CN112894138A - Soft package battery tab welding method and system - Google Patents
Soft package battery tab welding method and system Download PDFInfo
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- CN112894138A CN112894138A CN202110240958.8A CN202110240958A CN112894138A CN 112894138 A CN112894138 A CN 112894138A CN 202110240958 A CN202110240958 A CN 202110240958A CN 112894138 A CN112894138 A CN 112894138A
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- 238000000034 method Methods 0.000 title claims abstract description 134
- 239000000463 material Substances 0.000 claims abstract description 59
- 238000012544 monitoring process Methods 0.000 claims abstract description 32
- 238000012545 processing Methods 0.000 claims description 22
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- 230000007547 defect Effects 0.000 claims description 16
- 229920000642 polymer Polymers 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000005493 welding type Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000004927 fusion Effects 0.000 description 13
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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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
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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
- B23K26/04—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
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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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- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
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- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a method and a system for welding a soft package battery tab, wherein the method adopts laser emitted by a vibrating mirror welding head to weld the soft package battery tab and a material belt, collects a first image of a pre-welding area through an LDD laser welding overall process real-time monitoring system, and processes and analyzes the first image to obtain related data; finally, the related data are processed and analyzed in real time to guide the real-time on-line adjustment of the laser welding process parameters, so that the influence of material warping on the welding quality can be reduced, and the real-time welding seam tracking is realized; the problem of welding partially because of the assembly error identification that leads to not in place when solving notes liquid hole welding. Moreover, the continuous laser with the preset power is adopted, so that the welding efficiency can be improved, and the welding quality and the welding efficiency are ensured at the same time.
Description
Technical Field
The invention relates to the technical field of laser welding, in particular to a method and a system for welding a tab of a soft package battery.
Background
In the prior art, resistance welding is generally adopted for welding a soft package battery tab, and the welding mode is mainly manual welding. Due to the manual welding operation mode, the welding effect cannot be guaranteed, the tab is often welded not firmly, and the phenomena of insufficient welding, false welding and the like are easy to occur, so that the internal resistance of the soft package battery is higher, and the reject ratio of a finished product is increased.
Therefore, it is urgently needed to provide a method for welding a tab of a soft package battery, so as to solve the technical problems in the prior art.
Disclosure of Invention
The invention provides a method and a system for welding a tab of a soft package battery, which are used for overcoming the defects in the prior art.
The invention provides a method for welding a tab of a soft package battery, which comprises the following steps:
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;
collecting a first image of a pre-welding area based on an LDD laser welding overall process real-time monitoring system, and processing and analyzing the first image to obtain related data;
processing and analyzing the related data in real time to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of material, a surface finish, and a weld location.
According to the method for welding the soft package battery tab, the soft package battery tab and the material belt are welded by the laser emitted by the vibrating mirror welding head, and the 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 tab and the material belt and a light outlet of the galvanometer welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the galvanometer welding head and a welding track;
and based on the laser welding process parameters, adopting the laser to weld the soft package battery tab and the material belt.
The invention provides a soft-package battery tab welding method, which further comprises the following steps:
based on the LDD laser welding overall process real-time monitoring system, acquiring weld width data and keyhole real-time penetration data in the welding process;
and processing and analyzing the real-time penetration data and the weld width data in real time so as to guide real-time online adjustment of the laser welding process parameters.
According to the welding method for the soft package battery tab, provided by the invention, when the soft package battery tab and the material belt are welded by the laser emitted by the vibrating mirror welding head, the temperature of the vibrating mirror welding head is constant.
The invention provides a soft-package battery tab welding method, which further comprises the following steps:
collecting a second image of a welded area based on the LDD laser welding overall process real-time monitoring system, and processing and analyzing the second image to obtain a second type of welding defects;
wherein the second type includes one or more of a skip weld, a flash point, a dimple, and a surface pinhole.
The invention provides a soft-package battery tab welding method, which further comprises the following steps:
acquiring the height of the surface after welding and the roughness of the surface after welding;
and processing and analyzing the height of the surface after welding and the roughness of the surface after welding so as to guide the real-time online adjustment of the parameters of the laser welding process.
According to the welding method of the soft package battery tab, provided by the invention, the laser welding technological parameters further comprise the swing size and the swing frequency of the galvanometer welding head.
According to the welding method of the soft package battery tab, when the soft package battery tab and the material belt are welded by the laser emitted by the vibrating mirror welding head, protective gas is injected into the environment of the welding area formed by the soft package battery tab and the material belt.
According to the welding method for the soft package battery tab, the continuous laser with the preset power is a 1000W-2000W fundamental mode laser.
The invention also provides a soft-package battery tab welding system, which comprises: the system comprises a vibrating mirror welding head, a continuous laser with preset power and an LDD laser welding overall process real-time monitoring system, wherein the vibrating mirror welding head is connected with the continuous laser with preset power;
the laser emitted by the galvanometer welding head is used for welding a soft package battery tab and a material belt;
the LDD laser welding overall process real-time monitoring system is used for acquiring a first image of a pre-welding area, and processing and analyzing the first image to obtain related data;
the LDD laser welding overall process real-time monitoring system is also used for processing and analyzing the relevant data in real time so as to guide the real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of material, a surface finish, and a weld location.
The invention provides a method and a system for welding a soft package battery tab, wherein the method adopts laser emitted by a vibrating mirror welding head to weld the soft package battery tab and a material belt, collects a first image of a pre-welding area through an LDD laser welding overall process real-time monitoring system, and processes and analyzes the first image to obtain related data; finally, the related data are processed and analyzed in real time to guide the real-time on-line adjustment of the laser welding process parameters, so that the influence of material warping on the welding quality can be reduced, and the real-time welding seam tracking is realized; the problem of welding partially because of the assembly error identification that leads to not in place when solving notes liquid hole welding. Moreover, the continuous laser with the preset power is adopted, so that the welding efficiency can be improved, and the welding quality and the welding efficiency are ensured at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for welding a tab of a soft package battery provided by the invention;
FIG. 2 is a schematic diagram of the movement path of the galvanometer welding head provided by the present invention;
fig. 3 is a schematic structural diagram of a tab welding system of a pouch battery provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, resistance welding is generally adopted for welding a soft package battery tab, and the welding mode is mainly manual welding. Due to the manual welding operation mode, the welding effect cannot be guaranteed, the tab is often welded not firmly, and the phenomena of insufficient welding, false welding and the like are easy to occur, so that the internal resistance of the soft package battery is higher, and the reject ratio of a finished product is increased. The pulse laser is adopted for welding, although the cost is low, the welding efficiency is low, the welding quality consistency is difficult to ensure, and the welding seam position is easy to embrittle. The Mopa laser is adopted for welding, the appearance is good, the consistency is easy to ensure, but the welding efficiency is low. And adopt swing welding head cooperation laser instrument to weld, have the problem that welding efficiency is low equally, welded product per se requires comparatively much moreover, is unfavorable for going on smoothly of welding. Therefore, the embodiment of the invention provides a method for welding a tab of a soft package battery, which is used for solving the technical problems in the prior art.
Fig. 1 is a schematic flow chart of a method for welding a tab of a pouch battery provided in an embodiment of the present invention, as shown in fig. 1, the method includes:
s1, welding the soft package battery tab and the material belt by using laser emitted by a vibrating mirror welding head, wherein the vibrating mirror welding head is connected with a continuous laser with preset power;
s2, acquiring a first image of a pre-welding area based on the LDD laser welding overall process real-time monitoring system, and processing and analyzing the first image to obtain related data;
s3, processing and analyzing the relevant data in real time to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of material, a surface finish, and weld coordinates.
Specifically, the method for welding the soft-package battery tab provided by the embodiment of the invention can be realized by a soft-package battery tab welding system. The soft package battery can be a soft package lithium ion battery or other types of soft package batteries, the soft package battery comprises a positive electrode and a negative electrode, and a tab of the soft package battery refers to a metal conductor used for leading out the positive electrode and the negative electrode from a battery core of the soft package battery. Laminate polymer battery utmost point ear welding means welds laminate polymer battery utmost point ear and material area, is about to laminate polymer battery utmost point ear welding on the material area, and then realizes a plurality of laminate polymer battery series connection. The material strip may function as a conducting and current collecting function, and may be a current collecting tray or other elements, which are not specifically limited in the embodiments of the present invention.
Firstly, step S1 is executed, and the tab of the soft package battery and the material tape are welded by using the laser emitted from the galvanometer welding head. The galvanometer welding head is connected with the continuous laser with preset power, so that laser emitted by the continuous laser with preset power can be emitted by the galvanometer welding head and is applied to the lug of the soft package battery and the material belt to realize welding. The galvanometer welding head can be fixed on a support of the galvanometer platform and can deflect the direction of the emitted laser. The mirror vibration 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 mirror vibration welding head, the movable plate extends along the fixed direction, a plurality of installation positions used for fixing the material belt are arranged on the movable plate, and the installation positions are arranged at intervals along the fixed direction. During welding, the vibrating mirror welding head can be fixed, welding is achieved in a mode that the vibrating mirror welding head deflects laser, high-speed welding can be achieved, and therefore welding efficiency can be improved. And through setting up translation subassembly, realize pipelined's continuity of operation, can further improve welding efficiency. In the embodiment of the present invention, the motion trajectory of the galvanometer welding head may be actively adjusted, for example, the motion trajectory of the galvanometer welding head may be as shown in fig. 2.
And secondly, executing step S2, acquiring a first image of the pre-welding area through an LDD laser welding overall 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 LDD laser welding overall process real-time monitoring system comprises a camera and a light source. The real-time monitoring system for the whole process of LDD laser welding can perform real-time detection in a coaxial/paraxial mode with a vibrating mirror welding head.
And finally, executing step S3, performing real-time processing and analysis on the related data, and comparing the obtained material height with a preset material height, comparing the obtained material surface finish with a preset material surface finish, and comparing the obtained weld position with a preset weld position, so as to guide real-time online adjustment of the laser welding process parameters. The laser welding process parameters can include a target vertical distance between a welding area formed by a soft package battery tab and a material belt and a light outlet of the galvanometer welding head, a defocusing amount of laser emitted by the galvanometer welding head, power of a continuous laser, welding speed of the galvanometer welding head and a welding track, and the target vertical distance can be a working distance of the galvanometer welding head and is in mm. The defocusing amount unit is mm, the power unit is W, the welding speed unit is mm/s, the welding track may be a movement track of laser emitted by the galvanometer welding head, and may be set as required, for example, a straight track, a spiral track, a sine track, a cosine track, or the like, which is not specifically limited in the embodiment of the present invention.
The position of the welding seam can be inspected at the position 1-5mm before the welding seam, and the corresponding defect types can comprise clamping abnormity, mismatching, movement error, clearance abnormity and the like. In the embodiment of the invention, the defect types can be judged by taking the welding seam center line, the welding seam left edge and the welding seam right edge as evaluation criteria. The standard requirement of the target vertical distance and the diameter of a field lens in a galvanometer platform where a galvanometer welding head is located can be in a linear proportional relation, and the defect types corresponding to the target vertical distance can include defocusing, abnormal clamping, motion errors, warping, overlap 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.
The welding method for the soft package battery tab provided by the embodiment of the invention adopts laser emitted by a vibrating mirror welding head to weld the soft package battery tab and a material belt, collects a first image of a pre-welding area through an LDD laser welding overall process real-time monitoring system, and processes and analyzes the first image to obtain related data; finally, the related data are processed and analyzed in real time to guide the real-time on-line adjustment of the laser welding process parameters, so that the influence of material warping on the welding quality can be reduced, and the real-time welding seam tracking is realized; the problem of welding partially because of the assembly error identification that leads to not in place when solving notes liquid hole welding. Moreover, the continuous laser with the preset power is adopted, so that the welding efficiency can be improved, and the welding quality and the welding efficiency are ensured at the same time.
On the basis of the above embodiment, the method for welding the tab of the soft package battery provided in the embodiment of the present invention, which welds the tab of the soft package battery and the material tape 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 tab and the material belt and a light outlet of the galvanometer welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the galvanometer welding head and a welding track;
and based on the laser welding process parameters, adopting the laser to weld the soft package battery tab and the material belt.
Specifically, in the welding method for the tab of the soft package battery provided in the embodiment of the present invention, when welding is performed, first, laser welding process parameters may be determined, that is, a target vertical distance between a welding area formed by the tab of the soft package battery and the material tape and a light exit of the galvanometer welding head, a defocusing amount of laser, a power of a continuous laser, a welding speed of the galvanometer welding head, and a welding track are determined, where a value range of the target vertical distance may be determined according to a field lens diameter, for example, 150mm may be set; the value range of the defocusing amount can be set to-10 mm-10 mm; the value range of the power of the continuous laser can be set to 1000W-3000W; the value range of the welding speed of the galvanometer welding head can be set to be 0-500 mm/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 target vertical distance may be implemented by a distance measuring sensor, which is not particularly limited in the embodiment of the present invention.
And then welding the soft package battery tab 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 method for welding the tab of the soft-package battery provided in the embodiment of the invention further includes:
based on the LDD laser welding overall process real-time monitoring system, acquiring weld width data and keyhole real-time penetration data in the welding process;
and processing and analyzing the real-time penetration data and the weld width data in real time so as to guide real-time online adjustment of the laser welding process parameters.
Specifically, the LDD laser welding overall process real-time monitoring system can acquire weld width data and real-time penetration data of a keyhole in the welding process, then can perform real-time processing and analysis on the weld width data and the real-time penetration data, judge whether the weld width data is within a first preset range and whether the real-time penetration data is within a second preset range, and perform real-time online adjustment on laser welding process parameters according to a judgment result. The first preset range and the second preset range may be set according to needs, which is not specifically limited in the embodiment of the present invention.
The defect types corresponding to the real-time fusion depth data can comprise insufficient fusion depth, overlarge fusion depth and unstable process, the insufficient fusion depth means that the real-time fusion depth data is outside the second preset range and smaller than the minimum value of the second preset range, the overlarge fusion depth means that the real-time fusion depth data is outside the second preset range and larger than the maximum value of the second preset range, and the unstable process means that the real-time fusion depth data of the welding process is large in fluctuation.
In the embodiment of the invention, the laser welding quality decisive parameter data such as real-time penetration data, weld width data and the like can be detected and obtained by the LDD laser welding overall process real-time monitoring system so as to adjust the laser welding process parameters in real time. During welding, 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, in the tab welding method for the soft-package battery provided in the embodiment of the present invention, the real-time penetration data is specifically obtained in the following manner:
and emitting detection laser into the liquid molten pool, receiving the reflected signal, and acquiring the real-time fusion depth data by using an optical coherence principle.
Specifically, in the embodiment of the invention, the light source in the LDD laser welding overall process real-time monitoring system can emit the detection laser into the liquid molten pool generated in the welding process, and then receive the 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 an optical coherence principle, and can be directly calculated according to the time difference between a received reflection signal and emitted detection laser and the propagation speed of an optical signal in a 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 and further reduce the evaluation error of the laser welding quality.
On the basis of the above embodiment, the method for welding the tab of the soft-package battery provided in the embodiment of the invention further includes:
and if the real-time penetration data is judged and known to exceed the range of the set value, the LDD laser welding overall process real-time monitoring system sends out an abnormal welding seam alarm.
Specifically, after the real-time penetration data is determined, whether the real-time penetration data is within a set value range can be judged, if the real-time penetration data exceeds the set value range, the real-time penetration data is possibly welded through, and at the moment, the LDD laser welding overall process real-time monitoring system sends out an abnormal weld joint alarm to prompt a user to check the actual welding condition in time, so that adverse consequences caused by abnormal welding are reduced, and the instantaneity of abnormal treatment is guaranteed.
On the basis of the above embodiment, in the method for welding the tab of the soft package battery provided in the embodiment of the present invention, when the tab of the soft package battery and the material tape are welded by using the laser emitted from the vibrating mirror welding head, the temperature of the vibrating mirror welding head is constant.
Specifically, in the embodiment of the invention, in order to ensure the welding quality, it is required to ensure that the temperature of the galvanometer welding head is constant during welding, so that the galvanometer welding head is not damaged by the changed temperature, and the light emitting stability can be ensured, thereby ensuring the welding quality. In order to ensure the temperature of the galvanometer welding head to be constant, a temperature detection device and a temperature adjusting device can be configured, the temperature of the galvanometer welding head can be detected in real time through the temperature detection device, whether the temperature changes in the welding process is judged, and if the temperature changes, the temperature of the galvanometer welding head is adjusted through the temperature adjusting device. For example, if the temperature is increased as compared to the previous time, the temperature may be decreased by the temperature adjustment device, and if the temperature is decreased as compared to the previous time, the temperature may be increased by the temperature adjustment device. The temperature detection device can be arranged in the galvanometer welding head, or can be arranged outside the galvanometer welding head, and a probe of the temperature detection device extends into the galvanometer welding head.
On the basis of the above embodiment, the method for welding the tab of the soft-package battery provided in the embodiment of the invention further includes:
collecting a second image of a welded area based on the LDD laser welding overall process real-time monitoring system, and processing and analyzing the second image to obtain a second type of welding defects;
wherein the second type includes one or more of a skip weld, a flash point, a dimple, and a surface pinhole.
Specifically, in the embodiment of the present invention, a second image of the welded area may be acquired by a camera in the LDD laser welding overall process real-time monitoring system, and then the second image may be processed and analyzed to obtain the second type of the welding defect.
Based on computer vision, the center of the welding seam after the molten pool is formed can be determined from the second image, the recognition of NG conditions such as welding missing, explosion point and pinhole after laser welding is researched based on the center of the welding seam, and the problems of detection of the number of welding points and detection of the explosion point and welding missing defects of the soft package battery tab welding are solved; the detection problems of weld joint explosion, welding leakage and pinhole defects in sealing welding and liquid filling hole welding are solved.
It should be noted that the speckle images on the weld joint are collected, and the real appearance profile of the weld joint is obtained by combining the result of camera calibration. 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 profile of the welding seam, thereby obtaining a three-dimensional model image of the welding quality detection result.
The second type of weld defect may include excessive height, insufficient filling, craters, surface voids, and the like, and may be determined by the height of the center of the weld and the depth of fusion after welding.
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 overall process real-time monitoring system, and the second image is processed and analyzed to obtain the second type of the welding defect, so that the welding quality can be further determined to guide the real-time online adjustment of the laser welding process parameters.
On the basis of the above embodiment, the method for welding the tab of the soft-package battery provided in the embodiment of the invention further includes:
acquiring the height of the surface after welding and the roughness of the surface after welding;
and processing and analyzing the height of the surface after welding and the roughness of the surface after welding so as to guide the real-time online adjustment of the parameters of the laser welding process.
Specifically, in the embodiment of the present invention, after the welding operation is completed, the height of the welded surface and the roughness of the welded surface may be obtained, and the height of the welded surface may be compared with a set height range, the roughness of the welded surface may be compared with a preset surface roughness range, and the real-time online adjustment of the laser welding process parameter may be guided according to the comparison result, so that the height of the welded surface after the adjustment of the laser welding process parameter is within the set height range, and the roughness of the welded surface is within the preset surface roughness range, thereby ensuring the welding quality.
The cross section of the welded welding seam can be obtained by traversing the welding seam. The defect types corresponding to the cross section of the welding seam can comprise too wide welding seam, too narrow welding seam, center deviation of the welding seam and the like, and can be judged by taking the center position of the welding seam, the left edge of the welding seam, the right edge of the welding seam and the width of the welding seam as evaluation standards.
According to the method for welding the soft-package battery tab, provided by the embodiment of the invention, the welding quality can be further determined by obtaining the height of the surface after welding and the roughness of the surface after welding so as to guide the real-time online adjustment of the laser welding process parameters.
On the basis of the above embodiment, in the method for welding the soft package battery tab provided in the embodiment of the invention, the laser welding process parameters include the swing size and the swing frequency of the galvanometer welding head, and the optimal welding effect can be achieved by adjusting the swing size and the swing frequency.
On the basis of the above embodiment, in the welding method for the tab of the soft-package battery provided in the embodiment of the invention, the tab of the soft-package battery is made of copper or aluminum, and the material belt is made of copper.
Specifically, the positive electrode tab in the tab of the soft package battery is made of aluminum, the negative electrode tab is made of copper, and the material strap is made of copper with good conductivity. According to the experimental result, the aluminum tab with the thickness of 0.4mm is obtained, and the welding reserved gap is 0mm, the tensile force which can be borne by the tab and the material belt of the soft package battery after welding is 1150-1300N, and the effective penetration is 0.8-2 mm; 0.4mm of aluminum tab, and the welding reserved gap is 0.15mm, the tensile force which can be borne by the tab and the material belt of the soft package battery after welding is 1050 plus 1200N, and the effective fusion depth is 0.7-2 mm; the copper tab with the thickness of 0.3mm and the welding reserved gap are 0mm, the pulling force which can be borne by the tab and the material belt of the soft package battery after welding is 1450 and 1600N, and the effective fusion depth is 0.8-1.5 mm; and (3) a copper tab with the thickness of 0.3mm, and the welding reserved gap is 0.15mm, the tensile force which can be borne by the tab and the material belt of the soft package battery after welding is 1300-1500N, and the effective fusion depth is 0.7-1.2 mm. All can pass through the tensile test above the condition to can guarantee to melt deeply and can not weld and wear the material area.
On the basis of the above embodiment, in the method for welding the tab of the soft package battery provided in the embodiment of the present invention, when the tab of the soft package battery and the material tape are welded by using the laser emitted from the galvanometer welding head, a protective gas is injected into an environment in which a welding area formed by the tab of the soft package battery and the material tape is located.
Specifically, when welding is performed, a protective gas may be injected in an environment in which the welding area is located to prevent the material of the welding area from being oxidized during welding, and at the same time, the resulting weld brightness may be improved. The protective gas may be nitrogen, helium, or the like, which is not particularly limited in the embodiments of the present invention.
On the basis of the above embodiment, in the tab welding method for the soft package battery provided in the embodiment of the invention, the continuous laser with the preset power is specifically a 1000W-2000W fundamental mode laser.
Specifically, in the embodiment of the present invention, the continuous laser may be a fundamental mode laser, and a value range of the preset power may be 1000W to 2000W, and may preferably be 1500W.
In the embodiment of the invention, a high-power continuous laser is adopted, so that the welding efficiency of the tab welding of the soft-package battery can be ensured. And high-quality welding can be realized by matching with a vibrating mirror welding head and an LDD laser welding overall process real-time monitoring system.
As shown in fig. 3, on the basis of the above embodiment, an embodiment of the present invention provides a tab welding system for a pouch battery, including: the laser welding system comprises a vibrating mirror welding head 31, a continuous laser 32 with preset power and an LDD laser welding overall process real-time monitoring system 33, wherein the vibrating mirror welding head 31 is connected with the continuous laser 32 with preset power;
the laser emitted by the galvanometer welding head 31 is used for welding a soft package battery tab and a material belt;
the LDD laser welding overall process real-time monitoring system 33 is configured to collect a first image of a pre-welding area, process and analyze the first image to obtain related data;
the LDD laser welding overall process real-time monitoring system 33 is further configured to process and analyze the relevant 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 material, a surface finish, and a weld location.
Specifically, the functions and the work flows of the elements in the tab welding system for the soft-package battery provided in the embodiment of the present invention are the same as those in the above method embodiments, and the implementation effects are also the same.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A soft package battery tab welding method is characterized by comprising the following steps:
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;
collecting a first image of a pre-welding area based on an LDD laser welding overall process real-time monitoring system, and processing and analyzing the first image to obtain related data;
processing and analyzing the related data in real time to guide real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of material, a surface finish, and a weld location.
2. The method for welding the soft package battery tab according to claim 1, wherein the laser emitted by the galvanometer welding head is used for welding the soft package battery tab and the material belt, and 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 tab and the material belt and a light outlet of the galvanometer welding head, the defocusing amount of the laser, the power of the continuous laser, the welding speed of the galvanometer welding head and a welding track;
and based on the laser welding process parameters, adopting the laser to weld the soft package battery tab and the material belt.
3. The method for welding the soft package battery tab according to claim 1, further comprising:
based on the LDD laser welding overall process real-time monitoring system, acquiring weld width data and keyhole real-time penetration data in the welding process;
and processing and analyzing the real-time penetration data and the weld width data in real time so as to guide real-time online adjustment of the laser welding process parameters.
4. The method for welding the soft package battery tab according to claim 1, wherein the temperature of the galvanometer welding head is constant when the laser emitted by the galvanometer welding head is used for welding the soft package battery tab and the material belt.
5. The method for welding the soft package battery tab according to claim 1, further comprising:
collecting a second image of a welded area based on the LDD laser welding overall process real-time monitoring system, and processing and analyzing the second image to obtain a second type of welding defects;
wherein the second type includes one or more of a skip weld, a flash point, a dimple, and a surface pinhole.
6. The method for welding the soft package battery tab according to claim 1, further comprising:
acquiring the height of the surface after welding and the roughness of the surface after welding;
and processing and analyzing the height of the surface after welding and the roughness of the surface after welding so as to guide the real-time online adjustment of the parameters of the laser welding process.
7. The soft-package battery tab welding method according to any one of claims 1-6, characterized in that the laser welding process parameters further comprise the swing size and swing frequency of a vibrating mirror welding head.
8. The method for welding the soft-package battery tab according to any one of claims 1 to 6, wherein when the soft-package battery tab and the material belt are welded 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 soft-package battery tab and the material belt is located.
9. The laminate battery tab welding method according to any one of claims 1 to 6, characterized in that the continuous laser with the preset power is a 1000W-2000W fundamental mode laser.
10. The utility model provides a laminate polymer battery utmost point ear welding system which characterized in that includes: the system comprises a vibrating mirror welding head, a continuous laser with preset power and an LDD laser welding overall process real-time monitoring system, wherein the vibrating mirror welding head is connected with the continuous laser with preset power;
the laser emitted by the galvanometer welding head is used for welding a soft package battery tab and a material belt;
the LDD laser welding overall process real-time monitoring system is used for acquiring a first image of a pre-welding area, and processing and analyzing the first image to obtain related data;
the LDD laser welding overall process real-time monitoring system is also used for processing and analyzing the relevant data in real time so as to guide the real-time online adjustment of laser welding process parameters;
wherein the relevant data includes one or more of a height of material, a surface finish, and a weld location.
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