CN105161749A - Shaping apparatus and method for lithium ion battery - Google Patents
Shaping apparatus and method for lithium ion battery Download PDFInfo
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- CN105161749A CN105161749A CN201510504221.7A CN201510504221A CN105161749A CN 105161749 A CN105161749 A CN 105161749A CN 201510504221 A CN201510504221 A CN 201510504221A CN 105161749 A CN105161749 A CN 105161749A
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- lithium ion
- ion battery
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- pressure
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a shaping apparatus and method for a lithium ion battery. The apparatus comprises a heat insulation pressure container, a furnace chamber packaged in the heat insulation pressure container and a load chamber configured in the furnace chamber; a storage space for accommodating a to-be-shaped lithium ion battery is formed in the furnace cavity; a temperature sensor and a pressure sensor are further arranged in the storage space; the load chamber is electrically connected with the temperature sensor and the pressure sensor separately, and is communicated with the storage space through pressure medium; the load chamber is used for obtaining detected temperature and detected pressure from the temperature sensor and the pressure sensor respectively; the storage space is pressurized and heated by the pressure medium according to the detected temperature and the detected pressure; an isostatic pressing condition required by the to-be-shaped lithium ion battery can be satisfied in the storage space, and the isostatic pressing condition in the storage space is maintained and kept for a preset time duration so as to realize shaping of the lithium ion battery under the isostatic pressing condition. The technical scheme of the shaping apparatus and the method can ensure more balanced stress, lower damage and low possibility of deformation of the lithium ion battery in the shaping process.
Description
Technical field
The present invention relates to lithium ion battery production technical field, particularly relate to a kind of lithium ion battery apparatus for shaping and method.
Background technology
At present, along with the high speed development of new-energy automobile, lithium ion battery is also increasingly extensive in the application of new-energy automobile, and the production of lithium ion battery more and more comes into one's own.
In lithium ion battery production process, in order to meet the thickness of battery, hardness, the requirement such as surface planarity and outward appearance, keep the pole piece interface formedness in lithium ion battery and prevent the battery core quick aging of inside lithium ion cell, trimming is particularly important.In practical application, in existing lithium ion battery production process, the overwhelming majority requires trimming.Under normal circumstances, for the lithium ion battery of regular shape, the following two kinds shaping process is usually adopted to carry out shaping: heat is colded pressing shaping and fixture baking shaping.Wherein hot shaping of colding pressing all adopts certain fixture usually, is compressed by lithium ion battery, then carries out hot pressing or cold pressing treatment, make lithium ion battery not yielding.For irregular Special-shaped lithium ion battery, in order to meet its shaping requirements, prior art mainly concentrates on a kind of vest matched with it of design, vest is combined be the entirety that one regular with lithium ion battery, then adopt hot pressing or cold pressing treatment to carry out Shape correction to lithium ion battery.Wherein vest adopts metal alloy usually.In order to prevent short circuit, on vest, generally post one deck insulation high-molecular organic material, if Teflon etc. is to ensure to insulate.
Realizing in process of the present invention; inventor finds that prior art at least exists following shortcoming: in prior art; no matter be the shaping of the lithium ion battery of regular shape or the shaping of irregular Special-shaped lithium ion battery; usually clamp pressing can be adopted to lithium ion battery; and carry out hot pressing or cold pressing treatment; lithium ion battery discontinuity equalization is larger to the damage of lithium-ion electric core.Especially irregular Special-shaped lithium ion battery, vest designed in reforming process also the position of abnormity on lithium ion battery surface can extrude pit, and this pit very easily analyses lithium, makes lithium ion battery there is certain potential safety hazard.
Summary of the invention
The invention provides a kind of lithium ion battery apparatus for shaping and method, to adopt clamp pressing in the lithium ion battery reforming process overcoming prior art, and carry out hot pressing or cold pressing treatment, lithium ion battery discontinuity equalization, the problem larger to the damage of lithium-ion electric core, especially irregular Special-shaped lithium ion battery, vest designed in reforming process also the position of abnormity on lithium ion battery surface can extrude pit, this pit very easily analyses lithium, makes lithium ion battery there is the problem of certain potential safety hazard.
The invention provides a kind of lithium ion battery apparatus for shaping, comprise: adiabatic pressure container, the load cell being packaged in the furnace chamber in described adiabatic pressure container and being configured in described furnace chamber, also be provided with the parking space placed and treat the lithium ion battery of shaping in described furnace chamber, in described parking space, be also provided with temperature sensor and pressure sensor, described load cell is electrically connected with described temperature sensor and described pressure sensor respectively, and be communicated with by pressure medium with described parking space, described load cell is used for obtaining detected temperatures and detected pressures from described temperature sensor and described pressure sensor respectively, and according to described detected temperatures and described detected pressures, described pressure medium is adopted to carry out pressurized, heated process to described parking space, described parking space is made to reach isostatic pressed condition described in shaping needed for lithium ion battery, and maintain described parking space and keep predetermined time period under described isostatic pressed condition, to realize under described isostatic pressed condition described lithium ion battery shaping.
The present invention also provides a kind of lithium ion battery shaping methods, and described method is applied in lithium ion battery apparatus for shaping described above, and described method comprises:
To treat that the lithium ion battery of shaping puts into the parking space of the lithium ion battery of furnace chamber;
Described load cell adopts pressure medium to carry out heating pressurized treatments to described parking space, makes described parking space reach isostatic pressed condition described in shaping needed for lithium ion battery;
Described load cell maintains described parking space and keeps described isostatic pressed condition predetermined time period, to realize under described isostatic pressed condition described lithium ion battery shaping.
Lithium ion battery apparatus for shaping of the present invention and method, by adiabatic pressure container, the load cell that is packaged in the furnace chamber in adiabatic pressure container and is configured in furnace chamber, be also provided with the parking space placed and treat the lithium ion battery of shaping in furnace chamber; Temperature sensor and pressure sensor is also provided with in parking space; Load cell is electrically connected with temperature sensor and pressure sensor respectively, and be communicated with by pressure medium with parking space, load cell is used for obtaining detected temperatures and detected pressures from temperature sensor and pressure sensor respectively, and according to detected temperatures and detected pressures, pressure medium is adopted to carry out pressurized, heated process to parking space, parking space is made to reach isostatic pressed condition needed for shaping lithium ion battery, and predetermined time period under maintaining parking space maintenance isostatic pressed condition, to realize under isostatic pressed condition lithium ion battery shaping.Adopting technical scheme of the present invention, when carrying out shaping to lithium ion battery, lithium ion battery can not only be made stressed more balanced, less to the damage of the battery core of lithium ion battery, and not yielding, improve the fail safe of lithium ion battery; Be not only applicable to the lithium ion battery shaping of rule, also can solve the potential safety hazard that the pit that formed in irregular Special-shaped lithium ion battery reforming process causes.Technical scheme of the present invention, shaping process process is simple, easy to operate, is easy to quantize to produce.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of lithium ion battery apparatus for shaping embodiment of the present invention;
Fig. 2 is the flow chart of lithium ion battery shaping methods embodiment of the present invention;
Fig. 3 is comparative examples three lithium ion battery length direction upper and lower surface line sweep schematic diagram of the present invention;
Fig. 4 is example three lithium ion battery length direction upper and lower surface line sweep schematic diagram of the present invention;
Fig. 5 is the lithium ion battery thickness measuring schematic diagrames of each 100 lithium ion batteries of example one of the present invention, comparative examples one and comparative examples two before shaping, after shaping and after capacity;
Fig. 6 is 45 DEG C of loop test schematic diagrames of example three of the present invention and comparative examples three.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of lithium ion battery apparatus for shaping embodiment one of the present invention, as shown in Figure 1, the lithium ion battery apparatus for shaping of the present embodiment can comprise: adiabatic pressure container 1, the load cell 3 being packaged in the furnace chamber 2 in adiabatic pressure container 1 and being configured in furnace chamber 2, is also provided with the parking space 4 placed and treat the lithium ion battery of shaping in furnace chamber 2; Temperature sensor 5 and pressure sensor 6 is also provided with in parking space 4; Load cell 3 is electrically connected with temperature sensor 5 and pressure sensor 6 respectively, be communicated with by pressure medium with parking space 4, load cell 3 is for obtaining detected temperatures and detected pressures from temperature sensor 5 and pressure sensor 6 respectively, and according to detected temperatures and detected pressures, pressure medium is adopted to carry out pressurized, heated process to parking space 4, parking space 4 is made to reach isostatic pressed condition needed for shaping lithium ion battery, and maintain parking space 4 and keep predetermined time period under isostatic pressed condition, to realize under isostatic pressed condition lithium ion battery shaping.
Particularly, can being connected by pipeline between load cell 3 with parking space 4, for being communicated with pressure medium, this passage can being provided with valve (not shown), for opening when needs or valve-off, to control the force value in parking space 2.Parking space 4 is arranged in furnace chamber 2, can be communicated with other spaces in furnace chamber 2 except load cell 3.Because as shown in Figure 1, parking space 4 is adopted and is shown in broken lines, and represents that parking space 4 is communicated with furnace chamber 2.
Load cell 3, according to detected temperatures and detected pressures, adopts pressure medium to carry out pressurized, heated process to parking space 4, makes parking space 4 reach isostatic pressed condition needed for shaping lithium ion battery, specifically can adopt the following two kinds mode:
First kind of way: first pressurize in furnace chamber 2, makes the pressure at parking space 4 place reach 60% ~ 100% of the target, pressure of isostatic pressed condition, and then is warming up to target temperature and pressure; Temperature-rise period particularly, thermocouple can be arranged to heat pressure medium in load cell 3, pressure medium circulates between load cell 3 and furnace chamber 2, thus realize heating furnace chamber 2, and finally according to the temperature value that temperature inductor 5 is responded to, control to be heated in furnace chamber 2 temperature value that isostatic pressed condition needed for shaping lithium ion battery is corresponding.When the pressure inductor 6 in parking space 4 senses that pressure departs from desired value in temperature-rise period, in furnace chamber 2, internal pressure will be adjusted by pressure release or pressurization; The mode of pressurization still increases pressure medium to realize to furnace chamber 2 by load cell 3, and final according to temperature inductor 5 and pressure inductor 6, realize temperature value corresponding to the isostatic pressed condition be pressurized in furnace chamber 2 needed for shaping lithium ion battery and force value.
The second way: first heat in furnace chamber 2, thermocouple can be arranged particularly come to heat pressure medium in load cell 3, pressure medium circulates between load cell 3 and furnace chamber 2, thus realize heating furnace chamber 2, make the temperature at parking space 4 place reach 60% ~ 100% of the target temperature of isostatic pressed condition.And then by increasing pressure medium to pressurize in furnace chamber 2, when in furnace chamber 2, temperature inductor 5 senses temperature departure desired value in boost process, will by lowering the temperature or heating to adjust temperature in furnace chamber 2 in furnace chamber 2, final according to temperature inductor 5 and pressure inductor 6, realize temperature value corresponding to the isostatic pressed condition be pressurized in furnace chamber 2 needed for shaping lithium ion battery and force value.
Above-mentioned load cell 3 is according to detected temperatures and detected pressures, and adopt pressure medium to carry out in pressurized, heated processing procedure to parking space 4, compression rate is 0-50MPa/s, and the pressure limit in furnace chamber is 0.1-800MPa, and temperature range is-30-130 DEG C; When heating, heating rate is 0-100 DEG C/min.Predetermined time period under final maintenance parking space maintenance isostatic pressed condition, to realize under isostatic pressed condition lithium ion battery shaping.This predetermined time period is the constant temperature and pressure time, i.e. the isostatic pressed time, and namely to the time of lithium ion shaping, this predetermined time period can be arranged according to the number and size etc. of lithium ion battery, does not limit at this.
In use, first will treat that the lithium ion battery of shaping puts into the parking space of furnace chamber 2, then according to above-mentioned two kinds of modes, any one starts heating pressurization, until make the whole space of furnace chamber 2 reach the temperature value corresponding to required isostatic pressed condition and the force value of shaping lithium ion battery to the whole space of furnace chamber 2.When the whole space of furnace chamber 2 reaches temperature value required for shaping lithium ion battery corresponding to isostatic pressed condition and force value, load cell 3 stops pressurized, heated pressure medium, closes load cell 3 and the valve be communicated with between parking space 4 on the pipeline of pressure medium; The lithium ion battery being now arranged in furnace chamber 2 is in the condition of isostatic pressed, starts isostatic pressed shaping.
The lithium ion battery apparatus for shaping of the present embodiment, by the load cell 3 adopting adiabatic pressure container 1, be packaged in the furnace chamber 2 in adiabatic pressure container 1 and be configured in furnace chamber 2, is also provided with the parking space 4 placed and treat the lithium ion battery of shaping in furnace chamber 2; Temperature sensor 5 and pressure sensor 6 is also provided with in parking space 4; Load cell 3 is electrically connected with temperature sensor 5 and pressure sensor 6 respectively, is communicated with by pressure medium with parking space 4; And the pressure detected according to the temperature and pressure transducer 6 that temperature sensor 5 detects by load cell 3, pressure medium is adopted to carry out pressurized, heated process to parking space 4, make parking space 4 reach isostatic pressed condition needed for shaping lithium ion battery, with under isostatic pressed condition to lithium ion battery shaping.Adopting the lithium ion battery apparatus for shaping of the present embodiment, when carrying out shaping to lithium ion battery, lithium ion battery can not only be made stressed more balanced, less to the damage of lithium-ion electric core, and not yielding, improve the fail safe of lithium ion battery; Be not only applicable to the lithium ion battery shaping of rule, also can solve the potential safety hazard that the pit that formed in irregular Special-shaped lithium ion battery reforming process causes.The shaping process process of the lithium ion battery apparatus for shaping of the present embodiment is simple, easy to operate, is easy to quantize to produce.
Alternatively, on the basis of the technical scheme of above-described embodiment, load cell 3 is also for after treating that the lithium ion battery shaping of shaping is complete, the detected pressures that the detected temperatures responded to according to temperature inductor 5 and pressure inductor 6 are responded to, pressure medium is adopted to carry out pressurization cooling to parking space 2, to carry out pressurization cooling to lithium ion battery.
In practical application, furnace chamber 2 can be opened, allow in the parking space 4 of lithium ion battery in furnace chamber 2 and naturally cool.But the time of cooling is longer naturally, in order to ensure the effect of shaping, shorten cooling time, in the present embodiment, can also after the shaping of lithium ion battery isostatic pressed be completed, load cell 3 pairs of pressure medium pressurization coolings, realize realizing pressurization cooling to the whole space of furnace chamber 2, thus realize carrying out pressurization cooling to lithium ion battery.The principle that principle and the above-mentioned heating of pressurization cooling pressurizes is similar, first can cool and pressurize, or also first can pressurize and cool afterwards, finally can ensure realization cool required for force value and temperature value.
Such as, in the present embodiment, during cooling pressure medium, cooling pressure scope is-100-100MPa, and temperature range is-30-130 DEG C, and rate of temperature fall is 0-100 DEG C/min.The time span cooled of pressurizeing in the present embodiment also can be arranged according to the needs of the size of each lithium ion battery and various aspects of performance, does not limit at this.
Further alternatively, in the lithium ion battery apparatus for shaping of above-described embodiment, the pressure medium that load cell 3 adopts can be inert gas, as nitrogen and argon gas, can also be air.
Fig. 2 is the flow chart of lithium ion battery shaping methods embodiment two of the present invention, the lithium ion battery shaping methods of this enforcement is applied in the lithium ion battery apparatus for shaping shown in above-mentioned Fig. 1, as shown in Figure 2, the lithium ion battery shaping methods of this enforcement, specifically can comprise the steps:
200, will treat that the lithium ion battery of shaping puts into the parking space of the lithium ion battery of furnace chamber;
The parking space depositing lithium ion battery is provided with in furnace chamber, lithium ion battery once can put into one or more, if put into multiple lithium ion battery simultaneously, then lithium ion battery does not contact each other, to guarantee that each lithium ion battery has identical and enough temperature and pressures.
201, load cell adopts pressure medium to carry out heating pressurized treatments to parking space, makes parking space reach isostatic pressed condition needed for shaping lithium ion battery;
Particularly, load cell and parking space are by being communicated with the pipeline communication of pressure medium.Load cell is used for the temperature sensor that arranges from load cell respectively and pressure sensor obtains detected temperatures and detected pressures, and according to detected temperatures and detected pressures, adopt pressure medium to carry out pressurized, heated process to parking space, make parking space reach isostatic pressed condition needed for shaping lithium ion battery.Load cell adopts pressure medium to carry out heating pressurized treatments to parking space, specifically with reference to above-mentioned two kinds of modes embodiment illustrated in fig. 1, can not repeat them here.Such as, in the present embodiment, load cell 3 is according to detected temperatures and detected pressures, pressure medium is adopted to carry out in pressurized, heated processing procedure to parking space 4, compression rate is 0-50MPa/s, and the pressure limit in furnace chamber is 0.1-800MPa, and temperature range is-30-130 DEG C; When heating, heating rate is 0-100 DEG C/min.Further alternatively, the pressure medium of the present embodiment can be inert gas, as nitrogen and argon gas, also can be air.
202, load cell maintains parking space maintenance isostatic pressed condition predetermined time period, to realize under isostatic pressed condition lithium ion battery shaping.
It should be noted that, load cell keeps isostatic pressed condition predetermined time period at maintenance parking space, the temperature and pressure of the parking space that can detect according to temperature sensor and pressure transducer, the temperature of parking space and pressure are adjusted, makes the parking space moment meet isostatic pressed condition.
The lithium ion battery shaping methods of this enforcement, for the using method of above-mentioned lithium ion battery apparatus for shaping embodiment illustrated in fig. 1, the realization mechanism realizing lithium ion battery shaping is identical with the realization mechanism of the lithium ion battery apparatus for shaping shown in above-mentioned Fig. 1, with reference to above-mentioned record embodiment illustrated in fig. 1, can also not repeat them here in detail.
The lithium ion battery shaping methods of the present embodiment, by treating that the lithium ion battery of shaping puts into the parking space of the lithium ion battery of furnace chamber, load cell adopts pressure medium to carry out heating pressurized treatments to parking space, parking space is made to reach isostatic pressed condition needed for shaping lithium ion battery, load cell maintains parking space and keeps isostatic pressed condition predetermined time period, to realize under isostatic pressed condition lithium ion battery shaping.The lithium ion battery shaping methods adopting the present embodiment to provide, when carrying out shaping to lithium ion battery, can not only make lithium ion battery stressed more balanced, less to the damage of lithium-ion electric core, and not yielding, improves the fail safe of lithium ion battery; Be not only applicable to the lithium ion battery shaping of rule, also can solve the potential safety hazard that the pit that formed in irregular Special-shaped lithium ion battery reforming process causes.The lithium ion battery shaping methods shaping process process of the present embodiment is simple, handiness, is easy to quantize to produce.
Further alternatively, after above-mentioned step 202 embodiment illustrated in fig. 2 " load cell maintains parking space and keeps isostatic pressed condition predetermined time period; to realize under isostatic pressed condition lithium ion battery shaping ", can also comprise: according to detected temperatures and detected pressures, pressure medium is adopted to carry out pressurization cooling to parking space, to carry out pressurization cooling to lithium ion battery.
After the shaping of lithium ion battery isostatic pressed completes, can allow in the parking space of lithium ion battery in furnace chamber and naturally cool.But the time of cooling is longer naturally, in order to ensure the effect of shaping, shorten cooling time, in the present embodiment, can also after the shaping of lithium ion battery isostatic pressed be completed, load cell, to pressure medium pressurization cooling, realizes realizing pressurization cooling to the whole space of furnace chamber, thus realizes carrying out pressurization cooling to lithium ion battery.Such as, in the present embodiment, during cooling pressure medium, cooling pressure scope is-100-100MPa, and temperature range is-30-130 DEG C, and rate of temperature fall is 0-100 DEG C/min.The time span cooled of pressurizeing in the present embodiment also can be arranged according to the needs of the size of each lithium ion battery and various aspects of performance, does not limit at this.
Alternatively, the arbitrary link of above-mentioned lithium ion battery shaping methods embodiment illustrated in fig. 2 in lithium ion battery is produced all can use.
Trimming can be after fluid injection, such as, 90% be require after changing into, carry out shaping, then do first time discharge and recharge (i.e. capacity operation); Also have a small part also to have in addition to require to carry out shaping before changing into, improve bonding interface, then change into.
Below by adopt the lithium ion battery of lithium ion battery apparatus for shaping of the present invention shaping respectively with without shaping lithium ion battery, adopt the lithium ion battery of reshaping clamp shaping and adopt the performance of the lithium ion battery of vest shaping to contrast respectively.
Example one, lithium ion battery apparatus for shaping of the present invention is adopted to carry out isostatic pressed Shape correction to coiled lithium ion battery.First coiled lithium ion battery is put into isostatic pressed furnace chamber, closed furnace door, be forced into 1.1MPa, furnace temperature rises to 85 DEG C, and fixture baking 6h, cooling pressure release, completes isostatic pressed trimming.After shaping, battery is through drawing liquid, completely fill with twice charge/discharge capacity flow process after, the lithium ion battery of system.
Wherein the concrete manufacturing process of coiled lithium ion battery can be as follows:
(1) positive plate is made;
To the acid of positive active material cobalt lithium, PVDF membrane (PolyvinylideneFluoride; PVDF) binding agent and conductive carbon proportionally 95:2.5:2.5 carry out mix and blend 12h, positive-active slurry being coated thickness is afterwards on the Al foil substrate of 10 μm, then by colding pressing, and under pole piece after colding pressing is placed in the environment of 110 ± 10 DEG C, vacuumize obtained positive plate after 6 hours.
(2) negative plate is made;
By negative electrode active material graphite, SBR binding agent, CMC thickener and conductive carbon, proportionally 94:2:2:2 carries out mix and blend 12h, then vacuum low rate mixing 1h obtains cathode size; Then cathode size is coated on negative current collector Copper Foil material sheet and obtain negative plate.
(3) by above-mentioned positive plate, cut according to 58mm width, negative plate is cut according to 60mm, and barrier film is cut according to 62mm; Point positive/negative plate cut and barrier film are formed naked battery core by winding, then carries out top side seal;
Wherein barrier film can adopt the PP barrier film of 9 μm.
(4) electrolyte adopts ethylene carbonate (EC) and dimethyl carbonate (DMC) mass ratio to be 3:7,1mol/L lithium hexafluoro phosphate (LiPF
6) be the solution of lithium salts;
(5) electrolyte of implantation step (4) gained in the naked battery core after step (3) top side seal is completed Vacuum Package, then carry out changing into activation, prepare takeup type rectangular lithium ion battery.
Example two, with example one unlike: in this example, lithium ion battery is forced into 1.2MPa, furnace temperature rises to 70 DEG C.Other identical with example one, repeats no more here.
Example three, with example one unlike: in this example, lithium ion battery is step lithium ion battery, other identical with example one, repeats no more here.
Wherein the concrete manufacturing process of step lithium ion battery is as follows:
(1) positive plate is made;
(2) negative plate is made;
The concrete manufacturing process of the positive plate of step lithium ion battery and the manufacturing process of negative plate as above coiled lithium ion battery, repeats no more here.
(3) above-mentioned positive plate section is formed long 58mm, wide 45mm positive plate A.Negative plate section forms long 60mm, wide 47mm negative plate A.Barrier film is cut into long 62mm, wide 49mm barrier film A.Above-mentioned positive/negative plate and barrier film lamination are formed naked battery core A;
Wherein barrier film can adopt the PP barrier film of 9 μm.
(4) above-mentioned positive plate section is formed long 28mm, wide 45mm positive plate B.Negative plate section forms long 30mm, wide 47mm negative plate B.Barrier film is cut into long 32mm, wide 49mm barrier film B.Above-mentioned positive/negative plate and barrier film lamination are formed naked battery core B;
(5) naked battery core A and naked battery core B lamination are formed the naked battery core of step; Then naked for step battery core is carried out top side seal;
(6) electrolyte adopts ethylene carbonate (EC) and dimethyl carbonate (DMC) mass ratio to be 5:5,1mol/L lithium hexafluoro phosphate (LiPF
6) be the solution of lithium salts;
(7) electrolyte of implantation step (6) gained in the naked battery core of step after step (5) top side seal is completed Vacuum Package, then carry out changing into activation, prepare step lithium ion battery.
Example four, with example three unlike: in this example, lithium ion battery is forced into 1.2MPa, furnace temperature rises to 70 DEG C.Other identical with example three, repeats no more here.
Comparative examples one, by the coiled lithium ion battery in above-mentioned example one and example two, do not do Shape correction, fluid injection directly carries out drawing liquid after leaving standstill, completely fill with twice charge/discharge capacity flow process after, obtained lithium ion battery.
Comparative examples two, by the coiled lithium ion battery in above-mentioned comparative examples one, fluid injection leaves standstill rear conventional reshaping clamp and carries out shaping, shaping pressure is 1MPa, after shaping, drawing liquid is carried out to method described in same example one, completely fill with twice charge/discharge capacity flow process after, obtained lithium ion battery, repeats no more here.
Comparative examples three, by the step lithium ion battery in above-mentioned example three and example four, be fixed with vest, then carry out shaping with conventional reshaping clamp, all the other manufacture methods, with example one, repeat no more here.
Performance test is carried out to the lithium ion battery of example one to example four and the lithium ion battery of comparative examples one to comparative examples three below, wherein, the lithium ion battery of example one to example four correspondence is numbered S1-S4, and the lithium ion battery of comparative examples one to comparative examples three is numbered D1-D3.
1, lithium ion battery surface testing flatness
Lithium ion battery surface evenness weighs a major criterion of lithium ion battery outward appearance.Good lithium ion battery should have an enough excellent evenness.The evenness assessment of lithium ion battery generally can be realized by the scanning of line flatness: along battery levels direction, scan lithium ion battery upper surface and lower surface.The difference of the maxima and minima that same surface is scanned can characterize the evenness of lithium ion battery.In order to verify the appearance of the lithium ion battery of lithium ion battery apparatus for shaping provided by the present invention process, carry out the scanning of line flatness along its length to step lithium ion battery S3 and D3, scanning is got and is a little carried out according to every 0.1mm.Fig. 3 is comparative examples three lithium ion battery length direction upper and lower surface line sweep schematic diagram of the present invention; Fig. 4 is example three lithium ion battery length direction upper and lower surface line sweep schematic diagram of the present invention.As shown in Figure 3 and Figure 4, Fig. 3 and Fig. 4 is shown as the result schematic diagram of length direction scanning respectively.Obviously can find out according to result in figure, demonstrate obvious advantage by the lithium ion battery of lithium ion battery apparatus for shaping provided by the present invention process.Lithium ion battery is smooth without depression.And be in step place appearance one significant pit with the vest used of the lithium ion battery of routine plastic fixture.In fact, the lithium ion battery lower surface evenness of the isostatic pressed shaping in figure is 0.051mm, and the lithium ion battery lower surface evenness of vest shaping reaches 0.168mm.Following table 1 is depicted as the lithium ion battery lower surface flatness data of isostatic pressed shaping and the shaping of routine plastic fixture.From table, data can obviously be found out, isostatic pressed shaping lithium ion battery has less lower surface evenness.
Table 1
| Training system | Battery 1 | Battery 2 | Battery 3 | Battery 4 | Battery 5 | Battery 6 |
| Reshaping clamp shaping | 0.168mm | 0.157mm | 0.166mm | 0.182mm | 0.159mm | 0.173mm |
| Isostatic pressed shaping | 0.051mm | 0.062mm | 0.049mm | 0.068mm | 0.058mm | 0.061mm |
2, lithium ion battery thickness measuring
According to the method for example one, comparative examples one and comparative examples two, prepare 100 coiled lithium ion batteries S1, D1 and D2 respectively.Use 700g pressure, measure above-mentioned three groups of lithium ion batteries before shaping, the thickness of the battery after shaping and after capacity.Wherein refer to after capacity after lithium ion battery twice discharge and recharge.Fig. 5 is the lithium ion battery thickness measuring schematic diagrames of each 100 lithium ion batteries of example one of the present invention, comparative examples one and comparative examples two before shaping, after shaping and after capacity; Wherein D1 is the lithium ion battery of non-shaping, and D2 is the lithium ion battery of fixture shaping, and S1 is the lithium ion battery of isostatic pressed shaping.As shown in Figure 5.As can be seen from the figure, the thickness average of the lithium ion battery of the lithium ion battery of non-shaping, the lithium ion battery of fixture shaping and isostatic pressed shaping is respectively 3.23mm, 3.22mm and 3.22mm; After shaping, fixture shaping and isostatic pressed shaping make lithium ion battery thickness be reduced to 3.05mm and 3.09mm respectively, but after capacity flow process, fixture shaping and isostatic pressed shaping make lithium ion battery thickness rebound respectively to 3.17mm and 3.13mm.The visible lithium ion battery through isostatic pressed shaping more evenly has less bounce-back thickness because battery is stressed.
3, lithium ion battery cycle life and analyse lithium test
Fig. 6 is 45 DEG C of loop test schematic diagrames of example three of the present invention and comparative examples three.As shown in Figure 6, choose example three and each 6 lithium ion batteries of comparative examples three and carry out 45 DEG C of cycle lives tests, test result as shown in Figure 6, as can be seen from Figure 6, after isostatic pressed shaping lithium ion battery is circulated throughout at 500 times, capacity can also reach 93.1% of initial capacity, and the lithium ion battery of reshaping clamp shaping is circulated throughout capacity at 500 times only Yus 89.3%.This be due to the lithium ion battery of isostatic pressed shaping stressed evenly, be more conducive to the aging of battery, less to the solid electrolyte membrane damage of lithium ion battery.Lithium ion battery has better cycle performance.And through the lithium ion battery of reshaping clamp shaping, lithium ion battery discontinuity, larger injury effect is had to the solid electrolyte film (SEI film) of inside lithium ion cell in reforming process, lithium ion battery is reformed to inner SEI film at follow-up needs, consume part lithium, thus the circulation of lithium ion battery is affected.
Above-mentioned lithium ion battery after 500 times are circulated throughout is disassembled, analyses lithium situation with what assess its internal anode.The anode of lithium ion battery that table 2 is isostatic pressed shaping and reshaping clamp shaping after circulation analyses lithium assessment, as shown in table 2 below, can obviously be found out by table 2, the lithium ion battery of isostatic pressed shaping does not occur anyly analysing lithium, and anode of lithium ion battery still remains good interface.And by the step place of the lithium ion battery of reshaping clamp shaping, due to the discontinuity in reforming process, all occur to a certain degree analyse lithium.Above-mentioned cycle life and analyse lithium test comparison and can find out isostatic pressed shaping lithium ion battery, compared to prior art, has obvious advantage.
Table 2
The lithium ion battery shaping methods of the present embodiment, by the lithium ion battery of lithium ion battery apparatus for shaping shaping respectively with the lithium ion battery without shaping, adopt the lithium ion battery of reshaping clamp shaping and adopt the performance of the lithium ion battery of vest shaping to contrast respectively, find the lithium ion battery isostatic pressed shaping methods adopting the present embodiment to provide, shaping lithium ion battery has less lower surface evenness, because lithium ion battery is stressed, more evenly there is less bounce-back thickness, and cycle life is longer, analyse lithium degree lighter, therefore the damage of lithium ion battery isostatic pressed shaping methods to lithium-ion electric core is less, and it is not yielding, improve the fail safe of lithium ion battery, be not only applicable to the lithium ion battery shaping of rule, also can solve the potential safety hazard that the pit that formed in irregular Special-shaped lithium ion battery reforming process causes.The shaping process process of the lithium ion battery shaping methods of the present embodiment is simple, easy to operate, is easy to quantize to produce.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a lithium ion battery apparatus for shaping, it is characterized in that, comprise: adiabatic pressure container, the load cell being packaged in the furnace chamber in described adiabatic pressure container and being configured in described furnace chamber, also be provided with the parking space placed and treat the lithium ion battery of shaping in described furnace chamber, in described parking space, be also provided with temperature sensor and pressure sensor, described load cell is electrically connected with described temperature sensor and described pressure sensor respectively, and be communicated with by pressure medium with described parking space, described load cell is used for obtaining detected temperatures and detected pressures from described temperature sensor and described pressure sensor respectively, and according to described detected temperatures and described detected pressures, described pressure medium is adopted to carry out pressurized, heated process to described parking space, described parking space is made to reach isostatic pressed condition described in shaping needed for lithium ion battery, and maintain described parking space and keep predetermined time period under described isostatic pressed condition, to realize under described isostatic pressed condition described lithium ion battery shaping.
2. device according to claim 1, is characterized in that, when adopting described pressure medium to carry out pressurized, heated to described parking space, the pressure limit of described parking space is 0.1-800MPa, and temperature range is-30-130 DEG C; When heating, heating rate is 0-100 DEG C/min.
3. device according to claim 1, it is characterized in that, described load cell, also for described treat that the lithium ion battery shaping of shaping is complete after, according to described detected temperatures and described detected pressures, described pressure medium is adopted to carry out pressurization cooling to described parking space, to carry out pressurization cooling to described lithium ion battery.
4. device according to claim 1, is characterized in that, when adopting described pressure medium to carry out pressurization cooling to described parking space, cooling pressure scope is-100-100MPa, and temperature range is-30-130 DEG C, and rate of temperature fall is 0-100 DEG C/min.
5., according to the arbitrary described device of claim 1-4, it is characterized in that, described pressure medium is air or inert gas.
6. a lithium ion battery shaping methods, described method is applied in the lithium ion battery apparatus for shaping described in the claims 1, it is characterized in that, described method comprises:
To treat that the lithium ion battery of shaping puts into the parking space of the lithium ion battery of furnace chamber;
Described load cell adopts pressure medium to carry out heating pressurized treatments to described parking space, makes described parking space reach isostatic pressed condition described in shaping needed for lithium ion battery;
Described load cell maintains described parking space and keeps described isostatic pressed condition predetermined time period, to realize under described isostatic pressed condition described lithium ion battery shaping.
7. method according to claim 6, it is characterized in that, described load cell adopts described pressure medium to carry out heating in the process of pressurized treatments to described parking space, and pressure limit is 0.1-800MPa, temperature range is 20-100 DEG C, and heating rate is 0-100 DEG C/min.
8. method according to claim 6, is characterized in that, described load cell maintains described parking space and keeps described isostatic pressed condition predetermined time period, and to realize to after described lithium ion battery shaping under described isostatic pressed condition, described method also comprises:
According to described detected temperatures and described detected pressures, described pressure medium is adopted to carry out pressurization cooling to described parking space, to carry out pressurization cooling to described lithium ion battery.
9. method according to claim 6, it is characterized in that, according to described detected temperatures and described detected pressures, described pressure medium is adopted to carry out pressurizeing in the process of cooling to described parking space, cooling pressure scope is-100-100MPa, temperature range is-30-200 DEG C, and rate of temperature fall is 0-100 DEG C/min;
Described pressure medium is air or inert gas.
10. according to the arbitrary described method of claim 6-9, it is characterized in that, the arbitrary shaping link of described lithium ion battery shaping methods in described lithium ion battery is produced all can use.
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