CN105676131B - A kind of vanadium cell dynamic battery charge state estimation method based on charge-discharge energy efficiency - Google Patents
A kind of vanadium cell dynamic battery charge state estimation method based on charge-discharge energy efficiency Download PDFInfo
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- CN105676131B CN105676131B CN201511029410.XA CN201511029410A CN105676131B CN 105676131 B CN105676131 B CN 105676131B CN 201511029410 A CN201511029410 A CN 201511029410A CN 105676131 B CN105676131 B CN 105676131B
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- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 33
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003068 static effect Effects 0.000 claims abstract description 22
- 238000011156 evaluation Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 8
- 230000004907 flux Effects 0.000 claims description 2
- 238000011160 research Methods 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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Abstract
Vanadium cell dynamic SOC based on charge-discharge energy efficiencydBattery work is divided into charging process and discharge process, the energy content of battery is divided into charged side energy and discharge side energy accordingly by evaluation method；Charged side energy is mapped as discharge side energy by the efficiency for charge-discharge of battery under different electric currents, obtains battery static state SOCs；Using baseline load discharge capacity as reference energy, according to static SOCsWith the dynamic SOC under this load of the discharge capacity estimation battery of battery under different loadsd, specific steps are as follows: (1) charged the battery respectively using different electric currents, obtain the efficiency of battery under different electric currents, and then obtain battery static state SOCs；(2) it is discharged using different loads battery, obtains functional relation of the different loads releasable energy with respect to reference load, and then obtain the dynamic SOC of batteryd。
Description
Technical field
The present invention relates to a kind of all-vanadium flow battery SOC (battery charge state) evaluation methods, and it is micro- to be mainly used in direct current
In power grid, battery charged side energy is mapped to discharge side by relationship between efficiency to obtain battery static state SOCs, with baseline load
Discharge capacity is as reference energy, according to static SOCsWith the load herein of the discharge capacity estimation battery of battery under different loads
Under dynamic SOCd。
Background technique
Energy and environment are two hang-ups of world today's facing, and the appearance of micro-capacitance sensor is to solve this two hang-up to mention
New thinking is supplied.Micro-capacitance sensor is by Distributed-generation equipment, energy storage device, load and its relevant control, protection equipment etc.
The low capacity power supply system of composition.As the important component of micro-capacitance sensor, energy storage device is for stabilizing the function of micro-grid system
Rate and energy fluctuation improve the stability and schedulability of system, improve power quality etc. and play an important role.Quan Fan
Flow battery with its with it is environmental-friendly, have extended cycle life, securely and reliably, the advantages such as extensive energy storage can be achieved, obtained more next
More applications.
SOC estimation is one of the core content of battery management system research, directly affects the power control and energy of battery
Buret reason.The research of SOC is required to the problem of two aspects of reflection: 1. determine that can battery work on, i.e., it is static charged
State SOCsResearch；2. reflecting that battery maintains the time of current working status, i.e. dynamic state-of-charge SOCdResearch.
All-vanadium flow battery is applied in micro-capacitance sensor, mainly the power of stabilizing system and energy fluctuation, improves system
Stability and schedulability absorb extra energy and power when system capacity, power are extra, lack in system capacity, power
The energy and power shortage of system are filled up when mistake.Therefore, energy storage device is always in charge or discharge state, and research can also be with
It is divided into charging and discharging two parts.Constant-current discharge is mostly used for the research of discharge portion at present；And constant current is mostly used when charging
Constant voltage mode is charged to certain voltage using constant current mode, is then charged using constant current mode, until electric current drops to
Certain value.In direct-current grid, operating condition is more complicated when battery works, and electric current changes constantly when charging, and when discharging
Need to connect DC/DC, and the factors such as SOH of charge-discharge magnification, temperature, cycle-index, battery also will affect the essence of SOC estimation more
Degree, therefore method proposed by the present invention is more suitable for the operating condition of battery in micro-capacitance sensor.
Summary of the invention:
The object of the present invention is to which the application conditions according to vanadium cell in direct-current grid, propose one kind and are suitble to full vanadium
The method of flow battery SOC estimation.
The technical scheme is that the vanadium cell dynamic SOC based on charge-discharge energy efficiencydEvaluation method, by battery
Work is divided into charging process and discharge process, and the energy content of battery is divided into charged side energy and discharge side energy accordingly；By not
Charged side energy is mapped as discharge side energy by the efficiency for charge-discharge with battery under electric current, obtains battery static state SOCs；With benchmark
Load discharge capacity is as reference energy, according to static SOCsBattery is estimated herein with the discharge capacity of battery under different loads
Dynamic SOC under loadd, specific steps are as follows:
(1) it is charged the battery respectively using different electric currents, obtains the efficiency of battery under different electric currents, and then obtain electricity
Pond static state SOCs；
1) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium
Battery keeps rotation hot stand-by duty；10 minutes are stood, 1C electric discharge is then carried out with reference load, until reaching electric discharge cut-off item
Stop electric discharge when part, obtains battery charge reference energy WcnWith electric discharge reference energy Wdn。
2) 10 minutes are stood, then respectively with the different total 5-8 charging current of electric current 0.1-1C (such as 30A, 40A, 50A,
60A, 70A, 80A) it charges, start reduced moment stopping charging when voltage reaches upper limit current, obtains the different electricity of battery
The rechargeable energy W flowed downc；10 minutes are stood, 1C electric discharge is then carried out with reference load, is stopped until reaching electric discharge cut-off condition
Electric discharge, obtains the discharge energy W under the different electric currents of batteryd；
3) efficiency of battery under battery difference electric current is acquired with formula (1):
By battery efficiency η (i) fitting under different electric currents, the function of battery efficiency under different electric currents is obtained:
η=f (i (t)) (2)
4) battery charging power in the unit time is calculated are as follows:
Wc(t)=u (t) i (t) Δ t (3)
It is mapped to discharge side are as follows:
Wd(t)=f (i (t)) u (t) i (t) Δ t (4)
Integrate to be mapped in a period of time the energy of discharge side in battery charging process are as follows:
It can be calculated the static SOCs of battery at this time are as follows:
(2) it is discharged using different loads battery, obtains letter of the different loads releasable energy with respect to reference load
Number relationship, and then obtain the dynamic SOC of batteryd；
1) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium
Battery keeps rotation hot stand-by duty；
2) stand 10 minutes, then respectively under different loads with the total 5-8 discharge current of 0.1-1C (0.6kW,
1.2kW, 1.8kW, 2.4kW, 3.0kW) it discharges, stop electric discharge when until reaching electric discharge cut-off condition, obtains different loads
Discharge energy WdR；Discharge energy under different loads is subjected to data fitting, obtains battery discharging energy under different loads
Function expression f (R)；
A) dump energy of battery at the end of obtaining battery to load R electric discharge can be calculated by formula (7):
WR=Wdn-f(R) (7)
According to battery static state SOCsCalculate the energy for obtaining the storage of battery current time:
Wr=Wdn·SOCs (8)
It is then possible to the energy released when obtaining battery the present situation using a certain load R discharging time:
Δ W=Wr-WR (9)
Battery can be obtained at this time to load dynamic SOC when R electric dischargedAre as follows:
It is the all-vanadium flow battery SOC estimation method suitable for direct-current grid the invention has the advantages that: the present invention, it will be electric
Pond work is divided into charging process and discharge process, and the energy content of battery is divided into charged side energy and discharge side energy accordingly.Pass through
Charged side energy is mapped as discharge side energy by the efficiency for charge-discharge of battery under different electric currents, obtains battery static state SOCs；With base
Quasi- load discharge capacity is as reference energy, according to static SOCsWith under different loads battery discharge capacity estimation battery
Dynamic SOC under this loadd。
Detailed description of the invention:
Fig. 1 all-vanadium flow battery test platform；
Fig. 2 static state SOCsEstimation result；
Fig. 3 dynamic SOCdEstimation result.
Specific embodiment:
All-vanadium flow battery test platform is as shown in Fig. 1, and battery, which is used, to be cooperated to grind with Shenli Science and Technology Co Ltd, Shanghai
The 3kW/3kWh all-vanadium flow battery of hair, voltage power supply range are 39-52V, discharge cut-off voltage 39V.Upper computer detection
The real-time acquisition of voltage and current may be implemented with data collection system, acquisition precision is respectively 0.1V and 0.1A.DC/DC transformation
Device uses Shanghai Wen Kai power-supply device Co., Ltd WYJ-3000W48V converter, output voltage 0-48V.Load is 48V lamp plate,
60 light bulbs for being 48V/60W including specification, by switching directly in parallel constitute.
1, it is charged the battery respectively using different electric currents, obtains the efficiency of battery under different electric currents, and then obtain electricity
Pond static state SOCs.
1) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium
Battery keeps rotation hot stand-by duty；10 minutes are stood, is then discharged with reference load 0.6kW, is cut until reaching electric discharge
Only stop electric discharge when condition, obtains battery charge reference energy WcnWith electric discharge reference energy Wdn。
2) 10 minutes are stood, is then charged respectively with different electric currents (30A, 40A, 50A, 60A, 70A, 80A), when
Voltage reaches upper limit current and starts reduced moment stopping charging, obtains the rechargeable energy W under battery difference electric currentc；Stand 10
Minute, it is then discharged with 0.6kW, until reaching electric discharge cut-off condition stops electric discharge, is obtained under the different electric currents of battery
Discharge energy Wd。
3) efficiency of battery under battery difference electric current can be acquired with formula (1):
By battery efficiency η (i) fitting under different electric currents, the function of battery efficiency under different electric currents is obtained:
η=f (i (t)) (2)
4) battery charging power in the unit time is calculated are as follows:
Wc(t)=u (t) i (t) Δ t (3)
It is mapped to discharge side are as follows:
Wd(t)=f (i (t)) u (t) i (t) Δ t (4)
Integral can obtain the energy for being mapped to discharge side in a period of time in battery charging process are as follows:
It can be calculated the static SOCs of battery at this time are as follows:
Fig. 2 is all-vanadium flow battery static state SOCsEstimation result.
2, it is discharged using different loads battery, obtains function of the different loads releasable energy with respect to reference load
Relationship, and then obtain the dynamic SOC of batteryd。
A) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium
Battery keeps rotation hot stand-by duty；
B) 10 minutes are stood, is then carried out respectively with different loads (0.6kW, 1.2kW, 1.8kW, 2.4kW, 3.0kW)
Electric discharge stops electric discharge when until reaching electric discharge cut-off condition, obtains the discharge energy W of different loadsdR；By putting under different loads
Electric flux carries out data fitting, obtains the function expression f (R) of battery discharging energy under different loads；
C) dump energy of battery at the end of obtaining battery to load R electric discharge can be calculated by formula (7):
WR=Wdn-f(R) (7)
According to battery static state SOCsCalculate the energy for obtaining the storage of battery current time:
Wr=Wdn·SOCs (8)
It is then possible to the energy released when obtaining battery the present situation using a certain load R discharging time:
Δ W=Wr-WR (9)
Battery can be obtained at this time to load dynamic SOC when R electric dischargedAre as follows:
Attached drawing 3 is all-vanadium flow battery dynamic SOCdEstimation result.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (1)
1. the vanadium cell dynamic SOC based on charge-discharge energy efficiencydEvaluation method charged it is characterized in that battery work is divided into
The energy content of battery is divided into charged side energy and discharge side energy accordingly by journey and discharge process；Pass through battery under different electric currents
Charged side energy is mapped as discharge side energy by efficiency for charge-discharge, obtains battery static state SOCs；With baseline load discharge capacity work
For benchmark energy, according to static SOCsDynamic SOC of the battery under this load is estimated with the discharge capacity of battery under different loadsd,
Specific steps are as follows:
(1) it is charged the battery respectively using different electric currents, obtains the efficiency of battery under different electric currents, and then it is quiet to obtain battery
State SOCs；
1) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium cell
Keep rotation hot stand-by duty；10 minutes are stood, 1C electric discharge is then carried out with reference load, until when reaching electric discharge cut-off condition
Stop electric discharge, obtains battery charge reference energy WcnWith electric discharge reference energy Wdn；
2) 10 minutes are stood, is then charged respectively with 5-8 within the scope of 0.1-1C different charging currents, when voltage reaches
The upper limit, electric current start reduced moment stopping charging, obtain the rechargeable energy W under battery difference electric currentc；10 minutes are stood, so
1C electric discharge is carried out with reference load afterwards, until reaching electric discharge cut-off condition stops electric discharge, obtains putting under the different electric currents of battery
Electric flux Wd；
3) efficiency of battery under different electric currents is acquired with formula (1):
By battery efficiency η (i) fitting under different electric currents, the function of battery efficiency under different electric currents is obtained:
η=f (i (t)) (2)
4) battery charging power in the unit time is calculated are as follows:
Wc(t)=u (t) i (t) Δ t (3)
It is mapped to discharge side are as follows:
Wd(t)=f (i (t)) u (t) i (t) Δ t (4)
Integrate to be mapped in a period of time the energy of discharge side in battery charging process are as follows:
Calculate to obtain the static SOCs of battery at this time are as follows:
(2) it is discharged using different loads battery, the function for obtaining different loads releasable energy with respect to reference load closes
System, and then obtain the dynamic SOC of batteryd；
1) start vanadium cell, charged using constant current constant voltage mode to vanadium cell using charger, until being full of, make vanadium cell
Keep rotation hot stand-by duty；
2) 10 minutes are stood, is then discharged respectively with the discharge current that 5-8 different loads obtain within the scope of 0.1-1C, directly
To electric discharge is stopped when reaching electric discharge cut-off condition, the discharge energy W of different loads is obtaineddR；By the discharge energy under different loads
Data fitting is carried out, the function expression f (R) of battery discharging energy under different loads is obtained；
3) dump energy of battery at the end of obtaining battery to load R electric discharge is calculated by formula (7):
WR=Wdn-f(R) (7)
According to battery static state SOCsCalculate the energy for obtaining the storage of battery current time:
Wr=Wdn·SOCs (8)
Then, the energy released when obtaining battery the present situation using a certain load R discharging time:
Δ W=Wr-WR (9)
Battery is obtained at this time to load dynamic SOC when R electric dischargedAre as follows:
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| CN117368743B (en) * | 2023-12-05 | 2024-03-19 | 深圳市易检车服科技有限公司 | Battery health state evaluation method, device, computer equipment and storage medium |
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| US5656919A (en) * | 1995-11-14 | 1997-08-12 | Cruising Equipment, Inc. | Accurate battery state-of-charge monitoring and indicating apparatus and method |
| CN102121973A (en) * | 2011-01-04 | 2011-07-13 | 武汉理工大学 | Method for testing net energy of electrical vehicle power battery |
| CN102169002A (en) * | 2011-01-04 | 2011-08-31 | 武汉理工大学 | Method for measuring fuel consumption and discharge of hybrid electromobile |
| CN102759713A (en) * | 2011-04-29 | 2012-10-31 | 比亚迪股份有限公司 | Battery energy efficiency testing device and testing method thereof |
| CN103151811A (en) * | 2013-01-28 | 2013-06-12 | 中国科学院金属研究所 | State of charge (SOS) detection method of vanadium battery management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110172939A1 (en) * | 2010-01-08 | 2011-07-14 | Sandip Uprety | System and Method to Determine an Internal Resistance and State of Charge, State of Health, or Energy Level of a Rechargeable Battery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5656919A (en) * | 1995-11-14 | 1997-08-12 | Cruising Equipment, Inc. | Accurate battery state-of-charge monitoring and indicating apparatus and method |
| CN102121973A (en) * | 2011-01-04 | 2011-07-13 | 武汉理工大学 | Method for testing net energy of electrical vehicle power battery |
| CN102169002A (en) * | 2011-01-04 | 2011-08-31 | 武汉理工大学 | Method for measuring fuel consumption and discharge of hybrid electromobile |
| CN102759713A (en) * | 2011-04-29 | 2012-10-31 | 比亚迪股份有限公司 | Battery energy efficiency testing device and testing method thereof |
| CN103151811A (en) * | 2013-01-28 | 2013-06-12 | 中国科学院金属研究所 | State of charge (SOS) detection method of vanadium battery management system |
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Effective date of registration: 20210425 Address after: Nanjing City, Jiangsu province 210000 Holford Lane No. 1 Patentee after: ARMY ENGINEERING University OF PLA Address before: 210007 4 Rong yuan villa, Nanjing, Jiangsu 102 Patentee before: Wang Jinquan Patentee before: JIANGSU ZHENAN XINRUN POWER TECHNOLOGY Co.,Ltd. Patentee before: JIANGSU ZHENAN ELECTRIC POWER EQUIPMENT Co.,Ltd. |