CN112961624B - Conductive welding adhesive, conductive double-sided adhesive tape and application - Google Patents

Conductive welding adhesive, conductive double-sided adhesive tape and application Download PDF

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Publication number
CN112961624B
CN112961624B CN202110128933.9A CN202110128933A CN112961624B CN 112961624 B CN112961624 B CN 112961624B CN 202110128933 A CN202110128933 A CN 202110128933A CN 112961624 B CN112961624 B CN 112961624B
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conductive
welding
adhesive
double
inorganic
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CN112961624A (en
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李文文
李兴旺
郭春泰
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02—Electrically-conducting adhesives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J111/00—Adhesives based on homopolymers or copolymers of chloroprene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J145/00—Adhesives based on homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic system; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
    • C09J161/04—Condensation polymers of aldehydes or ketones with phenols only
    • C09J161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
    • C09J179/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
    • C09J183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/001—Conductive additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention provides a conductive welding adhesive, a conductive double-sided adhesive tape and an application, wherein the conductive welding adhesive comprises the following components in percentage by weight: 30-50% of a matrix, 10-30% of a conductive polymer and 20-40% of an inorganic conductive agent. The conductive welding adhesive is prepared by using the conductive polymer, and is matched with the use of the inorganic conductive agent, so that the bonding strength of the conductive adhesive is increased, the conductivity of the conductive adhesive is improved, the conductive adhesive meets the requirements of large-current charging and discharging, the welding procedure in the manufacturing process of a secondary battery is cancelled in the processing process of a lithium battery, the production efficiency is improved, and the manufacturing cost is reduced.

Description

Conductive welding adhesive, conductive double-sided adhesive tape and application
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a conductive welding adhesive, a conductive double-sided adhesive tape and application.
Background
In the prior art, the lithium battery is usually manufactured by adopting a welding process or a conductive welding glue to connect a conductive component, wherein:
and (3) welding design: the current collectors and the tabs, the current collectors and the current collecting pieces/current collecting discs, the current collectors and the shell and other positions needing conductive connection are connected in a welding mode, and the welding mode comprises resistance welding, ultrasonic welding and laser welding. Welding not only can generate metal dust and bring potential safety hazards, but also can generate insufficient solder, so that the product percent of pass is reduced; meanwhile, welding equipment is used, so that the production cost is increased, and the production efficiency is reduced.
Designing conductive welding glue: the formula of the conductive welding glue contains more than 60% of adhesive matrix, less than 40% of conductive agent and a small part of initiator, and the conductive welding glue is smeared on a bonding area for bonding. The existing conductive adhesive is prepared by adding an inorganic conductive agent into an adhesive, the content of an insulating adhesive matrix is high, the conductivity of the adhesive can not meet the use requirement of a high-power battery, although the content of the conductive agent can be continuously increased to improve the conductivity, the addition of excessive conductive agent can reduce the adhesion of the conductive adhesive, so that the bonding strength is reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a conductive soldering paste, a conductive double-sided tape and an application thereof, so as to improve conductivity while ensuring connection strength.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the conductive welding glue comprises the following components in percentage by weight: 30-50% of a matrix, 10-30% of a conductive polymer and 20-40% of an inorganic conductive agent.
Preferably, the matrix is a mixture of one or more of silicone rubber, polyurethane rubber, chloroprene rubber, modified acrylic resin, phenolic resin and terpene resin.
Preferably, the conductive polymer is one or more of polypyrrole, polyaniline, polythiophene, polyparaphenylene and polydopamine.
Preferably, the inorganic conductive agent is one or more of silver, copper, gold, aluminum, nickel, iron, tin, zinc, graphite, carbon black, carbon nanotube, carbon fiber, graphene and VGCF.
Preferably, the coating also comprises a curing agent, and the mass of the curing agent is 0.5-5% of the mass of the substrate.
Preferably, the mass of the curing agent is 1-2% of the mass of the matrix.
A conductive double-sided tape comprising any one of the conductive solder pastes.
Use of a conductive soldering paste as claimed in any one of the preceding claims in a lithium battery manufacturing process.
The conductive double-sided tape is applied to the lithium battery manufacturing process.
Compared with the prior art, the conductive welding adhesive, the conductive double-sided adhesive tape and the application have the following advantages:
the conductive welding adhesive is prepared by using the conductive polymer, and is matched with the use of the inorganic conductive agent, so that the bonding strength of the conductive adhesive is increased, the conductivity of the conductive adhesive is improved, the conductive adhesive meets the requirements of large-current charging and discharging, the welding procedure in the manufacturing process of a secondary battery is cancelled in the processing process of a lithium battery, the production efficiency is improved, and the manufacturing cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
fig. 1 is a schematic view of a connection structure of a current collector and a tab according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure between a current collector and a current collecting plate/disk according to an embodiment of the present invention;
fig. 3 is a schematic view of a connection structure between a current collector and a case according to an embodiment of the present invention;
fig. 4 is a schematic view of a connection structure of a current collecting plate/metal sheet and a cover assembly according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The conductive welding glue comprises the following components in percentage by weight: 30% -50% of a matrix, 10% -30% of a conductive polymer and 20% -40% of an inorganic conductive agent, wherein the conductive polymer preferably comprises a doped high-conductivity polymer.
Preferably, the matrix is a mixture of one or more of silicone rubber, polyurethane rubber, chloroprene rubber, modified acrylic resin, phenolic resin and terpene resin.
Preferably, the conductive polymer is one or more of polypyrrole, polyaniline, polythiophene, polyparaphenylene and polydopamine.
Preferably, the inorganic conductive agent is one or more of silver, copper, gold, aluminum, nickel, iron, tin, zinc, graphite, carbon black, carbon nanotube, carbon fiber, graphene and VGCF.
Preferably, the conductive adhesive also comprises a curing agent, wherein the mass of the curing agent is 0.5-5% of that of the substrate, and the bonding speed of the conductive adhesive is accelerated.
Preferably, the mass of the curing agent is 1-2% of the mass of the matrix.
Besides being prepared into viscous-state conductive welding glue by mixing the base body, the conductive polymer and the inorganic conductive agent for use, the adhesive can also be prepared into conductive double-sided adhesive tape with isolation paper, thereby facilitating the pasting operation.
The conductive welding paste with different components is prepared for carrying out the peel strength and conductivity tests, and the proportion of the components and the test results are shown in table 1.
The peeling strength test condition is that conductive welding glue is smeared on two copper strips with fixed width, a 180-degree peeling test is carried out by using a universal tensile tester after the copper strips are compressed and dried, and the test speed is 25mm/min.
The conductivity test conditions were that the fixed bonding or welding area was 3 × 20mm, and the resistance was measured by connecting electrodes of the same specification.
Table 1: comparison of peeling strength and conductivity of conductive welding glue with different formulas
Figure BDA0002924403040000051
Comparing the data in table 1, comparative examples 1 to 3 show that the conductive welding paste without using a conductive polymer has a higher resistance in the case of a higher peel strength, because the substrate itself having an adhesive effect is not conductive, and increasing the content of the substrate reduces the content of the inorganic conductive agent, which causes an increase in resistance; and decreasing the matrix content results in a decrease in peel strength.
The conductive welding paste has a certain bonding effect by introducing the conductive polymer (polyaniline, polypyrrole and the like), and meanwhile, the conductivity of the conductive welding paste can be increased, the conductivity of the conductive welding paste is increased along with the increase of the conductive polymer and the inorganic conductive agent, but the peel strength of the conductive welding paste tends to be reduced along with the reduction of the content of the matrix, and although the conductive polymer has certain bonding property, the bonding capability of the conductive welding paste is still inferior to that of the matrix.
Through the verification, the formula of the conductive welding glue is as follows: conductive agent polymer: inorganic conductive agent =40:30:30, the peel strength and the conductivity of the material are greatly improved compared with the scheme without adding the conductive polymer, and the possibility of replacing welding and improving overcurrent is provided.
The bonding tension and the contact resistance at the welding position after the conductive welding glue, the conductive double-sided tape and the conventional ultrasonic welding are compared, and the test results are shown in table 2.
Wherein the tensile test conditions are as follows: and (3) coating conductive welding glue or bonding a conductive double-sided adhesive tape on the two copper strips with fixed widths, pressing and drying, and carrying out 180-degree stripping test by using a universal tensile tester at the test speed of 25mm/min with the copper strips subjected to ultrasonic welding (ensuring that the effective widths of welding and bonding are the same).
Contact resistance test conditions: the area of the fixed adhesive or weld was 3X 20mm, and the resistance was measured by connecting electrodes of the same specification.
Table 2: comparison of conductive adhesive and ultrasonic bonding modes
Figure BDA0002924403040000061
Comparing the data in table 2, it can be seen that the peel strength and resistance of the conductive solder paste bonding scheme is comparable to that of the conventional ultrasonic welding scheme, indicating that there is a possibility that it can replace the ultrasonic welding scheme. Although the scheme of conductive double-sided adhesive bonding is currently inferior to the conventional ultrasonic welding scheme in terms of peel strength and conductivity, the operation thereof is simpler and more suitable for use in low-power batteries. The scheme of combining the conductive welding glue and the conductive double-sided adhesive tape is completely superior to the ultrasonic welding scheme in terms of peel strength and resistance.
As shown in fig. 1-4, when the conductive welding adhesive and the conductive double-sided adhesive tape of the present invention are used in the lithium battery assembly process, the conductive welding adhesive or the conductive adhesive tape is applied to the portion to be electrically connected, and then the bonding operation is performed; meanwhile, in order to increase the bonding strength and the conductivity, the conductive welding glue and the electric conduction can also be used in a matching way, namely, the conductive adhesive tape is firstly bonded at the position to be connected, and then the conductive welding glue is coated on the surface or the connection position of the conductive welding glue.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (4)

1. The conductive welding glue is characterized by comprising the following components in percentage by weight: the conductive coating comprises a base body 40%, a conductive polymer 30% and an inorganic conductive agent 30%, wherein the base body is one or a mixture of two of silicon rubber and modified acrylic resin, the conductive polymer is one or a mixture of two of polypyrrole and polyaniline, and the inorganic conductive agent is one or a mixture of two of carbon black and carbon nano tubes.
2. An electrically conductive double-sided tape comprising the electrically conductive solder paste according to claim 1.
3. Use of the conductive solder paste of claim 1 in a lithium battery manufacturing process.
4. Use of the conductive double-sided tape of claim 2 in a lithium battery manufacturing process.
CN202110128933.9A 2021-01-29 2021-01-29 Conductive welding adhesive, conductive double-sided adhesive tape and application Active CN112961624B (en)

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CN100393839C (en) * 2004-11-26 2008-06-11 吉林正基科技开发有限责任公司 Polyaniline conducting adhesive
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CN105131882A (en) * 2015-10-09 2015-12-09 重庆文理学院 Conductive silver adhesive doped with conductive polymers
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