CN113909692A - Laser welding method and device based on alternating welding and pressing - Google Patents
Laser welding method and device based on alternating welding and pressing Download PDFInfo
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- CN113909692A CN113909692A CN202111142358.4A CN202111142358A CN113909692A CN 113909692 A CN113909692 A CN 113909692A CN 202111142358 A CN202111142358 A CN 202111142358A CN 113909692 A CN113909692 A CN 113909692A
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- 238000003466 welding Methods 0.000 title claims abstract description 464
- 238000003825 pressing Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004590 computer program Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 7
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 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
- B23K26/22—Spot 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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0869—Devices involving movement of the laser head in at least one axial direction
- B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
- B23K26/0884—Devices involving movement of the laser head in at least one axial direction in at least two axial directions in at least in three axial directions, e.g. manipulators, robots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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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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Abstract
The invention provides a laser welding method and device based on alternative welding pressure, wherein the method comprises the steps of obtaining image information of a plurality of welding points on the upper surface of a battery module; determining coordinate information of each welding point according to the image information; and controlling a pressure head of the first welding device and a pressure head of the second welding device to alternately press the plurality of welding points in sequence according to the coordinate information, and controlling a laser welding device to laser weld the welding points corresponding to the pressure head which is kept in a pressing state in sequence. The invention realizes the synchronous operation of the pressing action and the laser welding action of the pressure head, reduces the waiting time of the laser welding device, improves the utilization rate of the laser and further improves the welding efficiency.
Description
Technical Field
The invention relates to the technical field of battery processing, in particular to a laser welding method and device based on alternating welding and pressing.
Background
According to different application scenes, the voltage and the current which need to be output when the battery pack normally works have different requirements under different conditions. At present, when high voltage and high current are needed, a commonly-adopted battery structure is a PACK structure, namely, a plurality of battery cells are connected with each other, so that the output voltage and current of the battery cells meet the requirements of electrical elements, and then the battery cells are packaged by PACKs. The connection mode of the battery cell comprises the following three modes: the battery cells are all connected in series, the battery cells are all connected in parallel, and the battery cells are connected in series and parallel.
Currently, when a plurality of battery cells are connected by a bus bar, welding work for a plurality of welding points is involved. For these welding points, welding is generally performed as follows: firstly, controlling a pressure head of a welding pressure device to move to the upper side of a target welding point; then, controlling a pressure head of the welding pressure device to press down to compress the target welding point; then, moving the welding gun head to a target welding point, and starting welding operation; and finally, sequentially circulating according to the steps to finish the welding operation of each welding point. However, in actual welding, it is found that the pressure head welding action of the welding pressure device and the laser welding of the welding gun head cannot be performed synchronously, the utilization rate of the laser is not high, and the laser welding efficiency is seriously affected.
Disclosure of Invention
The invention provides a laser welding method and device based on alternating welding pressure, which are used for solving the problem of low welding efficiency when a plurality of welding points of a battery module are subjected to laser welding at present.
The invention provides a laser welding method based on alternating welding pressure, which comprises the following steps: s1, acquiring image information of a plurality of welding points on the upper surface of the battery module; s2, determining coordinate information of each welding point according to the image information; and S3, controlling the pressure head of the first welding device and the pressure head of the second welding device to alternately press the plurality of welding points in sequence according to the coordinate information, and controlling the laser welding device to laser weld the welding points corresponding to the pressure head which keeps the pressing state in sequence.
According to the laser welding method based on the alternating welding pressure, the step S2 further includes: establishing a coordinate system according to a preset coordinate origin and a first reference point and a second reference point on the upper surface; processing the image information to acquire a first distance of each welding point relative to the first reference point and a second distance of each welding point relative to the second reference point; determining coordinate information of each welding point relative to the origin of coordinates according to the first distance and the second distance; and the distance between the first reference point and the second reference point is a preset value.
According to the laser welding method based on the alternating welding pressure, the step S3 further includes: s31, controlling a pressure head of the first welding device to press the ith welding point according to the coordinate information of the ith welding point; s32, when the pressure head of the first welding device keeps a pressure state on the ith welding point, controlling the welding head of the laser welding device to move to the ith welding point according to the coordinate information of the ith welding point, and controlling the pressure head of the second welding device to move to the position above the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point; s33, controlling a pressure head of the second welding device to press the (i + 1) th welding point, starting the laser welding device, and performing laser welding on the (i) th welding point; s34, when the pressure head of the second welding device keeps a pressure state on the (i + 1) th welding point, controlling the welding head of the laser welding device to move to the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point, and controlling the pressure head of the first welding device to move above the (i + 2) th welding point according to the coordinate information of the (i + 2) th welding point; s35, controlling a pressure head of the first welding device to press the (i + 2) th welding point, starting the laser welding device, and performing laser welding on the (i + 1) th welding point; performing laser welding on the welding points in sequence according to the circulation from S31 to S35; wherein the welding points comprise a 1 st welding point to an Nth welding point, i is not less than 1 and not more than N, and i is a positive integer.
According to the laser welding method based on the alternating welding pressure, before the step S1, the method further includes: correcting the position and the posture of the battery module, and fixing the corrected battery module; in step S3, when the laser welding device performs laser welding on the welding point, the method further includes: controlling welding parameters of a laser welding device, wherein the welding parameters comprise pulse energy, pulse frequency, pulse width, pulse time and output power of laser output laser of a laser connected with a welding head, and an inclination angle and defocusing amount of the welding head relative to the welding point.
The invention also provides a laser welding device based on the alternating welding, which comprises: the device comprises a battery conveying line, a first welding and pressing device, a second welding and pressing device, a laser welding device, a camera module and a control module; the camera module is in communication connection with the control module, and the control module is in communication connection with the first welding and pressing device, the second welding and pressing device and the laser welding device respectively; the control module stores a computer program, and when executing the computer program, the control module realizes the steps of the laser welding method based on the alternating welding pressure; the battery conveying line is used for conveying a battery module to the lower sides of the first welding and pressing device, the second welding and pressing device and the laser welding device; the pressure head of the first welding and pressing device and the pressure head of the second welding and pressing device are used for pressing the welding point on the battery module; the laser welding device is used for performing laser welding on the welding points; the camera module is arranged on the upper side of the battery conveying line and used for collecting image information of a plurality of welding points on the upper surface of the battery module.
According to the laser welding device based on the alternating welding, the first welding device and the second welding device have the same structure and respectively comprise: the lifting mechanism comprises a first straight line module, a second straight line module and a lifting cylinder; the sliding table of the first linear module is used for reciprocating along the X-axis direction; the sliding table of the second linear module is used for reciprocating along the Y-axis direction; the telescopic end of the lifting cylinder is used for lifting along the Z-axis direction; the second linear module is arranged on the sliding table of the first linear module; the lifting cylinder is arranged on the sliding table of the second linear module, and the telescopic end of the lifting cylinder is arranged downwards and is connected with the pressure head; wherein the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
According to the laser welding device based on the alternating welding and pressing, which is provided by the invention, the laser welding device comprises a third linear module, a fourth linear module, a fifth linear module and a welding head; the sliding table of the third linear module is used for reciprocating along the X-axis direction; the sliding table of the fourth linear module is used for reciprocating along the Y-axis direction; the sliding table of the fifth linear module is used for reciprocating along the Z-axis direction; the third straight line module is arranged on the sliding table of the fourth straight line module, the fifth straight line module is arranged on the sliding table of the third straight line module, and the welding joint is arranged on the sliding table of the fifth straight line module.
According to the laser welding device based on the alternating welding pressure, the invention further comprises: the device comprises a first pushing device and a second pushing device; the battery conveying lines are arranged along the X-axis direction, and the first pushing device and the second pushing device are oppositely arranged along the Y-axis direction and are respectively arranged on the opposite sides of the battery conveying lines; the first pushing device and the second pushing device are used for correcting the position and the posture of the battery module on the battery conveying line.
According to the laser welding device based on the alternating welding and pressing, the battery conveying line comprises a roller conveying line; and/or, set the tray on the battery conveying line, be equipped with a plurality of frock holes on the tray, the tray passes through the frock hole is connected with frock clamp, frock clamp is used for with the battery module is fixed on the tray.
The present invention further provides an electronic device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the laser welding method based on alternating pressure welding as described in any one of the above.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for alternating pressure based laser welding as described in any of the above.
According to the alternating welding-based laser welding method and device, the pressure head of the first welding-pressing device and the pressure head of the second welding-pressing device can sequentially and alternately press a plurality of welding points of the battery module, and the laser welding device is controlled to sequentially perform laser welding on the welding points corresponding to the pressure head in the pressing state, so that the pressing action of the pressure head and the laser welding action are synchronously performed, the waiting time of a laser corresponding to the laser welding device is shortened, the utilization rate of the laser is improved, and the welding efficiency is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an alternative welding pressure based laser welding method provided by the present invention;
FIG. 2 is a schematic structural diagram of an alternative welding-pressure-based laser welding device provided by the invention;
FIG. 3 is a second schematic structural diagram of an alternative welding-based laser welding apparatus according to the present invention;
FIG. 4 is a third schematic structural diagram of an alternative welding-based laser welding apparatus according to the present invention;
FIG. 5 is a schematic structural diagram of an electronic device provided by the present invention;
reference numerals:
1: a first welding and pressing device; 2: a second welding and pressing device; 3: a laser welding device;
4: a battery conveyor line; 5: a tray; 6: a first pushing device;
7: a second pushing device; 8: a battery module; 11: a first linear module;
12: a second linear module; 13: a lifting cylinder; 31: a third linear module;
32: a fourth linear module; 33: a fifth linear module; 34: and (5) welding a head.
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.
A laser welding method and apparatus based on alternating pressure welding according to the present invention will be described with reference to fig. 1 to 5.
As shown in fig. 1, the present embodiment provides a laser welding method based on alternating pressure welding, including the following steps:
and S1, acquiring image information of a plurality of welding points on the upper surface of the battery module.
The battery module shown in the embodiment is placed on a battery conveying line, and a plurality of welding points are formed between the pole and the busbar of each single battery in the battery module. In this embodiment, the image information of the plurality of welding points can be acquired by using an image pickup module such as a CCD camera provided on the upper side of the battery transport line. In order to ensure that a larger image collection visual angle is obtained, the lens of the camera module is arranged vertically downwards and extends to the upper surface of the battery module.
And S2, determining the coordinate information of each welding point according to the image information.
The present embodiment may process the image information by using an image recognition algorithm known in the art, and may obtain coordinate information of each welding point while performing feature recognition on each welding point, so as to prepare for subsequent laser welding of each welding point.
S3, controlling the pressure head of the first welding device and the pressure head of the second welding device to alternately press a plurality of welding points in sequence according to the coordinate information, and controlling the welding head of the laser welding device to laser weld the welding points corresponding to the pressure head which keeps the pressing state in sequence; the pressure head has a pressing state of contacting with the welding point and a separating state of separating from the welding point.
Specifically, when pressing a plurality of welding points in turn, can be that the pressure head of first welding device presses first welding point earlier, and the pressure head of second welding device presses second welding point again, and the pressure head of first welding device presses third welding point again, and the pressure head of second welding device presses fourth welding point again, so circulation in turn, presses other welding points in proper order. Here, this embodiment has realized that the action of pressing of pressure head and laser welding action go on in step based on the coordinate information of each welding point, has reduced the latency of the laser instrument that laser welding device corresponds, has improved the utilization ratio of laser instrument, and then has improved welding efficiency.
Further, step S2 shown in the present embodiment includes, but is not limited to, the following steps:
and S21, establishing a coordinate system according to a preset coordinate origin and the first reference point and the second reference point on the upper surface.
In this embodiment, the distance between the first reference point and the second reference point is a preset value. Under the condition that the distance between the first reference point and the second reference point is known, if the origin of coordinates is distributed on the upper surface of the battery module, a plane coordinate system based on the upper surface of the battery module can be established based on the origin of coordinates, the first reference point and the second reference point; if the origin of coordinates is not distributed on the upper surface of the battery module, a three-dimensional space coordinate system can be established based on the origin of coordinates, the first reference point and the second reference point.
Here, the first reference point and the second reference point shown in this embodiment may be two feature points on the upper surface of the battery module, which are convenient to identify, for example, the first reference point and the second reference point are two corner points on a diagonal line on the upper surface, respectively.
And S22, processing the image information to obtain a first distance of each welding point relative to a first reference point and a second distance relative to a second reference point.
The present embodiment may process the image information by using an image recognition algorithm known in the art to perform feature recognition on each welding point, so as to calculate a first distance of the welding point relative to a first reference point and a second distance of the welding point relative to a second reference point.
And S23, determining coordinate information of each welding point relative to the coordinate origin according to the first distance and the second distance.
Under the condition that the coordinate origin, the first reference point and the second reference point are determined, the coordinate information of each welding point relative to the coordinate origin can be acquired through a geometric algorithm according to the first distance of each welding point relative to the first reference point and the second distance of each welding point relative to the second reference point.
Further, step S3 shown in the present embodiment includes, but is not limited to, the following steps:
and S31, controlling a pressure head of the first welding device to press the ith welding point according to the coordinate information of the ith welding point.
And S32, when the pressure head of the first welding device keeps a pressure state on the ith welding point, controlling the welding head of the laser welding device to move to the ith welding point according to the coordinate information of the ith welding point, and controlling the pressure head of the second welding device to move to the position above the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point.
And S33, controlling a pressure head of the second welding device to press the (i + 1) th welding point, and starting the laser welding device to perform laser welding on the (i) th welding point.
And S34, when the pressure head of the second welding device keeps a pressure state on the (i + 1) th welding point, controlling the welding head of the laser welding device to move to the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point, and controlling the pressure head of the first welding device to move to the position above the (i + 2) th welding point according to the coordinate information of the (i + 2) th welding point.
And S35, controlling a pressure head of the first welding device to press the (i + 2) th welding point, and starting the laser welding device to perform laser welding on the (i + 1) th welding point.
Performing laser welding on a plurality of welding points in sequence according to the circulation from S31 to S35; wherein the welding points comprise a 1 st welding point to an Nth welding point, i is more than or equal to 1 and less than or equal to N, and i is a positive integer. Here, the value of N may be 150-.
Based on the scheme shown in the above embodiment, in order to facilitate the improvement of the welding efficiency of each welding point, this embodiment can be distributed according to each welding point, that is, according to the position of each welding point away from the first welding device and the second welding device, a plurality of welding points are numbered as the 1 st welding point, the 2 nd welding point, … …, the ith welding point, … … and the nth welding point in sequence. Therefore, the pressing head of the first welding device can press one part of the plurality of welding points close to the position of the pressing head, and the pressing head of the second welding device can press the other part of the plurality of welding points close to the position of the pressing head, so that the alternative pressing operation of the welding points can be sequentially executed.
In one embodiment, when i ═ 1, the present embodiment can perform the following welding step:
firstly, controlling a pressure head of the first welding and pressing device to move to the position right above the 1 st welding point, and then controlling the pressure head of the first welding and pressing device to press the 1 st welding point downwards.
Then, when a pressure head of the first welding device keeps a pressing state on the 1 st welding point, controlling a welding head of the laser welding device to move to the 1 st welding point according to the coordinate information of the 1 st welding point; in the process, the pressure head of the second welding device is controlled to move above the 2 nd welding point according to the coordinate information of the 2 nd welding point.
Then, controlling a pressure head of a second welding and pressing device to press a 2 nd welding point; in this process, the laser welding apparatus is activated to laser weld the 1 st welding point.
Then, when a pressure head of the second welding device keeps a pressing state on the 2 nd welding point, controlling a welding head of the laser welding device to move to the 2 nd welding point according to the coordinate information of the 2 nd welding point; in the process, the pressure head of the first welding device is controlled to move above the 3 rd welding point according to the coordinate information of the 3 rd welding point.
Then, controlling a pressure head of the first welding and pressing device to press a No. 3 welding point; in this process, the laser welding apparatus is activated to laser weld the 2 nd welding point.
And performing laser welding on the fourth welding point to the Nth welding point in sequence according to the cyclic execution of the steps.
Further, in order to ensure the welding quality of each welding point on the battery module, the laser welding method of the present embodiment further includes, before step S1: and correcting the position and the posture of the battery module, and fixing the corrected battery module.
It should be noted here that the present embodiment can also control the welding parameters of the laser welding apparatus when performing laser welding on each welding point, the welding parameters including pulse energy, pulse frequency, welding pulse width, pulse time, output power of the laser output laser connected to the welding head, and the inclination and defocus of the welding head with respect to the welding point. Here, the inclination angle represents an angle of a central axis of the welding head with respect to an upper surface of the battery module, and the defocus amount represents a distance between an end of the welding head and the welding point.
As shown in fig. 2 to 4, based on the solutions shown in the above embodiments, the present embodiment further provides a laser welding apparatus based on the alternating welding, including: the device comprises a battery conveying line 4, a first welding and pressing device 1, a second welding and pressing device 2, a laser welding device 3, a camera module and a control module. Wherein, two welding stations are illustrated in fig. 2 to 4, the two welding stations share one set of laser welding device 3, each welding station is provided with a battery conveying line 4, a first welding and pressing device 1 and a second welding and pressing device 2, and the camera module is not specifically illustrated in each welding station.
Specifically, the camera module shown in this embodiment is in communication connection with a control module, and the control module is in communication connection with the first welding and pressing device 1, the second welding and pressing device 2, and the laser welding device 3, respectively; the control module stores a computer program, which when executed implements the steps of the alternating welding-based laser welding method described above.
The battery conveying line 4 is used for conveying the battery module 8 to the lower sides of the first welding and pressing device 1, the second welding and pressing device 2 and the laser welding device 3; the pressure head of the first welding and pressing device 1 and the pressure head of the second welding and pressing device 2 are used for pressing the welding point on the battery module 8; the laser welding device 3 is used for performing laser welding on the butt joint; the upside of battery transfer chain 4 is located to the module of making a video recording to be used for gathering the image information of a plurality of welding points of the upper surface of battery module 8.
Since the apparatus shown in this embodiment adopts the method shown in the foregoing embodiment, this embodiment includes all technical solutions of the foregoing embodiment, and therefore, at least all beneficial effects brought by the technical solutions of the foregoing embodiment are achieved, and are not described in detail herein.
It should be noted that the camera module shown in the present embodiment may be a CCD camera known in the art. The control module shown in this embodiment may be a PLC controller or an industrial personal computer known in the art. The indenter shown in this embodiment is provided with a through hole or notch for the welding head 34 to weld the butt joint.
Further, in order to facilitate the arrangement and realize the alternate pressing of the plurality of welding points in sequence, the first welding-pressure device 1 and the second welding-pressure device 2 are designed to have the same structure in the present embodiment.
As shown in fig. 4, the first bonding-pressure device 1 includes: a first straight line module 11, a second straight line module 12 and a lifting cylinder 13. The sliding table of the first linear module 11 is used for reciprocating along the X-axis direction; the sliding table of the second linear module 12 is used for reciprocating along the Y-axis direction; the telescopic end of the lifting cylinder 13 is used for lifting along the Z-axis direction; the second linear module 12 is arranged on the sliding table of the first linear module 11; the lift cylinder 13 is arranged on the sliding table of the second linear module 12, and the telescopic end of the lift cylinder 13 is arranged downwards and connected with the pressure head. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other, and the directions of the X-axis, the Y-axis, and the Z-axis are specifically illustrated in fig. 4.
Preferably, as shown in fig. 4, the laser welding device 3 of the present embodiment includes a third linear module 31, a fourth linear module 32, a fifth linear module 33, and a welding head 34; the sliding table of the third linear module 31 is used for reciprocating along the X-axis direction; the sliding table of the fourth linear module 32 is used for reciprocating along the Y-axis direction; the sliding table of the fifth linear module 33 is used for reciprocating along the Z-axis direction; the third linear module 31 is arranged on the sliding table of the fourth linear module 32, the fifth linear module 33 is arranged on the sliding table of the third linear module 31, and the welding head 34 is arranged on the sliding table of the fifth linear module 33. In this embodiment, an adjusting bracket may be disposed on the sliding table of the fifth linear module 33, and the welding head 34 is mounted on the adjusting bracket, so that the welding angle of the welding head 34 can be adjusted by the adjusting bracket.
Preferably, in order to correct the position and the posture of the battery module 8 on the battery conveying line 4, the present embodiment is further provided with a first pushing device 6 and a second pushing device 7; the battery conveying lines 4 are arranged along the X-axis direction, and the first pushing device 6 and the second pushing device 7 are oppositely arranged along the Y-axis direction and are respectively arranged at the opposite sides of the battery conveying lines 4.
Specifically, the first pushing device 6 and the second pushing device 7 shown in this embodiment have the same structure, and both may be composed of a horizontal cylinder and a pushing head, the pushing head is installed at the telescopic end of the horizontal cylinder, and the pushing head of the first pushing device 6 and the pushing head of the second pushing device 7 are arranged oppositely along the Y-axis direction.
Here, the battery transport line 4 shown in the present embodiment is preferably a roller transport line. The position and orientation of the battery module 8 can be corrected with the aid of the first pushing device 6 and the second pushing device 7 when the mass of the battery module 8 is relatively large, and the position and orientation of the battery module 8 can also be corrected manually when the mass of the battery module 8 is relatively small.
Further, in order to ensure that the butt welding point presses or laser welding's in-process, the position of welding point remains unchanged to ensure the welding quality of butt welding point, this embodiment has set tray 5 on battery transfer chain 4, is equipped with a plurality of frock holes on tray 5, and tray 5 passes through the frock hole to be connected with frock clamp, and frock clamp is used for fixing battery module 8 on tray 5.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform an alternate bond pressure based laser welding method comprising: acquiring image information of a plurality of welding points on the upper surface of the battery module; determining coordinate information of each welding point according to the image information; according to the coordinate information, controlling a pressure head of a first welding device and a pressure head of a second welding device to sequentially and alternately press the plurality of welding points, and controlling a laser welding device to sequentially and laser weld the welding points corresponding to the pressure head which is kept in a pressing state; wherein the pressure head has a pressing state in contact with the welding point and a separated state in separation from the welding point.
Furthermore, the logic instructions in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform the method for laser welding based on alternating pressure provided by the above methods, the method comprising: acquiring image information of a plurality of welding points on the upper surface of the battery module; determining coordinate information of each welding point according to the image information; according to the coordinate information, controlling a pressure head of a first welding device and a pressure head of a second welding device to sequentially and alternately press the plurality of welding points, and controlling a laser welding device to sequentially and laser weld the welding points corresponding to the pressure head which is kept in a pressing state; wherein the pressure head has a pressing state in contact with the welding point and a separated state in separation from the welding point.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the method for laser welding based on alternating pressure welding provided above, the method comprising: acquiring image information of a plurality of welding points on the upper surface of the battery module; determining coordinate information of each welding point according to the image information; according to the coordinate information, controlling a pressure head of a first welding device and a pressure head of a second welding device to sequentially and alternately press the plurality of welding points, and controlling a laser welding device to sequentially and laser weld the welding points corresponding to the pressure head which is kept in a pressing state; wherein the pressure head has a pressing state in contact with the welding point and a separated state in separation from the welding point.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 (9)
1. A laser welding method based on alternating welding pressure is characterized by comprising the following steps:
s1, acquiring image information of a plurality of welding points on the upper surface of the battery module;
s2, determining coordinate information of each welding point according to the image information;
and S3, controlling the pressure head of the first welding device and the pressure head of the second welding device to alternately press the plurality of welding points in sequence according to the coordinate information, and controlling the laser welding device to laser weld the welding points corresponding to the pressure head which keeps the pressing state in sequence.
2. The alternating weld-pressure based laser welding method according to claim 1, wherein the step S2 further includes:
establishing a coordinate system according to a preset coordinate origin and a first reference point and a second reference point on the upper surface;
processing the image information to acquire a first distance of each welding point relative to the first reference point and a second distance of each welding point relative to the second reference point;
determining coordinate information of each welding point relative to the origin of coordinates according to the first distance and the second distance;
and the distance between the first reference point and the second reference point is a preset value.
3. The alternating weld-pressure based laser welding method according to claim 1, wherein the step S3 further includes:
s31, controlling a pressure head of the first welding device to press the ith welding point according to the coordinate information of the ith welding point;
s32, when the pressure head of the first welding device keeps a pressure state on the ith welding point, controlling the welding head of the laser welding device to move to the ith welding point according to the coordinate information of the ith welding point, and controlling the pressure head of the second welding device to move to the position above the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point;
s33, controlling a pressure head of the second welding device to press the (i + 1) th welding point, and controlling the laser welding device to perform laser welding on the (i) th welding point;
s34, when the pressure head of the second welding device keeps a pressure state on the (i + 1) th welding point, controlling the welding head of the laser welding device to move to the (i + 1) th welding point according to the coordinate information of the (i + 1) th welding point, and controlling the pressure head of the first welding device to move above the (i + 2) th welding point according to the coordinate information of the (i + 2) th welding point;
s35, controlling a pressure head of the first welding device to press the (i + 2) th welding point, and controlling the laser welding device to perform laser welding on the (i + 1) th welding point;
performing laser welding on the welding points in sequence according to the circulation from S31 to S35;
wherein the welding points comprise a 1 st welding point to an Nth welding point, i is not less than 1 and not more than N, and i is a positive integer.
4. The laser welding method based on the alternating pressure welding according to any one of claims 1 to 3, characterized in that, before step S1, the method further comprises: correcting the position and the posture of the battery module, and fixing the corrected battery module;
in step S3, when the laser welding device performs laser welding on the welding point, the method further includes: controlling welding parameters of a laser welding device, wherein the welding parameters comprise pulse energy, pulse frequency, pulse width, pulse time and output power of laser output laser of a laser connected with a welding head, and an inclination angle and defocusing amount of the welding head relative to the welding point.
5. A laser welding device based on alternative welding and pressing is characterized in that,
the method comprises the following steps: the device comprises a battery conveying line, a first welding and pressing device, a second welding and pressing device, a laser welding device, a camera module and a control module;
the camera module is in communication connection with the control module, and the control module is in communication connection with the first welding and pressing device, the second welding and pressing device and the laser welding device respectively;
the control module stores a computer program, and when executing the computer program, the control module realizes the steps of the alternating pressure-based laser welding method according to any one of claims 1 to 4;
the battery conveying line is used for conveying a battery module to the lower sides of the first welding and pressing device, the second welding and pressing device and the laser welding device; the pressure head of the first welding and pressing device and the pressure head of the second welding and pressing device are used for pressing the welding point on the battery module; the laser welding device is used for performing laser welding on the welding points; the camera module is arranged on the upper side of the battery conveying line and used for collecting image information of a plurality of welding points on the upper surface of the battery module.
6. The alternating pressure welding-based laser welding device according to claim 5, wherein the first pressure welding device and the second pressure welding device are identical in structure and each comprise: the lifting mechanism comprises a first straight line module, a second straight line module and a lifting cylinder;
the sliding table of the first linear module is used for reciprocating along the X-axis direction; the sliding table of the second linear module is used for reciprocating along the Y-axis direction; the telescopic end of the lifting cylinder is used for lifting along the Z-axis direction; the second linear module is arranged on the sliding table of the first linear module; the lifting cylinder is arranged on the sliding table of the second linear module, and the telescopic end of the lifting cylinder is arranged downwards and is connected with the pressure head;
wherein the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
7. The alternating weld pressure based laser welding device according to claim 6, wherein the laser welding device comprises a third linear module, a fourth linear module, a fifth linear module and a welding head;
the sliding table of the third linear module is used for reciprocating along the X-axis direction; the sliding table of the fourth linear module is used for reciprocating along the Y-axis direction; the sliding table of the fifth linear module is used for reciprocating along the Z-axis direction; the third straight line module is arranged on the sliding table of the fourth straight line module, the fifth straight line module is arranged on the sliding table of the third straight line module, and the welding joint is arranged on the sliding table of the fifth straight line module.
8. The alternating weld-pressure based laser welding apparatus according to claim 6, further comprising: the device comprises a first pushing device and a second pushing device;
the battery conveying lines are arranged along the X-axis direction, and the first pushing device and the second pushing device are oppositely arranged along the Y-axis direction and are respectively arranged on the opposite sides of the battery conveying lines; the first pushing device and the second pushing device are used for correcting the position and the posture of the battery module on the battery conveying line.
9. The alternate weld pressure based laser welding apparatus according to claim 8, wherein the battery transport line includes a roller transport line;
and/or, set the tray on the battery conveying line, be equipped with a plurality of frock holes on the tray, the tray passes through the frock hole is connected with frock clamp, frock clamp is used for with the battery module is fixed on the tray.
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