CN112421179A - Manufacturing method of soft package battery based on composite gel diaphragm - Google Patents
Manufacturing method of soft package battery based on composite gel diaphragm Download PDFInfo
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- CN112421179A CN112421179A CN202011177972.XA CN202011177972A CN112421179A CN 112421179 A CN112421179 A CN 112421179A CN 202011177972 A CN202011177972 A CN 202011177972A CN 112421179 A CN112421179 A CN 112421179A
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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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- 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 manufacturing method of the soft package battery based on the composite gel diaphragm comprises the following steps: s1, manufacturing a positive pole piece and a negative pole piece; s2, vacuum baking of the diaphragm: s3, manufacturing a winding core: s4, manufacturing a battery: s5, baking the battery: s6, battery post-processing; the invention adopts the polypropylene film coated with the copolymer of PVDF and HFP on the surface as the diaphragm, and carries out hot-pressing fusion on the battery core, so that the PVDF coated on the diaphragm can be fused with the pole piece into a whole, thereby avoiding the adverse phenomena of pole piece displacement and the like in the operation and operation process of the battery core, and simultaneously, the cooling and the shaping are matched, other process steps and process parameters are optimized, the sequence of the steps is in mutual correlation and cooperation with the process parameters of the steps, so that the finally prepared battery has higher hardness and energy density, the pole piece and the diaphragm are fused into a whole, the electron migration distance is reduced, the low-temperature performance can be greatly improved, and the cycle performance and the safety performance are also improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a manufacturing method of a soft package battery based on a composite gel diaphragm.
Background
Soft package lithium ion batteries have been widely used in the fields of electronic products, models, vehicles, energy storage, military and aerospace and the like due to the advantages of high voltage, high specific energy, low self-discharge rate, high safety, long service life, battery shape capable of being designed according to customer requirements and the like. Particularly, the soft package battery using the lithium iron phosphate as the positive active material has more obvious performance advantages of service life, safety and the like.
Because the material of the lithium iron phosphate is an insulator, the electronic conductivity is low, and the lithium ion diffusivity is poor, so the low-temperature performance is not ideal, and under the low-temperature environment, the viscosity of the electrolyte is increased, so the conductivity of the lithium ion battery is reduced, and the low-temperature performance of the lithium ion battery is severely restricted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for manufacturing a soft package battery based on a composite gel diaphragm, and the specific technical scheme is as follows:
the manufacturing method of the soft package battery based on the composite gel diaphragm comprises the following steps:
s1, manufacturing a positive pole piece and a negative pole piece;
s2, vacuum baking of the diaphragm:
selecting a composite gel diaphragm as a diaphragm, wherein the diaphragm is a polypropylene film coated with PVDF-HFP copolymer on the surface;
putting the diaphragm into a vacuum oven with the constant temperature of 50 +/-5 ℃, and vacuumizing the vacuum oven to-0.08 to-0.10 MPa;
baking for 3 +/-0.5 h, stopping heating, and taking out the diaphragm after the temperature is reduced to below 35 ℃;
s3, manufacturing a winding core:
overlapping the positive pole piece, the diaphragm and the negative pole piece and then winding the overlapped positive pole piece, the diaphragm and the negative pole piece into a battery cell;
placing the battery cell in a hot press for hot-pressing fusion, fusing the PVDF coated on the diaphragm and the pole piece into a whole, and hot-pressing the battery cell to form a winding core;
placing the roll core in a cold press for cold pressing, cooling and shaping;
s4, manufacturing a battery:
the winding core is subjected to tab welding and aluminum plastic film packaging to obtain a battery;
s5, baking the battery:
putting the battery into a vacuum oven, setting the temperature to be 70-90 ℃, starting baking after the vacuumizing value is-0.09 to-0.10 MPa, stopping heating after baking for 12-36 h, and taking out the battery cell after the temperature is reduced to below 35 ℃;
injecting liquid into the battery;
and S6, battery post-processing.
Further, the battery post-treatment comprises the following steps:
aging: placing the battery after liquid injection into an aging room, and aging for 24-36 h at the temperature of 35-50 ℃;
formation: placing the aged battery in a pressure formation cabinet, and performing formation charging at the temperature of 50-70 ℃;
primary high-temperature aging: placing the formed battery in a high-temperature aging room, and aging at 50-70 ℃ for 4-12 h;
secondary high-temperature aging: and (3) secondary sealing the battery subjected to primary high-temperature aging, placing the battery in a high-temperature aging room, aging at the high temperature of 35-50 ℃ for 12-36 hours, and grading the capacity to obtain the soft package lithium ion battery finished product.
Further, during formation, 2-10 kg/mm of electrolyte is added to the battery2The pressure and the pressing mode adopt any one of weight pressurization, hydraulic pressurization and spring pressurization.
Further, in S3, the hot-pressing fusion temperature of the hot-pressing machine is 60-90 ℃, and the pressure is 10-30 kg/mm2。
Further, in S3, the cold pressing temperature of the cold press is room temperature, and the cold pressing pressure is 2-10 kg/mm2And the cold pressing time is 2-8 min.
Further, in S1, the positive electrode active material, the conductive agent and the binder are mixed to form a positive electrode slurry, and the slurry is continuously and uniformly coated on the aluminum foil, and dried, rolled and cut to obtain the positive electrode sheet.
Further, in S1, the negative electrode active material, the conductive agent and the binder are mixed to form a negative electrode slurry, and the slurry is continuously and uniformly coated on the copper foil, and dried, rolled and cut to obtain the negative electrode sheet.
The invention has the beneficial effects that: adopt the polypropylene film of surface coating PVDF and HFP copolymer as the diaphragm, and carry out hot pressing to electric core and fuse, the PVDF who makes coating above the diaphragm can be fused into an organic whole with the pole piece, thereby make electric core avoid appearing unfavorable phenomena such as pole piece aversion in the operation in-process, here cooperate the cooling design simultaneously, and other process steps and process parameter have optimized, the order of each step is in coordination with the process parameter of each step is correlated with each other, make the battery hardness and the energy density that finally make higher, the pole piece fuses into an organic whole with the diaphragm, the electron migration distance reduces, can improve low temperature performance by a wide margin, cycle performance and security performance also obtain promoting.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for manufacturing a soft package battery based on a composite gel diaphragm,
example 1
(1) Manufacturing a positive pole piece: preparing a positive electrode slurry from a positive electrode active material, a conductive agent and a binder according to a required proportion, continuously and uniformly coating the positive electrode slurry on an aluminum foil, and drying, rolling and slitting the aluminum foil to obtain a positive electrode plate;
(2) manufacturing a negative pole piece: preparing a negative electrode slurry from a negative electrode active material, a conductive agent and a binder according to a required ratio, continuously and uniformly coating the negative electrode slurry on copper foil, and drying, rolling and slitting to obtain a negative electrode plate;
(3) and (3) vacuum baking of a diaphragm: selecting a composite gel diaphragm as a diaphragm, coating a polypropylene film of PVDF (vinylidene fluoride) and HFP (hexafluoropropylene) copolymer on the surface of the composite gel diaphragm, putting the diaphragm into a vacuum oven with the constant temperature of 45 ℃, vacuumizing to-0.08 MPa, baking for 2.5h, stopping heating, and taking out the diaphragm after the temperature is reduced to below 35 ℃;
(4) manufacturing an electric core: overlapping the positive pole piece, the diaphragm and the negative pole piece and then winding the overlapped positive pole piece, the diaphragm and the negative pole piece into a battery cell;
(5) hot-pressing fusion: placing the battery cell in a hot press for hot-pressing fusion, wherein the hot-pressing fusion temperature is 60 ℃, and the pressure is 10kg/mm2；
(6) Cooling and shaping: placing the winding core in the step (5) in a cold press for cold pressing, cooling and shaping, wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 2kg/mm2The cold pressing time is 2 min;
(7) manufacturing a battery: welding the pole lugs of the winding core obtained in the step (6) and packaging the winding core by an aluminum plastic film to obtain a battery;
(8) baking the battery: placing the battery into a vacuum oven, setting the temperature at 70 ℃, starting baking after the vacuumizing value reaches-0.09 MPa, stopping heating after baking for 12h, taking out the battery core after the temperature is reduced to below 35 ℃, and injecting liquid into the battery;
(9) aging: placing the battery after liquid injection into an aging room, and aging for 24 hours at the temperature of 35 ℃;
(10) formation: placing the aged battery in a pressure formation cabinet, and applying 2kg/mm to the battery by weight pressurization, hydraulic pressurization or spring pressurization2Pressure, formation charging at 50 deg.C;
(11) primary high-temperature aging: placing the formed battery in a high-temperature aging room, and aging at 50 ℃ for 4 h;
(12) secondary high-temperature aging: and (4) secondary sealing the battery in the step (11), placing the battery in a high-temperature aging room, aging the battery at the high temperature of 35 ℃ for 12 hours, and grading the battery according to the volume to obtain the soft package lithium ion battery finished product.
Example 2
(1) Manufacturing a positive pole piece: preparing a positive electrode slurry from a positive electrode active material, a conductive agent and a binder according to a required proportion, continuously and uniformly coating the positive electrode slurry on an aluminum foil, and drying, rolling and slitting the aluminum foil to obtain a positive electrode plate;
(2) manufacturing a negative pole piece: preparing a negative electrode slurry from a negative electrode active material, a conductive agent and a binder according to a required ratio, continuously and uniformly coating the negative electrode slurry on copper foil, and drying, rolling and slitting to obtain a negative electrode plate;
(3) and (3) vacuum baking of a diaphragm: selecting a composite gel diaphragm as a diaphragm, wherein the composite gel diaphragm is a polypropylene film coated with PVDF and HFP copolymer on the surface, putting the diaphragm into a vacuum oven with the constant temperature of 55 ℃, vacuumizing to-0.10 MPa, baking for 3.5h, stopping heating, and taking out the diaphragm after the temperature is reduced to below 35 ℃;
(4) manufacturing an electric core: overlapping the positive pole piece, the diaphragm and the negative pole piece and then winding the overlapped positive pole piece, the diaphragm and the negative pole piece into a battery cell;
(5) hot-pressing fusion: placing the battery cell in a hot press for hot-pressing fusion, wherein the hot-pressing fusion temperature is 90 ℃, and the pressure is 30kg/mm2；
(6) Cooling and shaping: placing the winding core in the step (5) in a cold press for cold pressing, cooling and shaping, wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 10kg/mm2The cold pressing time is 8 min;
(7) manufacturing a battery: welding the pole lugs of the winding core obtained in the step (6) and packaging the winding core by an aluminum plastic film to obtain a battery;
(8) baking the battery: placing the battery into a vacuum oven, setting the temperature to be 90 ℃, starting baking after the vacuumizing value reaches-0.10 MPa, stopping heating after baking for 36h, taking out the battery core after the temperature is reduced to be below 35 ℃, and injecting liquid into the battery;
(9) aging: putting the battery after liquid injection into an aging room, and aging for 36 hours at the temperature of 50 ℃;
(10) formation: placing the aged battery in a pressure formation cabinet, and applying 10kg/mm to the battery by weight pressurization, hydraulic pressurization or spring pressurization2Pressure, formation charging at 70 deg.C;
(11) primary high-temperature aging: placing the formed battery in a high-temperature aging room, and aging at 70 ℃ for 12 h;
(12) secondary high-temperature aging: and (4) secondary sealing the battery in the step (11), placing the battery in a high-temperature aging room, aging the battery at the temperature of 50 ℃ for 36 hours, and grading the battery according to the volume to obtain the soft package lithium ion battery finished product.
Example 3
(1) Manufacturing a positive pole piece: preparing a positive electrode slurry from a positive electrode active material, a conductive agent and a binder according to a required proportion, continuously and uniformly coating the positive electrode slurry on an aluminum foil, and drying, rolling and slitting the aluminum foil to obtain a positive electrode plate;
(2) manufacturing a negative pole piece: preparing a negative electrode slurry from a negative electrode active material, a conductive agent and a binder according to a required ratio, continuously and uniformly coating the negative electrode slurry on copper foil, and drying, rolling and slitting to obtain a negative electrode plate;
(3) and (3) vacuum baking of a diaphragm: selecting a composite gel diaphragm as a diaphragm, wherein the composite gel diaphragm is a polypropylene film coated with PVDF and HFP copolymer on the surface, putting the diaphragm into a vacuum oven with the constant temperature of 50 ℃, vacuumizing to-0.09 MPa, baking for 3h, stopping heating, and taking out the diaphragm after the temperature is reduced to below 35 ℃;
(4) manufacturing an electric core: overlapping the positive pole piece, the diaphragm and the negative pole piece and then winding the overlapped positive pole piece, the diaphragm and the negative pole piece into a battery cell;
(5) hot-pressing fusion: placing the battery cell in a hot press for hot-pressing fusion, wherein the hot-pressing fusion temperature is 70 ℃, and the pressure is 20kg/mm2；
(6) Cooling and shaping: placing the winding core in the step (5) in a cold press for cold pressing, cooling and shaping, wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 8kg/mm2The cold pressing time is 6 min;
(7) manufacturing a battery: welding the pole lugs of the winding core obtained in the step (6) and packaging the winding core by an aluminum plastic film to obtain a battery;
(8) baking the battery: placing the battery into a vacuum oven, setting the temperature to 80 ℃, starting baking after the vacuumizing value reaches-0.095 MPa, stopping heating after baking for 24h, taking out the battery core after the temperature is reduced to below 35 ℃, and injecting liquid into the battery;
(9) aging: placing the battery after liquid injection into an aging room, and aging for 30 hours at the temperature of 40 ℃;
(10) formation: placing the aged battery in a pressure formation cabinet, and applying 8kg/mm to the battery by means of weight pressurization, hydraulic pressurization or spring pressurization2Pressure, formation charging at 60 deg.C;
(11) primary high-temperature aging: placing the formed battery in a high-temperature aging room, and aging at 60 ℃ for 8 h;
(12) secondary high-temperature aging: and (4) secondary sealing the battery in the step (11), placing the battery in a high-temperature aging room, aging the battery at the temperature of 40 ℃ for 24 hours, and grading the battery according to the volume to obtain the soft package lithium ion battery finished product.
The method has simple process steps and strong operability, the prepared battery has high hardness, the capacity retention rate of the battery prepared by the three embodiments is still 80-85% after the battery is subjected to charge-discharge cycling for 1200 times at 0.5C, and the needle puncture, overcharge and extrusion pass rates of the three batteries are all 100% in safety tests.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized by comprising the following steps: the preparation method comprises the following steps:
s1, manufacturing a positive pole piece and a negative pole piece;
s2, vacuum baking of the diaphragm:
selecting a composite gel diaphragm as a diaphragm, wherein the diaphragm is a polypropylene film coated with PVDF-HFP copolymer on the surface;
putting the diaphragm into a vacuum oven with the constant temperature of 50 +/-5 ℃, and vacuumizing the vacuum oven to-0.08 to-0.10 MPa;
baking for 3 +/-0.5 h, stopping heating, and taking out the diaphragm after the temperature is reduced to below 35 ℃;
s3, manufacturing a winding core:
overlapping the positive pole piece, the diaphragm and the negative pole piece and then winding the overlapped positive pole piece, the diaphragm and the negative pole piece into a battery cell;
placing the battery cell in a hot press for hot-pressing fusion, fusing the PVDF coated on the diaphragm and the pole piece into a whole, and hot-pressing the battery cell to form a winding core;
placing the roll core in a cold press for cold pressing, cooling and shaping;
s4, manufacturing a battery:
the winding core is subjected to tab welding and aluminum plastic film packaging to obtain a battery;
s5, baking the battery:
putting the battery into a vacuum oven, setting the temperature to be 70-90 ℃, starting baking after the vacuumizing value is-0.09 to-0.10 MPa, stopping heating after baking for 12-36 h, and taking out the battery cell after the temperature is reduced to below 35 ℃;
injecting liquid into the battery;
and S6, battery post-processing.
2. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: the battery post-treatment comprises the following steps:
aging: placing the battery after liquid injection into an aging room, and aging for 24-36 h at the temperature of 35-50 ℃;
formation: placing the aged battery in a pressure formation cabinet, and performing formation charging at the temperature of 50-70 ℃;
primary high-temperature aging: placing the formed battery in a high-temperature aging room, and aging at 50-70 ℃ for 4-12 h;
secondary high-temperature aging: and (3) secondary sealing the battery subjected to primary high-temperature aging, placing the battery in a high-temperature aging room, aging at the high temperature of 35-50 ℃ for 12-36 hours, and grading the capacity to obtain the soft package lithium ion battery finished product.
3. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: during formation, 2-10 kg/mm of the electrolyte is added to the battery2The pressure and the pressing mode adopt any one of weight pressurization, hydraulic pressurization and spring pressurization.
4. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: in S3, the hot pressing fusion temperature of the hot pressing machine is 60-90 ℃, and the pressure is 10-30 kg/mm2。
5. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: in thatS3, the cold pressing temperature of the cold press is room temperature, and the cold pressing pressure is 2-10 kg/mm2And the cold pressing time is 2-8 min.
6. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: in S1, the positive electrode active material, the conductive agent and the binder are prepared into positive electrode slurry according to the required proportion, and the positive electrode slurry is continuously and uniformly coated on the aluminum foil, and the positive electrode plate is obtained after drying, rolling and slitting.
7. The manufacturing method of the soft package battery based on the composite gel diaphragm is characterized in that: in S1, preparing a negative electrode slurry from the negative electrode active material, the conductive agent and the binder according to the required proportion, continuously and uniformly coating the negative electrode slurry on a copper foil, and drying, rolling and slitting to obtain the negative electrode plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115117550A (en) * | 2022-06-06 | 2022-09-27 | 惠州亿纬锂能股份有限公司 | Separator type selection method for soft-package battery cell and production process of soft-package battery cell |
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| CN106486703A (en) * | 2016-11-02 | 2017-03-08 | 浙江超威创元实业有限公司 | A kind of soft bag lithium ionic cell manufacture method of use pluralgel barrier film |
| CN110739491A (en) * | 2019-10-12 | 2020-01-31 | 桑顿新能源科技(长沙)有限公司 | method for manufacturing soft-package lithium battery by using gluing diaphragm |
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Patent Citations (3)
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| CN103996877A (en) * | 2013-11-26 | 2014-08-20 | 深圳市星源材质科技股份有限公司 | Method for processing lithium ion battery cell by diaphragm coating |
| CN106486703A (en) * | 2016-11-02 | 2017-03-08 | 浙江超威创元实业有限公司 | A kind of soft bag lithium ionic cell manufacture method of use pluralgel barrier film |
| CN110739491A (en) * | 2019-10-12 | 2020-01-31 | 桑顿新能源科技(长沙)有限公司 | method for manufacturing soft-package lithium battery by using gluing diaphragm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115117550A (en) * | 2022-06-06 | 2022-09-27 | 惠州亿纬锂能股份有限公司 | Separator type selection method for soft-package battery cell and production process of soft-package battery cell |
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