CN114147348A - Laser welding method for sealing nail - Google Patents
Laser welding method for sealing nail Download PDFInfo
- Publication number
- CN114147348A CN114147348A CN202111587528.XA CN202111587528A CN114147348A CN 114147348 A CN114147348 A CN 114147348A CN 202111587528 A CN202111587528 A CN 202111587528A CN 114147348 A CN114147348 A CN 114147348A
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- welding
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- welded
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- 238000003466 welding Methods 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007789 sealing Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000004927 fusion Effects 0.000 abstract description 8
- 230000035515 penetration Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 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
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
-
- 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
- B23K26/24—Seam 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
Abstract
The invention discloses a laser welding method of a sealing nail. The laser welding method of the seal nail comprises the following steps: welding of a sealing nail is carried out through welding equipment with a laser, a welding track is arranged on a region to be welded, and closed-loop welding is carried out in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode through a control box, the welding power of the laser is 0.5-1 KW, and the welding frequency after modulation is 80-100 Hz. According to the invention, the laser is modulated into the high-frequency pulse laser, and the laser is emitted in a small-pulse-width high-frequency mode, so that the heat input in the welding process is effectively reduced, and the defect that a large number of air holes are formed at the joint of the head and the tail of the circular welding seam when the electrolyte remained in the liquid injection hole is heated and decomposed to generate gas under the action of the high-energy laser beam is avoided. Meanwhile, the welding device can be adapted to higher welding speed and has high production efficiency. The appearance is good after welding, and the penetration and the fusion width are high in consistency and high in weld size stability.
Description
Technical Field
The invention belongs to the field of battery laser welding, and particularly relates to a laser welding method of a sealing nail.
Background
In recent years, the new energy automobile industry is developed vigorously, and the power battery is used as a core part of the new energy automobile and plays a decisive role in the performance of the whole automobile. The last welding process of sealed nail laser welding as square aluminum hull battery manufacturing, the goodness and the efficiency of product are crucial, in case welding defect appears will directly lead to the battery to scrap, cause huge manpower, material resources, the cost waste that all processes of anterior segment invested.
Because of adopting continuous fiber laser to directly carry out butt welding, along with the increase of heat input volume, the downthehole electrolyte of annotating liquid can be heated and decomposed out gas under the effect of high energy laser beam, leads to adding the airtight back cavity internal gas pressure of glue nail and sealed nail too high, forms a large amount of gas pocket welding defects at circular welding seam head and the tail combination handing-over department easily, influences the leakproofness of battery and leads to scrapping. Therefore, the sealing nail and the top cover liquid injection port are welded by adopting a YAG pulse laser in a butt joint mode, the welding speed is generally within 3-8 mm/s, and the production efficiency is low.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems in the prior art. Therefore, the invention provides a laser welding method of the sealing nail.
A first aspect of the present invention provides a method of laser welding of a seal nail, comprising the steps of:
welding of a sealing nail is carried out through welding equipment with a laser, a welding track is arranged on a region to be welded, and closed-loop welding is carried out in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode through a control box, the welding power of the laser is 0.5-1 KW, and the welding frequency after modulation is 80-100 Hz.
The technical scheme of the laser welding method of the sealing nail at least has the following beneficial effects:
according to the invention, the laser continuously emitted by the optical fiber continuous laser is modulated into the high-frequency pulse laser in a modulation mode, and the laser is emitted in a small-pulse-width high-frequency mode, so that the heat input in the welding process is effectively reduced, and the defect that a large number of air holes are formed at the joint of the head and the tail of the circular welding seam due to the fact that the electrolyte remained in the liquid injection hole is heated and decomposed to generate gas under the action of the high-energy laser beam is avoided. Meanwhile, the sealing nail welding method is high in frequency, and can adapt to higher welding speed and high in production efficiency compared with the traditional YAG pulse laser welding method. The appearance is good after welding, and the penetration and the fusion width are high in consistency and high in weld size stability.
According to some embodiments of the present invention, the region to be welded is a region where the sealing nail and the battery case for a battery having a pour hole are formed to overlap.
According to some embodiments of the invention, the area to be welded is pressed and fixed using a jig.
According to some embodiments of the invention, the modulated welding frequency is 85 to 95 Hz.
According to some embodiments of the invention, the laser welding power is 0.75-0.95 KW.
According to some embodiments of the invention, the laser has a single welding time of 10 to 12 ms.
The applicant found that the longer the single welding time, the higher the stability, but the longer the welding time, which results, the better the single welding time of the laser is 10-12 ms.
According to some embodiments of the invention, the laser has a welding speed of 25 to 35 mm/s.
The applicant finds that the welding speed is not satisfactory when being too low, and the welded outer tube deteriorates when being too high, so that the welding speed of the laser is selected to be 25 to 35 mm/s.
According to some embodiments of the invention, the laser has a defocus amount of 0-2 mm.
The applicant finds that when the defocusing amount of the laser is 0-2 mm,
according to some embodiments of the invention, a spot diameter of a focal point of a welding head focusing lens of the laser is greater than or equal to 0.15 mm.
The applicant researches and discovers that when the diameter of a light spot is larger than or equal to 0.15mm, the weld penetration can be increased, and the stability is improved.
According to some embodiments of the present invention, there is a tack welding operation prior to setting the welding track at step S2.
According to some embodiments of the invention, the welding peak power of the pre-spot welding is set to be 250-350W, and the light is emitted in a single point.
According to some embodiments of the invention, the closed loop is a clockwise or counter-clockwise closed loop.
Drawings
FIG. 1 is a drawing showing a test of penetration and fusion width in example 1;
fig. 2 is a microscopic view of the air holes of the sealed nail prepared in comparative example 4.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
Example 1
The embodiment 1 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.8KW, the welding frequency after modulation is 90Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Example 2
The embodiment 2 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.8KW, the welding frequency after modulation is 80Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Example 3
The embodiment 3 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.8KW, the welding frequency after modulation is 85Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Example 4
The embodiment 4 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.8KW, the welding frequency after modulation is 95Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Example 5
This embodiment 5 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.8KW, the welding frequency after modulation is 100Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Example 6
The embodiment 6 provides a laser welding method for a seal nail, which includes the following steps:
pre-spot welding is carried out before welding, parameters of the pre-spot welding are set, the welding peak power of welding equipment is set to be 300W, and light is emitted from a single point; performing pre-spot welding;
welding a sealing nail by using welding equipment with a laser, setting a welding track on a region to be welded, and carrying out anticlockwise closed-loop welding in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode by using a control box, the welding power of the laser is 0.75KW, the welding frequency after modulation is 90Hz, the single welding time is 11ms, and the welding speed is 30 mm/s; the defocusing amount is 1 mm; the diameter of a light spot of a welding head focusing lens focus of the laser is equal to 0.15 mm.
Comparative example 1
Comparative example 1 provides a laser welding method of a seal nail, which is different in the manufacturing parameters and manufacturing method from example 1 in that the welding frequency after modulation is 70 Hz.
Comparative example 2
Comparative example 2 provides a laser welding method of a seal nail, which is different from example 1 in the manufacturing parameters and manufacturing method thereof in that the welding frequency after modulation is 110 Hz.
Comparative example 3
Comparative example 3 provides a laser welding method of a seal nail, which is different in the manufacturing parameters and manufacturing method from example 1 in that the laser welding power is 0.40 KW.
Comparative example 4
Comparative example 3 provides a laser welding method of a seal nail, which is different from example 1 in the manufacturing parameters and manufacturing method thereof in that the laser welding power is 1.10 KW.
Performance testing
1. And (3) testing the penetration fusion width: the melting depth is 0.5-1 mm, and the product is qualified; the melting width is qualified when the melting width is 0.5-1.6 mm; the test method comprises the following steps: after cutting the metallographic phase, observing the metallographic phase by using a microscope; the melting depth is from the top cover surface to the lowest edge of the molten pool; the fusion width is the left-right distance of the molten pool;
2. testing the number of air holes: if the number of the air holes is more than or equal to 1, the product is unqualified; the test method comprises the following steps: after welding, placing a microscope to observe whether air holes exist or not;
3. and (3) testing the dimensional stability of the welding seam: cutting the sample from the middle, and taking two metallographic data, namely 32 samples and 64 data; the CPK requirement is more than or equal to 1.67, and the CPK is MIN [ (the allowable upper limit-the sample mean)/3/the sample standard deviation; (sample mean-allowable lower limit)/3/sample standard deviation ]; the allowable upper and lower limits of the sealing nail fusion depth are 0.5-1.0 mm, the allowable upper and lower limits of the fusion width are 0.8-infinity, and NG means unqualified.
All examples and comparative examples passed the above performance tests and the results are shown in table 1:
TABLE 1 data for examples and comparative examples
As shown in FIG. 1, FIG. 1 is a test chart of penetration and fusion width of example 1, and after cutting the metal phase, the penetration was observed by a microscope to be 0.7 mm; the melt width was 1.35 mm.
As shown in fig. 2, fig. 2 is a diagram of the pores observed under a microscope in comparative example 4, and comparative example 4 has one pore.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method of laser welding of a seal pin, comprising the steps of:
welding of a sealing nail is carried out through welding equipment with a laser, a welding track is arranged on a region to be welded, and closed-loop welding is carried out in the region to be welded according to the welding track, wherein the laser is modulated into a high-frequency pulse mode through a control box, the welding power of the laser is 0.5-1 KW, and the welding frequency after modulation is 80-100 Hz.
2. The method for laser welding of seal nails according to claim 1, wherein the modulated welding frequency is 85 to 95 Hz.
3. The method for laser welding of seal nails according to claim 1, wherein the laser welding power is 0.75-0.95 KW.
4. The method for laser welding of seal nails according to claim 1, wherein the laser has a single welding time of 10 to 12 ms.
5. The method for laser welding of seal nails according to claim 1, wherein the laser has a welding speed of 25 to 35 mm/s.
6. The method for laser welding of seal nails according to claim 1, wherein the defocusing amount of the laser is 0 to 2 mm.
7. The method for laser welding of seal nails according to claim 1, wherein the spot diameter of the focal point of the welding head focusing lens of the laser is 0.15mm or more.
8. The method of laser welding of seal nails according to claim 1, wherein there is a tack welding operation before setting the welding trace at step S2.
9. The method for laser welding of seal nails according to claim 8, wherein the welding peak power of the tack welding is set at 250-350W, and the light is emitted from a single point.
10. The method for laser welding of seal nails according to claim 1, wherein the closed loop is a clockwise or counterclockwise closed loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111587528.XA CN114147348A (en) | 2021-12-23 | 2021-12-23 | Laser welding method for sealing nail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111587528.XA CN114147348A (en) | 2021-12-23 | 2021-12-23 | Laser welding method for sealing nail |
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| CN114147348A true CN114147348A (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111587528.XA Pending CN114147348A (en) | 2021-12-23 | 2021-12-23 | Laser welding method for sealing nail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116604188A (en) * | 2023-07-17 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Welding method, welding device, battery monomer, battery and electricity utilization device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016128704A2 (en) * | 2015-02-09 | 2016-08-18 | Spi Lasers Uk Limited | A weld |
| CN107175407A (en) * | 2017-06-28 | 2017-09-19 | 大族激光科技产业集团股份有限公司 | Laser welding apparatus and its welding method |
| CN107331804A (en) * | 2017-06-29 | 2017-11-07 | 大族激光科技产业集团股份有限公司 | A kind of electrokinetic cell, its sealing nail and its welding method |
| CN109590621A (en) * | 2018-12-28 | 2019-04-09 | 大族激光科技产业集团股份有限公司 | A kind of cell sealing nail welding equipment |
| CN112658477A (en) * | 2020-12-14 | 2021-04-16 | 北京航星机器制造有限公司 | Pulse double-beam laser welding method |
-
2021
- 2021-12-23 CN CN202111587528.XA patent/CN114147348A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016128704A2 (en) * | 2015-02-09 | 2016-08-18 | Spi Lasers Uk Limited | A weld |
| CN107175407A (en) * | 2017-06-28 | 2017-09-19 | 大族激光科技产业集团股份有限公司 | Laser welding apparatus and its welding method |
| CN107331804A (en) * | 2017-06-29 | 2017-11-07 | 大族激光科技产业集团股份有限公司 | A kind of electrokinetic cell, its sealing nail and its welding method |
| CN109590621A (en) * | 2018-12-28 | 2019-04-09 | 大族激光科技产业集团股份有限公司 | A kind of cell sealing nail welding equipment |
| CN112658477A (en) * | 2020-12-14 | 2021-04-16 | 北京航星机器制造有限公司 | Pulse double-beam laser welding method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116604188A (en) * | 2023-07-17 | 2023-08-18 | 宁德时代新能源科技股份有限公司 | Welding method, welding device, battery monomer, battery and electricity utilization device |
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Address after: 518110 301, Building B, Comlong Science Park, Guansheng 5th Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province (one photo multiple site enterprise) Applicant after: Haimuxing Laser Technology Group Co.,Ltd. Address before: 518000 No. 26, 101 Ring Road south of Guanzi street, Longhua District, Shenzhen, Guangdong Applicant before: SHENZHEN HYMSON LASER INTELLIGENT EQUIPMENTS Co.,Ltd. |