CN109860714A - The capacity stepping folding and unfolding method of lithium ion battery - Google Patents
The capacity stepping folding and unfolding method of lithium ion battery Download PDFInfo
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- CN109860714A CN109860714A CN201811445480.7A CN201811445480A CN109860714A CN 109860714 A CN109860714 A CN 109860714A CN 201811445480 A CN201811445480 A CN 201811445480A CN 109860714 A CN109860714 A CN 109860714A
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- Prior art keywords
- lithium ion
- ion battery
- capacity
- stepping
- voltage
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 422
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 422
- 238000000034 method Methods 0.000 title claims abstract description 63
- 230000008569 process Effects 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000013461 design Methods 0.000 claims description 70
- 230000015572 biosynthetic process Effects 0.000 claims description 39
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 27
- 229910052744 lithium Inorganic materials 0.000 claims description 27
- 238000013480 data collection Methods 0.000 claims description 18
- 230000004913 activation Effects 0.000 claims description 17
- 230000032683 aging Effects 0.000 claims description 14
- 150000002500 ions Chemical class 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000007405 data analysis Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 40
- 238000010923 batch production Methods 0.000 abstract description 3
- 238000012216 screening Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000012517 data analytics Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention is suitable for the production technical field of lithium ion battery, disclose the capacity stepping folding and unfolding method of lithium ion battery, it includes that stepping relation table establishes process and mass into stepping process, stepping relation table establishes process for the capacity information during collecting, analyzing multiple first lithium ion battery chemical conversions, partial volume, establishes C1‑CIt putsStepping relation table；Mass includes chemical conversion step and stepping folding and unfolding step at stepping process.The capacity stepping folding and unfolding method of lithium ion battery provided by the invention, is establishing C1‑CIt putsAfter stepping relation table, in the subsequent batch production of lithium ion battery, only carry out chemical conversion step and stepping folding and unfolding step, the step of eliminating partial volume and recharging, dramatically shorten the production time of lithium ion battery, the production efficiency of lithium ion battery is effectively increased, is manufactured conducive to the mass production of lithium ion battery.
Description
Technical field
The present invention relates to the production technical field of lithium ion battery more particularly to the capacity stepping folding and unfolding sides of lithium ion battery
Method, for be melted into simultaneously stepping folding and unfolding to the lithium ion battery after activation.
Background technique
Capacity is an important attribute of lithium ion battery.The lithium ion battery of same specification, although its design capacity is
It is identical, but each lithium ion battery that actual production goes out, capacity can still have a certain range of otherness, therefore, in lithium
In the production process of ion battery, in order to obtain the capacitance values that lithium ion battery is accurate, qualified, be typically necessary to each lithium from
The capacity of sub- battery carries out screening stepping, folding and unfolding.
In the prior art, the capacity stepping folding and unfolding method of lithium ion battery typically passes through the lithium after the completion of activating
Ion battery is successively melted into, partial volume, recharged, stepping folding and unfolding this four steps realize that wherein stepping folding and unfolding step is main
It is that the capacitance values of lithium ion battery obtained according to partial volume step are operated.However complete chemical conversion, partial volume step, by
It is smaller in the electric current used, therefore the actual production time is longer, seriously reduces the production efficiency of lithium ion battery, be unfavorable for lithium from
The mass production of sub- battery manufactures.
Summary of the invention
The purpose of the present invention is to provide a kind of capacity stepping folding and unfolding methods of lithium ion battery, aim to solve the problem that existing skill
Cause lithium ion battery production efficiency low from chemical conversion to the complex procedures that stepping folding and unfolding is passed through after the activation of art lithium ion battery
The technical issues of.
In order to achieve the above objectives, scheme provided by the invention is: the capacity stepping folding and unfolding method of lithium ion battery, comprising:
Stepping relation table establishes process, collects, analyzes capacity letter during the chemical conversion of multiple first lithium ion batteries, partial volume
Breath, establishes C1-CIt putsStepping relation table, wherein C1-CIt putsMultiple C are recorded in stepping relation table1Range class and multiple CIt putsRange
The one-to-one relationship information of class, C1It is melted into for lithium ion battery to shipment voltage V1When lithium ion battery capacity, CIt putsFor lithium
Ion battery is from full electricity to the discharge capacity discharged completely；
Mass includes the following steps: at stepping process, the mass at stepping process
It is melted into step, the second lithium ion battery after activation is melted into shipment voltage V1, by second lithium-ion electric
Pond is shelved, and shelving the time is t1, record the capacity C of second lithium ion battery1-1, wherein second lithium ion battery
Design parameter is identical as the design parameter of first lithium ion battery, the shipment voltage V of second lithium ion battery1It is less than
The voltage rating V of second lithium ion batteryVolume；
Stepping folding and unfolding step, according to C1-1In the C1-CIt putsLocating C in stepping relation table1Range class determines described
The C of two lithium ion batteriesIt putsRange class, and according to determining CIt putsRange class carries out stepping receipts to second lithium ion battery
It puts.
Optionally, the stepping relation table establishes process and includes:
Data collection step, the data collection step include following work step:
First charging work step, each first lithium ion battery after activation is melted into shipment voltage V1, then will be each described
First lithium ion battery is shelved, and shelving the time is t2, record the capacity C of each first lithium ion battery1-2；
Second charging work step, each first lithium ion battery is fully charged, each first lithium ion battery is shelved,
Shelving the time is t3；
First electric discharge work step, each first lithium ion battery is substantially discharged, by each first lithium-ion electric
Pond is shelved, and shelving the time is t4, record the capacity C of each first lithium ion batteryPut -1；
Data analysis step, to the C of each first lithium ion battery1-2And CPut -1Data analysis is carried out, C is established1-CIt putsPoint
Shelves relation table, wherein the multiple C1Range class is with the C of each first lithium ion battery1-2For according to progress stepping, institute
State multiple CIt putsRange class is with the C of each first lithium ion batteryPut -1For according to progress stepping.
Optionally, the data collection step further includes being set between the electric discharge work step and the data analysis step
Following work step:
Third charging work step, charges to shipment voltage V for each first lithium ion battery1, by each first lithium from
Sub- battery is shelved, and shelving the time is t5；
Each first lithium ion battery is pressed C by the first stepping folding and unfolding work stepPut -1Locating CIt putsRange class carries out stepping
Folding and unfolding.
Optionally, the data collection step is implemented on formation cabinet, specific embodiment are as follows: will be multiple after activation
First lithium ion battery loaded on formation cabinet, then by the formation cabinet to each first lithium ion battery sequentially into
Row the first charging work step, the second charging work step, the electric discharge work step, the third charge work step and first point described
Shelves folding and unfolding work step.
Optionally, the embodiment of the first charging work step are as follows: first with forming current I1To each first lithium ion
Battery carries out constant-current charge, until the voltage of each first lithium ion battery reaches shipment voltage V1, then with shipment voltage V1
Constant-voltage charge is carried out to each first lithium ion battery, until the electric current of each second lithium ion battery is down to 0.01*CIf,
Then each first lithium ion battery is shelved, shelving the time is t2, record the capacity of each first lithium ion battery
C1-2, wherein CIfFor the design capacity of first lithium ion battery, and the design capacity of first lithium ion battery and institute
The design capacity for stating the second lithium ion battery is equal, 0 < I1< 0.3*CIf, t2≥10min；And/or
The embodiment of the second charging work step are as follows: first with electric current I2Constant current is carried out to each first lithium ion battery
Charging, until the voltage of each first lithium ion battery reaches voltage rating VVolume, then with voltage rating VVolumeTo each described
One lithium ion battery carries out constant-voltage charge, until the electric current of each first lithium ion battery is down to 0.01*CIf, by each described
One lithium ion battery is shelved, and shelving the time is t3, wherein CIfFor the design capacity of first lithium ion battery, and described
The design capacity of one lithium ion battery is equal with the design capacity of second lithium ion battery, I2=0.3*CIf, t3≥10min；
And/or
The embodiment of the first electric discharge work step are as follows: with electric current I3Constant current is carried out to each first lithium ion battery to put
Electricity, until the voltage of each first lithium ion battery is down to critical voltage VFace, each first lithium ion battery is shelved, is put
Setting the time is t4, record the capacity C of each first lithium ion batteryPut -1, wherein critical voltage VFaceFor first lithium ion
Critical voltage when battery discharges completely, I3=0.5*CIf, CIfFor the design capacity of first lithium ion battery, and described
The design capacity of one lithium ion battery is equal with the design capacity of second lithium ion battery, t4≥10min；And/or
The embodiment of third charging work step are as follows: first with electric current I4Constant current is carried out to each first lithium ion battery to fill
Electricity, until the voltage of each first lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To each first lithium
Ion battery carries out constant-voltage charge, until the electric current of each first lithium ion battery is down to 0.01*CIf, by each first lithium
Ion battery is shelved, and shelving the time is t5, wherein CIfFor the design capacity of first lithium ion battery, and first lithium
The design capacity of ion battery is equal with the design capacity of second lithium ion battery, I4=0.5*CIf, t5≥10min。
Optionally, the stepping relation table establishes process further include:
Data point reuse step, the data point reuse step includes following work step:
4th charging work step, multiple third lithium ion batteries are melted into shipment voltage V1, by each third lithium ion
Battery is shelved, and shelving the time is t6, record the capacity C of the lithium ion battery1-3, wherein the third lithium ion battery is set
It is identical as the design parameter of first lithium ion battery to count parameter；
Each third lithium ion battery is pressed C by the second stepping folding and unfolding work step1-3In the C1-CVolumeInstitute in stepping relation table
The C at place1Range class determines the C of each third lithium ion battery respectivelyIt putsRange class, and according to determining CIt putsRange shelves
It is secondary that stepping folding and unfolding is carried out to each third lithium ion battery；
Aging work step carries out aging to each third lithium ion battery；
5th charging work step, each third lithium ion battery after aging is fully charged；
Second electric discharge work step, will be filled with electricity each third lithium ion battery discharge, by each third lithium from
Sub- battery is shelved, and shelving the time is t7, record the capacity C of each third lithium ion batteryPut -2；
Work step is adjusted, by the capacity C of each third lithium ion battery1-3、CPut -2With the C locating for it1Range class, CVolumeModel
It encloses class and is compared analysis, and adjust each C based on the analysis results1The value range of range class.
Optionally, the embodiment of the adjustment work step are as follows:
If a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Less than CIt putsModel
It encloses ratio shared by the third lithium ion battery of the lower limit value of class and reaches the first preset value, then by the C1Range class
Lower limit value is turned up；
And if a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Greater than CIt puts
Ratio shared by the third lithium ion battery of the upper limit value of range class reaches the second preset value, then by the C1Range class
Upper limit value turn down.
Optionally, the 4th charging work step and the second stepping folding and unfolding work step are implemented on formation cabinet, embodiment party
Formula are as follows: multiple third lithium ion batteries after activation are loaded on formation cabinet, then by the formation cabinet to each described
Third lithium ion battery sequentially carries out the 4th charging work step and the second stepping folding and unfolding work step；And/or
The embodiment of the 4th charging work step are as follows: first with forming current I1Each third lithium ion battery is carried out
Constant-current charge, until the voltage of each third lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To each described
Third lithium ion battery carries out constant-voltage charge, until the electric current of each third lithium ion battery is down to 0.01*CIf, will be each described
Third lithium ion battery is shelved, and shelving the time is t6, record the capacity C of the lithium ion battery1-3, wherein CIfIt is described first
The design capacity of lithium ion battery, and the design of the design capacity of the third lithium ion battery and first lithium ion battery
Capacity, the design capacity of second lithium ion battery are all equal, 0 < I1< 0.3*CIf, t6≥10min。
Optionally, the chemical conversion step and the stepping folding and unfolding step are implemented on formation cabinet, embodiments thereof are as follows: will live
Multiple second lithium ion batteries after change are loaded on formation cabinet, then by the formation cabinet to each second lithium ion
Battery sequentially carries out the chemical conversion step and the stepping folding and unfolding step.
Optionally, the embodiment of the chemical conversion step are as follows: first with forming current I1To second lithium ion battery into
Row constant-current charge, until the voltage of second lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To described
Two lithium ion batteries carry out constant-voltage charge, until the electric current of second lithium ion battery is down to 0.01*CIf, by second lithium
Ion battery is shelved, and shelving the time is t1, record the capacity C of second lithium ion battery1-1, wherein CIfFor first lithium
The design capacity of ion battery, and the design of the design capacity of first lithium ion battery and second lithium ion battery is held
Measure equal, 0 < I1< 0.3*CIf；And/or
t1≥10min。
The capacity stepping folding and unfolding method of lithium ion battery provided by the invention, is establishing C1-CIt putsAfter stepping relation table, in lithium
In the subsequent batch production of ion battery, it is only necessary to carry out chemical conversion step and stepping folding and unfolding step, eliminate partial volume and recharge
The step of, the production time of lithium ion battery is dramatically shortened, the production efficiency of lithium ion battery is effectively increased, benefit
It is manufactured in the mass production of lithium ion battery.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow diagram of the capacity stepping folding and unfolding method of lithium ion battery provided in an embodiment of the present invention；
Fig. 2 is flow diagram of the mass provided in an embodiment of the present invention at stepping process；
Fig. 3 is the flow diagram that stepping relation table provided in an embodiment of the present invention establishes process；
Fig. 4 is the flow diagram of data collection step provided in an embodiment of the present invention；
Fig. 5 is the flow diagram of data point reuse step provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
It should also be noted that, when an element is referred to as being " fixed " or " disposed " on another element, it can be straight
Connect on the other element or may be simultaneously present centering elements.When an element is known as " connection " another element,
It, which can be, is directly connected to another element or may be simultaneously present centering elements.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model
Within enclosing.
As depicted in figs. 1 and 2, the capacity stepping folding and unfolding method of lithium ion battery provided in an embodiment of the present invention, comprising:
Stepping relation table establishes process S100, collects, analyzes appearance during the chemical conversion of multiple first lithium ion batteries, partial volume
Information is measured, C is established1-CIt putsStepping relation table, wherein C1-CIt putsMultiple C are recorded in stepping relation table1Range class and multiple CIt puts
The one-to-one relationship information of range class, C1It is melted into for lithium ion battery to shipment voltage V1When lithium ion battery capacity, CIt puts
It is lithium ion battery from full electricity to the discharge capacity discharged completely；
Mass includes the following steps: at stepping process S200, the mass at stepping process S200
It is melted into step S210, the second lithium ion battery after activation is melted into shipment voltage V1, by second lithium from
Sub- battery is shelved, and shelving the time is t1, record the capacity C of second lithium ion battery1-1, wherein second lithium-ion electric
The design parameter in pond identical as the design parameter of first lithium ion battery (i.e. the second lithium ion battery and the first lithium-ion electric
Pond is the same specification lithium ion battery produced by same design parameter by same process), second lithium ion battery goes out
Goods voltage V1Less than the voltage rating V of second lithium ion batteryVolume；
Stepping folding and unfolding step S220, according to C1-1In the C1-CIt putsLocating C in stepping relation table1Range class determines institute
State the C of the second lithium ion batteryIt putsRange class, and according to determining CIt putsRange class divides second lithium ion battery
Shelves folding and unfolding.
Specifically, stepping relation table establishes process S100, be mainly melted by collecting, analyzing multiple lithium ion batteries,
Capacity information during partial volume is melted into establish lithium ion battery to shipment voltage V1When lithium ion battery capacity and lithium
Ion battery is from the stepping corresponding relationship between the full electric discharge capacity into complete discharge process, consequently facilitating subsequent measuring
Lithium ion battery is melted into shipment voltage V1When lithium ion battery capacity after can directly to lithium ion battery carry out stepping receipts
It puts.Mass refers to the lithium ion battery of same size at stepping process S200, in C1-CIt putsIt, can after stepping relation table is established
Successively to be carried out not to different groups lithium ion batteries by chemical conversion step S210 and stepping folding and unfolding step S220 the two steps
Disconnected stepping screening, and do not have to repetition stepping relation table and establish process S100.The appearance of lithium ion battery provided in an embodiment of the present invention
Stepping folding and unfolding method is measured, C is being established1-CIt putsAfter stepping relation table, in the subsequent batch production of lithium ion battery, it is only necessary into
Row chemical conversion step S210 and stepping folding and unfolding step S220 dramatically shortens lithium the step of eliminating partial volume and recharge
The production time of ion battery effectively increases the production efficiency of lithium ion battery, conducive to the mass production of lithium ion battery
Manufacture.
Preferably, referring to Fig.1 shown in -4, the stepping relation table establishes process S100 and includes:
Data collection step S110, the data collection step S110 includes following work step:
First charging work step S111, each first lithium ion battery after activation is melted into shipment voltage V1, then will be each
First lithium ion battery is shelved, and shelving the time is t2, record the capacity C of each first lithium ion battery1-2；
Second charging work step S112, each first lithium ion battery is fully charged, by each first lithium ion battery
It shelves, shelving the time is t3；
First electric discharge work step S113, each first lithium ion battery is substantially discharged, by each first lithium from
Sub- battery is shelved, and shelving the time is t4, record the capacity C of each first lithium ion batteryPut -1；
Data analytic set step S120, to the C of each first lithium ion battery1-2And CPut -1Data analysis is carried out, is established
C1-CIt putsStepping relation table, wherein the multiple C1Range class is with the C of each first lithium ion battery1-2Divided for foundation
Shelves, the multiple CIt putsRange class is with the C of each first lithium ion batteryPut -1For according to progress stepping.
The charging work step S111 of chemical conversion step S210 and first is identical to carry out to the secondary lithium ion battery of same specification, different groups
The step of operation.In the present embodiment, point the first charging work step S111 and the second charging work step before the first electric discharge work step S113
Two step of S112 charges, and on the one hand can obtain the first lithium ion battery by the first charging work step S111 and be melted into shipment voltage
V1When capacity C1-2；On the other hand can be fully charged by lithium ion battery by the second charging work step S112, in order to the first electric discharge
Work step S113 records the capacity C of the first lithium ion batteryPut -1。
Preferably, the data collection step S110 further includes being set to the electric discharge work step and the data analytic set step
Following work step between S120:
Third charging work step S114, charges to shipment voltage V for each first lithium ion battery1, by each described first
Lithium ion battery is shelved, and shelving the time is t5；
Each first lithium ion battery is pressed C by the first stepping folding and unfolding work step S115Put -1Locating CIt putsRange class carries out
Stepping folding and unfolding.
The setting of third charging work step S114 and the first stepping folding and unfolding work step S115, so that data collection step S110 both reached
To establishing C1-CIt putsThe purpose of stepping relation table, and enable the first lithium ion battery to charge to shipment voltage V1Charging shape
Stepping folding and unfolding is realized under state, so that the first lithium ion battery case completed after data collection step S110 is directly entered down
One production link, i.e. data collection step S110 are completed in the production process of lithium ion battery, do not need additionally to be arranged only
Vertical process.
Preferably, the embodiment of the first charging work step S111 are as follows: first with forming current I1To each first lithium
Ion battery carries out constant-current charge, until the voltage of each first lithium ion battery reaches shipment voltage V1, then with shipment
Voltage V1Constant-voltage charge is carried out to each first lithium ion battery, until the electric current of each first lithium ion battery is down to
0.01*CIf(herein, only by CIfNumerical value substitute into and calculate, without by CIfUnit substitute into), then by each first lithium from
Sub- battery is shelved, and shelving the time is t2, record the capacity C of each first lithium ion battery1-2, wherein CIfFor first lithium
The design capacity of ion battery, and the design of the design capacity of first lithium ion battery and second lithium ion battery is held
Measure equal, 0 < I1< 0.3*CIf(herein, only by CIfNumerical value substitute into and calculate, without by CIfUnit substitute into), t2≥
10min.First charging work step S111 in, first with low current to the first lithium ion battery constant-current charge to voltage value is set, then
It is charged again with constant pressure to the first lithium ion battery, this charging modes are conducive to guarantee making for the lithium ion battery being finally made
Use the service life.
Preferably, t2=10min.Theoretically, t2It is arranged bigger, the capacity C of the first lithium ion battery measured1-2It is more steady
It is fixed, accurate, but the time is too long, will affect the production efficiency of lithium ion battery.Herein, by t2Be set as 10min, conducive to take into account lithium from
The capacity stability and production efficiency of sub- battery.
Preferably, the embodiment of the second charging work step S112 are as follows: first with electric current I2To each first lithium ion
Battery carries out constant-current charge, until the voltage of each first lithium ion battery reaches voltage rating VVolume, then with voltage rating
VVolumeConstant-voltage charge is carried out to each first lithium ion battery, until the electric current of each first lithium ion battery is down to 0.01*
CIf, each first lithium ion battery is shelved, shelving the time is t3, wherein CIfFor the design of first lithium ion battery
Capacity, and the design capacity of first lithium ion battery is equal with the design capacity of second lithium ion battery, I2=
0.3*CIf, t3≥10min.In second charging work step S112, first with low current to the first lithium ion battery constant-current charge to specified
Voltage VVolume, then charged again with constant pressure to the first lithium ion battery, this charging modes are conducive to the lithium for guaranteeing to be finally made
The service life of ion battery.Charging current I in second charging work step S1122Greater than the charging in the first charging work step S111
Electric current I1, not only can guarantee the service life of lithium ion battery, but also the production efficiency of lithium ion battery can be improved.
Preferably, t3=10min.Theoretically, t3It is arranged bigger, the capacity of the first lithium ion battery measured is more stable,
Accurately, but the time is too long, will affect the production efficiency of lithium ion battery.Herein, by t3It is set as 10min, conducive to lithium ion is taken into account
The capacity stability and production efficiency of battery.
Preferably, the embodiment of the first electric discharge work step S113 are as follows: with electric current I3To each first lithium-ion electric
Pond carries out constant-current discharge, until the voltage of each first lithium ion battery is down to critical voltage VFace, by each first lithium from
Sub- battery is shelved, and shelving the time is t4, record the capacity C of each first lithium ion batteryPut -1, wherein critical voltage VFaceFor institute
State critical voltage when the first lithium ion battery discharges completely, I3=0.5*CIf, t4≥10min.First electric discharge work step S113 is used for
It is discharged completely the first lithium ion battery.When it is some critical value that the first lithium ion battery, which is discharged to voltage, the first lithium
Ion battery no longer discharges, that is, completes the complete electric discharge of the first lithium ion battery.Electric discharge electricity in first electric discharge work step S113
Flow I3Greater than the charging current I in the second charging work step S1122, not only can guarantee the service life of lithium ion battery, but also lithium can be improved
The production efficiency of ion battery.
Preferably, t4=10min.Theoretically, t4It is arranged bigger, the capacity of the first lithium ion battery measured is more stable,
Accurately, but the time is too long, will affect the production efficiency of lithium ion battery.Herein, by t4It is set as 10min, conducive to lithium ion is taken into account
The capacity stability and production efficiency of battery.
Preferably, the embodiment of third charging work step S114 are as follows: first with electric current I4To each first lithium ion battery
Constant-current charge is carried out, until the voltage of each first lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To each
First lithium ion battery carries out constant-voltage charge, until the electric current of each first lithium ion battery is down to 0.01*CIf, will be each
First lithium ion battery is shelved, and shelving the time is t5, wherein CIfFor the design capacity of first lithium ion battery, and
The design capacity of first lithium ion battery is equal with the design capacity of second lithium ion battery, I4=0.5*CIf, t5≥
10min.Third charging work step S114, which is mainly used for charging to the first lithium ion battery, reaches the capacity of the first lithium ion battery
Capacity under shipment state.
Preferably, t5=10min.
Preferably, the data collection step S110 is implemented on formation cabinet, specific embodiment are as follows: after activation
Multiple first lithium ion batteries loaded on formation cabinet, then by the formation cabinet to each first lithium ion battery according to
Sequence carries out the first charging work step S111, the second charging work step S112, the electric discharge work step, third charging work step
S114 and the first stepping folding and unfolding work step S115.In specific production process, data collection can be editted in advance in formation cabinet
The operation program of step S110, in this way, need to only select corresponding program i.e. controllableization in data collection step S110 operation
At the charging of cabinet automatic running first work step S111, the second charging work step S112, the electric discharge work step and third charging
Work step S114.
Preferably, referring to Fig.1 shown in -5, the stepping relation table establishes process S100 further include:
Data point reuse collection step S130, the data point reuse collection step S130 includes following work step:
4th charging work step S131, multiple third lithium ion batteries are melted into shipment voltage V1, by each third lithium
Ion battery is shelved, and shelving the time is t6, record the capacity C of the lithium ion battery1-3, wherein the third lithium ion battery
Design parameter identical as the design parameter of first lithium ion battery (i.e. third lithium ion battery and the first lithium ion battery
It is the same specification lithium ion battery produced by same design parameter by same process)；
Each third lithium ion battery is pressed C by the second stepping folding and unfolding work step S1321-3In the C1-CVolumeStepping relation table
In locating C1Range class determines the C of each third lithium ion battery respectivelyIt putsRange class, and according to determining CIt putsModel
It encloses class and stepping folding and unfolding is carried out to each third lithium ion battery；
Aging work step S133 carries out aging to each third lithium ion battery；
5th charging work step S134, each third lithium ion battery after aging is fully charged；
Second electric discharge work step S135, each third lithium ion battery that will be filled with electricity discharges, by each third
Lithium ion battery is shelved, and shelving the time is t7, record the capacity C of each third lithium ion batteryPut -2；
Work step S136 is adjusted, by the capacity C of each third lithium ion battery1-3、CPut -2With the C locating for it1Range class,
CVolumeRange class is compared analysis, and adjusts each C based on the analysis results1The value range of range class.
The setting of data point reuse collection step S130, is mainly used for C1-CVolumeEach C in stepping relation table1Range class and CIt putsModel
The corresponding relationship for enclosing class is more accurate, to be conducive to prevent from generating during the high-volume stepping folding and unfolding of lithium ion battery
More stepping mistakes.Wherein, the 4th charging work step S131, chemical conversion step S210 and first charging work step S111 be to same specification,
The step of lithium ion battery of difference group time carries out same operation；Second stepping folding and unfolding work step S132 and stepping folding and unfolding step S220
The step of carrying out same operation for the lithium ion battery to same specification, different groups time.Aging work step S133 be used for third lithium from
Sub- battery is placed, so that the voltage of third lithium ion battery is more acurrate, stablizes.
Preferably, the embodiment of the adjustment work step S136 are as follows:
If a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Less than CIt putsModel
It encloses ratio shared by the third lithium ion battery of the lower limit value of class and reaches the first preset value, then by the C1Range class
Lower limit value is turned up；
And if a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Greater than CIt putsRange
Ratio shared by the third lithium ion battery of class upper limit value reaches the second preset value, then by the C1Range class it is upper
Limit value is turned down.
In the present embodiment, each C1Range class and CIt putsRange class all has a range areas.Using aforesaid way
C adjusted1-CVolumeStepping relation table may make each C1Range class and CIt putsThe corresponding relationship of range class is more accurate.
Preferably, the 4th charging work step S131 and the second stepping folding and unfolding work step S132 is implemented on formation cabinet,
Embodiments thereof are as follows: by multiple third lithium ion batteries after activation loaded on formation cabinet, then pass through the formation cabinet
The 4th charging work step S131 and the second stepping folding and unfolding work step S132 is sequentially carried out to each third lithium ion battery.
In specific production process, the operation program of the 4th charging work step S131 can be editted in advance in formation cabinet, in this way, filling the 4th
When electrician walks S131 operation, the i.e. controllable charging of formation cabinet automatic running the 4th work step S131 of corresponding program need to be only selected,
Convenient operation and control.
Preferably, the embodiment of the 4th charging work step S131 are as follows: first with forming current I1To each third lithium
Ion battery carries out constant-current charge, until the voltage of each third lithium ion battery reaches shipment voltage V1, then with shipment
Voltage V1Constant-voltage charge is carried out to each third lithium ion battery, until the electric current of each third lithium ion battery is down to
0.01*CIf, each third lithium ion battery is shelved, shelving the time is t6, record the capacity C of the lithium ion battery1-3,
Wherein, CIfFor the design capacity of the third lithium ion battery, and the design capacity of the third lithium ion battery and described the
The design capacity of two lithium ion batteries, the design capacity of first lithium ion battery are all equal, 0 < I1< 0.3*CIf, t6≥
10min.4th charging work step S131 uses technique identical with the first charging work step S111 to carry out, in order to the second stepping folding and unfolding
The C established in work step S132 availability data analytic set step S1201-CIt putsStepping relation table is to each third lithium ion battery
Stepping folding and unfolding is carried out, in order to which data point reuse collection step S130 can be more preferably to C1-CIt putsStepping relation table is adjusted.
Preferably, t6=10min.Theoretically, t6It is arranged bigger, the capacity C of the third lithium ion battery measured1-3It is more steady
It is fixed, accurate, but the time is too long, will affect the production efficiency of lithium ion battery.Herein, by t6Be set as 10min, conducive to take into account lithium from
The capacity stability and production efficiency of sub- battery.
Preferably, the chemical conversion step S210 and the stepping folding and unfolding step S220 are implemented on formation cabinet, embodiment party
Formula are as follows: multiple second lithium ion batteries after activation are loaded on formation cabinet, then by the formation cabinet to each described
Second lithium ion battery sequentially carries out the chemical conversion step S210 and the stepping folding and unfolding step S220.In specific production process,
The operation program of chemical conversion step S210 can be editted in advance in formation cabinet, in this way, only needing to select when being melted into step S210 operation
Select the i.e. controllable formation cabinet automatic running chemical conversion step S210 of corresponding program, convenient operation and control.
Preferably, the embodiment of the chemical conversion step S210 are as follows: first with forming current I1To second lithium-ion electric
Pond carries out constant-current charge, until the voltage of second lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To institute
It states the second lithium ion battery and carries out constant-voltage charge, until the electric current of second lithium ion battery is down to 0.01*CIf, by described
Two lithium ion batteries are shelved, and shelving the time is t1, record the capacity C of second lithium ion battery1-1, wherein CIfIt is described
The design capacity of one lithium ion battery, and the design capacity of first lithium ion battery and second lithium ion battery are set
It is equal to count capacity, 0 < I1< 0.3*CIf.Be melted into step S210 in, first with low current to the second lithium ion battery constant-current charge extremely
Voltage value is set, is then charged again with constant pressure to the second lithium ion battery, this charging modes are conducive to guarantee to be finally made
Lithium ion battery service life.In addition, chemical conversion step S210 is used and the first charging work step S111, the 4th charging work step
The all identical technique of S131 carries out, and establishes in order to which stepping folding and unfolding step S220 can be established in process S100 using stepping relation table
C1-CIt putsStepping relation table carries out accurately stepping folding and unfolding to each second lithium ion battery.
Preferably, t1≥10min.As a preferred embodiment of the present embodiment, t1=10min.Theoretically, t1Setting
Must be bigger, the capacity of the first lithium ion battery measured is more stable, accurate, but the time is too long, will affect the life of lithium ion battery
Produce efficiency.Herein, by t1It is set as 10min, conducive to the capacity stability and production efficiency for preferably taking into account lithium ion battery.
As a preferred embodiment of the embodiment of the present invention, the capacity stepping folding and unfolding method of lithium ion battery includes as follows
Step:
1) by cabinet on activated first lithium ion battery, the first lithium ion battery is preferably loaded on 1-3 formation cabinet,
Each formation cabinet loads 512 the first lithium ion batteries.Work step is sent with " verifying work step ", verifying work step is specific as follows:
1.1) with forming current I1Constant current is melted into shipment voltage V1, then constant pressure is melted into cut-off current 0.01*CIf, shelve
10min；
1.2) with 0.3*CIfElectric current constant-current charge to full piezoelectric voltage (voltage rating VVolume), then constant-voltage charge is to cut-off current
0.01C shelves 10min；
1.3) with 0.5*CIfElectric current constant-current discharge to blanking voltage (critical voltage VFace), shelve 10min；
1.4) shipment voltage V is charged to singly to fill technique1, shelve 10min；
1.5) being pressed from both sides under screening criteria by measure, i.e., with work step 1.3) capacity of record corresponds to capacity class and screened down
Folder.
2) to verifying work step process data be collected analysis, find work step 1.1) with work step 1.3) data it is corresponding pass
System, establishes C1-CIt putsStepping relation table.
3) by cabinet on activated third lithium ion battery, third lithium ion battery is loaded preferably on 1-3 formation cabinet,
Each formation cabinet loads 512 third lithium ion batteries.Work step is sent with " production work step ", production work step is specific as follows:
3.1) with forming current I1Constant current is melted into shipment voltage V1, then constant pressure is melted into cut-off current 0.01*CIf, shelve
10min；
3.2) according to C1-CIt putsStepping relation table carries out screening lower folder to each third lithium ion battery；
4) by the third lithium ion battery after pressing from both sides under capacity stepping, aging is carried out；
5) whether qualified to the fully charged verifying of the partial volume again capacity of third lithium ion battery progress after aging；
6) capacity check result is analyzed, adjusts C1-CIt putsIt is wrong to reduce the screening of particular gears low capacity for stepping relation table
Accidentally it is distributed with the ratio of high capacity screening mistake, the capacity for improving lithium ion battery.
7) it is produced in batches with producing work step.
It is below the lithium ion battery of 2000mAh with design capacity to preferably illustrate the scheme of the embodiment of the present invention
For be described lithium ion battery capacity stepping folding and unfolding method specific embodiment:
1) one group is activated, the lithium ion battery that design capacity is 2000mAh is loaded on three formation cabinets, Mei Gehua
512 lithium ion batteries are loaded at cabinet.Technological parameter is sent with " verifying work step ", to carry out following work step:
1.1) with the electric current constant-current charge of 400mA to 3960mV, then constant-voltage charge, time 300min, cut-off current is
20mA shelves 10min；
1.2) with the electric current constant-current charge of 600mA to 4200mV, then constant-voltage charge, time 200min, cut-off current is
20mA shelves 10min；
1.3) 10min is shelved to 2750mV with the electric current constant-current discharge of 1000mA；
1.4) with the electric current constant-current charge of 1000mA to 3960mV, then constant-voltage charge, time 200min, cut-off current is
20mA shelves 10min；
1.5) above-mentioned lithium ion battery is subjected to screening stepping folding and unfolding with the capacity 1.3) recorded.
2) data of above-mentioned verifying work step are copied out, using above-mentioned work step 1.1) capacity data as abscissa, work step
1.3) capacity data does capacity corresponding relationship distribution map as ordinate, according to the capacity corresponding relationship distribution map, establishes
To following C1-CIt putsStepping relation table:
3) another group is activated, design capacity be 2000mAh lithium ion battery be loaded on three formation cabinets, each
Formation cabinet loads 512 lithium ion batteries.Technological parameter is sent with " production work step ", to carry out following work step:
3.1) with the electric current constant-current charge of 400mA to 3960mV, then constant-voltage charge, time 300min, cut-off current is
20mA shelves 10min；
3.2) according to above-mentioned C1-CIt putsStepping relation table carries out screening stepping folding and unfolding to each lithium ion battery；
4) it will be placed in burn-in chamber and carry out aging 7 days by the lithium ion battery after 3.2) screening stepping folding and unfolding, aging terminates
Afterwards, voltage internal resistance combo and coding are carried out to lithium ion battery；
5) the non-defective unit lithium ion battery that each class combo is good respectively takes 48 to be placed in constant temperature test room and carries out capacity survey
Examination；
6) volume test result is analyzed.The results show that each capacity gear all has preferable corresponding relationship, it is able to satisfy substantially
Shipment requirement.If the volume test capacity mistake that some class occurs as the result is shown is more, it is adjusted correspondingly, example
Such as: if the Examined of 1360-1420mAh class is shown, low capacity stepping failure lithium ion battery it is more can will under
Limit value 1360mAh is improved to 1370mAh, to reduce the phenomenon that low capacity stepping fails；If the sampling observation of 1360-1420mAh class
The results show that the lithium ion battery accounting for being higher than 2040mAh capacity is larger, then this upper limit value of 1420mAh can be suitably reduced,
So that capacity distribution is more reasonable.
7) it is produced in batches with producing work step.
The capacity stepping folding and unfolding method of lithium ion battery provided in an embodiment of the present invention is the capacity based on a kind of not partial volume
Prediction technique to lithium ion battery carry out stepping folding and unfolding, i.e., lithium ion battery during batch stepping folding and unfolding only chemical conversion regardless of
Hold, efficiently solves the problems, such as that lithium ion battery production forming and capacity dividing overlong time, efficiency are lower.The present invention specifically exempts from partial volume
Scheme is that the battery completed to activation is melted into certain electric current to shipment voltage, according to C1-CIt putsStepping relation table carries out capacity
Stepping folding and unfolding can be effectively reduced the production time, while can obtain relatively accurate capacitance values again.
The capacity stepping folding and unfolding method of lithium ion battery provided in an embodiment of the present invention be preferably applied to first effect homogeneity compared with
Good lithium ion battery, theoretically first effect fluctuates lesser lithium-ion battery system and can carry out exempting from partial volume work in the method
Skill production.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. the capacity stepping folding and unfolding method of lithium ion battery characterized by comprising
Stepping relation table establishes process, collects, analyzes capacity information during the chemical conversion of multiple first lithium ion batteries, partial volume,
Establish C1-CIt putsStepping relation table, wherein C1-CIt putsMultiple C are recorded in stepping relation table1Range class and multiple CIt putsRange class
One-to-one relationship information, C1It is melted into for lithium ion battery to shipment voltage V1When lithium ion battery capacity, CIt putsFor lithium ion
Battery is from full electricity to the discharge capacity discharged completely；
Mass includes the following steps: at stepping process, the mass at stepping process
It is melted into step, the second lithium ion battery after activation is melted into shipment voltage V1, second lithium ion battery is put
It sets, shelving the time is t1, record the capacity C of second lithium ion battery1-1, wherein the design of second lithium ion battery
Parameter is identical as the design parameter of first lithium ion battery, the shipment voltage V of second lithium ion battery1Less than described
The voltage rating V of second lithium ion batteryVolume；
Stepping folding and unfolding step, according to C1-1In the C1-CIt putsLocating C in stepping relation table1Range class determines second lithium
The C of ion batteryIt putsRange class, and according to determining CIt putsRange class carries out stepping folding and unfolding to second lithium ion battery.
2. the capacity stepping folding and unfolding method of lithium ion battery as described in claim 1, which is characterized in that the stepping relation table
Establishing process includes:
Data collection step, the data collection step include following work step:
First charging work step, each first lithium ion battery after activation is melted into shipment voltage V1, then by each first lithium
Ion battery is shelved, and shelving the time is t2, record the capacity C of each first lithium ion battery1-2；
Second charging work step, each first lithium ion battery is fully charged, each first lithium ion battery is shelved, is shelved
Time is t3；
First electric discharge work step, each first lithium ion battery is substantially discharged, each first lithium ion battery is put
It sets, shelving the time is t4, record the capacity C of each first lithium ion batteryPut -1；
Data analysis step, to the C of each first lithium ion battery1-2And CPut -1Data analysis is carried out, C is established1-CIt putsStepping closes
It is table, wherein the multiple C1Range class is with the C of each first lithium ion battery1-2Stepping is carried out for foundation, it is described more
A CIt putsRange class is with the C of each first lithium ion batteryPut -1For according to progress stepping.
3. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 2, which is characterized in that the data collection step
Suddenly further include the following work step between the electric discharge work step and the data analysis step:
Third charging work step, charges to shipment voltage V for each first lithium ion battery1, by each first lithium ion battery
It shelves, shelving the time is t5；
Each first lithium ion battery is pressed C by the first stepping folding and unfolding work stepPut -1Locating CIt putsRange class carries out stepping folding and unfolding.
4. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 3, which is characterized in that the data collection step
Suddenly implement on formation cabinet, specific embodiment are as follows: multiple first lithium ion batteries after activation are loaded on formation cabinet
On, the first charging work step, described second are sequentially then carried out to each first lithium ion battery by the formation cabinet
Charge work step, the electric discharge work step, third charging work step and the first stepping folding and unfolding work step.
5. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 4, which is characterized in that first battery charger
The embodiment of step are as follows: first with forming current I1Constant-current charge is carried out to each first lithium ion battery, until each described the
The voltage of one lithium ion battery reaches shipment voltage V1, then with shipment voltage V1Each first lithium ion battery is carried out permanent
Pressure charging, until the electric current of each second lithium ion battery is down to 0.01*CIf, then each first lithium ion battery is put
It sets, shelving the time is t2, record the capacity C of each first lithium ion battery1-2, wherein CIfFor first lithium ion battery
Design capacity, and the design capacity of first lithium ion battery is equal with the design capacity of second lithium ion battery, 0
< I1< 0.3*CIf, t2≥10min；And/or
The embodiment of the second charging work step are as follows: first with electric current I2Constant-current charge is carried out to each first lithium ion battery,
Until the voltage of each first lithium ion battery reaches voltage rating VVolume, then with voltage rating VVolumeTo each first lithium from
Sub- battery carries out constant-voltage charge, until the electric current of each first lithium ion battery is down to 0.01*CIf, by each first lithium from
Sub- battery is shelved, and shelving the time is t3, wherein CIfFor the design capacity of first lithium ion battery, and first lithium from
The design capacity of sub- battery is equal with the design capacity of second lithium ion battery, I2=0.3*CIf, t3≥10min；And/or
The embodiment of the first electric discharge work step are as follows: with electric current I3Constant-current discharge is carried out to each first lithium ion battery, directly
Voltage to each first lithium ion battery is down to critical voltage VFace, each first lithium ion battery is shelved, when shelving
Between be t4, record the capacity C of each first lithium ion batteryPut -1, wherein critical voltage VFaceFor first lithium ion battery
Critical voltage when discharging completely, I3=0.5*CIf, CIfFor the design capacity of first lithium ion battery, and first lithium
The design capacity of ion battery is equal with the design capacity of second lithium ion battery, t4≥10min；And/or
The embodiment of third charging work step are as follows: first with electric current I4Constant-current charge is carried out to each first lithium ion battery, until
The voltage of each first lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To each first lithium-ion electric
Pond carries out constant-voltage charge, until the electric current of each first lithium ion battery is down to 0.01*CIf, by each first lithium-ion electric
Pond is shelved, and shelving the time is t5, wherein CIfFor the design capacity of first lithium ion battery, and first lithium-ion electric
The design capacity in pond is equal with the design capacity of second lithium ion battery, I4=0.5*CIf, t5≥10min。
6. such as the capacity stepping folding and unfolding method of the described in any item lithium ion batteries of claim 2 to 5, which is characterized in that described
Stepping relation table establishes process further include:
Data point reuse step, the data point reuse step includes following work step:
4th charging work step, multiple third lithium ion batteries are melted into shipment voltage V1, each third lithium ion battery is put
It sets, shelving the time is t6, record the capacity C of the lithium ion battery1-3, wherein the design parameter of the third lithium ion battery
It is identical as the design parameter of first lithium ion battery；
Each third lithium ion battery is pressed C by the second stepping folding and unfolding work step1-3In the C1-CVolumeLocating in stepping relation table
C1Range class determines the C of each third lithium ion battery respectivelyIt putsRange class, and according to determining CIt putsRange class pair
Each third lithium ion battery carries out stepping folding and unfolding；
Aging work step carries out aging to each third lithium ion battery；
5th charging work step, each third lithium ion battery after aging is fully charged；
Second electric discharge work step, each third lithium ion battery that will be filled with electricity discharges, by each third lithium-ion electric
Pond is shelved, and shelving the time is t7, record the capacity C of each third lithium ion batteryPut -2；
Work step is adjusted, by the capacity C of each third lithium ion battery1-3、CPut -2With the C locating for it1Range class, CVolumeRange shelves
It is secondary to be compared analysis, and each C is adjusted based on the analysis results1The value range of range class.
7. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 6, which is characterized in that the adjustment work step
Embodiment are as follows:
If a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Less than CIt putsRange shelves
Ratio shared by the third lithium ion battery of lower limit value of taking second place reaches the first preset value, then by the C1The lower limit of range class
Value is turned up；
And if a C1Range class, CIt putsIn each third lithium ion battery of range class, CPut -2Greater than CIt putsRange
Ratio shared by the third lithium ion battery of the upper limit value of class reaches the second preset value, then by the C1Range class it is upper
Limit value is turned down.
8. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 6, which is characterized in that the 4th battery charger
Step and the second stepping folding and unfolding work step are implemented on formation cabinet, embodiments thereof are as follows: by multiple third lithiums after activation
Then ion battery sequentially carries out the described 4th to each third lithium ion battery by the formation cabinet loaded on formation cabinet
Charge work step and the second stepping folding and unfolding work step；And/or
The embodiment of the 4th charging work step are as follows: first with forming current I1Constant current is carried out to each third lithium ion battery
Charging, until the voltage of each third lithium ion battery reaches shipment voltage V1, then with shipment voltage V1To each third
Lithium ion battery carries out constant-voltage charge, until the electric current of each third lithium ion battery is down to 0.01*CIf, by each third
Lithium ion battery is shelved, and shelving the time is t6, record the capacity C of the lithium ion battery1-3, wherein CIfFor first lithium from
The design capacity of sub- battery, and the design of the design capacity of the third lithium ion battery and first lithium ion battery is held
Amount, the design capacity of second lithium ion battery are all equal, 0 < I1< 0.3*CIf, t6≥10min。
9. such as the capacity stepping folding and unfolding method of lithium ion battery described in any one of claim 1 to 5, which is characterized in that described
Chemical conversion step and the stepping folding and unfolding step are implemented on formation cabinet, embodiments thereof are as follows: by multiple described second after activation
Then lithium ion battery sequentially carries out describedization to each second lithium ion battery by the formation cabinet loaded on formation cabinet
At step and the stepping folding and unfolding step.
10. the capacity stepping folding and unfolding method of lithium ion battery as claimed in claim 9, which is characterized in that the chemical conversion step
Embodiment are as follows: first with forming current I1To second lithium ion battery carry out constant-current charge, until second lithium from
The voltage of sub- battery reaches shipment voltage V1, then with shipment voltage V1Constant-voltage charge is carried out to second lithium ion battery, directly
Electric current to second lithium ion battery is down to 0.01*CIf, second lithium ion battery is shelved, shelving the time is t1,
Record the capacity C of second lithium ion battery1-1, wherein CIfFor the design capacity of first lithium ion battery, and it is described
The design capacity of first lithium ion battery is equal with the design capacity of second lithium ion battery, 0 < I1< 0.3*CIf；And/
Or,
t1≥10min。
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| CN113839109A (en) * | 2021-08-17 | 2021-12-24 | 天能帅福得能源股份有限公司 | Method for rapidly grading capacity of lithium ion battery |
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