CN111769289B - Welding method of flexible current collector - Google Patents
Welding method of flexible current collector Download PDFInfo
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- CN111769289B CN111769289B CN202010559542.8A CN202010559542A CN111769289B CN 111769289 B CN111769289 B CN 111769289B CN 202010559542 A CN202010559542 A CN 202010559542A CN 111769289 B CN111769289 B CN 111769289B
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- Prior art keywords
- welding
- current collector
- flexible current
- pole pieces
- flexible
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- 238000003466 welding Methods 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000011888 foil Substances 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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
- H01M4/64—Carriers or collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a welding method of a flexible current collector, which comprises the following steps: s1, attaching and welding a conductive foil to one side of a flexible current collector to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1; s2, overlapping the pole pieces 1 together, welding again at the positions of the welding points 1 to obtain the pole pieces 2, and then welding the pole pieces 2 with the lugs outside the battery. The invention avoids the insufficient overcurrent capacity caused by directly welding the multilayer composite current collector and also avoids the problems of foil waste, over-thick lug and core deformation caused by double-layer foil wrap welding.
Description
Technical Field
The invention relates to the technical field of foil welding, in particular to a welding method of a flexible current collector.
Background
The application of the flexible current collector in the lithium ion battery is more and more extensive along with the improvement of people on the energy density. The flexible current collector generally includes a support layer, a conductive layer attached to both sides of the support layer. The flexible current collector is externally provided with a metal layer with good electric and heat conducting performance, and the inner layer is an organic molecular insulating layer, so that the welding of the current collector and the internal resistance after welding affect a series of performances of the battery.
The welding of flexible mass flow body generally adopts ultrasonic bonding, it is reserve after welding conductive foil and flexible mass flow body in utmost point ear side, because flexible mass flow body both sides do not switch on, so often adopt the inside mode of pressing from both sides and welding a layer of flexible mass flow body of two-layer conductive foil, but this kind of welding mode is extravagant more serious, and can cause utmost point ear region relatively thicker, especially to the follow-up electric core welding and the equipment of the core that the large capacity rolled up brought the difficulty of certain degree, lead to utmost point ear rosin joint easily, and the weight of battery has been increased to a certain extent.
And the welding of flexible mass flow unilateral and conductive foil is directly adopted, because flexible mass flow body both sides are nonconducting, can't realize the conduction of both sides, lead to the internal resistance of both sides to differ too greatly easily, cause the negative and positive face of pole piece.
Disclosure of Invention
Based on the technical problems in the prior art, the invention avoids the defects of insufficient overcurrent capacity caused by directly welding a plurality of layers of composite current collectors, and also avoids the problems of foil waste, over-thick lugs and core deformation caused by double-layer foil wrapping welding.
The invention provides a welding method of a flexible current collector, which comprises the following steps:
s1, attaching and welding a conductive foil to one side of a flexible current collector to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1;
s2, stacking the pole pieces 1 together, welding the positions of the welding points 1 again to obtain the pole pieces 2, and then welding the pole pieces 2 with the pole lugs outside the battery.
Preferably, in S2, the flexible current collector in the pole piece 2 is arranged adjacent to the conductive foil.
Preferably, in S1, the shape of the welding spots 1 is a continuous strip or an interval dot.
Preferably, in S2, the welding mode is ultrasonic welding, the welding pressure is greater than 30PSI, and the depth of the welding tooth is less than 3mm.
Preferably, in S1, the flexible current collector includes: the conductive coating is attached to the surface of the supporting layer.
Preferably, the thickness of the support layer is 0.1-20 μm.
Preferably, the thickness of the conductive plating layer is 0.1 to 10 μm.
Preferably, in S1, the material of the conductive foil includes at least one of copper, aluminum, silver, and nickel.
Preferably, in S1, the welding manner is spot welding or seam welding.
Has the advantages that:
firstly, welding a conductive foil and one side of a flexible current collector to form a small welding unit, namely a pole piece 1, then compounding a plurality of small units together, and continuously welding on a welding spot of the original pole piece 1 in a pressure compounding manner to obtain a pole piece 2 in which the flexible current collector and the conductive foil are adjacently arranged; when the pole piece 2 is welded, the proper welding pressure and the welding tooth depth are adjusted by adopting a proper welding method, so that the problem of cracking of a welding point 1 caused by secondary welding can be avoided, and the influence on the welding strength of the pole piece 1 is small; the composition of a plurality of welding units can be realized, double-side conduction is realized, and the overlarge internal resistance at two sides is avoided; the welding method avoids the defects of insufficient overcurrent capacity caused by directly welding the multilayer composite current collector, and also avoids the problems of foil waste, over-thick lugs and core deformation caused by double-layer foil wrap welding.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A method of welding a flexible current collector, comprising the steps of:
s1, attaching a flexible current collector (12 microns thick, 10mm long and 22mm wide) and an aluminum foil (12 microns thick, 15mm long and 22mm wide) and carrying out ultrasonic spot welding to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1, and the shape of the welding spot 1 is in a spaced point shape;
s2, cutting the plurality of pole pieces 1 into the same size, stacking the pole pieces together, performing ultrasonic spot welding at the positions of welding points 1 to obtain pole pieces 2, and performing ultrasonic welding on the pole pieces 2 and aluminum lugs outside the battery, wherein flexible current collectors in the pole pieces 2 are arranged adjacent to aluminum foils, the welding pressure is 40PSI, and the depth of welding teeth is 1.5mm.
Example 2
A method of welding a flexible current collector, comprising the steps of:
s1, attaching a flexible current collector (10 microns thick and 15mm wide) and an aluminum foil (12 microns thick and 20mm wide) and performing roll welding to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1, and the welding spot 1 is in a continuous strip shape;
s2, cutting a plurality of pole pieces 1 into the same size, stacking the pole pieces together, carrying out ultrasonic spot welding at the positions of welding points 1 to obtain pole pieces 2, and carrying out ultrasonic welding on the pole pieces 2 and aluminum lugs outside the battery, wherein flexible current collectors in the pole pieces 2 are arranged adjacent to aluminum foils, the welding pressure is 45PSI, and the welding tooth depth is 1.3mm.
Example 3
A method of welding a flexible current collector, comprising the steps of:
s1, attaching a flexible silver-plated composite current collector (10 micrometers thick and 15mm wide) and an aluminum foil (12 micrometers thick and 20mm wide) and performing roll welding to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1, and the welding spot 1 is in a continuous strip shape;
s2, cutting the plurality of pole pieces 1 into pieces with the width of 20mm, stacking the pieces together, carrying out ultrasonic spot welding at the positions of welding points 1 to obtain pole pieces 2, and carrying out ultrasonic welding on the pole pieces 2 and aluminum lugs outside the battery, wherein flexible current collectors in the pole pieces 2 are arranged adjacent to aluminum foils, the welding pressure is 40PSI, and the depth of welding teeth is 1.5mm.
Example 4
A method of welding a flexible current collector, comprising the steps of:
s1, attaching a flexible current collector (6.5 mu m thick and 18mm wide) and a copper foil (6 mu m thick and 22mm wide) and performing roll welding to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1, and the welding spot 1 is in a continuous strip shape;
s2, cutting the plurality of pole pieces 1 into pieces with the width of 20mm, stacking the pieces together, carrying out ultrasonic spot welding at the positions of welding points 1 to obtain pole pieces 2, and carrying out ultrasonic welding on the pole pieces 2 and copper lugs outside the battery, wherein flexible current collectors in the pole pieces 2 are arranged adjacent to copper foils, the welding pressure is 35PSI, and the depth of welding teeth is 1mm.
Comparative example
A method of welding a flexible current collector, comprising the steps of:
s1, sequentially overlapping and placing a copper foil 1 (6 mu m thick and 22mm wide), a flexible current collector (6.5 mu m thick and 15mm wide) and a copper foil 2 (6 mu m thick and 22mm wide), and then performing roll welding to obtain a pole piece 1; cutting the pole piece 1 into pieces of 20mm, and then ultrasonically welding the pole piece with an external copper lug.
The resistance of the welded pole pieces of examples 1-4 and comparative example was measured and the results are shown in the table below.
| Resistance (RC) | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example |
| R1(mΩ) | 18 | 16 | 15 | 6 | 8 |
| R2(mΩ) | 20 | 18 | 16 | 14 | 15 |
Remarking: the measured data are measured by a daily BT3554 portable internal resistance instrument, and the obtained data are average values.
From the results of the above table, it can be seen that the difference between the internal resistances of example 4 and the comparative example is not large, but example 4 saves half of the welding foil, and the present invention can reduce the amount of the welding foil while keeping the internal resistance from increasing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A welding method of a flexible current collector is characterized by comprising the following steps:
s1, attaching and welding a conductive foil to one side of a flexible current collector to obtain a pole piece 1, wherein a welding spot 1 is formed on the pole piece 1;
s2, stacking a plurality of pole pieces 1 together, welding again at the positions of welding points 1 to obtain pole pieces 2, and then welding the pole pieces 2 with lugs outside the battery; the flexible current collectors in the pole pieces 2 are arranged adjacent to the conductive foil.
2. The welding method of the flexible current collector as claimed in claim 1, wherein in S1, the shape of the welding spot 1 is a continuous strip or a spaced point.
3. The welding method of the flexible current collector as claimed in claim 1 or 2, wherein in S2, the welding mode is ultrasonic welding, the welding pressure is greater than 30PSI, and the depth of the welding tooth is less than 3mm.
4. The welding method of the flexible current collector as claimed in claim 1 or 2, wherein in S1, the flexible current collector comprises: the conductive coating is attached to the surface of the supporting layer.
5. The method for welding the flexible current collector as claimed in claim 4, wherein the support layer has a thickness of 0.1-20 μm.
6. The method for welding the flexible current collector as claimed in claim 4, wherein the thickness of the conductive plating layer is 0.1-10 μm.
7. The welding method of the flexible current collector as claimed in claim 1, wherein in S1, the material of the conductive foil comprises at least one of copper, aluminum, silver and nickel.
8. The welding method of the flexible current collector as claimed in claim 1, wherein in S1, the welding mode is spot welding or roll welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559542.8A CN111769289B (en) | 2020-06-18 | 2020-06-18 | Welding method of flexible current collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559542.8A CN111769289B (en) | 2020-06-18 | 2020-06-18 | Welding method of flexible current collector |
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| Publication Number | Publication Date |
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| CN111769289A CN111769289A (en) | 2020-10-13 |
| CN111769289B true CN111769289B (en) | 2023-04-07 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535773A (en) * | 2021-10-28 | 2022-05-27 | 万向一二三股份公司 | Ultrasonic welding device and ultrasonic welding method |
| CN114700604A (en) * | 2022-03-18 | 2022-07-05 | 江阴纳力新材料科技有限公司 | Ultrasonic welding method for tabs |
| WO2023174410A1 (en) * | 2022-03-18 | 2023-09-21 | 江阴纳力新材料科技有限公司 | Tab ultrasonic welding method and tab welding device |
| CN114709424A (en) * | 2022-04-21 | 2022-07-05 | 合肥国轩高科动力能源有限公司 | Method for manufacturing low-resistance current collector |
| CN115832634A (en) * | 2022-06-17 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Negative electrode plate, preparation method thereof, secondary battery comprising negative electrode plate and electric device comprising negative electrode plate |
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