CN110021984A - A kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically - Google Patents
A kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically Download PDFInfo
- Publication number
- CN110021984A CN110021984A CN201910419955.3A CN201910419955A CN110021984A CN 110021984 A CN110021984 A CN 110021984A CN 201910419955 A CN201910419955 A CN 201910419955A CN 110021984 A CN110021984 A CN 110021984A
- Authority
- CN
- China
- Prior art keywords
- iron phosphate
- storage battery
- lithium iron
- direct
- phosphate storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007667 floating Methods 0.000 title claims abstract description 12
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 229910052493 LiFePO4 Inorganic materials 0.000 claims description 2
- 239000005955 Ferric phosphate Substances 0.000 abstract description 9
- 229940032958 ferric phosphate Drugs 0.000 abstract description 9
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 abstract description 9
- 229910000399 iron(III) phosphate Inorganic materials 0.000 abstract description 9
- 229910052744 lithium Inorganic materials 0.000 abstract description 9
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 208000031639 Chromosome Deletion Diseases 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- 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
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically, provide direct-current supervision device, disconnect switch, contactor, diode, lithium iron phosphate storage battery group and by-pass switch；The BMS system of the lithium iron phosphate storage battery group calculates the SOC of battery pack in real time, and is uploaded to direct-current supervision device, and direct-current supervision device determines whether to charge the battery according to SOC value；When needing to charge to battery pack, direct-current supervision device control contactor closure, lithium iron phosphate storage battery group is directly attempted by bus, and the charger on bus is powered to lithium iron phosphate storage battery group；When not needing to charge to battery pack, direct-current supervision device control contactor is disconnected, and lithium iron phosphate storage battery group is detached from DC bus and is in static condition.The present invention improves system reliability, and ensures that ferric phosphate lithium cell effectively improves the bulk life time of battery pack under the premise of seamless electric discharge, utmostly reduces security risk caused by battery consistency problem.
Description
Technical field
The present invention relates to transforming plant DC power system design field, especially a kind of lithium iron phosphate storage battery discontinuity is floating
Charging method.
Background technique
It is known, battery as the independent backup power source of station direct current system, exchange have a power failure when backup power source be signal,
Control is closed a floodgate, comprehensive automation offer electrical source of power, is the last line of defense for ensureing direct current system reliability.
Ferric phosphate lithium cell is because its is standing the features such as small in size, light-weight, energy ratio is high, safety and environmental protection, maintainability
With in direct current system using more and more extensive.Application of the ferric phosphate lithium cell in DC power system in the prior art is all
It is directly to hang on DC bus, the uninterrupted power supply of power supply is realized when exchanging power loss.
It is some due to ferric phosphate lithium cell group itself in the existing DC power system based on ferric phosphate lithium cell
Characteristic issues (such as: consistency is bad), cause battery pack to generate the unbalanced energy situation of monomer voltage, if charged for a long time
It may result in inside battery partial monosomy and occur overcharging adverse effects even on fire etc..
Summary of the invention
In view of this, being improved the purpose of the present invention is to propose to a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically
System reliability, and ensure that ferric phosphate lithium cell effectively improves the bulk life time of battery pack under the premise of seamless electric discharge,
Utmostly reduce security risk caused by battery consistency problem.
The present invention is realized using following scheme: a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically, including direct current system
The charger that direct-current supervision device and DC bus in system are electrical connected, provides disconnect switch, contactor, diode, ferric phosphate
Lithium storage battery group and by-pass switch；The positive terminals of the disconnect switch are respectively connected to one end of contactor, diode
One end of cathode and by-pass switch, the negative terminals of the disconnect switch are connected to the cathode of lithium iron phosphate storage battery group, institute
State the other end phase of the anode of diode, the other end of contactor, the anode of lithium iron phosphate storage battery group and by-pass switch
Even；The contactor is controlled by the direct-current supervision device, and the by-pass switch is being in an off state under normal conditions, and the open circuit is opened
Pass is connected with DC bus, and the lithium iron phosphate storage battery group is equipped with BMS system, the BMS system and the direct-current supervision device
Communication is connected；
The BMS system calculates the battery parameter including SOC value of lithium iron phosphate storage battery group in real time, and is uploaded to direct current
Monitor, direct-current supervision device are determined whether to according to the battery parameter (further including the parameters such as cell voltage) including SOC value
It charges the battery；When needing to charge to battery pack, direct-current supervision device control contactor closure (can also say the word to BMS and control
Contactor closure processed), lithium iron phosphate storage battery group is directly attempted by bus, is connected to the charger on DC bus to phosphoric acid
The power supply of iron lithium storage battery group is kept in contact device disconnection when not needing to charge to battery pack, and lithium iron phosphate storage battery group is detached from straight
Stream bus is in static condition；
When the charger that is connected on DC bus operates normally, diode is in reverse state and disconnects, when not needing to electricity
When pond group charges, direct-current supervision device control contactor is disconnected, and lithium iron phosphate storage battery group is detached from DC bus and is in static condition,
If direct-current supervision device judges that lithium iron phosphate storage battery group needs charging to be closed D.C. contactor, battery is directly attempted by mother
On line, charger gives DC load and storage battery power supply simultaneously.
When the charger being connected on DC bus is without output, due to reversal connection diode forward conducting, battery can
Without interruption to DC bus powered, to will not influence the reliability of direct current system.
Further, the diode is propped up using the heavy-duty diode of reversal connection to ensure that discharge loop is connected always
Hold electric discharge (nanosecond) free of discontinuities.
Preferably, when needed, control by-pass switch closure switches to direct connection circuit when by-pass switch closure.
Preferably, the BMS system in lithium iron phosphate storage battery group in the present invention is capable of voltage, the electricity of real-time monitoring battery
The parameters such as stream, internal resistance, temperature, SOC adjust the time accounting of discontinuous floating charging, to be most suitable for battery operation.
Preferably, Centralized Monitoring administrative unit of the direct-current supervision device as direct current system, with filling on BMS, DC bus
Motor etc. is communicated, and realizes monitoring and maintenance management to transformer station direct current system.
Particularly, the present invention also configures passive balance protection device (BPD) in lithium iron phosphate storage battery group, passes through battery
Management system (BMS) is moved back to control the throwing of BPD.In the charge state, when monomer battery voltage reaches setting value, starting BPD electricity
Balance protection measure is pressed, prevents certain single batteries from overcharging, reaches battery cell as far as possible and be intended to unanimously；In accident or electric discharge
State, all voltage balancing functions close, prevent from connecing and cause to waste in the resistance consumption electric energy of single battery.During discharge
BMS can detect each monomer voltage, and electric discharge is automatically stopped when reaching discharge cut-off voltage.
Compared with prior art, the invention has the following beneficial effects: the present invention is using discontinuity floating charge strategy than existing skill
Art improves system reliability, and ensures that ferric phosphate lithium cell effectively improves the whole of battery pack under the premise of seamless electric discharge
Body life time utmostly reduces security risk caused by battery consistency problem.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Figure 1, present embodiments providing a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically, including direct current system
The charger that direct-current supervision device and DC bus in system are electrical connected, provides disconnect switch, contactor, diode, ferric phosphate
Lithium storage battery group and by-pass switch；The positive terminals of the disconnect switch are respectively connected to one end of contactor, diode
One end of cathode and by-pass switch, the negative terminals of the disconnect switch are connected to the cathode of lithium iron phosphate storage battery group, institute
State the other end phase of the anode of diode, the other end of contactor, the anode of lithium iron phosphate storage battery group and by-pass switch
Even；The contactor is controlled by the direct-current supervision device, and the by-pass switch is being in an off state under normal conditions, and the open circuit is opened
Pass is connected with DC bus, and the lithium iron phosphate storage battery group is equipped with BMS system, the BMS system and the direct-current supervision device
Communication is connected；
The BMS system calculates the battery parameter including SOC value of lithium iron phosphate storage battery group in real time, and is uploaded to direct current
Monitor, direct-current supervision device are determined whether to according to the battery parameter (further including the parameters such as cell voltage) including SOC value
It charges the battery；When needing to charge to battery pack, direct-current supervision device control contactor closure (can also say the word to BMS and control
Contactor closure processed), lithium iron phosphate storage battery group is directly attempted by bus, and the charger on bus is to lithium iron phosphate storage battery
Group power supply；When not needing to charge to battery pack, direct-current supervision device control contactor is disconnected, and lithium iron phosphate storage battery group is detached from straight
Stream bus is in static condition.
When the charger that is connected on DC bus operates normally, diode is in reverse state and disconnects, when not needing
When charging to battery pack, direct-current supervision device control contactor is disconnected, and lithium iron phosphate storage battery group is detached from DC bus and is in standing
State, if direct-current supervision device judges that lithium iron phosphate storage battery group needs charging to be closed D.C. contactor, battery is directly simultaneously
It connects on bus, charger gives DC load and storage battery power supply simultaneously.
When the charger on DC bus is without output, due to reversal connection diode forward conducting, battery can be free of discontinuities
Ground is to DC bus powered, to will not influence the reliability of direct current system.
In the present embodiment, the diode is using the heavy-duty diode being reversely connected, to ensure that discharge loop is led always
It is logical, support electric discharge (nanosecond) free of discontinuities.
Preferably, in the present embodiment, when needed, control by-pass switch closure is switched to when by-pass switch closure
Direct connection circuit.
Preferably, the BMS system in the lithium iron phosphate storage battery group of the present embodiment is capable of voltage, the electricity of real-time monitoring battery
The parameters such as stream, internal resistance, temperature, SOC adjust the time accounting of discontinuous floating charging, to be most suitable for battery operation.
Preferably, Centralized Monitoring administrative unit of the direct-current supervision device as direct current system, with filling on BMS, DC bus
Motor etc. is communicated, and realizes monitoring and maintenance management to transformer station direct current system.
Particularly, the present embodiment also configures passive balance protection device (BPD) in lithium iron phosphate storage battery group, passes through electricity
Pond management system (BMS) is moved back to control the throwing of BPD.In the charge state, when monomer battery voltage reaches setting value, start BPD
Electric voltage equalization safeguard measure, prevents certain single batteries from overcharging, and reaches battery cell as far as possible and is intended to unanimously；In accident or put
Electricity condition, all voltage balancing functions close, prevent from connecing and cause to waste in the resistance consumption electric energy of single battery.In discharge process
Middle BMS can detect each monomer voltage, and electric discharge is automatically stopped when reaching discharge cut-off voltage.
The present embodiment uses the charge and discharge control strategy suitable for substation's lithium iron phosphate direct current system, in combination with battery
The passive balance protection measure of system, reduces the difference of single battery end voltage to greatest extent, gives full play to LiFePO4
The effectiveness of battery extends the service life of battery, ensure that the security reliability of substation's lithium iron phosphate direct current system operation.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (2)
1. a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically, including the direct-current supervision device, female with direct current in direct current system
The charger that line is electrical connected, it is characterised in that: provide disconnect switch, contactor, diode, lithium iron phosphate storage battery group, with
And by-pass switch；The positive terminals of the disconnect switch are respectively connected to one end of contactor, the cathode of diode and bypass
One end of switch, the negative terminals of the disconnect switch are connected to the cathode of lithium iron phosphate storage battery group, the sun of the diode
Pole, the other end of contactor, the anode of lithium iron phosphate storage battery group and by-pass switch the other end be connected；The contactor
It is controlled by the direct-current supervision device, the by-pass switch is being in an off state under normal conditions, the disconnect switch and DC bus
It is connected, the lithium iron phosphate storage battery group is equipped with BMS system, which is connected with direct-current supervision device communication；
The BMS system calculates the battery parameter including SOC value of lithium iron phosphate storage battery group in real time, and is uploaded to direct current
Monitor, direct-current supervision device determine whether to charge to battery pack according to the battery parameter including SOC value；When needs are to electricity
When pond group charges, direct-current supervision device control contactor closure, lithium iron phosphate storage battery group is directly attempted by bus, and charger is given
The power supply of lithium iron phosphate storage battery group；When not needing to charge to battery pack, direct-current supervision device control contactor is disconnected, LiFePO4
Battery group is detached from DC bus and is in static condition.
2. a kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically according to claim 1, it is characterised in that: described two
Pole pipe uses heavy-duty diode, to ensure that discharge loop is connected always.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910419955.3A CN110021984A (en) | 2019-05-20 | 2019-05-20 | A kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910419955.3A CN110021984A (en) | 2019-05-20 | 2019-05-20 | A kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110021984A true CN110021984A (en) | 2019-07-16 |
Family
ID=67194088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910419955.3A Pending CN110021984A (en) | 2019-05-20 | 2019-05-20 | A kind of lithium iron phosphate storage battery discontinuity floating charge method for electrically |
Country Status (1)
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|---|---|---|---|---|
| WO2012068774A1 (en) * | 2010-11-24 | 2012-05-31 | 四川电力试验研究院 | Lithium iron battery-based direct current power supply emergency response system for transformer substation |
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-
2019
- 2019-05-20 CN CN201910419955.3A patent/CN110021984A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012068774A1 (en) * | 2010-11-24 | 2012-05-31 | 四川电力试验研究院 | Lithium iron battery-based direct current power supply emergency response system for transformer substation |
| CN202721494U (en) * | 2012-06-06 | 2013-02-06 | 国网电力科学研究院武汉南瑞有限责任公司 | Transformer station direct current power supply system |
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| US20160190829A1 (en) * | 2014-12-25 | 2016-06-30 | Ningde Contemporary Amperex Technology Limited | Passive equalization method and system for lithium iron phosphate battery pack |
| CN204990922U (en) * | 2015-07-07 | 2016-01-20 | 深圳市风向标科技有限公司 | Pure electric vehicles BMS battery management system test bench |
| WO2017012173A1 (en) * | 2015-07-21 | 2017-01-26 | 深圳市佰特瑞储能系统有限公司 | Acquisition module, novel lead-acid storage battery, charge-discharge control device, and smart battery |
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