CN115464268B - Laser cleaning tab sealant process and device based on power density adjustment - Google Patents
Laser cleaning tab sealant process and device based on power density adjustment Download PDFInfo
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- CN115464268B CN115464268B CN202210934813.2A CN202210934813A CN115464268B CN 115464268 B CN115464268 B CN 115464268B CN 202210934813 A CN202210934813 A CN 202210934813A CN 115464268 B CN115464268 B CN 115464268B
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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
- B23K26/36—Removing material
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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
- B23K26/02—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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0869—Devices involving movement of the laser head in at least one axial direction
- B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
- B23K26/0884—Devices involving movement of the laser head in at least one axial direction in at least two axial directions in at least in three axial directions, e.g. manipulators, robots
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Laser Beam Processing (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a process and a device for cleaning tab sealant by laser based on power density adjustment, which are used for collecting characteristics of tab sealant to set laser power density, wherein the characteristics are one or any combination of melting point, thickness, color and position of the tab sealant; the higher the melting point, the greater the power density of the laser; the greater the thickness, the greater the power density of the laser; the higher the transmittance, the smaller the absorbance and the higher the power density; the lug sealing glue at the suspended part improves the photon energy of laser and reduces the pulse width; and the lug sealing glue at the supporting part reduces the photon energy of laser and improves the pulse width. The method and the device for removing the tab sealant by the laser realize the selective removal of the tab sealant by a purely physical method, are efficient and environment-friendly, have no chemical pollution, ensure that the tab sealant at the part which is not removed has no negative effect on the function, and have better mechanical property, conductivity and weldability.
Description
Technical Field
The invention relates to the field of laser cleaning tab sealant, in particular to a process and a device for cleaning tab sealant based on power density adjustment.
Background
The electrode lug is a component of a soft package lithium ion battery product and is a metal conductor for leading out the positive electrode and the negative electrode from the battery core. The lugs of the positive electrode and the negative electrode of the battery are contact points when the battery is charged and discharged. The positive electrode of the battery uses an aluminum (Al) material, the negative electrode uses a nickel (Ni) material, and the negative electrode also has a copper nickel-plated (Ni-Cu) material. In order to prevent short circuit fault between the metal foil tab and the aluminum plastic film during battery packaging, two tab sealing films are usually used for clamping the metal foil between the two tab sealing films, and the metal foil and the aluminum plastic film are sealed and bonded together through heating and hot melting to prevent liquid leakage. The performance of the tab sealant as a connecting part of the tab and the shell is directly related to the safety of the battery in use, and the common practice is to reserve a margin of a plurality of millimeters beyond the sealing edge of the aluminum plastic film. The tab sealant with the exposed surplus part depends on the processing precision during hot melting sealing, the width of the tab sealant is uneven, and the exposed surplus part can influence the subsequent welding process, meanwhile, the space is wasted, and more compact connection with the control circuit board can not be realized. In order to further optimize the internal space layout of 3C products, especially mobile phones, and increase the volume of the battery core so as to expand the battery capacity, an important approach is to clean the exposed surplus tab sealant in order, so that the tab and the control circuit board form more compact connection.
The tab sealant with the surplus exposed part comprises two parts and four processing surfaces, namely a suspension part on the left side and the right side and a front and back attaching part of the tab metal foil. The suspended tab sealant is unsupported and has poor flatness, and the tab sealant on the metal foil is regularly attached on the front and the back. After the heat-sealing process of the cell, the width of the surplus exposed portion of the tab sealant may be different for each sample. These physical properties determine the inability to achieve accurate and thorough cleaning using conventional hardware methods.
The laser-removed tab sealant is different from the common laser-removed technology, and the main reason is that the material properties are greatly different from region to region. The part to be processed is a very critical joint, so that the accuracy and the integrity of processing are ensured, the functionality of a processed area and an unprocessed area is ensured, and particularly, excessive heat influence is avoided, and the integrity and the tightness of tab sealant in a battery sealing area are ensured.
The conventional laser photoresist removing process cannot be used for realizing the accurate and thorough removal of the exposed tab sealant at one time by using a single laser. The main reasons include that the lug sealing glue at the suspended part can be tilted and bent by taking white glue as an example, and is thermally insulated and light-transmitting in physical property; the tab sealant attached to the metal foil has the properties of high heat conduction and high light reflection. The tab sealant is distinguished from a laminated structure of the tab sealant and the thickness determined by the laminated structure, and the tab sealant also has a single-layer, three-layer and five-layer structure, wherein the multi-layer structure comprises an intermediate framework layer, a surface hydrophilic metal modified layer and a surface hydrophilic plastic modified layer, and the mechanical properties and melting points of different layers are not completely consistent. The material of the tab sealant is divided from chemical components of the tab sealant and comprises polypropylene (PP), modified polypropylene, polyethylene naphthalate (PEN), polyphthalamide (PPA), modified polyphthalamide (PPA) and the like. The lug sealants made of different materials have different melting points, for example, the melting point of the framework layer PP is 167 ℃, the melting point of the modified PP is 135 ℃, the melting point of PEN is 265 ℃, and the melting point of PPA is 147 ℃. The colors of the lug sealing glue made of different materials are different, and the lug sealing glue is industrially divided into black glue, yellow glue and white glue, so that the difference of light absorption and light reflection characteristics is determined. For example, a Hitachi three-layer white glue comprises two layers of modified polypropylene (thickness: 25 μm) and an intermediate backbone layer polypropylene (thickness: 50 μm), the intermediate backbone layer polypropylene having a melting point 32℃higher than the melting point of the two layers of modified polypropylene.
In practice, using conventional laser de-gumming techniques, such as direct application of a single laser de-gumming process on a PCB, the tab seals on the metal foil are prone to blistering or gumming, and the bottom metal foil is prone to being scratched; the tab sealant at the suspended part is easy to deform by curling or burn by hot melting, and is difficult to obtain a neat notch. The main reason is that the photoresist removing process on the PCB only needs to consider the thickness and the area of the removed photoresist, but does not consider the specificity of the tab sealant, for example, the thermal conductivity, the mechanical property, the light absorption property, the thermal melting point, the light damage threshold and the like of the tab sealant with different positions and materials are different, so that the requirements on various optical parameters of the laser used for removing are also different.
Therefore, in order to realize accurate and thorough removal of the tab sealant, and ensure normal functionality of the unwashed part, the tab sealant with different physical properties and different areas needs to be realized by adopting different lasers or different laser process parameters.
Disclosure of Invention
In order to solve the technical problems, the invention provides a process and a device for cleaning tab sealant by laser based on power density adjustment.
The process for cleaning the tab sealant by using the laser based on power density adjustment is characterized in that the laser power density is set by collecting the characteristics of the tab sealant, and the characteristics are one or any combination of the melting point, thickness, color and position of the tab sealant; the higher the melting point, the greater the power density of the laser; the greater the thickness, the greater the power density of the laser; the higher the transmittance, the smaller the absorbance and the higher the power density; the lug sealing glue at the suspended part improves the photon energy of laser and reduces the pulse width; and the lug sealing glue at the supporting part reduces the photon energy of laser and improves the pulse width.
The lug sealant at the suspended part has poor thermal conductivity, no substrate support and good light transmittance, and is used for realizing efficient and accurate cleaning and cutting, a laser with narrow pulse, small light spot and short wavelength (namely high photon energy) is preferably used, so that the roughness of cleaning boundary can be ensured to be small, a hot melting area is small, and meanwhile, the unwashed part does not have obvious thermal deformation and hot melting glue piling. The electrode lug sealing glue on the electrode lug foil is good in heat conductivity, and the metal foil wrapped by the electrode lug sealing glue is strong in light reflection, so that the metal foil at the bottom is not damaged by laser while the electrode lug sealing glue is thoroughly removed, and a carbon dioxide laser with smaller light spots and longer wavelength (namely weak photon energy) is preferably used, so that the electrode lug sealing glue can be gasified rapidly due to higher power density, and the electrode lug metal foil cannot be damaged.
Furthermore, a carbon dioxide laser is adopted to provide laser with low photon energy and large pulse width, and the lug sealing glue at the supporting part is removed.
Further, the power of the carbon dioxide laser is 10W-300W.
Furthermore, a pulse laser is adopted to provide high photon intensity and small pulse width laser, and the lug sealing glue at the suspended part is removed.
Further, the pulse width of the pulse laser is 50fs-100ns.
Further, the wavelength of the pulse laser is 200nm-2 μm.
Further, the laser power density in unit time is set according to the distance between the cleaning area of the supporting part and the sealing edge of the battery, and the closer the cleaning area is to the sealing edge of the battery, the smaller the power density of the laser in unit time is.
Further, the power density is adjusted by adjusting the spot size of the carbon dioxide laser or the pulse laser, and the smaller the spot size is, the larger the power density is.
Further, the size of the spot size is 200nm-0.6mm.
Further, the photon energy is adjusted by adjusting the operating wavelength of the pulsed laser.
A laser washs utmost point ear sealed glue device based on power density adjusts for realizing above-mentioned laser washs utmost point ear sealed glue technology based on power density adjusts, includes: the system comprises a man-machine interaction interface, an industrial personal computer in bidirectional communication with the man-machine interaction interface, a visual positioning system connected with the industrial personal computer, a site control unit in bidirectional communication with the industrial personal computer, a laser generator connected with the site control unit, a vibration lens connected with the site control unit and the laser generator, a movable platform connected with the site control unit, and an auxiliary device connected with the movable platform, wherein the auxiliary device comprises a cartridge clip device, an air blowing device and a dust removal device.
Further, the vibration lens is a movable vibration lens and moves in the X-axis, Y-axis and Z-axis directions, the movement speed is not lower than 200mm/s, the positioning speed is not lower than 500mm/s, and the positioning accuracy is better than 30urad.
Further, the movable platform transversely moves or overturns in the X-axis, Y-axis and Z-axis directions, and the positioning precision of the displacement movement is better than 0.5 millimeter.
Further, the cartridge clip device is used for fixing the tab foil in the laser cleaning process.
The process and the device for cleaning the tab sealant by the laser based on power density adjustment have the following beneficial technical effects:
1. the pole ear sealant is removed by a pure physical method, so that the pole ear sealant has no chemical pollution and is environment-friendly;
2. the tab sealant at the part not removed is ensured to have no negative effect on functions, and the tab sealant is characterized by less glue piling, small heat affected zone, no material deterioration and no material denaturation;
3. the exposed tab after the tab sealant is removed has good mechanical properties, electrical conductivity and solderability.
4. Is not restricted by the material, thickness, size and shape of the tab sealant, and greatly reduces the production reject ratio;
5. and the automatic production greatly improves the production efficiency, and is suitable for selectively removing the mass industrialized pole ear sealant.
Drawings
FIG. 1 is a schematic diagram of a battery cell with positive and negative lugs, which is prepared by a process for cleaning a lug sealant by laser based on power density adjustment;
FIG. 2 is a schematic view of a process for cleaning tab sealant at a support part by using laser based on power density adjustment;
FIG. 3 is a schematic view of a process for cleaning tab sealant at suspended parts by using laser based on power density adjustment;
FIG. 4 is a schematic diagram of a battery cell after the process of cleaning the tab sealant by using laser based on power density adjustment;
FIG. 5 is a schematic diagram of a battery cell after the removal of the tab sealant process for laser cleaning based on power density adjustment;
FIG. 6 is a schematic diagram of a module of a laser cleaning tab sealant device based on power density adjustment according to the present invention;
FIG. 7 is a low power optical microscope photograph of the process for cleaning the tab sealant based on power density adjustment after cutting the suspended tab sealant by a picosecond laser;
FIG. 8 is a high-power optical microscope photograph of the process for cleaning the tab sealant based on power density adjustment after cutting the suspended tab sealant by a picosecond laser;
FIG. 9 is an optical microscope photograph of a boundary of a tab sealant on a tab foil cleaned by a laser with a focused spot size of less than 0.5 mm;
FIG. 10 is a high-power optical microscope photograph of a laser cleaning tab sealant process based on power density adjustment, after a focused carbon dioxide laser with a spot size smaller than 0.5 mm is used for cleaning tab sealant on a nickel foil tab;
FIG. 11 is an optical microscope photograph of a laser cleaning tab sealant process based on power density adjustment, wherein the laser cleaning tab sealant process adopts a carbon dioxide laser with a focused light spot size of 0.8 mm to simultaneously clean tab sealant at a suspended part and tab sealant on tab foil;
FIG. 12 is an optical microscope photograph of a laser cleaning tab sealant process based on power density adjustment, after cleaning a suspended portion tab sealant with a focused carbon dioxide laser with a spot size of 0.8 mm;
FIG. 13 is an optical microscope photograph of a tab sealant on a suspended part and a tab sealant on a tab foil simultaneously cleaned by an infrared nanosecond laser with a pulse width of 500ns in a laser tab sealant cleaning process based on power density adjustment;
fig. 14 is a high-power optical microscope photograph of the process for cleaning the tab sealant based on power density adjustment by using an infrared nanosecond laser with a pulse width of 500ns to clean the tab sealant on the aluminum tab.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
The process for cleaning the tab sealant by using the laser based on power density adjustment is characterized in that the laser power density is set by collecting the characteristics of the tab sealant, and the characteristics are one or any combination of the melting point, thickness, color and position of the tab sealant; the higher the melting point, the greater the power density of the laser; the greater the thickness, the greater the power density of the laser; the higher the transmittance, the smaller the absorbance and the higher the power density; the lug sealant at the suspended part improves the photon intensity of laser and reduces the pulse width; and the lug sealant at the supporting part reduces the photon intensity of laser and improves the pulse width. Common tab sealant materials are polypropylene (PP), modified polypropylene, polyethylene naphthalate (PEN), polyphthalamide (PPA), or modified polyphthalamide (PPA).
And a carbon dioxide laser is adopted to provide laser with low photon intensity and large pulse width, and the lug sealant at the supporting part is cleared.
Further, the power of the carbon dioxide laser is 10W-300W.
Furthermore, a pulse laser is adopted to provide high photon intensity and small pulse width laser, and the lug sealing glue at the suspended part is removed. Common pulsed lasers are nanosecond pulsed lasers, picosecond pulsed lasers or femtosecond pulsed lasers.
Further, the pulse width of the pulse laser is 50fs-100ns.
Further, the wavelength of the pulse laser is 200nm-2 μm.
Further, the power density of the laser is set according to the tab sealant material of the supporting part, and the larger the thickness of the tab sealant material is, the higher the melting point is, and the higher the power density of the laser is.
Further, according to the laser power density set by the distance between the cleaning area of the supporting part and the sealing edge of the battery, the closer the cleaning area is to the sealing edge of the battery, the smaller the power density of the laser
Further, the power density is adjusted by adjusting the spot size of the carbon dioxide laser or the pulse laser, and the smaller the spot size is, the larger the power density is.
Further, the size of the spot size is 200nm-0.6mm.
Further, the photon intensity is adjusted by adjusting the operating wavelength of the carbon dioxide laser.
A laser washs utmost point ear sealed glue device based on power density adjusts for realizing above-mentioned laser washs utmost point ear sealed glue technology based on power density adjusts, includes: the system comprises a man-machine interaction interface, an industrial personal computer in bidirectional communication with the man-machine interaction interface, a visual positioning system connected with the industrial personal computer, a site control unit in bidirectional communication with the industrial personal computer, a laser generator connected with the site control unit, a vibration lens connected with the site control unit and the laser generator, a movable platform connected with the site control unit, and an auxiliary device connected with the movable platform, wherein the auxiliary device comprises a cartridge clip device, an air blowing device and a dust removal device. The vibration lens is a movable vibration lens and moves in three directions of an X axis, a Y axis and a Z axis, the movement speed is not lower than 200mm/s, the positioning speed is not lower than 500mm/s, and the positioning precision is better than 30 mu rad. The movable platform transversely moves or overturns in the X axis, the Y axis and the Z axis, and the positioning precision of the displacement movement is better than 0.5 millimeter. The cartridge clip device is used for fixing the tab foil in the laser cleaning process.
Embodiment one:
the process for cleaning the tab sealant by using the laser based on power density adjustment is characterized in that the laser power density is set by collecting the characteristics of the tab sealant, and the characteristics are one or any combination of the melting point, thickness, color and position of the tab sealant; the higher the melting point, the greater the power density of the laser; the greater the thickness, the greater the power density of the laser; the higher the transmittance, the smaller the absorbance and the higher the power density; the lug sealant at the suspended part improves the photon intensity of laser and reduces the pulse width; and the lug sealant at the supporting part reduces the photon intensity of laser and improves the pulse width. The tab sealant material in this embodiment is a three-layer structure of PP and modified PP, and has a thickness of about 100 μm, translucency, and a melting point of 167 ℃ for the skeleton layer PP, and 135 ℃ for the modified PP. The position of the tab sealant is shown in fig. 1.
As shown in fig. 2, a carbon dioxide laser is used to provide laser with low photon intensity and large pulse width, and the tab sealant at the supporting part is removed.
In this example, the power of the carbon dioxide laser was 30W and the operating frequency was 8 kHz.
In this embodiment, as shown in fig. 3, a pulse laser is used to provide a laser with high photon energy and small pulse width, so as to remove the tab sealant at the suspended portion. The pulse laser is a picosecond ultraviolet laser, and a picosecond green laser or a nanosecond ultraviolet laser can also be used.
In this embodiment, the pulse width of the pulse laser is 10ps.
In this embodiment, the wavelength of the pulsed laser is 355nm.
The state of the removed tab sealant is shown in fig. 4 or 5.
In this embodiment, the closer the cleaning region is to the battery sealing edge, the lower the laser power density is, according to the laser power density set by the distance between the cleaning region of the support portion and the battery sealing edge. The distance S between the cleaning region of the support portion and the sealing edge of the battery in this embodiment is shown in fig. 1 to 3.
In this embodiment, the power density is adjusted by adjusting the spot size of the carbon dioxide laser or the pulse laser, and the smaller the spot size, the larger the power density. The spot size is typically adjusted by focusing the lens.
In this embodiment, the spot size is 0.3mm.
In this embodiment, the photon energy is adjusted by adjusting the operating wavelength of the pulsed laser.
As shown in fig. 6, this embodiment adopts a laser cleaning tab sealant device based on power density adjustment for implementing the above laser cleaning tab sealant process based on power density adjustment, and includes: the system comprises a man-machine interaction interface, an industrial personal computer in bidirectional communication with the man-machine interaction interface, a visual positioning system connected with the industrial personal computer, a site control unit in bidirectional communication with the industrial personal computer, a laser generator connected with the site control unit, a vibration lens connected with the site control unit and the laser generator, a movable platform connected with the site control unit, and an auxiliary device connected with the movable platform, wherein the auxiliary device comprises a cartridge clip device, an air blowing device and a dust removal device.
The vibration lens is a movable vibration lens and moves in the X-axis, Y-axis and Z-axis directions, the movement speed is not lower than 200mm/s, the positioning speed is not lower than 500mm/s, and the positioning accuracy is better than 30urad.
The movable platform transversely moves or overturns in the X axis, the Y axis and the Z axis, and the positioning precision of the displacement movement is better than 0.5 millimeter.
The cartridge clip device is used for fixing the tab foil in the laser cleaning process.
The processing parameters that the automated system can achieve are as follows:
the cleaning efficiency is high, and the single-station efficiency is as follows: 15PPM;
the cleaning quality is good, and the tab sealant remains: <0.05mm;
the dimensional accuracy is accurate, and the slot position dimensional error is less than 0.10mm;
the cleaning efficiency is <1.20s/ea single-site efficiency >15PPM;
heat affected zone <100 μm;
tab wrinkling degree: no significant wrinkling.
In the embodiment, the suspended tab sealant is cleaned by using a picosecond laser, the pulse width of the laser is 10ps, the repetition frequency is 800kHz, and the low-power and high-power optical microscope pictures of the incision morphology are shown in fig. 7 and 8, so that the laser incision is very clean and neat, no obvious hot melt adhesive piling and scorching carbonization phenomenon exists, and the roughness at the cleaning boundary is less than 10 microns.
In this embodiment, the focusing lens is used to focus the light spot of the carbon dioxide laser to below 0.5 mm, the power of the carbon dioxide laser is 30W, and the carbon dioxide laser is used to clean the electrode tab sealant on the nickel electrode tab, so that the electrode tab sealant can be cleanly cleaned, and the stacking glue at the boundary between the cleaning and non-cleaning areas is close to 0.1 mm, as shown in fig. 9. The areas after cleaning have no obvious tab sealant residue nor obvious pinholes, and the appearance of the high-power optical microscope on the nickel foil after cleaning is shown in fig. 10.
Comparative example one:
the laser glue removing process applicable to the conventional PCB and the like is used, the spot size of the carbon dioxide laser after focusing is 0.8 millimeter, the working power is 30W, the laser glue removing process is used for cleaning the tab sealant on the nickel tab, obvious hot melting deformation of the tab sealant at the suspended part can be found, and the tab sealant on the tab foil cannot be completely cleaned, as shown in the photo of FIG. 11. The tab sealant at the suspended portion is obviously hot melt adhesive, as shown in the photograph of fig. 12.
Comparative example two:
the infrared nanosecond fiber laser for cleaning the tab is used for simultaneously processing the tab sealant at the suspended part and the tab sealant on the tab foil, the pulse width of the laser is 500ns, the working power is 20W, the repetition frequency is 40kHz, after cleaning by using an optimized process, the thermal effect is still found to be obvious, on one hand, the suspended part is difficult to obtain a neat notch, on the other hand, the metal foil is easy to be damaged when being processed on the metal foil, for example, the nickel foil can leak out of a copper core, the aluminum foil can melt and become fragile, and tiny fracture appears, so that the mechanical property and the weldability of the obtained tab are reduced. The root of the pole lug finds a serious hot melting phenomenon, and the notches of the pole lug sealant at the suspended part are uneven, as shown in fig. 13. In addition, there is a significant phenomenon of metal melting on the tab aluminum foil after processing using this process, as shown in fig. 14.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. The process for cleaning the tab sealant by using the laser based on the power density adjustment is characterized by collecting the characteristics of the tab sealant, namely the combination of the melting point, the thickness, the color and the position of the tab sealant, and setting the laser power density; the higher the melting point, the greater the power density of the laser; the greater the thickness, the greater the power density of the laser; the higher the transmittance, the smaller the absorbance and the higher the power density; the lug sealing glue at the suspended part improves the photon energy of laser and reduces the pulse width; the electrode lug sealant of the supporting part reduces the photon energy of laser and improves the pulse width; providing low photon energy large pulse width laser by adopting a carbon dioxide laser, and selectively removing the tab sealant at the supporting part; a pulse laser is adopted to provide high photon energy and small pulse width laser, and the lug sealant at the suspended part is removed; the power of the carbon dioxide laser is 10W-300W; the pulse width of the pulse laser is 50fs-100ns; the wavelength of the pulse laser is 200nm-2 mu m; adjusting the power density by adjusting the spot size of a carbon dioxide laser or a pulse laser, the smaller the spot size, the greater the power density; the size of the light spot is 200nm-0.6mm.
2. The laser cleaning tab sealant process based on power density adjustment according to claim 1, wherein the laser power density is set according to the distance between the cleaning area of the support part and the battery sealing edge, and the closer the cleaning area is to the battery sealing edge, the smaller the power density of the laser.
3. The laser cleaning tab sealant process based on power density adjustment of claim 1 wherein photon energy is adjusted by adjusting the operating wavelength of the pulsed laser.
4. A power density adjustment-based laser cleaning tab sealant device for implementing the power density adjustment-based laser cleaning tab sealant process of claim 1, comprising: the system comprises a man-machine interaction interface, an industrial personal computer in bidirectional communication with the man-machine interaction interface, a visual positioning system connected with the industrial personal computer, a site control unit in bidirectional communication with the industrial personal computer, a laser generator connected with the site control unit, a vibrating lens connected with the site control unit and the laser generator, a movable platform connected with the site control unit and an auxiliary device connected with the movable platform, wherein the auxiliary device comprises a cartridge clip device, an air blowing device and a dust removal device.
5. The laser cleaning tab sealant device based on power density adjustment according to claim 4, wherein the vibration lens is a movable vibration lens and moves in three directions of an X axis, a Y axis and a Z axis, the movement speed is not lower than 200mm/s, the positioning speed is not lower than 500mm/s, and the positioning accuracy is better than 30 mu rad.
6. The laser cleaning tab sealant device based on power density adjustment according to claim 4, wherein the movable platform moves or overturns transversely in three directions of an X axis, a Y axis and a Z axis, and the positioning precision of displacement movement is better than 0.5 mm.
7. The laser cleaning tab sealant device based on power density adjustment of claim 4, wherein the clip device is used to secure tab foil during laser cleaning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210934813.2A CN115464268B (en) | 2022-08-04 | 2022-08-04 | Laser cleaning tab sealant process and device based on power density adjustment |
Applications Claiming Priority (1)
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| CN217060622U (en) * | 2022-02-22 | 2022-07-26 | 武汉光涵科技有限公司 | Optical head of remote laser foreign matter removing system |
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| WO1992007367A1 (en) * | 1990-10-11 | 1992-04-30 | Aerospatiale Societe Nationale Industrielle | Method and machine for marking an electric cable |
| US5319183A (en) * | 1992-02-18 | 1994-06-07 | Fujitsu Limited | Method and apparatus for cutting patterns of printed wiring boards and method and apparatus for cleaning printed wiring boards |
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Denomination of invention: A laser cleaning process and device for pole ear sealant based on power density adjustment Granted publication date: 20230818 Pledgee: Nanjing Branch of Jiangsu Bank Co.,Ltd. Pledgor: Nanjing Kenai Laser Technology Co.,Ltd. Registration number: Y2024980005335 |