CN113059260A - Welding process of negative pole tab of cylindrical lithium ion battery - Google Patents
Welding process of negative pole tab of cylindrical lithium ion battery Download PDFInfo
- Publication number
- CN113059260A CN113059260A CN202110165829.7A CN202110165829A CN113059260A CN 113059260 A CN113059260 A CN 113059260A CN 202110165829 A CN202110165829 A CN 202110165829A CN 113059260 A CN113059260 A CN 113059260A
- Authority
- CN
- China
- Prior art keywords
- welding
- tab
- lithium ion
- ion battery
- negative pole
- Prior art date
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- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 127
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 14
- 239000010937 tungsten Substances 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 239000011889 copper foil Substances 0.000 claims description 8
- UNRNJMFGIMDYKL-UHFFFAOYSA-N aluminum copper oxygen(2-) Chemical compound [O-2].[Al+3].[Cu+2] UNRNJMFGIMDYKL-UHFFFAOYSA-N 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a welding process of a cathode tab of a cylindrical lithium ion battery, which comprises the following steps: s1, preparing a cathode tab made of pure copper and a welding needle made of metal tungsten for a welding head; and S2, butting the negative pole tab with the steel shell, and welding the joint of the negative pole tab and the steel shell through a welding head of a welding pin. The lithium ion battery charging and discharging performance can be improved, so that safety accidents are reduced, and the difficulty of a welding process cannot be increased.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a welding process of a negative pole tab of a cylindrical lithium ion battery.
Background
The tab of the lithium ion battery is a metal conductor leading out the positive and negative electrodes from the battery core, and is the contact point of the positive and negative electrode tabs of the battery during charging and discharging.
The negative pole tab and the steel shell need to be welded in the welding process of the negative pole tab, enough heat is needed in the welding process, and the difference of different metal melting points is considered, namely the welding process is difficult.
At present, the positive electrode tab of the electrode is made of aluminum (Al) material, and the negative electrode tab of the lithium ion battery is generally made of nickel-plated steel belt, pure nickel belt and copper-nickel composite material. However, nickel metal is expensive, which is not favorable for reducing the manufacturing cost of the product, and the electrical resistivity of the steel strip and the nickel sheet is high, so that the temperature of the negative electrode tab is too high when the battery is charged and discharged with large current, which may cause safety accidents.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a welding process of a cathode tab of a cylindrical lithium ion battery, which can improve the charge and discharge performance of the lithium ion battery to reduce safety accidents and can not improve the difficulty of the welding process.
The purpose of the invention is realized by adopting the following technical scheme:
the welding process of the cathode tab of the cylindrical lithium ion battery is characterized by comprising the following steps of:
s1, preparing a cathode tab made of pure copper and a welding needle made of metal tungsten for a welding head;
and S2, butting the negative pole lug with a steel shell, and welding the joint of the negative pole lug and the steel shell through a welding head of the welding pin.
Furthermore, the welding body of the welding needle is made of an aluminum oxide copper material.
Furthermore, a welding head of the welding needle is in a round table structure, the diameter of the welding head is 1.2-1.7mm, and the diameter of the welding body is 2.3-2.7 mm.
Further, in step S2, when the joint of the negative electrode tab and the steel shell is welded by the welding head of the welding pin, the joint of the negative electrode tab and the steel shell is welded twice in a constant voltage welding manner, wherein the voltage for the first welding is controlled to be between 2.0V and 4.0V, the duration of welding is controlled to be between 2.0 ms and 4.0ms, the voltage for the second welding is controlled to be between 2.0V and 4.0V, and the duration of welding is controlled to be between 2.0 ms and 4.0 ms.
Further, the voltage of the first welding is controlled between 2.5V and 3.5V, the duration of the welding is controlled between 2.5 ms and 3.0ms, the voltage of the second welding is controlled between 3.0V and 3.5V, and the duration of the welding is controlled between 2.5 ms and 3.5 ms.
Further, the width of the negative pole tab is between 3 and 4mm, and the thickness of the negative pole tab is between 0.08 and 0.15 mm.
Further, in step S1, the negative electrode tab is welded to the copper foil base material by ultrasonic welding.
Compared with the prior art, the invention has the beneficial effects that:
1. the cathode tab is made of pure copper, and the characteristic of low resistivity of pure copper is utilized to ensure that the lithium ion battery generates less heat and dissipates heat quickly during high-rate charge and discharge work, so that the lithium ion battery can work safely. Meanwhile, the pure copper negative pole tab generates less heat due to small internal resistance, so that the cold welding problem is easily caused when the negative pole tab is welded with the steel shell, namely, the nugget is deviated, the welding work is completed by adopting the welding head made of metal tungsten, the cold welding phenomenon is avoided by utilizing the high heat yield characteristic of the metal tungsten, and the nugget generated between the negative pole tab and the steel shell is centered so as to improve the connection strength; in addition, the welding head made of metal tungsten is not easy to deform and wear, and the service life of the welding needle is prolonged.
2. The welding body of the welding pin is made of the aluminum oxide copper material, the manufacturing cost of the welding body is reduced compared with expensive metal tungsten, and the resistivity of the aluminum oxide copper is far lower than that of the metal tungsten, so that unnecessary heat generated by the welding pin is avoided, and heat loss is reduced.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
It will be understood that when an element is referred to as being "secured to" 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 be present. As used herein, "vertical," "horizontal," "left," "right," and similar expressions are for purposes of illustration only and do not represent the only embodiments.
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 welding process of the cathode tab of the cylindrical lithium ion battery in a preferred embodiment of the invention comprises the following steps:
and S1, preparing a cathode tab made of pure copper and a welding needle made of metal tungsten material for manufacturing the welding head, wherein the welding body of the welding needle is made of aluminum oxide copper material, and the welding body of the welding needle and the welding head of the welding needle are integrally formed so that the welding needle forms a part. The negative electrode tab and the copper foil substrate (wherein, the copper foil substrate is a pole piece of the battery) are welded in an ultrasonic welding mode, and it can be understood that the melting points of the negative electrode tab made of pure copper and the copper foil substrate are the same or similar, so that the welding can be realized through ultrasonic welding. It should be added here that the welding of the copper foil substrate is an essential step of the welding process of the negative electrode tab, and the negative electrode tab is equivalent to a bridge, and one part of the negative electrode tab needs to be welded with the copper foil substrate, and the other part needs to be welded with the steel shell, so that the copper foil substrate is welded on the negative electrode tab, and the steel shell is welded on the negative electrode tab.
And S2, butting the negative pole tab with the steel shell, and welding the joint of the negative pole tab and the steel shell through a welding head of a welding pin. When the joint of the negative pole lug and the steel shell is welded by a welding head of a welding needle, the joint of the negative pole lug and the steel shell is welded twice in a constant voltage welding mode, wherein the voltage for the first welding is controlled to be 2.0-4.0V, the continuous welding time is controlled to be 2.0-4.0ms, impurities on a welding surface are removed through the first welding, and the welding effect is improved; and then, carrying out second welding, wherein the voltage of the second welding is controlled to be between 2.0 and 4.0V, and the continuous welding time is controlled to be between 2.0 and 4.0ms, so as to form a required nugget to fix the negative pole lug and the steel shell together. Preferably, the voltage of the first welding is controlled between 2.5 and 3.5V, the duration welding time is controlled between 2.5 and 3.0ms, the voltage of the second welding is controlled between 3.0V and 3.5V, and the duration welding time is controlled between 2.5 and 3.5 ms.
The cathode tab is made of pure copper, and the characteristic of low resistivity of pure copper is utilized to ensure that the lithium ion battery generates less heat and dissipates heat quickly during high-rate charge and discharge work, so that the lithium ion battery can work safely. Meanwhile, the pure copper negative pole tab generates less heat due to small internal resistance, so that the cold welding problem is easily caused when the negative pole tab is welded with the steel shell, namely, the nugget is deviated, the welding work is completed by adopting the welding head made of metal tungsten, the cold welding phenomenon is avoided by utilizing the high heat yield characteristic of the metal tungsten, and the nugget generated between the negative pole tab and the steel shell is centered so as to improve the connection strength; in addition, the welding head made of metal tungsten is not easy to deform and wear, and the service life of the welding needle is prolonged. Furthermore, the welding body of the welding pin is made of the aluminum oxide copper material, compared with expensive metal tungsten, the manufacturing cost of the welding body is reduced, and the resistivity of the aluminum oxide copper is far lower than that of the metal tungsten, so that unnecessary heat generated by the welding pin is avoided, and the heat loss is reduced.
Preferably, in order to improve the welding effect, the welding head of the welding needle is in a circular truncated cone structure, the diameter of the welding head is between 1.2 and 1.7mm, and the diameter of the welding body is between 2.3 and 2.7 mm. And the width of the negative pole tab is between 3 and 4mm, and the thickness of the negative pole tab is between 0.08 and 0.15 mm.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. The welding process of the cathode tab of the cylindrical lithium ion battery is characterized by comprising the following steps of:
s1, preparing a cathode tab made of pure copper and a welding needle made of metal tungsten for a welding head;
and S2, butting the negative pole lug with a steel shell, and welding the joint of the negative pole lug and the steel shell through a welding head of the welding pin.
2. The welding process of the negative pole tab of the cylindrical lithium ion battery as claimed in claim 1, wherein the welding body of the welding pin is made of aluminum oxide copper.
3. The welding process of the negative electrode tab of the cylindrical lithium ion battery according to claim 2, wherein the welding head of the welding needle is in a circular truncated cone structure, the diameter of the welding head is between 1.2 mm and 1.7mm, and the diameter of the welding body is between 2.3 mm and 2.7 mm.
4. The welding process of the negative electrode tab of the cylindrical lithium ion battery according to claim 1, wherein in the step S2, when the joint of the negative electrode tab and the steel case is welded by the welding head of the welding pin, the joint of the negative electrode tab and the steel case is welded twice by constant voltage welding, wherein the voltage of the first welding is controlled to be between 2.0V and 4.0V, the duration of welding is controlled to be between 2.0 ms and 4.0ms, the voltage of the second welding is controlled to be between 2.0V and 4.0V, and the duration of welding is controlled to be between 2.0 ms and 4.0 ms.
5. The welding process of the negative electrode tab of the cylindrical lithium ion battery according to claim 4, wherein the voltage of the first welding is controlled to be between 2.5 and 3.5V, the duration of the welding is controlled to be between 2.5 and 3.0ms, the voltage of the second welding is controlled to be between 3.0V and 3.5V, and the duration of the welding is controlled to be between 2.5 and 3.5 ms.
6. The welding process of the negative pole tab of the cylindrical lithium ion battery according to claim 1, wherein the width of the negative pole tab is between 3 mm and 4mm, and the thickness of the negative pole tab is between 0.08 mm and 0.15 mm.
7. The welding process of the negative electrode tab of the cylindrical lithium ion battery according to claim 1, wherein in step S1, the negative electrode tab is welded to the copper foil substrate by ultrasonic welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110165829.7A CN113059260A (en) | 2021-02-06 | 2021-02-06 | Welding process of negative pole tab of cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110165829.7A CN113059260A (en) | 2021-02-06 | 2021-02-06 | Welding process of negative pole tab of cylindrical lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113059260A true CN113059260A (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110165829.7A Pending CN113059260A (en) | 2021-02-06 | 2021-02-06 | Welding process of negative pole tab of cylindrical lithium ion battery |
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| CN (1) | CN113059260A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649684A (en) * | 2021-08-24 | 2021-11-16 | 江西迪比科股份有限公司 | Ultrasonic welding equipment and process for bottom welding of cylindrical lithium ion battery cathode |
-
2021
- 2021-02-06 CN CN202110165829.7A patent/CN113059260A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649684A (en) * | 2021-08-24 | 2021-11-16 | 江西迪比科股份有限公司 | Ultrasonic welding equipment and process for bottom welding of cylindrical lithium ion battery cathode |
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