CN112820945A - Method for improving liquid retention coefficient of polymer lithium ion battery - Google Patents
Method for improving liquid retention coefficient of polymer lithium ion battery Download PDFInfo
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- CN112820945A CN112820945A CN202110062380.1A CN202110062380A CN112820945A CN 112820945 A CN112820945 A CN 112820945A CN 202110062380 A CN202110062380 A CN 202110062380A CN 112820945 A CN112820945 A CN 112820945A
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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 invention discloses a mode for improving the liquid retention coefficient of a polymer lithium ion battery, which relates to the technical field of lithium ion batteries and comprises the following steps: s1, setting the working temperature of the equipment to be 60 ℃, S2 the surface pressure of the equipment, carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient lifting, S3 constant-current charging, carrying out constant-current charging operation on the lithium ion battery in the S2 step, sorting in the S4 direction, and uniformly sorting the battery air bags upwards on the lithium ion battery after the completion of the S3 step. The invention has the beneficial effects that: according to the invention, through setting three times of equipment surface pressure, three times of constant current charging, two times of direction arrangement and two times of liquid return, and through the adjustment of the high-temperature pressure formation process step, the internal liquid retention capacity of the battery can be improved by 5% -10%, the finished product thickness, appearance and hardness of the battery can also be ensured, the overall cyclic service performance of the battery can be greatly about 20%, and the overall safety performance of the battery can be effectively improved along with the improvement of the liquid retention capacity.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a mode for improving the liquid retention coefficient of a polymer lithium ion battery.
Background
At present, polymer lithium ion batteries with high specific capacity and excellent cycle performance are the key points in the research of the digital field of the polymer lithium ion batteries. The battery has the advantages that the battery tends to be stable gradually in the aspects of equipment, materials, process design and the like required by the current battery manufacturing, and the space for improving the cycle performance of the battery is smaller and smaller through equipment precision, material performance improvement, process design optimization and the like, so that the improvement of the liquid retention capacity of the battery is of great importance to the improvement of the cycle performance of the battery.
At present, the conventional liquid retention mode of the battery is generally as follows: liquid injection → normal temperature and high temperature standing → formation → normal temperature/high temperature standing → secondary sealing, the liquid retention performance of the battery mainly depends on the liquid absorption performance of the positive and negative electrode plates and the diaphragm, but in the formation process of continuous high temperature, high pressure and large current, the liquid absorption and retention of the positive and negative electrodes and the diaphragm can be influenced to a certain extent, therefore, a mode for improving the liquid retention coefficient of the polymer lithium ion battery is provided, and the cycle performance of the battery is very necessary to be improved. Aiming at the defects of the prior art, the invention provides a mode for improving the liquid retention coefficient of a polymer lithium ion battery, and the mode can effectively improve/improve the retention amount of electrolyte in the battery by adjusting the process step in the high-temperature pressure formation process so as to improve the cycle performance and the safety performance of the battery.
Disclosure of Invention
The present invention aims to provide a method for improving the liquid retention coefficient of a polymer lithium ion battery, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving the liquid retention coefficient of a polymer lithium ion battery comprises the following steps:
s1, setting temperature: setting the working temperature of the equipment to be 60 ℃;
s2, equipment surface pressure: carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement;
s3, constant current charging: performing constant-current charging operation on the lithium ion battery in the step S2;
s4, direction arrangement: uniformly arranging the battery air bags upwards in the lithium ion battery finished in the step S3;
s5, liquid return: performing liquid returning operation on the lithium ion battery finished in the step S4;
s6, standing in a lower cabinet: and (5) discharging the lithium ion battery after the liquid returning operation in the step (S5) is completed, and performing secondary sealing after the discharging is completed.
Preferably, the step S2 includes a first surface pressure, a second surface pressure and a third surface pressure.
Preferably, the primary face pressure time is 35min, the secondary face pressure time is 65min, and the tertiary face pressure time is 65 min.
Preferably, the primary surface pressure is 1.5kg · f/cm2The secondary surface pressure is 4kg · f/cm2The third surface pressure is 7-9 kg.f/cm2。
Preferably, the step S3 of constant current charging includes primary charging, secondary charging and tertiary charging.
Preferably, the primary charging value is 0.1C, the constant current charging is performed to 4.2V, the secondary charging value is 0.2C, the constant current charging is performed to 4.2V, the tertiary charging value is 0.45C, and the constant current charging is performed to 4.2V.
Preferably, the primary charging time is 30min, the secondary charging time is 60min, and the tertiary charging time is 60 min.
Preferably, the step S4 directional arrangement includes a primary arrangement and a secondary arrangement.
Preferably, the liquid returning in the step S5 includes a primary liquid returning and a secondary liquid returning, and the standing time of the primary liquid returning and the standing time of the secondary liquid returning are both 30 min.
Preferably, the lower cabinet standing time of the step S6 is 30 min.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through setting three times of equipment surface pressure, three times of constant current charging, two times of direction arrangement and two times of liquid return, and through the adjustment of the high-temperature pressure formation process step, the internal liquid retention capacity of the battery can be improved by 5% -10%, the finished product thickness, appearance and hardness of the battery can also be ensured, the overall cyclic service performance of the battery can be greatly about 20%, and the overall safety performance of the battery can be effectively improved along with the improvement of the liquid retention capacity.
Drawings
FIG. 1 is a flow chart of the mode of operation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
the first embodiment is as follows:
a method for improving the liquid retention coefficient of a polymer lithium ion battery comprises the following steps:
s1, setting temperature: setting the working temperature of the equipment to be 60 ℃;
s2, equipment surface pressure: carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement;
s3, constant current charging: performing constant-current charging operation on the lithium ion battery in the step S2;
s4, direction arrangement: uniformly arranging the battery air bags upwards in the lithium ion battery finished in the step S3;
s5, liquid return: and (6) performing liquid returning operation on the lithium ion battery after the step of S4 is completed.
Wherein, the step S2 includes the equipment surface pressure including the primary surface pressure, the secondary surface pressure and the tertiary surface pressure.
Wherein the primary face pressure time is 35min, the secondary face pressure time is 65min, and the tertiary face pressure time is 65 min.
Wherein the primary surface pressure is 1.5kg · f/cm2The secondary surface pressure is 4kg · f/cm2The third surface pressure is 7-9 kg.f/cm2。
Wherein, the step S3 constant current charging includes primary charging, secondary charging and tertiary charging.
The primary charging value is 0.1C, the constant current charging is carried out to 4.2V, the secondary charging value is 0.2C, the constant current charging is carried out to 4.2V, the tertiary charging value is 0.45C, and the constant current charging is carried out to 4.2V.
The primary charging time is 30min, the secondary charging time is 60min, and the tertiary charging time is 60 min.
Wherein, the step S4 direction arrangement comprises primary arrangement and secondary arrangement.
And S5, returning the liquid, including primary returning liquid and secondary returning liquid, for 30 min.
The specific implementation mode is as follows: setting the temperature of the equipment, and setting the working temperature of the equipment to be 60 ℃; carrying out primary equipment surface pressure, and carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement, wherein the surface pressure value is 1.5 kg; performing primary constant current charging, performing primary charging operation on the lithium ion battery, wherein the value is 0.1C, performing constant current charging to 4.2V, and limiting the time for 30 min; performing one-time directional arrangement, namely uniformly arranging the battery air bags upwards before the lithium ion battery process is finished; and (4) carrying out primary liquid return, loosening the formation clamp, carrying out primary liquid return operation in the formation process, and standing for 30 min.
Example two:
on the basis of the first embodiment, a method for improving the liquid retention coefficient of a polymer lithium ion battery comprises the following steps:
s1, setting temperature: setting the working temperature of the equipment to be 60 ℃;
s2, equipment surface pressure: carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement;
s3, constant current charging: performing constant-current charging operation on the lithium ion battery in the step S2;
s4, direction arrangement: uniformly arranging the battery air bags upwards in the lithium ion battery finished in the step S3;
s5, liquid return: and (6) performing liquid returning operation on the lithium ion battery after the step of S4 is completed.
Wherein, the step S2 includes the equipment surface pressure including the primary surface pressure, the secondary surface pressure and the tertiary surface pressure.
Wherein the primary face pressure time is 35min, the secondary face pressure time is 65min, and the tertiary face pressure time is 65 min.
Wherein the primary surface pressure is 1.5kg · f/cm2The secondary surface pressure is 4kg · f/cm2The third surface pressure is 7-9 kg.f/cm2。
Wherein, the step S3 constant current charging includes primary charging, secondary charging and tertiary charging.
The primary charging value is 0.1C, the constant current charging is carried out to 4.2V, the secondary charging value is 0.2C, the constant current charging is carried out to 4.2V, the tertiary charging value is 0.45C, and the constant current charging is carried out to 4.2V.
The primary charging time is 30min, the secondary charging time is 60min, and the tertiary charging time is 60 min.
Wherein, the step S4 direction arrangement comprises primary arrangement and secondary arrangement.
And S5, returning the liquid, including primary returning liquid and secondary returning liquid, for 30 min.
The specific implementation mode is as follows: carrying out secondary equipment surface pressure, and carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement, wherein the surface pressure value is 4 kg; performing secondary constant current charging, performing secondary charging operation on the lithium ion battery, wherein the value is 0.2C, and performing constant current charging to 4.2V, and the time is limited to 60 min; performing secondary directional arrangement, and uniformly arranging the battery air bags upwards before the lithium ion battery process is finished; and (4) carrying out secondary liquid return, loosening the formation clamp, carrying out primary liquid return operation in the formation process, and standing for 30 min.
Example three:
on the basis of the second embodiment, a method for improving the liquid retention coefficient of a polymer lithium ion battery comprises the following steps:
s1, setting temperature: setting the working temperature of the equipment to be 60 ℃;
s2, equipment surface pressure: carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement;
s3, constant current charging: performing constant-current charging operation on the lithium ion battery in the step S2;
s4, direction arrangement: uniformly arranging the battery air bags upwards in the lithium ion battery finished in the step S3;
s5, liquid return: performing liquid returning operation on the lithium ion battery finished in the step S4;
s6, standing in a lower cabinet: and (5) discharging the lithium ion battery after the liquid returning operation in the step (S5) is completed, and performing secondary sealing after the discharging is completed.
Wherein, the step S2 includes the equipment surface pressure including the primary surface pressure, the secondary surface pressure and the tertiary surface pressure.
Wherein the primary face pressure time is 35min, the secondary face pressure time is 65min, and the tertiary face pressure time is 65 min.
Wherein the primary surface pressure is 1.5kg · f/cm2The secondary surface pressure is 4kg · f/cm2The third surface pressure is 7-9 kg.f/cm2。
Wherein, the step S3 constant current charging includes primary charging, secondary charging and tertiary charging.
The primary charging value is 0.1C, the constant current charging is carried out to 4.2V, the secondary charging value is 0.2C, the constant current charging is carried out to 4.2V, the tertiary charging value is 0.45C, and the constant current charging is carried out to 4.2V.
The primary charging time is 30min, the secondary charging time is 60min, and the tertiary charging time is 60 min.
Wherein, the step S4 direction arrangement comprises primary arrangement and secondary arrangement.
And S5, returning the liquid, including primary returning liquid and secondary returning liquid, for 30 min.
And in the step S6, the lower cabinet standing time is 30 min.
The specific implementation mode is as follows: carrying out surface pressure on the equipment for three times, and carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement, wherein the surface pressure value is 7-9 kg; performing secondary constant current charging, performing secondary charging operation on the lithium ion battery, wherein the value is 0.45C, and performing constant current charging to 4.2V, and the time is limited to 60 min; performing secondary directional arrangement, and uniformly arranging the battery air bags upwards before the lithium ion battery process is finished; carrying out secondary liquid return, loosening the formation clamp, carrying out primary liquid return operation in the formation process, and standing for 30 min; and (5) standing in a lower cabinet, standing for 30min after the steps are finished, and then starting to seal again.
Specifically, when the battery is used, three times of equipment surface pressure, three times of constant-current charging, two times of direction arrangement and two times of liquid return are arranged, and the high-temperature pressure formation step is adopted for adjustment, so that the internal liquid retention capacity of the battery can be improved by 5% -10%, the finished product thickness, appearance and hardness of the battery can be ensured, the overall recycling performance of the battery can be greatly about 20%, and the overall safety performance of the battery can be effectively improved along with the improvement of the liquid retention capacity.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A mode for improving the liquid retention coefficient of a polymer lithium ion battery is characterized in that: the method comprises the following steps:
s1, setting temperature: setting the working temperature of the equipment to be 60 ℃;
s2, equipment surface pressure: carrying out surface pressure operation on the lithium ion battery needing to be subjected to liquid retention coefficient improvement;
s3, constant current charging: performing constant-current charging operation on the lithium ion battery in the step S2;
s4, direction arrangement: uniformly arranging the battery air bags upwards in the lithium ion battery finished in the step S3;
s5, liquid return: performing liquid returning operation on the lithium ion battery finished in the step S4;
s6, standing in a lower cabinet: and (5) discharging the lithium ion battery after the liquid returning operation in the step (S5) is completed, and performing secondary sealing after the discharging is completed.
2. The method of claim 1, wherein the method comprises the following steps: the step S2 includes the equipment surface pressure comprises a primary surface pressure, a secondary surface pressure and a tertiary surface pressure.
3. The method of claim 2, wherein the method comprises the following steps: the primary face pressure time is 35min, the secondary face pressure time is 65min, and the tertiary face pressure time is 65 min.
4. The method of claim 2, wherein the method comprises the following steps: the primary surface pressure is 1.5 kg.f/cm2The secondary surface pressure is 4kg · f/cm2The third surface pressure is 7-9 kg.f/cm2。
5. The method of claim 1, wherein the method comprises the following steps: the step S3 constant current charging includes primary charging, secondary charging, and tertiary charging.
6. The method of claim 5, wherein the method comprises the following steps: the primary charging value is 0.1C, the constant current charging is carried out until 4.2V, the secondary charging value is 0.2C, the constant current charging is carried out until 4.2V, the tertiary charging value is 0.45C, and the constant current charging is carried out until 4.2V.
7. The method of claim 5, wherein the method comprises the following steps: the primary charging time is 30min, the secondary charging time is 60min, and the tertiary charging time is 60 min.
8. The method of claim 1, wherein the method comprises the following steps: the step S4 direction arrangement comprises primary arrangement and secondary arrangement.
9. The method of claim 1, wherein the method comprises the following steps: the liquid returning in the step S5 comprises primary liquid returning and secondary liquid returning, and the standing time of the primary liquid returning and the secondary liquid returning is 30 min.
10. The method of claim 1, wherein the method comprises the following steps: and in the step S6, the standing time of the lower cabinet is 30 min.
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| CN202110062380.1A CN112820945A (en) | 2021-01-18 | 2021-01-18 | Method for improving liquid retention coefficient of polymer lithium ion battery |
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Citations (4)
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| CN109560337A (en) * | 2018-10-15 | 2019-04-02 | 福建冠城瑞闽新能源科技有限公司 | A kind of chemical synthesizing method of lithium ion battery |
| CN110994037A (en) * | 2019-12-30 | 2020-04-10 | 山东聚信新能源科技有限公司 | Full-voltage formation method and equipment for flexible package lithium ion battery |
| CN111934019A (en) * | 2020-06-29 | 2020-11-13 | 宁波新思创机电科技股份有限公司 | Rapid formation method of power soft-package polymer lithium ion battery |
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- 2021-01-18 CN CN202110062380.1A patent/CN112820945A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633473A (en) * | 2015-12-31 | 2016-06-01 | 天津市捷威动力工业有限公司 | Method for controlling liquid preserving capability consistency of soft package lithium titanate lithium-ion battery |
| CN109560337A (en) * | 2018-10-15 | 2019-04-02 | 福建冠城瑞闽新能源科技有限公司 | A kind of chemical synthesizing method of lithium ion battery |
| CN110994037A (en) * | 2019-12-30 | 2020-04-10 | 山东聚信新能源科技有限公司 | Full-voltage formation method and equipment for flexible package lithium ion battery |
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Application publication date: 20210518 |