CN115020631A - Connecting device and connecting method for composite current collector and foil - Google Patents
Connecting device and connecting method for composite current collector and foil Download PDFInfo
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- CN115020631A CN115020631A CN202210741966.5A CN202210741966A CN115020631A CN 115020631 A CN115020631 A CN 115020631A CN 202210741966 A CN202210741966 A CN 202210741966A CN 115020631 A CN115020631 A CN 115020631A
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Images
Classifications
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
-
- 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
-
- 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
Abstract
The invention discloses a device and a method for connecting a composite current collector and a foil. Connecting device includes that the foil unreels the roller, the compound mass flow body unreels the roller, the coating part, the fifty percent discount part, press material part and receive material part set gradually, the coating part includes the inlet pipe, the feed back pipe, magazine and gravure roller, the inlet pipe all is connected in the magazine with the feed back pipe, gravure roller sets up in the discharge gate department of magazine, the foil material on the foil unreels the roller passes through coating part and fifty percent discount part in proper order, the compound mass flow body that the compound mass flow body on the compound mass flow body unreels the roller gets into the fifty percent discount part, the fifty percent discount part is used for carrying out dry roll-in to foil material and compound mass flow body fifty percent discount and leading-in pressure material part. The composite current collector and foil connecting device can improve the overcurrent capacity of current from the battery core to the electrode terminal, solve the problem that a high polymer layer cannot overcurrent, reduce resistance, improve bonding force, improve the mechanical strength of materials and improve the use safety of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a device and a method for connecting a composite current collector and a foil.
Background
The battery has the advantages of high energy density, long service life, no pollution, high safety performance and the like, and is widely applied to the fields of consumer electronics and electric automobiles. How to achieve high safety and high energy density of the battery has become a focus of current research. With the continuous development of the battery industry, a current collector with better performance, namely a composite current collector formed by compounding a polymer and a metal, appears. The composite current collector has the following advantages that firstly, the safety is greatly improved. And secondly, the energy density of the battery is effectively improved. And thirdly, the thickness of the copper foil is reduced, and the cost of raw materials is reduced. The composite current collector has a disadvantage in that it is difficult to transfer current in the cell to the electrode terminal since the composite current collector includes an insulating layer formed of a polymer material.
The traditional technical scheme is that laser or ultrasonic (welding tooth welding and rolling welding) is utilized to carry out transfer welding, a foil and a composite current collector are welded together, the metal foil and a metal layer on the side surface of the composite current collector are fused at high temperature in the welding process, and the welding is realized after cooling, so that the overcurrent capacity of the composite current collector is improved. Use laser or ultrasonic wave can be too high at the local heat in welding position (laser is high energy light, and the ultrasonic wave is energy heat energy with high-frequency vibration energy through frictional mode conversion, makes the contact surface melting as an organic whole of metal foil and mass flow body), and the central macromolecular material that is of compound mass flow body is heated and can takes place to warp, can shape during the welding and cause the macromolecular material inflation excessive. When macromolecular material is heated the inflation and is excessive, can cause the adhesion condition, lead to welding tooth itself, and the material between the adhesion, reduce the machining precision, influence the life-span of ultrasonic wave welding tooth, reduce the mechanical strength of material, no matter weld tooth or roll welding, can pierce through the macromolecular layer at welding process, reduced the tensile strength of the compound mass flow body, resistant bending ability variation brings the safety risk for the battery.
Disclosure of Invention
Based on this, the invention provides a connecting device of a composite current collector and a foil, aiming at the problems that laser or ultrasonic wave is used for transfer welding in the traditional technology, the machining precision is reduced, the service life of ultrasonic welding teeth is influenced, the mechanical strength of materials is reduced, the tensile strength of the composite current collector is reduced, and the safety risk is brought to a battery. The composite current collector and foil connecting device can improve the overcurrent capacity of current from the battery core to the electrode terminal, solve the problem that a high polymer layer cannot be subjected to overcurrent, reduce the resistance, improve the bonding force, improve the mechanical strength of materials and improve the use safety of batteries.
An embodiment provides a compound mass flow body and foil connecting device, including foil unreeling roller, compound mass flow body unreeling roller, coating part, fifty percent discount part, pressure material part and receipts material part, the fifty percent discount part press material part and receive material part to set gradually, the coating part includes inlet pipe, feed back pipe, magazine and gravure roll, the inlet pipe with the feed back pipe all connect in the magazine, gravure roll set up in the discharge gate department of magazine, the foil on the foil unreeling roller passes through in proper order coating part and the fifty percent discount part, the compound mass flow body on the compound mass flow body unreeling roller gets into the fifty percent discount part, the fifty percent discount part is used for carrying out dry roll-in to foil and compound mass flow body fifty percent discount and leading-in the pressure material part.
In some embodiments, the coating component further comprises a first proximity roller and a second proximity roller, the first proximity roller and the second proximity roller are disposed at the discharge opening of the magazine and are both located below the gravure roller, and the first proximity roller and the second proximity roller cooperate with the gravure roller to perform gravure coating.
In some of them embodiments, compound mass flow body and foil connecting device still includes tension adjustment part, tension adjustment part includes roller, pendulum roller support and potentiometric sensor, pendulum roller swing joint in the pendulum roller support, potentiometric sensor install in the pendulum roller support is in order to be used for detecting the angle position of pendulum roller, cross the roller with the pendulum roller interval sets up, the foil unreel the roller with between the coating part, and/or compound mass flow body unreel the roller with between the fifty percent discount part, and/or press the material part with receive and be provided with between the material part tension adjustment part.
In some embodiments, the folding part comprises a folding guide rail, a pre-pressing roller and a pre-folding roller, the pre-pressing roller and the pre-folding roller are both arranged at the feeding end of the folding guide rail, the folding guide rail is provided with a guide channel, the size of the guide channel is gradually narrowed along the material advancing direction, the pre-pressing roller is used for pre-pressing the composite current collector, the angle setting range of the pre-folding roller is 20-60 degrees, and the pre-folding roller is used for pre-flanging the horizontally advancing foil.
In some embodiments, the nip part further includes a first press roll and a second press roll, the first press roll and the second press roll are arranged oppositely, a nip interval is formed between the first press roll and the second press roll, and the nip interval between the first press roll and the second press roll is adjustable.
In some of these embodiments, the nip member further comprises an exhaust hood provided to the first press roll and the second press roll.
In some embodiments, the material receiving component comprises a winding roller and a pressing roller, the winding roller is arranged opposite to the pressing roller, and a material receiving interval is formed between the winding roller and the pressing roller.
The invention also aims to provide a method for connecting the composite current collector and the foil.
A method for connecting a composite current collector and a foil comprises the following steps:
preparing a bonding liquid: the components of the bonding liquid comprise a solvent, a dispersing agent, a main material, a thickening agent, a bonding agent and a wetting agent, wherein the solid content range of the bonding liquid is 40-80%, and the viscosity range is 50-400 mpa.s;
coating: coating the adhesive liquid on the surface of the foil;
folding the foil: folding the flat foil in half, and respectively attaching two folded surfaces of the flat foil to two surfaces of the composite current collector;
rolling and drying: carrying out rolling drying treatment on the attached foil and the composite current collector; and
and (6) rolling.
In some of these embodiments, the solvent in the bonding liquid is an aqueous solvent;
and/or the dispersant comprises one or two of ammonium salt compounds and polyphosphate, and the mass percentage of the dispersant in the bonding solution is 0.1-1%;
and/or the main material is one or more of silver powder, copper powder, gold powder and aluminum powder, and the particle size range of the main material is as follows: 0.1-10 μm, wherein the mass percentage of the main material in the bonding liquid is 40-80%;
and/or the viscosity of the thickening agent ranges from 50 mpa.s to 800mpa.s, and the mass percentage of the thickening agent in the bonding liquid is 5 percent to 15 percent;
and/or the adhesive comprises one or more of acrylic acid type adhesive, styrene-butadiene latex, PVA, cinnamic acid, polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbomer resin, polyacrylic acid, polyurethane acrylate, polyacrylate copolymer emulsion, polyurethane and carbamate, and the mass percentage of the adhesive in the adhesive liquid is 5-20%;
and/or the wetting agent comprises one or more of organosilicon ether surfactants, anionic surfactants and nonionic surfactants, and the mass percentage of the wetting agent in the bonding liquid is 0.1-1%.
In some of these embodiments, the adhesive is applied to the surface of the foil by gravure coating, slot extrusion, spray coating, dip coating, electrospinning, or comma coating.
In some of these embodiments, the folding of the foil includes the following steps:
pre-flanging the horizontally advancing foil by using a pre-folding roller;
enabling the foil and the composite current collector to approach through a pre-pressing roller;
the running foil and the composite current collector are folded in half through the folding guide rail, and two surfaces of the folded foil are respectively attached to two surfaces of the composite current collector.
In some embodiments, the foil and the composite current collector are subjected to rolling and drying treatment through a material pressing interval between the first pressing roller and the second pressing roller, and the temperature of the first pressing roller and the temperature of the second pressing roller are in a range of 30-80 ℃.
Above-mentioned compound mass flow body and foil connecting device compares traditional technology and has following beneficial effect:
(1) the brand-new connection mode of the metal foil and the composite current collector, namely the bonding mode, is provided through the coating component, the overcurrent capacity of the current from the battery cell to the electrode terminal is improved, and the problem that the high polymer layer cannot overcurrent is solved.
(2) The folding guide rail enables the running foil and the composite current collector to be folded in half, two faces of the folded foil are respectively attached to two faces of the composite current collector, the foil is respectively and simultaneously bonded to the two faces of the composite current collector, the contact area of the metal foil and the current collector is increased, the resistance is reduced, the bonding force is increased, and the bonding force is at least 2 times that of single-face bonding.
(3) The foil is pre-bent before two sides of the foil and the composite current collector are bonded, the angle setting range of the pre-bending roller is set to be 20-60 degrees, the foil which moves horizontally is pre-flanged to realize pre-bending, then the foil is fed into a folding part, the two sides of the foil are gradually close to the composite current collector by the width and the width of the folding guide rail step by step, and the laminating effect is good.
(4) After the foil coated with the bonding liquid and the composite current collector are attached through the folding part, the foil and the composite current collector are rolled and dried through a material pressing interval between the first pressing roller and the second pressing roller, the temperature range of the first pressing roller and the second pressing roller is 30-80 ℃, the heating roller is dried, the drying temperature can be set, the pressure between the first pressing roller and the second pressing roller can be adjusted as required, and the drying effect is good.
(5) According to the invention, the gravure roller is adopted to coat the bonding liquid, the surface of the gravure roller is provided with the laser engraved cells, the depth and the width of the cells determine the ink carrying capacity, and the coating amount of the bonding liquid can be accurately controlled.
(6) In the method for connecting the composite current collector and the foil, a bonding liquid with strong conductivity is adopted, for example, the bonding liquid prepared from a conductive agent, carbon black, a carbon nano tube, conductive metal and the like is adopted, a specific main material is one or more of silver powder, copper powder, gold powder and aluminum powder, a thickening agent, a bonding agent, a wetting agent and the like are also added into the bonding liquid, the main material has strong conductivity, the overcurrent capacity between the foil and the composite current collector can be improved, the bonding agent provides bonding force between the metal foil and the current collector, meanwhile, the main material can be prevented from precipitating due to the use of the thickening agent, the bonding effect is supplemented, high-temperature welding is avoided, and no mechanical damage is caused to the material.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.
For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.
Fig. 1 is a schematic view of a connecting device for a composite current collector and a foil according to an embodiment of the invention.
Description of the reference numerals
10. A composite current collector and foil connecting device; 100. a foil unwinding roller; 200. unwinding a composite current collector; 300. coating the component; 301. a feeding pipe; 301. a material return pipe; 303. a magazine; 304. a gravure roller; 305. a first proximity roller; 306. a second approach roller; 400. folding the component in half; 401. folding the guide rail; 402. pre-pressing rollers; 403. pre-folding rollers; 500. a material pressing part; 501. a first press roll; 502. a second press roll; 503. an exhaust hood; 600. a receiving member; 601. a wind-up roll; 602. a material receiving press roller; 700. a tension adjusting member; 701. passing through a roller; 702. swinging the roller; 703. a swing roller bracket; 21. a foil material; 22. and (4) compounding a current collector.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the application provides a compound mass flow body and foil connecting device 10 to laser or ultrasonic wave carry out the switching and weld in solving traditional technology, the reduction machining precision of existence, influence the life-span of ultrasonic wave welding tooth, reduce the mechanical strength of material, reduce compound mass flow body 22's tensile strength, bring the problem of safety risk for the battery. The following description will be made with reference to the accompanying drawings.
Fig. 1 shows an exemplary composite current collector and foil connecting device 10 provided in an embodiment of the present application, and fig. 1 is a schematic structural diagram of the composite current collector and foil connecting device 10 provided in the embodiment of the present application. The composite current collector and foil connecting device 10 can be used for battery preparation in the fields of consumer electronics, electric automobiles and the like.
In order to more clearly illustrate the structure of the composite current collector and foil connecting device 10, the composite current collector and foil connecting device 10 will be described with reference to the drawings.
For example, referring to fig. 1, a composite current collector and foil connecting device 10 includes a foil unwinding roller 100, a composite current collector unwinding roller 200, a coating component 300, a folding component 400, a pressing component 500, and a receiving component 600.
The folding member 400, the pressing member 500, and the receiving member 600 are sequentially provided.
The coating part 300 includes a feed pipe 301, a return pipe 301, a magazine 303, and a gravure roll 304. The feed pipe 301 and the return pipe 301 are both connected to the material box 303. The gravure roller 304 is disposed at a discharge port of the magazine 303, wherein the discharge port is disposed below the magazine 303. The feeding pipe 301 and the material return pipe 301 are arranged on the top of the material box 303. The foil 21 on the foil unwinding roller 100 passes through the coating member 300 and the half-folding member 400 in this order.
The composite current collector 22 on the composite current collector unwinding roll 200 enters the half-folded part 400.
The folding member 400 is used to fold the foil 21 and the composite current collector 22 in half and introduce the foil into the pressing member 500 for drying and rolling.
The pressing component 500 and the receiving component 60 are electrically connected with the PLC control system, respectively.
In some of these embodiments, gravure roll 304 is an anilox roll, in one of the specific embodiments, 130LPI gauge, 90 μm groove depth. It will be appreciated that in other embodiments, the gravure roll 304 specification 150LPI, a groove depth of 100 μm. The specification of the gravure roll 304 can be set as desired.
In some of these embodiments, the coating member 300 further comprises a first proximity roller 305 and a second proximity roller 306. The first proximity roller 305 and the second proximity roller 306 are disposed at the discharge port of the magazine 303 and both located below the gravure roller 304. The first proximity roller 305 and the second proximity roller 306 cooperate with the gravure roll 304 to perform gravure coating. The first approaching roller 305 and the second approaching roller 306 are disposed in the same horizontal direction so that the foil 21 advances in the horizontal direction.
In some of these embodiments, the composite current collector and foil connection apparatus 10 further comprises a tension adjustment component 700. The tension adjusting member 700 includes a roller 701, a swing roller 702, a swing roller holder 703, and a potential sensor. The swing roller 702 is movably connected to the swing roller support 703. The potential sensor is mounted on the swing roller bracket 703 for detecting the angular position of the swing roller 702. The roller 701 and the swing roller 702 are arranged at intervals. Tension adjusting parts 700 are arranged between the foil unwinding roller 100 and the coating part 300, and/or between the composite current collector unwinding roller 200 and the doubling part 400, and/or between the pressing part 500 and the receiving part 600. The potential sensor is electrically connected with the PLC control system.
Preferably, tension adjusting members 700 are disposed between the foil unwinding roller 100 and the coating member 300, between the composite current collector unwinding roller 200 and the half-folding member 400, and between the pressing member 500 and the receiving member 600. The potential sensor may convert the voltage signal to an angle signal to determine the position of the wobble roller 702. During normal working, the swing roller 702 should be in the middle position, if the swing roller 702 deviates from the middle position, the potential sensor can transmit signals to the PLC control system for processing, the PLC control system gives signals to the servo motor for working according to the signals, and the tension control is stable and accurate.
In some of these embodiments, the half-folding member 400 includes a half-folding guide 401, a pre-press roller 402, and a pre-folding roller 403. The pre-pressing roller 402 and the pre-folding roller 403 are both arranged at the feed end of the folding guide rail 401. The fold back rail 401 has a guide channel. The size of the guide channel gradually narrows along the material advancing direction. Pre-pressing roller 402 is used to pre-press composite current collector 22. The pre-folding roller 403 is set at an angle in the range of 20 to 60 degrees, and the pre-folding roller 403 is used for pre-flanging the horizontally advancing foil 21.
In some of these embodiments, the nip member 500 further includes a first press roll 501 and a second press roll 502. The first pressing roller 501 and the second pressing roller 502 are arranged oppositely, and a nip interval is formed between the first pressing roller 501 and the second pressing roller 502. The nip gap between the first press roll 501 and the second press roll 502 is adjustable. The first pressing roller 501 and the second pressing roller 502 are both hot pressing rollers, the first pressing roller 501 and the second pressing roller 502 are heated and dried at the temperature of 30-80 ℃, the drying temperature can be set, and the pressure between the first pressing roller 501 and the second pressing roller 502 can be adjusted according to needs. Applying pressure to first compression roller 501 and second compression roller 502 can make the bond stronger and smoother.
In some of the embodiments, the first pressing roller 501 and the second pressing roller 502 are driven to rotate by a driving member, and the driving member can also apply pressure to the first pressing roller 501 and the second pressing roller 502 respectively. The drive member is not shown in fig. 1. The driving piece is electrically connected with the PLC control system.
In some of these embodiments, the nip part 500 further includes an exhaust hood 503. An exhaust hood 503 is installed over the first platen roller 501 and the second platen roller 502.
In some embodiments, the receiving member 600 includes a winding roller 601 and a receiving pressure roller 602. The winding roller 601 and the material receiving press roller 602 are arranged oppositely, and a material receiving interval is formed between the winding roller 601 and the material receiving press roller 602. The winding roller 601 is driven to rotate, and the material receiving pressing roller 602 is matched with the winding roller 601 to receive the finished product. The material collecting pressing roller 602 is arranged below the winding roller 601, and the material collecting pressing roller 602 is used for discharging air during winding of materials, so that the air content is reduced, and the winding is smoother.
In some of these embodiments, the receiving member 600 further comprises a receiving driving member. The material receiving driving component is connected to the winding roller 601 for driving the winding roller 601 to rotate. The material receiving driving part is electrically connected with the PLC control system.
The invention also aims to provide a method for connecting the composite current collector and the foil.
A method for connecting a composite current collector and a foil comprises the following steps:
preparing a bonding liquid: the components of the bonding liquid comprise a solvent, a dispersant, a main material, a thickening agent, a bonding agent and a wetting agent, the solid content range of the bonding liquid is 40-80%, and the viscosity range is 50-400 mpa.s; adding the components in sequence, and stirring at a certain rotating speed for a certain time after adding each component to finally form a bonding solution;
coating: coating the adhesive liquid on the surface of the foil 21;
folding the foil 21 in half: folding the flat foil 21 in half, and respectively attaching two folded surfaces of the flat foil to two surfaces of the composite current collector 22;
rolling and drying: performing rolling drying treatment on the attached foil 21 and the composite current collector 22; and
and (6) rolling.
In some of these embodiments, the composite current collector 22 and the foil 21 operate over the entire operating speed range: 10-100 m/min. For example, in one embodiment, the overall running speed of the composite current collector 22 and the foil 21, i.e., the coating speed, is 30 m/min.
In some of these embodiments, the amount of adhesive applied is in the range of 0.1 to 1.5g/m 2 . For example, in one embodiment, the coating amount is 1.0g/m 2 。
In some of these embodiments, the solvent in the bonding liquid is an aqueous solvent. The bonding liquid comprises water, alcohol and the like, and the aqueous solvent has no pollution and is environment-friendly. The addition amount of the solvent in the bonding solution is determined according to the target solid content, and the solvent amount required is small when the solid content is high.
In some of these embodiments, the dispersant includes one or both of an ammonium salt-based compound and a polyphosphate; the dispersant is selected from one or more of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate alkylaryl phosphate, alkylbenzene sulfonate, dialkyl sulfosuccinate, polycarboxylate, poly (methyl) acrylic acid derivative and maleic anhydride copolymer, and the mass percentage of the dispersant in the bonding liquid is 0.1-1%; the dispersant reduces the surface energy of the solvent, reduces the agglomeration of the main material and enables the main material to be uniformly dispersed in the solvent.
In some embodiments, the main material is one or more of silver powder, copper powder, gold powder, and aluminum powder: the conductivity of the metal is ordered, silver > copper > gold > aluminum, so the main material is preferably silver powder, the silver powder can increase the conductivity of the interface connection between the foil 21 and the current collector, and the main material, such as the particle size range of the silver powder: 0.1-10 μm, and the mass percentage of the main material in the bonding liquid is 40-80%.
In some embodiments, the viscosity of the thickener ranges from 50 mpa.s to 800mpa.s, and the mass percentage of the thickener in the bonding liquid is 5-15%: the viscosity of the silver paste can be adjusted firstly through three functions of the thickening agent, the viscosity is too low in the coating process, the adhesive liquid can fall off, and the retention of the adhesive liquid on the foil 21 is not facilitated; secondly, the sedimentation can be prevented, and the thickening agent is generally in a net-shaped three-dimensional structure, can fix the main material and play a role in dust prevention, and is commonly used, such as sodium carboxymethyl cellulose and the like; and thirdly, the adhesive plays a role of assisting adhesion, and is used together with the adhesive below, so that the adhesion is improved.
In some embodiments, the adhesive includes one or more of acrylic adhesive, styrene-butadiene latex, PVA, cinnamic acid, polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbopol resin, polyacrylic acid, polyurethane acrylate, polyacrylate copolymer emulsion, polyurethane, and urethane, the mass percentage of the adhesive in the adhesive is 5-20%, and the adhesive functions to bond the foil 21 and the surface of the current collector.
In some embodiments, the wetting agent comprises one or more of organosilicon ether surfactants, anionic surfactants and nonionic surfactants, and the mass percentage of the wetting agent in the bonding liquid is 0.1-1%. The anionic surfactant is alkyl aryl sodium sulfonate, butyl sodium naphthalene sulfonate, hydroxyethyl sodium sulfonate or sodium dodecyl sulfonate; the nonionic surfactant is long-chain fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene, polyoxyethylene alkylolamide or fatty alcohol-polyoxyethylene ether. The wetting agent is mainly used for reducing the surface tension of the silver paste and increasing the leveling property, so that the silver paste is more easily coated on the surface of the foil 21.
For example, in one specific example, the preparation of the bonding liquid includes the steps of:
the components of the bonding liquid comprise a solvent, a dispersing agent, a main material, a thickening agent, a bonding agent, a wetting agent and the like.
S11 solvent: water was selected and 26.2Kg of water was added to the double planetary agitator tank.
S12 dispersant: 0.3Kg of ammonium salt dispersant is weighed and added into a double planetary mixer, and the stirring speed is 500rpm for 10 min.
S13 main material: selecting silver powder as a main material, selecting 1 micron for the particle size D50 of the silver powder, weighing 55Kg of silver powder, adding the silver powder into a double-planet stirrer, and stirring at the rotating speed of 1000rpm for 60 min.
S14 thickener: selecting sodium carboxymethylcellulose, weighing 8Kg of CMC, adding into a double-planet stirrer, and stirring at 500rpm for 30 min.
S15 adhesive: selecting acrylic type adhesive, weighing 10Kg of adhesive, adding into a double planetary mixer, stirring at 500rpm for 30 min.
S16 wetting agent: selecting organosilicon ether surfactant, weighing 0.5Kg, adding into double planetary stirrer, stirring at 300rpm for 20 min.
S17, the components are added in sequence to finally form the bonding liquid, wherein the solid content of the bonding liquid is 55%, and the viscosity is 230 mpa.s.
In some embodiments, the adhesive is applied to the surface of the foil 21 by gravure coating, slot extrusion, spray coating, dip coating, electrospinning, or comma coating. Preferably, the coating is gravure coating, narrow slit extrusion in one of the embodiments, depending on the slurry properties. As shown in fig. 1, when gravure coating is used, the method specifically includes: the foil 21 is firstly released from a releasing reel and gradually fed to the lower part of a coating head, the coating head can be pressed down against the upper foil 21, so that the silver paste on the gravure roll 304 is transferred to the surface of the foil 21, a first approaching roll 305 and a second approaching roll 306 are arranged below the foil 21, the first approaching roll 305 and the second approaching roll 306 have two functions, and firstly, the foil 21 above is supported, so that the foil surface is flat when the foil is coated; second, the first proximity roller 305 and the second proximity roller 306 can be adjusted up and down, so as to adjust the wrap angle of the foil 21 and the gravure roller 304, and solve some defects of the coating process, such as streaks, missing coating, and the like.
In some of these embodiments, the folding of the foil 21 includes the following steps:
pre-flanging the horizontally advancing foil 21 by a pre-folding roller 403; a pre-folding roller 403 with a certain angle is arranged at the rear of the coating component 300 and in front of the doubling component 400, the pre-folding roller 403 is used for pre-flanging the horizontally advancing foil 21, and the angle of the pre-folding roller 403 is set within the range of 20-60 degrees.
Bringing the foil 21 and the composite current collector 22 close by a pre-press roll 402; specifically, a pre-press roller 402 is installed before the half-folded part 400 is fast-forwarded, so that the foil 21 and the composite current collector 22 are close to each other, and further, a deviation corrector is installed for alignment to prepare for entering the half-folded part 400.
The running foil 21 and the composite current collector 22 are folded in half through folding the guide rail 401 in half, so that two surfaces of the foil 21 folded in half are respectively attached to two surfaces of the composite current collector 22. The opening of the folding guide rail 401 is wide and narrow, so that the running foil 21 and the composite current collector 22 can be folded in half gradually, and when the material is discharged from the folding guide rail 401, the foil 21 and the composite current collector 22 are basically attached and folded in half.
In some embodiments, the foil 21 and the composite current collector 22 are subjected to rolling and drying treatment through a pressing interval between a first pressing roller 501 and a second pressing roller 502, the temperature range of the first pressing roller 501 and the second pressing roller 502 is 30-80 ℃, the material is heated and volatilized through a pair of rollers to form a solvent such as moisture in silver paste, the solvent can be collected through an exhaust hood 503 after being heated and volatilized, volatilized water vapor can be timely discharged, and excessive moisture condensation and solidification and bonding of an adhesive are prevented; the pressing interval between the first pressing roller 501 and the second pressing roller 502 is adjustable, certain pressure is applied to the materials during drying, and bonding is firmer and smoother.
Above-mentioned compound mass flow body and foil connecting device 10 compares traditional technology and has following beneficial effect:
(1) the coating component 300 provides a brand-new connection mode, namely an adhesion mode, of the metal foil 21 and the composite current collector 22, improves the overcurrent capacity of current from the battery cell to the electrode terminal, and solves the problem that a high polymer layer cannot overcurrent.
(2) The operating foil 21 and the composite current collector 22 are folded in half through the folding guide rail 401, two faces of the foil 21 folded in half are respectively attached to two faces of the composite current collector 22, the foil 21 is respectively and simultaneously bonded to two faces of the composite current collector 22, the contact area of the metal foil 21 and the current collector is increased, the resistance is reduced, the bonding force is increased, and the bonding force is at least 2 times of the single-face bonding force.
(3) The foil 21 is pre-bent before the two sides of the foil 21 and the composite current collector 22 are bonded, the angle setting range of the pre-bending roller 403 is 20-60 degrees, the foil 21 which horizontally advances is pre-flanged to be pre-bent, then the foil is sent into the folding part 400, the two sides of the foil 21 are gradually close to the composite current collector 22 by the size of the folding guide rail 401 gradually from wide to narrow, and the laminating effect is good.
(4) After the foil 21 coated with the adhesive liquid and the composite current collector 22 are attached to each other through the folding part 400, the foil 21 and the composite current collector 22 are subjected to rolling drying treatment through a pressing interval between the first pressing roller 501 and the second pressing roller 502, the first pressing roller 501 and the second pressing roller 502 are heated and dried at a temperature ranging from 30 ℃ to 80 ℃, the drying temperature can be set, the pressure between the first pressing roller 501 and the second pressing roller 502 can be adjusted as required, and the drying effect is good.
(5) In the invention, the gravure roller 304 is used for coating the bonding liquid, the surface of the gravure roller 304 is provided with laser engraved cells, the depth and the width of the cells determine the ink carrying capacity, and the coating amount of the bonding liquid can be accurately controlled.
(6) In the method for connecting the composite current collector and the foil, a bonding liquid with strong conductivity is adopted, for example, the bonding liquid prepared from a conductive agent, carbon black, a carbon nano tube, conductive metal and the like is adopted, a specific main material is one or more of silver powder, copper powder, gold powder and aluminum powder, a thickening agent, a bonding agent, a wetting agent and the like are also added into the bonding liquid, the conductivity of the main material is strong, the overcurrent capacity between the foil 21 and the composite current collector 22 can be improved, the bonding agent provides bonding force between the metal foil 21 and the current collector, and meanwhile, the use of the thickening agent can prevent the main material from precipitating and supplement the bonding effect, so that high-temperature welding is avoided, and no mechanical damage is caused to the materials.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. The utility model provides a compound mass flow body and foil connecting device, a serial communication port, include that foil unreels roller, compound mass flow body unreels roller, coating part, fifty percent discount part, presses material part and receives the material part, the fifty percent discount part press material part and receive the material part to set gradually, the coating part includes inlet pipe, feed back pipe, magazine and gravure roll, the inlet pipe with the feed back pipe all connect in the magazine, gravure roll set up in the discharge gate department of magazine, the foil on the foil unreels the roller passes through in proper order coating part and the fifty percent discount part, the compound mass flow body on the compound mass flow body unreels the fifty percent discount part, the fifty percent discount part is used for carrying out dry roll-in to foil and compound mass flow body fifty percent discount and leading-in the material part presses the dry roll-in.
2. The device for connecting a composite current collector and a foil as claimed in claim 1, wherein the coating component further comprises a first proximity roller and a second proximity roller, the first proximity roller and the second proximity roller are disposed at the discharge port of the material box and are both located below the gravure roller, and the first proximity roller, the second proximity roller and the gravure roller are matched to perform gravure coating.
3. The composite current collector and foil connecting device according to claim 1, wherein the composite current collector and foil connecting device further comprises a tension adjusting component, the tension adjusting component comprises a roller, a swing roller support and a potential sensor, the swing roller is movably connected to the swing roller support, the potential sensor is installed on the swing roller support to detect the angle of the swing roller, the roller is arranged at an interval with the swing roller, the foil unwinding roller is arranged between the coating components and/or the composite current collector unwinding roller is arranged between the folding components and/or the pressing component is arranged between the material receiving components, and the tension adjusting component is arranged between the material receiving components.
4. The device for connecting the composite current collector with the foil as claimed in any one of claims 1 to 3, wherein the folding component comprises a folding guide rail, a pre-pressing roller and a pre-folding roller, the pre-pressing roller and the pre-folding roller are both arranged at a feed end of the folding guide rail, the folding guide rail is provided with a guide channel, the size of the guide channel is gradually narrowed along a material advancing direction, the pre-pressing roller is used for pre-pressing the composite current collector, the angle setting range of the pre-folding roller is 20 degrees to 60 degrees, and the pre-folding roller is used for pre-flanging the foil which advances horizontally.
5. The device for connecting a composite current collector and a foil as claimed in any one of claims 1 to 3, wherein the pressing part further comprises a first pressing roller and a second pressing roller, the first pressing roller and the second pressing roller are arranged oppositely, a pressing interval is formed between the first pressing roller and the second pressing roller, and the pressing interval between the first pressing roller and the second pressing roller is adjustable.
6. The device for connecting a composite current collector and a foil as claimed in claim 5, wherein the pressing part further comprises an exhaust hood, and the exhaust hood is arranged on the first pressing roller and the second pressing roller.
7. The device for connecting the composite current collector and the foil as claimed in any one of claims 1 to 3 and 6, wherein the material receiving component comprises a winding roller and a pressing roller, the winding roller is arranged opposite to the pressing roller, and a material receiving space is formed between the winding roller and the pressing roller.
8. A method for connecting a composite current collector and a foil is characterized by comprising the following steps:
preparing a bonding liquid: the components of the bonding liquid comprise a solvent, a dispersing agent, a main material, a thickening agent, a bonding agent and a wetting agent, wherein the solid content range of the bonding liquid is 40-80%, and the viscosity range is 50-400 mpa.s;
coating: coating the adhesive liquid on the surface of the foil;
folding the foil: folding the flat foil in half, and respectively attaching two folded surfaces of the flat foil to two surfaces of the composite current collector;
rolling and drying: carrying out rolling drying treatment on the attached foil and the composite current collector; and
and (6) rolling.
9. The method for connecting the composite current collector and the foil as claimed in claim 8, wherein the solvent in the bonding solution is an aqueous solvent;
and/or the dispersant comprises one or two of ammonium salt compounds and polyphosphate, and the mass percentage of the dispersant in the bonding solution is 0.1-1%;
and/or the main material is one or more of silver powder, copper powder, gold powder and aluminum powder, and the particle size range of the main material is as follows: 0.1-10 μm, wherein the mass percentage of the main material in the bonding liquid is 40-80%;
and/or the viscosity of the thickening agent ranges from 50 mpa.s to 800mpa.s, and the mass percentage of the thickening agent in the bonding liquid is 5 percent to 15 percent;
and/or the adhesive comprises one or more of acrylic adhesive, styrene-butadiene latex, PVA, cinnamic acid, polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbomer resin, polyacrylic acid, polyurethane acrylate, polyacrylate copolymer emulsion, polyurethane and carbamate, and the mass percentage of the adhesive in the adhesive liquid is 5-20%;
and/or the wetting agent comprises one or more of organosilicon ether surfactants, anionic surfactants and nonionic surfactants, and the mass percentage of the wetting agent in the bonding liquid is 0.1-1%.
10. The method for connecting the composite current collector and the foil as claimed in claim 8, wherein the adhesive is applied to the surface of the foil by gravure coating, slot extrusion, spray coating, dip coating, electrospinning or comma coating.
11. The method for connecting a composite current collector and a foil as claimed in claim 8, wherein the step of folding the foil in half comprises the following steps:
pre-flanging the horizontally advancing foil by using a pre-folding roller;
enabling the foil and the composite current collector to approach through a pre-pressing roller;
the running foil and the composite current collector are folded in half through the folding guide rail, and two surfaces of the folded foil are respectively attached to two surfaces of the composite current collector.
12. The method for connecting the composite current collector and the foil as claimed in claim 8, wherein the foil and the composite current collector are subjected to rolling and drying treatment through a material pressing interval between a first pressing roller and a second pressing roller, and the temperature of the first pressing roller and the second pressing roller ranges from 30 ℃ to 80 ℃.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210741966.5A CN115020631A (en) | 2022-06-28 | 2022-06-28 | Connecting device and connecting method for composite current collector and foil |
| PCT/CN2022/116806 WO2024000805A1 (en) | 2022-06-28 | 2022-09-02 | Composite current collector and foil connecting device and connecting method therefor |
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| CN202210741966.5A CN115020631A (en) | 2022-06-28 | 2022-06-28 | Connecting device and connecting method for composite current collector and foil |
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| CN116705982A (en) * | 2023-08-02 | 2023-09-05 | 深圳海辰储能控制技术有限公司 | Pole piece for battery, preparation method of pole piece, battery and electric equipment |
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| JP4748438B2 (en) * | 2004-07-29 | 2011-08-17 | 日立化成工業株式会社 | Binder resin solution for lithium battery electrode and electrode and battery manufactured from this solution and active material |
| CN207954926U (en) * | 2018-03-15 | 2018-10-12 | 宁德时代新能源科技股份有限公司 | Pole piece die-cutting device |
| CN207896200U (en) * | 2018-03-15 | 2018-09-21 | 宁德时代新能源科技股份有限公司 | The process equipment of secondary cell collector |
| CN108531118A (en) * | 2018-03-29 | 2018-09-14 | 深圳瑞隆新能源科技有限公司 | A kind of conduction glue caking agent and preparation method thereof, soft-package battery plate lug connecting method |
| CN112430442A (en) * | 2020-10-23 | 2021-03-02 | 重庆市紫建电子股份有限公司 | Positive and negative electrode lug binder, preparation method thereof and manufacturing method of pole piece |
-
2022
- 2022-06-28 CN CN202210741966.5A patent/CN115020631A/en not_active Withdrawn
- 2022-09-02 WO PCT/CN2022/116806 patent/WO2024000805A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705982A (en) * | 2023-08-02 | 2023-09-05 | 深圳海辰储能控制技术有限公司 | Pole piece for battery, preparation method of pole piece, battery and electric equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024000805A1 (en) | 2024-01-04 |
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Application publication date: 20220906 |