CN107221721A - A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference - Google Patents
A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference Download PDFInfo
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- CN107221721A CN107221721A CN201710354620.9A CN201710354620A CN107221721A CN 107221721 A CN107221721 A CN 107221721A CN 201710354620 A CN201710354620 A CN 201710354620A CN 107221721 A CN107221721 A CN 107221721A
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- single battery
- battery
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- voltage
- charge cutoff
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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
- 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
- H01M10/448—End of discharge regulating measures
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- 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
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The invention discloses a kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference, belong to electric vehicle engineering field；It is specific as follows：S1 sets up single battery equivalent-circuit model in parallel；S2 analyzes single battery charge cutoff voltage under different ageing states；Set up N section cells single battery equivalent-circuit model in parallel；Relation curve according to the charge cutoff voltage under different " aged monomer battery " numbers, show that single battery charge cutoff voltage is reduced with the increase of " aged monomer battery " number, and when minimum charge cutoff voltage appears in aged monomer cell number for N 1, i.e., in the case of only including one " normal cell " in " aging single battery "；S3 determines single battery safe charging blanking voltage limiting condition；S4 determines the influence factor of single battery safe charging blanking voltage.The present invention ensures batteries in parallel connection charging safety with the charge cutoff voltage control charging process under limiting condition.
Description
Technical field
The invention belongs to electric vehicle engineering field, and in particular to the side of defining of electrokinetic cell safe charging blanking voltage
Method.
Background technology
Ferric phosphate lithium cell is because of its long-life and high stability, in energy-storage system and electric automobile field by extensive concern.
But power battery pack life-span and safety problem restrict its further application development, battery cutoff voltage and capacity conduct after in groups
The basic parameter of cell safety charge and discharge control, is to avoid battery " crossing discharge charge ", it is ensured that cell safety, improves battery and use the longevity
The basis of life.
In order to reach higher active volume, power battery pack is usually by multiple cells and is unified into single battery.
If difference is not present between cell, single battery capacity can be obtained by cell capacity with cell number product in parallel
Arrive.Inconsistent use environment can cause the difference of rate of ageing between cell, and single battery capacity need to be newly defined as filling
Electric blanking voltage releases capacity to total between discharge cut-off voltage.Aging differences show as the difference of capacity and internal resistance between cell
Different, it is inconsistent that this difference can cause to flow through each cell electric current in single battery, i.e., cell charge-discharge velocity exists poor
It is different, single battery charge cutoff voltage is influenceed, and then influence single battery capacity.In actual application, single battery aging
State is difficult to determine.To ensure that each cell, using safety, need to fill to the single battery under different ageing states in battery pack
Electric blanking voltage changing rule is analyzed, to determine the safe charging blanking voltage limit value for containing " aging single battery ".This
Invention is based on cell safety in utilization, and research considers that the single battery safe charging blanking voltage of cell aging is defined
Method.
The content of the invention
The problem of being difficult to determine for single battery ageing state in actual application, the present invention is with limiting condition
Charge cutoff voltage control charging process ensure batteries in parallel connection charging safety theory, the technical scheme used for：
A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference, including：Different agings
The analysis of single battery charge cutoff voltage and single battery safe charging blanking voltage define the stage under state；
The single battery charge cutoff voltage analysis phase comprises the following steps under the different ageing states：
Step 1, single battery equivalent-circuit model in parallel is set up；The cell single order RC equivalent-circuit models are by retouching
State group of being connected again with ohmic internal resistance R0, battery open circuit voltage Voc after battery dynamic characteristic polarization resistance R1, polarization capacity C1 parallel connection
Into；The parallel connection of cell equivalent-circuit model is constituted into single battery equivalent-circuit model, and divided in each cell model
Not Tian Jia aging factor setting, the setting range of aging factor is 0-1.
Step 2, single battery charge cutoff voltage under different ageing states is analyzed；Set up 20 section cells list in parallel
Economize on electricity pool model, and it is the 80% of initial capacity as 0.8 i.e. capacity to set " aged monomer battery " aging factor, and internal resistance is initial
Charge cutoff voltage under the 166% of internal resistance, different " aged monomer battery " numbers of research；Single battery charge cutoff voltage with
The increase of " aged monomer battery " number and reduce, the minimum charge cutoff voltage in the range of life cycle management be 3.60V, occur
In the case where aged monomer cell number is only to include one " normal cell " in 19, i.e. " aging single battery ".
The single battery safe charging blanking voltage defines the stage and comprised the following steps：
Step 3, single battery safe charging blanking voltage limiting condition is determined；Single battery fills under different ageing states
Electric blanking voltage analytical procedure is understood, when " aged monomer battery " overall internal resistance is maximum, is flowed through with " aged monomer battery " simultaneously
The electric current of " the normal cell " of connection is maximum, and now safe charging blanking voltage is minimum.The internal resistance of " aged monomer battery " entirety
It is that each " aged monomer battery " has the capacity after identical ageing state, i.e. aging identical with internal resistance in the condition of maximum；
Still take that single battery capacity is initial capacity 80% or so includes the list that n saves cell as electrokinetic cell application limit value
The safe charging blanking voltage of batteries will appear in it and include n-1 sections " aged monomer battery ", and each " aged monomer battery " holds
Amount is reduced to initial capacityLimiting condition under.
Step 4, single battery safe charging blanking voltage influence factor is studied；With the increase of charging current, fill safely
Electric blanking voltage is in ascendant trend after first reducing, therefore in actual use, safe charging blanking voltage with curent change shadow
Sound can be ignored, and only consider single battery structure, safe charging is defined with the single battery charge cutoff voltage under limiting condition
Blanking voltage.
Beneficial effects of the present invention：
The present invention proposes the single battery charge cutoff voltage confining method for considering cell aging, is answered for actual
The problem of single battery ageing state is difficult to determine during, charging process is controlled with the charge cutoff voltage under limiting condition
Ensure batteries in parallel connection charging safety.
Brief description of the drawings
Fig. 1 single order RC equivalent-circuit model schematic diagrams.
Fig. 2 cell capacities and internal resistance with period change curve.
Battery charge cutoff voltage under Fig. 3 difference aged monomer cell numbers.
Single battery safe charging blanking voltage under Fig. 4 differences charging current, cell number in parallel.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to this.
A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference, including：Different agings
The analysis of single battery charge cutoff voltage and single battery safe charging blanking voltage define the stage under state；
The single battery charge cutoff voltage analysis phase comprises the following steps under the different ageing states：
Step 1, single battery equivalent-circuit model in parallel is set up；Fig. 1 gives the cell single order RC equivalent electrics
Road model, certainly the invention is not restricted to this battery model, merely just for the ease of elaboration.In figure, Voc is battery open circuit electricity
Pressure, R0 is battery ohmic internal resistance, and R1 and C1 is describe the polarization resistance and electric capacity of battery dynamic characteristic, and V represents battery terminal voltage；
The parallel connection of cell equivalent-circuit model is constituted into single battery equivalent-circuit model, and adds old in each cell model
Change the setting of the factor, aging factor setting range is 0-1.
Step 2, single battery charge cutoff voltage under different ageing states is analyzed；Set up 20 section cells list in parallel
Batteries equivalent-circuit model, sets " aged monomer battery " aging factor as 0.8, is understood with reference to Fig. 2, now " aged monomer
Battery " capacity is the 80% of initial capacity, and internal resistance is the 166% of initial internal resistance.Under Fig. 3 difference " aged monomer battery " numbers
Charge cutoff voltage, as can be seen from the figure single battery charge cutoff voltage is with the increase of " aged monomer battery " number
Minimum charge cutoff voltage in the range of reduction, life cycle management is 3.60V, and it is 19 to appear in aged monomer cell number, i.e., " old
Change single battery " it is interior only comprising in the case of one " normal cell ".
The single battery safe charging blanking voltage defines the stage and comprised the following steps：
Step 3, single battery safe charging blanking voltage limiting condition is determined；Single battery fills under different ageing states
Electric blanking voltage analytical procedure is understood, when " aged monomer battery " overall internal resistance is maximum, flows through " normal monomer connected in parallel
The electric current of battery " is maximum, and now safe charging blanking voltage is minimum.The internal resistance of " aged monomer battery " entirety is in the condition of maximum
Have the capacity after identical ageing state, i.e. aging identical with internal resistance for each difference cell；Still take single battery capacity
80% or so for initial capacity is used as electrokinetic cell application limit value, the safe charging of the single battery comprising n section cells
Blanking voltage will appear in it and include n-1 sections " aged monomer battery ", and each " aged monomer battery " capacity is reduced to initial capacityLimiting condition under.
Step 4, single battery safe charging blanking voltage influence factor is studied；Fig. 4 is shown with limiting condition in step 3
To constrain, the single battery safe charging cut-off under different charging currents, cell number in parallel.As can be seen from the figure with
The increase of charging current, safe charging blanking voltage is in ascendant trend after first reducing, therefore in actual use, and safe charging is cut
Only voltage can be ignored with the influence of curent change, only consider single battery structure, be charged with the single battery under limiting condition
Blanking voltage defines safe charging blanking voltage.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included in the scope of the protection.
Claims (5)
1. a kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference, it is characterised in that including
The analysis of single battery charge cutoff voltage and single battery safe charging blanking voltage define the stage under different ageing states；
The single battery charge cutoff voltage analysis phase comprises the following steps under the different ageing states：
S1：Set up single battery equivalent-circuit model in parallel；Cell single order RC equivalent-circuit models are initially set up, then will be single
The parallel connection of body battery equivalent circuit model constitutes single battery equivalent-circuit model, and divides in each cell equivalent-circuit model
Aging factor is not added；
S2：Analyze single battery charge cutoff voltage under different ageing states；Set up N section cells single battery in parallel etc.
Circuit model is imitated, " aged monomer battery " aging factor is set, the single battery under different " aged monomer battery " numbers is drawn
Charge cutoff voltage relation curve, can draw single battery charge cutoff voltage with " aged monomer battery " number from relation curve
Purpose increases and reduce, and minimum charge cutoff voltage when appearing in aged monomer cell number for N-1, i.e., " aging single-unit is electric
In the case of only one " normal cell " being included in pond "；
The single battery safe charging blanking voltage defines the stage and comprised the following steps：
S3：Determine single battery safe charging blanking voltage limiting condition；The single battery charge cutoff under different ageing states
Voltage analysis step is understood, when " aged monomer battery " overall internal resistance is maximum, flow through it is in parallel with " aged monomer battery " " just
The electric current of normal cell " is maximum, and now safe charging blanking voltage is minimum；The internal resistance of " aged monomer battery " entirety is in maximum
Condition be that each " aged monomer battery " has the capacity after identical ageing state, i.e. aging identical with internal resistance；Still take single-unit
Battery capacity is initial capacity 80% or so as electrokinetic cell application limit value, and the single battery of cell is saved comprising n
Safe charging blanking voltage will appear in it and include n-1 sections " aged monomer battery ", and each " aged monomer battery " capacity is reduced to
Initial capacityLimiting condition under；
S4：Determine the influence factor of single battery safe charging blanking voltage；Set up different charging currents, cell number in parallel
Under single battery safe charging blanking voltage relation curve；The increasing with charging current is drawn according to the relation curve
Greatly, safe charging blanking voltage ignores safe charging blanking voltage in ascendant trend after first reducing, therefore in actual use
With the influence of curent change, only consider single battery structure, peace is defined with the single battery charge cutoff voltage under limiting condition
Full charge cutoff voltage.
2. a kind of single battery safe charging blanking voltage side of defining for considering batteries in parallel connection difference according to claim 1
Method, it is characterised in that the N is set to 20.
3. a kind of single battery safe charging blanking voltage side of defining for considering batteries in parallel connection difference according to claim 1
Method, it is characterised in that the S2 also includes：" aged monomer battery " aging factor is set as 0.8 i.e. " aged monomer battery " to hold
Amount is the 80% of initial capacity, and internal resistance is the 166% of initial internal resistance.
4. a kind of single battery safe charging blanking voltage side of defining for considering batteries in parallel connection difference according to claim 1
Method, it is characterised in that the minimum charge cutoff voltage is 3.60V.
5. a kind of single battery safe charging blanking voltage side of defining for considering batteries in parallel connection difference according to claim 1
Method, it is characterised in that the setting range of the aging factor is 0-1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710354620.9A CN107221721A (en) | 2017-05-19 | 2017-05-19 | A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference |
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| CN201710354620.9A CN107221721A (en) | 2017-05-19 | 2017-05-19 | A kind of single battery safe charging blanking voltage confining method for considering batteries in parallel connection difference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221222A (en) * | 2019-04-30 | 2019-09-10 | 蜂巢能源科技有限公司 | Cell safety blanking voltage prediction technique, device and battery management system |
| CN110690748A (en) * | 2018-06-20 | 2020-01-14 | 浙江万马新能源有限公司 | Wireless charging device for gradient utilization of power battery |
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| CN103632018A (en) * | 2013-12-24 | 2014-03-12 | 山东大学 | Battery modeling method based on Simscape platform |
| CN103935260A (en) * | 2014-05-08 | 2014-07-23 | 山东大学 | Battery managing method based on battery safety protection |
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2017
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103632018A (en) * | 2013-12-24 | 2014-03-12 | 山东大学 | Battery modeling method based on Simscape platform |
| CN103935260A (en) * | 2014-05-08 | 2014-07-23 | 山东大学 | Battery managing method based on battery safety protection |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690748A (en) * | 2018-06-20 | 2020-01-14 | 浙江万马新能源有限公司 | Wireless charging device for gradient utilization of power battery |
| CN110221222A (en) * | 2019-04-30 | 2019-09-10 | 蜂巢能源科技有限公司 | Cell safety blanking voltage prediction technique, device and battery management system |
| CN110221222B (en) * | 2019-04-30 | 2022-03-29 | 蜂巢能源科技有限公司 | Battery safety cut-off voltage prediction method and device and battery management system |
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Application publication date: 20170929 |