere-hour that battery is filled with adds up electricity
The ratio of discharge capacity is can be exchanged into, value is 1 in discharge process；
The degree of aging of the battery to be measured is measured using health status value SOH, SOH is the actually available capacity of battery and mark
Claim the ratio of capacity；
Using Pu Kete correction coefficient ωiMeasure the discharge capacity rate of change of the battery to be measured, ωiExist respectively for battery
Discharge capacity ratio when discharging under nominal discharge current and under electric current i, value is 1 in charging process；
It is by the formula for correcting state-of-charge change described in ampere-hour cumulative calculation：
<mrow>
<msub>
<mi>SOC</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msub>
<mi>SOC</mi>
<mrow>
<mi>k</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mrow>
<mi>E</mi>
<mo>&times;</mo>
<mi>i</mi>
<mo>&times;</mo>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>&times;</mo>
<msub>
<mi>&omega;</mi>
<mi>i</mi>
</msub>
</mrow>
<mrow>
<mi>C</mi>
<mo>&times;</mo>
<mi>S</mi>
<mi>O</mi>
<mi>H</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
</mrow>
Wherein, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points, Δ t is institute
State the time interval between k-1 time points and k time points；C is the nominal capacity of battery to be measured；I takes just in charging process, is discharging
During take it is negative.
4. measuring method according to claim 3, it is characterised in that demarcate battery charge efficiency coefficient E to be measured step
Suddenly include：
Charge-discharge test is carried out using the homotype battery of battery to be measured, battery is discharged into nominal discharge current default
Depth of discharge；Battery is charged to the depth of charge of setting with selected charging current respectively again；Then again with benchmark
Electric current is by battery discharging to the default depth of discharge；The charge efficiency coefficient of this discharge and recharge of battery is：
E=(Q2/Q1) × 100%
Wherein, Q1The electricity being filled with for battery, Q2The electricity released for battery；
The battery of different degree of agings is selected, and chooses multiple different depth of discharges, charging current and depth of charge respectively,
Repeat the multiple charge-discharge test, E is fitted with respect to battery previous discharge depth value according to the test data of acquisition
DOD, health status value SOH and charging current function expression.
5. measuring method according to claim 3, it is characterised in that estimate battery health status value SOH to be measured step
Suddenly include：
First then battery to be measured is charged with nominal discharge current constant-current discharge to blanking voltage to battery to be measured；Setting
Calibration coefficient η, when the current value of charging is down to η C, the ampere-hour aggregate-value of electricity will be now filled with as battery to be measured
The actually available capacity.
6. measuring method according to claim 5, it is characterised in that the value of the calibration coefficient η takes 0.01.
7. measuring method according to claim 3, it is characterised in that demarcate battery Pu Kete correction coefficient ω to be measuredi's
Step includes：
Battery to be measured is passed through into nominal discharge current and multiple discharge currents smaller and larger than the nominal discharge current
Constant-current discharge is put to blanking voltage by the way that ampere-hour cumulative calculation acquisition battery to be measured is actual under different discharge currents respectively
Capacitance, the ω of battery to be measured is calculatediFrom the corresponding relation of different electric current i values.
8. a kind of measuring and calculating device of the real-time state-of-charge of battery, including the electricity with battery to be measured (6) in parallel and serial respectively
Press detection unit (2) and current detecting unit (3), it is characterised in that also including Centralized Controller (1), wherein：
The Centralized Controller (1) connects the voltage detection unit (2) and current detecting unit (3)；It is built-in with measuring and calculating and stored
The measuring and calculating program of the real-time state-of-charge of battery, for controlling battery to be measured (6) to carry out charged shape during charging and discharging
State is calculated, and described the step of calculating program includes：
Obtain the charge efficiency of the corresponding different charging currents of battery to be measured (6)；
Obtain the degree of aging of the battery to be measured (6)；
Obtain discharge capacity rate of change of the battery to be measured (6) under different discharge currents；
Changed by the state-of-charge of battery to be measured (6) described in ampere-hour cumulative calculation, using the charge efficiency, old during calculating
Change degree and discharge capacity rate of change amendment ampere-hour add up parameter.
9. measuring and calculating device according to claim 8, it is characterised in that the measuring and calculating program specifically includes：
The charge efficiency of the battery (6) to be measured is measured using charge efficiency coefficient E, E is that the ampere-hour that battery is filled with adds up
Electricity can be exchanged into the ratio of discharge capacity；
The degree of aging of the battery (6) to be measured is measured using health status value SOH, SOH is the actually available capacity of battery
With the ratio of nominal capacity；
Using Pu Kete correction coefficient ωiMeasure the discharge capacity rate of change of the battery to be measured (6), ωiDistinguish for battery
Discharge capacity ratio when being discharged under nominal discharge current and under electric current i.
10. measuring and calculating device according to claim 9, it is characterised in that the measuring and calculating program also includes：
In battery to be measured (6) charging process, by ωi1 is arranged to, electric current i is taken just, and E is calculated according to electric current i values；In storage to be measured
In battery (6) discharge process, E is arranged to 1, electric current i takes negative, and ω is calculated according to electric current i valuesi；Added up by the ampere-hour of amendment
Calculate and obtain the state-of-charge change：
<mrow>
<msub>
<mi>SOC</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msub>
<mi>SOC</mi>
<mrow>
<mi>k</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>+</mo>
<mfrac>
<mrow>
<mi>E</mi>
<mo>&times;</mo>
<mi>i</mi>
<mo>&times;</mo>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>&times;</mo>
<msub>
<mi>&omega;</mi>
<mi>i</mi>
</msub>
</mrow>
<mrow>
<mi>C</mi>
<mo>&times;</mo>
<mi>S</mi>
<mi>O</mi>
<mi>H</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
</mrow>
Wherein, SOCkFor the SOC of k-th of time point, SOCk-1For the SOC of adjacent k-1 time points, Δ t is institute
State the time interval between k-1 time points and k time points；C is the nominal capacity of battery to be measured (6).
11. measuring and calculating device according to claim 10, it is characterised in that the measuring and calculating program also includes：
In battery (6) charging process to be measured, meet SOH is calculated and updated during default design conditions.
12. the measuring and calculating device according to any one of claim 8 to 11, it is characterised in that also include connecting the concentration control
The display (4) of device (1) processed.
13. the measuring and calculating device according to any one of claim 8 to 11, it is characterised in that also include and battery to be measured (6)
The accumulator protecting unit (5) of series connection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610605555.8A CN107664751A (en) | 2016-07-28 | 2016-07-28 | The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery |
| PCT/CN2017/091820 WO2018019101A1 (en) | 2016-07-28 | 2017-07-05 | Measurement method and measurement apparatus for real-time state of charge of storage battery, and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610605555.8A CN107664751A (en) | 2016-07-28 | 2016-07-28 | The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery |
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| Publication Number | Publication Date |
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| CN107664751A true CN107664751A (en) | 2018-02-06 |
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| CN201610605555.8A Pending CN107664751A (en) | 2016-07-28 | 2016-07-28 | The measuring method and measuring and calculating device of a kind of real-time state-of-charge of battery |
Country Status (2)
| Country | Link |
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| CN (1) | CN107664751A (en) |
| WO (1) | WO2018019101A1 (en) |
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