CN113210844A - Process method for enhancing sealing performance of welded shell of lithium ion battery based on supersonic laser deposition technology - Google Patents
Process method for enhancing sealing performance of welded shell of lithium ion battery based on supersonic laser deposition technology Download PDFInfo
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- CN113210844A CN113210844A CN202110382490.6A CN202110382490A CN113210844A CN 113210844 A CN113210844 A CN 113210844A CN 202110382490 A CN202110382490 A CN 202110382490A CN 113210844 A CN113210844 A CN 113210844A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 49
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008021 deposition Effects 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 27
- 238000005516 engineering process Methods 0.000 title claims abstract description 26
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 63
- 239000000843 powder Substances 0.000 claims abstract description 44
- 239000011248 coating agent Substances 0.000 claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000005728 strengthening Methods 0.000 claims abstract description 5
- 230000003116 impacting effect Effects 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims abstract description 3
- 238000004093 laser heating Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 239000012159 carrier gas Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 7
- 229910000679 solder Inorganic materials 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 3
- 239000007921 spray Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011530 conductive current collector Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- 229920006255 plastic film Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
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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
- B23K26/20—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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
Abstract
A process method for enhancing the sealing performance of a shell of a lithium ion battery after welding based on a supersonic laser deposition technology comprises the following steps: fixing a shell and a cover plate of the lithium ion battery on a welding fixture according to the installation sequence, and welding the shell and the cover plate into an integrated structure by adopting a horizontal laser welding mode; sealing and strengthening the welded junction by adopting a supersonic laser deposition technology, selecting a semiconductor laser capable of emitting a rectangular light spot, spraying the powder spot by a powder feeding mechanism in the rectangular light spot, moving the powder feeding mechanism and the laser synchronously in the processing process, and impacting a welding seam, a shell and a cover plate after the powder is accelerated in the powder feeding mechanism to form a compact coating under the action of laser heating; the invention improves the fusion property of the solder and the matrix, and simultaneously adopts the supersonic laser deposition technology to prepare a coating with good sealing property on the solder and the matrix so as to improve the sealing property of the lithium ion battery, enhance the safety and prolong the cycle life of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of lithium ion battery manufacturing, in particular to a process method for enhancing the sealing performance of a shell after welding of a lithium ion battery based on a supersonic laser deposition technology.
Background
In order to solve various environmental problems caused by fossil energy, people invent a lithium ion battery which has high energy density, high voltage, good cycle performance, long service life, small self-discharge and environmental friendliness and serves as a main energy storage device of new energy, and the development of the lithium ion battery technology also brings strong power for the development of portable equipment, electric automobiles and hybrid electric automobiles. A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. During charging and discharging, Li+Intercalation and deintercalation to and from two electrodes: upon charging, Li+The lithium ion battery is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium ion batteries generally consist of the following parts: (1) the positive electrode-active substance is generally lithium manganate or lithium cobaltate, nickel cobalt lithium manganate material, the conductive current collector uses 10-20 micron thick electrolytic aluminum foil; (2) the diaphragm is a specially formed polymer film, and the film has a microporous structure, so that lithium ions can freely pass through the film, but electrons cannot pass through the film; (3) the negative electrode is graphite or carbon with a structure similar to graphite, and the conductive current collector is electrolytic copper foil with the thickness of 7-15 microns; (4) organic electrolyte, a carbonate solvent in which lithium hexafluorophosphate is dissolved, and a gel electrolyte is used as a polymer; (5) the battery shell is divided into a steel shell (square is rarely used), an aluminum shell, a nickel-plated iron shell (used for a cylindrical battery), an aluminum-plastic film (flexible package) and the like, and also comprises a cap of the battery and is also the leading-out end of the positive electrode and the negative electrode of the battery.
In the production process of the lithium ion battery, after a roll core is placed into a shell, the joint of a battery shell and a battery cover plate needs to be firmly welded by laser. However, in the laser welding process, laser often causes unstable welding, so that the risk of welding air leakage easily exists between the aluminum shell and the cover plate; occasionally, welding fire explosion can occur, so that a welded seam has sand holes; due to the abrasion of a welding clamp, unstable operation of a laser welding machine and other factors, the phenomena of insufficient welding, welding leakage, low welding strength and the like often occur; because battery case thickness is very thin in the welding process of small lithium cell, laser power is very little, and this just leads to laser facula temperature to hang down excessively, and casing and apron do not melt completely, are difficult to fuse each other and form the good sealed crater of leakproofness, and these drawbacks all can reduce the life of lithium cell and can cause the life safety problem even.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a process method for enhancing the sealing property of a shell after a lithium ion battery is welded based on a supersonic laser deposition technology. The method comprises the following steps: a compact coating which is uniform in thickness distribution and well bonded with a lithium ion battery shell and a cover plate is prepared at a weld joint of a lithium ion battery subjected to laser welding by adopting a supersonic laser deposition technology, and the weld joint, the lithium ion battery cover plate and the shell are softened by means of a laser used by the supersonic laser deposition technology while the coating is prepared so as to promote fusion of a welding flux and a base body and enhance the sealing property.
The technical scheme of the invention is as follows:
a process method for enhancing the sealing performance of a shell of a lithium ion battery after welding based on a supersonic laser deposition technology comprises the following steps:
(1) fixing a shell and a cover plate of the lithium ion battery on a welding fixture according to the installation sequence, and welding the shell and the cover plate into an integrated structure by adopting a horizontal laser welding mode;
in the step (1), the workpiece is a lithium ion battery, a shell and a cover plate of the workpiece are made of aluminum alloy, and the matching accuracy must be strictly ensured in the fixing process;
the size and length of the shell and the cover plate are partially changed compared with the prior lithium ion battery, and the sealing seam of the cover plate and the shell is changed from side facing to upward facing (see figure 4 in particular); the sealing port of the shell is cut inwards, and the sealing section of the cover plate is outwards protruded to form a convex shape; the mode of laser welding the shell is changed from side welding to horizontal welding;
in order to reduce the influence of laser on the thickness of the shell, an external welding wire is adopted for laser welding, the laser welding is actually an action process of converting light energy into heat energy, the laser irradiates the surface of the metal to be welded, the temperature of the metal is increased and melted to form a molten pool after the metal absorbs the light energy, and a welding seam is formed after the metal is cooled to realize welding;
the method is characterized in that a pulse laser is selected to carry out sealing welding on a cover plate and a shell, the pulse laser is mainly used for spot welding and seam welding of thin-wall metal materials within the thickness of 1mm, the welding process belongs to a heat conduction type, namely laser radiation heats the surface of a workpiece and then diffuses into the material through heat conduction, and good connection is formed between the workpieces by controlling parameters such as the waveform, the width, the peak power, the repetition frequency and the like of laser pulse;
(2) sealing and strengthening the welded junction by adopting a supersonic laser deposition technology, selecting a semiconductor laser capable of emitting a rectangular light spot, spraying the powder spot by a powder feeding mechanism in the rectangular light spot, moving the powder feeding mechanism and the laser synchronously in the processing process, and impacting a welding seam, a shell and a cover plate after the powder is accelerated in the powder feeding mechanism to form a compact coating under the action of laser heating;
in the step (2), the laser power of a semiconductor laser used for supersonic laser deposition is adjusted to be 1000w, a powder feeding mechanism is a Laval nozzle, a powder spot and a light spot are superposed, the length of a rectangular light spot is slightly larger than the diameter of the powder spot, spray powder is 316L metal powder for example, the particle size of the powder is 15-53 mu m, the spray carrier gas is nitrogen, the gas pressure is 4MPa, and the spray distance is 70 mm;
because cracks and sand holes exist in the shell and the cover plate of the lithium ion battery by laser welding, the sealing strengthening of the welded junction by the supersonic laser deposition technology is carried out after the initial laser welding sealing is finished; the light spots can preheat the matrix, soften the powder and flatten the coating; the supersonic laser deposition technology can form a layer of uniform compact coating which is well bonded with the matrix on the welding line; the laser can soften the welding seam and the matrix, the metals are fused with each other, and the sealing property is improved; the coating can produce the interpenetration of metal particles with welding seam, lithium ion battery apron and casing on the cross section, forms an organic whole.
In the invention, the principle of sealing and strengthening the crater by the supersonic laser deposition technology mainly comprises the following processes:
(a) the laser spot cleans and preheats the surface of the welding seam, the laser cleaning is used for eliminating the adverse effect of an oxide film on the surface of the welding seam on the deposited coating, and the laser preheats the welding seam to promote the combination of the coating and the welding seam, and the welding seam and the cover plate and the shell;
(b) the light spot is overlapped with the powder spot, and the deposited powder and the welding seam are synchronously heated and softened, so that the critical deposition speed of the powder is reduced, the deposition efficiency of the powder is improved, and the binding force of the coating is improved;
(c) the laser spots remelt the top area of the deposited coating, eliminate the internal pores of the coating, reduce the roughness of the surface of the coating, and the middle lower part of the coating still keeps the structure and the performance of the original powder.
In the process (a), the lens of the laser transmitter is designed based on the Fresnel focusing principle, and uniform rectangular light spots with any length-width ratio can be obtained by changing the parameters of the Fresnel lens;
the lens designed based on the Fresnel focusing principle meets the following design formula:
in the formula
(n11 is the refractive index of air at standard atmospheric pressure, n2Refractive index of lens material), uiIs the angle between the incident light of the ith facet and the optical axis FF', ui' is the included angle between the i-th prism emergent light and the optical axis FF ', F and F ' are the distances from F and F ' to the point of the optical axis O ', R is the arc curvature radius of the Fresnel lens, R is the outline radius of the spherical crown, omegai' is the angle between the normal of the incident surface of the ith prism lens and the optical axis, thetaiIs an edge of the ith edgeAn elevation angle.
In the process (a), by changing the laser power, the light beam emitted by the laser is absorbed by the pollution layers on the surfaces of the welding seam, the cover plate and the shell, and the high-energy absorption forms the plasma (unstable gas with high ionization) which expands rapidly to generate shock waves, and the shock waves enable the pollutants to be broken into fragments and removed, so that the impurity layers generated by the pretreatment laser welding are removed.
In the process (b), the powder spots are deposited on the surface by the metal powder in the Laval nozzle under the pushing of external high-pressure gas at supersonic speed, and a coating with the thickness of about 50-400 μm is formed.
In the process (c), because the deposition speeds of the powder are different in the supersonic laser deposition process, a coating with uneven thickness can be formed in the sectioning direction, the surface is rough, the coating can be softened by irradiation of the laser, the roughness of the surface of the coating is reduced, and the service performance of the lithium ion battery is improved.
The coating formed by the supersonic laser deposition has a wider width than that of the weld joint, and the coating is diffused into the weld joint, the cover plate and the shell under the action of laser to form a tightly connected whole.
The invention has the beneficial effects that: the method has the advantages that the fusion of the solder and the matrix is improved, and simultaneously, a coating with good sealing performance is prepared on the solder and the matrix by adopting a supersonic laser deposition technology, so that the sealing performance of the lithium ion battery is improved, the safety is enhanced, and the cycle life of the lithium ion battery is prolonged.
Drawings
Fig. 1 shows the structural composition of a lithium ion battery.
Fig. 2 shows a welding portion of the lithium ion battery.
FIG. 3 is a horizontal welding of the lithium ion battery weld.
FIG. 4 is a schematic view of a change from side welding to horizontal welding.
FIG. 5 is a schematic view of a horizontal weld defect.
FIG. 6 is a schematic diagram of a Fresnel focusing system; (a) a slow axis; (b) and (4) fast axis.
FIG. 7 is a schematic diagram of a Fresnel lens design; (a) a general Fresnel lens; (b) the flat plate ribs face the inner Fresnel lens.
FIG. 8 is a schematic diagram of the sealing performance of the welded lithium ion battery case improved by the supersonic laser deposition technology.
FIG. 9 is a schematic diagram of the effect of supersonic laser deposition technology on improving the sealing performance of the lithium ion battery after welding.
Detailed Description
The invention will be further illustrated by means of specific embodiments in the following description with reference to the drawings, without limiting the scope of the invention thereto.
Example 1
In this embodiment, a lithium ion battery is taken as an example, and a process method for enhancing the sealing property of a welded shell of a lithium ion battery based on a supersonic laser deposition technology is described, wherein the size of the lithium ion battery is 20mm × 70mm × 120mm, and the material of the lithium ion battery is rustproof aluminum 3003.
Referring to fig. 8, a process method for enhancing the sealing performance of a welded shell of a lithium ion battery based on a supersonic laser deposition technology specifically includes the following steps:
(1) and (4) placing the lithium ion battery shell and the cover plate into a fixture, and fixing according to the assembly sequence.
(2) Selecting a pulse laser, adjusting laser power, and performing charging (Al 1000) welding on the cover plate and the shell in a horizontal laser welding mode;
the working conditions of the pulse laser are as follows: waveform: flat-top square pulse waveform, pulse width 100 mus, peak power 1500W, repetition frequency 50, pulse laser power 1200W.
(3) Selecting a semiconductor laser capable of emitting rectangular light spots, adjusting the laser power to 1000W, adjusting a spray gun to enable a Laval nozzle to be vertical to the surface of a workpiece, and spraying powder spots on the surface of the workpiece, wherein the diameter of the powder spots is 3 mm; adjusting a laser to enable the powder spot to be located inside the rectangular light spot, wherein the length of the rectangular light spot is 6mm, and the width of the rectangular light spot is 3 mm; the nozzle and the laser move synchronously during the processing.
(4) And carrying out laser cleaning and preheating on the surface range near the to-be-sprayed deposition layer in the scanning advancing direction of the spray gun by using light spots in the moving area in front of the powder spots.
(5) The spraying powder is 316L metal powder, the particle size of the powder is 15-53 mu m, and the spraying process comprises the following steps: the carrier gas is nitrogen, the gas pressure is 4MPa, and the spraying distance is 70 mm.
(6) The spots in the area behind the powder spot soften the sprayed layer, reducing the surface roughness.
(7) Finally obtaining a coating with the thickness of 226um, compactness, good combination with a cover plate, a shell and a welding line and high sealing performance, and the deposition rate is up to 8.5m2/h。
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (5)
1. A process method for enhancing the sealing performance of a shell of a lithium ion battery after welding based on a supersonic laser deposition technology is characterized by comprising the following steps:
(1) fixing a shell and a cover plate of the lithium ion battery on a welding fixture according to the installation sequence, and welding the shell and the cover plate into an integrated structure by adopting a horizontal laser welding mode;
(2) sealing and strengthening the welded junction by adopting a supersonic laser deposition technology, selecting a semiconductor laser capable of emitting a rectangular light spot, spraying the powder spot by a powder feeding mechanism in the rectangular light spot, moving the powder feeding mechanism and the laser synchronously in the processing process, and impacting a welding seam, a shell and a cover plate after the powder is accelerated in the powder feeding mechanism to form a compact coating under the action of laser heating;
in the step (2), the laser power of the semiconductor laser is adjusted to be 1000w, the powder feeding mechanism is a Laval nozzle, the spraying powder is 316L metal powder, the particle size of the powder is 15-53 mu m, the spraying carrier gas is nitrogen, the gas pressure is 4MPa, and the spraying distance is 70 mm.
2. The process method for enhancing the tightness of the welded shell of the lithium ion battery based on the supersonic laser deposition technology as claimed in claim 1, wherein in the step (1), the shell and the cover plate of the lithium ion battery are made of aluminum alloy.
3. The process method for enhancing the sealing performance of the welded shell of the lithium ion battery based on the supersonic laser deposition technology as claimed in claim 1, wherein in the step (1), the laser welding adopts an external welding wire adding mode.
4. The process method for enhancing the sealing performance of the welded shell of the lithium ion battery based on the supersonic laser deposition technology as claimed in claim 1, wherein in the step (1), the cover plate and the shell are hermetically welded by using a pulse laser.
5. The process method for enhancing the sealing performance of the welded shell of the lithium ion battery based on the supersonic laser deposition technology as claimed in claim 1, wherein in the step (2), the diameter of the sprayed powder spot is 3mm, the sprayed powder spot is positioned inside a rectangular light spot, and the rectangular light spot has a length of 6mm and a width of 3 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115447048A (en) * | 2022-09-29 | 2022-12-09 | 东莞市纳百川电子科技有限公司 | Alloy hand mold production process and alloy hand mold structure |
| EP4169657A1 (en) * | 2021-10-22 | 2023-04-26 | Prime Planet Energy & Solutions, Inc. | Method of manufacturing secondary battery |
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Application publication date: 20210806 |