CN104656030B - A kind of method of suitable flow battery SOC-OCV calibration curves - Google Patents
A kind of method of suitable flow battery SOC-OCV calibration curves Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011088 calibration curve Methods 0.000 title claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 43
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims abstract description 8
- 241001269238 Data Species 0.000 claims abstract description 4
- 230000008676 import Effects 0.000 claims abstract description 4
- 238000002474 experimental method Methods 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
The method of suitable flow battery SOC OCV calibration curves, 1) it is according to constant-current constant-voltage charging mode that battery is fully charged, and discharge it, 2) low discharging current is used, select low current with reference to load when working for vanadium cell rotation stand-by heat；3) charged at room temperature using constant current constant voltage mode to vanadium cell, battery is set to be in fully charged state, then above-mentioned low discharging current is used, 4) discharge data for gathering battery management system, import MATLAB processing, and 1/10th energy time points are often put to its ten decile of discharge energy, acquisition；5) battery is full of according still further to constant-current constant-voltage charging mode, charge power supply is disconnected after being full of, kept vanadium cell to be in rotation hot stand-by duty after M minutes, record its open-circuit voltage OCV0；6) discharge data of battery management system collection is subjected to segment processing again, 7) remittance abroad form obtains SOC OCV experimental datas.
Description
Technical field
The present invention relates to charge state of flow battery SOC (state of charge)-open-circuit voltage OCV (open
Circuit voltage) curve calibration, particularly it is a kind of based on engineering practice carry out flow battery SOC-OCV curves mark
Determine method.
Background technology
With global environment drastically deteriorate and the energy is becoming tight day, the micro-capacitance sensor form of renewable energy power generation will be
Played an increasingly important role in Future Power System.However, regenerative resource because its exist intermittence, fluctuation, with
The problems such as machine, power supply quality are low, it is difficult to grid-connected or reliable and stable directly to electrical equipment offer electric energy.For effectively solution can
The problems such as renewable source of energy generation utilization rate is not high, power supply quality is poor, energy-storage battery and renewable energy power generation unit is combined, shape
The isolated power network controllable into supply and demand, can not only realize isolated power grid, can also be grid-connected with power grid progress, realize the two-way of energy
Flowing.
The increase of renewable energy power generation scale is, it is necessary to integrated more capacity and more powerful energy-storage units.And can
Realize that the energy storage device that scale utilizes mainly includes physics energy storage and chemical energy storage.Physics energy-storage units, such as water-storage, pressure
Contracting air energy storage etc. generally requires the geographical conditions and geological environment of harshness, can not often meet in Practical Project.At present, fit
The chemical energy storage of suitable scale mainly includes lead-acid battery, lithium battery, sodium-sulphur battery and vanadium cell etc., preceding three classes battery scale
During change all there are it is more or less the problem of, in particular for more harsh working status, short life and safety otherwise occurs
The problems such as property.Therefore, vanadium cell as can the energy-storage units that utilize of scale because of its environmental-friendly, safe, full Life Cycle
The advantages such as current cost is low, suitably as regenerative resource scale power generation when energy-storage units.
Although the problems such as preferable chemical energy storage need not consider single cell consistency when vanadium cell is as scale energy storage, but still
Need detection in real time and go to instruct vanadium cell charge and discharge control strategy using residual capacity, establish efficient and rational vanadium cell management
System.Wherein, state-of-charge SOC (State of charge) estimated accuracy of vanadium cell establishes vanadium battery management system
Key, the SOC of estimation battery pack is carried out currently for the more open-circuit voltages using external monocell of SOC estimations of vanadium cell, should
Although method can realize the SOC estimations to vanadium cell, since vanadium cell is operationally there are polarizing voltage, using monocell
Open-circuit voltage carry out SOC estimations when need to correct, otherwise error is larger, and the generally use when establishing SOC-OCV curves
Linearly, the error of SOC estimations is further increased.
The method that common energy storage battery carries out SOC estimations at present is more, and be capable of on-line checking has AH methods, neutral net
Method, state observer method and Kalman filtering method etc., in practical applications, when particularly current fluctuation is serious, based on model
Kalman filtering method is used to estimate that effect is preferable during SOC, but this method stills need to demarcate SOC-OCV curves.
Vanadium cell pile is carried out to carry out mixed pulses power to vanadium cell pile when SOC-OCV curves are demarcated
Can test (Hybrid Pulse Power Characterization, HPPC).Constantly increase with the power of vanadium cell pile
Greatly, for demarcating the battery test apparatus cost input highers of SOC-OCV curves, very unsuitable engineering practice, especially in vanadium
Needed during battery use to SOC-OCV curve periodic calibratings.
The content of the invention
A kind of the object of the present invention is to application conditions using vanadium cell system in Practical Project, it is proposed that suitable liquid
The method of galvanic battery SOC-OCV calibration curves.
The technical scheme is that：It is adapted to the method for flow battery (especially vanadium cell) SOC-OCV calibration curves, is
Definition and Nernst equation based on vanadium cell SOC, establish open-circuit voltage OCV (being approximately equal to cell emf) and state-of-charge
Found during the relation of SOC：The SOC-OCV curves of vanadium cell are only related with temperature, unrelated with charge or discharge and its size of current.
Therefore can use normal load and non-critical HPPC is tested and is corrected SOC-OCV curves.Specific implementation method is：
1) it is according to constant-current constant-voltage charging mode that battery is fully charged, and discharge it, heavy-current discharge is used first,
It is higher than rated current, stop electric discharge after a period of time of discharging, recording voltage rises to time N minute tended towards stability, then it is assumed that
In full SOC sections, its polarization time is M=1.5N minutes during band different loads；
2) generally use low discharging current during the experiment of SOC-OCV calibration curves is carried out, it is hot standby with reference to being rotated for vanadium cell
Load during with work selects low current；
3) charged at room temperature using constant current constant voltage mode to vanadium cell, battery is in fully charged state, then use
Above-mentioned low discharging current, with data such as battery management system record discharge voltage, electric current and times；
4) discharge data for gathering battery management system, imports MATLAB processing, and to its discharge energy ten etc.
Point, obtain the time point that battery often puts 1/10th energy；
5) battery is full of according still further to constant-current constant-voltage charging mode, charge power supply is disconnected after being full of, keep vanadium cell to be in
Hot stand-by duty is rotated after M minutes, records its open-circuit voltage OCV0；Then discharge according to identical discharge load, and
4) 1/10th energy time point disconnecting consumers of releasing calculated, keep vanadium cell to be in rotation hot stand-by duty M
After minute, its open-circuit voltage is recorded, and so on, until vanadium cell electric discharge terminates.
6) discharge data again by battery management system collection carries out segment processing, utilizes the Simulink in MATLAB
The module that storehouse is built, calculates the energy k of every section of electric discharge respectivelyi；Then with every section releasing energy divided by total discharge energy, i.e.,
The ratio of every section of releasing energy, then have
7) remittance abroad form obtains SOC-OCV experimental datas；
8) it is fitted using the processing software such as MATLAB, linear and multinomial and other function shapes can be fitted
Formula；
9) experiment that the present invention carries out is to be based on the following formula, therefore when carrying out data fitting, be have selected(wherein k0, k1, k2, k3, k4To treat fitting parameter, no concrete meaning) intended
Close, effect than linear and identical exponent number fitting of a polynomial when it is more preferable, further demonstrate feasibility of the invention.
The beneficial effects of the invention are as follows：System existing equipment can be utilized using this experimental method, it is not necessary to using specialty
Battery test apparatus carries out HPPC tests, reduces the cost that equipment carries out HPPC tests；Method simple practical, especially vanadium electricity
The laggard rower timing of pond scale, existing battery apparatus possibly can not be realized；The present invention is while using existing equipment, only
Rely on MATLAB softwares (can be the software that other can carry out numerical computations) to realize the calculating of energy, but avoid capacity
Or energy record sheet, and it is more preferable using effect during MATLAB softwares, it is more accurate to calculate.
Brief description of the drawings
Fig. 1 is two kinds of vanadium cell system (Fig. 1 a, 1b) main structure application system form；
Fig. 2 is the module made energy calculation based on MATLAB；
Fig. 3 is the schematic diagram of the SOC-OCV calibration curves of the vanadium cell of certain specification.
Embodiment
Elaborate with reference to the accompanying drawings and examples to the present invention.
As shown in Figure 1, two kinds of different main structure forms when being current vanadium cell application, Fig. 1 a are vanadium cell application systems
System, the present embodiment need to establish rational vanadium cell application experiment platform with the main structure of right figure (Fig. 1 b), this platform can be based on
Existing system.Mainly include：For controlling flow battery to be in the external power supply for rotating stand-by heat, AC/DC chargers, commonly bearing
Load (thinking that load fluctuates the characteristic such as big there is no instantaneous power or power swing is slower, such as ohmic load) and vanadium cell
Management system (possesses the related data such as detection and record battery current, voltage, electrolyte temperature).
It is according to constant-current constant-voltage charging mode that battery is fully charged, and discharge it, first using heavy-current discharge, lead to
It is often higher than rated current, stop electric discharge after a period of time of discharging, recording voltage rises to time N minute tended towards stability, can be with
Think that its polarization time is M=1.5N minutes in full SOC sections band different loads.
Generally use low discharging current during the experiment of SOC-OCV calibration curves is carried out, size may be referred to be used for vanadium cell rotation
Turn load selection during stand-by heat work.
Charged at room temperature using constant current constant voltage mode to vanadium cell, battery is in fully charged state, then using upper
State the data such as the low discharging current in 3, record discharge voltage, electric current and time.
The discharge data that battery management system is gathered, imports MATLAB processing, and to its ten decile of discharge energy,
Obtain the time point that battery often puts 1/10th energy；
Battery is full of according still further to constant-current constant-voltage charging mode, charge power supply is disconnected after being full of, keeps vanadium cell to be in rotation
After turning hot stand-by duty M minutes, its open-circuit voltage OCV0 is recorded.Then discharge according to identical discharge load, and in theory
/ 10th energy time point disconnecting consumers of releasing of calculating, keep vanadium cell to be in rotation hot stand-by duty after M minutes, record
Its open-circuit voltage, and so on, until vanadium cell electric discharge terminates.
The discharge data by battery management system collection carries out segment processing again, utilizes the Simulink storehouses in MATLAB
The module built, calculates the energy k of every section of electric discharge respectivelyi；Then it is with every section of energy released divided by total discharge energy, i.e., every
Section releases the ratio of energy, then has
Remittance abroad form obtains SOC-OCV experimental datas；
It is fitted using the processing software such as matlab, linear and multinomial and other functional forms can be fitted；
The following formula is based on during the experiment that the present invention carries out, therefore when carrying out data fitting, have selectedBe fitted, effect than linear and identical exponent number fitting of a polynomial when more
It is good.
Claims (1)
1. being adapted to the method for flow battery SOC-OCV calibration curves, comprise the concrete steps that：
1) it is according to constant-current constant-voltage charging mode that battery is fully charged, and discharge it, first using heavy-current discharge, compare volume
Constant current is high, stops electric discharge after a period of time of discharging, recording voltage rises to time N minute tended towards stability, then it is assumed that complete
Its polarization time is M=1.5N minutes during the band different loads of SOC sections；
2) carry out use low discharging current during the experiment of SOC-OCV calibration curves, during with reference to working for vanadium cell rotation stand-by heat
Load selection low current；
3) charged at room temperature using constant current constant voltage mode to vanadium cell, battery is in fully charged state, then using above-mentioned
Low discharging current, with battery management system record discharge voltage, electric current and time data；
4) discharge data for gathering battery management system, imports MATLAB processing, and to its ten decile of discharge energy, obtains
Battery is taken often to put the time point of 1/10th energy；
5) battery is full of according still further to constant-current constant-voltage charging mode, charge power supply is disconnected after being full of, keep vanadium cell to be in rotation
After hot stand-by duty M minutes, its open-circuit voltage OCV0 is recorded；Then discharge according to identical discharge load, and 4) calculating
1/10th energy time point disconnecting consumers of releasing, keep vanadium cell to be in rotation hot stand-by duty after M minutes, record it and open
Road voltage, and so on, until vanadium cell electric discharge terminates；
6) discharge data again by battery management system collection carries out segment processing, is taken using the Simulink storehouses in MATLAB
The module built, calculates the energy k of every section of electric discharge respectivelyi；Then with every section releasing energy divided by total discharge energy, i.e., every section
The ratio of energy is released, then has SOC0=1,
7) remittance abroad form obtains SOC-OCV experimental datas.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324506A (en) * | 2015-06-17 | 2017-01-11 | 炬才微电子（深圳）有限公司 | Embedded equipment battery test method, device and system |
| CN106707189B (en) * | 2016-12-30 | 2019-08-13 | 中国东方电气集团有限公司 | The detection method and device of flow battery system state-of-charge |
| KR102452626B1 (en) * | 2018-03-07 | 2022-10-06 | 주식회사 엘지에너지솔루션 | Apparatus and method for estimating SOC-OCV profile |
| CN109856542B (en) * | 2018-10-23 | 2021-01-05 | 许继集团有限公司 | Calibration method of lithium battery SOC-OCV curve cluster, SOC correction method and device |
| CN109782191A (en) * | 2019-01-14 | 2019-05-21 | 湖南科霸汽车动力电池有限责任公司 | OCV test method under nickel-metal hydride battery difference carried charge |
| CN111044908B (en) * | 2019-12-24 | 2022-06-14 | 苏州正力新能源科技有限公司 | OCV (open Circuit control) online calculation method based on microchip data and voltage filtering |
| CN114371408B (en) * | 2022-01-26 | 2023-06-20 | 上海玫克生储能科技有限公司 | Method for estimating state of charge of battery, method and device for extracting charging curve |
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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 ELECTRIC POWER EQUIPMENT Co.,Ltd. Patentee before: JIANGSU ZHENAN XINRUN POWER TECHNOLOGY Co.,Ltd. |