CN110961783A - Sealing method of ultrathin stainless steel shell - Google Patents
Sealing method of ultrathin stainless steel shell Download PDFInfo
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- CN110961783A CN110961783A CN201811142470.6A CN201811142470A CN110961783A CN 110961783 A CN110961783 A CN 110961783A CN 201811142470 A CN201811142470 A CN 201811142470A CN 110961783 A CN110961783 A CN 110961783A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 54
- 239000010935 stainless steel Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000007789 sealing Methods 0.000 title claims abstract description 30
- 238000003466 welding Methods 0.000 claims abstract description 111
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 24
- 125000006850 spacer group Chemical group 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a sealing method of an ultrathin stainless steel shell, which comprises the following steps: step 1: assembling the ultrathin stainless steel shell and the cover plate, wherein an overlapping area of a flange edge of the ultrathin stainless steel shell and the cover plate forms an area to be welded; step 2: the flange edge and the cover plate of the ultrathin stainless steel shell are pressed and fixed by using a clamp; and step 3: selecting welding equipment, wherein the welding equipment comprises a laser, the laser adopts an output waveform of a modulation pulse mode, and the power of the laser is 150-300W; and 4, step 4: setting parameters, wherein the welding peak power value of welding equipment is set to be 100-150W, the duty ratio is 8% -15%, and the light emitting frequency is 0-5000 HZ; and 5: setting a welding track, wherein the welding track starts at the corner of a to-be-welded area and forms a closed loop along the counterclockwise direction; step 6: and (5) completing welding and carrying out postwelding detection. The invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency.
Description
Technical Field
The invention belongs to the technical field of material processing, and particularly relates to a sealing method of an ultrathin stainless steel shell.
Background
The ultrathin stainless steel shell has the advantages of high strength, good corrosion resistance, easiness in processing, light weight and the like, and has a very wide application prospect in the field of packaging of lithium batteries and fuel cells. As shown in fig. 1, the middle of the ultra-thin stainless steel casing has an inwardly concave square groove, and the periphery of the ultra-thin stainless steel casing has an outwardly extending flange edge, and corners of the flange edge are in arc transition. For the sealing of the ultrathin stainless steel shell, a laser welding mode is mainly adopted at present. The laser welding has the advantages of good forming quality, small heat affected zone, small deformation of workpieces, small subsequent processing amount, high flexibility and the like, and is very suitable for welding and forming metal sheets.
At present, the laser welding method of the metal sheet mainly comprises a continuous welding mode and a pulse welding mode. In the continuous welding mode, the heat input quantity of the heat conduction welding mode and the deep fusion welding mode is very large, so that a workpiece is seriously deformed during welding, and a lithium battery with large deformation cannot accept electronic products with high precision requirements. In the pulse welding mode, although the heat input is low, the output precision is not enough under the output condition of low peak power, and the requirement of ultra-thin plate welding cannot be met; in addition, in the pulse mode, the frequency of the laser is limited, and a high welding speed cannot be achieved.
Disclosure of Invention
In view of the above, the present invention provides a method for sealing an ultra-thin stainless steel case.
In order to achieve the purpose, the invention provides the following technical scheme: the invention discloses a sealing method of an ultrathin stainless steel shell, which comprises the following steps:
step 1: assembling the ultrathin stainless steel shell and the cover plate, wherein an overlapping area of a flange edge of the ultrathin stainless steel shell and the cover plate forms an area to be welded;
step 2: the flange edge and the cover plate of the ultrathin stainless steel shell are pressed and fixed by using a clamp;
and step 3: selecting welding equipment, wherein the welding equipment comprises a laser, the laser adopts an output waveform of a modulation pulse mode, and the power of the laser is 150-300W;
and 4, step 4: setting parameters, wherein the welding peak power value of welding equipment is set to be 100-150W, the duty ratio is 8% -15%, and the light emitting frequency is 0-5000 HZ;
and 5: setting a welding track, wherein the welding track starts at the corner of a to-be-welded area and forms a closed loop along the counterclockwise direction;
step 6: and (5) completing welding and carrying out postwelding detection.
Further, in step 1, a square groove and a flat flange edge are formed in the middle of the ultrathin stainless steel shell by adopting a stamping method, and a cover plate covers the groove and is connected with the flange edge in an overlapping mode to form the area to be welded.
Further, in step 2, the clamp comprises a cushion block and a pressing block arranged above the cushion block, a shell accommodating cavity is arranged in the middle of the cushion block, and a through hole is formed in the middle of the pressing block corresponding to the shell accommodating cavity; the square groove of ultra-thin stainless steel casing holds the intracavity, the flange is set up the casing holds the top border in chamber, and pass through the briquetting compresses tightly flange and apron fixedly.
Further, gaps are kept between the lower side surface and two side surfaces of the square groove of the shell and the inner wall of the shell accommodating cavity, and the other two side surfaces of the square groove of the shell are in contact with the inner wall of the shell accommodating cavity; and the cushion block is provided with a clearance groove, a protective gas inlet and a protective gas outlet which are communicated with the housing accommodating cavity.
Furthermore, the clearance groove is a step-shaped opening and is arranged above the inner wall of the housing accommodating cavity which is in contact with the side surface of the square groove of the housing; the protective gas inlet is arranged on the cushion block along the vertical direction and is communicated with the shell accommodating cavity; the protective gas outlet is arranged on the cushion block along the horizontal direction and penetrates through the inner wall of the shell accommodating cavity contacted with the side surface of the square groove; and a push block is also arranged in the cushion block along the horizontal direction.
Furthermore, the welding equipment also comprises a transmission optical fiber, a laser emitting head and a moving platform; the laser device is connected with a laser emitting head through a transmission optical fiber, the clamp, the shell to be welded and the cover plate are placed on the moving platform, and the laser emitting head is arranged above the moving platform along the vertical direction; the core diameter of the transmission optical fiber is 50-100 um; the focal length of a collimating lens in the laser emitting head is 100-250 mm, and the focal length of a focusing lens is 100-250 mm; the laser emitting head is provided with a coaxial blowing device.
Further, laser instrument power is 150W, transmission fiber core footpath is 50um, and the collimating mirror focus in the laser emitting head is 250mm, and focusing mirror focus is 150 mm.
Further, the welding peak power value of the welding equipment is set at 110W, the duty ratio is 10%, and the light emitting frequency is 1800 HZ.
Further, in step 4, the parameter setting further includes: the welding speed is 0-100 mm/s; the defocusing amount is-0.5 to +0.5 mm; the air flow of the front side is 8L/min, and the air flow of the back side is 8L/min.
Further, the welding speed is 50mm/s, and the defocusing amount is 0 mm.
The invention has the beneficial effects that: the invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a perspective view of an ultra-thin stainless steel case of the present invention.
Fig. 2 is a sectional view of the ultra-thin stainless steel case and cover plate of the present invention after they are assembled.
Fig. 3 is a perspective view of a jig used in the sealing method of an ultra-thin stainless steel case according to the present invention.
Fig. 4 is a cross-sectional view of the clamp of fig. 3.
Fig. 5 is a schematic view of a welding apparatus.
Fig. 6 is a waveform diagram of laser modulation pulse adopted by the sealing method of the ultrathin stainless steel shell.
FIG. 7 is a schematic diagram of the welding trace of the sealing method of the ultra-thin stainless steel case of the present invention.
Fig. 8 is an appearance view of a weld obtained by the sealing method of the ultra-thin stainless steel case according to the present invention.
Fig. 9 is a sectional view of a weld obtained by the sealing method of the ultra-thin stainless steel case according to the present invention.
In the figure, 1 is a shell, 11 is a square groove, 12 is a flange edge, 2 is a cover plate, 3 is a clamp, 4 is welding equipment, 30 is a cushion block, 31 is a pressing block, 32 is a shell accommodating cavity, 33 is a clearance groove, 34 is a shielding gas inlet, 35 is a through hole, 36 is a pushing block, 41 is a laser, 42 is a transmission optical fiber, 43 is a laser emitting head, and 44 is a moving platform.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely illustrative of some, but not all, of the embodiments of the invention, and that the preferred embodiments of the invention are shown in the drawings. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first implementation mode comprises the following steps: the invention discloses a sealing method of an ultrathin stainless steel shell 1, which aims at the structure of the shell 1 shown in figure 1, wherein the middle part of the shell is provided with an inwards concave square groove 11, the periphery of the shell is provided with an outwards extending flange edge 12, and the corner of the flange edge 12 is in arc transition. The sealing method comprises the following steps: step 1: the ultra-thin stainless steel case 1 and the cover plate 2 are assembled, as shown in fig. 2, and the overlapped area of the flange 12 of the ultra-thin stainless steel case 1 and the cover plate 2 forms an area to be welded. In this embodiment, the cover plate 2 covers the opening formed by the square groove 11 of the housing 1 for sealing, and the shape and size of the cover plate 2 are matched with the overall shape and size of the upper end face of the housing 1, that is, after assembly, when the cover plate 2 covers the housing 1, the edge of the cover plate 2 is just flush with the outer edge of the flange 12, and penetration welding is performed in the overlapping area of the cover plate 2 and the flange 12, so as to realize sealing.
Step 2: and (3) pressing and fixing the flange edge 12 of the ultrathin stainless steel shell 1 and the cover plate 2 by using a clamp.
And step 3: and selecting the welding equipment 4, wherein the welding equipment 4 comprises a laser 41, the laser 41 adopts an output waveform of a modulation pulse mode, and the power of the laser 41 is 150-300W. By modulating the laser in a pulse mode, high-quality and high-efficiency welding of the ultrathin stainless steel shell 1 can be realized.
And 4, step 4: setting parameters, setting the welding peak power value of the welding equipment 4 at 100-150W, setting the duty ratio at 8-15% and setting the light emitting frequency at 0-5000 HZ.
And 5: a welding track is provided which starts at the corner of the area to be welded and forms a closed loop in the counter-clockwise direction.
Step 6: and (5) completing welding and carrying out postwelding detection.
The invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency. Practice shows that the stainless steel ultrathin shell 1 manufactured by the method has good quality of the welding line and high production efficiency.
Specifically, as shown in fig. 2, in step 1, a square groove 11 and a flat flange 12 are formed in the middle of the ultra-thin stainless steel shell 1 by a stamping method. When assembled, the cover plate 2 covers the groove and is connected with the flange 12 in an overlapping manner to form a region to be welded, i.e. the region indicated by reference character a in the figure.
In step 2, as shown in fig. 3 and 4, the jig 3 includes a spacer 30 and a pressing block 31 disposed above the spacer 30, a housing accommodating chamber 32 is provided in the middle of the spacer 30, a through hole 35 is provided in the middle of the pressing block 31 corresponding to the housing accommodating chamber 32, and a laser beam b passes through the through hole 35 from above to perform welding. During welding, the square groove 11 of the ultrathin stainless steel shell 1 is accommodated in the shell accommodating cavity 32, the flange edge 12 is erected on the upper edge of the shell accommodating cavity 32, and the flange edge 12 and the cover plate 2 are pressed and fixed through the pressing block 31.
Further, a gap is maintained between the lower side surface and two side surfaces of the square recess 11 of the housing 1 and the inner wall of the housing accommodating chamber 32, and the other two side surfaces of the square recess 11 of the housing 1 are in contact with the inner wall of the housing accommodating chamber 32. The spacer 30 is provided with a clearance groove 33, a shielding gas inlet 34, and a shielding gas outlet, which are communicated with the housing accommodating chamber 32. The clearance groove 33 is a step-shaped opening, and the clearance groove 33 is arranged above the inner wall of the shell accommodating cavity 32 which is in contact with the side surface of the square groove 11 of the shell 1; the shielding gas inlet 34 is arranged on the cushion block 30 along the vertical direction and is communicated with the shell accommodating cavity 32; the shielding gas outlet is provided on the spacer 30 in the horizontal direction and penetrates the inner wall of the housing accommodating chamber 32 which is in contact with the side surface of the square groove 11. The clearance groove 33 and the shielding gas inlet 34 are used for introducing shielding gas, forming a shielding effect on the back of the welding seam and finally discharging the shielding gas through the shielding gas outlet. The pad 30 is also provided with a push block 36 along the horizontal direction, in the embodiment, only two side surfaces of the shell 1 are contacted with the pad 30, the push block 36 is contacted with the other two side surfaces, and the end part of the push block 36 is abutted against the shell 1 to achieve the positioning function.
As shown in fig. 5, the welding apparatus 4 further includes a transmission fiber 42, a laser emitting head 43, and a moving platform 44. The laser 41 is connected with a laser emitting head 43 through a transmission optical fiber 42, the fixture 3, the shell 1 to be welded and the cover plate 2 are placed on a moving platform 44, and the laser emitting head 43 is arranged above the moving platform 44 along the vertical direction. The core diameter of the transmission optical fiber 42 is 50-100 um; the focal length of a collimating lens in the laser emitting head 43 is 100-250 mm, and the focal length of a focusing lens is 100-250 mm; the laser emitting head 43 is provided with a coaxial blowing device.
Fig. 6 shows an output waveform of the laser 41 supporting the modulated pulse mode in this embodiment, with time on the abscissa and in ms; the ordinate is power, in W. P in FIG. 6 is welding peak power, the range of the peak power P is 100-150W, T1 in FIG. 6 is laser emitting time, T2 is laser stopping time, T1+ T2 is a light emitting period, and T1/(T1+ T2) is a duty ratio. In the present embodiment, the welding peak power value of the welding apparatus 4 is preferentially set at 110W; the duty ratio is 8% -15%; the light-emitting frequency is 0-5000 HZ.
In step 4, the parameter setting further includes: the welding speed is 0-100 mm/s; the defocusing amount is-0.5 to +0.5 mm; the air flow of the front side is 8L/min, and the air flow of the back side is 8L/min.
As shown in fig. 7, in the present embodiment, the welding locus starts at the corner of the region to be welded, i.e., the weld start position indicated in fig. 7, the welding locus forms a closed loop counterclockwise along the region to be welded and the trajectory line matches the contour line of the flange 12, and the weld end position is as shown in fig. 7. The initial corner of the welding track can effectively reduce the overlapping length of the welding seam.
The second embodiment: the invention discloses a sealing method of an ultrathin stainless steel shell 1, which aims at the structure of the shell 1 shown in figure 1, wherein the middle part of the shell 1 is provided with an inwards concave square groove 11, the periphery of the shell is provided with an outwards extending flange edge 12, the corner of the flange edge 12 is in arc transition, and the thickness of the shell 1 is 0.08 mm. The sealing method comprises the following steps: step 1: the ultra-thin stainless steel case 1 and the cover plate 2 are assembled, as shown in fig. 2, and the overlapped area of the flange 12 of the ultra-thin stainless steel case 1 and the cover plate 2 forms an area to be welded. In the present embodiment, the cover plate 2 covers the opening formed by the square groove 11 of the housing 1 for sealing, and the shape and size of the cover plate 2 are matched with the overall shape and size of the upper end face of the housing 1, that is, after assembly, when the cover plate 2 covers the housing 1, the edge of the cover plate 2 is just flush with the outer edge of the flange 12, and penetration welding is performed in the overlapping area of the cover plate 2 and the flange 12.
Step 2: and (3) pressing and fixing the flange edge 12 of the ultrathin stainless steel shell 1 and the cover plate 2 by using a clamp.
And step 3: a welding device 4 is selected, the welding device 4 comprising a laser 41, the laser 41 employing an output waveform in a modulated pulse mode, the laser 41 having a power of 200W. By modulating the laser in a pulse mode, high-quality and high-efficiency welding of the ultrathin stainless steel shell 1 can be realized.
And 4, step 4: setting parameters, wherein the welding peak power value of the welding equipment 4 is set at 150W, the duty ratio is 10%, and the light emitting frequency is 1800 HZ.
And 5: a welding track is provided which starts at the corner of the area to be welded and forms a closed loop in the counter-clockwise direction.
Step 6: and (5) completing welding and carrying out postwelding detection.
The invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency. Practice shows that the stainless steel ultrathin shell 1 manufactured by the method has good quality of the welding line and high production efficiency.
Specifically, as shown in fig. 2, in step 1, a square groove 11 and a flat flange 12 are formed in the middle of the ultra-thin stainless steel shell 1 by a stamping method. When assembled, the cover plate 2 covers the groove and is connected with the flange 12 in an overlapping manner to form a region to be welded, i.e. the region indicated by reference character a in the figure.
In step 2, as shown in fig. 3 and 4, the jig 3 includes a spacer 30 and a pressing block 31 disposed above the spacer 30, a housing accommodating chamber 32 is provided in the middle of the spacer 30, a through hole 35 is provided in the middle of the pressing block 31 corresponding to the housing accommodating chamber 32, and a laser beam b passes through the through hole 35 from above to perform welding. During welding, the square groove 11 of the ultrathin stainless steel shell 1 is accommodated in the shell accommodating cavity 32, the flange edge 12 is erected on the upper edge of the shell accommodating cavity 32, and the flange edge 12 and the cover plate 2 are pressed and fixed through the pressing block 31.
Further, a gap is maintained between the lower side surface and two side surfaces of the square recess 11 of the housing 1 and the inner wall of the housing accommodating chamber 32, and the other two side surfaces of the square recess 11 of the housing 1 are in contact with the inner wall of the housing accommodating chamber 32. The spacer 30 is provided with a clearance groove 33, a shielding gas inlet 34, and a shielding gas outlet, which are communicated with the housing accommodating chamber 32. The clearance groove 33 is a step-shaped opening, and the clearance groove 33 is arranged above the inner wall of the shell accommodating cavity 32 which is in contact with the side surface of the square groove 11 of the shell 1; the shielding gas inlet 34 is arranged on the cushion block 30 along the vertical direction and is communicated with the shell accommodating cavity 32; the shielding gas outlet is provided on the spacer 30 in the horizontal direction and penetrates the inner wall of the housing accommodating chamber 32 which is in contact with the side surface of the square groove 11. The clearance groove 33 and the shielding gas inlet 34 are used for introducing shielding gas, forming a shielding effect on the back of the welding seam and finally discharging the shielding gas through the shielding gas outlet. The pad 30 is also provided with a push block 36 along the horizontal direction, in the embodiment, only two side surfaces of the shell 1 are contacted with the pad 30, the push block 36 is contacted with the other two side surfaces, and the end part of the push block 36 is abutted against the shell 1 to achieve the positioning function.
As shown in fig. 5, the welding apparatus 4 further includes a transmission fiber 42, a laser emitting head 43, and a moving platform 44. The laser 41 is connected with a laser emitting head 43 through a transmission optical fiber 42, the fixture 3, the shell 1 to be welded and the cover plate 2 are placed on a moving platform 44, and the laser emitting head 43 is arranged above the moving platform 44 along the vertical direction. The core diameter of the transmission fiber 42 is 50 um; the focal length of a collimating lens in the laser emitting head 43 is 250mm, and the focal length of a focusing lens is 150 mm; the laser emitting head 43 is provided with a coaxial blowing device.
In the present embodiment, the power of the laser 41 is preferably 200W, the core diameter of the transmission fiber 42 is preferably 80um, the focal length of the collimator lens in the laser emitting head 43 is preferably 150mm, and the focal length of the focusing lens is preferably 200 mm. Fig. 6 shows an output waveform of the laser 41 supporting the modulation pulse mode in this embodiment, where P in fig. 6 is a welding peak power, the range of the peak power P is 100 to 150W, T1 in fig. 6 is a laser emitting time, T2 is a laser stopping time, T1+ T2 is a light emitting period, and T1/(T1+ T2) is a duty ratio. In the present embodiment, the welding peak power value of the welding apparatus 4 is preferentially set at 110W; the duty cycle is preferably 10%; the light extraction frequency is preferably 1800 HZ.
In step 4, the parameter setting further includes: the welding speed is preferably 50 mm/s; the defocusing amount is preferably 0 mm; the air flow of the front side is 8L/min, and the air flow of the back side is 8L/min.
As shown in fig. 7, in the present embodiment, the welding locus starts at the corner of the region to be welded, the welding locus is formed counterclockwise along the region to be welded, and the locus matches the contour line of the flange 12. The initial corner of the welding track can effectively reduce the overlapping length of the welding seam.
In the present embodiment, for a housing 1 having a thickness of 0.08mm, the average power of the laser 41 is 150W, the core diameter of the transmission fiber 42 is 50um, the focal length of the collimator lens in the laser emitting head 43 is 250mm, the focal length of the focusing lens is 150mm, the flow rate of the front blowing gas is 8L/min, and the flow rate of the back blowing gas is 8L/min. The welding speed is 50mm/s, the peak power P of the output laser is 110W, the duty ratio is 10%, the light emitting frequency is 1800Hz, and the defocusing amount is 0 mm.
In the embodiment, the waveform of the modulation pulse mode is adopted, the laser peak power is 110w, the duty ratio is 10%, and the welding speed is greatly improved to 50mm/s, so that the heat input is reduced, the appearance of the welding seam is more stable, the size of the welding spot is more uniform, and the appearance of the welding seam is as shown in fig. 8. In addition, the optical configuration adopted by the invention, namely the diameter of the optical fiber core is 50um, the focal length of the collimating mirror is 250mm, the focal length of the focusing mirror is 150mm, the size of the formed welding point is moderate, the section of the formed welding line is more reasonable, the depth of fusion is close to the thickness of the plate, and the welding is not penetrated, so that the better strength and the better sealing performance are formed, and the appearance of the product is not influenced, as shown in figure 9. In addition, the invention adopts coaxial direct blowing protective gas, the flow is moderate (8L/min), the obtained protective effect is better, the surface of the welding line is smooth and has no oxidation, as shown in figure 8.
The invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency. And filling helium into the shell 1, sealing and standing for a period of time, detecting the helium leakage condition, and detecting that no helium leakage condition exists after detection, which indicates that the welding seam track has excellent sealing performance.
The invention has the beneficial effects that: the invention adopts the laser of the modulation pulse mode, can effectively reduce the heat input, reduce the welding deformation, and can wait for a larger welding speed because of the very high frequency.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments described above. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
Claims (10)
1. A sealing method of an ultrathin stainless steel shell is characterized by comprising the following steps:
step 1: assembling the ultrathin stainless steel shell and the cover plate, wherein an overlapping area of a flange edge of the ultrathin stainless steel shell and the cover plate forms an area to be welded;
step 2: the flange edge and the cover plate of the ultrathin stainless steel shell are pressed and fixed by using a clamp;
and step 3: selecting welding equipment, wherein the welding equipment comprises a laser, the laser adopts an output waveform of a modulation pulse mode, and the power of the laser is 150-300W;
and 4, step 4: setting parameters, wherein the welding peak power value of welding equipment is set to be 100-150W, the duty ratio is 8% -15%, and the light emitting frequency is 0-5000 HZ;
and 5: setting a welding track, wherein the welding track starts at the corner of a to-be-welded area and forms a closed loop along the counterclockwise direction;
step 6: and (5) completing welding and carrying out postwelding detection.
2. The method for sealing an ultra-thin stainless steel case according to claim 1, wherein in step 1, the ultra-thin stainless steel case is formed with a square groove and a flat flange at the middle by stamping, and a cover plate covers the groove and is overlapped with the flange to form the region to be welded.
3. The method for sealing an ultrathin stainless steel shell as claimed in claim 2, wherein in step 2, the clamp comprises a cushion block and a pressing block arranged above the cushion block, a shell accommodating cavity is arranged in the middle of the cushion block, and a through hole is arranged in the middle of the pressing block corresponding to the shell accommodating cavity; the square groove of ultra-thin stainless steel casing holds the intracavity, the flange is set up the casing holds the top border in chamber, and pass through the briquetting compresses tightly flange and apron fixedly.
4. The sealing method of an ultra-thin stainless steel case according to claim 3, wherein a gap is maintained between the lower side and two sides of the square recess of the case and the inner wall of the case receiving chamber, and the other two sides of the square recess of the case are in contact with the inner wall of the case receiving chamber; and the cushion block is provided with a clearance groove, a protective gas inlet and a protective gas outlet which are communicated with the housing accommodating cavity.
5. The method for sealing an ultra-thin stainless steel case according to claim 5, wherein the clearance groove is a stepped opening, and the clearance groove is provided above an inner wall of the case accommodating chamber that is in contact with a side surface of the square groove of the case; the protective gas inlet is arranged on the cushion block along the vertical direction and is communicated with the shell accommodating cavity; the protective gas outlet is arranged on the cushion block along the horizontal direction and penetrates through the inner wall of the shell accommodating cavity contacted with the side surface of the square groove; and a push block is also arranged in the cushion block along the horizontal direction.
6. The method of sealing an ultra-thin stainless steel enclosure of claim 1, wherein the welding device further comprises a transmission fiber, a laser emitting head, and a motion stage; the laser device is connected with a laser emitting head through a transmission optical fiber, the clamp, the shell to be welded and the cover plate are placed on the moving platform, the laser emitting head is arranged above the moving platform along the vertical direction, and the core diameter of the transmission optical fiber is 50-100 microns; the focal length of a collimating lens in the laser emitting head is 100-250 mm, and the focal length of a focusing lens is 100-250 mm; the laser emitting head is provided with a coaxial blowing device.
7. The method of claim 6, wherein the laser power is 150W, the diameter of the transmission fiber core is 50um, the focal length of the collimating lens in the laser emitting head is 250mm, and the focal length of the focusing lens is 150 mm.
8. The method of claim 1, wherein the welding device has a welding peak power value of 110W, a duty ratio of 10% and an optical frequency of 1800 HZ.
9. The method of sealing an ultra-thin stainless steel case according to claim 1, wherein in step 4, the parameter setting further comprises: the welding speed is 0-100 mm/s; the defocusing amount is-0.5 to +0.5 mm; the air flow of the front side is 8L/min, and the air flow of the back side is 8L/min.
10. The sealing method of an ultra-thin stainless steel case according to claim 9, wherein the welding speed is 50mm/s and the defocus amount is 0 mm.
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| CN115347282A (en) * | 2021-05-14 | 2022-11-15 | 中创新航科技股份有限公司 | Battery, battery pack, and battery manufacturing method |
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