CN106207068B - Method for preparing pole piece with embedded pole ear - Google Patents
Method for preparing pole piece with embedded pole ear Download PDFInfo
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- CN106207068B CN106207068B CN201610765335.1A CN201610765335A CN106207068B CN 106207068 B CN106207068 B CN 106207068B CN 201610765335 A CN201610765335 A CN 201610765335A CN 106207068 B CN106207068 B CN 106207068B
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The invention discloses a preparation method of a pole piece with a buried pole lug, which comprises the following steps of 1) pre-pasting a foam adhesive tape on a preset position of a current collector, 2) coating slurry on the current collector with the pre-pasted foam adhesive tape, then sending the current collector into an oven for drying, and obtaining the pole piece with a reserved blank area by removing the curled foam adhesive tape after the foam adhesive tape is thermally decomposed, adhered, expanded and curled after reaching a preset temperature; 4) rolling and shearing the pole piece, and enabling the reserved blank area to be positioned at one side edge of the pole piece after shearing; 5) and welding the lug in the reserved blank area. The invention utilizes the foaming adhesive tape to cover a part of the area to realize the full coating of the pole powder, reduces the empty foil at the welding position of the pole lug, and the foaming adhesive tape expands, curls and falls off at a preset temperature to weld the pole lug in the pole piece, so that the process of freely designing the position and the size of the pole lug is supposed to be possible.
Description
Technical Field
The invention relates to the technical field of lithium ion battery preparation, in particular to a preparation method of a pole piece with a buried pole lug.
Background
Currently, lithium ion batteries are classified into circular batteries, square batteries, and polymer batteries. The pole group structure is characterized in that the pole lugs are basically arranged on a current collector (copper foil or aluminum foil) on one side of the pole piece. Such a structure has the following drawbacks:
1, because no electrode powder exists on the current collector for welding the electrode lug, the electrode lug belongs to a hollow foil, and the hollow foil in the structure of the battery pole piece reduces the energy density of the battery because no electrode powder is coated on the hollow foil.
On the other hand, for the polymer battery, the pole piece structure hollow foil and the tab on the hollow foil are wound inside the pole group, which increases the thickness of the whole pole group and then increases the thickness of the battery, while the polymer battery has strict requirements on the thickness, and the thickened battery has a risk of failure.
Disclosure of Invention
The invention aims to provide a method for preparing a pole piece with a buried pole lug, aiming at the technical defects in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a method for preparing a pole piece with embedded pole lugs comprises the following steps,
1) pre-pasting a foaming adhesive tape on a preset position of a current collector, wherein the foaming adhesive tape comprises an adhesive tape base layer, an adhesive film layer and an isolating layer which are arranged from top to bottom, the adhesive film layer comprises 20-70% of high molecular polymer glue and 30-80% of heat-expandable microcapsules, and the high molecular polymer glue comprises 50-100% of polysaccharide polymer and 0-50% of polyfunctional group olefin polymer;
2) coating the slurry on a current collector which is pre-pasted with a foaming adhesive tape, then sending the current collector into an oven for drying, thermally decomposing, sticking, expanding and curling the foaming adhesive tape after reaching a preset temperature,
3) removing the curled foaming adhesive tape to obtain a pole piece with a reserved blank area;
4) rolling and shearing the pole piece, and enabling the reserved blank area to be positioned at one side edge of the pole piece after shearing;
5) and welding the lug in the reserved blank area.
The adhesive tape base layer and the adhesive tape layer in the step 1) are vertically corresponding to each other and form rectangular die cutting blocks which are attached to the isolation layer at intervals, and the cuts are formed on the rectangular die cutting blocks.
The incision includes that it is square four straight line marks to enclose to close, keeps the interval between adjacent straight line mark.
The incisions are a plurality of straight lines arranged at intervals in the transverse direction.
The lengths of the straight lines are staggered in sequence.
The foamed adhesive tape corresponding to the negative plate is subjected to plasma surface grafting treatment to improve the hydrophilicity of the foamed adhesive tape.
And 4) cutting the reserved blank area obtained in the step 3) in the middle in the step 4) and enabling the two small reserved blank areas to be respectively located at one side edge of each pole piece so as to respectively weld and connect the pole lugs.
In the step 1), the foam tapes are respectively and correspondingly adhered on the front side surface and the rear side surface of the current collector.
The polysaccharide polymer is one or more of chitosan, lactose, maltose and cellulose, and the multifunctional olefin polymer is one or more of acrylic acid, polyacrylate, polyacrylamide or polyacrylonitrile.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes the foaming adhesive tape to cover a part of the area to realize the comprehensive coating of the pole powder, reduces the hollow foils at the welding position of the pole lug, and the foaming adhesive tape expands, curls and falls off at the preset temperature to weld the pole lug in the pole piece, so that the process of freely designing the position and the size of the pole lug is possible, the hollow foils in the pole group are fewer, the energy density of the battery is improved, the thickness of the battery is reduced, the internal resistance of the battery is reduced, the cycle number is improved, and the like. The method paves a way for the research of a new generation of high-volume energy density and high-performance lithium ion battery, and simultaneously can realize the rapid production of the lithium ion battery, especially a power battery because the lithium ion battery can be coated comprehensively and the waiting time of a blank section is reduced, the coating speed of a pole piece can reach 60m/min or higher, but the conventional method cannot realize the rapid production.
Drawings
Fig. 1 is a schematic top view of a tab-embedded pole piece according to the present invention;
FIG. 2 is a schematic cross-sectional view of the structure shown in FIG. 1;
FIG. 3 is a schematic view of a foam tape structure;
FIG. 4 is a schematic cross-sectional view of the foam tape;
fig. 5 is a schematic view of another slit structure.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The preparation method of the pole piece with the embedded pole ear comprises the following steps,
1) pre-attaching the foam tapes on the current collector at predetermined positions, such as copper foil or aluminum foil, wherein multiple foam tapes can be attached on one side or the foam tapes can be respectively and correspondingly attached on the front and back sides of the current collector,
2) coating the slurry on a current collector which is pasted with a foaming adhesive tape in advance, wherein the coating is double-sided continuous coating or interval coating, or a single-sided area is reserved at the end part, but the foaming adhesive tape and the current collector at the periphery are completely coated, then sending the current collector into an oven for drying, and simultaneously the foaming adhesive tape starts to be pyrolyzed, adhered, expanded and curled, namely, the pyrolyzing, adhering temperature and the expanding and curling temperature of the foaming adhesive tape should correspond to the drying temperature and the drying time of slurry, namely pole powder, for the foaming adhesive tape, corresponding microcapsules and glue components are selected, and description is not expanded herein,
3) blowing the curled foaming adhesive tape at an outlet at the tail end of the oven to obtain the pole piece with a reserved blank area;
4) rolling and shearing the pole piece, and enabling the reserved blank area to be positioned at one side edge of the pole piece after shearing;
5) and welding a tab in the reserved blank area, sticking a protective tape and the like to finish the manufacture of the pole piece.
The invention utilizes the foaming adhesive tape to cover a part of the area to realize the comprehensive coating of the pole powder, reduces the hollow foils at the welding position of the pole lug, and the foaming adhesive tape expands, curls and falls off at the preset temperature to weld the pole lug in the pole piece, so that the process of freely designing the position and the size of the pole lug is possible, the hollow foils in the pole group are fewer, the energy density of the battery is improved, the thickness of the battery is reduced, the internal resistance of the battery is reduced, the cycle number is improved, and the like. The method paves a way for the research of a new generation of high-volume energy density and high-performance lithium ion battery, and simultaneously can realize the rapid production of the lithium ion battery, especially a power battery because the lithium ion battery can be coated comprehensively and the waiting time of a blank section is reduced, the coating speed of a pole piece can reach 60m/min or higher, but the conventional method cannot realize the rapid production.
Specifically, as shown in fig. 3-5, the foam tape includes a tape base layer 1, an adhesive film layer 2 and an isolation layer 3 arranged from top to bottom, and a plurality of cuts are formed on the foam tape to cut through the tape base layer and the adhesive film layer. The thickness of the foam adhesive tape is 40-65mm, and the thickness of the adhesive tape base layer is 5-30 mm. Wherein, sticky tape basic unit and rete are the rectangle cross cutting cubic that corresponds from top to bottom and paste on the isolation layer, utilize the rectangle cross cutting district of cross cutting, limited monolithic size, it pastes to be convenient for need high accuracy, be provided with the incision on every solitary cross cutting rectangle district simultaneously, the incision has changed the stress of sticky tape basic unit and rete, make it take place to curl more easily, improve the regularity of curling moreover, promote the crimp degree, effectively improve automated production equipment's adaptability.
Preferably, the incisions are a plurality of linear marks 4 arranged at intervals in the transverse direction, and the specific design can adopt various forms, for example, the length of the linear marks is 70% -90% of the length of the corresponding side of the die cutting area, or the lengths of the linear marks are arranged at intervals in a staggered mode in sequence. Or the straight lines are grouped in pairs, and the distance between the two groups is larger than that between the two straight lines in one group.
Of course, the said cut-out can also adopt the oblique layout, namely the setting nonparallel or perpendicular to the side of the square area, can get the above-mentioned result too.
In another embodiment, the incision comprises four straight marks 5 enclosing a square shape, and a space is kept between every two adjacent straight marks. The design of keeping square notches at four corners at intervals is adopted, so that the adhesive film layer is curled towards the center, attachment points are reduced, and residual bonding force is controlled to facilitate separation.
The film layer comprises 20-70% of high molecular polymer glue and 30-80% of microcapsules by mass, and the high molecular polymer glue comprises 50-100% of polysaccharide polymer and 0-50% of polyfunctional group olefin polymer by mass.
Specifically, the polysaccharide polymer is one or more of chitosan, lactose, maltose and cellulose, and the multifunctional olefin polymer is one or more of acrylic acid, polyacrylonitrile, polyacrylamide or polyacrylate.
The gelatin layer can be directly prepared by mixing polysaccharide polymer such as chitosan with microcapsule at a certain proportion, and specifically, the gelatin layer can be prepared by dissolving polysaccharide polymer with weak acid such as acetic acid, homogenizing with microcapsule, and drying.
Polysaccharide polymers such as chitosan and the like are used as base materials of the adhesive film layer, the adhesive film layer has high viscosity and strong adhesive capacity, the viscosity is quickly attenuated along with the rise of temperature, no adhesive is hung, and the requirement of subsequent welding treatment can be met.
In the embodiment, the content of the microcapsules is increased, the adhesive film layer shows good adhesion, and meanwhile, because the high-molecular polymer glue such as chitosan has the characteristic of reducing the temperature-rising adhesion, the high-molecular polymer glue and the chitosan are matched with each other, firstly, the foaming adhesive tape is easy to curl due to the expansion of the microcapsules, and meanwhile, the removal rate can be improved due to the reduction of the viscosity of the chitosan and the like, the adhesion on the surface is avoided, and the removal rate of the foaming adhesive tape is increased from 95% to 99% after being heated. The production efficiency is improved, and the yield of products is increased.
The foam adhesive tape can be used for being pasted on a foil, then slurry is continuously coated, and when the foam adhesive tape is curled and separated, a relatively clean pole piece welding blank area is left on a current collector. When the foam adhesive tape is used for coating the aqueous slurry, the surface of the foam adhesive tape is hydrophobic, and the aqueous negative electrode slurry can slide to the edge of the slurry to be accumulated, so that the local thickness of the coated pole piece is uneven, and the pole piece is damaged due to uneven stress after rolling.
In order to improve the problem, it is necessary to increase the hydrophilicity of the foam tape, and the foam tape is subjected to plasma surface grafting treatment to graft hydrophilic functional groups such as hydroxyl, carboxyl, carbonyl and the like. The hydrophilicity of the surface of the grafted foam adhesive tape is obviously improved, and the slurry can be uniformly covered on the surface of the foam adhesive tape.
The specific operation steps are as follows:
placing the foaming adhesive tape in a plasma device, adjusting the discharge power of the plasma device to be 12W, adjusting the flow of acrylic acid gas to ensure that the discharge vacuum degree is 30Pa and the discharge time is 1 minute, introducing the acrylic acid gas at the speed of 500mL/min to carry out plasma discharge reaction, continuously introducing the reaction gas at the same speed after discharge to carry out subsequent chemical polymerization, adjusting the vacuum degree to be 80Pa and the polymerization time to be 0.5 hour. And carrying out grafting reaction on the surface of the hot-pressed and shaped PET film to obtain the PET film containing the acrylic acid long-chain functional group.
As shown in fig. 1 and 2, the tab-embedded pole piece manufactured by the manufacturing method of the present invention includes a pole piece 11 and a tab 13, wherein the pole piece 11 is coated with a pole powder 12 except a reserved blank area, the reserved blank area is located at one side edge of the pole piece and corresponds to the size of the tab 13, and the tab is welded in the reserved blank area. And simultaneously, protective adhesive tapes 14 are pasted on the front and back surfaces of the tab to prevent burrs. The current collector is an aluminum foil or a copper foil, and the electrode powder is a corresponding lithium ion battery coating material, which is similar to the prior art and is not described herein.
The pole piece only leaves a blank area corresponding to the size of the pole lug locally on the pole piece and welds the pole lug, so that the hollow foil area of the pole piece is less, the energy density of the battery is improved, the effective area of the pole piece is increased, the thickness of the battery is reduced, and a new direction is developed for preparing a future new generation of lithium ion batteries with high energy density and high performance.
Specifically, the reserved blank areas are correspondingly formed on the front side surface and the rear side surface of the pole piece in a front-back mode, and a plurality of coating blank areas are arranged on one side of the pole piece. Wherein, for the convenience of welding the pole piece, the width of the coating blank area is 1-4mm wider than the width of the pole ear, such as 3 mm. The width of the protective tape is 1-4mm, such as 3mm, wider than the width of the coated blank.
Example 1
(1) Designing a buried lug:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 8mm, pole lug width 6mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan high-molecular polymer glue, and designing the size of an empty foil reserved for welding tabs to be 22mm x 10mm according to the requirements of a battery process, a welding tab process and the like, namely the size of the foaming adhesive tape is 22mm x 10 mm; according to the tape-feeding speed of 30m/min, the size of a coating oven of 8m and the maximum coating and drying temperature of 125 ℃, the temperature of the foaming adhesive tape is designed to be 120 ℃, and the temperature of the foaming adhesive tape is generally lower than the maximum temperature but higher than the secondary high temperature so as to realize the curling and the separation of the oven at the last section, the adhesive tape is subjected to die cutting, and the designed notch is formed on the surface of the adhesive tape so as to achieve the purpose that the adhesive tape can be expanded, curled and separated at the foaming temperature.
(3) Pre-pasting a foaming adhesive tape on a current collector:
according to the design size of the pole piece, the foam adhesive tapes are smoothly attached to the current collector at equal intervals in a manual or machine adhesive tape attaching mode.
(4) Coating, rolling and shearing pole pieces:
the coating position is adjusted through the induction foaming adhesive tape, the coating position is enabled to be far away from the foaming adhesive tape to meet the design size, the coating machine is used for continuously coating uniform slurry on a current collector of the pre-pasted foaming adhesive tape, the coating size is detected, parameters such as the coating amount are correct, the curled foaming adhesive tape is swept at the outlet of a pole piece at the tail end of the drying oven, a pole piece with a buried pole lug in a reserved blank area is obtained in the middle of the pole piece, the pole piece is rolled and sheared, and the shearing width and the shearing position are adjusted during shearing to enable the reserved blank area to be located at the edge of the pole piece.
(5) Performing sheet making and winding;
a tabletting process is carried out: drying the cut pole pieces at 130 ℃ for 4 hours in vacuum, cutting the dried pole pieces according to the designed size, welding pole lugs at the reserved blank space, sticking protective tapes on the front and back surfaces of the pole lugs to prevent the problems of burrs and the like, winding the positive and negative pole pieces and the diaphragm together after the pole pieces are produced, and determining the position of the pole lug to be correct after the winding.
(6) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
Example 2
(1) Designing a buried lug:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 12mm, pole lug width 12mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan glue, and designing the size of a reserved blank space of a reserved welding lug to be 15mm x 15mm according to the requirements of a battery process, a welding lug process and the like, namely the size of the foaming adhesive tape is 15mm x 15 mm; according to the tape-feeding speed of 40m/min, the size of a coating oven of 8m, the maximum coating and drying temperature of 125 ℃, the temperature of the foaming adhesive tape is designed to be 120 ℃, the adhesive tape is subjected to die cutting, and a designed transverse cut is made on the surface of the adhesive tape, so that the purpose that the adhesive tape can expand, curl and separate at the foaming temperature is achieved.
(3) Pre-pasting a foaming adhesive tape on a current collector:
according to the design size of the pole piece, the foam adhesive tape is smoothly attached to the current collector at equal intervals in a manual or machine adhesive tape attaching mode.
(4) Coating, rolling and shearing pole pieces:
the coating position is adjusted through the induction foaming adhesive tape, the coating position is enabled to meet the design size from the foaming adhesive tape, the coating machine is used for coating uniform slurry on a current collector of the pre-pasted foaming adhesive tape, the coating size is detected, parameters such as coating amount are correct, the curled foaming adhesive tape is swept at the outlet of a pole piece at the tail end of the drying oven, a pole piece with a buried pole lug in a reserved blank area is obtained in the middle of the pole piece, the pole piece is rolled and sheared, and the shearing width and the shearing position are adjusted during shearing to enable the reserved blank area to be located at the edge of the pole piece.
(5) Performing sheet making and winding;
a tabletting process is carried out: and drying the cut pole piece at 130 ℃ for 4 hours in vacuum, cutting the dried pole piece according to the designed size, welding a lug at the reserved blank space, and sticking protective tapes on the front and back surfaces of the lug to prevent the problems of burrs and the like. And after the production of the sheet, the positive and negative pole pieces and the diaphragm are wound together, and the position of the pole lug is determined to be correct after winding.
(6) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
Example 3
(1) Designing the size of a pole piece of the embedded pole lug, the size of the pole lug and manufacturing related processes:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 12mm, pole lug width 12mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan glue, and designing the size of a reserved blank space of a reserved welding lug to be 15mm x 15mm according to the requirements of a battery process, a welding lug process and the like, namely the size of the foaming adhesive tape is 15mm x 15 mm; according to the running speed of 55m/min, the size of a coating oven is 8m, the maximum coating and drying temperature is 125 ℃, the temperature of the foaming adhesive tape is designed to be 120 ℃, the adhesive tape is subjected to die cutting, and a designed transverse cut is made on the surface of the adhesive tape, so that the purpose that the adhesive tape can expand, curl and separate at the foaming temperature is achieved.
(3) Pre-pasting a foaming adhesive tape on a current collector:
according to the design size of the pole piece, the foam adhesive tape is smoothly attached to the current collector at equal intervals in a manual or machine adhesive tape attaching mode.
(4) Coating, rolling and shearing pole pieces:
the coating position is adjusted by sensing the foaming adhesive tape, so that the distance between the coating position and the foaming adhesive tape meets the design size, the coating machine is used for coating the uniform slurry on the current collector which is pasted with the foaming adhesive tape in advance, parameters such as the coating size and the coating amount are detected to be correct, the curled foaming adhesive tape is blown away at the outlet of the pole piece at the tail end of the drying oven, and the pole piece with the embedded pole lug with the reserved blank area in the middle of the pole piece is obtained. And rolling and shearing the pole piece, and adjusting the shearing width and the shearing position during shearing to ensure that the reserved blank area is positioned at the edge of the pole piece.
(5) Performing sheet making and winding;
a tabletting process is carried out: and drying the cut pole piece at 100 ℃ for 12 hours in vacuum, cutting the dried pole piece according to the designed size, welding pole lugs at the reserved blank space, and sticking protective tapes on the front and back surfaces of the pole lugs to prevent the problems of burrs and the like. And after the production of the sheet, the positive and negative pole pieces and the diaphragm are wound together, and the position of the pole lug is determined to be correct after winding.
(6) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
Example 4
(1) Designing the size of a pole piece of the embedded pole lug, the size of the pole lug and manufacturing related processes:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 8mm, pole lug width 6mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan glue, and designing the size of a reserved blank space of a reserved welding lug to be 22mm x 10mm according to the requirements of a battery process, a welding lug process and the like, namely the size of the foaming adhesive tape is 22mm x 10 mm; according to the tape-feeding speed of 3m/min, the size of a coating oven of 8m, the maximum coating and drying temperature of 125 ℃, the temperature of the foaming adhesive tape is designed to be 105 ℃, the adhesive tape is subjected to die cutting, and a designed transverse cut is made on the surface of the adhesive tape, as shown in figure 2, so that the purpose that the adhesive tape can expand, curl and separate at the foaming temperature is achieved.
(3) Pre-pasting a foaming adhesive tape on a current collector:
according to the design size of the pole piece, the foam adhesive tape is smoothly attached to the current collector at equal intervals in a manual or machine adhesive tape attaching mode.
(4) Coating, rolling and shearing pole pieces:
the coating position is adjusted by sensing the foaming adhesive tape, so that the distance between the coating position and the foaming adhesive tape meets the design size, the coating machine is used for coating the uniform slurry on the current collector which is pasted with the foaming adhesive tape in advance, parameters such as the coating size and the coating amount are detected to be correct, the curled foaming adhesive tape is blown away at the outlet of the pole piece at the tail end of the drying oven, and the pole piece with the embedded pole lug with the reserved blank area in the middle of the pole piece is obtained. And rolling and shearing the pole piece, and adjusting the shearing width and the shearing position during shearing to ensure that the reserved blank area is positioned at the edge of the pole piece.
(5) Performing sheet making and winding;
a tabletting process is carried out: and drying the cut pole piece at 130 ℃ for 4 hours in vacuum, cutting the dried pole piece according to the designed size, welding a pole lug at the reserved blank space, and sticking a protective tape on the front surface and the back surface of the pole lug to prevent the problems of burrs and the like. And after the production of the sheet, the positive and negative pole pieces and the diaphragm are wound together, and the position of the pole lug is determined to be correct after winding.
(6) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
Example 5
(1) Designing the size of a pole piece of the embedded pole lug, the size of the pole lug and manufacturing related processes:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 8mm, pole lug width 6mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan glue, and designing the size of a reserved blank space of a reserved welding lug to be 22mm x 10mm according to the requirements of a battery process, a welding lug process and the like, namely the size of the foaming adhesive tape is 22mm x 10 mm; according to the tape-feeding speed of 60m/min, the size of a coating oven of 8m, the maximum coating and drying temperature of 125 ℃, the temperature of the foaming adhesive tape is designed to be 120 ℃, the adhesive tape is subjected to die cutting, and a designed transverse cut is made on the surface of the adhesive tape, so that the purpose that the adhesive tape can expand, curl and separate at the foaming temperature is achieved.
(3) Pre-pasting a foaming adhesive tape on a current collector:
according to the design size of the pole pieces, the foam adhesive tapes are smoothly pasted on the current collector at equal intervals in a manual or machine adhesive tape pasting mode, and the foam adhesive tapes are pasted at the middle positions of the two pre-cut pole pieces, so that the pole pieces are divided into two parts when being cut conveniently.
(4) Coating, rolling and shearing pole pieces:
and (3) coating the uniform slurry on a current collector with a pre-pasted foaming adhesive tape by using a coating machine, detecting parameters such as coating size, coating amount and the like, and blowing the curled foaming adhesive tape at the outlet of the pole piece at the tail end of the oven to obtain the pole piece of the embedded pole lug with a reserved blank area in the middle of the pole piece. The pole pieces are rolled and cut, a middle cutting process is used during cutting, the reserved blank area reserved by the foaming adhesive tape is cut into two halves, and the two pole pieces are respectively used for welding the pole lugs by using the half reserved blank area.
(5) Performing sheet making and winding;
a tabletting process is carried out: and drying the cut pole piece at 130 ℃ for 4 hours in vacuum, cutting the dried pole piece according to the designed size, welding a pole lug at the reserved blank space, and sticking a protective tape on the front surface and the back surface of the pole lug to prevent the problems of burrs and the like. And after the production of the sheet, the positive and negative pole pieces and the diaphragm are wound together, and the position of the pole lug is determined to be correct after winding.
(5) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
Example 6
(1) Designing the size of a pole piece of the embedded pole lug, the size of the pole lug and manufacturing related processes:
and designing the battery according to the size requirement of the battery model. Taking a polymer battery 405582 positive plate as an example, designing a series of pole piece parameters such as pole piece long powder side length 674mm, pole piece short powder side length 565mm, width 74.8mm, pole lug part inserted into the pole piece length 12mm, pole lug width 12mm, pole lug thickness 0.1mm, pole piece coating amount 41.70mg/cm2, rolling thickness 112 μm, shearing number 2 and the like;
(2) designing parameters such as the size of the foaming adhesive tape, the temperature of the foaming adhesive tape and the like, and manufacturing the foaming adhesive tape:
using a foaming adhesive tape containing foaming microcapsules and chitosan glue, and designing the size of a reserved blank space of a reserved welding lug to be 15mm x 15mm according to the requirements of a battery process, a welding lug process and the like, namely the size of the foaming adhesive tape is 15mm x 15 mm; according to the tape-moving speed of 50m/min, the size of a coating oven of 8m, the maximum coating and drying temperature of 125 ℃, the temperature of the foaming adhesive tape is designed to be 120 ℃, the adhesive tape is subjected to die cutting, and a designed transverse cut is made on the surface of the adhesive tape, as shown in figure 2, so that the purpose that the adhesive tape can expand, curl and separate at the foaming temperature is achieved.
(3) Pre-pasting a foaming adhesive tape on a current collector:
and (3) sticking two (or more) foam adhesive tapes on one pole piece, welding two (or more) pole pieces in the middle of the pole piece, and sticking the foam adhesive tapes on the current collector smoothly at equal intervals in a manual or machine adhesive tape sticking mode according to the design size of the pole piece.
(4) Coating, rolling and shearing pole pieces:
the coating position is adjusted by sensing the foaming adhesive tape, so that the distance between the coating position and the foaming adhesive tape meets the design size, the coating machine is used for coating the uniform slurry on the current collector which is pasted with the foaming adhesive tape in advance, parameters such as the coating size and the coating amount are detected to be correct, the curled foaming adhesive tape is blown away at the outlet of the pole piece at the tail end of the drying oven, and the pole piece with the embedded pole lug with the reserved blank area in the middle of the pole piece is obtained. And rolling and shearing the pole piece, and adjusting the shearing width and the shearing position during shearing to ensure that the reserved blank area is positioned at the edge of the pole piece.
(5) Performing sheet making and winding;
a tabletting process is carried out: and drying the cut pole piece at 130 ℃ for 4 hours in vacuum, cutting the dried pole piece according to the designed size, welding a pole lug at the reserved blank space, and sticking a protective tape on the front surface and the back surface of the pole lug to prevent the problems of burrs and the like. And after the production of the sheet, the positive and negative pole pieces and the diaphragm are wound together, and the position of the pole lug is determined to be correct after winding.
(6) And performing battery liquid injection, packaging, hot pressing, formation, post-treatment and other processes to complete the battery manufacturing.
Compared with the traditional battery, the energy density of the novel battery is improved by 2%, the thickness of the battery is reduced by 1%, and the internal resistance, the multiplying power and the low-temperature performance are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A method for preparing a pole piece with a buried pole lug is characterized by comprising the following steps,
1) pre-pasting a foaming adhesive tape on a preset position of a current collector, wherein the foaming adhesive tape comprises an adhesive tape base layer, an adhesive film layer and an isolating layer which are arranged from top to bottom, a plurality of cuts which penetrate through the adhesive tape base layer and the adhesive film layer are formed on the foaming adhesive tape, the adhesive film layer comprises 20-70% of high molecular polymer glue and 30-80% of heat-expandable microcapsules, and the high molecular polymer glue comprises 50-100% of polysaccharide polymer and 0-50% of polyfunctional group olefin polymer;
2) coating the slurry on a current collector which is pre-pasted with a foaming adhesive tape, then sending the current collector into an oven for drying, thermally decomposing, sticking, expanding and curling the foaming adhesive tape after reaching a preset temperature,
3) removing the curled foaming adhesive tape to obtain a pole piece with a reserved blank area;
4) rolling and shearing the pole piece, and enabling the reserved blank area to be positioned at one side edge of the pole piece after shearing;
4) welding a tab in the reserved blank area;
the adhesive tape base layer and the adhesive tape layer in the step 1) are vertically corresponding to each other and form rectangular die cutting blocks which are attached to the isolation layer at intervals, and the cuts are formed on the rectangular die cutting blocks;
the foamed adhesive tape corresponding to the negative plate is subjected to plasma surface grafting treatment to improve the hydrophilicity of the foamed adhesive tape.
2. The method of claim 1, wherein the cut comprises four straight lines that enclose a square shape, and a space is maintained between adjacent straight lines.
3. The method of claim 1, wherein the cuts are a plurality of transversely spaced linear cuts.
4. The method according to claim 3, wherein the linear marks are alternately arranged in a staggered manner.
5. The preparation method of claim 1, wherein in the step 4), the reserved blank area obtained in the step 3) is cut in the middle, and two small reserved blank areas are respectively positioned at one side edge of each pole piece so as to respectively weld and connect the pole lugs.
6. The method of claim 1, wherein in the step 1), foam tapes are respectively attached to front and rear sides of the current collector correspondingly.
7. The method according to claim 1, wherein the polysaccharide polymer is one or more selected from chitosan, lactose, maltose and cellulose, and the multifunctional olefin polymer is one or more selected from acrylic acid, polyacrylic acid vinegar, polyacrylamide and polyacrylonitrile.
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| KR102354357B1 (en) * | 2016-12-09 | 2022-01-20 | 삼성에스디아이 주식회사 | Rechargeable battery |
| CN108376759A (en) * | 2018-01-17 | 2018-08-07 | 柔电（武汉）科技有限公司 | A kind of soft package lithium battery preparation method improving energy density |
| CN110071252A (en) * | 2019-04-22 | 2019-07-30 | 佛山市实达科技有限公司 | A kind of battery and its negative electrode plate, core |
| CN110335984A (en) * | 2019-06-28 | 2019-10-15 | 宁德新能源科技有限公司 | A kind of dichotomous tab, electrode assembly and battery |
| CN112133877B (en) * | 2020-09-23 | 2022-11-11 | 重庆冠宇电池有限公司 | Pole piece, winding type battery and coating method of pole piece |
| CN112670438A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN112670435A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN113707839A (en) * | 2021-08-02 | 2021-11-26 | 惠州锂威新能源科技有限公司 | Stripe pole piece, rolling process thereof and multi-pole-lug pole piece |
| CN113921764A (en) * | 2021-09-16 | 2022-01-11 | 东莞维科电池有限公司 | Pole piece, preparation method thereof and lithium ion battery |
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| CN1930261A (en) * | 2004-03-11 | 2007-03-14 | 日东电工株式会社 | Heat-peelable pressure-sensitive adhesive sheet and method for processing adhered using the heat-peelable pressure-sensitive adhesive sheet |
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| CN1930261A (en) * | 2004-03-11 | 2007-03-14 | 日东电工株式会社 | Heat-peelable pressure-sensitive adhesive sheet and method for processing adhered using the heat-peelable pressure-sensitive adhesive sheet |
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