Post Welding Method and Equipment

Abstract

The present application discloses a pole welding method and equipment, which relates to the technical field of battery processing. The welding method includes obtaining the position information of the core hole from the negative electrode end of the battery to be welded; adjusting the position of the battery to be welded according to the position information of the core hole so that the core hole position corresponds to the preset laser beam position; emitting a laser beam into the core hole from the negative electrode end of the battery to be welded, and welding through the current collector plate in the positive electrode end of the battery to form a molten pool, so that the current collector plate of the positive electrode end is welded together with the positive electrode post. Thus, it is possible to weld the current collector plate and the positive electrode post together without welding through the relatively thick positive electrode post, reducing the defective rate. Moreover, when there are weld seams or welding marks on the outer surface of the positive electrode post, it can be determined that the battery is a defective product. Compared with the traditional process design, for the battery manufactured by using the welding method designed in the present application, the defective product test is simpler, faster, with a lower error rate and higher efficiency.

Description

Technical Field

[0001] This application relates to the technical field of battery processing, and particularly to a method and equipment for pole welding. Background Art

[0002] In the prior art, for the welding of the positive pole of a cylindrical battery, most of the time, a laser is used to melt the pole from the outside to form a molten pool, so that the laser can penetrate the pole and weld the current collector plate located inside the pole, and then the pole and the current collector plate are welded together. However, since the thickness of the pole is much larger than that of the current collector plate, the energy density of the laser penetrating the pole is high, and it is difficult to accurately control the power of the laser, resulting in easy penetration of the current collector plate, causing defective products, especially in the welding of the positive pole of large-sized cylindrical batteries. Moreover, when judging defective products by this welding method, it is necessary to perform CCD appearance detection, and then judge the welding quality by judging the weld position, weld width, pixel value, etc. through images. The detection and judgment process is relatively complex, prone to judgment errors, and has low efficiency. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a method and equipment for pole welding, which can reduce the defective product rate, and the judgment of defective batteries after welding is simpler, faster, with a lower error rate and higher efficiency.

[0004] To achieve the above technical purpose, this application provides a method for pole welding, including the steps of:

[0005] Obtain the position information of the core hole from the negative extreme of the battery to be welded;

[0006] According to the position information of the core hole, adjust the position of the battery to be welded so that the core hole position corresponds to the preset laser beam position;

[0007] Emit a laser beam into the core hole from the negative extreme of the battery to be welded, and weld through the current collector plate in the positive extreme of the battery to be welded to form a molten pool, so that the current collector plate in the positive extreme is welded together with the positive pole.

[0008] Further, the step of obtaining the position information of the core hole from the negative extreme of the battery to be welded specifically includes the steps of:

[0009] Obtain the image information of the i groups of negative extremes of the battery to be welded, where each group of negative extreme image information consists of at least two negative extreme images, and i≥2;

[0010] Match the negative extreme images in the negative extreme image information of the mth group with the preset first template image respectively to determine the scanning area of each negative extreme image, and m≥1;

[0011] Process each negative extreme image respectively to obtain a grayscale image;

[0012] Obtain the gray values of each pixel in the determined scanning area of each grayscale image, establish the gray value change curve of each grayscale image respectively, and obtain the edge points of the core hole on each negative extreme image based on the inflection points of each gray value change curve;

[0013] Fit the edge points of the core hole obtained on each negative extreme image to form a fitting pattern;

[0014] And calculate the center coordinate information of the fitting pattern;

[0015] Match each fitting pattern with a preset pattern respectively, and determine whether at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements. If so, calculate the center coordinate information of a fitting pattern that meets the preset requirements. If not, match the negative extreme images in the negative extreme image information of the (m + 1)-th group with a preset first template image respectively, determine the scanning area of each negative extreme image, and execute the subsequent steps.

[0016] Further, when the number of times the result of determining that at least one fitting pattern has a similarity with the preset pattern that does not meet the preset requirements reaches k times, an alarm signal is issued, where 2 ≤ k ≤ i.

[0017] Further, before the step of obtaining the negative extreme image information of the battery to be welded and matching it with a preset first template image to determine the scanning area, the following steps are also included:

[0018] Obtain the model information of the battery to be welded, and match and obtain the preset first template image corresponding to the obtained model information from the template database.

[0019] Further, the step of adjusting the position of the battery to be welded according to the position information of the core hole so that the position of the core hole corresponds to the preset laser beam position specifically includes the following steps:

[0020] Compare the obtained center coordinate information of the core hole with the preset laser coordinates to determine the position adjustment information of the battery to be welded;

[0021] Adjust 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 core hole.

[0022] Further, after the step of emitting a laser beam from the negative extreme of the battery to be welded into the core hole and welding through the current collector plate in the positive extreme of the battery to be welded to form a molten pool so that the current collector plate in the positive extreme is welded to the positive electrode post, the following steps are also included:

[0023] Obtain the positive extreme image information of the welded battery, and match it with a preset second template image to determine whether the welding is abnormal.

[0024] The present application also discloses a pole welding device, which is applied to the above-mentioned pole welding method and includes:

[0025] A detection device for obtaining the position information of the core hole from the negative electrode end of the battery to be welded;

[0026] A welding preparation device, electrically connected to the detection device, for adjusting the position of the battery to be welded according to the position information of the core hole so that the position of the core hole corresponds to the preset laser beam position; and

[0027] A laser welding device, electrically connected to the detection device, for emitting a laser beam into the core hole from the negative electrode end of the battery to be welded and welding through the current collector plate in the positive electrode end of the battery to be welded to form a molten pool, so that the current collector plate at the positive electrode end is welded together with the positive electrode post.

[0028] Further, the welding preparation device includes a welding fixture and a fixture driving mechanism;

[0029] The fixture driving mechanism is connected to the welding fixture for driving the welding fixture to move;

[0030] The welding fixture is used for fixing the battery to be welded.

[0031] Further, the welding fixture includes a fixture bottom plate, a first clamping block, a second clamping block and a clamping block driver;

[0032] The clamping block driver is installed on the fixture bottom plate and is connected to the first clamping block and / or the second clamping block 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 clamp and fix the battery to be welded.

[0033] Further, the welding fixture further includes a welding pressure head and a pressure head driver;

[0034] The pressure head driver is installed on the fixture bottom plate and is connected to the welding pressure head for driving the welding pressure head to move so as to press the welding pressure head against the negative electrode end of the battery to be welded;

[0035] A welding through hole corresponding to and communicating with the core hole on the battery to be welded is provided on the welding pressure head.

[0036] Further, the laser welding device includes a laser and a reflection mechanism;

[0037] The reflection mechanism includes a mechanism main body and a reflector installed on the mechanism main body;

[0038] The reflector is used for reflecting the laser beam emitted by the laser to the battery to be welded.

[0039] Furthermore, the laser welding device further includes an adjusting mechanism;

[0040] The adjusting mechanism is connected to the laser and / or the reflector, and is used to drive the laser and / or the reflector to move, so as to adjust the travel of the laser beam emitted by the laser.

[0041] Furthermore, the adjusting mechanism is connected to the reflector and is used to adjust the movement of the reflector;

[0042] The adjusting mechanism includes a first linear adjuster and a second linear adjuster;

[0043] The first linear adjuster is connected to the reflector and is used to adjust the displacement of the reflector along a preset linear direction;

[0044] The second linear adjuster is connected to the first linear adjuster and is used to drive the first linear adjuster to move, so as to adjust the displacement of the reflector along a direction perpendicular to the preset linear direction.

[0045] Furthermore, the adjusting mechanism further includes a rotary adjuster;

[0046] The rotary adjuster is connected to the reflector and is used to adjust the rotation angle of the reflector;

[0047] The first linear adjuster is connected to the rotary adjuster and is used to drive the rotary adjuster to move, so as to adjust the displacement of the reflector along the preset linear direction.

[0048] Furthermore, a feeding device is further included;

[0049] The welding preparation device is installed on the feeding device;

[0050] The feeding device is used to transport the battery to be welded on the welding preparation device to the welding station;

[0051] The laser welding device is used to weld the battery to be welded at the welding station.

[0052] As can be seen from the above technical solutions, the designed pole welding method of the present application enables the laser beam to enter the battery cell through the winding core hole on the negative electrode end of the battery, and weld the current collector plate and the positive pole, thereby eliminating the need to weld through the relatively thick positive pole. Instead, only the current collector plate at the positive electrode end needs to be welded through to form a molten pool, and then the current collector plate and the positive pole can be welded together, reducing the defective rate. Moreover, when there are weld seams or welding marks on the outer surface of the positive pole, it can be determined that the battery is a defective product. Compared with the traditional process that requires CCD analysis of the weld quality, such as the weld width, weld position, and pixel value size in the weld gray scale image, to determine whether the battery is a defective product, the battery manufactured by the welding method designed in the present application has a simpler and faster defective product test, a lower error rate, and higher efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0054] Figure 1 It is the overall flowchart of the first embodiment of the pole welding method provided in the present application;

[0055] Figure 2 It is the flowchart of the S1 step in the second embodiment of the pole welding method provided in the present application;

[0056] Figure 3 It is the overall flowchart of the second embodiment of the pole welding method provided in the present application;

[0057] Figure 4 It is the three-dimensional view of the pole welding equipment provided in the present application;

[0058] Figure 5 It is the three-dimensional view of the welding fixture of the pole welding equipment provided in the present application;

[0059] Figure 6 It is the three-dimensional view of the cooperation between the adjustment mechanism and the reflector of the pole welding equipment provided in the present application;

[0060] In the figure: 100, detection device; 200, laser welding device; 201, laser; 202, reflection mechanism; 300, welding preparation device; 301, welding fixture; 302, fixture drive mechanism; 3021, first fixture displacement drive mechanism; 3022, second fixture displacement drive mechanism; 11, first clamping block; 12, second clamping block; 13, fixture base plate; 14, clamping block driver; 21, welding head; 211, welding through hole; 22, head driver; 221, lifter; 222, lateral displacer; 31, mechanism main body; 32, reflector; 4, adjustment mechanism; 41, first linear adjuster; 42, second linear adjuster; 43, rotary adjuster; 431, fixing plate; 432, locking nut; 433, adjusting stud. Detailed implementation manners

[0061] Next, the technical solutions of the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the embodiments of the present application.

[0062] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0063] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0064] The embodiments of the present application disclose a pole welding method.

[0065] Please refer to Figure 1 , Embodiment 1 of the pole welding method and equipment provided in the embodiments of the present application includes:

[0066] Steps:

[0067] S1. Obtain the position information of the core hole from the negative electrode end of the battery to be welded. The battery to be welded can be in a vertical, horizontal, or other posture as long as it facilitates the subsequent entry of the laser beam. Taking the vertical posture as an example, the battery to be welded can specifically be in a posture with the negative electrode end facing upward. It should be noted that the core hole is the hole formed in the middle after the battery to be welded is wound, and it has an opening at the negative electrode end of the battery. Therefore, the position information of the core hole can be obtained from the negative electrode end of the battery to be welded.

[0068] S2. According to the position information of the core hole, adjust the position of the battery to be welded so that the position of the core hole corresponds to the preset laser beam position. It should be noted that there will be a certain error in the core hole after the battery is wound. When welding with a laser beam, the laser beam cannot touch the orifice of the core hole. Therefore, after obtaining the position information of the core hole, the position information of the core hole and the preset laser beam can be compared, and the position of the battery to be welded can be adjusted according to the comparison result, so that the position of the core hole corresponds to the preset laser beam, so that the subsequent laser beam can smoothly enter the core hole.

[0069] S3. Emit a laser beam from the negative electrode end of the battery to be welded into the core hole, and weld through the current collector plate in the positive electrode end of the battery to be welded to form a molten pool, so that the current collector plate at the positive electrode end is welded to the positive electrode post.

[0070] The pole welding method designed in this application enables the laser beam to enter the battery core from the core hole at the negative electrode end of the battery, and welds the current collector plate and the positive electrode post. Furthermore, it is not necessary to weld through the relatively thick positive electrode post. Only by welding through the current collector plate at the positive electrode end to form a molten pool can the current collector plate and the positive electrode post be welded together, reducing the defective rate. Moreover, when there are weld seams or welding marks on the outer surface of the positive electrode post, it can be determined that the battery is a defective product. Compared with the traditional process that requires CCD analysis of the weld quality, such as the weld width, weld position, and pixel value size in the weld gray scale image, to determine whether the battery is a defective product, for the battery manufactured by the welding method designed in this application, the defective product test is simpler, faster, with a lower error rate and higher efficiency.

[0071] The above is the content of Embodiment 1 of the pole welding method and equipment. The following is the content of Embodiment 2 of the pole welding method and equipment. Refer to Figures 2 to Figure 3 :

[0072] Further, the S1 step specifically includes the steps:

[0073] S11. Obtain i groups of negative electrode end image information of the battery to be welded, where each group of negative electrode end image information consists of at least two negative electrode end images, and i≥2; i is an integer.

[0074] S12. Match the negative extreme images in the negative extreme image information of the m-th group with a preset first template image respectively to determine the scanning area of each negative extreme image, where m ≥ 1 and m is an integer. The determined scanning area is slightly larger than the area of the core hole in the template image area.

[0075] S13. Process each negative extreme image respectively to obtain a grayscale image.

[0076] S14. Obtain the grayscale values of each pixel point in the determined scanning area of each grayscale image, establish the grayscale value change curve of each grayscale image respectively, and obtain the edge points of the core hole on each negative extreme image based on the inflection points of each grayscale value change curve; the grayscale value changes from 0 to 255.

[0077] S15. Fit the edge points of the core hole obtained on each negative extreme image to form a fitting pattern.

[0078] S16. Match each fitting pattern with a preset pattern respectively, and determine whether at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements. If so, calculate the center coordinate information of one fitting pattern that meets the preset requirements. If not, match the negative extreme images in the negative extreme image information of the (m + 1)-th group with the preset first template image respectively to determine the scanning area of each negative extreme image and execute the subsequent steps.

[0079] It should be noted that the acquisition of the negative extreme image information is designed to acquire at least two groups, and each group is composed of at least two negative extreme images. Then, according to the preset sorting, fit the edge points of the core hole obtained on each negative extreme image in the first group to form a fitting pattern, and then compare the similarity between the fitting pattern and the preset pattern (the preset pattern is a circular pattern). When it is determined that at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements, it can be regarded that the pose of the battery to be welded is normal. If the judgment result is no, there may be a misjudgment or the pose of the battery to be welded is abnormal (tilted). At this time, continue to obtain the fitting pattern on the negative extreme image of the next group and continue to judge, realizing multiple judgments to avoid misjudgment.

[0080] Furthermore, in order to avoid data redundancy caused by multiple judgments, when the number of times the judgment result that at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements is no reaches k times, an alarm signal is sent, where k is an integer, to remind the operator that the battery to be welded currently has an abnormality, 2 ≤ k ≤ i. Taking i as 2, then k can be 2. If i is 4, then k can be 2 or 3 or 4.

[0081] The core hole position information obtained in the above S1 step is also the center coordinate information / center coordinate of the core hole center finally obtained in step S16.

[0082] Further, before step S11, there is also a step:

[0083] S10, obtaining the model information of the battery to be welded, and matching and obtaining the preset first template image corresponding to the obtained model information from the template database. The model information can be parsed from the current processing information. According to the model information, determine the model of the battery to be welded in the current processing, and then the corresponding first template image to be used can be found according to this model for matching and comparison.

[0084] Further, step S2 specifically includes steps:

[0085] S21, comparing the obtained center coordinate information of the core hole with the preset laser coordinate to determine the position adjustment information of the battery to be welded. This position adjustment information is also the displacement change parameter information required for adjusting the battery to be welded.

[0086] 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 core hole.

[0087] Further, after step S3, there is also a step:

[0088] S4, obtaining the positive terminal image information of the battery after welding, and matching it with the preset second template image to determine whether the welding is abnormal. By adding this detection and judgment step, it is convenient to process defective products in time to avoid defective products flowing to subsequent processes.

[0089] The above is the embodiment of the pole welding method provided by this application. The following is the embodiment of the pole welding device provided by this application. For details, please refer to Figures 4 to 6 .

[0090] As Figure 4 shown, this application also discloses a pole welding device, which is applied to the above pole welding method and includes:

[0091] A detection device 100, which is used to obtain the position information of the core hole from the negative terminal of the battery to be welded. This detection device 100 can be a CCD detector or other visual detectors, and there is no specific limitation.

[0092] A welding preparation device 300, which is electrically connected to the detection device 100 and is used to adjust the position of the battery to be welded according to the position information of the core hole so that the position of the core hole corresponds to the position of the preset laser beam. And

[0093] The laser welding device 200, electrically connected to the detection device 100, is configured to emit a laser beam from the negative electrode end of the battery to be welded into the core hole after completing the position calibration of the battery to be welded, and weld through the current collector plate in the positive electrode end of the battery to be welded to form a molten pool, so that the current collector plate in the positive electrode end is welded to the positive electrode post.

[0094] It should be noted that, corresponding to the welding method in the second embodiment above, the detection device 100 of the present application 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 consists of at least two negative electrode end images, and i≥2; to match the negative electrode end images in the mth group of negative electrode end image information with a preset first template image respectively to determine the scanning area of each negative electrode end image, and m≥1; to process each negative electrode end image to obtain a grayscale image; to obtain the grayscale values of each pixel point in the determined scanning area in each grayscale image, establish a grayscale value change curve, and obtain the edge points of the core hole on each negative electrode end image based on the inflection points of the grayscale value change curve; to fit the edge points of the core hole obtained on each negative electrode end image to form a fitting pattern; to match each fitting pattern with a preset pattern respectively to determine whether at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements. If so, calculate the center coordinate information of one fitting pattern that meets the preset requirements. If not, match the negative electrode end images in the (m + 1)th group of negative electrode end image information with the preset first template image respectively to determine the scanning area of each negative electrode end image and perform subsequent steps; and to send an alarm signal when the number of times the result that at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements is judged to be no reaches k times, where 2≤k≤i.

[0095] It should be noted that, corresponding to the welding method in the second embodiment above, the welding preparation device 300 of the present application is specifically configured to compare the obtained center coordinate information of the core hole with a preset laser coordinate to determine the position adjustment information of the battery to be welded; and to adjust 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 core hole.

[0096] It should be noted that, corresponding to the welding method in the second embodiment above, the present application further includes a testing device (not shown in the figure), which is configured to obtain the positive electrode end image information of the battery after welding and match it with a preset second template image to determine whether the welding is abnormal.

[0097] Further, as Figure 4As shown in the figure, the welding preparation device 300 includes a welding fixture 301 and a fixture driving mechanism 302. The fixture driving mechanism 302 is connected to the welding fixture 301 and is used to drive the welding fixture 301 to move. The welding fixture 301 is used to fix the battery to be welded. The fixture driving mechanism 302 can be a two-axis displacement mechanism. For example, it includes a first fixture displacement driving mechanism 3021 and a second fixture displacement driving mechanism 3022. The first fixture displacement driving mechanism 3021 is connected to the welding fixture 301 and is used to drive the welding fixture 301 to move along a first linear direction, which can be the X-axis direction. The second fixture displacement driving mechanism 3022 is connected to the first fixture displacement driving mechanism 3021 and is used to drive the first fixture displacement driving mechanism 3021 to move, so as to drive the welding fixture 301 to move along a second linear direction perpendicular to the first linear direction, which can be the Y-axis direction, thereby realizing two-axis displacement control. The first fixture displacement driving mechanism 3021 and the second fixture displacement driving mechanism 3022 can be a lead screw slide table, a cylinder slide table, etc., without limitation.

[0098] Further, as Figure 5 shown, the welding fixture 301 includes a fixture base plate 13, a first clamping block 11, a second clamping block 12, and a clamping block driver 14.

[0099] The clamping block driver 14 is installed on the fixture base plate 13 and is connected to the first clamping block 11 and / or the second clamping block 12, and is used to drive 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. It can be understood that at least one of the first clamping block 11 and the second clamping block 12 is a movable clamping block:

[0100] Taking the first clamping block 11 as the movable clamping block and the second clamping block 12 as the fixed clamping block as an example, the second clamping block 12 is fixedly installed on the fixture base plate 13, and the clamping block driver 14 is connected to the first clamping block 11 and is used to drive the first clamping block 11 to move in a direction close to or away from the second clamping block 12, so as to realize the clamping and fixing of the battery to be welded by the first clamping block 11 and the second clamping block 12.

[0101] Taking the first clamping block 11 and the second clamping block 12 both as movable clamping blocks as an example, the clamping block driver 14 is respectively connected to the first clamping block 11 and the second clamping block 12, so as to realize the clamping and fixing of the battery to be welded by the first clamping block 11 and the second clamping block 12.

[0102] Taking the second clamping block 12 as the movable clamping block and the first clamping block 11 as the fixed clamping block as an example, the clamping block driver 14 is connected to the second clamping block 12 and drives the second clamping block 12 to move, so as to realize the clamping and fixing of the battery to be welded by the first clamping block 11 and the second clamping block 12.

[0103] In this application, the first clamping block 11 is designed as a movable clamping block, while the second clamping block 12 is a fixed clamping block. An arc-shaped groove is also provided on the opposite surfaces of the first clamping block 11 and the second clamping block 12 to better clamp the battery to be welded. The clamping block driver 14 can be a telescopic cylinder, and there is no specific limitation in this regard.

[0104] Furthermore, as Figure 5 shown, the welding fixture 301 further includes a welding head 21 and a head driver 22.

[0105] The head driver 22 is installed on the fixture base plate 13 and is connected to the welding head 21, and is used to drive the welding head 21 to move, so as to press the welding head 21 against the negative electrode end of the battery to be welded. By contacting and abutting against the negative electrode end of the battery to be welded, the position of the battery to be welded is further restricted to avoid the position deviation of the battery to be welded during welding and improve the welding accuracy.

[0106] A welding through hole 211 corresponding to and communicating with the core hole of the battery to be welded is provided on the welding head 21. When the laser welding device 200 performs welding, its laser beam passes through the welding through hole and enters the core hole to weld the current collector plate and the positive electrode post.

[0107] Taking the battery to be welded in a vertical posture as an example, in terms of the design of the head driver 22, it can include a head lifter 221 to drive the welding head 21 to move up and down, and then press against the negative electrode end of the battery to be welded. Taking this as an example, after the welding head 21 presses against the battery to be welded and the welding through hole 211 is aligned with the core hole, the detection device 100 can then detect the position information of the core hole, and then adjust the position of the battery to be welded, and then perform welding.

[0108] Of course, the head driver 22 can also include a head lateral displacer 222 and a head longitudinal displacer (not shown in the figure). The head lateral displacer 222 is connected to the head lifter 221, and drives the welding head 21 to move along a horizontal straight line direction by driving the head lifter 221. The head longitudinal displacer is connected to the lateral displacement driver, and drives the head driver 22 to move along another horizontal straight line direction perpendicular to a horizontal straight line direction by driving the lateral displacement driver. Taking this as an example, the detection device 100 can first perform detection. Before detection, the head driver 22 first drives the welding head 21 to a position where it does not block the detection device 100. After the detection is completed, the head driver 22 adjusts the welding head 21 to a position where its welding through hole 211 is aligned with the core hole of the battery to be welded according to the detection data, and then drives the welding head 21 to move down to contact and abut against the battery to be welded. At the same time, the fixture drive mechanism 302 can control the movement of the battery to be welded to a position where the core hole corresponds to the preset laser beam position according to the detection data of the detection device 100, and then perform welding.

[0109] Further, as Figure 4 shown, since the length of the battery to be welded is generally large, the travel required for laser beam focusing will be greater. If a laser 201 is set separately for welding operations, it is likely to cause the equipment volume of the laser welding device 200 to be too large. For this reason, the laser welding device 200 of the present application is designed to include a laser 201 and a reflection mechanism 202.

[0110] There can be multiple reflection mechanisms 202, which can be specifically determined according to the actual required travel situation. It includes a mechanism main body 31 and a reflector 32 installed on the mechanism main body 31. 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 can be a box structure, which plays a role in installing, fixing and protecting the reflector 32. There can be multiple reflectors 32 installed on the mechanism main body 31, which can also be specifically determined according to the actual required travel situation, without limitation. In the present application, the reflection mechanism 202 is designed as two. The laser 201 is placed flat, and the laser beam emitted by it is reflected by the reflection mechanism 202 to extend the travel of the laser beam, and finally enters the core hole in the axial direction parallel to the battery to be welded. Taking the battery to be welded as being vertically arranged as an example, then finally the laser beam enters the battery to be welded in a vertical state.

[0111] Further, the laser welding device 200 further includes an adjustment mechanism 4. The adjustment 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 travel of the laser beam emitted by the laser 201. It can be understood that at least one of the reflector 32 and the laser 201 is adjustable, so as to adjust the laser beam travel to adapt to different specifications of the battery to be welded.

[0112] Further, as Figure 6 shown, taking the adjustment mechanism 4 being connected to the reflector 32 and used to adjust the movement of the reflector 32 as an example:

[0113] The adjustment mechanism 4 can include a first linear regulator 41 and a second linear regulator 42.

[0114] The first linear regulator 41 is connected to the reflector 32 and is used to adjust the displacement of the reflector 32 along a preset linear direction; the second linear regulator 42 is connected to the first linear regulator 41 and is used to drive the first linear regulator 41 to move, so as to adjust the displacement of the reflector 32 along a direction perpendicular to the preset linear direction. The first linear regulator and the second linear regulator 42 can both be micrometer manual fine-tuning platforms, and as a whole, they can form a micrometer fine-tuning platform of the XY axis. Specifically, reference can be made to the existing micrometer fine-tuning platforms, and no further elaboration will be made.

[0115] Further, as Figure 6As shown, the adjusting mechanism 4 further includes a rotary adjuster 43. The rotary adjuster 43 is connected to the reflector 32 and is used to adjust the rotation angle of the reflector 32. The first linear adjuster 41 is connected to the rotary adjuster 43 and is used to drive the rotary adjuster 43 to move along a preset linear direction to adjust the displacement of the reflector 32. By providing the rotary adjuster 43, the incident angle of the laser beam can be adjusted by adjusting the rotation angle of the reflector 32. Specifically, the reflector 32 can be rotatably mounted on the support platform of the first linear adjuster 41. The rotary adjuster 43 is also mounted on the support platform of the first linear adjuster 41 and is connected to the reflector 32. The rotary adjuster 43 can be a manual adjuster. For example, it includes a fixing plate 431, an adjusting stud 433 threadedly passing through the fixing plate 431, and a locking nut 432 corresponding to each adjusting stud 433 one by one. The adjusting studs 433 are relatively distributed on both sides of the rotation center line of the reflector 32, and the end passing through the fixing plate 431 is hinged to the reflector 32. In this way, by turning the adjusting stud 433 on one side or the other side of the rotation center of the reflector 32, the reflector 32 can be rotated. The locking nut 432 is threadedly sleeved on the adjusting stud 433 one by one and can contact and abut against the fixing plate 431 to lock the adjusting stud 433. An operation opening convenient for an operation tool to operate can be provided at the end of the adjusting stud 433, without limitation.

[0116] Further, it further includes a feeding device (not shown in the figure); the welding preparation device 300 is installed on the feeding device; the feeding device is used to transport the battery to be welded on the welding preparation device 300 to the welding station; the laser welding device 200 is used to weld the battery to be welded at the welding station.

[0117] The feeding device can be a turntable type feeding device or a linear type feeding device.

[0118] Taking the turntable type feeding device as an example, specifically, it can be a polygonal turntable device. In the conveying mode of the turntable type feeding device, the feeding method of the battery to be welded can be feeding together with the battery carrier. Specifically, a plurality of fixture stations for installing the welding preparation device are provided on the polygonal turntable. A detection station for installing a detection device, a welding station for installing a laser welding device, and a robot feeding device are sequentially arranged on the circumference of the polygonal turntable. The robot feeding device feeds the battery to be welded onto the fixture station, and the welding fixture of the welding preparation device on the fixture station positions the battery to be welded. When the polygonal turntable rotates the fixture station to the detection station, the detection device on the detection station can detect the position information of the battery core hole. During the process of the battery to be welded rotating to the welding station, the fixture driving mechanism on the fixture station adjusts the position of the battery core to be welded so that the core hole corresponds to the position of the laser beam, so as to quickly complete welding when reaching the welding station.

[0119] Taking the adoption of a linear feeding device as an example, it can specifically be a runway-type fixture return conveyor line. After the welding fixture 301 is conveyed to the welding station, it stays briefly for welding to achieve fixed-point welding. Of course, in this conveying method, a flying welding design can also be considered. For example, a conveyor line is assembled for the laser welding device 200, which can drive the laser welding device 200 to move following the welding fixture 301. At this time, as long as the moving speed of the laser welding device is the same as that of the welding fixture 301, relative static can be achieved, thus realizing flying welding.

[0120] The above has introduced in detail the pole welding method and equipment provided by the present application. For those of ordinary skill in the art, according to the idea of the embodiments of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. Pole welding method, characterized in that, Including the steps: Obtain the position information of the core hole from the negative electrode end of the battery to be welded; According to the position information of the core hole, adjust the position of the battery to be welded until the core hole position corresponds to the preset laser beam position; Emit a laser beam from the negative electrode end of the battery to be welded into the core hole, and weld through the current collector plate in the positive electrode end of the battery to form a molten pool, so that the current collector plate of the positive electrode end is welded to the positive electrode post; The step of obtaining the position information of the core hole from the negative electrode end of the battery to be welded specifically includes the steps: Obtain i groups of negative electrode end image information of the battery to be welded, where each group of negative electrode end image information consists of at least two negative electrode end images, and i≥2; Match the negative electrode end images in the mth group of negative electrode end image information with the preset first template image respectively to determine the scanning area of each negative electrode end image, and m≥1; Process each negative electrode end image respectively to obtain a grayscale image; Obtain the grayscale values of each pixel point in the determined scanning area of each grayscale image, establish the grayscale value change curve of each grayscale image respectively, and obtain the edge points of the core hole on each negative electrode end image according to the inflection points of each grayscale value change curve; Fit the edge points of the core hole obtained on each negative electrode end image to form a fitting pattern; Match each fitting pattern with the preset pattern respectively, and judge whether at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements. If so, calculate the center coordinate information of one fitting pattern that meets the preset requirements. If not, match the negative electrode end images in the (m + 1)th group of negative electrode end image information with the preset first template image respectively to determine the scanning area of each negative electrode end image and execute the subsequent steps.

2. The pole welding method according to claim 1, characterized in that, When the number of times that the result of judging that at least one fitting pattern has a similarity with the preset pattern that meets the preset requirements is negative reaches k times, an alarm signal is issued, and 2≤k≤i.

3. The pole welding method according to claim 1, characterized in that Before obtaining the negative electrode end image information of the battery to be welded and matching it with the preset first template image to determine the scanning area, the steps also include: Obtain the model information of the battery to be welded, and match and obtain the preset first template image corresponding to the obtained model information from the template database.

4. The pole welding method according to claim 1, characterized in that The step of adjusting the position of the battery to be welded according to the position information of the core hole until the core hole position corresponds to the preset laser beam position specifically includes the steps: Compare the obtained center coordinate information of the core hole with the preset laser coordinate to determine the position adjustment information of the battery to be welded; Adjust 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 core hole.

5. The pole welding method according to claim 1, characterized in that After emitting a laser beam from the negative electrode end of the battery to be welded into the core hole and welding through the current collector plate in the positive electrode end of the battery to form a molten pool, so that the current collector plate of the positive electrode end is welded to the positive electrode post, the steps also include: Obtain the positive electrode end image information of the welded battery, and match it with the preset second template image to determine whether the welding is abnormal.

6. The pole welding equipment is characterized in that Applied to the pole post welding method according to any one of claims 1-5, including: A detection device (100) for obtaining the position information of the core hole from the negative electrode end of the battery to be welded; A welding preparation device (300), electrically connected to the detection device (100), is configured to adjust the position of the battery to be welded to a position where the core hole corresponds to a preset laser beam position according to the position information of the core hole; and A laser welding device (200), electrically connected to the detection device (100), is configured to emit a laser beam from the negative electrode end of the battery to be welded into the core hole, and weld through the current collector plate in the positive electrode end of the battery to be welded to form a molten pool, so that the current collector plate of the positive electrode end is welded to the positive electrode post together.

7. The pole welding device according to claim 6, characterized in that, The welding preparation device (300) includes a welding fixture (301) and a fixture driving mechanism (302); The fixture driving mechanism (302) is connected to the welding fixture (301) and is configured to drive the welding fixture (301) to move; The welding fixture (301) is configured to fix the battery to be welded.

8. The pole welding device according to claim 7, wherein, The welding fixture (301) includes a fixture bottom plate (13), a first clamping block (11), a second clamping block (12), and a clamping block driver (14); The clamping block driver (14) is installed on the fixture bottom plate (13) and is connected to the first clamping block (11) and / or the second clamping block (12), and is configured to drive 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.

9. The pole welding device according to claim 8, characterized in that The welding fixture (301) further includes a welding head (21) and a head driver (22); The head driver (22) is installed on the fixture bottom plate (13) and is connected to the welding head (21), and is configured to drive the welding head (21) to move, so as to press the welding head (21) against the negative electrode end of the battery to be welded; A welding through hole (211) corresponding to and communicating with the core hole on the battery to be welded is provided on the welding head (21).

10. The pole welding equipment according to claim 6, characterized in that, The laser welding device (200) includes a laser (201) and a reflection mechanism (202); The reflection mechanism (202) includes a mechanism main body (31) and a reflector (32) installed on the mechanism main body (31); The reflector (32) is configured to reflect the laser beam emitted by the laser (201) onto the battery to be welded.

11. The pole welding device according to claim 10, characterized in that, The laser welding device (200) further includes an adjustment mechanism (4); The adjustment mechanism (4) is connected to the laser (201) and / or the reflector (32), and is configured to drive the laser (201) and / or the reflector (32) to move, so as to adjust the travel of the laser beam emitted by the laser (201).

12. The pole welding device according to claim 11, characterized in that, The adjustment mechanism (4) is connected to the reflector (32) and is configured to adjust the movement of the reflector (32); The adjustment mechanism (4) includes a first linear adjuster (41) and a second linear adjuster (42); The first linear adjuster (41) is connected to the reflector (32) and is configured to adjust the displacement of the reflector (32) along a preset linear direction; The second linear regulator (42) is connected to the first linear regulator (41) and is configured to adjust the displacement of the reflector (32) in a direction perpendicular to the preset linear direction by driving the first linear regulator (41) to move.

13. The pole welding device according to claim 12, wherein, The adjusting mechanism (4) further includes a rotary regulator (43); The rotary regulator (43) is connected to the reflector (32) and is configured to adjust the rotation angle of the reflector (32); The first linear regulator (41) is connected to the rotary regulator (43) and is configured to adjust the displacement of the reflector (32) in the preset linear direction by driving the rotary regulator (43) to move.

14. The pole welding device according to claim 6, characterized in that, It further includes a feeding device; The welding preparation device (300) is installed on the feeding device; The feeding device is configured to transport the battery to be welded on the welding preparation device (300) to a welding station; The laser welding device (200) is configured to weld the battery to be welded at the welding station.

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