CN109638370A - A kind of chemical synthesizing method of soft bag lithium ionic cell - Google Patents
A kind of chemical synthesizing method of soft bag lithium ionic cell Download PDFInfo
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- CN109638370A CN109638370A CN201811567197.1A CN201811567197A CN109638370A CN 109638370 A CN109638370 A CN 109638370A CN 201811567197 A CN201811567197 A CN 201811567197A CN 109638370 A CN109638370 A CN 109638370A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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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Abstract
The present invention provides a kind of chemical synthesizing method of soft bag lithium ionic cell, after battery liquid-filling, include the following steps, the chemical conversion of (1) pressure: certain pressure and at a temperature of, pressure limiting is prescribed a time limit to battery progress constant-current charge with the electric current of 0.01~0.03C, it shelves, then pressure limiting is prescribed a time limit to battery progress constant-current charge with the electric current of 0.05~0.1C, cold pressing moulding is carried out to battery；(2) roll-in is sealed: the battery after cold pressing moulding being placed in progress ontology roll-in in roll squeezer, the battery through roll-in is placed in degas vacuum environment, airbag is punctured, is vented and seals；(3) secondary pressure be melted into: certain pressure and at a temperature of, with the electric current of 0.1~0.2C prescribe a time limit pressure limiting pair battery progress constant-current charge, carry out cold pressing moulding after shelving；(4) it encapsulates: stand 18 at high temperature~for 24 hours, ontology roll-in and exhaust sealing are carried out, the chemical conversion of soft-package battery is completed.The present invention is melted into using two steps, and gas and aqueous vapor are discharged in time, and the SEI film of identical consistency is formed conducive to positive/negative plate surface, improves the quality of SEI film.
Description
Technical field
The invention belongs to technical field of lithium-ion battery, and in particular to a kind of chemical conversion side of soft bag lithium ionic cell
Method.
Background technique
In battery field, it is green that lithium ion battery belongs to a kind of high-energy-density small in size, light-weight, that safety coefficient is good
Color environment protection type battery.Therefore, lithium ion battery has obtained rapidly the industrial applications of popularity at present, especially as power,
The power source and energy-storage battery of communication field occupy a large amount of market ratio.It mainly rely on lithium ion anode with
Insertion and deintercalation between cathode carry out work.
Lithium ion battery production is made of multiple tracks difference process, and formation process therein belongs to one of critical process, this work
Sequence directly determines lithium ion battery quality good or not.Now, the industry mainly carries out lithium ion battery chemical conversion using charging modes,
One layer of passivating film, i.e. solid electrolyte interface film are formed on negative electrode tab surface after chemical conversion, generally by solid electrolyte interface film letter
Referred to as SEI film, SEI film play the part of critically important role in lithium ion battery whole life cycle, especially have greatly to electrical property
It influences, the quality of SEI film will directly influence the cycle life, stability and self discharge etc. of battery.Lithium ion battery exists
During being made can remaining a little moisture, water is heated in formation process and forms steam, and active steam easily penetrates just
In the SEI film of forming, i.e., the chemical reaction of series of negative occurs with built-in electrolyte, to influence SEI film post forming
Quality, it is also possible to lithium ion can be consumed, so that discharge time shortens, so must pay close attention in lithium ion battery manufacturing process
SEI film quality of forming film is important to pay close attention to the consistency of SEI film.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of changes of soft bag lithium ionic cell
At method.
To achieve the goals above or other purposes, the present invention are achieved through the following technical solutions:
A kind of chemical synthesizing method of soft bag lithium ionic cell after battery liquid-filling, includes the following steps,
The chemical conversion of (1) pressure: certain pressure and at a temperature of, pressure limiting is prescribed a time limit to battery with the electric current of 0.01~0.03C
Constant-current charge is carried out, 1~2min is shelved, then pressure limiting is prescribed a time limit to battery progress constant-current charge with the electric current of 0.05~0.1C, shelves 1
~2min carries out cold pressing moulding to battery；
(2) roll-in is sealed: the battery that step (1) is cold-pressed after moulding is placed in roll squeezer and carries out ontology roll-in, it will be through roller
The battery of pressure is placed in degas vacuum environment, then is evacuated exhaust, is finally sealed；
(3) secondary pressure be melted into: certain pressure and at a temperature of, pressure limiting is prescribed a time limit to step (2) with the electric current of 0.1~0.2C
Battery carry out constant-current charge, carry out cold pressing moulding after shelving；
(4) it encapsulates: after step (3), stand 18 at high temperature~for 24 hours, by step (2) progress ontology roll-in and exhaust
The chemical conversion of soft-package battery is completed in sealing；
Wherein in step (2) and step (4), the pressure of ontology roll-in is 500~800Kg, and roll-in speed is 50mm/s, when
Between be 5S.
Further, in step (1), the certain pressure is 1080~1270kgf, and the temperature is 25~55 DEG C.
Further, in step (1), the pressure limiting charged with the electric current of 0.01~0.03C is 3.0~3.2V, in limited time
For 110~150min；The pressure limiting charged with the electric current of 0.05~0.1C is in limited time 85~110min for 3.4~3.6V.
Further, in step (1) and step (3), in the cold pressing moulding, pressure is 1227~1267kgf, and the time is
5min, battery core surface temperature are 22~28 DEG C.
Further, in step (2), pumping exhaust process is, battery be placed in vacuum cavity after by band on battery Soft Roll
Some airbags, which puncture, to be evacuated, and is reused pressure plate and is carried out pressure exhaust, and wherein vacuum pumpdown time is 20~30S,
The pressure of pressure plate is 0.3~0.5Mpa, and vacuum degree is -90~-100Kpa, the guarantor's liquid measure need >=2.25Ah/g of battery core at this time；
The sealing is seals after pumping to battery body side using heat sealing machine, and wherein the upper lower head temperature of heat sealing machine is
197~203 DEG C, end socket pressure is 0.6~0.8Mpa, vacuum degree≤- 98Kpa.
Further, in step (3), the certain pressure be 1050~1247kgf, 25~55 DEG C of temperature.
Further, in step (3), the pressure limiting charged with the electric current of 0.1~0.2C is in limited time for 3.7~4.0V
150~180min.
Further, in step (4), the high temperature is 35~55 DEG C.
The utility model has the advantages that
1, the present invention is using being melted into two steps, defined pressure, at a temperature of carry out low current charge, the wherein first step
Ingredient combines used calandering steps, the gas and water effectively generated in discharge formation process in time at charging twice, with this
Gas is conducive to negative electrode tab surface and forms the preferable SEI film of compactness, improves the quality of SEI film；And chemical conversion work step is simple, Yi Shi
It is existing；
2, the battery that first stage chemical conversion is completed in the present invention, carries out roll-in under the pressure of 500~800Kg, on the one hand
Steam inside mechanicalness extrusion, optimizes the molding condition of SEI film；On the other hand cold to external flexible packing lithium ion battery simultaneously
Compression moulding shape can improve Battery formation effect and presentation quality.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Embodiment 1: flexible packing lithium ion battery specification is 48Ah in the present embodiment；
A kind of chemical synthesizing method of soft bag lithium ionic cell, after battery liquid-filling, comprising the following steps: (1) pressure chemical conversion:
At pressure 1270kgf and 40 DEG C of temperature, with the electric current of 0.02C, 110min, pressure limiting 3.0V fill battery progress constant current in limited time
Electricity shelves 1min, then carries out constant-current charge to battery with the electric current of 0.05C, prescribe a time limit 85min, pressure limiting 3.4V, shelves 1min, right
Battery carries out cold pressing moulding, and the pressure for being cold-pressed moulding is 1267kgf, time 5min, 28 DEG C of battery core surface temperature；(2) roll-in is sealed
Mouthful: the battery that step (1) is cold-pressed after moulding is placed in roll squeezer and carries out ontology roll-in, the pressure of ontology roll-in is 800Kg, roller
Press speed be 50mm/s, time 5S, the battery through roll-in is placed in degas vacuum environment, the airbag that will be had on Soft Roll
It punctures, then is evacuated, wherein puncturing vacuum pumpdown time after airbag is 20S, the pressure of pressure plate is 0.3Mpa, vacuum
Degree is -90Kpa, and the guarantor's liquid measure of battery core at this time is 2.25Ah/g, is finally sealed, and the sealing is after pumping to battery sheet
Body side is sealed using heat sealing machine, and wherein the upper lower head temperature of heat sealing machine is 197 DEG C, and end socket pressure is 0.6Mpa, very
Reciprocal of duty cycle is -98Kpa；(3) secondary pressure is melted into: at pressure 1050kgf, 55 DEG C of temperature, with the electric current of 0.2C, in limited time
150min, pressure limiting 3.7V carry out constant-current charge to the battery of step (2), carry out cold pressing moulding after shelving, be cold-pressed the pressure of moulding
For 1267kgf, time 5min, 28 DEG C of battery core surface temperature；(4) it encapsulates: after step (3), standing for 24 hours, press at 600 DEG C
Step (2) carries out ontology roll-in and exhaust sealing, and wherein the pressure of ontology roll-in is 800Kg, roll-in speed is 50mm/s, the time
For 5S, that is, complete the chemical conversion of soft-package battery.
Embodiment 2: flexible packing lithium ion battery specification is 45Ah in the present embodiment；
A kind of chemical synthesizing method of soft bag lithium ionic cell, after battery liquid-filling, comprising the following steps: (1) pressure chemical conversion:
At pressure 1270kgf and 40 DEG C of temperature, with the electric current of 0.02C, 110min, pressure limiting 3.0V fill battery progress constant current in limited time
Electricity shelves 1min, then carries out constant-current charge to battery with the electric current of 0.05C, prescribe a time limit 85min, pressure limiting 3.4V, shelves 1min, right
Battery carries out cold pressing moulding, and the pressure for being cold-pressed moulding is 1200kgf, time 5min, 28 DEG C of battery core surface temperature；(2) roll-in is sealed
Mouthful: the battery that step (1) is cold-pressed after moulding is placed in roll squeezer and carries out ontology roll-in, the pressure of ontology roll-in is 700Kg, roller
Press speed be 50mm/s, time 5S, the battery through roll-in is placed in degas vacuum environment, the airbag that will be had on Soft Roll
It punctures, then is evacuated, wherein puncturing vacuum pumpdown time after airbag is 30S, the pressure of pressure plate is 0.5Mpa, vacuum
Degree is -100Kpa, and the guarantor's liquid measure of battery core at this time is 2.25Ah/g, is finally sealed, and the sealing is after pumping to battery
Ontology side is sealed using heat sealing machine, and wherein the upper lower head temperature of heat sealing machine is 203 DEG C, and end socket pressure is 0.8Mpa,
Vacuum degree is -98Kpa；(3) secondary pressure is melted into: under pressure 1050kgf, temperature 45 C, with the electric current of 0.2C, in limited time
150min, pressure limiting 3.7V carry out constant-current charge to the battery of step (2), carry out cold pressing moulding after shelving, be cold-pressed the pressure of moulding
For 1200kgf, time 5min, 28 DEG C of battery core surface temperature；(4) it encapsulates: after step (3), standing for 24 hours, press at 600 DEG C
Step (2) carries out ontology roll-in and exhaust sealing, and wherein the pressure of ontology roll-in is 800Kg, roll-in speed is 50mm/s, the time
For 5S, that is, complete the chemical conversion of soft-package battery.
Embodiment 3: flexible packing lithium ion battery specification is 48Ah in the present embodiment；
A kind of chemical synthesizing method of soft bag lithium ionic cell, after battery liquid-filling, comprising the following steps: (1) pressure chemical conversion:
At pressure 1080kgf and 35 DEG C of temperature, with the electric current of 0.01C, 150min, pressure limiting 3.2V fill battery progress constant current in limited time
Electricity shelves 2min, then carries out constant-current charge to battery with the electric current of 0.1C, prescribe a time limit 110min, pressure limiting 3.6V, shelves 1min, right
Battery carries out cold pressing moulding, and the pressure for being cold-pressed moulding is 1227kgf, time 5min, 22 DEG C of battery core surface temperature；(2) roll-in is sealed
Mouthful: the battery that step (1) is cold-pressed after moulding is placed in roll squeezer and carries out ontology roll-in, the pressure of ontology roll-in is 500Kg, roller
Press speed be 50mm/s, time 5S, the battery through roll-in is placed in degas vacuum environment, the airbag that will be had on Soft Roll
It punctures, then is evacuated, wherein puncturing vacuum pumpdown time after airbag is 25S, the pressure of pressure plate is 0.4Mpa, vacuum
Degree is -95Kpa, and the guarantor's liquid measure of battery core at this time is 2.25Ah/g, is finally sealed, and the sealing is after pumping to battery sheet
Body side is sealed using heat sealing machine, and wherein the upper lower head temperature of heat sealing machine is 200 DEG C, and end socket pressure is 0.6Mpa, very
Reciprocal of duty cycle is -98Kpa；(3) secondary pressure is melted into: at pressure 1247kgf, 35 DEG C of temperature, with the electric current of 0.1C, in limited time
180min, pressure limiting 3.4V carry out constant-current charge to the battery of step (2), carry out cold pressing moulding after shelving, be cold-pressed the pressure of moulding
For 1227kgf, time 5min, 28 DEG C of battery core surface temperature；(4) it encapsulates: after step (3), standing 18h at 50 DEG C, press
Step (2) carries out ontology roll-in and exhaust sealing, and wherein the pressure of ontology roll-in is 500Kg, roll-in speed is 50mm/s, the time
For 5S, that is, complete the chemical conversion of soft-package battery.
Embodiment 4: flexible packing lithium ion battery specification is 48Ah in the present embodiment；
A kind of chemical synthesizing method of soft bag lithium ionic cell, after battery liquid-filling, comprising the following steps: (1) pressure chemical conversion:
At pressure 1150kgf and 55 DEG C of temperature, with the electric current of 0.03C, 130min, pressure limiting 3.1V fill battery progress constant current in limited time
Electricity shelves 1min, then carries out constant-current charge to battery with the electric current of 0.075C, prescribe a time limit 100min, pressure limiting 3.5V, shelves 2min,
Cold pressing moulding is carried out to battery, the pressure for being cold-pressed moulding is 1240kgf, time 5min, 25 DEG C of battery core surface temperature；(2) roll-in
Sealing: being cold-pressed the battery after moulding for step (1) and be placed in roll squeezer and carry out ontology roll-in, the pressure of ontology roll-in be 650Kg,
Roll-in speed is 50mm/s, time 5S, the battery through roll-in is placed in degas vacuum environment, the gas that will be had on Soft Roll
Bag punctures, then is evacuated, wherein puncturing vacuum pumpdown time after airbag is 20S, the pressure of pressure plate is 0.5Mpa, very
Reciprocal of duty cycle is -100Kpa, and the guarantor's liquid measure of battery core at this time is 2.25Ah/g, is finally sealed, and the sealing is after pumping to electricity
Pond ontology side is sealed using heat sealing machine, and wherein the upper lower head temperature of heat sealing machine is 200 DEG C, and end socket pressure is
0.5Mpa, vacuum degree are -98Kpa；(3) secondary pressure be melted into: at pressure 1150kgf, 35 DEG C of temperature, with the electric current of 0.15C,
165min, pressure limiting 3.85V in limited time carry out constant-current charge to the battery of step (2), cold pressing moulding are carried out after shelving, is cold-pressed moulding
Pressure be 1240kgf, time 5min, 25 DEG C of battery core surface temperature；(4) it encapsulates: after step (3), being stood at 40 DEG C
18h carries out ontology roll-in and exhaust sealing by step (2), and wherein the pressure of ontology roll-in is 650Kg, roll-in speed is 50mm/
S, the time is 5S, that is, completes the chemical conversion of soft-package battery.
Comparative example 1
By formation cabinet on the battery after fluid injection, it is embodied in step are as follows: in 45 DEG C of environment, 1min is shelved, with 0.02C constant current
Charging, pressure limiting 3.0V, in limited time 120min；Shelve 1min；The electric current constant-current charge of 0.2C is used again, in limited time 180min, pressure limiting 4.0V,
Finally terminate to be melted into.
Comparative example 2
After battery liquid-filling, comprising the following steps: (1) pressure chemical conversion: at pressure 1150kgf and 55 DEG C of temperature, with
The electric current of 0.03C, in limited time 130min, pressure limiting 3.1V carry out constant-current charge to battery, shelve 1min, carry out cold pressing modeling to battery
Shape, the pressure for being cold-pressed moulding is 1240kgf, time 5min, 25 DEG C of battery core surface temperature；(2) roll-in is sealed: step (1) is cold
Battery after compression moulding shape, which is placed in roll squeezer, carries out ontology roll-in, and the pressure of ontology roll-in is 800Kg, roll-in speed is 20mm/
S, the time is 6S, and the airbag on the battery through roll-in is punctured, then is exhausted, is finally sealed；(3) secondary pressure
At: at pressure 1150kgf, 35 DEG C of temperature, with the electric current of 0.15C, in limited time 165min, pressure limiting 3.85V, to the electricity of step (2)
Pond carries out constant-current charge, carries out cold pressing moulding after shelving, and the pressure for being cold-pressed moulding is 1240kgf, time 5min, battery core surface temperature
25 DEG C of degree；(4) it encapsulates: after step (3), 18h is stood at 40 DEG C, that is, completes the chemical conversion of soft-package battery.
Experiment: the identical soft bag lithium ionic cell of the specification that same batch is produced is divided into 6 groups, embodiment 1 is respectively adopted
The chemical synthesizing method of the soft bag lithium ionic cell of~4 and comparative example 1-2 is melted into, after chemical conversion to soft bag lithium ionic cell into
The full electric dismantling of row, flatness, hardness and circulation circulation, test method are as follows: the interface state of full electricity dismantling observation negative electrode tab, surface
With the presence or absence of exception；Whether flatness, hardness and the standard sample comparison of soft bag lithium ionic cell is qualified；Loop test is will be soft
Packet lithium ion battery compares capacity retention ratio after 500 weeks with 1C current charging and discharging, circulation.Test result is shown in Tables 1 and 2.
1 all-round property testing result of table
The result of 2 cycle performance of table test
| Project | Circulating cycle number | Actual capacity/AH | Terminate capacity/AH | Capacity retention ratio |
| Embodiment 1 | 500 | 44.079 | 42.4693 | 96.35% |
| Embodiment 2 | 500 | 44.6666 | 42.9068 | 96.06% |
| Embodiment 3 | 500 | 44.4756 | 43.4516 | 97.70% |
| Embodiment 4 | 500 | 44.7315 | 43.4075 | 97.04% |
| Comparative example 1 | 325 | 46.471 | 37.012 | 79.62% |
| Comparative example 2 | 400 | 45.742 | 40.6014 | 83.68% |
As can be seen from Table 1 and Table 2, each side's tropism of the soft package lithium battery of the chemical synthesizing method preparation used through the invention
It can be superior to comparative example.
The above, only presently preferred embodiments of the present invention, not to the present invention in any form with substantial limitation,
It should be pointed out that under the premise of not departing from the method for the present invention, can also be made for those skilled in the art
Several improvement and supplement, these are improved and supplement also should be regarded as protection scope of the present invention.All those skilled in the art,
Without departing from the spirit and scope of the present invention, when made using disclosed above technology contents it is a little more
Dynamic, modification and the equivalent variations developed, are equivalent embodiment of the invention；Meanwhile all substantial technologicals pair according to the present invention
The variation, modification and evolution of any equivalent variations made by above-described embodiment, still fall within the range of technical solution of the present invention
It is interior.
Claims (8)
1. a kind of chemical synthesizing method of soft bag lithium ionic cell, which is characterized in that after battery liquid-filling, include the following steps,
The chemical conversion of (1) pressure: certain pressure and at a temperature of, pressure limiting is prescribed a time limit to battery progress with the electric current of 0.01~0.03C
Constant-current charge, shelves 1~2min, then carries out constant-current charge to battery with the pressure limiting of prescribing a time limit of the electric current of 0.05~0.1C, shelve 1~
2min carries out cold pressing moulding to battery；
(2) roll-in is sealed: the battery that step (1) is cold-pressed after moulding is placed in roll squeezer and carries out ontology roll-in, it will be through roll-in
Battery is placed in the vacuum cavity of degas pumping, is carried out pumping exhaust, is finally sealed；
(3) secondary pressure is melted into: certain pressure and at a temperature of, pressure limiting is prescribed a time limit to the electricity of step (2) with the electric current of 0.1~0.2C
Pond carries out constant-current charge, carries out cold pressing moulding after shelving；
(4) encapsulate: after step (3), at high temperature stand 18~for 24 hours, by step (2) carry out ontology roll-in and exhaust envelope
Mouthful, that is, complete the chemical conversion of soft-package battery；
Wherein in step (2) and step (4), the pressure of ontology roll-in is 500~800Kg, and roll-in speed is 50mm/s, and the time is
5S。
2. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that described certain in step (1)
Pressure is 1080~1270kgf, and the temperature is 25~55 DEG C.
3. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that in step (1), with 0.01~
The pressure limiting that the electric current of 0.03C charges is 3.0~3.2V, is in limited time 110~150min；It is carried out with the electric current of 0.05~0.1C
The pressure limiting of charging is 3.4~3.6V, is in limited time 85~110min.
4. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that step (1) and step (3)
In, in the cold pressing moulding, pressure is 1227~1267kgf, and time 5min, battery core surface temperature is 22~28 DEG C.
5. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that in step (2), pumping exhaust
Process is that the airbag having on battery Soft Roll is punctured after being placed in vacuum cavity and is evacuated by battery, reuses binder
Plate carries out pressure exhaust, and wherein vacuum pumpdown time is 20~30S, and the pressure of pressure plate is 0.3~0.5Mpa, and vacuum degree is-
90~-100Kpa, the guarantor's liquid measure need >=2.25Ah/g of battery core at this time；The sealing is to use after pumping to battery body side
Heat sealing machine is sealed, and wherein the upper lower head temperature of heat sealing machine is 197~203 DEG C, and end socket pressure is 0.6~0.8Mpa, very
Reciprocal of duty cycle≤- 98Kpa.
6. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that described certain in step (3)
Pressure be 1050~1247kgf, 25~55 DEG C of temperature.
7. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that in step (3), with 0.1~
The pressure limiting that the electric current of 0.2C charges is 3.7~4.0V, is in limited time 150~180min.
8. the chemical synthesizing method of soft bag lithium ionic cell as described in claim 1, which is characterized in that in step (4), the high temperature
It is 35~55 DEG C.
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| CN110518301A (en) * | 2019-08-05 | 2019-11-29 | 东莞维科电池有限公司 | A kind of soft bag lithium ionic cell chemical synthesizing method |
| CN110571476A (en) * | 2019-09-18 | 2019-12-13 | 河南锂动电源有限公司 | preparation method of nickel cobalt lithium manganate laminated soft-package battery and battery |
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| CN113078363A (en) * | 2021-02-22 | 2021-07-06 | 天津力神电池股份有限公司 | Method for prolonging cycle life of lithium ion battery |
| CN113471544A (en) * | 2021-06-29 | 2021-10-01 | 合肥国轩高科动力能源有限公司 | Formation pretreatment method and formation method of soft package lithium ion battery |
| CN114628791A (en) * | 2022-01-29 | 2022-06-14 | 北京新能源汽车股份有限公司 | Battery cell, method for improving high-temperature performance of battery cell, battery and new energy vehicle |
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