CN107658423B - Liquid metal alloy pole piece and manufacturing method thereof, lithium ion battery and manufacturing method thereof - Google Patents
Liquid metal alloy pole piece and manufacturing method thereof, lithium ion battery and manufacturing method thereof Download PDFInfo
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- CN107658423B CN107658423B CN201710666359.6A CN201710666359A CN107658423B CN 107658423 B CN107658423 B CN 107658423B CN 201710666359 A CN201710666359 A CN 201710666359A CN 107658423 B CN107658423 B CN 107658423B
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
- H01M4/662—Alloys
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0483—Processes of manufacture in general by methods including the handling of a melt
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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
Abstract
The invention relates to the field of batteries, and discloses a liquid metal alloy pole piece and a manufacturing method thereof. The invention also discloses a lithium ion battery and a manufacturing method thereof, the lithium ion battery comprises a negative pole piece, a positive pole material, a diaphragm, a negative pole material and a liquid metal alloy pole piece, wherein the diaphragm is arranged between the positive pole material and the negative pole material, the positive pole material, the diaphragm and the negative pole material are made into coiled materials, the liquid metal alloy pole piece in a molten state is poured on the positive base aluminum foil of the positive pole material, and the negative pole material is connected with the negative pole piece. The liquid metal alloy pole piece has high flexibility, thermal conductivity, electric conductivity and flexible plasticity, and solves the problem that the positive aluminum foil, the negative copper foil matrix and the diaphragm are pierced by burrs generated by the high hardness and welding of the pole piece in the cold pressing process of battery processing.
Description
Technical Field
The invention relates to the field of batteries, in particular to a liquid metal alloy pole piece and a manufacturing method thereof, and a lithium ion battery and a manufacturing method thereof.
Background
With the use of lithium ion polymer batteries as a new type of lithium batteries in large quantities, the requirements for battery pole pieces, which are the main components of soft package lithium ion batteries, are increasing. The main material of the positive pole piece is made of a pure aluminum sheet, and the main material of the negative pole piece is made of a pure nickel sheet (or a copper sheet or a nickel-plated copper sheet).
In the manufacturing process of the anode plate of the traditional soft package lithium ion battery, the nickel plate is welded on the anode plate by locally plating nickel on an aluminum sheet or welding the nickel plate on the anode plate by ultrasonic waves. The conventional pole piece welding needs to be carried out by the procedures of pole piece pre-welding, pole piece cutting, pole piece final welding, pole piece shaping and the like, wherein the pre-welding is carried out firstly and then the final welding is carried out, and the pre-welding spot part is subjected to secondary ultrasonic vibration by two times of welding, so that welding slag dust is easily generated and enters the inside of a battery to damage the performance of the battery. If the pole piece final welding spot covers the pole piece prewelding spot, the prewelding spot can be damaged and the final welding effect can be deteriorated if the prewelding spot is ultrasonically welded again on the original prewelding spot. In addition, the full-automatic welding process is complex, the welding cost is high, four ultrasonic welding machines are needed in the whole process, the equipment cost is very high, the energy consumption is high, and the manufacturing cost of the battery is high.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a liquid metal alloy pole piece and a manufacturing method thereof, a lithium ion battery and a manufacturing method thereof, and solves the problems that in the prior art, the positive and negative aluminum foils, the copper foil substrate and the diaphragm are pierced due to high pole piece hardness and burrs generated by welding, the welding effect is poor, the welding cost is high, the equipment cost is high, the energy consumption is high, and the battery manufacturing cost is high.
(II) technical scheme
In order to solve the technical problem, the liquid metal alloy pole piece provided by the invention is characterized by comprising a liquid metal alloy matrix and an alloy material, wherein the liquid metal matrix and the alloy material are mixed and heated to a molten state to obtain the liquid metal alloy pole piece in the molten state.
Wherein the liquid metal alloy matrix is one or more of gallium-based, indium-based, tin-based, zinc-based and bismuth-based alloy; or the liquid metal alloy is one of liquid metal aluminum alloy, liquid metal copper alloy, liquid metal zinc alloy, liquid metal silver alloy or liquid metal nickel alloy.
Wherein the alloy material is one or more of metal aluminum, copper, zinc, silver and nickel.
The liquid metal alloy comprises a liquid metal alloy matrix and an alloy material, wherein the liquid metal alloy matrix accounts for 2-88 parts by weight, and the alloy material accounts for 62-100 parts by weight.
The invention also discloses a manufacturing method of the liquid metal alloy pole piece, which is characterized by comprising the following steps:
taking 2-88 parts by mass of a liquid metal alloy matrix;
taking 62-100 parts by mass of one or more of metal aluminum, copper, zinc, silver and nickel to prepare an alloy material;
uniformly mixing the liquid metal alloy matrix and the alloy material, heating to the temperature of 300-400 ℃, and stirring at the speed of 800rpm to fully melt and mix the mixture to obtain a molten liquid metal alloy pole piece;
wherein the liquid metal alloy matrix is one or more of gallium-based, indium-based, tin-based, zinc-based and bismuth-based alloy; or the liquid metal alloy is one of liquid metal aluminum alloy, liquid metal copper alloy, liquid metal zinc alloy, liquid metal silver alloy or liquid metal nickel alloy.
The invention also discloses a lithium ion battery which is characterized by comprising a negative pole piece, a positive pole material, a diaphragm, a negative pole material and the liquid metal alloy pole piece, wherein the diaphragm is arranged between the positive pole material and the negative pole material, the positive pole material, the diaphragm and the negative pole material are made into coiled materials, the positive pole material is connected with the liquid metal alloy pole piece, and the negative pole material is connected with the negative pole piece.
The positive electrode material comprises one or more of lithium cobaltate, lithium manganate and lithium iron phosphate, carbon black and polyvinylidene fluoride.
The invention also discloses a manufacturing method of the lithium ion battery, which is characterized by comprising the following steps:
fixing a positive electrode matrix aluminum foil at one end of the positive electrode material, and fixing a negative electrode matrix copper foil at one end of the negative electrode material;
the diaphragm is arranged between the anode material and the cathode material, made into a coiled material and wound;
and (3) pouring the molten liquid metal alloy pole piece onto the aluminum foil of the anode matrix by using a liquid metal spot welding nozzle, cooling, sticking the joint of the liquid metal alloy pole piece by using a high-temperature adhesive tape, and fixing the cathode material on the copper foil of the cathode matrix.
(III) advantageous effects
The liquid metal alloy pole piece has high flexibility, thermal conductivity and electric conductivity, has flexible plasticity which is not possessed by the traditional pure aluminum sheet positive pole piece, and solves the problem that the positive aluminum foil, the negative copper foil substrate and the diaphragm are pierced due to the large hardness of the pole piece and burrs generated by welding in the cold pressing process of battery processing. The liquid metal alloy pole piece is beneficial to the uniformity of battery current, reduces internal resistance, improves discharge capacity, can reduce the occurrence of insufficient welding or over-welding in the traditional pole piece welding process, and has lower cost and lower energy consumption compared with the traditional pole piece multi-equipment welding process.
Drawings
FIG. 1 is a block diagram of a lithium ion battery of the present invention;
FIG. 2 is a development view of the positive electrode material and the liquid metal alloy pole piece of the present invention;
fig. 3 is a structural diagram of an apparatus for manufacturing a lithium ion battery according to the present invention.
In the figure, 1, a liquid metal alloy pole piece; 2. a negative pole piece; 3. a negative electrode material; 4. a diaphragm; 5. a positive electrode material; 22. a high temperature insulating tape; 23. an anode matrix aluminum foil; 31. a main control box; 32. a thermal sensitive power line; 33. a temperature control box; 34. a heater; 35. a naked battery cell placing disc; 36. a liquid metal spot welding tip; 37. a liquid metal chamber.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses a liquid metal alloy pole piece which is characterized by comprising a liquid metal alloy matrix and an alloy material, wherein the liquid metal matrix and the alloy material are mixed and heated to a molten state to obtain a liquid metal alloy pole piece 1 in the molten state.
The melting point of the obtained liquid metal alloy pole piece is 150-300 ℃, the obtained molten liquid metal alloy pole piece has the viscous flow property of a high polymer material in a heating state, the liquid metal alloy pole piece has higher flexibility, thermal conductivity and electrical conductivity compared with a pure aluminum or nickel pole piece, the risk of puncturing an aluminum foil, a copper foil matrix and a diaphragm of a positive electrode and a negative electrode is effectively avoided, the thermal conductivity is 8-100W/(m DEG C), the thermal conductivity coefficient is more than 10W/m DEG K at room temperature, and the electrical conductivity is 1-9 multiplied by 106 S.m < -1 > at room temperature, so that the uniform current of the battery is facilitated, the internal resistance is reduced, and the discharge capacity is improved.
The liquid metal alloy pole piece disclosed by the invention has high flexibility, thermal conductivity and electrical conductivity, has flexible plasticity which is not possessed by the traditional pure aluminum sheet positive pole piece, solves the problem that the positive aluminum foil, the negative copper foil matrix and the diaphragm are pierced due to the large hardness of the pole piece and burrs generated by welding in the cold pressing process of battery processing, is beneficial to the uniformity of battery current, reduces internal resistance and improves the discharge capacity.
Wherein the liquid metal alloy matrix is one or more of gallium-based, indium-based, tin-based, zinc-based and bismuth-based alloy; or the liquid metal alloy is one of liquid metal aluminum alloy, liquid metal copper alloy, liquid metal zinc alloy, liquid metal silver alloy or liquid metal nickel alloy, and the liquid metal alloy is used for preparing a liquid metal matrix; the alloy material is one or more of metal aluminum, copper, zinc, silver and nickel; the liquid metal alloy matrix comprises, by mass, 2-88 parts of a liquid metal alloy matrix and 62-100 parts of an alloy material.
The invention also discloses a manufacturing method of the liquid metal alloy pole piece, which comprises the following steps: taking 2-88 parts by mass of a liquid metal alloy matrix;
taking 62-100 parts by mass of one or more of metal aluminum, copper, zinc, silver and nickel to prepare an alloy material;
and uniformly mixing the liquid metal alloy matrix and the alloy material, heating to the temperature of 300-400 ℃, and stirring at the speed of 800rpm to fully melt and mix the mixture to obtain the molten liquid metal alloy pole piece.
Wherein the liquid metal alloy matrix is one or more of gallium-based, indium-based, tin-based, zinc-based and bismuth-based alloy; or the liquid metal alloy is one of liquid metal aluminum alloy, liquid metal copper alloy, liquid metal zinc alloy, liquid metal silver alloy or liquid metal nickel alloy.
The liquid metal alloy pole piece has viscous flow property of a high polymer material in a molten state, can be poured into battery pole pieces of various specifications by using a spot welding nozzle, and can solve the problems that the pole piece in the prior art has high hardness, and burrs generated by welding pierce aluminum foils, copper foil substrates and diaphragms of positive and negative electrodes.
As shown in fig. 1, the present invention further discloses a lithium ion battery, which includes a negative electrode plate 2, a positive electrode material 5, a diaphragm 4, a negative electrode material 3, and a liquid metal alloy electrode plate 1 of the present invention, wherein the diaphragm is disposed between the positive electrode material 5 and the negative electrode material 3, the positive electrode material 5, the diaphragm 4, and the negative electrode material 3 are made into a coil, the positive electrode material 5 is connected with the liquid metal alloy electrode plate 1, and the negative electrode material 3 is connected with the negative electrode plate 2.
The positive electrode material 5 comprises one or more of lithium cobaltate, lithium manganate and lithium iron phosphate, carbon black and polyvinylidene fluoride.
The lithium ion battery disclosed by the invention has the advantages that the positive pole piece is a liquid metal alloy prepared by taking liquid metal as a matrix, and the liquid metal alloy not only has the flexibility and the thermal conductivity of the gallium-based alloy, the indium-based alloy, the tin-based alloy, the zinc-based alloy or the bismuth-based alloy, but also has the electrical conductivity of pure aluminum metal, so that the lithium ion battery has the flexibility and the plasticity which are not possessed by the traditional pure aluminum sheet positive pole piece, and the risk of short circuit of the positive pole and the negative pole caused by the fact that burrs are generated due to welding pierce through a diaphragm in the winding process. Meanwhile, the liquid metal positive plate is beneficial to the uniformity of the current of the battery, reduces the internal resistance and improves the discharge capacity.
As shown in fig. 2 and fig. 3, the present invention also discloses a method for manufacturing a lithium ion battery, which is characterized by comprising:
fixing a positive electrode matrix aluminum foil at one end of the positive electrode material, and fixing a negative electrode matrix copper foil at one end of the negative electrode material;
the diaphragm is arranged between the anode material and the cathode material, made into a coiled material and wound;
and (3) pouring the molten liquid metal alloy pole piece onto the aluminum foil of the anode matrix by using a liquid metal spot welding nozzle, cooling, sticking the joint of the liquid metal alloy pole piece by using a high-temperature adhesive tape, and fixing the cathode material on the copper foil of the cathode matrix.
Specifically, the negative electrode can be fixed on the copper foil of the negative electrode matrix by using a conventional negative electrode tab fixing method. As shown in fig. 3, the main control box 31 controls the temperature control box 33 through the thermal power line 32 to control the temperature to be between 150 ℃ and 300 ℃, and the liquid metal spot welding nozzle 36 pours the liquid metal alloy pole piece in the molten state onto the coiled material placed in the bare cell placing disc 35, wherein the coiled material is in the coiled state as shown in fig. 1. Specifically, the gap specification of the liquid metal spot welding tip 36 is: the thickness is adjustable within the range of 0.05-2mm, the width is adjustable within the range of 2-50mm, the positive pole piece cast by the spot welding nozzle can be specified according to the requirement, after cooling, the positive pole piece is stuck and protected by the high-temperature insulating adhesive tape 22 at the joint to prevent breakage, and the processing technology of the positive pole piece is completed. The liquid metal chamber 37 is used to fill with proportioned solid liquid metal.
The liquid metal alloy pole piece has high flexibility, thermal conductivity and electric conductivity, has flexible plasticity which is not possessed by the traditional pure aluminum sheet positive pole piece, and solves the problem that the positive aluminum foil, the negative copper foil substrate and the diaphragm are pierced due to the large hardness of the pole piece and burrs generated by welding in the cold pressing process of battery processing. The liquid metal alloy pole piece is beneficial to the uniformity of battery current, reduces internal resistance, improves discharge capacity, can reduce the occurrence of insufficient welding or over-welding in the traditional pole piece welding process, and has lower cost and lower energy consumption compared with the traditional pole piece multi-equipment welding process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A method for manufacturing a lithium ion battery is characterized by comprising the following steps:
fixing a positive electrode matrix aluminum foil at one end of the positive electrode material, and fixing a negative electrode matrix copper foil at one end of the negative electrode material;
the diaphragm is arranged between the anode material and the cathode material, made into a coiled material and wound;
pouring a liquid metal alloy tab in a molten state onto the aluminum foil of the anode matrix by using a liquid metal spot welding nozzle, after cooling, sticking a high-temperature adhesive tape at the joint of the liquid metal alloy tab, and fixing the cathode tab on the copper foil of the cathode matrix;
wherein: mixing a liquid metal alloy matrix and a metal material and heating to a molten state to obtain a liquid metal alloy tab (1) in the molten state; the liquid metal alloy matrix is 2-88 parts by weight, and the metal material is 62-100 parts by weight;
the liquid metal alloy matrix is an alloy formed by mixing one or more of gallium base, indium base, tin base, zinc base and bismuth base; or the liquid metal alloy matrix is one of liquid metal aluminum alloy, liquid metal copper alloy, liquid metal silver alloy or liquid metal nickel alloy;
the metal material is one or more of metal aluminum, copper, zinc, silver and nickel.
2. The lithium ion battery manufactured by the manufacturing method of the lithium ion battery according to claim 1, wherein the diaphragm is arranged between the positive electrode material (5) and the negative electrode material (3), the positive electrode material (5), the diaphragm (4) and the negative electrode material (3) are made into a coiled material, a positive electrode matrix aluminum foil is connected with the liquid metal alloy tab (1), and a negative electrode matrix copper foil is connected with the negative electrode tab (2).
3. The lithium ion battery according to claim 2, wherein the positive electrode material (5) comprises one or more of lithium cobaltate, lithium manganate and lithium iron phosphate, carbon black and polyvinylidene fluoride.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710666359.6A CN107658423B (en) | 2017-08-07 | 2017-08-07 | Liquid metal alloy pole piece and manufacturing method thereof, lithium ion battery and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710666359.6A CN107658423B (en) | 2017-08-07 | 2017-08-07 | Liquid metal alloy pole piece and manufacturing method thereof, lithium ion battery and manufacturing method thereof |
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| CN107658423A CN107658423A (en) | 2018-02-02 |
| CN107658423B true CN107658423B (en) | 2020-06-02 |
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| CN110518278B (en) * | 2019-08-19 | 2021-11-19 | 南方科技大学 | Solid electrolyte with negative interface layer, preparation method and solid battery |
| CN112563479B (en) * | 2020-12-10 | 2024-04-30 | 香港理工大学 | Hydrogel-shaped zinc anode material, preparation method thereof, anode and battery |
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| US4299891A (en) * | 1972-10-27 | 1981-11-10 | The Richardson Company | Method for forming battery terminals and terminals produced thereby |
| CN1797834A (en) * | 2004-12-23 | 2006-07-05 | 钟发平 | Colloid lead-cloth batteries in high energy, and preparation method |
| CN103534839A (en) * | 2011-06-17 | 2014-01-22 | 株式会社Lg化学 | Part for secondary battery, method for manufacturing same, and secondary battery and multi-battery system manufactured using the part |
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