CN112838280A - Formation process of flexible-package polymer thin lithium ion battery - Google Patents

Formation process of flexible-package polymer thin lithium ion battery Download PDF

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CN112838280A
CN112838280A CN201911160867.2A CN201911160867A CN112838280A CN 112838280 A CN112838280 A CN 112838280A CN 201911160867 A CN201911160867 A CN 201911160867A CN 112838280 A CN112838280 A CN 112838280A
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temperature
battery cell
formation
lithium ion
battery
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周军
刘小虹
李国敏
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Shenzhen Grand Powersource Co ltd
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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
    • 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
    • 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
    • H01M10/443—Methods for charging or discharging in response to temperature
    • 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
    • H01M10/448—End of discharge regulating measures
    • 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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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a formation process of a flexible package polymer thin lithium ion battery, which comprises the following steps: the method comprises the steps of high-temperature shelving before formation, hot pressing before formation, high-temperature clamp formation, hot pressing after formation, high-temperature shelving after formation and the like, wherein a double-coated diaphragm with strong electrolyte retention capacity is selected as an isolating film of a positive pole piece and a negative pole piece, and a conductive agent combination SP + KS-6 with strong electrolyte retention capacity is selected as a conductive agent of a positive pole. The formation process of the flexible package polymer thin lithium ion battery can greatly improve the liquid retention of the battery cell and improve the cycle performance of the thin battery cell while ensuring the sufficient hardness of the thin battery cell.

Description

Formation process of flexible-package polymer thin lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a formation process of a flexible package polymer thin type lithium ion battery.
Background
With the development of market demand, the demand of more and more customers for energy density of lithium ion batteries is further increased, and therefore, many flexible-package polymer thin lithium ion batteries with high energy density are appeared, and the thin lithium ion batteries are required to have enough hardness and good cycle performance. The conventional battery core manufactured by the formation process is easy to have the conditions of enough hardness but insufficient liquid retention and poor cycle performance, or the battery core manufactured by the conventional formation process has the conditions of enough liquid retention but insufficient hardness, and cannot well meet the requirements of customers.
Disclosure of Invention
In order to overcome the defect that the conventional formation process can not ensure that the flexible package polymer thin lithium ion battery has enough hardness and enough liquid retention to ensure the cycle performance, the invention provides the formation process of the flexible package polymer thin lithium ion battery, which can ensure that the flexible package polymer thin lithium ion battery has enough hardness and enough liquid retention to ensure good cycle performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a formation process of a flexible package polymer thin lithium ion battery comprises the following steps:
s1: after the battery core is subjected to liquid injection, placing the air bag upwards at high temperature for 6-24 hours at 40-65 ℃;
s2: carrying out high-temperature hot pressing on the battery cell subjected to S1 on a high-temperature clamp formation cabinet before formation, wherein the temperature is 60-90 ℃, the surface pressure born by the battery cell is 0.50-1.00 MPa, and the time is 60-180 min;
s3: carrying out high-temperature clamp formation on the battery cell subjected to S2 on a high-temperature clamp formation cabinet, wherein the temperature is 45-80 ℃, the surface pressure borne by the battery cell is 0.50-0.90 MPa, the battery cell is charged to 4.00-4.20V by a current less than 0.5C, the upper limit voltage is 4.20V, and the charging time is 60-240 min;
s4: carrying out high-temperature hot pressing on the battery cell subjected to S3 on a high-temperature clamp formation cabinet, wherein the temperature is 60-90 ℃, the surface pressure born by the battery cell is 0.50-1.00 MPa, and the time is 60-180 min;
s5: placing the battery cell airbag subjected to S4 at a high temperature of 45-75 ℃ for 4-24 h while keeping the battery cell airbag facing upwards;
s6: and (5) upwards cooling the cell airbag which finishes the S5 to 25 +/-5 ℃, and standing for 6-38 hours at the temperature of 25 +/-5 ℃.
Furthermore, the thickness of the flexible package polymer thin lithium ion battery is 1.0-5.5 mm.
Further, the positive active material of the thin lithium ion battery is lithium cobaltate, and the positive formula comprises the following components in percentage by weight: 95-97% of lithium cobaltate, 1.6-2.2% of SP, 0.4-1.1% of KS-6, 1.4-2.2% of PVDF and 3.85-4.15 g/cm of positive electrode compaction3(ii) a The negative active material is artificial graphite, and the components and the proportion thereof in the negative formulaComprises the following steps: 94-96% of artificial graphite, 1.0-1.3% of SP, 1.5-1.8% of CMC, 1.8-2.5% of SBR and 1.50-1.72 g/cm of compacted negative electrode3(ii) a The isolating membrane is a diaphragm with double-sided coating, the substrate membrane is a PE membrane, the thickness of the substrate membrane is 8-15 mu m, one side of the substrate membrane is coated with an alumina ceramic material, the thickness of the alumina ceramic material is 1-5 mu m, and the substrate membrane is contacted with the negative plate when being wound or laminated; coating a 2-5 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is a high-temperature electrolyte matched with the electrolyte.
The invention has the beneficial effects that: the double-sided coating diaphragm is selected as an isolating membrane between the positive plate and the negative plate, the alumina and PVDF materials in the coating can absorb and hold a large amount of electrolyte, especially the alumina ceramic layer in contact with the negative plate can hold and provide sufficient electrolyte for the surface of the negative graphite, the consistency of the current density in the battery core is improved, the possibility of lithium precipitation on the surface of the negative electrode is reduced, and the cycle performance of the battery is improved; the positive electrode formula adopts the combination of SP and KS-6 conductive agents with large specific surface area and strong liquid retention capacity, so that the liquid retention capacity of the battery cell can be improved; the high-temperature shelf before formation can promote the electrolyte to fully soak the anode plate, the cathode plate and the isolating membrane, and is beneficial to increasing the liquid retention and generating a stable SEI membrane during formation; the high-temperature hot pressing before formation, the high-temperature clamp formation and the high-temperature hot pressing after formation can greatly increase the hardness of the flexible packaging polymer thin lithium ion battery and generate a stable SEI film; the high-temperature placement after formation can promote the backflow of the electrolyte and fully infiltrate the positive and negative plates and the diaphragm, thereby reducing the liquid loss during air extraction. The formation process can ensure that the flexible package polymer thin lithium ion battery has enough hardness and enough liquid retention capacity to ensure the cycle performance of the battery.
Drawings
FIG. 1 is a graph comparing the average electrolyte retention of 3250120-3300 cells in examples 1-3 of the present invention with that in comparative examples 1-2.
Fig. 2 is a diagram illustrating the retention of the cycling capacity of 3250120-3300 cells in example 1 of the present invention.
Fig. 3 is a diagram illustrating the retention of the cycling capacity of 3250120-3300 cells in example 2 of the present invention.
Fig. 4 is a graph illustrating the retention of the cycling capacity of 3250120-3300 cells in example 3 of the present invention.
Fig. 5 is a graph of the retention of the cycling capacity of the 3250120-3300 cell described in comparative example 1 of the present invention.
Fig. 6 is a graph of the retention of the cycling capacity of the 3250120-3300 cell described in comparative example 2 of the present invention.
Detailed Description
The present invention is further described with reference to specific embodiments, which are intended to be exemplary and illustrative only and should not be construed as limiting the scope of the invention in any way.
Example 1:
the soft package polymer thin lithium ion battery with the model number of 3250120-3300 adopts 4.35V lithium cobalt oxide as the positive electrode active material, and the positive electrode formula is lithium cobalt oxide: SP: KS-6: PVDF = 95.6: 1.8: 0.6: 2.0, the positive electrode compaction is 4.05-4.10 g/cm3(ii) a The negative active material adopts artificial graphite, and the negative formula is artificial graphite: SP: CMC: SBR = 95.1: 1.1: 1.6: 2.2, the compaction of the negative electrode is 1.60-1.65 g/cm3(ii) a The diaphragm is a double-sided coating diaphragm, the substrate film is a PE film, and the thickness of the substrate film is 9-10 mu m; one side of the substrate film is coated with an alumina ceramic material, the thickness of the alumina ceramic material layer is 2-4 mu m, and the alumina ceramic material layer is contacted with the negative plate when being wound or laminated; coating a 2-4 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is matched with the high-temperature high-voltage electrolyte.
The battery core is formed according to the following steps:
s1: after the liquid injection and sealing of the battery core, the air bag is placed upwards for 18 hours at the temperature of 45 ℃;
s2: applying a surface pressure of 0.82MPa to the battery cell at 80 ℃ on a high-temperature clamp formation cabinet for hot pressing for 120min before the battery cell formation of S1 is finished;
s3: the temperature of the high-temperature clamp formation cabinet is changed from 80 ℃ to 70 ℃, when the temperature of the high-temperature clamp formation cabinet and the temperature of the battery cell completing S2 are reduced to 70 ℃, 0.70Mpa surface pressure is applied to the battery cell for high-temperature clamp formation, and the specific formation process steps are as follows:
(1) charging at 66mA constant current for 10min, and cutting off voltage is 4200 mV;
(2) charging for 15min at constant current of 165mA, wherein the cut-off voltage is 4200 mV;
(3) charging at 330mA for 20min with constant current, and the cut-off voltage is 4200 mV;
(4) charging at 660mA for 30min at constant current, wherein the cut-off voltage is 4200 mV;
(5) 1650mA, and the cut-off voltage is 4200 mV.
S4: changing the temperature of the high-temperature clamp formation cabinet from 70 ℃ to 80 ℃, and applying a surface pressure of 0.82MPa to the battery cell for hot pressing for 120min when the temperature of the formation cabinet and the battery cell completing S3 is raised to 80 ℃;
s5: standing the cell airbag which is finished with the S4 upwards at 55 ℃ for 24 h;
s6: and (4) upwards cooling the cell airbag subjected to S5 to 25 +/-3 ℃, standing at 25 +/-3 ℃ for 18 hours, and then exhausting.
The mass of the battery cell before liquid injection is m1, the mass of the battery cell after liquid injection is m2, the mass of the battery cell after air extraction is m3, the liquid injection amount of the battery cell is (m 2-m 1), the liquid retention amount of the battery cell is (m 3-m 1), and the liquid loss amount of the battery cell is (m 2-m 3), and the liquid loss amount of the battery cell is controlled to be 0.5-1.5 g by adjusting the liquid injection amount.
Example 2:
the soft package polymer thin lithium ion battery with the model number of 3250120-3300 adopts 4.35V lithium cobalt oxide as the positive electrode active material, and the positive electrode formula is lithium cobalt oxide: SP: KS-6: PVDF = 95.4: 2.0: 0.5: 2.1, compacting the positive electrode to 4.05-4.10 g/cm3(ii) a The negative active material adopts artificial graphite, and the negative formula is artificial graphite: SP: CMC: SBR = 94.9: 1.2: 1.6: 2.3, the compaction of the negative electrode is 1.60-1.65 g/cm3. The diaphragm is a double-sided coating diaphragm, the substrate film is a PE film, and the thickness of the substrate film is 9-10 mu m; one side of the substrate film is coated with an alumina ceramic material, the thickness of the alumina ceramic material layer is 2-4 mu m, and the alumina ceramic material layer is contacted with the negative plate when being wound or laminated; coating an alumina ceramic layer with the thickness of 2-4 mu m on the other surface of the substrate film, then coating a PVDF material with the thickness of 2-4 mu m, and winding or laminating the PVDF material with the positive plateContacting; the electrolyte is matched with the high-temperature high-voltage electrolyte.
The battery core is formed according to the following steps:
s1: after the battery core is injected with liquid and sealed, the air bag is placed upwards for 12 hours at the temperature of 55 ℃;
s2: applying a surface pressure of 0.90MPa to the battery cell at 80 ℃ on a high-temperature clamp formation cabinet for hot pressing for 100min before the battery cell formation of S1 is finished;
s3: the temperature of the high-temperature clamp formation cabinet is changed from 80 ℃ to 70 ℃, when the temperature of the high-temperature clamp formation cabinet and the temperature of the battery cell completing S2 are reduced to 70 ℃, 0.78 Mpa surface pressure is applied to the battery cell for high-temperature clamp formation, and the specific formation process steps are as follows:
(1) charging at constant current of 165mA for 20min, and cutting off voltage is 4200 mV;
(2) charging at 330mA for 30min with constant current, and the cut-off voltage is 4200 mV;
(3) charging at 660mA for 35min with constant current, and the cut-off voltage is 4200 mV;
(4) 1650mA, and the cut-off voltage is 4200 mV.
S4: changing the temperature of the high-temperature clamp formation cabinet from 70 ℃ to 80 ℃, and applying a surface pressure of 0.90MPa to the battery cell for hot pressing for 100min when the temperature of the formation cabinet and the battery cell completing S3 is raised to 80 ℃;
s5: standing the cell airbag which is finished with the S4 upwards at 60 ℃ for 15 h;
s6: and (4) upwards cooling the cell airbag subjected to S5 to 25 +/-3 ℃, standing at 25 +/-3 ℃ for 20 hours, and then exhausting.
The mass of the battery cell before liquid injection is m1, the mass of the battery cell after liquid injection is m2, the mass of the battery cell after air extraction is m3, the liquid injection amount of the battery cell is (m 2-m 1), the liquid retention amount of the battery cell is (m 3-m 1), and the liquid loss amount of the battery cell is (m 2-m 3), and the liquid loss amount of the battery cell is controlled to be 0.5-1.5 g by adjusting the liquid injection amount.
Example 3:
the soft package polymer thin lithium ion battery with the model number of 3250120-3300 adopts 4.35V lithium cobalt oxide as the positive electrode active material, and the positive electrode formula is lithium cobalt oxide: SP: KS-6: PVDF = 95.2: 2.1: 0.6: 2.1, compacting the positive electrode to 4.05-4.10 g/cm3(ii) a The negative active material adopts artificial graphite, and the negative electrodeThe formula is artificial graphite: SP: CMC: SBR = 94.9: 1.2: 1.6: 2.3, the compaction of the negative electrode is 1.58-1.63 g/cm3. The diaphragm is a double-sided coating diaphragm, the substrate film is a PE film, and the thickness of the substrate film is 9-10 mu m; one side of the substrate film is coated with an alumina ceramic material, the thickness of the alumina ceramic material layer is 2-4 mu m, and the alumina ceramic material layer is contacted with the negative plate when being wound or laminated; coating a 2-4 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is matched with the high-temperature high-voltage electrolyte.
The battery core is formed according to the following steps:
s1: after the liquid injection and sealing of the battery core, placing the air bag upwards for 15h at 60 ℃;
s2: applying a surface pressure of 0.90MPa to the battery cell at 82 ℃ on a high-temperature clamp formation cabinet for hot pressing for 100min before the battery cell formation of S1 is finished;
s3: the temperature of the high-temperature clamp formation cabinet is changed from 82 ℃ to 75 ℃, when the temperature of the high-temperature clamp formation cabinet and the temperature of the battery cell completing S2 are reduced to 75 ℃, 0.80Mpa surface pressure is applied to the battery cell for high-temperature clamp formation, and the specific formation process steps are as follows:
(1) charging at constant current of 165mA for 20min, and cutting off voltage is 4200 mV;
(2) charging at 330mA for 30min with constant current, and the cut-off voltage is 4200 mV;
(3) charging at 660mA for 35min with constant current, and the cut-off voltage is 4200 mV;
(4) 1650mA, and the cut-off voltage is 4200 mV.
S4: changing the temperature of a high-temperature clamp formation cabinet from 75 ℃ to 82 ℃, and applying a surface pressure of 0.90MPa to the battery cell for hot pressing for 100min when the temperature of the formation cabinet and the battery cell completing S3 is raised to 82 ℃;
s5: standing the cell airbag which is finished with the S4 upwards at 65 ℃ for 12 h;
s6: and (4) upwards cooling the cell airbag subjected to S5 to 25 +/-3 ℃, standing at 25 +/-3 ℃ for 24 hours, and then exhausting.
The mass of the battery cell before liquid injection is m1, the mass of the battery cell after liquid injection is m2, the mass of the battery cell after air extraction is m3, the liquid injection amount of the battery cell is (m 2-m 1), the liquid retention amount of the battery cell is (m 3-m 1), and the liquid loss amount of the battery cell is (m 2-m 3), and the liquid loss amount of the battery cell is controlled to be 0.5-1.5 g by adjusting the liquid injection amount.
Comparative example 1:
the soft package polymer thin lithium ion battery with the model number of 3250120-3300 adopts 4.35V lithium cobalt oxide as the positive electrode active material, and the positive electrode formula is lithium cobalt oxide: CNT: PVDF = 97.8: 0.9: 1.3, the positive electrode compaction is 4.05-4.10 g/cm3(ii) a The negative active material adopts artificial graphite, and the negative formula is artificial graphite: SP: CMC: SBR = 95.1: 1.1: 1.6: 2.2, the compaction of the negative electrode is 1.60-1.65 g/cm3. The diaphragm is a single-side coating diaphragm, the matrix film is a PE film, and the thickness of the matrix film is 9-10 mu m; the non-coating surface of the matrix film is contacted with the negative plate when the matrix film is wound or laminated; coating a 2-4 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is matched with the high-temperature high-voltage electrolyte.
The battery core is formed according to the following steps:
s1: after the liquid injection and sealing of the battery core, placing the air bag for 24 hours at normal temperature;
s2: and (3) the battery cell which is subjected to S1 is subjected to surface pressure of 0.70MPa at 50 ℃ on a high-temperature clamp formation cabinet, and is formed according to the following steps:
(1) charging at 330mA for 15min with constant current, and the cut-off voltage is 4200 mV;
(2) charging at 660mA for 35min with constant current, and the cut-off voltage is 4200 mV;
(3) 1650mA, constant current charging for 80min, and cut-off voltage of 4200 mV.
S3: standing the cell airbag which is finished with the step S2 upwards for 24 hours at normal temperature, and then exhausting;
the mass of the battery cell before liquid injection is m1, the mass of the battery cell after liquid injection is m2, the mass of the battery cell after air extraction is m3, the liquid injection amount of the battery cell is (m 2-m 1), the liquid retention amount of the battery cell is (m 3-m 1), and the liquid loss amount of the battery cell is (m 2-m 3), and the liquid loss amount of the battery cell is controlled to be 0.5-1.5 g by adjusting the liquid injection amount.
Comparative example 2:
soft package polymer thin lithium ion battery with model number of 3250120-3300 and positive electrode active material thereof4.35V lithium cobaltate is adopted, and the positive electrode formula is lithium cobaltate: CNT: PVDF = 97.8: 0.9: 1.3, the positive electrode compaction is 4.05-4.10 g/cm3(ii) a The negative active material adopts artificial graphite, and the negative formula is artificial graphite: SP: CMC: SBR = 95.1: 1.1: 1.6: 2.2, the compaction of the negative electrode is 1.60-1.65 g/cm3. The diaphragm is a single-side coating diaphragm, the matrix film is a PE film, and the thickness of the matrix film is 9-10 mu m; the non-coating surface of the matrix film is contacted with the negative plate when the matrix film is wound or laminated; coating a 2-4 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is matched with the high-temperature high-voltage electrolyte.
The battery core is formed according to the following steps:
s1: after the liquid injection and sealing of the battery core, the air bag is placed for 24 hours at 45 ℃ upwards;
s2: and (3) the battery cell which is subjected to S1 is subjected to surface pressure of 0.80MPa at 60 ℃ on a high-temperature clamp formation cabinet, and is formed according to the following steps:
(1) charging at 330mA for 15min with constant current, and the cut-off voltage is 4200 mV;
(2) charging at 660mA for 35min with constant current, and the cut-off voltage is 4200 mV;
(3) 1650mA, constant current charging for 80min, and cut-off voltage of 4200 mV.
S3: and standing the cell airbag which is finished with the S2 upwards at 45 ℃ for 24 hours, cooling to room temperature, and then exhausting.
The mass of the battery cell before liquid injection is m1, the mass of the battery cell after liquid injection is m2, the mass of the battery cell after air extraction is m3, the liquid injection amount of the battery cell is (m 2-m 1), the liquid retention amount of the battery cell is (m 3-m 1), and the liquid loss amount of the battery cell is (m 2-m 3), and the liquid loss amount of the battery cell is controlled to be 0.5-1.5 g by adjusting the liquid injection amount.
The foregoing is only a preferred embodiment of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications and equivalents of the above embodiment may be made in accordance with the technical spirit of the present invention
The chemical modification and the modification are still within the technical scheme of the invention.

Claims (3)

1. A formation process of a flexible package polymer thin lithium ion battery is characterized by comprising the following steps:
s1: after the battery core is subjected to liquid injection, placing the air bag upwards at high temperature for 6-24 hours at 40-65 ℃;
s2: carrying out high-temperature hot pressing on the battery cell subjected to S1 on a high-temperature clamp formation cabinet before formation, wherein the temperature is 60-90 ℃, the surface pressure born by the battery cell is 0.50-1.00 MPa, and the time is 60-180 min;
s3: carrying out high-temperature clamp formation on the battery cell subjected to S2 on a high-temperature clamp formation cabinet, wherein the temperature is 45-80 ℃, the surface pressure borne by the battery cell is 0.50-0.90 MPa, the battery cell is charged to 4.00-4.20V by a current less than 0.5C, the upper limit voltage is 4.20V, and the charging time is 60-240 min;
s4: carrying out high-temperature hot pressing on the battery cell subjected to S3 on a high-temperature clamp formation cabinet, wherein the temperature is 60-90 ℃, the surface pressure born by the battery cell is 0.50-1.00 MPa, and the time is 60-180 min;
s5: placing the battery cell airbag subjected to S4 at a high temperature of 45-75 ℃ for 4-24 h while keeping the battery cell airbag facing upwards;
s6: and (5) upwards cooling the cell airbag which finishes the S5 to 25 +/-5 ℃, and standing for 6-38 hours at the temperature of 25 +/-5 ℃.
2. The formation process of the flexible packaging polymer thin lithium ion battery according to claim 1, wherein the thickness of the flexible packaging polymer thin lithium ion battery is 1.0-5.5 mm.
3. The process according to claim 1, wherein the positive active material of the thin lithium ion battery is lithium cobaltate, and the positive formulation comprises the following components in parts by weight: 95-97% of lithium cobaltate, 1.6-2.2% of SP, 0.4-1.1% of KS-6, 1.4-2.2% of PVDF and 3.85-4.15 g/cm of positive electrode compaction3(ii) a The negative active material is artificial graphite, and the negative formula comprises the following components in percentage by weight: 94-96% of artificial graphite, 1.0-1.3% of SP, 1.5-1.8% of CMC, 1.8-2.5% of SBR,the compaction of the negative electrode is 1.50-1.72 g/cm3(ii) a The isolating membrane is a diaphragm with double-sided coating, the substrate membrane is a PE membrane, the thickness of the substrate membrane is 8-15 mu m, one side of the substrate membrane is coated with an alumina ceramic material, the thickness of the alumina ceramic material is 1-5 mu m, and the substrate membrane is contacted with the negative plate when being wound or laminated; coating a 2-5 mu m aluminum oxide ceramic layer on the other surface of the substrate film, then coating a 2-4 mu m PVDF material on the other surface of the substrate film, and contacting the positive plate during winding or lamination; the electrolyte is a high-temperature electrolyte matched with the electrolyte.
CN201911160867.2A 2019-11-23 2019-11-23 Formation process of flexible-package polymer thin lithium ion battery Withdrawn CN112838280A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113363671A (en) * 2021-06-30 2021-09-07 宁德新能源科技有限公司 Electrochemical device and electronic device
CN113381126A (en) * 2021-06-30 2021-09-10 万向一二三股份公司 Lithium battery diaphragm for inhibiting silicon-carbon negative electrode expansion and hot pressing method of lithium battery core containing same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113363671A (en) * 2021-06-30 2021-09-07 宁德新能源科技有限公司 Electrochemical device and electronic device
CN113381126A (en) * 2021-06-30 2021-09-10 万向一二三股份公司 Lithium battery diaphragm for inhibiting silicon-carbon negative electrode expansion and hot pressing method of lithium battery core containing same
CN113363671B (en) * 2021-06-30 2024-01-30 宁德新能源科技有限公司 Electrochemical device and electronic device

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