CN107195943A - Flow battery charge/discharge control method and its system, flow battery - Google Patents
Flow battery charge/discharge control method and its system, flow battery Download PDFInfo
- Publication number
- CN107195943A CN107195943A CN201610144532.1A CN201610144532A CN107195943A CN 107195943 A CN107195943 A CN 107195943A CN 201610144532 A CN201610144532 A CN 201610144532A CN 107195943 A CN107195943 A CN 107195943A
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- flow battery
- voltage
- soc
- pile
- threshold value
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04537—Electric variables
- H01M8/04544—Voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04865—Voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a kind of flow battery charge/discharge control method and its system, flow battery, methods described comprises the following steps：Step 1：Detect flow battery SOC；Step 2：Judge whether flow battery SOC is placed between SOC lower limits and the SOC upper limits, be then to perform step 3, otherwise perform step 4；Step 3：Keep flow battery voltage constant；Step 4：When flow battery SOC is more than or equal to the SOC upper limits, adjust flow battery voltage and be less than the first predeterminated voltage, when flow battery SOC is less than or equal to SOC lower limits, adjustment flow battery voltage is between the first predeterminated voltage and the second predeterminated voltage, and second predeterminated voltage is higher than the first predeterminated voltage.Under the conditions of high SOC, side reaction easily occurs for flow battery, and prolonged high SOC charges the problem of causing flow battery capacity attenuation, meanwhile, under the conditions of low SOC, charge volume can be increased by improving the charging voltage upper limit.
Description
Technical field
The invention belongs to flow battery technology field, and in particular to a kind of flow battery charge/discharge control method and
Its system, flow battery.
Background technology
Flow battery has flexible design (power and capacity can independent design), service life length, charge and discharge electrical
Can good, addressing freedom, energy efficiency height, safety and environmental protection, maintenance cost is low and easily realizes scale electric power storage etc.
Plurality of advantages not available for other conventional batteries.During practical application, flow battery can be widely applied to wind
The renewable energy systems such as energy, solar energy enable the electric power continuous-stable of generation as energy-storage system
Output；May also be used for power network carry out peak load shifting, the electric power of low power consumption is stored, with
Exported during electric peak, balancing electric power supply and demand is come with this；Furthermore it is also possible to be used as emergency power system and standby
Power station etc., it is considered to be most one of energy storage technology of Commercial Prospect.At present, multiple countries build in succession
Into kW~MW grades of flow battery demonstration system, the renewable energy power generation such as solar energy, wind energy system is matched in
System plays the effects such as smooth output, tracking plan generating, balanced load and peak load shifting.
There are the following problems when carrying out discharge and recharge for flow battery of the prior art：1st, flow battery is not considered
Influence under latter stage of charging (high SOC) and electric discharge latter stage (low SOC) to battery performance and capacity,
Discharge and recharge is carried out by the way of direct discharge and recharge to cut-off condition；And flow battery is in discharge and recharge latter stage, electricity
Chemical polarization, concentration polarization increase, side reaction increase, and cause the active material of flow battery to be oxidized/reduction,
So that irreversible decay occurs for flow battery capacity, longtime running life-span and the stability of flow battery are influenceed；2、
Flow battery charge/discharge control method is single, causes the charge volume and discharge capacity of flow battery limited, it is impossible to most
Bigization realizes advantage such as energy efficiency and volumetric properties of flow battery etc..
The content of the invention
The present invention is directed to the proposition of problem above, and develops a kind of flow battery charge/discharge control method and its be
System, flow battery.
The technological means of the present invention is as follows：
A kind of flow battery charge/discharge control method, comprises the following steps：
Step 1：Detect flow battery SOC；
Step 2：Judge whether flow battery SOC is placed between SOC lower limits and the SOC upper limits, be, hold
Row step 3, otherwise performs step 4；
Step 3：Keep flow battery voltage constant；
Step 4：When flow battery SOC is more than or equal to the SOC upper limits, adjustment flow battery voltage is less than first
Predeterminated voltage, when flow battery SOC is less than or equal to SOC lower limits, it is pre- that adjustment flow battery voltage is in first
If between voltage and the second predeterminated voltage, second predeterminated voltage is higher than the first predeterminated voltage；
Further, methods described also comprises the following steps after step 4：
Step 5：The voltage of each pile included by flow battery is detected, step 6 is performed；
Step 6：Difference between any two pile voltage and first voltage threshold value are compared, if arbitrarily
Difference between two pile voltages then performs step 7 more than or equal to first voltage threshold value；
Step 7：When flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust liquid
Galvanic battery charging current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery simultaneously
Adjust flow battery discharge current；
Further,
If the difference between any two pile voltage is less than first voltage threshold value or after step 7 is performed,
Then perform step 8；
Step 8：Difference between any two pile voltage and second voltage threshold value are compared, if arbitrarily
Difference between two pile voltages is more than or equal to second voltage threshold value, and then flow battery is shut down, if any two
Difference between pile voltage is less than second voltage threshold value then return to step 6.
A kind of flow battery charge-discharge control system, including：
First monitoring unit, for detecting flow battery SOC；
The first judging unit being connected with the first monitoring unit, for judging whether flow battery SOC is placed in
Between SOC lower limits and the SOC upper limits；When flow battery SOC is placed between SOC lower limits and the SOC upper limits
When, flow battery current voltage keeps constant；
The first control unit being connected with the first judging unit；First control unit is used for when liquid stream electricity
Pond SOC is more than or equal to the SOC upper limits, and adjustment flow battery voltage is less than the first predeterminated voltage, works as flow battery
SOC is less than or equal to SOC lower limits, and adjustment flow battery voltage is in the first predeterminated voltage and the second predeterminated voltage
Between, second predeterminated voltage is higher than the first predeterminated voltage；
In addition, the system also includes：
Second monitoring unit, the voltage for detecting each pile included by flow battery；
The second comparing unit being connected with second monitoring unit；Second comparing unit is used to appoint
Difference between two pile voltages of meaning is compared with first voltage threshold value；
The second control unit being connected with second comparing unit；Second control unit is used in institute
State the second comparing unit and show that the difference between any two pile voltage is more than or equal to the ratio of first voltage threshold value
After result, when flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust liquid
Galvanic battery charging current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery simultaneously
Adjust flow battery discharge current；
In addition, the system also includes the 3rd be connected with second comparing unit and the second control unit
Comparing unit；3rd comparing unit is used between the second comparing unit obtains any two pile voltage
Difference be less than after the comparative result of first voltage threshold value, or reduced in second control unit
The charging voltage upper limit of flow battery and after adjusting flow battery charging current, or reduction flow battery
The charging voltage upper limit and after adjusting flow battery charging current, by the difference between any two pile voltage
It is compared with second voltage threshold value；Second control unit drawn according to the 3rd comparing unit any two
Difference between individual pile voltage is more than or equal to the comparative result of second voltage threshold value, to control flow battery to stop
Machine；Second comparing unit show that the difference between any two pile voltage is less than in the 3rd comparing unit
After the comparative result of second voltage threshold value, continue the difference and first voltage between any two pile voltage
Threshold value is compared.
A kind of flow battery, with the flow battery charge-discharge control system described in any of the above-described.
By adopting the above-described technical solution, the flow battery charge/discharge control method that provides of the present invention and its being
System, flow battery have the following advantages that compared with prior art：
1st, Intelligent Control Strategy is performed according to the state-of-charge of flow battery, the SOC of optimization flow battery makes
With interval so that reaction polarization of the flow battery in discharge and recharge latter stage greatly reduces, and improves flow battery
Performance and life-span；
2nd, by effectively adjusting the SOC operation intervals of flow battery, the side reaction of flow battery is reduced,
Solve flow battery run under high SOC caused by capacity fade problem；
3rd, by way of reducing the charging voltage upper limit and improving discharge voltage lower limit, solve flow battery and exist
The not good situation of discharge and recharge latter stage charge-discharge performance, substantially increases the charging and discharging capabilities and energy of flow battery
Efficiency.
Brief description of the drawings
Fig. 1 is method flow diagram of the step 1 of the present invention to step 4；
Fig. 2 is method flow diagram of the step 5 of the present invention to step 8；
Fig. 3 is the structural representation of system of the present invention.
Embodiment
A kind of flow battery charge/discharge control method as shown in Figure 1, comprises the following steps：
Step 1：Detect flow battery SOC；
Step 2：Judge whether flow battery SOC is placed between SOC lower limits and the SOC upper limits, be, hold
Row step 3, otherwise performs step 4；
Step 3：Keep flow battery voltage constant；
Step 4：When flow battery SOC is more than or equal to the SOC upper limits, adjustment flow battery voltage is less than first
Predeterminated voltage, when flow battery SOC is less than or equal to SOC lower limits, it is pre- that adjustment flow battery voltage is in first
If between voltage and the second predeterminated voltage, second predeterminated voltage is higher than the first predeterminated voltage；
As shown in Fig. 2 further, methods described also comprises the following steps after step 4：
Step 5：The voltage of each pile included by flow battery is detected, step 6 is performed；
Step 6：Difference between any two pile voltage and first voltage threshold value are compared, if arbitrarily
Difference between two pile voltages then performs step 7 more than or equal to first voltage threshold value；
Step 7：When flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust liquid
Galvanic battery charging current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery simultaneously
Adjust flow battery discharge current；
Further,
If the difference between any two pile voltage is less than first voltage threshold value or after step 7 is performed,
Then perform step 8；
Step 8：Difference between any two pile voltage and second voltage threshold value are compared, if arbitrarily
Difference between two pile voltages is more than or equal to second voltage threshold value, and then flow battery is shut down, if any two
Difference between pile voltage is less than second voltage threshold value then return to step 6.
A kind of flow battery charge-discharge control system as shown in Figure 3, including：First monitoring unit, is used for
Detect flow battery SOC；The first judging unit being connected with the first monitoring unit, for judging liquid stream electricity
Whether pond SOC is placed between SOC lower limits and the SOC upper limits；When flow battery SOC is placed in SOC lower limits
When between the SOC upper limits, flow battery current voltage keeps constant；Be connected with the first judging unit
One control unit；First control unit is used for when flow battery SOC is more than or equal to the SOC upper limits, adjustment
Flow battery voltage is less than the first predeterminated voltage, when flow battery SOC is less than or equal to SOC lower limits, adjusts liquid
Galvanic battery voltage is between the first predeterminated voltage and the second predeterminated voltage, and second predeterminated voltage is higher than the
One predeterminated voltage；In addition, the system also includes：Second monitoring unit, for detecting that flow battery is wrapped
The voltage of each pile included；The second comparing unit being connected with second monitoring unit；Second ratio
It is used to the difference between any two pile voltage and first voltage threshold value being compared compared with unit；With it is described
The second control unit that second comparing unit is connected；Second control unit is used to compare described second
Unit show that the difference between any two pile voltage is more than or equal to after the comparative result of first voltage threshold value,
When flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust flow battery charging
Electric current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery and adjusts liquid stream electricity
Tank discharge electric current；In addition, the system also includes being connected with second comparing unit and the second control unit
The 3rd comparing unit connect；3rd comparing unit is used to obtain any two pile in the second comparing unit
Difference between voltage is less than after the comparative result of first voltage threshold value, or in second control unit
After carrying out the charging voltage upper limit of reduction flow battery and adjusting flow battery charging current, or reduction liquid
The charging voltage upper limit of galvanic battery and after adjusting flow battery charging current, by any two pile voltage it
Between difference be compared with second voltage threshold value；Second control unit is drawn according to the 3rd comparing unit
Any two pile voltage between difference be more than or equal to second voltage threshold value comparative result, to control liquid
Galvanic battery is shut down；Second comparing unit is between the 3rd comparing unit draws any two pile voltage
Difference be less than second voltage threshold value comparative result after, continue by the difference between any two pile voltage with
First voltage threshold value is compared.
It is automatically controlled with the flow battery charge and discharge described in any of the above-described present invention also offers a kind of flow battery
System processed.
Preferably, the SOC lower limits are 30%；The SOC upper limits are 80%；Described first default electricity
Press as 1.55V*m, second predeterminated voltage is 1.6V*m, wherein m is the battery included by flow battery
The quantity of monomer；Flow battery of the present invention includes at least one pile；The pile by battery cell or
Multiple battery cells are composed in series.The present invention can be realized configures liquid according to flow battery SOC concrete condition
Galvanic battery upper voltage limit, can avoid flow battery from being under the conditions of high SOC, easily occur side reaction, long
Charging causes the problem of irreversible decay occurs for flow battery capacity under the conditions of the high SOC of time.In addition, pin
To flow battery the problem of charge volume under the conditions of low SOC or limited discharge capacity, in flow battery operating voltage
On the premise of can bearing, the present invention increases charge volume and discharge capacity by changing voltage bound, increases
The electricity quantity storage capacity and energy efficiency of flow battery.Specifically, the charging voltage of reduction flow battery is carried out
During the operation of the discharge voltage lower limit of the upper limit or raising flow battery, the charging voltage upper limit can be reduced every time
Discharge voltage lower limit is improved 0.3V~0.85V by 0.3V~0.85V, during practical application, with 500kW liquid streams
Exemplified by battery, the span of first voltage threshold value here can be 3~10V, and second voltage threshold value takes
Value may range from 5~15V；The charging voltage upper limit and discharge voltage lower limit of the present invention can be according to reality
Pile voltage between difference condition be adjusted, flow battery charging current or flow battery here are put
The adjustment of electric current is specially to reduce flow battery charging current or reduction flow battery discharge current.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention not office
Be limited to this, any one skilled in the art the invention discloses technical scope in, according to this
The technical scheme of invention and its inventive concept are subject to equivalent substitution or change, should all cover the protection in the present invention
Within the scope of.
Claims (7)
1. a kind of flow battery charge/discharge control method, it is characterised in that methods described comprises the following steps：
Step 1：Detect flow battery SOC；
Step 2：Judge whether flow battery SOC is placed between SOC lower limits and the SOC upper limits, be, hold
Row step 3, otherwise performs step 4；
Step 3：Keep flow battery voltage constant；
Step 4：When flow battery SOC is more than or equal to the SOC upper limits, adjustment flow battery voltage is less than first
Predeterminated voltage, when flow battery SOC is less than or equal to SOC lower limits, it is pre- that adjustment flow battery voltage is in first
If between voltage and the second predeterminated voltage, second predeterminated voltage is higher than the first predeterminated voltage.
2. flow battery charge/discharge control method according to claim 1, it is characterised in that methods described
Also comprise the following steps after step 4：
Step 5：The voltage of each pile included by flow battery is detected, step 6 is performed；
Step 6：Difference between any two pile voltage and first voltage threshold value are compared, if arbitrarily
Difference between two pile voltages then performs step 7 more than or equal to first voltage threshold value；
Step 7：When flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust liquid
Galvanic battery charging current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery simultaneously
Adjust flow battery discharge current.
3. flow battery charge/discharge control method according to claim 2, it is characterised in that
If the difference between any two pile voltage is less than first voltage threshold value or after step 7 is performed,
Then perform step 8；
Step 8：Difference between any two pile voltage and second voltage threshold value are compared, if arbitrarily
Difference between two pile voltages is more than or equal to second voltage threshold value, and then flow battery is shut down, if any two
Difference between pile voltage is less than second voltage threshold value then return to step 6.
4. a kind of flow battery charge-discharge control system, it is characterised in that the system includes：
First monitoring unit, for detecting flow battery SOC；
The first judging unit being connected with the first monitoring unit, for judging whether flow battery SOC is placed in
Between SOC lower limits and the SOC upper limits；When flow battery SOC is placed between SOC lower limits and the SOC upper limits
When, flow battery current voltage keeps constant；
The first control unit being connected with the first judging unit；First control unit is used for when liquid stream electricity
Pond SOC is more than or equal to the SOC upper limits, and adjustment flow battery voltage is less than the first predeterminated voltage, works as flow battery
SOC is less than or equal to SOC lower limits, and adjustment flow battery voltage is in the first predeterminated voltage and the second predeterminated voltage
Between, second predeterminated voltage is higher than the first predeterminated voltage.
5. flow battery charge-discharge control system according to claim 4, it is characterised in that the system
Also include：
Second monitoring unit, the voltage for detecting each pile included by flow battery；
The second comparing unit being connected with second monitoring unit；Second comparing unit is used to appoint
Difference between two pile voltages of meaning is compared with first voltage threshold value；
The second control unit being connected with second comparing unit；Second control unit is used in institute
State the second comparing unit and show that the difference between any two pile voltage is more than or equal to the ratio of first voltage threshold value
After result, when flow battery is in charged state, reduces the charging voltage upper limit of flow battery and adjust liquid
Galvanic battery charging current, when flow battery is in discharge condition, improves the discharge voltage lower limit of flow battery simultaneously
Adjust flow battery discharge current.
6. flow battery charge-discharge control system according to claim 5, it is characterised in that the system
Also include the 3rd comparing unit being connected with second comparing unit and the second control unit；Described 3rd
Comparing unit is less than first voltage for the difference obtained in the second comparing unit between any two pile voltage
After the comparative result of threshold value, or in the charging voltage of second control unit progress reduction flow battery
The upper limit and after adjusting flow battery charging current, or reduction flow battery the charging voltage upper limit and adjust
After flow battery charging current, the difference between any two pile voltage and second voltage threshold value are carried out
Compare；Difference between any two pile voltage that second control unit is drawn according to the 3rd comparing unit
Value is more than or equal to the comparative result of second voltage threshold value, to control flow battery to shut down；Described second is relatively more single
Member show that the difference between any two pile voltage is less than the comparison of second voltage threshold value in the 3rd comparing unit
As a result after, the difference between any two pile voltage and first voltage threshold value are compared by continuation.
7. a kind of flow battery, it is characterised in that the flow battery has any one of claim 4 to 6 institute
The flow battery charge-discharge control system stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610144532.1A CN107195943B (en) | 2016-03-14 | 2016-03-14 | Flow battery charging and discharging control method and system and flow battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610144532.1A CN107195943B (en) | 2016-03-14 | 2016-03-14 | Flow battery charging and discharging control method and system and flow battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107195943A true CN107195943A (en) | 2017-09-22 |
| CN107195943B CN107195943B (en) | 2020-05-29 |
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ID=59871229
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| CN201610144532.1A Active CN107195943B (en) | 2016-03-14 | 2016-03-14 | Flow battery charging and discharging control method and system and flow battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01115068A (en) * | 1987-10-29 | 1989-05-08 | Chiyoda Corp | Operation of redox-flow cell |
| CN1572042A (en) * | 2001-11-09 | 2005-01-26 | 丰田自动车株式会社 | Apparatus for judging state of assembled battery |
| CN102414903A (en) * | 2009-04-28 | 2012-04-11 | 丰田自动车株式会社 | Charge holding method for lithium-ion secondary battery, battery system, vehicle, and battery-mounted device |
| CN102738537A (en) * | 2011-04-14 | 2012-10-17 | 通用汽车环球科技运作有限责任公司 | Method and system for heating a vehicle battery |
| CN105083289A (en) * | 2014-05-16 | 2015-11-25 | 丰田自动车株式会社 | Vehicle control apparatus |
-
2016
- 2016-03-14 CN CN201610144532.1A patent/CN107195943B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01115068A (en) * | 1987-10-29 | 1989-05-08 | Chiyoda Corp | Operation of redox-flow cell |
| CN1572042A (en) * | 2001-11-09 | 2005-01-26 | 丰田自动车株式会社 | Apparatus for judging state of assembled battery |
| CN102414903A (en) * | 2009-04-28 | 2012-04-11 | 丰田自动车株式会社 | Charge holding method for lithium-ion secondary battery, battery system, vehicle, and battery-mounted device |
| CN102738537A (en) * | 2011-04-14 | 2012-10-17 | 通用汽车环球科技运作有限责任公司 | Method and system for heating a vehicle battery |
| CN105083289A (en) * | 2014-05-16 | 2015-11-25 | 丰田自动车株式会社 | Vehicle control apparatus |
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| Publication number | Publication date |
|---|---|
| CN107195943B (en) | 2020-05-29 |
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