CN106684472A - Electricity-supplementing and sorting method and device for reducing dynamic voltage difference among multiple strings of parallel battery packs - Google Patents
Electricity-supplementing and sorting method and device for reducing dynamic voltage difference among multiple strings of parallel battery packs Download PDFInfo
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- CN106684472A CN106684472A CN201611090325.9A CN201611090325A CN106684472A CN 106684472 A CN106684472 A CN 106684472A CN 201611090325 A CN201611090325 A CN 201611090325A CN 106684472 A CN106684472 A CN 106684472A
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- Prior art keywords
- cell
- difference
- voltage
- internal resistance
- capacity
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Classifications
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses an electricity-supplementing and sorting method and device for reducing a dynamic voltage difference among multiple strings of parallel battery packs. According to the technical scheme, multiple single batteries are charged by using constant power P within specific time t1 separately, and then the batteries are ganged according to a capacity difference, an internal resistance difference, a voltage difference and a self-discharge difference among the single batteries. By adopting a constant-power electricity supplementing method, energy states of the single batteries are kept consistent after electricity supplementing is completed, the technical problem that the dynamic voltage difference is large after the batteries are ganged due to the fact that inconsistent charged states or energetic states of the single batteries are easily caused by a constant-current and constant-voltage charging or constant-current charging mode in the prior art is solved, the dynamic voltage difference among the battery packs is effectively reduced, and the durability, the reliability and the security of the power battery packs are improved. The electricity-supplementing and sorting method and device can be widely applied to the field of electricity-supplementing and sorting of various batteries.
Description
Technical field
The present invention relates to battery applications field, more particularly to a kind of benefit electricity method for separating and device of set of cells.
Background technology
With extensive application of the electrokinetic cell in power system of electric automobile, gradually expose a series of such as durable
The problem of the aspects such as property, reliability and safety.Battery in groups after inconsistent between monomer cause this series of problems
One of the main reasons.Because electric automobile type and use condition are limited, to battery power, electric pressure and rated capacity
There is difference in requirement, cell quantity has very big difference in set of cells.Even if parameter request is similar, due to battery types
Difference, required number of batteries there is also larger difference.It is overall that apparently amount of monomer is more, and battery consistency difference is bigger,
Impact to battery performance with it is bigger.
Cell causes the performance difference between cell in manufacture link due to reasons such as material and the accuracies of manufacture
It is absolute existence in battery is applied in groups, the problem can only reduce and cannot thoroughly eliminate, therefore cell is carried out
The concordance of cell initial performance and state is just particularly important when sorting is to improve in groups.
In prior art, cell is carried out sorting generally by the way of constant-current constant-voltage charging or constant-current charge pair
Battery carries out mending electricity, then according to the capacity difference between each battery, poor internal resistance, voltage difference and self discharge difference come combo.But should
Method is easily caused the charging state of cell or lotus energy state is inconsistent so that in groups rear dynamic differential pressure is big for battery, affects electricity
Pond group is normally used.
The content of the invention
In order to solve above-mentioned technical problem, it is an object of the invention to provide one kind is effectively reduced multi-series and parallel connection lithium-ion electric
The benefit electricity method for separating of pond group dynamic differential pressure and device.
The technical solution adopted in the present invention is：
Basic idea of the present invention is：
Mended electrically using invariable power, its principle is to keep the product of charging voltage and charging current constant in benefit electric process.Mend
After electricity terminates, the energy state of cell is consistent, then according to the capacity difference between each battery, internal resistance be poor, voltage difference with
And self discharge difference carrys out combo, in groups rear dynamic differential pressure significantly declines.
In order to implement above-mentioned design, the present invention devises first a kind of benefit electricity of reduction multi-series and parallel connection set of cells dynamic differential pressure
Method for separating, including step：Multiple cells are charged respectively by S1 using firm power P in a special time t1；
S2, according to the capacity difference between each cell, poor internal resistance, voltage difference and self discharge difference come combo.
Preferably, the firm power P=n*C1*V1, wherein, n is the constant more than zero, and C1 is battery nominal capacity, V1
For battery nominal voltage.The value of n can not make firm power P exceed the power that battery can allow to charge.
Preferably, step S2 specifically includes sub-step：S21, the cell after step S1 is charged is warm first
Shelve under degree 12 to 24 hours, record first voltage OCV1 of the cell, the first internal resistance R1；S22, after step S1 is charged
Cell shelve at the first temperature 24 to 108 hours, record second voltage OCV2 of the cell, the second internal resistance
R2；S23, the capacity measured according to each cell determines the capacity difference between each cell；Measured according to each cell
First internal resistance R1 determines that the internal resistance between each cell is poor；First voltage OCV1 measured according to each cell determines each monomer
Voltage difference between battery；First voltage OCV1 that measured according to cell, second voltage OCV2 and the time tested twice
Difference determines that cell capacity determines the self discharge parameter of the cell, further according to the self discharge parameter determination of each cell
Self discharge between each cell is poor；S24, the capacity difference, poor internal resistance, voltage difference and self discharge difference such as between each cell is full
The first constraints of foot, distributes at same group.
Preferably, first constraints includes：Capacity difference<100 MAHs, voltage difference<10 millivolts, internal resistance is poor<1 milli
Europe, self discharge<0.01 millivolt/hour.
Preferably, the battery is ferric phosphate lithium cell.Obviously can also be other types of battery.
The present invention have also been devised the benefit that a kind of reduction multi-series and parallel joins set of cells dynamic differential pressure to implement above-mentioned basic conception
Electric sorting unit, including：Firm power mends electric module, for specific one to multiple cells respectively using firm power P
It is charged in time t1；Combo module, for putting according to the capacity difference between each cell, poor internal resistance, voltage difference and certainly
Electricity difference carrys out combo.
Preferably, the firm power P=n*C1*V1, wherein, n is the constant more than zero, and C1 is battery nominal capacity, V1
For battery nominal voltage.The value of n can not make firm power P exceed the power that battery can allow to charge.
Preferably, the combo module is specifically included：First measurement submodule, charges for firm power to be mended into electric module
Cell afterwards is shelved at the first temperature 12 to 24 hours, records first voltage OCV1 of the cell, the first internal resistance
R1；Second measurement submodule, for firm power is mended the cell after electric module charges shelve at the first temperature 24 to
108 hours, record second voltage OCV2 of the cell, the second internal resistance R2；Parameter determination submodule, for according to each list
The capacity that body battery is measured determines the capacity difference between each cell；Determined according to the first internal resistance R1 that each cell is measured each
Internal resistance between cell is poor；First voltage OCV1 measured according to each cell determines the voltage difference between each cell；
First voltage OCV1 that measured according to cell, second voltage OCV2 and the time difference tested twice determine that cell holds
Amount determine the cell self discharge parameter, further according to each cell each cell of self discharge parameter determination between from
Electric discharge is poor；Parameter combo submodule, it is poor for judging the capacity difference between each cell, poor internal resistance, voltage difference and self discharge
Whether meet the first constraints, then distribute in this way at same group.
Preferably, first constraints includes：Capacity difference<100 MAHs, voltage difference<10 millivolts, internal resistance is poor<1 milli
Europe, self discharge<0.01 millivolt/hour.
Preferably, the battery is ferric phosphate lithium cell.Obviously can also be other types of battery.
The invention has the beneficial effects as follows：
The method that the present invention mends electricity by using invariable power so that after benefit electricity terminates, the energy state of cell is consistent,
Either constant-current charge mode is easily caused the charging state or lotus energy state of cell to overcome prior art constant-current constant-voltage charging
It is inconsistent so that battery in groups after the big technical problem of dynamic differential pressure, effectively reduce the dynamic differential pressure of set of cells, improve power
The durability of set of cells, reliability and safety.
The composite can be widely applied to various batteries and mend electric sorting field.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.
Embodiment 1
In the embodiment, by ferric phosphate lithium cell partial volume after, with constant power P=n*C1*V1 (0<N, C1 nominally hold for battery
Amount, V1 is battery nominal voltage) charge a special time t1 (t1>0), 12 ~ 24h, recording voltage OCV1 are shelved with uniform temperature,
Internal resistance R1；24 ~ 108h is shelved with uniform temperature, OCV2, internal resistance R2 is recorded.Put according to capacity difference, voltage difference, internal resistance difference and certainly
Electricity carries out combo to battery.Specifically, the capacity for being measured according to each cell determines the capacity difference between each cell；According to
The first internal resistance R1 that each cell is measured determines that the internal resistance between each cell is poor；According to each cell measure it is first electric
Pressure OCV1 determines the voltage difference between each cell；First voltage OCV1 that measured according to cell, second voltage OCV2 with
And the time difference tested twice determines that cell capacity determines the self discharge parameter of the cell, wherein,
Self discharge parameter=（First voltage OCV1- second voltage OCV2）/ the time difference tested twice
Further according to each cell each cell of self discharge parameter determination between self discharge it is poor；Such as the appearance between each cell
Measure poor poor, internal resistance, voltage difference and self discharge difference and meet the first constraints, distribute at same group.
More specifically, in the present embodiment, by 75150147-10Ah ferric phosphate lithium cell partial volumes after, with constant power P=
0.5*10*3.2=16W charging 30min（Special time t1）, room temperature（First temperature）24h is shelved, first voltage OCV1 is recorded, the
One internal resistance R1；Room temperature（First temperature）96h is shelved, second voltage OCV2, the second internal resistance R2 is recorded.According to capacity difference<100mAh
（MAH）, voltage difference<10mV（Milliampere）, internal resistance is poor<1mΩ（Milliohm）, self discharge is poor<0.01 mV/h（Millivolt/hour）（With
Upper is the first constraints）Carry out combo.
Experiment measures 8S1P（8 cell series connection）Dynamic differential pressure during battery set charge/discharge is 59mV to the maximum.
As a comparison, after by 75150147-10Ah ferric phosphate lithium cell partial volumes, with 0.5C（0.5 times of rated current）Electric current
Constant-current constant-voltage charging records an OCV1 to 3.65V, cut-off current 0.02C, normal temperature shelf 24h, and the first internal resistance R1, room temperature is put
96h is put, second voltage OCV2, the second internal resistance R2 is recorded.According to capacity difference<100mAh, voltage difference<10mV, internal resistance is poor<1 milliohm,
Self discharge is poor<0.01mV/h carries out combo, and the dynamic differential pressure during 8S1P battery set charge/discharges is 528mV to the maximum.
As can be seen here, the inventive method can be greatly reduced the dynamic differential pressure during battery set charge/discharge.
It is more than that the preferable enforcement to the present invention is illustrated, but the invention is not limited to the enforcement
Example, those of ordinary skill in the art can also make a variety of equivalent variations on the premise of without prejudice to spirit of the invention or replace
Change, the deformation or replacement of these equivalents are all contained in the application claim limited range.
Claims (10)
1. it is a kind of to reduce the benefit electricity method for separating that multi-series and parallel joins set of cells dynamic differential pressure, it is characterised in that including step：
Multiple cells are charged respectively by S1 using firm power P in a special time t1；
S2, according to the capacity difference between each cell, poor internal resistance, voltage difference and self discharge difference come combo.
2. a kind of reduction multi-series and parallel according to claim 1 joins the benefit electricity method for separating of set of cells dynamic differential pressure, its feature
It is, the firm power P=n*C1*V1, wherein, n is the constant more than zero, and C1 is battery nominal capacity, and V1 is that battery is nominal
Voltage.
3. a kind of reduction multi-series and parallel according to claim 1 and 2 joins the benefit electricity method for separating of set of cells dynamic differential pressure, and it is special
Levy and be, step S2 specifically includes sub-step：
S21, the cell after step S1 is charged is shelved at the first temperature 12 to 24 hours, records the of the cell
One voltage OCV1, the first internal resistance R1；
S22, the cell after step S1 is charged is shelved at the first temperature 24 to 108 hours, records the cell
Second voltage OCV2, the second internal resistance R2；
S23, the capacity measured according to each cell determines the capacity difference between each cell；Measured according to each cell
First internal resistance R1 determines that the internal resistance between each cell is poor；First voltage OCV1 measured according to each cell determines each monomer
Voltage difference between battery；First voltage OCV1 that measured according to cell, second voltage OCV2 and the time tested twice
Difference determines that cell capacity determines the self discharge parameter of the cell, further according to the self discharge parameter determination of each cell
Self discharge between each cell is poor；
S24, the capacity difference, poor internal resistance, voltage difference and self discharge difference such as between each cell meets the first constraints, distribution
At same group.
4. a kind of reduction multi-series and parallel according to claim 3 joins the benefit electricity method for separating of set of cells dynamic differential pressure, its feature
It is that first constraints includes：Capacity difference<100 MAHs, voltage difference<10 millivolts, internal resistance is poor<1 milliohm, self discharge<
0.01 millivolt/hour.
5. a kind of reduction multi-series and parallel according to claim 1,2 or 4 joins the benefit electricity method for separating of set of cells dynamic differential pressure, its
It is characterised by, the battery is ferric phosphate lithium cell.
6. it is a kind of to reduce the benefit electricity sorting unit that multi-series and parallel joins set of cells dynamic differential pressure, it is characterised in that to include：
Firm power mends electric module, for being carried out in a special time t1 to multiple cells respectively using firm power P
Charge；
Combo module, for according to the capacity difference between each cell, poor internal resistance, voltage difference and self discharge difference come combo.
7. a kind of reduction multi-series and parallel according to claim 6 joins the benefit electricity sorting unit of set of cells dynamic differential pressure, its feature
It is, the firm power P=n*C1*V1, wherein, n is the constant more than zero, and C1 is battery nominal capacity, and V1 is that battery is nominal
Voltage.
8. a kind of reduction multi-series and parallel according to claim 6 or 7 joins the benefit electricity sorting unit of set of cells dynamic differential pressure, and it is special
Levy and be, the combo module is specifically included：
First measurement submodule, for firm power is mended the cell after electric module charges shelve at the first temperature 12 to
24 hours, record first voltage OCV1 of the cell, the first internal resistance R1；
Second measurement submodule, for firm power is mended the cell after electric module charges shelve at the first temperature 24 to
108 hours, record second voltage OCV2 of the cell, the second internal resistance R2；
Parameter determination submodule, the capacity for being measured according to each cell determines the capacity difference between each cell；According to
The first internal resistance R1 that each cell is measured determines that the internal resistance between each cell is poor；According to each cell measure it is first electric
Pressure OCV1 determines the voltage difference between each cell；First voltage OCV1 that measured according to cell, second voltage OCV2 with
And the time difference tested twice determines that cell capacity determines the self discharge parameter of the cell, further according to each cell
The each cell of self discharge parameter determination between self discharge it is poor；
Parameter combo submodule, for whether judging the capacity difference between each cell, poor internal resistance, voltage difference and self discharge difference
Meet the first constraints, then distribute in this way at same group.
9. a kind of reduction multi-series and parallel according to claim 8 joins the benefit electricity sorting unit of set of cells dynamic differential pressure, its feature
It is that first constraints includes：Capacity difference<100 MAHs, voltage difference<10 millivolts, internal resistance is poor<1 milliohm, self discharge<
0.01 millivolt/hour.
10. a kind of reduction multi-series and parallel according to claim 6,7 or 9 joins the benefit electricity sorting unit of set of cells dynamic differential pressure,
Characterized in that, the battery is ferric phosphate lithium cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611090325.9A CN106684472A (en) | 2016-12-01 | 2016-12-01 | Electricity-supplementing and sorting method and device for reducing dynamic voltage difference among multiple strings of parallel battery packs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611090325.9A CN106684472A (en) | 2016-12-01 | 2016-12-01 | Electricity-supplementing and sorting method and device for reducing dynamic voltage difference among multiple strings of parallel battery packs |
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| CN201611090325.9A Pending CN106684472A (en) | 2016-12-01 | 2016-12-01 | Electricity-supplementing and sorting method and device for reducing dynamic voltage difference among multiple strings of parallel battery packs |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658511A (en) * | 2017-09-28 | 2018-02-02 | 上海华普汽车有限公司 | Power lithium battery combination method and dynamic lithium battery method for group matching |
| CN108196195A (en) * | 2017-12-27 | 2018-06-22 | 银隆新能源股份有限公司 | Battery assembly method, device and equipment |
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| CN104084383A (en) * | 2014-06-26 | 2014-10-08 | 浙江兴海能源科技有限公司 | Self-discharge sorting process for lithium iron phosphate batteries |
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| JPS5961785A (en) * | 1982-09-02 | 1984-04-09 | ポラロイド・コ−ポレ−シヨン | Method and device for inspecting and sorting battery of pro-duction lot |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107658511A (en) * | 2017-09-28 | 2018-02-02 | 上海华普汽车有限公司 | Power lithium battery combination method and dynamic lithium battery method for group matching |
| CN107658511B (en) * | 2017-09-28 | 2019-07-26 | 上海华普汽车有限公司 | Power lithium battery combination method and dynamic lithium battery method for group matching |
| CN108196195A (en) * | 2017-12-27 | 2018-06-22 | 银隆新能源股份有限公司 | Battery assembly method, device and equipment |
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