CN109659625A - A kind of electrolyte wetting method of soft bag lithium ionic cell - Google Patents
A kind of electrolyte wetting method of soft bag lithium ionic cell Download PDFInfo
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- CN109659625A CN109659625A CN201811592513.0A CN201811592513A CN109659625A CN 109659625 A CN109659625 A CN 109659625A CN 201811592513 A CN201811592513 A CN 201811592513A CN 109659625 A CN109659625 A CN 109659625A
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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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- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- 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 invention discloses a kind of electrolyte wetting methods of soft bag lithium ionic cell, gradation fluid injection combination gradient is taken to vacuumize the mode of pressure maintaining, the soft-package battery after fluid injection is placed in a vacuum drying oven respectively, 40-85 DEG C of temperature of setting, be arranged vacuum degree gradient carry out gradually vacuumize pressure maintaining, slowly reduce solid-gas-liquid three phase boundary there are gas phase drag, prevent pressure difference excessive so as to cause pole piece deformation generation, and electrolyte is allowed directly to contact with pole piece, reduce infiltrating time；Method of the invention is simple and easy, convenient and efficient, is suitable for actual production and operates, practical value is significant.
Description
Technical field
The present invention relates to field of lithium ion battery more particularly to a kind of electrolyte wetting methods of soft bag lithium ionic cell.
Background technique
Lithium ion battery have specific capacity is high, self discharge is small, operating temperature range is wide, voltage platform is high, have extended cycle life,
Memory-less effect, it is environmentally friendly the features such as, be widely used to the fields such as mobile phone, laptop, electric tool, and
Gradually promoted in electric car field.
After lithium battery is using the standard for reaching discarded or when catastrophic failure, usually it is disassembled to analyze, be
Any reason leads to performance degradation or the rapid drawdown of battery.When carrying out dismantling analysis to lithium battery, discovery cycle performance is less
Good battery is often bad related with effect of impregnation of the electrolyte to pole piece.When electrolyte effect of impregnation is bad, ion transmits road
Diameter becomes remote, hinders shuttle of the lithium ion between positive and negative anodes, and not in contact with the pole piece of electrolyte, can not to participate in battery electrochemical anti-
It answers, while cell interface resistance increases, and influences high rate performance, discharge capacity and the service life of lithium battery.The performance of battery will
It will receive very big influence, therefore the immersion step of electrolyte is very important in battery after fluid injection.
Have some correlative studys, such as a kind of electrolysis of soft bag lithium ionic cell of Chinese patent CN107895815A at present
A kind of method is disclosed in liquid wetting method, also needs to be passed through inert gas after vacuumizing lithium ion battery, and need
It repeats 1-8 times, this method higher cost, process CIMS is cumbersome.And without the standard of specific vacuum degree and number of repetition, needle
To different battery cores, there are also different operations to need to reset for different net liquid amounts；It is unfavorable for the operation of actual production.
Summary of the invention
Goal of the invention: in order to overcome defect existing in the prior art, the invention proposes a kind of soft bag lithium ionic cells
Electrolyte wetting method, it is simple and feasible, it is easy to operate, it is high-efficient, not only effectively reduce infiltrating time, to battery pole piece without
Adverse effect, and improve cycle performance of battery.
Technical solution: in order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is as follows: a kind of Soft Roll lithium ion
The electrolyte wetting method of battery, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；
(2) it carries out multiple gradient and is evacuated to vacuum degree to be pressure maintaining 1-2min after -90KPa；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
Multiple gradient vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, repeats the multiple of step (2)
Gradient vacuumizes and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 40-85 DEG C at vacuum oven in stand 4-12h.
The present invention, can be insufficient to diaphragm, pole piece infiltration to avoid electrolyte in such a way that gradation fluid injection vacuumizes again
The phenomenon that, the abundant infiltration convenient for electrolyte to pole piece improves solid-liquid contact rate, expands contact area, constant in electrolyte content
In the case where, infiltrating time can be shortened.
4-12h is stood in the vacuum oven at 40-85 DEG C after the completion of vacuumizing, further shortens infiltrating time, is released
Pole piece stress is put, the generation of pole piece deformation after preventing top side from sealing.
More preferably, temperature setting is 40-85 DEG C in a vacuum drying oven in step (1).
The multiple gradient vacuumizes specially carries out gradually multiple gradient in the vacuum ranges of -25KPa -90KPa
It vacuumizes and the mode of pressure maintaining carries out；Solid-gas-liquid three phase boundary can slowly be reduced, and there are gas phase drags, soak electrolyte
Moisten more abundant.
Further, the specific number that the multiple gradient vacuumizes is 4 times.
More preferably, the multiple gradient vacuumizes specifically: being evacuated to vacuum degree for the first time is -25KPa, pressure maintaining
Being evacuated to vacuum degree after 1-2min for the second time is -50KPa, carries out third time after pressure maintaining 1-2min and is evacuated to vacuum degree
For -70KPa, pressure maintaining 1-2min；It carries out the 4th time and is evacuated to vacuum degree to be -90KPa, pressure maintaining 1-2min.
The utility model has the advantages that a kind of electrolyte wetting method of soft bag lithium ionic cell provided by the invention, takes gradation fluid injection
The mode of pressure maintaining is vacuumized in conjunction with gradient, is respectively placed in a vacuum drying oven the soft-package battery after fluid injection, and temperature 40-85 is set
DEG C, setting vacuum degree gradient carry out gradually vacuumize pressure maintaining, slowly reduce solid-gas-liquid three phase boundary there are gas phase drag,
It prevents pressure difference excessive so as to cause the generation of pole piece deformation, and electrolyte is allowed directly to contact with pole piece, not only reduce leaching
Moisten the time；And effect of impregnation is good, lithium is not analysed at interface, and interface is good, more excellent using the cycle performance of battery of preparation.Side of the invention
Method is simple and easy, convenient and efficient, is suitable for actual production and operates, practical value is significant.
Detailed description of the invention:
Fig. 1 is the full electricity dismantling pole piece interface conditions schematic diagram of 10 circle of 1C/1C circulation of embodiment 1；
Fig. 2 is the full electricity dismantling pole piece interface conditions schematic diagram of 10 circle of 1C/1C circulation of embodiment 2；
Fig. 3 is the full electricity dismantling pole piece interface conditions schematic diagram of 10 circle of 1C/1C circulation of embodiment 5；
Fig. 4 is the full electricity dismantling pole piece interface conditions schematic diagram of 10 circle of 1C/1C circulation of embodiment 6；
Fig. 5 is the full electricity dismantling pole piece interface conditions schematic diagram of 10 circle of 1C/1C circulation of comparative example 1；
Fig. 6 be embodiment 1,2,3 and the battery room temperature 1C/1C cycle performance contrast schematic diagram of comparative example 1-4.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail:
Embodiment 1:
A kind of electrolyte wetting method of soft bag lithium ionic cell, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；Temperature is set as 40 DEG C；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 1min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 1min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 1min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 1min；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
It vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, and the pumping for repeating step (2) is true
Empty and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 40 DEG C at vacuum oven in stand 12h.
Embodiment 2:
A kind of electrolyte wetting method of soft bag lithium ionic cell, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；Temperature is set as 60 DEG C；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 1min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 1min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 1min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 1min；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
It vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, and the pumping for repeating step (2) is true
Empty and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 60 DEG C at vacuum oven in stand 8h.
Embodiment 3:
A kind of electrolyte wetting method of soft bag lithium ionic cell, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；Temperature is set as 80 DEG C；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 1min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 1min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 1min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 1min；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
It vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, and the pumping for repeating step (2) is true
Empty and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 80 DEG C at vacuum oven in stand 4h.
Embodiment 5:
A kind of electrolyte wetting method of soft bag lithium ionic cell, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；Temperature is set as 60 DEG C；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 2min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 2min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 2min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 2min；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
It vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, and the pumping for repeating step (2) is true
Empty and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 60 DEG C at vacuum oven in stand 8h.
Embodiment 6:
A kind of electrolyte wetting method of soft bag lithium ionic cell, includes the following steps:
(1) soft-package battery is taken first, and injection electrolyte appraises and decides the 1/3 of reservoir quantity to it, and it is dry to be placed in vacuum for top side open-ended
In dry case；Temperature is set as 80 DEG C；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 2min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 2min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 2min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 2min；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats step (2)
It vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, and the pumping for repeating step (2) is true
Empty and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 80 DEG C at vacuum oven in stand 4h.
Comparative example 1:
The infiltration that electrolyte is carried out using conventional method, top side is sealed as after fluid injection to the amount of appraising and deciding, and stands 6h at 25 DEG C,
It is infiltrated for 24 hours at 45 DEG C.
Comparative example 2:
Remaining embodiment is same as Example 1, and difference does not vacuumize mode using gradient in step (2),
Vacuumizing every time is -25KPa, and it is -25KPa that step (5), which is in vacuum degree, is stood in the vacuum oven at 40 DEG C
12h。
Comparative example 3:
Remaining embodiment is same as Example 1, the difference is that gradation fluid injection mode is not used, specifically: (1)
Soft-package battery is taken, electrolyte is injected to it and appraises and decides reservoir quantity, top side open-ended is placed in a vacuum drying oven；Temperature is set as 40
℃；
(2) being evacuated to vacuum degree for the first time is -25KPa, be evacuated to after pressure maintaining 1min for the second time vacuum degree be -
It carries out third time after 50KPa, pressure maintaining 1min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 1min；The 4th time is carried out to be evacuated to
Vacuum degree is -90KPa, pressure maintaining 1min；
(3) vacuum degree be -90KPa, temperature be 40 DEG C at vacuum oven in stand 12h.
Comparative example 4:
Remaining embodiment is same as Example 1, the difference is that temperature is disposed as 25 DEG C.
Performance test:
Battery core after embodiment 1-6 and comparative example 1-4 are infiltrated carries out top side seal (carrying out in drying shed), chemical conversion
Equal subsequent steps detect its chemical property, specifically as shown in Fig. 1-6 and table 1:
Wherein: Fig. 1-4 is respectively that the battery core 1C/1C room temperature prepared after the method for the embodiment of the present invention 1,2,5,6 infiltrates follows
Ring 10 encloses the interface conditions after completely filling.Fig. 5 is after the circle of battery core 1C/1C normal temperature circulation 10 prepared after comparative example 1 infiltrates completely fills
Interface conditions.
, it is apparent that occurring analysis lithium situation among the interface of comparative example 1, this is because electrolyte infiltration is not enough
Caused analysis lithium.And the battery core interface of several embodiments of the present invention has no analysis lithium situation and occurs.
In addition, table 1 is the electrochemistry of battery core prepared by the wetting method of embodiment and the different electrolyte of comparative example
The comparison of performance:
1 electric performance test Comparative result of table
The battery core and comparison that the wetting method of the embodiment of the present invention 1~6 obtains it can be seen from test result in table 1
The comparison of battery core that example 1~4 obtains, the battery core that Examples 1 to 6 obtains effectively increase coulombic efficiency for the first time, and middle section without
It analyses lithium situation to occur, capacity is also higher；Cycle performance of battery is more excellent, cycle life figure in specific visible Fig. 6；The embodiment of the present invention
The battery core of 1-6 application preparation cycle performance of battery compared with comparative example 1-4 slightly has advantage.
Claims (5)
1. a kind of electrolyte wetting method of soft bag lithium ionic cell, it is characterised in that include the following steps:
(1) soft-package battery is taken first, is injected electrolyte to it and is appraised and decided the 1/3 of reservoir quantity, top side open-ended is placed in vacuum oven
In；
(2) it carries out multiple gradient and is evacuated to vacuum degree to be pressure maintaining 1-2min after -90KPa；
(3) secondary injection electrolyte is carried out after the completion of pressure maintaining, fluid injection appraises and decides the 2/3 of reservoir quantity to it, repeats the multiple of step (2)
Gradient vacuumizes and pressure holding step；
(4) electrolyte is injected after the completion of pressure maintaining three times, fluid injection appraises and decides reservoir quantity to it, repeats the multiple gradient of step (2)
It vacuumizes and pressure holding step；
(5) vacuum degree be -90KPa, temperature be 40-85 DEG C at vacuum oven in stand 4-12h.
2. the electrolyte wetting method of soft bag lithium ionic cell according to claim 1, it is characterised in that: in step (1)
Temperature setting is 40-85 DEG C in a vacuum drying oven.
3. the electrolyte wetting method of soft bag lithium ionic cell according to claim 1, it is characterised in that: the multiple ladder
Degree vacuumizes and specially carries out the mode that gradually multiple gradient vacuumizes simultaneously pressure maintaining in the vacuum ranges of -25KPa -90KPa
It carries out.
4. the electrolyte wetting method of soft bag lithium ionic cell according to claim 1 or 3, it is characterised in that: described more
The specific number that subgradient vacuumizes is 4 times.
5. the electrolyte wetting method of soft bag lithium ionic cell according to claim 1 or 3, it is characterised in that: described more
Subgradient vacuumizes specifically: being evacuated to vacuum degree for the first time is -25KPa, is vacuumized for the second time after pressure maintaining 1-2min
It is -50KPa to vacuum degree, third time is carried out after pressure maintaining 1-2min and is evacuated to vacuum degree to be -70KPa, pressure maintaining 1-2min；It carries out
It is -90KPa, pressure maintaining 1-2min that 4th time, which is evacuated to vacuum degree,.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110247121A (en) * | 2019-06-25 | 2019-09-17 | 桑顿新能源科技有限公司 | The electrolyte wetting method of lithium ion battery and its lithium ion battery and electronic device being prepared |
| CN110828903A (en) * | 2019-11-06 | 2020-02-21 | 风帆有限责任公司 | Cell infiltration method of flexible package lithium ion battery |
| CN110854439A (en) * | 2019-09-30 | 2020-02-28 | 深圳君耀投资合伙企业(有限合伙) | Lithium ion battery assembling method and lithium ion battery |
| CN111106302A (en) * | 2019-11-25 | 2020-05-05 | 深圳市卓能新能源股份有限公司 | Cylindrical lithium ion battery and preparation method thereof |
| CN111416158A (en) * | 2020-04-26 | 2020-07-14 | 天津市捷威动力工业有限公司 | Pole piece infiltration method of soft package lithium ion battery |
| CN111584927A (en) * | 2020-05-11 | 2020-08-25 | 烯望新能源科技(深圳)有限公司 | Method for improving electro-hydraulic wettability of lithium ion battery |
| CN111769218A (en) * | 2020-07-13 | 2020-10-13 | 苏州凌威新能源科技有限公司 | Soft package battery packaging method |
| CN114777427A (en) * | 2022-05-10 | 2022-07-22 | 星恒电源股份有限公司 | Drying method of square laminated lithium ion battery cell |
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| CN111584927A (en) * | 2020-05-11 | 2020-08-25 | 烯望新能源科技(深圳)有限公司 | Method for improving electro-hydraulic wettability of lithium ion battery |
| CN111769218A (en) * | 2020-07-13 | 2020-10-13 | 苏州凌威新能源科技有限公司 | Soft package battery packaging method |
| CN114777427A (en) * | 2022-05-10 | 2022-07-22 | 星恒电源股份有限公司 | Drying method of square laminated lithium ion battery cell |
| CN114777427B (en) * | 2022-05-10 | 2023-11-17 | 星恒电源股份有限公司 | Drying method for square laminated lithium ion battery cell |
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