CN116021155A

CN116021155A - Pole welding method and device

Info

Publication number: CN116021155A
Application number: CN202310184927.4A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Guangdong Lyric Robot Automation Co Ltd
Current assignee: Guangdong Lyric Robot Automation Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-04-28

Abstract

The application discloses a pole welding method and equipment, and relates to the technical field of battery processing, wherein the welding method is to acquire position information of a core winding hole from a negative electrode end of a battery to be welded; according to the position information of the core hole, the position of the battery to be welded is adjusted until the position of the core hole corresponds to the position of the preset laser beam; a laser beam is emitted from the negative electrode end of the battery to be welded into the core winding hole, and the current collecting disc in the positive electrode end of the battery to be welded is welded through to form a molten pool, so that the current collecting disc at the positive electrode end and the positive electrode post are welded together, the positive electrode post with larger thickness is not required to be welded through, the current collecting disc and the positive electrode post are welded together, and the defective rate is reduced. And when welding lines or welding marks appear on the outer surface of the positive pole, the battery can be judged to be defective, compared with the traditional process design, the battery manufactured by adopting the welding method designed by the application is simpler and faster in defective test, lower in error rate and higher in efficiency.

Description

Pole welding method and device

Technical Field

The application relates to the technical field of battery processing, in particular to a pole welding method and equipment.

Background

In the prior art, most of the welding of the positive pole of the cylindrical battery adopts laser to melt the pole from the outside to form a molten pool, so that the laser can pass through the pole and weld a current collecting disc positioned at the inner side of the pole, and then the pole and the current collecting disc are welded together. However, in the mode, the thickness of the pole is far greater than that of the current collecting disc, the laser energy density penetrating through the pole is high, the power of laser is difficult to accurately control, the current collecting disc is easy to weld through, defective products are caused, and particularly, the situation is very easy to occur in the welding of the positive pole of a large-size cylindrical battery. In addition, when judging defective products, the welding mode needs to judge welding quality through CCD appearance detection and then judging welding positions, welding widths, pixel values and the like through images, the detection and judgment process is complex, judgment errors are easy to occur, and the efficiency is low.

Disclosure of Invention

In view of this, the purpose of this application is to provide utmost point post welding method and equipment, reduces the defective products rate, and judges simply swiftly more to the battery defective products after the welding, and the error rate is lower, and efficiency is higher.

In order to achieve the technical purpose, the application provides a pole welding method, which comprises the following steps:

acquiring position information of a core winding hole from a negative electrode end of a battery to be welded;

according to the position information of the winding core hole, the position of the battery to be welded is adjusted until the position of the winding core hole corresponds to the position of a preset laser beam;

and emitting laser beams from the negative electrode end of the battery to be welded into the core winding hole, and welding through the current collecting disc in the positive electrode end of the battery to be welded to form a molten pool so that the current collecting disc in the positive electrode end and the positive electrode post are welded together.

Further, the step of obtaining the position information of the winding core hole from the negative electrode terminal of the battery to be welded specifically includes the steps of:

acquiring i groups of negative electrode end image information of a battery to be welded, wherein each group of negative electrode end image information consists of at least two negative electrode end images, and i is more than or equal to 2;

respectively matching the negative electrode end images in the negative electrode end image information of the m-th group with a preset first template image to determine the scanning area of each negative electrode end image, wherein m is more than or equal to 1;

respectively processing each negative electrode end image to obtain a gray level image;

acquiring gray values of all pixel points in a scanning area determined in each gray image, establishing respective gray value change curves of all gray images, and obtaining edge points of core winding holes on all negative electrode end images according to inflection points of all gray value change curves;

fitting edge points of the core winding holes obtained from the negative electrode end images to form fitting patterns;

calculating to obtain the central coordinate information of the fitting pattern;

and respectively matching each fitting pattern with a preset pattern, judging whether at least one fitting pattern has the similarity with the preset pattern to meet the preset requirement, if so, calculating the central coordinate information of one fitting pattern of the preset requirement, and if not, respectively matching the negative electrode end images in the (m+1) th group of negative electrode end image information with the preset first template image, determining the scanning area of each negative electrode end image and executing the subsequent steps.

Further, when the number of times that the similarity between at least one fitting pattern and the preset pattern meets the preset requirement is judged to be negative, k times are reached, an alarm signal is sent, and k is more than or equal to 2 and less than or equal to i.

Further, the step of obtaining the negative electrode terminal image information of the battery to be welded, and matching the negative electrode terminal image information with a preset first template image, and the step of determining the scanning area further comprises the following steps:

and obtaining model information of the battery to be welded, and matching a preset first template image corresponding to the obtained model information from a template database.

Further, the adjusting the position of the battery to be welded to the position of the winding core hole corresponding to the position of the preset laser beam according to the position information of the winding core hole specifically includes the steps of:

comparing the obtained central coordinate information of the core hole with a preset laser coordinate, and determining the position adjustment information of the battery to be welded;

and adjusting the position of the battery to be welded according to the determined position adjustment information so that the focus of the preset laser beam falls on the axis of the winding core hole.

Further, the step of emitting a laser beam from the negative electrode end of the battery to be welded into the winding core hole, and welding the current collecting disc at the positive electrode end of the battery to be welded through to form a molten pool, so that the current collecting disc at the positive electrode end and the positive electrode post are welded together, and then further comprises the steps of:

and acquiring the image information of the positive electrode end of the welded battery, and matching with a preset second template image to determine whether the welding is abnormal.

The application also discloses a pole welding device, which is applied to the pole welding method and comprises the following steps:

the detection device is used for acquiring the position information of the core winding hole from the negative electrode end of the battery to be welded;

the welding preparation device is electrically connected with the detection device and is used for adjusting the position of the battery to be welded to the position of the core hole corresponding to the position of the preset laser beam according to the position information of the core hole; and

and the laser welding device is electrically connected with the detection device and is used for emitting laser beams from the negative electrode end of the battery to be welded into the winding core hole, and welding the current collecting disc in the positive electrode end of the battery to be welded through to form a molten pool so as to weld the current collecting disc in the positive electrode end with the positive electrode post.

Further, the welding preparation device comprises a welding clamp and a clamp driving mechanism;

the clamp driving mechanism is connected with the welding clamp and used for driving the welding clamp to move;

the welding fixture is used for fixing the battery to be welded.

Further, the welding fixture comprises a fixture bottom plate, a first clamping block, a second clamping block and a clamping block driver;

the clamping block driver is arranged on the clamp bottom plate, connected with the first clamping block and/or the second clamping block and used for driving the first clamping block and/or the second clamping block to move so that the first clamping block and the second clamping block form clamping fixation on the battery to be welded.

Further, the welding fixture further comprises a welding ram and a ram driver;

the pressure head driver is arranged on the clamp bottom plate and connected with the welding pressure head, and is used for driving the welding pressure head to move so as to press the welding pressure head to the negative electrode end of the battery to be welded;

and the welding press head is provided with a welding through hole which is correspondingly communicated with the winding core hole on the battery to be welded.

Further, the laser welding device comprises a laser and a reflecting mechanism;

the reflecting mechanism comprises a mechanism main body and a reflector arranged on the mechanism main body;

the reflector is used for reflecting the laser beam emitted by the laser to the battery to be welded.

Further, the laser welding device also comprises an adjusting mechanism;

the adjusting mechanism is connected with the laser and/or the reflector and is used for driving the laser and/or the reflector to move so as to adjust the laser beam travel emitted by the laser.

Further, the adjusting mechanism is connected with the reflector and is used for adjusting the movement of the reflector;

the adjusting mechanism comprises a first linear adjuster and a second linear adjuster;

the first linear regulator is connected with the reflector and is used for regulating the displacement of the reflector along a preset linear direction;

the second linear regulator is connected with the first linear regulator and is used for regulating the displacement of the reflector along the direction perpendicular to the preset linear direction by driving the first linear regulator to move.

Further, the adjustment mechanism further comprises a rotation adjuster;

the rotation regulator is connected with the reflector and is used for regulating the rotation angle of the reflector;

the first linear regulator is connected with the rotary regulator and is used for regulating the displacement of the reflector along the preset linear direction by driving the rotary regulator to move.

Further, the device also comprises a feeding device;

the welding preparation device is arranged on the feeding device;

the feeding device is used for conveying the battery to be welded on the welding preparation device to a welding station;

the laser welding device is used for welding the battery to be welded on the welding station.

According to the technical scheme, the laser beam enters the battery core from the core winding hole on the negative electrode end of the battery, and the current collecting disc and the positive electrode post are welded, so that the positive electrode post with larger thickness is not required to be welded, a molten pool is formed by only welding through the current collecting disc on the positive electrode end, the current collecting disc and the positive electrode post can be welded together, and the defective rate is reduced. And when welding lines or welding marks appear on the outer surface of the positive pole, the battery can be judged to be defective, compared with the traditional process, the welding line quality, such as the welding line width, the welding line position and the pixel value in the welding line gray level diagram, can be judged, and whether the battery is defective or not can be judged by adopting the mode of the welding method, and the defective test of the battery manufactured by adopting the welding method is simpler and faster, the error rate is lower, and the efficiency is higher.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is an overall flow chart of an embodiment one of a pole welding method provided in the present application;

FIG. 2 is a flowchart of step S1 in a second embodiment of a pole welding method provided in the present application;

FIG. 3 is an overall flow chart of a second embodiment of a pole welding method provided in the present application;

FIG. 4 is a perspective view of a pole welding apparatus provided herein;

FIG. 5 is a perspective view of a welding fixture of the pole welding apparatus provided herein;

FIG. 6 is a perspective view of the adjustment mechanism of the pole welding apparatus provided herein mated with a reflector;

in the figure: 100. a detection device; 200. a laser welding device; 201. a laser; 202. a reflection mechanism; 300. a welding preparation device; 301. welding a clamp; 302. a clamp driving mechanism; 3021. a first clamp displacement driving mechanism; 3022. a second clamp displacement driving mechanism; 11. a first clamping block; 12. a second clamping block; 13. a clamp base plate; 14. a clamp block driver; 21. welding a pressure head; 211. welding the through holes; 22. a ram driver; 221. a lifter; 222. a lateral shifter; 31. a mechanism body; 32. a reflector; 4. an adjusting mechanism; 41. a first linear regulator; 42. a second linear regulator; 43. a rotation adjuster; 431. a fixing plate; 432. a lock nut; 433. and adjusting the stud.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the embodiments of the present application, are within the scope of the embodiments of the present application.

In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, interchangeably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.

The embodiment of the application discloses a pole welding method.

Referring to fig. 1, an embodiment of a method and an apparatus for welding a pole provided in an embodiment of the present application includes:

the steps are as follows:

s1, acquiring position information of a core winding hole from a negative electrode end of a battery to be welded. The battery to be welded can be in a vertical or horizontal posture or other postures, so that the subsequent laser beam can be conveniently injected; taking a vertical posture as an example, the battery to be welded may specifically be in a posture with the negative electrode end facing upward. It should be noted that, the winding core hole, that is, the duct formed in the middle of the battery to be welded after winding, has an opening at the negative electrode end of the battery, so that the position information of the winding core hole can be obtained from the negative electrode end of the battery to be welded.

S2, according to the position information of the winding core hole, adjusting the position of the battery to be welded until the position of the winding core hole corresponds to the position of the preset laser beam. It should be noted that, after the battery is wound and formed, the core hole has a certain error, and the laser beam cannot touch the orifice of the core hole during welding, so after the position information of the core hole is obtained, the position information of the core hole and the preset laser beam can be compared, and the position of the battery to be welded is adjusted according to the obtained comparison result, so that the core hole corresponds to the position of the preset laser beam, and the subsequent laser beam can smoothly enter the core hole.

And S3, emitting laser beams from the negative electrode end of the battery to be welded into the core winding hole, and welding through the current collecting disc in the positive electrode end of the battery to be welded to form a molten pool so that the current collecting disc in the positive electrode end and the positive electrode post are welded together.

According to the pole welding method, laser beams enter the battery core from the core winding hole on the negative electrode end of the battery, and the current collecting disc and the positive pole are welded, so that the positive pole with larger thickness is not required to be welded through, a molten pool is formed by only welding through the current collecting disc on the positive electrode end, the current collecting disc and the positive pole are welded together, and the defective rate is reduced. And when welding lines or welding marks appear on the outer surface of the positive pole, the battery can be judged to be defective, compared with the traditional process, the method can judge whether the battery is defective or not by analyzing the quality of the welding lines, such as the width of the welding lines, the position of the welding lines and the pixel value in a gray level diagram of the welding lines through CCD, and the battery manufactured by adopting the welding method has the advantages of simpler and faster defective test, lower error rate and higher efficiency.

The following is a second embodiment of the method and apparatus for welding a pole, and refer to fig. 2 to 3:

further, the step S1 specifically includes the steps of:

s11, acquiring i groups of negative electrode end image information of a battery to be welded, wherein each group of negative electrode end image information consists of at least two negative electrode end images, and i is more than or equal to 2; i is an integer.

S12, respectively matching the negative electrode end images in the negative electrode end image information of the m-th group with a preset first template image to determine the scanning area of each negative electrode end image, wherein m is more than or equal to 1; m is an integer. The determined scan area is slightly larger than the area of the core hole in the template image area.

S13, respectively processing the negative electrode end images to obtain gray level images.

S14, acquiring gray values of all pixel points in a scanning area determined in each gray image, establishing respective gray value change curves of all gray images, and obtaining edge points of the winding core holes on all negative electrode end images according to inflection points of all gray value change curves; the gray value varies from 0-255.

And S15, fitting edge points of the winding core holes obtained on each negative electrode end image to form a fitting pattern.

S16, respectively matching each fitting pattern with a preset pattern, judging whether at least one fitting pattern and the similarity of the preset pattern meet the preset requirement, if so, calculating the central coordinate information of one fitting pattern meeting the preset requirement, and if not, respectively matching the negative electrode end images in the (m+1) th group of negative electrode end image information with a preset first template image, determining the scanning area of each negative electrode end image and executing the subsequent steps.

It should be noted that, the acquisition of the negative electrode terminal image information is designed to acquire at least two groups of at least two negative electrode terminal images at the same time. And fitting edge points of the core winding holes obtained on each negative electrode end image in the first group to form a fitting pattern according to the preset sequence, comparing the similarity between the fitting pattern and a preset pattern (the preset pattern is a circular pattern), and when judging that the similarity between at least one fitting pattern and the preset pattern meets the preset requirement, considering that the pose of the battery to be welded is normal, if the judging result is negative, misjudgment or abnormal pose (inclined) of the battery to be welded is possible, and continuously obtaining the fitting pattern on the negative electrode end image of the next group, continuously judging, realizing multiple judgment and avoiding the misjudgment condition.

Further, in order to avoid data redundancy caused by multiple judgments, when the number of times that the similarity of at least one fitting pattern and the preset pattern meets the preset requirement is judged to be negative reaches k times, an alarm signal is sent, wherein k is an integer so as to remind operators that the current battery to be welded is abnormal, and k is more than or equal to 2 and less than or equal to i. Taking i as 2 as an example, k may also be 2, and if i is 4, k may be 2 or 3 or 4.

The core hole position information obtained in the step S1 is the core hole center coordinate information/core hole center coordinate obtained in the step S16.

Further, the step S11 further includes the steps of:

s10, obtaining model information of the battery to be welded, and matching a preset first template image corresponding to the obtained model information from a template database. The model information can be obtained by analyzing the current processing information, the model of the battery to be welded which is processed currently is determined according to the model information, and a first template image which is used correspondingly can be found according to the model so as to be convenient for matching and comparison.

Further, the step S2 specifically includes the steps of:

s21, comparing the obtained central coordinate information of the winding core hole with a preset laser coordinate, and determining the position adjustment information of the battery to be welded. The position adjustment information is displacement change parameter information which is needed to be adjusted by the battery to be welded.

S22, adjusting the position of the battery to be welded according to the determined position adjustment information so that the focus of the preset laser beam falls on the axis of the winding core hole.

Further, the step S3 further includes the steps of:

s4, acquiring image information of the positive electrode end of the welded battery, and matching with a preset second template image to determine whether welding is abnormal. Through increasing and setting up this detection judgement step, be convenient for in time handle the defective products to avoid the defective products to flow to subsequent handling.

The foregoing is an embodiment of a pole welding method provided in the embodiments of the present application, and the following is an embodiment of a pole welding apparatus provided in the embodiments of the present application, with particular reference to fig. 4 to 6.

As shown in fig. 4, the present application further discloses a pole welding device, which is applied to the pole welding method, including:

and the detection device 100 is used for acquiring the position information of the winding core hole from the negative electrode end of the battery to be welded. The detection device 100 may be a CCD detector, or other visual detector, without limitation.

The welding preparation device 300 is electrically connected with the detection device 100, and is used for adjusting the position of the battery to be welded to the position of the winding core hole corresponding to the preset laser beam position according to the position information of the winding core hole. and

The laser welding device 200 is electrically connected with the detecting device 100, and is used for emitting a laser beam from the negative electrode end of the battery to be welded into the winding core hole after the position calibration of the battery to be welded is completed, and welding the current collecting disc in the positive electrode end of the battery to be welded through to form a molten pool so that the current collecting disc at the positive electrode end and the positive electrode post are welded together.

It should be noted that, corresponding to the welding method of the second embodiment, the detection device 100 is further specifically configured to obtain i groups of negative electrode end image information of the battery to be welded, where each group of negative electrode end image information is composed of at least two negative electrode end images, and i is greater than or equal to 2; the method comprises the steps of matching negative electrode end images in negative electrode end image information of an mth group with preset first template images respectively to determine scanning areas of the negative electrode end images, wherein m is more than or equal to 1; the method comprises the steps of processing each negative electrode end image to obtain a gray level image; acquiring gray values of all pixel points in a scanning area determined in each gray map, establishing a gray value change curve, and obtaining edge points of the winding core holes on all negative electrode end images according to inflection points of the gray value change curve; fitting edge points of the core winding holes obtained from the negative electrode end images to form fitting patterns; the method comprises the steps of matching each fitting pattern with a preset pattern respectively, judging whether at least one fitting pattern and the similarity of the preset pattern meet preset requirements, if yes, calculating central coordinate information of one fitting pattern meeting the preset requirements, if no, matching negative electrode end images in the negative electrode end image information of the (m+1) th group with preset first template images respectively, determining scanning areas of each negative electrode end image, and executing subsequent steps; and the method is used for sending out an alarm signal when the number of times of judging whether the similarity between at least one fitting pattern and the preset pattern meets the preset requirement reaches k times, wherein k is more than or equal to 2 and less than or equal to i.

It should be noted that, corresponding to the welding method of the second embodiment, the welding preparation device 300 is specifically configured to compare the obtained center coordinate information of the winding core hole with a preset laser coordinate, and determine the position adjustment information of the battery to be welded; and the position of the battery to be welded is adjusted according to the determined position adjustment information, so that the focus of the preset laser beam falls on the axis of the winding core hole.

It should be noted that, corresponding to the welding method of the second embodiment, the present application further includes a testing device (not shown in the figure) configured to obtain the image information of the positive electrode end of the welded battery, and match with a preset second template image to determine whether the welding is abnormal.

Further, as shown in fig. 4, the welding preparing apparatus 300 includes a welding jig 301 and a jig driving mechanism 302, the jig driving mechanism 302 being connected to the welding jig 301 for driving the welding jig 301 to move; the welding jig 301 is used to fix the battery to be welded. The clamp driving mechanism 302 may be a two-axis displacement mechanism, for example, including a first clamp displacement driving mechanism 3021 and a second clamp displacement driving mechanism 3022, where the first clamp displacement driving mechanism 3021 is connected to the welding clamp 301 and is used for driving the welding clamp 301 to move along a first linear direction, the first linear direction may be an X-axis direction, and the second clamp displacement driving mechanism 3022 is connected to the first clamp displacement driving mechanism 3021 and is used for driving the welding clamp 301 to move along a second linear direction perpendicular to the first linear direction, and the second linear direction may be a Y-axis direction, so as to implement two-axis displacement control. The first clamp displacement driving mechanism 3021 and the second clamp displacement driving mechanism 3022 may be screw sliding tables, cylinder sliding tables, or the like, without limitation.

Further, as shown in fig. 5, the welding jig 301 includes a jig base plate 13, a first clamping block 11, a second clamping block 12, and a clamping block driver 14.

The clamping block driver 14 is mounted on the clamp bottom plate 13 and connected with the first clamping block 11 and/or the second clamping block 12, and is used for driving the first clamping block 11 and/or the second clamping block 12 to move so that the first clamping block 11 and the second clamping block 12 form clamping fixation on a battery to be welded. It can be appreciated that at least one of the first clamping block 11 and the second clamping block 12 is a movable clamping block:

taking the first clamping block 11 as a movable clamping block and the second clamping block 12 as a fixed clamping block as an example, the second clamping block 12 is fixedly arranged on the clamp bottom plate 13, and the clamping block driver 14 is connected with the first clamping block 11 and is used for driving the first clamping block 11 to move in a direction close to or far from the second clamping block 12 so as to realize clamping and fixing of the first clamping block 11 and the second clamping block 12 to the battery to be welded.

Taking the first clamping block 11 and the second clamping block 12 as moving clamping blocks, the clamping block driver 14 is respectively connected with the first clamping block 11 and the second clamping block 12 to clamp and fix the battery to be welded by the first clamping block 11 and the second clamping block 12.

Taking the second clamping block 12 as a movable clamping block, taking the first clamping block 11 as a fixed clamping block as an example, the clamping block driver 14 is connected with the second clamping block 12 to drive the second clamping block 12 to move so as to realize clamping and fixing of the first clamping block 11 and the second clamping block 12 to-be-welded battery.

In this application, design first clamp splice 11 into movable clamp splice, and second clamp splice 12 is for deciding the clamp splice, still is equipped with the arc recess on the one side that first clamp splice 11 and second clamp splice 12 are in opposite directions to better treat the welding battery and wrap the clamp, clamp splice driver 14 can be flexible cylinder, does not do specifically and does not do the restriction.

Further, as shown in fig. 5, the welding jig 301 further includes a welding ram 21 and a ram driver 22.

The pressure head driver 22 is installed on the clamp bottom plate 13 and is connected with the welding pressure head 21, and is used for driving the welding pressure head 21 to move so as to press the welding pressure head 21 against the negative electrode end of the battery to be welded, and the welding pressure head is contacted and abutted against the negative electrode end of the battery to be welded so as to further limit the position of the battery to be welded, avoid the position deviation of the battery to be welded during welding and improve the welding precision.

The welding press head 21 is provided with a welding through hole 211 correspondingly communicated with a winding core hole of the battery to be welded, and when the laser welding device 200 performs welding, a laser beam of the welding press head is injected into the winding core hole to weld the current collecting disc and the positive pole post.

Taking the battery to be welded as an example of a vertical setting posture, in terms of the design of the pressure head driver 22, a pressure head lifter 221 may be included to drive the welding pressure head 21 to move up and down, so as to press against the negative end of the battery to be welded. For example, after the welding press head 21 presses against the battery to be welded and the welding through hole 211 is opposite to the winding core hole, the detecting device 100 detects the position information of the winding core hole, adjusts the position of the battery to be welded, and welds.

Of course, the ram driver 22 may further include a ram transverse shifter 222 and a ram longitudinal shifter (not shown), where the ram transverse shifter 222 is connected to the ram lifter 221 to drive the welding ram 21 to move along a horizontal straight line direction by driving the ram lifter 221, and the ram longitudinal shifter is connected to the transverse shifter driver to drive the ram driver 22 to move along another horizontal straight line direction perpendicular to the horizontal straight line direction by driving the transverse shifter driver to move. Taking this as an example, the detection device 100 may first detect, before detection, the ram driver 22 drives the welding ram 21 to move to a position where the detection device 100 is not blocked, after detection, the ram driver 22 adjusts the welding ram 21 to a position where the welding through hole 211 is opposite to the core hole of the battery to be welded according to the detection data, and then drives the welding ram 21 to move downward to contact and abut against the battery to be welded. Meanwhile, the fixture driving mechanism 302 may control the battery to be welded to move to a position corresponding to the position of the winding core hole and the preset laser beam according to the detection data of the detection device 100, and then perform welding.

Further, as shown in fig. 4, since the length of the battery to be welded is generally large, the stroke required for focusing the laser beam is larger, and if the laser 201 is separately provided for the welding operation, the device size of the laser welding apparatus 200 is easily made excessively large. For this purpose, the laser welding device 200 is designed to include a laser 201 and a reflecting mechanism 202.

The reflecting mechanism 202 may be multiple, and may specifically include a mechanism body 31 and a reflector 32 mounted on the mechanism body 31 according to the actual required travel condition, where the reflector 32 is used to reflect the laser beam emitted by the laser 201 onto the battery to be welded. The mechanism main body 31 may be a box structure, which has the functions of mounting, fixing and protecting the reflectors 32, and the number of the reflectors 32 mounted on the mechanism main body 31 may be plural, or may be determined according to the actual required travel condition, without limitation. In this application, reflection mechanism 202 designs into two, keeps flat laser 201, and the laser beam of its transmission is through reflection mechanism 202 reflection, extension laser beam stroke to finally be parallel to the axial direction of waiting to weld the battery and penetrate into the core hole, take waiting to weld the battery to set up for vertical as the example, then finally also just make the laser beam be vertical state and penetrate into waiting to weld the battery.

Further, the laser welding apparatus 200 further includes an adjusting mechanism 4, where the adjusting mechanism 4 is connected to the laser 201 and/or the reflector 32, and is used to drive the laser 201 and/or the reflector 32 to move so as to adjust the stroke of the laser beam emitted by the laser 201. It will be appreciated that at least one of the reflector 32 and the laser 201 is adjustably positioned to adjust the laser beam travel to accommodate different sizes of battery to be welded.

Further, as shown in fig. 6, the adjusting mechanism 4 is connected to the reflector 32, for adjusting the movement of the reflector 32, for example:

the adjustment mechanism 4 may include a first linear adjuster 41 and a second linear adjuster 42.

The first linear regulator 41 is connected to the reflector 32 for regulating the displacement of the reflector 32 in a preset linear direction; the second linear regulator 42 is connected to the first linear regulator 41, and is configured to regulate the displacement of the reflector 32 in a direction perpendicular to the preset linear direction by driving the first linear regulator 41 to move. The first linear adjuster and the second linear adjuster 42 may be micrometer manual fine adjustment platforms, and may integrally form an XY axis micrometer fine adjustment platform, which may specifically refer to an existing micrometer fine adjustment platform, and will not be described in detail.

Further, as shown in fig. 6, the adjusting mechanism 4 further includes a rotation adjuster 43, and the rotation adjuster 43 is connected to the reflector 32 for adjusting the rotation angle of the reflector 32; the first linear regulator 41 is connected to the rotation regulator 43, and is configured to regulate the displacement of the reflector 32 along a preset linear direction by driving the rotation regulator 43 to move. By providing the rotation adjuster 43, the angle of rotation of the reflector 32 can be adjusted to adjust the angle of incidence of the laser beam. Specifically, the reflector 32 may be rotatably mounted on the support platform of the first linear regulator 41, the rotation regulator 43 is also mounted on the support platform of the first linear regulator 41 and connected with the reflector 32, and the rotation regulator 43 may be a manual regulator, for example, including a fixing plate 431, an adjusting stud 433 threaded on the fixing plate 431, and a locking nut 432 in one-to-one correspondence with the adjusting stud 433; the adjusting studs 433 are relatively distributed on two sides of the rotation center line of the reflector 32, and one end penetrating through the fixing plate 431 is hinged to the reflector 32, so that the reflector 32 can be rotated by screwing the adjusting studs 433 located on one side or the other side of the rotation center of the reflector 32, the locking nuts 432 are sleeved on the adjusting studs 433 in a one-to-one correspondence manner and can be contacted and abutted with the fixing plate 431 to lock the adjusting studs 433, and an operation port convenient for operation of an operation tool can be formed at the end part of the adjusting studs 433 without limitation.

Further, the device also comprises a feeding device (not shown in the figure); the welding preparation apparatus 300 is mounted on the feeding apparatus; the feeding device is used for conveying the battery to be welded on the welding preparation device 300 to a welding station; the laser welding device 200 is used for welding the battery to be welded on the welding station.

The feeding device can be a rotary table type feeding device or a linear type feeding device.

Taking a rotary table type feeding device as an example, the rotary table type feeding device can be specifically a polygonal rotary table device. In the conveying mode of the turntable type feeding device, the feeding mode of the battery to be welded can be to feed the battery carriers together. Specifically, a plurality of fixture stations for installing a welding preparation device are arranged on the polygonal turntable, a detection station for installing a detection device and a welding station for installing a laser welding device are sequentially arranged on the periphery of the polygonal turntable, and a manipulator feeding device is arranged. The mechanical feeding device feeds the battery to be welded to a clamp station, and the welding clamp of the welding preparation device on the clamp station positions the battery to be welded; when the polygonal turntable rotates the clamp station to the detection station, the detection device on the detection station can detect the position information of the battery core winding hole, and the clamp driving mechanism on the clamp station adjusts the position of the battery core to be welded in the process that the battery to be welded rotates to the welding station, so that the core winding hole corresponds to the position of the laser beam, and the welding can be completed quickly when the welding station is reached.

Taking a linear feeding device as an example, the welding fixture 301 can be conveyed to a welding station for short stay for welding by a runway type fixture reflow conveying line, so that fixed welding is realized. Of course, the design of flying welding can also be considered under this conveying mode, for example, a conveying line is assembled to the laser welding device 200, so that the laser welding device 200 can be driven to move along with the welding fixture 301, and at this time, only the moving speed of the laser welding device is required to be the same as the moving speed of the welding fixture 301, so that the laser welding device can be relatively stationary, and therefore the flying welding can be realized.

The foregoing describes the pole welding method and apparatus provided in the present application in detail, and those skilled in the art should not understand the present application to limit the scope of the present application according to the concepts of the embodiments of the present application.

Claims

1. The pole welding method is characterized by comprising the following steps:

2. The method for welding a pole according to claim 1, wherein the step of acquiring the positional information of the winding core hole from the negative electrode terminal of the battery to be welded comprises the steps of:

and respectively matching each fitting pattern with a preset pattern, judging whether at least one fitting pattern and the similarity of the preset pattern meet the preset requirement, if so, calculating the central coordinate information of one fitting pattern meeting the preset requirement, and if not, respectively matching the negative electrode end images in the negative electrode end image information of the m+1th group with a preset first template image, determining the scanning area of each negative electrode end image and executing the subsequent steps.

3. The pole welding method according to claim 2, wherein when the number of times of judging whether the similarity between at least one fitting pattern and the preset pattern satisfies the preset requirement is negative reaches k times, an alarm signal is sent out, wherein k is equal to or more than 2 and i is equal to or less than 2.

4. The method for welding a pole according to claim 2, wherein the step of obtaining the negative terminal image information of the battery to be welded, and matching the negative terminal image information with a preset first template image, and the step of determining the scanning area further comprises:

5. The pole welding method according to claim 2, wherein adjusting the position of the battery to be welded to the position of the winding core hole corresponding to the preset laser beam position according to the position information of the winding core hole specifically comprises the steps of:

6. The method of welding a post according to claim 1, wherein the step of emitting a laser beam from the negative electrode end of the battery to be welded into the winding core hole and welding the current collecting disk in the positive electrode end of the battery to be welded through to form a molten pool so that the current collecting disk in the positive electrode end and the post are welded together further comprises the steps of:

7. A pole welding apparatus, characterized by being applied to the pole welding method as claimed in any one of claims 1 to 6, comprising:

the detection device (100) is used for acquiring the position information of the winding core hole from the negative electrode end of the battery to be welded;

the welding preparation device (300) is electrically connected with the detection device (100) and is used for adjusting the position of the battery to be welded to the position of the winding core hole corresponding to the position of the preset laser beam according to the position information of the winding core hole; and

and the laser welding device (200) is electrically connected with the detection device (100) and is used for emitting laser beams from the negative electrode end of the battery to be welded into the winding core hole and welding the current collecting disc in the positive electrode end of the battery to be welded through to form a molten pool so as to weld the current collecting disc in the positive electrode end with the positive electrode post.

8. The pole welding apparatus according to claim 7, wherein the welding preparation device (300) comprises a welding jig (301) and a jig driving mechanism (302);

the clamp driving mechanism (302) is connected with the welding clamp (301) and is used for driving the welding clamp (301) to move;

the welding fixture (301) is used for fixing the battery to be welded.

9. The pole welding apparatus of claim 8, wherein the welding fixture (301) comprises a fixture base plate (13), a first clamping block (11), a second clamping block (12), and a clamping block driver (14);

the clamping block driver (14) is mounted on the clamp bottom plate (13) and connected with the first clamping block (11) and/or the second clamping block (12) and used for driving the first clamping block (11) and/or the second clamping block (12) to move so that the first clamping block (11) and the second clamping block (12) clamp and fix the battery to be welded.

10. The pole welding apparatus of claim 9, wherein the welding fixture (301) further comprises a welding ram (21) and a ram driver (22);

the pressure head driver (22) is arranged on the clamp bottom plate (13) and connected with the welding pressure head (21) and is used for driving the welding pressure head (21) to move so as to press the welding pressure head (21) against the negative electrode end of the battery to be welded;

and the welding pressure head (21) is provided with a welding through hole (211) which is correspondingly communicated with the winding core hole on the battery to be welded.

11. The pole welding apparatus according to claim 7, characterized in that the laser welding device (200) comprises a laser (201) and a reflection mechanism (202);

the reflecting mechanism (202) comprises a mechanism main body (31) and a reflector (32) mounted on the mechanism main body (31);

the reflector (32) is used for reflecting the laser beam emitted by the laser (201) onto the battery to be welded.

12. The pole welding apparatus according to claim 11, characterized in that the laser welding device (200) further comprises an adjustment mechanism (4);

the adjusting mechanism (4) is connected with the laser (201) and/or the reflector (32) and is used for driving the laser (201) and/or the reflector (32) to move so as to adjust the laser beam stroke emitted by the laser (201).

13. The pole welding apparatus according to claim 12, characterized in that the adjustment mechanism (4) is connected with the reflector (32) for adjusting the reflector (32) movement;

the adjusting mechanism (4) comprises a first linear regulator (41) and a second linear regulator (42);

the first linear regulator (41) is connected with the reflector (32) and is used for regulating the displacement of the reflector (32) along a preset linear direction;

the second linear regulator (42) is connected with the first linear regulator (41) and is used for regulating the displacement of the reflector (32) along the direction perpendicular to the preset linear direction by driving the first linear regulator (41) to move.

14. The pole welding apparatus according to claim 13, wherein the adjustment mechanism (4) further comprises a rotation adjuster (43);

the rotation adjuster (43) is connected with the reflector (32) and is used for adjusting the rotation angle of the reflector (32);

the first linear regulator (41) is connected with the rotary regulator (43) and is used for regulating the displacement of the reflector (32) along the preset linear direction by driving the rotary regulator (43) to move.

15. The pole welding apparatus of claim 7, further comprising a feed device;

the welding preparation device (300) is arranged on the feeding device;

the feeding device is used for conveying the battery to be welded on the welding preparation device (300) to a welding station;

the laser welding device (200) is used for welding the battery to be welded on the welding station.