CN112103566A - Method for manufacturing lithium ion battery by using gel diaphragm - Google Patents

Method for manufacturing lithium ion battery by using gel diaphragm Download PDF

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Publication number
CN112103566A
CN112103566A CN202011126593.8A CN202011126593A CN112103566A CN 112103566 A CN112103566 A CN 112103566A CN 202011126593 A CN202011126593 A CN 202011126593A CN 112103566 A CN112103566 A CN 112103566A
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cold
pole piece
manufacturing
pressing
hot pressing
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杨爽
李�学
苏畅
王俊姿
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/446—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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a method for manufacturing a lithium ion battery by using a gel diaphragm, which comprises the steps of manufacturing a positive pole piece, manufacturing a negative pole piece, baking the pole pieces, laminating, preheating, primary hot pressing, primary cold pressing, manufacturing a battery cell, pre-charging, aging, secondary hot pressing, secondary cold pressing, forming and finishing the manufacturing of the battery cell. According to the manufacturing method of the lithium ion battery using the gel diaphragm, the gel diaphragm is adopted, firstly, the core package is preheated, hot-pressed and cold-pressed after lamination, and at this stage, the pressure of the hot-pressing and the cold-pressing is small, so that the gel diaphragm is slightly bonded with the pole piece to achieve a fixed core package structure. Second, pressure is applied to the cells during the pre-fill stage. And finally, adding the processes of hot pressing and cold pressing on the battery cell before the formation process, so that the positive/negative pole piece and the gel diaphragm are tightly bonded.

Description

Method for manufacturing lithium ion battery by using gel diaphragm
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a manufacturing method of a lithium ion battery using a gel diaphragm.
Background
With the rapid development of electric vehicles, the market demand of power batteries has been rapidly increased in recent years. Meanwhile, along with the national grade back of the subsidy force of the electric vehicle, the electric vehicle reaching a certain endurance mileage can obtain the financial popularization subsidy, and provides higher requirements for the energy density of the battery core, so that the size of the power battery is larger and larger, and the safety performance of the battery core faces huge challenges due to the large increase of the size of the battery core.
The conventional lithium ion battery has a relatively stable laminated/packaged structure due to a small size, but as the requirement of an electric automobile on the energy density of a battery core is further improved, the size of the battery core is larger and larger, and in order to realize good electrolyte infiltration, the battery is usually in a slender shape, so that the battery core is longer and longer. After the lamination process of the battery core is finished, the battery core in the slender shape is quite easy to deform due to the fact that the whole body is relatively soft in the production process or the transfer process of each process of the following welding, packaging, liquid injection, pre-charging formation and the like, and particularly when the battery core is in a side-standing state, the slender pole piece is quite easy to misplace under the action of gravity, so that the size of a negative pole piece coated positive pole piece and the size of a diaphragm coated negative pole piece are changed, even the situation that the negative pole piece cannot coat the positive pole piece can be generated in a serious situation, and lithium precipitation and performance abnormality of the battery core can be caused. Therefore, in the large-sized battery core, a gel diaphragm is needed to bond the positive electrode and the negative electrode of the battery core so as to fix the positions of the positive electrode and the negative electrode in the battery core, so that dislocation is avoided, and the safety performance and the service life of the battery core are improved.
At present, a lithium ion battery adopting a gel diaphragm generally adopts a hot pressing and cold pressing method to bond the gel diaphragm and a pole piece so as to obtain good battery cell hardness, however, in order to realize good battery cell hardness, more inventions are realized by performing hot pressing and cold pressing on a battery cell for a longer time under a larger pressure, which may cause the serious bonding of the diaphragm and the battery cell, cause the poor subsequent electrolyte infiltration, easily cause the problems of lithium precipitation of the battery cell and the like, and seriously threaten the safety performance of the battery cell.
Disclosure of Invention
In view of the above, the invention aims to provide a method for manufacturing a lithium ion battery by using a gel diaphragm, so as to solve the problems that the battery core has potential safety hazards due to lithium precipitation caused by poor electrolyte infiltration caused by serious adhesion between the diaphragm and the battery core in the manufacturing process of the lithium ion battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for manufacturing a lithium ion battery using a gel diaphragm comprises the following steps:
s1, manufacturing a positive pole piece: the method comprises the following steps of mixing a positive electrode active substance, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the components in a ratio of 0-0.5 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die-cutting to obtain a positive electrode piece;
s2, manufacturing a negative pole piece: mixing a negative electrode active material, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the mixture according to a proportion of 0-0.5 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying the copper foil to obtain a pole roll, and then rolling, slitting and die cutting the pole roll to obtain a negative electrode pole piece;
s3, baking the pole piece: respectively placing the positive pole piece and the negative pole piece under vacuum conditions for baking, wherein the baking temperature is 80-120 ℃, the vacuum degree is-0.08-1.2 Mpa, the nitrogen replacement frequency is 2-15 h/time, the baking time is 5-20 h, the taking-out temperature of the pole pieces is 20-60 ℃, and the water content of the pole pieces after baking is 20-250 ppm;
s4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 50-90 ℃, and the preheating time is 10-40 min;
s6, primary hot pressing: putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece;
s7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
s8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: placing the battery cell which is soaked by the electrolyte into a pre-charging device with a pre-charging clamp, wherein the pre-charging clamp applies uniform and stable pressure to a battery cell main body in the pre-charging and discharging process;
s10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 35-60 ℃, and the aging time is 2-5 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing;
s13, formation: placing the cold-pressed battery core into formation equipment with a formation clamp, and applying uniform and stable pressure to a battery core main body by the formation clamp in the formation charging and discharging processes;
s14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
Further, in the step 1, the positive active material is one or more of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium cobalt oxide and lithium manganese oxide; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is polyvinylidene fluoride, which may be one or more of Solef5130, PVDF761A, HSV 900.
Further, in the step 2, the negative active material is one or more of natural graphite, artificial graphite, mesophase micro carbon spheres, hard carbon, soft carbon, silicon and a silicon-carbon composite; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is one or more of styrene butadiene rubber and sodium carboxymethyl cellulose.
Further, in the step S6, the gel on the surface of the gel separation membrane is an oil-based gel or a water-based gel.
Further, in step S6, the gel is distributed on one or both sides of the membrane.
Further, theThe conditions of the primary hot pressing in step S6 are: the hot pressing temperature is 70-95 ℃, and the hot pressing pressure is 0.02-0.1 kg/mm2The hot pressing time is 60-120 s.
Further, the conditions of the primary cold pressing in the step S7 are as follows: the cold pressing temperature is room temperature, and the cold pressing pressure is in the range of 0.02-0.1 kg/mm2The cold pressing time range is 60-120 s.
Further, in the step S9, the pressure range of the pre-charging clamp is 0.03-0.06 kg/mm2。
Further, in the step S11, the temperature range of the secondary hot pressing is 70-95 ℃, and the hot pressing pressure is 0.02-0.07 kg/mm2The hot pressing time is 120-150 s.
Further, in the step S11, the cold pressing temperature of the secondary cold pressing is room temperature, and the cold pressing pressure range is 0.02-0.07 kg/mm2The cold pressing time range is 120-150 s.
Compared with the prior art, the method for manufacturing the lithium ion battery by using the gel diaphragm has the following advantages:
(1) according to the manufacturing method of the lithium ion battery using the gel diaphragm, the core package is preheated after the lamination of the lithium ion battery is completed, so that the whole temperature consistency of the core package is good, the high consistency of the bonding strength of the gel diaphragm to the positive pole piece/the negative pole piece in each direction and layer surface is favorably kept in the subsequent hot pressing process, and the stability and the safety of the structure of the battery cell are effectively improved.
(2) According to the manufacturing method of the lithium ion battery using the gel diaphragm, disclosed by the invention, the core packet is subjected to a primary hot-pressing process and a primary cold-pressing process after the preheating process, and the pressures of the primary hot-pressing and the primary cold-pressing are both 0.02-0.1 kg/mm2The time of one-time hot pressing and one-time cold pressing is 60-120 s, and the electric core initially has a stable structure due to the smaller hot pressing and cold pressing pressure and the shorter hot pressing and cold pressing time, so that the loose structure of the electric core and the dislocation of a pole piece in the subsequent core cladding moving process are avoided; meanwhile, the diaphragm is only slightly bonded with the positive pole piece and the negative pole piece, which is beneficial to the subsequent electrolysisThe liquid infiltration improves the liquid retention of the battery cell and prevents the occurrence of the phenomenon of lithium precipitation.
(3) According to the manufacturing method of the lithium ion battery using the gel diaphragm, 0.03-0.06 kg/mm is applied to the battery cell in the process of pre-charging and discharging2The pressure of (2) is favorable for the formation of an SEI film in the pre-charging process, interface black spots caused by gas generation in the pre-charging process can be effectively avoided, and the stability of the cell structure can be further improved through the swelling effect of gel.
(4) According to the manufacturing method of the lithium ion battery using the gel diaphragm, the processes of secondary hot pressing and secondary cold pressing are additionally arranged before the formation process, so that the tight bonding of the positive pole piece, the negative pole piece and the gel diaphragm is realized, the electrolyte is fully infiltrated in the cold and hot pressing process before the formation process, the positive pole piece, the negative pole piece and the gel diaphragm can be tightly bonded through the swelling effect of the gel and the electrolyte and the external cold and hot pressing conditions, the hardness of the battery cell is rapidly improved, the hardness can be maintained for a long time, the structure of the battery cell is kept stable in the whole life cycle, and finally the safety performance and the service life of the battery cell are improved.
(5) According to the manufacturing method of the lithium ion battery using the gel diaphragm, the gel diaphragm is adopted, firstly, the core package is preheated, hot-pressed and cold-pressed after lamination, and at this stage, the pressure of the hot-pressing and the cold-pressing is small, so that the gel diaphragm is slightly bonded with the pole piece to achieve a fixed core package structure. Second, pressure is applied to the cells during the pre-fill stage. And finally, adding the processes of hot pressing and cold pressing on the battery cell before the formation process, so that the positive/negative pole piece and the gel diaphragm are tightly bonded.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail with reference to examples.
The noun explains:
SEI film: solid electrolyte interface, solid electrolyte interface film.
A method for manufacturing a lithium ion battery using a gel diaphragm comprises the following steps:
s1, manufacturing a positive pole piece: the method comprises the following steps of mixing a positive electrode active substance, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the components in a ratio of 0-0.5 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die-cutting to obtain a positive electrode piece;
preferably, the positive active material is one or more of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium cobaltate and lithium manganese oxide; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is polyvinylidene fluoride, which may be one or more of Solef5130, PVDF761A, HSV 900.
In one or more real-time examples, the positive electrode active material is lithium iron phosphate, the conductive agent is conductive carbon black Super-P, and the binder is Solef5130, and the positive electrode slurry is obtained by mixing and stirring according to the proportion of 0.9:0.06: 0.04.
S2, manufacturing a negative pole piece: mixing a negative electrode active material, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the mixture according to a proportion of 0-0.5 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying the copper foil to obtain a pole roll, and then rolling, slitting and die cutting the pole roll to obtain a negative electrode pole piece;
preferably, the negative active material is one or more of natural graphite, artificial graphite, mesophase micro carbon spheres, hard carbon, soft carbon, silicon and a silicon-carbon composite; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is one or more of styrene butadiene rubber and sodium carboxymethyl cellulose.
In one or more real-time examples, the negative active material is natural graphite, the conductive agent is conductive carbon black Super-P, and the binder is styrene butadiene rubber, and the negative slurry is obtained by mixing and stirring according to the proportion of 0.92:0.02: 0.06.
S3, baking the pole piece: and respectively placing the positive pole piece and the negative pole piece under a vacuum condition for baking, wherein the baking temperature is 80-120 ℃, the vacuum degree is-0.08-1.2 Mpa, the nitrogen replacement frequency is 2-15 h/time, the baking time is 5-20 h, the taking-out temperature of the pole pieces is 20-60 ℃, and the moisture content of the pole pieces after baking is 20-250 ppm.
S4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 50-90 ℃, and the preheating time is 10-40 min;
after the lamination of the lithium ion battery is completed, the core cladding is preheated, so that the consistency of the overall temperature of the core cladding is good, the gel diaphragm can keep higher consistency on the bonding strength of the positive pole piece and the negative pole piece in each direction and on the layer surface in the subsequent one-time hot pressing process, and the stability and the safety of the battery cell structure are effectively improved.
S6, primary hot pressing: and putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece. Wherein the hot pressing temperature is 70-95 ℃, the hot pressing pressure is 0.02-0.1 kg/mm2, and the hot pressing time is 60-120 s;
the gel is distributed to one or both sides of the membrane.
Preferably, the gel on the surface of the gel diaphragm is oil-based gel or water-based gel;
preferably, the oil-based gel is PVDF gel. The water system gel is polyvinylidene fluoride hexafluoropropylene copolymer (PVDF-HFP) gel.
S7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 0.02-0.1 kg/mm2The cold pressing time is 60-120 s;
preheating, hot pressing and cold pressing are carried out on the core cladding after lamination, and at the stage, the pressure of hot pressing and cold pressing is small, so that the gel diaphragm slightly bonds the pole piece to achieve a fixed core cladding structure, the core cladding cannot have the problems of pole piece dislocation and the like in the following processes of welding, packaging, baking, liquid injection and the like, and the core cladding cannot be seriously bonded to cause poor electrolyte infiltration.
The core cladding is arranged in a primary hot-pressing process and a primary cold-pressing process after the preheating process, and the pressure of the primary hot-pressing and the primary cold-pressing is 0.02-0.1 kg/mm2The time of primary hot pressing and primary cold pressing is 60-120 s, and the small hot pressing and cold pressing pressure and the short hot pressing and cold pressing time enable the battery core to have a stable structure preliminarily, so that loose structure of the battery core and dislocation of pole pieces in the subsequent core cladding moving process are avoided; meanwhile, the diaphragm is only slightly bonded with the positive pole piece and the negative pole piece, so that the subsequent electrolyte infiltration is facilitated, the battery cell liquid retention is improved, and the lithium precipitation phenomenon is prevented.
S8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: putting the battery cell which is soaked by the electrolyte into a battery charging cabinet with a pre-charging clamp, and applying uniform and stable pressure to a battery cell main body by the pre-charging clamp in the pre-charging and discharging process, wherein the pressure of the pre-charging clamp is 0.03-0.06 kg/mm2(ii) a The battery cell is applied with 0.03-0.06 kg/mm in the process of pre-charging and discharging2The pressure of (2) is favorable for the formation of an SEI film in the pre-charging process, interface black spots caused by gas generation in the pre-charging process can be effectively avoided, and the stability of the cell structure can be further improved through the swelling effect of gel.
Pressure is applied to the battery cell in the pre-charging stage so as to effectively avoid interface black spots caused by gas generation in the pre-charging process, and the stability of the battery cell structure can be further improved through the swelling effect of the gel.
S10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 35-60 ℃, and the aging time is 2-5 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing; the hot pressing temperature is 70-95 ℃, and the hot pressing pressure is 0.02-0.07 kg/mm2The hot pressing time is 120-150 s;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing; the cold pressing temperature is room temperature, and the cold pressing pressure is 0.02-0.07 kg/mm2The cold pressing time is 120-150 s;
the process of carrying out secondary hot pressing and secondary cold pressing on the battery cell is added before the formation process, so that the tight bonding of the positive pole piece, the negative pole piece and the gel diaphragm is realized, the electrolyte is fully infiltrated in the cold and hot pressing process before the formation process, and the positive pole piece, the negative pole piece and the gel diaphragm can be tightly bonded through the swelling effect of the gel and the electrolyte and the external cold and hot pressing conditions, so that the hardness of the battery cell is rapidly improved, the hardness can be kept for a long time, the structure of the battery cell is kept stable in the whole life cycle of the battery cell, and finally the safety performance and the service life of the battery cell are improved.
S13, formation: and putting the cold-pressed battery core into a battery charging cabinet with a formation clamp, and applying uniform and stable pressure to the battery core main body by the formation clamp in the formation charging and discharging process. Wherein the pressure of the clamp is 0.005-0.025 kg/mm2；
S14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
Example 1:
s1, manufacturing a positive pole piece: mixing and stirring lithium iron phosphate and conductive carbon black Super-P, Solef5130 according to the proportion of 0.9:0.06:0.04 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a positive electrode piece;
s2, manufacturing a negative pole piece: mixing and stirring natural graphite, conductive carbon black Super-P and styrene butadiene rubber according to the proportion of 0.92:0.02:0.06 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a negative electrode pole piece;
s3, baking the pole piece: and respectively placing the positive pole piece and the negative pole piece in a vacuum condition for baking, wherein the baking temperature is 100 ℃, the vacuum degree is-1 Mpa, the nitrogen replacement frequency is 5 h/time, the baking time is 10h, the pole piece taking temperature is 50 ℃, and the water content of the baked pole piece is 200 ppm.
S4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 80 ℃, and the preheating time is 30 min;
s6, primary hot pressing: and putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece. Wherein the hot pressing temperature is 90 ℃ and the hot pressing pressure is 0.05kg/mm2The hot pressing time is 80 s;
s7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 0.05kg/mm2The cold pressing time is 80 s;
s8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: putting the battery cell which is soaked by the electrolyte into a battery charging cabinet with a pre-charging clamp, and applying uniform and stable pressure to a battery cell main body by the pre-charging clamp in the pre-charging and pre-discharging process, wherein the pressure of the clamp is 0.05kg/mm2；
S10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 40 ℃, and the aging time is 4 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing; the hot pressing temperature is 92 ℃, and the hot pressing pressure is 0.05kg/mm2The hot pressing time is 125 s;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing; the cold pressing temperature is room temperature, and the cold pressing pressure is 0.05kg/mm2The cold pressing time is 125 s;
s13, formation: and putting the cold-pressed battery core into a battery charging cabinet with a formation clamp, and applying uniform and stable pressure to the battery core main body by the formation clamp in the formation charging and discharging process. Wherein the pressure of the clamp is 0.008kg/mm2；
S14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
Example 2:
s1, manufacturing a positive pole piece: mixing and stirring lithium iron phosphate, graphite conductive agents KS-15 and Solef5130 according to the proportion of 0.92:0.06:0.02 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a positive electrode piece;
s2, manufacturing a negative pole piece: mixing and stirring natural graphite, a graphite conductive agent KS-15 and styrene butadiene rubber according to the proportion of 0.95:0.02:0.03 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a negative electrode pole piece;
s3, baking the pole piece: and respectively placing the positive pole piece and the negative pole piece under vacuum conditions for baking, wherein the baking temperature is 85 ℃, the vacuum degree is-1 Mpa, the nitrogen replacement frequency is 10 h/time, the baking time is 8h, the pole piece taking-out temperature is 55 ℃, and the moisture of the baked pole piece is 180 ppm.
S4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 80 ℃, and the preheating time is 35 min;
s6, primary hot pressing: and putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece. Wherein the hot pressing temperature is 90 ℃ and the hot pressing pressure is 0.05kg/mm2The hot pressing time is 80 s;
s7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 0.05kg/mm2The cold pressing time is 80 s;
s8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: putting the battery cell which is soaked by the electrolyte into a battery charging cabinet with a pre-charging clamp, and applying uniform and stable pressure to a battery cell main body by the pre-charging clamp in the pre-charging and pre-discharging process, wherein the pressure of the clamp is 0.05kg/mm2；
S10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 40 ℃, and the aging time is 4 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing; the hot pressing temperature is 92 ℃, and the hot pressing pressure is 0.05kg/mm2The hot pressing time is 125 s;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing; the cold pressing temperature is room temperature, and the cold pressing pressure is 0.05kg/mm2The cold pressing time is 125 s;
s13, formation: and putting the cold-pressed battery core into a battery charging cabinet with a formation clamp, and applying uniform and stable pressure to the battery core main body by the formation clamp in the formation charging and discharging process. Wherein the pressure of the clamp is 0.008kg/mm2；
S14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
Example 3:
s1, manufacturing a positive pole piece: mixing and stirring nickel cobalt lithium manganate, graphite conductive agents KS-15 and Solef5130 according to the proportion of 0.96:0.03:0.01 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a positive electrode piece;
s2, manufacturing a negative pole piece: mixing and stirring artificial graphite, a graphite conductive agent KS-15 and styrene butadiene rubber according to the proportion of 0.96:0.01:0.03 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying to obtain a pole roll, and then rolling, slitting and die cutting to obtain a negative electrode pole piece;
s3, baking the pole piece: and respectively placing the positive pole piece and the negative pole piece under vacuum conditions for baking, wherein the baking temperature is 85 ℃, the vacuum degree is-1 Mpa, the nitrogen replacement frequency is 10 h/time, the baking time is 8h, the pole piece taking-out temperature is 55 ℃, and the moisture of the baked pole piece is 180 ppm.
S4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 80 ℃, and the preheating time is 35 min;
s6, primary hot pressing: and putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece. Wherein the hot pressing temperature is 90 ℃ and the hot pressing pressure is 0.08kg/mm2Hot pressing time is 70 s;
s7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
wherein the cold pressing temperature is room temperature, and the cold pressing pressure is 0.08kg/mm2The cold pressing time is 70 s;
s8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: putting the cell soaked by the electrolyte into a battery charging cabinet with a pre-charging clamp, wherein the pre-charging clamp is used for mainly charging the cell in the process of pre-charging and pre-dischargingThe body is applied with uniform and stable pressure, wherein the pressure of the clamp is 0.05kg/mm2；
S10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 40 ℃, and the aging time is 4 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing; the hot pressing temperature is 92 ℃, and the hot pressing pressure is 0.06kg/mm2The hot pressing time is 130 s;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing; the cold pressing temperature is room temperature, and the cold pressing pressure is 0.06kg/mm2The cold pressing time is 130 s;
s13, formation: and putting the cold-pressed battery core into a battery charging cabinet with a formation clamp, and applying uniform and stable pressure to the battery core main body by the formation clamp in the formation charging and discharging process. Wherein the pressure of the clamp is 0.008kg/mm2；
S14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
According to the scheme, the gel diaphragm is adopted, firstly, the core cladding is preheated, hot-pressed once and cold-pressed once after lamination, and at this stage, the pressure of hot-pressed once and cold-pressed once is smaller, so that the gel diaphragm slightly bonds the pole piece to achieve a fixed core cladding structure. Second, pressure is applied to the cells during the pre-fill stage. And finally, adding a procedure of carrying out secondary hot pressing and secondary cold pressing on the battery cell before the formation procedure, so that the positive pole piece, the negative pole piece and the gel diaphragm are tightly bonded.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for manufacturing a lithium ion battery by using a gel diaphragm is characterized by comprising the following steps: the method comprises the following steps:
s1, manufacturing a positive pole piece: the method comprises the following steps of mixing a positive electrode active substance, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the components in a ratio of 0-0.5 to obtain positive electrode slurry, coating the positive electrode slurry on an aluminum foil, drying to obtain a pole roll, and then rolling, slitting and die-cutting to obtain a positive electrode piece;
s2, manufacturing a negative pole piece: mixing a negative electrode active material, a conductive agent and a binder according to the ratio of 0.5-1: 0-0.5: mixing and stirring the mixture according to a proportion of 0-0.5 to obtain negative electrode slurry, coating the negative electrode slurry on copper foil, drying the copper foil to obtain a pole roll, and then rolling, slitting and die cutting the pole roll to obtain a negative electrode pole piece;
s3, baking the pole piece: respectively placing the positive pole piece and the negative pole piece under vacuum conditions for baking, wherein the baking temperature is 80-120 ℃, the vacuum degree is-0.08-1.2 Mpa, the nitrogen replacement frequency is 2-15 h/time, the baking time is 5-20 h, the taking-out temperature of the pole pieces is 20-60 ℃, and the water content of the pole pieces after baking is 20-250 ppm;
s4, lamination: the pole piece and the gel diaphragm were placed as follows: stacking the positive pole piece, the gel diaphragm and the negative pole piece in sequence to obtain a core package;
s5, preheating: placing the core bag into an oven, and preheating the core bag, wherein the temperature of the oven is 50-90 ℃, and the preheating time is 10-40 min;
s6, primary hot pressing: putting the preheated core bag into a cold and hot press for hot pressing so as to enable the gel on the surface of the gel diaphragm to be respectively bonded with the positive pole piece and the negative pole piece;
s7, primary cold pressing: putting the core bag subjected to hot pressing into a cold and hot press for cold pressing so as to shape the core bag;
s8, manufacturing the battery cell: welding, packaging, baking, injecting liquid, pre-packaging and standing at high and low temperature are carried out on the cold-pressed battery cell to obtain a battery cell which is soaked by the electrolyte;
s9, pre-charging: placing the battery cell which is soaked by the electrolyte into a pre-charging device with a pre-charging clamp, wherein the pre-charging clamp applies uniform and stable pressure to a battery cell main body in the pre-charging and discharging process;
s10, aging: placing the pre-charged battery cell into a drying oven, and aging at a high temperature; the temperature of the oven is 35-60 ℃, and the aging time is 2-5 days;
s11, secondary hot pressing: putting the battery cell after aging into a cold and hot press for hot pressing;
s12, secondary cold pressing: putting the electric core subjected to hot pressing into a cold and hot pressing machine for cold pressing;
s13, formation: placing the cold-pressed battery core into formation equipment with a formation clamp, and applying uniform and stable pressure to a battery core main body by the formation clamp in the formation charging and discharging processes;
s14, completing the cell manufacturing: and performing air exhaust shaping, aging and grading on the formed battery cell to finish the manufacture of the battery cell.
2. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step 1, the positive active material is one or more of lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium cobalt oxide and lithium manganese oxide; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is polyvinylidene fluoride, which may be one or more of Solef5130, PVDF761A, HSV 900.
3. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step 2, the negative active material is one or more of natural graphite, artificial graphite, mesophase micro carbon spheres, hard carbon, soft carbon, silicon and a silicon-carbon composite; the conductive agent is one or more of conductive carbon black Super-P, graphite conductive agent KS-15, graphite conductive agent KS-16, acetylene black, carbon nanofiber and carbon nanotube; the binder is one or more of styrene butadiene rubber and sodium carboxymethyl cellulose.
4. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in step S6, the gel on the surface of the gel separator is an oil-based gel or a water-based gel.
5. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step S6, the gel is distributed on one side or both sides of the membrane.
6. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: the conditions of the primary hot pressing in the step S6 are as follows: the hot pressing temperature is 70-95 ℃, and the hot pressing pressure is 0.02-0.1 kg/mm2The hot pressing time is 60-120 s.
7. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: the conditions of primary cold pressing in the step S7 are as follows: the cold pressing temperature is room temperature, and the cold pressing pressure is in the range of 0.02-0.1 kg/mm2The cold pressing time range is 60-120 s.
8. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step S9, the pressure range of the pre-charging clamp is 0.03-0.06 kg/mm2。
9. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step S11, the temperature range of the secondary hot pressing is 70-95 ℃, and the hot pressing pressure is 0.02-0.07 kg/mm2The hot pressing time is 120-150 s.
10. The method for manufacturing the lithium ion battery using the gel separator according to claim 1, wherein the method comprises the following steps: in the step S11, the cold pressing temperature of the secondary cold pressing is room temperature, and the cold pressing pressure range is 0.02-0.07 kg/mm2The cold pressing time range is 120-150 s.
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Application publication date: 20201218