CN112894138B - Welding method and system for pole lugs of soft-package battery - Google Patents

Welding method and system for pole lugs of soft-package battery Download PDF

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Publication number
CN112894138B
CN112894138B CN202110240958.8A CN202110240958A CN112894138B CN 112894138 B CN112894138 B CN 112894138B CN 202110240958 A CN202110240958 A CN 202110240958A CN 112894138 B CN112894138 B CN 112894138B
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welding
laser
real
weld
vibrating mirror
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CN112894138A (en
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吴轩
冉昌林
熊五岳
雷波
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Wuhan Yifi Laser Corp Ltd
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Wuhan Yifi Laser Corp Ltd
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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
    • 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
    • B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
    • B23K26/044—Seam tracking
    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention provides a method and a system for welding a soft package battery tab, wherein laser emitted by a vibrating mirror welding head is adopted to weld the soft package battery tab and a material belt, a real-time monitoring system for the whole process of LDD laser welding is adopted to collect a first image of a pre-welding area, and the first image is processed and analyzed to obtain related data; finally, the relevant data are processed and analyzed in real time so as to guide the real-time online adjustment of the laser welding process parameters, thereby reducing the influence of material warpage on welding quality and realizing real-time weld tracking; solves the problem of welding deviation caused by incorrect identification due to the fact that the liquid injection hole is not assembled in place during welding. Moreover, by adopting the continuous laser with preset power, the welding efficiency can be improved, so that the welding quality and the welding efficiency are ensured at the same time.

Description

Welding method and system for pole lugs of soft-package battery
Technical Field
The invention relates to the technical field of laser welding, in particular to a method and a system for welding lugs of a soft package battery.
Background
In the prior art, the welding of the tab of the soft-package battery is generally resistance welding, and the welding mode is mainly manual welding. Because of the operation mode of manual welding, the welding effect cannot be ensured, the welding of the tabs is often unstable, the phenomena of cold joint, false welding and the like are easy to occur, the internal resistance of the soft-packaged battery is higher, and the reject ratio of the finished product is increased.
Therefore, there is an urgent need to provide a welding method for tab of soft-pack battery, so as to solve the technical problems in the prior art.
Disclosure of Invention
The invention provides a welding method and a welding system for pole lugs of a soft-package battery, which are used for solving the defects in the prior art.
The invention provides a welding method for pole lugs of a soft-package battery, which comprises the following steps:
welding the soft package battery tab and the material belt by adopting laser emitted by a vibrating mirror welding head, wherein the vibrating mirror welding head is connected with a continuous laser with preset power;
acquiring a first image of a pre-welding region based on an LDD laser welding whole process real-time monitoring system, and processing and analyzing the first image to obtain related data;
carrying out real-time processing and analysis on the related data so as to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of the material, a surface finish, and a weld location.
According to the welding method for the soft package battery tab, provided by the invention, the soft package battery tab and the material belt are welded by adopting the laser emitted by the vibrating mirror welding head, and the welding method specifically comprises the following steps:
determining the laser welding process parameters, wherein the laser welding process parameters comprise a target vertical distance between a welding area formed by the soft package battery lug and the material belt and a light outlet of the vibrating mirror welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the vibrating mirror welding head and a welding track;
and welding the tab of the soft package battery and the material belt by adopting the laser based on the laser welding process parameters.
The welding method for the soft package battery tab provided by the invention further comprises the following steps:
acquiring weld width data and real-time penetration data of a keyhole in a welding process based on the real-time monitoring system of the whole LDD laser welding process;
and carrying out real-time processing and analysis on the real-time penetration data and the weld width data so as to guide real-time online adjustment of laser welding process parameters.
According to the soft package battery tab welding method provided by the invention, when the soft package battery tab and the material belt are welded by adopting the laser emitted by the vibrating mirror welding head, the temperature of the vibrating mirror welding head is constant.
The welding method for the soft package battery tab provided by the invention further comprises the following steps:
acquiring a second image of the welded region based on the real-time monitoring system of the whole LDD laser welding process, and processing and analyzing the second image to obtain a second type of welding defect;
wherein the second type includes one or more of a missing solder, a blast, a pit, and a surface pinhole.
The welding method for the soft package battery tab provided by the invention further comprises the following steps:
acquiring the height and roughness of the surface after welding;
and processing and analyzing the post-welding surface height and the post-welding surface roughness to guide real-time online adjustment of laser welding process parameters.
According to the soft package battery tab welding method provided by the invention, the laser welding process parameters also comprise the swing size and the swing frequency of the vibrating mirror welding head.
According to the welding method for the soft package battery tab, when the soft package battery tab and the material belt are welded by adopting the laser emitted by the vibrating mirror welding head, protective gas is injected into the environment where the welding area formed by the soft package battery tab and the material belt is located.
According to the soft package battery tab welding method provided by the invention, the continuous laser with preset power is specifically a 1000W-2000W fundamental mode laser.
The invention also provides a soft package battery tab welding system, which comprises: the real-time monitoring system comprises a vibrating mirror welding head, a continuous laser with preset power and an LDD laser welding whole process, wherein the vibrating mirror welding head is connected with the continuous laser with preset power;
the laser emitted by the vibrating mirror welding head is used for welding the pole lugs of the soft package battery and the material belt;
the LDD laser welding whole process real-time monitoring system is used for collecting a first image of a pre-welding area, and processing and analyzing the first image to obtain related data;
the LDD laser welding whole process real-time monitoring system is also used for carrying out real-time processing and analysis on the related data so as to guide the real-time online adjustment of the laser welding process parameters;
wherein the relevant data includes one or more of a height of the material, a surface finish, and a weld location.
The invention provides a soft package battery tab welding method and a soft package battery tab welding system, wherein laser emitted by a vibrating mirror welding head is adopted to weld a soft package battery tab and a material belt, a real-time monitoring system is adopted in the whole process of LDD laser welding, a first image of a pre-welding area is acquired, and the first image is processed and analyzed to obtain related data; finally, the relevant data are processed and analyzed in real time so as to guide the real-time online adjustment of the laser welding process parameters, thereby reducing the influence of material warpage on welding quality and realizing real-time weld tracking; solves the problem of welding deviation caused by incorrect identification due to the fact that the liquid injection hole is not assembled in place during welding. Moreover, by adopting the continuous laser with preset power, the welding efficiency can be improved, so that the welding quality and the welding efficiency are ensured at the same time.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a welding method for a tab of a soft package battery provided by the invention;
FIG. 2 is a schematic diagram of the motion trail of the vibrating mirror welding head provided by the invention;
fig. 3 is a schematic structural diagram of a welding system for tabs of a soft-pack battery provided by the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the prior art, the welding of the tab of the soft-package battery is generally resistance welding, and the welding mode is mainly manual welding. Because of the operation mode of manual welding, the welding effect cannot be ensured, the welding of the tabs is often unstable, the phenomena of cold joint, false welding and the like are easy to occur, the internal resistance of the soft-packaged battery is higher, and the reject ratio of the finished product is increased. The pulse laser is adopted for welding, although the cost is low, the welding efficiency is low, the consistency of welding quality is difficult to ensure, and the welding seam position is easy to embrittle. The Mopa laser is used for welding, and although the appearance is good and the consistency is easy to ensure, the problem of low welding efficiency exists. The swing welding head is matched with the laser to weld, so that the problem of low welding efficiency is also solved, and the welded product has higher requirements and is unfavorable for smooth welding. Therefore, the embodiment of the invention provides a welding method for the tab of the soft-package battery, which is used for solving the technical problems in the prior art.
Fig. 1 is a schematic flow chart of a welding method for a tab of a soft package battery according to an embodiment of the present invention, as shown in fig. 1, the method includes:
s1, welding a soft package battery tab and a material belt by adopting laser emitted by a vibrating mirror welding head, wherein the vibrating mirror welding head is connected with a continuous laser with preset power;
s2, based on an LDD laser welding whole process real-time monitoring system, acquiring a first image of a pre-welding region, and processing and analyzing the first image to obtain related data;
s3, carrying out real-time processing and analysis on the related data so as to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of the material, a surface finish, and weld coordinates.
Specifically, the welding method for the soft package battery tab provided by the embodiment of the invention can be realized through a soft package battery tab welding system. The soft package battery can be a soft package lithium ion battery or other soft package batteries, the soft package battery comprises an anode and a cathode, and the tab of the soft package battery refers to a metal conductor for leading out the anode and the cathode from the battery core of the soft package battery. The welding of the soft package battery tab refers to welding the soft package battery tab with a material belt, namely welding the soft package battery tab on the material belt, so as to realize the series connection of a plurality of soft package batteries. The material strip may perform the functions of conducting electricity and collecting current, and may be a current collecting disc or other elements, which are not particularly limited in the embodiment of the present invention.
Firstly, step S1 is executed, and laser emitted by a vibrating mirror welding head is adopted to weld the tab of the soft package battery and the material belt. The vibrating mirror welding head is connected with a continuous laser with preset power, so that laser emitted by the continuous laser with preset power can be emitted through the vibrating mirror welding head and hit on the soft package battery tab and the material belt to realize welding. The galvanometer welding head can be fixed on a bracket of the galvanometer platform and can deflect the direction of the emitted laser. The vibrating mirror platform can further comprise a translation assembly, the translation assembly can comprise a first motion platform and a movable plate, the first motion platform can drive the movable plate to move along a fixed direction relative to the vibrating mirror welding head, the movable plate extends along the fixed direction, a plurality of installation positions for fixing a material belt are arranged on the movable plate, and the installation positions are distributed at intervals along the fixed direction. During welding, the vibrating mirror welding head can be fixed, welding is realized through a mode that the vibrating mirror welding head deflects laser, high-speed welding can be realized, and therefore welding efficiency can be improved. And through setting up translation subassembly, realize pipelined continuous operation, can further improve welding efficiency. In the embodiment of the invention, the motion track of the galvanometer welding head can be actively adjusted, for example, the motion track of the galvanometer welding head can be shown in fig. 2.
And step S2, acquiring a first image of a pre-welding area through an LDD laser welding whole process real-time monitoring system, and processing and analyzing the first image to obtain relevant data such as the height, the surface finish, the welding seam position and the like of the material. The real-time monitoring system for the whole LDD laser welding process comprises a camera and a light source. The real-time monitoring system for the whole LDD laser welding process can detect in real time in a coaxial/paraxial mode with the vibrating mirror welding head.
And finally, executing step S3, and carrying out real-time processing and analysis on the related data, wherein the acquired material height and the preset material height can be compared, the acquired material surface finish and the preset material surface finish can be compared, and the acquired welding seam position and the preset welding seam position can be compared, so that the real-time online adjustment of the laser welding process parameters can be guided. The laser welding process parameters may include a target vertical distance between a welding area formed by the flexible battery tab and the material strip and a light outlet of the galvanometer welding head, defocus amount of laser emitted by the galvanometer welding head, power of a continuous laser, welding speed of the galvanometer welding head and welding track, and the target vertical distance may refer to a working distance of the galvanometer welding head, where the unit is mm. The defocus unit is mm, the power unit is W, the welding speed unit is mm/s, the welding track can be a movement track of laser emitted by a vibrating mirror welding head, and the movement track can be set according to requirements, such as a linear track, a spiral track, a sine track or a cosine track, and the like, and the embodiment of the invention is not particularly limited.
The weld joint position can be checked at the position 1-5mm in front of the weld joint, and the corresponding defect types can comprise clamping abnormality, mismatch, movement error, clearance abnormality and the like. In the embodiment of the invention, the defect type can be judged by taking the center line of the welding seam, the left edge of the welding seam and the right edge of the welding seam as evaluation standards. The standard requirement of the target vertical distance can be in linear proportion to the diameter of a field lens in a vibrating lens platform where a vibrating lens welding head is located, and the defect types corresponding to the target vertical distance can comprise defocusing, abnormal clamping, movement errors, warping, overlapping weld joint dislocation and the like. In the embodiment of the invention, the defect type can be judged by taking the height of the material as an evaluation standard.
According to the soft package battery tab welding method provided by the embodiment of the invention, the soft package battery tab and the material belt are welded by adopting laser emitted by the vibrating mirror welding head, and a first image of a pre-welding area is acquired through an LDD laser welding whole process real-time monitoring system, and the first image is processed and analyzed to obtain related data; finally, the relevant data are processed and analyzed in real time so as to guide the real-time online adjustment of the laser welding process parameters, thereby reducing the influence of material warpage on welding quality and realizing real-time weld tracking; solves the problem of welding deviation caused by incorrect identification due to the fact that the liquid injection hole is not assembled in place during welding. Moreover, by adopting the continuous laser with preset power, the welding efficiency can be improved, so that the welding quality and the welding efficiency are ensured at the same time.
Based on the foregoing embodiments, the welding method for the tab of the soft package battery provided in the embodiments of the present invention, wherein the welding of the tab of the soft package battery and the material belt by using the laser emitted from the galvanometer welding head specifically includes:
determining the laser welding process parameters, wherein the laser welding process parameters comprise a target vertical distance between a welding area formed by the soft package battery lug and the material belt and a light outlet of the vibrating mirror welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the vibrating mirror welding head and a welding track;
and welding the tab of the soft package battery and the material belt by adopting the laser based on the laser welding process parameters.
Specifically, in the welding method for the tab of the soft package battery provided by the embodiment of the invention, when welding is performed, firstly, the laser welding process parameters, namely, the target vertical distance between the welding area formed by the tab of the soft package battery and the material belt and the light outlet of the vibrating mirror welding head, the defocusing amount of laser, the power of a continuous laser, the welding speed of the vibrating mirror welding head and the welding track are determined, and the value range of the target vertical distance can be determined according to the diameter of a field lens, for example, 150mm can be set; the value range of the defocusing amount can be set to be-10 mm-10mm; the value range of the power of the continuous laser can be set to 1000W-3000W; the welding speed of the vibrating mirror welding head can be set to be 0-500mm/s; the welding track can be one of a straight track, a spiral track, a sine track or a cosine track. The measurement of the vertical distance of the target may be implemented by a ranging sensor, which is not specifically limited in the embodiment of the present invention.
And then welding the tab of the soft package battery and the material belt by adopting laser emitted by the vibrating mirror welding head according to the determined laser welding process parameters, so that the welding quality can be ensured.
On the basis of the above embodiment, the welding method for the tab of the soft package battery provided in the embodiment of the present invention further includes:
acquiring weld width data and real-time penetration data of a keyhole in a welding process based on the real-time monitoring system of the whole LDD laser welding process;
and carrying out real-time processing and analysis on the real-time penetration data and the weld width data so as to guide real-time online adjustment of laser welding process parameters.
Specifically, the real-time monitoring system for the whole process of LDD laser welding can acquire the weld width data and the real-time penetration data of the keyhole in the welding process, then can process and analyze the weld width data and the real-time penetration data in real time, judges whether the weld width data is in a first preset range and the real-time penetration data is in a second preset range, and adjusts the laser welding process parameters in real time on line according to the judging result. The first preset range and the second preset range may be set according to needs, which is not particularly limited in the embodiment of the present invention.
The defect types corresponding to the real-time penetration data may include insufficient penetration, excessive penetration, that is, the real-time penetration data is outside the second preset range and smaller than the minimum value of the second preset range, and unstable process, that is, the real-time penetration data fluctuates greatly.
In the embodiment of the invention, the decisive parameter data of the laser welding quality such as the real-time penetration data, the welding line width data and the like can be detected and obtained by the LDD laser welding whole process real-time monitoring system so as to adjust the laser welding process parameters in real time. When welding is carried out, the real-time penetration data can be within a second preset range by properly adjusting the laser welding process parameters so as to ensure the laser welding quality.
On the basis of the above embodiment, according to the welding method for the tab of the soft package battery provided by the embodiment of the invention, the real-time penetration data is obtained specifically by the following method:
transmitting detection laser into the liquid molten pool, receiving the reflected signal, and acquiring the real-time penetration data by utilizing an optical coherence principle.
Specifically, in the embodiment of the invention, the light source in the LDD laser welding whole process real-time monitoring system can emit detection laser into the liquid molten pool generated in the welding process, and then receive a reflection signal obtained by reflecting the detection laser at the bottom of the liquid molten pool. Real-time penetration data can be obtained by utilizing the optical coherence principle, and can be calculated directly according to the time difference between the received reflected signal and the emitted detection laser and the propagation speed of the optical signal in the liquid molten pool.
The embodiment of the invention provides a method for acquiring real-time penetration data, which can ensure the accurate acquisition of the real-time penetration data, thereby reducing the evaluation error of the laser welding quality.
On the basis of the above embodiment, the welding method for the tab of the soft package battery provided in the embodiment of the present invention further includes:
and if the real-time penetration data is judged to be beyond the set value range, the LDD laser welding whole-process real-time monitoring system sends out a welding seam abnormal alarm.
Specifically, in the embodiment of the invention, after the real-time penetration data is determined, whether the real-time penetration data is within the set value range or not can be judged, if the real-time penetration data exceeds the set value range, the description can be possibly penetrated by welding, and at the moment, the real-time monitoring system of the whole LDD laser welding process sends out abnormal welding seam alarms so as to prompt a user to timely check the actual welding situation, thereby reducing the adverse effects caused by abnormal welding and ensuring the instantaneity of abnormal processing.
Based on the above embodiments, in the method for welding the tab of the soft package battery provided in the embodiments of the present invention, when the laser emitted by the vibrating mirror welding head is used to weld the tab of the soft package battery with the material belt, the temperature of the vibrating mirror welding head is constant.
Specifically, in the embodiment of the invention, in order to ensure the welding quality, the temperature of the vibrating mirror welding head is required to be constant when welding is performed, so that the vibrating mirror welding head is not damaged by the changed temperature, the light emitting stability can be ensured, and the welding quality is further ensured. In order to ensure the constant temperature of the vibrating mirror welding head, a temperature detection device and a temperature adjusting device can be configured, the temperature of the vibrating mirror welding head can be detected in real time through the temperature detection device, whether the temperature in the welding process changes or not is judged, and if the temperature changes, the temperature of the vibrating mirror welding head is adjusted through the temperature adjusting device. For example, if the temperature is increased compared to the last time, the temperature may be decreased by the temperature adjusting means, and if the temperature is decreased compared to the last time, the temperature may be increased by the temperature adjusting means. The temperature detection device can be internally provided with a Yu Zhenjing welding head or arranged outside the vibrating mirror welding head, and a probe of the temperature detection device extends to the inside of the vibrating mirror welding head.
On the basis of the above embodiment, the welding method for the tab of the soft package battery provided in the embodiment of the present invention further includes:
acquiring a second image of the welded region based on the real-time monitoring system of the whole LDD laser welding process, and processing and analyzing the second image to obtain a second type of welding defect;
wherein the second type includes one or more of a missing solder, a blast, a pit, and a surface pinhole.
Specifically, in the embodiment of the invention, the camera in the real-time monitoring system of the whole LDD laser welding process can acquire the second image of the post-welding region, and then the second image can be processed and analyzed to further obtain the second type of welding defect.
Based on computer vision, the weld center after the molten pool is formed can be determined from the second image, and the identification of NG conditions such as missing welding, explosion points, pinholes and the like after laser welding is researched based on the weld center, so that the problems of detection of the number of welding points, explosion points and missing welding defects in welding of the tab of the soft package battery are solved; the problems of weld seam explosion point, welding leakage and pinhole defect detection of seal welding and liquid injection hole welding are solved.
The method is characterized in that the line spot image on the welding line is acquired, and the real appearance outline of the welding line is obtained by combining the camera calibration result. And reconstructing a three-dimensional model of the welding seam through a three-dimensional reconstruction algorithm according to the second type of the welding defect and the real appearance outline of the welding seam, so as to obtain a three-dimensional model image of a welding quality detection result.
The second type of weld defect may include excess height, underfilling, pits, surface voids, etc., which may be determined by the height of the weld center and the post-weld penetration.
According to the soft package battery tab welding method provided by the embodiment of the invention, the second image of the welded area is acquired through the LDD laser welding whole process real-time monitoring system, and the second image is processed and analyzed to obtain the second type of welding defects, so that the welding quality can be further determined, and the real-time online adjustment of the laser welding process parameters is guided.
Based on the above embodiment, the welding method for the tab of the soft package battery provided in the embodiment of the present invention further includes:
acquiring the height and roughness of the surface after welding;
and processing and analyzing the post-welding surface height and the post-welding surface roughness to guide real-time online adjustment of laser welding process parameters.
Specifically, in the embodiment of the invention, after the welding operation is finished, the post-welding surface height and the post-welding surface roughness can be obtained, processed and analyzed, the post-welding surface height can be compared with a set height range, the post-welding surface roughness is compared with a preset surface roughness range, and the real-time online adjustment of the laser welding process parameters is guided according to the comparison result, so that the post-welding surface height after the adjustment of the laser welding process parameters is within the set height range, the post-welding surface roughness is within the preset surface roughness range, and the welding quality is ensured.
The welded weld cross section may also be obtained by a cross-weld operation. The defect types corresponding to the cross section of the welding line can comprise too wide welding line, too narrow welding line, center deviation of the welding line and the like, and can be judged by taking the center position of the welding line, the left edge of the welding line, the right edge of the welding line and the width of the welding line as evaluation standards.
According to the welding method for the soft package battery tab, provided by the embodiment of the invention, the welding quality can be further determined by acquiring the post-welding surface height and the post-welding surface roughness so as to guide the real-time online adjustment of the laser welding process parameters.
On the basis of the above embodiment, according to the welding method for the tab of the soft package battery provided by the embodiment of the invention, the laser welding process parameters include the swing size and the swing frequency of the vibrating mirror welding head, and the optimal welding effect can be achieved by adjusting the swing size and the swing frequency.
Based on the above embodiments, according to the welding method for the tab of the soft package battery provided by the embodiment of the invention, the material of the tab of the soft package battery is copper or aluminum, and the material of the material belt is copper.
Specifically, the material of the positive electrode tab in the soft package battery tab is aluminum, the material of the negative electrode tab is copper, and the material of the material belt is copper with good conductivity. According to experimental results, 0.4mm aluminum electrode lugs, and a welding reserved gap of 0mm, the tensile force bearable by the welded soft package battery electrode lugs and the material belt is 1150-1300N, and the effective penetration is 0.8-2mm;0.4mm aluminum tab, and a welding reserved gap of 0.15mm, the tensile force bearable by the welded soft package battery tab and the material belt is 1050-1200N, and the effective penetration depth is 0.7-2mm; copper lugs with the thickness of 0.3mm and a welding reserved gap of 0mm, wherein the tensile force bearable by the soft package battery lugs and the material belt after welding is 1450-1600N, and the effective penetration is 0.8-1.5mm; and the copper tab with the thickness of 0.3mm and the welding reserved gap of 0.15mm are adopted, so that the tensile force which can be born by the soft package battery tab and the material belt after welding is 1300-1500N, and the effective penetration depth is 0.7-1.2mm. The conditions can be tested through tensile force, and the penetration can be ensured without welding through the material belt.
On the basis of the above embodiment, according to the method for welding the tab of the soft package battery provided by the embodiment of the invention, when the tab of the soft package battery is welded with the material belt by using the laser emitted by the vibrating mirror welding head, the protective gas is injected into the environment where the welding area formed by the tab of the soft package battery and the material belt is located.
Specifically, when welding is performed, shielding gas can be injected into the environment where the welding area is located, so that the material of the welding area is prevented from being oxidized in the welding process, and meanwhile, the brightness of the obtained welding seam can be improved. The shielding gas may be nitrogen, helium, etc., and is not particularly limited in the embodiment of the present invention.
Based on the above embodiments, the soft package battery tab welding method provided in the embodiment of the present invention, where the continuous laser with preset power is specifically a 1000W-2000W fundamental mode laser.
Specifically, in the embodiment of the invention, the continuous laser can be a fundamental mode laser, and the preset power can be 1000W-2000W, and can be preferably 1500W.
In the embodiment of the invention, a high-power continuous laser is adopted, so that the welding efficiency of welding the lugs of the soft-package battery can be ensured. And the high-quality welding can be realized by matching with the vibrating mirror welding head and the LDD laser welding whole process real-time monitoring system.
As shown in fig. 3, on the basis of the above embodiment, in an embodiment of the present invention, there is provided a welding system for a tab of a soft pack battery, including: the vibration mirror welding head 31, the continuous laser 32 with preset power and the LDD laser welding whole process real-time monitoring system 33 are connected with the vibration mirror welding head 31;
the laser emitted by the vibrating mirror welding head 31 is used for welding the lugs of the soft package battery and the material belt;
the LDD laser welding whole process real-time monitoring system 33 is configured to collect a first image of a pre-welding region, and process and analyze the first image to obtain related data;
the LDD laser welding whole process real-time monitoring system 33 is further configured to process and analyze the related data in real time, so as to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of the material, a surface finish, and a weld location.
Specifically, the functions and the working flows of each element in the soft package battery tab welding system provided in the embodiment of the present invention are consistent with those of the above method embodiments, and the achieved effects are also consistent.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. The welding method for the tab of the soft-package battery is characterized by comprising the following steps of:
welding the soft package battery tab and the material belt by adopting laser emitted by a vibrating mirror welding head, wherein the vibrating mirror welding head is connected with a continuous laser with preset power; the vibrating mirror welding head is fixed on a bracket of the vibrating mirror platform and can deflect the direction of the emitted laser; the vibrating mirror platform further comprises a translation assembly, the translation assembly comprises a first motion platform and a movable plate, the first motion platform can drive the movable plate to move along a fixed direction relative to the vibrating mirror welding head, the movable plate extends along the fixed direction, a plurality of mounting positions for fixing the material belt are arranged on the movable plate, and the plurality of mounting positions are distributed at intervals along the fixed direction; the material of the soft package battery tab is copper or aluminum, and the material of the material belt is copper;
acquiring a first image of a pre-welding region based on an LDD laser welding whole process real-time monitoring system, and processing and analyzing the first image to obtain related data;
carrying out real-time processing and analysis on the related data so as to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes height of the material, surface finish, and weld location;
further comprises:
acquiring weld width data and real-time penetration data of a keyhole in a welding process based on the real-time monitoring system of the whole LDD laser welding process;
real-time processing and analyzing the real-time penetration data and the weld width data to guide real-time online adjustment of laser welding process parameters;
further comprises:
acquiring the height and roughness of the surface after welding;
processing and analyzing the post-welding surface height and the post-welding surface roughness to guide real-time online adjustment of laser welding process parameters;
further comprises:
acquiring a welded weld cross section, and judging defect types corresponding to the weld cross section by taking the center position of the weld, the left edge of the weld, the right edge of the weld and the width of the weld as evaluation criteria, wherein the defect types comprise over-wide weld, over-narrow weld, center deviation of the weld, abnormal clamping, mismatching and motion errors;
further comprises:
acquiring a second image of the welded region based on the real-time monitoring system of the whole LDD laser welding process, and processing and analyzing the second image to obtain a second type of welding defect;
wherein the second type comprises one or more of missing solder, explosion points, pits and surface pinholes;
further comprises:
acquiring a linear spot image on the welding line, and obtaining the real appearance outline of the welding line by combining the camera calibration result;
and reconstructing a three-dimensional model of the welding line through a three-dimensional reconstruction algorithm according to the second type and the real morphology profile, so as to obtain a three-dimensional model image of a welding quality detection result.
2. The welding method for the tab of the soft package battery according to claim 1, wherein the welding of the tab of the soft package battery and the material belt by using the laser emitted from the vibrating mirror welding head specifically comprises:
determining the laser welding process parameters, wherein the laser welding process parameters comprise a target vertical distance between a welding area formed by the soft package battery lug and the material belt and a light outlet of the vibrating mirror welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the vibrating mirror welding head and a welding track;
and welding the tab of the soft package battery and the material belt by adopting the laser based on the laser welding process parameters.
3. The welding method of the tab of the soft package battery according to claim 1, wherein when the tab of the soft package battery is welded with the material belt by using the laser emitted by the vibrating mirror welding head, the temperature of the vibrating mirror welding head is constant.
4. The method of any one of claims 1-3, wherein the laser welding process parameters further include a swing size and a swing frequency of the vibrating mirror weld head.
5. The welding method for the tab of the soft battery according to any one of claims 1 to 3, wherein when the tab of the soft battery is welded to the material strip by using the laser emitted from the vibrating mirror welding head, a protective gas is injected into an environment where a welding area formed by the tab of the soft battery and the material strip is located.
6. A method of welding tabs of a flexible package battery according to any of claims 1 to 3, characterized in that the continuous laser of preset power is in particular a 1000W-2000W fundamental mode laser.
7. A soft pack battery tab welding system, comprising: the real-time monitoring system comprises a vibrating mirror welding head, a continuous laser with preset power and an LDD laser welding whole process, wherein the vibrating mirror welding head is connected with the continuous laser with preset power;
the laser emitted by the vibrating mirror welding head is used for welding the pole lugs of the soft package battery and the material belt; the vibrating mirror welding head is fixed on a bracket of the vibrating mirror platform and can deflect the direction of the emitted laser; the vibrating mirror platform further comprises a translation assembly, the translation assembly comprises a first motion platform and a movable plate, the first motion platform can drive the movable plate to move along a fixed direction relative to the vibrating mirror welding head, the movable plate extends along the fixed direction, a plurality of mounting positions for fixing the material belt are arranged on the movable plate, and the plurality of mounting positions are distributed at intervals along the fixed direction; the material of the soft package battery tab is copper or aluminum, and the material of the material belt is copper;
the LDD laser welding whole process real-time monitoring system is used for collecting a first image of a pre-welding area, and processing and analyzing the first image to obtain related data;
the LDD laser welding whole process real-time monitoring system is also used for carrying out real-time processing and analysis on the related data so as to guide the real-time online adjustment of the laser welding process parameters;
wherein the relevant data includes height of the material, surface finish, and weld location;
the real-time monitoring system for the whole LDD laser welding process is also used for:
acquiring weld width data and real-time penetration data of a keyhole in a welding process;
real-time processing and analyzing the real-time penetration data and the weld width data to guide real-time online adjustment of laser welding process parameters;
also used for:
acquiring the height and roughness of the surface after welding;
processing and analyzing the post-welding surface height and the post-welding surface roughness to guide real-time online adjustment of laser welding process parameters;
also used for:
acquiring a welded weld cross section, and judging defect types corresponding to the weld cross section by taking the center position of the weld, the left edge of the weld, the right edge of the weld and the width of the weld as evaluation criteria, wherein the defect types comprise over-wide weld, over-narrow weld, center deviation of the weld, abnormal clamping, mismatching and motion errors;
also used for:
acquiring a second image of the welded region based on the real-time monitoring system of the whole LDD laser welding process, and processing and analyzing the second image to obtain a second type of welding defect;
wherein the second type comprises one or more of missing solder, explosion points, pits and surface pinholes;
also used for:
acquiring a linear spot image on the welding line, and obtaining the real appearance outline of the welding line by combining the camera calibration result;
and reconstructing a three-dimensional model of the welding line through a three-dimensional reconstruction algorithm according to the second type and the real morphology profile, so as to obtain a three-dimensional model image of a welding quality detection result.
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