CN114619144A - Laser welding method for button battery - Google Patents
Laser welding method for button battery Download PDFInfo
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- CN114619144A CN114619144A CN202210180980.2A CN202210180980A CN114619144A CN 114619144 A CN114619144 A CN 114619144A CN 202210180980 A CN202210180980 A CN 202210180980A CN 114619144 A CN114619144 A CN 114619144A
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- negative electrode
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- 238000003466 welding Methods 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 38
- 229910052759 nickel Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 abstract description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 210000005069 ears Anatomy 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005538 encapsulation 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Classifications
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
-
- 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
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention belongs to the field of lithium batteries, and particularly relates to a button battery laser welding method, which comprises the following steps: finishing winding of a bare cell, wherein the bare cell is provided with two convex positive and negative electrode lugs; the negative electrode shell is welded with the negative electrode tab of the bare cell by laser; the positive electrode shell and the positive electrode lug of the naked electric core are welded by laser, and the shell and the lug are welded together by the laser welding; the welding area of the negative pole lug and the negative pole shell is in an open spiral line shape; the welding area of the positive pole lug and the positive pole shell is in an open spiral line shape. The welding method is simple, the welding effect is good, and the bearable tension value is the largest, namely the welding firmness is the best.
Description
Technical Field
The invention belongs to the field of lithium batteries, and particularly relates to a button battery laser welding method.
Background
The lithium ion button battery has many excellent performances, such as long cycle life, high energy density, small self-discharge, light weight, small volume and the like, and is widely applied to various consumer electronics fields. The common structure of button cell is the structure of steel-clad encapsulation, it is inside including naked electric core, positive pole shell, negative pole shell and the insulating layer that has plastic construction who moulds plastics on the negative pole shell constitute, draw forth positive ear and negative pole ear on the naked electric core respectively, the positive pole is aluminium utmost point ear generally, the negative pole is nickel utmost point ear generally, positive and negative ear generally links to each other with the steel-clad casing through resistance welding or laser welding's form, the energy ratio of laser welding is more stable, the welding precision is high, high speed, and the thermal strain to the work piece is less, so generally weld casing and utmost point ear through laser welding's form, laser welding welds through various modes, and different welding modes are along with welded stability is different, the casing is different with the relative welding firm degree of utmost point ear, it is different specifically to demonstrate in the welding pulling force value.
Disclosure of Invention
The invention aims to provide a thought of a button battery laser welding mode, wherein positive and negative electrode lugs are used as current conductors, bodies of a large shell and a small shell are used as current conductors of external current, the shell is generally made of stainless steel materials including 316/304 and the like, the shell and the metal lugs are welded together in a laser welding mode, the lug materials and the welding mode are different, the represented welding tension is different, and the welding effect is different. The button cell has a small welding area of about 2mm by 2mm, and needs to be welded on the area, so that different welding modes are needed to ensure that no cold solder (weak welding) or over solder (penetration welding) is formed.
A button cell laser welding method comprises the following steps: finishing winding of a bare cell, wherein the bare cell is provided with two convex positive and negative electrode lugs; the negative electrode shell is welded with the negative electrode tab of the bare cell by laser; the positive electrode shell and the positive electrode lug of the naked electric core are welded by laser, and the shell and the lug are welded together by the laser welding; the welding area of the negative pole tab and the negative pole shell is in an open spiral line shape; the welding area of the positive pole lug and the positive pole shell is in an open spiral line shape.
Further, a fixing device is adopted to clamp the positive electrode or negative electrode shell in a manner that the opening direction is opposite to the inner side of the tab, the direction of the tab is parallel to the bottom surface of the positive electrode or negative electrode shell before welding, and when welding is started, the tab pressing device presses the tab from the outer side of the tab to enable the tab to be fully contacted with the inner bottom of the positive electrode or negative electrode shell; laser sequentially penetrates through the hollow structure of the lug pressing device and the outer side of the lug, so that the lug is fused with the anode or the cathode.
Furthermore, the lug pressing device is of a hollow structure which is a square structure and is 3mm by 3mm in size.
Furthermore, the welding area of the positive electrode lug and the positive electrode shell is 2 mm/2 mm, and the welding area of the negative electrode lug and the negative electrode shell is 2 mm/2 mm.
Furthermore, the minimum diameter of the spiral line is 0.2mm, the maximum diameter is 2mm, the distance between the spiral lines is 0.2-0.5 mm, and welding is carried out from the inside to the outside of the spiral line during welding.
Further, utmost point ear is located the both sides of naked electric core, is 90 with naked electric core side, and the angle between two utmost point ears also is 90.
Furthermore, the tab of the positive plate is made of aluminum, and the tab of the negative plate is made of nickel.
Furthermore, the tabs are respectively welded on the positive plate and the negative plate through ultrasound.
Further, the laser welding employs an air-cooled nanosecond laser.
The invention also provides a button battery which is prepared by the button battery laser welding method.
According to the invention, under the same laser power, different welding modes are adopted to weld the stainless steel material and the nickel or aluminum material on the area with the length and width of about 2mm by 2mm, and under different welding modes, the formation of insufficient welding (infirm welding) and the formation of over welding (through welding) are not ensured. The invention uses different welding modes, including point shape, linear, circular, rectangular, matrix and open spiral. In addition, a tension meter is used for carrying out tension test on different welding modes, and the welding strength, namely the welding firmness, is verified. In the final result, the welding mode which shows the spiral shape is optimal, the welding effect is also optimal, and the tension value is maximal.
Advantageous effects
The invention provides a new idea, which is particularly applied to welding of a lug and a steel shell structure of a button cell, high-precision welding is carried out on an area of about 2mm x 2mm, different welding modes are used for welding, and the shell can be effectively welded. The method is simple, the effect is good, and the practical use significance is large.
Drawings
FIG. 1 shows a laser welding method for button cell;
FIG. 2 shows a laser welding process for button cells;
fig. 3 structure of bare cell;
FIG. 4 is the welding of the negative electrode nickel tab and the small shell;
and 5, welding the positive electrode aluminum lug with the large shell.
1. A naked battery cell; 2. a negative electrode nickel tab; 3. a positive electrode aluminum tab; 4. a battery negative electrode casing; 5. the welding area of the negative electrode nickel tab and the battery negative electrode shell is formed; 6. a battery positive electrode case; 7. the welding area of the negative electrode nickel tab and the battery negative electrode shell is formed.
Detailed Description
Example 1
In order to make the technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with specific reference to the accompanying drawings, which are obviously some embodiments of the present invention.
A laser welding method for button batteries comprises the following steps:
1. with positive plate, negative pole piece and diaphragm twine into naked electric core with the mode of coiling, the naked electric core 1 of completion of coiling has two projections at both sides face and approximately is less than the utmost point ear of shell utensil diameter 2mm length, and two utmost point ears are negative pole nickel utmost point ear 2 and anodal aluminium utmost point ear 3 respectively, and two convex utmost point ears personally submit 90 with the both sides of naked electric core 1, and two convex utmost point ears appear in the both sides of naked electric core, also are 90 in the space between two utmost point ears. The electrode lug used by the positive plate is made of aluminum and is welded on the electrode plate through ultrasonic welding, and the direction of the electrode lug and the length direction of the electrode plate are 90 degrees. The pole lug used by the negative pole piece is made of nickel and is also welded on the pole piece through ultrasonic welding, and the direction of the pole lug forms 90 degrees with the length direction of the pole piece;
2. the bare cell is firstly welded with a negative electrode shell 4 (small shell), an air-cooled nanosecond laser is used, the small shell is clamped by a fixing device and is opposite to the inner side of a pole lug (the pole lug faces the direction of the bare cell) in the opening direction, the direction of the pole lug is parallel to the bottom surface of the shell before welding, when the welding is started, a pole lug pressing device presses the pole lug from the outer side of the pole lug (the direction deviating from the direction of the bare cell) until the pole lug is fully contacted with the bottom shell at the inner side of the shell, the pole lug pressing device is of a hollow structure, the hollow structure is of a square structure, the size of the hollow structure is 3mm, laser penetrates through the hollow structure, the laser sequentially penetrates through the hollow structure and the outer side of the pole lug of the pressing device, the pole lug and the shell are fused together, the welding area 5 of the negative electrode nickel pole lug and the battery negative electrode shell is of the square structure, the length and the width of the negative electrode shell are respectively 2mm and 2mm, the welding mode is of a helical line structure, and the minimum diameter of the helical line is 0.2mm, the maximum diameter is 2mm, the distance between the spiral lines is 0.2-0.5 mm, welding is carried out from inside to outside during welding, and the welding of the small shell is completed;
3. secondly, welding a bare cell welded with a negative electrode lug and a positive electrode shell 6 (a large shell), using an air-cooled nanosecond laser, as the welding mode of a small shell, clamping the large shell by a fixing device to enable the opening direction to be opposite to the inner side of the lug (the lug faces the direction of the bare cell), enabling the lug to be parallel to the bottom surface of the shell before welding, when welding is started, a lug pressing device presses the lug from the outer side of the lug (the direction deviating from the direction of the bare cell) to enable the lug to be fully contacted with a bottom shell at the inner side of the shell, the lug pressing device is of a hollow structure, the hollow structure is of a square structure, the size is 3mm, laser passes through the hollow structure, the laser sequentially passes through the hollow structure of the pressing device, the outer side of the lug is fused with the shell, a welding area 7 of the negative electrode nickel lug and the negative electrode shell is of the square structure, the length and the width of the welding area are respectively 2mm, and the welding mode is of the spiral line structure, the minimum diameter of the spiral line is 0.2mm, the maximum diameter is 2mm, the distance between the spiral lines is 0.2-0.5 mm, welding is carried out from inside to outside during welding, and welding of the large shell is completed.
According to the invention, under the same laser power, different welding modes are adopted to weld the stainless steel material and the nickel or aluminum material in an area of 2mm by 2mm, and under different welding modes, the formation of insufficient welding (infirm welding) and the formation of over welding (through welding) are not ensured. The invention uses different welding modes, including point shape, linearity, circle, rectangle, matrix and open spiral type, to test the actual effect of each mode, the open spiral type welding mode is the best, the welding effect is also the best, the tension value is the largest, the welding mode is shown in figure 1, the welding tension value is shown in table 1.
TABLE 1
Point mode: the welding effect is simple and convenient, but the risk of insufficient welding exists, namely the welding is not firm, so that the subsequent battery performance is not good, the tension value is small in a plurality of modes, the mean value of the tension of the nickel electrode lug is 0.383kgf, and the mean value of the tension of the aluminum electrode lug is 0.131 kgf.
Linear mode: the welding effect is better, the average value of the pull force of the nickel electrode tab is 0.534kgf, and the average value of the pull force of the aluminum electrode tab is 0.204 kgf;
the circular mode is as follows: the welding effect is better, the average value of the pull force of the nickel pole lug is 0.536kgf, the average value of the pull force of the aluminum pole lug is 0.283kgf, but the closed-loop welding mode can form a head-to-tail welding mode, the heat accumulation nearby a welding area expands the welding area, and the material which is directly cut into a circular inner part and a circular outer part is adopted;
the rectangular mode: the welding effect is better, the average value of the pull force of the nickel pole lug is 0.577kgf, the average value of the pull force of the aluminum pole lug is 0.313kgf, but the closed-loop welding mode can form a head-to-tail welding mode, the heat accumulation near the welding area expands the welding area, and the material which is directly cut into the rectangular inner part and the rectangular outer part is divided into two parts;
matrix mode: the welding effect is better, the mean value of the tension of the nickel pole lug is 0.918kgf, and the mean value of the tension of the aluminum pole lug is 0.396 kgf;
helical line type: the welding effect is best, the average value of the nickel electrode lug tension is 1.045kgf, the average value of the aluminum electrode lug tension is 0.510kgf, the welding tension is the largest among a plurality of modes, and the gathered heat can be quickly dissipated by an open-loop welding mode without forming a cutting mode.
The spiral welding mode has the best welding effect and the largest tension value among several welding modes.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only one of the specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A button cell laser welding method is characterized by comprising the following steps: finishing winding of a bare cell, wherein the bare cell is provided with two convex positive and negative electrode lugs; the negative electrode shell is welded with a negative electrode tab of the bare cell in a laser mode; the positive electrode shell and the positive electrode lug of the naked electric core are welded by laser, and the shell and the lug are welded together by the laser welding; the welding area of the negative pole lug and the negative pole shell is in an open spiral line shape; the welding area of the positive pole lug and the positive pole shell is in an open spiral line shape.
2. The button battery laser welding method according to claim 1, characterized in that a fixing device is adopted to clamp the positive electrode or negative electrode shell in a manner that the opening direction is opposite to the inner side of the tab, the direction of the tab is parallel to the bottom surface of the positive electrode or negative electrode shell before welding, and when welding is started, the tab pressing device presses the tab from the outer side of the tab to enable the tab to be fully contacted with the inner bottom shell of the positive electrode or negative electrode shell; and laser sequentially penetrates through the hollow structure of the lug pressing device and the outer side of the lug to fuse the lug with the positive electrode or the negative electrode.
3. The button cell laser welding method according to claim 1, wherein the tab pressing device is of a hollow structure, and the hollow structure is of a square structure and is 3mm by 3mm in size.
4. The button cell laser welding method according to claim 1, wherein the welding area of the positive electrode tab and the positive electrode shell is 2mm x 2mm, and the welding area of the negative electrode tab and the negative electrode shell is 2mm x 2 mm.
5. The button cell laser welding method according to claim 1, wherein the minimum diameter of the spiral wire is 0.2mm, the maximum diameter of the spiral wire is 2mm, the pitch between the spiral wires is 0.2-0.5 mm, and the welding is performed from the inside to the outside of the spiral wire.
6. The button cell laser welding method according to claim 1, wherein the tabs are located on two sides of the bare cell and form an angle of 90 degrees with the side face of the bare cell, and the angle between the two tabs is also 90 degrees.
7. The button battery laser welding method according to claim 1, wherein the tab of the positive plate is made of aluminum, and the tab of the negative plate is made of nickel.
8. The button cell laser welding method according to claim 1, wherein the tabs are respectively welded to the positive plate and the negative plate by ultrasonic welding.
9. The button cell laser welding method according to claim 1, wherein an air-cooled nanosecond laser is used for the laser welding.
10. A button battery is characterized by being prepared by the button battery laser welding method according to claims 1-9.
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| CN202210180980.2A CN114619144A (en) | 2022-02-25 | 2022-02-25 | Laser welding method for button battery |
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| CN202210180980.2A CN114619144A (en) | 2022-02-25 | 2022-02-25 | Laser welding method for button battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117961296A (en) * | 2024-03-29 | 2024-05-03 | 佛山科学技术学院 | Laser welding method and device for lithium battery tab |
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| CN113067061A (en) * | 2021-03-11 | 2021-07-02 | 惠州亿纬锂能股份有限公司 | Lithium ion battery and preparation method thereof |
| CN215815984U (en) * | 2021-08-23 | 2022-02-11 | 珠海冠宇电池股份有限公司 | Battery and electronic product |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117961296A (en) * | 2024-03-29 | 2024-05-03 | 佛山科学技术学院 | Laser welding method and device for lithium battery tab |
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